LED lighting apparatus
First Claim
1. An LED lighting apparatus comprising:
- a triac dimmer configured to phase-control an AC input voltage at a given phase ratio and output a phase-controlled AC voltage;
a series circuit connected to the triac dimmer and including a primary winding of a switching transformer and a switching element, the switching transformer having a plurality of windings;
a controller configured to control ON/OFF of the switching element;
a rectifying-smoothing circuit having a first rectifying element and a first smoothing element and configured to rectify and smooth a voltage generated by a secondary winding of the switching transformer;
LEDs connected to an output of the rectifying-smoothing circuit;
a current detector configured to detect a current passing through the LEDs and output a current detection signal;
a voltage detector configured to output a voltage detection signal proportional to a phase ratio of the AC input voltage, the voltage detection signal being based on a winding voltage generating at the secondary winding of the switching transformer or n-th order winding thereof, and the n-th order winding being electromagnetically coupled with the secondary winding wherein n≧
3; and
an amplifier configured to amplify a voltage associating with the current detection signal and voltage detection signal and output the amplified voltage to the controller.
1 Assignment
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Accused Products
Abstract
An LED lighting apparatus includes a triac dimmer 3, a series circuit connected to the triac dimmer and including a primary winding P of a switching transformer T and a switching element Q1, the switching transformer having a plurality of windings, a controller 14 of the switching element, a rectifying-smoothing circuit of a voltage of a secondary winding S of the switching transformer, LEDs 1a to 1n connected to an output of the rectifying-smoothing circuit, a current detector 7 detecting a current of the, a voltage detector 11 configured to output a voltage detection signal of a voltage generated at one of the secondary winding when the first rectifying element is ON, the voltage at the secondary winding being proportional to the phase-controlled AC voltage, and an amplifier 13 amplifying a signal that is based on the current detection signal and voltage detection signal for the controller.
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Citations
3 Claims
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1. An LED lighting apparatus comprising:
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a triac dimmer configured to phase-control an AC input voltage at a given phase ratio and output a phase-controlled AC voltage; a series circuit connected to the triac dimmer and including a primary winding of a switching transformer and a switching element, the switching transformer having a plurality of windings; a controller configured to control ON/OFF of the switching element; a rectifying-smoothing circuit having a first rectifying element and a first smoothing element and configured to rectify and smooth a voltage generated by a secondary winding of the switching transformer; LEDs connected to an output of the rectifying-smoothing circuit; a current detector configured to detect a current passing through the LEDs and output a current detection signal; a voltage detector configured to output a voltage detection signal proportional to a phase ratio of the AC input voltage, the voltage detection signal being based on a winding voltage generating at the secondary winding of the switching transformer or n-th order winding thereof, and the n-th order winding being electromagnetically coupled with the secondary winding wherein n≧
3; andan amplifier configured to amplify a voltage associating with the current detection signal and voltage detection signal and output the amplified voltage to the controller. - View Dependent Claims (2, 3)
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Specification