TV set protection circuit
A technology for protecting circuits and TVs, which is applied in TVs, color TVs, and parts of color TVs, etc. It can solve the problems of lack of protection for the anode high voltage of TV picture tubes, complex protection circuit structure, and difficult layout of circuit boards. Ingenious, simple structure, and the effect of improving robustness
Active Publication Date: 2008-01-16
HISENSE +1
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Problems solved by technology
[0003] In order to overcome the shortcomings of complex structure of TV protection circuit in the prior art, difficulty in layout of circuit board, and lack of protection for high voltage anode of TV picture tube, the present invention provides a new type of TV protection circuit, which adopts the design idea of multiple protection, Unified design of high voltage protection and other circuit protection, with a simple circuit structure, improves the robustness of the protection circuit, and achieves the purpose of protecting human health and component safety
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[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0014] In Figure 1, the output terminal of the high-voltage sampling signal is grounded through diodes DH17, DH13 and voltage dividing resistors RH25, RH24. The connection point of the two voltage dividing resistors RH25, RH24 is connected to the negative pole of a Zener diode DH15, and its positive pole is connected to XRAYPROT port. In the normal working state of the TV, after the sampling voltage output from the high voltage package passes through the diodes DH17 and DH13, the voltage is divided by the voltage dividing resistors RH25 and RH24, and a reverse voltage is generated at the Zener diode DH15, and the reverse voltage of the Zener diode DH15 The breakdown voltage can be set according to the resistance values of the voltage dividing resistors RH25 and RH24. When the high-voltage output increases, the high-voltage sampling...
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The invention discloses a protective circuit of TV set, which uses the design conception of multiple-protection, integrates the high-voltage circuit sampling, the ABL circuit sampling, the current sampling generated by the horizontal-output transformer, the field integrated circuit sampling and the main power over-voltage sampling into one point by the control circuit to be connected to the auxiliary power board, and uses the auxiliary power breaking method to execute the protective motion, so the effective protection on the inner unit and the integrated circuit of TV set can be realized while the service life of TV set is prolonged too. In addition, a voice-image noise silence is added into said protective circuit which can operate the noise silencing control on the voice and image of TV set when the operation of horizontal-field circuit or the waiting voltage is abnormal, for improving the whole property of TV set. The inventive multiple-protection circuit has simple structure and skilled design while one sampling circuit has be broken, the normal operation of whole circuit will not be affected, so the operational stability is improved.
Description
technical field [0001] The invention relates to an improvement of a TV circuit, in particular to a protection circuit applied to a TV. Background technique [0002] At present, in existing TV sets, in order to prevent components, integrated circuits, etc. from being damaged when the circuit works abnormally, a protection circuit is generally designed in the TV circuit. Generally, there are two types of control performed by the TV protection circuit: one is the way of stopping the vibration of the line output transformer; the other is the way of cutting off the power supply or stopping the vibration of the power transformer. The protection circuit is generally used for main power overcurrent sampling, power supply overvoltage sampling, horizontal scanning abnormal sampling, field scanning abnormal sampling and picture tube abnormal sampling, etc. If the above circuits work abnormally and the sampling voltage is higher than the normal value, the sampling signal of the protect...
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IPC IPC(8): H04N5/63
Inventor 赵仁智唐顺忠尚军辉李春圃杨明
Owner HISENSE