Digital-to-analog converter

A technology of digital-to-analog conversion and voltage-to-current conversion, applied in the direction of digital-to-analog converters, etc., can solve the problems of complex voltage conversion current circuit structure, small current signal adjustment range, increased production costs, etc., to achieve programmable control, enhanced resistance Interference ability, cost-saving effect

Active Publication Date: 2012-07-25
CHENGDE DINGXIN AUTOMATION ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are following deficiencies in this traditional way: (1) can only realize single output
After the digital-to-analog converter converts the digital signal into a voltage signal, it can only output one voltage signal. When two voltage signals need to be output, two digital-to-analog converters must be configured to achieve it, which will increase production costs.
(2) The structure of the voltage conversion current circuit is complex and can only realize the conversion of a single voltage signal. Although the circuit structure of the voltage conversion current chip is simple and easy to configure, it is expensive and the adjustment range of the current signal is small.

Method used

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Embodiment Construction

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Please refer to figure 1 as shown, figure 1 A block diagram of a digital-to-analog conversion device provided by an embodiment of the present invention.

[0024] The digital-to-analog conversion device in this embodiment includes: an isolation unit 101 , a digital-to-analog conversion unit 102 and a voltage-to-current conversion unit 103 . The voltage-current conversion unit 103 includes: a conversion circuit 1031 and a filter circuit 1032 .

[0025] The isolation unit 101 is connected to the central processing unit 104 and is used for inputting the digital signal from the central processing unit 104 into the digital-to-analog conversion unit 102 through an optocoupler.

[0026] The digital-to-analog conversion unit 102 is connected to the isolati...

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Abstract

The invention discloses a digital-to-analog converter, comprising an isolating unit, a digital-to-analog conversion unit and a voltage and current conversion unit. The voltage and current conversion unit comprises a conversion circuit and a filter circuit. The digital-to-analog converter disclosed by the invention not only enhances anti-jamming capability, and realizes programmable control of signal output, a voltage current conversion chip is not required, and a voltage signal can be converted into a current signal only a conversion circuit consisting of an operational amplifier, a triode, a capacitor and a resistor, so that a circuit structure is simplified and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of automatic control circuits, in particular to a digital-to-analog conversion device. Background technique [0002] At present, the weighing of domestic solid materials generally adopts dynamic weighing instruments, which are used to measure the amount of materials and control the feeding speed to achieve the purpose of automatic control and automatic measurement. Dynamic weighing instruments are divided into belt scale instruments, feeder instruments, loss-in-weight instruments, rotor scale instruments, etc. according to the feeding method. Weighing instruments are widely used in cement, mining, metallurgy, coal, building materials, chemicals, ceramics, and grain. , light industry, electric power and other industries. In the process of automatic control of the dynamic weighing instrument, the transmission mode of the analog output has two kinds of current and voltage. Since the current can be transmitted ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
Inventor 王东壮
Owner CHENGDE DINGXIN AUTOMATION ENG
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