5results about How to "Avoid potential difference" patented technology

The invention relates to the technical field of semiconductor devices, and discloses a wide bandgap power semiconductor device and a preparation method thereof. The method comprises: providing a substrate layer of a first conductivity type; forming a first doped region which is deep into the substrate layer and comprises a plurality of doped layers which are sequentially nested from outside to inside, wherein the doping concentrations of the plurality of doped layers are sequentially increased from outside to inside; forming a second doped region in the doped layer on the innermost side of the first doped region; forming an isolation layer on the first surface; forming a control electrode on the isolation layer; forming a first electrode on the first surface; a second electrode is formed on the second surface of the substrate layer. According to the invention, the first doped region which is located between the substrate layer and the second doped region and has the doping concentration gradually increased from outside to inside is formed through a mode of multiple times of ion implantation, so that transverse electric field constraint is constructed, transverse depletion of a channel region and a short channel effect under the condition of large voltage are inhibited, the channel width is reduced, and the performance of the device is improved. And the device performance and reliability are improved.

The invention provides a tunnel geological detection system and method, a storage medium and a computer program product. The system comprises a current source, an emission electrode, a shielding electrode, a backflow electrode, a differential pressure signal measurement module and an acquisition control module. The acquisition control module controls the current source to output current to the emission electrode in a first working mode and controls the current source to output current to the shielding electrode in a second working mode according to the electric field synthesis proportional parameters, so that the emission electrode emits current to a target stratum under the action of electric field superposition, the resistivity determination module is used for determining apparent resistivity corresponding to a target stratum; wherein under the condition that the emission electrode emits the current to the target stratum, the voltage difference information is smaller than the voltage difference threshold value. According to the invention, the measurement precision of the apparent resistivity can be improved, and an accurate geological forecast result is provided; moreover, related hardware circuits do not need to be installed, the tunnel excavation equipment has the tunnel geological detection function, implementation is easy and convenient, and the cost can be reduced.

The utility model provides a kind of tubular motor mechanical resistance rebound control circuit, including circuit board and motor, and is equipped with main control module, power module, motor drive module on circuit board, motor drive module includes motor interface, and the middle shaft of motor is equipped with bump block, and microswitch matched with bump block is set on circuit board, and the trigger signal of microswitch is output by motor interface, and power module is for motor, main control module and motor drive module power supply, still include resistance detection filter circuit, resistance detection filter circuit includes diode D1 and photoelectric coupler OP1, the positive pole of diode D1 is connected with the trigger signal output by motor interface, and the negative pole of diode D1 is connected with the input end of photoelectric coupler OP1 with RC filter circuit, the collector of the output end of photoelectric coupler OP1 is connected with the output end of power module by pull-up resistor R4, the collector of the output end of photoelectric coupler OP1 is connected with the signal input end of main control module, and the emitter of the output end of photoelectric coupler OP1 is grounded.

The invention discloses a charging device, and belongs to the technical field of electronic equipment. The charging device comprises a connector which is used for being connected to a power supply, the connector comprises a detection pin and a connection port, and the connection port is used for being connected with a transmission piece; the control circuit is arranged on the connector, and the control circuit is connected to the detection pin and the connection port; wherein under the condition that the connector is connected to a power supply, the control circuit is used for controlling the level state of the detection pin according to the connection state of the connection port and the transmission piece and the level state of the detection pin.

The invention discloses a thermal spraying clamp with ultrasonic vibration, and relates to the technical field of thermal spraying, the thermal spraying clamp comprises two supporting legs, a workbench is fixedly mounted on the top surfaces of the two supporting legs, a distribution box is fixedly mounted on the front side wall of the workbench, and a controller is fixedly mounted on the top surface of the workbench; a vibration guide rail is fixedly installed at the center of the top face of the workbench, limiting blocks are fixedly installed at the two ends of the vibration guide rail, and a movable plate is slidably connected to the vibration guide rail. The clamping mechanism is arranged on the moving plate, the clamping mechanism comprises two semi-arc plates, and the two semi-arc plates are connected to the top face of the moving plate in a sliding mode. Through the design of the insulating mechanism and the purifying assembly, the problems of potential difference, uneven coating distribution and the like existing in the workpiece spraying process are solved; and cyclic utilization of resources and environment-friendly production are achieved, the overall efficiency and quality of spraying operation are remarkably improved, and remarkable technical progress and economic benefits are achieved.