Motor drive circuit, method, and cooling device using the same
A motor drive circuit and driver circuit technology, applied in the direction of excitation or armature current control, etc., can solve the problems of large induced voltage, exceeding the rated value of the driving circuit, etc., achieve high soft start control, suppress the generation of induced voltage, and achieve freedom degree of effect
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no. 1 Embodiment approach
[0070] Several embodiments of the present invention relate to a motor drive circuit used in cooling devices for cooling electronic computers such as desktop or notebook personal computers and workstations, or electronic equipment such as refrigerators.
[0071] FIG. 1 is a circuit diagram showing the configuration of a cooling device 200 according to a first embodiment of the present invention. The cooling device 200 includes a motor drive circuit 100 , an H bridge circuit 110 , and a fan motor 120 .
[0072] The fan motor 120 is a single-phase full-wave motor in this embodiment, and is arrange|positioned facing the object to be cooled which is not shown in figure. In the fan motor 120 , the switching signals Vsw1 and Vsw2 generated by the motor drive circuit 100 and the H bridge circuit 110 control the coil current, that is, the energization state, thereby controlling the rotation of the fan motor 120 .
[0073] The H-bridge circuit 110 includes a first high-side transistor ...
no. 2 Embodiment approach
[0109] In the first embodiment, the low-side transistor (in the modified example, the high-side Transistor) on and off. On the other hand, in the second embodiment, the two low-side transistors are forcibly turned on during the period from when the stop signal Sstop becomes high to when the delay time τd elapses.
[0110] The motor drive circuit 100 of the second embodiment may basically have the same configuration as that of FIG. 1 . For example, in addition to the second timing signal ST2, the first timing signal ST1 is also input to the second synthesis circuit 6, and a logic operation is performed on the two timing signals, thereby detecting that only the first timing signal ST1 is at a high level. period. The second synthesizing circuit 6 controls the logic values of the first low-side driving signal SDL1' and the second low-side driving signal SDL2' so that the first low-side transistor ML1, the first low-side transistor ML1, and the Both low-side transistors ML2 ar...
no. 3 Embodiment approach
[0124] Embodiments of the present invention relate to a motor drive circuit used in cooling devices for cooling electronic computers such as desktop or notebook personal computers and workstations, or electronic equipment such as refrigerators.
[0125] FIG. 7 is a circuit diagram showing the configuration of a cooling device 200 according to a third embodiment of the present invention. The cooling device 200 includes a motor drive circuit 100 a , an H bridge circuit 110 , and a fan motor 120 .
[0126] The fan motor 120 is a single-phase full-wave motor in this embodiment, and is arrange|positioned facing the object to be cooled which is not shown in figure. The fan motor 120 is controlled by the switching signals Vsw1 and Vsw2 generated by the motor drive circuit 100a and the H-bridge circuit 110 to control its coil current, that is, the energized state, thereby controlling its rotation.
[0127] The H-bridge circuit 110 includes a first high-side transistor MH1, a second h...
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