X capacitor discharge control device applied to flyback power source

A capacitor discharge and control device technology, which is applied in the direction of output power conversion devices, control/regulation systems, electrical components, etc., can solve the problems of unfavorable, large discharge resistance, and high cost of power supply systems, so as to speed up discharge, Effect of eliminating standby power consumption

Inactive Publication Date: 2013-07-10
深圳市展芯微电子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to meet the safety regulations on the X-capacitor discharge time limit, the bleeder resistor cannot be too large, so the value of the bleeder resistor is a compromise choice
Moreover, for medium and high-power power supply systems, it is very difficult to reduce the standby power consumption to below 30mW due to the power consumption on the bleeder resistor. Therefore, a single chip for discharging the X capacitor has appeared, but such a power supply system. High cost, not conducive to cost reduction

Method used

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  • X capacitor discharge control device applied to flyback power source
  • X capacitor discharge control device applied to flyback power source
  • X capacitor discharge control device applied to flyback power source

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] At first, the technical term involved in the present invention is explained:

[0044] UVLO: Under Voltage Lockout, undervoltage lockout;

[0045] NJFET: N-channel Junction Field Effect Transistor, N-channel junction field effect transistor;

[0046] PMOS: P-channel metal oxide semiconductor FET, P-channel metal oxide semiconductor field effect transistor;

[0047] NMOS: N-channel metal oxide semiconductor FET, N-channel metal oxide semiconductor field effect transistor.

[0048] Such as figure 2 As shown, it is a typical application circuit diagram of a flyback power supply using the X-capacitor discharge point control device described in the present invention, relative to figure 1 , the X capacitor discharge resistor X-Re...

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PUM

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Abstract

The invention provides an X capacitor discharge control device applied to a flyback power source. The X capacitor discharge control device comprises a high voltage starting circuit, an alternating current voltage detecting circuit and an X capacitor discharge circuit. After two ends of an X capacitor of the flyback power source are switched on by an alternating current power source, the high voltage starting circuit charges for a power source stabilivolt capacitor of a control chip of the flyback power source with a constant current, and when the voltage at two ends of the power source stabilivolt capacitor reaches working voltage of the control chip, the high voltage starting circuit is turned off. The alternating current voltage detecting circuit enters an alternating current voltage detecting model after the high voltage starting circuit is turned off, and the alternating current voltage detecting circuit detects whether alternating voltage exists at the two ends of the X capacitor or not. When the alternating current voltage at the two ends of the X capacitor is not detected, the alternating current voltage detecting circuit controls the X capacitor discharge circuit to discharge for the X capacitor. According to the X capacitor discharge control device applied to the flyback power source, X capacitor discharge can be accelerated, and stand-by power consumption on an X resistor can be removed.

Description

technical field [0001] The invention relates to a discharge control device, in particular to an X capacitor discharge control device applied to a flyback power supply. Background technique [0002] With the continuous progress and development of human society, the consumption of energy is increasing, and energy has gradually become a scarce resource. In order to achieve the maximum utilization rate under the condition of limited resources, it is necessary to reduce the standby power consumption of the power system. ,Improve efficiency. In order to reduce the standby power consumption of the power system, it is necessary to start from the design of the power system to reduce the current and multiplex the circuit. [0003] figure 1 It is a typical application circuit diagram of a traditional flyback power supply. Such as figure 1 Shown is a typical application circuit diagram of a traditional flyback power supply, where X-cap is the X capacitor used to suppress the differe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M3/335
Inventor 雷晗李进
Owner 深圳市展芯微电子技术有限公司
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