Abstract: A method for controlling converter such as a Flyback converter is disclosed. A load of the Flyback converter varies between zero and a peak value. The method includes: a load detecting step for detecting the load; and an operating mode control step for controlling the Flyback converter to switch between two or more of a continuous conduction mode, a valley conduction mode and a burst mode according to the load. A converter such as a Flyback converter is also provided.

Abstract: A switching power supply and a method for controlling a voltage of a Bulk capacitor in the switching power supply are provided. The switching power supply includes: a rectifying unit; a Bulk capacitor; a converter; a monitoring circuit; a control circuit, controlling discharging of the Bulk capacitor, being configured to perform controls such that the voltage across the Bulk capacitor maintains the peak value after the Bulk capacitor having been charged to a peak value of AC voltage, and to perform controls such that the Bulk capacitor discharges from a peak value when the instantaneous absolute value of the AC voltage is smaller than or equal to the preset voltage. Using the technical solution of the present disclosure, a discharging time of the Bulk capacitor can be shortened, and thereby the volume of the Bulk capacitor is reduced. Consequently, it is conducive to realize miniaturization of the switching power supply.

Abstract: A capacitor discharge circuit and a power converter are provided. The capacitor discharge circuit includes a detection circuit and a discharge loop; the detection circuit has input ends electrically connected with input ends of an AC power supply, and an output end outputting a discharge detection signal to an input end of the discharge loop; the discharge loop is electrically connected with both ends of the capacitor that needs to be discharged and includes a switch unit and an energy consumption unit. When the AC power supply is disconnected, the discharge detection signal switches on the switch unit to conduct the discharge loop, such that the energy consumption unit discharges the capacitor that needs to be discharged. The power converter includes the capacitor discharge circuit.

Abstract: A method for controlling converter such as a Flyback converter is disclosed. A load of the Flyback converter varies between zero and a peak value. The method includes: a load detecting step for detecting the load; and an operating mode control step for controlling the Flyback converter to switch between two or more of a continuous conduction mode, a valley conduction mode and a burst mode according to the load. A converter such as a Flyback converter is also provided.

Abstract: The disclosure relates to a control device, a control method of a power converter and a switching power supply using the control device. The control device of the power converter includes: a first control unit, which is coupled to the power converter to detect an output voltage of the power converter and is configured to generate a first control signal based on the output voltage; a variable resistor unit, which is connected to an output terminal of the first control unit to receive the first control signal and is configured to generate a resistance value based on the first control signal; and a second control unit, which is connected to the variable resistor unit and is configured to output a second control signal in order to control operations of a switch unit of the power converter.

Abstract: The present disclosure discloses a capacitor discharge circuit and a power converter. The capacitor discharge circuit includes a detection circuit and a discharge loop; the detection circuit has input ends electrically connected with input ends of an AC power supply, and an output end outputting a discharge detection signal to an input end of the discharge loop; the discharge loop is electrically connected with both ends of the capacitor that needs to be discharged and includes a switch unit and an energy consumption unit. When the AC power supply is disconnected, the discharge detection signal switches on the switch unit to conduct the discharge loop, such that the energy consumption unit discharges the capacitor that needs to be discharged. The present disclosure also provides a power converter including the capacitor discharge circuit. The present disclosure can reduce the power consumption caused by discharging the capacitor that needs to be discharged.

Abstract: A power supply module to power the control circuit of a switching mode power supply is provided. Based on the determination of whether the switching mode power supply is under a light or open load condition, the power supply module can dynamically provide the power to the control circuit of the switching mode power supply. Therefore, the performance of the power supply can be increased and the power loss can be decreased when the switching mode power supply is under a light or open load.

Abstract: A power supply module to power the control circuit of a switching mode power supply is provided. Based on the determination of whether the switching mode power supply is under a light or open load condition, the power supply module can dynamically provide the power to the control circuit of the switching mode power supply. Therefore, the performance of the power supply can be increased and the power loss can be decreased when the switching mode power supply is under a light or open load.