75results about How to "Reduce startup frequency" patented technology

The invention discloses a soft start method of an LLC resonant converter. The LLC resonant converter comprises a bridge-type switching circuit, a resonance circuit, a transformer, a rectifying circuit and a filtering circuit which are all connected in sequence, wherein the resonance circuit is composed of a resonant inductor and a resonant capacitor connected in series. According to the method, the initialized duty ratio of a driving signal is D0, and the initialized driving frequency is f0, wherein the value of the D0 ranges from 0 to 15 percent, the value of the f0 ranges from 1.5fr to 2.5fr, and the fr is the resonant frequency. The duty ratio of the driving signal and the driving frequency respectively increase and decrease linearly along with time or respectively increase and decrease exponentially along with time, so that while the duty ratio of the driving signal increases to 50 percent, the driving frequency decreases to the resonance frequency fr, and soft start of the LLC resonant converter is achieved. Through the method, impact current occurring in the start process of the resonant circuit can be restrained, the start time is short, a driving circuit is easy to obtain, and cost is low.

The invention discloses a control method for a compressor. The control method comprises the steps that after the compressor achieves shutdown protection, the shutdown protection time of the compressor in the running process of an air conditioner is updated; when the shutdown protection time of the compressor is larger than a first preset time, the starting frequency of the compressor is decreased, so that the compressor is started to run according to the decreased starting frequency when the compressor is restarted. The invention further discloses a control device for the compressor. According to the control method and device for the compressor, by decreasing the starting frequency of the compressor, the compressor slowly reaches high and low temperature protection values, and then the compressor restarting time is decreased.

The invention relates to an energy saver for base station machine room air conditioners. The invention solves the problems of high power consumption and short service life in the existing air conditioner. The energy saver comprises a shell and an automatic control loop assembled in the shell. The invention has the technical points that a temperature acquisition control unit is arranged in the automatic control loop, and a room temperature sensor and a return air inlet temperature sensor and an air outlet temperature sensor transmit the acquired temperature analog values in three ways: the temperature analog value in the first way is converted into a digital signal through an analog-to-digital conversion chip; the temperature analog value in the second way is converted into a voltage signal through a current/voltage conversion chip of an operating mode control unit; and the temperature analog value in the third way is converted into a voltage value through a current sensor in a fault detection and recovery unit, and a pulse driver in a temperature compensation unit emits a pulse signal to drive the semiconductor refrigerator to work, thereby carrying out real-time dynamic compensation control. Due to the reasonable structural design, the invention can automatically adapt to the change of the operating state of the air conditioner, quickly display the fault, realize automatic fault recovery, obviously prolong the service life of the air conditioner and enhance the energy saving effect.

The invention provides a refrigerating system and a refrigerator with the refrigerating system. The refrigerating system comprises a first refrigerating sub-system and a second refrigerating sub-system which independently run, wherein the first refrigerating sub-system comprises a first compressor, a first condenser, a first capillary tube and a first evaporator, and the second refrigerating sub-system comprises a second compressor, a second condenser, a second capillary tube and a second evaporator. The first refrigerating sub-system and the second refrigerating sub-system which independently run are arranged in the refrigerating system provided by the embodiment of the invention, and the corresponding refrigerating sub-system can be thoroughly closed after the temperature reaches the refrigerating temperature, so that the independent control of the refrigerating system is practically realized and the energy-saving purpose is achieved. Besides, the starting frequency of the first compressor and the second compressor is reduced by the first refrigerating sub-system and the second refrigerating sub-system which independently run, so that the service life of the refrigerator is prolonged.

The invention relates to the technical field of air conditioners and discloses an auxiliary frequency converting control method and system of an air conditioner and the variable frequency air conditioner. The auxiliary frequency converting control method of the air conditioner comprises the steps that the first indoor temperature and the second indoor temperature before and after a first preset time period of the air conditioner are acquired, and the second indoor temperature is compared with an expected temperature; when the difference value between the second indoor temperature and the expected temperature is not larger than an auxiliary control triggering threshold value, the indoor temperature difference value corresponding to the first preset time period is determined according to the first indoor temperature and the second indoor temperature, wherein the auxiliary control triggering threshold value is smaller than a main control triggering threshold value triggering the main frequency converting control system to execute main frequency converting control actions; the auxiliary frequency converting amount is determined according to the indoor temperature difference; and according to the auxiliary frequency converting amount, a compressor is triggered to execute frequency converting actions. The correction of the frequency of the compressor is achieved according to the temperature rising and decreasing of the indoor temperature, and the temperature fluctuation caused after the indoor temperature reaches a user set temperature is prevented.

An embodiment of the invention discloses a wireless communication system synchronization method. The method comprises steps of: a mobile terminal receiving synchronization information from a base station, the synchronization information comprising time information of the base station; extracting the time information of the base station in the synchronization information; and adjusting time of themobile terminal based on the time information of the base station. The invention simultaneously discloses a wireless communication mobile terminal, a base station and a wireless communication system.Embodiments of the invention may reduce dependence of the mobile terminal on time synchronization to a GPS satellite reception system, which may prolong start period of the GPS satellite reception system, reduce start frequency, to solve problem of excessive power consumption caused by starting the GPS satellite reception system with high frequency.

The invention provides a cooking device, comprising: a device body with cooking chamber arranged therein; a steam valve, through which the cooking chamber can communicate with the environment outsidethe cooking chamber, a water supply device, of which the outlet is communicated with the steam valve and which is used for supplying water to the steam valve. According to the cooking device, the water supply device can be used for supplying water to the steam valve. In this way, water can be fed into that steam valve by controlling the water supply device to clean the steam valve, so that steam valve is can be cleaned without disassembly, so that the cleaning work of the steam valve is more convenient, and can prevent the user from neglecting to clean the steam valve due to the inconvenienceof cleaning the steam valve. In addition, by supplying water to the steam valve, foam in the steam valve can be burst and released to reduce the amount of foam and restrain the rise of the foam, strengthen the defoaming effect in the steam valve, prevent the foam from overflowing from the steam valve to pollute the kitchen environment and enhance the use experience of the product.

The invention provides a refrigeration storage device, a control method and device thereof and a storage medium. The method comprises the steps that after the refrigeration storage device is powered on and runs, the temperature of the environment where the refrigeration storage device is located and/or the door opening conditions of the refrigeration storage device are detected, wherein the door opening conditions include single-time door opening time, cumulative door opening time and/or the number of times of door opening; whether the temperature of the environment and/or the door opening conditions meet preset conditions or not is judged; if not, the refrigeration storage device runs in a first control mode. By means of the scheme, energy-saving control over the refrigeration storage device can be achieved.

The invention discloses a pneumatic shield gate system for wind and solar complementary power generation, which includes a gate unit, a pneumatic power unit, and a power generation and power supply unit; It consists of a pneumatic control valve group for opening and closing a pneumatic shield gate, and a PLC controller that controls the action of the pneumatic control valve group; the pneumatic power unit is composed of at least two parallel air storage tanks and at least two parallel air compressors. , the air outlet of the air compressor is connected to the air inlet of the air storage tank and the pneumatic control valve group through the air outlet check valve through the combination of the front filter, the air dryer and the rear filter; the power generation unit includes wind power generation machines, solar panels, wind and solar hybrid controllers, and inverters. The advantage of the invention is that it is designed for the construction of barrage and sluice projects in remote and remote mountainous areas without power supply, and uses the characteristics of strong complementarity between wind energy and solar energy in terms of time and area to improve the stability of system operation.

An intelligent refrigerated container power supply switching device comprises an intelligent refrigerated container power supply management device generating a control instruction. The intelligent refrigerated container power supply management device is connected with a data communication module. The data communication module is connected with a switching logic generating module. The output ends of an alternating-current measurement module and a direct-current measurement module are connected with the input end of the switching logic generating module. The output end of the switching logic generating module is connected with the input end of a switching execution module. The output end of the switching execution module is connected with the input ends of an AC/DC power supply conversion module, an inverter module, a storage battery direct-current power supply line, and an alternating-current power supply line. The AC/DC power supply conversion module, the inverter module, the storage battery direct-current power supply line and the alternating-current power supply line supply power to a refrigerated container refrigeration unit. A control method of the intelligent refrigerated container power supply switching device has the advantage of meeting the needs of different specifications, different power and different power utilization types of refrigerated container groupage traffic, and can be applied and popularized to the field of refrigerated container power supply.

The invention relates to a heat-pump water heater reheating control method. A heat-pump water heater comprises a detector for detecting water tank water temperature and environment temperature. The control method comprises the following steps that (1) temperature parameters of the heat-pump water heater are obtained; (2) according to the temperature parameters of the heat-pump water heater, set temperature return difference T and actual temperature return difference t are obtained through calculation and are compared with each other; and (3) whether the heat-pump water heater is controlled toheat or not is done according to comparative results. By means of the heating control method, the heat-pump water heater can be adjusted only by detecting the environment temperature and the actual water temperature, logics is simple, program achievement is facilitated, meanwhile, a compressor of the heat-pump water heater is protected, and frequent starting and stopping are prevented.

The invention discloses a tire extruder temperature control device which comprises a cooling device, a heating device and a temperature control device, wherein the temperature control device comprises a proportion integration differentiation (PID) controller and a temperature lower limit alarming terminal, the heating device is connected with the temperature lower limit alarming terminal, and the cooling device is connected with the PID controller. The tire extruder temperature control device is characterized in that a temperature value set by the existing unique PID controller is changed to be a range value by aid of the temperature lower limit alarming terminal. The temperature lower limit alarming terminal in the temperature control device is actually the temperature lower limit alarming terminal which is arranged in an alarming device of the existing tire extruder device, and the heating device is merely needed to be connected with the temperature lower limit alarming terminal in the alarming device.

The invention discloses a water pump controller convenient to adjust. The water pump controller convenient to adjust comprises a shell provided with a water inlet connector and a water outlet connector and a control circuit board. The shell comprises a pressure cavity and a pressure maintaining device connected with the pressure cavity. The water inlet connector and the water outlet connector communicate with the pressure cavity. The shell is further internally provided with a pressure sensor and a flow sensor which are electrically connected with the control circuit board. When the flow signal value output by the flow sensor is less than or equal to a set shutdown flow value, the control circuit board outputs a shutdown signal to a water pump, and the pressure maintaining device maintainsthe water pressure of the pressure cavity in a water pump shutdown state. When flow is formed at the water outlet connector, the pressure maintaining device enables the water pressure of the pressurecavity to decline gradually. When the pressure signal value output by the pressure sensor is less than or equal to a set startup pressure value, the control circuit board outputs a startup signal tothe water pump. The water pump controller convenient to adjust can effectively reduce the starting frequency of the water pump, remain the pressure of a water supply pipe stable and meanwhile ensuresthat the water supply amount of the water pump is matched with the requirement of a demand side.

The invention relates to a shooting device. An automatic tracking shooting device comprises a camera and a camera holder, wherein the camera is installed in front of a black board and is arranged on the camera holder. The automatic tracking shooting device further comprises a master control processing chip and two infrared signal emitter groups, each infrared signal emitter group comprises a plurality of infrared signal emitters, the master control processing chip is installed inside the camera holder, the first infrared signal emitter group is transversely fixed below the black board along the black board, the second infrared signal emitter group is fixed on a ceiling in front of and above the black board, and the infrared signal emitters in the second infrared signal emitter group correspond to the infrared signal emitters in the first infrared signal emitter group one to one in position. The automatic tracking shooting device changes installation positions of the infrared signal emitters, lowers the starting frequency of the camera holder, and therefore enables shot images to be smooth.

The invention provides a hydraulic system capable of lowering hydraulic oil source startup frequency of an AMT (Automated Mechanical Transmission). The system comprises a one-way valve (1), a hydraulic control one-way valve (2) and a pressure sensor (3), wherein the one-way valve (1) comprises inlets, which are respectively connected with an oil filter (4) and a control end of the hydraulic control one-way valve (2), and outlets which are respectively connected with a gear shift control valve and an oil inlet of the hydraulic control one-way valve (2); an oil outlet of the hydraulic control one-way valve (2) is connected with a power accumulator (5) and the pressure sensor (3) respectively. According to the hydraulic system, the hydraulic oil source startup frequency of the AMT caused by hydraulic pressure leakage can be effectively lowered when an AMT system has no gear shifting action, and thus, the service lives of a hydraulic oil source and a control relay are prolonged.

The invention relates to a target detection method and device, a storage medium and a device. The method comprises the steps of obtaining a video stream; performing target detection on the first frameimage and the secondary frame image in sequence to obtain a first detection result and a second detection result, wherein the first frame of image is a first frame of image which meets a target detection condition and is not subjected to target detection in the video stream, and the secondary frame of image is a first frame of image which meets the target detection condition after the first frameof image; determining a video interval according to the first frame image and the secondary frame image, and performing target tracking on the images in the video interval in sequence based on the first detection result to obtain a target tracking result; and fusing the second detection result and the target tracking result to obtain a target detection result. According to the invention, high-precision target detection can be carried out on the video stream in real time.

The invention discloses an automatic cleaning device for an air compressor heat sink. Fixing frames are fixedly mounted on an air compressor case body; a first guide rail and a second guide rail are mounted on the fixing frames parallelly and fixedly; a first sliding block and a second sliding block are mounted on the first guide rail and the second guide rail correspondingly; a motor is fixedly mounted on the first sliding block; a rack is mounted at one side of the compressor case body; an output shaft of the motor is sleeved with a gear; the gear is engaged with the rack; and one end of a rotatable hairbrush is inserted in the second sliding block, and the other end of the hairbrush is connected with the output shaft of the motor. According to the automatic cleaning device for the air compressor heat sink, the heat emission efficiency of the heat sink can be increased; the start frequency of a cooling fan can be reduced, electricity consumption is lowered, and the energy is saved; the maintenance cost is lowered; and the service life of the heat sink is prolonged.

The invention relates to the technical field of sewage collection and discharge, and discloses a self-driven quasi-single-phase flow vacuum drainage system. The self-driven quasi-single-phase flow vacuum drainage system comprises a grading mechanism, wherein the grading mechanism further comprises a water storage tank, a connecting pipe I is fixedly connected to the interior of the water storage tank, a threaded pipe is connected to the outer side of the connecting pipe I in a sleeving mode, and a flow driving plate is rotationally connected to the bottom end of the threaded pipe. According to the self-driven quasi-single-phase flow vacuum drainage system, sewage enters a water collecting tank through a sewage pipe, and the sewage is communicated with a vacuum pipeline through a self-driven system so that the vacuum system cannot be damaged. According to the system, dirt attached to the inner wall of the flow driving plate can be self-cleaned, so that the inner wall is prevented from being blocked, and the sewage discharge efficiency is improved; and meanwhile, air is prevented from being sucked into the system as much as possible, so that the water conveying efficiency of the quasi-single-phase flow system is improved, and the energy consumption and the later operation and maintenance cost of the drainage system are greatly reduced.

The invention provides a cooking equipment, comprising an equipment body; an inner pot is set in the equipment body; a spray device sprays water into the inner pot through the mouth of the inner pot when the spray device is working; a foam detector used to detect the foam in the inner pot rising to the preset position releases the anti-overflow signal; a controller connected to a timer, the spraydevice and the foam detector is used to start the spray device when the anti-overflow signal is received, and continues to detect the anti-overflow signal after the spray device is started, and startsthe timer with the anti-overflow signal undetected; the timer is used to detect the delay time of the foam detector and triggers the controller to control the spray device to shut down when the delaytime reaches preset time. The cooking equipment provided in this scheme sets the spray device to delay spraying water into the inner pot for effectively breaking the bubbles and avoiding the foam backwash, and realizes the anti-overflow function of the cooking equipment, and reduces the water loss in the inner pot to ensure the cooking taste.

The invention discloses a method for prolonging life of an intelligent control sensor of a motor. A water pump, a pressure sensor, a single-chip microcomputer, a drive element and a pump motor are provided. The pressure sensor is used for measuring interior real-time water pressure of the water pump. The single-chip microcomputer is used for continuously transmitting a detection signal to the pressure sensor. The pressure sensor returns a feedback signal to the single-chip microcomputer. After determination and calculation, a pump head motor control signal suitable for a current motor type is output; or the single-chip microcomputer directly outputs a set program signal; on and off of the drive element of high power is controlled, and filtering and anti-interference of chaotic control electrical signals is achieved; the single-chip microcomputer outputs a control signal of proper duty ratio according to the acquired feedback signal and the motor type; accordingly, operating frequency of the pressure sensor and that of the pump motor are decreased, the service life of the pressure sensor and that of the pump motor are prolonged, and the problem that excessively high start frequency of the pressure sensor and that of the pump motor, both running at a critical point, cause shortened life of the pressure sensor and shortened life of the pump motor is solved.