Power source module for LED lamp

Patent metadata

Field	Value
Publication number	US-9480109-B2
Application number	US-201514699138-A
Country	US
Kind code	B2
Filing date	Apr 29, 2015
Priority date	Oct 14, 2014
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A power source module for a LED lamp includes a filament-simulating circuit, a current limiting circuit, a rectifier, a filter, and a discharging circuit electrically connected to each other and a LED in the LED lamp. The filament-simulating circuit simulates a filament before the LED to pass through the pre-heating process of the electrical ballast in a fluorescent lamp base. The current limiting circuit, the rectifier, and the filter limit, rectify and filter the current from an external power source in the fluorescent lamp base to output a high frequency, direct current to drive the LED. The discharging circuit discharges the energy after turning the power switch off to prevent the LED lamp from flicker. Therefore, the power source module enables the LED lamp to be installed on the traditional fluorescent lamp base without modifying the circuit in the base.

First claim

The invention claimed is:

1. A power source module for a LED lamp comprising:
a current limiting circuit, electrically connected to a first bi-pin terminal of the LED lamp for limiting a current from the terminal, the current limiting circuit comprising:
a first capacitance, one end of the first capacitance being electrically connected to one pin of the first bi-pin terminal;
a second capacitance, one end of the second capacitance being electrically connected to the other pin of the first bi-pin terminal, and the other end of the second capacitance being electrically connected to the other end of the first capacitance; and
a third capacitance, one end of the third capacitance being electrically connected to the other ends of the first capacitance and the second capacitance;

a first rectifier, electrically connected to the current limiting circuit for rectifying the current from the current limiting circuit; and
a filter, electrically connected between the first rectifier and at least one LED of the LED lamp for smoothing the current from the first rectifier.

2. A power source module for a LED lamp comprising:
a current limiting circuit, electrically connected to a first bi-pin terminal of the LED lamp for limiting a current from the bi-pin terminal, the current limiting circuit comprising:
a first capacitance, one end of the first capacitance being electrically connected to one pin of the first bi-pin terminal; and
a second capacitance, one end of the second capacitance being electrically connected to the other pin of the first bi-pin terminal, and the other end of the second capacitance being electrically connected to the other end of the first capacitance;

a first rectifier, electrically connected to the current limiting circuit, for rectifying the current from the current limiting circuit; and
a filter, electrically connected between the first rectifier and at least one LED of the LED lamp for smoothing the current from the first rectifier;

wherein the first rectifier comprises two diodes electrically connected in series and the connection node of the two diodes is electrically connected to the other ends of the first and second capacitances.

3. The power source module of claim 1 , further comprising a discharging circuit, electrically connected to the filter in parallel for discharging the filter.

4. A power source module for a LED lamp comprising:
a current limiting circuit, electrically connected to a first bi-pin terminal of the LED lamp for limiting a current from the bi-pin terminal, the current limiting circuit comprising:
a first capacitance, one end of the first capacitance being electrically connected to one pin of the first bi-pin terminal; and
a second capacitance, one end of the second capacitance being electrically connected to the other pin of the first bi-pin terminal, and the other end of the second capacitance being electrically connected to the other end of the first capacitance;

a first rectifier, electrically connected to the current limiting circuit, for rectifying the current from the current limiting circuit;
a filter, electrically connected between the first rectifier and at least one LED of the LED lamp for smoothing the current from the first rectifier; and
a filament-simulating circuit, electrically connected to the first and a second bi-pin terminals of the LED lamp, each of the first and the second bi-pin terminals having a current flowing from one pin to the other pin of the respective bi-pin terminal via the filament-simulating circuit during a pre-heat process executed by the ballast of the fluorescent lamp base.

5. The power source module of claim 4 , wherein the filament-simulating circuit comprises:
a first filament-simulating circuit, comprising a first capacitance element electrically connected between two pins of the first bi-pin terminal; and
a second filament-simulating circuit, comprising a second capacitance element electrically connected between two pins of the second bi-pin terminal.

6. The power source module of claim 5 , wherein:
the first filament-simulating circuit further comprises a first pair of resistances electrically connected in series, the first capacitance element comprises a first pair of capacitances electrically connected in series, the first pair of resistances and the first pair of capacitances electrically connected in parallel between two pins of the first bi-pin terminal, and the connection point between the first pair of resistances being electrically connected to the connection point between the first pair of capacitances; and
the second filament-simulating circuit further comprises a second pair of resistances electrically connected in series, the second capacitance element comprises a second pair of capacitances electrically connected in series, the second pair of resistances and the second pair of capacitances electrically connected in parallel between two pins of the second bi-pin terminal, and the connection point between the second pair of resistances being electrically connected to the connection point between the second pair of capacitances.

7. The power source module of claim 6 , wherein an impedance of the first pair of resistances is ten times more than that of the first pair of capacitances, and an impedance of the second pair of resistances is ten times more than that of the second pair of capacitances.

8. The power source module of claim 5 , wherein the first rectifier comprises two diodes electrically connected in series, and the first rectifier is electrically connected with the first filament-simulating circuit in parallel.

9. The power source module of claim 5 , wherein the first rectifier comprises two diodes electrically connected in series and the connection node of the two diodes is coupled to the current limiting circuit, wherein a current flows from the at least one LED to one pin of the first bi-pin terminal through one of the two diodes and the current limiting circuit, or from one pin of the first bi-pin terminal to the at least one LED through the other of the two diodes and the current limiting circuit.

10. The power source module of claim 9 , wherein the current limiting circuit comprises at least a capacitance.

11. The power source module of claim 8 , further comprising a second rectifier, wherein the second rectifier is a bridge rectifier electrically connected with the second filament-simulating circuit in parallel.

12. The power source module of claim 1 , wherein the filter comprises a filtering capacitance electrically connected with the at least one LED.

13. The power source module of claim 4 , wherein the power source module is configured inside a casing of the LED lamp.

14. The power source module of claim 4 , further comprising a discharging circuit, electrically connected to the filter in parallel for discharging the filter.

15. The power source module of claim 1 , further comprising a discharging circuit electrically connected to the filter in parallel for discharging the filter.

16. The power source module of claim 1 , further comprising a filament-simulating circuit, electrically connected to the first bi-pin terminal and a second bi-pin terminal of the LED lamp, each of the first and the second bi-pin terminals having a current flowing from one pin to the other pin of the respective bi-pin terminal via the filament-simulating circuit during a pre-heat process executed by the ballast of the fluorescent lamp base.

17. The power source module of claim 16 , wherein the filament-simulating circuit comprises:
a first filament-simulating circu

Assignees

• Jiaxing Super Lighting Electric Appliance Co Ltd
• Shanghai Lumixess Tech Co Ltd
• Jiaxing Super Lighting Electric Appliance Co Lti

Inventors

• Ye Qi Feng
• Jiang Tao
• Zhang Yue-Qiang
• Chen Zhong

Classifications

• F21K9/27

  Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes · CPC title

• H05B45/395 Primary

  Linear regulators · CPC title

• F21V23/009

  the casing being inside the housing of the lighting device · CPC title

• F21V23/023

  Power supplies in a casing (F21V23/003 takes precedence) · CPC title

• F21K9/278

  Arrangement or mounting of circuit elements integrated in the light source · CPC title