Power factor correction circuit, multiplier and voltage feed-forward circuit
AssigneeCosemitech (Shanghai) Co., Ltd.
InventorsJian You, Xiaoping Yin
Life of this patent
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Abstract
A voltage feed-forward circuit, a multiplier using the voltage feed-forward circuit, and a power factor correction circuit using the multiplier. The voltage feed-forward circuit is used to maintain and output a peak voltage (Vff) of an input voltage (Vin), and includes first switch element (S1), a logic control unit (U1), a second switch element (S2), a first capacitor (C1), a third switch element (S3) and a second capacitor (C2). The first control signal (Φ1) and the second control signal (Φ2) begin to be provided at the same time, and the first control signal (Φ1) stops being provided when a voltage of the second end of the first capacitor (C1) is greater than the peak voltage (Vff) of the input voltage (Vin).
Claims16
A voltage feed-forward circuit applied to a multiplier for maintaining and outputting a peak voltage of an input voltage, wherein, comprising:
- a first switch element, a first end thereof connected to a supply voltage, and a control end thereof causing said first switch element to conduct in response to a first control signal;
- a logic control unit used to output a second control signal during the peak voltage of said input voltage and output a third control signal during a non-peak voltage of said input voltage;
- a first capacitor, a first end thereof grounded;
- a second switch element, a first end thereof connected to a second end of said first switch element, a second end thereof connected to a second end of said first capacitor, and a control end thereof causing said second switch element to conduct in response to said second control signal;
- a third switch element, a first end thereof connected to the second end of said first capacitor, and a control end thereof causing said third switch element to conduct in response to said third control signal;
- and
- a second capacitor, a first end thereof grounded, and a second end thereof connected to a second end of said third switch element and outputting the peak voltage of said input voltage maintained by the second end of said second capacitor;
- wherein said first control signal and said second control signal begin to be provided at the same time, and the first control signal stops being provided when a voltage of the second end of said first capacitor is greater than the peak voltage of said input voltage;
- and
- wherein said logic control unit is further used to output a fourth control signal during the non-peak voltage of said input voltage, said voltage feed-forward circuit further comprising:
- a fourth switch element, a first end thereof connected to the second end of said first capacitor, a second end thereof grounded, and a control end thereof causing said fourth switch element to conduct in response to said fourth control signal.
Dependencies are inferred from the claim text.