18results about How to "Reduce the current value" patented technology

The invention discloses a circuit and a method for detecting disconnection of a switching control loop, and the circuit comprises a switching control switch, a closing loop disconnection detection optocoupler, an opening loop disconnection detection optocoupler, a third current-limiting resistor, and a fifth current-limiting resistor. The other end of the switch-on loop disconnection detection optical coupler is connected to the input end of the input side of the switch-off loop disconnection detection optical coupler; the output end of the input side of the closing loop disconnection detection optocoupler is connected to the negative electrode of the power supply of the circuit breaker operating mechanism after passing through a circuit breaker closing contact and a closing coil; and the output end of the input side of the opening loop disconnection detection optocoupler is connected to the negative electrode of the power supply of the circuit breaker operating mechanism after passing through the circuit breaker opening contact and the opening coil. The on-off state of the control loop disconnection detection circuit can be adjusted according to needs through the on-off switch, on-site maintenance is facilitated, and timely detection of control loop disconnection can be achieved.

The invention discloses a silicon-based OLED self-induction brightness adjustment display structure and a manufacturing method thereof, and relates to the technical field of silicon-based OLEDs, the silicon-based OLED self-induction brightness adjustment display structure comprises a light induction module, a first organic light-emitting layer and a second organic light-emitting layer, and the light induction module and a control circuit of the first organic light-emitting layer are electrically connected with a control module; the light sensing module is used for detecting the light intensity of the external environment in real time, when the light intensity of the external environment is large, the first organic light-emitting layer and the second organic light-emitting layer are both in the on state, and when the light intensity of the external environment is small, the second organic light-emitting layer is in the on state, and the first organic light-emitting layer is in the off state. The display definition of the screen watched by the human eyes is effectively improved, the display brightness value of the screen is adjusted according to the ambient brightness, the damage to the human eyes is reduced, meanwhile, the power consumption used in the environment without high brightness is reduced, due to the arrangement of the two organic light-emitting layers, when one layer fails, the other layer can be used, and the service life is long.

The invention belongs to the technical field of wind power generation, and particularly provides a semi-direct-drive direct-current type wind turbine generator based on a multi-winding transformer and a control method.The wind turbine generator comprises an impeller and the multi-winding transformer, and the impeller is connected with a wind driven generator through a gearbox; the output end of the wind driven generator is connected with a primary winding of the multi-winding transformer, and each secondary three-phase winding of the multi-winding transformer is connected with an electric energy conversion unit through a three-phase alternating-current circuit breaker; the anode output end of each electric energy conversion unit is used as a first electrical interface of the electric energy conversion unit after passing through a direct current circuit breaker; the cathode output end of each electric energy conversion unit passes through a direct current circuit breaker and then is used as a second electrical interface of the electric energy conversion unit; a bypass switch is connected between the first electrical interface and the second electrical interface of the same electric energy conversion unit; the output ends of the electric energy conversion units are connected in series. No circulating current problem exists, and the output voltage grade of the wind turbine generator is improved.

The utility model provides a power gating circuit and a chip, which belong to the technical field of semiconductor circuits, and comprise a first gating link used for controlling the chip to be pre-electrified; the first gating link comprises a first control signal input end and a plurality of first gating units, power supply pins of the plurality of first gating units are connected in parallel, switching signals of the plurality of first gating units are connected in series, and the switching signals of the first gating units are connected with the first control signal input end; at least one delay unit is connected in series between every two adjacent first gating units, and the delay units are used for controlling the current change rate in the chip power-on process. According to the utility model, the current change rate generated when the first gating unit in the first gating link is opened is reduced through the time delay unit, and the power supply stability of the whole power supply system is improved.

A vertical cavity surface emitting laser that has both reduced divergence angle and heat dissipation belongs to the field of semiconductor optoelectronics. The laser includes: an n-type electrode, a GaAs substrate, an n-type Bragg reflector, an n-spacer layer, a quantum well structure, a p-spacer layer, a p-type Bragg reflector, an oxidation restriction layer located at the bottom of the p-type Bragg reflector, an isolation layer, a p-type electrode, and a heat dissipation mechanism. The present invention provides a heat dissipation mechanism, and the heat dissipation mechanism is prepared in the light-emitting area, or prepared outside the light-emitting area, or prepared in the light-emitting area and outside the light-emitting area at the same time. Through reasonable design, different temperature difference distributions inside the device can be obtained, and the temperature difference causes the refractive index difference of the material to change, so as to obtain different waveguide effects, and a device with a smaller divergence angle can be obtained, and the thermal performance of the device is significantly improved. The present invention solves the problem that the etching of the upper DBR layer affects the reliability of the device during the preparation of the VCSEL, and also solves the heat dissipation problem of high-power VCSEL.

The utility model relates to the technical field of wireless sensor networks, and discloses a data collection device based on an industrial wireless sensor network, which comprises a box body, a side plate, a circuit board, a data receiver, a data processor, a data transmitter, an interface and the like, a thermistor is fixedly connected on the circuit board, an electromagnet is arranged inside the side wall of the box body, and the data receiver is connected with the thermistor. And a movable cavity is formed in the box body. When the temperature inside the data collection device is high, the temperature inside the data collection device can be sensed by the thermistor, the resistance value of the thermistor is reduced along with the rise of the temperature, the current of a circuit where the electromagnet is located is increased, the magnetic force of the electromagnet is increased, and at the moment, the electromagnet adsorbs the sliding plate; after the partition plate slides down, the through holes are opened, air convection is formed between the through holes in the two sides of the box body, and then heat dissipation in the box body is accelerated.

The invention discloses a graphene composite metal wire electrode and a preparation method and application thereof, and belongs to the technical field of electrode materials. The graphene composite metal wire electrode provided by the invention comprises a metal wire, a gold layer and a vertical graphene layer, at least one part of the gold layer is coated on the surface of the metal wire; the surface of the gold layer is coated with at least one part of the vertical graphene layer, and the two-dimensional plane direction of the vertical graphene layer is perpendicular to the gold layer. Through cooperation of the metal wire, the gold layer and the vertical graphene layer, the obtained graphene composite metal wire electrode has low low-frequency impedance, high electron transfer rate and good sensing performance, and particularly, the electrochemical performance of the electrode is effectively enhanced by adopting the vertical graphene layer for modification; the graphene composite metal wire electrode is especially suitable for dopamine detection, can detect dopamine at a low peak potential, and has the characteristics of high sensitivity, good stability and strong anti-interference capability.

A circuit supporting multiple groups of fast charging protocols and having a data communication function is characterized by comprising an interface circuit unit, a voltage induction and identification circuit unit, a charging / communication switching circuit unit, a charging state management circuit unit and a data communication control circuit unit, the input end of the interface circuit unit is electrically connected with a plug of a USB-TYPE-C cable, the output end of the interface circuit unit is connected with the input end of the voltage induction and identification circuit unit, the interface circuit unit is connected with the input end of the charging / communication switching circuit unit, the charging / communication switching circuit unit is connected with the data communication control circuit unit, and the data communication control circuit unit is connected with the USB-TYPE-C cable. The output end of the data communication control circuit unit is electrically connected with a serial port of the single-chip microcomputer, the input end of the charging state management circuit unit is connected with the output end of the voltage induction and identification circuit unit, and the output end of the charging state management circuit unit is connected with the battery. And adaptive selection of a quick charging function and a data communication function is realized.

The application provides a flexible fusion arc-extinguishing device with phase power series voltage division. The topological structure is a structure in which a phase power and a single-phase converter are connected in series through an isolation transformer, wherein the phase power is obtained through switching and voltage boosting of a secondary winding of a grounding transformer and voltage boosting of a voltage transformer, the single-phase converter is connected in series with the phase power through the isolation transformer, and a DC side power supply of the single-phase converter is provided through rectification of the secondary winding of the grounding transformer by a rectifier. The control algorithm of the flexible fusion arc-extinguishing device is that the phase power is controlled as a voltage source, and the single-phase converter is controlled as a current source. The technical scheme makes up for the deficiency of the voltage arc-extinguishing method that the fault current compensation effect is not obvious in low-resistance grounding fault, and has good engineering application value.

The present application relates to a noise reduction method and control circuit for a fuel heater plunger pump. The noise reduction method for a fuel heater plunger pump comprises the following steps: detecting the current value of the electromagnet of the plunger pump, calculating the current difference between the current value and the calibrated current value; if the current difference is greater than a preset value, adjusting the voltage of the electromagnet according to the current difference; repeating the above steps until the current difference is less than or equal to the preset value. The above-mentioned noise reduction method and control circuit for the fuel heater plunger pump detects the current value of the electromagnet of the plunger pump, and when the current difference between the current value and the calibrated current value exceeds a preset value, adjusts the voltage of the electromagnet according to the current difference, thereby reducing the current difference to less than or equal to the preset value, achieving a substantially constant suction force of the electromagnet, thereby improving the problem of increased noise of the plunger pump due to changes in the suction force of the electromagnet.

The embodiment of the invention discloses a multi-channel clock signal output circuit, which is characterized in that a phase-locked loop is arranged in the multi-channel clock signal output circuit, and a signal output module outputs a sampling signal at the moment when a feedback clock signal reaches a half signal period to the phase-locked loop; the phase difference of sampling signals output by two adjacent signal output modules is locked at a preset angle through a phase-locked loop, and a control signal is output to each signal output module according to the locked phase difference, so that the phase difference of clock signals output by the two adjacent signal output modules is kept at the preset angle. Therefore, conduction moments of different switching circuits are controlled, simultaneous conduction of adjacent switching circuits is avoided, the current value of ripple current is reduced, and the technical problem that the ripple current is too large due to the fact that multiple output channels are integrated on a bare chip in the prior art is solved.

The present invention relates to a processing system and method for dealing with line leakage in DC lighting power supply. A DC power supply cabinet, a power supply cable, a DC-DC driver and a lamp constitute a processing system for dealing with line leakage in a DC lighting power supply system. The DC-DC driver converts the input DC power into the voltage and current required by the lamp. The DC-DC driver includes an MCU microprocessor and an input voltage detection circuit, a PWM conversion circuit, a PWM control circuit, an input-end fault feedback circuit and an output-end fault feedback control circuit connected to the MCU microprocessor. Since the DC system is sensitive in protection, line leakage can easily cause overload protection of the DC system, resulting in lamp extinguishing. The present invention detects the input voltage by a DC-DC driver, adaptively adjusts the output power, and reduces the load change of the DC power cabinet by reducing the load power of the lamp when the line leaks, thereby greatly reducing the probability of its overload protection.

This invention discloses a tumor electric field therapy device and system. The tumor electric field therapy device consists of a frame and electrode modules. The frame forms the skeleton structure of the therapy device, and the electrode modules are attached to the frame. Each electrode module has several electrode contacts, and each electrode contact can be either an active or passive contact. The active contacts can form a circuit with a radio frequency generation module. When the therapy device is implanted into the tumor resection site, all electrode contacts become active contacts, and each electrode contact forms a circuit with the radio frequency generation module, distinguishing between normal tissue and diseased tissue. After distinguishing between normal tissue and diseased tissue, the electrode contacts in the normal tissue area become passive contacts, and the electrode contacts in the diseased tissue area become active contacts, enabling targeted treatment of the diseased tissue and thus reducing the side effects of electric field therapy.

The invention provides a novel electrochemical sensor for detecting CREG1 based on a surface molecular imprinting technology and a preparation method of the novel electrochemical sensor. Comprising the following steps: step 1, preparing a reagent solution required in a manufacturing process; step 2, polishing the glassy carbon electrode (GCE); 3, AuNPs / GCE is prepared; step 4, preparing CREG1 / GA (at) CS / AuNPs / GCE; step 5, preparing MIP / GA (at) CS / AuNPs / GCE; and step 6, scanning in the redox probe solution by adopting a differential pulse voltammetry (DPV), and determining the content of the CREG1. According to the invention, CREG1 protein is selected as a detection template, and a molecularly imprinted polymer is combined with gold nanoparticles through a surface polymerization method to prepare a corresponding western blot material. Gold nanoparticles are used as a matrix, CREG1 is used as a template, GA (at) CS is used as a protein fixing agent, and polyphenol is used as an imprinted polymer to prepare a surface imprinted material, and the surface imprinted material is measured by measuring the change of sensor current before and after the combination of a molecularly imprinted membrane (MIP) and CREG1. According to the present invention, the surface molecular imprinting technology and the electrochemical sensing technology are combined to construct the high-sensitivity and high-specificity CREG1 sensor, and the high-sensitivity and high-specificity CREG1 sensor is the novel surface molecular imprinting electrochemical sensor with good biocompatibility, can simply, conveniently and rapidly recognize the CREG1 protein at a low cost, and has characteristics of high sensitivity and high sensitivity. In addition, the method can also be used as a universal sensing platform to be suitable for other proteins.

The invention provides a transformer core multipoint grounding equivalent circuit and a fault processing method, and relates to the technical field of power transformers. The equivalent circuit comprises a primary side equivalent branch, a secondary side equivalent branch, a fault equivalent branch, a current-limiting resistor and an insulation resistor, one ends of the primary side equivalent branch and the secondary side equivalent branch are connected with the ground, and the other ends are connected with the ground through insulation resistors; one end of the fault equivalent branch is connected with the ground through a current-limiting resistor, and the other end is connected with the ground through an insulation resistor; and the fault equivalent branch is equivalent to a secondary winding and is used for equivalent induction electromotive force generated by multi-point grounding of the iron core. The multi-point grounding condition of the transformer core can be simulated, and the selection accuracy of the resistance value of the current-limiting resistor is improved.

The invention provides a switch indicator lamp internal circuit in an electronic parking brake system. The switch indicator lamp internal circuit comprises a switch control module and a switch indicator lamp module. A first port of the switch control module is connected with a second port of the switch indicating lamp module; the switch control module is used for controlling a switch of the electronic parking brake system; the switch indicating lamp module is used for indicating the on-off state of the electronic parking brake system; the switch indicating lamp module comprises a current control resistor, and the current control resistor is used for determining that the current in the switch indicating lamp module is smaller than a preset threshold value under the condition that the switch is turned off. According to the switch indicator lamp internal circuit in the electronic parking brake system, the current control resistor connected in parallel with the light-emitting diode is additionally arranged in the switch indicator lamp module, and it can be guaranteed that the value of the current passing through the light-emitting diode on the circuit is smaller than the preset threshold value under the condition that the switch is turned off; therefore, the switch indicating lamp is in an off state.

The invention relates to the technical field of display screens, and discloses an outdoor display brightness adjusting device, method and equipment. The method is applied to the display device, the display device comprises a plurality of display areas, each display area comprises at least two LED lamp beads, and the method comprises the steps that the external light intensity of the place where the display device is located is obtained; the rated working current corresponding to the LED lamp beads in each display area is determined; determining a corresponding current upper limit value according to the rated working current and a preset proportionality coefficient; and finally, based on the current upper limit value and the external light intensity, determining the working state corresponding to each LED lamp bead so as to adjust the display brightness of the display equipment. According to the invention, the display screen is divided into the display areas, and the current upper limit value and the working state of each lamp bead in each display area are respectively determined based on the acquired ambient light intensity, so that the brightness of the display screen is flexibly adjusted, and the problem of black screen or yellowing caused by full-load working of part of lamp beads is avoided.

The invention discloses self-driven current limiting equipment, and relates to the technical field of current limiting equipment, the self-driven current limiting equipment comprises a reactor and a self-driven device, the self-driven device comprises a vacuum arc-extinguishing chamber, a pull rod, a repulsion disc and a main coil, a static contact and a moving contact are arranged in the vacuum arc-extinguishing chamber, and the moving contact and the static contact are contacted and separated. Closing and opening of the circuit can be realized respectively; the moving contact is directly or indirectly arranged on the pull rod, the moving contact is movably arranged in the vacuum arc-extinguishing chamber, the repulsion disc is directly or indirectly arranged on the pull rod, when current flows through the main coil, the repulsion disc can be repelled, so that the repulsion disc is displaced, the main coil is electrically connected with the moving contact, and the input end of the reactor is electrically connected with the main coil. And the output end of the reactor is electrically connected with the static contact. According to the invention, the timeliness of circuit opening of the current limiting equipment is improved.