2713 results about "Bridge circuit" patented technology

The invention provides a digital hydraulic pump test bed and a digital hydraulic pump control performance verification method. The invention provides a digital hydraulic pump test bed. The digital hydraulic pump test bed comprises a driving module and a loading module, wherein the driving module comprises a tested hydraulic pump, a direct-current adjustable-speed motor, a plurality of couplings and a shock absorber, one ends of the couplings are connected with the tested hydraulic pump, the other ends of the couplings are connected with the direct-current adjustable-speed motor, the shock absorber is connected with the direct-current adjustable-speed motor, and the sensors are installed on the tested hydraulic pump; a plurality of pressure oil ports of the tested hydraulic pump are connected with the loading module, the loading module comprises a bridge loop and a loading loop, the plurality of pressure oil ports are respectively connected with a first series connection point and a second series connection point of the bridge loop, and a parallel connection point of the bridge loop is connected to the loading loop. The digital hydraulic pump test bed and the digital hydraulic pump control performance verification method are used for verifying the key control performance of the digital hydraulic pump and are wide in application range.

The disclosure provides a circuit modeling method for a dual-active-bridge-type micro-inverter. The method equates dual-active-bridge-type micro-inverter to a standard dual-active-bridge circuit by establishing an equivalent circuit model, thereby establishing a third-order large signal model and a third-order small signal model of the micro-inverter, so as to facilitate the solution of a circuit state variable and the analysis of the dynamic performance.

The invention discloses a single-stage bidirectional power conversion topological structure capable of realizing wide-range soft switching and a control method of the single-stage bidirectional power conversion topological structure. In-bridge and inter-bridge phase shift control of a double-half-bridge circuit and a high-frequency switch matrix provides a basis for realizing soft switching of all power tubes; the switching frequency is adjusted in real time according to the magnitude of the port voltage, soft switching within a wide voltage change range is achieved, the current of a bridge arm connected with the primary side of the second transformer is the sum of the primary side current of the second transformer and the current of an inductor connected in parallel with the second transformer, and the inductance value of the inductor connected in parallel with the primary side of the second transformer is designed. The current of the bridge arm connected with the primary side of the second transformer can be effectively changed, so that the soft switching implementation range of the switching tube of the bridge arm connected with the primary side of the second transformer in a wide power transmission range can be expanded.

The invention discloses an insulation detection failure diagnosis method, which comprises the following steps of: in an unbalanced bridge circuit, controlling an upper bridge arm switch KP and a lower bridge arm switch KN to be switched on simultaneously, controlling a switch KPE between an upper bridge arm and a lower bridge arm and a vehicle body ground to be switched off simultaneously, respectively acquiring and calculating voltage values # imgabs0 # and # imgabs1 # of sampling resistors RP1 and RN1, the sampling resistor RN1 is a resistor of the negative electrode of the lower half bridge arm; the internal total voltage VBAT between the battery BAT + and the battery BAT-is calculated according to the obtained voltage values # imgabs2 # and # imgabs3 # and the voltage division ratio coefficient; and judging a fault reason according to whether the VBAT is 0 or not. According to the method, a single failure fault and multiple failure fault diagnosis method is provided for the situation that normal insulation detection judgment is affected after an external input signal of an unbalanced bridge method breaks down.

The invention discloses an unmanned aerial vehicle hybrid power supply system energy management method based on fuzzy double closed-loop control in the technical field. An unmanned aerial vehicle hybrid power supply system comprises a hydrogen fuel cell, a lithium battery and a double active bridge circuit, and the hydrogen fuel cell and the lithium battery serve as energy sources of the hybrid power supply system; the dual-active bridge circuit is used for connecting a hydrogen fuel cell and a lithium battery and transmitting energy to an unmanned aerial vehicle load, the energy management method comprises a fuzzy power control outer ring and a fuzzy PI current control inner ring, the fuzzy power control outer ring dynamically distributes power according to a power signal required by the unmanned aerial vehicle load, a power error signal and a lithium battery charge state, and the fuzzy PI current control inner ring controls the power to be output. The fuzzy PI current control inner loop generates an accurate driving signal according to the battery power and the voltage ratio after fuzzy distribution, a switching device of the dual active bridge circuit is driven to be switched on, energy transmission is achieved, and the problems that in existing unmanned aerial vehicle energy management, the cruising ability is insufficient, and the energy utilization efficiency is low can be effectively solved.

The invention relates to the technical field of power conversion, and discloses an intelligent power converter system based on adaptive load regulation and a control method thereof. Comprising a power converter body, a plurality of sockets of different types are arranged on the power converter body, and a load sensing sensor, a micro-control unit, a step-down circuit and a bridge circuit are arranged in the power converter body; the load sensing sensor is electrically connected with the micro-control unit and is used for monitoring the power requirement of equipment connected with each socket in real time and transmitting a corresponding monitoring signal to the micro-control unit; the micro-control unit is electrically connected with the step-down circuit and the bridge circuit, and is used for controlling the step-down circuit and the bridge circuit to adjust output voltage and current according to a monitoring signal transmitted by the load sensing sensor; the micro-control unit controls the step-down circuit and the bridge circuit to automatically adjust the output voltage and current of the corresponding jacks according to the equipment power requirement monitored by the load sensing sensor, so as to realize the self-adaptive load adjustment of each jack.

The invention provides a battery management fusion system, an intelligent charging method, equipment and a storage medium, and belongs to the technical field of automobiles. The battery management fusion system comprises a high-voltage control execution unit, a high-voltage battery cell acquisition unit, a daisy chain bridging circuit, a low-voltage sampling control execution unit and a power domain controller, the high-voltage control execution unit and the high-voltage cell acquisition unit are respectively connected with the daisy chain bridging circuit, and the daisy chain bridging circuit is in communication connection with the power domain controller through a CAN bus; and the low-voltage sampling control execution unit is in communication connection with the power domain controller through a CAN bus. According to the system, the power battery management system and the low-voltage lithium battery management system of the vehicle can share one controller, namely, independent controllers do not need to be arranged for the power battery management system and the low-voltage lithium battery management system respectively, so that resource waste is avoided, and hardware cost is reduced.

The invention discloses a multi-objective optimization method and system for dual active bridge circuit expansion phase shift modulation, and the method comprises the steps: calculating a voltage matching ratio, and determining an external phase shift angle ratio based on a difference value between an output voltage and an output voltage reference value; according to the voltage matching ratio and the external phase shift angle ratio, obtaining an internal phase shift angle ratio of the primary side full bridge through an offline lookup table; calculating the maximum transmission power of the dual-active bridge converter, and determining a current working mode from the six preset working modes based on the size relationship between the inner phase shift angle ratio and the outer phase shift angle ratio; generating an optimal modulation strategy through a multi-objective optimization algorithm by taking the current effective value and the current peak value as optimization objectives and combining the voltage matching ratio and the periodic parameters of the current working mode; and generating a trigger signal of each switch tube of the dual-active bridge converter. Through six-mode working area division, complete differential algorithm boundary constraint and off-line-on-line collaborative optimization, the contradiction between the current stress and the soft switching range of the converter under extended phase shift modulation is solved.

The invention relates to a method for determining the rotor current of a separately excited synchronous machine (FSM), comprising a stator and a rotor with an excitation winding. Initially, an excitation supply voltage is connected via a controlled bridge circuit to terminals A and B of an inductive transformer. On the secondary side, this transformer is connected to the excitation winding of the FSM via a rectifier. The controlled bridge circuit can be regulated via switching parameters using a control unit. Subsequently, the primary current of the excitation winding of the FSM is sampled at terminals A and B. Then, an evaluation time for the sampled primary current is determined, and the primary current is evaluated at that time. The evaluated primary current is then converted to the rotor current. Finally, the rotor current at the evaluation time is output.

The invention belongs to the technical field of power electronics, and particularly relates to a modular commutated converter with high overload capacity. The modular commutation type converter is formed by connecting at least one large-current turn-off commutation bridge and at least one cascade module chain in parallel, wherein the large-current turn-off commutation bridge is an H-bridge circuit comprising four large-current turn-off commutation bridge arms; the large-current turn-off commutation bridge arm comprises at least one single switch device module SDM and at least one high-turn-off single switch device module HDM which are connected in series, and the current turn-off capacity of the high-turn-off single switch device module HDM is larger than the current at the turn-off moment of the large-current turn-off commutation bridge arm. According to the technical scheme of the invention, high-power overload operation can be realized in a short time, so that voltage and inertia support can be effectively carried out on a power grid. Compared with an existing structure, the topological structure has the advantage that the manufacturing cost is obviously reduced.

The embodiments of the present disclosure relate to a high-voltage frequency converter system. The high-voltage frequency converter system comprises a first filtering unit, a rectification and feedback unit, a direct-current bus unit, an inversion unit, a second filtering unit and a controller unit, and is configured to be connected between an input voltage end and an electric motor unit, wherein the first filtering unit is connected between the input voltage end and the rectification and feedback unit, comprises a filter and a common-mode reactor, and is configured to enable an input voltage to be adjusted to meet the standard that the voltage of the rectification and feedback unit meets; and the rectification and feedback unit is connected between the first filtering unit and the direct-current bus unit, comprises a bridge circuit consisting of an IGBT-based active front-end frequency converter, and is configured to execute conversion between an alternating-current voltage signal and a direct-current voltage signal.

The invention belongs to the technical field of mechanical test tool equipment, and particularly relates to an electro-hydraulic speed regulator test testing device. Comprising the steps that a virtual diesel engine model generates a signal and supplies the signal to a rotating speed controller, an alternating current power supply supplies power to a frequency converter to drive a motor to operate, and the rotating speed of the motor is transmitted to an electro-hydraulic speed regulator through a first coupler to drive a main pump in the electro-hydraulic speed regulator to build pressure; a hydraulic bridge circuit in the electro-hydraulic speed regulator acts to drive the output shaft to rotate, the output shaft transmits an output signal back to the virtual diesel engine model through the flywheel, the magnetic powder brake and the angle sensor, and the virtual diesel engine model feeds back the signal to the magnetic powder brake through the brake controller; and the output torque of the electro-hydraulic speed regulator is ensured to meet the operation requirement and is confirmed by the torque sensor. The electro-hydraulic speed regulator test device has the advantages that the electro-hydraulic speed regulator test device is provided with the outer circulation oil way, and the test requirements of various electro-hydraulic speed regulators can be met.

The power supply conversion circuit includes an isolation transformer, and the isolation transformer includes at least two primary coils and at least one secondary coil. Each primary coil is connected to a half-bridge circuit by using a first resonant network, and half-bridge circuits corresponding to the at least two primary coils are connected in series between two electrodes of a power supply. The half-bridge circuit is connected in parallel to a voltage divider, the voltage divider includes a first capacitor and a second capacitor that are connected in series, a first terminal of the first resonant network is connected to an intermediate node of the half-bridge circuit, and a second terminal of the first resonant network is connected to a connection point between the first capacitor and the second capacitor.

The invention discloses a switching loss optimization control method and system of an energy storage DC converter. Comprising the following steps: firstly, acquiring battery side voltage / current and bus side voltage / current of the energy storage direct current converter; calculating according to the battery side voltage and the bus side voltage to obtain the voltage ratio of the two sides of the energy storage direct current converter; then, control power is obtained through calculation according to the battery side voltage / current and the bus side voltage / current; then, determining the working mode of the dual-active bridge circuit by using the control power of the energy storage direct-current converter; and finally, according to the working mode of the dual-active bridge circuit, the actual power of the dual-active bridge circuit is adjusted, and the switching loss optimization of the energy storage DC converter is completed. When the battery side voltage, the bus side voltage and the load power of the circuit are changed, the control power of the controller can be continuously changed, smooth transition is realized among all working modes, the output signal and the power gain are basically linear, and the dynamic response speed can be improved.

A half-bridge driver circuit periodically repeats switching cycles by closing a first FET via a first drive signal, detecting an instant when a current flowing through the first FET reaches a threshold and then opening the first FET and closing a second FET via a second drive signal. An error amplifier generates a control voltage by comparing a feedback signal with a reference signal, and a variable current generator generates a first current as a function of the control voltage. The error amplifier includes a proportional-integral controller, and a slope compensation circuit that generates a second current as a ramp signal. The threshold is generated by subtracting the second current from the first current. In response to detecting the instant, the second current is sampled and a signal indicative of the threshold is generated by subtracting the sampled second current from the first current.

A power tool is provided including a power supply interface receiving a removable battery pack, a brushless direct current (BLDC) motor including a rotor and a stator, and a multi-phase inverter bridge circuit. A controller is provided to output drive signals to the inverter bridge circuit to control flow of current from to the motor, where each drive signal is activated within each corresponding phase of the motor within a conduction band. The controller is configured to control a length of the conduction band at a variable value within a first torque range below a torque threshold and at a substantially constant value within a second torque range above the torque threshold. The torque threshold is greater than approximately 1 Newton-meters and the motor produces a maximum power output of at least approximately 1250 watts at the torque of approximately 1 Newton-meters.

The invention belongs to a transformer structure, and provides a direct-current transformer, a power transmission system and a control method of the power transmission system in order to solve the technical problems that a three-level circuit topology in a power module in an existing direct-current transformer is large in number of power devices, complex in structure and large in layout and wiring difficulty. Each power module comprises a first-stage circuit, a second-stage circuit, two first direct-current bus capacitors and two second direct-current bus capacitors, the two first direct-current bus capacitors are connected in series to form a first capacitor circuit, and the two second direct-current bus capacitors are connected in series to form a second capacitor circuit. The first-stage circuit comprises two first half-bridge circuits which are connected in series, and the second-stage circuit is a dual-active bridge converter based on a series half-bridge. The number of power devices is remarkably reduced, meanwhile, the layout and wiring difficulty of the whole circuit is simplified, and popularization and application of the direct-current transformer are easier.

The invention discloses an inverter circuit, a maximum power tracking method thereof and energy storage inverter equipment, the inverter circuit comprises a full-bridge circuit, a transformer and a half-bridge circuit, the full-bridge circuit is connected to the half-bridge circuit through the transformer, the full-bridge circuit is connected with a photovoltaic module, and the half-bridge circuit is connected with an alternating current side; the maximum power tracking method comprises the following steps: acquiring the input power of the photovoltaic module in the current period and the input power of the photovoltaic module in the previous period, and the reference output voltage of the inverter in the first period; determining a voltage adjustment step length according to the power deviation and the voltage deviation, the power deviation being based on the input power of the current period and the previous period, and the voltage deviation being based on the input voltage of the photovoltaic module of the current period and the previous period; obtaining the reference output voltage of the current period according to the voltage adjustment step length and the reference output voltage of the previous period; and generating a driving signal according to the reference output voltage of the current period so as to control the inverter circuit. According to the invention, the maximum power point of the photovoltaic module can be tracked by the inverter circuit.

The invention provides a three-phase single-stage isolation rectifier and a power factor correction method thereof, and belongs to the technical field of switching power supplies. The three-phase single-stage isolation rectifier comprises a low-pass filtering unit, a sector selection unit, a DC / DC high-frequency conversion unit and a compensation conversion unit, wherein the low-pass filtering unit is connected with a three-phase alternating current, and the DC / DC high-frequency conversion unit is connected with a direct-current load; the sector selection unit comprises a first bridge circuit and a switching circuit, the compensation conversion unit comprises a power frequency switching unit and a high-frequency converter, the first input end of the power frequency switching unit is connected with a first terminal P, the second input end of the power frequency switching unit is connected with a third terminal Y, the third input end of the power frequency switching unit is connected with a second terminal N, and the second input end of the power frequency switching unit is connected with a third terminal Y; the output end of the power frequency switching unit is connected with the output end of the high-frequency converter, the first input end of the high-frequency converter is connected with the first terminal P, and the second input end of the high-frequency converter is connected with the second terminal N. The conversion efficiency of the isolation rectifier can be improved.

The invention relates to the technical field of power distribution automation auxiliary power supply control, and discloses an intelligent power distribution circuit system for a digital ring main unit, which comprises a transient voltage gradient induction bridge circuit, a hardware signal processing circuit, a power switch unit and a controlled energy release unit, according to the system, a transient voltage gradient induction bridge circuit is used for collecting a primary side bus voltage change rate signal, a hardware signal processing circuit carries out derivation operation on an induction signal and compares the induction signal with a voltage gradient threshold value, and a power switch unit is blocked at the moment that the voltage abnormally drops so as to cut off a load current path. According to the invention, a hardware parameter direct mapping mechanism is utilized to realize microsecond transient protection response, and the physical decoupling of protection logic and digital software is realized by balancing bus potential pulse caused by sudden unloading of a load through the inherent dehumidification resistor in the multiplexing cabinet.

The invention belongs to the related technical field of photovoltaic inverter compensation systems, and particularly relates to a high-power-quality converter with chopping inversion multiplexing, which comprises series and parallel APFs (active power filters), a Z-type grounding transformer, a three-phase bridge circuit and a photovoltaic power generation unit, one end of the transformer is connected to the alternating current side of the bridge circuit, the other end of the transformer is externally connected with a load power grid, a grounding point is led out to be connected to one end of the photovoltaic power generation unit while the transformer is connected to the alternating current side, and the other end of the photovoltaic power generation unit is connected to the bridge circuit; the series APF and the parallel APF form a unified power quality controller and are connected between the transformer and the bridge circuit; the parallel APF is used for compensating voltage sine distortion and voltage imbalance in the presence of an inversion working condition, and the series APF is used for filtering harmonic current and compensating reactive power in the presence of the inversion working condition; and the transformer is used for providing a grounding reference for the photovoltaic power generation unit in the presence of a chopping working condition and offsetting a zero-sequence harmonic component of the alternating current side voltage in the presence of an inversion working condition.

A power receiving device performs a power supply control including repeatedly performing: first rectification mode in which in response to detection of an energization of a first bridge circuit, a first high-side and a second low-side switches are turned on and a first low-side and a second high-side switches are turned off; and second rectification mode in which in response to detection of an energization of a second bridge circuit, the first low-side and the second high-side switches are turned on and the first high-side and the second low-side switches are turned off, and a power adjustment control including: first commutation mode in which the first high-side switch is turned off and the first low-side switch is turned on during the first rectification mode; and second commutation mode in which the second high-side switch is turned off and the second low-side switch is turned on during the second rectification mode.

The invention provides a reliability test system and method, and relates to the field of power devices, the reliability test system can carry out a high-temperature gate bias test and a high-temperature reverse bias test, multiple test modes are realized in one reliability test system, and the test efficiency is improved. Moreover, the reliability test system can apply an alternating signal to the to-be-tested device, thereby truly restoring an actual application scene, and enabling the reliability test system provided by the invention to accurately test the reliability of the power device. After the stress is applied, detection can be carried out immediately, and the relaxation effect of the power device is prevented from influencing the test result. Besides, in the high-temperature gate offset test, the pulse frequency or duty ratio of the electric stress pulse signal can be controlled through the half-bridge circuit, the parameters of the pulse signal can be flexibly changed by the reliability test system for different power devices, and the test applicability is improved.

The invention discloses a driving circuit of a light-emitting fiber array and light-emitting fabric equipment, and relates to the technical field of light-emitting fabric equipment, the driving circuit comprises a power supply module, a control module, a boost circuit, an H-bridge circuit and a switch array, and the switch array is connected with the light-emitting fiber array; the power supply module is connected with the boost circuit and the control module. The boost circuit is connected with the H-bridge circuit. The boost circuit is connected with the H-bridge circuit and is used for boosting input voltage to target voltage and inputting the target voltage into the H-bridge circuit; the control module is connected with the H-bridge circuit and is used for driving the H-bridge circuit to generate positive and negative alternating voltage according to the voltage inversion frequency corresponding to the target overall brightness; and the H-bridge circuit is connected with the luminous fiber array and is used for outputting positive and negative alternating voltage to the luminous fiber array, so that the luminous fiber array emits light according to the target overall brightness. The technical problem that an existing driving circuit for the light-emitting fiber array is low in reliability is solved.

The invention discloses a low-switching-loss unipolar control method for an isolated bidirectional converter. The converter is composed of a direct-current source 1, a primary side full-bridge circuit, a transformer, a series resonance circuit, a secondary side full-bridge circuit and a direct-current source 2. According to the control method, the converter can always work at the resonant frequency point of the series resonant circuit, and bidirectional energy regulation and control can be realized only by adjusting the duty ratio of the switching tubes of the primary side full-bridge circuit and the secondary side full-bridge circuit; in addition, the input and output voltage relation of the resonant converter can be independent of the size and direction of the transmitted power, the bidirectional power rapid regulation and control capability is achieved, the large turn-off current brought by PWM modulation can be effectively reduced by adopting the control method, the average switching frequency in one switching period is reduced, the switching loss is further greatly reduced, and the switching efficiency is improved. The power transmission efficiency is improved, and the device is especially suitable for the technical field of high-performance bidirectional electric energy conversion of energy storage, electric automobiles, new energy and the like.

The invention discloses a bridge and a bridge circuit thereof, the bridge circuit comprises an SPI interface, a bridge conversion chip, an isolation circuit, an enable circuit and a UART interface, the SPI interface is coupled and electrically connected with the bridge conversion chip, and the SPI interface is also electrically connected with an SPI interface of a host of a battery management system. A data port of the bridging conversion chip is coupled and electrically connected with the UART interface through an isolation circuit, the bridging conversion chip is further electrically connected with a data sending port of the UART interface through a corresponding enable circuit, the UART interface is further electrically connected with a UART interface of the AFE, and the host is used for configuring configuration parameters for the UART interface to communicate with the preset AFE; the SPI interface is used for transmitting an SPI signal between the host and the bridging conversion chip; the bridging conversion chip is used for converting UART signals and SPI signals; the isolation circuit is used for carrying out noise interference isolation on the UART signal converted by the bridging conversion chip; the enabling circuit is used for enabling a data sending port of the UART interface; and the UART is used for transmitting a UART signal between the AFE and the bridging conversion chip.

The utility model provides an H-bridge driving circuit, an H-bridge module and electronic equipment, and belongs to the technical field of H-bridge driving, and the H-bridge driving circuit comprises a current detection circuit which is connected with the output end of the H-bridge circuit and a motor driven by the H-bridge circuit in series so as to detect the phase current of the motor and output a current detection signal; the controller is connected with the current detection circuit and responds to the current detection signal to output a first control signal and a second control signal; the first driving circuit is connected with the controller and a P-type tube in the H-bridge circuit, and responds to the first control signal to control the on-off of the P-type tube; and the second driving circuit is connected with the controller and an N-type tube in the H-bridge circuit, and responds to the second control signal to control the on-off of the N-type tube. Through the serially connected current detection circuits, real-time accurate detection of the motor current is realized, and the operation state of the motor is controlled based on the current detection result.

An in-vehicle charging device that includes an AC-DC converter that converts power between AC power on the external AC power supply side and first DC power; and a DC-DC converter that converts power between the first DC power and second DC power on the DC power supply side, wherein the AC-DC converter includes a current source active rectifier having a power factor correct function, the DC-DC converter includes a chopper circuit including a reactor disposed on the AC-DC converter side and a half-bridge circuit disposed on the DC power supply side, the reactor is configured using a plurality of the coils, the half-bridge circuit is configured using the inverter, and the current source active rectifier includes a bidirectional switching device.

The invention relates to an external phase shift angle determination method and system, a frequency conversion phase shift control method and a chip, and the method comprises the steps: obtaining an external phase shift angle based on a general solution of a time domain differential equation of a resonant inductor current and a resonant capacitor voltage of a DBSRC equivalent circuit and the symmetry of the DBSRC equivalent circuit; determining a first current value of the resonant inductor at the first moment and a second current value of the resonant inductor at the second moment; based on the first current value when the primary bridge circuit meets the ZVS soft switching requirement, obtaining a first relational expression of the external phase shift angle about the input voltage and the output voltage of the DBSRC and the switching frequency of the switching tube; based on a second current value when the secondary-side bridge circuit meets the ZVS soft switching requirement, obtaining a second relational expression of the external phase shift angle with respect to the input voltage, the output voltage and the switching frequency; according to the first relational expression, the second relational expression and the steady-state voltage value of the output end of the DBSRC, the expression of the external phase shift angle about the switching frequency, the steady-state voltage value and the input voltage is determined; the scheme is simple, the accuracy is high, and the portability is high.

The invention relates to the field of tension and pressure sensors, in particular to a tension and pressure sensor with a compensation function, which comprises an elastic body, a strain gauge, a compensation gauge and a wiring terminal, the strain gauge and the compensation gauge are respectively arranged on the surface of the elastic body, the strain gauge, the compensation gauge and the wiring terminal are electrically connected through a plurality of high-temperature-resistant cables to form a bridge circuit, at least the strain gauge and the compensation gauge are respectively limited in the first heat insulation layer and the protection layer, and the first heat insulation layer is located between the elastic body and the protection layer. At least a first heat insulation layer used for protection, heat insulation, pressure resistance and sealing is used for wrapping a strain gauge and a compensating gauge which are packaged by a polyimide film and can resist the high temperature of 260 DEG C, so that the actual temperature of the strain gauge and the compensating gauge has a remarkable temperature difference with the current environment temperature; the actual temperature of the strain gauge and the compensating gauge is obviously lower than the environment temperature, so that the strain gauge and the compensating gauge are respectively in an ideal temperature range, and the force measurement precision of the pull pressure sensor is ensured.