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WO/2001/024191A1 |
A programmable reference voltage controls a high-voltage source via a programmable voltage divider. The programmable voltage divider scales a fixed reference voltage to a scaled reference value that is used to control the generation of a...
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WO/2001/010007A1 |
The invention relates to an electric circuit (10), in particular for a medium voltage power converter. The circuit (10) has at least four semiconductor switches (15, 16, 17, 18) which form a series connection and which are connected to p...
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WO/2001/003299A1 |
A power amplifier is provided with a novel triangle wave generator (4) in which a more precise triangle wave is produced with the aid of logic circuits. The resulting generator (4) is able to operate at higher frequencies. A fast current...
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WO/2000/057551A1 |
The invention relates to a circuit arrangement for producing a voltage with a ramp-type time history between a first voltage value and a second voltage value according to the temporal modification of an input voltage. The circuit arrange...
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WO/2000/046924A1 |
In a driving circuit (2, 3) for a semiconductor switching element (1), a storage time (Ts) of the semiconductor switching element (1) is measured (2) to control the semiconductor switching element (1) such that the storage time (Ts) is k...
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WO/2000/038410A1 |
A scanning system for a film recorder utilizes multiple digital-to-analog converters (DACs) to produce a linear output for a vertical deflection circuit which drives a vertical yoke circuit for controlling a CRT beam in a film recorder. ...
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WO/2000/035090A1 |
The invention concerns a multilevel current generator with digital control comprising: a digital input (16) for receiving digital data corresponding to output current levels; at least two digital-to-analog converters (52a, 52b) for conve...
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WO/1999/065144A1 |
A method of control of the current and voltage switching trajectories of insulated gate power semiconductor switches, more specifically MOSFETs and insulated gate bipolar transistor devices (IGBTs), is disclosed. MOSFETs and IGBTs are us...
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WO/1999/053609A2 |
Relaxation oscillator comprising a chain of coupled sawtooth generator stages. Each stage has a capacitor which is charged and discharged. The charging of a capacitor begins when the voltage (C¿c1?) of a previous stage reaches a thresho...
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WO/1999/053616A1 |
A monopulse generator (34) as shown in Figure 3, comprising an oscillator (46) which operates to generate a repetitive waveform signal (47) having substantially the same repeated waveform pattern having a predetermined frequency, a divid...
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WO/1999/052212A1 |
The invention concerns a method for controlling power transistor switching by applying a control signal on the grid or each grid of the transistor, the control signal (V¿GS?) comprises a voltage stage (I) with a value intermediate betwe...
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WO/1998/026505A1 |
A fast voltage ramp generator comprises a chain of transistors connected collector to emitter in series, and biased to avalanched switching mode. A respective transformer secondary is connected to apply a switching pulse across the base ...
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WO/1998/000967A1 |
A line deflection circuit includes circuitry for protecting the line output transistor (Q1) from failure due to an over-current condition. The circuitry includes a current detector (R3) for detecting the current in the collector-emitter ...
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WO/1997/050175A1 |
A relaxation oscillator of reduced complexity is described which can be constructed as part of a silicon integrated circuit. The current controlled oscillator includes complementary field effect transistors operating in enchancement mode...
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WO/1997/050244A1 |
A focusing waveform (Vf) is obtained by first generating (2) two intersecting triangular waveforms of opposite phase and half the deflection frequency. Subsequently, the difference between these two triangular waveforms is multiplied by ...
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WO/1997/006598A1 |
An apparatus (90) for controlling an electrical appliance coupled with an output terminal and configured to operate in response to an alternating input signal, such as input AC power. The apparatus comprises a reference signal generator ...
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WO/1997/004525A2 |
A wireless digital communication device is proposed having a pulse shaping network for pulse shaping digital signals before modulation. The pulse shaping network comprises a shift register to which data to be modulated are fed. Outputs o...
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WO/1997/004526A1 |
The present invention, generally speaking, provides an improved base drive arrangement for scan and/for EHT output stages in a television or video display monitor. In accordance with one aspect of the invention, by adding just a few comp...
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WO/1997/001136A1 |
A digital oscillator including an oscillator (40), a counter (41), a memory (42), a digital-to-analog converter (43) and a low-pass filter (44) is disclosed. The memory is able to store a complex signal directly, such that a real-time co...
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WO/1996/034455A1 |
An asymmetrical ramp generator system (150) for a pulse width modulator includes a complementary clock circuit (152, 154); a first symmetrical dual ramp generator (156), responsive to the clock circuit, for generating first and second ra...
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WO/1996/034292A1 |
A calibration system for an asymmetrical ramp generator for a pulse width modulator includes a complementary clock circuit (152); a first symmetrical dual ramp generator (156) for generating first and second ramps; a comparator device (1...
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WO/1996/023357A1 |
The circuit of the invention makes it possible to switch in a defined manner the output switching stages (5) off in an actuator-sensor-interface system on the failure of data communication. This is attained by a timer (3) controlled by t...
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WO/1995/011550A1 |
A circuit (700) for an electric fence energiser (examples are 6 or 24 Joule versions) which synthesises a pulse having a raised cosine waveform at a first or bus voltage uses a ferrite-cored output transformer (701) to multiply the volta...
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WO/1993/024996A1 |
An automatic calibration (10) for a ramp voltage generator includes a ramp voltage generator circuit (12) responsive to a clock signal (18) for providing a ramp voltage (108) during a ramp voltage period; comparator means (110) responsiv...
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WO/1993/022833A1 |
An improved ramp generator system includes a plurality of ramp generator circuits; a ramp rate signal source (44) for controlling the ramp slope; a ramp voltage signal source (46) for establishing the starting voltage of the ramp; a ramp...
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WO/1993/005575A1 |
If a vertical deflection circuit with an IC of the TDA 8178FS or TDA 8179FS type is to be operated at an increased deflection frequency of 100 Hz and a reduced return time, the operating voltage must be increased, thus raising the power ...
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WO/1992/016050A1 |
A voltage-frequency converter contains a first integrating stage (1), second integrating stage (2), a threshold value device (3) and a pulse generator. The voltage to be converted (U�e?) is applied to the input of the second integratin...
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WO/1992/008945A1 |
In a preferred embodiment, an inductor (24) excited by a square-wave alternating current to produce a magnetic field in the inductor. A member (26) movable in proximity to the inductor (24) causes losses in the magnetic energy, which los...
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WO/1991/015057A1 |
Modern vertical deflectional connections are constructed with amplifiers in D mode in which a pulse width modulator activates the electronic switches with line frequency width-modulated pulses. The pulse width is controlled by an error a...
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WO/1991/006151A1 |
Oscillator circuit of the regenerative type, comprising a first oscillator at least including a first feedback amplifier (Qa1, Qb1) and a first integrator (C1) in which the first oscillator has an output signal having two stable levels a...
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WO/1991/005433A1 |
A saw-tooth wave signal is fed to a non-inverted input terminal of a first power amplifier that constitutes a first negative feedback amplifier. A deflection coil is connected at its one end to the output terminal of the first power ampl...
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WO/1990/011511A1 |
A method and apparatus for triggering and measuring electrochemiluminescent phenomena using a voltage waveform applied at the voltammetric working electrode which improves the precision and accuracy of measurements. This waveform has a d...
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WO/1990/006019A1 |
A triangle wave generator (10) which is programmable, and which provides variable amplitude, frequency independent, triangle waves over a wide frequency bandwidth while employing a low voltage power source. The triangle wave generator (1...
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WO/1990/005411A1 |
An apparatus and method for conducting measurements of electrochemiluminescent (ECL) phenomena includes a cell unit (14) having an electrode configuration for inducing the emission of ECL light by the application of a selected voltage wa...
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WO/1989/002191A1 |
An incremental time delay generator (18) may be disposed on a small substrate (11) and may be used in conjunction with a time domain reflectometer (12). The incremental time delay generator produces an output signal at a variable time de...
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WO/1988/004865A1 |
A monolithic integrated circuit generates a programmable time delay under control of a digital word. The delay is generated by comparing a ramp signal to a threshold determined by the value of the digital word and appears as a time diffe...
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WO1988004865A2 |
A temperature compensation circuit is disclosed which has a monolithic integrated circuit with at least one integrated resistor (R84) having a first temperature coefficient, and an integrated bias circuit containing a pair of cross-coupl...
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WO/1988/000411A1 |
Circuit as described, in which the current is obtained from a winding of the line output transformer, which winding is connected in series with a synchronized electronic switch, said circuit being provided with a series-connected integra...
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WO/1987/006070A1 |
A voltage generator (1) produces, without consuming power, an ideal network voltage (7), having an original amplitude, between the neutral conductor (N) and the control input of a transistorized symmetrical complementary circuit (2). The...
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WO/1986/004702A1 |
An electrical waveform generator and a method for electrical waveform generation are provided which includes a central processing unit (13) to first provide sequential points of a selectable waveform in digital form and store them in dig...
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WO/1985/005751A1 |
An apparatus for controlling the amplitude of a sawtooth television signal of a vertical cycle. The amplitude of a sawtooth wave is judged in a judgement circuit (7) to determine whether the amplitude is substantially at a level in a sui...
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WO/1984/004994A1 |
A high efficiency cathode-ray tube magnetic deflection circuit, providing a sawtooth current waveform at a frequency of 100 kilohertz that includes a FET transistor (11) connected to an anti-phased step-down transformer (15, 16, 17) for ...
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WO/1984/004857A1 |
A ringing signal generator in which a low-level reference ringing signal, generated by a reference waveform generator (101), is amplified by a delta-modulation power amplifier (106, 108). The low-level reference signal is digitally encod...
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WO/1983/000966A1 |
A relaxation oscillator (10) which is suited for fabrication as a monolithic circuit and which uses a parallel resistive capacitive frequency determining network (36, 38) wherein a capacitor is charged and discharged between an upper and...
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WO/1982/004168A1 |
A tone synthesizer circuit (10) includes a multi-tap resistor (86) which produces a plurality of discrete voltages at the taps (T1-T16). A switch (88-118) is provided for each of the taps (T1-T16). The tap switches (88-118) are organized...
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WO/1982/002807A1 |
The saw-tooth voltage generator is particularly intended for use as a reference and rate generator for the electric monitoring of the heating of motor vehicle. The generator has an output voltage which has an ascending edge determined by...
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WO/1982/002629A1 |
An integrated circuit current-output relaxation oscillator utilizes an internal or external capacitor (C) which is alternately charged from + VBE to a predetermined upper trip point and then discharged to + VBE. A control current (Icnt) ...
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WO/1982/002299A1 |
A horizontal oscillator for a television receiver includes an on chip nitride capacitor (30). The circuit includes a reference current amplifier (64, 66, 68, 70, 72) which generates a low temperature coeficient reference current. By vary...
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WO/1982/002298A1 |
A resistor-capacitor oscillator circuit (10) is provided and includes a voltage comparator circuit (12). A capacitor (20) is connected to an input terminal (14) of the voltage comparator circuit (12). A resistor divider network (30) is c...
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WO/1982/000536A1 |
A stage converter of electric signals comprises a circuit (1) with variable gain factor, the controlling inputs of which are connected to the outputs of a generator (3) of controlling signals to ensure variation of the gain factor of the...
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