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High-voltage digital quantity acquisition circuit and working method thereof

A technology of acquisition circuit and digital quantity, which is applied in the field of high-voltage digital quantity acquisition circuit, can solve problems such as misoperation of the subsequent stage circuit, and achieve the effect of overall power consumption reduction and stable and reliable voltage

Inactive Publication Date: 2021-04-02
SHANDONG HEYUAN INTELLIGENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the input voltage is at a critical value, it is easy to be disturbed and cause the malfunction of the subsequent stage circuit

Method used

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  • High-voltage digital quantity acquisition circuit and working method thereof
  • High-voltage digital quantity acquisition circuit and working method thereof
  • High-voltage digital quantity acquisition circuit and working method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as figure 2shown.

[0039] A high-voltage digital quantity acquisition circuit, including a voltage divider circuit connected to an input terminal and an isolation circuit, the isolation circuit outputs a digital signal to a single-chip microcomputer system, and a Schmidt circuit is arranged between the voltage divider circuit and the isolation circuit Flip-flop chip U1A.

[0040] The isolation circuit is an optocoupler U2, and the optocoupler U2 is output to the single-chip microcomputer system through a digital signal, and the output signal of the Schmitt trigger chip U1A drives the optocoupler U2 through the current limiting resistor R3; the output terminal of the optocoupler U2 is set There is a resistor R4, which is used to pull down the digital signal output to the microcontroller system.

[0041] The voltage dividing circuit includes a diode D1, a voltage stabilizing diode D2, a voltage stabilizing diode D3, a voltage dividing resistor R1, a voltage divid...

Embodiment 2

[0072] The circuit described in Example 1 combined with image 3 shown.

[0073] A filter protection circuit is also provided between the input terminal and the voltage divider circuit, including a piezoresistor RV1 and a filter capacitor C2 arranged in parallel. The advantage of this technical design is that the varistor can limit the input terminal voltage below the safe voltage when the surge phenomenon occurs. The filter capacitor can filter out the high-frequency pulse at the input terminal when the burst phenomenon occurs, so as to prevent the high-frequency signal from affecting the subsequent circuit.

Embodiment 3

[0075] protection circuit as described in Example 1 combined with Figure 4 shown.

[0076] The voltage dividing circuit includes a voltage stabilizing diode D2, a diode D1, a voltage dividing resistor R1, a voltage dividing resistor R2, a voltage stabilizing diode D3 and a filter capacitor C1;

[0077] The voltage regulator diode D2, the diode D1 and the voltage dividing resistor R1 are connected in series along the input end to the input end of the Schmitt trigger chip U1A; the voltage dividing resistor R2 is connected in parallel between the input end of the Schmitt trigger chip U1A and the ground , Zener diode D3 and filter capacitor C1.

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PUM

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Abstract

A high-voltage digital quantity acquisition circuit comprises a voltage division circuit and an isolation circuit which are connected with an input end, the isolation circuit outputs digital signals to a single-chip microcomputer system, and a Schmitt trigger chip U1A is arranged between the voltage division circuit and the isolation circuit. The technical advantage of the scheme is that the hysteresis characteristic of the Schmitt trigger is introduced so that output jump generated by voltage fluctuation can be avoided. The Schmitt trigger chip is introduced to the front end of the isolationcircuit, and the output of the Schmitt trigger chip is a determined level (0V or 5V), so that the current passing through the optocoupler is always an ideal conduction current, and the voltage input into a single-chip microcomputer system is stable and reliable.

Description

technical field [0001] The invention discloses a high-voltage digital quantity acquisition circuit and a working method thereof, belonging to the technical field of signal acquisition circuits. Background technique [0002] The digital quantity acquisition circuit is a signal conversion circuit that converts the switching signal into a TTL signal that can be recognized by systems such as single-chip microcomputers, DSPs, and FPGAs. The disadvantage of this type of circuit is that it has poor anti-interference ability and high heat loss of the circuit. [0003] In order to reduce the impact of the above-mentioned technical shortcomings on the acquisition circuit, there are various solutions in the prior art, such as: [0004] Chinese patent CN106253903B discloses a digital quantity acquisition circuit, including: a signal input terminal, a voltage divider circuit and a signal output terminal; the voltage divider circuit includes a first resistor, a first diode, a second resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 张方恒王志强杨习习刘淑华杜知蔚张亚东李强张文升刁灿王丕李鑫石会莹吴勇
Owner SHANDONG HEYUAN INTELLIGENT TECH CO LTD