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Suppressing Electromagnetic Interference in Switching Converters by Chaotic Duty Modulation

Yuhong Song

Series: Informatik/ Kommunikation

Volume 850 2017

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Realizing Chaotic Duty Modulation S. 44-56

„… 5 Realizing Chaotic Duty Modulation 5.1 Introduction Spread spectrum modulation is categorized as …” „… chaotic duty modulation keeps at a fixed frequency, which facilitates the action of the power components …” „… chaotic duty modulation in the half-bridge topology that is widely used in low-medium power output. The …”

System Stability under Chaotic Duty Modulation S. 57-71

„… 6 System Stability under Chaotic Duty Modulation 6.1 Introduction The switching converter is a …” „… shoot-through. 57 6 System Stability under Chaotic Duty Modulation L S1 D10.5Vi RLC 0.5Vi S2 D2 D3 D4 PWM1 PWM2 …” „… Chaotic Duty Modulation linearly (The rising slope is 0.5ViLP+LKP ). The potential of the terminal “A” is …”

Circuitry Design for Chaotic Modulation S. 14-22

„… suppressed by chaotic frequency modulation and chaotic duty modulation, followed by proposals how to …” „… the implementation circuits for chaotic frequency modulation and chaotic duty modulation, respectively …” „… > γ0 k0 , 0, vch≤γ0k0 , (2.8) 16 2.3 Chaotic Duty Modulation where the cycle τ of the PWM pulse is …”

Titelei/Inhaltsverzeichnis S. I-VIII

„… Reihe 10 Suppressing Electromagnetic Interference in Switching Converters by Chaotic Duty Modulation …” „… Suppressing Electromagnetic Interference in Switching Converters by Chaotic Duty Modulation DISSERTATION zur …” „… Electromagnetic Interference in Switching Converters by Chaotic Duty Modulation Yuhong Song, M. Sc., Yichang …”

Conclusions S. 88-89

„… designing circuitry parameters. Hence, this research aims at the chaotic duty modulation and probes into its …” „… . Chaotic duty modulation is just to change the duty of the transistor driving-pulse while maintains the …” „… under chaotic duty modulation when the central frequency of chaotic signal is close to a half of the …”

Introduction S. 1-13

„… . Having this consideration in mind, we focus on chaotic duty modulation instead of chaotic frequency …” „… modulation. Chaotic duty modulation possesses the fixed frequency, which can not only overcome the …” „… control theory for analysing the system stability under chaotic duty modulation and deduce two …”

The Remaining Useful Life under Chaotic Modulation S. 72-82

„… switching frequency is regarded as their important parameter. For chaotic duty modulation, the 77 7 The …” „… Remaining Useful Life under Chaotic Modulation duty of the transistor driving-pulse chaotically fluctuates …” „… reduction [28]. The followings focus on the chaotic duty modulation. 7.4.1 Parameters of Analogue Signal …”

Effect of Central Frequency on EMI Reduction S. 30-43

„… . As one kind of spread spectrum modulation, the chaotic duty modulation is adopted to suppress …” „… normal PWM signal and the chaotic duty modulation signal, respectively. It is certified that the PWM …” „… . 4.2.1 Chaotic Duty Modulation As shown in Figure 2.5, the circuit is demonstrated for the chaotic duty …”

Tests of Input and Output Characteristics S. 83-87

„… in chaotic duty modulation. Chapter 6 probes the effects of chaotic modulation on the useful life of …” „… experimental tests about the effects of the chaotic modulation on efficiency, power factor, current harmonics …” „… of the latter. Hence, chaotic modulation will not affect the protection features. Meanwhile, safety …”

doi.org/10.51202/9783186850102

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Autonomous Systems 2017

Herwig Unger (ed.), Wolfgang A. Halang (ed.)

Series: Informatik/ Kommunikation

Volume 857 2017

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Yuhong Song, Zhong Li, Junying Niu, Wolfgang A. Halang Chaotic Central-frequency Modulation Effective for EMI Suppression in Switching Converters S. 166-173

„… electromagnetic interference (EMI) suppression in switching converters under chaotic duty modulation will be …” „… , realizing the chaotic duty modulation. With different central frequencies of chaotic signals, simulations …” „… Vref Fig. 4: The schematic diagram of chaotic duty modulation 172 Yuhong Song, Zhong Li, Junying Niu …”

doi.org/10.51202/9783186857101

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Suppressing Electromagnetic Interference in Switching-Mode Power Supplies by Chaotic Carrier Frequency Modulation

Junying Niu

Series: Informatik/ Kommunikation

Volume 851 2017

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Introduction S. 1-16

„… modulation and chaotic modulation are commonly used spread-spectrum techniques. 1.4.1 Periodic Carrier …” „… better EMI suppression effect. Consequently, randomized and chaotic modulation have been proposed. 1.4.2 …” „… modulation with variable duty cycle (RCFMVD) [38]: Tk changes; 4) randomized carrier frequency modulation …”

Analogue Chaotic Frequency PWM IC S. 64-77

„… analogue chaotic frequency PWM IC will be designed to facilitate the application of chaotic modulation, so …” „… chaotic modulation circuit has to be attached to PWM IC as a peripheral device, which is inconvenient for …” „… implement chaotic modulation on SMPS for EMI suppression. A UC3842-based CCM and a UCC3895-based VCM&CCM IC …”

Power Spectral Characteristics of CCFM-based Switching Converters S. 34-44

„… determine the effectiveness of chaotic modulation on EMI suppression. Coincided with the calculation results …” „… chaotic frequency PWM signal will be studied in this chapter to investigate the effectiveness of the …” „… reduction depends on the PDF and the randomness, called modulation degree, of the switching period, which …”

doi.org/10.51202/9783186851109

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