Power supply system for a semiconductor light source
First Claim
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1. A power supply system for a semiconductor light source comprising:
- a power regulating circuit having the output thereof controlled by a signal characteristic of the power emitted by said source;
a control circuit for said source having an output connected to said source for providing a control current;
a ramp generator;
a switching circuit having a first input, a second input, a control input and an output, said ramp generator being connected to said first input of said switching circuit, said output of said regulating circuit being connected to said second input of said switching circuit, the output of said switching circuit being connected to the input of said control circuit, and said control input of said switching circuit being connected to the output of said regulating circuit, said switching circuit being responsive to the signal applied to said control input for connecting the output of said switching circuit to said first input during a transitory phase and to said second input during a steady phase, the end of said transitory phase being determined when a predetermined threshold in the emitted power is reached.
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Abstract
The invention relates to a power supply system for a semiconductor light source of which the power is regulated in the steady state by a regulating loop comprising an electronic switching circuit controlled by a signal characteristic of the power emitted by the laser which closes the regulating loop when the output power has reached, a threshold power, a ramp generator supplying a ramp of current to the laser solely from the instant when the feed voltage is established for reaching the threshold.
23 Citations
11 Claims
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1. A power supply system for a semiconductor light source comprising:
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a power regulating circuit having the output thereof controlled by a signal characteristic of the power emitted by said source; a control circuit for said source having an output connected to said source for providing a control current; a ramp generator; a switching circuit having a first input, a second input, a control input and an output, said ramp generator being connected to said first input of said switching circuit, said output of said regulating circuit being connected to said second input of said switching circuit, the output of said switching circuit being connected to the input of said control circuit, and said control input of said switching circuit being connected to the output of said regulating circuit, said switching circuit being responsive to the signal applied to said control input for connecting the output of said switching circuit to said first input during a transitory phase and to said second input during a steady phase, the end of said transitory phase being determined when a predetermined threshold in the emitted power is reached. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A regulated power supply for a light source comprising:
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means for sensing the output characteristics of said light source; means for obtaining a signal of increasing magnitude; means responsive to said sensing means for selectively providing at the output thereof one of said signal of increasing magnitude and a signal indicative of said output characteristics; and means responsive to the output of said selective providing means for supplying a control current to said light source. - View Dependent Claims (8, 9, 10, 11)
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Specification