44results about How to "Suppress harmonic interference" patented technology

An antenna system includes an antenna, a first frequency dividing circuit, a second frequency dividing circuit, and a plurality of matching circuits. The first frequency dividing circuit is coupled to the antenna. The matching circuits are coupled to the first frequency dividing circuit. The second frequency dividing circuit is coupled to the matching circuits. The matching circuits are configured to process different frequency signals, respectively.

The embodiment of the invention provides a PWM (Pulse-Width Modulation) rectifier controlling method and a PWM rectifier. The PWM rectifier controlling method is a passivity control method based on repeated control and compensation, and comprises the following steps: a control law of the PWM rectifier based on the interconnection and damping configuration of port controlled dissipation Hamilton models is obtained with a Lagrange-Charpy integral method; and a composite controller including repeated control and passive control is used as a controller of the PWM rectifier, and the passive control is compensated by the repeated control according to the control law so as to suppress periodic interference. According to the embodiment of the invention, PWM rectification of a unit power factor can be realized, and at the same time the harmonic interference of a power grid is better suppressed under the condition of not detecting load harmonic current so as to improve power quality. Compared with the conventional PWM rectifier, the PWM rectifier disclosed by the invention has the functions of harmonic suppression and reactive compensation under the condition of not increasing hardware cost.

The invention is directed to a communication device and an electronic device. The communication device includes an antenna, a frequency dividing circuit, and at least one variable impedance circuit. The frequency dividing circuit has a common port coupled to the antenna and at least one output port. The frequency dividing circuit is configured to divide a frequency range received from the common port into a plurality of frequency sub-ranges and output at least one of the frequency sub-ranges respectively at the at least one output port. Each variable impedance circuit is coupled between a corresponding one of the at least one output port of the frequency dividing circuit and a respective first reference voltage. Each variable impedance circuit provides a respective variable impedance value switched between different respective impedance values. The communication device is advantageous in that harmonic interference in the communication device can be effectively eliminated.

A multiple-input multiple-output antenna transceiver circuit includes a radio frequency transceiver and multiple transceiver units, each transceiver unit includes an antenna, a power amplifier, a low-noise amplifier, a first switch unit and a second switch unit. The power amplifier is used to amplify the power of the signal to be transmitted output by the radio frequency transceiver so as to transmit it through the antenna. The low noise amplifier is used to amplify the RF signal received by the antenna and transmit it to the RF transceiver. The first switch unit and the second switch unit are used to select and switch the transceiving path according to the transceiving state of the radio frequency transceiver. The above-mentioned multi-input multi-output antenna transceiver circuit switches the sending and receiving path by adding a switch unit, realizes the isolation of the transmitting path and the receiving path, effectively suppresses the harmonic interference generated between the transmitting path and the receiving path, and improves the performance of adjacent antennas at the same time. isolation between.

This embodiment provides a signal processing method and a related device. By separating the frequency points of the input signal, several single-frequency point signals are obtained, so that the center of a target single-frequency point signal among the several single-frequency point signals The first signal of the frequency generates a control signal, triggers the frequency point channel corresponding to the target single frequency point signal to output the target single frequency point signal, and then selects the target single frequency point signal from several single frequency point signals , so that the target single frequency point signal is isolated from other single frequency point signals that interfere with the target single frequency point signal, and then the target single frequency point signal is eliminated before processing the target single frequency point signal. The interaction of interference signals suppresses the interference of interference signals on the target single-frequency point signal, solves the problem that the signal anti-interference processing effect is limited by the interference environment simply and at low cost, and further improves the anti-interference performance.

The invention provides a digital interference elimination and avoiding method in a steel passing data and energy simultaneous transmission system and an apparatus thereof. Data signal transmission accuracy can be increased. The interference elimination method comprises the following steps of at a receiving end of a data transmission link, acquiring a data signal; adjusting a weight coefficient of an adaptive filter so that an interference signal output by the adaptive filter tends to an interference signal in the data signal; and through subtracting the interference signal output by the adaptive filter from the data signal, acquiring an OFDM signal after the interference is eliminated. The interference avoiding method comprises the following steps of when symbol modulation is performed on a data transmission link sending end, inserting 0 in front of a data signal transmitted by an interfered subchannel so that the data signal is transmitted through a next normal subchannel; and before the symbol modulation is performed on the data transmission link receiving end, multiplying the data signal before the demodulation by an avoided vector, wherein the symbol modulation is not performed on the transmission data of the interfered subchannel. The method and the apparatus are suitable for the ultrasonic wave communication technology field.

The invention relates to a power supply device with extremely low harmonic interference. The device is characterized in that: a filtering layer (1) which consists of four layers of integrally copper-laid printed circuit boards (PCB) is arranged on a metal tube shell (8); the bottom of the filtering layer (1) is provided with input and output electro-magnetic interference (EMI) filtering circuits (1b); the middle of the metal tube shell is provided with a shield layer (7) which consists of four layers of integrally copper-laid PCBs; a main control layer (9) is arranged below the metal tube shell and is provided with a pulse-width modulation (PWM) control circuit, a power switch tube alternating current loop, an output rectifier alternating current loop and the like; feedthru capacitors (3) are connected to the filtering layer and the main control layer; ground wires of the feedthru capacitors (3) are connected to the metal tube shell; and input and output leads enter or leave the metal tube shell through the feedthru capacitors. The device has the advantages that: outward electromagnetic radiation of a power supply module is reduced greatly and high anti-jamming capability is realized; output harmonic waves are extremely low and are about one fifth that of the same type of general direct current to direct current (DC / DC) power supply module; a harmonic interference signal in a full bandwidth range is lower than 20 mV; and the power supply device can be well applied to anti-electromagnetic environment equipment with high requirement on harmonic waves.

The invention provides a communication device and an electronic device. Wherein, the communication device includes: an antenna, a frequency division circuit and at least one variable impedance circuit. Wherein, the frequency division circuit has a common port, the common port is coupled to the antenna and at least one output port, and the frequency division circuit is used to divide the frequency range received from the common port into multiple frequency sub-ranges and divide the multiple frequency sub-ranges into At least one of the frequency sub-ranges is respectively output to the at least one output port; and each of the at least one variable impedance circuit is coupled to a corresponding output port and a first output port of the at least one output port of the frequency division circuit. A reference voltage, and each variable impedance circuit respectively provides a variable impedance value switched between different impedance values. The communication device provided by the invention can effectively suppress harmonic interference in the communication device.