Abstract: A buck-boost converter working in a buck mode with buck switching cycles, a boost mode with boost switching cycles or a buck-boost mode with buck-boost switching cycles. Each of the buck-boost switching cycles has an AC phase, an AD phase and a BD Phase, and the duty cycle of the AC phase is determined by a reference signal, a feedback signal and an inductor current sense signal, the duty cycle of the AD phase is controlled and maintained at a preset duty threshold, the time period of the buck-boost switching cycle equals the time period of the buck switching cycle and the time period of the boost switching cycle.

Abstract: Provided is a magnetic material concentration measuring device including: a bobbin having an outer circumference around which an exciting coil, an output coil, and a further exciting coil are wound; an eccentric hole formed in the bobbin; a rotor that is rotatably fitted in the eccentric hole about an eccentric axis line; a first cutout part that forms a first flow passage on one end side in an eccentric axis line direction of the rotor; a second cutout part that forms a second flow passage whose angle is shifted in a rotor rotation direction with respect to the first cutout part, on another end side in the eccentric axis line direction of the rotor; and a communication passage that connects the first flow passage and the second flow passage.

Abstract: The invention relates to a method for preparing cathode particles under a co-precipitation reaction by feeding NaOH and metal sulfate solution into different vessels. The invention further provides a cathode active material having the cathode particles. By the method of the invention, the number density distribution of prepared particles is much smaller than feeding NaOH and metal sulfate together into same vessel.

Abstract: A fault detection method is sampling currents flowing through a plurality of switching circuits to generate a plurality of current sampling signals, generating a first reference signal and a second reference signal based on a predetermined reference signal and a ripple threshold signal, and generating a plurality of fault signals based on comparison results of each of the plurality of current sampling signals with the first reference signal and the second reference signal. When one of the plurality of current sampling signals is between the first reference signal and the second reference signal, a corresponding one of the plurality of fault signals changes to a first state, and when the corresponding one of the plurality of fault signals remains the first state for more than a predetermined time period, a corresponding one of control signals turns off a corresponding one of the plurality of switching circuits.

Abstract: A control circuit used in a resonant converter with a switching circuit and a resonant circuit is provided, the switching circuit has a high side transistor and a low side transistor, the resonant circuit has a resonant capacitor and a resonant inductor. The control circuit includes: a calculating module used to generate an output current calculating value based on a voltage across the resonant capacitor and a correction signal at an off moment of the high side transistor; a comparing module used to compare the output current calculating value with a burst mode threshold value and generate a burst mode control signal by comparing the output current calculating value with the burst mode threshold value; and a switching control module used to control the resonant converter to work in a burst mode or a normal mode based on the burst mode control signal.

Abstract: The motor rotor assembly structure includes a rotating shaft, a plurality of rotor cores formed by a plurality of rotor punches neatly laminated, and rotor pressure plates installed at front and rear ends of the rotor core. The rotor core is provided with a shaft hole for mounting the rotating shaft in the middle in an axial direction. Two rotor pressure plates press the plurality of rotor punches. The rotating shaft is a hollow shaft. The plurality of rotor punches has the same structure. Each of the rotor punches is provided with a plurality of sets of positioning holes. The plurality of rotor punches is positioned and fixed to the rotating shaft through the plurality of sets of positioning holes to realize oblique poles between rotor segments. The motor rotor assembly structure is made by laminating one type of rotor punches.

Abstract: A control circuit having: a logic circuit, configured to provide a high side boot-strap capacitor control signal set and a low side boot-strap capacitor control signal set; a high side boot-strap capacitor control circuit, configured to provide a high side power signal to control a high side power switch; a high side boot-strap capacitor, having a first terminal coupled to a control terminal of the high side power switch, and a second terminal coupled to the high side boot-strap capacitor control circuit; a low side boot-strap capacitor control circuit, configured to provide a low side power signal to control a low side power switch; and a low side boot-strap capacitor, having a first terminal coupled to a control terminal of the low side power switch, and a second terminal coupled to the low side boot-strap capacitor control circuit.

Abstract: A driving circuit for driving a synchronous rectifier device. The driving circuit may include a controllable clamping circuit having a first terminal coupled to a sensing terminal of the driving circuit, a second terminal coupled to a reference ground terminal of the driving circuit, a third terminal coupled to a driving terminal of the driving circuit, and a control terminal configured to receive a supply indication signal indicative of a voltage potential at a supply terminal of the driving circuit. The third terminal of the controllable clamping circuit may be connected to the second terminal of the controllable clamping circuit when the supply indication signal indicates that the voltage potential at the supply terminal has not been established to maintain the synchronous rectifier device off.

Abstract: A switching mode power supply preventing false triggering of an over current protection due to a surge pulse. The switching mode power supply has a switch and an inductor. An inductor current flows through the inductor. The switching mode power supply turns off the switch and meanwhile starts timing for a preset period of time when the inductor current is larger than a preset value. The switch is kept off during the preset period of time and is then turned on when the preset period of time expires.

Abstract: The high-efficiency soldering apparatus for a winding head of a flat-wire motor includes a support base, a solder tray, a solder spot isolation and limit plate, a shaft lever and a movable tray. The solder tray is provided at the center of the support base. The solder spot isolation and limit plate is provided on the solder tray. The shaft lever is provided on the support base. The movable tray is provided on the shaft lever. The movable tray is located above the solder tray. The movable tray moves vertically along the shaft lever. A stator is placed at the center of the movable tray, and a winding head of the stator extends below the movable tray.

Abstract: A charging termination control module and a battery charger circuit comprising the same. The charging termination control module may detect/monitor/sense a charging current flowing through a charging control transistor of the battery charger circuit to provide a current sense signal, and to maintain a transistor voltage drop across the charging control transistor at a predetermined difference value once the transistor voltage drop reaches the predetermined difference value. The charging termination control module may also turn the charging control transistor off once the current sense signal is decreased to reach or to be lower than a charging termination threshold.

Abstract: In feature value extraction processing step, feature values are extracted from time-series vibroacoustic data in equipment in operation. In machine learning diagnosis step, accumulated are feature values corresponding to normal equipment-operation-state and general measurement data on equipment. Probability distribution model related to correlation between general measurement data and feature values corresponding to normal equipment-operation-state and constructed through machine learning is fed with general-measurement data and feature values extracted in feature value extraction processing step to calculate degree of anomaly based on probability distribution model.

Abstract: A lateral DMOS having a well region, a source region, a drain region, a first gate region and a second gate region. The first gate region may be positioned atop a portion of the well region near the source region side. The second gate region may be formed in a portion of the well region near the drain region side. The second gate region includes a shallow trench isolation structure formed in a shallow trench opened from a top surface of the well region and extended vertically into the well region, and having a first sidewall contacting with the drain region or abut the drain region, and further having a second sidewall opposite to the first sidewall and laterally extended below the first gate region.

Abstract: The present invention provides a method for preparing an aromatic polyamide porous membrane and an aromatic polyamide porous membrane prepared by the above method. The method for preparing an aromatic polyamide porous membrane includes the following steps: mixing an ionic liquid with an aromatic polyamide into a solvent to form a mixed solution; the mixed solution forming a membrane in a coagulation bath; and extracting with an extractant to remove the solvent and the ionic liquid from the membrane to yield a porous membrane. In the method of the present invention, the application of the ionic liquid would greatly reduce the application of additives; further, the ionic liquid has a high stability and is easy to be separated from other solvents and be recycled, which assures the safety during the usage and recycle thereof.

Abstract: The present disclosure provides a liquid membrane conveying apparatus for preparing a porous membrane includes a transmission unit and a carrier unit. The carrier unit conveys a liquid membrane into a gelling solution by the entrainment of the transmission unit. The carrier unit includes a first carrier and a second carrier. The first carrier and the second carrier respectively contact with opposite edges of the liquid membrane along a conveying direction of the liquid membrane. The consistency of the pores on the two surfaces of the porous membrane is improved by using the liquid membrane conveying apparatus.

Abstract: An air foil bearing includes a bearing housing having a cylindrical shape that forms an accommodation space in a middle thereof for a rotating shaft, rotor, or journal; a first foil including a plurality of bump foils, which are arranged along an inner wall surface of the accommodation space of the bearing housing; and a second foil including a plurality of top foils, which are arranged in a circumferential direction along an inner circumference of the bearing housing to correspond to the plurality of bump foils and to support the rotating shaft, rotor, or journal. A portion of at least one of the plurality of top foils of the second foil is thicker than the other top foils of the plurality of top foils.

Abstract: A high-efficiency power generation system includes: a combustor configured to generate a circulating fluid by burning a fuel; an expander configured to generate power by expanding the circulating fluid; a power generator configured to generate electricity using the power generated by the expander; a compressor configured to compress the expanded circulating fluid; a pump configured to circulate the compressed circulating fluid; a heat exchanger configured to allow the expanded circulating fluid passing through the expander and the compressed circulating fluid passing through the compressor to exchange heat with each other; and a power transmitter including a driving shaft, and configured to rotate a driven shaft, which includes shafts of the compressor and the pump, to transmit the power generated by the expander to the compressor and the pump.

Abstract: A test method of a voltage regulator having a plurality of parameters that need to be set, the test method includes: receiving a user requirement on a computer; generating a plurality of setting combinations of the plurality of parameters, the plurality of parameters has different combination of values in different setting combinations; downloading the plurality of setting combinations to the voltage regulator via a first I/O bus and configuring the voltage regulator with each setting combination; configuring communication between a controller provided by the computer and measurement devices; executing the communication between the controller and the measurement devices via a second I/O bus; and displaying test result of each configured voltage regulator on the computer.

Abstract: The present disclosure provides a cathode active material and a lithium ion electrochemical system including the same. A general formula of the cathode active material is as follows: z{xLi2MnO3*(1?x)LiRO2}*(1?z) LiaR?1-aOy, herein R and R? independently include one or more metal ions, an oxidation valence state of the R is 3+, and an oxidation valence state of the R? is 2+, herein, 0?x?0.25, 0<a?0.75, 0.625?y?1, 0.75?z<1.

Abstract: A battery charging and balancing circuit, for charging a battery pack having a plurality of cells. The battery charging and balancing circuit having a detecting circuit to provide a balancing connection indicating signal; a charging circuit to charge the battery pack based on the cell voltages when the balancing connection indicating signal is valid, and to charge the battery voltage otherwise; and a balancing circuit to control the discharging switches coupled with the cells based on the cell voltages when the balancing connection indicating signal is valid.