LED tube adapted for use with electronic ballast
First Claim
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1. An LED tube adapted for use with an electronic ballast, comprising:
- a lossless filament simulation circuit including;
a first and a second output terminals;
a first to a fourth capacitors; and
a first to a fourth resistors, wherein the electronic ballast has a first to a fourth ballast terminals, the first capacitor and the first resistor are electrically connected in parallel between the first ballast terminal and the first output terminal, the second capacitor and the second resistor are electrically connected in parallel between the first output terminal and the second ballast terminal, the third capacitor and the third resistor are electrically connected in parallel between the third ballast terminal and the second output terminal, and the fourth capacitor and the fourth resistor are electrically connected in parallel between the second output terminal and the fourth ballast terminal;
a bridge rectifier having a first and a second input terminals and a first and a second output terminals;
a current-limiting inductor electrically connected between the first output terminal of the lossless filament simulation circuit and the first input terminal of the bridge rectifier for limiting a current flowing through the electronic ballast;
a high-voltage prevention and isolation circuit having a fifth capacitor and a fifth resistor directly electrically connected in parallel between the second input terminal of the bridge rectifier and the second output terminal of the lossless filament simulation circuit, and producing a high impedance at low frequency to prevent the LED tube from a break-down phenomenon and/or a flash-over phenomenon when a withstanding high voltage test is performed;
an LED module circuit having a first and a second input terminals, wherein the first input terminal of the LED module circuit is electrically connected to the first output terminal of the bridge rectifier; and
a human body-leakage current isolation and high-voltage startup simulation circuit including a thyristor element and electrically connected between the second input terminal of the LED module circuit and the second output terminal of the bridge rectifier, wherein the thyristor element prevents an input voltage of the LED tube from becoming conductive before reaching a breakdown voltage of the thyristor element, protects the LED tube from burning out when mistakenly connected to one of an AC mains and the electronic ballast, and prevents a generation of a human body-leakage current when a 500 VAC AC mains frequency voltage test is performed.
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Abstract
An LED tube adapted for use with an electronic ballast is disclosed. The proposed LED tube includes a lossless filament simulation circuit having a first and a second output terminals and free from generating a power loss when the LED tube operated normally, wherein the lossless filament simulation circuit is electrically connected to the electronic ballast, and a bridge rectifier having a first and a second input terminals coupled to the first and the second output terminals respectively.
8 Citations
10 Claims
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1. An LED tube adapted for use with an electronic ballast, comprising:
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a lossless filament simulation circuit including; a first and a second output terminals; a first to a fourth capacitors; and a first to a fourth resistors, wherein the electronic ballast has a first to a fourth ballast terminals, the first capacitor and the first resistor are electrically connected in parallel between the first ballast terminal and the first output terminal, the second capacitor and the second resistor are electrically connected in parallel between the first output terminal and the second ballast terminal, the third capacitor and the third resistor are electrically connected in parallel between the third ballast terminal and the second output terminal, and the fourth capacitor and the fourth resistor are electrically connected in parallel between the second output terminal and the fourth ballast terminal; a bridge rectifier having a first and a second input terminals and a first and a second output terminals; a current-limiting inductor electrically connected between the first output terminal of the lossless filament simulation circuit and the first input terminal of the bridge rectifier for limiting a current flowing through the electronic ballast; a high-voltage prevention and isolation circuit having a fifth capacitor and a fifth resistor directly electrically connected in parallel between the second input terminal of the bridge rectifier and the second output terminal of the lossless filament simulation circuit, and producing a high impedance at low frequency to prevent the LED tube from a break-down phenomenon and/or a flash-over phenomenon when a withstanding high voltage test is performed; an LED module circuit having a first and a second input terminals, wherein the first input terminal of the LED module circuit is electrically connected to the first output terminal of the bridge rectifier; and a human body-leakage current isolation and high-voltage startup simulation circuit including a thyristor element and electrically connected between the second input terminal of the LED module circuit and the second output terminal of the bridge rectifier, wherein the thyristor element prevents an input voltage of the LED tube from becoming conductive before reaching a breakdown voltage of the thyristor element, protects the LED tube from burning out when mistakenly connected to one of an AC mains and the electronic ballast, and prevents a generation of a human body-leakage current when a 500 VAC AC mains frequency voltage test is performed. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An LED tube adapted for use with an electronic ballast, comprising:
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a lossless filament simulation circuit including a first and a second output terminals electrically connected to the electronic ballast; a bridge rectifier having a first and a second input terminals, and a first and a second output terminals, wherein the first input terminal is coupled to the first output terminal of the lossless filament simulation circuit; a high-voltage prevention and isolation circuit having a capacitor and a resistor directly electrically connected in parallel between the second input terminal of the bridge rectifier and the second output terminal of the lossless filament simulation circuit, and producing a high impedance at low frequency to prevent the LED tube from a break-down phenomenon and/or a flash-over phenomenon when a withstanding high voltage test is performed; an LED module circuit having a first and a second input terminals, wherein the first input terminal of the LED module circuit is electrically connected to the first output terminal of the bridge rectifier; and a human body-leakage current isolation and high-voltage startup simulation circuit including a thyristor element and electrically connected between the second input terminal of the LED module circuit and the second output terminal of the bridge rectifier, wherein the thyristor element prevents an input voltage of the LED tube from becoming conductive before reaching a breakdown voltage of the thyristor element, protects the LED tube from burning out when mistakenly connected to one of an AC mains and the electronic ballast, and prevents a generation of a human body-leakage current when a 500 VAC AC mains frequency voltage test is performed. - View Dependent Claims (8)
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9. An LED tube adapted for use with a self-oscillating electronic ballast, comprising:
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a lossless filament simulation circuit electrically connected to the electronic ballast and including a first and a second output terminals; a bridge rectifier including a first and a second input terminals, and a first and a second output terminals; and a current-limiting inductor electrically connected between the first output terminal of the lossless filament simulation circuit and the first input terminal of the bridge rectifier, and limiting a current flowing through the self-oscillating electronic ballast; a high-voltage prevention and isolation circuit having a capacitor and a resistor directly electrically connected in parallel between the second input terminal of the bridge rectifier and the second output terminal of the lossless filament simulation circuit, and producing a high impedance at low frequency to prevent the LED tube from a break-down phenomenon and/or a flash-over phenomenon when a withstanding high voltage test is performed; an LED module circuit having a first and a second input terminals, wherein the first input terminal of the LED module circuit is electrically connected to the first output terminal of the bridge rectifier; and a human body-leakage current isolation and high-voltage startup simulation circuit including a thyristor element and electrically connected between the second input terminal of the LED module circuit and the second output terminal of the bridge rectifier, wherein the thyristor element prevents an input voltage of the LED tube from becoming conductive before reaching a breakdown voltage of the thyristor element, protects the LED tube from burning out when mistakenly connected to one of an AC mains and the electronic ballast, and prevents a generation of a human body-leakage current when a 500 VAC AC mains frequency voltage test is performed. - View Dependent Claims (10)
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Specification