Patent US3602797A successfully refreshed from Google Patents.
US3602797A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage regulator,particularly for construction as an integrated circuit
Assignee: Robert Bosch GmbH
•
Filing: 1969-05-01
•
Granted: 1971-08-31
•
Expires: 1989-05-01
Abstract
Abstract An automotive type voltage regulator includes a differential amplifier having push-pull inputs applied thereto; the voltage divider is formed as a bridge circuit which includes voltagesensitive elements, unbalance at the bridge triggering the differential amplifier to supply an output potential to a preamplifier with low frequency amplification characteristics to control a switching transistor in series with the field of an automotive generator. The low frequency transistor, formed of a pair of complementary transistor subunits, suppresses high frequency spurious oscillations and itself forms a PNP transistor complementary to an NPN transistor; both transistors form the input stage connected to the differential amplifier, to supply a symmetrical load to the differential amplifier.
Inventors
- 👤 Johannes Hartmut Bleher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:29
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/16; H02J7/24; H02J7/243
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
179 words
A voLtage regulator for a generator having a field winding and direct current output terminals connected to said generator; a voltage divider circuit adapted for connection to, and sensing the output voltage of the generator; a controllable semiconductor switching element adapted for connection to control the current through said field winding and being controlled in dependence on sensed output voltage appearing across said voltage divider; a differential amplifier circuit having its input connected to said voltage divider, said differential amplifier comprising a two-stage amplifier having a pair of input transistors and a push-pull connected pair of output transistors, one each of the input transistors being connected to an input of the differential amplifier and having its output, each, connected to a respective input of a respective push-pull output transistor; the push-pull output transistor being connected to provide a single ended output to said semiconductor switching element, the outputs of said input transistors being symmetrically connected to the inputs of said push-pull transistors, to provide for balanced loading of the inputs to said differential amplifier on said voltage divider circuit.
Claim 2
Dependent Claim
179 words
A voLtage regulator for a generator having a field winding and direct current output terminals connected to said generator; a voltage divider circuit adapted for connection to, and sensing the output voltage of the generator; a controllable semiconductor switching element adapted for connection to control the current through said field winding and being controlled in dependence on sensed output voltage appearing across said voltage divider; a differential amplifier circuit having its input connected to said voltage divider, said differential amplifier comprising a two-stage amplifier having a pair of input transistors and a push-pull connected pair of output transistors, one each of the input transistors being connected to an input of the differential amplifier and having its output, each, connected to a respective input of a respective push-pull output transistor; the push-pull output transistor being connected to provide a single ended output to said semiconductor switching element, the outputs of said input transistors being symmetrically connected to the inputs of said push-pull transistors, to provide for balanced loading of the inputs to said differential amplifier on said voltage divider circuit.
Claim 3
Dependent Claim
48 words
Regulator according to claim 1, wherein the push-pull connected transistors form the second stage of said differential amplifier; and one transistor (46) has low-frequency cutoff characteristics, whereby high frequency oscillations due to inherent reactances in the generator and the voltage regulator, connected thereto, are not amplified but suppressed.
Claim 4
Dependent Claim
84 words
Regulator according to claim 2 wherein said transistor with low-frequency amplification characteristics comprises a pair of complementary transistor elements (FIG. 2), the emitter of said transistor being formed by the emitter connection of one transistor element and the collector of a complementary transistor element; the collector of said transistor being formed by the emitter of said complementary element; and base of said complementary transistor element and the collector being interconnected; the base of said transistor being formed by the base of said transistor element.
Claim 5
Dependent Claim
27 words
Regulator according to claim 3 wherein said push-pull amplifier stage comprises a pair of complementary transistor units (46, 47) having a symmetrical input and a single-ended output.
Claim 6
Dependent Claim
91 words
Regulator according to claim 1 wherein the second stage of said differential amplifier comprises a pair of complementary transistors (46, 47) and resistance components (76, 77, 78); the first stage of said differential amplifier comprises a pair of transistors (43, 44) and resistance elements (73, 74); and a constant current source is provided supplying said transistors of the differential amplifier and providing a sensing potential therefore and including a transistor (45) and at least one resistance element; said transistors and said resistance elements being formed as a single monolithic integrated circuit.
Claim 7
Dependent Claim
22 words
Regulator according to claim 5, wherein at least one of said push-pull transistors has a low-frequency cutoff characteristic to suppress spurious oscillations.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |