An arc protection circuit at the high voltage end of an LCD backlight inverter power supply
A technology of inverter power supply and protection circuit, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as arcing and potential safety hazards, and achieve the effect of eliminating personal and property losses
Inactive Publication Date: 2016-03-09
HUIZHOU SANHUA IND
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Problems solved by technology
[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an arc protection circuit for the high-voltage end of the LCD backlight inverter power supply, so as to solve the problem that the high-voltage end of the current backlight inverter power supply circuit is in poor contact at any point Under the circumstances, it will cause the arcing phenomenon between the two points, which will lead to the problem of fire and potential safety hazards.
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[0015] Such as figure 1 As shown, an arc protection circuit at the high voltage end of an LCD backlight inverter power supply includes
[0016] A high-voltage sampling control circuit 1, which is connected to the voltage input terminal (INPUT), samples the input voltage signal respectively from a high-voltage sine wave signal and converts it into a low-voltage sine wave signal;
[0017] The phase comparison control circuit 2 is used to superimpose the low-voltage sine wave signal sent from the high-voltage sampling control circuit 1, and output the potential difference as 0 or Sine wave signal with potential difference;
[0018] The rectification and filtering control circuit 3 is used to rectify and filter the sine wave signal sent by the phase comparison control circuit 2 to obtain a DC voltage signal;
[0019] The PWM control chip circuit 4 is used to compare the DC voltage signal sent by the rectification and filtering control circuit 3 with its internal positive-phase r...
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The invention discloses an LCD (Liquid Crystal Display) backlight inverter power supply high voltage terminal arc discharge protection circuit, which comprises a high-voltage sampling control circuit, a phase comparison control circuit, a rectifier filter control circuit and a PWM (Pulse-Width Modulation) control chip circuit, wherein the high-voltage sampling control circuit respectively samples a high-voltage sine wave signal and converts the high-voltage sine wave signal into a low-voltage sine wave signal; the phase comparison control circuit is used for signal superposition of the low-voltage sine wave signal sent from the high-voltage sampling control circuit; and the rectifier filter control circuit is used for carrying out rectifier filter processing to obtain a direct-current voltage signal. When any point at a high-voltage end is in bad contact to cause arc discharge, the high-voltage sampling control circuit samples a high-voltage sine wave signal with wave amplitude which is different from the wave amplitude during original normal work from a high-voltage input end, a sine wave signal with potential difference can be obtained through phase comparison of the phase comparison control circuit, and the sine wave signal is processed through rectifier filter so as to drive the PWM control chip circuit to stop work, so that no high voltage output occurred at a high voltage output end, and the potential safety hazard caused by ignition of a PCB (Printed Circuit Board) is effectively avoided.
Description
technical field [0001] The invention relates to LCD backlight inverter power protection circuit technology, in particular to a backlight inverter power protection circuit used in LCD TVs and LCD displays. Background technique [0002] With the continuous popularization of LCD TVs and LCD monitors, people are not only satisfied with the continuous improvement of the visual experience and functions of LCD TVs and LCD monitors, but also put forward higher requirements for their safe use. And the backlight inverter power supply of existing LCD TV and LCD display can cause arcing between these two points when its high-voltage end is poorly connected at any point, which may cause the PCB board to catch fire, so there is a serious potential safety hazard. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an arc protection circuit at the high-voltage end of the LCD backlight inverter power supply, s...
Claims
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IPC IPC(8): H02H7/122
Inventor ιδΈε
Owner HUIZHOU SANHUA IND