US5170040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for supplying energy to a heated window pane from an electrical network of a motor vehicle
Assignee: Robert Bosch GmbH
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Filing: 1990-10-26
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Granted: 1992-12-08
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Expires: 2010-10-26
Abstract
Abstract The device for energizing a heating element of a window pane from a direct current network of a motor vehicle includes a converting device for converting the d.c. voltage of the direct current network into an alternating current voltage of a predetermined frequency and a resonant circuit connected to the output of the converting device having a Q-factor high enough to produce a low number of harmonics in operation. The resonant circuit has a resonant frequency corresponding to that of the alternating current voltage. The heating element is a part of a resistance of the resonant circuit. The converting device can include a control circuit for producing alternating control signals, a base driving circuit controlled by the control signals and having two outputs connected respectively to a base of a switching transistor. The device can also include a protecting circuit for picking up energy during opening of the respective switching transistors and returning the picked-up energy to the d.c. network.
Inventors
- 👤 Rainer Wirtz
- 👤 Wunibald Frey
- 👤 Ralph-Gebhard Renk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:26
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/84; B; B60; B60S; B60S1/00; B60S1/02; B60S1/023; B60S1/026; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/337; H02M3/3372; H05B1/00; H05B1/02; H05B1/0227; H05B1/023; H05B1/0236; B60R; B60R16/00; B60R16/02; B60R16/03; H05B2203/00; H05B2203/035
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
A device for energizing a heating element of a window pane from a direct current network of a motor vehicle, comprising means for converting a direct current voltage of the direct current network into an alternating current voltage of a predetermined frequency; and a resonant circuit connected to the converting means and having a resonant frequency corresponding to the predetermined frequency of the alternating current voltage; wherein a heating element of a window pane of a motor vehicle is a component part of a resistance of the resonant circuit and the resonant circuit has a quality factor high enough to produce a low number of harmonics in the resonant circuit.
Claim 2
Independent Claim
110 words
A device for energizing a heating element of a window pane from a direct current network of a motor vehicle, comprising means for converting a direct current voltage of the direct current network into an alternating current voltage of a predetermined frequency; and a resonant circuit connected to the converting means and having a resonant frequency corresponding to the predetermined frequency of the alternating current voltage; wherein a heating element of a window pane of a motor vehicle is a component part of a resistance of the resonant circuit and the resonant circuit has a quality factor high enough to produce a low number of harmonics in the resonant circuit.
Claim 3
Dependent Claim
35 words
A device as defined in claim 1, wherein the resonant circuit is a parallel circuit including a coil, a capacitor and an ohmic resistance; and the heating element being connected parallel to the ohmic resistance.
Claim 4
Dependent Claim
24 words
A device as defined in claim 1, wherein the resonant circuit is a series circuit including a coil, a capacitor and the heating element.
Claim 5
Dependent Claim
39 words
A device as defined in claim 1, wherein the quality factor of the resonant circuit is in a range at which the a.c. voltage applied to the heating element has a sine shape with a low number of harmonics.
Claim 6
Dependent Claim
50 words
A device as defined in claim 1, wherein the converting means includes a resonant converter which comprises a control circuit for producing alternating control signals (U1, U2), a base driving circuit (23) controlled by the control signals and having two outputs connected respectively to a base of a switching transistor.
Claim 7
Dependent Claim
33 words
A device as defined in claim 5, further comprising a protecting circuit (25) for picking up energy during opening of the respective switching transistors and returning the picked-up energy to the d.c. network.
Claim 8
Independent Claim
152 words
A device for energizing a heating element of a window pane from a direct current network of a motor vehicle, comprising means for converting a direct current voltage of the direct current network into an alternating current voltage of a predetermined frequency; and a resonant circuit connected to the converting means and having a resonant frequency corresponding to the predetermined frequency of the alternating current voltage; wherein a heating element of a window pane of a motor vehicle is a component part of a resistance of the resonant circuit and the resonant circuit has a quality factor high enough to produce a low number of harmonics in the resonant circuit; and wherein the converting means includes two switching transistors each having a base, a control circuit for producing alternating control signals, a base driving circuit controlled by the control signals and having two outputs connected to the bases of the switching transistors.
Claim 9
Independent Claim
152 words
A device for energizing a heating element of a window pane from a direct current network of a motor vehicle, comprising means for converting a direct current voltage of the direct current network into an alternating current voltage of a predetermined frequency; and a resonant circuit connected to the converting means and having a resonant frequency corresponding to the predetermined frequency of the alternating current voltage; wherein a heating element of a window pane of a motor vehicle is a component part of a resistance of the resonant circuit and the resonant circuit has a quality factor high enough to produce a low number of harmonics in the resonant circuit; and wherein the converting means includes two switching transistors each having a base, a control circuit for producing alternating control signals, a base driving circuit controlled by the control signals and having two outputs connected to the bases of the switching transistors.
Claim 10
Dependent Claim
33 words
A device as defined in claim 7, further comprising a protecting circuit for picking up energy during opening of the respective switching transistors and returning the picked-up energy to the direct current network.
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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) | 1995-12-08 | 1996-06-08 | 1996-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-08 | 2000-06-08 | 2000-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-08 | 2004-06-08 | 2004-12-08 | $7700.00 | Window Closed / Lapsed |