Low-cost charging power supply circuit capable of effectively reducing relay current

By employing a high-power DC input power supply and a full-bridge converter in the charging power supply, along with a parallel branch design, large electrolytic capacitors, and microcontroller-controlled relays, the full-bridge converter is optimized, solving the problems of a large number of relays and high heat loss, thus achieving miniaturization and efficient current management of the power supply.

CN223527815UActive Publication Date: 2025-11-07SHENZHEN GOLD POWER TECH
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Patent Information

Application Number
CN202422838290.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-11-20
Publication Date
2025-11-07
Estimated Expiration
2034-11-20

AI Technical Summary

Technical Problem

Existing technologies in high-power charging power supplies involve a large number of relays with significant heat loss, which take up space and make it difficult to effectively reduce input inrush current.

Method used

It adopts a high-power DC input power supply and a full-bridge converter, combined with a parallel first branch and a second branch design. The first branch includes a large electrolytic capacitor and a resistor to prevent starting inrush current, while the second branch includes a relay controlled by a microcontroller. The current is reduced by controlling the relay's activation, and the full-bridge converter is optimized using MOSFETs and capacitors.

Benefits of technology

It effectively reduces the number of relays and heat loss, shrinks the power supply size, increases power density, and reduces input current surges.

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Abstract

The utility model provides a low-cost charging power supply circuit capable of effectively reducing relay current. A first branch circuit and a second branch circuit which are connected in parallel are arranged between an output end of a high-power direct-current input power supply and a high-power full-bridge converter; a large electrolytic capacitor component is arranged on the first branch, and the anode of the large electrolytic capacitor component is connected with the output end of the high-power direct-current input power supply after being connected with a starting impact current prevention resistor component in series and is connected with the input end of the high-power full-bridge converter at the same time; a relay controlled by the single-chip microcomputer control circuit is arranged on the second branch circuit, and the two ends of the relay are connected with the output end of the high-power direct-current input power source and the input end of the high-power full-bridge converter respectively. According to the utility model, the starting impact current prevention resistor element is arranged between the large electrolytic capacitor element and the power supply output end, and when the electric automobile is charged, the starting impact current prevention resistor element is bypassed because the relay is closed, so that the heat is reduced.
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