A balun transformer (10) may be constructed as a chip type transformer including a laminate (12) having first through fifth dielectric substrates (14a), (14b), (14c), (14d), and (14e) to be superimposed one on the other. An earth electrode (16) is formed on one main surface of the first dielectric substrate (14a), and an earth electrode (30) is formed on one main surface of the fifth dielectric substrate (14e). A connecting electrode (20) is formed on one main surface of the second dielectric substrate (14b). A first strip line (22) is formed on one main surface of the third dielectric substrate (14c). The first strip line (22) consists of a first spiral portion (24a) and a second spiral portion (24b). A second spiral strip line (26) and a third spiral strip line (28) are formed on one main surface of the fourth dielectric substrate (14d). The second strip line (26) and the third strip line (28) are electromagnetically connected with the first portion (24a) of the first strip line (22) and the second portion (24b) thereof, respectively.

Chip type transformer

Full-automatic bread maker

PURPOSE: To provide the resonance characteristic and to attain the reception with high sensitivity by providing a loop antenna at a side where a high frequency pickup opposes to a chain circumferential ridge and connecting a capacitor in series with the antenna. CONSTITUTION: An outer conductor of a coaxial cable 52 is grounded and a signal detected by the loop antenna 42 is sent to a receiver 54 by the cable 52. The receiver 54 has an impedance matching circuit 56, an amplifier circuit 58 and a selection output circuit section 60. The circuit 56 includes a band-pass filter 62 and a discharge tube 64, a detection voltage of a capacitor 44 obtained from the antenna 42 is fed to the input side of the filter 62 and an output of the filter 62 connects to a parallel circuit comprising an electrostatic breakdown protecting discharge tube 64 and a capacitor C 3 . The impedance matching for the antenna 42 is attained by the filter 62 and its output signal is amplifier by a high frequency amplifier circuit 58. The circuit 58 includes 2-stage connection transistors Q 1 , Q 2 and its output is fed to a selection output circuit 60, from which a sound output is obtained. COPYRIGHT: (C)1987,JPO&Japio

Antenna system for automobile

PURPOSE: To provide a measure against the situation where AC output voltage or reactive power output can not be increased only through control at the side of power inverter, by increasing DC voltage at the side of power rectifier. CONSTITUTION: Power fed from an AC system 1 is rectified through a transformer 2 and an external commutated rectifier 3, then inverted through a self- commutated power inverter 13 and fed through a transformer 14 to an AC system 15. Voltage and current of the AC system 15 are detected respectively through transformers 19, 20, then active and reactive powers are operated and compared with set values. Thereafter, control angle θ and phase ψ are varied by an operating unit 40 through a reactive power operating unit 21 and a constant power controller 38 so as to control the power inverter 13. When the capacity of the power inverter reaches to its limit, the phase ψ reaches a lower limit which is lower than a referential value ψ m , and thereby a limiter 52 produces an output which is added to DC voltage setting value E ref of the rectifier 3. Consequently, DC voltage of the rectifier 3 increases. COPYRIGHT: (C)1988,JPO&Japio

Controller for ac/dc converter

PURPOSE:To improve driveability of a vehicle, by indicating a shift on the basis of an acceleration or deceleration condition of the vehicle, in the case of a device which determines a permissible car speed range corresponding to the present discriminated gear position and indicates the gear shift when a car speed is out of said range. CONSTITUTION:When an engine is operated, a control circuit 8, first obtaining a car speed V and an engine speed NE from each output of a car speed sensor 1 and an engine speed sensor 2, stores each average of those values in a random access memory (RAM)15. Next, acceleration A(=DELTAV/DELTAt) and a gear position K(=NE/V) are calculated at every predetermined period. And next, discriminating the present gear position, after a permissible car speed range is determined in accordance with a water temperature signal from a water temperature sensor 6 in every gear position, it is decided whether or not the car speed is of value within said range. Then a lamp 9 indicating a gear shift is turned on at decision of NO, but a device is controlled so that this lamp may be turned on in accordance with the condition of acceleration or deceleration of a vehicle after a predetermined delay time.

Shift indicating method of gear position in speed change gear

PURPOSE:To obtain a 3-phase in inverter which does not contain tertiary, quinary and nonary harmonic waves and can reduce the septenary harmonic wave economically by connecting two output transformers connected in series at the secondary side to 3-phase inverters of specific two sets CONSTITUTION:The third period of 60 deg divided equivalently into two segments of positive and negative half period is used as no voltage period, and two output transformers Tr1, Tr2 connected at the secondary side in series are connected to two sets of 3-phase inverter IV-1, IV-2 controlled in the pulse width at the equal interval of the first and second conducting angles r The phase difference between two sets of 3-phase inverters IV-1, IV-2 is set to 36 deg, and the secondary side voltages of the two output transformers Tr1, Tr2 are equalized

Imai Kouji

Papers

3-phase inverter

Inverter control system connected to electric power system

Method of controlling dc transmission system using voltage type self-excited inverter

Method of protecting self-excited inverter, power system and interlocking operation

Power supply control system