LED power supply

• Main Author: LI BINGJUN
• Format: Patent
• Language: English
• Published: 27.05.2015
• Subjects: BLASTING; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED; LIGHTING; MECHANICAL ENGINEERING; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; WEAPONS

The invention discloses an LED power supply. The LED power supply comprises a primary input circuit, a rectification filter circuit, a PFC circuit, a voltage converting circuit, and a secondary output circuit which are successively connected, wherein the voltage converting circuit is also connected with a fan module used for dissipating heat of the LED power supply; the secondary output circuit is connected with an LED load; a current limiting circuit is also connected between the secondary output circuit and the LED load; the PFC circuit is an active PFC circuit. Compared with the prior art, the LED power supply provided by the invention has the advantages of high power factors and good heat dissipation; besides, the current limiting circuit is arranged between the secondary output circuit and the LED load, when an electric current of the LED power supply is too large due to an unexpected reason, the current limiting circuit has the function of flow limitation, and the LED load is prevented from being burned down.