Abstract: An RF power supply that is capable of tracking rapid changes in the resonant frequency of a load and capable of quickly responding to varying load conditions so as to deliver the desired amount of power. The present invention also provides an RF power supply capable of delivering a wide range of power over a broad frequency range to a load that is remotely located from the power supply.

Abstract: The present invention provides a sputtering power supply apparatus which realizes stable sputtering at a pressure lower than the discharge start pressure, so that scattering of sputtering particles due to collision with sputtering inert gas can be reduced, thereby improving the step coverage and the denseness of the sputter film. According to the present invention, there is provided a sputtering power supply apparatus comprising a sputtering DC power source (A), a constant current circuit (B) connected to the DC power source, a sputtering source (21) connected to the constant current circuit (B), and a control unit (11) for controlling a current output from the constant current circuit (B) so as to be a constant current.

Abstract: A method for providing a regulated core voltage to a processor within a computer system is disclosed. In accordance with a method and system of the present invention, a power supply is provided for a processor that includes multiple core transistors and multiple I/O transistors. An input voltage is supplied to a first power input of the processor for powering the I/O transistors within the processor. This input voltage is also supplied to a second power input of the processor for powering the core transistors within the processor via a voltage regulator and a resistor, with the voltage regulator and the resistor connected in parallel, such that the voltage drop across said voltage regulator can be reduced.

Abstract: A current limiting system for a circuit limits current flow through the system. The current limiting system comprises at least one main switch comprising first and second main switch contacts and a contactor connecting the first and second main switch contacts; at least one current limiting device and at least one solid-state switch, which are mechanically unconnected to the main switch, and the at least one current limiting device and least one solid-state switch are arranged in series on a series side of the circuit; the at least one main switch is on a main switch side of the circuit arranged in parallel with the series side; a control that senses a predetermined condition of the circuit, and operably connected with the at least one solid state switch to open and it. Under normal operating conditions, most current flows through the at least one main switch side. When the predetermined condition causes the main switch to open, and the resistance increases in a main switch side.

Abstract: An electrical circuit for a vehicle comprises a first branch or sub-circuit and at least one second branch or sub-circuit. The first branch or sub-circuit includes the vehicle battery, an electrical generator to be driven by the vehicle's engine or transmission and for charging the battery, a starter motor to be driven by the battery for initiating engine operation, and a number of electrical components operable at voltages equal to or greater than the battery's nominal output voltage. At least one of the second branches or sub-circuits includes a number of other electrical components (e.g. lamps) that are susceptible to damage if the voltage supply thereto is too high, this second branch or sub-circuit being connected to the first branch or sub-circuit via an element, e.g. a diode, providing a substantially constant voltage drop.

Abstract: A device for automatically adapting to the impedance of a supply line to optimally supply a load. The device includes a switched mode voltage regulator from which is drawn a signal to be provided to the load, a regulation loop to adjust the amplitude of the signal to be provided to the load as a function of the line voltage, and means for aligning the output voltage of the voltage regulator with the amplitude of the signal provided to the load.

Abstract: A switch controlled variable capacitor circuit that includes a capacitor having a first terminal and a second terminal; a switch connected across the first and second terminals of the capacitor; a pulse width modulator for controlling the switch to close at positive going zero crossings of a sinusoidally varying current provided to the first and second terminals, and to open at D seconds after the positive going zero crossings, wherein D is in a range of 0.25 to 0.5 times the period T of the sinusoidally varying current; and a diode connected across the first and second terminal of the capacitor for conducting the sinusoidally varying current during a portion of a negative half of each period of the sinusoidally varying current. The switch variable capacitor circuit has a capacitance that is controlled by varying D.

Abstract: An electronic circuit in which resistors R.sub.0 . . . R.sub.n+m are coupled in series with fusible cut-outs Q.sub.0 . . . Q.sub.n+m and in which at least one fusible cut-out Q.sub.n+1 . . . Q.sub.n+m is bridged by an additional resistor R.sub.n+1 ' . . . R.sub.n+m '. Each of the fusible cut-outs Q.sub.0 . . . Q.sub.n+m can be blown from a conductive to a non-conductive state. The total conductance Y.sub.total of the electronic circuit can thus be adjusted by targeted blowing of individual ones of the fusible cut-outs Q.sub.0 . . . Q.sub.n+m.

Abstract: A power converter has two switched capacitor circuits each including at least a plurality of sets of capacitors and switching elements, first of which circuits is provided for supplying a DC power to a load while second of which accumulates a power in a period receiving a higher input voltage, and the first switched capacitor circuit being made to receive, in a period receiving a lower input voltage, a power supplied from a DC power source and also the power supplied from the second switched capacitor circuit for supplying to the load the DC power of a constant voltage, in which an input current collectively taken up by the two switched capacitor circuits is made similar in the waveform to the input voltage to eliminate any harmonics distortion of the current drawn from the source, for attaining the supply of the DC power of the constant voltage to the load, whereby the power converter is rendered not to require any large inductor to be capable of being minimized in size and restraining any noise radiation fr

Abstract: A high-power modulator includes a plurality of means for limiting voltage and a plurality of controllable switches. Each of the switches is connected in parallel with a different one of the voltage limiting means to form a plurality of parallel pairs. Each of the parallel pairs is connected to each other in a series combination. A first parallel pair in the series combination can be connected to a main power source, and a last parallel pair in the series combination can be connected to a load. Each of the switches is switchable from an off or open position to an on or closed position.

Abstract: A circuit arrangement for generating a constant output voltage has a decoupling diode at the output side and has a circuit for actual value formation that is connected to the output of the circuit arrangement. In order, given high precision of the output voltage, to prevent voltages appearing at the user and applied in some other way to the user from causing the regulator to inhibit the circuit arrangement, a reference potential terminal of the regulator lies at one side of the decoupling diode and the voltage divider lies at the other side of the decoupling diode. The circuit arrangement is particularly suited for redundant feed of equipment in electrical communications transmission technology.

Abstract: A system for regulating the transfer impedance of a plurality of current-to-voltage converters to a substantially equal value includes a reference voltage source and a reference impedance for providing a reference current. A reference current-to-voltage converter is responsive to the reference current and provides an output voltage. A comparator is responsive to the reference voltage and the output voltage and provides a control signal to the reference current-to-voltage converter and to all the other current-to-voltage converters to maintain the transfer impedance of all the current-to-voltage converters constant.

Abstract: An interface unit is provided for transmitting signals to and receiving signals from several transmitters. The interface unit includes a DC power supply, an active load, and a transmit/receive circuit connected to the first wire of a two wire circuit which transmits signals to and receives signals from the transmitters. The active load is connected in series with the DC power supply between the first and second wire of the two wire circuit and has a first impedance at DC and a second, higher impedance within a frequency range defined by the signals transmitted to and received from the transmitters.

Abstract: A power control system includes a voltage follower circuit which may be interposed between a load power control circuit which adjusts the level of power applied to a load, and a variable impedance whose internal impedance prescribes the desired level of power. A feedback voltage from the output of the voltage follower circuit is compared with a corresponding voltage across the variable impedance and the difference between them is used to drive the output voltage of the voltage follower circuit toward the input voltage. The voltage follower circuit permits control by a single variable impedance of many more load power control circuits than a single variable impedance can normally handle, and without appreciably affecting the power level as a function of the impedance level. This circuit is particularly useful in a system for controlling the level of light received from fluorescent light fixtures controlled by electronic ballasts.

Abstract: In a variable high-voltage generating circuit for an avalanche photodiode, a pulse oscillating circuit generates pulses, a current driving circuit current-amplifies the pulses, a Cockcroft-Walton circuit boosts and rectifies the pulses from the current driving circuit, and a low-pass filter is connected at the output of the Cockcroft-Walton circuit. The avalanche photodiode is connected in series with a first resistor, and the series connection is connected to receive the output of the low-pass filter. A series connection of a transistor and a second resistor is connected in parallel with the series connection of the avalanche diode and the first resistor. A control circuit applies a variable signal to the base of the transistor, thereby to vary the voltage applied across the APD.

Abstract: A switched resistor regulator is constructed whose duty cycle response is nonlinear with small changes in input control voltage. Specifically, the response of a pulse-width modulator is made to increase less than linearly with small changes in input control voltage. In a preferred embodiment, the pulse-width modulator is altered by comparing the input control voltage with a nonlinear reference signal, rather than the substantially linear reference signal which is used in prior art pulse-width modulators. Specifically, the nonlinear reference signal may be generated by a nonlinear reference voltage circuit, such as an RC charging circuit, or such as a D/A converter controlled by a clocked programmable microprocessor.

Abstract: A circuit arrangement for reducing an interference current produced by a load (2). The frequency of the interference current is considerably higher than the frequency of a supply voltage source (1) which is coupled to the load. In order to reduce the interference current, a compensation circuit is provided comprising at least one connection branch connected in the leads between the load and the supply voltage source and having each time a series-combination of a capacitor and a controlled signal source. Each signal source supplies a current dependent upon a control signal. The control signals are derived from the current flowing in a lead to the connection branch or away from it. The magnitude and the phase of the currents supplied by the signal sources are proportioned so that the interference current flows for the major part through the connection branch.

Abstract: A power supply is provided with a predetermined nonlinear temperature coefficient for float charging sealed lead-acid batteries and providing power to a load. A temperature compensation network in the power supply provides the predetermined nonlinear temperature coefficient by using a linear temperature coefficient element (forward biased silicon diode) and a nonlinear temperature coefficient element (thermistor) in combination. Additionally, an over-voltage protection circuit, to disable the power supply should the output voltage exceed a predetermined value, is disclosed having a second temperature compensation network to compensate for the output voltage variation with temperature of the power supply.

Abstract: An intrinsically safe battery pack arrangement for electrically powering electrical devices is disclosed. The power pack has a device for electronically determining a short in a cable or device and switching off the voltage to the power pack. The electronic device includes a transisterized circuit for sensing and controlling current through the cable. When the current exceeds a predetermined maximum, the circuit limits the current in the cable to a maximum value. The circuit is latched in the off position when the short is present for an extended time and the circuit may be reset after the short is removed and the problem corrected. This form of circuitry in power packs for use with mining equipment such as lamps, provides a unit which will not cause hazardous sparks when shorted thereby constituting an intrinsically safe device for use in mines.