Patent US3916271A successfully refreshed from Google Patents.
US3916271A
Expired / Lapsed
US
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Electric vibration type compressor
Assignee: Sawafuji Electric Co Ltd
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Filing: 1974-10-03
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Granted: 1975-10-28
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Expires: 1994-10-03
Abstract
Abstract An electric vibration type compressor comprising a mechanical vibration system having a drive coil and at least one spring which is resonant with the motion of the drive coil, and an electric vibration system having at least one switching element which performs switching control with variable factors in the electric vibration system varying in relation to the vibration of the drive coil, the switching control being conducted under the condition that
Inventors
- 👤 Ryoichi Watanabe
- 👤 Yukio Okuda
- 👤 Hiroyuki Kainuma
- 👤 Kenzi Hayashi
- 👤 Toshio Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:30
CPC Classifications
H; H02; H02K; H02K33/00; H02K33/18
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
191 words
An electric vibration type compressor comprising, a mechanical vibration system having a drive coil and at least one spring resonating with the vibration of the drive coil, and an electric vibration system having at least one switching element which switches when: IC > OR = hFE.IB wherein IC: the output current of the switching element IB: the control current of the switching element hFE: the current amplification factor of the switching element, said electric vibration system being connected to said drive coil to perform switching control in accordance with the variation in resistance of said drive coil in relation to the vibration of the drive coil, said electric vibration system further comprising control means for controlling the waveform of the current IB and IC which are fed to the switching element to a first value during the initial starting period and to a second value during subsequent operation such that the time measured from when the switching element is turned on till the switching element is turned off is substantially the same for both the initial starting period as well as for the steady operation of the electric vibration type compressor.
Claim 2
Dependent Claim
191 words
An electric vibration type compressor comprising, a mechanical vibration system having a drive coil and at least one spring resonating with the vibration of the drive coil, and an electric vibration system having at least one switching element which switches when: IC > OR = hFE.IB wherein IC: the output current of the switching element IB: the control current of the switching element hFE: the current amplification factor of the switching element, said electric vibration system being connected to said drive coil to perform switching control in accordance with the variation in resistance of said drive coil in relation to the vibration of the drive coil, said electric vibration system further comprising control means for controlling the waveform of the current IB and IC which are fed to the switching element to a first value during the initial starting period and to a second value during subsequent operation such that the time measured from when the switching element is turned on till the switching element is turned off is substantially the same for both the initial starting period as well as for the steady operation of the electric vibration type compressor.
Claim 3
Dependent Claim
33 words
The electric vibration type compressor as in claim 1 and wherein said control means increases the current IB during a predetermned period after the switching element has been switched to its on state.
Claim 4
Dependent Claim
68 words
The electric vibration type compressor as in claim 2 and wherein said electric vibration system further comprises a DC voltage source, and wherein said control means applies said DC voltage to the input terminal of the switching element at the moment when the switching element is turned to its on state, and then cancels the effect of the application of the DC voltage aT a predetermined time thereafter.
Claim 5
Dependent Claim
31 words
The electric vibration type compressor as in claim 3 and wherein said control means maintains the applied DC voltage at a constant level after its rise at the moment of switching.
Claim 6
Dependent Claim
41 words
The electric vibration type compressor as in claim 3 wherein said control means includes by pass means for cancelling the effect of the application of the DC voltage by by passing the current supplied by the application of the DC voltage.
Claim 7
Dependent Claim
62 words
The electric vibration type compressor as in claim 3 wherein said control means includes feedback means for supplying an input terminal of the switching element with a feedback current produced by the switching-on of the switching element at the moment of switching-on, and wherein the current which is supplied by the application of said DC voltage is superimposed on said feedback current.
Claim 8
Dependent Claim
37 words
The electric vibration type compressor as in claim 6 wherein said control means includes by pass means for bypassing the current supplied by the application of the said DC voltage after the lapse of a predetermined time.
Claim 9
Dependent Claim
46 words
The electric vibration type compressor as in claim 2 and wherein said control means further comprises discharge means for discharging into the input terminal of the switching element a previously accumulated electric charge at the moment when the switching element is turned to its on state.
Claim 10
Dependent Claim
57 words
The electric vibration type compressor as in claim 8 wherein said control means includes feedback means for feeding the input terminal of the switching element a feedback current produced by switching-on of the switching element at the moment of switching-on, and wherein the discharge current of said previously accumulated electric charge is superimposed on said feedback current.
Claim 11
Dependent Claim
37 words
The electric vibration type compressor as in claim 8 and wherein said previously accumulated electric charge is built up during the period when the switching element which is to be turned on remains in the off state.
Claim 12
Dependent Claim
37 words
The electric vibration type compressor as in claim 9 and wherein said previously accumulated electric charge is built up during the period when the switching element which is to be turned on remains in the off state.
Claim 13
Dependent Claim
111 words
The electric vibration type compressor as in claim 11 wherein said electric vibration system includes an output circuit in which said drive coil acts as a load, and wherein said discharge means includes a capacitor and a diode connected in series circuit, said series circuit being connected in parallel with said output circuit, such that said capacitor is charged when voltage is applied to the output circuit in a forward direction with respect to the diode, and when a voltage is applied to the output circuit in a reverse direction with respect to said diode, said capacitor is discharged into the input terminal of the switching element to turn it on.
Claim 14
Dependent Claim
86 words
The electric vibration type compressor as in claim 8 wherein said electric vibration system includes an input circuit coupled to the switching element, and wherein said discharge means includes a capacitor inserted in said input circuit, said capacitor being charged with a feedback current from the point of time when the switching element is turned off, said feedback current being superimposed on the input circuit, and said capacitor being charged to the opposite polarity from the point of time when the switching element is turned on.
Claim 15
Dependent Claim
106 words
The electric vibration type compressor as in claim 8 wherein said electric vibration system includes at least two alternately controlled switching elements, each of which has its own input circuit, and wherein said discharge means includes a capacitor inserted in the input circuit of either of the switching elements, said capacitor being charged by a feedback current supplied from the moment when one switching element is turned to the on state, and supplies a superimposed feedback current to the input circuit of the other switching element by discharging the charge built up by the capacItor at the moment when said one switching element is turned off.
Claim 16
Dependent Claim
27 words
The electric vibration type compressor as in claim 14 and wherein said electric vibration system further comprises a transformer which connects said input circuits to each other.
Claim 17
Dependent Claim
37 words
The electric vibration type compressor as in claim 14 wherein each of said input circuits includes a capacitor and each of said capacitors are respectively connected in series with the input terminals of their respective switching elements.
Claim 18
Dependent Claim
21 words
The electric vibration type compressor as in claim 15 and further comprising diodes connected in parallel with each of said capacitors.
Claim 19
Dependent Claim
72 words
The electric vibration type compressor as in claim 2 and wherein said electric vibration system includes an output circuit in which said drive coil acts as a load, and wherein said control means includes a differentiation circuit for differentiating the load current supplied to the output circuit and supplies that current to the input terminal of the switching element at the moment when the switching element is turned to the on state.
Claim 20
Dependent Claim
52 words
The electric vibration type compressor as in claim 18 wherein said control means includes feedback means for feeding the input terminal of the switching element with a feedback current produced by switching-on of the switching element at the moment of switching-on, and wherein the differentiated current is superimposed on said feedback current.
Claim 21
Dependent Claim
37 words
The electric vibration type compressor as in claim 18 and further comprising a current transformer connected in series with the output circuit and wherein the differentiated current is obtained from the secondary winding of said current transformer.
Claim 22
Dependent Claim
37 words
The electric vibration type compressor as in claim 19 and further comprising a current transformer connected in series with the output circuit and wherein the differentiated current is obtained from the secondary winding of said current transformer.
Claim 23
Dependent Claim
60 words
The electric vibration type compressor as in claim 20 wherein the electric vibration system includes at least two alternately controlled switching elements each of which has its own input circuit, and further comprising a transformer connecting together said two input circuits, and wherein said secondary winding of said current transformer is connected only to one side of said input circuits.
Claim 24
Dependent Claim
60 words
The electric vibration type compressor as in claim 21 wherein the electric vibration system includes at least two alternately controlled switching elements each of which has its own input circuit, and further comprising a transformer connecting together said two input circuits, and wherein said secondary winding of said current transformer is connected only to one side of said input circuits.
Claim 25
Dependent Claim
38 words
The electric vibration type compressor as in claim 1 wherein said control means decreases the current IB at a predetermined time after the switching element is turned on, by setting the current IB to a sufficiently large value.
Claim 26
Dependent Claim
81 words
The electric vibration type compressor as in claim 24 wherein said electric vibration system includes an output circuit in which said drive coil acts as a load, an input circuit coupled to said switching element, a transformer having its primary winding connected in parallel with said output circuit and its secondary winding connected in the input circuit, whereby a voltage induced across the secondary winding of the transformer is decreased at a predetermined time after the switching element is turned on.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |