Bizarre Patents
Decorative Jeweled Wheel Cover
An improved wheel is provided wherein decorative items such as gem stones are embedded in either the wheel surface, a special mounting section attached to the wheel surface, or to a spoke strap that wraps around each spoke and positions embedded gem stones on the outside surface of the spoke.
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 |
| 7397676 | Class E amplifier with inductive clamp A power supply including an inverter receiving a DC input signal from a DC input source (11). The inverter is implemented as a single-ended inverter. Each inverter is driven by a signal source (13A, 13B), which outputs an AC signal. The output f... | 07/08/2008 |
| 7394671 | Controller IC, DC-AC conversion apparatus, and parallel running system of DC-AC conversion apparatuses A DC power source voltage is supplied to a center tap of a primary winding, and first and second semiconductor switches alternately turned on are disposed between each of both ends of the primary winding and a common potential point, and a current flowing through a ... | 07/01/2008 |
| 7324356 | Common-mode current cancellation with digital pulses for isolated applications A mechanism for reducing common-mode current in a system including a first subsystem and an isolated subsystem. The isolated subsystem may receive the common-mode current from the first subsystem via an isolation mechanism. The isolation mechanism (e.g., a transform... | 01/29/2008 |
| 7254046 | DC-DC converter In a DC to DC converter, first and second primary windings are magnetically coupled to a first secondary winding. Third and fourth primary windings are magnetically coupled to a second secondary winding. The first and second primary windings are magnetically coupled... | 08/07/2007 |
| 7248488 | DC-AC converter, and method for supplying AC power First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to... | 07/24/2007 |
| 7180758 | Class E amplifier with inductive clamp A power supply including an inverter receiving a DC input signal from a DC input source (11). The inverter is implemented as a single-ended inverter. Each inverter is driven by a signal source (13A, 13B), which outputs an AC signal. The output f... | 02/20/2007 |
| 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 |
| 7126831 | DC-AC converter, and method for supplying AC power First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to... | 10/24/2006 |
| 7046526 | DC-AC converter, and method for supplying AC power First and second semiconductor switches which are activated alternately are provided between ends of a primary winding and a common potential point, wherein a DC power supply voltage is supplied to a center tap. An electric current flowing into a load is fed back to... | 05/16/2006 |
| 7026727 | Power supply with multiple transformer current sharing Devices and methods for using multiple transformers to provide a power supply to a device or system. Included are systems for using multiple transformers and multiple fuses or circuit breakers to provide a power supply. In one embodiment two transformers and two fus... | 04/11/2006 |
| 6885567 | Class E amplifier with inductive clamp A power supply including an inverter receiving a DC input signal from a DC input source (11). The inverter is comprised of two half bridges (S1 A, S2A and S1B, S2B). Each inverter is driven by a signal source (13A, 13... | 04/26/2005 |
| 6807072 | Electric power conversion device with push-pull circuitry An electric power conversion device comprises switching elements 2a, 2b making up a push-pull converter, a pulse transformer T, a rectification diode D1, a rectification diode D2, a choke coil L, a smoothing capacitor C, a D... | 10/19/2004 |
| 6754091 | Pulse width modulated push-pull driven parallel resonant converter with active free-wheel An apparatus and method for high frequency alternating power generation to control kilowatts of supplied power in microseconds. The present invention includes a means for energy storage, push-pull switching means, control electronics, transformer means, resonant cir... | 06/22/2004 |
| 6639814 | Constant voltage reset circuit for forward converter A constant voltage reset circuit used in a forward converter for the holdup time requirement or the wide input voltage range is disclosed. In one embodiment, the constant voltage reset circuit comprises a reset capacitor, a parallel-coupled switch, and a ... | 10/28/2003 |
| 6275391 | Compact push-pull converter and crowbar circuit, and control therefor A push-pull converter, coupled through an isolation transformer to a crowbar circuit for controlling an isolated output voltage across an output capacitor, has a compact circuit arrangement with a minimal number of components. The switching devices of the... | 08/14/2001 |
| 6018467 | Resonant mode power supply having an efficient low power stand-by mode A resonant mode power supply includes a D.C. voltage source and switching elements for alternatively connecting an oscillating circuit, including a primary winding of a transformer, to the D.C. voltage source and to ground. A first secondary winding suppl... | 01/25/2000 |
| 5715150 | Inverter output circuit In an inverter power supply with an output transformer including a core of magnetically permeable material with an effective area, a primary winding on the core and a secondary output winding on the core; a pulse width modulator with a first output polari... | 02/03/1998 |
| 5495405 | Inverter circuit for use with discharge tube An inverter circuit for use with a discharge tube or lamp such as a cold-cathode fluorescent lamp, a hot-cathode fluorescent lamp, a mercury arc lamp, a metal halide lamp, a neon lamp or the like is provided. The secondary side circuit of a step-up transf... | 02/27/1996 |
| 5140513 | Switching regulated DC-DC converter using variable capacity diodes in the feedback circuit A switching regulated power supply, the output voltage of which is regulated according to a pulse width modulation method, is provided with a reference oscillator for generating first and second synchronizing signals, phases of which are complement each o... | 08/18/1992 |
| 4937470 | Driver circuit for power transistors A gate driver circuit is provided for push-pull power transistors. Inverse square wave signals are provided to each of the driver circuits for activating the power transistors. The combination of an inductor and diodes provides a delay for activating the ... | 06/26/1990 |
| 4897773 | Inverter output circuit There is provided an improvement in an inverter power supply of the type including an output transformer of the type having a high permeability magnetic core, input winding means for applying input current pulses to the core; a first output winding wound ... | 01/30/1990 |
| 4829415 | Push-pull drive circuit for a power converter A power supply includes a source of first and second switching signals that are at opposite phases. First and second MOS power transistors have main current conducting electrodes coupled to a transformer and have gate electrodes that are respectively coup... | 05/09/1989 |
| 4751628 | Automatic symmetry correction circuit for a symmetrical current chopper An automatic symmetry correction circuit is provided for a symmetrical current chopper. This structure includes two current channels controlled alternately by two signals of frequency f. A resonant LC circuit is tuned to the frequency f and energized by the ... | 06/14/1988 |
| 4700282 | Monolithically integratable control circuit having a push-pull output stage for the switching of inductive loads A monolithically integratable control circuit for the switching of inductive loads, have a push-pull output stage formed by transistors each having their base terminal connected to a control circuit and to a charge extraction transistor driven to conduct ... | 10/13/1987 |
| 4665475 | Current converter Current converter comprising a rectifier circuit and a converter transformer at the primary side of which a damping network is arranged, the damping network comprising a blocking oscillator circuit.... | 05/12/1987 |
| 4642749 | Replica driver transformer for inverter circuit An inverter circuit having an output power transformer if provided with a replica driver transformer which is a miniature "clone" of the power transformer. The replica driver transformer uses the same core material as the power transformer and is designed... | 02/10/1987 |
| 4598351 | Soft-start control for a push-pull converter-regulator with a flux balancing circuit A soft-start control for use with a push-pull converter-regulator having a flux balancing circuit. The push-pull converter is responsive to a pulse width modulated waveform to provide a DC output, the converter having an error amplifier for comparing the ... | 07/01/1986 |
| 4564800 | Battery charger A switch-mode battery charger in which a pair of field effect transistors are operated at a relatively high switching rate. Protection against excessive overload is provided by directly monitoring the pulse trains produced by the transistors rather than t... | 01/14/1986 |
| 4564896 | Inverter with improved operating efficiencies An inverter circuit is provided for use with a DC power supply and includes a transformer having a center-tapped primary coil and a secondary coil as well as a switch and a switch controller operating to maintain a constant RMS output voltage. Improvement... | 01/14/1986 |
| 4553198 | Power converter symmetry correction circuit A pulse width modulated power converter having a single time multiplexed symmetry correction circuit operative to vary the pulse width of output drive pulses applied to an output transformer. As a result, the average current and thus the volt second produ... | 11/12/1985 |
| 4542450 | Electrical converter including gain enhancing means for low gain transistors An electrical converter for supplying electrical power to a load from a d.c. source and which includes semi-conductor switching means for converting a direct input current to an alternating current and output transformer means fed with the alternating cur... | 09/17/1985 |
| 4519023 | Self-oscillating inverter including a DC to DC converter and method for control thereof A self oscillating inverter including a DC to DC converter and method for control thereof which senses the onset of a transformer core saturation to control its operation without dependence thereon. Linearizing inductors in the transformer secondary funct... | 05/21/1985 |
| 4480297 | Synchronizing circuit for push-pull inverter A direct current to alternating current inverter with an output transformer is regulated by a pulse width modulator which alternately closes one of two switches connected with the center tapped primary winding of the output transformer. A synchronizing ci... | 10/30/1984 |
| 4477867 | Core saturation control circuit A closed-loop core saturation control circuit for use in pulse width modulated power supplies is disclosed. The circuit uses a single transistor as a unity gain, low impedance track and hold amplifier to sense the current in the primary winding of the tra... | 10/16/1984 |
| 4464606 | Pulse width modulated dimming arrangement for fluorescent lamps An energy-efficient ballast or energizing circuit for fluorescent lamps which is relatively uncomplicated and which can be manufactured relatively simply and inexpensively. An on-off switch and dimming means are connected in a low-voltage portion of the c... | 08/07/1984 |
| 4456949 | Overlap control system for push-pull switching mode inverter power supply An overlap control system is provided in a push-pull switching mode inverter power supply which prevents a second switching transistor from being turned on after a first switching transistor has been turned off until the end of the storage time of the tra... | 06/26/1984 |
| 4424556 | Self-oscillating DC to DC converter A self-oscillating DC to DC converter which includes either two or four transistors, three transformers (a converting transformer, a driving transformer and a current transformer) and an inductance. The operating frequency of the converter is fixed by the satu... | 01/03/1984 |
| 4336587 | High efficiency turn-off loss reduction network with active discharge of storage capacitor A turn-off loss reduction network is applied to the power transistors of a double-ended inverter circuit to reduce power dissipation therein. A switched resonance discharge circuit is utilized to discharge the storage capacitor of the turn-off loss reduct... | 06/22/1982 |
| 4334267 | Free-running push-pull inverter A power transformer of an inverter power supply has a primary winding coupled to a source of DC voltage. First and second transistor switches are coupled to the primary winding in a push-pull arrangement. A drive winding of a saturable transformer is coup... | 06/08/1982 |
| 4319315 | D.C. to D.C. converter A D.C. to D.C. converter is disclosed which includes a first and a fourth, and a second and a third, sequentially operating transistors. The D.C. to D.C. converter further includes a saturable transformer having a center-tap and resistive networks interpo... | 03/09/1982 |
