CN101668373A - LED light source driving circuit supplied by AC power - Google Patents
LED light source driving circuit supplied by AC power Download PDFInfo
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- CN101668373A CN101668373A CN200910172323A CN200910172323A CN101668373A CN 101668373 A CN101668373 A CN 101668373A CN 200910172323 A CN200910172323 A CN 200910172323A CN 200910172323 A CN200910172323 A CN 200910172323A CN 101668373 A CN101668373 A CN 101668373A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides an LED light source driving circuit which is directly supplied by AC power and can be modularized. The power supply input end of a current regulator is connected with the positive electrode output end of a bridge type rectifying circuit, a connection node for connecting N groups of LEDs is arranged between the output end of the current regulator and the negative electrode output end of the bridge type rectifying circuit, N-1 electronic switches are correspondingly arranged on an LED section lightening control switch circuit, the drain electrodes of all the electronic switches are connected with the negative electrode of the rectifying power supply, and the grid of each electronic switch is respectively connected with the output end of a comparer. The invention solvesthe irreconcilable contradiction between the power utilization rate and LED luminescent efficiency, remarkably prolongs the service life of LED jacklights and power supply modules, and improves powersupply efficiency and energy-saving effect; and LED jacklights which can be directly supplied by AC power, is convenient to popularize and apply in a large scale, and is low in cost and high in efficiency can be assembled and produced on the basis, having profound economic and social benefits.
Description
One, technical field:
The present invention relates to technology of semiconductor illumination application, specifically proposed a kind of can modular AC power the direct led light source drive circuit of power supply.
Two, background technology:
Semiconductor lamp because have the luminous efficiency height, remarkable advantages such as power savings is obvious, the life-span is long, pollution-free, anti-vibration, be subjected to the attention of countries in the world day by day, be expected to replace in the near future traditional various lightings.But this light fixture all adopts the power supply of DC driven power supply usually, must install alternating current is become galvanic constant-current driving power supply in light fixture, although switching regulator constant-current source efficient is higher, utilization of power efficient reduces about 10% when being used for the driving LED light fixture; In addition owing to generally all be lower than 10000 hours the useful life of the electrolytic capacitor of using always in the Switching Power Supply, though the life-span of led light source can reach 5～70,000 hours, after but power circuit damages, light fixture promptly can not use, need purchase new light fixture, form the energy-conservation difficult situation that does not save money of present energy-saving lamp, uneconomical, have a strong impact on it and promote the use of.
In order to address this problem, application number be 200710172585.0 (publication number is CN 101137261A), denomination of invention for " device and the method that are used for driving LED " application for a patent for invention discloses a kind of relatively simple for structure and AC power drive-type LED lamp device that power efficiency is high.To the reference voltage that AC power is carried out voltage of signals (commutating voltage) and regulation after the rectification be compared, flow into according to its comparative result control each LED in led array drive current conducting and end.According to this structure, can make when AC supply voltage is big more that the LED of more number lights, when alternating voltage hour lights the LED of lesser number, can improve the power efficiency of LED lamp device thus.
Fig. 5 lights control method driving LED quantity and LED utilance and power utilization rate graph of a relation for the aforementioned patent applications segmentation, curve display the relation between power-efficient and the LED efficient, 102 is the power-efficient curve, 103 is LED utilance curve, among the figure as can be seen, the quantity of LED is many more, and the efficient of power supply is high more.But the utilance of LED is low more, if quantity one regularly simultaneously, different its efficient of supply voltage are also different, particularly working as at supply voltage is under standard 220 conditions, pressing the LED quantity of power-efficient 95% design, is 190V when lighting at supply voltage, will have partial L ED not work, the efficient of power supply can be reduced to 80% when voltage is 270V, and the power that consumes on the current source will increase by 6～7 times.Fig. 6 is voltage electrical source consumption and current source consumption curve when being changed by 190～260V.104 is electrical source consumption power, and 101 is the current source consumed power.Be expensive LED lamp on the one hand, be the valuable energy on the other hand, improve energy utilization rate, must sacrifice the LED lamp, can't solve the problem of utilization rate of electrical and LED lumination of light emitting diode efficient, adopt Fig. 7-1 in addition, traditional passive continuous current source circuit shown in Fig. 7-2, though its input voltage with can make electric current remain in the setting range substantially by electric current, but when both end voltage is too high, the electric current that flows through also can raise and raise a little with voltage, when supply voltage during by 190V～270V range, average electrical by LED fails to be convened for lack of a quorum and raises with voltage, power consumption on the constant-current source then raises to form doubly with voltage to be increased, and power-efficient descends.
Three, summary of the invention:
The present invention is directed to the prior art deficiency, a kind of LED light source driving circuit supplied by AC power is proposed, quantity and group number by rational voltage regulator circuit and reasonable control LED light-emitting diode, make the Current Control of passing through light-emitting diode in reasonable range, solved power utilization rate and LED lumination of light emitting diode efficient implacable contradiction between the two, and can assemble in view of the above produce that cost is low, efficient is high, long service life, the direct LED illuminating lamp of power supply of AC power of being convenient to large-scale promotion application.
The technical solution adopted in the present invention:
A kind of LED light source driving circuit supplied by AC power, contain bridge rectifier, the control switch circuit is lighted in current regulating circuit and LED segmentation, the bridge rectifier input connects AC power, the power input of current regulator connects the cathode output end of bridge rectifier in the current regulating circuit, be provided with the connected node that is connected N group LED light-emitting diode between the output of current regulator and the cathode output end of bridge rectifier, current regulator just is being connected on rectification circuit with the LED light-emitting diode that is divided into the N group, cathode output end constitutes major loop, wherein N is a natural number, described LED segmentation is lighted control switch circuit correspondence and is provided with N-1 electronic switch, wherein the source electrode of first electronic switch is connected the connected node place of first group of LED light-emitting diode and second group of LED light-emitting diode, the source electrode of second electronic switch is connected the connected node place of second group of LED light-emitting diode and the 3rd group of LED light-emitting diode, the source electrode of N-1 electronic switch is connected the connected node place of N-1 group LED light-emitting diode and N group LED light-emitting diode, the drain electrode of all electronic switches connects the negative pole of rectifier power source, the grid of each electronic switch connects the output of a comparator respectively, and each comparator just, inverting input connects a reference voltage and sampling voltage input signal respectively.Being provided with of described each sampling voltage signal is satisfied: when the output voltage of rectifier power source is not enough to light all LED light-emitting diodes, comparator is according to the voltage signal that detects, drive electronic switch closes successively, with the LED light-emitting diode group of correspondence from the major loop short circuit.
Described LED light source driving circuit supplied by AC power, current regulating circuit comprise the transistor (Q0) as current regulator, inspection leakage resistance (R
10) and comparator (A1), the inspection leakage resistance is located in the major loop of transistor drain side, inspection leakage resistance and transistorized connected node insert the inverting input of comparator (A1), described comparator (A1) import termination in the same way and reference voltage is the output of operational amplifier (A2) circuit of in-phase input end, the output of comparator (A1) connects the transistor controls base stage, the inverting input one tunnel of described operational amplifier (A2) connects the sampled point of current regulating circuit input voltage, another road connects the output of comparator (A3) in the temperature-compensation circuit, is connected with feedback resistance (R between the output of operational amplifier (A2) and the inverting input
11), sampled point one end of current regulating circuit input voltage is by the first sample resistance (R
1) be connected with the power output end of bridge rectifier with voltage-stabiliser tube (WZ1) series connection back, the other end is by the second sample resistance (R
3) connect and examine leakage resistance (R
10) with the connected node of LED lamp.
The output voltage of operational amplifier (A2) is set to: be output as reference voltage when being input to current regulating circuit voltage less than the conducting voltage of DW1, being output as less than reference voltage when being input to current regulating circuit voltage greater than the conducting voltage of DW1; When transistor (Q0) temperature A2 output reference voltage during less than design temperature, A2 output is less than reference voltage during greater than design temperature.
Described LED light source driving circuit supplied by AC power, current regulating circuit comprise the transistor (Q0) as current regulator, inspection leakage resistance (R
10) and comparator (A1), the inspection leakage resistance is located in the major loop of transistor drain side, inspection leakage resistance and transistorized connected node insert the inverting input of comparator (A1), described comparator (A1) import termination in the same way and reference voltage is the output of operational amplifier (A2) circuit of in-phase input end, the output of comparator (A1) connects the transistor controls base stage, and the inverting input of described operational amplifier (A2) is leaded up to coupling resistance (R
21) connect the output of current follower (A4), another road connects the output of comparator (A3) in the temperature-compensation circuit, current follower (A4) in-phase input end connects the sampled point of current regulating circuit input voltage, the inverting input of current follower (A4) connects the sampled voltage output of temperature-compensation circuit, is connected with feedback resistance (R between the output of described operational amplifier (A2) and the inverting input
11), sampled point one end of current regulating circuit input voltage is by the first sample resistance (R
1) be connected with the power output end of bridge rectifier, the other end is by the second sample resistance (R
3) connect and examine leakage resistance (R
10) with the connected node of LED lamp.
Described LED light source driving circuit supplied by AC power, temperature-compensation circuit comprise thermistor RT, described thermistor RT and current-limiting resistance (R
6) the upward power end of termination current regulating circuit of back of connecting, the lower end connects inspection leakage resistance (R
10) with the connected node of transistor (Q0), thermistor RT and current-limiting resistance (R
6) connected node insert comparator (A3) in-phase input end, comparator (A3) inverting input is leaded up to coupling resistance (R
5) be connected with reference voltage, another road is by feedback resistance (R
8) be connected with its output.
When temperature of transistor during less than design temperature, operational amplifier (A2) output reference voltage; When temperature of transistor during greater than design temperature, operational amplifier (A2) is exported less than reference voltage.
Described LED light source driving circuit supplied by AC power, it is 2～9 natural number that the group of the LED light-emitting diode that is connected between the output of current regulator and the cathode output end of bridge rectifier is counted N, according to present technical conditions, when the conducting voltage of each LED light-emitting diode is 3.1～3.3V, the total number M of LED light-emitting diode can be taken as 50～100 natural number, and every group of LED light-emitting diode contains a LED light-emitting diode at least.
And can realize the modularization and the integrated production of LED light source driving circuit supplied by AC power in view of the above, and according to actual conditions, some are bulky or be set to peripheral cell according to resistance, electric capacity that the number needs of LED light-emitting diode will be carried out parameter adjustment, by corresponding pin link block internal circuit.
Useful good effect of the present invention:
1, LED light source driving circuit supplied by AC power of the present invention, adopt rational voltage-regulation current circuit to be connected in the LED lamp major loop, quantity and group number by reasonable control LED light-emitting diode, make the Current Control of passing through light-emitting diode in reasonable range, guaranteed LED light-emitting diode steady-working state, prolong the useful life of illuminating lamp, solved LED lumination of light emitting diode efficient, power utilization rate implacable contradiction between the two, improved the power utilization rate.
2, LED light source driving circuit supplied by AC power of the present invention, power module has only rectification circuit and without electric capacity, particularly not useful life short jumbo electrochemical capacitor, impact to electrical network in the use is disturbed little, simultaneously, voltage regulator circuit has guaranteed can not change with voltage rising and reduction by the electric current of led light source illuminating lamp, is the useful life of having improved LED illuminating lamp and power module greatly therefore, and power source life can be suitable with the useful life of LED light-emitting diode.
3, LED light source driving circuit supplied by AC power of the present invention, the group semiconductor LED luminous tube from first group of semiconductor LED luminous tube to N-1, being equipped with an electronic switch is connected between this group semiconductor LED luminous tube and the described current regulator, it is in parallel to be that the series loop that the semiconductor LED luminous tube forms is organized in electronic switch and its back of every last group of semiconductor LED luminous tube, respectively organize the semiconductor LED luminous tube by the conducting of electronic switch grading control, made full use of the power supply wave shape feature, improved power-efficient, further improved energy-saving effect, it popularizes has far-reaching economic benefit and social benefit.
Four, description of drawings:
Fig. 1: LED light source driving circuit supplied by AC power structural principle schematic diagram of the present invention
Fig. 2: another current regulating circuit of LED light source driving circuit supplied by AC power of the present invention
Fig. 3: the present invention is with 4 groups of LED lamps and 3 groups of execution mode circuit theory diagrams that electronic switch is an example
Fig. 4-1, Fig. 4-2: represented a kind of led light source drive circuit moduleization shown in Figure 3, the application implementation mode after integrated respectively
Fig. 5: adopt the graph of a relation between LED light-emitting diode quantity and LED lumination of light emitting diode efficient under the passive continuous current source situation, the power-efficient
Fig. 6: the graph of a relation when adopting passive continuous current source under the situation of LED light-emitting diode fixed amount in the prior art between its supply voltage and power-efficient, the LED led lighting rate
Fig. 7-1, Fig. 7-2: a kind of circuit theory diagrams that are respectively passive continuous current source
Fig. 8: LED luminous tube quantity is 80, when total conducting voltage is 190V～270V, and led light source drive circuit of the present invention passes through LED current curve comparison diagram with prior art under different voltage conditions
Five, embodiment:
Embodiment one: referring to Fig. 1, LED light source driving circuit supplied by AC power of the present invention, contain bridge rectifier 1, current regulating circuit 2, control switch circuit 4 is lighted in LED light-emitting diode group 3 and LED segmentation, bridge rectifier 1 input connects AC power, the power input of current regulator connects the cathode output end of bridge rectifier 1 in the current regulating circuit 2, be provided with the connected node that is connected N group LED light-emitting diode between the cathode output end of the output of current regulator and bridge rectifier 1, current regulator just is being connected on rectification circuit with the LED light-emitting diode that is divided into the N group, cathode output end constitutes major loop, wherein N is a natural number, described LED segmentation is lighted control switch circuit 4 correspondences and is provided with N-1 electronic switch, wherein the source electrode of first electronic switch is connected the connected node place of first group of LED light-emitting diode and second group of LED light-emitting diode, the source electrode of second electronic switch is connected the connected node place of second group of LED light-emitting diode and the 3rd group of LED light-emitting diode, the source electrode of N-1 electronic switch is connected the connected node place of N-1 group LED light-emitting diode and N group LED light-emitting diode, the drain electrode of all electronic switches connects the negative pole of rectifier power source, the grid of each electronic switch connects the output of a comparator respectively, and each comparator just, inverting input connects a reference voltage and sampling voltage input signal respectively.
Wherein current regulating circuit 2 comprises the transistor Q0 as current regulator, inspection leakage resistance R
10And comparator A1, inspection leakage resistance R
10Be located in the major loop of drain side of transistor Q0 inspection leakage resistance R
10Insert the inverting input of comparator A1 with the connected node of transistor Q0, comparator A1 import termination in the same way and reference voltage is the output of operational amplifier A 2 circuit of in-phase input end, the output of comparator A1 connects the control base stage of transistor Q0, the inverting input one tunnel of operational amplifier A 2 connects the sampled point of current regulating circuit input voltage, another road connects the output of comparator A3 in the temperature-compensation circuit, is connected with feedback resistance R1 between the output of operational amplifier A 2 and the inverting input
1, sampled point one end of current regulating circuit input voltage is by the first sample resistance R
1Be connected with the power output end of bridge rectifier with voltage-stabiliser tube WZ1 series connection back, the other end is by the second sample resistance R
3Connect inspection leakage resistance R
10Connected node with the LED light-emitting diode.
Current-limiting resistance R among Fig. 1
12With voltage-stabiliser tube DW2 and capacitor C
1Constitute the DC control supply in Current Regulation source, resistance R
4, R
9Tie point connect comparator A3 reference voltage input, current-limiting resistance R
13With voltage-stabiliser tube DW3 and capacitor C
3Constitute the DC control supply of voltage cut-out circuit, resistance R
20, R
21Tie point connect voltage comparator B 1, B2, B3 ..., Bn reference voltage.
Embodiment two: referring to Fig. 3.The LED light source driving circuit supplied by AC power of present embodiment, circuit theory be with embodiment one, and what they were different with embodiment one is: adopt 4 groups of LED light-emitting diodes, the segment drive circuit correspondence was provided with 3 groups of electronic switches in voltage-controlled minute.Among the figure, the 220V alternating current is that crest voltage is the pulse direct current of 311V, 100Hz by the bridge rectifier rectification, it plays point voltage is zero, Q1, Q2, three electronic switches of Q3 are opened at this moment, voltage begins to rise by 0, when rising to A group LED lamp conducting voltage, A group LED lamp is bright, and electric current constitutes the loop via bridge rectifier power output end positive pole, A group LED lamp, current regulator Q0, electronic switch Q1, bridge rectifier power output end negative pole; When voltage continues to rise to A group LED lamp and adds the conducting voltage of B group LED lamp, electronic switch Q1 closes, and electric current constitutes the loop via bridge rectifier power output end positive pole, A group LED lamp and B group LED lamp, current regulator Q0, electronic switch Q2, bridge rectifier power output end negative pole; When voltage continues to rise to A and adds B and add the conducting voltage of C group LED lamp, electronic switch Q2 closes, and electric current constitutes the loop via bridge rectifier power output end positive pole, A group, B group and C group LED lamp, current regulator Q0, electronic switch Q3, bridge rectifier power output end negative pole; When voltage continues to rise to the A group and adds the B group and add the C group and add the conducting voltage of D group LED lamp, electronic switch Q3 closes, electric current constitutes the loop to the rectifier bridge cathode output end by the anodal output of rectifier bridge then through A group, B group, C group and D group LED lamp, current regulator Q0, current regulator has guaranteed that the LED lamp passes through the electric current of LED lamp when energising work, under the voltage conditions of regulation, there is different electric currents to pass through, is no more than rated current to guarantee the electric current that LED flows through.When the rectifier bridge output voltage rises to maximum, when beginning to drop to the total conducting voltage of A group, B group, C group and D group LED, electronic switch Q3 opens, when voltage continues to drop to the conducting voltage that A organizes, B organizes and C group LED is total, electronic switch Q2 opens, and when voltage continued to drop to the conducting voltage that A organizes, B group LED is total, electronic switch Q1 opened, only surplus A group lamp is bright, in the power supply one-period, switch work twice, LED lamp energising 2 times, because the cycle is 100HZ, the LED lamp does not have stroboscopic phenomenon.
Embodiment three: referring to Fig. 2, what present embodiment and embodiment one or embodiment two were different is: the concrete current regulating circuit that adopts is slightly different.Current regulating circuit in the present embodiment LED light source driving circuit supplied by AC power comprises the transistor Q0 as current regulator, inspection leakage resistance R
10And comparator A1, the inspection leakage resistance is located in the major loop of transistor drain side, inspection leakage resistance and transistorized connected node insert the inverting input of comparator A1, it is the output of operational amplifier A 2 circuit of in-phase input end that the input in the same way of comparator A1 connects with the reference voltage, the output of comparator A1 connects the transistor controls base stage, and the inverting input of operational amplifier A 2 is leaded up to coupling resistance R
21The output of concatenation operation amplifier A4, another road connects the output of operational amplifier A 3 in the temperature-compensation circuit by R7, operational amplifier A 4 in-phase input ends connect the sampled point of current regulating circuit input voltage, the inverting input of operational amplifier A 4 is connected with reference voltage point by R20, operational amplifier A 4 inverting inputs are connected with output by R2, are connected with feedback resistance R between the output of operational amplifier A 2 and the inverting input
11, sampled point one end of current regulating circuit input voltage is by the first sample resistance R
1Be connected with the power output end of bridge rectifier, the other end is by the second sample resistance R
3Connect inspection leakage resistance R
10Connected node with the LED lamp.
Embodiment four, embodiment five: respectively referring to Fig. 3 and Fig. 4-1, Fig. 4-2, these two embodiment are respectively a kind of the practice mode of led light source drive circuit moduleization shown in Figure 3 after integrated.By circuit shown in Figure 3 from wherein drawing corresponding tie point, Q0 that power consumption is big and inspection leakage resistance R
10Draw the modularizing integrated circuit of producing led light source drive circuit of the present invention as peripheral cell.Integrated circuit shown in Fig. 4-1, additional circuit regulating element Q0 and inspection leakage resistance R
10, the LED light-emitting diode group forms the LED light fixture, regulates R
10The current capacity of the size of resistance and current regulator Q0 can be produced the LED light fixture of different capacity.Integrated circuit shown in Fig. 4-2 is the integrated LED light source drive circuit of more miniaturization, because resistance R
12, R
13, capacitor C
1, C
2Volume is bigger, all adopts external mode and LED light-emitting diode group to form the LED light fixture.
Referring to Fig. 8, for LED light source driving circuit supplied by AC power of the present invention and prior art are 80 in the quantity of LED light-emitting diode, conducting voltage is 190V～during 270V, pass through voltage, the current curve diagram of LED light-emitting diode in half power cycle under different voltage conditions, wherein 105 is voltage curve, 106 for there not to be the passive current source of Current Regulation function to pass through current curve diagram, 107 for the present invention has the current source current curve chart of Current Regulation function, and the electric current that is passed through by current regulator with change in voltage can raise with voltage and reduce.The area 109 that the power that this moment, LED consumed is comprised for 107 curves among the figure, constant substantially with the voltage rising, the power that current regulator Q0 consumes is constant substantially, therefore the last consumed power (caloric value) of current regulator Q0 can not increase with its voltage, thereby guarantees that its power-efficient can not reduce with the voltage rising.And when adopting current source passive shown in Fig. 7-1 or Fig. 7-2, when both end voltage is too high, the electric current that flows through also can raise and raise a little with voltage, but when supply voltage during by 190V～270V range, average electrical by the LED light-emitting diode fails to be convened for lack of a quorum and raises with voltage, the area that the power of LED light-emitting diode consumption this moment is comprised for 106 curves among Fig. 8, when voltage was changed by 190V～270V, the area that 106 curves are comprised raises with voltage to be increased.Power consumption on the constant-current source then raises to form doubly with voltage to be increased, and power-efficient descends.This shows that the area (power-efficient) that curve 107 is comprised among power Fig. 8 of the LED lamp LED light-emitting diode when voltage changes by current regulator control is constant substantially, can realize output-constant operation between 190V～270V.
Claims (6)
1, a kind of LED light source driving circuit supplied by AC power, contain bridge rectifier, the control switch circuit is lighted in current regulating circuit and LED segmentation, the bridge rectifier input connects AC power, the power input of current regulator connects the cathode output end of bridge rectifier in the current regulating circuit, be provided with the connected node that is connected N group LED light-emitting diode between the output of current regulator and the cathode output end of bridge rectifier, current regulator just is being connected on rectification circuit with the LED light-emitting diode that is divided into the N group, cathode output end constitutes major loop, wherein N is a natural number, it is characterized in that: described LED segmentation is lighted control switch circuit correspondence and is provided with N-1 electronic switch, wherein the source electrode of first electronic switch is connected the connected node place of first group of LED light-emitting diode and second group of LED light-emitting diode, the source electrode of second electronic switch is connected the connected node place of second group of LED light-emitting diode and the 3rd group of LED light-emitting diode, the source electrode of N-1 electronic switch is connected the connected node place of N-1 group LED light-emitting diode and N group LED light-emitting diode, the drain electrode of all electronic switches connects the negative pole of rectifier power source, the grid of each electronic switch connects the output of a comparator respectively, and each comparator just, inverting input connects a reference voltage and sampling voltage input signal respectively.
2, LED light source driving circuit supplied by AC power according to claim 1 is characterized in that: described current regulating circuit comprises the transistor (Q0) as current regulator, inspection leakage resistance (R
10) and comparator (A1), the inspection leakage resistance is located in the major loop of transistor drain side, inspection leakage resistance and transistorized connected node insert the inverting input of comparator (A1), described comparator (A1) import termination in the same way and reference voltage is the output of operational amplifier (A2) circuit of in-phase input end, the output of comparator (A1) connects the transistor controls base stage, the inverting input one tunnel of described operational amplifier (A2) connects the sampled point of current regulating circuit input voltage, another road connects the output of comparator (A3) in the temperature-compensation circuit, is connected with feedback resistance (R between the output of operational amplifier (A2) and the inverting input
11), sampled point one end of current regulating circuit input voltage is by the first sample resistance (R
1) be connected with the power output end of bridge rectifier with voltage-stabiliser tube (WZ1) series connection back, the other end connects inspection leakage resistance (R by second sample resistance (R3)
10) with the connected node of transistor (Q0).
3, LED light source driving circuit supplied by AC power according to claim 2 is characterized in that: described temperature-compensation circuit comprises thermistor RT, described thermistor RT and current-limiting resistance (R
6) the upward power end of termination current regulating circuit of back of connecting, the lower end connects inspection leakage resistance (R
10) with the connected node of transistor (Q0), thermistor RT and current-limiting resistance (R
6) connected node insert comparator (A3) in-phase input end, comparator (A3) inverting input is leaded up to coupling resistance (R
5) be connected with reference voltage, another road is by feedback resistance (R
8) be connected with its output.
4, LED light source driving circuit supplied by AC power according to claim 1 is characterized in that: described current regulating circuit comprises the transistor (Q0) as current regulator, inspection leakage resistance (R
10) and comparator (A1), the inspection leakage resistance is located in the major loop of transistor drain side, inspection leakage resistance and transistorized connected node insert the inverting input of comparator (A1), described comparator (A1) import termination in the same way and reference voltage is the output of operational amplifier (A2) circuit of in-phase input end, the output of comparator (A1) connects the transistor controls base stage, and the inverting input of described operational amplifier (A2) is leaded up to coupling resistance (R
21) connect the output of current follower (A4), another road connects the output of comparator (A3) in the temperature-compensation circuit, current follower (A4) in-phase input end connects the sampled point of current regulating circuit input voltage, the inverting input of current follower (A4) connects the sampled voltage output of temperature-compensation circuit, is connected with feedback resistance (R between the output of described operational amplifier (A2) and the inverting input
11), sampled point one end of current regulating circuit input voltage is by the first sample resistance (R
1) be connected with the power output end of bridge rectifier, the other end is by the second sample resistance (R
3) connect and examine leakage resistance (R
10) with the connected node of transistor (Q0).
5, LED light source driving circuit supplied by AC power according to claim 4 is characterized in that: described temperature-compensation circuit comprises thermistor RT, described thermistor RT and current-limiting resistance (R
6) the upward power end of termination current regulating circuit of back of connecting, the lower end connects inspection leakage resistance (R
10) with the connected node of transistor (Q0), thermistor RT and current-limiting resistance (R
6) connected node insert comparator (A3) in-phase input end, comparator (A3) inverting input is leaded up to coupling resistance (R
5) be connected with reference voltage, another road is by feedback resistance (R
8) be connected with its output.
6, according to each described LED light source driving circuit supplied by AC power of claim 1～5, it is characterized in that: the group of the LED light-emitting diode that is connected between the output of current regulator and the cathode output end of bridge rectifier is counted the natural number that N is 2--9, the LED light-emitting diode add up to M, M is the natural number of 40----110, and every group of LED light-emitting diode contains a LED light-emitting diode at least.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910172323A CN101668373A (en) | 2009-09-29 | 2009-09-29 | LED light source driving circuit supplied by AC power |
| CN 201010195126 CN101827481B (en) | 2009-09-29 | 2010-05-22 | Alternating-current power supply LED light source drive circuit with segmented conversion input |
| CN2010202094320U CN201805584U (en) | 2009-09-29 | 2010-05-22 | Piecewise transformation input LED light source driving circuit supplied with power by alternating-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910172323A CN101668373A (en) | 2009-09-29 | 2009-09-29 | LED light source driving circuit supplied by AC power |
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| CN101668373A true CN101668373A (en) | 2010-03-10 |
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| CN200910172323A Pending CN101668373A (en) | 2009-09-29 | 2009-09-29 | LED light source driving circuit supplied by AC power |
| CN2010202094320U Expired - Lifetime CN201805584U (en) | 2009-09-29 | 2010-05-22 | Piecewise transformation input LED light source driving circuit supplied with power by alternating-current power supply |
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|---|---|---|---|
| CN2010202094320U Expired - Lifetime CN201805584U (en) | 2009-09-29 | 2010-05-22 | Piecewise transformation input LED light source driving circuit supplied with power by alternating-current power supply |
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Cited By (49)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101827481A (en) * | 2009-09-29 | 2010-09-08 | 李云霄 | Alternating-current power supply LED light source drive circuit with segmented conversion input |
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