Port anti-interference level circuit

Abstract

The utility model discloses a port anti-interference level circuit, which comprises a photoelectric coupler, the primary side of the photoelectric coupler is connected with a control signal end and a grounding end, the primary side of the photoelectric coupler is connected with a voltage-regulator tube to realize high / open control or ground / open control, and the secondary side of the photoelectric coupler outputs a driving signal; according to the utility model, conventional devices can be applied to improve the anti-interference capability of a discrete drive circuit port and a control signal threshold value, so that the circuit is prevented from working under interference, the circuit is prevented from being abnormal due to interference voltage peak starting in a system, and the circuit is ensured to work safely, reliably and normally when a drive control signal reaches a certain level; the method is suitable for discrete magnitude control circuit ports.

Description

TECHNICAL FIELD

[0001] The utility model relates to port circuit improves the technical field of anti -interference level circuit, specifically is a port anti -interference level circuit. BACKGROUND

[0002] With the in -depth development of aviation full electrification, on -board system control logic is various and complex, therefore the design of airborne equipment also becomes complex and various, in order to realize the various control logic, the interconnection of airborne equipment and the mutual control and state monitoring etc. UTILITY MODEL CONTENT

[0003] The utility model discloses a port anti -interference level circuit to solve the problem in the background art.

[0004] To achieve the above object, the utility model provides the following technical scheme: a port anti -interference level circuit, including photoelectric coupler, the original side of photoelectric coupler is connected with control signal end and ground end, and the photoelectric coupler is connected with control signal end and has a no.

[0005] Further, the anode position of the original side of the photoelectric coupler is connected with the first stabilivolt to realize high / open control, the output end of the first stabilivolt is connected with the control signal end, and the first stabilivolt realizes high / open control to improve the port anti -interference level.

[0006] Further, the cathode position of the original side of the photoelectric coupler is connected with the second stabilivolt to realize ground / open control, the input end of the second stabilivolt is connected with the ground end, and the second stabilivolt realizes ground / open control to improve the control signal level threshold.

[0007] The utility model discloses a beneficial effect is: the utility model has the characteristics of simple and practical circuit structure, low in cost, can apply conventional device to improve the anti -interference ability of discrete drive circuit port and control signal threshold, avoid the circuit under the interference condition work, avoid the abnormality of interference voltage peak starting circuit in system, ensure that the drive control signal reaches certain level to make the circuit safe and reliable normal work, be applicable to discrete quantity control circuit port. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 It is the circuit diagram of a use example of the utility model;

[0009] Figure 2 It is the circuit diagram of another use example of the utility model.

[0010] In the drawing: 1 control signal end, 2 first resistance, 3 first voltage stabilizing tube, 4 ground terminal, 5 photoelectric coupler, 6 second resistance, 7 second voltage stabilizing tube. DETAILED DESCRIPTION

[0011] The technical scheme in the embodiments of the utility model will be described below in a clear and complete manner in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model. EMBODIMENT

[0012] Please refer to Figure 1 It provides a technical scheme for the utility model, a port anti-interference level circuit, including photoelectric coupler 5, the primary side of photoelectric coupler 5 is connected with control signal end 1 and ground terminal 4, there is a first resistance 2 connected between photoelectric coupler 5 and control signal end 1, and the first resistance 2 can be marked as resistance R1, and the primary side of the mentioned photoelectric coupler 5 is connected with voltage stabilizing tube to realize high / open control or ground / open control;The output drive signal of the secondary side of photoelectric coupler 5, and the collector of the secondary side of photoelectric coupler 5 is connected with second resistance 6, and the second resistance 6 is marked as resistance R3, and the emitter of the secondary side of photoelectric coupler 5 is connected with ground GND;Among them, the positive pole of the primary side of photoelectric coupler 5 is connected with first voltage stabilizing tube 3 to realize high / open control, and the output end of first voltage stabilizing tube 3 is connected with control signal end 1, and first voltage stabilizing tube 3 realizes high / open control to improve the port anti-interference level, when the input is high level, the primary side of photoelectric coupler 5 works, and the secondary side is turned on to output ground signal, when the input is open circuit, the primary side of photoelectric coupler 5 is open circuit, and the secondary side is disconnected to output voltage;First voltage stabilizing tube 3 can be marked as voltage stabilizing tube D1.

[0013] The VIN CON+ is a control signal input, and the VIN CON- is a ground: under normal circumstances, when the input is a high level, the primary side of the optocoupler 5 works, and the secondary side turns on to output a ground signal; when the input is an open circuit, the primary side of the optocoupler 5 is open, and the secondary side is disconnected to output 15V; if the anti-interference ability of the port is not considered to be improved, when an abnormal interference spike level of the control signal input by the primary side occurs, the optocoupler 5 may be mis-triggered, thereby causing the circuit to work unexpectedly, and the optocoupler 5 will only be turned on when the input exceeds the voltage value of the first voltage stabilizing tube 3, thereby reducing the risk of mis-triggering caused by a spike interference. Embodiment

[0014] Please refer to Figure 2 , which provides a technical scheme, a port anti-interference level circuit, comprising an optocoupler 5, a control signal end 1 and a ground end 4 connected to the primary side of the optocoupler 5, and a voltage stabilizing tube connected to the primary side of the optocoupler 5 to realize high / open control or ground / open control; wherein the negative pole of the primary side of the optocoupler 5 is connected to a second voltage stabilizing tube 7 to realize ground / open control, the input end of the second voltage stabilizing tube 7 is connected to the ground end 4, and the second voltage stabilizing tube 7 realizes ground / open control to improve the control signal level threshold, and the second voltage stabilizing tube 7 can be marked as voltage stabilizing tube D2.

[0015] The VIN CON+ is a control signal input, and the VIN CON- is an open / high impedance: under normal circumstances, when the VIN CON- is open, even if the VIN CON+ control signal input is a high voltage, the circuit will not be turned on; however, since the VIN CON- is not an absolute open signal but a high impedance state, when the VIN CON+ control signal input is a high voltage, the optocoupler 5 may be turned on, and the circuit may work unexpectedly, at this time, the input end voltage is affected by the open / high impedance, the smaller the impedance, the smaller the level required for the optocoupler 5 to be turned on, and vice versa. Such a scenario may cause our control voltage to not meet the voltage pull-off and test requirements, and the circuit may work unexpectedly. In order to meet the requirements of the control logic of “ground / open-high impedance”, the second voltage stabilizing tube 7 can adjust the level threshold of the optocoupler 5 to be turned on, thereby avoiding the abnormal turn-on of the optocoupler 5.

[0016] It should be noted that the improved port anti-interference level circuit of the discrete quantity control circuit is isolated control by using the optocoupler 5 to control the primary side of the optocoupler 5, and then to control the secondary side of the optocoupler 5 to output different driving signals to control the subsequent circuit; such a circuit for improving the anti-interference ability of the port is simple, and in actual use, circuit parameter matching is considered, and circuit modification and improvement design are carried out according to the design idea, which can provide a reference for improving the reliability of the port driving anti-interference.

[0017] Any combination of the technical features in the above embodiments can be made, for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combination of the technical features does not exist contradictions, it should be considered as the scope of the present disclosure.

[0018] The above embodiments only express the preferred embodiments of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent; it should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which belong to the protection scope of the present application; in the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection; it can be directly connected, or indirectly connected through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements; among them, the detachable mounting mode has many kinds, for example, it can be through the cooperation of plug-in and buckle, again for example, through the bolt connection mode, etc.

[0019] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A port anti-interference level circuit, characterized in that: The device includes an optocoupler, wherein the primary side of the optocoupler is connected to a control signal terminal and a ground terminal, and a first resistor is connected between the optocoupler and the control signal terminal. A Zener diode is connected to the primary side of the optocoupler to achieve high / on control or ground / on control. The secondary side of the optocoupler outputs a drive signal, and a second resistor is connected to the collector of the secondary side of the optocoupler. The emitter of the secondary side of the optocoupler is grounded to GND.

2. The port anti-interference level circuit according to claim 1, characterized in that: The primary side of the optocoupler is connected to the positive terminal of the first Zener diode to achieve high / on control. The output terminal of the first Zener diode is connected to the control signal terminal. The high / on control of the first Zener diode is used to improve the anti-interference level of the port. When the input is high, the primary side of the optocoupler is turned on and the secondary side is turned on to output the ground signal. When the input is open, the primary side of the optocoupler is turned on and the secondary side is turned off to output voltage.

3. The port anti-interference level circuit according to claim 1, characterized in that: The primary side of the optocoupler is connected to a second Zener diode to achieve ground / on control. The input terminal of the second Zener diode is connected to the ground terminal, and the ground / on control achieved by the second Zener diode is used to improve the control signal level threshold.

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