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Multiple application voltage regulator system and method
| Details |
Inventors: DeNardis, Nicholas F.;
Assignee: Transpo Electronics, Inc. (Orlando, FL)
Primary Examiner: Stephan; Steven L.
Assistant Examiner: Dougherty; Thomas M.
Attorney, Agent or Firm: Allen, Dyer, Doppelt, Franjola & Milbrath
A single integrated circuit for multiple vehicle voltage regulator applications is inexpensive, programmable and responsive to mixed signals. The integrated circuit provides both analog and digital functions, and uses a single voltage comparator serving all comparator functions. A variety of features are included with the single integrated circuit in order to permit the programmable, mixed signal and multiple application characteristics of the device. Among the features are the provision for a single voltage comparator that serves all comparator functions, logic gates for preventing the simultaneous activation of fixed reference divider analog switches to eliminate current transients, the use of a single TC diode for thermal shut down and multiple temperature compensation curves with different voltage versus temperature rate of change parameters, a single band gap referenced shunt regulator circuit to serve as both a power source to the integrated circuit and as a precision reference voltage for the comparator, and a selectable load control function to gradually apply the field voltage at a programmable rate consisting of reversible and "up" binary counters with associated logic to prevent abrupt torque loads on the driving engine caused by the activation of electrical loads. |
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DETAILED DESCRIPTION The following discussion assumes that the reader has a basic understanding of the manner of operation for basic electronic circuit components, such as transistors, resistors and capacitors.
CIRCUITS OF FIG.
1 FIG.
1 is a composite drawing depicting representative applications with which the mixed signal application-specific integrated circuit ("ASIC") 3x of FIG.
1f is designed to work.
FIG.
1a shows a well-known delta connected stator 1a, with the accompanying diode rectifiers 1b and the noise suppression capacitor 1c.
The stator phase output at "D" is a square wave voltage nearly equal in peak amplitude to the average voltage developed at output "A".
The frequency of the stator output "C" is equal to the number of stator poles times the number of revolutions the field coil 2a shown in FIGS.
1c, 1d, or 1e is rotated per second.
The engine rotating said field coil is not shown.
The basic stator circuit of FIG.
1a may or may not be equipped with the auxiliary diodes 1d.
The auxiliary diodes 1d, commonly referred to as the diode trio in the trade provide an isolated energy source for the field circuit as one means of avoiding field current through the ignition switch 2d of FIG.
1c.
FIG.
1b is identical to FIG.
1a with the exception that the three stator coils Ia are connected in the wye configuration.
The neutral wye phase output "C" is also a square wave of the same frequency as the delta connected stator as shown in FIG.
1a, but the peak amplitude of the square wave at terminal "C" in FIG.
1b is nearly 1/2 of the average voltage appearing at the output terminal "A" in FIG.
1b.
FIG.
1c shows a version of the field circuit.
With terminal "B" grounded, one end the field winding 2a is connected to the ungrounded main or auxiliary rectifier output.
This connection is normally made internally in the alternator and in the trade is called an "A" type field circuit.
The field winding switching transistor 2c can either be a Darlington connected NPN bipolar transistor as shown in this figure or it can be an N-channel power MOSFET type transistor
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Electrical and Wave 
