CN111459058A - Singlechip anti-interference circuit and high-voltage control system - Google Patents
Singlechip anti-interference circuit and high-voltage control system Download PDFInfo
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- CN111459058A CN111459058A CN201910673354.5A CN201910673354A CN111459058A CN 111459058 A CN111459058 A CN 111459058A CN 201910673354 A CN201910673354 A CN 201910673354A CN 111459058 A CN111459058 A CN 111459058A
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- 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
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Abstract
The invention provides a singlechip anti-jamming circuit and a high-voltage control system, wherein the singlechip anti-jamming circuit comprises a control signal isolation circuit, a first data signal isolation circuit and a second data signal isolation circuit, and the control signal isolation circuit is used for realizing the isolation of a singlechip system and a control signal of a system to be isolated through a photoelectric coupler; the first data signal isolation circuit and the second data signal isolation circuit are used for realizing the isolation of the data signals of the single chip microcomputer system and the system to be isolated through the photoelectric coupler, the DAC chip and the ADC chip. The high-voltage control system provided by the invention comprises a single chip microcomputer system, a high-voltage system and the single chip microcomputer anti-interference circuit. The invention can thoroughly solve the interference of accidental corona, creepage, arc discharge and discharge of a high-voltage system to the single chip microcomputer by isolating the single chip microcomputer system from the system to be isolated by control signals and data signals, and greatly improves the anti-interference capability of the single chip microcomputer.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a singlechip anti-interference circuit and a high-voltage control system.
Background
In some common equipment containing a high-voltage control system, such as a capillary electrophoresis apparatus, an X-ray machine, a linear accelerator, an external shock wave lithotripter and the like, in a fault state, corona, creepage, arc discharge and discharge generated by high voltage can cause accidental reset, halt, restart and even burn out of a single chip microcomputer system, so that the improvement of the anti-interference capability of the single chip microcomputer has important significance for the safe use of the equipment.
At present, the common method for improving the anti-interference capability of the single chip microcomputer is to add a filter capacitor, an inductor or a magnetic bead, adopt a twisted pair with a shielding layer as a power line, add a power filter and other measures, and although the measures can improve the anti-interference capability of the single chip microcomputer to a certain extent, the measures cannot fundamentally eliminate the interference of high-voltage corona, creepage, arc discharge and discharge on the single chip microcomputer.
Disclosure of Invention
The embodiment of the invention provides an anti-interference circuit of a single chip microcomputer and a high-voltage control system, and aims to solve the problem that the existing anti-interference method of the single chip microcomputer cannot fundamentally eliminate the interference of high-voltage corona, creepage, arc discharge and discharge on the single chip microcomputer.
The embodiment of the invention provides an anti-interference circuit of a single chip microcomputer, which comprises a control signal isolation circuit, a first data signal isolation circuit and a second data signal isolation circuit;
the control signal isolation circuit comprises a first photoelectric coupler, the input end of the first photoelectric coupler is connected with the state output port of the single chip microcomputer system, and the output end of the first photoelectric coupler is connected with the state input port of the system to be isolated, so that the control signal isolation of the single chip microcomputer system and the system to be isolated is realized;
the first data signal isolation circuit comprises a second photoelectric coupler and a DAC chip, wherein the input end of the second photoelectric coupler is connected with the data output port of the single chip microcomputer system, the output end of the second photoelectric coupler is connected with the input end of the DAC chip, and the output end of the DAC chip is connected with the data input port of the system to be isolated, so that the data signal isolation of the single chip microcomputer system and the system to be isolated is realized;
the second data signal isolation circuit comprises a third photoelectric coupler and an ADC chip, wherein the input end of the third photoelectric coupler is connected with the output end of the ADC chip, the input end of the ADC chip is connected with the data output port of the system to be isolated, and the output end of the third photoelectric coupler is connected with the data input port of the single chip microcomputer system so as to isolate the single chip microcomputer system from the data signal of the system to be isolated.
Optionally, the system further comprises a low-voltage power supply and a high-voltage power supply, wherein the low-voltage power supply and the high-voltage power supply are isolated through a power isolation module, the low-voltage power supply is used for supplying power to the single chip microcomputer system, and the high-voltage power supply is used for supplying power to the system to be isolated.
Optionally, the input end of the first photoelectric coupler includes a first input interface and a second input interface, the first input interface is connected with the low-voltage power supply, and the second input interface is connected with the state output port of the single chip microcomputer system; the output end of the first photoelectric coupler comprises a first output interface and a second output interface, the first output interface is respectively connected with the high-voltage power supply and the state input port of the system to be isolated, and the second output interface is connected with the ground wire of the high-voltage power supply.
Optionally, the control signal isolation circuit further includes a first resistor and a second resistor, the first resistor is connected between the first input interface and the low-voltage power supply, and the second resistor is connected between the first output interface and the high-voltage power supply.
Optionally, the input end of the second photoelectric coupler includes a first input interface and a second input interface, the first input interface of the second photoelectric coupler is connected with the low-voltage power supply, and the second input interface of the second photoelectric coupler is connected with the data output port of the single chip microcomputer system; the output end of the second photoelectric coupler comprises a first output interface and a second output interface, the first output interface of the second photoelectric coupler is respectively connected with the high-voltage power supply and the input end of the DAC chip, and the second output interface of the second photoelectric coupler is connected with the ground wire of the high-voltage power supply.
Optionally, the first data signal isolation circuit further includes a third resistor and a fourth resistor, the third resistor is connected between the first input interface of the second photoelectric coupler and the low-voltage power supply, and the fourth resistor is connected between the first output interface of the second photoelectric coupler and the high-voltage power supply.
Optionally, the input end of the third photoelectric coupler includes a first input interface and a second input interface, the first input interface of the third photoelectric coupler is connected to the high-voltage power supply, and the second input interface of the third photoelectric coupler is connected to the output end of the ADC chip; the output end of the third photoelectric coupler comprises a first output interface and a second output interface, the first output interface of the third photoelectric coupler is respectively connected with the low-voltage power supply and the data input port of the single chip microcomputer system, and the second output interface of the third photoelectric coupler is connected with the ground wire of the low-voltage power supply.
Optionally, the second data signal isolation circuit further includes a fifth resistor and a sixth resistor, the fifth resistor is connected between the first output interface of the third photoelectric coupler and the low-voltage power supply, and the sixth resistor is connected between the first input interface of the third photoelectric coupler and the high-voltage power supply.
In addition, the embodiment of the invention also provides a high-voltage control system which comprises a single chip microcomputer system, a high-voltage system and the single chip microcomputer anti-interference circuit.
The anti-interference circuit and the high-voltage control system of the single chip microcomputer provided by the embodiment of the invention adopt the photoelectric coupler to completely isolate the control line and the digit line of the single chip microcomputer from the high-voltage system to be isolated, can thoroughly solve the interference of accidental corona, creepage, arc discharge and discharge of the high-voltage system on the single chip microcomputer, and greatly improve the anti-interference capability of the single chip microcomputer.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a block diagram of an anti-interference circuit of a single chip microcomputer according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an anti-interference circuit of a single chip microcomputer according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a block diagram of an anti-interference circuit of a single chip microcomputer according to an embodiment of the present invention. As shown in fig. 1, the anti-jamming circuit for a single chip microcomputer according to the embodiment of the present invention includes a control signal isolation circuit 10, a first data signal isolation circuit 20, and a second data signal isolation circuit 30, where:
the control signal isolation circuit 10 comprises a first photoelectric coupler T1, wherein the input end of the first photoelectric coupler T1 is connected with the state output port of the single chip microcomputer system U1, and the output end of the first photoelectric coupler T1 is connected with the state input port of the system to be isolated U4, so that the control signal isolation between the single chip microcomputer system U1 and the system to be isolated U4 is realized;
the first data signal isolation circuit 20 comprises a second photoelectric coupler T2 and a DAC chip U2, wherein the input end of the second photoelectric coupler T2 is connected with the data output port of the single chip microcomputer system U1, the output end of the second photoelectric coupler T2 is connected with the input end of the DAC chip U2, and the output end of the DAC chip U2 is connected with the data input port of the system to be isolated U4, so that the data signal isolation between the single chip microcomputer system U1 and the system to be isolated U4 is realized;
the second data signal isolation circuit 30 comprises a third photoelectric coupler T3 and an ADC chip U3, the input end of the third photoelectric coupler T3 is connected with the output end of the ADC chip U3, the input end of the ADC chip U3 is connected with the data output port of the system to be isolated U4, and the output end of the third photoelectric coupler T3 is connected with the data input port of the single chip microcomputer system U1, so that the data signal isolation of the single chip microcomputer system U1 and the system to be isolated U4 is realized.
The photocouplers T1, T2, and T3 used in this embodiment may be common photocouplers, for example, the photocoupler with the model number E L357N.
The anti-interference circuit of the single chip microcomputer provided by the embodiment of the invention can be used for a high-voltage system and can also be used for inductive loads, such as control systems of a high-power motor and the like, so that the anti-interference capability of the single chip microcomputer is greatly improved.
The singlechip anti-interference circuit provided by the embodiment of the invention adopts the photoelectric coupler to completely isolate the control line and the digit line of the singlechip from the high-voltage system to be isolated, can thoroughly solve the interference of accidental corona, creepage, arc discharge and discharge of the high-voltage system on the singlechip, and greatly improves the anti-interference capability of the singlechip.
In the embodiment of the invention, the single chip microcomputer anti-interference circuit further comprises a low-voltage power supply VC and a high-voltage power supply VH, the low-voltage power supply VC and the high-voltage power supply VH are isolated by a power isolation module, the low-voltage power supply is used for supplying power to the single chip microcomputer system, and the high-voltage power supply is used for supplying power to the system to be isolated. In this embodiment, the isolation of the low-voltage power supply VC and the high-voltage power supply VH can be realized by using the existing common power supply isolation module, so that the anti-interference capability of the single chip microcomputer is further improved.
Fig. 2 is a specific circuit schematic diagram of an anti-interference circuit of a single chip microcomputer according to an embodiment of the present invention. In an embodiment of the present invention, referring to fig. 2, an input end of the first photocoupler T1 includes a first input interface 1 and a second input interface 2, the first input interface 1 is connected to the low-voltage power supply VC, and the second input interface 2 is connected to a status output port 2 of the single chip microcomputer U1; the output end of the first photoelectric coupler T1 comprises a first output interface 4 and a second output interface 3, the first output interface 4 is respectively connected with the high-voltage power supply VH and the state input port 2 of the system to be isolated U4, and the second output interface 3 is connected with the high-voltage power supply ground wire GND _ H. Further, the control signal isolation circuit 10 further includes a current-limiting resistor, i.e., a first resistor R1 and a second resistor R2, the first resistor R1 is connected between the first input interface 1 of the first photocoupler T1 and the low-voltage power supply VC, and the second resistor R2 is connected between the first output interface of the first photocoupler T1 and the high-voltage power supply VH.
Referring to fig. 2, the input end of a second photocoupler T2 includes a first input interface 1 and a second input interface 2, the first input interface 1 of the second photocoupler T2 is connected with the low-voltage power supply VC, and the second input interface 2 of the second photocoupler T2 is connected with the data output port 3 of the single chip microcomputer system U1; the output end of the second photoelectric coupler T2 comprises a first output interface 4 and a second output interface 3, the first output interface 4 of the second photoelectric coupler T2 is respectively connected with the high-voltage power supply VH and the input end of the DAC chip U2, and the second output interface 3 of the second photoelectric coupler T2 is connected with the high-voltage power supply ground GND _ H. Further, the first data signal isolation circuit 20 further includes a current limiting resistor, i.e., a third resistor R3 and a fourth resistor R4, the third resistor R3 is connected between the first input interface 1 of the second photocoupler T2 and the low voltage power supply VC, and the fourth resistor R4 is connected between the first output interface 4 of the second photocoupler T2 and the high voltage power supply VH.
Referring to fig. 2, the input end of a third photocoupler T3 includes a first input interface 1 and a second input interface 2, the first input interface 1 of the third photocoupler T3 is connected with the high voltage power supply VH, and the second input interface 2 of the third photocoupler T3 is connected with the output end of the ADC chip U3; the output end of the third photoelectric coupler T3 comprises a first output interface 4 and a second output interface 3, the first output interface 4 of the third photoelectric coupler T3 is respectively connected with the low-voltage power supply VC and the data input port 4 of the single chip microcomputer system U1, and the second output interface 3 of the third photoelectric coupler T3 is connected with the low-voltage power supply ground wire GND. Further, the second data signal isolation circuit 30 further includes a current limiting resistor, i.e., a fifth resistor R5 and a sixth resistor R6, the fifth resistor R5 is connected between the first output interface 4 of the third photocoupler T3 and the low voltage power supply VC, and the sixth resistor R6 is connected between the first input interface 1 of the third photocoupler T3 and the high voltage power supply VH.
The working principle of the anti-interference circuit of the single chip microcomputer provided by the embodiment of the invention is as follows:
the current limiting resistor R1 can limit the current flowing into the photoelectric coupler T1 and the single chip microcomputer U1; the current limiting resistor R3 can limit the current flowing into the photoelectric coupler T2 and the single chip microcomputer U1; the current limiting resistor R5 can limit the current flowing into the photoelectric coupler T3 and the single chip microcomputer U1; the current limiting resistor R2 can limit the current flowing into the photoelectric coupler T1 and the high-voltage module U4; the current limiting resistor R4 can limit the current flowing into the photoelectric coupler T2 and the DAC chip U2; the current limiting resistor R6 can limit the current flowing into the photoelectric coupler T3 and the ADC chip U3; the state of a photoelectric coupler T1 can be controlled by setting the state of a port 2 of a single chip microcomputer U1, if the port 2 of the single chip microcomputer U1 is set to be low, the photoelectric coupler T1 is conducted, the port 2 of a high-voltage module U4 is pulled to be low, otherwise, the port 2 of the single chip microcomputer U1 is set to be high, the photoelectric coupler T1 is not conducted, and the port 2 of the high-voltage module U4 is pulled to be high; the state of a photoelectric coupler T2 can be controlled by setting the state of a port 3 of a single chip microcomputer U1, if the port 3 of the single chip microcomputer U1 is set to be low, the photoelectric coupler T2 is conducted, a port 1 of a DAC chip U2 is pulled to be low, otherwise, the port 3 of the single chip microcomputer U1 is set to be high, the photoelectric coupler T2 is not conducted, the port 1 of the DAC chip U2 is pulled to be high, and the single chip microcomputer U1 indirectly controls a high-voltage module U4 by transmitting data to a DAC chip U2; the high-voltage module U4 can control the state of the photoelectric coupler T3 through the ADC chip U3, if the port 1 of the ADC chip U3 is set to be low, the photoelectric coupler T3 is conducted, the port 4 of the single chip microcomputer U1 is pulled to be low, otherwise, the port 1 of the ADC chip U3 is set to be high, the photoelectric coupler T3 is not conducted, the port 4 of the single chip microcomputer U1 is pulled to be high, and the high-voltage module U4 indirectly transmits data to the single chip microcomputer U1 through the ADC chip U3. No matter the single chip microcomputer U1 and the high-voltage module U4 are in direct communication or indirect communication, the direct communication or the indirect communication is achieved through a photoelectric coupler, wherein the photoelectric coupler is an isolating device, and interference on electric signals is removed through conversion between electric signals.
In addition, the embodiment of the invention also provides a high-voltage control system which comprises a single chip microcomputer system, a high-voltage system and the single chip microcomputer anti-interference circuit. The singlechip anti-interference circuit shown in the embodiment is arranged between the singlechip system and the high-voltage system, and the direct communication or the indirect communication between the singlechip U1 and the high-voltage module U4 is completed through the photoelectric coupler, so that the interference on the electric signals is removed through the conversion between the electro-optical signals.
The anti-interference circuit and the high-voltage control system of the single chip microcomputer provided by the embodiment of the invention adopt the photoelectric coupler to completely isolate the control line and the digit line of the single chip microcomputer from the high-voltage system to be isolated, can thoroughly solve the interference of accidental corona, creepage, arc discharge and discharge of the high-voltage system on the single chip microcomputer, and greatly improve the anti-interference capability of the single chip microcomputer.
In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (9)
1. An anti-interference circuit of a singlechip is characterized by comprising a control signal isolation circuit, a first data signal isolation circuit and a second data signal isolation circuit;
the control signal isolation circuit comprises a first photoelectric coupler, the input end of the first photoelectric coupler is connected with the state output port of the single chip microcomputer system, and the output end of the first photoelectric coupler is connected with the state input port of the system to be isolated, so that the control signal isolation of the single chip microcomputer system and the system to be isolated is realized;
the first data signal isolation circuit comprises a second photoelectric coupler and a DAC chip, wherein the input end of the second photoelectric coupler is connected with the data output port of the single chip microcomputer system, the output end of the second photoelectric coupler is connected with the input end of the DAC chip, and the output end of the DAC chip is connected with the data input port of the system to be isolated, so that the data signal isolation of the single chip microcomputer system and the system to be isolated is realized;
the second data signal isolation circuit comprises a third photoelectric coupler and an ADC chip, wherein the input end of the third photoelectric coupler is connected with the output end of the ADC chip, the input end of the ADC chip is connected with the data output port of the system to be isolated, and the output end of the third photoelectric coupler is connected with the data input port of the single chip microcomputer system so as to isolate the single chip microcomputer system from the data signal of the system to be isolated.
2. The anti-jamming circuit of claim 1, further comprising a low voltage power supply and a high voltage power supply, the low voltage power supply and the high voltage power supply being isolated by a power isolation module, the low voltage power supply being configured to supply power to the system on the chip, and the high voltage power supply being configured to supply power to the system to be isolated.
3. The single-chip microcomputer anti-jamming circuit according to claim 2, wherein the input terminal of the first photoelectric coupler includes a first input interface and a second input interface, the first input interface is connected to the low-voltage power supply, and the second input interface is connected to a status output port of the single-chip microcomputer system; the output end of the first photoelectric coupler comprises a first output interface and a second output interface, the first output interface is respectively connected with the high-voltage power supply and the state input port of the system to be isolated, and the second output interface is connected with the ground wire of the high-voltage power supply.
4. The single-chip anti-jamming circuit of claim 3, wherein the control signal isolation circuit further includes a first resistor and a second resistor, the first resistor being connected between the first input interface and the low voltage power supply, the second resistor being connected between the first output interface and the high voltage power supply.
5. The single-chip microcomputer anti-jamming circuit according to claim 2, wherein the input terminal of the second photoelectric coupler includes a first input interface and a second input interface, the first input interface of the second photoelectric coupler is connected to the low-voltage power supply, and the second input interface of the second photoelectric coupler is connected to the data output port of the single-chip microcomputer system; the output end of the second photoelectric coupler comprises a first output interface and a second output interface, the first output interface of the second photoelectric coupler is respectively connected with the high-voltage power supply and the input end of the DAC chip, and the second output interface of the second photoelectric coupler is connected with the ground wire of the high-voltage power supply.
6. The MCU immunity circuit of claim 5, wherein the first data signal isolation circuit further comprises a third resistor and a fourth resistor, the third resistor is connected between the first input interface of the second photocoupler and the low voltage power supply, and the fourth resistor is connected between the first output interface of the second photocoupler and the high voltage power supply.
7. The single-chip microcomputer anti-jamming circuit according to claim 2, wherein the input terminal of the third photoelectric coupler comprises a first input interface and a second input interface, the first input interface of the third photoelectric coupler is connected to the high-voltage power supply, and the second input interface of the third photoelectric coupler is connected to the output terminal of the ADC chip; the output end of the third photoelectric coupler comprises a first output interface and a second output interface, the first output interface of the third photoelectric coupler is respectively connected with the low-voltage power supply and the data input port of the single chip microcomputer system, and the second output interface of the third photoelectric coupler is connected with the ground wire of the low-voltage power supply.
8. The mcu as defined in claim 7, wherein the second data signal isolation circuit further comprises a fifth resistor and a sixth resistor, the fifth resistor is connected between the first output interface of the third photocoupler and the low voltage power supply, and the sixth resistor is connected between the first input interface of the third photocoupler and the high voltage power supply.
9. A high voltage control system, characterized in that the high voltage control system comprises a single chip microcomputer system, a high voltage system and a single chip microcomputer anti-jamming circuit according to any one of claims 1-8.
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