Patent US3876920A successfully refreshed from Google Patents.
US3876920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for combined regenerative and resistive braking operation for a d-c series machine operated as a generator
Assignee: Siemens AG
•
Filing: 1974-01-10
•
Granted: 1975-04-08
•
Expires: 1994-01-10
Abstract
Abstract A circuit arrangement which provides for combined regenerative and resistive breaking operation in a D-C series machine which is operated as a generator in which a D-C control element having a main controlled rectifier and associated quenching capacitor are connected in parallel with the motor and wherein there is provided a return diode, a braking resistor and a controlled braking rectifier. In addition, an overflow diode is provided to bypass the return diode and field winding of the machine. The requirement for a separate extinguishing circuit for the breaking rectifier is avoided by providing an auxiliary rectifier which is fired at the same time as the main controlled rectifier and provides therethrough an extinguishing current from the quenching capacitor of the main controlled rectifier to extinguish the controlled braking rectifier.
Inventors
- 👤 Wolfgang Meissen
- 👤 Rudolf Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:34
CPC Classifications
B; B60; B60L; B60L7/00; B60L7/003; B60L7/22; B60L9/00; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
A circuit arrangement for the mixed regenerative and resistance braking operation of a D-C series machine which includes an armature and a field winding in series operated as a generator comprising: a. a D-C control element including a controlled main rectifier and a quenching circuit with a quenching capacitor therein, said element in parallel with said series machine; b. an uncontrolled return rectifier coupling the series machine to a D-C source which can absorb the current generated at least some of the time; c. a braking branch including at least a braking resistor in series with a controlled braking rectifier coupled in parallel with said series machine through said uncontrolled return rectifier; d. an uncontrolled overflow rectifier having a polarity in the current flow direction of the D-C series machine operating as a generator, coupling the junction of the armature and field winding to the overhead system; and wherein the improvement comprises: e. a controlled auxiliary rectifier coupling the quenching capacitor and main rectifier of the D-C control element to said controlled braking rectifier, to form a quenching circuit therefor.
Claim 2
Dependent Claim
180 words
A circuit arrangement for the mixed regenerative and resistance braking operation of a D-C series machine which includes an armature and a field winding in series operated as a generator comprising: a. a D-C control element including a controlled main rectifier and a quenching circuit with a quenching capacitor therein, said element in parallel with said series machine; b. an uncontrolled return rectifier coupling the series machine to a D-C source which can absorb the current generated at least some of the time; c. a braking branch including at least a braking resistor in series with a controlled braking rectifier coupled in parallel with said series machine through said uncontrolled return rectifier; d. an uncontrolled overflow rectifier having a polarity in the current flow direction of the D-C series machine operating as a generator, coupling the junction of the armature and field winding to the overhead system; and wherein the improvement comprises: e. a controlled auxiliary rectifier coupling the quenching capacitor and main rectifier of the D-C control element to said controlled braking rectifier, to form a quenching circuit therefor.
Claim 3
Dependent Claim
35 words
The invention according to claim 1 wherein said auxiliary rectifier is placed between the junction of said braking resistor and said braking rectifier and one electrode of the quenching capacitor of the D-C control element.
Claim 4
Dependent Claim
17 words
The invention according to claim 1 wherein said auxiliary rectifier has in series therewith a limiting choke.
Claim 5
Dependent Claim
17 words
The invention according to claim 2 wherein said auxiliary rectifier has in series therewith a limiting choke.
Claim 6
Dependent Claim
35 words
The invention according to claim 3 wherein said D-C control element includes a reversing choke in its quenching circuit and wherein at least a portion of said reversing choke is used as said limiting choke.
Claim 7
Dependent Claim
34 words
The invention according to claim 4 wherein said D-C control element includes a reversing choke in its quenching circuit wherein at least a portion of said reversing choke is used as said limiting choke.
Claim 8
Dependent Claim
48 words
The invention according to claim 5 wherein said reversing choke of said D-C control element is divided into two partial reversing chokes and said auxiliary rectifier is coupled between the junction of said braking resistor and said braking rectifier and the junction of said two partial reversing chokes.
Claim 9
Dependent Claim
48 words
The invention according to claim 6 wherein said reversing choke of said D-C control element is divided into two partial reversing chokes and said auxiliary rectifier is coupled between the junction of said braking resistor and said braking rectifier and the junction of said two partial reversing chokes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |