WO2017031880A1 - 一种光耦隔离车载电源光伏逆变器的控制方法 - Google Patents

一种光耦隔离车载电源光伏逆变器的控制方法 Download PDF

Info

Publication number
WO2017031880A1
WO2017031880A1 PCT/CN2015/098402 CN2015098402W WO2017031880A1 WO 2017031880 A1 WO2017031880 A1 WO 2017031880A1 CN 2015098402 W CN2015098402 W CN 2015098402W WO 2017031880 A1 WO2017031880 A1 WO 2017031880A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
switching
freewheeling
switching circuit
optocoupler
Prior art date
Application number
PCT/CN2015/098402
Other languages
English (en)
French (fr)
Inventor
尤为
Original Assignee
无锡伊佩克科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 无锡伊佩克科技有限公司 filed Critical 无锡伊佩克科技有限公司
Publication of WO2017031880A1 publication Critical patent/WO2017031880A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H02M1/092—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices the control signals being transmitted optically
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Definitions

  • the invention relates to a control method for an optocoupler isolated vehicle power supply photovoltaic inverter, belonging to a direct current/alternating current (DC/AC) electric energy conversion device.
  • DC/AC direct current/alternating current
  • Inverters are widely used in motor drives, uninterruptible power supplies, induction heating, static var generators and compensators, and active filtering.
  • Traditional inverter circuit topologies include voltage source inverters and current source inverters.
  • the output source voltage of the voltage source inverter is lower than the DC bus voltage, so the voltage source inverter is essentially a step-down inverter.
  • an additional boost converter circuit is required.
  • the overall structure of the converter is complicated.
  • the current source inverter is essentially a step-up inverter.
  • an additional step-down conversion circuit is required, resulting in a complicated overall structure of the converter; the current source inverter can only implement a single To power transmission, energy cannot flow in both directions.
  • the scholar proposed the concept of the Z source inverter, and coupled the main circuit of the inverter with the power source by introducing a Z source network.
  • Z-source inverters can provide the function of buck-boost conversion, but also can not achieve bidirectional transmission of energy, and introduce additional passive components composed of inductors and capacitors. Increased system size, weight and implementation cost while controlling complexity.
  • some modified Z-source inverter circuits have been proposed, and the essence is to implement boosting by introducing passive components. All of the above problems exist.
  • Inverter is a kind of AC220V AC that can convert DC12V DC to the same as the mains. It is a convenient power converter. It is named for its use in automobiles.
  • DC/DC DC converter power supply usually convert 12VDC or 24VDC of car battery into DC power such as 48VDC for electrical equipment on the car.
  • the vehicle power supply is not only suitable for in-vehicle systems. As long as there is a DC12V DC power supply, the power inverter can be used to convert DC12V to AC220V AC, which brings convenience to people's lives.
  • the vehicle power supply fully takes into account the external use environment, and will automatically protect the shutdown when an overload or short circuit occurs.
  • the output voltage of the vehicle power supply can be stabilized by its own feedback confirmation, and the no-load and rated voltage values change less than 10V.
  • the purpose of the vehicle power supply is to output the same voltage as the mains, to meet the needs of the electrical appliances, but in fact the vehicle power supply outputs an analog sine wave, and the commercial power is a true sine wave, which is slightly different. , generally does not affect the use, this is the car battery
  • the working principle of the source is determined.
  • the existing photovoltaic grid-connected inverters mainly include:
  • Isolated grid-connected inverter which mainly uses the isolation transformer to electrically insulate the DC side and the AC side. Although the inverter does not have the common mode current (leakage current), etc., it is safe and EMC. The problem, but the cost is high and the power conversion efficiency is low.
  • Non-isolated grid-connected inverters improve power conversion efficiency by omitting isolation transformers. However, since there is no electrical insulation on the DC side and the AC side, and parasitic capacitance between the PV array and the ground, a common mode current is generated, which increases electromagnetic radiation and safety hazards. To this end, efforts should be made to suppress common mode currents in non-isolated photovoltaic grid-tied inverters.
  • the technical problem to be solved by the present invention is to provide a control method for an optocoupler-isolated vehicle-mounted power source photovoltaic inverter, which solves the problem that the vehicle-mounted power switch malfunctions easily and is short-circuited in the prior art.
  • a control method for an optocoupler-isolated vehicle-mounted power supply photovoltaic inverter includes first to fourth switching circuits, first to second filter inductors, one storage capacitor, and first to second freewheel circuits
  • the first switch circuit and the third switch circuit are respectively connected to the positive input of the photovoltaic inverter, and the second switch circuit and the fourth switch circuit are respectively connected to the negative terminal of the input end of the photovoltaic inverter, and the first switch circuit
  • a first freewheeling circuit is connected to the second switching circuit, and a second freewheeling circuit is connected between the third switching circuit and the fourth switching circuit.
  • the control terminal of the switching circuit is connected to the optocoupler isolation circuit, and the following steps are included:
  • Step 1 In the positive half cycle of the output current, the third switching circuit, the fourth switching circuit, and the second freewheeling circuit are always kept in an off state, and the first freewheeling circuit is always kept in an on state; the optocoupler isolating circuit is controlled a switching circuit and a second switching circuit are in a synchronous conduction state, and are opposite to the control signals of the third switching circuit and the fourth switching circuit;
  • Step 2 controlling the first switching circuit, the second switching circuit, and the first freewheeling circuit to remain in an off state at the negative half cycle of the output current, and controlling the second freewheeling circuit to remain in an on state at all times; controlling the optocoupler isolation circuit and The third switch circuit and the fourth switch circuit are in a synchronous conduction state, and are opposite to the control signals of the first switch circuit and the second switch circuit;
  • Step 3 Repeat steps 1 through 2.
  • the optocoupler isolation circuit includes a photocoupler, a filter circuit, a pull-up resistor, and a current limiting resistor
  • the photocoupler includes a first input end, a second input end, a first output end, and a second output end, wherein The first input end is connected to the external DC power source through the current limiting resistor, the second input end is connected to the signal output pin of the external control chip, and the first output end is divided into two paths, and one of the paths is connected to the external second DC power source through the pull-up resistor.
  • the other circuit is connected to the control end of the switch tube, the second output end is grounded, and a filter circuit is connected between the second DC power source and the ground.
  • the filter circuit includes three filter capacitors of different capacitance values connected in parallel, and each filter capacitor There is at least an order of magnitude difference between them.
  • the freewheeling circuit is connected in series by a freewheeling switching device and a freewheeling diode, wherein the freewheeling diode is a reverse diode.
  • the switching circuit includes a switching transistor including a MOS transistor, a triode or a JFET.
  • a reverse diode is connected in parallel between the input end and the output end of the MOS transistor, the triode or the JFET.
  • the present invention has the following beneficial effects:
  • the freewheeling circuit of the device of the present invention is disconnected from the DC side during freewheeling, suppressing common mode current, and has no problem of energy exchange between the filter inductor and the storage capacitor, preventing parasitic factors in the inductor and the capacitor component. Cause additional losses.
  • the filter inductor uses a coupled inductor, which effectively suppresses ripple, reduces the impact of device damage on the circuit, and avoids short circuits.
  • FIG. 1 is a circuit schematic diagram of an inverter of the present invention.
  • FIG. 2 is a schematic diagram of an optocoupler isolation circuit of the present invention.
  • a control method for an optocoupler-isolated vehicle-mounted power supply photovoltaic inverter includes first to fourth switching circuits, first to second filter inductors, one storage capacitor, and first to second freewheel circuits
  • the first switch circuit and the third switch circuit are respectively connected to the positive input of the photovoltaic inverter, and the second switch circuit and the fourth switch circuit are respectively connected to the negative terminal of the input end of the photovoltaic inverter, and the first switch circuit
  • a first freewheeling circuit is connected to the second switching circuit, and a second freewheeling circuit is connected between the third switching circuit and the fourth switching circuit.
  • the control terminal of the switching circuit is connected to the optocoupler isolation circuit, and the following steps are included:
  • Step 1 In the positive half cycle of the output current, the third switching circuit, the fourth switching circuit, and the second freewheeling circuit are always kept in an off state, and the first freewheeling circuit is always kept in an on state; the optocoupler isolating circuit is controlled a switching circuit and a second switching circuit are in a synchronous conduction state, and are opposite to the control signals of the third switching circuit and the fourth switching circuit;
  • Step 2 controlling the first switching circuit, the second switching circuit, and the first freewheeling circuit to remain in an off state at the negative half cycle of the output current, and controlling the second freewheeling circuit to remain in an on state at all times; controlling the optocoupler isolation circuit and The third switch circuit and the fourth switch circuit are in a synchronous conduction state, and are opposite to the control signals of the first switch circuit and the second switch circuit;
  • Step 3 Repeat steps 1 through 2.
  • the switching devices S3, S4, and the freewheeling device S6 are always turned off, and the freewheeling device S5 is always turned on.
  • the switching devices S1 and S2 are turned on, the current flows from the DC power source Vin, and is sequentially closed by the switching device S1, the node C, the filter inductor L1, the AC side load Vac, the node E, and the switching device S2 back to the DC power source Vin.
  • the positive half cycle of the output current is output from the AC side load Vac.
  • the switching devices S1 and S2 are turned off, the current flows through the freewheeling switch S5, the freewheeling diode D5, the node C, and the node E are the alternating current side load Vac for freewheeling.
  • the switching devices S1, S2, and the freewheeling device S5 are always turned off, and the freewheeling device S6 is always turned on.
  • the switching devices S3 and S4 are turned on, the current flows from the DC power source Vin, and the closed circuit is formed by the switching device S3, the node D, the filter inductor L2, the AC side load Vac, the node F, and the switching device S4 returning to the DC power source Vin.
  • the negative half cycle of the output current is output from the AC side load Vac.
  • the switching devices S3, S4 are turned off, The current passes through the freewheeling switch S6, the freewheeling diode D6, the node D, and the node F are the alternating current side load Vac for freewheeling.
  • the vehicle-mounted power supply photovoltaic inverter and the optocoupler isolation circuit of the present invention are as shown in FIG. 1 and FIG. 2, and the on-vehicle power supply photovoltaic inverter includes first to fourth switch circuits S1 to S4 and first to second filter inductors.
  • a storage capacitor C1 first to second freewheeling circuits D5, D6, wherein the first switching circuit and the third switching circuit are respectively connected to the positive terminal of the photovoltaic inverter input to form a node 1 and a second switch
  • the circuit and the fourth switching circuit are respectively connected to the negative terminal of the input end of the photovoltaic inverter to form a node 2;
  • a first freewheeling circuit is connected between the first switching circuit and the second switching circuit, and an input end of the first freewheeling circuit Connected with the second switch circuit to form a node E, the output end of the first freewheel circuit is connected with the first switch circuit to form a node C;
  • the second switch circuit is connected with the fourth switch circuit to connect the second freewheel circuit, and the second The input end of the freewheeling circuit is connected with the fourth switching circuit to form a node F, and the output end of the second freewheeling circuit is connected with the third switching circuit to form a node D;
  • the second filter inductor includes a third winding L3 and a fourth winding L4.
  • One end of the first winding is connected to the node C, and the other end is respectively connected to one end of the second winding and the node F.
  • the other end of the second winding is connected as an output end of the inverter to one end of the load Vac;
  • one end of the fourth winding is connected to the node D, and the other end is connected to one end of the third winding and the node E,
  • the other end of the three windings is connected as the other output of the inverter to the other end of the load Vac;
  • the storage capacitor is connected between the positive and negative terminals of the input end of the photovoltaic inverter;
  • the four switching circuits are High frequency signal control, freewheeling circuit controlled by low frequency signal.
  • the freewheeling circuit of the device of the invention is disconnected from the DC side during freewheeling, suppressing the common mode current, and has no problem of energy exchange between the filter inductor and the storage capacitor, preventing the parasitic factors in the inductor and the capacitor component from causing additional Loss.
  • the freewheeling circuit is connected in series by a freewheeling switching device and a freewheeling diode, wherein the freewheeling diode is a reverse diode.
  • the high frequency signal is a PWM signal
  • the low frequency signal is a signal outputting the same frequency as the inverter.
  • the switching circuit includes a switching transistor including a MOS transistor, a triode or a JFET.
  • a reverse diode D1 - D4 is connected in parallel between the input end and the output end of the MOS transistor, the triode or the JFET.
  • the optocoupler isolation circuit includes a photocoupler Q10, a filter circuit, a pull-up resistor R2, and a current limiting resistor R1.
  • the photocoupler includes a first input end, a second input end, a first output end, and a second output end.
  • the first input end is connected to the external DC power supply through the current limiting resistor R1
  • the second input end is connected to the signal output pin of the external control chip
  • the first output end is divided into two paths, one through the pull-up resistor R2 and the external first
  • the second DC power supply is connected, the other is connected to the control end of the switch tube, the second output end is grounded, and the filter circuit is connected between the second DC power source and the ground, and the filter circuit includes three filter capacitors of different capacitance values connected in parallel. They are C1, C2, and C3, respectively, and each filter capacitor differs by at least one order of magnitude.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

一种光耦隔离车载电源光伏逆变器的控制方法，逆变器包括第一至第四开关电路（S1、S2、S3、S4）、开关电路的控制端连接光耦隔离电路；在输出电流的正半周，控制第三开关电路、第四开关电路、第二续流电路（S6、D6）始终保持关断状态，控制第一续流电路（S5、D5）始终保持导通状态，控制光耦隔离电路保持与第一、第二开关电路处于同步导通状态；在输出电流的负半周，控制第一开关电路、第二开关电路、第一续流电路始终保持关断状态，控制第二续流电路始终保持导通状态，控制光耦隔离电路保持与第三、第四开关电路处于同步导通状态。该方法减小了开关损耗，并降低了导通损耗。

Description

一种光耦隔离车载电源光伏逆变器的控制方法 技术领域
本发明涉及一种光耦隔离车载电源光伏逆变器的控制方法，属于直流/交流(DC/AC)电能转换装置。
背景技术
逆变器广泛应用于电机驱动，不间断供电电源，感应加热，静态无功发生器和补偿器以及有源滤波等场合。传统的逆变器电路拓扑包括电压源逆变器和电流源逆变器两类。
电压源逆变器的输出交流电压低于直流母线电压，因此电压源逆变器本质上是一个降压型逆变器，为了实现升压变换的功能，需要额外增加一级升压变换电路，导致变换器整体结构复杂。
电流源逆变器本质上是一个升压型逆变器，为了实现降压变换的功能，需要额外增加一级降压变换电路，导致变换器整体结构复杂；电流源逆变器只能实现单向功率传输，能量不能双向流动。
为了解决电压源逆变器和电流源逆变器存在的上述问题，学者提出了Z源逆变器的概念，通过引入一个Z源网络将逆变器主电路与电源耦合起来。与电压源和电流源逆变器相比，Z源逆变器能够提供升降压变换的功能，但同样不能实现能量的双向传输，同时引入了额外的由电感，电容组成的无源元件，增加了系统的体积，重量和实现成本，同时控制复杂。国内外又在此基础上陆续提出了一些改型的Z源逆变器电路，其本质都是通过引入无源元件来实现升压，都存在上述问题。
车载电源有类型，1.逆变器，是一种能够将DC12V直流电转换为和市电相同的AC220V交流电，供一般电器使用，是一种方便的电源转换器，由于常用于汽车而得名。2.DC/DC直流变换器电源,通常是把汽车电池的12VDC或24VDC转变为48VDC等直流电给汽车上的电器设备用。
车载电源不仅适用于车载系统，只要有DC12V直流电源的场合，都可使用电源逆变器，将DC12V转换为AC220V交流电，给人们的生活带来方便。车载电源充分考虑到外部的使用环境，当发生过载或短路现象时将自动保护关机。车载电源的输出电压通过本身的反馈确认可以使电压稳定，空载与额定的电压值变化小于10V。需要说明的是，车载电源的目的是输出和市电相同的电压，满足用电器的需要，但实际上车载电源输出的是模拟正弦波，而市电是真正的正弦波，两者略有不同，一般不影响使用，这是车载电 源的工作原理决定的。
现有的光伏并网逆变器主要有：
1)隔离型并网逆变器，主要是通过使用隔离变压器将直流侧和交流侧进行电气绝缘，这种逆变器虽然不存在共模电流(漏电流)等带来的安全上和EMC等的问题，但是成本高，电能变换效率低。
2)非隔离并网逆变器，通过省略隔离变压器来提高电能变换效率。但是由于直流侧和交流侧没有电气绝缘，以及光伏阵列和地之间存在寄生电容，会产生共模电流，这便增加了电磁辐射和安全隐患。为此应设法抑制非隔离型光伏并网逆变器中的共模电流。
缺点：能量输出时，电流输出的正负半周均需通过3个器件S5、S1、S4或S5、S3、S2,这样增加了器件的导通损耗。另外，可能会发生开关器件故障引起的桥臂短路，而这个短路途径没有任何阻抗，会在极短的时间能产生非常大的短路电流，有引起电路损坏的危险。
发明内容
本发明所要解决的技术问题是：提供一种光耦隔离车载电源光伏逆变器的控制方法，解决了现有技术中车载电源开关发生故障容易短路的问题。
本发明为解决上述技术问题采用以下技术方案：
一种光耦隔离车载电源光伏逆变器的控制方法，所述逆变器包括第一至第四开关电路、第一至第二滤波电感、一个储能电容、第一至第二续流电路，其中第一开关电路与第三开关电路分别与所述光伏逆变器输入端正极连接，第二开关电路与第四开关电路分别与所述光伏逆变器输入端负极连接，第一开关电路与第二开关电路之间连接第一续流电路，第三开关电路与第四开关电路之间连接第二续流电路，所述开关电路的控制端连接光耦隔离电路，包括如下步骤：
步骤1、在输出电流的正半周，控制第三开关电路、第四开关电路、第二续流电路始终保持关断状态，第一续流电路始终保持导通状态；控制光耦隔离电路与第一开关电路、第二开关电路处于同步导通状态，且与第三开关电路、第四开关电路的控制信号反向；
步骤2、在输出电流的负半周，控制第一开关电路、第二开关电路、第一续流电路始终保持关断状态，控制第二续流电路始终保持导通状态；控制光耦隔离电路与第三开关电路、第四开关电路处于同步导通状态，且与第一开关电路、第二开关电路的控制信号反向；
步骤3、重复执行步骤1至步骤2。
所述光耦隔离电路包括光电耦合器、滤波电路、上拉电阻、限流电阻，所述光电耦合器包括第一输入端、第二输入端、第一输出端、第二输出端，其中，第一输入端通过限流电阻与外部直流电源连接，第二输入端与外部控制芯片的信号输出脚连接，第一输出端分为两路，一路通过上拉电阻与外部第二直流电源连接，另一路连接开关管的控制端，第二输出端接地，第二直流电源与地之间连接滤波电路，所述滤波电路包括并联连接的三个容值不相等的滤波电容，且每个滤波电容之间至少相差一个数量级。
所述续流电路由续流开关器件和续流二极管串联连接，其中续流二极管为反向二极管。
所述开关电路包括开关管，所述开关管包括MOS管、三极管或JFET。
所述MOS管、三极管或JFET的输入端和输出端之间并联一个反向二极管。
与现有技术相比，本发明具有以下有益效果：
1、应用该方法控制只有两个开关器件同时进行高频开关，减小了开关损耗；能量输出时电流只流过两个器件，降低了导通损耗，同时同步控制光耦隔离电路的通断，有效控制了逆变器的控制信号的稳定性。
2、本发明装置续流回路在续流时与直流侧断开，抑制了共模电流，而且没有滤波电感和储能电容之间的能量交换的问题，防止了电感与电容器件中的寄生因素引起额外的损耗。
3、输入电压变化范围大。滤波电感采用耦合电感，使得能够有效抑制纹波，减少器件损坏对电路造成的冲击，避免短路。
4、拓扑简单，效率高，可靠性高。
5、在桥臂中增加反向二级管，开关器件出现故障时，不容易发生桥臂短路，增强了电路的可靠性。
附图说明
图1为本发明逆变器的电路原理图。
图2为本发明光耦隔离电路的原理图。
具体实施方式
下面对本发明的结构及工作过程作进一步说明。
本技术领域技术人员可以理解的是，除非另外定义，这里使用的所有术语(包括技术术语和科学术语)具有与本发明所属领域中的普通技术人员的一般理解相同的意义。还应该理解的是，诸如通用字典中定义的那些术语应该被理解为具有与现有技术的上下文中的意义一致的意义，并且除非像这里一样定义，不会用理想化或过于正式的含义来解释。
一种光耦隔离车载电源光伏逆变器的控制方法，所述逆变器包括第一至第四开关电路、第一至第二滤波电感、一个储能电容、第一至第二续流电路，其中第一开关电路与第三开关电路分别与所述光伏逆变器输入端正极连接，第二开关电路与第四开关电路分别与所述光伏逆变器输入端负极连接，第一开关电路与第二开关电路之间连接第一续流电路，第三开关电路与第四开关电路之间连接第二续流电路，所述开关电路的控制端连接光耦隔离电路，包括如下步骤：
步骤1、在输出电流的正半周，控制第三开关电路、第四开关电路、第二续流电路始终保持关断状态，第一续流电路始终保持导通状态；控制光耦隔离电路与第一开关电路、第二开关电路处于同步导通状态，且与第三开关电路、第四开关电路的控制信号反向；
步骤2、在输出电流的负半周，控制第一开关电路、第二开关电路、第一续流电路始终保持关断状态，控制第二续流电路始终保持导通状态；控制光耦隔离电路与第三开关电路、第四开关电路处于同步导通状态，且与第一开关电路、第二开关电路的控制信号反向；
步骤3、重复执行步骤1至步骤2。
假设电流从结点A流出为输出电流的正半周，电流从结点B点流出为输出电流的负半周。
i.在输出电流的正半周，开关器件S3、S4、续流器件S6始终保持关断，续流器件S5始终保持导通。当开关器件S1、S2导通时，电流从直流电源Vin流出，依次通过开关器件S1、结点C、滤波电感L1、交流侧负载Vac、结点E、开关器件S2回到直流电源Vin组成闭合回路，输出电流的正半周从交流侧负载Vac输出。当开关器件S1、S2关断时，电流经过续流开关S5，续流二极管D5、结点C、结点E为交流侧负载Vac进行续流。
ii.在输出电流的负半周，开关器件S1、S2、续流器件S5始终保持关断，续流器件S6始终保持导通。当开关器件S3、S4导通时，电流从直流电源Vin流出，通过开关器件S3、结点D、滤波电感L2、交流侧负载Vac、结点F、开关器件S4回到直流电源Vin组成闭合回路，输出电流的负半周从交流侧负载Vac输出。当开关器件S3、S4关断时， 电流经过续流开关S6，续流二极管D6、结点D、结点F为交流侧负载Vac进行续流。
本发明的车载电源光伏逆变器和光耦隔离电路如图1、图2所示，所述车载电源光伏逆变器，包括第一至第四开关电路S1～S4、第一至第二滤波电感、一个储能电容C1、第一至第二续流电路D5、D6，其中第一开关电路与第三开关电路分别与所述光伏逆变器输入端正极连接，形成结点1，第二开关电路与第四开关电路分别与所述光伏逆变器输入端负极连接，形成结点2；第一开关电路与第二开关电路之间连接第一续流电路，第一续流电路的输入端与第二开关电路连接形成结点E，第一续流电路的输出端与第一开关电路连接形成结点C；第三开关电路与第四开关电路之间连接第二续流电路，第二续流电路的输入端与第四开关电路连接形成结点F，第二续流电路的输出端与第三开关电路连接形成结点D；第一滤波电感和第二滤波电感均为耦合电感，其中，第一滤波电感包括第一绕组L1和第二绕组L2，第二滤波电感包括第三绕组L3和第四绕组L4，第一绕组的一端与结点C连接，另一端分别与第二绕组的一端、结点F连接，第二绕组的另一端作为所述逆变器的一个输出端与负载Vac一端连接；第四绕组的一端与结点D连接,另一端与第三绕组的一端、结点E连接，第三绕组的另一端作为所述逆变器的另一个输出端与负载Vac另一端连接；所述储能电容跨接在光伏逆变器输入端的正负极之间；所述四个开关电路受高频信号控制，续流电路受低频信号控制。
本发明装置续流回路在续流时与直流侧断开，抑制了共模电流，而且没有滤波电感和储能电容之间的能量交换的问题，防止了电感与电容器件中的寄生因素引起额外的损耗。
所述续流电路由续流开关器件和续流二极管串联连接，其中续流二极管为反向二极管。
所述高频信号为PWM信号，低频信号为与逆变器输出相同频率的信号。
所述开关电路包括开关管，所述开关管包括MOS管、三极管或JFET。
所述MOS管、三极管或JFET的输入端和输出端之间并联一个反向二极管D1～D4。
所述光耦隔离电路包括光电耦合器Q10、滤波电路、上拉电阻R2、限流电阻R1，所述光电耦合器包括第一输入端、第二输入端、第一输出端、第二输出端，其中，第一输入端通过限流电阻R1与外部直流电源连接，第二输入端与外部控制芯片的信号输出脚连接，第一输出端分为两路，一路通过上拉电阻R2与外部第二直流电源连接，另一路连接开关管的控制端，第二输出端接地，第二直流电源与地之间连接滤波电路，所述滤波电路包括并联连接的三个容值不相等的滤波电容，分别为C1、C2、C3，且每个滤波电容之间至少相差一个数量级。
以上所述仅是本发明的部分实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (5)

  1. 一种光耦隔离车载电源光伏逆变器的控制方法，所述逆变器包括第一至第四开关电路、第一至第二滤波电感、一个储能电容、第一至第二续流电路，其中第一开关电路与第三开关电路分别与所述光伏逆变器输入端正极连接，第二开关电路与第四开关电路分别与所述光伏逆变器输入端负极连接，第一开关电路与第二开关电路之间连接第一续流电路，第三开关电路与第四开关电路之间连接第二续流电路，所述开关电路的控制端连接光耦隔离电路，其特征在于：包括如下步骤：
    步骤1、在输出电流的正半周，控制第三开关电路、第四开关电路、第二续流电路始终保持关断状态，第一续流电路始终保持导通状态；控制光耦隔离电路与第一开关电路、第二开关电路处于同步导通状态，且与第三开关电路、第四开关电路的控制信号反向；
    步骤2、在输出电流的负半周，控制第一开关电路、第二开关电路、第一续流电路始终保持关断状态，控制第二续流电路始终保持导通状态；控制光耦隔离电路与第三开关电路、第四开关电路处于同步导通状态，且与第一开关电路、第二开关电路的控制信号反向；
    步骤3、重复执行步骤1至步骤2。
  2. 根据权利要求1所述的光耦隔离车载电源光伏逆变器的控制方法，其特征在于：所所述光耦隔离电路包括光电耦合器、滤波电路、上拉电阻、限流电阻，所述光电耦合器包括第一输入端、第二输入端、第一输出端、第二输出端，其中，第一输入端通过限流电阻与外部直流电源连接，第二输入端与外部控制芯片的信号输出脚连接，第一输出端分为两路，一路通过上拉电阻与外部第二直流电源连接，另一路连接开关管的控制端，第二输出端接地，第二直流电源与地之间连接滤波电路，所述滤波电路包括并联连接的三个容值不相等的滤波电容，且每个滤波电容之间至少相差一个数量级。
  3. 根据权利要求1所述的光耦隔离车载电源光伏逆变器的控制方法，其特征在于：所述续流电路由续流开关器件和续流二极管串联连接，其中续流二极管为反向二极管。
  4. 根据权利要求1所述的光耦隔离车载电源光伏逆变器的控制方法，其特征在于：所述开关电路包括开关管，所述开关管包括MOS管、三极管或JFET。
  5. 根据权利要求4所述的光耦隔离车载电源光伏逆变器的控制方法，其特征在于：所述MOS管、三极管或JFET的输入端和输出端之间并联一个反向二极管。
PCT/CN2015/098402 2015-08-27 2015-12-23 一种光耦隔离车载电源光伏逆变器的控制方法 WO2017031880A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510531668.3 2015-08-27
CN201510531668.3A CN105119513A (zh) 2015-08-27 2015-08-27 一种光耦隔离车载电源光伏逆变器的控制方法

Publications (1)

Publication Number Publication Date
WO2017031880A1 true WO2017031880A1 (zh) 2017-03-02

Family

ID=54667434

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/098402 WO2017031880A1 (zh) 2015-08-27 2015-12-23 一种光耦隔离车载电源光伏逆变器的控制方法

Country Status (2)

Country Link
CN (1) CN105119513A (zh)
WO (1) WO2017031880A1 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107994798A (zh) * 2018-01-11 2018-05-04 福州大学 一种含在线故障诊断的双向双buck逆变器及其工作方法
CN112881937A (zh) * 2021-01-27 2021-06-01 阳光电源股份有限公司 一种直流电源供电系统的安全检测装置及方法
CN113659862A (zh) * 2021-08-26 2021-11-16 东南大学 一种光伏和储能一体的功率变换器拓扑及其控制方法
CN114050811A (zh) * 2022-01-13 2022-02-15 杭州禾迈电力电子股份有限公司 一种多输入关断器及控制方法、光伏发电系统

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105119513A (zh) * 2015-08-27 2015-12-02 无锡伊佩克科技有限公司 一种光耦隔离车载电源光伏逆变器的控制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2584692A2 (de) * 2011-10-21 2013-04-24 Diehl AKO Stiftung & Co. KG Wechselrichter mit asymmetrischem Betrieb der Drosseln
CN103178734A (zh) * 2013-03-08 2013-06-26 沃太能源南通有限公司 一种光伏逆变器
CN103338545A (zh) * 2013-01-12 2013-10-02 华南理工大学 一种日光灯调光电路及其工作方法
CN105119513A (zh) * 2015-08-27 2015-12-02 无锡伊佩克科技有限公司 一种光耦隔离车载电源光伏逆变器的控制方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7327178B2 (en) * 2005-09-30 2008-02-05 Honeywell International, Inc. Timing control circuit for lossless switching converter
CN201656768U (zh) * 2009-12-14 2010-11-24 浙江大学 耦合电感实现高增益倍压升压型变换器
CN101741240B (zh) * 2009-12-30 2011-11-30 广东易事特电源股份有限公司 一种双向dc/dc变换器的拓扑结构及变换器
CN101741273B (zh) * 2009-12-30 2012-07-25 扬州大学 光伏发电系统中耦合电感式双Boost逆变器电路
CN203734532U (zh) * 2013-12-25 2014-07-23 四川新力光源股份有限公司 用于led驱动器的斩波功能电路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2584692A2 (de) * 2011-10-21 2013-04-24 Diehl AKO Stiftung & Co. KG Wechselrichter mit asymmetrischem Betrieb der Drosseln
CN103338545A (zh) * 2013-01-12 2013-10-02 华南理工大学 一种日光灯调光电路及其工作方法
CN103178734A (zh) * 2013-03-08 2013-06-26 沃太能源南通有限公司 一种光伏逆变器
CN105119513A (zh) * 2015-08-27 2015-12-02 无锡伊佩克科技有限公司 一种光耦隔离车载电源光伏逆变器的控制方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107994798A (zh) * 2018-01-11 2018-05-04 福州大学 一种含在线故障诊断的双向双buck逆变器及其工作方法
CN107994798B (zh) * 2018-01-11 2024-03-12 福州大学 一种含在线故障诊断的双向双buck逆变器及其工作方法
CN112881937A (zh) * 2021-01-27 2021-06-01 阳光电源股份有限公司 一种直流电源供电系统的安全检测装置及方法
CN112881937B (zh) * 2021-01-27 2022-07-12 阳光电源股份有限公司 一种直流电源供电系统的安全检测装置及方法
CN113659862A (zh) * 2021-08-26 2021-11-16 东南大学 一种光伏和储能一体的功率变换器拓扑及其控制方法
CN114050811A (zh) * 2022-01-13 2022-02-15 杭州禾迈电力电子股份有限公司 一种多输入关断器及控制方法、光伏发电系统

Also Published As

Publication number Publication date
CN105119513A (zh) 2015-12-02

Similar Documents

Publication Publication Date Title
CN110677060B (zh) 功率变换系统及其中直流母线电容的预充电方法
JP4322250B2 (ja) トランスレス型系統連係電力変換回路
WO2017031880A1 (zh) 一种光耦隔离车载电源光伏逆变器的控制方法
US20170324329A1 (en) Dc-dc converter with high transformer ratio
US10396676B2 (en) Bidirectional DC-DC converter and control method therefor
CN105958816B (zh) 一种多单元二极管电容网络和耦合电感高增益直流变换器
CN105141019A (zh) 一种电动汽车充电系统
US20180159435A1 (en) Modified dual active half bridge dc/dc converter with transformer dc bias
CN205725513U (zh) 一种单相ac‑dc/dc‑ac双用电路及三相ac‑dc/dc‑ac双用电路
CN105871244A (zh) 一种单相ac-dc/ dc-ac双用电路及三相ac-dc/ dc-ac双用电路
EP2882090A1 (en) Single-phase fullbridge inverter with switchable output filter
Bharatiraja et al. Analysis, design and investigation on a new single-phase switched quasi Z-source inverter for photovoltaic application
CN114175481B (zh) 电力转换系统的dc-dc转换器
CN103178734A (zh) 一种光伏逆变器
CN205622509U (zh) 具有电能双向传输功能的机车车辆直流电压变换器
Fang et al. Bidirectional power flow Z-source dc-dc converter
CN204967650U (zh) 一种单级可升降压车载电源逆变器
CN108233756B (zh) 一种单输入双接地半桥逆变器及其控制方法
US20220190742A1 (en) Novel fws dc-ac grid connected inverter
CN204967656U (zh) 一种车载电源逆变器
Jayalakshmi et al. Control of Single Phase Z-Source Inverter Fed Induction Motor Using Simple Boost Controller
CN105141160A (zh) 一种车载电源光伏逆变器
CN105141157A (zh) 一种单级可升降压车载电源逆变器
CN105262091A (zh) 一种车载电源光伏逆变器的控制方法
WO2023272574A1 (zh) 一种光伏系统、快速关断方法及光伏逆变器

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15902148

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 22/08/2018)

122 Ep: pct application non-entry in european phase

Ref document number: 15902148

Country of ref document: EP

Kind code of ref document: A1