We are a professional audio company integrating R&D, production and sales. We have been focusing on the production of mixers, active power amplifiers, microphones, and related electronic components and equipment for many years.
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Precipitation of more than 20 years of technical design
OEM / ODM /B2B
24-hour one-stop service
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We have a strong R & D team that can develop and produce products according to the drawings or samples provided by customers.
We have two own foundries and processing factories, factory direct sales, high quality and low price.
We have our own laboratory and advanced testing equipment in the industry to ensure product quality.
Based on the high-grade and high-end market, our products meet international standards and are mainly exported to Europe, America, Japan and other countries.
1. High efficiency and energy savingClass H Loudspeaker Amplifier dynamically adjusts the power supply voltage by monitoring the input signal amplitude in real time. For example, low voltage is used for power supply when the signal is low, and high voltage is switched to when the signal peak is high, which greatly reduces static power consumption. Its efficiency can reach 70%-90%, which is much higher than Class AB (about 50%-65%) and Class A (about 20-30%), and close to Class D level. Class G requires multiple sets of fixed power supplies to achieve voltage switching, while Class H reduces system complexity through continuously adjustable power supplies, reducing the cost and volume problems caused by multiple power supplies. The output stage transistor voltage drop of Class H amplifier is minimized, avoiding the energy waste of Class AB amplifier at low power. 2. Sound quality and linearityClass H Loudspeaker Amplifier inherits the linear amplification principle of Class AB and eliminates crossover distortion through dynamic bias technology. Class D is prone to high-frequency noise and EMI interference due to switching modulation, while Class H can achieve high-fidelity output without complex filtering. In music or theater systems, Class H can accurately handle instantaneous large dynamic signals and avoid the transient noise problem of Class D during high-voltage switching. 3. Heat dissipation and stabilityThe efficient operation of Class H Loudspeaker Amplifier reduces energy loss and has lower heat dissipation requirements than Class A and Class AB. At the same power, the volume of Class H heat sink can be reduced by 50%, which is suitable for compact equipment. Class G may generate local high temperature due to multiple power switching, while Class H optimizes heat distribution through continuous voltage regulation.
1. Bias setting and crossover distortion eliminationThe class AB amplifier sets the static bias current so that the output transistor is in a weak conduction state when there is no signal, thereby compensating for the high power consumption of class A and the crossover distortion problem of class B.Bias voltage compensation: Introduce a diode, resistor or constant current source between the base of the transistor to provide a bias voltage of about 0.7V to ensure that the transistor is not completely turned off near the signal zero point.Crossover distortion suppression: By turning on the transistor in advance, the signal discontinuity problem caused by alternating switches in the class B amplifier is eliminated, and the positive and negative half-cycle waveforms transition smoothly. 2. Switching of working modesSmall signal mode (class A characteristics): When the input signal is small, the transistor is continuously turned on, maintaining linear amplification and achieving low distortion.Large signal mode (class B characteristics): When the signal amplitude increases, the transistor is only turned on in the part exceeding the half cycle, reducing static power consumption and increasing efficiency to 50%-70%. 3. Circuit design and implementationPush-pull output stage: complementary symmetrical NPN and PNP transistors are used to amplify the positive and negative half-cycles of the signal respectively.Temperature stability design: The influence of temperature changes on transistor parameters is offset by thermal elements (such as thermistors) or feedback circuits to avoid the problem of "heat runaway".Single power supply optimization: some circuits are designed through capacitor coupling or voltage divider to achieve symmetrical output under single power supply and reduce costs. 4. Performance advantagesHigh fidelity and low distortion: combined with the linear advantages of Class A, the total harmonic distortion (THD) is lower than Class B (typical value <1%).Efficiency improvement: compared with Class A (efficiency 20%-30%), Class AB efficiency can reach 50%-70%, which is suitable for medium and high power scenarios.Wide applicability: compatible with multiple types of loads (such as speakers, headphones), suitable for home theater, car audio and other scenarios.
1. Balance between efficiency and sound qualityClass AB Loudspeaker Amplifier combines the working modes of Class A and Class B. When there is no signal or a small signal, the output transistor remains in a slightly conductive state (similar to Class A) to reduce crossover distortion; and switches to Class B mode when there is a large signal to improve efficiency. Its efficiency can usually reach 50%-70%, which is significantly higher than Class A (20%-30%). Distortion control By introducing a small bias current, Class AB amplifiers effectively reduce the obvious crossover distortion problem in Class B amplifiers. 2. Structure and working principleClass AB Loudspeaker Amplifier adopts a dual-transistor complementary push-pull structure. The positive and negative half-cycle signals are amplified by different transistors respectively, avoiding the high energy consumption problem of continuous conduction of a single tube, while optimizing the signal linearity.When a small signal is input, the transistor works in Class A mode to ensure low distortion; when a large signal is input, it automatically switches to Class B mode to improve efficiency. This dynamic adjustment allows it to adapt to the needs of different loads and signal strengths. 3. Wide application scenariosClass AB Loudspeaker Amplifier is widely used in home theaters, professional audio systems and car audio due to its low distortion and high linearity, especially for scenes with high sound quality requirements. Compared with the high-frequency noise problem of Class D amplifiers, Class AB amplifiers are stable at medium and high power outputs (such as 30W-200W), and are suitable for driving high-sensitivity speakers.
Phone
+86-18815298889
Tel
+86-574-87781767
Fax
+86-574-87787735
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Xiyun Road, Xiepu, Zhenhai, Ningbo, Zhejiang, China
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