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Voltage converter

A technology of voltage converters and capacitors, applied in the field of voltage converters, can solve problems such as incapacitation, radiating high-frequency interference, performance loss, etc.

Active Publication Date: 2014-07-09
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] - Interference will self-contaminate the chip using this DC / DC converter, causing loss of performance or even becoming completely disabled
[0012] - can radiate high-frequency interference, which can cause EMC problems in the environment

Method used

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Examples

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Embodiment Construction

[0033] figure 1 A programmable charge pump is shown, to which the invention can be applied. The following description is based on a boost converter. However, the same principles apply to buck converters. In a buck converter, charge sharing between stages is used.

[0034] Programmable charge pump 1 has a series of stages S 1 ... S N , S N+1 , each stage contains: a capacitor C as a charge storage element DCDC ; as a switch Sw 1 ...Sw N ,Sw N+1 MOSFET; and a backplane driver as a switching device (not shown). As shown, each corresponding charge pump also includes a buffer BF 1 ...BF N , BF N+1 , buffer BF 1 ...BF N , BF N+1 with input I 1 ...I N , I N+1 , to receive the clock input signal and the voltage Vdd.

[0035] A voltage source between the input terminal IP and the ground terminal GND generates an input voltage Vdd, and this input voltage Vdd is supplied to the charge pump device 1 . The stages are connected one after the other in a cascaded fashion. ...

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PUM

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Abstract

The present invention provides a voltage converter comprising at least two capacitive charge pump stages, each capacitive charge pump stage comprising a capacitor, a charging switch and a control circuit, the capacitor charging current flows through the charging switch, and the control circuit Used to control the charging switch. Wherein, the control circuit of at least one charge pump stage includes a current limiting device for limiting the current passing through the charging switch. By limiting the current through the switch, current spikes are avoided, reducing high frequency distortion.

Description

technical field [0001] The invention relates to a voltage converter for converting an input voltage into an output voltage. Background technique [0002] In current IC technology, there is an urgent need to improve the efficiency of the power system to get the maximum operating time from one or more batteries. [0003] The voltage produced by the battery is often not at the desired level, so voltage-to-voltage conversion is required. In order to minimize losses, DC / DC converters are used to perform this conversion (boost or buck conversion) in most cases. Coils or capacitor banks can be used. [0004] In particular, the present invention relates to DC / DC converters using capacitors as switching mechanisms. [0005] A capacitive boost converter operates using a charge pump. A voltage converter may have several charge pump stages arranged in cascade. When the switches drive the drivers of the first stage, the charge storage elements of the first stage are charged. In thi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
CPCH02M2001/0029H02M1/44H02M3/073H02M1/0029
Inventor 布拉姆·范斯特罗腾
Owner NXP BV
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