Capacitor charge pump

A charge pump, capacitive technology, used in electrical components, conversion equipment without intermediate conversion to AC, and output power conversion devices, etc. The effect of simple voltage circuit, small number of capacitors and high efficiency

Inactive Publication Date: 2011-06-01
厦门联创微电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The volume occupied by capacitors is often easily limited in portable products. If the number of flying capacitors is increased one-sidedly, although the output voltage can meet the requirements, its huge volume makes it impractical.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] figure 1 It is a schematic diagram of the first embodiment of the present invention. There are three pumping circuits 1 to 3 in the figure, each pumping circuit includes a flying capacitor and two switches; pumping circuit 1 has capacitor C1 and switches S1, S5; pumping circuit 2 has capacitor C2 and switches S2, S7 , the pump stage circuit 3 has a capacitor C3 and switches S3 and S10. There is another switch network, which is composed of S9, S6, S8 and S11, and these three pump stage circuits in series together form a boost circuit. Another C4 is connected in parallel to filter between the output terminal Vout and the ground. For the convenience of description, the positive and negative terminals of the capacitors C1 to C3 are marked according to their initial charging and discharging polarities.

[0047] The realization of the flying capacitor is to rely on the opening and closing of each switch to make the capacitor form different charging and discharging networks...

Embodiment 2

[0061] In practical applications, the switch works at a higher frequency, usually using a control device with a switching function. Now, in a system on chip, a switching MOS tube can perform such a switching function. Such as Figure 6 In the circuit diagram of the second embodiment shown, this embodiment is integrated on the chip to achieve a small volume, and all MOS transistors are enhanced.

[0062] Basically, the source and drain of all MOS tubes directly replace the original figure 1 The position of the middle switch is different from the MOS transistor M6, which is realized by parallel connection of the sources and drains of four MOS transistors M61, 62, 63, and 64 with the same parameters.

[0063] Of course, to achieve Figure 6 For the functionality of the on-chip circuitry shown, there must also be a range of peripherals. Such as Figure 7 As shown, the boost circuit box in the figure is Figure 6 The content in the other is the external facilities commonly use...

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PUM

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Abstract

The invention discloses a capacitor charge pump, which comprises a booster loop consisting of flying capacitors and a switch, wherein the booster loop has a input end, an output end and a grounding end. The capacitor charge pump is characterized in that: the booster loop comprises a first flying capacitor, a second flying capacitor, a third flying capacitor and a switching program; and after the input end of the booster loop is connected with an input voltage, the flying capacitors and the switch circularly operate according to a four-step switching program, and an output voltage is 1.2 times that the input voltage is obtained at the output end. The booster loop of the 1.2-time boosting capacitor charge pump is simple and only needs three flying capacitor, and when the capacitor charge pump is used in light emitting diode backlight drive, the efficiency of the capacitor charge pump is high.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a boosted capacitive charge pump circuit. Background technique [0002] As a power conversion device, charge pumps are widely used. Capacitive charge pumps use capacitors to store energy and work at higher frequencies. Small ceramic capacitors are often used as energy storage components; this type of charge pump occupies less space. Small, low cost to use, and since no inductor is used, its radiated EMI can be ignored. The various advantages of the capacitive charge pump make it very suitable for portable applications, especially electronic devices that need to be powered by lithium batteries and illuminated by white LEDs. The voltage is lower than the working voltage of the LED and can no longer be discharged. This requires a corresponding booster circuit to be installed in the limited equipment space to increase the voltage of the lithium battery so that it can be fully discharged und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07H02M1/36
Inventor 熊守芬
Owner 厦门联创微电子股份有限公司
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