High-precision current sampling circuit used in servo system

A current sampling and servo system technology, applied in the direction of measuring current/voltage, voltage/current isolation, measuring electrical variables, etc., can solve the problems of low accuracy and poor linearity, and achieve electrical isolation, simple circuit and low cost. Effect

Inactive Publication Date: 2010-11-03
HANGZHOU RIDING CONTROL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention solves the problems of poor linearity and low precision in existing current sampling circuit

Method used

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  • High-precision current sampling circuit used in servo system
  • High-precision current sampling circuit used in servo system

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Embodiment Construction

[0025] refer to figure 1 , a high-precision current sampling circuit used in a servo system, including an integrated Hall current sensor circuit 1, an operational amplifier circuit 2, and a clamping circuit 3, and the current sampling channel of the integrated Hall current sensor circuit 1 is connected in series to the servo In the phase wire of the motor, the current signal of the phase wire is converted into a proportional analog voltage signal;

[0026] The output terminal of the integrated Hall current sensor circuit 1 is connected to the in-phase terminal of the operational amplifier circuit 2, and the operational amplifier circuit 2 amplifies the voltage signal and converts the level;

[0027] The output end of the operational amplifier 2 is connected to the clamping circuit 3, and the clamping circuit 3 protects the voltage signal from being input to the analog-to-digital conversion unit of the DSP.

[0028] The integrated Hall current sensor circuit 1 includes an inte...

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Abstract

The invention discloses a high-precision current sampling circuit used in a servo system. The circuit comprises an integrated Hall current sensor circuit, an operational amplifier and a clamping circuit, wherein a current sampling channel of the integrated Hall current sensor circuit is connected with a phase line of a servo motor in series so as to convert a current signal of a phase line into an analogue voltage signal in a proportional relation; the output end of the integrated Hall current sensor circuit is connected with an in-phase end of the operational amplifier; the operational amplifier amplifies the voltage signal and performs level conversion; the output end of the operational amplifier is connected with the clamping circuit; and a clamping circuit protection voltage signal is input into an analog-to-digital conversion unit of a DSP. The high-precision current sampling circuit has the advantages of high linearity and high precision.

Description

technical field [0001] The invention relates to a current sampling circuit for electronic circuits. Background technique [0002] Digital AC servo system is widely used in light industry textile machinery, various CNC machine tools and other automatic assembly lines. When implementing its control algorithm, it is necessary to sample the phase current of the servo motor and participate in the calculation. The sampling circuit of the current AC servo system mainly uses the current Hall, the current sampling resistor and the linear optocoupler to realize the sampling of the phase current of the AC servo motor. For the first method, the current Hall is connected in series in the phase line of the servo motor, and its current signal output is amplified by the operational amplifier, and then the analog current signal is converted into a digital signal output by the AD analog-to-digital conversion chip. This kind of sampling circuit has the disadvantages of large size and high co...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/20
Inventor 覃海涛邵玉震吕晓东何恰
Owner HANGZHOU RIDING CONTROL TECH
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