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A protection device control method and circuit based on the working state of an ad chip

A technology of protection device and working state, applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, circuit device, etc., can solve the problems of locking and monitoring function failure, adding latch circuit, complicated circuit design, etc. , to achieve the effect of solving the lock-up and monitoring function failure, simplifying the circuit structure and reducing the implementation cost

Active Publication Date: 2022-06-24
NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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Problems solved by technology

[0011] For the deficiencies in the prior art, the purpose of the present invention is to provide a protection device control method and system based on the working state of the AD chip, to solve the problem of setting the comparator through a reference source when using a comparator to monitor the working voltage of the AD chip in the prior art. Threshold value leads to high cost, adding latch circuit leads to complex circuit design, comparator output signal access protection CPU interrupt pin may lead to technical problems of its locking and monitoring function failure

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  • A protection device control method and circuit based on the working state of an ad chip
  • A protection device control method and circuit based on the working state of an ad chip

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Embodiment Construction

[0038] The watchdog chip generally has a power monitoring function. When the power supply voltage is less than the monitoring voltage threshold of the watchdog chip, the chip will pull down the reset output signal to output a low level signal. The width of the reset output signal is generally 200ms. In order to monitor the working voltage of the AD chip, a watchdog chip model with a monitoring voltage threshold value of about 5V can be selected. It can be seen from the analysis that the watchdog chip is used to monitor the working voltage of the AD chip, which has the function of voltage drop pulse broadening, and can detect any small drop in the working voltage. The circuit is simple and the cost is low.

[0039] After testing, the AD chip will have internal logic disorder under disturbed conditions. The inside of the AD chip is a mixed chip of analog and digital. The analog part can be monitored by the BUSY signal. Generally, the protection CPU only monitors the BUSY signal ...

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Abstract

The invention discloses a protection device control method and circuit based on the working state of an AD chip in the field of industrial control technology, aiming to solve the problem of using a comparator to monitor the working voltage of the AD chip in the prior art, and setting the threshold value of the comparator through a reference source. The cost is too high, the addition of a latch circuit leads to complex circuit design, and the access of the comparator output signal to the protection CPU interrupt pin may cause technical problems such as locking and monitoring function failure. The method comprises the following steps: the watchdog chip acquires the operating voltage of the AD chip, and the monitoring voltage threshold of the watchdog chip is adapted to the voltage range of the AD chip; The voltage threshold value is compared to obtain the voltage comparison result; the protection device responds according to the voltage comparison result.

Description

technical field [0001] The invention relates to a protection device control method and circuit based on the working state of an AD chip, belonging to the technical field of industrial control. Background technique [0002] The relay protection device is a device used to monitor the operating status of the power system in real time. The device can issue trip commands and alarm signals in time in the event of a system failure. [0003] When the power system is abnormal, there will be changes in parameters such as current and voltage. Therefore, the protection CPU needs to collect the analog information of the above parameters in real time. The AD chip can convert analog quantities into digital quantities, and the CPU collects parameters such as voltage and current through the AD chip. If the AD sampling circuit is abnormal, it will inevitably cause the CPU sampling value to be wrong, resulting in the malfunction or actuation of the relay protection device. In order to improv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/04
CPCH02H3/044
Inventor 陈庆旭岳峰周兆庆张尧余华武
Owner NANJING GUODIAN NANZI POWER GRID AUTOMATION CO LTD
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