EP0567280A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Quasi-resonant diode drive current source
Assignee: Raytheon Co
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Filing: 1993-04-19
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Granted: —
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Expires: 2013-04-19
Abstract
Abstract A quasi-resonant diode drive current source provides high power pulsed current that drives light emitting diodes, and the like. The pulsed output current of the quasi-resonant diode drive current source is sensed, and is regulated by a control loop to a level required by the light emitting diodes. In a specific embodiment of the invention, a zero-current-switched full wave quasi-resonant buck converter is described that provides a high amplitude pulsed output current required to drive light emitting pump diodes used in a solid state diode pumped laser. The use of a quasi-resonant converter as a pulsed current source provides a much higher conversion efficiency than conventional laser current sources. This higher efficiency results in less input power drawn from a power source and cooler operation, resulting in a higher reliability current source.
Inventors
- 👤 Joe A. Ortiz
- 👤 Joseph H. Ullman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 17:34
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/04; H01S5/042; H01S5/40; H01S5/4025; H02; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/145; H02M3/155; H05; H05B; H05B45/00; H05B45/30; H05B45/37; H05B45/3725; H05B45/375; H05B45/40; H05B45/44; H05B45/46; H01S5/0428; Y; Y02; Y02B; Y02B20/00; Y02B20/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
A current source comprising: a power source; a light emitting diode; a quasi-resonant converter coupled between the power source and the light emitting diode for providing pulsed current to the light emitting diode; sensing means for sensing current flowing through the light emitting diode; and control means coupled to the sensing means for regulating the amplitude of the pulsed current supplied to the light emitting diode.
Claim 2
Dependent Claim
66 words
A current source comprising: a power source; a light emitting diode; a quasi-resonant converter coupled between the power source and the light emitting diode for providing pulsed current to the light emitting diode; sensing means for sensing current flowing through the light emitting diode; and control means coupled to the sensing means for regulating the amplitude of the pulsed current supplied to the light emitting diode.
Claim 3
Dependent Claim
18 words
The current source of Claim 1 wherein the quasi-resonant converter comprises a zero-current-switched full wave quasi-resonant buck converter.
Claim 4
Dependent Claim
45 words
The current source of Claim 2 wherein the quasi-resonant converter comprises a switch transistor having a diode coupled thereacross; a resonant inductor; a filter inductor; and a resonant capacitor and a catch diode coupled in parallel across the filter inductor and the light emitting diode.
Claim 5
Dependent Claim
75 words
A laser drive circuit comprising: a charge supply; charge storage means coupled to the charge supply for storing charge; a plurality of light emitting diode arrays that each contain individual pluralities of light emitting diodes coupled to the charge storage means; a plurality of diode driver circuits respectively coupled to the plurality of light emitting diode arrays, and wherein each of the plurality of diode driver circuits comprises a quasi-resonant diode drive pulsed current source.
Claim 6
Dependent Claim
75 words
A laser drive circuit comprising: a charge supply; charge storage means coupled to the charge supply for storing charge; a plurality of light emitting diode arrays that each contain individual pluralities of light emitting diodes coupled to the charge storage means; a plurality of diode driver circuits respectively coupled to the plurality of light emitting diode arrays, and wherein each of the plurality of diode driver circuits comprises a quasi-resonant diode drive pulsed current source.
Claim 7
Dependent Claim
85 words
The laser drive circuit of Claim 4 wherein each quasi-resonant diode drive current source comprises: a quasi-resonant converter coupled between the charge storage means and a selected one of the plurality of light emitting diode arrays for providing pulsed current to the light emitting diodes of the arrays; sensing means for sensing current flowing through the selected light emitting diode array; and control means coupled to the sensing means for regulating the amplitude of the pulsed current supplied to the selected light emitting diode array.
Claim 8
Dependent Claim
19 words
The laser drive circuit of Claim 5 wherein the quasi-resonant converter comprises a zero-current-switched full wave quasi-resonant buck converter.
Claim 9
Dependent Claim
81 words
The laser drive circuit of Claim 6 wherein the quasi-resonant converter comprises: switching means coupled between the charge storage means and a selected one of the plurality of light emitting diode arrays; a resonant inductor and a filter inductor serially coupled between the switching means and the selected one of the plurality of light emitting diode arrays; a catch diode and a resonant capacitor coupled across the filter inductor and the selected one of the plurality of light emitting diode arrays.
References Cited (Backward Citations)
No citation records indexed.
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