Double-voltage adaptive rectification PFC (Power Factor Correction) circuit structure and electric flame stove

By using a PFC circuit structure with dual voltage adaptive rectification, the compatibility and stability issues of electric flame stoves under different voltages are solved, achieving low-loss, high-efficiency energy conversion and electromagnetic compatibility.

CN121124547APending Publication Date: 2025-12-12YINENG ELECTRIC FLAME TECH (SHENZHEN) CO LTD
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Patent Information

Application Number
CN202511649003.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-12
Publication Date
2025-12-12

AI Technical Summary

Technical Problem

Existing electric flame stoves are only compatible with 220V-240V voltage and cannot be used with 110V voltage. Furthermore, frequent switching of load impedance leads to circuit stability and electromagnetic compatibility issues.

Method used

The PFC circuit structure adopts dual voltage adaptive rectification, including an EMI filter unit, a voltage doubler rectifier unit, a full-bridge rectifier unit, a circuit switching control unit, a power-on protection unit, and a power factor correction unit. Through the control of relays and MOSFETs, the circuit can achieve stable switching under different voltages and maximize the power factor.

Benefits of technology

It achieves compatibility with 220V and 110V voltages, ensures circuit stability and low-loss energy conversion under varying load impedance, and improves electromagnetic compatibility and power factor.

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Abstract

The invention discloses a double-voltage adaptive rectification PFC (Power Factor Correction) circuit structure and an electric flame stove. The double-voltage adaptive rectification PFC circuit structure comprises an EMI (Electro-Magnetic Interference) filtering unit, a voltage doubling rectification unit, a full-bridge rectification unit, a circuit switching control unit, a startup protection unit and a power factor correction unit. According to the circuit switching control unit, through conversion of full-bridge rectification or voltage-multiplying rectification, adaptability to commercial power of two different voltages is achieved; according to the power-on protection unit, when 220V mains supply is input, after the circuit voltage is stabilized, the relay RLY2 is completely switched on, and soft start protection is achieved; according to the invention, the MOS tube Q1 / Q2 is alternately connected and disconnected in a time sequence, so that the inductor L2 stores energy or discharges, the capacitor C22 is charged or discharged, the power factor correction unit outputs stable high-voltage electricity to a rear-end circuit or a load, when the MOS tube Q2 is connected, the resistance is zero, the superposed high-voltage electricity is transmitted to the rear-end circuit when the potential of the inductor L2 discharges, and low-loss energy conversion is realized.
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