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POWER ELECTRONICS HANDBOOK, 3rd Edition by Muhammad Rashid

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Sliding-Mode Control of the PWM Audio Amplifier

The filter output voltage v0, divided by the amplifier gain (l/kv), must follow a reference vor. Defining the output error as ev0 = vor –kvv0, and also using its time derivatives (eθ,eγ,eβ) as a new state vector ε = [ev0, eθ, eγ, eβ], the system equations, in the phase canonical (or controllability) form, can be written in the form as follows

image (36.128)

Sliding-mode control of the output voltage will enable a robust and reduced-order dynamics, independent of semiconductors, power supply, filter, and load parameters. According to Eqs. (36.91) and (36.128), the sliding surface is

(36.129)

In ...

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