CN111884493B - Multi-power-supply master-slave multi-machine communication method and multi-power-supply system - Google Patents

Multi-power-supply master-slave multi-machine communication method and multi-power-supply system Download PDF

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CN111884493B
CN111884493B CN202010820356.5A CN202010820356A CN111884493B CN 111884493 B CN111884493 B CN 111884493B CN 202010820356 A CN202010820356 A CN 202010820356A CN 111884493 B CN111884493 B CN 111884493B
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power supply
slave
master
pwm signal
power supplies
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CN111884493A (en
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安俊洁
刘凯
朱朝华
杨碧磊
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Sichuan Injet Electric 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M1/36—Means for starting or stopping converters
    • 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 relates to the technical field of high-power high-frequency switching power supplies, in particular to a master-slave multi-motor communication method with multiple power supplies and a multi-power-supply system. The invention combines and modulates the starting signal, the synchronous signal and the given signal transmitted by the master power supply to the slave power supply into a PWM signal, and the slave power supply obtains various signals by analyzing various characteristics of the PWM signal after receiving the PWM signal, thereby realizing control. The invention greatly simplifies the number of signal lines and solves the problems of more signal lines, complex lines and easy interference in the prior art.

Description

Multi-power-supply master-slave multi-machine communication method and multi-power-supply system
Technical Field
The invention relates to the technical field of high-power high-frequency switching power supplies, in particular to a master-slave multi-motor communication method with multiple power supplies and a multi-power-supply system.
Background
In the application of a high-power high-frequency switching power supply, in order to improve power redundancy, system reliability and maintainability, a plurality of low-power supply modules are generally used for series-parallel connection work, and the output capacity of the system is improved. And the plurality of power supply modules are connected in series or in parallel to work, and the output of the plurality of power supply modules needs to be kept consistent. In the prior art, a plurality of modules are divided into a master machine and a plurality of slave machines, the master machine needs to respectively and uniformly issue a start signal, a given signal and a synchronous pulse signal of the slave machines so as to ensure that the plurality of modules operate together, and the plurality of modules output ripple wave time sequences or are in phase error under the condition that the plurality of modules output the same, so that the output ripple wave coefficient is reduced. In the prior art, the slave start signal is a switching value signal issued by a master power supply, the slave power supply is started when a switch is closed, and the slave power supply is stopped when the switch is disconnected. The slave synchronous signal is a PWM signal with fixed frequency and fixed duty ratio sent by the master power supply, and the slave power supply receives the edge signal of the PWM signal to control the output time of the trigger signal of the slave power supply module, so that multi-module synchronous triggering is achieved. The slave set signal is that the master power supply issues the set signal to the slave power supply through traditional control signals such as 0-10V, 4-20mA, 0-20mA and the like, and the linear change of the signal determines the slave power supply and the output magnitude, for example, 0-10V is linearly corresponding to 0-rated output of the slave. Therefore, transmission of a plurality of signals is required, so that a plurality of signal lines are required, and the conditions that the signal lines are complex and are easily interfered are caused.
Disclosure of Invention
The invention aims to overcome the defects that a plurality of signal lines are needed and the circuit is complex and is easy to interfere in the prior art, and provides a master-slave multi-computer communication method and system with a plurality of power supplies.
In order to achieve the above purpose, the invention provides the following technical scheme:
a master-slave multi-machine communication method with multiple power supplies comprises the following steps:
a: the master power supply outputs a PWM signal to the slave power supply;
b: the master power supply controls the on or off of the slave power supply by controlling the duty ratio of the PWM signal; taking the rising edge or the falling edge of the PWM signal as a synchronous signal of the master power supply and the slave power supply;
when the slave power supply is started, the PWM signal is also used for controlling the voltage value or the current value of the slave power supply. The invention combines and modulates the starting signal, the synchronous signal and the given signal which are transmitted to the slave power supply module by the master power supply into a PWM signal, and acquires various signals by analyzing various characteristics of the PWM signal after the slave power supply receives the PWM signal, thereby realizing control. The invention greatly simplifies the number of signal lines and solves the problems of more signal lines, complex lines and easy interference in the prior art.
As a preferred scheme of the present invention, when the duty ratio of the PWM signal is greater than a preset threshold, the slave power supply is controlled to start; when the duty ratio of the PWM signal is smaller than or equal to the preset threshold value, controlling the slave power supply to be shut down;
wherein the preset threshold is greater than 0.
In a preferred embodiment of the present invention, the slave power supply identifies a rising edge or a falling edge of the PWM signal, thereby keeping phases of the slave power supply consistent or out of phase.
As a preferable aspect of the present invention, the master power supply controls a current value or a voltage value of the slave power supply by controlling a duty ratio of the PWM signal, wherein the duty ratio is greater than the preset threshold.
In a preferred embodiment of the present invention, the PWM signal controls a current value of the slave power supply when the master power supply and the plurality of slave power supplies are connected in parallel.
As a preferred embodiment of the present invention, a calculation formula of a PWM signal duty ratio for controlling the slave power supply current value is:
Figure BDA0002634225100000031
wherein D isAt presentIs the duty ratio of the PWM signal currently controlling the current value of the slave power supply; daIs a first duty cycle (D) of the PWM signalaGreater than or equal to the preset threshold); dbIs a second duty cycle (D) of the PWM signala＜Db≤1)；IRated valueIs the rated output current of the host power supply; i isAt presentIs the current output current of the host power supply; the first duty cycle is set according to a minimum duty cycle of the PWM signal, and the second duty cycle is set according to a maximum duty cycle of the PWM signal;
the formula for demodulating the PWM signal by the slave power supply is as follows:
Figure BDA0002634225100000032
wherein D isCurrent 2Is the duty cycle of the PWM signal when the slave power supply receives demodulation; i isGIs the current given current from the power supply of the slave.
In a preferred embodiment of the present invention, the PWM signal controls a voltage value of the slave power supply when the master power supply and the plurality of slave power supplies are connected in series.
As a preferred embodiment of the present invention, a calculation formula of a duty ratio of a PWM signal for controlling the slave power supply voltage value is:
Figure BDA0002634225100000033
wherein D isAt presentIs a PWM signal controlling the value of the slave supply voltageA duty cycle; daIs a PWM signal first duty cycle; dbIs the PWM signal second duty cycle; u shapeRated valueIs the rated output voltage of the host power supply; u shapeAt presentIs the current output voltage of the host power supply;
the formula for demodulating the PWM signal by the slave power supply is as follows:
Figure BDA0002634225100000034
wherein D isCurrent 2Is the duty cycle of the PWM signal when the slave power supply receives demodulation; u shapeGIs the current given voltage of the slave power supply.
A multi-power supply system for master-slave multi-machine communication comprises a master power supply and a plurality of slave power supplies connected with the master power supply, wherein the master power supply is communicated with the slave power supplies by any one of the above multi-power master-slave multi-machine communication methods. The multi-power supply system is divided into a main machine power supply and N auxiliary machine power supplies which are independent power supplies, and all power supplies are connected in series or in parallel to provide electric energy for loads. The power supplies communicate with each other through PWM signals, the master power supply sends the PWM signals, and the slave power supply receives the PWM signals. The master power supply sends starting, synchronizing and setting signals to the slave power supply through the PWM signals. The starting is to control each power supply to start operation output at the same time, the synchronization is to control each power supply switching tube to trigger pulse at the same time or at the fixed phase-wrong time to trigger and reduce output ripples, and the given is to control the output of each power supply to be consistent and ensure the consistency of the serial connection or the parallel connection of a plurality of power supplies.
As a preferred scheme of the present invention, the master power supply is respectively connected to the slave power supplies in a communication manner, and is configured to transmit a PWM signal.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention combines and modulates the starting signal, the synchronous signal and the given signal which are transmitted to the slave power supply module by the master power supply into a PWM signal, and acquires various signals by analyzing various characteristics of the PWM signal after the slave power supply receives the PWM signal, thereby realizing control. The invention greatly simplifies the number of signal lines and solves the problems of more signal lines, complex lines and easy interference in the prior art.
2. The multi-power supply system is divided into a main machine power supply and N auxiliary machine power supplies which are independent power supplies, and all power supplies are connected in series or in parallel to provide electric energy for loads. The power supplies communicate with each other through PWM signals, the master power supply sends the PWM signals, and the slave power supply receives the PWM signals. The master power supply sends starting, synchronizing and setting signals to the slave power supply through the PWM signals. The starting is to control each power supply to start operation output at the same time, the synchronization is to control each power supply switching tube to trigger pulse at the same time or at the fixed phase-wrong time to trigger and reduce output ripples, and the given is to control the output of each power supply to be consistent and ensure the consistency of the serial connection or the parallel connection of a plurality of power supplies.
Drawings
Fig. 1 is a schematic flowchart of a master-slave multi-machine communication method with multiple power supplies according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of PWM signals of a multi-power-supply master-slave multi-machine communication method according to embodiment 1 of the present invention;
fig. 3 is a schematic diagram of a host power supply structure of a multi-power master-slave multi-computer communication method according to embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of a master-slave multi-power-supply system for multi-computer communication according to embodiment 3 of the present invention when power supplies are connected in parallel;
fig. 5 is a schematic structural diagram of a master-slave multi-power-supply system for multi-computer communication according to embodiment 3 of the present invention when power supplies are connected in series.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 1, a master-slave multi-machine communication method with multiple power supplies includes the following steps:
a: the master power supply outputs a PWM signal to the slave power supply;
b: the master power supply controls the on or off of the slave power supply by controlling the duty ratio of the PWM signal; taking the rising edge or the falling edge of the PWM signal as a synchronous signal of the master power supply and the slave power supply;
when the slave power supply is started, the PWM signal is also used for controlling the voltage value or the current value of the slave power supply.
As shown in fig. 2, the PWM signal contains rising or falling edge time, frequency, maximum and minimum duty cycle information.
Processing of the start signal:
the starting signal is used for starting and maintaining the slave power supply to work, after the master power supply receives a starting instruction, the master power supply sends a PWM signal with fixed frequency to a PWM signal bus, and when the duty ratio of the PWM signal is larger than a preset threshold value, the slave power supply is controlled to start; and when the duty ratio of the PWM signal is less than or equal to a preset threshold value, controlling the slave power supply to be shut down, and starting the slave power supply to output.
Processing the synchronous signal:
the synchronous signals are used for enabling the operation phases of the slave power supplies to be consistent, after the slave power supplies receive the PWM signals, the rising edge time or the falling edge time of the PWM signals are identified, the time is acted on a pulse generator of a driving switch tube, the initial time of driving pulses generated by the pulse generator is enabled to be consistent or in phase error with the rising edge time or the falling edge time of the PWM signals, and therefore the phases of the slave power supplies are enabled to be consistent or in phase error.
Given the processing of the signal:
the given signal is used for controlling the voltage or the current of the slave power supply, when a plurality of power supplies work in parallel, the host power supply converts the output current of the host power supply into the duty ratio of a PWM signal through digital operation, wherein the current and the PWM duty ratio correspond to each other in the following relation:
Figure BDA0002634225100000071
wherein: dAt presentIs the duty cycle when the host power supply sends the PWM signal; daIs a first duty cycle of the PWM signal; dbIs a second duty cycle of the PWM signal; i isRated valueIs the rated output current of the host power supply; i isAt presentIs the current output current of the host power supply; the first duty cycle is set according to a minimum duty cycle of the PWM signal, the second duty cycle is set according to a maximum duty cycle of the PWM signal, and the minimum duty cycle and the maximum duty cycle are controlled by the host power supply.
The slave machine receives the PWM signal, identifies the duty ratio of the PWM signal, and converts the current given current through the following formula:
Figure BDA0002634225100000072
wherein: dCurrent 2Is the duty cycle of the PWM signal when the slave power supply receives demodulation; i isGIs the current given current of the slave power supply;
the current given current of the slave power supply is consistent with the output current of the master power supply, and the output current of the slave power supply can be adjusted through the regulator to be consistent with the current of the master power supply, so that the consistency of parallel output is achieved. As shown in fig. 3, the host power supply includes a PWM signal generator/receiver, a pulse generator, a regulator, and a digital controller. The master power supply and the slave power supply adopt DSP series power supply chips, and the specific model is TMS320F 28035.
Example 2
The present embodiment is different from embodiment 1 in that the master power supply and the plurality of slave power supplies are connected in series, and the processing flow of the given signal is as follows:
the host power supply converts the output voltage of the host power supply into the duty ratio of a PWM signal through digital operation, and the voltage and the PWM duty ratio correspond to each other in the following relation:
Figure BDA0002634225100000081
wherein: dAt presentIs the PWM signal duty cycle at the moment that the host power supply sends; daIs a PWM signal first duty cycle; dbIs the PWM signal second duty cycle; u shapeRated valueIs the rated output voltage of the host power supply; u shapeAt presentIs the current output voltage of the host power supply;
receiving the PWM signal from the slave, identifying the duty ratio of the PWM signal through a digital controller, and converting the current given voltage of the regulator through the following formula:
Figure BDA0002634225100000082
wherein: dCurrent 2Is the duty cycle of the PWM signal when the slave power supply receives demodulation; u shapeGIs the current given voltage of the slave power supply;
the current given voltage of the slave power supply is consistent with the output voltage of the master power supply, and the output voltage of the slave power supply can be adjusted by the regulator to be consistent with the voltage of the master power supply, so that the consistency of series output is achieved.
Example 3
This embodiment is a practical application example of embodiment 1 and embodiment 2:
when 1 main power supply and 2 slave power supplies are operated in parallel:
master-slave power supply IRated value1000A, the preset threshold is set to 8%, and the main power output I is output at the momentAt presentDesign D for 500Aa10% of DbAnd is 90%, the host sends out PWM duty ratio as follows:
Figure BDA0002634225100000091
at the moment, the master sends a PWM duty ratio of 50%, and the slave receives the duty ratio and calculates the current given output current:
Figure BDA0002634225100000092
slave current given IGAnd when the output current of the slave is 500A, the slave regulates the output current to 500A through a regulator, so that the output current of the master and the output current of the slave are consistent.
When 1 main power supply and 2 auxiliary power supplies are operated in series:
master-slave power supply URated value1000V, the preset threshold is set to 8%, at which time the main power output D isAt presentDesign D for 500Va10% of DbIs 90%, the host sends out PWM duty ratio of
Figure BDA0002634225100000093
At the moment, the master machine sends PWM duty ratio of 50%, and the slave machine calculates the current given output voltage after receiving the duty ratio
Figure BDA0002634225100000094
The slave current is given as UGAnd when the voltage is 500V, the slave machine regulates the output current to 500V through the regulator, so that the output voltage of the power supply of the master machine is consistent with that of the slave machine.
Example 4
As shown in fig. 4 and 5, a master-slave multi-power-supply system for master-slave multi-power communication includes a master power supply and a plurality of slave power supplies connected to the master power supply, wherein the master power supply communicates with the slave power supplies by using a master-slave multi-power-supply communication method of any one of embodiment 1 and embodiment 2. The master power supply is in communication connection with the slave power supplies respectively, fig. 4 is a schematic structural diagram of the power supplies in parallel connection, fig. 5 is a schematic structural diagram of the power supplies in series connection, the master power supply continuously sends a PWM signal, and the slave power supply continuously receives the PWM signal.
In this embodiment, the master power supply is in communication connection with the slave power supply respectively, which means that the two components can transmit PWM signals. The PWM wave signals can be transmitted through wired connection via communication cables (such as twisted pair, coaxial cable, and optical fiber), or through wireless communication via wireless transmission devices.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. A master-slave multi-machine communication method with multiple power supplies is characterized by comprising the following steps:
a: the master power supply outputs a PWM signal to the slave power supply;
b: the master power supply controls the on or off of the slave power supply by controlling the duty ratio of the PWM signal; taking the rising edge or the falling edge of the PWM signal as a synchronous signal of the master power supply and the slave power supply;
when the slave power supply is started, the PWM signal is also used for controlling the voltage value or the current value of the slave power supply.
2. The master-slave multi-machine communication method of multiple power supplies according to claim 1, wherein when the duty ratio of the PWM signal is greater than a preset threshold, the slave power supply is controlled to start; when the duty ratio of the PWM signal is smaller than or equal to the preset threshold value, controlling the slave power supply to be shut down;
wherein the preset threshold is greater than 0.
3. The master-slave multi-machine communication method of multiple power supplies according to claim 1, wherein the slave power supplies maintain phase consistency or phase error by identifying rising edge or falling edge time of the PWM signal.
4. The master-slave multi-machine communication method of multiple power supplies according to claim 2, wherein the master power supply controls a current value or a voltage value of the slave power supply by controlling a duty ratio of the PWM signal, wherein the duty ratio is greater than the preset threshold.
5. The master-slave multi-machine communication method of multiple power supplies according to claim 4, wherein when the master power supply and the plurality of slave power supplies are connected in parallel, the PWM signal controls the current value of the slave power supplies.
6. The master-slave multi-machine communication method for multiple power supplies according to claim 5, wherein the calculation formula of the PWM signal duty ratio for controlling the slave power supply current value is as follows:
Figure FDA0002634225090000021
wherein D isAt presentIs the duty ratio of the PWM signal currently controlling the current value of the slave power supply; daIs a first duty cycle of the PWM signal; dbIs a second duty cycle of the PWM signal; i isRated valueIs the rated output current of the host power supply; i isAt presentIs the current output current of the host power supply.
7. The master-slave multi-machine communication method of multiple power supplies according to claim 4, wherein when the master power supply and the plurality of slave power supplies are connected in series, the PWM signal controls the voltage value of the slave power supplies.
8. The master-slave multi-machine communication method of multiple power supplies according to claim 7, wherein the calculation formula of the duty ratio of the PWM signal for controlling the voltage value of the slave power supply is:
Figure FDA0002634225090000022
wherein D isAt presentIs the duty cycle of the PWM signal controlling the value of the slave supply voltage; daIs a PWM signal first duty cycle; dbIs the PWM signal second duty cycle; u shapeRated valueIs the rated output voltage of the host power supply; u shapeAt presentIs the current output voltage of the host power supply.
9. A multi-power system for master-slave multi-machine communication, comprising a master power supply and a plurality of slave power supplies connected to the master power supply, wherein the master power supply communicates with the slave power supplies by a multi-power master-slave multi-machine communication method according to any one of claims 1 to 8.
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