CN102222905B - Plug-in multi-passage current sharing interface circuit - Google Patents
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Abstract
一种插入式多通道均流接口电路，包括由多个主回路通道并联组成的主回路，每个所述主回路通道上均连接有控制其工作状态的均流控制电路，所述主回路通道包括输入电容，所述输入电容与并联直流电源模块输出电压并联，所述N-MOS管的漏极同时与并联直流电源模块输出电压的正端、辅助电容和辅助电阻并联支路的一端相连，所述辅助电容和辅助电阻并联支路的另一端与辅助二极管的阳极连接，所述辅助二极管的阴极同时与所述N-MOS管的源极、电感的一端相连，所述电感的另一端同时与输出电容的一端、输出电压的正端相连，所述输出电容的另一端同时与并联直流电源模块输出电压的负端、输出电压的负端相连；所述输出电压的两端并联有负载电阻。
A plug-in multi-channel current sharing interface circuit, including a main circuit composed of multiple main circuit channels connected in parallel, each of the main circuit channels is connected with a current sharing control circuit for controlling its working state, and the main circuit channel It includes an input capacitor, the input capacitor is connected in parallel with the output voltage of the parallel DC power supply module, and the drain of the N-MOS transistor is simultaneously connected with the positive terminal of the output voltage of the parallel DC power supply module, the auxiliary capacitor and one end of the parallel branch of the auxiliary resistor, The other end of the parallel branch of the auxiliary capacitor and the auxiliary resistor is connected to the anode of the auxiliary diode, and the cathode of the auxiliary diode is connected to the source of the N-MOS transistor and one end of the inductor at the same time, and the other end of the inductor is simultaneously It is connected to one end of the output capacitor and the positive end of the output voltage, and the other end of the output capacitor is connected to the negative end of the output voltage of the parallel DC power supply module and the negative end of the output voltage at the same time; the two ends of the output voltage are connected in parallel with a load resistor .
Description
技术领域 technical field
本发明涉及一种插入式多通道均流接口电路。The invention relates to a plug-in multi-channel current sharing interface circuit.
背景技术 Background technique
并联直流电源系统由多个直流电源模块组成，因其稳定性、可靠性高，容量扩展方便灵活，使用场合不受限制等优点，目前已广泛使用于通信、计算机、电力等领域。但是直流电源模块即使是同种规格也会因为元器件容差及老化等原因造成彼此间输出特性的不一致。这种不一致性会造成并联直流电源系统的不均衡现象，即输出电压较高的直流电源模块会承担较大的输出电流，输出电压较低的直流电源模块则承担较小的输出电流。严重情况下，这种不均衡现象将会危及到整个并联直流电源系统的安全运行。因此，并联直流电源系统中各个直流电源模块间的均流问题是最需要解决的。由此，均流技术应运而生。插入式均流技术就是其中的一种，即在并联直流电源模块和负载之间插入均流接口电路，由该均流接口电路来解决不同直流电源模块间的电流均衡问题，好处是可降低整个系统对并联直流电源模块的一致性要求，实现低成本和高灵活性。The parallel DC power supply system is composed of multiple DC power supply modules. Because of its high stability and reliability, convenient and flexible capacity expansion, and unlimited use occasions, it has been widely used in communication, computer, electric power and other fields. However, even if the DC power modules are of the same specification, the output characteristics will be inconsistent with each other due to component tolerances and aging. This inconsistency will cause an unbalanced phenomenon in the parallel DC power system, that is, the DC power module with a higher output voltage will bear a larger output current, and the DC power module with a lower output voltage will bear a smaller output current. In severe cases, this unbalanced phenomenon will endanger the safe operation of the entire parallel DC power system. Therefore, the current sharing problem among the various DC power modules in the parallel DC power system needs to be solved most. As a result, current sharing technology came into being. Plug-in current sharing technology is one of them, that is, a current sharing interface circuit is inserted between the parallel DC power supply module and the load, and the current sharing interface circuit solves the problem of current balance between different DC power supply modules. The system requires consistency of parallel DC power modules to achieve low cost and high flexibility.
图1所示的是现有的一种插入式多通道均流接口电路。它由功率主回路和控制回路2部分组成。主回路结构非常简单，由n个相同的通道组成，每个通道又主要由输入电容Cij，N-MOS管Sj和电感Lj组成(j＝1...n，下同)。并联直流电源模块输出电压Vij与Cij并联，Sj的源极与Vij的正端相连，Sj的漏极与Lj的一端相连，Lj的另一端同时与输出电容Co的一端及输出电压Vo的正端相连，Co的另一端同时与Vij的负端及Vo的负端相连，负载电阻R1并联于Vo两端。控制回路由n个相同的均流控制电路组成，分别和对应的主回路通道相连。均流控制电路j有6个外接端口，其中的5个端口Vij，vsj，vgj，vsenj，和Gndj分别与主回路通道j的Vij正端，Sj源极，Sj门极，电感电流检测端口vsenj，和Vij负端相连，另1个端口vcsbusj则接于均流控制总线vcsbus上。均流控制电路j通过均流控制总线获得均流信息vcsbus，根据均流信息vcsbus和主回路通道j的电感电流信息vsenj，采用特定的均流算法，输出MOS管差分驱动信号vgj和vsj，控制主回路通道中MOS管Sj的工作状态(或导通或截止)，调节流过电感Lj的电流iLj，从而实现各个并联直流电源模块输出电流的均衡。但是由于主回路中MOS管Sj体二极管导通压降的影响，令并联直流电源模块输出电压可允许的不一致性受到限制，因此该插入式多通道均流接口电路较适合于低压的并联直流电源系统。Figure 1 shows an existing plug-in multi-channel current sharing interface circuit. It consists of two parts, the power main loop and the control loop. The structure of the main loop is very simple, consisting of n identical channels, and each channel is mainly composed of an input capacitor Cij, an N-MOS transistor Sj and an inductor Lj (j=1...n, the same below). The output voltage Vij of the parallel DC power supply module is connected in parallel with Cij, the source of Sj is connected to the positive terminal of Vij, the drain of Sj is connected to one end of Lj, and the other end of Lj is connected to one end of the output capacitor Co and the positive end of the output voltage Vo The other end of Co is connected to the negative end of Vij and the negative end of Vo at the same time, and the load resistor R1 is connected in parallel to both ends of Vo. The control loop is composed of n identical current sharing control circuits, which are respectively connected to corresponding main loop channels. The current sharing control circuit j has 6 external ports, of which 5 ports Vij, vsj, vgj, vsenj, and Gndj are respectively connected to the positive end of Vij, the source of Sj, the gate of Sj, and the inductor current detection port vsenj of the main circuit channel j , connected to the negative end of Vij, and the other port vcsbusj is connected to the current equalizing control bus vcsbus. The current sharing control circuit j obtains the current sharing information vcsbus through the current sharing control bus. According to the current sharing information vcsbus and the inductor current information vsenj of the main circuit channel j, it adopts a specific current sharing algorithm to output the MOS tube differential drive signals vgj and vsj to control The working state (or on or off) of the MOS transistor Sj in the main loop channel adjusts the current iLj flowing through the inductor Lj, so as to realize the balance of the output current of each parallel DC power supply module. However, due to the influence of the conduction voltage drop of the body diode of the MOS transistor Sj in the main circuit, the allowable inconsistency of the output voltage of the parallel DC power supply module is limited, so this plug-in multi-channel current sharing interface circuit is more suitable for low-voltage parallel DC power supplies system.
发明内容 Contents of the invention
本发明要解决现有插入式多通道均流接口电路适用的并联直流电源系统电压等级范围窄的问题，提供了一种适用于高压的并联直流电源系统的插入式多通道均流接口电路。The invention solves the problem that the parallel DC power supply system applicable to the existing plug-in multi-channel current sharing interface circuit has a narrow voltage range, and provides a plug-in multi-channel current sharing interface circuit suitable for high-voltage parallel DC power supply systems.
本发明的技术方案：Technical scheme of the present invention:
一种插入式多通道均流接口电路，包括主回路，所述主回路由多个主回路通道并联组成，每个所述主回路通道上均连接有控制其工作状态的均流控制电路，其特征在于：所述主回路通道包括输入电容、N-MOS管、辅助电容、辅助电阻、辅助二极管、电感、输出电容，所述输入电容与并联直流电源模块输出电压并联，所述N-MOS管的漏极同时与并联直流电源模块输出电压的正端、辅助电容和辅助电阻并联支路的一端相连，所述辅助电容和辅助电阻并联支路的另一端与辅助二极管的阳极连接，所述辅助二极管的阴极同时与所述N-MOS管的源极、电感的一端相连，所述电感的另一端同时与输出电容的一端、输出电压的正端相连，所述输出电容的另一端同时与并联直流电源模块输出电压的负端、输出电压的负端相连；所述输出电压的两端并联有负载电阻；A plug-in multi-channel current sharing interface circuit, including a main circuit, the main circuit is composed of a plurality of main circuit channels connected in parallel, each of the main circuit channels is connected with a current sharing control circuit to control its working state, its The feature is that: the main loop channel includes an input capacitor, an N-MOS tube, an auxiliary capacitor, an auxiliary resistor, an auxiliary diode, an inductor, and an output capacitor, the input capacitor is connected in parallel with the output voltage of the parallel DC power supply module, and the N-MOS tube At the same time, the drain of the parallel DC power supply module is connected to the positive terminal of the output voltage of the parallel DC power supply module, one end of the parallel branch of the auxiliary capacitor and the auxiliary resistor, and the other end of the parallel branch of the auxiliary capacitor and the auxiliary resistor is connected to the anode of the auxiliary diode. The cathode of the diode is connected to the source of the N-MOS tube and one end of the inductor at the same time, the other end of the inductor is connected to one end of the output capacitor and the positive end of the output voltage at the same time, and the other end of the output capacitor is connected in parallel to The negative terminal of the output voltage of the DC power supply module is connected to the negative terminal of the output voltage; a load resistor is connected in parallel at both ends of the output voltage;
所述主回路通道的并联直流电源模块输出电压正端、N-MOS管的源极、N-MOS管的门极、电感电流的检测端口、并联直流电源模块输出电压负端分别与均流控制电路上相应的外接端口相连，所述均流控制电路还设有一个与均流控制总线连接的外接端口。The positive terminal of the output voltage of the parallel DC power supply module, the source of the N-MOS transistor, the gate of the N-MOS transistor, the detection port of the inductor current, and the negative terminal of the output voltage of the parallel DC power supply module of the main loop channel are respectively connected with the current sharing control The corresponding external ports on the circuit are connected, and the current sharing control circuit is also provided with an external port connected to the current sharing control bus.
进一步，所述均流控制电路包括辅助电源、电流检测电路、电流控制电路、电流编程电路、MOS管驱动电路，Further, the current sharing control circuit includes an auxiliary power supply, a current detection circuit, a current control circuit, a current programming circuit, and a MOS transistor drive circuit,
所述辅助电源用于提供均流控制电路其余部分工作所需的各种直流电源电压和基准电压，根据实际需要可对并联直流电源模块输出电压进行升压或降压的变换处理；The auxiliary power supply is used to provide various DC power supply voltages and reference voltages required for the rest of the current sharing control circuit, and can perform step-up or step-down conversion processing on the output voltage of the parallel DC power supply modules according to actual needs;
所述电流检测电路用于接收已转换成电压信号的主回路通道的电感电流信息并作适当处理，再把电流检测结果输送给电流编程电路和电流控制电路；The current detection circuit is used to receive the inductance current information of the main loop channel that has been converted into a voltage signal and perform appropriate processing, and then transmit the current detection result to the current programming circuit and the current control circuit;
所述电流编程电路用于通过均流算法从均流控制总线获得均流信息产生电流控制电路所需的参考电压并将该参考电压发送给电流控制电路；The current programming circuit is used to obtain current sharing information from the current sharing control bus through a current sharing algorithm to generate a reference voltage required by the current control circuit and send the reference voltage to the current control circuit;
所述电流控制电路用于将接收到的电流检测结果与参考电压进行比较，给出MOS管开或关的驱动指令，并将该驱动指令发送给MOS管驱动电路；The current control circuit is used to compare the received current detection result with a reference voltage, give a drive command for turning on or off the MOS tube, and send the drive command to the MOS tube drive circuit;
所述MOS管驱动电路用于执行电流控制电路的MOS管驱动指令，控制MOS管的工作状态。The MOS transistor driving circuit is used to execute the MOS transistor driving instruction of the current control circuit to control the working state of the MOS transistor.
本发明的技术构思为：为消除主回路通道中N-MOS管的体二极管影响，采用辅助电容、辅助电阻及辅助二极管的串并联支路与N-MOS管漏源极并联的结构代替原有的单个MOS管，且调整N-MOS管漏源极与并联直流电源模块输出电压和电感的接法，即N-MOS管的漏极同时与并联直流电源模块输出电压的正端及辅助电容和辅助电阻并联支路的一端相连，辅助电容和辅助电阻并联支路的另一端与辅助二极管的阳极相连，辅助二极管的阴极同时与N-MOS管的源极及电感的一端相连。在多个均流控制电路的合作控制下，插入式多通道均流接口电路的主回路能帮助多个输出特性不一致的并联直流电源模块实现输出电流均衡。The technical idea of the present invention is: in order to eliminate the influence of the body diode of the N-MOS transistor in the main loop channel, the structure of the series-parallel connection of the auxiliary capacitor, the auxiliary resistor and the auxiliary diode and the parallel connection of the drain and source of the N-MOS transistor is used to replace the original structure. A single MOS transistor, and adjust the connection between the drain and source of the N-MOS transistor and the output voltage and inductance of the parallel DC power module, that is, the drain of the N-MOS transistor is simultaneously connected to the positive terminal of the output voltage of the parallel DC power module and the auxiliary capacitor and One end of the parallel branch of the auxiliary resistor is connected, the other end of the auxiliary capacitor and the parallel branch of the auxiliary resistor are connected to the anode of the auxiliary diode, and the cathode of the auxiliary diode is connected to the source of the N-MOS transistor and one end of the inductor. Under the cooperative control of multiple current sharing control circuits, the main circuit of the plug-in multi-channel current sharing interface circuit can help multiple parallel DC power modules with inconsistent output characteristics to achieve output current balance.
需特别说明的是，该插入式多通道均流接口电路中的MOS管除了可以是N-MOS管还可以是P-MOS管，MOS管的位置除了可以位于高端还可以位于低端，辅助电容和辅助电阻的并联支路与辅助二极管的位置可互换。It should be noted that the MOS tube in the plug-in multi-channel current sharing interface circuit can be N-MOS tube or P-MOS tube. The parallel branch of the auxiliary resistor and the auxiliary diode can be interchanged.
本发明的有益效果主要表现在：拓宽了插入式多通道均流接口电路的适用范围，不但适合低压的并联直流电源系统，而且还适合高压的并联直流电源系统，能为多个输出特性不一致的并联直流电源模块或并联太阳能电池组或并联蓄电池组等提供低成本、高灵活性的均流方案。The beneficial effects of the present invention are mainly manifested in that the scope of application of the plug-in multi-channel current sharing interface circuit is broadened, it is not only suitable for low-voltage parallel DC power supply systems, but also suitable for high-voltage parallel Parallel connection of DC power modules or parallel connection of solar battery packs or parallel connection of storage battery packs provides a low-cost, high-flexibility current sharing solution.
附图说明 Description of drawings
图1是现有的一种插入式多通道均流接口电路图。FIG. 1 is a circuit diagram of an existing plug-in multi-channel current sharing interface.
图2是本发明的电路图。Fig. 2 is a circuit diagram of the present invention.
图3是本发明的一种均流控制电路内部结构框图。Fig. 3 is a block diagram of the internal structure of a current sharing control circuit of the present invention.
图4是本发明的一种具体实施例的一个主回路通道和均流控制电路的电路图。Fig. 4 is a circuit diagram of a main loop channel and a current sharing control circuit of a specific embodiment of the present invention.
图5是当Vi1＜Vik(k＝2...n)时，本发明的一种具体实施例的理想工作波形图。Fig. 5 is an ideal working waveform diagram of a specific embodiment of the present invention when Vi1<Vik (k=2...n).
具体实施方式 Detailed ways
参照图2、图3，一种插入式多通道均流接口电路，包括主回路，所述主回路由多个主回路通道并联组成，每个所述主回路通道上均连接有控制其工作状态的均流控制电路，所述主回路通道包括输入电容Cij、N-MOS管Sj、辅助电容Caj、辅助电阻Raj、辅助二极管Daj、电感Lj、输出电容Co(j＝1...n，下同)，所述输入电容Cij与并联直流电源模块输出电压Vij并联，所述N-MOS管Sj的漏极同时与并联直流电源模块输出电压Vij的正端、辅助电容Caj和辅助电阻Raj并联支路的一端相连，所述辅助电容Caj和辅助电阻Raj并联支路的另一端与辅助二极管Daj的阳极连接，所述辅助二极管Daj的阴极同时与所述N-MOS管Sj的源极、电感Lj的一端相连，所述电感Lj的另一端同时与输出电容Co的一端、输出电压Vo的正端相连，所述输出电容Co的另一端同时与并联直流电源模块输出电压Vij的负端、输出电压Vo的负端相连；所述输出电压Vo的两端并联有负载电阻R1；Referring to Figure 2 and Figure 3, a plug-in multi-channel current sharing interface circuit includes a main circuit, the main circuit is composed of a plurality of main circuit channels connected in parallel, each of the main circuit channels is connected with a A current sharing control circuit, the main loop channel includes an input capacitor Cij, an N-MOS transistor Sj, an auxiliary capacitor Caj, an auxiliary resistor Raj, an auxiliary diode Daj, an inductor Lj, and an output capacitor Co (j=1...n, below same), the input capacitor Cij is connected in parallel with the output voltage Vij of the parallel DC power supply module, and the drain of the N-MOS transistor Sj is connected in parallel with the positive terminal of the output voltage Vij of the parallel DC power supply module, the auxiliary capacitor Caj and the auxiliary resistor Raj. One end of the circuit is connected, and the other end of the parallel branch of the auxiliary capacitor Caj and the auxiliary resistor Raj is connected to the anode of the auxiliary diode Daj, and the cathode of the auxiliary diode Daj is connected to the source of the N-MOS transistor Sj and the inductor Lj at the same time. The other end of the inductance Lj is connected to one end of the output capacitor Co and the positive end of the output voltage Vo at the same time, and the other end of the output capacitor Co is simultaneously connected to the negative end of the output voltage Vij of the parallel DC power supply module, the output voltage The negative terminals of Vo are connected; the two ends of the output voltage Vo are connected in parallel with a load resistor R1;
所述主回路通道的并联直流电源模块输出电压Vij正端、N-MOS管Sj的源极、N-MOS管Sj的门极、电感Lj电流iLj的检测端口、并联直流电源模块输出电压Vij负端分别与均流控制电路上相应的外接端口相连，所述均流控制电路还设有一个与均流控制总线vcsbus连接的外接端口vcsbusj。The positive end of the output voltage Vij of the parallel DC power supply module of the main loop channel, the source of the N-MOS transistor Sj, the gate of the N-MOS transistor Sj, the detection port of the inductor Lj current iLj, the negative terminal of the output voltage Vij of the parallel DC power supply module The terminals are respectively connected to the corresponding external ports on the current sharing control circuit, and the current sharing control circuit is also provided with an external port vcsbusj connected to the current sharing control bus vcsbus.
所述均流控制电路包括辅助电源、电流检测电路、电流控制电路、电流编程电路、MOS管驱动电路，The current sharing control circuit includes an auxiliary power supply, a current detection circuit, a current control circuit, a current programming circuit, and a MOS transistor drive circuit,
所述辅助电源用于提供均流控制电路的其余部分工作所需的各种直流电源电压和基准电压，根据实际需要可对并联直流电源模块输出电压Vij进行升压或降压的变换处理；The auxiliary power supply is used to provide various DC power supply voltages and reference voltages required for the rest of the current sharing control circuit, and can perform step-up or step-down conversion processing on the output voltage Vij of the parallel DC power supply module according to actual needs;
所述电流检测电路用于接收已转换成电压信号的主回路通道的电感Lj电流iLj信息并作适当处理，再把电流iLj检测结果输送给电流编程电路和电流控制电路；The current detection circuit is used to receive the inductance Lj current iLj information of the main loop channel that has been converted into a voltage signal and perform appropriate processing, and then deliver the current iLj detection result to the current programming circuit and the current control circuit;
所述电流编程电路用于通过均流算法从均流控制总线vcsbus获得均流信息产生电流控制电路所需的参考电压并将该参考电压发送给电流控制电路；The current programming circuit is used to obtain current sharing information from the current sharing control bus vcsbus through a current sharing algorithm to generate a reference voltage required by the current control circuit and send the reference voltage to the current control circuit;
所述电流控制电路用于将接收到的电流iLj检测结果与参考电压进行比较，给出MOS管开或关的驱动指令，并将该驱动指令发送给MOS管驱动电路；The current control circuit is used to compare the detection result of the received current iLj with the reference voltage, give a drive command for turning on or off the MOS tube, and send the drive command to the MOS tube drive circuit;
所述MOS管驱动电路用于执行电流控制电路的MOS管驱动指令，控制MOS管Sj的工作状态。The MOS transistor driving circuit is used to execute the MOS transistor driving instruction of the current control circuit to control the working state of the MOS transistor Sj.
图4显示了本发明的一种具体实施例的主回路通道j和均流控制电路j的部分(j＝1...n，下同)。主回路通道j采用串联电阻Rsenj来检测电感电流iLj，获得电压vsenj。图4所示的主回路通道j中，并联直流电源模块输出电压Vij与输入电容Cij并联，N-MOS管Sj的漏极同时与Vij的正端及辅助电容Caj和辅助电阻Raj并联支路的一端相连，Caj和Raj并联支路的另一端与Daj的阳极相连，Daj的阴极同时与Sj的源极及电感Lj的一端相连，Lj的另一端同时与输出电容Co的一端及输出电压Vo的正端相连，Co的另一端同时与Vo的负端及检测电阻Rsenj的一端相连，Rsenj的另一端与Vij的负端相连，负载电阻R1并联于Vo两端。主回路通道j中引出5个外接端口Vij(即Vij正端)、vgj(即Sj门极)、vsj(即Sj源极)、vsenj(即电感电流iLj的检测端口)、Gndj(即Vij负端)，分别与均流控制电路j的5个同名外接端口一一匹配。图4所示的均流控制电路j由辅助电源j、电流检测电路j、电流编程电路j、电流控制电路j、MOS管驱动电路j这5个部分组成。辅助电源j把并联直流电源模块输出电压Vij转换成Vccj和Vddj以满足均流控制电路j的其余部分的供电需要，Vccj给电流检测电路j、电流编程电路j、电流控制电路j供电，Vddj给MOS管驱动电路j供电，产生电流编程电路j所需的基准电压Vref1j和Vref2j(Vref1j＞Vcref2j)。电流检测电路j由运算放大器U1j、电阻Rc1j和Rc2j、电容Cc1j组成。主回路通道j的vsenj接口与U1j的正相输入端相连，Rc1j的一端与U1j的输出端相连，Rc1j的另一端同时与U1j的反相输入端、Rc2j和Cc1j并联支路的一端相连，Rc2j和Cc1j并联支路的另一端与主回路通道j的Gndj接口相连，U1j输出电压vcsenj。电流编程电路j采用最小主从模式产生电流控制电路j所需的参考电压vcsref1j和vcsref2j，由运算放大器U2j、U3j、U4j，二极管Dcsenj，电阻Rcsenj、Rcs1j、Rcs2j、Rcs3j、Rcs4j、Rcs5j、Rcs6j、Rcs7j、Rcs8j，电容Ccs1j、Ccs2j组成。U2j的正相输入端即均流控制器j的外接端口vcsbusj(接于均流控制总线vcsbus上)同时与Dcsenj的阳极、Rcsenj的一端及均流控制总线接口vcsbusj相连，Dcsenj的阴极与电流检测电路j输出vcsenj相连，Rcsenj的另一端与辅助电源j输出Vccj相连。U2j的负相输入端同时与U2j的输出端、Rcs1j的一端及Rcs5j的一端相连。Rcs1j的另一端同时与U3j的正相输入端及Rcs2j的一端相连，Rcs2j的另一端与辅助电源j输出Vref1j相连。Rcs4j的一端与U3j的输出vcsref1j相连，Rcs4j的另一端同时与U3j的负相输入端及Ccs1j和Rcs3j并联支路的一端相连，Ccs1j和Rcs3j并联支路的另一端与主回路通道j的外接端口Gndj相连。Rcs5j的另一端同时与U4j的正相输入端及Rcs6j的一端相连，Rcs6j的另一端与辅助电源j输出Vref2j相连。Rcs8j的一端与U4j的输出vcsref2j相连，Rcs8j的另一端同时与U4j的负相输入端及Ccs2j和Rcs7j并联支路的一端相连，Ccs2j和Rcs7j并联支路的另一端与主回路通道j的外接端口Gndj相连。电流控制电路j采用滞环比较控制方法，由比较器U5j和U6j、RS触发器U7j组成。电流检测电路j的输出vcsenj同时接于U5j的正相输入端和U6j的反相输入端，由电流编程电路j输出的参考电压vcsref1j接于U5j的反相输入端，参考电压vcsref2j接于U6j的正相输入端。U5j的输出端接于U7j的清零输入端R(高电平有效)，U6j的输出端接于U7j的置位输入端S(高电平有效)。由U7j的正相输出端Q输出控制MOS管Sj的开关指令vgsj。MOS管驱动电路j是一个满足Sj驱动要求的电平转换电路，U7j的输出vgsj经电平转换电路j的电平转换，输出1对逻辑关系与vgsj一致的差分驱动信号分别与主回路通道j中的vgj和vsj接点相连。Fig. 4 shows a part of the main circuit channel j and the current sharing control circuit j (j=1...n, the same below) of a specific embodiment of the present invention. The main loop channel j uses a series resistor Rsenj to detect the inductor current iLj to obtain the voltage vsenj. In the main circuit channel j shown in Figure 4, the output voltage Vij of the parallel DC power supply module is connected in parallel with the input capacitor Cij, and the drain of the N-MOS transistor Sj is simultaneously connected with the positive terminal of Vij, the auxiliary capacitor Caj and the auxiliary resistor Raj. One end is connected, the other end of the parallel branch of Caj and Raj is connected to the anode of Daj, the cathode of Daj is connected to the source of Sj and one end of the inductor Lj at the same time, and the other end of Lj is connected to one end of the output capacitor Co and the output voltage Vo The positive end is connected, the other end of Co is connected to the negative end of Vo and one end of the detection resistor Rsenj at the same time, the other end of Rsenj is connected to the negative end of Vij, and the load resistor R1 is connected in parallel to both ends of Vo. There are five external ports Vij (i.e. the positive terminal of Vij), vgj (i.e. the gate of Sj), vsj (i.e. the source of Sj), vsenj (i.e. the detection port of the inductor current iLj) and Gndj (i.e. the negative terminal), respectively matching with the five external ports of the same name of the current sharing control circuit j one by one. The current sharing control circuit j shown in FIG. 4 is composed of five parts: an auxiliary power supply j, a current detection circuit j, a current programming circuit j, a current control circuit j, and a MOS transistor drive circuit j. The auxiliary power supply j converts the output voltage Vij of the parallel DC power supply module into Vccj and Vddj to meet the power supply needs of the rest of the current sharing control circuit j, Vccj supplies power to the current detection circuit j, current programming circuit j, and current control circuit j, and Vddj supplies power to The MOS tube drive circuit j supplies power to generate the reference voltages Vref1j and Vref2j required by the current programming circuit j (Vref1j>Vcref2j). The current detection circuit j is composed of an operational amplifier U1j, resistors Rc1j and Rc2j, and a capacitor Cc1j. The vsenj interface of channel j of the main circuit is connected to the non-inverting input of U1j, one end of Rc1j is connected to the output of U1j, the other end of Rc1j is connected to the inverting input of U1j, and one end of the parallel branch of Rc2j and Cc1j, Rc2j The other end of the branch connected in parallel with Cc1j is connected to the Gndj interface of channel j of the main circuit, and U1j outputs voltage vcsenj. The current programming circuit j adopts the minimum master-slave mode to generate the reference voltages vcsref1j and vcsref2j required by the current control circuit j, which are composed of operational amplifiers U2j, U3j, U4j, diodes Dcsenj, resistors Rcsenj, Rcs1j, Rcs2j, Rcs3j, Rcs4j, Rcs5j, Rcs6j, Rcs7j, Rcs8j, capacitance Ccs1j, Ccs2j composition. The positive phase input terminal of U2j is the external port vcsbusj of the current equalizing controller j (connected to the current equalizing control bus vcsbus) at the same time connected to the anode of Dcsenj, one end of Rcsenj and the interface vcsbusj of the current equalizing control bus, and the cathode of Dcsenj is connected to the current detection The output of circuit j is connected to vcsenj, and the other end of Rcsenj is connected to output Vccj of auxiliary power supply j. The negative phase input end of U2j is connected with the output end of U2j, one end of Rcs1j and one end of Rcs5j at the same time. The other end of Rcs1j is connected with the non-inverting input end of U3j and one end of Rcs2j at the same time, and the other end of Rcs2j is connected with auxiliary power supply j output Vref1j. One end of Rcs4j is connected to the output vcsref1j of U3j, the other end of Rcs4j is connected to the negative phase input end of U3j and one end of the parallel branch of Ccs1j and Rcs3j, and the other end of the parallel branch of Ccs1j and Rcs3j is connected to the external port of channel j of the main circuit Gndj is connected. The other end of Rcs5j is connected with the non-inverting input end of U4j and one end of Rcs6j at the same time, and the other end of Rcs6j is connected with auxiliary power supply j output Vref2j. One end of Rcs8j is connected to the output vcsref2j of U4j, the other end of Rcs8j is connected to the negative phase input end of U4j and one end of the parallel branch of Ccs2j and Rcs7j, and the other end of the parallel branch of Ccs2j and Rcs7j is connected to the external port of channel j of the main circuit Gndj is connected. The current control circuit j adopts the hysteresis comparison control method, which is composed of comparators U5j and U6j, and RS flip-flop U7j. The output vcsenj of the current detection circuit j is connected to the non-inverting input terminal of U5j and the inverting input terminal of U6j at the same time, the reference voltage vcsref1j output by the current programming circuit j is connected to the inverting input terminal of U5j, and the reference voltage vcsref2j is connected to the inverting input terminal of U6j Non-inverting input. The output terminal of U5j is connected to the reset input terminal R of U7j (active high), and the output terminal of U6j is connected to the set input terminal S of U7j (active high). The switching instruction vgsj for controlling the MOS transistor Sj is output from the non-inverting output terminal Q of U7j. The MOS tube drive circuit j is a level conversion circuit that meets the driving requirements of Sj. The output vgsj of U7j is level converted by the level conversion circuit j, and
图4所示电路的工作原理大致如下：The working principle of the circuit shown in Figure 4 is roughly as follows:
假设有n个并联直流电源模块，其输出电压分别为Vi1至Vin，其中以Vi1最小，即Vi1＜Vik(k＝2...n，下同)。在最小主从模式及滞环电流控制下，主回路通道1将作为主模式，即N-MOS管S1将一直导通，输出电压Vo≈Vi1。而主回路通道k将作为从模式，即N-MOS管Sk将周期性地导通和关断，调节iLk与iL1保持基本一致，实现均流。具体过程如下：由于Vi1最小，导致在负载电流分配中iL1最小，相应的vcsen1也最小，因此均流控制总线上的电压vcsbus≈vcsen1(即最小主从模式)。合理设计均流控制电路j中的Rcs1j、Rcs2j、Rcs3j、Rcs4j、Rcs5j、Rcs6j、Rcs7j、Rcs8j等参数，可令参考电压vcsref1j＝vcsbus+Vref1j、vcsref2j＝vcsbus+Vref2j，其中Vref1j＞Vref2j(j＝1...n)。由于vcsen1＜vcsref21，vgs1将一直为高电平，使主回路通道1中的S1一直导通。对于主回路通道k，当vcsenk＞vcsref1k时，均流控制电路k驱动Sk截止，主回路通道k中Vik、Cak、Rak、Dak、Lk、Co、R1及Rsenk形成回路，Cak充电，电感Lk两端电压vLk≈Vik-vcak-Vi1＜0(vcaj为辅助电容Cak两端电压)，Lk放电，iLk减小，vcsenk随之减小。当vcsenk＜vcsref2k时，均流控制电路k驱动Sk导通，主回路通道k中Vik、Sk、Lk、Co、R1及Rsenk形成回路，Cak和Rak形成另一个回路，Cak通过Rak放电，电感Lk两端电压vLk≈Vik-Vi1＞0，Lk充电，iLk增加，vcsenk随之增加直至vcsenk＞vcsref1k，Sk将再次被截止，主回路通道k进入下一个循环周期。采用滞环电流控制方法，iLk的变化被限定在一个区间内，始终与iL1保持基本一致。当Cak足够大时可近似认为vcak恒定。Rak的作用是吸收多余能量，使Cak两端电压vcak维持在一定水平。上述电路各主要理想工作波形如图5所示。Assume that there are n parallel DC power supply modules, the output voltages of which are respectively Vi1 to Vin, wherein Vi1 is the smallest, that is, Vi1<Vik (k=2...n, the same below). Under the minimum master-slave mode and hysteresis current control, the
本说明书实施例所述的内容仅仅是对发明构思的实现形式的列举，本发明的保护范围不应当被视为仅限于实施例所陈述的具体形式，本发明的保护范围也及于本领域技术人员根据本发明构思所能够想到的等同技术手段。The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. Equivalent technical means that a person can think of based on the concept of the present invention.
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| CN103515949B (en) * | 2013-08-28 | 2015-08-05 | 浙江工业大学 | Formula current sharing interface circuit can be presented containing coupling inductance |
| CN103500995B (en) * | 2013-08-28 | 2015-08-05 | 浙江工业大学 | Formula current sharing interface circuit can be presented containing three winding coupling inductance |
| CN103515948B (en) * | 2013-08-28 | 2015-08-05 | 浙江工业大学 | A kind of containing coupling inductance can present formula current sharing interface circuit |
| CN103500994B (en) * | 2013-08-28 | 2015-08-05 | 浙江工业大学 | The current sharing interface circuit of excess energy feedback output |
| CN103500993B (en) * | 2013-08-28 | 2015-08-05 | 浙江工业大学 | A kind of current sharing interface circuit of excess energy feedback output |
| CN104166449A (en) * | 2014-06-30 | 2014-11-26 | 浪潮(北京)电子信息产业有限公司 | Multiple power source parallel operation device and method |
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