Abstract: A vibrating compressor having ferrite magnets formed into arc-shaped pieces the center angle of which includes 360.degree. and disposed along the internal circumference of a cup-shaped external iron core, a cylindrical magnetic pole facing with the ferrite magnets at a predetermined gap, and an electromagnetic coil vibratably supported by a mechanical vibration system in an annular magnetic gap defined by the ferrite magnets and the cylindrical magnetic pole, wherein magnetic flux density in the annular magnetic gap is maintained uniform by at least making the axial length of the ferrite magnets larger than the length of the cylindrical magnetic pole, and the relative position of the ferrite magnets and the electromagnetic coil is selected so as to ensure the precise switching of drive current flowing through the electromagnetic coil.

Abstract: A vibrating compressor wherein an alternating voltage is applied from a d-c power source to a drive coil vibrating in a magnetic field via a d-c/a-c converter circuit is disclosed. An alternating voltage of a square wave form is applied to the drive coil of the vibrating compressor in such a manner as to avoid the timing at which a counter electromotive force generated in the drive coil intersects with zero level.

Abstract: A refrigerating device having an inverter circuit for generating alternating voltage, a vibrating compressor to which the alternating voltage from the inverter circuit is supplied, a condenser to which the refrigerant compressed by the compressor is supplied, a capillary tube provided on the downstream side of the condenser and an evaporator provided on the downstream side of the capillary tube, wherein a phase control circuit for controlling the phase of the alternating voltage supplied to the compressor in accordance with ambient temperature of the refrigerating device and/or the evaporator temperature is provided to cause the piston stroke of the vibrating compressor to be reduced in accordance with decreases in ambient temperature of the refrigerating device and/or the evaporator temperature so as to prevent unwanted damage to the compressor.

Abstract: A supply voltage monitoring device for an automotive battery comprising an average voltage generation circuit for generating the average voltage of the supply voltage of a battery as a power source for various equipment on board an automobile, a Zener diode conducting when the output voltage of the average voltage generation circuit exceeds the prescribed value, a first transistor connected between the Zener diode and the average voltage generation circuit, a second transistor controlled by the conducting Zener diode, a capacitor controlled for charging and discharging by the output of the second transistor, third transistors controlled by the output voltage of the capacitor, and a light emitting diode controlled for the light emitting state or the non-emitting state by the second transistor or the third transistors, and characterized in that the device is constructed to monitor the supply voltage of the battery by the light emitting state or the non-emitting state of the light emitting diode.

Abstract: An AC/DC power supply device for operating a refrigerator compressor by switching over the AC operation mode in which the compressor is operated from AC power source and the DC operation mode in which the compressor is operated from DC power source through an inverter circuit, wherein a thermostat is constructed so as to be connected to a circuit for supplying DC voltage to the inverter circuit in the DC operation mode, and a switching section is constructed so that high potential points including the potential of the AC power source and low potential points including the potential of the DC power source do not face each other in close vicinity to prevent the AC power voltage from being unwantedly applied to the low voltage side.

Abstract: A voltage regulating device for a power generating system with inverter circuits including two sets of switching elements each of which is alternately on-off controlled, having delay circuits for controlling delay time in accordance with the load voltage, and characterized in that supply voltage to the load is maintained at a constant level by forcibly turning off either set of the switching elements during the period when the said set of the switching elements are to be turned on.

Abstract: A refrigerating system having a compressor; an inverter connected to the compressor for supplying electric energy to the compressor; and an input voltage control circuit provided on the input side of the inverter, wherein the input voltage control circuit generates output voltage signals which change at a predetermined level, including zero level, within a certain temperature range in response to the ambient temperature of the refrigerating system and in accordance with the temperature condition, the voltage thus produced being fed to the compressor via the inverter. The refrigerating system of this invention is, therefore, protected from failure or damage even when placed in an extreme temperature environment, and resumes automatically the supply of power to the compressor when the ambient temperature of the system is restored to the normal temperature.

Abstract: A direct current power supply device for rectifying an a-c voltage of external power supply and supplying d-c power to a battery and/or a d-c load characterized in that it comprises a current detector to detect a current component flowing to the battery, a voltage detector to detect a terminal voltage of the battery, a control circuit controlled by the current detector and the voltage detector, a leakage transformer functioning by external a-c power supply, and a charging converter circuit for supplying d-c power to the battery, the charging converter circuit being controlled by the control circuit and supplied power from the output of the leakage transformer, the control circuit comprising a maximum value detecting circuit to combine output voltage of the circuit detector and the voltage detector, a switching circuit controlled by the maximum value detecting circuit, a pulse generating circuit in which pulse rise time controlled by the switching circuit and a switching control circuit controlled by the pulse

Abstract: An automotive power supply comprising a generator which produces a voltage when an engine is in operation, a main battery which drives a starter motor, an auxiliary battery which functions as a power source for direct current equipment in a vehicle, and a d-c voltage booster circuit which boosts the voltage produced in the generator to supply the auxiliary battery; wherein, in charging the main and auxiliary batteries in parallel by the voltage produced in the generator, the supply voltage to the auxiliary battery is boosted by compensating the line voltage drop between the generator and the auxiliary battery.

Abstract: A low frequency, high output alternating current generating device comprising a high frequency generator having an output winding capable of generating a continuous wave high frequency output with an almost constant amplitude, a rectifying means for rectifying the high frequency output of the output winding, a plurality of condition control means for connecting the output of the rectifying means to a load by time-selectively and alternately reversing the polarity of the output, and a reference signal generating means for applying low frequency control signals to each of the conduction control means regardless of the phase of the high frequency output.

Abstract: An inductor-type high frequency generator with alternating current field excitation and frequency changing output means. An excitation winding provides current for the field winding by way of a rectifier, and automatic voltage regulator and an inverter. In response to generator output the A.V.R. controls the d.c. voltage fed to the inverter.