Abstract: A voltage stabilizing circuit includes an input capacitor, a booster circuit having an input side coupled across the input capacitor, a first output capacitor coupled to an output side of the booster circuit, and a series connection of a first power switch and a second output capacitor coupled between two terminals of the first output capacitor. The first power switch has a terminal coupled to one terminal of the first output capacitor. The second output capacitor has a first terminal coupled to the other terminal of the first power switch at a common node, and a second terminal coupled to the other terminal of the first output capacitor. A second power switch is coupled between the input capacitor and the common node.

Abstract: A voltage stabilizing circuit includes an input capacitor, a booster circuit having an input side coupled across the input capacitor, a first output capacitor coupled to an output side of the booster circuit, and a series connection of a first power switch and a second output capacitor coupled between two terminals of the first output capacitor. The first power switch has a terminal coupled to one terminal of the first output capacitor. The second output capacitor has a first terminal coupled to the other terminal of the first power switch at a common node, and a second terminal coupled to the other terminal of the first output capacitor. A second power switch is coupled between the input capacitor and the common node.

Abstract: An alternating current (AC)/direct current (DC) adaptor is to be coupled electrically with an electronic device having an electrical property, and includes a DC/DC converter that receives a DC voltage signal and a control signal, and that adjusts the DC voltage signal according to the control signal to obtain an output DC voltage signal. A device discriminator receives the output DC voltage signal, and generates, according to the output DC voltage signal and the electrical property, a device indication signal set. A controller obtains a target value according to the device indication signal set, and outputs the control signal according to an initial value or the target value to control voltage value of the output DC voltage signal provided to the electronic device.

Abstract: A control method is provided for controlling an asymmetric DC-DC converter including first and second power switches that are driven respectively by first and second control signals, and a voltage-converting circuit that is operatively associated with the first and second power switches for generating an output signal. The voltage-converting circuit includes a primary coil unit and a secondary coil unit operatively associated therewith for voltage conversion, and including first and second coils that have a turn ratio not equal to one. The control method includes: sampling the output signal to obtain a sample signal corresponding thereto; and generating the first and second control signals, which correspond respectively to first and second duty cycles having a sum of one, based on a comparison between the sample signal and a reference signal such that the first and second power switches are driven in an alternating manner.

Abstract: An alternating current (AC)/direct current (DC) adaptor is to be coupled electrically with an electronic device having an electrical property, and includes a DC/DC converter that receives a DC voltage signal and a control signal, and that adjusts the DC voltage signal according to the control signal to obtain an output DC voltage signal. A device discriminator receives the output DC voltage signal, and generates, according to the output DC voltage signal and the electrical property, a device indication signal set. A controller obtains a target value according to the device indication signal set, and outputs the control signal according to an initial value or the target value to control voltage value of the output DC voltage signal provided to the electronic device.

Abstract: A control method is provided for controlling an asymmetric DC-DC converter including first and second power switches that are driven respectively by first and second control signals, and a voltage-converting circuit that is operatively associated with the first and second power switches for generating an output signal. The voltage-converting circuit includes a primary coil unit and a secondary coil unit operatively associated therewith for voltage conversion, and including first and second coils that have a turn ratio not equal to one. The control method includes: sampling the output signal to obtain a sample signal corresponding thereto; and generating the first and second control signals, which correspond respectively to first and second duty cycles having a sum of one, based on a comparison between the sample signal and a reference signal such that the first and second power switches are driven in an alternating manner.

Abstract: A controller is adapted for controlling a switch of a resonant direct current/direct current converter, and includes: a pulse width modulation controlling unit for detecting an output voltage of the resonant direct current/direct current converter, and for generating a pulse width modulation signal according to the output voltage detected thereby; a fixed frequency signal generating unit for generating a fixed frequency signal; and a logic synthesizing unit for synthesizing the pulse width modulation signal and the fixed frequency signal so as to generate a driving signal that is adapted to drive the switch of the resonant direct current/direct current converter.

Abstract: A control device for controlling a switch unit of a resonant direct current/direct current converter includes a frequency modulation controller and a pulse selector. The frequency modulation controller is adapted to be coupled electrically to the converter for receiving a correcting threshold value and output information of the converter, and for generating a synchronization signal according to the correcting threshold value and the output information received thereby. The pulse selector is adapted to be coupled electrically to the converter and the frequency modulation controller for receiving the correcting threshold value, the output information and the synchronization signal, and for generating a driving signal according to the correcting threshold value, the output information and the synchronization signal received thereby. The driving signal is adapted to drive the switch unit and has a working period.

Abstract: A control device for controlling a switch unit of a resonant direct current/direct current converter includes a frequency modulation controller and a pulse selector. The frequency modulation controller is adapted to be coupled electrically to the converter for receiving a correcting threshold value and output information of the converter, and for generating a synchronization signal according to the correcting threshold value and the output information received thereby. The pulse selector is adapted to be coupled electrically to the converter and the frequency modulation controller for receiving the correcting threshold value, the output information and the synchronization signal, and for generating a driving signal according to the correcting threshold value, the output information and the synchronization signal received thereby. The driving signal is adapted to drive the switch unit and has a working period.

Abstract: A controller is adapted for controlling a switch of a resonant direct current/direct current converter, and includes: a pulse width modulation controlling unit for detecting an output voltage of the resonant direct current/direct current converter, and for generating a pulse width modulation signal according to the output voltage detected thereby; a fixed frequency signal generating unit for generating a fixed frequency signal; and a logic synthesizing unit for synthesizing the pulse width modulation signal and the fixed frequency signal so as to generate a driving signal that is adapted to drive the switch of the resonant direct current/direct current converter.