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Class TD power circuit is one of the most popular power circuits today. So what is a Class TD power circuit? What are the advantages and uses? Let’s find out through the article below.
What is class TD power circuit?
TD (abbreviation: Tracking Class D ) refers to the combination of the Class D amplifier circuit used to generate the self-correcting supply voltage of the output signal in the class AB amplifier.
So the Class TD power circuit is a standard class AB amplifier with greatly improved efficiency. Higher efficiency is achieved by adding two switch-mode converters to reduce power loss in the amplifier.
Furthermore, the TD supply to the single-voltage AB amplifier will monitor the output audio signal with a bias of approximately +6V or -6V .
Working principle of TD . power circuit
The operating principle is based on the switch-mode topology used in TD supplies: “Step down” or “Buck Converter”.
– Then, the current in the Buck Converter, the switching transistor (FET) is controlled by the PWM signal. The “Wall” input voltage in the amplifier and the output voltage is the supply for class AB.
– When the FET transistor turns on, current flows in one direction through the FET, the inductor and the load. When the FET is turned off, the voltage across the inductor will reverse and current will continue to flow through the free energy switching diode. If the FET is switched on continuously the output voltage will be the same as the input voltage. But if the FET is off the output voltage will be zero.
If the signal duty cycle is 50% then the output voltage will be half the input voltage in the buck converters. Then, the Buck converters will convert the energy, the power in the converter is equal to the source out of the converter.
Example: The converter is switched at 50% of the pulse cycle. The input voltage of the converter is 160V , the input current is 10A . From there, the input power is 1600W. This will give an output voltage of 80V and a current of 20A and an output power of 1600W .
Uses of class TD . circuit
The first stage of the circuit acts as an AB amplifier and works with + or – 6 Volt power. The output will then act as a filter to reduce the noise from the TD supplies.
The LC filter in the circuit, when operating in a reactive load, the energy enters the gain and is processed in the active circuit stage. From there, it shows that class TD will be a combination of class AB and D to optimize power and deliver more efficient sound when emitted.
Advantages of class TD . power circuits
- High operating efficiency 70% so very energy saving.
- Provides the same sound characteristics as in a Class AB amplifier.
- Low output impedance at high frequency, good frequency response.
- High output capacity can operate bridge mode.
- Low noise and distortion.
- High reliability, good load handling of audio response.
With the above information, hope to help you better understand the class TD power circuit. If you have any questions, please let us know in the comments
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