13-03-2014 дата публикации
Номер: US20140070715A1
Принадлежит:
An LED constant-current drive circuit includes a BUCK circuit consisting of a transformer T a diode D a capacitor C and a field effect transistor Q a voltage limiting circuit consisting of a resistor R a diode D a capacitor C a resistor R a triode Q a zener diode DZ and a diode D and a current limiting circuit consisting of a resistor R a triode Q a triode Q and a resistor R When the transistor Q is turned on, a current flows through a primary side of the transformer T and an LED load, and then flows through the transistor Q and the resistor R and then flows back to a negative electrode of a power supply. When the transistor Q is turned off, the current flows through the primary side of the transformer T the LED load and the diode D thus forming a loop. 15-. (canceled)6. An LED (light emitting diode) constant-current drive circuit , comprising:{'b': 1', '9', '5', '1, 'a BUCK circuit consisting of a transformer T, a diode D, a capacitor C and a field effect transistor Q;'}{'b': 1', '8', '1', '3', '2', '1', '10, 'a voltage limiting circuit consisting of a resistor R, a diode D, a capacitor C, a resistor R, a triode Q, a zener diode DZ and a diode D; and'}{'b': 4', '3', '4', '2, 'a current limiting circuit consisting of a resistor R, a triode Q, a triode Q and a resistor R,'}{'b': 1', '1', '1', '2', '1', '1', '9, 'wherein when the field effect transistor Q is turned on, a current flows through a primary side of the transformer T and an LED load, and then flows through the field effect transistor Q and the resistor R, and then flows back to a negative electrode of a power supply, and when the field effect transistor Q is turned off, the current flows through the primary side of the transformer T, the LED load and the diode D, thus forming a loop.'}711915918111121121043344314428131231011. The LED constant-current drive circuit claim 6 , as recited in claim 6 , wherein a homonymous terminal at a primary side of the transformer T is connected with a positive electrode of a ...
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