Alternating current on-off device and single-wire communication equipment
By designing an AC on-off device including on-off devices, PIN diodes and one-way conducting devices, the problems of high cost and slow response speed in the prior art are solved, and a low-cost and efficient AC on-off function is realized.
Patent Information
- Application Number
- CN202420711381.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-08
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-04-08
AI Technical Summary
Existing AC on-off devices are costly and slow to respond, making it difficult to meet the low-cost and efficient on-off needs.
An AC on-off device including on-off devices, PIN diodes and unidirectional conducting devices was designed to enable the conduction and disconnection of the AC path through control signals. Components such as NMOS and PMOS tubes are used to combine capacitors and diodes to construct DC and AC paths to achieve rapid response.
It realizes rapid conduction and disconnection of the AC path, reduces costs, and improves response speed and avoids signal interference.
Smart Images
Figure CN222321503U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of electronic technology, in particular to an AC on-off device and a single-line communication device. Background Art
[0002] In an AC circuit, a relay is usually used as an AC on-off device. However, the cost of using a relay is high and it is easy to cause a delay. Therefore, it is urgent to provide a new AC on-off device to reduce the cost. Utility Model Content
[0003] The utility model aims to solve one of the problems.
[0004] The main purpose of the utility model is to provide an AC on-off device
[0005] Another object of the utility model is to provide a single-line communication device.
[0006] In order to achieve the above-mentioned purpose, the technical solution of the utility model is specifically implemented as follows:
[0007] On one hand, the utility model provides an AC on-off device, comprising: a first AC input and output terminal, a second AC input and output terminal, a first capacitor, a second capacitor, a first on-off device, a second on-off device, a third on-off device, a first PIN diode, a second PIN diode, a first unidirectional conduction device, and a second unidirectional conduction device; wherein:
[0008] The first AC input and output terminal and the second AC input and output terminal are electrically connected to a common terminal respectively;
[0009] The first end of the first capacitor is electrically connected to the first AC input and output end, and the second end of the first capacitor is electrically connected to the first end of the first switching device;
[0010] The second end of the first on-off device is electrically connected to the cathode of the first PIN diode, and the control end of the first on-off device is used to turn on or off the first end of the first on-off device and the second end of the first on-off device under the control of a control signal;
[0011] The anode of the first PIN diode is electrically connected to the cathode of the second PIN diode;
[0012] The anode of the second PIN diode is electrically connected to the first end of the second capacitor;
[0013] The second end of the second capacitor is electrically connected to the second AC input and output end;
[0014] The first end of the second on-off device is electrically connected to the first power supply end, the second end of the second on-off device is electrically connected to the anode of the second PIN diode and the first end of the second capacitor, and the control end of the second on-off device is used to turn on or off the first end of the second on-off device and the second end of the second on-off device under the control of a control signal;
[0015] The positive electrode of the first unidirectional conductive device is electrically connected to the first end of the first switching device and the second end of the first capacitor; the negative electrode of the first unidirectional conductive device is electrically connected to the positive electrode of the second unidirectional conductive device;
[0016] The cathode of the second unidirectional conducting device is electrically connected to the first end of the third on-off device;
[0017] The second end of the third on-off device is electrically connected to the second end of the second capacitor and the second AC input and output end; the control end of the third on-off device is used to turn on or off the first end of the third on-off device and the second end of the third on-off device under the control of a control signal;
[0018] The control end of the first on-off device conducts the first end of the first on-off device and the second end of the first on-off device under the control of the first control signal; the control end of the second on-off device conducts the first end of the second on-off device and the second end of the second on-off device under the control of the second control signal; the control end of the third on-off device conducts the first end of the third on-off device and the second end of the third on-off device under the control of the third control signal, and the DC path is conducted, and the DC path includes: the first power supply end, the second on-off device, the second PIN diode, the first PIN diode, the first on-off device, the first unidirectional conductive device, the second unidirectional conductive device, the third on-off device and the common end connected in sequence; the AC path between the first AC input and output end and the second AC input and output end is conducted, and the AC path includes: the first AC input and output end, the first capacitor, the first on-off device, the first PIN diode, the second PIN diode, the second capacitor and the second AC input and output end connected in sequence;
[0019] Under the control of the fourth control signal, the control end of the second on-off device disconnects the first end of the second on-off device and the second end of the second on-off device, the DC path is disconnected, and the AC path between the first AC input and output end and the second AC input and output end is disconnected.
[0020] Optionally, the AC switching device further includes: a first control device, wherein:
[0021] The first end of the first control device is electrically connected to the second power supply end and the control end of the first on-off device, and the second end of the first control device is electrically connected to the first end of the first on-off device and the positive pole of the first unidirectional conductive device; the control end of the first control device is used to conduct the first end of the first control device and the second end of the first control device under the control of the first control signal, and control the first end of the first on-off device and the second end of the first on-off device to conduct.
[0022] Optionally, the AC switching device further includes: a second control device, wherein:
[0023] The first end of the second control device is electrically connected to the control end of the second on-off device and the first power supply end, and the second end of the second control device is electrically connected to the common end; the control end of the second control device is used to turn on the first end of the second control device and the second end of the second control device under the control of the second control signal, and control the first end of the second on-off device and the second end of the second on-off device to be turned on.
[0024] Optionally, the AC switching device further includes: a third control device, wherein:
[0025] The first end of the third control device is electrically connected to the second power supply end and the control end of the third on-off device, and the second end of the third control device is electrically connected to the common end; the control end of the third control device is used to conduct the first end of the third control device and the second end of the third control device under the control of the third control signal, and control the first end of the third on-off device and the second end of the third on-off device to be conductive.
[0026] Optionally, the AC switching device further includes: a shielding device, wherein:
[0027] The shielding device comprises: a third capacitor, a fourth capacitor, a third unidirectional conductive device and a fourth on-off device, wherein:
[0028] A first end of the third capacitor is electrically connected to the anode of the first PIN diode and the cathode of the second PIN diode, and a second end of the third capacitor is electrically connected to the cathode of the first unidirectional conductive device, the anode of the second unidirectional conductive device, and the first end of the fourth capacitor;
[0029] A first end of the fourth capacitor is electrically connected to the negative electrode of the first unidirectional conductive device and the positive electrode of the second unidirectional conductive device; a second end of the fourth capacitor is electrically connected to the positive electrode of the third unidirectional conductive device;
[0030] The cathode of the third unidirectional conducting device is electrically connected to the first end of the fourth on-off device;
[0031] The second end of the fourth on-off device is electrically connected to the common end;
[0032] When the AC path between the first AC input / output terminal and the second AC input / output terminal is disconnected, the control end of the fourth on-off device, under the control of the fifth control signal, turns on the first end of the fourth on-off device and the second end of the fourth on-off device, and the residual signal in the line flows into the common end through the shielding device.
[0033] Optionally, the AC switching device further includes: a fourth control device, wherein:
[0034] The first end of the fourth control device is used to receive the fifth control signal, and the second end of the fourth control device is electrically connected to the control end of the fourth on-off device and the common end; the control end of the fourth control device maintains a preset level;
[0035] Under the control of the fifth control signal, the fourth control device turns on the first end of the fourth control device and the second end of the fourth control device, and controls the first end of the fourth on-off device and the second end of the fourth on-off device to be turned on.
[0036] Optionally, the first unidirectional conducting device is a diode or a PIN diode; the second unidirectional conducting device is a diode or a PIN diode.
[0037] Optionally, the first on-off device is an NMOS tube; the second on-off device is a PMOS tube; the third on-off device is an NMOS tube;
[0038] The fourth on-off device is an NMOS tube.
[0039] Optionally, the first control device is an NMOS tube; the second control device is an NMOS tube; the third control device is an NMOS tube;
[0040] The fourth control device is an NMOS tube.
[0041] On the other hand, the utility model further provides a single-line communication device, comprising: the AC on-off device and a processor as described above, wherein: the processor is used to output a first control signal, a second control signal, a third control signal and / or a fourth control signal.
[0042] It can be seen from the technical solution provided by the above-mentioned utility model that the utility model provides an AC on-off device and a single-line communication device, which can realize the conduction and disconnection of the AC path, save costs and improve the response speed. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0044] Figure 1 A schematic diagram of the structure of an AC switching device provided in an embodiment of the utility model;
[0045] Figure 2 A schematic diagram of a circuit structure for a specific implementation of the AC switching device provided in an embodiment of the utility model. DETAILED DESCRIPTION
[0046] The following is a clear and complete description of the technical solutions in the embodiments of the utility model 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 of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.
[0047] This embodiment provides an AC switching device. Figure 1 This is a schematic diagram of the structure of an AC on-off device. Figure 1 As shown, the AC switching device includes: a first AC input and output terminal, a second AC input and output terminal, a first capacitor, a second capacitor, a first switching device, a second switching device, a third switching device, a first PIN diode, a second PIN diode, a first unidirectional conduction device, and a second unidirectional conduction device; wherein:
[0048] The first AC input and output terminal and the second AC input and output terminal are electrically connected to the common terminal respectively;
[0049] A first end of the first capacitor is electrically connected to the first AC input and output terminal, and a second end of the first capacitor is electrically connected to the first end of the first switching device;
[0050] The second end of the first on-off device is electrically connected to the cathode of the first PIN diode, and the control end of the first on-off device is used to turn on or off the first end of the first on-off device and the second end of the first on-off device under the control of the control signal;
[0051] The anode of the first PIN diode is electrically connected to the cathode of the second PIN diode;
[0052] The anode of the second PIN diode is electrically connected to the first end of the second capacitor;
[0053] The second end of the second capacitor is electrically connected to the second AC input and output end;
[0054] The first end of the second on-off device is electrically connected to the first power supply end, the second end of the second on-off device is electrically connected to the anode of the second PIN diode and the first end of the second capacitor, and the control end of the second on-off device is used to turn on or off the first end of the second on-off device and the second end of the second on-off device under the control of the control signal;
[0055] The positive electrode of the first unidirectional conductive device is electrically connected to the first end of the first switching device and the second end of the first capacitor; the negative electrode of the first unidirectional conductive device is electrically connected to the positive electrode of the second unidirectional conductive device;
[0056] The cathode of the second unidirectional conducting device is electrically connected to the first end of the third on-off device;
[0057] The second end of the third on-off device is electrically connected to the second end of the second capacitor and the second AC input and output end; the control end of the third on-off device is used to turn on or off the first end of the third on-off device and the second end of the third on-off device under the control of the control signal;
[0058] The control end of the first on-off device conducts the first end of the first on-off device and the second end of the first on-off device under the control of the first control signal; the control end of the second on-off device conducts the first end of the second on-off device and the second end of the second on-off device under the control of the second control signal; the control end of the third on-off device conducts the first end of the third on-off device and the second end of the third on-off device under the control of the third control signal, and the DC path is conducted, and the DC path includes: the first power supply end, the second on-off device, the second PIN diode, the first PIN diode, the first on-off device, the first unidirectional conductive device, the second unidirectional conductive device, the third on-off device and the common end connected in sequence; the AC path between the first AC input and output end and the second AC input and output end is conducted, and the AC path includes: the first AC input and output end, the first capacitor, the first on-off device, the first PIN diode, the second PIN diode, the second capacitor and the second AC input and output end connected in sequence;
[0059] Under the control of the fourth control signal, the control end of the second switching device disconnects the first end of the second switching device and the second end of the second switching device, thereby disconnecting the DC path and the AC path between the first AC input / output end and the second AC input / output end.
[0060] In this embodiment, if the AC on-off device needs to be turned on, when the first on-off device and the third on-off device are turned on, the second on-off device is turned on under the control of the second control signal, and based on the characteristics of the first PIN diode and the second PIN diode, the DC path is turned on, thereby making the AC path turned on, and the AC signal can be transmitted from the first AC input and output terminal to the second AC input and output terminal, and can also be transmitted from the second AC input and output terminal to the first AC input and output terminal, thereby achieving the conduction of the AC path, and the AC signal is transmitted on the AC path.
[0061] In this embodiment, if the AC on-off device needs to be disconnected, the second on-off device is disconnected under the control of the fourth control signal, and based on the characteristics of the first PIN diode and the second PIN diode, the DC path is disconnected, thereby disconnecting the AC path, and the AC signal cannot be transmitted through the AC path. The AC path is disconnected, and the AC signal cannot be transmitted on the AC path.
[0062] As an optional implementation manner in this embodiment, the AC on-off device provided in this embodiment also includes: a first control device, wherein: the first end of the first control device is electrically connected to the second power supply end and the control end of the first on-off device, and the second end of the first control device is electrically connected to the first end of the first on-off device and the positive pole of the first unidirectional conductive device; the control end of the first control device is used to conduct the first end of the first control device and the second end of the first control device under the control of a first control signal, and control the first end of the first on-off device and the second end of the first on-off device to conduct.
[0063] As an optional implementation in this embodiment, the AC on-off device provided in this embodiment also includes: a second control device, wherein: the first end of the second control device is electrically connected to the control end of the second on-off device and the first power supply end, and the second end of the second control device is electrically connected to the common end; the control end of the second control device is used to turn on the first end of the second control device and the second end of the second control device under the control of a second control signal, and control the first end of the second on-off device and the second end of the second on-off device to be turned on.
[0064] As an optional implementation scheme in this embodiment, the AC on-off device provided in this embodiment also includes: a third control device, wherein: the first end of the third control device is electrically connected to the second power supply end and the control end of the third on-off device, and the second end of the third control device is electrically connected to the common end; the control end of the third control device is used to turn on the first end of the third control device and the second end of the third control device under the control of a third control signal, and control the first end of the third on-off device and the second end of the third on-off device to be turned on.
[0065] Specifically, the first on-off device, the second on-off device and the third on-off device are respectively turned on or off under the control of their respective control devices, thereby ensuring the stability of the circuit and improving the response speed.
[0066] As an optional implementation manner in this embodiment, the AC on-off device provided in this embodiment also includes: a shielding device, wherein: the shielding device includes: a third capacitor, a fourth capacitor, a third unidirectional conductive device and a fourth on-off device, wherein: the first end of the third capacitor is electrically connected to the positive electrode of the first PIN diode and the negative electrode of the second PIN diode, and the second end of the third capacitor is electrically connected to the negative electrode of the first unidirectional conductive device, the positive electrode of the second unidirectional conductive device and the first end of the fourth capacitor; the first end of the fourth capacitor is electrically connected to the negative electrode of the first unidirectional conductive device and the positive electrode of the second unidirectional conductive device; the second end of the fourth capacitor is electrically connected to the positive electrode of the third unidirectional conductive device; the negative electrode of the third unidirectional conductive device is electrically connected to the first end of the fourth on-off device; the second end of the fourth on-off device is electrically connected to the common end; when the AC path between the first AC input and output end and the second AC input and output end is disconnected, the control end of the fourth on-off device, under the control of the fifth control signal, turns on the first end of the fourth on-off device and the second end of the fourth on-off device, and the residual signal in the line flows into the common end through the shielding device.
[0067] Specifically, after the AC path is disconnected, the residual signal generated in the line will be output through the first AC input and output terminal or the second AC input and output terminal, which will cause signal interference. Therefore, the residual signal in the line is flowed into the common terminal through the above-mentioned shielding device to eliminate signal interference.
[0068] As an optional implementation in this embodiment, the AC on-off device provided in this embodiment also includes: a fourth control device, wherein: the first end of the fourth control device is used to receive a fifth control signal, and the second end of the fourth control device is electrically connected to the control end and the common end of the fourth on-off device; the control end of the fourth control device maintains a preset level; under the control of the fifth control signal, the fourth control device turns on the first end of the fourth control device and the second end of the fourth control device, and controls the first end of the fourth on-off device and the second end of the fourth on-off device to be turned on.
[0069] Specifically, the fourth switching device is turned on or off under the control of the fourth control device, thereby ensuring the stability of the circuit and improving the response speed.
[0070] As an optional implementation in the embodiment of the utility model, the first unidirectional conducting device is a diode or a PIN diode; the second unidirectional conducting device is a diode or a PIN diode. The first on-off device is an NMOS tube; the second on-off device is a PMOS tube; the third on-off device is an NMOS tube; the fourth on-off device is an NMOS tube; the first control device is an NMOS tube; the second control device is an NMOS tube; the third control device is an NMOS tube; the fourth control device is an NMOS tube.
[0071] As an application example, Figure 2 The specific circuit structure of the AC switching device provided by the embodiment of the utility model is shown. Figure 2 As shown, in the AC on-off device provided by the embodiment of the utility model, the first power supply terminal is V1, providing a voltage of 5.8V, the first power supply terminal is V2, providing a voltage of 48V, the common terminal is GND, the first AC input and output terminal is TB-, the second AC input and output terminal is TA-, the first capacitor is C1, the second capacitor is C2, the first on-off device is NMOS tube Q1, the second on-off device is PMOS tube Q2, the third on-off device is NMOS tube Q3, the fourth on-off device is NMOS tube Q7, the first PIN diode D1, the second PIN diode D2, the first single The forward conducting device is a PIN diode D3, the second unidirectional forward conducting device is a PIN diode D4, the first control device includes an NMOS tube Q4 and its peripheral circuits, the second control device includes an NMOS tube Q5 and its peripheral circuits, the third control device includes an NMOS tube Q6 and its peripheral circuits, the fourth control device includes an NMOS tube Q8 and its peripheral circuits, the third capacitor is C3, the fourth capacitor is C4, the third unidirectional forward conducting device is a diode D5, and the AC switching device provided in the embodiment of the utility model also includes: peripheral circuits that cooperate with the above-mentioned components, such as resistors, capacitors and other devices.
[0072] As an optional implementation in the embodiment of the utility model, the AC switching device provided in this embodiment also includes: a master control device for receiving a control signal to control the switching of the first switching device and the third switching device. Specifically, the master control device includes: an NMOS tube Q9 and a PMOS tube Q10 and their peripheral circuits.
[0073] The specific working principle of the AC on-off device provided in the embodiment of the utility model is as follows:
[0074] After the control end of Q9 receives the control signal and turns on, Q10 turns on, so that after Q4 turns on, Q1 turns on, and after Q6 turns on, Q3 turns on. After the control end of Q5 receives the control signal and turns on, Q2 turns on. Based on the characteristics of the PIN diode, D1 and D2 are turned on. At this point, the DC path including V1, Q2, D2, D1, Q1, D3, D4, Q3 and GND connected in sequence is turned on, so that the AC path including TB-, C1, Q1, D1, D2, C2 and TA- connected in sequence is turned on, realizing the conduction of the AC path, and the AC signal is transmitted on the AC path.
[0075] After the control end of Q5 receives the control signal and disconnects, Q2 is disconnected. Based on the characteristics of the PIN diode, D1 and D2 are disconnected. At this point, the DC path including V1, Q2, D2, D1, Q1, D3, D4, Q3 and GND connected in sequence is disconnected, thereby disconnecting the AC path including TB-, C1, Q1, D1, D2, C2 and TA- connected in sequence, realizing the disconnection of the AC path, and the AC signal cannot be transmitted on the AC path.
[0076] The present utility model also provides a single-line communication device, including: the above-mentioned AC on-off device and a processor, wherein:
[0077] The processor is used to output a first control signal, a second control signal, a third control signal and / or a fourth control signal. Specifically, in this embodiment, a single line refers to data transmission via a line. A line includes: a single bus such as RS485, a power line or an optical fiber.
[0078] It can be seen that the AC on / off device and the single-line communication device provided by the embodiment of the utility model can realize the conduction and disconnection of the AC path, saving costs while improving the response speed.
[0079] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. An AC switching device, characterized in that: include: A first AC input and output terminal, a second AC input and output terminal, a first capacitor, a second capacitor, a first on-off device, a second on-off device, a third on-off device, a first PIN diode, a second PIN diode, a first unidirectional conductive device, and a second unidirectional conductive device; wherein: The first AC input and output terminal and the second AC input and output terminal are electrically connected to a common terminal respectively; The first end of the first capacitor is electrically connected to the first AC input and output end, and the second end of the first capacitor is electrically connected to the first end of the first switching device; The second end of the first on-off device is electrically connected to the cathode of the first PIN diode, and the control end of the first on-off device is used to turn on or off the first end of the first on-off device and the second end of the first on-off device under the control of a control signal; The anode of the first PIN diode is electrically connected to the cathode of the second PIN diode; The anode of the second PIN diode is electrically connected to the first end of the second capacitor; The second end of the second capacitor is electrically connected to the second AC input and output end; The first end of the second on-off device is electrically connected to the first power supply end, the second end of the second on-off device is electrically connected to the anode of the second PIN diode and the first end of the second capacitor, and the control end of the second on-off device is used to turn on or off the first end of the second on-off device and the second end of the second on-off device under the control of a control signal; The positive electrode of the first unidirectional conductive device is electrically connected to the first end of the first switching device and the second end of the first capacitor; the negative electrode of the first unidirectional conductive device is electrically connected to the positive electrode of the second unidirectional conductive device; The cathode of the second unidirectional conducting device is electrically connected to the first end of the third on-off device; The second end of the third on-off device is electrically connected to the second end of the second capacitor and the second AC input and output end; the control end of the third on-off device is used to turn on or off the first end of the third on-off device and the second end of the third on-off device under the control of a control signal; The control end of the first on-off device conducts the first end of the first on-off device and the second end of the first on-off device under the control of the first control signal; the control end of the second on-off device conducts the first end of the second on-off device and the second end of the second on-off device under the control of the second control signal; the control end of the third on-off device conducts the first end of the third on-off device and the second end of the third on-off device under the control of the third control signal, and the DC path is conducted, and the DC path includes: the first power supply end, the second on-off device, the second PIN diode, the first PIN diode, the first on-off device, the first unidirectional conductive device, the second unidirectional conductive device, the third on-off device and the common end connected in sequence; the AC path between the first AC input and output end and the second AC input and output end is conducted, and the AC path includes: the first AC input and output end, the first capacitor, the first on-off device, the first PIN diode, the second PIN diode, the second capacitor and the second AC input and output end connected in sequence; Under the control of the fourth control signal, the control end of the second on-off device disconnects the first end of the second on-off device and the second end of the second on-off device, the DC path is disconnected, and the AC path between the first AC input and output end and the second AC input and output end is disconnected.
2. The device according to claim 1, characterized in that Also includes: A first control device, wherein: The first end of the first control device is electrically connected to the second power supply end and the control end of the first on-off device, and the second end of the first control device is electrically connected to the first end of the first on-off device and the positive pole of the first unidirectional conductive device; the control end of the first control device is used to conduct the first end of the first control device and the second end of the first control device under the control of the first control signal, and control the first end of the first on-off device and the second end of the first on-off device to conduct.
3. The device according to claim 1, characterized in that Also includes: A second control device, wherein: The first end of the second control device is electrically connected to the control end of the second on-off device and the first power supply end, and the second end of the second control device is electrically connected to the common end; the control end of the second control device is used to turn on the first end of the second control device and the second end of the second control device under the control of the second control signal, and control the first end of the second on-off device and the second end of the second on-off device to be turned on.
4. The device according to claim 1, characterized in that Also includes: A third control device, wherein: The first end of the third control device is electrically connected to the second power supply end and the control end of the third on-off device, and the second end of the third control device is electrically connected to the common end; the control end of the third control device is used to conduct the first end of the third control device and the second end of the third control device under the control of the third control signal, and control the first end of the third on-off device and the second end of the third on-off device to be conductive.
5. The device according to any one of claims 1 to 4, characterized in that: Also includes: Shielding devices, wherein: The shielding device comprises: a third capacitor, a fourth capacitor, a third unidirectional conductive device and a fourth on-off device, wherein: A first end of the third capacitor is electrically connected to the anode of the first PIN diode and the cathode of the second PIN diode, and a second end of the third capacitor is electrically connected to the cathode of the first unidirectional conductive device, the anode of the second unidirectional conductive device, and the first end of the fourth capacitor; A first end of the fourth capacitor is electrically connected to the negative electrode of the first unidirectional conductive device and the positive electrode of the second unidirectional conductive device; a second end of the fourth capacitor is electrically connected to the positive electrode of the third unidirectional conductive device; The cathode of the third unidirectional conductive device is electrically connected to the first end of the fourth on-off device; The second end of the fourth on-off device is electrically connected to the common end; When the AC path between the first AC input / output terminal and the second AC input / output terminal is disconnected, the control end of the fourth on-off device, under the control of the fifth control signal, turns on the first end of the fourth on-off device and the second end of the fourth on-off device, and the residual signal in the line flows into the common end through the shielding device.
6. The device according to claim 5, characterized in that Also includes: A fourth control device, wherein: The first end of the fourth control device is used to receive the fifth control signal, and the second end of the fourth control device is electrically connected to the control end of the fourth on-off device and the common end; the control end of the fourth control device maintains a preset level; Under the control of the fifth control signal, the fourth control device turns on the first end of the fourth control device and the second end of the fourth control device, and controls the first end of the fourth on-off device and the second end of the fourth on-off device to be turned on.
7. The device according to claim 1, characterized in that The first unidirectional conducting device is a diode or a PIN diode; the second unidirectional conducting device is a diode or a PIN diode.
8. The device according to claim 5, characterized in that The first on-off device is an NMOS tube; The second on-off device is a PMOS tube; The third on-off device is an NMOS tube; The fourth on-off device is an NMOS tube.
9. The device according to claim 2, characterized in that The first control device is an NMOS tube.
10. The device according to claim 3, characterized in that The second control device is an NMOS tube.
11. The device according to claim 4, characterized in that The third control device is an NMOS tube.
12. The device according to claim 6, characterized in that The fourth control device is an NMOS tube.
13. A single-line communication device, characterized in that: include: The AC switching device and processor according to any one of claims 1 to 12, wherein: The processor is used to output a first control signal, a second control signal, a third control signal and / or a fourth control signal.