Passive and active compatible IO feedback circuit

Abstract

A passive and active compatible IO (input / output) feedback circuit belongs to the technical field of circuit design and comprises a first-stage signal input interface circuit, a second-stage passive and active signal switching circuit and a third-stage signal feedback circuit. The first-stage signal input interface circuit, the second-stage passive and active signal switching circuit and the third-stage signal feedback circuit are connected in sequence, and the first-stage signal input interface circuit is connected with the third-stage signal feedback circuit. The system can process passive signals and active signals, reduces the technical improvement cost, shortens the technical improvement time of a wind field, simplifies the management process, and is simple in application.

Description

Technical Field

[0001] This utility model belongs to the field of circuit design technology, specifically relating to an I / O feedback circuit that is compatible with both passive and active circuits. Background Technology

[0002] Currently, the feedback signals encountered in wind farm technical upgrades are divided into two types: active signals and passive signals. Different signal types cannot use the same IO feedback circuit, so high technical upgrade costs and long upgrade times are inevitable. If ready-made dual power switches are used, they still face problems such as high technical upgrade difficulty, complex management and application due to the variety of products, and high costs.

[0003] The prior art CN219372631U discloses a dimming control circuit compatible with both active and passive PWM signals. Although the circuit can be compatible with both active and passive PWM dimming signal outputs, it does not solve the problem of using different IO boards for different types of input signals. Utility Model Content

[0004] To address the shortcomings of existing technologies, a compatible passive and active I / O feedback circuit is provided, comprising a first-stage signal input interface circuit, a second-stage passive and active signal switching circuit, and a third-stage signal feedback circuit. The first-stage signal input interface circuit is connected to an external signal, and the first-stage signal input interface circuit, the second-stage passive and active signal switching circuit, and the third-stage signal feedback circuit are connected in sequence. The first-stage signal input interface circuit is connected to the third-stage signal feedback circuit.

[0005] Furthermore, the second-stage passive and active signal switching circuit includes a first signal loop circuit, a signal switching circuit, and a second signal loop circuit, which are connected in sequence.

[0006] Furthermore, the third-level signal feedback circuit includes an optocoupler isolation circuit and a buffer drive circuit, which are connected in sequence, and the buffer drive circuit is connected to an external device.

[0007] Furthermore, the first-stage signal input interface circuit, the first signal loop circuit, the signal switching circuit, the second signal loop circuit, the optocoupler isolation circuit, and the buffer drive circuit are connected in sequence.

[0008] Furthermore, the first-stage signal input interface circuit, optocoupler isolation circuit, and buffer drive circuit are connected in sequence.

[0009] Furthermore, the first-stage signal input interface circuit receives various external feedback signals, each signal is equipped with two signal lines: a main signal and a loop signal. The main signal is directly sent to the third-stage signal feedback circuit, and the loop signal is sent to the second-stage signal switching circuit.

[0010] The beneficial effects of this utility model are:

[0011] This invention comprises a first-stage signal input interface circuit, a second-stage passive and active signal switching circuit, and a third-stage signal feedback circuit. The first-stage signal input interface circuit is connected to an external signal. The first-stage signal input interface circuit, the second-stage passive and active signal switching circuit, and the third-stage signal feedback circuit are connected sequentially. The first-stage signal input interface circuit is connected to the third-stage signal feedback circuit. This invention can process both passive and active signals, reducing technical upgrade costs, shortening wind farm upgrade time, simplifying management processes, and offering simple application. This invention solves the existing problem that different types of input signals require different I / O boards; the circuit of this invention allows the use of a single I / O board to process different types of signals. Moreover, this invention features flexible application, high reliability, strong driving capability, and economic practicality, while maintaining both circuit simplicity and operational stability and reliability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a passive and active I / O feedback circuit compatible with this utility model.

[0013] Figure 2 This is a schematic diagram of the signal input and signal switching circuit of this utility model;

[0014] Figure 3 This is a schematic diagram of the optocoupler isolation and drive buffer circuit of this utility model. Detailed Implementation

[0015] Example 1

[0016] A compatible passive and active I / O feedback circuit, such as Figure 1 As shown, it includes a first-stage signal input interface circuit, a second-stage passive and active signal switching circuit, and a third-stage signal feedback circuit. The first-stage signal input interface circuit is connected to an external signal. The first-stage signal input interface circuit, the second-stage passive and active signal switching circuit, and the third-stage signal feedback circuit are connected in sequence. The first-stage signal input interface circuit is connected to the third-stage signal feedback circuit.

[0017] The second-stage passive and active signal switching circuit includes a first signal loop circuit, a signal switching circuit, and a second signal loop circuit, which are connected in sequence.

[0018] The third-level signal feedback circuit includes an optocoupler isolation circuit and a buffer drive circuit, which are connected in sequence. The buffer drive circuit is connected to an external device.

[0019] The first-stage signal input interface circuit, the first signal loop circuit, the signal switching circuit, the second signal loop circuit, the optocoupler isolation circuit, and the buffer drive circuit are connected in sequence.

[0020] The first-stage signal input interface circuit, optocoupler isolation circuit, and buffer drive circuit are connected in sequence.

[0021] The first-stage signal input interface circuit receives various external feedback signals. Each signal is equipped with two signal lines: a main signal and a loop signal. The main signal is sent directly to the third-stage signal feedback circuit, and the loop signal is sent to the second-stage signal switching circuit.

[0022] The first-level signal input interface circuit is connected to an external signal, the signal loop is connected to the second-level passive and active signal switching circuit, and the main signal is connected to the third-level optocoupler isolation circuit.

[0023] The second-stage passive and active signal switching circuit is connected to the first-stage signal loop circuit and to the third-stage signal feedback circuit.

[0024] The third-level signal feedback circuit is further divided into an optocoupler isolation circuit and a buffer drive circuit. The front end of the optocoupler isolation circuit is connected to the first-level signal input interface circuit, and the rear end is connected to the buffer drive circuit. The front end of the third-level buffer drive circuit is connected to the third-level optocoupler isolation circuit, and the rear end is connected to an external device.

[0025] The passive and active signal switching circuit described above switches the signal and provides a suitable signal loop.

[0026] The signal feedback circuit described above: the signal is optically isolated, and the output signal is driven by a buffered drive circuit with a Schmitt trigger.

[0027] Example 2

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, this utility model mainly consists of three parts: a first-stage signal input interface circuit, a second-stage passive and active signal switching circuit, and a third-stage signal feedback circuit. The second-stage passive and active signal switching circuit is further divided into a signal switching circuit and a signal loop circuit; the third-stage signal feedback circuit is further divided into an optocoupler isolation circuit and a buffer drive circuit.

[0030] like Figure 2As shown, the first-stage signal input interface circuit receives various external feedback signals, each equipped with two signal lines: a main signal and a loop signal. The main signal is directly sent to the third-stage circuit, and the loop signal is sent to the second-stage switching circuit.

[0031] like Figure 2 As shown, the second-stage passive and active signal switching circuit switches signals and provides suitable signal loops. Specifically, for passive signals, its signal loop is connected to the positive terminal of the power supply; for active signals, its signal loop is connected to the negative terminal of the power supply. A 24V power supply circuit is provided for the loops; the power supply circuit's power can be flexibly designed to meet different needs. The negative terminal of the power supply serves as the loop for all signals.

[0032] like Figure 3 As shown, the signal feedback circuit employs optocoupler isolation and outputs a buffered driver circuit with a Schmitt trigger. The switched feedback signal is input to the input of a third-stage optocoupler isolation circuit composed of optocouplers, current-limiting resistors, and protection circuits. Optocoupler isolation eliminates high-frequency interference and suppresses noise. The clean feedback signal is connected to the input pin of the buffered driver chip via current-limiting resistors, pull-up resistors, and anti-interference capacitors. A driver chip with a Schmitt trigger can be selected, as such chips offer strong anti-interference capabilities and good driving performance. The signal output from the buffered driver chip is then connected to the pin of an external device.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A compatible passive and active I / O feedback circuit, characterized in that, It includes a first-stage signal input interface circuit, a second-stage passive and active signal switching circuit, and a third-stage signal feedback circuit. The first-stage signal input interface circuit is connected to an external signal. The first-stage signal input interface circuit, the second-stage passive and active signal switching circuit, and the third-stage signal feedback circuit are connected in sequence. The first-stage signal input interface circuit is connected to the third-stage signal feedback circuit.

2. The I / O feedback circuit compatible with both passive and active circuits according to claim 1, characterized in that, The second-stage passive and active signal switching circuit includes a first signal loop circuit, a signal switching circuit, and a second signal loop circuit, which are connected in sequence.

3. The I / O feedback circuit compatible with both passive and active circuits according to claim 2, characterized in that, The third-level signal feedback circuit includes an optocoupler isolation circuit and a buffer drive circuit, which are connected in sequence. The buffer drive circuit is connected to an external device.

4. The I / O feedback circuit compatible with both passive and active circuits according to claim 3, characterized in that, The first-stage signal input interface circuit, the first signal loop circuit, the signal switching circuit, the second signal loop circuit, the optocoupler isolation circuit, and the buffer drive circuit are connected in sequence.

5. The I / O feedback circuit compatible with both passive and active I / O according to claim 4, characterized in that, The first-stage signal input interface circuit, optocoupler isolation circuit, and buffer drive circuit are connected in sequence.

6. The I / O feedback circuit compatible with both passive and active I / O according to claim 5, characterized in that, The first-stage signal input interface circuit receives various external feedback signals. Each signal is equipped with two signal lines: a main signal and a loop signal. The main signal is sent directly to the third-stage signal feedback circuit, and the loop signal is sent to the second-stage signal switching circuit.

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