Ballast stabilizer-compatible lamp having leakage current protection circuit

Patent metadata

Field	Value
Publication number	US-9839081-B2
Application number	US-201615263541-A
Country	US
Kind code	B2
Filing date	Sep 13, 2016
Priority date	Sep 14, 2015
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A ballast stabilizer-compatible lamp including a leakage current protection circuit includes a first input stage configured to receive first external power, a second input stage configured to receive second external power, a first switch module electrically connected to the first input stage and configured to switch on/off depending on a predetermined condition, a second switch module electrically connected to the second input stage and configured to switch on/off depending on a predetermined condition, an overvoltage protection circuit electrically connected to the first switch module and the second switch module and configured to prevent an overvoltage, a control module electrically connected to the overvoltage protection circuit and configured to sense and control the state of the first switch module, the first switch module, and the overvoltage protection circuit, and a light source electrically connected to the control module and configured to radiate light when power is applied.

First claim

What is claimed is:

1. A ballast stabilizer-compatible lamp comprising a leakage current protection circuit, the ballast stabilizer-compatible lamp comprising:
a first input stage configured to receive first external power;
a second input stage configured to receive second external power;
a first switch module electrically connected to the first input stage and configured to switch on/off depending on a predetermined condition;
a second switch module electrically connected to the second input stage and configured to switch on/off depending on a predetermined condition;
an overvoltage protection circuit electrically connected to the first switch module and the second switch module and configured to prevent an overvoltage;
a control module electrically connected to the overvoltage protection circuit and configured to sense the state of the first switch module, the second switch module and the overvoltage protection circuit, and to control the first switch module, the second switch module and the overvoltage protection circuit; and
a light source electrically connected to the control module and configured to radiate light when power is applied,
wherein the first switch module or the second switch module comprises:
a reverse bias diode configured to block a current in an opposite direction if the switch module is an off state;
a TVS (transient voltage suppression) diode configured to operate when a predetermined voltage or more is applied;
a protection resistor configured to prevent damage to the TVS diode;
a switch element configured to switch on/off depending on a predetermined condition; and
a capacitor configured to perform noise filtering.

2. The ballast stabilizer-compatible lamp of claim 1 , wherein commercial power is converted into the predetermined first external power and second external power in a ballast stabilizer and inputted to the first input stage or the second input stage.

3. The ballast stabilizer-compatible lamp of claim 1 , further comprising:
a first rectification circuit configured to rectify the first external power received from the first input stage and apply the rectified power to the first switch module; and
a second rectification circuit configured to rectify the second external power received from the second input stage and apply the rectified power to the second switch module.

4. The ballast stabilizer-compatible lamp of claim 3 , wherein the first rectification circuit or the second rectification circuit is a bridge diode.

5. The ballast stabilizer-compatible lamp of claim 1 , wherein the switch element comprises a thyristor (SCR) or an FET.

6. The ballast stabilizer-compatible lamp of claim 1 , wherein the switch element switches on/off in response to a size of a voltage applied to the switch element.

7. The ballast stabilizer-compatible lamp of claim 1 , wherein the TVS diode operates when a voltage applied to the TVS diode is 54 V or higher.

8. The ballast stabilizer-compatible lamp of claim 1 , wherein an output stage of the first switch module and an output stage of the second switch module are electrically connected.

9. The ballast stabilizer-compatible lamp of claim 1 , wherein if the first external power is normally received and the second external power is an off state, the first switch module is an on state and the second switch module is an off state.

10. The ballast stabilizer-compatible lamp of claim 1 , wherein if the first external power is an off state and the second external power is normally received, the first switch module is an off state and the second switch module is an on state.

11. The ballast stabilizer-compatible lamp of claim 1 , wherein the light source comprises an LED.

12. The ballast stabilizer-compatible lamp of claim 1 , wherein the ballast stabilizer-compatible lamp is a tube type lamp.

13. The ballast stabilizer-compatible lamp of claim 1 , wherein:
the first input stage further comprises a first input electrode for receiving the first external power, and
the second input stage further comprises a second input electrode for receiving the second external power.

Assignees

• Lg Innotek Co Ltd

Inventors

• Park Jong June

Classifications

• H05B47/26

  Circuit arrangements for protecting against earth faults · CPC title

• H05B47/24

  Circuit arrangements for protecting against overvoltage · CPC title

• F21K9/00 Primary

  Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers · CPC title

• H05B45/37 Primary

  Converter circuits · CPC title

• F21V25/00

  Safety devices structurally associated with lighting devices (gas- tight or water-tight arrangements F21V31/00; in general F16P; protective circuit arrangements per se H02H7/00) · CPC title