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| Number | Title | Issue Date |
| 7339331 | Dimmer circuit with improved ripple control A dimmer circuit arrangement is disclosed including a second control circuit for controlling the operation of a triac for delivering current to a load, and a first control circuit for controlling the operation of an IGBT power semiconductor switch for controlling th... | 03/04/2008 |
| 7336463 | Device and method for dimming service loads A device and method are provided for detecting and configuring a solid state dimmer when wired in series or parallel with a load powered by an alternating current (AC) input. The device can comprise a microcontroller configured to be powered by the AC input. A zero-... | 02/26/2008 |
| 7291984 | Method of reducing RMS load voltage in a lamp using pulse width modulation A method of converting a line voltage to an RMS load voltage in a lamp includes modulating a load voltage with a pulse width modulation circuit that is entirely within the lamp and provides an RMS load voltage to a light emitting element of the lamp. Conduction is t... | 11/06/2007 |
| 7274148 | Lamp having fixed forward phase switching power supply with time-based triggering A lamp contains a lamp voltage conversion circuit that is entirely within a base for converting a line voltage at a lamp terminal to an RMS load voltage at a light emitting element. The voltage conversion circuit includes a forward clipping circuit with a three-term... | 09/25/2007 |
| 7224151 | Fixed phase power controller with analog trigger A fixed phase power controller that converts a line voltage to an RMS load voltage includes an analog control block with a capacitor that receives an input that is independent of a change in magnitude of the line voltage and that charges and discharges to provide a ... | 05/29/2007 |
| 7221106 | Cordset based appliance controller An apparatus and method for distributed control of an electrical appliance having a plug and a load and two power carrying conductors connecting the plug to the load, comprising locating power control elements completely within the plug, connecting interface element... | 05/22/2007 |
| 7126317 | Apparatus and methods for regulated voltage An electronic system according to various aspects of the present invention includes a memory and a supply regulation circuit having a regulated output to provide a selected voltage level. In one embodiment, the supply regulation circuit includes a reference voltage ... | 10/24/2006 |
| 7002396 | Frequency converter A frequency converter includes a transistor pair having a first transistor and a second transistor respectively having collector terminals commonly connected to each other and emitter terminals commonly connected to each other, the commonly-connected collector termi... | 02/21/2006 |
| 6952092 | Watt power device An energy savings circuit comprising a means for receiving an ac voltage source; a first voltage storage device in series with the ac voltage source; a second voltage storage device electrically connected to the ac voltage source; a third voltage storage device in s... | 10/04/2005 |
| 6750642 | Power conserving regulator having intermittently connectable controller In a DC—DC converter, a regulator circuit 14 acts to drive a switching element Q1 based on an error between a detected voltage obtained by a voltage divider circuit 11 and a reference voltage from a reference voltage generating circuit 12 | 06/15/2004 |
| 6184671 | Apparatus and method for controlling the supply of power to a device when a power on/off signal is input A power control apparatus is provided that receives an input power voltage from a power source and supplies a corresponding output power voltage to a device. The apparatus contains a counter, a processor, and a switch. The counter inputs a power control s... | 02/06/2001 |
| 5736840 | Phase shifter and communication system using the phase shifter A local signal of a predetermined frequency is supplied to an input terminal of a local signal input section. The local signal is applied to a control input terminal of a variable current supply and, in accordance with the local signal, a current is outpu... | 04/07/1998 |
| 5712558 | Optically actuated and controlled dimmer type light switch An optically controlled dimmer type device which can be used to regulate the brightness of an incandescent lamp. The device can also be used to control other electrical loads such as a.c. type motors. One of the main characteristic of the device is that i... | 01/27/1998 |
| 5668496 | Circuit arrangement for limiting the current to be switched of an electrical load A circuit arrangement for limiting the current to be switched of an electrical load, with the power input of the electrical load being controlled by means of a Triac, said Triac being connected in series with the electrical load, with a Diac being connect... | 09/16/1997 |
| 5585713 | Light dimmer circuit with control pulse stretching A dimmer circuit uses a triac for controlling application of power to a hot terminal where a load will be connected. A DC power supply develops DC power for powering a control circuit which includes a zero crossing detector circuit connected to an integra... | 12/17/1996 |
| 5051607 | Switch time delay apparatus A time delay apparatus configured to connect in parallel with a common single pole switch. For time delay operation the switch is toggled on and off again within a short time span defined as the trigger window period. This triggering results in the circui... | 09/24/1991 |
| 4935691 | Phase switched power controller A phase switched power controller connects a load to a alternating current source for a proportion of each half cycle selected by the user. A first full wave rectifier is connected to the voltage source and produces an unfiltered full wave rectified outpu... | 06/19/1990 |
| 4926304 | Switched-mode power supply with low loss interrupted oscillation A switched-mode power supply circuit for converting a DC input voltage into a DC output voltage comprises a series arrangement of a controllable power switch and an inductive element coupled between the input voltage terminals. Control means are provided ... | 05/15/1990 |
| 4883944 | Heating apparatus having an open-loop configuration for controlling temperature A heating apparatus measures the operation time and the inoperative time using an operation equation to switch the magnitude of the thermal supply of the heating apparatus in accordance with the calculated values. The heating apparatus includes a heater a... | 11/28/1989 |
| 4878011 | Proportional firing circuit A relay control circuit which is capable of reliably controlling the transmission of electrical power in very small time increments. Specifically, the present invention features a proportional firing circuit which will create an SCR firing signal whose pu... | 10/31/1989 |
| 4798971 | Apparatus for controlling device start up and off/on running periods A forced air gas heating furnace system includes a thermostat having a transformer for converting the typical household 115Vac to a 24V thermostat ac control voltage, and a switch, the thermostat elements connected to the junction of an ac to dc converter... | 01/17/1989 |
| 4692632 | Procedure and apparatus for uninterruptible power supply To supply various loads connected to a uninterruptible bus, a power supply system N is connected (when functioning normally) by means of a mechanical switch, keeping an energy storage unit charged by means of a static converter which also functions prefer... | 09/08/1987 |
| 4687985 | Two terminal control switch having a main switch and a saturable current transformer whose primary winding is series connected with the main switch A two terminal control switch having a main switch and a saturable current transformer whose primary winding is series connected with the main switch. A center tapped full wave rectifier has a capacitor connected between its DC sides, such capacitor also ... | 08/18/1987 |
| 4667147 | Inductive proximity switch This invention concerns an inductive proximity switch having an oscillator and a resonant circuit which is dampable by outside objects, as well as an electronic switch controllable by the voltage across the resonant circuit. From the signal of the electro... | 05/19/1987 |
| 4651022 | Digital touch operated switch A touch operated switch for control of electrical lighting, appliances, machinery and equipment which requires non sparking fail-safe operation. The switch utilizes digital complementary metal oxide semi-conductor technology which requires nearly insignif... | 03/17/1987 |
| 4591781 | Variable control circuit having a predetermined timed output A circuit for varying the current to a load and, simultaneously, limiting the output of the load to a predetermined time interval. A timer chip having an RC network receives rectified current from an AC voltage source and responds thereto with a high outp... | 05/27/1986 |
| 4584519 | Incremental touch-operated switch This patent presents a touch-responsive switch which incrementally varies AC voltage supplied to an electrical apparatus. The invention includes digital circuitry which compares a control pulse train with a touch affected pulse train to create a switching... | 04/22/1986 |
| 4538231 | Circuit for electric power source An apparatus and method for stabilizing an output of a D.C. power source by using a micro-computer to regulate an input voltage to provide an output voltage according to a controlling signal. The invention further utilizes a periodic interruption process ... | 08/27/1985 |
| 4528494 | Reverse-phase-control power switching circuit and method A reverse-phase-control power switching circuit provides for controlling the flow of current through a load, from an A.C. source, and includes circuitry for limiting the in-rush current for a load having a variation of resistance due to initial turn-on ph... | 07/09/1985 |
| 4504778 | Self-powered, self-regulated, electronic ac control system A system of controlling the operation of an AC load with a switch placed in series with the load, which switch is itself operated by dc control logic powered by power loss experienced by the switch which the logic controls. Numerous elements in the contro... | 03/12/1985 |
| 4500795 | Electrical timing control switch An electrical timing circuit for controlling the activation and deactivation of an electrical load by setting a predetermined time period for which the load will be on and for providing one or more short warning periods wherein the load is deactivated pri... | 02/19/1985 |
| 4488106 | Resettable power limiting apparatus This apparatus can limit the power by limiting the duty cycle of current carried by a pair of lines. These lines intermittently conduct electrical power. A clock can provide a periodic timing signal. This clock is resettable to change the phasing of the t... | 12/11/1984 |
| 4475076 | Power tapping apparatus This apparatus can apply electrical power to a supply terminal from a pair of lines having a variable current and voltage. The apparatus has a voltage tapper and a series device. The voltage tapper is coupled to the lines and to the terminal for applying ... | 10/02/1984 |
| 4465965 | Power limiting apparatus Apparatus can limit power by limiting the duty cycle of current carried by a pair of lines. The lines intermittently conduct electrical power. The apparatus has a clock, a converter and a switch system. The clock can provide a timing signal. The converter... | 08/14/1984 |
| 4398131 | Device for controlling the variations in time of the power of a lighting installation in relation to a preset programme In a lighting installation comprising light sources each connected to an A.C. supply system, a control device including: power variation circuits connected to the different sources and each comprising means for varying the electrical power supplied to the... | 08/09/1983 |
| 4390939 | Electric power source device An electric power source device for electrolytical production or coloring of alumilite, wherein pulses are generated at a predetermined phase of A.C. source, the pulses are frequency-divided by a non-contact circuit and, depending on the results of the fr... | 06/28/1983 |
| 4338562 | Load control circuit with timed interruption The control circuit is preferably provided in an integral unit with a momentary on-off switch, preferably inside a switch housing box and adapted to replace a common wall switch to provide for the automatic turn-off of the light or other load operated by ... | 07/06/1982 |
| 4337430 | Inductive-load power control circuit A circuit for controlling power delivery to different AC inductive loads, which loads create different respective lag angles between applied voltage and delivered current up to a known maximum lag angle. Included is a switching circuit, typically includin... | 06/29/1982 |
| 4302651 | High-voltage SCR circuit for microwave oven and the like An SCR circuit is provided in a high-voltage supply for energizing a magnetron that is assembled in a microwave oven. The high-voltage supply circuit includes a voltage step-up transformer. This transformer is arranged with a low-voltage secondary winding... | 11/24/1981 |
| 4227062 | Optimum time ratio control system for microwave oven including food surface browning capability An optimized time ratio control system for a microwave oven including a food surface browning system. The system is particularly useful where the available power is insufficient to operate both the browning system and the microwave energy generating syste... | 10/07/1980 |
