LED tube lamp and a power supply module thereof
A light-emitting diode (LED) tube lamp and an electric leakage protection circuit are provided. The LED tube lamp. The LED tube lamp includes a leakage detecting module and a driving module comprising a Type A+B driving circuit. The leakage detecting module is connected with a power supply. The driving module is electrically connected with the leakage detecting module. The leakage detecting module detects a signal related to the output current of the power supply, and when the signal related to the output current of the power supply exceeds a reference signal, the leakage detecting module limits the current on a power loop connected to the power supply by periodically turning off a switch electrically connected to the power loop in series.
1. An LED tube lamp, comprising:
a detecting module connecting with a power supply; and
a driving module comprising a Type A+B driving circuit and being electrically connected to the leakage-detecting module;
wherein the detecting module detects a signal related to the output current of the power supply, and when the signal related to the output current of the power supply exceeds a reference signal, the detecting module limits the current on a power loop connected to the power supply by periodically turning off a switch electrically connected to the power loop in series, and
wherein a Type A+B driving circuit is a driving circuit configured to receive a high frequency input from a ballast and to receive a low frequency AC signal input and to selectively drive the LED tube lamp according to different modes based on the received input.
2. The LED tube lamp as claimed in claim 1 , wherein the Type A+B driving circuit comprises:
a DC-to-DC converter circuit;
a mode switching circuit, electrically connected to the DC-to-DC converter circuit, configured to determine whether to perform a first driving mode or a second driving mode based on a detected signal; and
a mode determining circuit, electrically connected to the mode switching circuit and a rectifying circuit, and configured to detect a frequency of a signal output from the power supply and generate the detected signal,
wherein at least a component of the DC-to-DC converter circuit is bypassed when the mode switching circuit performs the second driving mode.
3. The LED tube lamp as claimed in claim 1 , further comprising:
two conductive pin groups, each of the conductive pin groups including two pins;
at least a first LED light-emitting component configured to be electrically connected to the two pins of each of the conductive pin groups;
a plurality of fuses directly connected to the conductive pin groups, respectively; and
an electronic rectifier electrically connected to the two pins of each of the conductive pin groups.
4. The LED tube lamp as claimed in claim 1 , wherein the detecting module detects an impedance of the power loop by sending a pulse to determine whether to limit the current on the power loop.
5. An electric protection circuit, comprising:
a detecting module connecting to a power supply; and
a driving module comprising a Type A+B driving circuit and being electrically connected to the detecting module, and having a current-limiting control unit;
wherein the current-limiting control unit detects the output current of the power supply, and when the current-limiting control unit detects the output current of the power supply exceeding a reference signal, the current-limiting control unit limits the current on a power loop connected to the power supply, and
wherein a Type A+B driving circuit is a driving circuit configured to receive a high frequency input from a ballast and to receive a low frequency AC signal input and to selectively drive the LED tube lamp according to different modes based on the received input.
6. The electric protection circuit as claimed in claim 5 , wherein the detecting module includes a rectifier configured to connect to a power supply.
7. An LED tube with a safety device, the LED tube configured to be connected to an external power supply and comprising:
two conductive pin groups, each of the conductive pin groups including two pins;
at least an LED light-emitting component configured to be electrically connected to the two pins of both conductive pin groups;
a plurality of fuses connected to the conductive pin groups, respectively; and
a rectifier electrically connected to the pins of both conductive pin groups,
wherein the safety device comprises:
a detecting module configured to connect to the external power supply; and
a driving module comprising a Type A+B driving circuit and being electrically connected to the detecting module, and having a current-limiting control unit, wherein the Type A+B driving circuit is a driving circuit configured to receive a high frequency input above a threshold and to receive a low frequency input below the threshold, and the driving module is configured to selectively drive the LED tube lamp according to different modes based on the received input;
wherein the current-limiting control unit detects the output current of the external power supply, and when the current-limiting control unit detects the output current of the external power supply exceeding a reference signal, the current-limiting control unit limits the current on a power loop connected to the external power supply,
wherein at least a component of the Type A+B driving circuit is bypassed to make the component unable to transfer and/or convert power when the pins of the LED tube receive an external driving signal having a frequency more than 20 KHz.
8. The LED tube with the safety device according to claim 7 , wherein the LED tube further includes a base; the conductive pin groups, a fuse, and the LED light-emitting component are configured at the base; and a lamp cover covers the LED light-emitting component.
9. The LED tube with the safety device according to claim 8 , wherein the base is a portion of the LED tube where electronic components of the LED tube are formed.