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
CN113671236AActive Publication Date: 2021-11-19GUANGDONG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG UNIV OF TECH
Publication Date
2021-11-19

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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.
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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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