A short-circuit protection circuit and a backlight driving circuit
A technology of short circuit protection circuit and backlight drive circuit, applied in the field of electronics, can solve the problems of short circuit of positive and negative electrodes of the capacitor of the booster circuit, damage to the components of the booster circuit, potential safety hazards, etc.
Active Publication Date: 2019-01-22
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
A typical LED drive circuit is composed of an input voltage and a boost circuit. A typical LED light source is composed of multiple groups of LED lights connected in parallel. When the positive and negative electrodes of one group of LED lights are short-circuited, the capacitance of the boost circuit will The positive and negative poles are short-circuited, and the boost circuit cannot output voltage to the LED
When the LED is short-circuited, although the boost circuit will not continue to output voltage to the LED, the components in the boost circuit will always have a high current passing through, which will damage the components in the boost circuit and bring safety hazards
Method used
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Embodiment Construction
[0015] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.
[0016] The embodiment of the invention discloses a short-circuit protection circuit and a backlight driving circuit, which can completely close the boost circuit when a short circuit occurs, and protect components in the boost circuit. Each will be described in detail below.
[0017] see figure 1 , figure 1 It is a functional module schematic diagram of a short circuit protection circuit disclosed by the present invention. Such as figure 1 As shown, the short circuit protection circuit 10 includes a detection circuit 11, a voltage divider circuit 12 and a trigger circuit 13. The short circuit protection circuit 10 is used to connect the voltage module 20 and the boost circuit 30, wherein:
[0018] The input end of the detection circuit 11 is connected to the output end of the voltage module 20, and the output end of the detection circuit 11 is connected to t...
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The invention discloses a short-circuit protection circuit and a backlight drive circuit. The short-circuit protection circuit includes a detection circuit, a voltage dividing circuit and a trigger circuit. The short-circuit protection circuit is used to connect a voltage module and a boost circuit, and the input end of the detection circuit is connected to the voltage module. output end, the output end of the detection circuit is connected to the input end of the boost circuit; the detection end of the detection circuit is connected to the input end of the voltage divider circuit, the output end of the voltage divider circuit is connected to the input end of the trigger circuit, and the output end of the trigger circuit is connected to the The control terminal, the output terminal of the transformer is connected to the input terminal of the voltage module. By implementing the embodiment of the present invention, the boost circuit can be completely closed to protect components in the boost circuit when a short circuit occurs.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a short circuit protection circuit and a backlight driving circuit. Background technique [0002] With the rapid development of consumer electronic products, various liquid crystal displays (Liquid Crystal Display, LCD) have been widely used. A liquid crystal display generally adopts a light emitting diode (Light Emitting Diode, LED) as a backlight source, and the LED backlight generally includes an LED light source and an LED driving circuit. A typical LED drive circuit is composed of an input voltage and a boost circuit. A typical LED light source is composed of multiple sets of LED light strings connected in parallel. When the positive and negative electrodes of one set of LED light strings are short-circuited, the capacitance of the boost circuit will The positive and negative poles are short-circuited, and the boost circuit cannot output voltage to the LED. When the LE...
Claims
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IPC IPC(8): G09G3/34H05B33/08H05B44/00
CPCG09G3/3406H05B45/50Y02B20/30
Inventor 李文东
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD