120 results about "Primary resonance" patented technology

A coil unit performs at least one of transmission and reception of electric power using electromagnetic resonance between the coil unit and a primary resonance coil disposed to face the coil unit. The coil unit includes a secondary resonance coil that includes a plurality of coils, and that electromagnetically resonates with the primary resonance coil. A first coil among the plurality of coils is disposed in a manner such that a magnetic field generated by the first coil has a phase opposite to a phase of a magnetic field generated by at least one coil other than the first coil among the plurality of coils, with respect to a plane that faces the primary resonance coil.

A multilayer helical wave filter having a primary resonance at a selected MRI RF pulsed frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance.

The invention belongs to the technical field of wireless power transmission, and particularly relates to a magnetic coupling dual-mode wireless power transmission device and a control method thereof. By the magnetic coupling dual-mode wireless power transmission device, wireless power transmission efficiency can be improved, and power loss is small. The magnetic coupling dual-mode wireless power transmission device comprises a transmitting end and a receiving end and is structurally characterized in that the transmitting end comprises a primary induction coil, a primary resonance coil, a primary resonance capacitor, a primary switch, a high-frequency inversion circuit, an IGBT driving circuit, a switch power source, an external power source interface, a transmitting end control unit, a primary induction coil voltage sampling module, an ADC conversion circuit A and a Wi-Fi module A, and a power input port of a switch power source is connected with the external power source interface while a power output port of the same is connected with a power input port of the high-frequency inversion circuit.

The invention relates to a vibratory stress relief apparatus for medium frequency and low frequency shaft type parts, and a use method thereof. The apparatus comprises a vibration exciter, a support block for clamping and supporting a workpiece, and a support mechanism connected with the support block. The support mechanism comprises a pair of support frames comprising a left support frame and a right support frame, and a support seat for installing the left support frame and the right support frame, wherein the left support frame and the right support frame right are arranged relatively. Thesupport block respectively forms rotatable connections with the left support frame of the support mechanism and the right support frame of the support mechanism. The apparatus further comprises a vibration exciter base for installing the vibration exciter, wherein the vibration exciter base is arranged on the middle portion of the workpiece, the vibration exciter, the vibration exciter base and the workpiece synchronously vibrate during vibratory stress relief. According to the present invention, a simply supported beam form is adopted, the flexural vibration type primary resonance is generated by the shaft type parts under the excitation of the vibration exciter at the natural frequency adopted for shaft flexural vibration; in the prior art, the dynamic stress generated by the apparatus does not reach the requirement of residual stress decreasing, with the apparatus provided by the present invention, the problem in the prior art is solved; the deformation amounts on both ends of the shaft are substantially improved; the dynamic stress distribution of the shaft is uniform so as to effectively reduce the residual stress of the shaft part.

A loudspeaker comprises a diaphragm, an edge operable to support, on a frame, the diaphragm in such a manner that enables vibration thereof, and a voice coil operable to generate a driving force. The voice coil is of an approximate rectangular shape, and a length of a long axis direction of the voice coil is no less than 60% of a length of a long axis direction of the diaphragm. Positions of long sides of the voice coil to be fixed on the diaphragm are positions corresponding to nodes of a primary resonance mode in a short axis direction of the diaphragm, or in the respective vicinities thereof. Accordingly, it is possible to realize a high sound quality loudspeaker having a narrow width (elongated structure), but not easily causing resonance, thereby obtaining a flat frequency characteristic.

A DC composite pulse high voltage power supply for an electrostatic precipitator comprises a pulse high voltage power supply, a DC high voltage power supply and a composite circuit. Output of the pulse high voltage power supply is coupled with the composite circuit; output of the DC high voltage power supply is coupled with the composite circuit; and output of the composite circuit is connected with the electrostatic precipitator. The pulse high voltage power supply provided by the invention is treated with voltage regulation, voltage boost and rectification by a three-phase power supply; andthe high voltage pulse is generated under the control of an electronic switch through the primary resonance of capacitor and transformer. The invention solves the problem that low peak voltage and average value voltage of the precipitator easily lead to back corona in the prior power supply technology. According to the invention, the DC high voltage and pulse high voltage are combined together toform the composite pulse voltage, so as to increase the peak voltage of the precipitator, accelerate the driving velocity of dust, prevent the occurrence of back corona, realize energy saving and improve dust collection efficiency; besides, the invention has good social and economic benefits.

A band pass filter processing extracts the vibration component (frequency component) of the 1st to the 4th order frequency band from the output of the knock sensor. A primary frequency band is established as the frequency band containing the fundamental frequency (primary resonance frequency) which is the lowest frequency of the knocking vibration frequencies. The 2nd to the 4th order frequency band is established as the frequency band containing the 2nd to the 4th order resonance frequency. Based on the vibration strength of the primary frequency component, the comparison result between the composite vibration waveform which compounded the 1st to the 4th order frequency component and the ideal knock waveform, and the vibration strength of the summation of the 1st to the 4th order frequency component, the noise and knocking are distinguished from each other with sufficient accuracy.

The invention discloses a back light source drive circuit directly driving a lamp strip circuit by using a primary half-bridge resonance circuit. The back light source drive circuit comprises a primary resonance circuit, a secondary lamp strip circuit and an optical isolating feedback circuit having an optical coupling feedback function, wherein the primary resonance circuit generates a driving pulse signal according to the received external voltage and a current signal fed back by the optical isolating feedback circuit, and provides needed work voltage for the secondary lamp strip circuit according to the driving pulse signal; and the optical isolating feedback circuit samples the loaded current in the secondary lamp strip circuit in real time, and feeds back the current signal to the primary resonance circuit. The back light source drive circuit directly lightens and controls the back light source by using the primary half-bridge resonance circuit; and optical coupling is used as the feedback control from the secondary level to the primary level. The drive circuit is simplified so as to eliminate a secondary side LED driving chip, and reduce device number of the whole system.

The invention discloses a wireless energy transmission system based on a magnetic resonance array, belonging to the wireless energy transmission field. A primary part in the system consists of a main power converter, a primary resonance capacitor, a primary magnetic induction coil and a primary magnetic resonance array. A secondary part consists of a secondary magnetic induction coil, a secondary resonance capacitor, a power controller and a secondary magnetic resonance array. Each one of the primary magnetic resonance array and a secondary magnetic resonance array consists of a plurality of magnetic resonance units; each magnetic resonance unit comprises a magnetic resonance coil and a resonance tuning capacitor; and the head ends and the tail ends of the magnetic resonance coils are respectively connected with both ends of the resonance tuning capacitors. In the wireless energy transmission system provided by the invention, the difficulty of an excitation frequency on selection is greatly reduced, the problem that the magnetic resonance coils are difficult to tune is solved, and the flexibility of the system utilization is improved.

A multilayer helical wave filter having a primary resonance at a selected RF diagnostic or therapeutic frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance.

In an ultrasonic motor, an elliptical vibration is generated by combining a longitudinal primary resonance vibration resulting from an expansion and a contraction of the vibrator in a direction of the central axis and a torsional secondary resonance vibration or a torsional tertiary resonance vibration resulting from twisting of a rotation axis, and the dimension ratio of the rectangle of the vibrator is chosen such that a resonance frequency of the longitudinal primary resonance vibration, resulting from the expansion and the contraction of the vibrator in the direction of the central axis and a resonance frequency of the torsional secondary resonance vibration or the torsional tertiary resonance vibration resulting from twisting of the rotation axis match. The vibrator includes a torsional piezoelectric body that generates a thickness shear vibration, and that is arranged at an anti-node position of the torsional secondary resonance vibration or the torsional tertiary resonance vibration.

The invention discloses a constant-current and constant-frequency inductively coupled transmission system and a design method thereof. The system comprises a direct current power supply, a high-frequency inverter, a primary reactive compensation mechanism, a mutual inductance coupling mechanism, a secondary reactive compensation mechanism, a rectifier and filter device and a variable load. The constant-current and constant-frequency inductively coupled transmission system is characterized in that wireless transmission of primary and secondary electric energy is achieved through the mutual inductance coupling mechanism; high-frequency sine alternating current which is picked up by the primary side of the mutual inductance coupling mechanism is rectified and filtered through the rectifier and filter device; the output current is constant; the whole system works in a complete resonant state and does not change along with change of the load; and the power supply requirements of the current-type variable load are met. The constant-current and constant-frequency inductively coupled transmission system has the significant effects that through certain topology designs of primary and secondary reactive compensation mechanisms and a system parameter design, constant outputs of the load current and the primary resonance current of the system under a variable load condition are achieved; the stability of the working frequency of the system is ensured; and the system is simple in overall structure and safe and reliable to work.

A coil structure for wireless power transmission is provided. The coil structure comprises: a primary resonance coil wound in a spiral shape around a centripetal point; a primary induction coil, which supplies power to the primary resonance coil in a nonconnected state with an input or output terminal of the primary resonance coil and is wound in a spiral shape on a substantially same plane around a substantially same centripetal point as the centripetal point; a switch configured to be parallel with the primary resonance coil so as to control the ON and OFF of an operation of the primary resonance coil; and a capacitor coupled to the primary resonance coil so as to form a magnetic resonance with the primary resonance coil.

A multilayer helical wave filter having a primary resonance at a selected RF diagnostic or therapeutic frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance.

The invention provides an IPT system primary power regulation method and system based on controllable inductance. The power regulation method comprises the following steps that a voltage type IPT system is established, a primary resonance inductor comprises a coil of N turns, the Nth turn of the coil is connected with a coil control switch Kn in series, equivalent load impedance values and primary resonance inductor optimal values are preset in a controller, and the equivalent load impedances and the primary resonance inductance optimal values correspond to each other one by one; the controller works out the equivalent load impedance value and obtains the primary resonance inductance optimal value according to the corresponding relation between the equivalent load impedance values and the primary resonance inductance optimal values, and controls switching-on and switching-off of the coil control switch Kn, and therefore regulation of the primary resonance inductor is achieved. By the adoption of the IPT system primary power regulation method and system based on the controllable inductance, the number of the turns of the coil which is connected to a circuit is adjusted according to the load, and the primary resonance inductance and the effective area and the magnetic flow area which exist in the process of practical work of the primary coil are regulated according to the load; when the IPT system works at different loads, the IPT system can achieve the optimal system efficiency and electromagnetic radiation is reduced to the maximum extent.

The invention provides a power supply circuit. The power supply circuit comprises a resonance control circuit, an isolation driving circuit, a first output circuit and a second output circuit, wherein the resonance control circuit receives first direct current from exterior and a driving signal from the isolation driving circuit, and respectively outputs second current to the first output circuit and the second output circuit according to the driving signal and the first direct current; and the isolation driving circuit is connected to the resonance control circuit and is used for outputting the driving signal to the resonance control circuit. The invention also provides a liquid crystal television. According to a technical scheme of the invention, a high-power LED (light-emitting diode) backlight source is driven by using a secondary circuit to control a primary resonance circuit, and the power supply for a main board is , controlled and integrated through the feedback of a double loop.

The invention provides a light-emitting diode (LED) backlight driving circuit which comprises a rectifying filtering circuit, a resonance control circuit and an isolation driving circuit, wherein the rectifying filtering circuit receives alternating current input and outputs first direct current to the resonance control circuit, the isolation driving circuit is connected to the resonance control circuit and is used for outputting a driving signal, the resonance control circuit receives the driving signal from the isolation driving circuit and outputs second direct current to an LED backlight according to the driving signal and the first direct current. The invention further provides a liquid crystal television. According to the technical scheme of the LED backlight driving circuit and the liquid crystal television, a secondary circuit is utilized to drive and control the primary resonance circuit to supply power to the backlight, design of an original power supplying circuit is greatly simplified, production cost is reduced, and space utilization rate of a circuit board is also improved.

The invention relates to a sensor system (102) for measuring a velocity of a fluid (110) flowing through a channel (108), comprising a heating element (104) for heating the fluid, wherein the heating element (104) is provided with a predetermined level of power during operation. The sensor system (102) furthermore comprises a primary electronic circuit (114) having a primary resonance frequency, which primary resonance frequency is temperature dependent. Herein the temperature of the primary electronic circuit (114) is determined by heat transferred from the heating element (104) to the fluid (110) flowing through the channel (108). In addition, the sensor system (102) comprises a transducer arrangement (126) configured for generating a measurement signal (128) indicative for the velocity of the fluid (110) flowing through the channel (108). Herein, the measurement signal (108) is based on the primary resonance frequency.