High-efficiency dc/dc voltage converter including down inductive switching pre-regulator and capacitive switching post-converter
A technology of voltage converters and regulators, applied in the direction of regulating electrical variables, control/regulating systems, output power conversion devices, etc., can solve the problems of not being a voltage regulator, affecting transient regulation, stability and noise, etc.
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[0219] Figure 13 Graphically illustrates the required voltage conversion ratio V of a DC / DC converter operating at multiple output voltages for various input voltages ranging from 1.8V to 6.6V out / V in . For example, curve 361 illustrates that for an input range of 4.5V to 5.5V, regulating a 5V output to ±1% accuracy requires operation above or below the unity conversion ratio, which means that a buck-boost regulation is required The converter maintains tighter tolerances than the typically guaranteed ±5% or ±10% accuracy of low cost AC / DC wall adapters.
[0220] Another need for a boost-buck converter arises when a LiIon battery is used to generate voltages in the middle of its wide voltage range. For example, Figure 13 Curves 362, 363, and 364 in , illustrate outputs of 4V, 3.6V, and 3.3V, respectively. Since these load voltages fall within the normal discharge voltage range of 4.2V to 3V for LiIon batteries, the converter must regulate in buck mode with a voltage co...
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