An Adaptive Slope Compensation Circuit for Peak Current Mode of Boost Switching Power Supply ()
ABSTRACT
Based on the analysis of the basic principle of slope compensation, a
high-precision
adaptive slope compensation circuit for peak current mode boost DC/DC converter
is designed. The circuit dynamically detects the input and output voltage of
the boost circuit to realize automatic adjustment of the compensation amount
with the change of duty ratio, which makes the ramp compensation slope
optimized. The design uses a high-precision subtracter to improve the accuracy
of slope compensation. While eliminating sub-slope oscillation and improving
the stability of boost circuit, the negative impact of compensation on boost
circuit is minimized, and the load capacity and transient response speed of
boost circuit are guaranteed. The circuit is designed based on SMIC 0.18um CMOS
technology, with simple structure, high reliability
and easy engineering implementation. Spectre circuit simulator 17.1.0.124 64b
simulation results show that the circuit has high compensation accuracy and wide
input and output voltage range. When the working voltage is 3.3 V, the compensation slope
can be adjusted adaptively under different duty cycles, and the minimum error
between the compensation slope and the theoretical optimal compensation slope
is only 0.42%.
Share and Cite:
Lin, F. and Cao, X. (2023) An Adaptive Slope Compensation Circuit for Peak Current Mode of Boost Switching Power Supply.
Open Journal of Applied Sciences,
13, 1730-1741. doi:
10.4236/ojapps.2023.1310137.
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