CN102281083A - Current-loop communication circuit for photovoltaic system - Google Patents
Current-loop communication circuit for photovoltaic system Download PDFInfo
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- CN102281083A CN102281083A CN2011102116348A CN201110211634A CN102281083A CN 102281083 A CN102281083 A CN 102281083A CN 2011102116348 A CN2011102116348 A CN 2011102116348A CN 201110211634 A CN201110211634 A CN 201110211634A CN 102281083 A CN102281083 A CN 102281083A
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Abstract
The invention relates to a current-loop communication circuit for a photovoltaic system. The invention relates to the current-loop communication circuit, in particular to a communication system for mini type, grid connected inverter and a digital photovoltaic combiner box, and the whole communication comprises a primary communication unit and a slave communication which are approximately symmetrical, and a communication line. The hardware format of the circuit adopts an UART (Universal Asynchronous Receiver/Transmitter) communication mode, and transmits signals by controlling the current status (ON or OFF) in the circuit, and regulates that: the current ON status in the loop is 1, namely the transmit port is low level, and the receive port is high level; the current OFF status in the loop is 0, namely the transmit port is high level, and the receive port is low level. By adopting the above structure, the one-to-many communication can be realized, the whole system has the advantages that the structure is simple, the reliability is high, and the anti-interference ability is strong.
Description
Technical field
The present invention relates to a kind of electric current loop communicating circuit, the communication system of particularly a kind of miniature photovoltaic combining inverter and photovoltaic numeral header box.
Background technology
When a plurality of miniature photovoltaic combining inverters or photovoltaic numeral header box composition distributed generation system, system needs the information of each miniature combining inverter of real-time collecting or photovoltaic numeral header box, to realize effectively monitoring and to manage.Therefore need low cost, efficient, high reliability ICT (information and communication technology) as assurance, can utilize the communication technology to comprise RS232 at present, power line carrier PLC etc., RS232 can only realize communication one to one, and under adverse circumstances, be subject to disturb, can only short distance communication.PLC links to each other with utility grid, has unsafe factor, and autgmentability is relatively poor.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of security performance height and can realize the electric current loop communicating circuit of one-to-many communication.
For solving above-mentioned technical problem, the electric current loop communicating circuit of photovoltaic generating system of the present invention comprises a main communication unit and some from communication unit,
Described main communication unit comprises transmitting terminal and receiving terminal, described transmitting terminal is connected with the reception optocoupler with the transmission optocoupler respectively with receiving terminal, described transmitting terminal links to each other with the negative pole that sends the optocoupler light-emitting diode, and described receiving terminal links to each other with the emitter of accepting the optocoupler phototriode; The positive pole of described transmission optocoupler light-emitting diode links to each other with power supply, and the emitter of described transmission optocoupler phototriode links to each other with the positive pole of accepting the optocoupler light-emitting diode, and the collector electrode of described transmission optocoupler phototriode links to each other with common port; The described negative pole of accepting the optocoupler light-emitting diode links to each other with the active end negative pole of electric current loop; The described collector electrode of accepting the optocoupler phototriode links to each other with power supply, the described grounded emitter of accepting the optocoupler phototriode;
Describedly comprise transmitting terminal and receiving terminal from communication unit, described transmitting terminal and receiving terminal respectively with send optocoupler and accept optocoupler and be connected, described transmitting terminal links to each other with the negative pole that sends the optocoupler light-emitting diode, and described receiving terminal links to each other with the emitter of accepting the optocoupler phototriode; The positive pole of described transmission optocoupler light-emitting diode links to each other with power supply, and the emitter of described transmission optocoupler phototriode links to each other with common port; The described series circuit of optocoupler light-emitting diode negative pole by diode and divider resistance of accepting extremely links to each other with active the rectifying of electric current loop; The described emitter of accepting the optocoupler phototriode links to each other with power supply, the described grounded collector of accepting the optocoupler phototriode.
Said structure has adopted optocoupler to carry out the transmission of signal, realized master control communication unit, communication signal transmit ring, isolated from the safety between the control communication unit, and improved antijamming capability, the more important thing is, when signal transmits, there is electric current to exist in the communication loop all the time, current loop circuit becomes to be as the criterion, thereby make antijamming capability further strengthen, and the operating state of circuit is more optimized.Characteristics simple in structure, that reliability is high, antijamming capability is strong that whole communication device has.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is a main communication unit structural representation of the present invention.
Fig. 2 is of the present invention from the communication unit structural representation.
Among the figure: 101 is transmitting terminal, and 102 is receiving terminal, and 103 for sending optocoupler, and 104 for receiving optocoupler, and 105 is resistance, and 106 is power supply, and 107 is resistance, and 108 is resistance, and 109 is blocking diode, and 110 is blocking diode,
201 is transmitting terminal, and 202 is receiving terminal, and 203 for sending optocoupler, 204 for receiving optocoupler, and 205 is resistance, and 206 is power supply, 207 is resistance, and 208 is resistance, and 209 is resistance, 210 is resistance, 211 is diode, and 212 is blocking diode, and 213 is electric capacity, 214 is voltage stabilizing didoe, and 215 is blocking diode
Embodiment
The electric current loop communicating circuit of photovoltaic generating system of the present invention comprises a main communication unit and some from communication unit,
As shown in Figure 1, described main communication unit comprises transmitting terminal 101 and receiving terminal 102, described transmitting terminal 101 is connected with reception optocoupler 104 with transmission optocoupler 103 respectively with receiving terminal 102, described transmitting terminal 101 links to each other with the negative pole that sends optocoupler 103 light-emitting diodes, and described receiving terminal 102 links to each other with the emitter of accepting optocoupler 104 phototriodes; The positive pole of described transmission optocoupler 103 light-emitting diodes links to each other with power supply 106, the emitter of described transmission optocoupler 103 phototriodes links to each other with the positive pole of accepting optocoupler 104 light-emitting diodes, and the collector electrode of described transmission optocoupler 103 phototriodes links to each other with common port 01; The described negative pole of accepting optocoupler 104 light-emitting diodes links to each other with the active end negative pole 02 of electric current loop; The described collector electrode of accepting optocoupler 104 phototriodes links to each other the described grounded emitter of accepting optocoupler 104 phototriodes with power supply 106;
Describedly comprise transmitting terminal 201 and receiving terminal 202 from communication unit, described transmitting terminal 201 and receiving terminal 202 respectively with send optocoupler 203 and accept optocoupler 204 and be connected, described transmitting terminal 201 links to each other with the negative pole that sends optocoupler 203 light-emitting diodes, and described receiving terminal 202 links to each other with the emitter of accepting optocoupler 204 phototriodes; The positive pole of described transmission optocoupler 203 light-emitting diodes links to each other with power supply 206, and the emitter of described transmission optocoupler 203 phototriodes links to each other with common port 01; The described series circuit of optocoupler 204 light-emitting diode negative poles by diode 211 and divider resistance 210 of accepting links to each other with the active proper utmost point 03 of electric current loop; The described emitter of accepting optocoupler 204 phototriodes links to each other the described grounded collector of accepting optocoupler 204 phototriodes with power supply 206.
Described main communication unit is a dead terminal, and described is active end from communication unit.
Describedly be connected with voltage-stabiliser tube 214 between communication unit diode 211 negative poles and the active end negative pole 02 of electric current loop, described voltage-stabiliser tube 214 two ends are parallel with electric capacity 213.When active end is input as alternating current, electric capacity 213 plays a supportive role, and will be stable direct current through the filter of rectifier 211 postwaves; When active end was input as direct current, capacitance was optional little, made after divider resistance 210 dividing potential drops voltage ripple littler, and the effect of voltage-stabiliser tube 214 is to stablize this point voltage, makes communication more reliable.
Choosing of described divider resistance 210 from communication unit is relevant with the power supply of active end, is to guarantee reliability and precision, can use a plurality of resistance series connection, and the resistance size is current related with whole series loop, should guarantee light lotus root 203 and 204 reliable conductings.
Described have between far-end negative pole 02 and the common port 01 from the communication unit electric current loop be connected with blocking diode 212, play the effect that connects and protect of putting back.
Be connected with resistance 209 between the described both positive and negative polarity that receives optocoupler 204 light-emitting diodes from communication unit; The described reception between the collector electrode of optocoupler 204 phototriodes and the ground from communication unit is connected with resistance 207; The described transmission between the negative pole of optocoupler 203 light-emitting diodes and the transmitting terminal 201 from communication unit is connected with resistance 205.Resistance 205,207,209 play the effect of current-limiting protection, can guarantee the reliable conducting of optocoupler on the one hand, limit the on state current of order circuit on the other hand.
Described from being connected with the series circuit of circuit 208 and blocking diode 215 between communication unit transmission optocoupler 203 phototriodes and the common port 01, mainly be to play effect anti-reverse and protection.
Be connected with resistance 108 between collector electrode that described main communication unit transmission optocoupler 103 photosensitive three is taken over and the common port 01; Be connected with resistance 105 between the negative pole of described main communication unit transmission optocoupler 103 light-emitting diodes and the transmitting terminal 101; Described main communication unit receives between optocoupler 104 phototriode emitters and the ground and is connected with resistance 107.Resistance 105,107,108 effects that equally have been used for current-limiting protection can guarantee the reliable conducting of optocoupler on the one hand, limit the on state current of order circuit on the other hand.
Be connected with blocking diode 110 between described main communication unit common port 01 and the active end negative pole 02 of electric current loop; Described main communication unit receives between optocoupler 104 light-emitting diode negative poles and the active end negative pole 02 of electric current loop and is connected with blocking diode 109.Blocking diode 109,110 plays effect anti-reverse and protection.
The active end of described electric current loop is an AC network, is in the circuit of AC network at the active end of electric current loop, and the effect of diode 211 is rectifications.
The active end of described electric current loop is a dc bus, is in the circuit of dc bus at the active end of electric current loop, and the effect of diode 211 is anti-reverse.
The Principle of Communication of entire circuit is as follows: it is low that main communication unit is at first controlled receiving terminal 102 port level,, concerns thereby set up communication to sending data from communication unit by transmitting terminal 101.When communication stopped, transmitting terminal 101 was in high level always, and this moment, the communication loop no current flow through; When master control communication unit transmitting terminal 101 sends signals, be low level from control unit transmitting terminal 201 always, form accurate current loop this moment and realized from the signal reception of control communication unit receiving terminal 202; When main communication unit transmitting terminal 201 is kept low level always, during from control communication unit transmitting terminal 101 transmission signals, formed accurate current loop this moment and realized that the signal of main communication unit receiving terminal 102 receives, thereby realized half duplex communication.
Claims (10)
1. the electric current loop communicating circuit of a photovoltaic generating system comprises a main communication unit and some from communication unit, it is characterized in that:
Described main communication unit comprises transmitting terminal (101) and receiving terminal (102), described transmitting terminal (101) is connected with reception optocoupler (104) with transmission optocoupler (103) respectively with receiving terminal (102), described transmitting terminal (101) links to each other with the negative pole that sends optocoupler (103) light-emitting diode, and described receiving terminal (102) links to each other with the emitter of accepting optocoupler (104) phototriode; The positive pole of described transmission optocoupler (103) light-emitting diode links to each other with power supply (106), the emitter of described transmission optocoupler (103) phototriode links to each other with the positive pole of accepting optocoupler (104) light-emitting diode, and the collector electrode of described transmission optocoupler (103) phototriode links to each other with common port (01); The described negative pole of accepting optocoupler (104) light-emitting diode links to each other with the active end negative pole of electric current loop (02); The described collector electrode of accepting optocoupler (104) phototriode links to each other the described grounded emitter of accepting optocoupler (104) phototriode with power supply (106);
Describedly comprise transmitting terminal (201) and receiving terminal (202) from communication unit, described transmitting terminal (201) and receiving terminal (202) respectively with send optocoupler (203) and accept optocoupler (204) and be connected, described transmitting terminal (201) links to each other with the negative pole that sends optocoupler (203) light-emitting diode, and described receiving terminal (202) links to each other with the emitter of accepting optocoupler (204) phototriode; The positive pole of described transmission optocoupler (203) light-emitting diode links to each other with power supply (206), and the emitter of described transmission optocoupler (203) phototriode links to each other with common port (01); Described reception optocoupler (204) light-emitting diode negative pole links to each other with the active proper utmost point of electric current loop (03) by the series circuit of diode (211) and divider resistance (210); The described emitter of accepting optocoupler (204) phototriode links to each other the described grounded collector of accepting optocoupler (204) phototriode with power supply (206).
2. according to the electric current loop communicating circuit of the described photovoltaic generating system of claim 1, it is characterized in that: described main communication unit is a dead terminal, and described is active end from communication unit.
3. according to the electric current loop communicating circuit of the described photovoltaic generating system of claim 1, it is characterized in that: describedly be connected with voltage-stabiliser tube (214) between communication unit diode (211) negative pole and the active end negative pole of electric current loop (02), described voltage-stabiliser tube (214) two ends are parallel with electric capacity (213).
4. according to the electric current loop communicating circuit of the described photovoltaic generating system of claim 1, it is characterized in that: describedly between active end negative pole of communication unit electric current loop (02) and common port (01), be connected with blocking diode (212).
5. according to the electric current loop communicating circuit of the described photovoltaic generating system of claim 1, it is characterized in that: be connected with resistance (209) between the described both positive and negative polarity that receives optocoupler (204) light-emitting diode from communication unit; The described reception between the collector electrode of optocoupler (204) phototriode and the ground from communication unit is connected with resistance (207); The described transmission between the negative pole of optocoupler (203) light-emitting diode and the transmitting terminal (201) from communication unit is connected with resistance (205).
6. according to the electric current loop communicating circuit of the described photovoltaic generating system of claim 1, it is characterized in that: the described series circuit that is connected with resistance (208) and blocking diode (215) between optocoupler (203) phototriode and the common port (01) that sends from communication unit.
7. according to the electric current loop communicating circuit of the described photovoltaic generating system of claim 1, it is characterized in that: be connected with resistance (108) between collector electrode that described main communication unit transmission optocoupler (103) photosensitive three is taken over and the common port (01); Be connected with resistance (105) between the negative pole of described main communication unit transmission optocoupler (103) light-emitting diode and the transmitting terminal (101); Described main communication unit receives between optocoupler (104) phototriode emitter and the ground and is connected with resistance (107).
8. according to the electric current loop communicating circuit of the described photovoltaic generating system of claim 1, it is characterized in that: be connected with blocking diode (110) between the active end negative pole of described main communication unit common port (01) and electric current loop (02); Described main communication unit receives between optocoupler (104) light-emitting diode negative pole and the active end negative pole of electric current loop (02) and is connected with blocking diode (109).
9. according to the electric current loop communicating circuit of each described photovoltaic generating system in the claim 1 to 8, it is characterized in that: the active end of described electric current loop is an AC network.
10. according to the electric current loop communicating circuit of each described photovoltaic generating system in the claim 1 to 8, it is characterized in that: the active end of described electric current loop is a dc bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102116348A CN102281083A (en) | 2011-07-27 | 2011-07-27 | Current-loop communication circuit for photovoltaic system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102116348A CN102281083A (en) | 2011-07-27 | 2011-07-27 | Current-loop communication circuit for photovoltaic system |
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| CN102281083A true CN102281083A (en) | 2011-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011102116348A Pending CN102281083A (en) | 2011-07-27 | 2011-07-27 | Current-loop communication circuit for photovoltaic system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644670A (en) * | 2011-12-24 | 2012-08-22 | 浙江大学 | Non-contact communication device used for magnetic suspension bearing |
| CN104467007A (en) * | 2014-04-18 | 2015-03-25 | 南昌工程学院 | Control system for single phase cascading multi-level photovoltaic grid-connected inverter |
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| CN201425742Y (en) * | 2009-05-21 | 2010-03-17 | 蒋涵民 | Monocyclic two-way serial communication device based on current loop |
| CN101706144A (en) * | 2009-11-05 | 2010-05-12 | 宁波奥克斯空调有限公司 | Method for judging communication failures of indoor unit and outdoor unit of varied-frequency air conditioner |
| CN202153735U (en) * | 2011-07-27 | 2012-02-29 | 江苏浩峰汽车附件有限公司 | Current loop communication circuit for photovoltaic power generation system |
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2011
- 2011-07-27 CN CN2011102116348A patent/CN102281083A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2512163Y (en) * | 2001-11-19 | 2002-09-18 | 顺德市华傲电子有限公司 | Semi-duplex current ring communication equipment |
| CN201425742Y (en) * | 2009-05-21 | 2010-03-17 | 蒋涵民 | Monocyclic two-way serial communication device based on current loop |
| CN101706144A (en) * | 2009-11-05 | 2010-05-12 | 宁波奥克斯空调有限公司 | Method for judging communication failures of indoor unit and outdoor unit of varied-frequency air conditioner |
| CN202153735U (en) * | 2011-07-27 | 2012-02-29 | 江苏浩峰汽车附件有限公司 | Current loop communication circuit for photovoltaic power generation system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102644670A (en) * | 2011-12-24 | 2012-08-22 | 浙江大学 | Non-contact communication device used for magnetic suspension bearing |
| CN104467007A (en) * | 2014-04-18 | 2015-03-25 | 南昌工程学院 | Control system for single phase cascading multi-level photovoltaic grid-connected inverter |
| CN104467007B (en) * | 2014-04-18 | 2017-07-04 | 南昌工程学院 | Single-phase cascade multilevel photovoltaic grid-connected inverter control system |
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Application publication date: 20111214 |