Power supply device

The power supply device addresses the issue of high cost and complexity in DC-DC converters by using a voltage abnormality detection circuit and constant current circuit to transmit stable detection results to the secondary side control circuit, eliminating the need for an auxiliary power supply circuit.

WO2025204076A1 Publication Date: 2025-10-02PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Patent Information

Application Number
PCT/JP2025/002473
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-25
Filing Date
2025-01-27
Publication Date
2025-10-02

AI Technical Summary

Technical Problem

Existing isolated DC-DC converters require an auxiliary power supply circuit to detect voltage abnormalities on the primary side, which increases the size and cost due to the use of high-voltage components and complex circuit configurations.

Method used

A power supply device that includes a voltage abnormality detection circuit on the primary side, a constant current circuit, and an isolated transmission circuit, eliminating the need for an auxiliary power supply circuit by generating a stable constant current to transmit detection results to the secondary side control circuit.

Benefits of technology

Stable detection and transmission of voltage abnormalities without an auxiliary power supply circuit, reducing component count and cost while maintaining efficient operation.

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Abstract

In the present invention, a power supply device (100) comprises: an insulated DC-DC converter (10); a control circuit unit (20) that is provided on the secondary side of the DC-DC converter (10) and controls the DC-DC converter (10); a voltage abnormality detection circuit (30) that detects a voltage abnormality on the primary side of the DC-DC converter (10); a constant current circuit (60) that is provided on the primary side of the DC-DC converter (10) and generates a constant current when any voltage abnormality is detected; and an insulation transmission circuit (photocoupler (40)) that transmits a signal indicating the constant current to the control circuit unit (20).
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