CN113964641A - Signal input circuit of laser control circuit - Google Patents
Signal input circuit of laser control circuit Download PDFInfo
- Publication number
- CN113964641A CN113964641A CN202010702083.4A CN202010702083A CN113964641A CN 113964641 A CN113964641 A CN 113964641A CN 202010702083 A CN202010702083 A CN 202010702083A CN 113964641 A CN113964641 A CN 113964641A
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- circuit
- emi filter
- signal
- laser control
- connector
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- 230000008054 signal transmission Effects 0.000 claims abstract description 19
- 230000007257 malfunction Effects 0.000 claims description 12
- 230000002265 prevention Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser
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- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
Abstract
The invention discloses a signal input circuit of a laser control circuit, which is connected with a control chip of the laser control circuit and comprises a connector and a plurality of signal transmission circuits, wherein each signal transmission circuit is respectively connected with one port of the connector, each signal transmission circuit comprises an EMI filter circuit, an error action preventing circuit, a voltage division circuit and an amplitude limiting protection circuit, the EMI filter circuit is connected with one port of the connector, the error action preventing circuit and the voltage division circuit, and the voltage division circuit is connected with the amplitude limiting protection circuit and the control chip. The invention utilizes the anti-electromagnetic interference capability of the EMI filter circuit as the middle part of the input and the output of the circuit system, thereby achieving the purpose of realizing the electromagnetic compatibility capability of the circuit system; the false action preventing circuit is utilized to ensure the certainty of the level of the system signal when no external input signal exists, and the amplitude limiting protection circuit is adopted to ensure that the input and output ranges of the system are stabilized at-0.3V-5.3V.
Description
Technical Field
The invention relates to the technical field of laser control, in particular to a signal input circuit of a laser control circuit.
Background
In a signal input circuit of a laser control circuit, signals such as voltage, temperature, pulse and the like of a system sometimes need to be monitored, and at the moment, various non-voltage signals need to be converted into voltage signals which change within a certain range for monitoring, so that whether the system is in a normal working state or not is judged. However, in the existing laser control circuit, a signal to be detected is generally directly input to a control part of the laser control circuit, so that the input signal is not stable enough, the monitoring error is increased, and the judgment of the system is influenced.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, an object of the present invention is to provide a signal input circuit of a laser control circuit, which has an electromagnetic compatibility function and a stable input/output signal range, ensures the robustness of the circuit system, cannot be easily interfered by an externally changing signal, and ensures the accuracy of system judgment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a signal input circuit of a laser control circuit is connected with a control chip of the laser control circuit and comprises a connector and a plurality of signal transmission circuits, wherein each signal transmission circuit is respectively connected with one port of the connector, each signal transmission circuit comprises an EMI filter circuit, a malfunction prevention circuit, a voltage division circuit and an amplitude limiting protection circuit, the EMI filter circuit is connected with one port of the connector, the malfunction prevention circuit and the voltage division circuit, the voltage division circuit is connected with the amplitude limiting protection circuit and the control chip, wherein,
the EMI filter circuit is used for filtering an input signal; the misoperation preventing circuit is used for preventing misoperation caused by high-level interference; the voltage division circuit is used for carrying out voltage division processing on an input signal; the amplitude limiting protection circuit is used for carrying out amplitude limiting processing on the input signal so as to enable the voltage of the input signal to be maintained within a preset range.
Compared with the prior art, the signal input circuit of the laser control circuit provided by the invention utilizes the anti-electromagnetic interference capability of the EMI filter circuit as the middle part of the input and output of the circuit system, so that the circuit system realizes the electromagnetic compatibility capability; the false action preventing circuit is utilized to ensure the certainty of the level of the system signal when no external input signal exists, and the amplitude limiting protection circuit is adopted to ensure that the input and output ranges of the system are stabilized at-0.3V-5.3V.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of a signal input circuit of a laser control circuit according to the present invention;
fig. 2 is a schematic diagram of a preferred embodiment of the signal transmission circuit in the signal input circuit of the laser control circuit according to the present invention.
Detailed Description
The present invention provides a signal input circuit of a laser control circuit, which is described in further detail below with reference to the accompanying drawings and examples in order to make the objects, technical solutions and effects of the present invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a single-channel signal input circuit for laser control according to an embodiment of the present invention is connected to a control chip (not shown in the figure) of the laser control circuit, and includes a connector 1 and a plurality of signal transmission circuits 2, each of the signal transmission circuits 2 is connected to a port of the connector 1, each of the signal transmission circuits 2 includes an EMI filter circuit 21, a malfunction prevention circuit 22, a voltage divider circuit 23, and an amplitude limiting protection circuit 24, the EMI filter circuit 21 is connected to a port of the connector 1, the malfunction prevention circuit 22, and the voltage divider circuit 23 is connected to the amplitude limiting protection circuit 24 and the control chip.
Specifically, the connector 1 is used for connecting input or output signals, and at the same time, states of ports of the connector may be different, for example, some ports are used as signal output ports, and some ports are used as signal input ports, which is not limited by the present invention, and in a specific implementation, the connector 1 employs an RJ45 connector; the EMI filter circuit 21 is configured to perform filtering processing on an input signal to filter interference of an external high-frequency pulse on the input signal, and also reduce electromagnetic interference of the input signal itself on the outside, so that the signal input circuit has a higher electromagnetic compatibility; the malfunction prevention circuit 22 is used to prevent malfunction caused by high-level interference; the voltage division circuit 23 is used for carrying out voltage division processing on an input signal, so that electric elements in the circuit are protected from overvoltage damage; the amplitude limiting protection circuit 24 is used for performing amplitude limiting processing on an input signal so as to maintain the voltage of the input signal within a preset range, specifically, the input signal can be stabilized within a range of-0.3V to 5.3V, and the target voltage range detected by the system is within 0V to 5V, so that the design requirement can be accurately achieved within a reasonable range, and an overvoltage protection effect can be achieved, so that the whole circuit system is more stable.
In other words, the invention utilizes the anti-electromagnetic interference capability of the EMI filter circuit 21 as the middle part of the input and output of the circuit system, so as to realize the electromagnetic compatibility capability of the circuit system; the malfunction preventing circuit 22 is utilized to ensure the certainty of the level of the system signal when no external input signal exists, the voltage dividing circuit 23 is utilized to ensure that the electric elements in the circuit can not be damaged by overvoltage, and the voltage dividing circuit has a protection function, and the amplitude limiting protection circuit 24 is utilized to ensure that the input and output range of the system is stabilized at-0.3V-5.3V.
In a preferred embodiment, the number of the signal transmission circuits is at least 6, and the signal transmission circuits are respectively a reference voltage transmission circuit, a laser working signal transmission circuit, a temperature transmission circuit, a working voltage transmission circuit, a connector pin detection signal transmission circuit and a control signal transmission circuit.
Referring to fig. 2, the EMI filter circuit 21 includes an EMI filter U1, one end of the EMI filter U1 is connected to one port of the connector 1, the other end of the EMI filter U1 is connected to the malfunction prevention circuit 22 and the voltage divider circuit 23, and the ground terminal of the EMI filter U1 is grounded. The EMI filter U1 mainly acts to make the external high-frequency pulse interfere the input signal, and simultaneously reduces the electromagnetic interference of the input signal itself to the outside, so that the circuit of the invention has good electromagnetic compatibility design effect.
Referring to fig. 2, the malfunction prevention circuit 22 includes a first resistor R1, one end of the first resistor R1 is connected to the other end of the EMI filter U1 and the voltage divider circuit 23, and the other end of the first resistor R1 is grounded. The first resistor R1 is a pull-down resistor, and is grounded through the pull-down resistor, so that the signal end can be stably in a low level state when no high level is input, and the malfunction of a circuit system caused by the possible high level interference is prevented.
With reference to fig. 2, the voltage divider 23 includes a second resistor R2, one end of the second resistor R2 is connected to the other end of the EMI filter U1 and one end of the first resistor R1, and the other end of the second resistor R2 is connected to the control chip and the slice protection circuit 24. Second resistance R2 is divider resistance, through series connection divider resistance, can play partial pressure and current-limiting's effect, when connector 1 inserts too high voltage from the external world mistake, can play the protective circuit effect.
With reference to fig. 2, the slice protection circuit 24 includes a switching diode U2, a third pin of the switching diode U2 is connected to the other end of the second resistor R2, a first pin of the switching diode U2 is grounded, and a second pin of the switching diode U2 is connected to the power supply. Specifically, the switching diode U2 is a BAV99 switching diode, the input voltage and the output voltage of the system can be stabilized within a range of-0.3V-5.3V through the switching diode BAV99, the target voltage range of system detection is 0-5V, and the design requirement is exactly met within a reasonable range. In addition, because the connector has an external input end, if the port is inserted with an excessively high power supply voltage from the outside, the overvoltage protection effect is realized on the system through the amplitude limitation of the switching diode BAV99 and the voltage division of the series-connected voltage division resistor, so that the whole circuit system is more stable.
In summary, the signal input circuit of the laser control circuit provided by the invention utilizes the anti-electromagnetic interference capability of the EMI filter circuit as the middle part of the input and output of the circuit system, so as to achieve the purpose that the circuit system realizes the electromagnetic compatibility capability; the false action preventing circuit is utilized to ensure the certainty of the level of the system signal when no external input signal exists, and the amplitude limiting protection circuit is adopted to ensure that the input and output ranges of the system are stabilized at-0.3V-5.3V.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (8)
1. A signal input circuit of a laser control circuit is connected with a control chip of the laser control circuit, and is characterized by comprising a connector and a plurality of signal transmission circuits, wherein each signal transmission circuit is respectively connected with a port of the connector, each signal transmission circuit comprises an EMI filter circuit, an error action preventing circuit, a voltage division circuit and an amplitude limiting protection circuit, the EMI filter circuit is connected with a port of the connector, the error action preventing circuit and the voltage division circuit, the voltage division circuit is connected with the amplitude limiting protection circuit and the control chip, wherein,
the EMI filter circuit is used for filtering an input signal; the misoperation preventing circuit is used for preventing misoperation caused by high-level interference; the voltage division circuit is used for carrying out voltage division processing on an input signal; the amplitude limiting protection circuit is used for carrying out amplitude limiting processing on the input signal so as to enable the voltage of the input signal to be maintained within a preset range.
2. The signal input circuit of the laser control circuit according to claim 1, wherein at least 6 of the signal transmission circuits are provided.
3. The signal input circuit of the laser control circuit according to claim 1, wherein the EMI filter circuit includes an EMI filter, one end of the EMI filter is connected to one port of the connector, the other end of the EMI filter is connected to the malfunction prevention circuit and the voltage divider circuit, and a ground terminal of the EMI filter is grounded.
4. The signal input circuit of claim 3, wherein the malfunction prevention circuit comprises a first resistor, one end of the first resistor is connected to the other end of the EMI filter and the voltage divider circuit, and the other end of the first resistor is grounded.
5. The signal input circuit of the laser control circuit according to claim 4, wherein the voltage divider circuit comprises a second resistor, one end of the second resistor is connected to the other end of the EMI filter and one end of the first resistor, and the other end of the second resistor is connected to the control chip and the slice protection circuit.
6. The signal input circuit of the laser control circuit as claimed in claim 5, wherein the clipping protection circuit comprises a switch diode, a third pin of the switch diode is connected to the other end of the second resistor, a first pin of the switch diode is connected to ground, and a second pin of the switch diode is connected to the power supply.
7. The signal input circuit of the laser control circuit according to claim 6, wherein the switching diode is a BAV99 switching diode.
8. The signal input circuit of the laser control circuit of claim 1, wherein the connector is an RJ45 connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010702083.4A CN113964641A (en) | 2020-07-20 | 2020-07-20 | Signal input circuit of laser control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010702083.4A CN113964641A (en) | 2020-07-20 | 2020-07-20 | Signal input circuit of laser control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113964641A true CN113964641A (en) | 2022-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010702083.4A Pending CN113964641A (en) | 2020-07-20 | 2020-07-20 | Signal input circuit of laser control circuit |
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| CN (1) | CN113964641A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09246641A (en) * | 1996-03-13 | 1997-09-19 | Nec Corp | Clipping distortion control circuit |
| JP2004208043A (en) * | 2002-12-25 | 2004-07-22 | Denso Corp | Digital input signal processing device |
| KR101551669B1 (en) * | 2015-06-05 | 2015-09-09 | 서울대학교산학협력단 | Interface device |
| CN204652223U (en) * | 2015-05-21 | 2015-09-16 | 常州信息职业技术学院 | A kind of single-ended flyback small-power switching power-supply |
| CN105577169A (en) * | 2015-12-11 | 2016-05-11 | 中国北方发动机研究所(天津) | Vehicle-used wide-range voltage switching quantity input circuit |
| JP2019149770A (en) * | 2018-02-28 | 2019-09-05 | 株式会社東芝 | Limiter circuit |
-
2020
- 2020-07-20 CN CN202010702083.4A patent/CN113964641A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09246641A (en) * | 1996-03-13 | 1997-09-19 | Nec Corp | Clipping distortion control circuit |
| JP2004208043A (en) * | 2002-12-25 | 2004-07-22 | Denso Corp | Digital input signal processing device |
| CN204652223U (en) * | 2015-05-21 | 2015-09-16 | 常州信息职业技术学院 | A kind of single-ended flyback small-power switching power-supply |
| KR101551669B1 (en) * | 2015-06-05 | 2015-09-09 | 서울대학교산학협력단 | Interface device |
| CN105577169A (en) * | 2015-12-11 | 2016-05-11 | 中国北方发动机研究所(天津) | Vehicle-used wide-range voltage switching quantity input circuit |
| JP2019149770A (en) * | 2018-02-28 | 2019-09-05 | 株式会社東芝 | Limiter circuit |
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Application publication date: 20220121 |