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Phase current balancing for multiphase converters

A converter and current technology, applied in the direction of output power conversion devices, DC power input conversion to DC power output, instruments, etc., can solve problems such as noise sensitivity, limiting current balance circuit performance, slowness, etc.

Active Publication Date: 2018-01-26
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methods for sampling the voltage across replica power FETs to determine the loop current are sometimes used, but these techniques are inaccurate, noise sensitive, and slow, thus limiting the performance of the overall current balancing loop

Method used

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  • Phase current balancing for multiphase converters
  • Phase current balancing for multiphase converters
  • Phase current balancing for multiphase converters

Examples

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Embodiment Construction

[0011] figure 1 An example of a multiphase DC-DC converter 100 using differential voltage sensors to facilitate current balancing in the converter is illustrated. DC-DC converter 100 uses multiple phases (eg, several stages are driven off different clocks) to drive output stage 110 . The output stage 110 includes at least two inductors (eg, first and second inductors) to generate the output voltage VOUT switched by the first power stage 120 and the second power stage 124 . To facilitate desired circuit operation of DC-DC converter 100, the currents through the inductors in output stage 110 should be sensed in an order that can balance current between the stages and phases driving the respective inductors. Past sensing techniques have relied on replicating transistors in the power stage that model the current in an inductor. However, such techniques are inaccurate and expensive to manufacture. Direct sensing of inductor current is also not practical because continuous load c...

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Abstract

The present invention is for phase current balancing of multiphase converters. A DC-DC converter includes a first differential voltage sensor to detect a first inductor current by sensing a first differential voltage across a first power stage of the DC-DC converter. A second differential voltage sensor detects a second inductor current by sensing a second differential voltage across a second power stage of the DC-DC converter. an integrator stage combines the first differential voltage from the first power stage with the second differential voltage from the second power stage to generate a compensation signal to adjust the DC-DC conversion current balance of the device.

Description

technical field [0001] The present invention relates to systems and methods to provide phase current balancing for multiphase DC-DC converters. Background technique [0002] Voltage converters such as DC-DC converters come in two forms. Boost or step-up configurations are provided when the input voltage is to be voltage stepped up by the converter. Buck converters are provided when the input voltage needs to be stepped down by a converter to a lower voltage. Therefore, a buck converter is a step-down DC-DC converter. Its design is similar to a step-up boost converter, and like a boost converter, it is a switched-mode power supply using switches (eg, transistors and diodes), inductors, and capacitors. The most straightforward way to reduce the voltage of a DC supply is to use a linear regulator, but since a linear regulator operates by dissipating excess power as heat, it wastes energy. On the other hand, a switching converter such as a buck converter can be very efficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
CPCH02M3/1584
Inventor 迈克尔·库列乌尔斯特凡·赫策妮古拉·弗洛里奥
Owner TEXAS INSTR INC