AC-DC (alternating current-direct current) drive output filter capacitor quick active leakage circuit

An output filtering and bleeder circuit technology, applied in the field of electronics, can solve the problems of aggravating the internal temperature rise of the driving power supply, low reliability and practicability, and affecting the efficiency of the power supply, so as to achieve low power consumption, prevent overcurrent damage and discharge. Current controllable effect

Inactive Publication Date: 2015-07-01
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to shorten the discharge time of the output capacitor after power failure, the traditional technology connects a dummy load resistor to the output of the AC-DC converter, but the effect is very limited, because the dummy load resistor cannot be too small, otherwise it will seriously affect the efficiency of the power supply, and it will also Exacerbate the temperature rise inside the drive power supply
[0004] In the prio

Method used

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  • AC-DC (alternating current-direct current) drive output filter capacitor quick active leakage circuit
  • AC-DC (alternating current-direct current) drive output filter capacitor quick active leakage circuit
  • AC-DC (alternating current-direct current) drive output filter capacitor quick active leakage circuit

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Embodiment 1

[0033] see figure 1 , is a schematic block diagram of an AC-DC driver output filter capacitor fast active discharge circuit provided by the present invention.

[0034] The AC-DC driver output filter capacitor fast active discharge circuit includes: output filter capacitor terminal voltage detection circuit 10, switch SW drive circuit 11, switch SW13 and low resistance load resistor RL12, the positive terminal of the fast active discharge circuit VCC is connected to the positive pole of the output filter capacitor 2 of the AC-DC converter, the negative terminal GND of the fast active discharge circuit is connected to the negative pole of the output filter capacitor 2 of the AC-DC converter, the low-impedance load resistor RL12 is connected in series with the switch SW13, and the load resistor One end of R12L is connected to the positive terminal VCC of the fast active discharge circuit, the other end is connected to the switch SW13, and the other end of the switch SW13 is conne...

Embodiment 2

[0039] For the convenience of the selection of the discharge voltage, in the second implementation of the AC-DC driver output filter capacitor fast active discharge circuit of the present invention, as image 3 As shown, two zener diodes D11 and D12 in series in the same direction are used to form the discharge voltage detection element, that is, the zener diode D1 in the first embodiment is replaced by two zener diodes D11 and D12 in series in the same direction. Other structures of the second embodiment are the same as those of the first embodiment, and will not be repeated here.

Embodiment 3

[0041] Such as Figure 4 As shown, on the basis of Embodiment 2, considering that the current amplification factor β of the single power NPN transistor Q2 is limited, use NPN transistors Q21 and Q22 to form a composite tube with a high current amplification factor instead of the single power NPN transistor Q2 as the switch SW12, To increase the current amplification factor β of the switch SW, so as to further increase the resistance value of the collector load resistor R3 and the current limiting resistor R1, and further reduce the power consumption of the active discharge circuit, wherein the collectors of the NPN transistors Q21 and Q22 and connected together, and connected to one end of the load resistor RL12, the emitter of the NPN transistor Q21 is connected to the base of the NPN transistor Q22. In addition, a resistor R5 is introduced into the switch SW13, one end of the resistor R5 is connected to the emitter of the NPN transistor Q21 and the base of the NPN transistor...

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Abstract

The invention discloses an AC-DC (alternating current-direct current) drive output filter capacitor quick active leakage circuit which comprises an output filter capacitor-side voltage detection circuit, a switch SW drive circuit, a switch SW and a low resistance load resistance RL, the switch SW drive circuit force the switch SW to be switched off when AC-DC convertor output filter capacitor-side voltage sensed by the output filter capacitor-side voltage detection circuit is larger than leakage voltage, and weak current flows through low resistance load RL; the switch SW drive circuit is in state overturn to force the switch SW to be switched when the AC-DC convertor output filter capacitor-side voltage sensed by the output filter capacitor-side voltage detection circuit is smaller than the set leakage voltage, and an output filter capacitor is enabled to discharge rapidly by the aid of the low resistance load RL. The AC-DC drive output filter capacitor quick active leakage circuit is quick in discharge, delayed start-up circuits are reset rapidly after power outage, discharge current is controlled to the greatest extent, and over-current damage to the switch SW is avoided; power consumption is lowered, and under the normal state, the discharge current can be integrally controlled under 100mW in power consumption.

Description

technical field [0001] The invention relates to the field of electronic technology, relates to an AC-DC driver, in particular to a fast active discharge circuit for an output filter capacitor of the AC-DC driver. Background technique [0002] In the AC-DC drive circuit, in order to obtain a stable DC voltage, it is inevitable to use a large-capacity capacitor as a low-voltage output filter capacitor in the high-frequency rectification filter circuit on the secondary side of the AC-DC converter. When the AC-DC driver is connected to a resistive load, the energy stored in the output filter capacitor will be quickly released by the resistive load after the mains is disconnected, and the voltage at the output filter capacitor terminal will also drop immediately, making the soft-start circuit in the AC-DC converter reliable. Reset, to ensure that there will be no instantaneous overvoltage at the output end when the power is turned on again. However, when the AC-DC driver is conn...

Claims

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Application Information

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IPC IPC(8): H02M1/32H05B37/02
CPCH02M1/32H05B47/10H02M1/322
Inventor 潘永雄黄明旭林杰辉孙安全李楠郑明治
Owner GUANGDONG UNIV OF TECH
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