545 results about "Self-oscillation" patented technology

An optical atomic magnetometers is provided operating on the principles of nonlinear magneto-optical rotation. An atomic vapor is optically pumped using linearly polarized modulated light. The vapor is then probed using a non-modulated linearly polarized light beam. The resulting modulation in polarization angle of the probe light is detected and used in a feedback loop to induce self-oscillation at the resonant frequency.

A robot apparatus having a plurality of movable sections includes a motion control section that generates a control signal for the periodic motion of at least part of the movable sections according to the output of an oscillator showing self-oscillation and entrainment characteristics, an environment measuring section that measures the motion according to the control signal for the movable sections or the physical environment at the time of the motion of the movable sections, a periodic oscillator control section that inputs a periodic signal to the oscillator as feedback according to the outcome of the measurement by the environment measuring section and generates an entrainment phenomenon and a non-periodic oscillator control section that inputs a non-periodic or temporary feedback signal to the oscillator.

The invention provides a self-oscillation type high power LED constant-current drive circuit with low cost, high reliability and stability and high drive efficiency, the circuit comprises a rectifier and filter circuit, a switching circuit, a steady voltage constant current output circuit, a transformer, a self-oscillation type pulse width modulation signals generating circuit and a current feedback obstruction circuit, wherein the rectifier and filter circuit accesses commercial power into rectification, changes the commercial power into direct current, and then outputs commercial power to the switching circuit to switch in a self-oscillation type with high frequency, then high frequency voltage of the steady voltage constant current output circuit is transformed into direct voltage through the transformer to drive the LED, simultaneously sampling current signals produces jam signals through the current feedback obstruction circuit to control the switching circuit to work, the circuit does not adopt any driving chips and only uses fewer common individual devices to form a self-oscillation type structure to drive the switching circuit and to combine current feedbacks, which realizes constant current driving of the high power LED.

An optical atomic magnetometers is provided operating on the principles of nonlinear magneto-optical rotation. An atomic vapor is optically pumped using linearly polarized modulated light. The vapor is then probed using a non-modulated linearly polarized light beam. The resulting modulation in polarization angle of the probe light is detected and used in a feedback loop to induce self-oscillation at the resonant frequency.

A fiber laser of an MOPA type includes an MO which is a laser oscillator for generating seed light, a PA which is a light amplifier connected to a rear stage of the MO, for amplifying and outputting laser light emitted from the MO, and a reflection device which is provided between the MO and the PA. According to the present invention, the MOPA type fiber laser can decrease the peak value of the pulse which is emitted toward the MO or the pump light source by self-oscillation or reflection, and makes it unlikely that the pump light source or the MO will be damaged.

The invention discloses a double-closed-loop control circuit of a micromechanical gyroscope and belongs to the field of guide or control devices based on a Coriolis effect. The circuit is used for closed-loop control of driving and detection modes of the micromechanical gyroscope. A simplified self-oscillation closed-loop control circuit based on automatic gain control (AGC) is employed for the driving mode of the circuit, and the frequency stability and amplitude stability of the micromechanical gyroscope in the driving mode can be effectively improved; and a six-order continuous band-pass Sigma Delta M closed-loop control circuit for the detection mode has six-order noise reshaping capacity, and the signal to noise ratio (SNR), linearity and zero-bias stability of a system detection signal can be improved. The double-closed-loop control circuit of the micromechanical gyroscope is easy to control and simple, the accuracy of a system is improved, the SNR of the system is high, and the system is self-adaptively adjusted and high in stability.

A self-oscillation type resonant flyback converter includes a series combination of a primary winding and a switching transistor. A secondary winding is connected to a power diode and to an output capacitor. A feedback winding is connected to a delay driving circuit comprising a delay diode, a constant-current diode and a capacitor. The delay driving circuit is provided to delay a positive feedback signal from said feedback winding, so that when said power diode becomes non-conducting, said delay diode becomes in the reverse conduction state, starting a free resonance period that concludes when the said delay diode becomes non-conducting and the switching transistor is achieved at zero voltage switching.

A self-oscillation switching power supply including a transformer having a primary winding, a secondary winding, and a feedback winding, and further including a control winding if necessary; a switching transistor for turning on and off the current of the primary winding; a control transistor for controlling a positive feedback signal from the feedback winding or control winding to the switching transistor; and a time constant circuit which is charged by a voltage generated across the feedback winding or control winding and which supplies a control voltage to the control transistor. The self-oscillation switching power supply further comprises an electronic switch which is opened and closed in response to the positive feedback signal from the control winding or feedback winding wherein an external voltage source is connected to the time constant circuit via said electronic switch so that the charging time of the time constant circuit is varied according to an output voltage detection signal.

The invention discloses a hydraulic pulse drilling device with cavitation jet, which comprises a columnar body, wherein a fluid inlet section is provided at one end of the body, a fluid outlet section is provided at the other end of the body, and a fluid diversion portion for deviating the flow direction of the fluid, a pulse generator allowing the continuous fluid to generate pulse and a self-oscillation portion for allowing the fluid with pulse to generate resonance oscillation are sequentially provided between the fluid inlet section and fluid outlet section. The invention also discloses a self-resonating cavitation jet nozzle for drilling head, which improves the rock breaking effect of drilling head and rock cleaning effect at well bottom. The invention also discloses a hydraulic pulse drilling method with cavitation jet, which comprises during drilling work, converting continuous and stable fluid flow for impacting well bottom to pulse resonance flowing fluid; and injecting the pulse resonance flowing fluid into relatively static fluid to generate cavitation phenomena. The impact of well bottom with oscillating pressure reduces clip hold down effect, improves the rock cleaning and rock breaking capacity by jetting, and saves drilling cost.

In plural oscillation systems each of which can be described by the van der Pol equation, each oscillation system is reciprocally connected with at least one oscillation system other than the own oscillation system by a coupling factor to realize automatically the phenomenon of synchronization of the respective oscillation systems to enable spontaneous tuning of the entire system. A self-excited oscillation of an oscillation system prescribed by a van der Pol equation is controlled on / off by varying an applied voltage as a variable.

A circuit for boosting the voltage from a very low level voltage source to a higher level voltage output utilizing self-oscillation.

A method for determining isolation status of the RF repeater is provided. A modem in the repeater registers with a base transceiver station (BTS). Uplink output levels of a donor RF transceiver are calibrated and stored in the modem. The modem is synchronized to a BTS transmission received at the donor RF transceiver and the synchronization information is provided to a server RF transceiver of the repeater. Isolation detection and measurement can then be performed between donor transmit antenna and receive server antenna of the RF repeater and the automatic gain control parameter of donor RF transceiver and server RF transceiver are adjusted based upon the isolation detection and measurement value. The isolation and detection can be implemented in a co-processor coupled to the donor and server transceivers.

The invention relates to an injection locking frequency divider used in the integrated circuit of a radio receiver, belonging to the technical field of integrated circuits of radio frequency radio receivers. The injection locking frequency divider is formed by an inductance-capacitance oscillator, a tuning circuit, a signal injection circuit and a current source biasing circuit, wherein the tuning circuit comprises a numerical control capacitor array tuner and a varactor tuner. Under the condition of no external input excitation, the inductance-capacitance oscillator self-oscillates by certain frequency. The tuning circuit tunes the self-oscillating frequency through varying the load of the resonant cavity of the oscillator. The signal injection circuit injects input signals into the resonant cavity of the oscillator to realize the traction and the locking of the self-oscillating frequency of the oscillator and to further the frequency halving of the input signals. Compared with the prior art, the invention has the advantages that the circuit can realize high working frequency under low power consumption and the working frequency range is wide.

The invention discloses a jet aeration reactor for industrial or urban sewage treatment, which comprises a nozzle, a top nozzle member, a self-induced vibration mixing chamber, a lower nozzle member and short tube, wherein the air intake duct is arranged on the top nozzle member and is in communication with the induction chamber in the top nozzle member, the nozzle through-hole, the induction chamber in the top nozzle member, the self-oscillation mixing chamber, the lower nozzle member and the short tube are in communication.

A Synchronous PWM controller realized by dead-time modulation is provided for applying to the self-oscillation Royer inverter. The proposed dead-time-modulated PWM (DTM-PWM) controller is composed of a monostable circuit and a constant-current charger (CCC). The presented switching period for the buck regulation consists of a referred sawtooth having a constant-period and a dead-time. The synchronizing strategy is conducted by modulating the dead-time according to the resonant frequency of the Royer inverter. Two kinds of the control strategies in DTM-PWM controller are explored including the down-going and up-going error voltage controls. A DTM-PWM controlled dimmable Royer inverter with two-CCFL having primary-side control is designed and realized. Two kinds of the existing controllers for the Royer inverter are also experimented and compared with the proposed DTM-PWM controller. The results of the analysis and the theoretical prediction are verified with the experiments.

A driver laser for an extreme ultra violet light source device capable of suppressing self-oscillation light, amplifying a laser beam efficiently, and reducing a device size. The driver laser has an oscillator for generating a laser beam to output the generated laser beam, and at least one amplifier for amplifying the laser beam output from the oscillator to output the amplified laser beam. The amplifier includes a discharge unit which amplifies the laser beam by using energy of a laser medium excited by discharge, a feedback mirror which leads the laser beam output from the discharge unit to the discharge unit, a polarizer which leads the laser beam output from the oscillator into the discharge unit and also reflects the laser beam output from the discharge unit to a predetermined direction, and a self-oscillation light filter which attenuates self-oscillation light output from the discharge unit.

The invention provides a design method for a sliding mode disturbance observer used for servo system control, and aims at the friction interference problem in low speed of a servo system and considers the error and uncertainty problem of system modeling. A common DC motor model is used, and a disturbance observer and sliding model variable structure control are combined so that the sliding mode disturbance observer is designed. Firstly the size of the friction torque is observed by using the disturbance observer, and then a sliding mode controller is designed according to the obtained friction torque. The switching item gain of the sliding mode controller can be reduced through observation of friction torque so that the buffeting phenomenon can be reduced. Suppression of the low speed servo system for dead zone, creeping, self-oscillation and other nonlinear phenomena can be realized through the sliding mode disturbance observer so that the requirements for the modeling precision can be reduced and the method has great robustness.

A robot apparatus having a plurality of movable sections includes a motion control section that generates a control signal for the periodic motion of at least part of the movable sections according to the output of an oscillator showing self-oscillation and entrainment characteristics, an environment measuring section that measures the motion according to the control signal for the movable sections or the physical environment at the time of the motion of the movable sections, a periodic oscillator control section that inputs a periodic signal to the oscillator as feedback according to the outcome of the measurement by the environment measuring section and generates an entrainment phenomenon and a non-periodic oscillator control section that inputs a non-periodic or temporary feedback signal to the oscillator.

The invention discloses a high-pressure self-oscillation oscillating impulse jet flow nozzle with continuous adjustable cavity length. The high-pressure self-oscillation oscillating impulse jet flow nozzle comprises an inlet nozzle, an adjusting ring, a base and an outlet nozzle, wherein the base is an inner hollow cylinder; the inner cavity of the cylinder is a cylindrical oscillating cavity; the upper end of the inlet nozzle is connected with a high-pressure pipe by external threads arranged on the cylindrical face of the end part of the upper end; the middle of the inlet nozzle is spirally connected with inner ring threads of the adjusting ring by external threads arranged on the outer cylindrical face of the middle; the lower end of the inlet nozzle is spirally screwed into the oscillating cavity of the base; the base is fixedly connected with the adjusting ring and the outlet nozzle respectively by screws, through holes formed in the upper and lower bottom faces of the base, a through hole formed in the adjusting ring and a through hole formed in the outlet nozzle. The high-pressure self-oscillation oscillating impulse jet flow nozzle with the continuous adjustable cavity length has the advantages that aiming at different working pressures, the cavity length of the oscillating cavity can be continuously adjusted by rotating the base, and thus the continuous jet flow is changed into strong impulse jet flow; each part of the nozzle is easily processed, and the replacement is convenient.

A low power plasma generator is provided which can be fabricated in micro-miniature size and which is capable of efficient portable operation. The plasma generator comprises a microwave stripline high Q resonant ring, which may be circular or non-circular, disposed on a dielectric substrate and having a discharge gap in the plane of the substrate. The resonant ring is one-half wavelength in circumference at the operating frequency and is matched to the impedance of the microwave power supply. The voltages at the resonator ends at the gap are 180° out of phase and create an intense electric field in the gap, and a resultant discharge across the gap. The discharge is non-thermal and operates near room temperature and has an intense optical emission. The generator is well suited for low power portable and other applications and can be readily fabricated by known microcircuit techniques. Alternatively, the gap of the resonant ring can extend through the substrate and in which the discharge is formed. A bias coil can be coupled to the ring to provide a bias voltage to the plasma. A feedback path can be provided for self oscillation and closed loop frequency control.

The invention relates to an optimized cesium-light-pump weak magnetic detection device. In the optimized cesium-light-pump weak magnetic detection device, a non-magnetic-effect thermostatic controller enables a cesium spectrum lamp and a cesium sample absorbing bulb to be in the constant-temperature steam state, a radio frequency source stimulates the cesium spectrum lamp to emit light, and the light is converted into left handed circular polarization light to illuminate the cesium sample absorbing bulb, and focused on a photoelectric detector through a convex lens; a magnetoresistive sensor magnetic measuring module assists in measuring the value of a geomagnetic field of the position where the device is located, the range of strength is judged through an embedded type processing terminal module, and a self-oscillation module is controlled in a segmentation mode; photomagnetic resonance signals of the cesium sample absorbing bulb are detected by a low-noise photoelectric conversion circuit and simulate a high-frequency coil on the cesium sample absorbing bulb after being amplified and dephased so as to constitute a self-oscillation circuit, and Larmor signals are output; a Larmor signal measuring module and a big-dipper / GPS locating module are used for accurately measuring the value of the geomagnetic field of the position where the device is located. According to the optimized cesium-light-pump weak magnetic detection device, by means of the method achieving auxiliary magnetic field measurement, subband control, accurate frequency measurement and dual-mode locating, detection accuracy and reliability of the device are guaranteed.

The invention relates to an out-of-plane frequency method for testing the cable force of a planar cable rod system, which discloses an out-of-plane frequency method based on the cable force of a pulling cable of an out-of-plane self-oscillation frequency testing planar cable rod system and belongs to the fields of cable force monitoring, state (parameter) identification, health monitoring and the like of the construction phase and the use phase of a cable structure. The method is based on the cable force of the pulling cable of the out-of-plane self-oscillation frequency testing planar cable rod system, and continuous short cables in the planar cable rod system are converted into an out-of-plane long cable, the cable force is determined by measuring the out-of-plane self-oscillation frequency and establishing a cable force-out-of-plane self-oscillation frequency relation formula, and the method concretely comprises the following steps of: 1. carrying out the modal analysis of the finite element model of the planar cable rod system, and determining the out-of-plane calculated length; 2. measuring the out-of-plane self-oscillation frequency of the planar cable rod system; 3. identifying the out-of-plane bending rigidity according to the measured multistage out-of-plane self-oscillation frequency; 4. establishing the cable force-out-of-plane self-oscillation frequency relation formula; and 5. calculating the cable force.

A self-oscillation switching power supply apparatus of the ringing choke converter type comprises a transformer T including a primary winding N1, a secondary winding N2, and a feedback winding NB; a switching transistor Q1 which oscillates in a self-oscillating fashion in response to a feedback signal from the feedback winding NB thereby turning on and off the current flowing through the primary winding; a rectifying and smoothing circuit connected to the secondary winding; an oscillation frequency control circuit including a control transistor Q3 for controlling a control signal input to the switching transistor Q1 thereby controlling the control transistor Q3 so as to extend the off-time in the self-oscillation period of the switching transistor Q1; and an oscillation frequency control disabling circuit for disabling the control of the control transistor Q3 in accordance with a remote signal.

The present invention includes a detection coil (4) in a self-oscillation circuit (10) in a position detection device. The oscillation frequency of the self-oscillation circuit (10), which is configured from the coil (4) and a capacitor, is set to a high frequency band (for example, around 1 MHz or higher). A target section (3) of which the relative position with respect to the coil (4) changes in accordance with the displacement of a detection subject comprises a magnetically responsive member configured in a manner so as to change the inductance of the coil (4) in accordance with the relative position. A rectifier circuit (21) extracts the amplitude level of the oscillation output signal of the self-oscillation circuit (10) and outputs the result as position data of the detection subject. As an example, a plurality of self-oscillation circuits (10a, 10b) are provided. As a separate example, a single self-oscillation circuit (10) forms a plurality of series circuits by, for every pair of a plurality of coil pairs, connecting in series the two coils (4a, 4b) configuring the coil pair, and includes the result of connecting the series circuits in parallel as an inductor element for self-oscillation.

The invention relates to a self-oscillation pulsed liquid-gas jet pump. The jet pump comprises an upper nozzle, a self-oscillation cavity, a collision body, a lower nozzle, a suction chamber, a throat pipe and a diffusion tube, wherein the upper nozzle, the self-oscillation cavity, the collision body and the lower nozzle are connected sequentially to form a self-oscillation pulsed jet nozzle; after passing through the self-oscillation pulsed jet nozzle, a main jet flow of high-pressure liquid is modulated into a pulsed jet flow and enters the suction chamber of a liquid-gas jet pump; and gas is introduced under the action of jet turbulent diffusion, and boosted and exhausted through the diffusion tube after mixing and energy exchange in the throat pipe. The self-oscillation pulsed liquid-gas jet pump has the advantages that the self-oscillation pulsed jet nozzle and the liquid-gas jet pump are combined, and the main jet flow is changed into pulsed jet flow through the self-oscillation pulsed jet nozzle, so that the mass transfer capability of the main jet flow is improved, and the efficiency of the liquid-gas jet pump is improved. The device is not provided with a motion part, simple in structure and reliable in operation, and is suitable for waste gas absorption and treatment, oil and gas exploitation, vacuumization, aeration and other application situations.

The invention relates to a multifunctional self-oscillation jet drill bit. The prior similar product not only has shallow drilling depth and complex structure but also has large resistance loss and short service life of a drill bit, can not repeatedly switch drilling and groove cutting during the drilling process, and limits the application scope. A crushing blade and a valve body are arranged inside a cutting head body of the drill bit; a first offsetting spring in the valve body is matched with a valve core A in the form of sliding; a valve core B is matched with a second offsetting spring for operation under the action of a lined ring, a washer and the valve body together; and the valve core and a limber hole of the valve body are matched for use with a self-oscillation nozzle. The multifunctional self-oscillation jet drill bit adopts high-pressure water as power to realize repeated switching between drilling and groove cutting of coal seam and terrane, not only has a simple structure and is flexible to switch but also can promote development of coal seam fissure through oscillation jet generated by the nozzle, strengthens the permeability of the coal seam, improves the gas extraction rate, particularly has obvious effect on low-permeability coal seam, and widely promotes and applies the fluid technology of the high-pressure water in the fields of drilling and gas extraction of the low-permeability coal seam.

A vessel pulse wave measurement system performs vessel pulse wave measurement using an optical probe circuit provided with an optical probe including a light emitting element and a light receiving element, a drive circuit, and a detection circuit. A measurement device directly and synchronously feeds back an electrical signal from the optical probe to the drive circuit as a drive signal to generate a self-oscillation signal from the detection circuit, and measures the self-oscillation signal as a vessel pulse wave signal. A controller controls an operating point of at least one of the detection circuit and the drive circuit such that the self-oscillation signal substantially reaches a maximum level thereof.

The present invention relates to a piezoelectric power converter comprising an input driver electrically coupled directly to an input or primary electrode of the piezoelectric transformer without any intervening series or parallel inductor. A feedback loop is operatively coupled between an output voltage of the piezoelectric transformer and the input driver to provide a self-oscillation loop around a primary section of the piezoelectric transformer oscillating at an excitation frequency. Electrical characteristics of the feedback loop are configured to set the excitation frequency of the self-oscillation loop within a zero-voltage-switching (ZVS) operation range of the piezoelectric transformer.

A self-detection transducer of self-excitation oscillation on resonant micro-cantilever beam is prepared for forming closed loop circuit by series-connecting frequency-selection network, filter amplification circuit, phase compensation circuit with driving circuit; forming frequency-selection network by micro-cantilever beam, compensation circuit, operation- amplification circuit, the first and the second feedback circuits; connecting bottom electrode to negative input end of operation amplification circuit and top electrode to positive input end of operation amplification circuit through compensation circuit.