Did You Know...
...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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 |
| 8189354 | Voltage converter with high efficiency A voltage converter transmits energy in multiple stages using a charge pump so as to decrease the voltage rating of the secondary side of the transformer and reduce the size of the transformer. Meanwhile, the voltage converter stores and recycles the leakage inducta... | 05/29/2012 |
| 8184458 | Power converter load line control A snubber circuit for a switching converter. A power source has a first rail and a second rail. A snubber transformer has a primary winding and a secondary winding, a first end of each of the primary and secondary windings being coupled together to form a transforme... | 05/22/2012 |
| 8107268 | Passive lossless snubber cell for a power converter A passive lossless snubber cell for a switched-mode power converter comprises an energy absorbing circuit and an energy resetting circuit coupled to said energy absorbing circuit. The energy absorbing circuit is arranged to release energy stored in a snubber capacit... | 01/31/2012 |
| 8009448 | Forward-flyback converter with active-clamp circuit The present invention discloses a forward-flyback converter with active-clamp circuit. The secondary side of the proposed converter is of center-tapped configuration to integrate a forward circuit and a flyback circuit. The flyback sub-circuit operating continuous c... | 08/30/2011 |
| 7706158 | Amplifier with switchmode power supply An amplifier is driven by DC voltage from a switchmode power supply, whereby the switchmode power supply includes on the primary side a primary winding and bias supply winding. The bias supply winding supplies a reflected voltage from a secondary winding to a bias s... | 04/27/2010 |
| 7649757 | Leakage-inductance energy recycling circuit and flyback converter with leakage-inductance energy recycling circuit A flyback converter with a leakage-inductance energy recycling circuit includes a transformer and a leakage-inductance energy recycling circuit. The leakage-inductance energy recycling circuit includes a clamping circuit, an energy storage circuit, and a switch conn... | 01/19/2010 |
| 7408793 | Active snubber An improved snubber is electrically switched to close a current path to a capacitor (C) in a series connected RC circuit at the onset of an abrupt voltage change otherwise producing ringing in a resonant circuit to which the snubber circuit is connected. The current... | 08/05/2008 |
| 7385833 | Snubber circuit for a power converter A snubber circuit and corresponding power converter topology for controlling the voltage across the resonant capacitor at turn on of a control switch so as to suppress a spike at the switch caused by the large current pulse and parasitic inductance of the power conv... | 06/10/2008 |
| 7372711 | Circuit and method for reducing voltage spikes due to magnetizing current imbalances and power converter employing the same For use in a power converter having parallel power trains, a circuit for, and method of, reducing voltage spikes due to magnetizing current imbalances in the power trains and a power converter incorporating the circuit or the method. In one embodiment, the circuit i... | 05/13/2008 |
| 7365996 | Switched-mode power supply A switched-mode power supply for converting a DC input voltage (Uzk) into an output voltage (Ua). The switched-mode power supply comprises a circuit (AST) for triggering at least one controlled switch (S) that periodically applies the input voltage to at least one p... | 04/29/2008 |
| 7352158 | SEPIC synchronous rectification A SEPIC converter having synchronous rectification, accommodating changes in the converter duty cycle, and the ringing conditions when the converter changes operation from a continuous mode to a discontinuous mode, and back. Conductive losses are significantly reduc... | 04/01/2008 |
| 7352136 | DC-DC converter with reduced surge voltage and an electronic ballast including the converter for a discharge lamp A DC-DC converter reduces a surge voltage developed across a switching element (30) in making the voltage conversion with the use of a transformer (20) inherently having considerable leakage. A snubber circuit is included to absorb the surge energy and... | 04/01/2008 |
| 7348845 | System and method for employing variable magnetic flux bias in an amplifier A system and method for employing variable magnetic flux bias in an amplifier. The amplifier system comprises an output transformer and a magnetic sensor configured to sense a first magnetic flux of the output transformer. The magnetic sensor generates a flux signal... | 03/25/2008 |
| 7301789 | Adjustable speed drive protection A protection scheme to protect pulse width modulated drives is described. The scheme is implantable in both hardware and software and combinations thereof. The semiconductor devices of the drive are protected from transient signals such as power line spikes and loss... | 11/27/2007 |
| 7301788 | Power transform device and electronic device for reaching low acoustic noise A low acoustic noise solution for snubber circuits is utilized for relieving spike noise under a low-load mode of a snubber circuit, and for avoiding electromagnetic interference under a high-load mode of said snubber circuit. A power transform device utilizing the ... | 11/27/2007 |
| 7298631 | Switching power source apparatus A switching power source apparatus can reduce the size of a transformer and realize the zero-voltage switching of a switch. The apparatus is compact, highly efficient, and low in noise. The apparatus has a series circuit connected to each end of a DC power source (V... | 11/20/2007 |
| 7233507 | Non dissipative snubber circuit with saturable reactor A new type of the passive non-dissipative snubber with a single saturable reactor improves the performance of the boost converter used as a front-end active Power Factor Correction (PFC) in two critical areas: excess voltage stresses caused by high voltage spikes on... | 06/19/2007 |
| 7193870 | Method and apparatus for dissipative clamping of an electrical circuit Dissipative clamping apparatuses and methods for electrical circuits. In one aspect of the invention, In one aspect of the invention, a method includes switching a power supply input on an energy transfer element, regulating a power supply output by switching the po... | 03/20/2007 |
| 7184279 | Solid state switching circuit A solid state switching circuit utilizes a transformer in series with the circuit's switching device by which energy initially stored in the primary of the transformer is recovered in resonant circuitry connected to the secondary of the transformer for transfer of t... | 02/27/2007 |
| 7130203 | Switching power supply with a snubber circuit A DC/DC power supply with two transformers (10, 20), which for example are connected in parallel on the primary and in series on the secondary side, comprises two passive, non-dissipative snubber circuits (1.1, 1.2). Each snubber circuit comprises a se... | 10/31/2006 |
| 7130204 | Switching power source apparatus A switching power source apparatus can reduce the size of a transformer and realize the zero-voltage switching of a switch. The apparatus is compact, highly efficient, and low in noise. The apparatus has a series circuit connected to each end of a DC power source (V... | 10/31/2006 |
| 7123462 | Load control device A load control device having a power control element connected in series to a series circuit of a load and an alternating power supply and a snubber circuit comprises suppressing means for suppressing current flowing through the snubber circuit when the load is not ... | 10/17/2006 |
| 7062726 | Method for generating tech-library for logic function The present invention is directed to a method for generating a tech-library for a logic function. A logic function has many representations. For each representation, a circuit for realizing the representation is decomposed into a combination of instances. An instanc... | 06/13/2006 |
| 7049786 | Unipolar drive topology for permanent magnet brushless DC motors and switched reluctance motors A unipolar drive includes a booster, an energy storage module, and a unipolar inverter. The booster increase a voltage received from a power supply to produce an energy output. The energy storage module store at least some of the energy output by the booster. The un... | 05/23/2006 |
| 7042161 | Ballast with arc protection circuit FA ballast (20) for powering a gas discharge lamp (70) comprises an inverter (200) and an arc protection circuit (600). Arc protection circuit (600) monitors an electrical signal within the ballast. In response to occurrence of a d... | 05/09/2006 |
| 7023714 | Voltage converter for a power supply A SEPIC type voltage converter (101) comprises a transformer (40) having a primary winding (41) and a storage capacitor (33) connected in series, and a controllable switch (51) coupled in parallel with said series combination. The ... | 04/04/2006 |
| 6975097 | Unitary magnetic coupler and switch mode power supply The invention relates to a unitary magnetic coupler including a first inductor (Lp) consisting of a first winding of phase φ and having a number N of turns between the two ends of the first winding and, magnetically coupled to the first inductor (Lp), a second indu... | 12/13/2005 |
| 6947299 | Method and apparatus for dissipative clamping of an electrical circuit Dissipative clamping apparatuses and methods for electrical circuits. In one aspect of the invention, In one aspect of the invention, a method includes switching a power supply input on an energy transfer element, regulating a power supply output by switching the po... | 09/20/2005 |
| 6944036 | DC/DC converter with voltage clamp circuit In those conventional arts, a DC/DC converter with secondary clamp circuit has a problem of voltage oscillation, and a DC/DC converter with primary clamp circuit has problems of heat and clamping losses due to larger forward and reverse currents passing the primary ... | 09/13/2005 |
| 6917529 | Unregulated DC-DC converter having synchronous rectification with efficient gate drives An unregulated DC-to-DC power converter suitable for intermediate bus voltage converter applications includes synchronous rectifiers that are driven efficiently to provide faster transition time and reduced loss. The DC-to-DC power converter comprises a transformer ... | 07/12/2005 |
| 6900996 | Method and apparatus for controlling a DC-DC converter Method and apparatus for controlling a DC-DC converter change the switching frequency of the switching devices and the on-off ratio of the switching devices. The on-off ratio can be changed in response to the output voltage and the switching frequency can be changed... | 05/31/2005 |
| 6898095 | Bidirectional VSC converter with a resonant circuit The invention relates to a VSC-converter for converting direct voltage into auxiliary voltage and vice versa, which comprises a series connection of at least two current valves (5, 6) arranged between two poles (7, 8), a positive and a negative, of a d... | 05/24/2005 |
| 6882548 | Auxiliary active clamp circuit, a method of clamping a voltage of a rectifier switch and a power converter employing the circuit or method The present invention is directed to an auxiliary active clamp circuit and a method of clamping a voltage of a rectifier switch associated with a power converter. The power converter includes a main active clamp circuit associated with a main power switch coupled to... | 04/19/2005 |
| 6862194 | Flyback power converter having a constant voltage and a constant current output under primary-side PWM control A primary-side flyback power converter supplies a constant voltage and a constant current output. To generate a well-regulated output voltage under varying load conditions, the power converter includes a PWM controller. The PWM controller generates a PWM signal to c... | 03/01/2005 |
| 6853563 | Primary-side controlled flyback power converter The present invention provides a primary-side flyback power converter that supplies a constant voltage output and a constant current output. To generate a well-regulated output voltage under varying load conditions, a PWM controller is included in the power converte... | 02/08/2005 |
| 6813172 | Power supply circuit for video display device A power supply circuit for a video display device including a power transformer for inducing a voltage with respect to an input voltage by using an interaction occurring between a primary coil and a secondary coil; a switching circuit unit for controlling the voltag... | 11/02/2004 |
| 6813171 | Dissipative clamping of an electrical circuit with a clamp voltage varied in response to an input voltage Dissipative clamping apparatuses and methods for electrical circuits. In one aspect of the invention, In one aspect of the invention, a method includes switching a power supply input on an energy transfer element, regulating a power supply output by switching the po... | 11/02/2004 |
| 6801443 | Power supply with snubber circuit A method and apparatus for providing welding-type power supply is disclosed. It includes an inverter power circuit, a bus inductor, a snubber circuit a snubber capacitor voltage feedback circuit, and a control circuit. The inverter circuit includes a bus, switches, ... | 10/05/2004 |
| 6784644 | Multiphase clamp coupled-buck converter and magnetic integration Voltage regulation, transient response and efficiency of a voltage regulator module (VRM) is improved where short duty cycles are necessitated by large differentials of input and output voltage by including at least one clamping of a tap of an inductance in series w... | 08/31/2004 |
| 6778413 | Asymmetric multi-converter power supply including a fast response converter An asymmetric multi-converter power supply including a first converter and a second converter coupled to provide power to an output node. A control circuit is coupled to the second converter and is configured to selectively enable the second converter depending upon... | 08/17/2004 |
