CN106849731A - A kind of control method of buck-boost grid-connected inverter - Google Patents
A kind of control method of buck-boost grid-connected inverter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M7/5387—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 in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M7/539—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 with automatic control of output wave form or frequency
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- 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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
本发明公布了一种升降压并网逆变器的控制方法，属逆变器控制方法。本发明的升降压并网逆变器包括输入电源、第一滤波电感、第二滤波电感、第一开关管、第二开关管、第五开关管、第六开关管、第一开关单元、第二开关单元、滤波电路和电网。本发明的控制方法为：第三开关管和第六开关管驱动相同，第四开关管和第五开关管驱动相同；在电网电压负半周，第一开关管调制，第四开关管常通；在电网电压正半周，第二开关管调制，第三开关管常通。本发明的升降压并网逆变器没有桥式逆变器桥臂的功率管直通问题，提高了可靠性；各开关管无需设死区时间，提高了电网电流的波形质量；可实现单级升降压变换；只需2个二极管；导通支路串联的管子少，效率高。
The invention discloses a control method for a buck-boost grid-connected inverter, which belongs to an inverter control method. The buck-boost grid-connected inverter of the present invention includes an input power supply, a first filter inductor, a second filter inductor, a first switch tube, a second switch tube, a fifth switch tube, a sixth switch tube, a first switch unit, A second switch unit, a filter circuit and a grid. The control method of the present invention is as follows: the driving of the third switching tube and the sixth switching tube are the same, and the driving of the fourth switching tube and the fifth switching tube are the same; in the negative half cycle of the grid voltage, the first switching tube is modulated, and the fourth switching tube is normally on; In the positive half cycle of the grid voltage, the second switching tube is modulated, and the third switching tube is normally on. The buck-boost grid-connected inverter of the present invention does not have the power tube direct-through problem of the bridge arm of the bridge inverter, which improves reliability; each switching tube does not need to set a dead time, which improves the waveform quality of the grid current; Step-up and step-down conversion; only 2 diodes are needed; there are few tubes connected in series in the conduction branch, and the efficiency is high.
Description
技术领域technical field
本发明涉及一种逆变器的控制方法，尤其是一种升降压并网逆变器的控制方法。The invention relates to a control method of an inverter, in particular to a control method of a buck-boost grid-connected inverter.
背景技术Background technique
随着环境污染的日益加剧和化石能源的不断紧缺，燃料电池、风能和太阳能等可再生能源由于具有清洁安全、无污染、可再生等优点而越来越受到人们的关注。但太阳能电池和燃料电池等的输出为直流电，而电网电压为交流电，因此，并网逆变器成为分布式发电系统和微电网的重要组成部分。又由于太阳能电池和燃料电池等的输出电压范围宽，有时低于电网电压，有时高于电网电压，因此，采用传统的单级降压型逆变器无法实现，通常需要再加一个前级DC-DC变换器，从而提高了系统的复杂性，降低了可靠性，增加了系统的成本。With the increasing environmental pollution and the continuous shortage of fossil energy, renewable energy sources such as fuel cells, wind energy, and solar energy have attracted more and more attention due to their advantages of cleanness, safety, pollution-free, and renewable. However, the output of solar cells and fuel cells is DC, while the grid voltage is AC. Therefore, grid-connected inverters become an important part of distributed power generation systems and micro-grids. And because the output voltage range of solar cells and fuel cells is wide, sometimes it is lower than the grid voltage, sometimes it is higher than the grid voltage. Therefore, it cannot be realized by using a traditional single-stage step-down inverter, and it is usually necessary to add a pre-stage DC -DC converter, which increases the complexity of the system, reduces the reliability and increases the cost of the system.
公开文献(CN 102005962 B)公开的升降压并网逆变器及其控制方法，实现了单级升降压变换的功能，具有高的可靠性；公开文献(CN 103219912 B)公开的一种适合宽输入电压升降压并网逆变器的控制方法，在公开文献(CN 102005962 B)主电路拓扑的基础上，提出了一种新的控制方法，可工作在升降压和降压两种模式。但上述公开文献存在如下问题：需要4个二极管，成本较高；开关损耗和导通损耗高，效率低，不利于推广应用。The buck-boost grid-connected inverter and its control method disclosed in the public document (CN 102005962 B) realize the function of single-stage buck-boost conversion and have high reliability; a public document (CN 103219912 B) discloses a A control method suitable for a wide input voltage buck-boost grid-connected inverter. Based on the main circuit topology of the open document (CN 102005962 B), a new control method is proposed, which can work in both buck-boost and buck mode. However, the above public documents have the following problems: four diodes are required, and the cost is high; switching loss and conduction loss are high, and efficiency is low, which is not conducive to popularization and application.
发明内容Contents of the invention
本发明的目的在于针对现有技术中并网逆变器的缺点，提出一种功率器件少和效率高的升降压并网逆变器，并基于该并网逆变器提出一种电流控制方法。The purpose of the present invention is to address the shortcomings of grid-connected inverters in the prior art, to propose a buck-boost grid-connected inverter with fewer power devices and high efficiency, and to propose a current control method based on the grid-connected inverter method.
本发明的升降压并网逆变器，包括输入电源Uin、第一滤波电感L1、第二滤波电感L2、第一开关管S1、第二开关管S2、第五开关管S5、第六开关管S6、第一开关单元1、第二开关单元2、滤波电路3和电网ug，其中第一开关单元1包括第三开关管S3和第一二极管D1，第二开关单元2包括第四开关管S4和第二二极管D2，滤波电路3包括滤波电感Lg、阻尼电阻Rd和滤波电容Cf。具体拓扑结构为：输入电源Uin的正极连接第一开关管S1的一端和第二开关管S2的一端，输入电源Uin的负极分别连接第一滤波电感L1的一端、第二滤波电感L2的一端、第三开关管S3的一端和第四开关管S4的一端，第一开关管S1的另一端连接第五开关管S5的一端和第一滤波电感L1的另一端，第五开关管S5的另一端分别连接第一二极管D1的阴极、滤波电感Lg的一端和阻尼电阻Rd的一端，第一二极管D1的阳极连接第三开关管S3的另一端，阻尼电阻Rd的另一端连接滤波电容Cf的一端，滤波电感Lg的另一端连接电网ug的正极，电网ug的负极分别连接滤波电容Cf的另一端、第六开关管S6的一端和第二二极管D2的阴极，第二二极管D1的阳极连接第四开关管S4的另一端，第六开关管S5的另一端分别连接第二开关管S2的另一端和第二滤波电感L2的另一端。The buck-boost grid-connected inverter of the present invention includes an input power supply U in , a first filter inductor L 1 , a second filter inductor L 2 , a first switch tube S 1 , a second switch tube S 2 , and a fifth switch tube S 5 , the sixth switch tube S 6 , the first switch unit 1, the second switch unit 2, the filter circuit 3 and the grid u g , wherein the first switch unit 1 includes the third switch tube S 3 and the first diode D 1. The second switch unit 2 includes a fourth switch tube S 4 and a second diode D 2 , and the filter circuit 3 includes a filter inductor L g , a damping resistor R d and a filter capacitor C f . The specific topology is as follows: the positive pole of the input power supply U in is connected to one end of the first switching tube S1 and one end of the second switching tube S2, and the negative pole of the input power supply U in is connected to one end of the first filter inductor L1 and the second filter inductor L1 respectively. One end of the inductor L2, one end of the third switching tube S3 and one end of the fourth switching tube S4, the other end of the first switching tube S1 is connected to one end of the fifth switching tube S5 and the first filter inductor L1 The other end, the other end of the fifth switching tube S5 is respectively connected to the cathode of the first diode D1, one end of the filter inductor Lg and one end of the damping resistor Rd , and the anode of the first diode D1 is connected to the third The other end of the switch tube S3 and the other end of the damping resistor R d are connected to one end of the filter capacitor C f , the other end of the filter inductor L g is connected to the positive pole of the power grid u g , and the negative pole of the power grid u g is respectively connected to the other end of the filter capacitor C f One end, one end of the sixth switching tube S6 and the cathode of the second diode D2, the anode of the second diode D1 is connected to the other end of the fourth switching tube S4, and the other end of the sixth switching tube S5 The other end of the second switching tube S2 and the other end of the second filter inductor L2 are respectively connected.
本发明的升降压并网逆变器的控制方法：当电网ug小于等于零时，第二开关管S2、第三开关管S3和第六开关管S6常断，第四开关管S4和第五开关管S5常通，通过调节第一开关管S1的占空比来调节电网电流ig的大小，保证电网电流ig与电网ug同频同相；当电网ug大于零时，第一开关管S1、第四开关管S4和第五开关管S5常断，第三开关管S3和第六开关管S6常通，通过调节第二开关管S2的占空比来调节电网电流ig的大小，保证电网电流ig与电网ug同频同相。The control method of the buck-boost grid-connected inverter of the present invention: when the grid u g is less than or equal to zero, the second switching tube S 2 , the third switching tube S 3 and the sixth switching tube S 6 are normally off, and the fourth switching tube S 4 and the fifth switching tube S 5 are normally on, and the magnitude of the grid current i g is adjusted by adjusting the duty ratio of the first switching tube S 1 to ensure that the grid current i g and the grid u g have the same frequency and phase; when the grid u g When greater than zero, the first switching tube S 1 , the fourth switching tube S 4 and the fifth switching tube S 5 are normally off, and the third switching tube S 3 and the sixth switching tube S 6 are normally on. By adjusting the second switching tube S The duty cycle of 2 is used to adjust the size of the grid current i g to ensure that the grid current i g and the grid u g have the same frequency and phase.
第一开关管S1和第五开关管S5驱动信号共地，第二开关管S2和第六开关管S6驱动信号共地。The driving signals of the first switching tube S1 and the fifth switching tube S5 share a common ground, and the driving signals of the second switching tube S2 and the sixth switching tube S6 share a common ground.
第一～第六开关管为IGBT或MOSFET。第一二极管和第二二极管为碳化硅二极管或快恢复二极管。The first to sixth switch tubes are IGBTs or MOSFETs. The first diode and the second diode are silicon carbide diodes or fast recovery diodes.
输入电源Uin为蓄电池、燃料电池或光伏电池等新型储能电源中的一种。The input power source U in is one of new energy storage power sources such as batteries, fuel cells or photovoltaic cells.
本发明的升降压并网逆变器没有传统桥式逆变器桥臂的功率管直通问题，大大提高了系统的可靠性；各开关管不需要设死区时间，提高了电网电流的波形质量；可实现单级升降压变换，不需要传统降压型并网逆变器的两级变换；只需要2个二极管；导通支路串联的管子少，开关和导通损耗低，效率高。The buck-boost grid-connected inverter of the present invention does not have the power tube straight-through problem of the bridge arm of the traditional bridge inverter, which greatly improves the reliability of the system; each switch tube does not need to set a dead time, which improves the waveform of the grid current Quality; single-stage buck-boost conversion can be realized, no need for two-stage conversion of traditional step-down grid-connected inverter; only 2 diodes are needed; there are few tubes in series in the conduction branch, low switching and conduction losses, and high efficiency high.
附图说明Description of drawings
图1：本发明的升降压并网逆变器的拓扑结构图。Figure 1: Topological structure diagram of the buck-boost grid-connected inverter of the present invention.
图中的主要符号名称：Uin——电源电压，S1～S6——开关管，D1和D2——二极管，L1，L2——滤波电感，Lg——网侧滤波电感，Cf——滤波电容，Rd——阻尼电阻，ug——电网电压，ig——电网电流，iL1，iL2——电感L1和L2的电流。The names of the main symbols in the figure: U in - power supply voltage, S 1 ~ S 6 - switch tubes, D 1 and D 2 - diodes, L 1 , L 2 - filter inductance, L g - grid side filter Inductance, C f - filter capacitor, R d - damping resistance, u g - grid voltage, i g - grid current, i L1 , i L2 - current of inductors L 1 and L 2 .
具体实施方式detailed description
由图1可知，本申请的升降压并网逆变器，包括输入电源Uin、第一滤波电感L1、第二滤波电感L2、第一开关管S1、第二开关管S2、第五开关管S5、第六开关管S6、第一开关单元1、第二开关单元2、滤波电路3和电网ug，其中第一开关单元1包括第三开关管S3和第一二极管D1，第二开关单元2包括第四开关管S4和第二二极管D2，滤波电路3包括滤波电感Lg、阻尼电阻Rd和滤波电容Cf。具体拓扑结构为：输入电源Uin的正极连接第一开关管S1的一端和第二开关管S2的一端，输入电源Uin的负极分别连接第一滤波电感L1的一端、第二滤波电感L2的一端、第三开关管S3的一端和第四开关管S4的一端，第一开关管S1的另一端连接第五开关管S5的一端和第一滤波电感L1的另一端，第五开关管S5的另一端分别连接第一二极管D1的阴极、滤波电感Lg的一端和阻尼电阻Rd的一端，第一二极管D1的阳极连接第三开关管S3的另一端，阻尼电阻Rd的另一端连接滤波电容Cf的一端，滤波电感Lg的另一端连接电网ug的正极，电网ug的负极分别连接滤波电容Cf的另一端、第六开关管S6的一端和第二二极管D2的阴极，第二二极管D1的阳极连接第四开关管S4的另一端，第六开关管S5的另一端分别连接第二开关管S2的另一端和第二滤波电感L2的另一端。It can be seen from Fig. 1 that the buck-boost grid-connected inverter of the present application includes an input power supply U in , a first filter inductor L 1 , a second filter inductor L 2 , a first switch tube S 1 , and a second switch tube S 2 , the fifth switching tube S 5 , the sixth switching tube S 6 , the first switching unit 1, the second switching unit 2, the filter circuit 3 and the grid u g , wherein the first switching unit 1 includes the third switching tube S 3 and the second switching tube S 3 A diode D 1 , the second switch unit 2 includes a fourth switch tube S 4 and a second diode D 2 , and the filter circuit 3 includes a filter inductor L g , a damping resistor R d and a filter capacitor C f . The specific topology is as follows: the positive pole of the input power supply U in is connected to one end of the first switching tube S1 and one end of the second switching tube S2, and the negative pole of the input power supply U in is connected to one end of the first filter inductor L1 and the second filter inductor L1 respectively. One end of the inductor L2, one end of the third switching tube S3 and one end of the fourth switching tube S4, the other end of the first switching tube S1 is connected to one end of the fifth switching tube S5 and the first filter inductor L1 The other end, the other end of the fifth switching tube S5 is respectively connected to the cathode of the first diode D1, one end of the filter inductor Lg and one end of the damping resistor Rd , and the anode of the first diode D1 is connected to the third The other end of the switch tube S3 and the other end of the damping resistor R d are connected to one end of the filter capacitor C f , the other end of the filter inductor L g is connected to the positive pole of the power grid u g , and the negative pole of the power grid u g is respectively connected to the other end of the filter capacitor C f One end, one end of the sixth switching tube S6 and the cathode of the second diode D2, the anode of the second diode D1 is connected to the other end of the fourth switching tube S4, and the other end of the sixth switching tube S5 The other end of the second switching tube S2 and the other end of the second filter inductor L2 are respectively connected.
本申请的升降压并网逆变器的控制方法：当电网ug小于等于零时，第二开关管S2、第三开关管S3和第六开关管S6常断，第四开关管S4和第五开关管S5常通，通过调节第一开关管S1的占空比来调节电网电流ig的大小，保证电网电流ig与电网ug同频同相；当电网ug大于零时，第一开关管S1、第四开关管S4和第五开关管S5常断，第三开关管S3和第六开关管S6常通，通过调节第二开关管S2的占空比来调节电网电流ig的大小，保证电网电流ig与电网ug同频同相。The control method of the buck-boost grid-connected inverter of the present application: when the grid u g is less than or equal to zero, the second switching tube S 2 , the third switching tube S 3 and the sixth switching tube S 6 are normally off, and the fourth switching tube S 4 and the fifth switching tube S 5 are normally on, and the magnitude of the grid current i g is adjusted by adjusting the duty ratio of the first switching tube S 1 to ensure that the grid current i g and the grid u g have the same frequency and phase; when the grid u g When greater than zero, the first switching tube S 1 , the fourth switching tube S 4 and the fifth switching tube S 5 are normally off, and the third switching tube S 3 and the sixth switching tube S 6 are normally on. By adjusting the second switching tube S The duty cycle of 2 is used to adjust the size of the grid current i g to ensure that the grid current i g and the grid u g have the same frequency and phase.
电网电流ig可采用正弦脉冲宽度调制或者滞环电流控制。Grid current i g can be controlled by sinusoidal pulse width modulation or hysteresis current.
在分析之前，作如下假设：①所有开关管和二极管均为理想器件，不考虑开关时间，导通压降；②所有电感、电容均为理想元件。Before the analysis, make the following assumptions: ①All switches and diodes are ideal devices, regardless of switching time and conduction voltage drop; ②All inductors and capacitors are ideal components.
电网电压ug小于等于零时，存在2种工作模态，具体如下：When the grid voltage u g is less than or equal to zero, there are two working modes, as follows:
1)开关模态11) switch mode 1
第一开关管S1、第四开关管S4和第五开关管S5开通，其他开关管都关断，第二开关管S2承受的电压为Uin，第三开关管S3承受的电压为0，第六开关管S6承受的电压为Uin-ug，第一二极管D1承受的电压为Uin，第二二极管D2承受的电压为Uin-ug，第一滤波电感电流iL1负向增加。The first switching tube S 1 , the fourth switching tube S 4 and the fifth switching tube S 5 are turned on, and the other switching tubes are turned off. The second switching tube S 2 bears the voltage U in , and the third switching tube S 3 bears The voltage is 0, the voltage borne by the sixth switch tube S 6 is U in -u g , the voltage borne by the first diode D 1 is U in , and the voltage borne by the second diode D 2 is U in -u g , the first filter inductor current i L1 increases negatively.
2)开关模态22) switch mode 2
第四开关管S4和第五开关管S5开通，其他开关管都关断，第一开关管S1承受的电压为Uin-ug，第二开关管S2承受的电压为Uin，第三开关管S3承受的电压为-ug，第六开关管S6承受的电压为0，第一二极管D1导通，第一滤波电感电流iL1负向减小。The fourth switching tube S 4 and the fifth switching tube S 5 are turned on, and the other switching tubes are turned off, the voltage borne by the first switching tube S 1 is U in -u g , and the voltage borne by the second switching tube S 2 is U in , the voltage borne by the third switching tube S 3 is -ug , the voltage borne by the sixth switching tube S 6 is 0, the first diode D 1 is turned on, and the first filter inductor current i L1 decreases negatively.
电网电压ug大于零时，存在2种工作模态，具体如下：When the grid voltage u g is greater than zero, there are two working modes, as follows:
1)开关模态11) switch mode 1
第二开关管S2、第三开关管S3和第六开关管S6开通，其他开关管都关断，第一开关管S1承受的电压为Uin，第四开关管S4承受的电压为0，第五开关管S5承受的电压为Uin+ug，第二二极管D2承受的电压为Uin，第一二极管D1承受的电压为Uin+ug，第二滤波电感电流iL2上升。The second switching tube S 2 , the third switching tube S 3 , and the sixth switching tube S 6 are turned on, and the other switching tubes are all turned off. The voltage that the first switching tube S 1 bears is U in , and the voltage that the fourth switching tube S 4 bears is The voltage is 0, the voltage borne by the fifth switching tube S 5 is U in +u g , the voltage borne by the second diode D 2 is U in , and the voltage borne by the first diode D 1 is U in +u g , the second filter inductor current i L2 rises.
2)开关模态22) switch mode 2
第三开关管S3和第六开关管S6开通，其他开关管都关断，第二开关管S2承受的电压为Uin+ug，第一开关管S1承受的电压为Uin，第四开关管S4承受的电压为ug，第五开关管S5承受的电压为0，第二二极管D2导通，第二滤波电感电流iL2下降。The third switching tube S 3 and the sixth switching tube S 6 are turned on, and the other switching tubes are turned off, the voltage borne by the second switching tube S 2 is U in + u g , and the voltage borne by the first switching tube S 1 is U in , the voltage borne by the fourth switching tube S 4 is u g , the voltage borne by the fifth switching tube S 5 is 0, the second diode D 2 is turned on, and the second filter inductor current i L2 drops.
Claims (5)
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