CN2202371Y

CN2202371Y - Uninterruptible power supply

Info

Publication number: CN2202371Y
Application number: CN 94221488
Authority: CN
Inventors: 张长虹; 陈树友; 魏建新
Original assignee: Zhangjiakou City Tatsu Tatsu Computer Technology Development Department
Current assignee: Zhangjiakou City Tatsu Tatsu Computer Technology Development Department
Priority date: 1994-09-26
Filing date: 1994-09-26
Publication date: 1995-06-28
Anticipated expiration: 2004-09-26

Abstract

The utility model discloses a novel high efficiency UPS uninterrupted power supply which is mainly composed of a clipping circuit, a sine reference signal generating circuit, an inversion voltage stabilizing circuit, and an AC reducing circuit. In the clipping circuit, a reference signal is compared with a superposed signal of commercial power and a battery, and the clipping output is one-way pulsating sine wave. The inversion voltage stabilizing circuit monitors the variation of the clipping output according to the reference signal, and according to different conditions, the inversion circuit is respectively in a monitoring and waiting state, a real-time tracing state and an all inversion state. By adopting the operational mode, the energy of the commercial power can be fully utilized, the converting efficiency can reach 90%-95%, and the utility model has the advantages of stable voltage, stable frequency and no switching time. Besides, the cost and the size of the complete machine are reduced.

Description

Uninterruptible power supply

The utility model relates to the uninterrupted power supply that electronic equipments such as a kind of power supply, particularly computer are used.

In the present prior art, traditional UPS working method has two kinds: online and backup type.

On line type UPS always provides power supply by inverter.And the inverter of off-line UPS always is in backup status, has only when no civil power, and inverter is just started working.On line type UPS since always by inverter to power devices, so just avoided voltage fluctuation that utility grid brings to interference and influence that electronic equipment produced, can accomplish that voltage stabilizing, frequency stabilization power.And with regard to conversion efficiency, on line type UPS belongs to 100% inverting, so loss is big, and conversion efficiency only reaches 65%-75%, and all the other power conversion become heat energy and lose.Off-line UPS all is better than on line type UPS from operational efficiency, noise, price, volume.But, because when civil power was supplied with, civil power was directly sent into equipment, will bring equipment Disturbance in Power Net; When no civil power, off-line UPS is transformed into inversion powered operation state by the mains-supplied operating state, and has switching time, so power supply quality is obviously not as on line type UPS.

Task to be solved in the utility model is to implement a kind of novel, UPS efficiently, and the advantage of backup power and online power supply is rolled into one.

For solving above-mentioned task, the solution that the utility model adopts is: in common UPS, deliver to a clipping circuit simultaneously after civil power and cell voltage are superposeed.In clipping circuit, at first with a reference signal and this superposed signal mutually relatively after, remove interference signal and DC component, slicing is output as pure unidirectional pulsation sine wave, this ripple is sent into the inversion voltage stabilizing circuit.The inversion voltage stabilizing circuit monitors that according to reference signal this ripple changes, if this ripple is identical with unidirectional pulsation sinusoid fiducial signal, then the inversion voltage stabilizing circuit is in the supervision wait state, and this ripple no-reverse change all passes through; When this ripple during less than reference signal, inversion voltage stabilizing circuit real-time tracking is also supplied short waveform; When no civil power, the direct current signal of the whole inversion batteries of inversion voltage stabilizing circuit.Under above-mentioned three kinds of situations, the inversion voltage stabilizing circuit all certain pure unidirectional pulsation sine wave of output amplitude is delivered to exchange and is gone back primary circuit, is reduced into AC sine wave output.

Adopted civil power and cell voltage to send into inverter simultaneously in above-mentioned solution, inverter monitors the clipping circuit variation of output signals according to reference signal, determines whether inversion of inverter in real time.Adopt this scheme to accomplish to make full use of city's electric flux, the purpose of raising the efficiency.The conversion efficiency of this uninterrupted power supply reaches 90%-95%, and cost reduces, volume-diminished.Simultaneously, because inverter is operated under the frequency about 50000HZ, noise is very low.Adopt the technical program, will make that the UPS uninterrupted power supply has reached efficiently, low noise, voltage stabilizing, frequency stabilization, no switching time.

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is the theory diagram of this uninterrupted power supply

Fig. 2 is the circuit theory diagrams of this uninterrupted power supply execution mode

Fig. 3 is in the circuit shown in Figure 2, the voltage waveform that A is ordered

Fig. 4 is in the circuit shown in Figure 2, the voltage waveform of IC1 2 pin

Fig. 5 is in the circuit shown in Figure 2, the voltage waveform of IC1 1 pin

Fig. 6 is in the circuit shown in Figure 2, the voltage waveform that C is ordered

In schematic block circuit diagram shown in Figure 1, the designed uninterrupted power supply of technical scheme of setting forth according to the utility model mainly comprises ac rectifier, clipping circuit, sinusoid fiducial signal generating circuit, inversion voltage stabilizing circuit and exchanges parts such as going back primary circuit.Wherein clipping circuit and inversion voltage stabilizing circuit are key components.

Fig. 2 is the circuit theory diagrams that design by the described schematic block circuit diagram of Fig. 1.Civil power Vin is after bridge rectifier B1 rectification, be output as the interference signal that unidirectional pulsation is sinusoidal wave and be mingled with, after the stack of this voltage wave and cell voltage, deliver to clipping circuit pulse-width modulation transformer T5, waveform Va be contain DC component unidirectional pulsation sine wave as shown in Figure 3.Clipping circuit mainly is made up of pulse-width modulation assembly IC1, transistor BG1, BG2, BG3, BG4, BG5, BG6, pulse transformer T3, T4, T5.The main annexation of clipping circuit is: output 12,14 pin IC1(SG3524) connect the base stage of transistor BG1, BG3 respectively, and BG1 and BG2, BG3 and BG4 form the multiple tube amplifying circuit, their output connects the elementary of pulse amplifier T3, T4 respectively, the secondary base stage that meets composite amplifier BG5, BG6 of T3, T4, after amplifying, it is elementary that output meets pulse transformer T5, in the secondary formation slicing output of T5.In clipping circuit, most crucial device is an IC1 pulse-width modulation assembly, and model is SG3524.Component internal is made up of 5V reference power supply regulator block, saw-toothed oscillator, error operational amplifier, control amplifier and power driving circuit.6 pin connecting resistance R1 of assembly, 7 pin connect capacitor C 1 and finish timing function jointly with the saw-toothed oscillator of component internal, and clipping circuit is operated under the frequency of the 50000HZ left and right sides.The output of clipping circuit, after R2, R3 dividing potential drop, connect 1 pin of SG3524, the unidirectional sinusoid fiducial signal that the sinusoid fiducial signal circuit is sent here, its waveform VR as shown in Figure 4, this voltage wave connect 2 pin of SG3524, and 1,2 pin of SG3524 is inputs of this component internal error operational amplifier after R5, R4 dividing potential drop, by the operation principle of SG3524 assembly as can be known:, just can change the width of the output voltage pulse of this assembly easily as long as change the input voltage of error amplifier.Utilize this characteristic of pulse-width modulation assembly, just can guarantee signal Va through behind the clipping circuit, the output sinusoidal wave VB of pure unidirectional pulsation as shown in Figure 5.Realized that the frequency strictness of clipping circuit output VB follows this characteristic of sinusoid fiducial signal output VR.

The inversion voltage stabilizing circuit is an another key component of the present utility model, and it mainly is made up of pulse-width modulation assembly IC2, transistor BG7, BG8, BG9, BG10, BG11 and pulse transformer T1, T2 etc.The main annexation of inversion voltage stabilizing circuit is: output 12 pin IC2(SG3524) connect the base stage of BG7, the collector electrode of BG7 connects the base stage of compositing amplification tube BG8, BG9, the pulse voltage output of amplifying connects the elementary of pulse transformer T1, the secondary base stage that meets compositing amplification tube BG10, BG11 at T1, the collector electrode of BG10, BG11 connects the elementary of pulse transformer T2, and the secondary output of T2 is sent into and exchanged the input of going back primary circuit.The secondary output VC of T2, waveform as shown in Figure 6.It is through 1 pin of resistance R 6, R7, R8 dividing potential drop feedback access IC2, and 2 pin of IC2 connect the unidirectional sinusoid fiducial signal that the sinusoid fiducial signal circuit is sent here through interlock circuit.In the inversion voltage stabilizing circuit, pulse-width modulation assembly IC2 role is to monitor that all the time inversion output waveform VC changes, if output signal VC is identical with sinusoid fiducial signal VR, then inverter is in the supervision wait state, and the signal no-reverse change is all gone back primary circuit by delivering to exchange; As VC during less than VR, the inverter real-time tracking is also supplied the waveform of shortage; When VC peak value during near cell voltage, just being equivalent to does not have under the civil power situation yet, and the whole inversions of inverter are also supplied whole waveform.So just reached the purpose that improves conversion efficiency.The output VC of inversion voltage stabilizing circuit sends into to exchange and goes back primary circuit, exchanges to go back primary circuit with the sinusoidal wave conducting by turns of unidirectional pulsation, is reduced into AC sine wave, as the output of uninterrupted power supply.

Claims

1, a kind of uninterrupted power supply, mainly by ac rectifier, clipping circuit, sinusoid fiducial signal generating circuit, inversion voltage stabilizing circuit with exchange the reduction circuit and forms, clipping circuit and inversion voltage stabilizing circuit employing pulse width modulation mode is characterized in that:

(A) in the described clipping circuit, a reference signal is compared with the superposed signal of civil power and battery, it is sinusoidal wave that slicing is output as unidirectional pulsation;

(A-1) pulse-width modulation assembly IC[1 in the described clipping circuit] output 12,14 pin meet transistor BG[1 respectively], BG[3] base stage, BG[1] and BG[2], BG[3] and BG[4] form the multiple tube amplifying circuit, their output meets pulse amplifying circuit BG[5 respectively], BG[6] base stage, after amplifying, output meets pulse transformer T[5] elementary, at T[5] secondary formation slicing output;

(B) IC[2 of described inversion voltage stabilizing circuit] output 12 pin meet BG[7] base stage, BG[7] collector electrode meet compositing amplification tube BG[8], BG[9] base stage, the pulse voltage output of amplifying meets pulse transformer T[1] elementary, at T[1] the secondary compositing amplification tube BG[10 that connects], BG[11] base stage, BG[10], BG[11] collector electrode meet pulse transformer T[2] elementary, T[2] secondary output send into and exchange the input go back primary circuit.