Equalization circuit based on bipolar T-type double-resonance switched capacitor converter and control method
A technology of switching capacitors and balancing circuits, applied in charge balancing circuits, battery circuit devices, current collectors, etc., can solve problems such as slow balancing speed, reduce switching loss, increase switching frequency, and reduce circuit volume.
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Embodiment 1
[0046]figure 1 It is an equalizing circuit based on a bipolar T-type dual resonant switched capacitor converter suitable for 2*N batteries, including two series battery packs, a switch network, a balanced bus, a bipolar T-type dual resonant switched capacitor converter, Switch drive circuit, voltage sampling circuit and controller. Among them, the voltage sampling circuit collects the voltage signal of each battery cell and transmits it to the controller. The controller outputs the switch signal, which is amplified by the switch drive circuit to control the on and off of the switch network.
[0047]Two series battery packs share a bipolar T-type dual resonant switched capacitor converter for equalization. The series battery group A is connected to the equalizing bus a through the switch network A1And a2Connect to the bipolar T-type dual resonant switched capacitor converter; the series battery pack B is connected to the balanced bus b through the switch network B1And b2Connect to the b...
Embodiment 2
[0059]figure 2 It is an equalizing circuit based on bipolar T-type dual resonant switched capacitor converter suitable for 2*2 batteries. Switch SA1, SA2, SA5, SA6And SB1, SB2, SB5, SB6Consists of an N-channel MOSFET. SA1(SB1) And SA5(SB5) The D pole of the battery A1(B1) Of the positive pole and A2(B2) Is connected to the negative pole, SA1(SB1) And SA5(SB5) S pole and balanced bus a1(b1) Connection; SA2(SB2) And SA6(SB6) The D pole of the battery A1(B1) Of the positive pole and A2(B2) Is connected to the negative pole, SA2(SB2) And SA6(SB6) S pole and balanced bus a2(b2)connection. Switch SA3(SB3) And SA4(SB4) Consists of two N-channel MOSFETs connected in series with S poles, and both ends are connected to battery A1(B1)'S negative pole, balanced bus a1(b1) And battery A1(B1)'S negative pole, balanced bus a2(b2) Connected.
[0060]The bipolar T-type dual resonant switched capacitor converter consists of two inductors L1, L2It is composed of a capacitor C. Among them, one end of the ...
Embodiment 3
[0071]Assuming that in the equalization circuit of the second embodiment, the battery voltage is VA1>VB1>VB2>VA2, After the voltage sampling circuit collects the voltage information of each battery cell, it is sent to the controller, and the controller judges Amax -Amin The value of is the largest, then enters the balance mode two, the energy is from battery A1Pass to battery A2.
[0072]Figure 5 Is the direction of current flow in the equalization process,Figure 6 It is the corresponding theoretical waveform.
[0073]The positive charge state of the capacitor, such asFigure 5 As shown in (a), the duration is t0'To t1'. At t0'Moment, switch SA1And SA4Conduction. Battery A1After the inductor L1Charge the positive polarity of the capacitor C, the positive polarity of the capacitor voltage VC' rises, and the inductor current iL1'The positive polarity rises and then drops to 0. At t1'Moment, switch SA1And SA4Zero current shutdown.
[0074]The positive discharge state of the capacitor, such asFig...
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