技术领域Technical field
本发明涉及一种高增益隔离H桥式软开关DC-DC变换器，属于DC-DC变换设备技术领域。The invention relates to a high-gain isolated H-bridge soft-switching DC-DC converter, belonging to the technical field of DC-DC conversion equipment.
背景技术Background technique
当下全球电力生产结构慢慢向可再生能源发电转型，例如太阳能发电，太阳能光伏发电板的输出电压较低，不能直接供电网使用，在能源转换时往往会面临输出电压不稳、升压比和效率较低的问题，为了解决上述问题，需要高增益、输出电压稳定的DC-DC变换器。At present, the global power production structure is slowly transforming to renewable energy power generation, such as solar power generation. The output voltage of solar photovoltaic power generation panels is low and cannot be directly used in the power supply network. During energy conversion, it often faces unstable output voltage, boost ratio and In order to solve the problem of low efficiency, a DC-DC converter with high gain and stable output voltage is needed.
文献“MIAO, SHAN, LIU, WEI, GAO, JINFENG. Single-Inductor BoostConverter With Ultrahigh Step-Up Gain, Lower Switches Voltage Stress,Continuous Input Current, and Common Grounded Structure[J]. IEEE Transactionson Power Electronics,2021,36(7):7841-7852. DOI:10.1109/TPEL.2020.3047660.”在H结构的开关上增加多个倍压整流模块，获得了较高的升压，但是电路没有实现软开关，在高频时，开关管和二极管上会产生开关损耗，造成功率的损耗。文献“KONSTANTINOSZAOSKOUFIS, EMMANUEL C. TATAKIS. Isolated ZVS-ZCS DC–DC High Step-UpConverter With Low-Ripple Input Current[J]. 2021,2(4):464-480. DOI:10.1109/JESTIE.2021.3063913.”通过有源钳位电路和变压器一次侧漏感，实现了开关管的软开关，同时在变压器二次侧由于漏感的存在减小了二级管的开关损耗，从而提高了效率。但是有源钳位中的电容仅用来钳位，成本增加。文献“LEE, SIN-WOO, DO, HYUN-LARK. HighStep-Up Coupled-Inductor Cascade Boost DC-DC Converter With Lossless PassiveSnubber[J]. IEEE Transactions on Industrial Electronics,2018,65(10):7753-7761. DOI:10.1109/TIE.2018.2803731.” 采用无损无源缓冲电路，使变换器具有较高的电压增益和更高的功率效率，但是采用的电子器件较多，变换器功率密度低，成本较高。文献“He L Z, Zheng Z P, and Guo D. High step-up DC–DC converter with activesoft-switching and voltage-clamping for renewable energy systems[J]. IEEETransactions on Power Electronics, 2018, 33(11): 9496-9505.”虽然通过耦合电感和有源钳位实现了开关管的软开关，但是由于其将输入电感替换为了耦合电感，导致了输入电流不连续，限制了变换器的使用场合。Document "MIAO, SHAN, LIU, WEI, GAO, JINFENG. Single-Inductor BoostConverter With Ultrahigh Step-Up Gain, Lower Switches Voltage Stress, Continuous Input Current, and Common Grounded Structure[J]. IEEE Transactionson Power Electronics, 2021,36 (7):7841-7852. DOI:10.1109/TPEL.2020.3047660." Adding multiple voltage doubler rectifier modules to the H-structure switch can achieve a higher voltage boost, but the circuit does not implement soft switching. At high frequencies, , switching losses will occur on the switch tube and diode, causing power loss. Document "KONSTANTINOSZAOSKOUFIS, EMMANUEL C. TATAKIS. Isolated ZVS-ZCS DC–DC High Step-UpConverter With Low-Ripple Input Current[J]. 2021,2(4):464-480. DOI:10.1109/JESTIE.2021.3063913." Through the active clamp circuit and the leakage inductance on the primary side of the transformer, soft switching of the switching tube is achieved. At the same time, the presence of leakage inductance on the secondary side of the transformer reduces the switching loss of the diode, thereby improving efficiency. However, the capacitor in the active clamp is only used for clamping, which increases the cost. Document "LEE, SIN-WOO, DO, HYUN-LARK. HighStep-Up Coupled-Inductor Cascade Boost DC-DC Converter With Lossless PassiveSnubber[J]. IEEE Transactions on Industrial Electronics, 2018, 65(10):7753-7761. DOI:10.1109/TIE.2018.2803731.” Lossless passive buffer circuit is used to make the converter have higher voltage gain and higher power efficiency. However, more electronic devices are used, and the power density of the converter is low and the cost is high. Document "He L Z, Zheng Z P, and Guo D. High step-up DC–DC converter with activesoft-switching and voltage-clamping for renewable energy systems[J]. IEEETransactions on Power Electronics, 2018, 33(11): 9496- 9505." Although soft switching of the switch tube is achieved through coupled inductors and active clamps, it replaces the input inductor with a coupled inductor, resulting in discontinuous input current, which limits the use of the converter.
发明内容Contents of the invention
本发明的目的在于克服现有技术中的不足，提供一种高增益隔离H桥式软开关DC-DC变换器，解决现有的DC-DC变换器存在开关功耗高、成本高以及输入电流不连续的技术问题。The purpose of the present invention is to overcome the deficiencies in the prior art and provide a high-gain isolated H-bridge soft-switching DC-DC converter to solve the problems of high switching power consumption, high cost and input current in the existing DC-DC converter. Discontinuous technical issues.
为达到上述目的，本发明是采用下述技术方案实现的：In order to achieve the above objects, the present invention is achieved by adopting the following technical solutions:
本发明提供了一种高增益隔离H桥式软开关DC-DC变换器，包括直流输入电压源、储能电感、钳位单元、第二储能电容、双耦合绕组以及整流输出单元；所述钳位单元包括第一开关管、第二开关管、第三开关管、第四开关管以及第一储能电容，所述第一储能电容一端连接至第一开关管和第四开关管的源极，另一端连接至第二开关管和第三开关管的漏极；所述双耦合绕组包括相互耦合的第一耦合电感和第二耦合电感；The invention provides a high-gain isolated H-bridge soft-switching DC-DC converter, which includes a DC input voltage source, an energy storage inductor, a clamping unit, a second energy storage capacitor, a double coupling winding and a rectification output unit; The clamping unit includes a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a first energy storage capacitor. One end of the first energy storage capacitor is connected to the first switch tube and the fourth switch tube. The source electrode, the other end is connected to the drain electrode of the second switching tube and the third switching tube; the double coupling winding includes a first coupling inductor and a second coupling inductor that are coupled to each other;
所述储能电感一端连接至直流输入电压源的正极，另一端连接至第一开关管的漏极、第三开关管的源极以及第二储能电容的正极，所述第二储能电容的负极连接至第一耦合电感的异名端，所述第一耦合电感的同名端连接至直流输入电压源的负极、第二开关管的源极以及第四开关管的漏极；One end of the energy storage inductor is connected to the positive electrode of the DC input voltage source, and the other end is connected to the drain of the first switch tube, the source of the third switch tube, and the positive electrode of the second energy storage capacitor. The second energy storage capacitor The negative electrode is connected to the opposite end of the first coupling inductor, and the same end of the first coupling inductor is connected to the negative electrode of the DC input voltage source, the source of the second switching tube, and the drain of the fourth switching tube;
所述整流输出单元包括第一二极管、第二二极管、第三储能电容以及第四储能电容，所述第一二极管的负极和第三储能电容的正极连接至负载的一端，所述第二二极管的正极和第四储能电容的负极连接至负载的另一端，所述第一二极管的正极和第二二极管的负极连接至第二耦合电感的异名端，所述第三储能电容的负极和第四储能电容的正极连接至第二耦合电感的同名端。The rectified output unit includes a first diode, a second diode, a third energy storage capacitor and a fourth energy storage capacitor. The cathode of the first diode and the anode of the third energy storage capacitor are connected to the load. One end of the load, the anode of the second diode and the cathode of the fourth energy storage capacitor are connected to the other end of the load, the anode of the first diode and the cathode of the second diode are connected to the second coupling inductor The negative terminal of the third energy storage capacitor and the positive terminal of the fourth energy storage capacitor are connected to the same terminal of the second coupling inductor.
可选的，所述第一开关管上还包括其第一体二极管和第一缓冲电容，所述第一体二极管的阳极和负极分别连接至所述第一开关管的源极和漏极，所述第一缓冲电容的负极和阳极分别连接至所述第一开关管的源极和漏极；Optionally, the first switching tube further includes a first body diode and a first buffer capacitor, and the anode and cathode of the first body diode are respectively connected to the source and drain of the first switching tube. The cathode and anode of the first buffer capacitor are respectively connected to the source and drain of the first switch;
所述第二开关管上还包括其第二体二极管和第二缓冲电容，所述第二体二极管的阳极和负极分别连接至所述第二开关管的源极和漏极，所述第二缓冲电容的负极和阳极分别连接至所述第二开关管的源极和漏极；The second switch tube also includes a second body diode and a second buffer capacitor. The anode and cathode of the second body diode are respectively connected to the source and drain of the second switch tube. The second The cathode and the anode of the buffer capacitor are respectively connected to the source and drain of the second switch tube;
所述第三开关管上还包括其第三体二极管和第三缓冲电容，所述第三体二极管的阳极和负极分别连接至所述第三开关管的源极和漏极，所述第三缓冲电容的负极和阳极分别连接至所述第三开关管的源极和漏极；The third switching tube also includes a third body diode and a third buffer capacitor. The anode and cathode of the third body diode are respectively connected to the source and drain of the third switching tube. The cathode and the anode of the buffer capacitor are respectively connected to the source and drain of the third switch tube;
所述第四开关管上还包括其第四体二极管和第四缓冲电容，所述第四体二极管的阳极和负极分别连接至所述第四开关管的源极和漏极，所述第四缓冲电容的负极和阳极分别连接至所述第四开关管的源极和漏极。The fourth switching tube also includes a fourth body diode and a fourth buffer capacitor. The anode and cathode of the fourth body diode are respectively connected to the source and drain of the fourth switching tube. The fourth The cathode and the anode of the buffer capacitor are respectively connected to the source and drain of the fourth switch tube.
可选的，所述第一开关管、第二开关管、第三开关管以及第四开关管均采用N沟道的MOS管。Optionally, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are all N-channel MOS tubes.
可选的，所述第一开关管、第二开关管、第三开关管以及第四开关管接收外部控制器的控制信号，所述控制信号为单极性PWM控制信号。Optionally, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube receive a control signal from an external controller, and the control signal is a unipolar PWM control signal.
可选的，所述第一开关管和第二开关管为主开关管同时导通，所述第三开关管和第四开关管为辅助开关管同时导通，所述主开关管和辅助开关管互补导通。Optionally, the first switch tube and the second switch tube are turned on at the same time as the main switch tube, and the third switch tube and the fourth switch tube are turned on at the same time as the auxiliary switch tube. The main switch tube and the auxiliary switch tube are turned on at the same time. The tubes are complementary to each other.
可选的，所述双耦合绕组等效为匝比的理想变压器、一次侧励磁电感、一次侧漏感和二次侧漏感。Optionally, the double coupled winding is equivalent to the turns ratio The ideal transformer, primary side magnetizing inductance, primary side leakage inductance and secondary side leakage inductance.
与现有技术相比，本发明所达到的有益效果：Compared with the prior art, the beneficial effects achieved by the present invention are:
本发明提供的一种高增益隔离H桥式软开关DC-DC变换器，该电路可以满足在低于0.5占空比的条件下实现较高的电压增益，所有的开关管和二极管都有电容进行钳位，减小了开关管和二级管的电压应力，从而降低了对开关管和二级管的电压要求并提高的可靠性；本发明通过有源钳位软开关的方式，使一次侧漏感与开关管缓冲电容在PWM死区时进行谐振，控制方便；同时抑制了耦合电感漏感产生的电压尖峰，优化了变换器的电磁干扰；功率开关管实现了ZVS零电压启动，二级管实现了ZVC零电流启动，减少了开关损耗，提升了变换器效率；本发明通过双耦合绕组实现了输入端和输出端的电气隔离，提高了用电的安全性；本发明结构对称性高，控制方便，设计成本低，具有较高的安全性和可靠性；本发明非常适合应用于电压波动较大的可再生能源发电系统中，实现电路隔离和升压功能，满足分布式发电系统并网所需直流电压和隔离要求。The invention provides a high-gain isolated H-bridge soft-switching DC-DC converter. This circuit can achieve high voltage gain under the condition of a duty cycle lower than 0.5. All switching tubes and diodes have capacitances. Clamping reduces the voltage stress of the switching tube and the diode, thereby reducing the voltage requirements for the switching tube and the diode and improving the reliability; the present invention uses active clamping soft switching to make a The side leakage inductance and the switch tube buffer capacitor resonate in the PWM dead zone, which is easy to control; at the same time, the voltage spike generated by the coupling inductor leakage inductance is suppressed, optimizing the electromagnetic interference of the converter; the power switch tube realizes ZVS zero-voltage start-up. The stage tube realizes ZVC zero-current start-up, reduces switching loss, and improves converter efficiency; the present invention realizes electrical isolation between the input end and the output end through double coupling windings, improving the safety of electricity; the present invention has high structural symmetry , easy to control, low in design cost, and with high safety and reliability; the invention is very suitable for application in renewable energy power generation systems with large voltage fluctuations, realizing circuit isolation and voltage boosting functions to meet the requirements of distributed power generation systems and DC voltage and isolation requirements required by the network.
附图说明Description of drawings
图1是本发明实施例提供的高增益隔离H桥式软开关DC-DC变换器的电路原理图；Figure 1 is a circuit schematic diagram of a high-gain isolated H-bridge soft-switching DC-DC converter provided by an embodiment of the present invention;
图2是本发明实施例提供的钳位单元中开关管控制信号的波形图；Figure 2 is a waveform diagram of the switch control signal in the clamping unit provided by the embodiment of the present invention;
图3是本发明实施例提供的主开关管导通的工作状态示意图；Figure 3 is a schematic diagram of the main switch conduction working state provided by the embodiment of the present invention;
图4是本发明实施例提供的主开关管关断的工作状态示意图；Figure 4 is a schematic diagram of the working state of the main switch turned off according to the embodiment of the present invention;
图5是本发明实施例提供的变换器的软开关saber仿真效果图。Figure 5 is a soft switching saber simulation effect diagram of the converter provided by the embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明作进一步描述。以下实施例仅用于更加清楚地说明本发明的技术方案，而不能以此来限制本发明的保护范围。The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to more clearly illustrate the technical solutions of the present invention, but cannot be used to limit the scope of the present invention.
实施例一：Example 1:
如图1所示，本发明提供了一种高增益隔离H桥式软开关DC-DC变换器，包括直流输入电压源、储能电感/>、钳位单元、第二储能电容/>、双耦合绕组以及整流输出单元；钳位单元包括第一开关管/>、第二开关管/>、第三开关管/>、第四开关管/>以及第一储能电容/>，第一储能电容/>一端连接至第一开关管/>和第四开关管/>的源极，另一端连接至第二开关管/>和第三开关管/>的漏极；双耦合绕组包括相互耦合的第一耦合电感/>和第二耦合电感；具体的连接关系为：As shown in Figure 1, the present invention provides a high-gain isolated H-bridge soft-switching DC-DC converter, including a DC input voltage source , energy storage inductor/> , clamping unit, second energy storage capacitor/> , double coupling winding and rectifier output unit; the clamping unit includes the first switch tube/> , the second switch tube/> , the third switch tube/> , the fourth switch tube/> And the first energy storage capacitor/> , the first energy storage capacitor/> One end is connected to the first switch tube/> and the fourth switching tube/> The source, the other end is connected to the second switch tube/> and the third switching tube/> The drain; the double coupling winding includes a mutually coupled first coupling inductor/> and the second coupled inductor ;The specific connection relationship is:
储能电感一端连接至直流输入电压源/>的正极，另一端连接至第一开关管/>的漏极、第三开关管/>的源极以及第二储能电容/>的正极，第二储能电容/>的负极连接至第一耦合电感/>的异名端，第一耦合电感/>的同名端连接至直流输入电压源/>的负极、第二开关管/>的源极以及第四开关管/>的漏极；整流输出单元包括第一二极管/>、第二二极管、第三储能电容/>以及第四储能电容/>，第一二极管/>的负极和第三储能电容/>的正极连接至负载/>的一端，第二二极管/>的正极和第四储能电容/>的负极连接至负载/>的另一端，第一二极管/>的正极和第二二极管/>的负极连接至第二耦合电感/>的异名端，第三储能电容/>的负极和第四储能电容/>的正极连接至第二耦合电感/>的同名端。Energy storage inductor Connect one end to the DC input voltage source/> The positive terminal, the other end is connected to the first switch tube/> The drain and the third switch tube/> The source and the second energy storage capacitor/> The positive electrode, the second energy storage capacitor/> The negative terminal of is connected to the first coupling inductor/> The opposite end, the first coupled inductor/> The same-name terminal is connected to the DC input voltage source/> The negative electrode and the second switch tube/> The source and the fourth switch tube/> The drain; the rectifier output unit includes a first diode/> , the second diode , The third energy storage capacitor/> And the fourth energy storage capacitor/> , the first diode/> The negative electrode and the third energy storage capacitor/> The positive terminal is connected to the load/> one end of the second diode/> The positive electrode and the fourth energy storage capacitor/> The negative terminal is connected to the load/> The other end of the first diode/> The anode and second diode/> The negative terminal of is connected to the second coupling inductor/> The opposite end, the third energy storage capacitor/> The negative electrode and the fourth energy storage capacitor/> The positive terminal is connected to the second coupling inductor/> of the same name.
具体在本实施方式中，第一开关管上还包括其第一体二极管/>和第一缓冲电容，第一体二极管/>的阳极和负极分别连接至第一开关管/>的源极和漏极，第一缓冲电容的负极和阳极分别连接至第一开关管/>的源极和漏极；第二开关管/>上还包括其第二体二极管/>和第二缓冲电容/>，第二体二极管/>的阳极和负极分别连接至第二开关管/>的源极和漏极，第二缓冲电容/>的负极和阳极分别连接至第二开关管/>的源极和漏极；第三开关管/>上还包括其第三体二极管/>和第三缓冲电容/>，第三体二极管/>的阳极和负极分别连接至第三开关管/>的源极和漏极，第三缓冲电容/>的负极和阳极分别连接至第三开关管/>的源极和漏极；第四开关管/>上还包括其第四体二极管/>和第四缓冲电容/>，第四体二极管/>的阳极和负极分别连接至第四开关管/>的源极和漏极，第四缓冲电容/>的负极和阳极分别连接至第四开关管/>的源极和漏极。Specifically, in this embodiment, the first switch tube Also includes its first body diode/> and the first snubber capacitor , first body diode/> The anode and cathode are respectively connected to the first switch tube/> the source and drain, the first snubber capacitor The cathode and anode are respectively connected to the first switch tube/> The source and drain of the second switch tube/> Also includes its second body diode/> and the second buffer capacitor/> , the second body diode/> The anode and cathode are respectively connected to the second switch tube/> The source and drain, the second buffer capacitor/> The cathode and anode are respectively connected to the second switch tube/> The source and drain; the third switch tube/> Also includes its third body diode/> and the third buffer capacitor/> , third body diode/> The anode and cathode are respectively connected to the third switch tube/> The source and drain, the third buffer capacitor/> The cathode and anode are respectively connected to the third switch tube/> The source and drain; the fourth switch tube/> Also includes its fourth body diode/> and the fourth buffer capacitor/> , the fourth body diode/> The anode and cathode are respectively connected to the fourth switch tube/> The source and drain, the fourth buffer capacitor/> The cathode and anode are respectively connected to the fourth switch tube/> source and drain.
具体在本实施方式中，第一开关管、第二开关管/>、第三开关管/>以及第四开关管/>均采用N沟道的MOS管。通过对MOS管的源极和栅极提供高低电平来控制其导通和关断。如：第一开关管/>、第二开关管/>、第三开关管/>以及第四开关管/>接收外部控制器的控制信号，控制信号为单极性PWM控制信号。Specifically, in this embodiment, the first switch tube , the second switch tube/> , the third switch tube/> And the fourth switch tube/> All use N-channel MOS tubes. By providing high and low levels to the source and gate of the MOS tube, it is controlled to turn on and off. Such as: the first switch tube/> , the second switch tube/> , the third switch tube/> And the fourth switch tube/> Receives the control signal from the external controller, and the control signal is a unipolar PWM control signal.
具体在本实施方式中，双耦合绕组等效为匝比的理想变压器、一次侧励磁电感/>、一次侧漏感/>和二次侧漏感/>。Specifically, in this embodiment, the double-coupled winding is equivalent to the turns ratio Ideal transformer, primary side excitation inductor/> , primary side leakage inductance/> and secondary side leakage inductance/> .
第一开关管、第二开关管/>、第三开关管/>以及第四开关管/>的控制信号，如图2所示，/>为第一开关管/>、第二开关管/>、第三开关管/>以及第四开关管/>的栅极输入；第一开关管和第二开关管为主开关管同时导通，第三开关管和第四开关管为辅助开关管同时导通，主开关管和辅助开关管互补导通。由于采用有源钳位的方式进行软开关，一次侧漏感/>与开关管缓冲电容/>谐振仅发生在主开关管和辅助开关管同时关断的时候，即PWM控制信号死区时刻。在控制信号死区时，一次侧漏感/>电流与输出电流/>的代数和流经开关管缓冲电容，使开关管上的缓冲电容进行完全的充放电，当缓冲电容完全放电时，开关管体二极管导通，从而实现了开关管的ZVS零电压导通，实现软开关的效果。The first switching tube , the second switch tube/> , the third switch tube/> And the fourth switch tube/> control signal, as shown in Figure 2,/> is the first switching tube/> , the second switch tube/> , the third switch tube/> And the fourth switch tube/> The gate input; the first switch tube and the second switch tube are turned on at the same time as the main switch tube, the third switch tube and the fourth switch tube are turned on at the same time as the auxiliary switch tube, and the main switch tube and the auxiliary switch tube are complementarily turned on. Due to the use of active clamping for soft switching, the primary side leakage inductance/> and switch tube snubber capacitor/> Resonance only occurs when the main switch and the auxiliary switch are turned off at the same time, that is, the PWM control signal dead zone moment. When controlling the signal dead zone, the primary side leakage inductance/> Current and output current/> The algebraic sum flows through the switching tube buffer capacitor, so that the buffer capacitance on the switching tube Perform complete charge and discharge. When the buffer capacitor is completely discharged, the switch body diode conduction, thus realizing the ZVS zero-voltage conduction of the switching tube and achieving the effect of soft switching.
在一个稳态工作周期中，主要存在2种工作模式。主开关管导通的工作状态示意图，如图3所示。在此时刻之前的死区内，由于第一开关管、第二开关管/>上的缓冲电容与一次侧漏感/>谐振，缓冲电容/>完全释放能量，第一、二开关管上反并联体二级管/>导通，故当第一、二开关管/>源极和栅极承受高电平触发信号时，便可ZVS零电压导通。第三开关管/>、第四开关管/>关断。第二二极管/>流经正向电流，由于漏感/>的存在，第二二极管/>ZVC零电流导通。第一二极管/>反向偏置。输入直流电压源/>和第一储能电容/>给储能电感/>充电，第一储能电容/>、第二储能电容/>给第一耦合电感/>正向充电，一次侧漏感/>上正向电流增大。同时电容/>通过变压器给电容/>充电，电容/>给负载R供电。In a steady-state working cycle, there are two main working modes. The schematic diagram of the main switch conduction working state is shown in Figure 3. In the dead zone before this moment, due to the first switching tube , the second switch tube/> buffer capacitor on and primary side leakage inductance/> Resonance, buffer capacitor/> Completely releasing energy, the first and second switching tubes Upper anti-parallel diode/> conductive, so when the first and second switching tubes/> When the source and gate receive a high-level trigger signal, they can be turned on at ZVS zero voltage. The third switch tube/> , the fourth switch tube/> Shut down. Second diode/> Forward current flows due to leakage inductance/> The presence of the second diode/> ZVC conducts at zero current. First diode/> Reverse bias. Input DC voltage source/> and the first energy storage capacitor/> For energy storage inductor/> Charging, the first energy storage capacitor/> , the second energy storage capacitor/> Give the first coupling inductor/> Forward charging, primary side leakage inductance/> The forward current increases. Simultaneous capacitance/> to the capacitor via the transformer/> charging, capacitor/> Supply power to load R.
主开关管关断的工作状态示意图如图4所示。第一开关管、第二开关管/>关断。在主开关管导通结束后的死区内，由于主开关管上流经正向电流，开关管缓冲电容/>与一次侧漏感/>谐振，缓冲电容/>充电，缓冲电容/>放电且完全释放能量，第三开关管/>、第四开关管/>上反并联体二级管/>导通，从而ZVS零电压启动。第一二极管/>流经正向电流，由于漏感/>的存在，第一二极管/>零电流导通。输入直流电压源/>和储能电感/>给第一储能电容/>和第二储能电容/>充电，一次侧耦合电感/>反向充电。第三储能电容/>充电，第四储能电容/>给负载R供电。当一次侧耦合电感/>上反向电流大于输入电流/>时，辅助开关管上电流换向，辅助开关管正向导通，流过正向电流，从而保证了下个循环中，辅助开关管上缓冲电容与漏感谐振充电，主开关管上电容与漏感谐振放电，保证主开关管能够ZVS导通。The schematic diagram of the working state of the main switch turned off is shown in Figure 4. The first switching tube , the second switch tube/> Shut down. In the dead zone after the main switch tube is turned on, due to the forward current flowing through the main switch tube, the buffer capacitance of the switch tube/> and primary side leakage inductance/> Resonance, buffer capacitor/> Charging, buffer capacitor/> Discharge and completely release energy, the third switch tube/> , the fourth switch tube/> Upper anti-parallel diode/> conduction, thus ZVS starts at zero voltage. First diode/> Forward current flows due to leakage inductance/> The presence of the first diode/> Zero current conduction. Input DC voltage source/> and energy storage inductor/> To the first energy storage capacitor/> and the second energy storage capacitor/> Charging, primary side coupled inductor/> Reverse charging. The third energy storage capacitor/> Charging, the fourth energy storage capacitor/> Supply power to load R. When the primary side coupled inductor/> The upper reverse current is greater than the input current/> When the current on the auxiliary switch tube reverses direction, the auxiliary switch tube conducts forward and flows in the forward direction, thus ensuring that in the next cycle, the buffer capacitor on the auxiliary switch tube and the leakage inductance are resonantly charged, and the capacitance on the main switch tube and the leakage inductance are resonantly charged. Induces resonant discharge to ensure that the main switch tube can be ZVS turned on.
对储能电感和第一、第二耦合电感/>、/>使用伏秒平衡法则，得到软开关DC-DC变换器的输出电压/>电压增益/>：energy storage inductance and the first and second coupling inductors/> ,/> Using the volt-second balance rule, obtain the output voltage of the soft-switching DC-DC converter/> Voltage gain/> :
； ;
； ;
式中，为主开关管占空比，/>为变压器匝比，/>。In the formula, is the main switch duty cycle,/> is the transformer turns ratio,/> .
该变换器由于电路拓扑结构的优越，使得能够在低于0.5的占空比下，获得较高的升压比，并且可以通过调节变换器匝比，从而避免产生极限占空比的情况，保证了电路的安全可靠性。Due to the superior circuit topology of this converter, it is able to obtain a higher boost ratio at a duty cycle lower than 0.5, and can be adjusted by adjusting the converter turns ratio. , thereby avoiding the occurrence of extreme duty cycle and ensuring the safety and reliability of the circuit.
图5为所提变换器的软开关saber仿真效果图，根据开关管电流电压波形图可以看出，4个开关管均实现了ZVS零电压启动软开关，一次侧耦合电感/>在开关管上的电压尖峰也被有效的抑制了，第一、第二二极管/>均实现了ZVC零电流启动。减小了开关管/>和二极管/>的开关损耗，保证了该电路具有较高的效率。Figure 5 is the soft switching saber simulation rendering of the proposed converter. According to the switch tube current and voltage waveform, it can be seen that the four switch tubes Both achieve ZVS zero voltage start soft switching and primary side coupled inductor/> The voltage spike on the switching tube is also effectively suppressed by the first and second diodes/> All achieve ZVC zero current start. Reduce the switching tube/> and diodes/> The switching loss ensures that the circuit has high efficiency.
上述分析表明，该电路由于储能电感保证了输入电流的连续，并且通过耦合电感实现了电气的隔离，具有更高的安全性和可靠性。同时通过对开关管的有源钳位和利用漏感能量进行谐振软开关，减小了开关管的电压应力和漏感产生的电压尖峰毛刺，并减小了开关管和二极管的损耗，提升了效率。变换器结构简单、优势明显，具有广泛的应用前景。The above analysis shows that due to the energy storage inductance of this circuit It ensures the continuity of the input current and achieves electrical isolation through the coupling inductor, which has higher safety and reliability. At the same time, through the active clamping of the switching tube and the use of leakage inductance energy for resonant soft switching, the voltage stress of the switching tube and the voltage spike burr generated by the leakage inductance are reduced, and the losses of the switching tube and diode are reduced, improving the efficiency of the switching tube. efficiency. The converter has a simple structure, obvious advantages, and has broad application prospects.
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统、或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质（包括但不限于磁盘存储器、CD-ROM、光学存储器等）上实施的计算机程序产品的形式。Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和变形，这些改进和变形也应视为本发明的保护范围。The above are only preferred embodiments of the present invention. It should be noted that those of ordinary skill in the art can also make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications It should also be regarded as the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311500358.6ACN117240103B (en) | 2023-11-13 | 2023-11-13 | High-gain isolation H-bridge type soft switch DC-DC converter |
| Application Number | Priority Date | Filing Date | Title |
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| CN202311500358.6ACN117240103B (en) | 2023-11-13 | 2023-11-13 | High-gain isolation H-bridge type soft switch DC-DC converter |
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| CN117240103Atrue CN117240103A (en) | 2023-12-15 |
| CN117240103B CN117240103B (en) | 2024-01-30 |
| Application Number | Title | Priority Date | Filing Date |
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| CN202311500358.6AActiveCN117240103B (en) | 2023-11-13 | 2023-11-13 | High-gain isolation H-bridge type soft switch DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119362902A (en)* | 2024-12-25 | 2025-01-24 | 西安麦格米特电气有限公司 | Power supply regulation circuit and method, power supply conversion circuit, and electronic equipment |
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| KR101552284B1 (en)* | 2014-04-21 | 2015-09-11 | 서울과학기술대학교 산학협력단 | An isolated single-switch DC-DC converter |
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| XINPING DING等: "A High Step-Up Coupled-Inductor-Integrated DC–DC Multilevel Boost Converter With Continuous Input Current", 《IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS》, vol. 10, no. 6, pages 7346 - 7360, XP011929731, DOI: 10.1109/JESTPE.2022.3184699* |
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119362902A (en)* | 2024-12-25 | 2025-01-24 | 西安麦格米特电气有限公司 | Power supply regulation circuit and method, power supply conversion circuit, and electronic equipment |
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| CN117240103B (en) | 2024-01-30 |
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