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Charge pump circuit for realizing multi-mode voltage gain and realizing method thereof

A voltage gain and multi-mode technology, applied in the field of charge pump, can solve the problem that the charge pump circuit cannot meet the development needs

Inactive Publication Date: 2012-11-14
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the charge pump circuit with only three boost functions used in LED driver chips can no longer meet the needs of development.

Method used

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  • Charge pump circuit for realizing multi-mode voltage gain and realizing method thereof
  • Charge pump circuit for realizing multi-mode voltage gain and realizing method thereof
  • Charge pump circuit for realizing multi-mode voltage gain and realizing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0044] The charge pump circuit of multi-mode voltage gain of the present invention is as Figure 5 shown, where the input voltage V IN The voltage gain of 1 times, 1.25 times, 1.5 times and 2 times can be obtained through four boost modes respectively, and the output V OUT , C 1 、C 2 is the fast charge capacitor, C HOLD is the output capacitance, S 1 ~S 8 For the power switch tube.

[0045] The working principle of the four boost mode implementation process is as follows:

[0046] (1) 1x boost mode

[0047] Such as Figure 6 Shown, M 1 ~ M 8 for S 1 ~S 8 Corresponding control signal of the power switch tube. It can be seen that the power switch tube control signal M 1 and M 4 Continuously high level, M 2 , M 3 and M 5 ~ M 8 Continuously low level, corresponding to the power switch S 1 and S 4 conduction, S 2 , S 3 and S 5 ~S 8 Cut off, V IN by S 1 and S 4 short to V OUT , so that V IN =V OUT , to complete the 1x boost mode.

[0048] (2) 1.25 tim...

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PUM

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Abstract

The invention discloses a charge pump circuit for realizing multi-mode voltage gain. In the charge pump circuit, only eight power switching tubes, two charging capacitors and one output capacitor are needed to be used, and the function of boosting by 1 time, 1.25 times, 1.5 times and 2 times in the circuit can be realized according to the control signals of the external power switching tubes. Compared with the conventional charge pump circuit, the invention has the 1.25-time boosting function additionally without an additional charging capacitor.

Description

technical field [0001] The invention relates to charge pump technology, in particular to a charge pump circuit capable of realizing multiple voltage gain modes. Background technique [0002] The charge pump circuit applied to the white light LED driver chip is a kind of switched capacitor DC / DC converter, which can realize various multiples of voltage conversion. Because it does not contain inductive components, it is suitable for making integrated circuits and is widely used in battery-powered portable devices such as white LED driver chips that require high component efficiency. At present, mainstream white LED driver chips use 1x / 1.5x / 2x three voltage gain mode charge pumps, which only need 2 external charging capacitors to have 1x, 1.5x and 2x boost functions. [0003] figure 1 is a known 1x / 1.5x / 2x tri-mode charge pump circuit, C 1 、C 2 is the fast charge capacitor, C HOLD is the output capacitance, S 1 ~S 8 For the power switch tube. When the known 1x / 1.5x / 2x t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
Inventor 黄君凯黄振杰
Owner JINAN UNIVERSITY