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AD (Analog/Digital) sampling circuit

A technology of sampling circuit and sampling voltage, which is applied in the direction of analog-to-digital converters, etc., and can solve the problems of AD sampling accuracy loss and other issues

Inactive Publication Date: 2012-12-26
SHANGHAI STEP ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect of the loss of AD sampling accuracy caused by the small fluctuation range of the actual analog signal when the range of the fixed transformation ratio and the analog signal entering the AD converter in the prior art is fixed, and provides An AD sampling circuit, through segmental design of the AD sampling range, improves the AD sampling accuracy of small signals

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  • AD (Analog/Digital) sampling circuit

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Embodiment Construction

[0021] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.

[0022] The AD sampling circuit of the present invention adopts segmented different transformation ratio methods to improve sampling accuracy. When sampling an analog signal, the signal is divided into several sections. The smaller section of the analog signal adopts a larger transformation ratio. The smaller the transformation ratio, the more segments there are, the higher the accuracy when the current is smaller.

[0023] In this embodiment, the sampling voltage is divided into two sections to illustrate the principle of improving the sampling accuracy by the segmented method with different transformation ratios of the present invention.

[0024] Such as figure 1 As shown, the AD sampling circuit of this embodiment includes a voltage amplifier 11 and a voltage amplifier 12 , a CPU2 (pr...

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Abstract

The invention discloses an AD (Analog / Digital) sampling circuit, which comprises a plurality of voltage amplifiers for amplifying a sampling voltage, wherein all the voltage amplifiers are different in amplification times, an AD converter is respectively connected to each voltage amplifier, and the amplified sampling voltage is converted into a digital signal by the AD converter; and each voltage amplifier further comprises a reference voltage, and the voltage amplifier adjusts the amplified sampling voltage to be more than 0V through the reference voltage. According to the AD sampling circuit, the AD sampling precision of a small signal is improved by carrying out step-by-step design on the AD sampling range.

Description

technical field [0001] The present invention relates to an AD sampling circuit (analog-digital sampling circuit), in particular to an AD sampling circuit for motor control. Background technique [0002] AD sampling refers to the conversion of analog quantities into digital quantities through a certain circuit. Analog quantities can be electrical signals such as voltage and current, or non-electrical signals such as pressure, temperature, humidity, displacement or sound. But before the AD conversion, the input signal input to the AD converter must be converted into a voltage signal by various sensors. [0003] In industrial applications, especially in order to better control the operation of the motor, it is usually necessary to convert the current of the motor from analog to digital, that is, to perform AD sampling on the current of the motor. There are many ways of current sampling, but when entering the AD converter, the current will be converted into voltage, and the vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
Inventor 王春祥金辛海庞忠浩张永红
Owner SHANGHAI STEP ELECTRIC