CN87216804U - High voltage and large power continuously adjustable power supplying device capable of supplying constant voltage or constant current - Google Patents

Abstract

The utility model discloses a high voltage and large power continuously adjustable direct-current power supplying device capable of supplying constant voltage or constant current. Output voltage is between 0V and 600V, and electric current can be continuously adjusted between 0 A and 5 A. The efficiency of current supply can be over 70 %. The technical indexes of the utility model are in conformity with or above the II stage current supply standard in the SJ-1500-1501-79 standard of electronic industry department. The utility model can be used for the situation with frequent short circuit.

Description

High voltage and large power continuously adjustable power supplying device capable of supplying constant voltage or constant current

The utility model belongs to the current regulator power supply device.

Existing general source of stable pressure, silicon controlled conduction angle on the utilization change power transformer that has is elementary, change the pressure drop of adjusting pipe in the mu balanced circuit, have in the secondary increase tap of power transformer, change secondary voltage, (output voltage can not be adjustable continuously) changes the pressure drop of adjusting pipe in the mu balanced circuit, reduces and adjusts the pipe power consumption.Improve the power utilization rate, protection is simultaneously adjusted pipe and is not damaged.But these source of stable pressure are at the input and output voltage vary within wide limits, or during load short circuits, because the high-voltage filtering capacitor in the rectification circuit, by adjusting tube discharge, often make and adjust pipe and damage.These power supplys particularly are unable to undergo long-term short circuit, so output power is difficult to do greatly, adapt to for these circuit of application scenario (for example high-voltage electrolysis capacitor is seasoned) of some frequent short circuits are very difficult.

The utility model provides a kind of high voltage, the adjustable dc current regulator power supply of high power CW.By rectification circuit, mu balanced circuit, current stabilization circuit, thyristor gating circuit, compositions such as short-circuit protection circuit.Adopt controllable silicon to regulate the primary voltage method; make the voltage drop of adjusting pipe when operate as normal; remain on about 10 volts; transcient short circuit time at mu balanced circuit; adopt the high voltage electricity on the short-circuit protection circuit release filter capacitor; make and adjust the pipe tube voltage drop, and the time is very short, make and adjust pipe and be not damaged at promotion to 47 volt of transcient short circuit time.Therefore output power can be done very greatly, and power-efficient generally can reach more than 70%, adjusts withstand voltage need of pipe and gets final product for 60 volts.The utility model output voltage 0-600 volt, 0～5 ampere of output current, and adjustable continuously.The application scenario that can adapt to frequent short circuit.Its every technical indicator meets or is higher than II level power supply standard in the SJ-1500-1501-79 of the Ministry of Electronics Industry standard.

Accompanying drawing is a high voltage, high power CW is adjustable dc current regulator power supply schematic diagram.

Below in conjunction with accompanying drawing this device is elaborated:

B1, B2 are power transformer in the accompanying drawing, and elementary be connected in series two controllable silicon BG1, the BG2 of B2, B1, B2 parallel connection of primary windings connect.BG3, BG4, BG5 are bridge rectifier circuit, respectively as thyristor gating circuit, and the power supply of current stabilization circuit, mu balanced circuit and short-circuit protection circuit.Mu balanced circuit is by voltage sample circuit (R12, W3), error amplifier (BG21, BG22), voltage-regulating circuit compositions such as (BG10, BG11, BG12), the positive supply of voltage sample circuit is provided through the anode of stabilivolt voltage stabilizing by direct supply (BG4) output of current stabilization circuit, as shown in the figure.BG21 in the error amplifier, base current is provided by mu balanced circuit output plus terminal.Regulator potentiometer W3, sampling voltage is increased or reduce, the electric current of BG22 in the error amplifier is increased or reduce, the tube voltage drop of BG21 increases or reduces, make the output voltage of adjusting pipe (BG12) increase or reduce by voltage-regulating circuit, realize that output voltage is adjustable continuously.

Current stabilization circuit is by resistance R 7, operational amplifier YF1, formations such as potentiometer W2.Connect as shown in the figure.The voltage that electric power outputting current forms on R7 is added to the backward end of YF1, and when a little higher than in-phase end voltage of YF1 backward end voltage, the YF1 output low level siphons away BG10 base stage part electric current, and electric power outputting current is no longer increased, and carries out current stabilization.When YF1 backward end voltage was lower than in-phase end voltage, YF1 exported high level, and electric power outputting current only is subjected to load effect, and power supply is made source of stable pressure and used.Regulator potentiometer W2 changes YF1 in-phase end voltage, can regulate stable output current continuously.

Thyristor gating circuit is by potentiometer W1, resistance R 4, transistor BG14, BG15, BG20, compositions such as transformer B3.The base stage of the preposition amplifier tube BG14 of thyristor gating circuit connects asks poor resistance R 4, ask poor resistance R 4 to be connected with BG14 biasing adjustable potentiometer W1 center tap, adjust pipe (BG12) emitter in the mu balanced circuit and be connected on an end of asking poor resistance R 4, collector is connected on asks the poor resistance other end.Regulate the W1 center tap, the current potential of this change and the tube voltage drop of BG12 ask poor on R4, and this difference is input to the triggering frequency that the BG14 base stage changes thyristor gating circuit, thereby change the primary voltage of B2.By the coupling of B2, change and adjust the pipe tube voltage drop.After W1 set up, when input, output voltage amplitude of variation are very big, or during load short circuits, the voltage of this variation is added in to be adjusted on the pipe.Such as adjustment pipe BG12 tube voltage drop is increased, at this moment, the tube voltage drop of adjusting pipe is added on the resistance R 4 asks poor, and this difference is input to the BG14 base stage lowers the triggering frequency of thyristor gating circuit.Thereby thyristor operating angle is reduced, until shutoff.By the B2 coupling, the tube voltage drop of BG12 reduces.Otherwise the BG12 tube voltage drop is raise.This circuit makes the BG12 tube voltage drop basicly stable about 10 volts, and protection is adjusted pipe and is not damaged, and lowers to adjust the pipe power consumption.Short-circuit protection circuit is made up of resistance R 1 and voltage dependent resistor (VDR) YR1.Resistance R 1 is connected on the positive output end of mu balanced circuit direct supply (BG5) and adjusts between the collector of pipe (BG12), and YR1 is attempted by on the collector and emitter of adjusting pipe (BG12).Increase adjusting tube voltage drop, or during load short circuits, though there are thyristor gating circuit and silicon controlled corrective action that the primary and secondary voltage of transformer B2 is reduced rapidly, or be zero.But this moment; the filter capacitor of BG5 rectification circuit (C3) is by adjusting tube discharge; adjustment pipe tube voltage drop is further raise; adjusting pipe damages easily; but because the effect of YR1; when tube voltage drop rose to 47 volts, YR1 punctured conducting, and the high voltage electricity on the C3 mainly flows through (the C3 discharge process is about 10 milliseconds-20 milliseconds) by YR1 and plays the effect that pipe is adjusted in protection.After electric charge on the C3 has been put substantially, tube voltage drop is recovered normal (about 10 volts), pass through thyristor gating circuit, make controllable silicon keep a very little conduction angle, power supply can be kept long-time short circuit, (still having electric current output this moment), because the transcient short circuit time heavy current impact time is very short, YR1 can not burn out because of big electric current generates heat.Electric current on the resistance R 1 restriction YR1, protection YR1 is not damaged.

Claims (3)

1, a kind of high voltage, high power CW is adjustable dc current regulator power supply device is characterized in that: voltage dependent resistor (VDR) YR1 one terminates at the emitter of adjusting pipe (BG12) in the mu balanced circuit, and the other end is connected on adjusts pipe (BG12) collector.

2, the supply unit of stipulating by claim 1, the collector of adjusting pipe (BG12) is connected on the end of asking poor resistance (R4) on preposition amplifier tube (BG14) base circuit in the thyristor gating circuit, and the emitter of adjusting pipe (BG12) is connected on the other end of asking poor resistance (R4).

3, by the supply unit of claim 1 regulation, connect a resistance (R1) between adjustment pipe (BG12) collector in the anode of rectification circuit (BG5) output and the mu balanced circuit.

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