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US 2026/0180465 A1Published application
Single stage sepic power converter with power factor correction
AssigneeRenesas Design (UK) Limited
InventorsJun Zheng, Wenchao Qian, Zhi Yang, Jianming Yao, Yong Li
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Abstract
An isolated SEPIC converter is provided with a power factor correction inductor that couples between an output node from a diode bridge and a terminal of a power switch transistor. When the power switch transistor cycles off, the power factor correction inductor conducts a demagnetizing current through a primary winding of a transformer to charge a bulk capacitor.
Claims20
An isolated switching power converter, comprising:
- an input node for receiving a rectified input voltage from an AC mains;
- a transformer including a first primary winding having a first terminal coupled to the input node;
- a power switch transistor coupled to a second terminal of the primary winding;
- and
- a power factor correction inductor coupled between the input node and the second terminal of the first primary winding.
2 more elements
An isolated switching power converter method, comprising:
- switching on a power switch transistor to magnetize a power factor correction inductor and a primary winding of a transformer;
- and
- demagnetizing the power factor correction inductor responsive to switching off the power switch transistor to conduct a demagnetizing current from the power factor correction inductor and through the primary winding to charge a bulk capacitor.
An isolated SEPIC converter, comprising:
- an input node for receiving a rectified input voltage;
- a main transformer including a first primary winding having a first terminal coupled to the input node;
- a power switch transistor coupled to a second terminal of the primary winding;
- a current sense resistor coupled between ground and the power switch transistor;
- a power factor correction inductor coupled between the input node and a drain of the power switch transistor;
- a current sensor configured to sense a power factor correction current conducted by the power factor correction inductor to provide a power factor correction current measurement;
- and
- a controller configured to sense a voltage across the current sense resistor to determine a combined current conducted by the power switch transistor, the controller being further configured to subtract the power factor correction current measurement from the combined current to determine a primary winding current conducted by the first primary winding.
5 more elements
Dependencies are inferred from the claim text.