LED tube lamp and a power supply module thereof
A light-emitting diode (LED) tube lamp comprising a tube, end caps with contact pins and located on both ends of the tube, a first rectifying circuit and a second rectifying circuit and a filtering circuit that are coupled with the contact pins on the two end caps respectively, and a switch circuitry that is located between the rectifying circuits and the filtering circuit characterized in that the switch circuitry is capable of detecting whether the LED tube lamp is correctly installed on a lamp socket so as to reduce the risk of electric shock.
1. An LED tube with a safety device, connected with an external power supply, 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 with the pins of both conductive pin groups;
a plurality of fuses connected to the conductive pin groups, respectively; and
a rectifier electrically connected with the pins of both conductive pin groups,
wherein the safety device comprises:
a leakage detecting module connecting with the external power supply; and
a driving module comprising a Type A+B driving circuit and being electrically connected with the leakage detecting module, and having a current-limiting control unit;
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.
2. The LED tube with the saftey device according to claim 1 , 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.
3. The LED tube with the safety device according to claim 2 , wherein the base is a portion of the LED tube where electronic components of the LED tube are formed.
4. An electric leakage protection circuit, comprising:
a leakage detecting module connecting with a power supply;
a driving module comprising a Type A+B driving circuit and being electrically connected with the leakage 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,
wherein the leakage detecting module includes a rectifying circuit connected to the power supply, and
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 the rectifying circuit, and configured to detect a frequency of the 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.
5. The electric leakage protection circuit as claimed in claim 4 , wherein the detected signal indicates the mode switching circuit performs the first driving mode when the frequency of the signal output from the power supply is a first frequency, and indicates the mode switching circuit performs the second driving mode when the frequency of the signal output from the power supply is a second frequency, wherein the first frequency is lower than the second frequency.
6. A lamp comprising:
a body connecting with a power supply;
a leakage detecting module arranged in the body and connected with the power supply;
a light-emitting module being arranged in the body;
a driving module comprising a Type A+B driving circuit and being electrically connected with the leakage detecting module, and having a current-limiting control unit being set in a Type A circuit included in the Type A+B driving circuit of the driving module to limit the current and being electrically connected with the leakage detecting module;
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 output current of the power supply.
7. The lamp as claimed in claim 6 , wherein the light-emitting module is an LED light emitting module.
8. The lamp as claimed in claim 6 , wherein the Type A circuit comprises a ballast interface circuit electrically connected to a rectifier and comprising:
a first resistor, having one end electrically connected to the rectifier;
a second resistor, having one end electrically connected to the other end of the first resistor, and the other end electrically connected to a ground level;
a control circuit, electrically connected to a connection node of the first and the second resistors to receive a detection signal; and
a switch, having a control end electrically connected to the control circuit and configured to turn on/off based on the control of the control circuit,
wherein when the control circuit determines the detection signal exceeds the reference signal, the control circuit controls the switch to be cut off in order to limit the output current of the power supply.