Hall-free small fan control circuit
The utility model belongs to the technical field of fan control circuits, in particular to a Hall-free small fan control circuit, which comprises a charging module, a main control module and a driving module, the driving module comprises a first electronic switch, a second electronic switch, a third...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The utility model belongs to the technical field of fan control circuits, in particular to a Hall-free small fan control circuit, which comprises a charging module, a main control module and a driving module, the driving module comprises a first electronic switch, a second electronic switch, a third electronic switch, a fourth electronic switch, a sampling resistor, a first power supply terminal, a grounding terminal and a sampling terminal, the first electronic switch and the third electronic switch form a group of silicon controlled switches, and the second electronic switch and the fourth electronic switch form a group of silicon controlled switches, so that the four silicon controlled switches form a full-bridge circuit, and the position of the rotor is detected through a sampling pin of the processor by utilizing a back electromotive force method to provide reference for control logic; the alternating conduction frequency of the first electronic switch and the third electronic switch and the alternating |
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