258 results about "Triangle wave" patented technology

A DTMF signal generating circuit is provided with a frequency designating unit which designates frequencies to form a DTMF signal, a sinusoidal wave computing unit which computes sinusoidal waves by referring to frequencies designated by the frequency designating unit, and a sinusoidal wave synthesizing unit which synthesizes two sinusoidal waves computed by the sinusoidal wave computing unit. The sinusoidal wave computing unit is provided with operators such as an adder-subtracter and a multiplier and generates a sinusoidal wave by determining terms of a Taylor expansion of a sinusoidal function by arithmetic operation.

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.

In an active noise reduction apparatus with an adaptive notch filter used, a triangle wave as a reference signal input into a first coefficient updater and a second coefficient updater reduces the number of execution times of product-sum operations in a reference signal generator to reduce the operation load.

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.

A phase shifting circuit that may be used as part of a quadrature clock generator. The phase shifting circuit comprises a triangle wave generator coupled to receive an input reference signal. The triangle wave generator outputs a pair of complementary triangle wave signals in response to the input reference signal. A comparator having a pair of inputs is coupled to receive the pair of complementary triangle wave signals. The comparator outputs an output signal having a predetermined phase relationship with the input reference signal in response to a comparison between the pair of complementary triangle wave signals.

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 insulated 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.

The invention discloses a no-filter D-class audio amplifier based on the chaos frequency spreading modulating technology, mainly comprising a chaos frequency spreading triangle-wave generator, a comparator and a full-bridge output-stage circuit, wherein the chaos frequency spreading triangle-wave generator is used for generating chaos frequency spreading triangle-wave signals. When an audio signal is sent, the comparator is used for comparing voltage values of the audio signal and the chaos frequency spreading triangle-wave signal to output a square wave signal with changeable dutyfactor. After the power of the square signal is amplified by the full-bridge output-stage circuit, the square signal is outputted to a loudspeaker and recovered to the audio signal above the loudspeaker. The invention has the following advantages that the electromagnetic interference of the output signal of the D-class amplifier is effectively inhibited under the condition of no filter, the integration is easy, the chip area is saved, and the linearity of the chaos frequency spreading triangle wave used as the PWM carrier wave is not influenced by the modulation signal (chaos sequence) is guaranteed, thus, the distortion factor of the output audio signal is not influenced.

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.

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 invention relates to a control circuit and a control method of a switching buck-boost rectifier with a plurality of modes. Two triangle waves for controlling are used for matching the control circuit with variable load, and a guide circuit for each switch and timing relationship of stop control are designed. At most two switches act within each work period of each mode. The circuit is easy in design and only requires simple digital components such as a comparator and a logic valve rather than a complex analogy circuit.

A pulse width modulated (PWM) controller has an input terminal for receiving a pulsed input signal having a first duty cycle, a power supply terminal for receiving a power supply voltage. a minimum duty cycle reference voltage signal, and a control circuit for providing a pulse-width-modulated (PWM) output signal having a second duty cycle related to the first duty cycle of the pulsed input signal. The PWM output control signal having a minimum duty cycle that is adjustable in response to a change in the power supply voltage. In an embodiment, the second duty cycle and the first duty cycle are correlated in a substantially linear relationship. In an embodiment, the PWM control circuit also has a triangle wave generation circuit for generating a triangle wave signal configured to oscillate between an upper limit voltage and a lower limit voltage, which are adjustable in response to a change in the power supply voltage.

The embodiment of the invention discloses a spread-spectrum modulation circuit, a variable frequency triangle generator and a signal processing method. The spread-spectrum modulation circuit comprises the variable frequency triangle generator, a first comparator and a second comparator; the variable frequency triangle generator is respectively connected with the first comparator and the second comparator; the first comparator and the second comparator realize the spread-spectrum of the pulse width modulation (PWM) according to the input signal and the variable frequency triangle waves input by the variable frequency triangle generator. In the embodiment of the invention, the random signal is used to control the changes of the so as to generate a triangle wave circuit with changed frequency, the spread-spectrum modulation circuit is realized, the structure realization is simple, and the high-frequency distribution is similar to the distribution of white noise, thus effectively reducing the electromagnetic interference in the existing circuit.

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.

The invention discloses a frequency locking device based on tunable laser absorption spectrum, and a frequency locking method of the frequency locking device. The frequency locking device comprises a laser (1), an optical fiber (13), a collimation optical fiber (2), a scattered light collection lens (3), a photoelectric detector (4), a temperature and current control part (5) and a frequency stabilization part (16); particularly, the frequency stabilization part (16) comprises a lock phase amplification device (9), a data acquisition and analysis device (10), a simulation PID device (8), an operational amplifier (7), a addition device (15) and a signal generator (6) which are sequentially connected in series; according to the method, the laser is modulated by a triangle wave superposition sine wave, and the distance between two absorption peaks generated by the rising edge and the falling edge in the received scattered light signal containing gas absorption information is taken as variable value, so that a stable frequency feedback control signal is obtained, and the frequency is stabilized on the specific absorption peak. The device and the method are widely used for detecting the compositions and the contents of substances in the atmosphere by a laser spectrum technology.

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.

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.

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 is concerned with the controlling circuit and loading system that uses the controlling circuit, the controlling circuit consists of the adjustable triangle wave generator, the error signal generator, and the pulse wave signal generator. The adjustable triangle wave generator uses the reference voltage and the feedback voltage to be the amplitude modulation and the frequency operation, outputs different amplitude and frequency triangle wave by the continuity or section mode, the error signal generator does the error operation for the reference voltage and the feedback voltage and outputs the error signal, the pulse signal generator outputs the pulse wave signal that the controlling voltage source supplies the loading system voltage according to the error signal and the adjustable triangle wave.

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.

The invention discloses a method for optimizing the input current of a Vienna rectifier, belonging to the field of high power factor conversion devices. The method comprises the following steps of adopting a switching frequency optimization PWM method to establish three-phase reference voltage and generating basic modulation wave, calculating a voltage phase angle generated due to the existence of a filter and determining the scope of compensation, adding compensation voltage to the three-phase reference voltage, generating new modulation wave, allowing the new modulation wave and triangle wave double-carrier wave with same upper and lower amplitudes and phase to be in intersection, and finally obtaining PWM wave which controls the Vienna rectifier. According to the method, the current distortion caused by an LCL filter device can be reduced, thus the input current tracks input voltage, a power factor is improved, and the efficiency of the Vienna rectifier is improved.

A converter control circuit applicable to various topologies of converters each employing two switching devices is disclosed. The converter control circuit includes an oscillator for generating a pulse signal and triangle-wave signal of a certain frequency, a switching control signal output unit for outputting a switching control signal to control ON / OFF of a plurality of switching devices based on a duty ratio determined from a feedback signal which is applied to a feedback terminal, a mode select signal generator for generating a mode select signal for determination of a control mode of a converter in response to the feedback signal applied to the feedback terminal, and a mode selecting unit for selecting the control mode in response to the mode select signal.

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.