Patent US3597638A successfully refreshed from Google Patents.
US3597638A
Expired / Lapsed
US
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Multiphase waveform generator
Assignee: PANFOSS
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Filing: 1968-08-26
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Granted: 1971-08-03
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Expires: 1988-08-26
Abstract
Abstract An electrical three-phase generator and motor control circuit. The generator is made of three alike wave-generating units in cascade each generating a respective trapezoidal wave corresponding to a respective phase of the generator. Each unit comprises a small detector in series with a control circuit varying the amplitude of the wave proportionately to a control voltage representative of and corresponding to variations of voltage from voltage sources and applied to a motor and an integrating circuit consisting of an integrating amplifier and an integrating capacitor and a double limiter in parallel therewith. The control voltage is developed by a voltage divider across the motor control circuit.
Inventors
- 👤 Arne Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:59
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/15; H03K5/15013; H03K5/15026; H03K5/1504; H02; H02M; H02M1/00; H02M1/08; H03K4/00; H03K4/94; H03K5/153
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A wave-generator comprising, means to generate a trapezoidal wave comprising solely stationary components, said means to generate a wave comprising a null detector, a control circuit connected in series with said null detector and having means for receiving a control signal varying one of the parameters of halfwaves of said wave, an integrating circuit connected to receive the output of said control circuit, and means to take out the output of the integrating circuit as said wave.
Claim 2
Dependent Claim
77 words
A wave-generator comprising, means to generate a trapezoidal wave comprising solely stationary components, said means to generate a wave comprising a null detector, a control circuit connected in series with said null detector and having means for receiving a control signal varying one of the parameters of halfwaves of said wave, an integrating circuit connected to receive the output of said control circuit, and means to take out the output of the integrating circuit as said wave.
Claim 3
Dependent Claim
32 words
A wave generator according to claim 1, in which said control circuit comprises means to vary the amplitude of the wave generated thereby in dependence upon the value of said control signal.
Claim 4
Dependent Claim
33 words
A wave generator according to claim 2, in which said integrating circuit comprises an integrating amplifier, an integrating capacitor in parallel with said amplifier, and a double limiter in parallel with said capacitor.
Claim 5
Dependent Claim
16 words
A wave generator according to claim 2, in which said control circuit comprises a double limiter.
Claim 6
Dependent Claim
76 words
A wave generator according to claim 4, in which said null detector comprises two series transistors, one of said transistors having an output collector, said amplifier comprising an input transistor having a base and an output transistor, two resistors connecting said output collector to said base of said input transistor, two parallel diodes connected in opposite polarity at junctions between said resistors, said double limiter comprising two zener diodes connected back to back across said amplifier.
Claim 7
Dependent Claim
122 words
An electrical multiphase generator with stationary components comprising: a plurality of alike wave-generating units connected in cascade and equal in number to the number of phases of the multiphase generator, each unit comprising stationary means to generate a wave having plus and minus half-waves, each half-wave having a trapezoidal waveform, said means to generate a wave each comprising, a null detector, a control circuit connected in series with said null detector and having means receptive of a control signal varying half-waves and an integrating circuit connected to receive the output of said control circuit, and means for each of said wave-generating units connected thereto to take out the wave output from each wave generating unit as an output of the integrating circuit,
Claim 8
Dependent Claim
122 words
An electrical multiphase generator with stationary components comprising: a plurality of alike wave-generating units connected in cascade and equal in number to the number of phases of the multiphase generator, each unit comprising stationary means to generate a wave having plus and minus half-waves, each half-wave having a trapezoidal waveform, said means to generate a wave each comprising, a null detector, a control circuit connected in series with said null detector and having means receptive of a control signal varying half-waves and an integrating circuit connected to receive the output of said control circuit, and means for each of said wave-generating units connected thereto to take out the wave output from each wave generating unit as an output of the integrating circuit,
Claim 9
Dependent Claim
41 words
An electrical multiphase generator with stationary components according to claim 6, in which said control circuit of each of said units comprises means to vary the amplitude of the wave generated thereby in dependence upon the value of said control signal.
Claim 10
Dependent Claim
37 words
An electrical multiphase generator with stationary components according to claim 7, in which said integrating circuit comprises an integrating amplifier, an integrating capacitor in parallel with said amplifier, and a double limiter in parallel with said capacitor.
Claim 11
Dependent Claim
20 words
An electrical multiphase generator with stationary components according to claim 7, in which said control circuit comprises a double limiter.
Claim 12
Dependent Claim
80 words
An electrical multiphase generator with stationary components according to claim 9, in which said null detector comprises two series transistors, one of said transistors having an output collector, said ampliFier comprising an input transistor having a base and an output transistor, two resistors connecting said output collector to said base of said input transistor, two parallel diodes connected in opposite polarity at junctions between said resistors, said double limiter comprising two zener diodes connected back to back across said amplifier.
Claim 13
Dependent Claim
31 words
An electrical multiphase generator with stationary components according to claim 6, in which said wave generating units comprise three units each generating a wave corresponding to a phase of said generator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |