High-side current sampling voltage expansion circuit

A technology of current sampling and circuit expansion, applied in the direction of measuring current/voltage, measuring only current, changing the range circuit, etc., can solve the problems of application limitation, the voltage cannot exceed the working voltage of the current detection IC, etc., to achieve high voltage and extended application voltage. The effect of range, high-side current sampling

Pending Publication Date: 2021-08-06
石家庄宇飞电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The withstand voltage of the high-side current detection IC is generally 20V-25V, so it cannot be used when it is higher than 25V.
figure 1 It is a typical circuit of the prior art, and the voltage of the circuit cannot exceed the operating voltage of the current detection IC, so the application is very limited

Method used

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  • High-side current sampling voltage expansion circuit
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Embodiment Construction

[0015] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0016] The present invention proposes a voltage expansion circuit for high-side current sampling, specifically a high-side current sampling circuit that is not limited by the withstand voltage of a high-side current detection IC.

[0017] Such as figure 2 As shown, the voltage expansion circuit for high-side current sampling in the embodiment of the present invention includes: sampling resistor R1, high-side current detection chip U1, drop-down resistor R2, MOS transistor Q1, Zener diode Z1 and current limiting resistor R3.

[...

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Abstract

The invention provides a high-side current sampling voltage expansion circuit which comprises a sampling resistor, a high-side current detection chip, a voltage dropping resistor, an MOS tube, a voltage stabilizing diode and a current limiting resistor, the two ends of the sampling resistor are connected with the input end of the high-side current detection chip, the sampling resistor is arranged on the high side, namely the positive electrode, of an output loop, the current is output to a load through the sampling resistor; the output end of the high-side current detection chip is connected to one end of the dropping resistor, and the other end of the dropping resistor is connected with the source electrode of the MOS tube; the grid electrode of the MOS tube is connected with one end of the current-limiting resistor, one end of the current-limiting resistor is further connected with the anode of the voltage-stabilizing diode, and the cathode of the voltage-stabilizing diode is connected with the anode of the circuit; the other end of the current-limiting resistor is grounded; and the drain electrode is used as a current output end.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a voltage expansion circuit for high-side current sampling. Background technique [0002] The high-side current sampling circuit can realize ground supply output, and is a very widely used circuit. In order to achieve high-precision sampling, a dedicated high-side current detection IC is generally used. The withstand voltage of the high-side current detection IC is generally 20V-25V, so it cannot be used when it is higher than 25V. figure 1 It is a typical circuit in the prior art, and the voltage of the circuit cannot exceed the working voltage of the current detection IC, so the application is very limited. Contents of the invention [0003] The aim of the present invention is to solve at least one of said technical drawbacks. [0004] Therefore, the object of the present invention is to propose a voltage expansion circuit for high-side current sampling. [00...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/08
CPCG01R19/0092G01R15/08
Inventor 李思斌
Owner 石家庄宇飞电子有限公司
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