Patent ID: 11971457
Assignee: TONGJI UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 1:
2. The method for measuring AC impedance of a battery in a composite power supply power system according to claim 1, wherein in said step S1, a size of the magnitude of the AC disturbance signal is determined according to an amplitude of a disturbance signal of the fuel cell and an amplitude of a disturbance signal of the lithium battery, the step S1 comprising the steps of:
S11: determining an amplitude range [λ1, λ2] of the disturbance signal of the fuel cell based on an accuracy demand of the impedance measurement and a DC output signal of the fuel cell;
S12: determining an amplitude range [λ3, λ4] of the disturbance signal of the lithium battery based on the accuracy demand of the impedance measurement and a DC output signal of the lithium battery;
S13: If there is no intersection between the amplitude range [λ1, λ2] and the amplitude range [λ3, λ4], the DC/DC voltage converter works to adjust the DC output signals of the fuel cell and the DC output signal of the lithium battery, and repeat step S11, otherwise, a value is selected from the intersection of the amplitude range [λ1, λ2] and the amplitude range [λ3, λ4] as the amplitude of the AC disturbance signal.