Abstract: A DC power source to supply DC power to a plasma generator is configured as a simple and small-sized device that forms high voltage for generating a plasma discharge. A step of passing a short-circuit current for extremely short time through the voltage source step-down chopper provided in the DC power source and accumulating energy in a reactor is performed repeatedly more than once, so as to discharge the energy accumulated in the reactor to the output capacitance and raise the output voltage sequentially, thereby boosting the voltage up to the ignition set voltage. The short-circuit current is formed by a switching element of a boosting circuit provided in the DC power source. Boosting the voltage at the output terminal by accumulating and discharging the short-circuit current is repeated to raise the voltage at the output terminal of the DC power source up to the ignition set voltage.

Abstract: In a voltage-type DC power supply provided with an inverter, current supply from the inverter to the load side is suppressed when arc is generated. DC output from the voltage-type DC power supply is suspended and resumed: upon suspending the DC output, the chopper is separated from the inverter, thereby suppressing excessive current to the load when arc is generated, allowing the arc to be extinguished at high speed, and holding the current passing through the chopper in the form of circulating current. Upon restarting the inverter, the circulating current being held is supplied to the load, thereby reducing a delay of supply of DC power to the load at the time of resuming the DC output from the voltage-type DC power supply.

Abstract: An electronic device includes a signal sender that sends a pair of transmission signals of mutually opposite phases to an external device via a pair of transmission paths. The signal sender differentiates each amplitude of the pair of transmission signals.

Abstract: A phase of the pulse control signal upon restarting is synchronized with the phase of the pulse control signal upon suspending, thereby suppressing fluctuations of output voltage in each phase of the inverter upon restarting and further suppressing fluctuations of voltage supplied to the load. Upon supplying DC power to a plasma generator, when arc discharge occurs in the plasma generator, supplying of the DC power is suspended to reduce damage on the electrodes and substrate, and further upon extinguishing of the arc discharge, supplying of the DC power is restarted. In suspending and resuming the DC output, the current flowing in the chopper upon suspending is held in the form of circulating current, and upon restarting the inverter, this circulating current is supplied to the load. Accordingly, it is possible to reduce a delay in supplying the DC power to the load, upon resuming the DC output.

Abstract: Intermittent short-circuit control is performed in the ignition mode, thereby allowing short-circuit current to flow in the current source step-down type chopper. Energy of the short-circuit current is temporarily accumulated in the inductor provided in the current source step-down type chopper. The accumulated energy boosts the output voltage from the direct current power supply device during the period until the next short circuiting, via the current, the multiphase inverter, and the rectifier. The voltage boosting operation where accumulation of the current energy by short circuiting and boosting of the output voltage by conduction are repeated, controls an increase of the output voltage which is applied to the plasma generator.

Abstract: Intermittent short-circuit control is performed in the ignition mode, thereby allowing short-circuit current to flow in the current source step-down type chopper. Energy of the short-circuit current is temporarily accumulated in the inductor provided in the current source step-down type chopper. The accumulated energy boosts the output voltage from the direct current power supply device during the period until the next short circuiting, via the current, the multiphase inverter, and the rectifier. The voltage boosting operation where accumulation of the current energy by short circuiting and boosting of the output voltage by conduction are repeated, controls an increase of the output voltage which is applied to the plasma generator.

Abstract: A phase of the pulse control signal upon restarting is synchronized with the phase of the pulse control signal upon suspending, thereby suppressing fluctuations of output voltage in each phase of the inverter upon restarting and further suppressing fluctuations of voltage supplied to the load. Upon supplying DC power to a plasma generator, when arc discharge occurs in the plasma generator, supplying of the DC power is suspended to reduce damage on the electrodes and substrate, and further upon extinguishing of the arc discharge, supplying of the DC power is restarted. In suspending and resuming the DC output, the current flowing in the chopper upon suspending is held in the form of circulating current, and upon restarting the inverter, this circulating current is supplied to the load. Accordingly, it is possible to reduce a delay in supplying the DC power to the load, upon resuming the DC output.

Abstract: A signal transmission device includes a signal sender that sends first and second transmission signals of mutually opposite phases, a first transmission path over which the first transmission signal is transmitted, a second transmission path over which the second transmission signal is transmitted, and a signal receiver that converts the first transmission signal received from the first transmission path and the second transmission signal received from the second transmission path into an output signal of a single phase. The signal transmission device differentiates each amplitude of the first and second transmission signals sent from the signal sender, and the signal receiver, based on an amplitude ratio of the first and second transmission signals, converts the received first and second transmission signals.

Abstract: A signal transmission device includes a signal sender that sends first and second transmission signals of mutually opposite phases, a first transmission path over which the first transmission signal is transmitted, a second transmission path over which the second transmission signal is transmitted, and a signal receiver that converts the first transmission signal received from the first transmission path and the second transmission signal received from the second transmission path into an output signal of a single phase. The signal transmission device differentiates each amplitude of the first and second transmission signals sent from the signal sender, and the signal receiver, based on an amplitude ratio of the first and second transmission signals, converts the received first and second transmission signals.

Abstract: In controlling switching elements of a current source inverter, a switching loss in the switching element is prevented according to a normal switching operation for a commutation operation, without requiring any particular control. In the commutation operation of the current source inverter, a timing for driving the switching elements is controlled in such a manner that an overlap period is generated, during when both a switching element at the commutation source and a switching element at the commutation target are set to be the ON state, a resonant circuit is controlled based on the control of the switching elements having this overlap period, and resonant current of the resonant circuit reduces the switching loss upon commutation operation of the switching elements.

Abstract: A steel plate for band-shaped die-cutting blades has a base part to a depth of more than 200 ?m from the steel plate surface and a chemical composition containing 0.40 to 0.80 mass % C and 0.10 to 0.50 mass % Nb. A spherical carbide constituted of cementite is present in the bainite or tempered martensite structure of the blade in an amount of 1.0 vol % or more. A Nb-containing carbide having an equivalent-circle diameter of 0.5 ?m or more is present at an existential density of 10.0 or more grains per 900 ?m2. The base part has a controlled hardness of from 300 to 450 HV. The surface layer part has a decarburized surface layer of ferrite single-phase and a thickness of 5 ?m or more. In a 15-?m-thick surface layer region, the existential density of the Nb-containing carbide is from 0 to 5.0 grains per 900 ?m2.

Abstract: In controlling switching elements of a current source inverter, a switching loss in the switching element is prevented according to a normal switching operation for a commutation operation, without requiring any particular control. In the commutation operation of the current source inverter, a timing for driving the switching elements is controlled in such a manner that an overlap period is generated, during when both a switching element at the commutation source and a switching element at the commutation target are set to be the ON state, a resonant circuit is controlled based on the control of the switching elements having this overlap period, and resonant current of the resonant circuit reduces the switching loss upon commutation operation of the switching elements.

Abstract: [Problem] To provide a zinc-based alloy-plated steel material in which low-carbon steel is used as the base material and which is excellent in resistance to molten-metal embrittlement cracking and has good workability. [Means for Resolution]A zinc-based alloy-plated steel material excellent in resistance to molten-metal embrittlement cracking, which has a zinc-based alloy-plating layer on the surface of a steel base material that has a chemical composition comprising, as % by mass, C: 0.010 to 0.100%, Si: at most 1.50%, Mn: at most 2.00%, P: at most 0.100%, S: at most 0.030%, N: at most 0.0050%, Ti: at most 0.050%, and B: 0.0003 to 0.0100%, with a balance of Fe and inevitable impurities, and having the value L to be defined by the following formula, L={(Ti/48)+(B/11)}/(N/14), of at least 5.50, and has a metallographic structure comprising ferrite: 10 to 99% by volume with a balance of bainite, pearlite, cementite or martensite.

Abstract: An antenna duplexer of the present invention includes a first transmission/reception circuit for transmitting/receiving a GSM signal, and a second transmission/reception circuit for transmitting/receiving DCS and W-CDMA signals, which are connected in parallel via a diplexer. A third trap circuit including an inductor and a capacitor for forming a series resonant circuit having a resonant frequency in the W-CDMA frequency band is connected to a transmission line of the first transmission/reception circuit between a second diode switch interposed in series therewith and a branch terminal. The inductor is interposed in series between the second diode switch and the branch terminal. The capacitor has one end connected to a connection line between the inductor and the second diode switch, with the other end grounded.

Abstract: An electrical connector comprises: a base connector having a base housing and fixed to a print board, the base housing defining a recess having a plurality of plane opponent contacts; a socket connector having a socket housing that houses a plurality of socket contacts to be connected with the opponent contacts, the socket connector inserted into and removed from the recess; a plurality of lead wires extending in a direction substantially parallel to an attachment face of the print board; a pair of first locking mechanisms provided with the base housing and the socket housing, respectively, the first locking mechanisms engaging each other in a direction perpendicular to the direction of extension of the lead wires; and a pair of second locking mechanisms provided with the base housing and the socket housing, respectively, the second locking mechanisms engaging each other in a direction opposite the direction of extension of the lead wires.

Abstract: A connector which has a structure appropriate for height-lowering is provided. The connector has a concave part 11 formed from a pair of opposing side walls 12a and 12b, and a back wall 12c which is orthogonal to this pair of opposing side walls 12a and 12b, and the rectangular plate bottom board. The blade contact 3 according to the present invention is configured such that it is inserted towards and engaged with the concave part 11 from the back wall 12c, and the contact connection part 31 for connecting to the opposing contact is in contact with the bottom surface of the concave part. Therefore, the position of the blade contact can be maintained by the bottom surface of the concave part 11 and the back wall 12c more firmly and easier. Thus, the thickness of the base 12 can be made thin and further lowering of the base connector can be realized.

Abstract: A socket contact which is connected to an opposing planar contact, comprises: a long connection part to which a lead wire is connected; and a contact connection part which is connected to the opposing contact provided on the base-end side of the connection part. The contact connection part comprises a planar contact body, a pair of extended arms which are almost parallel and extends from the base-end side of the contact body, and a pair of reversed arms which are almost parallel and extends from the tips of the pair of extended arms to the contact body, the tips of which are mutually joined. The pair of reversed arms are provided with a pair of contact points which are mutually opposed and into which opposing contacts can be inserted.

Abstract: A connector which has a structure appropriate for height-lowering is provided. The connector has a concave part 11 formed from a pair of opposing side walls 12a and 12b, and a back wall 12c which is orthogonal to this pair of opposing side walls 12a and 12b, and the rectangular plate bottom board. The blade contact 3 according to the present invention is configured such that it is inserted towards and engaged with the concave part 11 from the back wall 12c, and the contact connection part 31 for connecting to the opposing contact is in contact with the bottom surface of the concave part. Therefore, the position of the blade contact can be maintained by the bottom surface of the concave part 11 and the back wall 12c more firmly and easier. Thus, the thickness of the base 12 can be made thin and further lowering of the base connector can be realized.

Abstract: A socket contact which is connected to an opposing planar contact, comprises: a long connection part to which a lead wire is connected; and a contact connection part which is connected to the opposing contact provided on the base-end side of the connection part. The contact connection part comprises a planar contact body, a pair of extended arms which are almost parallel and extends from the base-end side of the contact body, and a pair of reversed arms which are almost parallel and extends from the tips of the pair of extended arms to the contact body, the tips of which are mutually joined. The pair of reversed arms are provided with a pair of contact points which are mutually opposed and into which opposing contacts can be inserted.

Abstract: An electrical connector comprises: a base connector having a base housing and fixed to a print board, the base housing defining a recess having a plurality of plane opponent contacts; a socket connector having a socket housing that houses a plurality of socket contacts to be connected with the opponent contacts, the socket connector inserted into and removed from the recess; a plurality of lead wires extending in a direction substantially parallel to an attachment face of the print board; a pair of first locking mechanisms provided with the base housing and the socket housing, respectively, the first locking mechanisms engaging each other in a direction perpendicular to the direction of extension of the lead wires; and a pair of second locking mechanisms provided with the base housing and the socket housing, respectively, the second locking mechanisms engaging each other in a direction opposite the direction of extension of the lead wires.