Power amplifier circuit powered by single power supply based on MOS transistor

Abstract

The invention discloses a power amplifier circuit powered by a single power supply based on an MOS transistor. The circuit comprises a power amplification circuit and an intermediate amplifier. The power amplification circuit is electrically connected with the intermediate amplifier, the power amplification circuit comprises a positive half-cycle power amplification circuit, a negative half-cyclepower amplification circuit and an impedance matching output transformer, and a class B single-power-supply transformer coupling push-pull power analog linear amplification circuit is formed by connecting power MOS single tubes or multiple tubes with the same characteristics in parallel; the intermediate amplifier comprises an output feedback detection circuit, a proportional integral differentiating circuit, a positive and negative half-cycle balance and crossover distortion correction circuit and a protected positive and negative half-cycle voltage follower circuit. The power amplifier circuit is directly installed in a power amplifier, a voltage type MOS tube is adopted as a power tube, a front end circuit is simple and reliable, universality is large, the size is small, reliability ishigh, power matching is simple, and the power amplifier circuit is particularly suitable for a broadcast power amplifier machine requiring alternating current and direct current, and full-power outputthe same as that of alternating current power supply is kept during direct current power supply.

Description

technical field [0001] The invention relates to the field of power amplifier circuits, in particular to a power amplifier circuit powered by a single power supply based on a MOS tube. Background technique [0002] At present, in ordinary class AB power amplifier circuits, the most commonly used power tube is a current-type power triode, which is usually used in pairs of NPN and PNP, and uses + / - dual power supply for power supply. For some applications that require DC power supply (such as fire emergency broadcasting Power amplifier, etc.), one is a built-in DC / DC conversion circuit, which converts a single DC power supply into a dual power supply, the DC power supply efficiency is low, the circuit is complicated, and the reliability is not high; the other is an external DC / AC inverter, which converts the DC After turning into alternating current, the power amplifier is powered, but the installation is inconvenient and the cost is high. [0003] In order to solve the above ...

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Problems solved by technology

[0002] At present, in ordinary class AB power amplifier circuits, the most commonly used power tube is a current-type power triode, which is usually used in pairs of NPN and PNP, and uses +/- dual power supply for power supply. For some applications that require DC power supply (such as fire emergency broadcasting Power amplifier, etc.), one is a built-in DC/DC conversion circuit, which converts a single DC power supply into a dual power supply, the DC power supply efficiency is low, the circuit is complicated, and the reliability is not high; the other is an external DC/AC inverter, which converts the DC After turning into alternating current, it supplies power to the power amplifier, but the installation is inconvenient and the cost is high

[0003] In order to s

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