Supertex, Inc. Patent applications |
Patent application number | Title | Published |
20150286230 | Current Control Circuit for Linear LED Driver - Employed within an LED driver operating from the AC power line, the invention controls both input current and output power. With this regulation circuit, input current appears purely resistive, precisely tracking the input voltage waveshape. At the same time, it provides good line regulation and inherent phase dimmer compatibility, requiring no special circuitry to detect and handle a dimmer. | 10-08-2015 |
20150091646 | CURRENT MODE CLASS AB LOW-NOISE AMPLIFIER AND METHOD OF ACTIVE CABLE TERMINATION - This invention relates to medical ultrasonic imaging systems and, in particular, phased array imaging systems operating in different scan formats and imaging modalities. More specifically, the invention relates to the front-end processing of ultrasonic echoes. | 04-02-2015 |
20150022176 | Power Converter with inductance invariance - An improved power converter is disclosed. | 01-22-2015 |
20150022105 | Method and Apparatus for Extending the Power Output Range of a Power Converter Used for a Lighting System - A method and system for extending the power output range of a power converter used for a lighting system is disclosed. | 01-22-2015 |
20140376285 | Auxiliary Power Supplies - The invention relates to auxiliary power supplies. | 12-25-2014 |
20140210363 | Multiple Stage Sequential Current Regulator - An LED driver circuit for controlling direct current supplied to a plurality of serially connected segments of Light Emitting Diodes (LEDs) is disclosed. In one embodiment, the LED driver circuit comprises a self-commutating circuit, which comprises a plurality of current control elements, each current control element having two ends, a first end connected to a different end of each segment along the plurality of serially connected segments of LEDs and a second end connected to a path to ground. The path to ground comprises a sense resistor and the path to ground is shared by the second end of each current control element. Each current control element is coupled to an adjacent current control element by a cross-regulation circuit and controlled by a signal from an adjacent current control element. | 07-31-2014 |
20140097897 | OP-AMP Sharing Technique to Remove Memory Effect in Pipelined Circuit - This document describes a new op-amp sharing technique for pipeline ADC without memory effect. The key features of this technique are: the usage of negative impedance converter and scaled replica of the op-amp input device to achieve zero error voltage, which in turns achieve low power dissipation due to the removal of the tradeoff between op-amp sharing and memory effect. With this technique much lower operation of pipeline ADC can be achieved for applications of data communications and image signal processing. | 04-10-2014 |
20140035646 | Phase Shift Generating Circuit - A phase shift generation circuit has an edge detector for generating first and second edge signals indicating first and second edges of an input pulse signal. The circuit comprises a divide by N circuit that divides the frequency of a first clock signal by N. The circuit comprises a pulse counter, which receives the first edge signal and the second clock signal, and outputs a group of signals representing the number of the second clock pulses between occurrences of the first edge signal. The circuit has a first recycling timer that outputs a group of pulses as a uniformly spaced group across the period of the input pulse. The circuit also has a second recycling timer that outputs a group of pulses as a uniformly spaced group across the period of the input pulse. The first and second recycling timers are used to generate a phase shifted output pulse. | 02-06-2014 |
20130187551 | Method and System for Driving LEDs from a Source of Rectified AC Voltage - The present inventions relate to a control circuit for controlling a plurality of serially connected groups of LEDs. A control unit is connected in parallel to each group of a plurality of serially connected groups of LEDs. Each LED group is connected to the adjacent group of LEDs. The control unit is connected to a group of LEDs. The control unit performs the functions of voltage regulating/current regulating/bypass for the associated group of LEDs. The control unit can act as a by-pass unit permitting current to flow through the control unit rather than through the associated group of LEDs. | 07-25-2013 |
20130154715 | Bootstrapped Switch with a Highly Linearized Resistance - Systems and methods are disclosed for operating a highly linearized resistance for a switch through use of a bootstrapped features. In one exemplary implementation, there is provided a method and system that implements a method for operating a circuit configured to provide a highly linearized resistance including receiving a signal via a bootstrapped switch, coupling the received signal to a gate if the received signal is high, receiving a signal via a switch control input coupled to a high impedance element. Moreover, the method includes coupling the high impedance element to the gate and turning off the switch via a gate turn off when the gate turn off pulls the gate low. | 06-20-2013 |
20120313485 | Impedance Matched Transmission Circuit with Analog-to-Digital Converter - An impedance matching transmission circuit for a transducer has a transmission medium connected to the transducer. A transmitting circuit is connected to the transmission medium with the transmitting circuit terminating in a reference circuit element. The transmitting circuit comprises an analog to digital converter having an analog input connected to the reference circuit element, and having a digital output. A digital to analog converter receives the digital output and generates an analog output signal in response thereto. A driver circuit is connected to the transmission medium and receives the analog output signal and supplies a driver signal to the transmission medium. | 12-13-2012 |
20120262075 | MULTIPLE STAGE SEQUENTIAL CURRENT REGULATOR - An LED driver circuit operating from the AC power line providing high efficiency, good line and load regulation, high power factor, low line current harmonics, low conducted EMI, high LED utilization, and lamp dimming compatibility, while consisting of a minimal number of components. No inductors, nor capacitors (including electrolytics), nor high current switching transistors are employed. The top of a string of series connected LED segments is connected to the output of a rectifier, which in turn is connected to an AC sine wave power source. The string is tapped at various locations, including the bottom of the string. Each segment can consists of any number of serial or parallel connected LEDs. Current control elements or regulators sink current at each tap and are sequentially turned on and off one at a time, tracking the rectified sine wave voltage. Voltage across each regulator and current when conducting is individually controllable. Power loss in the regulators is minimized by keeping regulator voltage to a minimum. The regulators may control current in a multitude of ways, including a constant current, or a current dependent on voltage across the regulators including a resistor, or a combination. The driver is self-commutating, with the sequencing of the current control elements an inherent feature closely integrated with the current control elements and providing optimal performance over variable operating conditions. Given the large number of design variables, the driver circuit can be optimized for various performance criteria including input voltage range, line/load regulation, output power/current, efficiency, power factor, line current harmonics, dimmer compatibility, and LED utilization. | 10-18-2012 |
20110133841 | Low Noise Binary-Coded Gain Amplifier And Method For Time-Gain Compensation In Medical Ultrasound Imaging - A low noise variable gain amplifier and method for processing received signals in an ultrasound medical imaging system is disclosed. Unlike solutions known from the prior art, the signals are amplified by a binary-coded gain amplifier having its amplification factor progressively increased during the penetration of the transmitted pulse into a patient's body. This allows enhancing both the system dynamic range and Signal to Noise Ratio. | 06-09-2011 |
20100231279 | Phase Shift Generating Circuit - A phase shift generation circuit has an edge detector, which receives an input pulse signal and outputs a first and a second edge signal denoting the time of occurrence of the first and second edges of the input pulse signal. The circuit also has a divide by N circuit, which receives a first clock signal and a group of signals representing a number N, and outputs a second clock signal, said a second clock signal having a frequency equal to the frequency of said first clock signal divided by the number N. The circuit further comprises a pulse counter, which receives the first edge signal and the second clock signal, and outputs a group of signals representing the number of the second clock pulses between occurrences of the first edge signal. The circuit has a first recycling timer, which receives the number of second clock pulses, the first edge signal and the first clock signal, and outputs a group of pulses approximating a uniformly spaced group across the time duration of the period of the input pulse. The group is spaced by the number of second clock pulses. The circuit also has a second recycling timer, which receives the number of second clock pulses, the second edge signal and the first clock signal, and outputs a group of pulses approximating a uniformly spaced group across the time duration of the period of the input pulse. The group is spaced by the number of second clock pulses. The circuit also comprises at least one flip flop with set and reset inputs. The set input receives a pulse from the second recycling timer, while the reset input receives a corresponding pulse from the first recycling timer. The flip flop generates a phase shifted output pulse. | 09-16-2010 |
20100123520 | Low Noise Binary-Coded Gain Amplifier and Method for Time-Gain Compensation in Medical Ultrasound Imaging - A low noise variable gain amplifier and method for processing received signals in an ultrasound medical imaging system is disclosed. Unlike solutions known from the prior art, the signals are amplified by a binary-coded gain amplifier having its amplification factor progressively increased during the penetration of the transmitted pulse into a patient's body. This allows enhancing both the system dynamic range and Signal to Noise Ratio. | 05-20-2010 |
20090153208 | Pulse Width Modulation Driver for Electroactive Lens - An electroactive lens driver generates a variable root-mean-square drive voltage for controlling an electroactive lens by controlling the duty cycle of a modified square wave. | 06-18-2009 |
20090110384 | Inductorless Electroactive Lens Driver and System - An electroactive lens driver comprises a voltage generator generating a high alternating current voltage signal for application to an electroactive lens in response to a low direct current voltage signal. The voltage generator does not include an inductor or a transformer. | 04-30-2009 |
20080242987 | Method and Apparatus for Transducer Excitation in Medical Ultrasound Imaging - A method of transducer excitation in medical ultrasound imaging. Based on a stepped approximation of Gaussian modulated cosines, the transmit waveform provides bandlimited spectrum and low level of second order harmonics while retaining the duration of the transmitting within two carrier cycles. The waveform is constructed as a linear composition of four unipolar, rectangle pulses of unity amplitude. Furthermore, the described embodiment supports digitally controlled transmit apodization and focusing. | 10-02-2008 |