Patent ID: 11967880
Assignee: DAIKIN INDUSTRIES, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC H

Claim 0:
1. A power supply circuit that supplies a current from a DC voltage source to first and second actuator coils so that the first and second actuator coils support an object in a non-contact manner by an electromagnetic force, the power supply circuit comprising:
a first leg having a first upper-arm switching element and a first lower-arm switching element connected in series to each other, the first leg being connected to the DC voltage source; and
a control unit configured to turn the first upper-atm switching element and the first lower-arm switching element on and off to control the current supplied to the first and second actuator coils,
the first and second actuator coils being connected in series to each other,
a midpoint between the first upper-arm switching element and the first lower-arm switching element being connected to a connection point between the first and second actuator coils,
a freewheeling diode being provided for each of the first upper-arm switching element and the first lower-arm switching element in parallel, and
the control unit being configured to perform control so that
the current flows through the first actuator coil in a direction toward the connection point and
the current flows through the second actuator coil in a direction coming out of the connection point.