Power grid voltage detection method, detection circuit, PCB and controller

By monitoring the current and voltage in the power grid voltage detection circuit in real time, calculating the power grid voltage and generating protection instructions, the problems of insufficient grid voltage detection accuracy and safety hazards in the prior art are solved, and the stability and reliability of the air conditioning system are improved.

CN119689060APending Publication Date: 2025-03-25GUANGDONG SHENLING ENVIRONMENT SYST CO LTD
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Patent Information

Application Number
CN202411831926.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-12
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

The prior art uses resistive voltage division technology without isolation in environments where isolation protection is required, which poses safety risks and the grid voltage detection accuracy is insufficient, which affects the accuracy of protection instructions and the stability of the air conditioning system.

Method used

The power grid voltage detection circuit including a filter unit, a switching power supply unit, a control unit, a voltage detection unit, a current detection unit and a voltage stabilization unit is adopted to monitor the current and voltage in real time, obtain the voltage correction compensation value, calculate the real-time power grid voltage, and generate protection instructions based on the preset appropriate voltage range.

Benefits of technology

It improves the accuracy of grid voltage measurement, enhances the accuracy and effectiveness of protection instructions, improves the operating stability and reliability of the air conditioning system, and avoids safety hazards.

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Abstract

The invention discloses a power grid voltage detection method, a detection circuit, a PCB and a controller, and the method comprises the steps: obtaining a real-time voltage fed back by a voltage detection unit, and obtaining a real-time current fed back by a current detection unit in real time; determining a voltage correction compensation value based on the real-time current, and determining a real-time network voltage based on the real-time voltage and the voltage correction compensation value; acquiring a preset appropriate voltage range, judging whether the real-time power grid voltage is within the preset appropriate voltage range, and if not, generating a protection instruction according to a judgment result; according to the power grid voltage detection method disclosed by the invention, the current is monitored in real time by using the current detection unit to obtain the voltage correction compensation value, and the real-time power grid voltage is calculated in combination with the real-time voltage obtained by the voltage detection unit, so that the power grid voltage measurement precision can be effectively improved, and the accuracy and effectiveness of the generated protection instruction are improved; and the stability and the reliability of the air conditioning system during operation are further improved.
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