DRIVER FOR CONNECTING LED TO ELECTRONIC BALLAST
First Claim
1. A driver for driving a light emitting diode circuit, the driver comprisinga first circuit for detuning a resonant tank of an electronic ballast, the first circuit comprising a serial connection of a capacitor and a bidirectional switch, terminals of the serial connection being arranged to be coupled to terminals of the electronic ballast for receiving an alternating current signal from the electronic ballast,a second circuit for providing a direct current signal to the light emitting diode circuit, the second circuit comprising a rectifier with inputs coupled to the terminals of the serial connection and with outputs being arranged to be coupled to terminals of the light emitting diode circuit, anda third circuit for providing a control signal to the first circuit for controlling an amount of power supplied to the light emitting diode circuit.
3 Assignments
0 Petitions
Accused Products
Abstract
To allow an electronic ballast (3) of a fluorescent tube lamp or a similar lamp to be replaced by a light emitting diode circuit (2) without removing the electronic ballast (3), a driver (1) is provided with a first circuit (10) for detuning a resonant tank of the electronic ballast (3). The first circuit (10) comprises a serial connection of a capacitor (11) and a bidirectional switch (12). The serial connection is coupled to the electronic ballast (3) for receiving an alternating current signal. The driver (1) is provided with a second circuit (20) for providing a direct current signal to the light emitting diode circuit (2). The second circuit (20) comprises a rectifier with inputs coupled to the serial connection and with outputs coupled to the light emitting diode circuit (2). Further, the driver (1) is provided with a third circuit (30) for providing a control signal to the first circuit (10) for controlling an amount of power supplied to the light emitting diode circuit (2).
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Citations
14 Claims
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1. A driver for driving a light emitting diode circuit, the driver comprising
a first circuit for detuning a resonant tank of an electronic ballast, the first circuit comprising a serial connection of a capacitor and a bidirectional switch, terminals of the serial connection being arranged to be coupled to terminals of the electronic ballast for receiving an alternating current signal from the electronic ballast, a second circuit for providing a direct current signal to the light emitting diode circuit, the second circuit comprising a rectifier with inputs coupled to the terminals of the serial connection and with outputs being arranged to be coupled to terminals of the light emitting diode circuit, and a third circuit for providing a control signal to the first circuit for controlling an amount of power supplied to the light emitting diode circuit.
Specification