CN113541187A - Intermediate frequency sine wave alternating current power supply parallel operation system and control system thereof - Google Patents
Intermediate frequency sine wave alternating current power supply parallel operation system and control system thereof Download PDFInfo
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- CN113541187A CN113541187A CN202110787001.5A CN202110787001A CN113541187A CN 113541187 A CN113541187 A CN 113541187A CN 202110787001 A CN202110787001 A CN 202110787001A CN 113541187 A CN113541187 A CN 113541187A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a parallel operation system of an intermediate-frequency sine wave alternating-current power supply and a control system thereof, wherein the parallel operation system comprises an intermediate-frequency sine wave power supply host and a plurality of intermediate-frequency sine wave power supply slave machines; the intermediate-frequency sine wave power supply host and all the intermediate-frequency sine wave power supply slave machines are provided with a parallel machine input interface and a parallel machine output interface; the parallel machine output interface of the medium-frequency sine wave power supply host machine is connected with the parallel machine input interface of the first medium-frequency sine wave power supply slave machine; the parallel operation output interface of the first intermediate-frequency sine wave power supply slave machine is connected with the parallel operation input interface of the second intermediate-frequency sine wave power supply slave machine, and so on, and the parallel operation output interface of the (N-1) th intermediate-frequency sine wave power supply slave machine is connected with the parallel operation input interface of the Nth intermediate-frequency sine wave power supply slave machine; n is the total number of the slave machines of the medium-frequency sine wave power supply, and N is more than 1. The parallel operation system does not need to increase an interface corresponding to each slave computer for the host computer structure, and solves the problem of capacity expansion limitation in the prior art.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to a medium-frequency sine wave alternating current power supply parallel operation system and a control system thereof.
Background
The medium-frequency sine wave alternating-current power supply has stable and reliable work, high coating quality and compact and uniform film layer, is widely applied in the field of coating, and particularly applied in the field of coating of solar cells, and obviously improves the film forming quality. With the development of the coating technology, the coating equipment further improves the productivity, the requirement on the power of the coating power supply is higher and higher, and the development of the medium-frequency sine wave alternating current power supply cannot keep up with the requirement on the capacity expansion of the coating equipment at present, so that the parallel use of the medium-frequency sine wave alternating current power supply is a flexible and effective solution.
The medium-frequency sine wave alternating current power supply can not be simply connected in parallel, and relates to the problem of amplitude and phase synchronization of output voltages of power supplies in a parallel system, in particular to the problem that the phase consistency needs to be kept, the phases are inconsistent, and the parallel system cannot work normally. In the prior art, a main machine power supply main control board generally sends out a PWM control signal through an optical fiber, and slave machines receive signals in parallel, so that the purpose of parallel operation is achieved. The main power supply main control board is limited in physical space, the number of power supplies which can be connected in parallel is limited, namely the number of the power supplies which are connected in parallel is limited, and the optical fiber interfaces with the same number need to be arranged on the main power supply main control board of the main machine, so that the capacity expansion capacity is limited.
Disclosure of Invention
The invention aims to solve the technical problem of providing a medium-frequency sine wave alternating current power supply parallel operation system capable of connecting a plurality of power supplies in parallel and a control system thereof aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a kind of medium frequency sine wave AC power supply parallel operation system includes:
a medium-frequency sine wave power supply host;
a plurality of slave machines of medium-frequency sine wave power supplies;
the intermediate-frequency sine wave power supply host and all the intermediate-frequency sine wave power supply slave machines are provided with a parallel machine input interface and a parallel machine output interface;
the parallel machine output interface of the medium-frequency sine wave power supply host machine is connected with the parallel machine input interface of the first medium-frequency sine wave power supply slave machine; the parallel operation output interface of the first intermediate-frequency sine wave power supply slave machine is connected with the parallel operation input interface of the second intermediate-frequency sine wave power supply slave machine, and so on, and the parallel operation output interface of the (N-1) th intermediate-frequency sine wave power supply slave machine is connected with the parallel operation input interface of the Nth intermediate-frequency sine wave power supply slave machine; n is the total number of the slave machines of the medium-frequency sine wave power supply, and N is more than 1;
the output voltage amplitude and the phase of the medium-frequency sine wave power supply host and the output voltage amplitude and the phase of all the medium-frequency sine wave power supply slaves are consistent.
The intermediate-frequency sine wave power supply host and each intermediate-frequency sine wave power supply are provided with the parallel input interface and the parallel output interface, so that the host does not need to additionally increase the interfaces during parallel operation, the problems that a parallel operation system is limited by the physical space of a main control board of the main power supply in the prior art and the capacity expansion capacity is limited are solved, and the parallel operation system can be connected with enough power supplies in parallel according to actual use requirements.
And power output interfaces of the intermediate-frequency sine wave power supply host and the 1 st to Nth intermediate-frequency sine wave power supply slave are connected with a load. The parallel operation system can carry different loads and has wide application range. Meanwhile, the intermediate-frequency sine wave power supply host and the N intermediate-frequency sine wave power supply slave machines of the parallel operation system can be used in parallel and can be used in a single machine, and the application is flexible.
The medium-frequency sine wave power supply host and all the medium-frequency sine wave power supply slave machines are provided with user monitoring interfaces. The user monitoring interface can be connected with a display screen, so that the output characteristics of the power supply can be detected conveniently, and the amplitude and the phase of the output voltage of each power supply can be further ensured to be consistent.
The internal circuit structures of the medium-frequency sine wave power supply host and all the medium-frequency sine wave power supply slaves are the same; the internal circuit includes a parallel circuit. The parallel operation system has the advantages that the master-slave circuits are completely the same, the master-slave circuits can be master-slave machines, the field arrangement is flexible, and the use is convenient.
The parallel operation circuit is connected with the control circuit; the control circuit is connected with the switch circuit and the sampling circuit; the switch circuit is connected with the filter circuit and the output circuit in sequence; the output circuit is connected with the sampling circuit. The control circuit can control the output voltage amplitude and phase of the master and slave machines to be consistent.
The control circuit and the sampling circuit are also connected with the protection circuit. The protection circuit can prevent the output power of each power supply in the parallel system from being overlarge to cause load damage, and can prolong the service life of each power supply.
In order to ensure that the output voltage amplitude and the phase of each power supply in the parallel operation system are consistent, the parallel operation circuit comprises an input optical coupler and an output optical coupler; the input optical coupler and the output optical coupler are both connected with the transceiver; the transceiver is connected with the first solid-state relay and the third solid-state relay; the first solid state relay is connected with the second solid state relay.
The output optocoupler is connected with the transceiver through a first current limiting resistor.
And the input optocoupler is connected with a power supply through a second current-limiting resistor.
The invention also provides a control method of the intermediate-frequency sine wave alternating current power supply parallel operation system, which comprises the following steps:
for the intermediate-frequency sine wave power supply host, a PWM signal generated by a control circuit of the intermediate-frequency sine wave power supply host is used as a signal source of the intermediate-frequency sine wave power supply host, a first solid-state relay is conducted, and a PWM control signal of the host is transmitted to a second solid-state relay of a first intermediate-frequency sine wave power supply slave through a parallel cable by a third solid-state relay;
for a first intermediate-frequency sine wave power supply slave machine, an input optical coupler shields a PWM signal generated by a control circuit of the first intermediate-frequency sine wave power supply slave machine, a first solid-state relay is not conducted, a PWM control signal output by a second solid-state relay is transmitted to an output optical coupler through a transceiver, and then enters the control circuit of the first intermediate-frequency sine wave power supply slave machine through the output optical coupler to serve as a PWM control signal source of the first intermediate-frequency sine wave power supply slave machine; meanwhile, PWM control signals of the first intermediate-frequency sine wave power supply slave machine are transmitted to a second solid-state relay of a second intermediate-frequency sine wave power supply slave machine through a third solid-state relay through a parallel cable;
and repeating the steps until the PWM control signal of the (N-1) th intermediate frequency sine wave power supply slave machine is transmitted to the second solid state relay of the Nth intermediate frequency sine wave power supply slave machine through the third solid state relay through the parallel operation cable. All the slave machines of the medium-frequency sine wave power supply use the same PWM control signal as the master machine, and the purpose of outputting the same phase and frequency is achieved.
The PWM control signal transmission mode ensures the consistency of the PWM control signals of the master machine and the slave machine, thereby ensuring the consistency of the amplitude and the phase of the output voltage of each power supply in the parallel machine system. The invention ensures the consistency of the output voltage amplitude and the phase of each power supply through the solid-state relay, has simple control and high reliability, and can wirelessly expand the number of slave machines through parallel cables, thereby realizing high-power output.
Compared with the prior art, the invention has the beneficial effects that:
1. the parallel operation system does not need to increase an interface corresponding to each slave computer for the host computer structure, thereby solving the problem of capacity expansion limitation in the prior art;
2. the power supply in the parallel operation system can be used in parallel or in a single machine, and the application is flexible;
3. the parallel operation system has completely the same master-slave circuit, can be used as master and slave machines, and is flexible in field arrangement;
4. the invention ensures the consistency of the PWM control signals of the master and slave machines through the solid-state relay, thereby ensuring the consistency of the amplitude and the phase of the output voltage of each power supply in the parallel system and having simple and reliable control.
Drawings
FIG. 1 is a block diagram of a parallel operation system according to an embodiment of the present invention;
FIG. 2 is a diagram of a parallel operation circuit and a power circuit according to an embodiment of the present invention;
FIG. 3 is a signal transmission diagram of a parallel operation circuit of the parallel operation system according to an embodiment of the present invention;
wherein: the system comprises a 1-optical coupler I, a 2-resistor I, a 3-solid-state relay I, a 4-solid-state relay II, a 5-solid-state relay III, a 6-multipoint bus transceiver and a 7-optical coupler II and a 8-resistor II.
Detailed Description
As shown in fig. 1, the intermediate frequency sine wave power supply parallel operation system provided by the present invention includes: the system comprises a medium-frequency sine wave alternating-current power supply host machine, a plurality of medium-frequency sine wave alternating-current power supply slave machines (N machines) and a parallel machine cable. Each power supply comprises a parallel machine input interface and a parallel machine output interface (IO interface). The parallel operation output interface of the master machine is connected with the parallel operation input interface of the slave machine 1 (namely, the first slave machine of the intermediate-frequency sine wave alternating-current power supply) through a parallel operation cable, the parallel operation interfaces of the multiple slave machines are connected through the parallel operation cable (the parallel operation output interface of the first slave machine of the intermediate-frequency sine wave alternating-current power supply is connected with the parallel operation input interface of the second slave machine of the intermediate-frequency sine wave alternating-current power supply), and so on. Each power supply is provided with a user interface monitor (the user interface in fig. 1 can be connected with a display screen to display the output state conveniently, and the user interface is connected with an output circuit of the power supply) so as to detect the output characteristic of the power supply and ensure the consistency of the amplitude and the phase of the output voltage of each power supply.
Referring to fig. 1, in the embodiment of the present invention, the intermediate frequency sine wave ac power supply host and the N intermediate frequency sine wave ac power supplies are both provided with a power output interface (the power output interface is connected to an output circuit of the power supply), and the power output interface may be connected to a load. As shown in fig. 1, the power output interfaces of the intermediate frequency sine wave ac power supply master and the 1 st to nth intermediate frequency sine wave ac power supply slaves are connected with the load.
As shown in fig. 2, the master-slave power supplies each include a parallel circuit, a control circuit, a switch circuit, a filter circuit, a sampling circuit, an output circuit, and a protection circuit. The parallel operation circuit of each power supply is interconnected with the system circuit of the power supply, and the control circuit of each power supply receives parallel operation signals of the parallel operation circuit to realize the parallel operation function. Each power supply control circuit controls the switch circuit, the filter circuit, the sampling circuit and the output circuit, and output voltage amplitude and phase of each power supply are consistent.
As shown in fig. 2, for any power supply, the parallel operation circuit is connected with the control circuit, the control circuit is connected with the switch circuit, the sampling circuit and the protection circuit, the switch circuit is connected with the output circuit through the filter circuit, the output circuit is connected with the sampling circuit, and the sampling circuit is connected with the protection circuit.
Referring to fig. 1 and 3, the PWM control signal of the parallel operation circuit of the parallel operation system of the present invention is transmitted as follows: each power supply is defined by Master and Slave to be a host or a Slave.
When a certain power supply is defined as a host, PWM control signals enter a circuit through PWM-in, are subjected to signal isolation through an optical coupler II 7 (input optical coupler), are transmitted to an optical coupler I (output optical coupler) through a multipoint bus transceiver 6, and then enter a control circuit of the host through PWM-out to serve as a PWM control signal source of the host. Because the definition is the host computer, solid state relay I3 (first solid state relay) switches on (the Slave interface of first solid state relay is the low level), and the PWM control signal of solid state relay II 4 (second solid state relay) can not get into the host computer circuit. The PWM control signal of the master may be transmitted to the slave through the solid-state relay iii 5 (third solid-state relay). A resistor I2 (a first current-limiting resistor) and a resistor II 8 (a second current-limiting resistor) in the circuit play a role in limiting current.
When a certain power supply is defined as a slave (hereinafter referred to as slave 1), the optocoupler II 7 shields the PWM-in frequency signal. The solid-state relay I3 is conducted due to the definition of the slave, and a PWM control signal of the solid-state relay II 4 is transmitted to the optical coupler I through the multipoint bus transceiver 6 and then enters a control circuit of the slave through PWM-out to serve as a PWM control signal source of the slave 1. Meanwhile, the PWM control signal of the slave 1 can be transmitted to the solid-state relay II 4 of the slave 2 through the solid-state relay III 5 through the parallel cable.
And so on, the PWM control signal of the slave 2 is transmitted to the slave 3.… … up to slave N.
The PWM control signal transmission mode of the invention ensures the consistency of the frequency signals of the master machine and the slave machine, thereby ensuring the consistency of the amplitude and the phase of each power supply in the parallel machine system.
Claims (10)
1. The utility model provides a medium frequency sine wave alternating current power supply parallel operation system which characterized in that includes:
a medium-frequency sine wave power supply host;
a plurality of slave machines of medium-frequency sine wave power supplies;
the intermediate-frequency sine wave power supply host and all the intermediate-frequency sine wave power supply slave machines are provided with a parallel machine input interface and a parallel machine output interface;
the parallel machine output interface of the medium-frequency sine wave power supply host machine is connected with the parallel machine input interface of the first medium-frequency sine wave power supply slave machine; the parallel operation output interface of the first intermediate-frequency sine wave power supply slave machine is connected with the parallel operation input interface of the second intermediate-frequency sine wave power supply slave machine, and so on, and the parallel operation output interface of the (N-1) th intermediate-frequency sine wave power supply slave machine is connected with the parallel operation input interface of the Nth intermediate-frequency sine wave power supply slave machine; n is the total number of the slave machines of the medium-frequency sine wave power supply, and N is more than 1;
the output voltage amplitude and the phase of the medium-frequency sine wave power supply host and the output voltage amplitude and the phase of all the medium-frequency sine wave power supply slaves are consistent.
2. The intermediate-frequency sine wave alternating-current power supply parallel operation system according to claim 1, wherein power output interfaces of the intermediate-frequency sine wave power supply master machine and the 1 st to Nth intermediate-frequency sine wave power supply slave machines are connected with a load.
3. The medium-frequency sine wave alternating-current power supply parallel operation system according to claim 1, wherein the medium-frequency sine wave power supply master machine and all the medium-frequency sine wave power supply slave machines are provided with user monitoring interfaces.
4. The medium-frequency sine wave alternating-current power supply parallel operation system according to claim 1, wherein the internal circuit structures of the medium-frequency sine wave power supply master machine and all the medium-frequency sine wave power supply slave machines are the same; the internal circuit includes a parallel circuit.
5. The intermediate-frequency sine wave alternating current power supply parallel operation system according to claim 4, wherein the parallel operation circuit is connected with a control circuit; the control circuit is connected with the switch circuit and the sampling circuit; the switch circuit is connected with the filter circuit and the output circuit in sequence; the output circuit is connected with the sampling circuit.
6. The intermediate-frequency sine wave alternating current power supply parallel operation system according to claim 5, wherein the control circuit and the sampling circuit are further connected with a protection circuit.
7. The medium-frequency sine wave alternating current power supply parallel operation system according to any one of claims 4 to 6, wherein the parallel operation circuit comprises an input optical coupler and an output optical coupler; the input optical coupler and the output optical coupler are both connected with the transceiver; the transceiver is connected with the first solid-state relay and the third solid-state relay; the first solid state relay is connected with the second solid state relay.
8. The mid-frequency sine wave ac power parallel operation system according to claim 7, wherein the output optocoupler is connected to the transceiver through a first current limiting resistor.
9. The mid-frequency sine wave ac power parallel operation system according to claim 7, wherein said input optocoupler is connected to the power supply through a second current limiting resistor.
10. A control method of the intermediate frequency sine wave ac power supply parallel operation system according to any one of claims 7 to 9, characterized in that:
for the intermediate-frequency sine wave power supply host, a PWM control signal generated by a control circuit of the intermediate-frequency sine wave power supply host is used as a control signal of the intermediate-frequency sine wave power supply host, a first solid-state relay is conducted, and the PWM control signal of the host is transmitted to a second solid-state relay of a first intermediate-frequency sine wave power supply slave through a parallel cable by a third solid-state relay;
for a first intermediate-frequency sine wave power supply slave machine, an input optical coupler shields a PWM control signal generated by a control circuit of the first intermediate-frequency sine wave power supply slave machine, a first solid-state relay is not conducted, a PWM control signal output by a second solid-state relay is transmitted to an output optical coupler through a transceiver, and then enters the control circuit of the first intermediate-frequency sine wave power supply slave machine through the output optical coupler to serve as the PWM control signal of the first intermediate-frequency sine wave power supply slave machine; meanwhile, the PWM control signal of the first intermediate-frequency sine wave power supply slave machine is transmitted to a second solid-state relay of a second intermediate-frequency sine wave power supply slave machine through a third solid-state relay;
and repeating the steps until the PWM control signal of the (N-1) th intermediate frequency sine wave power supply slave machine is transmitted to the second solid state relay of the Nth intermediate frequency sine wave power supply slave machine through the third solid state relay.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022129313B3 (en) | 2022-06-24 | 2024-03-21 | Chyng Hong Electronic Co., Ltd. | MASTER-SLAVE COMMUNICATION SYSTEM FOR SINGLE-PHASE TO MULTIPHASE AC POWER SUPPLY |
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