Abstract: A linear constant current drive circuit, including a first end of an LED string is connected to one output end of a rectifier bridge, a second end of the LED string is connected to one end of an energy storage capacitor by using a first switch subcircuit, and the other end of the energy storage capacitor is connected to the other output end of the rectifier bridge; one end of a second switch subcircuit is connected to a junction between the first switch subcircuit and the energy storage capacitor, and the other end of the second switch subcircuit is connected to a tap end of the LED string; and one end of a third switch subcircuit is connected to the second end of the LED string, and the other end of the third switch subcircuit is connected to a junction between the rectifier bridge and the energy storage capacitor.

Abstract: A linear constant current drive circuit, including a first end of an LED string is connected to one output end of a rectifier bridge, a second end of the LED string is connected to one end of an energy storage capacitor by using a first switch subcircuit, and the other end of the energy storage capacitor is connected to the other output end of the rectifier bridge; one end of a second switch subcircuit is connected to a junction between the first switch subcircuit and the energy storage capacitor, and the other end of the second switch subcircuit is connected to a tap end of the LED string; and one end of a third switch subcircuit is connected to the second end of the LED string, and the other end of the third switch subcircuit is connected to a junction between the rectifier bridge and the energy storage capacitor.

Abstract: System and method for power controller. According to an embodiment, the present invention provides a power factor correction apparatus. The apparatus includes a multiplier component that is configured to process a first input signal and a second input signal. For example, the first input signal is associated with a rectified alternating current signal, and the second input signal is associated with an error signal. The multiplier component further is configured to generate a first output signal based on the first input signal and the second input signal. The apparatus also includes a comparator component that is configured to process a third input signal and fourth input signal. The third input signal is associated with the first output signal. The comparator component is further configured to generate a second output signal based on the third input signal and the fourth input signal.

Abstract: System and method for power controller. According to an embodiment, the present invention provides a power factor correction apparatus. The apparatus includes a multiplier component that is configured to process a first input signal and a second input signal. For example, the first input signal is associated with a rectified alternating current signal, and the second input signal is associated with an error signal. The multiplier component further is configured to generate a first output signal based on the first input signal and the second input signal. The apparatus also includes a comparator component that is configured to process a third input signal and fourth input signal. The third input signal is associated with the first output signal. The comparator component is further configured to generate a second output signal based on the third input signal and the fourth input signal.

Abstract: System and method for power controller. According to an embodiment, the present invention provides a power factor correction apparatus. The apparatus includes a multiplier component that is configured to process a first input signal and a second input signal. For example, the first input signal is associated with a rectified alternating current signal, and the second input signal is associated with an error signal. The multiplier component further is configured to generate a first output signal based on the first input signal and the second input signal. The apparatus also includes a comparator component that is configured to process a third input signal and fourth input signal. The third input signal is associated with the first output signal. The comparator component is further configured to generate a second output signal based on the third input signal and the fourth input signal.

Abstract: System and method for power controller. According to an embodiment, the present invention provides a power factor correction apparatus. The apparatus includes a multiplier component that is configured to process a first input signal and a second input signal. For example, the first input signal is associated with a rectified alternating current signal, and the second input signal is associated with an error signal. The multiplier component further is configured to generate a first output signal based on the first input signal and the second input signal. The apparatus also includes a comparator component that is configured to process a third input signal and fourth input signal. The third input signal is associated with the first output signal. The comparator component is further configured to generate a second output signal based on the third input signal and the fourth input signal.