Television power supply protective circuit
A power protection and circuit technology, used in emergency protection circuit devices, TVs, protections that respond to undervoltage or no voltage, etc., can solve problems such as burnt devices, rebound and damage of LCD power supply voltage, and eliminate screen flicker. Effect
Active Publication Date: 2008-07-30
HISENSE VISUAL TECH CO LTD
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Problems solved by technology
The under-voltage and over-voltage protection circuit of the LCD TV power supply has not been found so far. Since the LCD TV power supply has no under-voltage and over-voltage protection, when the input voltage is reduced, the operating current must be increased to ensure the output power, which is extremely difficult. It is easy to burn the front-end devices of the circuit, and when the AC power is cut off, the power management chip is still working for a certain period of time, causing the power supply voltage of the LCD screen to rebound, causing the LCD screen to appear flickering
When there is a problem with the feedback circuit, the output voltage of the feedback will exceed its set value, which may cause the back-end part to fail to work or be damaged, which is the deficiency of the existing technology
Method used
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Embodiment Construction
[0009] In order to clearly illustrate the technical features of the solution, the solution will be described below through a specific implementation mode combined with the accompanying drawings.
[0010] through the accompanying drawings figure 1 It can be seen that the TV power supply protection circuit of this scheme has the power supply input voltage Vac output to the first diode D1 after being rectified and filtered by the filter capacitor C1, as well as the first power supply chip N1 and the second power supply chip N2. This scheme is An input detection control circuit 1 is connected in series between the negative terminal of the first diode D1 and the first chip N1 of the power supply. The input detection control circuit 1 and the first chip N1 of the power supply have a common supply voltage Vin, and input The detection control circuit 1 outputs the power supply voltage Vcc under the control of the first power supply chip N1, and the power supply voltage Vcc supplies po...
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The invention provides a technical proposal of a TV power protection circuit, which comprises a power input voltage Vac transmitted to a first diode D1 and rectified thereby, a filter capacitor C1 for filtering the power input voltage, and a power first chip N1 and a power second chip N2. The proposal is characterized in that an input detection control circuit is serially connected between the negative terminal of the first diode D1 and the power first chip N1, the input detection control shares a power supply voltage Vin with the power first chip N1 and outputs a power supply voltage Vcc under the control of the power first chip N1, the power second chip N2 is supplied with the power supply voltage Vcc and outputs a feedback voltage Vpfc through a control power circuit, the power second chip N2 is connected with a feedback detection circuit, and the feedback detection circuit is connected with the input detection control circuit and the feedback voltage Vpfc.
Description
Technical field: [0001] The invention relates to a protection circuit for a television, in particular to a protection circuit for a television power supply. Background technique: [0002] In the prior art, the well-known technology is Patent No. 97214321.1 authorized by the State Intellectual Property Office, which discloses a TV power protector, which can prevent the TV from burning out when a short circuit occurs in the TV circuit. and the occurrence of fire. The under-voltage and over-voltage protection circuit of the LCD TV power supply has not been found so far. Since the LCD TV power supply has no under-voltage and over-voltage protection, when the input voltage is reduced, the operating current must be increased to ensure the output power, which is extremely difficult. It is easy to burn the front-end devices of the circuit, and when the AC power is cut off, the power management chip is still working for a certain period of time, causing the LCD screen power supply v...
Claims
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Login to View More IPC IPC(8): H02H3/24H02H3/20H02H3/08H02H7/20H04N5/63
Inventor 迟洪波
Owner HISENSE VISUAL TECH CO LTD