Switching capacitor type DC-DC converter

A technology of DC converters and switched capacitors, applied in the direction of conversion equipment without intermediate conversion to AC, electrical components, output power conversion devices, etc., can solve problems such as large output ripples, and achieve low output ripples and output voltages. Ripple reduction, high efficiency effect

Inactive Publication Date: 2009-07-08
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention provides a switched capacitor DC-DC converter with high efficiency and can automatically adjust the working frequency, which overcomes the technical problem of large output ripple caused by discontinuous working frequency

Method used

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  • Switching capacitor type DC-DC converter
  • Switching capacitor type DC-DC converter
  • Switching capacitor type DC-DC converter

Examples

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Embodiment Construction

[0025] Such as figure 2 The shown converter includes an output sampling branch composed of a voltage dividing resistor 13 and a voltage dividing resistor 14 connected to the voltage output terminal 16, an error amplifier 1 receiving the sampling voltage signal and a reference voltage signal 15, and a receiving error amplifier 1 A voltage-controlled oscillator 2 that outputs the output voltage signal of the corresponding frequency clock signal, a dead zone control module 3 that generates multiple sets of non-overlapping clock signals, and a multiple sets of non-overlapping clocks sent by the dead zone control module 3 signal to the switched capacitor array module 4 .

[0026] A feedback branch composed of a resistor 5 and a capacitor 6 in series is connected across the input terminal and output terminal of the sampling voltage signal of the error amplifier 1 . The increasing direction of the output voltage of the error amplifier 1 is opposite to the increasing direction of th...

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Abstract

The invention provides a switched capacitor DC-DC converter. The switched capacitor DC-DC converter comprises an output sampling branch, a dead area control module for generating the dead area and outputting multiunit clock signals which has the same frequency as the input clock, a switched capacitor array module for receiving multiunit clock signals which are not overlapped and sent by the dead area control module, an error amplifier for receiving the voltage signal from the output sampling branch and the reference voltage signals, and a voltage controlled oscillator for receiving the output voltage signals of the error amplifier and for outputting the clock signals with corresponding frequency. The voltage controlled oscillator sends the clock signals to the dead control module. The frequency variation of the clock signals is in proportion to the output voltage variation of the error amplifier. The converter has low output voltage ripple and high efficiency in full load range.

Description

technical field [0001] The invention relates to a switched capacitor type DC-DC converter. Background technique [0002] Now all kinds of portable electronic devices are going to millions of households and various industrial applications. No matter what kind of electronic devices and chips are used in these devices, power management modules are indispensable, and these devices have higher and higher requirements for their power management modules. Usually, these portable devices, such as mobile phones, MP3 / 4 and digital cameras, require power management modules with small size, high power conversion efficiency, small output ripple, low cost, and simple application circuits. At the same time, the current consumed by portable electronic devices is also very unstable, depending on the operating environment and status of the device (such as MP4 playing video, the power consumption is large, and the power consumption is small when it is in standby mode), so a good power manageme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07H02M1/14
Inventor 吴晓波严冬勤赵梦恋陈明阳
Owner ZHEJIANG UNIV
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