Design of closed loop audio power amplifiers by means of an accurate model of vented box loudspeakers

González-Espín, Fran; Figueres, E.; Garcerá, G.; Sandia, J.

doi:10.1109/epe.2007.4417717

Cited by 1 publication

(2 citation statements)

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“…On the other hand, the quantizer limits the SNR according to (8), where N e is the effective number of bits used to code the input signal, and could be calculated according to (9), n is the ADC number of bits, FSR is the ADC full scale range in volts and V acpk-pk) is the peak to peak voltage of the ADC input signal in volts.…”

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confidence: 99%

“…t is well known that the analysis of the open loop gain frequency response of a closed loop controller allows the designers to study the dynamic response as well as the stability of the system [1,2]; for that reason, the loop gain is usually measured in the design procedure of the controllers, obtaining Nyquist plots [3,4] or their equivalent Bode plots [5][6][7][8][9]. Both of them allow measuring the phase and gain margins, which in turn gives information about the bandwidth and the stability of the process, among other important parameters.…”

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confidence: 99%

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Measurement of the Loop Gain Frequency Response of Digitally Controlled Power Converters

González-Espín

Figueres

Garcerá

et al. 2010

IEEE Trans. Ind. Electron.

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The study of the loop gains frequency response in a power converter is a powerful tool commonly used for the design of the controllers used in the control stage. As the control of medium and high power electronic converters is usually performed digitally, it is useful to find a method to measure the digital loop gains. The purpose of this paper is to present a method for properly measuring the loop gain frequency response of digitally controlled power converters by means of an analog Frequency Response Analyzer (FRA). An analog sinusoidal reference signal generated by the FRA is injected through an Analog to Digital Converter (ADC) into the digital controller, and added to the discrete feedback signal. To obtain the frequency response of the open loop gain, both feedback and disturbed feedback signals are sent back to the FRA by using the Pulse Width Modulation (PWM) peripherals of the controller.

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confidence: 99%