US5430641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronously switching inverter and regulator
Assignee: Dell USA LP
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Filing: 1994-02-07
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Granted: 1995-07-04
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Expires: 2014-02-07
Abstract
Abstract Synchronous switching inverter and regulator suppress rf emissions, and FET push-pull switching for the inverter provides high efficiency power transfer by sinusoidal transformer operation. Feedback control for both pass transistors switching and duty cycles insures overall synchronous behavior.
Inventors
- 👤 Barry K. Kates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:55
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H02M3/3387; H02M3/3388; H02M3/337; H02M3/3372; H02M3/3374; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/538; H02M7/53803; H02M7/53806
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
269 words
A DC-AC inverter, comprising: (a) a power input terminal; (b) an inductor; (c) a pass switch between said power input terminal and a first node of said inductor; (d) a transformer with first and second primaries and a secondary, first nodes of said primaries both coupled to a second node of said inductor; (f) a feedback circuit from said second node of said inductor to a driver coupled to a control of said pass switch; (g) first and second switches with said first switch coupled between a second node of said first primary and ground and said second switch coupled between a second node of said second primary and ground, and wherein said first and second switches are cross coupled, wherein a control of said first switch is coupled to said second node of said second primary and a control of said second switch is coupled to said second node of said first primary; (h) whereby said pass switch operates synchronously with a voltage at said second node of said second primary; (i) first and second buffers, said first buffer with input pulled up and diode-coupled to the drain of said first n-channel transistor and with output coupled to the gate of said second n-channel transistor, and said second buffer with input pulled up and diode-coupled to the drain ot said second n-channel transistor and with output coupled to the drain of said ilrst n-channel transistor; wherein said pass switch is a p-channel field effect transistor; wherein said driver connects to the gate of said p-channel transistor; and wherein said first and second switches are n-channel field effect transistors.
Claim 2
Dependent Claim
269 words
A DC-AC inverter, comprising: (a) a power input terminal; (b) an inductor; (c) a pass switch between said power input terminal and a first node of said inductor; (d) a transformer with first and second primaries and a secondary, first nodes of said primaries both coupled to a second node of said inductor; (f) a feedback circuit from said second node of said inductor to a driver coupled to a control of said pass switch; (g) first and second switches with said first switch coupled between a second node of said first primary and ground and said second switch coupled between a second node of said second primary and ground, and wherein said first and second switches are cross coupled, wherein a control of said first switch is coupled to said second node of said second primary and a control of said second switch is coupled to said second node of said first primary; (h) whereby said pass switch operates synchronously with a voltage at said second node of said second primary; (i) first and second buffers, said first buffer with input pulled up and diode-coupled to the drain of said first n-channel transistor and with output coupled to the gate of said second n-channel transistor, and said second buffer with input pulled up and diode-coupled to the drain ot said second n-channel transistor and with output coupled to the drain of said ilrst n-channel transistor; wherein said pass switch is a p-channel field effect transistor; wherein said driver connects to the gate of said p-channel transistor; and wherein said first and second switches are n-channel field effect transistors.
Claim 3
Dependent Claim
18 words
The inverter of claim 1, further comprising: a capacitor connected between said first primary and said second primary.
Claim 4
Dependent Claim
52 words
The inverter of claim 1, further comprising: (a) a current sense circuit coupled to said secondary; and (b) a second feedback circuit from said current sense circuit to said driver, said second feedback circuit providing a voltage level to said driver and negatively correlated to the duty cycle of said pass switch.
Claim 5
Dependent Claim
18 words
The inverter of claim 1, further comprising: a capacitor connected between said first primary and said second primary.
Claim 6
Dependent Claim
52 words
The inverter of claim 1, further comprising: (a) a current sense circuit coupled to said secondary; and (b) a second feedback circuit from said current sense circuit to said driver, said second feedback circuit providing a voltage level to said driver and negatively correlated to the duty cycle of said pass switch.
Claim 7
Dependent Claim
190 words
A DC-AC inverter. comprising: (a) a power input terminal: (b) an inductor; (c) a pass switch between said power input terminal and a first node of said inductor; (d) a transformer with first and second primaries and a secondary, said first nodes of said primaries both coupled to a second node of said inductor; (f) a feedback circuit from said second node of said inductor to a driver coupled to a control of said pass switch; (g) whereby said pass switch operates synchronously with the voltage at said second node; (h) first and second buffers, said first buffer with input pulled up and diode-coupled to the drain of a first n-channel transistor and with output coupled to the gate of a second n-channel transostpr, and said second buffer with input pulled up and diode-coupled to the drain of said second n-channel transistor and with output coupled to the drain of said first n-channel transistor; (j) wherein said pass switch is a p-channel field effect transistor; (k) wherein said driver connects to the gate of said p-channel transistor; and (l) wherein said first and second switches are n-channel field effect transistors.
Claim 8
Dependent Claim
190 words
A DC-AC inverter. comprising: (a) a power input terminal: (b) an inductor; (c) a pass switch between said power input terminal and a first node of said inductor; (d) a transformer with first and second primaries and a secondary, said first nodes of said primaries both coupled to a second node of said inductor; (f) a feedback circuit from said second node of said inductor to a driver coupled to a control of said pass switch; (g) whereby said pass switch operates synchronously with the voltage at said second node; (h) first and second buffers, said first buffer with input pulled up and diode-coupled to the drain of a first n-channel transistor and with output coupled to the gate of a second n-channel transostpr, and said second buffer with input pulled up and diode-coupled to the drain of said second n-channel transistor and with output coupled to the drain of said first n-channel transistor; (j) wherein said pass switch is a p-channel field effect transistor; (k) wherein said driver connects to the gate of said p-channel transistor; and (l) wherein said first and second switches are n-channel field effect transistors.
Claim 9
Independent Claim
225 words
A system power supply, comprising: (a) a power input terminal; (b) a DC-AC inverter, including: (i) an inductor; (ii) a first pass switch between said power input terminal and a first node of said inductor; (iii) a transformer with first and second primaries and a secondary, first nodes of said primaries both coupled to a second node of said inductor; (iv) a feedback circuit from said second node to a first driver coupled to a control of said first pass switch; and (v) first and second switches with switches with said first switch coupled between a second node of said first primary and ground and said second switch coupled between a second node of said second primary and ground, and wherein said first and second switches are cross coupled, wherein a control of said first switch is coupled to said second node of said second primary and a control of said second switch is coupled to said second node of said first primary; (c) a regulator including: (i) a second pass switch coupled to said power input terminal; and (ii) a second feedback circuit from said second node of said inductor to a second driver coupled to control-said second pass switch; (d) whereby both said first pass switch and said second pass switch operate synchronously with a voltage at said second node of said inductor.
Claim 10
Independent Claim
225 words
A system power supply, comprising: (a) a power input terminal; (b) a DC-AC inverter, including: (i) an inductor; (ii) a first pass switch between said power input terminal and a first node of said inductor; (iii) a transformer with first and second primaries and a secondary, first nodes of said primaries both coupled to a second node of said inductor; (iv) a feedback circuit from said second node to a first driver coupled to a control of said first pass switch; and (v) first and second switches with switches with said first switch coupled between a second node of said first primary and ground and said second switch coupled between a second node of said second primary and ground, and wherein said first and second switches are cross coupled, wherein a control of said first switch is coupled to said second node of said second primary and a control of said second switch is coupled to said second node of said first primary; (c) a regulator including: (i) a second pass switch coupled to said power input terminal; and (ii) a second feedback circuit from said second node of said inductor to a second driver coupled to control-said second pass switch; (d) whereby both said first pass switch and said second pass switch operate synchronously with a voltage at said second node of said inductor.
Claim 11
Dependent Claim
42 words
The power supply of claim 7, further comprising: (a) an inductor coupled between said second pass switch and ground; and (b) a diode with cathode coupled to said second pass switch and said inductor; (c) whereby said regulator is an inverting regulator.
Claim 12
Dependent Claim
42 words
The power supply of claim 7, wherein; (a) said first pass switch is a p-channel field effect transistor; (b) said first driver compeers to the gate of said p-channel transistor; and (c) said first and second switches are n-channel field effect transistors.
Claim 13
Dependent Claim
72 words
The power supply of claim 9, further comprising: (a) first and second buffers, said first buffer with input pulled up and diode-coupled to the drain of said first n-channel transistor and with output coupled to the gate of said second n-channel transistor, and said second buffer with input pulled up and diode-coupled to the drain of said second n-channel transistor and with output coupled to the drain of said first n-channel transistor.
Claim 14
Dependent Claim
56 words
The power supply of claim 10, further comprising: (a) a current sense circuit coupled to said secondary; and (b) a third feedback circuit from said current sense circuit to said first driver, said third feedback circuit providing a voltage level to said first driver and negatively correlated to a duty cycle of said first pass switch.
Claim 15
Dependent Claim
19 words
The power supply of claim 7, further comprising: a capacitor connected between said first primary and said second primary.
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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) | 1998-07-03 | 1999-01-02 | 1999-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-03 | 2003-01-02 | 2003-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-03 | 2007-01-02 | 2007-07-04 | $7700.00 | Window Closed / Lapsed |