CN-121984312-A - Power supply control structure with hot plug and current sharing functions and control method

CN121984312ACN 121984312 ACN121984312 ACN 121984312ACN-121984312-A

Abstract

The invention provides a power supply control structure with hot plug and current sharing functions and a control method thereof, comprising a switch power supply unit, a hot plug power supply module, a central controller and a plurality of electric parameter acquisition modules, wherein the switch power supply unit comprises a main power supply module and one or more auxiliary power supply modules, the main power supply module and the auxiliary power supply modules are used for independently or parallelly controlling and feeding power into a load through the corresponding hot plug power supply modules, the working mode of the power supply modules is adjusted according to the magnitude of input voltage, the plug signals of the corresponding hot plug power supply modules are started according to the magnitude of output voltage of the main power supply modules, and the power supply modules are operated in a main-standby mode or a current sharing mode according to the fact that the output power is larger than the set power supply modules. The invention can not only rapidly respond and maintain stability when the output voltage changes, but also keep current stable when the load suddenly changes or the input fluctuates, thereby improving the dynamic performance and the protection capability.

Inventors

CHEN BAIXUAN
HUANG JUNYI
WEI CHENGQI
LIU FENG
DUAN SHIBIN
XIAO YUNZE
ZHANG MENGQI
Lan Xubei

Assignees

广西大学

Dates

Publication Date: 20260505
Application Date: 20260128

Claims (10)

1. A power supply control method with hot plug and current sharing functions is characterized by comprising the following steps: the method comprises the steps that a main power supply module and a secondary power supply module are used for independently or parallelly controlling and feeding power to a load through corresponding hot plug power supply modules, and input voltage Vin, output voltage V fb and output current Io of the main power supply module and the secondary power supply module are respectively collected; comparing the input voltage Vin with a preset input voltage, and adjusting the working mode of the master power module or/and the slave power module according to the comparison result to keep the output voltage V fb stable; Obtaining an output voltage V fb of the main power supply module, comparing the output voltage V fb of the main power supply module with a preset output voltage, and if the output voltage V fb of the main power supply module is equal to the preset output voltage, starting a plugging signal of a hot plug power supply module corresponding to the main power supply module, and independently feeding power into a load to supply power; If the output voltage V fb of the main power supply module is smaller than the preset output voltage, the unplugging signal of the hot plug power supply module corresponding to the main power supply module is closed, the output voltage V fb of the auxiliary power supply module is obtained, the output voltage V fb of the auxiliary power supply module is compared with the preset output voltage, and if the output voltage V fb of the auxiliary power supply module is equal to the preset output voltage, the unplugging signal is switched to the auxiliary power supply module and the corresponding hot plug power supply module, and the power is independently fed into a load for power supply; And calculating the output power Po of the current main power supply module or the slave power supply module by using the output voltage V fb and the output current Io, controlling the main power supply module or the slave power supply module to work in a main-standby power supply mode or a current-sharing power supply mode according to the relation between the output power Po and the preset power, and respectively feeding the power to a load in parallel through the corresponding hot plug power supply module by the main power supply module and the slave power supply module for supplying power if the current output power Po is larger than the preset power.
2. The power control method with hot plug and current sharing functions according to claim 1, wherein when comparing the output voltage V fb with a preset output voltage, if a voltage error Ve is generated, the voltage error V e is used as an input of a voltage loop PID, and the voltage loop PID calculates and obtains a current regulation parameter I ref for regulating the calculation of the current loop PID through PID; When comparing the output current Io with the current regulation parameter I ref , if a current error I e is generated, taking the current error Ie as the input of a current loop PID, and performing PID calculation on the current loop PID according to the magnitude and the change trend of the current error Ie to obtain a switch control signal PWM, and regulating the duty ratio of the switch control signal PWM based on the working mode of the master power module or/and the slave power module to be used for compensating and regulating the output voltage V fb of the master power module or/and the slave power module so as to keep the output voltage V fb of the master power module or/and the slave power module stable.
3. The power control method with hot plug and current sharing functions according to claim 2, wherein the step of adjusting the duty ratio of the switch control signal PWM based on the operation mode of the master power module or/and the slave power module comprises the steps of determining the interval range of the preset input voltage where the input voltage Vin is located, determining the operation mode of the power module or the slave power module, and adjusting the duty ratio of the switch control signal PWM based on the operation mode of the power module or the slave power module.
4. The power control method with hot plug and current sharing functions according to claim 3, wherein the working modes of the master power module and the slave power module respectively comprise a first working mode, a second working mode and a third working mode, the duty cycle of the switch control signal PWM comprises a first signal PWM duty cycle d1 and a second signal PWM duty cycle d2, the preset input voltage comprises a first preset input voltage and a second preset input voltage, and the interval range between the preset input voltages based on the input voltage Vin comprises the following steps: if the input voltage Vin is greater than or equal to a first preset input voltage, the first signal PWM duty cycle d1 of the main power supply module or the auxiliary power supply module when working in a first working mode is regulated, and the second signal PWM duty cycle d2 is kept unchanged, wherein the second signal PWM duty cycle has a fixed second fixed duty cycle which is 95%; If the input voltage Vin is smaller than or equal to a second preset input voltage, the second signal PWM duty ratio d2 of the main power supply module or the auxiliary power supply module when working in a second working mode is adjusted, and the first signal PWM duty ratio d1 is kept unchanged, wherein the first signal PWM duty ratio d1 has a fixed first fixed duty ratio, and the first fixed duty ratio is 5%; And if the input voltage Vin is larger than the second preset input voltage and smaller than the first preset input voltage, adjusting the first signal PWM duty ratio d1 and the second signal PWM duty ratio d2 of the master power module or the slave power module when the master power module or the slave power module works in the third working mode.
5. The power supply control method with the hot plug and current sharing function according to claim 1, wherein if the current output power Po is greater than a preset power, the relation between the output voltage V fb and the output current Io satisfies ：V fb = V REF –k 1 ×I O – k 2 ×η(I O )×I O ×[1+α×(I O /I m ) m ],, wherein k 1 ,k 2 is a voltage droop coefficient, eta (I O ) is an actual efficiency value of a current working power supply module when the output current is Io, I m is a rated output current of the power supply module, alpha is a nonlinear strengthening coefficient, the value range is 0.1-0.5, m is a nonlinear index, and the value is an integer greater than 1.
6. The power control method with hot plug and current sharing functions according to claim 1 or 5, further comprising, if the current output power Po is greater than a preset power and the current operating temperature T of the current main power module or the slave power module is greater than a preset temperature T0, satisfying the relationship between the output voltage V fb and the output current Io: V fb =V REF –k 1 ×I O – k 2 ×η(I O )×I O ×[1+α×(Io/I m ) m ]-k3* (T–T0) * I O ; k 1 =k 0 e β |ΔI| ; k 0 is a base sag coefficient greater than 0, Δi=io Iavg is the deviation value of the output current of the current power supply module and the current sharing target current, k 1 ,k 2 is the voltage droop coefficient, k3 is the temperature compensation coefficient, eta (I O ) is the actual efficiency value of the current power supply module when the output current is Io, I m is the rated output current of the current power supply module, alpha is the nonlinear strengthening coefficient, the value range is 0.1-0.5, m is the nonlinear index, and the value is an integer larger than 1.
7. A power control structure with hot plug and current sharing functions for executing the power control method according to any one of claims 1 to 6 is characterized by comprising a switch power supply unit, a hot plug power supply module, a central controller and a plurality of electric parameter acquisition modules, wherein the switch power supply unit comprises a main power supply module and one or more auxiliary power supply modules, the output end of the main power supply module and the output end of the auxiliary power supply module are respectively connected with the hot plug power supply module, the electric parameter acquisition modules are respectively connected with the input end and the output end of the main power supply module and the input end and the output end of the auxiliary power supply module, the acquisition output end of the electric parameter acquisition modules is connected with the acquisition input end of the central controller, the control end of the central controller is respectively connected with the control end of the main power supply module, the control end of the auxiliary power supply module and the control end of the hot plug power supply module, the electric parameter acquisition modules are used for respectively acquiring the input voltage, the Vin V fb and the output current Io of the main power supply module and the auxiliary power supply module, and the auxiliary power supply module are independently fed to the power supply module or the auxiliary power supply module in parallel mode according to the acquired voltage V fb and the current.
8. The power supply control structure with the hot plug and current sharing function according to claim 7, wherein the main power supply module and the auxiliary power supply module have the same structure and respectively comprise a power conversion unit, and the power conversion unit is an H-bridge or half-bridge circuit formed by four switching tubes and is used for converting input voltage into output voltage; The central controller comprises a main control unit and a double-loop control unit, the double-loop control unit comprises a voltage loop controller and a current loop controller, the voltage loop controller is used for comparing an output voltage V fb with a preset output voltage to obtain a voltage error V e and performing PID calculation on the voltage error V e to obtain a current regulation parameter I ref , and the current loop controller is used for comparing the current regulation parameter I ref instruction with an output current Io to obtain a current error Ie and performing PID calculation according to the magnitude and the change trend of the current error Ie to obtain switch control signals PWM with different duty ratios so as to drive the power conversion unit; The main control unit is used for collecting input voltage Vin of the main power supply module or/and the auxiliary power supply module, judging that the power conversion unit works in different working modes according to the range of the input voltage Vin, and the current loop controller adjusts the duty ratio of the switching control signal PWM according to the different working modes.
9. The power control structure with hot plug and current sharing functions according to claim 8, wherein the master control unit is further configured to sample output power Po of the collecting master power module and/or the slave power module, and control the master power module and the slave power module to operate in a power supply mode or a current sharing power supply mode according to a relation between the output power Po and a preset power.
10. The power control structure with hot plug and current sharing functions according to claim 7, 8 or 9, wherein the power control structure further comprises a temperature sensor, the temperature sensor is used for collecting the temperature T of the main power module or/and the secondary power module when the main power module is currently operated, the main control unit obtains the temperature T of the main power module or/and the secondary power module when the main power module or/and the secondary power module is currently operated, if the current output power Po of the main power module or/and the secondary power module is larger than the preset power, and when the current temperature T of the main power module or the secondary power module is larger than the preset temperature T0, the main power module and the secondary power module are controlled to be in the current sharing power supply mode.

Description

Power supply control structure with hot plug and current sharing functions and control method Technical Field The invention belongs to the technical field of power supply conversion control, and particularly relates to a power supply control structure with hot plug and current sharing functions and a control method. Background The pitch control system is one of the core parts of the wind generating set control system, the power supply of the existing wind generating set pitch control system is supplied with power by adopting a traditional switching power supply, and once the power supply fails, the control system is powered down, and when the power supply of the pitch control system fails, a fan is stopped, so that production stagnation is caused. In addition, the conventional power supply is insufficient in stability in a wide input voltage range, and needs to be powered off for replacement when a fault occurs, so that production is interrupted. Some systems try to adopt parallel structures or external current limiting circuits, but still have the problems of unstable current sharing, high system complexity, complicated power supply replacement steps and the like, and lack of real-time monitoring on the power supply of the pitch system of the wind driven generator. Therefore, the power supply reliability of the wind driven generator pitch control system directly influences the operation safety and the power generation efficiency of the fan, and the switching power supply has the characteristics of high efficiency control and safety and reliability in a wide input voltage range, is widely applied to the fields of fan pitch control systems and industrial control, and has important engineering significance in developing a power supply system which can stably work in the wide input voltage range and supports a hot plug function. Disclosure of Invention The invention aims to provide a power supply control structure with hot plug and current sharing functions and a control method, wherein the power supply control structure can not only rapidly respond and maintain stability when output voltage changes, but also maintain current stability when loads suddenly change or input fluctuates, thereby improving dynamic performance and protection capability, effectively realizing balanced use of double power supply modules, ensuring that the double power supply modules are always in a working state of mutual hot backup, and further improving long-term operation reliability of a power supply control system. In order to achieve the above purpose, the present invention adopts the following technical scheme: according to one aspect of the invention, the invention provides a power supply control method with hot plug and current sharing functions, which comprises the following steps: the method comprises the steps that a main power supply module and a secondary power supply module are used for independently or parallelly controlling and feeding power to a load through corresponding hot plug power supply modules, and input voltage Vin, output voltage V fb and output current Io of the main power supply module and the secondary power supply module are respectively collected; comparing the input voltage Vin with a preset input voltage, and adjusting the working mode of the master power module or/and the slave power module according to the comparison result to keep the output voltage V fb stable; Obtaining an output voltage V fb of the main power supply module, comparing the output voltage V fb of the main power supply module with a preset output voltage, and if the output voltage V fb of the main power supply module is equal to the preset output voltage, starting a plugging signal of a hot plug power supply module corresponding to the main power supply module, and independently feeding power into a load to supply power; If the output voltage V fb of the main power supply module is smaller than the preset output voltage, the unplugging signal of the hot plug power supply module corresponding to the main power supply module is closed, the output voltage V fb of the auxiliary power supply module is obtained, the output voltage V fb of the auxiliary power supply module is compared with the preset output voltage, and if the output voltage V fb of the auxiliary power supply module is equal to the preset output voltage, the unplugging signal is switched to the auxiliary power supply module and the corresponding hot plug power supply module, and the power is independently fed into a load for power supply; And calculating the output power Po of the current main power supply module or the slave power supply module by using the output voltage V fb and the output current Io, controlling the main power supply module or the slave power supply module to work in a main-standby power supply mode or a current-sharing power supply mode according to the relation between the output power Po and the preset power, and respectively feeding the power to a