65results about How to "No stability issues" patented technology

The air spring vibrating isolation base with the magnetic suspension unit includes the: the basal body, a group of air spring, the air feed system, the high controlling system, many magnetic suspension units, the low stiffness righting device. The input of the air feed system and the high controlling system are connected with each other. The output of the high controlling system is connected with every air spring; the magnetic suspension unit is connected to the air feed system. The magnetic suspension and the air spring are connected under the basal body in series to support it; the side of the basal body is installed with the low rigidity righting device. The invention can be proper for the super high air spring isolation base in the condition of not changing the bearing ability of the vibration separation system.

The invention discloses a fingerprint detection circuit and a fingerprint detection device. The fingerprint detection circuit comprises a signal generation circuit, an emitting electrode, an induction unit and a signal processing circuit, wherein the signal generation circuit is used for generating an alternating-current signal, the emitting electrode is used for transmitting the alternating-current signal to fingers, the induction unit is used for collecting fingerprint information of the fingers, the signal processing circuit is used for processing the fingerprint information, and the signal generation circuit is electrically connected with the emitting electrode and the induction unit respectively. In this way, the alternating-current signal with a certain amplitude is coupled to the fingers by the emitting electrode so that a voltage division signal can be formed by the alternating-current signal through a first capacitor formed between the fingers and the induction unit and a second capacitor formed between the induction unit and the ground, output data including fingerprint information are generated after the voltage division signal is processed through the signal processing circuit, and finally fingerprint detection can be completed. Because an open-loop structure is adopted in the whole circuit and any feedback circuit is not adopted, the circuit is low in cost, high in reliability and high in fingerprint detection speed.

The invention discloses an offshore wind turbine grid connection method. The method includes the steps that after an offshore wind turbine converts wind energy into alternating current, the alternating current is boosted to proper voltage through a boosting transformer and connected to an alternating current bus; the alternating current bus collects the alternating current boosted by the boosting transformer; an offshore convertor station converts the alternating current collected on the alternating current bus into direct current; a submarine cable transmits the direct current converted by the offshore convertor station in a long distance; a land convertor station converts the direct current transmitted through the submarine cable into alternating current; a main transformer converts the alternating current converted through the land convertor station into a proper voltage grade, and the alternating current is connected into a main power grid. The invention further discloses an offshore wind turbine grid connection system. The problems existing in grid connection of an offshore wind plant with the long distance and large capacity are solved.

The invention discloses an external clock synchronization circuit of a switching power supply. In the prior art, a circuit structure is complex, external synchronization time is long and frequency jitter exists. By using the external clock synchronization circuit of the switching power supply, the above disadvantages can be overcome. The circuit comprises: a frequency-halving circuit, a frequency cap detection circuit, a lower limit frequency detection circuit, an external synchronization stopping detection circuit and a frequency selection circuit. An external synchronous clock is connected to the lower limit frequency detection circuit and the frequency cap detection circuit through the frequency-halving circuit so as to detect whether the external synchronous clock frequency is in a preset numerical interval. The lower limit frequency detection circuit is connected with the synchronization stopping detection circuit so as to determine whether the external synchronous clock is removed. Control signals output by the lower limit frequency detection circuit and the frequency cap detection circuit are connected to the frequency selection circuit so that the frequency selection circuit is controlled to select one from an internal clock and the external synchronous clock to output so as to be taken as a working clock of the switching power supply. A circuit structure is simple. The external clock can be rapidly and accurately synchronized and the external clock synchronization circuit of the invention can be applied in various kinds of the switching power supplies.

The invention discloses a high withstand voltage IGBT DC power distribution based electric vehicle charging station. The high withstand voltage IGBT DC power distribution based electric vehicle charging station comprises a high-voltage circuit breaker, a high-voltage power frequency transformer, a high-voltage DC conversion device and a charger. A three-phase high-voltage input voltage is connected with the high-voltage power frequency transformer through the high-voltage circuit breaker; the output end of the high-voltage power frequency transformer is connected with the high-voltage DC conversion device; and the high-voltage DC conversion device converts a three-phase high-voltage input AC power into a DC power and then supplies to DC power to the charger. By adoption of the high withstand voltage IGBT, the high-voltage DC conversion device realizes power factor correction, LLC full bridge inversion and a DC power distribution scheme of converting the three-phase high-voltage input AC power into the DC power and then supplying the DC power to the charger; and without power factor correction, the design of the DC charging module is simplified, the power density of the DC charging module is improved, the reliability of the charger is improved and the cost of the charger is reduced. In addition, the high withstand voltage IGBT DC power distribution based electric vehicle charging station increases the device IP protection level, improves the working reliability of the device in an outdoor malicious environment and prolongs the service life of the device.

The invention relates to a boosting circuit. The boosting circuit comprises a bias voltage module, a main boosting module, a driving control module, a voltage feedback module, a current feedback module, a limiting loop and an oscillating circuit. By utilizing the boosting circuit, a novel boosting modulation structure is provided, and two output voltages are achieved on the basis; moreover, the switching pulse period and the switching pulse frequency are automatically adjusted along with the input output voltage and load conditions, the problem of low loop stability is avoided, and the efficiency is higher.

The invention provides a mechanical arm overturning and clamping mechanism of construction machinery, and belongs to the technical field of machining equipment. The problem that due to the lack of aneffective distance adjusting mechanism between two lifting mechanisms in the clamping mechanism, two rotary clamping mechanisms cannot be flexibly adjusted according to mechanical arms with differentlengths, and then the practicability of the clamping mechanism is reduced needs to be solved, so that the mechanical arm overturning and clamping mechanism comprises a rack, wherein two left square bracket-shaped sliding rails are arranged on the upper end face of the rack in a front-back symmetrical mode, and a distance adjusting mechanism is arranged on the upper portion of the rack. When the distance between the two lifting mechanisms is adjusted, a rotating shaft of an adjustment motor drives a distance adjusting screw rod to rotate, so that two moving plates drive the two lifting mechanisms, two angle adjusting mechanisms and the two rotary clamping mechanisms to move close to or away from each other under the action of two left-hand threads, then the two rotary clamping mechanisms can be flexibly adjusted according to the mechanical arms with different lengths, and the practicability of the clamping mechanism is improved.

A system for dynamically compensating phase margin of a low dropout linear regulator comprises a low dropout linear regulator, a detection circuit, a decision circuit, a load controllable circuit, a reference voltage input end and a voltage output end, wherein the low dropout linear regulator amplifies input reference voltage to a certain scale, and outputs the amplified voltage to the voltage output end; the detection circuit detects the voltage at the voltage output end as per a set standard, and outputs a detection result to the decision circuit; the decision circuit decides the detection result as per a certain regulation, and outputs a decision result to the load controllable circuit; the load controllable circuit performs corresponding load change to the decision result, so as to change the phase margin of the low dropout linear regulator. The system can dynamically detect the phase margin of the low dropout linear regulator, and performs real-time compensation, so as to avoid the stability problem in the low dropout linear regulator during dynamic response.

The invention relates to the field of solid waste resource utilization, discloses a method for stabilizing CaSO3 in desulfurized fly ash, and aims at solving the technical problem that the utilization of the CaSO3 in the desulfurized fly ash is relatively high in treatment cost and bad in application effect in the prior art. The method comprises the following steps: firstly obtaining a mixture of the sulfurized fly ash and stripping rock tailings particles, wherein the total mass of the desulfurized fly ash is 5-20% of the total mass of the stripping rock tailings particles; spraying a preset amount of water in the mixture of the sulfurized fly ash and the stripping rock tailings particles, wherein the water yield is 10-15% of the total mass of the mixture; and finally covering the mixture through a screen, and maintaining the mixture through spraying water which is 5-10% of the total mass of the mixture to the mixture every 5-7 days, wherein the maintenance time length is 6-13 weeks so that the CaSO3 in the desulfurized fly ash generates ettringite. According to the method disclosed in the invention, the technical effect of reducing the treatment cost while the desulfurized fly ash is effectively utilized is achieved.

The invention relates to a control system of a numerical control machine tool. The control system comprises an MCU controller, a stepping motor, a lead screw, a machine tool working table, a main shaft, a tool and bearings. An instruction pulse output by the MCU controller is connected with the stepping motor. A drive shaft of the stepping motor is connected with and provided with the lead screw. The two ends of the lead screw are connected with and provided with the bearings. The lead screw and the machine tool working table are matched and connected with each other. A main shaft box is arranged above the machine tool working table. A feeding instruction signal output by the MCU controller controls and drives the motor through a pulse distributor. In addition, a speed detector and a position detector are arranged, the position detector is connected with a position comparator through a signal line, and the speed detector is connected with the speed controller through a signal line. Transmission error in a whole mechanical transmission chain from the motor to the machine tool working table is eliminated through feedback, and therefore the accurate position of the machine tool working table is obtained; the control system is convenient to control, simple in structure and low in price.

The invention relates to a DC-DC converter based on a ring oscillator, and the theory of the ring oscillator is used for realizing the control of the DC-DC converter. The free oscillation of a feedback control loop of the DC-DC converter is utilized by the DC-DC converter for generating a signal for controlling on and off of a switch tube without adding a pulse signal; and the voltage is stably outputted through a comparator. The power consumption generated by a control circuit of the DC-DC converter is low, and the high conversion efficiency can be realized in a wide load range; the control circuit of the DC-DC converter is simple, has no stability problem, and does not need a compensating circuit; the chip area occupied by the DC-DC converter is smaller than the prior art to save cost; and the DC-DC converter has a faster response speed and a smaller ripple than the prior art.

The invention belongs to the technical field of photovoltaic supports, and particularly relates to a photovoltaic cable truss support which comprises a plurality of middle stand columns arranged in rows and end stand columns arranged at the two ends of each row; a cable truss mechanism is erected on each row of end upright posts and middle upright posts; the cable truss mechanism comprises an upper chord cable, a lower chord cable and an inclined rod, and the inclined rod is arranged between the upper chord cable and the lower chord cable; the upper chord cable and the lower chord cable are flexible inhaul cables; a plurality of purlines are laid on the upper chord cables of every two rows of cable truss mechanisms; and the end upright post is provided with a cable-stayed part connected to an external fixed part. The photovoltaic cable truss bracket has the advantages of material saving, strong bearing capacity and strong deformation resistance, thereby achieving the effect of improving the stability of a photovoltaic module.