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Detection circuit for driving parallel resistors

A technology for detecting circuits and resistances, which can be used in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., and can solve problems such as wrong opening of power tubes.

Pending Publication Date: 2022-07-05
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the application, the power tube is turned on by mistake, and the consequences are serious

Method used

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  • Detection circuit for driving parallel resistors
  • Detection circuit for driving parallel resistors
  • Detection circuit for driving parallel resistors

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Embodiment Construction

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] The purpose of the present invention is to optimize the loop structure on the basis of the traditional structure, so that the circuit structure has wider applicability, which can be used for driving power MOS and driving GaN power transistors. The error caused by the current mirror adaptation is appropriately reduced, and the recognition accuracy is improved.

[0030] In order to make the above objects, features and advantages ...

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Abstract

The invention discloses a detection circuit for driving parallel resistors. The detection circuit comprises an operational amplifier, an external parallel resistor R, an MOS tube M1, an MOS tube M2, an MOS tube M3, an MOS tube M4, an MOS tube M5, an MOS tube M6, an MOS tube M7, an MOS tube M8, an MOS tube M9, a resistor Rz1, a resistor Rz2, a resistor Rz3, a resistor Rz4 and a logic circuit group. A clamping circuit is formed through an operational amplifier, and fixed voltage is applied to an external parallel resistor R of a driving pin, so that current information inversely proportional to the external parallel resistor R is generated. And then current comparison is carried out, the reference current for comparison is also from the clamping loop of the operational amplifier, the reference current is determined by the clamping circuit and the internal resistor, and the identifiable gear of the external parallel resistor R can be driven to be set through the internal resistors Ra, Rb and Rc. Due to the series connection of the resistor Rz1, a zero point changing along with the pole of the DRV end can be generated, so that the influence of the pole on the loop is compensated.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a detection circuit for driving a parallel resistance. Background technique [0002] The chip usually sets some parameters of the external programmable function, according to the external parallel resistance of the drive pin, to set the circuit of the relevant parameters of the circuit. The external parallel resistance of the drive is only detected during the startup phase, and is detected when the drive is not turned high. [0003] Method 1: The traditional method is to detect the resistance size by adding a current to the external resistance through the internal circuit. like figure 1 shown. The external parallel resistance of the DRV pin is the resistor R, and the internal circuit flows out a current of 1 ampere. The voltage of the DRV terminal VDRV=I*R volts, the comparator compares the DRV terminal voltage and a series of reference voltages to determine the r...

Claims

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Application Information

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IPC IPC(8): G01R27/14
CPCG01R27/14
Inventor 关晶晶冯林
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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