42results about How to "Avoid self-excitement" patented technology

A multi-band antenna adapted for used in a portable electronic device, includes: a first antenna including a first radiating element, a common grounding element, and a first connecting element connecting the first radiating element and the common grounding element; a second antenna, including a first radiating portion, the common grounding element, and a second connecting element connecting the radiating portion and the grounding element. Free end portions of the first radiating element and the first radiating portion do not align with each other in any direction.

The invention discloses a shared protection system and a method of an optical ring network path, which avoids a loop circuit self-excitation, concerning a system and a method which avoid the self-excitation in an annular network of optical transmission and designed for solving the problem that the prior self-excitation restraining method lowers the signal-to-noise ratio or the operation agility is not good. The system of the shared protection of the optical ring network path, which avoids the loop circuit self-excitation, adds a vibration damper to a protection trail and changes the protection trail by the damping estate and the through estate of the vibration damper, which stops the protection trail from being closed. The shared protection method of the optical ring network path, which avoids the loop circuit self-excitation, includes that: (1). an amplifier conducts the real-time detection of the line status information of the system and transmits the information to a switching control unit of automatic protection. (2). the switching control unit of automatic protection controls the vibration damper to be switched between the damping estate and the through estate according to the line status information. The invention is mainly used in the shared protection system of two-fiber bidirectional path to protect the switching and effectively avoid the loop circuit self-excitation.

The invention discloses a long term evolution-interference cancellation system (LTE-ICS) and method. The system comprises an analog-digital conversion (ADC) module, a first complex frequency mixing processing unit, a direct digital control (DDC) module, an interference cancellation system (ICS) echo self-cancellation module, a digital up conversion (DUC) module, a second complex frequency mixing processing unit and a digital-analog conversion (DAC) module, which are sequentially connected with one another; and the system is characterized in that the ICS echo self-cancellation module comprises a first accumulator unit, a gain control unit, a delay unit, an XCORR module, a least mean square (LMS) module and a second accumulator unit; the input end of the first accumulator unit is connected to the output end of the DDC module and the output end of the second accumulator unit, and the output end of the first accumulator unit is connected to the input end of the gain control unit; the output end of the gain control unit is connected with the input end of the XCORR module and the input end of the delay unit; and the output end of the delay unit is connected to the input end of the XCORR module and the input end of the LMS module, the output end of the XCORR module is connected to the input end of the LMS module, and the output end of the LMS module is connected to the input end of the second accumulator unit. The system and the method are used for the self cancellation of the interference of a LTE wireless co-channel repeater.

A MOPA laser system that includes a seed laser configured to output pulsed laser light, an amplifier configured to receive and amplify the pulsed laser light emitted by the seed laser; and a pump laser configured to deliver a pump laser beam to both the seed laser and the amplifier.

The invention discloses a system and method for iteratively cancelling interference based on cross correlation and least mean square (LMS). The system comprises an analog to digital conversion processing unit, a first complex/hybrid frequency processing unit, a digital down-conversion processing unit, an LMS processing unit, a digital up-conversion processing unit, a second complex/hybrid frequency processing unit and a digital to analog conversion processing unit. The system and the method have the following beneficial effects: in the LMS processing unit, the cross correlation technology is adopted to estimate echo delay and the LMS algorithm is adopted to estimate echo gain, thus cancelling the interference signals in the working bands, effectively solving several problems caused by feedback interference from service antennas to link antennas in repeaters, avoiding self excitation of the repeaters and deterioration of signal quality and reducing the installation requirements of wireless repeater engineering.

The invention relates to a planar four-channel power combining amplifier, belonging to the technical field of communication, which solves the problems of limited adjustable range of amplitude and phase of the existing power combining amplifier and poor combining efficiency. The planar four-channel power combining amplifier comprises a power distributing module, a phase adjusting module, a power amplifying module and a power combining module which are connected in turn. The power distribution module is used for performing power distribution processing on the input signal according to the presetpower distribution demand to obtain four-channel power distribution signal. A phase adjusting module performs phase adjusting processing on four signals after power distribution. The power amplifyingmodule performs power amplifying processing on four signals after phase adjusting, and a power combining module performs power combining processing on four signals after power amplifying, so as to obtain the final signal output satisfying the preset power demand. The invention has the advantages of simple structure, small volume, high system stability and high output power, and the output power can reach more than 10W.

The invention discloses an integrated intelligent light control lamp which is internally provided with a photoreceptor and capable of avoiding self-excitation and ensuring correct and automatic turning on and off operation. The integrated intelligent light control lamp comprises a control circuit, an LED light source, and the photoreceptor in the integrated intelligent light control lamp; the control circuit comprises a power supply circuit (1), a central controller (2), a central controller power supply circuit (3), a phase angle signal detection circuit (4), a photosensitive signal detection circuit (5), a turning on-off operation control circuit (6), and an LED light source control circuit (7); the phase angle signal detection circuit (4) feeds back phase angle signals obtained from the power supply circuit (1) to the central controller (2); the photosensitive signal detection circuit (5) feeds back lighting signals collected by the photoreceptor to the central controller (2); the central controller (2) judges the light control lamp is turned on or off according to signals provided by the photosensitive signal detection circuit (5) and sends turning on-off signals to the turning on-off operation control circuit (6); the turning on-off operation control circuit (6) controls running of the LED light source control circuit (7); the LED light source control circuit (7) provides stable supplying power for the LED light source for achieving lighting. The scheme disclosed by the invention can be applied in the field of the integrated intelligent light control lamp.

The invention discloses a power control module, comprising: a power control unit, a VGA, a digital domain AGC and a transmitting chain AGC, the power control unit firstly transmits the corresponding preset initial gain to the VGA, the digital domain AGC and the transmitting chain AGC respectively; before the power control module is stabilized, the power control unit executes the following operations cyclically: transmitting an instruction for augmenting the gain by preset stepping to the transmitting chain AGC, and sending a gain adjustment instruction for normalizing the power of output signals to 1 to the VGA; and when the power control module is stable, the power control unit transmits a gain adjustment instruction for normalizing the power of output signals to 1 to the VGA according to the preset cycle. The invention also discloses a transmitter-receiver comprising the power control module as well as a power control method. The invention can maintain the stability of the transmitter-receiver while eliminating echo signals.

According to an X wave band T/R assembly with switchable output power provided by the present invention, a receiving channel and a transmitting channel share a multifunctional chip, the six-phase shift and attenuation functions are achieved, and the amplification function of input signals is achieved; a transmitting channel can provide a large output power path and a small output power path, and the channel selection and switching is conducted through the control signals; a power amplifier is connected with a multifunctional chip and is used for amplifying the output power of the multifunctional chip so as to output an amplified signal with target power; the different amplification channels are selected by the control signal to perform the power amplification, and finally, the output signals with two different powers can be respectively generated; the amplitude-limiting low-noise amplifier chip is used for detecting and amplifying a signal outputted by the ring isolator in the receiving channel; a partition plate and a cover plate are arranged on a box body, and the partition plate is arranged between the driving amplifier and the power amplifier, so that the self-excitation caused by the mutual influence between the power amplifier devices is prevented, and the reliability of the T/R assembly is reduced. The cover plate is used for preventing the signal leakage and guaranteeing the stability of the microwave signals in a cavity.

The invention discloses a method for implementing ring redundancy networking of a serial port device. The method specifically comprises the following steps: S1, when a communication link is faulty, another wholesome communication link can be enabled, and a signal received by a transceiver is output to a transmitting end of the transceiver after meeting a signal received by the serial port device,and the node in a ring network can receive the data sent by any network node in the ring network; and S2, a loopback termination termination decision circuit detects an output signal of automatic data flowing to a control circuit. The invention relates to the technical field of industrial automation. By adoption of the method for implementing ring redundancy networking of the serial port device,the conversion between a differential signal and a transceiving single-end signal is realized, a worker does need to consume a lot of time to pay attention to the baud rate, the verification mode, theflow control and other parameters of the connected serial port device, and whether the present level node is the destination of loop data transmission is judged by detecting the signal sent by the serial port device connected with the present level node.

The invention provides a driving circuit of a field effect transistor, a driving system thereof and an air conditioner. The driving circuit comprises a driving module, a first resistor and a second resistor. The resistance of the first resistor is higher than a first preset resistance threshold. The resistor of the second resistor is lower than a second preset resistance threshold. The driving module is used for receiving an input control signal, and outputs a first driving signal with a high level when the control signal is in the high level; wherein after the first resistor, the first driving signal is input to the gate electrode of the external field effect transistor, thereby controlling conduction between the drain electrode and the source electrode of the field effect transistor. When the control signal is in the low level, the driving module outputs a second driving signal with a low level, wherein after the second resistor, the second driving signal is input into the gate electrode of the field effect transistor, thereby controlling switching-off between the drain electrode and the source electrode of the field effect transistor. The driving circuit, the driving system andthe air conditioner can reduce switch loss of the field effect transistor under a precondition that no self excitation of the field effect transistor is caused.

The invention discloses a miniature hearing aid. The miniature hearing aid comprises a battery, a switch, a single-pole three-throw switch, an inductor coil, a microphone, an earphone socket, resistors 1-9, capacitors 1-10, a potentiometer, and an audio amplification integrated chip with the model of SL8712, wherein a sound from the outside is converted by the microphone, sent into the audio amplification integrated chip, amplified by the audio amplification integrated chip and played by an insert earphone of the earphone socket; by changing a threshold of the potentiometer, the value of a volume signal can be changed; the fourth resistor, the fifth resistor, the fifth capacitor and the sixth capacitor form a high-frequency actuation network to prevent self excitation of a circuit; the second capacitor suppresses interference of a low-frequency signal; the third capacitor suppresses interference of a high-frequency signal. The miniature hearing aid has the characteristics of being small in size, light, convenient, attractive in appearance, low in power consumption, low in noise, high in anti-interference, and the like, and is simple in circuit structure, few in elements, low in cost and beneficial to popularization and promotion.

A control device for influencing a flow of energy in a load circuit between an electrical voltage source and an electrical load, having a semiconductor switch including a conductive section which is formed between an input connection and an output connection, can be looped into the load circuit, and has an electrical resistance adjustable by means of an electrical potential which can be applied to a control connection associated with the semiconductor switch, and having a control circuit which is coupled to the control connection and includes a freewheeling means connected in parallel to the load. The control circuit is designed to supply a control current at the control connection which is proportional to a voltage via the freewheeling means.

The invention discloses a pulse current-limiting lithium-ion battery charging power supply based on a low-pass filter circuit, which is characterized in that it mainly consists of a control chip U2, a diode rectifier U1, a transformer T, a thermistor RT, and a polar capacitor C1. Resistor R1, a low-pass filter circuit, a thyristor voltage regulator circuit, a gain in-phase amplifier circuit connected in series between the low-pass filter circuit and the VDD pin of the control chip U2, respectively connected to the terminal of the same name and the control terminal of the inductance coil L4 on the secondary side of the transformer T It consists of a power adjustment circuit connected to the chip U2, and a pulse current limiting circuit connected in series between the power adjustment circuit and the control chip U2. The present invention can provide the 4.2V reference voltage required for charging the lithium-ion battery; at the same time, the present invention can charge the lithium-ion battery with a constant current to 4.2V and switch to constant voltage charging, so that the present invention can provide a stable voltage for the lithium-ion battery. The charging voltage and current can effectively prevent the lithium-ion battery from being overcharged.

The invention discloses a high-performance radio frequency channel for a TDD LTE (time division duplexing long term evolution) tower mounted amplifier. The high-performance radio frequency channel for the TDD LTE tower mounted amplifier comprises an emission channel, a receiving channel and a high-speed switch assembly, wherein the emission channel is used for transmitting a downlink radio frequency signal; the receiving channel is used for transmitting an uplink radio frequency signal; the high-speed switch assembly is used for switching and isolating the emission channel and the receiving channel; the high-speed switch assembly comprises at least three high-speed switches SPST1-SPST3; the emission channel comprises two lambda/4 micro-strip lines and an ANT filter; and the receiving channel comprises an ANT filter, a low-noise amplifier (LNA), an RX channel filter and a bypass channel, wherein the bypass channel comprises two lambda/4 micro-trip lines and an ANT filter. The high-performance radio frequency channel for the TDD LTE tower mounted amplifier, which is disclosed by the invention, can be used for bearing high power and has the characteristics of low insertion loss and low noise, and base station communication is prevented from interrupting with the insertion loss as low as possible during power failure and amplifier breakdown.