Method for implementing charge pump keeping constant output current, and charge pump thereof

A technology of output current and implementation method, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve the problems of poor output voltage stability, poor circuit performance, affecting chip performance parameters, etc., and achieve stable output voltage. Good performance, low cost, and the effect of improving stability

Active Publication Date: 2011-09-14
XI AN UNIIC SEMICON CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Poor output voltage stability will also lead to poor circuit performance of subsequent power modules, affecting the performance parameters of the entire chip, such as timing performance, speed performance parameters, etc.

Method used

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  • Method for implementing charge pump keeping constant output current, and charge pump thereof
  • Method for implementing charge pump keeping constant output current, and charge pump thereof
  • Method for implementing charge pump keeping constant output current, and charge pump thereof

Examples

Experimental program
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Embodiment Construction

[0031] According to the working principle of the charge pump, the output current of the charge pump increases with the increase of the external input voltage, see figure 1 ; At the same time, the output current of the charge pump also increases with the increase of the clock oscillation frequency, see figure 2 .

[0032] The invention dynamically detects the external input voltage, selects the corresponding clock oscillation frequency according to the magnitude of the external input voltage, makes the output current of the charge pump constant, reduces the output voltage ripple of the charge pump, and improves the stability of the output voltage. Implementation method of the present invention is as follows:

[0033] (1.1) Design the main circuit of the charge pump according to the external minimum voltage value.

[0034] (1.2) Compare the external input voltage of the main circuit of the charge pump with the reference voltage.

[0035] The external voltage detection circui...

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PUM

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Abstract

The invention discloses a method for implementing a charge pump keeping constant output current, and the charge pump thereof. The method comprises the following steps of: comparing external input voltage of a charge pump main body circuit with reference voltage, and inputting a comparison result into a clock generating circuit to output corresponding clock oscillation frequency, so that the charge pump main body circuit outputs constant current. The output of the charge pump main body circuit is connected to an enable end of the charge pump main body circuit through a voltage feedback and comparison circuit. The external voltage is dynamically detected, and when the external voltage changes, corresponding clock oscillation frequency can be selected according to the external input voltage,so that the charge pump outputs constant current. Therefore, the output voltage ripple of the charge pump is reduced, and the output voltage stability is improved. The charge pump is simple in implementation mode and structure and low in cost.

Description

technical field [0001] The invention belongs to the field of electronic chip charge pumps, and relates to a method for realizing a charge pump that maintains a constant output current and a charge pump that uses the method to maintain a constant output current. Background technique [0002] The charge pump circuit is widely used in various electronic chips. Its principle is to use the charge accumulation effect on the capacitor to generate a voltage higher than the input voltage. Typically, a one-stage charge pump can provide a maximum voltage that is twice the input voltage, and a two-stage charge pump can provide a maximum voltage that is three times the input voltage. [0003] A charge pump system generally mainly includes three circuit modules: a clock oscillator, a feedback circuit, a comparator circuit, and a charge pump main circuit. The clock oscillator generates a clock signal to charge the main circuit of the charge pump; the output voltage is determined through t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/46
Inventor 贾雪绒
Owner XI AN UNIIC SEMICON CO LTD
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