An overcurrent exists
when current exceeds
the rating of conductors
or equipment. It can
result from overload,
short circuit, or ground
An overload is a
condition in which
current exceeding their
Patrick Collins, Exercise 2.1, 3.1, and Discussion 3.1
The measured values of a diode at a temperature of 25C are
VD = 1.2V at ID = 100A
VD = 1.6V at ID = 1500A
Determine (a) the emission coefficient n, and (b) the leakage current IS.
Patrick Collins, Power Electronic, Discussion 3.1
Case temperature allows for a specific location on the device to be designated as a temperature test
point there is no confusion when it comes to temperature testing in the field. It is th
Patrick Collins, Power Electronics, Exercise 1.1
What is a heat sink?
A device or substance for absorbing excessive or unwanted heat.
What is a heat pipe?
A heat pipe is a heat-transfer device that combines the principles of both thermal conductivity
Patrick Collins, Power Electronics, Page 279
5.1: Converting the unregulated DC input to a controlled DC output with a desired voltage level.
5.2: A high-frequency triangular current signal which is smoothed by a small capacitor in the output
Single-phase half-bridge inverter
3-wire DC source
Consists of 2 choppers, 3-wire DC source
Transistors switched on and off alternately
Need to isolate the gate signal for Q1 (upper device)
Each provides opposite polarity of Vs/2 a
Patrick Collins, PAGE 356
6.1 The inverter is a dc-ac converter. This converter takes a DC input and changes it to an AC output of
desired frequency and magnitude.
6.2 This converter takes a DC input and changes it to an AC output of desired frequency and