CN2678229Y

CN2678229Y - Uninterruption power supply

Info

Publication number: CN2678229Y
Application number: CN 200320122305
Authority: CN
Inventors: 金剑杭
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-08
Filing date: 2003-12-08
Publication date: 2005-02-09
Anticipated expiration: 2013-12-08

Abstract

The utility model discloses an uninterrupted power supply which comprises a filter (2), a power factor correction circuit (3) and a control protective circuit (5), wherein the front side of the filter (2) is connected with a relay (1), the rear side of the filter (2) is connected with the power factor correction circuit (3), an energy storage compensating circuit (4) and the control protective circuit (5) in turn. The uninterrupted power supply adopts the contact point of the relay to switch an alternating current power supply and a direct current power supply, and the switching time is compensated by an energy storage capacitor C2; ultimately, the voltage is output in a null interruption mode. The uninterrupted power source has the advantages of stable circuit performance, reliable exchange, high efficiency, simple structure and low cost.

Description

Novel uninterrupted power supply

Technical field:

The utility model relates to a kind of power supply, particularly a kind of uninterrupted power supply.

Background technology:

Because the quality problems of electrical network itself and the effect of various accidentalia, make voltage surge, electromagnetic noise, continuous voltage is higher, continues electrical network bad phenomenon such as low pressure and happens occasionally in transformer station, even the short time power failure also may take place.Also have from the undesirable element of electrical network: supply voltage is instantaneous or sink for a long time, surge and interruption, the drift of supply frequency and shakiness, power supply input wave distortion, various spikes disturb and noise etc., and everything influences for the high-precision responsive instrument and the equipment that can not interrupt is very serious.For example: computer has a power failure when work or has a bigger voltage low, just may cause the consequence that information is washed out and hard disc data is lost on the internal memory.UPS (Uninterruptible Power System), promptly uninterrupted power supply is a kind of energy storage device that contains, and is the uninterrupted power supply of the constant voltage constant frequency of chief component with the inverter.Be mainly used in continual supply of electric power to computer management system, computer network communications system, power automation data acquisition system, automatic control system or other power electronic equipment is provided.When civil power input just often, UPS is supplied to load to use after with the civil power voltage stabilizing, the UPS of this moment is exactly an electric main pressurizer; When civil power interrupted (accident interruption), UPS was immediately with the electric energy of transformer station direct current system, and the method by the inversion conversion continues supply 220V alternating current to load, made load keep operate as normal and protected that load is soft, hardware is not damaged.

Now no matter civil power still is city's electrical anomaly normally to the UPS of usefulness electric power special use, all needs to power to the load through inverter, no switching time, therefore can realize non-stop run.As shown in Figure 1, the online DC ± 380V voltage places that produce through differential mode filter 7 and AC power factor correcting circuit 3 backs that are connected of DC ± 360V of behind the isolated variable of filter 2, pre-voltage stabilizing circuit, DC/DC converter 8, producing of the dc power supply of this UPS.And then through the sinewave inverter in the control protection electric circuit 5 and the sine wave of LC filter 6 filtering outputting high qualities.The DC/DC converter 8 here when mains-supplied just often, it is to be in not energy supply state, not to inverter on the occasion of with the negative value DC power bus (+BUS and-BUS) provide any energy; Yet, in case mains-supplied occurs when unusual, just enter the DC operation state, and be responsible for to inverter provide on the occasion of with negative value DC power bus power supply.The major function of DC/DC converter 8 is DC boosting and buffer action, and its power conversion efficiency maximum is less than 90%, and also about 90%, the overall efficiency when DC operation is about 80% for DC/AC delivery efficiency maximum.In view of such circuit design, for the power tube in the DC/DC converter 8, be in big a lot of of mains-supplied electric current just often when UPS is in electric current that mains-supplied flows through power tube when unusual than UPS, the thing followed is that the power consumption that appears on the power tube also will increase a lot.For these reasons, for UPS equipment, the extra heat that produces will cause the failure rate of complete machine to increase owing to the input of DC/DC converter 8.Because experimental results show that 10 ℃ of the every risings of temperature, the working life of equipment will reduce half.

Summary of the invention:

At the deficiencies in the prior art part, the purpose of this utility model provides a kind of dependable performance, volume is little, in light weight, cost is low, can also increase work efficiency, and prolongs the novel uninterrupted power supply of service life of equipment.

The purpose of this utility model realizes by following proposal: a kind of novel uninterrupted power supply is provided; comprise filter, circuit of power factor correction, control protection electric circuit; before filter, connect relay, behind filter, connect circuit of power factor correction, energy storage compensating circuit, control protection electric circuit successively.

The normally opened contact of relay is connected with the input port of alternating current, and the normally-closed contact of relay is connected with galvanic input port.Circuit of power factor correction comprises filter capacitor C1, the energy storage compensating circuit comprises 1～2 cover compensation along separate routes, every cover compensation comprises resistance R 1, diode D1 along separate routes, and 2, the 2 cover compensation of series connection accumulation capacitor C link together with the form of parallel connection along separate routes after above-mentioned resistance R 1, the diode D1 parallel connection; Civil power just often after the filtering of electric current through filtering capacitor C 1, is leaded up to resistance R 1 to storage capacitor C2 charging, and another road enters control protection electric circuit; Alternating current-direct current is in switching time during outage, and storage capacitor C2 enters control protection electric circuit after diode D1 discharge; After being switched to DC power supply, after the filtering of electric current through filtering capacitor C 1, directly enter control protection electric circuit.

Adopt the novel uninterrupted power supply of said structure, adopt relay contact to switch friendship, straight power supply, compensated by energy storage capacitor C2 its switching time, finally makes voltage output realize zero interruption.Its circuit performance is stable, switches reliably, and under the situation that electrical network breaks down, energy proof load non-stop run has really realized efficiency operation.The utility model is simple in structure, and equipment volume is little, and cost is low, can be widely used in small-power, high power AC uninterrupted power supply and DC UPS.

Description of drawings:

Fig. 1 is the electrical block diagram of existing ac uninterrupted power supply;

Fig. 2 is the small-power of the present utility model (electrical block diagram of 1～3KVA) ac uninterrupted power supply;

Fig. 3 is the high-power (electrical block diagram of 5～15KVA) ac uninterrupted power supplies of the present utility model;

Fig. 4 is the electrical block diagram of DC UPS of the present utility model.

Embodiment:

With reference to above-mentioned accompanying drawing, embodiment of the present utility model is elaborated.

Embodiment 1: Fig. 2 has provided a kind of small-power of the present utility model, and (1～3KVA) ac uninterrupted power supply comprises relay 1, filter 2, differential mode filter 7, circuit of power factor correction 3, the energy storage compensating circuit 4 that is connected in turn, the control protection electric circuit 5 that comprises LC filter 6.The normally opened contact of relay 1 is connected with the input port of alternating current (L, N), the normally-closed contact of relay 1 and galvanic input port (+,-) be connected.Energy storage compensating circuit 4 comprises 2 cover compensation along separate routes; Every cover compensation comprises resistance R 1, diode D1 along separate routes, both back in parallel series connection accumulation capacitor C 2 of above-mentioned R1, D1; 2 cover compensation link together with the form of parallel connection along separate routes.

The course of work is as follows:

One), when civil power just often, the coil J1 of relay 1 gets electric, the normally opened contact closure, normally-closed contact is opened, alternating current AC220V enters relay 1 by L, N port, carries out filtering, the optional 11 subharmonic electric-power filters of filter through filter 2 again; Carry out differential mode filtering through differential mode filter 7 again.Then in circuit of power factor correction 3: be rectified into DC circuit earlier; Then under the control of the power factor correction and the driving protection module that boosts, input power factor is brought up to more than 0.95 from uncompensated 0.65, thereby the input harmonic current component of UPS is dropped in 3%, can avoid in the computer high-speed transfer causing losing of data like this because of the power supply disturbing pulse is excessive; Then carry out filtering by filter capacitor C1.Filtered direct current one tunnel enters energy storage protective circuit 4, and to storage capacitor C2 charging, the capacity of C2 can be according to decision switching time of bearing power and relay by resistance R 1; Another road direct current enters control protection electric circuit 5 simultaneously: modulation enlarges through SPWM (sinusoidal pulse width modulation) earlier, carries out filtering through LC choke-condenser filter 6 again, just can export the AC220V power supply of pure sine wave.

Two), when mains-supplied is out of order or have a power failure fully, relay 1 action: relay coil J1 dead electricity, the normally opened contact of relay disconnects, the normally-closed contact closure.(electric energy of relay alternating current-direct current in switching time is by the storage capacitor C2 compensation of energy storage compensating circuit 4.Detailed process is as follows: when the voltage drop at diode D1 two ends surpasses 0.7V; storage capacitor C2 passes through diode D1 to load discharge; enter control protection electric circuit 5: modulation enlarges through SPWM earlier; carry out filtering through LC choke-condenser filter 6 again; just can export the AC220V power supply of pure sine wave, make switch to DC power supply before output voltage uninterrupted.) power factor compensation circuit 3 of this moment uses as DC voltage booster circuit, original power factor compensation is used as PWM (pulse-width modulation) with SPWM.Direct voltage is boosted ± 365V, carry out filtering by filter capacitor C1.Then directly enter control protection electric circuit 5: modulation enlarges through SPWM, carries out filtering through LC choke-condenser filter 6 again, the AC220V power supply of output pure sine wave.

Embodiment 2, and: Fig. 3 has provided that of the present utility model a kind of high-power (filter 2 directly connects circuit of power factor correction 3 for 5～15KVA) ac uninterrupted power supplies, cancellation differential mode filter 7 and corresponding function thereof, and all the other are with embodiment 1.0～180 ° the sine wave that control protection electric circuit 5 will be imported produces positive direct voltage through power factor compensation circuit 3; 180 °～360 ° the negative sine wave that control protection electric circuit 5 will be imported produces negative direct voltage through power factor compensation circuit 3, and all the other courses of work are with embodiment 1.

Embodiment 3: Fig. 4 has provided a kind of DC UPS of the present utility model, comprises relay 1, filter 2, circuit of power factor correction 3, the energy storage compensating circuit 4 that is connected in turn, the control protection electric circuit 5 that comprises DC/DC converter 8 and LC filter 6.The normally opened contact of relay 1 is connected with the input port of alternating current (L, N), the normally-closed contact of relay 1 and galvanic input port (+,-) be connected.Energy storage compensating circuit 4 comprises resistance R 1, diode D1, above-mentioned both back in parallel series connection accumulation capacitor C 2.

The course of work is as follows:

One), when civil power just often, the coil J1 of relay 1 gets electric, the normally opened contact closure, normally-closed contact is opened, alternating current AC220V enters relay by L, N port, carries out filtering, filter 2 optional 11 subharmonic electric-power filters through filter 2.Then in circuit of power factor correction 3: be rectified into DC circuit by bridge rectifier earlier; Then under the control of the power factor correction and the driving protection module that boosts, input power factor is brought up to more than 0.95 from uncompensated 0.65, thereby the input harmonic current component of UPS is dropped in 3%, can avoid in the computer high-speed transfer causing losing of data like this because of the power supply disturbing pulse is excessive; Then carry out filtering by filter capacitor C1.Filtered direct current one tunnel enters energy storage protective circuit 4, and to storage capacitor C2 charging, the capacity of C2 can be according to decision switching time of bearing power and relay by resistance R 1.Another road direct current enters control protection electric circuit simultaneously: modulation enlarges through PWM (pulse-width modulation) earlier, and the DC/DC converter 8 through high-frequency isolation reduces voltage again, carries out filtering through LC choke-condenser filter 6 then, just can be with galvanic form output.

Two), when mains-supplied is out of order or have a power failure fully, relay 1 action: relay coil J1 dead electricity, the normally opened contact of relay disconnects, the normally-closed contact closure.(electric energy of relay 1 alternating current-direct current in switching time is by the energy storage capacitor C2 compensation of energy storage compensating circuit 4.Detailed process is as follows: when the voltage drop at diode D1 two ends surpasses 0.7V; storage capacitor C2 passes through diode D1 to load discharge; enter control protection electric circuit: modulation enlarges through PWM earlier; DC/DC converter 8 through high-frequency isolation reduces voltage again; carry out filtering through LC choke-condenser filter 6 then, just can be with galvanic form output.) this moment power factor compensation circuit use as DC voltage booster circuit, original power factor compensation is used as PWM with SPWM.Direct voltage is boosted+400V, carry out filtering by filter capacitor C1.Then directly enter control protection electric circuit 5: modulation enlarges through PWM earlier, and the DC/DC converter 8 through high-frequency isolation reduces voltage again, carries out filtering through LC choke-condenser filter 6 then, just can be with galvanic form output.

The above only is several embodiments of the present utility model; should be understood that; for the person of ordinary skill of the art, can also make many modification and improvement, all modification that does not exceed the design's claim or improvement all should be considered as protection range of the present utility model.

Claims

1, a kind of novel uninterrupted power supply; comprise filter (2), circuit of power factor correction (3), control protection electric circuit (5); it is characterized in that:, behind filter (2), connect circuit of power factor correction (3), energy storage compensating circuit (4), control protection electric circuit (5) successively at the preceding connection relay of filter (2) (1).

2, novel uninterrupted power supply according to claim 1 is characterized in that: the normally opened contact of described relay (1) is connected with the input port of alternating current, and the normally-closed contact of relay is connected with galvanic input port.

3, novel uninterrupted power supply according to claim 2 is characterized in that: described circuit of power factor correction (3) comprises filter capacitor C1; Described energy storage compensating circuit (4) comprises 1～2 cover compensation along separate routes, and every cover compensation comprises resistance R 1, diode D1 along separate routes, and 2, the 2 cover compensation of series connection accumulation capacitor C link together with the form of parallel connection along separate routes after above-mentioned resistance R 1, the diode D1 parallel connection; Civil power just often after the filtering of electric current through filtering capacitor C 1, is leaded up to resistance R 1 to storage capacitor C2 charging, and another road enters control protection electric circuit; Alternating current-direct current is in switching time during outage, and storage capacitor C2 enters control protection electric circuit after diode D1 discharge; After being switched to DC power supply, after the filtering of electric current through filtering capacitor C 1, directly enter control protection electric circuit.