Current detection circuit and device applied to load resistor

A technology of current detection circuit and load resistance, applied in the direction of measuring current/voltage, measuring device, measuring electrical variables, etc., can solve the problems of difficult precision system application, low control accuracy, etc., to increase low-frequency gain and increase output impedance , the effect of increasing stability

Active Publication Date: 2021-11-19
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The series resistance current detection circuit requires a current sampling and holding circuit, and the control accuracy is not high, so it is difficult to apply in precision systems

Method used

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  • Current detection circuit and device applied to load resistor
  • Current detection circuit and device applied to load resistor
  • Current detection circuit and device applied to load resistor

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Embodiment Construction

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] For ease of understanding, see figure 1 and figure 2 , the present invention provides an embodiment of a current detection circuit applied to a load resistance, including a rail-to-rail transconductance operational amplifier circuit GM and an output loop;

[0038] The input end of the rail-to-rail transconductance operational amplifier...

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Abstract

The invention discloses a current detection circuit and device applied to a load resistor. The current detection circuit comprises more than two groups of power supply processing circuits and a single-pole switch; each group of power supply processing circuit comprises a diode, a pull-up resistor and an MOS tube; the diode cathode of each group of power supply processing circuit is connected with one end of the single-pole switch, the anode is connected with the G pole of the MOS tube, the other end of the single-pole switch is grounded, one end of the pull-up resistor is connected with the positive end of an access power supply, the negative end of the access power supply is grounded, the S pole of the MOS tube is connected with the positive end of the access power supply, the D pole is connected with the positive end of an output power supply, and the negative end of the output power supply is grounded. The technical problems that a power supply control circuit of an electronic product with a multi-path input power supply uses a switch with a control end and a multi-path connecting end, so that the circuit is large in size, high in device cost and not beneficial to popularization and application are solved.

Description

technical field [0001] The invention relates to the technical field of current detection circuits, in particular to a current detection circuit and equipment applied to load resistors. Background technique [0002] The series resistance detection structure is a commonly used current detection method. The traditional series resistance detection structure is as follows: Figure 7 as shown, Figure 7 Among them, AMP is an operational amplifier, MP1 is a P-type MOS tube, R1, R2, and R3 are resistors, and R1=R2, V SENSE is the amplified sampling voltage, V IN is the load line of the power system, R SENSE is the resistance connected in series to the load line, I LOAD is the load current. The series resistance current detection circuit needs a current sampling and holding circuit, and the control accuracy is not high, so it is difficult to be applied in a precision system. Contents of the invention [0003] The invention provides a current detection circuit and equipment appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/00
Inventor 杨朝龙张志浩章国豪刘斌
Owner GUANGDONG UNIV OF TECH
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