Application of spread spectrum for EMI reduction in class D amplifier

Wang, Haishi; Zhang, Bo; Sun, Jinsheng; Wang, Rui

doi:10.1109/icsict.2010.5667827

Cited by 8 publications

(4 citation statements)

References 6 publications

(1 reference statement)

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“…Implementing SSCG with a direct modulation voltagecontrolled oscillator has shown superior EMI reduction performance [23]. The primary modulation methods include periodic signal modulation [16], [17], random signal modulation [24], [25], and chaotic signal modulation [26], [27]. However, employing chaotic signal modulation requires large-area capacitors and inductors, which may not be suitable for motor drive circuits.…”

Section: Introductionmentioning

confidence: 99%

An EMI Reduction Charge Pump With a Hybrid Modulation Technique for Motor Drive Applications in 0.18 um BCD Process

Wen,

Ma,

Wang

2024

IEEE Access

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Reducing the impact of electromagnetic interference (EMI) on switching inverters is an essential part of improving the performance of motor drives. This paper proposed a charge pump circuit with a hybrid modulation method to reduce the EMI of motor drive chips. This innovative method uses a combination of coarse modulation and fine modulation. The periodic modulation technique is used as coarse modulation to alter the spread spectrum range, while the random modulation technique is used as fine modulation to slow down switching transitions by adjusting the delay of the oscillating signal edges. Additionally, a buffer circuit is proposed to restrict the charge and discharge current of the charge pump, thus reducing the EMI due to the rapid variation of the current peak. Theoretical analysis and MATLAB simulation have confirmed that the hybrid modulation method has a pronounced effect on reducing the EMI of the circuit. The proposed motor drive system has been designed and verified by a 0.18um BCD process, and the test results show that the proposed circuit can reduce the EMI by up to 20 dB compared to the non-modulated circuit. The motor driver chip area is 0.173mm 2 , and the power consumption is 5.677mW.INDEX TERMS EMI reduction, charge pump, hybrid modulation, output buffer circuit, oscillator.

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Section: Introductionmentioning

confidence: 99%

An EMI Reduction Charge Pump With a Hybrid Modulation Technique for Motor Drive Applications in 0.18 um BCD Process

Wen,

Ma,

Wang

2024

IEEE Access

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“…In order to increase efficiency, a sharp, rapidly switching square wave signal is required. It is often set to a fixed frequency, but for some amplifiers it can also be set to variable frequencies to benefit from spreading the emission into wider frequency bands by using spread spectrum techniques [1], [2]. Compared to traditional (fixed frequency mode) Class D amplifiers, the spread spectrum modulation offers some significant advantages, as the efficiency and low Total Harmonic Distortion + Noise (THD+N) are maintained, whereas electromagnetic emission of the generated electromagnetic interference (EMI) can be significantly reduced, as it will be further explained in this paper [3], [4].…”

Section: Introductionmentioning

confidence: 99%

Emission reduction in Class D audio amplifiers by optimizing spread spectrum modulation

Deutschmann

Winkler

Karaca

2015

2015 10th International Workshop on the Electromagnetic Compatibility of Integrated Circuits (EMC Compo)

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Due to their high efficiency compared to conventional Class AB amplifiers, Class D audio amplifiers have increasingly become the amplifier of choice especially for low power applications such as portable electronics. However, Class D amplifiers are still a major source of electromagnetic emission of the electronic applications in which they are used. In this paper the benefits of using spread spectrum techniques in order to reduce the emission of Class D audio amplifiers is highlighted. Based on IC-level measurement results of a 10W Mono Class D speaker amplifier, that allows to be synchronized to an external clock, it is shown how spread spectrum parameters like deviation, modulation frequency and modulation signal can be optimized in order to maximize the reduction of the emission.

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“…The spread spectrum technique has been applied to minimize the EMI in DC -DC Converters now a day [1,[3][4][5]9]. Now-a-days, several random switching schemes have been proposed in [1][2][3], [6][7][8], [10][11]. An excellent overview of EMC regulations and measurement of conducted noise has been published [3], [5] & [9].…”

Section: Introductionmentioning

confidence: 99%

Exploration of EMI in Buck Boost Converter – A Real Time Approach <sup></sup>

Janaki¹,

Kumar²

2014

AMM

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This paper explores the level of conducted EMI in a buck boost converter under a non linear load condition based on the CISPR 11 / Class A EMC standard. Here, the buck boost converter was designed to produce a constant output voltage irrespective of load conditions. The closed loop control is designed using dsPIC controller. Three different randomization firing schemes are adopted and the EMI analysis in each mode is done experimentally. Also, the results are compared with normal PWM scheme. The experimental result shows that in RPWM scheme the emission levels are comparatively low.

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Application of spread spectrum for EMI reduction in class D amplifier

Cited by 8 publications

References 6 publications

An EMI Reduction Charge Pump With a Hybrid Modulation Technique for Motor Drive Applications in 0.18 um BCD Process

An EMI Reduction Charge Pump With a Hybrid Modulation Technique for Motor Drive Applications in 0.18 um BCD Process

Emission reduction in Class D audio amplifiers by optimizing spread spectrum modulation

Exploration of EMI in Buck Boost Converter – A Real Time Approach <sup></sup>

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