Single-stage transformation digital amplifier

Abstract

The invention provides a single-stage transformation digital amplifier, and the digital amplifier comprises a switching power circuit, an energy recycling circuit, and a loudspeaker. The switching power circuit comprises K1 and K2 in series connection, capacitors C1 and C2 in series connection, a high-frequency transformer T1, rectification diodes D1 and D2, an inductor L1, a capacitor C3, and an electrolytic capacitor C4. The energy recycling circuit comprises K3, an inductor L2, and a freewheel diode D3. One end of K1 and one end of the capacitor C1 are connected with the positive electrode of a power supply E3, and one end of K2 and one end of the capacitor C2 are connected with the negative electrode of the power supply E3 and are also grounded. One end of K3 is connected between a connection point, formed by the rectification diodes D1 and D2, and the inductor L1, and the other end of K3 is grounded. One side, coupled to the inductor L1, of the inductor L2 forms a transformer structure. One end of the inductor L2 is grounded, and the other end of the inductor L2 is connected with the positive electrode of the power supply E3 through the freewheel diode D3. The digital amplifier is simple in circuit, is high in efficiency, and is low in cost.

Description

technical field [0001] The invention relates to the field of digital power amplifiers, in particular to a single-stage variable digital power amplifier. Background technique [0002] The digital power amplifier used for speakers is usually composed of two parts: a switching power supply module and a digital power amplifier module. For a long time, many scientific and technical personnel have been studying a topic, that is, using audio signals to modulate the switching power supply module. The switching power supply no longer outputs DC voltage. And directly output the amplified audio signal, and then avoid the digital power amplifier module, but the research in this field has achieved little in the past few decades. In 2004, Mr. Soren and Mr. Michael of the Technical University of Denmark published the paper "A high-performance, low-complexity control scheme for single-stage conversion audio power amplifier and DC-AC converter" (referred to as "Scheme") earlier realized the ...

AI Technical Summary

Problems solved by technology

[0002] The digital power amplifier used for speakers is usually composed of two parts: switching power supply module and digital power amplifier module. However, the amplified audio signal is directly output, thereby eliminating the need for a digital power amplifier module, but decades of research in this field have achieved little

In 2004, Mr. Soren and Mr. Michael of the Technical University of Denmark published the paper "A high-performance and low-complexity control scheme for single-stage conversion audio power amplifier and DC-AC converter" (referred to as "the scheme") earlier realized the above-mentioned topic, but the real circuit is extremely complicated. The actual circuit of each electronic switch is composed of circuit modules with multiple components. The components of the single-pole double-throw electronic switch are almost doubled, so the number of components in the whole circuit is very large.

In 2016, the SSA power amplifier (single-stage high-efficiency audio inverter) was proposed by Mr. Chen Xuejian, a Chinese-American. So it creates a more complex problem with the circuit

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