Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7190208 | Self-oscillating full bridge driver IC A self-oscillating full-bridge driver IC, in which the high-side drivers each have a bootstrap capacitor, and a bootstrap circuit for pre-charging the bootstrap capacitors before starting up the oscillator or supplying control signals to the high-side drivers. ... | 03/13/2007 |
| 6982531 | Driving circuit for switches of direct current fan motor A driving circuit for switches of direct current fan motor is disclosed. The driving circuit includes a plurality of switches, a first control circuit, and a second circuit. The switches are driven by a first pulse width modulation signal and a second pulse width mo... | 01/03/2006 |
| 6753717 | H-bridge driver An H-bridge driver has a drive signal generating circuit for generating a square-wave signal as a drive signal. The H-bridge driver also has a waveform shaping circuit for blunting the waveform of the drive signal at the rising and trailing edges thereof. The wavefo... | 06/22/2004 |
| 6617913 | Self-latching H-bridge system and apparatus A system and apparatus for controlling a motor or other multi-directional load using an H-bridge circuit having self-latching, high side switches. Thyristors are used as high side switches, and arranged to self-latch. The H-bridge thyristors are also arra... | 09/09/2003 |
| 6518819 | Push-pull output stage for digital signals with regulated output levels The circuit has a push-pull end stage which acts as an amplifier stage for digital signals. The push-pull end stage has two n-channel MOS transistors which function as source followers and two p-channel MOS transistors which also function as source follow... | 02/11/2003 |
| 6433629 | Micropower differential sensor measurement A sensing device includes a Wheatstone bridge and a source of a stimulation configured to apply the stimulation across two electrodes of the Wheatstone bridge. The device also includes a timing sensitive circuit configured to detect timing of a signal app... | 08/13/2002 |
| 6374043 | Fully-integrated VCM driver with controlled and predictable Class-AB linear operation A circuit (41) to provide drive voltages to a voice coil motor (VCM) (50) of a hard disk drive (10) has identical high and low side drivers (42, 44, 46, and 48) connected to the VCM (50). Each driver has an output FET (52) selectively connecting the VCM (... | 04/16/2002 |
| 6252440 | Write-driver circuit In a write driver circuit for switching the direction of a write current passing through a magnetic head or the like having an inductance component, an H-shaped bridge circuit is formed by using four NPN transistors in order to switch the write current at... | 06/26/2001 |
| 6211723 | Programmable load circuit for use in automatic test equipment A programmable load circuit operable to generate a plurality of test signals is described. The programmable load circuit comprises a diode bridge coupled between an input and an output. The diode bridge compares the voltage on the input to the voltage on ... | 04/03/2001 |
| 6211706 | Method and circuit for driving power transistors in a half bridge configuration allowing for excessive negative swing of the output node and integrated circuit incorporating the circuit A method and circuit for driving power transistors arranged in series in a half bridge configuration allowing for excessive negative swing of an output node between the transistors in the half bridge configuration. The series transistors are connected bet... | 04/03/2001 |
| 6163201 | Circuit for supplying a load with a direct voltage In a circuit for supplying a load with a direct voltage, a diode is connected in a current path for supplying the load, a step-up converter is connected in the current paths parallel with the diode, and a control unit drives the step-up converter accordin... | 12/19/2000 |
| 5900767 | Electronic devices comprising an array A large-area electronic device comprises an array (1) of device elements (2,3) coupled to row and column conductors (A and B). The column conductors (B) are arranged in groups, (e.g M, M+1, M+2), and a column multiplexer circuit (C) couples the column con... | 05/04/1999 |
| 5886563 | Interlocked half-bridge circuit A half-bridge circuit where the transistors comprising the half-bridge are electronically interlocked--precluding cross-conduction; and high-side voltage generation and logic level translation are integral to the interlock mechanism.... | 03/23/1999 |
| 5781059 | Driver circuit for semiconductor test system A driver circuit for a semiconductor test system generates test signals having predetermined voltage levels without being affected by stray capacitances. The driver circuit includes: a buffer amplifier for supplying test signals having predetermined volta... | 07/14/1998 |
| 5745003 | Driver circuits for IC tester A multi-level driver circuit comprises: (a) an output buffer; (b) a first switch for applying a first analog level to the output buffer when in a closed state; (c) a second switch for applying a second analog level to the output buffer when in a closed st... | 04/28/1998 |
| 5736890 | Method and apparatus for controlling transistors as rectifiers A rectifying device comprising of a SRMOS, an inductor, and a control circuit is disclosed. The SRMOS has a gate, a drain, and a source. The gate of the SRMOS is connected to the output of the control circuit. The inductor is connected to the drain of the... | 04/07/1998 |
| 5311151 | I/Q modulator and demodulator having a single bridge An IQ modulator/demodulator wherein the 90° phase quadrature branches of an input signal are connected to different terminals of a common bridge, from which also the quivalents I and Q signals are obtained. To the bridge is also connected a local oscilla... | 05/10/1994 |
| 5075837 | Blocking oscillator switching power supply with transformer demagnetization monitor circuit The transformer of a blocking oscillator converter is magnetized in a flux phase during which a switch on its primary side is switched on. In a blocking phase, in which the switch is switched off, the transformer is demagnetized by giving off energy to a ... | 12/24/1991 |
| 4958320 | Radiation resistant bipolar memory A bipolar memory of a construction having high immunity to soft error attributable to alpha rays is provided. The transistors of a flip flop, i.e., the essential circuitry of the memory cell, are inverted and the load device thereof has shielding means fo... | 09/18/1990 |
| 4858184 | Radiation resistant bipolar memory A bipolar memory of a construction having high immunity to soft error attributable to alpha rays is provided. The transistors of a flip flop, i.e., the essential circuitry of the memory cell, are inverted and the load device thereof has shielding means fo... | 08/15/1989 |
| 4705963 | AC controlled diode switch An a.c. switch has two pairs of diodes each of which has two diodes connected in back-to-back relationship between the signal input and output of the switch. The two pairs of diodes are connected in parallel with each other in opposite senses. A MOSFET tr... | 11/10/1987 |
| 4594573 | Reverberation sound generator A reverberation sound generator is provided for use as a warning generator for giving a warning to the driver of an automobile, for example. The reverberation sound generator has a capacitor connected in series with a power supply, a pair of diodes and a ... | 06/10/1986 |
| 4543495 | Diode bridge switching circuit with high attenuation A switching circuit is suitable for pulse modulating a high frequency carrier signal. The switching circuit provides little attenuation of the carrier signal while it is in its conductive state, but provides very high electrical isolation while in its non... | 09/24/1985 |
| 4535202 | Loop-circuit for telephone line A loop-circuit for a telephone line is provided that includes a transistor having a first electrode directly connected to one of the wires of the line, a second electrode connected to the other of the wires of the line by means of a resistor, a gate elect... | 08/13/1985 |
| 4482818 | Universal field convertible 3-wire switch A universal 3-wire switch module is provided for normally open and/or normally closed load control modes. The universal switch module is field convertible from P type DC to N type DC to P type AC to N type AC configurations as programmed by installation w... | 11/13/1984 |
| 4482817 | Bilateral electronic switch A bilateral, low loss, wide band, switching circuit controls the transfer of a signal between two terminals. The balance points of a bilateral current gate connect to the terminals. A rectifier forward-biases the bilateral current gate when a controllable... | 11/13/1984 |
| 4395690 | Two-terminal-pair network simulating an inductance A two-terminal-pair circuit which simulates an inductance includes input and output terminal pairs and a first ohmic resistor. The voltage-carrying terminal of the input terminal pair is connected to one terminal of the first ohmic resistor. The circuit i... | 07/26/1983 |
| 4360743 | Solid state control device for gradually turning on and off an electrical load A solid state control device is disclosed for gradually controlling the turn on and turn off of a light bulb. The light bulb is connected to an AC power source through a full wave rectifier having a semiconductor switching circuit connected across it whic... | 11/23/1982 |
| 4292550 | Gate control circuit with capacitor for field controlled thyristor The positive terminal of a series circuit consisting of two capacitors is connected with the cathode of a field controlled thyristor through a resistor and a transistor and the negative terminal thereof is connected with the gate of the field controlled t... | 09/29/1981 |
| 4239986 | Power control arrangement and control circuit especially suitable for use therewith An arrangement for controlling power during any given half cycle of AC power is disclosed herein and includes a gated switching device connected across an AC voltage supply, and a charging capacitor also connected with the supply voltage and adapted to di... | 12/16/1980 |
| 4234966 | Double balanced diode mixer with d.c. response A direct current responsive mixing circuit (10) includes three mixers (14, 16 & 18), each having one D.C. port and two A.C. ports. The D.C. ports are responsive to D.C. and A.C. signals, while the A.C. ports are responsive only to A.C. signals. One mixer ... | 11/18/1980 |
| 4194202 | Grid pulsed oscillator and detector 5. A pulse doppler proximity fuze comprising a self-pulsing oscillator for eveloping a series of radio frequency electromagnetic energy impulses, an antenna electrically connected to said oscillator for radiating said impulses into space and for intercepti... | 03/18/1980 |
| 4194160 | Noninteractive heater power supply A high efficiency regulated heater power supply which avoids the interactive effects of varying magnetic field around the heater on tube operating parameters. The technique employed is to "chop" the low frequency (typically, 60 Hz) supply at a high freque... | 03/18/1980 |
| 4177413 | Battery chargers A charging circuit for charging a low voltage battery from an AC supply, said circuit comprising a full wave bridge rectifier, each leg of the bridge including a rectifying element, and means for providing a visual indication of normal operation of said c... | 12/04/1979 |
| 4156276 | Effective value converting circuit An effective-value converting circuit comprising a rectifier circuit of which four arms are composed of diodes to rectify an a-c input, a temperature compensating diode connected between the output terminals of the rectifier circuit in series with a plura... | 05/22/1979 |
| 4097769 | Circuit for controllably providing power from an AC source to a load A transformerless triac control circuit provides direct on/off control of loads including loads requiring a high current. An on/off decision is made twice each period of the source voltage, and the on/off decision results from the happening or the nonhapp... | 06/27/1978 |
| 4074202 | Biasing circuit for thyratron A thyratron is provided with at least one pair of adjacent electrodes separating two voltage withstanding gaps. In order to reduce the likelihood of voltage breakdown occurring across one of the gaps that electrode of a pair of adjacent electrodes which i... | 02/14/1978 |
| 4027325 | Integrated full wave diode bridge rectifier A full wave rectifying junction-diode bridge rectifier is formed in an integrated silicon circuit. One of the two bridge output terminals is ohmically connected to the bulk doped silicon body so that this portion of the body may serve as the ground refere... | 05/31/1977 |
| 4010535 | Method of fabricating a voltage multiplier circuit assembly A voltage multiplier circuit assembly circuit is fabricated by the use of an apparatus which comprises a pair of guide walls juxtaposed on a horizontal insulative support, each of the guide walls having first and second slits in opposed relation to the co... | 03/08/1977 |
| 3997890 | Alarm system with supervisory system to detect severing or bridging of detection switches A tamper proof detector circuit for use in an alarm system and an integral switch for use therein. The integral switch is comprised of a housing which encloses an alarm condition sensing switching means connected to a diode. The integral switches are conn... | 12/14/1976 |
