WO2011063685A1

WO2011063685A1 - Totem-pole bridgeless circuit system and current sampling device

Info

Publication number: WO2011063685A1
Application number: PCT/CN2010/077646
Authority: WO
Inventors: 陈文彬; 周岿; 田帆
Original assignee: 华为技术有限公司
Priority date: 2009-11-26
Filing date: 2010-10-11
Publication date: 2011-06-03
Also published as: CN101707441A; CN101707441B

Abstract

A totem-pole bridgeless circuit system and a current sampling device. The system includes a first bridge arm unit, a second bridge arm unit and a switch control unit (30). The second bridge arm unit includes a first switch tube (211) and a second switch tube (220), and a first current sampling unit (210) and a second current sampling unit (221). The switch control unit (30) controls closing or breaking of the first switch tube (211) and the second switch tube (220) respectively according to currents sampled by the first current sampling unit (210) and the second current sampling unit (221). The system can reduce difficulty for controlling the switch tubes and increase the utilization rate of the system.

Description

图腾柱无桥电路***及电流采样装置技术领域 Totem pole bridgeless circuit system and current sampling device

本发明涉及供电技术领域，特别涉及图腾柱无桥电路***及电流采样装置。背景技术 The invention relates to the technical field of power supply, in particular to a totem pole bridgeless circuit system and a current sampling device. Background technique

在供电***中，电源的转换效率是重要的，现有技术中的电源高效转换 ***有无桥功率因数矫正（PFC ) 电路***和谐振电路（LLC ) ***等。而图腾柱无桥升压变换电路***（以下简称图腾柱无桥电路***）是无桥 PFC电路 ***的一种，如图 1所示，在图腾柱无桥升压变换电路***中：第一桥臂单元、第二桥臂单元和电容 C之间相互并联连接，且连接的一端接地；第一桥臂单元中有两个同向串联的二极管 D1和 D2; 第二桥臂单元中有两个同向串联的开关管 S 1和 S2；在两个二极管的连接点与两个开关管的连接点之间连接有电源 AC 和电感 L。 In the power supply system, the conversion efficiency of the power supply is important. The prior art power efficient conversion system has a bridge power factor correction (PFC) circuit system and a resonant circuit (LLC) system. The totem pole bridgeless boost converter circuit system (hereinafter referred to as the totem pole bridgeless circuit system) is a type of bridgeless PFC circuit system, as shown in Figure 1, in the totem pole bridgeless boost converter circuit system: The bridge arm unit, the second bridge arm unit and the capacitor C are connected in parallel with each other, and one end of the connection is grounded; the first bridge arm unit has two diodes D1 and D2 connected in series in the same direction; two of the second bridge arm unit The switching tubes S 1 and S2 are connected in series in the same direction; a power source AC and an inductor L are connected between the connection point of the two diodes and the connection point of the two switching tubes.

上述图腾柱无桥电路***中，当电源 AC输入的为交流电的正半周时，闭合开关管 S2、断开开关管 Sl，这时电感开关管 S2、二极管 D2构成储能回路，当对电感 L的储能完成后，闭合开关管 Sl、断开开关管 S2，这时电感开关管 Sl、二极管 D2构成续流回路，释放电感 L上的能量；当电源 AC输入的为交流电的负半周时，闭合开关管 Sl、断开开关管 S2，这时二极管 Dl、开关管 Sl、电感 L构成储能回路，当对电感 L的储能完成后，闭合开关管 S2、断开开关管 Sl，这时二极管 Dl、开关管 S2、电感 L构成续流回路，释放电感 L上的匕里。 In the above-mentioned totem pole bridgeless circuit system, when the power supply AC input is the positive half cycle of the alternating current, the switch tube S2 is closed, and the switch tube S1 is opened. At this time, the inductor switch tube S2 and the diode D2 constitute an energy storage loop, when the inductor L is After the energy storage is completed, the switch S1 is closed and the switch S2 is opened. At this time, the inductive switch S1 and the diode D2 form a freewheeling circuit to release the energy on the inductor L; when the power AC input is the negative half cycle of the alternating current, Close the switch S1 and open the switch S2. At this time, the diode D1, the switch S1 and the inductor L form an energy storage circuit. When the energy storage for the inductor L is completed, the switch S2 is closed and the switch S1 is opened. The diode D1, the switch tube S2, and the inductor L form a freewheeling circuit, which releases the turns on the inductor L.

在上述现有技术进行实践和研究的过程中，本发明的发明人发现：现有的图腾柱变换电路***中，需要控制开关管 S1和 S2的时序，满足上述的对应关系，图腾柱无桥电路***才能进行正常运行，而该***中对开关管的控制较难。发明内容 In the process of practicing and researching the above prior art, the inventors of the present invention found that: in the existing totem pole conversion circuit system, it is necessary to control the timing of the switch tubes S1 and S2 to satisfy the above corresponding relationship, and the totem pole has no bridge. The circuit system can be operated normally, and the control of the switch tube in the system is difficult. Summary of the invention

本发明实施例提供图腾柱无桥电路***及采样电路***，降低图腾柱无桥电路***中对开关管闭合与断开的控制难度，从而提高了图腾柱无桥电路 ***的利用率。 The embodiment of the invention provides a totem pole bridgeless circuit system and a sampling circuit system, which reduces the difficulty of controlling the closing and opening of the switch tube in the totem pole bridgeless circuit system, thereby improving the utilization rate of the totem pole bridgeless circuit system.

本发明实施例提供一种图腾柱无桥电路***，包括：并联连接于第一并联连接点和第二并联连接点之间的第一桥臂单元和第二桥臂单元，所述第一桥臂单元中包括同向串联的第一二极管和第二二极管；所述第二桥臂单元中包括同向串联的第一开关管和第二开关管；在所述两个二极管间的第一连接点与所述两个开关管间的第二连接点之间连接有电源和电感，所述***还包括开关控制单元，且所述第二桥臂单元还包括： An embodiment of the present invention provides a totem pole bridgeless circuit system, including: a first bridge arm unit and a second bridge arm unit connected in parallel between a first parallel connection point and a second parallel connection point, the first bridge The arm unit includes a first diode and a second diode connected in series in the same direction; the second bridge arm unit includes a first switch tube and a second switch tube connected in series in the same direction; between the two diodes A power source and an inductor are connected between the first connection point and the second connection point between the two switch tubes, the system further includes a switch control unit, and the second bridge arm unit further includes:

两个电流采样单元，其中第一电流采样单元与所述两个开关管中的第一开关管串联于所述第一并联连接点和第二连接点之间；第二电流采样单元与所述两个开关管中的第二开关管串联于所述第二并联连接点和第二连接点之间； Two current sampling units, wherein the first current sampling unit and the first one of the two switching tubes are connected in series between the first parallel connection point and the second connection point; the second current sampling unit and the a second switch tube of the two switch tubes is connected in series between the second parallel connection point and the second connection point;

所述第一电流采样单元，用于当所述第一开关管闭合时，采集流过所述第一开关管的电流；当所述第一开关管断开时，释放所述第一电流采样单元采集的能量； The first current sampling unit is configured to collect a current flowing through the first switch tube when the first switch tube is closed, and release the first current sample when the first switch tube is turned off The energy collected by the unit;

所以第二电流采样单元，用于当所述第二开关管闭合时，采集流过所述第二开关管的电流；当所述第二开关管断开时，释放所述第二电流采样单元采集的能量； Therefore, the second current sampling unit is configured to collect a current flowing through the second switching tube when the second switching tube is closed; and release the second current sampling unit when the second switching tube is disconnected Energy collected;

所述开关控制单元，与所述两个电流采样单元及第一开关管和第二开关管连接，用于根据所述第一电流采样单元与所述第二电流采样单元采集的电流，控制所述第一开关管和所述第二开关管的闭合或断开。 The switch control unit is connected to the two current sampling units and the first switch tube and the second switch tube, and is configured to control the current according to the current collected by the first current sampling unit and the second current sampling unit. The first switch tube and the second switch tube are closed or opened.

本发明实施例提供一种电流采样装置，包括： The embodiment of the invention provides a current sampling device, including:

电流互感器，两个稳压二极管、四个二极体、采样开关管和采样电阻，所述电流互感器包括原边绕阻和副边绕阻；其中： a current transformer, two Zener diodes, four diodes, a sampling switch tube and a sampling resistor, the current transformer comprising a primary winding and a secondary winding; wherein:

两个所述二极体同极串联成第一采样桥；另两个所述二极体同极串联成第二采样桥，所述第一采样桥和第二采样桥中，其中一个采样桥包括的二极体是同阳极相连，另一个采样桥包括的二极体是同阴极相连；且所述第一采样桥与第二采样桥分别与所述副边绕组的两端并联连接； Two of the diodes are connected in series to form a first sampling bridge; the other two of the diodes are connected in series to form a second sampling bridge, and one of the first sampling bridge and the second sampling bridge, one sampling bridge The included diode is connected to the anode, and the other sampling bridge includes a diode connected to the cathode; and the first The sample bridge and the second sampling bridge are respectively connected in parallel with both ends of the secondary winding;

同极串联的所述两个稳压二极管的另两个端点分别与所述副边绕阻的两端连接； The other two ends of the two Zener diodes connected in series with the same pole are respectively connected to the two ends of the secondary winding;

所述原边绕阻的两端与被采样电路连接； Both ends of the primary winding are connected to the sampling circuit;

所述第一采样桥中两个二极体的同极连接点与所述第二采样桥中两个二极体的同极连接点之间连接有呈串联连接的所述采样开关管和采样电阻。 Connecting the sampling switch tube and sampling connected in series between the same pole connection point of two diodes in the first sampling bridge and the same pole connection point of two diodes in the second sampling bridge resistance.

电流互感器，两个稳压二极管、两个二极体、采样开关管和采样电阻；所述电流互感器包括原边绕阻和连接于绕阻端点的两个副边绕阻； a current transformer, two Zener diodes, two diodes, a sampling switch tube and a sampling resistor; the current transformer includes a primary winding and two secondary windings connected to the winding end;

所述电流互感器的原边绕阻与被采样电路连接； The primary side winding of the current transformer is connected to the sampled circuit;

所述两个副边绕阻中的第一副边绕阻的绕阻端点和另一端点之间，有呈串联连接的所述采样电阻、所述采样开关管及一个二极体；所述两个副边绕阻的两个非绕阻端点之间，有呈同极串联连接的两个所述二极体，且并联有呈同极串联连接的所述两个稳压二极管。 Between the winding end of the first secondary winding of the two secondary windings and the other end, the sampling resistor, the sampling switch tube and a diode are connected in series; Between the two non-restricted end points of the two secondary windings, there are two diodes connected in series in the same polarity, and the two Zener diodes connected in series in the same polarity are connected in parallel.

可见本发明实施例的图腾柱无桥电路***中，包括开关控制单元，且在第二桥臂单元中增加了两个电流采样单元，所述开关控制单元通过第一电流采样单元和第二电流采样单元采集的电流，分别控制第二桥臂单元中的第一开关管和第二开关管的闭合或断开，和现有技术中图腾柱无桥电路***相比，本发明实施例的***能通过电流采样单元采集的电流来控制开关管的断开或闭合，降低了图腾柱无桥电路***中对开关管控制的难度，提高了图腾柱无桥电路***的利用率。附图说明 It can be seen that the totem pole bridgeless circuit system in the embodiment of the present invention includes a switch control unit, and two current sampling units are added in the second bridge arm unit, and the switch control unit passes the first current sampling unit and the second current The current collected by the sampling unit controls the closing or opening of the first switching tube and the second switching tube in the second bridge arm unit respectively, compared with the totem pole bridgeless circuit system in the prior art, the system of the embodiment of the invention The current collected by the current sampling unit can be used to control the opening or closing of the switch tube, which reduces the difficulty of controlling the switch tube in the totem pole bridgeless circuit system, and improves the utilization of the totem pole bridgeless circuit system. DRAWINGS

为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

图 1是现有技术中图腾柱变换电路***的结构示意图； 1 is a schematic structural view of a totem pole conversion circuit system in the prior art;

图 2是本发明实施例提供的图腾柱无桥电路***的结构示意图；图 3a是本发明实施例提供的图腾柱无桥电路***中一种电流采样单元工作于正向电流采集的结构状态示意图； 2 is a schematic structural diagram of a totem pole bridgeless circuit system according to an embodiment of the present invention; 3a is a schematic structural diagram of a current sampling unit operating in a forward current collection in a totem pole bridgeless circuit system according to an embodiment of the present invention;

图 3b是本发明实施例提供的图腾柱无桥电路***中一种电流采样单元工作于能量释放的结构状态示意图； FIG. 3b is a schematic structural diagram of a current sampling unit operating in a totem pole bridgeless circuit system according to an embodiment of the present invention;

图 3c是本发明实施例提供的图腾柱无桥电路***中一种电流采样单元工作于负向电流采集的结构状态示意图； 3c is a schematic structural view showing a state in which a current sampling unit operates in a negative current collection in a totem pole bridgeless circuit system according to an embodiment of the present invention;

图 3d是本发明实施例提供的图腾柱无桥电路***中一种电流采样单元工作于另一种能量释放的结构状态示意图； FIG. 3d is a schematic diagram showing the structure of a current sampling unit operating in another totem in a totem pole bridgeless circuit system according to an embodiment of the present invention; FIG.

图 4a是本发明实施例提供的图腾柱无桥电路***中另一种电流采样单元工作于正向电流采集的结构状态示意图； 4a is a schematic structural view showing another state in which a current sampling unit operates in forward current collection in a totem pole bridgeless circuit system according to an embodiment of the present invention;

图 4b是本发明实施例提供的图腾柱无桥电路***中另一种电流采样单元工作于能量释放的结构状态示意图； 4b is a schematic structural view showing another state in which a current sampling unit operates in an energy release in a totem pole bridgeless circuit system according to an embodiment of the present invention;

图 4c是本发明实施例提供的图腾柱无桥电路***中另一种电流采样单元工作于负向电流采集的结构状态示意图； 4c is a schematic structural diagram of another current sampling unit operating in a negative current collection in a totem pole bridgeless circuit system according to an embodiment of the present invention;

图 4d是本发明实施例提供的图腾柱无桥电路***中另一种电流采样单元工作于另一种能量释放的结构状态示意图。具体实施方式 4d is a schematic diagram showing the state of another current sampling unit operating in another totem of a totem pole bridgeless circuit system according to an embodiment of the present invention. Detailed ways

下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。 ***实施例一 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention. System embodiment one

一种图腾柱无桥电路***，结构示意图如图 2所示，包括： A totem pole bridgeless circuit system, the structure diagram shown in Figure 2, including:

并联连接于第一并联连接点 1和第二并联连接点 2之间的第一桥臂单元 10 和第二桥臂单元 20，所述第一桥臂单元 10中包括同向串联的第一二极管 D11 和第二二极管的 D12，即如图中第一二极管 D11的阳极连接第二二极管 D12的阴极；所述第二桥臂单元 20中包括同向串联的第一开关管 211和第二开关管 220; 在两个二极管间的第一连接点 4与两个开关管间的第二连接点 3之间连接有电源 ACl和电感 Ll，所述***还包括开关控制单元 30，且第二桥臂单元 20 还包括： a first bridge arm unit 10 and a second bridge arm unit 20 connected in parallel between the first parallel connection point 1 and the second parallel connection point 2, wherein the first bridge arm unit 10 includes the first two in the same direction The diode D11 and the D12 of the second diode, that is, the anode of the first diode D11 are connected to the cathode of the second diode D12; the second bridge arm unit 20 includes the first in the same direction. The switch tube 211 and the second switch tube 220; connect between the first connection point 4 between the two diodes and the second connection point 3 between the two switch tubes There is a power source AC1 and an inductor L1, the system further includes a switch control unit 30, and the second bridge arm unit 20 further includes:

两个电流采样单元，其中第一电流采样单元 210与所述两个开关管中的第一开关管 211串联于所述第一并联连接点 1和第二连接点 3之间；第二电流采样单元 221与所述两个开关管中的第二开关管 220串联于所述第二并联连接点 2 和第二连接点 3之间； Two current sampling units, wherein the first current sampling unit 210 and the first switching tube 211 of the two switching tubes are connected in series between the first parallel connection point 1 and the second connection point 3; the second current sampling The unit 221 is connected in series with the second switch tube 220 of the two switch tubes between the second parallel connection point 2 and the second connection point 3;

所述第一电流采样单元 210，用于当所述第一开关管 211闭合时，采集流过所述第一开关管 211的电流；当所述第一开关管 211断开时，释放第一电流采样单元 210采集的能量； The first current sampling unit 210 is configured to collect a current flowing through the first switch tube 211 when the first switch tube 211 is closed, and release the first when the first switch tube 211 is turned off. The energy collected by the current sampling unit 210;

所以第二电流采样单元 221，用于当所述第二开关管 220闭合时，采集流过所述第二开关管 220的电流；当所述第二开关管 220断开时，释放第二电流采样单元 221采集的能量； Therefore, the second current sampling unit 221 is configured to collect a current flowing through the second switch tube 220 when the second switch tube 220 is closed, and release a second current when the second switch tube 220 is turned off. The energy collected by the sampling unit 221;

所述开关控制单元 30，与所述两个电流采样单元及第一开关管 211和第二开关管 220连接，用于根据所述第一电流采样单元 210与所述第二电流采样单元 221采集的电流，控制所述第一开关管 211和所述第二开关管 221的闭合或断开。 The switch control unit 30 is connected to the two current sampling units and the first switch tube 211 and the second switch tube 220 for collecting according to the first current sampling unit 210 and the second current sampling unit 221 The current controls the closing or opening of the first switch tube 211 and the second switch tube 221.

具体地，第一电流采样单元 210及第二电流采样单元 221的电流输出端与开关控制单元 30的控制输入端相连接；且开关控制单元 30的两个控制输出端分别与第一开关管 211和第二开关管 220连接，且第一开关管 211的控制端与第一电流采样单元 210中电流采集的控制端连接，这样当第一开关管闭合或断开时，第一电流采样单元 210则相应地采集电流或释放能量，同样第二开关管 221 的控制端与第二电流采样单元 221中电流采集的控制端连接。 Specifically, the current output ends of the first current sampling unit 210 and the second current sampling unit 221 are connected to the control input end of the switch control unit 30; and the two control outputs of the switch control unit 30 and the first switch tube 211 are respectively Connected to the second switch tube 220, and the control end of the first switch tube 211 is connected to the control end of the current collection unit 210, so that when the first switch tube is closed or opened, the first current sampling unit 210 Then, the current is collected or released, and the control end of the second switching transistor 221 is connected to the control terminal of the current collecting in the second current sampling unit 221.

这样，根据第一电流采样单元 210和第二电流采样单元 221的电流输出端输出到的开关控制单元 30控制输入端的电流，开关控制单元 30控制开关管的闭合或断开，如控制第一开关管 211闭合，则通过相应的控制输出端将控制开关管闭合的信号输出给第一开管 211及第一电流采样单元 210，这样第一开关管 211接收到信号后会闭合，第一电流采样单元 210接收到信号后会开始进行电流采样。 Thus, according to the switch control unit 30 outputted by the current output terminals of the first current sampling unit 210 and the second current sampling unit 221, the current of the input terminal is controlled, and the switch control unit 30 controls the closing or opening of the switch tube, such as controlling the first switch. When the tube 211 is closed, the signal for controlling the closing of the switch tube is output to the first open tube 211 and the first current sampling unit 210 through the corresponding control output, so that the first switch tube 211 is closed after receiving the signal, and the first current sampling is performed. After receiving the signal, unit 210 will begin current sampling.

可以理解，这里第一电流采样单元 210和第二电流采样单元 221可以通过相同的方法来实现，如通过电流互感器等元器件来实现，这样，当电源 AC1 输入的为交流电的正半周时，闭合第二开关管 220、断开第一开关管 211，这时电感 Ll、第二开关管 220、第二二极管 D12及第二电流采样单元 221构成储能回路，第二电流采样单元 221采集流过所述第二开关管 220的正向电流；当对电感 L1的储能完成后，闭合第一开关管 211、断开第二开关管 220，这时电感 Ll、第一开关管 211、第二二极管 D12及第一电流采样单元 210构成续流回路，释放电感 L1上的能量，同时第一电流采样单元 210会采集流过所述第一开关管 211的正向电流，且第二电流采样单元 221会释放采集的能量。 It can be understood that the first current sampling unit 210 and the second current sampling unit 221 can pass here. The same method is implemented, for example, by a component such as a current transformer, so that when the power supply AC1 is input as the positive half cycle of the alternating current, the second switch tube 220 is closed, and the first switch tube 211 is turned off, and the inductor L1 is turned on. The second switch tube 220, the second diode D12 and the second current sampling unit 221 form an energy storage circuit, and the second current sampling unit 221 collects a forward current flowing through the second switch tube 220; After the energy storage is completed, the first switch tube 211 is closed, and the second switch tube 220 is turned off. At this time, the inductor L1, the first switch tube 211, the second diode D12, and the first current sampling unit 210 constitute a freewheeling circuit. The energy on the inductor L1 is released, while the first current sampling unit 210 collects the forward current flowing through the first switch 211, and the second current sampling unit 221 releases the collected energy.

当电源 AC1输入的为交流电的负半周时，闭合第一开关管 211、断开第二开关管 220，这时第一二极管 Dl l、第一开关管 211、电感 L1及第一电流采样单元 210构成储能回路，第一电流采样单元 210采集流过第一开关管 211的负向电流；当对电感 L1储能完成，闭合第二开关管 220、断开第一开关管 211，这时第一二极管 Dl l、第二开关管 220、电感 L1及第二电流采样单元 221构成续流回路，释放电感 L1上的能量，同时第二电流采样单元 221会采集流过第二开关管 220的负向电流，而第一电流采样单元 210会释放采集的能量。 When the power supply AC1 is input to the negative half cycle of the alternating current, the first switch tube 211 is closed and the second switch tube 220 is turned off. At this time, the first diode D1 l, the first switch tube 211, the inductor L1 and the first current sampling are turned off. The unit 210 constitutes an energy storage circuit. The first current sampling unit 210 collects a negative current flowing through the first switching tube 211. When the energy storage for the inductor L1 is completed, the second switching tube 220 is closed and the first switching tube 211 is turned off. The first diode D1 l, the second switch 220, the inductor L1 and the second current sampling unit 221 form a freewheeling circuit, which releases the energy on the inductor L1, and the second current sampling unit 221 collects and flows through the second switch. The negative current of the tube 220, and the first current sampling unit 210 releases the collected energy.

从上述电路***的运行可以看出，在第二电流采样单元 221的正向或负向减小时，需要控制第二开关管 220断开，第一开关管 211闭合；在第一采样单元 210的电流正向或负向减小时，需要控制第一开关管 211断开，第二开关管 220闭合。 It can be seen from the operation of the above circuit system that when the forward or negative direction of the second current sampling unit 221 decreases, it is necessary to control the second switch tube 220 to be turned off, and the first switch tube 211 is closed; at the first sampling unit 210 When the current decreases in the positive or negative direction, it is necessary to control the first switch tube 211 to be turned off, and the second switch tube 220 to be closed.

参考图 3a到图 3d所示，在一个具体的实施例中，第一电流采样单元 210和第二电流采样单元 221用相同的方式来实现，可以包括： Referring to FIG. 3a to FIG. 3d, in a specific embodiment, the first current sampling unit 210 and the second current sampling unit 221 are implemented in the same manner, and may include:

电流互感器 T，两个同极互联的稳压二极管 d5和 d6 (图中为阴极互联）、四个二极体 dl到 d4、采样开关管 S和采样电阻 R，所述电流互感器 T包括原边绕阻和副边绕阻； Current transformer T, two Zener diodes d5 and d6 (the cathode interconnection in the figure), four diodes dl to d4, a sampling switch S and a sampling resistor R, the current transformer T includes Primary winding and secondary winding;

两个所述二极体 dl和 d3同极串联成第一采样桥；另两个所述二极体 d2和 d4同极串联成第二采样桥，所述第一采样桥与第二采样桥中，其中一个采样桥包括的二极体是同阳极相连，另一个采样桥包括的二极体是同阴极相连；图中第一采样桥包括的 dl和 d3是同阴极相连，而第二采样桥包括的 d2和 d4是同阳极相连；所述第一采样桥与第二采样桥分别与所述副边绕阻的两端 a和 b并联连接；所述两个稳压二极管 d5和 d6同极连接后，另外两端即两个阳极分别与所述副边绕阻的两端 a和 b连接； Two of the diodes dl and d3 are connected in series to form a first sampling bridge; the other two of the diodes d2 and d4 are connected in series to form a second sampling bridge, the first sampling bridge and the second sampling bridge. One of the sampling bridges includes a diode connected to the anode, and the other sampling bridge includes a diode connected to the cathode. The first sampling bridge includes dl and d3 connected to the cathode and the second sampling. The bridge includes d2 and d4 connected to the anode; The first sampling bridge and the second sampling bridge are respectively connected in parallel with the two ends a and b of the secondary winding; the two Zener diodes d5 and d6 are connected to the same pole, and the other ends are two anodes Connected to both ends a and b of the secondary winding;

所述原边绕阻的两端 c和 d连接在所述第二桥臂单元 20中，即原边绕阻与第一开关管 211串联于第一并联连接点 1和第二连接点 3之间，或与第二开关管 220串联于第二并联连接点 2和第二连接点 3之间； The two ends c and d of the primary winding are connected in the second bridge arm unit 20, that is, the primary winding and the first switching tube 211 are connected in series to the first parallel connection point 1 and the second connection point 3 Interposed, or in series with the second switch tube 220 between the second parallel connection point 2 and the second connection point 3;

所述第一采样桥中两个二极体 dl和 d3的同极连接点 5与所述第二采样桥中两个二极体 d2和 d4的同极连接点 6之间连接有呈串联连接的所述采样开关管 S和采样电阻 R。这样当采样开关管 S闭合时，该电流采样单元会采集电流互感器 T上流过的电流，闭合时，释放电流互感器 T的能量。 The same pole connection point 5 of the two diodes dl and d3 in the first sampling bridge and the same pole connection point 6 of the two diodes d2 and d4 in the second sampling bridge are connected in series The sampling switch tube S and the sampling resistor R. Thus, when the sampling switch S is closed, the current sampling unit collects the current flowing through the current transformer T, and when closed, releases the energy of the current transformer T.

所述采样电阻 R与开关控制单元 30连接，当所述采样开关管 S及第一开关管或第二开关管闭合时，所述电流采样单元对应地采集与该电流采样单元连接的第一开关管或第二开关管上流过的电流，即第二采样单元 221中采样开关管 S与第二开关管 20闭合和断开的时序一致，而第一采样单元 210中的采样开关管 S与第一开关管 211闭合和断开的时序一致。 The sampling resistor R is connected to the switch control unit 30. When the sampling switch tube S and the first switch tube or the second switch tube are closed, the current sampling unit correspondingly collects the first switch connected to the current sampling unit. The current flowing through the tube or the second switch tube, that is, the timing at which the sampling switch tube S and the second switch tube 20 are closed and opened in the second sampling unit 221, and the sampling switch tube S and the first sampling unit 210 The timing of closing and opening of a switch tube 211 is the same.

可以理解，本实施例中，在开关控制单元 30对第一开关管 211的闭合或断开进行控制时，当第一电流采样单元 210的电流正向减小或负向减小，则控制第一开关管 211断开，第二开关管 220闭合；当第二电流采样单元 221的电流正向减小或负向减小，则控制第二开关管 220断开，第一开关管 211闭合。 It can be understood that, in this embodiment, when the switch control unit 30 controls the closing or opening of the first switch tube 211, when the current of the first current sampling unit 210 decreases or decreases negatively, the control unit A switch tube 211 is opened, and the second switch tube 220 is closed. When the current of the second current sampling unit 221 decreases or decreases negatively, the second switch tube 220 is controlled to be turned off, and the first switch tube 211 is closed.

本实施例中的电流采样单元在工作时，如图 3a所示，当采样开关管 S闭合，且电流互感器 T的原边绕阻流过如图所示的正向电流时，电流互感器 T的副边绕阻也流过正向电流，则电流互感器 T中副边绕阻、二极体 dl、采样开关管 S、采样电阻 R及二极体 d4组成储能电路，即图 3a中实线回路，并按照图中箭头方向采集相连接的第一开关管或第二开关管上流过的正向电流；如图 3b所示，当采样开关管 S断开时，这时电流互感器 T中副边绕阻、稳压二极管 d5和 d6组成续流回路，即图 3b中实线回路，并按照正向电流的反向，即图中箭头所指方向释放采集的能量，这时稳压二极管 d5工作在被击穿的状态。 When the current sampling unit in this embodiment is in operation, as shown in FIG. 3a, when the sampling switch tube S is closed, and the primary winding of the current transformer T flows through the forward current as shown in the figure, the current transformer The secondary winding of T also flows forward current, and the secondary winding of the current transformer T, the diode dl, the sampling switch S, the sampling resistor R and the diode d4 form a storage circuit, that is, Figure 3a In the solid line circuit, and collect the forward current flowing through the connected first switch tube or the second switch tube according to the direction of the arrow in the figure; as shown in FIG. 3b, when the sampling switch tube S is disconnected, current mutual inductance The secondary winding in the T, the Zener diodes d5 and d6 form a freewheeling circuit, that is, the solid line in Figure 3b, and release the collected energy according to the reverse direction of the forward current, that is, the direction indicated by the arrow in the figure. The Zener diode d5 operates in a state of being broken down.

如图 3c所示，当采样开关管 S闭合，且电流互感器 T的原边绕阻流过如图所示的负向电流时，电流互感器 T的副边绕阻也流过负向电流，则电流互感器 T中副边绕阻、二极体 d2、二极体 d3、采样开关管 S及采样电阻 R组成储能电路，即图 3c中的实线回路，并按照图中虚线箭头方向采集相连接的第一开关管或第二开关管上流过的负向电流；如图 3d所示，当采样开关管 S断开时，这时电流互感器 T中副边绕阻、稳压二极管 d5和 d6组成续流回路，即图 3d中的实线回路，并按照负向电流的反向，即图中箭头所指方向释放采集的能量，这时稳压二极管 d6工作在被击穿的状态。 As shown in FIG. 3c, when the sampling switch S is closed and the primary winding of the current transformer T flows through the negative current as shown in the figure, the secondary winding of the current transformer T also flows through the negative current. Current transformer The secondary side winding resistance, the diode d2, the diode d3, the sampling switch tube S and the sampling resistor R form a tank circuit, that is, the solid line circuit in Fig. 3c, and are connected according to the direction of the dotted arrow in the figure. The negative current flowing through the first switch tube or the second switch tube; as shown in FIG. 3d, when the sampling switch tube S is disconnected, the secondary side winding of the current transformer T, the Zener diodes d5 and d6 are composed. The freewheeling circuit, that is, the solid line circuit in Fig. 3d, releases the collected energy according to the reverse direction of the negative current, that is, the direction indicated by the arrow in the figure, at which time the Zener diode d6 operates in a state of being broken down.

其中稳压二极管 d5和 d6的稳压值需要高，如在采样电阻 R工作电压 4倍的范围，这样使得在电流互感器 T的储能时间大于释放能量时间，即电流互感器的占空比（duty )大于 50%时，如果稳压二极管的稳压值高时，会使得在短时间内储存到电流互感器 T的能量得到充分的释放；另外，本实施例中用互感器来采集电流能实现电压隔离。 The voltage regulation values of the Zener diodes d5 and d6 need to be high, such as in the range of 4 times the working voltage of the sampling resistor R, so that the energy storage time of the current transformer T is greater than the time of releasing energy, that is, the duty ratio of the current transformer. When the (duty) is greater than 50%, if the voltage regulator diode has a high voltage regulation value, the energy stored in the current transformer T in a short time is fully released. In addition, in this embodiment, the transformer is used to collect the current. Can achieve voltage isolation.

本实施例中开关管为绝缘栅型场效应管（ Mosfet )，或绝缘栅型双极型晶体管（IGBT )，或双极结型晶体管（BJT )等。 In this embodiment, the switching transistor is an insulated gate field effect transistor (Mosfet), or an insulated gate bipolar transistor (IGBT), or a bipolar junction transistor (BJT).

参考图 4a到图 4d所示，在另一个具体的实施例中，第一电流采样单元 210 和第二电流采样单元 221用相同的方式来实现，可以包括： Referring to FIG. 4a to FIG. 4d, in another specific embodiment, the first current sampling unit 210 and the second current sampling unit 221 are implemented in the same manner, and may include:

电流互感器 Tl，两个同极互联的稳压二极管 d9和 dlO (图中为阴极互联）、两个二极体 d7和 d8、采样开关管 S，和采样电阻 R1 ; 所述电流互感器 T1包括原边绕阻和连接于绕阻端点 s的两个副边绕阻； Current transformer Tl, two Zener diodes d9 and dlO (the cathode interconnection in the figure), two diodes d7 and d8, sampling switch S, and sampling resistor R1; the current transformer T1 The primary side winding and the two secondary windings connected to the winding end s are included;

所述电流互感器 T1的原边绕阻的两端 p和 q连接与所述第二桥臂单元 20 中，即原边绕阻与第一开关管 211串联于第一并联连接点 1和第二连接点 3之间，或与第二开关管 220串联于第二并联连接点 2和第二连接点 3之间； The two ends p and q of the primary winding of the current transformer T1 are connected to the second bridge arm unit 20, that is, the primary winding and the first switching tube 211 are connected in series with the first parallel connection point 1 and Between the two connection points 3, or in series with the second switch tube 220 between the second parallel connection point 2 and the second connection point 3;

在所述两个副边绕阻中的第一副边绕阻的绕阻端点 s和另一端点 7之间，有呈串联连接的所述采样开关管 S，、采样电阻 R1及一个二极体 d7; 在所述两个副边绕阻的两个非绕阻端点 7和 8之间，有呈同极串联连接的两个二极体 d7和 d8，且并联有呈同极串联连接的两个稳压二极管 d9和 dl0，图中为同阳极连接。这样当采样开关管 S，闭合时，该电流采样单元会采集电流互感器 T1上流过的电流，释放电流互感器 T1的能量。 Between the winding end point s of the first secondary winding of the two secondary windings and the other end point 7, there is a sampling switch tube S connected in series, a sampling resistor R1 and a diode a body d7; between the two non-winding terminals 7 and 8 of the two secondary windings, two diodes d7 and d8 connected in series in the same polarity, and connected in parallel in series with the same pole Two Zener diodes d9 and dl0, which are connected to the same anode. Thus, when the sampling switch S is closed, the current sampling unit collects the current flowing through the current transformer T1 and releases the energy of the current transformer T1.

采样电阻 R1与开关控制单元 30连接，当所述采样开关管 S，以及第一开关管或第二开关管闭合时，所述电流采样单元对应地采集与该电流采样单元连接的第一开关管或第二开关管上流过的电流，即第二采样单元 221中的采样开关管 S，与第二开关管 220闭合和断开的时序相同或相应，即一致，而第一采样单元 210中的采样开关管 S，与第一开关管 211闭合和断开的时序相同或相应，即一致。 The sampling resistor R1 is connected to the switch control unit 30. When the sampling switch tube S and the first switch tube or the second switch tube are closed, the current sampling unit is correspondingly collected and connected to the current sampling unit. The current flowing through the first switch tube or the second switch tube, that is, the sampling switch tube S in the second sampling unit 221, is the same as or corresponding to the timing at which the second switch tube 220 is closed and opened, that is, the same The sampling switch tube S in the sampling unit 210 is the same or corresponding to the timing at which the first switching tube 211 is closed and opened, that is, coincident.

本实施例中的采样单元在工作时，如图 4a所示，当采样开关管 S，闭合，且电流互感器 T1的原边绕阻流过如图所示的正向电流时，电流互感器 T1的两个副边绕阻也流过正向电流，则电流互感器 T1中第一副边绕阻、二极体 d7、采样开关管 S，及采样电阻 R1即组成储能电路，即图 4a中的实线回路，并按照实线箭头方向采集相连接的第一开关管或第二开关管上流过的正向电流；如图 4b所示，当采样开关管 S，断开时，这时电流互感器 T1中两个副边绕阻、稳压二极管 d9和 dlO组成续流回路，即图 4b中的实线回路，并按照正向电流的反向，即图中箭头方向释放采集的能量，这时稳压二极管 d9工作在被击穿的状态。 When the sampling unit in this embodiment is in operation, as shown in FIG. 4a, when the sampling switch tube S is closed, and the primary side winding of the current transformer T1 flows through the forward current as shown in the figure, the current transformer The two secondary windings of T1 also flow forward current, and the first secondary winding in the current transformer T1, the diode d7, the sampling switch S, and the sampling resistor R1 constitute a storage circuit, that is, a diagram The solid line circuit in 4a, and collect the forward current flowing on the connected first switch tube or the second switch tube according to the direction of the solid line arrow; as shown in FIG. 4b, when the sampling switch tube S is disconnected, this The two secondary windings of the current transformer T1, the Zener diodes d9 and dlO form a freewheeling loop, that is, the solid loop in Figure 4b, and are released according to the reverse direction of the forward current, that is, the direction of the arrow in the figure. Energy, at which time the Zener diode d9 operates in a state of breakdown.

如图 4c所示，当采样开关管 S，闭合，且电流互感器 T1的原边绕阻流过如图所示的负向电流时，电流互感器 T1的两个副边绕阻也流过负向电流，则电流互感器 T1中第二副边绕阻、二极体 d8、采样开关管 S，及采样电阻 R1即组成储能电路，即图 4c中的实线回路，并按照虚线箭头方向采集相连接的第一开关管或第二开关管上流过的负向电流；如图 4d所示，当采样开关管 S，断开时，这时电流互感器 T1中两个副边绕阻、稳压二极管 d9和 dlO组成续流回路，即图 4d中的实线回路，并按照负向电流的反向，即图中箭头方向释放采集的能量，这时稳压二极管 d 10工作在被击穿的状态。 As shown in FIG. 4c, when the sampling switch S is closed, and the primary winding of the current transformer T1 flows through the negative current as shown in the figure, the two secondary windings of the current transformer T1 also flow. Negative current, the second secondary winding in the current transformer T1, the diode d8, the sampling switch S, and the sampling resistor R1 constitute the energy storage circuit, that is, the solid line circuit in Figure 4c, and according to the dotted arrow The direction collects the negative current flowing through the connected first switch tube or the second switch tube; as shown in FIG. 4d, when the sampling switch tube S is disconnected, then the two secondary windings in the current transformer T1 are wound. The Zener diodes d9 and dlO form a freewheeling circuit, that is, the solid line circuit in Figure 4d, and release the collected energy according to the reverse direction of the negative current, that is, the direction of the arrow in the figure. At this time, the Zener diode d 10 works in the The state of breakdown.

其中稳压二极管 d9和 dlO的稳压值需要高，如在采样电阻 R1工作电压 4倍的范围，这样使得在电流互感器 T1的储能时间大于释放能量时间，即电流互感器的占空比（duty ) 大于 50%时，如果稳压二极管的稳压值高时，会使得在短时间内储存到电流互感器 T的能量得到充分的释放；两外，本实施例中用互且本实施例中开关管也为绝缘栅型场效应管（ Mosfet )，或绝缘栅型双极型晶体管（IGBT )，或双极结型晶体管（BJT )等。 The voltage regulation values of the Zener diodes d9 and dlO need to be high, such as in the range of 4 times the working voltage of the sampling resistor R1, so that the energy storage time of the current transformer T1 is greater than the time of releasing energy, that is, the duty ratio of the current transformer. When (duty) is greater than 50%, if the voltage regulator diode has a high voltage regulation value, the energy stored in the current transformer T in a short time is fully released; In this embodiment, the switch tube is also an insulated gate field effect transistor (Mosfet), or an insulated gate bipolar transistor (IGBT), or a bipolar junction transistor (BJT).

可见，本发明实施例的图腾柱无桥电路***中，包括开关控制单元 30，在第二桥臂单元 20中增加了两个电流采样单元，所述开关控制单元 30通过第一电流采样单元 210和第二电流采样单元 221采集的电流，分别控制第二桥臂单元 20中的第一开关管 211和第二开关管 220的闭合或断开，和现有技术中图腾柱无桥电路***相比，本发明实施例的***能通过电流采样单元采集的电流来控制开关管的断开或闭合，降低了图腾柱无桥电路***中对开关管控制的难度，提高了图腾柱无桥电路***的利用率。装置实施例二 It can be seen that, in the totem pole bridgeless circuit system of the embodiment of the present invention, the switch control unit 30 is included, and two current sampling units are added to the second bridge arm unit 20, and the switch control unit 30 passes the first current sampling unit 210. And the current collected by the second current sampling unit 221 respectively controls the closing or opening of the first switching tube 211 and the second switching tube 220 in the second bridge arm unit 20, and the totem pole bridgeless circuit system in the prior art. The system of the embodiment of the invention can control the opening or closing of the switch tube by the current collected by the current sampling unit, thereby reducing the difficulty of controlling the switch tube in the totem pole bridgeless circuit system, and improving the totem pole bridgeless circuit system. Utilization. Device embodiment 2

一种电流采样装置，本实施例的***可以用在电力电子交流整流电流的采样，也可以用在多相交流整流电流的采样，结构示意图如图 3a到 3d所示，包括： A current sampling device, the system of the embodiment can be used for sampling of power electronic AC rectified current, and can also be used for sampling of multi-phase AC rectified current. The structure diagram is shown in Figures 3a to 3d, including:

两个所述二极体 dl和 d3同极串联成第一采样桥；另两个所述二极体 d2和 d4同极串联成第二采样桥，所述第一采样桥与第二采样桥中，其中一个采样桥包括的二极体是同阳极相连，另一个采样桥包括的二极体是同阴极相连；图中第一采样桥中 dl和 d3同阴极相连，第二采样桥中 d2和 d4同阳极相连；所述第一采样桥与第二采样桥分别与所述副边绕阻的两端 a和 b并联连接；同极串联后的所述两个稳压二极管 d5和 d6另两个端点，即两个阳极分别与所述副边绕阻的两端 a和 b连接； Two of the diodes dl and d3 are connected in series to form a first sampling bridge; the other two of the diodes d2 and d4 are connected in series to form a second sampling bridge, the first sampling bridge and the second sampling bridge. One of the sampling bridges includes a diode connected to the anode, and the other sampling bridge includes a diode connected to the cathode. In the first sampling bridge, dl and d3 are connected to the cathode, and the second sampling bridge is d2. And the d4 is connected to the anode; the first sampling bridge and the second sampling bridge are respectively connected in parallel with the two ends a and b of the secondary winding; the two Zener diodes d5 and d6 connected in series with the same pole are Two end points, that is, two anodes are respectively connected to both ends a and b of the secondary winding;

所述原边的两端 c和 d与被采样电路连接； The two ends c and d of the primary side are connected to the sampling circuit;

所述第一采样桥中两个二极体 dl和 d3的同极连接点 5与所述第二采样桥中两个二极体 d2和 d4的同极连接点 6之间连接有呈串联连接的所述采样开关管 S和采样电阻 R; The same pole connection point 5 of the two diodes dl and d3 in the first sampling bridge and the same pole connection point 6 of the two diodes d2 and d4 in the second sampling bridge are connected in series The sampling switch tube S and the sampling resistor R;

本实施例中的采样装置在工作时，如图 3a所示，当采样开关管 S闭合，且电流互感器 T的原边绕阻流过正向电流时，电流互感器 Τ的副边绕阻也流过正向电流，则电流互感器 Τ中副边绕阻、二极体 dl、采样开关管 S、采样电阻 R 及二极体 d4即组成储能电路，即图 3a中的实线回路，按照箭头方向采集正向电流；如图 3b所示，当采样开关管 S断开时，这时电流互感器 T中副边绕阻、稳压二极管 d5和 d6组成续流回路，即图 3b中的实线回路，并按正向电流的反向，即箭头方向释放采集的能量，这时稳压二极管 d5工作在被击穿的状态。 When the sampling device in this embodiment is in operation, as shown in FIG. 3a, when the sampling switch tube S is closed, and When the primary winding of the current transformer T flows through the forward current, the secondary winding of the current transformer 也 also flows forward current, then the secondary winding of the current transformer Τ, the diode dl, the sampling switch The tube S, the sampling resistor R and the diode d4 constitute a tank circuit, that is, the solid line circuit in Fig. 3a, and the forward current is collected according to the direction of the arrow; as shown in Fig. 3b, when the sampling switch tube S is disconnected, this When the secondary winding of the current transformer T, the Zener diodes d5 and d6 form a freewheeling circuit, that is, the solid line circuit in Fig. 3b, and release the collected energy according to the reverse direction of the forward current, that is, the direction of the arrow. The Zener diode d5 operates in a state of being broken down.

如图 3c所示，当采样开关管 S闭合，且电流互感器 T的原边绕阻流过负向电流时，电流互感器 T的副边绕阻也流过负向电流，则电流互感器 T中副边绕阻、二极体 d2、二极体 d3、采样开关管 S及采样电阻 R即组成储能电路，即图 3c中的实线回路，按照虚线箭头方向采集负向电流；如图 3d所示，当采样开关管 S断开时，这时电流互感器 T中副边绕阻、稳压二极管 d5和 d6组成续流回路，即图 3d中实线回路，并按照负向电流的反向，即箭头方向释放采集的能量，这时稳压二极管 d6工作在被击穿的状态。 As shown in FIG. 3c, when the sampling switch tube S is closed, and the primary side of the current transformer T flows through the negative current, the secondary winding of the current transformer T also flows through the negative current, and the current transformer The secondary side winding resistance in T, the diode d2, the diode d3, the sampling switch tube S and the sampling resistor R constitute the energy storage circuit, that is, the solid line circuit in Fig. 3c, and collect the negative current according to the direction of the dotted arrow; As shown in Fig. 3d, when the sampling switch S is disconnected, the secondary winding of the current transformer T, the Zener diodes d5 and d6 constitute a freewheeling circuit, that is, the solid line in Fig. 3d, and according to the negative current The reverse direction, that is, the direction of the arrow releases the collected energy, at which time the Zener diode d6 operates in a state of being broken down.

其中稳压二极管 d5和 d6的稳压值需要高，如在采样电阻 R工作电压 4倍的范围，这样使得在电流互感器 T的储能时间大于释放能量时间，即电流互感器的占空比（duty )大于 50%时，如果稳压二极管的稳压值高时，会使得在短时间内储存到电流互感器 T的能量得到充分的释放；两外，本实施例中用互感器来采集电流能实现电压隔离。 The voltage regulation values of the Zener diodes d5 and d6 need to be high, such as in the range of 4 times the working voltage of the sampling resistor R, so that the energy storage time of the current transformer T is greater than the time of releasing energy, that is, the duty ratio of the current transformer. When (duty) is greater than 50%, if the voltage regulator diode has a high voltage regulation value, the energy stored in the current transformer T in a short time is fully released. In addition, in this embodiment, the transformer is used to collect. Current can achieve voltage isolation.

上述的采样开关管为绝缘栅型场效应管（Mosfet )，或绝缘栅型双极型晶体管（IGBT )，或双极结型晶体管（BJT )等。 The sampling switch tube described above is an insulated gate field effect transistor (Mosfet), or an insulated gate bipolar transistor (IGBT), or a bipolar junction transistor (BJT).

可见，本实施例中的电流采样装置可以采集交流电的电流即采集电源的双向电流，即通过电流互感器 T中副边绕阻、二极体 dl、采样开关管 S、采样电阻 R及二极体 d4组成的储能电路，来采集正向电流，通过电流互感器 T中副边绕阻、二极体 d2、二极体 d3、采样开关管 S及采样电阻 R组成的储能电路，来采集负向电流，和现有技术中只能采集单向电流的电流采样装置相比，本实施例的电流采样装置应用更广泛。装置实施例三 It can be seen that the current sampling device in this embodiment can collect the alternating current current, that is, the bidirectional current of the power supply, that is, through the secondary winding of the current transformer T, the diode dl, the sampling switch tube S, the sampling resistor R and the diode. The storage circuit composed of the body d4 collects the forward current, and the storage circuit composed of the secondary winding of the current transformer T, the diode d2, the diode d3, the sampling switch tube S and the sampling resistor R The negative current is collected, and the current sampling device of the present embodiment is more widely used than the current sampling device in the prior art which can only collect unidirectional current. Device embodiment three

一种电流采样装置，本实施例的***可以用在电力电子交流整流电流的采样，也可以用在多相交流整流电流的采样，结构示意图如图 4a到 4d所示，包括： A current sampling device, the system of the embodiment can be used for sampling of power electronic alternating current rectification current, and can also be used for sampling of multi-phase alternating current rectification current, and the structural schematic diagram is shown in Figures 4a to 4d. include:

所述电流互感器 T1的原边绕阻的两端 p和 q与被采样电路连接； The two ends p and q of the primary winding of the current transformer T1 are connected to the circuit to be sampled;

所述两个副边绕阻中的第一副边绕阻的绕阻端点 s和另一端点 7之间，有呈串联连接的所述采样开关管 S，、采样电阻 R1及一个二极体 d7; 所述两个副边绕阻的两个非绕阻端点 7和 8之间，有呈同极串联连接的两个二极体 d7和 d8，且并联有呈同极串联连接的所述两个稳压二极管 d9和 dl0，图中为同阳极连接。 Between the winding end point s of the first secondary winding of the two secondary windings and the other end point 7, there is a sampling switch tube S connected in series, a sampling resistor R1 and a diode D7; between the two non-winding terminals 7 and 8 of the two secondary windings, having two diodes d7 and d8 connected in series in the same polarity, and having the same in series connected in parallel Two Zener diodes d9 and dl0, which are connected to the same anode.

本实施例中的采样装置在工作时，如图 4a所示，当采样开关管 S' 闭合，且电流互感器 T1的原边绕阻流过正向电流时，电流互感器 T1的两个副边绕阻也流过正向电流，则电流互感器 T1中第一副边绕阻、二极体 d7、采样开关管 S，及采样电阻 R1即组成储能电路，即图 4a中的实线回路，按照实线箭头方向采集正向电流；如图 4b所示，当采样开关管 S，断开时，这时电流互感器 T1中两个副边绕阻、稳压二极管 d9和 dlO组成续流回路，即图 4b中的实线回路，并按照正向电流的反向，即箭头方向释放采集的能量，这时稳压二极管 d9工作在被击穿的状态。 When the sampling device in this embodiment is in operation, as shown in FIG. 4a, when the sampling switch tube S' is closed, and the primary side of the current transformer T1 flows through the forward current, the two pairs of the current transformer T1 The forward winding also flows through the forward current, and the first secondary winding resistance, the diode d7, the sampling switch tube S, and the sampling resistor R1 of the current transformer T1 constitute a storage circuit, that is, the solid line in FIG. 4a. In the loop, the forward current is collected according to the direction of the solid arrow; as shown in Fig. 4b, when the sampling switch S is disconnected, the two secondary windings of the current transformer T1, the Zener diodes d9 and dlO are continued. The flow circuit, that is, the solid line circuit in Fig. 4b, releases the collected energy according to the reverse direction of the forward current, that is, the direction of the arrow, at which time the Zener diode d9 operates in a state of being broken down.

如图 4c所示，当采样开关管 S，闭合，且电流互感器 T1的原边流过负向电流时，电流互感器 T1的两个副边绕阻也流过负向电流，则电流互感器 T1中第二副边绕阻、二极体 d8、采样开关管 S' 及采样电阻 R即组成储能电路，即图 4c中的实线回路，按照虚线箭头方向采集负向电流；如图 4d所示，当采样开关管 S，断开时，这时电流互感器 T1中两个副边绕阻、稳压二极管 d9和 dlO组成续流回路，即图 4d中的实线回路，按负向电流的反向，即箭头方向释放采集的能量，这时稳压二极管 dlO工作在被击穿的状态。 As shown in Fig. 4c, when the sampling switch S is closed, and the primary side of the current transformer T1 flows through the negative current, the two secondary windings of the current transformer T1 also flow through the negative current, and the current mutual inductance The second secondary winding resistance, the diode d8, the sampling switch tube S' and the sampling resistor R in the device T1 constitute a storage circuit, that is, the solid line circuit in FIG. 4c, and collects the negative current according to the direction of the dotted arrow; 4d, when the sampling switch S is disconnected, the two secondary windings of the current transformer T1, the Zener diodes d9 and dlO form a freewheeling circuit, that is, the solid line in Figure 4d, according to the negative The collected energy is released in the opposite direction of the current, that is, in the direction of the arrow, at which time the Zener diode dlO operates in a state of being broken down.

本实施例中的电流采样装置可以采集交流电的电流即采集电源的双向电流，即通过电流互感器 T1的两个副边绕阻也流过正向电流，则电流互感器 T1 中第一副边绕阻、二极体 d7、采样开关管 S，及采样电阻 R1组成的储能电路，来采集正向电流，通过电流互感器 T1中第二副边绕阻、二极体 d8、采样开关管 S，及采样电阻 R组成的储能电路，来采集负向电流。和现有技术中只能采集单向电流的电流采样装置相比，本实施例的电流采样装置应用更广泛；且和实施例二中的电流采样装置相比，结构简单，所用电子器件少，能节省资源，从而使得电路的消耗较少。 The current sampling device in this embodiment can collect the current of the alternating current, that is, the bidirectional current of the power supply, that is, the forward current flows through the two secondary windings of the current transformer T1, and the first secondary side of the current transformer T1 A storage circuit composed of a winding resistor, a diode d7, a sampling switch tube S, and a sampling resistor R1 to collect a forward current, through a second secondary winding of the current transformer T1, a diode d8, a sampling switch tube S, and a storage circuit composed of a sampling resistor R, to collect a negative current. Compared with the current sampling device capable of collecting only one-way current in the prior art, the current sampling device of the embodiment is more widely used; and compared with the current sampling device of the second embodiment, the structure is simple and the number of electronic devices used is small. It saves resources and makes the circuit consume less.

综上所述，本发明实施例的图腾柱无桥电路***中，包括开关控制单元，在第二桥臂单元中增加了两个电流采样单元，所述开关控制单元通过第一电流采样单元和第二电流采样单元采集的电流，分别控制第二桥臂单元中的第一开关管和第二开关管的闭合或断开，和现有技术中图腾柱无桥电路***相比，本发明实施例的***能通过电流采样单元采集的电流来控制开关管的断开或闭合，降低了图腾柱无桥电路***中对开关管控制的难度，提高了图腾柱无桥电路***的利用率。 In summary, the totem pole bridgeless circuit system of the embodiment of the present invention includes a switch control unit, and two current sampling units are added to the second bridge arm unit, and the switch control unit passes the first current sampling unit and The current collected by the second current sampling unit controls the closing or opening of the first switching tube and the second switching tube in the second bridge arm unit, respectively, compared with the prior art totem pole bridgeless circuit system, and the invention is implemented The system can control the opening or closing of the switch tube by the current collected by the current sampling unit, which reduces the difficulty of controlling the switch tube in the totem pole bridgeless circuit system, and improves the utilization of the totem pole bridgeless circuit system.

应当理解的是，本发明实施例方案还可以应用于电力电子交流整流电流采样，同样也可以应用于多相交流整流的电流采样。以上对本发明实施例所提供的图腾柱无桥电路***及电流采样装置，进行了详细介绍，本文中应用用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。 It should be understood that the solution of the embodiment of the present invention can also be applied to power electronic alternating current rectification current sampling, and can also be applied to current sampling of multi-phase alternating current rectification. The totem pole bridgeless circuit system and current sampling device provided by the embodiments of the present invention are described in detail above, and are used herein to help understand the method and core idea of the present invention. Meanwhile, for those skilled in the art, In view of the above, the description of the present invention is not limited to the scope of the present invention.

Claims

权利要求书 Claim

1、一种图腾柱无桥电路***，包括：并联连接于第一并联连接点和第二并联连接点之间的第一桥臂单元和第二桥臂单元，所述第一桥臂单元中包括同向串联的第一二极管和第二二极管；所述第二桥臂单元中包括同向串联的第一开关管和第二开关管；在所述两个二极管间的第一连接点与所述两个开关管间的第二连接点之间连接有电源和电感，其特征在于，所述***还包括开关控制单元，且所述第二桥臂单元还包括： A totem pole bridgeless circuit system, comprising: a first bridge arm unit and a second bridge arm unit connected in parallel between a first parallel connection point and a second parallel connection point, wherein the first bridge arm unit is The first diode and the second diode are connected in series in the same direction; the second bridge arm unit includes a first switch tube and a second switch tube connected in series in the same direction; the first between the two diodes A power supply and an inductor are connected between the connection point and the second connection point between the two switch tubes. The system further includes a switch control unit, and the second bridge arm unit further includes:

2、如权利要求 1所述的***，其特征在于，所述电流采样单元包括：电流互感器，两个稳压二极管、四个二极体、采样开关管和采样电阻，所述电流互感器包括原边绕阻和副边绕阻； 2. The system according to claim 1, wherein the current sampling unit comprises: a current transformer, two Zener diodes, four diodes, a sampling switch tube, and a sampling resistor, the current transformer Including primary winding and secondary winding;

两个所述二极体同极串联成第一采样桥；另两个所述二极体以同极串联成第二采样桥，所述第一采样桥与第二采样桥中，其中一个采样桥包括的二极体是同阳极相连，另一个采样桥包括的二极体是同阴极相连；且所述第一采样桥与第二采样桥分别与所述副边绕组的两端并联连接； Two of the diodes are connected in series to form a first sampling bridge; the other two of the diodes are connected in series to form a second sampling bridge, and the first sampling bridge and the second sampling bridge, one of the sampling The diode includes a diode connected to the anode, and the other sampling bridge includes a diode connected to the cathode; and the first sampling bridge and the second sampling bridge are respectively connected in parallel with both ends of the secondary winding;

所述两个稳压二极管同极连接后，另外两端分别与所述副边绕阻的两端并联连接； After the two Zener diodes are connected to the same pole, the other ends are respectively connected in parallel with the two ends of the secondary winding;

所述原边绕阻与所述第一开关管串联于所述第一并联连接点和第二连接点之间，或与所述第二开关管串联于所述第二并联连接点和第二连接点之间；所述第一采样桥中两个二极体的同极连接点与所述第二采样桥中两个二极体的同极连接点之间连接有呈串联连接的所述采样开关管和采样电阻；所述采样电阻与所述开关控制单元连接，当所述采样开关管以及第一开关管或第二开关管闭合时，所述电流采样单元对应的采集与该电流采样单元连接的第一开关管或第二开关管上流过的电流。 The primary winding is connected in series with the first switching tube to the first parallel connection point and the second connection Between the points, or in series with the second switch tube between the second parallel connection point and the second connection point; the same pole connection point of the two diodes in the first sampling bridge and the first The sampling switch tube and the sampling resistor connected in series are connected between the same pole connection points of the two diodes in the two sampling bridges; the sampling resistor is connected to the switch control unit, when the sampling switch tube and When the first switch tube or the second switch tube is closed, the current sampling unit correspondingly collects a current flowing on the first switch tube or the second switch tube connected to the current sampling unit.

3、如权利要求 1所述的***，其特征在于，所述电流采样单元包括：电流互感器，两个稳压二极管、两个二极体、采样开关管和采样电阻；所述电流互感器包括原边绕阻和连接于绕阻端点的两个副边绕阻； 3. The system according to claim 1, wherein the current sampling unit comprises: a current transformer, two Zener diodes, two diodes, a sampling switch tube, and a sampling resistor; the current transformer The primary side winding and the two secondary windings connected to the winding end point;

所述电流互感器的原边绕阻与所述第一开关管串联于所述第一并联连接点和第二连接点之间，或与所述第二开关管串联于所述第二并联连接点和第二连接点之间； The primary side winding of the current transformer is connected in series with the first switching tube between the first parallel connection point and the second connection point, or is connected in series with the second switching tube in the second parallel connection Between the point and the second connection point;

在所述两个副边绕阻中的第一副边绕阻的绕阻端点和另一端点之间，有呈串联连接的所述采样开关管、所述采样电阻及一个二极体；在所述两个副边绕阻的两个非绕阻端点之间，有呈同极串联连接的两个所述二极体，且并联有呈同极串联连接的两个所述稳压二极管； Between the winding end of the first secondary winding of the two secondary windings and the other end, the sampling switch tube, the sampling resistor and a diode are connected in series; Between the two non-restricted end points of the two secondary windings, there are two diodes connected in series in the same polarity, and two of the Zener diodes connected in series in the same polarity are connected in parallel;

所述采样电阻与所述开关控制单元连接，当所述采样开关管以及第一开关管或第二开关管闭合时，所述电流采样单元对应的采集与该电流采样单元连接的第一开关管或第二开关管上流过的电流。 The sampling resistor is connected to the switch control unit, and when the sampling switch tube and the first switch tube or the second switch tube are closed, the current sampling unit correspondingly collects the first switch tube connected to the current sampling unit Or the current flowing on the second switching tube.

4、如权利要求 1至 3任一项所述的***，其特征在于，所述开关管为绝缘栅型场效应管 Mosfet,或绝缘栅型双极型晶体管 IGBT，或双极结型晶体管 BJT。 The system according to any one of claims 1 to 3, wherein the switch tube is an insulated gate field effect transistor Mosfet, or an insulated gate bipolar transistor IGBT, or a bipolar junction transistor BJT .

5、如权利要求 2或 3所述的***，其特征在于，所述第一电流采样单元中的采样开关管与所述第一开关管的开关时序相同或相应； The system according to claim 2 or 3, wherein the sampling switch tube in the first current sampling unit has the same or corresponding switching timing as the first switching tube;

所述第二电流采样单元中的采样开关管与所述第二开关管的开关时序相同或相应。 The sampling switch tube in the second current sampling unit has the same or corresponding switching timing as the second switching tube.

6、一种电流采样装置，其特征在于，包括： 6. A current sampling device, comprising:

两个所述二极体同极串联成第一采样桥；另两个所述二极体同极串联成第二采样桥，所述第一采样桥和第二采样桥中，其中一个采样桥包括的二极体是同阳极相连，另一个采样桥包括的二极体是同阴极相连；且所述第一采样桥与第二采样桥分别与所述副边绕组的两端并联连接； Two of the diodes are connected in series to form a first sampling bridge; the other two of the diodes are connected in series with the same pole a second sampling bridge, wherein the first sampling bridge and the second sampling bridge, one sampling bridge includes a diode connected to the anode, and the other sampling bridge includes a diode connected to the cathode; a sampling bridge and a second sampling bridge are respectively connected in parallel with both ends of the secondary winding;

7、如权利要求 6权利要求所述的装置，其特征在于，所述采样开关管为绝缘栅型场效应管 Mosfet，或绝缘栅型双极型晶体管 IGBT，或双极结型晶体管 BJT。 The device according to claim 6, wherein the sampling switch tube is an insulated gate field effect transistor Mosfet, or an insulated gate bipolar transistor IGBT, or a bipolar junction transistor BJT.

8、一种电流采样装置，其特征在于，包括： 8. A current sampling device, comprising:

9、如权利要求 8权利要求所述的装置，其特征在于，所述采样开关管为绝缘栅型场效应管 Mosfet, 或绝缘栅型双极型晶体管 IGBT，或双极结型晶体管 BJT。 The device according to claim 8, wherein the sampling switch tube is an insulated gate field effect transistor Mosfet, or an insulated gate bipolar transistor IGBT, or a bipolar junction transistor BJT.