1291 results about "Inrush current" patented technology

The embodiment of the invention provides a closed-loop control method for power driving and protection, and the method comprises the steps: constructing a voltage feedback type circuit through a high-speed operational amplifier, and forming a closed-loop gain structure through a feedback network of the voltage feedback type circuit; the load current of the output end of the voltage feedback type circuit is monitored in real time, and when the load current exceeds a first set threshold value, a protection mechanism is triggered to turn off the output stage; the power-on surge current is limited through the soft start control circuit; phase information of a load reflection coefficient is obtained, an inductance / capacitance combination of the variable dynamic impedance matching network is selected according to phase information table look-up, inductance / capacitance parameters are switched through a relay, and the transmission standing-wave ratio between the power amplifier and a load is optimized; monitoring the temperature of the radiating fin of the power tube, and dynamically adjusting the resistance value of the feedback network; and performing cooperative control of short-circuit protection, over-temperature protection and surge suppression according to the priority. According to the embodiment of the invention, the performance bottleneck in a load fluctuation scene is broken through.

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 an operation control method of a low-power-consumption off-grid inverter, electronic equipment and a storage medium, and the operation control method comprises the steps: maintaining an output switch to be in a closed state when the output current of an AC output port is detected to be greater than or equal to a first preset current threshold value under the condition that the off-grid inverter is in a no-load low-power-consumption mode, the inverter side is controlled to close driving, and the driving duty ratio of the LLC low-voltage side is adjusted to be a first preset duty ratio, so that the voltage of the bus capacitor is increased to be a preset steady-state voltage; and when it is detected that the voltage of the bus capacitor reaches the preset steady-state voltage, the inverter side is controlled to start driving. According to the low-power-consumption off-grid inverter, the output switch is kept in the closed state, the inverter side is controlled to close driving, and the driving duty ratio of the LLC low-voltage side is correspondingly adjusted, so that the impact current input by the LLC low-voltage side is reduced, the capacitor voltage stress of the LLC high-voltage side and the stress of a power device of the low-voltage side are reduced, and the reliability of the low-power-consumption off-grid inverter can be remarkably improved.

A powered device (PD) interface controller is provided that includes a switch and control circuitry. The switch controls current to a PD from a power sourcing equipment (PSE). The PD accepts power from a network cable over which data is carried, and the PSE provides the power to the network cable. The PD also accepts power from an auxiliary power source. The control circuitry detects a change-over from the auxiliary power source to the PSE as a source of power. The control circuitry turns on the switch to control the current to a short circuit current limit level, greater than a startup inrush current limit of the PD, for a period of time less than a short circuit time limit, to charge a bulk capacitor of the PD. The control circuitry turns on the switch fully to allow the current to flow towards the PD.

The invention discloses a transformer inrush current identification and early warning integrated method based on multi-sensor fusion, and relates to the technical field of transformer equipment, and the method comprises the following steps: S1, carrying out the distributed deployment of multiple sensors and the construction of a self-adaptive sensing network; s2, performing multi-dimensional feature correction and time alignment; s3, fuzzy characteristics are extracted, and a complex nonlinear relation in the operation state of the transformer is captured; s4, fusing the data after the fuzzy characteristics are extracted; s5, constructing an inrush current identification model, and carrying out the precise identification of the inrush current of the transformer; and S6, carrying out real-time early warning. According to the transformer inrush current identification and early warning integrated method based on multi-sensor fusion, dynamic extraction and deep learning modeling of multi-modal features are realized by introducing a distributed multi-sensor fusion technology, and real-time dynamic threshold calculation, reinforcement learning optimization and Bayesian fault probability inference are combined, so that the transformer inrush current identification and early warning integrated method is realized. And integration of inrush current identification and early warning of the transformer is realized.

According to the heterogeneous multi-core chip power consumption state control system and the heterogeneous multi-core chip provided by the invention, the power consumption state request of each sub power supply domain is received through the set system hardware power consumption management module, and the driving signal is sent to the corresponding sub power supply domain according to the preset hardware time sequence, so that the corresponding sub power supply domain enters the target state; generating a PMU control signal; and the power management module drives an internal voltage regulator to execute corresponding regulation operation according to the PMU control signal. A special control processor (SCP) is not needed, the system hardware power consumption management module realized by pure hardware is adopted to directly control the power consumption state of each sub power supply domain in the heterogeneous multi-core SoC, the software processing delay is eliminated, the response speed is high, the static power consumption of the power consumption management module is remarkably reduced, and the system is particularly suitable for an ultra-low power consumption scene and has a wide application prospect. And hardware-level surge current protection is realized in a multi-core power-on process.

The invention discloses a SiC MOSFET maximum surge current test and failure analysis method and device based on three-terminal resistance monitoring. The performance change of the device under the extreme stress is quickly evaluated by applying the stepping surge current and combining the online monitoring of the three-terminal resistor, so that the maximum single surge current bearing capacity and the failure mode of the device are judged. The method comprises the following specific steps: applying proper grid bias voltage to a SiC MOSFET to be tested, and setting parameters of a surge current generating circuit; and after the stepping single surge current is applied, measuring and recording three-terminal static resistance values of the gate-source terminal, the drain-source terminal and the gate-drain terminal. By monitoring the change of the resistance value, the maximum single surge current is determined, the failure mode of the device is judged, and the modes of open circuit, short circuit, electric leakage, burning and the like are determined. The method is easy and convenient to operate and low in cost, and reliability information of the SiC MOSFET can be rapidly provided under the condition that a high-precision instrument is not used.

The invention relates to the technical field of transformers, in particular to an intelligent excitation surge current identification method based on machine learning, which comprises the following steps of: firstly, constructing a simulation model of a high-impedance transformer, and optimizing the model so that the model can output an oscillogram of excitation surge current according with an experimental result according to specified input parameters; a simulation experiment is carried out on the basis, so that the difficulty and the time cost of a manual experiment are greatly reduced; processing and analyzing the data of the simulation experiment to obtain a feature vector; deep learning is carried out on the feature vectors to find the relation between the feature vectors of different parameters; and finally, decision-level fusion is carried out on the multi-modal data set, each parameter independently obtains a decision result and then is fused together, and a final waveform result is output according to positive and negative correlation gains. The prediction and identification of the excitation inrush current are realized; and a basis is provided for suppression of excitation inrush current.

The invention provides a power supply device, a power supply control device and a control method thereof, the power supply control device is electrically connected to a power supply, and the power supply is used for supplying power to a post-stage circuit of the power supply control device. The power supply control device comprises a current limiting module and a control unit. The current-limiting module is electrically connected to the power supply and the post-stage circuit and comprises a first current-limiting unit and a second current-limiting unit which are connected in parallel, the first current-limiting unit is configured to limit a surge current generated when the post-stage circuit is started, and the second current-limiting unit is configured to limit a surge current generated when the power supply is abnormal. The control unit is electrically connected to the current limiting module and is configured to control the first current limiting unit and the second current limiting unit.

A system for providing inrush current limiting for induction motor starting. The system utilizes a pre-start controller to initialize operation of a controller including multiple switches for controlling the voltage delivered to a motor having multiple phases. The pre-start controller activates each switch and determines whether a phase current flowing through the switches satisfies a threshold current. The switches are deactivated a phase current satisfies the threshold current. The pre-start controller determines an activation order for each phase and orders phases having higher phase currents higher in the order than lower phase currents, and determines an activation timing. Based on whether the highest phase current is positive or negative, the pre-start controller then activates, using a voltage at a corresponding angle and based on the activation order and activation timing, the phases to de-saturate the flux generated by the phase currents, thereby limiting an inrush current provided to the motor.

A current control module is for controlling an in-rush current resulting from the initiation of an electrical connection of a battery to an electrical load, wherein a metal-oxide-semiconductor field-e

Inrush current in a memory such as SRAM cache may be managed by using one or more integrated delay elements such as inverters, RC delay lines, and the like to significantly slow down power down signal propagation between memory instances in a memory array. The delay in some examples may be between memory instances, while in other examples the delay is also introduced between bitcell arrays within a memory instance. By staggering the power up times of interconnected or chained memory instances, inrush current when powering the memory instances on or resuming from an inactive state may be reduced.

The grid connection method is suitable for the field of connection of a low-voltage load independent power supply system into a medium-voltage power grid, and is an independent power supply system grid connection method which can give consideration to important load uninterrupted power supply and transformer starting inrush current suppression at the same time. Considering that the capacity of an energy storage battery is limited and power supply of all loads is difficult to support, the loads are divided into sensitive loads and general loads, and when a main network loses power, the energy storage battery supplies power to important loads through a hybrid transformer; in the reclosing grid connection process, the starting inrush current and time of the transformer are effectively reduced through voltage and current multi-control mode switching of a converter in the hybrid transformer device, and meanwhile uninterrupted power supply of an important load is guaranteed; and after the grid-connected starting of the passive transformer is completed, the medium-voltage power grid is switched to supply power, and a general load at a low-voltage side is put into use. According to the method, the problem that the sensitive load needs secondary power failure after the power grid loses power in a traditional power supply mode is solved, the service life of the passive transformer is effectively prolonged, and the working efficiency of the low-voltage important load is effectively improved.

The invention relates to the technical field of transformer excitation inrush current suppression, in particular to a high-impedance transformer excitation inrush current suppression method and system, and the system comprises a data collection module, a data preprocessing module, a calculation module, a main control module, an output module and an execution module. The method comprises the following steps: firstly, establishing a finite element model based on hysteresis characteristics, and collecting real operation data of a transformer and taking the real operation data as input to train the finite element model; continuously optimizing the model, and performing a simulation experiment by using the optimized finite element model to obtain simulation experiment data so as to construct a data set R, thereby greatly reducing the labor capacity of a manual experiment and quickly obtaining a large amount of simulation data; feature extraction and deep learning are carried out based on a neural network model, so that a prediction model about the excitation surge current is trained; then actual operation data of the transformer are collected, and the magnetizing inrush current is predicted by using the prediction model; and a proper closing angle or opening angle is selected to control the operation of the transformer, so that the purpose of reducing excitation inrush current is achieved.

The invention discloses a power distribution network island grid-connected smooth switching control method and system, belongs to the field of power distribution networks, and particularly relates to power distribution system control, and the method comprises the steps: carrying out the feature extraction of a first voltage signal at the island side of a power distribution network and a second voltage signal at the main network side of the power distribution network, and obtaining a quantitative feature value; inputting the quantized characteristic value into an inrush current prediction model to output a closing inrush current prediction range, calculating a width value and a peak amplitude of the prediction range corresponding to each phase time sequence to identify a target phase interval, and evaluating stability contribution of each phase time sequence in the target phase interval to determine a target closing time sequence; and adjusting the output characteristic parameters of the inverter according to the target closing time sequence to obtain an inverter output signal, performing iterative optimization to adjust phase difference compensation, and generating a grid-connected control instruction to control grid-connected smooth switching of the power distribution network island, so that smooth switching during grid connection of the power distribution network island and the main network can be realized, and the stability of the power distribution system is improved.

The invention discloses a power type negative temperature coefficient thermistor and method for suppressing surge current, and relates to the technical field of negative temperature coefficient thermistors, the thermistor comprises a core body and pins, the pins are respectively arranged on electrodes on two sides of the core body by adopting a multi-contact-surface structure, and the pins are arranged on the two sides of the core body. The core body is made of a Mn-Co-Ni-La oxide with a nano composite gradient structure; the Mn-Co-Ni-La oxide with the nano-composite gradient structure determines the upper limits of core capabilities such as surge suppression, wide temperature stability and low power consumption of the thermistor, and the redesign of the pin is the key of performance transfer, so that the electrical properties (low contact resistance and high surge tolerance) of the Mn-Co-Ni-La oxide with the nano-composite gradient structure are not counteracted by structural defects; the arrangement of the bracket prevents the Mn-Co-Ni-La oxide with the nano-composite gradient structure from losing the effect due to heat accumulation and physical damage through thermal management and mechanical protection, and the three components supplement one another and cooperate with one another, so that the performance of the thermistor of the Mn-Co-Ni-La oxide with the nano-composite gradient structure is guaranteed.

The invention belongs to the technical field of power transformation equipment, and particularly relates to a low-voltage dynamic reactive compensation switching device which comprises a shell, a photoelectric isolation module and a communication module. The shell is in an inverted-T shape, a switching switch is arranged at the front end of the shell, wiring ports are symmetrically formed in the upper side and the lower side of the shell, and wiring bolts are installed on the wiring ports. A photoelectric isolation module is arranged on one side of the shell, and the heat dissipation holes dissipate heat for the photoelectric isolation module. According to the scheme, a thyristor and contactor hybrid switching switch is adopted, zero-crossing switching is realized by the thyristor during dynamic load fluctuation, and inrush current control is less than or equal to 10 times of rated current. And when the static state is stable, the contactor is automatically switched to be conducted, and the power consumption is reduced to 1.5 W and is greatly reduced compared with a pure thyristor scheme, so that the impact is avoided and the energy consumption is reduced. The thyristors are in bidirectional anti-parallel connection, and are matched with zero-cross detection logic of the controller, so that overvoltage and transient harmonic waves in the switching process are thoroughly eliminated, no interference is caused to a power grid, and the service life of the device and power grid equipment is prolonged.

The utility model discloses a soft start system based on excitation current reduction, which is characterized in that a time relay mainly controls the switching of a live wire between a power resistor and an alternating current contactor, the power resistor magnetizes a transformer at the moment of electrification, and the alternating current contactor is connected into a circuit by the time relay after the magnetization is completed; and after the power resistor is short-circuited, the circuit is cut out, so that the purpose of suppressing the excitation inrush current is finally achieved, the excitation effect caused by voltage abrupt change at the power-on moment of the isolation transformer can be avoided, and the excitation abrupt change of the isolation transformer during power-on is effectively reduced.

The utility model provides a pre-charging circuit and an energy storage power supply. The pre-charging circuit comprises a constant current driving module, a pre-charging switch module, a power supply switch module and a voltage conversion module; the constant current driving module is respectively connected with the pre-charging switch module and the photovoltaic power supply, the pre-charging switch module is also connected with the voltage conversion module, and the power supply switch module is respectively connected with the photovoltaic power supply and the voltage conversion module; the constant-current driving module is used for outputting a constant-current signal when the input voltage of the photovoltaic power supply is greater than or equal to a first preset voltage so as to drive the pre-charging switch module to work, so that the photovoltaic power supply pre-charges a capacitor in the voltage conversion module through the pre-charging switch module; the power supply switch module is used for conducting when the voltage of the capacitor is greater than a preset value, so that the photovoltaic power supply supplies power to the voltage conversion module through the power supply switch module. According to the circuit, the surge current at the initial stage of capacitor charging can be reduced, meanwhile, smooth transition from pre-charging to normal power supply can be achieved, and the safety and stability of the circuit are improved.

The invention discloses a circuit breaker phase selection opening and closing device and method, and relates to the field of phase selection control. According to the scheme, a phase selection control system, an opening device and a closing device are additionally arranged on a high-voltage transmission line of an original railway vehicle, and the phase selection control system adopts a phase selection opening and closing technology to control closing and opening of the opening device and the closing device; in addition, when the phase selection control system breaks down, the closing device is in a closed state and transmits an opening and closing instruction to a coil of the vacuum circuit breaker, so that the vacuum circuit breaker carries out corresponding opening and closing according to the opening and closing instruction. According to the scheme, the problems of closing inrush current and opening overvoltage of the vacuum circuit breaker are effectively avoided through a phase selection opening and closing technology when the phase selection control system does not have a fault, and the vacuum circuit breaker can be enabled to perform corresponding opening and closing according to an existing mode, namely according to an opening and closing instruction, when the phase selection control system has a fault; and the reliability of the scheme is greatly improved.

The embodiment of the invention discloses a power distribution network intelligent grounding inrush current suppression method and device, and the method comprises the steps: collecting the state data of a power distribution network, and generating a line state data set, the state data comprising real-time load characteristics and impedance parameters; analyzing the line state data set based on an edge calculation model, and predicting an inrush current peak value and a waveform characteristic of the inrush current peak value at the grounding moment in combination with a nonlinear load fluctuation characteristic caused by the access of a distributed power supply; a particle swarm optimization model is constructed according to the predicted inrush current peak value, waveform characteristics and load characteristics, a search space is constrained through a local heuristic rule, capacitance and resistance parameters of an RC damping loop are dynamically adjusted, and an optimal damping scheme is generated; on the basis of inter-phase cooperative control logic of a three-phase system, dynamically determining grounding trigger time sequences of all phases in combination with the predicted inrush current waveform characteristics; and a grounding instruction is sent to the three-station integrated mechanism, and the three-station integrated mechanism executes an inrush current suppression operation. According to the invention, efficient inrush current suppression is realized.

Circuits and methods that limit current through power FETs of power converter to reduce damaging current in-rush events, independent of switching frequency, device mismatches, and PVT variations. Embodiments utilize a closed-loop feedback circuit and / or a calibrated compensation circuit to regulate, substantially independent of frequency, the control voltage VGATE applied to a power FET gate. In a reduced gate-drive mode, connecting a feedback or compensation circuit to the gate of an LDO source-follower FET allows the gate voltage to be regulated to control the LDO output voltage to a final inverter coupled to the gate of a power FET so that VGATE is adjusted to provide a reduced gate-drive to the power FET; connecting to the output of the LDO allows the LDO output voltage to the final inverter to be directly regulated to adjust VGATE; connecting to the gate of the power FET allows VGATE to be directly set.

The invention discloses a magnetizing inrush current suppression method and system during closing of a distribution transformer. The method comprises the following steps: acquiring three-phase voltage and current waveform data before and after tripping of a primary side circuit breaker of the distribution transformer; measuring and calculating the residual magnetism of the primary side winding according to the voltage and current data, and determining a closing phase sequence by the minimum residual magnetism in order to avoid dispersive errors of the circuit breaker; determining the specific closing time of the transformer according to the residual magnetism information; only the voltage and current waveform data before and after the primary side circuit breaker is switched on need to be collected, the residual magnetism is measured and calculated, and the switching-on phase sequence and the switching-on time of the circuit breaker are determined, so that the magnetizing inrush current during switching-on of the distribution transformer is inhibited. According to the method, the actual condition of the power distribution network is fully considered, parameters are easy to obtain, the operation is completed within a period after the inherent closing time of the circuit breaker, the speed is high, the principle is deeper, the closing phase sequence and strategy are clear, operability is high, and the method is suitable for various scenes of the power distribution network.

The invention discloses an adaptive virtual impedance-based fault current limiting method for a network-forming converter, and belongs to the technical field of converter control. Comprising the following steps: collecting grid-side voltage, converter-side voltage and converter output current; carrying out current amplitude calculation on the grid-side voltage quantity to obtain a current effective value of the port of the converter; judging whether the current effective value of the current transformer port exceeds a current threshold value of the current transformer; and if yes, self-adaptive virtual impedance is introduced to carry out converter fault current limitation. The resistance part of the virtual impedance is used for suppressing surge current at the beginning of a fault; and the reactance part is used for suppressing the effective value of the fault transient current within the current limiting range. In the fault process, the current virtual impedance value is adaptively changed according to the effective value of the current overcurrent, and the virtual impedance can be automatically quitted after the fault end stage. The method is suitable for fault current suppression of the network-forming converter in various control modes, and has good feasibility and practical value.

The invention discloses a composite switch for reactive compensation capacitor bank switching and a control method thereof, and relates to the technical field of capacitor switching, and the method comprises the steps: detecting the capacity and switching data of each branch in a back-to-back capacitor bank through a reactive compensation controller, and determining a group capacitor to be subjected to switching operation according to a preset switching control condition; the reactive compensation controller determines the switching time sequence of each phase of each group capacitor according to the confirmed input / output operation instruction to be executed and the reference voltage of each group capacitor; and calculating the reactive state and the switching state of the switched power system through the reactive compensation controller. Compared with a conventional switching control method, the automatic phase selection switching control method has the advantages that closing inrush current and overvoltage are lower, the accuracy of phase control switching of the capacitor bank can be improved, high-frequency inrush current and pre-breakdown arcing phenomena can be reduced, meanwhile, the probability of rebreakdown can be reduced, and the service life of the capacitor bank can be prolonged. And the performance of the composite switch switched capacitor bank is improved.

The invention discloses a surge current suppression method and a surge current suppression system for an electricity utilization and acquisition terminal power supply, and the method comprises the steps: designing a surge current suppression circuit which comprises a current input circuit, an EMI circuit, a rectification circuit, a low-power-consumption surge current suppression circuit, an energy storage capacitor and a flyback power conversion circuit; external alternating current is obtained through the current input circuit, and then the external alternating current is converted into first high-voltage direct current through the EMI circuit and the rectifying circuit; the first high-voltage direct current is limited to charge the energy storage capacitor through the low-power-consumption surge current suppression circuit; and the second high-voltage direct current in the energy storage capacitor is transmitted to the flyback power conversion circuit for voltage conversion, and the low-voltage direct current is acquired and transmitted to an acquisition terminal power supply. The low-power-consumption surge current suppression circuit can automatically switch working states, efficiently suppress surge current and reduce circuit power consumption, is high in portability, can adapt to different power supply products by adjusting elements, and meets various surge suppression requirements.

The invention relates to split-phase phase control type inrush current suppression equipment and method for a power distribution network circuit device. The equipment comprises quick switches which are respectively connected in series in each phase line. In each phase line, the fast switch arranged on one phase line and the fast switches arranged on any other phase line except the phase line can share one set of closing energy supply device, and the closing energy supply device is internally provided with a pull-in branch; and the quick switches which are served by the switching-on energy supply device and need to be switched off synchronously share one switching-off energy supply device. According to the utility model, independent switching-on and switching-off energy supply devices respectively equipped for some fast switches in the existing equipment are integrated into one set of switching-on and switching-off energy supply device which can be commonly used by the fast switches, at least one set of switching-on and switching-off energy supply device is saved, and the equipment cost is saved. The pull-in branch avoids the situation that the equipment cannot effectively suppress the closing inrush current due to the wrong closing sequence of the two high-speed switches.

The invention discloses a transformer excitation inrush current suppression method, system and device, a medium and a program, and relates to the field of ships, the method is applied to a ship power generation system, and the ship power generation system comprises a transformer and a circuit breaker connected with the transformer; the method comprises the following steps: acquiring the state of the circuit breaker; if the state of the circuit breaker is a switching-on state, the magnetizing inrush current of the transformer is determined; determining the magnetic flux of the transformer based on the magnetizing inrush current, and selecting a moment when the magnetic flux of the transformer is minimum as an opening moment; determining an opening control angle; correcting the opening control angle based on the opening moment to obtain a corrected opening control angle; if the state of the circuit breaker is the opening allowing state, the transformer is controlled to be opened, and the opening angle is the corrected opening control angle. According to the technical scheme, the technical problem that an existing structure is complex can be solved.

The invention provides a plugging power-on circuit and electronic equipment, and is applied to the technical field of plugging control. The charging control circuit comprises a plugging controller and a switching device, the plugging controller comprises a step power-on circuit formed by N steps of charging control circuits, and N is an integer greater than 1; the input end of the stepped power-on circuit is connected with the power supply end of the whole machine, and is used for outputting gradually increased voltage through the N-order charging control circuit in the power-on stage; the output end of the step power-on circuit serves as the output end of the plug controller and is connected with the control end of the switching device. Therefore, through the design that the voltage rises slowly in the step power-on circuit in a step mode and the design that different steps have certain buffering in the power-on stage of the step power-on circuit, it can be guaranteed that the voltage exists between the steps so that the voltage can be recovered. And therefore, the amplitude of instantaneous surge current generated when the power supply end of the whole machine performs plugging and unplugging actions can be suppressed, and meanwhile, the stability of voltage in the circuit can be ensured.

The embodiment of the invention provides a voltage conversion circuit compatible with step-down and step-up and a switching power supply conversion chip, and the circuit comprises a main circuit which is configured to receive an input voltage and adjust an output voltage through the charging and discharging control of an inductor coupled with the input voltage; a mode control circuit configured to output a first voltage signal or a second voltage signal according to a magnitude relationship between the input voltage and the output voltage; the first transistor is coupled between the main circuit and the output voltage and is configured to control the grid voltage of the first transistor by the voltage signal output by the mode control circuit; the voltage loop control circuit is configured to generate control signals for controlling switches of a first power tube and a second power tube in the main circuit according to feedback of the output voltage and the reference voltage; and the protection circuit is configured to protect the first power tube. The problems that a large surge current passes through from input to output after an existing BOOST type circuit is powered on, the voltage obtained during compatible voltage reduction is inverted, and the soft start process of voltage boosting is not smooth are solved.