Portable lighting device and method for supplying power to load circuit
A technology for lighting devices and load circuits, which is applied to portable lighting devices, components of lighting devices, lighting devices, etc., can solve the problems of changing power supply, impracticality, and lack of efficiency, and achieve the reduction of circuit application restrictions and extension The effect of service life and reducing the number of batteries
Inactive Publication Date: 2010-09-22
AOTU ELECTRONICS WUHAN
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Problems solved by technology
[0008] Furthermore, if the user replaces LEDs with different power specifications, the circuit design using current-limiting resistors will face practical limitations
For example, if the user wants to obtain 10 times the power and replaces the LED with a rated current of 100mA with a 1A LED, however, since the current limiting resistor is pre-designed and fixed, the current flowing through the LED will not change, so it cannot meet user expectations
In addition, because the configuration of the battery pack needs to consider the mechanism design of the flashlight at the same time, it is usually impossible to change the number of batteries arbitrarily to change the power supply
All in all, such current limiting resistors are impractical and inefficient for battery-operated flashlight applications, hampering circuit design and application flexibility
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[0025] A detailed description will be given below of embodiments of the present invention. While the invention will be described in conjunction with examples, it will be understood that it is not intended to limit the invention to these examples. On the contrary, the invention is intended to cover various alternatives, modifications and equivalents as defined within the spirit and scope of the invention as defined by the appended claims.
[0026] Please refer to figure 2 , which is an exemplary circuit diagram of the electronic circuit 200 of the portable lighting device according to an embodiment of the present invention. In one embodiment, the portable lighting device is a flashlight. The electronic circuit 200 includes a battery power source (VBatt) 210, a switch 220, a light emitting element 230, a sensing element 240, a controller 250 and an inductor L1. In one embodiment, battery power source 210 is one or more alkaline batteries. In one embodiment, the light emittin...
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The invention discloses a portable lighting device and a method for supplying power to load circuit. The portable lighting device comprises a power supply, a controller and a load circuit. The controller comprises a power supply input terminal, and the power supply input terminal is electrically connected with a power supply by virtue of a first switch. The load circuit is electrically connected with the power supply output terminal of the controller and can generate a feedback signal. The controller regulates the electric energy supplied to the load circuit by virtue of the power supply output terminal according to the state of a first switch and the feedback signal at least. The portable lighting device of the invention can improve flexibility of circuit design and application and can prolong the service life of the portable lighting device.
Description
technical field [0001] The invention relates to a lighting device, in particular to a portable lighting device and a method for supplying power to a load circuit. Background technique [0002] Portable lighting devices, such as household flashlights, are generally illuminated by incandescent lamps. In recent years, light emitting diodes (Light Emitting Diodes, LEDs) have gradually developed into backlights for Liquid Crystal Displays (LCDs), light sources for household lighting fixtures and street lamps. Since LEDs have better luminous efficiency and longer service life than incandescent lamps, it is becoming more and more common to use LEDs as light sources for flashlights. [0003] Traditional flashlights require batteries for power. However, the surge power applied to the lamp at the moment the flashlight is turned on will damage the lamp, thereby reducing the service life of the lamp. The most common solution is to add a current limiting resistor (current limiting res...
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IPC IPC(8): F21L4/00F21V23/00H05B37/02F21Y101/02
CPCY02B20/346H05B33/0815H05B33/0824H05B45/44Y02B20/30H05B45/3725H05B45/375H05B45/38
Inventor 林永霖李勝泰
Owner AOTU ELECTRONICS WUHAN