A transformerless motor circuit breaker and its opening and closing control method

Abstract

The invention provides a transformerless motor circuit breaker and its opening and closing control method. The transformerless motor circuit breaker includes a power module, an MCU module, a motor drive module, a signal acquisition module and an isolation 485 interface module. The power module is connected to the MCU respectively. Module, motor drive module, signal acquisition module, isolated 485 interface module electrical signal connection; power supply module includes power-taking unit, lightning surge suppression unit, main power supply, 485 power supply and MCU power supply. The non-transformer motor circuit breaker of the present invention adopts a step-down non-isolated conversion circuit, which can provide perfect protection functions such as over-temperature, over-current, over-voltage, and under-voltage; the opening and closing control method of the transformer-free motor circuit breaker With multi-redundant protection for fault handling and early warning and alarm functions for faults, it can ensure that the motor completes the closing or opening action normally, effectively reducing the use defects of the circuit breaker and ensuring the safety of use.

Description

technical field [0001] The invention relates to the technical field of intelligent circuit breakers, in particular to a transformerless motor circuit breaker with a 485 interface and an opening and closing control method thereof. Background technique [0002] Since 2015, the meter-mounted circuit breaker has made the mechanism based on motor control circuit breaker closing / opening pass the market verification and tend to be stable. See figure 1 , figure 1 It is the interface relationship and control relationship diagram between the electric meter external circuit breaker and the electric meter. The electric meter external circuit breaker and the electric meter have the following characteristics: [0003] 1. One-to-one cooperation [0004] 2. The signal relationship is: control signal and feedback signal, and the signal is AC220V. [0005] The mechanism of the meter-mounted circuit breaker has been changed from the early small motor and metal gear combination to the lower...

AI Technical Summary

Problems solved by technology

[0006] 1. When the closing command is executed, the motor will stop halfway, causing the handle to be between disconnection and connection. Because the motor has been locked, the handle cannot be operated manually;

[0007] 2. The motor rotates counterclockwise to the closing position switch to realize closing-connecting the line, and continues to run to the opening position to realize opening-breaking the line. When the circuit breaker executes the closing or opening command, the motor does not stop. Cause the circuit breaker circuit to switch back and forth between on and off, and the user cannot use electricity normally

[0008] In addition, most of the existing reclosing circuit breakers judge the on / off state of the circuit breaker by collecting the voltage at the outlet of the circuit breaker. This judgment method has certain defects, especially for capacitive loads, there will be a judgment delay , and the delay time varies with the load

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