Active Current Sensing for High Voltage Switching Regulators

A voltage switching and current sensing technology, applied in the direction of adjusting electrical variables, measuring only current, control/regulating systems, etc., can solve the problems of accuracy loss, increased switching noise, decreased accuracy, etc., to reduce delay and increase adjustment. Resolution, effect of good measurement accuracy
CN102652390BInactive Publication Date: 2016-02-17MICROCHIP TECH INC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
MICROCHIP TECH INC
Publication Date
2016-02-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention discloses a high voltage switching regulator with significantly reduced current sensing delay between the measurement of the input current and the generation of the sensed current value, while using current replicating and current conveyors to maintain current flow through the power transistors. Good accuracy of current. High sensing accuracy of input current ensures good load regulation, and low sensing latency ensures constant duty cycle over a wide range of output currents and high input / output voltage ratios. The current transmitter is used to transmit the high-side current value to the low-side control circuit (eg, pulse width modulation PWM control). The current transmitter is always on (eg, there is always some current flowing), thereby minimizing any current measurement delays. This is accomplished by dynamically biasing the current conveyor by draining a current equal to the sense current to ground. Thereby the balance of the current conveyor is ensured and the offset at the input of the current conveyor is minimized.
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Description

[0001] Related patent applications

[0002] This application asserts a claim against the authors of Philippe Deval, Philippe Gimmel, Marius Budaes, Daniel Leonescu, Terry Cleveland, and Co-owned U.S. Provisional Patent Application Serial No. 61 / 2010, entitled "Effective Current Sensing for High Voltage Switching Regulators," filed February 1, 2010, by Scott Dearborn 300,174; and is incorporated herein by reference for all purposes. technical field

[0003] The present invention relates to switching regulator power supplies, and more particularly, the present invention relates to high resolution current measurement in switching regulator power supplies with minimal measurement delay. Background technique

[0004] As higher efficiencies are sought for low power applications, more and more linear regulator solutions are being replaced by switching regulator solutions. However, a limitation of current technology switching regulators is usually limited to monitoring the VIN / VO...

Claims

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