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Protection device control method and circuit based on AD chip working state

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: 2020-02-11
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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  • Protection device control method and circuit based on AD chip working state
  • Protection device control method and circuit based on AD chip working state

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Embodiment Construction

[0038] The watchdog chip generally has a power monitoring function. When the power supply voltage is lower 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 of about 5V is sufficient. 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 stretching, and can detect any small drop of the working voltage. The circuit is simple and the cost is low.

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

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Abstract

The invention discloses a protection device control method and circuit based on the AD chip working state, belongs to the technical field of industrial control, and aims to solve the technical problems in the prior art that when the comparator is utilized to monitor the working voltage of the AD chip, the cost is too high due to setting the comparator threshold value through the reference source,the circuit design is complicated due to additional arrangement of the latch circuit and the comparator output signal is connected to the protection CPU interrupt pin, which may lead to the locking ofthe comparator and the failure of the monitoring function. The method comprises the following steps: the watchdog chip obtains the working voltage of the AD chip, and the monitoring voltage thresholdvalue of the watchdog chip is adapted to the voltage range of the AD chip; the working voltage is compared with the monitoring voltage threshold value to obtain a voltage comparison result; and the protection device makes a corresponding response 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, and belongs 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 a trip command and an alarm signal in time when the system fails. [0003] When the power system is abnormal, there will be changes in parameters such as current and voltage. Therefore, to protect the CPU, it is necessary to collect analog information of the above parameters in real time. The AD chip can convert the analog quantity into a digital quantity, 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 errors in the CPU sampling value, resulting in malfunction or alarm of the relay protection device. In order to improve the r...

Claims

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Application Information

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Patent Type & Authority Applications(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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