US 2017/0303353 A1 · LED TUBE DRIVER CIRCUITRY FOR BALLAST AND NON-BALLAST FLUORESCENT TUBE REPLACEMENT

Abstract

An LED lamp tube and driver circuit that is direct replacement for fluorescent tubes with or without ballasts, that works with standard AC high voltage current input, with high frequency pulse current input, or with lower voltage input. The tube is wired to receive the current that is input from any two electrode pins from among the pairs of pins at the ends of the tube, which house the driver circuitry. The input current is converted to DC through a rectifier circuit, is filtered of unwanted frequencies and voltage through a filter circuit, and is controlled with a step-down constant current circuit to drive an LED array within the tube. The circuits comprise current loops having at least one current transformer, at least one transistor, capacitors, inductors, and resistors and interacting with an integrated circuit.

Claims40

Dependent claims

An LED driver circuit for fluorescent tube replacement comprising:

a) a tube for enclosing an LED light source, the tube having a first end cap and a second end cap, each of the first and second end caps having respectively a first pair of electrode pins and a second pair of electrode pins;
b) a rectifier circuit comprising a first rectifier sub-circuit connected to the first pair of electrode pins and a second rectifier sub-circuit connected to the second pair of the electrode pins, each rectifier circuit having at least a first input diode and a second input diode, each of the input diodes having an input lead connected to one of the electrode pins, and the input diodes having output leads that are connected to provide DC output from the rectifier circuit;
in which DC output from the rectifier circuit is conducted to a constant current circuit that converts the DC output from the rectifier circuit into constant DC output for driving the LED light source.

An LED driver circuit for fluorescent tube replacement comprising:

a) a tube for enclosing an LED light source, the tube having a first end cap and a second end cap, each of the first and second end caps having a pair of electrode pins;
b) each of the pairs of electrode pins being wired to a respective first rectifier circuit and a second rectifier circuit;
c) each of the first rectifier circuit and the second rectifier circuit having a pair of input diodes, each input diode having an input side that is wired to one of the electrode pins;
d) a first input capacitor connecting a first electrode pin connected to a first input diode in the first rectifier circuit to a first electrode pin connected to a first input diode in the second rectifier circuit, and a second input capacitor connecting a second electrode pin connected to a second input diode in the first rectifier circuit to a second electrode pin connection to a second input diode in the second rectifier circuit;
e) each input diode having an output lead, the output leads being connected to provide a combined DC output from the first rectifier circuit and the second rectifier circuit;
in which DC output from the rectifier circuit is conducted to filter circuit that filters to ground unwanted frequencies of electrical current and filters to ground harmful surges in voltage and in which filter circuit output is conducted to a step-down constant current circuit that converts the DC output from the rectifier circuit into constant DC output for driving the LED light source.

3 more elements

Dependencies are inferred from the claim text.

Led tube driver circuitry for ballast and non-ballast fluorescent tube replacement

Life of this patent

Led tube driver circuitry for ballast and non-ballast fluorescent tube replacement

Life of this patent

Abstract

Claims40