US5642276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency surface mount transformer-diode power module
Assignee: Nokia of America Corp
•
Filing: 1995-02-08
•
Granted: 1997-06-24
•
Expires: 2015-02-08
Abstract
Abstract An integral transformer/rectifier component includes a lead frame having terminals for connecting to conductors of a circuit substrate. A transformer primary and secondary winding is mounted on the lead frame and a rectifying diode is mounted on the same frame and is directly connected to a winding terminal end of the secondary winding, The transformer windings and diode are encapsulated in a thermoset plastic. A terminal end of the diode is extended beyond the encapsulation and used as an output terminal of the integral transformer/rectifier component.
Inventors
- 👤 Ashraf Wagih Lotfi
- 👤 Lennart Daniel Pitzele
- 👤 John David Weld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:21
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/003; H01; H01F; H01F17/00; H01F17/0006; H01F19/00; H01F19/04; H01F27/00; H01F27/28; H01F27/29; H01F27/292; H02M7/02; H02M7/04; H02M7/06; H02M7/068; H10; H10W; H10W70/00; H10W70/40; H10W70/421
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
49 words
An integral transformer/rectifier device, comprising: a lead frame for attachment to conductors of a circuit substrate; a transformer winding mounted on the lead frame; a diode die mounted on the lead frame and directly connected to the transformer winding; and an encapsulant enclosing the transformer winding and diode die.
Claim 2
Dependent Claim
49 words
An integral transformer/rectifier device, comprising: a lead frame for attachment to conductors of a circuit substrate; a transformer winding mounted on the lead frame; a diode die mounted on the lead frame and directly connected to the transformer winding; and an encapsulant enclosing the transformer winding and diode die.
Claim 3
Dependent Claim
20 words
An integral transformer/rectifier device as claimed in claim 1: wherein the transformer winding comprises a primary and a secondary winding.
Claim 4
Dependent Claim
17 words
An integral transformer/rectifier device as claimed in claim 2: wherein the transformer winding comprises a flex substrate.
Claim 5
Dependent Claim
17 words
An integral transformer/rectifier device as claimed in claim 3: wherein the encapsulant is a thermoset plastic compound.
Claim 6
Dependent Claim
15 words
An integral transformer/rectifier device as claimed in claim 4: wherein the device is surface mountable.
Claim 7
Dependent Claim
88 words
An integral transformer rectifier device, comprising: a lead frame including conductor elements for attachment to conductors of a circuit substrate; a transformer winding mounted on the lead frame; a diode die mounted on the lead frame and connected by lead frame conductors to the transformer winding; an encapsulant enclosing the transformer winding and leaving a single surface of the diode die exposed; an element mounted on the exposed single surface of the diode die and connected to provide heat transfer and an electrical connection to the diode die.
Claim 8
Dependent Claim
88 words
An integral transformer rectifier device, comprising: a lead frame including conductor elements for attachment to conductors of a circuit substrate; a transformer winding mounted on the lead frame; a diode die mounted on the lead frame and connected by lead frame conductors to the transformer winding; an encapsulant enclosing the transformer winding and leaving a single surface of the diode die exposed; an element mounted on the exposed single surface of the diode die and connected to provide heat transfer and an electrical connection to the diode die.
Claim 9
Dependent Claim
21 words
An integral transformer rectifier device, as claimed in claim 6, wherein the transformer winding comprises a primary and a secondary winding.
Claim 10
Dependent Claim
19 words
An integral transformer rectifier device, as claimed in claim 7: wherein the transformer winding comprises a laminated flex substrate.
Claim 11
Dependent Claim
18 words
An integral transformer rectifier device, as claimed in claim 8: wherein the encapsulant is a thermoset plastic compound.
Claim 12
Dependent Claim
16 words
An integral transformer rectifier device, as claimed in claim 9, wherein the device is surface mountable.
Claim 13
Independent Claim
93 words
A method of constructing an integral transformer/rectifier device, comprising the steps of: constructing a lead frame having conducting leads for attachment to conductors of a circuit substrate; mounting a transformer winding on the lead frame; mounting a diode die on the lead frame, the transformer winding and the diode die being electrically coupled; encapsulating the transformer winding and the diode die with an encapsulant leaving an exposed diode die surface; and mounting a heat dissipating metallic member on the exposed surface of the diode die for enabling heat transfer to the ambient environment.
Claim 14
Independent Claim
93 words
A method of constructing an integral transformer/rectifier device, comprising the steps of: constructing a lead frame having conducting leads for attachment to conductors of a circuit substrate; mounting a transformer winding on the lead frame; mounting a diode die on the lead frame, the transformer winding and the diode die being electrically coupled; encapsulating the transformer winding and the diode die with an encapsulant leaving an exposed diode die surface; and mounting a heat dissipating metallic member on the exposed surface of the diode die for enabling heat transfer to the ambient environment.
Claim 15
Dependent Claim
39 words
A method of constructing an integral transformer/rectifier device, as claimed in claim 11; comprising the further steps of: mounting a second diode die on the lead frame and mounting a second heat dissipating metallic member on the second die.
Claim 16
Dependent Claim
25 words
A method of constructing an integral transformer/rectifier device, as claimed in claim 11; comprising the further steps of: mounting the device on a circuit substrate.
Claim 17
Dependent Claim
33 words
A method of constructing an integral transformer/rectifier device, as claimed in claim 11; comprising the further steps of: heating and attaching the diode die to the lead frame prior to the encapsulation step.
Claim 18
Dependent Claim
24 words
A method of constructing an integral transformer/rectifier device, as claimed in claim 14; comprising the further steps of: creating a cavity in the encapsulant.
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) | 2000-06-23 | 2000-12-23 | 2001-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-23 | 2004-12-23 | 2005-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-23 | 2008-12-23 | 2009-06-24 | $7700.00 | Window Closed / Lapsed |