46results about How to "Reduce the rate of change" patented technology

The invention discloses an indoor fan control method for an air conditioner. The indoor fan control method comprises the following steps: acquiring and storing indoor temperature of the environment in which the air conditioner is positioned in real time or periodically; calculating the change rate of the indoor temperature according to the acquired and stored indoor temperature, and acquiring the rotating speed corresponding to the change rate, wherein the change rate of the indoor temperature is greater, the rotating speed of an indoor fan is lower; adjusting the current rotating speed of the indoor fan to be the acquired rotating speed. The invention also discloses an indoor fan control device for the air conditioner, when the indoor temperature changes greatly, the change rate of the indoor temperature is reduced by reducing the rotating speed of the indoor fan, so that the indoor temperature is prevented from changing too quickly; the temperature is controlled stably; meanwhile, a compressor is not required to be started and stopped frequently, so that the service life of the compressor is prolonged.

The invention provides a dynamic regulation apparatus for a driving signal. The driving signal is used for driving an MOS switch tube to be switched on and switched off; the dynamic regulation apparatus comprises a pull-up MOS tube, a pull-down MOS tube and a controlled voltage source module, wherein a gate end receives a pull-up control signal used for controlling the gate end to be switched on and switched off; one of a source end and a drain end is coupled to a power supply voltage end while the other one of the source end and the drain end is coupled to a gate end of the MOS switch tube; the gate end receives a pull-down control signal used for controlling the gate end to be switched on and switched off; one of the source end and the drain end is coupled to a circuit ground end while the other one of the source end and the drain end is coupled to the gate end of the MOS switch tube; the controlled voltage source module is used for providing controlled voltage to the gate end of the pull-down MOS tube to enable the gate-source voltage of the pull-down MOS tube to be elevated to the power supply voltage at a dynamically adjustable speed when the pull-down MOS tube is started by the pull-down control signal, so as to drive the MOS switch tube to be switched on and switched off with variable driving capabilities.

The invention relates to a method and system for suppressing torque ripple of a brushless DC motor. The method comprises the steps: acquiring Hall signals collected by a Hall sensor in the brushless DC motor and a three-phase phase current in the operation process of the brushless DC motor, judging whether the brushless DC motor is in a phase change state or not according to the Hall signals and the three-phase phase current: if not, controlling a voltage type inverter in a two-two conduction control mode, or else controlling the voltage type inverter in a two-two conduction and three-three conduction switching control mode. At the commutation stage, only one switching tube is changed through the two-two conduction and three-three conduction switching control mode, and the torque ripple generated by the brushless DC motor in commutation is effectively restrained. Due to the fact that the two-two conduction control mode and the three-three conduction control mode are matched with each other, a dead zone does not need to be set, the suppressing effect of torque ripples is better, the detection method and the control algorithm are simpler, the calculation difficulty is lower, the costis lower, and the control efficiency is higher.

The invention relates to the DC conversion technology and aims to provide a method for suppressing the bias current of a magnetic element of a dual active bridge converter. The method is characterizedin that at least one of a steady state current controller or a transient current controller is added to a control circuit of the dual active bridge converter, the steady state current controller canmake difference between an average value of the transformer current and zero, a switch tube driving duty ratio compensation signal is generated by a compensator and is used for superimposing with an original 50% driving duty ratio to generate a final PWM signal, the transient current controller is used for performing threshold comparison, pulse signal generation and logic operation, and a drivingsignal generated by the transformer can reverse a voltage of a primary or secondary side of the transformer in advance to suppress the instantaneous current amplitude. The method is advantaged in thatthe method can simultaneously suppress the steady and transient bias current in the magnetic element of the DAB converter, reduces switching and conduction loss caused by the bias current, improves reliability of the DAB converter, removes a traditional DC blocking capacitor used to suppress the bias current and significantly reduces the size of the DAB converter.

The invention provides a controller, a method for controlling a heater body and an electric heater. The controller is applied to the electric heater and comprises a temperature regulation module, a main control chip and a switch tube, wherein the temperature regulation module is configured to receive target temperature input by a user, detect environment temperature of an area in which the heater body is located, calculate the temperature difference of the target temperature and the environment temperature and send the temperature difference to the main control chip; the main control chip is configured to calculate a target duty ratio according to the temperature difference when the received temperature difference is less than a set temperature value and send a pulse signal to the switch tube according to the target duty ratio; the switch tube is configured to be communicated and disconnected periodically according to the received the pulse signal, so that an external AC (alternating current) power module is enabled to periodically supply working voltage to the switch tube. According to the technical scheme of the invention, the change rate of the environment temperature of the area, in which the heater body is located, is relatively low, and the comfort level of human bodies is improved, so that the user experience is improved.

The invention provides a high-voltage battery temperature adjusting system and method as well as a vehicle. The high-voltage battery temperature adjusting system comprises a high-voltage battery assembly and a CCU, wherein the high-voltage battery assembly comprises a high-voltage battery, a battery fan and a detection element, and the detection element is used for detecting the air inlet temperature and the current battery temperature of the high-voltage battery; the CCU comprises an acquiring module, a storage module, a determining module and an informing module, the acquiring module is usedfor acquiring the air inlet temperature and the current battery temperature of the high-voltage battery; the storage module is used for storing a preset first temperature threshold interval; the determining module is used for determining the rotation speed of the battery fan based on the air inlet temperature and the current battery temperature when the current battery temperature is out of the preset first temperature threshold interval; and the informing module is used for informing the high-voltage battery assembly of the determined rotation speed of the battery fan to drive the battery fan to work at the determined rotation speed so as to adjust the temperature of the high-voltage battery. According to the high-voltage battery temperature adjusting system, the temperature adjusting efficiency of the high-voltage battery can be improved based on multi-stage rotation speeds of the fan.

The invention relates to a control device applied in a power factor correction power converter and a control method thereof. The control device is used for reducing the change rate of a reference signal with an ascending part and a descending part when an input voltage approaches zero potential. When a main winding releases approximately all stored energy and the descending part of the reference signal reaches a condition, the control device turns on a changeover switch to increase the stored energy of the main winding.

The invention discloses a hot-dip galvanizing method for obtaining colored plating on flat steel. The method comprises the following steps of preparing alloy plating solution with special element proportion, placing the flat steel subjected to the surface pre-treatment in the hot plating solution at the rate of 0.01 m/s-0.03 m/s, carrying out immersion plating at the temperature of 430-560 DEG C for 0.5 min-10 min, taking out the flat steel from zinc liquid at the same rate, and carrying out air cooling and water cooling so as to obtain the colored coating which is uniform and single in color,good in surface smoothness and free of mixed color. According to the method, the steel can be divided into thin flat steel and thick flat steel according to the thickness of the steel, characteristics of a steel structure are fully analyzed, and technological parameters such as the immersion and leaching rate and the immersion plating temperature are regulated and controlled; the colored platingobtained through the colored hot-dip galvanizing carried out on the flat steep with different thickness and width is uniform in thickness, is stronger than that obtained through colored coating technology in terms of corrosion resistance and weather resistance, is stronger than that obtained through colored passivation technology in terms of adhesion and wear resistance, and is far higher than that obtained through original colored hot-dip galvanizing technology in terms of color uniformity; and the method is simple in process, easy to control, high in manufacturability, low in cost and wide in industrial popularization prospect.

The invention relates to a multi-stage waterproof transformer substation with temperature and humidity regulation and control. The multi-stage waterproof transformer substation with temperature and humidity regulation and control comprises a box body, a supporting seat fixedly installed at the lower end of the box body, a waterproof system, a gap layer, a ventilation layer, a detection system and a control system, wherein the gap layer and the ventilation layer are arranged on the side face of the box body. The supporting seat isolates the box body from the ground. The waterproof system comprises a drainage top cover, a water level valve, a water storage tank, a water guide pipe and a spray head. A ventilation layer is arranged on the side wall of the box body and comprises a plurality of fans, exhaust holes and hole plugs. The detection system comprises a temperature detector A, a humidity detector A, a particle density detector A, a temperature detector B, a humidity detector B and a particle density detector B. According to the multi-stage waterproof transformer substation with the temperature and humidity regulation and control function, the control system controls the waterproof system and the ventilation layer according to the temperature, humidity and dust amount inside and outside the box body, effective water prevention is achieved, rainwater is collected to assist heat dissipation, a fan strengthens heat dissipation, and normal operation of the transformer substation is guaranteed.

The embodiment of the invention provides a self-adaptive variable load instruction generation method and device based on thermal inertia of a coal-fired power plant, and belongs to the technical fieldof variable load control. The method comprises the steps of determining a target load in response to a received variable load instruction; obtaining an initial load of a coal-fired power plant; calculating the current load increment of the coal-fired power plant according to a load increment function, wherein the load increment function is an S curve function; and generating the load instructionof the coal-fired power plant according to the initial load, the target load and the current load increment. According to the method, a variable load instruction is change gently in a variable load initial stage, the variable load rate changes quickly in a variable load middle stage, and at a variable load end, the variable load instruction change rate is reduced in advance, so that the problems that in the linear variable load process, due to thermal inertia, the boiler efficiency is reduced, steam-water parameters are unstable, and the control effect is poor are effectively solved.

The invention discloses a luminous composition for a metal halide lamp, the luminous composition includes sodium iodide, thallium iodide, indium iodide, scandium iodide and thulium iodide, and the molar ratio of the sodium iodide, the thallium iodide, the indium iodide, the scandium iodide and the thulium iodide is 0.3-1.4:1.0 * 10<-3>-1.4 * 10<-2>:2.0 * 10<-3>-5.0 * 10<-3>:0.02-0.40:2.0 * 10<-3>-1.2 * 10<-2>. The luminous composition for the metal halide lamp is high in luminous efficiency and less in influence on the using effect. The invention also provides a luminous pill for the metal halide lamp and a preparation method thereof.

A method for determining a real-time discharge current allowable value of a power battery comprises the following steps: S1, after a battery management system is powered on, the discharge current allowable value is a 30s peak current; s2, when the actual current of the vehicle is larger than the current allowable continuous discharge current value of the power battery and lasts for 30 s, the discharge current allowable value is reduced according to the change rate of 30 A/s until the change rate is reduced to the continuous discharge current value under the current temperature of the battery core and the current charge state; if the variable quantity of the discharge current allowable value is lower than 5A, jumping is directly carried out; s3, when the vehicle speed is reduced, the actual current of the whole vehicle is smaller than 0.7 time of the current allowable continuous discharge current value of the power battery, and the continuous discharge current value lasts for 2 s, the discharge current allowable value directly jumps from the continuous discharge current value to 30 s peak current; and S4, the steps S2 and S3 are circulated until the battery management system BMS is powered off. According to the design, the over-current problem of battery discharge is solved, and the control strategy is simple.