CN109639114B - Dual-channel power supply system and parallel operation method thereof - Google Patents

Dual-channel power supply system and parallel operation method thereof Download PDF

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Publication number
CN109639114B
CN109639114B CN201811598692.9A CN201811598692A CN109639114B CN 109639114 B CN109639114 B CN 109639114B CN 201811598692 A CN201811598692 A CN 201811598692A CN 109639114 B CN109639114 B CN 109639114B
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power
parallel operation
channel
current
line
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CN109639114A (en
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蔡晓
雷晓
周随影
毛建华
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Xi'an Stropower Rapid Charging Technology Co ltd
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Xi'an Stropower Rapid Charging Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The double-channel power supply system and the parallel operation method thereof provided by the invention have the advantages that the double-channel power supply system provided by the invention can realize the mutual conversion of the independent working mode and the parallel operation working mode as long as the working state of the related line switch is set through the control system, no additional hardware facility is needed to be added or reduced, and the application range of the power supply system provided by the invention is wider compared with the simple parallel operation system and the independent working power supply system; according to the parallel operation method of the dual-channel power supply system, the host machine and the slave machine can be judged by setting the line switch and the current sensor to acquire current data, and compared with a software mode for judging the host machine and the slave machine, the parallel operation method is more reliable and more convenient, the parallel operation output precision is higher, and the current control algorithm is simpler.

Description

Dual-channel power supply system and parallel operation method thereof
Technical Field
The invention relates to a power supply system and a parallel operation method thereof, in particular to a dual-channel power supply system and a parallel operation method thereof.
Background
When power is supplied to a load, the load sometimes exceeds the current output by a single power supply, and at this time, the requirement of the load on the current can be met by adopting a dual-channel parallel operation method. In addition, in the parallel operation method of the power supply system in the prior art, when the master machine and the slave machine in the dual-channel power supply are confirmed, the power supply needs to be detached, the steps are complex, and the workload is large during parallel operation.
Therefore, a dual-channel power supply system in the prior art can only work in one of two states of independently outputting two currents or outputting parallel current, and cannot be flexibly changed according to the change of a load, so that the power supply system is small in application range and low in practicability.
Disclosure of Invention
The invention aims to provide a dual-channel power supply system and a parallel operation method thereof, which are used for solving the problem that the power supply system in the prior art can only work in one working state and can not be flexibly changed according to the change of a load.
In order to realize the task, the invention adopts the following technical scheme:
a dual-channel power supply system supplies a parallel operation total current or two output currents to a load according to a parallel operation mode or a non-parallel operation mode selected by a user, and comprises a power supply module, a control system, two power supply channels, a parallel operation selection module and an output module;
the power supply module is used for providing input current;
the control system is used for calculating the control current of each power supply channel according to the current required by the load and the input current selected by the user;
each power supply channel is used for processing the input current according to the control current to obtain the output sub-current of each power supply channel;
the parallel operation selection module is used for superposing the output sub-current of each power supply channel according to the selection of a user to obtain the parallel operation total current;
or respectively outputting the output sub-currents of each power supply channel according to the selection of a user to obtain two output currents;
the output module is used for supplying the parallel machine total current to one load or respectively supplying the two output currents to two loads;
the parallel operation selection module comprises a parallel operation power line and a parallel operation switch arranged on the parallel operation power line, the parallel operation power line is connected with the two power channels, and the parallel operation switch is used for switching on or switching off the connection of the two power channels according to the selection of a user so as to superpose or independently output the output sub-currents of the two power channels.
Furthermore, the parallel operation selection module further comprises a communication parallel operation line and a communication parallel operation switch connected to the communication parallel operation line, the parallel operation communication line is used for being connected with the control system, the communication parallel operation switch is used for switching on or switching off the connection between the parallel operation selection module and the control system according to the selection of a user, and when the user selects two power channels to be in a parallel operation mode, the communication parallel operation switch is switched on; when the user selects the two power channels to be in the non-parallel mode, the communication parallel switch is turned off.
Furthermore, the control system comprises a control host and two control modules;
the control host is used for judging whether the two power supply channels are in a parallel operation mode or a non-parallel operation mode according to the connection or disconnection of the parallel operation switch for communication;
the control module is used for calculating the control current of each power supply channel during parallel operation or calculating the control current of each power supply channel during independent work according to the current required by the load and the input current according to whether the two power supply channels are in a parallel operation mode or a non-parallel operation mode.
Furthermore, the power channel comprises a power conversion module, a positive output line and a negative output line, and the positive output line is also connected with a current sensor;
the power supply conversion module is used for converting the input current into output sub-current according to the control current;
the positive electrode output line and the negative electrode output line are used for transmitting the output sub-current to the output module;
the current sensor is used for measuring the magnitude of the output sub-current in the power supply channel.
Furthermore, the power channel further comprises a plurality of line switches for determining a master or a slave during parallel operation, wherein the line switches comprise a first line switch and a second line switch which are arranged on a positive output line, and a third line switch and a fourth line switch which are arranged on a negative output line;
the first circuit switch and the third circuit switch are used for connecting or disconnecting the power conversion module and the parallel operation power line, and the second circuit switch and the fourth circuit switch are used for connecting or disconnecting the parallel operation selection module and the output module.
A parallel operation method of a dual-channel power supply system is used for carrying out parallel operation on the dual-channel power supply system and is executed according to the following steps:
step 1, selecting the dual-channel power supply system to work in a parallel mode;
step 2, respectively obtaining current values A1 and A2 of the two power channels when the two power channels are independently disconnected with the load;
step 3, if the A1 is larger than the A2, the power channel with the current value A1 is obtained as a master, the other power channel is a slave, otherwise, the power channel with the current value A2 is obtained as the master, and the other power channel is the slave;
step 4, determining the output current value of the power channel of the slave;
and 5, subtracting the output current value of the power channel of the slave from the current value required by the load to obtain the output current value of the power channel of the master, and finishing the parallel operation.
Further, when the power channel output current value of the slave is determined in step 4, a ratio of the power channel output current of the slave to the current required by the load is determined, and the power channel output current value of the slave is determined according to the ratio of the power channel of the slave.
Compared with the prior art, the invention has the following technical effects:
1. the double-channel power supply system provided by the invention has the advantages that the parallel operation mode and the non-parallel operation mode are flexibly converted, hardware devices are not required to be increased or reduced, and the conversion can be realized only by closing the parallel operation switch in the parallel operation selection module;
2. according to the parallel operation method of the dual-channel power supply system, the power supply channel and the load are only required to be adjusted to be connected or disconnected during parallel operation, the host and the slave can be quickly and conveniently determined by obtaining the current value of the power supply channel, and compared with a software mode, the method for judging the host and the slave is more reliable and more convenient.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a dual channel power supply system according to the present invention;
FIG. 2 is a schematic diagram of the overall structure of a dual channel power supply system provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a power channel 4 provided in an embodiment of the present invention;
FIG. 4 is a schematic diagram of an overall structure of a dual channel power system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an overall structure of a dual channel power supply system according to an embodiment of the present invention.
The reference numbers in the figures represent: 1-a main power supply, 2-an input power supply line, 3-an output power supply line, 4-a power supply channel, 5-a control module, 6-an output anode, 7-an output cathode, 8-a control host, 9-a communication line, 10-a parallel machine selection module, (4-1) -a power supply conversion module, (4-2) -an anode output line, (4-3) -a cathode output line, (4-4) -a current sensor, (4-5) -a first line switch, (4-6) -a second line switch, (4-7) -a third line switch, (4-8) -a fourth line switch, (4-1-1) -an analog-to-digital conversion sub-module, (4-1-2) -a digital-to-analog sampling sub-module, (4-1-3) -power circuit submodule, (10-1) -communication parallel machine line, (10-2) -power parallel machine line, (10-2-1) -positive parallel machine line, (10-2-2) -negative parallel machine line, (10-3) -communication parallel machine switch, (10-4) -positive parallel machine switch, (10-5) -negative parallel machine switch, A4-power channel A, (A4-1) -power channel A power conversion module, (A35 4-2) -power channel A positive output line, (A4-3) -power channel A negative output line, (A4-4) -power channel A current sensor, (A4-5) -power channel A first line switch, (a4-6) -power channel a second line switch, (a4-7) -power channel a third line switch, (a4-8) -power channel a fourth line switch, B4-power channel B, (B4-1) -power channel B power conversion module, (B4-2) -power channel B positive output line, (B4-3) -power channel B negative output line, (B4-4) -power channel B current sensor, (B4-5) -power channel B first line switch, (B4-6) -power channel B second line switch, (B4-7) -power channel B third line switch, (B4-8) -power channel B fourth line switch.
Detailed Description
Power supply parallel operation: when the current required by the load is large and a single power supply cannot provide large current, the currents of the multiple power supplies are superposed together and output.
The following are specific examples provided by the inventors to further explain the technical solutions of the present invention.
Example one
The embodiment discloses a dual-channel power supply system, which is used for providing parallel-connected total current of a dual-channel power supply for a single load or providing two output currents of the dual-channel power supply for two loads respectively according to user selection.
The dual-channel power supply system provided in this embodiment is different from an existing dual-channel power supply system in that the dual-channel power supply system can work in a parallel mode and also can work in an output state of an independent power supply channel, rather than that the power supply channel cannot work alone after parallel lines are connected in the prior art.
The dual-channel power supply system comprises a power supply module, a control system, two power supply channels 4, a parallel operation selection module 10 and an output module;
in this embodiment, the control system, the parallel operation selection module and the power channels 4 are all connected together, the parallel operation selection module 10 is used as a module for changing the state according to the selection of a user, and tells the control system whether to work in the parallel operation mode or the independent state at the moment, the parallel operation selection module 10 changes the state of the parallel operation selection module to be the parallel operation mode or the independent operation mode, the control system calculates the output sub-current of each power channel 4 according to the working state that the power system should be in at the moment, the control system tells the power channel 4 how much output sub-current should be output, the power channel 4 only needs to complete the instruction according to the control system, the output sub-current can be output, and the power supply module and the output module are the input and the output in the power system.
The power supply module is used for providing input current;
the power supply module comprises a main power supply 1 and an input power line 2;
the main power supply 1 is used for providing input current;
the input power line 2 is used for inputting the input current into the two power channels 4.
In the present embodiment, the main power source 1 is connected to an external ac or dc power source for obtaining an input current, and the input power line 2 inputs the current into the power system to supply power to each power channel 4, so that the input power line 2 is respectively connected to two power channels 4 to supply the input current to the power channels 4.
The parallel operation selection module 10 is configured to superimpose the output sub-currents of each power channel 4 according to user selection to obtain a parallel operation total current;
or respectively outputting the output sub-currents of each power channel 4 according to the selection of a user to obtain two output currents;
the parallel operation selection module 10 comprises a parallel operation power line 10-2 and a parallel operation switch arranged on the parallel operation power line 10-2, the parallel operation power line 10-2 is connected with the two power channels 4, and the parallel operation switch is used for switching on or switching off the connection of the two power channels 4 according to the selection of a user so as to superpose or independently output the output sub-currents of the two power channels 4.
In the embodiment, the parallel operation selection module 10 is used for performing parallel operation or independent operation according to user selection, wherein when parallel operation is performed, the switches on the parallel power lines 10-2 are closed, and the parallel power lines 10-2 are connected between the positive output lines 4-2 and the negative output lines 4-3 of the two power channels 4. When the power channels 4 work independently, the parallel switches on the parallel power lines 10-2 are all turned on, no physical connection exists at the moment, and the two power channels 4 can only work in an independent state.
Optionally, the parallel operation selection module 10 further includes a parallel operation communication line 10-1 and a parallel operation communication switch 10-3 connected to the parallel operation communication line 10-1, the parallel operation communication line 10-1 is used for connecting to the control system, the parallel operation communication switch 10-3 is used for switching on or off the connection between the parallel operation selection module 10-3 and the control system according to the selection of the user, and when the user selects two power channels 4 to be in the parallel operation mode, the parallel operation communication switch 10-3 is switched on; when the user selects the two power channels 4 to be in the non-parallel mode, the parallel switch 10-3 for communication is turned off.
In this embodiment, when the parallel operation switch 10-3 for communication is turned on, the control system calculates the control current of each power channel 4 during parallel operation according to the current required by the load and the input current; when the parallel operation switch 10-3 for communication is turned off, the control system calculates the control current when each power channel 4 works independently according to the current required by the load and the input current.
The control system is used for calculating the control current of each power channel 4 according to the current required by the load and the input current selected by the user;
the control system is operative to calculate for each power channel 4 the sub-current it should output, i.e. to control the value of the power channel 4 output current.
Optionally, the control system includes a control host 8 and two control modules 5;
the control host 8 is used for judging whether the two power channels 4 are in a parallel operation mode or a non-parallel operation mode according to the connection or disconnection of the parallel operation switch 10-3 for communication;
the control module 5 is configured to calculate a control current of each power channel 4 during parallel operation or calculate a control current of each power channel 4 during independent operation according to a current required by a load and the input current, according to whether the two power channels 4 are in a parallel operation mode or a non-parallel operation mode.
In this embodiment, the control system includes a control host 8, a communication line 9, and two control modules 5, where each control module 5 is connected to one power channel 4, and is configured to control an output sub-current of the power channel 4; the control host 8 is connected with the two control modules 5 through a communication line 9, the control host 8 is used for being connected with the parallel operation selection module 10, the working state of the power channel 4 selected by the current user is judged, and the control module 5 adjusts the control current of each power channel 4 according to the working state of the power channel 4.
Each power channel 4 is configured to process the input current according to the control current to obtain an output sub-current of each power channel 4;
the function of the power supply channel 4 is to convert the input current into a target output sub-current, which is obtained by the control system.
Optionally, the power channel 4 includes a power conversion module 4-1, a positive output line 4-2 and a negative output line 4-3, and the positive output line 4-2 is further connected with a current sensor 4-4;
the power conversion module 4-1 is used for converting the input current into an output sub-current according to the control current;
the positive output line 4-2 and the negative output line 4-3 are used for transmitting output sub-current to the output module;
the current sensor 4-4 is used for measuring the magnitude of the output sub-current in the power supply channel 4.
In this embodiment, to convert the input current into the target output sub-current, first, the current channel 4 includes a power conversion module 4-1 for converting the current, for example, in a parallel mode, the input is 100A, the target output sub-current of one of the power channels 4 is 40A, and then the power conversion module 4-1 functions to adjust the current of 100A through the power circuit and output the output sub-current of 40A.
After the output sub-current is obtained, the sub-current is also output from the power supply channel 4, and therefore, a positive electrode output line and a negative electrode output line are provided.
However, the power channel 4 needs to monitor the output sub-current, so a current sensor 4-4 is provided, and the current sensor 4-4 is configured to monitor the output sub-current on the power channel 4 when the power channel 4 is in the non-parallel mode, or monitor the magnitude of the output sub-current on the current channel 4 when the power channel 4 is in the parallel mode, so as to determine the master and the slave, because after parallel operation, the current value of one of the power channels 4 is larger than the current value of the other power channel 4, so the current sensor 4-4 is configured to measure the magnitude of the output sub-current in the power channel 4 where the current sensor is located, and the output sub-current includes the current after parallel operation.
Optionally, the power channel 4 further includes a plurality of line switches for determining a master or a slave during parallel operation, where the line switches include a first line switch 4-5 and a second line switch 4-6 disposed on the positive output line 4-2, and a third line switch 4-7 and a fourth line switch 4-8 disposed on the negative output line 4-3;
the first line switch 4-5 and the third line switch 4-7 are used for connecting or disconnecting the power conversion module 4-1 and the parallel machine power line 10-2, and the second line switch 4-6 and the fourth line switch 4-8 are used for connecting or disconnecting the parallel machine selection module and the output module.
In this embodiment, in order to quickly determine the master and the slave during parallel operation, two line switches are respectively disposed on the positive output line 4-2 and the negative output line 4-3 of the power channel 4, when the power conversion module 4-1 is disconnected from the parallel operation power line 10-2, even if in the parallel operation mode at this time, the output sub-current of one of the power channels 4 cannot be output, but if one of the power conversion modules 4-1 is connected with the parallel operation power line 10-2, a current value is still detected on the current sensor of the power channel 4, which indicates that the output sub-current of the other power channel 4 is on the power channel 4, the power channel 4 is the master, and the other is the slave.
To ensure that the parallel operation selection module 10 can quickly determine the master and the slave when the power system is in the parallel operation mode, the parallel operation power line 10-2 includes a positive parallel operation line 10-2-1 and a negative parallel operation line 10-2-2, and the parallel operation switch includes a positive parallel operation switch 10-4 and a negative parallel operation switch 10-5. One end of the positive parallel machine line 10-2-1 is connected to the front end of the current sensor 4-4 on the positive output line 4-2 of one power supply channel 4, and the other end is connected to the rear end of the current sensor 4-4 on the positive output line 4-2 of the other power supply channel 4, so that the current sensor 4-4 can detect the current after parallel machine, and can cooperate with a line switch for determining a master machine or a slave machine to quickly determine the master machine and the slave machine in parallel machine.
The output module is used for supplying the parallel machine total current to one load or respectively supplying the two output currents to two loads;
the output module comprises an output power line 3, and the output power line 3 is connected with a power channel 4 and used for outputting current to a load.
In the dual-channel power supply system provided in this embodiment, in the parallel operation mode, after the parallel operation switches in the parallel operation selection module are closed, the first line switch 4-5, the second line switch 4-6, the third line switch 4-7, and the fourth line switch 4-8 on one of the power channels 4 are closed, the first line switch 4-5 and the third line switch 4-7 on the other power channel 4 are closed, and the second line switch 4-6 and the fourth line switch 4-8 are opened, so that the dual-channel power supply system can operate in the parallel operation mode.
In the non-parallel mode, after the parallel switch in the parallel selection module is switched off, the first line switch 4-5, the second line switch 4-6, the third line switch 4-7 and the fourth line switch 4-8 on the beam power channels 4 are respectively closed, and the parallel selection module can work in the non-parallel mode.
In the dual-channel power supply system provided in this embodiment, the non-parallel mode and the parallel mode can be mutually converted by setting the operating states of the relevant line switches without additionally increasing or reducing hardware facilities, and the application range is wider compared with that of a simple power supply parallel system and an independent operating power supply system.
Example two
The embodiment discloses a specific composition structure of a dual-channel power supply system, which comprises a main power supply 1, an input power supply line 2, an output power supply line 3, an output anode 6, an output cathode 7, a control host 8, a communication line 9, two power supply channels 4, two control modules 5 and a parallel operation selection module 10, wherein the output anode 6 and the output cathode 7 are respectively connected with the anode and the cathode of a load;
the main power supply 1 is respectively connected with two power supply channels 4 through an input power line 2;
the power supply channel 4 is connected with the output anode 6 and the output cathode 7 through an output power line 3;
the control host 8 is respectively connected with the two control modules 5 through the communication lines 9, and the control modules 5 are also connected with the power supply channel 4;
the two power channels 4 are connected through the parallel operation selection module 10, and the parallel operation selection module 10 comprises a communication parallel operation line 10-1 and a power parallel operation line 10-2;
two ends of the communication parallel machine line 10-1 are respectively connected with two control modules 5, and two ends of the power supply parallel machine line 10-2 are respectively connected with two power supply channels 4.
In the present embodiment, the dual channel power system includes a power supply module, a power channel 4, a control system, an output module, and a parallel operation selection module 10.
The power supply module is connected with the power channel 4 and used for providing current for the whole system, and comprises a main power supply 1 and an input power line 2 connected with the main power supply, wherein the main power supply 1 is used for providing an input power supply for the power system, and the input power line 2 is used for transmitting the current output by the main power supply to the power channel 4;
the control system is connected with the power channel 4 and used for controlling the output current of the power channel 4, the control system 4 sets an output current value for the power channel 4 and receives the current value of a current sensor on each power channel 4 sent by the power channel 4, the current control system comprises a control host 8, a communication line 9 and two control modules 5, wherein the control host 8 is used as the core of the whole power system and performs comparison and calculation of current data and sending of a control command, the control host 8 sends a command for setting the current to the two control modules through the communication line 9, the two control modules 5 receive the command from the control host 8, and the control modules 5 are further connected with the power channel 4 and used for setting the output current of the power channel 4 according to the command of the control host 8.
The power channel 4 is connected with the output module and used for outputting current according to the instruction of the control system and feeding back the output current value to the control system.
The output module is used for providing current for a load, the output module comprises an output power line 3, an output anode 6 and an output cathode 7, and the output anode 6 and the output cathode 7 are respectively connected with the anode and the cathode of the load.
As shown in fig. 2, the parallel operation selection module 10 serves as a core of the system and is configured to connect two power channels 4 together, the parallel operation selection module 10 includes a communication parallel operation line 10-1 and a power parallel operation line 10-2, the communication parallel operation line 10-1 is configured to connect two control modules 5 together to implement communication of the two control modules 5, and the power parallel operation line 10-2 is configured to connect the two power channels 4 together to implement current parallel operation.
In this embodiment, the parallel operation selection module is used to connect the two power channels 4 together, so that the output currents of the two power channels 4 are superposed, thereby simplifying the parallel operation process and improving the parallel operation efficiency.
Optionally, the power channel 4 includes a power conversion module 4-1, a positive output line 4-2, and a negative output line 4-3, the power conversion module 4-1 is connected to the positive output line 4-2 and the negative output line 4-3, respectively, and the positive output line 4-2 is further connected to a current sensor 4-4;
the control module 5 is connected with the power conversion module 4-1, and the positive output line 4-2 and the negative output line 4-3 are connected with the power output line 3;
the power supply parallel machine line 10-2 comprises a positive electrode parallel machine line 10-2-1 and a negative electrode parallel machine line 10-2-2, and the negative electrode parallel machine line 10-2-2 is respectively connected with the negative electrode output lines 4-3 of the two power supply channels 4;
one end of the positive parallel machine line 10-2-1 is connected to the front end of the current sensor 4-4 on the positive output line 4-2 of one power channel 4, and the other end is connected to the rear end of the current sensor 4-4 on the positive output line 4-2 of the other power channel 4.
In this embodiment, as shown in fig. 2 and 3, the power channel 4 includes a power conversion module 4-1, a positive output line 4-2, a negative output line 4-3, and a current sensor 4-4, where the power conversion module 4-1 is configured to convert an input current into an output current, and is further configured to receive current data of the current sensor 4-4 and send the current data to the control module 5, and the current sensor 4-4 is configured to collect a current value in the power channel 4.
When the power supply parallel machine line 10-2 is connected to the two power supply channels 4, in order to realize quick determination of the master machine and the slave machine, one end of the positive pole parallel machine line 10-2-1 is connected to the front end of one current sensor 4-4, and the other end of the positive pole parallel machine line is connected to the rear end of the other current sensor 4-4, when parallel machine is performed, one current sensor 4-4 can detect the total current after parallel machine, the other current sensor 4-4 detects the current value of the current channel 4, the current channel 4 of the positive pole parallel machine line 10-2-1 connected to the front end of the current sensor 4-4 is the master machine, and the other current channel 4 is the slave machine.
Optionally, the power conversion module 4-1 includes an analog-to-digital conversion sub-module 4-1-1, a digital-to-analog sampling sub-module 4-1-2, and a power circuit sub-module 4-1-3;
one end of the power circuit sub-module 4-1-3 is connected with the main power supply 1, and the other end is respectively connected with the anode output line 4-2 and the cathode output line 4-3;
the analog-to-digital conversion sub-module 4-1-1 is connected with the digital-to-analog sampling sub-module 4-1-2, the analog-to-digital conversion sub-module 4-1-1 is also connected with the control module 5, and the digital-to-analog sampling sub-module 4-1-2 is also connected with the current sensor 4-4.
In this embodiment, as shown in fig. 3, the power conversion module 4-1 includes an analog-to-digital conversion sub-module 4-1-1, a digital-to-analog sampling sub-module 4-1-2 and a power circuit sub-module 4-1-3, wherein the analog-to-digital conversion submodule 4-1-1 and the digital-to-analog sampling submodule 4-1-2 are jointly used for collecting and transmitting the current value of the current sensor 4-4, wherein the digital-analog sampling submodule 4-1-2 is connected with the current sensor 4-4, is used for collecting the current data of the current sensor 4-4, the analog-to-digital conversion submodule 4-1-1 is connected with the control module 5, for converting the output current value measured by the current sensor 4-4 into a form that can be received by the control module 5 and sending the current value to the control module 5; the power circuit sub-module 4-1-3 is used for converting input current into output current, one end of the power circuit sub-module 4-1-3 is connected with the main power supply 1, and the other end of the power circuit sub-module 4-1-3 is connected with the anode output line 4-2 and the cathode output line 4-3.
Optionally, a parallel operation switch 10-3 for communication, a positive parallel operation switch 10-4 and a negative parallel operation switch 10-5 are respectively arranged on the communication parallel operation line 10-1, the positive parallel operation line 10-2-1 and the negative parallel operation line 10-2-2.
The power supply system provided by the invention can not only enable the two power supply channels 4 to work in parallel together, but also enable the two power supply channels 4 to work independently, so that a switch is added on each parallel line in the parallel selection module 10 for controlling the on-off of each parallel line, when all parallel lines are connected, the system works in a parallel mode, when the parallel lines are disconnected, the system works in an independent power supply channel state, and the parallel switch 10-3 for communication can be composed of MOS (metal oxide semiconductor) tubes or integrated devices with low internal resistance, such as a switch device like TPS22921 and is responsible for the on-off of communication cables; the positive parallel operation switch 10-4 and the negative parallel operation switch 10-5 can be composed of elements such as contactors and are used for controlling the connection and disconnection of parallel operation cables.
Optionally, a first line switch 4-5 and a second line switch 4-6 are disposed on the positive output line 4-2 of each power channel 4, and a third line switch 4-7 and a fourth line switch 4-8 are disposed on the negative output line 4-3 of each power channel 4;
the current sensor 4-4 is connected between the first line switch 4-5 and the second line switch 4-6;
two ends of the positive parallel machine line 10-2-1 are respectively connected between the first line switch 4-5 and the second line switch 4-6;
and two ends of the negative parallel machine line 10-2-2 are respectively connected between the third line switch 4-7 and the fourth line switch 4-8.
In this embodiment, as shown in fig. 2, in order to determine the master and the slave quickly and conveniently, two line switches are respectively disposed on the positive output line 4-2 and the negative output line 4-3, and the line switches may be composed of components such as contactors, and are used to control the switches for turning on and off the output positive and negative electrodes of each power channel 4.
In the dual-channel power supply system provided in this embodiment, the independent operating mode and the parallel operation mode can be switched to each other only by setting the operating states of the related line switches through the control system, and no additional hardware is required to be added or reduced, so that the application range of the dual-channel power supply system is wider compared with that of a simple power supply parallel operation system and an independent operating power supply system.
EXAMPLE III
In this embodiment, a method for performing parallel operation on a dual channel power system as in the first embodiment is provided, where the method is performed according to the following steps:
step 1, selecting a dual-channel power supply system to work in a parallel mode;
step 2, respectively obtaining current values A1 and A2 of the two power channels 4 when the two power channels 4 are independently disconnected from the load;
step 3, if the A1 is larger than the A2, the power channel 4 with the current value A1 is taken as a master, the other power channel 4 is taken as a slave, otherwise, the power channel 4 with the current value A2 is taken as the master, and the other power channel 4 is taken as a slave;
step 4, determining the output current value of the power channel 4 of the slave;
further, when the power channel output current value of the slave is determined in step 4, a ratio of the output current of the power channel 4 of the slave to the current required by the load is determined, and the power channel output current value of the slave is determined according to the ratio of the power channel 4 of the slave.
And 5, subtracting the output current value of the power channel 4 of the slave from the current value required by the load to obtain the output current value of the power channel 4 of the master, and finishing the parallel operation.
Example four
In this embodiment, for the parallel operation of the dual-channel power supply system in the second embodiment, the method is performed according to the following steps:
step 1, a main power supply 1 is turned on, and the dual-channel power supply system is electrified;
step 2, setting a parallel operation switch 10-3 for communication and closing the parallel operation switch;
the parallel operation switch comprises a positive parallel operation switch 10-4 and a negative parallel operation switch 10-5.
Step 3, setting a first line switch 4-5, a second line switch 4-6, a third line switch 4-7 and a fourth line switch 4-8 of one power channel 4 of the two power channels 4 to be closed, setting a first line switch 4-5, a second line switch 4-6, a third line switch 4-7 and a fourth line switch 4-8 of the other power channel 4 to be opened, and collecting a current value A1 of a current sensor in the power channel 4 with the closed line switches;
step 4, changing all closed circuit switches in the step 3 into open circuit switches, changing all open circuit switches into closed circuit switches, and collecting the current value A2 of the current sensor in the power channel 4 with the closed circuit switches;
in this embodiment, the execution process of steps 3 and 4 is actually the opposite, and for any power channel 4 of the two power channels 4, all the line switches on the power channel 4 are closed, and the line switch of the other power channel 4 is opened, so that the current is measured twice, and the power values a1 and a2 of the power channel 4 with both the line switches closed are obtained.
Step 5, if the current value A1 acquired in the step 3 is greater than the current value A2 acquired in the step 4, the power supply channels 4 with all closed circuit switches in the step 3 are hosts, and the power supply channels 4 with all open circuit switches are slaves;
if the current value A1 acquired in the step 3 is smaller than the current value A2 acquired in the step 4, the power supply channel 4 with all the open circuit switches in the step 3 is the master, and the power supply channel 4 with all the closed circuit switches is the slave;
step 6, closing a first line switch 4-5, a second line switch 4-6, a third line switch 4-7 and a fourth line switch 4-8 of the power channel 4 set as the host, closing a first line switch 4-5 and a third line switch 4-7 of the power channel 4 set as the slave, and opening a second line switch 4-6 and a fourth line switch 4-8 of the power channel 4 set as the slave;
step 7, determining the output current value of the power channel 4 as a slave;
step 8, subtracting the output current value of the power supply channel 4 as the slave from the current value required by the load to obtain the output current value of the power supply channel 4 as the master;
in this step, for example, 50% of the power is sent to the slave control system by the master control system through the parallel machine communication cable, so that the slave power operates according to a specified target value, and the power is collected by the slave current sensor 5 and sent back to the control system to be displayed by the control master 8. The current parameter value output by the power channel at the host side is the total current after the parallel operation minus the current parameter value set by the slave. In the process of controlling the total current precision after parallel operation, only the current parameter acquired by the current sensor at the host side is considered to participate in the current precision algorithm control, and the current parameter acquired by the current sensor at the slave side does not participate in the current precision algorithm control of the channel power supply of the slave, so the precision control mode is simple in algorithm, the precision is only influenced by one Hall current sensor at the host side, and the current precision after parallel operation is easy to guarantee. Even if the single power supply current outputs of the slave power supply channel and the master power supply channel have deviation, the total current after the slave power supply channel and the master power supply channel are parallel is accurate, and therefore the precision is guaranteed.
And 9, controlling the host to set the output current value of the power supply channel 4 of the host to the power supply channel 4 of the host, and finishing the parallel operation after setting the output current value of the power supply channel 4 of the slave to the power supply channel 4 of the slave.
In addition, the power supply system provided by the invention can also work in a state that two power supply channels are independent, when in the state, the first line switch 4-5, the second line switch 4-6, the third line switch 4-7 and the fourth line switch 4-8 of each power supply channel 4 are set to be closed, the parallel operation switch 10-3 for communication, the positive parallel operation switch 10-4 and the negative parallel operation switch 10-5 are set to be opened, and then loads are respectively connected to the outputs of the two power supply channels 4.
The parallel operation method of the double-channel power supply provided by the invention can judge the master machine and the slave machine by setting the line switch and the current sensor to acquire data, is more reliable and more convenient compared with a software mode for judging the master machine and the slave machine, and the parallel operation is carried out by using the method provided by the invention.
EXAMPLE five
In this embodiment, the dual-channel power system shown in fig. 4 is subjected to parallel operation, wherein two power channels are respectively a power channel a4 and a power channel B4, one end of the positive parallel-operation line 10-2-1 is connected to the front end of the current sensor a4-4 on the positive output line a4-2 of the power channel a4, the other end is connected to the rear end of the current sensor B4-4 on the positive output line B4-2 of the power channel B4, one end of the negative parallel-operation line 10-2 is connected to the negative output line a4-3 of the power channel 4A, and the other end is connected to the negative output line B4-3 of the power channel B4.
Step 1, a main power supply 1 is turned on, and the dual-channel power supply system is electrified;
step 2, setting a parallel operation switch 10-3 for communication, a positive parallel operation switch 10-4 and a negative parallel operation switch 10-5 to be closed;
step 3, a first line switch A4-5, a second line switch A4-6, a third line switch A4-7 and a fourth line switch A4-8 of a power channel A4 are set to be closed, a first line switch B4-5, a second line switch B4-6, a third line switch B4-7 and a fourth line switch B4-8 of a power channel B4 are set to be opened, and the current value A1 of a current sensor in the power channel A4 is collected to be 50A;
step 4, a first line switch B4-5, a second line switch B4-6, a third line switch B4-7 and a fourth line switch B4-8 of a set power channel B4 are closed, a first line switch A4-5, a second line switch A4-6, a third line switch A4-7 and a fourth line switch A4-8 of a set power channel A4 are opened, and the current value A2 of a current sensor in the power channel B4 is collected to be 30A;
step 5, if the current value A1 acquired in the step 3 is larger than the current value A2 acquired in the step 4, the power supply channel A4 is the master, and the power supply channel B4 is the slave;
step 6, closing a first line switch A4-5, a second line switch A4-6, a third line switch A4-7 and a fourth line switch A4-8 which are set as a power channel 4A, closing a first line switch B4-5 and a third line switch B4-7 which are set as a power channel B4, and opening a second line switch B4-6 and a fourth line switch B4-8 which are set as a power channel B4;
step 7, determining the output current value of the power channel B4;
in this embodiment, the current value required by the load is 100A, the slave outputs 20A, then the master output current is 100A-20A-80A, in actual operation, because of problems such as sampling precision, algorithm, interference and the like, the output of each channel power supply has a non-integer condition, one of the slaves requires to output 20A current, when taking part in operation, the actual output has a deviation, for example, 20.1A, because the total current 100A is constant, the master output is necessarily 100-20.1-79.9, here, it is not necessary to correct whether the master and slave output values have a deviation, as long as the parallel operation total current 100A is accurate, the requirement is met
8, subtracting the output current value of the power channel B4 from the current value required by the load to obtain the output current value of the power channel A4;
and 9, the control host sets the output current value of the power channel A4 to the power channel A4, and sets the output current value of the power channel B4 to the power channel B4 to complete parallel operation.
EXAMPLE six
In this embodiment, the parallel operation is performed on the dual-channel power supply shown in fig. 5, where two power supply channels are respectively a power supply channel a4 and a power supply channel B4, one end of the positive parallel line 10-2-1 is connected to the rear end of the current sensor a4-4 on the positive output line a4-2 of the power supply channel a4, the other end is connected to the front end of the current sensor B4-4 on the positive output line B4-2 of the power supply channel B4, one end of the negative parallel line 10-2 is connected to the negative output line a4-3 of the power supply channel 4A, and the other end is connected to the negative output line B4-3 of the power supply channel B4.
Step 1, a main power supply 1 is turned on, and the dual-channel power supply system is electrified;
step 2, setting a parallel operation switch 10-3 for communication, a positive parallel operation switch 10-4 and a negative parallel operation switch 10-5 to be closed;
step 3, a first line switch A4-5, a second line switch A4-6, a third line switch A4-7 and a fourth line switch A4-8 of a power channel A4 are set to be closed, a first line switch B4-5, a second line switch B4-6, a third line switch B4-7 and a fourth line switch B4-8 of a power channel B4 are set to be opened, and the current value A1 of a current sensor in the power channel A4 is collected to be 30A;
step 4, a first line switch B4-5, a second line switch B4-6, a third line switch B4-7 and a fourth line switch B4-8 of a set power channel B4 are closed, a first line switch A4-5, a second line switch A4-6, a third line switch A4-7 and a fourth line switch A4-8 of a set power channel A4 are opened, and the current value A2 of a current sensor in the power channel B4 is collected to be 50A;
step 5, if the current value A1 acquired in the step 3 is smaller than the current value A2 acquired in the step 4, the power supply channel A4 is a slave, and the power supply channel B4 is a master;
step 6, closing a first line switch B4-5, a second line switch B4-6, a third line switch B4-7 and a fourth line switch B4-8 which are set as a power channel B4, closing a first line switch A4-5 and a third line switch A4-7 which are set as a power channel A4, and opening a second line switch A4-6 and a fourth line switch A4-8 which are set as a power channel A4;
step 7, determining the output current value of the power channel A4;
8, subtracting the output current value of the power channel A4 from the current value required by the load to obtain the output current value of the power channel B4;
and 9, the control host sets the output current value of the power channel B4 to the power channel B4, sets the output current value of the power channel A4 to the power channel A4, and then completes parallel operation.

Claims (2)

1. A dual-channel power supply system is characterized in that a parallel operation total current or two output currents are supplied to a load according to a parallel operation mode or a non-parallel operation mode selected by a user, and the dual-channel power supply system comprises a power supply module, a control system, two power supply channels (4), a parallel operation selection module (10) and an output module;
the power supply module is used for providing input current;
the control system is used for calculating the control current of each power channel (4) according to the user selection, the current required by the load and the input current;
each power supply channel (4) is used for processing the input current according to the control current to obtain an output sub-current of each power supply channel (4);
the parallel operation selection module (10) is used for superposing the output sub-current of each power supply channel (4) according to the selection of a user to obtain the parallel operation total current;
or the output sub-current of each power channel (4) is respectively output according to the selection of a user to obtain two output currents;
the output module is used for supplying the parallel machine total current to one load or respectively supplying the two output currents to two loads;
the parallel operation selection module (10) comprises a parallel operation power line (10-2) and a parallel operation switch arranged on the parallel operation power line (10-2), wherein the parallel operation power line (10-2) is connected with the two power channels (4), and the parallel operation switch is used for switching on or switching off the connection of the two power channels (4) according to the selection of a user so as to superpose or independently output the output sub-currents of the two power channels (4);
the parallel operation selection module (10) further comprises a communication parallel operation line (10-1) and a communication parallel operation switch (10-3) connected to the communication parallel operation line (10-1), the communication parallel operation line (10-1) is used for being connected with the control system, the communication parallel operation switch (10-3) is used for switching on or switching off the connection between the parallel operation selection module (10) and the control system according to the selection of a user, and when the user selects two power channels (4) to be in a parallel operation mode, the communication parallel operation switch (10-3) is switched on; when a user selects two power channels (4) to be in a non-parallel mode, the communication parallel switch (10-3) is turned off;
the control system comprises a control host (8) and two control modules (5);
the control host (8) is used for judging whether the two power channels (4) are in a parallel operation mode or a non-parallel operation mode according to the connection or the disconnection of the communication parallel operation switch (10-3);
the control module (5) is used for calculating the control current of each power channel (4) during parallel operation or calculating the control current of each power channel (4) during independent operation according to the current required by the load and the input current according to whether the two power channels (4) are in a parallel operation mode or a non-parallel operation mode;
the power supply channel (4) comprises a power supply conversion module (4-1), a positive electrode output line (4-2) and a negative electrode output line (4-3), and the positive electrode output line (4-2) is also connected with a Hall current sensor (4-4);
the power supply conversion module (4-1) is used for converting the input current into an output sub-current according to the control current;
the positive electrode output line (4-2) and the negative electrode output line (4-3) are used for transmitting output sub-current to the output module;
the Hall current sensor (4-4) is used for measuring the magnitude of the output sub-current in the power supply channel (4);
the power supply channel (4) further comprises a plurality of line switches for determining a master machine or a slave machine during parallel operation, wherein the line switches comprise a first line switch (4-5) and a second line switch (4-6) arranged on the positive output line (4-2), and a third line switch (4-7) and a fourth line switch (4-8) arranged on the negative output line (4-3);
the first line switch (4-5) and the third line switch (4-7) are used for connecting or disconnecting the power conversion module (4-1) and the parallel machine power line (10-2), and the second line switch (4-6) and the fourth line switch (4-8) are used for connecting or disconnecting the parallel machine selection module and the output module.
2. A parallel operation method of a dual channel power supply system, for performing the parallel operation of the dual channel power supply system of claim 1, the method is performed according to the following steps:
step 1, selecting the dual-channel power supply system to work in a parallel mode;
step 2, respectively obtaining current values A1 and A2 of the two power channels (4) when the two power channels (4) are independently disconnected with the load;
step 3, if the A1 is larger than the A2, the power channel (4) with the current value A1 is taken as a master, the other power channel (4) is taken as a slave, otherwise, the power channel (4) with the current value A2 is taken as the master, and the other power channel (4) is taken as a slave;
step 4, determining the output current value of the power channel (4) of the slave;
step 5, subtracting the output current value of the power channel (4) of the slave from the current value required by the load to obtain the output current value of the power channel (4) of the master, and finishing the parallel operation;
when the power channel output current value of the slave is determined in the step 4, firstly, the proportion value of the output current of the power channel (4) of the slave and the current required by the load is determined, and the power channel output current value of the slave is determined according to the proportion value of the power channel (4) of the slave.
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