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Charge pump circuit and its control circuit and control method

A control circuit and charge pump technology, applied in the electronic field, can solve the problems of increasing chip area, reducing efficiency, increasing chip power consumption, etc., and achieve the effect of increasing output current, reducing equivalent internal resistance, and fast response speed

Active Publication Date: 2017-08-15
NANJING SILERGY SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] On the one hand, the existing technology achieves this by increasing the capacitance, but increasing the capacitance will also increase the area of ​​the chip, which is not conducive to high power density;
[0010] On the other hand, the existing technology increases the operating frequency input to the charge pump circuit, but increasing the frequency will increase the power consumption of the chip, resulting in a decrease in efficiency

Method used

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  • Charge pump circuit and its control circuit and control method
  • Charge pump circuit and its control circuit and control method
  • Charge pump circuit and its control circuit and control method

Examples

Experimental program
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Effect test

Embodiment 1

[0073] figure 2 For a schematic flowchart of a control method of a charge pump circuit provided in this embodiment, see figure 2 As shown, the method mainly includes:

[0074] Step 201: Detect the difference between the output voltage and the input voltage of the charge pump circuit in real time.

[0075] In this embodiment, the input voltage Vin and the output voltage Vo are introduced into the control circuit, and the difference between the output voltage Vo and the input voltage Vin is detected in real time, which is expressed as ΔV=Vo−Vin.

[0076] Step 202: Compare the difference between the current output voltage and the input voltage with a predetermined expected value of the difference, and output an error amplification signal.

[0077] In this embodiment, an expected difference value is set according to the difference between the expected output voltage Vo and the input voltage Vin, denoted as ΔVth. When the difference between the output voltage Vo and the input ...

Embodiment 2

[0085] Figure 4 For a schematic structural diagram of a control circuit of a charge pump circuit provided in this embodiment, see Figure 4 As shown, the control circuit mainly includes: an error detection feedback circuit 401 , an error amplification circuit 402 , and a control voltage signal generation circuit 403 .

[0086] The connection relationship and working principle are that the error detection feedback circuit 401 is connected to the charge pump circuit (which can be but not limited to figure 1 or Figure 7 or image 3 As shown) the input voltage Vin and the output voltage Vo (which can be obtained by sampling, but not limited to), the error detection feedback circuit 401 detects the difference ΔV between the output voltage Vo and the input voltage Vin in real time, and outputs an error feedback signal Vb, the error The feedback signal Vb is used to represent the difference ΔV between the current output voltage Vo and the input voltage Vin, and the error feedbac...

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Abstract

A charge pump circuit and its control circuit and control method. The method includes: detecting the difference between the output voltage of the charge pump circuit and the input voltage in real time, comparing the current difference between the output voltage and the input voltage with a predetermined expected value of the difference, and outputting an error amplification signal; Generate a control voltage signal for controlling the charge pump circuit according to the error amplification signal, so that when the difference is greater than the expected value of the difference, the frequency of the control voltage signal changes positively with the difference , until the difference converges to the expected value of the difference. The application of this technical scheme can not only improve the response speed of the charge pump circuit, but also reduce the steady-state power of the circuit, which is beneficial to the miniaturization and integration of the chip.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a charge pump circuit and its control circuit and control method. Background technique [0002] The charge pump is also called: switched capacitor voltage converter, which is a kind of DC-DC (direct current to direct current converter) that uses "fast" (flying) capacitors (also known as "pumping" capacitors) to store energy. output the desired DC output voltage. [0003] Since the charge pump circuit can implement a voltage converter without an inductor or a transformer, it is easy to realize miniaturization and integrated chip of power management, so it is more and more popular. [0004] Under the control of the input voltage control signal, the charge pump circuit realizes the "capacitance-to-charge" direction from the input side of the input voltage to the output side of the output voltage by turning on and off a series of switches in the charge pump circuit. Pumping" to achieve o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
CPCH02M3/07H02M1/0022
Inventor 卓盛龙
Owner NANJING SILERGY SEMICON TECH CO LTD
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