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What are AD & BD modulations stand for in the Class-D amplifier modulation technique?
Hi,
I came acroos a lot about AD & BD modulations in class-D amplifiers, but I cannot find an answer to what are AD & BD stand for. Do you know what are they stand for...
You are right. The Q factor can be extracted from the transfer function, right. E.g. the second-order system mentioned in the reference you sent, the Q factor appears in the coefficient of "s". So in my case, the 4 order, how do I find the Q factor so that I can set the Q=0.707, cut-off...
Hi,
Thanks for the reply. I added a series resistor with C_BTL, so it does reduce the peak. But lower C_BTL increases the peak, so I increase the C_BTL instead of reducing it.
After adding a series resistor with C_BTL, the system becomes the 4th order. The transfer function becomes very...
Hi,
I am designing an LC filter with a cut-off frequency of 20 kHz for the Class-D amplifier. The filter schematic is shown in Fig.1 top right. I understand how to choose the LC values for the critically damped case for the pure resistive load as shown in Fig. 2.
The problem is I want to...
In your simulation, aren't your comparators' input signs (left side & right side) are opposite to one another? i.e., if the left comparator non-inverting input is connected to the sine wave, then the right side connects to inverting input.
Is your modulation BD modulation? it looks AD...
Is it because of control scheme or the dead time? If it is, the pure resistive load PWM above would be wrong too, but that PWM is Ok. The control scheme is simple as compare reference sine signal with the triangle wave.
Hi,
I am simulating this BTL configured H-Bridge inverter with BD modulation. When there is only a resistor load, the three-level PWM pattern is fine (VoutA-VoutB, resistor only). But after adding an LC filter, the PWM pattern is not correct (VoutA-VoutB, LC filter), the filtered sine wave is...
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