一种用于开关电源的尖峰吸收电路
By combining mesh resistor circuits and large-value circuits in the switching power supply, the problem of insufficient peak absorption capability is solved, the resistance temperature rise and resistance drift are reduced, and the peak absorption effect is improved, especially under high output power conditions.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIAN IGOR ELECTRIC CO LTD
- Filing Date
- 2025-06-16
- Publication Date
- 2026-07-17
AI Technical Summary
In existing switching power supplies, the peak absorption circuit structure is suboptimal, resulting in insufficient peak absorption capability and problems such as resistor temperature rise, resistance drift, and thermal noise. In particular, under high voltage or high current conditions, the resistor components are prone to aging and failure.
By employing a grid resistor circuit and a large-value circuit, and through a composite electrical connection of series and parallel resistors, multiple current paths are formed to reduce the current load and voltage stress of a single resistor. Combined with a large-value RC circuit, the damping effect is improved, and the peak absorption capability is enhanced.
It effectively suppresses voltage spikes caused by transformer leakage inductance, reduces resistor temperature rise, solves resistor aging and resistance drift problems, significantly improves the peak absorption effect of rectifier diodes, and is suitable for high output power scenarios with multiple diodes in parallel.
Smart Images
Figure CN224520928U_ABST
Abstract
Claims
1. A spike absorption circuit for a switching power supply, the switching power supply comprising a transformer T1, a MOS transistor Q1 connected to a primary main winding of the transformer T1, and a diode D1 connected to a secondary winding of the transformer T1; characterized in that: It includes a grid resistor circuit, capacitor C2, diode D2, a high-resistance circuit, and capacitor C1; one end of the grid resistor circuit and one end of the capacitor C2 are electrically connected to the positive terminal of the primary winding of the transformer T1, the other end of the grid resistor circuit and the other end of the capacitor C2 are electrically connected to the cathode of the diode D2, and the anode of the diode D2 is electrically connected to the ground terminal of the primary winding of the transformer T1 and the common junction of the MOSFET Q1; One end of the high-resistance circuit is electrically connected to the anode of the diode D1, the other end of the high-resistance circuit is electrically connected to one end of the capacitor C1, and the other end of the capacitor C1 is electrically connected to the cathode of the diode D1.
2. A spike absorbing circuit for a switching power supply as defined in claim 1, characterized in that: The grid resistor circuit includes multiple series resistor branches; each series resistor branch is formed by at least two resistors R1 connected in series. One end of each series resistor branch is used as one end of the grid resistor circuit, and the other end of each series resistor branch is used as the other end of the grid resistor circuit; in each series resistor branch, the common connection point of every two resistors R1 is electrically connected to the common connection point of the adjacent series resistor branch.
3. A spike absorbing circuit for a switching power supply as defined in claim 2, characterized in that: In the series resistor branch, the resistance values of each resistor R1 are equal.
4. The spike absorbing circuit for a switching power supply according to claim 2, wherein: The series resistor branch is formed by two resistors R1 connected in series, and the number of series resistor branches does not exceed four.
5. The spike absorbing circuit for a switching power supply according to claim 1, wherein: The high-resistance circuit is composed of multiple resistors R10 connected in series.