Abstract: A direct-current (DC) voltage conversion device includes a resonate driving device, at least two second transformers, at least two second transformers, at least two third transformers, and a rectifying device. The primary sides of the second transformers are connected in series via a first conductive wire and coupled to the resonate driving device via a second conductive wire. The primary sides of the second transformers are connected in series via a third conductive wire and coupled to the resonate driving device via a fourth conductive wire. The primary sides of the third transformers are connected in series via a fifth conductive wire and coupled to the resonate driving device via a sixth conductive wire. The rectifying device is coupled to the secondary sides of the transformers.

Abstract: A power conversion device includes a transformer, a first electrical switch, a second electrical switch, at least one balanced capacitor, at least one voltage-stabilizing capacitor, and a power-providing circuit. The first electrical switch, the second electrical switch, the balanced capacitor, and the voltage-stabilizing capacitor are connected to the primary side of the transformer, and the secondary side of the transformer is connected to the power-providing circuit. The primary side has a first terminal, a second terminal, and a third terminal therebetween. The first electrical switch and the second electrical switch are respectively connected to a high-voltage terminal and a low-voltage terminal, and the voltage-stabilizing capacitor is connected between the two voltage terminals. One end of the balanced capacitor is connected to the third terminal, and another end of the balanced capacitor is connected to the voltage-stabilizing capacitor or the voltage terminals.

Abstract: A voltage control method for a power converter includes: acquiring a current of a first primary side winding of a transformer circuit of the power converter; integrating the acquired current to obtain an average voltage; comparing the average voltage with a reflected voltage associated with a current of a secondary side winding of the transformer circuit; and adjusting a duty cycle of a switch of the power converter based on an obtained comparison result for adjustment of an output voltage of the power converter.

Abstract: A voltage control method for a power converter includes: acquiring a current of a first primary side winding of a transformer circuit of the power converter; integrating the acquired current to obtain an average voltage; comparing the average voltage with a reflected voltage associated with a current of a secondary side winding of the transformer circuit; and adjusting a duty cycle of a switch of the power converter based on an obtained comparison result for adjustment of an output voltage of the power converter.

Abstract: An electric power converting device includes a rectifier, a flyback voltage converter and a non-isolated voltage regulator. The rectifier is for converting an alternating current (AC) signal received from an AC power source into a direct current (DC) signal. The flyback voltage converter is electrically connected to the rectifier for transforming voltage of the DC signal from the rectifier to output a regulated DC signal. The non-isolated voltage regulator is electrically connected to the flyback voltage converter for reducing a voltage ripple of the regulated DC signal from the flyback voltage converter and for outputting an output voltage to a load.