Chung Lung Pai: High efficiency power converter. Richtek Technology, Rosenberg Klein & Lee, April 10, 2007: US07202653 (147 worldwide citation)

A high efficiency power converter comprises a boost converter for converting an input voltage to a first voltage on a first output, a buck converter for converting the input voltage to a second voltage on a second output, a linear regulator for converting the first voltage to a third voltage on the ...

Wei Jen Huang, Tsung Wei Huang, Shui Mu Lin: Rectifying-and-modulating circuit and wireless power receiver incorporating the same. RICHTEK TECHNOLOGY, Osha Liang, December 29, 2015: US09225196 (135 worldwide citation)

A wireless power receiver includes a power receiving circuit wirelessly receiving power transmitted from a wireless power transmitter so as to generate an induced current, and a rectifying-and-modulating circuit including first to eighth switches and a control unit. The control unit is operable to c ...

Chung Lung Pai: Dual-input power converter and control methods thereof. Richtek Technology, Rosenberg Klein & Lee, August 12, 2008: US07411316 (83 worldwide citation)

A dual-input power converter comprises two power stages using a common low-side element, a first input for coupling a first input voltage to the first power stage, a second input for coupling a second input voltage to the second power stage, and a controller for driving the first and second power st ...

Tzu Chen Lin, Pei Lun Huang, Hung Che Chou: Frequency jittering control for varying the switching frequency of a power supply. Richtek Technology, Rosenberg Klein & Lee, April 20, 2010: US07701305 (40 worldwide citation)

A frequency jittering circuit modulates a hysteretic band of an oscillator such that the clock generated by the oscillator has a jitter frequency, and thus a switching mode power supply operative on the clock will have a jittering switching frequency.

Hung I Wang, Shwu Liang Hsieh, Liang Pin Tai, Jing Meng Liu: Multi-phase DC-to-DC buck converter with multi-phase current balance and adjustable load regulation. Richtek Technology, Rosenberg Klein & Lee, December 30, 2003: US06670794 (37 worldwide citation)

To balance the current of individual channel as well as regulate the output voltage for a multi-phase DC-to-DC buck converter, the converter output voltage is sensed and compared with a reference signal to produce a first error signal serving as first control signal for PWM signals of the converter ...

Isaac Y Chen, An Tung Chen, Liang Pin Tai: Circuit and method for soft start from a residual voltage. Richtek Technology, Rosenberg Klein & Lee, March 10, 2009: US07501805 (34 worldwide citation)

A circuit and method for soft start of a system compare a feedback signal produced from an output voltage of the system with a ramp signal to generate a comparison signal, and enables the system once the comparison signal indicating the ramp signal reaches the feedback signal, such that the output v ...

Kent Huang, Liang Pin Tai: Fixed-frequency current mode converter and control method thereof. Richtek Technology, Rosenberg Klein & Lee, June 12, 2007: US07230406 (32 worldwide citation)

A fixed-frequency current mode converter comprises a power stage to produce an inductor current and an output voltage, an error amplifier to generate an error signal from the difference between the output voltage and a reference voltage varied with the inductor current, a comparator to compare the e ...

An Tung Chen, Chih Hao Yang: Control circuit and method for a ripple regulator system. Richtek Technology, Muncy Geissler Olds & Lowe PLLC, May 21, 2013: US08446135 (31 worldwide citation)

A control circuit and method for a ripple regulator system generate a ripple signal in-phase and synchronous with an inductor current of the ripple regulator system, and extract a ripple information proportional to the amplitude of the ripple signal. The ripple signal is used for triggering control ...

Liang Pin Tai, Shwu Liang Hsieh, Hung I Wang, Jing Meng Liu: Two-step ripple-free multi-phase buck converter and method thereof. Richtek Technology, Rosenberg Klein & Lee, January 4, 2005: US06839252 (31 worldwide citation)

A two-step ripple-free multi-phase buck converter and method thereof comprises a first-stage voltage regulator to convert an input voltage to an intermediate voltage and a second-stage voltage regulator with a phase number not less than two to further convert the intermediate voltage to an output vo ...

Chung Sheng Cheng, Chung Shu Li, Chia Jung Lee, Jian Rong Huang: Current balance in a multi-phase power converter with constant on-time control. Richtek Technology, Muncy Geissler Old s& Lowe PLLC, January 22, 2013: US08358113 (31 worldwide citation)

A multi-phase power converter with constant on-time control includes a plurality of channels to convert an input voltage into an output voltage, and each of the channels is driven by a control signal. When all channel currents of the channels are balanced, each of the control signals remains a const ...