<p>An electronic control device comprises a power generation unit having a composite coil comprised of serially-connected first and second coils, which generates an AC voltage according to a change in a magnetic flux direction associated with the rotation of a permanent magnet; a first power supply unit for smoothing the result of a full-wave rectification after performing the full-wave rectification according to the AC voltage generated in the composite coil; a second power supply unit for performing rectification according to the AC voltage generated in the first coil and performing the rectification according to the AC voltage generated in the second coil while smoothing the voltage at the connection point between the first coil and the second coil; a computation processing unit for performing an operation using the power supplied from the first power supply unit as the operating power; and a function execution unit for performing an operation under the control of the computation processing unit using the power supplied from the second power supply unit as the operating power.</p>
