In electrical engineering, commutation refers to the process of changing the direction of current flow in a circuit. There are various methods of commutation used in different applications. One of these methods is Class D commutation, which uses two leads.

Class D Commutation:
- Class D commutation is primarily used in power electronic circuits, specifically in switching amplifiers and power inverters.
- It is a method of commutation that utilizes pulse width modulation (PWM) to control the output waveform.
- The two leads in Class D commutation refer to the two output terminals of the power electronic circuit.

Explanation:
- In Class D commutation, the input signal is a high-frequency square wave, which is typically generated by a switching circuit.
- The two leads of the circuit are connected to the load, which can be a speaker, motor, or any other device.
- The square wave signal is modulated such that the duty cycle determines the average voltage applied to the load.
- By rapidly switching the voltage on and off, the desired waveform can be achieved.
- The two leads are responsible for carrying the switched voltage to the load and completing the circuit.

Advantages of Class D Commutation:
- Class D commutation offers high efficiency compared to other commutation methods.
- It allows for higher power handling capabilities due to the switching nature of the circuit.
- The use of pulse width modulation enables precise control over the output waveform, resulting in high-quality audio or power output.
- It is commonly used in audio amplifiers, where it provides higher power efficiency and reduced heat dissipation.

Conclusion:
- Class D commutation is a commutation method that utilizes two leads to carry the switched voltage to the load.
- It is commonly used in power electronic circuits such as switching amplifiers and power inverters.
- This method offers high efficiency, precise waveform control, and higher power handling capabilities compared to other commutation methods.