US3753075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inverter
Assignee: Hitachi Ltd
•
Filing: 1972-07-03
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Granted: 1973-08-14
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Expires: 1992-07-03
Abstract
Abstract An inverter for transforming a d.c. current to an a.c. current comprising, a switching transistor and an output transformer having a primary winding connected to the collector of the transistor, a current transformer having a primary winding connected to the primary winding of the output transformer and a secondary winding connected to the base of the switching transistor, a coupling capacitor inserted between said base of the transistor and the secondary winding of the current transformer, a capacitor parallelly connected to the primary winding of the output transformer, the primary windings of the output and current transformers and said capacitor forming a resonance circuit to control the oscillation.
Inventors
- 👤 T Tomura
- 👤 H Iyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:55
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
150 words
An inverter comprising: an amplifying element used as a switching element and having an input terminal to be connected to a d.c. source; an output transformer connected to an output terminal of said amplifying element; a current transformer having a primary winding and a secondary winding electromagnetically coupled thereto, for positively feeding back the current flowing through the output transformer to the control terminal of said amplifying element; a coupling capacitance connected between the secondary winding of said current transformer and the control terminal of said amplifying element; a resonance circuit including said primary winding of the current transformer, the output transformer and a capacitance connected parallelly thereto; and bias supply means connected between said resonance circuit and the control terminal of said amplifying element; said resonance circuit controlling the oscillation of the circuit and said d.c. current being transformed into a a.c. current and derived through said output transformer.
Claim 2
Dependent Claim
150 words
An inverter comprising: an amplifying element used as a switching element and having an input terminal to be connected to a d.c. source; an output transformer connected to an output terminal of said amplifying element; a current transformer having a primary winding and a secondary winding electromagnetically coupled thereto, for positively feeding back the current flowing through the output transformer to the control terminal of said amplifying element; a coupling capacitance connected between the secondary winding of said current transformer and the control terminal of said amplifying element; a resonance circuit including said primary winding of the current transformer, the output transformer and a capacitance connected parallelly thereto; and bias supply means connected between said resonance circuit and the control terminal of said amplifying element; said resonance circuit controlling the oscillation of the circuit and said d.c. current being transformed into a a.c. current and derived through said output transformer.
Claim 3
Dependent Claim
49 words
An inverter according to claim 1, further comprising a non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element.
Claim 4
Dependent Claim
82 words
An inverter according to claim 1, further comprising a first non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element, and a second non-linear element parallelly connected to said coupling capacitor so that the terminal voltage of said coupling capacitance is maintained substantially constant in the ''''off'''' period of said amplifying element.
Claim 5
Dependent Claim
37 words
An inverter according to claim 1, in which said current transformer is formed of a third winding inserted between said output transformer and the output terminals of said amplifying element, and electromagnetically coupled with said secondary winding.
Claim 6
Dependent Claim
49 words
An inverter according to claim 4, further comprising a non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element.
Claim 7
Dependent Claim
82 words
An inverter according to claim 4, further comprising a first non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element, and a second non-linear element parallelly connected to said coupling capacitor so that the terminal voltage of said coupling capacitance is maintained substantially constant in the ''''off'''' period of said amplifying element.
Claim 8
Dependent Claim
31 words
An inverter according to claim 1, in which the secondary winding of said output transformer is formed of a separate winding and said capacitance is parallelly connected to said secondary winding.
Claim 9
Dependent Claim
49 words
An inverter according to claim 7, further comprising a non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element.
Claim 10
Dependent Claim
82 words
An inverter according to claim 7, further comprising a first non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying Element, and a second non-linear element parallelly connected to said coupling capacitor so that the terminal voltage of said coupling capacitance is maintained substantially constant in the ''''off'''' period of said amplifying element.
Claim 11
Dependent Claim
33 words
An inverter according to claim 7, in which said current transformer consists of a third winding serially connected to the primary winding of said output transformer and electromagnetically coupled with said secondary winding.
Claim 12
Dependent Claim
49 words
An inverter according to claim 10, further comprising a non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element.
Claim 13
Dependent Claim
82 words
An inverter according to claim 10, Further comprising a first non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element, and a second non-linear element parallelly connected to said coupling capacitor so that the terminal voltage of said coupling capacitance is maintained substantially constant is the ''''off'''' period of said amplifying element.
Claim 14
Dependent Claim
82 words
An inverter according to claim 1, further comprising a first non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element, and a second non-linear element parallelly connected to said secondary winding so that the terminal voltage of said coupling capacitor is limited substantially constant in the ''''off'''' period of said amplifying element.
Claim 15
Dependent Claim
82 words
An inverter according to claim 4, further comprising a first non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element, and a second non-linear element parallelly connected to said secondary winding so that the terminal voltage of said coupling capacitor is limited substantially constant in the ''''off'''' period of said amplifying element.
Claim 16
Dependent Claim
82 words
An inverter according to claim 7, further comprising a first non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element, and a second non-linear element parallelly connected to said secondary winding so that the terminal voltage of said coupling capacitor is limited substantially constant in the ''''off'''' period of said amplifying element.
Claim 17
Dependent Claim
82 words
An inverter according to claim 10, further comprising a first non-linear element connected to the control terminal of said amplifying element so that the impedance between the terminals of the secondary winding of said current transformer increases only in the starting stage of the ''''off'''' state of said amplifying element, and a second non-linear element parallelly connected to said secondary winding so that the terminal voltage of said coupling capacitor is limited substantially constant in the ''''off'''' period of said amplifying element.
Claim 18
Dependent Claim
17 words
An inverter according to claim 5, in which said non-linear element has a series resistor connected thereto.
Claim 19
Dependent Claim
17 words
An inverter according to claim 8, in which said non-linear element has a series resistor connected thereto.
Claim 20
Dependent Claim
17 words
An inverter according to claim 11, in which said non-linear element has a seriss resistor connected thereto.
Claim 21
Dependent Claim
17 words
An inverter according to claim 9, in which said non-linear element has A series resistor connected thereto.
Claim 22
Dependent Claim
17 words
An inverter according to claim 12, in which said non-linear element has a series resistor connected thereto.
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |