CN111198522B - Interface circuit including multiple output types and control method thereof - Google Patents
Interface circuit including multiple output types and control method thereof Download PDFInfo
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- CN111198522B CN111198522B CN201911188838.7A CN201911188838A CN111198522B CN 111198522 B CN111198522 B CN 111198522B CN 201911188838 A CN201911188838 A CN 201911188838A CN 111198522 B CN111198522 B CN 111198522B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
Abstract
The invention discloses an interface circuit containing multiple output types and a control method thereof, wherein the interface circuit comprises an MCU module, an output module, a selection module and a controller, the MCU module is connected with the selection module and the output module, the output module is connected with the selection module, the selection module is connected with the controller XS, and the output module comprises a conversion circuit and/or a conditioning circuit. According to the invention, by arranging the MCU module, the output module, the selection module and the controller, the MCU module is connected with the selection module and the output module, the output module is connected with the selection module, the selection module is connected with the controller, and the output module comprises the conversion circuit and/or the conditioning circuit, so that the controller can support various control modes under the condition of no change, convenience is brought, the cost for replacing the controller is reduced, and the controller can be widely applied to the technical field of output control.
Description
Technical Field
The invention relates to the technical field of output control, in particular to an interface circuit comprising multiple output types and a control method thereof.
Background
The field actuators are diversified in types, and relate to various modes such as voltage output control, current control or switching value control, the actuators are generally connected with a controller and controlled by the controller, the types of output interfaces of the existing controller are fixed, and generally each interface of the controller can only control one type of actuator, namely, the actuators are controlled by voltage output, current or switching value, so that when the field actuators need to be changed or different types need to be added, the actuators of other types need to be replaced, namely, the controllers need to be replaced so as to match the interfaces of the actuators, which is very troublesome.
Disclosure of Invention
To solve the above technical problems, the present invention aims to: a convenient interface circuit including a plurality of output types and a control method thereof are provided.
The technical scheme adopted by the invention is as follows: the interface circuit comprises an MCU module, an output module, a selection module and a controller, wherein the MCU module is connected with the selection module and the output module, the output module is connected with the selection module, the selection module is connected with the controller, and the output module comprises a conversion circuit and/or a conditioning circuit.
Further, the MCU module comprises an MCU and an output circuit, the output circuit comprises a first operational amplifier, a first resistor and a second resistor, the non-inverting input end of the first operational amplifier is connected with the MCU, the two ends of the first resistor are respectively grounded and connected with the inverting input end of the first operational amplifier, and the two ends of the second resistor are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier.
Furthermore, the conversion circuit comprises a second operational amplifier, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor, wherein two ends of the third resistor are respectively connected with the output end of the first operational amplifier and the non-inverting input end of the second operational amplifier, two ends of the fourth resistor are respectively grounded and connected with the inverting input end of the second operational amplifier, two ends of the fifth resistor are respectively connected with the inverting input end of the second operational amplifier and the output end of the second operational amplifier, two ends of the sixth resistor are respectively connected with the output end of the second operational amplifier and the non-inverting input end of the third operational amplifier, one end of the seventh resistor is connected with the non-inverting input end of the second operational amplifier, and the other end of the seventh resistor is respectively connected with the inverting input end and the output end of the third operational amplifier;
the selection module comprises a first triode and a first relay, the base electrode of the first triode is connected with the MCU, the emitting electrode of the first triode is grounded, and the first relay is respectively connected with the collecting electrode of the first triode, the non-inverting input end of the third operational amplifier and the controller.
Further, the selection module comprises a third triode and a third relay, the base electrode of the third triode is connected with the MCU, the emitting electrode of the third triode is grounded, and the third relay is respectively connected with the collector electrode of the third triode and the controller.
Furthermore, the conditioning circuit comprises a fourth operational amplifier, an eighth resistor and a ninth resistor, wherein two ends of the eighth resistor are respectively connected with the positive electrode of the power supply and the inverting input end of the fourth operational amplifier, two ends of the ninth resistor are respectively grounded and connected with the inverting input end of the fourth operational amplifier, the non-inverting input end of the fourth operational amplifier is connected with the output end of the first operational amplifier, and the inverting input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier;
the selection module comprises a second triode and a second relay, the base electrode of the second triode is connected with the MCU, the emitting electrode of the second triode is grounded, and the second relay is respectively connected with the collector electrode of the second triode, the output end of the fourth operational amplifier and the controller.
Furthermore, the conditioning circuit further includes a tenth resistor, an eleventh resistor, a twelfth resistor, and a thirteenth resistor, wherein the non-inverting input terminal of the fourth operational amplifier is connected to the output terminal of the first operational amplifier through the tenth resistor, two ends of the eleventh resistor are respectively connected to the ground and the non-inverting input terminal of the fourth operational amplifier, one end of the eighth resistor is connected to the inverting input terminal of the fourth operational amplifier through the twelfth resistor, and the inverting input terminal of the fourth operational amplifier is connected to the output terminal of the fourth operational amplifier through the thirteenth resistor.
Further, the selection module comprises a third triode and a third relay, the base electrode of the third triode is connected with the MCU, the emitting electrode of the third triode is grounded, and the third relay is respectively connected with the collector electrode of the third triode and the controller.
Further, the MCU module comprises an MCU;
the selection module comprises a third triode and a third relay, the base electrode of the third triode is connected with the MCU, the emitting electrode of the third triode is grounded, and the third relay is respectively connected with the collector electrode of the third triode and the controller.
The invention also provides a control method of an interface circuit containing multiple output types, which comprises the following steps:
receiving driving information through the MCU module;
outputting a control signal to the controller through the selection module according to the driving information, or outputting the control signal to the controller through the output module and the selection module;
the output module comprises a conversion circuit and/or a conditioning circuit.
Further, the control signal includes a switching value, a voltage signal and a current signal.
The invention has the beneficial effects that: through setting up MCU module, output module, selection module, controller, the MCU module with the selection module the output module is connected, output module with the selection module is connected, the selection module with the controller is connected, output module includes converting circuit and/or modulate circuit for the controller can support multiple control mode under the condition of not changing, and the cost that needs more the controller has just been reduced to the convenience.
Drawings
Fig. 1 is a circuit configuration diagram of the present invention.
Detailed Description
The invention will be further explained and explained with reference to the drawings and the embodiments in the description.
Referring to fig. 1, an embodiment of the present invention provides an interface circuit including multiple output types, including an MCU module, an output module, a selection module, and a controller XS, where the MCU module is connected to the selection module and the output module, the output module is connected to the selection module, the selection module is connected to the controller XS, and the output module includes a conversion circuit and/or a conditioning circuit.
In this embodiment, the output module includes a conversion circuit and a conditioning circuit, which cooperate with the selection module to provide three control modes, and in other embodiments, the output module may include a conversion circuit or a conditioning circuit, which cooperate with the selection module to provide two control modes. The conversion circuit realizes the conversion between voltage and current, and the conditioning circuit realizes the conditioning of the voltage signal. The controller XSXS is a two-core socket of type S8050, and has 1 pin and 2 pins, and is used for being connected to a control quantity input interface of an external actuator to realize control.
Referring to fig. 1, in this embodiment, the MCU module includes an MCU and an output circuit, the output circuit includes a first operational amplifier U1A, a first resistor R1 and a first resistor R2, a non-inverting input terminal of the first operational amplifier U1A is connected to the MCU, two ends of the first resistor R1 are respectively grounded and connected to an inverting input terminal of the first operational amplifier U1A, and two ends of the first resistor R2 are respectively connected to an inverting input terminal of the first operational amplifier U1A and an output terminal of the first operational amplifier U1A. The first resistor R1 and the first resistor R2 are 10 k. The output circuit and the MCU form an in-phase proportional amplification circuit, the MCU is an STM32F103RTC6 chip, the MCU outputs an analog voltage signal U0 to the output circuit from a DA1_ OUT pin through a self-contained D/A converter, and the output end of the first operational amplifier U1A outputs a voltage signal U1.
Referring to fig. 1, in the present embodiment, the conversion circuit includes a second operational amplifier U1B, a third operational amplifier U1C, a third resistor R3, and a fourth resistor R4, the two ends of a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7 are respectively connected with the output end of the first operational amplifier U1A and the non-inverting input end of the second operational amplifier U1B, the two ends of a fourth resistor R4 are respectively connected with the ground and the inverting input end of the second operational amplifier U1B, the two ends of a fifth resistor R5 are respectively connected with the inverting input end of the second operational amplifier U1B and the output end of the second operational amplifier U1B, the two ends of a sixth resistor R6 are respectively connected with the output end of the second operational amplifier U1B and the non-inverting input end of the third operational amplifier U1C, one end of a seventh resistor R7 is connected with the non-inverting input end of the second operational amplifier U1B, and the other end of the seventh resistor R7 is respectively connected with the inverting input end and the output end of the third operational amplifier U1C. The size of the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the seventh resistor R7 is 100k ohms, and the size of the sixth resistor R6 is 200k ohms. The second operational amplifier U1B constitutes a non-inverting adder, the third operational amplifier U1C constitutes a voltage follower, the voltage at the output terminal of the second operational amplifier U1B is U2, and the voltage at the non-inverting input terminal of the third operational amplifier U1C is U3.
Referring to fig. 1, in this embodiment, the conditioning circuit includes a fourth operational amplifier U1D, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, an eighth resistor R8 having two ends respectively connected to the positive electrode of the power supply and the inverting input terminal of the fourth operational amplifier U1D, a ninth resistor R9 having two ends respectively connected to ground and the inverting input terminal of the fourth operational amplifier U1D, a non-inverting input terminal of the fourth operational amplifier U1D connected to the output terminal of the first operational amplifier U1A, an inverting input terminal of the fourth operational amplifier U1D connected to the output terminal of the fourth operational amplifier U1D, a non-inverting input terminal of the fourth operational amplifier U1D connected to the output terminal of the first operational amplifier U1A through a tenth resistor R10, two ends respectively connected to the non-inverting input terminal of the eleventh resistor R11 and the non-inverting input terminal of the fourth operational amplifier U1D, an eighth resistor R5928 connected to the inverting input terminal of the fourth operational amplifier U599, the inverting input terminal of the fourth operational amplifier U1D is connected to the output terminal of the fourth operational amplifier U1D through a thirteenth resistor R13. The size of the eighth resistor R8 is 1050 ohms, the size of the ninth resistor R9 is 200 ohms, the sizes of the tenth resistor R10 and the twelfth resistor R12 are 200k ohms, and the sizes of the eleventh resistor R11 and the thirteenth resistor R13 are 625k ohms. The tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12 and the thirteenth resistor R13 are all variable resistors. The fourth operational amplifier U1D constitutes a differential amplifier circuit, the voltage at the output end of the fourth operational amplifier U1D is U4, and the voltage obtained by dividing the voltage by the eighth resistor R8 and the ninth resistor R9 is U5.
Referring to fig. 1, in the present embodiment, the selection module includes a first transistor V1, a second transistor V2, a third transistor V3, a first relay K1, a second relay K2, and a third relay K3. The base electrode of the first triode V1 is connected with the PA0 pin of the MCU, the emitting electrode of the first triode V1 is grounded, and the first relay K1 is respectively connected with the collector electrode of the first triode V1, the non-inverting input end of the third operational amplifier U1C, and the pin 1 and the pin 2 of the controller XS; the base electrode of the second triode V2 is connected with the PA1 pin of the MCU, the emitting electrode of the second triode V2 is grounded, and the second relay K2 is respectively connected with the collector electrode of the second triode V2, the output end of the fourth operational amplifier U1D, and the pin 1 and the pin 2 of the controller XS; the base electrode of the third triode V3 is connected with the PA2 pin of the MCU, the emitting electrode of the third triode V3 is grounded, and the third relay K3 is respectively connected with the collector electrode of the third triode V3 and the pin 1 and the pin 2 of the controller XS. The first relay K1 and the second relay K2 are double-pole single-throw relays, and the third relay K3 is single-pole single-throw relays. The triode is an NPN tube.
Referring to fig. 1, in the present embodiment, the selection module further includes a first diode D1, a second diode D2, and a third diode D3, which are respectively connected to the first relay K1, the second relay K2, and the third relay K3, and are connected to a power supply positive electrode of 15V, so as to protect the three relays.
Referring to fig. 1, in this embodiment, the selection module further includes a fourteenth resistor R14, a fifteenth resistor R15, and a sixteenth resistor R16, the base of the first transistor V1 and the MCU are connected through the fourteenth resistor R14, the base of the second transistor V2 and the MCU are connected through the fifteenth resistor R15, and the base of the third transistor V3 and the MCU are connected through the sixteenth resistor R16.
Referring to fig. 1, in this embodiment, a water valve controller XS controlled by a voltage of 0 to 10V is taken as an example, when the control output opening is 50%, the output voltage should be 5V, if a water valve actuator controlled by a current of 4 to 20mA is replaced, a current of 12mA needs to be input, that is, a current of 12mA needs to be output automatically, where 4 to 20mA is an industrial standard signal, 4mA indicates that the opening is 0,20mA indicates that the opening is 100%, and other values correspond to each other according to a proportional relationship.
In this example, U2-U1 + U3 and U2-U3-I × R6 were obtained
I represents the current flowing through the sixth resistor R6, and when U1 is 0.8V, I is 4mA, and when U1 is 4V, I is 20mA, the requirement of 4 to 20mA output current is satisfied, that is, the converter circuit satisfies the requirement.
In the present embodiment, U0 ranges from 0.4v to 2v, U1 ranges from 0.8v to 4v, U5 is a 0.8v reference voltage,
it is found that U4 satisfies the requirement of 0v to 10v, i.e., the conditioning circuit satisfies the requirement.
The working principle is as follows:
1. when the external actuator needs current driving, namely conversion circuit output is needed, a PA0 pin of the MCU outputs high level, PA1 and PA2 pins are low level, only a first triode V1 is conducted, so that two contacts of a first relay K1 are closed, contacts of a second relay K2 and a third relay K3 are disconnected, and 4-20 mA current is output through a controller XS;
2. when the external actuator needs voltage driving, namely the output of a conditioning circuit is needed, the pin PA1 of the MCU outputs high level, the pins PA0 and PA2 are low level, only the second triode V2 is conducted, so that two contacts of the second relay K2 are closed, the contacts of the first relay K1 and the third relay K3 are disconnected, and 0-10V voltage is output through the controller XS;
3. when the external actuator is driven by the switching value, the pin PA2 of the MCU outputs high level, the pins PA1 and PA2 are low level, only the third triode V3 is switched on, so that two contacts of the third relay K3 are closed, the contacts of the first relay K1 and the second relay K2 are switched off, a contact closing signal is output through the controller XS, and the external actuator works;
4. when pins PA0, PA1 and PA2 are all in low level, the contacts of the first relay K1, the second relay K2 and the third relay K3 are all disconnected, and a contact disconnection signal is output through the controller XS, so that the external actuator is stopped.
Meanwhile, the invention also provides a control method of the interface circuit containing various output types, which comprises the following steps:
receiving driving information through the MCU module;
outputting a control signal to the controller through the selection module according to the driving information, or outputting the control signal to the controller through the output module and the selection module;
the output module comprises a conversion circuit and/or a conditioning circuit.
Further as a preferred embodiment, the control signal includes a switching quantity, a voltage signal and a current signal.
In this embodiment, the MCU module receives specific driving information required by the external actuator, and the MCU selects an output type according to the received driving information.
For example, when the driving information is the driving information requiring current signals, that is, the required control signals are current signals, the pin PA0 of the MCU outputs a high level, the pins PA1 and PA2 are low levels, and the first triode V1 of the selection module is controlled to be turned on, so that two contacts of the first relay K1 are closed, and contacts of the second relay K2 and the third relay K3 are opened, so that the conversion circuit outputs current signals to the controller, and the controller XS outputs 4 to 20mA current signals to the external actuator for control;
when the driving information is driven by the voltage signal, namely the required control signal is the voltage signal, the pin PA1 of the MCU outputs a high level, the pins PA0 and PA2 are low levels, the second triode V2 of the control selection module is switched on, so that two contacts of the second relay K2 are closed, the contacts of the first relay K1 and the third relay K3 are switched off, the conditioning circuit outputs the voltage signal to the controller, and the controller XS outputs a 0-10V voltage signal to the external actuator for control;
when the driving information is switching value driving, namely a required control signal is switching value, a pin PA2 of the MCU outputs high level, pins PA1 and PA2 are low level, a third triode V3 of the selection module is controlled to be switched on, so that two contacts of a third relay K3 are closed, contacts of a first relay K1 and a second relay K2 are switched off, namely, the switching value is directly output to the controller through the selection module, and a contact closing signal (switching value) is output through the controller XS to control the work of an external actuator.
In conclusion, the invention has the following beneficial effects:
1) the three control types are included simultaneously, and the type of the output signal can be selected according to the actual requirement;
2) when the external actuator is changed, the controller does not need to be replaced, so that the manual debugging time is reduced, convenience is realized, and the cost is reduced.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. An interface circuit comprising a plurality of output types, characterized by: the MCU module is connected with the selection module and the output module, the output module is connected with the selection module, the selection module is connected with the controller, and the output module comprises a conversion circuit and/or a conditioning circuit;
the MCU module comprises an MCU and an output circuit, the output circuit comprises a first operational amplifier, a first resistor and a second resistor, the non-inverting input end of the first operational amplifier is connected with the MCU, two ends of the first resistor are respectively grounded and connected with the inverting input end of the first operational amplifier, and two ends of the second resistor are respectively connected with the inverting input end of the first operational amplifier and the output end of the first operational amplifier;
the conversion circuit comprises a second operational amplifier, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor, wherein two ends of the third resistor are respectively connected with the output end of the first operational amplifier and the non-inverting input end of the second operational amplifier, two ends of the fourth resistor are respectively grounded and connected with the inverting input end of the second operational amplifier, two ends of the fifth resistor are respectively connected with the inverting input end of the second operational amplifier and the output end of the second operational amplifier, two ends of the sixth resistor are respectively connected with the output end of the second operational amplifier and the non-inverting input end of the third operational amplifier, one end of the seventh resistor is connected with the non-inverting input end of the second operational amplifier, and the other end of the seventh resistor is respectively connected with the inverting input end and the output end of the third operational amplifier;
the selection module comprises a first triode, a first relay, a second triode, a second relay, a third triode and a third relay, wherein the base electrode of the first triode is connected with the MCU, the emitting electrode of the first triode is grounded, the first relay is respectively connected with the collecting electrode of the first triode, the non-inverting input end of the third operational amplifier and the controller, the base electrode of the third triode is connected with the MCU, the emitting electrode of the third triode is grounded, the third relay is respectively connected with the collecting electrode of the third triode and the controller, the base electrode of the second triode is connected with the MCU, the emitting electrode of the second triode is grounded, and the second relay is respectively connected with the collecting electrode of the second triode, the output end of the fourth operational amplifier and the controller;
the conditioning circuit comprises a fourth operational amplifier, an eighth resistor and a ninth resistor, wherein two ends of the eighth resistor are respectively connected with the positive electrode of the power supply and the inverting input end of the fourth operational amplifier, two ends of the ninth resistor are respectively grounded and connected with the inverting input end of the fourth operational amplifier, the non-inverting input end of the fourth operational amplifier is connected with the output end of the first operational amplifier, and the inverting input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier; when the external actuator is driven by current, the MCU controls the first triode to be conducted, the first relay is closed, the second relay and the third relay are disconnected, and the current is output through the controller;
when the external actuator is driven by voltage, the MCU controls the second triode to be conducted, the second relay is closed, the first relay and the third relay are disconnected, and voltage is output through the controller;
when the external actuator is driven by the switching value, the MCU controls the third triode to be conducted, the third relay is closed, the first relay and the second relay are disconnected, the controller outputs a contact closing signal, and the external actuator works;
when the first relay, the second relay and the third relay are all disconnected, the contact disconnection signal is output through the controller, and the external actuator is stopped.
2. The interface circuit according to claim 1, comprising a plurality of output types, wherein: the conditioning circuit further comprises a tenth resistor, an eleventh resistor, a twelfth resistor and a thirteenth resistor, wherein the non-inverting input end of the fourth operational amplifier is connected with the output end of the first operational amplifier through the tenth resistor, two ends of the eleventh resistor are respectively grounded and the non-inverting input end of the fourth operational amplifier, one end of the eighth resistor is connected with the inverting input end of the fourth operational amplifier through the twelfth resistor, and the inverting input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier through the thirteenth resistor.
3. A control method for an interface circuit including a plurality of output types, which is applied to the interface circuit including a plurality of output types according to claim 1 or 2, comprising the steps of:
receiving driving information through the MCU module;
outputting a control signal to the controller through the selection module according to the driving information, or outputting the control signal to the controller through the output module and the selection module;
the output module comprises a conversion circuit and a conditioning circuit;
when the external actuator is driven by current, the MCU controls the first triode to be conducted, the first relay is closed, the second relay and the third relay are disconnected, and the current is output through the controller;
when the external actuator is driven by voltage, the MCU controls the second triode to be conducted, the second relay is closed, the first relay and the third relay are disconnected, and voltage is output through the controller;
when the external actuator is driven by the switching value, the MCU controls the third triode to be conducted, the third relay is closed, the first relay and the second relay are disconnected, the controller outputs a contact closing signal, and the external actuator works;
when the first relay, the second relay and the third relay are all disconnected, the contact disconnection signal is output through the controller, and the external actuator is stopped.
4. The method of claim 3, wherein the method further comprises: the control signals include a switching value, a voltage signal and a current signal.
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| CN114137865B (en) * | 2021-11-01 | 2024-03-19 | 上海美控智慧建筑有限公司 | Output control circuit, controller and air conditioner |
| CN115268558B (en) * | 2022-08-22 | 2024-03-22 | 苏州智而卓数字科技有限公司 | Universal output interface circuit for voltage and current |
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| CN104241024A (en) * | 2013-06-08 | 2014-12-24 | 天津克莱沃德科技有限公司 | Relay control circuit |
| CN205563343U (en) * | 2016-04-15 | 2016-09-07 | 深圳市汇辰自动化技术有限公司 | Analog quantity voltage current output circuit of low -cost high accuracy |
| WO2019148632A1 (en) * | 2018-02-05 | 2019-08-08 | 广东美的制冷设备有限公司 | Relay driving circuit and air conditioner |
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