Abstract: An arbitrary input AC voltage is applied from an external power supply (1) to a rectifying circuit (2), and one rectifying output end of the rectifying circuit is connected to a switching element (4) through a coil (3), while the other rectifying output end of the rectifying circuit is connected to a common terminal of the switching element through a detecting circuit (5) for a current waveform. Further, a peak value wave detecting circuit formed of a diode (6) and a capacitor (7) is connected in parallel with the switching element (4) so that a step-up chopper circuit is formed. A detecting circuit (10) for an output voltage having two resistors (9a), (9b) is connected between both ends of this capacitor (7). The one rectifying output end of the rectifying circuit (2) is connected to a detecting circuit (11) for an effective voltage value, and the two resistors (9a), (9b) for detecting the output voltage of the detecting circuit (10) are selected by a detecting signal of the detecting circuit (11).

Abstract: A reference voltage generating circuit outputs a reference voltage (used for comparison of magnitude with an analog voltage) at a plurality of levels by using a differential amplifier to amplify voltages at nodes formed by mutually adjacent resisters among a plurality of resistors comprising a ladder resistor unit which is optionally selected by a decoder and an analog switch unit.

Abstract: The present invention describes a resistance reference circuit that includes a reference resistor that is substantially independent of temperature variations to which the resistance reference circuit is subjected. Also provided is a resistor network that may be dependant upon the temperature variations, and a current source circuit that provides first and second currents to the reference resistor and the resistor network. A circuit that is responsive to voltages developed across the reference resistor and the resistor network modifies the resistance value of the resistor network such that its resistance value is maintained the same as that of the reference resistor.

Abstract: A rechargeable/portable multi-voltage DC power supply includes an Ni-Cd rechargeable battery set connected to a switching power supply converting circuit, a pulse width modulation circuit, and a filter circuit for providing a regulated output voltage from the filter circuit. A button switch cooperates with a selection circuit and a feedback ratio circuit for selecting a specific output voltage from a plurality of available output voltages. A plurality of light emitting diodes are connected to the selection circuit for indicating the value of the output voltage.

Abstract: A transportable loading device assembly includes a low-voltage small-capacity variable loading device having a load change-over element which enables the load to be applied to be incrementally variable, a transformer connected to the variable loading device, and a power input terminal provided for the variable loading device or transformer. The assembly further includes a plurality of a high-voltage small-capacity fixed loading devices having respective power input terminals and connected in parallel with the variable loading device, and fans located adjacent to and associated with the variable loading device and the fixed loading devices. The power generator can be tested by controlling the load applied thereon by controlling the load change-over element and controlling the inputs applied to the variable loading device and a plurality of the fixed loading devices.

Abstract: A main ladder attenuator has a series of resistors and switches for connecting corresponding resistors to an output. The controller has an auxiliary ladder attenuator connected to the main ladder attenuator in series and having a series of resistors and switches. Each of the resistors of the auxiliary ladder attenuator is provided for interpolating between the adjacent resistors of the main ladder attenuator.

Abstract: Apparatus for controlling rate of battery current discharge, comprising, variable means applying resistance load to the battery output, comparator means connected for defining and communicating a targeted battery discharge current level set point, sensor means connected for sensing the rate of current discharge from the battery, and connected to the comparator for comparing the actual battery discharge current rate to the targeted battery discharge current, and adjusting means connected to the variable means and operative responsively to the comparitor means for incrementally increasing or decreasing the resistive load in response to signals from the comparator means as to whether the battery discharge current exceeds the targeted current set point.

Abstract: An RF power control circuit for dividing a DC voltage by a plurality of resistors, selecting one of the partial voltages, and using the selected voltage as a reference voltage, thereby obtaining a multilevel RF output, has first and second switching circuits, controlled by an identical selection signal, each for selecting one of the partial voltages obtained by the resistors and outputting the selected voltage, and a selecting circuit for selecting one of outputs from the first and second switching circuits in accordance with a control signal.

Abstract: There is disclosed a diode snubber for the voltage transients generated in the parasitic inductance of a switched resistor when current therethrough is interrupted. Also disclosed is the use of such a diode snubber in: a series switched resistor regulator; a shunt switched resistor regulator; a hybrid switched resistor regulator and a passbank switched resistor regulator. Also disclosed is the use of a linear dissipative regulator in all these forms of switched resistor regulators to maximize the effiency of power delivery to the load.

Abstract: There is disclosed a diode snubber for the voltage transients generated in the parasitic inductance of a switched resistor when current therethrough is interrupted. Also disclosed is the use of such a diode snubber in: a series switched resistor regulator; a shunt switched resistor regulator; a hybrid switched resistor regulator and a passbank switched resistor regulator. Also disclosed is the use of a linear dissipative regulator in all these forms of switched resistor regulators to maximize the efficiency of power delivery to the load.

Abstract: A constant-voltage regulated power supply circuit has an input circuit and an output circuit. The sense circuit includes a programmable sense circuit that further includes a divider network with a plurality of selectable tap points and a multiplexer having a plurality of inputs and an output with each tap point being connected to an individual input of the multiplexer. A controllable pass element is operatively connected in the power supply circuit between the input circuit and the output circuit. A comparator connected to receive inputs from a selected tap point and a reference voltage generating circuit provides an output to control the controllable pass element.

Abstract: A switched resistor regulator controls current flow through a resistor electrically connected to a load by varying the duty cycle of switching the resistor into electrical connection between of a power source and the load to regulate the power to the load. Both current and voltage regulation can be achieved. In a series switched configuration, current flow through a resistor in series with the load is controlled with current flow being maintained by a capacitor is parallel with the load when the resistor is switched off. In a shunt switched configuration current flow through a resistor in parallel with the load is controlled, with a capacitor parallel to the load also being used. In a hybrid configuration a shunt switched resistor is used while the current level to the load is changed by selecting one of several series resistors; a capacitor is also provided parallel to the load.

Abstract: A switched resistor regulator controls current flow through a resistor electrically connected to a load by varying the duty cycle of switching the resistor into electrical connection between of a power source and the load to regulate the power to the load. Both current and voltage regulation can be achieved. In a series switched configuration, current flow through a resistor in series with the load is controlled with current flow being maintained by a capacitor is parallel with the load when the resistor is switched off. In a shunt switched configuration current flow through a resistor in parallel with the load is controlled, with a capacitor parallel to the load also being used. In a hybrid configuration a shunt switched resistor is used while the current level to the load is changed by selecting one of several series resistors; a capacitor is also provided parallel to the load.

Abstract: An acceleration power supply includes a series-connected semiconductor switches with voltage dividing elements and another semiconductor switch coupled in series to the series-connected semiconductor switches for cutting off a power supply line connected to a load of the apparatus. The series-connected semiconductor switches and cutting-off semiconductor switch have a function of a series regulator.

Abstract: A temperature controller applied to flat heating equipment, such as an electric blanket, is disclosed wherein power supply control to a heater wire in the blanket is performed, using a predetermined temperature as a target temperature which is corrected to be higher than a desired temperature preset by a user, in an initial period after the electric blanket is started. Power supply to the heater wire is temporarily increased, thereby rapidly warming the blanket, which has a low heat conductivity, and shortening the time interval until the blanket is heated to the desired temperature.

Abstract: A circuit, for providing a periodic signal of programmably controllable amplitude, includes an oscillator having a substantially constant amplitude signal of desired frequency and waveform at an output thereof connected to the input of a first programmable voltage divider having its output connected to one input of an operational amplifier. The remaining operational amplifier input is connected to the output thereof via a second programmable voltage divider used as a programmably controllable feedback network. The operational amplifier output signal amplitude may be controlled by external data signals to values less than, equal to, and greater than, the substantially constant oscillator waveform amplitude. Both computer and hard-wired circuitry for controlling the output signal are disclosed. An isolation-and-rectification network may be used to recover a D.C. voltage of programmably controlled amplitude.

Abstract: A plurality of metal resistance elements and a metal resistance element for compensation use are formed on a common substrate and placed under the same temperature condition. A reference current is applied to the metal resistance element for compensation use to yield an auxiliary reference voltage. A plurality of switches are individually connected in series to the reference metal resistance elements and the auxiliary reference voltage is provided to the series circuits to selectively control the switches, thereby obtaining various currents.