Abstract: High voltage and low voltage switch mode circuits and methods serve to recover the charge stored on electro-luminescent lamp panels that would otherwise be dissipated during the discharge cycle of a drive circuit. The high voltage circuits and methods operate to transfer the charge to the high voltage rail, while the low voltage circuits and methods operate to transfer the charge to the source of low drive voltage.

Abstract: An object of the present invention is to provide a miniaturized plane antenna having good axial ratio characteristics over a broad frequency range. An antenna equipped with feeding points at two axial directional impedance matching points of a radiation electrode formed on a surface of a dielectric substrate is mounted on a two-layer wiring board equipped with a 90° hybrid and ports. In the wiring board, the 90° hybrid by means of a closed conductor pattern is configured to have ports drawn out toward an inside of the closed conductor pattern to be connected with the antenna and another port to be connected to a coaxial line, and an earth conductor is arranged outside the closed conductor pattern so as to surround it or inside the closed conductor pattern. The 90° hybrid is adapted to be accommodated in a back face of the antenna.

Abstract: The present invention provides a small dielectric filter suitable for use in a high frequency band equal to or higher than 3 GHz. an input/output electrode made up of island type of conductive film is formed on one surface of said dielectric located on each end portion; in each of said dielectrics located on each end respectively, an earth electrode is formed on almost of all remaining area of said surface so as to be isolated from said input/output electrode and is also formed on all of the other surfaces with an exception of connecting surfaces; in an intermediate dielectric, an earth electrode is formed on all surfaces other than the connecting surface; and a conductive film connected to the earth electrode is formed on a part of at least one of the connecting surfaces of the dielectrics to be connected. Three or more elements of resonators may be integrally formed on a dielectric block, and, in that case, a through-hole is formed between the resonators.

Abstract: A semiconductor device having a current mirror circuit composed of a first transistor element Q11 and a second transistor element Q12 is used as a single transistor TD. A plurality of transistor elements for composing the first transistor element Q11 on the current referring side and a plurality of transistor elements for composing the second transistor element Q12 on the current reference side are dispersedly disposed to provide a uniform distribution density on a semiconductor substrate possibly.

Abstract: In prior art, the operation of the switching transistors Q1 and Q2 is within a range of class-AB to class-B and they are not good at efficiency since it is difficult to change the operating point thereof. There is disclosed an innovative switching power circuit which is self-oscillated by a tertiary winding N3 so that each of the pair of switching elements Q1 and Q2 may be conducted alternately and thereby a current flowing from the centertap is switched so as to selectively flow alternately to one side of the primary winding N1 or to other side thereof to generate an AC voltage on a secondary winding N2, said switching power circuit characterized by that an operating point of the switching elements Q1, Q2 is changed from that in starting by using a DC voltage generated by a switching operation of the switching elements Q1, Q2 as an inverse bias power source for the switching elements Q1, Q2.

Abstract: A switching power supply, eliminating effect of a potential difference generated in a driving circuit, in which a rapid operation speed of a switching transistor Q1 and a high efficiency are obtained. An auxiliary bias circuit forming a polarity inversion circuit together with the switching transistor Q1 is constructed by connecting a capacitor C3 and a diode D2 in series between a collector of the switching transistor Q1 and a ground, and by connecting a diode D3 and a capacitor C4 in series between a connection point of the capacitor C3 and the diode D2 and a ground. One end of a main current path of the transistor Q3 which conducts when the switching transistor Q1 is in an OFF state, is connected to a connection point of the diode D3 and the capacitor C4 in the auxiliary bias circuit 5a, thereby supplying a voltage obtained in the auxiliary bias circuit 5a to the switching transistor Q1 via the transistor Q3.

Abstract: An inverter transformer comprises an insulation bobbin (10) having a spool (12); a primary winding (30); and a secondary winding (4). A plurality of winding grooves (14) are defined by a plurality of flanges (13) provided on the side surface of the spool (12). The primary winding (30) is provided in one (14a) of the winding grooves (14). Another one (14b) of the winding grooves which has no winding provided therein is interposed between the primary winding (30) and the secondary winding (40).

Abstract: In order to process a solid processed object with a simple construction, and to process a solid and flat work while effectively collecting particulate scraps, in a machine tool for processing work in which a working table on which the work is mounted and a spindle in which a cutter is installed move relatively to each other, a bellow which telescopes freely is provided, one open end of which connects to the spindle head so as to surround the spindle, and the other open end of which connects to a working table in such a manner as to surround the work.

Abstract: A switching power supply circuit arranged such that stability of each output voltage is enhanced and the device is kept from being large-sized. Secondary winding N2 of transformer T1 is grounded at one end through diode D1: the other end of the secondary winding N2 is connected to first output terminal 2; and tap CT thereof is coupled to second output terminal 3 through diode D2; and capacitors C2 and C3 are connected between the first output terminal 2 and ground and between the second output terminal and ground respectively. In addition to being arranged as above, the present switching power supply circuit is further arranged such that first output voltage V.sub.01L is obtained from feedback voltage generated at the whole of the secondary winding N2, while second output voltage V.sub.02H is obtained from combination of induced voltage generated at winding section n21 defined through division by the tap CT of the secondary winding N2 and the first output voltage V.sub.01L.

Abstract: A switching circuit is provided for converting a DC voltage to an AC voltage required for driving an electroluminescent lamp. The switching circuit charges and discharges the electroluminescent lamp with a substantially constant current to thereby reduce peak currents and extend lamp life. A constant current discharge feature of the switching circuit results in a significant reduction in current consumption.

Abstract: The present invention provides a series control type regulator which can decrease rapidly an output voltage regardless of heaviness or lightness of a load when a first transistor for controlling an output voltage is set to a state of stop of operation. When a switching circuit sets the first transistor from a state of operation to a state of stop, at the same time an output capacitor is discharged by causing to a discharge circuit connected in parallel to the output capacitor. The discharge circuit starts operating by turning on a third transistor, which turns on by a current flowing to voltage dividing resistors of a detection circuit being used as a base current. The voltage dividing resistors of the detection circuit are also used as resistors for setting a base current of the third transistor.

Abstract: A dual-threshold voltage comparator circuit utilizes a single input pin of an integrated circuit and an external resistor network. Appropriate selection of the resistors comprising the resistor network permits independent setting of the dual thresholds of the comparator.

Abstract: In an AM radio receiver, a radio-frequency tuning circuit comprises a tuning coil, and variable capacitance diode elements connected to the tuning coil; a local oscillator circuit comprises an oscillator coil, a variable capacitance diode element connected in parallel with the oscillator coil, and a capacitance element connected in series with the oscillator coil; and tuning voltage is applied from a variable voltage source to the variable capacitance diode elements of the high-frequency tuning circuit, and to the variable capacitance diode element of the local oscillator circuit through a voltage adjustment circuit connected to the variable voltage source and a reference voltage source.

Abstract: An EL lamp driver employs constant power regulation rather than pulse frequency modulation to thereby eliminate the high voltage resistive divider network present in prior art EL lamp drivers that employ pulse frequency modulation.

Abstract: A self-oscillation-resonance type power supply circuit having a stabilizer for output voltages or output currents. A transformer and two transistors (a first transistor and a second transistor) are used to form a push-pull type self-oscillation-resonance type power supply circuit. Feedback signals that change according to resonant voltages are inputted to individual gates of the first transistor and the second transistor, a controller for generating error signals corresponding to the difference between a voltage signal and a reference signal is included in the circuit, and the error signals are fed to the individual gates of the first transistor and the second transistor, whereby conduction timing of the individual transistors is changed to vary the self-oscillation frequency.

Abstract: A power supply control device, by which a plurality of switching power supply circuits of different properties are operated under switching conditions respectively fitted therefor simultaneously with the prevention of an occurrence of what is called a low-frequency switching beat phenomenon, thereby achieving the miniaturization and the increasing of the efficiency of a power supply unit. To synchronize the timing of switching operations among control systems or units of the power supply control device, the control device of the multi-channel type or the control device having a master-slave function is used. Further, a frequency divider circuit or a frequency multiplier circuit is connected to a comparator of such a control device. Thereby, although synchronizing the timing among the switching operations, a plurality of pulse output signals of different frequencies are outputted from the control systems or the control units.

Abstract: A power supply control device, by which a plurality of switching power supply circuits of different properties are operated under switching conditions respectively fitted therefor simultaneously with the prevention of an occurrence of what is called a low-frequency switching beat phenomenon, thereby achieving the miniaturization and the increasing of the efficiency of a power supply unit. To synchronize the timing of switching operations among control systems or units of the power supply control device, the control device of the multi-channel type or the control device having a master-slave function is used. Further, a frequency divider circuit or a frequency multiplier circuit is connected to a comparator of such a control device. Thereby, although synchronizing the timing among the switching operations, a plurality of pulse output signals of different frequencies are outputted from the control systems or the control units.

Abstract: A video transmission apparatus comprises video codec for compression-encoding video data to be transmitted and decompression-decoding video data as received; a first audio codec for compression-encoding first audio data to be transmitted and decompression-decoding first audio data as received; a second audio codec for compression-encoding second audio data to be transmitted and decompression-decoding second audio data as received; a multiplexer-demultiplexer for including a three-channel buffer memory and processor; and an interface connectable to communications satellite network and ground network. In the multiplexer-demultiplexer, video data-first audio data and second audio data to be transmitted are multiplexed and converted to a packet based on a predetermined communication format, and packet as received is separated into video data-first audio data, and second audio data.

Abstract: A controller circuit for controlling and continuously varying the average value of discontinuous current pulses in a step down switching regulator operating in discontinuous conduction mode effects improvements in efficiency and output ripple of the switching regulator.

Abstract: A window glass antenna apparatus comprises two antennas exclusively for receiving respective AM and FM radio signals, a first impedance transformer disposed between the antennas and a signal cable for transforming impedance in an AM frequency band from high impedance to low impedance, and a second impedance transformer provided at an output side of the signal cable for transforming impedance in the AM frequency band from low impedance to high impedance. The first impedance transformer includes a primary winding which has one end connected to the AM radio signal receiving antenna, and a tap provided at a primary side thereof and connected to FM radio signal receiving antenna. The second impedance transformer includes a secondary winding which has one end for serving as an AM radio signal output terminal, and a tap provided at a secondary side thereof for serving as an FM radio signal output terminal.