CN100358227C - Zero voltage switch three lever double tube positive exciting DC converter with clamp diode - Google Patents
Zero voltage switch three lever double tube positive exciting DC converter with clamp diode Download PDFInfo
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Abstract
一种带箝位二极管的零电压开关三电平双管正激直流变换器，属直流变换器。包括输入分压电容电路(1)、两路双管正激变换器串联电路(2)、高频隔离变压器(5)、整流及滤波电路(6)，还包括一对由耦合电感(Lr1)与(Lr2)组成的耦合电感电路(3)和两个箝位二极管(DC1)与(DC2)组成的二极管箝位电路(4)。该变换器除保留了双管正激变换器的优点之外，不存在反向恢复造成的电压振荡和电压尖峰，减小了整流二极管的损耗，同时由于利用耦合电感中存储的能量实现了开关管的零电压开关，提高了效率和功率密度，可广泛应用于高压输入场合。
The invention relates to a zero-voltage switch three-level double-transistor forward DC converter with clamping diodes, which belongs to the DC converter. Including input voltage dividing capacitor circuit (1), two-way dual-tube forward converter series circuit (2), high-frequency isolation transformer (5), rectification and filter circuit (6), and a pair of coupling inductors (L r1 ) and (L r2 ) a coupled inductance circuit (3) and a diode clamping circuit (4) composed of two clamping diodes (D C1 ) and (D C2 ). In addition to retaining the advantages of the dual-transistor forward converter, the converter does not have voltage oscillation and voltage spikes caused by reverse recovery, which reduces the loss of the rectifier diode. The zero-voltage switch of the tube improves the efficiency and power density, and can be widely used in high-voltage input occasions.
Description
一、技术领域1. Technical field
本发明的带箝位二极管的零电压开关三电平双管正激直流变换器，属电能变换装置的直流变换器。The zero-voltage switch three-level double-tube forward DC converter with clamping diodes of the present invention belongs to the DC converter of an electric energy conversion device.
二、背景技术2. Background technology
近年来，三电平直流变换器在高压输入场合的应用受到了广泛的关注，因为它的开关管电压应力仅为输入电压的一半。三电平直流变换器可以分为两类；一类是1992年巴西Barbi教授提出的三电平直流变换器，用两个开关管串联来代替一个开关管以降低开关管的电压应力，并引入箝位二极管和箝位电压源确保两个开关管电压应力均衡，但是这种三电平直流变换器本质上是一个半桥变换器，存在桥臂直通问题。另一类是1997年美国学者Kutkut提出的三电平双管正激直流变换器，它由两个两路双管正激变换器输入端串联组成，共用一个高频隔离变压器，保留了双管正激变换器无桥臂直通、可靠性高的优点。In recent years, the application of three-level DC converters in high-voltage input applications has received extensive attention, because the voltage stress of its switching tubes is only half of the input voltage. The three-level DC converter can be divided into two categories; one is the three-level DC converter proposed by Professor Barbi of Brazil in 1992, which replaces one switch tube with two switch tubes in series to reduce the voltage stress of the switch tube, and introduces The clamping diode and the clamping voltage source ensure that the voltage stress of the two switching tubes is equalized, but this three-level DC converter is essentially a half-bridge converter, and there is a bridge arm shoot-through problem. The other is the three-level dual-tube forward DC converter proposed by the American scholar Kutkut in 1997. It is composed of two two-way dual-tube forward converters in series, sharing a high-frequency isolation transformer, and retaining the dual-tube forward converter. The forward converter has the advantages of no bridge arm direct connection and high reliability.
在三电平双管正激直流变换器原边加入一对耦合电感可以实现开关管的零电压开关。2004年徐德鸿教授通过在高频隔离变压器副边绕组和整流电路输入端之间接入的电感实现了开关管的零电压开关。这两种方案均只实现了开关管的软开关，而输出整流二极管依然存在反向恢复问题，反向恢复引起电压振荡和电压尖峰，输出整流二极管很容易损坏，降低了变换器的可靠性。Adding a pair of coupled inductors to the primary side of the three-level dual-transistor forward DC converter can realize the zero-voltage switching of the switching tube. In 2004, Professor Xu Dehong realized the zero-voltage switching of the switch tube through the inductance connected between the secondary winding of the high-frequency isolation transformer and the input terminal of the rectifier circuit. These two solutions only realize the soft switching of the switching tube, but the output rectifier diode still has the problem of reverse recovery. The reverse recovery causes voltage oscillation and voltage spikes, and the output rectifier diode is easily damaged, which reduces the reliability of the converter.
三、发明内容3. Contents of the invention
1.本发明的目的在于针对现有技术的不足，提出一种可有效地消除变换器副边整流二极管的电压尖峰和电压振荡，降低副边整流二极管的电压应力，减小整流二极管的损耗，提高变换效率和可靠性的带箝位二极管的零电压开关三电平双管正激直流变换器。1. The purpose of the present invention is to address the deficiencies in the prior art, propose a voltage spike and voltage oscillation that can effectively eliminate the secondary side rectifier diode of the converter, reduce the voltage stress of the secondary side rectifier diode, reduce the loss of the rectifier diode, A zero-voltage switching three-level two-transistor forward DC converter with clamping diodes for improved conversion efficiency and reliability.
2.带箝位二极管的零电压开关三电平双管正激直流变换器，包括一种带箝位二极管的零电压开关三电平双管正激直流变换器，包括输入分压电容电路、由两路双管正激变换器电路串联组成的变换电路、高频隔离变压器、整流滤波器电路，输入分压电容电路的输出连于由两路双管正激变换器电路串联组成的变换电路的两输入端，该变换电路的输出端经高频隔离变压器连于整流滤波电路，所说的变换电路的具体组成是，第一开关管的漏极连于输入分压电容电路的正输出端，第一开关管的源极连于第一续流二极管的阴极，第一续流二极管的阳极连于第三开关管的漏极，第三开关管的源极连于第三续流二极管的阴极，第三续流二极管的阳极连于输入分压电容电路的负输出端；第二开关管的漏极连于第二续流二极管的阳极，第二续流二极管的阴极连于输入分压电容电路的正输出端，第二开关管的源极连于第四续流二极管的阴极，第四续流二极管的阳极连于第四开关管的漏极，第四开关管的源极连于输入分压电容电路的负输出端，其特征在于，还包括在第一开关管和第一变压器原边绕组之间以及在第三开关管和第二变压器原边绕组之间加入一对耦合电感组成的耦合电感电路；在变压器原边绕组和耦合电感交点处分别引出两个箝位二极管组成的二极管箝位电路；其中第一箝位二极管的阴极连于第一变压器原边绕组与第一耦合电感的交点，第一箝位二极管的阳极连于第二开关管的源极，第二箝位二极管的阴极连于第二变压器原边绕组与第二耦合电感的交点，第二箝位二极管的阳极连于第四开关管的源极。2. A zero-voltage switch three-level two-tube forward DC converter with clamping diodes, including a zero-voltage switch three-level two-tube forward DC converter with clamping diodes, including an input voltage dividing capacitor circuit, A conversion circuit composed of two double-tube forward converter circuits connected in series, a high-frequency isolation transformer, and a rectifier filter circuit, and the output of the input voltage dividing capacitor circuit is connected to a conversion circuit composed of two double-tube forward converter circuits connected in series The two input terminals of the conversion circuit are connected to the rectification filter circuit through the high-frequency isolation transformer. The specific composition of the conversion circuit is that the drain of the first switching tube is connected to the positive output terminal of the input voltage dividing capacitor circuit , the source of the first switch is connected to the cathode of the first freewheeling diode, the anode of the first freewheeling diode is connected to the drain of the third switch, and the source of the third switch is connected to the third freewheeling diode The cathode, the anode of the third freewheeling diode is connected to the negative output terminal of the input voltage dividing capacitor circuit; the drain of the second switching tube is connected to the anode of the second freewheeling diode, and the cathode of the second freewheeling diode is connected to the input voltage dividing The positive output end of the capacitor circuit, the source of the second switch tube is connected to the cathode of the fourth freewheeling diode, the anode of the fourth freewheeling diode is connected to the drain of the fourth switch tube, and the source of the fourth switch tube is connected to the The negative output terminal of the input voltage dividing capacitor circuit is characterized in that it also includes adding a pair of coupling inductors between the first switch tube and the primary winding of the first transformer and between the third switch tube and the primary winding of the second transformer A coupled inductor circuit composed of two clamping diodes is drawn at the intersection of the primary winding of the transformer and the coupling inductor; the cathode of the first clamping diode is connected to the primary winding of the first transformer and the first coupling The intersection point of the inductance, the anode of the first clamping diode is connected to the source of the second switch tube, the cathode of the second clamping diode is connected to the intersection of the primary winding of the second transformer and the second coupling inductor, and the second clamping diode The anode is connected to the source of the fourth switch tube.
本发明由于加入了箝位二极管，整流二极管不存在反向恢复造成的电压振荡和电压尖峰，减小了整流二极管的损耗，同时利用耦合电感中存储的能量实现开关管的零电压开关，提高了变换器效率和功率密度。本发明还保留了双管正激变换器无桥臂直通和高可靠性等优点。In the present invention, since the clamping diode is added, the rectifier diode does not have voltage oscillation and voltage spikes caused by reverse recovery, which reduces the loss of the rectifier diode, and at the same time utilizes the energy stored in the coupled inductor to realize the zero-voltage switch of the switch tube, which improves the efficiency of the rectifier diode. Converter efficiency and power density. The invention also retains the advantages of the double-tube forward converter without bridge arm direct connection and high reliability.
四、附图说明4. Description of drawings
附图1是本发明的带箝位二极管的零电压开关三电平双管正激直流变换器电路结构示意图。附图1中的标号名称：1.输入分压电容电路。2.变换电路。3.耦合电感电路。4.二极管箝位电路。5.高频隔离变压器。6.整流滤波电路。
附图2是本发明的带箝位二极管的零电压开关三电平双管正激直流变换器主要波形示意图。Figure 2 is a schematic diagram of the main waveforms of the ZVS three-level dual-transistor forward DC converter with clamping diodes of the present invention.
附图3-10是各开关模态的等效电路结构示意图。Accompanying drawing 3-10 is the equivalent circuit structural diagram of each switching mode.
上述附图中的主要符号名称：Vin——电源电压。Q1～Q4——功率开关管。C1～C4——功率开关管的寄生电容。D1～D4——功率开关管的体二极管。Df1～Df4——续流二极管。DC1～DC2——箝位二极管。Cd1～Cd2——输入分压电容。Tr——高频隔离变压器；变压器原副边变比为K。Lr1、Lr2——耦合电感。NP1、NP2——高频隔离变压器原边绕组；NS1、NS2——高频隔离变压器副边绕组。DR1、DR2——输出整流二极管。CDR1、CDR2——输出整流二极管的结电容。Lf——滤波电感。Cf——滤波电容。RLd——负载。Vo——输出电压。ILf——滤波电感电流。vrect——输出整流电压。iNp1、iNp2——通过高频隔离变压器原边绕组NP1、NP2的电流。iDc1、iDc2——通过两个箝位二极管DC1、DC2的电流。Names of main symbols in the above drawings: Vin ——power supply voltage. Q 1 ~Q 4 ——power switch tube. C 1 ~C 4 ——The parasitic capacitance of the power switch tube. D 1 ~ D 4 ——The body diode of the power switch tube. D f1 ～D f4 —— Freewheeling diodes. D C1 ～D C2 ——Clamping diodes. C d1 ～C d2 —— input voltage dividing capacitor. T r ——high-frequency isolation transformer; the transformation ratio of the primary and secondary sides of the transformer is K. L r1 , L r2 ——coupled inductance. N P1 , N P2 —— Primary winding of high frequency isolation transformer; N S1 , N S2 —— Secondary winding of high frequency isolation transformer. D R1 , D R2 - Output rectifier diodes. C DR1 , C DR2 ——The junction capacitance of the output rectifier diode. L f - filter inductance. C f —— filter capacitance. R Ld - load. V o - output voltage. I Lf - filter inductor current. v rect - output rectified voltage. i Np1 , i Np2 ——the current passing through the primary windings N P1 and N P2 of the high-frequency isolation transformer. i Dc1 , i Dc2 - the currents passing through the two clamping diodes D C1 and D C2 .
五、具体实施方式5. Specific implementation
附图1是带箝位二极管的零电压开关三电平双管正激直流变换器电路结构示意图。包括输入分压电容电路1的输出连于由两路双管正激变换器电路串联组成的变换电路2的两输入端，其输出端经高频隔离变压器5与连于整流滤波电路6。其特征在于，还包括在第一开关管Q1和第一变压器原边绕组NP1之间、第三开关管Q3和第二变压器原边绕组NP2之间加入一对耦合电感Lr1、Lr2组成的耦合电感电路3，且在变压器原边绕组NP1、NP2和耦合电感Lr1、Lr2交点处分别引出两个箝位二极管DC1、DC2组成的二极管箝位电路4，其中第一箝位二极管DC1的阴极连于第一变压器原边绕组NP1与第一耦合电感Lr1的交点，其阳极连于第二开关管Q2的源极，第二箝位二极管DC2的阴极连于第二变压器原边绕组NP2与第二耦合电感Lr2的交点，阳极连于第四开关管Q4的源极。
控制方法如下：两路双管正激变换器180°互补工作。开关管Q2和Q4为180°互补导通，开关管Q1和Q2同时开通，开关管Q1相对于开关管Q2提前一个相位关断；开关管Q3和Q4同时开通，开关管Q3相对于开关管Q4提前一个相位关断。开关管Q1和Q3 PWM工作，通过调节开关管Q1和Q3的脉冲宽度来调节输出电压。控制芯片可以采用两片3525。The control method is as follows: two dual-tube forward converters work in 180° complementarity. The switching tubes Q 2 and Q 4 are 180° complementary conduction, the switching tubes Q 1 and Q 2 are turned on at the same time, the switching tube Q 1 is turned off one phase earlier than the switching tube Q 2 ; the switching tubes Q 3 and Q 4 are turned on at the same time, The switch tube Q3 is turned off one phase earlier than the switch tube Q4 . The switching tubes Q1 and Q3 work in PWM, and the output voltage is adjusted by adjusting the pulse width of the switching tubes Q1 and Q3 . Two 3525 chips can be used as the control chip.
下面以附图1为主电路结构，结合附图2～10叙述本发明的具体工作原理。由附图3可知整个变换器在一个开关周期有16种开关模态，分别是[t0，t1]、[t1，t2]、[t2，t3]、[t3，t4]、[t4，t5]、[t5，t6]、[t6，t7]、[t4，t8]、[t8，t9]、[t9，t10]、[t10，t11]、[t11，t12]、 [t12，t13]、[t13，t14]、 [t14，t15]、[t15，t16](见附图2)，其中，[t0，t8]为前半周期，[t8，t16]为后半周期。下面对各开关模态的工作情况进行具体分析。Below with accompanying drawing 1 main circuit structure, in conjunction with accompanying drawing 2～10 narrate concrete working principle of the present invention. It can be seen from Figure 3 that the entire converter has 16 switching modes in one switching cycle, which are [t 0 , t 1 ], [t 1 , t 2 ], [t 2 , t 3 ], [t 3 , t 4 ], [t 4 , t 5 ], [t 5 , t 6 ], [t 6 , t 7 ], [t 4 , t 8 ], [t 8 , t 9 ], [t 9 , t 10 ] , [t 10 , t 11 ], [t 11 , t 12 ], [t 12 , t 13 ], [t 13 , t 14 ], [t 14 , t 15 ], [t 15 , t 16 ] (see Accompanying drawing 2), wherein, [t 0 , t 8 ] is the first half cycle, [t 8 , t 16 ] is the second half cycle. The working conditions of each switch mode are analyzed in detail below.
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，整流二极管DR1和DR2除外，它等效为一个理想二极管和一个电容并联，以用来模拟反向恢复；②所有电感、电容和变压器均为理想元件；③输入分压电容Cd1和Cd2容量很大且相等，其电压均为输入电压的一半，可看作电压为Vin/2的电压源。1.开关模态1[t0，t1][对应于附图3]Before the analysis, make the following assumptions: ①All switches and diodes are ideal devices, except the rectifier diodes DR1 and DR2 , which are equivalent to an ideal diode and a capacitor connected in parallel to simulate reverse recovery; ②All Inductors, capacitors, and transformers are all ideal components; ③The input voltage dividing capacitors C d1 and C d2 have large and equal capacities, and their voltages are half of the input voltage, which can be regarded as a voltage source with a voltage of V in /2. 1. Switch mode 1 [t 0 , t 1 ] [corresponding to accompanying drawing 3]
t0时刻，开关管Q1和Q2已经开通，通过高频隔离变压器原边绕组NP1的电流iNp1线性增加。由于电流iNp1不足以提供负载电流，副边整流二极管DR1、DR2同时导通续流。At time t 0 , the switching tubes Q1 and Q2 have been turned on, and the current i Np1 passing through the primary winding N P1 of the high-frequency isolation transformer increases linearly. Since the current i Np1 is not enough to provide the load current, the secondary rectifier diodes DR1 and DR2 conduct freewheeling at the same time.
2.开关模态2[t1，t2][对应于附图4]2. Switch mode 2 [t 1 , t 2 ] [corresponding to accompanying drawing 4]
t1时刻原边电流iNp1上升到Io/K，整流二极管DR2截止。耦合电感Lr1、Lr2与整流二极管DR2的结电容CDR2谐振工作，给结电容CDR2充电，电流iNp1继续增加。At time t1 , the primary current i Np1 rises to I o /K, and the rectifier diode DR2 is cut off. The coupled inductors L r1 and L r2 resonate with the junction capacitance C DR2 of the rectifier diode DR2 to charge the junction capacitance C DR2 , and the current i Np1 continues to increase.
3.开关模态3[t2，t3][对应于附图5]3. Switch mode 3 [t 2 , t 3 ] [corresponding to accompanying drawing 5]
t2时刻，结电容CDR2的电压上升到2Vin/K，此时二极管DC2、D14导通，将变压器原边绕组电压箝位在Vin/2，因此整流二极管DR2的电压被箝位在2 Vin/K。该模态中，电流iNp1保持不变。At time t 2 , the voltage of the junction capacitor C DR2 rises to 2V in /K, at this time, the diodes D C2 and D 14 are turned on, and the voltage of the primary winding of the transformer is clamped at V in /2, so the voltage of the rectifier diode DR2 is Clamped at 2 V in /K. In this mode, the current i Np1 remains unchanged.
4.开关模态4[t3，t4][对应于附图6]4. Switch mode 4 [t 3 , t 4 ] [corresponding to accompanying drawing 6]
t3时刻电流iNp2下降到零，二极管DC2、DP1截止，变换器通过原边绕组NP1向负载传递能量，整流二极管DR1流过全部负载电流。At t3 , the current i Np2 drops to zero, the diodes D C2 and D P1 are cut off, the converter transfers energy to the load through the primary winding N P1 , and the rectifier diode D R1 flows through the entire load current.
5.开关模态5[t4，t5][对应于附图7]5. Switch mode 5 [t 4 , t 5 ] [corresponding to accompanying drawing 7]
t4时刻开关管Q1关断，此时变换器谐振工作，参与谐振的是耦合电感Lr1和Lr2、电容C1、C3和电容C4、整流二极管DR2的结电容CDR2。电容C1被充电，电容C3、C4和电容CDR2被放电，由于有电容C1、C3和电容C4，开关管Q1是零电压关断。At time t4 , the switch tube Q1 is turned off, and the converter works in resonance at this time. The coupling inductors L r1 and L r2 , capacitors C 1 , C 3 and capacitor C 4 , and the junction capacitance C DR2 of the rectifier diode DR2 participate in the resonance. Capacitor C 1 is charged, and capacitors C 3 , C 4 and capacitor C DR2 are discharged. Because of capacitors C 1 , C 3 and capacitor C 4 , switching tube Q 1 is turned off with zero voltage.
6.开关模态6[t5，t6][对应于附图8]6. Switch mode 6 [t 5 , t 6 ] [corresponding to accompanying drawing 8]
t5时刻，电容C1被充电到Vin/2，电容C3和电容C4被放电到Vin/4，结电容CDR2被放电到零，此时二极管Df1和整流二极管DR2导通，变压器绕组电压被箝位在零。At time t5 , capacitor C 1 is charged to V in /2, capacitor C 3 and capacitor C 4 are discharged to V in /4, and junction capacitor C DR2 is discharged to zero. At this time, diode D f1 and rectifier diode DR2 conduct On, the transformer winding voltage is clamped at zero.
7.开关模态7[t6，t7][对应于附图9]7. Switch mode 7 [t 6 , t 7 ] [corresponding to accompanying drawing 9]
t6时刻开关管Q2关断，耦合电感Lr1向耦合电感Lr2传输能量，耦合电感Lr1与电容C2谐振工作，开关管Q2两端电压上升；耦合电感Lr2与电容C3、C4谐振工作，开关管Q3、Q4两端电压下降。当开关管Q3、Q4两端电压上升到Vin，电容C2、C3、C4使开关管Q2是零电压关断。。At time t 6 , the switching tube Q 2 is turned off, the coupling inductor L r1 transmits energy to the coupling inductor L r2 , the coupling inductor L r1 and the capacitor C 2 work in resonance, and the voltage at both ends of the switching tube Q 2 rises; the coupling inductor L r2 and the capacitor C 3 , C 4 work in resonance, the voltage at both ends of the switching tubes Q 3 and Q 4 drops. When the voltage across the switching tubes Q 3 and Q 4 rises to V in , the capacitors C 2 , C 3 , and C 4 make the switching tube Q 2 turn off at zero voltage. .
8.开关模态8[t7，t8][对应于附图10]8. Switch mode 8 [t 7 , t 8 ] [corresponding to accompanying drawing 10]
t7时刻，开关管Q2两端电压上升到Vin/2，开关管Q3、Q4两端电压下降到零，二极管Df1、Df2、D1、D2导通，此时可以零电压开通开关管Q3、Q4。t8时刻，电流iNp1、iNp2下降为零。变换器开始另一半周期工作，其工作情况类似于上述的半个周期。At time t 7 , the voltage across the switch tube Q 2 rises to V in /2, the voltage across the switch tube Q 3 and Q 4 drops to zero, and the diodes D f1 , D f2 , D 1 , and D 2 conduct. Zero voltage turns on the switch tubes Q 3 and Q 4 . At time t 8 , the currents i Np1 and i Np2 drop to zero. The converter starts the other half cycle, its operation is similar to the above half cycle.
由以上描述可知，本发明的一种适用于高压输入的零电压开关直流变换器具有如下优点：It can be seen from the above description that a zero-voltage switching DC converter suitable for high-voltage input of the present invention has the following advantages:
①由于加了箝位二极管，副边整流二极管不存在反向恢复造成的电压振荡和电压尖峰，减小了整流二极管上的损耗，可以采用电压定额较低的整流二极管，减小变换器的通态损耗，提高变换效率。① Due to the addition of clamping diodes, there is no voltage oscillation and voltage spikes caused by reverse recovery in the secondary side rectifier diodes, which reduces the loss on the rectifier diodes, and can use rectifier diodes with lower voltage ratings to reduce the converter’s current flow. State loss, improve conversion efficiency.
②开关管电压应力为输入电压的一半，适用于高压输入场合。②The switch tube voltage stress is half of the input voltage, which is suitable for high voltage input occasions.
③利用耦合电感中存储的能量实现开关管的零电压开关，提高了变换器效率和功率密度。③ Utilize the energy stored in the coupled inductor to realize the zero-voltage switching of the switching tube, which improves the efficiency and power density of the converter.
④该变换器保留了双管正激变换器无桥臂直通、可靠性高的优点。④The converter retains the advantages of no bridge arm direct connection and high reliability of the double-tube forward converter.
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| CN100431250C (en) * | 2007-01-15 | 2008-11-05 | 南京航空航天大学 | Isolated DC Converter with Secondary Side Clamp |
| US8279636B2 (en) * | 2008-09-19 | 2012-10-02 | Power Integrations, Inc. | Flyback converter with forward converter reset clamp |
| US8179100B2 (en) * | 2009-03-06 | 2012-05-15 | Illinois Tool Works Inc. | Battery charger using the phase shift by a pair of forward converting circuits |
| CN102231599B (en) * | 2011-06-30 | 2013-10-02 | 南京航空航天大学 | Four-port direct-current converter and control method thereof |
| CN106549563A (en) * | 2017-01-24 | 2017-03-29 | 杭州中恒派威电源有限公司 | A kind of flyback exports high-voltage diode replacement circuit |
| CN107453606B (en) * | 2017-07-26 | 2019-06-25 | 广州金升阳科技有限公司 | A kind of three level Boost circuits |
| CN108667301B (en) * | 2017-10-19 | 2020-11-06 | 湖南工程学院 | Full-bridge converter with follow current path |
| CN108631596A (en) * | 2018-04-24 | 2018-10-09 | 同济大学 | A kind of wide range of power converter of composite resonant |
| CN114915172B (en) * | 2021-02-08 | 2024-12-06 | 苏州明纬科技有限公司 | DC voltage conversion device |
| CN115459243B (en) * | 2022-09-21 | 2024-09-20 | 南京航空航天大学 | Self-balancing photovoltaic converter based on coupled inductor and control method thereof |
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| US5198969A (en) * | 1990-07-13 | 1993-03-30 | Design Automation, Inc. | Soft-switching full-bridge dc/dc converting |
| CN1109399C (en) * | 2000-10-19 | 2003-05-21 | 南京航空航天大学 | Three-level Dc converter of zero-voltage switch with clamping diode |
| JP2004248479A (en) * | 2003-02-17 | 2004-09-02 | Toshiba Corp | 3-level converter |
| CN1545200A (en) * | 2003-11-11 | 2004-11-10 | 南京航空航天大学 | Two-way two-transistor forward converter topology |
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| US5198969A (en) * | 1990-07-13 | 1993-03-30 | Design Automation, Inc. | Soft-switching full-bridge dc/dc converting |
| CN1109399C (en) * | 2000-10-19 | 2003-05-21 | 南京航空航天大学 | Three-level Dc converter of zero-voltage switch with clamping diode |
| JP2004248479A (en) * | 2003-02-17 | 2004-09-02 | Toshiba Corp | 3-level converter |
| CN1545200A (en) * | 2003-11-11 | 2004-11-10 | 南京航空航天大学 | Two-way two-transistor forward converter topology |
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