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A capacitive dc-dc converter

A DC-DC, capacitor technology, applied in the field of DC-DC converters, to achieve the effect of enhanced regulation and protection

Inactive Publication Date: 2011-10-05
NXP BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] So far there has been no satisfactory solution that effectively combines the advantages of a capacitive converter with continuously variable control of the ratio of input voltage to output voltage or supply voltage to load voltage

Method used

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  • A capacitive dc-dc converter
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  • A capacitive dc-dc converter

Examples

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Embodiment Construction

[0038] figure 1 A simple schematic circuit diagram of a capacitive DC-DC converter according to the prior art is depicted. A voltage Vin is applied across the inputs 100, 101, and the load resistor R L Current is drawn through the voltage of outputs 111 , and 110 . Across the inputs 100, 101 via a switch is a charge pump capacitor C1. Switch S1 connects the first electrode 131 of capacitor C1 to the high side 101 of the input and switch S2 connects the second electrode 132 of capacitor C1 to the low side 100 of the input. Switches S4 and S3 respectively connect the first electrode 131 and the second electrode 132 of the charge pump capacitor C1 to the high side 111 of the voltage output. A second capacitor C2 is connected between the high side 111 and the low side 110 of the output.

[0039] In the operation of the capacitive converter, in a first phase, a control unit (not shown) sets all the odd-numbered switches to their conducting state, ie the closed state. That is, ...

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PUM

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Abstract

A charge-pump capacitive DC-DC converter (200) is disclosed, which includes a reconfigurable charge-pump capacitor array. The DC-DC converter is configured to provide a continuously variable ratio between its input voltage (Vin) and its output voltage (Vout), by means of at least one of the at least one charge-pump capacitors (C21, C22) forming the reconfigurable array being a variable capacitor. In the embodiments, the one or more variable capacitors (C21, C22) may be a ferroelectric capacitor, an anti-ferroelectric capacitor, or other ferrioc capacitor. The DC-DC converter (200) may provide a bias circuit to the capacitor or capacitors, and may further provide a control loop (220, 230). Alternatively, the capacitor may provide a degree of self-control.

Description

technical field [0001] The present invention relates to DC-DC converters. The present invention is particularly concerned with charge pump capacitive DC-DC converters, and methods of controlling such DC-DC converters. Background technique [0002] An easy way to provide a load with a voltage lower than the available supply voltage is through a linear regulator. A linear regulator is basically a controllable resistor in series with the load. However, as the load voltage decreases relative to the supply voltage, the voltage required to drop through the controllable resistor increases. The power dissipated in the controllable resistor increases and the overall efficiency of the regulator decreases. Thus linear regulators are inefficient although they allow a wide range of independent supply and load voltages. [0003] An alternative solution that is being used more and more is a switch-mode power supply or DC-DC converter. Instead of resistive elements, reactive elements a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
CPCH02M3/07
Inventor 克劳斯·雷曼威廉·弗雷德里克·亚德里亚内斯·贝什林亨德里克·约翰内斯·伯格维德帕维尔·诺沃塞罗夫
Owner NXP BV
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