Linear drive circuit and led light having the same

A linear drive circuit for an LED light, comprising:

• an AC-DC module configured to obtain an AC input voltage control signal, and convert the AC input voltage control signal into a DC voltage control signal;
• an LED module comprising at least two LED strings with different CCTs, and electrically connected to the AC-DC module through a first unidirectional conductive element;
• a CCT and brightness control module electrically connected to the LED module, and configured to obtain a CCT control signal or a brightness control signal according to the DC voltage control signal, and adjust a CCT of each of the at least two LED strings in the LED module according to the CCT control signal;
• and
• a drive control module electrically connected to the AC-DC module, and to the CCT and brightness control module through a second unidirectional conductive element, and configured to receive the brightness control signal from the CCT and brightness control module, and adjust brightness of the LED module according to the brightness control signal;
• wherein the CCT control signal comprises at least two PWM control signals, and the CCT and brightness control module comprises:
• a signal detection unit;
• and
• a switch control unit;
• wherein the signal detection unit is electrically connected to the AC-DC module and is configured to detect the DC voltage control signal and generate a control voltage detection signal;
• the switch control unit is electrically connected to the LED module, a first control unit, and the drive control module, respectively;
• the first control unit is respectively electrically connected to the signal detection unit and the switch control unit, and is configured to receive the control voltage detection signal sent from the signal detection unit, generate a CCT control signal according to the control voltage detection signal, and send each of the at least two PWM control signals to the switch control unit to adjust a current of each of the at least two LED strings, so that a CCT of the LED module is adjusted to a preset CCT;
• and
• the first control unit is further configured to adjust a duty cycle of the CCT control signal, so that the switch control unit outputs a brightness control signal, and sends the brightness control signal to the drive control module through the second unidirectional conductive element.