Quotables
"We are probably nearing the limit of all we can know about astronomy."
Simon Newcomb, astronomer ; 1888
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 |
| 7345896 | Secondary side power supply controller and method therefor In one embodiment, a power supply controller generates a PWM control signal that is subsequently used to control a portion of current flow in a primary side of a power supply system. THE PWM control signal is coupled to a secondary of the power supply system and use... | 03/18/2008 |
| 7289340 | Switching power supply device A novel switching power supply device no more in need of a stand-by signal for turning on/off a switching element is provided. The switching power supply device is configured as having a main switching element Q1, wherein the switching power supply circuit is connec... | 10/30/2007 |
| 6862193 | Power supply apparatus There is provided a power supply apparatus that can raise the power supply efficiency while an appliance in which the power supply apparatus is installed is in a standby state, with a simple construction, without performing complicated control, and can reliably achi... | 03/01/2005 |
| 6816392 | Overcurrent output protecting circuit and constant-voltage switching power supply incorporating the same An overcurrent output protector is electrically connected to a constant-voltage switching power supply provided with a switching transistor which converts a DC voltage obtained by smoothing an AC voltage supplied from an AC power source into a cyclic pulse signal. I... | 11/09/2004 |
| 6756601 | High speed optocoupler Apparatus and method for increasing the bandwidth of an optocoupler includes cascode coupling the optocoupler driver transistor with a buffer so as to reduce voltage variations across the driver transistor. ... | 06/29/2004 |
| 6683443 | Soft start circuit for regulated power supply A power supply feedback circuit includes a regulating element at an input side of an optical isolator. The control lead for the regulating element is connected to a voltage divider to receive the divided voltage. A bypass circuit is provided on the voltag... | 01/27/2004 |
| 6510064 | Power supply restart circuit A restart circuit for a power supply of an electronic system such as a computer system for delaying the restart of the power supply until a power supply output is in compliance with a specified parameter. In one embodiment, the specified parameter is a pa... | 01/21/2003 |
| 6385061 | Switched mode power supply with programmable skipping mode A method and a power conversion apparatus having a substantially direct current input voltage, an output transformer having a primary inductor and at least a secondary winding, and a transistor for controlling the transfer of energy from the primary induc... | 05/07/2002 |
| 6353072 | Polymer preparation from boron derivative functional group-containing monomers A process for preparing a conjugated polymer, which comprises polymerizing in a reaction mixture (a) an aromatic monomer having at least two reactive boron derivative groups selected from a boronic acid group, a boronic ester group and a borane group, and... | 03/05/2002 |
| 6198639 | Circuit configuration and method for producing a constant output voltage in converters To produce a constant voltage at the output of a converter in the form of a step-up converter, current-mode control of the converter is superimposed by voltage-mode control in the range in which the input voltage applied to the inputs of the step-up conve... | 03/06/2001 |
| 6194881 | Switching power supply for lowered distribution system disturbance A switching power supply system is disclosed for powering electrical equipment while minimizing disturbance to an AC power line source. The system includes first and second AC switches which are operated at alternate intervals with respect to each other t... | 02/27/2001 |
| 6188584 | Power supply circuit maintaining electrical isolation A power supply circuit including a first rectifying smoother for generating a DC output when connected to an AC power source. A standby power source that provides a plurality of DC outputs when supplied with the DC output from the first rectifying smoothe... | 02/13/2001 |
| 6137696 | Switching regulator for power converter with dual mode feedback input and method thereof A switching power supply (10) uses a switching regulator (18) that is capable of operating in a dual mode with either primary side regulation or secondary side regulation. The primary and secondary side regulation schemes generate opposite phase feedback ... | 10/24/2000 |
| 6101105 | Apparatus and method for identifying an unregulated DC bus voltage A method and apparatus for calculating an accurate estimate of an unregulated DC bus voltage to be used with a DC-to-DC converter including a transformer having a primary winding and a secondary winding, the primary winding in series with a switch between... | 08/08/2000 |
| 6094365 | Power supply device of switching mode with leakage current protection circuit A power supply device of a switching mode comprises a transformer, a direct current power supply circuit connected at an output end thereof with a first end of a primary winding of the transformer, a switching element connected at a first end thereof with... | 07/25/2000 |
| 6088244 | Switching power supply using a single isolating element to facilitate multiple functions A switching power supply comprising a main converter that turns ON and OFF a DC current applied to a primary winding of a main transformer by a main switching element and outputs a main output voltage to a secondary circuit by rectifying and smoothing cur... | 07/11/2000 |
| 5995382 | Self-oscillation type switching power supply A self-oscillation type switching power supply includes a transformer having a primary winding, a secondary winding, a feedback winding, and a control winding as required, a switching transistor to turn on and off a current flowing in the primary winding,... | 11/30/1999 |
| 5995384 | Functional on/off switch for switched-mode power supply circuit with burst mode operation A switched-mode power supply circuit having an operating mode and a stand-by mode, includes a functional ON/OFF switch. The switched-mode power supply circuit includes a transformer and a controllable switch connected to a primary winding of the transform... | 11/30/1999 |
| 5956242 | Switched-mode power supply having a sample-and-hold circuit with improved sampling control A switched-mode power supply includes a transformer having a primary winding, a secondary winding and an auxiliary winding. A switching device is included in series with the primary winding for alternately interrupting the flow of current through the prim... | 09/21/1999 |
| 5949225 | Adjustable feedback circuit for adaptive opto drives In an electronic circuit having an input stage, an output stage having an output voltage, and a feedback element including a coupler having a transmitter coupled to said output stage and a receiver coupled to said input stage, said receiver being galvanic... | 09/07/1999 |
| 5949661 | Simple current limiting coupling for regulating the output current of a power supply An output current limiting coupling for a switched-mode power supply is arranged to produce a feedback signal on the basis of the output current of the switched-mode power supply and to transmit it from the secondary side of the switched-mode power supply... | 09/07/1999 |
| 5914865 | Simplified AC-DC switching converter with output isolation An AC-DC switching converter converts AC mains power into regulated DC power into a load. It is desired to electrically isolate the load from the mains, and this requires isolation in both the forward power transfer path and the reverse feedback path. The... | 06/22/1999 |
| 5880950 | Inverter driving circuit for brushless d.c. motor This invention provides an inverter driving circuit for brushless d.c. motor adapted to pass PWM signal to switching elements of the inverter, enabling reduction of the manufacturing cost, the circuit including a general-purpose photo-coupler for producin... | 03/09/1999 |
| 5808881 | Power-supply controller of computer The power-supply controller of a computer can minimize power-consumption as shown in the following description. The operation mode will convert to a sleep-mode reducing the power-consumption below a constant voltage if there is no input to operate a compu... | 09/15/1998 |
| 5798622 | Noncontacting electric power transfer apparatus, noncontacting signal transfer apparatus, split-type mechanical apparatus employing these transfer apparatus, and a control method for controlling same A noncontacting power transfer apparatus, a noncontacting signal transfer apparatus and a separate machine apparatus that uses these couplers are disclosed. The power coupler is composed of a primary side and a secondary side that are fixed to a static un... | 08/25/1998 |
| 5747982 | Multi-chip modules with isolated coupling between modules A silicon-on-silicon dual MCM apparatus comprising a printed circuit board having a voltage isolation boundary contained therein supporting a pair of multi-chip modules on either side of the voltage isolation boundary. The MCMs safely convey signals acros... | 05/05/1998 |
| 5640312 | Isolated power supply having power switch on secondary side A power supply for a computer system having at least one energy demanding component. The power supply includes a transformer having a primary side coupled to an AC main and a secondary side coupled to an output line, a charging circuit coupled between the... | 06/17/1997 |
| 5635827 | Power control system A power control system in a DIN rail mount assembly for switching power in a low cost, compact, and solid state for controlling electric heaters. The system can be used for single phase, three phase-two leg, and three phase-three leg. Current switching ca... | 06/03/1997 |
| 5636109 | Personal computer power supply with low-power standby mode activated by secondary side protection circuit A power supply for a computer system includes a transformer having a primary side coupled to an AC main and a secondary side coupled to an output line, a charging circuit coupled between the secondary side of the transformer and the output line, an optica... | 06/03/1997 |
| 5559422 | Wall transformer A wall mounted power supply for a remote instrument handle has a novel self compensating voltage regulating circuit that remains in precise calibration despite variable voltage drops in the load, cabling, and control switches. Power output is enabled by a... | 09/24/1996 |
| 5552978 | Device for supplying a voltage to an electronic circuit, in particular an electronic circuit associated with a current sensor disposed on an electrical line A device for supplying a power supply voltage to an electronic circuit, in particular to an electronic circuit associated with a current sensor for measuring the electrical current in a high-tension line, comprises a current transformer having a primary c... | 09/03/1996 |
| 5515263 | Isolated switching power source An object of the present invention is to reduce a cost and a power consumption, eliminating a voltage source for generating a reference voltage in an isolated switching power source achieving a feedback from an output side of the power source to a control... | 05/07/1996 |
| 5499176 | Pulse transformer circuit for isolating electrical signals A signal isolator circuit employing a pulse transformer overcomes the disadvantages of both prior art opto-coupler and pulse transformer signal isolator circuits by employing an active signal retrieval circuit which, in a higher accuracy configuration, re... | 03/12/1996 |
| 5491405 | Level conversion of AC or DC voltage with noise rejection and low power consumption An input voltage UIN to a voltage level converter 10 having a high input impedance charges a storage element which periodically discharges current to an LED 16 which periodically provides a light pulse for generating a level converted version o... | 02/13/1996 |
| 5475579 | Pulse width modulator for switching power supply An improved pulse width modulation type switching power supply uses an opto-isolator as an output voltage error amplifier which feeds back an error signal to control pulse width modulation as well as to provide isolation between the primary and secondary ... | 12/12/1995 |
| 5436553 | Optical power conversion An optical power conversion circuit converts an optical energy signal from an optical source, such as a laser diode, to a regulated D.C. electrical voltage using a single photodetector. A buck-boost circuit uses electrical current from the photodetector i... | 07/25/1995 |
| 5420498 | Circuit arrangement for generating a constant output voltage A circuit arrangement for generating a constant output voltage has a decoupling diode at the output side and has a circuit for actual value formation that is connected to the output of the circuit arrangement. In order, given high precision of the output ... | 05/30/1995 |
| 5406191 | Procedure and apparatus for the control of electric power Procedure and apparatus for the control of electric power, by which procedure the electric power supplied to a load is regulated by means of a regulator, e.g. a thyristor regulator. The regulator control signals, e.g. thyristor firing pulses, are produced... | 04/11/1995 |
| 5404545 | Interface isolation and selection circuit for a local area network An improved interface isolation and selection circuit for a local area network. The invention includes a power supply effective to provide an isolated output voltage. An opto-isolator transforms a first control signal to a second control signal effective ... | 04/04/1995 |
| 5345167 | Automatically adjusting drive circuit for light emitting diode A light emitting diode driving circuit for supplying a driving pulse to a light emitting diode to thereby cause the light emitting diode to intermittently emit light is disclosed which comprises a clamping circuit, a photodiode disposed in the vicinity of... | 09/06/1994 |
