US4010387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power transistor switching apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1975-04-14
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Granted: 1977-03-01
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Expires: 1995-04-14
Abstract
Abstract A power transistor switch is disclosed which includes a transistor having an emitter, a collector and a base for ON-OFF switching, the transistor being connected in series to a path connecting a power source and a load. Means are provided for controlling reapplied voltage which is reapplied between the emitter and the collector of the transistor during the transition period when the transistor is switched to the OFF state to suppress the reapplied voltage at the time the collector current is substantially broken.
Inventors
- 👤 Masahiko Akamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:43
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/08; H03K17/081; H03K17/0814; H03K17/08146
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A power transistor switch comprising: a transistor having an emitter, a collector and a base for ON-OFF switching, the transistor being connected in series to a path connecting a power source and a load, means for controlling reapplied voltage which is reapplied between the emitter and the collector of the transistor during the transition period when the transistor is switched to the OFF state to suppress the reapplied voltage at the time the collector current is substantially broken, said means comprising a resistor, a capacitor and a diode, means connecting the diode and the resistor in series between the emitter and the collector of the transistor, means connecting the capacitor between the power source and the junction of the resistor and the diode.
Claim 2
Dependent Claim
123 words
A power transistor switch comprising: a transistor having an emitter, a collector and a base for ON-OFF switching, the transistor being connected in series to a path connecting a power source and a load, means for controlling reapplied voltage which is reapplied between the emitter and the collector of the transistor during the transition period when the transistor is switched to the OFF state to suppress the reapplied voltage at the time the collector current is substantially broken, said means comprising a resistor, a capacitor and a diode, means connecting the diode and the resistor in series between the emitter and the collector of the transistor, means connecting the capacitor between the power source and the junction of the resistor and the diode.
Claim 3
Dependent Claim
115 words
A power transistor switch comprising: a transistor having an emitter, a collector and a base for ON-OFF switching, the transistor being connected in series to a path connecting a power source and a load, means for controlling reapplied voltage which is reapplied between the emitter and the collector of the transistor during the transition period when the transistor is switched to the OFF state to suppress the reapplied voltage at the time the collector current is substantially broken, said means comprising a resistor, a capacitor and a diode, means connecting the diode and the resistor in series between the emitter and the collector of each transistor, means connecting the capacitor in parallel with the resistor.
Claim 4
Dependent Claim
115 words
A power transistor switch comprising: a transistor having an emitter, a collector and a base for ON-OFF switching, the transistor being connected in series to a path connecting a power source and a load, means for controlling reapplied voltage which is reapplied between the emitter and the collector of the transistor during the transition period when the transistor is switched to the OFF state to suppress the reapplied voltage at the time the collector current is substantially broken, said means comprising a resistor, a capacitor and a diode, means connecting the diode and the resistor in series between the emitter and the collector of each transistor, means connecting the capacitor in parallel with the resistor.
Claim 5
Dependent Claim
143 words
A power transistor switch comprising: a transistor having an emitter, a collector and a base for ON-OFF switching, the transistor being connected in series to a path connecting a power source and a load, means for controlling reapplied voltage which is reapplied between the emitter and the collector of the transistor during the transition period when the transistor is switched to the OFF state to suppress the reapplied voltage at the time the collector current is substantially broken, said means comprising first and second diodes, a capacitor, an inductor and a thyristor, means connecting the first diode between the emitter and the collector of the transistor, means connecting the second diode, the capacitor and the inductor in series between the emitter and the collector of the transistor, means connecting the thyristor in parallel with the series connection of the capacitor and the inductor.
Claim 6
Dependent Claim
143 words
A power transistor switch comprising: a transistor having an emitter, a collector and a base for ON-OFF switching, the transistor being connected in series to a path connecting a power source and a load, means for controlling reapplied voltage which is reapplied between the emitter and the collector of the transistor during the transition period when the transistor is switched to the OFF state to suppress the reapplied voltage at the time the collector current is substantially broken, said means comprising first and second diodes, a capacitor, an inductor and a thyristor, means connecting the first diode between the emitter and the collector of the transistor, means connecting the second diode, the capacitor and the inductor in series between the emitter and the collector of the transistor, means connecting the thyristor in parallel with the series connection of the capacitor and the inductor.
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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |