Abstract: A controller for controlling a blocking switch of a power converter is provided. The controller includes a control pin and a sensing circuit. The control pin is coupled to a control terminal of the blocking switch and an output terminal of the blocking switch. The sensing circuit includes a control switch and a judgment circuit. A first terminal of the control switch is coupled to the control pin. A second terminal of the control switch is coupled to a reference low voltage. The judgment circuit turns on the control switch during a period when the blocking switch is turned off to obtain a sensing current value of a current flowing through the control switch. When the sensing current value is lower than a reference current value, the judgment circuit provides a notification signal for allowing the blocking switch to be turned on.

Abstract: A controller for controlling a blocking switch of a power converter is provided. The controller includes a control pin and a sensing circuit. The control pin is coupled to a control terminal of the blocking switch and an output terminal of the blocking switch. The sensing circuit includes a control switch, a variable resistance circuit, and a judgment circuit. A first terminal of the control switch is coupled to the control pin. The variable resistance circuit is coupled between a second terminal of the control switch and a reference low voltage. The judgment circuit controls the variable resistance circuit to provide a detection resistance value with a minimum value, and turns on the control switch to obtain a sensing voltage value. When the detection resistance value has a maximum value and the sensing voltage value is lower than a reference voltage value, the judgment circuit provides a notification signal.

Abstract: A synchronous rectifier device for a power converter is provided. A power converter includes at least one secondary circuit and a transformer. The synchronous rectifier device includes a synchronous rectification circuit and a controller. The synchronous rectification circuit includes a synchronous rectification switch and a current receiving circuit. The synchronous rectification switch is coupled between the secondary circuit and a secondary winding of the transformer. The current receiving circuit provides a current signal based on a current flowing through the synchronous rectification switch. The controller controls the synchronous rectification switch according to the current signal. In a case that the synchronous rectification switch is turned off, when the current signal indicates that a current value of the current is greater than a predetermined value, the controller turns on the synchronous rectification switch.

Abstract: A control circuit for a synchronous rectification switch of a power converter is provided. The synchronous rectification switch and a transformer of the power converter are coupled to a connection node. The control circuit includes a first logic circuit, an integrating circuit, a setting comparator, a logic gate, and a second logic circuit. The first logic circuit provides a detection signal according to a detection voltage on the connection node. The integrating circuit performs an accumulation operation on the integrated voltage value based on the detection signal to generate a setting pulse. The setting comparator provides a comparison signal according to the detection voltage and a first predetermined voltage. The logic gate outputs a setting signal according to the setting pulse and the comparison signal. The second logic circuit continuously provides a turn-on control signal in response to the setting signal. The synchronous rectification switch is turned on in response to the turn-on control signal.

Abstract: A power conversion device and a control circuit are provided. The power conversion device includes a power conversion circuit and a control circuit. The control circuit includes a first controller and a second controller. The power conversion circuit includes an input capacitor, a rectifier circuit, and a power switch. The input capacitor is coupled to an input terminal of the power conversion device. The rectifier circuit converts an input AC power into a rectified power. The first controller operates the power switch to cause the power conversion circuit to convert the rectified power into an output power. The second controller detects a signal waveform at the input terminal, and controls the first controller in response to the signal waveform at the input terminal, so as to utilize the power switch to discharge the charge stored in the input capacitor.

Abstract: A feedback circuit is used for a power supply device. The power supply device includes a primary side circuit and a secondary side circuit. The feedback circuit includes a feedback voltage generation circuit, a base voltage generation circuit, and a compensation signal generation circuit. The feedback voltage generation circuit is electrically connected to the secondary side circuit. The feedback voltage generation circuit generates a feedback voltage according to a bias voltage and an output voltage of the power supply device. The base voltage generation circuit generates a base voltage according to the feedback voltage. The compensation signal generation circuit generates a compensation signal according to the feedback voltage and the base voltage and provides the compensation signal to a controller in the primary side circuit. A voltage value of the feedback voltage is lower than a voltage value of the bias voltage. The voltage value of the feedback voltage varies with the change of the output voltage.

Abstract: A detection circuit for a power supply circuit is provided. The detection circuit includes a reference circuit, a voltage detection circuit, and a determination circuit. The reference circuit is coupled to a thermal circuit of the power supply circuit through a connection pin. The voltage detection circuit stops the reference circuit from providing a temperature reference signal, and samples a single-phase AC input power through the connection pin. When a peak value information of the single-phase AC input power is sampled, the voltage detection circuit stores the peak value information and enables the reference circuit to provide the temperature reference signal. The determination circuit provides at least one of a waveform detection signal and an over-voltage detection signal in response to the peak value information, and provides an over-temperature detection signal according to at least one of an output signal of the thermal circuit and the peak value information.

Abstract: A controller for a power supply device includes a transmission terminal, first and second memory circuits, a determining circuit, and a control circuit. The determining circuit generates a first mode signal when an input voltage value is lower than a reference voltage value and generates a second mode signal when the input voltage value is greater than or equal to the reference voltage value. The control circuit enters a first mode and a second mode in response to the first mode signal and the second mode signal, respectively. The control circuit writes a control parameter from the transmission terminal into the first memory circuit in the first mode and uses the control parameter in the second mode to test the power supply device. When the control parameter meets an expected function of the power supply device, the control circuit writes the control parameter into the second memory circuit.

Abstract: A power supply apparatus and a discharge method thereof are provided. A control unit detects a cross-voltage across two ends of an AC safety capacitor to generate a detection voltage, compares the detection voltage with a threshold voltage, counts the number of cycles of the detection voltage during a period when the detection voltage does not cross the threshold voltage according to a comparison result between the detection voltage and the threshold voltage, and performs a discharge operation when the number of cycles is greater than or equal to a predetermined value to discharge electric energy stored in the AC safety capacitor.

Abstract: A detection circuit for a power supply circuit is provided. The detection circuit includes a reference circuit, a voltage detection circuit, and a determination circuit. The reference circuit is coupled to a thermal circuit of the power supply circuit through a connection pin. The voltage detection circuit stops the reference circuit from providing a temperature reference signal, and samples a single-phase AC input power through the connection pin. When a peak value information of the single-phase AC input power is sampled, the voltage detection circuit stores the peak value information and enables the reference circuit to provide the temperature reference signal. The determination circuit provides at least one of a waveform detection signal and an over-voltage detection signal in response to the peak value information, and provides an over-temperature detection signal according to at least one of an output signal of the thermal circuit and the peak value information.

Abstract: A power supply device is provided. The power supply device includes a power converter and a controller. The controller controls the power converter to generate an output power. The controller includes a first detection circuit and a second detection circuit. The first detection circuit detects the output power to obtain a first detection result. The first detection result is a variation of an output current value of the output power. The second detection circuit detects electrical characteristics other than the output current value to obtain a second detection result. The controller determines whether to limit output of the output power according to a relationship between the first detection result and the second detection result.

Abstract: An asymmetric half-bridge converter is provided. The asymmetric half-bridge converter includes a switch circuit, a resonance tank, a current sensor, and a controller. The current sensor senses a waveform of a resonance current flowing through the resonance tank to generate a sensing result. The controller determines the sensing result. When the sensing result indicates that an ending current value of a primary resonance waveform of the resonance current is greater than a predetermined value, the controller performs a first switching operation on the switch circuit. When the sensing result indicates that the ending current value of the primary resonance waveform is less than or equal to the predetermined value, the controller performs a second switching operation on the switch circuit.

Abstract: A power conversion device and a control circuit are provided. The power conversion device includes a power conversion circuit and a control circuit. The control circuit includes a first controller and a second controller. The power conversion circuit includes an input capacitor, a rectifier circuit, and a power switch. The input capacitor is coupled to an input terminal of the power conversion device. The rectifier circuit converts an input AC power into a rectified power. The first controller operates the power switch to cause the power conversion circuit to convert the rectified power into an output power. The second controller detects a signal waveform at the input terminal, and controls the first controller in response to the signal waveform at the input terminal, so as to utilize the power switch to discharge the charge stored in the input capacitor.

Abstract: A power supply apparatus and an impedance adjustment method thereof are provided. An adjustment control circuit controls an impedance adjustment circuit to adjust an equivalent impedance of a feedback circuit according to variation of an output voltage of a power supply circuit, to adjust a feedback voltage in response to the variation of the output voltage.

Abstract: A power conversion apparatus and a synchronous rectification controller thereof are provided. At least one of a differentiation operation and an integration operation is performed on a drain voltage signal of a synchronous rectification transistor. According to at least one of a differential signal obtained by performing the differential operation and an integral signal obtained by performing the integral operation, it is determined whether to turn on the synchronous rectification transistor at the next time when the drain voltage signal is less than or equal to a turn-on threshold voltage.

Abstract: An asymmetric half-bridge converter is provided. The asymmetric half-bridge converter includes a switch circuit, a resonance tank, a current sensor, and a controller. The current sensor senses a waveform of a resonance current flowing through the resonance tank to generate a sensing result. The controller determines the sensing result. When the sensing result indicates that an ending current value of a primary resonance waveform of the resonance current is greater than a predetermined value, the controller performs a first switching operation on the switch circuit. When the sensing result indicates that the ending current value of the primary resonance waveform is less than or equal to the predetermined value, the controller performs a second switching operation on the switch circuit.

Abstract: A power supply device is provided. The power supply device includes a power converter and a controller. The controller controls the power converter to generate an output power. The controller includes a first detection circuit and a second detection circuit. The first detection circuit detects the output power to obtain a first detection result. The first detection result is a variation of an output current value of the output power. The second detection circuit detects electrical characteristics other than the output current value to obtain a second detection result. The controller determines whether to limit output of the output power according to a relationship between the first detection result and the second detection result.

Abstract: A power conversion apparatus and a synchronous rectification controller thereof are provided. At least one of a differentiation operation and an integration operation is performed on a drain voltage signal of a synchronous rectification transistor. According to at least one of a differential signal obtained by performing the differential operation and an integral signal obtained by performing the integral operation, it is determined whether to turn on the synchronous rectification transistor at the next time when the drain voltage signal is less than or equal to a turn-on threshold voltage.

Abstract: An LLC converter circuit is provided. A control circuit provides a first control signal and a second control signal according to a sensing voltage generated by sensing a voltage on a resonant capacitor of a primary side, so as to control a conduction state of a half-bridge switch circuit.

Abstract: A power conversion apparatus and a synchronous rectification (SR) controller thereof are provided. An open-loop control circuit outputs a clamp voltage as a driving voltage when a drain voltage of a synchronous rectification transistor rises to a second voltage, so as to quickly pull down the driving voltage and maintain the driving voltage at a clamp voltage. Therefore, a second control circuit may quickly turn off the synchronous rectification transistor when the drain voltage is greater than a third voltage.