264results about How to "Increase the opening speed" patented technology

The invention relates to the technical field of circuit breakers, and discloses an opening-closing operation control device. The opening-closing operation control device comprises a shell, a motor, a driving gear, a handle gear, a handle turntable and a release lever; a pressure block on the end face of the driving gear can be matched with one end of the release lever, the handle turntable is used for setting a handle inner shaft, a handle connecting rod of the handle turntable is positioned in an accommodating groove of the handle gear, the motor rotates in one direction, the handle gear drives the handle turntable to rotate to realize automatic closing, the motor rotates reversely to drive the handle gear to return to the initial position, and the handle turntable can rotate freely in the accommodating groove to realize manual opening and closing; the motor further rotates reversely, and the pressure block can drive one end of the release lever, and a release linkage shaft drives a release linkage mechanism inside a circuit breaker to release so as to realize automatic opening and keep the opening state. The circuit breaker can realize the functions of automatic opening and closing, manual opening and closing after automatic closing, failure in manual closing after automatic opening and the like, and is simple in structure, good in opening and closing synchronization and quick in opening.

The invention provides a system and a method for tracking a moving target based on a wireless sensor network. The system comprises a sink node, a gateway, a server and a plurality of sensor node devices; and the tracking method comprises the following steps: evenly arranging the sensor node devices in a target monitoring area; starting the sensor node devices and server software, and making preparation for receiving data of the wireless sensor network; when a passive infrared sensor detects a target, starting ultrasonic ranging and operating Extended Kalman Filtering Algorithm to obtain a target position coordinate; adopting a principle of a minimum covariance matrix track to select a task node of the next time; and reading initial data from the sink node through the gateway, drawing a data curve and a target track, saving the data, and transmitting a server instruction to a node of a specified ID through the gateway by the server. The system and the method can accurately detect and report the position of the moving target in a monitoring area, adopt an effective sensor awakening mechanism and greatly save energy consumption of the nodes.

The invention discloses a method for realizing the looped network and its service, wherein, said looped network comprises a plurality of nodes in same logical layer for accessing the service into looped network or receiving service from the looped network; each two nearby nodes are connected via two reverse visual channels which is used to carry the adapting service data; and a physical chain circuit for carrying the service data adapted to said visual channel. The realizing method based on said looped network comprises: constructing a LSP dispatching table on every node; attaining service father node on the service source node according to the service LSP dispatching table; dispatching the service to the looped network according to the preset dispatching algorism; reusing the services of different nodes via the LSP method into one visual channel to be transmitted; and dispatching the service out the looped network on the service father node. The invention can supply the telecommunication on the network and improve the bandwidth utilization.

The invention relates to the field of digital marketing, in particular to a digital middle-platform system, a construction method and an application method, and the middle-platform system comprises aglobal member module, a full-contact marketing module, a full-channel transaction module, a full-link service module, a business middle-platform module, a data middle-platform module and a technical platform module. A full-link digital marketing function can be realized through the global member module, the full-contact marketing module, the full-channel transaction module and the full-link service module; and the business middle-platform module and the data middle-platform module provide support for realization of the full-link digital marketing function. And the technical platform module provides construction support and management for each module of the digital middle-platform system. The digital middle-platform system adopts a core design concept of agility, decoupling sharing and highreusability based on a large middle-platform and a small front end, realizes a full-link digital marketing business closed loop, leads enterprise digital innovation, and is high in integrity and goodin planarity.

The invention discloses a three-fracture double-acting type high-speed permanent magnet repulsion switch and a method of the three-fracture double-acting type high-speed permanent magnet repulsion switch and belongs to the field of direct-current switches. The three-fracture double-acting type high-speed permanent magnet repulsion switch comprises a switch body, high-speed electromagnetic repulsion mechanisms, permanent magnetic operating mechanisms, contact springs, insulation pull rods, opening driving circuits, closing driving circuits, a detecting unit and a control unit. Each moving contact is connected to one end of one insulation pull rod through one contact spring, the other end of each insulation pull rod is connected with a driving rod, and each driving rod penetrates through a metal disc in one high-speed electromagnetic repulsion mechanism and is connected with a moving iron core; the control unit is respectively connected with a detecting circuit, the opening driving circuits and the closing driving circuits; each opening driving circuit is connected with an opening coil and each closing driving circuit is connected with a closing coil. According to the three-fracture double-acting type high-speed permanent magnet repulsion switch, a fracture with a large opening distance is formed at a short time and the opening speed of the switch is increased; meanwhile, according to the switch, the two moving contacts and two fixed contacts are in contact in sequence, so that when opening operation is conducted, the problems of movement dispersibility generated when multiple switches are independently driven and the like are solved.

The invention discloses a synchronous rectification controller and a synchronous rectification control method. The controller comprises a sampling module, a driving module and a control module, wherein the sampling module is used for sampling a source voltage and a drain voltage of a synchronous rectification metal-oxide-semiconductor (MOS) tube and acquiring a voltage difference value between thesource voltage and the drain voltage, the driving module is used for adjusting a grid voltage of the tube, and the control module is used for comparing the voltage difference value, a first thresholdvalue and a second threshold value, controlling the driving module to adjust the grid voltage of the tube to maximum output voltage when the voltage difference value is smaller than the first threshold value, controlling the driving module to adjust the grid voltage of the tube to change between 0 and the maximum output voltage when the voltage difference value is larger than the first thresholdvalue and smaller than the second threshold value so that the voltage difference value is adjusted to be equal to the first threshold value, and controlling the driving module to adjust the grid voltage of the tube to 0 when the voltage difference value is larger than the second threshold value. By the controller, the switch-on and switch-off speed of the synchronous rectification MOS tube can beincreased, so that the efficiency is obviously improved, and the loss is obviously reduced.

The invention discloses a driving circuit of a silicon-carbide semiconductor field-effect transistor. The driving circuit comprises a PWM control circuit, a driving signal amplifying circuit, an opening circuit, a turning-off circuit, a gate current-increasing circuit and a voltage change rate control circuit. With the gate current-increasing circuit, the driving current is increased during the opening process of the SiC MOSFET and the rising of the gate-source voltage of the SiC MOSFET is accelerated, so that the opening speed of the SiC MOSFET is increased. With the voltage change rate control circuit, the Miller capacitance between the SiC MOSFET drain and gate is enhanced and the SiC MOSFET drain-source voltage change rate is reduced, so that the current spike during opening of the SiCMOSFET is reduced. After the SiC MOSFET drain-source voltage does not change, a voltage control switch is turned off to avoid the SiC MOSFET false conduction caused by the crosstalk, so that the safeoperation of the SiC MOSFET is ensured.

The invention discloses a path establishment method and system for cross-domain service interconnection, and a controller. The method comprises the steps of: establishing a forwarding path of a second-layer forwarding device, wherein the start node of the forwarding path of the second-layer forwarding device is the second-layer forwarding device, and the destination node is a border node of a third-layer forwarding device; establishing a forwarding path of the third-layer forwarding device, wherein the forwarding path of the third-layer forwarding device characterizes a path between forwarding devices at the border on the third layer; splicing the forwarding path of the second-layer forwarding device and the forwarding path of the third-layer forwarding device to obtain a spliced forwarding path; and after receiving a BGP (Border Gateway Protocol) message, determining a corresponding routing table based on the BGP message and the spliced forwarding path, and sending the routing table to the third-layer forwarding device, so that at least two pieces of user equipment establish an interconnection path via the corresponding second-layer forwarding device and third-layer forwarding device.

The invention relates to the field of the video live, specifically, the invention relates to a studio video playing control method and device, and a server. The method comprises the following steps: the server receives terminal native information reported by a client; the server acquires a CDN node satisfying a preset strategy according to the terminal native information, and distributes a CDN node IP cache list for the corresponding client; the server receives an opening instruction on a target studio by the client, and issues the CDN node IP cache list and the connection of the target studioto the client, thereby enabling the client to pull data stream in the target studio according to a CDN node request corresponding to the CDN node IP cache list. By caching the CDN node IP cache listfor the client at the server side, the client can directly pull the data stream in the studio from the corresponding CDN node according to the CDN node IP when the client opens the target studio, thereby improving the opening speed and success rate of the studio and promoting the watching experience of the user.

The invention discloses a drive circuit capable of quickly switching off a depletion type switching element. The drive circuit mainly comprises a P-channel enhanced switching element, a N-channel enhanced switching element and resistors connected with the grids of the two switching elements, and moreover, the drain of the P-channel enhanced switching element is connected with the drain of the N-channel enhanced switching element. The two switching elements are alternately switched on under the control of pulse width modulated signals, and the voltage between the drain and the source of the N-channel enhanced switching element is reversely added between the grid and the source of the depletion type switching element to control the on-off of the depletion type switching element. The drive circuit is characterized in that the depletion type switching element can be quickly switched on or off. The invention not only solves the problem on how to drive the depletion type switching element used in the prior switching power supply or the prior switching power converter, but also solves the problem on how to quickly switch off the depletion type switching element.

The invention discloses a permanent magnet high-voltage vacuum circuit breaker, which comprises a shell, vacuum arc quenching mechanisms, an operating mechanism and a permanent magnet driving device, wherein each vacuum arc quenching mechanism comprises an insulating pull rod for driving a moving contact to make rectilinear motion, and the permanent magnet driving device comprises a body and a driving rod which makes rectilinear reciprocating motion; each insulating pull rod is vertically arranged, and the driving rod in the permanent magnet driving device is vertically arranged and makes rectilinear motion along the vertical direction, and the operating mechanism comprises a driving main shaft, a driving auxiliary shaft, a driving arm and a rocker arm component; the driving rod in the permanent magnet driving device drives the driving auxiliary shaft through the driving arm, and the driving auxiliary shaft drives the driving main shaft to rotate through the rocker arm component; an output rocker arm is fixed on the driving main shaft, and the driving main shaft directly drives the insulating pull rod to make rectilinear motion along the vertical direction through the output rocker arm so as drive the moving contact to carry out the opening and closing operation. The invention has the advantages of simplified structure, fewer parts and higher reliability.

The invention describes a bypass valve (1) that can be used as a divert air valve. Bypass valves (1) that work in the closed or opened position in a force-balanced or pressure-balanced manner are known. During the opening of the bypass valve (1), a lower pressure is produced in a gap (25) between a valve closing body (3) and a valve seat (20), which pressure destroys the force balance and thus loads a movable valve unit (2) in the closing direction. In order to prevent this, according to the invention pressure equalization openings (24) are embodied or arranged with respect to the gap (25) in such a way that a reduced pressure is introduced into the chambers (7, 8) in the interior of the valve, so that the closing-operative force is distinctly reduced. By these means, the opening times of such a bypass valve can be distinctly reduced.

The invention discloses a permanent magnet actuating mechanism for a high-voltage vacuum circuit breaker based on a principle of electromagnetic repulsion, and belongs to the field of high-voltage vacuum circuit breakers. The permanent magnet actuating mechanism comprises an electromagnetic driving mechanism, a permanent magnet holding mechanism, an opening-buffering spring, a guide rod and a non-magnetic frame, and is characterized in that the electromagnetic driving mechanism comprises an opening electromagnetic repulsion mechanism and a closing electromagnetic driving mechanism; the permanent magnet holding mechanism comprises an opening permanent magnet, a closing permanent magnet, a holding static iron core and a holding moving iron core; and a non-magnetic gasket is arranged between the permanent magnet holding mechanism and the opening-buffering spring. The permanent magnet mechanism is enabled to realize high-speed opening at an initial period of an opening operation by using a characteristic of high-speed driving of the electromagnetic repulsion mechanism and energy stored by the spring in the closing process, and the opening-buffering spring plays a role of buffering at the final stage of the opening process, so that the instantaneous separating speed of the permanent magnet actuating mechanism is greatly improved on the one hand, and the loss, which is caused by excessively high speed at the final stage of opening, of the mechanism and the circuit breaker is restricted on the other hand.

The invention provides a display panel and a display device, and relates to the technical field of display. The display substrate comprises a switch transistor and a drive transistor. The switch transistor and the drive transistor comprise active layers which comprise a first active layer in the switch transistor and a second active layer in the drive transistor gate insulating layers which are disposed on the active layers and comprise a first gate insulating layer in the switch transistor and a second gate insulating layer in the drive transistor. The first gate insulating layer comprises afirst silicon nitride layer and a first silicon oxide layer. The second gate insulating layer just comprises a second silicon oxide layer, and the thickness of the second silicon oxide layer is greater than the thickness of the first silicon oxide layer; or the second gate insulating layer comprises a second silicon nitride layer and a second silicon oxide layer, wherein the thickness of the second silicon oxide layer is greater than the thickness of the first silicon oxide layer, and the thickness of the second silicon nitride layer is less than the thickness of the first silicon nitride layer. The display panel can meet the quick start demands of the switch transistor while achieving the better definition of gray scale.

The invention discloses a high-performance driving device used for a fuel injector electromagnetic valve. The driving device is composed of a storage battery power source, a DC / DC booster circuit, a digital signal processor, a PWM driver, power switch tubes and a current detection module. The storage battery power source is connected with the DC / DC booster circuit, the digital signal processor is connected with the PWM driver and the current detection module, the PWM driver is connected with the DC / DC booster circuit and the power switch tubes, and the power switch tubes are connected with the storage battery power source, the DC / DC booster circuit, the current detection module and the fuel injector electromagnetic valve. A high-end double-voltage time-sharing power supply technology and a low-end current feedback PWM control technology are adopted, in this way, the opening and closing speed of the electromagnetic valve is remarkably increased, energy consumption is greatly reduced, and fuel injection precision is improved.

The invention provides a method for breaking a high-voltage (HV) superconducting current-limiting direct current (DC) circuit breaker. The method comprises the following steps: when a HVDC side is in short-circuit fault and current / current rising steepness rises rapidly and reaches a critical value of a current limiter, a superconducting material quenches immediately, impedance rises steeply, short-circuit current is limited within set values, and meanwhile, an instruction is sent to an ultra-quick mechanical switch; the ultra-quick mechanical switch acts immediately, enables contacts to separate at an ultrahigh rigid separating speed so as to form a physical gap and generate electric arcs, and immediately sends a breaking instruction to a power electronic switch; the power electronic switch quickly breaks the short-circuit current and enables the electric arcs between the contacts to be extinguished, so as to form an isolated fracture; when the contacts are separated to final open positions and current in a lightning arrester is attenuated to zero, the HV superconducting current-limiting DC circuit breaker completes a whole breaking process, and a HVDC transmission power grid is isolated from a faulty line. The method has the advantages that the cost performances of different components are taken into account comprehensively, so that the cooperation is optimized; the number of components and devices is reduced as much as possible, so that the size is reduced, the weight is reduced, and the reliability is improved.

The invention provides a method for recognizing a fault in a power transmission line distance protection. The method comprises the following steps that the three-phase voltage and the three-phase current at the position where the protection is installed; a positive sequence voltage, a positive sequence current, a negative sequence current and a zero sequence current with the phi phase as the reference are determined; the current asymmetry degree at the position where the protection is installed is determined; the included angle between the positive sequence voltage and the positive sequence current is determined; fault recognition is carried out according to a current asymmetry degree plane. According to method for recognizing the fault in the power transmission line distance protection, fault recognition in the distance protection is achieved through comprehensive use of the current asymmetry degree and the U1cos phi1 characteristic, and action performance of an existing power transmission line distance protection is improved when a fault happens during oscillation and overload happens.

The invention provides a method for turning on / off an electro-mechanical integrated high-voltage direct-current circuit breaker. The method comprises the following steps: when a short circuit failure occurs at a high-voltage direct-current side and current and a current rise gradient reach corresponding on / off set values, a super-fast mechanical switch is immediately activated to separate contacts in a super-high instantaneous separating speed, a physical clearance is formed, electric arcs are produced, and an on / off command is instantly sent to a power electronic switch; short circuit current is quickly disconnected by the power electronic switch so as to quickly extinguish the electric arcs between the contacts of the super-fast mechanical switch and form an isolation fracture; when the contacts of the super-fast mechanical switch are separated to a final breaking position and the current in a lightning arrester is attenuated to zero, the circuit breaker finishes the whole on / off process, and a high-voltage direct-current power transmission power grid is isolated from the failure circuit. Optimal matching can be carried out in the comprehensive consideration of the cost-to-performance ratios of different elements. The elements can be reduced as far as possible, the size is reduced, the weight is reduced, and the reliability is improved. A novel means is created for the research and development of future high-voltage switch products.

The invention discloses a circuit breaker with the ability of quick reaction and separation and a quick reaction and separation method for a circuit breaker. The circuit breaker comprises a broken circuit contact group and a joint contact group; the broken circuit contact group comprises a movable broken circuit contact; the joint contact group comprises a movable joint contact; and a movable contact limiting device used for limiting position moving of the broken circuit contact and / or the joint contact is arranged between the broken circuit contact group and the joint contact group. The quick reaction and separation method for the circuit breaker comprises a broken circuit opening step: the broken circuit contact, earlier than the joint contact, reversely moves and is separated independently, or the broken contact and the joint contact reversely move and are separated at the same time. The broken contact is adopted for replacing a fixed contact in the traditional technology, in the case when the broken circuit needs opening and breaking, quick separation between the contacts is realized due to two-way separation action between the broken circuit contact and the joint contact, the electric arc phenomenon can be avoided or reduced, the service life of the circuit breaker is prolonged, and the method can be widely applied to various circuit breaker.

A contactor device of a repulsion-type circuit breaker includes a first movable contactor with a first movable contact to be driven by an open-close mechanism; a fixed contactor; a second movable contactor having second and third movable contacts; a first contact spring for urging the first movable contactor toward the second movable contactor; and a second contact spring for urging the second movable contactor toward the first movable contactor and the fixed contactor. The first movable contactor, fixed contactor, and second movable contactor are arranged such that when an over-current flows, an electromagnetic repulsive force is generated so that the first and second movable contactors are rotated against the first and second contact springs to open between the first movable contact and the second movable contact and between the fixed contact and the third movable contact before the open-close mechanism opens the first movable contact.

The invention relates to a digital broadcasting services system and a digital broadcasting services platform which are used for a user terminal of the system, and a digital broadcasting services activation method. A content scrambling module uses control word to make scrambling to the program content, and the digital broadcasting network broadcasts the program content which is scrambled; the digital broadcasting services platform encrypts the control word to produce entitlement management message which is sent to the user terminal by mobile communication network. The invention sends the entitlement management message by mobile network, thereby saving digital broadcasting bandwidth; each user can only receive the own entitlement management message, thereby increasing safety of the system and reducing the workload of terminals; the invention adopts a point to point way to send business activation authentication information, thereby greatly increasing business activation speed.

The invention relates to a processing method for raising the document opening speed of character processing, comprising: reading the data content of a document, reading the document-stored page typesetting information, obtaining paragraph and object information of pages, and loading the data contents of the pages according to the paragraph and object information. The invention creatively advances a technical solution of reading typesetting information of the document and routine data contents at the same time, and can obtain the typesetting content of each page of the document using the page as a unit through completely simple calculated typesetting, so as to make a user only spend a shorter time in seeing the contents and typesetting styles of the needed pages. The invention has a more obvious effect of raising the document opening speed with respect to a document with more contents and richer formatting information, for an example of a 1000-page document, the opening time of the invention is only 1% of that of the existing character processing software.

The invention discloses a unified traffic payment business implementation method and associated equipment and system. A CDN (Content Delivery Network) system comprising a unified payment business platform, a CDN scheduling system and at least one CDN service node is introduced; the unified payment business platform in the CDN system generates a unified payment business configuration strategy which is matched with each unified payment business and comprises address information of the CDN service node for providing the service for the corresponding unified payment business; and the CDN service node in the CDN system acts for a user terminal to initiate a business access request to the unified payment business platform, so that the effects of effectively reducing the performance pressure of a network element of a core network, improving the business service ability and supporting business scale development are realized on the basis of providing a new CDN-based unified traffic payment business implementation scheme.

The invention discloses a thyristor gate cathode structure and a gate pole commutation thyristor with the thyristor gate cathode structure. The thyristor comprises an N-substrate, a P base region, a P+ short base region, an N+ emitter region, a door pole metal electrode and a cathode metal electrode. The N+ emitter region, the P+ short base region, the P base region and the N-substrate are sequentially distributed, the cathode metal electrode is arranged on the outer surface of the N+ emitter region, and the door pole metal electrode is arranged on the outer surface of the P+ short base region. The thyristor gate cathode structure is of a two-layer step structure, wherein the first layer of steps is a shallow step, and the bottom of the first layer of the steps is a P+N+ boundary. The second layer of the steps is a deep step, and the bottom of the second layer of the steps is a PN+ boundary. The gate pole commutation thyristor with the thyristor gate cathode structure further comprises an N' buffer layer and a P+ anode region. The combination of electrons injected in the N+ emitter region of the thyristor is reduced at the P+ short base region and the P base region, conductivity modulation effects of the thyristor are intensified, and connected currents and the starting speed can be further improved.

The invention relates to a WiFi access point information cleaning method and a WiFi access point information cleaning device. The method comprises the steps of distributing respective priorities to all recorded WiFi access points; sorting the all WiFi access points according to the priorities; and cleaning information of the redundant WiFi access points according to a sorting result of the all WiFi access points. So that the stored information of the redundant or overdue WiFi access points is automatically cleaned by the system. Therefore, according to the access point information clean technology of the invention, the WiFi opening speed and linking speed of a user can be improved, the user experience can be optimized and the efficiency can be improved by cleaning the stored information of the redundant or overdue WiFi access points, and thus the user time is saved, and the user experience is improved.

The invention discloses a kvm virtual machine scheduling optimization method and system based on a memory disk and an SSD disk. The method includes: generating a base image, mounting an operating system, and configuring a system environment; judging whether free space of a / dev / shm directory in a tmpfs file system is larger than a preset value or not, if so, storing the base image under the / dev / shm directory, generating an increment image on the basis of the base image, and storing the increment image under the / dev / shm directory; or else, storing the base image into the SSD disk, generating an increment image on the basis of the base image, and storing the increment image into the SSD disk. The method and system has the advantages that the advantage of fast IO read-write of the memory disk is fully utilized in combination with the SSD disk, and kvm virtual machine scheduling is optimized.

The invention provides an electric pressure boosting energy storage cabin door actuating system. The electric pressure boosting energy storage cabin door actuating system comprises a pressure boosting energy storage device and a transmission device (2); the pressure boosting energy storage device comprises a one way pump-two way motor (3), a first one way valve (4), an energy accumulator (5), a switch valve (6), a servo valve (7), a second one way valve (8) and an oil tank (9); the one way pump-two way motor (3) can suck oil from the oil tank (9) through the second one way valve (8), and the energy accumulator (5) is filled with the oil through the first one way valve (4); the switch valve (6) is used for controlling an oil way between the energy accumulator (5) and the servo valve (7) to be connected or disconnected; the servo valve (7) is used for controlling the oil in the energy accumulator (5) to drive the one way pump-two way motor (3); and the one way pump-two way motor (3) is further used for driving the transmission device (2).

The invention discloses an opening speed improved superhigh-voltage silicon carbide thyristor which comprises an N+ type silicon carbide substrate, and a silicon carbide N buffer layer, a silicon carbide P+ buffer layer, a silicon carbide P long base region, a silicon carbide N- lowly doped region, a silicon carbide N highly doped region and a silicon carbide P+ emitter region in epitaxial growthon the upper surface of the N+ type silicon carbide substrate successively, the silicon carbide P+ emitter region is positioned on the silicon carbide N highly doped region, the surface of the siliconcarbide P+ emitter region is covered with an anode Ohmic electrode in a contact way, silicon carbide heavily doped N+ areas are embedded into the upper of the two ends of the silicon carbide N highlydoped region respectively, the surface of each silicon carbide heavily doped N+ area is covered with a gate Ohmic electrode, a gate-anode isolated region is formed between each gate Ohmic electrode and the silicon carbide P+ emitter region, and the backside of the N+ type silicon carbide substrate is covered with a cathode Ohmic electrode. The invention also discloses a preparation method of thethyristor. The opening speed of the thyristor is improved.

The invention discloses a rapid opening mechanism and a mixed AC breaker. The rapid opening mechanism comprises a permanent magnetic mechanism, vacuum arc-extinguishing chamber mechanisms, spring connection mechanisms and electromagnetic repulsion mechanisms; the permanent magnetic mechanism realizes opening and closing operations and provides opening and closing maintaining force; the vacuum arc-extinguishing chamber mechanisms are arranged under the permanent magnetic mechanism, comprise vacuum arc-extinguishing chambers, and are used to extinguish arcs and inhibit current rapidly after circuit break; the permanent magnetic mechanism is connected with the vacuum arc-extinguishing chambers via the spring connection mechanisms, and the spring connection mechanisms provide a contact pressure for a moving contact in a closing state; and the electromagnetic repulsion mechanisms provide a force enabling upward movement of the moving contact, and cooperate with the permanent magnetic mechanism to realize the opening operation and maintain an opening state. According to the mixed AC circuit breaker including the rapid opening mechanism and a forced commutation technology, the opening speed of the circuit breaker can be improved greatly, arc time is shortened, contact burning is reduced, and the electric service life of the contact is prolonged.