Abstract: An efficiency tracking method of a controller applied to a flyback power converter includes before the controller soft starts, an original frequency variation curve setting voltage generated by the controller outputting an original frequency variation curve setting detection current to an original frequency variation curve setting detection resistor determining a frequency variation curve of the flyback power converter, and utilizing adjustment of resistance of the original frequency variation curve setting detection resistor to achieve efficiency optimization. Therefore, the controller controls an output voltage of the flyback power converter and tracks a maximum power point of the flyback power converter according to the efficiency tracking method to achieve efficiency optimization.

Abstract: A control method is in use of an interleaved power converter with first and second power stages for generating an output power source. A compensation is generated in response to a feedback signal and a reference voltage, and the feedback signal represents the output power source. The output power of the first power stage is controlled to supply to the output power source in response to the compensation signal. The operation status of the second power stage is switched in response to the compensation signal and the feedback signal, and is prevented from being switched when the feedback signal is beyond a stable range covering the reference voltage.

Abstract: A controller applied to a power converter is installed in a primary side of the power converter. The controller includes a capacitor, an adjustment signal generation circuit, and a discharge circuit. The capacitor is used for generating a tracking voltage. The adjustment signal generation circuit is used for generating an adjustment signal according to a feedback voltage and the tracking voltage. The discharge circuit is used for discharging the capacitor according to the feedback voltage and the adjustment signal. The tracking voltage is used for tracking a state of a magnetizing current of a magnetizing inductor of the primary side of the power converter, and when the tracking voltage consists with the state of the magnetizing current, the tracking voltage is applied to at least one of zero-voltage switching (ZVS) control and quasi-resonant (QR) control of the power converter.

Abstract: A package applied to a flyback power converter includes a first lead frame and a second lead frame. The first lead frame connects to at least one component of a primary side of the flyback power converter. An isolation distance exists between the first lead frame and the second lead frame. The primary side of the flyback power converter is galvanically isolated from and communicates with a secondary side of the flyback power converter through capacitive coupling effect between the first lead frame and the second lead frame.

Abstract: A controller applied to a primary side of an inductor-inductor-capacitor (LLC) resonant converter includes a common-mode voltage generation circuit and a control signal generation circuit. The common-mode voltage generation circuit is used for generating a common-mode voltage. The control signal generation circuit is used for generating an upper bridge switch control signal and a lower bridge switch control signal according to a compensation voltage corresponding to an output voltage of the LLC resonant converter, a sensing voltage corresponding to an input voltage of the LLC resonant converter, and the common-mode voltage, wherein the upper bridge switch control signal and the lower bridge switch control signal control an upper bridge switch and a lower bridge switch of the primary side of the LLC resonant converter, respectively.

Abstract: A connector controller controls a connector with a power pin, a communication pin, and a ground pin. The connector detects the voltage at the communication pin at least twice to generate first and second voltages respectively. A bus power is supplied at the power pin. The first voltage is detected when a bus current to/from the bus power is about zero. The connector controller controls the bus power in response to a difference between the first and second voltage.

Abstract: The invention discloses a control method in use of a synchronous rectifier controller, controlling a synchronous rectifier in a power supply supplying power a load. The synchronous rectifier is turned ON in response to a terminal signal of the synchronous rectifier. An ON-time of the synchronous rectifier is made not less than a minimum ON-time. A detection result in association with the load is provided, for determining the minimum ON-time. The minimum ON-time is a first period when the detection result indicates the load as a first load, and a second period, shorter than the first period, when the detection result indicates the load as a second load heavier than the first load.

Abstract: A control method of a flyback power converter includes a voltage detection pin detecting conduction time of a power switch of a primary side of the flyback power converter, a feedback pin detecting conduction time of a synchronous switch of a secondary side of the flyback power converter, the feedback pin detecting a number of inductor capacitor resonant valleys when the flyback power converter operates in a discontinuous conduction mode, and a high voltage detection pin detecting an input voltage inputted in the flyback power converter; and a controller applied to the flyback power converter making the flyback power converter operate in a quasi-resonant mode when the number of the inductor capacitor resonant valleys is greater than a predetermined number, an operational frequency of the flyback power converter is less than a predetermined frequency, and the input voltage is less than a predetermined voltage.

Abstract: A power supply has multiple DC power sources converted from an AC power source. The power supply has an isolated converter converting the AC power source into an intermediate DC power source, and non-isolated converters converting the intermediate DC power source into the DC power sources, regulated at target output values respectively. A communication channel connects the isolated converter and one of the non-isolated converters, and transmits a feedback signal in association with the target output values. The isolated converter, in response to the feedback signal, regulates the intermediate DC power source at an intermediate target value related to the target output values.

Abstract: Asymmetric power converter includes an upper bridge switch, a lower bridge switch, a primary winding, a first secondary winding, a second secondary winding, a control circuit. The first secondary winding and the second secondary winding output a first output voltage and a second output voltage of a secondary side of the asymmetric power converter respectively, and voltage polarity of the first secondary winding is different from voltage polarity of the second secondary winding. The control circuit controls the lower bridge switch and the upper bridge switch according to the first output voltage and the second output voltage, respectively.

Abstract: A control method of a flyback power converter includes a voltage detection pin detecting conduction time of a power switch of a primary side of the flyback power converter, a feedback pin detecting conduction time of a synchronous switch of a secondary side of the flyback power converter, the feedback pin detecting a number of inductor capacitor resonant valleys when the flyback power converter operates in a discontinuous conduction mode, and a high voltage detection pin detecting an input voltage inputted in the flyback power converter; and a controller applied to the flyback power converter making the flyback power converter operate in a quasi-resonant mode when the number of the inductor capacitor resonant valleys is greater than a predetermined number, an operational frequency of the flyback power converter is less than a predetermined frequency, and the input voltage is less than a predetermined voltage.

Abstract: An efficiency tracking method of a controller applied to a flyback power converter includes before the controller soft starts, an original frequency variation curve setting voltage generated by the controller outputting an original frequency variation curve setting detection current to an original frequency variation curve setting detection resistor determining a frequency variation curve of the flyback power converter, and utilizing adjustment of resistance of the original frequency variation curve setting detection resistor to achieve efficiency optimization. Therefore, the controller controls an output voltage of the flyback power converter and tracks a maximum power point of the flyback power converter according to the efficiency tracking method to achieve efficiency optimization.

Abstract: A power factor correction (PFC) controller applied to a primary side of a power converter includes a feedback pin, a sensing pin, a current detecting circuit, an output voltage detecting circuit, and a determination circuit. The current detecting circuit is coupled to the feedback pin and the sensing pin for detecting an output current of a secondary side of the power converter according to a feedback voltage of the feedback pin and a sensing voltage of the sensing pin. The output voltage detecting circuit is coupled to the feedback pin for detecting an output voltage of the secondary side of the power converter according to the feedback voltage. The determination circuit is coupled to the current detecting circuit and the output voltage detecting circuit for turning on or turning off a PFC circuit coupled to the power converter according to the output current and the output voltage.

Abstract: The invention discloses a control method in use of a synchronous rectifier controller, controlling a synchronous rectifier in a power supply supplying power a load. The synchronous rectifier is turned ON in response to a terminal signal of the synchronous rectifier. An ON-time of the synchronous rectifier is made not less than a minimum ON-time. A detection result in association with the load is provided, for determining the minimum ON-time. The minimum ON-time is a first period when the detection result indicates the load as a first load, and a second period, shorter than the first period, when the detection result indicates the load as a second load heavier than the first load.

Abstract: A controller applied to a primary side of an inductor-inductor-capacitor (LLC) resonant converter includes a common-mode voltage generation circuit and a control signal generation circuit. The common-mode voltage generation circuit is used for generating a common-mode voltage. The control signal generation circuit is used for generating an upper bridge switch control signal and a lower bridge switch control signal according to a compensation voltage corresponding to an output voltage of the LLC resonant converter, a sensing voltage corresponding to an input voltage of the LLC resonant converter, and the common-mode voltage, wherein the upper bridge switch control signal and the lower bridge switch control signal control an upper bridge switch and a lower bridge switch of the primary side of the LLC resonant converter, respectively.

Abstract: A power supply is configured to limit its output power, converting an input voltage on a primary side into a bus voltage on a secondary side. A current-sense resistor detects a bus current output from the power supply to provide a current-sense signal. A bus switch is electrically connected to a secondary winding on the secondary side, configured to selectively supply power to the bus voltage. A power delivery controller controls the bus switch in response to the current-sense signal and a power detection signal on the secondary side. The power delivery controller provides a power threshold in response to the bus voltage, compares the power detection signal with the power threshold, and turns off the bus switch to stop supplying power to the bus voltage if the power detection signal exceeds the power threshold, thereby limiting the output power of the power supply.

Abstract: A connector controller controls a connector with a power pin, a communication pin, and a ground pin. The connector detects the voltage at the communication pin at least twice to generate first and second voltages respectively. A bus power is supplied at the power pin. The first voltage is detected when a bus current to/from the bus power is about zero. The connector controller controls the bus power in response to a difference between the first and second voltage.

Abstract: A PFC circuit uses a single multifunctional node to detect an inductor current when a power switch is turned ON and a zero-current moment when the power switch is turned OFF. The power switch has a drain connected to an inductor, a source connected to a current-sense resistor, and a gate controlled by a PFC controller with the multifunctional node. A signal-integration circuit is electrically coupled between the drain and the source, to provide a multifunctional signal at the multifunctional node. The PFC controller comprises a first comparator and a zero-current detector. The first comparator compares the multifunctional signal with a first reference signal when the PFC controller turns ON the power switch, to provide over-current protection. The zero-current detector decides, in response to the multifunctional signal when the PFC controller turns OFF the power switch, a zero-current moment when an inductor current flowing through the inductor is about zero.

Abstract: Asymmetric power converter includes an upper bridge switch, a lower bridge switch, a primary winding, a first secondary winding, a second secondary winding, a control circuit. The first secondary winding and the second secondary winding output a first output voltage and a second output voltage of a secondary side of the asymmetric power converter respectively, and voltage polarity of the first secondary winding is different from voltage polarity of the second secondary winding. The control circuit controls the lower bridge switch and the upper bridge switch according to the first output voltage and the second output voltage, respectively.

Abstract: A power supply is configured to limit its output power, converting an input voltage on a primary side into a bus voltage on a secondary side. A current-sense resistor detects a bus current output from the power supply to provide a current-sense signal. A bus switch is electrically connected to a secondary winding on the secondary side, configured to selectively supply power to the bus voltage. A power delivery controller controls the bus switch in response to the current-sense signal and a power detection signal on the secondary side. The power delivery controller provides a power threshold in response to the bus voltage, compares the power detection signal with the power threshold, and turns off the bus switch to stop supplying power to the bus voltage if the power detection signal exceeds the power threshold, thereby limiting the output power of the power supply.