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Circuit protection method

A circuit protection and output circuit technology, applied in the field of circuit protection with power switching, can solve problems such as poor effect and complicated implementation, and achieve the effect of accurate action

Inactive Publication Date: 2011-11-02
北京为华新光电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method is usually complicated to implement and the effect is not good

Method used

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Embodiment Construction

[0026] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0027] Such as figure 1 As shown, it is a flow chart of the circuit protection method with power switching in the present invention, and the circuit protection method with power switching includes:

[0028] Step 1, judge whether the load circuit is short-circuited. For example, when the load is damaged in an open circuit state or the output line is short-circuited, if it is not in a short-circuit state, perform step 10 to turn on the output circuit (BUCK circuit is a step-down DC-to-DC circuit);

[0029] Turning on the BUCK circuit is realized by sampling the short-circuit signal of the single-chip microcomputer: when the voltage at the sampling terminal of the short-circuit signal is lower than the internally set reference voltage, the switch signal is set high to achieve protection purposes.

[0030] Step 11, delayi...

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Abstract

The invention relates to a circuit protection method, comprising the steps of: judging whether a load circuit is short-circuited, and if not, opening an output circuit; prolonging a first delaying time and judging whether the load circuit is open-circuited; if so, closing the output circuit; prolonging a second delaying time and judging whether the load circuit is open-circuited once again; if so, prolonging the second delaying time repeatedly and judging whether the load circuit is open-circuited once again; and turning off when the repeated time is equal to a first threshold time. According to the invention, when a lamp is abnormal, a protection circuit can act rapidly and accurately so that a power supply of a ballast or a main circuit is cut off until the abnormal state is eliminated and the ballast can return to work normally.

Description

technical field [0001] The invention relates to a circuit protection method, in particular to a circuit protection method with power switching for an HID lamp ballast. Background technique [0002] In general, there are two ways to realize the circuit protection system. [0003] The first is to use various diodes, triodes, operational amplifiers and other analog devices to build a protection circuit that can achieve a certain protection function. Its main disadvantage is that it is weak in interference and prone to false protection. For example, when the sampling circuit picks up a current value greater than 0.1, the protection circuit will start and the ballast will stop working, and sometimes the interference signal will be greater than this value, causing the protection circuit to start wrongly and make the ballast stop working. However, the implementation of the hardware circuit in power switching is quite complicated, which will increase the production cost of the ball...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/292
CPCY02B20/208Y02B20/00
Inventor 乔凯王迎丰鄂凌松都金龙
Owner 北京为华新光电子有限公司