31results about How to "Reduce capacitive reactance" patented technology

Disclosed herein is a built-in RFID tire tag. The built-in RFID tire tag includes an antenna and a circuit unit. The antenna is mounted in a tire, and is configured to be operated by resonating with radio waves, which are transmitted from an RFID reader and to have a repetitive corrugated shape. The circuit unit is configured to be operated by being supplied with power using the radio waves. The antenna includes a pair of tag radiators. Each of the tag radiators is divided into a first region and a second region. The corrugation density of the second regions, which are close to the circuit unit, is greater than that of the first regions, which are not close to the circuit unit. The first regions, which depend on rotational motion of the tire, adapt flexibly to bending and torsion of the tire by the difference between the corrugation densities.

The invention discloses a double-sound acousto-optic simulation electric firecracker, which comprises a circuit and a resonator for producing bright and explosive sounds; the explosive sound produced by the circuit for producing bright and explosive sounds is produced under the action of the resonator The high-pitched explosive sound and the low-pitched explosive sound, the circuit for generating light and explosive sound generates low-pitched explosive sound and high-pitched explosive sound successively through the resonator under the action of the control circuit. In the present invention, the blasting head mechanism utilizes the basic structure of the horn-type high-pitched horn, so that the airflow and sound generated by the electric spark can be transmitted, reflected, and resonated through the cavity of the high-pitched horn, and the multivibrous resonance with the resonator as a whole , to produce the sound effect of the first sound of "bang" similar to the second kick; the second blasting mechanism is equipped with a high-pitched blasting glass tube and an echo hole, and the airflow and sound generated by the electric spark are transformed by the second blasting mechanism to produce a "pop" ” sound, so as to realize the sound and light effect of electric firecrackers with two kicks.

The invention relates to a crystal oscillating circuit, which comprises an oscillating stage circuit, a direct current negative feedback circuit, and a push-pull amplifier circuit. The oscillating stage circuit generates an oscillator signal and outputs the oscillator signal to the direct current negative feedback circuit; the direct current negative feedback circuit performs amplitude control on the oscillator signal of the oscillating stage circuit and feeds back the oscillator signal to the oscillating stage circuit; the oscillating stage circuit outputs the oscillator signal which is subjected to the amplitude control to the push-pull amplifier circuit by the direct current negative feedback circuit; and the push-pull amplifier circuit is a post-stage amplifying circuit, amplifies the oscillator signal which is input and subjected to the amplitude control and outputs the oscillator signal to the outside. According to the invention, a transistor V5 adopts an emitter follower, so that an output load of the crystal oscillating circuit is less, and oscillation starting of the crystal is facilitated; and the capacitance of a capacitor which is connected in series with the crystal is increased, so that the capacitive reactance of the capacitor in the circuit is reduced, an alternating current which runs through the crystal is increased, and the driving power of the crystal is increased.

The invention discloses an EMC device which includes an apparatus that is easily interfered by high frequencies. The apparatus that is easily interfered by high frequencies is connected with a capacitance in parallel. The invention is connected with a capacitance in parallel on the apparatus that is easily interfered by high frequencies; when the frequency is low, the action of the capacitance isweak; when the frequency is high, the condenser component of the capacitance is diminished, the high frequency interference picked by the apparatus that is easily interfered by high frequencies gets short by the capacitance and can not be continuously spread, thereby reducing the high frequency interference and improving the performance of the EMC device.

A differential amplifier, comprising a pre-stage driver stage (106), an input balun (101), a matching network (102), a differential tube pair (103), a bias network (104) and an output balun (105); the pre-stage The output terminal of the driver stage (106) is connected to the input terminal (203) of the input balun (101); the output terminal (205) of the input balun (101) is connected to the input terminal of the matching network (102), and the output terminal of the matching network (102) is connected to the input terminal of the matching network (102). The input end of the differential tube pair (103) is connected to the bias network (104), and the output end of the differential tube pair (103) is connected to the output balun (105); the input balun (101) is a single-turn laminated transformer; the output balun (105) is the full-frame outer half-frame transformer in the plane. The input balun of the differential amplifier adopts a single-turn laminated transformer, and the output balun adopts an inner full-frame outer half-frame structure, so that the differential amplifier occupies a small space, has low loss, high operating frequency, and high power amplifier efficiency.

The invention relates to a telescopic antenna capable of stretching. The telescopic antenna is characterized by comprising a hollow radiation rod, a guide cylinder sleeved in the radiation rod and capable of lifting and moving relative to the radiation rod, a top rod assembly connected above the guide cylinder and capable of synchronously lifting along with the guide cylinder, and a lifting mechanism connected between the radiation rod and the guide cylinder and used for driving the guide cylinder to lift and move. The guide cylinder and the top rod assembly can be driven by the lifting mechanism to lift and move relative to the radiation rod; when the antenna does not need to work, the top rod assembly can be controlled to be totally contracted into the radiation rod so as to achieve theeffects of preventing the rain, dust, air and the sun, avoiding ageing, facilitating packing and transportation and the like; and when the antenna needs to work, the top rod assembly can be controlled to rise to a proper position, the effective height of the antenna is greatly increased so as to achieve better communication effect.

The invention relates to a piezoelectric low-energy-consumption broadband warning device for an automobile. The piezoelectric low-energy-consumption broadband warning device comprises a shell, wherein an opening is formed on the upper end face of the shell, and a sound transmission hole is formed in the lower end face of the shell; an installation cavity is formed in the shell; a vibration base plate is fixedly arranged in the installation cavity of the shell; a composite piezoelectric sheet is arranged on the upper end face of the vibration base plate, and a vibration thin film is arranged on the lower end face of the vibration base plate; the vibration base plate and the composite piezoelectric sheet form a vibration base source; the vibration thin film and the vibration base plate form a sound transmission source; a circuit board is arranged in the opening of the upper end face of the shell; a flexible circuit board is arranged in the installation cavity of the shell; the circuit board is electrically connected with the flexible circuit board; and the flexible circuit board is electrically connected with the composite piezoelectric sheet. The piezoelectric low-energy-consumption broadband warning device for the automobile has the advantages that the composite piezoelectric sheet serves as the vibration base source, a spring steel material of which the thickness is 0.15 mm to 0.25 mm is hollowed out and serves as the vibration base plate, the molded composite piezoelectric sheet is attached to the vibration base plate, and a layer of polyester vibration thin film is attached to the lower part of the vibration base plate to form the vibration base source, so resonant frequency can reach 800 HZ, high frequency reaches 20,000 HZ, and the performance of a product is improved.

A self-excited push-pull converter, which comprises a Royer circuit, wherein an inductor is further connected between a supply terminal of said Royer circuit and a center tap of primary windings of a transformer in said Royer circuit, an inductance amount of said inductor is less than 1 / 10 of the inductance amount of one of the primary windings of the transformer, and the center tap of said primary windings is a connection point between the two primary windings of said transformer. The self-excited push-pull converter of the present invention show high consistency, easy adjustment, low requirements on the manufacturing process and good short circuit protection performance.

The invention discloses a continuous rolling tube unit control system and method. The system comprises a plurality of electrical rooms, each electrical room corresponds to one mechanism of a pluralityof mechanisms correspondingly, the electrical rooms are placed nearby with the corresponding mechanisms, each electrical room is internally provided with a first PLC, a second PLC and a transmissiondevice, each first PLC is connected with the corresponding mechanism through the corresponding transmission device, each second PLC is used for adjustment and control of work environment information and upstream information of the corresponding transmission device, and the first PLCs and the second PLCs are in electric connection and are in electric connection with an engineer station correspondingly. According to the continuous rolling tube unit control system and method, the multiple electrical rooms are formed by splitting, each electrical room is arranged nearby at the corresponding mechanism, the cable lengths between the transmission devices and the corresponding mechanisms are relatively short, the transmission accuracy and stability are improved, the cable cost is saved, the work environment information and the upstream information of the transmission devices are adjusted and controlled through the second PLCs, and management and maintenance performed on the split electrical rooms are facilitated.

The invention discloses a data processing method, device, system and computer-readable storage medium based on the IIC protocol, comprising: receiving a control command sent by an IIC master device, and identifying the address for receiving the control command; A target function module corresponding to the address receiving the control instruction; using the target function module and the control instruction to realize the processing operation on the data in the storage system. The method, device, system and computer-readable storage medium provided by the present invention realize different functions according to a plurality of different addresses in the IIC slave device, and save system hardware cost.