Abstract: The present invention provides a power controller, an asymmetric half-bridge power supply, and a control method, which are related to the field of electronic technology. The asymmetric half-bridge includes a charging switch and a resonant switch that constitute a half-bridge. The charging switch and the resonant switch are used to control the resonant circuit, which includes a transformer and a resonant capacitor. The asymmetric half-bridge power supply is used to provide an output voltage and to supply power to a load. The control method includes: providing a compensation signal based on the output voltage; turning on the charging switch for a charging switch turn-on duration; turning on the resonant switch for a resonant switch turn-on duration; and adjusting the resonant switch turn-on duration based on the compensation signal, so that the resonant switch turn-on duration increases as the load decreases.

Abstract: A switch-mode power supply is used to provide an output voltage and includes an inductor and a power switch, where the power switch is used to control the current flowing through the inductor. A control method for the switch-mode power supply includes: providing a compensation signal controlled by the output voltage; providing a stable compensation signal for the low-frequency component of the compensation signal based on the compensation signal; providing a mixed operation mode, in which the switch-mode power supply alternately operates during a switching operation period and an skip period, the power switch opens at least once during the switching operation period, and the power switch is closed during the skip period; based on the difference between the compensation signal and the stable compensation signal, ending one of the switching operation period and skip period, and starting another one of the switching operation period and skip period.

Abstract: A semiconductor device includes a substrate of first conductive type and an epitaxial layer; a first trench in the epitaxial layer; a first gate electrode structure in the first trench; a body region and the doped region of second conductivity type in the epitaxial layer, the body region is spaced apart from the first gate dielectric layer of the first gate electrode structure, the doped region is separated from the body region by the epitaxial layer and is contiguous with the first gate dielectric layer; a first electrode region of first conductivity type in the body region; a third gate structure on a top surface of the epitaxial layer, including a third gate and a third gate dielectric layer, the third gate structure partially overlaps the first gate dielectric layer and partially overlaps the body region; and a second electrode.

Abstract: A semiconductor device includes a substrate with first conductivity type and an epitaxial layer; a first trench and a second trench in the epitaxial layer, the depth of the first trench being greater than that of the second trench; a first gate structure including a first gate in the first trench and a first gate dielectric layer; a second gate structure including a second gate in the second trench and a second gate dielectric layer between the second gate and the epitaxial layer; a body region with second conductivity type being spaced apart from the first gate dielectric layer and being contiguous with the second gate dielectric layer; a first electrode region having first conductivity type; a third gate structure on the epitaxial layer and partially overlapping with the body region; and a second electrode. The Avalanche Energy, Single Pulse (EAS) durability of the semiconductor device is improved.

Abstract: A synchronized rectification control method for use in a flyback converter is provided. The flyback converter includes a transformer including a secondary winding, a synchronous rectifier switch and a synchronous rectifier controller. The synchronous rectifier switch is coupled to the secondary winding and the synchronous rectifier controller, and is used to output a voltage difference signal and receive a control voltage. The method includes the synchronous rectifier controller detecting a rapid falling edge of the voltage difference signal to generate a rapid falling edge signal, generating an envelope signal according to the voltage difference signal, generating a time length control signal according to the voltage difference signal and the envelope signal, generating a blanking time signal according to the voltage difference signal and the time length control signal, and performing a logic operation on the blanking time signal and the rapid falling edge signal to generate the control voltage.

Abstract: A charging system includes a primary power source, a power source controller coupled to the primary power source, a first switch, a third switch, and a first port. The power source controller includes an auxiliary power source, a first auxiliary power terminal coupled to the auxiliary power source for providing a first detection current, and a load detection circuit. The power source controller initially sets the first switch to be off, the third switch to be on, and the first auxiliary power terminal to provide the first detection current to the first port through the third switch. When the first detection current is less than a threshold value, the power source controller maintains the first switch to be off, the third switch to be on, and the first auxiliary power terminal to provide the first detection current through the third switch.

Abstract: A controller and a control method for an asymmetric half-bridge power supply are disclosed. The asymmetric half-bridge power supply includes a first arm switch and a second arm switch forming a half-bridge, and a resonant circuit connected to the half-bridge. The method includes providing a duration parameter reflecting a second turn-on time of the second arm switch in a earlier switching cycle; providing a control signal to turn on the first arm switch for a first turn-on time in a later switching cycle; detecting whether the first arm switch has performed ZVS in response to a signal edge of the control signal to adjust the duration parameter accordingly; determining the second turn-on time of the second arm switch in the later switching cycle based on the duration parameter; and turning on the second arm switch for the second turn-on time after the first turn-on time in the later switching cycle.

Abstract: A current detection circuit includes a processing circuit used to operate during each switch cycle which includes a first period and a second period. A cycle detecting current is provided based on the terminal voltage established on a first end of a capacitor. The terminal voltage established on the first end of the capacitor is increased during the first period using a constant current. The terminal voltage established on the first end of the capacitor varies with a low-side detecting current during the second period.

Abstract: An asymmetrical half-bridge converter has an auxiliary winding, a main switch and a resonant switch. The auxiliary winding generates a feedback voltage. A controller turns on the main switch for a first ON duration, turns off the main switch and the resonant switch for a first OFF duration after the first ON duration, turns on the resonant switch for a second ON duration after the first OFF duration, turns off the main switch and the resonant switch for a second OFF duration after the second ON duration, turns on the resonant switch for a third ON duration after the second OFF duration, and turns off the main switch and the resonant switch for a third OFF duration after the third ON duration. The length of the second ON duration is a fixed ratio of a discharge period, and the fixed ratio is less than 1.

Abstract: A control method is disclosed for an asymmetric half-bridge power supply having a resonant circuit, a first switch, a second switch, and an assisting switch. The resonant circuit includes a transformer and a resonance capacitor. The transformer has a primary winding connected to the resonance capacitor and an auxiliary winding connected to the assisting switch. Within a switching cycle, the first switch is turned on for a first ON time to increase an exciting current of the transformer. After the first ON time, the second switch is turned on for a second ON time to decrease the exciting current. Whether a discharge duration of the transformer ends is detected. The assisting switch is turned ON after the end of the discharge duration, making the exciting current negative, so as to assist the first switch achieving ZVS.

Abstract: A control circuit of a power conversion circuit includes an energy storing circuit coupled between an AC/DC rectifier circuit and a DC/DC conversion circuit. When a first condition “the absolute peak value of the input voltage of the AC/DC rectifying circuit is smaller than a reference voltage” is satisfied, discharge current is provided for lowering the voltage on the first output end of the AC/DC rectifying circuit. When the first condition and a second condition “the discharge current is smaller than reference current” are both satisfied, a switch of the energy storing circuit is turned on. When the first condition and the second are not both satisfied, the switch of the energy storing circuit is turned off.

Abstract: A flyback converter includes a primary winding, a main switch, a charging switch, a primary side controller and an energy storage device. The primary winding receives an input power; the primary side controller has a power input terminal and provides a first control signal and a second control signal to the main switch and the charging switch; after the main switch is turned off, the charging switch maintains turned on during a charging period. During the charging period, the input power passes through the primary winding and the charging switch, and stores a first portion of the input power in the energy storage device as a power supply energy; the power input terminal is coupled to the energy storage device, and the primary side controller receives the power supply power from the energy storage device through the power input terminal.

Abstract: A power conversion circuit, a power conversion system, a power source and a method and a device of controlling the same are provided. The power conversion circuit includes an AC/DC rectifier circuit, a DC/DC conversion circuit and an energy storing circuit coupled between the AC/DC rectifier circuit and the DC/DC conversion circuit. The energy storing circuit includes a first capacitor, a second capacitor and a switch. The first capacitor and the second capacitor are coupled in series. The switch is coupled in parallel with the second capacitor. The switch is configured to turn on when the output voltage of the AC/DC rectifier circuit is smaller than or equal to a threshold value; and turn off when the output voltage of the AC/DC rectifier circuit is larger than the threshold value, wherein the threshold value is smaller than or equal to the rated voltage of the first capacitor.

Abstract: A power conversion apparatus supplies power to a load, and the power conversion apparatus includes a power switch, a transformer, and a control module. The control module alternately turns on and turns off a power switch of the power conversion apparatus to convert an input voltage into an output voltage through the transformer. When the power switch is turned off, a primary side of the transformer generates a resonance voltage. The control module sets a predetermined counting threshold according to the output voltage, and sets a blanking time interval according to a feedback signal related to the load. After the blanking time interval ends, the control module counts a number of an oscillation turning point generated by the resonance voltage due to the oscillation of the resonance voltage. When the number reaches the predetermined counting threshold, the control module turns on the power switch.

Abstract: A voltage supply circuit includes a charging circuit, a window adjustment circuit, a driving voltage adjustment circuit, a sampling and feedback circuit and a storage circuit. The charging circuit includes a modulation input terminal for receiving a control voltage; and an energy supply terminal for selectively outputting a charging energy according to the control voltage. The window adjustment circuit is used to adjust the control voltage according to a sampling output voltage corresponding to an output voltage signal, and output the control voltage. The driving voltage adjustment circuit is used to keep the control voltage within a clamping voltage according to the output voltage signal. The sampling and feedback circuit is used to generate the output voltage signal according to a voltage at the energy supply terminal. The storage circuit is used to store the charging energy to pull up the voltage at the energy supply terminal.