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A driving circuit for dc-dc converter

A driving circuit, DC-DC technology, applied in the direction of converting DC power input to DC power output, instruments, electrical components, etc., to achieve the effect of small driving loss, improved efficiency, and small conduction loss

Inactive Publication Date: 2017-12-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the DC-DC converter, there are mainly three kinds of power loss: conduction loss, static loss and dynamic loss (including the drive loss and crossover loss of the power switch tube)

Method used

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  • A driving circuit for dc-dc converter
  • A driving circuit for dc-dc converter
  • A driving circuit for dc-dc converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] exist figure 1 On the basis of the above, a 3-segment NMOS tube is used as the power switch tube of the upper tube, and a 3-segment NMOS tube is used as the power switch tube of the lower tube. Correspondingly, the output of the drive unit also corresponds to 3 control signals of seg1, seg2 and seg3. When the load current is greater than Imax, the three power switch tubes are kept on. When the load current is less than Imin, only one power switch tube is in the normal working state and kept on, and the remaining two power switches are always in the off state. And when the load current is between Imax and Imin, two stages of power switch tubes are kept on, and one stage of power switch tubes is kept off.

[0021] figure 2 It is a structural diagram of the segmented drive control circuit in this example, which is composed of two comparators CMP1 and CMP2 and a state machine FSM. The non-inverting input terminal of CMP1 and the inverting input terminal of CMP2 are connec...

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PUM

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Abstract

The invention relates to the technical field of integrated circuits, in particular to a driving circuit for a DC-DC converter. The circuit of the present invention includes a feedback control unit, a drive control unit, a switch tube buffer, a power switch tube, a bootstrap capacitor Cboot, an output filter inductor L, a filter capacitor Cout and a load Load. The power switch tube is divided into an upper tube and a lower tube, which are respectively composed of k segments and m parallel-connected NMOS tubes. According to different load currents, power switch tubes with different numbers of segments can be controlled to be turned on. The lighter the load is, the less the number of power switch tubes is turned on. When the number of power switch tubes is 1, the floating gate voltage drive function starts to work, and the gate drive voltage is adjusted according to the load current, thereby reducing the power switch under light load. drive losses, thereby improving the efficiency of the DC‑DC converter, especially at light loads. The invention is especially suitable for improving the efficiency of a DC-DC converter with a heavy current load under light load conditions.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a driving circuit for a DC-DC converter. Background technique [0002] DC-DC converters are widely used in smart devices such as mobile phones and tablets. As these devices become more and more powerful, the requirements for power supply performance are also getting higher and higher. Therefore, it is important to improve the conversion efficiency of DC-DC converters. very important. [0003] In the DC-DC converter, there are mainly three kinds of power loss: conduction loss, static loss and dynamic loss (including the drive loss and crossover loss of the power switch tube). Under different load currents, various power losses have different effects on conversion efficiency. For example, under heavy load conditions with large load currents, conduction loss is the main source of power loss, while under light load conditions with small load currents Under the circumsta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M1/088
CPCH02M1/088H02M3/155
Inventor 罗萍寇武杰周才强韩晓波王军科尚敏霞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA