46results about How to "Increase current output capability" patented technology

Maximizing current from a given power inverter in an electrical rotating machine and maintaining the speed of an electrical rotating machine which has more turns of the winding.

The invention discloses a three-dimensional flexible neural microelectrode and a manufacturing method thereof. The microelectrode uses a flexible polymer as a base material, and performs progressive electroplating through a circular pattern design of a metal seed layer to form smooth three-dimensional convex features. The electrode site structure can not only ensure good contact between the electrode site and the nerve cells, but also avoid damage to the nerve tissue caused by the sharp edges and corners of the raised electrode sites in the existing three-dimensional neural microelectrode. In addition, through the composite electroplating process in the electroplating process, that is, nano-scale dispersants are added to the electroplating solution to form a submicron-scale microporous structure on the surface of the electrode, increasing the surface area of ​​the electrode site, thereby enhancing the current output capability of the electrode and ensuring the nerve. Effective stimulation of microelectrodes under the constraints of biosafety conditions. The three-dimensional flexible neural microelectrode provided by the invention can be widely used in the fields of neurological disease treatment, neurological rehabilitation, neurobiological basic research and the like.

The invention discloses a combined-type SVPWM (Space Vector Pulse Width Modulation) method. Different SVPWM methods are adopted according to different stator frequencies of an AC motor; when the stator frequency of the AC motor is lower than the low-frequency sector, a half-frequency method is adopted; when the stator frequency of the AC motor is in the medium-and-low frequency sector, a flat-top SVPWM method is adopted; when the stator frequency of the AC motor is in the medium-and-high frequency sector, a seven-segment SVPWM method is adopted; and when the stator frequency of the AC motor is in the high-frequency sector, an FFC (Fundamental Frequency Clocking) SVPWM method. Usually, for power loss of an inverter, the seven-segment SVPWM method is larger than the flat-top SVPWM method, the flat-top SVPWM method is larger than the half-frequency SVPPWM method, and the half-frequency SVPPWM method is larger than the FFC SVPWM method; and for the torque control precision, the four methods are optimal within different frequency ranges. According to the invention, the four SVPWM method are used together, different SVPWM methods are adopted according to different working conditions of the motor so as to play respective potentials; and therefore, lower power loss of the inverter and higher torque control precision are drawn into consideration, and the output power of the motor running in the high-frequency sector is increased.

Maximizing current from a given power inverter in an electrical rotating machine and maintaining the speed of an electrical rotating machine which has more turns of the winding.

The invention relates to a bidirectional direct-current motor driving integrated circuit, which comprises a control chip, an H-bridge switching circuit connected with the control chip, a forward input end, an inversion input end, a positive output end, a negative output end, a power supply positive electrode and a power supply negative electrode, wherein the H-bridge switching circuit is connected between the power supply positive electrode and the power supply negative electrode and comprises a first switching chip, a second switching chip, a third switching chip and a fourth switching chip which are connected with one another. Due to an optimized design and an optimized structure, the bidirectional direct-current motor driving integrated circuit has the advantages of small encapsulation volume, high efficiency, high driving current energy, multiple functions and the like; and by the bidirectional direct-current motor driving integrated circuit, the production and use cost of the whole circuit can be reduced.

The invention discloses a method for reducing loss of an electromobile vehicle-mounted inverter and improving current output capacity of the electromobile vehicle-mounted inverter, which is characterized in that a given voltage vector is formed by combining six basic voltage vectors with two zero current vectors so as to be equalized into a circular voltage rotary vector, and the time of the zero current vectors is completely 111, wherein 111 represents that three high-end tubes are all opened. In the invention, a novel control strategy is introduced to solve the problems of more switching times, low efficiency and asymmetric loads brought by a conventional modulation mode, so heating is reduced, the efficiency of the inverter is improved, heat asymmetry between an IGBT (Insulated Gate Bipolar Transistor) and a diode is reduced, and the current output capacity of the inverter is improved.

The invention discloses a chained hybrid energy storage system with an LC tuned filter and a control method thereof. The chained hybrid energy storage system comprises a chained hybrid energy storage structure formed by a capacitor power unit, a super capacitor energy storage unit and a storage battery energy storage unit, and the LC tuned filter which is connected with the chained hybrid energy storage structure so as to form an auxiliary power loop circuit. The chained hybrid energy storage system controls each unit by outputting a PWM (pulse width modulation) modulating wave, wherein the modulating wave is composed of two portions which are respectively a power frequency modulating wave and a high frequency modulating wave. The power frequency modulating wave controls power frequency alternating voltage and current output of the energy storage system. The high frequency modulating wave controls power to transfer among all the units through the auxiliary power loop circuit, wherein the super capacitor energy storage unit charges the capacitor power unit through the auxiliary power loop circuit so as to keep terminal voltage of the capacitor power unit stable, when current output of the storage battery energy storage unit is insufficient, the super capacitor energy storage unit provides the power for the storage battery energy storage unit through the auxiliary power loop circuit, and when residual energy of a super capacitor is insufficient, a storage battery charges the super capacitor through the auxiliary power loop circuit.

The invention discloses a power output control circuit which is arranged between the output end of a power circuit and a load. The power output control circuit is characterized in that the power output control circuit is composed of a switch tube and a detection control circuit set with the preset voltage value, the switch tube is connected between the output end of the power circuit and the load in series, the detection control circuit detects the output voltage of the power circuit, when the output voltage is lower than the preset voltage value, the switch tube is controlled to be turned off, and when the output voltage exceeds the preset voltage value, the switch tube is controlled to be turned on. The power output control circuit has the technical advantages that the supply voltage establishing time taken to supply power to the load through the power circuit can be adjusted, and the starting capability of the self-oscillation power circuit is improved. A back-level power source can be easily and reliably started until a pre-level power source is completely started, and the accurate and reliable starting time sequence of a multi-layer power supply system starting is guaranteed. The invention further discloses the multi-layer power supply system with the power output control circuit.

A BCD semiconductor device and a method for manufacture the same are provided, the BCD semiconductor device includes a first high voltage nLIGBT device, a second high voltage nLIGBT device, a first high voltage nLDMOS device, a second high voltage nLDMOS device, a third high voltage nLDMOS device, a first high voltage pLDMOS device, a Low Voltage NMOS Devices, a Low Voltage PMOS Devices, a PNP device and a diode device which are integrated on the same chip, wherein the High Voltage nLIGBT Device, the High Voltage nLDMOS Device, the High voltage pLDMOS device are dielectric isolated so as toa achieve complete isolation of high and low voltage devices. A nLIGBT, nLDMOS, Low Voltage NMOS, low voltage PMOS and low voltage NPN are are monolithically integrated on a substrate, The isolation region composed of dielectric, buried layer of second conductivity type, dielectric groove and injection region of first conductivity type realizes high and low voltage all-dielectric isolation on integrated chip, avoiding high and low voltage crosstalk problem. The multi-channel design is adopted in six types of high voltage tubes, which can effectively increase the current output capability of highvoltage tubes.

The invention discloses a hydrogen production converter topological structure suitable for accessing a single-phase alternating current system and a control method, and the structure comprises an alternating current power supply which is a single-phase alternating current voltage source, is connected in series with an alternating current reactor and then is connected in parallel with a preceding-stage rectification module, and the low-voltage end after parallel connection is connected with a grounding point; the preceding-stage rectification module is provided with a plurality of groups of direct current output ends, and all the direct current output ends of the preceding-stage rectification module are connected with the direct current input end of the second-stage conversion module; the second-stage conversion module is provided with a plurality of groups of direct current input ends and direct current output ends, all the direct current input ends are connected with the direct current output ends corresponding to the preceding-stage rectification module, all the direct current output ends of the second-stage conversion module are connected in parallel, and the positive electrode and the negative electrode of the direct current output end after parallel connection are connected with the positive electrode and the negative electrode of the electrolytic cell respectively; and the topological structure also comprises a control system module which calculates and outputs a control signal. According to the invention, the current output capability is further improved, the conversion from high-voltage alternating current to low-voltage direct current is realized, and a higher voltage transformation ratio is easy to realize.

The invention discloses a linear voltage-stabilizing circuit with continuously adjustable output voltage and a power supply having the circuit. The linear voltage-stabilizing circuit with continuously adjustable output voltage includes a voltage-stabilizing input stage module and an amplification stage module. The amplification stage module includes an intermediate amplification stage module, or includes an intermediate amplification stage module and an output amplification stage module. The voltage-stabilizing input stage module is used for generating a reference voltage; the intermediate amplification stage module is used for performing power amplification processing on the reference voltage and outputting an amplified voltage signal or sending to the output amplification stage module; and the output amplification stage module is used for performing output power amplification on the voltage signal and sending to a post-stage. By adoption of the linear voltage-stabilizing circuit with continuously adjustable output voltage and the power supply having the circuit, voltage output is stable and adjustable, influence by temperature and input voltage is small, and the linear voltage-stabilizing circuit and the power supply having the same are simple and reliable, and has relatively high cost performance.

The invention discloses an asymmetric chain type hybrid energy storage system and a control method thereof. The asymmetric chain type hybrid energy storage system mainly comprises a chain type hybrid energy storage structure and an LC tuned filter, wherein the chain type hybrid energy storage structure is composed of a super-capacitor energy storage unit and a rechargeable battery energy storage unit, and the LC tuned filter is connected with the chain type hybrid energy storage structure to form an assistant power loop. When charging and discharging, the alternating voltage output from the rechargeable battery energy storage unit comprises a high-frequency component through controlling PWM switching signals in a cascade converter of the rechargeable battery energy storage unit, and the power flow size and direction between different units can be changed through regulating the amplitude and phase of the high-frequency voltage component. Through power exchange, when the current output from the rechargeable battery energy storage unit is insufficient, the super-capacitor energy storage unit is capable of providing power for the rechargeable battery energy storage unit through the assistant power loop so as to improve the current output ability thereof; when the surplus energy of the super-capacitor is insufficient, the rechargeable battery charges the super-capacitor through the assistant power loop.

The invention relates to the technical field of lithium batteries, in particular to a lithium battery structure with a leading-out wire. The invention relates to a lead-type anode post lithium battery comprising a battery housing; a lithium sheet, a side film and a carbon package are sequentially sheathed in the battery housing, wherein the port of the batter housing is provided with a cover film; the cover film is provided with a nut cap body which is connected with an anode leading-out structure, and the anode leading-out structure comprises a current collector performing the current collection function, an anode post and the leading-out wire; the current collector, the anode post and the leading-out wire are respectively independent components. The anode leading-out structure of the invention is characterized in that the current collector can choose pure nickel and alloy thereof with favourable electrical conductivity to manufacture and is manufactured into a flat structure, thus increasing the current output capacity of the battery and avoiding bending phenomenon when the current collector is inserted into the carbon package. The anode post adopts 4J28 alloy material to realize better sealing with glass, and the leading-out wire can adopt tinning alloy with strong tinning ability; in addition, the leading-out wire has favourable toughness and is not easy to break off.

The invention discloses an combined interleaved direct current conversion system outputting ripple-free waves, which is used for carrying out charge and discharge test on a power battery, and comprises an H-bridge direct-current converter and a multi-unit interleaved circuit, wherein the H-bridge direct-current converter is used for carrying out direct current conversion on a direct current bus voltage output externally, the multi-unit interleaved circuit comprises one or more two-way interleaved direct-current converters, input ends of the two-way interleaved direct-current converters are electrically connected with an output end of the H-bridge direct-current converter, output ends of the two-way interleaved direct-current converters are electrically connected with the power battery, and a control end of the double-path interleaved direct current converter can receive a phase-shifted PWM pulse waveform signal. According to the combined interleaved direct current conversion system outputting ripple-free waves, the output current ripple is zero, and therefore the size of a filter inductor and the size of a filter capacitor are reduced.

The invention discloses an AC / DC switching circuit based on hybrid parallel power devices. The AC / DC switching circuit based on the hybrid parallel power devices comprises multiple electric current switching sub-circuits. The electric current switching sub-circuits comprise multiple interleaved switching modules; the switching modules comprise multiple direct-parallel power devices; output ends of a power source are in electric connection with the multiple electric current switching sub-circuits in a one-to-one mode and a switching voltage is outputted. According to the AC / DC switching circuit based on the hybrid parallel power devices, the electric current output capability is improved through a direct-parallel method of the power devices, the electric current output capability is further improved through an interleaved-parallel method, meanwhile, output harmonic waves are reduced, and electric current output capability of devices is greatly improved on the premise of not increasing the through-flow capability of an individual device. At the same time, a flexible design on high electric current output can be achieved, components of multiple electric current specifications can be selected, and the difficulty in heat dissipating design of the power devices can be greatly lowered.

The invention discloses a fabrication method of a photovoltaic module. The fabrication method comprises the steps of preparing a precursor solution; depositing the precursor solution on a surface of adesignated photovoltaic material layer to form a perovskite-based spectrum down-conversion film; sequentially laying all photovoltaic material layers; and performing high-temperature vacuum lamination on the photovoltaic material layers which are sequentially laid to form the photovoltaic module. According to the fabrication method of the photovoltaic module, the perovskite-based spectrum down-conversion film is compatible with a traditional photovoltaic cell package process, the perovskite-based spectrum down-conversion film is used as a spectrum down converter, ultraviolet / blue-light wavelength in solar spectrum is converted to wavelength within a high-response wavelength range of the solar cell, and the sunlight conversion efficiency of the photovoltaic module is improved.

The invention discloses an energy-saving driving method of a plasma display plate and its two types of energy-saving driver. It adjusts the number of the working energy-saving circuit or the corresponding parameter of the same energy-saving circuit so as to make the acoustic resonance on best condition by computing the equivalent condensing value of the light-emitting unit number; it stores the energy of the PDP display plate shunt capacitance in the energy storing capacitance by controlling the time sequence. The energy storing capacitance uses the acoustic resonance to charge the PDP in charging mode.

The invention discloses a mixed gas plasma collector tube which comprises a sealed container, wherein a low-pressure gas material is filled in the sealed container; electrode plates are arranged in the sealed container; the low-pressure gas material is prepared from two or more out of hydrogen, nitrogen, helium, neon, argon, krypton, xenon and the like, and the pressure of the material is 1*10<-5> to 1*10<-1>Pa. According to the mixed gas plasma collector tube, electric energy can be output under the conditions of no mechanical movement, no external power, no noise, no release of heat energy, no visible light, no toxic substance leakage and no release of harmful electromagnetic waves.

The invention discloses a state observation based IGBT turn-off voltage peak inhibition system and control method. The method comprises the following steps that a controller reads a bus voltage valueVdc and an output current value Ic of an IGBT module within a switching period; the read bus voltage value Vdc and the output current value Ic of an IGBT module within the switching period are analyzed, and a turn-off control instruction is output to a drive board; a multi-level turn-off circuit adds one level of voltage to a gate electrode signal of the IGBT module in the turn-off process, and the drive board adjusts the duration of a voltage Vm of the multi-level turn-off circuit according to the received turn-off control instruction; and the turn-off voltage peak of the IGBT module inhibited via the process in which the multi-level turn-off circuit changes the gate electrode of the IGBT module. According to the IGBT state after observation, the multi-level turn-off circuit is adjusted,the inhibition effect of the IGBT turn-off voltage peak is improved, and the total turn-off delay time and total turn-off loss of the IGBT are reduced effectively.

The invention relates to a suspension collector PNP integrated circuit transistor and a manufacturing method thereof. An N-type first epitaxial layer and an N-type second epitaxial layer are sequentially formed on a P-type substrate; an N-type buried layer is arranged in the P-type substrate, a collector P-type buried layer is arranged in the first epitaxial layer which is positioned on the N-type buried layer, and a collector upper isolation unit is arranged in the second epitaxial layer which is positioned on the collector P-type buried layer; a P-type lower isolation unit is arranged in the first epitaxial layer which is positioned on the upper portion of the periphery of the N-type buried layer, and a P-type upper isolation unit is arranged in the second epitaxial layer which is positioned on the P-type lower isolation unit; a first P+ diffusion region is arranged in the P-type upper isolation unit, and serves as a collector; an N+ diffusion region is arranged in the second epitaxial layer enclosed by the collector upper isolation unit and the collector P-type buried layer, and serves as a base; and a second P+ diffusion region is arranged in the second epitaxial layer enclosed by the N+ diffusion region, and serves as an emitter. The suspension collector PNP integrated circuit transistor and the manufacturing method thereof can reduce collector series resistance and saturation voltage drop, and increase current output capacity.

The invention discloses an active neutral-point-clamped three-level circuit and a control method thereof. The active neutral-point-clamped three-level circuit comprises a direct-current positive port, a direct-current neutral point, a direct-current negative port, an alternating-current output port and a bridge arm circuit arranged between the direct-current positive port and the direct-current negative port. The bridge arm circuit comprises four full-control switches, two half-control switches and six diodes; the control method comprises the following steps: controlling four full-control switches to work in a high-frequency switch working state with the same frequency as a carrier wave, and controlling two half-control switches to work in a power-frequency switch working state with the same frequency as a signal wave, so that an alternating-current output port of the active neutral-point-clamped three-level circuit outputs a pulse width modulation signal; according to the active neutral-point-clamped three-level circuit and the control method thereof, a full-control switch is replaced by a half-control switch, so that the cost of the active neutral-point-clamped three-level circuit is reduced, and the current output capability when the voltage of an output port is relatively low is improved.

The invention discloses a voltage and current signal conversion circuit. The voltage and current signal conversion circuit comprises a resistor R1, a resistor R2, an operational amplifier A1, a resistor Ro1, a resistor R3, a resistor R4, an operational amplifier A2, a resistor R5, a resistor Ro2 and an operational amplifier A3. The operational amplifier A1 and a periphery circuit constitute a same-phase summation operational circuit, and a voltage follower is formed by the operational amplifier A2. The resistance values of the resistor R1, the resistor R2, the resistor R3 and the resistor R4 are equal, and a current flowing through the resistor Ro1 is equal to Ui / Ro1. The current is provided by operational amplifier A1 and a power supply VCC together. The output ability is increased by 40 mA through the resistor R5 and the operational amplifier A3. According to the voltage and current signal conversion circuit, the purpose of improving the current output ability of by two times is achieved.

The invention discloses a combined-type SVPWM (Space Vector Pulse Width Modulation) method. Different SVPWM methods are adopted according to different stator frequencies of an AC motor; when the stator frequency of the AC motor is lower than the low-frequency sector, a half-frequency method is adopted; when the stator frequency of the AC motor is in the medium-and-low frequency sector, a flat-top SVPWM method is adopted; when the stator frequency of the AC motor is in the medium-and-high frequency sector, a seven-segment SVPWM method is adopted; and when the stator frequency of the AC motor is in the high-frequency sector, an FFC (Fundamental Frequency Clocking) SVPWM method. Usually, for power loss of an inverter, the seven-segment SVPWM method is larger than the flat-top SVPWM method, the flat-top SVPWM method is larger than the half-frequency SVPPWM method, and the half-frequency SVPPWM method is larger than the FFC SVPWM method; and for the torque control precision, the four methods are optimal within different frequency ranges. According to the invention, the four SVPWM method are used together, different SVPWM methods are adopted according to different working conditions of the motor so as to play respective potentials; and therefore, lower power loss of the inverter and higher torque control precision are drawn into consideration, and the output power of the motor running in the high-frequency sector is increased.

The invention discloses a state observation based IGBT turn-off voltage peak inhibition system and control method. The method comprises the following steps that a controller reads a bus voltage valueVdc and an output current value Ic of an IGBT module within a switching period; the read bus voltage value Vdc and the output current value Ic of an IGBT module within the switching period are analyzed, and a turn-off control instruction is output to a drive board; a multi-level turn-off circuit adds one level of voltage to a gate electrode signal of the IGBT module in the turn-off process, and the drive board adjusts the duration of a voltage Vm of the multi-level turn-off circuit according to the received turn-off control instruction; and the turn-off voltage peak of the IGBT module inhibited via the process in which the multi-level turn-off circuit changes the gate electrode of the IGBT module. According to the IGBT state after observation, the multi-level turn-off circuit is adjusted,the inhibition effect of the IGBT turn-off voltage peak is improved, and the total turn-off delay time and total turn-off loss of the IGBT are reduced effectively.

The invention discloses a pixel circuit and a driving circuit thereof as well as an X-ray detector. The pixel circuit comprises an initialization module, an output module, an output control module, aphotodiode and a photodiode control module. In the technical scheme of the invention, photocurrent generated by the photodiode is used as a control signal under the condition that the output control module is conducted; on the one hand, the output module is controlled to be conducted; on the other hand, current values, outputted by the conducted output control module and the conducted output module, of a first power supply signal end are adjusted, i.e., current which is finally outputted by the pixel circuit is jointly determined by the photocurrent generated by the photodiode and the first power supply signal end rather than direct output of the photocurrent generated by the photodiode, so that the power output capability of the pixel circuit is improved, further the signal-noise-ratio isimproved and the image quality is improved.

The invention discloses a hydrogen production converter topology and control method suitable for connecting to a single-phase AC system. The low-voltage end after parallel connection is connected to the grounding point; the front-stage rectification module has multiple sets of DC output terminals, and all the DC output terminals of the front-stage rectification module are connected to the DC input terminals of the second-stage conversion module; the second-stage conversion module has multiple sets of All DC input terminals and DC output terminals are connected to the corresponding DC output terminals of the front-stage rectification module, and all DC output terminals of the second-stage conversion module are connected in parallel with each other. The positive and negative poles of the parallel-connected DC output terminals are respectively It is connected with the anode and cathode of the electrolytic cell; it also includes a control system module to calculate and output control signals; the invention further improves the current output capability, realizes the transformation from high-voltage AC to low-voltage DC, and is easy to realize a higher voltage conversion ratio.

The invention provides a power electronic controller and an electric vehicle, belonging to the technical field of AC motor drive control. The power electronic controller of the present invention is used to provide an AC input for an AC motor and control the AC motor, which includes: a first inverter power module assembly and a second inverter power module assembly arranged in parallel; The cooling interlayer between the first inverter power module assembly and the second inverter power module assembly; the cooling channel shared by the first inverter power module assembly and the second inverter power module assembly is arranged in the cooling interlayer . The power electronic controller of the present invention has large power output and current output capabilities, good work reliability, better heat dissipation efficiency, and a compact overall structure.

The invention provides a BCD semiconductor device and a manufacturing method thereof, comprising a first high-voltage nLIGBT device, a second high-voltage nLIGBT device, a first high-voltage nLDMOS device, a second high-voltage nLDMOS device, a third high-voltage nLDMOS device, The first high-voltage pLDMOS device, low-voltage NMOS device, low-voltage PMOS device, PNP device and diode device, high-voltage nLIGBT device, high-voltage nLDMOS device, and high-voltage pLDMOS device all adopt dielectric isolation to realize complete isolation of high-voltage and low-voltage devices. The invention is implemented on a substrate Monolithic integration of nLIGBT, nLDMOS, low-voltage NMOS, low-voltage PMOS and low-voltage NPN, the isolation area composed of dielectric, second conductivity type buried layer, dielectric groove and first conductivity type injection region realizes high and low voltage full dielectric isolation on the integrated chip , to avoid the high-voltage and low-voltage crosstalk problem, the multi-channel design is adopted in the six types of high-voltage tubes, which can effectively increase the current output capacity of the high-voltage tubes.

The invention discloses an asymmetric chain type hybrid energy storage system and a control method thereof. The asymmetric chain type hybrid energy storage system mainly comprises a chain type hybrid energy storage structure and an LC tuned filter, wherein the chain type hybrid energy storage structure is composed of a super-capacitor energy storage unit and a rechargeable battery energy storage unit, and the LC tuned filter is connected with the chain type hybrid energy storage structure to form an assistant power loop. When charging and discharging, the alternating voltage output from the rechargeable battery energy storage unit comprises a high-frequency component through controlling PWM switching signals in a cascade converter of the rechargeable battery energy storage unit, and the power flow size and direction between different units can be changed through regulating the amplitude and phase of the high-frequency voltage component. Through power exchange, when the current output from the rechargeable battery energy storage unit is insufficient, the super-capacitor energy storage unit is capable of providing power for the rechargeable battery energy storage unit through the assistant power loop so as to improve the current output ability thereof; when the surplus energy of the super-capacitor is insufficient, the rechargeable battery charges the super-capacitor through the assistant power loop.

The invention provides a method for preparing a flexible piezoelectric nanogenerator based on a perovskite polymer composite material. The steps include: first preparing a perovskite precursor spinning solution, and then using a screen printing process to form a low-temperature silver paste Prepare silver finger electrodes on PET substrates as raw materials, and then use the electrospinning machine to use the finger electrodes pasted on the high-speed drum as the receiving plate, set different parameters for high-pressure spinning to obtain composite fibers, and finally based on the composite fibers Assembly of flexible piezoelectric nanogenerators. The invention provides a method for preparing a flexible piezoelectric nanogenerator based on a perovskite polymer composite material, and the prepared flexible piezoelectric nanogenerator has good stability.