176 results about "Triangular wave" patented technology

The invention relates to a magnetotelluric noise suppression method based on ResAtt-CAE, and the method comprises the steps: generating a noise-free signal, adding a noise type into the noise-free signal to construct a noisy signal, and enabling the noisy signal to be matched with the corresponding noise-free signal to form a training set and a test set; designing a ResAtt-CAE model architecture, and realizing cross-level feature fusion by adopting a symmetric structure and jump connection; the ResAtt-CAE model architecture is trained and optimized through the training set and the test set, and the magnetotelluric noise is suppressed through the optimized ResAtt-CAE model architecture. The method is high in noise suppression capability: ResAtt-CAE captures cross-time scale signal features through multi-scale residual learning, enhances effective signal weights in combination with a time domain attention mechanism, and has a remarkable suppression effect on common magnetotelluric noise (square waves, harmonic waves, pulses, triangular waves and the like).

The invention discloses a voltage-to-current circuit, a calibration method, a multi-range calibration method and a power supply, a power amplification unit adopts MOS tubes of different channel types to match with working voltages of opposite polarities, and a bias circuit is combined to superpose exclusive bias, so that the waveform adaptation limitation of a traditional circuit is broken through, and the voltage-to-current conversion efficiency is improved. Alternating current, direct current, triangular waves, square waves and other special waveforms can be stably output, and the adaptability is greatly improved; secondly, pure hardware signal transmission and feedback are carried out in the whole process, the intermediate link of MCU measurement-setting is omitted, multi-stage error accumulation is effectively reduced, output delay is remarkably reduced, and the response speed is higher; in addition, the current sampling feedback unit and the error amplification unit form closed-loop control, power amplification output current is sampled in real time and fed back for calibration, and the precision and stability of the output current are effectively improved. Meanwhile, the bias circuit accurately regulates and controls the conduction state of the MOS tube, the linearity and consistency of current output are improved, and the overall structure is simple and reliable.

The invention discloses an electric linear servo system control method based on cascade LESO-DISMC. The method comprises the following steps: firstly, establishing a complete mechanism model of a permanent magnet synchronous motor servo loading system; then designing DOB interference observer real-time compensation by adopting a LuGre friction model and a gap dead zone model; a feedforward control quantity is constructed by utilizing a measurable displacement signal, and redundant torque is inhibited; designing a dynamic integral sliding mode controller to ensure global stability; a high-low bandwidth LESO is constructed, and both fast tracking and smooth filtering are considered; and finally, trajectory optimization is carried out, a smooth trajectory is generated by adopting polynomial interpolation for the step and triangular wave signals, and mechanical vibration is inhibited. According to the method, a LuGre friction model is adopted to compensate nonlinear friction, cascade linear LESO and sliding mode control are combined, a track is optimized through an S-shaped curve, and the problem of'differential explosion 'is solved; according to the method, instruction smoothing, core control and friction compensation are fused, and the anti-interference capability and the loading precision of the system are improved.

The invention discloses a laser radar and a signal modulation method and device of a silicon light phase shifter, and relates to the technical field of laser radars. The signal modulation method comprises the following steps: providing an initial driving voltage signal for a silicon light phase shifter, so that the silicon light phase shifter modulates a laser signal according to the initial driving voltage signal; obtaining the phase of the laser signal modulated by the silicon light phase shifter; modulating the initial driving voltage signal into a periodic modulation voltage signal according to the phase of the laser signal; acquiring a modulation slope corresponding to the modulation voltage signal of each period; performing waveform modulation on the modulation voltage signal according to the modulation slope corresponding to the modulation voltage signal of each period to determine a modulation driving voltage signal; providing the modulation driving voltage signal to a silicon light phase shifter, so that the silicon light phase shifter modulates the laser signal according to the modulation driving voltage signal, and determining a modulation laser signal; and the frequency of the modulated laser signal is linearly changed in a triangular wave form along with time. According to the invention, the measurement precision of the laser radar is improved.

The invention relates to the technical field of geotechnical engineering anchoring, in particular to a method for testing the degradation characteristic of the bearing performance of a recyclable anchor rod under cyclic loading. The method comprises the following steps: preparing a unit body sample anchor-rock interface unit body sample, simulating weathered soft rock according to a specific ratio, pouring a self-compacting concrete anchoring body, and curing and forming; setting a combined parameter of a reference load ratio and a load cycle index, applying a triangular wave cyclic load to simulate a traffic condition, and executing a pull-out test to collect load-displacement data; constructing a two-parameter coupled shear strength degradation model based on test data, and proposing a shear stress-displacement curve model; an anchor rod load transfer control equation is established in combination with the Poisson effect, and shear stress distribution of the anchoring section is iteratively solved by adopting a discrete recursion method; the model is verified through a foundation pit engineering case, the ultimate bearing capacity degradation law of the anchor rod under long-term cyclic loading is predicted, and it is proved that the model can guide engineering safety design. According to the method, the coupling characterization of the cyclic load parameter and the interface degradation mechanism is realized.

An electronic device may include an inverter. The inverter may receive switching signals based on a dithered clock signal and output corresponding alternating current signals to a wireless power transfer coil. The dithered clock signal may have a plurality of frequency steps during a repeated cycle of the dithered clock signal. The repeated cycle of the dithered clock signal may comprise a step function that approximates a triangular waveform with steps having unique frequency magnitudes during the repeated cycle.

The invention discloses a trapezoidal wave current soft switching method of an interleaving DC-DC converter, which is used for a two-phase interleaving bidirectional DC-DC converter based on a coupling inductor and a multi-phase interleaving converter thereof, and is characterized in that an inductive current adopts a trapezoidal wave mode, so that the converter works in an approximate critical conduction mode; a fixed switching frequency control or hybrid control method is adopted, so that the device can work in a Buck mode and can also work in a Boost mode. The method for realizing the soft switching is characterized in that the parasitic capacitance or the external resonant capacitor of the switching tube is discharged to be zero under the resonance action of the inductor and the capacitor in the dead zone time when the upper bridge arm switch and the lower bridge arm switch are alternately switched on, so that the zero-voltage switching-on of all the switching tubes is realized. And each phase current sharing control is adopted in the multi-phase interleaving parallel topological structure. According to the invention, the problems of large current peak value and high turn-off loss of a traditional triangular wave current mode are solved, the output ripple current is reduced, a soft switching method is provided, the switching loss is reduced, and the conversion efficiency of the converter is improved.

The invention provides a digital isolator with both high-speed communication and high common-mode transient immunity. The digital isolator comprises a transmitter, a coupling inductor and a receiver, the transmitter comprises an oscillator, a modulation capacitor assembly and a common-mode transient immunity enhancement module; the oscillator is configured to receive a data signal and generate a first differential signal based on the data signal; the modulation capacitor assembly is configured to modulate a code element 0 into a first frequency and modulate a code element 1 into a second frequency; the common-mode transient immunity enhancement module is configured to determine a bias control signal according to the first differential signal; the receiver is configured to receive the second differential signal and obtain a square wave signal based on the second differential signal; obtaining a triangular wave signal based on the square wave signal; obtaining the maximum value of a triangular wave signal according to the falling edge signal of the square wave signal; and obtaining a target data signal based on the maximum value, so as to solve the problem of low communication and common-mode transient immunity performance of the existing digital isolator.

A method and system delivers customizable microcurrent stimulation to ocular tissue using a three half-bridge driver circuit. The system includes a control circuit that selectively switches high-side and low-side transistors, such as MOSFETs, to generate various electrical waveforms, such as stepped, asymmetric biphasic, pulsed, and triangular waveforms. These waveforms are applied to electrodes in contact with the eye for therapeutic treatment, addressing conditions like age-related macular degeneration (AMD) and other ocular disorders. The system allows for adjustments in amplitude, frequency, and duration of the waveforms, providing personalized treatment protocols tailored to patient-specific needs. High-impedance periods are included between pulses to promote tissue recovery and enhance patient comfort. Additionally, a non-transitory computer-readable storage medium stores a program that controls the system, enabling real-time waveform generation and dynamic adjustment during treatment. This approach offers a flexible and efficient solution for ocular therapy, improving both treatment outcomes and patient experience.

The invention relates to the technical field of integrated circuits, and discloses a double-feedback loop spread spectrum phase-locked loop circuit. The circuit comprises a clock generation phase-locked loop and a spread spectrum signal generation loop. The clock loop generates and locks the center frequency. The spread spectrum loop adopts a time length locking principle, a fixed reference time T4 is set through a digital parameter SSR, and a feedback counter is used for measuring an output clock period to obtain a feedback time T6. The error between the T4 and the T6 is compared, the error is converted into a triangular wave modulation voltage through a charge pump and a modulation signal generator, and after superposition, a voltage-controlled oscillator is controlled to realize frequency modulation. The spread spectrum depth is directly and accurately controlled through pure digital parameters, the problems that modulation precision of a traditional scheme depends on analog gain, is limited by loop bandwidth and is complex in circuit design are solved, high-precision, programmable and stable spread spectrum clock generation is achieved, system electromagnetic interference is remarkably reduced, and the method is suitable for a high-integration-level communication chip.

The invention provides a tunnel blasting equivalent load prediction method and system based on an artificial neural network for tunnel blasting dynamic response rapid evaluation. The method comprises the following steps: firstly, establishing engineering parameters for describing a single-hole blasting working condition of a tunnel, and converting the engineering parameters into dimensionless input parameter vectors; aiming at continuity parameters and grading parameters, generating sample working conditions by adopting an orthogonal test and Latin hypercube combined sampling mode, carrying out numerical simulation on each working condition, extracting a blasting triangular wave speed-time history curve of a representative measuring point in the model, and establishing a blasting triangular wave speed-time history curve with engineering parameters of a single-hole blasting working condition as input; the database takes blasting triangular wave parameters as output; an artificial neural network is trained under the loss function, rapid prediction of triangular wave parameters is achieved, and triangular waves can serve as blasting equivalent load time history to be applied to the normal direction of the plane where representative measuring points are located and used for tunnel blasting dynamic response calculation. According to the method, the calculation cost and the modeling complexity can be remarkably reduced, and the numerical calculation stability and the engineering applicability are improved.

The invention relates to a control circuit for a switching circuit. The switching circuit receives an input signal and converts the input signal into an output current flowing through an LED load by controlling on and off of at least one switch. Wherein the control circuit comprises an error amplification circuit, a current control circuit and an overcurrent control circuit, and the error amplification circuit receives a detection signal representing output current and a reference signal and compares the detection signal with the reference signal to generate a current control signal. The current control circuit receives a current control signal and a triangular wave signal, and generates a switch control signal according to the current control signal and the triangular wave signal to control the on and off of the at least one switch. The over-current control circuit controls the current control signal according to a comparison result of the detection signal and the over-current signal, and when the detection signal is larger than the over-current signal, the current control signal is reduced to a preset voltage. According to the technical scheme, rapid adjustment of the output current when the load LED changes is achieved, and the reliability and the service life of the LED are effectively improved.

Providing technology that can suppress the sound of teeth clicking. [Solution] A motor control device comprises a transmission, a first gear connected to the output shaft of the transmission, a motor, a second gear connected to the output shaft of the motor and meshing with the first gear, and a control unit that controls the motor based on a first gear waveform corresponding to a torque waveform input to the first gear, such that the second gear waveform corresponding to a torque waveform input to the second gear is in phase with the first gear waveform, wherein the control unit controls the motor so that the second gear waveform is a triangular wave.

The invention provides a control method, a storage medium, a full-bridge inverter and electronic equipment, and the control method is applied to the full-bridge inverter, and comprises the steps: controlling the full-bridge inverter based on a triangular wave mode of an inductive current; a compensation current value is obtained, wherein the compensation current value is a negative current increment caused by full-bridge inverter inductive current falling edge sampling calculation delay; and compensating a preset extreme value of the inductive current of the full-bridge inverter based on the compensation current value. According to the control method provided by the embodiment of the invention, the compensation current is obtained based on the negative current increment caused by the full-bridge inverter inductive current falling edge sampling calculation delay, the preset extreme value of the inductive current is compensated, the negative current influence caused by the inductive current falling edge sampling calculation delay is counteracted, and the inverter efficiency and the current quality are improved.

The invention discloses a temperature isolation sampling circuit, and relates to the field of electronic circuit design, and the circuit comprises a triangular wave circuit which generates a triangular wave with a fixed period according to a threshold value comparison result in a capacitor charging and discharging mode; the temperature sampling circuit is used for comparing the sampling voltage which is output by the thermistor voltage division circuit and changes along with the temperature with the triangular wave and outputting a PWM (Pulse Width Modulation) square wave signal of which the duty ratio changes along with the temperature; and configuring an optocoupler device to work in a switching state based on a non-linear region, and transmitting the PWM square wave signal to an isolation output circuit at a low-voltage side to realize electrical isolation transmission. The device supports electrical isolation and adapts to high-voltage occasions, and the isolation voltage range depends on selected isolation elements; according to the invention, the PWM is used for transmitting the temperature signal, when the temperature signal is interfered by an electromagnetic environment, the influence on the level amplitude does not change the duty ratio, and in addition, the cost of the device is also reduced.

The invention relates to the technical field of pulse width modulation, and discloses a frequency conversion critical triangular wave pulse width modulation method and device, and the method comprises the steps: obtaining the overlapping conduction time of two lower tubes of a secondary side of a dual-active bridge converter, and enabling the overlapping conduction time to be obtained through current closed-loop control; judging whether the switching period exceeds a preset time threshold value or not according to the overlapped conduction time and the inductor follow current time; and if the switching period exceeds the preset time threshold value, converting the preset time threshold value and the overlapping conduction time into a duty ratio and a frequency, and then carrying out frequency conversion critical triangular wave pulse width modulation on the dual-active bridge converter. According to the technical scheme, the frequency variable can be introduced, so that the inductive current triangular wave stably works in a critical continuous state all the time. The power is improved through the synergistic effect of frequency conversion and peak current increase, and meanwhile, the increment influence of the stage that the inductive current is reduced to 0 on the peak current is counteracted through frequency compensation, so that the turn-off loss at the inductive peak current is greatly reduced, and the heating problem of a system switch tube is effectively relieved.

The drive device includes: a motor; an inverter that drives the motor; and a control device that sets a three-phase voltage command on the basis of a torque command of the motor, generates a three-phase PWM signal by comparing a three-phase voltage command-related value associated with the three-phase voltage command with the triangular wave, and controls the inverter. In this case, when the difference between the two-phase voltage command-related values among the three-phase voltage command-related values is equal to or less than a prescribed difference, the control device corrects the voltage command-related values so that the latter one of the crossing timings of the two-phase voltage command-related values and the triangular waves is further delayed.

The invention relates to a voltage conversion circuit and energy storage equipment. The voltage conversion circuit comprises a first control module, a second control module, a temperature sensing element, an energy storage element and a logic module. The resistance value of the temperature sensing element is in positive correlation with the temperature parameter of the voltage conversion circuit. And the first control module is used for conducting a charging path from the input power supply and the temperature sensing element to the energy storage element under the condition that the first control module is in the conducting state. The second control module is used for controlling the first control module to disconnect the charging path and conducting a discharging path between the second control module and the energy storage element under the condition that the charging voltage of the energy storage element reaches a first preset voltage, so that the energy storage element discharges through the discharging path; a triangular wave voltage signal of the first end of the temperature sensing element is obtained based on the charging and discharging process of the energy storage element. And the logic module is used for converting the triangular wave voltage signal into a PWM signal. By adopting the voltage conversion circuit, the temperature stability can be improved.

The invention provides a sensorless control method for a permanent magnet synchronous motor based on high-frequency triangular wave signal injection of a random slope. The sensorless control method comprises the following steps: forming a high-frequency triangular wave voltage injection signal of the random slope; injecting the high-frequency triangular wave voltage injection signal into the permanent magnet synchronous motor in a low-speed operation interval of the permanent magnet synchronous motor, and extracting a current response signal; performing high-pass filtering on the extracted current, extracting a high-frequency response current envelope containing rotor position information from the filtered high-frequency response current by using a demodulation signal, and performing low-pass filtering; and extracting rotor position and rotating speed information from the high-frequency response current envelope by using a normalized phase-locked loop structure, and performing closed-loop control of sensorless control of the permanent magnet synchronous motor by taking the extracted information as a feedback signal. According to the technical scheme, through random slope triangular wave signal injection, the current spectrum is uniformly distributed, sharp noise is converted into white noise, and the acoustic performance is improved.

This power conversion device turns on / off a semiconductor switching element (Q), thereby converting a DC voltage into an AC voltage, supplying the AC voltage to a rotating machine, and performing variable speed driving of the rotating machine. The power conversion device comprises a drive controller (10) that generates: a first command that is the voltage command of a target voltage of the AC voltage; and a gate signal for turning on / off the semiconductor switching element by comparing a second command with the carrier signal of a triangular wave. The drive controller (10) is configured to: generate the carrier signal of the triangular wave having a frequency of integer Kc times the frequency of the fundamental wave component of the first command; and to generate the second command by changing the second command in accordance with the rotational speed of the rotating machine so that a harmonic component included in the waveform of the gate signal and has a specific order with respect to the frequency of the fundamental wave component of the first command is reduced.

The application discloses a permanent magnet synchronous motor parameter identification method based on triangular wave injection and relates to the technical field of motor control. A triangular wave with a direct current bias is injected into the d-axis current of the motor. In the identification equation of the autoregressive least square algorithm, the current differential term in the voltage equation of the permanent magnet synchronous motor is considered. Two groups of input data with low linear correlation are combined into a new equation group. The parameters of the motor are divided into two sections, the new equation group is used for identification, and an identification result is output. The segmented autoregressive least square method parameter identification based on triangular wave injection can realize real-time identification of the resistance, inductance and flux linkage of the motor when the motor is in steady operation, so that the control performance of the double closed loop vector control of the permanent magnet synchronous motor is further improved.

The invention relates to the technical field of laser frequency locking, and provides a method and system for laser frequency locking, the system comprises an MCU, a high voltage amplification module, a PZT cavity length adjusting module, a laser and a PD monitoring module, the MCU is used for outputting a triangular wave scanning signal, and collecting an error signal and a transmission spectrum signal through two ADC channels; the high-voltage amplification module is used for receiving the triangular wave scanning signal and outputting a high-voltage signal; the PZT cavity length adjusting module is used for receiving the high-voltage signal and changing the cavity length; the laser is used for generating a transmission spectrum signal and an error signal according to cavity length change; the PD monitoring module is used for collecting a transmission spectrum signal and an error signal generated by the laser and outputting the signals to the MCU. According to the invention, the automation degree and stability of frequency locking control of the laser are improved, and high-efficiency target band output of the laser is realized.

A power controller and a control method for a power converter with soft turn-on and soft turn-off. The power converter includes an inductor element and a power switch for controlling an inductor current flowing through the inductor element. The power controller includes a voltage mode controller and a current mode controller. The voltage mode controller controls an on-time of the power switch based on a feedback signal and a sawtooth signal. The feedback signal is generated based on an output voltage of the power converter. The current mode controller controls the on-time based on a current limit signal and a current sense signal to limit the current sense signal. The current sense signal represents the inductor current. The current mode controller includes a limit signal generator for providing the current limit signal based on the feedback signal and a triangular wave signal and determining a soft turn-on time and a soft turn-off time. The limit signal generator increases the current limit signal over time during the soft turn-on time and decreases the current limit signal over time during the soft turn-off time.

The invention belongs to the technical field of marine electromagnetic geophysical prospecting, and relates to a design method of a marine electromagnetic method multi-waveform combined transmitting circuit, the transmitting circuit comprises a transmitting bridge arm, a resonance branch, an absorption branch and a transmitting coil, direct-current voltage provided by a direct-current power supply E can be inverted and converted into alternating-current voltage, and the alternating-current voltage is loaded at the two ends of the transmitting coil; therefore, alternating current is excited in the transmitting coil, and a primary detection electromagnetic field is formed in a detection area. The circuit is wide in detection range and high in efficiency; an all-solid-state IGBT switch structure is adopted, multi-waveform combined emission is achieved under the condition of a more compact structure and fewer switching devices, higher switching efficiency and smaller system size are achieved, and the multi-waveform combined emission device is more suitable for an electromagnetic emission system instrument in a seabed high-pressure complex environment; the invention provides a topological structure of a multi-waveform combination transmitting circuit, constructs a waveform combination generation principle of a half-sine wave and a triangular wave, establishes a second-order RLC equivalent circuit model, and provides a control signal working time sequence of the transmitting circuit.

This application discloses a low-power temperature-compensated RC oscillator, comprising a low-voltage linear buffer, an RC core circuit, a comparator, a Schmitt trigger, a non-overlapping clock generator, and a level shifter. The low-voltage linear buffer uses intrinsic transistors to reduce operating voltage and power consumption; the RC core circuit employs temperature compensation technology, including a series low-temperature drift resistor and a temperature-dependent current source, causing the equivalent resistance to increase with temperature; the comparator compares a triangular wave signal with a reference voltage and outputs a reference clock; the Schmitt trigger filters out clock glitches; the non-overlapping clock generator generates a two-phase clock with dead time to control charging and discharging; and the level shifter converts the low-voltage domain clock to the high-voltage domain. This oscillator eliminates the influence of comparator offset voltage through two-phase switching control and employs low-voltage and temperature compensation technology to achieve a high-precision, low-temperature drift reference frequency in a small area with low power consumption, making it suitable for compact sensing and measurement systems.

The application provides a multi-phase pulse width modulation method for reducing harmonics of a class-D power amplifier and related equipment, and relates to the field of broadcast television.The method comprises the following steps: sampling an original audio signal at a preset sampling rate to obtain a sinusoidal audio signal; generating a plurality of triangular wave signals corresponding to the sinusoidal audio signal at a preset frequency multiple; performing amplitude comparison between the sampling signal and each triangular wave signal to obtain a pulse width modulation signal corresponding to each triangular wave signal; superimposing the plurality of pulse width modulation signals to obtain a superimposed signal; and inputting the superimposed signal into the class-D power amplifier to obtain a power amplifier output signal with reduced harmonics. By implementing the method, the performance requirement of a low-pass filter in the latter stage can be reduced, so that the suppression of harmonic distortion of the output signal is realized without increasing the cost and complexity of the filter.

The utility model relates to the technical field of power electronics, and discloses a signal generating circuit which comprises a square wave generating circuit, a triangular wave generating circuit and a trapezoidal wave generating circuit, an external power supply voltage is input into the power supply end of the square wave generating circuit, and a driving signal is input into the input end of the square wave generating circuit. The output end of the square wave generation circuit is connected with the input end of the triangular wave generation circuit; the output end of the triangular wave generation circuit is connected with the input end of the trapezoidal wave generation circuit, a first power supply end of the triangular wave generation circuit inputs first power supply voltage, and a second power supply end of the triangular wave generation circuit inputs external power supply voltage; the power supply end of the trapezoidal wave generation circuit inputs second power supply voltage; the external supply voltage is greater than the second supply voltage. The signal generating circuit is high in reliability, high in integration level and suitable for multi-path output scenes.

The invention provides a grounding grid high-frequency impedance analysis method and device and electronic equipment, and relates to the technical field of power systems and electric measurement. The method comprises the steps that a triangular wave excitation signal is acquired, and the triangular wave excitation signal is an even symmetric triangular wave signal constructed based on preset fundamental wave frequency and amplitude and is used for being injected into a grounding grid; based on the triangular wave excitation signal, response signals of the grounding grid at a plurality of measurement points are obtained, and the response signals comprise a high-frequency voltage signal and a high-frequency current signal; and based on the response signal and the distribution parameter model, determining an input impedance spectrum of the grounding grid, the input impedance spectrum being used for evaluating a high-frequency impedance characteristic of the grounding grid. The method is used for improving the comprehensiveness and accuracy of high-frequency characteristic analysis, so that the analysis result can accurately reflect the impedance change rule of the grounding grid in a high-frequency band, and a more reliable evaluation basis is provided for safe operation of a power system.

To provide a reservoir computer with low power consumption by controlling a period during which voltage is applied to a drain.SOLUTION: A reservoir computer is provided, comprising: a FeFET of which a gate electrode is connected to a gate voltage generation circuit that inputs gate voltage in the form of a triangular wave with peaks of positive voltage and negative voltage to the gate electrode and of which a drain is connected to a sense circuit that applies drain voltage and detects a drain current by converting it from analog to digital; and a first switch arranged between the sense circuit and the drain. The gate voltage generation circuit includes a charge pump circuit for applying positive voltage, a charge pump circuit for applying negative voltage, a pulse generation circuit, and a Vref regulator.SELECTED DRAWING: Figure 4

The application discloses a control system of a pulse sequence control triangular wave current mode soft switching Buck converter, the Buck converter comprises a direct current input power supply, a first switching tube, a second switching tube, an inductor, an output capacitor and a load, the positive pole of the direct current input power supply is connected with one end of the second switching tube and one end of the inductor through the first switching tube, the other end of the inductor is connected with one end of the output capacitor and one end of the load, the other end of the output capacitor, the other end of the load and the other end of the second switching tube are connected with the negative pole of the direct current input power supply, and the control system comprises a PT controller, a voltmeter for detecting and collecting a voltage signal between the load and a current meter for collecting an inductor current, wherein the input end of the PT controller is connected with the output end of the current meter and the output end of the voltmeter, the output end of the PT controller is connected with the control end of the first switching tube and the control end of the second switching tube, and the control system can control the size of negative current and has a relatively simple structure.