Abstract: A control apparatus with connecting terminals which are in part connected to serve a plurality of functions. The control apparatus has at least one memory and can be especially for a control apparatus of an electronic internal combustion engine control wherein an additional voltage source for the memory is provided via at least one output terminal accommodating at least one function.

Abstract: In this transducer, for converting an analog input signal into an analog output signal whose level corresponds to the level of the analog input signal, there are included: an A/D converter for converting the analog input signal into a digital signal; an input device comprising a plurality of switches; an upper limit setting means for setting an upper limit value for the analog input signal, according to operation of the switches; a lower limit setting means for setting a lower limit value for the analog input signal, according to operation of the switches; a storage device, for storing a current value of the digital signal output by the A/D converter; a comparison means for comparing the current value of the digital signal output by the A/D converter as converted from the analog input signal, and the upper limit value and the lower limit value, all of which are stored in the storage device; an output means for producing an output when the comparison executed by the comparison means indicates that the current

Abstract: A generator for subjecting an electrical apparatus to a surge voltage. The generator includes a surge voltage generator, a line isolation surge filter, wave shaping circuits and a rectifier coupling network for coupling the surge voltages in shunt with the power line and the equipment under test.

Abstract: A solid state digital and analog circuit which is connected between a two-way radio, public address system etc. and the battery in a police car, emergency vehicle, tow truck or fire truck to prevent the same from inadvertently draining all the power from the battery when the vehicle is left unattended for long periods of time. When the ignition is turned off, a timer in the circuit begins counting and after a prescribed amount of time, e.g. between one and twelve hours, a relay disconnects the auxiliary equipment from high current of the battery. When the ignition is turned on the circuit immediately re-connects the auxiliary equipment and the battery.

Abstract: This invention relates to an electric fence energizer, including: two or more transformers, the primary windings of said transformers being connected to the main circuitry of the energizer and the secondary windings of the transformers being connected to an electric fence, the main circuitry including: a control circuit connected to the primary windings, said control circuit being responsive to the load upon the primary windings or secondary windings detected within the energizer; two or more energy generating devices connected to said control circuit and respectively controlled by said control circuit, said energy generating devices being also connected to the primary windings of the transformers, said control circuit being operative to active the energy generating devices in accordance with the load upon the energizer.

Abstract: A pulse generator having a plunger for actuating several contacts. The plunger is guided in a housing and is slidable in the direction of and rotatable about its longitudinal axis against the action of a spring and is provided with at least one actuating member capable of entering into non-positive engagement with at least one contact both in at least one of its longitudinally adjusted positions and in at least one of its rotated positions. The plunger has a hole which runs parallel to the direction of sliding and contains a second plunger which is slidable and/or rotatable against the action of a spring associated therewith. There is an actuating member on the second plunger.

Abstract: A high voltage pulse clipper for stabilizing the amplitude of successive pulses applied, for example, as modulator pulses to a microwave transmitter. A source of such pulses has its output connected across a capacitor through a series diode whereby the capacitor charge acts as a back bias for the diode. The ground potential side of the capacitor includes a circuit which adds a voltage in opposition to that extant across the capacitor to equalize the capacitor error voltage resulting from variations of the input pulse amplitude and pulse spacing.

Abstract: A print pulse control and driver circuit for an electrostatic fluid jet applicator is provided which promotes enhanced image quality by adjustably controlling the rising and falling edge duration of print pulses that are applied to the applicator's charge electrode array. The control circuit in pattern printing applications employs a print pulse drive bus which is shared by a large number of high voltage charge electrode drive circuits. Print pulses present on the bus are selectively used to gate high voltage to individual charge electrodes. In addition, the print pulse control circuit includes circuitry for detecting short circuits on an individual electrode basis.

Abstract: An circuit arrangement acts in response to an external wake signal to provide fail-safe, battery saving control to a power supply. The arrangement includes a power supply, a microcomputer which is responsive to the external wake signal for providing a shutdown indication to indicate when the power supply should be disabled, and a power supply controller which is responsive to the external wake signal and to the shutdown indication for controlling the inactivation of the power supply. The controller validates the shutdown indication by comparing it to the status of the wake signal so as to provide fall-safe power supply control.

Abstract: A pulse generator comprises a capacitor, means for periodically discharging the capacitor to generate pulses of electricity and means for recharging the capacitor between pulses. Means is included for sensing a residual reverse polarity charge on the capacitor after generation of a pulse and for using the energy stored in it to assist in recharging the capacitor for the next pulse.

Abstract: A circuit arrangement for generating high voltage pulses from DC voltage. The circuit includes a transformer comprising at least two primary windings and secondary windings, in which the primary windings are serial connected with at least one diode, a switching circuit and a voltage source. A first capacitor is connected in parallel with the first primary winding and diode, and in series with the secondary primary winding. The switching circuit is formed from the emitter-collector-section of a switching transistor. The output of a transistor amplifier is connected to the base of the switching transistor. The input of the transistor amplifier is coupled with the output of a control circuit. Two serial connected resistors are inserted between the input of the transistor amplifier and the output of the control circuit. The emitter-collector-section of a first transistor is connected to the common terminal of both the resistors. A voltage divider is connected to the base of the first transistor.

Abstract: A circuit is disclosed which provides power isolation between the initializing and driven circuit, allowing the logic of a wide pulse width signal to be effectively transmitted across pulse transformers and faithfully reproduced.

Abstract: A method of and apparatus for exciting harmonic generation of radio frequency in a tank resonant circuit by bipolar spaced, half-cycle pulses, wherein the period of the tank resonant frequency oscillations is 1/N the period between successive pulses of similar polarity, where N is an odd integer greater than unity.

Abstract: The present invention discloses a programmable pulse generator comprising a digital information processing system generating first and second program-controlled signals; a first digital-to-analog converter coupled to the digital information processing system, generating a first current signal in response to the first program-controlled signal; a second digital-to-analog converter coupled to the digital information processing system, generating a second current signal in response to the second program-controlled signal; and a differential amplifier having a feedback resistor, coupled to the first and second digital-to-analog converters respectively, and generating a pusle signal in response to the first and second current signals wherein the voltage and pulse width of the pulse signal are responsive to the first current signal, and the slew rate of the pulse is responsive to the second current signal.

Abstract: An impulse high voltage generator includes a step-up transformer for stepping up a voltage from an AC power source, a thyristor connected with a primary winding of the transformer for controlling the AC voltage from the AC power source by a firing angle, a full-wave rectifier and a capacitor which are connected with a secondary winding of the transformer, and a discharging resistor connected through a high-speed switching element to the secondary winding. The thyristor is turned on at a firing angle in accordance with a frequency which is set by a setting device for setting an impulse high voltage occurence frequency so that the capacitor is charged, while when the thyristor is turned off, the high-speed switching element is turned on to discharge the capacitor so that an impulse high voltage is generated across the discharging resistor. The impulse high voltage generator can vary a peak value and the occurrence frequency of the impulse high voltage simply and inexpensively with high efficiency.

Abstract: A circuit for providing a DC isolation between a pulse generator (E) and a load (CH) of the kind comprising a primary circuit (2), a secondary circuit (4) and at least one magnetization current elimination circuit (12) on the secondary side, characterized in that it is provided on the primary side with at least one unidirectional transmission circuit (15) which causes the pulses to pass and causes the magnetization current forcibly to be dissipated through the secondary in the circuit (12) for eliminating the said magnetization current and with at least one circuit (18) for attenuating the transient phenomena due to the commutation thus protecting the pulse generator (E).

Abstract: In a magnetic modulator circuit (13) for a radar system, a switching reactor arrangement comprising a switching reactor (17) including input and output coils (respectively 16 and 36), the low side (16') of the input coil (16) being electrically connected to a capacitor (41) through reactor 39, said switching reactor effective for driving a pulse forming network (53), and said capacitor (41) being effective for resetting the switching reactor (17) into saturation with a linear inductor (15) spanning the input coil (16) of the switching reactor (17).

Abstract: In this three-phase filter circuit system for static converter systems and particularly high-voltage direct-current short ties, at least two high-pass filters are provided which are connected in parallel. Each high-pass filter consists of a choke connected in parallel with a resistance and, in series with both, a capacitor and can be individually connected to the three-phase busbar via a switch. The filter circuits are used not only for reducing harmonics but also as compensating devices, which can be switched in steps, for the reactive power requirement of the static converters so that in the lower partial load range of the system one of the filter circuits is disconnected for reasons of reactive power balance. In order to improve the filtering effect in this lower partial load range, a bus-coupler switch connecting in each case the common junctions of capacitor, resistance and choke of the high-pass filters is closed.

Abstract: An apparatus and method is disclosed that produces a high powered sub-microsecond pulse. The present invention utilizes a set of parallel high speed switches and drivers to switch a Darlington Pulse forming network that is charged by a resonant charging circuit. The Darlington Pulse forming network produces a negative pulse which is inverted in a coaxial inverter and then amplified in a coaxial line transformer to provide the high powered short duration pulse signal.

Abstract: A high-repetition rate switch for delivering short duration, high-power electrical pulses from a pulsed-charged dc power supply. The present invention utilizes a microwave-generating device such as a magnetron that is capable of producing high-power pulses at high-pulse repetition rates and fast-pulse risetimes for long periods with high reliability. The rail-gap electrodes provide a large surface area that reduces induction effects and minimizes electrode erosion. Additionally, breakdown is initiated in a continuous geometric fashion that also increases operating lifetime of the device.

Abstract: In the disclosed circuit arrangement for operating the load from alternating current lines, an inductance connected to the load serves as a first energy store. A first control switch switches the energy storage on and off in response to a regulator circuit. A second control switch connected across the inductor and a series current sensor responds to the control circuit to supply current to the load through a diode which prevents current from flowing directly from the power lines.

Abstract: An inductive storage circuit for generating high voltage pulses includes a quenching circuit and a discharge circuit each connected in parallel with a storage inductor. One branch of the quenching circuit includes a quenching capacitor and one branch of the discharge circuit includes a resistor and a diode in series. These two branches have a common junction, to which is connected a quenching thyristor that forms the second branch of each of the quenching and discharge circuits. Thus, the quenching thyristor is in series with each of the quenching capacitor and the discharge resistor.

Abstract: The multilevel inverter includes a voltage divider which when connected across a dc source E.sub.D, provides voltage at terminals having values between +E.sub.D to -E.sub.D. A first and a second set of thyristors pairs are connected between the positive or negative terminals, respectively, and a load terminal for applying selected voltage levels to the load. Any thyristor pair in these sets may be turned-off by firing the thyristor pair at the next highest voltage level. However, the main thyristors which are connected to the +E.sub.D or -E.sub.D terminal is turned-off by a commutation circuit. This circuit includes a single capacitor maintained at zero voltage and subjected to an oscillating voltage during the commutation cycle to turn-off the conducting main thyristor. Such an inverter can easily provide a waveform having a series of pulses at one or more voltage levels thereby eliminating harmonics in the output.

Abstract: An AC resonant charger for a capacitive load, such as a PFN, is provided with a variable repetition rate unrelated to the frequency of a multi-phase AC power source by using a control unit to select and couple the phase of the power source to the resonant charger in order to charge the capacitive load with a phase that is the next to begin a half cycle. For optimum range in repetition rate and increased charging voltage, the resonant charger includes a step-up transformer and full-wave rectifier. The next phase selected may then be of either polarity, but is always selected to be of a polarity opposite the polarity of the last phase selected so that the transformer core does not saturate. Thyristors are used to select and couple the correct phase just after its zero crossover in response to a sharp pulse generated by a zero-crossover detector. The thyristor that is turned on then automatically turns off after a full half cycle of its associated phase input.

Abstract: A pulsed power supply for driving an X-ray tube is described. Four p.f.n. devices are coupled in pairs to respective transformers and the individual devices supply pulses of relatively short duration to their respective transformers. Each pulse supplied by one device is followed by a pulse supplied by a device of the other pair, and pulses supplied by all of the devices in sequence are combined to produce a pulse of relatively long duration for application to the tube.

Abstract: A circuit for electronically generating chime-like tones wherein an oscillator circuit output is passed through a diode bridge having another diode across the D.C. terminals thereof and poled to be conductive. The resultant tone is distorted to considerably increase its harmonic content. Further to obtain the desired decoy characteristics a capacitor is included in series with said other diode to thus decrease the current through said bridge as the capacitor becomes charged.

Abstract: This invention relates generally to power inverting devices and more particularly, to static inverting devices which produce an output wave shape which closely approximates a sine wave.