| 1. | On binary - ended forward converter with constant frequency zero voltage transition
恒频零电压转换双端正激变换器研究 |
| 2. | Zero voltage resistance
零压电阻 |
| 3. | At the end , a half - bridge dc / dc transformer with zero voltage switching ( zvs ) is presented
最后本文研究了一种半桥软开关直流变压器电路。 |
| 4. | Finally , the operation principle of three - level shift phase pwm control with zero voltage is validated by the simulation analyze and the debugging experiment of 230v / 10a sample device
最后，通过仿真分析以及对230v / 10a样机的调试实验，验证了零电压三电平移相控制pwm三电平直流变换器的工作原理。 |
| 5. | In all interleaving two - transistor forward switches , zero voltage switching can be obtained which can apparently improve the power density . however the isolated boost converters need to resolve two problems
但是隔离boost变换器需要重点解决两个问题: 1 )减小功率开关关断时两端浪涌电压; 2 )隔离boost变换器的起动。 |
| 6. | On the detailed analysis of pmsm dtc principle , the function of zero voltage vector and the choice method of voltage vector in ev driving are proposed . restricted condition about stator flux linkage under dtc is analyzed
在详细分析dtc应用于pmsm的基本原理基础上，研究了零电压矢量在pmsmdtc中的作用并提出电动汽车用pmsm电压空间矢量的选择方法。 |
| 7. | 2 . we present a novel de - rail parallel resonant zero voltage transition three - phase pwm voltage - source inverter which is based on resonant zero voltage ( zero current ) transition technique ; at the same time it ' s efficiency analysis and simulation result are presented . 3
把谐振过渡软开关技术应用于直流环节逆变器得到了一种新的谐振过渡软开关逆变器；论文对该新型谐振过渡软开关逆变器进行了工作原理、效率分析并对主电路进行了仿真。 |
| 8. | The whole high power switch supply have four bidirectional dc / dc converters which are parallel connection . the theory of phase - shifted full - bridge zvs pwm dc / dc converter and the theory of push - pull boost converter are introduced . the methods of realize zvs ( zero voltage switching ) is studied in detail
文中介绍了移相全桥式软开关变换及推挽式dc dcboost变换的工作原理，分析了移相全桥zvs的实现和占空比的丢失，并设计了各自的控制电路和保护电路。 |
| 9. | Traditional direct torque control uses two value torque regulator which makes zero voltage vector work long and make flux shape bad seriously and makes response time long when the speed of induction motor is very low or drops down quickly . in order to solve this problem the thesis puts forward a new way to use three - value torque regulator , when the motor speed is very low or drops down quickly , the contrary voltage vector is used instead of zero voltage vector and the between the stator flux and rotor flux is reduced quickly so that torque is reduced quickly and response time becomes shorter
为此，本论文提出三点式转矩调节，这样当电机低速运转或给定转速突降时，不是加零电压矢量，而是加反方向的电压矢量，使定子磁链与转子磁链之间的夹角迅速减小，从而使电磁转矩也迅速减小，大大减小了调速时间，同时磁链值仍然保持基本恒定，输出比较稳定的电磁转矩，这在电机制动过程中非常有用。 |
| 10. | A topology of asymmetrical half bridge soft switching is researched in this thesis , which has inherent zero voltage switching ( zvs ) capability and thus potentially higher efficiency by its resonating of the leakage of power transformer with the parasitic capacitances of the power mosft switches , whereas it does n ' t raise the expense of the converter these studies in the thesis have been done as follows : ( 1 ) the topology of asymmetrical half bridge is introduced , and its principle and the relation of duty cycle and input voltage and output voltage discussed , the method of eliminating the deflection magnetism is also brought forward
虽然，软开关技术能够实现功率变换器的小型化、模块化等，但是，电路变得更加复杂，使得中小功率的变换器的成本增加，往往不利于商业竞争。本文研究了一种零电压的不对称半桥拓扑结构，它可以在不增加电路成本的基础上，利用电路自身的特点，实现软开关。本文所做的主要工作如下： ( 1 )对不对称半桥主电路工作原理进行分析，给出了占空比与输出电压、输入电压的关系以及消除变压器偏磁的方法。 |
