394 results about "Residual voltage" patented technology

The invention relates to a safe starting control method, device, equipment and medium for a bootstrap drive inverter, and the method comprises the steps: obtaining a detection voltage representing an output filter inductance voltage after responding to any starting event and before formally transmitting a drive signal; comparing the negative voltage with a preset negative voltage safety threshold value; only when the detected voltage is higher than the safety threshold, a driving enable signal is generated to allow the inverter to be normally started; otherwise, generating a driving blocking signal, carrying out detection and judgment again after waiting for preset time delay, and circulating the process until the system state enters the safe area; the method is realized by modifying a control algorithm, no power hardware needs to be added, the starting impact risk is eliminated with low cost, and the contradiction between the hardware limitation of a bootstrap drive circuit and the negative residual voltage possibly existing on the output inductance of the inverter is solved; therefore, the safety problem of direct connection between the impact current and the bridge arm during starting in an unfavorable initial state is solved.

The invention discloses a short-wave strong electromagnetic pulse suppression circuit with direct current and control functions. The short-wave strong electromagnetic pulse suppression circuit comprises an I-stage transient protection circuit, a three-signal circuit and an II-stage transient protection circuit, the I-stage transient protection circuit is formed by connecting two stages of gas discharge tubes in series and is used for protecting a low-frequency part in the lightning electromagnetic pulse or the nuclear power electromagnetic pulse, and the output end of the I-stage transient protection circuit is connected with the three-signal circuit; the three-signal circuit provides a path for transmission of the short-wave signal, the direct-current signal and the control signal and carries out transient protection, and the output end of the three-signal circuit is connected with the II-stage transient protection circuit; and the II-stage transient protection circuit is a voltage clamping circuit consisting of a low-capacitance diode and a bidirectional transient suppression diode, and is used for protecting a high-frequency part in the lightning electromagnetic pulse or the nuclear power electromagnetic pulse and clamping the residual voltage at a relatively low level. The device can effectively protect thunder and lightning and nuclear power electromagnetic pulses, has the characteristics of small insertion loss, low residual voltage and the like, and can greatly improve the strong electromagnetic environment viability and anti-interference capability of a short-wave radio station.

The invention discloses a low-frequency load shedding cooperative control method, system and device based on GOOSE communication and a readable storage medium, and the method specifically comprises the steps: calling a topology analysis service to confirm that a home terminal is in a receiving end power grid, sending a state query request to an adjacent terminal, and receiving an action signal of the adjacent terminal through GOOSE communication; based on the dynamic load shedding sequence, executing load shedding operation; a marginal cost function of each terminal is calculated, distributed consensus verification is carried out in combination with a block chain technology, and then load shedding parameters are optimized, issued and updated; and after load shedding is completed, a fault section is positioned through residual voltage detection and direction discrimination, a personalized reconstruction scheme is generated by combining topology identification and fault type matching, and power supply of a non-fault section is recovered within a preset distance. According to the method, quick response, cooperative control, accurate load shedding, intelligent optimization and quick fault recovery of low-frequency load shedding are realized, and the frequency stability and the power supply reliability of a power system in a new energy high-proportion access scene are remarkably improved.

The invention provides a dynamic residual amplification circuit based on charge sampling, and relates to the technical field of integrated circuits, the dynamic residual amplification circuit comprises an integrating circuit, a logic circuit, a charge pump and a zero-cross detection circuit, the integrating circuit is connected with the logic circuit and the zero-cross detection circuit, the integrating circuit converts a sampled input differential signal into a constant current, and the constant current is connected with the charge pump. The output node is continuously charged or discharged, so that the input differential signal is converted into a current integral quantity; the zero-cross detection circuit monitors the output voltage of the integrating circuit in real time, and when the output voltage is greater than or equal to the common mode voltage VCM, the moment when the output voltage is equal to the common mode voltage VCM is converted into a digital clock edge; the logic circuit is connected with the charge pump and outputs digital pulses to the charge pump according to the digital clock edge so as to control the reset time sequence of the whole dynamic residual amplification circuit; the charge pump is configured to output a residual voltage modulated by the digital pulse in response to the digital pulse. The application helps to improve the linearity of the residual signal.

The embodiment of the invention provides a capacitor array calibration method, a controller, a medium and a product, which are applied to the technical field of analog-to-digital signal conversion and applied to a capacitor array calibration system, the system comprises a basic capacitor array, a plurality of temperature decoding capacitor arrays and an A / D conversion module, the method comprises the following steps: acquiring residual voltages of to-be-calibrated capacitors in a basic capacitor array and temperature decoding capacitor arrays; performing analog-to-digital conversion on each residual voltage through an A / D conversion module to obtain a digital code of each capacitor to be calibrated; through a preset mismatch code calculation formula, mismatch codes of the to-be-calibrated capacitors are obtained through calculation according to the digital codes; and calibrating the basic capacitor array and each temperature decoding capacitor array according to each mismatch code. According to the embodiment of the invention, the basic capacitor array and each temperature decoding capacitor array are calibrated through each mismatch code, so that the phenomenon of electric leakage of the capacitor arrays can be avoided, and the accuracy of the circuit is improved.

The application discloses a detection circuit used for short circuit detection of a power supply output port, comprising a short circuit detection circuit used for short circuit detection, a first port of the short circuit detection circuit is connected in series with a first auxiliary power supply circuit, a second port of the short circuit detection circuit is connected in parallel with the power supply output port, and a detection signal output by the short circuit detection circuit is input to a processor; the processor controls the power supply output port and the power supply to be in an isolated state in response to the power supply starting operation, and the detection current from the first auxiliary power supply circuit flows into the first end of the first port. Detection current flowing into the first end flows back to the first auxiliary power supply circuit through the second port, currently in the short circuit state, of the short circuit detection circuit and the second end in the first port of the short circuit detection circuit in sequence, so that the short circuit detection circuit outputs a first level signal used for representing existence of short circuit. According to the invention, short-circuit detection consumes less time, rapid residual voltage discharge can be realized, and damage to a power supply and internal components of a load is avoided.

The invention relates to the technical field of integrated circuit design, in particular to a noise shaping assembly line successive approximation type analog-to-digital converter and a control method. Comprising a first stage including an auxiliary successive approximation analog-to-digital converter and a first stage voltage processing module; the second stage comprises a dual-channel noise shaping successive approximation type analog-to-digital converter and a loop filter; the input end of the residual amplifier is connected with the first-stage voltage processing module, and the output end of the residual amplifier is connected with the noise shaping successive approximation type analog-to-digital converter; the first input end of the digital code aligner is connected with the output end of the comparator of the auxiliary analog-to-digital converter, and the second input end of the digital code aligner is connected with the output end of the second-stage comparator. According to the invention, the analog-to-digital conversion speed can be accelerated, the influence of a zero point on a residual voltage amplification coefficient is reduced, the conversion time is shortened, and the input and output common-mode voltages of the time domain converter are stabilized.

The invention discloses a relay state detection circuit and method, and the circuit comprises a battery pack, a plurality of relays, a plurality of diagnosis circuits, a first resistor and a first capacitor, the positive electrode of the battery pack is connected with one end of a first main relay, and the negative electrode of the battery pack is connected with one end of a second main relay; one ends of the first diagnosis circuit, the first charging relay, the first resistor and the first capacitor are respectively connected with the other end of the first main relay; one end of the second charging relay, the first diagnosis circuit, the first resistor and the other end of the first capacitor are respectively connected with the other end of the second main relay; the other end of the first charging relay is connected with the third diagnosis circuit and the positive electrode of the charging interface. The other end of the second charging relay is connected with the fourth diagnosis circuit and the negative electrode of the charging interface. According to the method, the state judgment of the charging positive relay and the charging negative relay is realized by utilizing the residual voltage of the discharging loop of the whole vehicle load capacitor.

The invention belongs to the technical field of safety and stability of a power system, and relates to a coordinated operation method and system of a distributed phase modifier and a network-forming SVG (Static Var Generator). According to the invention, by obtaining the current-limiting critical voltage coefficient and the equivalent critical voltage coefficient, the cooperative operation effect of the distributed phase modifier and the network-forming SVG and the supporting capability of the system voltage support are improved; when the residual voltage coefficient is smaller than the equivalent critical voltage coefficient, the reactive power supporting capacity provided by the phase modifier is high, the phase modifier is smoothly put into operation, and the impact on the system caused by the put-in of the phase modifier is reduced; when the residual voltage coefficient is greater than the equivalent critical voltage coefficient, the phase modifier starts to smoothly exit from operation, and the impact on the system caused by the deduction of the phase modifier is reduced; and when the residual voltage coefficient is greater than the current-limiting critical voltage coefficient, the networking SVG quits the current-limiting link, the phase modifier completely quits operation, and the margin of transient reactive power regulation of the system is improved. According to the invention, safe and effective cooperative work of the network-forming SVG and the distributed phase modifier is realized.

The invention discloses an anti-backflash LED drive circuit which comprises a power supply module, a drive control circuit, a starting circuit and an auxiliary power supply circuit. The power supply module converts an input voltage into a bus voltage; the driving control circuit adjusts the duty ratio of a field effect switch tube through a first control chip, and LED constant-voltage and constant-current output is achieved. The starting circuit adopts a negative-voltage turn-off device, and is switched on to supply power to the control chip during initial power-on; the auxiliary power supply circuit inductively generates alternating voltage through an auxiliary winding coupled by a power inductor, continuously supplies power to the control chip after rectification and filtering, triggers the negative voltage turn-off device to be turned off, and cuts off a power supply path of the starting circuit; after power failure, the negative-voltage turn-off device is maintained in a turn-off state, backward flowing of residual voltage of a bus is blocked, the inductor stops oscillation to stop auxiliary power supply, power supply of the control chip returns to zero along with discharging of the capacitor, and LED back flash is eliminated through double mechanisms. According to the invention, the technical problem of LED power-off flashing back in the prior art is solved.

The invention discloses a method and a device for detecting a high-resistance grounding fault of a power distribution network. The method comprises the following steps of: acquiring residual current measured by an annular current transformer mounted in a transformer substation, residual voltage along a feeder line and a V2 / V1 ratio at the downstream of a high-resistance grounding fault test point; and detecting the high-resistance grounding fault of the power distribution network according to the residual current, the residual voltage, the V2 / V1 ratio and a preset high-resistance grounding fault detection rule. According to the invention, the efficiency of high-resistance grounding fault detection can be improved.

The embodiment of the invention relates to a power supply wake-up circuit and a vehicle-mounted power supply management system, and the power supply wake-up circuit is provided with a power supply module, a reference module, a detection trigger module and an operational amplifier processing module, a wake-up signal is generated according to the ratio of a detection voltage to a reference voltage, and the power supply module is controlled to wake up according to the wake-up signal. Meanwhile, the reference voltage larger than the wake-up threshold of the power supply chip is configured to perform specific value judgment on the detection voltage to generate the wake-up signal, so that the residual voltage interference is effectively eliminated, the wake-up reliability is improved, and the problem of power shortage of the battery caused by false triggering is avoided.

The invention relates to the field of circuit breakers, and provides a circuit breaker which comprises an insulating shell and a pull rod mechanism, a power connection end is arranged on the side face of the insulating shell, the circuit breaker further comprises a first capacitor and a second capacitor, and the first capacitor is arranged in the insulating shell and electrically connected with a first conductive metal body of the power connection end; the second capacitor is arranged in the insulating shell, a second conductive metal body electrically connected with the second capacitor is arranged at the end part of a moving contact of the vacuum arc-extinguishing chamber of the insulating shell, and a first interface and a second interface are arranged on the side wall or the end part of the insulating shell. The circuit breaker is connected for use, and the power connection end is connected with external detection or feedback equipment, so that the working state of the circuit breaker is monitored and fed back in real time. When the circuit breaker is disconnected, the first capacitor and the second capacitor can be used for detection so as to determine whether the interior of the circuit breaker is completely powered off, that is, no residual voltage exists on the power connection end and the moving contact part, so that safe and reliable operation is ensured.

The invention relates to the technical field of multi-column lightning arresters, in particular to a multi-column lightning arrester parallel matching method, which comprises the following steps of S1, performing aging screening and energy tolerance testing on zinc oxide resistor discs of the same batch; s2, measuring the direct-current reference voltage Uref of the resistor discs, the leakage current I0 under 0.75 Uref, the impact residual voltage UL under the lightning wave and the operation residual voltage US under the operation wave one by one; s3, screening the resistor discs for three times; and S4, high-low matching is carried out by taking the operation residual voltage US as a main matching basis, so that the operation residual voltage deviation of each column of series resistor disc group is smaller than a first preset value, and the direct current reference voltage numerical value deviation is smaller than a second preset value. The strict screening process ensures the consistency of the performance of the resistor discs, and the reasonable grouping mode makes the electrical performance of each column resistor disc group more balanced, thereby achieving the effect of improving the operating wave endurance capability and the current sharing characteristic of the multi-column lightning arrester, and reducing the probability of faults caused by uneven current distribution of the MOV.

The invention relates to the technical field of power fault detection, and mainly relates to a residual voltage detection circuit and a line protection device.The residual voltage detection circuit comprises a sampling circuit and a signal holding circuit, the signal holding circuit adopts double coils and comprises a first coil and a second coil, and a loop where the first coil is located is provided with a first controllable switch tube in series; the first controllable switch tube is connected when the sampling circuit collects residual voltage, a second controllable switch tube is arranged in a loop where the second coil is located in series, the control end of the second controllable switch tube is used for being connected with a feeder terminal, and the signal holding circuit further comprises a residual voltage output branch used for being connected with the feeder terminal. The residual voltage output branch is provided with a first contact of the double coils in series. A sampling circuit is used for obtaining a residual voltage signal generated at the moment of closing of a faulty power grid line, and a signal holding circuit formed by double coils is used for transmitting a sampling signal to a feeder terminal, so that the feeder terminal can still receive the residual voltage signal when the feeder terminal loses power after power supply is recovered.

The invention relates to an intelligent power supply switching method suitable for a power station, and aims at solving the problems that an existing spare power automatic switching device is low in response speed, single in starting condition, incomplete in switching-on logic and the like. According to the invention, parameters such as voltage, frequency, phase and current of the power supply are monitored in real time, and various switching logics such as rapid closing, synchronous capture closing, residual voltage closing and long delay closing are combined, so that rapid and safe switching between the main power supply and the standby power supply is realized. The system supports various triggering modes such as manual starting, protection starting, voltage loss starting, reverse power starting and non-current starting, and can adapt to complex scenes such as single-bus segmentation, single-bus and isolated network operation. Through an embedded hardware platform, a DSP + ARM + CPLD architecture is adopted, the system has efficient data acquisition and logic operation capability, and the switching time can be shortened to be within 10 milliseconds. Meanwhile, multiple safety mechanisms such as overcurrent protection, reverse power protection and decoupling protection are provided, and misoperation and parallel operation risks in the switching process are avoided.

The invention discloses a multi-electric-level straight drive circuit of a depletion type switching device, which is characterized in that by dynamically switching positive voltage, zero voltage and deep and shallow negative voltage, the positive voltage is utilized to reduce on resistance in a conduction stage, the deep negative voltage is utilized to quickly cut off current in a turn-off stage, and then the shallow negative voltage is switched to maintain a turn-off state, so that the static power consumption is remarkably reduced. A surge suppression circuit and a power driver work cooperatively, surge current is suppressed through a current-limiting resistor and a fast bypass switch at the moment of starting, and a short circuit Ra is formed after negative voltage is established to reduce loss; and before power failure, the capacitor stored energy is released through the active discharge switch, so that mistaken switching-on caused by residual voltage is eliminated. Through system-level innovation, the direct connection problem of a depletion type device is effectively solved, and a high-efficiency, reliable and compact solution is provided for a high-power-density power supply system.

The invention discloses a system for simultaneously measuring residual voltage and discharge capacitance of an electric appliance plug. The system comprises a phase detection unit, a measurement control unit, an electronic disconnection unit and a multi-input impedance measurement unit. According to the system, a conventional residual voltage test is carried out once, plug discharge voltage curves at different moments can be obtained by using the high-impedance measurement unit and the low-impedance measurement unit, discharge time constants during high-impedance measurement and low-impedance measurement are respectively calculated through curve fitting, the optimal estimated values of discharge capacitance and discharge resistance are obtained, and the test accuracy is improved. And reversely calculating whether the action of the electronic circuit participates in the discharge process after the peak value is switched off, thereby achieving a primary electric appliance plug discharge test and obtaining three measurement parameters. Therefore, the system disclosed by the invention can be used for conformity judgment on whether the charged capacitor on the plug pin of the electrical product can cause the electric shock danger, and has the characteristics of accurate test, simple operation and the like.

The invention discloses a multi-physics field coupling high-resistance fault self-healing protection method, equipment and a medium. The method comprises the following steps: collecting multi-physics field coupling data and carrying out standardization processing; a multi-field coupling robust threshold value is generated based on the standardized multi-field coupling data, and the fault condition is further identified and judged; analyzing a fault condition based on a digital twinborn technology, inverting fault point data and performing multi-field cooperative adaptive arc extinction control; and self-healing recovery of robust optimization driving is carried out. According to the method, the dynamic protection threshold value is generated through a method of fusing time sequence prediction and robust optimization, wide-range fluctuation of new energy output and load can be automatically adapted, the problem that the misjudgment rate of a fixed threshold value is high when the system operation state changes is solved, and the dynamic adaptability of protection is improved; a model prediction control dynamic optimization active compensation strategy is adopted, the residual voltage and the residual current of a fault point can be actively restrained within a preset safety threshold value, and secondary accidents such as electric shock and mountain fire caused by incomplete arc extinction are avoided.

The invention discloses a hydropower station unit residual voltage frequency measurement module implementation method, which relates to the technical field of power systems, and comprises the steps of residual voltage acquisition and preprocessing, signal filtering and amplification, signal shaping and isolation, zero-crossing capture, unit residual voltage acquisition by utilizing a PT preceding-stage loop and conversion into a low-voltage signal, signal filtering and amplification, and zero-crossing frequency measurement. Interference is removed through a secondary filtering and amplifying circuit, higher harmonics and alternating current components are filtered out, the signal amplitude and stability are improved, the amplitude, type and level of the signal are processed by means of a forward series diode and an optocoupler, and an ADC sampling signal is output for residual voltage amplitude detection. And after being amplified and filtered by an operational amplifier, the signal zero-crossing moment is detected by a voltage comparator in combination with a counter so as to calculate the frequency, so that high-precision measurement of the residual voltage amplitude and frequency of the hydropower station unit is realized, and key data support is provided for stable operation and control of the unit.

The invention discloses a direct-current power transmission system EM lightning arrester zinc oxide resistor disc selecting and balancing method, and belongs to the technical field of lightning arrester disc selecting and matching. The disc selecting method comprises the steps that S1, direct-current parameter testing is carried out, and damped and aged resistor discs are removed based on the direct-current parameter testing result; s2, applying lightning and operation impact to the resistor discs, measuring residual voltage, calculating a voltage ratio based on the residual voltage, and rejecting the resistor discs of which the voltage ratio deviation is not within a set voltage ratio threshold range; s3, carrying out square wave energy testing on the resistor discs, and removing the damaged resistor discs in the testing process; s4, performing long-wave residual voltage test on the resistor discs one by one by using the test square wave, recording a long-wave residual voltage value obtained by the test, and removing the resistor discs which are subjected to breakdown, flashover and aluminum surface burning in the test; calculating long-wave residual voltage deviation of the resistor discs under square wave excitation, and removing the resistor discs with the long-wave residual voltage deviation exceeding a set long-wave residual voltage deviation threshold value; and the sheet selection scheme of the EM lightning arrester is perfected, and the accident rate is reduced.

The invention belongs to the technical field of analog-to-digital converters, and particularly relates to a Pipeline SAR ADC background digital calibration method, which comprises the following steps: in a first-stage sub-ADC sampling stage, sampling an analog input signal by adopting a capacitor lower-stage board of a first-stage capacitor array; after the sampling is finished, the first-stage SAR ADC performs SAR conversion; obtaining a corresponding residual voltage and a pseudo-random PN sequence after SAR conversion; the residual voltage and the generated pseudo-random PN sequence are input into the amplifier, the output of the amplifier is obtained and serves as a second-stage input signal for sampling, and in the same way, each sub-ADC can generate a digital code; and inputting the digital codes output by all the sub-ADCs into a digital calibration module for digital calibration, and finally obtaining an output result. Compared with the traditional digital calibration technology, the method has the advantages that the non-linear error calibration is added, the convergence speed is increased, the calibration precision is improved, and the ADC performance is improved.

The invention discloses a cable branch box power supply system and a method thereof, the cable branch box power supply system comprises a three-section surge protection device, an integrated trigger type discharge gap unit, an MOV clamping unit and a residual voltage shaping network, and is cooperated with a follow-up cut-off mechanism to inhibit surge and optimize residual voltage in stages, cut off current at a voltage zero point when the surge is attenuated and a power frequency current exists, and improve the reliability of the power supply system. Electric arc and operation overvoltage are reduced; the on-line health diagnosis module analyzes the deterioration trend of a key element through equivalent parameter injection measurement and an NTC temperature probe, and uploads data through an RS-485 / Modbus bus; the dynamic load distribution module adjusts branch current in real time; the intelligent cooperative control module integrates multiple modules to realize self-adaptive linkage; the fault isolation unit is linked with the follow-up cutoff mechanism, and triggers cutoff and sends an opening signal to an upper level when the fault isolation unit is abnormal; and the event recording module is used for storing related data and supporting USB on-site calling. According to the invention, the surge resistance, the cutoff reliability and the operation stability of the system are enhanced, and the preventive maintenance capability is improved.

Methods and systems for improving fusion bonding are disclosed. Plasma treatment is performed on a substrate prior to the fusion bonding, which leaves residual charge on the substrate to be fusion bonded. The residual charge is usually dissipated through an electrically conductive silicone cushion on a loading pin. In the methods, the amount of residual voltage on a test silicon wafer is measured. If the residual voltage is too high, this indicates the usable lifetime of the silicone cushion has passed, and the electrically conductive silicone cushion is replaced. This ensures the continued dissipation of residual charge during use in production, improving the quality of fusion bonds between substrates.

Provided are a switching method and system for a motor (170) of a circulating water pump (152) of a nuclear power plant. The method (300) comprises: on the basis of a change of electromagnetic field energy conducted by a first predetermined conductor on an input side of a motor (170) of a circulating water pump (152), determining whether to generate a switching command for the motor (170) (S302); in response to detecting a generated switching command, acquiring a voltage or current waveform of the motor (170) side and a voltage or current waveform of a grid (162) side, the voltage of the motor (170) side being a superposed voltage of a residual voltage of the motor (170) and an induced electromotive force generated by the motor (170) (S304); at least on the basis of comparison between the voltage waveform of the motor (170) side and the voltage waveform of the grid (162) side, determining an action time of the switching command (S306); and, in response to the determined action time being reached, switching to direct power supply from the grid (162) to the motor (170) (S310). Thus, the present invention can accurately determine a time for performing electrical switching on the motor (170) of the circulating water pump (152), thus significantly improving the success rate of switching.

The invention discloses a composite oscillation type direct-current circuit breaker, and belongs to the technical field of direct-current power transmission. Comprising a main through-current branch, an active oscillation switch circuit, a passive oscillation switch circuit, an inductance-capacitance series oscillation branch and an energy consumption branch. The passive oscillation switch circuit is connected in parallel with the high arc voltage combination switch in the main through-current branch; an active oscillation branch circuit formed after the active oscillation switch circuit is sequentially connected in series with an oscillation capacitor and an oscillation inductor is connected in parallel with the main through-flow branch circuit; and the energy consumption branch is connected with the main through-flow branch in parallel. Therefore, compared with a single oscillation mode, the current zero crossing point is generated by utilizing a multi-oscillation mode, so that the capacitance value of the oscillation capacitor is greatly reduced; a controllable energy consumption mode is utilized, and a main lightning arrester with lower reference voltage and residual voltage can be adopted in the design, so that the maximum turn-off overvoltage at the two ends of the circuit breaker is reduced, and the withstand voltage value of an oscillation capacitor, the series number of vacuum switches and the stress level of the vacuum switches are reduced. The cost is reduced, the economy is improved, and the stability of the turn-off capability is ensured.

The invention provides a power converter, and belongs to the technical field of power electronics. In the scheme provided by the invention, the lightning protection unit in the power converter comprises a piezoresistor and a gas discharge tube which are connected in series. Therefore, the action voltage of the lightning protection unit can be effectively increased on the premise that the action voltage of the piezoresistor is not increased, and it is ensured that the lightning protection unit can be suitable for the high-voltage power converter. Moreover, by connecting the divider resistor in parallel with the gas discharge tube, flexible voltage division of the piezoresistor and the gas discharge tube can be realized, so that the model selection flexibility of the piezoresistor and the gas discharge tube is effectively improved. Besides, in a lightning stroke scene, the voltage at the two ends of the gas discharge tube after action is relatively low, and the residual voltage of the lightning protection unit can be prevented from being increased, so that the requirement on the protection performance of each power device in the power converter can be prevented from being increased.

The invention relates to the technical field of ion fan testing, in particular to an analysis processing method and system for ion fan testing data. The method comprises the following steps: acquiring voltage data in a test period, extracting a rapid drop characteristic and a slow attenuation characteristic in electrostatic response data, and respectively generating a first electrostatic discharge characteristic and a second electrostatic discharge characteristic; identifying a corresponding discharge response section according to the difference; a response curve form in the section is extracted, and first neutralization time, first residual voltage, second neutralization time, second residual voltage and other electricity removal performance parameters are obtained; if the neutralization time difference and the residual voltage are both within the set threshold range, it is judged that the fan is in a stable electricity removal state, and blowing output is maintained; otherwise, it is judged that the electricity removal performance is abnormal, testing is stopped immediately, output is locked, and an alarm and data reporting mechanism is triggered; according to the invention, through ion fan testing, ion fan testing is more accurate.

The utility model discloses a control system for residual voltage during rapid power-on and power-off of terminal equipment, which comprises a power supply module, an MCU (Microprogrammed Control Unit) main control module, a power switch control circuit, a residual voltage processing circuit, an anti-backflow circuit and a communication module, and is characterized in that the MCU main control module is respectively connected with the power switch control circuit and the residual voltage processing circuit; the power switch control circuit is respectively connected with the power supply module and the anti-backflow circuit, and the communication module is respectively connected with the anti-backflow circuit and the residual voltage processing circuit. According to the utility model, the communication module can be prevented from working abnormally and being damaged permanently under the conditions that the terminal equipment is powered off in an abnormal condition and the communication module needs to be switched on and off repeatedly, and the reliability of long-term communication work of the low-power-consumption terminal equipment is ensured.

The application provides a voltage converter. The voltage converter comprises a primary circuit, a secondary circuit and a discharge control unit. The secondary circuit comprises a first MOS tube and an output capacitor. The first MOS tube is connected with the discharge control unit. The discharge control unit is used for controlling the first MOS tube to work in a linear region when the voltage converter is in a shutdown state or an abnormal protection state. In the technical scheme, after the voltage converter stops working, the first MOS tube is controlled to work in the linear region, so that the first MOS tube consumes the residual voltage on the output capacitor in the voltage converter as a resistance. In this way, when the voltage converter is started, the pre-bias voltage is reduced or disappears, so that an excessively large reverse current is avoided, and thus the failure of components in the voltage converter is avoided.