833 results about "Voltage reduction" patented technology

The invention provides a clock input buffer and electronic equipment. The clock input buffer comprises a multi-protocol input circuit, a level conversion circuit, a step-down circuit and a clock buffer circuit. The multi-protocol input circuit is adjusted to different working modes through a control signal transmitted by the control unit so as to be compatible with various input protocols, the multi-protocol input circuit processes an input signal based on a target working mode, and the level conversion circuit performs level shifting on an output signal of the multi-protocol input circuit so as to realize multi-protocol conversion. The voltage reduction circuit is used for converting the output signal into a low-voltage domain signal so as to meet the working voltage requirement of the clock buffer circuit, and meanwhile, the voltage reduction circuit is used for reducing the power supply voltage so as to provide low-voltage power supply voltage for the clock buffer circuit; therefore, the clock buffer circuit can buffer high-speed signals in different input protocols and voltage ranges by using a low-voltage domain device, and the application scenarios of the clock input buffer are greatly expanded.

The utility model relates to the related field of voltage reference circuits, in particular to a voltage reference circuit with a simple structure and capable of realizing high-voltage application, which comprises a resistor R5 connected with a high-voltage power supply, MOS (Metal Oxide Semiconductor) transistors PM1, PM2 and PM3, triodes Q0, Q1 and Q2, and MOS transistors NM0 and NM5, compared with a traditional structure, the circuit is simple in structure and easy to implement, and due to the fact that an operational amplifier and a band-gap reference circuit are not needed, and the number of electronic components is small, the circuit area is greatly reduced; the high-voltage-resistant voltage-reducing and voltage-stabilizing circuit is simple in structure, low in process requirement, free of a high-voltage process and free of additional special devices, adopts a low-voltage process to enable the circuit to generate a low-voltage reference capable of bearing a high-voltage power supply of more than 100V, achieves the purposes of high-voltage resistance, voltage reduction and voltage stabilization, and has the characteristics of low cost and convenience in design, so that the high-voltage-resistant voltage-reducing and voltage-stabilizing circuit has very high use value and application value and is suitable for popularization.

The utility model discloses outdoor operation equipment which comprises a battery bin with an opening, the battery bin comprises a bottom plate and a plurality of side plates arranged on the bottom plate in a surrounding mode, and at least one side plate is provided with a first terminal; the battery pack is provided with a second terminal, the battery pack is configured to be detachably assembled in the battery compartment along the opening, and when the battery pack is assembled in the battery compartment, the second terminal is in electric signal connection with the first terminal; the power management device is connected with the first terminal through a wire harness, a first voltage reduction module is arranged in the power management device, and the first voltage reduction module can obtain the voltage of the battery pack and perform voltage reduction processing; and the cooling fan is arranged on the side plate and is connected with the power supply management device through a wire harness, the cooling fan can obtain the electric energy of the battery pack subjected to the voltage reduction processing of the first voltage reduction module, and the battery pack can be cooled through the operation of the cooling fan. According to the outdoor operation equipment, wire harnesses connected to the battery bin, the cooling fan and the power management device can be saved, and the overall layout is more reasonable.

A Hybrid Switched Capacitor Converter (HSCC) topology is presented that is suitable for high conversion ratio Point-of-Load (PoL) applications. The topology specifically targets 48V to 1V power delivery in space-based high-performance computing systems, where size and weight are important considerations, along with device de-rating for radiation tolerance. One implementation merges an initial 2:1 switched capacitor conversion stage with a symmetric dual inductor hybrid (SDIH) conversion stage, reaping benefits of both. The SDIH stage offers reduced component count and an excellent switch stress figure of merit, while the initial 2:1 voltage reduction stage significantly reduces the volume of flying capacitors, enabling compact size and low weight.

The invention discloses an energy-saving server operation method and system based on dynamic load adjustment, and relates to the technical field of servers. The energy-saving server operation method comprises the steps that a plurality of heterogeneous resources in a single physical machine are made to generate a plurality of virtual heterogeneous resource units through a pooling method and a virtualization method, and the heterogeneous resources in each virtual heterogeneous resource unit are different in proportion. According to the method, through establishment of a first framework, the first framework supports collaborative management and scheduling among various heterogeneous resources, the first framework dynamically adjusts the scale of a virtual heterogeneous resource unit for a single physical machine through load calculation, comparison and triggering conditions, and the virtual heterogeneous resource unit is optimized on the basis of the reduced scale. And meanwhile, different voltage reduction and frequency reduction are carried out on each heterogeneous resource in a single physical machine, so that the energy consumption of the physical machine is reduced, the voltage reduction and frequency reduction are respectively carried out on each heterogeneous resource, and the effective cooperative scheduling of the heterogeneous resources is ensured.

The invention discloses a self-excitation cooperative energy management circuit for enhancing TENG output performance, and belongs to the technical field of power electronics. The self-excitation cooperative energy management circuit is connected to the rear end of the TENG and comprises a self-charge excitation circuit, a capacitance converter circuit and a voltage reduction circuit, and the self-charge excitation circuit is connected to the rear end of the TENG, comprises a rectification circuit and is used for charge excitation of the TENG, rectification and output of a first direct current signal; the capacitance converter circuit is connected to the rear end of the self-charge excitation circuit and is used for performing power conversion on the first direct-current signal and outputting a second direct-current signal; the voltage reduction circuit is connected to the rear end of the capacitance converter circuit, comprises a switching circuit and is used for reducing voltage and increasing current of the second direct-current signal and outputting a third direct-current signal. According to the self-excitation collaborative energy management circuit, the charge output capability of the TENG can be greatly improved, and an electronic device can be directly driven.

The invention belongs to the technical field of new energy automobile lithium battery thermal runaway early warning, and particularly discloses a lithium battery thermal runaway gas early warning system. The method is used for solving the problem that thermal runaway cannot be rapidly and accurately detected and early warning cannot be carried out in advance in the existing monitoring technology. The early warning system comprises a main control unit, a core processing unit, a graphical user interface, a dual-frequency driving signal generation circuit, a spectral signal dual-frequency demodulation circuit, a temperature control circuit, a constant current source and overcurrent protection circuit, a spectral data acquisition circuit, a graphical user interface, an optical system, a gas sampling device and an early warning model. The power supply of the early warning system adopts a three-stage voltage reduction design, and comprises an AC-DC switching power supply, a DC-DC switching power supply and a low dropout regulator. Based on the off-axis integral cavity optical path coupling technology of the double-optical wedge group, the light beam angle is accurately adjusted through the double optical wedges of the stepping motor, a beam combiner does not need to be used, and the light energy utilization rate and the detection sensitivity are improved.

The invention discloses a power supply control system and method for an eVTOL low-voltage distribution box, and relates to the technical field of power supply control, and the system comprises a multi-source double-bus power supply unit, a voltage reduction unit and an output unit. The multi-source double-bus power supply unit comprises a first bus independent power supply channel and a second bus independent power supply channel, the first bus independent power supply channel and the second bus independent power supply channel are isolated based on a contactor, the first bus independent power supply channel comprises x heterogeneous power sources and x ideal diodes, and the x heterogeneous power sources comprise a high-voltage-to-low-voltage DC-DC power source, a ground power source and n lithium battery power sources. The second bus independent power supply channel comprises y paths of heterogeneous power supplies and y ideal diodes, and the y paths of heterogeneous power supplies comprise y paths of lithium battery power supplies; the step-down unit comprises m paths of DC-DC step-down converters; and the output unit comprises m ideal diodes which are connected in parallel with the output end of the DC-DC buck converter. According to the invention, the stability and quality of power supply are ensured, and airborne equipment is ensured to work in a stable voltage and current environment.

According to the control circuit and the control method of the vehicle charger disclosed by the invention, the rectifier bridge of the bridge PFC is removed, so that the number of switching devices is reduced, the topological cost is reduced, and the loss is reduced; power factor correction is realized through average current control, and stable 400V direct current is output for post-stage power supply after power grid side 220V alternating current is rectified; the rear-stage resonant converter is highly symmetrical in structure and has the advantages of high power density, strong energy interactivity, input and output isolation and easy realization of soft switching; a hybrid modulation strategy is adopted for the resonant converter, frequency modulation and extended phase shift segmented modulation are adopted under the normal load condition, the problem that the frequency modulation range is narrow during voltage reduction is solved, intermittent Bang-Bang charge control is switched under the light load condition, and the problems that the output voltage drift is high and the efficiency is reduced during light load are solved; therefore, the charging efficiency of the vehicle-mounted charger is improved.

The application belongs to the technical field of high-voltage electrical test and detection, and relates to a disc-type insulator alternating current withstand voltage multi-channel leakage current detection method and system. The method comprises the following steps: setting a parameter set comprising a withstand voltage, a frequency, a voltage raising and stabilizing strategy, sampling parameters, a judgment threshold and a consistency threshold, and generating a version identifier; constructing equipotential boundaries and voltage grading electrodes, and organizing a high-voltage end of a to-be-detected insulator, an independent measurement loop and a common ground reference point; synchronously sampling each loop during voltage raising and stabilizing to obtain a multi-channel sequence; filtering and windowing the sequence to obtain an effective value and a stability index; compensating and calculating a consistency index; combining the threshold, a ground state and a communication state to output a judgment and an event marker, triggering voltage reduction or disconnection, and structuring evidence. The technical scheme of the application is suitable for batch detection of alternating current withstand voltage, and can realize judgment robustness and channel consistency control.

The invention discloses a voltage conversion module, a chip, electronic equipment and a circuit control method, and belongs to the technical field of circuits. The voltage regulation circuit comprises a battery module and a load, and under the condition that the battery module provides a first voltage within a first preset voltage range for a voltage conversion module, the voltage conversion module is used for reducing the first voltage provided by the battery module and outputting a second voltage, maintaining the second voltage stable or maintaining the voltage reduction ratio between the first voltage and the second voltage stable; and under the condition that the battery module provides a third voltage in a second preset voltage range for the voltage conversion module, the voltage conversion module is used for boosting the third voltage provided by the battery module and outputting a fourth voltage to maintain the fourth voltage stable or maintain the boosting ratio between the third voltage and the fourth voltage stable. And the flexibility of adjusting various input voltages by the voltage conversion module is improved.

The invention provides a voltage stabilizer based on voltage conversion, a control method and a storage medium, and the voltage stabilizer comprises a PFC chopping boost circuit which receives an input alternating current and a boost duty ratio, carries out the chopping boost of the input alternating current based on the boost duty ratio, and outputs a high-voltage chopping alternating current signal; the positive and negative half-cycle filter circuit is connected with the PFC chopping booster circuit and is used for rectifying and filtering the high-voltage chopping alternating-current signal to obtain a positive voltage-stabilizing chopping alternating-current signal and a negative voltage-stabilizing chopping alternating-current signal; the positive and negative half-cycle voltage reduction and stabilization circuit is connected with the positive and negative half-cycle filter circuit, receives the voltage reduction duty ratio, and performs voltage reduction and stabilization on the positive voltage stabilization chopping alternating current signal and the negative voltage stabilization chopping alternating current signal based on the voltage reduction duty ratio to obtain a preset actual positive electric signal and a preset actual negative electric signal; and the output voltage merging circuit is connected with the positive and negative half-cycle voltage reducing and stabilizing circuit, and integrates the preset actual positive electric signal and the preset actual negative electric signal to obtain a voltage stabilizing electric signal. According to the invention, the voltage fluctuation is quickly responded at low cost.

The invention discloses a passive multi-stage voltage soft turn-off circuit suitable for SiC MOSFETs. The passive multi-stage voltage soft turn-off circuit comprises a driving main branch, a plurality of voltage reduction branches, a driving resistor, a discharging resistor and a driving power supply circuit. The driving power supply circuit is powered by a positive power supply VCC when the SiC MOSFET is turned on, and is powered by a negative power supply VEE when the SiC MOSFET is turned off. The voltage reduction branches are connected to the two ends of the driving main branch in parallel. The step-down branch comprises a step-down delay unit, a step-down action unit and a step-down unit which are sequentially connected in series; the delay time of each step-down branch is increased in sequence, and the step-down voltage drop is increased in sequence. According to the invention, the voltage level can be conveniently controlled by changing the number of the voltage reduction branches, an additional power supply module does not need to be added, the voltage reduction time can be controlled by the voltage reduction delay branches, the degree of freedom of driving is greatly increased, and the circuit is low in complexity, high in voltage reduction degree of freedom and high in reliability.

A pulse generator is disclosed. The pulse generator includes a DC source; a plurality of switches, a transformer; and a pulsing output. The pulse generator can be coupled with a plasma chamber. The pulsing output outputs high voltage pulses having a peak-to-peak voltage greater than 1 kV and a voltage portion between consecutive high voltage bipolar pulses that has a negative slope that substantially offsets the voltage reduction on a wafer within a plasma chamber due to an ion current. The resulting voltage at the wafer may be substantially flat between consecutive pulses.

The utility model discloses a power supply device of a tablet personal computer and the tablet personal computer, and relates to the field of power supply. The input positive end of a voltage reduction module is connected with the output positive end of a power supply, the input negative end is connected with the output negative end of the power supply, and the output positive end is connected with the positive electrode of a power supply loop of the tablet personal computer; the output negative end is connected with the negative electrode of a power supply loop of the tablet computer; the voltage reduction module is used for reducing the output voltage of the power supply and then supplying power to the tablet computer; the simulation module is connected with a detection end of a main control chip of the tablet computer, and the simulation module is used for generating a simulation in-place signal when the battery is not in place, so that the main control chip detects that the battery is in place and controls the power supply loop to supply power to the tablet computer. A simulation in-place signal provided by the simulation module can avoid the situation that when the battery is not installed, the main control chip cannot detect that the battery is in place and cannot control the tablet personal computer to be started. The voltage reduction module can reduce the voltage output by the power supply and then supply power to the tablet personal computer, and the voltage reduction module and the simulation module replace a battery.

The utility model discloses a double-coil contactor, and the contactor comprises a power module which is used for accessing an external power supply voltage to generate a DC voltage, so as to enable a coil loop to be electrically conducted, and carrying out the voltage reduction of the DC voltage, and obtaining a power supply voltage; the external power supply is an AC power supply or a DC power supply; the sampling comparison module is used for sampling the direct-current voltage and generating a working voltage according to the power supply voltage when the sampling voltage is greater than a preset voltage threshold value; the driving module is used for controlling the pull-in coil loop to be electrically conducted based on the direct current voltage in response to the power supply voltage and the working voltage, and controlling the pull-in coil loop to be electrically disconnected in response to the trigger signal; the time delay module is used for generating a trigger signal when the duration of electrical conduction of the pull-in coil loop reaches a preset duration. According to the double-coil contactor, the AC voltage of the AC power supply can be converted into the DC voltage for control through the power supply module, and the application range of the double-coil contactor is greatly expanded.

The utility model provides a master control device and a carrier, the master control device comprises a master control circuit board, a master control unit and a plurality of module interfaces, the master control unit and the module interfaces are both arranged on the master control circuit board, the master control device further comprises a power supply voltage conversion module and a power supply input interface, the power voltage conversion module and the power input interface are both arranged on the main control circuit board, the power supply voltage input end of the main control unit is electrically connected with the main control voltage output end of the power voltage conversion module, and the input end of the power voltage conversion module is electrically connected with the power input interface. The plurality of module voltage output ends of the power supply voltage conversion module are electrically connected with the plurality of module interfaces respectively. According to the utility model, the power supply voltage conversion module is directly integrated on the main control circuit board of the main control device, so that the power supply voltage conversion module for realizing voltage reduction does not need to be independently arranged at other positions of the carrier, the number of cables in the carrier is reduced, the wiring space is saved, and the space utilization rate is improved.

The invention relates to the technical field of energy storage, in particular to a string type confluence and transformation integrated energy storage system which comprises a direct current energy storage cabinet and a string type confluence and transformation all-in-one machine, and an energy storage converter cabinet, an alternating current confluence cabinet and a transformer cabinet are integrated in the string type confluence and transformation all-in-one machine. The energy storage converter cabinet comprises a plurality of groups of string type energy storage converters and pre-charging modules, and each direct-current energy storage cabinet is connected with the direct-current side of the energy storage converter through the pre-charging module in a one-to-one correspondence manner; the alternating current confluence cabinet is used for collecting the alternating current electric energy output by all the energy storage converter cabinets and outputting the collected alternating current electric energy to a power grid after voltage boosting and voltage reduction through the transformer cabinet; and the pre-charging module is used for controlling the on-off of the pre-charging relay by detecting the voltage difference of the direct-current bus capacitor of the energy storage converter in real time so as to complete the pre-charging operation of the direct-current side bus capacitor of the energy storage converter. By highly integrating the energy storage converter cabinet, the alternating current convergence cabinet and the transformer cabinet, the integration level and the space utilization rate of the energy storage system are effectively improved.

The present invention belongs to the technical field of flow field velocity testing and relates to a device for measuring flow field velocity parameters. The present invention discloses a PIV system that uses a single phase-locked signal to trigger camera shooting at high frequency multiple times, and can achieve high-frequency continuous shooting in a rotor channel of a rotating machine. The device comprises a compressor, a camera, rotor blades, a rotor shaft system, an optical fiber sensor, a voltage reduction module, a synchronizer, a laser, a camera, and a laser sheet. The optical fiber sensor outputs a phase-locked signal. The voltage reduction module can reduce the voltage of a 24V high-level signal to a standard control signal voltage of 5V. A signal generator can generate a control signal with a specific frequency and rising edge time under external triggering. The synchronizer is responsible for receiving the control signal transmitted by the signal generator. The high-frequency laser is a dual-cavity Nd:YAG high-frequency laser.

The utility model, which relates to the technical field of the LED, discloses a leakage protection circuit comprising a power supply circuit, a step-down circuit, an LED circuit and a detection circuit. The input end of the power supply circuit is connected to the output pin of the power supply end, the output end of the power supply circuit is connected with the input end of the step-down circuit and the input end of the LED circuit, and the power supply circuit is used for rectifying the output power supply of the power supply end so as to output the power supply to the step-down circuit and the LED circuit; the output end of the step-down circuit is connected with the detection circuit, and the step-down circuit is used for carrying out step-down processing on the power supply output by the power circuit to output reference voltage to the detection circuit; and the detection circuit is respectively connected with the output pins of the power supply end and the LED circuit, and is used for controlling the working state of the LED circuit according to the real-time voltage difference and the real-time voltage between the output pins of the power supply end and the reference voltage output by the step-down circuit. According to the utility model, the working state of the LED circuit can be controlled according to the real-time voltage difference, the real-time voltage and the reference voltage, thereby realizing anti-creeping protection.

A pulse generator is disclosed. The pulse generator includes a DC source; a plurality of switches, a transformer; and a pulsing output. The pulse generator can be coupled with a plasma chamber. The pulsing output outputs high voltage pulses having a peak-to-peak voltage greater than 1 kV and a voltage portion between consecutive high voltage bipolar pulses that has a negative slope that substantially offsets the voltage reduction on a wafer within a plasma chamber due to an ion current. The resulting voltage at the wafer may be substantially flat between consecutive pulses.

The invention provides a repair circuit, a display panel and a display device. The repairing circuit comprises an input module, a first input end of which is connected with a to-be-repaired signal, a first output end of which is electrically connected with a first node, and which is used for carrying out voltage reduction processing on the to-be-repaired signal and then outputting a first input signal; and the processing module comprises a dedelay unit, a shaping unit and a level conversion unit. The control end of the de-delay unit is electrically connected to the first node, the input end is coupled with the corresponding clock signal, the output end is electrically connected to the second node, the de-delay unit is used for performing de-delay processing on the first input signal according to the corresponding clock signal and then outputting a de-delay signal, and the falling edge of the de-delay signal is consistent with the falling edge of the corresponding clock signal; the shaping unit is electrically connected to the second node and is used for shaping the waveform of the dedelayed signal and then outputting a square wave signal; and the level conversion unit is electrically connected to the output end of the shaping unit and is used for performing level adjustment on the square wave signal and then outputting a scanning repair signal.

The invention discloses a battery pack adapter. The battery pack adapter comprises an AC input interface; the primary power supply conversion module is connected with the AC input interface, receives alternating current input and converts the alternating current into first direct current through primary rectification filtering; the transformer is arranged between the primary power supply conversion module and the secondary function output module for voltage reduction; the secondary function output module comprises an adapter electric terminal and a USB output interface, and is suitable for outputting second direct current through secondary rectification filtering; the controller is electrically connected with the secondary function output module to control the second direct current to be selectively distributed to the adapter electrical terminal and / or the USB output interface. According to the technical scheme, the dual functions of tool battery pack charging and consumer electronic equipment charging are achieved only through single equipment, and battery pack adapters of multiple chargers do not need to be carried. In addition, the invention also relates to a combination of the battery pack adapter and the battery pack based on the adapter.

The invention discloses a power supply control circuit and an input and output circuit system, and the circuit employs a multi-stage NMOS tube voltage reduction module to replace a diode structure scheme in the related technology. Through cooperative work of the multi-stage voltage reduction module and the multi-stage voltage boosting module, the problem of current leakage caused by too large gate-source voltage difference of a PMOS tube in a POC circuit in the related technology is solved, and output voltage is recovered to IO power supply domain voltage through the multi-stage voltage boosting module. And a pure MOS device design is adopted, and the problem of inconsistent PN junction voltage in a diode scheme does not need to be considered, so that the layout design does not need an additional isolation region, the circuit area is reduced, and the leakage current is reduced. According to the power supply control circuit, voltage step-by-step control is realized, and customized configuration can be carried out according to different voltage domain scenes. The integrated Schmitt trigger filters power supply noise, the trigger logic of the integrated Schmitt trigger is matched with the stage number of the multi-stage voltage reduction module, correct response under different voltage difference environments is achieved, and the reverse voltage of the circuit meets the design requirement.

The invention discloses a health management method for a GPU computing board card of an audio-frequency integrated signal processor, and belongs to the technical field of audio-frequency integrated signal processing. Multi-dimensional data of a GPU core, a video memory and a power supply module are collected in real time through a sensor, a three-dimensional temperature field is constructed by adopting an inverse distance weighted interpolation algorithm, and a thermal coupling area is accurately positioned; thermal field evolution is predicted based on an LSTM model, and a high-density instruction is dynamically scheduled to an NUMA core with sufficient heat dissipation allowance; aiming at sudden reading and writing of a video memory, a micro piezoelectric fan array is adopted to form vertical airflow (the wind speed is greater than or equal to 4m / s), and dynamic voltage reduction and graded heat dissipation strategies (phase change heat-conducting fins are pre-cooled to reduce the temperature by 8-10 DEG C, and the attack angle of centrifugal fan blades is 45 degrees) are combined. According to the scheme, the heat source recognition precision is improved by 40%, the heat dissipation delay is smaller than or equal to 45 microseconds, the calculation power loss is smaller than or equal to 0.8%, the video memory error rate is smaller than or equal to 1E-6, and high-density calculation heat management is remarkably optimized.

The utility model discloses outdoor operation equipment which comprises a battery bin with an opening, the battery bin comprises a bottom plate and a plurality of side plates arranged on the bottom plate in a surrounding mode, and at least one side plate is provided with a first terminal; the battery pack is provided with a second terminal, the battery pack is configured to be detachably assembled in the battery compartment along the opening, and when the battery pack is assembled in the battery compartment, the second terminal is in electric signal connection with the first terminal; the power management device is connected with the first terminal through a wire harness, a first voltage reduction module is arranged in the power management device, and the first voltage reduction module can obtain the voltage of the battery pack and perform voltage reduction processing; and the cooling fan is arranged on the side plate and is connected with the power supply management device through a wire harness, the cooling fan can obtain the electric energy of the battery pack subjected to the voltage reduction processing of the first voltage reduction module, and the battery pack can be cooled through the operation of the cooling fan. According to the outdoor operation equipment, wire harnesses connected to the battery bin, the cooling fan and the power management device can be saved, and the overall layout is more reasonable.

The invention belongs to the field of direct-current power supply systems for transformer substations, and particularly relates to an intelligent portable storage battery pack open circuit prevention detection method and device. The method comprises the following steps: judging whether a direct-current system operates normally or not through output voltage of a charger and initial voltage of a direct-current bus, if so, connecting a step-down silicon chain to the direct-current bus in series and connecting a storage battery pack to a direct-current power supply system to enable the storage battery pack to bear a conventional load of the direct-current power supply system, and judging whether the loading capacity of the conventional load of the storage battery is qualified or not; if the loading capacity of the conventional load of the storage battery is qualified, the simulated load is connected to a direct-current power supply system, whether the impact resistance of the storage battery is qualified is judged, if the impact resistance of the storage battery is qualified, the simulated load is disconnected, the voltage reduction silicon chain is in short circuit, the final voltage of the direct-current bus is obtained, and whether the performance of the storage battery pack is qualified is judged; the method can comprehensively check the effectiveness of the storage battery, discover the fault of the storage battery in time, verify whether the system can bear a normal load or not, and ensure the operation safety of the DC system.

The invention discloses an overvoltage suppression method based on an intermediate-frequency DRU-MMC direct-current power transmission system, and the method comprises the steps: improving the operation frequency of an offshore alternating-current system to an intermediate-frequency range (such as 100-200Hz), employing a diode uncontrolled rectification unit in a rectification station, and reducing the weight and size of equipment and a platform; aiming at the situation that direct-current voltage is raised due to the fact that power output of an intermediate-frequency DRU-MMC direct-current power transmission system is blocked due to faults of an onshore alternating-current system, an offshore alternating-current system voltage reduction strategy, an offshore alternating-current system frequency increasing strategy and a direct-current energy consumption device switching strategy are cooperatively called in a layered mode, a progressive protection mechanism is formed, and the recovery sequence of the strategies is emphasized. The method is easy to implement, high in reliability, capable of simulating the voltage change characteristic when the DRU-MMC system has the direct current side fault, high in universality and high in application value in actual engineering.

The invention discloses a power amplification module and a control method and system thereof, and belongs to the technical field of plasma generators. Wherein the PDM driving unit adopts a multi-phase PDM voltage reduction amplitude modulation technology and is used for generating two paths of symmetrical and complementary RF driving signals from an external RF driving signal through dead zone delay and logical operation; the BUCK voltage regulating unit comprises a plurality of BUCK circuits connected in parallel and is used for reducing input direct-current voltage into amplitude-modulated direct-current voltage; the RF driving unit is used for generating two paths of symmetrical and complementary RF driving signals; and the H-bridge conversion unit is used for receiving two paths of symmetrical and complementary RF driving signals generated by the RF driving unit and inverting the amplitude-modulated direct-current voltage supplied by the preceding-stage BUCK voltage regulating unit into a radio-frequency power signal to be output to a load. According to the power amplification module, the control method and the control system provided by the invention, the contradiction and unification of high-frequency response and ultra-low loss are realized through the mutual synergistic effect of the multi-phase PDM modulation and the D-type power amplifier topological structure.

The application relates to the technical field of motor control, and discloses a low-voltage motor based on segmented threshold PWM control, which comprises a motor shell, a motor tail cover arranged at the tail of the motor shell, a control circuit board arranged at the middle of the motor tail cover, a device assembly arranged on the surface of the control circuit board, wherein the device assembly comprises a microcontroller arranged on the surface of the control circuit board, the microcontroller is internally provided with a control system, and the device assembly further comprises a PWM signal input unit, a power input and filtering unit, a voltage reduction and stabilization unit, a reverse electromotive force and voltage sampling unit, a motor power driving unit, a current sampling unit and a temperature detection unit arranged on the surface of the control circuit board. The application utilizes segmented threshold control, closed-loop speed regulation architecture and dynamic threshold reconstruction logic to realize shielding of instruction jitter and accurate speed regulation, and the current determination boundary is reconstructed in real time through the speed deviation and the running state, so that the transient response capability of the motor and the hardware safety and reliability under all working conditions are considered.