49results about How to "Short power-on time" patented technology

The invention relates to a novel power-on surge current suppression circuit. The novel power-on surge current suppression circuit comprises a power supply circuit, a surge current suppression resistor end voltage sampling and comparison circuit, a relief resistor, a metal oxide semiconductor (MOS) transistor, a surge current suppression resistor and an optional small-capacity high-frequency filtering capacitor, wherein the power supply circuit comprises a rectification diode, an energy storage filtering capacitor and a buck voltage limitation circuit, the surge current suppression resistor end voltage sampling and comparison circuit comprises a first end voltage sampling resistor, a second end voltage sampling resistor, a reference voltage source and a comparator, a drain of the MOS transistor is connected with a DC-DC converter, a source of the MOS transistor is connected with a negative end of a rectifier bridge, a grid of the MOS transistor is connected with an output end of the power supply circuit, an input end of the power supply circuit is connected with an AC N/L end, the surge current suppression resistor is connected in parallel to the drain and the source of the MOS transistor, the relief resistor is connected in parallel to the grid and the source of the MOS transistor, and the optional small-capacity high-frequency filtering capacitor is connected between a positive end and the negative end of the rectifier bridge. With the power-on surge current suppression circuit disclosed by the application, the power-on surge current is suppressed better, the power consumption of an MOS transistor driving circuit is low, the starting speed is fast, and the power-on time allowed again is short.

The invention provides a method and a system for controlling hard disk electrification in a hard disk array. The method comprises the steps of detecting output current of a power module in real time, comparing the output current and a set first threshold value, adopting a preset first time interval to sequentially perform the electrification to each hard disk in the hard disk array when the output current is smaller than the set first threshold value, comparing the output current with a set second threshold value when the output current is larger than the set first threshold value, and adopting a preset second time interval to sequentially perform the electrification to each hard disk when the output current is larger than or equal to the first threshold value and smaller than the second threshold value, wherein the second threshold value is larger than the first threshold value, and the second time interval is larger than the first time interval. By means of the method and the system for controlling the hard disk electrification in the hard disk array, electrification impact current is controlled not to exceed power output limitation when the electrification is performed to the hard disk array, and electrification time of the whole hard disk array is short.

The invention provides a motor-driven energy-saving four-way reversing valve with a compact structure and lower production cost. The motor-driven energy-saving four-way reversing valve comprises a synchronous motor and a cam piece driven by the synchronous motor; a first location switch and a second location switch are arranged close to the cam piece; the cam piece is provided with a cam which makes the on-off state of the first location switch always opposite to that of the second location switch and making the on-off states of the first location switch and the second location switch simultaneously changed once when the cam piece rotates 1/4 cycle; a contact at one end of the first location switch is electrically connected with a heating supply line; a contact at one end of the second location switch is electrically connected with a refrigerating supply line; a contact at the other end of the first location switch and a contact at the other end of the second location switch are electrically connected with one electrode of the synchronous motor; and the other electrode of the synchronous motor is electrically connected with a common line. The motor-driven energy-saving four-way reversing valve has the advantages of short power-on time, high action reliability, simple structure, simplified assembling process, low cost and the like.

The invention discloses a double-coil undervoltage tripper. The double-coil undervoltage tripper comprises an EMC filter circuit, a rectifying circuit, a sampling circuit, a PWM circuit, a first switch circuit, a power supply circuit, a comparing circuit, a bolt circuit, a differentiating circuit, a second switch circuit and a double-coil undervoltage electromagnet, wherein the EMC filter circuit is used for bidirectionally inhibiting interference signals generated by a power grid and an internal circuit; the double-coil undervoltage electromagnet comprises a stabilizing winding, a strong starting winding and a movable iron core. According to the double-coil undervoltage tripper, the reliable pull-in when the voltage of the power grid is higher than 85% of rated voltage is guaranteed, and the reliable tripping when the voltage of the power grid is lower than 50% of the rated voltage is guaranteed; by virtue of relatively high power of the strong starting winding and relatively low power of the stabilizing winding, the high-reliability pull-in can be achieved, and the low-power operation is simultaneously considered, so that the heating of the electromagnet is avoided. Besides, after a power supply circuit of the double-coil undervoltage tripper is connected to the second switch circuit in series, the energy efficiency of the circuit is effectively improved when the integral circuit is adequately simplified.

The invention relates to a two-stage wake-up circuit for underwater acoustic communication and a wake-up method thereof. The two-stage wake-up circuit is respectively connected to a receiving node anda receiving transducer, the receiving transducer performs data communication with the sending node through a sending transducer, and the two-stage wake-up circuit is characterized in that: the two-stage wake-up circuit comprises a signal preprocessing module and a single-chip microcomputer module; the signal preprocessing module continuously monitors a communication channel, and when the receiving transducer sends a wake-up signal, the received wake-up signal is preprocessed and then sent to the single-chip microcomputer module; the single-chip microcomputer module judges the preprocessing result according to a preset voltage threshold value; and when the preprocessed wake-up signal exceeds a preset voltage threshold, validity judgment is carried out on the preprocessed wake-up signal, and two paths of signals are generated, one path is an interrupt signal used for waking up the receiving node, and the other path is a signal for identification processing of the preprocessed wake-up signal. The circuit and the method can be widely applied to the field of underwater acoustic communication.

The invention provides a motor driven four-way reversal valve which has the advantages of compact structure and lower manufacturing cost. The four-way reversal valve comprises a synchro motor and a cam member driven by the synchro motor, wherein the rotating angular velocity of the cam member is same to that of a reversing rotor, and a location switch with a normally open contact, a normally close contact and a public contact is arranged nearby the cam member; the cam member is provided with a cam used for leading the location switch to act and allowing the work position of the location switch to change once when the cam member rounds one-quarter circumference; when the reversing rotor is located in a heating position, the contact which is just switched to be disconnected with the public contact on the location switch is a heating contact, and the other contact is a refrigerating contact; and the heating contact is conducted with a heating supple line, the refrigerating contact is conducted with a refrigerating supple line, the public contact is conducted with one electrode of the synchro motor, and the other one electrode of the synchro motor is conducted with a concentric line. The four-way reversal valve provided by the invention has the advantages of short conduction time, high motion reliability, simple structure, simplified fitting process, lower cost and the like.

The present invention discloses an earth leakage protection device overload testing device. The earth leakage protection device overload testing device is short in the overload test power-on time, employs a high-power transformer with the high loading capacity and provides 120V and 90-120A output so as to save the cost; the earth leakage protection device overload testing device with a self-inspection and testing product no-load debug function; and moreover, the earth leakage protection device overload testing device has a test data statistical analysis function and a test failure alarm function, and is simple in electrical line and convenient in maintenance, low in cost and low in test cost.

The invention is suitable for the technical field of deicing, and provides a mechanical deicing device and deicing method for an electric heating segmentation area, and the deicing device comprises: a plurality of electric heating elements which are arranged in an array mode; and vibration elements, wherein the positions of the vibration elements and the positions of the electric heating elements are arranged in a one-to-one correspondence mode. The plurality of electric heating elements and the plurality of vibration elements are distributed on a first surface and a second surface of the airfoil model, the first surface and the second surface form a front edge area of the airfoil model, and the first surface and the second surface are separated by a front edge line; and the upper surfaces of the first surface and the second surface are provided with skins, the electric heating elements are embedded into the skins, and the vibration elements are installed on the inner surfaces of the skins. The whole ice block is divided into small ice blocks, then vibration deicing is carried out on each small ice block, the deicing efficiency is high, no residual ice appears, and the deicing effect is good.

The invention provides an electromagnetically-triggered friction type pressing and releasing device. The device comprises a triggering mechanism, two drag hooks, a locking mechanism, an upper pressingplate, two triggers, two torsional springs, two tension springs, a lower pressing plate and a mounting base. The trigger mechanism is installed at the top of the mounting base, the upper pressing plate, the triggers, the torsion springs, the tension springs and the lower pressing plate are all arranged in the mounting base, the locking mechanism penetrates through the left side and the right sideof the mounting base, and the two drag hooks are connected with the left end and the right end of the locking mechanism respectively. In a locking state, the triggering mechanism limits the two triggers to rotate, the tension springs tension the triggers, the triggers are pressed on the upper pressing plate to press the locking mechanism, and the two drag hooks are locked; in an unlocking state,the trigger mechanism acts to unlock the two triggers, the torsion springs drive the triggers to rotate, the tension springs are separated from the triggers, pressing of the triggers on the upper pressing plate is relieved, the locking mechanism is released, and the two drag hooks are separated. The device has advantages of a large bearing capacity, quick action, repeatable testing and insensitivity to a high temperature and a low temperature, and the device can be applied to various connection and separation occasions.

The invention relates to an electric permanent magnetic chuck for a conveyer belt. The electric permanent magnetic chuck for the conveyer belt comprises a chuck body and the conveyer belt, wherein the chuck body is located above the conveyer belt. The electric permanent magnetic chuck for the conveyer belt further comprises a coil and a permanent magnet, wherein the coil and the permanent magnet are arranged in the chuck body, the permanent magnet is located below the coil, and the permanent magnet is made of rare earth permanent magnetic materials. The electric permanent magnetic chuck for the conveyer belt is simple and reasonable in structure. In the whole working process, the chuck is only powered on when a non-magnetic state is needed, the electrifying time is quite short, heating and instability which are caused by long-term working are avoided, the chuck can be magnetic all the time as long as the chuck is powered off, and safety accidents caused by loss of excitation of parts are avoided.

Provided is an electric steering lock device, which is not necessary to increase the cost to prevent heat fault resulted from overheating of motors. The electric steering lock device controls the motor to implement unlocking operation in the normal mode based on the predetermined power-on maintain time for the electric motor and power-on suspension time of power suspension. Under the circumstance that the unlocking instruction from a driver is received and the unlocking operation in the normal mode is implemented but the movement of the locking bolt toward the unlocking position is not detected, according to the unlocking operation of the driver for the next time, the unlocking operation mode is switched into a motor overheating protection mode that the power-on maintain time is set to be shorter than power-on maintain time in the normal mode, so that the load ratio calculated from the power-on maintain time and the power-on suspension time is smaller than the load ratio in the normal mode.

The invention discloses an LED illumination light source construction method for product surface defect detection. The method comprises the steps that product surface defects are classified into three-dimensional defects and two-dimensional defects; a same-frequency confocal LED illumination light source for three-dimensional defect detection is constructed; a same-frequency LED illumination lightsource for two-dimensional defect detection is constructed; and according to the defect type of the surface of a to-be-detected product, the constructed same-frequency confocal LED illumination lightsource or the constructed same-frequency LED illumination light source is selected for corresponding detection. The multi-dimensional defects are classified, the different LED illumination light sources are selected for detection, LED lamp beads can be instantly lightened, overloading can be achieved, brightness is remarkably improved, the heating amount is small, an active heat dissipation component is not needed any more, the overall size is small, field installation of the illumination light sources needed for product surface detection is facilitated, the method is suitable for various industrial environments, more accurate sampling data can be obtained, the dynamic range is wider, and the method adapts to more sample types.

The invention discloses a bistable electromagnetic system applied to a contactor and the contactor thereof. The bistable electromagnetic system comprises a yoke iron shell frame, a coil structure, a magnetic pole and a movable iron core assembly; the magnetic pole is fixed in a middle cavity of the coil structure, and the movable iron core assembly comprises an upper iron core, a permanent magnet and a lower iron core which are connected into a whole and arranged in the middle cavity; and the upper iron core is provided with a driving rod penetrating out of the upper end portion of the yoke iron shell frame, and the driving rod is connected with a moving contact assembly of the contactor. The electromagnetic system adopting the technical scheme has a bistable magnetic holding function and is good in vibration resistance, the coil structure can work by adopting a positive and negative pulse excitation mode, the power-on time is short, the response speed is high, and the power consumption of the coil structure can be greatly reduced. The electromagnetic system is simpler in structural design, convenient to form and manufacture, high in assembly efficiency, beneficial to reducing the size of the electromagnetic system, stable in product performance and capable of reducing the production cost, and thus the use performance and the market competitiveness of the contactor are improved.

The invention discloses a same-frequency confocal LED lighting light source structure for detecting three-dimensional defects on the surface of a product. The light surface structure is high in reliability of fixation with a lens assembly, convenient to adjust the lighting focal length of an LED lighting light source, capable of instantaneously lightening LED lamp beads, capable of being overloaded, remarkably improved in brightness, capable of being synchronously and sequentially lightened with pixels of a linear array CCD sensor, while the lighting requirement is met, energy consumption is greatly reduced, the service life is prolonged, the confocal working process is achieved through the original optics, the product surface (especially textiles) detection sampling accuracy is greatly improved, accurate original data can be conveniently provided for subsequent image processing and analysis, the CCD sensor can be conveniently used in cooperation, control is convenient, the LED lamp bead which does not need to be matched with a heat dissipation unit and can be lightened instantly can be lightened in an overload mode, the service life is not affected, the heat dissipation requirement can be met through an aluminum circuit substrate, design is ingenious, the concept is novel, and good application prospects are achieved.

The invention discloses a same-frequency LED lighting source construction method for detecting product surface two-dimensional defects. The same-frequency LED lighting source construction method is characterized by selecting a same-frequency LED lighting source for lighting according to attributive characteristics of the product surface two-dimensional defects, facilitating detection of the two-dimensional defects including different colors, stains and damages, and enabling the LED lighting sources to instantaneously lighten LED lamp beads. According to the working property that the LED lighting sources can be lightened individually, the LED lamp beads at the corresponding positions are lightened in a mapping control mode, overload can be ensured, the brightness is remarkably improved, anddue to the fact that the power-on time is short, the actual power consumption is low, the heating amount is small, an active heat dissipation component is not needed any more, the overall size is small, field installation of product surface detection is facilitated, pixels of a CCD sensor are synchronously lightened in sequence, the service life is prolonged, the illumination effect is good, theheat dissipation efficiency is high, the accuracy of detection and sampling of the product surface two-dimensional defects is greatly improved, and the same-frequency LED lighting source constructionmethod has good application prospect while the illumination requirement is met.

The invention discloses a single-coil shunt release. The single-coil shunt release comprises an EMC (electro-magnetic compatibility) filtering circuit, a rectifying circuit, a sampling circuit, a PWM (pulse-width modulation) circuit, an integrated circuit, a switch circuit, a comparison circuit, a door pin circuit, a differentiating circuit, a power circuit and a single-coil shunt electromagnet, wherein the EMC filtering circuit is used for restraining interference signals generated from a power grid and an internal circuit in two ways; and the single-coil shunt electromagnet comprises a coil winding and a movable iron core. By the single-coil shunt release, releasing actions do not exist when the voltage of the power grid is lower than nominal voltage by 70%, high-reliability releasing can be guaranteed when the voltage of the power grid is higher than the nominal voltage by 70%, after the single-coil shunt release is released, the releasing state of the single-coil shunt release is always maintained until the voltage of the power grid is removed or is reduced to be below 30%, and possibility of reclosure is stopped effectively. During releasing of the single-coil shunt release, reliable shunt releasing can be implemented by the electromagnet through the maximum power, and the conduction time is quite short; and after releasing of the single-coil shunt release, a small power is applied to the electromagnet so as to maintain the releasing state, heating and overturning of the electromagnet can be avoided effectively, and the electromagnet can also be in a powered-on state for a long time.