CN105048787A - Fiber integrated communication method for multi-level cascading type high-voltage frequency converter - Google Patents
Fiber integrated communication method for multi-level cascading type high-voltage frequency converter Download PDFInfo
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- CN105048787A CN105048787A CN201510312519.8A CN201510312519A CN105048787A CN 105048787 A CN105048787 A CN 105048787A CN 201510312519 A CN201510312519 A CN 201510312519A CN 105048787 A CN105048787 A CN 105048787A
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Abstract
The invention relates to a fiber control and communication method for a multi-level cascading type high-voltage frequency converter. Five fibers are used in a full-bridge circuit for realizing voltage feedback, temperature feedback, fault feedback of a DC bus and transmission of PWM control signals, comprehensive, rapid and reliable data communication of a control system in the multi-level cascading type high-voltage frequency converter is realized, voltage feedback signals, temperature feedback signals and fault feedback signals of the DC bus realize integrated communication according to a certain protocol by use of one fiber, the number of consumed fibers is greatly reduced, the cost and the complexity of the multi-level cascading type high-voltage frequency converter are reduced, and high-performance transformer output control and software and hardware protection are realized. According to the invention, a master controller, while finishing calculation of the PWM signals of the inverter full-bridge circuit, receives signals transmitted by a driving controller via the fibers through ordering the voltage feedback signals, the temperature feedback signals and the fault feedback signals of the DC bus according to the certain protocol, the voltage feedback signals, the temperature feedback signals and the fault feedback signals of the DC bus are parsed in the main controller, and accordingly, proper signals are generated for the driving controller.
Description
Technical field
The present invention relates to a kind of optical fiber integrated communicaton method for multi-level concatenation frequency converter.
Background technology
Along with converter technique development, frequency converter starts to high-power high-voltage future development.In various technical scheme, multi-level concatenation high voltage converter have topology expansion simple, control the features such as easy and output waveform quality is good, become high-power high voltage frequency converter and use maximum topological structures.Along with level exports the increase of quantity, frequency converter needs more cascade module, each cascade module is made up of a full-bridge circuit, and each full-bridge electricity needs independently DC bus-bar voltage feedback, temperature feedback, fault feedback signal and pwm control signal.Because high voltage can produce larger electromagnetic interference, consider the anti-interference requirement of fail safe and Signal transmissions, DC bus-bar voltage feedback, temperature feedback, fault feedback signal and pwm control signal in general full-bridge circuit are sent to control circuit by optical fiber simultaneously.
The general principle of Optical Fiber Transmission comes " 1 " and " 0 " of express digital signal by light beam in optical fiber " bright " and " going out " two states.A full-bridge circuit comprises 2 half-bridge modules (4 IGBT compositions), therefore needs 4 optical fiber to carry out the transmission of pwm control signal altogether.If the resolution that direct voltage A/D samples is 12, then the optical fiber on 1 group of 12 tunnel is needed to carry out parallel transmission direct voltage sampled signal; In like manner, need the optical fiber on 2 group of 12 tunnel to transmit temperature signal in addition; Also need the optical fiber on 2 group of 1 tunnel to carry out transmission fault feedback signal simultaneously.Like this, in order to control a full-bridge modules, need use 42 road optical fiber altogether, this adds complexity and the cost of system undoubtedly.Just because of this, general high voltage converter can't feed back d. c. voltage signal and temperature signal, only use 4 road PWM to control and 1 line state feedback totally 5 optical fiber, but this reduces control performance and the temperature detection ability of frequency converter, be unfavorable for realizing high performance Frequency Converter Control.
Summary of the invention
The object of the invention is: a kind of optical fiber integrated communicaton method for multi-level concatenation frequency converter is provided, use the method, 5 optical fiber are used to realize the transmission of DC bus-bar voltage feedback, temperature feedback, fault feedback signal and pwm control signal to a full-bridge circuit, to realize comprehensive, quick, the reliable data communication of control system in multi-level concatenation high voltage converter.
Design of the present invention is: the transmission of PWM drive singal is consistent with traditional method, uses 4 optical fiber to carry out real-time Transmission to each full-bridge circuit.Meanwhile, 1 optical fiber is passed through according to certain agreement to DC bus-bar voltage feedback, temperature feedback and fault feedback signal, adopt the method for asynchronous serial communication to transmit.
According to foregoing invention design, technical scheme of the present invention is made up of following link:
1. master controller 1 can according to demand and the signal feedback of driving governor 2, and the pwm pulse signal sending real-time change, to driving governor 2, using optical fiber 3 as medium, to realize fast, the power model group of stabilized driving full-bridge circuit.
2. driving governor 2 receives the pwm pulse signal of autonomous controller 1, carries out Fast synchronization and error detection, and pulse signal is sent on PWM driving interface circuit 12 the most at last, to produce the suitable gate leve signal required for full-bridge circuit.
3. driving governor 2 periodically transmission frame data, are sent to master controller 1 by optical fiber 3.On serial communication protocol, frame data comprise: 3 start bits, 12 DC bus-bar voltage sampled values, 2 group of 12 megadyne temperature degree sampled value and 3 position of rests, and the logical one of some; The fault feedback signal of 1 is inserted between the juxtaposition of each sampled value, logical one.The summation of data bit is fixed, and means that asynchronous communication has and periodically can follow.Driving governor 2 can carry out according to malfunction can the quick protection of timing reset.
4. master controller 1 is according to the setting of this agreement, can parse 3 results of DC bus-bar voltage feedback, temperature feedback and fault feedback simultaneously, can carry out rapid adjustment or the error protection of PWM control strategy according to result.
The present invention compared with the prior art, has following outstanding substantive distinguishing features and advantage:
1., by the asynchronous serial communication scheme of two-forty optical fiber, single pass multiple feedback data acquisition can be realized, can increase flexibly according to communication protocol or reduce the feedback signal needing integrated transmission,
2. master control control and drived control all can carry out duplicate protection according to current failure state, enhance the reliability of system.
Accompanying drawing explanation
Fig. 1 is signal wiring schematic diagram of the present invention.
Fig. 2 is master controller 1 theory diagram of the present invention.
Fig. 3 is driving governor 2 theory diagram of the present invention.
Fig. 4 is asynchronous serial communication protocol schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
Optical fiber for multi-level concatenation frequency converter controls and an integrated communication system, for Fig. 1, comprises master controller 1 and driving governor 2, carries out asynchronous communication between the two by optical fiber 3.Consider industrial circle applied environment, serial communication data amount and pwm pulse timing requirements, wide bandwidth, low-loss communication plastic fiber (POF) can be selected, take into account softness, strong character.The speed of communication also depends on that optical fiber receiving connector 6, optical fiber send connector 7, and the maximum signal rate of general transceiver keeps consistency design, such as, can select the transceiver of 5MBd speed, maximum transmission distance 20m.
For Fig. 2, master controller 1 comprises main control processor 4, signal conditioning circuit 5, optical fiber receiving connector 6 and optical fiber and sends connector 7.Wherein, main control processor 4 is responsible for producing the pwm pulse signal of telecommunication with Dead Time, sends connector 7 electro-optic conversion, then deliver to optical fiber 3 through signal conditioning circuit 5 level conversion rear drive optical fiber; After feedback signal on optical fiber 3 is carried out opto-electronic conversion by optical fiber receiving connector 6, through signal conditioning circuit 5 level conversion, send into main control processor 4; Master controller 4 carries out synchronous by internal high frequency clock to feedback signal and resolves.
For Fig. 3, driving governor 2 comprises: drive processor 8, signal conditioning circuit 9, sensor interface circuitry 10, A/D sample circuit 11, PWM to drive interface circuit 12, optical fiber receiving connector 6 and optical fiber to send connector 7.The clock of driving governor is obtained by the clock division of master controller, thus ensure that the consistency of master controller and driving governor time.After DC bus-bar voltage, temperature and fault condition detection value enter driving governor by respective modulate circuit, master controller is sent to again according to certain communication protocol, use shielding conductor to send into modulate circuit these three weak electric signals of DC bus-bar voltage, temperature and fault condition detection value, effectively can avoid the interference that forceful electric power causes it.Specifically be implemented as follows:
Temperature sensor signal and direct voltage transducing signal are included in rear feeding signal conditioning circuit 9 and are carried out gain conditioning by sensor interface circuitry 10, carry out Quick Acquisition by A/D sample circuit 11, and the operation of A/D sample circuit 11 controls by driving processor 8; The pwm pulse signal that signal conditioning circuit 9 is also responsible for optical fiber 3 to input to optical fiber receiving connector 6 carries out level conversion, send into and drive processor 8 carry out synchronous and detect, do not allow the operating mode occurring the conducting simultaneously of the upper and lower bridge of PWM, pwm signal is sent into after signal conditioning circuit 9 is nursed one's health PWM after detection is errorless again and drive interface circuit 12; The fault-signal feeding that signal processing circuit 9 also receives the power model that PWM drives interface circuit 12 to feed back simultaneously drives processor 8 to detect, do not allow to start pwm pulse when fault-signal is enable, while detection, drive processor 8 that the A/D acquired data values of voltage, temperature and fault-signal are carried out frame combination by asynchronous serial communication protocol, with regular length, namely, after the fixed cycle sends to signal conditioning circuit 9 suitably to nurse one's health, sent after connector 7 carries out electro-optic conversion by optical fiber and be sent on optical fiber 3.
Fig. 4 is asynchronous serial communication protocol schematic diagram of the present invention, and serial asynchronous communication requires that high frequency clock has carried out coding and synchronous, can select at a high speed, highdensity FPGA(field programmable gate array) etc. programming device realize.
With 400 μ s asynchronous communications periods for fixing frame length, 2 μ s were 1 bit stealing cycle is example, drive processor 8 internal logic will combine start bit (totally 3 by cycle request, be fixed as " 000 ", time is 6 μ s), 2 tunnel 12 megadyne temperature degree and 12,1 tunnel direct voltage image data, 1 fault interpolation (E) (totally 72 is set between each position, 36 bit data, 36 fault difference positions, time is 144 μ s), position of rest (totally 3, be fixed as " 010 ", time is 6 μ s), the mode that remaining time adopts fixing high level and 1 fault interpolation (E) to mix is until new start bit occurs.After system electrification first 5 seconds, can set fault interpolation (E) was logical one, discharges afterwards.So, main control processor 4 is after Asynchronous Reception, and the logical one that can continue in data-driven frame and start bit (000) have carried out periodic synchronous fast, synchronously receives as used 50MHz clock; Once synchronously complete; main control processor 4 can feed back DC bus-bar voltage, temperature feedback and fault feedback signal are resolved; comparatively speaking; the dynamic change of DC bus-bar voltage feedback, temperature feedback is high not as fault feedback signal; the amount of information of the fault feedback signal thus obtained in frame data is objective, can meet the requirement of the real-time guard of system.When fault interpolation (E) is enable, master control control and drived control all can respond and complete PWM timely and block or other protection act, wherein drive processor 8 can block pwm pulse, misdirection according to fault timing, until recover pulse after trouble shooting, instruction is normal; The state of main control processor 4 also identifiable design asynchronous serial communication interruption or mistake, carries out error protection and mistake display in time, and after waiting for fault recovery, recovers communication and instruction is normal.
Claims (5)
1. the optical fiber integrated communicaton method for multi-level concatenation high voltage converter, it is characterized in that: provide a kind of optical fiber for multi-level concatenation frequency converter to control and communication means, use the inventive method, 5 optical fiber are used to realize the transmission of DC bus-bar voltage feedback, temperature feedback, fault feedback signal and pwm control signal to a full-bridge circuit, to realize comprehensive, quick, the reliable data communication of control system in multi-level concatenation high voltage converter.
2. the optical fiber integrated communicaton method for multi-level concatenation high voltage converter, it is characterized in that: DC bus-bar voltage feedback signal is obtained by voltage sensor senses, temperature feedback signal is detected by temperature sensor and obtains, and the fault feedback signal that fault feedback signal is driven by IGBT obtains by detecting the voltage and current signal of igbt.
3., for an optical fiber integrated communicaton method for multi-level concatenation high voltage converter, it is characterized in that: the clock of driving governor is obtained by the clock division of master controller, thus ensure that the consistency of master controller and driving governor time.
4. the optical fiber integrated communicaton method for multi-level concatenation high voltage converter, it is characterized in that: after DC bus-bar voltage, temperature and fault condition detection value enter driving governor by respective modulate circuit, master controller is sent to again according to certain communication protocol, use shielding conductor to send into modulate circuit these three weak electric signals of DC bus-bar voltage, temperature and fault condition detection value, effectively can avoid the interference that forceful electric power causes it.
5. the optical fiber integrated communicaton method for multi-level concatenation high voltage converter according to claim 1, comprises the following steps:
(1) work of master controller mainly completes the calculating of the pwm signal of all full-bridge circuits, receive simultaneously by driving governor through Optical Fiber Transmission to signal; In the host controller, utilize internal clock signal in master controller complete the synchronous of igbt fault-signal in temperature signal to the igbt in full bridge unit, full bridge unit in DC bus-bar voltage signal and full bridge unit and resolve, judge whether system occurs that the temperature of the igbt in full bridge unit is too high, igbt in full bridge unit in DC bus-bar voltage overvoltage and full bridge unit breaks down.Too high according to occurrence temperature, DC bus-bar voltage is too high and the concrete condition of igbt fault, master controller carries out rapid adjustment or the fault protection of PWM control strategy.
(2) work of driving governor is detect pwm pulse whether the pipe conducting simultaneously up and down of half brachium pontis occurs on the one hand, if pipe conducting simultaneously up and down, then produce fault-signal, blockade driving governor exports to the pwm signal of full-bridge circuit, if manage not conducting simultaneously up and down, then driving governor is to full-bridge circuit output pwm signal; It is on the other hand the igbt fault-signal in the temperature signal to the igbt in the full bridge unit collected, full bridge unit in DC bus-bar voltage signal and full bridge unit; according to cycle regular hour; each road signal is sorted; simultaneously can carry out according to malfunction can the quick protection of timing reset for driving governor, ensure that system safety stable operation.On serial communication protocol, frame data comprise: 3 start bits, 12 DC bus-bar voltage sampled values, 2 group of 12 megadyne temperature degree sampled value and 3 position of rests, and the logical one of some; The fault feedback signal of 1 is inserted between the juxtaposition of each sampled value, logical one.The summation of data bit is fixed, and achieves the periodicity of asynchronous communication, is convenient to main controller and resolves the frame data that driving governor sends.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107528456A (en) * | 2017-10-19 | 2017-12-29 | 合肥联信电源有限公司 | A kind of high power module optical fiber drive signal change-over panel |
| US11646668B2 (en) | 2020-10-27 | 2023-05-09 | Delta Electronics, Inc. | Power converter |
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Application publication date: 20151111 |