An anti-interference circuit of a three-station controller

Abstract

The application relates to the technical field of high-voltage switch cabinets, in particular to an anti-interference circuit of a three-position controller. The anti-interference circuit comprises a signal input end, a power supply circuit, a starting circuit and a control circuit, the output end of the power supply circuit is connected with a single-chip microcomputer, the starting circuit is used for judging whether the signal input by the signal input end is an operation signal in advance, so as to wake up the single-chip microcomputer and simultaneously start the power supply circuit to supply power to the single-chip microcomputer; the single-chip microcomputer after being woken up processes and judges whether the signal input by the signal input end is an operation signal, so as to control whether the control circuit cuts off the power supply circuit. The application has the effect of improving the stability of the work of the three-position controller.

Description

Technical Field

[0001] This application relates to the field of high voltage switchgear technology, and in particular to an anti-interference circuit for a three-position controller. Background Technology

[0002] Three-position controllers are an important component in high-voltage switchgear. Since most of these products operate in harsh electromagnetic environments, and similar three-position control products are usually in a standby state after installation in the switchgear, they are prone to non-human-caused malfunctions when subjected to electromagnetic interference. Summary of the Invention

[0003] To improve the stability of the three-station controller and reduce non-human error, this application provides an anti-interference circuit for the three-station controller.

[0004] The anti-interference circuit of a three-station controller provided in this application adopts the following technical solution: an anti-interference circuit of a three-station controller includes a signal input terminal, a power supply circuit, a startup circuit and a control circuit. The output terminal of the power supply circuit is connected to the microcontroller. The startup circuit is used to pre-determine whether the signal input by the signal input terminal is an operation signal, so as to wake up the microcontroller and simultaneously start the power supply circuit to supply power to the microcontroller.

[0005] After being woken up, the microcontroller processes and determines whether the signal input at the signal input terminal is an operation signal, so as to control whether the control circuit cuts off the power supply circuit.

[0006] By adopting the above technical solution, when a signal is input at the signal input terminal, the startup circuit first determines whether the input signal is an operation signal. If it is an operation signal, the startup circuit enables the power supply circuit to supply power to the microcontroller and simultaneously wakes up the microcontroller in sleep mode. At this time, the signal is input to the microcontroller, and the microcontroller further determines whether the signal is an operation signal. If it is an operation signal, the microcontroller outputs a response control signal. If it is not an operation signal, it outputs a control signal to the control circuit, thereby causing the power supply circuit to cut off the power supply to the microcontroller. This improves the stability of the microcontroller under severe electromagnetic interference and avoids non-human-caused misoperation.

[0007] Preferably, the power supply circuit includes a transformer T, a voltage regulator chip U1, an optocoupler U2, a feedback circuit, a first capacitor C1, a second capacitor C2, a first diode D1, and a first resistor R1. One end of the primary coil of the transformer T is connected to the power supply terminal, and the other end is connected to the voltage regulator chip U1. One end of the secondary coil of the transformer T is connected to the anode of the first diode D1, the cathode of the first diode D1 is connected to the anode of the first capacitor C1, and the cathode of the first capacitor C1 is grounded. The second capacitor C2 is connected in parallel with the first capacitor C1. One end of the first resistor R1 is connected to the anodes of the first capacitor C1 and the second capacitor C2, and the other end of the first resistor R1 is connected to the anode of the optocoupler U2. The cathode of the optocoupler U2 is connected to the feedback circuit, the collector of the optocoupler U2 is connected to the voltage regulator chip U1, and the emitter of the optocoupler U2 is grounded.

[0008] By adopting the above technical solution, the power supply outputs DC power through the transformer T, the first diode D1, the first capacitor C1, and the second capacitor C2. The voltage status of the output terminal is fed back through the feedback circuit, thereby controlling the voltage regulator chip U1 through the optocoupler U2, thus improving the stability of the voltage output of the power supply circuit.

[0009] Preferably, the feedback circuit includes a second resistor R2, a third resistor R3, a fourth resistor R4, a first voltage reference chip U3, and a third capacitor C3. One end of the second resistor R2 is connected to the cathode of the first diode D1, and the other end is connected to the third resistor R3, the other end of which is grounded. One end of the fourth resistor R4 is connected to the cathode of the first diode D1, and the other end is connected to the cathode of the first voltage reference chip U3. The cathode of the optocoupler U2 is connected between the fourth resistor R4 and the cathode of the first voltage reference chip U3. The anode of the first voltage reference chip U3 is grounded, and the reference terminal of the first voltage reference chip U3 is connected to one end of the third capacitor C3, the other end of which is connected between the second resistor R2 and the third resistor R3.

[0010] By adopting the above technical solution, the voltage at the power output terminal is detected by the second resistor R2 and the third resistor R3. When the voltage of the power circuit increases, the voltage conduction threshold of the reference terminal of the first voltage reference chip U3 is lower than the voltage between the second resistor R2 and the third resistor R3. The first voltage reference chip U3 is turned on, thereby turning on the optocoupler U2 and the voltage regulator chip U1 to work and stabilize the voltage output of the power circuit.

[0011] Preferably, the starting circuit includes a relay KM, a second diode D2, a fifth resistor R5, a sixth resistor R6, a first Zener diode DZ1, and a continuity detection circuit. The signal input terminal is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to one end of the first contact switch KM-1 of the relay, the other end of the first contact switch KM-1 of the relay is connected to the fifth resistor R5, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is a voltage output terminal. The cathode of the first Zener diode DZ1 is connected between the fifth resistor R5 and the sixth resistor R6, and the anode of the first Zener diode DZ1 is grounded. The voltage output terminal simultaneously supplies power to the relay and the continuity detection circuit. The control terminal of the continuity detection circuit is connected to the relay. The second contact switch KM-2 of the relay is connected between the power supply terminal and the first primary coil of the transformer T.

[0012] By adopting the above technical solution, when there is an active signal input at the signal input terminal, the first Zener diode DZ1 in the startup circuit stabilizes the level signal at the signal input terminal, thereby enabling the voltage at the voltage output terminal to drive the relay KM to work. At the same time, the signal input terminal signal is initially determined to be an operation signal by the judgment continuity circuit, thereby making the relay circuit conduct, thereby making the second contact switch KM-2 of the relay close, thereby making the power supply circuit conduct, and thus supplying power to the microcontroller.

[0013] Preferably, the conduction determination circuit includes a first Zener diode DZ1, a seventh resistor R7, an eighth resistor R8, and a second voltage reference chip U4. The cathode of the first Zener diode DZ1 is connected to the voltage output terminal, the anode of the first Zener diode DZ1 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is grounded. The anode of the second voltage reference chip U4 is connected to the coil of the relay KM, the cathode of the second voltage reference chip U4 is grounded, and the reference terminal of the second voltage reference chip U4 is connected between the seventh resistor R7 and the eighth resistor R8.

[0014] By adopting the above technical solution, when the signal input terminal is a stable level signal, the voltage value output by the voltage output terminal is sampled and detected by the seventh resistor R7 and the eighth resistor R8, and then input to the reference terminal of the second voltage reference chip U4. When the conduction threshold of the reference terminal of the second voltage reference chip U4 is lower than the voltage value before the seventh resistor R7 and the eighth resistor R8, the second voltage reference chip U2 is turned on, thereby turning on the relay KM circuit.

[0015] Preferably, it further includes a fourth diode D4, the anode of the first Zener diode DZ1 is connected to one end of the second primary coil of the transformer T, the other end of the second primary coil of the transformer T is connected to the positive terminal of the fourth diode D4, the negative terminal of the fourth diode D4 is the voltage output terminal, and the negative terminal of the fourth diode D4 is connected to both the relay KM and the negative terminal of the first Zener diode DZ1.

[0016] By adopting the above technical solution, when a stable active signal is input to the signal input terminal, power is supplied to the relay, thereby causing the first contact switch KM-1 of the relay to open. At this time, power is supplied to the relay KM through the transformer T. However, since the positive direction of the power supply at both ends of the transformer T changes, the continuity of the voltage output terminal can be ensured through the first Zener diode ZD1 and the fourth diode D4.

[0017] Preferably, it also includes a fourth capacitor C4, one end of which is connected to the negative terminal of the first Zener diode DZ1, and the other end is grounded.

[0018] By adopting the above technical solution, since the input signal voltage is alternating current, it is filtered by the fourth capacitor C4, thereby stabilizing the voltage.

[0019] Preferably, it also includes a fifth capacitor C5, one end of which is connected to the reference terminal of the second voltage reference chip U4, and the other end is grounded.

[0020] By adopting the above technical solution, filtering is performed through the fifth capacitor C5, thereby avoiding sudden spikes in the signal that could interfere with the second voltage reference chip U4 and lead to misjudgment.

[0021] Preferably, the control circuit includes a transistor Q, a ninth resistor R9, and a tenth resistor R10. The collector of the transistor Q is connected between the fourth resistor R4 and the negative terminal of the optocoupler U2. The emitter of the transistor Q is grounded. The base of the transistor Q is connected to one end of the ninth resistor R9. The other end of the ninth resistor R9 is connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is connected to the control terminal of the microcontroller.

[0022] By adopting the above technical solution, when the microcontroller is in standby mode and there is no operation signal input for a certain period of time, the microcontroller outputs a microcontroller signal, which turns on the transistor Q, thereby turning on the optocoupler U2, stopping the voltage regulator chip U1 from working, and thus cutting off the power supply circuit to the microcontroller.

[0023] Preferably, it also includes a sixth capacitor C6, one end of which is connected between the ninth resistor R9 and the tenth resistor R10, and the other end is grounded.

[0024] By adopting the above technical solution, the signal output by the microcontroller is filtered by the sixth capacitor C6 placed between the ninth resistor R9 and the tenth resistor R10.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] When a signal is input to the signal input terminal, the startup circuit first determines whether the input signal is an operation signal. If it is an operation signal, the startup circuit enables the power supply circuit to supply power to the microcontroller and simultaneously wakes up the microcontroller from sleep mode. At this time, information is input to the microcontroller, and the microcontroller further determines whether the signal is an operation signal. If it is an operation signal, the microcontroller outputs a response control signal. If it is not an operation signal, it outputs a control signal to the control circuit, thereby causing the power supply circuit to cut off the power supply to the microcontroller. This improves the stability of the microcontroller under severe electromagnetic interference and avoids non-human-caused malfunctions. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the anti-interference circuit in the embodiments of this application.

[0028] Figure 2 This is a circuit diagram of the anti-interference circuit in an embodiment of this application.

[0029] Explanation of reference numerals in the attached diagram: 1. Signal input terminal; 2. Start-up circuit; 21. Detection circuit for continuity; 3. Power supply circuit; 31. Feedback circuit; 4. Control circuit; 5. Microcontroller. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0031] This application discloses an anti-interference circuit for a three-station controller. (Refer to...) Figure 1The anti-interference circuit of the three-station controller includes a signal input terminal 1, a startup circuit 2, a power supply circuit 3, and a control circuit 4. Signal input terminal 1 is connected to startup circuit 2. Startup circuit 2 is connected to power supply circuit 3, and the power supply terminal of power supply circuit 3 is connected to microcontroller 5. Startup circuit 2 determines whether the signal input from signal input terminal 1 is an operation signal, thereby waking up microcontroller 5 and simultaneously starting power supply circuit 3 to power microcontroller 5. The control terminal of microcontroller 5 is connected to control circuit 4. Control circuit 4 is used to control power supply circuit 3 to cut off power to microcontroller 5 based on control signals from microcontroller 5. The signals input from signal input terminal 1 include active and passive signals. Active signals include voltage levels in the range of 24–220V. Startup circuit 2 determines whether the stable input active signal is an operation signal, thereby waking up microcontroller 5 from sleep mode and simultaneously controlling power supply circuit 3 to power microcontroller 5. Passive signals are directly input to microcontroller 5. The program in microcontroller 5 determines whether it is an operation signal, and then outputs a control signal to control circuit 4 to control the power cut-off circuit 3. This improves the stability of microcontroller 5 under severe electromagnetic interference and avoids non-human-caused malfunctions.

[0032] Reference Figure 2 Specifically, the power supply circuit 3 includes a transformer T, a voltage regulator chip U1, an optocoupler U2, a feedback circuit 31, a first capacitor C1, a second capacitor C2, a first diode D1, and a first resistor R1. One end of the primary coil of the transformer T is connected to the power supply terminal, and the other end is connected to the third pin of the voltage regulator chip U1. One end of the secondary coil of the transformer T is connected to the positive terminal of the first diode D1. The first capacitor C1 and the second capacitor C2 are electrolytic capacitors. The negative terminal of the first diode D1 is connected to the positive terminal of the first capacitor C1, and the negative terminal of the first capacitor C1 is grounded. The second capacitor C2 is connected in parallel with the first capacitor C1. One end of the first resistor R1 is connected to the positive terminals of the first capacitor C1 and the second capacitor C2, and the other end of the first resistor R1 is connected to the positive terminal of the optocoupler U2. The negative terminal of the optocoupler U2 is connected to the feedback circuit 31. The collector of the optocoupler U2 is connected to the voltage regulator chip U1, and the emitter of the optocoupler U2 is grounded. The power supply outputs DC power through transformer T, first diode D1, first capacitor C1, and second capacitor C2. Feedback circuit 31 detects the voltage at the output of power supply circuit 3, thereby controlling the on / off state of optocoupler U2, and then sending a signal to voltage regulator chip U1 to adjust the voltage of power supply circuit 3, thereby stabilizing the voltage output of power supply circuit 3.

[0033] The feedback circuit 31 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a first voltage reference chip U3, and a third capacitor C3. One end of the second resistor R2 is connected to the cathode of the first diode D1, and the other end is connected to the third resistor R3, with the other end of the third resistor R3 grounded. One end of the fourth resistor R4 is connected to the cathode of the first diode D1, and the other end is connected to the cathode of the first voltage reference chip U3. The cathode of the optocoupler U2 is connected between the fourth resistor R4 and the cathode of the first voltage reference chip U3. The anode of the first voltage reference chip U3 is grounded, and the reference terminal of the first voltage reference chip U3 is connected to one end of the third capacitor C3, with the other end of the third capacitor C3 connected between the second resistor R2 and the third resistor R3. The voltage at the output of the power supply circuit 3 is detected by the second resistor R2 and the third resistor R3. When the voltage of the power supply circuit 3 increases, and the voltage conduction threshold of the reference terminal of the first voltage reference chip U3 is lower than the voltage between the second resistor R2 and the third resistor R3, the first voltage reference chip U3 conducts, thereby turning on the optocoupler U2. The voltage regulator chip U1 then works to regulate the voltage of the power supply circuit 3, thereby improving the stability of the voltage output of the power supply circuit 3.

[0034] The starting circuit 2 includes a relay KM, a second diode D2, a fifth resistor R5, a sixth resistor R6, a first Zener diode DZ1, and a continuity detection circuit 21. Signal input terminal 1 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to one end of the first contact switch KM-1 of the relay. The other end of the first contact switch KM-1 is connected to the fifth resistor R5, and the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is the voltage output terminal. The cathode of the first Zener diode DZ1 is connected between the fifth resistor R5 and the sixth resistor R6, and the anode of the first Zener diode DZ1 is grounded. The voltage output terminal simultaneously supplies power to the relay and the continuity detection circuit 21. The control terminal of the continuity detection circuit 21 is connected to the relay. The second contact switch KM-2 of the relay is connected between the power supply terminal and the first primary coil of the transformer T. When an active signal is input to signal input terminal 1, the voltage level of signal input terminal 1 is stabilized by the first Zener diode DZ1 in the start-up circuit 2, so that the voltage at the voltage output terminal can drive the relay KM to work. At the same time, the signal input terminal 1 is initially determined to be an operation signal by the judgment circuit 21, so that the relay circuit is turned on, thereby closing the second contact switch KM-2 of the relay, thus turning on the power supply circuit 3, thereby supplying power to the microcontroller 5.

[0035] The conduction detection circuit 21 includes a first Zener diode DZ1, a seventh resistor R7, an eighth resistor R8, and a second voltage reference chip U4. The cathode of the first Zener diode DZ1 is connected to the voltage output terminal, and the anode of the first Zener diode DZ1 is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is grounded. The anode of the second voltage reference chip U4 is connected to the coil of the relay KM, and the cathode of the second voltage reference chip U4 is grounded. The reference terminal of the second voltage reference chip U4 is connected between the seventh resistor R7 and the eighth resistor R8. When the signal input terminal 1 is a stable level signal, the voltage value output from the voltage output terminal is sampled and detected by the seventh resistor R7 and the eighth resistor R8, and then input to the reference terminal of the second voltage reference chip U4. When the conduction threshold of the reference terminal of the second voltage reference chip U4 is lower than the voltage value between the seventh resistor R7 and the eighth resistor R8, the second voltage reference chip U4 conducts, thereby turning on the relay KM circuit.

[0036] The starting circuit 2 also includes a fourth diode D4. The anode of the first Zener diode DZ1 is connected to one end of the second primary coil of the transformer T, and the other end of the second primary coil of the transformer T is connected to the positive terminal of the fourth diode D4. The cathode of the fourth diode D4 is the voltage output terminal, and the cathode of the fourth diode D4 is connected to both the relay KM and the cathode of the first Zener diode DZ1. When a stable active signal is input to the signal input terminal 1, power is supplied to the relay, thereby opening the first contact switch KM-1 of the relay. At this time, power continues to be supplied to the relay KM through the transformer T. However, since the positive direction of the power supply at both ends of the transformer T changes, the continuity of the voltage output terminal can be ensured by the first Zener diode DZ1 and the fourth diode D4.

[0037] Preferably, the system also includes a fourth capacitor C4 and a fifth capacitor C5. One end of the fourth capacitor C4 is connected to the negative terminal of the first Zener diode DZ1, and the other end is grounded. One end of the fifth capacitor C5 is connected to the reference terminal of the second voltage reference chip U4, and the other end is grounded.

[0038] Since the input signal at the voltage input terminal is an alternating current voltage, it is filtered by the fourth capacitor C4 to stabilize the voltage. At the same time, it is filtered by the fifth capacitor C5 to prevent sudden spikes in the signal from interfering with the second voltage reference chip U4 and causing misjudgment.

[0039] Control circuit 4 includes transistor Q, sixth capacitor C6, ninth resistor R9, and tenth resistor R10. The collector of transistor Q is connected between fourth resistor R4 and the negative terminal of optocoupler U2. The emitter of transistor Q is grounded. The base of transistor Q is connected to one end of ninth resistor R9. The other end of ninth resistor R9 is connected to one end of tenth resistor R10. The other end of tenth resistor R10 is connected to the control terminal of microcontroller 5. One end of sixth capacitor C6 is connected between ninth resistor R9 and tenth resistor R10, and the other end is grounded. When microcontroller 5 is in standby mode and there is no operation signal input for a certain period of time, microcontroller 5 outputs a microcontroller 5 signal, which turns on transistor Q, thereby turning on optocoupler U2, stopping voltage regulator chip U1, and thus cutting off power supply to microcontroller 5 from power circuit 3.

[0040] The implementation principle of the anti-interference circuit of a three-station controller in this application embodiment is as follows: When a signal is input to the signal input terminal 1, the start circuit 2 first determines whether the input signal is an operation signal. If it is an operation signal, the start circuit 2 enables the power supply circuit 3 to supply power to the microcontroller 5, and at the same time wakes up the microcontroller 5 in the sleep state. At this time, the information is input to the microcontroller 5, and the microcontroller 5 further determines whether the signal is an operation signal. If it is an operation signal, the microcontroller 5 outputs a response control signal. If it is not an operation signal, it outputs a control signal to the control circuit 4, thereby cutting off the power supply of the power supply circuit 3 to the microcontroller 5, thereby improving the stability of the microcontroller 5 under severe electromagnetic interference and avoiding non-human-caused misoperation.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An anti-interference circuit for a three-station controller, characterized by: It includes signal input end (1), power supply circuit (3), starting circuit (2) and control circuit (4), the output end of power supply circuit (3) is connected with single-chip microcomputer (5), starting circuit (2) is used for judging whether the signal input by signal input end (1) is operation signal in advance, so as to wake up single-chip microcomputer (5), and starting power supply circuit (3) is used for power supply to single-chip microcomputer (5) simultaneously; The single-chip microcomputer (5) after waking up judges whether the signal input by signal input end (1) is operation signal, so as to control whether control circuit (4) cuts off power supply circuit (3); The power supply circuit (3) includes transformer T, voltage stabilizing chip U1, photoelectric coupler U2, feedback circuit (31), first capacitor C1, second capacitor C2, first diode D1 and first resistor R1, one end of the first primary coil of transformer T is connected to power supply end, and the other end is connected to voltage stabilizing chip U1;The one end of the secondary coil of transformer T is connected to the anode of first diode D1, the cathode of first diode D1 is connected with the anode of first capacitor C1, and the cathode of first capacitor C1 is grounded;Second capacitor C2 is connected with first capacitor C1 in parallel, one end of first resistor R1 is connected with the anode of first capacitor C1 and second capacitor C2, the other end of first resistor R1 is connected with the anode of photoelectric coupler U2, the cathode of photoelectric coupler U2 is connected with feedback circuit (31), the collector of photoelectric coupler U2 is connected with voltage stabilizing chip U1, and the emitter of photoelectric coupler U2 is grounded; The feedback circuit (31) includes second resistor R2, third resistor R3, fourth resistor R4, first voltage reference chip U3 and third capacitor C3, one end of second resistor R2 is connected with the cathode of first diode D1, and the other end is connected with third resistor R3, and the other end of third resistor R3 is grounded;One end of fourth resistor R4 is connected with the cathode of first diode D1, and the other end is connected with the cathode of first voltage reference chip U3;The cathode of photoelectric coupler U2 is connected between fourth resistor R4 and the cathode of first voltage reference chip U3;The anode of first voltage reference chip U3 is grounded, the reference end of first voltage reference chip U3 is connected with one end of third capacitor C3, and the other end of third capacitor C3 is connected between second resistor R2 and third resistor R3 The starting circuit (2) includes a relay KM, a second diode D2, a fifth resistor R5, a sixth resistor R6, a first voltage stabilizing diode DZ1, and a judgment conduction circuit (21), the signal input end (1) is connected with the positive pole of the second diode D2, the negative pole of the second diode D2 is connected with one end of the first contact switch KM-1 of the relay, the other end of the first contact switch KM-1 of the relay is connected with the fifth resistor R5, the other end of the fifth resistor R5 is connected with one end of the sixth resistor R6, the other end of the sixth resistor R6 is a voltage output end, the cathode of the first voltage stabilizing diode DZ1 is connected between the fifth resistor R5 and the sixth resistor R6, and the anode of the first voltage stabilizing diode DZ1 is grounded; the voltage output end simultaneously supplies power to the relay and the judgment conduction circuit (21), the control end of the judgment conduction circuit (21) is connected with the relay; the second contact switch KM-2 of the relay is connected between the power supply end and the first primary coil of the transformer T; The judgment conduction circuit (21) includes a second voltage stabilizing diode DZ2, a seventh resistor R7, an eighth resistor R8, and a second voltage reference chip U4, the negative pole of the second voltage stabilizing diode DZ2 is connected with the voltage output end, the positive pole of the second voltage stabilizing diode DZ2 is connected with one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected with one end of the eighth resistor R8, and the other end of the eighth resistor R8 is grounded; the anode of the second voltage reference chip U4 is connected with the coil of the relay KM, the cathode of the second voltage reference chip U4 is grounded, and the reference end of the second voltage reference chip U4 is connected between the seventh resistor R7 and the eighth resistor R8; The control circuit (4) includes a triode Q, a ninth resistor R9, and a tenth resistor R10, the collector of the triode Q is connected between the fourth resistor R4 and the negative pole of the photoelectric coupler U2, the emitter of the triode Q is grounded, one end of the ninth resistor R9 is connected with the base of the triode Q, the other end of the ninth resistor R9 is connected with one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected with the control end of the single-chip microcomputer (5).

2. The anti-jamming circuit for a three-station controller of claim 1, wherein: A fourth diode D4 is further included, the anode of the first voltage stabilizing diode DZ1 is connected with one end of the second primary coil of the transformer T, the other end of the second primary coil of the transformer T is connected with the positive pole of the fourth diode D4, the negative pole of the fourth diode D4 is a voltage output end, and the negative pole of the fourth diode D4 is simultaneously connected with the negative pole of the relay KM and the first voltage stabilizing diode DZ1.

3. The anti-jamming circuit for a three-position controller of claim 1, wherein: A fourth capacitor C4 is further included, one end of the fourth capacitor C4 is connected with the negative pole of the first voltage stabilizing diode DZ1, and the other end is grounded.

4. The anti-jamming circuit for a three-position controller of claim 1, wherein: A fifth capacitor C5 is further included, one end of the fifth capacitor C5 is connected with the reference end of the second voltage reference chip U4, and the other end is grounded.

5. The anti-jamming circuit for a three-position controller of claim 1, wherein: A sixth capacitor C6 is further included, one end of the sixth capacitor C6 being connected between the ninth resistor R9 and the tenth resistor R10, and the other end being grounded.

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