Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Patent
1996-06-12
1998-04-07
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
327515, 327530, 372 25, 323269, H03K 3017
Patent
active
057368813
ABSTRACT:
A current source that uses a regulated constant current power source to supply current to drive a load, and the load current is controlled by shunt switches. If a plurality of loads utilize less than 50% duty factor, then one current source can drive N multiple dissimilar impedance loads, each at 100%/N duty factor. The current source includes a power converter coupled between the power source and the load(s) for providing pulsed current thereto. A current sensor is provided for sensing current flowing through the loads. A controller is coupled between the sensor and the power converter for regulating the amplitude of the output current supplied to the loads. A shunt switch is coupled across the loads, and a duty factor controller is coupled to the shunt switch for setting the duty factor of the shunt switch. A laser drive circuit, or driving light emitting diode arrays is also disclosed that include a plurality of the current sources. Alternatively, if the duty factor is sufficiently low, one current source may be used to drive a plurality of arrays.
REFERENCES:
patent: 4114051 (1978-09-01), Curtice
patent: 4161023 (1979-07-01), Goffeau
patent: 4323845 (1982-04-01), Leach
patent: 4673865 (1987-06-01), DeLuca et al.
patent: 4720668 (1988-01-01), Lee et al.
patent: 4723312 (1988-02-01), Yamashita et al.
patent: 4745610 (1988-05-01), Yoshikawa
patent: 4751524 (1988-06-01), Balchunas
patent: 4807239 (1989-02-01), Takano et al.
patent: 5140175 (1992-08-01), Yagi et al.
patent: 5182756 (1993-01-01), Waki et al.
patent: 5287372 (1994-02-01), Ortiz
patent: 5291505 (1994-03-01), Nielson
patent: 5315606 (1994-05-01), Tanaka
patent: 5349595 (1994-09-01), Ogawa et al.
patent: 5491491 (1996-02-01), Lebby et al.
"GaAs MESFET Laser-Driver for 1.7 Gbit/s Lightwave Transmitter", F. S. Chen et al., Journal of Lightwave Technology. vol. 6. No. 3. March 1988.
Callahan Timothy P.
Denson-Low Wanda K.
Hughes Electronics
Kim Jung Ho
Lindeen III Gordon R.
LandOfFree
Diode drive current source does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Diode drive current source, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diode drive current source will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-16330