Power Semiconductor Devices. Xi Liu Biomedical Engineering ECE423. Introduction. What are Power Semiconductor Devices (PSD)? They are devices used as switches or rectifiers in power electronic circuits What is the difference of PSD and low-power semiconductor device?
They are devices used as switches or rectifiers in power electronic circuits
Fig. 1. The power semiconductor devices family
Trade-off between breakdown voltage and on-resistance.
Power MOSFET has much higher current handling capability in ampere range and drain to source blocking voltage(50-100V) than other MOSFETs.
Fig.2.Repetitive pattern of the cells structure in power MOSFET
An important parameter of a power MOSFET is on resistance:
Fig. 3. Typical RDS versus ID characteristics of a MOSFET.
Fig.4 (a) The basic four-layer pnpn structure.
(b) Two two-transistor equivalent circuit.
Fig.5 The current-voltage characteristics of the pnpn device.
Power semiconductor devices have widespread applications:
Alternator, Regulator, Ignition, stereo tape
Power supplies, stereo, radio and television
Drill motors, Blenders, Mixers, Air conditioners and Heaters
Table. 1. Power Devices in automotive systems.
For future power conversion applications, new semiconductor devices are needed to be developed.
Insulated Gate Bipolar Transistor (IGBT), static induction transistor (SIT) and MOS-controlled thyristor (MCT) .
2. Material Improvement
Silicon carbide (SiC), with a higher field characteristic, is a promising candidate for high power, high temperature and high frequency applications.
The development of power semiconductor devices is very essential for modern electronics. The power devices based on new structures and materials are promising and commercially realistic for future electronic developments.