91results about How to "Reduce parameter requirements" patented technology

The invention provides a circuit and a method for switch power supply feedback voltage detection and sampling and holding. The circuit provided by the invention comprises a clock control circuit, a control sampling clock, a sampling and holding circuit, a waiting state control circuit, a learning state control circuit, an increment control circuit, a system control circuit and a delay circuit, wherein the sampling and holding circuit samples an input voltage at different time in two paths and selects a larger value to be output; the waiting state control circuit controls sampling and waits till a waveform is stable; the learning state control circuit controls the time sequence of a learning state; the increment control circuit controls an increment circuit which realizes two adjacent times of sampling; the system control circuit controls a finite state machine together with other circuits; and the delay circuit realizes required delay. In the method of the invention, an entire switching period of a switch power supply is divided into five states in turn: a PWM open state, a waiting state, a learning state, a detection state and a demagnetization ending state; the five states form the finite state machine; and the detection and sampling and holding of a feedback voltage can be realized by controlling the state switching and output of the finite state machine.

The invention is suitable for the technology of electronic devices, and provides an intelligent power module and a manufacturing method thereof. The intelligent power module comprises a metal substrate of which one surface is covered with an insulating layer; a circuit wiring layer which is formed on the surface of the insulating layer; multiple IGBT tubes which are arranged on the preset positions of the circuit wiring layer; gate electrode drive tubes which are identical with the IGBT tubes in number, wherein each gate electrode drive tube respectively acts as a drive circuit for the corresponding IGBT tube, and the drive end of each gate electrode drive tube is the same with wiring length of gate electrode electric connection of the IGBT tubes; and a metal wire which is connected between the circuit wiring layer, the IGBT tubes and the gate electrode drive tubes so that a preset circuit is formed. Wiring from the gate electrode drive tubes to the IGBT tube gate electrodes is ensured to be identical so that dynamic characteristics of the IGBT tubes are enabled to be identical without additional arrangement of wiring of the intelligent power module.

The invention discloses a laser-induced fluorescence combustion field parameter measuring device which comprises a light source system and a detection system, wherein the light source system comprises a laser (5), an optical fiber coupling lens (1), a plastic optical fiber bundle (2), a spherical lens (3) and a cylindrical lens (4), wherein the optical fiber coupling lens (1), the plastic optical fiber bundle (2), the spherical lens (3) and the cylindrical lens (4) are arranged in the laser transmission direction in sequence; an optical fiber configuration section on the incident end surface of the plastic optical fiber bundle (2) is matched with a light beam section of the laser (5), and the emergent end surface of the plastic optical fiber bundle (2) is configured into a linear shape; and a cylindrical center line of the cylindrical lens (4) is parallel to an optical fiber configuration line on the emergent end surface of the plastic optical fiber bundle (2). The laser-induced fluorescence combustion field parameter measuring device has the benefits that a lamellar light beam with uniform light intensity in an area on the light beam transmission direction is realized, the demands that the combustion flow field two-dimensional parameter measurement is realized by adopting a planar laser-induced technology are satisfied, the combustion flow field parameter measurement under the strong-vibration and strong-noise impact environment are simultaneously satisfied, and the environmental adaptability of the system is improved.

The invention relates to the field of kitchen appliances, and discloses a control method for a range hood, a controller, a control device and the range hood. The temperature, detected in a time window, of a furnace end region of a gas stove is acquired, the temperature fluctuation level in the time window is determined according to the acquired temperature, finally, starting of the range hood is determined according to the temperature fluctuation level, thus, ignition of the gas stove can be accurately recognized, and automatic control over the range hood is achieved. By the adoption of the method, the parameter requirement on an infrared sensor is low, the single-point acquisition low-cost infrared temperature sensor can be adopted, the response speed can be rapidly recognized, good recognition accuracy is achieved, and therefore the reliability and the accuracy of linkage control of the range hood and the gas stove at low cost are achieved.

The invention discloses a transducer drive induction motor stator turn-to-turn short circuit fault diagnosis method; the method calculation is simple, easy to realize and has high robustness, the parameter requirement to the induction motor is low. A voltage sensor is added, the transducer switch sideband harmonic wave zero-sequence component is extracted and analyzed for detecting the fault of the ring opening and closing operation and speed regulation operation for the motor system, the method is suitable for the modulation modes as SPWM, SVPWM, the application range is wide, the dynamic effect is good, the recognition precision is high, the stator turn-to-turn short circuit fault can be diagnosed at real time for giving the fault degree index.

The invention discloses a method for comprehensively analyzing transient thermoelectric characteristics of a core of a general thermionic space nuclear reactor. The method mainly includes the following steps: 1. determining a core structure and initial parameters of the thermionic space nuclear reactor; 2. calculating the temperature distribution of the core of the thermionic space nuclear reactorat the current moment; 3. calculating the potential and current distribution on a core electrode at the current moment; 4. calculating the core output voltage, output current and output electric power at the current moment; and 5. jumping to step 2 for calculation at the next moment according to all known conditions, and circularly calculating until reaching a stable state. The method can calculate the transient thermoelectric characteristics of a power supply of the general thermionic space nuclear reactor, and can obtain a more accurate calculation result during calculation.

The invention relates to a dust collecting type negative pressure dust suction machine. The dust collecting type negative pressure dust suction machine comprises a machine box, and the upper side and the lower side of the machine box are provided with an air guide opening and an air outlet correspondingly. A barrel-shaped filter element is detachably arranged inside the machine box and corresponds to the air guide opening, and an air inlet channel is formed by the barrel-shaped filter element and the air guide opening. The bottom of the barrel-shaped filter element is provided with a dust receiving device corresponding to the barrel-shaped filter element. The dust receiving device is detachably suspended in the machine box. An exhaust fan is arranged below the dust receiving device. Due to the arrangement of the barrel-shaped filter element, filtered dust can fall down freely, and meanwhile the bottom of the barrel-shaped filter element is provided with the dust receiving device so as to achieve dust gathering, so that the service life of the barrel-shaped filter element is prolonged, and the filtering effect is improved. A dust patting device is arranged above the dust receiving device, the dust patting device pats a filter screen on the barrel-shaped filter element so as to remove dust adsorbed on the filter screen in a patting mode, and therefore the situation that the filter screen is blocked by dust is reduced, and the service life of the barrel-shaped filter element is prolonged.

The invention relates to a direct-current booster circuit suitable for micro power inversion, which comprises two symmetrical push-pull circuits, a rectifier and filter circuit and a PWM generating and voltage stabilizing control circuit. Output results of the two symmetrical push-pull circuits are superposed to generate 380V alternating current; the rectifier and filter circuit rectifies and filters the 380V alternating current to generate 330V direct current; and a second resistor (R2) and a third resistor (R3) in the PWM generating and voltage stabilizing control circuit perform voltage partition on the 330V direct current generated by the rectifier and filter circuit, the partial voltage is compared with a reference voltage stabilized by a voltage stabilizing tube (D1) through a comparator (U1) to output high and low levels, the high and low levels are added to the reverse input end of a differential amplifier (U3) of a PWM controller (U2) through a diode (D2) and an optical coupler (U4), and the stable reference voltage is connected to the positive input end of the differential amplifier (U3). The circuit of the invention has the advantages of simple structure, high conversion efficiency by adopting a booster mode of superposing two groups of push-pull circuits compared with a common fly-back circuit, low parameter requirement for devices and lower production cost.

The invention discloses a method for preparing biodiesel from oil with a high acid value. The method comprises the steps as follows: mixing oil with a high acid value with methanol, adding compound acid catalyst, carrying out esterification reaction, removing crude methanol through flash vaporization, adding potassium hydroxide methanol solution, performing transesterification reaction, removing crude methanol through flash vaporization again, standing liquid from which crude methanol is removed and settling for 4 to 5 hours, and removing glycerol through separation to obtain crude biodiesel.The method has the characteristics of low device investment, simple process, low manufacturing cost, high reaction rate and high conversion rate of products.

The invention relates to a frequency-offset compensation module and method applied to a DQPSK (differential quadrature reference phase shift keying) system. According to the method, each set of vector signal data is calculated by phase amplification and normalization during compensation so as to obtain unit frequency-offset phase shift; N pieces of phase data are averaged and divided by four so as to obtain residual unit frequency-offset phase shift; residual frequency offset and pre-compensation frequency offset are added together and multiplied by respective numbers of the N pieces of data, and respective frequency-offset phase values are obtained; an original phase value obtained before pre-compensation is subtracted by frequency-offset phase obtained after phase-offset phase calculation, and frequency-offset phase compensation is achieved. The frequency-offset compensation module and method has the advantages that the compensation process needs control of a laser, system stability is enhanced, the system is easier to implement, and cost is lowered.

The invention relates to an efficient white smoke removing device for flue gas after WFGD (wet flue gas desulfurization) and an implementation method of the device, and belongs to the technical fieldof chemical engineering and environmental protection. The device comprises a booster fan, a white smoke removing tower and a cooling tower, wherein an inlet of the booster fan is connected with a fluegas guide pipe; an outlet of the booster fan is connected with a flue gas inlet of the white smoke removing tower; a spraying layer and a surface air cooler are arranged in the white smoke removing tower; a chimney is arranged at the top end of the white smoke removing tower; a solution tank is connected with the bottom of the white smoke removing tower; the spraying layer is connected with the solution tank; the solution tank is connected with a solution pump B, and then a solution flows to an inlet of a generator; an outlet of the generator is connected with a heat exchanger and then is connected with the solution tank; a water outlet of the heat exchanger is connected with an inlet of the cooling tower; a water inlet of the heat exchanger is connected with an outlet of the cooling tower; the inlet of the cooling tower is connected with an outlet of the surface air cooler; the outlet of the cooling tower is connected with an inlet of the surface air cooler. According to the efficient white smoke removing device for flue gas after WFGD and the implementation method of the device, flue gas is efficiently dehumidified by a LiBr solution, so that when the flue gas moves to an outletof the chimney, no white smoke is produced.

The invention discloses a high voltage piezoelectric ceramic driving power source and a control method thereof, belonging to the technical field of driving power sources. The high voltage piezoelectric ceramic driving power source comprises a phase shifting parallel circuit unit, a control input, a power supply input end and a power supply output end; the phase shifting parallel circuit unit regulates the direct voltage signal input by the power supply input end according to an SPWM wave inputted by the control input end and generates continuous sine wave signals with an adjustable frequency and an adjustable amplitude at the power supply output end so as to drive the piezoelectric ceramic to generate micrometric displacement; and the phase shifting parallel circuit unit comprises multi-channel phase-shifting parallel circuit modules which are connected in series and used for increasing the output voltage. The method comprises the steps of: regulating the amplitude and the frequency ofthe output signal according to the SPWM signal and the direct current signal. The driving power supply is high in output voltage, large in driving current, high in output power and fast in frequencyresponse.

The invention discloses a retrieval structure of an optical packet head used in an exchange network of an asynchronous optical packet, which comprises a light splitter, a reflective semiconductor amplifier, a first circulator, a second circulator and a coupler; an input terminal of the light splitter is connected with packet input waveguide; a first output terminal of the light splitter is connected with a d port of the second circular through fiber delay lines, so that control signals which pass through the light splitter and are delayed are inputted to the reflective semiconductor amplifier; a second output terminal of the light splitter is connected with an a port of the first circulator; a b port of the first circulator is connected with the input / output terminal of the reflective semiconductor amplifier; a c port of the first circulator is connected with a first input terminal of the coupler; the input / output terminal of the reflective semiconductor amplifier is connected with an e port of the second circulator; an f port of the second circulator is connected with a second input terminal of the coupler. The retrieval structure of the optical packet head can increase on-off ratio of a system.

The invention discloses a method of measuring secondary cable transfer impedance caused by ground net impact current, comprising accessing an impulse t voltage generator in a transformer station ground net, laying a secondary cable, and using standard impact voltage and current waveforms to inject current into the current ground entry point of the ground net, and to extract current at a current discharge point; employing an oscilloscope to measure the output current waveform of the impulse voltage generator; employing the oscilloscope to measure the potential difference between core wires at any end of the laid secondary cable, and the potential difference between the core wires at the end and the ground net; respectively using 2 to divide the two measured potential differences; and respectively comparing the peak values of the two obtained potential differences with the output current peak values of the impulse voltage generator. The measurement method of the invention can obtain the transfer impedance between core wires of the secondary cable, and the transfer impedance between the core wires and the ground net to be used for assessing grounding system impact characteristics, and guiding grounding engineer construction.

The invention discloses an optical coherence tomography depth reconstruction method based on deep learning. The method comprises the following steps: 1) preparing a training sample which comprises interference signal data and corresponding real depth data; 2) training a neural network to learn a mapping relationship between an interference signal and a real depth; 3) obtaining an interference signal of a to-be-reconstructed depth and performing depth reconstruction by using the model. According to the invention, deep learning is used to realize deep reconstruction (not a Fourier transform method) of an interference signal acquired in an optical coherence tomography process; the depth reconstruction resolution can be not limited by the central wavelength or spectral width of a light source,no special requirement is needed for the smoothness of a spectral envelope, and an interference signal can be obtained through a simplified SD-OCT method of removing a reference arm.

The invention relates to a separation structure of optical packet heads and payload used in an asynchronous optical packet switching network, and is characterized in that: the structure comprises an optical power splitter and a second multimode interference coupler; an upper output port of the optical power splitter is connected with a first multimode interference coupler and the upper output port of the optical power splitter is connected with an input end of the first multimode interference coupler; a lower output port of the optical power splitter is connected with the other input end of the first multimode interference coupler through an optical fiber delay line; an output end of the first multimode interference coupler is connected with an input end of the second multimode interference coupler through a first semiconductor optical amplifier; the other output end of the first multimode interference coupler is connected with the other input end of the second multimode interference coupler through a second semiconductor optical amplifier; detection optical packet heads are outputted from a lower output port of the second multimode interference coupler; the detection optical payload is outputted from an upper output port of the second multimode interference coupler.

The invention provides a circuit and a method for switch power supply feedback voltage detection and sampling and holding. The circuit provided by the invention comprises a clock control circuit, a control sampling clock, a sampling and holding circuit, a waiting state control circuit, a learning state control circuit, an increment control circuit, a system control circuit and a delay circuit, wherein the sampling and holding circuit samples an input voltage at different time in two paths and selects a larger value to be output; the waiting state control circuit controls sampling and waits till a waveform is stable; the learning state control circuit controls the time sequence of a learning state; the increment control circuit controls an increment circuit which realizes two adjacent times of sampling; the system control circuit controls a finite state machine together with other circuits; and the delay circuit realizes required delay. In the method of the invention, an entire switching period of a switch power supply is divided into five states in turn: a PWM open state, a waiting state, a learning state, a detection state and a demagnetization ending state; the five states form the finite state machine; and the detection and sampling and holding of a feedback voltage can be realized by controlling the state switching and output of the finite state machine.

The embodiment of the invention is suitable for power distribution field, and provides an electric servo transformer and a servo system thereof. In the electric servo transformer, the input terminal is connected to a three-phase alternating current; an output terminal is connected with a servo unit. The servo transformer is characterized in that the input terminal of the electric servo transformer is connected with a bridge stack set composed of at least two rectifying elements, and the three-phase alternating current is inputted into the electric servo transformer and outputted into the servo unit after rectifying by the bridge stack set. The circuit of the electric servo transformer is simple, and the electric servo transformer has the advantage of low request to element parameter, easy implementation, low cost, low failure rate, easy maintenance and the like; the performance of resisting lightning stroke and high voltage great current is more excellent, and the protective capability is strong.

The invention is suitable for the technical field of medical signal processing, and provides a method for eliminating an interference side lobe signal, a system thereof and a blood cell analyzer. The method comprises the following steps: receiving a diffusion light signal obtained through irradiating a cell by laser, converting the diffusion light signal into a digital signal, and acquiring the signal characteristic information in the digital signal; searching the interference side lobe signal in the digital signal according to the signal characteristic information; and rejecting the interference side lobe signal in the digital signal. The interference side lobe signal is eliminated without improving optical element parameters when an optical diffusion process is used to identify cells, such as a platelet cell, so requirements on the optical element parameters are reduced, thereby the material cost is reduced, and the accuracy of the cell identification using the optical diffusion process is improved.

The invention provides a time sequence control system and electronic equipment. The system comprises a power supply module, a control module, an energy storage module and a plurality of comparison modules, wherein the control module is connected to the input end of the energy storage module and the power supply module and used for controlling whether the power supply module outputs preset voltageto the energy storage module or not so that the voltage of the output end of the energy storage module can be gradually increased or decreased; the first input end of each comparison module is connected with the output end of the energy storage module, and the second input end of each comparison module is connected with different second input voltages; each comparison module outputs a first enablesignal under the condition that the first input voltage and the second input voltage meet a first preset voltage relation, and outputs a second enable signal under the condition that the first inputvoltage and the second input voltage meet a second preset voltage relation; the electronic equipment comprises the system, a plurality of power supply chips and a plurality of load devices. The time sequence control system can completely control the time sequence and the interval of the enable signals, and is high in universality.

The invention designs a space charge density measuring apparatus. The invention combines the advantages of an ion counting method and a charge screening method, and can realize the accurate measurement of the charge density in the wide particle size range under the condition that the parameters of the measuring device are low in requirement and the size is small. The apparatus comprises a shielding layer, an insulating layer, an ion counting method sensor, a charge screening method sensor, a flowmeter, an ion counting method bias power supply, a negative ion weak current measurement module, a positive ion weak current measurement module, a charge measurement module, a measurement result processing module and a gas intake device.

The invention provides a constant current direct-driven type LED switching power supply comprising a rectifier bridge, and LED strings which are connected between the positive and negative electrodes of the rectifier bridge. The constant current direct-driven type LED switching power supply also comprises a current sampling resistor which is used for acquiring current signals of the LED strings, an NMOS transistor which is connected among the LEDs, a freewheeling diode which is connected on the D and s of the NMOS transistor, a totem-pole circuit which is formed by a first NPN transistor and a first PNP transistor, a biasing resistor of the first NPN transistor, and a Schmitt circuit which is formed by the first NPN transistor and a second NPN transistor. The switching power supply is low in loss and can be modularized and integrated on chips.

The invention discloses a T-type conversion circuit and a corresponding three-phase conversion circuit and a conversion device. In the T-type conversion circuit, by adding an inductor, four diodes andtwo capacitors in a T-type conversion circuit in the prior art, a controllable switching device and a diode device of the T-type conversion circuit can realize soft switching, and the power consumption of power devices and diode devices is reduced. The conversion device adopting the above-mentioned T-type conversion circuit combines components in the prior art with the newly-added components in the technical scheme by setting a first circuit module and a second circuit module, so that in a case that the internal circuit layout of the inverter / rectifier is not changed, the reconstruction costis greatly reduced, the topological structure is compact, and the busbar design is simple, which is extremely advantageous for electrical layout and structural design.

The invention provides a dual buck converter of a pre-posed buck current-doubling circuit. The converter comprises a buck current-rising circuit and a dual-buck circuit. A first output terminal of the buck current-rising circuit is connected to a first input terminal of the dual-buck circuit; a second output terminal of the buck current-rising circuit is connected to a second input terminal of the dual-buck circuit; and thus the buck and current rising processing is carried out on an input voltage in advance by using the buck current-rising circuit and then the processed voltage is transmitted to the input terminal of the dual-buck circuit. According to the invention, the structure is simple; the operation is convenient; and the buck effect is obvious. Moreover, the circuit structure is easy to extend; A plurality of units are connected in parallel in front of the dual-buck circuit and thus the buck processing is carried out on the input voltage, wherein each unit is formed by one electrolytic capacitor and three power diodes.

The invention relates to a production method of 3-methylthiophene and equipment thereof, and the production method comprises the following steps: sulfur is fed into a liquefier and liquefied, fed into a vaporizer II, vaporized, and fed the vaporized sulfur and vaporized isoprene into a mixer according to a ratio, a mixture is fully vaporized and mixed, the mixed gas is fed into a normal pressure tubular reactor filled with a catalyst, and synthesized to generate a 3-methylthiophene crude product; after the 3-methylthiophene crude product is discharged from the reactor, the trimethylthiophene crude product is cooled to below 80 DEG C through a cooler I, hydrogen sulfide gas is separated through a separator, and the hydrogen sulfide gas enters an alkali absorption tower to be absorbed; the trimethylthiophene from which the hydrogen sulfide gas is separated enters a rectifying tower to be refined, and after a certain reflux ratio is controlled, the tower top produced liquid is analyzed to be qualified, and is produced to enter a qualified product tank. The production method has the remarkable characteristics of simple process, safety and environmental protection.

The invention discloses a T-shaped rectifying circuit and a corresponding three-phase rectifying circuit, By utilizing an internal circuit topology, A first controllable switch and a second controllable switch are both soft-switched. Namely, zero voltage switch, zero current switch or zero voltage zero current switch, or on-off switch with limited dv / dt and di / dt, which reduces the on-off power consumption of controllable switch, and makes the on-off power consumption of T-type rectifier circuit can be very small when the working frequency is relatively high, so that the on-off power consumption of T-type rectifier circuit is very low. In addition, the present application builds on conventional T-type rectifying circuits, Only one inductor is added, Four diodes and two capacitors do not require additional controllable switches and control circuits, and devices can be added without substantially changing the internal circuit layout of the traditional T-type rectifier circuit, so that the circuit topology structure is compact and the bus bar design is simple, thereby facilitating the electrical layout and structure design, and reducing the reconstruction cost.

The invention discloses regenerated UHPC cement concrete and a preparation method thereof, and belongs to the field of building materials. The concrete comprises the following components in parts by weight: 100 parts of recycled UHPC cement, 35-40 parts of water, 180-220 parts of fine aggregate, 280-350 parts of coarse aggregate and 0.5-0.8 part of a water reducing agent. The regenerated UHPC cement concrete is prepared by crushing, screening, grinding and chemically exciting and stirring waste UHPC, and the recycled UHPC cement concrete can be prepared by sequentially adding the raw materialsinto a stirrer according to the components and parts by weight of the concrete, stirring and curing. According to the preparation method, waste is changed into valuables, through the steps, the wasteultra-high performance concrete is processed into regenerated cement which can be reused, the use amount of ordinary Portland cement can be reduced, the environmental problem caused by the waste ultra-high performance concrete can be solved, and reasonable utilization of resources is achieved.

The invention discloses a volume-adjustable isolation oil cylinder, and belongs to the technical field of hydraulic systems. The oil cylinder comprises a cylinder bottom, a first in-place induction mechanism, a second in-place induction mechanism, a supporting sleeve, a second spring, a cylinder barrel, a piston, a volume adjusting assembly and an end cover; the cylinder bottom is arranged at oneend of the cylinder barrel, the volume adjusting assembly and the end cover are arranged at the other end of the cylinder barrel, the supporting sleeve is located in the cylinder barrel, the piston isarranged in the cylinder barrel, the supporting sleeve is sleeved with the second spring, the first in-place induction mechanism is arranged on the cylinder bottom and in the supporting sleeve, whenthe piston moves to be in place in the cylinder bottom direction, the first in-place induction mechanism is triggered, the second in-place induction mechanism is arranged on the volume adjusting assembly and the piston, and when the piston moves to be in place in the direction of the end cover, the second in-place induction mechanism is triggered; according to the oil cylinder, hydraulic oil in ahydraulic pipeline of an in-cabin hydraulic system and hydraulic oil in a hydraulic pipeline of an out-cabin hydraulic execution part are isolated, and the exterior liquid is prevented from being brought into a hydraulic oil tank of the hydraulic system.