10 results about "Milliampere" patented technology

The invention relates to a synchronous rectification protection circuit and a control method of a power supply device. The circuit comprises a control chip, a semiconductor power switch tube and a protection branch. The control chip is provided with a voltage detection pin and a grounding pin, wherein the grounding pin is connected to a reference ground. The grid electrode of the semiconductor power switch tube is controlled by the control chip, and the source electrode is connected to the reference ground. The protection branch is connected between the voltage detection pin and the grounding pin and is composed of a Schottky diode and a current-limiting resistor which are connected in series. When the potential of the voltage detection pin is lower than that of the grounding pin, the Schottky diode is conducted in the forward direction, the voltage difference between the voltage detection pin and the grounding pin is limited to the forward conduction voltage drop level of the Schottky diode, and meanwhile the current limiting resistor limits the value of current flowing through the protection branch circuit to be in the milliampere magnitude. Through the Schottky diode clamping structure and the resistor current limiting structure which are connected in series, negative voltage protection of the control chip is achieved, and meanwhile the advantages of being low in cost, small in occupied area, high in reliability and the like are achieved.

The invention relates to the technical field of stamping and stretching, in particular to a stretching forming method of a connecting piece. The thickness of the connecting piece is T, and the volume of the product convex hull is V. The stretching forming method of the connecting piece comprises the following steps that S1, the connecting piece is stretched upwards so that a stretching convex hull can be formed on the connecting piece in a stretching mode, and the volume of the stretching convex hull ranges from 1.8 V to 2.5 V; s2, the stretching convex hull is extruded at least twice so that the outer diameter and the height of the stretching convex hull can be reduced, a compressed convex hull can be formed, and the size of the compressed convex hull ranges from 1.05 V to 1.15 V; and S3, the inclination angle of the side wall of the compression convex hull and the height of the thickness compression convex hull are shaped till the compression convex hull forms a product convex hull, the side wall of the product convex hull is T1, and T1 is larger than or equal to 0.8 T and smaller than T. And the thickness of the side wall of the product convex hull of the connecting sheet is more than 80% of the thickness of the connecting sheet, so that the resistance after the connecting sheet is electrically connected with the pole and the battery cell is less than 0.5 milliamperes.

The invention provides an electron / ion double-conductor paste additive and a preparation method and application thereof, and belongs to the technical field of lithium batteries. According to the invention, the polymer with high ion conduction performance is grafted on the carbon material with high electron conduction performance, so that electron and ion mixed conduction is realized, and the rate capability of the battery cell is improved. Experimental results show that the initial charge specific capacity of a battery assembled by the electron / ion double-conductor slurry additive is 318.4-334.6 milliampere-hour / g, and the initial discharge specific capacity of the battery is 288.1-301.8 milliampere-hour / g.

The application discloses a flexible printed circuit board large current transmission method in a weak magnetic environment. The method comprises the following steps: designing a wiring structure, decomposing a current loop into an array form, and arranging in high symmetry; planning a flexible PCB laminated structure, designing a line width, a wiring spacing, a geometric size and the like according to the determined wiring structure, and connecting current conductors of different layers by using a via; and according to the structure and function of a transmission object, completing electrical connection, connecting the current connection of the completed wiring design to a solder pad, a connector and the like, forming electrical connection, and completing current transmission. The application can be applied to a large current in a weak magnetic environment, can reduce a magnetic field of a hundred-milliamperes current to a nanotesla order of magnitude, and has the functions of complex structure design and electrical connection.

The invention discloses a distributed photovoltaic output fitting system and method, and aims to solve the problems of insufficient acquisition means and low output measurement and calculation precision of a dispatching automation system after distributed photovoltaic grid connection. The system comprises a capacity statistics module, a template selection module, a data acquisition module, a data transmission module and an output fitting module. The method comprises the following steps: determining a sample substation by counting county-level regional distributed photovoltaic grid-connected capacity, deploying a micro-meteorological acquisition device in the sample substation, transmitting temperature, humidity and irradiance data to a 5000 scheduling system through a 4-20 milliampere interface, and then determining the grid-connected capacity of the distributed photovoltaic grid-connected system on the basis of correlation characteristics of photovoltaic output and meteorological parameters. And fitting and measuring 10-kilovolt and 380-volt distributed photovoltaic output in combination with tracking 110-kilovolt power station data and an algorithm containing multiple correction terms. According to the method, the blank of distributed photovoltaic monitoring is filled, the measurement and calculation precision is improved, the method is compatible with existing power grid equipment, the implementation cost is reduced, support is provided for power grid precise scheduling and new energy efficient consumption, and the method has important engineering application value.

The utility model specifically relates to a double-path high-precision small current acquisition circuit, comprising a voltage conversion circuit, the voltage conversion circuit is connected with a processor circuit and an acquisition amplification circuit, the acquisition amplification circuit is connected with a power circuit through a sampling resistor, and the acquisition amplification circuit is also connected with the processor circuit; the voltage conversion circuit is also connected with the input end of a power supply Vin, the sampling resistor is also connected with a power supply, and the power circuit is also connected with a driving power supply and a load; according to the utility model, by selecting the acquisition amplification circuits with different amplification factors and the sampling resistors with different resistance values, the acquisition of two paths of milliampere-level or ampere-level current is realized; the problems that in the power utilization field of an existing power system, a signal amplification circuit built through multi-stage filtering and an operational amplifier is complex in circuit and high in cost when used for collecting small current signals are solved, and the effects of being small in occupied space and saving cost are achieved.

The invention discloses a micro-current detection circuit and method for a large-current load switch, the circuit comprises an operational amplifier, a first power tube, a second power tube and a current detection module, the operational amplifier is electrically connected with the first power tube, and the source electrode and the drain electrode of the first power tube and the source electrode and the drain electrode of the second power tube are connected in parallel. The first power tube and the second power tube are connected together between a power supply node and an output node, the proportional relation between the width-to-length ratio of the first power tube and the width-to-length ratio of the second power tube is N: 1, N is an integer which is far greater than 1, a grid electrode of the second power tube is electrically connected with the current detection module, so that the second power tube and the current detection module form a current mirror with the proportion of K: 1, and K is an integer which is far greater than 1. According to the scheme, through an innovative circuit architecture, the power tube can realize accurate detection of milliampere-level micro-current while having ampere-level large-current through-current capacity, so that the problem of detection precision degradation caused by great disparity of scale factors of a traditional current mirror architecture is solved.

The invention discloses a charging system and a charging control method, and relates to the technical field of charging. The charging system includes a first electronic device and a second electronic device. The first electronic equipment comprises a first switch, a first charging chip, a first battery, a second switch and a load. The second electronic device comprises a third switch, a fourth switch, a direct current voltage regulating module and a second battery. In the charging system, the second battery in the second electronic equipment can supply power to the load of the first electronic equipment through the fourth switch and the second switch. As the current of the load of the first electronic equipment during normal working is relatively small and is generally dozens of milliamperes, the discharge current of the second electronic equipment can be reduced under the condition, so that the second electronic equipment can perform deep discharge, and the endurance of the first electronic equipment is further improved.

This invention discloses a wide-range current measurement dynamic compensation method and system for excitation system testing, belonging to the technical field of excitation system technology. This invention acquires the temperature of key chips in the signal conditioning module in real time, dynamically calculates zero-point offset and actual gain based on factory calibration parameters, performs digital filtering and noise reduction on the acquired voltage signal, and uses a single-iteration approximation method to complete initial current estimation and nonlinear correction, achieving full-range dynamic error compensation. The system includes a signal conditioning and acquisition module, a temperature acquisition module, a dynamic compensation processor, and an output module. This invention overcomes the shortcomings of traditional testing devices such as manual range switching, static calibration lag, and low accuracy at low currents. It can achieve continuous high-precision measurement over a wide range from milliamperes to tens of amperes, effectively suppressing temperature drift, noise, and nonlinear errors, significantly improving testing efficiency and stability, and is suitable for on-site maintenance and commissioning of hydropower station excitation systems.

The utility model provides a three-proofing mobile phone high-capacity FPC (Flexible Printed Circuit) anti-breakage fast-charging battery, which relates to the technical field of fast-charging batteries and comprises a three-proofing mobile phone main body, a fast-charging battery main body is fixedly adhered inside the three-proofing mobile phone main body, and the performance of the three-proofing mobile phone is improved by adopting an L-shaped bent line. A large-capacity battery exceeding 20000 milliamperes is adopted, a 120 W fast charging technology is supported, meanwhile, the thickness of an FPC (flexible printed circuit board) is increased to 0.25 mm, the width of the FPC is widened to 7 mm, the thickened and widened FPC can become relatively hard, the due flexibility characteristic of a flexible board is lost, the FPC is difficult to be smoothly attached to a complex space in equipment, and the problem that the thickness of the FPC is too large is solved. In the prior art, a mobile phone is easy to be folded, deformed and even fractured due to improper operation, the internal structure of the mobile phone needs to be redesigned in order to accommodate a hardened FPC (Flexible Printed Circuit), the original limited assembly space is occupied, and the mobile phone is undoubtedly a severe challenge for a three-proofing mobile phone pursuing a compact layout.