Richtek Technology Corporation

Jiun-Jang Lin

Jhen-Yu Li

Tsung-Wei Huang

Sin-Sian Jheng

Yong-Hong Huang

Sheng-Kai Fan

Chien-Tzu Ko

Yan-Jhen Huang

An electronic circuit includes a first switched capacitor circuit and a second switched capacitor circuit. The first switched capacitor circuit charges and discharges a first flying capacitor to power a load. The second switched capacitor charges and discharges a second flying capacitor to power the load. When the first switched capacitor operates in a dead time, the second switched capacitor powers the load with the second flying capacitor.

Reducing output ripple voltage of multiple switched capacitor circuits by reducing overlapping of dead time

A pull-up voltage detection circuit is for use in a serial bus. The serial bus includes a communication signal. During a communication interval, the communication signal is toggled based on a pull-up voltage for communicating on the serial bus via open-drain scheme. The pull-up voltage detection circuit includes: at least one comparator circuit for comparing the communication signal or a divided voltage thereof with at least one reference voltage in a detection procedure, so as to generate at least one comparison result; and a selector circuit for selecting one of plural predetermined voltages according to the at least one comparison result. The selected predetermined voltage serves as a logic threshold voltage corresponding to the pull-up voltage. In the communication interval, the logic state of the communication signal is determined by comparing the communication signal and the logic threshold voltage for communicating on the serial bus.

Pull-up voltage detection circuit and pull-up voltage detection method

A power supply system providing a power conversion function for a system circuit includes first, second and third convertor circuits respectively including plural switches and first, second and third inductors. The first and second convertor circuits are coupled to first and second power supplies respectively through first and second ports of the system circuit. A third power supply is coupled to a battery module and an internal load circuit. The plural switches are configured to correspondingly switch the first to third inductors to perform power conversion between the first to third power supplies and an internal power bus of the system circuit. The voltage of the internal power bus is configured to be higher than any voltage of the first to third power supplies, such that a current of the internal power bus is lower than a third current of the third power supply.

High efficiency power supply system having multiple ports

A hybrid switching power converter is configured to perform power conversion between a first power, a second power, and a third power. The hybrid switching power converter includes a switched inductor conversion circuit and a switched capacitor conversion circuit, wherein the switched inductor conversion circuit is configured to perform the power conversion between the first power and the second power, and the switched capacitor conversion circuit is configured to perform the power conversion between the second power and the third power. The switched inductor conversion circuit includes a plurality of inductor switches, wherein the plural inductor switches include a first switch and a second switch. The switched capacitor conversion circuit includes a plurality of capacitor switches, wherein the plural capacitor switches include the first switch and the second switch.

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Taichung, Taiwan

Jiun-Jang Lin