A Low-EMI, High-Reliability PWM-Based Dual-Phase LED Driver for Automotive Lighting

Qu, Yong; Shu, Wei; Chang, Joseph S.

doi:10.1109/jestpe.2018.2812902

Cited by 27 publications

(10 citation statements)

References 24 publications

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“…100 kHz, though typically not tolerated by car manufacturers in on-board applications due to the associated EMI [6], [7]. EMI from power electronics can obstruct correct operation of other units in the vehicle and in extreme cases cause other systems such as field-bus systems or radio communications to fail [5], [8]. In consequence, whereas wide-band-gap devices increase the technically achievable switching frequencies and converter power densities [9], those developments do not reach the automotive world, which often even limit the allowable switching frequency due to EMI concerns.…”

Section: Output Controlmentioning

confidence: 99%

Synchronous Multistep Predictive Spectral Control of the Switching Distortion in DC--DC Converters

Korte¹,

Luetje²,

Goetz³

2022

Preprint

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In automotive power electronics, distortion and electromagnetic interference (EMI) generated by the switching action of power semiconductors can be a significant challenge for the design of a compact, lightweight vehicle. As semiconductor switching frequencies increase, e.g., through the introduction of new materials, such as gallium nitride and silicon carbide, this problem becomes more severe. We present a control scheme for an automotive dc-to-dc converter that reduces the EMI generated by shaping switching distortion predictively at the run time. The multistep model-predictive control scheme chooses the subsequent switching state that optimizes the output spectrum according to predefined criteria. To achieve real-time operation, it evaluates the possible switching state candidates for the next modulation step without explicitly solving a single Fourier transform. In addition, the switching rate and voltage ripple are controlled in a single unified control law. We present and experimentally validate that the control scheme can indeed run at real time already with currently available mid-range hardware. The results demonstrate that the largest spectral peak of the switching distortion can be decreased by 48 dB compared to conventional pulse-width modulation. Furthermore, spectral gaps can be implemented in the output distortion and altered in realtime, allowing certain frequency bands-e.g., bands used by other sensitive electronics such as sensors, communication busses, or tuners-to be kept free of EMI from the converter's switching actions.

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Section: Output Controlmentioning

confidence: 99%

Synchronous Multistep Predictive Spectral Control of the Switching Distortion in DC--DC Converters

Korte¹,

Luetje²,

Goetz³

2022

Preprint

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“…But this paper only provides experimental waveforms within a dimming range of 20% to 80%. Subharmonic oscillation is eliminated in [24] by using average current control (ACC). Besides, the dual-phase mode is employed to achieve good current balance and small current ripples.…”

Section: Illumination Control and Visible Light Communication (Vlc)mentioning

confidence: 99%

Full-Range LED Dimming Driver With Ultrahigh Frequency PWM Shunt Dimming Control

Wang

Hou

et al. 2020

IEEE Access

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This paper explores an ultrahigh dimming frequency Light-Emitting Diode (LED) pulse width modulation (PWM) shunt dimming driver that achieves the full-range dimming. Firstly, the dimming frequency is improved to 20kHz for avoiding flicker and audible noise in high dimming requirements application, such as film and television shooting. Secondly, this paper reduces dimming ratio loss at ultrahigh dimming frequency by removing output capacitor. As a result, given 1% dimming ratio is achieved. Subsequently, for improving LED current square waveform at ultrahigh dimming frequency, it is necessary to suppress parasitic oscillation at the falling edge in LED current. Therefore, this paper proposes a method which connects a fast recovery diode with LED in series. In such way, parasitic oscillation at the falling edge in LED current is suppressed. Meanwhile, linear dimming performance is improved such as dimming linearity of low ratio and circuit reliability. Finally, a 120 W experimental prototype is built to drive an LED array comprising 9 LEDs in parallel and 15 LEDs in series. The switching frequency and dimming frequency of prototype are 500 kHz and 20 kHz, respectively. In addition, it achieves full dimming range of 1% to 99.99%. INDEX TERMS Output capacitance, PWM shunt dimming, ultrahigh dimming frequency, full-range dimming, parasitic parameters.

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“…The use of LED is already recognized as a way to save energy reducing the CO 2 emissions [6], for this reason, the design of LED based systems is acquiring more interest. On the other hand, the LED supply is still a challenge in engineering world and among the solutions proposed in the literature, the state of the art is achieved with suitable DC/DC converters [7][8][9][10][11][12][13]. The DC/DC converter is the best choice in terms of efficiency and reliability, but the need to be very compact and often integrated into the lighting module itself, in particular for automotive applications, makes its design and its circuit layout more complex.…”

Section: Introductionmentioning

confidence: 99%

A Double Stage DC/DC Converter for LED Lighting Automotive Systems

Failla¹,

Vitale²

2024

RE&PQJ

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In this paper a DC/DC converter, conceived to be employed for LED lighting in automotive application, is proposed. It is composed of two stages to fit both to the constraint to be powered by a variable supply voltage and to deliver a constant output load current with reduced ripple to supply the LED. Firstly the LED has been experimentally characterized to obtain a model to be implemented on a circuit simulator. Then the design of the converter has been carried out, including the control laws, to verify the compliance with the constraints. Finally, a circuit based on commercial devices is proposed to be applied both to lighting and to direction indicators light, including current and temperature protection. Results, given in simulation, show good performance achievable with a low-cost hardware.

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A Low-EMI, High-Reliability PWM-Based Dual-Phase LED Driver for Automotive Lighting

Cited by 27 publications

References 24 publications

Synchronous Multistep Predictive Spectral Control of the Switching Distortion in DC--DC Converters

Synchronous Multistep Predictive Spectral Control of the Switching Distortion in DC--DC Converters

Full-Range LED Dimming Driver With Ultrahigh Frequency PWM Shunt Dimming Control

A Double Stage DC/DC Converter for LED Lighting Automotive Systems

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