155results about How to "No need to debug" patented technology

The invention discloses a device and a method for measuring square wave modulated photoelectric volume pulse wave. A microprocessor outputs square waves which have different frequencies and form a double ratio relationship; the square waves drive at least two light-emitting diodes; the light from the light-emitting diodes are received by a photosensitive device after passing through tested finger; the photosensitive device converts the light into a voltage signal; the voltage signal is converted into a predefined amplitude value voltage signal by a current / voltage conversion amplifier; an analogue-to-digital converter converts the predefined amplitude value voltage signal into a digital signal; the microprocessor processes the digital signal to obtain photoelectric volume pulse wave and valley value and peak value thereof, and gets spectrum value by the valley value and the peak value. The measurement method comprises the following steps of: separating the digital signal to obtain the photoelectric volume pulse wave and removing interference of background light by the microprocessor; getting the valley value and the peak value according to the photoelectric volume pulse wave; and calculating the valley value and the peak value to obtain light absorbance difference, and obtaining the spectrum value by the light absorbance difference. The accurate measurement, simple circuit and low cost are realized.

The invention relates to an intelligent control device for an LED street lamp and an intelligent control method. The intelligent control device comprises a moving image sensor component, a microprocessor and a street lamp switch control interface, wherein the moving image sensor component is used for detecting whether a moving object is on a pavement, and transmitting detection information to the microprocessor; the microprocessor is used for generating control instruction for indicating a preset time span of lightening the LED street lamp according to the detection information, and transmitting the control instruction to the street lamp switch control interface; and the street lamp switch control interface is used for lightening the LED street lamp in the preset time span according to the control instruction. The intelligent control device also comprises a communication component used for transmitting and receiving information, the moving image sensor component is also used for detecting the moving direction of the moving object, and the microprocessor is also used for generating state message according to the moving direction so as to previously lighten the LED street lamp in the moving direction. The device and the method can control the switch of the LED street lamp according to the pavement condition so as to increase the service life of the LED street lamp and save energy.

The invention discloses an efficient wireless meter reading method for an automatic network router. The router comprises a concentrator serving as a primary node and a collector serving as a secondary node. Firstly, one communication network can have only one primary node, and each primary node may have 255 secondary nodes; in the same wireless network, each node has an unique communication address of which value ranges from 0 to 255; the primary node ID is 0, while the secondary node ID ranges from 1 to 255; secondly, wireless data transmission modules arranged on the primary node and the secondary node are provided with a plurality of optional channels, a communication channel is required to be adjusted under both two conditions; and thirdly, the primary node acquires all communicable secondary nodes by an automatic route method, and acquires relay paths to all secondary node so as to realize the wireless meter reading. The invention can improve the application performance of a meter reading system and fulfill the aims of convenient construction, free debugging and less maintenance.

The invention discloses a sine-wave modulation photo plethysmo graphy measuring device and method. A microprocessor is used for outputting sine waves which are at different frequencies and are in a twifold rate relation; the sine waves are used for driving at least four light-emitting diodes; light emitted by the light-emitting diodes is received by a light-sensitive device after passing through a tested finger; the light-sensitive device is used for converting the received light into a voltage signal; the voltage signal is converted into a preset amplitude voltage signal by using a current / voltage conversion amplifier; an analog to digital converter is used for converting the preset amplitude voltage signal into a digital signal; the microprocessor is used for processing the digital signal to obtain photo plethysmo graphy and a valley value and a peak value of the photo plethysmo graphy; and a spectrum value is obtained according to the valley value and the peak value. The method comprises the following steps of: performing phase locking computation and separation processing on the digital signal to obtain photo plethysmo graphy and eliminating the interference of background light by using the microprocessor; acquiring the valley value and the peak value according to the photo plethysmo graphy; and computing the valley value and the peak value to obtain an absorbency difference value and obtaining a spectrum value according to the absorbency difference value. A circuit is simple, and the digital signal is concise.

The invention provides a single-antenna frequency-modulated continuous-wave radar radio frequency passive cancellation method, and aims to provide a passive cancellation method for realizing high transceiving isolation through transmit leakage cancellation and feed line reflected signal cancellation. The method comprises the following steps of: arranging a passive cancellation network connected with a transceiving front-end circuit and a transmission line reflected signal canceller having a wave guide structure between a radar antenna and a transceiving front end, performing power division ontransmitting signals of the transceiving front end to form two paths through a transmitting T-shaped head of the passive cancellation network, allowing one path of signals to pass through a waveguidebridge and a 90-degree waveguide phase shifter and the other path of signals to pass through a 180-degree waveguide phase shifter and a waveguide bridge, synthesizing by using the T-shaped head at anoutput end, allowing the signals to pass through the transmission line reflected signal canceller, and outputting the signals to the radar antenna at the maximum power and to a receiving port at the minimum power. The passive cancellation network and the transmission line reflected signal canceller are arranged between the radar antenna and the transceiving front end, and problems that a reflected power passive cancellation system is complicated, large in volume and heavy in weight, and circuits are difficult to design and debug are solved.

The invention discloses a wireless passive measuring method and a circuit. The circuit comprises a wireless passive sensor part and an external controller part, wherein the wireless passive sensor part consists of a capacitor and a coil; and either the capacitor or the coil is a sensor and can work without a power supply. The invention has the characteristics of simplicity, small volume, light weight and the like, and is particularly suitable for measuring occasions where long-term detection is needed and a connecting line is absent.

The invention discloses a blood oxygen saturation measuring device and a measuring method. The measuring device is characterized in that a microprocessor outputs square waves at different frequencies and in twice rate relationship, the square waves drive at least two kinds of light emitting diodes, light emitted by the light emitting diodes is received by a photosensor after passing through a finger to be measured, the light is converted into voltage signals by the photosensor, the voltage signals are converted into preset amplitude voltage signals through a current / voltage conversation amplifier, an analog to digital converter converts the preset amplitude voltage signals into digital signals, the microprocessor processes the digital signals, and the blood oxygen saturation is obtained. The measuring method comprises the steps that: the microprocessor carries out separation processing on the digital signals, photoelectric volume pulse waves are obtained, and the background light interference is eliminated; a valley value and a peak value are obtained according to the photoelectric volume pulse waves; the valley value and the peak value are calculated to obtain a Q value; and the blood oxygen saturation is calculated through the Q value, and the blood oxygen saturation is obtained. Square wave frequency division modulation and digital demodulation are adopted, and the blood oxygen saturation measuring device and the measuring method have the characteristics that the measurement is accurate, the circuit is simple, and the cost is low.

The invention discloses a device and method for measuring orthogonal sine wave photoelectric volume pulse wave. A microprocessor is used for outputting orthogonal sine waves of different frequencies; the orthogonal sine waves are used for driving at least four light-emitting diodes; light emitted by the light-emitting diodes is received by a photo-sensing device after passing through a tested finger; the photo-sensing device is used for converting the received light into a voltage signal; the voltage signal is converted into a preset amplitude voltage signal by using a current / voltage conversion amplifier; an analog-to-digital converter is used for converting the preset amplitude voltage signal into a digital signal; and the microprocessor is used for processing the digital signal to obtain orthogonal sine wave photoelectric volume pulse wave and a valley value and a peak value thereof and obtain a spectral value through the valley value and the peak value. The method comprises the following steps of: performing phase locking computation and separate processing on the digital signal by using the microprocessor to obtain photoelectric volume pulse wave and eliminate disturbance of background light; acquiring a valley value and a peak value according to the photoelectric volume pulse wave; and computing the valley value and the peak value to obtain an absorbency difference valueand acquiring a spectral value through the absorbency difference value. The device and the method have the characteristics of accurate measurement and simple circuit.

The invention provides a portable grain analyzer that is based on digital image processing technology. The analyzer comprises a mechanic-electric feeding system, a digital imaging system, and an image processing and data analysis system. The grains entered into the mechanic-electric feeding system will be imaged by the digital imaging system, then the imaged signals are transmitted to the image processing and data analysis system. The mechanic-electric feeding system and the digital imaging system operate under control by a computer through an image collecting and a system controlling circuit board. The mechanic-electric feeding system has a funnel, under which, a distributing plate connected with a vibrator is provided; below the distributing plate, a rotary platform for receiving grains is provided; on the rotary platform, a scraping piece is provided; under the rotary platform, a collector is provided; above the rotary platform, the digital imaging system is provided. The analyzer can automatically feed samples, is of small size, easy to operate, of high efficiency and low cost, and will not damage the sample. The invention is applicable for classification, identification, true and false verification, and quality inspection of rice and similar grains and beans.

The invention relates to an automatic measuring device for a diameter of a bearing ring and belongs to the technical field of a measuring device for a shaft sleeve ring. The automatic measuring device comprises a base plate and further comprises a fixed measuring base, a moveable measuring slide base, a measuring mechanism and a measuring pen which are arranged on the base plate, wherein the moveable measuring slide base is in sliding fit with a slide rail arranged on the base plate; a moveable measuring block is arranged on the moveable measuring slide base; a moveable measuring head is arranged on the moveable measuring block; a pair of independent fixed measuring blocks is arranged on the fixed measuring base; and a fixed measuring head is arranged on the fixed measuring blocks. The automatic measuring device for the diameter of the bearing ring is low in manufacturing demand on the measuring blocks, is simply mounted, is free from debugging and has a generality within a certain scope.

The invention provides an elevator operating state detection system and method. The elevator operating state detection system comprises a three-axis acceleration sensor, an atmospheric pressure sensor, an acceleration computing module, a speed computing module, a height computing module and a judging module. The three-axis acceleration sensor is used for measuring operating acceleration of an elevator. The atmospheric pressure sensor is used for measuring the atmospheric pressure in the operating process of the elevator. The acceleration computing module is used for computing acceleration of the elevator in the operating direction based on data of the three-axis acceleration sensor. The speed computing module is used for computing the speed within a fixed time frame based on the acceleration obtained through the acceleration computing module. The height computing module is used for working out the current altitude based on the current atmospheric pressure measured by the atmospheric pressure sensor. The judging module is used for judging the operating state of the elevator according to the operating speed, the acceleration and the time of duration of the elevator. By the adoption of the elevator operating state detection system and method, the parameters are self-adaptive, and debugging is not needed for users; and the non-intrusive detection manner is independent of an elevator control system, operation of the elevator is not interfered, and safety is enhanced.

Disclosed is an epoxy resin cast dry type transformer, which comprises a low-voltage winding, two high-voltage windings, an iron core, an upper heel piece, a lower heel piece, an upper clamp, and a lower clamp. The low-voltage winding is arranged at the inner layer of the loop and the high-voltage windings are arranged at the outer layer of the loop. The low-voltage winding is made of clutch gold and is provided with an insulating interlayer which is presoaked with DMD resin. The initial loops of the high-voltage windings are located at one end of the whole loop, and the starting end of the first coil of each layer of the high-voltage windings is connected with the finishing end of the last coil of the next layer. The number of the coils of the windings descends from the inner layer to the outer layer, making the windings developing into antiparallelogram structures; a soft gridding cloth layer is arranged between each two adjacent layers; the whole medium is epoxy resin and solvent-free gridding material is arranged between the outer layers of the windings at both ends of the whole loop. The epoxy resin cast dry type transformer is reasonable in design, novel in design, large in power, and small in size, and is convenient to install and easy to maintain. The epoxy resin cast dry type transformer is safe, stable and reliable and is long in service life and low in using cost and requires no daily maintenance. The epoxy resin cast dry type transformer is of strong practicability and is applicable in power supplying departments and power consuming departments.

The invention relates to a correction method of a linear pressure sensor. The correction method comprises the steps that 1) when non input or low input pressure is acquired, the actual output voltage of the pressure sensor is used as a low pressure correction parameter; 2) when high input pressure is acquired, the actual output voltage of the pressure sensor is used as a high pressure correction parameter; 3) according to the low pressure correction parameter and the high pressure correction parameter, an input and output equation after correction is acquired; and 4) the output voltage value of the pressure sensor is read, and the actual input pressure value is corrected according to the input and output equation after correction. Compared with the prior art, the correction method provided by the invention has the advantages that dynamic error correction is respectively carried out on each pressure sensor, thus the final sampling value is accurate and is close to the real value.

The invention discloses a waveguide filter, and relates to the field of electromagnetic field and microwave technologies. The waveguide filter comprises a first waveguide flange plate, a second waveguide flange plate, a first waveguide, a second waveguide and four hemispherical resonators, wherein the cavity wall of each hemispherical resonator is provided with a through rectangular groove which is used for suppressing a high-order resonance mode of electromagnetic waves in the hemispherical resonator so as to expand the spurious-free stopband bandwidth of the waveguide filter. The invention further discloses a manufacturing method of the waveguide filter. The structure of the waveguide filter is integrally printed by a selective laser sintering 3-D printer through adopting a metal powdermaterial, does not need assembly and debugging while achieving accurate processing and effectively improves the manufacturing efficiency.

The invention provides a device for sleeving a bearing ring. The device comprises a frame, a feeding mechanism, a ring sleeving mechanism and a discharging mechanism, wherein an outer ring storage plate and an inner ring storage plate are arranged on the frame; the outer ring storage plate and the inner ring storage plate are connected with each controllable motor respectively; the outer ring storage plate and the inner ring storage plate are horizontally arranged; the inner ring storage plate is arranged under the outer ring storage plate; storage holes are formed on the outer ring storage plate and the inner ring storage plate, are uniformly distributed along peripheries, and comprise accommodation chambers and brackets; an outer ring storage hole is necessarily formed on the outer ring storage plate and is overlapped with an inner ring storage hole which is formed on the inner ring storage plate up and down to form a ring sleeving channel; a through hole which allows an inner ring to pass through is formed on the bottom of the outer ring storage hole; a ring sleeving cylinder is positioned under the ring sleeving channel; a push rod of the ring sleeving cylinder is fixedly connected with a push block which can push a ring in the ring sleeving channel upwards till the ring leaves the outer ring storage plate, wherein the length of the push block is greater than the diameter of the storage holes; and a through groove which can allows the push block to pass through is formed on a side wall of the storage holes. The device for sleeving the bearing rings has the advantages of simple structure, quick model replacement, wide application range, rare occurrence of machine fault, and low cost.

The invention discloses an image playing system for playing 3D movies by a single projector, and relates to a movie playing system, in particular to a 3D movie playing system. The system comprises a 3D polarizer, a polarization lens, projection equipment, a data processor and polarized glasses; the data processor alternately transmits left and right screen images to the projection equipment in fixed frequency, and the projection equipment acquires two images which are continuously changed and crossed and are not overlapped; a servo unit in the 3D polarizer drives the polarization lens to rotate so that left and right switching frequencies of the polarization lens are synchronous with the switching frequency of the two images, the polarization lens rotating synchronously totally separates the left and right screen images by adopting the optical polarization technology, and the separated left and right images are continuously and alternately projected on the metal screen; and the polarized glasses are worn by spectators to watch the 3D effect image. The system has the advantages of no need of expressive films, wide film source, simple manufacture, low cost, convenient installation, simple operation, no need of debugging, convenient movement, no limitation of use places and the like.

The invention relates to an astronautic programmable thermocouple temperature transmitter. A circuit part is composed of a power circuit, a programmable amplifying circuit, a programmable cold junction compensation circuit, an operation amplifying circuit and an output protecting circuit, wherein the functions of power filtering, reverse connection protection, transient impact protection, and the like, are achieved by the power circuit; a thermocouple signal is adjusted to be in a suitable voltage range by the programmable amplifying circuit; the programmable cold junction compensation circuit is used for sensing the temperature of a cold junction of the thermocouple, converting a temperature signal of the cold junction into a voltage signal and compensating the temperature of the cold junction of the thermocouple; output signals of the programmable amplifying circuit and the programmable cold junction compensation circuit are operated and amplified to be 0-5V by the operation amplifying circuit; and the output protecting circuit is used for limiting an output voltage within a scope of -0.5V to +6.5V and protecting a next-stage system from being damaged when the circuit is in fault. The astronautic programmable thermocouple temperature transmitter has the advantages of high intelligent degree, adjustable range, no requirement for hardware debugging, suitability for batch production and suitability for thermocouples of K type, E type, T type and tungsten rhenium type.

The invention relates to an LLC (inductor-inductor-capacitance) resonant DC-DC (Direct Current-Direct Current) power supply capable of changing resonance frequency by changing capacitance. The LLC resonant DC-DC power supply comprises an input circuit, an electronic switch, an LLC resonant circuit, a high-frequency transformer circuit and an output circuit; the LLC resonant circuit comprises a first inductance coil, a first capacitor and a second inductance coil, as well as a voltage / current sensor circuit and a programmable single chip computer; the voltage / current sensor circuit comprises a voltage sensor and a current sensor; the LLC resonant circuit also comprises a second VMOS (Vertical Metal Oxide Semiconductor) tube and a second capacitor; and the second VMOS tube and the second capacitor are serially connected and then connected on two ends of the first capacitor in parallel. Through the invention, the technical problem of incapability of the adjustment of resonance frequency according to the change of a load of the power supply in the traditional power supply for a vehicle is solved. Through the invention, the system is provided with two resonance points, then the power supply can work under different resonance frequencies in different loads and the frequency of the system during the adjustment deviates a little from the resonance points, so that the work efficiency of the DC-DC power supply is improved.

The invention relates to a control power supply for a subway safety door system, which comprises a parallel operation module, and a first power supply control module and a second power supply control module which are connected between the parallel operation module and an input power supply and are connected to a subway safety door through a first unidirectional conducting device and a second unidirectional conducting device in the parallel operation module respectively, wherein the first power supply control module and the first unidirectional conducting device form a first power supply; the second power supply control module and the second unidirectional conducting device form a second power supply; and the first power supply and the second power supply work in a master-master mode for supplying power to the subway safety door together or a master-slave mode for supplying power to the subway safety door through one power supply. When the conventional control power supply for the subway safety door fails, the safety door cannot be opened automatically or manually so as to cause large negative effect. By implementing the control power supply, when one power supply is damaged, the normal use of the other power supply cannot be affected, so the power supply reliability of the system is improved; and the control power supply has the advantages of low equipment invest, short development period and no need of adjustment.

The invention relates to a capacitive grounding current distributed compensation method for a medium-voltage power supply system, which belongs to the technical field of the capacitive grounding current compensation of a neutral non-grounding power supply system. In the method, capacitive grounding current distributed compensation transformers are arranged on lines, with relatively greater capacitive grounding currents, of the system in a distributed way, and only compensate the capacitive grounding currents of the corresponding lines, wherein the compensation capacity of each capacitive grounding current distributed compensation transformer is 1.1 times the capacitive grounding currents of the corresponding lines; and 40 to 60 percent of the capacitive grounding currents of the system is compensated by the capacitive grounding current distributed compensation of the whole power grid, and the other is comprehensively compensated by arc extinguishing devices of transformer substations. The capacitive grounding current distributed compensation method has the advantages that: the capacitive grounding current distributed compensation transformers are adopted, so arrangement is simple and maintenance is unnecessary; operation is simple and the capacitive grounding current is compensated in real time; and the power supply reliability of the power grid is radically improved.

A multi-channel semiconductor laser aging method, the semiconductor laser diodes LD are installed one by one on the multi-channel LD test and aging fixture, and the fixture is connected with a multi-channel constant power control circuit equipped with a power supply and connected with a central analysis and control computer; The computer first tests the constant power resistor that matches a certain LD on the fixture, and then connects the power control circuit unit that matches the LD in the multi-channel constant power control circuit, so that the LD is in the same or similar condition as the actual working condition. Aging is carried out in an environment, and then the remaining LDs to be tested are subjected to the aforementioned steps one by one. Most of the equipment used in the present invention is the transformation of existing equipment, which makes the circuit of the equipment simpler, more reliable, and more convenient to operate. It can be aged only by connecting the power supply; the aging efficiency is high, and the aging result is more accurate and practical; It is free of debugging and works with constant power, so that the LD will not be damaged.

The invention discloses a miniaturization micromechanical filter. The filter is manufactured based on micromechanical process and formed by overlying upper and lower layers of medium materials, an interdigitated metal electrode layer is arranged on the lower surface of the upper medium layer, ground connection bonding welding rings are arranged on the upper surface of the lower medium layer, cavities prepared by etching process are formed among the welding rings, through holes are arranged on the upper and lower medium layers, metal layers are arranged on the inner walls of the through holes, surface electrode layers are arranged on the surfaces of the upper and lower medium layers, and input and output lead wires are arranged on the surface of the upper medium layer. The filter can meet index requirements of high operating frequency, large bandwidth, small loss and the like of a microwave filter and has the advantages of being small in size, fully sealed and high in reliability.

The invention discloses a control method for an intelligent socket. The method comprises the following steps of: A, after the socket is electrified, loading a load on a main control circuit to a normal work state in pre-set time; B, collecting a simulated current signal on the main control circuit at regular time; C, calculating an average value of the collected simulated current signal; D, taking the percentage of the average value, which is less than the average value of the simulated current signal, as a standard current signal, and storing the standard current signal; E, collecting a real-time current signal on the main control circuit and comparing the real-time current signal with the standard current signal; and F, if the real-time current signal is less than the standard current signal, switching off a power supply of a controlled circuit; otherwise, maintaining the power supply of the controlled circuit. The invention further discloses a control circuit which is matched with the control method and is used for the intelligent socket. The intelligent socket manufactured by the invention has the beneficial effects of convenience for use, free debugging of the circuit, high automation degree and energy saving.

The invention discloses an LED fluorescent lighting device, which consists of a plurality of exchangeable LED modules arranged on a fluorescent stimulation switching device and a fixed common condenser; the LED module is switched between the work area and non-work area by the fluorescent stimulation switching device; the LED module consists of an LED and a color filtering block; while the LED module is positioned on the work station, LED is turned on in the work area of the common condenser, which shines the light to enter into the color filtering block after being converged on the condenser, then to be reflected by light splitting separation film in the color filtering block, finally to be illuminated on the section to stimulate the section to shine the fluorescent light, so that the LED modules with other wavelengths are delivered into the work area of the common condenser in order to realize the switch of the different stimulation wavelengths. The LED fluorescent lighting device realizes time division work of a plurality of LED modules, and reduces the cost of the system while guaranteeing the flexibility of the system.

In the remotely-controlled intelligent security and protection device provided in the invention, a mobile object detecting technology is integrated with a short message and multimedia message service platform of a communication operator; during detection and alarm, the short message platform is used to timely and rapidly send information to a user and a third party security company, and simultaneously detected pictures are snapshotted and the detected pictures are sent through the multimedia message service platform. The intelligent security and protection device is a security and protection product, can provide a wide and enforceable value added service for the communication operator and can provide binding with a third party security service mechanism. A security service tool is provided for the third party security service. A price of the intelligent security and protection device is low. The device can perform real-time monitoring and remote control. Covertness is strong and an application scope is wide. Man-machine conversation can be realized. It is easy for data storage and reading. The device can be widely used in daily production and lives and a new direction for the communication service is opened up.

The invention relates to a thing-thing intelligent interactive device and a thing-thing intelligent interactive method and an interactive system thereof. The interactive device comprises a control part, a storage part and a communication part, wherein the control part is used for processing and controlling the interactive device in real time; the storage part is connected with the control part and is used for storing attribute coding data; and the communication part is connected with the control part and is used for communicating the interactive device and other interactive devices through a preset interactive protocol and the attribute coding data so as to complete the sending and receiving of interactive data. In the invention, the thing-thing intelligent interactive system and the thing-thing intelligent interactive method are realized, the automatic discovery and intelligent interaction between the things are effectively realized and the device, method and system have important meanings for the development of the internet of things.

The invention relates to a self-adjustable manually-driven drum brake. The problems that in an existing manually-driven drum brake, a brake gap cannot be automatically adjusted, and a friction plate needs to be frequently replaced are mainly solved. The self-adjustable manually-driven drum brake is characterized in that the other ends of two brake shoe plates (2) are provided with racks (5) which vertically correspond to each other respectively, a brake shoe actuating device (3) comprises a gear (31), a gear shaft (32) and a swing arm (7), the gear shaft (32) is installed on a brake base plate (1) in a penetrating mode, an automatic gap adjusting device (8) is connected between the two brake shoe plates (2) and comprises a casing pipe (81) and a ratchet bar (82), and the two brake shoe plates (2) are each provided with a brake gap limiting hole (84). According to the drum brake, automatic compensation of the brake gap is achieved on the manually-driven drum brake, the service life is prolonged, the repairing and maintaining cost is reduced, and the advantages of being free of adjustment and easy to assemble are achieved.

The invention provides a built-in transformer of a wind power tower barrel, comprising a low-voltage winding, a high-voltage winding and an iron core. The structural key points are as follows: the iron core is provided with an upper iron yoke and a lower iron yoke; a side column is respectively arranged between the left end and the right end of the upper iron yoke and the lower iron yoke; the upper and lower ends of the side column are respectively connected with the left end and the right end of the iron yoke in an overlapping manner; the middle part of the iron yoke is provided with a middle column; the upper end and the lower end of the middle column are respectively connected with the middle part of the iron yoke in an overlapping manner; the side column and the middle column are respectively provided with the winding; the inner layer of the winding is provided with low-voltage coil; the outer layer of the low-voltage coil is sheathed with a high-voltage coil; clamping units are respectively arranged at the front and rear sides of the iron yoke; the low-voltage coil is wound with a copper foil; the materials pre-impregnated by DMD resin is used as the insulation between layers; a flexible grid cloth is arranged between two adjacent layers of the high-voltage winding; and the periphery of the high-voltage is provided with the solventless grid materials. The invention is characterized by compact structure, long service life, low noise, free maintenance, high reliability, no pollution, flame retardancy and the like, the probability of partial discharge is approximately zero, and the invention can be recycled after the service life is ended up.

The invention provides a positive projection integrated machine and a reflective screen. The positive projection integrated machine comprises a casing, a reflective screen which is arranged outside the casing and is fixed on the casing, and an optical engine which is fixed on the casing. The positive projection integrated machine has the advantages of compact structure and simple assembly, and the installation and debugging are not needed in use. The reflective screen comprises a substrate and a diffuse reflection layer which covers a surface at one side of the substrate, the reflective screen can carry out diffuse reflection on light, and thus the angle of view is increased.