The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 2014
Filed:
Jan. 06, 2011
Philippe Deval, Lutry, CH;
Philippe Gimmel, Lausanne, CH;
Marius Budaes, Jud. Bacau, RO;
Daniel Leonescu, Bucharest, RO;
Terry Cleveland, Endicott, NY (US);
Scott Dearborn, Brackney, PA (US);
Philippe Deval, Lutry, CH;
Philippe Gimmel, Lausanne, CH;
Marius Budaes, Jud. Bacau, RO;
Daniel Leonescu, Bucharest, RO;
Terry Cleveland, Endicott, NY (US);
Scott Dearborn, Brackney, PA (US);
Microchip Technology Incorporated, Chandler, AZ (US);
Abstract
A high voltage switching regulator has significantly reduced current sensing delay between measurement of input current and generation of sensed current values, while maintaining good accuracy of the current through a power transistor using current replication and a current conveyor. High sensing accuracy of the input current ensures good load regulation, and low sensing delay ensures fixed duty cycle over a wide range of output currents and high input to output voltage ratios. A current conveyor is used to transfer high side current values to low side control circuits, e.g., pulse width modulation (PWM) control. The current conveyor is always on, e.g., some current flow is always present, thus minimizing any current measurement delay. This is accomplished by dynamically biasing the current conveyor by draining to ground a current equal to the sensed current. Wherein balancing of the current conveyor is ensured and offset at the input of the current conveyor is minimized.