Low dissipation voltage regulator
First Claim
1. A DC voltage regulator having first and second input terminals and first and second output terminals, the second input terminal and second output terminal being in common, and the output terminals having developed therebetween a constant direct output voltage unaffected by variations in direct input voltage applied between the input terminals, said regulator comprising:
- a first transistor having a base, emitter and collector, the collector of the first transistor being connected to the first output terminal;
a first resistor connected between the base-emitter of the first transistor;
a second transistor having a base, emitter, and collector, the collector of the second transistor being connected to the first input terminal, the base of the first transistor being connnected to the base of the second transistor and the emitter of the second transistor being connected to the first output terminal;
a second resistor connecting the first transistor emitter to the first input terminal; and
a voltage reference device connecting the two bases to the second terminals.
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Abstract
The disclosed voltage regulator circuit provides a regulated direct output voltage, across first and second output terminals, when an unregulated direct input voltage is applied across first and second input terminals. The second terminals are common to both input and output connections. A voltage reference device, having first and second electrodes, is connected so that the second electrode is connected to the second terminals. A first DC amplifier has an input circuit connected between the first input terminals and the first electrode, and an output circuit connected between the first output terminals and the first electrode. A second DC amplifier has an input circuit connected to the input circuit of the first DC amplifier and an output circuit connected to the output circuit of the first DC amplifier. The second DC amplifier, besides sharing the current load requirements with the first DC amplifier, also controls a bias current through the voltage reference device. The voltage reference device provides both amplifiers with a constant reference voltage enabling the amplifiers to maintain a constant output voltage despite changes in input line voltage.
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Citations
2 Claims
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1. A DC voltage regulator having first and second input terminals and first and second output terminals, the second input terminal and second output terminal being in common, and the output terminals having developed therebetween a constant direct output voltage unaffected by variations in direct input voltage applied between the input terminals, said regulator comprising:
a first transistor having a base, emitter and collector, the collector of the first transistor being connected to the first output terminal;
a first resistor connected between the base-emitter of the first transistor;
a second transistor having a base, emitter, and collector, the collector of the second transistor being connected to the first input terminal, the base of the first transistor being connnected to the base of the second transistor and the emitter of the second transistor being connected to the first output terminal;
a second resistor connecting the first transistor emitter to the first input terminal; and
a voltage reference device connecting the two bases to the second terminals.- View Dependent Claims (2)
Specification
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- Resources
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Current AssigneeMicrotel Limited-Microtel Limitee
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Original AssigneeGTE Lenkurt Electric Canada Ltd (Verizon Communications Inc.)
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InventorsHuntley, Christopher Ryland
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Primary Examiner(s)Pellinen, A. D.
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Application NumberUS05/784,552Time in Patent Office477 DaysField of Search307/296, 307/297, 323/19, 323/22 T, 323/22 Z, 323/23, 323/25, 323/39US Class Current323/303CPC Class CodesG05F 3/18 using Zener diodes
