Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 8437157 | Power line current fed power supplies producing stable load currents and related methods Power line current fed power supplies producing stable load currents and related methods are described. The power supplies may include a current transformer coupled to an inductive network. In some embodiments, the current transformer operates in saturation mode. In... | 05/07/2013 |
| 8416594 | Power converter with a controlled current source and connected in single-phase mode A control method implemented in a power converter, such as a variable speed drive, is disclosed. This control method is designed to make the power converter operate when the latter is connected to the network in single-phase mode. The power converter includes a cont... | 04/09/2013 |
| 7369420 | Control circuit for isolated forward DC-to DC converters An isolated DC-to-DC converter comprises a converter section configured to receive an input voltage and produce an isolated output voltage and a controller section configured to control the operation of the converter section to maintain the output voltage at a prede... | 05/06/2008 |
| 7369418 | Method and apparatus for a switch mode power supply that generates a high pulse width modulation gain while maintaining low noise sensitivity A power supply with high pulse width modulation gain and low noise sensitivity has been disclosed. In one embodiment, a power supply includes a regulator circuit controlling a power switch. The regulator circuit includes a control input that receives a current, whic... | 05/06/2008 |
| 7295452 | Active power factor correction circuit and control method thereof An active power factor correction (PFC) circuit and its controlling method are provided. The method comprises the following steps. Drive the power switch of the circuit so that the average inductor current waveform follows the rectified input voltage waveform. Suspe... | 11/13/2007 |
| 7019994 | Switched-mode power supply with a damping network The switched-mode power supply contains a transformer, a switching transistor in series with the primary winding of the transformer, and a damping network on the secondary side, which has a connection for a further secondary winding via which energy is transferred f... | 03/28/2006 |
| 6982887 | DC-DC converter with coupled-inductors current-doubler A coupled-inductor current-doubler topology for a power converter has first and second rectifiers and first and second coupled inductors. Each coupled inductor has a main inductor inductively coupled with a secondary inductor. The secondary inductor of the first cou... | 01/03/2006 |
| 6782513 | High power factor integrated controlled ferroresonant constant current source A method of designing a high power factor integrated ferroresonant constant current source includes the steps of providing an input coil disposed about a ferromagnetic core and to be coupled to an AC voltage source. An output coil is to be coupled to a load. A contr... | 08/24/2004 |
| 6678173 | Power supply apparatus for the reduction of power consumption A power supply apparatus having an AC power supply, a transformer, a switching element and a control circuit for controlling an operation of the switching element: where an electrical current is supplied to the primary side of the transformer intermittent... | 01/13/2004 |
| 6496391 | Power supply unit utilizing a current transformer A power supply unit for use in a measuring instrument at a plant. An output from a current transformer mounted on a power supply line is controlled so that the range of a primary current producing a stable output is increased. The invention includes a cur... | 12/17/2002 |
| 6473322 | AC-DC converter In an upconverter comprising a choke, a switching element and a diode, the switching element is controlled in such a way that the time interval during which the switching element is non-conducting is proportional to the time interval during which the diod... | 10/29/2002 |
| 6191960 | Active clamp for isolated power converter and method of operating thereof A secondary active clamp for a power converter, a method of actively clamping energy of the power converter and a power converter employing the clamp or the method. The power converter has a primary switching circuit coupled to a primary winding of an iso... | 02/20/2001 |
| 6178098 | Phase-shifted post-regulator, method of operation thereof and power converter employing the same For use in a power converter having an inverter coupled to an output rectifier, a post-regulator, a method of operating the same and a power converter incorporating the post-regulator or the method. In one embodiment: (1) a switching circuit, having at le... | 01/23/2001 |
| 6011704 | Auto-ranging power supply Autoranging power supply apparatus may comprise a power output section having a plurality of pairs of output terminals, each of which has a maximum voltage and current rating. A switching network associated with the power output section connects and disco... | 01/04/2000 |
| 5999418 | Control device for an electromagnet coil Device designed to control a coil forming part of a solenoid valve, for example in a contactor type device. A switching power supply 14 includes a winding S1 powering a control circuit 15 and another winding S2 placed with a switch T2 at the coil terminal... | 12/07/1999 |
| 5956238 | Blocking time maintenance circuit for ZVS converters The blocking time maintenance circuit is applied to a resonant-transition ZVS power converter having saturable core reactors to induce a current in the primary of the transformer which enables ZVS. The circuit includes a peak detector for producing a sign... | 09/21/1999 |
| 5661390 | Inverter-fed motor drive with EMI suppression This invention provides cost-effective suppressing conducted radio-noise emissions from industrial inverter-motor drives whose EMI performance is able to meet the CISPR or FCC limits on conducted emissions. The invention includes some small size L,C filte... | 08/26/1997 |
| 5075839 | Inductor shunt, output voltage regulation system for a power supply High efficiency, post regulation of auxiliary outputs in multiple output-power supplies is provided by connecting a regulating switching device in parallel with a filter inductor connected in the current path from the rectifiers to the output terminal. Fo... | 12/24/1991 |
| 4967335 | Saturable transformer regulator for flyback power supply A flyback type power supply has a nominal 12 volt secondary winding that is connected to a rectifier through the primary winding of a saturable transformer. The secondary winding of the saturable transformer is connected in series with the DC load current... | 10/30/1990 |
| 4949235 | Magnetic amplifier shutdown circuit A power supply (100) for producing a regulated output DC voltage from an AC voltage source (12) having at least one phase (14); a fullwave rectifier (16) coupled to the AC voltage source for producing a rectified output voltage potential, the fullwave rec... | 08/14/1990 |
| 4931918 | Ringing choke converter A ringing choke converter power supply device comprising a ringing choke converter power supply for stabilizing an output voltage by an indirect feedback system; a variable impedance element provided on a primary or secondary side of the power supply; and... | 06/05/1990 |
| 4931920 | Circuit and method for regulating output voltage of a switch mode power supply having a current mode magnetic amplifier A circuit for regulating the output voltage of a switched mode power supply having a current mode magnetic amplifier includes a current transformer for sensing current flow through the magnetic amplifier. The sensed current is provided to a circuit which ... | 06/05/1990 |
| 4899271 | Power supply circuit A power supply circuit comprising a transformer and rectifier diodes, where the ends of the secondary winding are connected to uniform first electrodes of a pair of rectifier diodes (D1, D2) whose second electrodes are connected to one output terminal (-)... | 02/06/1990 |
| 4811187 | DC-DC converter with saturable reactor reset circuit A DC-DC converter having a transformer having a primary winding and a secondary winding; means for supplying DC input voltage to the primary winding; at least one switching element connected between the DC input voltage supplying means and the primary win... | 03/07/1989 |
| 4688162 | Rectifier control apparatus with improved power factor A single phase, full wave diode bridge circuit is connected with a chopper on its DC output side. An output voltage of the chopper is smoothed by a smoothing capacitor and thereafter supplied for a load. A current control apparatus forms a current referen... | 08/18/1987 |
| 4683529 | Switching power supply with automatic power factor correction An off-line switching power supply is described which controls the switching transistor of a fly-back circuit in such a fashion as to achieve better than 0.99 power factor control. The technique used for power factor control allows the switching power sup... | 07/28/1987 |
| 4661898 | Precision constant current control with automatic compensation A circuit is provided having an alternating current input and a synchronous switch means which has a control coil--such as a saturable reactor--with the input, so as to control the energy throughput of the synchronous switch means and therefore the output... | 04/28/1987 |
| 4553199 | High frequency power supply device A high frequency power supply device has an inverter circuit and an output circuit connected thereto. The inverter circuit includes a diode and a capacitor being connected in parallel to an output side of a switching transistor. A drive input voltage of t... | 11/12/1985 |
| 4480178 | Tuning arrangement for interfacing credit card-like device to a reader system A circuit for maximizing power transfer from a station to an interactive memory card via a capacitive interface. A reader system in the station generates an ac signal which provides operating power that is transferred to the card through the capacitive in... | 10/30/1984 |
| 4468723 | Magnetically regulated power supply Apparatus is disclosed for controlling the regulating inductance of a power supply by applying across a control winding mounted on the same core a voltage having a volt-second product proportional to the difference between a desired output voltage and the... | 08/28/1984 |
| 4447866 | Supplement to cross regulation in DC to DC converters A variable inductance is placed in series with the diode rectifiers of the auxiliary outputs of a dc-to-dc converter. Increasing or decreasing the value of this inductance affects only the permeance of leakage flux paths which link the transformer winding... | 05/08/1984 |
| 4419723 | Regulation of multiple-output DC-DC converters A multiple-output DC-DC converter has an electronically controllable reactor (64,66) connected in series with each output circuit. In response to variations in voltage of the output circuits (80,82), control signals are fed back to vary the permeance of t... | 12/06/1983 |
| 4343034 | Magnetic amplifier preregulator for linear power supplies A linear power supply is preregulated to compensate for variations in load and power line voltage. The inductance on the primary side of the power supply step down transformer is varied by a current controlled inductor to efficiently maintain the desired ... | 08/03/1982 |
| 4291366 | Switching regulated power supply A switching regulated power supply operates over a broad range of input voltage and frequency, and outputs direct current power for computer equipment and the like. The power supply can be paralleled with identical power supplies, thereby satisfying any p... | 09/22/1981 |
