US3729664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sink mounting for the power semiconductor in a solid state d.c. motor control circuit
Assignee: Schneider Electric USA Inc
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Filing: 1971-10-06
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Granted: 1973-04-24
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Expires: 1991-10-06
Abstract
Abstract A control circuit for a battery powered vehicle. The circuit includes a pair of silicon controlled rectifiers which are connected between the battery and the motor and commutated to cause the motor to be energized with pulses of current, a diode which conducts currents induced in the motor by the current pulses, a diode which conducts currents generated by the motor when the direction of current flow through the field of the motor is reversed and the motor acts as a generator and a diode which is connected in a charging circuit for a capacitor which causes the rectifiers to commutate and a heat sink which provides a common mounting and electrical junction for the pair of rectifiers and the three diodes.
Inventors
- 👤 R Montross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:21
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
144 words
A circuit for controlling the energization of an armature and a field of a direct current motor from a direct current source comprising: means including a pair of silicon controlled rectifiers with each rectifier having a pair of main electrodes connected in a circuit between the source and the motor for causing the source to supply the motor with spaced pulses of energizing current, means including a first diode having a pair of electrodes connected across the field and the armature for conducting currents induced in the armature during intervals between said pulses, and a metal heat sink providing a common mounting for the pair of rectifiers and the diode and providing a common electrical junction for an input terminal of the motor and a first main electrode of each of the rectifiers and a first of the pair of electrodes of the diode.
Claim 2
Dependent Claim
144 words
A circuit for controlling the energization of an armature and a field of a direct current motor from a direct current source comprising: means including a pair of silicon controlled rectifiers with each rectifier having a pair of main electrodes connected in a circuit between the source and the motor for causing the source to supply the motor with spaced pulses of energizing current, means including a first diode having a pair of electrodes connected across the field and the armature for conducting currents induced in the armature during intervals between said pulses, and a metal heat sink providing a common mounting for the pair of rectifiers and the diode and providing a common electrical junction for an input terminal of the motor and a first main electrode of each of the rectifiers and a first of the pair of electrodes of the diode.
Claim 3
Dependent Claim
93 words
The circuit as recited in claim 1 including means connected in the circuit between the source and the motor for selectively causing the armature to rotate in either of two directions when the motor is energized by the current pulses and a means including a second diode mounted on the heat sink, said second diode having a pair of main electrodes connected across the motor armature for conducting currents generated by the motor when the direction of rotation is reversed and having one of its main electrodes electrically connected to the heat sink.
Claim 4
Dependent Claim
28 words
The circuit as recited in claim 2 wherein the said one main electrodes are the anode electrodes of the respective rectifiers and the first and the second diodes.
Claim 5
Dependent Claim
46 words
The circuit as recited in claim 3 wherein the means for causing the source to supply the motor with pulses of energizing current includes a third diode that is mounted on the heat sink, said third diode having a main electrode connected to the heat sink.
Claim 6
Dependent Claim
22 words
The circuit as recited in claim 4 wherein the main electrode of the third diode is the cathode of the third diode.
Claim 7
Dependent Claim
50 words
The cirCuit as recited in claim 1 wherein each silicon controlled rectifier has a second main electrode and the means for causing the source to supply the motor with pulses of energizing current includes a capacitor that is connected between the second electrodes of the pair of silicon controlled rectifiers.
Claim 8
Dependent Claim
50 words
The circuit as recited in claim 5 wherein each silicon controlled rectifier has a second main electrode and the means for causing the source to supply the motor with pulses of energizing current includes a capacitor that is connected between the second electrodes of the pair of silicon controlled rectifiers.
Claim 9
Dependent Claim
50 words
The circuit as recited in claim 7 including a transformer, said transformer having a primary winding connected in the circuit between the source and the motor and a secondary winding connected in a circuit including the third diode, the heat sink, one of said pair of rectifiers and the capacitor.
Claim 10
Dependent Claim
17 words
The circuit as recited in claim 1 wherein the motor is a series wound direct current motor.
Claim 11
Dependent Claim
21 words
The circuit as recited in claim 9 wherein the armature has one of its input terminals connected to the heat sink.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |