CN212183116U - Communication switching circuit for microcomputer protection device/motor protection device - Google Patents
Communication switching circuit for microcomputer protection device/motor protection device Download PDFInfo
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- CN212183116U CN212183116U CN202021146053.1U CN202021146053U CN212183116U CN 212183116 U CN212183116 U CN 212183116U CN 202021146053 U CN202021146053 U CN 202021146053U CN 212183116 U CN212183116 U CN 212183116U
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- protection device
- electronic switch
- communication
- switching circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/14—Protecting elements, switches, relays or circuit breakers
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Abstract
The utility model relates to a communication switching circuit for a microcomputer protection device/a motor protection device, which comprises a pair of electronic switches; the pair of electronic switches is used for connecting the port of the first communication mode and the port of the second communication mode; the control ends of the pair of electronic switches are connected with the secondary side of an optical coupler; the primary side circuit of the optical coupler is connected with the IO port of the single chip microcomputer. The utility model has the advantages that: if the communication mode needs to be changed, only the state of the MCU OUT needs to be configured, and the circuit and software of the device can be solidified without being changed according to the requirements of customers; thereby reducing the difficulty of design and production and meeting the requirements of customers.
Description
Technical Field
The utility model relates to a computer protection device and motor protection device field, especially one kind are used for computer protection device or motor protection device communication switching circuit.
Background
Microcomputer protection devices, generally used in the field of relay protection, perform relay protection actions when a circuit fails; motor protectors are generally used to protect or alarm when various failures occur in a motor, for example, to cut off a power supply.
In practical projects, a problem is often encountered that some users require devices to satisfy one communication mode and other users require devices to satisfy another communication mode. And different communication modes relate to the support of hardware and software, and new requirements are provided for product design and production.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a communication switching circuit for satisfy above-mentioned requirement.
The scheme of the utility model is that:
a communication switching circuit for a microcomputer protection device/motor protection device includes a pair of electronic switches; the pair of electronic switches is used for connecting the port of the first communication mode and the port of the second communication mode; the control ends of the pair of electronic switches are connected with the secondary side of an optical coupler; the primary side circuit of the optical coupler is connected with the IO port of the single chip microcomputer.
Further, the pair of electronic switches comprises a first electronic switch and a second electronic switch, the first state of the first electronic switch is that the first end of the communication terminal is connected with CANH, and the other state is that the first end of the communication terminal is connected with RS 485A; one state of the second electronic switch is that the second end of the communication terminal is connected with CANL, and the other state is that the second end of the communication terminal is connected with RS 485B.
Furthermore, the control ends of the first electronic switch and the second electronic switch are both connected with the SW; SW is connected with the low potential end of the secondary side of the optical coupler device, and the high potential end of the secondary side of the optical coupler device is connected with a communication terminal power supply; the IO port of the single chip microcomputer is connected with the low-potential end of the primary side of the optocoupler, and the high-potential end of the primary side of the optocoupler is connected with the control power supply through a pull-up resistor.
Further, the first electronic switch and the second electronic switch are relays.
Furthermore, the first electronic switch and the second electronic switch are switching tubes.
The utility model has the advantages that: if the communication mode needs to be changed, only the state of the MCU OUT needs to be configured, and the circuit and software of the device can be solidified without being changed according to the requirements of customers; thereby reducing the difficulty of design and production and meeting the requirements of customers.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The following description is made with reference to the accompanying drawings.
Fig. 1 shows a schematic circuit diagram of the present invention.
Wherein, U1 is a switching device, comprising two electronic switches, one is DZ1, and the other is DZ 2; one state of the DZ1 switch is that the first end of the communication terminal (the end connected with the resistor RT 1) is connected with CANH, and the other state is that the first end of the communication terminal (the end connected with the resistor RT 1) is connected with RS 485A; one state of the DZ2 switch is that the second end of the communication terminal (one end of a connecting resistor RT 2) is connected with CANL, and the other state is that the second end of the communication terminal (one end of a connecting resistor RT 2) is connected with RS 485B; the control terminals of DZ1 and DZ2 are each connected to a SW terminal for controlling the switching of DZ1 and DZ2 between their respective two states.
U2 is an optical coupler, and a primary side circuit of the optical coupler comprises a control power supply VCC, a pull-up resistor R1, an optical coupler primary side and a single chip microcomputer control terminal MCU OUT; the secondary side circuit of the optical coupler device comprises a communication terminal power supply G5V, an optical coupler secondary side, a pull-down resistor R2 and a communication terminal power supply ground G5 VG. The low potential end of the secondary side of the optical coupler is connected with the SW terminal.
The MCU OUT is used for connecting an IO port of a singlechip (not shown in the figure).
The circuit principle is as follows: when the IO port MCU OUT of the singlechip outputs a high level, the primary side of the optocoupler is cut off, the secondary side SW terminal outputs a low level, and the DZ1 and the DZ2 are both in a first state, even if the first end of the communication terminal is connected with CANH, the second end is connected with CANL, and the device adopts a CAN communication mode. When the IO port MCU OUT of the singlechip outputs a low level, the primary side of the optocoupler is conducted, the secondary side SW outputs a high level, and the DZ1 and the DZ2 are both in a second state, even if the first end of the communication terminal is connected with the RS485A, the second end is connected with the RS485B, and the device adopts an RS485 communication mode.
Therefore, the communication mode of the device can be selected through the control of the IO port of the single chip microcomputer. The circuit and software of the device can be solidified without changing according to the customer requirements, and only the state of the MCU OUT needs to be configured, so that the difficulty of design and production is reduced, and the customer requirements are met.
In the above embodiment, U1 may be implemented by using a relay. In other embodiments, the switching device may be implemented by a transistor, a MOS transistor, or the like.
In the above embodiments, the CAN and RS485 communication is taken as an example for explanation, and as another embodiment, another type of serial communication method may be adopted.
The above is a preferred embodiment of the present invention, but it should be understood that the above detailed description should not be construed as limiting the spirit and scope of the present invention, and obvious modifications or substitutions made by those skilled in the art based on the above embodiment still belong to the protection scope of the present invention.
Claims (5)
1. A communication switching circuit for a microcomputer protection device/motor protection device is characterized by comprising a pair of electronic switches; the pair of electronic switches is used for connecting the port of the first communication mode and the port of the second communication mode; the control ends of the pair of electronic switches are connected with the secondary side of an optical coupler; the primary side circuit of the optical coupler is connected with the IO port of the single chip microcomputer.
2. The communication switching circuit for the microcomputer protection device/motor protection device according to claim 1, wherein the pair of electronic switches comprises a first electronic switch and a second electronic switch, the first electronic switch has a first state that the first end of the communication terminal is connected to CANH, and a second state that the first end of the communication terminal is connected to RS 485A; one state of the second electronic switch is that the second end of the communication terminal is connected with CANL, and the other state is that the second end of the communication terminal is connected with RS 485B.
3. The communication switching circuit for the microcomputer protection device/motor protection device according to claim 2, wherein the control terminals of the first electronic switch and the second electronic switch are connected to SW; SW is connected with the low potential end of the secondary side of the optical coupler device, and the high potential end of the secondary side of the optical coupler device is connected with a communication terminal power supply; the IO port of the single chip microcomputer is connected with the low-potential end of the primary side of the optocoupler, and the high-potential end of the primary side of the optocoupler is connected with the control power supply through a pull-up resistor.
4. The communication switching circuit for a microcomputer protection device/motor protection device according to claim 2 or 3, wherein the first electronic switch and the second electronic switch are relays.
5. The communication switching circuit for a microcomputer protection device/motor protection device according to claim 2 or 3, wherein the first electronic switch and the second electronic switch are switch tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021146053.1U CN212183116U (en) | 2020-06-19 | 2020-06-19 | Communication switching circuit for microcomputer protection device/motor protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021146053.1U CN212183116U (en) | 2020-06-19 | 2020-06-19 | Communication switching circuit for microcomputer protection device/motor protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212183116U true CN212183116U (en) | 2020-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021146053.1U Active CN212183116U (en) | 2020-06-19 | 2020-06-19 | Communication switching circuit for microcomputer protection device/motor protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212183116U (en) |
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2020
- 2020-06-19 CN CN202021146053.1U patent/CN212183116U/en active Active
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