CN203352268U

CN203352268U - Bus capacitor charging/discharging circuit

Info

Publication number: CN203352268U
Application number: CN 201320462540
Authority: CN
Inventors: 何锋
Original assignee: Guangdong East Power Co Ltd
Current assignee: Guangdong East Power Co Ltd
Priority date: 2013-07-31
Filing date: 2013-07-31
Publication date: 2013-12-18
Anticipated expiration: 2023-07-31

Abstract

The utility model relates to a bus capacitor charging/discharging circuit and relates to a capacitor charging/discharging circuit. The bus capacitor charging/discharging circuit comprises a charging loop used for charging a bus capacitor; the charging loop comprises a resistor R1; the resistor R1 and the bus capacitor C1 are connected in series with each other and thereafter are connected between two poles of a charging power source; the charging/discharging circuit further comprises a discharging loop used for performing discharging on the bus capacitor C1; the discharging loop comprises a first controllable switch; and the resistor R1 and the bus capacitor C1 are connected in series with each other and thereafter are connected in parallel with the first controllable switch. The bus capacitor charging/discharging circuit of the utility model is simple in structure, and can completely discharge residual electricity in the bus capacitor after an uninterrupted power supply is switched off, and therefore, safety hidden hazards in the bus capacitor can be eliminated.

Description

A kind of bus capacitance charge-discharge circuit

Technical field

The utility model relates to a kind of capacitor charge and discharge circuit, is specifically related to a kind of bus capacitance charge-discharge circuit.

Background technology

The bus of ups power (uninterrupted power supply) generally is connected to bus capacitance, and bus capacitance plays the effect of energy storage and filtering in the UPS course of work.Include the bus capacitance charging circuit in UPS, for charging to bus capacitance when starting UPS, yet but mostly only has the charging circuit charged to bus capacitance in existing UPS and the discharge circuit do not discharged to bus capacitance after closing UPS, therefore after closing UPS, the electric weight in bus capacitance can only be consumed lentamente by the loss of self, usually the capacitance of bus capacitance is larger, so need the long time could the electric quantity consumption in bus capacitance is complete.UPS quits work in rear bus capacitance and has a large amount of remaining capacities, may hurt the Maintenance and Repair personnel on the one hand, has potential safety hazard, also UPS itself is caused to certain infringement on the other hand.

Summary of the invention

The purpose of this utility model is to provide a kind of bus capacitance charge-discharge circuit with the discharge loop to the bus capacitance electric discharge that can solve potential safety hazard.

For achieving the above object, the utility model provides following technical scheme.

A kind of bus capacitance charge-discharge circuit, comprise for the charge circuit to described bus capacitance charging, described charge circuit comprises resistance R 1, resistance R 1 be connected between the two poles of the earth of charge power supply after bus capacitance C1 connects, this charge-discharge circuit also comprises for the discharge loop to described bus capacitance C1 electric discharge, described discharge loop comprises the first gate-controlled switch, and resistance R 1 is in parallel with the first gate-controlled switch after connecting with bus capacitance C1.

Wherein, described charge circuit also comprises the second gate-controlled switch, the second gate-controlled switch parallel resistance R1.

Wherein, this charge-discharge circuit also comprises control unit, for detection of the electric capacity of bus capacitance C1 and control the first gate-controlled switch and the break-make of the second gate-controlled switch.

Wherein, described the first gate-controlled switch and the second gate-controlled switch are respectively a kind of in relay, circuit breaker, metal-oxide-semiconductor, IGBT.

The beneficial effects of the utility model are: increase a gate-controlled switch on the basis of original charge circuit, when needs discharge to bus capacitance, closed gate-controlled switch makes bus capacitance and resistance formation discharge loop be discharged to bus capacitance, charge-discharge circuit of the present utility model is simple in structure, but the remaining capacity after closing UPS in the emptying bus capacitance, thereby eliminate the potential safety hazard in bus capacitance.

The accompanying drawing explanation

The principle schematic that Fig. 1 is bus capacitance charge-discharge circuit of the present utility model.

The line map that Fig. 2 is a kind of preferred bus capacitance charge-discharge circuit of the present utility model.

Embodiment

Below in conjunction with drawings and Examples, the utility model is elaborated.

Bus capacitance C1 charge-discharge circuit of the present utility model, be applicable to the bus capacitance C1 of UPS, as shown in Figure 1, this charge-discharge circuit comprises for the charge circuit to described bus capacitance C1 charging, described charge circuit comprises resistance R 1, resistance R 1 be connected between the two poles of the earth of charge power supply after bus capacitance C1 connects, because the capacitance of bus capacitance C1 is larger, if do not pass through resistance R 1 while giving bus capacitance C1 charging, and the direct two ends that the two poles of the earth of charge power supply are connected on to bus capacitance C1, it can be the zero huge impulse current that produces due to the initial voltage of bus capacitance C1, huge impulse current not only may blow fuse quits work UPS, even may damage UPS, the resistance R 1 of the metering function of therefore connecting in described charge circuit prevents excessive impulse current UPS is caused damage.Especially, this charge-discharge circuit also comprises that described discharge loop comprises the first gate-controlled switch for the discharge loop to described bus capacitance C1 electric discharge, and resistance R 1 is in parallel with the first gate-controlled switch after connecting with bus capacitance C1; Connect charge power supply and disconnect the first gate-controlled switch charge power supply through resistance R 1 to bus capacitance C1 charging, disconnect charge power supply closed the first gate-controlled switch bus capacitance C1 by resistance R 1 electric discharge.

When giving bus capacitance C1 charging to resistance R 1 of bus capacitance C1 series connection come current limliting with prevented impulse current; can protect like this UPS product and bus capacitance C1; after series resistance R1, the charging rate of bus capacitance C1 has also become slowly simultaneously.Therefore give resistance R 1 gate-controlled switch in parallel, i.e. the second gate-controlled switch, as shown in Figure 1, the second gate-controlled switch is included in charge circuit, the second gate-controlled switch parallel resistance R1, short circuit resistance R 1 while for the voltage giving bus capacitance C1 charging process bus capacitance C1 two ends, reaching the setting limit value, when bus capacitance C1 voltage reaches certain value (setting limit value), make the second gate-controlled switch closure carry out short circuit resistance R 1, select suitable magnitude of voltage size as setting limit value, just can be in the situation that guarantee not there will be excessive impulse current, mode by short circuit resistance R 1 is removed metering function, directly bus capacitance C1 is connected on to the two poles of the earth of charge power supply, thereby accelerate the charging rate of bus capacitance C1.

Particularly, described the first gate-controlled switch and the second gate-controlled switch all can be relay, circuit breaker, metal-oxide-semiconductor, IGBT(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) a kind of in, this charge-discharge circuit also comprises control unit, control unit be used for testbus capacitor C 1 electric capacity and control the first gate-controlled switch and the break-make of the second gate-controlled switch.As shown in Figure 2, in the present embodiment, as preferably, select metal-oxide-semiconductor Q2 to be used as the first gate-controlled switch, select relay J to be used as the second gate-controlled switch, the preferred circuit of the present embodiment is: resistance R 1 and bus capacitance C1 connect, and are connected to the two poles of the earth of charge power supply; Relay J wherein two ends is in parallel with resistance R 1, the external 12V power supply of an end in another two ends, the end of other end contact resistance R2, the other end of resistance R 2 is connected with the collector electrode of triode Q1, triode Q1 grounded emitter, base stage meets the first control end D1 of control unit, after resistance R 3 and capacitor C 2 parallel connections, is connected between the base stage and emitter of triode Q1; Metal-oxide-semiconductor Q2 drain electrode is connected on the contact of resistance R 1 and charge power supply electrode, source electrode is connected on the contact of bus capacitance C1 and charge power supply, grid is connected on the second control end D2 of control unit, after resistance R 4 and capacitor C 3 parallel connections, is connected between the grid and source electrode of metal-oxide-semiconductor Q2.During bus capacitance C1 charging, control end D2 is low level, metal-oxide-semiconductor Q2 disconnects, charge power supply is slowly charged by 1 couple of bus capacitance C1 of resistance R, when the voltage that bus capacitance C1 two ends detected when control unit reaches and sets limit value, control end D1 sends high level and drives triode Q1, allows the relay J adhesive, thereby short circuit resistance R 1, charge to bus capacitance C1 fast; During bus capacitance C1 electric discharge, control end D1 sends low level, and relay J disconnects, control end D2 high level, and metal-oxide-semiconductor Q2 conducting, bus capacitance C1 is by resistance R 1 electric discharge.

Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not to the restriction of the utility model protection range; although with reference to preferred embodiment, the utility model has been done to explain; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not break away from essence and the scope of technical solutions of the utility model.

Claims

1. a bus capacitance charge-discharge circuit, comprise for the charge circuit to described bus capacitance charging, described charge circuit comprises resistance R 1, resistance R 1 be connected between the two poles of the earth of charge power supply after bus capacitance C1 connects, it is characterized in that: this charge-discharge circuit also comprises for the discharge loop to described bus capacitance C1 electric discharge, described discharge loop comprises the first gate-controlled switch, and resistance R 1 is in parallel with the first gate-controlled switch after connecting with bus capacitance C1.

2. a kind of bus capacitance charge-discharge circuit according to claim 1, it is characterized in that: described charge circuit also comprises the second gate-controlled switch, the second gate-controlled switch parallel resistance R1.

3. a kind of bus capacitance charge-discharge circuit according to claim 2, it is characterized in that: this charge-discharge circuit also comprises control unit, for detection of the electric capacity of bus capacitance C1 and control the first gate-controlled switch and the break-make of the second gate-controlled switch.

4. a kind of bus capacitance charge-discharge circuit according to claim 2 is characterized in that: described the first gate-controlled switch and the second gate-controlled switch are respectively a kind of in relay, circuit breaker, metal-oxide-semiconductor, IGBT.