Motor drive device

A motor drive device that drives a single-phase direct-current motor, the motor drive device comprising:

• a first drive circuit that includes a first upper arm switch that electrically connects one end of a coil of the single-phase direct-current motor and a power source, a first lower arm switch that electrically connects the one end of the coil and GND, and a circuit to control an energization period of the first upper arm switch and the first lower arm switch;
• a second drive circuit that includes a second upper arm switch that electrically connects another end of the coil and the power source, a second lower arm switch that electrically connects the other end of the coil and the GND, and a circuit to control an energization period of the second upper arm switch and the second lower arm switch;
• a current detection circuit to detect current flowing through the coil, and output a current detection signal indicating a detection result of the current;
• a first protection circuit to determine whether or not overcurrent has occurred based on the current detection signal, and output a first enable signal indicating a determination result to the first drive circuit;
• and
• a second protection circuit to determine whether or not overcurrent has occurred based on the current detection signal, and output a second enable signal indicating a determination result to the second drive circuit;
• wherein
• a first enable signal line to transmit the first enable signal to the first drive circuit and a second enable signal line to transmit the second enable signal to the second drive circuit are wirings independent of each other.