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Digital display direct current meter

A current and output terminal technology, applied in the field of digital display DC meters, can solve the problems of poor safety, poor anti-interference ability, small range of digital display DC meters, etc., to increase attenuation and filtering, reduce interference, and improve EMC anti-interference effect of ability

Inactive Publication Date: 2020-02-07
MIANYANG WEIBO ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a digital display DC meter, which solves at least one of the problems of the digital display DC meter such as small range, poor safety and poor EMC anti-interference ability

Method used

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Examples

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Embodiment 1

[0039] In this embodiment, a digital display DC meter is provided, such as figure 1 As shown, a digital display DC meter, the digital display DC meter includes a current sampling circuit, a voltage sampling circuit, a digital power supply module, an analog power supply module, a processor and a display, wherein the input terminal of the voltage sampling circuit is connected to the detected voltage, The output end is connected to the processor; the input end of the current sampling circuit is connected to the detected current, and the output end is connected to the processor; the digital power supply module, the analog power supply module and the display are all connected to the processor; the voltage sampling circuit and the current sampling circuit are connected to the The power supply voltage is connected to VCC; the processor adopts STM32F103C8T6, and at the same time, in order to reduce power consumption, the internal oscillator and internal A / D of the processor are used, a...

Embodiment 2

[0043] On the basis of Embodiment 1, this embodiment further improves the voltage sampling circuit, such as figure 2 As shown, a voltage sampling circuit of a digital display DC meter includes an input voltage divider module, an input filter module, an isolation amplifier module, a voltage conditioning module, and an output filter module. The input terminal of the input voltage divider module is connected to the detected voltage, and the input The output end of the voltage divider module is connected to the input end of the input filter module, the output end of the input filter module is connected to the input end of the isolation amplifier module, the output end of the isolation amplifier module is connected to the input end of the voltage conditioning module, and the output end of the voltage conditioning module is connected to the output The input end of the filter module, the output end of the output filter module is connected to the processor of the digital display DC me...

Embodiment 3

[0049] On the basis of Embodiment 2, this embodiment further improves the isolation amplifier module, which includes an isolation operational amplifier chip U4 and an isolation power supply.

[0050] Such as figure 2 with image 3 As shown, the isolated operational amplifier chip U4 adopts AMC1300 precision isolation amplifier; the isolated operational amplifier chip U4 has two input terminals INP and INN, a power supply terminal VDD1, a ground terminal GND1 and two output terminals OUTP and OUTN, and its two input terminals Terminals INP and INN are used as two input terminals of the isolation amplifier module, and the two input terminals are connected to the secondary filter circuit, the input terminal INP is connected to the other end of the resistor R17, and the input terminal INN is connected to the other end of the resistor R22; the isolation The output terminal of the power supply is connected to the power supply terminal VDD1 of the isolated operational amplifier chi...

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Abstract

The invention relates to a digital display direct current meter, comprising a voltage sampling circuit, a current sampling current, a digital power supply module, an analog power supply module and a processor, wherein the input terminal of the voltage sampling circuit is connected with a detected voltage, and the output terminal of the voltage sampling circuit is connected with the processor; theinput terminal of the current sampling circuit is connected with a detected current, and the output terminal of the current sampling circuit is connected with the processor; and the digital power supply module and the analog power supply module are respectively connected with the processor. The digital display direct current meter provided by the invention is mainly applicable to a vehicle-mountedinstrument, by virtue of improvement of an internal circuit, safety of the whole circuit of the digital display direct current meter can be improved, and an instantaneous high voltage is prevented from damaging a rear-end circuit; meanwhile, an interference signal can be effectively filtered, and EMC and antijamming capability of the digital display direct current meter are improved; and the problems of the digital display direct current meter that a measuring range is limited, the safety is low and the EMC and antijamming capability are poor are solved.

Description

technical field [0001] The invention relates to the technology of a digital display DC meter, in particular to a digital display DC meter. Background technique [0002] A digital display DC meter is an instrument with an analog-to-digital converter and displays the value of the measured variable in digital form. Due to its visual intuition, convenient setting and high degree of intelligent control, and with the rapid development of the current sensing technology, the function of the digital display DC meter is continuously powerful and the accuracy is continuously improved. The digital display DC meter is being used in large quantities. Instead of traditional mechanical instruments, it has been widely used in all walks of life and daily life. [0003] Currently, there are few digital display DC meters on the market due to the requirements for reliability, stability and accuracy. Therefore, it is quite urgent to design and develop a digital display DC meter for real-time mo...

Claims

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Application Information

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IPC IPC(8): G01R19/25G01R15/04G01R15/20G01R15/14G01R15/16G01R15/12G01R15/08G01R1/30G01R1/36G01R1/18
CPCG01R1/18G01R1/30G01R1/36G01R15/04G01R15/08G01R15/125G01R15/14G01R15/142G01R15/16G01R15/202G01R19/2509
Inventor 吴晓斌唐小平
Owner MIANYANG WEIBO ELECTRONICS
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