CN109412392B - Multichannel power supply parallel operation system and method - Google Patents
Multichannel power supply parallel operation system and method Download PDFInfo
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- CN109412392B CN109412392B CN201811366181.4A CN201811366181A CN109412392B CN 109412392 B CN109412392 B CN 109412392B CN 201811366181 A CN201811366181 A CN 201811366181A CN 109412392 B CN109412392 B CN 109412392B
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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
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
Abstract
The invention discloses a multichannel power supply parallel operation system and a multichannel power supply parallel operation method, which aim to realize the requirement of a load on large current; the multichannel power supply parallel operation system provided by the invention consists of an input power line, an output power line, a communication line, a plurality of power supply channels, an output cathode, an output anode, a current sensor and a master-slave machine determining line; the method for quickly confirming the host and the slave in the parallel operation is provided, and the parallel operation scheme is conveniently realized.
Description
Technical Field
The invention relates to a power supply parallel operation method and a power supply parallel operation system, in particular to a multi-channel power supply parallel operation system and a multi-channel power supply parallel operation method.
Background
When power is supplied to a load, the load sometimes exceeds the current output by a single power supply, and a double-channel parallel operation method can be considered to meet the current requirement of the load, but in the prior art, due to the fact that power mismatch exists between double-channel power supplies, the power supply needs to be disassembled to confirm a host and a slave in the double-channel power supplies during parallel operation, steps are complex during actual operation, workload is large during parallel operation, and synchronization time is long; or in the prior art, the synchronization time is shortened by adopting a mode of predicting the host machine parameters by the slave machine, but the method has large calculation amount and is not suitable for the requirement of on-site real-time parallel operation.
The prior art provides a UPS power parallel operation system, which provides two channels of power parallel operation to meet the power supply requirement of an external load. However, how to parallel, the determination of the master power supply and the slave power supply during parallel operation are not described in detail, and how to distribute the output of each channel current after parallel operation is also not described.
Therefore, most parallel operation systems and parallel operation methods in the prior art have the problems that the parallel operation efficiency is not high due to the fact that the determining process of the master and the slave is complex, and the voltage precision obtained after parallel operation is not high due to the fact that the output current of each power supply is not considered during parallel operation.
Disclosure of Invention
The invention aims to provide a multi-channel power supply parallel operation system and a multi-channel power supply parallel operation method, which are used for solving the problems of low parallel operation efficiency and low voltage obtaining precision caused by the complex determining process of a master machine and a slave machine in the prior art.
In order to realize the task, the invention adopts the following technical scheme:
a multi-channel power supply parallel operation system is used for providing parallel operation current for a load and comprises a main power supply, an input power line, an output power line, a plurality of power supply channels, an output anode and an output cathode, wherein the output anode and the output cathode are respectively connected with the anode and the cathode of the load;
one end of the input power line is connected with a main power supply, the other end of the input power line is respectively connected with each power supply channel, one end of the communication line is connected with the control host, and the other end of the communication line is respectively connected with each power supply channel;
each power supply channel comprises a positive electrode output and a negative electrode output, the positive electrode output of each power supply channel is connected in parallel with the first current sensor through an output power line and then connected with the positive electrode of the output, and the negative electrode output of each power supply channel is connected in parallel with the negative electrode of the output through an output power line and then connected with the negative electrode of the output;
one end of the master-slave machine determination line is connected with any one of the power supply channels, and the other end of the master-slave machine determination line is connected with the first current sensor;
the power of each power channel is the same.
Furthermore, the power channel comprises a control module, a power conversion circuit module and a power output module;
the input power line is connected with the power output module through the power conversion circuit module, the communication line is respectively connected with the power conversion circuit module and the control module, and the power conversion circuit module is also connected with the power output module through the communication line;
the master-slave machine determination line is connected with the power conversion circuit module.
Further, the power output module comprises a second current sensor, a first switch and a second switch, wherein the second current sensor is connected in series with the first switch and then connected in parallel with the second switch to form the positive output and the negative output of the power output module.
Furthermore, the power conversion circuit module comprises a power circuit and an analog-to-digital conversion circuit, wherein the analog-to-digital conversion circuit comprises a signal processing circuit and an analog-to-digital sampling circuit connected with the signal processing circuit;
the input power line is connected with the power output module through the power circuit;
the signal processing circuit is connected with the second current sensor through the communication line, and is also connected with the first current sensor through the master-slave machine determination line; the analog-digital sampling circuit is connected with the control module through the communication line.
A multi-channel power supply parallel operation method for performing parallel operation on the multi-channel power supply parallel operation system, the method comprising:
setting the first switch of each power channel to be in an open state, and setting the second switch to be in a closed state;
reading current data by the control host, setting the power supply channel with the current data as a host, and setting all the rest power supply channels as slaves;
setting first switches in power supply channels of all slaves to be in a closed state, and setting second switches to be in an open state;
determining the output current value of a power channel of each slave;
subtracting the sum of the output current values of the power channels of all the slaves from the current value required by the load to obtain the output current value of the power channel of the master;
and controlling the host to set the output current value of the power supply channel of the host to the power supply channel of the host, and finishing parallel operation after setting the output current value of the power supply channel of each slave to the power supply channel of each slave.
Further, when the power channel output current value of each slave is determined in the step, a ratio of the power channel output current of each slave to the current required by the load is determined, and the power channel output current value of each slave is determined according to the ratio of the power channel of each slave.
Compared with the prior art, the invention has the following technical characteristics:
1. according to the multi-channel power supply parallel operation system and method provided by the invention, when equipment leaves a factory, which channel is connected to the detection line is fixed, the host and the slave can be known only by controlling the host to acquire the data of the first current sensor acquired by each power supply channel, and the host and the slave are arranged optionally and flexibly.
2. In the parallel operation process, compared with a method that a plurality of power supply channels detect output current through respective current sensors and then sum, the method provided by the invention is easier in algorithm implementation, high in operation speed, capable of saving operation resources of a processor and good in realizability;
3. in the parallel operation process, under the condition of setting certain output current, the output accuracy change of a single host and other slaves is not considered, the final output current is simple parallel operation compared with two channel power supplies, the output accuracy of each channel power supply is determined by the current sensor of the channel power supply, and the system and the method provided by the invention can be determined by only one current sensor, so the accuracy is improved, and the accuracy of the method is higher than that of the method for determining the final output current by the sum of the currents of a plurality of channels.
Drawings
FIG. 1 is a schematic structural diagram of a multi-channel power supply parallel operation system provided by the present invention;
fig. 2 is a schematic structural diagram of a multi-channel power supply parallel operation system provided in an embodiment of the invention;
FIG. 3 is a schematic diagram of a dual channel power supply parallel operation system according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an internal structure of a power output module according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an internal structure of a power channel according to an embodiment of the present invention;
fig. 6 is a schematic diagram of internal structures of two power modules in a dual-channel power supply parallel operation system according to an embodiment of the present invention.
The reference numbers in the figures represent: 1-power channel, 2-output positive electrode, 3-output negative electrode, 4-input power line, 5-communication line, 6-control host, 7-master-slave machine determination line, 8-first current sensor, 9-output power line, 11-control module, 12-power conversion circuit module, 13-power output module, 121-power circuit, 122-analog-digital conversion circuit, 1221-signal processing circuit, 1222-digital-analog sampling circuit, 131-second current sensor, 132-first switch, 133-second switch, 134-positive electrode output, 135-negative electrode output, (A-1) -first power channel, (B-1) -second power channel, (A-11) -first power channel control module, (a-12) -first power channel power conversion circuit module, (a-13) -first power channel power output module, (a-131) -first power channel second current sensor, (a-132) -first power channel first switch, (a-133) -first power channel second switch, (B-11) -second power channel control module, (B-12) -second power channel power conversion circuit module, (B-13) -second power channel power output module, (B-131) -second power channel second current sensor, (B-132) -second power channel first switch, (B-133) -second power channel second 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.
As shown in fig. 1, the power parallel operation system provided by the present invention includes a power supply module, a current conversion module, a current output module, a current control module, and a master/slave determination line 7, wherein the power supply module, the current conversion module, and the current output module are sequentially connected, the current control module is connected to the current conversion module, one end of the master/slave determination line is connected to the current output module, and the other end is connected to the current conversion module;
the power supply module is used for providing current for the whole parallel operation system, and comprises a main power supply and an input power line 4 connected with the main power supply, wherein the main power supply is used for providing an input power supply for the power parallel operation system, and the input power line 4 is used for transmitting the current output by the main power supply to the current conversion module;
the current output module is connected with the current conversion module, the current output module is used for providing total current for the load, wherein the current output module comprises an output anode 2, an output cathode 3, an output power line 9 and a first current sensor 8, wherein the output anode 2 and the output cathode 3 are used for being connected with the anode and the cathode of the load respectively to provide total current for the load, the output power line 9 is used for being connected with the current conversion module, and the first current sensor 8 is connected with the output anode and used for measuring the output current value of the current output module.
One end of the master-slave machine determination line 7 is connected with the current output module, and the other end of the master-slave machine determination line is connected with the current conversion module and used for sending the output current value of the current output module acquired by the first current sensor 8 in the current output module to the current conversion module.
The current control module is connected with the current conversion module and used for controlling the magnitude of the output current value of the current conversion module and adjusting the output current value of the current conversion module in time according to the magnitude of the output current value of the current output module; the current control module comprises a control host 6 and a communication line 5, wherein the control host 6 is connected with the current conversion module through the communication line 5 and is used for controlling the output current value of the current conversion module and obtaining the current output measured by a first current sensor 8 converted by the current conversion module to control the output current value of the current conversion module;
one end of the current conversion module is connected with the power supply module and the current control module, the other end of the current conversion module is connected with the output module, the current conversion module is used for converting the current provided by the power supply module into a plurality of output currents and then supplying the output currents to the output module, and is also used for converting the output current value measured by the first current sensor 8, wherein the current conversion module comprises a plurality of power channels 1, each power channel 1 is used for providing one output current for the output module, and the output currents of the plurality of current channels 1 are superposed to provide the total current for the output module;
the power channel 1 comprises a control module 11, a power conversion circuit module 12 and a power output module 13, wherein the control module 11 is connected with the current control module and used for receiving an instruction from the control host 6, and the control module 11 is also connected with the current output module and used for setting the output current of the power channel 1 according to the instruction of the control host 6;
the power conversion circuit module 12 is connected with the power output module 13 and is used for converting the input current of a single power channel into the output current; the power conversion module 12 is also connected with the first current sensor 8 through the master-slave determination line 7, and is used for converting the output current value measured by the first current sensor 8 into a form which can be received by the current control module; the power conversion module comprises a power circuit 121 for converting input current into output current, one end of the power circuit is connected with the power supply module, the other end of the power circuit is connected with the current output module, the power conversion module further comprises an analog-to-digital conversion circuit 122 for converting an output current value measured by the first current sensor 8 into a form which can be received by the current control module, the analog-to-digital conversion circuit 122 comprises digital-to-analog sampling circuits 1222 which are connected with each other through signal processing circuits 1221, and the signal processing circuits 1221 are further connected with the first current sensor 8 through a master-slave determination line 7 and are used for converting signals acquired by the first current sensor 8 into analog signals which can be converted by the analog-to-digital sampling circuits 1222; the analog-to-digital sampling circuit 1222 is connected to the control module 11 through the communication line 5, and is configured to convert the analog signal into a digital signal, and report the digital signal to the control host through the communication line 5, so as to read the signal acquired by the first current sensor 8 by the control host.
The power output module 13 is connected with the current output module and is used for outputting current from a single power channel. The power output module 13 comprises a first switch 132, a second current sensor 131 and a second switch 133, wherein the first switch 132 and the second current sensor 131 are connected in series and then connected with the current output module, the second switch 133 is directly connected with the current output module, and the first switch 132 is used for switching on or switching off a measurement path of the second current sensor 131; the second current sensor 131 is used for measuring the output current value of the power channel 1 where the second current sensor is located; the second switch 133 is used to short-circuit the current path in which the second current sensor 131 is located.
The following are specific examples provided by the inventors to further explain the technical solutions of the present invention.
Example one
As shown in fig. 2, the embodiment discloses a multi-channel power supply parallel operation system, which is used for providing parallel operation current for a load, and includes a main power supply, an input power line 4, an output power line 9, a plurality of power channels 1, an output anode 2, and an output cathode 3, where the output anode 2 and the output cathode 3 are respectively connected to the anode and the cathode of the load, and further includes a communication line 5, a control host 6, a master-slave determination line 7, and a first current sensor 8;
one end of the input power line 4 is connected with a main power supply, the other end of the input power line 4 is respectively connected with each power supply channel 1, one end of the communication line 5 is connected with the control host 6, and the other end of the communication line 5 is respectively connected with each power supply channel 1;
each power channel 1 comprises a positive electrode output 134 and a negative electrode output 135, the positive electrode output 134 of each power channel 1 is connected in parallel with each other through an output power line 9, then is connected in series with the first current sensor 8, and then is connected with the output positive electrode 2, and the negative electrode output 135 of each power channel 1 is connected in parallel with each other through an output power line 9, and then is connected with the output negative electrode 3;
one end of the master-slave machine determination line 7 is connected with any one power channel 1 of the plurality of power channels 1, and the other end of the master-slave machine determination line is connected with the first current sensor 8;
the power of each of the power channels 1 is the same.
In the invention, the multi-channel power supply can be a double-channel power supply, a three-channel power supply or a plurality of power supply channels with three channels and more.
As shown in FIG. 3, in the present embodiment, which provides a dual channel power supply parallel operation system, for example, input power line 5 provides power to the inputs of first power channel A-1 and second power channel B-1. One end of the communication line 5 is connected with the control host, and the other end is connected with the first power channel A-1 and the second power channel B-1. The internal components of the first power channel A-1 and the second power channel B-1 are completely the same, and the power supply powers are also completely the same.
The positive output of the first power channel A-1 is connected with the positive output of the second power channel B-1 in parallel and then is connected with the output positive electrode 2 through the current sensor 8, and the negative output of the first power channel A-1 is connected with the negative output of the second power channel B-1 in parallel and then is connected with the output negative electrode 3;
one end of the master-slave machine determination line 7 is connected with the first power supply channel A-1 or the second power supply channel B-1, and the other end is connected with the current sensor 8.
Optionally, the power channel 1 includes a control module 11, a power conversion circuit module 12, and a power output module 13;
the input power line 4 is connected with the power output module 13 through the power conversion circuit module 12, the communication line 5 is respectively connected with the power conversion circuit module 12 and the control module 11, and the power conversion circuit module 12 is further connected with the power output module 13 through the communication line 5;
the master-slave determination line 7 is connected to the power conversion circuit module 12.
As shown in fig. 3, the present embodiment includes two power channels, which are a first power channel a-1 and a second power channel B-1, respectively, where the first power channel a-1 includes a first control module a-11, a first power conversion circuit module a-12, and a first power output module a-13;
the second power channel B-1 comprises a second control module B-11, a second power conversion circuit module B-12 and a second power output module B-13;
the input power line 4 is connected with the first power output module A-13 through the first power conversion circuit module A-12, the communication line 5 is respectively connected with the first control module A-11 and the first power conversion circuit module A-12, and the communication line 5 also connects the first power conversion module A-12 with the first output module A-13.
The input power line 4 is connected with the second power output module B-13 through the second power conversion circuit module B-12, the communication line 5 is respectively connected with the second control module B-11 and the second power conversion circuit module B-12, and the communication line 5 also connects the second power conversion module B-12 with the second output module B-13.
As shown in fig. 2, the control module 11 is composed of a processor, the control module 11 is connected to the control host 6 through the communication line 5, receives a command from the control host 6 to set an output parameter of the power output module 13, and simultaneously, the control module 11 is connected to the power conversion circuit module 12 through the communication line 5, and reports a current value detected by the power conversion circuit module 12 to the control host 6 through the communication line 5.
The master-slave machine determination line 7 is connected to the first power conversion module 12, the master-slave machine determination line 7 is connected before the device leaves a factory, and when the device leaves the factory, the position of the master-slave machine determination line 7 cannot be adjusted without disassembling the device.
Optionally, the power output module 13 includes a second current sensor 131, a first switch 132, and a second switch 133, where the second current sensor 131 is connected in series with the first switch 132 and then connected in parallel with the second switch 133 to form the positive output 134 and the negative output 135 of the power output module 13.
In the present embodiment, as shown in fig. 4, the power output modules 13 of each power channel 1 are completely the same in composition. In the present embodiment, the first switch 132 and the second switch 133 are both power switches, and may be formed by power switches such as a relay and a contactor.
The second current sensor 131 is used to measure the output current of the power channel itself, and the first switch 132 connected in series with the second current sensor 131 can turn on or off the measurement path of the second current sensor 131. In actual operation, when the second switch 133 is closed, no current flows through the circuit formed by the first switch 132 connected in series with the second current sensor 131, and when the second switch 133 is open, the circuit is controlled by the first switch 132.
Optionally, the power conversion circuit module 12 includes a power circuit 121 and an analog-to-digital conversion circuit 122, where the analog-to-digital conversion circuit 122 includes a signal processing circuit 1221 and an analog-to-digital sampling circuit 1222 connected to the signal processing circuit 1221;
the input power line 4 is connected with the power output module 13 through the power circuit 121;
the signal processing circuit 1221 is connected to the second current sensor 131 through the communication line 5, and the signal processing circuit 1221 is further connected to the first current sensor 8 through the master-slave determination line 7; the analog-to-digital sampling circuit 1222 is connected to the control module 11 through the communication line 5.
In this embodiment, as shown in fig. 5, there is only one master/slave determination line 7 for detecting which power channel is the master and which power channel is the slave, one end of the master/slave determination line 7 is connected to the current output end of the first current sensor 8, the other end of the master/slave determination line 7 is connected to the signal processing circuit 1221 of the power channel 1, the analog current signal processed by the signal processing circuit 1221 enters the analog-to-digital sampling circuit 1222 to convert the analog signal into a digital signal, and is reported to the control module 11 of the power channel a through the communication line 5, and then the control module 11 of the power channel a reports the measured output current to the control host 6.
Therefore, the principle of determining the host and the slave by using the parallel operation system provided by the invention is as follows (taking a dual-channel power supply as an example):
when the control host 6 receives the current data, the control host 6 similarly receives the current data sent by the control module a-11 or B-11 of the power channel a or the power channel B, and if the current data is sent by the control module a-11 of the power channel a, it indicates that the master/slave determination line 7 is connected to the power channel a side, and then the upper computer marks the power channel a as the master after receiving the output current data of the power channel a side, and when the power channel B detects the output total current, the control module B-11 of the power channel B cannot report the data of the output first current sensor 8 to the control host, and marks the power channel B as the slave because the master/slave determination line 7 is not connected; the same is true when power channel B is the host.
After the master machine and the slave machine are arranged, the current data displayed by the master machine is the data of the first current sensor 8, and the data is used for participating in the control of power output to ensure the output precision, and the second current sensor 131 of the own channel power supply of the master machine does not collect the current data of the channel power supply any more. The control master 6 sets a certain proportion, for example, half of the slave output current to output the current data of the first current sensor 8 (namely, the current required by the load side) according to the current data of the master, and at this time, the slave current data only performs current display of the current power supply of the channel and does not participate in the precision control of the current power supply of the channel. For the master, the control master 6 does not directly set the slave power supply by directly setting a certain ratio, for example, half, of the current value output from the first current sensor 8 as a set value, but sets the difference between the output value of the first current sensor 8 and the current display value of the master-side second current sensor 131 to the power supply channel in which the master is located. The power channel of the host gets this data, i.e. the parallel machine current, and at the same time it also participates in the accuracy control of the total output current. Therefore compare with traditional simple parallel operation technique, this scheme only has the current sensor of a total output to gather current data and show and participate in the output current of precision control and when parallel operation total current is greater than every single channel power supply, and the simple parallel operation scheme of tradition, two hall current sensor display data and participate in the precision control of two way channel power supplies at least, under the same condition of hall current sensor specification, this scheme precision will be higher than traditional parallel operation mode.
Example two
The embodiment discloses a dual-channel power supply parallel operation method, which is used for performing parallel operation on the dual-channel power supply parallel operation system in the first embodiment, and the method comprises the following steps:
optionally, a ratio value of the output current of the power channel 1 of each slave to the current required by the load is determined, and an output current value of the power channel 1 of each slave is determined according to the ratio value of the power channel 1 of each slave;
under the condition that the total output parallel operation current is constant, the output currents of the two power supply channels can be determined by a user according to percentages, such as 40% of the total output current of the channel A and 60% of the total output current of the channel B, and the user does not need to limit the invention.
in this step, for example, the current value required by the load is 100A, one slave output 20A and one slave output 40A, then the master output current is 100A-20A-40A, in actual operation, because of problems of 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 the slave takes part in operation, the actual output has a deviation, such as 20.1A, similarly, the other slave also has a similar condition, such as 39.8A, because the total current 100A is constant, the master output is necessarily 100-20.1-39.8-40.1, and here, it is not necessary to correct whether the master and slave output values have a deviation, and the requirement is satisfied as long as the output total current 100A is accurate.
And 6, setting the output current value of the power channel 1 of the master machine to the power channel 1 of the master machine, and finishing parallel operation after setting the output current value of the power channel of each slave machine to the power channel 1 of each slave machine.
According to the channel power supply parallel operation method, the reading of the current value of the first current sensor 8 is output through the matching arrangement of the master-slave machine determination line 7, and the master machine and the slave machine during parallel operation can be determined rapidly. After the current value which should be output by the slave is set, the current output by the master is naturally determined due to the fact that the total output current value is constant, namely the difference value of the total output current value and the current value output by the slave, and under the condition that the total output current value is constant, the current value of the master is determined without participating in the precision control of the channel power supply, so that the process of the power supply operation of the master is omitted, the algorithm of software is simplified, and the parallel operation current setting of the master and the slave is very simple. In terms of precision, after parallel operation, the output total current is determined by only one first current sensor 8, compared with two independent current channel power supplies and simple parallel operation, the total output current precision is determined by the current sensors of the two channel power supplies, and the parallel operation output precision of the parallel operation mode provided by the invention is higher.
EXAMPLE III
In this embodiment, a dual-channel power source parallel operation is taken as an example to describe the parallel operation method provided by the present invention.
In the present embodiment, as shown in fig. 3 and 6, the two power channels 1 are a first power channel a and a second power channel B, respectively, the first power channel a includes the second current sensor a-131 of the first power channel a, the first switch a-132 of the first power channel a, and the second switch a-133 of the first power channel a, and the second power channel B includes the second current sensor B-131 of the second power channel B, the first switch B-132 of the second power channel B, and the second switch B-133 of the second power channel B.
in this step, if the master-slave determination line 7 is connected to the first power channel a, the control master 6 can read the current data sent by the first control module a-11 of the first power channel a, that is, the master is the first current channel a, and the slave is the second current channel B.
On the contrary, if the master-slave determination line is connected to the second power channel B, the master is the second current channel B and the slave is the first current channel a according to the current data read by the control master 6.
Therefore, the parallel operation method provided by the invention can quickly determine the master and the slave during parallel operation by reading the current degree of the first current sensor 8.
in this step, the first switch B-132 in the second power channel B is set to a closed state and the second switch B-133 is set to an open state.
in this step, the output current value of the second power channel B is 50A at a ratio of 50%.
in this step, the current value required by the load is 100A, the output current value of the second power channel B of the slave is 50A, and the output current value of the first power channel a of the master is 50A.
And 6, controlling the host 6 to set the output current value of the power channel 1 of the host to the power channel 1 of the host, and finishing parallel operation after setting the output current value of the power channel of each slave to the power channel 1 of each slave.
In this step, after the control host 6 sets the output current value of the first power channel a to 50A and the output current value of the second power channel B to 50A, the current finally output by the parallel operation system is 100A, and the parallel operation is completed.
Claims (6)
1. A multi-channel power supply parallel operation system is used for providing parallel operation current for a load and comprises a main power supply, an input power line (4), an output power line (9), a plurality of power supply channels (1), an output anode (2) and an output cathode (3), wherein the output anode (2) and the output cathode (3) are respectively connected with the anode and the cathode of the load, and the multi-channel power supply parallel operation system is characterized by further comprising a communication line (5), a control host (6), a master-slave machine determining line (7) and a first current sensor (8);
one end of the input power line (4) is connected with a main power supply, the other end of the input power line (4) is respectively connected with each power supply channel (1), one end of the communication line (5) is connected with the control host (6), and the other end of the communication line (5) is respectively connected with each power supply channel (1);
each power channel (1) comprises a positive electrode output (134) and a negative electrode output (135), the positive electrode output (134) of each power channel (1) is connected in parallel with each other through an output power line (9), then is connected in series with the first current sensor (8), then is connected with the output positive electrode (2), and the negative electrode output (135) of each power channel (1) is connected in parallel with the output negative electrode (3) through the output power line (9);
one end of the master-slave machine determination line (7) is connected with any one power supply channel (1) of the plurality of power supply channels (1), and the other end of the master-slave machine determination line is connected with the first current sensor (8);
the power of each power channel (1) is the same.
2. The multi-channel power supply parallel operation system of claim 1, wherein the power supply channel (1) comprises a control module (11), a power conversion circuit module (12) and a power supply output module (13);
the input power line (4) is connected with the power output module (13) through the power conversion circuit module (12), the communication line (5) is used for respectively connecting the power conversion circuit module (12) and the control module (11) with the control host (6), and the power conversion circuit module (12) is also connected with the power output module (13) through the communication line (5);
the master-slave machine determination line (7) is connected with the power conversion circuit module (12).
3. The multi-channel power supply parallel operation system as claimed in claim 2, wherein the power output module (13) comprises a second current sensor (131), a first switch (132) and a second switch (133), the second current sensor (131) is connected in series with the first switch (132) and then connected in parallel with the second switch (133) to form the positive output (134) and the negative output (135) of the power output module (13).
4. The multi-channel power supply parallel operation system of claim 3, wherein the power conversion circuit module (12) comprises a power circuit (121) and an analog-to-digital conversion circuit (122), and the analog-to-digital conversion circuit (122) comprises a signal processing circuit (1221) and an analog-to-digital sampling circuit (1222) connected with the signal processing circuit (1221);
the input power line (4) is connected with the power output module (13) through the power circuit (121);
the signal processing circuit (1221) is connected with the second current sensor (131) through the communication line (5), and the signal processing circuit (1221) is also connected with the first current sensor (8) through the master-slave determination line (7); the analog-digital sampling circuit (1222) is connected with the control module (11) through the communication line (5).
5. A multi-channel power supply parallel operation method, which is used for performing parallel operation on the multi-channel power supply parallel operation system of any one of claims 3-4, and comprises the following steps:
step 1, setting a first switch (132) of each power channel (1) to be in an open state, and setting a second switch (133) to be in a closed state;
step 2, the control host (6) reads current data, sets the power supply channel (1) with the current data as a host, and sets all the rest power supply channels (1) as slaves;
step 3, setting the first switches (132) in the power channels (1) of all the slaves to be in a closed state, and setting the second switches (133) to be in an open state;
step 4, determining the output current value of the power channel (1) of each slave;
step 5, subtracting the sum of the output current values of the power channels (1) of all the slaves from the current value required by the load to obtain the output current value of the power channel (1) of the master;
and 6, controlling the host (6) to set the output current value of the power channel (1) of the host to the power channel (1) of the host, and finishing parallel operation after setting the output current value of the power channel of each slave to the power channel (1) of each slave.
6. The multi-channel power supply parallel operation method according to claim 5, wherein when determining the output current value of the power supply channel (1) of each slave in step 4, a ratio of the output current of the power supply channel (1) of each slave to the current required by the load is determined first, and the output current value of the power supply channel (1) of each slave is determined according to the ratio of the power supply channel (1) of each slave.
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