2
Power
Chapter 1
Positive voltage The anode of thyristor Positive pulse Negative pulse Direct current Holding current IH ？ Latching up current IL ？ Peak forward surge current ITSM (Thyristor parameter)浪涌电流 Average rectified forward current IF(AV) （diode parameter）正向平均电流
5
Power
Chapter 1
lost its function secondary breakdown Turn-on snubber Turn-off snubber Overvoltage Overcurrent the interface between between A and B even voltage sharing even current sharing
– Power dissipating snubber – Lossless snubber
8
Power
Chapter 2
Single-phase half-wave controlled rectifier Single-phase bridge fully-controlled rectifier Three-phase half-wave controlled rectifier Three-phase bridge fully-controlled rectifier The range of phase-shift ？ Resistive load Inductive load Resistor and inductor load Resistance-inductive load
1
Power
Chapter 1
Highest frequency? Largest capability? Anode ,Cathode, Gate Keep thyristor conducting? Turn on? Turn off? The triggering signal Gate dissipation
3
Power
Chapter 1
Gate drive circuit Control circuit Power stage Electrical isolation Optical isolation Magnetic isolation
4
Power
Chapter 1
Primary functions Snubber circuits？ RCD snubber circuits？ Series ,parallel Steady-state voltage sharing？ Steady-state current sharing? Element Resistance Capacitance Inductance
Chapter 1
Power electronic devices power semiconductor devices Uncontrolled devices:diode Half controlled devices:thyristor Typical fully-controlled devices: GTO, GTR, power MOSFET, IGBT Current-driven (current-controlled) devices: thyristor, GTO, GTR? Voltage-driven (voltage-controlled) devices (Field-controlled devices):power MOer
Chapter 1
The principal differences lie in the modifications in the structure achieve gate turn-off capability. Basic structure similar to power MOSFET except extra p region According to the treatment of energy
9
Power
Chapter 2
Reverse voltage Forward voltage The maximum of reverse voltage of thyristor？ Average output voltage？ Average output current？ Effective value ？ Transformer quadratic side The effective value of transformer quadratic side current？
6
Power
Chapter 1
Gate anode cathode Drain source Emitter collector Terminals turned-on by a control signal turned-off by the power circuit on and off states of the device
10
Power
Chapter 2
The start point of triggering delay angle？ Natural commutation point Transformer rectifier Commutation angle (γ)? generated and change The inverter mode operation of controlled rectifiers? The necessary conditions? Inverter mode operation of 3-phase bridge rectifier The minimum inversion angle (extinction angle)? Connection of multiple rectifiers? Reduce harmonics