Excelliance Mos Corporation

Leadtrend Technology Corporation

Ming-Hung Chien

Ching-Tsan Lee

Pei-Ting Yang

Chun-Hsin Li

Ke-Wei Wu

A control device of a power switch includes a voltage boost circuit, a discharge circuit and a bias voltage generating circuit. The voltage boost circuit generates a control voltage at a control end of the power switch by boosting a base voltage. The discharge circuit provides a discharge path between the control end of the power switch and a reference ground end according to a bias voltage. The bias voltage generating circuit compares an output voltage on an output end of the power switch with the control voltage to generate a comparison result, and generates the bias voltage according to the comparison result.

Control device of power switch

A voltage converting circuit and a control circuit thereof are provided. The control circuit includes a comparator, a clock generator, and a boost circuit. The comparator compares an input voltage with an output voltage to generate a comparison signal. The clock generator generates a clock signal according to the comparison signal to enable the clock signal to have a first frequency in a first time interval and to have a second frequency in a second time interval. The first frequency is higher than the second frequency. The first time interval occurs before the second time interval. The boost circuit receives the clock signal, pulls up a control signal of a driving switch in the first time interval according to a first driving capability, and generates the control signal in the second time interval according to a second driving capability. The first driving capability is greater than the second driving capability.

Voltage converting circuit and control circuit thereof

A control circuit of a load switch including a charge pump circuit, an oscillator, and a current signal generator is provided. The charge pump circuit generates a control signal according to a clock signal. The load switch is turned on or turned off according to the control signal. The oscillator generates the clock signal according to a control current. The current signal generator provides a resistor string to receive a power voltage. The resistor string of the current signal generator generates a sensed current or a sensed voltage according to the power voltage. The current signal generator generates the control current according to a reciprocal of the sensed current or a square of the sensed voltage. A frequency of the clock signal is negatively related to the power voltage.

Control circuit for load switch

A power circuit including a switching circuit and a soft start control circuit is provided. A first terminal of the switching circuit is configured to receive an input voltage. A control terminal of the switching circuit receives a control signal. A second terminal of the switching circuit is configured to provide an output voltage. The soft start control circuit generates the control signal according to the output voltage and a first reference voltage to control a turn-on state of the switching circuit. The soft start control circuit switches a slope of the control signal from a first slope to a second slope after the switching circuit is turned on and when a voltage value of the control signal is equal to a second reference voltage, wherein the first slope is less than the second slope to reduce an inrush current at the time when the switching circuit is turned on.

Power circuit for reducing inrush current

A power delivery controller applied to a power converter includes a voltage compensation circuit and a comparator. The voltage compensation circuit is used for generating a compensation reference voltage, receiving a response signal through a universal serial bus type-C cable, and generating a response voltage when an electronic device coupled to the universal serial bus type-C cable generates the response signal corresponding to a Biphase Mark Coding (BMC) signal, wherein the response voltage and the compensation reference voltage have information relative to an internal resistor of the universal serial bus type-C cable. The comparator is used for generating a comparison signal according to the response voltage and the compensation reference voltage, wherein the power converter transmits power to the electronic device according to a specification corresponding to universal serial bus power delivery (USB-PD) after the comparator generates the comparison signal.

Power delivery controller applied to a power converter and operation method thereof

A voltage converter and a control circuit thereof are provided. The control circuit includes a voltage status comparator and a control signal generator. The voltage status comparator receives an input voltage and an output voltage, and provides a base voltage. The voltage status comparator compares voltage values of the output voltage and the input voltage or compares voltage values of the output voltage and the base voltage according to a voltage status of the input voltage, and generates a comparison result. The voltage status comparator generates a bias voltage according to the comparison result. The control signal generator generates a control signal according to the bias voltage and transmits the control signal to a control terminal of a driving switch, where the driving switch is turned on or cut off according to the control signal.

Growing community of inventors

Hsinchu County, Taiwan

Ming-Hung Chien