CN201422082Y - Circuit capable of switching DC voltage to AC voltage - Google Patents

Circuit capable of switching DC voltage to AC voltage Download PDF

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Publication number
CN201422082Y
CN201422082Y CN 200920108583 CN200920108583U CN201422082Y CN 201422082 Y CN201422082 Y CN 201422082Y CN 200920108583 CN200920108583 CN 200920108583 CN 200920108583 U CN200920108583 U CN 200920108583U CN 201422082 Y CN201422082 Y CN 201422082Y
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switching device
connected
end
diode
inductor
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CN 200920108583
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Chinese (zh)
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丁勇强
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北京昆兰新能源技术有限公司
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Abstract

A circuit capable of switching DC voltage to AC voltage comprises an inverter and a DC current supply formed by a solar generator and a capacitor. The inverter comprises six switch devices, six diodesconnected in parallel with the switch devices respectively, a seventh diode, an eighth diode, a first inductor and a second inductor; the first, the third and the fifth switch devices are connected at the two ends of the capacitor in series; the second, the fourth and the sixth switch devices are connected at the two ends of the capacitor in series; the negative pole of the seventh diode is connected to the first end of the third switch device, and the positive pole thereof is connected to the second end of the fourth switch device; the negative pole of the eighth diode is connected to the first end of the fourth switch device, and the positive pole thereof is connected to second end of the third switch device; the first end of the first inductor is connected to the second end of the fourth switch device; the first end of the second inductor is connected to the second end of the third switch device; and the second ends of the first inductor and the second inductor are connected to both ends of an alternating load or to the commercial power, so as to reduce electromagnetic interference.

Description

直流电压转换成交流电压的电路 DC voltage into AC voltage circuit

技术领域 FIELD

本实用新型涉及太阳能发电技术领域,特別涉及一种直流电压转换为交流电压的电路,其实现了直流转换为交流的功能,并避免了输入端子上出现高频电压,同时实现了高效率转换。 The present invention relates to the field of solar power generation technology, particularly to a DC voltage into an AC voltage circuit, which achieves the function of an AC-DC converter, and to avoid the high-frequency voltage appears on the input terminal, while achieving a high conversion efficiency.

背景技术 Background technique

众所周知,交流转换直流稳压电源,已是较为成熟的技术,而由直接电压转换为交流电压的逆变器,起步较晚,早期设计主要使用低频变压器,但体积大而笨重,效率也低。 It is well known AC conversion DC power supply, are relatively mature technology, and from direct voltage into an AC voltage of the inverter, started late, early designed primarily low frequency transformer, but the volume is large and bulky, low in efficiency.

如今已有将光电直流源的直流电压转换为交流电压的方法,但存在效率低、 Now has a direct current source DC voltage of the photoelectric converting AC voltage method, but the presence of low efficiency,

输入端子上容易出现高频电压的问题,专利200510079923. 1是将直流电压源的直流电压转换为交流电压的方法,其实现了直流转换交流的功能,并避免了输入端子上出现的高频电压(EMV问题小),同时实现了高效率的转换。 Prone to problems input high-frequency voltage terminal, Patent 200510079923.1 converting a DC voltage source is a DC voltage into an AC voltage of a method, which realizes the function of DC-AC conversion, and to avoid the high frequency voltage appearing on input terminal (EMV small problem), while achieving high conversion efficiency.

因此,如何设计一种直流转换交流的电路,并且也能克服输入端子上出现的高频电压,达到高效率转换的功能,即为本案发明人所欲解决的方向所在。 Therefore, how to design an AC-DC converter circuit, and also overcome a high frequency voltage appearing on the input terminal, to achieve high efficiency conversion function, that is, the direction to be solved by the present inventor is located.

发明内容 SUMMARY

本实用新型的主要目的是提供一种直流电压转换成交流电压的电路,其避免了输入端子上出现高频电压,同时实现了高效率的转换。 The main object of the present invention is to provide a DC voltage into an AC voltage circuit, which avoids the high-frequency voltage appears on the input terminal, while achieving a high conversion efficiency.

为了达到上述目的,本实用新型提供一种直流电压转换成交流电压的电路, 其包括一直流电流源及一逆变器,所述的直流电流源包括一太阳能发电机及一电容,其特征在于,所述的逆变器包括: To achieve the above object, the present invention provides a DC voltage into an AC voltage circuit, which includes a DC current source and an inverter, said DC current source comprises a solar power generator and a capacitor, wherein said inverter comprises:

六个开关器件,其分别具有一第一端及一第二端,所述第一开关器件的第二端连接于所述第三开关器件的第一端、所述第三开关器件的第二端连接于所述第五开关器件的第一端,所述第一开关器件的第一端与所述笫五开关器件的第二端分別连接于所述电容的两端,所述第二开关器件的第二端连接于所述第四开关器件的第一端,所述第四开关器件的第二端连接于所述第六开关器件的第一端,所述第二开关器件的第一端与所述第六开关器件的第二端分别连接于 Six switching devices, each having a first end and a second end, said first switching device is connected to a first terminal of a second end of the third switching device, the third switching device of the second end of the fifth switching device is connected to a first end, the first end of the first switching device and the second terminal of the fifth switch Zi devices are connected to both ends of the capacitor, the second switch the first device is connected to a second end of the fourth switching device of a first end, a second end of the fourth switching device is connected to the first end of the sixth switching device, the second switching device end of the sixth switching device are connected to a second end

所述电容的两端; The across the capacitor;

六个二极管,其分别反向并联于所述六个开关器件的两端; Six diodes which are antiparallel to the six switching across the device;

一第七二极管,所述第七二极管的负极连接于所述第三开关器件的第一端, 所述第七二极管的正极连接于第四开关器件的第二端; A seventh diode, the anode of said seventh diode is connected to a first end of the third switching device, the cathode of the seventh diode is connected to the second terminal of the fourth switching device;

一第八二极管,所述第八二极管的负极连接于第四开关器件的第一端,所述第八二极管的正极连接于第三开关器件的第二端; An eighth diode, the anode of the eighth diode is connected to the first end of the fourth switching device, the cathode of the eighth diode is connected to the second terminal of the third switching device;

一第一电感,所述第一电感的第一端连接于所述第四开关器件的第二端; A first inductor, a first terminal of the first inductor is connected to a second terminal of the fourth switching device;

and

一第二电感,所述第二电感的第一端连接于所述第三开关器件的第二端, 所述第一电感的第二端及第二电感的第二端连接于交流负载的两端或连接于市电。 A second inductor, a first terminal of the second inductor is connected to a second terminal of the third switching device, the second terminal of the second inductor and the second terminal of the first inductor is connected to two AC load end or connected to the mains.

较佳的,所述第一开关器件、所述第二开关器件、所述第五开关器件及所 Preferably, the first switching device, the second switching device, the switching device and the fifth

述第六开关器件是选用对称的开关管。 Said sixth switching device are chosen symmetric switch. 较佳的,所述的开关管为M0SFET管。 Preferably, the switch is M0SFET tube. 较佳的,第三开关器件及所述第四开关器件为IGBT管。 Preferably, the third and the fourth switching device is a switching device IGBT tube. 较佳的,所述的第三开关器件、第四开关器件以50Hz的输出频率被触发。 Preferably, the third switching device, the fourth switching device is triggered to output a frequency of 50Hz. 较佳的,所述的第一开关器件、第二开关器件、第五开关器件及第六开关 Preferably, said first switching device, second switching device, switching the fifth and sixth switching device

器件以一个KHz范围内的脉冲信号和50Hz的信号触发。 It means the range of the trigger pulse signal KHz and a 50Hz signal. 4交佳的,所述的KHz的脉冲信号为20KHz。 4 cross-kai, said KHz pulse signal is 20KHz.

本实用新型的有益效果在于:本实用新型在高频切换的时候输入的端子台和市电侧没有高频电压,减小了电磁干扰,从而使效率及稳定性更高。 The present invention is advantageous effect in that: the terminal block and the mains-side input of the present invention is not at the time of high frequency switching high-frequency voltage, the electromagnetic interference is reduced, so that higher efficiency and stability.

附图说明 BRIEF DESCRIPTION

图1为本实用新型的一电路布置图; Figure 1 of the present invention a circuit arrangement of FIG;

图2为本实用新型逆变器输出^t矣的市电为正或作为独立的电压源输出为正、 高频触发信号为1时的电流回路; FIG 2 ^ t new inverter output carry mains a positive or as a separate source output voltage is positive, the high-frequency current circuit when the trigger signal is present in a practical;

图3为本实用新型逆变器输出接的市电为正或作为独立的电压源输出为正、 高频触发信号为0时的电流回路; 3 of the present invention FIG inverter output is connected to mains or as a separate positive output is positive voltage source, a high-frequency current loop when the trigger signal is 0;

图4为本实用新型逆变器输出接的市电为负或作为立的电压源输出为负、高频触发信号为1时的电流回路; 4 of the present invention FIG inverter output is connected to the mains voltage source negative or standing as a negative output, a high-frequency current circuit when the trigger signal is 1;

图5为本实用新型逆变器输出接的市电为负或作为独立的电压源输出为负、 高频触发信号为0时的电流回路。 5 of the present invention FIG inverter output is connected to the mains or as an independent negative voltage source output is negative, the trigger signal is a high frequency current loop zero.

附图标记说明:l-直流电流源;2-逆变器;SG-太阳能发电机;SI-第一开关器件;S2-第二开关器件;S3-第三开关器件;Sl第四开关器件;S5-第五开关器件;S6-第六开关器件;Dl-第一二极管;D2-第二二极管;D3-第三二极管; D4-第四二极管;D5-第五二极管;D6-第六二极管;D7-第七二极管;D8-第八二极管;Ll-第一二电感;L2-第二电感。 DESCRIPTION OF REFERENCE NUMERALS: l- DC current source; 2- inverter; SG- solar generator; SI-first switching device; S2- second switching device; S3- third switching device; Sl is fourth switching device; S5- fifth switching device; S6-sixth switching device; DL- a first diode; a second diode D2-; D3-third diode; a fourth diode D4-; D5-V diode; D6-sixth diode; seventh diode D7 ~; D8-eighth diode; ll- first two inductor; the L2-second inductor.

具体实施方式 Detailed ways

以下结合附图,对本实用新型上述的和另外的技术特征和优点作更详细的说明。 Below in conjunction with the accompanying drawings, the present invention described above and additional features and advantages in more detail.

如图1所述,所述的直流电压转换成交流电压的电路包括一直流电流源1 及一逆变器2,所述的直流电流源包括一太阳能发电机SG及一电容Cl; As shown in Figure 1, the DC voltage into an AC voltage circuit comprises a dc current source 1 and an inverter 2, the DC current source comprises a solar generator SG and a capacitor Cl;

所述的逆变器2包括:六个开关器件SI-S6及六个二极管Dl-D6;其中,所述的六个二极管D1-D6,分别反向并联于所述的开关器件SI-S6的两端,即第一二极管Dl反向并联于第一开关器件Sl的两端、第二二极管D2反向并联于第二开关器件S2的两端、第三二极管D3反向并联于第三开关器件S3的两端、第四二极管D4反向并联于第四开关器件S4的两端、第五二极管D5反向并联于第五开关器件S5的两端、第六二极管D6反向并联于第六开关器件S6的两端; The inverter 2 includes: six switching devices SI-S6 and six diodes Dl-D6; wherein said six diodes D1-D6, respectively, antiparallel to the switching devices of the SI-S6 ends, i.e. the first diode Dl antiparallel to the switching devices Sl ends of the first and second antiparallel diode D2 at both ends of the second switching device S2, the third diode D3 reverse connected in parallel to both ends of the third switching device S3, and the fourth diode D4 connected in parallel to both ends of the reverse switching device S4 of the fourth, fifth diode D5 connected in parallel to both ends of the counter fifth switching device S5, the first six antiparallel diode D6 at both ends of the sixth switching device S6;

所述六个开关器件Sl-S6分別具有一第一端及一第二端,所述第一开关器件S1的第二端连接于第三开关器件S3的第一端、第三开关器件S3的第二端连接于第五开关器件S5的第一端,第一开关器件Sl的第一端与第五开关器件S5 的第二端分别连接于电容Cl的两端;所述第二开关器件S2的第二端连接于第四开关器件S4的第一端,所述第四开关器件S4的笫二端连接于第六开关器件S6 的第一端,所述第二开关器件S2的第一端与所述第六开关器件S6的第二端分别连接于电容C1的两端; The six switching devices Sl-S6 each having a first end and a second end, the second end of the first switching device S1 is connected to a first terminal of the third switching device S3, the third switching device S3 a second end connected to a first end of the fifth switching device S5, the first terminal of the first switching devices Sl and the second end of the fifth switching device S5 connected across the capacitor Cl, respectively; the second switching device S2 a second terminal connected to a first terminal of the fourth switching device S4, the undertaking of the two ends of the fourth switching device S4 is connected to a first end of the sixth switching device S6, the first terminal of the second switching device S2 are respectively connected to both ends of the capacitor C1 and the second end of the sixth switch S6 of the device;

所迷的逆变器2还包括一第一电感Ll及一第二电感L2,所述第一电感Ll 的第一端连接于第四开关器件S4的第二端,所述第二电感L2的第一端连接于第三开关器件S3的第二端,所述第一电感Ll的第二端与第二电感L2的第二端连接于交流负载的两端或连接于市电;所述的逆变器2还包括一第七二极管D7及一第八二极管D8,所述第七二极管D7的负极连接于所述第三开关器件S3的第一端,所述第七二极管D7的正极连接于第四开关器件S4的第二端,所述第八二极管D8的负极连接于第四开关器件S4的第一端,所述第八二极管D8的正极连接于第三开关器件S3的第二端。 The fan inverter 2 further comprising a first inductor Ll and a second inductor L2, the first inductor Ll is connected to a first end of the second end of the fourth switching device S4, the second inductor L2 a first end connected to the second terminal of the third switching device S3, the first inductor Ll and the second end of the second end of the second inductor L2 connected across the AC load or connection to the mains; the the inverter 2 also comprises a seventh diode D7 and an eighth diode D8, the cathode of the seventh diode D7 is connected to the first terminal of the third switching device S3, the seventh anode of the diode D7 is connected to a second terminal of the fourth switching device S4, the cathode of the eighth diode D8 is connected to a first terminal of the fourth switching device S4, the anode of the eighth diode D8 connected to the second terminal of the third switching device S3.

当所述逆变器2以50Hz的市电输出频率来切换所述的第三开关器件S3及第四开关器件S4,而第一开关器件S1、第二开关器件S2、第五开关器件S5及第六开关器件S6则在一个KHz范围内例如20KHz的高频调制脉冲信号和50Hz 的信号触发。 2 when the inverter output frequency of 50Hz to the mains by switching said third switching element S3 and a fourth switching device S4, and the first switching device S1, the second switching device S2, and the fifth switching device S5 the sixth switching device S6 e.g. 20KHz pulse frequency modulated signal and the trigger signal of 50Hz in a KHz range.

当所述逆变器2输出接的市电为正或作为独立的电压源输出为正时,第四开关器件S4开通,第一开关器件Sl、第三开关器件S3、第六开关器件S6关断, 第二开关器件S2、第五开关器件S5被以KHz范围内如20KHz的高频信号触发。 2, when the output of the inverter is connected to mains or as a separate positive voltage source output is positive, the fourth switching device S4 turn, Sl is the first switching device, the third switching device S3, S6 sixth switching device OFF off, the second switching device S2, S5 is a fifth switching device to trigger the high-frequency signal within KHz to 20KHz range. 当高频触发信号为l时,第二开关器件S2、第五开关器件S5导通,电流回路如图2所示,如果输出接的市电,则输入直流源的中点电位和市电中点电位是同电位的。 When the trigger signal is frequency L, a second switching device S2, the fifth switching device S5 is turned on, the current circuit shown in Figure 2, if the output connected to the mains, the mains input midpoint potential and the direct current source point potential is the same potential. 当高频触发信号为O时,第二开关器件S2、第五开关器件S5截止,电流回路如图3所示,如果输出接的为市电,则市电的中点电位是由而第一开关器件Sl、第二开关器件S2、第五开关器件S5及第六开关器件S6的分压决定的, 因为第一开关器件S1、第二开关器件S2、第五开关器件S5及第六开关器件S6 是选用对称的开关管,所以市电的中点电位和输入直流源的中点电位相同,所述逆变器2在高频切换的时候输入的端子台和市电侧(如果逆变器输出接的是市电)没有高频电压,减小了电磁干扰。 When the trigger signal frequency is O, a second switching device S2, S5 fifth switching device is turned off, the current circuit shown in Figure 3, if the output is connected to the mains, the mains neutral point potential by the first Sl is a switching device, a second switching device S2, the fifth switching device S5 and the sixth switching device S6, the partial pressure determination, since the first switching device S1, the second switching device S2, the fifth switching device S5 and the sixth switching devices S6 is a switch selection symmetrical, the same midpoint potential midpoint potential direct current source and the input of the mains, and a mains-side terminal block (if the inverter 2 when the inverter input frequency switching mains output contact) is not high-frequency voltage, the electromagnetic interference is reduced.

当所述逆变器2输出接的市电为负或作为独立的电压源输出为负时,第三开关器件S3开通,第二开关器件S2、第四开关器件S4、第五开关器件S5关断, 第一开关器件Sl、第六开关器件S6被以Mz范围内如20KHz的高频信号触发。 2, when the output of the inverter connected to mains or as a separate negative voltage source output is negative, the third switching device S3 turn, the second switching device S2, the fourth switching device S4, a fifth switching device S5 OFF off, the first switching device Sl is, in a sixth switching device S6 is within the scope of Mz 20KHz high frequency signal as a trigger. 当高频触发信号为l时,第一开关器件S1、第六开关器件S6导通,电流回路如图4所示,如果输出接的市电,则输入直流源的中点电位和市电中点电位是同电位的。 When the trigger signal is frequency L, a first switching means Sl, the sixth switching device S6 is turned on, the current circuit shown in Figure 4, if the output of the mains connection, and the input midpoint potential of the mains current source point potential is the same potential. 当高频触发信号为O时,第一开关器件S1、第六开关器件S6截止,电流回路如图5所示,如果输出接的为市电,则市电的中点电位是由而第一开关器件Sl、第二开关器件S2、第五开关器件S5及第六开关器件S6的分压决定的, 因为第一开关器件S1、第二开关器件S2、第五开关器件S5及第六开关器件S6 是选用对称的开关管,所以市电的中点电位和输入直流源的中点电位相同,从而逆变器在高频切换的时候输入的端子台和市电侧(如果逆变器输出接的是市电)没有高频电压,减小了电磁干扰。 When the trigger signal frequency is O, Sl first switching device, the sixth switching device S6 is turned off, the current circuit shown in Figure 5, if the output is connected to the mains, the mains neutral point potential by the first Sl is a switching device, a second switching device S2, the fifth switching device S5 and the sixth switching device S6, the partial pressure determination, since the first switching device S1, the second switching device S2, the fifth switching device S5 and the sixth switching devices S6 is a switch selection symmetrical, the same midpoint potential direct current source and the input midpoint potential of commercial power, and the electric terminal block side when the inverter frequency so that the switching input of the city (if connected to the inverter output the mains) no high-frequency voltage, the electromagnetic interference is reduced.

其中,为了提供逆变器2的效率,第一开关器件S1、第二开关器件S2、第五开关器件S5及第六开关器件S6可选择同一型号的M0SFET管作为开关器件, 第三开关器件S3及第四开关器件S4则选择IGBT作为开关器件。 Wherein, in order to provide the efficiency of the inverter 2, S6 select the same type of first switching device S1, the second switching device S2, the fifth switch S5 and the sixth switching devices M0SFET tube device as a switching device, a third switching device S3 and a fourth switching device S4 is selected as the switching device IGBT.

以上说明对本实用新型而言只是说明性的,而非限制性的,本领域普通技术人员理解,在不脱离以下所附权利要求所限定的精神和范围的情况下,可做出许多修改,变化,或等效,但都将落入本实用新型的保护范围内。 The foregoing description of the present invention is merely illustrative purposes, and not restrictive, those of ordinary skill in the art understand, without departing from the following claims as defined by the appended spirit and scope, many modifications, variations , or equivalent, but it will fall within the scope of protection of the present invention.

Claims (7)

1.一种直流电压转换成交流电压的电路,其包括一直流电流源及一逆变器,所述的直流电流源包括一太阳能发电机及一电容,其特征在于,所述的逆变器包括: 六个开关器件,其分别具有一第一端及一第二端,所述第一开关器件的第二端连接于所述第三开关器件的第一端、所述第三开关器件的第二端连接于所述第五开关器件的第一端,所述第一开关器件的第一端与所述第五开关器件的第二端分别连接于所述电容的两端,所述第二开关器件的第二端连接于所述第四开关器件的第一端,所述第四开关器件的第二端连接于所述第六开关器件的第一端,所述第二开关器件的第一端与所述第六开关器件的第二端分别连接于所述电容的两端; 六个二极管,其分别反向并联于所述六个开关器件的两端; 一第七二极管,所述第七二极管的负极连接于所述第三开关 1. A DC voltage into an AC voltage circuit, which includes a DC current source and an inverter, said DC current source comprises a solar power generator and a capacitor, wherein the inverter comprising: six switching devices, each having a first end and a second end, a second end of the first switching device is connected to the first terminal of the third switching device, the third switching device a second end connected to the first end of the fifth switching device, a first end of said first switching device and the second end of the fifth switching device are connected to both ends of the capacitor, the second a second terminal connected to said second switching device of a first end of the fourth switching device, a second terminal of the fourth switching device is connected to a first terminal of the sixth switching device, the second switching device a first end and a second end of the sixth switching device are connected to both ends of the capacitor; six diodes which are connected in parallel to both ends of the six reverse switching device; and a seventh diode the negative electrode of said seventh diode is connected to a third switch 件的第一端,所述第七二极管的正极连接于所述第四开关器件的第二端; 一第八二极管,所述第八二极管的负极连接于第四开关器件的第一端,所述第八二极管的正极连接于所述第三开关器件的第二端; 一第一电感,所述第一电感的第一端连接于所述第四开关器件的第二端;及一第二电感,所述第二电感的第一端连接于所述第三开关器件的第二端,所述第一电感的第二端及第二电感的第二端连接于交流负载的两端或连接于市电。 A first end member, said seventh diode is connected to the positive electrode of the fourth switching device to a second end; an eighth diode, the anode of said eighth diode is connected to the fourth switching device a first end of said eighth diode anode connected to the second terminal of the third switching device; a first inductor, a first terminal of the first inductor is connected to the fourth switching device a second end; and a second inductor, a first terminal of the second inductor is connected to a second terminal of the third switching device, and the second end of the second end of the second inductor is connected to a first inductor AC load or both ends of the connection to the mains.
2. 根据权利要求1所述的直流电压转换成交流电压的电路,其特征在于, 所述第一开关器件、所述第二开关器件、所述第五开关器件及所述第六开关器件是选用对称的开关管。 The DC voltage converter according to claim 1 into an AC voltage circuit, characterized in that said first switching device, the second switching device, the switching device and the fifth switching device is a sixth symmetry of the switch.
3. 根据权利要求2所述的直流电压转换成交流电压的电路,其特征在于, 所述的开关管为M0SFET管。 3. The direct-current voltage according to claim 2 is converted into an AC voltage circuit, wherein said switch is M0SFET tube.
4. 根据权利要求1所述的直流电压转换成交流电压的电路,其特征在于, 第三开关器件及所述第四开关器件为IGBT管。 The DC voltage converter according to claim 1 into an AC voltage circuit, characterized in that the third switching device and the fourth switching device is an IGBT tube.
5. 根据权利要求1所述的直流电压转换成交流电压的电路,其特征在于, 所述的第三开关器件、第四开关器件以50Hz的输出频率被触发。 The DC voltage according to claim 1 is converted into an AC voltage circuit, characterized in that said third switching device, the fourth switching device is triggered to output a frequency of 50Hz.
6. 根据权利要求1所述的直流电压转换成交流电压的电路,其特征在于,所述的第一开关器件、第二开关器件、第五开关器件及第六开关器件以一个KHz 范围内的脉冲信号和50Hz的信号触发。 The DC voltage converter according to claim 1 into an AC voltage circuit, characterized in that said first switching device, second switching device, the switching device and the fifth to sixth switching device within a range of KHz pulse trigger signal and the signal of 50Hz.
7. 根据权利要求6所迷的直流电压转换成交流电压的电路,其特征在于, 所述的KHz的脉冲信号为20KHz。 7.6 fans DC voltage converter according to claim circuits AC voltage, wherein said pulse signal KHz to 20KHz.
CN 200920108583 2009-06-04 2009-06-04 Circuit capable of switching DC voltage to AC voltage CN201422082Y (en)

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CN101908831B (en) 2009-06-04 2012-05-23 北京昆兰新能源技术有限公司 Circuit for converting direct-current voltage into alternating-current voltage
WO2010139187A1 (en) * 2009-06-04 2010-12-09 北京昆兰新能源技术有限公司 Circuit for converting dc voltage to ac voltage
CN102237815A (en) * 2011-03-29 2011-11-09 杭州浙大桑尼能源科技有限公司 High-efficiency and reliable direct-current to alternating-current conversion circuit
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CN103051169A (en) * 2012-12-24 2013-04-17 江苏兆伏新能源有限公司 Reactive power control method of inverter topology circuit
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