258 results about "Triangle wave" patented technology

The present invention is related to a method for treating or irradiating a target volume with a particle beam produced by an accelerator, comprising the steps of: deflecting said particle beam with the help of scanning means in two orthogonal (X, Y) directions, thereby constituting an irradiation plane perpendicular to the direction (Z) of the beam, defining in the irradiation plane a scanning field which circumscribes the area of intersection of target volume and irradiation plane and scanning said scanning field by drawing scan lines which form a scan pattern comprising interleaved frames of triangle waves. The scan pattern is preferably continuous and represents contiguous rhombi figures. The invention is equally related to a device and a software program or sequencer implementing the method.

A superconducting quantum interference devices (SQUID) comprises a superconducting inductive loop with at least two Josephson junction, whereby a magnetic flux coupled into the inductive loop produces a modulated response up through radio frequencies. Series and parallel arrays of SQUIDs can increase the dynamic range, output, and linearity, while maintaining bandwidth. Several approaches to achieving a linear triangle-wave transfer function are presented, including harmonic superposition of SQUID cells, differential serial arrays with magnetic frustration, and a novel bi-SQUID cell comprised of a nonlinear Josephson inductance shunting the linear coupling inductance. Total harmonic distortion of less than −120 dB can be achieved in optimum cases.

Disclosed herein are a single-stage backlight inverter and a method for driving the same. The single-stage backlight inverter comprises a main oscillator for generating a predetermined triangle-wave oscillation signal, a predetermined clock signal and an inverted clock signal, and an output drive controller responsive to the triangle-wave oscillation signal, clock signal and inverted clock signal from the main oscillator and first and second reference voltages set therein. The second reference voltage has a level set to an intermediate level of the triangle-wave oscillation signal. The output drive controller is adapted to generate a first drive control signal and generate a second drive control signal. The inverter further comprises a first output unit for outputting a pair of first switching signals in response to the first drive control signal, and a second output unit for outputting a pair of second switching signals in response to the second drive control signal.

Abstract of Disclosure An improved class BD (3-state) switching amplifier is provided requiring fewer power switching devices, and providing improved immunity to power-supply-induced distortion and greatly reduced notch distortion. Asymmetric gate drive delay circuitry produces time-coincident very short positive and negative drive pulses for very small signals, enabling linear performance down to zero input. The reference triangle wave is generated such that the positive amplitude of the triangle wave is modulated by the positive supply and the negative amplitude is modulated by the negative supply, eliminating to first order any supply-induced output distortion.

The invention discloses a sound and ultrasonic nondestructive detection method, In the method, the nondestructive detection is carried out on the performance (such as adhesion) of materials such as composites by sound and ultrasonic sensors (such as an electroacoustic transducer made of piezoelectric material, magnetostrictive material, and the like) in a way of direct contact coupling or coupling by a couplant, the single and dual electroacoustic transducers can be excited in the form of continuous waves such as variable sine, pulse or triangle wave, a Phase Sensitive Detection (DSD) technique is adopts to process the change of amplitude and phase of feedback echo, and the detection effect of removing certain interference signals (namely retaining the truth and clearing up the false) can be achieved especially by frequency mixing processing of signals which are collected by different frequencies. The application mechanism of the method adopts currently advanced multifrequency and frequency spectrum analysis technique used for eddy detection to process the information obtained by the electroacoustic transducer, thus obtaining all detection characteristics which the existing noise and vibration detecting does not have.

The present invention relates to an oscillator outputting two triangle waves having the same amplitude and whose phases are inverted; and a pulse width modulator using the oscillator. A capacitor 3 is charged or discharged by a charge pump circuit 2 controlled by a Schmitt circuit 1 , and a voltage integrated by a two-output differential amplification circuit 6 is positively fed back to the input of the Schmitt circuit 1 to output two triangle waves having the same amplitude and whose phases are inverted. Since the output stage is composed of a differential amplification circuit, the circuit has low output impedance and is protected from wiring capacity and connected input capacity, and since integral operation is caused to be performed by the differential amplification circuit, the distortion in the waveform of the triangle waves can be prevented.

A primary side is provided with an oscillation circuit arranged to turn on a power switch at a constant cycle. The secondary side is provided with an on period control circuit arranged to output an off signal for turning the power switch off by detecting output voltage and comparing with a reference triangle wave signal. An isolated signal transfer circuit is provided between the primary side and secondary side to transfer an on signal. The primary side is provided with a power switch off circuit arranged to turn off the power switch based on the on signal.

A chip seal ring that maintains the chip seal ring as a continuous barrier to contamination, while at the same time creating a desirable electrical feature in the seal ring that enables the use of an on-chip loop antenna. In one embodiment, at least a portion of the chip seal ring has a serpentine configuration, such as a square wave, triangle wave, or curved geometry, that increases the reactance and resistance of the seal ring so as to mitigate the adverse induced currents created by the magnetic coupling effects between the on-chip antenna and the seal rings, thereby improving the efficiency of an on-chip loop antenna in the presence of the seal ring.

Apparatus for marking a bitmap image on tape includes a scanning mirror which is incorporated in a micro-electro-mechanical system (MEMS). The MEMS is torsionally resonant at two frequencies one being about three time the other. The MEMS is excited to resonance by applying an AC signal to the actuators, causing the mirror to oscillate. The AC signal has components at the two frequencies. The magnitude and phase-relationship of the components can be selected such that the mirror oscillates in an approximation of a triangle-wave.

The invention is suitable for the field of integrated circuit and provides a triangular wave generating circuit, a pulse-width modulation circuit and an audio power amplification circuit. The triangular wave generating circuit comprises a reference voltage generating circuit which generates a reference current and a reference voltage which are adapted to the change with a power supply voltage according to the power supply voltage, and an oscillating circuit which generates a triangular wave output according to the reference voltage and the reference, wherein the amplitude of the triangular wave is adapted to the change of the power supply voltage. In the invention, the reference voltage which can be adapted to the change along with the power supply voltage is generated by the reference voltage generating circuit so as to enable the amplitude of the triangular wave output by the oscillating circuit to be adapted to the change along with the power supply voltage. Meanwhile, the self-adapted reference current generated by the referential voltage generating circuit can ensure the stable frequency of the triangular wave output by the oscillating circuit.

The invention discloses a triangular wave linear frequency-modulated continuous wave radar-based high-speed target speed measuring and ranging method. The method comprises the following steps of collecting target echo data measured by a triangular wave linear frequency-modulated continuous wave radar, performing FFT (fast Fourier transform) treatment to obtain an up-and-down frequency sweeping result, substituting a frequency difference generated by the distance walking into a calculation formula of the distance and the speed to obtain a corrected distance and speed equation, and further solving to obtain a distance and speed result. According to the invention, the speed measuring and ranging formula of the triangular wave linear frequency-modulated continuous wave radar is corrected, so that a more accurate result can be obtained during the detection of a high-speed moving target.

A control circuit of a multi-mode buck-boost switching regulator and a method thereof are provided. The control circuit imposes ON / OFF timing sequences on switches according to the relationship between two controlling triangle waves and the load fluctuation. In each working cycle of each mode of the regulator, at most two switches perform switching operations. The control circuit is simple to design, which only includes simple digital elements, such as comparators, logic gates etc., instead of complicated analog circuits.

The present invention relates to a PWM isolation dimming circuit and an LED dimming driving power source, wherein the PWM isolation dimming circuit comprises: a square-wave generator circuit, used to generate a square-wave signal by oscillation; an integrating circuit, wherein an input end thereof is connected to an output end of the square-wave generator circuit, and the integrating circuit is used to perform an integral operation on the square-wave signal, to generate a triangle-wave signal; a PWM generator circuit, wherein an input end thereof is connected to an input end of a dimming signal and an output end of the integrating circuit, and the PWM generator circuit is used to compare the dimming signal with the triangle-wave signal, generate a PWM signal according to a comparison result, adjust a duty ratio of the PWM signal and output an adjusted PWM signal; and a photocoupling circuit, wherein an input end thereof is connected to an output end of the PWM generator circuit, and an output end thereof is connected to a control end of an LED driving power source, to control an output current of the driving power source. The foregoing PWM isolation dimming circuit and LED dimming driving power source have advantages of being good in degree of linearity, small in circuit volume, and low in costs because a high-frequency transformer is unnecessary.