690 results about "Resonance point" patented technology

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.

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.

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.

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.

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 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.

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 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 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.