A Charging and Discharging Characteristic Curve Fitting Algorithm in RC Charging and Discharging Loop

Abstract

The invention provides a charge-discharge characteristic curve fitting algorithm under an RC charge-discharge circuit, which includes the following steps: assuming a charge characteristic curve 2 anda discharge characteristic curve 2 according to an actual charge characteristic curve 1 and an actual discharge characteristic curve 1, fitting the actual charge characteristic curve 1 and the chargecharacteristic curve 2 and fitting the actual discharge characteristic curve 1 and the discharge characteristic curve 2 respectively to get charge and discharge characteristic curve feature value groups under a long step method; carrying out fitting through a small step method to get charge and discharge curve feature values under the small step method; and determining the actual charge characteristic curve 1 and the actual discharge characteristic curve 1. The application scope of the RC charge-discharge circuit curve fitting technology is expanded. High speed and high accuracy are achieved for charge-discharge characteristic curve fitting.

Description

technical field [0001] The invention relates to a research on a charging and discharging circuit, in particular to a charging and discharging characteristic curve fitting algorithm in an RC charging and discharging circuit. Background technique [0002] The root of analyzing the RC charging and discharging circuit is to find its corresponding physical characteristics, and the most important step is to find out its corresponding charging and discharging equation. Through curve fitting, the physical coefficients corresponding to the RC charging and discharging characteristic curves can be found to help the analysis. The existing high-efficiency and high-speed fitting technology for charging and discharging characteristic curves is realized on the PC side, especially the fitting technology based on MATLAB, which is based on the powerful hardware processing capability of the PC. However, the hardware processing capability of the embedded platform cannot reach that level, which ...

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Problems solved by technology

[0003] Secondly, at present, when electric vehicles use the pre-estimation method to solve the insulation resistance value, due to the existence of RC circuits, the AD samples collected by the chip are inaccurate.

Due to the existence of the RC circuit, the voltage at both ends of the circuit components is out of alignment, and the voltage delay is stable, so the calculation results are often wrong, and cause a huge workload

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