Dynamic effects of inductor current ripple in peak-current and average-current mode control

Suntio, Teuvo; Rahkala, M.; Gadoura, I.; Zenger, Kai

doi:10.1109/iecon.2001.975929

Cited by 22 publications

(22 citation statements)

References 16 publications

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“…The distinct difference between (4) and (10), (16) is that the approximate poles, zeros, resonant frequencies and quality factors given by (7)-(8), (11)-(14) and (17)-(19) are related explicitly with the converter circuit and operating parameters. This makes it easy to visualize and analyze how parameter changes affect the locations of the poles and zeros of (4), thus the small-signal dynamics.…”

Section: Introductionmentioning

confidence: 99%

“…In [4], inductor ripple current is considered in the model derivation, leading to an additional term in the gain expression. The derivation assumes an ideal current amplifier and absence of the high-frequency, ripple-reduction capacitor in the current loop compensator.…”

Section: Introductionmentioning

confidence: 99%

“…The control-to-output voltage transfer function is given by [3] (4) where G dv (s) is the duty-cycle-to-output capacitor voltage transfer function.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of circuit and operating parameters on the small-signal dynamics of average-current-mode-controlled DC-DC converters

OaBrien

Lee

et al. 2011

8th International Conference on Power Electronics - ECCE Asia

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This paper presents a detailed and quantitative analysis of parameter effects on the smallsignal dynamics of DC-DC converters with average current mode control. The parameters under study include the converter circuit and its operating parameters. Their effects on the converter frequency response are analyzed and clearly characterized in low, mid, and high frequency ranges of the control-to-output voltage transfer function of the control scheme. In addition, new insights into average current mode control are uncovered and discussed. Measurable results on an experimental averaged-currentmode-controlled Buck converter are provided to facilitate the analytical study with good correlation.Index Terms -Average current mode control, DC-DC converters, parameter effects, small-signal average models.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of circuit and operating parameters on the small-signal dynamics of average-current-mode-controlled DC-DC converters

OaBrien

Lee

et al. 2011

8th International Conference on Power Electronics - ECCE Asia

View full text Add to dashboard Cite

show abstract

“…For this reason, many technical papers dealing with the modeling and design of average current mode control have been reported [2]- [4]. The small signal model considering the sampling effect in a current control loop has been known as an accurate one particularly in peak current mode control [5], [6].…”

Section: Introductionmentioning

confidence: 99%

“…Average current mode control was developed in the early 90's [1] and has been widely used in many converter applications where a low harmonic content of the converter input current is necessary [2]- [4]. Average current mode control has several advantages when compared with peak current mode control such as its not needing an external stabilizing ramp signal, the high current loop gain in the low frequency region, and an improved noise immunity.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Sampling Effect in the P-Type Average Current Mode Control

Jung

Kim²

2011

Journal of Power Electronics

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This paper presents the modeling of the sampling effect in the p-type average current mode control. The prediction of the high frequency components near half of the switching frequency in the current loop gain is given for the p-type average current mode control. By the proposed model, the prediction accuracy is improved when compared to that of conventional models. The proposed method is applied to a buck converter, and then the measurement results are analyzed.

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Average and Small‐Signal Modeling of Average‐Current‐Mode Control

2009

Dynamic Profile of Switched‐Mode Converter

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Average-current-mode (ACM) control was introduced in the early 1990s [1] to alleviate the disadvantages related to the peak-current-mode (PCM) control such as the limited-duty-ratio range and high-frequency noise sensitivity [2,3]. ACM control is typically used in power-factor-correction applications [4] and in the converters interfacing the solar panels [5,6]. The duty-ratio generation is basically identical to the method utilized in the VMC control, but the control signal contains both the output-voltage-loop control signal and the averaged inductor current. The internal dynamics of the converter would naturally change by application of ACM control but may resemble either the dynamics of VM or PCM control depending on the level of inductor-current ripple left in the duty-ratio generation. It may be obvious that the dynamical modeling is quite similar to the PCM modeling introduced in Chapter 4. Therefore, it is also natural that the proposed modeling methods in [7, 8, 11, 13, and, 14] would utilize the modeling of PCM control [9,12,15]. We will introduce the ACM modeling only in the continuous conduction mode. The DCM models can be naturally derived by applying the proposed method and using the results developed for the PCM control in DCM (Chapter 4, Section 4.4). ACM-Control PrincipleUnder ACM control, the duty ratio (d) is generated comparing the output signal (u ca ) of the current-loop amplifier and the constant ramp signal (R s M c ) provided by the PWM modulator as shown in Figure 5.1, where R s is the inductor-current equivalent sensing resistor, and M c the slope of the PWM ramp in current domain. The duty ratio is established when the output signal (u ca ) of the current-loop amplifier reaches the PWM ramp signal. The output signal of the current-loop amplifier (u ca ) can be given by u ca = u co + G ca (u co − R s i L ) ( 5.1)Dynamic Profile of Switched-Mode Converter. Teuvo Suntio 

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Dynamic effects of inductor current ripple in peak-current and average-current mode control

Cited by 22 publications

References 16 publications

Effects of circuit and operating parameters on the small-signal dynamics of average-current-mode-controlled DC-DC converters

Effects of circuit and operating parameters on the small-signal dynamics of average-current-mode-controlled DC-DC converters

Modeling of the Sampling Effect in the P-Type Average Current Mode Control

Average and Small‐Signal Modeling of Average‐Current‐Mode Control

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