Abstract: The apparatus and methods of the invention provide conversion of a wide range of utility voltages found worldwide, to a fixed nominal voltage level. The invention therefore provides the ability to "plug in" to virtually any power source, and produce a desired nominal voltage for operation of electrical equipment either alone or in conjunction with a UPS device. The voltage selection apparatus provides standard nominal levels of electrical power to equipment while utilizing power sources of varying voltage and frequency. The device is dynamically adaptive to the input power source, and maintains its output within a nominal range even where the input source varies to a substantial degree. The voltage selection apparatus comprises an input for receiving input AC voltage from a power source, and a transformer to produce an output voltage which is coupled to the input.

Abstract: A power supply converting circuit for eliminating abnormal voltage components, such as an electrical noise component and a surge component, from the commercial alternating current without a transformer and for converting the commercial alternating current into a weak direct current and/or an alternating current having a low voltage to apply the weak direct current and/or the alternating current having a low voltage to a load. A filter filters the commercial alternating current and is connected to main power transmission live lines of the commercial alternating current power. A power level adjusting section receives the filtered alternating current in the filter to convert a power level of the received alternating current. A snubber circuit receives the power level converted alternating current in the power level adjusting section and eliminates the abnormal voltage components of the power level-converted alternating current.

Abstract: A recovery mechanism is provided with an elastic blade for wiping the formation surface of ink discharge ports of a recording head by allowing the leading end of its wiping surface to slide on the formation surface of ink discharge ports of the head, and an ink jet recording apparatus is provided with such recovery mechanism. For this recovery mechanism, a guide wall unit, which is extended to the vicinity of the formation surface of ink discharge ports, is arranged along the wiping surface of the blade in a state that the blade is in a wiping operation, and then, ink adhering to the leading end of the wiping surface of the blade is guided to a gap between the guide wall unit and the blade. In this way, the flying splash of ink at the time of wiping can be suppressed for the assurance of a stabilized wiping operation, thus making it possible for the recovery mechanism and the ink jet apparatus provided therewith to perform a high-quality recording.

Abstract: A circuit for energizing an electroluminescent panel of a portable data collection device is disclosed. The circuit includes voltage step up circuit and a switching circuit. The voltage step up circuit converts a +5 volt DC signal output from power regulation circuitry of the portable data collection device to a +100 volt essentially constant DC signal. The voltage step up circuit includes a switching regulation integrated circuit chip coupled in series to a toroid inductor. The inductor is coupled through a diode to a smoothing capacitor. The switching circuit converts the +100 volt DC signal to effectively a .+-.100 volt (200 volts peak-to-peak), 500 Hertz (Hz) signal across electrodes of the electroluminescent panel. The switching circuit includes a 555 IC timer chip coupled to an H bridge configuration of switching transistors.

Abstract: A clocked current supply apparatus for connection to the network with one or several cables has at least one input rectifier, at least one regulator for generating a sequence of current pulses, at least one adapter network for separately transmitting potential and current pulses and a pair of output terminals for each adapter network to which a voltage-controlling element (accumulator, capacitor) is connected. The adapter network (AN) consists of an adapter transformer (TR) and several blocking diodes (DL,DE) that connect the output terminals (KA+, KA-) to the secondary winding system of the adapter transformer (TR). In addition, a regulator that consists of at least one choking coil (L), at least one pair of electronic switches (ES1,ES2) driven by a controller (STG) and one voltage limiter (BGU) is arranged between the rectifier (GR) and the adapter network (AN).

Abstract: A power supply for automatically supplying a proper voltage to a central processing unit, includes: a voltage detecting pin of the central processing unit for outputting an operating voltage indicating signal; a selector for causing corresponding operating voltage to be inputted to the central processing unit by sensing the voltage detecting pin state outputted by the central processing unit; a power supply which supplies a proper voltage to the central processing unit; and a controller which outputs a control signal so as to supply the proper operating voltage to the central processing unit by determining the type of the central processing unit.

Abstract: The invention relates to a voltage generator including a fuel cell, a d.c. converter and a storage battery, the input terminals of the d.c. converter being connected to the fuel cell terminals and the output terminals of the d.c. converter being connected on the voltage generator terminals in parallel with those of the battery. A microprocessor regulates the maximum intensity value of the current going through the d.c. converter responsive to the voltage measured at the terminals of the fuel cell in order to maintain the voltage near a preset reference value.

Abstract: Due to low output voltage during flyback mode of start phase the secondary current cannot be fully discharged in time. The current buildup will eventually damage the output transistor if the current is not limited.In order to prevent the current build up during start phase, the storage time of the output transistor of the SMPS has to be reduced.During the startup phase a negative bias capacitor is not fully charged. Thereby the base of an output transistor is not biased sufficiently when the transistor is switched off. So the transistor could not operate safely if the collector voltage is higher than Vceo.It is the object to keep charges, which are stored on the capacitor during startup phase and to reduce discharging of the capacitor.According to this invention means are provided between the base and the emitter of the output transistor. It is preferred that said means are realised by a resistor and a diode, connected in series.

Abstract: A circuit arrangement for supplying a constant current which is stabilized against temperature variations. The constant current is produced by a current source which is controlled by a control stage in which a first control current is supplied to each of a first and a second resistor, at least one of which is trimmable. The first control current is controlled so that the difference between the voltages produced thereby across the first and second resistors is in a first predetermined ratio to the constant voltage produced by a reference voltage source. The current source is controlled by the control stage so that the constant current produced thereby is in a second predetermined ratio to the first control currents.

Abstract: A power supply controller implementing frequency foldback and volt-second duty cycle clamp features. An oscillator timing capacitor is charged with a fixed current and is discharged with a fixed current when the output voltage is above a predetermined level and with a decreasing current when the output voltage falls below the predetermined level, so as to decrease the power supply operating frequency during short circuit or overload fault conditions. A volt-second duty cycle clamp circuit limits the duty cycle to a maximum value which is independent of the tolerance of a capacitor which sets the maximum duty cycle as a function of the power supply input voltage.

Abstract: A solenoid coil includes a substantially parallel plurality of conductors on a flexible base. The flexible base is wound around a water pipe, body part or the like to provide a field for the treatment of fluids therein. An alignment mechanism is provided to substantially align a first level of parallel conductors to the next level of parallel conductors above the first level. Each wrap of the flexible base provides a number of conductor turns equal to the number of parallel conductors. In a second embodiment, a substantially parallel first plurality of conductors and a substantially parallel second plurality of conductors are disposed on a flexible base. A return conductor is provided on the flexible base to connect the first plurality of conductors to the second plurality of conductors. When wound around a fluid carrying pipe, the return conductor is disposed up flow (i.e.

Abstract: In a synchronous rectifying circuit comprising a main transformer, a primary circuit, a secondary circuit, and a control circuit, the secondary circuit includes a synchronous rectifier which comprises not only a second series circuit comprising first and second synchronous rectifying elements but also first and second impedance circuits. The first impedance circuit is inserted between an end of a secondary winding of the main transformer and a first control terminal of the first synchronous rectifying element. The second impedance circuit is inserted between another end of the secondary winding of the main transformer and a second control terminal of the second synchronous rectifying element. Each of the first and the second impedance circuits may consist of a parallel circuit comprising a resistor and a diode. Each of the first and the second impedance circuits may a capacitor.

Abstract: A variable power source is provided having multiple power modules each of which can produce a portion of the total range of voltage required for pulsed operation of an electromagnetic acoustic transducer electromagnet. The power modules are connected in series, and controlled by individual potentiometers which are simultaneously adjusted. Selector switches are provided for enabling or disabling each module. The output of the power modules is connected to a pulser/controller for wave forming prior to sending the output signal to the electromagnet. A noise filter can be placed between the power modules and the pulser. LED-type indicators on the selector switches may be used to indicate the operational status of the modules.

Abstract: A slide switch 1 includes a movable contact 2 that has projections 11 formed thereon for preventing dislocation. The movable contact 2 is inserted together with a spring 8 into a holder 3. The holder 3 has regulating recesses 12, within which the projections 11 of the movable contact 2 can move only vertically. The holder 3 also has claws 9. The movable contact 2 has holes 10 that engage with the claws 9. A pole plate 4 has fixed contacts 5 fixed thereon, on which the movable contact 2 can slide with the holder 3 in compressive contact with the fixed contacts to switch the contact positions. At least one of the fixed contacts 5 is formed with a chamfer 15. Resin guide members 18 are fitted in the centers of slits 17 in the pole plate 4 for preventing the movable contact from falling into the slits. This structure prevents the movable contact of the slide switch from being dislocated when the contact positions of the slide switch are switched, and increases the durability of the slide switch.

Abstract: A line terminator (1) having a circuit board (8) with at least three circuits, and including a voltage regulator (2) combined with a voltage divider circuit and a noise reduction circuit path (17). The noise reduction circuit path (17) is coupled to two spaced apart high frequency capacitors (28a,28b), and the noise reduction path is apportioned to extend equally between the pair of spaced apart capacitors (28a,29b) and generally circumscribe the remaining circuits of the circuit board (8).

Abstract: A power regulation circuit features an improved regulation circuit for use with a voltage multiplier circuit, such as a Vccp pump for a DRAM. The power regulation circuit includes: a high-gain differential comparator, dual input level translators, and a constant current bias generator. The dual input level translators lower the respective voltage levels of a reference voltage level and the output of the power regulation circuit, which is monitored to provide the desired regulation. The translated input signals are coupled as inputs to the differential comparator. Translation keeps the inputs within the input common mode range of the differential comparator. The differential comparator acts in concert with the constant current bias generator to regulate the output of the power regulation circuit at a constant and steady level.

Abstract: A shunt includes an integrally formed, continuous elongated flat plate body with two contact end portions and a curved intermediate portion which links the contact end portions and which has a constant width. The plate body has a thickness of about 1 to 2 mm and is symmetrical with respect to an axis which extends between the contact end portions. The curved intermediate portion includes at least two parallel straight segments and at least one curved bridging segment that links adjacent ends of two of the straight segments. Adjacent ones of the straight segments form a distance of about 1 to 2 mm therebetween.

Abstract: A power regulation circuit features an improved regulation circuit for use with a voltage multiplier circuit, such as a Vccp pump for a DRAM. The power regulation circuit includes: a high-gain differential comparator, dual input level translators, and a constant current bias generator. The dual input level translators lower the respective voltage levels of a reference voltage level and the output of the power regulation circuit, which is monitored to provide the desired regulation. The translated input signals are coupled as inputs to the differential comparator. Translation keeps the inputs within the input common mode range of the differential comparator. The differential comparator acts in concert with the constant current bias generator to regulate the output of the power regulation circuit at a constant and steady level.

Abstract: A motor operator unit for an electrical switch is pivotally mounted on a bracket to swing between a closed, operative position in which an actuator in the motor operator unit engages the switch handle for electrical operation of the switch handle and an open position in which the switch handle is freely accessible for direct manual operation. The compliant actuator which is translated by a motor driven threaded shaft overtravels at each end of its reciprocal path after actuation of the switch handle to toggle a single power switch which determines both direction and shutoff of motor operation. A lockout plate mechanically prevents electrical and manual operation of the switch handle and carries an interlock switch which only enables motor operation when the motor operator unit is in the operative position and not locked out.

Abstract: A continuous linear contact switch is provided. The continuous linear contact switch includes first and second resilient strips, each having first and second longitudinal edges, an outer surface and an inner surface. The respective first and second longitudinal edges of the first and second resilient strips are joined to each other at first and second seams along an entire longitudinal length thereof. Beads are located along the seams on the inner surfaces of the first resilient strip so that the first resilient strip remains generally flat and the second resilient strip is arched to form an inner cavity between the generally flat first resilient strip and the arched second resilient strip. A first flexible, electrically conductive strip is located on the inner surface of the first resilient strip. A second flexible, electrically conductive strip is located along the inner surface of the second resilient strip, spaced from the first flexible, electrically conductive strip.