CN214151427U - Control circuit - Google Patents
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- CN214151427U CN214151427U CN202023064066.7U CN202023064066U CN214151427U CN 214151427 U CN214151427 U CN 214151427U CN 202023064066 U CN202023064066 U CN 202023064066U CN 214151427 U CN214151427 U CN 214151427U
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Abstract
The utility model relates to a control circuit belongs to control circuit technical field. One end of the first isolator is connected with an input interface of the control circuit, and the other end of the first isolator is connected with an input pin of the controller; one end of the second isolator is connected with an output pin of the controller, and the other end of the second isolator is connected with an output interface of the control circuit through an output driver; one end of the third isolator is connected with the data communication interface of the controller, and the other end of the third isolator is connected with the communication interface chip; the communication interface chip is used for being connected with external equipment of the control circuit through a communication interface.
Description
Technical Field
The utility model relates to a control circuit technical field.
Background
The external interface of the control circuit comprises a communication interface and an input/output interface, is connected with external equipment through the communication interface, and carries out input/output of related control signals through the input/output interface.
The existing control circuit has no electrical isolation design on an external interface, and the condition that the whole hardware circuit is burnt due to input misoperation can often occur.
SUMMERY OF THE UTILITY MODEL
In view of the above analysis, the present invention is directed to a control circuit for solving the problem that the conventional control circuit has no electrical isolation design for the external interface, and the input misoperation often causes the whole hardware circuit to be burned.
The purpose of the utility model is mainly realized through the following technical scheme:
a control circuit, comprising:
one end of the first isolator is connected with the input interface of the control circuit, and the other end of the first isolator is connected with an input pin of the controller;
one end of the second isolator is connected with an output pin of the controller, and the other end of the second isolator is connected with an output interface of the control circuit through an output driver;
one end of the third isolator is connected with the data communication interface of the controller, and the other end of the third isolator is connected with the communication interface chip; the communication interface chip is used for being connected with external equipment of the control circuit through a communication interface.
Based on the further improvement of the scheme, the controller comprises a processor and a programmable logic device, and the processor and the programmable logic device are connected with a clock pin through an IO interface.
Further, the input interface is a multi-channel input interface; the first isolator is a multi-channel isolator, and each channel has the same structure; the channels of the multi-channel input interface correspond to the channels of the multi-channel isolator one by one; the multichannel isolator comprises a first multichannel optical coupler, and each channel further comprises a first resistor, a second resistor, a diode and a capacitor;
one end of the first resistor of each channel is connected with a pin of a channel corresponding to the multi-channel input interface; the other end of the first resistor is connected with the positive input end of the corresponding channel of the first multi-channel optical coupler; the second resistor is connected between the positive input end and the negative input end of the corresponding channel of the first multi-channel optical coupler; the diode is reversely connected between the positive input end and the negative input end of the corresponding channel of the first multi-channel optical coupler; the capacitor is connected between the positive input end and the negative input end of the corresponding channel of the first multi-channel optical coupler;
and the positive output end of each channel of the first multi-channel optical coupler is respectively connected with an input pin of the controller.
Further, the first isolator further comprises a pull-up resistor; and a plurality of positive output ends of the first multi-channel optical coupler are respectively connected with a pull-up resistor.
Furthermore, the output interface of the control circuit adopts a multi-channel output interface, the output driver is a multi-channel output driving chip, the number of channels of the multi-channel output interface is the same as that of the channels of the multi-channel output driving chip, and the output end of the multi-channel output driving chip is correspondingly connected with the input end of the multi-channel output interface;
the second isolation comprises a second multi-channel photoelectric coupler, and the number of channels of the second multi-channel photoelectric coupler is the same as that of the channels of the multi-channel driving chip; each channel of the second multi-channel optical coupler has the same structure; the positive input end of each channel of the second multi-channel optical coupler is connected with a 3.3V power supply; the negative input end of each channel of the second multi-channel optical coupler is connected with the output interface of the controller; the positive output end of each channel of the second multi-channel optical coupler is connected with a 24V power supply; and the negative output end of each channel of the second multi-channel optical coupler is correspondingly connected with the input end of the output driver.
Further, the multi-channel output driving chip comprises a status pin; the state pin of the multi-channel output driving chip is connected with the input interface of the controller through a photoelectric coupler IC 4; the positive input end of the photoelectric coupler IC4 is connected with the state pin of the multi-channel output driving chip, the negative input end is grounded, the positive output end is connected with a 3.3V power supply, the negative input end is connected with the input interface of the controller through a resistor RD107, and the negative input end of the photoelectric coupler IC4 is also connected with a pull-down resistor RD 108.
Further, the communication interface chip comprises a CAN interface chip or an RS232 interface chip.
Further, when the communication interface chip is a CAN interface chip, the third isolator includes an isolating chip U2, the isolating chip includes a first pin of the isolating chip U2 connected to a 3.3V power supply, a second pin of the isolating chip U2 is connected to a communication data input interface of the controller through a third resistor, a third pin of the isolating chip U2 is connected to a communication data output interface of the controller through a fourth resistor, both the fourth pin and the fifth pin of the isolating chip U2 are grounded, a sixth pin of the isolating chip U2 is connected to a TXD pin of the CAN interface chip, a seventh pin of the isolating chip U2 is connected to a RXD pin of the CAN interface chip, and an eighth pin of the isolating chip U2 is connected to a 5V power supply.
Further, when the communication interface module is an RS232 communication interface module, the third isolator includes a four-channel optical coupler; the negative input ends of the first channel and the second channel of the four-channel optical coupler are respectively connected with the communication data output interface of the controller, and the negative output ends of the first channel and the second channel of the four-channel optical coupler are respectively connected with two TIN pins of an RS232 interface chip; the negative input ends of each three channel and the fourth channel of the four-channel optical coupler are respectively connected with a communication data input interface of the controller, and the negative output ends of the four channels of the optical coupler are respectively connected with two TOUT pins of the RS232 interface chip; and four positive input ends and four positive output ends of the four-channel optical coupler are connected with a 3.3V power supply.
Compared with the prior art, the utility model discloses can realize one of following beneficial effect at least:
1. the external interface adopts the design of electrical isolation and input short circuit prevention, so that the problems of main control board damage and the like caused by short circuit due to improper operation can be effectively avoided;
2. the controller adopts a mode of combining the processor and the programmable logic device, and the capacity of the control board for data processing is enhanced on the basis of meeting the requirement of a control system.
The utility model discloses in, can also make up each other between the above-mentioned each technical scheme to realize more preferred combination scheme. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout the drawings.
Fig. 1 is a schematic connection diagram of a control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a first isolator according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a second isolator according to an embodiment of the present invention;
fig. 4 is a circuit connection diagram of a third isolator in the case where the communication interface chip of the embodiment of the present invention is a CAN interface chip;
fig. 5 is a circuit connection diagram of the third isolator according to the embodiment of the present invention when the communication interface chip is an RS232 interface chip.
Detailed Description
The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit its scope.
The utility model discloses a concrete embodiment discloses a control circuit, as shown in FIG. 1, include:
and one end of the first isolator is connected with the input interface of the control circuit, and the other end of the first isolator is connected with the input pin of the controller.
Specifically, the controller comprises a processor and a programmable logic device, and the processor and the programmable logic device are connected with a clock pin through an IO interface. The input interface is a multi-channel input interface; the first isolator is a multi-channel isolator, and each channel has the same structure; the channels of the multi-channel input interface correspond to the channels of the multi-channel isolator one by one; the multichannel isolator comprises a first multichannel optical coupler, and each channel further comprises a first resistor, a second resistor, a diode and a capacitor; one end of the first resistor of each channel is connected with a pin of a channel corresponding to the multi-channel input interface; the other end of the first resistor is connected with the positive input end of the corresponding channel of the first multi-channel optical coupler; the second resistor is connected between the positive input end and the negative input end of the corresponding channel of the first multi-channel optical coupler; the diode is reversely connected between the positive input end and the negative input end of the corresponding channel of the first multi-channel optical coupler; the capacitor is connected between the positive input end and the negative input end of the corresponding channel of the first multi-channel optical coupler; and the positive output end of each channel of the first multi-channel optical coupler is respectively connected with an input pin of the controller. The first isolator further comprises a pull-up resistor; a plurality of positive output ends of the first multi-channel optical coupler are respectively connected with a pull-up resistor
For example, as shown in fig. 2, the first isolator circuit connection is that the Input interface adopts a 4-pin external interface P5, the first optical multichannel electric coupler adopts a 4-channel optical coupler U8, and taking the Input4 Input channel in fig. 2 as an example, the first pin of the external interface P5 is connected to one end of a resistor RD1, the other end of RD1 is connected to the 1 st pin of an optical coupler U8, one end of the resistor RD2 is connected to the 1 st pin of the optical coupler U8, and the other end is grounded. The anode of the diode D1 is grounded, the cathode is connected with the 1 st pin of the photoelectric coupler U8, one end of the capacitor C17 is connected with the 1 st pin of the photoelectric coupler U8, and the other end of the capacitor C17 is grounded. And a 16 th pin of the photoelectric coupler U8 is connected with an input interface of the controller. The output end of the photoelectric coupler U8 is connected with a pull-up resistor R13. The input control switch of the control circuit is connected into the control circuit through an external interface P5. The input pins of the controller are general IO pins, and some IO pins can be customized to be used as input interfaces in implementation.
The reverse connection diode D1 has the function of preventing reverse connection, and can avoid the condition of chip damage caused by reverse connection of high and low levels due to misoperation. RD1, RD2 realize the current limiting function through the mode of partial pressure, prevent that the input current is too big to damage the isolation chip.
And one end of the second isolator is connected with an output pin of the controller, and the other end of the second isolator is connected with an output interface of the control circuit through an output driver.
Specifically, the output interface of the control circuit adopts a multi-channel output interface, the output driver is a multi-channel output driving chip, the number of channels of the multi-channel output interface is the same as that of the multi-channel output driving chip, and the output end of the multi-channel output driving chip is correspondingly connected with the input end of the multi-channel output interface; the second isolation comprises a second multi-channel photoelectric coupler, and the number of channels of the second multi-channel photoelectric coupler is the same as that of the channels of the multi-channel driving chip; each channel of the second multi-channel optical coupler has the same structure; the positive input end of each channel of the second multi-channel optical coupler is connected with a 3.3V power supply; the negative input end of each channel of the second multi-channel optical coupler is connected with the output interface of the controller; the positive output end of each channel of the second multi-channel optical coupler is connected with a 24V power supply; and the negative output end of each channel of the second multi-channel optical coupler is correspondingly connected with the input end of the output driver. The multi-channel output driving chip comprises a status pin; the state pin of the multi-channel output driving chip is connected with the input interface of the controller through a photoelectric coupler IC 4; the positive input end of the photoelectric coupler IC4 is connected with the state pin of the multi-channel output driving chip, the negative input end is grounded, the positive output end is connected with a 3.3V power supply, the negative input end is connected with the input interface of the controller through a resistor RD107, and the negative input end of the photoelectric coupler IC4 is also connected with a pull-down resistor RD 108.
Illustratively, the circuit of the second isolator is as shown in fig. 3, the multi-channel output interface P9 adopts an 8-channel output interface, the multi-channel output driver adopts an 8-channel output driver chip U45 with model number VN808, and the fourth isolator adopts a 1-channel photocoupler IC 4. Illustratively, the second multi-channel optical coupler may be composed of two four-channel opto-couplers U44 and U47, an output pin of the controller is connected to 8 negative input terminals of the opto-coupler U44 and U47, 8 positive input terminals of the opto-coupler U44 and U47 are connected to a 3.3V power supply, 8 positive output terminals of the opto-coupler U44 and U47 are connected to a 24V power supply through a resistor RD105, and 8 positive output terminals of the opto-coupler U44 and U47 are grounded through a capacitor C235. 8 negative Output ends of the photocoupler U44 and the photocoupler U47 are connected with 8 input pins corresponding to the Output driving chip U45, 8 Output ends of the Output driving chip U45 are connected with 8 pins corresponding to the Output interface P9, and each Output pin of the Output driving chip U45 is grounded through a capacitor, for example, the Output1 Output end is grounded through a capacitor C248. The status pin of the output drive chip U45 is connected to the positive input terminal of the photocoupler IC4, the negative input terminal of the photocoupler IC4 is grounded, the negative output terminal of the photocoupler IC4 is connected to the data input interface of the controller through a resistor RD107, the positive output terminal of the photocoupler IC4 is connected to the 3.3 negative power supply, and the output terminal of the photocoupler IC4 is connected to the pull-down resistor RD 108. The control switch or indicator light of the control circuit can be connected with the control circuit through the multi-channel output interface P9. The output pins of the controller are general IO pins, and some IO pins can be customized to be used as output interfaces during implementation.
The signal of the controller to the outside output is connected to the output drive chip through the photoelectric isolator, so that the drive capability of the output signal is improved, the switching signals with different current requirements can be driven, and the control switch or the indicator lamp of the control circuit is controlled to work. When the external output channel has abnormal conditions such as short circuit, the Status pin Status of the output driving chip outputs high level and feeds back the high level to the controller for relevant processing, so that the interface with the short circuit is effectively monitored and detected, and the loss caused by the short circuit is avoided.
One end of the third isolator is connected with the data communication interface of the controller, and the other end of the third isolator is connected with the communication interface chip; the communication interface chip is used for being connected with external equipment of the control circuit through a communication interface.
Specifically, the communication interface chip includes a CAN interface chip or an RS232 interface chip.
When the communication interface chip is a CAN interface chip, the third isolator includes an isolation chip U2, the isolation chip includes a first pin of the isolation chip U2 connected to a 3.3V power supply, a second pin of the isolation chip U2 is connected to a communication data input interface of the controller through a third resistor, a third pin of the isolation chip U2 is connected to a communication data output interface of the controller through a fourth resistor, both a fourth pin and a fifth pin of the isolation chip U2 are grounded, a sixth pin of the isolation chip U2 is connected to a TXD pin of the CAN interface chip, a seventh pin of the isolation chip U2 is connected to a d pin of the CAN interface chip, and an eighth pin of the isolation chip U rx 2 is connected to a 5V power supply.
When the communication interface chip is an RS232 interface chip, the third isolator comprises a four-channel optical coupler; the negative input ends of the first channel and the second channel of the four-channel optical coupler are respectively connected with the communication data output interface of the controller, and the negative output ends of the first channel and the second channel of the four-channel optical coupler are respectively connected with two TIN pins of an RS232 interface chip; the negative input ends of each three channel and the fourth channel of the four-channel optical coupler are respectively connected with a communication data input interface of the controller, and the negative output ends of the four channels of the optical coupler are respectively connected with two TOUT pins of the RS232 interface chip; and four positive input ends and four positive output ends of the four-channel optical coupler are connected with a 3.3V power supply.
For example, when the communication interface chip is a CAN interface chip, as shown in fig. 4, the third isolator employs an 8-pin isolation chip U2, the CAN interface chip employs an 8-pin CAN transceiver U1, and the communication interface employs a 3-pin communication interface P1. The VOA pin of the isolation chip U2 is connected with one end of a resistor R1, the other end of R1 is connected with a CAN data input interface of a controller, the VIB pin of the isolation chip U2 is connected with one end of a resistor R2, the other end of the resistor R2 is connected with a CAN data output interface of the controller, the VOB pin of the isolation chip U2 is connected with a TXD pin of a CAN transceiver U1, the VIA end of the isolation chip U2 is connected with an RXD pin of a CAN transceiver U1, GND1 and GND2 pins of the isolation chip U2 are all grounded, the VDD1 pin of the isolation chip U2 is connected with a 3.3V power supply, and the VDD2 pin of the isolation chip U2 is connected with a 5V power supply.
Illustratively, a CANH pin of the CAN transceiver U1 is connected to a 3 rd pin of the P1, a CANL terminal of the CAN transceiver chip U1 is connected to a 2 nd pin of the P1, both an STB pin and a GND pin of the CAN transceiver U1 are grounded, a VIO pin and a VCC pin of the CAN transceiver U1 are connected to a 5V power supply, a CANH pin of the CAN transceiver U1 is further connected to one end of a resistor R3, the other end of the resistor R3 is grounded through a capacitor C8, a CANL pin of the CAN transceiver U1 is further connected to a ground resistor R4, the other end of the resistor R4 is grounded through a capacitor C8, the voltage stabilizing chip U3 is a 3-pin chip, a first pin of the voltage stabilizing chip U3 is connected to a CANL pin of the CAN transceiver U1, a second pin of the voltage stabilizing chip U3 is connected to a CANH pin of the transceiver U1, and a third pin of the voltage stabilizing chip U3 is grounded. Pin 1 of P1 is grounded. The external equipment of the control circuit can be accessed into the control circuit through an external interface P1.
For an example, when the communication interface chip is an RS232 interface chip, as shown in fig. 5, the third isolator employs a four-channel photocoupler U52, the RS232 interface chip is a 16-pin interface chip IC2, and the communication interface includes a 9-pin RS232 interface P18 and a 9-pin RS232 interface P19. A 2 nd pin and a 4 th pin of the U52 are respectively connected with an RS232 data output pin of the controller, and a 6 th pin and an 8 th pin are respectively connected with an RS232 data input pin of the controller; the 1 st pin, the 3 rd pin, the 5 th pin and the 7 th pin of the U52 are all connected with a 3.3V power supply; the 9 th pin of the U52 is connected with the R2OUT pin of the IC2, the 11 th pin is connected with the R1OUT pin of the IC2, the 13 th pin is connected with the T2IN pin of the IC2, and the 15 th pin is connected with the T1IN pin of the IC 2; the 10 th pin, the 12 th pin, the 14 th pin and the 16 th pin of the U52 are all connected with a 3.3V power supply. The T1OUT pin of the IC2 is connected with the 3 rd pin of the interface P18 through a resistor R82; the T2OUT pin of the IC2 is connected with the 3 rd pin of the interface P19 through a resistor R83; the R1IN pin of the IC2 is connected with the 2 nd pin of the interface P18 through a resistor R84; the pin R2IN of the IC2 is connected to the pin 2 of the interface P19 through a resistor R85.
In order to enable the external device to be connected more flexibly, in the control circuit provided by this embodiment, the controller includes a processor and a programmable logic device, and the processor and the programmable logic device are connected with a clock pin through an IO interface.
Illustratively, the processor selects the STM32 family of chips and the programmable logic device uses the ALTERA related product.
During implementation, three different working modes can be selected according to actual functional requirements. The first mode is as follows: the programmable logic device and the peripheral thereof are in a sleep mode, the mode is less in application of connecting the peripheral, only some control work needs to be finished, and when an expanded IO switch control interface is not needed to be connected with control equipment, the situation that complex signals need to be processed does not exist;
and a second mode: the programmable logic device controls the peripheral equipment to work, the processor and the peripheral equipment connected with the processor are in a sleep mode, and the mode is applied to the condition that the requirement of an IO control interface needs to be expanded or the requirement on data processing, such as synchronous signal processing and the like is high;
and a third mode: the processor and the programmable logic device work cooperatively to jointly complete related control tasks, and the mode is applied to the situations that the control thread is complex, the data processing requirement is high, the number of connected peripherals is large, and the functional requirements of an IO interface need to be expanded.
Compared with the prior art, the control circuit provided by the embodiment can realize one of the following beneficial effects:
1. the external input and output interface adopts the design of electrical isolation and input short circuit prevention, so that the problems of damage to a main control board and the like caused by termination due to improper operation can be effectively avoided;
2. the controller adopts a mode of combining the processor and the programmable logic device, and the capacity of the control board for data processing is enhanced on the basis of meeting the requirement of a control system.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (9)
1. A control circuit, comprising:
one end of the first isolator is connected with the input interface of the control circuit, and the other end of the first isolator is connected with an input pin of the controller;
one end of the second isolator is connected with an output pin of the controller, and the other end of the second isolator is connected with an output interface of the control circuit through an output driver;
one end of the third isolator is connected with the data communication interface of the controller, and the other end of the third isolator is connected with the communication interface chip; the communication interface chip is used for being connected with external equipment of the control circuit through a communication interface.
2. The control circuit of claim 1, wherein the controller comprises a processor and a programmable logic device, the processor and the programmable logic device being connected to a clock pin via an IO interface.
3. The control circuit of any of claims 1-2, wherein the input interface is a multi-channel input interface; the first isolator is a multi-channel isolator, and each channel has the same structure; the channels of the multi-channel input interface correspond to the channels of the multi-channel isolator one by one; the multichannel isolator comprises a first multichannel optical coupler, and each channel further comprises a first resistor, a second resistor, a diode and a capacitor;
one end of the first resistor of each channel is connected with a pin of a channel corresponding to the multi-channel input interface; the other end of the first resistor is connected with the positive input end of the corresponding channel of the first multi-channel optical coupler; the second resistor is connected between the positive input end and the negative input end of the corresponding channel of the first multi-channel optical coupler; the diode is reversely connected between the positive input end and the negative input end of the corresponding channel of the first multi-channel optical coupler; the capacitor is connected between the positive input end and the negative input end of the corresponding channel of the first multi-channel optical coupler;
and the positive output end of each channel of the first multi-channel optical coupler is respectively connected with an input pin of the controller.
4. The control circuit of claim 3, wherein: the first isolator further comprises a pull-up resistor; and a plurality of positive output ends of the first multi-channel optical coupler are respectively connected with a pull-up resistor.
5. The control circuit according to any one of claims 1-2, wherein an output interface of the control circuit adopts a multi-channel output interface, the output driver is a multi-channel output driver chip, the number of channels of the multi-channel output interface is the same as the number of channels of the multi-channel output driver chip, and the output end of the multi-channel output driver chip is correspondingly connected with the input end of the multi-channel output interface;
the second isolation comprises a second multi-channel photoelectric coupler, and the number of channels of the second multi-channel photoelectric coupler is the same as that of the channels of the multi-channel driving chip; each channel of the second multi-channel optical coupler has the same structure; the positive input end of each channel of the second multi-channel optical coupler is connected with a 3.3V power supply; the negative input end of each channel of the second multi-channel optical coupler is connected with the output interface of the controller; the positive output end of each channel of the second multi-channel optical coupler is connected with a 24V power supply; and the negative output end of each channel of the second multi-channel optical coupler is correspondingly connected with the input end of the output driver.
6. The control circuit of claim 5, wherein the multi-channel output driver chip includes a status pin; the state pin of the multi-channel output driving chip is connected with the input interface of the controller through a photoelectric coupler IC 4; the positive input end of the photoelectric coupler IC4 is connected with the state pin of the multi-channel output driving chip, the negative input end is grounded, the positive output end is connected with a 3.3V power supply, the negative input end is connected with the input interface of the controller through a resistor RD107, and the negative input end of the photoelectric coupler IC4 is also connected with a pull-down resistor RD 108.
7. The control circuit of any of claims 1-2, wherein the communication interface chip comprises a CAN interface chip or an RS232 interface chip.
8. The control circuit of claim 7, wherein when the communication interface chip is a CAN interface chip, the third isolator includes an isolating chip U2, the isolating chip includes a first pin of the isolating chip U2 connected to a 3.3V power supply, a second pin of the isolating chip U2 connected to a communication data input interface of the controller through a third resistor, a third pin of the isolating chip U2 connected to a communication data output interface of the controller through a fourth resistor, a fourth pin and a fifth pin of the isolating chip U2 both connected to ground, a sixth pin of the isolating chip U2 connected to a TXD pin of the CAN interface chip, a seventh pin of the isolating chip U2 connected to an RXD pin of the CAN interface chip, and an eighth pin of the isolating chip U2 connected to a 5V power supply.
9. The control circuit of claim 7, wherein when the communication interface chip is an RS232 interface chip, the third isolator comprises a four-channel optocoupler; the negative input ends of the first channel and the second channel of the four-channel optical coupler are respectively connected with the communication data output interface of the controller, and the negative output ends of the first channel and the second channel of the four-channel optical coupler are respectively connected with two TIN pins of an RS232 interface chip; the negative input ends of each three channel and the fourth channel of the four-channel optical coupler are respectively connected with a communication data input interface of the controller, and the negative output ends of the four channels of the optical coupler are respectively connected with two TOUT pins of the RS232 interface chip; and four positive input ends and four positive output ends of the four-channel optical coupler are connected with a 3.3V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023064066.7U CN214151427U (en) | 2020-12-17 | 2020-12-17 | Control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023064066.7U CN214151427U (en) | 2020-12-17 | 2020-12-17 | Control circuit |
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| CN214151427U true CN214151427U (en) | 2021-09-07 |
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| CN202023064066.7U Active CN214151427U (en) | 2020-12-17 | 2020-12-17 | Control circuit |
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