Effective current sensing for high voltage switching regulators

A voltage switching, current sensing technology, applied in the direction of adjusting electrical variables, measuring only current, control/regulating systems, etc., can solve the problems of decreased accuracy, loss of accuracy, increased switching noise, etc., to reduce delay and increase regulation. Resolution, effect of good measurement accuracy

Inactive Publication Date: 2012-08-29
MICROCHIP TECH INC
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current conveyor must follow the voltage across the power switching transistor 200, causing significant loss of accuracy and measurement noise
As the transfer ratio of the DC / DC converter increases, switching noise increases and accuracy decreases

Method used

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  • Effective current sensing for high voltage switching regulators
  • Effective current sensing for high voltage switching regulators
  • Effective current sensing for high voltage switching regulators

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Embodiment Construction

[0018] Referring now to the drawings, details of certain example embodiments are schematically illustrated. Like elements in the drawings will be represented by the same numerals, and similar elements will be represented by the same numerals with different lowercase subscripts.

[0019] In a general sense, a power converter can be defined as a device that continuously converts one form of energy into another. Any storage or loss of energy within such power systems typically amounts to a process of energy conversion while such power systems are performing their conversion functions. There are many types of devices that can provide such functionality with varying degrees of cost, stability, complexity, and efficiency. Mechanisms for power conversion can take many basic forms, such as those that are mechanical, electrical, or chemical in nature. This article will focus on power converters that can perform energy conversion both electrically and dynamically, using a limited set ...

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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.

Description

[0001] Related patent applications [0002] This application asserts a claim to the patent rights of Philippe Deval, Philippe Gimmel, Marius Budaes, Daniel Leonescu, Terry Cleveland Cleveland and Scott Dearborn, filed February 1, 2010, entitled "Effective Current Sensing for High Voltage Switching Regulators )” 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 / VOUT ratio. When using current sensing to control a switching regu...

Claims

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Application Information

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IPC IPC(8): H02M3/158G01R19/00
CPCG01R19/0092H02M3/158H02M1/0009
Inventor 菲利普·德瓦尔菲利普·吉梅尔马里乌斯·布达斯达尼埃尔·莱奥内斯库特丽·克利夫兰斯科特·迪尔伯恩
Owner MICROCHIP TECH INC
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