Circuit working state real-time monitoring method

Abstract

Especially, the invention is related to circuit control technique of TV circuit part. The invention discloses method for real time monitoring and controlling operating state of peripheral IC in TV circuit. When operating state is abnormal, the method closes down electrical source of power supply module. The method includes steps: (1) CPU sets up prearranged value for specific register for peripheral IC; (2) after system operates normally, CPU reads value of the specific register according to prearranged cycle, if the value read out from the specific register is equal to the prearranged value for specific register; then, determining the circuit system is in normal operation condition; otherwise, the circuit system is in abnormal condition, and going to step (3); (3) CPU controls system to enter stand by or closedown state, and displays fault state. The invention prevents complete TV set from operating on abnormal condition so as to raise reliability and service life.

Description

technical field [0001] The invention relates to the circuit control technology, in particular to the circuit control technology of the TV circuit part. Background technique [0002] The core control part of the circuit system of the flat panel TV is CPU (Central Processing Unit). The CPU is responsible for controlling or managing the peripheral integrated circuits directly connected to it, and the CPU passes the I 2 C bus or other data communication forms to control or manage peripheral integrated circuits. In order to reduce the standby power consumption of the whole machine, the working power of the CPU is usually independent of the working power of its peripheral circuits. Work. The power supply system of the flat-panel TV converts 220 AC power into DC power of different voltage values, which are supplied to the CPU and peripheral integrated circuits respectively. When the whole machine changes from the standby state to the working state, the CPU will reset the periph...

AI Technical Summary

Problems solved by technology

[0004] During the normal working process of the flat-panel TV, if the 220V AC voltage input to the flat-panel TV fluctuates greatly or the user switches the power supply continuously and rapidly, the power system of the whole machine will be unstable, resulting in the peripheral integrated circuits not working normally, and the TV whole The machine will have abnormal image and sound and other system out-of-control phenomena, which will reduce the life of the system or expand the scope of circuit failure in severe cases.

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