CN113824324B - Power supply device with improved current balancing adjustment accuracy - Google Patents
Power supply device with improved current balancing adjustment accuracy Download PDFInfo
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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
- 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
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Abstract
Description
技术领域Technical Field
一种电源供应装置，尤指一种提升均流调校精准度的电源供应装置。A power supply device, in particular, a power supply device with improved current sharing adjustment accuracy.
背景技术Background Art
目前市面上应用于高端服务器的冗余电源供应系统中的电源供应装置，在多台电源供应装置并联供负载输出时须能够稳定的均流输出。请参阅图6所示，其中一种常用的均流技术为自动主仆式均流法(Automatic Mater Method)，即令系统设置有一均流汇流排71及一负载输出埠72，且多台电源供应装置60分别设置有一额外的均流电压输出端VLSI，以在该均流汇流排71上分享代表该电源供应装置60输出电流的一输出电流信号。且负载输出端72供连接一负载，提供稳定的均流输出。进一步的，每一电源供应装置60采用均流汇流排71上最大输出电流的输出电流信号做为比较基准，使得各该电源供应装置60根据该最大输出电流信号与本身的输出电流信号比较，决定是否须调整输出电流。The power supply devices currently used in the redundant power supply system of high-end servers on the market must be able to output stable current sharing when multiple power supply devices are connected in parallel to supply load output. Please refer to Figure 6, one of the commonly used current sharing technologies is the automatic master-slave current sharing method (Automatic Master Method), that is, the system is provided with a current sharing bus 71 and a load output port 72, and multiple power supply devices 60 are respectively provided with an additional current sharing voltage output terminal VLSI to share an output current signal representing the output current of the power supply device 60 on the current sharing bus 71. And the load output terminal 72 is used to connect a load to provide a stable current sharing output. Furthermore, each power supply device 60 uses the output current signal of the maximum output current on the current sharing bus 71 as a comparison benchmark, so that each power supply device 60 compares the maximum output current signal with its own output current signal to determine whether the output current needs to be adjusted.
其中，该输出电流信号是由电源供应装置60内的一电流取样单元61取样电源供应模组62输出的输出电流以产生对应的取样电压，再通过内部放大一定比例至所需的电压范围产生的。然而，由电流取样单元61取样电压至通过放大器放大的各个阶段皆会出现误差。例如，取样电阻因其极低阻值的特性误差约为0.5％～1％，放大器亦有75uV～1000uV的输入偏移误差，假设该放大器的放大倍率为481倍，则输出误差为36mV～481mV。综上，造成该输出电流信号高达约6.9％的误差。该误差直接影响了各台电源供应装置60的均流误差度，也限制该电源供应系统可容许输出的最大功率值。Among them, the output current signal is generated by a current sampling unit 61 in the power supply device 60 sampling the output current output by the power supply module 62 to generate a corresponding sampling voltage, and then amplified internally by a certain proportion to the required voltage range. However, errors will occur in each stage from the sampling voltage of the current sampling unit 61 to the amplification by the amplifier. For example, the sampling resistor has a characteristic error of about 0.5% to 1% due to its extremely low resistance value, and the amplifier also has an input offset error of 75uV to 1000uV. Assuming that the amplifier has an amplification factor of 481 times, the output error is 36mV to 481mV. In summary, the output current signal has an error of up to about 6.9%. This error directly affects the current sharing error of each power supply device 60, and also limits the maximum power value that the power supply system can allow to output.
目前修正输出电流信号的常见方法例如有：1.在放大器电路中增加可变电阻以人工进行放大倍率调校，缺点为人工调校的成本效率问题及可变电阻的可信度问题；2.使用双极性接面电晶体(Bipolar Junction Transistor；BJT)或金属氧化物半导体场效电晶体(Metal-Oxide-Semiconductor Field-Effect Transistor；MOSFET)作为可变电阻调整放大器的放大倍率，虽然不须人工调校，但BJT及MOSFET接容易受温度变化影响，导致不同温度下的额外误差结果；3.取样电路改为使用数位方式以脉冲宽度调制信号进行取样电压的输入以克服类比电路的误差问题，缺点为脉冲宽度调制信号由内部脉冲宽度调制电路进行调变及稳压，会产生相位延迟而无法即时反应电流变化。Common methods for correcting output current signals include: 1. adding a variable resistor to the amplifier circuit to manually adjust the gain, but the disadvantages are the cost efficiency of manual adjustment and the reliability of the variable resistor; 2. using a bipolar junction transistor (BJT) or a metal-oxide-semiconductor field-effect transistor (MOSFET) as a variable resistor to adjust the amplifier gain. Although manual adjustment is not required, BJT and MOSFET are easily affected by temperature changes, resulting in additional error results at different temperatures; 3. the sampling circuit is changed to use a digital method to input a pulse width modulation signal to sample the voltage to overcome the error problem of the analog circuit. The disadvantage is that the pulse width modulation signal is modulated and stabilized by the internal pulse width modulation circuit, which will produce a phase delay and cannot immediately respond to current changes.
综上所述，现有的应用自动主仆式均流法的冗余电源供应系统中用于调校电流取样电压的各种方式仍有效率及可信度、温度影响误差、相位延迟等问题，因此现有技术的冗余电源供应装置流技术仍需进一步改善。In summary, various methods for adjusting current sampling voltage in the existing redundant power supply system using automatic master-slave current balancing method still have problems such as efficiency and reliability, temperature influence error, phase delay, etc. Therefore, the redundant power supply device current technology of the existing technology still needs to be further improved.
发明内容Summary of the invention
有鉴于现有的并连输出电源供应装置的均流信号容易因电流取样的误差导致均流输出的不稳定或偏差而失去均流的目的，本发明提供一种提升均流调校精准度的电源供应装置，包含：In view of the fact that the current sharing signal of the existing parallel output power supply device is easily unstable or deviated due to the error of current sampling, thus losing the purpose of current sharing, the present invention provides a power supply device with improved current sharing adjustment accuracy, including:
一电源供应模组，电连接一负载输出端并输出一输出电流；a power supply module electrically connected to a load output terminal and outputting an output current;
一电流取样单元，电连接该负载输出端以检测该输出电流并据以产生一取样电压，该电流取样单元并具有一取样电压输出端以输出该取样电压；a current sampling unit electrically connected to the load output terminal to detect the output current and generate a sampling voltage accordingly, and the current sampling unit has a sampling voltage output terminal to output the sampling voltage;
一比较器单元，具有一正输入端、一负输入端及一均流电压输出端，其中该正输入端通过一分压单元电连接该取样电压输出端，该负输入端通端通过一负回授单元电连接该均流电压输出端，且该均流电压输出端电连接一均流汇流排；A comparator unit having a positive input terminal, a negative input terminal and a current-sharing voltage output terminal, wherein the positive input terminal is electrically connected to the sampling voltage output terminal through a voltage divider unit, the negative input terminal is electrically connected to the current-sharing voltage output terminal through a negative feedback unit, and the current-sharing voltage output terminal is electrically connected to a current-sharing bus;
一电流镜单元，具有一第一端及一第二端，该第一端电连接该取样电压输出端，该第二端电连接该比较器单元的正输入端；a current mirror unit having a first end and a second end, the first end being electrically connected to the sampling voltage output end, and the second end being electrically connected to the positive input end of the comparator unit;
一电压补偿单元，电连接该电流镜单元的第一端并提供一补偿电压。A voltage compensation unit is electrically connected to the first end of the current mirror unit and provides a compensation voltage.
该电流取样单元根据该电源供应装置的输出电流产生对应比例的取样电压，该取样电压与该补偿电压共同输入至该电流镜单元第一端以产生一校正取样电压。该校正取样电压进入该电流镜单元的第一端的电流则等比例地映射至该电流镜单元的第二端，也就是该比较器单元的正输入端。而该负输入端则经由该负回授单元电连接该均流电压输出端，使得该均流电压输出端输出一根据该负回授即该校正取样电压经一定比例放大产生的均流电压，该均流电压则输出至该均流汇流排，提供与其他电源供应装置并联输出时做为输出电流信号的参考比较电压。The current sampling unit generates a sampling voltage of a corresponding proportion according to the output current of the power supply device, and the sampling voltage and the compensation voltage are inputted into the first end of the current mirror unit together to generate a correction sampling voltage. The current of the correction sampling voltage entering the first end of the current mirror unit is proportionally mapped to the second end of the current mirror unit, that is, the positive input end of the comparator unit. The negative input end is electrically connected to the current-sharing voltage output end through the negative feedback unit, so that the current-sharing voltage output end outputs a current-sharing voltage generated by amplifying the correction sampling voltage by a certain proportion according to the negative feedback, and the current-sharing voltage is outputted to the current-sharing bus to provide a reference comparison voltage for the output current signal when outputting in parallel with other power supply devices.
通过在该电流镜单元的第一端提供补偿电压的方式将经校正的取样电压以一定比例映射至比较器单元的正输入端，该补偿电压在输出较接近满载时，使得校正取样电压极趋近对应输出电流的取样电压的理想值，确保该电源供应装置在高负载时的均流电压准确；在输出为低负载时，该补偿电压对该校正取样电压的补偿作用较小，该校正取样电压趋近实际的取样电压，因此降低产生对取样电压直接补偿一直流电压，造成低负载时均流电压产生偏移量的问题。The corrected sampling voltage is mapped to the positive input terminal of the comparator unit in a certain proportion by providing a compensation voltage at the first terminal of the current mirror unit. When the output is close to full load, the compensation voltage makes the corrected sampling voltage extremely close to the ideal value of the sampling voltage corresponding to the output current, thereby ensuring that the current-sharing voltage of the power supply device is accurate when the load is high; when the output is low load, the compensation effect of the compensation voltage on the corrected sampling voltage is small, and the corrected sampling voltage is close to the actual sampling voltage, thereby reducing the problem of direct compensation of the sampling voltage with a DC voltage, which causes the current-sharing voltage to generate an offset when the load is low.
此外，由于电流镜单元的特性，由该电流镜单元的第二端流入的电流完全等同于该校正取样电压对于电流镜单元第一端的阻抗产生的电流，该电流镜单元的第一端及第二端的电流比例并不受温度变化影响，因此即使温度变化亦不会使得均流电压相对输出电流的准确度发生偏移。In addition, due to the characteristics of the current mirror unit, the current flowing into the second end of the current mirror unit is completely equal to the current generated by the impedance of the correction sampling voltage to the first end of the current mirror unit, and the current ratio between the first end and the second end of the current mirror unit is not affected by temperature changes. Therefore, even if the temperature changes, the accuracy of the current sharing voltage relative to the output current will not be offset.
综上所述，本发明的提升均流调校精准度的电源供应装置提供对输出电流取样电压的一调校机制，同时克服了现有技术中多种取样电压调校机制的缺点，在该电源供应装置高负载时提供符合电路误差的电压补偿值，使得最后输出的均流电压准确反应实际输出电流量，确保高负载时的输出功率及效率。In summary, the power supply device of the present invention for improving the accuracy of current sharing adjustment provides a adjustment mechanism for the output current sampling voltage, while overcoming the shortcomings of various sampling voltage adjustment mechanisms in the prior art. When the power supply device is under high load, a voltage compensation value that conforms to the circuit error is provided, so that the final output current sharing voltage accurately reflects the actual output current, thereby ensuring the output power and efficiency under high load.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
图1是本发明提升均流调校精准度的电源供应装置的电路方块示意图。FIG. 1 is a circuit block diagram of a power supply device for improving the current sharing adjustment accuracy of the present invention.
图2是本发明提升均流调校精准度的电源供应装置第一较佳实施例的电路方块示意图。FIG. 2 is a circuit block diagram of a first preferred embodiment of a power supply device for improving current sharing adjustment accuracy according to the present invention.
图3是本发明提升均流调校精准度的电源供应装置第二较佳实施例的电路方块示意图。FIG. 3 is a circuit block diagram of a second preferred embodiment of a power supply device for improving current sharing adjustment accuracy according to the present invention.
图4是本发明提升均流调校精准度的电源供应装置第三较佳实施例的电路方块示意图。FIG. 4 is a circuit block diagram of a third preferred embodiment of a power supply device for improving current sharing adjustment accuracy according to the present invention.
图5是本发明提升均流调校精准度的电源供应装置的负载与均流电压关系图。FIG. 5 is a diagram showing the relationship between the load and the current sharing voltage of the power supply device for improving the current sharing adjustment accuracy of the present invention.
图6是现有技术中并联冗余均流电源供应系统的电路方块示意图。FIG. 6 is a circuit block diagram of a parallel redundant current-sharing power supply system in the prior art.
具体实施方式DETAILED DESCRIPTION
请参阅图1所示，本发明提升均流调校精准度的电源供应装置包含一电源供应模组11、一电流取样单元12、一比较器单元13、一电流镜单元14及一电压补偿单元15。该电源供应模组11电连接一负载输出端Vo以输出一输出电流，该负载输出端Vo用于与另一或多个电源供应装置并联输出。该电流取样单元12电连接该负载输出端Vo，检测该输出电流并据以产生一取样电压，且由一取样电压输出端VIO输出该取样电压。该比较器单元13具有一正输入端+、一负输入端-及一均流电压输出端VLSI，其中该正输入端通过一分压单元16电连接该取样电压输出端，该负输入端通过一负回授单元17电连接该均流电压输出端VLSI，该均流电压输出端VLSI用于电连接一均流汇流排20，该均流汇流排20是用于连接另一或多个电源供应装置的均流电压输出端VLSI。Please refer to FIG. 1 , the power supply device for improving the accuracy of current equalization adjustment of the present invention comprises a power supply module 11, a current sampling unit 12, a comparator unit 13, a current mirror unit 14 and a voltage compensation unit 15. The power supply module 11 is electrically connected to a load output terminal Vo to output an output current, and the load output terminal Vo is used to output in parallel with another or more power supply devices. The current sampling unit 12 is electrically connected to the load output terminal Vo, detects the output current and generates a sampling voltage accordingly, and outputs the sampling voltage from a sampling voltage output terminal V IO . The comparator unit 13 has a positive input terminal +, a negative input terminal - and a current-sharing voltage output terminal VLSI, wherein the positive input terminal is electrically connected to the sampling voltage output terminal via a voltage divider unit 16, and the negative input terminal is electrically connected to the current-sharing voltage output terminal VLSI via a negative feedback unit 17. The current-sharing voltage output terminal VLSI is used to electrically connect to a current-sharing bus 20, and the current-sharing bus 20 is used to connect to the current-sharing voltage output terminal VLSI of another or multiple power supply devices.
本实施例中，该分压单元16包含一第一电阻R1及一第二电阻R2，该第一电阻R1电连接于该取样电压输出端VIO及该比较器单元13的正输入端+之间，该第二电阻R2电连接于该比较器单元13的正输入端+及一接地端之间。该比较器单元13通过负回授控制输出该均流电压，该负回授单元17包含一第三电阻R3及一第四电阻R4，该第三电阻R3电连接于该比较器单元13的负输入端及均流电压输出端VLSI之间，该第四电阻R4电连接于该比较器单元13的负输入端-及接地端之间。In this embodiment, the voltage divider unit 16 includes a first resistor R1 and a second resistor R2, the first resistor R1 is electrically connected between the sampling voltage output terminal V IO and the positive input terminal + of the comparator unit 13, and the second resistor R2 is electrically connected between the positive input terminal + of the comparator unit 13 and a ground terminal. The comparator unit 13 outputs the current-sharing voltage through negative feedback control, and the negative feedback unit 17 includes a third resistor R3 and a fourth resistor R4, the third resistor R3 is electrically connected between the negative input terminal of the comparator unit 13 and the current-sharing voltage output terminal VLSI, and the fourth resistor R4 is electrically connected between the negative input terminal - of the comparator unit 13 and the ground terminal.
该电流镜单元14具有一第一端N1及一第二端N2，该第一端N1电连接该取样电压输出端VIO，该第二端N2电连接该比较器单元13的正输入端+。该电压补偿单元15电连接该电流镜单元14的第一端N1并提供一补偿电压。The current mirror unit 14 has a first terminal N1 and a second terminal N2. The first terminal N1 is electrically connected to the sampling voltage output terminal V IO , and the second terminal N2 is electrically connected to the positive input terminal + of the comparator unit 13. The voltage compensation unit 15 is electrically connected to the first terminal N1 of the current mirror unit 14 and provides a compensation voltage.
请参阅图2所示，其中，较佳的，该电压补偿单元15提供的补偿电压是由一脉冲宽度调制信号经滤波后形成的直流电压。举例而言，该电压补偿单元15包含有一脉冲宽度调制输入端PWM及一低通滤波器151。该脉冲宽度调制输入端PWM接收该脉冲宽度调制信号，并经由该低通滤波器151滤波产生该直流的补偿电压。因此，该补偿电压可经由控制该脉冲宽度调制信号的占空比进行微调校正。该脉冲宽度调制信号可以是来自电源供应模组11的一数字信号处理器，例如该电源供应模组11的一一次侧控制器112或一二次侧控制器113。Please refer to FIG. 2 , wherein preferably, the compensation voltage provided by the voltage compensation unit 15 is a DC voltage formed by filtering a pulse width modulation signal. For example, the voltage compensation unit 15 includes a pulse width modulation input terminal PWM and a low-pass filter 151. The pulse width modulation input terminal PWM receives the pulse width modulation signal and generates the DC compensation voltage through filtering by the low-pass filter 151. Therefore, the compensation voltage can be fine-tuned and calibrated by controlling the duty cycle of the pulse width modulation signal. The pulse width modulation signal can be from a digital signal processor of the power supply module 11, such as a primary side controller 112 or a secondary side controller 113 of the power supply module 11.
在本实施例中，该来自数字信号处理器提供的脉冲宽度调制信号是用于提供经系统设计且初次校验后设定为固定值的该补偿电压，并非用于提供检测输出电流量的时变信号。即当该电源供应装置在运作时，该脉冲宽度调制信号为的占空比固定，不须依时变的输出电流进行调整以反应电流量，因此不会产生相位延迟的问题，解决过去由脉冲宽度调制信号传递输出电流信号产生的电流量反应延迟问题。In this embodiment, the pulse width modulation signal provided by the digital signal processor is used to provide the compensation voltage that is designed by the system and set to a fixed value after the initial verification, and is not used to provide a time-varying signal for detecting the output current. That is, when the power supply device is in operation, the duty cycle of the pulse width modulation signal is fixed, and it is not necessary to adjust according to the time-varying output current to reflect the current, so there will be no phase delay problem, solving the current response delay problem caused by the output current signal transmitted by the pulse width modulation signal in the past.
再请参阅图2所示，在本较佳实施例中，该比较器单元13包含一放大器op及一二极体D1，该二极体D1电连接于该放大器op的输出端及该均流电压输出端VLSI之间。Please refer to FIG. 2 again. In the preferred embodiment, the comparator unit 13 includes an amplifier op and a diode D1. The diode D1 is electrically connected between the output terminal of the amplifier op and the current-sharing voltage output terminal VLSI.
请参阅图2所示，在本较佳实施例中，该电流镜单元14为一标准电流镜单元14；除此以外。请参阅图3所示，该电流镜单元14可以是一威尔森电流镜(Wilson CurrentMirror)单元；也可以如图4所示，该电流镜单元14是一威德勒电流镜(Widlar CurrentMirror)单元。Please refer to FIG. 2 , in the preferred embodiment, the current mirror unit 14 is a standard current mirror unit 14 ; otherwise, please refer to FIG. 3 , the current mirror unit 14 may be a Wilson current mirror unit; or as shown in FIG. 4 , the current mirror unit 14 may be a Widlar current mirror unit.
请参阅图5是本发明提升均流校正精准度的电源供应装置的负载与均流电压关系图。其中，理想曲线为负载程度与该均流电压成正比。举例而言，该电源供应装置的满载输出电流为8A(100％)，该均流电压为4V；当所需输出负载为4A(50％)时，该均流电压应为2V，负载程度与均流电压的关系如图中曲线S1所示；在该电流取样单元12及比较器单元13等电路有误差的情形下，负载程度与均流电压的关系产生一正偏移或一负偏移，例如图中曲线S2、S3所示；而本发明的电源供应装置的经校正补偿的该均流电压与负载关系如曲线S4、S5所示，在接近100％负载输出时，该均流电压趋近理想曲线，提供高负载时准确反应输出电流的均流电压，确保整体电源供应系统在高负载时极低误差的均流调校。Please refer to FIG. 5 for a diagram showing the relationship between the load and the current-sharing voltage of the power supply device of the present invention for improving the accuracy of current-sharing correction. The ideal curve is that the load level is proportional to the current-sharing voltage. For example, the full-load output current of the power supply device is 8A (100%), and the current-sharing voltage is 4V; when the required output load is 4A (50%), the current-sharing voltage should be 2V, and the relationship between the load level and the current-sharing voltage is shown as curve S1 in the figure; in the case where there are errors in the circuits such as the current sampling unit 12 and the comparator unit 13, the relationship between the load level and the current-sharing voltage produces a positive offset or a negative offset, such as shown by curves S2 and S3 in the figure; and the relationship between the current-sharing voltage and the load after correction and compensation of the power supply device of the present invention is shown as curves S4 and S5. When the load output is close to 100%, the current-sharing voltage approaches the ideal curve, providing a current-sharing voltage that accurately reflects the output current at high load, ensuring that the overall power supply system has extremely low error current-sharing adjustment at high load.
再请参阅图2所示，在本较佳实施例中，该电源供应模组11包含一电源转换单元111、一一次侧控制器112、一二次侧控制器113。其中，该二次侧控制器113电连接该比较器单元13的正输出端+及该负输入端-，以接收该正输入端的取样电压及负输入端的均流电压。当比较器单元13的该负输入端-的电压高于该正输入端+，该二次侧控制器113偕同该一次侧控制器112调控该电源供应模组11提高输出电流。Please refer to FIG. 2 again. In the preferred embodiment, the power supply module 11 includes a power conversion unit 111, a primary side controller 112, and a secondary side controller 113. The secondary side controller 113 is electrically connected to the positive output terminal + and the negative input terminal - of the comparator unit 13 to receive the sampling voltage of the positive input terminal and the current sharing voltage of the negative input terminal. When the voltage of the negative input terminal - of the comparator unit 13 is higher than the positive input terminal +, the secondary side controller 113 and the primary side controller 112 regulate the power supply module 11 to increase the output current.
该比较器单元13的正输入端用于接收该经电流镜单元14及电压补偿单元15校正后的校正取样电压，且经由负回授控制的比较器单元13产生该均流电压。当该电源供应装置与另一并联输出的电源供应装置均供输出时，该均流电压输出端VLSI共接于该均流汇流排20。当二电源供应装置达到平衡均流输出时，该比较器单元13的正输入端+及负输入端-的电压趋近相等，即该均流汇流排20上二台电源供应装置提供的均流电压相等；当其中一台电源供应装置的输出电流高于另一台电源供应装置的输出电流，均流汇流排20上的均流电压被该较高输出电流的电源供应装置的均流电压拉高，较低输出电流的电源供应装置的该比较器单元13的负回授平衡被破坏，比较器单元13的负输入端-的电压高于该正输入端+的校正取样电压，此时该二次侧控制器113根据负输入端-的电压高于该正输入端的情形，判断该均流汇流排20上有另一台电源供应装置的输出电流高于自身的输出电流，因此控制该电源供应模组11提高输出电流，直到该比较器单元13再次达到负回授平衡，完成均流的目的。The positive input terminal of the comparator unit 13 is used to receive the calibration sampling voltage calibrated by the current mirror unit 14 and the voltage compensation unit 15, and the current sharing voltage is generated by the negative feedback controlled comparator unit 13. When the power supply device and another parallel output power supply device are both output, the current sharing voltage output terminal VLSI is connected to the current sharing bus 20. When the two power supply devices achieve balanced current output, the voltages at the positive input terminal + and the negative input terminal - of the comparator unit 13 approach to be equal, that is, the current-sharing voltages provided by the two power supply devices on the current-sharing bus 20 are equal; when the output current of one of the power supply devices is higher than the output current of the other power supply device, the current-sharing voltage on the current-sharing bus 20 is pulled up by the current-sharing voltage of the power supply device with the higher output current, and the negative feedback balance of the comparator unit 13 of the power supply device with the lower output current is destroyed, and the voltage at the negative input terminal - of the comparator unit 13 is higher than the calibrated sampling voltage of the positive input terminal +. At this time, the secondary-side controller 113 determines that the output current of another power supply device on the current-sharing bus 20 is higher than its own output current based on the fact that the voltage at the negative input terminal - is higher than the positive input terminal, and therefore controls the power supply module 11 to increase the output current until the comparator unit 13 reaches negative feedback balance again to achieve the purpose of current balancing.
以上所述仅是本发明的较佳实施例而已，并非对本发明做任何形式上的限制，虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明，任何本领域技术人员，在不脱离本发明技术方案的范围内，当可利用上述揭示的技术内容做出些许更动或修饰为等同变化的等效实施例，但凡是未脱离本发明技术方案的内容，依据本发明的技术实质对以上实施例所作的任何简单修改、等同变化与修饰，均仍属于本发明技术方案的范围内。The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.
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