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US4321663A
Expired / Lapsed
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Process of pulse duration modulation of a multi-phase converter
Assignee: CKD Praha Oborovy Podnik
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Filing: 1979-05-22
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Granted: 1982-03-23
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Expires: 1999-05-22
Abstract
Abstract A process of pulse duration modulation for improved voltage and frequency efficiency of a multi-phase converter. The sum of the time dependent voltage of a load phase and of an auxiliary time dependent voltage is formed, wherein the auxiliary time dependent voltage is the same for all converter phases. The pulse duration of the output voltage of each converter phase is modulated with said voltage sum.
Inventors
- 👤 Jan Krtek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:30
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/505; H02M7/515; H02M7/525; H02M7/527; H02M7/53; H02M7/537; H02M7/539; H02M7/5395; H02M1/00; H02M1/0048; H02M1/0054; Y; Y02; Y02B; Y02B70/00; Y02B70/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
A process of pulse duration modulation for improved voltage and frequency efficiency of a multi-phase converter, comprising the step of modulating the pulse duration of the output voltage of each converter phase with the sum of the desired time dependent voltage of the corresponding load phase and of an auxiliary time dependent voltage, wherein the auxiliary time dependent voltage is identical for all converter phases.
Claim 2
Dependent Claim
65 words
A process of pulse duration modulation for improved voltage and frequency efficiency of a multi-phase converter, comprising the step of modulating the pulse duration of the output voltage of each converter phase with the sum of the desired time dependent voltage of the corresponding load phase and of an auxiliary time dependent voltage, wherein the auxiliary time dependent voltage is identical for all converter phases.
Claim 3
Dependent Claim
72 words
A process of pulse duration modulation for improved voltage and frequency efficiency of a multi-phase converter as set forth in claim 1, wherein the auxiliary time dependent voltage is set as the negative one half of the sum of the maximum value for each moment of time of the voltages of the load phase and of the minimum value at each moment of time of the desired voltages of the load phase.
Claim 4
Dependent Claim
66 words
A process of pulse duration modulation for improved voltage and frequency efficiency of a multi-phase converter as set forth in claim 1, wherein the auxiliary time dependent voltage is set as the difference of the maximum attainable modulating voltage and the maximum of the absolute value of the desired voltage the load phase having the sign of the load voltage which has the largest absolute value.
Claim 5
Dependent Claim
73 words
A process of pulse modulation for improved voltage and frequency of a multi-phase converter as set forth in claim 1, wherein the auxiliary time dependent voltage is set as the difference of the maximum attainable modulating voltage and the intermediate absolute value of the voltages of the load phases having the same sign as an intermediate voltage of the load phase having the intermediate absolute value of the voltages of the load phase.
Claim 6
Dependent Claim
50 words
A process of pulse modulation for improved voltage and frequency efficiency of a multi-phase converter as set forth in claim 1, wherein the auxiliary time dependent voltage is set as the difference of the maximum attainable modulating voltage and of the maximum of the desired voltages of the load phases.
Claim 7
Dependent Claim
51 words
A process of pulse modulation for improved voltage and frequency efficiency of a multi-phase converter as set forth in claim 1, wherein the auxiliary time dependent voltage is set as the negative sum of the maximum attainable modulating voltage and of the minimum of the voltages of the several load phases.
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) | 1985-03-22 | 1985-09-21 | 1986-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-22 | 1989-09-21 | 1990-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-22 | 1993-09-21 | 1994-03-23 | $7700.00 | Window Closed / Lapsed |