Abstract:
PROBLEM TO BE SOLVED: To provide a low-loss current-fed series resonance DC/DC converter that can bi-directionally supply DC power and can perform soft switching with simple control regardless of power supply output voltage.SOLUTION: The current-fed series resonance DC/DC converter discharges electrostatic energy accumulated on capacitors CM1 and CM2 by turning on MERSs 101 and 102 to accumulate the energy on an inductor Lm as magnetic energy, and accumulates the magnetic energy accumulated on the inductor Lm onto a capacitor on the power receiving side by turning off the MERS on the power receiving side earlier than the MERS on the power supplying side, and charges a battery on the power receiving side with the electrostatic energy accumulated on the capacitor.
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:
PROBLEM TO BE SOLVED: To provide a dimming device, etc. capable of dimming a lamp using a magnetic ballast.SOLUTION: A dimming device 10 comprises: a control unit 11 which specifies a frequency; and a frequency conversion unit 12 which is arranged between light-emitting parts 20 each including a lamp 22 and a magnetic ballast 21 connected in series with the lamp 22, and an external power source 3 for supplying electrical power to the light-emitting parts 20, and which converts an AC voltage from the external power source 3 into an AC voltage at the frequency specified by the control unit 11 before outputting the converted voltage to the light-emitting parts 20. The control unit 11 changes the frequency of the AC voltage outputted to the light-emitting parts 20 by changing the specified frequency, thereby changing the emission luminance of the lamps 22.
Abstract:
PROBLEM TO BE SOLVED: To provide an AC voltage control unit using one switch MERS for solving various problems in controlling an inductive load having current polarity. SOLUTION: The AC voltage control unit includes: an AC switch circuit; a capacitor connected to the AC switch in parallel for regenerating and accumulating magnetic energy of currents flowing through the inductive load when the currents of the AC switch circuit are interrupted; a control circuit for performing ON/OFF control by giving a control signal to the AC switch circuit; and a capacitor voltage detection circuit for detecting a point of time when both end voltages of the capacitor are turned to be almost zero, and for transmitting a command signal to turn on the AC switch circuit to the control circuit. Capacitance of the capacitor is turned to be a capacitor in a resonant state with the inductance component of an inductive load with frequency which is equal to or more than the frequency of the AC power source. The control circuit turns on the AC switch circuit by transmitting an ON control signal to the AC switch circuit in reception timing of the command signal, and then, transmits the control signal to turn off the AC switch circuit after the lapse of the preliminarily set ON time (time within the semi-cycle of the cycle of the AC power source). COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an AC voltage control device capable of adjusting a voltage of an inductive load connected to an AC power source by a simple method. SOLUTION: A magnetic energy regenerative switch in which a capacitor and an AC switch circuit are connected in parallel between an AC power source and an inductive load. After the AC switch circuit is turned on at the timing when the voltage of a capacitor is almost zero which occurs twice during one cycle of the AC power source, it is turned off when a preset time period (several milliseconds), which is the time required for charging/discharging of capacitor or more in a half-cycle of the AC power source or below, passes so that the current flowing the capacitor takes a route of the AC switch circuit only during a preset time period. By allowing a reactance voltage of the capacitor to be variable by extending/shortening the predetermined time period, a load voltage is adjusted. COPYRIGHT: (C)2010,JPO&INPIT
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 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 provide a small-sized and low-loss rectifier circuit capable of improving power factor.SOLUTION: Power outputted from an AC power supply AC is caused to be stored in inductors L1 and L2 as magnetic energy via a switch SW1 (or SW2) in an on-state. When the switch SW1 (or SW2) is turned off, the magnetic energy is stored in a capacitor CM as electrostatic energy. The electrostatic energy in the capacitor CM is discharged to a load, after the completion of the discharging, the switch SW1 (or SW2) is turned on again. The on/off frequency and on-time of the switch are constant, thereby achieving current sensor-less and ideal PFC.
Abstract:
PROBLEM TO BE SOLVED: To reduce a current flowing through each switch in a MERS for increasing a current from an AC power supply to a load.SOLUTION: A MERS 110 short/open-circuits an AC power supply VS for several ten degrees from a time point of negative-to-positive transition of an output voltage of the AC power supply VS (for a local period when the output voltage of the AC power supply VS is lower than a voltage required for a load LD) to increase power supplied to the load LD.