A high-voltage backup power supply circuit

By using transformer isolation and a high-voltage backup power supply circuit design with a frequency conversion quasi-resonant main control chip, the problem of high-voltage load redundancy requirements for new energy vehicles is solved, achieving a power supply solution with high reliability and low loss.

CN224520937UActive Publication Date: 2026-07-17JIANGSU RUIKONG ELECTRIC TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Utility models(China)
Current Assignee / Owner
JIANGSU RUIKONG ELECTRIC TECHNOLOGY CO LTD
Filing Date
2025-06-10
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing technologies cannot meet the redundancy requirements of high-voltage loads in new energy vehicles. Traditional 12V low-voltage backup power supplies are difficult to meet the power supply reliability requirements of high-voltage systems, and have problems such as complex components, high cost, and lack of primary and secondary side isolation.

Method used

By using transformer isolation between the primary and secondary sides, feedback from the auxiliary winding, and combining a frequency conversion quasi-resonant main control chip, a high-voltage backup power supply circuit is designed to reduce the types and number of components, lower switching losses, achieve soft switching function, and support reverse protection design.

Benefits of technology

It achieves redundancy requirements for high-voltage loads, reduces the types and costs of components, improves power supply reliability, avoids the risk of high voltage from the primary side being introduced into the secondary side, and reduces switching losses and heat generation.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN224520937U_ABST
    Figure CN224520937U_ABST
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Abstract

This utility model discloses a high-voltage backup power supply circuit, including a capacitor C13 and a diode D7 connected in series. The other ends of capacitor C13 and diode D7 are connected to an input CLC filter circuit. The output terminal of the input CLC filter circuit is connected to one end of resistor R44, an upper transistor drive circuit, an RCD clamping circuit, and one end of the primary winding of transformer T2. The other end of resistor R44 is connected to one end of TVS diode V7 and the main control chip U2. The upper transistor drive circuit is connected to the gate and source of switching transistor Q3 and the drain of switching transistor Q4. The gate of switching transistor Q4 is connected to the main control chip U2. The RCD clamping circuit is connected to the drain of switching transistor Q3 and the other end of the primary winding of transformer T2. One end of the secondary winding of transformer T2 is connected to the output CLC filter circuit through a rectifier diode D8, and the other end of the secondary winding of transformer T2 is directly connected to the output CLC filter circuit. This utility model can meet the redundancy requirements of high-voltage loads.
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