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Current threshold detection in syncronous regulation

A current and threshold technology, applied in the direction of adjusting electrical variables, controlling/regulating systems, measuring current/voltage, etc., can solve the problems of zero-crossing detection risk accuracy and critical control

Active Publication Date: 2017-06-13
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Many legacy synchronous converters do not use zero-crossing detection and instead use forced CCM because the complexity of zero-crossing detection can potentially introduce risk, accuracy issues, and critical control

Method used

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  • Current threshold detection in syncronous regulation
  • Current threshold detection in syncronous regulation
  • Current threshold detection in syncronous regulation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0083] Example 1. An apparatus comprising a synchronous regulator controller comprising: a synchronous switch arranged to receive an inductor current; a first voltage divider arranged in parallel with the synchronous switch to sense the inductor current wherein said first voltage divider comprises first resistive means and second resistive means coupled to the first resistive means; a comparison circuit arranged to determine whether the inductor current has reached a threshold, wherein the comparison circuit comprises: Three resistive means arranged to provide a differential comparison voltage by shifting the voltage across the second resistive means; a first current source arranged to supply current to the third resistive means whereby the voltage across the second resistive means The offset corresponds to said threshold; and a comparator arranged to determine whether the inductor has reached said threshold by performing a comparison based on a differential comparison voltage....

example 12

[0094] Example 12. The device of any combination of examples 1-11, wherein the synchronization switch comprises a first finger and a second finger.

[0095] Example 13. The apparatus of example 12, wherein the synchronous regulator controller further comprises a second voltage divider coupled to the second finger of the synchronous switch, and wherein the second voltage divider comprises fourth resistive means and fifth resistive means, and wherein the comparison circuit further includes sixth resistive means coupled to the second voltage divider and the comparator.

example 14

[0096] Example 14. A method comprising: driving a synchronous switch arranged to receive an inductor current; using a voltage divider arranged in parallel with the synchronous switch to sense a portion of the inductor current; A differential comparison voltage is provided by shifting a voltage across a portion of the voltage divider; and the comparison is performed based on the differential comparison voltage.

[0097] Example 15. The method of example 14, further comprising: biasing the first resistive means in the ohmic region when the synchronous switch is turned on; and biasing the second resistive means in the ohmic region when the synchronous switch is turned on, Wherein said voltage divider comprises a first resistor means and a second resistor means.

[0098] Example 16. The method of any combination of examples 14-15, further comprising: outputting a comparison output signal based on the comparison; turning on and off the synchronous switch according to the pulse modu...

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PUM

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Abstract

The invention relates to current threshold detection in synchronous regulation. A synchronous regulator controller includes a synchronous switch that is coupled between a first node and a second node. The controller also includes a first voltage divider that includes a first resistive device that is coupled between the first node and a third node, and a second resistive device that is coupled between the third node and a second node. The controller also includes a comparator having a first input that is coupled to the first node, and a second input that is coupled to a forth node. The controller also includes a current source that is arranged to provide a current to the fourth node. The controller also includes a third resistive device that is coupled between the third node and the fourth node.

Description

technical field [0001] The present disclosure relates to synchronous regulators, and more particularly to zero-crossing detection and overload protection in synchronous regulator controllers. Background technique [0002] Zero-crossing detection (ZCD) is a subsystem in some synchronous integrated DC / DC power converters, in particular, DC / DC step-down converters (Buck). Forced CCM (Continuous Conduction Mode) operation is generally not desired in the mid / low load range compared to DCM (Discontinuous Conduction Mode) due to the huge efficiency drop. [0003] Overload detection (OVL) also plays a role in synchronous integrated DC / DC power converters. OVL provides a current limiting mechanism on the buck converter's low-side power switch and prevents current escape in the event the buck converter has an output shorted to ground. [0004] Many conventional synchronous converters do not use zero-crossing detection, but instead use forced CCM because the complexity of zero-crossi...

Claims

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Application Information

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IPC IPC(8): H02M3/155G01R19/165G01R19/175
CPCG01R19/16576G01R19/175H02M3/155H02M3/1588Y02B70/10H02M1/0009H02M1/32H02M3/158
Inventor E.奥里埃蒂D.瓦卡卡瓦洛托
Owner INFINEON TECH AG