Speed regulation driving integrated circuit for single-phase brushless direct current fan
A technology for driving integrated circuits and DC fans. It is applied in the direction of emergency protection circuit devices, electrical components, excitation or armature current control, etc. It can solve the problems of expensive chips, power consumption, and large power consumption, and achieve increased monitoring and protection. Functionality, cost reduction, and high reliability effects
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[0045] Please refer to figure 1 , figure 1 It is a design block diagram of the entire integrated circuit. This embodiment provides an adjustable-speed single-phase brushless DC fan drive integrated circuit, which includes: an output power drive circuit for driving the fan; a logic controller to control the An output power drive circuit; a sawtooth wave generator, used to generate a sawtooth wave signal; a pulse width modulator, which compares an externally input temperature detection signal, a set minimum speed signal and the sawtooth wave signal to generate a pulse A wide modulation signal is provided to the logic controller; a hysteresis comparator, which amplifies the Hall sensor signal input from the outside, and transmits it to the logic controller to provide a commutation signal; and a stall detection and The automatic restart module has an input end connected to the logic controller, and an output end connected to the input end of the minimum speed setting signal.
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