Solid state voltage regulator

• US 3,967,186 A
• Filed: 02/03/1975
• Issued: 06/29/1976
• Est. Priority Date: 02/03/1975
• Status: Expired due to Term

• Current Assignee: Solitron Devices, Inc.
• Original Assignee: Solitron Devices, Inc.
• Inventors: Adams, Guy
• Primary Examiner(s): Miller, J D
• Assistant Examiner(s): Hickey, Robert J.
• Application Number:
  US05/546,550
• Time in Patent Office: 512 Days
• Field of Search: 320/61, 320/64, 320/68, 320/32, 320/35, 320/36, 322/28, 323/22 T
• US Class Current: 322/28
• CPC Class Codes: H02J 7/243 with on/off action

Abstract

A solid state voltage regulator for an alternator charging system having a zener diode controlled transistor operatively connected to a integrated Darlington chip.

Claims

1. A solid state voltage regulator comprising in combination:

source input and output terminals;

a charging means terminal;

a measuring circuit of series connected resistances between said source input and output terminals;

a first transistor between said source input and output terminals, said first transistor having a base emitter diode point providing a positive temperature coefficient;

a resistor circuit between a base of said first transistor and the said source output terminal to provide source stability for said first transistor;

a Miller effect circuit between said source input terminal and said base of said first transistor to provide high frequency stability;

a second transistor means including two transistors in a Darlington circuit in a single chip of semiconductor material to avoid mismatching of base emitter diode operating points of discrete transistors while providing consistancy with said first transistor, said second transistor means being between said source input and output terminals and being operatively connected to said first transistor, said second transistor means having its common collector output connected to said charging means terminal;

a diode means between said charging means terminal and said input terminal to provide a return path for decay in field from said charging means terminal;

a voltage reference zener diode connected between said first transistor and said measuring circuit between said series connected resistances, said zener diode having a base emitter diode point such as to provide a negative temperature coefficient to in combination with said first transistor positive temperature coefficient and the consistant base emitter diode operating point of said second transistor means provide a means to predetermine temperature compensation and provide the required voltage per °

C for any known temperature excursion; and

a diode connected between said source output terminal and said source input terminal to provide reverse transient protection for said voltage regulator.