Abstract: In a radio frequency switch, a pair of diodes is coupled in series with polarities opposed between input and output ports. A shunt diode is coupled between the junction point of the pair of diodes and a point of reference potential. A transistor has its main conduction path coupled between the junction point and the point of reference potential. When the switch is to couple a signal between the input and output ports, a control arrangement applies bias tending to forward bias the pair of diodes, to reverse bias the shunt diode and cut off conduction through the transistor.

Abstract: An electrical switching system for adjusting the brightness of the dashboard lights of a motor vehicle includes a switch provided with a switch lever, for switching between low beam and high beam. Improvements are made whereby the brightness and dazzle-free character of the dashboard lighting can be adjusted with regard to the situation of low beam or high beam. This is achieved in that a switch between brighter dashboard lighting and less bright dashboard lighting is provided which is associated with a switch lever which can be moved to "high beam" and "low beam" positions. Dazzling of the driver due to excessively bright dashboard lighting, and lack of visibility due to inadequately bright dashboard lighting are avoided.

Abstract: This invention relates generally to ornamental lighting controls and particularly to a lighting control for Christmas tree lighting having preferably at least four duty cycle outputs and wherein the duty cycle pattern of each output differs, with respect to a predetermined time interval, from the duty cycle pattern of each of the other outputs of the control thereby to produce, in a plurality of ornamental lighting strings respectively connected to the outputs of the control, a coordinated condition of continuously changing light intensities between strings that occur in predetermined sequential time differing order to result in an overall lighting effect totally unobtainable by any other form of light controlling apparatus.The present device is an improvement over applicant's U.S. Pat. Nos.

Abstract: A circuit arrangement for large power transformers with a low-voltage winding, a main high-voltage winding and a step winding as well as a step switching device at a Y-point side thereof, includes, at a location between a point connecting the step winding to the high-voltage main winding and the Y-point of the transformer, a capacitor in series with a resistor is connected electrically parallel to respectively current-carrying steps of the step winding, the capacitor and the resistor being of such dimensions as to decrease resonance amplitudes of the connecting point to ground, the capacitor being constructed of spirally wound strip lines formed of a resistance alloy, the strip lines being also of such dimensions as to reduce resonance amplitudes of the connecting points.

Abstract: A power supply system includes a main power unit for supplying power necessary for the operation of an electronic apparatus including a memory, an auxiliary power unit for supplying power necessary for retaining the memory contents, and a battery serving as a back-up of said main and auxiliary power units for supplying power necessary for retaining the memory contents. The memory is supplied with power from the main power unit when it is in the power-on state, from the auxiliary power unit when the main power unit is in the power-off state, and from the battery in the event of a.c. power failure.

Abstract: A power supply control device for a copier of the type having a timer therein is disclosed. The device allows a power supply of the copier to be turned on and off at any desired time which is set through ten keys. Data entered through the ten keys are loaded in a store. The data read out of the store and present time data output from the timer are compared and, as they compare equal, a power supply driver turns on the power supply. Guidance displays are referenced in the event of entering data.

Abstract: The electric vehicle driven by a DC motor having a field winding. An electric resistance element can be switched into parallel circuit with the field winding to weaken the field and increase potential motor speed. A relay operates the switch, a Hall-effect switch responsive to motor rotation produces voltage pulses indicative of motor speed. A microcomputer counts pulses in a given time period to determine motor speed and compares the speed with that in the prior period to determine whether the motor speed is increasing or decreasing. The computer is programmed to operate the relay to close the switch as the motor speed increases above a first speed and to open the switch as motor speed subsequently decreases to a second speed lower than said first speed. The computer is programmed to respond to a third speed greater than the first speed to operate the relay to open said switch to prevent overspeed.

Abstract: A fire prevention system useful for controlling actuation of equipment such as combustion or heating devices used in food preparation. The system according to this invention includes a fire alarm circuit and a timer circuit which automatically shuts down energy supplies to such equipment either in response to the detection of a fire, or during preselected periods of scheduled inoperation of the equipment. The system, therefore, in addition to operating as a fire alarm, reduces the likelihood that a fire will be started when equipment is unattended. The fire prevention system according to this invention further includes a manually operated override circuit which restores energy supplies to the controlled equipment irrespective of the control signals provided by the fire alarm circuit and timer.

Abstract: An uninterruptible power supply (10) includes a backup power supply (50) mounted on a circuit board type base (30) and connected to a universal buss (40) which is also mounted on the base to be in parallel with a main power supply which is also connected to the universal buss. A plurality of voltage controllers (60) are also mounted on the circuit board and each connects the universal buss to an output terminal (64) whereby a plurality of different elements can be connected to the uninterruptible power supply and each element can have a voltage requirement which is different from the voltage requirements of the other elements. A signal control (96) is also included to visually, audibly and/or digitally indicate impending run-out of battery power.

Abstract: A control system capable of improving a disturbance response characteristic, includes a control processing unit and a power converter. The control processing unit includes apparatus for (a) providing a signal A equal to a predetermined transfer function G.sub.X (s) of a detected value of a controlled variable n, (b) providing a signal B equal to a transfer function [1+G.sub.X (s).multidot.G.sub.LH (s)] of a first command value, and (c) providing, as a second command value, a difference T* between said A and B signals, where G.sub.LH (s) is a simulated transfer function which is from T* to n. The power converter controls the controlled variable according to the second command value.

Abstract: A switching control circuit has first and second output terminals, the first output terminal being connected by way of a control resistor to one of a pair of input terminals which, in use of the circuit are connected to an electrical power source, the second output terminal being connected to the other input terminal.

Abstract: An image processing apparatus has a memory for storing codes representing types of input image data and a comparator for selecting one of a number of threshold patterns in accordance with the code and comparing the input data with the selected threshold pattern to produce an image signal.

Abstract: An electric device for driving a rotatable mass having a high inertia, said device comprising an electric motor supplied with power by a low-voltage dc source through an electronic energy converter supplying power to the armature (11) of the motor; the field system of the motor (12) comprises magnets (14) and excitation coils (16), the electric conductor of a coil being wound around its pole piece (18) along surfaces parallel to the corresponding yoke portion (19); this device further comprises an electronic system for regulating the current in the coils (16) and capable of maintaining during accelerations and decelerations a maximum output voltage of the converter within a wide range of speeds and therefore a maximum power; the increase in the intensity of the current in the coils (16) progressively decreases the torque coefficient of the motor which is maximum when the coils (16) are not supplied with power.

Abstract: Power is fed to a plurality of loads by a respective plurality of circulating current type cycloconverters connected to an ac power supply. A power compensating capacitor common to the cycloconverters is provided at the ac power receiving-end to deliver a leading reactive power to the ac power supply. Further, each cycloconverter is provided with means for delivering a circulating current and means for delivering a circulating current command value to the circulating current control means. A lagging reactive power corresponding to the leading reactive power by the power factor compensating capacitor is delivered to the ac power supply. The power factor compensating capacitor may be configured so that its capacity is variable by changing the number of stages connected. In addition, the circulating current command value may vary depending upon the peak value of the current flowing in each cycloconverter.

Abstract: A safety device to prevent a vehicle-loaded electronic equipment from malfunctioning due to an influence of the high-level electric field. An antenna pattern for detecting the electric field is formed on the same printed board as the electronic equipment, and an electric signal level of the output from the antenna pattern is determined. When the determined level reaches a level at which the electronic equipment may malfunction, the equipment is forcibly controlled toward a safety range of operation.

Abstract: This invention is a coin operated switch which may be incorporated into coin operated machines such as video games to reduce cheating of the credit granting feature of the machines. This invention incorporates two electromechanical switches and circuitry which further use the existing machine circuitry to time the travel of a coin between the switches and to grant a credit on the machine only if each switch is tripped and released in the proper order and within the predetermined elapsed time.

Abstract: An autonomous uninterruptable power supply apparatus utilizing a digital processor unit as a control and monitor unit to measure and control input and output parameters in the power supply. A battery charger is utilized to maintain the voltage and current levels with the backup battery supply source which powers an inverter unit that converts the DC power to an AC output.

Abstract: A pulse width modulated DC motor operating system is disclosed which reduces the communication back to the power supply of transient spikes caused by the switching characteristics of the freewheeling diode. The switched current path comprises, in series, a DC power supply, a low pass filter including charge storage means, a DC motor armature, a FET and a resistor. A freewheeling diode is connected across the motor armature. PWM signal generating apparatus switches the FET to control average motor armature current. A capacitor is connected across the FET and diode with minimal lead length to reduce stray inductance.

Abstract: An electronic switch of the type having two external lines, one of which is connected to one pole of an operating voltage source in series with a load and the other of which is connected with the load. The switch comprises a sensor, e.g. an oscillator, responsive to proximity of an object thereto and has an output transistor operated by the sensor with blocking and conductive states selectively controlled by the transistor in response to the oscillator. A MOS-FET power transistor is in series with the output transistor and, to reduce the voltage drop in a conducting state of the electronic switch, a self-conducting MOS-FET is used as the MOS-FET power transistor.

Abstract: A machine controller having start and time delay functions activated and set by a single switch. There is a cycler for activating and deactivating machine functions in a timed sequence. There is a manually operable start/delay-set switch and an electronic circuit responsive to the switch which produces a start signal upon initial closing of the switch, and which produces a delay signal after the switch is held closed for a predetermined time. An electronic control circuit responds to the start and delay signals to store a delay time and activate the cycler after the stored delay time has expired.