US4891746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of optimizing the efficiency of a high frequency zero voltage switching resonant power inverter for extended line and load range
Assignee: Nokia Bell Labs
•
Filing: 1988-12-05
•
Granted: 1990-01-02
•
Expires: 2008-12-05
Abstract
Abstract A power inverter efficiency is optimized at high frequency in a fully resonant inverter operating with a range of load impedance that takes into consideration switching loss and conducting loss as a combined overall effect. Within this range of load impedance the inverter is constrained to operate with switching loss which is generally considered unacceptable in a conventional high frequency high efficiency power inverter, but the overall combined high efficiency of the disclosed power inverter has a wider range of load impedances than has been previously achieved in such a resonant power inverter. Non-linear capacitance across switching the device is positively utilized in achieving this goal.
Inventors
- 👤 Wayne C. Bowman
- 👤 William A. Nitz
- 👤 Norman G. Ziesse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:56
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A method of optimizing efficiency of a high frequency zero voltage switching resonant converter having a power switching device operating into an effective load comprising an inductive reactive component; comprising the steps of: utilizing a non-linear capacitance shunting the power switching device to reduce overall power dissipation by; determining a switching loss characteristic of the power switch; determining a conduction loss characteristic of the high frequency converter circuit including conduction loss in the power switch; determining a set of component values defining an operating point for the high frequency converter that minimizes a sum of combined losses related to switching loss conduction loss and switching the power switching device at a frequency to achieve a high overall operating efficiency for the converter.
Claim 2
Independent Claim
122 words
A method of optimizing efficiency of a high frequency zero voltage switching resonant converter having a power switching device operating into an effective load comprising an inductive reactive component; comprising the steps of: utilizing a non-linear capacitance shunting the power switching device to reduce overall power dissipation by; determining a switching loss characteristic of the power switch; determining a conduction loss characteristic of the high frequency converter circuit including conduction loss in the power switch; determining a set of component values defining an operating point for the high frequency converter that minimizes a sum of combined losses related to switching loss conduction loss and switching the power switching device at a frequency to achieve a high overall operating efficiency for the converter.
Claim 3
Dependent Claim
43 words
A method of optimizing efficiency of a high frequency zero voltage switching resonant converter as claimed in claim 1; further comprising the step of: utilizing a non-linear capacitance having a characteristic in which capacitance increases with decreasing voltage across the power switching device.
Claim 4
Dependent Claim
59 words
A method of optimizing efficiency of a high frequency zero voltage switching resonant converter as claimed in claim 2; further comprising the step of: operating an inverter portion of the high frequency converter into an effective reactive load whose resistive component exceeds the resistive component necessary for solely optimizing a reduction of switching loss of the power switching device.
Claim 5
Independent Claim
168 words
A method of enhancing overall efficiency of a high frequency fully resonant power converter in which a power switching device is operated into a series reactive load having an inductive impedance; comprising the steps of: utilizing a non linear capacitance with a capacitance characteristic in which capacitance increases as voltage decreases and which is connected in shunt with the power switch and is operative for shaping a voltage waveform across the power switch with a sharply defined peak region bounded by a gradual ascent and gradual descent in shape of the waveform and thereby broadening an impedance range into which the power switch can operate without incurring excessive switching losses; determining an overall loss profile curve for the power converter by combining switching loss and conduction loss characteristics for the power converter; and determining component values for the power converter that define an operating point of the power converter on the overall loss profile curve to minimize a sum of losses due to switching loss and conduction loss.
Claim 6
Independent Claim
168 words
A method of enhancing overall efficiency of a high frequency fully resonant power converter in which a power switching device is operated into a series reactive load having an inductive impedance; comprising the steps of: utilizing a non linear capacitance with a capacitance characteristic in which capacitance increases as voltage decreases and which is connected in shunt with the power switch and is operative for shaping a voltage waveform across the power switch with a sharply defined peak region bounded by a gradual ascent and gradual descent in shape of the waveform and thereby broadening an impedance range into which the power switch can operate without incurring excessive switching losses; determining an overall loss profile curve for the power converter by combining switching loss and conduction loss characteristics for the power converter; and determining component values for the power converter that define an operating point of the power converter on the overall loss profile curve to minimize a sum of losses due to switching loss and conduction loss.
Claim 7
Dependent Claim
99 words
A method of enhancing overall efficiency of a high frequency fully resonant power converter in which a power switching device is operated into a series reactive load having an inductive impedance, as claimed in claim 4; and further comprising the steps of: utilizing as the power switch a power MOSFET device with inherent non-linear shunt junction capacitance and operating the power converter at a frequency whereby the junction capacitance is operative for shaping the voltage waveform across the power switch with a sharply defined peak region bounded by a gradual ascent and gradual descent in shape of the waveform.
References Cited (Backward Citations)
US4449175A
Cited
US4441117A
Cited
US4449174A
Cited
US4607323A
Cited
US4605999A
Cited
US4685041A
Cited
US4727308A
Cited
US4788634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-01 | 1993-07-03 | 1994-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-01 | 1997-07-03 | 1998-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-01 | 2001-07-03 | 2002-01-02 | $7700.00 | Window Closed / Lapsed |