Quotables
"The horse is here to stay, the automobile is only a novelty - fad."
President of Michigan Savings Bank ; 1903
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7403049 | Triangular wave generation circuit A first constant-current source supplies a charging current to a second terminal of a first capacitor in which a first terminal is grounded. A first terminal of a second capacitor is grounded, and a first switch is provided between the second terminal of the first c... | 07/22/2008 |
| 7351204 | Ultrasonic diagnostic apparatus For the purpose of reducing the size and power consumption of a power source in an ultrasonic diagnostic apparatus, charge pump circuits are connected to a transmitter power source. A regulator in the transmitter power source drives the charge pump circuit to genera... | 04/01/2008 |
| 7342436 | Bipolar supply voltage generator and semiconductor device for same A reduced-size bipolar supply voltage generator which produces a positive and negative voltages from a unipolar power source. A single inductor is employed for current switching operation, where electric energy supplied from a power source is stored in magnetic form... | 03/11/2008 |
| 7300493 | Apparatus and method for controlling air cleaning Disclosed is an apparatus and method for controlling an air cleaning. The apparatus includes an air cleaning element, an AC high-voltage generator and a control unit. The air cleaning element generates negative ions and ozone using plasma discharge, and cleans indoo... | 11/27/2007 |
| 7295131 | Diagnostic system for detecting rupture or thinning of diaphragms A diaphragm diagnostic system for use in an industrial field device has a diaphragm and a diagnostic feature. The diaphragm is configured to couple the field device to a process fluid and has a plurality of layers. A first layer of the plurality of layers is exposed... | 11/13/2007 |
| 7224208 | Voltage regulator which outputs a predetermined direct-current voltage with its extreme variation restrained A voltage regulator has a reference voltage generator that outputs a reference voltage based on first and second electrical source voltages, an output circuit which generates a predetermined direct-current voltage based on the reference voltage and generates a compa... | 05/29/2007 |
| 6995522 | Phase controller In a phase controller used in a light control of an incandescent lamp, noise reduction, prevention of elements from damage due to short circuit current, downsizing and lower cost are purposed. A CPU circuit of a control circuit sets a gradual increase term during wh... | 02/07/2006 |
| 6694282 | Method and device for determining an operating temperature of a semiconductor component A method and a device determine an operating temperature of a semiconductor component during operation, wherein the semiconductor component has a PROM memory area which can be read from the outside. The device further has a programming device for programm... | 02/17/2004 |
| 6420857 | Regulator A regulator is provided with circtuiry for restraining a variation in a frequency band and to provide a transient response characteristic which does not depend upon load current. A load current detecting transistor is connected in parallel with an output ... | 07/16/2002 |
| 6342779 | Method of control by phase angle In order to produce a phase control device which is free of the constraints of drifts due to the supply frequency or to the temperature of the components forming it, a method is recommended in which a command signal delivered by a control is modified by a... | 01/29/2002 |
| 6226582 | Integrated control for electric lift trucks A control system for an electric lift truck that controls a traction motor and a hydraulic pump motor is disclosed. The speed of rotation of both motors is controlled by a pulse width modulated current supplied from a battery source by the controller in d... | 05/01/2001 |
| 5684366 | Lamp protection device A lamp protection device includes a circuit to prevent a lamp from being switched on at full line voltage and which provides for the gradual heating of the filament to reduce the expansion rate of the filament. The circuit is connected to a switched alter... | 11/04/1997 |
| 5565820 | Pulse width power supply modulator A pulse width modulation type power supply modulator capable of operating at high switching frequencies (>10 MHz) is achieved by eliminating resonant circuits which limit the maximal switching frequency. The modulator includes a power circuit including a ... | 10/15/1996 |
| 5563498 | Power supply regulator An apparatus and method for supplying a regulated direct electric current comprises a switch mode regulator having an input for receiving a varying source of electrical power. A linear regulator provides a source of low noise direct current and has an inp... | 10/08/1996 |
| 5309084 | Electronic switch with on/off fading The present invention provides a electronic switch suitable for fading on/off control of electrical equipment like lamps and motors. The main circuit comprises a rectifier bridge circuit and a thyristor. A control circuit includes a fast discharging synch... | 05/03/1994 |
| 5283516 | Low voltage dimmer with no load protection A low voltage dimmer is shown with the dimming function being on a primary side of a low voltage transformer. Live voltage feeds through a triac to the primary side of the transformer with the gate for the triac being controlled by a microprocessor. To pr... | 02/01/1994 |
| 5278492 | Controllable AC power supply for an ozonator An ozonator power supply including a step-up transformer having one end of its primary winding connected to one side of an AC supply, its other end connected to the other side of the AC supply via a pair of switches connected in antiparallel, and a contro... | 01/11/1994 |
| 5268631 | Power control system with improved phase control An improved phase-controlled power control apparatus includes a semiconductor switching element for varying the effective power delivered to a load from the power lines. The conduction angle of the semiconductor power switch element is varied from a nomin... | 12/07/1993 |
| 5179324 | Dimmer with reduced filtering losses A dimmer with reduced filtering losses is connected into a conductor supplying power to a load from a mains power supply. It conventionally comprises a triac in series with a filter inductor between an input terminal and an output terminal and a circuit g... | 01/12/1993 |
| 5081411 | AC/DC two-wire control techniques An apparatus and method is disclosed for controlling a load capable of functioning for a predetermined purpose in response to a predetermined amount of electrical power. The load can be operated from either an AC or DC source using a two-wire connection. ... | 01/14/1992 |
| 5038081 | Reverse phase-controlled dimmer Reverse phase-controlled dimming of an a.c.-powered load is accomplished by switching power to the load on and off during each half cycle. In one embodiment of the present invention, power is switched on when line voltage is substantially equal to load vo... | 08/06/1991 |
| 5001413 | Method of operating a switching regulator and apparatus therefor A switching regulator including a direct voltage source for producing an input voltage, an electronic switch connected between the voltage source and an output for switching the input voltage to the output, a pulse width modulator connected for controllin... | 03/19/1991 |
| 4968927 | AC power control A device for regulating delivery of power from an AC voltage source to a load such as a lamp, a motor, a heating element or the like is described. Electronic circuitry responsive to the AC voltage generates a periodic signal whose magnitude indicates the ... | 11/06/1990 |
| 4954768 | Two wire low voltage dimmer A low voltage two wire dimming circuit comprises a voltage compensating circuit for regulating the RMS value of an AC voltage applied to a load and a correcting circuit for eliminating damaging DC current that may flow through the load. The voltage compen... | 09/04/1990 |
| 4928054 | Switch mode electrical power controller A switch mode electrical power controller arranged to provide a width modulated output pulse signal in response to a control input signal representing a parameter controlled by the power controller, in which a signal processing network for generating the ... | 05/22/1990 |
| 4891571 | Control device for switching a thyristor A control device for switching a thyristor in a circuit including an a.c. voltage source, which comprises firing signal circuit having an input for receiving control signals, an output for providing firing signals for a thyristor and a detector for detect... | 01/02/1990 |
| 4876498 | Two wire low voltage dimmer A low voltage two wire dimming circuit comprises voltage compensating means for regulating the RMS value of an AC voltage applied to a load and correcting means for eliminating damaging DC current that may flow through the load. The voltage compensating m... | 10/24/1989 |
| 4864487 | Control for three terminal power semiconductor devices A control circuit for generating gating signals to drive the SCRs of an AC switch coupled between a three phase AC source and a three phase load. A reference voltage signal is derived from the source and, after filtering, is applied to a squaring amplifie... | 09/05/1989 |
| 4810952 | Circuitry and method for controlling power to fastener machine solenoid A method and apparatus for controlling power delivered to a fastening machine solenoid comprises a half wave rectifier, a filter network, an adjustable frequency generator and a pulse conditioning circuit. The frequency of the frequency generator is varie... | 03/07/1989 |
| 4800330 | AC power control A device for regulating delivery of power from an AC voltage source to a load such as a lamp, a motor, a heating element or the like is described. Electronic circuitry responsive to the AC voltage generates a periodic signal whose magnitude indicates the ... | 01/24/1989 |
| 4754213 | Supply circuit A supply circuit for an apparatus which is provided with a supply voltage which is low relative to the amplitude of a main voltage supplied from a main power supply network. The switching apparatus has a switching line arranged in the main power supply li... | 06/28/1988 |
| 4745300 | Two-wire switch The invention relates to a two-wire switch for connecting a load to an ac ltage source, and, in particular, to a two-wire switch with an auxiliary voltage source. A capacitor acting as charge storage device can be charged by the auxiliary voltage source w... | 05/17/1988 |
| 4680536 | Dimmer circuit with input voltage compensated soft start circuit A circuit for controlling the initiation and operation of a phase control circuit employed in voltage regulation to a load such as dimming lights. The circuit uses a power semi-conductor which is triggered by a "walk-in" circuit. The "walk-in" circuit inc... | 07/14/1987 |
| 4672301 | Power controller circuit with automatic correction for phase lag between voltage and current What is proposed is an electronic circuit for controlling the amount of AC power delivered to an inductive or resistive load which continuously measures the actual phase lag between the load current and applied voltage and automatically adjusts the firing... | 06/09/1987 |
| 4654579 | Frequency divider The frequency of an alternating current can be divided with a novel frequency divider, comprising a thyristor connected in series to main current circuit; a counting circuit (e.g. decimal counter or RC-time constant circuit); a trigger circuit for the thy... | 03/31/1987 |
| 4639657 | Electrical control apparatus and methods Apparatus for use in an electrical power generating system including a generator for supplying an A.C. output voltage to a load on a set of lines and a circuit responsive to the A.C. output voltage for producing a regulating voltage, the generator having ... | 01/27/1987 |
| 4633161 | Improved inductorless phase control dimmer power stage with semiconductor controlled voltage rise time An electronic dimming apparatus includes a semiconductor power controller which couples a lamp to an alternating current source and variably controls the average power supplied to the lamp by adjusting the relative proportion of each half-cycle in which t... | 12/30/1986 |
| 4573006 | Apparatus for feeding alternate polarity pulses to a load Alternate polarity pulses of current are fed to a load L1A by charging a capacitor C5A alternately in different directions and closing unidirectional switches V2A and V3A at appropriate times to discharge the capacitor C5A through the inductor L1A. This a... | 02/25/1986 |
| 4571537 | Condition monitoring means A monitoring circuit for monitoring the condition of, for example, a remotely situated structure is shown as having a transducer responsive to the occurrence of a preselected condition in the remotely situated structure and effective for causing a signal ... | 02/18/1986 |
| 4568870 | Phase control device A phase control device for regulating illumination of a fluorescent lamp means is disclosed, which includes a thyristor, an ignition circuit therefor and a delay circuit for providing a time delay of a predetermined period after a power switch of a drivin... | 02/04/1986 |
