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a modem

A modem and signal modulation technology, used in output power conversion devices, electrical components, and AC power input to DC power output, etc. Improve the anti-interference ability, simplify the peripheral circuit, and achieve the effect of high integration

Active Publication Date: 2017-02-22
ZHEJIANG SUPCON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a modem to solve the problems of complex peripheral circuits of single-chip microcomputers, low integration and poor anti-interference ability in the prior art

Method used

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Embodiment Construction

[0046] The core of the present invention is to provide a modem, which realizes the communication between the control equipment and the smart instrument through the built-in ADC single-chip microcomputer and passive analog conditioning circuit, simplifies the communication circuit, and improves the anti-interference ability and integration degree.

[0047] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] Modem provided by the present invention, see figure 1 , including: a passive analog conditioning circuit 20 and a single-chip microcomputer 30 with a built-in ADC.

[0049]The passive analog conditioning circuit 20 is connected to the single-chip microcomputer 30 with built-in ADC. The passive analog conditioning circuit 20 is used to filter and load the first signal output by the ...

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Abstract

The embodiment of the invention provides a modulator-demodulator which is only composed of a single-chip microcomputer with a built-in ADC, and a passive analog conditioning circuit. The peripheral circuit is concise. Besides, the inter-conversion process of an analog signal and a digital signal is completed by the single-chip microcomputer with the built-in ADC. Furthermore, conversion of sine waveform to square waveform of the analog signal is not needed in the modulation-demodulation process, and a corresponding active analog conditioning circuit does not need to be arranged at the periphery of the single-chip microcomputer with the built-in ADC so that the peripheral circuit of the modulator-demodulator is greatly reduced and anti-interference capability of the system is enhanced. Meanwhile, an ADC sampling module and a signal modulation-demodulation circuit are integrated on the single-chip microcomputer with the built-in ADC, and other single-chip microcomputers do not need to be peripherally arranged for work of signal link layer parsing so that the modulator-demodulator also has higher integration level.

Description

technical field [0001] The invention relates to the field of industrial field bus communication, in particular to a modem. Background technique [0002] Fieldbus technology is a comprehensive technology widely used in industrial automation control systems with intelligent sensing, control, computer, and digital communication as its main content. Since its birth in the 1970s, it has been widely promoted due to its advantages in reducing system cables, simplifying system installation, maintenance and management, reducing system investment and operating costs, and enhancing system performance. The HART bus is mainly used to solve the problem of mutual communication between control equipment and smart instruments. It is compatible with traditional 4-20mA current loop signal transmission and is usually used in field industrial control equipment. [0003] At present, the realization of HART bus communication needs to rely on a general-purpose single-chip microcomputer to process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5395
Inventor 陈宇王文辉胡凯洪忠亮
Owner ZHEJIANG SUPCON TECH