149results about How to "Increase load carrying capacity" patented technology

The invention discloses a route exchange method suitable for a GEO / LEO double layered constellation network. According to the method, a system period is divided into equal-duration time sections based on a dynamic boundary value; a GEO layer satellite high in on-board processing capacity is used for calculating the best route and the second best route for each LEO satellite; in the processes of information transmission and exchange, when loads of the LED satellites are large, the GEO satellite shares part of low priority services in time for the LED satellites, and it is guaranteed that important information is reliably transmitted in real time; when link congestion, node ineffectiveness and other emergency conditions happen in the satellite network, in order to avoid rerouting of the whole network, and the GEO satellite only calculates rerouting for affected routes; after link congestion is eliminated, the LED satellites recover route information in time before congestion in order to avoid link resource waste in the network. In the network that topology time varying happens, links are prone to congestion, on-board resources are limited, continuous high-load flows are prone to being generated, and nodes are prone to being ineffective at the special period, the method can reduce constellation system cost, shorten convergence time, save the on-board resources, increase the utilization rate of the link resources, guarantee that important information is reliably transmitted in real time and improve invulnerability and robustness of the satellite network.

The invention discloses a pneumatic soft mechanical hand and a manufacturing method. The split type design scheme is adopted in the soft mechanical hand, the soft mechanical hand is divided into a corrugated pipe installation part and a bottom plate part, and the soft mechanical hand is manufactured by adopting the split type casting technology. After the two parts are machined and manufactured correspondingly, the two parts are bonded together by the adoption of special silica gel adhesive. The performance of the soft mechanical hand depends on the self structure and the solidifying formationquality of silica gel. In the actual soft mechanical hand manufacturing process, by constantly improving a casting die and the finger manufacturing technology, a set of complete manufacturing technology is formulated, and the machining quality of the soft mechanical hand is ensured.

The invention relates to a solution to a working power supply and the power of a two-wire-system electronic switch, relating to the field of illuminating electronic switches. The two-wire-system electronic switch comprises an off-state electrification circuit, a switch executive circuit, an on-state electrification circuit, and the like, wherein when loads are closed, the off-state electrification circuit supplies working electric energy for the electronic switch and also eliminates the sparkling phenomenon of a load lamp; the switch executive circuit is used for executing the starting or the closing of the loads, not only has low power consumption, but also provides the switch state indication; and when the loads are started, the on-state electrification circuit provides a heavy current path for the loads and also supplies the working electric energy for the electronic switch. The invention not only solves the problem on the working power supply of the two-wire-system electronic switch, but also enhances the loading capacity of the two-wire-system electronic switch.

The embodiment of the present invention provides an NSGA-II algorithm-based multi-objective optimization method for a mechanical arm in a redundant space. The method comprises the steps of converting the point-to-point transfer task of the mechanical arm in the operating space from a Cartesian space into a joint space, conducting the parameterized treatment on joint variables based on the sine seven-times polynomial interpolation method, adopting an obtained parameter sequence code as an individual in an NSGA-II algorithm-based population, figuring out an optimized solution for the motion trajectory of the mechanical arm based on the NSGA-II algorithm to enable the sum of the average values of all joint torques to be minimum, the torque of a largest joint to be minimum and the maximum angular velocity of joints to be minimum, and selecting a most optimal solution out of an obtained pareto non-dominated solution set. Based on the above method, the sum of the average values of all joint torques, the torque of the largest joint and the maximum angular velocity of joints are optimized according to the described motion trajectory. According to the technical scheme of the invention, when the point-to-point transfer task is executed in the operating space with the constraint conditions of the task to be met, multiple objects of the mechanical arm can be optimized at the same time according to the above described planning path.

The invention relates to a large-stroke quick-response X-Y micro-motion workbench with double displacement magnification. The workbench comprises a pedestal, a motion platform, a top cap, leveling screws, piezoelectric ceramics, an object stage, capacitive displacement sensors, and the like, wherein the pedestal, the motion platform, and the top cap are fixed through screws; the piezoelectric ceramics are installed in displacement magnifying mechanisms and are tightly locked by screws; and the capacitive displacement sensors are installed between the object stage and rounding straight-beam flexible hinges. Improved parallelogram displacement magnifying mechanisms applicable to micro-nano structures are adopted in the workbench; joint parts of the mechanisms are connected by round flexible hinges; and the stiffness of the mechanisms determine the loading capability and quick response of the displacement magnifying mechanism. Two displacement magnifying mechanisms are connected in parallel, so that output force and output displacement are doubled, and displacement coupling of the object stage is reduced. A symmetrical structure is adopted in the micro-motion workbench to provide the workbench with relatively high bandwidth and repeated accuracy. A combination structure of rounding straight-beam and parallel-board flexible hinges is adopted, so that the micro-motion workbench is good in unidirectional displacement.

The invention discloses a current feedback operational amplifier circuit comprising a power supply, a bias current supply unit, a first common base-common emitter current mirror, a second common base-common emitter current mirror, a static bias circuit, an input buffer stage, a voltage conversion stage and a drive output unit, wherein the drive output unit comprises a bias voltage circuit and an output buffer stage; the bias current supply unit is respectively connected with the input buffer stage through the first common base-common emitter current mirror and the second common base-common emitter current mirror and used for supplying bias current; and the static bias circuit is respectively connected with the inverted input end of the input buffer stage and the voltage conversion stage and used for stabilizing a static working point of the inverted input end. The current feedback operational amplifier circuit has the advantages of lower offset voltage, stronger on-load capacity and higher conversion rate and is beneficial to improvement of the precision and the linearity of the entire operational amplifier.

The invention discloses programmable device-based signal conversion equipment, which comprises a communication interface module, a control module, an LVDS image demodulating module, an SERDES image demodulating module, an SERDES image sending module, an RGB converting module, an SERDES image transmitting and packaging module, an LVDS converting module, an MIPI converting module, a TTL interface module and extended interfaces. The signal conversion equipment is designed based on a programmable device and is compatible with LVDS signals, DP signals, MIPI signals, LVDS signals and TTL signals to realize the signal conversion from LVDS signals to DP signals / MIPI signals / LVDS signals / TTL signals. The output signals of the signal conversion equipment can be expanded and applied to signal sources required for multiple tests on modules. Meanwhile, the signal conversion equipment enables the signal cascading function and realizes the cascading function of SERDES signals and the converting function of TTL signals to DP video signals. Therefore, the extensibility of the signal conversion equipment is realized.

The invention discloses a copper consumption minimization-based axial magnetic field flux-switching fault-tolerant motor fault-tolerant control method. With the copper consumption minimization-based axial magnetic field flux-switching fault-tolerant motor fault-tolerant control method of the invention adopted, an axial magnetic field flux-switching fault-tolerant motor can operate under a fault-tolerant state when a single-phase open-circuit fault occurs on the axial magnetic field flux-switching fault-tolerant motor, and the copper consumption of the motor can be minimized. An inverter adopts a three-phase four-bridge alarm fault-tolerant topology and judges a fault state according to phase current; when operation is normal, the inverter operates under a three-phase three-bridge arm mode, an axial magnetic field flux-switching fault-tolerant motor control system adopts an SVPWM (Space Vector Pulse Width Modulation) control strategy according to which id=0, so as to distribute d-axis current and q-axis current; and when a single-phase fault occurs, fault-tolerant control is performed, the inverter operates under a two-phase three-bridge arm mode, and magnetizes the motor through controlling the current of a fault-tolerant winding, so that the overall copper consumption of the motor can be minimized. According to the copper consumption minimization-based axial magnetic field flux-switching fault-tolerant motor fault-tolerant control method of the invention, under the single-phase open-circuit condition, and with minimizing the copper consumption adopted as an optimization objective, the motor is switched from a fault state to a fault-tolerant control state, and therefore, the reliability of a motor driving system and the operation efficiency of the motor under the fault-tolerant state can be effectively improved.

The invention relates to the field of wall-climbing robots, in particular to a negative pressure adsorption type biomimetic wall-climbing robot. The negative pressure adsorption type biomimetic wall-climbing robot comprises a skeleton, walking devices, an adsorption device, a control circuit, four pressure sensors, a stepping motor and an ultrasonic wave sensor, wherein the walking devices are installed at the two sides of the skeleton and used for the wall-climbing robot to move; the adsorption device comprises a mini vacuum pump, four adsorption plates and air valves, and the adsorption device is used for the wall-climbing robot to be adsorbed on a wall face; the control circuit comprises a shell, a PCB plate, a CPU, a servomotor controller, an electromagnetic valve, a voltage stabilizing circuit, an LED state indicator lamp, a wireless transmission module, an antenna, a dial switch and a tilt angle sensor, and the control circuit is installed in the middle on the skeleton and used for controlling and adjusting the working state of the wall-climbing robot. The negative pressure adsorption type biomimetic wall-climbing robot is strong in environmental adaptation, high in intelligent degree, strong in loading capacity, good in stability and capable of allowing to simultaneously control the work of multiple wall-climbing robots and improving the working efficiency.

The invention discloses a rail-to-rail differential input circuit which comprises a PMOS differential pair, an NMOS differential pair, a PMOS switch tube, an NMOS switch tube, a PMOS current source, an NMOS current source, a PMOS current mirror and an NMOS current mirror. The currents output by the PMOS current source and the NMOS current source are equal, and the PMOS current source comprises a first PMOS transistor and a second PMOS transistor, wherein the first PMOS transistor and the second PMOS transistor form a cascade structure. The NMOS current source comprises a first NMOS transistor and a second NMOS transistor, wherein the first NMOS transistor and the second NMOS transistor form a cascade structure. According to the rail-to-rail differential input circuit, the tail current precision can be improved, and the better constant transconductance effect can be achieved.

The invention discloses an electric locomotive electronic mutual inductor and an application method thereof. The mutual inductor comprises a voltage dividing circuit, an overvoltage protection circuit, a high voltage side photoelectric isolation processing unit circuit and a low voltage amplification circuit, wherein the output end of the voltage dividing circuit is connected with the input ends of the overvoltage protection circuit and the high voltage side photoelectric isolation processing unit circuit; the overvoltage protection circuit is grounded; the output end of the high voltage side photoelectric isolation processing unit circuit is connected with the low voltage amplification circuit; the voltage dividing circuit draws electricity from a high voltage contact network and directly divides high voltage into low voltage AC signals, and the voltage, after photoelectric isolation and signal reduction processing by the high voltage side photoelectric isolation processing unit circuit, is also converted into the low voltage AC signals for use of a rear-stage low voltage amplification circuit; and the low voltage amplification circuit is used for shaping of photoelectric isolation signals and at the same time performing feedback on the forward output of a linear optical coupler to enable the conversion precision of the linear optical coupler to meet design requirements. The mutual inductor and the application method, provided by the invention, have the advantages of small size, light weight, loss power consumption, good stability, high safety performance and the like.

The invention discloses on-site calibration equipment of an integrated electric power voltage transformer. The equipment comprises: a standard voltage transformer, an intermediate connection cylinder, a high voltage bushing, a booster test transformer, a first flange, a left flange, an upper flange, a right flange and a second flange. The first flange is arranged on the standard voltage transformer. The left flange is arranged on an interface of a left side of the intermediate connection cylinder. The right flange is arranged on the interface of a right side of the intermediate connection cylinder. The second flange is arranged on the booster test transformer. The upper flange is arranged on an upper part of the intermediate connection cylinder. The first flange is connected with the left flange. The second flange is connected with the right flange. The high voltage bushing is connected with the upper flange. In a scheme of the invention, the standard voltage transformer and the booster test transformer are combined as one body. Quantities of the high voltage bushings can be reduced, equipment wiring can be simplified and a integrated level of the equipment can be increased. Simultaneously, a vehicle requirement of on-site calibration mechanization and automation operation of the 330KV electric power voltage transformer can be satisfied.

The invention belongs to the technical field of nervous system disease electrical stimulation, relates to a biological tissue time domain interference electrical stimulation device and a using methodthereof. The time domain interference electrical stimulation device comprises an AC signal source, a signal filtering module, a voltage control conversion module, a linear power source and a power source filtering module; two pairs of stimulation electrodes are attached to a body surface of a tissue to be stimulated, and two sinusoidal alternating electric fields at the frequency f and the frequency f+Delta f are applied to the two pairs of electrodes respectively, and when the two electric fields with similar frequencies meet, an interference phenomenon in the time domain can occur, and an envelope electric field is formed; and the frequency of the envelope electric field is the frequency difference between the two sinusoidal alternating electric fields. The electrical stimulation changepeak of the envelope electric field can be intensely focused in a specific region of the tissue in a spatial dimension through the time domain interference technique, so the purpose of non-invasive and precise regulation of electrical stimulation of a tissue targeted region only by adjusting the positions of the surface mount electrodes and the stimulation current ratio of the two pairs of electrodes.

Disclosed is a variable attack angel apparatus for a wind tunnel test of an aircraft engine model. A hydraulic motor is fixed to the right side of a frame, the rotation shaft of the hydraulic motor is connected with a first gear, the first gear is engaged with a second gear, the second gear and a third gear are fixed on a transmission shaft, the transmission shaft is fixed on the frame through a first bearing and a second bearing, the front side and the back side of the frame are connected with a mobile side plate respectively through a left arc guide pair and a right arc guide pair, the mobile side plate is fixedly connected with a workbench, a sector gear is fixed on the upper end surface of the right end of the mobile side plate, the third gear is engaged with the sector gear, the frame is provided with a self-lock mechanism, running mechanisms are installed at four corners of the frame, and the circle center of the left arc guide pair, the circle center of the right arc guide pair and the circle center of the sector gear are concentric and are disposed on a middle transverse line at the port surface of an inlet channel of the engine model. The variable attach angle apparatus can enable the attack angel of the engine model to be dynamically changed, and enables the result of the wind tunnel test of the aircraft engine model to be more accurate and reliable.

The invention discloses a fully-protected flexible unfolding re-entry aeroshell comprising a load capsule main body. A rigid thermal protection blunt nose is connected to the lower end of the load capsule main body. A sliding connecting frame is installed at the upper end of the load capsule main body. A head cover is arranged at the top of the sliding connecting frame. Hinged seats and threaded hole bearings are arranged at the connection between the load capsule main body and the rigid thermal protection blunt nose. The hinged seats are connected with the lower parts of lower support bars. The upper parts of the lower support bars are connected with the lower parts of upper support bars. The upper parts of the upper support bars is connected with the sliding connecting frame. A leeward side flexible thermal protection structure and a windward side flexible thermal protection structure are respectively connected to the upper support bars and the lower support bars. The fully-protected flexible unfolding reentry aeroshell uses a connecting-bar unfolding mechanism and adds the leeward side flexible thermal protection structure, thereby not only reducing the requirement of the fairing envelope of a launch vehicle and avoiding the impact of the inflow / shock wave on the rear-end of the aeroshell, but also improving the flight environment and increasing the loading volume to provide a technological path for the entrance, deceleration and landing of future load extraterrestrial asters.

The invention provides a power converter for an inverter air conditioner. The power converter comprises a rectification circuit, an AC current collection circuit, an AC voltage collection circuit, a DC voltage collection circuit and a digital signal processor; the rectification circuit is controlled to carry out rectification on a three-phase AC power supply; the AC current collection circuit collects an input current signal of the three-phase AC power supply; the AC voltage collection circuit collects an input voltage signal of the three-phase AC power supply; the DC voltage collection circuit collects an output voltage signal after rectification by the rectification circuit; and the digital signal processor calculates an input current value and an input voltage value of the three-phase AC power supply and an output voltage value of the rectification circuit, carries out real-time feedback calculation to provide a control signal for the rectification circuit according to a feedback calculation result, so that the output voltage of the rectification circuit is stabled in a reference voltage value and the input current phase of the three-phase AC power supply follows the input voltage phase of the three-phase AC power supply. According to schemes of the invention, the power factor is high, the content of harmonic waves is low, and the complex degree and sampling errors of circuits are reduced.

The invention belongs to the related technical field of robots, and discloses a low-inertia and high-load-bearing leg structure and a foot type robot applying the same. The leg structure comprises a crotch connector, a pelvis assembly, a knee joint motor, a hip joint motor, a side-sway joint motor and leg connecting rods, the crotch connector is connected with stators of the three motors at the same time, rotors of the three motors are connected with the pelvis assembly, the side-sway joint motor is coaxially opposite to the hip joint motor, the axis of the knee joint motor is perpendicular to the axes of the two motors, the hip joint motor drives the thigh connecting rod to rotate, the knee joint motor drives the shank connecting rod to rotate, and the side swing joint motor drives the leg connecting rod to swing laterally, so that outward swing and inward retraction of the legs of the robot and flexion and extension of the thighs and the shanks are achieved. According to the robot, the three joint motors are connected to the robot body and the pelvis assembly in parallel for power distribution, so that the inertia of the legs is reduced, the rigidity of the legs is enhanced, and the bearing and dynamic response capabilities are improved.

The invention discloses a control device of a DC bias type hybrid excitation motor, a control method and a system thereof, comprising: a speed sensor, a current sensor, a second rotating coordinate conversion module, a speed regulator, a MTPA module, a current regulator, a first rotating coordinate conversion module, a pulse width regulation module and a dual three-phase converter. The MTPA moduleis used for calculating the d, q, 0 axis current setting values according to the armature current setting values. The current regulator is used for converting each current set value into a corresponding voltage set value; the current regulator is used for converting each current set value into a corresponding voltage set value. The first rotational coordinate conversion module is configured to convert the d, q axis voltage set values into alpha, beta axis voltage set values. The pulse width regulating module is used for generating PWM signals according to the given values of the alpha, beta and zero axes to drive the dual three-phase converters, and controlling each phase winding of the six-phase direct current bias hybrid excitation motor by the current of each bridge arm of the dual three-phase converters. The invention can solve the problems of insufficient carrying capacity of the existing hybrid excitation motor and complex calculation of MPTA control parameters.

The invention discloses a pulse width frequency regulation mode DC / DC booster circuit, which has the combined advantages of PFM and PWM and is provided with an error voltage feedback circuit. When the load is lighter, the system operates in a split state represented by the PFM mode with high efficiency. When the load is heavy, the system operates in a continuous state represented by the PWM mode, and as the error voltage feedback circuit is added, the load carrying capacity of the system is improved obviously. Meanwhile, compared with a PFM / PWM control mode (the starting duration of NMOS is determined only an input voltage, while the starting duration of the PMOS is determined only by the different of an output voltage and the input voltage), the design avoids the problem that when the input is higher than the output, the PFM / PWM mode fails to turn off the PMOS.

The invention discloses a frequency injection based DC microgrid power sharing control method and system, which are applied to the technical field of microgrid control, and aim to solve the problem that the power cannot be shared due to the line impedance, and droop control cannot achieve power sharing on the premise of the stable output voltage; and the frequency injection based DC microgrid power sharing control method can achieve power sharing of a plurality of convertors in a DC microgrid. The frequency can allow the voltage droop problem existing in the classical droop control to transferto the frequency, so that in the DC microgrid, the stability of the output voltage is ensured, and the power sharing effect is ensured.

The invention provides a pressure-adjustable and capacity-adjustable hydraulic energy recycling and storing system. The hydraulic energy recycling and storing system comprises an oil cylinder (1), a variable hydraulic pump (2), a hydraulic switch network, a hydraulic cylinder (6), a hydraulic accumulator (7), a pneumatic accumulator (9), a three-position three-way valve (20) and a two-position three-way valve (21), wherein the variable hydraulic pump (2) communicates with the oil cylinder (1); the output end of the variable hydraulic pump (2) is connected to the hydraulic switch network; the hydraulic switch network communicates with the hydraulic accumulator (7); the hydraulic accumulator (7) is an air inflation type hydraulic tank, and is provided with a hydraulic cavity at the lower part and a compressed air cavity at the upper part; the compressed air cavity of the hydraulic accumulator (7) communicates with the pneumatic accumulator (9) through the three-position three-way valve (20); and the hydraulic cylinder (6) communicates with the hydraulic switch network. An energy recycling unit which is composed of the hydraulic accumulator (7) and the pneumatic accumulator (9) can realize recycling pressure and energy capacity double-parameter adjustment, so that an energy recovery and utilization rate is increased to the greatest extent, and consumption and emission of fuel oil can be greatly reduced while stable operation of system is ensured. The invention further provides a working method of the pressure-adjustable and capacity-adjustable hydraulic energy recycling and storing system.

The invention relates to a composite damping shock absorber for textile machinery. The shock absorber has good heat-dissipating performance, can bear large loads, fully utilizes damping effects of rubber and metal, and has the advantages of simple structure, small size and convenience in production. The technical scheme includes that the composite damping shock absorber for the textile machinery is characterized in that the shock absorber comprises a shock absorbing rod used for bearing supporting force, a shock absorbing component absorbing shock and a base; a fixing cavity with two sides communicated in the horizontal direction is formed in the base, and the shock absorbing component is positioned in the fixing cavity; the shock absorbing rod vertically penetrates an upper top plate through hole of the base downwards to be connected and fixed with the shock absorbing component.

The invention relates to an integrated coaxial medium voltage controlled oscillator and a manufacturing method thereof. The oscillator comprises a coaxial dielectric resonator, a tuning circuit, an oscillating circuit, an attenuation circuit and an amplifying circuit; the coaxial dielectric resonator is welded on a tube seat through welding technology, and other circuits are made on a ceramic substrate which is mounted on a tube casing; the circuits and the elements adopt gold wire bonding; and finally the coaxial dielectric resonator and the circuits are integrated in a fully sealed metal tube casing. In the invention, the attenuation circuit and a buffer amplifying circuit are added behind a voltage controlled resonator circuit, so that the isolation of the oscillator and a load is increased and the loaded capacity of the oscillator is improved; the ceramic circuit substrate and a bare tube core element are adopted and the resistor and inductor elements are made by adopting a film technique, so that the circuit volume is reduced and the integration of the circuits is improved; and the fully sealed metal tube casing is adopted for packaging, so that the environmental suitability is high.

The invention discloses an intelligent valve locator which is characterized by comprising a control unit, a valve location acquisition unit, an actuating unit, a controlled system, and a front-end input unit; to be specific, the control unit receives a deviation value between a set signal and a feedback signal to realize high-precision conversion, calculation and PWM output; the valve location acquisition unit monitors location of a valve spool of a controlled valve in real time; the actuating unit is composed of two piezoelectric valve type I / P electric appliance conversion units, the piezoelectric valves realize air feeding and discharging of an air chamber of the actuating unit as an ARM controller outputs PWM control signals to control switching; the controlled system is composed of a pneumatic diaphragm actuator and a linear-motion plunger valve, and the air chamber of the pneumatic diaphragm actuator is connected with two piezoelectric valves; the front-end input unit provides power supply and the set signal. According to the intelligent valve locator, the locator and the valve can be installed separately, non-contact field detection is achieved, and high-load problem of an input circuit is solved.

The invention relates to a novel electronic tag assisted order-picking system, in particular to an electronic tag order-picking assistant system based on two-wire system communication buses. The electronic tag assisted order-picking system comprises an upper computer, a plurality of controllers and a plurality of application terminals. The electronic tag assisted order-picking system is characterized in that the upper computer is used for accomplishing generation of orders and controlling the electronic tag assisted order-picking system, a TCP / IP network communication protocol is adopted between the controllers and the upper computer, three-channel output is adopted by each controller, the two-wire system communication buses serve as buses of channels, the application terminals are electronic tags, communication junction is achieved between the electronic tags and the channels of the controllers through the two-wire system communication buses, and the electronic tags analyze signals on the two-wire system communication buses, and achieve the function of fault diagnosis, the function of LED indication, the function of digital display and the function of scanning of the states of keys according to the analyzed signals. The whole electronic tag assisted order-picking system is controlled through the upper computer, and thus the picking operation becomes quite simple, labor intensity is reduced, working efficiency is improved, the accurate rate of picking is improved, and paperless operation of picking of a warehouse is achieved.

The invention discloses a phase frequency identifier, its first and second preset modules comprise a PMOS tube and an NMOS tube each, sources of the two PMOS tubes are connected with high logic level, sources of the two NMOS tubes are connected with low level, grids of the two PMOS or NMOS tubes are connected with reset signal, drains of the two MOS tubes connected with reset signal are connected with grids of the other two MOS tubes, drains of the two MOS tubes unconnected with reset signal are connected with first and second output nodes, respectively. And it can preset output nodes without delay of multiple transmission gates. And it completes preset bit while reset and raises working rate.

The invention discloses a high-precision correcting circuit for a band-gap reference voltage source. The circuit includes an operational amplifier, a capacitor, a PMOS tube and a trimming circuit. The opposite phase end of the operational amplifier is connected with reference voltage VBG generated by the band-gap reference voltage source, the in-phase end of the operational amplifier is connected with a first terminal Vf of the trimming circuit, and the output end of the operational amplifier is connected with a first terminal of the capacitor and a grid electrode of the PMOS tube; a source electrode of the PMOS tube is connected with an electric source VDD, a drain electrode of the PMOS tube is connected with a second terminal of the capacitor and a second terminal Vtop of the trimming circuit, a third terminal V1.2 of the trimming circuit is output voltage after correcting, and a fourth terminal Vbottom of the trimming circuit is connected with the ground. According to the high-precision correcting circuit for the band-gap reference voltage source, a snubber circuit in the band-gap reference voltage source is integrated with the correcting circuit, errors caused by influences of process corners, imbalance, temperature and other factors in the reference voltage can be corrected, the influences caused by fine adjustment on the temperature features of the reference voltage can be eliminated and the load carrying capacity of the output voltage is improved. By adopting a digital trimming mode, the high-precision correcting circuit has the advantages of being flexible in correcting, high in precision, low in power consumption and small in area.

The invention discloses a correctable low-power consumption voltage reference source with a power-on reset function. The correctable low-power consumption voltage reference source comprises a power-on reset circuit, a starting circuit, a reference voltage source core circuit, a reference voltage correcting circuit and a buffer circuit. The correctable low-power consumption voltage reference source disclosed by the invention has the power-on reset function, and can detect whether the supply voltage is effective supply voltage or not; the starting circuit has the characteristic of high starting speed; the reference voltage correcting circuit adopts a digital technology to correct MOS tubes and has the characteristics of high convenience in correction, small area and low power consumption; the correctable low-power consumption voltage reference source has the advantages of high precision, low power consumption, small area and wide working voltage range.

The power supply includes a feedback circuit composed of amplifier and regulation tube. One input end of amplifier receives a reference voltage, and another input end receives feedback voltage outputted from the regulation tube. One output end of the amplifier outputs a regulation voltage to the regulation tube, and a load is connected to the output end of the regulation tube. The regulation tube is composed of first field effect tube (FET) and second FET connected to each other in parallel that is to say that grid, source and drain poles of the first FET are connected to grid, source and drain poles of the second FET respectively. Two parallel-connected FETs as regulation tube are adopted in DC linear stabilized voltage power supply for main board so as to raise capability of carrying load greatly.

The invention relates to a high-precision NTP (Network Time Protocol) timing system and a timing method thereof and belongs to the technical field of a time synchronous system and a primary-secondary clock system. The timing system comprises a CPU (Central Processing Unit) for sending an NTP packet, wherein the CPU is communicated with a PLD (Programmable Logic Device); the PLD is used for receiving and sending the NTP packet and compensating and correcting each timestamp in the NTP packet; the PLD is communicated with an Ethernet PHY (Physical Layer) circuit and a timing output interface unit; an input end of the PLD is connected with an input port of a standard time source for conveying standard time; and the CPU is communicated with a user management interface. The high-precision NTP timing system has the advantages of high precision, accurate obtained data and convenience in networking, and the high-precision NTP timing system is free from occupying a special network.