Patent ID: 11949328
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 7:
8. A control circuit for a power factor correction converter that outputs a DC output voltage from an AC input voltage, the control circuit comprising:
a gate driver including:
a high-side driver terminal connected to a high-side switch of the power factor correction converter to turn the high-side switch on and off;
a low-side driver terminal connected to a low-side switch of the power factor correction converter to turn the low-side switch on and off;
a high-side ground terminal connected to a node between the high-side switch and the low-side switch;
a low-side ground terminal connected to a negative output terminal of the power factor correction converter;
a high-side voltage terminal; and
a low-side voltage terminal;

a controller connected to the gate driver;
a bootstrap circuit including:
a bootstrap capacitor connected in parallel with the high-side voltage terminal and the high-side ground terminal and connected to the node; and
a diode connected between the bootstrap capacitor and the low-side voltage terminal; and

a capacitor connected in parallel with the low-side voltage terminal and the low-side ground terminal and connected to the negative output terminal; wherein
the controller is programmed or configured to turn on the low-side switch to pre-charge the bootstrap capacitor at beginnings of negative half-cycles of the AC input voltage.