CN110971557B - Carrier synchronization method and system for parallel operation of multiple converters - Google Patents
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Abstract
The invention provides a carrier synchronization method and a carrier synchronization system when a plurality of converters work in parallel. The frequency of the modulated wave signal is lower than that of the original synchronous signal, and the frequency of the modulated wave signal is consistent with that of the carrier synchronous clock signal obtained by modulation, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission; compared with the scheme of carrying out carrier synchronization by utilizing the communication conversion module, the invention does not need to transmit the synchronous signal while transmitting the conventional signal, thereby reducing the influence on the software architecture and the communication pressure.
Description
Technical Field
The invention relates to the technical field of converters, in particular to a carrier synchronization method and a carrier synchronization system for parallel operation of a plurality of converters.
Background
When a plurality of converters are operated in parallel, because the carrier frequencies of the different converters are determined by their respective controllers, and the carrier frequency is generated by a series of conversions of oscillating circuits such as crystal oscillators, the carrier frequency of each controller is deviated due to the dispersion of the oscillating circuits, and the carrier frequency deviation causes a series of problems in the system. In inverter applications, there are two main effects: the first is the subharmonic oscillation problem, and the second is the common mode current circulation problem in a non-isolated system.
In order to solve the problem that carrier frequencies are inconsistent when a plurality of converters are in parallel connection, two methods exist at present. Firstly, for the situation that the positions of different controllers are relatively close, the controllers of all the converters are directly connected by using the synchronous pins of the controllers so as to achieve the purpose of carrier synchronization, as shown IN fig. 1, SYN_IN represents the synchronous input pin of the controller, and SYN_OUT represents the synchronous output pin of the controller; however, the strength of the synchronization signal transmitted between the controllers is weak and the frequency is high, limiting its long-range transmission.
Secondly, for the situation that the positions of different controllers are far, a communication conversion module is utilized to transmit a synchronous signal while transmitting a conventional signal, and software is utilized to identify the synchronous signal so as to realize synchronization, as shown in fig. 2, TX represents a transmitting end of the controller, and RX represents a receiving end of the controller; however, because the precision requirement of carrier synchronization is higher, for example, under the carrier frequency of several KHz, the precision of carrier synchronization is generally in us or even ns level, so that the carrier synchronization is realized by adopting a communication method, the communication interrupt priority is raised to the highest in software, so that the influence on the realization of the carrier same-wave function due to the interruption of communication tasks by other tasks is avoided; meanwhile, the scheme of loading the communication information on the carrier synchronization information at the transmitting end is specially designed to ensure that the synchronization information acquired by the receiving end is consistent with the transmitting end as much as possible. These means that the software architecture needs to be adjusted to adapt to the requirement of carrier synchronization, increasing the complexity of the software architecture and increasing the communication pressure.
Disclosure of Invention
In view of this, the present invention provides a carrier synchronization method and system for parallel operation of multiple converters, which is intended to achieve carrier synchronization for parallel operation of multiple converters on the basis of reducing the influence on the software architecture and communication pressure.
In order to achieve the above object, the following solutions have been proposed:
in a first aspect, the present invention provides a carrier synchronization method when a plurality of converters work in parallel, including:
modulating an original synchronous signal sent by a main controller in the plurality of converters by using a modulated wave signal to obtain a carrier synchronous clock signal, wherein the frequency of the modulated wave signal is lower than that of the original synchronous signal;
and transmitting the carrier synchronization clock signal to each slave controller in the plurality of converters, so that each slave controller performs carrier synchronization at least once in each period of the carrier synchronization clock signal.
Optionally, the carrier synchronous clock signal is transmitted to each slave controller in the plurality of converters, specifically:
the carrier synchronous clock signal is transmitted to each slave controller of the plurality of converters by utilizing a differential transmission technology.
Optionally, the hardware of the master controller is the same as that of each of the slave controllers, and the master controller is a controller automatically selected according to a preset contention mechanism.
Optionally, the modulated wave signal is generated by the master controller.
In a second aspect, the present invention provides a carrier synchronization system when a plurality of converters are operated in parallel, including:
the digital circuit module is used for modulating an original synchronous signal sent by a main controller in the plurality of converters by using a modulated wave signal to obtain a carrier synchronous clock signal, and the frequency of the modulated wave signal is lower than that of the original synchronous signal;
and the signal transmission module is used for sending the carrier synchronization clock signal to each slave controller in the plurality of converters so that each slave controller performs carrier synchronization at least once in each period of the carrier synchronization clock signal.
Optionally, the signal transmission module is specifically configured to:
the carrier synchronous clock signal is transmitted to each slave controller of the plurality of converters by utilizing a differential transmission technology.
Optionally, the signal transmission module includes: the single-ended and differential conversion circuit is arranged in each converter in the plurality of converters;
the single-ended and differential conversion circuit is positioned in the same converter with the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a single-ended signal into the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a differential signal;
the unidirectional transmission bus is used for transmitting the carrier synchronous clock signal in the form of a differential signal to a single-ended and differential conversion circuit which is respectively positioned in the same converter with each slave controller; the method comprises the steps of,
and the single-end and differential conversion circuits are respectively positioned in the same converter with the slave controllers and are used for converting the carrier synchronous clock signals in the form of differential signals into carrier synchronous signals in the form of single-end signals and transmitting the carrier synchronous signals to the slave controllers.
Optionally, the hardware of the master controller is the same as that of each slave controller, and the master controller is a controller automatically selected according to a preset competition mechanism;
each converter in the plurality of converters comprises a digital circuit module;
the digital circuit module is positioned in the same converter with the main controller and is used for modulating an original synchronous signal sent by the main controller by using a modulating wave signal to obtain a carrier synchronous clock signal;
the signal transmission module is specifically configured to send the carrier synchronization clock signal to each slave controller through a digital circuit module respectively located in the same converter with each slave controller.
Optionally, the signal transmission module includes: the bidirectional transmission bus and the single-ended and differential conversion circuit are arranged in each converter in the plurality of converters;
the single-ended and differential conversion circuit is positioned in the same converter with the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a single-ended signal into the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a differential signal;
the dual-phase transmission bus is used for transmitting the carrier synchronous clock signal in the form of a differential signal to each single-ended and differential conversion circuit which is positioned in the same converter with the slave controller; the method comprises the steps of,
and each single-end and differential conversion circuit which is positioned in the same converter with the slave controller is used for converting the carrier synchronous clock signal in the form of differential signals into the carrier synchronous signal in the form of single-end signals and transmitting the carrier synchronous signal to the slave controller.
Optionally, the modulated wave signal is generated by the master controller, a timer of the digital circuit module, or an external clock circuit.
Optionally, the digital circuit module specifically includes: a circuit built by a basic logic circuit, an FPGA (Field Programmable Gate Array ) or a CPLD (Complex Programmable Logic Device, complex programmable logic device).
Compared with the prior art, the technical scheme of the invention has the following advantages:
the method comprises the steps of modulating an original synchronous signal sent by a main controller in a plurality of converters by using a modulating wave signal to obtain a carrier synchronous clock signal, and transmitting the carrier synchronous clock signal to each slave controller in the plurality of converters to perform carrier synchronization. The frequency of the modulated wave signal is lower than that of the original synchronous signal, and the frequency of the modulated wave signal is consistent with that of the carrier synchronous clock signal obtained by modulation, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission; compared with the scheme of carrying out carrier synchronization by utilizing the communication conversion module, the invention does not need to transmit the synchronous signal while transmitting the conventional signal, thereby reducing the influence on the software architecture and the communication pressure.
Furthermore, when the carrier synchronous clock signal is transmitted between the master controller and the slave controller, the differential transmission technology is utilized for transmission, so that the anti-interference capability of the signal is improved. And automatically selecting the main controller through a competition mechanism, so that the hardware settings of the controllers are the same.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of carrier synchronization using a synchronization pin of a controller when a plurality of converters are operated in parallel;
FIG. 2 is a schematic diagram of carrier synchronization by transmitting a synchronization signal by a communication conversion module when a plurality of converters are operated in parallel;
fig. 3 is a flowchart of a carrier synchronization method when a plurality of converters are operated in parallel according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of signal modulation according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a carrier synchronization system when a plurality of converters are operated in parallel according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a master controller generating a modulated wave signal according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a digital circuit module according to an embodiment of the present invention;
fig. 8 is a schematic diagram of another carrier synchronization system when a plurality of converters are operated in parallel according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a carrier synchronization system when a plurality of converters are operated in parallel according to another embodiment of the present invention;
fig. 10 is a schematic diagram of a carrier synchronization system when a plurality of converters are operated in parallel according to another embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a carrier synchronization method when a plurality of converters work in parallel, referring to fig. 3, the carrier synchronization method includes the steps of:
s31: and modulating the original synchronous signals sent by the main controller in the plurality of converters by using the modulated wave signals to obtain carrier synchronous clock signals.
The current transformer comprises a controller, wherein the controller of one current transformer in a plurality of current transformers working in parallel can be selected as a master controller, and the controllers of other current transformers can be selected as slave controllers. The master controller transmits a carrier synchronization clock signal to the slave controller.
In the present invention, the original synchronization signal refers to a synchronization signal transmitted when carrier synchronization is performed by the method shown in fig. 1, and the frequency of the synchronization signal is high, which is not suitable for long-distance transmission. The frequency of the modulated wave signal is lower than that of the original synchronous signal, the original synchronous signal is modulated by the modulated wave signal, and the frequency of the obtained modulated signal (namely the carrier synchronous clock signal) is consistent with that of the modulated wave signal, so that the device is suitable for long-distance transmission.
In one or more embodiments, the synchronization signal is passed when the modulated wave signal is low. Specifically, the positive pulse width of the modulated wave signal is set to be larger than the negative pulse width, when the modulated wave signal is at a low level, the carrier synchronization Clock signal is identical to the original synchronization signal, and when the modulated wave signal is at a high level, the carrier synchronization Clock signal is at a high level, as shown in fig. 4, syn_out represents the original pulse signal, syn_clock represents the modulated wave signal, and SYN represents the carrier synchronization Clock signal.
In one or more embodiments, the synchronization signal is passed when the modulated wave signal is high. Specifically, the negative pulse width of the modulated wave signal is set to be larger than the positive pulse width, when the modulated wave signal is at a high level, the carrier synchronous clock signal is consistent with the original synchronous signal, when the modulated wave signal is at a low level, the carrier synchronous clock signal is at a low level,
s32: the carrier synchronization clock signal is transmitted to each slave controller in the plurality of converters such that each slave controller performs carrier synchronization at least once in each period of the carrier synchronization clock signal.
Specifically, the slave controller may perform carrier synchronization on a rising edge of the carrier synchronization clock signal or perform carrier synchronization on a falling edge of the carrier synchronization clock signal.
According to the carrier synchronization method for the parallel operation of the plurality of converters, the original synchronization signals sent by the master controllers in the plurality of converters are modulated by using the modulation wave signals to obtain carrier synchronization clock signals, and the carrier synchronization clock signals are transmitted to each slave controller in the plurality of converters to perform carrier synchronization. The frequency of the modulated wave signal is lower than that of the original synchronous signal, and the frequency of the modulated wave signal is consistent with that of the carrier synchronous clock signal obtained by modulation, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission; compared with the scheme of carrying out carrier synchronization by utilizing the communication conversion module, the invention does not need to transmit the synchronous signal while transmitting the conventional signal, thereby reducing the influence on the software architecture and the communication pressure.
In one or more embodiments, a differential transmission technique is utilized to transfer carrier synchronized clock signals between a master controller and a slave controller to improve the immunity of the signals to interference. Specifically, the single-ended signal is converted into a differential signal at the master controller end and then transmitted to the slave controller, and the transmitted differential signal is converted into the single-ended signal at the slave controller end and then is subjected to subsequent carrier synchronization processing.
In one or more embodiments, the hardware of the master controller and the slave controller are the same, and the master controller is automatically selected through a contention mechanism. The modulated wave signal is generated by a master controller.
The following are system embodiments of the present invention that may be used to perform method embodiments of the present invention. For details not disclosed in the system embodiments of the present invention, please refer to the method embodiments of the present invention.
Referring to fig. 5, a carrier synchronization system for parallel operation of multiple converters is provided in this embodiment, including: a digital circuit module and a signal transmission module.
The digital circuit module is used for modulating the original synchronous signals sent by the main controllers in the plurality of converters by using the modulated wave signals to obtain carrier synchronous clock signals, and the frequency of the modulated wave signals is lower than that of the original synchronous signals.
And the signal transmission module is used for sending a carrier synchronization clock signal to each slave controller in the plurality of converters so that each slave controller performs carrier synchronization at least once in each period of the carrier synchronization clock signal. The signal transmission module may be a unidirectional transmission bus, and transmits the carrier synchronous clock signal to each slave controller.
The carrier synchronization system provided by the embodiment comprises a digital circuit module and a signal transmission module, wherein the digital circuit module is arranged at the main controller end of the plurality of converters and is modulated by an original synchronization signal sent by a modulated wave signal main controller to obtain a carrier synchronization clock signal; the signal transmission module transmits a carrier synchronization clock signal to each slave controller in the plurality of converters for carrier synchronization. The frequency of the modulated wave signal is lower than that of the original synchronous signal, and the frequency of the modulated wave signal is consistent with that of the carrier synchronous clock signal obtained by modulation, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission; compared with the scheme of carrying out carrier synchronization by utilizing the communication conversion module, the invention does not need to transmit the synchronous signal while transmitting the conventional signal, thereby reducing the influence on the software architecture and the communication pressure.
The modulated wave signal may be implemented in various ways, such as by a master controller, a timer of a digital circuit module, or by generation of an external clock circuit. Fig. 6 shows a schematic diagram of the generation of a modulated wave signal by a master controller. The digital circuit module may be a circuit built by a basic logic circuit, for example, an or gate may be used to implement a modulation function, as shown in fig. 7, and a latch and/or a digital switch may be used to implement a modulation function; the digital circuit module can also be a complex integrated logic circuit such as an FPGA or a CPLD.
In one or more specific embodiments, the signal transmission module is configured to transmit the carrier synchronized clock signal to each slave controller in the plurality of converters using a differential transmission technique. The specific signal transmission module includes a unidirectional transmission bus and a single-ended to differential conversion circuit disposed in each of a plurality of converters operating in parallel, as shown in fig. 8. The single-ended and differential conversion circuit is positioned in the same converter with the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a single-ended signal into the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a differential signal; the unidirectional transmission bus is used for transmitting carrier synchronous clock signals in the form of differential signals to single-ended and differential conversion circuits which are respectively positioned in the same converter with each slave controller; and the single-end and differential conversion circuits are respectively positioned in the same converter with the slave controllers and are used for converting the carrier synchronous clock signals in the form of differential signals into carrier synchronous signals in the form of single-end signals, transmitting the carrier synchronous signals to the slave controllers, and then carrying out carrier synchronous processing by the slave controllers.
In one or more embodiments, a certain controller is not designated as a master controller, and the hardware settings of the controllers of the converters are the same, and the master controller automatically selects according to a preset competition mechanism. A carrier synchronization clock signal may be transmitted to each slave controller in the plurality of converters using a differential transmission technique; specifically, referring to fig. 9, a digital circuit module is disposed in each of a plurality of converters that operate in parallel; the signal transmission module comprises a differential bus and a single-ended and differential conversion circuit arranged in each converter of the plurality of converters which are in joint operation. The transmitting function of the single-ended and differential conversion circuit in each converter is closed by default; and after receiving the transmission enabling signal sent by the main controller, the single-ended and differential conversion circuit which is positioned in the same converter with the main controller sends a carrier synchronous clock signal to the differential bus. The receiving function of each single-ended and differential conversion circuit is opened by default; and after the single-ended and differential conversion circuit which is positioned in the same converter with the slave controller receives the carrier synchronous clock signal in the differential bus, the carrier synchronous clock signal is sent to the slave controller. The differential bus in this embodiment is a bidirectional transmission bus. It should be noted that fig. 9 is only an exemplary illustration, and the transmission enable signal may also be transmitted to the single-ended and differential conversion circuit located in the same converter as the main controller by other means.
The carrier synchronous clock signal in the form of a single-ended signal can also be directly transmitted to each slave controller in the plurality of converters; specifically, referring to fig. 10, a digital circuit module is disposed in each of a plurality of converters operating in parallel. The sending function of the digital circuit module in each converter is closed by default; and after the digital circuit module which is positioned in the same converter with the main controller receives the transmission enabling signal sent by the main controller, a carrier synchronous clock signal is sent to the bidirectional transmission bus. The receiving function of each digital circuit module is opened by default; and after the digital circuit module which is positioned in the same converter with the slave controller receives the carrier synchronous clock signal in the bidirectional transmission bus, the carrier synchronous clock signal is sent to the slave controller.
For system embodiments, reference is made to the description of method embodiments for the relevant points, since they essentially correspond to the method embodiments. The system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, all embodiments are mainly described and are different from other embodiments, and the same similar parts between the embodiments are mutually referred to.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A carrier synchronization method when a plurality of converters are operated in parallel, comprising:
modulating an original synchronous signal sent by a main controller in the plurality of converters by using a modulated wave signal to obtain a carrier synchronous clock signal, wherein the frequency of the modulated wave signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is consistent with that of the modulated wave signal, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission;
and transmitting the carrier synchronization clock signal to each slave controller in the plurality of converters, so that each slave controller performs carrier synchronization at least once in each period of the carrier synchronization clock signal.
2. The carrier synchronization method when a plurality of converters are operated in parallel according to claim 1, wherein the carrier synchronization clock signal is transmitted to each slave controller of the plurality of converters, specifically:
the carrier synchronous clock signal is transmitted to each slave controller of the plurality of converters by utilizing a differential transmission technology.
3. The carrier synchronization method for parallel operation of a plurality of converters according to claim 1, wherein the master controller and each of the slave controllers have the same hardware, and the master controller is a controller automatically selected according to a preset contention mechanism.
4. The carrier synchronization method when a plurality of converters are operated in parallel according to claim 1, wherein the modulated wave signal is generated by the main controller.
5. A carrier synchronization system when a plurality of converters are operated in parallel, comprising:
the digital circuit module is used for modulating an original synchronous signal sent by a main controller in the plurality of converters by using a modulated wave signal to obtain a carrier synchronous clock signal, the frequency of the modulated wave signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is consistent with that of the modulated wave signal, so that the frequency of the carrier synchronous clock signal is lower than that of the original synchronous signal, and the carrier synchronous clock signal is suitable for long-distance transmission;
and the signal transmission module is used for sending the carrier synchronization clock signal to each slave controller in the plurality of converters so that each slave controller performs carrier synchronization at least once in each period of the carrier synchronization clock signal.
6. The carrier synchronization system when a plurality of converters are operated in parallel according to claim 5, wherein the signal transmission module is specifically configured to:
the carrier synchronous clock signal is transmitted to each slave controller of the plurality of converters by utilizing a differential transmission technology.
7. The carrier synchronization system when a plurality of converters are operated in parallel according to claim 6, wherein the signal transmission module comprises:
the single-ended and differential conversion circuit is arranged in each converter in the plurality of converters;
the single-ended and differential conversion circuit is positioned in the same converter with the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a single-ended signal into the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a differential signal;
the unidirectional transmission bus is used for transmitting the carrier synchronous clock signal in the form of a differential signal to a single-ended and differential conversion circuit which is respectively positioned in the same converter with each slave controller; the method comprises the steps of,
and the single-end and differential conversion circuits are respectively positioned in the same converter with the slave controllers and are used for converting the carrier synchronous clock signals in the form of differential signals into carrier synchronous signals in the form of single-end signals and transmitting the carrier synchronous signals to the slave controllers.
8. The carrier synchronization system when a plurality of converters are operated in parallel according to claim 5, wherein the master controller and each of the slave controllers have the same hardware, and the master controller is a controller automatically selected according to a preset contention mechanism;
each converter in the plurality of converters comprises a digital circuit module;
the digital circuit module is positioned in the same converter with the main controller and is used for modulating an original synchronous signal sent by the main controller by using a modulating wave signal to obtain a carrier synchronous clock signal;
the signal transmission module is specifically configured to send the carrier synchronization clock signal to each slave controller through a digital circuit module respectively located in the same converter with each slave controller.
9. The carrier synchronization system when a plurality of converters are operated in parallel according to claim 8, wherein the signal transmission module is specifically configured to:
the carrier synchronous clock signal is transmitted to each slave controller of the plurality of converters by utilizing a differential transmission technology.
10. The carrier synchronization system when a plurality of converters are operated in parallel according to claim 9, wherein the signal transmission module comprises:
the bidirectional transmission bus and the single-ended and differential conversion circuit are arranged in each converter in the plurality of converters;
the single-ended and differential conversion circuit is positioned in the same converter with the main controller and is used for converting the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a single-ended signal into the carrier synchronous clock signal which is output by the digital circuit module and is in the form of a differential signal;
the bidirectional transmission bus is used for transmitting the carrier synchronous clock signal in the form of a differential signal to each single-ended and differential conversion circuit which is positioned in the same converter with the slave controller; the method comprises the steps of,
and each single-end and differential conversion circuit which is positioned in the same converter with the slave controller is used for converting the carrier synchronous clock signal in the form of differential signals into the carrier synchronous signal in the form of single-end signals and transmitting the carrier synchronous signal to the slave controller.
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| CN115701696B (en) * | 2021-08-02 | 2025-03-18 | 中车株洲电力机车研究所有限公司 | A carrier modulation device |
| CN113517975B (en) * | 2021-09-13 | 2021-12-07 | 天津飞旋科技股份有限公司 | Carrier synchronization control method, system, converter device and readable storage medium |
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| CN102123117B (en) * | 2010-01-07 | 2013-07-17 | 无锡爱睿芯电子有限公司 | Modulation device and method |
| CN103219904B (en) * | 2013-04-10 | 2014-12-17 | 哈尔滨工程大学 | Method for synchronously controlling parallel connection of three-phase inverter |
| KR101491933B1 (en) * | 2013-11-19 | 2015-02-09 | 엘에스산전 주식회사 | Apparatus for controlling paralleled inverter |
| CN104486059B (en) * | 2015-01-04 | 2018-07-03 | 阳光电源股份有限公司 | A kind of photovoltaic DC-to-AC converter parallel system carrier synchronization method and device |
| CN104539183B (en) * | 2015-01-16 | 2017-08-15 | 湘潭电机股份有限公司 | The control device and method of inverter parallel system based on pulsewidth modulation reconstructed wave |
| CN104950765B (en) * | 2015-06-23 | 2017-09-22 | 合肥工业大学 | A kind of inverter parallel system and its carrier synchronization method based on CAN |
| CN107359900B (en) * | 2017-07-28 | 2019-11-05 | 中国电子科技集团公司第五十四研究所 | A kind of modem suitable for overlength distance scattering link |
| CN107834817B (en) * | 2017-11-10 | 2020-05-22 | 阳光电源股份有限公司 | Control method and control system for parallel operation of converters |
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| CN108377002B (en) * | 2018-05-09 | 2019-12-17 | 北京交通大学 | Switching harmonic suppression method for inverter parallel system and inverter parallel system |
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