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Fast transient response step inductor for switching converter

A power converter and inductance technology, which is applied to conversion equipment without intermediate conversion to AC, DC power input to DC power output, instruments, etc. The effect of output inductor pulsating current and increasing power supply efficiency

Inactive Publication Date: 2005-03-16
THE UNIVERSITY OF HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this technique is that it creates additional switching losses in the switch and additional magnetic losses in the inductor core
In addition, high-frequency operation requires the use of high-performance drive circuits that can further expand the converter's cost

Method used

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  • Fast transient response step inductor for switching converter
  • Fast transient response step inductor for switching converter
  • Fast transient response step inductor for switching converter

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0026] image 3 A circuit diagram of a first embodiment of the invention incorporated into a power converter is shown. This embodiment includes a power supply circuit 110 and a control circuit 120 . The power supply circuit 110 includes a pair of input terminals 101 and 102 for connecting with a DC voltage source to receive input power, and an output capacitor C101 for providing regulated DC output power to a load 107 connected to the output capacitor C101 . The power supply circuit 110 also includes a pair of switches M101 and M102, wherein in this embodiment the switches M101 and M102 are represented by MOSFETs, but can be selected from many suitable devices like BJTs, electromechanical switches, IGBTs, and semiconductor switches. Choose one as a switch. Switches M101 and M102 are controlled by control circuit 120 to generate a series of alternating voltage pulses.

[0027] A magnetic circuit 130 is connected between the switches M101 and M102 and the output capacitor C10...

no. 2 example

[0042] Figure 6 A circuit diagram of a second embodiment of the invention incorporated into a power converter is shown. The difference between this embodiment and the first embodiment is that the additional voltage source of the first embodiment is canceled by using the input voltage source as the additional voltage source. The second embodiment includes a power supply circuit 210 and a control circuit 220 .

[0043] The power circuit 210 includes a pair of input terminals 201 and 202 for connecting with a DC voltage source to receive input power, and an output capacitor C201 for providing a regulated DC output power to a load 207 connected to the output capacitor C201 . The power supply circuit 210 also includes a pair of switches M201 and M202, which in this embodiment are represented by MOSFETs, but can be selected from any number of suitable devices such as BJTs, electromechanical switches, IGBTs, and semiconductor switches as switch. The switches M201 and M202 are co...

no. 3 example

[0050] Figure 7 A circuit diagram of a third embodiment of the invention incorporated into a power converter is shown. The main difference between this embodiment and the first embodiment is that the additional voltage source of the first embodiment is eliminated by using the output voltage source as the additional voltage source. In addition, two clamping diodes are used to prevent switch overvoltage. The third embodiment includes a power supply circuit 310 and a control circuit 320 .

[0051]The power circuit 310 includes a pair of input terminals 301 and 302 for connecting with a DC voltage source to receive input power, and an output capacitor C301 for providing a regulated DC output power to a load 307 connected to the output capacitor C301 . The power supply circuit 310 also includes a pair of switches M301 and M302, wherein MOSFETs are used to represent the switches in this embodiment. Switches M301 and M302 are controlled by control circuit 320 to generate a serie...

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Abstract

A fast transient response power converter is disclosed which makes use of a variable inductor to speed up the converter's output voltage response under fast transient conditions. The inductive element in a switching converter is replaced by two series or parallel inductive elements of which one has a smaller inductance value and the other has a larger inductance value. During the fast transient condition, the total inductance is greatly reduced to allow rapid current change during the transient condition.

Description

field of invention [0001] The present invention relates to switching power converters. technical background [0002] The switching converter circuit structure is widely used as a main structural unit in high-efficiency and light-weight power supplies like those used in computers. However, a major disadvantage of switching converters is their transient output response to a fast load change. Because most switching power converters include an output inductor, the transient response of a switching power converter is inherently limited. For example, a typical bucked converter includes a power stage with switches and an inductor-capacitor filter and a feedback circuit. A feedback circuit monitors the output voltage of the converter and performs pulse width modulation control of the switches. When there is a fast dynamic load change, the converter's responsiveness is limited by the feedback circuit and the power stage. The response of the feedback circuit can be designed faster...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M2001/0019H02M3/158H02M1/0019
Inventor F·N·K·潘B·M·H·庞J·C·P·廖
Owner THE UNIVERSITY OF HONG KONG