Abstract: A digital control switching power supply unit includes an A/D converter circuit having a delay line circuit that has a delay element array whose delay time is controlled by a bias current, and that converts a current value into a digital signal using a signal transmission delay time, a phase difference detector circuit that detects a phase difference between a switching cycle and an A/D conversion cycle, a charge pump circuit that generates a control voltage in accordance with the phase difference, and a bias current indicator circuit that determines a bias current in accordance with an output voltage of the charge pump circuit and a result of a comparison of a detected value of the output voltage and a reference voltage, wherein the digital control switching power supply unit controls in such a way that the A/D conversion cycle is synchronized with the switching cycle.

Abstract: A potentiometric titration method including calculating a titration curve and a differential curve from measured values; computing a straight line (D) connecting the two measured values on the titration curve which are present adjacent to a tentative terminal point (P); computing a first estimation line (B1) and a second estimation line (B2) by a least squares method based on a set of the measured values (d1), (d2) and (d3) and a set of the measured values (d4), (d5) and (d6), respectively, on the titration curve, which are respectively spaced by a predetermined level apart from the tentative terminal point (P) by using the number of decision points (n) as an index where the number of decision points (n) represents the number of measured values on the previously set titration curve; computing an intermediate line (C) between the first estimation line (B1) and the second estimation line (B2); and computing an intersection point (A) of the intermediate line (C) and the straight line (D) to read out a value of t

Abstract: A flex-rigid printed wiring board is provided which can retain flexibility of a flexible portion while increasing durability of the flexible portion against folding, and can ensure conduction in a rigid portion, and a method of manufacturing the printed wiring board. The flex-rigid printed wiring board includes a conductor layer provided on at least one face of a base film, one region of the wiring board containing the base film being a rigid region, an another region containing the base film being a flexible region. The average thickness “tf” of the conductor layer on the base film formed in the flexible region and the average thickness “tR” of the conductor layer on the base film formed in the rigid region satisfy the relationship of tf<tR.

Abstract: A flex-rigid printed wiring board is provided which can retain flexibility of a flexible portion while increasing durability of the flexible portion against folding, and can ensure conduction in a rigid portion, and a method of manufacturing the printed wiring board. The flex-rigid printed wiring board includes a conductor layer provided on at least one face of a base film, one region of the wiring board containing the base film being a rigid region, an another region containing the base film being a flexible region. The average thickness “tf” of the conductor layer on the base film formed in the flexible region and the average thickness “tR” of the conductor layer on the base film formed in the rigid region satisfy the relationship of tf<tR.

Abstract: A current detection circuit for a power semiconductor device utilizes a sense function of the power semiconductor device. The magnitude of current flowing in power semiconductor devices 1, 11 is detected by a current-voltage conversion circuit 24 connected to sense terminals S, S of the power semiconductor devices. The detected signal is delivered to a current direction detection circuit 27, which detects the direction of the current and delivers the detected current direction signal to an external CPU 3, which in turn gives gain-setting and offset-setting signals corresponding to the current direction signal. An output gain adjuster 221 adjusts the magnitude of gain and an output offset adjuster 231 adjusts the magnitude of offset to correct for differences between the characteristics of the sense regions and the main regions of the power semiconductor devices.

Abstract: A digital control switching power supply unit converts an input voltage into a desired output voltage using a digitally controlled pulse width modulation (PWM) signal according to a switching cycle. The power supply unit includes an analog-to-digital converter (ADC). The ADC converts a result of a comparison between an output voltage and a reference voltage to a digital signal during a conversion cycle. The ADC includes a circuit for outputting a phase difference between a switching cycle and the conversion cycle, and a delay circuit. The delay circuit generates a delay output current based on a result of the comparison and the phase difference and determines the conversion time delay according to the delay output current. The delay circuit also generates a delay reference current based on the reference voltage and the phase difference and determining the duration of the conversion cycle according to the delay reference current.

Abstract: An internal combustion engine controller comprises a booster coil connected to a battery and a booster capacitor. A switch element is connected to the booster coil to control the passage of current through the booster coil and an interruption of the current. The booster capacitor accumulates electrical energy generated with an inductance of the booster coil at the time of the interruption of the passage of the current. A booster control circuit carries out control in a constant boost switching cycle so as to pass the current through the booster coil and the switch element until the current reaches a preset switching stop threshold value and then interrupt the current to charge the energy generated with the inductance of the booster coil into the booster capacitor. The booster control circuit is configured to ensure a minimum time period for the booster capacitor-charging of the energy within the boost switching cycle.

Abstract: A fully integrated DC-DC converter utilizes digitally controlled dual output stages to achieve fast load transient recovery is presented. The DC-DC converter includes a main converter output stage connected in parallel with an auxiliary output stage. The main output stage is responsible for steady-state operation and is designed to achieve high conversion efficiency using large inductor and power transistors with low on-resistance. The auxiliary stage is responsible for transient suppression and is only active when a load transient occurs. The auxiliary output stage performs well with inductor and power transistors much smaller than those of the main switching stage and thus achieves well balanced power conversion efficiency and dynamic performance with a much smaller area penalty than previously described dual-output-stage converters.

Abstract: A switching power supply system controlling switching operations of switching devices by a control circuit to convert an input voltage into a desired output voltage, the system being provided with a under voltage lock out circuit including: an input voltage detection unit detecting an input voltage and producing an input voltage digital signal corresponding to the input voltage Vin; and a voltage level comparison unit carrying out digital comparison of the input voltage digital signal with each of two voltage detection level data and outputting the results of the comparisons as an output signal, in which by changing voltage detection level data stored in two registers, desired voltage detection levels and hysteresis characteristic are easily actualized.

Abstract: A digital control switching regulator of the invention ON/OFF-controls switching elements by digital-controlled pulse width modulation signals and converts an input voltage to a desired output voltage. The switching regulator includes an input voltage detection circuit that includes: a voltage dividing circuit outputting a divided voltage of the input voltage; a comparator section comparing the divided voltage of the input voltage with a first reference voltage and a second reference voltage and outputting a first comparison signal and a second comparison signal indicating comparison results; and a control section controlling a dividing ratio of the voltage dividing circuit based on the first comparison signal and the second comparison signal to obtain the predetermined divided voltage, thereby outputting an input voltage digital signal corresponding to the input voltage. The input voltage digital signal controls controller coefficients for use in the digital control.

Abstract: A digital control switching power supply unit includes an A/D converter circuit having a delay line circuit that has a delay element array whose delay time is controlled by a bias current, and that converts a current value into a digital signal using a signal transmission delay time, a phase difference detector circuit that detects a phase difference between a switching cycle and an A/D conversion cycle, a charge pump circuit that generates a control voltage in accordance with the phase difference, and a bias current indicator circuit that determines a bias current in accordance with an output voltage of the charge pump circuit and a result of a comparison of a detected value of the output voltage and a reference voltage, wherein the digital control switching power supply unit controls in such a way that the A/D conversion cycle is synchronized with the switching cycle.

Abstract: An electronic circuit device comprises: a printed circuit board mounted with electronic components; a resin-molded portion formed of resin so disposed that the electronic components are covered therewith; a convex connector that has metal terminals for connection and is exposed from the resin-molded portion; and a sealing member wrapped around the resin-molded portion.

Abstract: A module comprises a metallic terminal pins for connection and a circuit board with electronic components mounted thereon, a circuit board connecting side of the connector. The electronic components and the circuit board with the electronic components mounted thereon are encapsulated with the same resin. A metallic base is united to the module to obtain an electric conduction between the metallic base and the circuit board.

Abstract: A thermoelectric conversion module includes a laminated body including a plurality of thermoelectric components laminated therein. Each of the thermoelectric components includes an insulating layer, and a thermoelectric conversion element section in which a plurality of p-type thermoelectric conversion material layers and a plurality of n-type thermoelectric conversion material layers are arranged on the insulating layer in a series connection. A step eliminating insulating material layer is arranged to eliminate a step between the thermoelectric conversion element section and a vicinity thereof, in a region between the insulating layers adjacent to each other in a laminating direction, around the p-type thermoelectric conversion material layers and n-type thermoelectric conversion material layers constituting the thermoelectric conversion element section. The thermoelectric conversion element section has a serpentine shape.

Abstract: A digital control switching power supply unit converts an input voltage into a desired output voltage using a digitally controlled pulse width modulation (PWM) signal according to a switching cycle. The power supply unit includes an analog-to-digital converter (ADC). The ADC converts a result of a comparison between an output voltage and a reference voltage to a digital signal during a conversion cycle. The ADC includes a circuit for outputting a phase difference between a switching cycle and the conversion cycle, and a delay circuit. The delay circuit generates a delay output current based on a result of the comparison and the phase difference and determines the conversion time delay according to the delay output current. The delay circuit also generates a delay reference current based on the reference voltage and the phase difference and determining the duration of the conversion cycle according to the delay reference current.

Abstract: The present invention provides a catalyst for combustion treatment of suspended particulate matter in diesel exhaust gases, and a combustion catalyst for treating diesel exhaust gases in which a precious metal or an oxide thereof as the catalytic component is loaded on a carrier composed of oxide ceramic particles comprising ceria-zirconia or ceria-praseodymium oxide. In the present invention, depending on the carried precious metal, the carrier is preferably composed of oxide ceramic particles further comprising yttria or lanthanum oxide. The present invention provides a sufficient activity to combust suspended particulate matter in exhaust gases, and can cause combustion at a low temperature of about 300° C. It operates stably for a long period, and can burn suspended particulate matter, especially carbon microparticles.

Abstract: A switching power supply that can suppress output variation at a time of transition of a control mode from a non-linear control mode to a linear control mode. The switching power supply includes instruction value forming circuitry that forms, in a linear control mode, a linear control instruction value for linearly control a switching circuit based on an error of an output voltage, and forms, in a non-linear control mode, a non-linear control instruction value for non-linearly control the switching circuit. The instruction value forming circuitry predicts, in the non-linear control mode, a linear control instruction value suited to the load current in the non-linear control mode, and uses the predicted linear control instruction value for an initial value of the linear control instruction value at a time of transition from the non-linear control mode to the linear control mode.

Abstract: An object of the present invention is to provide a medium supplement for animal cell culture and an animal cell culture medium. The present invention relates to a medium supplement for animal cell culture comprising sericin or a sericin derivative and an animal cell culture medium comprising at least said medium supplement and a basal medium composition.

Abstract: There is proposed a control unit for an internal combustion engine, which comprises a boost circuit, a switching element, a current detecting resistor and a controller and is designed to be actuated such that the boost circuit is used to boost a power source voltage to create a boosted voltage and the controller is used to control the switching element so as to enable the boosted voltage to flow to the injector solenoid coil. This control unit is designed such that, when the boost circuit goes out of order, the injector solenoid coil is excited by making use of the power source voltage without using the boosted voltage and without creating a peak current to thereby generate a first holding current required for opening the injector and a second holding current required for retaining the opened state of the injector, the second holding current being lower in intensity than the first holding current.

Abstract: A thermoelectric conversion module component includes a laminate formed of a plurality of stacked thermoelectric elements each including a unit circuit having repeated pn junction pairs that extend meanderingly and that are formed of p-type thermoelectric material layers and n-type thermoelectric material layers arranged so as to be alternately connected to each other on a surface of an insulating layer, and oblique joint surfaces at which electrodes are led out of the laminate. The oblique joint surfaces are such that a plurality of the thermoelectric conversion module components are electrically connected by contacting the surfaces with each other to form a ring. A thermoelectric conversion module includes a plurality of the thermoelectric conversion module components connected to each other to form a ring.