Totem pole power factor correction circuit and current detection device, power module and power equipment thereof
By using a current detection device that samples current through grounding resistance, combined with a control switch and a current source, the high cost of current detection in traditional totem pole power factor correction circuits is solved, achieving low-cost current detection and simplified circuit design.
CN122437369APending Publication Date: 2026-07-21INVENTCHIP TECH CO LTD
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- INVENTCHIP TECH CO LTD
- Filing Date
- 2026-04-22
- Publication Date
- 2026-07-21
AI Technical Summary
Technical Problem
In traditional totem pole power factor correction circuits, current detection is costly and requires isolation circuits, the sampling ratio of Hall sensors is not continuous, and the resistor scheme is complex, resulting in high cost and high components.
Method used
A combination of current detection unit, control switch, sampling capacitor and current source is used to sample the current through grounding resistor, and the inductor current signal is synthesized by control switch and current source, which simplifies the circuit structure and avoids isolation circuit.
Benefits of technology
It reduces the cost of current detection, simplifies circuit design, and is suitable for low-cost totem-pole PFC solutions.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN122437369A_ABST
Abstract
The present disclosure relates to the technical field of integrated circuits, and particularly relates to a totem pole power factor correction circuit and a current detection device, a power module and a power equipment thereof. In the device, the current detection unit is connected to the lower plate of the output capacitor of the totem pole power factor correction circuit, the ground end of the lower bridge arm transistor of the high-frequency bridge arm, and the first end of the control switch. The common node of the second end of the control switch, the output end of the current source and the first end of the sampling capacitor is used as the output end of the current detection device. The control end of the control switch and the control end of the freewheeling transistor of the high-frequency bridge arm are used for receiving the same switch control signal. The second end of the sampling capacitor is grounded. When the totem pole power factor correction circuit works, the output end of the current detection device is configured to output the inductance current detection signal of the inductor in the totem pole power factor correction circuit. The current detection device of the present disclosure has a lower cost and is convenient to use.
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