Pulse current application device and control method of pulse current application device

A control method of a pulse current application device including

• a first switching element,
• an inductive load connected in series with the first switching element, the inductive load and the first switching element being connected between a power supply and a reference potential,
• a plurality of first commutation circuits connected in parallel to the inductive load, each of the plurality of first commutation circuits being connected between the reference potential and a connection point of the first switching element and the inductive load and including
• a current application target, and
• a second switching element connected
• in series with the current application target, the plurality of first commutation circuits including a first first commutation circuit and a second first commutation circuit,
• a second commutation circuit connected in parallel to the inductive load, the second commutation circuit being configured to
• have no current flowing therethrough while the second switching element is in a conductive state, and
• have a current flowing therethrough while the first switching element and the second switching element are in a cut-off state,
• a third switching element connected between the inductive load and the reference potential, and
• a regenerative diode connected between the power supply and a connection point of the inductive load and the third switching element, the regenerative diode being configured to return a current flowing therethrough back to the power supply while the third switching element is in a cut-off state,
• the control method comprising:
• placing the first switching element in a conductive state so as to accumulate, in the inductive load, energy received from the power supply,
• placing the second switching element of the first first commutation circuit in the conductive state so as to apply, in a reverse bias state, a current flowing through the inductive load to the current application target of the first first commutation circuit,
• placing the first switching element in the cut-off state so as to commutate the current flowing through the inductive load to the current application target of the first first commutation circuit,
• placing the second switching element of the first first commutation circuit in the cut-off state after commutating the current flowing through the inductive load to the current application target of the first first commutation circuit for a first prescribed period of time,
• placing the second switching element of the second first commutation circuit in the conductive state so as to commutate the current flowing through the inductive load to the current application target of the second first commutation circuit, and
• placing the second switching element of the second first commutation circuit in the cut-off state after commutating the current flowing through the inductive load to the current application target of the second first commutation circuit for a second prescribed period of time.