Elongated lamp tube, ballast and kit thereof
An elongated lamp tube has an elongated tube shell, two caps, a LED light source, a first power supply circuit, a second power supply circuit and a frequency switch circuit. The elongated lamp tube may be connected to first electrodes of a lamp fixture without a ballast or a lamp fixture with a ballast. The ballast converts an external power of an industrial frequency to a converted power of a working frequency. The frequency switch circuit is connected to the first power supply and the second power supply for blocking one of the first power supply circuit and the second power supply to supply driving current to the LED light source according to an input frequency of a received power.
1. A lighting apparatus, comprising:
a lighting shell having a containing space;
a LED light source for emitting light passing through a shell surface of the lighting shell;
a first power supply circuit for converting a converted power of the working frequency to a first driving current supplying to the LED light source;
a second power supply circuit for converting an external power of an industrial frequency to a second driving current to the LED light source; and
a frequency switch circuit connected to the first power supply and the second power supply for blocking one of the first power supply circuit and the second power supply to supply one of the first driving current and the second driving current to the LED light source according to an input frequency of a received power from two electrodes, wherein the first power supply circuit, and the second power supply circuit are stored in the containing space,
wherein the frequency switch circuit blocks the received power into the first power supply circuit when the input frequency of the received power is within a predetermined range of the industrial frequency, and
wherein the frequency switch circuit further comprises a voltage switch for disabling working of the second power supply circuit.
2. The lighting apparatus of claim 1 , wherein the frequency circuit has a capacitor for blocking the received power to the first power supply circuit.
3. The lighting apparatus of claim 2 , wherein the frequency switch uses a voltage switch for disabling the working of the second supply circuit.
4. The lighting apparatus of claim 1 , wherein the voltage switch is an optical coupled switch connected to the first power supply circuit enabled when the first power supply is activated by receiving the received power for sending a ground voltage to a power supply integrated chip of the second power supply circuit to disable working of the power supply integrated chip.
5. The lighting apparatus of claim 1 , further comprising a safety circuit connected for turning off the second power supply circuit by detecting an impedance of the electrodes.
6. The lighting apparatus of claim 1 , further comprising a temperature fuss for escaping the first power supply circuit and the second power supply circuit from the received power if a temperature at a temperature fuses is higher than a predetermined threshold.
7. The lighting apparatus of claim 1 , further comprising a tube detection module of resistors to be compatible with different types of ballast.
8. The lighting apparatus of claim 1 , further comprising a piezo-resistor for escaping the second power supply module from the received power when the received power is abnormal.
9. The lighting apparatus of claim 1 , wherein the first power supply circuit has a first filter circuit for further filtering a bridge current generated by a bridge circuit to generate the first driving current to the LED light source.
10. The lighting apparatus of claim 1 , wherein the first filter circuit has a capacitor and a resistor connected in parallel with the LED light source.
11. The lighting apparatus of claim 1 , wherein the second power supply circuit has a second filter circuit with a conductor, a resistor and capacitors for lowering an electro-magnetic wave of lighting apparatus.
12. The lighting apparatus of claim 1 , wherein the lighting shell comprises an elongated lamp tube compatible of replacing a fluorescent tube under Underwriters Laboratories (UL) standard.
13. The lighting apparatus of claim 1 , wherein the first power supply circuit, the second power supply circuit and the frequency switch circuit are stored in one cap located in one end of the lighting shell.
14. The lighting apparatus of claim 1 , wherein the industrial frequency is between 30 to 70 Hz.
15. The lighting apparatus of claim 1 , wherein a working frequency of a ballast working with the lighting apparatus is between 20 KHz and 100 KHz.
16. The lighting apparatus of claim 15 , wherein the ballast is an electronic ballast.
17. The lighting apparatus of claim 1 , wherein the lamp has a manual switch for enabling either the first power supply circuit or the second power supply circuit.
18. The lighting apparatus of claim 1 , wherein the tube surface is partially covered with reflected material.
19. The lighting apparatus of claim 1 , wherein the shell surface is partially covered with diffusion material.
20. The lighting apparatus of claim 1 , wherein the lighting shell is a T8 lamp tube shell size.