Hao Peng, 51San Jose, CA

7902803, Mar 8, 2011

Dec 31, 2007

11/967981

Hao Peng - San Jose CA, US
Dragan Maksimovic - Boulder CO, US

The Regents of the University of Colorado - Denver CO

G05F 1/00

323283

A digital current-mode controller for a DC-DC converter is disclosed. The controller comprises a digital current reference; and a current loop compensator adapted to receive a digital current error signal derived from a digital current sample sensed from the DC-DC converter and the digital current reference and to generate a duty-cycle command, wherein the current loop compensator comprises a low-pass filter that is used in generating the duty-cycle command. A DC-DC regulator comprising a digital current-mode controller and a method of controlling a DC-DC converter are also disclosed.

8373402, Feb 12, 2013

Sep 1, 2009

12/552051

Hao Peng - Sunnyvale CA, US

Semtech Corporation - Camarillo CA

G05F 1/00

323283

A pulse width modulator (PWM) control system for a power converter achieves a fast transient response and low steady-state jittering. The control system manages the ADC sample timing to reduce noise susceptibility, and the ADC includes a regulation bin or dead band to minimize large phase corrections and thus eliminate limit cycling. The PWM module includes a dithering circuit to accumulate fractional PWM control signals to reduce period jitter by increasing the effective resolution of the pulse width modulator.

8427126, Apr 23, 2013

Nov 30, 2009

12/627912

Hao Peng - Sunnyvale CA, US
Chin Chang - Agoura Hills CA, US

Semtech Corporation - Camarillo CA

G05F 1/575

323283, 323284

A system and method for controlling a digital pulse-width modulated power converter achieves a fast large-signal transient response while maintaining a slow response near the steady-state operating point in order to assure stability and to reduce the system's susceptibility to noise. Digital output error samples are processed through a gain scheduling block that applies a non-linear gain function to produce a weak loop response when the system is near its steady-state equilibrium point and a strong loop response when large transients are encountered. The resulting system maintains a fast transient response to large error signals while reducing noise and loop jittering and assuring loop stability.

2006027, Dec 7, 2006

Mar 6, 2006

11/369888

Dragan Maksimovic - Boulder CO, US
Hao Peng - San Jose CA, US

H03F 3/45

327103000

Differential delay-line analog-to-digital (A/D) converters for use in current and power sensing applications are provided. These A/D converters are well suited for a wide range of electronic applications, including over-load protection, current mode control, current sharing in digitally controlled switched-mode power supplies, power sensing, and implementation of power optimization methods in power management applications.

2012021, Aug 23, 2012

Feb 16, 2012

13/398150

Jinho Choi - Saratoga CA, US
Hao Peng - Sunnyvale CA, US
Wanfeng Zhang - Palo Alto CA, US
Tuyen Doan - San Jose CA, US

H03K 5/153

327 75

Methods, circuits, and systems for determining the presence of a chopped input signal are disclosed. A digital signal generator can produce multiple digital signals when an alternating current (AC) signal input reaches multiple threshold voltages. The times at which the threshold voltages are reached can be determined by looking at the times at which the digital signals go high and low. The differences between the times at which the digital signals go high and low are used to determine if the AC signal input is a leading or trailing edge chopped signal. The AC input signal is a leading edge chopped signal when the difference between the times at which the digital signals go high is less than a predetermined time threshold, and is a trailing edge chopped signal when the difference between the times at which the digital signals go low is less than a predetermined time threshold.

2012023, Sep 13, 2012

Feb 24, 2012

13/404584

Jinho Choi - Saratoga CA, US
Hao Peng - Sunnyvale CA, US
Wanfeng Zhang - Palo Alto CA, US
Tuyen Doan - San Jose CA, US

H02M 3/335

363 2118

A system including a switch configured to supply power to a load. A first comparator is configured to compare a first current through the switch to a first threshold. A second comparator is configured to compare the first current through the switch to a second threshold. The second threshold is greater than the first threshold. A current control module is configured to turn off the switch (i) for a first duration in response to the first current through the switch being greater than or equal to the first threshold and (ii) for a second duration in response to the first current through the switch being greater than or equal to the second threshold. The current control module is configured to adjust the second duration based on a difference between an estimated current through the load and a desired current through the load.

2015007, Mar 19, 2015

Nov 20, 2014

14/548832

- St. Michael, BB
Hao Peng - Sunnyvale CA, US
Wanfeng Zhang - Palo Alto CA, US
Tuyen Doan - San Jose CA, US

G01R 19/00
G01R 17/02

324 7611

A first filter outputs a first signal in response to receiving an input signal. The first signal has a first state in response to the input signal reaching a first threshold voltage on a leading edge of the input signal, and a second state in response to the input signal reaching the first threshold voltage on a trailing edge of the input signal. A second filter outputs a second signal in response to receiving the input signal. The second signal has the first state in response to the input signal reaching a second threshold voltage on the leading edge of the input signal, and the second state in response to the input signal reaching the second threshold voltage on the trailing edge of the input signal. A detection circuit determines, based on times when the first and second thresholds are reached, whether the input signal is received from a triac.