WO2019228301A1 - 均流控制方法、装置、设备及计算机可读存储介质 - Google Patents

均流控制方法、装置、设备及计算机可读存储介质 Download PDF

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Publication number
WO2019228301A1
WO2019228301A1 PCT/CN2019/088540 CN2019088540W WO2019228301A1 WO 2019228301 A1 WO2019228301 A1 WO 2019228301A1 CN 2019088540 W CN2019088540 W CN 2019088540W WO 2019228301 A1 WO2019228301 A1 WO 2019228301A1
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Prior art keywords
current sharing
power module
signal
current
output
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PCT/CN2019/088540
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English (en)
French (fr)
Inventor
高云
任亚奇
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中兴通讯股份有限公司
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Priority to JP2020566772A priority Critical patent/JP2021526346A/ja
Priority to EP19811772.3A priority patent/EP3796530A4/en
Publication of WO2019228301A1 publication Critical patent/WO2019228301A1/zh

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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
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/625—Regulating voltage or current wherein it is irrelevant whether the variable actually regulated is ac or dc
    • 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
    • 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
    • H02M1/0025—Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel

Definitions

  • the present disclosure relates to, but is not limited to, the field of communication technologies.
  • the power module When multiple identical power supplies are working in parallel, the output current of each power supply is different due to the differences in the parameters of the circuit components, resulting in different electrical and thermal stresses when different power supplies are working, which affects the reliable operation of the entire parallel system.
  • the power module To ensure the reliability of the system power supply, the power module must have the function of parallel current sharing.
  • a current sharing control method including: acquiring a sampling signal of a power circuit; converting the sampling signal into a digital signal; and calibrating the digital signal to obtain the sampling signal and output A correspondence relationship between currents; and performing current sharing control on at least one power module according to the correspondence relationship.
  • a current sharing control device including: a sampling module configured to acquire a sampling signal of a power circuit; a conversion module configured to convert the sampling signal into a digital signal; a calibration module, It is configured to calibrate the digital signal to obtain a corresponding relationship between the sampling signal and the output current; and a control module configured to perform current sharing control on at least one power module according to the corresponding relationship.
  • an electronic device including a memory and a processor, in which at least one computer program executed by the processor is stored, and when the processor executes the computer program, A current sharing control method according to the present disclosure is performed.
  • a computer-readable storage medium having stored thereon a computer program, and the processor executes the current sharing control method according to the present disclosure when the computer program is executed.
  • FIG. 1 is a flowchart of a current sharing control method according to an embodiment of the present disclosure
  • FIG. 2 is a hardware circuit diagram of a current sharing control scheme of a power module according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of multiple power modules working in parallel according to an embodiment of the present disclosure
  • step S40 is a flowchart of step S40 in the current sharing control method shown in FIG. 1;
  • FIG. 5 is a hardware circuit diagram of a current sharing control scheme of a power module according to an embodiment of the present disclosure
  • FIG. 6 is a hardware circuit diagram of a current sharing control scheme of a power module according to an embodiment of the present disclosure
  • FIG. 7 is a hardware circuit diagram of a current sharing control scheme of a power module according to an embodiment of the present disclosure
  • FIG. 8 is a schematic structural block diagram of a current sharing control device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural block diagram of a control module in the current sharing control device shown in FIG. 8.
  • FIG. 10 is a schematic structural block diagram of a calibration module in the current sharing control device shown in FIG. 8.
  • the digital current sharing control scheme usually uses the output current sampling amplifier module to sample the current of the power supply.
  • the output current sampling and amplification module usually uses sampling resistors, copper traces of printed circuit boards or internal resistances of power devices for sampling. Due to the parameters of the sampling resistors, copper traces of printed circuit boards or the resistance of the power devices themselves Difference, even if the same current flows, the voltage obtained by sampling is different. In the case where the sampled voltage is directly used for current sharing control, the difference in sampling voltage will cause deviations in the current sharing control, which will affect the current sharing effect of the entire system and the reliability of the system's long-term operation.
  • FIG. 1 is a flowchart of a current sharing control method according to an embodiment of the present disclosure.
  • the current sharing control method may include steps S10 to S40.
  • step S10 a sampling signal of the power circuit is acquired.
  • step S20 the sampling signal is converted into a digital signal.
  • step S30 the digital signal is calibrated to obtain the correspondence between the sampling signal and the output current.
  • step S40 current sharing control is performed on at least one power module according to the corresponding relationship.
  • the embodiments of the present disclosure by performing conversion calibration on the sampling signals to obtain the corresponding relationship between the sampling signals and the output current, it is possible to eliminate the deviation caused by the differences between the sampling circuits on the current sharing control of the parallel power modules, and improve The current sharing effect of the power module further improves the reliability of the system.
  • FIG. 2 is a hardware circuit diagram of a current sharing control scheme of a power module according to an embodiment of the present disclosure.
  • the hardware circuit diagram of the current sharing control scheme of the power module includes a power circuit and a control circuit.
  • the two ends of the power circuit are respectively connected to the input end and the output end of the power module.
  • the control circuit includes a first analog-to-digital conversion unit AD1, a calibration module, a digital-to-analog conversion unit DA, a second analog-to-digital conversion unit AD2, and a current sharing bus resistance R.
  • the first analog-to-digital conversion unit AD1 converts the sampling signal sampled from the power circuit into a digital signal, and then calibrates the digital signal through an algorithm stored in a calibration module to obtain a correspondence between the sampling signal and the output current.
  • the power module can be controlled for current sharing according to the corresponding relationship between the obtained sampling signal and the output current, so that the output current of each power module is only related to the sampling signal, thereby eliminating the differential current sharing of the sampling circuit. Impact of circuit operation.
  • the calculation output signal of the power module (Vl1 shown in the figure) needs to be calculated in real time, so the program used to calculate Vl1 can be set in the interrupt program of the control circuit, or a dedicated hardware circuit is used to process it to speed up Calculated speed. As another embodiment, the hardware circuit for obtaining Vl1 can also be built outside the control circuit. The specific implementation manner of calculating Vl1 will be described in detail later.
  • the power circuit can be controlled by the control signal to reduce the power module It is used as the reference value of the output voltage to reduce the output current of the power module.
  • the power circuit can be controlled by a control signal to Increasing the reference value for the output voltage of the power module to increase the output current of the power module.
  • the reference value for the output voltage of the power module may not be adjusted.
  • FIG. 3 is a schematic diagram of parallel operation of multiple power modules according to an embodiment of the present disclosure.
  • the corresponding relationship between the respective sampling signals and the output current obtained by the control circuit of each power module, and the current sharing control of the power circuit of the power module is performed according to the obtained corresponding relationship, which improves the power module's
  • the current sharing effect improves the reliability of the system.
  • FIG. 4 is a flowchart of step S40 in the current sharing control method shown in FIG. 1.
  • step S40 in the embodiment of the current sharing control method described with reference to FIG. 1 may include steps S41 to S46.
  • step S41 the voltage signal VIshare of the current sharing bus is obtained.
  • step S42 the calculated output signal Vl1 of the power module is obtained according to the corresponding relationship.
  • step S43 the calculated output signal Vl1 of the power module is compared with the voltage VIshare of the current sharing bus.
  • the calculated output signal Vl1 can be compared with the voltage VIshare of the current sharing bus in the second analog-to-digital conversion unit AD2 shown in FIG. 2. As another embodiment, as shown in FIG. 5, the calculated output signal Vl1 may also be compared with the voltage VIshare of the current sharing bus through an operational amplifier or a comparator.
  • step S44 when the difference between the calculated output signal Vl1 of the power module and the voltage VIshare of the current sharing bus is greater than the first threshold, the reference value used by the power module to output the voltage is reduced.
  • step S45 when the difference between the calculated output signal Vl1 of the power module and the voltage VIshare of the current sharing bus is less than the second threshold, the reference value for the output voltage of the power module is increased.
  • step S30 in the embodiment of the current sharing control method described with reference to FIG. 1 may include one of the following: using a two-point method to calibrate the digital signal to obtain a linear relationship between the sampling signal and the output current. ; Use the quadratic curve fitting method to calibrate the digital signal to obtain the quadratic function relationship between the sampling signal and the output current; use piecewise linear method to calibrate the digital signal to obtain the relationship between the sampling signal and the output current. Piecewise linear relationship; and calibration of the digital signal to obtain a custom function relationship between the sampled signal and the output current.
  • V k * I + b: (1)
  • the output current of the power module can be calculated from the measured voltage value through the above relationship (6). Then use the same reference value as the reference value for the output voltage, use the digital-to-analog conversion unit DA to convert the current value into the calculated output signal Vl1 of the power module, and connect to the current sharing bus through the current sharing bus resistor R.
  • the functional relationship between the sampling signal and the output current signal can be:
  • V A * I 2 + B * I + C (7)
  • Multi-point sampling can be performed as needed, and the A, B, and C coefficients corresponding to each power module are calculated. Similar to the two-point calibration, the output current of the power module can be calculated based on the relationship between the output current I and the sampling signal V derived from the measured voltage value. Then use the same reference value as the reference value for the output voltage, use the digital-to-analog conversion unit DA to convert the current value into the calculated output signal Vl1 of the power module, and connect to the current sharing bus through the current sharing bus resistor R.
  • the obtained sampling signal is V10 and the corresponding digital signal is D10; when the output current of the power module is I20 , The obtained sampling signal is V20 and the corresponding digital signal is D20; when the output current of the power module is I30, the obtained sampling signal is V30 and the corresponding digital signal is D30; and when the output current of the power module is I40, The obtained sampling signal is V40, and the corresponding digital signal is D40.
  • the piecewise linear method when the output current ranges from I10 to I20 (including the two endpoints of I10 and I20), the relationship between the sampling signal V and the output current I is:
  • V k1 * I + b1: (8)
  • V k2 * I + b2: (9)
  • parameters such as k1, b1, k2, and b2 of each power module can be obtained.
  • the present disclosure is not limited thereto, and for example, the calculation may be divided into three or more interval segments as required.
  • the sampling signal and output current are not necessarily linear or quadratic, but may be cubic or higher.
  • a custom function relationship between the sampling signal and the output current can be obtained according to the actual situation.
  • the current sharing mode of the current sharing bus may be average current sharing, maximum current sharing, or other current sharing methods.
  • FIG. 6 is a hardware circuit diagram of a current sharing control scheme of a power module according to an embodiment of the present disclosure.
  • the current sharing bus resistance R is provided inside the power module, but is externally connected to the control circuit.
  • FIG. 7 is a hardware circuit diagram of a current sharing control scheme of a power module according to an embodiment of the present disclosure.
  • the current sharing bus resistance R is provided outside the power module.
  • the digital-to-analog conversion is not performed on the output current.
  • the calibration algorithm can be linear calibration, high-order function calibration, or other custom calibration algorithms.
  • the current sharing control method may be average current sharing, maximum current sharing, or other current sharing algorithms.
  • FIG. 8 is a schematic structural block diagram of a current sharing control device according to an embodiment of the present disclosure.
  • the current sharing control device may include a sampling module 10, a conversion module 20, a calibration module 30, and a control module 40.
  • the sampling module 10 is configured to acquire a current sampling signal of a power circuit.
  • the conversion module 20 is configured to convert a sampling signal into a digital signal.
  • the calibration module 30 is configured to calibrate a digital signal to obtain a correspondence between a sampled signal and an output current.
  • the control module 40 is configured to perform current sharing control on at least one power module according to the corresponding relationship.
  • FIG. 9 is a schematic structural block diagram of a control module 40 in the current sharing control device shown in FIG. 8.
  • control module 40 includes a sampling unit 41, a calculation unit 42, a comparison unit 43, and an adjustment unit 44.
  • the sampling unit 41 is configured to acquire a voltage signal of the current sharing bus.
  • the calculation unit 42 is configured to obtain a calculation output signal of the power module according to the corresponding relationship.
  • the comparison unit 43 is configured to compare the calculated output signal of the power module with the voltage of the current sharing bus.
  • the comparison unit 43 may be implemented as a second analog-to-digital conversion unit AD2 shown in FIG. 2.
  • the comparison unit 43 may also be implemented by a comparator as shown in FIG. 5.
  • the adjusting unit 44 is configured to reduce the reference value for the output voltage of the power module when the difference between the calculated output signal of the power module and the voltage of the current sharing bus is greater than the first threshold; When the voltage difference is less than the second threshold, increase the reference value for the output voltage of the power module; and when the difference between the calculated output signal of the power module and the voltage of the current sharing bus is less than or equal to the first threshold and greater than or equal to the second threshold At the threshold, the reference value used by the power module for the output voltage is not adjusted.
  • the adjusting unit 44 is configured to reduce the reference value for the output voltage of the power module when the difference between the calculated output signal of the power module and the voltage of the current sharing bus is greater than the first threshold; When the voltage difference is less than the second threshold value, increase the reference value used by the power module for output voltage; and when the difference between the calculated output signal of the power module and the voltage of the current sharing bus is less than or equal to the first threshold value and greater than or equal to the second threshold value At the threshold, the reference value used by the power module for the output voltage is not adjusted.
  • FIG. 10 is a schematic structural block diagram of a calibration module 30 in the current sharing control device shown in FIG. 8.
  • the calibration module 30 may include at least one of a linear calibration unit 31, a quadratic function calibration unit 32, a piecewise linear calibration unit 33, and a custom calibration unit 34.
  • the linear calibration unit 31 is configured to calibrate a digital signal using a two-point method to obtain a linear relationship between a sampling signal and an output current;
  • the quadratic function calibration unit 32 is configured to calibrate the digital signal using a quadratic curve fitting method to obtain a functional relationship between the sampled signal and the output current.
  • the piecewise linear calibration unit 33 is configured to calibrate the digital signal using the piecewise linear method to obtain a piecewise linear relationship between the sampled signal and the output current.
  • the custom calibration unit 34 is configured to calibrate a digital signal to obtain a custom function relationship between a sampled signal and an output current.
  • An embodiment of the present disclosure further provides an electronic device including a memory and a processor. At least one computer program executed by the processor is stored in the memory. When the processor executes the computer program, the processing is performed.
  • the controller performs a current sharing control method according to various embodiments of the present disclosure.
  • An embodiment of the present disclosure further provides a computer-readable storage medium having stored thereon a computer program that, when executed by a processor, executes a current sharing control method according to various embodiments of the present disclosure.
  • the current sharing control method, device, device, and computer-readable storage medium of the embodiments of the present disclosure by converting and calibrating the sampling signals to obtain the correspondence between the sampling signals and the output current, it is possible to eliminate the The discrepancy caused by the difference to the current sharing control of the parallel power modules improves the current sharing effect of the power modules, thereby improving the reliability of the system.
  • the computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk, FLASH, etc.), and includes several instructions for enabling
  • a terminal device which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc. executes the methods described in the embodiments of the present disclosure.

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Abstract

一种均流控制方法、装置、设备及计算机可读存储介质。所述均流控制方法包括：获取功率电路的采样信号（S10）；将所述采样信号转换为数字信号（S20）；对所述数字信号进行校准，以得到所述采样信号与输出电流之间的对应关系（S30）；以及根据所述对应关系对至少一个电源模块进行均流控制（S40）。

Description

均流控制方法、装置、设备及计算机可读存储介质 技术领域
本公开涉及(但不限于)通信技术领域。
背景技术
在通信电源领域中，为了满足负载功率和供电可靠性的要求，采用多个电源并联来实现大功率输出是非常重要的。电源模块并联使用具有易扩展、兼容性好、冗余备份等优点，这些优势推动着电源领域在并联均流技术方面的研究和发展。
多个相同的电源在并联工作时，由于电路元器件参数的差异，各个电源的输出电流有所不同，导致不同的电源工作时电应力和热应力的不同，影响整个并联系统的可靠运行，为了保证系统供电的可靠性，电源模块必须具备并联均流的功能。
随着电源系统朝着数字化方向的演变，高度集成、易于移植的数字电源系统成为了整个电源系统的发展方向，作为数字电源设计中重要的一环，均流技术的数字控制方案的提出已经迫在眉睫。
发明内容
根据本公开的一个方面，提供一种均流控制方法，包括：获取功率电路的采样信号；将所述采样信号转换为数字信号；对所述数字信号进行校准，以得到所述采样信号与输出电流之间的对应关系；以及根据所述对应关系对至少一个电源模块进行均流控制。
根据本公开的另一个方面，提供一种均流控制装置，包括：采样模块，其构造为获取功率电路的采样信号；转换模块，其构造为将所述采样信号转换为数字信号；校准模块，其构造为对所述数字信号进行校准，以得到所述采样信号与输出电流之间的对应关系；以及控制模块，其构造为根据所述对应关系对至少一个电源模块进行均流控制。
根据本公开的再一个方面，提供一种电子设备，包括存储器和 处理器，在所述存储器中存储有由所述处理器执行的至少一个计算机程序，所述处理器在执行所述计算机程序时执行根据本公开的均流控制方法。
根据本公开的再一个方面，提供一种计算机可读存储介质，其上存储有计算机程序，所述处理器在执行所述计算机程序时执行根据本公开的均流控制方法。
附图说明
图1为根据本公开实施例的均流控制方法的流程图；
图2为根据本公开实施例的电源模块的均流控制方案的硬件电路图；
图3为根据本公开实施例的多电源模块并联工作的示意图；
图4为图1所示均流控制方法中步骤S40的流程图；
图5为根据本公开实施例的电源模块的均流控制方案的硬件电路图；
图6为根据本公开实施例的电源模块的均流控制方案的硬件电路图；
图7为根据本公开实施例的电源模块的均流控制方案的硬件电路图；
图8为根据本公开实施例的均流控制装置的示意性结构框图；
图9为图8所示均流控制装置中控制模块的示意性结构框图；以及
图10为图8所示均流控制装置中校准模块的示意性结构框图。
具体实施方式
为了使本公开所要解决的技术问题、技术方案及有益效果更加清楚、明白，以下结合附图和实施例，对本公开进行进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本公开，并不用于限定本公开。
数字均流控制方案通常采用输出电流采样放大模块来对电源的 电流进行采样。输出电流采样放大模块通常采用采样电阻、印刷电路板的铜皮走线或是功率器件内部的电阻来进行采样，由于采样电阻、印刷线路板的铜皮走线或是功率器件自身的电阻的参数的差异，即使流过相同电流，采样得到的电压也不同。在将采样得到的电压直接用于均流控制的情况下，采样电压的差异会导致均流控制出现偏差，从而影响整个系统的均流效果和系统长期工作的可靠性。
图1为根据本公开实施例的均流控制方法的流程图。
如图1所示，根据本公开实施例的均流控制方法可以包括步骤S10至S40。
在步骤S10，获取功率电路的采样信号。
在步骤S20，将采样信号转换为数字信号。
在步骤S30，对数字信号进行校准，以得到采样信号与输出电流之间的对应关系。
在步骤S40，根据所述对应关系对至少一个电源模块进行均流控制。
根据本公开的实施例，通过对采样信号进行转换校准，获得采样信号与输出电流之间的对应关系，可以消除各个采样电路之间的差异对并联电源模块的均流控制造成的偏差，提高了电源模块的均流效果，进而提高了系统的可靠性。
图2为根据本公开实施例的电源模块的均流控制方案的硬件电路图。
在一些实施例中，如图2所示，电源模块的均流控制方案的硬件电路图包括功率电路和控制电路。功率电路的两端分别连接电源模块的输入端和输出端。控制电路包括第一模数转换单元AD1、校准模块、数模转换单元DA、第二模数转换单元AD2和均流母线电阻R。第一模数转换单元AD1将从功率电路采样得到的采样信号转换为数字信号，然后通过存储在校准模块中的算法对数字信号进行校准，以得到采样信号与输出电流之间的对应关系。此后，可以根据所得到的采样信号与输出电流之间的对应关系对电源模块进行均流控制，这样每个电源模块的输出电流只与采样信号有关，从而消除了采样电路的差 异性对均流电路工作的影响。
电源模块的计算输出信号(图中所示Vl1)需要实时计算得出，因此可以将用于计算得到Vl1的程序设置在控制电路的中断程序，或是采用专用的硬件电路来进行处理，以加快计算的速度。作为另一种实施例，用于得到Vl1的硬件电路也可以搭建在控制电路之外。稍后将详细说明计算得到Vl1的具体实现方式。
当电源模块的计算输出信号Vl1与均流母线的电压VIshare之差大于第一阈值(第一阈值为自定义的大于或等于零的值)时，可以通过控制信号控制功率电路，以减小电源模块用于输出电压的基准值，达到减小电源模块的输出电流的目的。另一方面，当电源模块的技术输出信号Vl1与均流母线的电压VIshare之差小于第二阈值(第二阈值为自定义的小于或等于零的值)时，可以通过控制信号控制功率电路，以提高电源模块用于输出电压的基准值，达到增大电源模块的输出电流的目的。此外，当电源模块的计算输出信号Vl1与均流母线的电压VIshare之差小于或等于第一阈值并且大于或等于第二阈值时，可以不对电源模块用于输出电压的基准值进行调节。
根据本公开的实施例，在采样电路中不需要采用高精度的采样电阻，大幅减小电源的布板面积，降低电源的成本，提高了电源整体的转换效率。
图3为根据本公开实施例的多电源模块并联工作示意图。
如图3所示，各电源模块的控制电路分别得到的各自的采样信号与输出电流之间的对应关系，并根据得到的对应关系对电源模块的功率电路进行均流控制，提高了电源模块的均流效果，进而提高了系统的可靠性。
图4为图1所示均流控制方法中步骤S40的流程图。
如图4所示，参照图2描述的电源模块经由均流母线电阻R连接到均流母线，并参照图1描述的均流控制方法的实施例中的步骤S40可以包括步骤S41至S46。
在步骤S41，获取均流母线的电压信号VIshare。
在步骤S42，根据对应关系得到电源模块的计算输出信号Vl1。
在步骤S43，对电源模块的计算输出信号Vl1与均流母线的电压VIshare进行比较。
可以在图2所示的第二模数转换单元AD2中对计算输出信号Vl1与均流母线的电压VIshare进行比较。作为另一种实施例，如图5所示，也可以通过运算放大器或比较器对计算输出信号Vl1与均流母线的电压VIshare进行比较。
在步骤S44，当电源模块的计算输出信号Vl1与均流母线的电压VIshare之差大于第一阈值时，减小电源模块用于输出电压的基准值。
在步骤S45，当电源模块的计算输出信号Vl1与均流母线的电压VIshare之差小于第二阈值时，增大电源模块用于输出电压的基准值。
在不是S46，当电源模块的计算输出信号Vl1与均流母线的电压VIshare之差小于或等于第一阈值并且大于或等于第二阈值时，不对电源模块用于输出电压的基准值进行调节。
在一些实施例中，参照图1描述的均流控制方法的实施例中的步骤S30可以包括下列之一：采用两点法对数字信号进行校准，以得到采样信号与输出电流之间的线性关系；采用二次曲线拟合方法对数字信号进行校准，以得到采样信号与输出电流之间的二次函数关系；采用分段线性法对数字信号进行校准，以得到采样信号与输出电流之间的分段线性关系；以及对数字信号进行校准，以得到采样信号与输出电流之间的自定义函数关系。
在采用两点法对数字信号进行校准的情况下，例如参见图2，当电源模块的输出电流为I10时，得到的采样信号为V10，采样信号经第一模数转换单元AD1进行模数转换后得到数字信号D10；此外，当电源模块的输出电流为I20时，得到的采样信号为V20，采样信号经第一模数转换单元AD1进行模数转换后得到数字信号为D20。在使用两点法进行校准时，采样信号V和输出电流I的关系为：
V＝k*I+b                                      (1)
带入以上数据，可以得到关系式：
D10＝k*I10+b                                  (2)
D20＝k*I20+b                                  (3)
推导得出：
k＝(D20-D10)/(I20-I10)                          (4)
b＝D10-k*I10                                   (5)
这样就可以得出输出电流I和采样信号V之间的关系为：
I＝(V-b)/k                                     (6)
由于不同的电源模块内部的电阻不同，因此不同电源模块的k和b值可以是不同的。可以通过以上关系式(6)根据测量得到的电压值计算得到电源模块的输出电流。然后采用与用于输出电压的基准值相同基准值，利用数模转换单元DA将电流值转换为电源模块的计算输出信号Vl1，并通过均流母线电阻R外接到均流母线。
在采用二次曲线拟合方法对数字信号进行校准的情况下，采样信号与输出电流信号之间的函数关系可以为：
V＝A*I 2+B*I+C                                  (7)
可以根据需要进行多点采样，并计算分别对应于每个电源模块的A、B和C系数。类似于两点法校准，可以通过推导得出的输出电流I和采样信号V之间的关系，根据测量得到的电压值计算得到电源模块的输出电流。然后采用与用于输出电压的基准值相同基准值，利用数模转换单元DA将电流值转换为电源模块的计算输出信号Vl1，并通过均流母线电阻R外接到均流母线。
在采用分段线性法对数字信号进行校准的情况下，例如，当电源模块的输出电流为I10时，得到的采样信号为V10，对应的数字信号为D10；当电源模块的输出电流为I20时，得到的采样信号为V20，对应的数字信号为D20；当电源模块的输出电流为I30时，得到的采样信号为V30，对应的数字信号为D30；并且当电源模块的输出电流为I40时，得到的采样信号为V40，对应的数字信号为D40。在使用分段线性法校准时，当输出电流的范围为I10到I20时(包含I10和I20两个端点)，采样信号V和输出电流I的关系为：
V＝k1*I+b1                                     (8)
当输出电流的范围为I30到I40时(包含I30和I40两个端点)，采样信号V和输出电流I的关系为：
V＝k2*I+b2                                     (9)
经推导，得到：
k1＝(D20-D10)/(I20-I10)
b1＝D10-k1*I10
k2＝(D40-D30)/(I40-I30)
b2＝D30-k2*I30
这样就可以得出各个电源模块的k1、b1、k2和b2等参数。虽然上述实施例将分段线性法描述为分成两个区间段进行计算，但本公开不限于此，例如，可以根据需要分成三个或更多的区间段进行计算。
在某些场合下，采样信号和输出电流并不一定是线性关系或二次函数关系，有可能是三次函数或是更高次函数的关系。可以根据实际情况，得到采样信号与输出电流之间的自定义函数关系。
均流母线的均流方式可以为平均值均流，也可以为最大值均流或者其他均流方式。
图6为根据本公开实施例的电源模块的均流控制方案的硬件电路图。
如图6所示，与图2所示的硬件电路图相比，在根据本实施例的硬件电路图中，均流母线电阻R设置于电源模块内部，但外接于控制电路。
图7为根据本公开实施例的电源模块的均流控制方案的硬件电路图。
如图7所示，与图2所示的硬件电路图相比，在根据本实施例的硬件电路图中，均流母线电阻R设置于电源模块外部。
在一些实施例中，由于电源模块已经根据测量得到的电压值计算得出了电源模块的输出电流，因此没有对输出电流进行数模转换。在此情况下，校准算法可以为线性校准，也可以为高次函数校准或是其他的自定义校准算法。均流的控制方式可以是平均值均流，也可以是最大值均流或是其他的均流算法。
图8为根据本公开实施例的均流控制装置示意性结构框图。
如图8所示，根据本实施例的均流控制装置可以包括采样模块 10、转换模块20、校准模块30和控制模块40。
采样模块10构造为获取功率电路的电流采样信号。
转换模块20构造为将采样信号转换为数字信号。
校准模块30构造诶对数字信号进行校准，以得到采样信号与输出电流之间的对应关系。
控制模块40构造诶根据所述对应关系对至少一个电源模块进行均流控制。
根据本公开的实施例，通过对采样信号进行转换校准，获得采样信号与输出电流之间的对应关系，可以消除各个采样电路之间的差异对并联电源模块的均流控制造成的偏差，提高了电源模块的均流效果，进而提高了系统的可靠性。
图9为图8所示的均流控制装置中控制模块40的示意性结构框图。
如图9所示，在本实施例中，控制模块40包括采样单元41、计算单元42、比较单元43和调节单元44。
采样单元41构造为获取均流母线的电压信号。
计算单元42构造为根据对应关系得到电源模块的计算输出信号。
比较单元43构造为对电源模块的计算输出信号与均流母线的电压进行比较。比较单元43可以实现为图2所示的第二模数转换单元AD2。作为另一种实施例，比较单元43也可以通过如图5所示的比较器实现。
调节单元44构造为：当电源模块的计算输出信号与均流母线的电压之差大于第一阈值时，减小电源模块用于输出电压的基准值；当电源模块的计算输出信号与均流母线的电压之差小于第二阈值时，增大电源模块用于输出电压的基准值；并且当电源模块的计算输出信号与均流母线的电压之差小于或等于第一阈值并且大于或等于第二阈值时，不对电源模块用于输出电压的基准值进行调节。
调节单元44构造为：当电源模块的计算输出信号与均流母线的电压之差大于第一阈值时，减小电源模块用于输出电压的基准值；当电源模块的计算输出信号与均流母线的电压之差小于第二阈值时，增 大电源模块用于输出电压的基准值；并且当电源模块的计算输出信号和均流母线的电压之差小于或等于第一阈值并且大于或等于第二阈值时，不对电源模块用于输出电压的基准值进行调节。
图10为图8所示的均流控制装置中校准模块30的示意性结构框图。
如图10所示，在本实施例中，校准模块30可以包括线性校准单元31、二次函数校准单元32、分段线性校准单元33和自定义校准单元34中的至少之一。
线性校准单元31构造为采用两点法对数字信号进行校准，以得到采样信号与输出电流之间的线性关系；
二次函数校准单元32构造为采用二次曲线拟合方法对数字信号进行校准，以得到采样信号与输出电流之间的函数关系。
分段线性校准单元33构造为采用分段线性法对数字信号进行校准，以得到采样信号与输出电流之间的分段线性关系。
自定义校准单元34构造为对数字信号进行校准，以得到采样信号与输出电流之间的自定义函数关系。
上面已经对各种校准方式进行了详细描述，在此不再赘述。
本公开实施例还提供一种电子设备，包括存储器和处理器，在所述存储器中存储有至少一个由所述处理器执行的计算机程序，所述处理器执行所述计算机程序时，所述处理器执行根据本公开各实施例的均流控制方法。
本公开实施例还提供一种计算机可读存储介质，其上存储有计算机程序，该计算机程序在被处理器执行时执行根据本公开各实施例的均流控制方法。
根据本公开各实施例的均流控制方法、装置、设备及计算机可读存储介质，通过对采样信号进行转换校准，获得采样信号与输出电流之间的对应关系，可以消除各个采样电路之间的差异对并联电源模块的均流控制造成的偏差，提高了电源模块的均流效果，进而提高了系统的可靠性。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了 解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件来实现。基于这样的理解，本公开的技术方案可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘、FLASH等)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，空调器，或者网络设备等)执行本公开各个实施例所述的方法。
以上参照附图说明了本公开的实施例，并非因此局限本公开的权利范围。本领域技术人员不脱离本公开的范围和实质内所作的任何修改、等同替换和改进，均应在本公开的权利范围之内。

Claims (10)

  1. 一种均流控制方法，包括：
    获取功率电路的采样信号；
    将所述采样信号转换为数字信号；
    对所述数字信号进行校准，以得到所述采样信号与输出电流之间的对应关系；以及
    根据所述对应关系对至少一个电源模块进行均流控制。
  2. 根据权利要求1所述的均流控制方法，其中，所述至少一个电源模块通过均流母线电阻与均流母线连接，并且根据所述对应关系对至少一个电源模块进行均流控制的步骤包括：
    获取均流母线的电压信号；
    根据所述对应关系得到所述电源模块的计算输出信号；
    对所述电源模块的计算输出信号与均流母线的电压进行比较；以及
    当所述电源模块的计算输出信号与所述均流母线的电压之差大于第一阈值时，减小所述电源模块用于输出电压的基准值；
    当所述电源模块的计算输出信号与所述均流母线的电压之差小于第二阈值时，增大所述电源模块用于输出电压的基准值；并且
    当所述电源模块的计算输出信号与所述均流母线的电压之差小于或等于第一阈值并且大于或等于第二阈值时，不对所述电源模块用于输出电压的基准值进行调节。
  3. 根据权利要求2所述的均流控制方法，其中，对所述数字信号进行校准，以得到所述采样信号与输出电流之间的对应关系的步骤包括下列之一：
    采用两点法对所述数字信号进行校准，以得到所述采样信号与输出电流之间的线性关系；
    采用二次曲线拟合方法对所述数字信号进行校准，以得到所述 采样信号与输出电流之间的二次函数关系；
    采用分段线性法对所述数字信号进行校准，以得到所述采样信号与输出电流之间的分段线性关系；以及
    对所述数字信号进行校准，以得到所述采样信号与输出电流之间的自定义函数关系。
  4. 根据权利要求2所述的均流控制方法，其中，所述均流母线电阻设置于所述电源模块内或外接于所述电源模块。
  5. 一种均流控制装置，包括：
    采样模块，其构造为获取功率电路的采样信号；
    转换模块，其构造为将所述采样信号转换为数字信号；
    校准模块，其构造为对所述数字信号进行校准，以得到所述采样信号与输出电流之间的对应关系；以及
    控制模块，其构造为根据所述对应关系对至少一个电源模块进行均流控制。
  6. 根据权利要求5所述的均流控制装置，其中，所述至少一个电源模块通过均流母线电阻与均流母线连接，并且所述控制模块包括：
    采样单元，其构造为获取均流母线的电压信号；
    计算单元，其构造为根据所述对应关系得到所述电源模块的计算输出信号；
    比较单元，其构造为对所述电源模块的计算输出信号与均流母线的电压进行比较；以及
    调节单元，其构造为：
    当所述电源模块的计算输出信号与所述均流母线的电压之差大于第一阈值时，减小所述电源模块用于输出电压的基准值；
    当所述电源模块的计算输出信号与所述均流母线的电压之差小于第二阈值时，增大所述电源模块用于输出电压的基准值；并且
    当所述电源模块的计算输出信号与所述均流母线的电压之差小 于或等于第一阈值并且大于或等于第二阈值时，不对所述电源模块用于输出电压的基准值进行调节。
  7. 根据权利要求6所述的均流控制装置，其中，所述校准模块包括下列中的至少之一：
    线性校准单元，其构造为采用两点法对所述数字信号进行校准，以得到所述采样信号与输出电流之间的线性关系；
    二次函数校准单元，其构造为采用二次曲线拟合方法对所述数字信号进行校准，以得到所述采样信号与输出电流之间的二次函数关系；
    分段线性校准单元，其构造为采用分段线性法对所述数字信号进行校准，以得到所述采样信号与输出电流之间的分段线性关系；以及
    自定义校准单元，其构造为对所述数字信号进行校准，以得到所述采样信号与输出电流之间的自定义函数关系。
  8. 根据权利要求6所述的均流控制装置，其中，所述均流母线电阻设置于所述电源模块内或外接于所述电源模块。
  9. 一种电子设备，包括存储器和处理器，在所述存储器中存储有由所述处理器执行的至少一个计算机程序，所述处理器在执行所述计算机程序时执行根据权利要求1至4中任一项所述的均流控制方法。
  10. 一种计算机可读存储介质，其上存储有计算机程序，该计算机程序在被处理器执行时执行根据权利要求1至4中任一所述的均流控制方法。
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