181results about How to "Short opening time" patented technology

The invention discloses a constant-current and constant-voltage fly-back converter based on primary side feedback. The constant-current and constant-voltage fly-back converter comprises a rectifying bridge, an inverted U-shaped filter, a transformer, an auxiliary power supply circuit, a constant-current and constant-voltage controller and a switch tube, wherein the transformer consists of a primary winding, a secondary winding and an auxiliary winding; the constant-current and constant-voltage controller comprises a constant-voltage module, a frequency generator, a constant-current module, a joint gate, an RS trigger and a driving module; the output end of the constant-voltage module and the first and second output ends of the constant-current module are connected with three input ends of the joint gate; the input end of the constant-current module is connected with the emitting electrode of the switch tube, and is used for sampling a current signal of the primary winding; the output end of the joint gate is connected with the R end of the RS trigger, and is used for transmitting a switch-off signal generated by the joint gate to the R end of the RS trigger; the switch-on signal of the frequency generator is output to the S end of the RS trigger; the RS trigger is used for receiving the switch-on signal and the switch-off signal to generate a modulating signal; and the Q end of the RS trigger is connected with the input end of the driving module.

An elastic laminate capable of being rolled for storage and unwound from a roll when needed for use, includes an elastic layer selected from the group consisting of an array of continuous filament strands, an array of continuous filament strands with meltblown deposited on the continuous filament strands, and a film; a gatherable facing layer bonded to only one side of the elastic layer; and either an adhesive that demonstrates a relatively short open time deposited between the elastic layer and facing layer, or such adhesive and a postbonding adhesive or nonblocking agent, or a nonblocking agent layer deposited on the elastic layer on a side opposite to the facing layer.

The invention provides a device for subpackaging culture mediums. According to the device for subpackaging the culture mediums, culture dishes comprising dish covers and dish bottoms descend along a first pushing rod, a clamping part retracts inwards to clamp the dish covers tightly, the dish bottoms continue to descend to a horizontal rotating tray of culture dish separating equipment, and the first pushing rod continues to descend to the position below the horizontal rotating tray; the dish bottoms and the dish covers rotate together along with the culture dish separating equipment, and the horizontal rotating tray rotates to the position above a second pushing rod; after the culture mediums are injected, the second pushing rod pushes the dish bottoms upwards, so that the dish bottoms are made to make contact with the dish covers; the clamping part is loosened, the dish bottoms are covered with the dish covers, and the culture dishes injected with the culture mediums are recovered. According to the device for subpackaging the culture mediums, the continuity, speediness, quantification and the automation of subpackaging can be achieved, and the compatibility to the outlines, the diameter sizes and heights of the culture dishes is good; particularly, the device can be used for subpackaging novel culture dishes of which the diameter of dish bottoms is larger than the diameter of dish covers.

The invention discloses a simulation experimental method for a dynamic effect of coal and gas outburst. The simulation experimental method comprises the following steps: A, preparing a coal and gas outburst experimental system, wherein the system comprises a pressure container and a pipeline system which are fixed on the ground, a material inlet, an inflating hole and a sensor hole are formed in the pressure container, an outburst hole is formed in the pressure container, the outburst hole is connected with an explosion discharging device, the explosion venting device comprises a diameter variable pipe, a first bursting piece and a second bursting piece, whether the diameter variable pipe and the pressure container are inflated is controlled by a control chip according to the pressure intensity measured by the first sensor and the second sensor; B, filling coal particles into the pressure container from the material inlet; and C, gradually inflating the pressure container and the diameter variable pipe for increasing the pressure, and controlling the first bursting piece and the second bursting piece to be burst, so that the coal and gas outbursts. According to the simulation experimental method for the dynamic effect of the coal and gas outburst, the overall experimental effect of the dynamic effect is guaranteed to the maximal extent, and theoretical basis is provided for protecting and controlling the disaster of the coal and gas outburst.

An elastic composite material that does not require facing materials. The elastic composite material includes a first elastic meltblown layer, an array of continuous filament strands deposited on the first elastic meltblown layer, and a second elastic meltblown layer deposited on the continuous filaments strands opposite the first elastic meltblown layer. One or both meltblown layers and/or the continuous filament strands may include an elastic polyolefin-based meltblown polymer having a degree of crystallinity between about 3% and about 40%. Also included is a method of making the elastic composite material.

The invention discloses a multi-beam scatter communication device and a multi-beam scatter communication method, and relates to scatter communication antenna rapid alignment and multi-node centerless ad-hoc network technologies in the communication field. The communication device comprises a GPS (global positioning system), a monitoring unit, an indoor unit and an outdoor unit, wherein the indoor unit realizes modulation-demodulation for scattering signals and control for a centerless ad-hoc network protocol, provides a self-organizing and self-healing network function for nodes, and carries out information transmission. The communication method adopts a mode of sector beam switching, can automatically realize the whole process of antenna alignment, link establishment and information transmission of a scatter communication link, and has the remarkable characteristics of simple operation and convenient use. The method disclosed by the invention not only can support point-to-point communication and point-to-multipoint communication, but also can support centerless ad-hoc network communication among the multiple nodes, has high self-organizing, self-healing and anti-interference abilities, and is extremely applicable to medium/short-range small-capacity scatter communication.

The invention provides an electromagnetic resonance control circuit, an electromagnetic heating device and a method for controlling a transistor. The electromagnetic resonance control circuit comprises a power module, a resonance circuit, the transistor and a controller, the resonance circuit is connected to the power module, the transistor is arranged between the resonance circuit and the ground, and used for executing the power-on or power-off operation according to pulse width modulation signals sent by the controller to control the work state of the resonance circuit, and the controller is connected to the power module and the control end of the transistor, and used for adjusting the duty ratio of the pulse width modulation signals sent to the transistor according to the change condition of voltages output to the resonance circuit by the power module to control the power-on time of the transistor. According to the technical scheme, the power-on time of the transistor can be controlled according to the voltages output to the resonance circuit, power output is increased in a low-voltage area, power output is reduced in a high-voltage area, the peak voltage and the peak current of the transistor are reduced under the condition of identical power, and therefore the transistor is effectively protected.

The invention relates to a monitoring method of IGBT collector overvoltage double protection. An IGBT collector overvoltage double protection circuit, which comprises an IGBT, a microcontroller, an IGBT driving circuit, a resistor R1 and a resistor R2. An output end of the IGBT driving circuit is connected to a grid G of the IGBT. The collector C of the IGBT is connected to an input end of the microcontroller after voltage divider of the tandem voltage divider resistors R1 and R2. The output end of the microcontroller is connected to the input end of the IGBT driving circuit. The microcontroller comprises comparators CMP1 and CMP2, a first IGBT control circuit and a second IGBT control circuit, negative input ends of the comparators CMP1 and CMP2 are respectively connected with reference voltages, and output ends are respectively connected with the first IGBT control circuit and the second IGBT control circuit, wherein when the comparator CMP1 outputs a high electrical level, the microcontroller generates an interrupt handling program INT1 by the handling of the first IGBT control circuit; and when the comparator CMP2 outputs a high electrical level, the IGBT is turned off by the handling of the second IGBT control circuit, and the microcontroller generates an interrupt handling program INT2. By adopting the method, the IGBT collector voltage can be monitored in real time.

The invention discloses a stretch bending-straightening machine, which is used for continuously straightening a steel strip in the iron industry. The stretch bending-straightening machine consists of an outlet/inlet main drive, a tension device, a hydraulic system and a main body. The main body is additionally provided with a fast open oil cylinder, a support roller, a rotary joint and a limitation stop base, wherein the fast open oil cylinder can be instantaneously and fast opened when a welding gap of the strip steel passes through the main body and can be instantaneously reset to normally work, thereby preventing the surface of a roller and the strip steel from being mutually scrubbed; the support roller changes the installation on a roller box from line contact into face contact, thereby being capable of keeping the precision for long time use and guaranteeing the straightening quality of the strip steel; the rotary joint is in a pretightening type structure which adopts a combined type quill roller thrust bearing with large carrying capability, wherein the rotary joint and a top rod of the stop base are tightly contacted with each other under the function of a spring without impact force caused by axial pulsation when a work roller and a middle roller work, thereby prolonging the service life; and the limitation stop base conveniently changes a single roller on an upper roller box and unscrews screw nails of a lower roller box, so that a plurality of front top rods simultaneously and automatically withdraw from the rotary joint under the function of the spring, thereby being capable of conveniently changing a work roller assembly and a middle roller assembly.

The invention discloses an intelligent sample collecting device which comprises a machine frame. The machine frame is provided with a feed inlet. A rotatable rotating disc mechanism and multiple sample storage barrels used for collecting samples are arranged in a collecting cavity formed by the machine frame. The sample storage barrels are hung on the rotating disc mechanism. Each sample storage barrel is provided with a hinged barrel cover and an induction locking mechanism used for locking the barrel cover. The hinged position of the barrel cover is provided with an elastic part so that the barrel cover can bounce upwards to be opened when not locked. The feed inlet is provided with a liftable weighing mechanism. The weighing mechanism is provided with an induction unlocking assembly matched with the induction locking mechanism. When the rotating disc mechanism drives the sample storage barrels to rotate to the position below the feed inlet, the weighing mechanism raises to lift up the sample storage barrels, so that the induction locking mechanism induces an unlocking signal of the induction unlocking assembly to open the barrel covers for sample connection and weighing operation. The intelligent sample collecting device has the advantages that the structure is simple and compact, the intelligence degree is high, sample collection and transfer safety is high, sample collection quality precision is high, working efficiency is high, and the production cost is low.

The invention discloses a circuit for reducing turn-on time of a current control type switch adjusting system. An exponential wave generator, a second comparator and a or gate are additionally arranged for the circuit based on an existing primary side-feedback constant current constant voltage controller. The circuit is additionally arranged, so that a flyback converter constructed by the circuit is not limited by leading edge blanking time any more, that is, shorter turn-on time and higher lowest switch frequency can be realized without load. Therefore, the flyback converter constructed by the circuit has better dynamic response capacity and lower standby power consumption than that of a flyback converter constructed by an existing primary side-feedback constant current constant voltage controller in a same condition.

The invention discloses an elevator for disabled people. The elevator comprises an external calling device, an internal calling device, a lift car and a control terminal, wherein the internal calling device comprises a disabled people operation box and an ordinary operation box, a plurality of internal selection disabled people buttons and a plurality of internal selection ordinary buttons are respectively arranged on the disabled people operation box and the ordinary operation box, and the external calling device comprises two external calling disabled people buttons and two external calling ordinary buttons. Compared with the prior art, the elevator for the disabled people is provided with the ordinary operation box and the external calling ordinary buttons in an ordinary elevator and is also provided with the disabled people operation box and the external calling disabled people buttons, and in addition, the internal selection disabled people buttons arranged on the disabled people operation box and the external calling disabled people buttons arranged in the external calling device adopt braille buttons, so the disabled people with poor vision can conveniently do operations such as floor selection in the elevator, elevator starting and stopping and warning, and can call the elevator at a floor station of each floor for selecting ascending or descending, and convenience is brought for the disabled people to operate. Meanwhile, the invention also discloses an elevator control method.

The invention belongs to the field of electronic technology, and relates to an inductively coupled power transfer (ICPT) device with a pull-down auxiliary switch. A group of pull-down auxiliary switch branch is added to an LC resonant single tube inverting bipolar inverting circuit topology used by the existing ICPT device, the branch comprises an auxiliary switch tube, a main switch tube and the auxiliary switch tube have the same switch frequency, soft switch control can be both realized, no shoot-through problem exists between the two tubes, and the reliability is improved. In a condition of keeping the advantages of the original circuit, voltage borne at two ends of the switch tube is reduced to 2/3 the original voltage, the device can adopt a metal oxide transistor as a switch tube, the switch frequency can reach more than 83kHz, and as the auxiliary switch tube is short in turn-on time and low in power consumption, a technical scheme for furthering reducing the size and the weight of the ICPT device and reducing the cost is provided.

The invention pertains to the design of cockpit ventilation windows, relating to a multi-functional bird collision resistant ventilation window. A locking key and a locking bolt are arranged on a handle, the locking key is jointed with one end of the locking bolt, the upper surface of the locking bolt is jointed with a torsional spring, and the other end of the locking bolt is jointed with a lockhole on a lock tray; the handle is fixedly connected with a front lower latch hook, the external end of the front lower latch hook is jointed with a lock column, the middle point of the front lower latch hook is connected with the middle point of a rear lower latch hook by a connecting rod component, the inner end of the front lower latch hook is connected with a roller wheel component, the roller wheel component is blocked into a lower slideway, the rotating shaft of the rear lower latch hook is connected with a rocker arm by a torque tube, the external end of the rear lower latch hook is jointed with the lock column, the inner end of the rear lower latch hook is fixedly connected with the roller wheel component, the roller wheel component is blocked into the lower slideway, a rear upper rocker arm is connected with the rocker arm by the connecting rod component, the inner end of a rear upper latch hook is fixedly connected with an upper roller wheel component, and the upper roller wheel component is blocked into an upper slideway. In respect of the ventilation window, a set of mechanism is added in the handle and an outboard unlock function is added on basis of the bird collision resistance of the ventilation window, thus ensuring higher safety and reliability of the mechanism.

The invention belongs to a circuit system applied to signal controlling and processing of medical equipment and particularly relates to a resonant transformation circuit applied to medical equipment and provided with synchronous rectification control. The technical scheme provided by the resonant transformation circuit does not need a delay circuit, body diode voltage of a synchronous rectifier tube is not detected, and voltage signals are obtained directly after current in a secondary side winding is converted into low current through a current transformer, thereby reducing opening time of a body diode of the secondary side rectifier tube as much as possible, and further improving efficiency. Simultaneously, a current directly-driving method in the secondary side winding is adopted, thereby avoiding alternating conduction of an upper tube and a lower tube, and enhancing reliability of circuits in the medical equipment. In addition, the resonant transformation circuit does not need additional control circuits or zero passage detection, only needs the current transformer to convert the current into the low current so as to conveniently form driving voltage to drive a winding reset circuit of the current transformer, and is simple in circuit and low in cost.

The invention discloses a sterilization and refreshing control method of a refrigerator. The sterilization and refreshing control method comprises the following steps of: (1) detecting whether a refrigerator door is opened; (2) when the refrigerator door is closed each time, controlling the refrigerator to enter a first mode; (3) after a sterilization device and a fan continuously run a first predetermined time, controlling the refrigerator to enter a second mode, wherein the second mode comprises the steps of: (a) continuously running the sterilization device and the fan for a second predetermined time, and (b) stopping running for a third predetermined time, and circularly executing the steps (a) and (b) for the predetermined times; (4) after the steps (a) and (b) are circularly executed for the predetermined times, controlling the refrigerator to enter a third mode; and (5) returning to the step (3) and circularly executing the steps (3) and (4). According to the sterilization and refreshing control method of the refrigerator, disclosed by the embodiment of the invention, the sterilization efficiency is improved, the switch on time of an ultraviolet lamp is greatly shortened under the condition that the sterilization and refreshing effects are guaranteed, and further the service life of the ultraviolet lamp is prolonged.