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Extra resources for Lessons in electric circuits 3 - Semiconductors
Storage temperature range = TST G , the range of allowable temperatures for storing a diode (unpowered). Sometimes given in conjunction with operating junction temperature (T J ), because the maximum storage temperature and the maximum operating temperature ratings are often identical. If anything, though, maximum storage temperature rating will be greater than the maximum operating temperature rating. Thermal resistance = R(Θ), the temperature difference between junction and outside air (R(Θ) JA ) or between junction and leads (R(Θ)JL ) for a given power dissipation.
The harmonic content of the rectifier’s output waveform is very large and consequently difficult to filter. Furthermore, AC power source only works to supply power to the load once every half-cycle, meaning that much of its capacity is unused. Half-wave rectification is, however, a very simple way to reduce 48 CHAPTER 3. DIODES AND RECTIFIERS power to a resistive load. Some two-position lamp dimmer switches apply full AC power to the lamp filament for ”full” brightness and then half-wave rectify it for a lesser light output: Bright Dim AC voltage source In the ”Dim” switch position, the incandescent lamp receives approximately one-half the power it would normally receive operating on full-wave AC.
V Connecting the diode backwards to this testing circuit will simply result in the voltmeter indicating the full voltage of the battery. If this circuit were designed so as to provide a constant or nearly constant current through the diode despite changes in forward voltage drop, it could be used as the basis of a temperaturemeasurement instrument, the voltage measured across the diode being inversely proportional to diode junction temperature. Of course, diode current should be kept to a minimum to avoid self-heating (the diode dissipating substantial amounts of heat energy), which would interfere with temperature measurement.