The invention provides a PTC
assembly with alarming and automatic
air volume adjusting functions. The PTC
assembly is characterized in that a PTC core body, a fan, a direct-current
contactor, a direct-current
relay and a
temperature control switch are arranged in a shell, the contacts of the direct-current
relay are respectively connected with a first power supply and the fan, the PTC
control signal output end of an air conditioner controller is connected with the coil input ends of the direct-current
relay and the direct-current
contactor, the coil output ends of the direct-current relay andthe direct-current
contactor are jointly connected to the negative
electrode of the fan, the PWM speed regulation
signal output end of an automobile air conditioner is connected with the PWM
signal receiving end of the fan, the contact of the direct-current contactor is connected with the positive
electrode of a second power supply and one end of the PTC core body, the other end of the PTC core body is connected with the negative
electrode of the second power supply, one end of the
temperature control switch is connected with the PTC detection wire inlet end of the air conditioner controller,and the other end of the
temperature control switch is grounded. The PTC
assembly has the alarm and
air volume automatic regulation functions, and PTC
air volume stepless speed regulation and over-temperature alarm are achieved.