Abstract: A power supply includes a transformer, a power switch, a resonant circuit, a voltage stabilization and feedback compensation circuit, and two control circuits. The power switch operates according to a first control signal so that the transformer can convert an input voltage into an output voltage. The voltage stabilization and feedback compensation circuit provides a feedback voltage associated with the input voltage and lower the feedback voltage when receiving a fourth signal having an enable level. The first control circuit adjusts the duty cycle of the first control signal and provides the fourth signal having the enable level when receiving a detecting voltage having a specific level. The second control circuit provides second and third signals for driving the resonant circuit, detects the resonant voltages of the resonant circuit, and provides the detecting voltage having the specific level when determining that the resonant circuit fails to provide zero-voltage switching.

Abstract: A power supply device with a high efficiency includes a switch circuit, a transformer, a first capacitor, an output stage circuit, and a PWM (Pulse Width Modulation) IC (Integrated Circuit). The switch circuit generates a switching voltage according to an input voltage, a first PWM voltage, and a second PWM voltage. The transformer includes a main coil, a first secondary coil, and a second secondary coil. A leakage inductor and a magnetizing inductor are built into the transformer. The main coil receives the switching voltage through the leakage inductor. The output stage circuit is coupled to the first secondary coil and the second secondary coil, and is configured to generate an output voltage and an output current. The PWM IC selectively adjusts the switching frequency and duty cycle of the first PWM voltage according to the output current.

Abstract: A boost converter with the fast discharge function includes a bridge rectifier, a boost inductor, a power switch element, an output stage circuit, a detection and control circuit, a discharge circuit, and an MCU (Microcontroller Unit). The bridge rectifier generates a rectified voltage according to a first input voltage and a second input voltage. The boost inductor receives the rectified voltage. The power switch element selectively couples the boost inductor to a ground voltage according to a clock voltage. The output stage circuit is coupled to the boost inductor, and is configured to generate an output voltage. The detection and control circuit generates a control voltage according to the rectified voltage and the output voltage. The discharge circuit is coupled to the output stage circuit. The MCU generates the clock voltage. The MCU selectively enables or disables the discharge circuit according to the control voltage.

Abstract: A boost converter includes a bridge rectifier, a first capacitor, a supply circuit, a first inductor, a current compensation circuit, a power switch element, an output stage circuit, a feedback compensation circuit, and an MCU (Microcontroller Unit). The bridge rectifier generates a rectified voltage according to a first input voltage and a second input voltage. The first inductor receives the rectified voltage. The output stage circuit is coupled to the first inductor and the current compensation circuit, and generates an output voltage. The feedback compensation circuit generates a feedback voltage according to the output voltage. The MCU monitors and limits a duty cycle of a clock voltage. If the duty cycle reaches a maximum threshold value, the MCU will enable the current compensation circuit to provide an additional current, thereby increasing the output power of the boost converter.

Abstract: A power delivery system includes a PD source device and a PD sink device. The PD source device is configured to detect its connection status with the PD sink device and determine whether its power supply is high-voltage operation. When determining that the PD source device is supplying high-voltage power and detecting that the PD source device is detached from the PD sink device, the PD source device is configured to provide an oscillating rapid discharging path for its output capacitor, thereby rapidly reducing its output voltage and suppressing electrical arc.

Abstract: A power supply device for suppressing noise includes a first bridge rectifier, a second bridge rectifier, a coupling inductive element, a first power switch element, a first output stage circuit, a switch circuit, a transformer, a second output stage circuit, and an auxiliary control circuit. The first bridge rectifier and second bridge rectifier generate a first rectified voltage and a second rectified voltage according to a first input voltage and a second input voltage. The coupling inductive element receives the first rectified voltage and the second rectified voltage. The switch circuit generates a control voltage. The second output stage circuit generates an output voltage. The auxiliary control circuit includes a second power switch element. The second power switch element is coupled to the coupling inductive element, and is selectively enabled or disabled according to the control voltage.

Abstract: A power supply device for suppressing magnetic saturation includes a bridge rectifier, a boost inductor, a power switch element, a first PWM (Pulse Width Modulation) IC (Integrated Circuit), a first output stage circuit, an input switch circuit, a transformer, a first capacitor, a second output stage circuit, and a detection and control circuit. A leakage inductor and a magnetizing inductor are built in the transformer. The detection and control circuit includes an NTC (Negative Temperature Coefficient) resistor disposed adjacent to the transformer. The detection and control circuit detects the first voltage slope relative to the power switch element, and it detects the second voltage slope relative to the first output stage circuit. The detection and control circuit limits the inductive current flowing through the magnetizing inductor according to the first voltage slope, the second voltage slope, and the feedback voltage from the NTC resistor.

Abstract: Provided is a power supply including a boost circuit and an LLC converter. The LLC converter includes a first inductor, a first switch, and a second switch. The LLC converter controls the first switch and the second switch according to the zero-voltage switching rule, so as to convert a boosted power supply provided by the boost circuit to an output power. The first inductor is inductively coupled with a boost inductor of the boost circuit to obtain the first energy. In response to the first energy, a time point when a first terminal and a second terminal of the first switch have zero voltage difference is delayed, such that a turn-on time point of the second switch lags behind a turn-on time point of a power switch of the boost circuit.

Abstract: A boost converter is provided. The boost converter includes a boost inductor, a blocking diode, a power switch, an output diode, an output capacitor, and a first auxiliary path. A first terminal of the boost inductor receives a rectified voltage signal. An anode of the blocking diode is coupled to a second terminal of the boost inductor. The power switch is coupled between the cathode of the blocking diode and a reference low voltage. The anode of the output diode is coupled to the second terminal of the boost inductor. The cathode of the output diode serves as the output terminal of the boost converter. The output capacitor is coupled between the cathode of the output diode and the reference low voltage. When the power switch is turned off, the first auxiliary path is conducted to delay a discharge of the boost inductor.

Abstract: A power supply device for suppressing magnetic saturation includes a bridge rectifier, a boost inductor, a power switch element, a first PWM (Pulse Width Modulation) IC (Integrated Circuit), a first output stage circuit, an input switch circuit, a transformer, a first capacitor, a second output stage circuit, and a detection and control circuit. A leakage inductor and a magnetizing inductor are built in the transformer. The detection and control circuit includes an NTC (Negative Temperature Coefficient) resistor disposed adjacent to the transformer. The detection and control circuit detects the first voltage slope relative to the power switch element, and it detects the second voltage slope relative to the first output stage circuit. The detection and control circuit limits the inductive current flowing through the magnetizing inductor according to the first voltage slope, the second voltage slope, and the feedback voltage from the NTC resistor.

Abstract: A power supply including a first conversion circuit, a second conversion circuit, a first output capacitor, a second output capacitor, a first discharge circuit, and a second discharge circuit is provided. The first conversion circuit converts a first alternating current (AC) power to a first direct current (DC) power. The second conversion circuit converts a second AC power to a second DC power. The first output capacitor is configured to store the first DC power. The second output capacitor is configured to store the second DC power. The first discharge circuit provides a first discharge path to discharge the first output capacitor in response to the first DC power being greater than the second DC power. The second discharge circuit provides a second discharge path to discharge the second output capacitor in response to the second DC power being greater than the first DC power.

Abstract: The disclosure provides a full-bridge resonant converter, including a full-bridge switching circuit, a transformer, a resonance tank, a secondary side circuit, and a damping circuit. The secondary side circuit includes a first output diode and a second output diode. When the current value of a current flowing through the first output diode and the second output diode is resonated to zero amperes, and a resonant current flowing through the resonance tank does not flow through a primary side winding of the transformer at all, the transformer and the secondary side circuit jointly provide an equivalent capacitance, and the damping circuit and the equivalent capacitance jointly perform a damping operation on the resonant current.

Abstract: A resonance conversion device including an LLC synchronous resonance converter, a synchronous rectification controller, and a dead time adjustment circuit is provided. The LLC synchronous resonance converter includes a resonance tank and multiple synchronous rectification switches. The synchronous rectification controller controls the synchronous rectification switches, which are turned on with a delay based on a dead time length. The dead time adjustment circuit inductively couples electric energy at an output of the LLC synchronous resonance converter to the resonance tank, and provides a dead time control signal according to a resonance voltage variation of the resonance tank so that the synchronous rectification controller adjusts the dead time length according to the dead time control signal.

Abstract: A power supply device is provided. The power supply device includes a housing, a power converter, a controller, multiple humidity sensitive capacitors, and a feedback circuit. The housing has multiple joints. The controller controls the power converter to provide an output voltage. The humidity sensitive capacitors are respectively configured in the housing and adjacent to a corresponding joint of the joints. The humidity sensitive capacitors jointly provide a sensing capacitance value. The feedback circuit changes a gain value and a compensation bandwidth of the output voltage in response to the change of the sensing capacitance value. When the humidity of at least one of the joints increases, the sensing capacitance value is reduced, so that the gain value and the compensation bandwidth are reduced.

Abstract: A power converter and an operation method of the power converter are provided. The power converter includes a rectifier, a boost circuit, a current sensor, and a processor. The rectifier rectifies an AC power to generate a rectified power. The boost circuit includes a boost inductor. The boost circuit boosts the rectified power to generate an output power. The current sensor senses an inductor current value at the boost inductor to generate a sensed value corresponding to the inductor current value. The processor generates a first reference value according to an output voltage value of the output power, an input impedance value, and a first value. When the sensed value is greater than the first reference value, the processor enters a first operation mode to cause the sensed value to be not less than the first reference value.

Abstract: A power supply device for suppressing the surge includes a bridge rectifier, a first surge absorption circuit, a second surge absorption circuit, a third surge absorption circuit, and a boost converter. The bridge rectifier generates a rectified voltage according to a first input voltage and a second input voltage. The first surge absorption circuit receives the rectified voltage. The first surge absorption circuit is coupled to a ground. The second surge absorption circuit is coupled to the first surge absorption circuit. The third surge absorption circuit is coupled to the second surge absorption circuit. The third surge absorption circuit includes a transformer. The boost converter is coupled to the third surge absorption circuit, and generates an output voltage. The first surge absorption circuit provides a high impedance value. The second surge absorption circuit provides a median impedance value. The third surge absorption circuit provides a low impedance value.

Abstract: A charging device supporting PD (Power Delivery) includes a bridge rectifier, a first capacitor, a transformer, a power switch element, an output stage circuit, a feedback compensation circuit, a PWM (Pulse Width Modulation) IC (Integrated Circuit), a discharging circuit, and a controller. The bridge rectifier generates a rectified voltage according to a first input voltage and a second input voltage. The transformer includes a main coil and a secondary coil. The main coil receives the rectified voltage, and the secondary coil generates an induced voltage. The output stage circuit generates an output voltage according to the induced voltage and a first control voltage. The controller generates the first control voltage and a second control voltage according to the output voltage. The discharging circuit selectively reduces the voltage level of the output voltage according to the second control voltage.

Abstract: A boost converter for improving output stability includes a transformer, a detection circuit, a first resistor, a power switch element, an output stage circuit, a feedback compensation circuit, a controller, an inverter, and a multiplier. The transformer includes a main coil and a secondary coil. The main coil receives an input voltage. The detection circuit is coupled to the secondary coil. The detection circuit generates a detection voltage. The first resistor is coupled to the main coil. The output stage circuit generates an output voltage. The feedback compensation circuit generates a feedback voltage according to the output voltage. The inverter generates an inverted oscillation voltage. The multiplier generates a compensation voltage difference according to the detection voltage, the inverted oscillation voltage, and the feedback voltage. The compensation voltage difference is applied to the first resistor.

Abstract: A power factor calibration circuit includes a multiplier, a boost inductor, an auxiliary winding, a detection resistor, a compensation capacitor, a comparator, and an auxiliary switch. The comparator is configured to detect inductor current flowing through the boost inductor. When the detected inductor current is too small, the energy stored in the compensation capacitor is transmitted to the auxiliary winding for generating compensation current, thereby enhancing the level of the inductor current.

Abstract: A power supply device for eliminating overcurrent protection malfunctions includes a first transformer, a power switch element, an output stage circuit, a detection circuit, a feedback compensation circuit, a PWM (Pulse Width Modulation) IC (Integrated Circuit), a second transformer, and a control circuit. The first transformer generates an induced voltage according to an input voltage. The output stage circuit generates an output current according to the induced voltage. The detection circuit monitors the output current and generates a detection voltage according to the output current. The feedback compensation circuit includes a linear optical coupler and a voltage regulator. The feedback compensation circuit generates a coupling current. The second transformer generates a control voltage according to the coupling current. The control circuit selectively enables or disables the linear optical coupler and the voltage regulator according to the detection voltage and the control voltage.