108results about How to "Realize multiple protection" patented technology

The invention discloses an SO file protection method and device and an android installation package reinforcement method and system. The SO file protection method includes the steps of writing a to-be-protected SO file in a shell procedure file as code data, and protecting the SO file in the shell procedure. According to the technical scheme, by adding a shell to the SO file and protecting the SO file, the multiple protection is achieved for the SO file, an important code of an android installation package is further stored in the SO file, the reinforcement protection is achieved for the android installation package with the protected SO file as a protection object, malicious programs can be effectively prevented from conducting disassembling analysis on the SO file, the security level of the content of the SO file is improved, and the safety level of the android installation package is improved.

The invention provides an anti-lost method, a server and terminal equipment. The anti-lost method is applied to the server. The server is communicated with the terminal equipment. The terminal equipment includes main equipment and auxiliary equipment. The main equipment is wirelessly communicated with the auxiliary equipment. The anti-lost method includes the steps: when an alarm signal of the main equipment is obtained, acquiring the characteristic information of a second user of the auxiliary equipment; acquiring the position when the main equipment alarms; according to the current position, determining the target monitoring area; by means of a camera device which is communicated with the server, acquiring the image information in the target monitoring area; and according to the image information in the target monitoring area and the characteristic information of the second user, searching the second user and determining the positional information of the second user. The anti-lost method can realize multiple protection of a person under guardianship in the monitoring area, can effectively prevent loss of the person under guardianship, and can improve the safety.

The invention discloses a burglary-preventing device and a burglary-preventing method of a finished electric vehicle and a storage battery and belongs to the technical field of burglary prevention. The burglary-preventing device mainly comprises a sensing unit, a data processing unit, an alarm unit and a wireless transmission unit, wherein the sensing unit comprises a human body infrared sensor, a vibration sensor, an accelerated speed sensor, a GPS (Global Positioning System) module, a micro-switch, a normally close relay and the like; the data processing unit consists of a single chip computer and a peripheral circuit thereof; the alarm unit consists of an alarm device and a driving circuit thereof; the wireless transmission unit consists of the GPRS (General Packet Radio Service) module and a processing circuit thereof. The burglary-preventing device performs corresponding burglary-preventing feedback according to a signal of the sensing unit and sends related information to a mobile phone of a vehicle owner. The monitoring information of the device is plentiful, the defects of single function, easy attack and the like of the current burglary-preventing system are overcome, the reliability of burglary prevention is improved, and the burglary-preventing device and the burglary-preventing method can be used for tracing the electric vehicle after early alarm, burglary prevention and burglary when the electric vehicle is parked.

The invention discloses a solar light chasing device. The solar light chasing device comprises a supporting base and a solar panel fixing frame, wherein the solar light chasing device also comprises an azimuth adjustment device and an elevation angle adjustment device; the azimuth adjustment device is supported on the supporting base; the elevation angle adjustment device is supported on an output shaft of the azimuth adjustment device through a bracket; an output end of the elevation angle adjustment device is hinged to the solar panel fixing frame to drive a solar panel to realize elevation angle swinging; an encoder used for detecting angle change is arranged on an output shaft of the azimuth adjustment device; an encoder for detecting the angle change is arranged on a rotating shaft of the solar panel fixing frame or a hinge shaft which is hinged to the azimuth adjustment device. According to the solar light chasing device, an elevation angle drive device and an azimuth drive device are arranged, so that the position of the solar panel can be adjusted according to an incidence angle of solar rays; therefore, solar energy can be fully absorbed, the absorption rate is improved, and the application of solar heat is improved.

The invention discloses an airtight powder screening system and method for a metal 3D printer. The airtight powder screening system for the metal 3D printer comprises a feeding mechanism, a vibratingpowder screening mechanism, a powder collecting mechanism and a control module, wherein the feeding mechanism, the vibrating powder screening mechanism, the powder collecting mechanism and the controlmodule are sequentially arranged from top to bottom. The feeding mechanism is used for conveying the metal powder to the vibrating powder screening mechanism. The vibrating powder screening mechanismis used for conducting vibrating screening on metal powder. The powder collecting mechanism is used for collecting and storing the metal powder obtained after vibrating screening. The feeding mechanism, the vibrating powder screening mechanism and the powder collecting mechanism are connected in an airtight manner, so that the feeding process, the vibrating powder screening process and the collection and storage process of the metal powder are conducted on a sealed path isolated with the atmosphere. By the adoption of the airtight powder screening system and method for the metal 3D printer, the metal powder screening stability is greatly improved, the powder screening speed is greatly improved, the powder is effectively prevented from being polluted, and the service lives of a screening net and other components are prolonged.

The invention relates to a safety industrial control system based on a safety intelligent controller. The system is composed of a PLC controller, an input and output module and an upper computer. ThePLC controller is the core of the whole system. An independently researched and developed industrial chip is adopted, and a security firewall and a security encryption system are arranged in the industrial chip. Safety protection is realized on an infected main body. An input and output module and an upper computer are matched to form a set of pure industrial control system with safety protection.A safety protection system is arranged in each link of the upper computer, the PLC and the input and output module, multiple protection is achieved, major accidents such as misoperation can be avoided even if one link is attacked, the other two links can be comprehensively verified and judged, fault processing is carried out, and safety measures are immediately taken to prevent accident expansion.

The invention provides a leaching device for processing heavy metal in house refuse and sludge by using citric acid, comprising a pedestal (4), a leacheate collecting tank (7), and a frame (8), wherein the periphery of the frame is provided with straight form support rotating rods (3), the axial two end portions of the straight form support rotating rods support a transmission chain, a crawler type filter screen conveyer belt (2) is fixed on the chain, a stainless steel sludge reserve tank (1) is fixed above the crawler type filter screen conveyer belt, an atomization spray system (6) is arranged above the stainless steel sludge reserve tank, and a set of filter screen cleaning devices (13) are arranged below the crawler type filter screen conveyer belt and above the leacheate collecting tank. The leaching device disclosed herein can continuously work, has large handling capacity, convenient maintenance, and low maintenance cost. The leaching device adopts bilayer rollers to drive and has no damage to the crawler type filter screen conveyer belt, thus multi-protection is realized, and the service life of the crawler type filter screen conveyer belt is prolonged.

The invention discloses a method for achieving the multiple protection of a bearer network, and the method comprises the steps: enabling SDH and PTN to be supported by an OTN (optical transmission network) in a unified manner; building different routing optical cables in all core interoffices of an OTN core layer; calculating the shortest path from a source end to a target end, and enabling the shortest path to serve as a protection path. The invention also discloses the bearer network achieving the multiple protection, and the bearer network comprises the SDH, the PTN, and the OTN. The SDH and the PTN are supporting by the OTN in a unified manner through a wave channel. The OTN comprises the core layer and a convergence layer, wherein the core interoffices of the core layer are provided with different routing optical cables. The OTN also comprises calculating equipment which is used for calculating the shortest path from the source end to the target end, and the shortest path serves as the protection path.

The invention discloses a collet used for a splice, comprising a cylindrical body provided with an optical fiber line hole, one end of the cylindrical body is provided with at least two locking heads divided by a lock groove, while the other end is provided with at least one spatula, the upper end face of the body of the spatula is an arch surface which can be extended by pressure, and the arch surface is higher than the external surface of the cylindrical body. Compared with the prior art, the collet has at least one spatula arranged on the front end of the cylindrical body, the upper end face of the body of the spatula is the arch surface which can be extended by the pressure, and the arch surface is higher than the external surface of the cylindrical body. When installed, an optical fiber line passes through the optical fiber line hole; an ejector sleeve of an optical-fiber junction group is pushed, when the ejector sleeve is pushed to the position of the spatula, the back arch surface of the spatula is pressed down; as the spatula head of the spatula is closely attached to the surface of the optical fiber line, and the arch surface of the body of the spatula is pressed to extend, so that the optical fiber line is pushed forward automatically, thereby guaranteeing the joint of fiber surfaces is powerful and reliable.

The invention discloses a novel shock absorption self-resetting energy-consuming inhaul cable supporting device, and belongs to the technical field of shock absorption equipment. The novel shock absorption self-resetting energy-consuming inhaul cable supporting device is composed of a resetting mechanism, resetting energy-consuming mechanisms, force-limiting energy-consuming mechanisms, high-strength steel cables and bases. The resetting mechanism is arranged between the two bases, and the resetting energy-consuming mechanisms are arranged on both sides of the resetting mechanism. The force-limiting energy-consuming mechanisms are arranged on the outer sides of the resetting energy-consuming mechanisms in a connecting mode, and the high-strength steel cables are arranged on the outer sidesof the force-limiting energy-consuming mechanisms in a connecting mode. According to the novel shock absorption self-resetting energy-consuming inhaul cable supporting device, the self-resetting ability of the supporting is improved, the selection range of a pre-stressed reset bar material is widened, the increase of the supporting internal force under the action of exceeding the fortification intensity earthquake is effectively suppressed, the energy-consuming ability is improved, so that main structural elements, such as beams and columns, are strengthened, the insufficiency that an existing reset reinforcement material-fiber reinforced composite material can not bend at a pulley position is overcome, the utilization ratio of the self-reset mechanism is improved, and the economic cost is reduced.

The invention relates to a system and method for realizing multiple protection and expansion functions for a three-dimensional passive optical access network. The system is that an optical link terminal OLT is connected to a remote node RN through two single mode fibers; the RN is connected to N optical network units ONUs, and the N ONUs are mutually connected into a three-dimensional structure, wherein the OLT mainly comprises N optimal transmitters, two arrayed waveguide gratings AWGs, one three-port optical circulator, one first erbium doped fiber amplifier, one optical detector and N optical receivers; and the RN comprises 7 AWGs, one 1x7 optical power divider, a second erbium doped fiber amplifier, N optical couplers and N three-port optical circulators. The system for realizing the multiple protection and expansion functions for the three-dimensional passive optical access network provided by the invention firstly realizes the extensible application of a three-dimensional structure in a WDM-PON by adopting an optical passive array which is formed by the AWGs and the optical couplers in the RN; and realizes the multiple protection of distributed optical fibers and wavelength reuse of the ONUs by using connecting optical fibers between optical switches and adjacent ONUs, so that the system achieves a balance between cost and performance.

The invention discloses a high-altitude work safety protection device, and belongs to the technical field of electric power network tower operation safety protection equipment. The device comprises two shoulder straps, a waistband and leg straps, wherein the shoulder straps and the leg straps are connected with the waistband correspondingly, and the shoulder straps are connected through a back protecting part which is in contact with the back of an operator and through a chest protecting part which is in contact with the chest of the operator; the high-altitude work safety protection device further comprises an anti-falling rope, an instant self-locking device and a first protection rope, wherein the anti-falling rope, the instant self-locking device and the first protection rope are usedfor fixing the top of the anti-falling rope, the top of the instant self-locking device and the top of the first protection rope on the top end of tower, the back protecting part is connected with theinstant self-locking device through the first protection rope, and the instant self-locking device is connected with the anti-falling rope; and the chest protecting part is provided with a second protection rope which a first lock catch is arranged at the end part, and the first lock catch is connected with the chest protecting part in a hanging mode; and a plurality of third protecting ropes used for being connected with the tower in a hanging mode are connected to the waistband. According to the device, the technical problems of single protection measure and poor safety of the protection device in the prior art can be solved, the technical effects of a plurality of protection measures to perform protecting and more safety can be realized.

The invention provides an analog-digital hybrid multiphase interleaving parallel power converter, wherein a peak current control chip and a conventional boost converter form a voltage source module, and current ripples of input and output are reduced remarkably through a multiphase interleaving parallel structure. Each module is uniformly controlled by a digital control chip DSP, analog and digital parts are connected through a differential circuit and common-mode noise is eliminated. Analog-digital hybrid control is used in the analog-digital hybrid multiphase interleaving parallel power converter, digitalization enables the converter to have the capability of realizing complex control algorithms, moreover, real-time communication can be realized, the number of the modules can be changeddynamically, and multiple protection is realized; and the analog peak current has high detection prevision, fast response and strong capacity of resisting disturbance. Additionally, modular power supply design is used, and structure of the modular power supply design is highly integrated. Relatively, under the condition of same working conditions, the analog-digital hybrid multiphase interleavingparallel power converter is obviously superior to the other pure analog systems or pure digital systems in the aspect of working performance.

The invention relates to an LED driving circuit. A protective circuit comprises an audion Q2. A collector of the audion Q2 is connected with a grid electrode of a field effect transistor Q1. A base electrode of the audion Q2 is connected with a source electrode of the field effect transistor Q1. An emission electrode of the audion Q2 is connected with the ground. The protective circuit comprises a resistor R12, a capacitor C12 and a thyristor VT. An anode of the thyristor VT is connected with a driving output end of a driving chip U1. A cathode of the thyristor VT is connected with the ground. A gate electrode of the thyristor VT is connected with one end of the resistor R12 and one end of the capacitor C12. The other end of the resistor R12 is connected with the ground. The other end of the capacitor C12 is connected with the source electrode of the field effect transistor Q1. After the field effect transistor Q1 is subjected to breakdown, the audion Q2 is subjected to saturation quickly, shorting circuit the ground of the collector of the audion Q2 is carried out, the driving chip U1 is protected, the upper end of a current limiting resistor R15 generates high voltages, and meanwhile the high voltages are added to the gate electrode of the thyristor VT through the capacitor C12, so that the gate electrode is connected, anode voltages of the thyristor VT are lowered to 0V, so that the driving chip U1 is protected, the driving chip U1 is effectively protected, and multiple protection is achieved.

The invention relates to the technical field of aerospace engineering ground test equipment, in particular to a three-dimensional motion gravity compensation system for a space manipulator. The system comprises a compensated mechanical arm, a follow-up mechanism, a support and a hanging spring suspension system, the compensated mechanical arm is arranged at the bottom of the support, and the follow-up mechanism is arranged at the top of the support and connected with the compensated mechanical arm through the hanging spring suspension system; the compensated mechanical arm and the follow-up mechanism are the same in structure, and three-dimensional motion gravity compensation of the compensated mechanical arm is achieved by synchronously controlling motion of the compensated mechanical arm and the follow-up mechanism. Multi-axis and three-dimensional motion gravity compensation is carried out on the compensated mechanical arm, and the purpose of simulating the space microgravity working state on the ground is achieved.

The invention discloses a front bumper assembly, and belongs to the field of automobile bumpers. When an automobile collides with a foreign object, an anti-collision plate positioned on the outer sideis firstly impacted, and a compression spring between a mounting base and the anti-collision plate plays a first buffering role, so that the direct impact of the anti-collision plate on the mountingbase is reduced; meanwhile, a connecting rod can move towards the direction of the mounting base under the action of the anti-collision plate, buffer oil filled in a transition chamber is extruded into a connecting pipe and a buffer cavity through a sealing piston, the purpose of further buffering is achieved through compression of the buffer oil and a compression air bag, and the second bufferingeffect is achieved; and a bumper can be used for carrying out multiple protection on an automobile, meanwhile, a driver can conveniently observe the fatigue accumulation condition of the bumper, fatigue accumulation of the bumper which is not provided with obvious scratches on the surface but is impacted for multiple times can be found in time, and risks are reduced.

The invention relates to the technical field of power distribution cabinets, and particularly discloses a high-voltage power distribution cabinet with multiple protection effects. The high-voltage power distribution cabinet comprises a cabinet body and a door plate, and is characterized in that the door plate is rotatably connected to the front side of the cabinet body, a heat dissipation fan is mounted at one side, close to the interior of the cabinet body, of the door plate, and a heat dissipation window is formed at the rear side of the cabinet body; an opening and closing mechanism is arranged at the rear side of the cabinet body and located on the heat dissipation window, a conical cover plate is fixed to the upper portion of the cabinet body through a second supporting column, and acover sealing mechanism is arranged at the upper end of the cabinet body; an installation plate is fixed to the inner side of the conical cover plate, a fire extinguishing mechanism is arranged between the installation plate and the interior of the cabinet body, and a power mounting rack is arranged in the cabinet body. Through the mutual cooperation of the heat dissipation fan, the cover sealingmechanism, the opening and closing mechanism, the fire extinguishing mechanism, the conical cover plate, the shock absorber and the heat dissipation window, the rapid heat dissipation, rapid fire extinguishing and shock absorption in the cabinet body are realized, and multiple protection of power device in the power distribution cabinet is realized.

The invention discloses an intelligent GSM (Global System for Mobile Communications) multimedia message alarm which comprises an alarm host and a remote controller. The intelligent GSM multimedia message alarm is characterized by also comprising a wireless detector, wherein the alarm host comprises a wireless receiving module, a GSM module, a control module, a camera, an SD (Secure Digital) memory card, a power module and a human body sensing probe; both the wireless detector and the remote controller comprise wireless transmitting modules, and the wireless transmitting modules are connected with the wireless receiving module in a wireless network transmission mode; and the wireless receiving module is connected with the control module via the GSM module, the control module is respectively connected with the human body sensing probe and the camera, the camera is connected with the SD memory card, and the power module supplies power to each module device. In the invention, the wireless detector, video monitoring and wireless communication are perfectly combined, camera shooting, memory, monitoring, sensing and alarming are integrated, moving targets are actively monitored, the situation of the site is informed to the owner as soon as possible, and the occurrence and expansion of loss are stopped in time.

The invention provides an anti-freezing method and a floor heating system. The anti-freezing method is applied to the floor heating system. The floor heating system comprises a floor heating device, awater storage pipeline, a water return pipeline and a water storage tank, wherein one end of the water storage pipeline and one end of the water return pipeline are connected with the water storage tank, and the other ends of the water storage pipeline and water return pipeline are connected with the floor heating device. The anti-freezing method comprises steps as follows: when a preset water storage anti-freezing condition is met, the floor heating device is controlled to shut down; the water storage pipeline is controlled to input water in the floor heating device into the water storage tank for storage; when a preset startup heating condition is met, the water return pipeline is controlled to input water stored in the water storage tank into the floor heating device; and the floor heating device is controlled to be stared. The anti-freezing method has the characteristics of saving resources, reducing energy consumption and being high in degree of automation.

The invention discloses a protective device for medical test tube transportation. The protective device for medical test tube transportation comprises a protective frame, a protective cover plate, a shock-absorbing protective assembly, a test tube placing frame and a test tube placing protective assembly, wherein a transverse protective assembly is arranged between the test tube placing frame andthe inner wall of the side surface of the protective frame, the transverse protective assembly comprises an L-shaped protective plate, a tension spring is connected between the end part of the L-shaped protective plate and the inner wall of a blind groove, a sliding block matched with a sliding groove is fixedly arranged on the side wall of the L-shaped protective plate, and a second tension spring is connected between the side wall of the L-shaped protective plate and the side wall of the test tube placing frame. The protective device for medical test tube transportation is provided with theL-shaped protective plate, under the action of the tension spring and the second tension spring, the test tube placing frame achieves the purpose of transverse buffering and shock absorption while vertical shock absorption is formed by the shock-absorbing protective assembly, multiple protection on medical test tubes is achieved under the combined action of the test tube placing protective assembly, and the probability of damage to the medical test tubes in the transportation process is further reduced.

The embodiment of the invention provides a motor protection method and device for an electric power steering system, and the method comprises: multiplying a target auxiliary steering torque by a torque gain coefficient, and obtaining a corrected target auxiliary steering torque, wherein the calculation process of the torque gain coefficient comprises the following steps: detecting that the hand torque of a driver for operating a steering wheel is greater than a preset first torque value; and after a period of time, gradually reducing the corrected target auxiliary steering torque by graduallyreducing the torque gain coefficient, so that the current of the motor is not kept at a relatively large value for a long time no matter whether the current is blocked by a hard object or the steeringwheel reaches a tail end area, and the burnout risk of the motor is reduced. Furthermore, a protection method based on a steering wheel angle signal is combined with a protection method based on manual torque, multiple protection of the motor is achieved, and the risk that the motor is burnt out when the steering wheel reaches the tail end area is reduced.

The invention discloses a sealed biological gene detection saliva retention box. The sealed biological gene detection saliva retention box comprises a retention box body, a foam holding frame, reagentbottles, a condenser and two fans, wherein the condenser is arranged at the center of the bottom of the retention box body; two fans are fixed at two sides of the condenser at the bottom of the retention box body; a heat conduction supporting plate is arranged on the inner side wall at the bottom of the retention box body; an bottom end of the heat conduction supporting plate is in contact with an output end of the condenser; the foam holding frame is arranged at the center of the top end of the heat conduction supporting plate; placing groove are formed in the foam containing frame at intervals; the reagent bottle is arranged in each placing groove; a sealing cover is arranged at the top of the retention box body; an elastic contact plate is fixed at the center of the bottom end of the sealing cover; and a single chip microcomputer is inlaid on the outer side wall of the retention box body. According to the sealed biological gene detection saliva retention box, the damage to saliva samples is avoided, the retention environment of the saliva samples is improved, and the effective life of the saliva retention box is prolonged.

The invention relates to a safe and quick escape bed. When earthquake, tornado, and the other disasters with destructive effects on buildings happen, the escape bed uses deadweight as a power resource of an escape device and integrates the functions of alarm, escape and a multilayer protection into a whole and is especially suitable for buildings below two floors in towns, villages and cities. The safe and quick escape bed comprises a bed frame, a trigger starting device, a gravity drop linkage device, a first layer steel plate protecting device, a second layer telescopic door protecting device; the escape bed is similar to the common domestic wooden single or double bed in appearance; a bed board goes down to the downmost ground of the bed frame within 3-5 seconds after an escape program starts, the first layer steel plate protecting device is tiled on the bed frame, and the second layer telescopic door protecting device is spread and tiled in the middle of the bed frame. The safe and quick escape bed is beneficial for stable safety when a human body goes down and is protected (especially for old people) and achieves quickest multilayer protection effect.

The invention provides an image protection method and device, and an image restoring method and device. The image protection method comprises steps of acquiring a watermark image and a to-be-protectedcolor image; embedding the watermark image into the to-be-protected color image so as to obtain an embedded image; and encrypting the embedded image to obtain an encrypted embedded image. According to the invention, by embedding the watermark image into the to-be-protected color image, through the watermark image, protection is performed on the to-be-protected color image; after the embedding, the embedded image is encrypted for two times, wherein pixel distribution is disrupted once and pixel values are corrected once; multiple times of protection is performed on the to-be-protected color image; after the pixel values are corrected, an attacker fails to directly obtain any information of the to-be-protected color image from the encrypted embedded image; the process of restoring the to-be-protected color image from the encrypted embedded image is complex and the breaking difficulty is big; and in the image restoring process, user identity identification is performed through the watermark image, and after the identification passes, the to-be-protected color image is restored, so the safety of the to-be-protected color image is greatly improved.

The invention relates to a face recognition lock intelligent control system, which comprises a PLC (programmable logic control) control system, a touch screen, a power supply, a user management unit, a machine setting unit, a registering information unit, an equipment information unit, a registering face, a registering card, a registering password, a user browsing part, a user registering part, a management registering part, a face registering part, a card registering part, an equipment name, a sequential number, an algorithm version, a firmware version, a voice selection part, a sound volume selection part, an unlocking time delay part, a confirming mode, a time setting mode, an all user setting deletion part and a factory setting recovery part. The face recognition lock intelligent control system has multifunction, realizes the intelligent authentification, and can realize the unlocking control by using various confirming modes. The various confirming modes include any one kind of mode of the face, the intelligent card and the password, or can be the single mode of the face, the intelligent card and the password, or one kind of mode of the face and intelligent card combination, the password and face combination, and the card and password combination; the multiplex protection is realized; the antitheft safety is high; the anti-theft effect is good; the intelligent control degree is high.

The invention discloses a camellia soothing and moisturizing sleeping mask and a preparation method thereof. The mask provided by the invention is non-irritant to skin, stable in property, safe to useand free of toxic and side effects. The mask provided by the invention is scientifically prepared according to a formula, and has good permeability to skin; and moisture in the mask permeates into cuticle of skin epidermis, so that the skin becomes soft, the elasticity is increased, and efficient repair of sensitive skin can be realized. According to the camellia soothing and moisturizing sleeping mask disclosed by the invention, exopolysaccharides, vitamins, palmitoyl tripeptide-8 and multiple plant extracts are compounded as active ingredients according to a certain ratio to achieve a synergistic effect, so that the anti-allergic activity of the skin can be effectively improved, the activity of hyaluronidase is inhibited, multiple protection on the sensitive skin can be realized, and the effects of resisting allergy and irritation on the skin after the skin is dried in the sun are achieved. The camellia soothing and moisturizing sleeping mask has the effects of continuously calmingand cooling, and effectively relieves symptoms such as skin stabbing pain and burning sensation.

The present invention provides a projection equipment, which comprises a power detecting part used for detecting the power circuit of the projection equipment and producing a state signal of the power circuit to describe whether the state signal of the power circuit is in the normal state or not, a lens cap detecting part used for detecting the opening and closing state of the lens cap and producing a state signal of the lens cap which is used for describing whether the lens cap is in the opening state or not, and a control part which is connected with the power detecting part and the lens cap detecting part respectively to receive and judge the power state signal and the lens cap state signal in order to control the power of the projection equipment. The present invention can realize automatic detection of lens cap opening and closing and preventing damage to the projection equipment caused by the failure of opening the lens cap when the projector is power on.

This invention discloses a drive control and protection circuit for a resonant switch including a maximum frequency limit circuit of repeated pulses, a dead zonetime control time control circuit, a Pmax time control circuit, a logic combination control circuit, a double frequency division driving circuit, in which, when a switch frequency is smaller than 1 / 2 resonance frequency, the resonance current works discontinuously, which relies on the over-zero signal of a serial resonant current to realize the shut-off of zero current and zero voltage of a switch tube.

The invention discloses an encapsulating method of a high-strength chip, which mainly comprises the following steps: a) mounting and connecting a base plate, b) mounting and connecting a chip, c) detecting the performance, d) pouring a sealing layer, e) plating a metal layer, f) spraying and coating a heat dissipation layer, and g) detecting a finished product. The invention has the beneficial effects that with the adoption of the encapsulating method of the high-strength chip, the working procedures are reasonable to arrange and are easy to implement; an encapsulating body outside the chip is prepared by a plurality of working procedures in the encapsulating process to form a multi-layered encapsulating structure, thereby realizing the multiple protection to the chip and effectively improving the strength and the toughness of the encapsulating structure; and meanwhile, the good heat radiation performance of the encapsulating structure is also ensured, so that the service performance of the chip is more excellent.