41results about How to "Extended dead time" patented technology

A power converter employing a controller configured to increase a dead time between conduction periods of first and second power switches therein and method of operating the same. In one embodiment, the power converter includes first and second power switches coupled to an input thereof, and a sensor configured to provide a sensed signal representative of at least one of a current level and a power level of the power converter. The power converter also includes a controller configured to increase a dead time between conduction periods of the first and second power switches when the sensed signal indicates a decrease of at least one of the current level and the power level of the power converter.

To provide a DC-DC converter allowing miniaturization of a voltage transformer without fear of reducing conversion efficiency due to saturation of the transformer and allowing enhancement of conversion efficiency by suppressing switching loss. An LC resonance circuit 3 is inserted on the secondary side of a transformer 1. When driving means 4 alternately turn on and off a pair of switching means 2-1, 2-2, an output is obtained on the secondary side via the transformer 1. A current transformer 5 for current detection, a current value detection portion 6 and a current value comparison portion 7 detect a difference between each resonance current value per half cycle due to the operation of the LC resonance circuit 3. In response to its result, the drive means 4 regulate automatically on-state duty ratio of the switching means 2-1, 2-2 so as to align the resonance current values per half cycle.

To provide a DC-DC converter capable of suppressing switching loss with a simple structure, and capable of enhancing converting efficiency. An LC resonant circuit 3 is inserted on a secondary side of a transformer 1. If switching means 2 is turned ON or OFF by driving means 4, output can be obtained on the secondary side through the transformer 1. A resonant current frequency detecting means comprises a current detecting current transformer 5 and a frequency detecting unit 6. The resonant current frequency detecting means detects resonant current frequency caused by operation of the LC resonant circuit 3. This frequency is fed back to the driving means. As a result, the driving means 4 turns the switching means 2 ON or OFF at a frequency corresponding to the resonant frequency of the LC resonant circuit 3.

The invention allows DC power supply systems efficiently accommodate each other for electric power, with a simple control system with no fear of a large current flowing a switching element at turning on / off, with less switching loss.A rectification element is connected parallel to each of switching elements 4-1 to 4-4 of a low-voltage side switching part 4, while a rectification element is connected parallel to each of switching elements 5-1 to 5-4 of a high-voltage side switching part 5. By performing switching control either or both of the low-voltage side switching part 4 and the high-voltage side switching part 5 at the same time, an electric power is traded between DC power sources through a transformer 3. An LC resonance circuit 6 is provided between a high-voltage side coil 3-2 of the transformer 3 and the high-voltage side switching part 5, or between a low-voltage side coil 3-1 of the transformer 3 and the low-voltage side switching part 4, so that the current flowing a primary side and secondary side is made to be sine wave, for switching near its zero crossing point.

The invention provides a comprehensive utilization method of pig manure on the basis of carbonization pyrolysis technology. Through steps including multi-stage drying to the pig manure, carbonization pyrolysis to the pig manure, flue gas treatment and the like, the pig manure is subjected to dry pyrolysis in a furnace, high-temperature pyrolysis gasification, and re-pyrolysis gasification to flue gas (outlet flue gas temperature is higher than 850 DEG C), wherein retention time of flue gas in the furnace is prolonged to more than 2 sec. In the whole pyrolysis process, generation of PCDDs / PCDFs harmful substances is effectively inhibited. Through quenching cooling to high-temperature flue gas, re-synthesis of dioxin is effectively avoided. Main measurements, such as a desulfurization column, adsorption in a smoke removal column, liquefaction in a condenser and the like, are all employed in the technology, so that national smoke and dust discharge standard at present can be satisfied.

The invention discloses a C80 autoclaving-free concrete pole production technology which comprises the following steps of: (1) mixing materials, namely uniformly stirring components of concrete by a secondary stirring mode; (2) forming, namely pouring the mixed material mixed to a pole steel mould for centrifugal shaping, and meanwhile sampling and preparing a test block; (3) performing steam maintenance, namely placing the pole and the test block to a maintenance pool for constant pressure steam maintenance; and (4) detecting, namely demoulding the test block and detecting one-day strength and seven-day strength, respectively. According to the C80 autoclaving-free concrete pole production technology provided by the invention, the autoclaving link of concrete can be omitted in the production process of high strength poles, so that energy consumption can be reduced. Autoclaving is omitted, so that concrete is prevented from being damaged by autoclaving, and the product durability is ensured. The technology can be further widely applied to tubular pipe production and has god economical and social benefits as well as good popularization prospect.

A switching power supply includes an insulated transformer, a full-bridge circuit which converts input DC power into AC power and outputs the AC power to a primary-side coil, an output circuit which converts AC power input from secondary-side coils into DC power and outputs the DC power, and a control circuit which controls the full-bridge circuit by using a phase shift method based on voltage output by the output circuit. When a measured value of the amount of phase shift determined from at least one of the voltage and current output by the output circuit is smaller than a theoretical value of the amount of phase shift corresponding to the switching power supply operating in a continuous current mode, the control circuit prolongs dead time used in the full-bridge circuit in accordance with the difference between the measured value and the theoretical value.

A gas shower device having gas curtain comprises a first gas shower unit for injecting a reaction gas, thereby forming a reaction gas region, and a second gas shower unit. The second gas shower unit arranged around a periphery of the first gas shower unit comprises a buffer gas chamber for providing a buffer gas, and a curtain distribution plate. The curtain distribution plate further comprises a plurality through holes for injecting the buffer gas, thereby forming a gas curtain around a periphery of the reaction gas region. In another embodiment, an apparatus for depositing film is provided by utilizing the gas shower device having gas curtain, wherein the gas curtain prevents the reaction gas in the reaction gas region from being affected directly by a vacuum pressure so that a residence time of reaction gas can be extended thereby increasing the utilization of reaction gas and film-forming efficiency.

In a unit inverter system where multiple unit inverters are connected in parallel, the quantity of operating unit inverters is determined in accordance with an amount of power to be converted. A gate signal of a semiconductor switching element of a unit inverter is turned off after an output current of the inverter is reduced when reducing the quantity of inverter units, thereby improving the partial load efficiency of the system without an adverse effect on the system. A regulator connected to the inverter determines dead time of the inverter according to the output current value and an average output current value of the unit inverters, waits for the determined dead time so as to reduce the output current of the unit inverter, and then turns off the gate signal.

The invention relates to the technical field of waste gas circulating heating devices, in particular to a high-temperature hot air device suitable for waste gas circulation heating of a brick kiln. The high-temperature hot air device comprises a hot air flow channel and a heater arranged in the hot air flow channel; the hot air flow channel comprises an air blower, an air inlet pipe, an outer cylinder body, an inner cylinder body and a rotating body, wherein the inner cylinder body is arranged in the outer cylinder body, an outer flow channel is formed between the outer cylinder body and the inner cylinder body, nozzles are evenly distributed on the top of the inner cylinder body, and the rotating body is arranged in the inner cylinder body. According to the high-temperature hot air devicesuitable for waste gas circulation heating of the brick kiln, the principle of fluid mechanics and aerodynamics is fully utilized, and an 80-degree inclined plane, a diffuser pipe heat flow channel,an impeller inner bottom plate flow mixing device, a four-leg supporting device and the like are adopted in the structure, so that not only is water contained in waste gas further removed, but also the waste gas is fully mixed in the heating area and keeps the long stagnation time, the waste gas is sufficiently heated, the heating efficiency is improved, and the energy consumption is reduced.

An improved high input voltage instant start electronic ballast uses a substantially lossless snubber circuit. The substantially lossless snubber circuit is incorporated into the ballast to reduce turn off losses and increase the efficiency of the ballast. The snubber circuit includes two capacitors connected in parallel with respect to the two switching transistors or FETS in the inverter of the ballast. A series-resonant lamp voltage sensing circuit is also provided that uses a voltage dividing capacitor to accomplish lossless monitoring of the open circuit voltage of the ballast. A cable compensation circuit minimizes variations in the open circuit voltage due to the connecting and disconnecting of a cable to the ballast by limiting the turn on times of the transistors during high voltage conditions.

The invention discloses a rotary load switch contact arc extinguishing system of a sulfur hexafluoride (SF6) ring main unit. The system comprises a static contact, a dynamic contact corresponding to the static contact and a driving mechanism for driving the dynamic contact to move; a static contact insulating seat is arranged on the static contact; a plurality of metal grids are inlaid on the static contact insulating seat side by side; and an arc spacing plate is arranged between three-phase contacts. The load switch has simple process, strong arc extinguishing capacity and good on-off stability of transfer current, and meets the requirement of 1750A disjunction by test.

The invention is suitable for the technical field of switch driving, and particularly relates to a dual-channel gate driving circuit and a dual-channel gate driving chip. The dual-channel gate drive circuit comprises a first detection control circuit, a second detection control circuit, a parallel detection circuit, a pre-drive circuit, a first pull-up bridge arm, a first pull-down bridge arm, a second pull-up bridge arm and a second pull-down bridge arm, the parallel detection circuit detects whether PWM signals output by the first detection control circuit and the second detection control circuit are overlapped or not, and when the signals are detected to be overlapped, it is indicated that the current dual-channel gate drive circuit is applied in a dual-channel parallel mode. The parallel detection circuit respectively controls the first detection control circuit and the second detection control circuit to increase the dead time with the preset size, so that up-and-down straight-through of double channels of the double-channel gate drive circuit is avoided, and the drive reliability is improved.

The invention provides a lakeside zone for intercepting and purifying non-point source pollution. A first step land, a first depression land, a second step land, a second depression land, a third stepland and a third depression land are sequentially arranged outwards along a lake area, and a flow guide pipe is embedded in the bottom of the third step land; the cross sections of the three stages of step lands are trapezoidal, and the elevations of the three stages of step lands are increased step by step; the cross sections of the first depression land and the second depression land are inverted trapezoids, the cross section of the third depression land is concave, and the elevations of the three stages of depression lands are increased step by step; flood-tolerant emergent aquatic plantsare planted on the first step land, and drought-tolerant emergent aquatic plants are planted on the second step land and the third step land; and floating plants are planted in the first depression land, flooding-resistant emergent aquatic plants are planted in the second depression land, and turf is planted in the third depression land. According to the method, the terrain of the lakeside zone isreconstructed into multiple stages of step lands and depression lands, so that the stagnation time of non-point source pollution on the lakeside zone can be effectively prolonged, the non-point source pollution is prevented from directly entering the lake area, and favorable conditions are created for absorption and purification by aquatic plants in the lakeside zone.

The invention discloses a high-power high-voltage DC-DC converter applied to a trolleybus, and belongs to the field of electrical vehicles. The converter comprises an inductor, capacitors, controllable switches, a transformer, rectifier diodes, a freewheel diode, a surge suppression circuit, a current collection module, a voltage collection module and a controller. The DC-DC converter is connected with an external direct current grid, and then connected with the transformer via the surge suppression circuit and a ZVS half-wave quasi-resonant full bridge inverter module composed of the capacitors, the diodes and the controllable switches; the transformer is connected with a full bridge rectifier circuit after being connected with a resonant capacitor in series, and connected with an output inductor, the capacitor and a load via the resonant capacitor and the freewheel diode; the controller adjusts collected voltage and current values to be pulse width of a PWM signal, used for driving each controllable switch to switch on and off; switch losses are reduced via soft switching; the component is applicable to double-source trolleybus high-voltage high-power environment; and energy transmission is kept due to the addition of the resonant module under the condition that all the switches are switched off.

The embodiment of the invention discloses a performance testing method for replacing a siliceous material with glass fiber reinforced plastic recycling powder. Concrete comprises the following components: cement, lime, gypsum, aluminum powder paste, scrap iron, fly ash and a fan blade recycled material. According to the performance test method for replacing the siliceous material with the glass fiber reinforced plastic recycled powder, when the siliceous material is coal ash, the strength of an AAC product is reduced along with the increase of the mixing amount of the wind power blade recycled powder, the strength of the AAC product is increased along with the increase of the dry material amount, the replacement proportion is increased, the fluidity of slurry is reduced, and the water storage amount is increased; the strength decreasing proportion is gradually increased, and the strength of the prepared aerated block is in a decreasing trend; when sand is selected as the siliceous material, the strength and the compressive strength of the AAC product are improved along with the increase of the mixing amount of the recycled powder of the wind power blade; along with the increase of the dry material amount, the strength of an AAC product is gradually increased, and along with the increase of the mixing amount of wind power blade recycled powder, the water demand of slurry is increased, so that the standing time is prolonged, and the production is not facilitated.

The invention relates to a driving signal processing device and a motor system. The driving signal processing device comprises a dead zone detection circuit, a signal rising edge detection circuit, a signal delay circuit and a control unit. According to the invention, the dead zone detection circuit can detect the dead zone indication signal indicating whether the target dead zone duration is abnormal, the rising edge detection signal can be obtained based on the signal rising edge detection circuit, and then the control signal for performing delay control on the signal delay circuit is generated based on the dead zone indication signal and the rising edge detection signal. Therefore, when the signal time-delay circuit is triggered by the control signal, the upper and lower bridge arm driving signals can be subjected to time-delay processing to obtain the delayed driving signal, and the purpose of prolonging the time length of the dead zone by performing time-delay processing on the rising edge of the upper and lower bridge arm driving signals under the condition that the time length of the target dead zone is too short can be achieved.

The invention discloses a C80 autoclaving-free concrete pole production technology which comprises the following steps of: (1) mixing materials, namely uniformly stirring components of concrete by a secondary stirring mode; (2) forming, namely pouring the mixed material mixed to a pole steel mould for centrifugal shaping, and meanwhile sampling and preparing a test block; (3) performing steam maintenance, namely placing the pole and the test block to a maintenance pool for constant pressure steam maintenance; and (4) detecting, namely demoulding the test block and detecting one-day strength and seven-day strength, respectively. According to the C80 autoclaving-free concrete pole production technology provided by the invention, the autoclaving link of concrete can be omitted in the production process of high strength poles, so that energy consumption can be reduced. Autoclaving is omitted, so that concrete is prevented from being damaged by autoclaving, and the product durability is ensured. The technology can be further widely applied to tubular pipe production and has god economical and social benefits as well as good popularization prospect.

The invention discloses a full-digital super-power amplifier driving signal processing method, which utilizes a full-digital signal processing method to generate a plurality of paths of PWM (Pulse Width Modulation) waves with different phases to drive a power amplifier by comparing an input sinusoidal signal with a generated multi-phase triangular wave, so that the single-machine output power of the amplifier is effectively improved. Meanwhile, the quality of the driving signal of the power amplifier in a high-power environment is ensured, the output signal-to-noise ratio of the amplifier is effectively improved, and the output distortion degree of the amplifier is reduced.

The invention discloses a driving circuit and an inverter power supply. The driving circuit comprises a pulse width control module and a main driving module; a pulse width signal input end of the pulse width control module and a first pulse signal input end of the main driving module are electrically connected and are both used for receiving a first pulse signal; a pulse width signal output end ofthe pulse width control module is electrically connected with a second pulse width signal input end of the main driving module, and the pulse width control module converts the first pulse signal intoa second pulse signal and outputs the second pulse signal to the main driving module; the main driving module is used for generating a third pulse signal according to the first pulse signal and the second pulse signal, and the third pulse signal is output by the output end of the main driving module; the pulse width of the third pulse signal is determined by the first pulse signal and the secondpulse signal. According to the technical scheme provided by the embodiment of the invention, a driving signal (namely the third pulse signal) provided by the driving circuit for a BOOST main loop canbe matched with a working frequency of the BOOST main loop.

The invention provides a viscosity reduction and solid removal integrated device for catalytic cracking oil slurry. The viscosity reduction and solid removal integrated device can effectively carry out viscosity reduction and solid removal treatment on the catalytic cracking oil slurry. The viscosity reduction and solid removal integrated device comprises an ultrasonic viscosity reduction tank, electrostatic separation tanks, a constant-temperature water bath tank and an oil storage tank; the constant-temperature water bath tank is arranged above the oil storage tank through a supporting frame, the ultrasonic viscosity reduction tank is arranged above the constant-temperature water bath tank through a supporting frame, and the electrostatic separation tanks are mounted in the constant-temperature water bath tank; the ultrasonic viscosity reduction tank is communicated with the electrostatic separation tanks through hoses, the electrostatic separation tanks are communicated with the oil storage tank through hoses, and the oil storage tank is fixedly mounted through a leg type base; and the plurality of electrostatic separation tanks are arranged in the constant-temperature water bath tank, and the upper surface and the tank bottom surface of the separation tank end cover of each electrostatic separation tank are higher than the upper surface and the lower surface of the constant-temperature water bath tank.

A switching power supply includes an insulated transformer, a full-bridge circuit which converts input DC power into AC power and outputs the AC power to a primary-side coil, an output circuit which converts AC power input from secondary-side coils into DC power and outputs the DC power, and a control circuit which controls the full-bridge circuit by using a phase shift method based on voltage output by the output circuit. When a measured value of the amount of phase shift determined from at least one of the voltage and current output by the output circuit is smaller than a theoretical value of the amount of phase shift corresponding to the switching power supply operating in a continuous current mode, the control circuit prolongs dead time used in the full-bridge circuit in accordance with the difference between the measured value and the theoretical value.

The invention discloses a light scattering multilayered structure and a manufacturing method thereof. The light scattering multilayered structure comprises a transparent baseplate, a first transparent material layer and a second transparent material layer. The transparent baseplate is provided with a first surface and a second surface, the second surface is a sensitive surface, and the first surface is opposite to the second surface. The first transparent material layer is positioned on the first surface, and provided with a plurality of first projections to enable the first transparent material layer to have first average surface roughness. The second transparent material layer is positioned on the second surface, and provided with a plurality of second projections to enable the second transparent material layer to have second average surface roughness, and the first average surface roughness is larger than the second average surface roughness to enhance the light scattering capability of the transparent baseplate. The first average surface roughtness is in a range of between 120 [mu]m and 140 [mu]m.

The invention discloses a high-power high-voltage DC-DC converter for trolleybuses, belonging to the field of electric vehicles; comprising: inductance, capacitance, controllable switches, transformers, rectifier diodes, freewheeling diodes, surge suppression circuits and current acquisition modules , Voltage acquisition module and controller. After the DCDC converter is connected to the external DC grid, it passes through the surge suppression module, and then connects to the transformer through the ZVS half-wave quasi-resonant full-bridge inverter module composed of capacitors, diodes, and controllable switches; the transformer is connected to the full bridge after the series resonant capacitor Type rectification circuit, the output inductance, capacitance and load are connected through the resonant capacitor and the freewheeling diode, the controller adjusts the pulse width of the PWM signal with the collected voltage and current value, and is used to drive the conduction and closure of each controllable switch, soft switching The switching loss is reduced, and the selected components are suitable for the high-voltage and high-power environment of the dual-source trolleybus. The added resonant module realizes the energy transmission when all the switches are turned off.

To operate the internal combustion engine, a defined forced excitation is applied to the air ratio, which serves as the basis for the setpoint of the lambda controller. During the diagnostic mode, the diagnostic function (DIAGF) is used to determine whether there is a probe error (SOND_ERR) in the exhaust gas probe. If a probe fault is detected (SOND_ERR), the value of the measurement signal is detected as a start value (STW) in time relative to the edge of the setpoint curve of the lambda controller, after a defined first time period (TD1) The current value of the measurement signal is then detected as an end value (EW). From the start value (STW) and the end value (EW) it is known whether there is a filter fault (FIL_ERR) or an invalid time fault of the exhaust gas probe (DEL_ERR). The first time period (TD1) is suitably set such that the corresponding difference between the end value (EW) and start value (STW) in case of filter failure (FIL_ERR) is the same as the end value in case of invalid time failure (DEL_ERR) The corresponding difference between (EW) and start value (STW) differs by the specified difference.

Disclosed is a fire-proof thermal-insulation board of aerated concrete of B02-level lightweight autoclaved sand and its preparation method. Components of the thermal-insulation board are quartz sand, lime, cement, gypsum, aluminum powder, and foam stabilizer, weight percentages of the components are: 56%˜60% of the quartz sand, 8%˜11% of the lime, 20%˜30% of the cement, 2%˜4% of the gypsum, 0.24%˜0.26% of the aluminum powder, and 0.02%˜0.03% of the foam stabilizer. The fire-proof thermal-insulation board is made of an inorganic non-metallic material with lightweight, non-inflammable property and good thermal-insulation performance. The present disclosure well solves the thermal bridge problem of external wall of the building, and has A1-level fire-proof performance and good durability with the same service life as the building. The present disclosure overcomes low product strength, and inconvenience in transportation and construction in the prior art, reduces types of admixture used in the manufacturing process, and reduces the manufacturing cost.

The invention relates to a stimuli-responsive nano material, which can be combined with an antigen generated by cryoablation to form a nano in-situ tumor vaccine, can realize the functions of lymph node targeting, in-vivo tumor fragment adsorption, targeted activation of antigen-presenting cells, pH-responsive drug controlled release, drug loading and the like, and provides a new method and a new technology for tumor immunotherapy. On the one hand, tumor fragments generated by cryoablation retain more antigen information, and an antigen presentation system can be activated more efficiently; and on the other hand, the stimuli-responsive nano material effectively adsorbs tumor fragments and can carry a pattern recognition receptor stimulant or drug, so that the ability of targeting and activating antigen-presenting cells is enhanced. According to the stimuli-responsive nano in-situ tumor vaccine prepared by the invention, tumor antigens generated by cryoablation are loaded, so that the defect that the cryoablation cannot kill far-end focuses and free tumor cells is overcome, and the stimuli-responsive nano in-situ tumor vaccine is expected to induce systemic immunotherapy while killing local focuses.

The invention relates to a process and the respective installation for thermal treatment of granular solids, in particular for producing aluminum oxide from aluminum hydroxide, wherein the solids areheated in at least one preheating stage and then reacted in a reactor at 700 to 1400 degree. In at least one preheating stage, the average temperature gradient of the solids amounts to <15K / s and thedwell time of the solids amounts to >=15 s.

Disclosed is a method for deadtime optimization in a half-bridge switch or full-bridge switch wherein high-side and low-side switches comprise GaN transistors; a circuit for implementing the method; and a power switching system comprising a GaN half-bridge or a GaN full-bridge and a deadtime optimization system. The circuit comprises a drain current bump filter for generating a current charge output; and circuit elements for comparing the current charge output to a reference current charge Coss and generating a deadtime adjust signal. The deadtime adjust signal may be used to adjust deadtime to reduce or minimize deadtime, and deadtime losses, while avoiding cross-conduction.