Constant-amplitude impulse current charging method combining positive and negative pulses
A technology of pulse current and charging method, which is applied in the field of electric power system, can solve the problems such as unable to maintain fast charging with large current, and achieve the effect of improving charging speed and efficiency
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[0015] Concrete steps of the present invention are:
[0016] a. DC power supply: DC power supply is generally a photovoltaic cell obtained after rectification and filtering of AC power supply or after MPPT;
[0017] b. Monitoring of battery SOC: Use the density method, open circuit voltage method, and internal resistance method to monitor the battery SOC online at the beginning of charging and during charging;
[0018] c. The control of frequency modulation pulse and charging current in the first stage: the battery SOC is monitored to be state 1, and the frequency conversion pulse is period T 1 , the duty cycle d 1 =0.83 pulse;
[0019] d. Negative pulse control in the first stage: the negative pulse in the first stage is the pulse generated by the current generated by the reverse discharge of the capacitor through the IGBT; the pulse period is T 1 , the duty cycle d 1 ’ = (1- d 1 ) / 2, the initial angle is α 1 =-360×3 (1- d 1 ) / 4;
[0020] e. Control of frequenc...
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