Abstract: An energy-saving control device is disclosed. The control device is connected with an integrated circuit (IC) and a secondary winding of a transformer of a power converter. A primary winding of the transformer receives energy, and then the energy is discharged from the secondary winding and an energy signal of the energy is generated. And the energy signal comprises a high-frequency part and a low-frequency part thereafter. The energy signal is received by the energy-saving control device to control the operation of the IC according to a ratio of the low-frequency part to the high-frequency part.

Abstract: A high-voltage (HV) startup device is disclosed. The HV startup device is connected with a control circuit of a switching power supply and receives a high voltage to provide and increase a triggering voltage received by the control circuit, wherein the control circuit is a pulse width modulator (PWM) or a pulse frequency modulator (PFM). When the triggering voltage reaches to a preset voltage of the control circuit, the control circuit sends out a control signal and the switching power supply uses the control signal to generate a sense signal. The HV startup device receives the control signal or the sense signal to stop providing the triggering voltage.

Abstract: An energy-saving control device is disclosed. The control device is connected with an integrated circuit (IC) and a secondary winding of a transformer of a power converter. A primary winding of the transformer receives energy, and then the energy is discharged from the secondary winding and an energy signal of the energy is generated. And the energy signal comprises a high-frequency part and a low-frequency part thereafter. The energy signal is received by the energy-saving control device to control the operation of the IC according to a ratio of the low-frequency part to the high-frequency part.