CN218587174U - Communication isolation circuit and switching power supply - Google Patents
Communication isolation circuit and switching power supply Download PDFInfo
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- CN218587174U CN218587174U CN202222355438.4U CN202222355438U CN218587174U CN 218587174 U CN218587174 U CN 218587174U CN 202222355438 U CN202222355438 U CN 202222355438U CN 218587174 U CN218587174 U CN 218587174U
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Abstract
The utility model discloses a communication isolation circuit and switching power supply, wherein the communication isolation circuit comprises a first filtering module, which is provided with a first filtering transmission end and a second filtering transmission end, and the first filtering module is used for receiving the communication signal output by the main control module and carrying out filtering processing; the communication isolation module is provided with a first signal transmission end and a second signal transmission end, and the first signal transmission end is connected with the second filtering transmission end; and the second filtering module is provided with a third filtering transmission end and a fourth filtering transmission end, the third filtering transmission end is connected with the second signal transmission end, and the second filtering module is used for carrying out communication signal interaction with external equipment through the fourth filtering transmission end and carrying out filtering processing on the communication signals. The communication isolation module has the advantages of high electromagnetic immunity and low radiation, and can improve the communication quality. The whole circuit is simple in structure, and effectively achieves the effect of lower cost on the basis of achieving isolation and filtering.
Description
Technical Field
The utility model relates to a communication isolation technical field, in particular to communication isolation circuit and switching power supply.
Background
With the development of the switching power supply technology, the communication of the power supply is more and more widely applied, generally, the power supply has I2C communication, CAN communication, RS485 communication and the like, and the RS485 communication of most power supplies is realized by adopting a high-speed optical coupler and an isolation communication chip. The traditional RS485 or CAN isolation communication needs to adopt two high-speed optical couplers (transmitting and receiving), is generally expensive, is provided with an isolation driving chip, and is also provided with a primary side and a secondary side of the isolation chip for independent isolation power supply in some communication circuits, so that the circuit is complex and high in cost, and the communication circuit is easily interfered on a PCB (printed circuit board).
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a communication isolation circuit can effectively simplify the circuit and reduce cost.
The utility model discloses still provide a switching power supply who has above-mentioned communication isolation circuit.
According to the utility model discloses communication buffer circuit of first aspect embodiment, include: the device comprises a first filtering module, a communication isolation module and a second filtering module.
The first filtering module is provided with a first filtering transmission end and a second filtering transmission end and is used for receiving the communication signals output by the main control module and carrying out filtering processing;
the communication isolation module is provided with a first signal transmission end and a second signal transmission end, and the first signal transmission end is connected with the second filtering transmission end;
and the second filtering module is provided with a third filtering transmission end and a fourth filtering transmission end, the third filtering transmission end is connected with the second signal transmission end, and the second filtering module is used for performing communication signal interaction with external equipment through the fourth filtering transmission end and filtering the communication signal.
According to the utility model discloses communication buffer circuit has following beneficial effect at least:
the first filtering module receives the communication signals output by the main control module and then carries out filtering processing on the signals to obtain the communication signals with specific frequency, and then the communication signals are input into the communication isolation module through the second filtering transmission end, the communication isolation module has the advantages of high electromagnetic immunity and low radiation, the communication quality can be improved, the high-voltage surge resistance of a system applying the circuit can be improved, and the construction safety of operators can be guaranteed to a greater extent. The communication signal after passing through the communication isolation module is transmitted to the second filtering module for filtering again, so that the ripple coefficient of the output voltage is reduced, the waveform becomes smoother, and the output voltage is output to external equipment through the fourth filtering transmission end. The whole circuit is simple in structure, and effectively achieves the effect of lower cost on the basis of achieving isolation and filtering.
According to some embodiments of the invention, the first filtering module comprises:
one end of the first resistor is connected with the main control module;
one end of the first capacitor is connected with the other end of the first resistor, and the other end of the first capacitor is used for being connected with a ground wire;
one end of the second resistor is connected with the main control module;
and one end of the second capacitor is connected with the other end of the second resistor, and the other end of the second capacitor is connected with the ground wire.
According to some embodiments of the invention, the communication isolation module comprises:
the isolation transceiver is provided with a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, the first connecting end is connected with the other end of the first resistor, the second connecting end is connected with the other end of the second resistor, and the third connecting end and the fourth connecting end are both connected with the third filtering transmission end.
According to some embodiments of the invention, the isolation transceiver employs NSI83085.
According to some embodiments of the invention, the isolation transceiver further has a fifth connection end and a sixth connection end;
the communication isolation module further comprises:
one end of the third capacitor is connected with a power supply, and the other end of the third capacitor is connected with the fifth connecting end;
and one end of the fourth capacitor is connected with the power supply, and the other end of the fourth capacitor is connected with the sixth connecting end.
According to some embodiments of the invention, the second filtering module comprises:
a fifth capacitor, one end of which is connected with the third connection end;
one end of the third resistor is connected with the other end of the fifth capacitor, and the other end of the third resistor is connected with the external equipment;
a sixth capacitor, one end of which is connected to the fourth connection terminal and the other end of which is connected to the one end of the fifth capacitor;
and one end of the fourth resistor is connected with the one end of the sixth capacitor, and the other end of the fourth resistor is connected with the external equipment.
According to some embodiments of the present invention, the second filtering module further comprises:
one end of the fifth resistor is connected with the third connecting end, and the other end of the fifth resistor is connected with the fourth connecting end;
a first transient voltage suppressor, one end of which is connected with the other end of the third resistor, and the other end of which is used for connecting a ground wire;
and one end of the second transient voltage suppressor is connected with the other end of the fourth resistor, and the other end of the second transient voltage suppressor is connected with the ground wire.
According to some embodiments of the invention, the isolation transceiver further has a seventh connection end and an eighth connection end;
the first filtering module further comprises:
one end of the sixth resistor is connected with the main control module, and the other end of the sixth resistor is connected with the seventh connecting end;
and one end of the seventh capacitor is connected with the other end of the sixth resistor, and the other end of the seventh capacitor is connected with the eighth connecting end.
According to the utility model discloses switching power supply of second aspect embodiment includes the communication isolation circuit as described in the first aspect.
The communication isolation circuit of the first aspect is applied, the first filtering module receives the communication signals output by the main control module and then filters the signals to obtain the communication signals with specific frequency, and the communication signals are input to the communication isolation module through the second filtering transmission end, and the communication isolation module has the advantages of high electromagnetic immunity and low radiation, can improve the communication quality, can also improve the high-voltage surge resistance of a system applying the circuit, and can ensure the construction safety of operators to a greater extent. The communication signal after passing through the communication isolation module is transmitted to the second filtering module for filtering again, so that the ripple coefficient of the output voltage is reduced, the waveform becomes smoother, and the output voltage is output to external equipment through the fourth filtering transmission end. The whole circuit is simple in structure, and effectively achieves the effect of lower cost on the basis of achieving isolation and filtering.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention will be further described with reference to the following drawings and examples, in which:
fig. 1 is a system block diagram of a communication isolation circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a main control module according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a first filtering module according to an embodiment of the present invention;
fig. 4 is a circuit diagram of the communication isolation module and the second filtering module according to an embodiment of the present invention.
Reference numbers:
a first filtering module 100;
a main control module 200;
a communication isolation module 300;
a second filtering module 400;
an external device 500.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper and lower directions, is the orientation or positional relationship shown on the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the present invention.
In the description of the present invention, a plurality means two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.
Referring to fig. 1, fig. 1 is a system block diagram of a communication isolation circuit according to an embodiment of the present invention. The communication isolation circuit comprises: the device comprises a first filtering module, a communication isolation module and a second filtering module.
The first filtering module is provided with a first filtering transmission end and a second filtering transmission end and is used for receiving the communication signal output by the main control module and carrying out filtering processing;
the communication isolation module is provided with a first signal transmission end and a second signal transmission end, and the first signal transmission end is connected with the second filtering transmission end;
and the second filtering module is provided with a third filtering transmission end and a fourth filtering transmission end, the third filtering transmission end is connected with the second signal transmission end, and the second filtering module is used for carrying out communication signal interaction with external equipment through the fourth filtering transmission end and carrying out filtering processing on the communication signals.
Referring to fig. 1 to 4, a communication signal sent from the TXD1 of the main control module enters the first filtering module through the first filtering transmission terminal, is filtered by the first filtering module and then transmitted to the first signal transmission terminal through the second filtering transmission terminal, thereby entering the communication isolation module, passes through the communication isolation module and then is transmitted to the third filtering transmission terminal through the second signal transmission terminal, thereby entering the second filtering module, and is transmitted to the external device through the fourth filtering transmission terminal after being filtered again by the second filtering module. The external device may also send a signal to the second filtering module, and the final signal is input from the RXD1 port of the main control module, which is the reverse of the above steps and is not described herein again.
The first filtering module receives the communication signals output by the main control module and then carries out filtering processing on the signals to obtain the communication signals with specific frequency, and then the communication signals are input into the communication isolation module through the second filtering transmission end, the communication isolation module has the advantages of high electromagnetic immunity and low radiation, the communication quality can be improved, the high-voltage surge resistance of a system applying the circuit can be improved, and the construction safety of operators can be guaranteed to a greater extent. The communication signal after passing through the communication isolation module is transmitted to the second filtering module for filtering again, so that the ripple coefficient of the output voltage is reduced, the waveform becomes smoother, and the output voltage is output to external equipment through the fourth filtering transmission end. The whole circuit is simple in structure, and effectively achieves the effect of lower cost on the basis of achieving isolation and filtering.
In some embodiments of the present invention, the main control module is of type PIC18F26K80-1/SS.
In some embodiments of the present invention, referring to fig. 3, the first filtering module includes: the circuit comprises a first resistor R1, a first capacitor C1, a second resistor R2 and a second capacitor C2.
One end of the first resistor R1 is connected with the main control module;
one end of the first capacitor C1 is connected with the other end of the first resistor R1, and the other end of the first capacitor C1 is connected with a ground wire;
one end of the second resistor R2 is connected with the main control module;
and one end of the second capacitor C2 is connected with the other end of the second resistor R2, and the other end of the second capacitor C2 is connected with the ground wire.
The left end of the first resistor R1 is connected with a TXD1 port of the master control module, the right end of the first resistor R1 is connected with the upper end of the first capacitor C1, the lower end of the first capacitor C1 is grounded, the right end of the first resistor R1 is also connected with the communication isolation module, and the first resistor R1 and the first capacitor C1 are used for filtering communication signals output from the master control module. The left end of the second resistor R2 is connected with an RXD1 port of the main control module, the right end of the second resistor R2 is connected with the upper end of the second capacitor C2, the lower end of the second capacitor C2 is connected with a ground wire, the right end of the second resistor R2 is also connected with the communication isolation module, and the second resistor R2 and the second capacitor C2 are used for filtering communication signals input to the main control module from external equipment.
In some embodiments of the present invention, as shown in fig. 4, the communication isolation module includes:
and the isolation transceiver U2 is provided with a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, the first connecting end is connected with the other end of the first resistor R1, the second connecting end is connected with the other end of the second resistor R2, and the third connecting end and the fourth connecting end are both connected with a third filtering transmission end.
The first connecting end 6 of the isolation transceiver U2 is connected with the right end of the first resistor R1, and the second connecting end 3 is connected with the right end of the second resistor R2. The third connection terminal 12 and the fourth connection terminal 13 are respectively connected with a third filtering transmission terminal of the second filtering module.
In some embodiments of the present invention, referring to fig. 1, isolation transceiver U2 employs NSI83085. The model of the isolation transceiver U2 adopted in this embodiment is NSI83085, but this embodiment is not limited to this and may be set reasonably.
In some embodiments of the present invention, referring to fig. 4, the isolation transceiver U2 further has a fifth connection 1 and a sixth connection 16;
the communication isolation module further comprises: a third capacitor C4 and a fourth capacitor C5.
One end of the third capacitor C4 is connected with the power supply, and the other end of the third capacitor C4 is connected with the fifth connecting end 1;
and one end of the fourth capacitor C5 is connected to the power supply, and the other end is connected to the sixth connection terminal 16.
Referring to fig. 4, a third capacitor C4 and a fourth capacitor C5 are filter capacitors for supplying power to the primary side and the secondary side of the isolation transceiver U2, respectively.
In some embodiments of the present invention, as shown in fig. 4, the second filtering module includes: a fifth capacitor C8, a third resistor R8, a sixth capacitor C7 and a fourth resistor R7.
A fifth capacitor C8, one end of which is connected to the third connection terminal 12;
one end of the third resistor R8 is connected with the other end of the fifth capacitor C8, and the other end of the third resistor R8 is connected with external equipment;
one end of the sixth capacitor C7 is connected to the fourth connection end 13, and the other end is connected to one end of the fifth capacitor C8;
and one end of the fourth resistor R7 is connected to one end of the sixth capacitor C7, and the other end is connected to the external device.
The upper end of the fifth capacitor C8 is connected to the third connection end 12, the lower end is connected to the left end of the third resistor R8, the right end of the third resistor R8 is connected to an external device, and the fifth capacitor C8 and the third resistor R8 are used for filtering communication signals output from the main control module to the external device. The upper end of the sixth capacitor C7 is connected with the fourth connection end 13, the lower end of the sixth capacitor C7 is connected with the upper end of the fifth capacitor C8, the left end of the fourth resistor R7 is connected with the upper end of the sixth capacitor C7, and the right end of the fourth resistor R7 is connected with external equipment. The sixth capacitor C7 and the fourth resistor R7 are used for filtering a communication signal input from an external device to the main control module.
In some embodiments of the present invention, as shown in fig. 4, the second filtering module further includes: a fifth resistor R6, a first transient voltage suppressor ZD1 and a second transient voltage suppressor ZD2.
A fifth resistor R6 having one end connected to the third connection terminal 12 and the other end connected to the fourth connection terminal 13;
one end of the first transient voltage suppressor ZD1 is connected with the other end of the third resistor R8, and the other end of the first transient voltage suppressor ZD1 is used for being connected with a ground wire;
and one end of the second transient voltage suppressor ZD2 is connected to the other end of the fourth resistor R7, and the other end is connected to the ground line.
The fifth resistor R6 is connected between the third connecting end 12 and the fourth connecting end 13 and is also connected between the positive end and the negative end of the output, and the fifth resistor R6 serves as a dummy load, so that current exists in a loop, and the anti-interference capacity is improved. The first transient voltage suppressor ZD1 and the second transient voltage suppressor ZD2 are TVS transistors, and can play a role of suppressing an external instantaneous high voltage, thereby avoiding damage to devices.
In some embodiments of the present invention, referring to fig. 1 and 4, the isolation transceiver U2 further has a seventh connection terminal 4 and an eighth connection terminal 8;
the first filtering module further comprises: sixth resistor R3, seventh capacitor C3.
One end of the sixth resistor R3 is connected with the main control module, and the other end of the sixth resistor R3 is connected with the seventh connecting end 4;
and one end of the seventh capacitor C3 is connected to the other end of the sixth resistor R3, and the other end is connected to the eighth connection terminal 8.
The sixth resistor R3 and the seventh capacitor C3 form a filter circuit of the enable signal in the first filter module, and also perform a filtering function.
According to the utility model discloses switching power supply of second aspect embodiment includes the communication isolation circuit as described in the first aspect.
The isolation circuit of the first aspect is applied, the first filtering module receives the communication signals output by the main control module and then filters the signals to obtain the communication signals with specific frequency, and then the communication signals are input to the communication isolation module through the second filtering transmission end, and the communication isolation module has the advantages of high electromagnetic immunity and low radiation, can improve the communication quality, can also improve the high-voltage surge resistance of a system applying the circuit, and can ensure the construction safety of operators to a greater extent. The communication signal after passing through the communication isolation module is transmitted to the second filtering module for filtering again, so that the ripple coefficient of the output voltage is reduced, the waveform becomes smoother, and the output voltage is output to external equipment through the fourth filtering transmission end. The whole circuit is simple in structure, and effectively achieves the effect of lower cost on the basis of achieving isolation and filtering.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (9)
1. A communication isolation circuit, comprising:
the first filtering module is provided with a first filtering transmission end and a second filtering transmission end and is used for receiving the communication signal output by the main control module and carrying out filtering processing;
the communication isolation module is provided with a first signal transmission end and a second signal transmission end, and the first signal transmission end is connected with the second filtering transmission end;
the second filtering module is provided with a third filtering transmission end and a fourth filtering transmission end, the third filtering transmission end is connected with the second signal transmission end, and the second filtering module is used for carrying out communication signal interaction with external equipment through the fourth filtering transmission end and carrying out filtering processing on the communication signals.
2. The communication isolation circuit of claim 1, wherein the first filtering module comprises:
one end of the first resistor is connected with the main control module;
one end of the first capacitor is connected with the other end of the first resistor, and the other end of the first capacitor is used for being connected with a ground wire;
one end of the second resistor is connected with the main control module;
and one end of the second capacitor is connected with the other end of the second resistor, and the other end of the second capacitor is connected with the ground wire.
3. The communication isolation circuit of claim 2, wherein the communication isolation module comprises:
the isolation transceiver is provided with a first connecting end, a second connecting end, a third connecting end and a fourth connecting end, the first connecting end is connected with the other end of the first resistor, the second connecting end is connected with the other end of the second resistor, and the third connecting end and the fourth connecting end are both connected with the third filtering transmission end.
4. The communication isolation circuit of claim 3, wherein the isolation transceiver employs NSI83085.
5. The communication isolation circuit of claim 3, wherein the isolation transceiver further has a fifth connection end and a sixth connection end;
the communication isolation module further comprises:
one end of the third capacitor is connected with a power supply, and the other end of the third capacitor is connected with the fifth connecting end;
and one end of the fourth capacitor is connected with the power supply, and the other end of the fourth capacitor is connected with the sixth connecting end.
6. The communication isolation circuit of claim 5, wherein the second filtering module comprises:
a fifth capacitor, one end of which is connected with the third connection end;
one end of the third resistor is connected with the other end of the fifth capacitor, and the other end of the third resistor is connected with the external equipment;
a sixth capacitor, one end of which is connected to the fourth connection terminal and the other end of which is connected to the one end of the fifth capacitor;
and one end of the fourth resistor is connected with the one end of the sixth capacitor, and the other end of the fourth resistor is connected with the external equipment.
7. The communication isolation circuit of claim 6, wherein the second filtering module further comprises:
one end of the fifth resistor is connected with the third connecting end, and the other end of the fifth resistor is connected with the fourth connecting end;
a first transient voltage suppressor, one end of which is connected with the other end of the third resistor, and the other end of which is used for connecting a ground wire;
and one end of the second transient voltage suppressor is connected with the other end of the fourth resistor, and the other end of the second transient voltage suppressor is connected with the ground wire.
8. The communication isolation circuit of claim 7, wherein the isolation transceiver further has a seventh connection end and an eighth connection end;
the first filtering module further comprises:
one end of the sixth resistor is connected with the main control module, and the other end of the sixth resistor is connected with the seventh connecting end;
and one end of the seventh capacitor is connected with the other end of the sixth resistor, and the other end of the seventh capacitor is connected with the eighth connecting end.
9. A switching power supply comprising a communication isolation circuit as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222355438.4U CN218587174U (en) | 2022-09-05 | 2022-09-05 | Communication isolation circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222355438.4U CN218587174U (en) | 2022-09-05 | 2022-09-05 | Communication isolation circuit and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218587174U true CN218587174U (en) | 2023-03-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222355438.4U Active CN218587174U (en) | 2022-09-05 | 2022-09-05 | Communication isolation circuit and switching power supply |
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| Country | Link |
|---|---|
| CN (1) | CN218587174U (en) |
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2022
- 2022-09-05 CN CN202222355438.4U patent/CN218587174U/en active Active
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