In the applications of power electronics, converters and inverters play a very crucial role. The conversion of AC to DC or DC to AC is always an important phenomenon in the field of power electronics as well as in day-to-day life. In general terms, all the devices that convert power from one form to another … Read more
In this article, we will see the analysis of Single Phase Half Wave Uncontrolled Rectifier with Resistive (R) Load as shown in Figure 1. Vs is supply and ‘is‘ is the source current. VD and ‘iD‘ is the diode voltage and current respectively. Vo and ‘io‘ is the load voltage and current respectively. Vs = Vmsin(ωt) Step-1: … Read more
In this article, we will see the analysis of Single Phase Half Wave Controlled Rectifier with Resistive (R) Load as shown in Figure 1. Vs is supply and ‘is‘ is the source current. VT and ‘iT‘ is the SCR voltage and current respectively. Vo and ‘io‘ is the load voltage and current respectively. Vs = Vmsin(ωt) Step-1: … Read more
For the normal working of Silicon controlled rectifier (SCR), the operating conditions should not exceed SCR’s specified ratings. But practically, the SCR may be subjected to abnormal conditions such as overvoltages, overcurrent, high dv/dt, high dI/dt and excessive heating. This may lead to the SCR to work abnormally and may cause unwanted turn-on or permanent … Read more
A switch is an electrical component that can “make” or “break” an electrical circuit. A switch mainly works with ON and OFF mechanism. Types of Switches 1. Ideal Switch 2. Practical Switch Ideal Switch 1. It should have zero resistance or zero voltage drop in ON state and infinite resistance or zero current during OFF … Read more
Power electronics is a combination of two main branches of engineering i.e. power and electronics engineering. Power engineering deals with the generation, transmission, distribution, and utilization of electric energy at high power level whereas electronic engineering deals with the production, transmission, and reception of signals & data at the low power level. Power engineering machines/apparatus … Read more
Power quality refers to maintaining the near sinusoidal waveform of power distribution bus voltages and currents at rated magnitude and frequency. Power quality describes the extent of variation of the voltage, current, harmonics, and frequency of the power system. The poor power quality effects industrial competitiveness drastically and thereby impedes our efforts to turn into … Read more
A ground fault circuit interrupter (GFCI) is a device that cuts off an electric power supply when it detects the ground fault in the system and hence prevents the system from severe damage. The GFCI monitors the current flowing into different phases and neutral. It turns off the power supply by sending a tripping signal … Read more
Q. Compare suitability of Si, SiC, GaN, and Sapphire being used for Modern Power Semiconductor Devices? Ans. S.No. Characterisitcs Si SiC (3H)/SiC (6H) GaN Sapphire 1. Energy gap at 300K (eV) 1.12 2.23/2.9 3.2 5.47 2. Maximum operating temperature (°C) 300 873/1240 600 1100 3. Mobility at 300 K — electron — Hole 1350 430 … Read more
S.No. Characterisitics Thyristor MOSFET IGBT 1. Type of Device Minority carrier Majority carrier Minority carrier 2. Rating very high Voltage, very high Current Medium Voltage, high Current high Voltage, high Current 3. Switching frequency low very high (~ MHz) high (~ 100kHz) 4. On-state drop low higher (increasing) low 5. On-state losses low considerable less … Read more
