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, high efficiency and small number of capacitors

Inactive Publication Date: 2013-01-02
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 pump stage loops 1 to 3 in the figure, each pump stage loop includes a flying capacitor and two switches; pump stage loop 1 has capacitor C1 and switches S1, S5; pump stage loop 2 has capacitor C2 and switches S2, S7 , the pump stage loop 3 has a capacitor C3 and switches S3 and S10. Another switch network is composed of S9, S6, S8 and S11, which together with the three pump-stage loops in series constitute a booster circuit. Another C4 is connected in parallel between the output Vout and ground for filtering. For the convenience of description, the capacitors C1 to C3 are marked with positive and negative terminals according to their initial charge and discharge 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 charge and discharge networks within a certain period, an...

Embodiment 2

[0061] In practical applications, the switch works at a higher frequency, and usually a control device with a switch function is used. Now, in a system-on-chip, the switch MOS tube can be competent for such a switch function. like Image 6 As shown in the circuit diagram of the second embodiment, this embodiment is integrated on the chip, realizing the miniaturization, and all MOS transistors are enhanced type.

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

[0063] Of course, to achieve Image 6 The functionality of the on-chip circuit shown, but also a series of peripherals must be present. like Figure 7 As shown, the boost circuit block in the figure is Image 6 The contents of the , the rest are external facilities common...

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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, among which capacitive charge pumps use capacitors to store energy, work at higher frequencies, and often use small ceramic capacitors as energy storage components; this type of charge pump takes up space Small, low cost, and since no inductor is used, its radiated EMI can be ignored. The various advantages of capacitive charge pump make it very suitable for portable applications, especially electronic equipment that needs 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, which requires a corresponding boost circuit in the limited equipment space to increase the voltage of the lithium battery so that it can be fully discharged under the conditions suita...

Claims

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Application Information

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Patent Type & Authority Patents(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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