Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1994-06-14
1996-07-30
Shoop, Jr., William M.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
320 61, 322 28, 327403, H02P 900
Patent
active
055414567
ABSTRACT:
The contrasting requirements of low power consumption during operation and ability to function under drastic drops of the supply voltage at start-up of output power stages of an electric system of self-generation and recharge of a storage battery, are satisfied by an output power driving stage composed of a bipolar transistor and a field effect transistor, functionally connected in parallel to each other and having independent control terminals. A control signal is selectably switched either to the base of the bipolar output transistor or to the gate of the field effect output transistor, depending on the level of the supply voltage. A comparator comparing the voltage present on the supply node with a reference voltage controls a selection switch. The low threshold of the bipolar transistor ensures functioning at start-up, while the field effect transistor provides a low power consumption during normal running conditions.
REFERENCES:
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patent: 4362983 (1982-12-01), Mori et al.
patent: 4488105 (1984-12-01), Papazian
patent: 4694238 (1987-09-01), Norton
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Patent Abstracts of Japan, vol. 5, No. 78 (E-58) May 22, 1981 & JP-A-56 025 373 (NEC Corp) Mar. 11, 1981 *abstract*.
Maggioni Giampietro
Morelli Marco
Elms Richard T.
Formby Betty
Groover Robert
SGS-Thomson Microelectronics S.R.L.
Shoop Jr. William M.
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