36results about How to "Achieve constant power output" patented technology

The invention relates to a full digital electromagnetic heater, which comprises an electromagnetic heating control system. The electromagnetic heating control system comprises a current detection unit (1), a main control unit (2), a pulse generating unit (3) and an inverter unit (4), and the current detection unit (1) samples the working current of an inductive load and sends the sampled current to the main control unit (2); the main control unit (2) controls the pulse generating unit (3) to generate a pulse width according to the magnitude of the sampled current; and the inverter unit (4) controls a switching tube in the inverter unit to open and close according to the magnitude of the pulse width, thus carrying out inversion to generate an alternating voltage acting on the inductive load. In the full digital electromagnetic heater, the main control unit monitors working parameters of the inductive load in real time, realizes automatic sweep frequency and ensures the inductive load to work in a resonance state, thus enhancing the power factor; and the functions of over-current protection, over-voltage protection and over-temperature protection are realized by the full digital control.

The present invention provides a single-segment linear constant-power LED (light-emitting diode) driving circuit and a method. The circuit includes a voltage input module, an LED load, a power switching tube, a sampling resistor, an overvoltage control module which is used for detecting the drain-end voltage of the power switching tube, a current control module which is used for limiting the peak current of the LED load, and a comparison module. According to the single-segment linear constant-power LED (light-emitting diode) driving circuit and the method, when input voltage is larger than the conduction voltage of the LED load, the current control module limits the peak current, so that a current average value in different input voltage periods can be constant; when the input voltage is larger than a set value, current flowing through the LED load is turned off, and therefore, power consumption can be decreased; and when the input voltage is smaller than the conduction voltage of the LED load, the LED load is turned off. According to the single-segment linear constant-power LED (light-emitting diode) driving circuit and the method of the invention, the control of average current in alternating current periods is realized by using a compensation capacitor, the peak current is limited, and therefore, constant power output in a wide input voltage range is realized; and the turn-off voltage and turn-off slope of the LED are adjusted through an external resistor, and therefore, the high efficiency of the system can be realized, and the electromagnetic interference performance of the system can be optimized.

The invention provides an automatic voltage regulating circuit for a solar photovoltaic power generation system. The circuit comprises an auxiliary power circuit, an input voltage regulating capacitor, a voltage boosting inductor, an insulated gate transistor, a freewheel diode, a first diode, a second diode, a control drive circuit, an output voltage regulating capacitor, a load and a sampling circuit, wherein the voltage boosting inductor is connected with the input voltage regulating capacitor and the insulated gate transistor; the insulated gate transistor is connected with the control drive circuit and the input voltage regulating capacitor; the freewheel diode is connected with the insulated gate transistor; the first diode and the second diode are connected with the insulated gate transistor and the load; the output voltage regulating capacitor is connected with the first diode, the second diode and the freewheel diode; the load is connected with the output voltage regulating capacitor and an acquisition circuit respectively; and the acquisition circuit is connected with the input voltage regulating capacitor, the load, the output voltage regulating capacitor and the control drive circuit. The invention also provides an automatic voltage regulating method for implementing the method. Constant power output and power supply to the load can be realized without support of asinglechip.

The invention discloses a high-precision constant power DC power supply including a fixed DC voltage stabilization power supply, a BUCK conversion circuit, a discharging circuit, a driving circuit, apulse control circuit, a current sampling circuit, a voltage sampling circuit, an MCU control circuit, an ADC circuit, a DAC circuit, a current differential circuit and a voltage differential circuit.The constant power output can be achieved, the output characteristics of high voltage and low current or high current and low voltage can be achieved, the ADC and DAC can be used to achieve high-precision output collection and high-precision control output, and the high-precision requirements of power remote end load adjustment can be satisfied at the same time.

The invention discloses a low-frequency electronic ballast for a high-intensity gas discharge lamp HID, which comprises an EMI interference suppression circuit, a rectifier and filter circuit, a power factor correction APFC circuit, a DC/AC conversion circuit, an output circuit and a control circuit, which are sequentially connected, wherein the control circuit is respectively connected with the DC/AC conversion circuit and the output circuit, and a DC/DC step-down circuit is also connected between the power factor correction APFC circuit and the DC/AC conversion circuit; and the power factor correction APFC circuit is also connected with a low-voltage regulator circuit, and the low-voltage regulator circuit is respectively connected with the DC/DC step-down circuit, the control circuit, the DC/AC conversion circuit and the output circuit. The low-frequency electronic ballast of the invention has the advantages of reliable and stable work, high efficiency and prolonged service life of the lamp, and can eliminate the acoustic resonance and stroboscopic phenomena.

The invention discloses an intelligent street lamp demand-based illumination control method. According to the method, an active PFC (power factor correction) technology is adopted for correcting power factors, the variable-frequency power control technology is utilized, two kinds of trimming output modes including a remote trimming mode and an independent trimming mode are used, the multi-period trimming output is adopted, and the street lamp demand-based illumination goal is reached. The method provided by the invention has the advantages that the power factor of a street lamp can reach higher than 0.97 under the condition that the electric network voltage fluctuation range is 120V to 264V, and in addition, the integral energy consumption is reduced by more than 50 percent. The requirements of low carbon and energy saving are met, the standard conforms to the relevant national provisions, and certain popularization values and wide application prospects are realized.

The invention relates to a vehicle steer-by-wire system based on a planetary roller screw pair. The system comprises a first mechanical movable connecting rod and a second mechanical movable connecting rod which are movably connected with the two sides of a base respectively, a propelling mechanism respectively connected with the two movable connecting rods, a main transmission mechanism connectedwith the propelling mechanism, and a guide mechanism connected with the main transmission mechanism. The guide mechanism is connected with the base, the main transmission mechanism is connected witha driving system, the propelling mechanism comprises a transverse pull rod and a planetary ball screw pair connected with the transverse pull rod, a planetary nut of the planetary ball screw pair is connected with the main transmission mechanism, and the propelling mechanism, the first mechanical movable connecting rod, the base, the second mechanical movable connecting rod, the main transmissionmechanism and the guide mechanism form a six-rod mechanism. Compared with like systems in the prior art, the system of the invention has the following advantages: the reliability is high, and the controllability, accuracy and comfort of the vehicle steering system are improved.

The invention discloses a friction type mechanical continuously variable transmission. A left end cover is arranged at the left end of a box body; a right end cover is arranged at the right end of thebox body; a driving shaft is arranged in the box body; a left driving cone pulley and a right driving cone pulley are arranged on the outer side of the circumference of the driving shaft; a steel ring is arranged between the left driving cone pulley and the right driving cone pulley; an adjusting sleeve meshed with the gear is arranged on the outer side of the left driving cone pulley in the boxbody and connected with a pull rod; a driven shaft is arranged in the box body; a left driven cone pulley and a right driven cone pulley are arranged on the outer side of the circumference of the driven shaft; and a steel ring is arranged between the left driven cone pulley and the right driven cone pulley. According to the friction type mechanical continuously variable transmission provided by the invention, power of the driving shaft is transmitted to the left driven cone pulley and the right driven cone pulley through friction forces between the steel ring and the left driving cone pulley as well as between the steel ring and the right driving cone pulley, the friction forces between the steel ring and the left driving cone pulley as well as between the steel ring and the right drivingcone pulley are transmitted to the driven shaft, so that constant-power output can be achieved. The friction type mechanical continuously variable transmission has the advantages that the transmissionefficiency is high, the service life is long, the noise is low, and the vibration is small.

The invention discloses a phase inverter circuit used for lightening backlight of a liquid crystal display and a driving method thereof. A shooting display, a bus, setting devices, a central controller, a driver monitor, and door side displays are provided. The front door and the rear door of the bus are respectively provided with the setting devices and the door side displays, and electron tubes are additionally disposed on the central controller and the driver monitor, and then the central controller is used to transmit the received information after being processed to the door side displays and the driver monitor. A driver can notify passengers of getting off by the shooting display or controlling the moving of the bus, and each of the setting devices is provided with at least more than two buttons. A luminescent electron tube and an inductor are disposed in each of the buttons. The central controller is provided with a device used for integrating a number and a station into one body, and then is used to transmit the number and the station to the door side displays and the driver monitor. The door side displays are provided with liquid crystal displays, and the driver monitor is provided with a digital device, and therefore a device used for communication between the passengers and the driver is provided. A structure is simple, use is convenient and practical, and cost is low.

The present invention relates to digital/analog signal superposition feedback circuit, and is applied to circuit of high strength gas discharge lamp electronic ballast, which comprises the following components: voltage sampling circuit, current sampling circuit, digital/analog conversion circuit, superposition follower circuit and microprocessor. The invention comprises the following steps: sampling circuit transmits signal of lamp voltage and current to microprocessor by multiply for calculating power; digital power signal output by microprocessor is converted into corresponding analog signal and transmitted to superposition follower circuit B; meanwhile sampled current signal gets into superposition follower circuit A; superposition follower circuit A and B output digital/analog superposition feedback signal together. Analog signal and digital signal of current and power of characterization lamp can be compensated mutually and output superposing, and characteristic demand of lamp starting and constant power output of after stable can be realized.

The invention discloses a multifunctional ballast, which comprises a video display. A bus is composed of setters, a central controller, a driver monitor and door side displays, wherein the front door and the rear door of the bus are provided with the setters and the door side displays respectively; electron tubes are added to the central controller and the driver monitor, the central controller processes the received information and transmits the information to the door side displays and the driver monitor, and the driver informs a passenger to get off the bus or controls the vehicle to move through the video display; the setter is provided with at least two buttons, and the button is internally provided with a light emitting electron tube and a sensor; the central controller is provided with a device which integrates numbers and stops, and the numbers and the stops are transmitted to the door side displays and the driver monitor; the door side display is provided with a liquid crystal display screen; and the driver monitor is provided with a number device. A device for enabling the passenger and the driver to communicate exists. The structure is simple, convenient and practical, and the cost is low.

The invention discloses a fluorescent lamp with a short circuit protection circuit; a camera display and a bus are included; the fluorescent lamp is formed by setters, a central controller, a driver monitor, and door side displays; the front door and back door of the bus are respectively provided with the setter and the door side display; the central controller and the driver monitor are added with an electron tube; the central controller processes received information, sends the information to the door side displays and the driver monitor, and the driver uses the camera display to inform passengers to get off or control vehicle motions; the setter is provided with at least more than two buttons; a luminescence electron tube and an inductor are arranged in the button; the central controller is provided with a device combining digits with stations; the information can be sent to the door side displays and diver monitor; the door side display is provided with an LCD; the driver monitor is provided with a digit device, so passengers and the driver can communicate through the device. The fluorescent lamp is simple in structure, easy to use, and low in cost.

The invention discloses a prompting system for arrival of a bus at a bus stop. The system is composed of a camera display device, a bus, setting devices, a central controller, a driver monitoring device, and door display devices. The setting devices and the door display devices are arranged at a front door and a rear door of a bus; electronic tubes are arranged at the central controller and the driver monitoring device; and thus the central controller processes received information and transmits the processed information to the door display devices and the driver monitoring device, and a driver informs passengers of getting off the bus or controlling the bus by the camera display device. At least more than two buttons are arranged at the setting devices; and light-emitting tubes and sensors are arranged inside the buttons. A device with digital number and stop integration is arranged at the central controller; the information is transmitted to the door display device and the driver monitoring device. Liquid crystal display screens are arranged at the door display devices and a digital device is arranged at the driver monitoring device, so that passengers and drivers can carry out communication. The system has advantages of simple structure, great convenient and practical effects, and low cost.

The invention relates to a controllable integrated magnetic gear box for a high-power wind driven generator, which belongs to the field of wind power. The controllable integrated magnetic gear box comprises a first-stage controllable integrated coaxial magnetic gear, a second-stage coaxial magnetic gear, a third-stage coaxial magnetic gear and the like. The first-stage controllable integrated coaxial magnetic gear comprises a first driving shaft, a first driven shaft, a first outer rotor magnetic gear, a first inner rotor magnetic gear and a magnetic adjusting stator; the magnetic adjusting stator comprises a magnetic adjusting iron core block and an armature winding; each of the second-stage coaxial magnetic gear and the third-stage coaxial magnetic gear comprises a driving shaft, a driven shaft, an outer rotor magnetic gear, an inner rotor magnetic gear and a magnetism adjusting ring; the first driving shaft is connected with the wind wheel main shaft; the first driven shaft is connected with a driving shaft of the second-stage coaxial magnetic gear; the driven shaft of the second stage is connected with the driving shaft of the third stage; and the driven shaft of the third stage is fixed with the rotating shaft of the generator. The device is free of lubrication, light in weight, low in operation and maintenance cost, large and controllable in transmission torque and capable of assisting in controlling the rotating speed of a generator and prolonging the service life of a unit.

The invention discloses an inverter circuit for lightening the backlight of an LCD. The inverter circuit comprises a camera display. A bus is formed by a setter, a central controller, a driver monitor and a door edge display. The setter and the door edge display are respectively arranged on the front door and the rear door of the bus. Electric tubes are added on the central controller and the driver monitor, so that the central controller processes the received information and transmits to the door edge display and the driver monitor. A driver notifies passengers to get off the bus or control the movement of the vehicle through the camera display. At least two buttons are arranged on the setter, and lighting electric tubes and sensors are built in the buttons. Number and station setting integrated device is arranged on the central controller, and transmitted to the door edge display and the driver monitor. The door edge display is provided with a liquid display screen, and a digital device is arranged on the driver monitor to serve as a communication device between passengers and the driver. The inverter circuit is simply structured, convenient and practical and is low in cost.

The invention belongs to the technical field of power supplies, and provides an LED drive circuit and an LED power supply. The LED drive circuit is connected with an LED module and comprises a first sampling module, a second sampling module, a reference voltage generation module, a feedback module, a control module and a voltage conversion module. The first sampling module is used for generating voltage sampling signals according to the driving power supply; the second sampling module is used for generating a current sampling signal according to the driving power supply; the reference voltagegeneration module is used for generating a first reference voltage according to the voltage sampling signal; the feedback module is used for generating a feedback signal according to the first reference voltage and the current sampling signal; the control module is used for generating a control signal according to the feedback signal; and the voltage conversion module is used for converting an input voltage into a driving power supply according to the control signal so as to drive the LED module.