Light emitting diode (LED) driver having direct replacement capabilities
First Claim
1. A driver circuit for powering a load, comprising:
- an input for connection to a ballast;
a rectifier for converting AC power received from the input into DC power, the rectifier including a rectifier input;
a switch electrically connected to the rectifier input, wherein the switch is activated to create a short circuit at the rectifier inputs in response to receiving an activation signal;
a fault circuit electrically connected to the switch, wherein the fault circuit generates the activation signal in response to detecting at least one of an over voltage, an over temperature, and an over current condition of the driver circuit; and
a charge pump circuit for providing substantially constant DC current to the fault circuit, the charge pump circuit including a first capacitor and a zener diode, wherein the first capacitor limits current to the zener diode and the zener diode limits a voltage provided to the fault circuit.
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Accused Products
Abstract
A driver circuit for powering a load is disclosed. The driver circuit includes an input for connection to a ballast, a rectifier, a switch, and a fault circuit. The rectifier converts AC power received from the input into DC power. The rectifier includes a rectifier input. The switch is electrically connected to the rectifier input. The switch is activated to create a short circuit at the rectifier inputs in response to receiving an activation signal. The fault circuit is electrically connected to the switch. The fault circuit generates the activation signal in response to detecting at least one of an over voltage, an over temperature, and an over current condition of the driver circuit.
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Citations
25 Claims
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1. A driver circuit for powering a load, comprising:
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an input for connection to a ballast; a rectifier for converting AC power received from the input into DC power, the rectifier including a rectifier input; a switch electrically connected to the rectifier input, wherein the switch is activated to create a short circuit at the rectifier inputs in response to receiving an activation signal; a fault circuit electrically connected to the switch, wherein the fault circuit generates the activation signal in response to detecting at least one of an over voltage, an over temperature, and an over current condition of the driver circuit; and a charge pump circuit for providing substantially constant DC current to the fault circuit, the charge pump circuit including a first capacitor and a zener diode, wherein the first capacitor limits current to the zener diode and the zener diode limits a voltage provided to the fault circuit. - View Dependent Claims (2, 3, 4, 5)
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6. A driver circuit for powering a light emitting diode (LED) tube light, comprising:
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an input for connection to a ballast; a rectifier for converting AC power received from the input into DC power, the rectifier including a rectifier input; a switch electrically connected to the rectifier input, wherein the switch is activated to create a short circuit at the rectifier inputs in response to receiving an activation signal; a fault circuit electrically connected to the switch, wherein the fault circuit generates the activation signal in response to detecting at least one of an over voltage, an over temperature, and an over current condition of the driver circuit; and a charge pump circuit for providing substantially constant DC current to the fault circuit, wherein the charge pump circuit includes a first capacitor and a zener diode, wherein the first capacitor limits current to the zener diode and the zener diode limits a voltage provided to the fault circuit. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A lighting system, comprising:
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a fluorescent ballast; a light emitting diode (LED) tube light; and a driver circuit for powering the LED tube light, the driver circuit comprising; an input for connection to the fluorescent ballast; a rectifier for converting AC power received from the input into DC power, the rectifier including a rectifier input; a switch electrically connected to the rectifier input, wherein the switch is activated to create a short circuit at the rectifier inputs in response to receiving an activation signal; a fault circuit electrically connected to the switch, wherein the fault circuit generates the activation signal in response to detecting at least one of an over voltage, an over temperature, and an over current condition of the driver circuit; a charge pump circuit for providing substantially constant DC current to the fault circuit; and a reference voltage circuit generating a reference voltage, wherein the reference voltage is used by the fault circuit as a reference value to determine the over voltage, the over temperature, and the over current condition of the driver circuit. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A driver circuit for powering a load, comprising:
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an input for connection to a ballast; a rectifier for converting AC power received from the input into DC power, the rectifier including a rectifier input; a switch electrically connected to the rectifier input, wherein the switch is activated to create a short circuit at the rectifier inputs in response to receiving an activation signal; a fault circuit electrically connected to the switch, wherein the fault circuit generates the activation signal in response to detecting at least one of an over voltage, an over temperature, and an over current condition of the driver circuit; and a reference voltage circuit generating a reference voltage, wherein the reference voltage is used by the fault circuit as a reference value to determine the over voltage, the over temperature, and the over current condition of the driver circuit. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification