Light emitting apparatus with current limiting

Details Light emitting apparatus with current limiting Light emitting apparatus with current limiting

2008-02-15

2010-06-22

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S291000, C315S307000, C315S312000, C315S18500S

Reexamination Certificate

active

07741788

ABSTRACT:
In conduction of light emitting diodes LEDs1to4, a switching signal101is converted into a voltage V2or 0V through a signal converter26in accordance with a logic level thereof. The voltage obtained by the conversion is compared with a voltage V1on both ends of a resistor R1through an operational amplifier20to open/close an output loop by an NMOS transistor22, a current If of the light emitting diodes LEDs1to4is limited to a current If1so as not to exceed a maximum current, and a current defined with an ON duty of the switching signal101is caused to flow as a mean current to the light emitting diodes LEDs1to4to inhibit an overshoot current from flowing to the light emitting diodes LEDs1to4while the output loop is closed.

REFERENCES:
patent: 5808440 (1998-09-01), Bennett et al.
patent: 6636003 (2003-10-01), Rahm et al.
patent: 6858994 (2005-02-01), Vollrath
patent: 6864641 (2005-03-01), Dygert
patent: 7205727 (2007-04-01), Takeshita et al.
patent: 7425943 (2008-09-01), Furukawa
patent: 2007/0262796 (2007-11-01), Murakami
patent: 2008/0018261 (2008-01-01), Kastner
patent: 2008/0191642 (2008-08-01), Slot et al.
patent: 2001-215913 (2001-08-01), None
patent: 2006-86063 (2006-03-01), None

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