40results about How to "Realize the soft start function" patented technology

The invention discloses a PWM controller applied to a switching type voltage stabilizer, which comprises an error amplifier, a soft-start control circuit, a compensation load and a comparator, wherein, the error amplifier receives a voltage reference and a feedback voltage and outputs an error current signal hereby; the soft-start control circuit outputs a compensating current signal according toat least a soft-start control signal; the compensation load receives the error current signal and the compensating current signal and outputs a compensating signal; the comparator receives a ramp signal and the compensating signal and outputs a PWM signal; the error amplifier compensates according to the presetting soft-start compensating current when the power supply voltage is increased, and slowly charges a circuit common-ground VSS so as to lead the error signal to promote slowly until the soft-start control cycle comes to an end, thereby serving the soft-start function when the power supply voltage is increased.

The invention provides a soft-start circuit and a DC-DC circuit which includes the soft-start circuit. In the DC-DC circuit, output of a pulse-width modulation comparator is controlled through an error amplifier so that a stable output voltage can be output at last. At the same time, in the soft-start circuit, a reference-source voltage output by the soft start is controlled through a switch capacitance-resistance circuit so that the reference-source voltage rises slowly and becomes stable as a reference voltage at last and a DC-DC output voltage is enabled to rise slowly with the reference-source voltage output by the soft start so that generation of an overshoot voltage in a start process is prevented and a soft-start function is realized and thus the circuit is protected better.

The present invention relates to a special-purpose cleaning machine for microporous ceramic filtering plate of ceramic filter. It includes shell body, cleaning channel set on said shell body, ultrasonic transducers and washing device. In the cleaning channel interior a ceramic filtering plate positioning frame is set, its bottom portion is equipped with fluid-discharging tube, the ultrasonic transducers are respectively mounted at two sides of said cleaning channel. The washing device is formed from internal circulating pipeline and circulating pump mounted on the internal circulating pipeline. Said invention utilizes ultrasonic wave and chemical cleaning agent to clean filtering plate, so that it can prolong the service life of ceramic filtering plate.

The invention relates to a self-anti-interference starting method for a permanent magnetic synchronous motor, and belongs to the technical field of motor driving. The method comprises the steps as follows: detecting and judging the bus current and counter-electromotive force of a permanent magnetic synchronous motor inverter in real time to enable the permanent magnetic synchronous motor inverter to execute waiting, compulsive stop instruction or to be switched into a pre-start mode; setting periodic start time Tn and restart times w to enable the permanent magnetic synchronous motor to be started at a time after the periodic start time Tn, the start times of the permanent magnetic synchronous motor is less than or equal to the restart times w, and fault information is sent to the permanent magnetic synchronous motor if the start fails; and as regards an initial position detection module, exerting a series of voltage pulse with the same size and different directions to a stator winding and detecting the corresponding current of the stator winding to acquire an initial position. The starting method improves the start reliability of the permanent magnetic synchronous motor, reduces damages to the motor caused by frequent controller start, increases the angle control precision of a wireless sensor, and improves the performances of a motor control system.

The invention discloses a two-way boost-buck circuit for a storage battery energy-storage system and a digital control method thereof. The two-way boost-buck circuit consists of an energy storage inductor LP, a power tube Sbuck, a power tube Sboost, a snubber capacitor Cs, a resonant inductor Lr, a resonant capacitor Cr and a diode. A control device includes a control core, a drive circuit, a sampling circuit, an upper computer and an LCD display screen. The control core obtains the voltage, current, and output voltage of the storage battery set, the voltage of the snubber capacitor Cs, and the voltage of the power tube Sbuck by the sampling circuit; on the basis of a corresponding control algorithm, a drive wave form is outputted by the drive circuit so as to drive the power tube Sbuck and the power tube Sboost; the control core sends the voltage and the current of the storage set to the LCD display screen; the upper computer collects all variable values of the current working situation from the control core and the values are displayed by upper computer software; and the upper computer also can send a control command to the control core. According to the invention, the provided circuit and method can be applied to the storage battery energy storage system and two-way electric energy flowing can be realized well.

The invention relates to an inter-shaft permanent magnet coupling mechanism used for transmitting torque between two rotating shafts. The mechanism is characterized in that a permanent magnet rotor and a conductor rotor are of disk structures, and the end faces of the permanent magnet rotor and the conductor rotor are opposite and form an air gap; a plurality of main magnets on the permanent magnet rotor are distributed along the circumference, magnetizers made of permeability magnetic materials are put between adjacent main magnets, and auxiliary magnets are arranged on the sides, far from the conductor rotor, of the magnetizers; the magnetic pole directions of the main magnets are positioned on the circumferential direction of the permanent magnet rotor, and the magnetic pole directions of adjacent main magnets are opposite or reverse; the magnetic pole directions of the auxiliary magnets are vertical to the end face of the permanent magnet rotor, and the magnetic pole directions of adjacent auxiliary magnets are opposite; and the magnetic poles on the sides on which two adjacent main magnets and one auxiliary magnet are in contact with the same magnetizer have the same polarity. The mechanism can transmit larger torque, can adjust the transmitted torque, has compact structure and low requirement for installation precision, and is stable in transmission and adjustment.

The invention belongs to the technical field of solar energy utilization, and in particular relates to a portable photovoltaic direct drive refrigerator system with thermoelectric adaptive cooling components, including photovoltaic power generation components, thermoelectric adaptive cooling components and DC refrigerator components; photovoltaic power generation components include photovoltaic panels, A DC fuse and a maximum power tracking module; a thermoelectric adaptive cooling component includes interconnected thermoelectric power generation sheets and a DC fan; a DC refrigerator component includes a refrigerator box, a DC inverter compressor, a DC compressor controller, and a thermostat. By adding a thermoelectric self-adaptive cooling component, the present invention can self-adaptively adjust the speed of the internal fan to help the contents cool down quickly, which is conducive to the timely transfer of cooling capacity, and is more in line with the scene requirements for outdoor use. Moreover, the system adjusts the speed of the compressor according to the maximum power available from the photovoltaic panels. The energy utilization efficiency of the system is higher, and the cooling rate is faster, which meets the needs of rapid cooling for outdoor use of photovoltaic refrigerators.