CN-122001494-A - Anti-interference device, controller, control system and anti-interference method

Abstract

The invention provides an anti-interference device, a controller, a control system and an anti-interference method, which relate to the field of signal anti-interference, wherein the anti-interference device comprises a control device, a first signal line and a second signal line, wherein the control device is configured to acquire induction current on the first signal line and generate a control signal according to the induction current; and an adjusting device configured to adjust the current on the second signal line by a first current according to the control signal, the first current being equal to the induced current.

Inventors

• LI HONGBO
• SHEN WEIGANG
• Du Huiquan

Assignees

• 珠海格力电器股份有限公司

Dates

Publication Date

20260508

Application Date

20260209

Claims (17)

1. 1. An anti-tamper device comprising: a control device configured to acquire an induced current on the first signal line and generate a control signal according to the induced current, and And the adjusting device is configured to adjust the current on the second signal line to a first current according to the control signal, wherein the first current is equal to the induced current.
2. 2. The tamper resistant device of claim 1, wherein the control device is configured to: acquiring a first set current of the first signal line and a first actual current of the first signal line, and And taking the difference between the first actual current and the first set current as the induced current.
3. 3. The tamper resistant device of claim 1, wherein the control device comprises: A processing module configured to obtain the induced current and generate a first control signal according to the induced current, and A control module configured to generate a second control signal from the first control signal; The regulating means is configured to regulate the current on the second signal line to the first current in dependence of the second control signal.
4. 4. The tamper resistant device of claim 3, wherein the adjustment device comprises at least one of a first adjustment module and a second adjustment module, wherein: The first regulation module is configured to release the first current from the current on the second signal line if the induced current is greater than 0; The second regulation module is configured to compensate the current on the second signal line for the absolute value of the first current if the induced current is less than 0.
5. 5. The tamper resistant device of claim 4 wherein, The first control signal is a current signal, and the second control signal is a voltage signal.
6. 6. The tamper resistant device of claim 5 wherein, The first adjustment module includes: a first resistor, and A first triode comprising a first base configured to receive the second control signal, a first collector configured to be connected to a point on the second signal line, a first emitter configured to be connected to a first voltage terminal through the first resistor, and/or The second adjustment module includes: A second resistor, and The second triode comprises a second base electrode configured to receive the second control signal, a second collector electrode configured to be connected with a certain point on the second signal line, and a second emitter electrode configured to be connected with a second voltage end through the second resistor.
7. 7. The tamper resistant device of claim 6, wherein: the first control signal is a second current equal to the induced current; The control module comprises a third resistor and a voltage source, the voltage U2 = U3 + I2-R3 of the second control signal, U3 is the output voltage of the voltage source, I2 is the value of the second current, R3 is the resistance of the third resistor, R3 = R2 = R1, R1 is the resistance of the first resistor, and R2 is the resistance of the second resistor; Wherein, when the induced current is greater than 0, u3=ua+ut1, ua is the voltage of the first voltage terminal, ut1 is the turn-on voltage of the first triode, When the induced current is smaller than 0, u3=ub+ut2, ub is the voltage of the second voltage terminal, and Ut2 is the on voltage of the second triode.
8. 8. The tamper resistant device of claim 7 wherein the control module further comprises a first operational amplifier, a second operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor, The first operational amplifier includes: A first input configured to be grounded; a second input configured to receive the first control signal; A first output configured to be connected to a second input through the third resistor; The second operational amplifier includes: A third input configured to be grounded through the seventh resistor and to be connected to the voltage source through the sixth resistor; a fourth input configured to be connected to the first output through the fifth resistor; a second output terminal configured to be connected to the second input terminal through the fourth resistor and to output the second control signal; The fourth resistor and the fifth resistor have the same resistance, and the sixth resistor and the seventh resistor have the same resistance.
9. 9. The tamper resistant device of any one of claims 1-8, wherein, The control device is configured to generate the control signal according to the induced current when the absolute value of the induced current is equal to or greater than a threshold value.
10. 10. A controller, comprising: the anti-interference device according to any one of claims 1 to 9, and And an output device configured to output the first setting current through the first signal line and the second setting current through the second signal line.
11. 11. The controller of claim 10, wherein the output means comprises: and a main control configured to output the first setting current to a control device of the anti-interference device.
12. 12. The controller of claim 10, wherein, The first set current is equal to the second set current.
13. 13. The controller of claim 10, wherein, The distance between the first signal line and the second signal line is 1-5 cm.
14. 14. The controller according to any one of claims 10-13, wherein, The controller is configured to be connected with a frequency conversion device through the first signal line and connected with the frequency conversion device through the second signal line; the distance between the first signal line and the second signal line is less than 1/5 of the distance between the controller and the frequency conversion device.
15. 15. A control system, comprising: the controller according to any one of claims 10 to 14, and A frequency conversion device configured to be connected to the controller through a first signal line, to be connected to the controller through a second signal line, and to output an alternating current signal according to a current received via the second signal line.
16. 16. A building automation system comprising: The control system of claim 15.
17. 17. An anti-jamming method based on an anti-jamming device according to any of claims 1-9, comprising: acquiring an induced current on a first signal line and generating a control signal according to the induced current, and And according to the control signal, regulating the current on the second signal line by a first current, wherein the first current is equal to the induced current.

Description

Anti-interference device, controller, control system and anti-interference method Technical Field The disclosure relates to the field of signal anti-interference, and in particular relates to an anti-interference device, a controller, a control system and an anti-interference method. Background In a practical operating scenario, signal transmissions on signal lines between devices are susceptible to interference. For example, in the scene of building autonomous system, etc., when the controller and the frequency conversion equipment are operated cooperatively, the frequency conversion equipment adjusts the output frequency (for example, between 1kHz and 100 kHz) and the voltage amplitude through the high-frequency switching action to realize the speed regulation control of loads such as a motor, an air valve, a water valve, etc., and the high-frequency switching action can generate high-frequency electromagnetic interference due to electromagnetic conduction, and an induced current is generated on a signal line between the controller and the frequency conversion equipment through a conduction or radiation mode. Because the analog signal on the signal line has high sensitivity to current variation, the induced current can directly cause signal amplitude deviation, thereby adversely affecting the output of the frequency conversion equipment. In the technology known by the inventor, a filtering unit consisting of a resistor, a capacitor, an inductor and other elements is arranged in a signal wire to convert interference energy caused by induced current into heat energy or reflect the heat energy back to a source end, so that the elimination of the induced current is realized. Disclosure of Invention According to a first aspect of an embodiment of the present disclosure, there is provided an anti-interference device, including a control device configured to obtain an induced current on a first signal line and generate a control signal according to the induced current, and an adjustment device configured to adjust a current on a second signal line by a first current according to the control signal, the first current being equal to the induced current. In some embodiments, the control device is configured to obtain a first set current of the first signal line and a first actual current on the first signal line, and to take a difference between the first actual current and the first set current as the induced current. In some embodiments, the control device comprises a processing module configured to acquire the induced current and generate a first control signal according to the induced current, and a control module configured to generate a second control signal according to the first control signal, and the adjusting device is configured to adjust the current on the second signal line according to the second control signal. In some embodiments, the regulating means comprises at least one of a first regulating module configured to release the first current from the second signal line if the induced current is greater than 0 and a second regulating module configured to compensate the current from the second signal line for the absolute value of the first current if the induced current is less than 0. In some embodiments, the first control signal is a current signal and the second control signal is a voltage signal. In some embodiments, the first regulation module comprises a first resistor, and a first triode comprising a first base configured to receive the second control signal, a first collector configured to be connected to a point on the second signal line, a first emitter configured to be connected to a first voltage terminal through the first resistor, and/or the second regulation module comprises a second resistor, and a second triode comprising a second base configured to receive the second control signal, a second collector configured to be connected to a point on the second signal line, and a second emitter configured to be connected to a second voltage terminal through the second resistor. In some embodiments, the control module comprises a third resistor and a voltage source, wherein the voltage U2 = U3 + I2-R3 of the second control signal, U3 is the output voltage of the voltage source, I2 is the value of the second current, R3 is the resistance of the third resistor, R3 = R1, R1 is the resistance of the first resistor, R2 is the resistance of the second resistor, wherein U3 = Ua + Ut1, ua is the voltage of the first voltage terminal when the induced current is greater than 0, ut1 is the turn-on voltage of the first triode, U3 = Ub + Ut2, ub is the voltage of the second voltage terminal when the induced current is less than 0, and Ut2 is the turn-on voltage of the second triode. In some embodiments, the control module further comprises a first operational amplifier, a second operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor, wherein the first operatio