ISOLATED DC-DC POWER CONVERTER WITH LOW RADIATED EMISSIONS

摘要

An example DC-DC power converter circuit includes an H-bridge switching circuit (103) operatively coupled with a transformer (T1). The switching circuit (103) is compensated to account for parasitic differences between the high-side (power) and low-side (ground). For instance, PMOS transistors (Q1 and Q2) connected to the high-side are sized larger to substantially match on-resistance of NMOS transistors (Q3 and Q4) connected to the low-side (e.g., such that the on-resistances are all within a tolerance of one another), and the NMOS transistors (Q3 and Q4) include additional gate-drain capacitance (C1 and C2) to substantially match gate-drain capacitance of the larger PMOS transistors (e.g., such that the gate-drain capacitances are all within a tolerance of one another, or within a tolerance of a target gate-drain capacitance value). In addition, the transformer (T1) is configured with physical symmetry, such that the inductive and capacitive mid-points of the transformer are substantially co-located.p