US4282568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric power converting apparatus
Assignee: Toshiba Corp
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Filing: 1980-04-18
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Granted: 1981-08-04
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Expires: 2000-04-18
Abstract
Abstract In an electric power converting apparatus comprising a plurality of branches each including a plurality of serially connected semiconductor switching elements, a non-linear resistor is connected in parallel with each semiconductor switching element, and a voltage division element including serially connected capacitor and a resistor is connected in parallel with each semiconductor switching element. A reactor is connected in series with each one of the branches and an arrestor is connected in parallel with a serially connected reactor and an associated branch.
Inventors
- 👤 Sumio Kobayashi
- 👤 Tetsushi Matsushita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:16
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/08; H03K17/081; H03K17/0814; H03K17/08144; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/1203; H02H7/1206; H02M; H02M7/00; H02M7/66; H02M7/68; H02M7/72; H02M7/75; H02M7/757; H02M7/7575; Y; Y02; Y02E; Y02E60/00; Y02E60/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
An electric power converting apparatus comprising: a plurality of parallelly connected branches, a plurality of linear reactors each connected in series with one of said branches, and a plurality of arrestors each connected in parallel with a series connection of a linear reactor and a branch, each branch including a plurality of serially connected semiconductor switching elements, a plurality of non-linear resistors each connected in parallel with one or more of said semiconductor switching elements, a voltage division element including a serially connected capacitor and resistor connected in parallel with each semiconductor switching element and anode reactors connected in series with said semiconductor switching elements, each of the non-linear resistors of a branch providing a limiting voltage, and the sum of the limiting voltages being lower than the protective level of an arrestor connected in parallel with a serially connected linear reactor and a branch.
Claim 2
Dependent Claim
145 words
An electric power converting apparatus comprising: a plurality of parallelly connected branches, a plurality of linear reactors each connected in series with one of said branches, and a plurality of arrestors each connected in parallel with a series connection of a linear reactor and a branch, each branch including a plurality of serially connected semiconductor switching elements, a plurality of non-linear resistors each connected in parallel with one or more of said semiconductor switching elements, a voltage division element including a serially connected capacitor and resistor connected in parallel with each semiconductor switching element and anode reactors connected in series with said semiconductor switching elements, each of the non-linear resistors of a branch providing a limiting voltage, and the sum of the limiting voltages being lower than the protective level of an arrestor connected in parallel with a serially connected linear reactor and a branch.
Claim 3
Dependent Claim
30 words
The electric power converting apparatus according to claim 1 wherein the sum of the limiting voltages provided by the non-linear resistors is lower than the protective level of said arrestor.
Claim 4
Dependent Claim
33 words
The electric power converting apparatus according to claim 1 wherein the resistance of the voltage division element is varied in accordance with the polarity of the overvoltage impressed across the semiconductor switching element.
Claim 5
Dependent Claim
22 words
The electric power converting apparatus according to claim 1 wherein said non-linear resistor is connected in parallel with each semiconductor switching element.
Claim 6
Dependent Claim
34 words
The electric power converting apparatus according to claim 1 wherein said serially connected semiconductor switching elements are divided into a plurality of groups and said non-linear resistor is connected in parallel with each group.
Claim 7
Dependent Claim
31 words
The electric power converting apparatus according to claim 1 wherein said serially connected semiconductor switching elements are divided into a plurality of groups, and anode reactors are interposed between adjacent groups.
Claim 8
Dependent Claim
36 words
The electric power converting apparatus according to claim 1 wherein the value of said resistor of the voltage division element is selected according to the polarity of surge voltage impressed upon said electric power converting apparatus.
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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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |