An Improved Digital Algorithm for Boost PFC Converter Operating in Mixed Conduction Mode
Citations
29 citations
Cites background from "An Improved Digital Algorithm for B..."
...As one of the most popular PFC converters [5]–[9], the boost converter exhibits many advantages, such as small line current ripple due to series connection of inductor at the input side....
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19 citations
Cites background from "An Improved Digital Algorithm for B..."
...However, PI controllers are designed and tuned based on the small signal transfer function Gid(s) [13], [33], [34]....
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...PI/PID current controllers are designed as per the small signal control to current transfer function Gid(s) of the converter [13], [33], [34]....
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...High input power factor, low THD current is desired in PFC converters to conform to harmonic norms [1], [18], [33]....
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16 citations
5 citations
Additional excerpts
...vo[n + 2] = vo[n] + 2Tv × {αv ⋅ Iref L [n] + Fv[n]}, (18)...
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...By discretizing Equation (17), the predicted output voltage value of next two step vo[n+ 2] is obtained as vo[n + 2] = vo[n] + 2Tv × {𝛼v ⋅ IrefL [n] + Fv[n]}, (18) where vo[n] is the output voltage in the current state, Tv represents the sampling period of the voltage controller....
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5 citations
References
652 citations
"An Improved Digital Algorithm for B..." refers background in this paper
...The single-phase boost PFC converter is the most popular among PFC topologies due to its topological advantages such as continuous input current, stepped up voltage, and simple gate drive [1]–[3]....
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634 citations
"An Improved Digital Algorithm for B..." refers background or methods in this paper
...The advantages and popularity of digital control have led to increased interest in predictive current control algorithms for PFC and dc–dc converters [16]....
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...Predictive constant frequency peak current control [16], [17], valley current control [16], predictive average current control [16], [19], and variable...
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...4) Predictive CCM Average Current Controller: Predictive average current controllers for CCM are widely researched [16]....
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...Predictive CCM average current controllers for the three topologies, buck, boost, and buck–boost, are presented in [16]....
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...It is reported that triangular modulation avoids instability in CCM [16]....
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168 citations
"An Improved Digital Algorithm for B..." refers background in this paper
...In DCM operation, there exist oscillations in the inductor current during the switch and diode off duration due to the resonance between boost inductance and parasitic capacitances of the semiconductor devices [21], [24]....
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...Therefore, an RC snubber [24] with values Rsnub = 1....
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...If these oscillations do not die down before the next turn-on instant of the switch, the inductor current may rise from a nonzero current, leading to poor tracking of average current [24]....
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...The presence of negative resonance current during DCM operation even with a RC snubber affects the average current tracking [24], [25] and leads to high-input-current total harmonic distortion (THD)....
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...The first option being the use of the analytical expression for iL(t) during oscillations [24] to evaluate the transcendental equations for ioffset(t) and tosc in real time....
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146 citations
"An Improved Digital Algorithm for B..." refers background or methods in this paper
...In DCM operation, there exist oscillations in the inductor current during the switch and diode off duration due to the resonance between boost inductance and parasitic capacitances of the semiconductor devices [21], [24]....
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...2) Proposed Digital Compensation Technique: In the practical boost converter, the parasitic capacitances of the switch and the diode resonate with the boost inductance to cause oscillations during diode turn-off [21], [24]....
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...An external auxiliary DCM detection circuit along with adaptive switching and adaptive frequency control proposed for an MCM boost PFC converter in [21] using predictive CCM and DCM current controllers, however, requires additionally a PI action and a time interval measurement for the predictive equations using a counter and auxiliary circuit....
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123 citations
"An Improved Digital Algorithm for B..." refers background or methods in this paper
...Average inductor current control is preferred in power converters owing to its noise immunity, ease of digital implementation, and its suitability for current shaping in PFC applications [13], [14]....
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...frequency predictive control [20] are popular for dc–dc converters; however, predictive average current controllers are the most suitable for PFC applications [13], [14]....
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...In [6], [10], and [14], average current controllers are designed using linear compensators for MCM operation....
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...The integrated high-speed hardware comparator in a DSP is used for mode detection in [10], while an inductor current sample correction along with dual PI controllers is used for MCM operation of the boost PFC converter in [14]....
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...A current controller designed for CCM performs poorly in DCM and vice versa due to the different dynamics of the converter in each of the modes [7], [14] and the fact that the sampled current is not the average current in DCM [12], [14]....
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