An anti-jamming communication circuit

Abstract

The utility model discloses an anti -interference communication circuit, both ends of communication circuit are input output circuit, and the communication is connected through K line between two input output circuits, and one signal input circuit and a signal receiving circuit are arranged in input output circuit, and signal input circuit adapts with the signal receiving circuit in another input output circuit, be provided with photoelectric coupler on signal receiving circuit, and the on -off of emitting diode on photoelectric coupler is controlled by input signal on signal input circuit, and the on -off of photosensitive triode on photoelectric coupler is controlled to form output signal, and power supply circuit is still provided in input output circuit, and provides working power for signal input circuit and signal receiving circuit. The problem that the communication fails due to the power line interference when the charger works is solved.

Description

Technical Field

[0001] This application relates to a communication circuit, and more particularly to an anti-interference communication circuit. Background Technology

[0002] When charging the lead-acid batteries of ordinary household electric two-wheelers, the power lines and signal lines in the charger are combined in the same wiring harness, which causes strong interference between the power lines and signal lines during charging. This results in complex noise superimposed on the K-line used to transmit signals when the charger communicates with the outside world, often leading to communication failures. An improvement is proposed to address this issue. Utility Model Content

[0003] This utility model discloses an anti-interference communication circuit, which solves the problem of communication failure caused by power line interference when the charger is working.

[0004] An anti-interference communication circuit is disclosed, wherein the two ends of the communication circuit are input and output circuits, and the two input and output circuits are connected for communication via a K-line.

[0005] The input / output circuit includes a signal input circuit and a signal receiving circuit, and the signal input circuit is adapted to the signal receiving circuit in another input / output circuit.

[0006] The signal receiving circuit is equipped with an optocoupler, and the input signal on the signal input circuit controls the light-emitting diode on the optocoupler to turn on and off, and the output signal is formed by controlling the phototransistor on the optocoupler to turn on and off.

[0007] The input / output circuit also includes a power supply circuit to provide operating power to the signal input circuit and the signal receiving circuit.

[0008] This application sets up a signal input circuit as the signal input terminal and a signal receiving circuit as the signal output terminal. After isolating the two through an optocoupler, the power supply circuit provides a stable output to the signal output terminal, thereby avoiding interference and noise in the output signal of the signal output terminal.

[0009] Several alternative methods are provided below, but they are not intended as additional limitations on the overall solution above. They are merely further additions or optimizations. Provided there are no technical or logical contradictions, each alternative method can be combined individually with respect to the overall solution above, or multiple alternative methods can be combined with each other.

[0010] Optionally, the signal input circuit is provided with a first switching circuit for controlling the current on or off of the light-emitting diode on the optocoupler.

[0011] Optionally, the signal input circuit is further provided with a second switching circuit. The power supply circuit is connected to and drives the first switching circuit to conduct. The second switching circuit is connected between the power supply circuit and the first switching circuit, and controls the current flow from the power supply circuit to the first switching circuit in response to the input signal.

[0012] Optionally, the second switching circuit uses a PNP transistor, with its base serving as the receiving end for receiving the input signal, its emitter connected to the power supply circuit, and its collector connected to the second switching circuit.

[0013] Optionally, the first switching circuit uses an NPN transistor, with its base connected to the first switching circuit, its collector connected to the negative terminal of the light-emitting diode inside the optocoupler, and its emitter grounded.

[0014] Optionally, the positive terminal of the phototransistor in the optocoupler is connected to the power supply circuit, and the potential of the positive terminal of the phototransistor is used as the output signal.

[0015] The beneficial effects of this application are as follows:

[0016] 1. In this application, an optocoupler is set between the signal input end and the signal output end to isolate the two, so as to avoid the K-line being interfered with and causing noise to be output at the signal output end, thus achieving the effect of filtering noise;

[0017] 2. In this application, PNP transistors and NPN transistors are set as the second switching circuit and the first switching circuit in the signal input circuit, which can convert the input level of the signal input terminal so that the input signal level of the signal input circuit is consistent with the output signal level of the signal receiving circuit. Attached Figure Description

[0018] Figure 1 This is the circuit diagram for this application;

[0019] Figure 2 This is a partial circuit diagram of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] It should be noted that when a component is said to be "connected" to another component, it can be directly connected to the other component or it can be connected to a component in between. When a component is said to be "set on" another component, it can be directly set on the other component or it may be set to a component in between.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] refer to Figure 1 In one embodiment of this application, an anti-interference communication circuit is disclosed for bidirectional signal transmission, including an input / output circuit for inputting and receiving communication signals, wherein the input / output circuit is provided at two locations and is respectively located at both ends of the K-line.

[0024] The input / output circuit described above includes a signal input circuit and a signal receiving circuit. The signal input circuit serves as the signal input terminal, and the signal receiving circuit serves as the signal output terminal.

[0025] The signal input circuit is adapted to the signal receiving circuit within the input / output circuit at the other end. An optocoupler is installed between the signal input circuit and the adapted signal receiving circuit to isolate current fluctuations from interference with the output signal on the signal receiving circuit.

[0026] Furthermore, the signal input circuit is connected to the light-emitting diode on the optocoupler to control the optocoupler to conduct; the signal receiving circuit is connected to the phototransistor on the optocoupler to obtain the output signal based on the conduction and disconnection of the phototransistor.

[0027] Furthermore, to mitigate the interference of current fluctuations on the output signal, the aforementioned optocoupler is located on the side of the K-line closer to the signal receiving circuit. The input signal sequentially passes through the signal input circuit, the K-line, and the optocoupler, finally being converted into an output signal by the signal receiving circuit. When the charger is operating, interference from the power line to the K-line is filtered out by the optocoupler before being output.

[0028] As mentioned above, the input / output circuit also includes a power supply circuit, which provides operating power to the signal input circuit and the signal receiving circuit.

[0029] Specifically, the power supply circuit is connected to the positive terminal of the LED and phototransistor on the optocoupler to provide power. The signal input circuit is connected to the negative terminal of the LED and is used to control the on / off state of the circuit containing the LED.

[0030] For ease of understanding, combined with Figure 2 The working principle of this application will be explained. Figure 2 To simplify the communication circuit for unidirectional transmission, the upper part is the signal input circuit and the lower part is the signal receiving circuit.

[0031] Among them, TXD1 is the signal input terminal, RXD2 is the signal output terminal adapted to TXD1, power supply circuit V1 provides operating current for the signal input circuit, and power supply circuit V2 provides operating current for the signal receiving circuit.

[0032] When the input level of TXD1 is high, transistor Q3 is cut off, which in turn causes transistor Q1 to be cut off. The current in the circuit containing the light-emitting diode in optocoupler U2 is 0, and the phototransistor in optocoupler U2 is cut off. At this time, RXD2 is at a high potential, and the output signal is high.

[0033] When the input level of TXD1 is low, transistor Q3 is turned on, transistor Q1 is turned on, the current in the circuit containing the light-emitting diode in optocoupler U2 is not zero, and the phototransistor in optocoupler U2 is turned on. At this time, RXD2 is at a low potential, and the output signal is low.

[0034] It should be noted that the transistor Q1 mentioned above serves as the first switching circuit, connected to the circuit containing the light-emitting diode, and conducts when the base input is high.

[0035] The aforementioned transistor Q3 serves as the second switching circuit, connected to the base of transistor Q1 to control the on / off state of transistor Q1. The base of transistor Q3 serves as the signal input terminal, conducting when the input signal is low.

[0036] The power supply circuit V1 provides input current to transistor Q3. Through the cooperation of transistor Q3 and transistor Q1, the input signal on TXD1 is consistent with the output signal on RXD2.

[0037] The technical features of the embodiments described above can be combined arbitrarily. 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 these technical features does not contradict each other, it should be considered to be within the scope of this specification. When technical features of different embodiments are embodied in the same drawing, it can be regarded as the drawing also disclosing examples of combinations of the various embodiments involved.

[0038] The embodiments described above are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. An anti-interference communication circuit, wherein the two ends of the communication circuit are input and output circuits, and the two input and output circuits are connected for communication via a K-line, characterized in that, The input / output circuit includes a signal input circuit and a signal receiving circuit, and the signal input circuit is adapted to the signal receiving circuit in another input / output circuit. The signal receiving circuit is equipped with an optocoupler, and the input signal on the signal input circuit controls the light-emitting diode on the optocoupler to turn on and off, and the output signal is formed by controlling the phototransistor on the optocoupler to turn on and off. The input / output circuit also includes a power supply circuit to provide operating power to the signal input circuit and the signal receiving circuit.

2. The anti-interference communication circuit according to claim 1, characterized in that, The signal input circuit is provided with a first switching circuit, which is used to control the current on or off of the light-emitting diode on the optocoupler.

3. The anti-interference communication circuit according to claim 2, characterized in that, The signal input circuit is further provided with a second switching circuit. The power supply circuit is connected to and drives the first switching circuit to conduct. The second switching circuit is connected between the power supply circuit and the first switching circuit, and controls the current flow from the power supply circuit to the first switching circuit in response to the input signal.

4. The anti-interference communication circuit according to claim 3, characterized in that, The second switching circuit uses a PNP transistor, with its base serving as the receiving end for receiving input signals, its emitter connected to the power supply circuit, and its collector connected to the second switching circuit.

5. The anti-interference communication circuit according to claim 4, characterized in that, The first switching circuit uses an NPN transistor, with its base connected to the first switching circuit, its collector connected to the negative terminal of the light-emitting diode inside the optocoupler, and its emitter grounded.

6. The anti-interference communication circuit according to claim 5, characterized in that, The positive terminal of the phototransistor inside the optocoupler is connected to the power supply circuit, and the potential of the positive terminal of the phototransistor is used as the output signal.

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