Abstract: An apparatus includes a control device configured to serve as a principal controlling agent in an electric power conversion device incorporating a switching circuit configured to be a bidirectional inverter. The control device is configured to subtract, from a reference signal that is determined in accordance with an operation mode of the electric power conversion device, a multiplied signal obtained by multiplying a control-target current of the switching circuit by a prescribed coefficient to generate, based on a result of the subtraction, a control signal for controlling the bidirectional inverter.

Abstract: AC power supply device 1 includes input capacitors 11 and 12 connected at a neutral point X of a three-phase output, transistor bridges 20* (where * denotes U, V, and/or W) each consisting of PWM control badges 20*1 and 20*2 each including two switch elements, transformers T* connected to output terminals of the transistor bridges 20*, reactors Ls* connected to the transformers T*, smoothing capacitors 40* connected to the reactors Ls*. The transformers T* are autotransformers including a core 33* and windings 31* and 32* coupled with each other via the core 33*. One ends of the windings are connected to output terminals of the PWM control bridges 20*1 and 20*2, respectively, while the other terminals are connected to the reactors Ls*. The windings 31* and 32* are wound in such directions that magnetic fluxes generated in the core 33* are cancelled with each other.

Abstract: A control device 100 is used as a principle controller of an electric power conversion device 1 having a switch circuit 10 including transistors M1-M4. The control device: subtracts, from a reference signal REF set in accordance with an operating mode MODE (PFC/INV) of the electric power conversion device 1, a product signal (K×I) obtained by multiplying an object-of-control electric current I of the switch circuit 10 by a prescribed coefficient K; and generates, on the basis of the computation result (=REF?K×I), control signals S1-S4 (and consequently, gate signals G1-G4) for the transistors M1-M4.

Abstract: AC power supply device 1 includes input capacitors 11 and 12 connected at a neutral point X of a three-phase output, transistor bridges 20* (where * denotes U, V, and/or W) each consisting of PWM control badges 20*1 and 20*2 each including two switch elements, transformers T* connected to output terminals of the transistor bridges 20*, reactors Ls* connected to the transformers T*, smoothing capacitors 40* connected to the reactors Ls*. The transformers T* are autotransformers including a core 33* and windings 31* and 32* coupled with each other via the core 33*. One ends of the windings are connected to output terminals of the PWM control bridges 20*1 and 20*2, respectively, while the other terminals are connected to the reactors Ls*. The windings 31* and 32* are wound in such directions that magnetic fluxes generated in the core 33* are cancelled with each other.

Abstract: The alternating-current power supply device 1 has: an alternating-current generation bridge 10 for obtaining an alternating-current output; PWM control bridges 20, 30, each including two switch components; and a coupling reactor 40 connected to the PWM control bridges 20, 30. The coupling reactor 40 includes: a core 43; and windings 41, 42 which are connected at one end to respective output ends of the PWM control bridges 20, 30 while being coupled with each other via the core 43. The windings 41, 42 are respectively wound in such directions that magnetic fluxes generated in the core 43 cancel each other out.

Abstract: This DC power supply device comprises: a transformer having a primary magnetic core, a secondary magnetic core, at least one primary coil wound on the primary magnetic core, and a plurality of secondary coils wound on the secondary magnetic core; and at least one bridge composed of transistors. The DC power supply device has: a primary circuit connected to the primary coil; and a plurality of secondary circuits respectively connected to the plurality of secondary coils and each having a first secondary resonance capacitor, a second secondary resonance capacitor, and a smoothing circuit. The primary circuit and the plurality of secondary circuits are electrically insulated from each other by the transformer. In the plurality of secondary circuits, output parts of respective smoothing circuits are serially connected to each other. The primary magnetic core and the secondary magnetic core are disposed to face each other with an insulator disposed therebetween.

Abstract: This DC power supply device comprises: a transformer having a primary magnetic core, a secondary magnetic core, at least one primary coil wound on the primary magnetic core, and a plurality of secondary coils wound on the secondary magnetic core; and at least one bridge composed of transistors. The DC power supply device has: a primary circuit connected to the primary coil; and a plurality of secondary circuits respectively connected to the plurality of secondary coils and each having a first secondary resonance capacitor, a second secondary resonance capacitor, and a smoothing circuit. The primary circuit and the plurality of secondary circuits are electrically insulated from each other by the transformer. In the plurality of secondary circuits, output parts of respective smoothing circuits are serially connected to each other. The primary magnetic core and the secondary magnetic core are disposed to face each other with an insulator disposed therebetween.

Abstract: The alternating-current power supply device 1 has: an alternating-current generation bridge 10 for obtaining an alternating-current output; PWM control bridges 20, 30, each including two switch components; and a coupling reactor 40 connected to the PWM control bridges 20, 30. The coupling reactor 40 includes: a core 43; and windings 41, 42 which are connected at one end to respective output ends of the PWM control bridges 20, 30 while being coupled with each other via the core 43. The windings 41, 42 are respectively wound in such directions that magnetic fluxes generated in the core 43 cancel each other out.

Abstract: A power supply device has resonance-type DC-DC converters of three phases connected in parallel, said converters respectively having operation phases shifted from each other by 120°. The converters include switching circuits, series resonant circuits, and rectifying smoothing circuits, respectively. The series resonant circuits include first transformers, second transformers and resonance capacitors, respectively. Each of primary winding wires of the first transformers, each of primary winding wires of the second transformers, and respective resonance capacitors are connected in series. Each of secondary winding wires of the second transformers is connected to each of the rectifying smoothing circuits. The first transformers are provided with different cores, respectively, the primary winding wires and the secondary winding wires are insulated from each other by means of dividing bobbins, and the secondary winding wires of respective phases are connected in parallel.

Abstract: A power supply device has resonance-type DC-DC converters of three phases connected in parallel, said converters respectively having operation phases shifted from each other by 120°. The converters include switching circuits, series resonant circuits, and rectifying smoothing circuits, respectively. The series resonant circuits include first transformers, second transformers and resonance capacitors, respectively. Each of primary winding wires of the first transformers, each of primary winding wires of the second transformers, and respective resonance capacitors are connected in series. Each of secondary winding wires of the second transformers is connected to each of the rectifying smoothing circuits. The first transformers are provided with different cores, respectively, the primary winding wires and the secondary winding wires are insulated from each other by means of dividing bobbins, and the secondary winding wires of respective phases are connected in parallel.

Abstract: In order to achieve an object to reduce a surge voltage and suppress noise generation, the present invention provides a DC-DC converter with a snubber circuit, which boosts a voltage Vi of a DC power supply. The snubber circuit includes: a series circuit connected to both ends of a smoothing capacitor Co and including a snubber capacitor Cs and a snubber resistor Rs; a snubber diode Ds1 connected to a node at which the snubber capacitor Cs and the snubber resistor Rs are connected, and to a node at which a reactor Lr1 and an additional winding 1b of a transformer T1 are connected; and a snubber diode Ds2 connected to the node at which the snubber capacitor Cs and the snubber resistor Rs are connected, and to a node at which a reactor Lr2 and an additional winding 2b of a transformer T2 are connected.

Abstract: A DC/DC converter has three half-bridge-type current resonant DC/DC converters that are connected in parallel, have a phase difference of 120 degrees, and are operated at a frequency higher than a resonant frequency. Each of the three half-bridge-type current resonant DC/DC converters includes a transformer having a primary winding, a secondary winding, and a tertiary winding, a series circuit connected to both ends of a DC power source and including first and second switching elements, a series circuit connected to both ends of the first or second switching element and including a resonant reactor, the primary winding of the transformer, and a resonant capacitor, and a rectifying circuit to rectify a voltage generated by the secondary winding and output the rectified voltage to a smoothing capacitor. The tertiary windings are annularly connected to a reactor.

Abstract: The present invention provides a DC-DC converter including a first series circuit connected to both ends of a first switch and formed of a winding of a first transformer, a first reactor, a first diode, and a smoothing capacitor, a second diode connected to a connection point of a primary winding of the first transformer, the winding of the first transformer and the first switch, and to one end of the smoothing capacitor, a second series circuit connected to both ends of a second switch and formed of a winding of a second transformer, a second reactor, a third diode, and the smoothing capacitor, a fourth diode connected to a connection point of a primary winding of the second transformer, the winding of the second transformer and the second switch, and to the one end of the smoothing capacitor, a third reactor connected to both ends of a series circuit of a secondary winding of the first transformer and a secondary winding of the second transformer, and a control circuit which alternately turns on the first s

Abstract: In order to achieve an object to reduce a surge voltage and suppress noise generation, the present invention provides a DC-DC converter with a snubber circuit, which boosts a voltage Vi of a DC power supply. The snubber circuit includes: a series circuit connected to both ends of a smoothing capacitor Co and including a snubber capacitor Cs and a snubber resistor Rs; a snubber diode Ds1 connected to a node at which the snubber capacitor Cs and the snubber resistor Rs are connected, and to a node at which a reactor Lr1 and an additional winding 1b of a transformer T1 are connected; and a snubber diode Ds2 connected to the node at which the snubber capacitor Cs and the snubber resistor Rs are connected, and to a node at which a reactor Lr2 and an additional winding 2b of a transformer T2 are connected.

Abstract: A current-mode controlled DC-DC converter includes a comparator comparing a first or second current detection signal with a first or second reference current that is based on an error voltage of a voltage detection signal, a pulse generator generating a first pulse signal whose ON time is longer than an interval between when the second current detection signal reaches a minimum value and when the second current detection signal reaches the second reference current, a pulse generator generating a second pulse signal whose ON time is longer than an interval between when the first current detection signal reaches a minimum value and when the first current detection signal reaches the first reference current, the second pulse signal being behind the first pulse signal by a half period, and a PWM circuit generating a first or second PWM signal according to the pulse signal and an output signal from the comparator, thereby turning on/off a switch.

Abstract: A monolithic switching device including a main semiconductor region configured to provide a current-carrying channel as in the form of two-dimensional electron gas. Disposed symmetrically on a surface of the main semiconductor region are two main electrodes to be coupled to an electric circuit for switching control, two gate electrodes for individually controlling current flow between the main electrodes through the current-carrying channel, and two diode-forming electrodes electrically connected respectively to the two main electrodes. The device operates in either Switch On Mode, Switch Off Mode, Negative Current Mode, or Positive Current Mode depending upon voltages applied to the two gate electrodes.

Abstract: A DC/DC converter has three half-bridge-type current resonant DC/DC converters that are connected in parallel, have a phase difference of 120 degrees, and are operated at a frequency higher than a resonant frequency. Each of the three half-bridge-type current resonant DC/DC converters includes a transformer having a primary winding, a secondary winding, and a tertiary winding, a series circuit connected to both ends of a DC power source and including first and second switching elements, a series circuit connected to both ends of the first or second switching element and including a resonant reactor, the primary winding of the transformer, and a resonant capacitor, and a rectifying circuit to rectify a voltage generated by the secondary winding and output the rectified voltage to a smoothing capacitor. The tertiary windings are annularly connected to a reactor.

Abstract: A bi-directional DC-DC converter includes a first series circuit connected to ends of a first DC power source and including a first winding of a first reactor and a first switch; a second series circuit connected to ends of the first switch and including a second winding of the first reactor, a second reactor, a second switch, a third switch, and a second DC power source; a third series circuit connected to the ends of the first switch and including a fourth switch and the second DC power source; and a control circuit configured to turn on/off the switches and thereby carry out step-up and step-down operations between the first and second DC power sources.

Abstract: A bi-directional DC-DC converter includes a first series circuit connected to ends of a first DC power source and including a first winding of a first reactor and a first switch; a second series circuit connected to ends of the first switch and including a second winding of the first reactor, a second reactor, a second switch, a third switch, and a second DC power source; a third series circuit connected to the ends of the first switch and including a fourth switch and the second DC power source; and a control circuit configured to turn on/off the switches and thereby carry out step-up and step-down operations between the first and second DC power sources.

Abstract: A current-mode controlled DC-DC converter includes a comparator comparing a first or second current detection signal with a first or second reference current that is based on an error voltage of a voltage detection signal, a pulse generator generating a first pulse signal whose ON time is longer than an interval between when the second current detection signal reaches a minimum value and when the second current detection signal reaches the second reference current, a pulse generator generating a second pulse signal whose ON time is longer than an interval between when the first current detection signal reaches a minimum value and when the first current detection signal reaches the first reference current, the second pulse signal being behind the first pulse signal by a half period, and a PWM circuit generating a first or second PWM signal according to the pulse signal and an output signal from the comparator, thereby turning on/off a switch.