Abstract:
PROBLEM TO BE SOLVED: To provide a power conversion device capable of achieving a PFC action of an input current and AC-DC conversion with suppressed switching loss, using a magnetic energy regenerative switch having a soft switching function.SOLUTION: The power conversion device 1 includes: an input section 100; a MERS 110; an output section 120; and a low-pass filter comprised of an inductor L and a capacitor C. The capacitor C is connected in parallel between the input section 100 and the MERS 110, and the inductor L is connected in series between the input section 100 and the MERS 110 to achieve a PFC action of an input current and to suppress loss with simple control without necessity of input sensor.
Abstract:
PROBLEM TO BE SOLVED: To provide an induction motor control device for controlling an induction motor so as to stably operate it.SOLUTION: Magnetic Energy Recovery Switches 100u, 100v, and 100w generate a voltage equivalent to one obtained by fluctuating the phase of a voltage generated by AC power supply VS by a value θset, and impress a voltage equivalent to the sum of the voltage and the voltage generated by the AC power supply VS on an induction motor M. A control part 200 determines the θset so that the effective value of the fundamental wave component of a load voltage detected by a voltage detecting part VM converges to a prescribed value, and determines timing of transition of each gate signal based on the θset value to supply the signal to each Magnetic Energy Recovery Switch.
Abstract:
PROBLEM TO BE SOLVED: To provide an induction power supply system, a power receiving device and a control method which have a high efficiency independently of a degree of coupling and leakage inductance of a transformer.SOLUTION: The induction power supply system 10 comprises: a power supply device 11 provided with an AC power supply VS, a primary coil L1, and a series circuit; and a power receiving device 12 provided with a secondary coil L2, a magnetic energy regeneration switch 100, a rectifier DB, a load LD, and wireless control devices 201, 202. A current flows into the primary coil L1 from the AC power supply VS, and thereby, a magnetic field is generated in the primary coil L1, and a current flows into the secondary coil L2 by the magnetic field. The wireless control devices 201, 202 control a magnetic energy regeneration switch 100 based on the current flowing into the primary coil L1, and thereby, resonance is always made to be maintained with capacitors CM1, CM2 of the magnetic energy regeneration switch 100 even if a leakage inductance Ls of the secondary coil L2 changes.
Abstract:
PROBLEM TO BE SOLVED: To reduce variations in one cycle for the amount of magnetic energy accumulated in an inductive load and recovered as electrostatic energy in a capacitor of MERS.SOLUTION: A power converter 1 comprises a MERS 100, a control circuit 200 and a voltage detector VM, and is connected between an AC power supply VS and an inductive load LD. The voltage detector VM detects a voltage of a capacitor CM for the MERS 100. The control circuit 200 controls a voltage output from the AC power supply VS and supplies the voltage to the inductive load LD by switching four reverse conduction type semiconductor switches SW1 to SW4 constituting the full-bridged MERS 100. The control circuit 200 also controls the duty ratio of the reverse conduction type semiconductor switches SW1 to SW4 of the MERS 100 so that a peak voltage value of the capacitor CM becomes constant.