Portable lighting devices
First Claim
Patent Images
1. A flashlight, comprising:
- a light source;
a main power source that has a limited life cycle, and that provides power from a high voltage range to a low voltage range during the life cycle;
a light source driving circuit for transferring power from the main power source to the light source;
a microcontroller having an output coupled to the light source driving circuit, wherein the microcontroller provides a duty cycle signal to the light source driving circuit, and wherein the duty cycle signal decreases during the life cycle of the main power source.
0 Assignments
0 Petitions
Accused Products
Abstract
A flashlight having a locking mechanism for securing a head skirt to a head assembly is disclosed. A circuit for temporarily remember the mode of operation of the flashlight is also disclosed.
-
Citations
12 Claims
-
1. A flashlight, comprising:
-
a light source; a main power source that has a limited life cycle, and that provides power from a high voltage range to a low voltage range during the life cycle; a light source driving circuit for transferring power from the main power source to the light source; a microcontroller having an output coupled to the light source driving circuit, wherein the microcontroller provides a duty cycle signal to the light source driving circuit, and wherein the duty cycle signal decreases during the life cycle of the main power source. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A flashlight comprising:
-
a light source; a main power source having a limited life cycle, wherein the main power source provides power in a high voltage range, a middle voltage range, and a low voltage range during the life cycle, wherein the intersection between the high voltage range and the middle voltage range represents a first checking voltage, and wherein the intersection between the middle voltage range and the low voltage range represents a second checking voltage; a light source driving circuit for transferring power from the main power source to the light source; and a microcontroller having an output coupled to the light source driving circuit, wherein when the voltage of the main power source is higher than the first checking voltage, the microcontroller provides a high duty cycle signal to the lamp driving circuit to provide a high duty cycle power to the light source, wherein when the voltage of the main power source is lower than the first checking voltage and higher than the second checking voltage, the microcontroller gradually declines the duty cycle signal to the light source driving circuit to provide gradually declined power to the light source, wherein when the voltage of the main power source is lower than the second checking point, the microcontroller provides a low duty cycle signal to the light source driving circuit to provide a low duty cycle power to the light source. - View Dependent Claims (7, 8, 9, 10, 11, 12)
-
Specification