165results about How to "Improve power factor" patented technology

The invention provides a power supply energy analysis method and system for a medium-voltage power distribution network. The method comprises the following steps: collecting multi-modal data of the medium-voltage power distribution network; constructing a health state evaluation model, and predicting a health score and a fault risk of the transformer of the medium-voltage power distribution network according to the fusion features after dimension reduction; constructing an optimization target of the power electronic equipment of the medium-voltage distribution network according to the health score and the fault probability of the transformer; constructing a multi-modal load prediction model to predict the load change of the power electronic equipment in the future; constructing a multi-objective optimization function, and generating an optimal scheduling strategy; and executing the optimal scheduling strategy to actually control the medium-voltage power distribution network equipment. According to the method, the defects of a traditional method in the aspects of equipment monitoring, load prediction and scheduling optimization are overcome, and the overall management level and coping capacity of a power grid are improved by introducing a leading-edge artificial intelligence algorithm and a data fusion technology.

The invention discloses an emergency power supply quick access method based on scene recognition, which relates to the technical field of emergency power supplies, and comprises the following steps: in an emergency power supply system, firstly obtaining electrical input parameter information through a preset detection frequency; by introducing a load change evaluation mechanism based on machine learning, the system can identify load fluctuation in real time and dynamically adjust the detection frequency, and the response speed to the rapid change of the load is improved. Compared with a traditional detection method, the load state is intelligently evaluated and accurately divided, it is ensured that the power factor is adjusted in time when the load fluctuates violently, and power loss and waste are reduced. Correction is carried out according to the traditional frequency during stable load fluctuation, the frequency is dynamically adjusted during rapid fluctuation, the electric energy use is optimized, the electric power quality is improved, and harmonic distortion and overload risks are reduced.

The invention relates to the technical field of photovoltaic power generation, and discloses a phase-locked loop-free photovoltaic power generation system multi-power quality cooperative improvement method and system, and the method comprises the steps: processing a collected current signal of a three-phase grid-connected point of a photovoltaic power generation system to obtain a current fundamental component and a current harmonic component of the grid-connected point, and determining a fundamental reactive power; determining the capacity required by harmonic suppression and the capacity required by reactive compensation according to the current harmonic component of the grid-connected point and the fundamental reactive power; obtaining the residual capacity of the photovoltaic power generation system, and carrying out an optimization algorithm to determine the optimal compensation coefficient of harmonic suppression and reactive compensation; and transmitting the optimal compensation coefficient of harmonic suppression and reactive compensation to a photovoltaic inverter control algorithm to complete multi-power quality collaborative improvement of the photovoltaic power generation system. The technical problems of large delay, slow control response speed, need of a phase-locked loop and poor power quality management target collaboration in the prior art are solved.

The invention provides a driving circuit, a driving controller and a lamp, the driving circuit comprises a load module, an energy storage module, a constant current control module and a sampling signal module, and the load module comprises a first load and a second load which are connected with a power supply module; the energy storage module is connected with a first load, the power supply module charges the energy storage module, and the energy storage module can supply power to the load module; the constant current control module comprises a first control unit and a fourth control unit which are connected in parallel with a second load, and a second control unit and a third control unit which are connected in series with the second load. The sampling signal module comprises a diode D1 and a sampling module which are arranged between the power supply module and the energy storage module, and the sampling module samples the output voltage of the power supply module and controls connection or disconnection of the first control unit, the second control unit, the third control unit and the fourth control unit. According to the invention, the energy storage module and the constant current control module are arranged, so that the load can realize constant current output when the voltage fluctuation is relatively large, and the stroboflash of the lamp bead during the voltage fluctuation is avoided.

The invention is suitable for the technical field of industrial power supply, and provides an energy saving and frequency modulation device for industrial power supply, which comprises an energy storage bidirectional converter P1, an energy storage inverter P4, a lithium iron phosphate battery module B1, a DCDC power supply P2, an energy type super capacitor C1 and a master control energy management system U1, one end of the energy storage bidirectional converter P1 and one end of the energy storage inverter P4 are connected to the output end of an external transformer in parallel, the other end of the energy storage inverter P4 is connected with one end of the energy type super capacitor C1, the other end of the energy type super capacitor C1 is connected with one end of the DCDC power supply P2, the other end of the DCDC power supply P2 is connected with a bidirectional current interface of the lithium iron phosphate battery module B1, and the other end of the lithium iron phosphate battery module B1 is connected with the bidirectional current interface of the lithium iron phosphate battery module B1. A one-way current interface of the lithium iron phosphate battery module B1 is connected with the other end of the energy storage bidirectional converter P1, and the master control energy management system U1 is in data connection with the energy storage bidirectional converter P1, the energy storage inverter P4, the lithium iron phosphate battery module B1, the DCDC power supply P2 and the energy type super capacitor C1.

The embodiment of the invention provides a reactive compensation controller and method for a distributed photovoltaic system. The controller comprises a signal acquisition module, a metering module and a digital controller. Wherein the output end of the signal acquisition module is connected with the input end of the metering module, and the signal acquisition module is used for acquiring power grid parameters in real time. The metering module receives data from the signal acquisition module and calculates a target parameter set according to the power grid parameters. The metering module transmits the target parameter set to the digital controller. And the digital controller is responsible for evaluating the current reactive vacancy of the power grid according to the received target parameter set. Meanwhile, the reactive power vacancy, the power factor and other related parameters of the power grid are comprehensively considered, and a reactive power compensation strategy is generated. The strategy can guide how to carry out the switching operation of the capacitor. According to the embodiment of the invention, the switching strategy of the capacitor can be dynamically adjusted, the problems of abnormal switching and low system power factor are effectively solved, and the overall operation efficiency of a power grid is improved.

The invention relates to an electric vehicle charging pile reactive power regulation method and system based on cloud processing. The method comprises the steps that real-time electric quantity and operation state data are collected through an intelligent electric meter and a charging pile; utilizing historical data and a machine learning algorithm to predict a reactive power regulation range meeting voltage safety constraints; based on the target power factor or the power grid adjustment instruction, establishing a reactive power optimization model, and calculating a reactive power distribution scheme of the charging pile; and issuing the optimization instruction to each charging pile for execution, and dynamically adjusting the strategy. The system comprises a data acquisition unit, a communication unit, a cloud processing unit, an instruction issuing unit and a user interface unit, and centralized management and optimization of reactive power regulation of the charging pile are realized. Compared with a traditional mode, the bidirectional reactive power regulation capability of the charging pile is fully utilized, the equipment investment is reduced, the energy efficiency is improved, high efficiency and flexibility are achieved, the requirement of a future power grid for reactive power regulation is met, and the wide application prospect is achieved.

The invention relates to a double half-Heusler alloy thermoelectric material with low lattice thermal conductivity and a preparation method thereof, the thermoelectric material is any one of a p-type thermoelectric material or an n-type thermoelectric material, the chemical formula of the p-type thermoelectric material is Sc0. 6V0. 5Co1-xNixSb, x is more than or equal to 0 and less than or equal to 0.12, and the n-type thermoelectric material is one of Sc0. 6V0. 5Co1-xNixSb. The chemical formula of the n-type thermoelectric material is Sc0. 5V0. 6Co1-yNiySb, wherein y is greater than or equal to 0 and less than or equal to 0.30. The preparation method comprises the following steps: mixing Sc, V, Co, Ni and Sb, grinding, sequentially carrying out sintering and vacuum packaging treatment to obtain a thermoelectric material wafer, and carrying out high-temperature annealing treatment on the thermoelectric material wafer to obtain the double half-Heusler alloy thermoelectric material with low lattice thermal conductivity. Compared with the prior art, the method has the advantages that the prepared double half-Heusler alloy thermoelectric material is replaced by the heterovalent elements, the Sc / V ratio is accurately regulated and controlled, p-type and n-type thermoelectric materials based on the same parent compound are successfully obtained, and the two materials both show promising thermoelectric performance.

The present invention discloses an intelligent control device for optimizing electric energy, comprising an intelligent controller, a mutual inductor, a plurality of inductors and a plurality of switching switches, wherein the mutual inductor is arranged on the existing three-phase circuit L1 line, a voltage detection unit is arranged in the intelligent controller, and the voltage detection unit is electrically connected to the existing three-phase circuit L2 and L3 lines, and a current detection unit is arranged on the intelligent controller, and the current detection unit is electrically connected to the mutual inductor, and is used to collect and detect the current generated by the mutual inductor, and obtain the phase difference by calculating the waveform of the voltage and the current, so as to determine the parameters of the inductor that should be switched, and then control the corresponding inductor to be connected to the three-phase circuit through the output of the multi-channel output control interface. The present invention can block the reactive current entering the resonance zone outside the zone to avoid the disturbance to the resonance zone, and is also conducive to the control of the parameters of the electric optimizer in the resonance zone and maintain the stability of the resonance zone.

The invention discloses a multi-standard power supply system and method for a locomotive test, and relates to the technical field of test power supplies, and the structural design of the system is as follows: an input power supply is a three-phase alternating current 10kV power supply; the high-voltage switch K realizes access control and isolation of the system and a public power grid, the connection reactor L realizes energy buffering and inhibits switch ripples in output current, and the soft charging circuit pre-charges the three-stage converter. The three-level converter converts three-phase alternating current 10kV into DC1500 / 750V and outputs the DC1500 / 750V to the direct-current bus, one path of the direct-current bus supplies power to a subway vehicle test line, and the other path of the direct-current bus is inverted into single-phase alternating current 25kV through the output inverter and supplies power to a railway locomotive test line. According to the invention, alternating current test conditions of railway electric traction locomotive vehicles and direct current test conditions of subway vehicles can be satisfied, reliability and quality of power supply are ensured, repeated construction is reduced, and resource waste is avoided.

The invention provides a control system and a control method of a BUCK type PFC (Power Factor Correction) circuit. In the control system, alternating current voltage is input to one side of a rectifying unit, and the other side of the rectifying unit is coupled with one side of a first filtering unit; the other side of the first filtering unit is coupled with one side of the BUCK type PFC circuit; the other side of the BUCK type PFC circuit is coupled with one side of the composite filtering unit; the other side of the composite filtering unit is used for being coupled with a load end; the control unit is used for collecting the output voltage and the output current of the rectification unit and the output voltage of the composite filtering unit; and the control unit is also used for outputting a PWM control signal to the BUCK type PFC circuit through a feedforward and nonlinear control algorithm according to the output voltage and the output current of the rectification unit and the output voltage of the composite filtering unit, and the PWM control signal is used for controlling the on-off of a switching tube in the BUCK type PFC circuit. By means of the control system, the problem that in the control mode of the BUCK type PFC circuit, it is difficult to enable the circuit to reach a high power factor while the low-current THD of the circuit is guaranteed is solved.

This invention discloses a phase-shifted full-bridge plasma power supply based on all SiC devices, belonging to the field of special power supply technology. It includes: a rectifier unit with a power factor correction circuit; an inverter unit containing a phase-shifted full-bridge topology composed of SiC power devices and an energy storage inductor, achieving zero-voltage switching through phase-shift control; a transformer unit; an output unit including an output filter capacitor; and a control unit that uses an incremental PID algorithm to generate phase-shift control signals. This invention analyzes the differences in zero-voltage switching between the leading and lagging bridge arms, utilizes the low output capacitance characteristics and dynamic dead-time adjustment of SiC devices, broadens the soft-switching range under light loads, effectively reduces output current ripple, and improves dynamic response speed and overall efficiency.

The utility model is suitable for the technical field of electronic circuits, and provides a dimming circuit of a multi-section light emitting diode and lighting equipment, the circuit comprises a power supply output circuit, a whole-section light emitting diode LED, an LED dimming circuit and an LED constant-current driving circuit, the power supply output circuit is connected with the whole-section LED comprising a plurality of sub-section LEDs and used for providing power for the whole-section LED, and the LED dimming circuit is connected with the LED constant-current driving circuit. Outputting a line network voltage value; the LED dimming circuit is respectively connected with the power supply output circuit and the whole section of LED and is used for sampling the network voltage value and the whole section of voltage difference value of the whole section of LED and respectively outputting a silicon controlled rectifier control signal value and a dimming voltage value; and the LED constant-current driving circuit is respectively connected with the LED dimming circuit, each sub-segment LED and the power supply output circuit, and is used for providing constant current for each sub-segment LED according to the dimming voltage value and determining to open or close a silicon controlled discharge circuit in the LED constant-current driving circuit according to the silicon controlled control signal value. Therefore, the linearity of low-luminance dimming is effectively improved.

The invention discloses a power supply method, device and equipment for a main transformer to low switching system and a medium. The power supply method comprises the step of determining the load information of the main transformer to low switch according to the ratio of the current current information to the safety current information of the main transformer to low switch. And comparing the load information with the first safety threshold information and the second safety threshold information. And when the load information is greater than or equal to the first safety threshold value information and less than or equal to the second safety threshold value information, adjusting the reactive power of the main transformer to low switch through the reactive power adjusting device, and adjusting the bus voltage of the bus to be within a first range through the on-load voltage regulating transformer. Thus, the load information of the main transformer to low switch is monitored in real time, the reactive power of the main transformer to low switch system is balanced in advance so as to improve the power factor of the main transformer to low switch system, and meanwhile, the bus voltage of the bus is adjusted to be within the first range through the on-load voltage regulating transformer, so that the reliability of the main transformer to low switch system is improved.

The present invention discloses a control method and control method for the rotor position angle of a permanent magnet synchronous motor, wherein the control method is to establish a sliding mode model to obtain a position angle estimation equation. By collecting the stator current signal of the permanent magnet synchronous motor, the rotor position can be effectively calculated to achieve sensorless setting, and after collecting the current and voltage, the protection circuit is input to achieve additional protection on the hardware, wherein the protection circuit 10 is electrically connected to the controller or the protection signal is directly input into the PWM drive module 9 to control the enabling of the PWM signal. Once a fault signal appears, the PWM signal is directly blocked to achieve the hardware protection function, and the direct drive method is adopted to reduce the possibility of interference interruption caused by the control board fault.

The present application provides a reactive compensation control method and system based on the reverse transmission of photovoltaic reactive power, which includes: measuring the load current forward and reverse controllers to measure the voltage and current phase angles based on the load current forward and reverse, and obtain various related current data in the power supply mode; setting the control strategy of the load current forward and reverse controllers in the power supply mode; based on the load current forward and reverse measurement of the voltage and current phase angles, obtain various related current data in the power generation mode; setting the control strategy of the load current forward and reverse controllers in the power generation mode. The present application provides control strategies under different flow conditions, and realizes the precise control and switching of capacitor compensation under the condition of photovoltaic reactive power reverse transmission, that is, it can realize the inaccurate switching control of the original compensation control strategy, realize more accurate control of reactive power, and improve the bus power factor.

The application discloses a power supply with an on-board rectification correction module, comprising an input filter module, a surge suppression module, a PFC rectification correction module and an output filter module; the input end of the input filter module inputs a 115Vac voltage; the output end of the input filter module is connected with the input end of the surge suppression module; the output end of the surge suppression module is connected with the input end of the PFC rectification correction module; the output end of the PFC rectification correction module is connected with the output filter module; and the output filter module can output a 260Vdc voltage. The 115Vac alternating current is converted into a pure and stable 260Vdc direct current output, the system tolerance to power grid surges and subsequent faults is significantly enhanced, and the strict requirements of the industrial, aviation and server fields on high-performance power supplies are met.

The present invention discloses a high PF brushless DC motor drive system based on a bridgeless buck PFC converter, and relates to the technical field of brushless DC motor drive systems; the brushless DC motor drive system comprises a rear-stage inverter, a brushless DC motor and a front-stage bridgeless buck PFC converter; the topological structure of the front-stage bridgeless buck PFC converter comprises a buck conversion unit, a buck-boost conversion unit and an intermediate bus capacitor C o The buck conversion unit includes a switch tube S1 and a rectifier diode D R1 , diode D1, and inductor L1 are used for power conversion in the negative half cycle of AC input; the buck-boost conversion unit includes switch tube S2, rectifier diode D R2 , diode D2, and inductor L2 are used for power conversion in the positive half cycle of AC input; the front-stage bridgeless buck PFC converter realizes positive and negative bipolar AC input and unipolar DC output through buck conversion unit and buck-boost conversion unit; by controlling the output voltage V o , realizing closed-loop control of brushless DC motor speed.

The utility model provides a low-voltage LED lamp with a constant current effect, which is characterized in that the low-voltage LED lamp comprises a constant current CRD which has a constant current function, is connected with a load to provide a constant path current, and is connected with a constant current source to improve a power factor; the constant-voltage power supply is used for providing constant voltage and fluctuating current; the constant-current capacitor can be connected with the constant-current CRD to form constant voltage and current for a load; the constant-current power supply is used for providing constant current and fluctuation voltage; the constant-current capacitor can be connected with the constant-current CRD and then connected to commercial power to form constant voltage and current for a load; and the LED group comprises a plurality of LED lamps, and the LED lamps can be freely connected in series and in parallel when being matched with the constant-current CRD.

The invention relates to the technical field of power loss compensation, in particular to an intelligent control compensation system for container energy storage based on power loss, which comprises an energy storage container and comprises a monitoring module; a data analysis module; a compensation module; the control module is used for judging the discharge loss of the energy storage container according to the battery temperature in the energy storage container, and determining a loss processing mode according to the judgment result of the discharge loss, including adjusting the heat dissipation power of the heat dissipation unit, or adjusting the switching times of the switching unit according to the sudden change of the current at the load end, or determining the loss processing mode according to the judgment result of the discharge loss. Adjusting the update scene superposition number of the compensation analysis model according to the difference quantity of the compensation results of the same scene at different times; and adjusting the power-on delay duration of the switching unit according to the voltage variation of the switching unit under a preset condition. The energy storage discharge power consumption and the load circuit power loss degree are reduced, and the stability of the compensation process is improved.

The present application relates to the technical field of air extractor, particularly relates to a direct drive improvement device of oil pumping unit; including tower body, platform, driver, shaft coupling, drum, crown assembly, belt, oil pumping rod, counterweight box and liquid cooling mechanism, the liquid cooling mechanism includes motor shell cooler, the platform is fixedly arranged on the top of the tower body, the driver, crown assembly and motor shell cooler are all fixedly arranged on the platform, the drum is rotatably arranged on the platform and located on one side of the driver, the driver and drum are drivingly connected through the shaft coupling, the crown assembly is located on one side of the driver, shaft coupling and drum, the belt is slidably arranged on the drum and crown assembly, the oil pumping rod and counterweight box are respectively fixedly arranged at two ends of the belt, the oil pumping rod is located on one side of the tower body, and the counterweight box is located below the platform; energy consumption is significantly reduced, frequent maintenance is not needed, and mechanical noise of the traditional reduction gearbox is eliminated.

The utility model provides a photovoltaic SVG dynamic compensation cabinet, which comprises a compensation cabinet main body and a capacitor, an operation control box is arranged in the compensation cabinet main body, a high-voltage load switch is arranged above the operation control box, a vacuum contactor is arranged below the operation control box, and the capacitor is arranged above the high-voltage load switch. An SVG module is installed below the vacuum contactor and located below the left side of the compensation cabinet body, a first inversion power unit and a second inversion power unit are arranged on the right side of the operation control box side by side, a centrifugal fan is installed at one end of the top of the compensation cabinet body, and one end of the centrifugal fan is connected with an air pipe. The capacitor is located in the middle of the interior of the compensation cabinet body. According to the utility model, the SVG dynamic reactive power compensator is adopted, the power factor of a power grid can be monitored in real time, accurate reactive power compensation can be provided according to requirements, and the SVG dynamic reactive power compensator can help a photovoltaic power generation system to maintain a high power factor and improve the power generation efficiency by adjusting the phase difference between current and voltage.

The permanent magnet full-cross-flow submersible pump comprises a water suction cover, an impeller rotor assembly, a stator assembly and a water drainage cover, and the impeller rotor assembly is provided with an isolation cylinder which is rotatably arranged between the stator assembly and the water drainage cover; a plurality of blades which are rotatably connected with the wheel shaft through the wheel carrier are distributed in the isolation cylinder in a surrounding mode, a motor rotor is arranged outside the isolation cylinder, the stator assembly is provided with a machine shell, the two ends of the machine shell are fixed to the stator assembly and the drainage cover respectively, and a stator iron core arranged outside the motor rotor in a sleeving mode is installed in the machine shell. A stator coil connected to a power supply through a cable is wound outside the stator iron core, so that the power factor is high, and the influence of iron-containing impurities in water is not easily caused.

The invention relates to the technical field of power electronics, and discloses a power factor correction method and system for an LED power supply. The method comprises the steps that an analog-digital hybrid control circuit based on a memristor is constructed, and PFC loop parameters are adjusted in real time by means of the non-volatile resistance change characteristic of the analog-digital hybrid control circuit; acquiring running state data and inputting the data into the control processor; optimizing memristor configuration by taking the power factor, the total harmonic distortion rate and the efficiency as fitness functions through a genetic algorithm; dynamically applying a voltage pulse to accurately adjust the resistance value of the memristor; and continuous self-tuning is carried out based on closed-loop feedback. The system comprises a memristor programmable gain amplifier, a sensor, a control processor and a health monitoring module. According to the scheme, hardware-level rapid, fine and self-adaptive PFC parameter regulation and control are realized, and the power factor stability, the system efficiency and the long-term reliability are improved.

The invention relates to the technical field of intelligent household appliances, and discloses a control method for a power factor correction circuit, and the method comprises the steps: obtaining a starting state of an inverter load; if the inverter load is not started, determining the input voltage of the phase-locked loop according to the current input voltage and the current input current of the power factor correction circuit; and if the inverter load is started, determining the input voltage of the phase-locked loop according to the current input voltage of the power factor correction circuit. By acquiring the starting state of the inverter load, the phase-locked loop input voltage corresponding to the starting state of the inverter load is obtained, so that the phase-locked loop input information is more accurate and reliable, the accuracy of phase-locked loop control is improved, and the power factor of the power factor correction circuit is improved. The invention further discloses a control device for the power factor correction circuit, an intelligent household appliance and a storage medium.

The application discloses a Sepic type power correction circuit based on a switched inductor, which comprises switching tubes S1-S3, diodes D1-D5, inductors L1-L5, capacitors C1 and C o The diodes D3-D5 and the inductors L4 and L5 form a switched inductor structure, and the voltage gain of the converter is D / (2-D). Compared with a conventional Sepic PFC converter, the Sepic type power correction circuit based on the switched inductor improves the step-down gain, ensures that the whole duty cycle range is in a step-down state, and has a larger duty cycle than the conventional Sepic PFC converter in the case of a high step-down ratio, thereby effectively avoiding the emergence of a limit duty cycle. The no-bridge structure can realize lower conduction loss. The original output diode is replaced by the switched inductor structure, so that the output current is continuous, and the output current can be filtered. All the switching tubes are common ground, and a lower-cost driving circuit can be used.

This invention provides an integrated power flow regulation device and its control strategy, belonging to the field of power systems; it solves the problem of complex flexible DC transmission topologies; the specific control strategy is as follows: The voltage, inductor current, and DC bus voltage of grid 1 are acquired, and the dq current component is obtained through SOGI-PLL synchronization and coordinate transformation; based on the DC voltage of grid 1 and the given value of reactive power compensation, PI and ADRC control are performed, and a modulated wave U is output. ab‑ref The electrical quantities and power of the power grid are acquired, and after synchronization, coordinate transformation, and PI control, a modulated wave U is output. cb‑ref , will U ab‑ref with U cb‑ref Decoupling is performed to obtain the modulation waves of the three bridge arms, and SPWM is used to generate the pulse signal to drive the IGBT. This invention realizes the power flow regulation of two adjacent power grids through an integrated power flow regulation device, which reduces the circuit complexity of power flow regulation when the two power grids are asynchronously interconnected, and reduces the number of switching devices and operating losses.

The utility model belongs to the field of audio power amplifiers, and discloses a filter circuit of an electronic tube power amplifier switching power supply, which comprises an alternating current filter circuit, a full-wave rectifier circuit for converting power frequency alternating current into direct current, and a direct current filter circuit, and an alternating current input end of the full-wave rectifier circuit is connected with the alternating current filter circuit through the alternating current filter circuit. The direct-current output end of the full-wave rectification circuit is connected with the direct-current filter circuit; the filter circuit of the electronic tube power amplifier switching power supply adopts a'double-pi-type 'filter mode of a pi-type alternating-current filter circuit and a pi-type direct-current filter circuit, and has the advantages of simple circuit structure, high efficiency and reasonable design, and in the pi-type direct-current filter circuit, a power frequency inductor adopts a large inductor of a millihenry level, the direct-current output ripple is relatively small, and the filter circuit is stable and reliable. The direct-current voltage at the two ends of the filter capacitor is high, and the current distortion correction and power factor compensation capabilities are improved, so that the power factor of the electronic tube power amplifier switching power supply is effectively improved, and meanwhile, the ground noise level of a power amplifier is also reduced.

The utility model relates to the technical field of suspension door controller, concretely to low pressure direct current brushless suspension door controller, include: wide voltage DC / DC module, its input end access 24V~48V power, output 12V direct current voltage, 5V linear voltage stabilizing circuit, its input end is connected with the 12V output of wide voltage DC / DC module, and output end exports 5V direct current voltage. In the utility model, adopt direct current brushless motor, can realize stepless speed regulation, and starting torque is big, and power factor is high, and efficiency is high, can make suspension door in low speed - high speed - low speed arbitrary smooth switching, and running noise is reduced obviously, can reduce mechanical wear and tear, prolong integral machinery life, simultaneously, it need not rely on operating capacitor, is not affected by the influence of the capacitor capacity drop under low temperature environment, can stably operate in various severe weather, and can satisfy long time continuous work demand, solve the existing single -phase alternating -current motor torque unstable, speed is difficult to control, error accumulation influence precision and the problem of normal operation under low temperature.