Light emitting diode (LED) emergency lamp and drive circuit thereof
A technology for driving circuits and lamps, which is applied in the layout of electric lamp circuits, electric light sources, light sources, etc., which can solve problems such as shortening the service life of relays, relay arcing, discharge, and damage to emergency lighting loads, so as to avoid adverse effects and improve service life. , the effect of improving reliability
Active Publication Date: 2013-05-08
OCEANKING DONGGUAN LIGHTING TECH +2
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Problems solved by technology
Due to the existence of emergency lighting loads, it is easy to cause the relay to arc and discharge when switching contacts, which shortens the service life of the relay; and the inrush current generated at the moment of relay switching will also cause greater damage to the emergency lighting load. Affects the reliability of the emergency lighting circuit
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[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0021] see figure 1 , is a structural block diagram of the driving circuit of the LED emergency lamp in an embodiment of the present invention. The drive circuit includes a DC backup power supply unit 200 , a switch control unit 300 , and a constant current and voltage limiting unit 400 . Wherein the input end of the constant current voltage limiting unit 400 is connected to the DC backup power supply unit 200, and the output end is connected to the LED load 500, ...
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The invention discloses a light emitting diode (LED) emergency lamp and a drive circuit of the LED emergency lamp. The drive circuit comprises an alternating current (AC) electric supply unit, a direct current (DC) backup power supply unit, an on-off control unit and a constant-current voltage-limiting unit, wherein an input end of the constant-current voltage-limiting unit is connected with the DC backup power supply unit and the on-off control unit, an output end of the constant-current voltage-limiting unit is connected with an LED load, the on-off control unit controls and starts the constant-current voltage-limiting unit after the AC electric supply unit is shut down, the DC backup power supply unit is used for providing constant current for the LED load through the constant-current voltage-limiting unit, and therefore the situation that adverse effect happens to the LED load due to impact current generated when a relay is switched is avoided. The constant-current voltage-limiting unit is connected between the on-off control unit and the LED load, the direct connection between the on-off control unit and the LED load is avoided so that the fact that the arcing and discharge phenomena happen to the relay is avoided, the service life of the relay is prolonged, and therefore the circuit reliability of the LED emergency lamp is improved.
Description
technical field [0001] The invention relates to the field of LED emergency lighting lamps, in particular to an LED emergency lighting lamp and a driving circuit thereof. Background technique [0002] Emergency lighting is a very important lighting device. It automatically charges the backup battery when the main power supply is normal, and automatically switches the backup battery power supply after the main power supply fails to provide emergency lighting. It is widely used in densely populated places such as high-rise buildings, teaching buildings, shopping malls and entertainment venues. It can be used for the safe evacuation of people in the event of a building fire, fire emergency lighting, and navigation direction indication, etc., so it plays a very important role in people's lives, and is even called the "light of life". LED lights are widely used in the field of emergency lighting because of their advantages such as long life, low energy consumption, high color ren...
Claims
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Inventor 周明杰孙占民
Owner OCEANKING DONGGUAN LIGHTING TECH