Drive and switch on the LED linear type drive

Drive and switch on the LED linear type drive

The LED drive mode generally has two kinds: linear actuation and switch type drive.
Linear actuation application is one of the most simple and most direct way to drive application. In the lighting level in white LED light application, although there are issues such as low efficiency, and regulatory, but because of its circuit is simple, small size, can satisfy some particular place used more often.

Switch mode to good drive current control precision and high efficiency, the application of the general way are divided into step-down type and boost type two kinds big. Buck type switch on the power supply voltage driver is higher than the voltage is DuoGe LED or LED the parallel drive the application. The boost type switch on the power supply voltage driver is lower than the voltage is DuoGe LED or series drive LED the application.

Generally, isolation type drive safety but low efficiency, the isolation type high efficiency drive, should according to actual use requirements to choose. The current design general basic LED drive relatively simple lighting applications, but if you need other functions such as phase control light and power factor correction (PFC), the design is become complicated. No power factor correction function of the light LED drive usually contains an offline type switch power, used for constant electricity output regulation down.

The back-end architecture LED drive contains a with short circuit protection function of current control circuit. Can use linear control circuit achieve this objective, the method, however, is so low efficiency itself low output current, don't usually applied to the multilevel structure. Alternative method is to use simple, with current feedback function of the hypotensive stabilizer circuit, in order to limit the output current more than expected LED drive current. The forward voltage offset the total LED with temperature and device of tolerance change, also limit the short circuit or other fault conditions in the current, so it can be protected drive from damage.

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