Flyback switching power supply

By designing the current limiting module outputs a segmented voltage signal in the flyback switching power supply, the problem of the power factor reduction caused by the electrolytic capacitor after removing the rectifier bridge is solved, and the effect of improving the power factor is achieved.

CN222464447UActive Publication Date: 2025-02-11QINGDAO TOPSCOMM COMM +1
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Patent Information

Application Number
CN202323308106.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-06
Publication Date
2025-02-11
Estimated Expiration
2033-12-06

AI Technical Summary

Technical Problem

After the electrolytic capacitor of the existing flyback switching power supply is removed after the rectifier bridge is removed, the power factor decreases, resulting in increased system losses and increased grid interference.

Method used

A design circuit for flyback switching power supply is designed, using the current limiting module to output a segmented voltage signal that changes with the power tube conduction time, limiting the peak of the primary side current, and improving the proportional relationship between the average input current value and the input voltage. Thus, the power factor is restored.

Benefits of technology

Through this design circuit, the problem of power factor reduction caused by the removal of the electrolytic capacitor after the rectifier bridge is solved. Compared with the power system using electrolytic capacitors after the rectifier bridge, the power factor can be improved to a certain extent.

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Abstract

The utility model discloses a flyback switching power supply, which is suitable for a flyback PFM (Pulse Frequency Modulation) control type switching power supply without an electrolytic capacitor behind a rectifier bridge. Comprising a rectifier bridge, a transformer T1, a power tube M1, a current detection resistor Rcs, an error amplifier AMP, a PID control module, a frequency control module, a logic control module, an MOS driving module, a current limiting module, a comparator Comp, a diode D1, an output capacitor C1, an output divider resistor R2 and a resistor R3, the segmented voltage signal limits the primary side current peak value, and the proportional relation between the input current average value and the input voltage of the power supply system is improved, so that the power factor is improved. According to the utility model, the problem that the power factor is reduced under the condition that no electrolytic capacitor is arranged behind the rectifier bridge is solved, and compared with the condition that a capacitor is arranged behind the rectifier bridge, the power factor is improved to a certain extent.
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