Abstract: In an AC link type boosting device, DC terminals of two voltage inverters are connected each other in series in additive polarity and plural AC terminals of each of the voltage inverters are connected to a transformer. The two voltage type inverters are AC linked to each other via the transformer. An external voltage applied between the DC terminals of the AC link type booster is divided by the voltage-type inverters.

Abstract: In an AC link type boosting device, DC terminals of two voltage inverters are connected each other in series in additive polarity and plural AC terminals of each of the voltage inverters are connected to a transformer. The two voltage type inverters are AC linked to each other via the transformer. An external voltage applied between the DC terminals of the AC link type booster is divided by the voltage-type inverters.

Abstract: A high-voltage pulse generating circuit has an inductor, a first semiconductor switch, and a second semiconductor switch which are connected in series between opposite terminals of a DC power supply unit, and a diode having a cathode terminal connected to a terminal of the inductor which has another terminal connected to an anode terminal of the first semiconductor switch, and an anode terminal connected to a gate terminal of the first semiconductor switch. The inductor stores an induction energy when the first semiconductor switch is rendered conductive by a turn-on of the second semiconductor switch, and generates a high-voltage pulse when the first semiconductor switch is turned off by a turn-off of the second semiconductor switch.

Abstract: A high-voltage pulse generating circuit has an inductor, a first semiconductor switch, and a second semiconductor switch which are connected in series between opposite terminals of a DC power supply unit, and a diode having a cathode terminal connected to a terminal of the inductor which has another terminal connected to an anode terminal of the first semiconductor switch, and an anode terminal connected to a gate terminal of the first semiconductor switch. The inductor stores an induction energy when the first semiconductor switch is rendered conductive by a turn-on of the second semiconductor switch, and generates a high-voltage pulse when the first semiconductor switch is turned off by a turn-off of the second semiconductor switch.

Abstract: A high-voltage pulse generating circuit has an inductor, a first semiconductor switch, and a second semiconductor switch which are connected in series between opposite terminals of a DC power supply unit, and a diode having a cathode terminal connected to a terminal of the inductor which has another terminal connected to an anode terminal of the first semiconductor switch, and an anode terminal connected to a gate terminal of the first semiconductor switch. The inductor stores an induction energy when the first semiconductor switch is rendered conductive by a turn-on of the second semiconductor switch, and generates a high-voltage pulse when the first semiconductor switch is turned off by a turn-off of the second semiconductor switch.

Abstract: A simple and less expensive high voltage pulse generating circuit including a low voltage direct current voltage source having one output terminal connected to another output terminal via a series circuit of a first switch with a low withstand voltage, an inductance storing inductive energy and a second switch with a high withstand voltage, and a branch circuit including a free-wheel diode connected between the other output terminal of the direct current voltage source and a common connection point between the first switch and the inductance. After storing inductive energy in the inductance by turning “on” the first and second switches, these first and second switches are turn “off” to commutate the energy stored in the inductance into a capacitive load connected across the second switch to charge the load abruptly and generate a high voltage pulse having a very narrow width without using a complicated and expensive magnetic compression circuit.

Abstract: A high-voltage pulse generating circuit has an inductor, a first semiconductor switch, and a second semiconductor switch which are connected in series between opposite terminals of a DC power supply unit, and a diode having a cathode terminal connected to a terminal of the inductor which has another terminal connected to an anode terminal of the first semiconductor switch, and an anode terminal connected to a gate terminal of the first semiconductor switch. The inductor stores an induction energy when the first semiconductor switch is rendered conductive by a turn-on of the second semiconductor switch, and generates a high-voltage pulse when the first semiconductor switch is turned off by a turn-off of the second semiconductor switch.

Abstract: A simple and less expensive high voltage pulse generating circuit including a low voltage direct current voltage source having one output terminal connected to the other output terminal via a series circuit of a first switch with a low withstand voltage, an inductance storing a inductive energy and a second switch with a high withstand voltage, and a branch circuit including a free-wheel diode being connected between the other output terminal of the direct current voltage source and a common connection point between the first switch and the inductance. After storing inductive energy in the inductance by turning-on the first and second switches, these first and second switches are turned-off to commutate the energy stored in the inductance into a capacitive load connected across the second switch to charge the load abruptly and generate a high voltage pulse having a very narrow width without using a complicated and expensive magnetic compression circuit.

Abstract: A semiconductor device constructed as a reverse conducting static induction thyristor including a thyristor section 114 formed by an n− silicon substrate 101, p+ gate regions 102, 104 formed in one surface of the substrate, a p+ anode region 111 formed in the other surface of the substrate, a main diode section 134 having a cathode region formed by the silicon substrate and an anode region 131 formed in the one surface of the substrate, and a series arrangement 145 of diodes including plural p+ anode regions 142, plural n+ cathode contact regions 143 formed in the first surface of the substrate, and plural conductive layers 144 connecting these anode regions and cathode contact legions successively. An anode and a cathode of the series arrangement of diodes are connected to a cathode electrode 110 and an anode electrode 113 of the thyristor section. Each of diodes in the series arrangement has a breakdown voltage lower than that of the thyristor section.

Abstract: A switching circuit for generating pulsed power including a plurality of capacitors connected in parallel with first and second output terminals, a plurality of series circuits of a primary conductor and a static induction thyristor connected in parallel with respective capacitors, a plurality of magnetic cores with which the primary conductors are magnetically coupled, respectively, and a series arrangement of a plurality of secondary conductors each being magnetically coupled with respective magnetic cores, both ends of the series arrangement being connected to first and second output terminals, respectively.

Abstract: A switching circuit for generating pulsed power including a plurality of capacitors connected in parallel with first and second output terminals, a plurality of series circuits of a primary conductor and a static induction thyristor connected in parallel with respective capacitors, a plurality of magnetic cores with which the primary conductors are magnetically coupled, respectively, and a series arrangement of a plurality of secondary conductors each being magnetically coupled with respective magnetic cores, both ends of, the series arrangement being connected to first and second output terminals, respectively.

Abstract: A semiconductor device constructed as a reverse conducting static induction thyristor including a thyristor section 114 formed by an n− silicon substrate 101, p+ gate regions 102, 104 formed in one surface of the substrate, a p+ anode region 111 formed in the other surface of the substrate, a main diode section 134 having a cathode region formed by the silicon substrate and an anode region 131 formed in the one surface of the substrate, and a series arrangement 145 of diodes including plural p+ anode regions 142, plural n+ cathode contact regions 143 formed in the first surface of the substrate, and plural conductive layers 144 connecting these anode regions and cathode contact legions successively. An anode and a cathode of the series arrangement of diodes are connected to a cathode electrode 110 and an anode electrode 113 of the thyristor section. Each of diodes in the series arrangement has a breakdown voltage lower than that of the thyristor section.

Abstract: A gate driving circuit for power semiconductor switch including a DC voltage source whose positive output terminal is connected to a cathode of a power semiconductor switch, a series circuit of a reactor and a turn-on switching element connected across the positive output terminal of the DC voltage source and a gate of the power semiconductor switch, a turn-off switching element connected across the gate of the power semiconductor switch and a negative output terminal of the DC voltage source, a freewheel diode connected across the negative output terminal of the DC voltage source and a junction point between the turn-on switching element and the reactor, and a control circuit for controlling the turn-on and turn-off switching elements such that the power semiconductor switch is kept non-conductive by making the first and second switching elements in off-state and in on-state, respectively, upon turning-on the power semiconductor switch, after storing energy in said reactor by changing the first switching e

Abstract: A driver circuit for a large capacity switching element like power transistors etc. having an overdrive function. The driver circuit supplies a sharp overdrive current only at the build-up time and the control thereafter is effected by a constant current source so that the current limiting resistor can be saved and the current capacity of the various elements may be decreased.

Abstract: A direct current to direct current converting chopper device comprising essentially two switching elements, two reactors, two diodes and three condensers likewisely with a conventional device but able to maintain rather stable output voltages to avoid higher harmonic noises and able to provide output voltage higher than the input voltage.

Abstract: A DC-DC converter that has an AC link includes an input current type inverter and an output voltage type inverter coupled together by a transformer. The negative terminal of the current type inverter is connected in series with the positive terminal of the voltage type inverter. Controlled rectifiers are used in the current type and voltage type inverters and the angle, relative to a fixed point in the AC cycle, at which the controlled rectifiers are turned on and off is varied to obtain desired converter action. A substantially smaller transformer, thus, is required.