Data display instrument analog quantity output circuit

A technology of output circuit and analog quantity, applied in the direction of logic circuit connection/interface layout, etc., can solve the problems of non-linear output, complex structure of digital display meter, poor stability, etc., and achieve the effect of overcoming deviation

Inactive Publication Date: 2015-07-08
乐山一拉得电网自动化有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of transmission output is prone to deviation, poor stability, and the accuracy cannot meet the requirements, resulting in non-linear output
In addition, due to the large number of components required, the digital display meter that uses this method to realize the transmission output has a complex structure and a high failure rate

Method used

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  • Data display instrument analog quantity output circuit

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Embodiment Construction

[0012] Such as figure 1 As shown, the present invention includes an input terminal (VCA1 in the figure), an output terminal (VCC+ in the figure), a first resistor (R1 in the figure), a second resistor (R2 in the figure), and a third resistor (in the figure R3), fourth resistor (R4 in the figure), fifth resistor (R5 in the figure), sixth resistor (R6 in the figure), transistor (T1 in the figure), operational amplifier (U1 in the figure) . Its connection relationship is:

[0013] The inverting input terminal of the operational amplifier is connected to the single-chip microcomputer through the fourth resistor to output an analog signal, and is further connected to the output terminal through the third resistor and the first resistor in sequence. One end of the sixth resistor is grounded, the other end is connected to the non-inverting input end of the operational amplifier, and is connected to the output end through the second resistor. The output end of the operational ampl...

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PUM

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Abstract

The invention discloses a data display instrument analog quantity output circuit. An input end is connected with a data display instrument analog signal output end, the inverted input end of an operational amplifier is connected with the input end through one end of a fourth resistor, and the inverted input end is sequentially connected with a third resistor and a first resistor and then connected to an output end. One end of a sixth resistor is grounded, the other end of the sixth resistor is connected with a second resistor and then connected to the output end, and the positive phase input end of the operational amplifier is connected to a connecting line of the second resistor and the sixth resistor. The output end of the operational amplifier is connected to the base electrode of a triode through a fifth resistor, and the emitter electrode of the triode is connected to a connecting line of the first resistor and the third resistor. The virtual short circuit and virtual open circuit principle of the operational amplifier is utilized, so that the current in an external load is only decided by the output voltage signal of a single-chip microcomputer, and is not changed along with the change of the external load, and stable analog quantity output of a data display instrument is achieved.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to an analog output circuit of a digital display meter with good stability and high precision. Background technique [0002] At present, after collecting the electrical parameters, most digital display meters also need to transmit the electrical parameters to remote devices or terminals while displaying them. In the existing digital display meters, the usual practice is: directly convert various electrical parameters into small voltage signals, and convert and output through a large number of passive components. This kind of transmission output is prone to deviation, poor stability, and the accuracy cannot meet the requirements, resulting in non-linear output. In addition, due to the large number of components required, the digital display meter that uses this method to realize the transmission output has a complex structure and a high failure rate. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K19/0175
Inventor 左涛胡天祥吴晓林黎军华
Owner 乐山一拉得电网自动化有限公司
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