CN110609509A - Modulation circuit of fire-fighting field bus - Google Patents
Modulation circuit of fire-fighting field bus Download PDFInfo
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- CN110609509A CN110609509A CN201910993124.7A CN201910993124A CN110609509A CN 110609509 A CN110609509 A CN 110609509A CN 201910993124 A CN201910993124 A CN 201910993124A CN 110609509 A CN110609509 A CN 110609509A
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 7
- 230000001629 suppression Effects 0.000 claims abstract description 4
- 230000001052 transient effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 9
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 abstract 1
- 230000005693 optoelectronics Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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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
- 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
-
- 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
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21063—Bus, I-O connected to a bus
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electronic Switches (AREA)
Abstract
The invention relates to a modulation circuit of a fire-fighting field bus. The fire-fighting field bus output voltage signal generation circuit is used for generating an output voltage signal of a fire-fighting field bus and comprises a first circuit, a second circuit and a signal acquisition circuit; the first circuit comprises a photoelectric coupler U1, resistors R1-R5, resistors R7-R8, triodes T1-T3, diodes D1-D3 and a voltage stabilizing diode D4; the second circuit comprises a photoelectric coupler U3, resistors R9-R12, a triode T4, a diode D5 and a transient suppression diode D6; the signal acquisition circuit comprises a photoelectric coupler U2, a resistor R6, a resistor RP1 and a light-emitting diode VT 1. The invention has the advantages that the I/O port of the microprocessor is used for controlling the output voltage signal, the high-efficiency voltage pulse output is realized, and the signal output state is detected.
Description
Technical Field
The invention relates to the technical field of fire fighting, in particular to a modulation circuit of a fire fighting field bus.
Background
The fire-fighting field bus generally adopts voltage pulse output modulation signals, adopts a power carrier mode, respectively controls two circuits through a microprocessor to realize the alternate change of the voltage of an output end, and superposes the change of the signals on a direct current output power supply. At present, most of modulation circuits adopt MOSFET tube driving circuits, the circuit implementation is complex, and the space requirement on a printed circuit board is larger, for example, in an Mbus variable differential pressure modulation circuit (patent number: ZL 201721189398.3), an integrated circuit chip and MOSFET tubes are used, so that the layout area of the circuit board is larger.
Disclosure of Invention
Technical problem to be solved
The invention aims to overcome the defects of the prior art, and provides a modulation circuit of a fire fighting field bus, which isolates a microprocessor from an output end through a photoelectric coupler, and provides enough current through a triode, so that the signal isolation of the microprocessor and the output end is realized.
(II) technical scheme
The technical scheme of the invention is as follows: a modulation circuit of a fire fighting field bus comprises a first circuit, a second circuit and a signal acquisition circuit; wherein: the first circuit comprises a photoelectric coupler U1, resistors R1-R5, resistors R7-R8, triodes T1-T3, diodes D1-D3 and a voltage stabilizing diode D4; the input end of the photoelectric coupler U1 is connected with a control power supply VDD and a photoelectric coupler U3 of the second circuit, and the output end of the photoelectric coupler U1 is respectively connected with a power supply VAA, a resistor R5 and a resistor R7; the base of the triode T2 is connected with the resistor R5 and the diode D1, the collector is connected with the resistors R3 and R4, and the emitter is connected to the output end through the diode D2; the base of the triode T1 is connected with the resistor R4, the emitter is connected with the power supply VAA, the resistors R1 and R2, the resistors R1 and R2 are connected in parallel and then connected with the R3, and the collector is connected with the R6 of the signal acquisition circuit; the voltage stabilizing diode D4 is connected with diodes D1 and D3; the base of the triode T3 is connected with resistors R7 and R8, and the collector is connected with a voltage stabilizing diode D4.
The second circuit comprises a photoelectric coupler U3, resistors R9-R12, a triode T4 and a diode D5; the input end of the photoelectric coupler U3 is connected with the photoelectric coupler U1 of the first circuit; the microprocessor I/O port A1 is connected with the input end of a photoelectric coupler U3 through a resistor R10, and the microprocessor I/O port A1 controls voltage signals of an output end P1 and a P2 through the photoelectric coupler U1 and a photoelectric coupler U3 to generate a modulation signal; the output end of the photoelectric coupler U3 is connected with a power supply VAA and a resistor R9; the output end of the photoelectric coupler U3 is connected with a resistor R12, and is connected with a resistor R9 and the base electrode of a triode T4 through a resistor R11; an emitter of the triode T4 is connected with a power supply VAA and is connected to an output end P1 through a diode D5; the collector of the transistor T4 is connected to the output terminal P2 through a transient suppression diode D6.
The signal acquisition circuit comprises a photoelectric coupler U2, a resistor R6, a resistor RP1 and a light-emitting diode VT 1; the input end of a photoelectric coupler U2 is connected with the collector electrode of a triode T1 of the first circuit through a resistor R6 and is connected with an input end power supply VSS through a light emitting diode VT 1; the output end of the photoelectric coupler U2 is connected with a power supply VDD and a microprocessor I/O port B1 through a resistor RP1, and the microprocessor I/O port B1 samples and reads the level.
The output voltage is controlled by the first circuit and the second circuit, and the change of the output voltage is synchronous with the change of the I/O port A1 of the microprocessor.
According to the technical scheme, the number of electronic components is reduced, the triode control mode is adopted, the heat dissipation requirement of a traditional control circuit on a circuit board is reduced, the space constraint on the circuit board is lower, and the electromagnetic compatibility is facilitated.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the present invention.
FIG. 3 is a timing diagram of the microprocessor according to the present invention.
Reference numerals: the circuit comprises a photoelectric coupler U1, a photoelectric coupler U2, a photoelectric coupler U3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor RP1, a triode T1, a triode T2, a triode T3, a triode T4, a diode D1, a diode D2, a diode D3, a zener diode D4, a diode D5, a transient suppression diode D6 and a microprocessor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, when the circuit works, the first circuit and the second circuit do not output to the outside at the same time, the second circuit does not work when the first circuit works, the first circuit does not work when the second circuit works, the output voltage follows the first circuit and the second circuit, the signal input microprocessor signal of the signal acquisition circuit reflects the working state of the first circuit and the second circuit.
Referring to fig. 2, when the microprocessor I/O port a1 outputs a high level, the voltage difference between the input terminals of the photocouplers U1 and U3 is insufficient, and the microprocessor cannot be turned on; the photoelectric coupler U1 in the first circuit is not conducted to work, at the moment, conduction voltage drop and base current cannot be provided to the base electrode-emitter of the triode T2 and the base electrode-emitter of the triode T3, and the triode T2 and the triode T3 cannot be conducted to work; the transistor T1 is not conducting and the first circuit does not output. In the second circuit, the photoelectric coupler U3 is not conducted to work, a power supply VAA divides voltage to work through a resistor R9 and resistors R11 and R12 to provide base current of a triode T4, a triode T4 is conducted to work, a collector of the triode T4 is connected with an output end, the output is high voltage, and an output end diode D6 forms reverse protection; the output end is connected with a power supply VAA through a diode D5 to prevent reverse conduction, and the second circuit outputs voltage to the output end. Referring to fig. 3, the end a1 of the I/O port of the microprocessor outputs a high level, the input end of the optoelectronic coupler U2 in the signal acquisition circuit is connected to the transistor T1 through the resistor R6, the transistor T1 is not turned on, the optoelectronic coupler U2 is not turned on to work, the end B1 of the I/O port of the microprocessor is connected to VDD through the resistor RP1, and the end B1 inputs a high level, which is the same as the end a1 of the I/O port of the microprocessor.
Referring to fig. 2, the terminal a1 of the microprocessor outputs low level, and the photocouplers U1 and U3 are turned on; the output end of a photoelectric coupler U1 in the first circuit is conducted to work, the photoelectric coupler U1 provides base current of a triode T3 after voltage division is carried out through resistors R7 and R8, the triode T3 is conducted to work, the base voltage of T3 is 0.5V, the collector voltage is 0.3V, the emitter end of the photoelectric coupler U1 is connected with the triode T3 through a resistor R5, a diode D1 and a zener diode D4, the triode T3 is conducted to work, the base voltage of the triode T2 is clamped by the zener diode D4 and the diode D1 to be low voltage, the triode T2 is conducted to work, the base-emitter voltage drop of the triode T2 and the diode D2 are connected to the output end, the low voltage value is output, and the first circuit; the input end of a photoelectric coupler U3 in the second circuit is conducted to work, the output end is conducted, a power supply VAA is connected with R12 through a photoelectric coupler U3, the voltage value of an emitter end (No. 3 pin) of the photoelectric coupler U3 is (VAA-0.5) V, after the VAA passes through a resistor R9 and a resistor R11, the base voltage of a triode T4 is higher than (VAA-0.5) V, the conduction voltage drop is insufficient, the triode T4 is not conducted to work, and the second circuit does not output to the output end; referring to fig. 3, the end a1 of the I/O port of the microprocessor outputs a low level, the input end of the optoelectronic coupler U2 in the signal acquisition circuit is connected to the transistor T1 through the resistor R6, the transistor T1 is conducted and operates in the first circuit, the input end of the optoelectronic coupler U2 is conducted, the output end is conducted and operates, the end B1 of the I/O port of the microprocessor is connected to GND through the collector-emitter of the optoelectronic coupler U2, and the end B1 inputs a low level, which is the same as the level of the I/O port of the microprocessor at the end a 1.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A modulation circuit of a fire fighting field bus comprises a first circuit, a second circuit and a signal acquisition circuit; the method is characterized in that: the input ends of the first circuit and the second circuit are respectively connected with an I/O port of the microprocessor, the output voltage follows the first circuit and the second circuit, and the signal acquisition circuit acquires the output voltage and is connected with the I/O port of the microprocessor.
2. A first circuit according to claim 1; the photoelectric coupler is characterized by comprising a photoelectric coupler U1, resistors R1-R5, resistors R7-R8, triodes T1-T3, diodes D1-D3 and a voltage stabilizing diode D4; the input end of the photoelectric coupler U1 is connected with a control power supply VDD and a photoelectric coupler U3 of the second circuit, and the output end of U1 is respectively connected with a power supply VAA, a resistor R5 and a resistor R7; the base of the triode T2 is connected with the resistor R5 and the diode D1, the collector is connected with the resistors R3 and R4, and the emitter is connected to the output end P1 through the diode D2; the base electrode of the triode T1 is connected with the resistor R4, the emitter electrode is connected with the power supply VAA, the resistor R1 and the resistor R2, and the collector electrode is connected with the R6 of the signal acquisition circuit; the voltage stabilizing diode D4 is connected with diodes D1 and D3; the base of the triode T3 is connected with resistors R7 and R8, and the collector is connected with a voltage stabilizing diode D4.
3. A first circuit according to claim 2; the method is characterized in that: the resistor R1 is connected with the resistor R2 in parallel and then connected with the resistor R3.
4. A first circuit according to claim 2; the method is characterized in that: one end of the resistor R8 is connected with the base level of the triode T3, and the other end is connected with the emitter of the triode T3.
5. The second circuit of claim 1, comprising a photocoupler U3, resistors R9-R12, a transistor T4, a diode D5; the input end of the photoelectric coupler U3 is connected with the photoelectric coupler U1 of the first circuit; the I/O port of the microprocessor is connected with the input end of a photoelectric coupler U3 through a resistor R10, and the output end of the photoelectric coupler U3 is respectively connected with a power supply VAA and a resistor R9; the output end of the photoelectric coupler U3 is connected with a resistor R12, and is connected with R9 and the base electrode of a triode T4 through a resistor R11; an emitter of the triode T4 is connected with a power supply VAA and is connected to an output end P1 through a diode D5; the collector of the transistor T4 is connected to the output terminal P2 through a transient suppression diode D6.
6. The second circuit of claim 5, wherein: one end of the resistor R11 is connected with the base of the triode T4, and the other end is connected with the resistor R12.
7. The signal acquisition circuit of claim 1, comprising a photocoupler U2, a resistor R6, a resistor RP1, a light emitting diode VT 1; the input end of a photoelectric coupler U2 is connected with the collector electrode of a triode T1 of the first circuit through a resistor R6 and is connected with an input end power supply VSS through a light emitting diode VT 1; the output end of the photoelectric coupler U2 is connected with a power supply VDD and an I/O port of the microprocessor through a resistor RP 1.
8. A fire fighting fieldbus modulation circuit as claimed in any one of claims 1, 2 and 5, wherein: the microprocessor I/O port controls the first circuit and the second circuit through the photoelectric coupler U1 and the photoelectric coupler U3, outputs voltage signals to the output ends P1 and P2, and generates modulation signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910993124.7A CN110609509A (en) | 2019-10-18 | 2019-10-18 | Modulation circuit of fire-fighting field bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910993124.7A CN110609509A (en) | 2019-10-18 | 2019-10-18 | Modulation circuit of fire-fighting field bus |
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| Publication Number | Publication Date |
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| CN110609509A true CN110609509A (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910993124.7A Pending CN110609509A (en) | 2019-10-18 | 2019-10-18 | Modulation circuit of fire-fighting field bus |
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| CN (1) | CN110609509A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393777A (en) * | 2011-11-22 | 2012-03-28 | 江苏迈拓智能仪表有限公司 | Instrument bus protocol based data communication device and method |
| CN203934040U (en) * | 2014-04-30 | 2014-11-05 | 蚌埠依爱消防电子有限责任公司 | A kind of communication interface arrangement for emergency lighting |
| CN204794950U (en) * | 2015-07-25 | 2015-11-18 | 浙江金控电气有限公司 | Buffering fire control drive circuit |
| CN105356566A (en) * | 2015-11-20 | 2016-02-24 | 六安市同心畅能电子科技有限公司 | Fire-protection electronic device and emergency lamp standby battery automatic charging control circuit |
| WO2016041123A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Open-circuit detection circuit for led emergency lamp power supply |
| US9609713B1 (en) * | 2015-12-23 | 2017-03-28 | Zhuhai Shengchang Electronics Co., Ltd. | Kind of pulse width dimming control circuit for LED phase cut dimming power supply |
| CN210666418U (en) * | 2019-10-18 | 2020-06-02 | 九江中船消防设备有限公司 | Modulation circuit of fire-fighting field bus |
-
2019
- 2019-10-18 CN CN201910993124.7A patent/CN110609509A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393777A (en) * | 2011-11-22 | 2012-03-28 | 江苏迈拓智能仪表有限公司 | Instrument bus protocol based data communication device and method |
| CN203934040U (en) * | 2014-04-30 | 2014-11-05 | 蚌埠依爱消防电子有限责任公司 | A kind of communication interface arrangement for emergency lighting |
| WO2016041123A1 (en) * | 2014-09-15 | 2016-03-24 | 深圳市聚作照明股份有限公司 | Open-circuit detection circuit for led emergency lamp power supply |
| CN204794950U (en) * | 2015-07-25 | 2015-11-18 | 浙江金控电气有限公司 | Buffering fire control drive circuit |
| CN105356566A (en) * | 2015-11-20 | 2016-02-24 | 六安市同心畅能电子科技有限公司 | Fire-protection electronic device and emergency lamp standby battery automatic charging control circuit |
| US9609713B1 (en) * | 2015-12-23 | 2017-03-28 | Zhuhai Shengchang Electronics Co., Ltd. | Kind of pulse width dimming control circuit for LED phase cut dimming power supply |
| CN210666418U (en) * | 2019-10-18 | 2020-06-02 | 九江中船消防设备有限公司 | Modulation circuit of fire-fighting field bus |
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