Patent US4035703A successfully refreshed from Google Patents.
US4035703A
Expired / Lapsed
US
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Current circuit arrangement for reducing the switch-on power dissipation of a power transistor
Assignee: Maschinenfabrik Rieter AG
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Filing: 1975-12-11
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Granted: 1977-07-12
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Expires: 1995-12-11
Abstract
Abstract The current circuit arrangement is used to reduce the switch-on power dissipation of a power transistor which intermittently switches a direct-current voltage to an ohmic-inductive load and in which a voltage limiting diode is arranged parallel to the load. The current circuit arrangement employs a non-linear resistance member in series with the diode which resistance member includes at least one additional diode. In addition,a reactance member is used in parallel to the resistance member. Various one-phase and three-phase invertor stages may use the current arrangement.
Inventors
- 👤 Kurt Hablutzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:46
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H02M3/156; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/539; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/64; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/903
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
170 words
A current circuit arrangement for reducing the switch-on power dissipation of a power transistor which intermittently switches a direct current voltage to an ohmic-inductive load, said arrangement comprising a voltage limiting diode disposed in parallel to the load, said diode being biased in a blocking condition with said transistor in a conducting state and in a conducting condition with said transistor in a reverse-biased state; a non-linear resistance member connected in series with said voltage limiting diode, said member including at least one additional diode; and a low ohmic reactance member connected in parallel with said resistance member, said reactance member having a voltage time area sufficiently large to have the reactance limit the current after a repeated switch-on of said transistor until said voltage limiting diode takes up a reverse voltage and sufficiently small to have the voltage across said reactance member upon switching off said transistor diminish to a value lower than the forward voltage drop of said non-linear resistance member before said transistor is again switched on.
Claim 2
Dependent Claim
170 words
A current circuit arrangement for reducing the switch-on power dissipation of a power transistor which intermittently switches a direct current voltage to an ohmic-inductive load, said arrangement comprising a voltage limiting diode disposed in parallel to the load, said diode being biased in a blocking condition with said transistor in a conducting state and in a conducting condition with said transistor in a reverse-biased state; a non-linear resistance member connected in series with said voltage limiting diode, said member including at least one additional diode; and a low ohmic reactance member connected in parallel with said resistance member, said reactance member having a voltage time area sufficiently large to have the reactance limit the current after a repeated switch-on of said transistor until said voltage limiting diode takes up a reverse voltage and sufficiently small to have the voltage across said reactance member upon switching off said transistor diminish to a value lower than the forward voltage drop of said non-linear resistance member before said transistor is again switched on.
Claim 3
Dependent Claim
24 words
A current circuit arrangement as set forth in claim 1 wherein said non-linear resistance member further includes at least two diodes arranged in series.
Claim 4
Dependent Claim
25 words
A current circuit arrangement as set forth in claim 1 wherein said non-linear resistance member includes a diode and a zener diode arranged in series.
Claim 5
Dependent Claim
25 words
A current circuit arrangement as set forth in claim 1 wherein said non-linear resistance member includes a diode and a non-linear resistor arranged in series.
Claim 6
Dependent Claim
191 words
A transistor invertor circuit arrangement for switching an ohmic inductive load in an intermittent manner comprising a power transistor for switching the load on and off; a current circuit arrangement connected to said power transistor for reducing the switch-on dissipation of said power transistor, said current circuit arrangement including a voltage limiting diode disposed in parallel to the load, said diode being biased in a blocking condition with said transistor in a conducting state and in a conducting condition with said transistor in a reverse-biased state; a non-linear resistance member connected in series with said voltage limiting diode, said member including at least one additional diode; and a low ohmic reactance member connected in parallel with said resistance member, said reactance member having a voltage time area sufficiently large to have the reactance limit the current after a repeated switch-on of said transistor until said voltage limiting diode takes up a reverse voltage and sufficiently small to have the voltage across said reactance member upon switching off said transistor diminish to a value lower than the forward voltage drop of said non-linear resistance member before said transistor is again switched on.
Claim 7
Dependent Claim
191 words
A transistor invertor circuit arrangement for switching an ohmic inductive load in an intermittent manner comprising a power transistor for switching the load on and off; a current circuit arrangement connected to said power transistor for reducing the switch-on dissipation of said power transistor, said current circuit arrangement including a voltage limiting diode disposed in parallel to the load, said diode being biased in a blocking condition with said transistor in a conducting state and in a conducting condition with said transistor in a reverse-biased state; a non-linear resistance member connected in series with said voltage limiting diode, said member including at least one additional diode; and a low ohmic reactance member connected in parallel with said resistance member, said reactance member having a voltage time area sufficiently large to have the reactance limit the current after a repeated switch-on of said transistor until said voltage limiting diode takes up a reverse voltage and sufficiently small to have the voltage across said reactance member upon switching off said transistor diminish to a value lower than the forward voltage drop of said non-linear resistance member before said transistor is again switched on.
Claim 8
Dependent Claim
35 words
A transistor invertor circuit arrangement as set forth in claim 5 wherein said load is selected from the group consisting of a direct current motor, a relay coil, a switch coil, and a power magnet.
Claim 9
Dependent Claim
19 words
A transistor invertor circuit arrangement as set forth in claim 5 wherein said load is a direct current chopper.
Claim 10
Dependent Claim
18 words
A transistor invertor circuit arrangement as set forth in claim 5 wherein said load is a three-phase load.
Claim 11
Dependent Claim
19 words
A transistor invertor circuit arrangement as set forth in claim 8 wherein said three-phase load is an asynchronous motor.
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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |