Totem-pole pfc circuit, power module and electrical apparatus
By controlling the switch to close and utilizing capacitive units for energy release and charging in the totem pole PFC circuit, the problem of high voltage change rate is solved, and electromagnetic compatibility is improved.
CN119966194BActive Publication Date: 2026-07-21GUANGDONG MIDEA ELECTRIC CO LTD +1
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGDONG MIDEA ELECTRIC CO LTD
- Filing Date
- 2024-12-31
- Publication Date
- 2026-07-21
AI Technical Summary
Technical Problem
During the commutation process near the zero-crossing point of the AC voltage source, the totem-pole PFC circuit exhibits a high rate of voltage change at the connection point, leading to electromagnetic interference and noise issues and affecting the electromagnetic compatibility of the equipment.
Method used
In inverter mode, by controlling the closing of the first and second switches, energy is released and charged using capacitive units, extending the commutation time, reducing the voltage change rate, and lowering circuit noise.
Benefits of technology
It effectively reduces circuit noise, improves electromagnetic compatibility performance, extends commutation time, reduces the possibility of current surges, and enhances the electromagnetic compatibility of the equipment.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN119966194B_ABST
Abstract
The disclosure is a totem pole PFC circuit, a power module and a power utilization device. The circuit comprises a first bridge arm, a second bridge arm, an inductor and a controller, the first bridge arm comprises a first switch, a second switch, a first capacitive unit and a second capacitive unit, the first switch is connected with the second switch, and a first connection point is connected to a first end of an alternating voltage source; the first capacitive unit is connected in parallel with the first switch, and the second capacitive unit is connected in parallel with the second switch; the second bridge arm comprises a third switch and a fourth switch connected in series; and the controller is configured to: in an inverter working mode, in the case that the alternating voltage source meets a specified first low voltage value condition and / or the inductor meets a specified low current value condition, control a switch in an open state among the first switch and the second switch to be closed. By using the technical solution provided by the disclosure, the commutation time of the first connection point can be prolonged, and thus the voltage change rate during commutation of the first bridge arm can be reduced, the common mode noise can be reduced, and the electromagnetic compatibility performance can be improved.
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