Power supply unit with functions of open loop protection and short circuit protection

A power supply and short-circuit protection technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, instruments, etc., can solve problems such as application circuit damage at the power supply or load side

Inactive Publication Date: 2011-05-11
SYST GEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the power supply is short-circuited, the application circuit at the power supply or load end may be damaged in a short time

Method used

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  • Power supply unit with functions of open loop protection and short circuit protection
  • Power supply unit with functions of open loop protection and short circuit protection
  • Power supply unit with functions of open loop protection and short circuit protection

Examples

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Embodiment Construction

[0079] In order to have a further understanding and understanding of the structural features of the present invention and the achieved effects, the preferred embodiments and accompanying drawings are used for a detailed description, as follows:

[0080] see figure 2 , which is a circuit diagram of the first embodiment of the power supply with open-loop protection and short-circuit protection of the present invention. The present invention except figure 1 In addition to the prior art shown, a conduction detection circuit 30 , a confirmation circuit 40 and a frequency divider 50 are added. The conduction detection circuit 30 receives the driving signal V G or switching signal V PWM , to detect the power switch Q 1 The conduction time, and generate a short circuit signal S OL . In addition, the conduction detection circuit 30 further receives the frequency signal PLS output by the oscillator 12 . Short circuit signal S OLProvided to confirmation circuit 40 . Confirmatio...

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PUM

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Abstract

The invention relates to a power supply unit with functions of open loop protection and short circuit protection, comprising a transformer, a power switch, a signal generation circuit, a conducting detection circuit and a delay circuit. The transformer is used for receiving an input voltage and generating an output voltage. The power switch is used for switching over the transformer to regulate and output a voltage. The signal generation circuit is used for generating a switchover signal to control the switchover of the power switch. The conducting detection circuit is used for detecting a conducting time of the power switch and generating a short-circuit signal. The delay circuit is used for counting a first delay time or a second delay time according to a feedback signal of the power supply unit and the short-circuit signal so as to generate a cut-off signal to control the signal generation circuit to stop and lock the switchover signal. Accordingly, after the delay circuit counts different delay times under different conditions (short circuits or open loops), a stopping signal is generated to control the signal generation circuit to stop and lock the switchover signal, therefore, the power supply unit can carry out proper protection as soon as possible.

Description

technical field [0001] The invention relates to a power supply, in particular to a power supply with open circuit protection and short circuit protection. Background technique [0002] General power supplies can provide stable voltage and current. In order to comply with safety regulations (safety), the power supply must provide open-loop protection and short circuit protection to ensure that the power supply itself and the application circuit at the load end will not be affected. refer to figure 1 , which is a circuit diagram of a prior art power supply with open-loop protection. A prior art power supply includes a transformer T 1 , reset circuit 14, signal generating circuit 10, oscillator 12, power switch Q 1 , the feedback detection circuit 16 , the delay circuit 18 and the driving circuit 20 . [0003] Such as figure 1 As shown, the transformer T 1 With primary side winding N P with the secondary side winding N S , for energy storage and power conversion. Tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32G01R19/165
CPCH02H9/023H02M1/32H02M1/36H02M3/33507Y02E40/60
Inventor 蔡孟仁阙合梓薛正祺林乾元
Owner SYST GEN
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