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| Number | Title | Issue Date |
| 4420700 | Semiconductor current regulator and switch A semiconductor current regulating and switching apparatus is described wherein an NMOS enhancement mode power transistor is used in the positive lead to regulate the flow of current from a power source to a load. In order to achieve a low resistance on-s... | 12/13/1983 |
| 4417201 | Control means for controlling the energy provided to the injector valves of an electrically controlled fuel system A circuit for controlling the energy supplied to electromagnetic injector valves in an electronically controlled fuel injection system is disclosed herein. The disclosed circuitry limits the voltage available to the injector valves to a selected maximum l... | 11/22/1983 |
| 4405889 | Power supply for repetitive discharge apparatus A power supply for repetitive discharge apparatus such as a laser comprises an unregulated DC source, a primary storage capacitor, a discharge capacitor forming part of the apparatus and an energy feedback circuit between the discharge and storage capacit... | 09/20/1983 |
| 4395675 | Transformerless noninverting buck boost switching regulator A buck boost type noninverting transformerless switching regulator utilizes two synchronized switches operating at either the same or different duty cycles to independently control energy storage and energy delivery from a two terminal inductor element to... | 07/26/1983 |
| 4383216 | AC Measurement means for use with power control means for eliminating circuit to circuit delay differences An on chip delay regulator circuit which varies the power in logic or array circuits on the chip so as to minimize, or eliminate, chip to chip circuit speed differences caused by power supply variations and/or lot to lot process differences, temperature, ... | 05/10/1983 |
| 4358654 | Static power switching system for induction heating A static power switching system utilizes a parallel LC resonant circuit which is energized from a unilateral electrical power source through a switch circuit beginning at the point of minimum voltage across the switch circuit. Current drive to the resonan... | 11/09/1982 |
| 4357654 | DC--DC Converter In a DC--DC converter of the type in which an inductance stores energy when a main switching transistor is turned on and releases the stored energy when the main switching transistor is turned off, a semiconductor active element is used as a flywheel elem... | 11/02/1982 |
| 4355403 | Teletypewriter line keyer with switching current regulator A teletypewriter line keyer with a switching current regulator responsive to a floating, loop current powered voltage comparator used as a loop current monitor. The line keyer, which may have positive and negative line current keying, uses a single curren... | 10/19/1982 |
| 4354151 | Voltage divider circuits Complementary symmetry inverter connected at its output terminal to the input terminal of a complementary symmetry source follower and a feedback connection, via negligible impedance means, from the output terminal of the source follower to the input term... | 10/12/1982 |
| 4350948 | Voltage-step-down circuit with chopping transistor for D-C power supply A circuit for reducing the voltage of a d-c power supply with one grounded terminal comprises a chopping transistor in an ungrounded supply lead, periodically turned on and off by an electronic switch, and an L/C network downstream of that transistor alon... | 09/21/1982 |
| 4347474 | Solid state regulated power transformer with waveform conditioning capability Apparatus for providing the voltage transformation functions of a conventional electrical power transformer. An AC input signal is chopped in a solid state switching converter at a frequency very much larger than the frequency of the input signal and then... | 08/31/1982 |
| 4346343 | Power control means for eliminating circuit to circuit delay differences and providing a desired circuit delay An on chip delay regulator circuit which varies the power in logic or array circuits on the chip so as to minimize, or eliminate, chip to chip circuit speed differences caused by power supply variations and/or lot to lot process differences, temperature, ... | 08/24/1982 |
| 4316136 | Switching regulator control In a method for controlling a switching regulator composed of a controllable electronic switch and a transformer, in which the electronic switch forms a series path with the transformer primary, the series path is connected in series between a direct volt... | 02/16/1982 |
| 4307440 | Stabilized switching voltage regulator comprising means for preventing overloads due to initial surge currents A switching voltage regulator (86) is controlled to produce a low output voltage when the power is first turned on and subsequently to produce a high output voltage after a predetermined length of time has elapsed, thereby eliminating overloads due to ini... | 12/22/1981 |
| 4302717 | Power supply with increased dynamic range A power supply circuit impresses a signal supplied by a pulse generator (28) at one frequency on an alternating current such as a standard AC signal at 115 volts RMS and 60 hertz by utilizing a single switching transistor (Q1) coupled between the pulse ge... | 11/24/1981 |
| 4293904 | Power frequency converter A power converter which provides precise waveshape regulation. An input pr waveform (three-phase or single phase power) is rectified and modulated to form a chopped waveform within an envelope defined by the rectified input waveform. The modulation is re... | 10/06/1981 |
| 4288831 | Shutdown circuit for a switching power supply A switching mode power supply provides a D.C. output voltage having a value related to the duty cycle of the supply's controlled oscillator produced signal. The inventive shutdown circuit inhibits operation of the supply if the duty cycle increases to a v... | 09/08/1981 |
| 4281281 | Reference voltage source A reference voltage source comprises a bridge circuit having two avalanche diodes in a first pair of opposite arms and two resistors in a second pair of opposite arms, as well as two operational amplifiers, An AC-DC voltage converter has its input connect... | 07/28/1981 |
| 4242629 | DC Switching voltage regulator with extended input voltage capability A direct current, high voltage, switching voltage regulator for generating a low voltage, low current supply referenced to the positive side of the input voltage is provided while maintaining operation over an extended voltage input range with maximum eff... | 12/30/1980 |
| 4211912 | Induction heating apparatus An induction heating apparatus includes a pair of thyristors inversely parallel connected to receive power from a low frequency energy source, a commutating circuit and a gating control circuit for supplying control pulses to the thyristors to produce a f... | 07/08/1980 |
| 4203047 | Gate circuit of gate turn-off thyristor A first circuit means, which serves to cause reverse flow of a first pulse current of a large rate of rising and a narrow pulse width from cathode to gate of a gate turn-off thyristor in synchronism with the instant when turning off this thyristor, and a ... | 05/13/1980 |
| 4203040 | Force commutated static isolator circuit The invention provides a bilateral static isolator which is activated by "soft" forced commutation. Between two points in the power line to be interrupted are connected two thyristors in series-opposition, thus cathode to cathode. In antiparallel with eac... | 05/13/1980 |
| 4180852 | Control circuit for use in a switching-type regulator A control circuit is disclosed for use in a switching-type regulator which includes a source of unregulated DC voltage, a switching circuit for interrupting the unregulated DC voltage to produce an AC voltage having a duty cycle which is a function of the... | 12/25/1979 |
| 4163926 | Switching regulator for a television apparatus A controllable switch is coupled to a source of unregulated direct voltage and in a closed loop with a filter inductor and a storage capacitor and has its on-off state controlled at the horizontal deflection rate to control the voltage across the capacito... | 08/07/1979 |
| 4160934 | Current control circuit for light emitting diode The current in a semiconductive light emitting diode (LED), driven by an insulated gate field effect transistor (IGFET) switch, is stabilized by a current control circuit including a comparator type feedback network, which stabilizes the voltage at a node... | 07/10/1979 |
| 4122513 | Power control device An electric power control arrangement comprises a voltage conversion circuit, a signal producing circuit for producing signals to enable the conversion circuit, and a voltage supplying circuit operative in response to the signals from the signal producing... | 10/24/1978 |
| 4101808 | Lamp control circuit The disclosure relates to a lamp control circuit for maintaining the light output intensity of an incandescent lamp or banks of lamps constant. The lamp control circuit comprises a pair of input terminals adapted for connection to an illumination power so... | 07/18/1978 |
| 4096429 | Voltage and current regulator for generating systems A regulator for controlling the field exitation current of a generating device when the voltage developed exceeds a preset level and including a first resistor for establishing the level of a base current, a first transistor responsive to the base current... | 06/20/1978 |
| 4092709 | Multiple output self oscillating converter regulator power supply A multiple output switching regulator power supply operates as a self-oscillating circuit with a light weight ferrite core transformer and a sense winding used exclusively for voltage regulation purposes. A power transistor switch is employed to selective... | 05/30/1978 |
| 4042856 | Chopper ballast for gaseous discharge lamps with auxiliary capacitor energy storage A single phase, high frequency chopper ballast without large magnetic and capacitive components for gaseous discharge lamps such as the LucaloxR lamp is operated on full wave rectified line voltage. A small auxiliary capacitor stores energy dur... | 08/16/1977 |
| 4030024 | Switching power supply with floating internal supply circuit A preregulator power supply having drive and control circuits which are isolated or floating alternately from the input and output leads to permit direct coupling to the power switching regulator device without requiring isolation devices such as transfor... | 06/14/1977 |
| 4027228 | Photocoupled isolated switching amplifier circuit A switching transistor inverter circuit for driving high power AC loads such as arc discharge lamps from a DC electrical energy source. Each switching transistor is included in a switching amplifier whose response time is short as compared with the respon... | 05/31/1977 |
| 4017745 | Switching regulator power supply An improved switching regulator circuit is adapted for use with switch regulators in which more than one transistor is operated in parallel to provide a higher output current than normally obtained. Each transistor is operated with a separate inductor or ... | 04/12/1977 |
| 4016461 | Starting circuit for switching regulator In a transistor switching type voltage regulation circuit, energy precharge is provided in a by-pass loop around the switching transistor. The instantaneous peak power dissipation at turn-on through the switching transistor is thereby diminished, greatly ... | 04/05/1977 |
| 4015191 | D.C. high voltage power source with precise load current measurement A d.c. high voltage power source comprising: a d.c. high voltage generator; a voltage divider for detecting an output voltage of said generator, which is connected between the high voltage output terminal of said generator and ground potential; an error a... | 03/29/1977 |
| 4010401 | Constant-voltage converter having beam current detector A constant voltage converter for use with a cathode ray tube in which a voltage regulator is controlled by both the output of the regulator and beam current from the cathode ray tube by way of beam detecting means. The output of the regulator is applied s... | 03/01/1977 |
| 4002965 | Synchronized and regulated power supply A switching regulator adapted to be coupled to a source of alternating current potential produces a direct current potential having an amplitude proportional to the duration of a first drive signal condition relative to the duration of a second drive sign... | 01/11/1977 |
| 4001667 | Constant current-pulse led drive circuit A circuit for use with an oximeter system which provides constant current pulses to light-emitting diodes in a sequential and cyclical manner. The circuit maintains magnitudes of pulses in the pulse train equal to certain other pulses in the pulse train o... | 01/04/1977 |
| 4001663 | Switching regulator power supply A switching regulator power supply operates at a high frequency with a low loss, light weight ferrite core transformer. The transformer primary is selectively connected across a DC source of rectified AC power for a predetermined time to provide energy st... | 01/04/1977 |
| 3992650 | Apparatus to prevent overcurrent or overvoltage Across a D.C. power source 1, a load 2, a switching element 4, such as a transistor having a control electrode c (base), and a voltage detection means 5, such as a resistor, are connected in series, and a known negative resistance device 6, having two ter... | 11/16/1976 |
