Portable Lighting Devices

摘要

A method for controlling a portable lighting device. The device has a switched-mode power supply, a light source, a high frequency switch, a controller controlling the operation of the light source and a user interface for inputting commands to the controller. A DC power source has a negative pole that is connected by only one single electric contact with the lighting device tail. The method for controlling a portable lighting device includes connecting a DC power source, an inductor, a light source, a high frequency switch and a resistor in series, measuring a voltage across the resistor, and controlling the high frequency switch dependent on the voltage measured across the resistor.

主权项

1. A flashlight, comprising:
a light-emitting diode (“LED”) located in a head section of the flashlight; a man-machine interface located in a tail section of the flashlight configured to allow a user to select from a plurality of modes of operation of the flashlight; a barrel which holds a DC power source and separates the head section from the tail section; an electrical circuit containing the following elements connected in series: the DC power source, an inductor, the LED, and a high frequency switch; and a controller which controls a current through the LED by calculating a battery current between the DC power source and the high frequency switch; wherein the current through the LED is controlled without measuring the current through the LED.