48results about How to "Realize frequency conversion control" patented technology

The invention relates to the field of switch converters and aims to provide a control method of an asymmetrical half-bridge fly-back converter. According to the control method of the asymmetrical half-bridge fly-back converter, the efficiencies of both light loading and heavy loading can be considered, in the light loading, the duty ratio can be reduced, the primary side peak current is reduced, the circulation energy is reduced, the frequency converting control can also be achieved, and the no-load power consumption and the light-load loss are effectively reduced; in the heavy loading, the complementation can be achieved, a part of the energy is delivered through a blocking capacitor to the greatest extent, the energy stored by a transformer is reduced, in addition, two switches achieve zero voltage switching, and the efficiency of the converter is improved.

The invention relates to a control method of the hydraulic system of a fuel tanker, which controls a motor driving a positive displacement pump in the hydraulic system by controlling operating frequency and comprises the steps of a detection stage: detecting an input voltage signal; an operating stage: operating according to preset frequency corresponding to the voltage signal when the detection result shows that one input voltage signal exists, and operating according to the preset frequency corresponding to the input voltage signal with high priority level when the detection result shows that two input voltage signals exist. The method and the device realizing the method realize the rotating speed regulation of the positive displacement pump by changing the rotating speed of the motor driving the positive displacement pump through continuously changing the power frequency, thus leading the fuel tanker to operate in a best working condition, improving the energy utilization rate and reducing the energy loss.

The invention provides an intelligent control system and control method used for building engineering deep-well precipitation. The system comprises an intelligent precipitation system used for reducing the foundation pit bottom underground water level, an intelligent recharging system and an intelligent detecting system, the intelligent recharging system is used for stabilizing the underground water level of surrounding buildings in the foundation pit precipitation process, the three systems are built on a WEBS system integrated platform, information collected by various sensors of the tail ends of the systems serves as the reference, and various conditions of the site are monitored in real time, the three branch systems are connected with a central control cabinet and a central server atthe same time, a user sends out an instruction through an application program on the central server, the central control cabinet carries out comparison matching on feedback signals of the sensors at the tail ends of the systems according to the internal core logic program, and the running state of equipment can be changed in real time. The control system can monitor the underground water level change in real time, the running state of a precipitation device is actively controlled, and the base bottom underground water level and the foundation pit surrounding precipitation curve are stabilizedwithin short time.

The invention discloses an intelligent high-voltage power supply control system on a dock. The system is provided with a three-level structure, i.e. an embedded main processor, a co-processor and an interface module, to calculate pulse data, generate and send pulse, and monitor the state of each level of power module group, wherein the main processor calculates the duty cycle in a period according to the voltage phase and the direct-current voltage of the current switching period according to needs; the co-processor performs phase shift and synchronous processing on the data of the duty cycle according to the cascade level of a power module to generate a pulse sequence containing a time-sequence relation; the interface module is mainly used for performing dead-time compensation and narrow-pulse elimination on the pulse sequence sent by the superior co-processor, packing the pulse sequence according to a communication protocol and sending the pulse sequence to an optical fiber interface, and the pulse sequence is transmitted to each level of power module group through the optical fiber interface; the interface module receives the state data transmitted by each level of power module group at the same time, and after being parsed, the data is read by the main processor.

The invention belongs to the energy saving field of central heating, and discloses a thermal station energy saving device with double adjustment functions. The thermal station energy saving device with the double adjustment functions is characterized by comprising a double adjustment control master machine (1), an outdoor temperature sensor (2), a heat exchanger (3), a secondary water supply temperature sensor (6), a secondary return water temperature sensor (7), a secondary bypass pipe (4), a one-way electric adjusting valve (5), a secondary mixed water temperature sensor (8), a secondary mixed water pressure sensor (10), a secondary return water pressure sensor (11) and a water pump inverter (9). According to parameters obtained through monitoring of the outdoor temperature sensor, the open degree of the electric adjusting valve on the secondary bypass pipe is adjusted, a part of return water on the secondary side is enabled to enter the heat exchanger for heat exchanging, and the other part of the return water on the secondary side passes through the bypass pipe and can reach a predicted water supply temperature after being mixed with other water. According to parameters obtained through monitoring of the secondary mixed water pressure sensor and the secondary return water pressure sensor, an instruction is sent to the water pump inverter to adjust the running frequency of a water pump, and therefore the flow rate of the secondary water supply is changed. The thermal station energy saving device with the double adjustment functions achieves climate compensation control, supplies heat according to the needs of users, and reduces the quantity of electricity consumed by the water pump in the operation process.

The invention provides a vehicle air conditioner frequency conversion control system and a method thereof. A vehicle DC power supply is led directly; a stabilized voltage supply of the air conditioner is used to directly output a DC to a converter plant; each set of frequency transformators of the converter plant provides a threephase AC to a system unit of the air conditioner to drive each system unit of the conditioner to run in a mode of frequency conversion. The invention realizes the simplification of the conversion process of the vehicle air conditioner using the power supply, effectively reduces the energy consumption, raises the utilization efficiency of the power supply, greatly reduces the capacity of the power supply transfer device on the vehicle and reduces the volume of the air conditioner control circuit. The stabilized voltage supply of a voltage control module is directly led to the vehicle DC power supply; the DC power output terminal of the stabilized voltage supply is directly connected with the converter plant which is connected with an MCU by an asynchronous communication bus. The converter plant at least comprises two sets of frequency transformators; the power supply input terminals between frequency transformators are connected in parallel and are connected with the MCU by a common communication bus.

The invention discloses a rail transit air conditioner air supply assembly and a refrigerating / heating method, and belongs to the field of rail transit. The assembly comprises an air inlet, a fan, anair conditioner air supply pipeline, an air outlet, an air volume adjusting valve, an air pressure sensor and an air pressure buffer. Firstly, passenger feature information is acquired according to real-time image information in each compartment of a traffic vehicle; and then for different vehicle types and passenger distribution models, obtaining the air volume required below each air volume adjusting valve through CAE simulation, and calculating the rotating speed of the fan. And calculating the ventilation area of each air volume adjusting valve according to the heat required by the refrigeration / heating of the temperature field under each air volume adjusting valve, and finding out the opening angle corresponding to each air volume adjusting valve. The fan determines the rotating speedaccording to the total air volume required by all the different air outlets; Meanwhile, the air pressure sensor monitors air pressure fluctuation in the air duct in real time, buffering is conductedthrough the air pressure buffer, and large air pressure fluctuation is avoided. The air volume of each air outlet is different, the comfort level of passengers is improved, and unnecessary power consumption is avoided.

The invention discloses an intelligent voice remote control device for a crane. The intelligent voice remote control device for the crane is composed of a remote controller, a crane controller, a load sensor, a lifting frequency converter, a trolley frequency converter and a cart frequency converter. For a voice control instruction of a non-specific person, the intelligent voice remote control device for the crane can identify ten kinds of voices, namely 'proceed', 'retreat', 'left', 'right', 'hook lifting', 'hook lowering', 'stop', 'first speed', 'second speed' and 'third speed', of the non-specific person, and the ten kinds of voices are converted into corresponding digital control instructions to be transmitted to the crane controller for corresponding crane control, so that voice wireless remote control over the crane is achieved; the intelligent voice remote control device for the crane further is provided with ten buttons for control, so that the crane is wirelessly and remotely controlled; the intelligent voice remote control device for the crane achieves wireless remote control and frequency-converting speed adjustment through voice and button combination.

The invention discloses a control method and device of a frequency conversion window machine, a storage medium and intelligent equipment. The method comprises the following steps: determining a set temperature according to a start control instruction and the indoor temperature during the last closing, wherein the start control instruction is a control instruction for starting heating or a controlinstruction for starting refrigeration; judging whether energy requirements exist or not according to the current indoor temperature and the set temperature; and if the energy requirements exist, determining the working frequency of a compressor according to the energy requirements, and controlling the compressor to work according to the determined working frequency of the compressor. According tothe control method and device of the frequency conversion window machine, the storage medium and the intelligent equipment, the virtual set temperature is adopted in the control method of the frequency conversion window machine, and under the condition that the frequency conversion window machine controlled by a 24-V temperature controller cannot send temperature information, frequency conversioncontrol of the frequency conversion window machine is realized through a method of calculating the energy requirements through the temperature difference.

The invention relates to a same time base variable speed control and angle measurement method for a rocket engine two-way stepping motor. The variable speed control is triggered based on a timing signal and adopts multi-level interrupt nesting technology. On the basis of setting an interrupt priority level, an angle acquisition interrupt program is nested in a two-way motor speed control interruptprogram. Stepping pulse transmission of a two-way motor is completed in an interrupt service program. The operation control of speed-up, speed-down and smooth sections of a flow regulator or a fuel throttle valve are executed in sequence. Therefore, the real-time speed control and angel measurement problems under the same time base of the two-way stepping motor of the flow regulator and the fuelthrottle valve are resolved under the condition of minimum occupancy of processor system resources, interrupt conflict is avoided, and the safety of test run control is ensured.

The invention relates to a network intelligent multi-purpose emergency power supply (EPS) which comprises a three-phase supply detection circuit, a charge-discharge and control unit, a lithium battery pack, a temperature detection unit, a balancing and voltage detection unit, a main controller and an inverter. One path of the input end of a power grid is directly connected with the output end of an alternating current shunt circuit, one path of the input end of the power grid is connected with the lithium battery pack through the charge-discharge and control unit, and the other path of the input end of the power grid is connected with a contactor KM1 through the three-phase supply detection circuit. One path of the lithium battery pack is connected with the output end of the alternating current shunt circuit through the contactor KM1, a diode D1, the inverter and a contactor KM2 in sequence, and the other path of the lithium battery pack is directly connected with a direct current output end. The network intelligent multi-purpose EPS has the advantages that detection is achieved by means of a network intelligent data collector, all-digital modularization is achieved, a system is simplified, and intelligent performance and reliability are improved; frequency converting control is achieved through a frequency converter, the frequency converter can directly drive a motor load to achieve frequency control, and therefore the EPS can be used for driving a draught fan and a water pump.

The invention provides a refrigerator and a compressor control system thereof. The control system comprises an inverter compressor, a temperature detection module, a control panel and a frequency controller, wherein the temperature detection module is used for detecting the chamber temperature of the refrigerator so as to generate a chamber temperature detection signal; the control panel is arranged on a refrigerator body of the refrigerator and further used for receiving refrigeration demand information input by users; and the frequency controller is connected with the temperature detection module, the control panel and the inverter compressor, and the frequency controller can further control the operative condition of the inverter compressor according to the chamber temperature detectionsignal and the refrigeration demand information so that the chamber temperature of the refrigerator can meet the requirement of the refrigeration demand information. According to the compressor control system of the refrigerator in the embodiment of the invention, frequency converting control can be realized on the refrigerator without a main control panel; and meanwhile, the refrigerator temperature can be controlled quickly and accurately in accordance with the chamber temperature of the refrigerator and the refrigeration demand information, and refrigeration performance and energy efficiency of the refrigerator can be better improved.

The invention relates to an opposed hydraulic free piston engine with a hydraulic synchronizing mechanism and a driving method of the opposed hydraulic free piston engine. The opposed free piston engine comprises a high-pressure working medium liquid path, a low-pressure working medium liquid path, an electronic control unit, an oil sprayer, a gas inlet, an exhaust opening, a first cylinder sleeve, a second cylinder sleeve, a first piston matched with the first cylinder sleeve, a first piston rod connected with the first piston, a first high-pressure working medium output cavity connected withthe other end of the first piston rod, a second piston matched with the second cylinder sleeve, a second piston rod connected with the second piston, a second high-pressure working medium output cavity connected with the other end of the second piston rod, a high-pressure working medium liquid path, and the hydraulic synchronizing mechanism, wherein the first cylinder sleeve and the a second cylinder sleeve are coaxial and symmetrically distributed According to the opposed hydraulic free piston engine with the hydraulic synchronizing mechanism and the driving method of the opposed hydraulic free piston engine, a first synchronizing cavity and a fourth synchronizing cavity of the hydraulic synchronizing mechanism communicate, and a second synchronizing cavity and a third synchronizing cavity communicate, so that two synchronizing loops are formed; and due to the property that a liquid working medium is difficult to compress, mutual containing and mutual restraining are achieved, and the pistons on the two sides can synchronously move.

An intelligent power module for an air conditioner and the air conditioner are provided. The intelligent power module comprises a low-voltage area power supply positive end, a low-voltage area power supply negative end, a high-voltage power supply positive end, a high-voltage power supply negative end, a PFC interface, a direct-current interface and an alternating-current interface, and comprisesa first HVIC tube used for driving the compressor to work; a plurality of second HVIC tubes in one-to-one correspondence with a plurality of fans, with each second HVIC tube being used for driving thecorresponding fan to work; a PFC circuit respectively connected with the high-voltage power supply positive end, the high-voltage power supply negative end, the PFC interface and a PFC control signaloutput end; and a rectifier. According to the intelligent power module, the first HVIC tube, the plurality of second HVIC tubes, the PFC circuit and the rectifier are integrated into a whole, so thatthe frequency conversion control of the compressor and the plurality of fans is realized, a packaging process flow of the IPM can be simplified, the equipment cost is saved, and the production efficiency is improved.

The invention provides an oblique flow fan having an anti-corrosion effect to solve the problem that an existing oblique flow fan is not adapted to be used in a ventilating duct containing corrosive gas. The oblique flow fan adopts a brushless motor completely wrapped with general-purpose plastics, and the brushless motor is completely isolated from the corrosive gas, and is thus not eroded by thecorrosive gas. In addition, on the condition that the brushless motor is completely wrapped, ventilation and heat dissipation design is conducted, so that normal operation of the motor is ensured, nooverheating is caused, and the service life of the brushless motor is guaranteed; owing to a ventilation and heat dissipation structure, heat of a circuit board can be taken away, and normal operation of the circuit board can be ensured; furthermore, the shape of a movable impeller and the shape of a stationary impeller are designed by a three-dimensional flow theory, so that air pressure and theair quantity can be increased effectively, the air pressure can reach 400 Pa, the air quantity can reach 1800 m<3> / h, and the existing oblique flow fan in the market merely has the air pressure of 200 Pa and the air quantity of 1000 m<3> / h.

The invention discloses a power supply controller for an electromagnetic heating steam generator, comprising: a processor for collecting steam parameters and generating analog signals according to the parameters; a main power supply with a communication module for receiving Analog signal and real-time control of the output power according to the analog signal; the isolator, including a primary isolation transformer and a secondary isolation heater, used to connect the main power supply and the steam generator; the input end of the primary isolation transformer is connected to the main power supply , the output end is connected to the secondary isolation heater, which converts the electrical energy of the main power supply into magnetic energy and transmits it to the secondary isolation heater; the secondary isolation heater is distributed on the water pipeline of the steam generator, and converts the magnetic energy into induced eddy currents Heating water produces steam. It truly realizes the separation of water and electricity heating technology. Compared with gas and ordinary electric heating, the safety is greatly improved, the volume is smaller, and the equipment is convenient.

The invention discloses a frequency converting control method, device and system of a new energy car air conditioner and a new energy car. The method comprises the steps that target rotating speed sent by a frequency converting controller of the air conditioner is received, wherein the target rotating speed is calculated according to the temperature in the car and preset temperature; target powerfrequency is calculated according to the target rotating speed; when it is determined that the car is not in a steering state currently, a frequency converting instruction is generated according to the target power frequency, the frequency converting instruction is sent to an accessory controller, so that the accessory controller changes the power frequency of a main motor according to the frequency converting instruction, and the rotating speed of the main motor and the rotating speed of an air conditioner compressor are changed. According to the frequency converting control method, device and system of the new energy car air conditioner and the new energy car, the rotating speed of the main motor is monitored and compared with the target rotating speed, when the actual rotating speed ofthe main motor does not accord with the target rotating speed, the power frequency of the main motor is adjusted again, and therefore the variable rotating speed is achieved.

The invention relates to a compact spinning constant-voltage control device, and the device comprises a pressure sensor, a negative voltage frequency converter and a PLC, wherein the pressure sensor and the negative-voltage frequency converter are connected with the PLC. The device is characterized in that the output voltage end of the pressure sensor 1 is connected with an analog input interfaceof the PLC; the pressure sensor 1 is connected to a power interface of the PLC. The beneficial effects are that the device can provide a suitable negative voltage value according to actual conditions,thereby realizing frequency conversion control, and saving energy.

The invention provides a frequency conversion control system and method for a marine main seawater cooling pump. The system comprises a frequency converter control cabinet, three seawater pump motors, three seawater pump starters, a signal acquisition control box, a fresh water outlet temperature sensor and a seawater outlet temperature sensor. The sea water pump motors are respectively connected with the frequency converter control cabinet through the sea water pump starters; the fresh water outlet temperature sensor is mounted at a fresh water outlet of a central cooler, and the seawater outlet temperature sensor is mounted at a seawater outlet of the central cooler; and the fresh water outlet temperature sensor and the seawater outlet temperature sensor are connected with the frequency converter control cabinet through the signal acquisition control box. According to the frequency conversion control system and method for the main seawater cooling pump for the ship, frequency conversion control over three seawater pumps of a central cooling system of the ship is achieved through one frequency converter control cabinet and low initial investment, and energy consumption is reduced.

The invention relates to the field of energy-saving control of a central air-conditioning system, in particular to an energy-saving control cabinet of an air conditioning unit. The energy-saving control cabinet comprises a cabinet body and a cabinet door. A three-phase circuit breaker, three current transformers, a power frequency bypass contactor, a variable frequency switching contactor, a motor overload protector, a frequency converter, an intermediate relay and a single-phase miniature circuit breaker I are arranged on a lower mounting plate in the cabinet body. A single-phase miniature circuit breaker II, a direct-current switch power supply and an intelligent data processing unit are arranged on an upper mounting plate in the cabinet body. An intelligent operation touch screen is disposed on an upper cabinet door plate of the cabinet door. An alternating-current ammeter, an electricity meter, an alternating-current voltmeter, a signal indicating lamp, a manual frequency adjusting knob, a frequency operator operation panel, a start-stop button, a manual / automatic selection change-over switch, a three-phase main circuit breaker operating handle and a power frequency / variable frequency selection switch are disposed on a lower cabinet door plate of the cabinet door. By the energy-saving control cabinet, water valves and fans of the air conditioning unit can be intelligently controlled according to load changes, simplicity in mounting and debugging is realized, and energy-saving control on the air conditioning unit is realized.

The invention discloses a variable frequency magnetic variation speed device with a three-phase motor. The variable frequency magnetic variation speed device comprises the three-phase motor, a steering pump and a magnetic variable speed device, wherein the three-phase motor is connected with the power input end of the magnetic variable speed device; the powder output end of the magnetic variable speed device is connected with the driving shaft of the steering pump; and the output shaft of the three-phase motor and the driving shaft of the steering pump are positioned on a same axis. Furthermore, the variable frequency magnetic variation speed device also comprises a frequency converter which is connected with the power input end of the three-phase motor. The innovative design of the technical scheme is as follows: the three-phase motor, the magnetic variable speed device and the steering pump are integrally designed, and the variable frequency control over the motor is realized by virtue of the frequency converter, further the control over the steering pump lift is realized, and the variable frequency magnetic variation speed device can be applicable to various working places.

The invention discloses a bale breaker, a control method of the bale breaker, a material pretreatment system and a control method of the material pretreatment system. The bale breaker comprises a material conveying platform, a material pushing device which is used for pushing material bags to move forwards on the material conveying platform, a material bag height detection unit which is used for detecting the height of the material bags, a net breaking device which is arranged in the material conveying platform and used for breaking bag nets of the material bags, a bag net clamping device which is provided with a telescopic clamping end with adjustable height and is used for clamping the bag nets of the material bags, and a first control unit which is electrically connected with the material pushing device, the material bag height detection unit, the net breaking device and the bag net clamping device. By means of the bale breaker, the material bags can be automatically pushed through the material pushing device, and the height of the material bags can be detected through the material bag height detection unit, so that the clamping height of the bag net clamping device can be conveniently adjusted; and the bag nets of the material bags can be broken through the net breaking device, and therefore the bag net clamping device can clamp and take out the bag nets, and finally, the automatic disassembling process of the material bags is completed.

The invention discloses a variable frequency steering driving device with a three-phase motor. The variable frequency steering driving device comprises the three-phase motor, a steering pump and a magnetic variable speed device, wherein the three-phase motor is connected with the power input end of the magnetic variable speed device; the powder output end of the magnetic variable speed device is connected with the driving shaft of the steering pump; and the output shaft of the three-phase motor and the driving shaft of the steering pump are positioned on a same axis. Furthermore the variable frequency steering driving device also comprises a frequency converter which is connected with the power input end of the three-phase motor; and the magnetic variable speed device is provided with a shell in a sealed structure. The innovative design of the technical scheme is as follows: the three-phase motor, the magnetic variable speed device and the steering pump are integrally designed, and the variable frequency control over the motor is realized by virtue of the frequency converter, further the control over the steering pump lift is realized, and the variable frequency steering driving device can be applicable to various working places.

The invention discloses a container energy storage variable-frequency air conditioning unit for a direct-current power supply ship. The air conditioning unit comprises a direct-current power supply access port and a compressor module. The direct-current power supply access port is electrically connected with the compressor module, the compressor module comprises a compressor and a direct-current to alternating-current conversion device electrically connected with the compressor, and the direct-current to alternating-current conversion device is used for converting a direct current into an alternating current and transmitting the alternating current to the compressor. The direct-current power supply access port is arranged to access a direct-current power supply to the air conditioning unit, and the direct-current to alternating-current conversion device is arranged to convert the direct current into the alternating current and transmit the alternating current to the compressor so thatpollutant emission is effectively reduced, and a noise is low; and the alternating current output by the direct-current to alternating-current conversion device is only supplied to the compressor so that the demand for the alternating current is small, the size of the corresponding direct-current to alternating-current conversion device is small, the direct-current to alternating-current conversion device can be integrated in the air conditioning unit, independent arrangement is not needed, a space of the container is not occupied, and a space utilization rate of the container is effectively increased.

The invention discloses a power controller for an electromagnetic heating steam generator. The power controller comprises a processor, a main power source and an isolator. The processor is used for collecting steam parameters and generating an analog quantity signal according to the parameters. The main power source is provided with a communication module and is used for receiving the analog quantity signal of the processor and controlling output power in real time according to the analog quantity signal. The isolator comprises a first-level isolation transformer and second-level isolation heaters and is used for being connected with the main power source and the steam generator. The input end of the first-level isolation transformer is connected with the main power source. The output endof the first-level isolation transformer is connected with the second-level isolation heaters, and electric energy of the main power source is converted into magnetic energy to be transmitted to the second-level isolation heaters. The second-level isolation heaters are distributed on a steam generator water conveying pipeline, and the magnetic energy is converted into induced eddy currents to heatwater to generate steam. Water and electricity separation heating technology is really achieved, safety is promoted greatly than fuel gas and common electric heating, the size is smaller, equipment is convenient, meanwhile, frequency converting control is achieved, the supplied quantity is just the needed quantity, and energy waste does not exist.

The invention provides a water and fertilizer integrated fertilizer applicator detection device. The device comprises a water tank, a pumping device, a pressure stabilizing device, a test connecting device, a flow control unit, a detection master control system unit and a weighing device which are sequentially connected through a pipeline, the water tank is connected with the weighing device through a pipeline, a test solution is connected into the water and fertilizer integrated fertilizer applicator detection device through the test connecting device, and the detection master control systemunit is connected with the pumping device to control the pumping speed of the pumping device. The device is used for detecting the water and fertilizer integrated fertilizer applicator, and is high instability, high in measurement precision and efficient in product systematic test operation.

The invention discloses an intelligent power module with an input buffer anti-interference function, comprising a bridge driver chip, a first power device, a second power device, a third power device, a fourth power device, a fifth power device and a sixth power device which are connected with the bridge driver chip, and fly-wheel diodes connected with the power devices in a one-to-one correspondence manner. Corresponding to each power device, a filter circuit connected with the logic input end of the bridge driver chip and making the control signal of the logic input end stable and free of interference is arranged. Each filter circuit comprises a bypass capacitor, a filter capacitor, and a voltage stabilizing diode. The input anti-interference capability of the module is improved, the three-phase bridge power devices can work more reliably and more stably, damage to the three-phase bridge power devices inside the module due to instable input signals and external interference is prevented, and better frequency conversion control is realized.