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Transmitter converting current to voltage

A transmitter and current conversion technology, applied in the direction of measuring current/voltage, measuring electrical variables, instruments, etc., can solve the problems of large volume, large conversion error, not suitable for high-density circuits, etc., achieve small size, improve conversion Accuracy, self-noise reduction effect

Active Publication Date: 2017-12-01
HAIYING ENTERPRISE GROUP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are 4-20mA to 0-5V modules on the market, they are very bulky and not suitable for high-density circuits; moreover, the conversion error is relatively large, so they are not suitable for occasions with high performance requirements.
Although Burr Brown once launched a dedicated conversion chip RCV420, the chip can only work at a temperature of 0°C to 70°C, which greatly limits the practicability of the chip

Method used

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  • Transmitter converting current to voltage

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Embodiment Construction

[0024] Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with aspects of the invention as recited in the appended claims.

[0025] The transmitter for converting current to voltage provided in the embodiment of the present invention includes a current source circuit U1, a current conversion circuit, and a voltage conversion circuit, wherein: the current source circuit is used to provide a stable DC current for the current conversion circuit; the current conversion circuit It is used to convert the input first current...

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Abstract

The invention discloses a transmitter converting current to voltage. The transmitter comprises a current source circuit, a current converting circuit, and a voltage converting circuit. The current source circuit is used to provide stable direct current for the current converting circuit. The current converting circuit is used to convert an input first current range to a second current range. The voltage converting circuit is used to convert the second current range to a preset voltage range. The transmitter is a universal transmitter which can convert a standard 4-20 mA current signal output by a sensor to a 0-5 V voltage signal which meets input requirements of an analog-digital converter. The transmitter is suitable to be used in operation temperature of 25 DEG C to 85 DEG C, and is small in volume and high in converting precision.

Description

technical field [0001] The invention belongs to the field of circuit design, in particular to a transmitter for converting current to voltage. Background technique [0002] In many industrial applications, sensors are needed, such as pressure sensors, temperature sensors, etc. In order to meet long-distance transmission and anti-interference, the output of most sensors is a standard 4-20mA current signal, but the input of the analog-to-digital converter ADC generally requires a 0-5V voltage signal. Although there are 4-20mA to 0-5V modules on the market, they are very bulky and not suitable for high-density circuits; moreover, the conversion error is relatively large, so they are not suitable for occasions with high performance requirements. Although Burr Brown Company once launched a dedicated conversion chip RCV420, the chip can only work at a temperature of 0°C to 70°C, which greatly limits the practicability of the chip. So the present invention designs a kind of. Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/2509
Inventor 宋亚明
Owner HAIYING ENTERPRISE GROUP
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