CN102355303B - Optical fibre communication method for transmission of inverter pulse width modulation signals - Google Patents
Optical fibre communication method for transmission of inverter pulse width modulation signals Download PDFInfo
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- CN102355303B CN102355303B CN201110287501.9A CN201110287501A CN102355303B CN 102355303 B CN102355303 B CN 102355303B CN 201110287501 A CN201110287501 A CN 201110287501A CN 102355303 B CN102355303 B CN 102355303B
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Abstract
The invention discloses an optical fibre communication method for transmission of inverter pulse width modulation signals. The method comprises the following steps that: in a driving instruction downlink transmission process, the driving instructions of 6 IGBTs (Insulated Gate Bipolar Translators) are coded into level signals with different frequencies, and an optical fibre is used for communication after the level signals are converted into optical signals; an optical fibre receiver converts the optical signals into the level signals with different frequencies, and a decoder converts the level signals into driving signals corresponding to the 6 IGBTs; and in a state instruction uplink transmission process, state information of the 6 IGBTs is coded into the level signals with different frequencies, and one optical fibre is used for communication after the level signals are converted into the optical signals, the optical fibre receiver converts the optical signals into the level signals with different frequencies, and the decoder converts the level signals into state signals corresponding to the 6 IGBTs. The method provided by the invention can execute two-way transmission of 6 paths of IGBT driving and state returning signals through two optical fibres and corresponding coding and decoding devices.
Description
Technical field
The present invention relates to two level converter Driving technique, especially relate to a kind of by Optical Fiber Transmission driving signal and the method for returning to IGBT state information.
Background technology
Two-level inversion device is three phase full bridge inverter circuit, adopts 6 IGBT as main switching device.In high-power inverter for anti-stop signal disturbs, require control circuit and main inversion electric circuit reliably to isolate, therefore general frequency conversion mostly adopts 6 road optical fiber to transmit 6 road IGBT and drives signals, returns to 6 IGBT status signals, shared 12 road optical fiber with 6 road optical fiber.So fiber optic receiver and fiber optic transmitter all must be each with 12 pairs, add 12 road optical fiber, not only increase device cost, and increased human cost, the while is due to the increase of device and the increase of manpower, can cause fault point to be increased and the increasing of setup error.
Summary of the invention
The object of the invention is to adopt two optical fiber communications, drive 6 road IGBT and return to 6 road IGBT state informations.
For realizing object of the present invention, a kind of optical fibre communication method for transmission of inverter pulse width modulation signals is proposed.The method is in driving instruction downlink transmission process, the level signal that is different frequency by the driving instruction encoding of 6 IGBT, after being converted into light signal with optical fiber generator, adopt an optical fiber communication, fiber optic receiver is converted into described light signal the level signal of different frequency, and decoder is converted into level signal the driving signal of 6 corresponding IGBT; In status command uplink process, the state information of 6 IGBT is encoded to the level signal of different frequency, after being converted into light signal with optical fiber generator, adopt an optical fiber communication, fiber optic receiver is converted into light signal the level signal of different frequency, decoder is converted into level signal the status signal of 6 corresponding IGBT, and realization is carried out 6 road IGBT drivings with two optical fiber and coding and decoding device and returned to the transmitted in both directions of 6 road IGBT status signals.
The concrete steps of the method comprise:
1) in downlink optical fiber communication process, obtain system command, and order is encoded, and be converted into corresponding level signal
2) with optical fiber generator, described level signal is converted into light signal;
3) accept described light signal with fiber optic receiver, and be converted into level signal;
4) by described level signal decoding, and send corresponding IGBT driving signal;
5) in uplink optical fibers communication process, the state of each IGBT is analyzed to judgement, whether there is fault, fault message is encoded, be converted into corresponding level signal;
6) with optical fiber generator, described level signal is converted into light signal;
7) accept described light signal with fiber optic receiver, and be converted into level signal;
8) described level signal is decoded, draw corresponding IGBT state information
The present invention is exactly by utilizing different frequency to represent different driving signals and switch fault signal, has realized the communication means of 12 optical fiber of two optical fiber replacements.
Brief description of the drawings
Fig. 1 is inversion main loop circuit figure;
Fig. 2 is communication code decoding schematic diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, the present invention is described in more detail.
Fig. 1 is inversion main loop circuit figure; In figure ,+Udc and-Udc represents respectively positive and negative busbar magnitude of voltage.Two-level inversion device major loop has following on off state:
On off state S
i=1 or 0 (i=1,2 ... ..6), 1 represent open-minded, 0 representative turn-off, have so 2
3=8 kinds of on off states.Wherein, run mode S1 and S4 complementation, S2 and S5 complementation, S3 and S6 complementation; Complementation is: the situation of conducting simultaneously can not appear in the upper and lower bridge arm of same bridge, i.e. S1 and S4 conducting simultaneously, S2 and S5 conducting simultaneously, S3 and S6 conducting simultaneously.Stopping state S1, S2 ...., S6 complete shut-down is disconnected.
Fig. 2 is communication code decoding schematic diagram.As shown in the figure, up, in downlink optical fiber, transmit respectively different frequency, the square-wave signal that pulsewidth is 50%, utilizes different frequency to represent different driving signals and switch fault signal, has realized the communication means of 12 optical fiber of two optical fiber replacements.Encoding and decoding postpone maximum time during by minimum communication frequency 2 times of correspondence cycle, be Tdmax=1/2.4m2 < 1us, and high-power inverter switching frequency is not generally higher than 2K, be carrier cycle Tc >=500us, the encoding and decoding time of 1us is far smaller than switch periods, can not affect the response of pwm signal.
Tabulate and utilize different frequency to represent different driving signals and the specific embodiment of switch fault signal with two below.
Table 1 has mainly illustrated that eight kinds drive corresponding eight kinds of on off states under signals, the value of its carrier frequency, and the value of corresponding carrier frequency under stop signal state.
The descending IGBT of table 1 drives the corresponding carrier frequency table of signal
| Drive signal | A | B | C | FC(MHz) |
| V 1 | 0 | 0 | 0 | 3.8 |
| V 2 | 0 | 0 | 1 | 3.6 |
| V 3 | 0 | 1 | 0 | 3.4 |
| V 4 | 0 | 1 | 1 | 3.2 |
| V 5 | 1 | 0 | 0 | 3.0 |
| V 6 | 1 | 0 | 1 | 2.8 |
| V 7 | 1 | 1 | 0 | 2.6 |
| V 8 | 1 | 1 | 1 | 2.4 |
| V 9 | OFF | OFF | OFF | 4 |
In table: V
i(i=1,2 ..., 9) and represent various driving signals.A, B, the value of C represents opening of three bridge upper and lower bridge arms or shutoff situation: the lower brachium pontis of 0 representative is open-minded, and upper brachium pontis turn-offs; The lower brachium pontis of 1 representative turn-offs, and upper brachium pontis is open-minded; OFF represents that upper and lower bridge arm complete shut-down is disconnected.FC is carrier frequency, and unit is MHz.Every kind drives signal to distinguish by different carrier frequencies.
Table 2 mainly illustrated the corresponding concrete abort situation of each fault-signal with and the value of carrier frequency.In table: Ei (i=1,2 ..., 7) and 7 kinds of different faults signals of expression.
The corresponding carrier frequency table of the up IGBT state of table 2
| Fault-signal | A | B | C | FC(MHz) |
| E0 | 0 | 0 | 0 | 2.6 |
| E1 | 0 | 0 | 1 | 2.8 |
| E2 | 0 | 1 | 0 | 3.0 |
| E3 | 0 | 1 | 1 | 3.2 |
| E4 | 1 | 0 | 0 | 3.4 |
| E5 | 1 | 0 | 1 | 3.6 |
| E6 | 1 | 1 | 0 | 3.8 |
| E7 | 1 | 1 | 1 | 4(M) |
A, B, whether the value representation brachium pontis of C breaks down: 0 is brachium pontis fault-free, and 1 is bridgc arm short fault.FC is carrier frequency, and unit is MHz.Every kind of fault-signal can be distinguished by different carrier frequencies.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect have been carried out to further detailed description; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. for an optical fibre communication method for transmission of inverter pulse width modulation signals, it is characterized in that:
In driving instruction downlink transmission process, the level signal that is different frequency by the driving instruction encoding of 6 IGBT, and adopt an optical fiber communication after being converted into light signal, fiber optic receiver is converted into described light signal the level signal of different frequency, and decoder is converted into level signal the driving signal of 6 corresponding IGBT; In status command uplink process, the state information of 6 IGBT is encoded to the level signal of different frequency, and adopt an optical fiber communication after being converted into light signal, fiber optic receiver is converted into light signal the level signal of different frequency, decoder is converted into level signal the status signal of 6 corresponding IGBT, realizes the transmitted in both directions of carrying out 6 road IGBT drivings and return state signal with two optical fiber and coding and decoding device;
Described driving instruction downlink transmission process and status command uplink process comprise concrete steps:
1) in downlink optical fiber communication process, obtain system command, and order is encoded, and be converted into corresponding level signal;
2) with optical fiber generator, described level signal is converted into light signal;
3) receive described light signal with fiber optic receiver, and be converted into level signal;
4) by described level signal decoding, and send corresponding IGBT driving signal;
5) in uplink optical fibers communication process, the state of each IGBT is analyzed to judgement, whether there is fault, fault message is encoded, be converted into corresponding level signal;
6) with optical fiber generator, described level signal is converted into light signal;
7) receive described light signal with fiber optic receiver, and be converted into level signal;
8) described level signal is decoded, draw corresponding IGBT state information;
In described downlink optical fiber communication process, the carrier frequency of light signal and descending IGBT drive signal corresponding relation according to following table:
In table: V
i(i=1,2 ..., 9) and represent that 9 kinds drive signal, A, B, the value of C represents opening of three bridge upper and lower bridge arms or shutoff situation: the lower brachium pontis of 0 representative is open-minded, and upper brachium pontis turn-offs; The lower brachium pontis of 1 representative turn-offs, and upper brachium pontis is open-minded; OFF represents that upper and lower bridge arm complete shut-down is disconnected; FC is carrier frequency;
In uplink optical fibers communication process, the carrier frequency corresponding relation of up IGBT state and light signal is as following table:
In table: Ei(i=1,2 ..., 7) and represent 7 kinds of different faults signals, A, B, whether the value representation brachium pontis of C breaks down: 0 is brachium pontis fault-free, and 1 is bridgc arm short fault; FC is carrier frequency.
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| CN201110287501.9A CN102355303B (en) | 2011-09-26 | 2011-09-26 | Optical fibre communication method for transmission of inverter pulse width modulation signals |
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| CN201110287501.9A CN102355303B (en) | 2011-09-26 | 2011-09-26 | Optical fibre communication method for transmission of inverter pulse width modulation signals |
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| CN103338074B (en) * | 2013-06-13 | 2016-04-20 | 国家电网公司 | A kind of optical-fibre communications coding/decoding system of controllable high-voltage shunt reactor and method thereof |
| CN104167906A (en) * | 2014-08-12 | 2014-11-26 | 天津瑞能电气有限公司 | Method for transmitting half-bridge IGBT module driving signals through optical fibers |
| CN105429442B (en) * | 2015-12-19 | 2018-01-30 | 四川中大华瑞能源技术有限公司 | The optical fibre communication method and system of high-power current converting device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2678242Y (en) * | 2003-06-01 | 2005-02-09 | 王连富 | Large power frequency conversion inverter |
| CN101303796A (en) * | 2008-06-26 | 2008-11-12 | 镇江华东电力设备制造厂 | System for transmitting control signal of high voltage frequency converter power unit |
| CN101783592A (en) * | 2010-01-08 | 2010-07-21 | 中电电气集团有限公司 | Modulation-demodulation method of high-voltage frequency converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2678242Y (en) * | 2003-06-01 | 2005-02-09 | 王连富 | Large power frequency conversion inverter |
| CN101303796A (en) * | 2008-06-26 | 2008-11-12 | 镇江华东电力设备制造厂 | System for transmitting control signal of high voltage frequency converter power unit |
| CN101783592A (en) * | 2010-01-08 | 2010-07-21 | 中电电气集团有限公司 | Modulation-demodulation method of high-voltage frequency converter |
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