Interface circuit and control device
By introducing the first and second one-way conduction circuits into the interface circuit, the two-way conduction control of multiple logic control circuits is realized, which solves the problem that the existing interface circuit can only control one logic control circuit separately, and simplifies the circuit of the control device.
Patent Information
- Application Number
- CN202421522394.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2025-05-06
- Estimated Expiration
- 2034-06-28
AI Technical Summary
The existing interface circuit can only control the state of one logic control circuit, which results in the control device that needs to set up multiple interface circuits when it is necessary to control multiple logic control circuits, resulting in complex circuits.
An interface circuit is provided, including a first one-way conducting circuit and a second one-way conducting circuit, through which two-way conducting control of a plurality of logic control circuits is realized.
Through one interface circuit, a plurality of logic control circuits can be controlled in a state, simplifying the circuit structure of the control device.
Smart Images
Figure CN222839663U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of circuit control technology, and in particular to an interface circuit and a control device. Background Art
[0002] The port of the control device is connected to the logic control circuit through the interface circuit to realize state control of the logic control circuit.
[0003] However, the existing interface circuit can only control the state of one logic control circuit. When the control device needs to control multiple logic control circuits, the control device needs to be equipped with multiple interface circuits, which makes the circuit of the control device complicated. Utility Model Content
[0004] The main technical problem solved by the present application is to provide an interface circuit and a control device, so that the interface circuit can conduct bidirectionally to control multiple logic control circuits and simplify the circuit of the control device.
[0005] In order to solve the above technical problems, the technical solution adopted in the present application is to provide an interface circuit, which includes: a first signal terminal and a second signal terminal; a first unidirectional conduction circuit, the input terminal of the first unidirectional conduction circuit is connected to the first signal terminal; a first control module, the output terminal of the first unidirectional conduction circuit is connected to one end of the first control module, and the other end of the first control module is connected to the second signal terminal; a second unidirectional conduction circuit, the input terminal of the second unidirectional conduction circuit is connected to the second signal terminal; a second control module, the output terminal of the second unidirectional conduction circuit is connected to one end of the second control module, and the other end of the second control module is connected to the first signal terminal.
[0006] In a possible implementation, the first control module includes a first photocoupler, a first end of a light source of the first photocoupler is connected to the first unidirectional conduction circuit, a second end of the light source is connected to the second signal end and an input end of the second unidirectional conduction circuit, a light receiver of the first photocoupler is connected to a first control circuit, and the first control circuit has a first control signal output end; the second control module includes a second photocoupler, a first end of a light source of the second photocoupler is connected to the second unidirectional conduction circuit, a second end of the light source is connected to the first signal end and an input end of the first unidirectional conduction circuit, a light receiver of the second photocoupler is connected to a second control circuit, and the second control circuit has a second control signal output end.
[0007] In a possible implementation, the interface circuit also includes: a first current limiting circuit, one end of the first current limiting circuit is connected to the first control module, and the other end of the first current limiting circuit is connected to the second signal end; a second current limiting circuit, one end of the second current limiting circuit is connected to the second control module, and the other end of the second current limiting circuit is connected to the first signal end.
[0008] In a possible implementation, the first current limiting circuit includes a first triode, a second triode, a first resistor and a second resistor; the collector of the first triode is connected to the second end of the light source of the first photocoupler, the emitter of the first triode is connected to the first end of the first resistor, the second end of the first resistor is connected to the second signal end, the first end of the second resistor is connected to the first end of the light source of the first photocoupler, the second end of the second resistor is connected to the base of the first triode and the collector of the second triode, the base of the second triode is connected to the emitter of the first triode, and the emitter of the second triode is connected to the a second signal terminal; the second current limiting circuit includes a third triode, a fourth triode, a third resistor and a fourth resistor; the collector of the third triode is connected to the second end of the light source of the second photoelectric coupler, the emitter of the third triode is connected to the first end of the third resistor, the second end of the third resistor is connected to the first signal terminal, the first end of the fourth resistor is connected to the first end of the light source of the second photoelectric coupler, the second end of the fourth resistor is connected to the base of the third triode and the collector of the fourth triode, the base of the fourth triode is connected to the emitter of the third triode, and the emitter of the fourth triode is connected to the first signal terminal.
[0009] In a possible implementation manner, the interface circuit further includes: a clamp circuit, one end of the clamp circuit is connected to the first signal end, and the other end of the clamp circuit is connected to the second signal end.
[0010] In a possible implementation, the first control circuit includes: a fifth transistor, the emitter of the fifth transistor is connected to the first control signal output terminal, the base of the fifth transistor is connected to the first end of the photoreceiver of the first photocoupler, and the collector of the fifth transistor is connected to the second end of the photoreceiver of the first photocoupler; the second control circuit includes: a power supply terminal, the power supply terminal is connected to the first end of the photoreceiver of the second photocoupler, and the second end of the photoreceiver of the second photocoupler is connected to the second control signal output terminal.
[0011] In a possible implementation manner, the first control circuit further includes an isolation circuit, one end of the isolation circuit is connected to the first control signal output end, and the other end of the isolation circuit is connected to the emitter of the fifth transistor.
[0012] In a possible implementation, the second control circuit further includes a filter circuit, one end of the filter circuit is connected to the second end of the light receiver of the second photocoupler, and the other end of the filter circuit is connected to the second control signal output end.
[0013] In a possible implementation, the first unidirectional conduction circuit includes a first diode, an input end of the first diode is connected to the first signal end, and an output end of the first diode is connected to the first control module; the second unidirectional conduction circuit includes a second diode, an input end of the second diode is connected to the second signal end, and an output end of the second diode is connected to the second control module.
[0014] In order to solve the above technical problems, another technical solution adopted in the present application is to provide a control device, which includes the interface circuit described in any one of the above items.
[0015] The beneficial effect of the present application is as follows: Different from the prior art, the present application provides an interface circuit and a control device, the interface circuit comprising a first unidirectional conduction circuit and a second unidirectional conduction circuit, the output end of the first unidirectional conduction circuit is connected to one end of the first control module, and the other end of the first control module is connected to the second signal end; the output end of the second unidirectional conduction circuit is connected to one end of the second control module, and the other end of the second control module is connected to the first signal end. The above-mentioned interface circuit can be bidirectionally conducted. When the input is positive, the signal can flow through the second unidirectional conduction circuit through the second signal end, and act on the second control module to generate a control signal to control the state of a logic control circuit. When the input is negative, the signal can flow through the first unidirectional conduction circuit through the first signal end, and act on the first control module to generate a control signal to control the state of another logic control circuit, so that the state of multiple logic control circuits can be controlled through one interface circuit, and the circuit of the control device can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0017] Figure 1 This is a schematic block diagram of the structure of an embodiment of the interface circuit of the present application;
[0018] Figure 2 for Figure 1 A schematic structural diagram of a specific implementation scheme of an interface circuit.
[0019] Among them, 100, interface circuit; 11, first signal terminal; 12, second signal terminal; 21, first unidirectional conduction circuit; 22, second unidirectional conduction circuit; 31, second control module; 32, first control module; U1, first photocoupler; U2, second photocoupler; V1, first control signal output terminal; V2, second control signal output terminal; 41, first current limiting circuit; 42, second current limiting circuit; Q1, first transistor; Q2, second transistor; Q3, third transistor; Q4, fourth transistor; Q5, fifth transistor; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; 50, clamping circuit; V3, power supply terminal; 60, isolation circuit. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0021] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "said", and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless otherwise clearly indicated above, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.
[0022] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.
[0023] It should be understood that the terms "include", "comprises" or any other variations used herein are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.
[0024] The existing interface circuit can only unidirectionally conduct and control a circuit of a logic control circuit, and the control device needs to be provided with multiple interface circuits, and the circuit of the control device is complicated.
[0025] Based on the above problems, the present application proposes an interface circuit and a control device; by setting a first unidirectional conduction circuit and a second unidirectional conduction circuit, when a positive input occurs, the signal flows through the second unidirectional conduction circuit, acting on the second control module to control the state of a logic control circuit; when a negative input occurs, the signal flows through the first unidirectional conduction circuit, acting on the first control module to control the state of another logic control circuit, which can effectively solve the above technical problems.
[0026] An interface circuit and a control device provided by the present application are described in detail below in conjunction with the accompanying drawings and embodiments.
[0027] This application provides an interface circuit. Figure 1 and Figure 2 , Figure 1 This is a schematic block diagram of the structure of an embodiment of the interface circuit of the present application; Figure 2 for Figure 1 Schematic diagram of a specific embodiment of an interface circuit. In some embodiments, the interface circuit 100 includes a first unidirectional conduction circuit 21 , a second unidirectional conduction circuit 22 , a first control module 32 and a second control module 31 .
[0028] The interface circuit 100 provided in the present application can be specifically used to be set in a control device, and the control device can be a control device in medical equipment, welding equipment, communication equipment and other equipment; wherein the control device can be connected to the logic control circuit through the interface circuit 100 set in the communication interface, USB (Universal Serial Bus) port and other interfaces, so that the control device can bidirectionally conduct and control multiple logic control circuits. Of course, in other embodiments, the interface circuit 100 can also be specifically set in any other reasonable electronic device that needs logic control, and this embodiment does not limit this.
[0029] The interface circuit 100 includes: a first signal terminal 11 and a second signal terminal 12; a first unidirectional conduction circuit 21, wherein the input terminal of the first unidirectional conduction circuit 21 is connected to the first signal terminal 11; a first control module 32, wherein the output terminal of the first unidirectional conduction circuit 21 is connected to one end of the first control module 32, and the other end of the first control module 32 is connected to the second signal terminal 12; a second unidirectional conduction circuit 22, wherein the input terminal of the second unidirectional conduction circuit 22 is connected to the second signal terminal 12; and a second control module 31, wherein the output terminal of the second unidirectional conduction circuit 22 is connected to one end of the second control module 31, and the other end of the second control module 31 is connected to the first signal terminal 11.
[0030] Specifically, the first signal terminal 11 and the second signal terminal 12 are used to input signals. In this embodiment, the interface circuit 100 transmits signals by differential signal transmission, wherein, in signal transmission, the second signal terminal 12 can be set to be a high level with respect to the first signal terminal 11, for example, the second signal terminal 12 is a high level signal terminal, and the first signal terminal 11 is a low level signal terminal. In this state, the interface circuit 100 can input signals from the second signal terminal 12. When the second signal terminal 12 is a low level signal terminal, and the first signal terminal 11 is a high level signal terminal, the interface circuit 100 can input signals from the first signal terminal 11 in this state.
[0031] The first control module 32 is used to connect a logic control circuit. When a signal is input from the first signal terminal 11, the signal enters the first control module 32 through the first unidirectional conduction circuit 21. At this time, the first control module 32 is turned on, and the first control module 32 generates a control signal to control the state of a logic control circuit. The second control module 31 is used to connect another logic control circuit. When a signal is input from the second signal terminal 12, the signal enters the second control module 31 through the second unidirectional conduction circuit 22. At this time, the second control module 31 is turned on, and the second control module 31 generates a control signal to control the state of another logic control circuit. In this embodiment, the first control module 32 and the second control module 31 may include a photocoupler, and a control circuit is set at one end of the photoreceiver of the photocoupler. When the signal passes through the first control module 32 or the second control module 31, the photocoupler is turned on, so that the control circuit at the photoreceiver end of the photocoupler is turned on to generate a control signal to control the state of the logic control circuit. In some other embodiments, the first control module 32 and the second control module 31 can also be set with other devices with switching characteristics such as transistors and current amplifiers to realize the function. The first unidirectional conduction circuit 21 and the second unidirectional conduction circuit 22 have unidirectional conduction characteristics, so that when the interface circuit 100 is at a high level at the second signal terminal 12 to the first signal terminal 11, after the signal is input from the second signal terminal 12, the first unidirectional conduction circuit 21 blocks the signal to avoid directly forming a short circuit and transmitting to the first signal terminal 11, but must pass through the second control module 31 to transmit to the first signal terminal 11 to form a loop. Similarly, when the interface circuit 100 is at a high level at the first signal terminal 11 to the second signal terminal 12, after the signal is input from the first signal terminal 11, the second unidirectional conduction circuit 22 blocks the signal to avoid directly forming a short circuit and transmitting to the second signal terminal 12, but must pass through the first control module 32 to transmit to the second signal terminal 12 to form a loop. In this embodiment, the first unidirectional conduction circuit 21 and the second unidirectional conduction circuit 22 include diodes, and the function is realized by the unidirectional conduction of the diodes. In some other embodiments, the first unidirectional conduction circuit 21 and the second unidirectional conduction circuit 22 can also be realized by setting other devices such as transistors and photoelectric couplers.
[0032] Different from the prior art, the present application provides an interface circuit 100, which includes a first unidirectional conduction circuit 21 and a second unidirectional conduction circuit 22. The output end of the first unidirectional conduction circuit 21 is connected to one end of the first control module 32, and the other end of the first control module 32 is connected to the second signal end 12; the output end of the second unidirectional conduction circuit 22 is connected to one end of the second control module 31, and the other end of the second control module 31 is connected to the first signal end 11. The above-mentioned interface circuit 100 can be bidirectionally conducted. When the interface circuit 100 is positively input, the signal can flow through the second unidirectional conduction circuit 22 through the second signal end 12, and act on the second control module 31 to generate a control signal to control the state of a logic control circuit. When the interface circuit 100 is negatively input, the signal can flow through the first unidirectional conduction circuit 21 through the first signal end 11, and act on the first control module 32 to generate a control signal to control the state of another logic control circuit, so that the state of multiple logic control circuits can be controlled through one interface circuit 100, and the circuit of the control device can be simplified.
[0033] The first control module 32 includes a first photocoupler U1, a first end of the light source (not marked) of the first photocoupler U1 is connected to the first unidirectional conduction circuit 21, a second end of the light source is connected to the second signal terminal 12 and the input end of the second unidirectional conduction circuit 22, a light receiver (not marked) of the first photocoupler U1 is connected to the first control circuit, and the first control circuit has a first control signal output terminal V1; the second control module 31 includes a second photocoupler U2, a first end of the light source of the second photocoupler U2 is connected to the second unidirectional conduction circuit 22, a second end of the light source is connected to the first signal terminal 11 and the input end of the first unidirectional conduction circuit 21, a light receiver of the second photocoupler U2 is connected to the second control circuit, and the second control circuit has a second control signal output terminal V2. Specifically, the first photocoupler U1 and the second photocoupler U2 also have the characteristic of unidirectional signal transmission, so that the signal entering from the first signal terminal 11 can only enter the first unidirectional conduction circuit 21, avoiding the signal entering from the first signal terminal 11 directly entering the second photocoupler U2; similarly, the signal entering from the second signal terminal 12 can only enter the second unidirectional conduction circuit 22, avoiding the signal entering from the second signal terminal 12 directly entering the first photocoupler U1. In some other embodiments, the first photocoupler U1 and the second photocoupler U2 can also be realized by other devices with switching characteristics such as transistors and current amplifiers.
[0034] In this embodiment, the interface circuit 100 further includes a first current limiting circuit 41 and a second current limiting circuit 42. One end of the first current limiting circuit 41 is connected to the first control module 32, and the other end of the first current limiting circuit 41 is connected to the second signal terminal 12; the second current limiting circuit 42, one end of the second current limiting circuit 42 is connected to the second control module 31, and the other end of the second current limiting circuit 42 is connected to the first signal terminal 11. Specifically, the light source of the first photocoupler U1 and the second photocoupler U2 is at a greater risk of damage when the current exceeds the rated value. By setting the first current limiting circuit 41 and the second current limiting circuit 42 to limit the current flowing through the light source of the first photocoupler U1 and the second photocoupler U2, the first photocoupler U1 and the second photocoupler U2 are protected. Among them, the current limiting circuit can be a current limiting circuit based on a triode, or a current limiting circuit based on a transistor, and the type of the current limiting circuit is not specifically limited.
[0035] Furthermore, in the present embodiment, the first current limiting circuit 41 includes a first transistor Q1, a second transistor Q2, a first resistor R1 and a second resistor R2; the collector (not marked) of the first transistor Q1 is connected to the second end of the light source of the first photocoupler U1, the emitter (not marked) of the first transistor Q1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the second signal terminal 12, the first end of the second resistor R2 is connected to the first end of the light source of the first photocoupler U1, the second end of the second resistor R2 is connected to the base (not marked) of the first transistor Q1 and the collector of the second transistor Q2, the base of the second transistor Q2 is connected to the emitter of the first transistor Q1, and the emitter of the second transistor Q2 is connected to the second signal terminal 12. Specifically, in the first current limiting circuit 41, the first transistor Q1 is used as a main control transistor, the second transistor Q2 is used as a comparison transistor, the first resistor R1 is connected in series in the output loop of the light source of the first photocoupler U1, the first resistor R1 is used to detect the current flowing through the light source, and the second end of the second resistor R2 is connected between the base of the first transistor Q1 and the collector of the second transistor Q2 to form a negative feedback path. When the light source of the first photocoupler U1 is working normally, the current is within a safe range, and the voltage drop generated by the current flowing through the first resistor R1 is small. The voltage drop is fed back to the base of the first transistor Q1 through the second resistor R2, so that the first transistor Q1 maintains a cut-off or slightly turned-on state, and does not affect the current passing. When the current flowing through the light source of the first photocoupler U1 is too large, the voltage drop on the first resistor R1 increases, and the increased voltage is fed back to the base of the second triode Q2 through the second resistor R2, resulting in an increase in the collector current of the second triode Q2 and a decrease in the collector voltage of the second triode Q2. After the voltage of the collector of the second triode Q2 decreases, it is fed back to the base of the first triode Q1 through the second resistor R2, so that the base-emitter voltage of the first triode Q1 increases, and the first triode Q1 enters the on state. After the first triode Q1 is turned on, the resistance from the collector to the emitter decreases, which is equivalent to introducing a low impedance path at the second end of the light source of the first photocoupler U1, thereby limiting the current flowing through the light source. In this embodiment, the first transistor Q1 and the second transistor Q2 are both NPN type transistors, and the first current limiting circuit 41 is a current limiting circuit composed of NPN type transistors. In some other embodiments, the first current limiting circuit 41 can also be a current limiting circuit composed of PNP type transistors, or the first current limiting circuit 41 can also be other types of current limiting circuits, without specific limitation.
[0036] In the present embodiment, the second current limiting circuit 42 includes a third triode Q3, a fourth triode Q4, a third resistor R3 and a fourth resistor R4; the collector of the third triode Q3 is connected to the second end of the light source of the second photocoupler U2, the emitter of the third triode Q3 is connected to the first end of the third resistor R3, the second end of the third resistor R3 is connected to the first signal end 11, the first end of the fourth resistor R4 is connected to the first end of the light source of the second photocoupler U2, the second end of the fourth resistor R4 is connected to the base of the third triode Q3 and the collector of the fourth triode Q4, the base of the fourth triode Q4 is connected to the emitter of the third triode Q3, and the emitter of the fourth triode Q4 is connected to the first signal end 11. Specifically, the composition and principle of the second current limiting circuit 42 in the present embodiment are the same as those of the first current limiting circuit 41, which will not be repeated here. In addition, the second current limiting circuit 42 can also be other types of current limiting circuits, which are not specifically limited.
[0037] In this embodiment, the interface circuit 100 further includes a clamp circuit 50, one end of the clamp circuit 50 is connected to the first signal terminal 11, and the other end of the clamp circuit 50 is connected to the second signal terminal 12. Specifically, in this embodiment, the clamp circuit 50 is a bidirectional clamp circuit 50, and the bidirectional clamp circuit 50 includes a bidirectional breakdown diode (not shown), which is used to protect the stability of signal transmission and prevent the circuit from being affected by overvoltage shock.
[0038] In some embodiments, the first control circuit includes: a fifth transistor Q5, the emitter of the fifth transistor Q5 is connected to the first control signal output terminal V1, the base of the fifth transistor Q5 is connected to the first end of the light receiver of the first photocoupler U1, and the collector of the fifth transistor Q5 is connected to the second end of the light receiver of the first photocoupler U1; the second control circuit includes: a power supply terminal V3, the power supply terminal V3 is connected to the first end of the light receiver of the second photocoupler U2, and the second end of the light receiver of the second photocoupler U2 is connected to the second control signal output terminal V2. Specifically, the fifth transistor Q5 is a PNP transistor. When the level of the first signal terminal 11 is higher than the level of the second signal terminal 12, and the signal enters the interface circuit 100 from the first terminal, the light receiver of the first photocoupler U1 is turned on, so that the current flows through the light receiver of the first photocoupler U1, so that the base potential of the fifth transistor Q5 is higher than the emitter potential, and the fifth transistor Q5 is turned on, thereby lowering the potential of the first control signal output terminal V1 as a control signal to control the state of a logic control circuit. When the level of the second signal terminal 12 is higher than the level of the first signal terminal 11, and the signal enters the interface circuit 100 from the second terminal, the light receiver of the second photocoupler U2 is turned on, and the power supply terminal V3 is supplied to the second control signal output terminal V2 as a control signal to control the state of another logic control circuit after passing through the light receiver.
[0039] In some embodiments, the first control circuit further includes an isolation circuit 60, one end of the isolation circuit 60 is connected to the first control signal output terminal V1, and the other end of the isolation circuit 60 is connected to the emitter of the fifth transistor Q5. The second control circuit further includes a filter circuit (not shown), one end of the filter circuit is connected to the second end of the light receiver of the second photocoupler U2, and the other end of the filter circuit is connected to the second control signal output terminal V2. Specifically, in this embodiment, the isolation circuit 60 plays a role in isolating noise and resisting interference. In this embodiment, the isolation circuit 60 is composed of a diode device. In some other embodiments, the isolation circuit 60 can also be an isolation circuit 60 composed of other components such as a transformer and a magnetic coupler.
[0040] In the present embodiment, the first unidirectional conduction circuit 21 includes a first diode, the input end of the first diode is connected to the first signal end 11, and the output end of the first diode is connected to the first control module 32; the second unidirectional conduction circuit 22 includes a second diode, the input end of the second diode is connected to the second signal end 12, and the output end of the second diode is connected to the second control module 31. Specifically, in the present embodiment, the first unidirectional conduction circuit 21 and the second unidirectional conduction circuit 22 include diodes, and the function is realized by the unidirectional conduction property of the diodes. In some other embodiments, the first unidirectional conduction circuit 21 and the second unidirectional conduction circuit 22 can also be realized by setting other devices such as transistors and photoelectric couplers.
[0041] Different from the prior art, the present application provides an interface circuit 100, which includes a first unidirectional conduction circuit 21 and a second unidirectional conduction circuit 22. The output end of the first unidirectional conduction circuit 21 is connected to one end of the first control module 32, and the other end of the first control module 32 is connected to the second signal end 12; the output end of the second unidirectional conduction circuit 22 is connected to one end of the second control module 31, and the other end of the second control module 31 is connected to the first signal end 11. The above-mentioned interface circuit 100 can be bidirectionally conducted. When the interface circuit 100 is positively input, the signal can flow through the second unidirectional conduction circuit 22 through the second signal end 12, and act on the second control module 31 to generate a control signal to control the state of a logic control circuit. When the interface circuit 100 is negatively input, the signal can flow through the first unidirectional conduction circuit 21 through the first signal end 11, and act on the first control module 32 to generate a control signal to control the state of another logic control circuit, so that the state of multiple logic control circuits can be controlled through one interface circuit 100, and the circuit of the control device can be simplified.
[0042] Correspondingly, the present application also proposes a control device, which includes the interface circuit described in any of the above embodiments.
[0043] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent principle transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. An interface circuit, characterized in that: The interface circuit comprises: A first signal terminal and a second signal terminal; a first unidirectional conducting circuit, wherein an input end of the first unidirectional conducting circuit is connected to the first signal end; a first control module, wherein the output end of the first unidirectional conduction circuit is connected to one end of the first control module, and the other end of the first control module is connected to the second signal end; a second unidirectional conducting circuit, wherein an input end of the second unidirectional conducting circuit is connected to the second signal end; A second control module, wherein the output end of the second unidirectional conducting circuit is connected to one end of the second control module, and the other end of the second control module is connected to the first signal end.
2. The interface circuit according to claim 1, characterized in that: The first control module comprises a first photoelectric coupler, a first end of a light source of the first photoelectric coupler is connected to the first unidirectional conduction circuit, a second end of the light source is connected to the second signal end and an input end of the second unidirectional conduction circuit, a light receiver of the first photoelectric coupler is connected to a first control circuit, and the first control circuit has a first control signal output end; The second control module includes a second photoelectric coupler, a first end of the light source of the second photoelectric coupler is connected to the second unidirectional conduction circuit, a second end of the light source is connected to the first signal end and the input end of the first unidirectional conduction circuit, a light receiver of the second photoelectric coupler is connected to a second control circuit, and the second control circuit has a second control signal output end.
3. The interface circuit according to claim 2, characterized in that: The interface circuit also includes: A first current limiting circuit, wherein one end of the first current limiting circuit is connected to the first control module, and the other end of the first current limiting circuit is connected to the second signal end; A second current limiting circuit, wherein one end of the second current limiting circuit is connected to the second control module, and the other end of the second current limiting circuit is connected to the first signal end.
4. The interface circuit according to claim 3, characterized in that: The first current limiting circuit includes a first triode, a second triode, a first resistor and a second resistor; the collector of the first triode is connected to the second end of the light source of the first photocoupler, the emitter of the first triode is connected to the first end of the first resistor, the second end of the first resistor is connected to the second signal end, the first end of the second resistor is connected to the first end of the light source of the first photocoupler, the second end of the second resistor is connected to the base of the first triode and the collector of the second triode, the base of the second triode is connected to the emitter of the first triode, and the emitter of the second triode is connected to the second signal end; The second current limiting circuit includes a third triode, a fourth triode, a third resistor and a fourth resistor; the collector of the third triode is connected to the second end of the light source of the second photoelectric coupler, the emitter of the third triode is connected to the first end of the third resistor, the second end of the third resistor is connected to the first signal end, the first end of the fourth resistor is connected to the first end of the light source of the second photoelectric coupler, the second end of the fourth resistor is connected to the base of the third triode and the collector of the fourth triode, the base of the fourth triode is connected to the emitter of the third triode, and the emitter of the fourth triode is connected to the first signal end.
5. The interface circuit according to claim 2, characterized in that: The interface circuit also includes: A clamp circuit, one end of the clamp circuit is connected to the first signal end, and the other end of the clamp circuit is connected to the second signal end.
6. The interface circuit according to claim 2, characterized in that: The first control circuit comprises: a fifth transistor, the emitter of the fifth transistor is connected to the first control signal output terminal, the base of the fifth transistor is connected to the first end of the light receiver of the first photocoupler, and the collector of the fifth transistor is connected to the second end of the light receiver of the first photocoupler; The second control circuit includes: a power supply end, the power supply end is connected to a first end of a light receiver of the second photoelectric coupler, and a second end of the light receiver of the second photoelectric coupler is connected to the second control signal output end.
7. The interface circuit according to claim 6, characterized in that: The first control circuit further includes an isolation circuit, one end of the isolation circuit is connected to the first control signal output end, and the other end of the isolation circuit is connected to the emitter of the fifth transistor.
8. The interface circuit according to claim 6, characterized in that: The second control circuit further includes a filter circuit, one end of which is connected to the second end of the light receiver of the second photocoupler, and the other end of which is connected to the second control signal output end.
9. The interface circuit according to claim 1, characterized in that: The first unidirectional conducting circuit comprises a first diode, an input end of the first diode is connected to the first signal end, and an output end of the first diode is connected to the first control module; The second unidirectional conduction circuit includes a second diode, an input end of the second diode is connected to the second signal end, and an output end of the second diode is connected to the second control module.
10. A control device, characterized in that: The control device comprises the interface circuit according to any one of claims 1-9.