Signal conversion circuit

Abstract

The present invention provides a signal conversion circuit that can provide signal conversion between devices of these different manufacturers without changing the original hardware and software design. Specifically, the present invention uses some common relays and / or time delay relays to build a signal conversion circuit that converts a level signal (first standard signal) into a pulse signal (second standard signal) and a signal conversion circuit that converts a pulse signal (second standard signal) into a level signal (first standard signal). The signal conversion circuit of the present invention realizes the conversion between a level signal and a pulse signal through a combination of relays. The circuit design is simple, easy to implement, highly reliable, and has a fast circuit response speed. It does not involve software control, which saves software development work and avoids the risks brought by software vulnerabilities. It is especially convenient for on-site implementation and application.

Description

Technical Field

[0001] The present invention relates to a circuit, in particular to a conversion circuit between two signals of different standards. Background Art

[0002] The operation or operation of electrical equipment is generally controlled by a control signal. Usually, control circuits provided by different manufacturers will generate control signals of different formats. For example, the control signal of a control circuit provided by one manufacturer is a pulse signal, in which one pulse is used to start an operation of the electrical equipment, and another pulse is used to stop the operation of the electrical equipment, and the operation or operation state of the electrical equipment is maintained between the two pulses. However, the control signal of a control circuit provided by another manufacturer is a level signal, in which the leading edge jump of the level signal is used to start an operation of the electrical equipment, and the trailing edge jump of the level signal is used to stop the operation of the electrical equipment, and the operation or operation state of the electrical equipment is maintained between the two jumps.

[0003] The inventor has found through long-term observation that when an electrical device uses an interface circuit of a manufacturer to control the electrical device, a control signal of a certain standard (such as a pulse signal) may be used to control the operation or operation of the electrical device. In some cases, in order to expand the function of the electrical device, the interface circuit of the manufacturer used by the electrical device must be connected to the interface circuit provided by another electrical device manufacturer, but the other electrical device manufacturer may use another control signal of a certain standard (such as a level signal) to control the operation or operation of the electrical device. In this case, a conversion circuit is required between the devices of these two manufacturers (for example, including the interface circuit). Since the hardware and software designs of the devices of these manufacturers are fixed, they are not easy to change. Moreover, for commercial or cost considerations, the manufacturers of both parties are reluctant to change their own hardware or software designs.

[0004] For the existing control signal conversion methods, some traditional practices are to modify the software logic of the device to achieve it. Modifying the software logic generally brings more verification and debugging work. If the modification is improper, it will also cause some software vulnerabilities, thus bringing certain risks. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a signal conversion circuit that can provide signal conversion between devices of these different manufacturers without changing the original hardware and software design. Specifically, the present invention uses some ordinary relays and / or time delay relays to build a signal conversion circuit that converts a level signal (first standard signal) into a pulse signal (second standard signal) and a signal conversion circuit that converts a pulse signal (second standard signal) into a level signal (first standard signal). The signal conversion circuit of the present invention realizes the conversion between a level signal and a pulse signal through a combination of relays. The circuit design is simple, easy to implement, highly reliable, and has a fast circuit response speed. It does not involve software control, which saves software development work and avoids the risks brought by software vulnerabilities. It is especially convenient for on-site implementation and application.

[0006] When designing a signal conversion circuit, if a logic gate circuit is used, a printed circuit board needs to be developed separately, because the logic gate circuit is an electronic component and generally needs to be installed on a printed circuit board. In addition, it is generally necessary to design software logic to cooperate with the logic gate circuit, which will bring more verification and debugging work. In addition, the logic gate circuit is generally only applicable to weak current environments, so it has great limitations on the on-site implementation and application of control signal conversion.

[0007] In order to solve the above problems, the present invention uses relays to design signal conversion circuits, eliminating the development of printed circuit boards and software development work, and provides sufficient flexibility and environmental applicability for on-site implementation and application. Specifically, relays are independently packaged electrical components that can be directly installed without the need to develop printed circuit boards. Moreover, the use of relays to achieve signal conversion belongs to pure hardware circuit design, without the need for software design. In addition, the coil (excitation device) of the relay is completely electrically isolated from the contact (switch), so that the coil and the contact can adopt different power supply forms, and the coil and the contact are available in various voltage forms (such as DC or AC, weak or strong electricity). Therefore, the present invention uses appropriate relays to design a signal conversion circuit, which can convert an input signal suitable for one power supply form into an output signal suitable for another power supply form, and realize signal conversion under any power supply form, thereby providing sufficient flexibility and environmental applicability for on-site implementation and application.

[0008] According to a first aspect of the present invention, a signal conversion circuit is provided, wherein the signal conversion circuit is used to convert a first standard signal into a second standard signal. The signal conversion circuit comprises an input path, a control circuit, and an output path. The input path is used to receive the first standard signal, and the output path is used to output the second standard signal. Each of the input path, the control circuit, and the output path comprises at least one excitation device; each of the input path, the control circuit, and the output path can be controllably connected between two ends of a power supply.

[0009] According to a second aspect of the present invention, a control system is provided. The control system includes: a controller, a signal conversion circuit, an electrical device interface, and an electrical device. The controller is connected to the signal conversion circuit so that a first standard signal generated by the controller is input to the signal conversion circuit. The signal conversion circuit converts the first standard signal into a second standard signal, the signal conversion circuit is connected to the electrical device interface and transmits the second standard signal to the electrical device interface. The electrical device is connected to the electrical device interface and receives the second standard signal from the electrical device interface, and the second standard signal is used to control the operation of the electrical device, wherein the signal conversion circuit is a signal conversion circuit according to the first aspect of the present invention.

[0010] According to a third aspect of the present invention, a signal conversion circuit is provided, the signal conversion circuit is used to convert a second standard signal into a first standard signal. The signal conversion circuit includes an input circuit, a control circuit and an output path. The input circuit is used to receive the second standard signal, and the output path is used to output the first standard signal. Each of the control circuit and the output path includes at least one excitation device. The control circuit and the input circuit are controllably connected in series between the two ends of a power supply, and the output path is controllably connected between the two ends of the power supply.

[0011] According to a fourth aspect of the present invention, a control system is provided. The control system includes a controller, a signal conversion circuit, an electrical device interface, and an electrical device. The controller is connected to the signal conversion circuit so that the second standard signal generated by the controller is input to the signal conversion circuit. The signal conversion circuit converts the second standard signal into a first standard signal. The signal conversion circuit is connected to the electrical device interface and transmits the first standard signal to the electrical device interface. The electrical device is connected to the electrical device interface and receives the first standard signal from the electrical device interface, and the first standard signal is used to operate the electrical device.

[0012] According to a fifth aspect of the present invention, a control system is provided, characterized in that the control system includes a controller, a first signal conversion circuit, a second signal conversion circuit, an electrical device interface, an electrical device and a control panel. The controller is connected to the first signal conversion circuit and the second signal conversion circuit. The first signal conversion circuit and the second signal conversion circuit are both connected to the electrical device interface. The electrical device interface is connected to the electrical device. The controller generates a first standard signal and sends the first standard signal to the first signal conversion circuit, the first signal conversion circuit converts the first standard signal into a second standard signal and sends the second standard signal to the electrical device interface. The electrical device receives the second standard signal from the electrical device interface to operate according to the second standard signal. The control panel is connected to the electrical device interface to control the electrical device interface to generate a second standard signal, the second standard signal generated by the electrical device interface is used to control the operation of the electrical device, and the second signal conversion circuit receives the second standard signal generated by the electrical device interface and converts the received second standard signal into a first standard signal, and the controller receives the first standard signal converted by the second signal conversion circuit to monitor the operation of the electrical device. The first signal conversion circuit is a signal conversion circuit according to the first aspect of the present invention, and the second signal conversion circuit is a signal conversion circuit according to the third aspect of the present invention.

[0013] According to a sixth aspect of the present invention, a control system is provided. The control system includes a controller, a first signal conversion circuit, a second signal conversion circuit, an electrical device interface, an electrical device, and a control panel. The controller is connected to the first signal conversion circuit and the second signal conversion circuit, and the first signal conversion circuit and the second signal conversion circuit are both connected to the electrical device interface. The electrical device interface is connected to the electrical device. The controller generates a second standard signal and sends the second standard signal to the second signal conversion circuit, and the second signal conversion circuit converts the second standard signal into a first standard signal and sends the first standard signal to the electrical device interface. The electrical device receives the first standard signal from the electrical device interface to operate according to the first standard signal. The control panel is connected to the electrical device interface to control the electrical device interface to generate a first standard signal, and the first standard signal generated by the electrical device interface is used to control the operation of the electrical device. In addition, the first signal conversion circuit receives the first standard signal generated by the electrical device interface and converts the received first standard signal into a second standard signal. The controller receives the first standard signal converted by the first signal conversion circuit to monitor the operation of the electrical device. The first signal conversion circuit is a signal conversion circuit according to the first aspect of the present invention, and the second signal conversion circuit is a signal conversion circuit according to the second aspect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1A and Figure 1B The block diagram structures of two embodiments of the control system of the present invention are respectively shown;

[0015] Figure 2A and Figure 2B Shown separately Figure 1A The signal conversion circuit 103 and Figure 1B The block diagram structure of the signal conversion circuit 113 in FIG.

[0016] Figure 3A-3D Shown separately Figure 2A The input path and Figure 2B Details of the circuit diagrams of two embodiments of the input paths in;

[0017] Figure 4A-4G Shown separately Figure 1A The specific structure of the relay used in the signal conversion circuit 103;

[0018] Figures 5A-5C Shown separately Figure 1B The specific structure of the relay used in the signal conversion circuit 113;

[0019] Fig. 6A and Figure 6B Show Figure 2A The signal conversion circuit 103 and Figure 2B Details of the circuit diagram of the signal conversion circuit 113 in FIG.

[0020] Fig. 7A and Figure 7B Shown separately Fig. 6A The signal conversion circuit 103 and Figure 6B A timing waveform diagram of the actions of each relay in the signal conversion circuit 113;

[0021] Figure 8 A system for bidirectional communication between the controller 104 and the electrical device interface 102 is shown, wherein the controller 104 sends and receives level signals;

[0022] Fig. 9 A system for bidirectional communication between the controller 104 and the electrical device interface 102 is shown, wherein the controller 104 sends and receives pulse signals; and

[0023] Fig.10 Show Figure 1A-1B as well as Figure 8-Figure 9 A block diagram structure of an embodiment of the controller 104 in FIG. DETAILED DESCRIPTION

[0024] Various specific embodiments of the present invention will be described below with reference to the accompanying drawings which constitute a part of this specification. It should be understood that, where possible, the same or similar reference numerals used in the present invention refer to the same components.

[0025] Figure 1A and Figure 1B The block diagram structures of two embodiments of the control system of the present invention are shown respectively, wherein Figure 1A The control system 100 includes a signal conversion circuit 103, which is used to convert a level signal (a first standard signal) into a pulse signal (a second standard signal); and Figure 1B The control system 110 includes a signal conversion circuit 113, and the signal conversion circuit 113 is used to convert a pulse signal (second standard signal) into a level signal (first standard signal).

[0026] like Figure 1A As shown, the control system 100 includes a controller 104 (the specific structure of which is shown in FIG. Fig.10 As shown), signal conversion circuit 103 (its specific circuit structure see Fig. 6AAs shown), electrical equipment interface 102 and electrical equipment 101. In the control system 100, the controller 104 can control the operation of the electrical equipment 101. Specifically, the controller 104 is connected to the signal conversion circuit 103 through the connecting line 106. The controller 104 generates a level signal (a first standard signal) and sends the level signal to the signal conversion circuit 103 through the connecting line 106. The signal conversion circuit 103 converts the received level signal into a pulse signal (a second standard signal). The signal conversion circuit 103 is connected to the electrical equipment interface 102 through the connecting line 107. After converting the received level signal into a pulse signal, the signal conversion circuit 103 outputs the converted pulse signal to the electrical equipment interface 102 through the connecting line 107. The electrical equipment 101 is connected to the electrical equipment interface 102 and receives the converted pulse signal from the signal conversion circuit 103 from the electrical equipment interface 102, so as to operate according to the received pulse signal, such as opening or closing the cleaning program.

[0027] In addition, optionally, the control system 100 further includes a control panel 105, which is connected to the electrical device interface 102 and controls the electrical device interface 102 to generate a pulse signal to control the operation of the electrical device 101. In a specific embodiment, the control panel 105 may be provided with some operation keys (not shown), and when a certain operation key on the control panel 105 is pressed, the circuit logic on the control panel 105 controls the electrical device interface 102 to generate a pulse signal. The electrical device 101 receives the generated pulse signal from the electrical device interface 102 to operate according to the generated pulse signal.

[0028] like Figure 1B As shown, the control system 110 includes a controller 104 (the specific structure of which is shown in Fig.10 As shown), signal conversion circuit 113 (its specific circuit structure see Figure 6BAs shown), electrical equipment interface 102 and electrical equipment 101. In the control system 110, the controller 104 can control the operation of the electrical equipment 101. Specifically, the controller 104 is connected to the signal conversion circuit 113 through the connecting line 116. The controller 104 generates a pulse signal (second standard signal) and sends the pulse signal to the signal conversion circuit 113 through the connecting line 116. The signal conversion circuit 113 is connected to the electrical equipment interface 102 through the connecting line 117. After receiving the pulse signal from the controller 104, the signal conversion circuit 113 converts the pulse signal into a level signal (first standard signal) and outputs the converted level signal to the electrical equipment interface 102 through the connecting line 117. The electrical equipment 101 is connected to the electrical equipment interface 102 and receives the converted level signal from the signal conversion circuit 113 from the electrical equipment interface 102, so as to operate according to the received level signal, such as opening or closing the cleaning program.

[0029] In addition, optionally, the control system 110 further includes a control panel 105, which is connected to the electrical device interface 102 and controls the electrical device interface 102 to generate a level signal to control the operation of the electrical device 101. In a specific embodiment, the control panel 105 may be provided with some operation keys (not shown), and when a certain operation key on the control panel 105 is pressed, the circuit logic on the control panel 105 controls the electrical device interface 102 to generate a level signal. The electrical device 101 receives the generated level signal from the electrical device interface 102 to operate according to the generated level signal.

[0030] In a specific embodiment, Figure 1A and 1B The electrical device 101 shown is a fume purifier, and the operation of the electrical device 101 is, for example, turning on or off a cleaning program.

[0031] In a specific embodiment, Figure 1A and 1B The controller 104 shown can remotely control the operation of the electrical device 101. When the remote control of the electrical device 101 fails, the user can manually operate the control panel 105 to control the operation of the electrical device 101.

[0032] It should be noted that in Figure 1A and Figure 1BIn the embodiment, the controller 104, the electrical device 101 and the electrical device interface 102 each have their own software environment and hardware environment. In other words, the control signal of the controller 104 is incompatible with the control signal of the electrical device 101. Of course, we can reprogram the controller 104 or change its hardware environment to make it generate the same control signal as the electrical device 101, but this may cause other parts of the controller 104 to be changed, which will make the controller 104 unstable. Of course, we can also change the software or hardware of the electrical device 101, but this change will also bring about the problem of instability. In the present application, by setting the signal conversion circuit 103 or the signal conversion circuit 113, the mode of the control signal generated by the controller 104 can be converted into the mode of the control signal used by the electrical device 101, so that the software and hardware in the working environment where the modes of the control signals of both parties are located do not need to be changed.

[0033] When designing a signal conversion circuit, of course, we can use a logic gate circuit, but this signal conversion circuit designed with a logic gate circuit can only be used when the control signal of the controller 104 and the electrical device 101 is a signal in a weak current environment, which has great limitations. In addition, the logic gate circuit is an electronic component and generally needs to be installed on a printed circuit board, so a printed circuit board needs to be developed separately. In addition, it may be necessary to design software logic to cooperate with the logic gate circuit, which will bring more verification and debugging work. In this application, by using relays and their circuits (see Figures 4A-4G , 5A-5C and Figure 6A-6B ) to design the signal conversion circuits 103 and 113 can save the development work of printed circuit boards and software, and the controller 104 and the electrical device 101 can use control signals under any power supply form, thereby providing sufficient flexibility and environmental applicability for realizing the conversion of control signals of the controller 104 and the electrical device 101.

[0034] exist Figure 1A and Figure 1B In the embodiment shown, the signal conversion circuits 103 and 113 are composed of pure hardware circuits, which include several relays and their circuits (see Fig. 6A and 6B ). Therefore, the signal conversion circuits 103 and 113 do not involve software, thus eliminating the need for software development. Figures 4A-4G5A-5C) are independently packaged electrical components that can be installed independently, so there is no need for the development of printed circuit boards. In some embodiments, the relays in the signal conversion circuits 103 and 113 are installed in one of the control cabinets where the controller 104 is located and the control cabinets where the electrical device interface 102 is located, without changing the original software and hardware of the controller 104 and the electrical device interface 102. In some embodiments, the relays in the signal conversion circuits 103 and 113 can be installed in a simple control box (which may only include a housing for installing relays without involving a printed circuit board), and then the control box is installed in the control cabinet where the controller 104 is located or in the control cabinet where the electrical device interface 102 is located. In some embodiments, the control box is located outside the control cabinet where the controller 104 and the electrical device interface 102 are located and is connected to the controller 104 and the electrical device interface 102 through electrical connection lines. The above installation includes screw installation, rail installation, and the like.

[0035] Still Figure 1A and Figure 1B In the process, due to the use of relays and their circuits (see Figures 4A-4G , 5A-5C and Figure 6A-6B ) is used to design the signal conversion circuits 103 and 113, so the control signals of the controller 104 and the electrical device 101 are suitable for various power supply forms, such as direct current or alternating current, weak current or strong current, and so on. Specifically, the coil (excitation device) and the contact (switch) of the relay have various voltages to choose from, direct current or alternating current, weak current or strong current. In addition, the coil and the contact of the relay are completely electrically isolated, so the coil and the contact can adopt different power supply forms. For example, when the input signal needs to adopt weak current, it is necessary to select a relay with a weak current coil, and the signal of the controlled device needs strong current, it is necessary to connect the relay contact at the output end to strong current to obtain a strong current signal output. In other words, the signal conversion circuits 103 and 113 can convert signals under any power supply form, thereby providing sufficient flexibility and environmental applicability for realizing the conversion of the control signals of the controller 104 and the electrical device 101.

[0036] Figure 2A and Figure 2B Shown separately Figure 1A The signal conversion circuit 103 and Figure 1B 113 is a block diagram of the signal conversion circuit 113.

[0037] like Figure 2AAs shown, the signal conversion circuit 103 includes an input path 201, a control circuit 202 and an output path 203, and the input path 201, the control circuit 202 and the output path 203 are connected in parallel between the two ends of the power supply. In some industrial electricity, the power supply voltage of the power station is used as the power supply, for example, the power supply is 220V in China, and may be 110V in other countries. In some embodiments, the two ends of the power supply are the live wire and the neutral wire. The input path 201 receives the level signal (first standard signal) via the connecting line 106. In response to the high level of the level signal, the input path 201 is connected, and in response to the low level of the level signal, the input path 201 is disconnected. Those skilled in the art should understand that, through the enlightenment of this embodiment, the input path 201 can be connected in response to the low level of the level signal, and the input path 201 can be disconnected in response to the high level of the level signal. In response to the connection and disconnection of the input path 201, the control circuit 202 generates a series of control signals. In response to a series of control signals generated by the control circuit 202, the output path 203 generates a pulse signal (second standard signal). Each of the input path 201, the control circuit 202 and the output path 203 includes one or more excitation devices, see Fig. 6A In addition, the control circuit 202 also includes at least one excitation delay device, see Fig. 6A In one embodiment, the excitation device and the excitation delay device are coils.

[0038] like Figure 2B As shown, the signal conversion circuit 113 includes an input circuit 211, a control circuit 212 and an output path 213. The input circuit 211 and the control circuit 212 are controllably connected in series at both ends of the power supply, and the output path 213 is controllably connected between the two ends of the power supply. In some industrial electricity, the power supply voltage of the power station is used as the power supply, for example, the power supply is 220V in China and may be 110V in other countries. In some embodiments, the two ends of the power supply are the live wire and the neutral wire. The input circuit 211 receives the pulse signal (second standard signal) via the connecting line 116. In response to the high level of the pulse signal, the input circuit 211 is connected, and in response to the low level of the pulse signal, the input circuit 211 is disconnected. Those skilled in the art should understand that, through the enlightenment of this embodiment, the input circuit 211 can be connected in response to the low level of the pulse signal, and the input circuit 211 can be disconnected in response to the high level of the pulse signal. In response to the connection and disconnection of the input circuit 211, the control circuit 212 generates a series of control signals. In response to a series of control signals generated by the control circuit 212, the output path 213 generates a level signal (a first standard signal). The control circuit 212 and the output path 213 each include one or more excitation devices, see Figure 6B In one embodiment, the excitation device is a coil.

[0039] Figure 3A-3D Shown separately Figure 2A The input path 201 and Figure 2B Detailed description of the circuit diagram of the input circuit 211 in FIG. Figure 3A and Figure 3B They are shown respectively Figure 2A The input path 201 and Figure 2B An implementation of the signal input switch circuit in the input circuit 211 in FIG. Figure 3C and Figure 3D They are shown respectively Figure 2A The input path 201 and Figure 2B Another implementation of the signal input switch circuit in the input circuit 211 in FIG.

[0040] like Figure 3A As shown (combined Fig. 6A ), the input path 201 of the signal conversion circuit 103 includes a signal input switch circuit 304 and an excitation device KA10 (the excitation device KA10 is included in the first relay KA1, see Figure 4A As shown). The signal input switch circuit 304 includes a transistor 301 and a relay composed of an excitation coil 302 and a normally open switch 303, and the normally open switch 303 is coupled to the excitation coil 302. In one embodiment, the transistor 301 is an NPN transistor. The base of the NPN transistor receives a level signal via the connecting line 106, and the collector of the NPN transistor is grounded. The excitation coil 302 is connected between the emitter of the NPN transistor and a DC power supply (such as 12V). The normally open switch 303 and the excitation device KA10 are controllably connected in series between the live wire and the neutral wire. When the NPN transistor receives a high level of the level signal and is turned on, the excitation coil 302 of the relay is energized, so that the normally open switch 303 of the relay is closed, the signal input switch circuit 304 is connected, and then the input path 201 is connected. When the NPN transistor receives the low level of the level signal and does not conduct, the excitation coil 302 of the relay is not energized, so that the normally open switch 303 of the relay is disconnected, the signal input switch circuit 304 is disconnected, and the input path 201 is disconnected. Of course, those skilled in the art can understand that the transistor 301 can be a PNP transistor. When the PNP transistor receives the low level of the level signal and conducts, the excitation coil 302 of the relay is energized, so that the normally open switch 303 of the relay is closed, the signal input switch circuit 304 is connected, and the input path 201 is connected. When the PNP transistor receives the high level of the level signal and does not conduct, the excitation coil 302 of the relay is not energized, so that the normally open switch 303 of the relay is disconnected, the signal input switch circuit 304 is disconnected, and the input path 201 is disconnected.

[0041] like Figure 3BAs shown (combined Figure 6B ), the input circuit 211 of the signal conversion circuit 113 includes a signal input switch circuit 314, and the signal input switch circuit 314 and the control circuit 212 are controllably connected in series between the two ends of the power supply (such as between the live wire and the neutral wire). Figure 3B The structure of the signal input switch circuit 314 shown in FIG. Figure 3A The circuit structure of the signal input switch circuit 304 shown in FIG. Figure 3A Similar to the signal input switch circuit 304 shown in , the transistor 301 in the signal input switch circuit 314 can be an NPN transistor. The base of the NPN transistor receives the pulse signal via the connecting line 116, and the collector of the NPN transistor is grounded. The excitation coil 302 is connected between the emitter of the NPN transistor and a DC power supply (such as 12V). The normally open switch 303 and the control circuit 212 are controllably connected in series between the two ends of the power supply (such as between the live wire and the neutral wire). When the NPN transistor receives the high level of the pulse signal and turns on, the excitation coil 302 of the relay is energized, so that the normally open switch 303 of the relay is closed, the signal input switch circuit 314 is connected, and then the input circuit 211 is connected. When the NPN transistor receives the low level of the pulse signal and does not turn on, the excitation coil 302 of the relay is not energized, so that the normally open switch 303 of the relay is disconnected, the signal input switch circuit 314 is disconnected, and then the input circuit 211 is disconnected. Of course, those skilled in the art can understand that the transistor 301 can be a PNP transistor. When the PNP transistor receives the low level of the pulse signal and turns on, the excitation coil 302 of the relay is energized, so that the normally open switch 303 of the relay is closed, the signal input switch circuit 314 is connected, and then the input circuit 211 is connected. When the PNP transistor receives the high level of the pulse signal and does not turn on, the excitation coil 302 of the relay is not energized, so that the normally open switch 303 of the relay is disconnected, the signal input switch circuit 314 is disconnected, and then the input circuit 211 is disconnected.

[0042] like Figure 3C As shown (combined Fig. 6A ), the input path 201 of the signal conversion circuit 103 includes a signal input switch circuit 305 and an excitation device KA10 (the excitation device KA10 is included in the first relay KA1, see Figure 4AAs shown). The signal input switch circuit 305 in the input path 201 includes a thyristor 311 and a relay consisting of an excitation coil 312 and a normally open switch 313, and the normally open switch 313 is coupled to the excitation coil 312. The control electrode of the thyristor 311 receives the level signal through the connecting line 106, and the cathode of the thyristor 311 is connected to the neutral line. The excitation coil 312 is connected between the live line and the anode of the thyristor 311. The normally open switch 313 and the excitation coil KA10 are controllably connected in series between the live line and the neutral line. When the thyristor 311 receives the high level of the level signal and turns on, the excitation coil 312 is energized, so that the normally open switch 313 is closed, the signal input switch circuit 305 is connected, and then the input path 201 is connected. When the thyristor 311 receives the low level of the level signal and does not conduct, the excitation coil 312 is not energized, so that the normally open switch 313 is disconnected, the signal input switch circuit 305 is disconnected, and then the input path 201 is disconnected.

[0043] like Figure 3D As shown, the structure of the signal input switch circuit 315 in the input circuit 211 and Figure 3C The structure of the signal input switch circuit 305 shown in FIG. 1 is the same as that of the signal input switch circuit 305 shown in FIG. 1 , and will not be described in detail here. The difference is that the control electrode of the thyristor 311 receives the pulse signal through the connecting line 116, and the normally open switch 313 and the control circuit 212 are controllably connected in series between the live wire and the neutral wire. When the thyristor 311 receives the high level of the pulse signal and turns on, the excitation coil 312 is energized, so that the normally open switch 313 is closed to connect the signal input switch circuit 315, and then the input circuit 211 is connected. When the thyristor 311 receives the low level of the pulse signal and does not turn on, the excitation coil 312 is not energized, so that the normally open switch 313 is opened to disconnect the signal input switch circuit 315, and then the input circuit 211 is disconnected.

[0044] Those skilled in the art will appreciate that implementations of the signal input switch circuit for receiving an input signal include but are not limited to the above Figure 3A-3D Two embodiments are shown.

[0045] Figure 4A-4G Shown separately Figure 1A The signal conversion circuit 103 includes a first relay KA1, a second relay KA2, a third relay KA3, a fourth relay KA4, a fifth relay KA5, a first delay relay KT1 and a second delay relay KT2.

[0046] like Figure 4AAs shown, the first relay KA1 includes an excitation device KA10 and a first normally open switch KA11, a second normally open switch KA12 and a normally closed switch KA13 coupled to the excitation device KA10. Figure 4B As shown, the second relay KA2 includes an excitation device KA20 and a first normally open switch KA21 and a second normally open switch KA22 coupled to the excitation device KA20. Figure 4C As shown, the third relay KA3 includes an excitation device KA30 and a normally open switch KA31 coupled to the excitation device KA30. Figure 4D As shown, the fourth relay KA4 includes an excitation device KA40 and a normally open switch KA41 coupled to the excitation device KA40. Figure 4E As shown, the fifth relay KA5 includes an excitation device KA50 and a normally open switch KA51 coupled to the excitation device KA50. Figure 4F As shown, the first time delay relay KT1 includes an excitation delay device KT10 and a normally closed switch KT11 coupled to the excitation delay device KT10. Figure 4G As shown, the second time delay relay KT2 includes an excitation delay device KT20 and a first normally closed switch KT21 and a second normally closed switch KT22 coupled to the excitation delay device KT20.

[0047] Figures 5A-5C Shown separately Figure 1B The specific structure of each relay of the signal conversion circuit 113.

[0048] like Figure 5A As shown, the first relay KA6 includes an excitation device KA60, a first normally open switch KA61, a second normally open switch KA62 and a normally closed switch KA63. Figure 5B As shown, the second relay KA7 includes an excitation device KA70, a first normally closed switch KA71, a second normally closed switch KA72 and a normally open switch KA73. Figure 5C As shown, the third relay KA8 includes an excitation device KA80, a first normally open switch KA81, a second normally open switch KA82, a third normally open switch KA83 and a normally closed switch KA84.

[0049] As known to those skilled in the art, the working modes of the above-mentioned relays KA1, KA2, KA3, KA4, KA5, KA6, KA7, KA8 are as follows: when the excitation device of the relay is energized, the switch circuit of the relay will undergo a predetermined step change, that is, the normally open switch of the relay will be closed and the normally closed switch of the relay will be disconnected; when the excitation device of the relay is powered off, the normally open switch of the relay remains disconnected or the normally closed switch of the relay remains closed. The working modes of the above-mentioned time delay relays KT1 and KT2 are as follows: when the excitation delay device of the time delay relay is energized, the switch circuit of the time delay relay will delay the action according to the set time (for example, time t), that is, the normally closed switch of the time delay relay will be disconnected after the set time. When the excitation device of the time delay relay is powered off, the normally closed switch of the time delay relay remains closed.

[0050] In one embodiment, each of the above-mentioned excitation devices KA10, KA20, KA30, KA40, KA50, KA60, KA70, KA80 and the excitation delay devices KT10 and KT20 are coils.

[0051] Fig. 6A Show Figure 2A Detailed description of the circuit diagram of the signal conversion circuit 103 in FIG. Fig. 6A Show Figure 2A Details of the input path 201, control circuit 202 and output path 203 in the signal conversion circuit 103. Fig. 7A Show Fig. 6A The timing waveform diagram of the action of each relay in the signal conversion circuit 103.

[0052] like Fig. 6A As shown, the input path 201 of the signal conversion circuit 103 includes a signal input switch circuit 304 (for details, see Figure 3A The signal input switch circuit 304 and the excitation device KA10 of the first relay KA1 are controllably connected in series between the two ends of the power supply, for example, Fig. 6A between the live wire and the neutral wire as shown, but the present invention is not limited to Fig. 6A The signal input switch circuit 304 is received from the controller 104 (such as Figure 1A ) receives a level signal (a first standard signal), and in response to the high level or low level of the received level signal, the input path 201 is connected or disconnected (as shown in Figure 3A or 3C). It can be understood by those skilled in the art that Fig. 6A The signal input switch circuit 304 in the embodiment can be replaced by a signal input switch circuit 305 (such as Figure 3Cshown).

[0053] The control circuit 202 of the signal conversion circuit 103 includes a first control path 601, a second control path 602 and a third control path 603. The first control path 601, the second control path 602 and the third control path 603 are connected in parallel between two ends of the power supply (eg, between the live wire and the neutral wire).

[0054] The first control path 601 includes an excitation device KA20 of the second relay KA2, a second normally closed switch KT22 of the second time delay relay KT2, a first normally open switch KA11 of the first relay KA1, and a first normally open switch KA21 of the second relay KA2. The first normally open switch KA11 of the first relay KA1 and the first normally open switch KA21 of the second relay KA2 are connected in parallel to form a first control parallel circuit 604, and the first control parallel circuit 604, the excitation device KA20 of the second relay KA2, and the second normally closed switch KT22 of the second time delay relay KT2 are controllably connected in series between the two ends of the power supply (such as between the live wire and the neutral wire).

[0055] The second control path 602 includes the second normally open switch KA12 of the first relay KA1, the excitation device KA30 of the third relay KA3, the excitation delay device KT10 of the first delay relay KT1, and the normally closed switch KT11 of the first delay relay KT1. The excitation device KA30 of the third relay KA3 and the normally closed switch KT11 of the first delay relay KT1 are connected in series to form a first series circuit 608, the first series circuit 608 and the excitation delay device KT10 of the first delay relay KT1 are connected in parallel to form a second control parallel circuit 605, and the second control parallel circuit 605 and the second normally open switch KA12 of the first relay KA1 are controllably connected in series between the two ends of the power supply (such as between the live wire and the neutral wire).

[0056] The third control path 603 includes an excitation device KA40 of the fourth relay KA4, an excitation delay device KT20 of the second delay relay KT2, a first normally closed switch KT21 of the second delay relay KT2, a normally closed switch KA13 of the first relay KA1, and a second normally open switch KA22 of the second relay KA2. The excitation device KA40 of the fourth relay KA4 is connected in series with the first normally closed switch KT21 of the second delay relay KT2 to form a second series circuit 609, the second series circuit 609 is connected in parallel with the excitation delay device KT20 of the second delay relay KT2 to form a third control parallel circuit 606, and the third control parallel circuit 606, the normally closed switch KA13 of the first relay KA1, and the second normally open switch KA22 of the second relay KA2 are controllably connected in series between the two ends of the power supply (such as between the live wire and the neutral wire).

[0057] The output path 203 of the signal conversion circuit 103 includes the normally open switch KA31 of the third relay KA3, the normally open switch KA41 of the fourth relay KA4, the excitation device KA50 of the fifth relay KA5 and the normally open switch KA51 of the fifth relay KA5. Among them, the normally open switch KA31 of the third relay KA3 and the normally open switch KA41 of the fourth relay KA4 are connected in parallel to form an output parallel circuit 607, and the output parallel circuit 607 and the excitation device KA50 of the fifth relay KA5 are controllably connected in series between the two ends of the power supply (such as between the live wire and the neutral wire), and the normally open switch KA51 of the fifth relay KA5 is coupled to the excitation device KA50 of the fifth relay KA5. The normally open switch KA51 of the fifth relay KA5 provides a signal output, i.e., a pulse signal (second standard signal), to the electrical equipment interface 102 (such as the live wire and the neutral wire) via the connecting line 107. Figure 1A shown).

[0058] Fig. 6A The signal conversion circuit 103 (including a relay and its corresponding excitation device and a switch) receives an input level signal (a first standard signal) and converts it into a pulse signal (a second standard signal) to provide a signal output. Fig. 6A The timing waveform diagram of each relay action in the signal conversion circuit 103 is as follows: Fig. 7A As shown, the state changes of the corresponding excitation devices and switches of each relay are shown in Table 1 below.

[0059] Table 1

[0060] initial T1 T2 T3 T4 T5 T6 T7 T8 Input signal 0 0→1 1 1→0 0 0→1 1 1→0 0 KA10 0 0→1 1 1→0 0 0→1 1 1→0 0 KA11 0 0→1 1 1→0 0 0→1 1 1→0 0 KA12 0 0→1 1 1→0 0 0→1 1 1→0 0 KA13 1 1→0 0 0→1 1 1→0 0 0→1 1 KA20 0 0→1 1 1 1→0 0→1 1 1 1→0 KA21 0 0→1 1 1 1→0 0→1 1 1 1→0 KA22 0 0→1 1 1 1→0 0→1 1 1 1→0 KA30 0 0→1 1→0 0 0 0→1 1→0 0 0 KA31 0 0→1 1→0 0 0 0→1 1→0 0 0 KA40 0 0 0 0→1 1→0 0 0 0→1 1→0 KA41 0 0 0 0→1 1→0 0 0 0→1 1→0 KT10 0 0→1 1 1→0 0 0→1 1 1→0 0 KT11 1 1 1→0 0→1 1 1 1→0 0→1 1 KT20 0 0 0 0→1 1→0 0 0 0→1 1→0 KT21 1 1 1 1 1→0→1 1 1 1 1→0→1 KT22 1 1 1 1 1→0→1 1 1 1 1→0→1 KA50 0 0→1 1→0 0→1 1→0 0→1 1→0 0→1 1→0 KA51(output) 0 0→1 1→0 0→1 1→0 0→1 1→0 0→1 1→0

[0061] For ease of understanding, the above Table 1 is explained as follows:

[0062] For the excitation device, "0" indicates that the excitation device is powered off, "1" indicates that the excitation device is powered on, "0→1" indicates that the excitation device changes from powered off to powered on, and "1→0" indicates that the excitation device changes from powered on to powered off.

[0063] For input signals and output signals, "0" indicates that the signal is at a low level, "1" indicates that the signal is at a high level, "0→1" indicates that the signal changes from a low level to a high level, and "1→0" indicates that the signal changes from a high level to a low level.

[0064] For a switch, "0" means the switch is open, "1" means the switch is closed, "0→1" means the switch changes from open to closed, and "1→0" means the switch changes from closed to open.

[0065] The time intervals between T1 and T2, between T3 and T4, between T5 and T6, and between T7 and T8 are all t seconds.

[0066] Fig. 6A The working process of the excitation device and switch of each relay in the signal conversion circuit 103 is as follows (combined with Fig. 7A ):

[0067] At the initial moment: the input signal is at a low level, the signal input switch circuit 304 is disconnected, the excitation devices of each relay (KA10, KA20, KA30, KA40, KA50, KT1 and KT2) are not energized, the normally open switch remains disconnected, and the normally closed switch remains closed.

[0068] At time T1, the input signal (level signal) changes from low level to high level, the signal input switch circuit 304 is connected, the excitation device KA10 of the first relay KA1 is energized, the first normally open switch KA11 and the second normally open switch KA12 are closed, and the normally closed switch KA13 is opened. The first normally open switch KA11 is closed and the second normally closed switch KT22 of the second delay relay KT2 is closed, so that KA20 is energized, the second normally open switch KA12 is closed and the normally closed switch KT11 of the first delay relay KT1 is closed, so that KA30 is energized, and then the first normally open switch KA21 and the second normally open switch KA22 of the second relay KA2 and the normally open switch KA31 of the third relay KA3 are closed. The normally open switch KA31 is closed, so that the excitation device KA50 of the fifth relay KA5 is energized, so that the normally open switch KA51 of the fifth relay KA5 is closed, and the signal output terminal outputs a high level. The second normally open switch KA12 is closed so that the excitation delay device KT10 of the first delay relay KT1 is energized, and the normally closed switch KT11 of the first delay relay KT1 is disconnected after a delay of t seconds (i.e., at time T2). The normally closed switch KA13 is disconnected so that the excitation device KA40 of the fourth relay KA4 and the excitation delay device KT20 of the second delay relay KT2 are continuously de-energized.

[0069] At time T2, the input signal remains at a high level. As described at time T1, the normally closed switch KT11 of the first delay relay KT1 is disconnected at time T2, and the excitation device KA30 of the third relay KA3 is powered off, and the normally open switch KA31 of the third relay KA3 is disconnected. The normally open switch KA31 is disconnected, causing the excitation device KA50 of the fifth relay KA5 to be powered off, and the normally open switch KA51 of the fifth relay KA5 is disconnected, and the high level of the signal output terminal becomes a low level, that is, a high level pulse of t seconds is output. The states of other excitation devices (for example, KA10, KA20, KA40, KT10, and KT20) are the same as at time T1, that is, KA10, KA20, and KT10 are continuously powered on, and KA40 and KT20 are continuously powered off.

[0070] At time T3, the input signal (level signal) changes from high level to low level, the signal input switch circuit 304 is disconnected, the excitation device KA10 of the first relay KA1 loses power, the first normally open switch KA11 and the first normally open switch KA12 are disconnected, and the normally closed switch KA13 is closed. The first normally open switch KA21 is closed and the second normally closed switch KT22 is closed, so that the excitation device KA20 of the second relay KA2 continues to be powered, and the second normally open switch KA22 remains closed. The normally closed switch KA13 is closed, the second normally open switch KA22 is closed, and the first normally closed switch KT21 is closed, so that the excitation device KA40 of the fourth relay KA4 is powered, and the normally open switch KA41 is closed, and then the excitation device KA50 of the fifth relay KA5 is powered, and the normally open switch KA51 of the fifth relay KA5 is closed, and the low level of the signal output end changes to a high level. The normally closed switch KA13 is closed and the second normally open switch KA22 is closed, so that the excitation delay device KT20 of the second delay relay KT2 is energized, and the first normally closed switch KT21 of the second delay relay KT2 is disconnected after a delay of t seconds (i.e., at time T4). The first normally open switch KA12 is disconnected, so that the excitation device KA30 of the third relay KA3 is continuously de-energized, and the excitation delay device KT10 of the first delay relay KT1 is de-energized, and then the normally closed switch KT11 is closed.

[0071] At time T4, the input signal remains at a low level. As described at time T3, the first normally closed switch KT21 of the second delay relay KT2 is disconnected at time T4, then the excitation device KA40 of the fourth relay KA4 is powered off, the normally open switch KA41 is disconnected, and then the excitation device KA50 of the fifth relay KA5 is powered off, the normally open switch KA51 is disconnected, and the high level of the signal output end becomes a low level, that is, a high level pulse of t seconds is output again. As described at time T3, the second normally closed switch KT22 of the second delay relay KT2 is disconnected at time T4, so that the excitation device KA20 of the second relay KA2 is powered off, and then the second normally open switch KA22 of the second relay KA2 is disconnected. The disconnection of the second normally open switch KA22 causes KT20 to power off, and then the first normally closed switch KT21 and the second normally closed switch KT22 of the second delay relay KT2 are closed again. The state of other excitation devices (for example, KA10, KA30 and KT10) is the same as at time T3, that is, the power-off state is maintained. As described above, at time T4, all excitation devices are reset to the state at the initial time, that is, all are powered off.

[0072] At T5-T8, the above operations at T1-T4 are repeated. That is, when the input signal (level signal) changes from low level to high level, continues at high level, changes from high level to low level, and continues at low level (i.e., a cycle of level signal), the corresponding excitation devices and switches of each relay repeat the above operations at T1-T4, thereby converting the level signal into a pulse signal.

[0073] It should be noted that in Fig. 6A In the signal conversion circuit 103 shown, the application of the second relay KA2 is particularly advantageous. Specifically, the purpose of the second relay KA2 is to prevent the signal output side from erroneously outputting pulses when the circuit is powered on before the signal is input. If there is no second relay KA2, the excitation device KA40 of the fourth relay KA4 will be energized when the circuit is powered on, and then its normally open switch KA41 will be closed, thus causing the excitation device KA50 of the fifth relay KA5 to be energized, so that the output side (i.e., the KA51 end) will output a pulse level of t seconds, which is a false triggering situation and is inconsistent with the conversion logic originally intended to be implemented by the circuit.

[0074] from Fig. 7A It can be seen that each time the input signal (level signal) of the signal conversion circuit 103 changes level, the signal conversion circuit 103 will output a pulse signal with a time of t. Specifically, when the input signal undergoes a rising edge jump, the signal output terminal will synchronously output a pulse signal with a time of t, and when the input signal undergoes a falling edge jump, the signal output terminal will again output a pulse signal with a time of t, and so on. Thus, the signal conversion circuit 103 realizes the conversion of the level signal into a pulse signal.

[0075] Combination Fig. 6A and Fig. 7AIt can be seen that in the signal conversion circuit 103, the application of the first delay relay KT1 and the second delay relay KT2 provides a pulse closing means for the signal output end. Specifically, when the level of the input signal changes each time, only one of the excitation device KA30 of the third relay KA31 and the excitation device KA40 of the fourth relay KA4 will be energized, thereby causing the excitation device KA50 of the fifth relay KA5 to be energized, thereby energizing the normally open switch KA51 to close and output a high level. The first delay relay KT1 immediately cuts off the excitation device KA30 of the third relay KA3 after a delay of t seconds (i.e., at T2 or T6), and the second delay relay KT2 immediately cuts off the excitation device KA40 of the fourth relay KA4 after a delay of t seconds (i.e., at T4 or T8), thereby causing the excitation device KA50 of the fifth relay KA5 to lose power, thereby outputting a pulse level of t seconds. It can be seen from this that the delay time of the excitation devices of the first delay relay KT1 and the second delay relay KT2 for t seconds makes the duration of the pulse signal generated at the signal output end also t seconds. As can be understood by those skilled in the art, the delay times of the excitation devices of the first time delay relay KT1 and the second time delay relay KT2 can be different.

[0076] Further Fig. 7A As shown, one cycle of the level signal (input signal) includes a holding signal. The leading edge transition of the holding signal can be used to start the operation or operation of the electrical device, the trailing edge transition of the holding signal can be used to stop the operation or operation of the electrical device, and the period between the leading edge transition and the trailing edge transition of the holding signal can be used to maintain the operation or operation of the electrical device. The leading edge transition is a rising transition and the trailing edge transition is a falling transition, and there is a high level between the rising transition and the falling transition. Of course, those skilled in the art will appreciate that the leading edge transition and the trailing edge transition can also be specifically implemented as: the leading edge transition is a falling transition and the trailing edge transition is a rising transition, and there is a low level between the falling transition and the rising transition. Further, the time width of the first cycle of the input signal (level signal) (such as Fig. 7A The time interval between T1 and T3 shown in the figure) and the time width of the second cycle (such as Fig. 7A The time intervals between T5 and T7 shown) may be different, but as will be appreciated by those skilled in the art, they may also be the same.

[0077] Further Fig. 7AAs shown, two pulse signals (output signals) form one cycle, the first pulse signal can be used to start the operation or operation of the electrical device, the second pulse signal can be used to stop the operation or operation of the electrical device, and the signal between the first pulse signal and the second pulse signal is used to maintain the operation or operation of the electrical device. In addition, since the time width of the first cycle of the input signal (level signal) and the time width of the second cycle can be different or the same, correspondingly in the output signal, the time width of the two pulse signals in the first cycle (such as the width between T2 and T3) and the time width between the two pulse signals in the second cycle (such as the width between T6 and T7) can also be different or the same.

[0078] Figure 6B Show Figure 2B Detailed description of the circuit diagram of the signal conversion circuit 113 in FIG. Figure 6B Show Figure 2B Details of the input circuit 211, control circuit 212 and output path 213 in the signal conversion circuit 113. Figure 7B Show Figure 6B The timing waveform diagram of the action of each relay in the signal conversion circuit 113.

[0079] like Figure 6B As shown, the signal conversion circuit 113 includes an input circuit 211, a control circuit 212 and an output path 213. The input circuit 211 includes a signal input switch circuit 314 (such as Figure 3B ), for receiving data from the controller 104 (as shown) via the connection line 116 Figure 1B As shown) a pulse signal (second standard signal) is received. It can be understood by those skilled in the art that Figure 6B The signal input switch circuit 314 in the embodiment can be replaced by a signal input switch circuit 315 (such as Figure 3D shown).

[0080] The control circuit 212 includes a first control path 611 and a second control path 612, and the first control path 611 and the second control path 612 are connected in parallel. In addition, the parallel circuit of the first control path 611 and the second control path 612 and the signal input switch circuit 314 are controllably connected in series between the two ends of the power supply, for example, as shown in FIG. Figure 6B However, those skilled in the art should understand that the present invention is not limited to the live wire and the neutral wire. Figure 6B Between the live and neutral wires as shown.

[0081] The first control path 611 includes an excitation device KA60 of the first relay KA6, a first normally open switch KA61 of the first relay KA6, a first normally closed switch KA71 of the second relay KA7, and a normally closed switch KA84 of the third relay KA8. In the first control path 611, the normally closed switch KA84 of the third relay KA8 is connected in parallel with the first normally open switch KA61 of the first relay KA6 to form a first control parallel circuit 613, and the first control parallel circuit 613, the first normally closed switch KA71 of the second relay KA7, and the excitation device KA60 of the first relay KA6 are connected in series.

[0082] The second control path 612 includes an excitation device KA70 of the second relay KA7, a normally closed switch KA63 of the first relay KA6, a first normally open switch KA81 of the third relay KA8, and a normally open switch KA73 of the second relay KA7. In the second control path 612, the first normally open switch KA81 of the third relay KA8 and the normally open switch KA73 of the second relay KA7 are connected in parallel to form a second control parallel circuit 614, and the second control parallel circuit 614, the normally closed switch KA63 of the first relay KA6, and the excitation device KA70 of the second relay KA7 are connected in series.

[0083] The output path 213 includes an excitation device KA80 of the third relay KA8, a second normally open switch KA82 of the third relay KA8, a third normally open switch KA83 of the third relay KA8, a second normally closed switch KA72 of the second relay KA7, and a second normally open switch KA62 of the first relay KA6. In the output path 213, the second normally open switch KA62 of the first relay KA6 and the second normally open switch KA82 of the third relay KA8 are connected in parallel to form an output parallel circuit 615. The output parallel circuit 615, the second normally closed switch KA72 of the second relay KA7, and the excitation device KA80 of the third relay KA8 are controllably connected in series between the two ends of the power supply, and the third normally open switch KA83 of the third relay KA8 is coupled to the excitation device KA80 of the third relay KA8 and provides a signal output, i.e., a level signal (first standard signal), to the electrical equipment interface 102 (such as Figure 1B shown).

[0084] Figure 6B The signal conversion circuit 113 (including a relay and its corresponding switch) receives an input pulse signal (second standard signal) and converts it into a level signal (first standard signal) to provide a signal output. Figure 6B The timing waveform diagram of each relay action in the signal conversion circuit 113 is as follows: Figure 7B As shown, the state changes of the corresponding excitation devices and switches of each relay are shown in Table 2 below.

[0085] Table 2

[0086] initial T1 T2 T3 T4 T5 T6 T7 T8 Input signal 0 0→1 1→0 0→1 1→0 0→1 1→0 0→1 1→0 KA60 0 0→1 1→0 0 0 0→1 1→0 0 0 KA61 0 0→1 1→0 0 0 0→1 1→0 0 0 KA62 0 0→1 1→0 0 0 0→1 1→0 0 0 KA63 1 1→0 0→1 1 1 1→0 0→1 1 1 KA70 0 0 0 0→1 1→0 0 0 0→1 1→0 KA71 1 1 1 1→0 0→1 1 1 1→0 0→1 KA72 1 1 1 1→0 0→1 1 1 1→0 0→1 KA73 0 0 0 0→1 1→0 0 0 0→1 1→0 KA80 0 0→1 1 1→0 0 0→1 1 1→0 0 KA81 0 0→1 1 1→0 0 0→1 1 1→0 0 KA82 0 0→1 1 1→0 0 0→1 1 1→0 0 KA84 1 1→0 0 0→1 1 1→0 0 0→1 1 KA83(output) 0 0→1 1 1→0 0 0→1 1 1→0 0

[0087] For ease of understanding, the above Table 2 is explained as follows:

[0088] For the excitation device, "0" indicates that the excitation device is powered off, "1" indicates that the excitation device is powered on, "0→1" indicates that the excitation device changes from powered off to powered on, and "1→0" indicates that the excitation device changes from powered on to powered off.

[0089] For input signals and output signals, "0" indicates that the signal is at a low level, "1" indicates that the signal is at a high level, "0→1" indicates that the signal changes from a low level to a high level, and "1→0" indicates that the signal changes from a high level to a low level.

[0090] For a switch, "0" means the switch is open, "1" means the switch is closed, "0→1" means the switch changes from open to closed, and "1→0" means the switch changes from closed to open.

[0091] Figure 6B The working process of the corresponding excitation device and switch of each relay in the signal conversion circuit 103 is as follows (combined with Figure 7B ):

[0092] At the initial moment, the input signal (pulse signal) is at a low level. The excitation devices KA60, KA70 and KA80 of each relay are in a power-off state. The first normally open switch KA61 and the second normally open switch KA62 of the first relay KA6 are disconnected, and the normally closed switch KA63 is closed. The first normally closed switch KA71 and the second normally closed switch KA72 of the second relay KA7 are closed, and the normally open switch KA73 is disconnected. The first normally open switch KA81, the second normally open switch KA82 and the third normally open switch KA83 of the third relay KA8 are disconnected, and the normally closed switch KA84 is closed. The output end is at a low level.

[0093] At time T1: the input signal changes from low level to high level, the signal input switch circuit 314 is turned on; the excitation device KA60 of the first relay KA6 is energized, the first normally open switch KA61 and the second normally open switch KA62 are closed, and the normally closed switch KA63 is opened; the excitation device KA80 of the third relay KA8 is energized, the second normally open switch KA82 and the third normally open switch KA83 are closed; the closing of KA83 causes the output signal (level signal) to change from low level to high level. At this time, since the normally closed switch KA63 is opened, the excitation device KA70 is not energized, so the first normally closed switch KA71 and the second normally closed switch KA72 remain closed, and the normally open switch KA73 remains open.

[0094] At time T2: the high level of the input signal changes to a low level, the signal input switch circuit 314 is disconnected, the excitation device KA60 loses power, the first normally open switch KA61 and the second normally open switch KA62 are disconnected, and the normally closed switch KA63 is closed; the excitation device KA70 does not have power, the first normally closed switch KA71 and the second normally closed switch KA72 remain closed, and the normally open switch KA73 remains disconnected; the excitation device KA80 is always powered, the second normally open switch KA82 and the third normally open switch KA83 remain closed, so the output signal provided by KA83 is still at a high level.

[0095] At time T3: the input signal changes from low level to high level, and the signal input switch circuit 314 is turned on. The excitation device KA80 is currently powered, the first normally open switch KA81 is closed, the second normally open switch KA82 and the third normally open switch KA83 remain closed, and the normally closed switch KA84 remains open; the opening of the normally closed switch KA84 makes the excitation device KA60 unable to be powered at present, the first normally open switch KA61 and the second normally open switch KA62 are opened, and the normally closed switch KA63 is closed; the closing of the first normally open switch KA81 enables the excitation device KA70 to be powered, the first normally closed switch KA71 and the second normally closed switch KA72 are opened, and the normally open switch KA73 is closed; the opening of the second normally closed switch KA72 causes the excitation device KA80 to lose power, and then the first normally open switch KA81 becomes open, the second normally open switch KA82 becomes open, the third normally open switch KA83 becomes open, the normally closed switch KA84 becomes closed, and the output signal changes from a high level to a low level.

[0096] At time T4: the input signal changes from high level to low level, and the signal input switch circuit 314 is disconnected; the excitation device KA60 still cannot be powered, the first normally open switch KA61 and the second normally open switch KA62 are disconnected, and the normally closed switch KA63 is closed; KA70 becomes powered off, the first normally closed switch KA71 and the second normally closed switch KA72 are closed, and the normally open switch KA73 is disconnected; because the second normally open switch KA62 and the second normally open switch KA82 are both disconnected at this time, KA80 continues to be powered off, the first normally open switch KA81 remains disconnected, the second normally open switch KA82 remains disconnected, the third normally open switch KA83 remains disconnected, the normally closed switch KA84 remains closed, and the output signal remains at a low level. As described above, at time T4, all the excitation devices are reset to the initial state, that is, they are all powered off.

[0097] In the T5-T8 time period, the above operations of T1-T4 are repeated. That is, when the input signal (pulse signal) is two consecutive pulse signals again, the related excitation devices and switches of each relay repeat the above operations of T1-T4, thereby converting the pulse signal into a level signal.

[0098] It should be noted that in Figure 6B The design in the signal conversion circuit 113 shown realizes the function of changing the output signal from a high level to a low level, and the output signal remains at a low level after the pulse disappears. Specifically, when the output signal is at a high level (i.e., KA83 is closed), when the pulse signal is input again, the excitation device KA70 is powered on, and the power supply of the excitation devices KA60 and KA80 is cut off, so that the output signal changes from a high level to a low level (i.e., KA83 is closed and becomes disconnected), and when the pulse disappears, the excitation device KA70 is also powered off at the same time, and the excitation device KA80 is still in a power-off state, thereby realizing the maintenance of the low level state of the output signal (i.e., KA83 remains disconnected).

[0099] In the signal conversion circuit 113, each time a pulse signal is input, the output signal will jump between a low level and a high level, thereby realizing the conversion of the pulse signal into a level signal. Specifically, when a short-time pulse signal is input to the input end, the signal at the output end will change the current signal state. For example, when the current output signal is at a low level, when a pulse signal is input, the output signal will change from a low level to a high level; when a short-time pulse signal is input to the input end again, the output signal at the output end will change from a high level to a low level again, and this will be repeated.

[0100] It should be noted that Figure 7B The level signal (output signal) and pulse signal (input signal) shown in Fig. 7A The level signal and the pulse signal in are the same type of signal, which will not be described in detail here. In addition, as can be appreciated by those skilled in the art, the pulse duration of each pulse signal (input signal) can be different, for example Figure 7B t1 and t2 are shown.

[0101] Figure 8 The system of bidirectional communication from the controller 104 to the electrical device interface 102 is shown, wherein the controller 104 uses a level signal and the electrical device 101 uses a pulse signal, and they perform bidirectional communication through the signal conversion circuit 103 and the signal conversion circuit 113 .

[0102] like Figure 8As shown, the control system 800 includes a controller 104, a signal conversion circuit 103 (i.e., a first signal conversion circuit), a signal conversion circuit 113 (i.e., a second signal conversion circuit), an electrical device interface 102, an electrical device 101, and a control panel 105. In the control system 800, the controller 104 is connected to the signal conversion circuit 103 via a connecting line 106, the signal conversion circuit 103 is connected to the electrical device interface 102 via a connecting line 107, and the electrical device interface 102 is connected to the electrical device 101. The electrical device interface 102 is also connected to the signal conversion circuit 113 via a connecting line 807, and the signal conversion circuit 113 is connected to the controller 104 via a connecting line 806. Among them, the controller 104, the signal conversion circuit 103, the electrical device interface 102, the electrical device 101, the control panel 105, and the connecting lines 106 and 107 are connected to the electrical device 101. Figure 1A The specific circuit structure of the signal conversion circuit 103 is shown in Fig. 6A The specific circuit structure of the signal conversion circuit 113 is shown in Figure 6B The signal conversion circuit 103 is used to convert the level signal into a pulse signal. The specific conversion method has been described in Fig. 6A and 7A The signal conversion circuit 113 is used to convert the pulse signal into a level signal. The specific conversion method has been described in detail. Figure 6B and 7B This has been explained in detail in , so I will not repeat it here.

[0103] In the control system 800, the controller 104 generates a level signal (a first standard signal) and sends the level signal to the signal conversion circuit 103. After receiving the level signal, the signal conversion circuit 103 converts the level signal into a pulse signal (a second standard signal) and sends the pulse signal to the electrical device interface 102. The electrical device 101 receives the pulse signal from the electrical device interface 102 to operate according to the received pulse signal, such as turning on or off the cleaning program of the electrical device 101.

[0104] And in the control system 800, the control panel 105 is connected to the electrical device interface 102, and controls the electrical device interface 102 to generate a pulse signal. The pulse signal generated by the electrical device interface 102 is used to control the operation of the electrical device 101, such as turning on or off the cleaning program. The signal conversion circuit 113 receives the pulse signal generated by the electrical device interface 102 and converts the received pulse signal into a level signal. The controller 104 receives the converted level signal from the signal conversion circuit 113, and monitors the operation of the electrical device 101 according to the received level signal, such as counting how many times the electrical device 101 is turned on or off in a certain period of time, counting how long it takes between two turns on or off of the cleaning program of the electrical device 101, or how long it takes for the electrical device 101 to be turned on and off. The controller 104 performs such statistics to provide certain data support for the maintenance or repair that may be performed on the electrical device 101.

[0105] The control system 800 provides two-way communication between the controller 104 and the electrical device interface 102, thereby being able to control the operation of the electrical device 101 and monitor the operation of the electrical device 101 through feedback of the operation of the electrical device 101 without changing the signal format (level signal) used by the controller 104 and the signal format (pulse signal) used by the electrical device 101.

[0106] Fig. 9 A system of bidirectional communication from a controller 104 to an electrical device interface 102 is shown, wherein the controller 104 uses a pulse signal and the electrical device 101 uses a level signal, and they perform bidirectional communication through a signal conversion circuit 103 (i.e., a first signal conversion circuit) and a signal conversion circuit 113 (i.e., a second signal conversion circuit).

[0107] like Fig. 9 As shown, the control system 900 includes a controller 104, a signal conversion circuit 103 (i.e., a first signal conversion circuit), a signal conversion circuit 113 (i.e., a second signal conversion circuit), an electrical device interface 102, an electrical device 101, and a control panel 105. In the control system 900, the controller 104 is connected to the signal conversion circuit 113 via a connecting line 116, the signal conversion circuit 113 is connected to the electrical device interface 102 via a connecting line 117, and the electrical device interface 102 is connected to the electrical device 101. The electrical device interface 102 is also connected to the signal conversion circuit 103 via a connecting line 917, and the signal conversion circuit 103 is connected to the controller 104 via a connecting line 916. Among them, the controller 104, the signal conversion circuit 113, the electrical device interface 102, the electrical device 101, the control panel 105, and the connecting lines 116 and 117 are connected to the electrical device 101. Figure 1BThe specific circuit structure of the signal conversion circuit 103 is shown in Fig. 6A The specific circuit structure of the signal conversion circuit 113 is shown in Figure 6B The signal conversion circuit 103 is used to convert the level signal into a pulse signal. The specific conversion method has been described in Fig. 6A and 7A The signal conversion circuit 113 is used to convert the pulse signal into a level signal. The specific conversion method has been described in detail. Figure 6B and 7B This has been explained in detail in , so I will not repeat it here.

[0108] In the control system 900, the controller 104 generates a pulse signal (second standard signal) and sends the pulse signal to the signal conversion circuit 113 via the connection line 116. After receiving the pulse signal, the signal conversion circuit 113 converts the pulse signal into a level signal (first standard signal) and sends the level signal to the electrical device interface 102 via the connection line 117. The electrical device 101 receives the level signal from the electrical device interface 102 to operate according to the received level signal, such as turning on or off the cleaning program of the electrical device 101.

[0109] And in the control system 900, the control panel 105 is connected to the electrical device interface 102, and controls the electrical device interface 102 to generate a level signal, and the level signal generated by the electrical device interface 102 is used to control the operation of the electrical device 101, such as turning on or off the cleaning program, etc. The signal conversion circuit 103 receives the level signal generated by the electrical device interface 102 via the connection line 917 and converts the received level signal into a pulse signal. The controller 104 receives the converted pulse signal from the signal conversion circuit 103 via the connection line 916, and monitors the operation of the electrical device 101 according to the received pulse signal, such as counting how many times the electrical device 101 is turned on or off in a certain period of time, counting how long it takes between two turns on or off of the cleaning program of the electrical device 101, or how long it takes for the electrical device to be turned on and off, etc. The controller 104 performs such statistics to provide certain data support for the maintenance or repair that may be performed on the electrical device 101.

[0110] The control system 900 provides two-way communication between the controller 104 and the electrical device interface 102, thereby being able to control the operation of the electrical device 101 and monitor the operation of the electrical device 101 through feedback of the operation of the electrical device 101 without changing the signal format (pulse signal) used by the controller 104 and the signal format (level signal) used by the electrical device 101.

[0111] Fig.10 Show Figure 1A-1B as well as Figure 8-Figure 9 A block diagram structure of an embodiment of the controller 104 in FIG.

[0112] The controller 104 includes various types of controllers for controlling the operation of the electrical device 101. As an example, Fig.10 As shown, the controller 104 includes a control computer, which includes a bus 1001, a processor 1002, an input interface 1003, an output interface 1005, and a memory 1007, on which a program 1008 is stored. The processor 1002, the input interface 1003, the output interface 1005, and the memory 1007 are respectively connected to the bus for communication, so that the processor 1002 can control the operation of the input interface 1003, the output interface 1005, and the memory 1007. Specifically, the memory 1007 is used to store programs, instructions, and data, and the processor 1002 reads programs, instructions, and data from the memory 1007 and can write data to the memory 1007. The output interface 1005 can be connected to the memory 1007 through a connection line 1006. Figure 1A and Figure 8 The signal conversion circuit 103 or Figure 1B and Fig. 9 The signal conversion circuit 113 in the output signal, and the input interface 1003 can be connected to the Figure 8 The signal conversion circuit 113 or Fig. 9 The signal conversion circuit 103 in receives the signal.

[0113] Although the present invention will be described with reference to the specific embodiments shown in the accompanying drawings, it should be understood that, without departing from the spirit and scope and background of the teachings of the present invention, the two signal conversion circuits of the present invention and various control systems can have many variations. Those skilled in the art will also appreciate that there are different ways to change the structural details in the embodiments disclosed in the present application, all falling within the spirit and scope of the present application and claims.

Claims

1. A signal conversion circuit (103), the signal conversion circuit (103) being used to convert a first standard signal into a second standard signal, characterized in that: The signal conversion circuit (103) comprises: An input channel (201), the input channel (201) being used to receive the first standard signal; control circuit (202); and An output channel (203), the output channel (203) being used to output the second standard signal; Each of the input path (201), the control circuit (202) and the output path (203) includes at least one excitation device (KA10; KA20, KA30, KA40; KA50); Each of the input path (201), the control circuit (202) and the output path (203) is controllably connected between two ends of a power source.

2. The signal conversion circuit (103) according to claim 1, characterized in that: The control circuit (202) also includes at least one excitation delay device (KT10, KT20).

3. The signal conversion circuit (103) according to claim 1, characterized in that: The signal conversion circuit (103) comprises a first relay (KA1), a second relay (KA2), a third relay (KA3), a fourth relay (KA4), a fifth relay (KA5), a first time delay relay (KT1) and a second time delay relay (KT2); The first relay (KA1) comprises an excitation device (KA10), a first normally open switch (KA11), a second normally open switch (KA12) and a normally closed switch (KA13); The second relay (KA2) comprises an excitation device (KA20), a first normally open switch (KA21) and a second normally open switch (KA22); The third relay (KA3) comprises an excitation device (KA30) and a normally open switch (KA31); The fourth relay (KA4) comprises an excitation device (KA40) and a normally open switch (KA41); The fifth relay (KA5) comprises an excitation device (KA50) and a normally open switch (KA51); The first time delay relay (KT1) comprises an excitation delay device (KT10) and a normally closed switch (KT11); The second time delay relay (KT2) comprises an excitation delay device (KT20), a first normally closed switch (KT21) and a second normally closed switch (KT22); The input path (201) comprises a signal input switch circuit (304), the signal input switch circuit (304) is used to receive the first standard signal, the input path (201) also comprises the excitation device (KA10) of the first relay (KA1), the excitation device (KA10) of the first relay (KA1) and the signal input switch circuit (304) are controllably connected in series between two ends of the power supply; The control circuit (202) includes a first control path (601), a second control path (602) and a third control path (603); The first control path (601) includes the excitation device (KA20) of the second relay (KA2), the second normally closed switch (KT22) of the second time delay relay (KT2), ​​the first normally open switch (KA11) of the first relay (KA1) and the first normally open switch (KA21) of the second relay (KA2), wherein in the first control path (601), the first normally open switch (KA11) of the first relay (KA1) and the first normally open switch (KA21) of the second relay (KA2) are connected in parallel to form a first control parallel circuit (604), and the first control parallel circuit (604), the excitation device (KA20) of the second relay (KA2) and the second normally closed switch (KT22) of the second time delay relay (KT2) are controllably connected in series between two ends of the power supply; The second control path (602) includes the second normally open switch (KA12) of the first relay (KA1), the excitation device (KA30) of the third relay (KA3), the excitation delay device (KT10) of the first time delay relay (KT1) and the normally closed switch (KT11) of the first time delay relay (KT1), wherein in the second control path (602), the excitation device (KA30) of the third relay (KA3) and the normally closed switch (KT11) of the first time delay relay (KT1) are connected in series to form a first series circuit (608), the first series circuit (608) and the excitation delay device (KT10) of the first time delay relay (KT1) are connected in parallel to form a second control parallel circuit (605), and the second control parallel circuit (605) and the second normally open switch (KA12) of the first relay (KA1) are controllably connected in series between two ends of the power supply; The third control path (603) includes the excitation device (KA40) of the fourth relay (KA4), the excitation delay device (KT20) of the second time delay relay (KT2), ​​the first normally closed switch (KT21) of the second time delay relay (KT2), ​​the normally closed switch (KA13) of the first relay (KA1) and the second normally open switch (KA22) of the second relay (KA2), wherein in the third control path (603), the excitation device (KA40) of the fourth relay (KA4) and the first normally closed switch (KT21) of the second time delay relay (KT2) are connected in series to form a second series circuit (609), the second series circuit (609) and the excitation delay device (KT20) of the second time delay relay (KT2) are connected in parallel to form a third control parallel circuit (606), and the third control parallel circuit (606), the normally closed switch (KA13) of the first relay (KA1) and the second normally open switch (KA22) of the second relay (KA2) are controllably connected in series between two ends of the power supply; The output path (203) includes the normally open switch (KA31) of the third relay (KA3), the normally open switch (KA41) of the fourth relay (KA4), the excitation device (KA50) of the fifth relay (KA5) and the normally open switch (KA51) of the fifth relay (KA5), Wherein, in the output path (203), the normally open switch (KA31) of the third relay (KA3) and the normally open switch (KA41) of the fourth relay (KA4) are connected in parallel to form an output parallel circuit (607), the output parallel circuit (607) and the excitation device (KA50) of the fifth relay (KA5) are controllably connected in series between the two ends of the power supply, and the normally open switch (KA51) of the fifth relay (KA5) is coupled to the excitation device (KA50) of the fifth relay (KA5) and provides an output.

4. The signal conversion circuit (103) according to claim 3, characterized in that: One cycle of the first standard signal includes a holding signal, the leading edge jump of the holding signal starts the operation or operation of the electrical device, the trailing edge jump of the holding signal stops the operation or operation of the electrical device, and the operation or operation of the electrical device is maintained between the leading edge jump of the holding signal and the trailing edge jump of the holding signal; One cycle of the second standard signal includes two pulse signals, the first pulse signal starts the operation or operation of the electrical device, the second pulse signal stops the operation or operation of the electrical device, and the operation or operation of the electrical device is maintained between the first pulse signal and the second pulse signal.

5. The signal conversion circuit (103) according to claim 4, characterized in that: The leading edge transition is a rising transition and the trailing edge transition is a falling transition, and there is a high level between the rising transition and the falling transition.

6. The signal conversion circuit (103) according to claim 4, characterized in that: The leading edge transition is a falling transition and the trailing edge transition is a rising transition, and there is a low level between the falling transition and the rising transition.

7. The signal conversion circuit (103) according to claim 4, characterized in that: The time widths of the first cycle and the second cycle of the holding signal of the first standard signal can be different, and the time width between two pulse signals in the first cycle and the time width between two pulse signals in the second cycle of the second standard signal can be different.

8. The signal conversion circuit (103) according to claim 2, characterized in that: The excitation device (KA10; KA20, KA30, KA40; KA50) and the excitation delay device (KT10, KT20) are coils.

9. A control system (100), characterized in that: The control system comprises: Controller (104); A signal conversion circuit (103); Electrical equipment interface (102); and Electrical equipment (101), in: The controller (104) is connected to the signal conversion circuit (103) so that the first standard signal generated by the controller (104) is input into the signal conversion circuit (103); The signal conversion circuit (103) converts the first standard signal into a second standard signal, and the signal conversion circuit (103) is connected to the electrical device interface (102) and transmits the second standard signal to the electrical device interface (102); The electrical device (101) is connected to the electrical device interface (102) and receives the second standard signal from the electrical device interface (102), and the second standard signal is used to control the operation of the electrical device (101), wherein the signal conversion circuit (103) is a signal conversion circuit (103) according to any one of claims 1-8.

10. The control system (100) according to claim 9, characterized in that: The control system further comprises a control panel (105), wherein the control panel (105) is connected to the electrical device interface (102) and is capable of controlling the electrical device interface (102) to generate a second standard signal, wherein the second standard signal is used to control the operation of the electrical device (101).

11. The control system (100) according to claim 9 or 10, characterized in that: The electrical device (101) is an oil fume purifier, and the operation of the electrical device (101) is turning on and off a cleaning program.

12. A signal conversion circuit (113), the signal conversion circuit (113) being used to convert a second standard signal into a first standard signal, characterized in that: The signal conversion circuit (113) comprises: An input circuit (211), the input circuit (211) being used for receiving the second standard signal; control circuit (212); and An output channel (213), the output channel (213) being used to output the first standard signal; Each of the control circuit (212) and the output path (213) includes at least one excitation device (KA60, KA70; KA80); The control circuit (212) and the input circuit (211) are controllably connected in series between two ends of a power source, and the output path (213) is controllably connected between two ends of the power source.

13. The signal conversion circuit (113) according to claim 12, characterized in that: The signal conversion circuit (113) comprises a first relay (KA6), a second relay (KA7) and a third relay (KA8); The first relay (KA6) comprises an excitation device (KA60), a first normally open switch (KA61), a second normally open switch (KA62) and a normally closed switch (KA63); The second relay (KA7) comprises an excitation device (KA70), a first normally closed switch (KA71), a second normally closed switch (KA72) and a normally open switch (KA73); The third relay (KA8) comprises an excitation device (KA80), a first normally open switch (KA81), a second normally open switch (KA82), a third normally open switch (KA83) and a normally closed switch (KA84); The input circuit (211) comprises a signal input switch circuit (314); The control circuit (212) comprises a first control path (611) and a second control path (612), the first control path (611) and the second control path (612) being connected in parallel, and the parallel circuit of the first control path (611) and the second control path (612) and the signal input switch circuit (314) are controllably connected in series between two ends of the power supply; The first control path (611) includes the excitation device (KA60) of the first relay (KA6), the first normally open switch (KA61) of the first relay (KA6), the first normally closed switch (KA71) of the second relay (KA7) and the normally closed switch (KA84) of the third relay (KA8), wherein in the first control path (611), the normally closed switch (KA84) of the third relay (KA8) and the first normally open switch (KA61) of the first relay (KA6) are connected in parallel to form a first control parallel circuit (613), and the first control parallel circuit (613), the first normally closed switch (KA71) of the second relay (KA7) and the excitation device (KA60) of the first relay (KA6) are connected in series; The second control path (612) includes the excitation device (KA70) of the second relay (KA7), the normally closed switch (KA63) of the first relay (KA6), the first normally open switch (KA81) of the third relay (KA8) and the normally open switch (KA73) of the second relay (KA7), wherein in the second control path (612), the first normally open switch (KA81) of the third relay (KA8) and the normally open switch (KA73) of the second relay (KA7) are connected in parallel to form a second control parallel circuit (614), and the second control parallel circuit (614), the normally closed switch (KA63) of the first relay (KA6) and the excitation device (KA70) of the second relay (KA7) are connected in series; The output path (213) includes the excitation device (KA80) of the third relay (KA8), the second normally open switch (KA82) of the third relay (KA8), the third normally open switch (KA83) of the third relay (KA8), the second normally closed switch (KA72) of the second relay (KA7) and the second normally open switch (KA62) of the first relay (KA6), Wherein, in the output path (213), the second normally open switch (KA62) of the first relay (KA6) and the second normally open switch (KA82) of the third relay (KA8) are connected in parallel to form an output parallel circuit (615), the output parallel circuit (615), the second normally closed switch (KA72) of the second relay (KA7) and the excitation device (KA80) of the third relay (KA8) are controllably connected in series between the two ends of the power supply, and the third normally open switch (KA83) of the third relay (KA8) is coupled to the excitation device (KA80) of the third relay (KA8) and provides an output.

14. The signal conversion circuit (113) according to claim 12, characterized in that: One cycle of the first standard signal includes a holding signal, the leading edge jump of the holding signal starts the operation or operation of the electrical device, the trailing edge jump of the holding signal stops the operation or operation of the electrical device, and the operation or operation of the electrical device is maintained between the leading edge jump of the holding signal and the trailing edge jump of the holding signal; One cycle of the second standard signal includes two pulse signals, the first pulse signal starts the operation or operation of the electrical device, the second pulse signal stops the operation or operation of the electrical device, and the second pulse signal and the first pulse signal maintain the operation or operation of the electrical device.

15. The signal conversion circuit (113) according to claim 14, wherein the leading edge transition is a rising transition and the trailing edge transition is a falling transition, and there is a high level between the rising transition and the falling transition.

16. The signal conversion circuit (113) according to claim 14, wherein the leading edge transition is a falling transition and the trailing edge transition is a rising transition, and there is a low level between the falling transition and the rising transition.

17. The signal conversion circuit (113) according to claim 14, characterized in that: The time widths of the first cycle and the second cycle of the holding signal of the first standard signal can be different, and the time width between two pulse signals in the first cycle and the time width between two pulse signals in the second cycle of the second standard signal can be different.

18. The signal conversion circuit (113) according to claim 12, characterized in that: The excitation device (KA60, KA70; KA80) is a coil.

19. A control system (110), characterized in that: The control system (110) comprises: Controller (104); A signal conversion circuit (113); Electrical equipment interface (102); and Electrical equipment (101), in: The controller (104) is connected to the signal conversion circuit (113) so that the second standard signal generated by the controller (104) is input into the signal conversion circuit (113); The signal conversion circuit (113) converts the second standard signal into a first standard signal, the signal conversion circuit (113) is connected to the electrical device interface (102) and transmits the first standard signal to the electrical device interface (102); and The electrical device (101) is connected to the electrical device interface (102) and receives the first standard signal from the electrical device interface (102), wherein the first standard signal is used to operate the electrical device (101). Wherein, the signal conversion circuit (113) is the signal conversion circuit (113) according to any one of claims 12-18.

20. The control system (110) according to claim 19, characterized in that: The control system (110) further comprises a control panel (105), wherein the control panel (105) is connected to the electrical device interface (102) and is capable of controlling the electrical device interface (102) to generate a first standard signal, wherein the first standard signal is used to control the operation of the electrical device (101).

21. The control system according to claim 19 or 20, characterized in that: The electrical device (101) is a fume purifier, and the operation of the electrical device (101) is turning on and off a cleaning program.

22. A control system (800), characterized in that: The control system (800) comprises: Controller (104); A first signal conversion circuit (103); A second signal conversion circuit (113); Electrical equipment interface (102); Electrical equipment (101); and Control panel (105); The controller (104) is connected to the first signal conversion circuit (103) and the second signal conversion circuit (113), the first signal conversion circuit (103) and the second signal conversion circuit (113) are both connected to the electrical device interface (102), and the electrical device interface (102) is connected to the electrical device (101); The controller (104) generates a first standard signal and sends the first standard signal to the first signal conversion circuit (103); the first signal conversion circuit (103) converts the first standard signal into a second standard signal and sends the second standard signal to the electrical device interface (102); the electrical device (101) receives the second standard signal from the electrical device interface (102) to operate according to the second standard signal; The control panel (105) is connected to the electrical device interface (102) to control the electrical device interface (102) to generate a second standard signal, the second standard signal generated by the electrical device interface (102) is used to control the operation of the electrical device (101), and the second signal conversion circuit (113) receives the second standard signal generated by the electrical device interface (102) and converts the received second standard signal into a first standard signal, and the controller (104) receives the first standard signal converted by the second signal conversion circuit (113) to monitor the operation of the electrical device (101); The first signal conversion circuit (103) is the signal conversion circuit (103) according to any one of claims 1 to 8, and the second signal conversion circuit (113) is the signal conversion circuit (113) according to any one of claims 12 to 18.

23. The control system (800) according to claim 22, characterized in that: The electrical device (101) is a fume purifier, and the operation of the electrical device (101) is turning on and off a cleaning program.

24. A control system (900), characterized in that: The control system (900) comprises: Controller (104); A first signal conversion circuit (103); A second signal conversion circuit (113); Electrical equipment interface (102); Electrical equipment (101); and Control panel (105); The controller (104) is connected to the first signal conversion circuit (103) and the second signal conversion circuit (113), the first signal conversion circuit (103) and the second signal conversion circuit (113) are both connected to the electrical device interface (102), and the electrical device interface (102) is connected to the electrical device (101); The controller (104) generates a second standard signal and sends the second standard signal to the second signal conversion circuit (113); the second signal conversion circuit (113) converts the second standard signal into a first standard signal and sends the first standard signal to the electrical device interface (102); the electrical device (101) receives the first standard signal from the electrical device interface (102) to operate according to the first standard signal; The control panel (105) is connected to the electrical device interface (102) to control the electrical device interface (102) to generate a first standard signal, the first standard signal generated by the electrical device interface (102) is used to control the operation of the electrical device (101), and the first signal conversion circuit (103) receives the first standard signal generated by the electrical device interface (102) and converts the received first standard signal into a second standard signal, and the controller (104) receives the first standard signal converted by the first signal conversion circuit (103) to monitor the operation of the electrical device (101); The first signal conversion circuit (103) is the signal conversion circuit (103) according to any one of claims 1 to 8, and the second signal conversion circuit (113) is the signal conversion circuit (113) according to any one of claims 12 to 18.

25. The control system (900) according to claim 24, characterized in that: The electrical device (101) is a fume purifier, and the operation of the electrical device (101) is turning on and off a cleaning program.

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