Power factor correction control circuit and power adapter

Abstract

The invention discloses a power factor correction control circuit and a power adapter. The power factor correction control circuit comprises a sampler, a controller and a current limiter. The sampler, the controller and the current limiter are sequentially in circuit connection. The controller comprises an error amplifying unit, a peak value adjusting unit, a conduction calculation unit and a phase locking unit, wherein the error amplifying unit, the peak value adjusting unit, the conduction calculation unit and the phase locking unit are sequentially in circuit connection. The sampler is connected with the phase locking unit. The current limiter is connected with the error amplifying unit and the conduction calculation unit respectively. The power adapter comprises an input module, an energy conversion module and an output module, wherein the input module, the energy conversion module and the output module are sequentially in circuit connection. The energy conversion module is provided with an input end, a control end and the power factor correction control circuit. The power factor correction control circuit is connected between the input end and the output end. The power factor correction control circuit is higher in power factor property, lowers the manufacturing cost and improves the electric energy utilization rate.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a power factor correction control circuit and a power adapter for electronic equipment such as liquid crystal displays, televisions, and light-emitting diode lamps. Background technique [0002] In order to provide suitable and stable power for electronic equipment, a power adapter is usually configured in the electronic equipment, and the power adapter mostly uses a pulse width modulation (Pulse Width Modulation, PWM) method to control the voltage value or current value of the output power supply. Power Factor (Power Factor, PF) refers to the relationship between effective power and total power consumption (apparent power), that is, the ratio of effective power divided by total power consumption (apparent power), used for constant power The degree of effective utilization is also one of the important indicators of the characteristics of the constant power adapter. In order ...

AI Technical Summary

Problems solved by technology

Although this power factor correction control circuit in the prior art can play the role of overcurrent protection, because the circuit is realized by an optical coupling device, it has a large volume and high cost, and due to the use of a multiplication circuit , causing the output current of the entire circuit to contain harmonics of the input voltage, resulting in high total harmonic distortion (Total Harmonic Distortion, THD) of the circuit, resulting in low power factor (Power Factor, PF) characteristics, resulting in waste of energy

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