| 1. | First , a half - bridge dc / dc converter with modified pwm controlled method is introduced in this paper . compared with conventional half bridge topology , a branch comprising an auxiliary switch and a diode is added
与传统半桥电路相比,改进pwm控制zvs半桥变换器增加了一个由辅助开关管和一个二极管组成的支路。 |
| 2. | Introduce the torque control starting way and it ' s control strategy emphatically chapter three introduce the hardware design of the soft - starter , including the main circuit , control circuit , auxiliary switch power circuit design in detail
第三章详细介绍了软起动控制器的硬件设计，包括主电路、控制电路和辅助开关电源电路的分析和设计。 |
| 3. | The control logic of the auxiliary switches is much simple . based on the analysis of the proposed inverter , the zero - transition condition is obtained . a prototype is made verifying the feasibility of the new inverter
通过对提出电路工作原理的详细分析，给出了该电路功率开关器件零电压过渡条件，在此基础上研制了一台原理样机，验证了提出的方法的可行性。 |
| 4. | However , these converters become more complicate . phase - shift bi - directional dc - dc converter is attractive since it operates with fixed frequency , has small voltage and current stress and can realize zvs without auxiliary switches
相移控制双向dc - dc功率变换器因具有功率器件电压,电流应力小,定频工作和无须增加辅助器件即可实现功率器件的零电压开关条件等优点而受到关注。 |
| 5. | A new control method , which can reduce the switching number of times of auxiliary switches to one half , is put forward . the new approaches are verified by experimentation . a generalized method to design a soft - switching vvvf is also discussed in the end
此外，还提出了一种软开关技术变频器的具体设计方法，该设计方法具有一般性，可以推广应用到不同容量的软开关变频器设计中。 |
| 6. | The auxiliary switch conducts when the two main switch turn off , and it also operates at zcs conditions . this switch not only helps the main switches achieve zvs , furthermore , it eliminates the oscillation between the transformer leakage inductance and the junction capacitance of two switches
辅助开关管为主开关管实现zvs创造了条件,同时辅助开关管在主开关管关闭期间实现zcs导通,大大减轻了变压器漏感和主开关管结电容之间的振荡。 |
| 7. | However these converters become more complicate . phase - shift zvs technique has been used in bidirectional dc / dc converters since it can realize zvs for all switches without auxiliary switches . however when the amplitude of input voltage is not matched with that of output voltage , the current stresses and rms currents of the converters become higher , in addition the converters can not achieve zvs under light - load condition
谐振、准谐振或多谐振技术方案，变换器的电压电流应力较高，变频控制增加了滤波器设计的难度；能量缓冲吸收电路或有源钳位电路方案，由于需要增加多个额外辅助元件，增加了变换器的复杂性；全桥相移技术方案，由于主电路无需增加额外元件，只需利用相移控制，即可实现软开关，因此引起关注。 |
| 8. | An auxiliary switch is added , it is integrated with handler of the isolation switch , grounding switch . the maintenance for the auxiliary switch can be carried out in the maintenance room . there are interlock between the door and isolation switch or the grounding switch , only after the isolation switch is open or the grounding switch is closed , the door can be opened , it is the unique characteristics of the substation
另外我们生产的智能型箱式开关站采用了强制性的jsxgn型的机械闭锁；为了简化结构，提高可靠性，也对其进行了设计改进：增加了辅助开关，使其与隔离开关、接地开关的操作手柄为一体，并可在维护走廊对辅助开关进行检修；箱体的门板与隔离开关或接地开关之间也有连锁，只能在隔离开关打开后或接地开关闭合后，才能被打开；此结构也是本开关站所独有。 |
| 9. | Compared with those converters that need an auxiliary switch to make the main switching device working in soft - switching condition , the converters this paper present , are simple , easily controlled and cost less , but still maintain the merits of soft - switching for the main switching devices
这些变换器与那些需要辅助开关来实现主开关的软开关工作的变换器相比，具有结构简单、易于控制、成本较低的优点。所提出的新型功率因数校正软开关变换器除具有以上优点外，还能有效解决二极管的反向恢复所带来的问题。 |
| 10. | Taking single four - quadrant power switch mode circuit as an example , the operational mode , steady principles , transient voltage feedback control strategy , the auxiliary switching power supply and parallel technology of this kind of converters are investigated . the output characteristic curve and the design for the key circuit parameters are given
以单四象限功率开关式电路拓扑为例，分析研究了这类变换器工作模式、稳态原理与电压瞬时值反馈控制策略，给出了变换器的外特性曲线、关键电路参数、机内辅助开关电源的设计，对电流源高频交流环节ac ac变换器并联扩容技术进行了研究。 |
