698 results about "Resonance point" patented technology

An inductive wireless power system using an array of coils with the ability to dynamically select which coils are energized. The coil array can determine the position of and provide power to one or more portable electronic devices positioned on the charging surface. The coils in the array may be connected with series resonant capacitors so that regardless of the number of coils selected, the resonance point is generally maintained. The coil array can provide spatial freedom, decrease power delivered to parasitic loads, and increase power transfer efficiency to the portable electronic devices.

Provided is a wireless power transmission apparatus and method. The wireless power transmission apparatus may include a coupling unit to couple a reflected signal with respect to a transmitted resonance power, and a resonance point detecting unit to scan a frequency of the reflected signal to detect a resonance point. A resonance frequency of the source resonator may be controlled using the detected resonance point.

The invention discloses a matching device and matching method for an ultrasonic power supply. The matching device for the ultrasonic power supply comprises an ultrasonic signal generator, a drive isolation circuit, an ultrasonic power amplification circuit, a matching transformer, a tuning inductor, an ultrasonic transducer, a voltage sampling circuit, a current sampling circuit, a filtering and shaping circuit, a phase discriminator, an A / D converter, a single-chip microcomputer and a stepping motor. The output end of the matching transformer is connected with the tuning inductor; the output end of the tuning inductor is connected with the ultrasonic transducer; the voltage sampling circuit is used for collecting real-time working voltage signals at the two ends of a unit formed by the tuning inductor and the ultrasonic transducer, and transmitting the real-time working voltage signals to the phase discriminator. According to the matching device and matching method for the ultrasonic power supply, static impedance matching and dynamic impedance matching can be achieved, the matching inductance value can be tracked and adjusted through the phase difference of working currents and working voltages of the ultrasonic transducer, it can be ensured that the ultrasonic transducer always works at a resonance point, the maximum useful power output of the ultrasonic transducer can be achieved, in addition, the adjusting response speed is high, and accuracy is high.

A slit (15) is formed between a feed point and GND point of an inverted-F antenna to make the points electrically distant from each other, and at least three antenna elements (14a, 14b, and 14c) are formed. The at least three antenna elements (14a, 14b, and 14c) generate at least three resonance points. An antenna radiating plate (3) projects outwardly so that at least a major part thereof does not face a ground plate (4). Therefore, a multi-band antenna device capable of achieving a wider bandwidth without using a parasitic element, and a communication terminal apparatus are provided.

There has been a problem in battryless RFID chips that a high voltage AC signal is generated when an antenna is exposed to a high electromagnetic field, and a DC voltage that is obtained through rectification of the AC signal becomes a high voltage accordingly. As a result, heat generation of a logic circuit and a clock generator circuit or element break down occur. The invention takes the following measures: a DC voltage generated through rectification of an AC signal is compared with a reference voltage in a comparator circuit, and a switch element is turned ON when the DC voltage becomes higher so as to add capacitance to an antenna circuit. Accordingly, resonance point of an antenna changes which in turn attenuates an AC signal generated in the antenna circuit, thereby suppressing a DC voltage.

The invention relates to an automatic frequency tracking method and a system for an ultrasonic transducer. A direct digital frequency synthesizer is used as a signal source, wherein the direct digital frequency synthesizer can be an independent integrated chip and also be achieved by the method that a digital part of a DDS is integrated in a site programmable logical element FPGA and then a digital-analog converter is additionally added. The design of the invention adopts a frequency sweeping and tracking policy, and an automatic frequency controller achieved by the programmable element controls the output frequency of the DDS according to a feedback signal sampled from the self transducer end so as to achieve the full digitization automatic frequency tracking and ensure that the ultrasonic transducer work near a resonance point all the time to obtain the optimal efficiency. A phase comparator utilizes a trigger to give out the arriving time difference of two riser edge signals of two input signals I ph and V ph aiming to the sensitive characteristics of the riser edge signals, and the sequence of the riser edge signals of the two input signals I ph and V ph is given out by a Dirrect pin.

An inductive wireless power system using an array of coils with the ability to dynamically select which coils are energized. The coil array can determine the position of and provide power to one or more portable electronic devices positioned on the charging surface. The coils in the array may be connected with series resonant capacitors so that regardless of the number of coils selected, the resonance point is generally maintained. The coil array can provide spatial freedom, decrease power delivered to parasitic loads, and increase power transfer efficiency to the portable electronic devices.

An image display apparatus capable of displaying an image on a plane of projection by beam raster scanning associated with resonant oscillation in a horizontal scanning direction (the main scanning direction), includes a resonance-point detector for detecting a mechanical resonant frequency in the horizontal scanning direction. Out of frequencies that are multiples of a vertical synchronizing frequency in image display, for example a frequency nearest to the mechanical resonant frequency detected in the resonance-point detector is determined as a horizontal scanning frequency of the raster scanning. The image display apparatus can thus provide a stable image display with ease.

The invention discloses a dynamic matching device of an ultrasonic power supply and a method thereof. The dynamic matching device comprises an ultrasonic signal generator, a driving isolating circuit, an ultrasonic power amplifier, a matching transformer, a tuning inductor and an ultrasonic transducer which are successively in serial connection, and further comprises a voltage and current sampling circuit, wherein the voltage and current sampling circuit is successively connected through a backward stage isolating circuit, a filter shaping circuit and a programmable logic device (PLD), a phase measurement unit is arranged in the PLD, and a pulse width modulation (PWM) drive pulse output end of the PLD is connected with the ultrasonic signal generator. According to the dynamic matching device and the method thereof, frequency of ultrasonic driving signals is dynamically regulated through real-time monitoring of the impedance characteristic of an ultrasonic transducer circuit, a dynamic matching process is achieved, the fact that the transducer works on a resonance point all the time is guaranteed, the maximum available power is outputted, matching precision is high, the circuits are simple, achieving cost is low, achievement is easy, and a wide application prospect is provided.

A vibrator includes a voice coil and a vibrating member that vibrates along the axial direction of the voice coil when it is excited by application of an alternating current thereto. A suspension supports the vibrating member vibratably in the axial direction. A casing houses the voice coil, the vibrating member, and the suspension. A buffering member is provided so that the vibrating member strikes the buffering member when the vibration amplitude of the vibrating member has exceeded a predetermined value in a resonance region around the resonance point of the vibrating member.

The invention discloses a data transmission method for an inductive power supply. A power supply microprocessor of a power supply module is connected with a power circuit, a power supply information integration unit, a power supply driving unit and a power supply signal resolution combination, the power supply driving unit and the power supply signal resolution combination are connected with a resonance circuit which is connected with a power supply coil. A current collection module and a current collection coil are connected with the resonance circuit. The resonance circuit is connected with a signal processing unit and a current collection unit. A current collection microprocessor is connected with the signal processing unit and a current collection information integration unit. The power supply microprocessor scans and senses a resonance point of the power supply coil, transmits a short section of power supply energy to confirm whether the current collection module feeds a signal back or not, supplies power if the current collection module feeds the signal back, checks whether the power supply information integration unit has data to be transmitted or not and whether the power supply signal resolution combination receives the signal or not, and performs signal modulation and transmission or data decoding and subsequent processing to realize power supply and data signal transmission by a wireless transmission method.

The present invention provides, in a vehicular power transmitting apparatus including a differential portion electrically controlled, a control device which can quickly decrease the engine rotation speed, even if the operational state of an electric motor is limited. An engine-stop controlling means (112) includes limiting means for limiting the differential state of a differential portion (11) by a switching brake (B0) and a switching clutch (C0) when the operational state of a first electric motor (M1) is limited. Therefore, a torque in a direction for decreasing a rotation speed (NE) of an engine (8) is applied by limiting the differential state of the differential portion (11), for example, in a vehicle stopped state. As a result, the rotation speed (NE) of the engine (8) is quickly decreased to pass through a resonance point in a short time, whereby occurrence of resonance phenomena can be prevented.

The invention relates to multi-sensing system of passive wireless acoustic surface wave and recognition method of frequency division used in the system. Multi resonators of acoustic surface wave with their resonant frequency being distributed at different resonance point are as multi sensors. Reception and treatment of the signal are as follows: an adjustable local oscillation controlled by computer program is connected to power amplifier through receiving and transmitting switches, sending a query signal: passing antenna, receiving and transmitting switches, radio frequency amplifier, band-pass filter, A / D converter, the echo wave of said query signal enters computer. Since the query signal with different frequencies being produced by local oscillation controlled by computer program, and the sensing signals being produced by multi resonators for acoustic surface wave, thus only one system can recognize and query more signals sensed in a monitored environment.

The moment of inertia and the eccentric load are measured in rotating a drum at 100 rpm, and the decision critical value is decided according to the moment of inertia and the eccentric load(S31-S42). The motor is controlled to accelerate within the range of 140 to 220 rpm less than the resonance point of about 250 rpm, and the value is measured according to fluctuation of acceleration(S43-S47). The large vibration is decided, and the emergency stop is performed in case of the value from the acceleration fluctuation to be over the critical value(S48). Acceleration is changed by adding uneven load to the bearing in rotating while reducing eccentric load, and the critical value is decided accurately according to the moment of inertia and the eccentric load.

The invention provides mobile electronic equipment, which comprises a shell, a slot antenna and a communication module, wherein the shell at least comprises a first part of a metal material; the first part at least comprises a first metal surface and a second metal surface which are connected with each other; the slot antenna is engraved on the first part and used for radiating a signal and comprises a first resonance branch provided with a feedback point; the first resonance branch comprises a main body and a tail; the main body is engraved on the first metal surface; the tail extends to the second metal surface from the main body and hollows out of the second metal surface; the first resonance branch forms a 1 / 4-wavelength slot antenna and corresponds to a first resonance point; and the communication module is connected with the slot antenna through coaxial cables at the feedback point and used for supplying the signal. According to the mobile electronic equipment, the problem about implementation of the antenna of the mobile equipment with the full metal shell is solved; and the size of a 3G antenna can be effectively reduced.

A plasma processing apparatus, for performing a plasma processing on a substrate to be processed by generating a plasma of the processing gas in an evacuable processing chamber, includes an impedance adjusting mechanism. The impedance adjusting mechanism is provided with a resonance circuit formed to allow a radio frequency current to flow into the first electrode; a variable impedance unit installed on a power feed line to the first electrode; a detector for detecting an apparatus state to be used to search a resonance point of the resonance circuit; and a controller for searching a resonance point of the resonance circuit by detecting a signal of the apparatus state of the detector while varying a value of the variable impedance unit in a state where the plasma is formed and then adjusting the value of the variable impedance unit at the resonance point to a reference value.

The invention provides a wireless energy and signal synchronous transmission system based on a multi-resonant technique, relating to the technical field of wireless power transmission and aiming to solve the problem that stable power output can not be obtained as the transmitted energy is affected by amplitude modulation in existing energy and signal synchronous transmission methods. The system has the beneficial effects that LC series-parallel circuits with a plurality of resonance points serve as primary / secondary side resonance matching circuits, so that different frequencies are used for energy transmission and communication respectively, thus minimizing mutual effects of energy and data while energy and data synchronous transmission is achieved; the system can be applied underwater and underground and to other media based on the communication mode of near-field resonant coupling; the system can achieve full-duplex communication and half-duplex communication of primary and secondary sides, simplex communication from the secondary side to the primary side and simplex communication from the primary side to the secondary side while energy is continuously transmitted, without extra antennae, and can lengthen the distances of energy transmission and communication by increasing the relay; the system is suitable for wireless energy and signal synchronous transmission.

A boundary acoustic wave device includes a first medium layer made of a first dielectric material and a second medium layer made of a second dielectric material having an acoustic velocity different from the acoustic velocity of the first dielectric material. The first medium layer and the second medium layer are disposed on a piezoelectric substrate, and an IDT electrode is arranged along the interface between the piezoelectric substrate and the first medium layer. When the fast transverse bulk wave of the piezoelectric substrate has an acoustic velocity V1 and a higher-order mode boundary acoustic wave has an acoustic velocity Va at an anti-resonance point, the boundary acoustic wave device satisfies the relationship Va>V1.

A vibrator includes a voice coil and a vibrating member that vibrates along the axial direction of the voice coil when it is excited by application of an alternating current thereto. A suspension supports the vibrating member vibratably in the axial direction. A casing houses the voice coil, the vibrating member, and the suspension. A buffering member is provided so that the vibrating member strikes the buffering member when the vibration amplitude of the vibrating member has exceeded a predetermined value in a resonance region around the resonance point of the vibrating member.

The invention discloses an ultrasonic scalpel system based on frequency and power tracking and a control method thereof. The ultrasonic scalpel system comprises a main control MCU, a DDS-based signalgeneration control module, a power output isolation module, an interaction module and a medical switching power supply, wherein the signal generation control module uses a DDS chip to generate two paths of high-precision PWM signals with specific frequencies, and the power is controlled by a digital control half-bridge power adjusting circuit based on a clock circuit; and the power isolation module is used for matching the inductive reactance through the series power inductance, providing an interface for an ultrasonic scalpel, and respectively using a PID algorithm and an ADRC algorithm to control the power output and the working frequency of the ultrasonic scalpel in real time so as to achieve the real-time control of the power and the follow-up control of the resonance point frequency.The system has the advantages of high control precision, high response speed, good operation effect, high energy utilization rate, convenient operation and the like, and is suitable for driving ultrasonic surgical scalpel equipment in common ultrasonic surgical operations.

A method for avoiding electrical resonance in a vehicle having a high-voltage (HV) direct current (DC) bus shared by a first and a second power electronic converter device, such as an air conditioning compressor module (ACCM) and a traction power inverter (TPIM), includes determining an impedance characteristic of the bus, defining resonance points for the bus, selecting lower and upper switching frequency boundaries for the TPIM, and preventing the TPIM from operating within a range defined by these boundaries. A vehicle includes the first and second power electronic converter device, e.g., the APPM and the TPIM, the shared HV DC, and a controller having the algorithm set forth above, wherein the controller is adapted for avoiding electrical resonance in the HV DC bus by executing the algorithm.

There has been a problem in battryless RFID chips that a high voltage AC signal is generated when an antenna is exposed to a high electromagnetic field, and a DC voltage that is obtained through rectification of the AC signal becomes a high voltage accordingly. As a result, heat generation of a logic circuit and a clock generator circuit or element break down occur. The invention takes the following measures: a DC voltage generated through rectification of an AC signal is compared with a reference voltage in a comparator circuit, and a switch element is turned ON when the DC voltage becomes higher so as to add capacitance to an antenna circuit. Accordingly, resonance point of an antenna changes which in turn attenuates an AC signal generated in the antenna circuit, thereby suppressing a DC voltage.

The present invention provides a power line terminating circuit and method and a power line relay device for setting indoor power lines to a state adapted to communications by making impedances match each other irrespective of a device connected, thereby enabling noise entering from an electric device to the power lines to be reduced. By a capacitor (33) provided between connection ends (35A) and (35B) and an inductor (34) provided between a termination (32A) of an indoor power line (1A) and the connection end (35A), a series resonance circuit having a series resonance point in a frequency band which is higher than a frequency of a power source voltage and is lower than a communication frequency band is configured. A resistor (31) having a resistance value corresponding to a characteristic impedance of the indoor power line (1A) and an indoor power line (1B) is provided in parallel with the inductor (34). Irrespective of the presence or absence and the kind of a load (electric device (5)), an input impedance of a power line terminating circuit (30U) is made constant in the communication frequency band and reflection caused by impedance mismatching at the terminations of the power lines can be prevented. Thus, communication quality of the power line communication can be maintained.

A compound antenna containing two fractals belongs to the technical field of multiband small size antenna. On the basis of the traditional fractal antenna, an antenna fractal is added, the two fractal antennae form the compound antenna; wherein one fractal construction unit is taken as a feeding unit of the whole antenna; when the feeding unit obtains electromagnetic wave energy from a feed source by a feeder line, coupling current can be generated on the fractal parasitized or connected with the other fractal antenna; when the coupling current and current on the feeding unit are in the same flow direction and the same phase position, the two currents in the same flow direction lead the distant field radiation to be superimposed in phase, thus improving the radiation characteristic of the antenna, achieving the impedance matching in the frequency band near the resonance point and expanding the frequency bandwidth. The applicable frequency range of the compound fractal antenna is from UHF frequency band of hundreds of MHz to millimeter wave frequency band of dozens of GHz.

A system is provided that includes a torch power unit. The torch power unit includes a compressor and a controller configured to adjust the compressor based on a profile indicating a resonance point for the compressor. A method is also provided that includes adjusting the compressor to reduce vibrations or movement of the compressor based on a resonance point. A machine-readable medium that includes code that includes instructions to adjust a rate of velocity change based on a resonance point is also provided. A method of operation is provided that includes reducing vibrations associated with a resonance point of the device by increasing the rate of velocity change at the resonance point as compared to non-resonance regions.

The invention discloses a vibration protection method and a vibration protection device of a pipeline of an air conditioning compressor, which belong to the technical field of air conditioners. The method comprises the steps of obtaining vibration data of the air conditioning compressor during operation; determining the amplitude and strain capacity of a refrigerant pipeline which is in vibration transfer relation with the compressor according to the vibration data; and controlling the compressor to change frequency when the amplitude and strain capacity satisfy preset vibration conditions. According to the vibration protection method of the pipeline of the air conditioning compressor, the vibration data of the compressor during operation are detected, so that whether the amplitude and strain of the related refrigerant pipeline are within a reasonable range can be analyzed and judged, and thus, if the amplitude and strain of the related refrigerant pipeline are not within the reasonable range, resonance points which possibly result in breaking of welding spots of the pipeline can be avoided by performing frequency conversion treatment on the air conditioning compressor, so that the reliability of the air conditioning refrigerant pipeline is guaranteed, and potential safety hazards caused by refrigerant leakage are reduced.

A Mach-Zehnder optical switch structure based on coupling of double resonant cavities comprises a pair of input waveguides, a front coupler, a rear coupler, a pair of output waveguides and a pair of optical resonant cavities, wherein the input end of the front coupler is connected with the input waveguides and is used for dividing a path of light into two paths of light, and the two paths of light enter an upper interference arm and a lower interference arm respectively; the rear coupler combines the two paths of light into one path of light to be coupled into a certain optical waveguide of the input waveguides; one end of each output waveguide is connected with the output end of the rear coupler; the two ends of the upper interference arm and the two ends of the lower interference arm are connected with the front coupler and the rear coupler respectively; the optical resonant cavities are coupled with the upper interference arm and the lower interference arm respectively. According to the Mach-Zehnder optical switch structure, the advantage of drastic phase changes of wave lengths near resonance points is utilized, the two-arm interference characteristic of the Mach-Zehnder interference structure is combined, the refractive index of one resonant cavity only needs to be changed, and light signals are output from different ports.

A ladder SAW (surface acoustic wave) filter which includes a first SAW resonator disposed in a parallel arm and a second SAW resonator disposed in a series arm, has an inductor connected parallel to at least one of the first SAW resonator and the second SAW resonator. The frequency of a resonance point or an anti-resonance point of the at least one of the first SAW resonator and the second SAW resonator is adjusted by changing the inductance value of the inductor.

A broadband dual-polarized antenna comprises a feeding panel, a dielectric panel, a radiant panel and a director, wherein the radiant panel comprises a +45-degree polarization oscillator and a -45-degree polarization oscillator which is orthogonal to the +45-degree polarization oscillator, and each polarization oscillator comprises two radiant sub-panels; the feeding panel comprises a first feeding sub-panel and a second feeding sub-panel, the dielectric panel is supported on a reflecting panel through coaxial feeders, the feeding panel and the radiant panel are printed on the upper layer and the lower layer of the dielectric panel, the feeding sub-panels of the feeding panel are connected with inner conductors of the coaxial feeders respectively, the first feeding sub-panel is aligned to one radiant sub-panel of the +45-degree polarization oscillator so as to conduct coupled feeding, the second feeding sub-panel is aligned to one radiant sub-panel of the -45-degree polarization oscillator so as to conduct coupled feeding, and outer conductors of the coaxial feeders are connected with the other two radiant sub-panels respectively so as to conduct feeding; the director is arranged above the feeding panel, the feeding panel is used for controlling a high-frequency resonance point, the radiant panel is used for controlling a low-frequency resonance point, and the director is used for controlling a high frequency radiation pattern. The broadband dual-polarized antenna improves broadband matching performance.

The invention provides a washing machine, wherein a washing dehydration tank and a pulsator integrally formed in an outer groove is rotated at a high speed so as to perform the dehydration of laundry. Meanwhile, a mechanism is provided to restrain the vibration of the washing dehydration tank via the electrical control. When the outer groove is made of synthetic resin, the intrinsic value of the outer groove (inherent resonance point) varies with the temperature. When the temperature of the outer groove rises, the rotation speed of the washing dehydration tank is lowered so as to be away fromthe inherent value of the outer groove and prevent the abnormal vibration. In addition, the temperature of the outer groove can also be directly or indirectly determined. If the temperature rises, the dehydration speed is lowered. If the temperature decreases, the dehydration speed is increased. Meanwhile, by utilizing a washing machine with drying function, wherein the circulation of the washingdehydration tank is realized by the heating of a heater, if the temperature at the outlet of the heater rises, the dehydration speed is lowered. If the temperature decreases, the dehydration speed isimproved.