Abstract:
PROBLEM TO BE SOLVED: To synchronize a timing of pulse generation in a power transmission device with a timing of pulse reception in a power receiving device.SOLUTION: A Magnetic Energy Recovery Switch (MERS) receiving device 500 transmits electric power information indicative of an electric energy required for the MERS receiving device 500 to a MERS direct-current pulse router 400. The MERS direct-current pulse router 400 determines changing time of a power transmission side switch included in a MERS direct-current pulse converter 300 and a changing time of a power receiving side switch included in the MERS receiving device 500 on the basis of the received electric power information. The MERS direct-current pulse converter 300 generates the pulse current on the basis of the determined changing time of the power transmission side switch. The MERS receiving device 500 receives the pulse current on the basis of the determined changing time of the power receiving side switch.
Abstract:
PROBLEM TO BE SOLVED: To provide an induction motor control device, etc. which is adapted to realize more stable startup than ever or exert control to run an induction motor stably even when external disturbance is applied to it during operation.SOLUTION: MERSs 100u, 100v and 100w generate voltage equivalent to voltage generated by an AC power supply VS whose phase is varied by a value θset and apply voltage equivalent to a sum of this voltage and the voltage generated by the AC power supply to an induction motor M. A control unit 200 determines θset in such a way that a load current detected by a current detection unit GM converges to a value Iset and the effective value of a fundamental wave component of a load voltage detected by a voltage detection unit VM converges to a value Vset which is determined based on a deviation in the load current from the value Iset. While so doing, it also exerts feed-forward control so that a value proportional to the differential of this fundamental wave component and a value proportional to the load current become a value of θset, and then determines the transition timing of each gate signal based on this value of θset before feeding the gate signal to each MERS.
Abstract:
PROBLEM TO BE SOLVED: To provide a power conversion device that supplies an output of an AC power supply to a load by adjusting it, is compact and low in loss, and can perform PFC by soft switching. SOLUTION: The power conversion device 1 is constituted of an inductor L connected to the AC power supply 20 and the load 30 in series, a full-bridge type MERS 100 connected to the load 30 in parallel, a control circuit 110, a current direction switcher 200 serially connected between the inductor L and the load 30, and an ampere meter 300. The control circuit 110 feeds back a current detected by the ampere meter 300, repeatedly switches on/off one pair of semiconductor switches corresponding to the positive side of the output of the AC power supply 20 out of a pair of reverse conductive semiconductor switches SW2, SW3 and a pair of reverse conductive semiconductor switches SW1, SW4 which constitute the full-bridge type MERS 100, and keeps the other pair off. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To derive power efficiently from a low-voltage AC power supply to supply it to a load. SOLUTION: A power converter 1 includes an MERS 100 and a control means 105, and is connected in parallel between a series circuit composed of an AC power supply 210, a resistance R, and a reactor L and a load 300. The control means 105 switches on and off an inversely conductive semiconductor switch making up the MERS 100. The MERS 100 thus boosts an output from the power supply 210 and adjusts a current flowing through the power supply 210 to prevent the current from exceeding the rated current of the power supply 210. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
In order to provide a pulse power supply device using regenerating magnetic energy stored in a discharge circuit to a capacitor so as to use it as next discharge energy and supplying a bipolar pulse current with high repetition, a bridge circuit is composed of four inverse-conductive semiconductor switches, a charged energy source capacitor is connected to a DC terminal of the bridge circuit, and an inductive load is connected to its AC terminal. A control signal is supplied to gates of the inverse-conductive semiconductor switches, and a control is made so that when a discharge current rises, is maintained or is reduced, all the gates are turned off, and the magnetic energy of the electric current can be automatically regenerated to the energy source capacitor by a diode function of the switches. Further, a large-current power supply is inserted into a discharge circuit so as to replenish energy loss due to discharge, thereby enabling high-repetition discharge.