Apparatus for controlling LED string
A control device, N-type technology, applied in lighting devices, lamp circuit layout, use of semiconductor lamps, etc., can solve the problems of discontinuous instantaneous current, dark brightness, bright brightness of front-end LED, etc., to achieve fast opening and closing, reduce EMI interference, the effect of continuous input current
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[0052] figure 1One of the preferred embodiments of the control device for high-voltage LEDs of the present invention is shown. The small LED string 70 has five LED units 701-705, and each LED unit includes several LEDs. The control device includes 5 corresponding high-voltage N-type components (HV NMOS) HV1-HV5, 5 low-voltage current limiting switches (or constant current switches) 21-25 and an external master-slave control in sequence from high potential to low potential Device 51. "External" or "built-in" in this specification is relative to the low-voltage current-limiting switch.
[0053] The current input end of the LED string 70 is connected to an AC power source 901 and a bridge rectifier 902 . The small LED string 70 can be a part of a long LED string, and the control device can also control the corresponding small LED string in series.
[0054] In the small LED string 70 , the current output terminal of each LED unit is connected to the drain of the corresponding ...
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