Ripple cancellation-based inductance DC-DC converter output ripple elimination technology
A technology of output ripple and DC-DC, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems of many limitations and increased structural complexity
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[0018] (1) In the DC-DC converter circuit, a copy of the power stage part of the switching power supply is introduced to form an auxiliary power stage. The load of the auxiliary power stage is a light load as a dummy load, and the inductance value should be equal to that of the main power stage.
[0019] (2) The control signal of the switch of the auxiliary power stage is reversely obtained through the control signal of the main power stage. At this time, the ripple generated by this part will be opposite to that of the ripple in the main circuit.
[0020] (3) Through capacitive coupling, the ripple of the auxiliary power stage is coupled to the load of the main circuit, so as to eliminate the output ripple.
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