Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 5619402 | Higher-efficiency cold-cathode fluorescent lamp power supply A switched-mode power supply for energizing a cold-cathode fluorescent lamp ("CCFL") includes a first semiconductor switch connects in series with a primary winding of a step-up transformer. The primary winding and a secondary winding, having many more tu... | 04/08/1997 |
| 5612856 | Circuit arrangement for producing a direct voltage with reduction of harmonic and high-frequency interferences A description is given of a circuit arrangement for producing at least an output direct voltage (at 18, 19) from an at least significantly sinusoidal input a.c. voltage (at 2, 3) of a first frequency, comprising a first rectifier device (1), to which the ... | 03/18/1997 |
| 5583751 | Power supply unit for electric motor vehicle A main switch with a low withstand voltage usable to prevent a leak current from flowing from a floated running power supply by way of the main switch even when the insulation between the main switch and the body grounding is reduced. A running power supp... | 12/10/1996 |
| 5570278 | Clamped continuous flyback power converter Size reduction in a clamped power converter can be achieved, and stability of the converter under no-load and transient loads can be substantially improved, by operating the converter in a continuous flyback mode.... | 10/29/1996 |
| 5563780 | Power conversion array applying small sequentially switched converters in parallel Decreased input and output ripple current and ripple voltage on a switched mode power conversion array is realized at high power levels and frequencies by coupling an input power signal across an input capacitance to which a plurality of smaller power con... | 10/08/1996 |
| 5555165 | Current detection in power conversion Power is delivered from an input source to a load via a first capacitor in a series of energy transfer cycles, and a rate of change of voltage across the first capacitor is sensed as an indication of current flowing in the first capacitor.... | 09/10/1996 |
| 5535112 | DC/DC conversion circuit A DC/DC conversion circuit of the type that implements the "forward PWM" topology includes a DC/AC converter, a self-driven synchronous rectifier which rectifies the alternating voltage signal coming from the DC/AC converter, and a filter that filters the... | 07/09/1996 |
| 5528482 | Low loss synchronous rectifier for application to clamped-mode power converters A synchronous rectifier for use with a clamped-mode power converter uses in one embodiment a hybrid rectifier with a MOSFET rectifying device active in one first cyclic interval of the conduction/nonconduction sequence of the power switch and a second rec... | 06/18/1996 |
| 5528481 | Low noise multi-output and multi-resonant flyback converter for television power supplies A converter for supplying various output voltages for a television receiver includes a multi-resonant circuit, including a resonant inductor, the leakage inductance of a flyback transformer, and a charging capacitor (including the parasitic capacitance of... | 06/18/1996 |
| 5519598 | Load driving circuit This invention relates to a load driving circuit having a fail-safe breaking mechanism for breaking a primary power source when a failure occurs. This invention also relates to a load driving circuit capable of saving electricity in driving an inductive l... | 05/21/1996 |
| 5502628 | AC-DC converter An AC-DC converter is disclosed which is so designed as to realize an improved power factor and thereby minimize generation of voltage distortion and higher harmonies in power supply line, without making the circuit arrangement complex and bulky. A step-d... | 03/26/1996 |
| 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 |
| 5488551 | Pulse width modulated power supply which avoids excessive on-time of switch during start-up A pulse width modulated power supply comprises a power transformer having a primary winding, a secondary winding and means for coupling one end of the primary winding to a DC power supply. A semiconductor switch is coupled to the other end of the primary ... | 01/30/1996 |
| 5477175 | Off-line bootstrap startup circuit A novel off-line bootstrap startup circuit (10) including a high voltage device (100) for providing an initial bias voltage to an integrated circuit (IC) is provided. The high voltage device includes an NMOS transistor (102) having a high source to ground... | 12/19/1995 |
| 5471376 | Low-loss active voltage-clamp circuit for single-ended forward PWM converter Transformers (T1, T2), switches (M1) and (M2), rectifiers (DR1, DR2, DR3, DR4) and low-pass filter (LF, CF) form a basic power train circuit (12). Auxiliary switches (A1, A2), diodes (DS1, DS2) and capacitors (CS1, CS2) form active clamp circuit (10). The... | 11/28/1995 |
| 5457620 | Current estimating circuit for switch mode power supply In a switch mode power supply the switch current of the power switch is connected to a low pass filter network during the time interval when current is flowing through the power switch. The filter network is disconnected from the power switch when switch ... | 10/10/1995 |
| 5455757 | Power converter having regeneration circuit for reducing oscillations A power converter including a complementary regeneration circuit for eliminating oscillations and conserving leakage energy to increase the efficiency of a flyback power converter. The complementary regeneration circuit includes a regeneration capacitor, ... | 10/03/1995 |
| 5452195 | Start-up circuit for a switch mode power supply An integrated control circuit forms a driver stage of an output transistor of a switch mode power supply. During a start-up interval of a run mode operation, the control circuit does not consume supply current and does not produce a switching control sign... | 09/19/1995 |
| 5442536 | Low-loss power supply device comprising a DC/DC converter A low loss power supply device for generating at least one output voltage (Ua) from an input voltage (Ue) having an absolute value which is higher than that of the output voltage. The power supply device has a low power loss and minimum space requirements... | 08/15/1995 |
| 5440472 | Integrated magnetic power converter An integrated magnetic power converter for supplying power to a load includes a continuous magnetic structure having first and second oppositely disposed legs, and third and fourth oppositely disposed legs and a magnetic path therebetween. A first winding... | 08/08/1995 |
| 5430633 | Multi-resonant clamped flyback converter A flyback-type power converter having a secondary-side resonant circuit which shapes the current waveform in the secondary winding and secondary circuit to reduce the RMS current values therein is described. The shaping reduces conduction losses and impro... | 07/04/1995 |
| 5430640 | Power supply A power supply for use in electronic apparatuses is disclosed, and the power supply is provided with a switching control circuit for controlling the switching operations of a switching device of a rectifying portion, thereby making the switching device mo... | 07/04/1995 |
| 5410467 | Power converters with improved switching efficiency A Circuit for reversing the direction of current flow in a rectifying device of a power converter during a time interval just prior to when the rectifying device is to be rendered non-conductive is described. The current reversal substantially reduces or ... | 04/25/1995 |
| 5394319 | Non-coupled integrated magnetic structure An integrated, non-coupled structure comprises a body of ferrite material with a plurality of through passages. A plurality of conductors pass through respective ones of the passages to form windings, certain of which have no magnetic field coupling and h... | 02/28/1995 |
| 5390101 | Flyback power supply having a VCO controlled switching rate A DC-DC current-mode controlled flyback switching power supply provides a high efficiency of operation throughout a wide range of input voltages. An error amplifier produces an error signal from the difference between a reference voltage and an output vol... | 02/14/1995 |
| 5379206 | Low loss snubber circuit with active recovery switch A switch mode power converter includes a snubber diode and a snubber capacitor arranged in series with one another across the switching element of the converter. A discharge path is provided for discharging the capacitor by including a second diode, a swi... | 01/03/1995 |
| 5377090 | Pulsed power converter with multiple output voltages A distributed power system for providing multiple output voltages, including pulsed voltages, to a solid-state phased-array radar transmit/receive module, for example, includes: an energy-storage capacitor for coupling to an input dc power source and for ... | 12/27/1994 |
| 5373432 | Fixed frequency DC to DC converter with a variable inductance controller A DC to DC converter (50, 60, 70) that includes a switching circuit (10) responsive to a DC input, a magnetic amplifier controller (20) responsive to the switching circuit for providing an AC output, and an AC current to DC voltage rectifying circuit (30)... | 12/13/1994 |
| 5365421 | Pulse transformer having plural simultaneously operable primary windings and a single secondary winding A pulse transformer circuit which comprises a transformer core having a plurality of individual primary windings and a secondary winding, a plurality of preferably single turn primary circuits, each primary circuit coupled to a different one of the primar... | 11/15/1994 |
| 5363287 | Low noise multi-output and multi-resonant forward converter for television power supplies A forward converter for supplying various output voltages for a television receiver includes a multi-resonant circuit, including a resonant inductor, a charging capacitor, and the output capacitors across each secondary winding of an output transformer. T... | 11/08/1994 |
| 5343140 | Zero-voltage-switching quasi-resonant converters with multi-resonant bipolar switch A compact, high frequency, zero voltage switching quasi-resonant converter with a multi-resonant, bi-polar switch includes a resonant switch (S), a first diode (Dp) in parallel with the switch (S), a second diode (Ds)in series with t... | 08/30/1994 |
| 5331534 | Power supply apparatus A power supply apparatus has a full-wave rectifier for rectifying an AC voltage from an AC power source to output a DC pulsating voltage, and a high-frequency inverter which performs an oscillating operation to generate an output voltage. A first capacito... | 07/19/1994 |
| 5331532 | High voltage regulating circuit A coil (11) is connected in series to a primary winding (1a) of a flyback transformer (1). A series circuit of a capacitor (15) and a switching circuit (12) is connected in parallel to the coil (11). By turning on and off the switching circuit (12), the c... | 07/19/1994 |
| 5331533 | Zero voltage switching power converters A circuit for utilizing the magnetizing current in the transformer of a power converter to reset the transformer's core and to provide a zero voltage switching condition on the converter's primary switch is disclosed. The transformer includes a primary wi... | 07/19/1994 |
| 5327334 | Zero current switching DC-DC converter incorporating a tapped resonant inductor A current resonance DC-DC converter has a ZCS resonance switch circuit which comprises a semiconductor switch device 7 and a diode 8 connected together into a parallel circuit, the diode 8 being connected at its cathode to one end of a DC power supply 1, ... | 07/05/1994 |
| 5309344 | Dual active clamp, zero voltage switching power converter A dual active clamp (DAC) converter comprising two active-clamp, zero-voltage switching (ZVS) converters for converting electrical power from an input source to an output load is described. The two active-clamp ZVS converters are coupled in parallel to on... | 05/03/1994 |
| 5303138 | Low loss synchronous rectifier for application to clamped-mode power converters A synchronous rectifier for use with a clamped-mode power converter uses in one embodiment a hybrid rectifier with a MOSFET rectifying device active in one first cyclic interval of the conduction/nonconduction sequence of the power switch and a second rec... | 04/12/1994 |
| 5293111 | Method for minimizing the switching loss in a power switch A switching current converter is connected in parallel with each controlled power switch in an electric circuit so that it is allowed to operate from the input voltage and transfer energy from input to output during the turn-on periods of the controlled p... | 03/08/1994 |
| 5291382 | Pulse width modulated DC/DC converter with reduced ripple current coponent stress and zero voltage switching capability An improved DC to DC converter is provided in particular for converters with high power density requirements. The converter comprises an input voltage source and a capacitor connected in series to the voltage source. A switching transistor configuration c... | 03/01/1994 |
| 5291385 | Zero-current switching forward power converter operating in damped reverse boost mode In a zero-current switching forward converter both a unidirectional conducting device and a circuit consisting of a switch in series with a dissipative element are connected across the energy transfer capacitor in the output circuit of the converter. The ... | 03/01/1994 |
