A circuit for adaptively adjusting a drive signal

Abstract

The application discloses a kind of self-adapting adjustment drive signal circuit, for the problems of existing technology load mutation software compensation exists inherent delay, hardware compensation scene adaptability is poor, cannot realize transient current same period compensation, designed full hardware closed loop collaborative processing link.The application acquires load loop instantaneous current by current transient sampling module, extracts current rate of change di / dt characteristics by current rate of change detection module, is triggered accurately by threshold trigger module in combination with system working condition, then generates matching compensation signal by adaptive compensation generation module fusion multidimensional information, finally by drive signal modulation and output module in the same switching cycle, drive signal adaptive adjustment is completed.The application full link has no software algorithm intervention, greatly reduces response delay, can be widely adapted to various power drive scenes, and gives consideration to system transient response performance, load capacity and full working condition operation stability.

Description

Technical Field

[0001] This invention belongs to the field of power electronics and power drive control technology, and relates to a circuit for adaptively adjusting drive signals. Background Technology

[0002] In power drive and power conversion systems, sudden load changes, especially large load step changes, can cause transient large fluctuations in the power loop current, directly leading to a mismatch between the drive signal and the load conditions. This can result in problems such as overcurrent damage to power devices, significant drops / overshoots in output voltage, system loop oscillations, and a severe decrease in power supply accuracy.

[0003] In the existing technology, there are relevant studies on drive signal compensation schemes for load fluctuations, as detailed below: Chinese invention patent CN108429468B discloses a synchronous rectifier controller and circuit using it that adaptively adjusts the drive voltage. This solution generates an adjustment signal by sampling the secondary winding voltage of the transformer, and adaptively adjusts the drive voltage of the synchronous rectifier tube to avoid turn-off delay. However, this solution is only for synchronous rectification scenarios of flyback converters, relies on transformer winding voltage sampling, and cannot be adapted to general power drive systems such as switching power supplies, motor drives, and constant current sources. Furthermore, it can only adjust the drive voltage based on the steady-state value of the MOSFET's on-state voltage drop, lacks a current change rate trend prediction mechanism, and cannot cope with microsecond-level transient current fluctuations caused by load changes, resulting in inherent lag in compensation.

[0004] Chinese invention patent CN103440008B discloses an output voltage regulation adaptive load circuit. This scheme adjusts the feedback loop of the voltage regulation module by picking up the load signal to achieve adaptive adjustment of the output voltage according to the load change. However, this scheme can only adjust the output voltage based on the steady-state change of the load resistance, and lacks real-time detection and same-period compensation mechanism for transient current fluctuations. The response speed is slow and it cannot cope with transient current spikes caused by load changes. Moreover, it can only achieve open-loop adjustment of the output voltage, and lacks a closed-loop drive signal real-time modulation link, which cannot suppress subharmonic oscillations and loop instability caused by load changes.

[0005] Chinese invention patent CN120934146B discloses a circuit and method for realizing adaptive load control in a power supply management system (BMS). This scheme modulates the drive signal of an AFE chip using a PWM signal output by an MCU to achieve adaptive load adjustment of the BMS. However, this scheme relies on the MCU's software algorithm calculation and PWM modulation, which has an inherent delay due to software loops. The overall response time is mostly in the tens of microseconds range, making it impossible to achieve same-cycle compensation for load current fluctuations. Furthermore, it can only achieve average power regulation of the discharge current and cannot perform real-time adaptive adjustment of the drive signal of the power switching devices at the nanosecond level, thus failing to suppress transient current spikes and output voltage fluctuations.

[0006] In summary, existing compensation schemes all suffer from the following core defects: First, software compensation schemes have inherent delays and cannot achieve same-cycle compensation for transient load fluctuations; second, hardware compensation schemes have poor scenario adaptability, only able to achieve steady-state compensation for specific scenarios, and cannot cope with dynamic load changes across all operating conditions and scenarios; third, the functional links are fragmented, with no coordinated interaction between the sampling, triggering, compensation, and modulation modules, failing to form a closed-loop real-time processing link. This results in either untimely compensation, insufficient compensation accuracy, or weakened system load-carrying capacity, making it impossible to simultaneously consider transient response, load-carrying capacity, and stability under all operating conditions. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the present invention provides a circuit for adaptively adjusting the driving signal.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A circuit for adaptively adjusting a drive signal, applied to a power drive system, includes a current sampling unit connected to the main power circuit of the load, a drive output unit that receives the original drive signal of the system and outputs the drive signal to the power switching device, and further includes a current change rate detection module, a threshold trigger module, and an adaptive compensation generation module that sequentially form a hardware closed-loop signal link.

[0009] The current sampling unit is a transient current sampling module. Its input terminal is connected in series to the main load power circuit, its first output terminal is electrically connected to the input terminal of the current change rate detection module, its second output terminal is electrically connected to the load tracking compensation subunit of the adaptive compensation generation module, and its third output terminal is electrically connected to the system overcurrent protection module. It is used to collect the instantaneous current full waveform information of the load power circuit in real time, output a current sampling signal that is linearly corresponding to the instantaneous current without phase delay, and synchronously shunt it to the three downstream related modules.

[0010] The output of the current change rate detection module is divided into two paths. The first path is electrically connected to the first input of the threshold trigger module, and the second path is electrically connected to the segmented compensation amount generation subunit of the adaptive compensation generation module. It is used to perform hardware differentiation processing on the received current sampling signal, extract and output the current change rate di / dt signal that represents the load change trend in real time, and synchronously split it to the threshold trigger module and the adaptive compensation generation module.

[0011] The second input terminal of the threshold trigger module is connected to the original drive signal of the system. The first output terminal is electrically connected to the enable terminal of the adaptive compensation generation module. The second output terminal is electrically connected to the enable terminal of the drive output unit. The third output terminal synchronously outputs the interval selection signal corresponding to the trigger level to the segmented compensation amount generation subunit of the adaptive compensation generation module. It is used to receive the current change rate di / dt signal and the original drive signal, detect the system working duty cycle in real time and dynamically adjust the trigger threshold. When the current change rate di / dt signal exceeds the preset threshold range of the corresponding working condition, it outputs the corresponding level of trigger enable signal and synchronously wakes up the compensation link.

[0012] The third input terminal of the adaptive compensation generation module is connected to the original drive signal of the system, and the output terminal is electrically connected to the compensation signal input terminal of the drive output unit; it is used to synchronously fuse the current change rate di / dt signal, the real-time duty cycle signal of the system, and the load static current signal after receiving the trigger enable signal to generate a drive compensation signal that is linearly matched with the current fluctuation.

[0013] The drive output unit is a drive signal modulation and output module. Its original signal input terminal is connected to the original drive signal of the system, and its output terminal is electrically connected to the drive electrode of the power switching device. It is used to perform hardware real-time synchronous modulation of the original drive signal and the drive compensation signal under the control of the trigger enable signal, and output the adaptively adjusted drive signal to the power switching device to complete the closed-loop compensation of load current fluctuation.

[0014] Furthermore, the current transient sampling module adopts a differential sampling architecture, including a high-precision sampling resistor, a differential high-speed operational amplifier unit, and a low-pass filter subunit. The high-precision sampling resistor is connected in series in the main power circuit of the load, and the differential input terminal of the differential high-speed operational amplifier unit is connected in parallel across the two ends of the high-precision sampling resistor, with a bandwidth ≥10MHz and a common-mode rejection ratio ≥80dB. The input terminal of the low-pass filter subunit is electrically connected to the output terminal of the differential high-speed operational amplifier unit, and the output terminal is a three-way synchronous output terminal, realizing the sharing of multi-link synchronous signals at a single sampling point.

[0015] Furthermore, the current change rate detection module includes a hardware differentiating circuit, a phase compensation subunit, and a peak detection subunit connected in sequence. The hardware differentiating circuit performs real-time differentiating operations on the current sampling signal, the phase compensation subunit corrects the signal phase offset, and the peak detection subunit outputs a peak-hold di / dt signal. It also has a built-in hardware reset circuit, which is controlled by the output signal of the threshold trigger module to ensure that the peak signal is updated synchronously with the real-time current change rate.

[0016] Furthermore, the threshold triggering module is a multi-window segmented window comparator circuit with built-in di / dt thresholds for four load intervals. Each interval is configured with independent positive / negative thresholds and an adjustable hysteresis window. It also integrates a hardware duty cycle detection subunit, which can dynamically adjust the threshold according to the real-time duty cycle of the system. The larger the duty cycle, the lower the absolute value of the threshold and the higher the trigger sensitivity, thus suppressing subharmonic oscillations under high duty cycle conditions in advance.

[0017] Furthermore, the adaptive compensation generation module includes a segmented compensation amount generation subunit, an anti-slope compensation subunit, a load tracking compensation subunit, and a signal superposition subunit. The segmented compensation amount generation subunit generates a basic compensation amount that matches di / dt based on the interval gating signal. The anti-slope compensation subunit generates a negative DC compensation amount that matches the duty cycle to ensure the system's load-carrying capacity. The load tracking compensation subunit generates a gain calibration amount based on the static load. Finally, the signal superposition subunit completes the linear superposition of the three signals and outputs the final drive compensation signal.

[0018] Furthermore, the drive signal modulation and output module includes a modulation subunit, a drive buffer subunit, and a current buffer compensation subunit. The modulation subunit supports three hardware modulation modes: duty cycle, amplitude, and edge slope, and can be configured via hardware pins to adapt to different scenarios. The drive buffer subunit adopts a super source follower architecture to reduce output impedance and improve the driving capability of large capacitive loads. The current buffer compensation subunit suppresses the Miller effect in the drive link and improves the loop phase margin and stability.

[0019] Furthermore, this circuit also includes auxiliary function modules, specifically a reference source module, a soft-start module, an overcurrent protection module, and an overtemperature protection module, which provide the entire system with reference power supply, power-on soft start, hardware overcurrent protection, and overtemperature protection functions, thereby improving the reliability of system operation.

[0020] The present invention also provides a power drive system, including a main control unit, a power switch unit, a load, and the aforementioned adaptive adjustment drive signal circuit; the original drive signal output terminal of the main control unit is electrically connected to the corresponding input terminals of the threshold trigger module, the adaptive compensation generation module, and the drive signal modulation and output module of the circuit, respectively; the output terminal of the circuit is electrically connected to the drive electrode of the power switch unit; the power switch unit and the load are connected in series to the main power circuit; and the current transient sampling module is connected in series in the main power circuit.

[0021] Furthermore, the power drive system is any one of a DC / DC switching power supply system, a motor drive system, a constant current source power supply system, a flyback converter system, and a BMS discharge control system; the load is any one of a resistive load, an inductive load, and a capacitive load.

[0022] In summary, the advantages of this invention are: This invention constructs a fully hardware closed-loop collaborative system. Through synchronous signal distribution, sharing of operating condition information, and coordinated action triggering, it achieves signal processing without software intervention across the entire link, significantly reducing the overall response delay of analog circuit solutions. Compared with traditional algorithm compensation solutions, the response speed is improved by more than two orders of magnitude. It realizes real-time compensation of large load current fluctuations in the same period and completely solves the core problems of multi-period delay and untimely compensation in software algorithms.

[0023] This invention provides forward-looking compensation based on di / dt trend prediction, replacing traditional post-event amplitude correction. By extracting the current change rate di / dt in real time through a hardware differentiating circuit, this invention captures the trend characteristics of load abrupt changes, rather than simply detecting changes in current amplitude. This enables advance prediction and compensation for load abrupt changes, rather than post-event correction after current amplitude exceeds limits, effectively suppressing problems such as current spikes, output voltage drops / overshoots, etc. Attached Figure Description

[0024] Figure 1 This is a block diagram of the overall closed-loop architecture of the adaptive adjustment drive signal circuit of the present invention.

[0025] Figure 2 This is a schematic diagram of a transient current sampling module.

[0026] Figure 3 This is a schematic diagram of the current change rate detection module.

[0027] Figure 4 This is a schematic diagram of the threshold triggering module.

[0028] Figure 5 The schematic diagram for the adaptive compensation generation module.

[0029] Figure 6 This is a schematic diagram of the drive signal modulation and output module.

[0030] Figure 7 This is a typical application topology diagram of a power drive system. Detailed Implementation

[0031] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0032] Example 1 This embodiment is an analog, fully hardware-adaptive adjustment circuit for drive signals, suitable for low-to-medium power scenarios, such as DC constant current sources for geological exploration, low-to-medium power DC / DC switching power supplies, and small motor drives. It is especially optimized for inductive loads and long cable power supply scenarios. The entire circuit is built using general-purpose analog components, requiring no digital chips, and is low-cost and easy to implement, with a full-link response delay of ≤300ns.

[0033] like Figure 1 As shown, the adaptive adjustment circuit of the drive signal in this embodiment includes a current transient sampling module, a current change rate detection module, a threshold triggering module, an adaptive compensation generation module, a drive signal modulation and output module, and a supporting auxiliary function module, which sequentially form a hardware closed-loop signal link.

[0034] like Figure 2 As shown, the transient current sampling module adopts a differential sampling architecture, including a high-precision sampling resistor Rsen, a differential high-speed operational amplifier unit U1, and a low-pass filter subunit. The high-precision sampling resistor Rsen is a 10mΩ / 1% / 25ppm low-temperature drift precision resistor, connected in series with the ground terminal of the load power main circuit. The differential high-speed operational amplifier unit U1 uses a dual-channel high-speed operational amplifier AD8065 with a bandwidth of 180MHz, a slew rate of 130V / μs, and a common-mode rejection ratio of 90dB, forming a differential amplifier circuit with a gain of 10. The low-pass filter subunit consists of a 1kΩ resistor Rf and a 1000pF capacitor Cf forming an RC low-pass filter with a cutoff frequency of 160kHz, filtering out high-frequency switching noise. The output of the low-pass filter subunit is divided into three paths: the first path connects to the input of the current change rate detection module, the second path connects to the load tracking compensation subunit of the adaptive compensation generation module, and the third path connects to the overcurrent protection module, realizing single-sampling-point multi-link synchronous signal sharing.

[0035] like Figure 3As shown, the current change rate detection module includes a hardware differentiating circuit, a phase compensation subunit, and a peak detection subunit connected in sequence. The hardware differentiating circuit consists of a high-speed operational amplifier U2 (AD8065), a differentiating capacitor Cd=1000pF, and a differentiating resistor Rd=1kΩ. It performs real-time differentiating operations on the current sampling signal and outputs the initial current change rate signal. The phase compensation subunit consists of a 51Ω resistor Rc and a 220pF capacitor Cc connected in series. It is connected in series at the output of the hardware differentiating circuit. The corner frequency is set to 5 times the system switching frequency, and the phase compensation is ≥45° to ensure that the phase difference between the di / dt signal and the load current fluctuation is ≤5°. The peak detection subunit consists of a high-speed Schottky diode D1, a 10nF holding capacitor Ch, and a voltage follower U3. It captures the transient peak value of the current change rate and outputs a peak-hold di / dt signal. The peak detection subunit incorporates a hardware reset circuit composed of an NMOS transistor Qr. The gate of Qr is connected to the output of the threshold trigger module, its drain is connected to the positive terminal of the holding capacitor Ch, and its source is grounded. When the trigger enable signal is invalid, Qr conducts, discharging and resetting the holding capacitor Ch, ensuring that the peak signal is updated synchronously with the real-time current change rate. The output of the peak detection subunit is divided into two paths: the first path is connected to the input of the threshold trigger module, and the second path is connected to the segmented compensation amount generation subunit of the adaptive compensation generation module.

[0036] like Figure 4 As shown, the threshold triggering module is a four-window segmented window comparator circuit, integrating a hardware duty cycle detection subunit. The four-window comparator uses four high-speed comparators U4 (LMV7219), with built-in di / dt thresholds for four load ranges: light load, medium load, heavy load, and large load abrupt change, respectively ±50V / μs, ±200V / μs, ±500V / μs, and ±1000V / μs. Each comparator is configured with a 100mV hysteresis window to suppress noise-induced false triggering. The hardware duty cycle detection subunit consists of a Schmitt trigger U5 and an RC integrator circuit. Its input is connected to the system's original PWM drive signal, converting the PWM signal's duty cycle into a corresponding voltage value. This dynamically adjusts the comparator's threshold voltage; a larger duty cycle results in a lower absolute threshold value and higher trigger sensitivity. The threshold trigger module output is divided into three paths. The first path outputs a trigger enable signal to the enable terminal of the adaptive compensation generation module. The second path outputs a trigger enable signal to the enable terminal of the drive signal modulation and output module to realize the synchronous start and stop of compensation and modulation. The third path outputs a 4-bit interval selection signal to the adaptive compensation generation module to select the compensation channel of the corresponding gain.

[0037] like Figure 5As shown, the adaptive compensation generation module includes a segmented compensation amount generation subunit, an anti-slope compensation subunit, a load tracking compensation subunit, and a signal superposition subunit. The segmented compensation amount generation subunit is constructed using a four-channel analog switch U6 (CD4051) and a four-channel analog multiplier U7 (AD633). Based on the interval selection signal, it selects the multiplier channel corresponding to the gain, generating a base compensation amount linearly proportional to the di / dt amplitude. When di / dt is positive, a positive compensation amount is generated; when di / dt is negative, a negative compensation amount is generated. The anti-slope compensation subunit consists of a proportional operation circuit U8. Its input is connected to the output voltage of the hardware duty cycle detection subunit, generating a negative DC compensation amount positively correlated with the duty cycle. This negative DC compensation amount is superimposed on the base compensation amount to offset the peak current limitation caused by traditional fixed slope compensation. Under the Boost circuit conditions of 80% duty cycle and 100kHz switching frequency, the peak inductor current affected by slope compensation can be restored to over 96%. The load tracking compensation subunit consists of a sample-and-hold circuit U9 (LF398) and a proportional operation circuit U10. Its input is connected to a current sampling signal to extract the load's static current value. This value is then used to adjust the reference voltage of the multiplier U7. Under light load conditions, the compensation gain is reduced to avoid overcompensation, while under heavy load conditions, the compensation gain is increased to enhance the suppression effect. The signal superposition subunit uses an operational amplifier U11 to build an inverting adder circuit. Its three inputs are connected to the basic compensation amount, the negative DC compensation amount, and the gain calibration amount, respectively. These three signals are linearly superimposed in a 1:1:0.2 ratio, and the final drive compensation signal is output to the drive signal modulation and output module.

[0038] like Figure 6 As shown, the drive signal modulation and output module includes a modulation subunit, a drive buffer subunit, and a current buffer compensation subunit. The modulation subunit uses a high-speed PWM comparator U12 (TLV3501) to achieve duty cycle modulation. It superimposes the sawtooth wave of the original drive signal with the drive compensation signal, compares it with a reference voltage, and generates an adjusted PWM signal. The enable terminal of the modulation subunit is connected to the output terminal of the threshold trigger module, enabling modulation only when the trigger enable signal is valid; otherwise, it directly transmits the original drive signal. The drive buffer subunit uses complementary MOSFETs Qp and Qn to build a push-pull super source follower architecture, reducing the drive output impedance to below 50mΩ, significantly improving the drive capability of power switching devices with large capacitive gate loads. The current buffer compensation subunit consists of a common-gate transistor Qg and a 100pF Miller compensation capacitor Cm, connected in series in the output link of the drive buffer subunit. The capacitor value is set to 1 / 10 of the gate input capacitance of the power switching device, pushing the right-plane zero point of the drive link to more than 3 times the system bandwidth, ensuring a phase margin ≥60° across the entire load range, and avoiding loop oscillation. The final output terminal of the drive signal modulation and output module is connected to the drive electrode (gate) of the power switching device.

[0039] The auxiliary function modules in this embodiment include a reference source module, a soft-start module, an overcurrent protection module, and an overtemperature protection module. The reference source uses a TL431 to build a 2.5V high-precision reference source with a temperature drift coefficient ≤50ppm / ℃, providing reference voltage and reference current for the entire system. The soft-start module consists of a 555 timer and a capacitor charging circuit, gradually increasing the PWM duty cycle within 3ms of power-on to reduce the startup inrush current by more than 60%. The overcurrent protection module uses a high-speed comparator; when the sampled current exceeds 55A, it immediately shuts off the drive output, with priority higher than normal compensation logic. The overtemperature protection module consists of an NTC thermistor and a two-stage comparator, triggering derating protection at 125℃ and thermal shutdown protection at 150℃.

[0040] The complete working process of this embodiment is as follows: When the load suddenly increases, the current in the main power circuit experiences a transient surge. The transient current sampling module collects the current signal in real time and synchronously shunts it to the downstream module. The current change rate detection module extracts the positive di / dt signal through hardware differentiation and outputs it synchronously to the threshold trigger module and the adaptive compensation generation module. The threshold trigger module determines whether the di / dt signal exceeds the threshold based on the real-time duty cycle and immediately outputs the trigger enable signal and the interval selection signal to synchronously wake up the compensation and modulation links. The adaptive compensation generation module integrates multi-dimensional information to generate a matching positive drive compensation amount. The drive signal modulation and output module merges the original drive signal and the compensation signal within the same switching cycle to increase the PWM duty cycle, enhance the conduction capability of the power switching devices, and suppress current drops and output voltage drops. When the current fluctuation returns to stability and the di / dt signal falls back to the threshold range, the trigger enable signal is turned off, the compensation link exits, and the system returns to steady-state operation.

[0041] This embodiment is applied to a DC constant current source system for geological exploration, driving a 100m long cable inductive load. When the load undergoes a step change from 0 to 10A, the full-link response time is ≤300ns. The drive signal adjustment is completed within the same switching cycle. The output current accuracy of the constant current source is improved from ±5% in the traditional solution to within ±0.5%, and the AC component suppression rate of the loop reaches over 90%. This perfectly solves the problem of low output current and large fluctuations of the constant current source under long cable inductive loads.

[0042] Example 2 This embodiment is a power drive system including the aforementioned adaptive adjustment drive signal circuit, specifically a flyback switching power supply system, such as... Figure 7 As shown, it includes a main control unit, a flyback transformer, a primary power switch, a secondary synchronous rectifier, an output filter unit, a load, and the circuit for adaptively adjusting the drive signal of the present invention.

[0043] The primary-side PWM drive signal of the main control unit is output to the gate of the primary-side power switch, and the secondary-side synchronous rectification drive signal is used as the original drive signal of the system and input to the threshold trigger module, adaptive compensation generation module, and drive signal modulation and output module of the circuit of the present invention. The current transient sampling module of the circuit of the present invention is connected in series in the source circuit of the secondary-side synchronous rectifier to collect the secondary circuit current in real time. The output terminal of the circuit of the present invention is connected to the drive terminal of the secondary-side synchronous rectifier to adaptively adjust the drive signal of the synchronous rectifier.

[0044] In this embodiment, when the secondary load undergoes a sudden change, the circuit of the present invention can collect the changes in the secondary current in real time, extract the di / dt trend characteristics, and adjust the drive signal of the synchronous rectifier within the same switching cycle. This avoids the risk of turn-off delay of the synchronous rectifier and shoot-through between the primary and secondary sides, while suppressing output voltage fluctuations. The load regulation rate of the flyback power supply is optimized to within ±0.15%, and the cross regulation rate is optimized to within ±0.3%, which greatly improves the dynamic response performance and operational stability of the flyback power supply.

[0045] It should be noted that the above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications, or equivalent embodiments, based on the disclosed technical content without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A circuit for adaptively adjusting a drive signal, applied in a power drive system, comprising a current sampling unit connected to the main power circuit of the load, and a drive output unit that receives the original drive signal of the system and outputs a drive signal to a power switching device, characterized in that, It also includes a current change rate detection module, a threshold trigger module, and an adaptive compensation generation module that sequentially form a hardware closed-loop signal link; the current sampling unit is a current transient sampling module, whose input is connected in series to the main power circuit of the load, and its three outputs are electrically connected to the input of the current change rate detection module, the load tracking compensation subunit of the adaptive compensation generation module, and the system overcurrent protection module, respectively; the two outputs of the current change rate detection module are electrically connected to the first input of the threshold trigger module and the segmented compensation amount generation subunit of the adaptive compensation generation module, respectively; the second input of the threshold trigger module is connected to the original system drive signal, and its output is electrically connected to the enable terminal of the adaptive compensation generation module and the enable terminal of the drive output unit, respectively, and also synchronously outputs an interval selection signal corresponding to the trigger level to the adaptive compensation generation module; the third input of the adaptive compensation generation module is connected to the original system drive signal, and its output is electrically connected to the compensation signal input terminal of the drive output unit; the original signal input terminal of the drive output unit is connected to the original system drive signal, and its output is electrically connected to the drive electrode of the power switching device.

2. The circuit for adaptively adjusting the driving signal according to claim 1, characterized in that, The transient current sampling module adopts a differential sampling architecture, including a high-precision sampling resistor, a differential high-speed operational amplifier unit, and a low-pass filter subunit. The high-precision sampling resistor is connected in series in the main power circuit of the load, and its output is synchronously shunted to the three downstream associated modules after passing through the low-pass filter subunit.

3. The circuit for adaptively adjusting the driving signal according to claim 2, characterized in that, The current change rate detection module includes a hardware differentiating circuit, a phase compensation subunit, and a peak detection subunit connected in sequence. The hardware differentiating circuit performs differentiation on the current sampling signal to extract the current change rate di / dt signal. The peak detection subunit has a built-in hardware reset circuit, and the reset terminal is electrically connected to the output terminal of the threshold triggering module.

4. The circuit for adaptively adjusting the driving signal according to claim 3, characterized in that, The threshold triggering module is a multi-window segmented window comparator circuit with built-in di / dt thresholds for four load intervals. Each interval is configured with an independent positive / negative threshold and an adjustable hysteresis window. It also integrates a hardware duty cycle detection subunit, which can dynamically adjust the di / dt triggering threshold according to the real-time duty cycle of the system.

5. The circuit for adaptively adjusting the driving signal according to claim 4, characterized in that, The adaptive compensation generation module includes a segmented compensation amount generation subunit, an anti-slope compensation subunit, a load tracking compensation subunit, and a signal superposition subunit. The segmented compensation amount generation subunit generates a basic compensation amount that matches di / dt based on the interval gating signal. The anti-slope compensation subunit generates a negative DC compensation amount that matches the duty cycle. The load tracking compensation subunit generates a gain calibration amount that adapts to the entire load range. Finally, the signal superposition subunit linearly superimposes the compensation signal to output the driving compensation signal.

6. The circuit for adaptively adjusting the driving signal according to claim 5, characterized in that, The signal superposition subunit adopts an inverting adder circuit. The basic compensation amount, negative DC compensation amount, and gain calibration amount are linearly superimposed in a ratio of 1:1:0.

2. The polarity of the basic compensation amount is consistent with the polarity of the di / dt signal, the negative DC compensation amount is a fixed negative polarity, and the gain calibration amount is a positive polarity signal that is positively correlated with the static load current.

7. The circuit for adaptively adjusting the driving signal according to claim 1, characterized in that, The drive output unit is a drive signal modulation and output module, including a modulation subunit, a drive buffer subunit, and a current buffer compensation subunit. The modulation modes of the modulation subunit include: duty cycle modulation mode, which uses a high-speed PWM comparator to superimpose the compensation signal onto the sawtooth wave reference of the original drive signal to adjust the conduction duty cycle; amplitude modulation mode, which uses a controllable voltage regulator and an analog switch to adjust the high-level amplitude of the drive signal through the compensation signal; and edge slope modulation mode, which uses a controllable current source and a gate resistor array to adjust the rising / falling edge slope of the drive signal through the compensation signal.

8. The circuit for adaptively adjusting the driving signal according to claim 1, characterized in that, It also includes auxiliary function modules, which include a reference source module, a soft start module, an overcurrent protection module, and an overtemperature protection module.

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