Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 8067924 | Phase shedding converter with ripple minimization In an information handling system, a multi-phase electrical converter includes an electrical input, an electrical output, a plurality of converter phases coupled with the electrical input and the electrical output, and a controller to ramp operation of one or more o... | 11/29/2011 |
| 7999519 | Phase shedding converter with ripple minimization In an information handling system, a multi-phase electrical converter includes an electrical input, an electrical output, a plurality of converter phases coupled with the electrical input and the electrical output, and a controller to ramp operation of one or more o... | 08/16/2011 |
| 7906945 | Soft-start voltage circuit A soft-start voltage circuit includes an operational amplifier, a first and a second capacitors, a first and a second switches, and a voltage level shifter. The operational amplifier includes a positive end, a negative end, and an output end coupled to the negative ... | 03/15/2011 |
| 7349192 | Method of operating a device for controlling electric actuators with optimum actuation current distribution There is described a method of operating a device (1) controlling electric actuators (3), and having a pair of input terminals (4, 5) connected to an electric energy source (6, 10); a number of pairs of output terminals (7, 8), bet... | 03/25/2008 |
| 7345449 | Method of rotating a polyphase motor at less than rated speed A polyphase AC induction motor is connected to a power supply through a soft starter having three sets of inverse parallel connected silicon controlled rectifiers with each set corresponding to one particular phase. Low speed starting and operation of the motor can ... | 03/18/2008 |
| 7319282 | Switch circuit A switch circuit for controlling the supply of electrical power from an electrical power source to a load includes a power supply switch comprising input, output and control terminals. The circuit further includes an electronic switching device connected to the cont... | 01/15/2008 |
| 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 |
| 7274149 | Lamp with integral pulse width modulated voltage control circuit A lamp has a voltage controller that converts a line voltage to an RMS load voltage suitable for operation of the lamp's light emitting element, where the voltage controller is entirely within a lamp base and uses pulse width modulation to define the RMS load voltag... | 09/25/2007 |
| 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 |
| 7218054 | Lamp having fixed phase power controller with analog trigger A lamp which includes a fixed phase power controller connected between a terminal and a light emitting element converts line voltage to an RMS load voltage. The controller has an analog control block that receives an input that is independent of a change in magnitud... | 05/15/2007 |
| 7199532 | Lamp containing phase-control power controller with analog RMS load voltage regulation A lamp includes a phase-control power controller within the lamp. The phase-control power controller includes an analog load voltage sensor that provides an optical output related to an RMS load voltage and a phase-controlled dimming circuit that has a comparison ci... | 04/03/2007 |
| 7196912 | Lighting apparatus for discharge lamp In a lighting apparatus for a discharge lamp, a mask signal against a re-arc voltage is correctly generated to detect a lamp voltage accurately in view of a support to high frequency lighting such that the detection of the lamp voltage is not affected by the re-arc ... | 03/27/2007 |
| 7170236 | Method of setting desired RMS load voltage in a lamp A method of converting a line voltage to a desired RMS load voltage in a lamp includes the steps of pulse width modulating a load voltage with a pulse width modulation circuit, triggering conduction in the pulse width modulation circuit independently of a line volta... | 01/30/2007 |
| 7170231 | Lamp that sets desired RMS load voltage with variable pulse width modulation A lamp includes a voltage controller that converts a line voltage to a desired RMS load voltage. The voltage controller is entirely within a lamp base and uses pulse width modulation to define the RMS load voltage. The voltage controller has a feed-back circuit that... | 01/30/2007 |
| 7166964 | Lamp containing pulse width modulated voltage conversion circuit A lamp includes a voltage conversion circuit entirely within a lamp base. The voltage conversion circuit includes a pulse width modulator for modulating a lamp load voltage and provides a load voltage to a light emitting element. A feed-back circuit adjusts the puls... | 01/23/2007 |
| 7157943 | Frequency selection of switch mode power converters via softstart voltage level A switch mode power converter that limits the in-rush current at start-up and reduces the occurrence of output voltage overshoot over a range of switching frequencies. The converter includes at least one Soft-Start (SS)/Frequency-Select(FS) input, at least one oscil... | 01/02/2007 |
| 7106031 | Electric power supply apparatus having input switching circuit In a power supply apparatus, a switching circuit selectively applies one of an input voltage of a power converting circuit and an output voltage of the power converting circuit to a voltage reducing power supply circuit. When the input voltage is applied to the powe... | 09/12/2006 |
| 7075804 | Tracking soft start circuit for generating a plurality of soft start voltages where all soft start voltages are prevented until all have been brought to the same prescribed state of operation A tracking soft start circuit architecture contains a plurality of soft start circuits for generating a plurality of soft start voltages during startup for application to associated power supply terminals of a power supply system. The soft start circuits are interco... | 07/11/2006 |
| 7049879 | Power supply circuit with control of rise characteristics of output voltage In a power supply circuit, a main transistor, which transmits power from an input terminal to an output terminal, is controlled so that a detected voltage from an input voltage is consistent with a reference voltage indicating a target voltage. An output current is ... | 05/23/2006 |
| 7049750 | Lamp having integral voltage controller A lamp includes a voltage conversion circuit that converts a line voltage to a desired RMS load voltage. The voltage conversion circuit is entirely within a lamp base and uses pulse width modulation to define the RMS load voltage. The voltage conversion circuit incl... | 05/23/2006 |
| 7046014 | ATE measurement technique for comparator threshold voltage A system and a method for testing a comparator include generating two triangular waveform segments having the same period and different amplitudes, inputting the two triangular waveform segments into a comparator, receiving an output of the comparator, and calculati... | 05/16/2006 |
| 7034473 | Phase-control power controller for converting a line voltage to an RMS load voltage A phase-control power controller that converts a line voltage to an RMS load voltage includes a phase-control circuit connected to the line and load terminals and having an RC network that clips the load voltage. A load sensing circuit is connected across the load t... | 04/25/2006 |
| 6998829 | Soft start precharge circuit for DC power supply A soft start circuit for a DC-DC converter has an input reference voltage coupled to an error amplifier and to a soft start capacitor. A feedback resistor is coupled between an output node and the error amplifier, whose output is coupled to a pulse width modulator (... | 02/14/2006 |
| 6922320 | Hot-swap protection circuit Embodiments of the present invention provide methods and circuitry for protecting a circuit during hot-swap events. Hot swap protection circuitry includes as overcurrent detection circuit which decouples power from a load. Circuitry is provided to detect ground-faul... | 07/26/2005 |
| 6794619 | Heater energization control circuit, heater energization control method, and image forming apparatus A heater energization control circuit includes a heater, a power source that supplies an alternating current to the heater, a first capacitor that charges and discharges in accordance with a first time constant that is determined by an electrostatic capacity of the ... | 09/21/2004 |
| 6157010 | Heater control device A heater control device that prevents a flickering by driving a fixing heater in a phase controlling at a fixed phase angle for predetermined duration when an image forming apparatus starts power supplying to the fixing heater.... | 12/05/2000 |
| 5861737 | Soft-start switch with voltage regulation and current limiting A MOSFET, an op-amp, a comparator circuit, and voltage dividers with capacitors are employed in combination to effectuate a soft-start switch with current limiting. The transconductance of the MOSFET is employed so that no sense resistor is required. The ... | 01/19/1999 |
| 5838144 | Solid state, reduced voltage motor starter enabling equalized input/output volt-amp ratings A motor starter circuit for minimizing the amount of current drawn by the motor from a power source during starting of the motor through current transformation achieved by selectively controlling actuation of a plurality of high speed switches. The circui... | 11/17/1998 |
| 5777864 | Resonant converter control system having resonant current phase detection A resonant convertor control system regulates a resonant AC current based on the amount of input power consumed by the system. The switching frequency and resonant AC current are limited by a phase difference assurance circuit that compares the phase of a... | 07/07/1998 |
| 5721478 | Process and device for supplying a polyphase electric motor during startup A motor is supplied with electricity across a transformer (T) which outputs on a busbar (J) which is connected to the motor (M) and to other electrical energy consuming devices, the motor by itself consuming an active power greater than or equal to 20% of... | 02/24/1998 |
| 5719473 | High frequency operating circuit with in-rush current protection for operation of discharge lamps An auxiliary or ballast circuit for high-frequency operation of discharge mps (E), for example sodium high pressure discharge lamps, provides for controlled inrush or "ON current" by including a thyristor (TH1) or pair of thyristors (TH2, TH3) in the curr... | 02/17/1998 |
| 5698973 | Soft-start switch with voltage regulation and current limiting A MOSFET, an op-amp, a comparator circuit, and voltage dividers with capacitors are employed in combination to effectuate a soft-start switch with current limiting. The transconductance of the MOSFET is employed so that no sense resistor is required. The ... | 12/16/1997 |
| 5528131 | Controlled electric power switch and process for switching an electric power circuit This invention relates to an electric switch intended to be placed in an electric power circuit, said switch being responsive to a control signal. The switch comprises a semiconductor switch, an electromechanical switch and a signal processor. The electro... | 06/18/1996 |
| 5504394 | Lamp bulb having integrated lighting function control circuitry and method of manufacture An incandescent lamp bulb which is driven by an electronic control module (ECM) and method of manufacture characterized in that an inductor comprising a magnetic spool and a winding thereon is disposed within a screw shell base of the lamp bulb and surrou... | 04/02/1996 |
| 5504395 | Lamp bulb having integrated RFI suppression and method of restricting RFI to selected level An incandescent lamp bulb which is driven by an electronic control module (ECM) and method of manufacture characterized in that an inductor comprising a magnetic element and a winding thereon is disposed within a screw shell base of the lamp bulb and surr... | 04/02/1996 |
| 5479086 | Process and device for reducing the inrush current when powering aninductive load A transformer is energized from an a.c. source by initially applying the . voltage to the transformer during small but progressively increasing fractions of a succession of initial half-cycles. This is continued until the rated voltage is achieved or unt... | 12/26/1995 |
| 5450001 | Process and device for safeguarding an alternating current circuit having an electrical load associated therewith A device runs a precheck of an inductive load for an overload prior to swhing on to supply mains. For this purpose, following switching-on for a load precheck, initially a phase limited voltage signal is applied to the load, whereby the voltage signal du... | 09/12/1995 |
| 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 |
| 5070229 | Window heater controlling apparatus providing a gradual heating voltage In a window heater controlling apparatus used in an automobile, a heater control unit including a microcomputer is employed to detect a heater-ON condition and thereafter to control the heating voltage of the alternator in such a manner that the heating v... | 12/03/1991 |
| 5030890 | Two terminal incandescent lamp controller A two-terminal, alternating current power control device connected in an electrical path between a load and a remote switch, comprising a current switching device, a controlling device and a direct current power supply device. The current switching device... | 07/09/1991 |
