A LED driver circuit, comprising: a first voltage drop module for connecting to a power source, and configured to convert a direct current voltage; a constant current driving module, connected to the first voltage drop module, and configured to receive the converted direct current voltage to drive a loading module; an auxiliary winding module, connected to the first voltage drop module and the constant current driving module, and configured to receive the converted direct current voltage and to correspondingly output an actual voltage level; characterized in that the LED driver circuit further comprises: a second voltage drop module, connected to the first voltage drop module, and configured to buck the converted direct current voltage and to correspondingly output a bucked voltage; a DIP switch module, connected to the second voltage drop module, and configured to receive the bucked voltage for powering the DIP switch module, to select a predetermined current level, and to output an electrical signal; and a control module, connected to the DIP switch module, the second voltage drop module, the auxiliary winding module and the constant current driving module, wherein said control module is arranged to receive said electrical signal, the bucked voltage for powering the control module, and to identify the current level set by the DIP switch module and output a corresponding pulse signal that corresponds to the electrical signal, said pulse signal for controlling the constant current driving module, and said control module is configured to calculate a required voltage level and to determine a working status of the loading module based on a voltage level relationship between the required voltage level and the actual voltage level; wherein said control module is configured to determine that the working status of the loading module is under a normal working status, when the actual voltage level is lower than the required voltage level, and to determine that the working status of the loading module is a pause working status, when the actual voltage level is higher than the required voltage level. a first voltage drop module for connecting to a power source, and configured to convert a direct current voltage; a constant current driving module, connected to the first voltage drop module, and configured to receive the converted direct current voltage to drive a loading module; an auxiliary winding module, connected to the first voltage drop module and the constant current driving module, and configured to receive the converted direct current voltage and to correspondingly output an actual voltage level; characterized in that the LED driver circuit further comprises: a second voltage drop module, connected to the first voltage drop module, and configured to buck the converted direct current voltage and to correspondingly output a bucked voltage; a DIP switch module, connected to the second voltage drop module, and configured to receive the bucked voltage for powering the DIP switch module, to select a predetermined current level, and to output an electrical signal; and a control module, connected to the DIP switch module, the second voltage drop module, the auxiliary winding module and the constant current driving module, wherein said control module is arranged to receive said electrical signal, the bucked voltage for powering the control module, and to identify the current level set by the DIP switch module and output a corresponding pulse signal that corresponds to the electrical signal, said pulse signal for controlling the constant current driving module, and said control module is configured to calculate a required voltage level and to determine a working status of the loading module based on a voltage level relationship between the required voltage level and the actual voltage level; wherein said control module is configured to determine that the working status of the loading module is under a normal working status, when the actual voltage level is lower than the required voltage level, and to determine that the working status of the loading module is a pause working status, when the actual voltage level is higher than the required voltage level.