Smart Prong Technologies, Inc.

International Rectifier Corporation

Brian Stevenson

Parviz Parto

Yang Chen

A system may include first and second node, switch, driver, capacitor, and second driver. The first node may be at first voltage. The second node may be at second voltage. The switch may be coupled to the second node and output of the second driver and configured to receive input at third voltage and voltage at fourth voltage and to provide the input to the second node when the fourth voltage is greater than the third voltage. The driver may be coupled to the first and second nodes and configured to receive driver input and to generate intermediate voltage based on the driver input. The capacitor may be coupled to the driver to shift the intermediate voltage. The second driver may be coupled to the second node and the driver and configured to receive second driver input and the shifted intermediate voltage to generate the voltage at the fourth voltage.

Floating charge pump

The rising edge of a pulse width modulated output signal occurs after an input ramp signal starts to rise. The ramp signal starts to rise after the rising edge of a periodic set signal and before the falling edge of a periodic set signal. A feedback control signal intersects a substantially linear region of the ramp signal to generate a reset signal using a PWM comparator. The periodic set signal and reset signal are input to a latching circuit to generate the pulse width modulated output signal. The minimum pulse width can approach zero while having adequate overdrive to the PWM comparator. Having the rising edge of the reset signal rise before the falling edge of the set signal can allow a zero percent duty cycle without the need for a ramp offset voltage.

Growing community of inventors

Rancho Santa Margarita, CA, United States of America

Brian Stevenson