San H Chee

8026707, Sep 27, 2011

Aug 29, 2007

11/847196

San Hwa Chee - Fremont CA, US

Monolithic Power Systems, Inc. - San Jose CA

G05F 1/618

323284, 323908, 323901

A circuit is provided including an output stage with a pair of transistors. Further provided is a control circuit in communication with the output stage. The control circuit is capable of controlling a duration in which at least one of the transistors is actuated for reducing an in-rush current.

8433078, Apr 30, 2013

Oct 26, 2009

12/606010

San Hwa Chee - Fremont CA, US

Monolithic Power Systems, Inc. - San Jose CA

H04B 15/00
H03F 1/14
H03F 3/217

381 945, 330 51, 330251

An audio amplifier and a method of operating such an amplifier are disclosed. The audio amplifier includes a switch disabling controller and/or an output set-point controller. The switch disabling controller is configured to disable switching of an output switch circuit or other switch circuit while an input signal represents at least relative silence. The output set-point controller is configured to bring and/or hold first and second switch nodes toward and/or at a set-point voltage while the input signal represents at least relative silence.

6369665, Apr 9, 2002

Oct 2, 2000

09/677158

San Hwa Chee - Fremont CA
Stephen W. Hobrecht - Los Altos CA
Randy Flatness - Los Gatos CA

Linear Technology Corporation - Milipitas CA

H02K 302

331143, 331153, 331175

An oscillator circuit that adjusts the oscillation voltage such that the voltage oscillates in a uniform manner independent of changes to frequency. Slope compensation is derived from the oscillation voltage. The adjustment is implemented by using a window comparator to establish a range of operation of the oscillation voltage. When the oscillation voltage is outside the range of operation, the window comparator instructs a counter circuit to either count up or count down, depending on the value of the oscillation voltage relative to the range. This counting then is used to adjust the amount of current which charges the capacitor. Thus, when the peak voltage is too low, the amount of current is adjusted upward. When the peak voltage is too high, the amount of current is adjusted downward. In this fashion, the oscillation voltage is maintained at a substantially uniform value, while the frequency is synchronized to an external clock signal.

20220231618, Jul 21, 2022

Jan 19, 2021

17/248289

- Wilmington MA, US
San Hwa Chee - San Ramon CA, US

H02M 7/5395
H02M 7/5387
H02M 3/157
H02M 3/158
H02M 1/08

Pulse width modulation (PWM) controllers for hybrid converters are provided herein. In certain embodiments, a PWM controller for a hybrid converter includes a threshold generation circuit for generating a threshold signal based on an output voltage of the hybrid converter, a threshold adjustment circuit for generating an adjusted threshold signal based on sensing a voltage of a flying capacitor of the hybrid converter, and a comparator that generates a comparison signal based on comparing the adjusted threshold signal to an indication of an inductor current of the hybrid converter. The output of the comparator is used for generating PWM control signals used for turning on and off the switches (for instance, power transistors) of the hybrid converter.

20180294717, Oct 11, 2018

Jun 11, 2018

16/005594

- Milpitas CA, US
Jian Li - San Jose CA, US
San Hwa Chee - San Ramon CA, US

H02M 3/07
H02M 1/08
H02M 1/36

Methods and systems of controlling a switched capacitor converter are provided. Upon determining that a voltage across a flying capacitor is above a first threshold, a first current is drawn from a first terminal of the flying capacitor by a first current source, and a second current is provided to a second terminal of the flying capacitor by a second current source. Upon determining that the voltage across the flying capacitor is below a second threshold, the first current is provided to the first terminal of the flying capacitor by the first current source, and the second current is drawn from the second terminal of the flying capacitor by the second current source. Upon determining that the voltage across the flying capacitor is above the second threshold and below the first threshold from the reference voltage, the first and second current sources are turned OFF.

20180019665, Jan 18, 2018

Mar 21, 2017

15/465339

- Milpitas CA, US
Jian Li - San Jose CA, US
San Hwa Chee - San Ramon CA, US

H02M 3/07

Methods and systems of controlling a switched capacitor converter are provided. Upon determining that a voltage across a flying capacitor is above a first threshold, a first current is drawn from a first terminal of the flying capacitor by a first current source, and a second current is provided to a second terminal of the flying capacitor by a second current source. Upon determining that the voltage across the flying capacitor is below a second threshold, the first current is provided to the first terminal of the flying capacitor by the first current source, and the second current is drawn from the second terminal of the flying capacitor by the second current source. Upon determining that the voltage across the flying capacitor is above the second threshold and below the first threshold from the reference voltage, the first and second current sources are turned OFF.

20180019666, Jan 18, 2018

Mar 21, 2017

15/465504

- Milpitas CA, US
Jian Li - San Jose CA, US
San Hwa Chee - San Ramon CA, US

H02M 3/07
H02M 1/08

A method and system of driving a switched capacitor converter having a plurality of switches. A first driver coupled to a first switch is powered by providing a first reference voltage level VCC to a first supply and a GND reference to a second supply node of the first driver. A second driver coupled to a second switch is powered by providing a unidirectional path between the first supply node of a first driver and the first supply node of the second driver and by keeping OFF the second switch while turning ON the first switch. A third driver coupled to a third switch is powered by providing a unidirectional path between the first supply node of a second driver and the first supply node of the third driver and by keeping OFF the first and third switch while turning ON the second switch.

20180019669, Jan 18, 2018

Mar 21, 2017

15/465487

- Milpitas CA, US
Jian Li - San Jose CA, US
San Hwa Chee - San Ramon CA, US

H02M 3/07

Methods and systems of pre-balancing a switched capacitor converter are provided. A first comparator includes a positive input configured to receive a voltage across an output capacitor and a negative input configured to receive a first hysteresis voltage. A second comparator includes a positive input configured to receive a voltage across an input capacitor of the switched capacitor converter and a negative input configured to receive a second hysteresis voltage. A first current source is coupled between the output capacitor and GND and is configured to discharge the output capacitor upon determining that the voltage across the output capacitor is above a tolerance provided by the first hysteresis voltage. A second current source is coupled between the input capacitor and GND and is configured to discharge the input capacitor upon determining that the voltage across the input capacitor is above a tolerance provided by the second hysteresis voltage.