Patent US4084205A successfully refreshed from Google Patents.
US4084205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase monitoring arrangement for a three phase network supplying a d.c. motor through a controlled converter
Assignee: Siemens AG
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Filing: 1976-09-28
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Granted: 1978-04-11
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Expires: 1996-09-28
Abstract
Abstract In a phase monitoring arrangement for a three phase network which supplies a controlled d.c. motor through a controlled converter, a power line dependent discriminator along with R-C circuits forms a smoothed, rectified monitoring voltage which depends on the phase sequence and is sensitive thereto and to phase failure along with a supplementary monitoring voltage dependent only on phase failure, the rectified monitoring voltage and supplementary monitoring voltage being supplied to an evaluating circuit comprising differential comparing amplifiers at which the monitoring voltages are compared with constant reference voltages independent of faults and the output thereof used to control switching means and a current regulator so that in the event of incorrect phase sequence or of a phase failure, the switching means feed a blocking signal which suppresses firing pulses to the controlled converter and the current regulator feeds a control signal to control the converter to its operating limit.
Inventors
- 👤 Ulrich Bohnert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:22
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/08; H02H7/09; H02H11/00; H02H11/004; H02H3/00; H02H3/24; H02H3/253; H02H7/003; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/145; H02M7/155; H02M7/162; H02M7/1623
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
219 words
A phase monitoring arrangement for a three phase network supplying a controllable d.c. motor through a controlled converter having a three phase bridge circuit with a rectifier bridge supplying the field circuit of the motor, said controlled converter having a control circuit generating firing pulses therefor which receives a control input from a regulator circuit, with the regulator circuit, firing pulse control circuit and converter supplied with d.c. current from a power supply coupled to the line through a power line transformer, comprising: (a) a discriminator coupled to the power line transformer for providing a smoothed monitoring voltage which is dependent on phase sequence and phase failures and a rectified and smoothed supplementary monitoring voltage which depends only on phase failures; (b) an evaluating circuit having as inputs said monitoring and supplementary monitoring voltage and a constant reference voltage, said evaluating circuit providing first and second output signals if either said monitoring voltage or said supplementary monitoring voltage differ from said constant reference voltage by a predetermined amount; (c) means coupling said first output signal as a blocking input to said firing pulse control circuit; and (d) means coupling said second output signal as a control input to said regulator circuit to cause said regulator circuit to control said firing control circuit to the control limit of the converter.
Claim 2
Dependent Claim
219 words
A phase monitoring arrangement for a three phase network supplying a controllable d.c. motor through a controlled converter having a three phase bridge circuit with a rectifier bridge supplying the field circuit of the motor, said controlled converter having a control circuit generating firing pulses therefor which receives a control input from a regulator circuit, with the regulator circuit, firing pulse control circuit and converter supplied with d.c. current from a power supply coupled to the line through a power line transformer, comprising: (a) a discriminator coupled to the power line transformer for providing a smoothed monitoring voltage which is dependent on phase sequence and phase failures and a rectified and smoothed supplementary monitoring voltage which depends only on phase failures; (b) an evaluating circuit having as inputs said monitoring and supplementary monitoring voltage and a constant reference voltage, said evaluating circuit providing first and second output signals if either said monitoring voltage or said supplementary monitoring voltage differ from said constant reference voltage by a predetermined amount; (c) means coupling said first output signal as a blocking input to said firing pulse control circuit; and (d) means coupling said second output signal as a control input to said regulator circuit to cause said regulator circuit to control said firing control circuit to the control limit of the converter.
Claim 3
Dependent Claim
96 words
Apparatus according to claim 1 wherein said evaluating circuit includes first comparator means and second comaparator means for respectively comparing said monitoring voltage and supplementary monitoring voltage with said reference voltage, said first and second comparator means providing an output voltage of a first polarity in the absence of a failure and an output voltage of opposite polarity in the case of a failure, and switching means controlled by the outputs of said comparator means for providing said first signal and means coupled to the output of said two comparator means for providing said second signal.
Claim 4
Dependent Claim
18 words
Apparatus according to claim 2 and further including indicator means coupled to the outputs of said comparator means.
Claim 5
Dependent Claim
32 words
Apparatus according to claim 2 wherein said indicator means comprises switching means having as inputs the outputs of said comparator means and a relay coupled to the output of said switching means.
Claim 6
Dependent Claim
46 words
Apparatus according to claim 4 wherein said switching means comprise first and second switching transistors having their collector-emitter circuits coupled in parallel and in series with said relay, the outputs of said comparator means being coupled respectively to the bases of said first and second transistors.
Claim 7
Dependent Claim
146 words
Apparatus according to claim 1 wherein said discriminator comprises: (a) a secondary winding of said transformer having two phase windings V connected; (b) first and second equal R-C members coupled in series the junction point between said two R-C members coupled to the common point of said V connection and the two ends of said series connection of said two R-C members coupled to the ends of said two windings; (c) a first rectifier bridge having its input coupled to the series circuit of said R-C members; (d) a third secondary winding of said transformer; (e) a second rectifier bridge having its input coupled to said third phase winding; and (f) first and second storage capacitors coupled respectively across the outputs of said first and second rectifier bridges, whereby said first rectifier bridge supplies said monitoring voltage and said second recifier bridge said supplementary monitoring voltage.
Claim 8
Dependent Claim
164 words
Apparatus according to claim 6 wherein said evaluating circuit comprises: (a) first and second comparing differential amplifiers; (b) means for supplying a constant reference voltage which is free of disturbances as a reference input to each of said amplifiers, the first of said amplifiers having coupled as a second input said monitoring voltage and the second having as a second input said supplementary monitoring voltage; (c) first and second switching transistors having their emitter-collector paths coupled in parallel, the bases of said first and second transistors being coupled respectively to the outputs of said first and second amplifiers, said paralleled switching transistors supplying said first output signal; (d) first and second diodes each having one terminal coupled respectively to the output of said first and second amplifiers and a second terminal connected together supplying said second output signal, and wherein said means coupling said second output signal to said regulator circuit comprises a resistor coupling said common terminal of said diodes to said regulator.
Claim 9
Dependent Claim
50 words
Apparatus according to claim 7 wherein said indicator means comprise: a relay, third and fourth switching transistors having their collector-emitter circuits coupled in parallel and in series with said relay, the bases of said third and fourth transistors coupled respectively to the outputs of said first and second differential amplifiers.
Claim 10
Dependent Claim
164 words
Apparatus according to claim 1 wherein said evaluating circuit comprises: (a) first and second comparing differential amplifiers; (b) means for supplying a constant reference voltage which is free of disturbances as a reference input to each of said amplifiers, the first of said amplifiers having coupled as a second input said monitoring voltage and the second having as a second input said supplementary monitoring voltage; (c) first and second switching transistors having their emitter-collector paths coupled in parallel, the bases of said first and second transistors being coupled respectively to the outputs of said first and second amplifiers, said paralleled switching transistors supplying said first output signal; (d) first and second diodes each having one terminal coupled respectively to the output of said first and second amplifiers and a second terminal connected together supplying said second output signal, and wherein said means coupling said second output signal to said regulator circuit comprises a resistor coupling said common terminal of said diodes to said regulator.
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) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |