Marvell International Limited

Maxim Integrated Products, Inc.

Rudy Kurniawan

Siew Yong Chui

Jye Sheng Hong

Yayue Zhang

Ravishanker Krishnamoorthy

Uday Dasgupta

Cheng Yong Teoh

Guoying Yi

Guang Zhang

Chin Boon Huam

Haitao Hu

Jia Hu

Sungil Ha

John Hu

A battery charging system includes a master charger that receives a supply voltage, outputs a master charging current based on the supply voltage, and selectively outputs a slave charger control signal. At least one slave charger receives the slave charger control signal from the master charger, receives the supply voltage, and selectively outputs a slave charging current based on the slave charger control signal and the supply voltage.

Master slave charging architecture with communication between chargers

In one embodiment, an apparatus includes output voltage comparison circuitry that compares an output voltage of a regulator and a reference voltage and outputs an output voltage comparison signal based on the comparison. Slope detection circuitry detects a slope of the output voltage and outputs a slope comparison signal based on the slope detected. Duty cycle determination circuitry receives the output voltage comparison signal and the slope comparison signal and outputs a pre-driver signal having a duty cycle based on the output voltage comparison signal and the slope comparison signal. The pre-driver signal is used to regulate the output voltage of the voltage regulator.

Hysteretic regulator with output slope detection

In one embodiment, an apparatus includes output voltage comparison circuitry that compares an output voltage of a regulator and a reference voltage and outputs an output voltage comparison signal based on the comparison. Slope detection circuitry detects a slope of the output voltage and outputs a slope comparison signal based on the slope detected. Duty cycle determination circuitry receives the output comparison signal and the slope comparison signal and outputs a pre-driver signal having a duty cycle based on the output comparison signal and the slope comparison signal. The pre-driver signal is used to regulate the output voltage of the voltage regulator.

In one embodiment the present invention includes a circuit comprising a switch and a switch driver. The switch is configured to provide synchronous rectification switching of a back-EMF voltage. The synchronous rectification switching produces a source voltage. The switch driver is configured to receive the back-EMF voltage and the source voltage. The switch driver provides a control signal to a control terminal of the switch. The control signal has a frequency. The frequency is used to control an amount of the synchronous rectification switching. Accordingly, the frequency reduces a dissipated power associated with the synchronous rectification switching.

Systems and methods for reducing spindle rectification switching

Some of the embodiments of the present invention provide a voltage regulator comprising a first driver, a second driver, and a controller configured to control the first driver and the second driver to selectably operate in one of a plurality of operating modes, including an external driver mode and an internal driver mode, wherein which one of the plurality of operating modes is selected is based on presence or absence of one or more external drivers. Other embodiments are also described and claimed.

Self configuring voltage regulators

A pulse-width modulated buck regulator includes a feedback control without having any external frequency compensation components to stabilize the feedback control loop irrespective of the reactive component of its load impedance. Additionally, the output voltage is maintained constant not only with feedback but also using a power supply voltage compensation scheme. Thus, the feedback control compensates for resistive losses, thus minimizing hardware. The output voltage is compared with first and second reference voltages. If the output voltage is greater than the first reference voltage, a counter's count is decremented. If the output voltage is less than the second reference voltage, the counter's count is incremented. The counter is disabled if the output voltage is smaller than the first reference voltage and greater than the second reference voltage. The duty cycle of the output voltage is varied in accordance with the counter's count.

Growing community of inventors

Singapore, Singapore

Rudy Kurniawan