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Charge pump and voltage detection circuit thereof

A technology of output voltage detection and output voltage, which is applied in the direction of measuring current/voltage, measuring device, measuring electric variable, etc., can solve the problems of low reliability and complex structure, so as to improve reliability and simplify the related circuits of the comparator Effect

Active Publication Date: 2017-05-10
SHANGHAI BEILING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of complex structure and low reliability of the output voltage detection circuit of the charge pump with positive and negative output voltages in the prior art, and provide a simple structure, easy to implement and reliable High charge pump output voltage detection circuit and charge pump

Method used

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  • Charge pump and voltage detection circuit thereof
  • Charge pump and voltage detection circuit thereof
  • Charge pump and voltage detection circuit thereof

Examples

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Embodiment 1

[0033] Such as Figure 4 As shown, an output voltage detection circuit 3 of a charge pump includes a first comparator 301, a second comparator 302, a third comparator 303, a first resistor R1, a second resistor R2, a third resistor R3, a fourth Resistor R4 and fifth resistor R5; one end of the first resistor R1 is electrically connected to the reference voltage V_bandgap, the other end of the first resistor R1 is electrically connected to one end of the second resistor R2 and the negative input end of the first comparator 301, and the second The other end of the resistor R2 is electrically connected to one end of the third resistor R3 and the negative input end of the second comparator 302, the other end of the third resistor R3 is electrically connected to the negative output voltage terminal V_N of the charge pump, and the first comparator 301 The positive input terminal and the positive input terminal of the second comparator 302 are respectively grounded to GND; one termin...

Embodiment 2

[0037] Such as Figure 6 As shown, a charge pump includes an output voltage charging circuit, the charging circuit includes a control circuit 1 and a main topology circuit 2, and the charge pump also includes an output voltage detection circuit 3 of the charge pump in Embodiment 1, a positive voltage overload comparison The device 4 and the negative voltage overload comparator 5; the output voltage charging circuit is used to control the charging of the positive output voltage terminal V_P and the negative output voltage terminal V_N of the charge pump. The first comparator outputs a first control signal V_N_dectect, when the voltage of the positive input terminal of the first comparator is higher than the voltage of the negative input terminal of the first comparator, the signal V_N_dectect is used to notify the output voltage charging circuit to stop the negative output of the charge pump The voltage terminal V_N is charged; the third comparator outputs a second control sign...

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Abstract

The invention discloses a charge pump and a voltage detection circuit thereof. The output voltage detection circuit of the charge pump comprises first and second comparators and first, second and third resistors; one end of the first resistor is electrically connected with a reference voltage, the other end of the first resistor is electrically connected with one end of the second resistor and a negative input end of the first comparator, the other end of the second resistor is electrically connected with one end of the third resistor and a negative input end of the second comparator, the other end of the third resistor is electrically connected with a negative output voltage end of the charge pump, and a positive input end of the first comparator and a positive input end of a second comparator are grounded; and both the voltage of the negative input end of the first comparator and the voltage of the negative input end of the second comparator are greater than -1V. According to the invention, related circuits of comparators in the voltage detection circuit in the negative output voltage end of the charge pump are simplified, and the reliability of the whole circuit is improved.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to an output voltage detection circuit of a charge pump and the charge pump. Background technique [0002] Charge pumps with positive and negative output voltages need an output voltage detection circuit, which is used to detect whether the voltage value of the positive and negative output voltage terminals of the charge pump reaches the desired voltage value, so as to determine when to stop charging the positive and negative output voltage terminals . Such as figure 1 The shown capacitive charge pump (charge pump) mainly includes three circuits, respectively the main topology circuit 2, the control circuit 1 and the output voltage detection circuit 3, wherein the main topology circuit 2 and the control circuit 1 constitute the charge pump. charging circuit. main topology circuit 2 such as figure 2 As shown, there are two output voltage terminals 201, 202, positive and negati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/165H02M3/07
CPCG01R19/16576H02M3/07
Inventor 赵海亮陶园林常祥岭谢雪松
Owner SHANGHAI BEILING