Water heater power supply circuit and electric water heater

By using a single contactor and control module for synchronous switching in electric water heaters, the problem of multiple power sources supplying power simultaneously is solved, improving the reliability and safety of power supply switching and protecting power supply equipment such as photovoltaic panels.

CN224385140UActive Publication Date: 2026-06-19GUANGDONG VANWARD ELECTRIC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
GUANGDONG VANWARD ELECTRIC
Filing Date
2025-05-26
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing electric water heaters are prone to multiple power sources supplying power simultaneously under various power supply methods, leading to power supply errors such as reverse charging of the photovoltaic panel by the mains power, causing damage to the photovoltaic panel.

Method used

A control module that uses a single contactor in conjunction with a microcontroller, switching transistors, and relays avoids simultaneous power supply from multiple power sources by switching contacts in a synchronous motion manner, thus ensuring the reliability of contactor switching.

Benefits of technology

This effectively avoids the situation where multiple power sources supply power simultaneously, improves the reliability and safety of power supply switching, and protects power supply equipment such as photovoltaic panels.

✦ Generated by Eureka AI based on patent content.

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    Figure CN224385140U_ABST
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Abstract

This application relates to a water heater power supply circuit and an electric water heater, belonging to the field of water heater technology. The water heater power supply circuit includes: a contactor, a control module, and a power supply module; wherein: the contactor is used to switch different power supplies; the control module includes: a microcontroller, a switching transistor, and a relay. The contactor's electromagnetic coil and the relay are connected in series and then connected to the power supply module. The relay's control coil and the switching transistor are connected in series and then connected to the power supply module. The control terminal of the switching transistor is connected to the microcontroller, and the microcontroller is connected to the power supply module. Because the contactor's electromagnetic coil and the relay are connected in series and then connected to the power supply module, the on / off state of the relay affects the on / off state of the contactor's electromagnetic coil and the power supply module, thereby affecting the energization state of the contactor's electromagnetic coil. The contactor's electromagnetic coil switches different power supplies under different energization states, thus completing the switching of the water heater's power supply mode.
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