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Switching Power Converters, 2nd Edition by Dorin O. Neacsu

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4

Carrier-Based Pulse Width Modulation and Operation Limits

4.1    CARRIER-BASED PULSE WIDTH MODULATION ALGORITHMS: HISTORICAL IMPORTANCE

Figure 3.2 shows the principle of pulse width modulation (PWM) control, but it does not provide any information on how we can produce the modulation within a real hardware circuitry. In order to keep the pulse frequency constant, a carrier signal is necessary. Switches change their conduction states at moments of time that are determined by the intersections between our reference voltage and a triangular high-frequency signal with a fixed magnitude equal to unity. This operation is shown in Figure 4.1.

The frequency of the pulses is kept constant while their duty cycle is modulated. This is known as

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