Non-isolation bidirectional high-gain DC/DC converter and frequency conversion control method
A frequency conversion control, non-isolation technology, applied in control/regulation systems, high-efficiency power electronic conversion, DC power input conversion to DC power output, etc., can solve problems such as inability to realize soft switching, limited voltage conversion ratio, etc., to reduce circulating current Low loss, reduced current ripple, and high power density
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[0036] This embodiment discloses a low-voltage 24V battery (V L =20~30V DC), boost to V H =270V DC, rated power P max = 500W bidirectional non-isolated DC / DC converter, set the minimum switching frequency f s,min 100kHz. It can be used in microgrid energy storage system or mild hybrid vehicle motor start-stop or regenerative braking system.
[0037] A non-isolated bidirectional high-gain DC / DC converter disclosed in this embodiment includes two parts, a main circuit and a control circuit.
[0038] The main circuit needs to determine the cascade number n first. In order to make the low voltage side V L and the high voltage side V H The voltage range satisfies the formula V H / 4V L H / 2V L , that is, select n as level 4. Then it can be determined that the main circuit is controlled by the low voltage terminal V L , high voltage terminal V H , two inductors (L 1 , L 2 ), 6 MOS tubes (S 1 ,S 2 ,Q 1 ~Q 4 ) and 4 capacitors (C 1 ~C 4 )composition. Such as figu...
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