To downsize a mounting space of a flyback circuit.
A flyback circuit 150 includes a motor 160, a positive voltage line 190 and a negative voltage line 195 applying a positive voltage and a negative voltage to the motor 160, a power-supply switch 170 switching on and off of the positive voltage line 190, a flyback line 194 bypass-connecting the motor 160, and a two-element composite field-effect transistor 180 provided on the flyback line 194. The flyback line 194 has first and second flyback lines 194-1 and 194-2 connected to the positive voltage line 190 and the negative voltage line 195, respectively. In the two-element composite field-effect transistor 180, a cathode of a parasitic diode 189 is connected to the first flyback line 194-1 and an anode is connected to the second flyback line 194-2, and a gate terminal 188 and a source terminal 187 are short-circuited.
| JPH04145889 | SPEED CONTROLLER FOR DC MOTOR |
| JPS60121990 | MOTOR DRIVE TYPE MOVING X-RAY DEVICE |
EMDE CHRISTOPH
TSUBOI SHINTARO
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| JP2011160559A | 2011-08-18 | |||
| JP2000134980A | 2000-05-12 | |||
| JP2000125564A | 2000-04-28 |
| US20070018716A1 | 2007-01-25 |