8results about How to "Use less frequently" patented technology

The embodiments of the present invention relate to the field of circuit technology, and disclose an input switching circuit and method, a circuit board assembly and an adapter. The circuit includes: a first port, a second port, a third port, an overvoltage protection circuit and a switching unit; the first port is used to connect a first power supply, the second port is used to connect a second power supply, the third port is used to connect an external load, the first port is also connected to the input end of the overvoltage protection circuit, the output end of the overvoltage protection circuit is connected to the third port, the second port is also connected to the third port, the first input end of the switching unit is connected to the first port, the second input end of the switching unit is connected to the second port, and the output end of the switching unit is connected to the enable end of the overvoltage protection circuit. The present application preferentially uses a power supply that does not require an overvoltage protection circuit to power the load, so as to reduce the frequency of use of the overvoltage protection circuit, thereby extending the maintenance cycle of the overvoltage protection circuit to save maintenance costs.

The utility model discloses a cascade type medium-voltage frequency conversion cabinet adopting a mortise and tenon joint installation technology. The cabinet comprises a frame, door plates arranged at the front end and the rear end of the frame, a top cover arranged at the top of the frame, a base arranged at the bottom of the frame, epoxy resin plates arranged at the left end and the right end of the frame, and a glass fiber reinforced plastic assembly arranged in the frame. A plurality of current transformers are arranged in the frame; a fan is arranged above the top cover; the plurality of power units are arranged on the laminates of the glass fiber reinforced plastic assembly; the series connection lines among the plurality of power units pass through the current transformer. According to the utility model, the floating installation of the product is realized through the glass fiber reinforced plastic component without being interfered by the potential of a nearby conductor; the mortise and tenon mounting structure and process are adopted, the use frequency of bolts is reduced as much as possible, and meanwhile the reliability of equipment in all directions is guaranteed; the reliability of ventilation and heat dissipation of the product is ensured through the optimal design of the air duct; and meanwhile, the product also has multiple functions of wire passing protection, dust prevention, intrinsic safety realization and the like.

The utility model relates to the technical field of welding construction, in particular to a water tank welding construction operation platform which comprises two vertical steel frames vertically arranged on the outer side of a cylindrical water tank to be welded, and a plurality of climbing beam pipes are arranged between the two vertical steel frames at intervals from top to bottom. The two ends of each climbing beam pipe are fixedly installed on the corresponding vertical steel frames respectively, protective frames are fixedly welded to the outer sides of the two vertical steel frames, and a construction space for workers to pass through is formed between the protective frames and the water tank. Spandrel girders are welded on frame bodies on the front side and the rear side of the protective frame at intervals from top to bottom, and a construction platform is arranged between the two spandrel girders located on the same level; according to the water tank welding construction operation platform, a welding construction platform can be provided for welding operation of a large-size cylindrical boiler water tank, an operation standing platform is effectively provided for construction workers, and the stability of the whole structure is effectively guaranteed.

The utility model discloses a dustpan type hopper for door machine ship loading, which belongs to the technical field of dustpan type hoppers, and comprises a hopper and a material pushing component, a slope plate is arranged in a placing groove, rotating rods are arranged on two sides of the slope plate, and the rotating rods are movably arranged in rotating holes. The material pushing component comprises an inverted-U-shaped frame and a moving plate slidably mounted in the bottom end of the inverted-U-shaped frame, a dumper directly moves from the top end of a slope plate to the interior of a hopper for unloading, the use frequency of a loader is reduced, pollution of goods to a platform is reduced, the slope plate has the 10-degree angle, safety is achieved, the control component A and the control component B are started, and the unloading efficiency of the dumper is improved. The control component A winds the rigid rope, the control component B loosens the rigid rope, the connecting rod moves to drive the rolling wheel to roll in the inverted-U-shaped groove, the sliding blocks located on the two sides of the inverted-U-shaped frame move in the limiting groove in a limiting mode, the inverted-U-shaped frame and the movable plate move in the hopper, materials are pushed, and discharging equipment can take the materials conveniently.

The application discloses a kind of offshore box transformer internal environment control system and method, it is related to offshore electrical equipment control technical field, wherein, the system includes box transformer body, partition fan group, shell fan, sensing unit and control unit.Box transformer body is divided into high-pressure chamber and low-pressure chamber by partition, partition fan group is set to partition, shell fan is set to the shell of high-pressure chamber.Control unit is electrically connected with partition fan group, shell fan, sensing unit respectively;Control unit is used to receive the detection data of sensing unit, and according to detection data control partition fan group and shell fan start-stop.This scheme can complete temperature regulation inside box transformer, greatly reduce the invasion of external high salt mist air, while maintaining high protection level, realize efficient heat dissipation, and can realize the timely start of partition fan and shell fan when leakage, quickly discharge low-pressure chamber SF6 gas, eliminate security risks.

This utility model belongs to the field of low-voltage electrical technology and discloses an electromagnetic starter, including a housing assembly, a stop operation button, a thermal relay, and a button assembly. The housing assembly has an installation space; the stop operation button is located on the housing assembly and is used to accept operation to stop the electromagnetic starter; the thermal relay is located in the installation space and has a stop button for stopping the thermal relay and a reset button for resetting the thermal relay; the button assembly is movably located on the housing assembly, with its first end for accepting a pressing operation, and its second end extending into the installation space and having a pushing part that can push against the stop button and the reset button. This electromagnetic starter can reduce the frequency of use of the button assembly for resetting and stopping the thermal relay, optimize the force condition of the button assembly when pressed, and improve the service life of the button assembly and the thermal relay.

The application provides a multi-connected air conditioner and a control method thereof, and relates to the technical field of air conditioners, to solve the problem that air conditioner power is affected by power tension. The multi-connected air conditioner comprises an outdoor unit, an energy storage module and multiple indoor units, the energy storage module is connected in parallel with the indoor units, a four-way valve has first, second, third and fourth ports, and can be switched between the first and second ports being conducted and the third and fourth ports being conducted, and the first and fourth ports being conducted and the second and third ports being conducted, a compressor exhaust port is connected to the first port, an outdoor heat exchanger is connected to the second port and connected to an outdoor expansion valve and a liquid shunt in sequence, a compressor outlet is connected to a high-pressure shunt, the third port is connected to a compressor air inlet and a low-pressure shunt, the fourth port is blocked, and the liquid shunt, the high-pressure shunt and the low-pressure shunt are respectively connected to the multiple indoor units and the energy storage module. The multi-connected air conditioner provided by the application can reduce the influence of air conditioner power on power tension.

The application discloses a frequency-modulated laser pulse spectrum width calibration method and a calibration system based on a traversal correlation algorithm, and belongs to the field of laser signal processing. The frequency-modulated laser pulse spectrum width calibration method draws a first relationship curve between a measured spectrum width and a calibration spectrum width based on measurement data, and finally determines the calibration spectrum width of a subsequent laser pulse to be measured by using the first relationship curve. The application establishes a connection between a medium-precision measurement spectrum and a theoretical simulation spectrum, the calibrated spectrum width more reflects the physical nature of phase modulation relative to the -3dB spectrum width, and the data obtained by the calibration method and the calibration system has strong correlation (R>0.9), high linearity and high confidence, and the data is more reliable. Meanwhile, the calibration method and the calibration system provided by the application reduce the use frequency of a high-precision spectrometer, reduce the use cost, reduce the dependence on high-end instruments, and have high economic value.