CN207994946U - The quick discharging circuit of high-voltage switch power supply - Google Patents

Abstract

The utility model discloses a kind of quick discharging circuit of high-voltage switch power supply, which includes switch transformer, filter unit, current drain power switch tube, current drain power resistor, optocoupler and the connection terminal with microprocessor；The second pin of first pin of the first pin connection optocoupler of the connection terminal, the second pin connection optocoupler of connection terminal；And the third pin of optocoupler connects current drain power switch tube by current drain power resistor, the 4th pin of the optocoupler is connect by the 4th resistance with current drain power switch tube；The current drain power switch tube is electrically connected by filter unit with switch transformer.The utility model is not consume energy source power when electricity is gone up or voltage is steady, has achieved the effect that low-carbon environment-friendly.

Description

The quick discharging circuit of high-voltage switch power supply

Technical field

The utility model is related to a kind of repid discharge of switch power technology field more particularly to high-voltage switch power supply electricity Road.

Background technology

In operation, when high-voltage power voltage is turned down, switched power output can only for existing high-voltage switch power supply Voltage is reduced to reach the voltage value of setting by on-chip power load resistance leakage current；Disadvantage：The response that voltage reduces Speed is slow, and built-in leakage current resistance heating directly influences the efficiency of Switching Power Supply.

Invention content

Shortcoming present in view of the above technology, the utility model provide a kind of repid discharge of high-voltage switch power supply Circuit, the circuit are not consume energy source power, and achieved the effect that low-carbon environment-friendly when electricity is gone up or voltage is steady.

To achieve the above object, the utility model provides a kind of quick discharging circuit of high-voltage switch power supply, including switch Transformer, filter unit, current drain power switch tube, current drain power resistor, optocoupler and the connecting pin with microprocessor Son；The second of first pin of the first pin connection optocoupler of the connection terminal, the second pin connection optocoupler of connection terminal Pin；And the third pin of optocoupler connects current drain power switch tube by current drain power resistor, the of the optocoupler Four pins are connect by the 4th resistance with current drain power switch tube；The current drain power switch tube passes through filter unit It is electrically connected with switch transformer.

Wherein, the filter unit includes whole rectifier diode, the first capacitance, the second capacitance, first resistor and the second electricity Resistance；First capacitance is in series with the second capacitance；And first capacitance is connect by rectifier diode with switch transformer, Second capacitance is directly connected to switch transformer, and the first resistor is connected in parallel between the both ends of the first capacitance, and described Two resistance are also connected in parallel between the both ends of the second capacitance.

Wherein, it is connected with zener diode between the third pin and the 4th pin of the optocoupler.

Wherein, the first pin of the connection terminal is connect by current-limiting resistance with optocoupler.

The utility model has the beneficial effects that：Compared with prior art, high-voltage switch power supply provided by the utility model Quick discharging circuit increases quick discharging circuit on original circuit base, when high voltage power supply, which is adjusted, to be increased, connection terminal Port control signal be high level, the 4th foot of output of optocoupler is low level, the cut-off of current drain power switch tube；Work as high pressure When power supply is adjusted to reduce, the port control signal of connection terminal is low level, and the 4th foot of output of optocoupler is high level, power Switching tube current drain power switch tube is connected, and high-tension current flows through current drain power switch tube and the 4th resistance, can make height Voltage source voltage is rapidly reached setting voltage, and when reaching setting voltage, the port control signal of connection terminal is changed into high electricity Flat, circuit repid discharge stops, and coordinates high-voltage switch power supply quickly to reach set voltage value by voltage with this.This circuit is in electricity Go up or when voltage is steady be do not consume can source power, achieved the effect that low-carbon environment-friendly.

Description of the drawings

Fig. 1 is the schematic diagram of the quick discharging circuit of the high-voltage switch power supply of the utility model.

Specific implementation mode

In order to more clearly state the utility model, the utility model is further described below in conjunction with the accompanying drawings.

Referring to Fig. 1, the quick discharging circuit of high-voltage switch power supply provided by the utility model, including switch transformer T1, filter unit, current drain power switch tube Q1, current drain power resistor R3, optocoupler U1 and the connection with microprocessor Terminals P 1；The first pin of the first pin connection optocoupler of the connection terminal, the second pin of connection terminal connect optocoupler Second pin；And the third pin of optocoupler connects current drain power switch tube, the optocoupler by current drain power resistor The 4th pin connect with current drain power switch tube by the 4th resistance；The current drain power switch tube passes through filtering Unit is electrically connected with switch transformer.

Compared to the prior art the case where, the quick discharging circuit of high-voltage switch power supply provided by the utility model, in original To increase quick discharging circuit on circuit base, when high voltage power supply, which is adjusted, to be increased, the port control signal of connection terminal is The 4th foot of output of high level, optocoupler is low level, the cut-off of current drain power switch tube；When high voltage power supply is adjusted to reduce When, the port control signal of connection terminal is low level, and the 4th foot of output of optocoupler is high level, power switch tube current drain Power switch tube is connected, and high-tension current flows through current drain power switch tube and the 4th resistance R4, high-voltage power voltage can be made fast Speed reaches setting voltage, and when reaching setting voltage, the port control signal of connection terminal is changed into high level, and circuit is quickly put Electricity stops, and coordinates high-voltage switch power supply quickly to reach set voltage value by voltage with this.This circuit is gone up or voltage in electricity It is not consume energy source power when steady, has achieved the effect that low-carbon environment-friendly.

In the present embodiment, the filter unit includes whole rectifier diode D1, the first capacitance C1, the second capacitance C2, One resistance R1 and second resistance R2；First capacitance is in series with the second capacitance；And first capacitance passes through two pole of rectification Pipe is connect with switch transformer, and second capacitance is directly connected to switch transformer, and the first resistor is connected in parallel on the first electricity Between the both ends of appearance, the second resistance is also connected in parallel between the both ends of the second capacitance.The third pin of the optocoupler and the 4th Zener diode ZD1 is connected between pin.First pin of the connection terminal is connect by current-limiting resistance R5 with optocoupler.

The explanation of each electronic component of the utility model is specially：T1 is switch transformer；D1 Switching Power Supplies Export rectifier diode；The power supply output filter capacitor of " C1 " " C2 " Switching Power Supply uses series connection side because voltage is higher Formula；" R1 " " R2 " is the equalizing resistance of high-voltage filtering capacitor " C1 " " C2 "；" R3 " is the current drain power resistor of high voltage power supply； The current drain power switch tube of " Q1 " high voltage power supply；" R4 " is that power switch tube " Q1 " provides grid-control voltage；" ZD1 " is Zener diode plays pincers pressure, is used for the grid-control voltage of power limitation switching tube " Q1 " no more than specified control electricity Pressure value；" U1 " is optocoupler, for controlling the switch of power switch tube " Q1 "；" R5 " is the current-limiting resistance that " U1 " is optocoupler；“P1” For connection terminal, MCU control terminals are directly connected to, control signal is sent out to control optocoupler " U1 " by MCU, controls current drain work( Rate switching tube.

Concrete operating principle is：When high-voltage switch power supply works normally, alternating current is rectified by rectifier diode D1 DC pulse current, then the first capacitance C1 in filtered capacitance and the second capacitance C2 be filtered, work as high-voltage switch power supply When needing to turn down voltage, Switching Power Supply turns down duty cycle of switching, reduction output voltage, while Micro-processor MCV by connection terminal The first foot level of P1 is set as low level, and optocoupler U1 is cut-off, and the Q1 grids of power switch tube are that high level is then connected, high pressure Electric current flows through " R3 " power resistor by " Q1 " of power switch tube and returns to high-voltage capacitance, constitutes height and presses discharge loop, to reach Quickly reduction acts on voltage；When high-voltage switch power supply needs that voltage is turned up, duty cycle of switching is turned up in Switching Power Supply, promotes output Voltage, at this time Micro-processor MCV the 1st foot level of terminal " P1 " is set as high level, optocoupler U1 is conducting, current drain work( Rate switching tube Q1 grids be low level then end, no electric current flows through the power resistor R3 that releases at this time, with reach power supply it is quick on The effect risen, this circuit are not consume energy source power, low-carbon environment-friendly when electricity is gone up or voltage is steady.

Disclosed above is only several specific embodiments of the utility model, but the utility model is not limited to this, The changes that any person skilled in the art can think of should all fall into the scope of protection of the utility model.

Claims (4)

1. a kind of quick discharging circuit of high-voltage switch power supply, which is characterized in that including switch transformer, filter unit, electric current It releases power switch tube, current drain power resistor, optocoupler and the connection terminal with microprocessor；The first of the connection terminal The second pin of first pin of pin connection optocoupler, the second pin connection optocoupler of connection terminal；And the third pin of optocoupler Current drain power switch tube is connected by current drain power resistor, the 4th pin of the optocoupler passes through the 4th resistance and electricity It flows and puts power switch tube connection；The current drain power switch tube is electrically connected by filter unit with switch transformer.

2. the quick discharging circuit of high-voltage switch power supply according to claim 1, which is characterized in that the filter unit packet Include rectifier diode, the first capacitance, the second capacitance, first resistor and second resistance；First capacitance is mutually gone here and there with the second capacitance Connection；And first capacitance is connect by rectifier diode with switch transformer, second capacitance is directly connected to switch transformation Device, and the first resistor is connected in parallel between the both ends of the first capacitance, the second resistance is also connected in parallel on the both ends of the second capacitance Between.

3. the quick discharging circuit of high-voltage switch power supply according to claim 1, which is characterized in that the third of the optocoupler It is connected with zener diode between pin and the 4th pin.

4. the quick discharging circuit of high-voltage switch power supply according to claim 1, which is characterized in that the connection terminal First pin is connect by current-limiting resistance with optocoupler.