13results about "Duration/width modulated pulse demodulation" patented technology

In some aspects, a device may comprise a digital modulator to generate a first pulse width modulation (PWM) signal. The device may comprise a first power stage component to generate a first output PWM signal based on the first PWM signal. The device may comprise a first sampling component to sample the first output PWM signal and generate a first sampled output PWM signal. The device may comprise a first adjustment signal generator to generate a first duty cycle adjustment signal based on the first PWM signal and the first sampled output PWM signal. The device may comprise a first PWM adjustment component to adjust a duty cycle of the first PWM signal based on the first duty cycle adjustment signal in association with correcting a duty cycle of the first output PWM signal to generate a corrected first PWM signal. Numerous other aspects are described.

Provided is a vacuum cleaner, including a main body including a power supply part configured to supply power, a first motor configured to generate suction force, and a first printed circuit board (PCB) on which the first controller is mounted, and a nozzle including a cleaning part, a second motor configured to drive the cleaning part and a second PCB equipped with a second controller, the nozzle configured to suck air containing foreign substances by the suction force, wherein a first power line communication from the first controller to the second controller is voltage pulse width modulation (PWM), and a second power line communication from the second controller to the first controller is a current shaping method.

Provided is a method to detect a target using a metal detector. The method includes transmitting a repeating sequence of transmitted magnetic field into an environment. The repeating sequence of transmitted magnetic field is generated by a repeating sequence of transmitted electrical current flowing through a transmit inductive winding such that the repeating sequence of transmitted electrical current includes at least a first period of rapid change of current, followed by a first period of non-zero approximately constant current. A transition time between the first period of rapid change of current and the first period of non-zero approximately constant current is controlled by a first value of an electrical current flowing through the transmit inductive winding during the first period of rapid change of current. The first value is determined by an output of a first negative feedback loop that measures at least part of the repeating sequence of transmitted electrical current flowing through the transmit inductive winding.

The present invention provides a pulse power supply device equipped with an arbitrary waveform voltage generation unit that can obtain a negative voltage gradient without using a current source. [Solution] The pulse power supply device of the present invention generates pulses of arbitrary waveforms having multiple predetermined voltage gradients by superimposing a constant voltage DC voltage and a piecewise linear waveform voltage. The piecewise linear waveform voltage has multiple linear waveform voltages that change over time at multiple predetermined voltage change rates dV / dt from the ground potential, and these linear waveform voltages are linked together. The pulse power supply device generates this piecewise linear waveform voltage by inverter control, generates an arbitrary waveform voltage by superimposing a DC voltage and the piecewise linear waveform voltage, and generates a pulse waveform from the arbitrary waveform voltage, thereby generating pulses with arbitrary voltage gradients without using a current source.

This pulse power supply device generates a pulse of a discretionary waveform having a plurality of prescribed voltage gradients by superimposing a constant voltage DC-voltage and a broken-line waveform voltage. The broken-line waveform voltage includes a broken-line waveform voltage in which a plurality of linear waveform voltages are connected, such voltages changing over time from a ground potential according to a plurality of prescribed voltage change rates dV / dt. The pulse power supply device: generates the broken-line waveform voltage by inverter control; generates the discretionary waveform voltage by superimposing the DC voltage and the broken-line waveform voltage; and generates a pulse waveform from the discretionary waveform voltage, and thereby generates, without using a current source, a pulse having a discretionary voltage gradient.

This invention belongs to the field of analog integrated circuit technology, specifically relating to an edge modulation and demodulation circuit for optically isolated transmission. It includes an SOI substrate, a waveguide layer, and a cladding layer. The SOI substrate comprises a substrate layer and a buried oxide layer. The waveguide layer comprises a lower silicon waveguide, a middle silicon dioxide spacer layer, and an upper silicon nitride waveguide. The upper silicon nitride waveguide modulates the width of the etched regions and the grating duty cycle on both sides of the central silicon nitride waveguide according to the near-field uniform emission principle, forming a fishbone-like grating antenna structure. The proposed double-layer grating structure utilizes the strong optical confinement of silicon waveguides and the weak perturbation characteristics of silicon nitride waveguides through full etching, reducing etching difficulty, effectively extending the effective length of the grating, thereby reducing the far-field emission angle of the beam, and exhibiting high wavelength tuning efficiency and high upward diffraction efficiency. The structure is simple and relatively easy to fabricate.

A circuit (20A) for decoding a pulse width modulated signal (PWM) comprises an input node (200) configured to receive the pulse width modulated signal (PWM), and an output node (202) configured to provide an output signal (DATA) switching between a first output value and a second output value as a function of the duty-cycle of the input pulse width modulated signal (PWM). A current generating circuitry (22) is coupled between a supply voltage node (Vdd) and a ground voltage node (GND) . The current generating circuitry is coupled to the input node (200) to receive the input pulse width modulated signal (PWM) and is coupled to an intermediate node (204) of the circuit to inject a current (IH) therein or to sink a current (IL) therefrom as a function of the value of the input pulse width modulated signal (PWM). A capacitance (C) has a first terminal coupled to the intermediate node (204), and it is alternatively charged and discharged by the currents (IH, IL) generated by the current generating circuitry (22). A comparator circuit (24) is coupled between the intermediate node (204) and the output node (202). The comparator circuit (24) is configured to sense a voltage signal (Vc) at the intermediate node (204), compare the sensed voltage signal (Vc) to a reference voltage signal (Vref), and drive the output node (202) to the first output value or to the second output value as a function of the comparison, thereby generating the output signal (DATA).

Provided in the present invention are a PWM signal conversion circuit and method, and an LED dimming system. The PWM signal conversion circuit comprises: a PWM signal detection module (11), which outputs a first voltage corresponding to a low-level time of a PWM signal, and a second voltage corresponding to a high-level time of the PWM signal; an addition module (12), which sums the first voltage and the second voltage to obtain a third voltage; a switch signal generation module (13), which generates a switch signal on the basis of the third voltage; a duty ratio value generation module (14), which obtains a duty ratio value on the basis of a high-level count of the switch signal for the PWM signal; and an output voltage generation module (15), which obtains, on the basis of the duty ratio value, an output voltage related to the duty ratio of the PWM signal. In the present invention, there is no need to use a large capacitor, and a peripheral circuit of a chip is simple; only one PWM signal cycle is required for extracting the duty ratio of a PWM signal, thereby achieving rapidness and high efficiency; and the frequency of performing duty ratio counting on the PWM signal is a fixed multiple of the frequency of the PWM signal itself; therefore, the duty ratio count is always constant regardless of how the frequency of the PWM signal changes, and thus the accuracy is high.

An isolation driver circuit for a pulse width modulation signal. The isolation driver circuit includes a rising edge detection circuit, a falling edge detection circuit, and a decoder. The rising edge detection circuit and the falling edge detection circuit respectively detect rising edges and falling edges of the input pulse width modulation signal, and respectively output corresponding rising edge detection signals and falling edge detection signals that are capacitively isolated from the input pulse width modulation signal. The decoder receives the rising edge detection signals and the falling edge detection signals, and outputs respective rising edges and falling edges of an output pulse width modulation signal that temporally align with the respective rising edges and falling edges of the input pulse width modulation signal. Thus, information stored in the pulse widths of the input pulse width modulation signal are preserved with high fidelity in the output pulse width modulation signal.

Provided is a vacuum cleaner, including a main body including a power supply part configured to supply power, a first motor configured to generate suction force, and a first printed circuit board (PCB) on which the first controller is mounted, and a nozzle including a cleaning part, a second motor configured to drive the cleaning part and a second PCB equipped with a second controller, the nozzle configured to suck air containing foreign substances by the suction force, wherein a first power line communication from the first controller to the second controller is voltage pulse width modulation (PWM), and a second power line communication from the second controller to the first controller is a current shaping method.

Provided is a vacuum cleaner, including a main body including a power supply part configured to supply power, a first motor configured to generate suction force, and a first printed circuit board (PCB) on which the first controller is mounted, and a nozzle including a cleaning part, a second motor configured to drive the cleaning part and a second PCB equipped with a second controller, the nozzle configured to suck air containing foreign substances by the suction force, wherein a first power line communication from the first controller to the second controller is voltage pulse width modulation (PWM), and a second power line communication from the second controller to the first controller is a current shaping method.

A PWM signal conversion circuit and method, and an LED dimming system. The circuit includes: a PWM signal detection module, which outputs a first voltage corresponding to a low-level time of the PWM signal and a second voltage corresponding to a high-level time of the PWM signal; an addition module, which sums the first and second voltages to obtain a third voltage; a switch signal generation module, which generates a switch signal based on the third voltage; a duty cycle ratio generation module, which obtains a duty cycle ratio of the PWM signal based on a counting to the high level of the PWM signal by the switch signal; and an output voltage generation module, which obtains an output voltage related to a duty cycle of the PWM signal based on the duty cycle ratio.