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A charge pump circuit

A charge pump and voltage detection circuit technology, applied in the field of circuits, can solve the problems of waste of power consumption and unstable output voltage, and achieve the effect of reducing waste of power consumption and stable output voltage

Active Publication Date: 2018-04-03
GIGADEVICE SEMICON (BEIJING) INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Every time the output voltage is detected, the current will be drawn from the output voltage terminal. If the output voltage is detected frequently, it will cause a lot of waste of power consumption. However, if the output voltage is detected every long time, the output voltage will be low. Will deviate greatly from the target voltage, making the output voltage very unstable

Method used

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Examples

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Embodiment 1

[0015] figure 1 It is a block diagram of a charge pump circuit provided by Embodiment 1 of the present invention, and this embodiment is applicable to low power consumption integrated circuits. A block diagram of a charge pump circuit provided in this embodiment, such as figure 1 As shown, it includes a voltage detection module, which is used to detect the output voltage of the charge pump under the control of the pulse signal, and outputs an enable signal to the charge pump, and starts the charge pump to start working; a counter is used to check the enable signal The enable period is timed, and when the enable period is lower than or higher than the set value, the frequency of the pulse signal generated by the waveform generator is adjusted; the waveform generator is used to generate the pulse signal to the voltage detection circuit under the control of the counter Refresh the detection frequency of the voltage detection circuit; the charge pump is used to output the target ...

Embodiment 2

[0023] On the basis of the above embodiments, as a preferred embodiment, image 3 The specific circuit diagram of the voltage detection circuit is given, as image 3 As shown: the voltage detection circuit is composed of a first resistor R0, a second resistor R1, a comparator D1, and an enabling switch KM_EN; wherein the first resistor R0 and the second resistor R2 are connected in series and one end is connected to the enabling switch The energy switch KM_EN is connected, and the other end is connected to the output terminal Vout of the charge pump; the non-inverting input terminal of the comparator D1 inputs the reference voltage Vref, and the inverting input terminal is connected to Vin between the first resistor and the second resistor. , the output end outputs the enable signal PUMP_EN.

[0024] Wherein, the reference voltage Vref is a set value, the enable switch KM_EN is a normally open switch, and only when the voltage detection circuit starts to detect the output vol...

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Abstract

The invention discloses a charge pump circuit, comprising: a voltage detection module for detecting the output voltage of the charge pump and outputting an enable signal to the charge pump; a counter for checking the enable period of the enable signal Timing, when the enable period is lower than or higher than the set value, adjust the frequency of the waveform generator to generate the pulse signal; the waveform generator generates the pulse signal to the voltage detection circuit to refresh the detection frequency of the voltage detection circuit; the charge pump is used for The target voltage is output under the control of the enable signal. The embodiment of the present invention adds a refresh frequency control function, the enable period of the enable signal is timed by a counter, and when the enable period is lower than or higher than the set value, the frequency of the pulse signal generated by the waveform generator is adjusted, and then the voltage The detection frequency of the detection module is refreshed and self-adjusted, and the waste of power consumption is minimized on the premise of ensuring the stability of the output voltage.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of circuits, and in particular to a charge pump circuit. Background technique [0002] As the basic module of the Flash memory, the charge pump circuit largely determines the programming / erasing speed of the Flash. With the continuous development of integrated circuits, based on the consideration of low power consumption and low cost, charge pump circuits are more and more widely used in integrated circuits. [0003] The basic working principle of the charge pump is to increase the output voltage of the charge pump through the accumulation effect of the capacitor on the charge. Due to the existence of leakage current, the charge pump needs a detection circuit to detect the output voltage. When the output voltage is lower than the target voltage, the charge pump starts to work and raises the output voltage to the target voltage. Every time the output voltage is detected, the curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07
Inventor 陈晓璐
Owner GIGADEVICE SEMICON (BEIJING) INC
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