Abstract: A circuit wherein a current sensing device is incorporated in an AC input line. An AC output is taken from the output of the current sensing device and from an other AC input line. Circuitry including a capacitor coupled bi-directional switching regulator and an energy storing capacitor adds current to or subtracts current from the instantaneous output load current. The arrangement is such that the AC output is equal to the AC input with no regulation effect. Substantially one hundred percent efficiency results when very little power factor correction is required.

Abstract: A circuit wherein a current sensing device is incorporated in an AC input line. An AC output is taken from the output of said current sensing device, and from an other AC input line. Circuitry including a bi-directional bridge rectifier followed by a bi-directional switching regulator and an energy storage capacitor adds current to or subtracts current from the instantaneous output load current. The arrangement is such that the AC output is equal to the AC input with no regulation effect. Substantially one hundred percent efficiency results when very little power factor correction is required.

Abstract: A circuit wherein a current sensing device is incorporated in an AC input line. An AC output is taken from the output of said current sensing device and from an other AC input line. Circuitry including two bi-directional switching regulators (positive and negative) and two energy storage capacitors adds current to or subtracts current from the instantaneous output load current. The arrangement is such that the AC output is equal to the AC input with no regulation effect. Substantially one hundred percent efficiency results when very little power factor correction is required.

Abstract: A d.c. to d.c. converter power supply having two substantially independent regulated outputs. A pulse width modulator (PWM) converts input d.c. to a.c. having a variable frequency and a variable duty cycle. The a.c. is applied to a transformer having two secondary windings for separate d.c. outputs. One of the secondary windings feeds a rectifier having a capacitor input type filter and means for regulating the output voltage by controlling the duty cycle of the PWM. The other secondary winding feeds a rectifier having a choke input type filter and means for regulating the output voltage by controlling the frequency of the PWM.

Abstract: A pulse width modulated DC-to-DC converter circuit is disclosed having a el means for permitting each of the switching transistor duty cycles to exceed 50% without the occurrence of current spikes at the input winding of the output transformer. These current spikes result when both switching transistors are on when each of the transistors switch operating states at an instantaneous point in time. As a result, a wide range of input power source voltages can be utilized for a given output voltage thereby resulting in a wide range of voltage regulation. This result is achieved by utilization of an energy storage choke between the battery means and the input winding of the output transformer. Whenever there exists an instantaneous current spike, the choke absorbs the spike.

Abstract: A driver circuit is provided for producing and controlling the dead-time of witching transistors in DC-to-DC or DC-to-AC converter circuits to prevent cross conduction and/or to control the output voltage as a function of that dead-time. Driver transistors are switched alternately ON and OFF and drive the switching transistors through a capacitor-shunted transformer primary having a charging current applied to a center tap thereon to predictably control the gradual application to and removal of base drive from the switching transistors, thereby predictably controlling the dead-time of the switching transistors and in some applications, the output voltage of the converter circuit also. The charging current may be either manually or automatically varied to vary the dead-time as desired.

Abstract: A dynamic temperature compensating circuit is disclosed for driving the bs of a first and a second transistor connected in the common-emitter configuration, having collector-emitter paths of the two transistors connected together in a current loop. The circuit employs diodes arranged in parallel in the base-emitter drive circuit of each transistor, to clamp the transistors on or off at appropriate times. The diodes and transistors are composed of the same type of semi-conductor material so that their respective forward bias potentials maintain equal magnitudes over a range of temperatures. The circuit has particular application in D.C.-A.C. and D.C.--D.C. converters.