LED fluorescent lamp
View Patent ↗A light-emitting diode (LED) fluorescent lamp which can replace a typical fluorescent lamp is provided. The LED fluorescent lamp includes an LED array including a plurality of LEDs connected in series; first through fourth connection pins; first through fourth capacitors connected to the first through fourth connection pins, respectively; a first diode having an commonly connected to second ends of the first and third capacitors and a cathode connected to a first end of the LED array; a second diode having an anode connected to a second end of the LED array and a cathode commonly connected to second ends of the second and fourth capacitors. The LED fluorescent lamp can replace a typical fluorescent lamp without a requirement of the installation of additional equipment or the change of wiring.
1. A light-emitting diode (LED) fluorescent lamp comprising:
a plurality of external connection pins including a first to a fourth connection pins, wherein at least two connection pins among the first to the fourth connection pins are connected to an electronic fluorescent lamp ballast;
an LED array including a plurality of LEDs connected in series; and
a plurality of capacitors connected between the LED array and the external connection pins, the plurality of capacitors including
a first capacitor having a first end connected to the first connection pin and a second end connected to an anode terminal of the LED array,
a second capacitor having a first end connected to the second connection pin and a second end connected to a cathode terminal of the LED array,
a third capacitor having a first end connected to the third connection in and a second end connected to the anode terminal of the LED array, and
a fourth capacitor having a first end connected to the fourth connection pin and a second end connected to the cathode terminal of the LED array.
2. The LED fluorescent lamp of claim 1 , wherein the electronic fluorescent lamp ballast is a half-bridge-type fluorescent lamp ballast.
3. The LED fluorescent lamp of claim 1 , further comprising at least one of:
a first resistor connected in parallel to the first capacitor;
a second resistor connected in parallel to the second capacitor;
a third resistor connected in parallel to the third capacitor; and
a fourth resistor connected in parallel to the fourth capacitor.
4. The LED fluorescent lamp of claim 1 , further comprising:
a first diode having an anode connected to the second end of the first capacitor and the second end of the third capacitor and a cathode connected to the anode terminal of the LED array; and
a second diode having an anode connected to the cathode terminal of the LED array and a cathode connected to the second end of the second capacitor and the second end of the fourth capacitor.
5. The LED fluorescent lamp of claim 4 , further comprising at least one of:
a third diode having an anode connected to the first connection pin and a cathode connected to the anode of the first diode;
a fourth diode having a cathode connected to the second connection pin and an anode connected to the cathode of the second diode;
a fifth diode having an anode connected to the third connection pin and a cathode connected to the anode of the first diode; and
a sixth diode having a cathode connected to the fourth connection pin and an anode connected to the cathode of the second diode.
6. The LED fluorescent lamp of claim 1 , wherein the LED fluorescent lamp comprises a plurality of LED arrays connected in parallel.
7. An LED fluorescent lamp comprising:
an LED array including a plurality of LEDs connected in series;
first through fourth connection pins;
a first capacitor connected between the first connection pin and a first end of the LED array;
a second capacitor connected between the second connection pin and a second end of the LED array;
a third capacitor connected between the third connection pin and the first end of the LED array; and
a fourth capacitor connected between the fourth connection pin and the second end of the LED array.
8. The LED fluorescent lamp of claim 7 , further comprising at least one of:
a first diode connected between the first connection pin and the LED array and generating a unidirectional current path in the LED array; and
a second diode connected between the second connection pin and the LED array and generating a unidirectional current path in the LED array.
9. The LED fluorescent lamp of claim 7 , further comprising:
a third diode connected in parallel to the first capacitor and having an anode connected to the first connection pin;
a fourth diode connected in parallel to the second capacitor and having a cathode connected to the second connection pin;
a fifth diode connected in parallel to the third capacitor and having an anode connected to the third connection pin; and
a sixth diode connected in parallel to the fourth capacitor and having a cathode connected to the fourth connection pin.
10. The LED fluorescent lamp of claim 9 , further comprising:
a seventh diode having an anode connected to the anode of the fourth diode and a cathode connected to the first connection pin;
an eighth diode having an anode connected to the second connection pin and a cathode connected to the cathode of the third diode;
a ninth diode having an anode connected to the fourth connection pin and a cathode connected to the cathode of the fifth diode; and
a tenth diode having an anode connected to the anode of the sixth diode and a cathode connected to the third connection pin.
11. The LED fluorescent lamp of claim 7 , further comprising:
a first resistor connected in parallel to the first capacitor;
a second resistor connected in parallel to the second capacitor;
a third resistor connected in parallel to the third capacitor; and
a fourth resistor connected in parallel to the fourth capacitor.
12. An LED fluorescent lamp connected to an electronic fluorescent lamp ballast comprising:
an LED array including a plurality of LEDs connected in series;
first and second connection pins connected to the electronic fluorescent lamp ballast;
a first capacitor having a first end connected to the first connection pin and a second end connected to a first end of the LED array;
a second capacitor having a first end connected to the second connection pin and a second end connected to a second end of the LED array; and
one or more diodes connected between the first and second connection pins and generating a unidirectional current path in the LED array.
13. The LED fluorescent lamp of claim 12 , wherein the diodes include a first diode having an anode connected to the second end of the first capacitor and a cathode connected to an anode terminal of the LED array and a second diode having an anode connected to a cathode terminal of the LED array and a cathode connected to the second end of the second capacitor.
14. The LED fluorescent lamp of claim 13 , further comprising:
third and fourth connection pins;
a third capacitor having a first end connected to the third connection pin and a second end connected to the first end of the LED array; and
a fourth capacitor having a first end connected to the fourth connection pin and a second end connected to the second end of the LED array.
15. The LED fluorescent lamp of claim 14 , wherein the diodes further comprise
a third diode having an anode connected to the second end of the first capacitor and a cathode connected to the anode of the first diode,
a fourth diode having a cathode connected to the second end of the second capacitor and an anode connected to the cathode of the second diode,
a fifth diode having an anode connected to the second end of the third capacitor and a cathode connected to the anode of the first diode, and
a sixth diode having a cathode connected to the second end of the fourth capacitor and an anode connected to the cathode of the second diode.
16. The LED fluorescent lamp of claim 15 , wherein the diodes further comprise at least one of
a seventh diode having an anode connected to the anode of the fourth diode and a cathode connected to the second end of the first capacitor,
an eighth diode having an anode connected to the second end of the second capacitor and a cathode connected to the cathode of the third diode,
a ninth diode having an anode connected to the second end of the fourth capacitor and a cathode connected to the cathode of the fifth diode, and
a tenth diode having an anode connected to the anode of the sixth diode and a cathode connected to the second end of the third capacitor.
17. The LED fluorescent lamp of claim 12 , wherein the LED fluorescent lamp includes a plurality of LED arrays connected in parallel.
18. An LED fluorescent lamp comprising:
an LED array including a plurality of LEDs connected in series;
first through fourth connection pins;
first through fourth capacitors, each of first ends of the first through fourth capacitors connected to the first through fourth connection pins, respectively;
a first diode having an anode commonly connected to second ends of the first and third capacitors and a cathode connected to a first end of the LED array;
a second diode having an anode connected to a second end of the LED array and a cathode commonly connected to second ends of the second and fourth capacitors;
a third diode having an anode connected to the cathode of the second diode and a cathode connected to the first end of the LED array; and
a fourth diode having an anode connected to the second end of the LED array and a cathode connected to the anode of the first diode.
19. The LED fluorescent lamp of claim 18 , further comprising:
a fifth diode having an anode connected to the first connection pin and a cathode connected to the second end of the first capacitor;
a sixth diode having an anode connected to the second connection pin and a cathode connected to the second end of the second capacitor;
a seventh diode having an anode connected to the third connection pin and a cathode connected to the second end of the third capacitor; and
an eighth diode having an anode connected to the fourth connection pin and a cathode connected to the second end of the fourth capacitor.
20. The LED fluorescent lamp of claim 18 , further comprising:
a fifth diode having a cathode connected to the first connection pin and an anode connected to the second end of the first capacitor;
a sixth diode having a cathode connected to the second connection pin and an anode connected to the second end of the second capacitor;
a seventh diode having a cathode connected to the third connection pin and an anode connected to the second end of the third capacitor; and
an eighth diode having a cathode connected to the fourth connection pin and an anode connected to the second end of the fourth capacitor.
21. The LED fluorescent lamp of claim 18 , wherein the LED fluorescent lamp comprises a plurality of LED arrays connected in parallel.
22. An LED fluorescent lamp comprising:
an LED array including a plurality of LEDs connected in series;
first through fourth connection pins;
first through fourth capacitors, each of first ends of the first through fourth capacitors connected to the first through fourth connection pins, respectively;
a first diode having a cathode connected to a first end of the LED array;
a second diode having an anode connected to a second end of the LED array;
a third diode having an anode connected to a second end of the first capacitor and a cathode connected to the anode of the first diode;
a fourth diode having an anode connected to a cathode of the second diode and a cathode connected to a second end of the second capacitor;
a fifth diode having an anode connected to a second end of the third capacitor and a cathode connected to the anode of the first diode;
a sixth diode having an anode connected to the cathode of the second diode and a cathode connected to a second end of the fourth capacitor;
a seventh diode having an anode connected to the second end of the LED array and a cathode connected to the second end of the first capacitor; and
an eighth diode having an anode connected to the second end of the second capacitor and a cathode connected to the first end of the LED array.
23. The LED fluorescent lamp of claim 22 , further comprising:
a ninth diode having an anode connected to the second end of the fourth capacitor and a cathode connected to the first end of the LED array; and
a tenth diode having an anode connected to the second end of the LED array and a cathode connected to the second end of the third capacitor.
24. The LED fluorescent lamp of claim 22 , wherein the LED fluorescent lamp comprises a plurality of LED arrays connected in parallel.