Electronic circuit reducing and boosting voltage for controlling LED current
First Claim
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1. An electronic circuit for operating a solid state light source comprising:
- a switching voltage boosting circuit for controllably providing a potential greater than a supply potential;
a current regulating circuit coupled to said switching voltage boosting circuit for controlling current flowing through a solid state light source; and
a control circuit responsive to current flowing through the solid state light source for controlling said current regulating circuit to control the magnitude of current flowing through the solid state light source and for controlling said switching voltage boosting circuit to provide the potential greater than the supply potential for operating said current regulating circuit.
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Abstract
An electronic circuit comprises a switching voltage boosting circuit and a current regulating circuit for controlling current flowing through a solid state light source. A control circuit controls the current regulating circuit and the switching voltage boosting circuit to control the magnitude of current flowing through the solid state light source. An error signal produced by the control circuit for controlling the current flowing through the solid state light source may further control the switching voltage boosting circuit.
150 Citations
47 Claims
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1. An electronic circuit for operating a solid state light source comprising:
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a switching voltage boosting circuit for controllably providing a potential greater than a supply potential; a current regulating circuit coupled to said switching voltage boosting circuit for controlling current flowing through a solid state light source; and a control circuit responsive to current flowing through the solid state light source for controlling said current regulating circuit to control the magnitude of current flowing through the solid state light source and for controlling said switching voltage boosting circuit to provide the potential greater than the supply potential for operating said current regulating circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 41, 44)
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9. An electronic circuit for operating a solid state light source comprising:
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a switching voltage boosting circuit for controllably providing a potential greater than a supply potential; a current regulating circuit coupled to said switching voltage boosting circuit and including a feedback circuit for sensing the current flowing through a solid state light source to control the magnitude thereof; and a control circuit responsive to an error signal of the feedback circuit of said current regulating circuit for controlling said switching voltage boosting circuit to provide the potential greater than the supply potential for operating said current regulating circuit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 45)
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17. An electronic circuit for operating a solid state light source comprising:
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a pair of input terminals for receiving a supply potential therebetween; a pair of output terminals for connecting a solid state light source therebetween; a switching voltage boosting circuit connected between the input terminals and to a node for controllably providing at the node a potential greater than the supply potential received at said pair of input terminals; a linear current regulating circuit connected between the node and the output terminals for controlling the current flowing between the output terminals; and a control circuit responsive to current flowing between the output terminals for controlling said linear current regulating circuit to control the magnitude of current flowing between the output terminals and for controlling said switching voltage boosting circuit to increase the potential at said node when the supply potential is less than that necessary for operating said linear current regulating circuit. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 42, 46)
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25. An electronic circuit for a flashlight comprising:
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a battery providing a voltage; a solid state light source; a switching voltage boosting circuit coupled to said battery for controllably providing at a node a voltage greater than the battery voltage; a current regulating circuit coupled to said node, to said switching voltage boosting circuit and to said solid state light source for controlling the current flowing through said solid state light source; and a control circuit responsive to the current flowing through said solid state light source for controlling said current regulating circuit to regulate the magnitude of current flowing through said solid state light source and for controlling said switching voltage boosting circuit to provide at the node the voltage greater than the battery voltage for operating said current regulating circuit. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 43, 47)
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33. An electronic circuit in a flashlight comprising:
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a flashlight housing; a battery disposed in said flashlight housing for providing a voltage; a solid state light source disposed in said flashlight housing for projecting light therefrom; a switching voltage boosting circuit disposed in said flashlight housing and coupled to said battery for controllably providing a voltage greater than the battery voltage; a linear current regulating circuit disposed in said flashlight housing and coupled to said switching voltage boosting circuit, said linear current regulating circuit including a feedback circuit for sensing the current flowing through said solid state light source to control the magnitude thereof; and a control circuit responsive to an error signal of the feedback circuit of said linear current regulating circuit for controlling said switching voltage boosting circuit to provide the voltage greater than the battery voltage when necessary for said linear current regulating circuit to control the magnitude of the current flowing through said solid state light source. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40)
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Specification