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

CN102594234BActive Publication Date: 2015-02-18DALIAN LIANSHUN ELECTRONICS +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-02-18

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Abstract

The invention relates to the field of integrated circuits, in particular to a speed regulation driving integrated circuit for a single-phase brushless direct current fan. An acquired temperature signal and an internal sawtooth generator signal are controlled through a pulse width modulator to realize automatic speed regulation. A reversing function is realized through the processing of a Hall amplifier and a logic controller according to a Hall sensor signal. A locking alarming function, a locked-rotor protection function and an automatic restarting function are realized by utilizing an internal locked-rotor detection and automatic restarting circuit. According to the integrated circuit, an automatic speed regulation function is realized, the auxiliary functions of rotating speed detection, locking alarming, locked-rotor protection, automatic restarting and the like are also realized, the complexity of a peripheral circuit is lowered, peripheral devices are reduced, and cost in the speed regulation of the fan is greatly decreased.
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Description

technical field

[0001] The invention relates to the field of integrated circuits, in particular to an adjustable-speed single-phase brushless DC fan driving integrated circuit. Background technique

[0002] With the advancement of science and technology and the continuous improvement of human requirements for quality of life, the performance of electronic products has been continuously improved. The improvement of the performance of most electronic products is accompanied by the generation of high power consumption, corresponding to the relatively high heat generated, which cannot be dissipated by itself, and can only be forced to increase the fan to dissipate heat.

[0003] The power consumption generated by electronic products is generally determined by the workload, so the heat generated by itself is not fixed. The corresponding cooling fan can adjust the fan speed according to the temperature to be radiated, which can effectively reduce power consumption and noise. ...

Examples

Embodiment Construction

[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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