How does the Class H Power Amplifier Module work?

The working principle of Class H power amplifier module is mainly based on its efficient power management and dynamic voltage regulation technology, which can achieve a balance between high sound quality and low power consumption.

1. Complementary symmetrical circuit structure
The Class H power amplifier adopts a complementary symmetrical circuit structure, using a differential pair structure at the input end to amplify the positive and negative half-cycles of the signal, and using a common-emitter pair structure at the output end to superimpose the signal, thereby effectively suppressing nonlinear distortion and ensuring the quality of the output signal. This design makes the Class H power amplifier have small output waveform distortion and good linear characteristics when the input signal amplitude changes.

2. Dynamic power management
The Class H power amplifier automatically switches the power supply voltage according to the amplitude change of the input signal by dynamically adjusting the output voltage. At low power output, a lower supply voltage is used to reduce power consumption; at high power output, it switches to a higher supply voltage to meet the demand. This dynamic power management technology significantly improves efficiency while reducing unnecessary power consumption and heat dissipation.

3. ±150V dual power supply
In some Class H power amplifier circuits, the final amplifier uses a ±150V dual power supply. When the output power is low, positive and negative power supplies are used; when the output power is high, it automatically switches to only positive power supply. This design enables the output tube to operate in a high voltage and large dynamic range, thereby further improving efficiency and sound quality.

4. Low voltage threshold process technology
Modern Class H amplifier modules usually use low voltage threshold process technology, which can smoothly convert the lowest power supply voltage to any discrete output voltage, thereby accurately matching the actual output requirements. This technology not only improves efficiency, but also saves additional power consumption.

5. Switching mode amplification technology
Class H amplifiers use "switching mode" amplification technology to cut the audio signal into multiple small fragments, each of which is amplified and output by a switch, and then recombined into a complete audio signal. This technology can effectively reduce distortion while improving efficiency.

6. Combination of high efficiency and low distortion
Class H amplifiers combine the advantages of Class AB and Class D amplifiers: Class AB amplifiers provide smooth sound quality, while Class D amplifiers are characterized by high efficiency and low distortion. By dynamically adjusting the power supply voltage and using complementary symmetrical circuits, Class H amplifiers achieve efficient energy utilization while maintaining high sound quality.