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: 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 power supply device includes a rectifier module, an excitation module, a switch module, a transformer module, a first output module, a second output module, a control module and a logic module. The first and second output modules receive first and second transformed voltages of the transformer module to generate first and second output voltages. The control module determines whether the first output voltage is abnormal according to first and second slopes of the first and second output voltages. When the first output voltage is abnormal, the control module generates a comparison result according to the first slope and a reference slope. The logic module generates a logic signal according to a reference voltage, the first output voltage and the comparison result. The control module controls the power supply device to enter a short current protection or a under voltage protection according to the logic signal.

Abstract: A power supply includes a noise suppression circuit, an active power factor correction circuit, an active clamp flyback conversion circuit, a voltage-stabilizing feedback compensation circuit, and a control circuit. The active power factor correction circuit and the active clamp flyback conversion circuit convert an AC voltage into an output voltage for driving a load. The voltage-stabilizing feedback compensation circuit performs voltage-stabilizing feedback compensation to the output voltage. The active clamp flyback conversion circuit switches its operational mode based on the instantaneous output loading of the power supply.

Abstract: A power supply device includes a rectifier module, an excitation module, a switch module, a transformer module, a first output module, a second output module, a control module and a logic module. The first and second output modules receive first and second transformed voltages of the transformer module to generate first and second output voltages. The control module determines whether the first output voltage is abnormal according to first and second slopes of the first and second output voltages. When the first output voltage is abnormal, the control module generates a comparison result according to the first slope and a reference slope. The logic module generates a logic signal according to a reference voltage, the first output voltage and the comparison result. The control module controls the power supply device to enter a short current protection or a under voltage protection according to the logic signal.

Abstract: A boost converter with the function of temperature adjustment includes a bridge rectifier, a first inductor, an absorption circuit, a power switch element, an output stage circuit, a feedback compensation circuit, and a detection and control circuit. The absorption circuit is coupled in parallel with the first inductor. The absorption circuit is selectively enabled or disabled according to the control voltage. The power switch element selectively couples the first inductor to the ground voltage according to the PWM (Pulse Width Modulation) voltage. The detection and control circuit generates the control voltage and adjusts the duty cycle of the PWM voltage according to a temperature-dependent voltage. The temperature-dependent voltage is related to the temperature of the first inductor.

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 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 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 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 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 supply device with high output stability includes a bridge rectifier, a first capacitor, a boost inductor, a first voltage divider circuit, a power switch element, a first output stage circuit, a second voltage divider circuit, a switch circuit, a transformer, a resonant capacitor, a second output stage circuit, and a detection and control circuit. The detection and control circuit can appropriately control the switch circuit according to a first divided voltage from the first voltage divider circuit, a second divided voltage from the second voltage divider circuit, and an output voltage from the second output stage circuit.

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 power supply device with high output stability includes a bridge rectifier, a first inductor, a first power switch element, a first output stage circuit, a transformer, a second power switch element, a second output stage circuit, a compensation circuit, an MCU (Microcontroller Unit), and a PD (Power Delivery) IC (Integrated Circuit). The PD IC generates a state voltage according to a communication voltage. The MCU operates in a normal mode or a burst mode according to the state voltage. In the normal mode, the MCU controls the second output stage circuit to provide an output voltage. In the burst mode, the MCU controls the compensation circuit to provide an output voltage.

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.