Adjacent Cell-to-Cell equalization circuit and control method based on three-resonance state lc conversion
A technology of equalization circuit and series resonant circuit, which is applied in the direction of charge equalization circuit, circuit device, battery circuit device, etc., can solve problems such as difference, battery voltage or SOC extremely unbalanced, and low equalization efficiency, so as to achieve wide practicability and reduce Small size, the effect of improving the equalization efficiency
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[0060] As shown in Figure 1, the microcontroller of the equalization circuit uses a digital signal processing chip DSP (TMS320F28335), which has high-precision AD sampling and PWM output; The voltage of the battery; the battery module is a lithium iron phosphate power battery with a capacity of 6.2Ah. As shown in Figure 1(a), it is the overall model diagram of the three-resonance state LC conversion module applied to the battery pack. Every two adjacent battery cells share a three-resonance state LC conversion module. For an N-cell battery cell The battery packs connected in series share (N-1) three-resonance state LC conversion modules.
[0061] As shown in Figure 1(b), the three-resonance state LC conversion module is applied to two adjacent battery cells B 0 and B 1 . The three-resonance state LC conversion module consists of four MOS tubes Q 0 -Q 3 Series branch, LC series resonant circuit and a MOS tube branch Q 4 composition. Among them, MOS tube Q 0 The drain of...
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