CN-121978437-A - Energy-saving DC power supply load

CN121978437ACN 121978437 ACN121978437 ACN 121978437ACN-121978437-A

Abstract

The invention discloses an energy-saving direct-current power supply load, in particular to the technical field of semiconductor testing, which is used for solving the problems of test waveform distortion and hysteresis caused by mutual interference between an energy recovery system and load current control in the dynamic test of the existing direct-current electronic load; the method comprises the steps of monitoring direct current bus voltage ripple and load current tracking errors through a circuit monitoring module, constructing a dynamic working point track in a phase plane by a track constructing module, calculating divergence of the dynamic working point track relative to a stable operation area, identifying local geometric features of the track when the divergence exceeds a stability threshold value by a feature identifying module, mapping the geometric features into state categories by a weight evaluating module, evaluating cooperative weights, analyzing an interaction mode of an energy recovery power adjustment rate and a load current change rate by an interaction analyzing module according to the cooperative weights, and executing cooperative operation of load current control and energy recovery power scheduling by a cooperative executing module to achieve improvement of dynamic test accuracy and optimization of energy recovery efficiency.

Inventors

XIONG JUNFENG
LIANG YUANWEN

Assignees

深圳市鼎泰佳创科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260126

Claims (10)

1. An energy efficient dc power load comprising: the circuit monitoring module is used for monitoring the voltage ripple of the direct current bus and the tracking error of the load current of the energy recovery circuit; The track construction module is used for constructing a dynamic working point track in a phase plane formed by the energy recovery power and the load current change rate according to the DC bus voltage ripple and the load current tracking error, and calculating the divergence of the dynamic working point track relative to a stable running area; The characteristic identification module is used for identifying local geometric characteristics of the dynamic working point track when the divergence exceeds a stability threshold value; the weight evaluation module is used for mapping the local geometric characteristics into state categories representing the dynamic quality of the system and evaluating the cooperative weight of the energy recovery efficiency and the load tracking precision under the current working condition based on the state categories; The interaction analysis module is used for analyzing an interaction mode of the energy recovery power regulation rate and the load current change rate according to the cooperative weight; And the cooperative execution module is used for executing cooperative operation of load current control and energy recovery power scheduling based on the interaction mode.
2. The energy efficient dc power supply load of claim 1, wherein monitoring dc bus voltage ripple and load current tracking error of the energy recovery circuit comprises: continuously sampling the voltage of the direct current bus through a voltage sensor, and adopting digital filtering processing to separate out voltage ripples of the direct current bus; Meanwhile, the actual current value of the load loop is obtained through the current sensor, and the actual current value is compared with the reference current value in the dynamic test waveform in real time, so that the load current tracking error is calculated.
3. An energy efficient dc power supply load according to claim 1, wherein constructing a dynamic operating point locus in a phase plane formed by the energy recovery power and the load current change rate based on the dc bus voltage ripple and the load current tracking error, and calculating the divergence of the dynamic operating point locus with respect to the steady operation region, comprises: Calculating real-time energy recovery power based on the DC bus voltage ripple amplitude and the working state of the energy recovery circuit; performing time domain differentiation processing on the load current tracking error to obtain a load current change rate; Forming a two-dimensional coordinate point by the real-time energy recovery power and the load current change rate, and forming a dynamic working point track by connecting continuously acquired coordinate points in a phase plane according to time sequence; an elliptic stable operation area formed by gathering working points under historical normal operation conditions is established in a phase plane; The divergence is quantified by calculating the standard deviation of the minimum distance sequence of each sampling point of the dynamic operating point track relative to the boundary of the elliptical steady-state operating region, wherein an increase in the standard deviation of the minimum distance sequence indicates the evolution of the dynamic operating point track to an unstable state.
4. An energy efficient dc power supply load according to claim 3, wherein performing time domain differentiation on the load current tracking error to obtain a load current change rate comprises performing numerical differentiation on a continuously sampled load current tracking error sequence by a backward differentiation method, subtracting load current tracking error values of two adjacent sampling periods, dividing the subtracted load current tracking error values by a sampling time interval to obtain a discrete sequence of the load current change rate, and performing smoothing on the discrete sequence of the load current change rate by a first order low pass digital filter to suppress measurement noise interference.
5. The energy-saving direct-current power supply load according to claim 3, wherein the step of establishing an elliptic stable operation area formed by gathering working points under the historical normal operation condition in a phase plane comprises the steps of collecting an energy recovery power and load current change rate coordinate point set in the phase plane in the historical normal operation stage, calculating a mean value and a covariance matrix of the coordinate point set in two coordinate axis directions, and establishing an elliptic area boundary containing a preset percentage of normal working points by taking the mean value as a center and taking a covariance matrix eigenvector as an axial direction.
6. An energy efficient dc power supply load according to claim 1 wherein identifying local geometric features of the dynamic operating point trajectory when divergence exceeds a stability threshold comprises: when the divergence exceeds a stability threshold, intercepting track fragments formed by the latest continuous sampling points of the dynamic working point track in a phase plane; calculating a steering angle change sequence of a connecting line of adjacent sampling points in the track segment; And classifying the track segments into one geometrical characteristic of a spiral convergence form, a linear divergence form or a stable sliding form according to the statistical characteristics of the steering angle change sequence.
7. The energy-efficient direct current power supply load according to claim 6, wherein classifying the track segments into one of a spiral converging configuration, a straight diverging configuration, and a steady sliding configuration according to the statistical characteristics of the steering angle change sequence comprises calculating a standard deviation and a mean value of the track segment steering angle change sequence, determining the spiral converging configuration when the standard deviation is greater than an angle threshold and the mean value is close to zero, determining the straight diverging configuration when the standard deviation is less than the angle threshold and the mean value is positive, determining the steady sliding configuration when the standard deviation is less than the angle threshold and the mean value is close to zero, wherein the absolute value of the mean value is less than 5 degrees, and the mean value is positive and the mean value is greater than 5 degrees.
8. The energy efficient dc power supply load according to claim 1, wherein mapping the local geometric features into a state class characterizing the dynamic quality of the system, and evaluating the cooperative weight of the energy recovery efficiency and the load tracking accuracy under the current working condition based on the state class, comprises: when the local geometric characteristic is in a spiral convergence form, determining a state type as a stable oscillation state, and distributing higher weight for energy recovery efficiency; when the local geometric features are in a straight-line divergent form, determining the state type as a quick unstability state, and distributing higher weight for load tracking precision; The state class is determined to be the high-efficiency cruise state when the local geometry is a smooth coasting configuration, and the highest weight is assigned to the energy recovery efficiency.
9. An energy efficient dc power supply load according to claim 1 wherein analyzing the interaction pattern of the energy recovery power regulation rate and the load current change rate according to the cooperative weights comprises: limiting the load current rate of change and allowing the energy recovery power adjustment rate to respond preferentially when the cooperative weights are ramped toward the energy recovery efficiency; Limiting the rate of energy recovery power adjustment and allowing the rate of load current change to respond preferentially when the cooperative weights are tilted toward load tracking accuracy; when the cooperative weight is in the balance area, a proportional following relation between the energy recovery power regulation rate and the load current change rate is established.
10. An energy efficient dc power supply load according to claim 1, characterized in that the co-operation of load current control and energy recovery power scheduling is performed based on an interaction pattern, comprising: outputting a smoothing command to the load current controller and releasing a response limit to the energy recovery power regulator when the interaction mode is to limit the load current change rate; Outputting a ramp command to the energy recovery power regulator and releasing the response limit to the load current controller when the interaction mode is to limit the energy recovery power regulation rate; When the interaction mode is in a proportion following relation, the load current change instruction and the energy recovery power adjustment instruction are synchronously sent, and the change rate proportion of the load current change instruction and the energy recovery power adjustment instruction is kept consistent.

Description

Energy-saving DC power supply load Technical Field The invention relates to the technical field of semiconductor testing, in particular to an energy-saving direct-current power supply load. Background In the production verification of a new energy automobile electric control system core component, such as a motor controller and a vehicle-mounted charger, long-term aging test of a high-power semiconductor device is a necessary means for ensuring the reliability of a vehicle-mounted level of the high-power semiconductor device, and a direct-current electronic load is generally adopted as an energy consumption device. In order to cope with complex power change working conditions in the running process of the vehicle, the aging test needs to simulate a dynamic load curve comprising acceleration and braking energy recovery, and meanwhile, in order to reduce the test energy consumption, an energy recovery technology is introduced into the load in the industry to convert and reuse test electric energy. In the prior art, the electronic load integrating the energy recovery function can give consideration to both energy efficiency and basic functions in steady state test. However, when the load device executes the test waveform with high dynamic change to simulate the real working condition of the vehicle, the power dispatching process of the energy recovery system can generate coupling interference with the rapid tracking control of the load current, the interaction effect of the system layer leads to the distortion and hysteresis of the actual response waveform of the load, the accuracy of dynamic test is destroyed, the performance evaluation result of the vehicle-standard semiconductor component under the simulated working condition is not aligned, the abnormal working state caused by the dynamic test result also forms potential risks for the durability of the test system and the tested device, and finally the reliable application of the high-efficiency test equipment in the aging test of the key component of the new energy automobile is restricted. Disclosure of Invention The invention provides an energy-saving direct-current power supply load aiming at the technical problems in the prior art. The technical scheme for solving the technical problems is as follows: An energy efficient dc power load comprising: the circuit monitoring module is used for monitoring the voltage ripple of the direct current bus and the tracking error of the load current of the energy recovery circuit; The track construction module is used for constructing a dynamic working point track in a phase plane formed by the energy recovery power and the load current change rate according to the DC bus voltage ripple and the load current tracking error, and calculating the divergence of the dynamic working point track relative to a stable running area; The characteristic identification module is used for identifying local geometric characteristics of the dynamic working point track when the divergence exceeds a stability threshold value; the weight evaluation module is used for mapping the local geometric characteristics into state categories representing the dynamic quality of the system and evaluating the cooperative weight of the energy recovery efficiency and the load tracking precision under the current working condition based on the state categories; The interaction analysis module is used for analyzing an interaction mode of the energy recovery power regulation rate and the load current change rate according to the cooperative weight; And the cooperative execution module is used for executing cooperative operation of load current control and energy recovery power scheduling based on the interaction mode. Further, monitoring the dc bus voltage ripple and load current tracking error of the energy recovery circuit includes: continuously sampling the voltage of the direct current bus through a voltage sensor, and adopting digital filtering processing to separate out voltage ripples of the direct current bus; Meanwhile, the actual current value of the load loop is obtained through the current sensor, and the actual current value is compared with the reference current value in the dynamic test waveform in real time, so that the load current tracking error is calculated. Further, according to the dc bus voltage ripple and the load current tracking error, a dynamic working point track is constructed in a phase plane formed by the energy recovery power and the load current change rate, and the divergence of the dynamic working point track relative to the stable operation area is calculated, including: Calculating real-time energy recovery power based on the DC bus voltage ripple amplitude and the working state of the energy recovery circuit; performing time domain differentiation processing on the load current tracking error to obtain a load current change rate; Forming a two-dimensional coordinate point by the real-time energy recovery power and t