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Current detection circuit

A current detection circuit and current technology, applied in the field of non-electricity and weak signal detection, radio communication, can solve the problems of increasing the on-resistance of the H-bridge, inaccurate measurement results, increasing the power consumption of the motor, etc., and achieve the on-resistance The effect of small size, high measurement accuracy and low chip cost

Pending Publication Date: 2022-03-11
SHENYANG POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resistance will change with temperature and process changes, resulting in inaccurate measurement results
If the off-chip standard resistor is used, the cost of the chip will be greatly increased
At the same time, adding a resistor R will increase the on-resistance of the H-bridge, thereby increasing the power consumption of the motor

Method used

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Embodiment

[0021] A current detection circuit that directly samples as figure 1 There is no need to add a sampling resistor R for the drain current of the low-end tubes M3' and M4' of the middle H bridge. Such as figure 2 As shown, the circuit is mainly composed of H-bridge current acquisition, feedback loop, cascode current mirror, protection circuit and current reduction circuit. Among them, the H-bridge current acquisition is based on the principle that the drain terminal voltage of the NMOS tube increases with the current. The cascode current mirror utilizes the shielding characteristics of the cascode structure to reduce the influence of the power supply voltage. The feedback loop is the core part of this circuit, and its main idea is to make the voltages of two points equal through feedback, so as to realize the proportional relationship of the current. The protection circuit is to prevent the voltage from exceeding the withstand voltage of the tube. Current reduction is to us...

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Abstract

A current detection circuit is composed of an H-bridge current collector, a feedback loop, a cascode current mirror, a protection circuit and a current reduction circuit. Wherein the H-bridge current collection is based on the principle that the drain end voltage of the NMOS tube is increased along with the current. The cascode current mirror utilizes the shielding characteristic of a cascode structure to reduce the influence of power supply voltage. The feedback loop is the core part of the circuit, and the main idea of the feedback loop is that voltages at two points are equal through feedback, so that the proportional relation of current is realized. The protection circuit is used for preventing overlarge voltage from exceeding withstand voltage of the tube. The current reduction uses the proportional relation of the current mirror to reduce the current so as to reduce the power consumption.

Description

technical field [0001] The invention belongs to the technical field of radio communication, non-electrical quantity and weak signal detection, relates to the detection of the inductance current of a stepping motor, in particular to a current detection circuit. Background technique [0002] The current detection circuit of the stepping motor often needs to add a sampling resistor R to the H bridge, and then sample the voltage across the resistor R to obtain the corresponding current. However, the resistance will change with temperature and process changes, resulting in inaccurate measurement results. If an off-chip standard resistor is used, the cost of the chip will be greatly increased. At the same time, adding the resistor R will increase the on-resistance of the H-bridge, thereby increasing the power consumption of the motor. Therefore, it is necessary to design a current detection circuit that does not need to add a resistor. Contents of the invention [0003] Purpo...

Claims

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Application Information

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IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 乔文虎辛晓宁庞景航任建
Owner SHENYANG POLYTECHNIC UNIV