Control pilot function generation circuit

Abstract

Embodiments of the present application disclose a control pilot function generation circuit, comprising: a control module comprising a plurality of control sub-modules, each control sub-module comprising a light-emitting diode; and an optical coupling module comprising a plurality of optical coupling sub-modules, each optical coupling sub-module comprising an optical coupling field-effect transistor, wherein each optical coupling sub-module transmits an electrical signal between the optical coupling sub-module and a corresponding control sub-module, so as to enable electrical conduction between the control module and the optical coupling module and generate a control pilot function generation signal. In the embodiments of the present application, the reference point of the control pilot function generation circuit is the same as the reference point of the system, thereby allowing elimination of a drive level-shifting circuit and facilitating direct driving by a micro-controller unit. In addition, the embodiments of the present application use the optical coupling module to achieve both the function of generating the control pilot function signal and the function of disconnecting the control pilot function generation circuit, thereby greatly reducing the number of components, simplifying the circuit, reducing the volume and cost, and enhancing reliability.

Description

Control and guidance function generation circuit Technical Field

[0001] The present application relates to the field of vehicle-mounted chargers, and in particular to a control and guidance function generating circuit. Background Art

[0002] On-board chargers (OBC) are widely used in new energy vehicles, including but not limited to pure electric new energy vehicles, plug-in hybrid new energy vehicles, hydrogen energy vehicles, etc.

[0003] Currently, the control pilot function (CP) signal generation circuit consists of a field-effect transistor switch circuit and a relay circuit. The field-effect transistor switch circuit is responsible for generating the CP signal, and the relay is responsible for completely disconnecting the CP signal generation circuit when not in operation. In other words, three control signals are required: a CP+ control signal, a CP- control signal, and a relay. The relay switch is a mechanical switch that opens or closes mechanical contacts through electromagnetic drive. Its switching times are limited, which has life issues. In addition, the current CP+ and CP- signal reference points are different from the reference points of the entire system, and cannot be directly driven by a microcontroller unit. It is necessary to add a drive level conversion circuit to control the CP+ and CP- signals.

[0004] In the application of new energy vehicles, automotive electronic equipment is used in high temperature, large vibration, harsh working environment, and has high reliability requirements. However, the circuit contains two parts: switching circuit and relay circuit, with a large number of components, complex circuit, large size, high cost and poor reliability.

[0005] Summary of the Invention

[0006] The embodiment of the present application provides a control and guidance function generating circuit, which realizes a control and guidance function signal generating circuit with a small number of components, a simple circuit, a small size, low cost, and high reliability.

[0007] An embodiment of the present application provides a control and guidance function generating circuit, comprising: a control module, comprising a plurality of control submodules, wherein the plurality of control submodules are connected in parallel, and each of the control submodules comprises a light emitting diode;

[0008] An optical coupling module, comprising a plurality of optical coupling sub-modules, wherein the plurality of optical coupling sub-modules are connected in parallel, and each of the optical coupling sub-modules comprises an optical coupling field effect transistor;

[0009] Each of the optical coupling sub-modules receives an electrical signal from the control sub-module corresponding to the optical coupling sub-module through optical coupling isolation between the corresponding optical coupling field effect transistor and any of the light-emitting diodes, thereby conducting a path between the control module and the optical coupling module and generating a control and guidance function generation signal.

[0010] The multiple control submodules include a first control submodule and a second control submodule, wherein the light emitting diode corresponding to the first control submodule is a first light emitting diode, and the light emitting diode corresponding to the second control submodule is a second light emitting diode.

[0011] Wherein, the first control submodule includes: a first transistor, a first resistor, a second resistor, a third resistor, and the first light-emitting diode; the second control submodule includes: a second transistor, a fourth resistor, a fifth resistor, a sixth resistor, and the second light-emitting diode; wherein,

[0012] The first port of the first light emitting diode and the first port of the second light emitting diode are both connected to one end of a first power source;

[0013] The second port of the first light-emitting diode is connected to the first port of the first resistor, the second port of the first resistor is connected to the collector of the first transistor, the base of the first transistor is connected to the first port of the second resistor and the first port of the third resistor, the second port of the third resistor is connected to the ground; the emitter of the first transistor is connected to the ground;

[0014] The second port of the second light-emitting diode is connected to the first port of the fourth resistor, the other end of the fourth resistor is connected to the collector of the second transistor, the base of the second transistor is connected to the first port of the fifth resistor and the first port of the sixth resistor, the second port of the sixth resistor is connected to the ground; the emitter of the second transistor is connected to the ground.

[0015] In which, the control module also includes: a first control guidance function signal source and a second control guidance function signal source, wherein the first control guidance function signal source is connected to the second port of the second resistor, and the second control guidance function signal source is connected to the second port of the fifth resistor, and the first control guidance function signal source and the second control guidance function signal source are used to generate a high level signal or a low level signal.

[0016] Among them, the multiple optical coupling sub-modules include a first optical coupling sub-module and a second optical coupling sub-module, the optical coupling field effect transistors corresponding to the first optical coupling sub-module include: a first optical coupling field effect transistor and a second optical coupling field effect transistor, and the optical coupling field effect transistors corresponding to the second optical coupling sub-module include: a third optical coupling field effect transistor and a fourth optical coupling field effect transistor.

[0017] The first optical coupling submodule includes: the first optical coupling field effect transistor, the second optical coupling field effect transistor, and a seventh resistor; the second optical coupling submodule includes: the third optical coupling field effect transistor, the fourth optical coupling field effect transistor, and an eighth resistor;

[0018] The drain of the first optical coupling field effect transistor is connected to the port of the second power supply V2, the source of the first optical coupling field effect transistor is connected to the source of the second optical coupling field effect transistor, and the gate of the first optical coupling field effect transistor is connected to the gate of the second optical coupling field effect transistor;

[0019] The drain of the second optical coupling field effect transistor is connected to the first port of the seventh resistor, and the second port of the seventh resistor is connected to the output end of the control and guidance function generating circuit;

[0020] The drain of the third optical coupling field effect transistor is connected to the first port of the eighth resistor, and the second port of the eighth resistor is connected to the output end of the control and guidance function generating circuit;

[0021] The source of the third optical coupling field effect transistor is connected to the source of the fourth optical coupling field effect transistor, the gate of the third optical coupling field effect transistor is connected to the gate of the fourth optical coupling field effect transistor, and the drain of the fourth optical coupling field effect transistor is connected to the port of the third power supply V3;

[0022] The first optical coupling field effect transistor and the second optical coupling field effect transistor are connected to have a bidirectional isolation function; the third optical coupling field effect transistor and the fourth optical coupling field effect transistor are connected to have a bidirectional isolation function.

[0023] Wherein, when the first control and guidance function signal source generates the high-level signal and the second control and guidance function signal source generates the low-level signal, the first control submodule is turned on and the first light-emitting diode generates the electrical signal to conduct the path between the first optical coupling submodule and the first control submodule; and when the second control submodule is not turned on and the second light-emitting diode is not turned on, the path between the second optical coupling submodule and the second control submodule is not conducted;

[0024] The output end of the control and guidance function generating circuit outputs a first control and guidance function generating signal, and the first control and guidance function generating signal is used to output the voltage input by the second power supply V2.

[0025] When the first control and guidance function signal source generates the low-level signal and the second control and guidance function signal source generates the high-level signal, the first control submodule is not turned on, the first light-emitting diode is not turned on, and the first optical coupling submodule is not turned on; and the second control submodule is turned on, and the second light-emitting diode generates the electrical signal to conduct the path between the second optical coupling submodule and the second control submodule;

[0026] The output end of the control and guidance function generating circuit outputs a second control and guidance function generating signal, and the second control and guidance function generating signal is used to output the voltage input by the third power supply V3.

[0027] Wherein, when the first control and guidance function signal source generates the low-level signal and the second control and guidance function signal source generates the low-level signal, the second control submodule is not conductive, and when the first control submodule is not conductive, the second light-emitting diode and the first light-emitting diode are both not conductive and cannot generate the electrical signal, and the second optical coupling submodule and the first optical coupling submodule are both not conductive;

[0028] The output end of the control and guidance function generating circuit is in a high impedance state.

[0029] When the first control and guidance function signal source generates the high-level signal and the second control and guidance function signal source generates the high-level signal, the second control submodule and the first control submodule are both turned on, and the second light-emitting diode and the first light-emitting diode both generate the electrical signal to conduct the path between the first optical coupling submodule and the first control submodule and the path between the second optical coupling submodule and the second control submodule, and the second optical coupling submodule and the first optical coupling submodule are both turned on;

[0030] The output end of the control and guidance function generating circuit outputs 0V.

[0031] It can be seen that the embodiment of the present application proposes a control and guidance function generating circuit, including: a control module, including multiple control sub-modules, the multiple control sub-modules are connected in parallel, and each of the control sub-modules includes a light-emitting diode; an optical coupling module, including multiple optical coupling sub-modules, the multiple optical coupling sub-modules are connected in parallel, and each of the optical coupling sub-modules includes an optical coupling field-effect transistor; each of the optical coupling sub-modules receives the electrical signal of the control sub-module corresponding to the optical coupling sub-module through the optical coupling isolation effect between the corresponding optical coupling field-effect transistor and any of the light-emitting diodes, so as to open the path between the control module and the optical coupling module and generate a control and guidance function generating signal. The CP+ and CP- signals of the control and guidance function generating circuit proposed in the embodiment of the present application use 0V as the reference point, which is the same as the reference point of the system, and is convenient for direct driving by a microcontroller unit. The control and guidance function generating circuit proposed in the embodiment of the present application can eliminate the driving level conversion circuit, simplify the circuit to reduce costs, reduce the number of components, and improve reliability. Moreover, the optical coupling module can simultaneously realize the two functions of generating the control and guidance function signal and completely disconnecting the control and guidance function generating circuit, which can greatly achieve a small number of components, a simple circuit, a small size, low cost, and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0033] FIG1 is a circuit block diagram of a control and guidance function generating circuit provided in an embodiment of the present application;

[0034] FIG2 is a circuit block diagram of a control and guidance function generating circuit provided in an embodiment of the present application;

[0035] FIG3 is a schematic structural diagram of a control and guidance function generating circuit provided in an embodiment of the present application;

[0036] FIG4 is a schematic structural diagram of another control and guidance function generating circuit provided in an embodiment of the present application;

[0037] FIG5 is a schematic structural diagram of another control and guidance function generating circuit provided in an embodiment of the present application;

[0038] FIG6 is a schematic structural diagram of another control and guidance function generating circuit provided in an embodiment of the present application;

[0039] FIG7 is a schematic structural diagram of another control and guidance function generating circuit provided in an embodiment of the present application;

[0040] FIG8 is a schematic structural diagram of another control and guidance function generating circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] The terms "first," "second," "third," and "fourth," etc., in the specification and claims of this application and the accompanying drawings are used to distinguish different objects, not to describe a particular order. In addition, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements, but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0043] References to "embodiments" herein mean that a particular feature, result, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation method, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] As shown in FIG1 , FIG1 is a circuit block diagram of a control and guidance function generating circuit provided in an embodiment of the present application. Referring to FIG1 , the background art solution, a CP pulse width modulation (PWM) circuit, comprises a metal-oxide-semiconductor field-effect transistor (MOS) switch circuit and a relay circuit. The MOS switch circuit includes a first control and guidance function signal source CP+ circuit and a second control and guidance function signal source CP- circuit. The MOS switch circuit is responsible for generating PWM, and the relay is responsible for completely disconnecting the CP PWM generating circuit when not in operation. Furthermore, the relay switch is a mechanical switch that opens or closes mechanical contacts through electromagnetic drive. Its switching times are limited, resulting in a lifespan issue. Furthermore, the first control and guidance function signal source CP+ and the second control and guidance function signal source CP- need to use a -12V reference point, rather than a 0V reference point, which is different from the system reference point. Therefore, a drive level conversion circuit is required to control the signals of the first control and guidance function signal source CP+ and the second control and guidance function signal source CP-. In summary, it can be seen that the control and guidance function generating circuit shown in Figure 1 is relatively complex, has many electronic components, and has low reliability. To address the above problems, a control and guidance function generating circuit is provided, which eliminates the relay circuit and the driving level conversion circuit, thereby realizing a control and guidance function signal generating circuit with a small number of components, a simple circuit, a small size, low cost, and high reliability.

[0045] Please refer to FIG2 , which is a circuit block diagram of a control and guidance function generating circuit provided in an embodiment of the present application. The control and guidance function generating circuit may include: a control module 100 and an optical coupling module 200;

[0046] The control module 100 includes a plurality of control submodules connected in parallel, each of which includes a light emitting diode;

[0047] The optical coupling module 200 includes a plurality of optical coupling sub-modules, which are connected in parallel, and each optical coupling sub-module includes an optical coupling field effect transistor;

[0048] Each of the optical coupling sub-modules receives an electrical signal from the control sub-module corresponding to the optical coupling sub-module through optical coupling isolation between the corresponding optical coupling field effect transistor and any of the light-emitting diodes, thereby conducting a path between the control module and the optical coupling module and generating a control and guidance function generation signal.

[0049] Specifically, the multiple control submodules include a first control submodule 110 and a second control submodule 120, and the multiple optical coupling submodules include a first optical coupling submodule 210 and a second optical coupling submodule 220. The first optical coupling submodule 210 performs on-off control by receiving an electrical signal from the first control submodule 110, and the second optical coupling submodule 220 performs on-off control by receiving an electrical signal from the second control submodule 120.

[0050] There are many possible solutions for the circuit in each module, which are not limited here.

[0051] It can be seen that in this embodiment, the driving level conversion circuit can be omitted, the circuit can be simplified to reduce costs, the number of components can be reduced, and reliability can be improved. The optical coupling module can simultaneously realize the two functions of generating a control and guidance function signal and completely disconnecting the control and guidance function generating circuit, which can greatly achieve a small number of components, a simple circuit, a small size, low cost, and high reliability.

[0052] In one possible embodiment, please refer to Figure 3, which is a schematic diagram of the structure of a control and guidance function generating circuit provided in an embodiment of the present application. The various circuits in this embodiment will be described in detail below in conjunction with Figure 3. As shown in Figure 3, the multiple control submodules include a first control submodule 110 and a second control submodule 120, wherein the light-emitting diode corresponding to the first control submodule 110 is a first light-emitting diode L1, and the light-emitting diode corresponding to the second control submodule 120 is a second light-emitting diode L2.

[0053] The first port of the first light emitting diode L1 is connected to one end of the first power supply VDD, and one end of the second light emitting diode L2 is also connected to one end of the first power supply VDD.

[0054] Specifically, the first control submodule 110 may include: a first transistor Q1, a first resistor R1, a second resistor R2, a third resistor R3, and the first light-emitting diode L1; the second control submodule 120 includes: a second transistor Q2, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and the second light-emitting diode L2; wherein,

[0055] The first port of the first light emitting diode L1 and the first port of the second light emitting diode L2 are both connected to one end of a first power supply VDD;

[0056] The second port of the first light-emitting diode L1 is connected to the first port of the first resistor R1, the second port of the first resistor R1 is connected to the collector of the first transistor Q1, the base of the first transistor Q1 is connected to the first port of the second resistor R2 and the first port of the third resistor R3, the second port of the third resistor R3 is connected to the ground; the emitter of the first transistor Q1 is connected to the ground;

[0057] The second port of the second light-emitting diode L2 is connected to the first port of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the collector of the second transistor Q2, the base of the second transistor Q2 is connected to the first port of the fifth resistor R5 and the first port of the sixth resistor R6, and the second port of the sixth resistor R6 is connected to the ground; the emitter of the second transistor Q2 is connected to the ground.

[0058] Wherein, the first transistor Q1 and the second transistor Q2 may be NPN transistors;

[0059] Specifically, the control module 100 also includes: a first control guidance function signal source CP+ and a second control guidance function signal source CP-, wherein the first control guidance function signal source CP+ is connected to the second port of the second resistor R2, and the second control guidance function signal source CP- is connected to the second port of the fifth resistor R5, and the first control guidance function signal source CP+ and the second control guidance function signal source CP- are used to generate a high level signal or a low level signal.

[0060] Among them, the first control and guidance function signal source CP+ can generate a high level or a low level, and the second control and guidance function signal source CP- can also generate a high level or a low level. When the first control and guidance function signal source CP+ generates a high level, the second control and guidance function signal source CP- can generate a high level or a low level. When the first control and guidance function signal source CP+ generates a low level, the second control and guidance function signal source CP- can generate a high level or a low level.

[0061] For example, when the first control and steering function signal source CP+ generates a high level, the collector and emitter of the first transistor Q1 are conductive, and current input from the first power supply VDD flows through the first light-emitting diode L1, the first resistor R1, and the collector and emitter of the first transistor Q1 to ground, causing the first light-emitting diode L1 to turn on and emit light. When the second steering function signal source CP- generates a high level, the collector and emitter of the second transistor Q2 are conductive, and current input from the first power supply VDD flows through the second light-emitting diode L2, the second resistor R2, and the collector and emitter of the second transistor Q2 to ground, causing the second light-emitting diode L2 to turn on and emit light. When the first control and steering function signal source CP+ generates a low level, the collector and emitter of the first transistor Q1 are not conductive, and since a circuit cannot be formed between the first power supply VDD and ground, the first light-emitting diode L1, the first resistor R1, and the first transistor Q1 are all non-conductive, and the first light-emitting diode L1 does not emit light. When the second boot function signal source CP- generates a low level, the collector and emitter of the second transistor Q2 are not conductive, and a loop cannot be formed between the first power supply VDD and the ground. The second light-emitting diode L2, the second resistor R2, and the second transistor Q2 are all non-conductive, and the second light-emitting diode L2 does not emit light.

[0062] It can be seen that in this embodiment, through the circuit connection method in this embodiment, the optical coupling module can simultaneously realize the two functions of generating a control and guidance function signal and completely disconnecting the control and guidance function generating circuit, which can greatly achieve a small number of components, a simple circuit, a small size, a low cost, and high reliability.

[0063] In a possible embodiment, please refer to Figure 3 again. The multiple optical coupling sub-modules include a first optical coupling sub-module 210 and a second optical coupling sub-module 220. The optical coupling field effect transistors corresponding to the first optical coupling sub-module 210 may include: a first optical coupling field effect transistor F1 and a second optical coupling field effect transistor F2. The optical coupling field effect transistors corresponding to the second optical coupling sub-module include: a third optical coupling field effect transistor F3 and a fourth optical coupling field effect transistor F4.

[0064] Specifically, the first optical coupling sub-module 210 may include: the first optical coupling field effect transistor F1, the second optical coupling field effect transistor F2, and a seventh resistor R7; the second optical coupling sub-module 220 includes: the third optical coupling field effect transistor F3, the fourth optical coupling field effect transistor F4, and an eighth resistor R8, wherein the drain of the first optical coupling field effect transistor F1 is connected to the port of the second power supply V2, the source of the first optical coupling field effect transistor F1 is connected to the source of the second optical coupling field effect transistor F2, and the gate of the first optical coupling field effect transistor F1 is connected to the gate of the second optical coupling field effect transistor F2;

[0065] The drain of the second optical coupling field effect transistor F2 is connected to the first port of the seventh resistor R7, and the second port of the seventh resistor R7 is connected to the output terminal CP of the control and guidance function generating circuit;

[0066] The drain of the third optical coupling field effect transistor F3 is connected to the first port of the eighth resistor R8, and the second port of the eighth resistor R8 is connected to the output terminal CP of the control and guidance function generating circuit;

[0067] The source of the third optical coupling field effect transistor F3 is connected to the source of the fourth optical coupling field effect transistor F4, the gate of the third optical coupling field effect transistor F3 is connected to the gate of the fourth optical coupling field effect transistor F4, and the drain of the fourth optical coupling field effect transistor F4 is connected to the port of the third power supply V3; the first optical coupling field effect transistor and the second optical coupling field effect transistor are connected to have a bidirectional blocking effect; the third optical coupling field effect transistor and the fourth optical coupling field effect transistor are connected to have a bidirectional blocking effect.

[0068] The first optical coupling field effect transistor (FET) F1 and the second optical coupling field effect transistor (FET) F2 are connected in a cascode configuration, while the third optical coupling field effect transistor (FET) F3 and the fourth optical coupling field effect transistor (FET) F4 are connected in a cascode configuration. Because parasitic body diodes are connected between the drain and source electrodes of the first, second, third, and fourth optical coupling field effect transistors (FET) F1, F2, F3, and F4, even when no gate-source drive voltage is applied, external signals can still flow through these body diodes, causing the FETs to be in a unidirectional blocking state. The purpose of adopting a back-to-back connection (i.e., a cascode connection) is to ensure that the body diodes of the two FETs are in a bidirectional blocking state when no drive signal is applied.

[0069] Among them, the first optical coupling field effect transistor F1, the second optical coupling field effect transistor F2, the third optical coupling field effect transistor F3, and the fourth optical coupling field effect transistor F4 can be P-channel field effect transistors; the first optical coupling field effect transistor F1 and the second optical coupling field effect transistor F2 can form a photosensitive isolation back-to-back field effect transistor; the third optical coupling field effect transistor F3 and the fourth optical coupling field effect transistor F4 can form a photosensitive isolation back-to-back field effect transistor; the first optical coupling field effect transistor F1, the second optical coupling field effect transistor F2, the third optical coupling field effect transistor F3, and the fourth optical coupling field effect transistor F4 have parasitic body diodes.

[0070] Specifically, when the first control and guidance function signal source CP+ generates the high-level signal and the second control and guidance function signal source CP- generates the low-level signal, the first control submodule is turned on, and the first light-emitting diode L1 generates the electrical signal to conduct the path between the first optical coupling submodule 210 and the first control submodule 110, and the second control submodule 120 is not turned on, the second light-emitting diode L2 is not turned on, and the path between the second optical coupling submodule 220 and the second control submodule 120 is not conducted; the output end CP of the control and guidance function generating circuit outputs the first control and guidance function generating signal, and the first control and guidance function generating signal is used to output the voltage input by the second power supply V2.

[0071] For example, when the first control and steering function signal source CP+ generates a high-level signal, the collector and emitter of the first transistor Q1 are conductive, and the current input from the first power supply VDD can flow through the first light-emitting diode L1, the first resistor R1, and the first transistor Q1 to ground, forming a closed loop. The first light-emitting diode L1 can emit light, which in turn causes the first optical coupling field-effect transistor F1 and the second optical coupling field-effect transistor F2 in the first optical coupling sub-module 210 to be conductive. Therefore, the current input from the second power supply V2 can flow from the drain of the first optical coupling field-effect transistor F1 to the source, then through the source and drain of the second optical coupling field-effect transistor F2, and after voltage division by the seventh resistor R7, reach the output terminal CP of the control and steering function generating circuit. The output terminal CP of the control and steering function generating circuit then outputs the voltage input from the second power supply V2. However, if the second control and steering function signal source CP- inputs a low-level signal at this time, the closed loop cannot be formed, the second light-emitting diode L2 cannot be conductive, and the second optical coupling sub-module cannot be conductive.

[0072] In a possible embodiment, please refer to Figure 3. When the first control and guidance function signal source CP+ generates the low-level signal and the second control and guidance function signal source CP- inputs the high-level signal, the first control submodule 110 is not turned on, the first light-emitting diode L1 is not turned on, the first optical coupling submodule 210 is not turned on, and the second control submodule 120 is turned on, and the second light-emitting diode L2 generates the electrical signal to turn on the path between the second optical coupling submodule 220 and the second control submodule 120; the output terminal CP of the control and guidance function generating circuit outputs the second control and guidance function generating signal, and the second control and guidance function generating signal is used to output the voltage input by the third power supply V3.

[0073] For example, when the second control and steering function signal source CP- generates a high-level signal, the collector and emitter of the second transistor Q2 are conductive, and the current input from the first power supply VDD can flow through the second light-emitting diode L2, the second resistor R2, and the second transistor Q2 to ground, forming a closed loop. The second light-emitting diode L2 can emit light, which in turn causes the third and fourth optical coupling field-effect transistors F3 and F4 in the second optical coupling sub-module 220 to conduct. Therefore, the current input from the third power supply V3 can flow from the drain to the source of the fourth optical coupling field-effect transistor F4, then flow through the source and drain of the third optical coupling field-effect transistor F3, and after voltage division by the eighth resistor R8, reach the output terminal CP of the control and steering function generating circuit. The output terminal CP of the control and steering function generating circuit then outputs the voltage input from the third power supply V3. However, if the first control and steering function signal source CP+ inputs a low-level signal at this time, the closed loop cannot be formed, the first light-emitting diode L1 cannot be turned on, and the first optical coupling sub-module cannot be turned on.

[0074] It can be seen that in this embodiment, through the circuit connection method in this embodiment, the optical coupling module can simultaneously realize the two functions of generating a control and guidance function signal and completely disconnecting the control and guidance function generating circuit, which can greatly achieve a small number of components, a simple circuit, a small size, a low cost, and high reliability.

[0075] In a possible embodiment, when the first control and guidance function signal source CP+ generates the low-level signal and the second control and guidance function signal source CP- inputs the low-level signal, the second control submodule 120 is not conductive, and the first control submodule 110 is not conductive, then the second light-emitting diode L2 and the first light-emitting diode L1 are both not conductive and cannot generate the electrical signal, then the second optical coupling submodule 220 and the first optical coupling submodule 210 are both not conductive; the output end of the control and guidance function generating circuit is in a high impedance state.

[0076] Among them, when the first control and guidance function signal source CP+ and the second control and guidance function signal source CP- both input the low-level signal, the second control submodule 120 and the first control submodule 110 cannot form a closed loop, and then there is no conduction between the first optical coupling field effect transistor F1 and the second optical coupling field effect transistor F2, and there is no conduction between the third optical coupling field effect transistor F3 and the fourth optical coupling field effect transistor F4, then the output terminal CP of the control and guidance function generating circuit cannot output a signal and is in a high impedance state.

[0077] It can be seen that in this embodiment, by controlling the high and low levels of the first control and guidance function signal source and the second control and guidance function signal source, the output signal of the output end of the control and guidance function generating circuit can be controlled. The optical coupling module can simultaneously realize the two functions of generating the control and guidance function signal and completely disconnecting the control and guidance function generating circuit, which can greatly achieve a small number of components, a simple circuit, a small size, a low cost, and a high reliability.

[0078] In a possible embodiment, when the first control and guidance function signal source CP+ generates the high-level signal and the second control and guidance function signal source CP- inputs the high-level signal, the second control submodule 120 and the first control submodule 110 are both turned on, then the second light-emitting diode L2 and the first light-emitting diode L1 both generate the electrical signal to conduct the path between the first optical coupling submodule 210 and the first control submodule 110 and the path between the second optical coupling submodule 220 and the second control submodule 120, then the second optical coupling submodule 220 and the first optical coupling submodule 210 are both turned on; the output end of the control and guidance function generating circuit outputs 0V.

[0079] When the first control and steering function signal source CP+ generates a high-level signal, the collector and emitter of the first transistor Q1 are conductive, and the current input from the first power supply VDD can flow through the first light-emitting diode L1, the first resistor R1, and the first transistor to ground, forming a closed loop. The first light-emitting diode L1 can emit light, which causes the first optical coupling field-effect transistor F1 and the second optical coupling field-effect transistor F2 in the first optical coupling sub-module 210 to be conductive. Therefore, the current input from the second power supply V2 can flow from the drain to the source of the first optical coupling field-effect transistor F1, then flow through the source and drain of the second optical coupling field-effect transistor F2, and after voltage division by the seventh resistor R7, reach the output terminal CP of the control and steering function generating circuit. The output terminal CP of the control and steering function generating circuit then outputs the voltage input by the second power supply V2. At the same time, when the second control and steering function signal source CP- generates a high-level signal, the collector and emitter of the second transistor Q2 are conductive, and the current input from the first power supply VDD can flow through the second light-emitting diode L2, the second resistor R2, and the second transistor Q2 to ground, forming a closed loop. The second light-emitting diode L2 can emit light, which causes the third optical coupling field-effect transistor F3 and the fourth optical coupling field-effect transistor F4 in the second optical coupling sub-module 220 to be conductive. Therefore, the current input from the third power supply V3 can flow from the drain to the source of the fourth optical coupling field-effect transistor F4, then flow through the source and drain of the third optical coupling field-effect transistor F3, and after voltage division by the eighth resistor R8, reach the output terminal CP of the control and steering function generating circuit. The output terminal CP of the control and steering function generating circuit then outputs the voltage input by the third power supply V3. However, since the voltages at the two levels of the power supply are opposite, the current always flows from the positive pole to the negative pole. Therefore, the current flow can be from the second power supply V2 to the third power supply V3, and the two ends of the output end CP of the control and guidance function generating circuit have a symmetrical structure. The seventh resistor R7 and the eighth resistor R8 are the same, so 0V is output at the output end CP of the control and guidance function generating circuit.

[0080] It can be seen that in this embodiment, by controlling the high and low levels of the first control and guidance function signal source and the second control and guidance function signal source, the output signal of the output end of the control and guidance function generating circuit can be controlled. The optical coupling module can simultaneously realize the two functions of generating the control and guidance function signal and completely disconnecting the control and guidance function generating circuit, which can greatly achieve a small number of components, a simple circuit, a small size, a low cost, and a high reliability.

[0081] In one possible embodiment, please refer to FIG4 , which is a schematic diagram of the structure of another control and guidance function generating circuit provided in an embodiment of the present application. FIG4 is further obtained based on FIG3 . Based on FIG3 , the control and guidance function generating circuit shown in FIG4 also includes: a first field effect transistor Q3 and a second field effect transistor Q4. The first field effect transistor Q3 and the second field effect transistor Q4 replace the functions of the first transistor Q1 and the second transistor Q2 in FIG3 ; one end of the first resistor R1 is connected to the first light-emitting diode L1, and the other end is connected to the drain of the first field effect transistor Q3. The source of the first field effect transistor Q3 is connected to ground, and the gate is connected to one end of the second resistor R2 and one end of the third resistor R3; one end of the fourth resistor R4 is connected to the second light-emitting diode L2, and the other end is connected to the drain of the second field effect transistor Q4. The source of the second field effect transistor Q4 is connected to ground, and the gate is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6. The remaining structure of the control and guidance function generating circuit is the same as that of FIG3 , and will not be repeated here.

[0082] Specifically, when the first control and steering function signal source CP+ inputs a high level, the drain and source of the first field-effect transistor Q3 are conductive, and the current input from the first power supply VDD can flow through the first light-emitting diode L1, the first resistor R1, and the first field-effect transistor Q3 to ground, forming a closed loop, and the first light-emitting diode L1 can emit light. However, if the second control and steering function signal source CP- inputs a low level at this time, the closed loop cannot be formed, and the second light-emitting diode L2 cannot be turned on. When the second control and steering function signal source CP- inputs a high level, the drain and source of the second field-effect transistor Q4 are conductive, and the current input from the first power supply VDD can flow through the second light-emitting diode L2, the fourth resistor R4, and the second field-effect transistor Q4 to ground, forming a closed loop, and the second light-emitting diode L2 can emit light. However, if the second control and steering function signal source CP- inputs a low level at this time, the closed loop cannot be formed, and the second light-emitting diode L2 cannot be turned on. The rest of the structure is the same as that of the control and steering function generating circuit in FIG3 and will not be described in detail here.

[0083] It can be seen that in this embodiment, the first field effect transistor Q3 and the second field effect transistor Q4 can also achieve different effects of on-off conditions in different high and low level conditions. By controlling the high and low levels of the first control and guidance function signal source and the second control and guidance function signal source, the output signal of the output end of the control and guidance function generating circuit can be controlled. The optical coupling module can simultaneously realize the two functions of generating the control and guidance function signal and completely disconnecting the control and guidance function generating circuit, which can greatly achieve a small number of components, a simple circuit, a small size, low cost, and high reliability.

[0084] In one possible embodiment, please refer to FIG. 5 , which is a schematic diagram of the structure of another control and guidance function generating circuit provided in an embodiment of the present application. FIG. 5 is further derived based on FIG. Based on FIG. 3 , the control and guidance function generating circuit shown in FIG. 5 further includes: a first insulated gate bipolar transistor Q5 and a second insulated gate bipolar transistor Q6. The first insulated gate bipolar transistor Q5 replaces the first transistor Q1 in FIG. 3 , and the second insulated gate bipolar transistor Q6 replaces the second transistor Q2 in FIG. 3 . One end of the first resistor R1 is connected to the first light-emitting diode L1, and the other end is connected to the drain of the first insulated gate bipolar transistor Q5. The source of the first insulated gate bipolar transistor Q5 is connected to the ground, and the gate is connected to one end of the second resistor R2 and one end of the third resistor R3; one end of the fourth resistor R4 is connected to the second light-emitting diode L2, and the other end is connected to the drain of the second insulated gate bipolar transistor Q6. The source of the second insulated gate bipolar transistor Q6 is connected to the ground, and the gate is connected to one end of the fifth resistor R5 and one end of the sixth resistor R6. The remaining structure is the same as that of the control and guidance function generating circuit in Figure 3, and will not be repeated here.

[0085] When the first control and steering function signal source CP+ inputs a high level, the drain and source of the first insulated gate bipolar transistor Q5 are conductive, and the current input from the first power supply VDD can flow through the first light-emitting diode L1, the first resistor R1, and the first insulated gate bipolar transistor Q5 to ground, forming a closed loop, and the first light-emitting diode L1 can emit light. However, if the second control and steering function signal source CP- inputs a low level at this time, the closed loop cannot be formed, and the second light-emitting diode L2 cannot be turned on. When the second control and steering function signal source CP- inputs a high level, the drain and source of the second insulated gate bipolar transistor Q6 are conductive, and the current input from the first power supply VDD can flow through the second light-emitting diode L2, the fourth resistor R4, and the second insulated gate bipolar transistor Q6 to ground, forming a closed loop, and the second light-emitting diode L2 can emit light. However, if the second control and steering function signal source CP- inputs a low level at this time, the closed loop cannot be formed, and the second light-emitting diode L2 cannot be turned on. The rest of the structure is the same as that of the control and steering function generating circuit of FIG. 3 and will not be described in detail here.

[0086] It can be seen that in this embodiment, the first insulated gate bipolar transistor Q5 and the second insulated gate bipolar transistor Q6 can also achieve different on-off effects in different high and low level conditions. By controlling the high and low levels of the first control and guidance function signal source and the second control and guidance function signal source, the output signal of the output end of the control and guidance function generating circuit can be controlled. The optical coupling module can simultaneously realize the two functions of generating the control and guidance function signal and completely disconnecting the control and guidance function generating circuit, which can greatly achieve a small number of components, a simple circuit, a small size, low cost, and high reliability.

[0087] In a possible embodiment, please refer to Figure 6, which is a structural diagram of another control and guidance function generating circuit provided by an embodiment of the present application. Figure 6 is further obtained on the basis of Figure 3. On the basis of Figure 3, the control and guidance function generating circuit shown in Figure 6 deletes the first transistor Q1, the first resistor R1, the second resistor R2, the third resistor R3, the second transistor Q2, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6. The first control and guidance function signal source CP+ and the second control and guidance function signal source CP- input high level or low level to control the on and off of the first light-emitting diode L1 and the second light-emitting diode L2, thereby achieving the function of controlling the light-emitting diodes.

[0088] One end of the first light-emitting diode L1 is connected to the first power supply VDD, and the other end of the first light-emitting diode L1 is connected to the first control and guidance function signal source CP+. When the first control and guidance function signal source CP+ inputs a high level, the first light-emitting diode L1 is turned off. When the first control and guidance function signal source CP+ inputs a low level, the first light-emitting diode L1 is turned on, and the first light-emitting diode L1 emits light. One end of the second light-emitting diode L2 is connected to the first power supply VDD, and the other end of the second light-emitting diode L2 is connected to the first control and guidance function signal source CP+. When the first control and guidance function signal source CP+ inputs a high level, the second light-emitting diode L2 is turned off. When the second control and guidance function signal source CP+ inputs a low level, the second light-emitting diode L2 is turned on, and the second light-emitting diode L2 emits light. The rest of the structure is the same as that of the control and guidance function generating circuit in FIG3 and will not be repeated here.

[0089] It can be seen that in this embodiment, the diode is turned on and off directly through the high and low levels input by the first control and guidance function signal source and the second control and guidance function signal source, which can save component costs and simplify the circuit.

[0090] In one possible embodiment, please refer to FIG. 7 , which is a schematic diagram of the structure of another control and guidance function generating circuit provided in an embodiment of the present application. FIG. 7 is further derived from FIG. Based on FIG. 3 , the control and guidance function generating circuit shown in FIG. 7 further includes: a first gallium nitride transistor F5 and a second gallium nitride transistor F6. The first gallium nitride transistor F5 replaces the first optical coupling field effect transistor F1 and the second optical coupling field effect transistor F2 in FIG. 3 , and the second gallium nitride transistor F6 replaces the third optical coupling field effect transistor F3 and the fourth optical coupling field effect transistor F4 in FIG. The drain of the first gallium nitride transistor F5 is connected to the second power supply V2, the source of the first gallium nitride transistor F5 is connected to the seventh resistor, the source of the second gallium nitride transistor F6 is connected to the third power supply V3, and the drain of the second gallium nitride transistor F6 is connected to one end of the eighth resistor. The remaining structure is the same as that of the control and guidance function generating circuit in FIG. These details will not be repeated here.

[0091] The first gallium nitride transistor F5 and the second gallium nitride transistor F6 may also be P-channel field effect transistors.

[0092] The first gallium nitride transistor F5 and the second gallium nitride transistor F6 have a bidirectional blocking function, that is, the drain-source of the first gallium nitride transistor F5 and the second gallium nitride transistor F6 have no parasitic body diodes. When no gate-source driving voltage is applied, external signals cannot flow into the first gallium nitride transistor F5 and the second gallium nitride transistor F6.

[0093] When the first control and steering function signal source CP+ generates a high-level signal, the first light-emitting diode L1 can emit light, and the gate of the first gallium nitride transistor F5 can receive the high-level signal. The current input by the second power supply V2 can flow from the drain of the first gallium nitride transistor F5 to the source, and the output terminal CP of the control and steering function generating circuit outputs the voltage input by the second power supply V2. If the second control and steering function signal source CP- inputs a low-level signal at this time, the second control submodule cannot form a closed loop, the second light-emitting diode L2 cannot conduct, and the second gallium nitride transistor F6 cannot conduct.

[0094] When the second control and steering function signal source CP- generates a high-level signal, the second light-emitting diode L2 can emit light. The gate of the second gallium nitride transistor F6 then receives a high-level signal, allowing current input from the third power supply V3 to flow from the drain to the source of the second gallium nitride transistor F6. The output terminal CP of the control and steering function generating circuit outputs the voltage input from the third power supply V3. If the first control and steering function signal source CP- inputs a low-level signal at this time, the first control submodule cannot form a closed loop, the first light-emitting diode L1 cannot conduct, and the first gallium nitride transistor F5 cannot conduct.

[0095] When both the first control and guidance function signal source CP+ and the second control and guidance function signal source CP- input the low-level signal, the second light-emitting diode L2 and the first light-emitting diode L1 are not turned on and cannot generate the electrical signal. Furthermore, the first gallium nitride transistor F5 and the second gallium nitride transistor F6 are not turned on, and the output terminal CP of the control and guidance function generating circuit cannot output a signal and is in a high-impedance state.

[0096] When the first control and steering function signal source CP+ generates a high-level signal, the first light-emitting diode L1 can emit light. Current input from the second power supply V2 can flow from the drain to the source of the first gallium nitride transistor F5, and after voltage division by the seventh resistor R7, reach the output terminal CP of the control and steering function generating circuit. The output terminal CP of the control and steering function generating circuit then outputs the voltage input from the second power supply V2. Simultaneously, when the second control and steering function signal source CP- generates a high-level signal, the second light-emitting diode L2 can emit light. Current input from the third power supply V3 can flow from the drain to the source of the second gallium nitride transistor F6, and after voltage division by the eighth resistor R8, reach the output terminal CP of the control and steering function generating circuit. The output terminal CP of the control and steering function generating circuit then outputs the voltage input from the other end of the third power supply V3. However, since the voltages at the two levels of the power supply are opposite and the current always flows from the positive pole to the negative pole, the current flow can be from the second power supply V2 to the third power supply V3, and the two ends of the output end CP of the control and guidance function generating circuit have a symmetrical structure, and the seventh resistor R7 and the eighth resistor R8 are the same, so 0V is output at the output end CP of the control and guidance function generating circuit.

[0097] It can be seen that in this embodiment, by using the first gallium nitride transistor F5 and the second gallium nitride transistor F6, one gallium nitride transistor can replace a group of back-to-back transistors, which can make the circuit simpler and save costs.

[0098] In one possible embodiment, please refer to FIG8 , which is a schematic diagram of the structure of another control and guidance function generating circuit provided in an embodiment of the present application. FIG8 is further obtained based on FIG3 . Based on FIG3 , the control and guidance function generating circuit shown in FIG8 places the seventh resistor R7 in a state connected to one end of the power supply, and the other end of the seventh resistor R7 is connected to the first optical coupling field effect transistor F1. The eighth resistor R8 is placed in a state connected to the other end of the power supply, and the other end of the eighth resistor R8 is connected to the fourth optical coupling field effect transistor F4. The rest of the structure is the same as that of FIG3 and will not be described in detail here.

[0099] It can be seen that in this embodiment, the driving level conversion circuit can be omitted, the circuit can be simplified to reduce costs, the number of components can be reduced, and reliability can be improved. The optical coupling module can simultaneously realize the two functions of generating a control guidance function signal and completely disconnecting the control guidance function generating circuit, which can achieve a small number of components, a simple circuit, a small volume, low cost, and high reliability to a large extent. It should be noted that for the aforementioned application implementation methods, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should know that this application is not limited by the described order of actions, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the implementation methods described in the specification are all optional implementation methods, and the actions and modules involved are not necessarily required for this application.

[0100] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0102] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or in the form of software program modules.

[0103] If the integrated unit is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a memory and includes a number of instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned memory includes various media that can store program codes, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0104] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable memory, which may include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0105] The above is a detailed introduction to the implementation methods of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above implementation methods is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A control and guidance function generating circuit, characterized in that: include: A control module, comprising a plurality of control submodules, wherein the plurality of control submodules are connected in parallel, and each of the control submodules comprises a light emitting diode; An optical coupling module, comprising a plurality of optical coupling sub-modules, wherein the plurality of optical coupling sub-modules are connected in parallel, and each of the optical coupling sub-modules comprises an optical coupling field effect transistor; Each of the optical coupling sub-modules receives an electrical signal from the control sub-module corresponding to the optical coupling sub-module through optical coupling isolation between the corresponding optical coupling field effect transistor and any of the light-emitting diodes, thereby conducting a path between the control module and the optical coupling module and generating a control and guidance function generation signal.

2. The control and guidance function generating circuit according to claim 1, characterized in that: The multiple control submodules include a first control submodule and a second control submodule, wherein the light emitting diode corresponding to the first control submodule is a first light emitting diode, and the light emitting diode corresponding to the second control submodule is a second light emitting diode.

3. The control and guidance function generating circuit according to claim 2, characterized in that: The first control submodule includes: a first transistor, a first resistor, a second resistor, a third resistor, and the first light-emitting diode; the second control submodule includes: a second transistor, a fourth resistor, a fifth resistor, a sixth resistor, and the second light-emitting diode; wherein, The first port of the first light emitting diode and the first port of the second light emitting diode are both connected to one end of a first power source; The second port of the first light-emitting diode is connected to the first port of the first resistor, the second port of the first resistor is connected to the collector of the first transistor, the base of the first transistor is connected to the first port of the second resistor and the first port of the third resistor, the second port of the third resistor is connected to the ground; the emitter of the first transistor is connected to the ground; The second port of the second light-emitting diode is connected to the first port of the fourth resistor, the other end of the fourth resistor is connected to the collector of the second transistor, the base of the second transistor is connected to the first port of the fifth resistor and the first port of the sixth resistor, the second port of the sixth resistor is connected to the ground; the emitter of the second transistor is connected to the ground.

4. The control and guidance function generating circuit according to claim 3, characterized in that: The control module also includes: a first control guidance function signal source and a second control guidance function signal source, wherein the first control guidance function signal source is connected to the second port of the second resistor, and the second control guidance function signal source is connected to the second port of the fifth resistor, and the first control guidance function signal source and the second control guidance function signal source are used to generate a high level signal or a low level signal.

5. The control and guidance function generating circuit according to claim 1, characterized in that: The multiple optical coupling sub-modules include a first optical coupling sub-module and a second optical coupling sub-module. The optical coupling field-effect transistors corresponding to the first optical coupling sub-module include: a first optical coupling field-effect transistor and a second optical coupling field-effect transistor. The optical coupling field-effect transistors corresponding to the second optical coupling sub-module include: a third optical coupling field-effect transistor and a fourth optical coupling field-effect transistor.

6. The control and guidance function generating circuit according to claim 5, characterized in that: The first optical coupling submodule includes: the first optical coupling field effect transistor, the second optical coupling field effect transistor, and a seventh resistor; the second optical coupling submodule includes: the third optical coupling field effect transistor, the fourth optical coupling field effect transistor, and an eighth resistor, wherein: The drain of the first optical coupling field effect transistor is connected to the port of the second power supply, the source of the first optical coupling field effect transistor is connected to the source of the second optical coupling field effect transistor, and the gate of the first optical coupling field effect transistor is connected to the gate of the second optical coupling field effect transistor; The drain of the second optical coupling field effect transistor is connected to the first port of the seventh resistor, and the second port of the seventh resistor is connected to the output end of the control and guidance function generating circuit; The drain of the third optical coupling field effect transistor is connected to the first port of the eighth resistor, and the second port of the eighth resistor is connected to the output end of the control and guidance function generating circuit; The source of the third optical coupling field effect transistor is connected to the source of the fourth optical coupling field effect transistor, the gate of the third optical coupling field effect transistor is connected to the gate of the fourth optical coupling field effect transistor, and the drain of the fourth optical coupling field effect transistor is connected to the port of the third power supply; The first optical coupling field effect transistor and the second optical coupling field effect transistor are connected to have a bidirectional isolation function; the third optical coupling field effect transistor and the fourth optical coupling field effect transistor are connected to have a bidirectional blocking function.

7. The control and guidance function generating circuit according to claim 6, characterized in that: When the first control and guidance function signal source generates the high-level signal and the second control and guidance function signal source generates the low-level signal, the first control submodule is turned on and the first light-emitting diode generates the electrical signal to conduct the path between the first optical coupling submodule and the first control submodule; and when the second control submodule is turned off and the second light-emitting diode is turned off, the path between the second optical coupling submodule and the second control submodule is not conducted; The output end of the control and guidance function generating circuit outputs a first control and guidance function generating signal, and the first control and guidance function generating signal is used to output the voltage input by the second power supply.

8. The control and guidance function generating circuit according to claim 6, characterized in that: When the first control and guidance function signal source generates the low-level signal and the second control and guidance function signal source inputs the high-level signal, the first control submodule is not turned on, the first light-emitting diode is not turned on, the first optical coupling submodule is not turned on, and the second control submodule is turned on, and the second light-emitting diode generates the electrical signal to conduct the path between the second optical coupling submodule and the second control submodule; The output end of the control and guidance function generating circuit outputs a second control and guidance function generating signal, and the second control and guidance function generating signal is used to output the voltage input by the third power supply.

9. The control and guidance function generating circuit according to claim 6, characterized in that: When the first control and guidance function signal source generates the low-level signal and the second control and guidance function signal source inputs the low-level signal, the second control submodule is not conductive, and when the first control submodule is not conductive, the second light-emitting diode and the first light-emitting diode are both not conductive and cannot generate the electrical signal, and the second optical coupling submodule and the first optical coupling submodule are both not conductive; The output end of the control and guidance function generating circuit is in a high impedance state.

10. The control and guidance function generating circuit according to claim 6, characterized in that: When the first control and guidance function signal source generates the high-level signal and the second control and guidance function signal source inputs the high-level signal, the second control submodule and the first control submodule are both turned on, and the second light-emitting diode and the first light-emitting diode both generate the electrical signal to conduct the path between the first optical coupling submodule and the first control submodule and the path between the second optical coupling submodule and the second control submodule, and the second optical coupling submodule and the first optical coupling submodule are both turned on; The output end of the control and guidance function generating circuit outputs 0V.

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