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| ulv481x0p |
 Wysłany: Pi± 3:53, 11 Mar 2011 Temat postu: Dye measured coordinates |
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For the series of LED lights, change the size of the output power,LED writing board, but only changed the number of LED lights to LED lights n and output voltage,display boards, output current does not change the size. When the output power than the rated power hour, plus the LED lights on the clamping voltage, the output voltage to the LED is rated at this time still, so the current flowing through the LED will become large, making the current feedback signal is greater than the baseline voltage, the duty cycle becomes smaller, the output voltage,LED sign, current flows through the LED's are small, until the rated current value.
Rated power so it can be compatible with the following LED lights. The problem for the no-load losses can be used to detect whether a load access MCU, LED access when not detected, you can turn off the circuit after the class BUCK, reducing the load loss. Finally, the SCR compatibility issues. Constant power control scheme,LED billboard, using pure hardware mode to stabilize the SCR turns on, the adaptability of dimmer or limited.
Constant current control in the MCU program, in addition to stable hardware circuit, as well as software to SCR chopper waveform after the identification processing. Can be set by software to determine the waveform after the chopper is really distortion or dimming, and to determine whether or not to alter the dimming signal. |
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