Carbon pile Regulator Cross Section
Carbon Pile Regulator Schematics UNIT 7 ELECTRONIC VOLTAGE REGULATOR
AIM OF THE UNIT: - to describe electronic voltage regulator
TASKS 1 Do your best to answer the brainstorming questions. 2 Read the text for general understanding. 3 Make up questions to the text. 4 Find the sentences with the new words in the text. Give the Kazakh or Russian equivalents of the words. 5 Write sentences with the new vocabulary. 6 Make up exercises as in the UNIT 2page 210 (Exercises for better remembering the topic).7 Speak on the topic. Given schemes will help you to remember and understand the topic. 8 Find more information about the topic and make up a project work on the topic.
1 What types and configurations of electronic voltage regulators do you know?
There are many types and configurations of electronic voltage regulators. The alternator master switch used in AC systems energizes the field relay and applies current to the base of TR 2 and the resistor network of R 1, R 2, RV1. This network, together with the Zener diode (Z) is used to establish the nominal operating voltage. Current flows through the alternator’s field coil via transistors TR 2 and TR 3, allowing the generator’s output to increase. When the output reaches its specified value (14 or 28 V DC depending on the installation) Zener diode Z conducts which turns on transistor TR1, shorting out transistor TR 2 and TR 3. The generator voltage falls and Zener diode Z stops conducting, thereby turning of transistor TR 1. This turns transistors TR 2 and TR 3 back on, allowing the generator output to increase again. This operation is repeated many times per second as with the vibrating contact regulator; the difference being that electronic circuits have no moving parts and do not suffer from arcing across contacts. Diode D1 provides protection against the back e.m.f. induced in the field each time TR 3 is switched. The trimming resistor R V1 can be used to adjust the nominal voltage output of the regulator.
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