Dimmable LED lamp and dimmable LED lighting apparatus
First Claim
1. A dimmable light-emitting diode (LED) lamp, comprising:
- a bridge rectifier, receiving a source alternating current (AC) voltage through a wall switch and providing a rectified direct current (DC) voltage;
a toggle detector, monitoring a toggle action of the wall switch;
a sustain voltage supply circuit, providing a sustain voltage according to a bias AC voltage, wherein the bias AC voltage is a induced voltage and provided only when the wall switch is turned on;
a counter, receiving the sustain voltage for operation, storing and providing an counting value that changes when the toggle detector detects the toggle action of the wall switch;
an LED light source;
an LED lighting driver, converting the rectified DC voltage to a constant current to drive the LED light source and providing multi-level dimming to the LED light source according to the counting value, wherein the LED lighting driver comprises;
an inductor, coupled to the LED light source;
a free-wheeling diode, comprising an anode coupled to the inductor and a cathode coupled to the rectified DC voltage and the LED light sourcea power metal-oxide-semiconductor field-effect transistor (MOSFET), coupled between the anode of the free-wheeling diode and a ground; and
a switching controller, receiving the bias DC voltage for operation and controlling the multi-level dimming by controlling a switching duty cycle of the power MOSFET according to the counting value; and
a bias voltage supply circuit, providing the bias AC voltage and a bias DC voltage, rectifying the bias AC voltage and filters out ripples in the rectified bias AC voltage and, providing a result of the filtering as the bias DC voltage to be received by the LED lighting driver for operation, and comprises a bias winding electro-magnetically coupled to the inductor via sharing a common magnetic core, the bias winding provides the bias AC voltage by receiving power from the inductor when the MOSFET is switching.
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Abstract
A dimmable light-emitting diode (LED) lamp and a dimmable LED lighting apparatus thereof are provided. The dimmable LED lamp includes a bridge rectifier, a toggle detector, a sustain voltage supply circuit, a counter, an LED light source, and an LED lighting driver. The bridge rectifier receives a source alternating current (AC) voltage through a wall switch and provides a rectified direct current (DC) voltage. The toggle detector monitors a toggle action of the wall switch. The sustain voltage supply circuit provides a sustain voltage. The counter receives the sustain voltage for operation. Moreover, the counter stores and provides an counting value that changes when the toggle detector detects the toggle action. The LED lighting driver converts the rectified DC voltage to a constant current to drive the LED light source. The LED lighting driver also provides multi-level dimming to the LED light source according to the counting value.
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Citations
15 Claims
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1. A dimmable light-emitting diode (LED) lamp, comprising:
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a bridge rectifier, receiving a source alternating current (AC) voltage through a wall switch and providing a rectified direct current (DC) voltage; a toggle detector, monitoring a toggle action of the wall switch; a sustain voltage supply circuit, providing a sustain voltage according to a bias AC voltage, wherein the bias AC voltage is a induced voltage and provided only when the wall switch is turned on; a counter, receiving the sustain voltage for operation, storing and providing an counting value that changes when the toggle detector detects the toggle action of the wall switch; an LED light source; an LED lighting driver, converting the rectified DC voltage to a constant current to drive the LED light source and providing multi-level dimming to the LED light source according to the counting value, wherein the LED lighting driver comprises; an inductor, coupled to the LED light source; a free-wheeling diode, comprising an anode coupled to the inductor and a cathode coupled to the rectified DC voltage and the LED light source a power metal-oxide-semiconductor field-effect transistor (MOSFET), coupled between the anode of the free-wheeling diode and a ground; and a switching controller, receiving the bias DC voltage for operation and controlling the multi-level dimming by controlling a switching duty cycle of the power MOSFET according to the counting value; and a bias voltage supply circuit, providing the bias AC voltage and a bias DC voltage, rectifying the bias AC voltage and filters out ripples in the rectified bias AC voltage and, providing a result of the filtering as the bias DC voltage to be received by the LED lighting driver for operation, and comprises a bias winding electro-magnetically coupled to the inductor via sharing a common magnetic core, the bias winding provides the bias AC voltage by receiving power from the inductor when the MOSFET is switching. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A dimmable light-emitting diode (LED) lighting apparatus, comprising:
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a toggle detector, monitoring a toggle action of a wall switch that controls a rectified direct current (DC) voltage; a sustain voltage supply circuit, providing a sustain voltage according to a bias AC voltage, wherein the bias AC voltage is a induced voltage and provided only when the wall switch is turned on; a counter, receiving the sustain voltage for operation, storing and providing an counting value that changes when the toggle detector detects the toggle action of the wall switch; an LED lighting driver, converting the rectified DC voltage to a constant current to drive an LED light source and providing multi-level dimming to the LED light source according to the counting value, wherein the LED lighting driver comprises; an inductor, coupled to the LED light source; a free-wheeling diode, comprising an anode coupled to the inductor and a cathode coupled to the rectified DC voltage and the LED light source a power metal-oxide-semiconductor field-effect transistor (MOSFET), coupled between the anode of the free-wheeling diode and a ground; and a switching controller, receiving the bias DC voltage for operation and controlling the multi-level dimming by controlling a switching duty cycle of the power MOSFET according to the counting value; and a bias voltage supply circuit, providing the bias AC voltage and a bias DC voltage, rectifying the bias AC voltage and filters out ripples in the rectified bias AC voltage and, providing a result of the filtering as the bias DC voltage to be received by the LED lighting driver for operation, and comprises a bias winding electro-magnetically coupled to the inductor via sharing a common magnetic core, the bias winding provides the bias AC voltage by receiving power from the inductor when the MOSFET is switching. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification