Control circuit, power factor correction circuit, and electrical device

The invention provides a control circuit, a power factor correction circuit and an electrical apparatus. A control circuit controls a power factor correction circuit including a DC-DC converter. The control circuit includes an amplifier configured to amplify a voltage corresponding to an output voltage of the DC-DC converter, a comparator configured to compare an output voltage of the amplifier with a ramp voltage, and a driver configured to drive the amplifier to amplify a voltage corresponding to the output voltage of the DC-DC converter. The ramp voltage corresponds to a current passing through a switching element in the DC-DC converter, and the driver is configured to drive the switching element based on an output voltage of the comparator. The control circuit is configured to adjust at least one of a gain of the amplifier and a gradient of the ramp voltage according to a load power of the DC-DC converter. 本发明提供了控制电路、功率因数校正电路和电气设备。一种控制电路控制包括DC-DC转换器的功率因数校正电路。所述控制电路包括放大器、比较器和驱动器，所述放大器被配置为放大与所述DC-DC转换器的输出电压