718 results about "Thyristor" patented technology

The invention relates to the technical field of power systems, and discloses a voltage regulation system of reactive power compensation equipment, which is characterized in that harmonic interference is filtered and eliminated through a voltage reactive power sensing unit, and accurate power grid parameters are acquired; a load trend pre-judgment unit analyzes the historical load curve and the real-time change trend to generate a future pre-judgment signal; the dynamic compensation calculation unit combines the current power grid state with the prediction to calculate the optimal compensation capacity and generate a switching instruction, after the hybrid switching actuator receives the instruction, a thyristor is triggered firstly to realize inrush current-free conduction, a contactor is switched to maintain low power consumption after the current is stable, and meanwhile, the compensation state monitoring unit performs closed-loop adjustment on parameter deviation, so that the optimal compensation capacity is obtained. The multi-dimensional protection unit prevents overvoltage, overcurrent and overheating, the double-path power supply guarantees continuous operation when the main power supply is abnormal, the intelligent communication unit realizes data uploading and remote cooperation, quick response switching of reactive compensation equipment and guarantee of safety of a large-scale power grid are realized, and inrush current impact in the switching process is effectively inhibited.

The invention discloses a high-voltage bidirectional silicon controlled rectifier electrostatic protection device and a manufacturing method. The high-voltage bidirectional silicon controlled rectifier electrostatic protection device comprises a P-type substrate, a P-type well and a high-voltage N well, the emitter P + injection of a parasitic PNP triode and the emitter N + injection of a parasitic NPN triode in the P-type well are arranged alternately, so that the length of a transverse discharge path of the silicon controlled rectifier is reduced to the greatest extent, the square resistance of a PNPN positive feedback conduction path is greatly reduced, and the key problem that a symmetrical bidirectional silicon controlled rectifier structure cannot be effectively opened in a high-voltage window of more than 70V is solved; in addition, the layout can provide an additional parasitic NPN triode path for a silicon controlled rectifier path, the effective area of an emitter of the parasitic NPN triode and the proportion of the emitter in a silicon controlled rectifier loop are increased, and the current discharge capacity of the device is further improved. Therefore, reference can be provided for the structural design of the high-voltage symmetrical bidirectional silicon controlled rectifier electrostatic protection device, and the silicon controlled rectifier can be effectively applied to ESD protection of a high-voltage bidirectional port.

An on-line program control excitation power supply with quench protection for a high-temperature superconducting magnet comprises a single-chip microcomputer for receiving control data, outputting control voltage through digital-to-analog conversion (DAC) of the single-chip microcomputer, and magnetizing a magnet coil through current stepping; a sampling signal is output to the liquid crystal screen to display corresponding voltage and current values in real time after being processed by the single-chip microcomputer analog-to-digital conversion ADC; voltage signals at the two ends of the magnet coil are sampled and returned to the single-chip microcomputer to be processed, when high voltage occurs, it is judged that the voltage signals are abnormal voltage signals, quench protection is carried out, the single-chip microcomputer outputs control signals to cut off connection between the magnet coil and the excitation power source, and residual energy of the magnet coil is released through the high-power thyristor. The provided excitation power supply has the characteristics of high power, high stability, good repeatability and good linearity; performing numerical control stepping output, gradually applying current to the superconducting coil, and slowly establishing a magnetic field; effective quench protection is achieved, and it is guaranteed that a magnet coil is not damaged by quench.

The invention relates to the technical field of output sharing control, in particular to a multi-path power regulator control method and system, and the method comprises the following steps: collecting real-time data to establish a data queue, calculating a mean value and a standard deviation to generate a dynamic operation baseline, collecting the real-time data to establish the queue, calculating the mean value and the standard deviation to generate a dynamic baseline, the method comprises the following steps: calculating an adaptive over-current and open-phase alarm threshold based on a baseline, adding an external control quantity to obtain a total power demand, adjusting the number of cycles according to the stability of a load, reducing the number of active whole waves in proportion when the number exceeds the limit, and stopping a thyristor triggering instruction when the current or voltage abnormally and continuously reaches a preset count. According to the method, the self-adaptive threshold is calculated by establishing the dynamic operation base line in combination with the fluctuation amplitude and the sensitivity factor, current and voltage abnormity is specifically recognized, the total cycle number and the active whole wave number are adjusted in combination with the external power requirement and the load stability, single trigger angle control dependence is avoided, and power distribution balance and electric energy supply stability are achieved; and the equipment damage risk is reduced.

A circuit device includes: a first terminal; a second terminal; a first thyristor circuit whose one end is coupled to the first terminal; a second thyristor circuit whose one end is coupled to the second terminal; and a voltage setting circuit that is shared by the first thyristor circuit and the second thyristor circuit and through which a current from the first thyristor circuit when the first thyristor circuit is turned on and a current from the second thyristor circuit when the second thyristor circuit is turned on flow. The voltage setting circuit sets a voltage at other end of the first thyristor circuit to a first voltage when the first thyristor circuit is turned on, and sets a voltage at other end of the second thyristor circuit to a second voltage when the second thyristor circuit is turned on.

The invention provides a direct-current circuit breaker and a control method thereof, and belongs to the technical field of direct-current middle-high voltage power system fault protection. The short circuit turn-off branch comprises a first capacitor and a first thyristor; the coupling commutation branch comprises a first inductor, a second inductor, a second thyristor and a third capacitor; the rated turn-off branch comprises a first resistor and a second capacitor; the first resistor, the second capacitor, the first capacitor and the second inductor are sequentially connected in series and then are connected with the main switch branch in parallel; the first inductor, the second thyristor and the third capacitor are sequentially connected in series, and the first inductor and the second inductor form mutual inductance. By controlling the on-off of the first thyristor, the first capacitor and the second capacitor are connected in series, the capacitance value is reduced, large-capacitance-value operation of a single group of capacitors is realized, and the problem that the on-off time of rated and lower low-current breaking is relatively long can be solved.

The invention discloses an impedance-adjustable series hybrid cascade static synchronous compensator and a control method thereof. The method comprises the following steps: acquiring grid-connected point voltage and load current information, and performing positive and negative sequence component analysis on the grid-connected point voltage and load current information; calculating a compensation line current component with the same size and opposite phase as the positive and negative sequence components of the load current so as to compensate the reactive power and the negative sequence current of the grid-connected point load; zero-sequence injection current used for in-phase active power balance is calculated, and reference operation current of each cascade branch is obtained; calculating the output reactive power of each phase based on the cascade branch voltage of each phase and the reference operation current, calculating the corresponding trigger angle of each phase thyristor under the condition that the adjustable impedance bears all phase voltages and generates all reactive power, and generating a pulse control signal to realize the control of the adjustable impedance; and each phase cascade converter adopts quasi-proportional resonance control to track the reference operation current, and generates a corresponding PWM signal to respectively control each phase cascade converter.

The invention relates to a visual on-load voltage regulation tap switch control system, device and medium, which comprises a single chip microcomputer control circuit, the single chip microcomputer control circuit is connected with a signal processing circuit and a power supply circuit, and the signal processing circuit is connected with a voltage zero cross detection circuit, a voltage sensor and a data acquisition unit. The voltage zero-cross detection circuit, the voltage sensor, the data acquisition unit and the power supply circuit are all connected with the isolation reduction transformer, and the isolation reduction transformer is connected with the low-voltage side voltage of the distribution transformer; the single-chip microcomputer control circuit is further connected with a switch position sensor, a communication circuit, a switch drive circuit and a thyristor trigger circuit. The communication circuit is in communication connection with a remote computer through an RS485. The method has the advantages of realizing automatic voltage regulation conversion, stabilizing voltage, accurately setting visual parameters and realizing non-impact voltage regulation.

A high-efficiency power electronic voltage regulating device with a reclosing function is connected in series with a low-voltage line and comprises a silicon controlled bypass switch, a series power unit, a parallel power unit, an input filtering unit, an output filtering unit, a controller, a topology change-over switch, a mechanical bypass switch, an input switch, an output switch and the like. Under a normal working condition, power is supplied to a user through the silicon controlled bypass switch; through an AI pre-judgment technology, a power grid voltage drop or increase trend is pre-judged, and a series power unit is conducted in advance; a topology change-over switch is connected to form a boost or buck topology, and when the voltage of a power grid is too low or too high, the normal voltage of a user is ensured through PR closed-loop control; when the rear-end line / load breaks down, reclosing control is carried out; and voltage upper and lower limits are adjusted remotely. The device utilizes the AI pre-judgment technology, has the characteristics of stable voltage, no need of input / output commutation and the like, solves the problems of over-high and over-low voltage and automatic reclosing in fault, and improves the high power supply quality and the power supply reliability of users.

The invention relates to a coupled inductor current-limiting type hybrid direct-current circuit breaker topology and a working method. The coupled inductor current-limiting type hybrid direct-current circuit breaker comprises a current-carrying part and a breaking part, the current-carrying part is formed by connecting an ultra-fast mechanical switch UFD and a load change-over switch LCS in series, the breaking part comprises a bridge circuit, a first branch circuit, a second branch circuit, a third branch circuit, a fourth branch circuit, a fifth branch circuit and a sixth branch circuit, the fourth branch circuit is formed by connecting a thyristor, a coupling inductor and a primary side inductor in series to form a current-limiting branch circuit, and the fifth branch circuit is formed by connecting a secondary side inductor and a secondary side inductor. The sixth branch is formed by connecting a secondary side inductor of a coupling inductor with a thyristor in series and then connecting the secondary side inductor with a capacitor in parallel; the current limiting of the fault current is realized through the fourth branch, the fault breaking of the primary side inductor of the coupling inductor of the fourth branch is completed through the coupling effect of the secondary side inductor of the coupling inductor of the sixth branch, the peak value of the fault current is obviously reduced, and the breaking time is obviously shortened; the circuit breaker can quickly respond to faults of three working modes of current limiting breaking, reclosing and small current breaking; and the breaking part of the circuit breaker adopts the thyristors instead of the IGBTs, so that the cost of the circuit breaker is reduced.

According to the mechanical direct-current circuit breaker based on the variable inductor and the method, in the circuit breaker, a switch branch comprises a vacuum switch VB and a current sensor which are connected in series; the reverse injection branch is connected in parallel to the two ends of the vacuum switch VB, comprises a pre-charging capacitor, a discharging thyristor, a multi-stage series inductor and a parallel thyristor module, and is selectively connected in series with the multi-stage series inductor according to the detected fault current so as to realize variable inductance; a reverse injection current is formed to realize current zero passage and arc quenching of the VB fracture of the vacuum switch; the energy consumption branch is connected in parallel to two ends of the vacuum switch VB and is used for dissipating residual energy in the loop after the mechanical direct current circuit breaker is switched off; the controller is connected with the current sensor and the thyristors and used for judging the number of inductors needing to be input according to the rise rate and amplitude of fault current and controlling the corresponding thyristors to be switched on, and graded inductor series-in and reverse current injection of the multi-stage series inductors of the variable inductor are achieved.

The invention discloses a distributed fluorescent optical fiber temperature acquisition method for an excitation system, and the method comprises the steps: constructing a distributed fluorescent optical fiber sensing network for a silicon controlled rectifier device in the excitation system, and enabling a fluorescent optical fiber to be attached to the surfaces of an SCR device and a matched radiator; an adaptive excitation light source is adopted to inject excitation light into the fluorescence optical fiber, and the excitation optical fiber generates a fluorescence signal related to the temperature; receiving the fluorescence signal through a signal acquisition and demodulation module, and combining a specific temperature measurement algorithm and a positioning technology; the fluorescent optical fiber and the signal acquisition and demodulation module adopt an anti-electromagnetic interference packaging structure to shield interference signals in a complex electromagnetic environment; the upper computer is used for receiving the demodulated temperature data, temperature field reconstruction and real-time display of the SCR device are completed, and early warning is triggered when the temperature is abnormal. High precision, anti-electromagnetic interference, low cost and easy installation can be realized, and the temperature distribution of the device can be fully covered.

The invention relates to the technical field of power system reactive compensation, and discloses an intelligent integrated hybrid dynamic reactive compensation control system which comprises an execution unit and an intelligent control unit. The execution unit comprises a static synchronous compensator unit and a thyristor switched capacitor unit; the intelligent control unit comprises a system state monitoring module, an impedance parameter feed-forward mapping table storage module and an active transient pre-suppression coordinator. A three-stage handover control process is executed through an active transient pre-suppression coordinator, a static synchronous compensator unit is controlled to output compensation power in advance before a thyristor switching capacitor unit acts, and reactive power impact at the switching moment is actively stabilized; meanwhile, according to the new system impedance state after switching, the optimal control parameter set is retrieved and loaded from the mapping table, and the problem of mismatching of the control parameters is solved. According to the invention, high-efficiency cooperation of high-capacity step compensation and rapid continuous adjustment is realized, and the voltage stability of the power grid is improved.

This invention relates to the field of DC circuit breakers, and discloses a thyristor-type DC circuit breaker and its control method. The DC circuit breaker structure is a thyristor T... m1 Anode-connected thyristor T m2 The cathode forms the A terminal of the circuit breaker, T m1 Cathode connection T m2 The anode of the thyristor forms the B terminal of the circuit breaker; the thyristor T p1 anode, thyristor T p2 The cathode is connected to terminal A; T p1 Cathode connection T p2 After anode, it passes through resistor R in sequence. g Switch RCB g Grounding; T p1 Cathode connection T p2 After the anode, it also passes through inductor L p Capacitor C is connected to terminal B; one end of the surge arrester MOV is connected to terminal T. p1 The cathode is connected to the first terminal, and the other end is connected to the B terminal. This invention has a simple structure and significant cost advantages; under normal operating conditions, only a single thyristor is conducting, resulting in extremely low losses and extremely high circuit breaker efficiency. Combined with control methods, it can actively and reliably connect or disconnect bidirectional operating current or bidirectional fault current; it can also achieve fast reclosing functionality.

The application provides a trigger monitoring device and energy taking method for a thyristor stage circuit in a direct current energy release device, and the trigger monitoring device comprises a fast energy taking circuit 1, a large-capacity energy taking circuit 2, an overvoltage protection circuit 7 and a post-stage function circuit 8; the fast energy taking circuit 1 is used for taking energy during the charging process of the thyristor stage circuit, supplying energy to the overvoltage protection circuit 7, taking energy from an alternating current harmonic when the charging of the thyristor stage circuit is completed and the alternating current harmonic exists between the two ends of the thyristor 9, and supplying energy to the large-capacity energy taking circuit 2 through a one-way current circuit 13; the large-capacity energy taking circuit 2 is used for taking energy from the two ends of the thyristor 9 in a direct current voltage energy taking mode and supplying energy to the post-stage function circuit 8; the fast energy taking and the large-capacity energy taking are combined, the fast energy taking makes the overvoltage protection circuit 7 enter the working state as soon as possible, and the large-capacity energy taking ensures the normal working of the trigger monitoring device.

The invention relates to the technical field of wind driven generator control, in particular to a wind driven generator blade electric pulse deicing device thyristor control method, which comprises the following steps of: acquiring multi-dimensional data and fusing the multi-dimensional data into a blade working condition sensing data set to provide a rich and comprehensive information basis; the method comprises the following steps: acquiring blade surface icing thickness distribution data by acquiring a multi-time-sequence data training model and combining calibration data; differentiated division of energy demands is realized by dividing pulse energy demand levels and outputting a distribution matrix; the accuracy of the control parameters is improved by calculating the thyristor conduction angle adjusting quantity and the pulse width modulation parameters; low-temperature compensation correction is performed on the thyristor, so that the reliability of a trigger pulse sequence in a low-temperature environment is ensured; by executing differential electric pulse deicing operation, the deicing efficiency and pertinence are improved; the self-adaptive optimization control of the deicing process is realized by acquiring the deicing completion degree in real time and dynamically updating the regional energy density distribution matrix.

The application relates to a silicon carbide thyristor based on an external electrode turn-off extraction structure and a preparation method thereof, which comprises the following steps: sequentially stacking an N-type 4H-SiC substrate, a P-type 4H-SiC buffer layer, a P-type 4H-SiC drift layer and an N-type 4H-SiC gate layer from bottom to top; arranging a groove in the N-type 4H-SiC gate layer and the P-type 4H-SiC drift layer; and arranging a P-type 4H-SiC anode region, a first ohmic contact layer, a passivation layer, an etching corner protection region, a P-type 4H-SiC extraction region, an N-type 4H-SiC heavily doped region, a second ohmic contact layer and an Al contact layer. The first ohmic contact layer arranged on the P-type 4H-SiC extraction region serves as an external control electrode for controlling the drift layer and the buffer layer. By introducing the external control electrode, the thyristor is beneficial to fast switching in a switching or pulse working state, and the working frequency of the thyristor is improved.

The utility model relates to the technical field of temperature control, and particularly discloses an integrated alternating current temperature controller and a temperature control system, the integrated alternating current temperature controller is formed by integrating a temperature control module, a temperature acquisition module and a silicon controlled rectifier power output adjusting module in an outer shell to form a whole body, and the temperature control module, the temperature acquisition module and the silicon controlled rectifier power output adjusting module are installed on site. The temperature control module, the temperature acquisition module and the silicon controlled rectifier power output adjusting module need wiring operation due to mutual independence in the prior art, field wiring difficulty and maintenance difficulty are reduced, the field installation process is simplified, meanwhile, the three modules are directly integrated in one shell, the situation that one shell is adopted independently is avoided, and the cost is reduced. And the size is greatly reduced, and the device is more suitable for an environment with limited space.

This invention belongs to the field of linear motor current disturbance suppression, specifically relating to a method and system for suppressing switching current disturbances in a segmented power supply long stator linear motor. It aims to solve the problems of long switching times and large current fluctuations in existing linear motors. The invention includes: real-time tracking and acquisition of the mover position 's' of the segmented power supply long stator linear motor, and calculation of an adjustment factor 'δ' based on the current mover position 's'; applying the adjustment factor 'δ' to the proportional controller, integral controller, and feedforward controller of the segmented power supply long stator linear motor to suppress disturbances during thyristor switching, thereby achieving current disturbance suppression during the segmented power supply long stator linear motor switching process. This invention can effectively suppress the cumulative amplification of disturbance errors during the switching process of the segmented power supply long stator linear motor, achieving a rapid decrease in current and a low overshoot with a rapid increase during the switching process.

A circuit (1) is specified, comprising a power thyristor device (2), in which-a gate (21) of the power thyristor device (2) is connected to an internal reference (10) of the circuit (1) via a first switch (31); and-the cathode (22) of the power thyristor device (2) is connected to an internal reference (10) of the circuit (1) via a second switch (32). Further, a method of operating a circuit (1) is specified.

The utility model discloses a silicon controlled rectifier valve group with an air cooling heat dissipation assembly, which relates to the technical field of heater control and comprises an accommodating box, a plurality of groups of paired radiators are arranged in an inner cavity of the accommodating box, and silicon controlled rectifiers are clamped among the groups of radiators. The radiator is used for absorbing heat generated by the thyristor; the heat dissipation box is used for bearing the containing box, a plurality of heat dissipation fans are arranged in the heat dissipation box, the positions of all the heat dissipation fans correspond to the positions of all the sets of radiators, and the heat dissipation fans are used for blowing airflow to the heat dissipation fans; and the valve group control board is used for sending trigger signals to the silicon controlled rectifiers and controlling the on and off of the silicon controlled rectifiers. The silicon controlled rectifier valve group with the air cooling heat dissipation assembly achieves the technical effects of accurately regulating and controlling the temperature of the silicon controlled rectifier and improving the heat dissipation performance of the silicon controlled rectifier assembly.

This invention relates to the field of industrial frequency furnace control technology, specifically to an industrial frequency furnace temperature control cabinet and a furnace temperature control method. A data acquisition module collects real-time data on the industrial frequency power supply input voltage and furnace load current. A disturbance prediction module predicts the trend of grid voltage fluctuations or load impedance changes based on a real-time data analysis model. A control unit communicates with the data acquisition module and the disturbance prediction module, generating a thyristor trigger signal based on the output of an adaptive dual-loop controller. Based on real-time data or predicted trends, the control unit identifies whether the current disturbance source is a grid-side disturbance or a load-side disturbance. When a grid-side disturbance is identified, the adaptive dual-loop controller is adjusted to increase the regulation weight of the voltage loop, allowing the voltage loop to dominate the generation of the thyristor trigger signal to compensate for voltage fluctuations. This invention achieves precise decoupling and rapid response to dual disturbances, while simultaneously improving the long-term reliability of the system.

This invention relates to a single-event latch-up evaluation method for advanced process technologies, comprising: constructing a high-energy particle incident model using the Geant4 Monte Carlo simulation tool; constructing and calibrating a three-dimensional basic device model using the TCAD simulation tool; constructing a standard cell circuit containing parasitic effects, extracting the parasitic thyristor structure of the standard cell circuit, and identifying sensitive regions of the parasitic thyristor structure; performing transient effect simulation on the identified sensitive regions based on the high-energy particle incident model to confirm whether latch-up is triggered; introducing anti-latch-up hardening measures for the sensitive regions, and performing simulation verification on the hardened standard cell circuit under the high-energy particle incident model; if the hardened standard cell circuit does not trigger latch-up, the anti-latch-up hardening measures are deemed effective. This method provides a systematic and automated solution that can fundamentally characterize the complex parasitic effects of advanced devices.

The utility model relates to the technical field of electric energy conversion, and discloses a power supply device, which comprises a shell with an accommodating cavity; the pressure regulating piece is arranged in the accommodating cavity; the heat dissipation piece is arranged in the containing cavity, and the heat dissipation piece and the pressure adjusting piece are arranged at intervals; and the rectification assembly is arranged in the accommodating cavity, the rectification assembly comprises six silicon controlled rectifier modules, the six silicon controlled rectifier modules are sequentially connected in series, and the silicon controlled rectifier modules are fixed on the heat dissipation piece and electrically connected with the voltage regulation piece. According to the utility model, the voltage regulating piece is electrically connected with the silicon controlled rectifier module, so that the input voltage can be regulated to be matched with the voltage required by the load; the silicon controlled rectifier module is adopted as a rectification structure, the fixing mode of the silicon controlled rectifier module and the heat dissipation piece is simpler, installation steps are simple, and assembly efficiency is high; the silicon-controlled module is fixed on the heat dissipation piece, so that the temperature of the silicon-controlled module can be reduced, and the service life of the silicon-controlled module is further prolonged.

A resistance and inductance current-limiting hybrid high-voltage direct-current circuit breaker topology and a control method thereof. The current-carrying branch of the topology is composed of a UFD and a load transfer switch LCS in series, and the two ends are respectively connected with DC line interfaces. The commutation branch is divided into two pairs, and each group of commutation branch is composed of a thyristor and a plurality of diodes in series. The transfer branch is composed of an IGBT and a thyristor in series. The current-limiting branch is composed of three parallel branches, including a branch composed of a thyristor, a plurality of diodes in series, and a reverse-parallel thyristor connected with a capacitor in series, a reverse-parallel thyristor branch, and a branch composed of an inductor connected with a resistor in parallel and a thyristor in series. The charging branch is composed of a capacitor connected with a thyristor in series and grounded. The breaking branch is composed of an IGBT and a metal oxide arrester MOA in parallel. Based on the thyristor commutation cooperation, the use of a large number of thyristors is reduced, and the cost is reduced under the characteristics of meeting the voltage and current resistance.

A generator circuit breaker includes a main current branch, a current-limiting transfer branch, a freewheeling branch and a fast switch. The main current branch includes a high-speed mechanical switch S1 and a high-speed mechanical switch S2 in parallel, wherein two ends of each of breaks of the high-speed mechanical switch S1 and the high-speed mechanical switch S2 are directly connected with wire outlet ends of the circuit breaker respectively. One end of the current-limiting transfer branch is connected in parallel to one end of the main current branch and the other end of the current-limiting transfer branch is connected with the other end of the main current branch via a fast switch S3, wherein the current-limiting transfer branch includes a transfer capacitor C, an inductor L, thyristor components T1 and T2, and a current-limiting resistor R.

The invention relates to a switch bridge arm module cabinet, a control method thereof and a flexible loop closing device. The switch bridge arm module cabinet comprises a cabinet body and a thyristor switch valve. The cabinet body is provided with an installation space and a heat dissipation air channel. The heat dissipation air channel is communicated with the installation space and is provided with an air channel port communicated with the outside of the cabinet body. The thyristor switch valve is arranged in the cabinet body and comprises a pipe valve body and a first heat dissipation fan. Wherein the pipe valve body is arranged in the mounting space. The air inlet end of the first cooling fan faces the pipe valve body, and the air outlet end of the first cooling fan faces the interior of the cooling air channel. According to the switch bridge arm module cabinet, the pipe valve body is installed in the cabinet body, the independent heat dissipation air channel is further arranged in the cabinet body, and the first heat dissipation fan is correspondingly configured for the pipe valve body. Therefore, the switch bridge arm module cabinet can utilize the heat dissipation fan to drive airflow to perform forced air cooling on the pipe valve body, and heat is converged into the heat dissipation air channel to be discharged out of the cabinet body, so that effective heat dissipation is realized.

The embodiment of the application provides a low conduction resistance high robustness bidirectional thyristor electrostatic protection device and a manufacturing method, which comprises a P-type substrate, an N-type buried layer, a P-type well, a P-type shallow well and the like; the second N+ injection area and the third N+ injection area are directly connected through a wire, and a P-type shallow well PB with high concentration is arranged directly below the second N+ injection area and the third N+ injection area, which can play an important role in reducing the forward and reverse conduction resistance and trigger voltage of the device; the first P+ injection area and the first N+ injection area are connected together and serve as an anode of the device, and the second P+ injection area and the fourth N+ injection area are connected together and serve as a cathode of the device, so that the device can effectively protect the core circuit of the chip and avoid the risk of latching in the case of significantly reducing the conduction resistance of the device. The device can be applied to ESD protection of an I / O port with a working voltage of-5.5-5.5V.

The utility model relates to the technical field of silicon controlled rectifier dimming, in particular to a multi-color-temperature multi-power switching circuit compatible with silicon controlled rectifier dimming, which comprises a rectifying and filtering module, a silicon controlled rectifier dimming constant-current module, an MCU (Microprogrammed Control Unit) linear power supply module, a power failure detection module, a color temperature control module, a double-path PWM (Pulse-Width Modulation) dimming constant-current module and a load module, the input end of the power failure detection module is electrically connected with the rectification filtering module and used for detecting the power failure condition of the rectification filtering module, and the output end of the power failure detection module is electrically connected with the analog input end of the color temperature control module. The two pulse width modulation ends of the color temperature control module are electrically connected with the two pulse width modulation ends of the double-path PWM dimming constant-current module in a one-to-one correspondence manner, so that not only can a silicon controlled rectifier dimmer be compatible for brightness adjustment, but also the color temperature and the power can be flexibly and conveniently switched at any time; and meanwhile, the problem that the color temperature and the power are switched mistakenly due to the fact that a switch is turned on for several times due to mistakes in the actual use process is solved, and then the use experience of customers is improved.

A compressor PTC starter belongs to the technical field of motor starting devices. It includes a housing and a housing cover; a thyristor (SCR) with its lower part disposed in the housing cavity and its upper part inserted into the housing cover cavity; a first PTC starting mechanism, a second PTC starting mechanism, and an S-connector disposed within the housing cavity. The first PTC starting mechanism includes a flat cylindrical first PTC, and the second PTC starting mechanism includes a cylindrical second PTC. The first and second PTC starting mechanisms are electrically connected to each other through the first PTC. The key feature is that the first PTC is horizontally positioned at the bottom of the housing cavity with its downward-facing side as a positioning support and its upward-facing side as an elastic clamp, and is subjected to contact pressure from the housing cover on the upward-facing side. The second PTC is longitudinally inserted into the housing cavity. Advantages: excellent stability; reduced steady-state power consumption for energy saving; improved operational reliability and service life; quick and convenient installation; no installation-related malfunctions.