CN201336649Y

CN201336649Y - Audio power amplifier

Info

Publication number: CN201336649Y
Application number: CNU2009200884399U
Authority: CN
Inventors: 郭新中
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-02-06
Filing date: 2009-02-06
Publication date: 2009-10-28
Anticipated expiration: 2019-02-06

Abstract

The utility model discloses an audio power amplifier which comprises an input transformer, a power amplification circuit and an output transformer, wherein the power amplification circuit consists of a rectifying circuit and a plurality of amplification units connected in series with the output terminal of the rectifying circuit; each amplification unit consists of two triodes; the collector electrodes and the emitter electrodes of the two triodes are electrically connected through resistors respectively; the base electrode of either triode is electrically connected with the base electrode of the other triode through a resistor and a secondary winding of the input transformer; and the emitter electrodes of the two triodes are electrically connected through a resistor. The audio power amplifier has the advantage that the requirements for the capacity of the filtering capacitor and the current resistance of the rectifier diode in the power amplification circuit are reduced under the condition that the rated output power is not changed, thereby increasing the rated output power of the audio power amplifier on the premise of ensuring the play sound quality while greatly reducing the manufacturing cost and the idle energy consumption of the high-power audio power amplifier.

Description

Audio-frequency power amplifier

Technical field

The utility model relates to power amplifier, especially relates to audio-frequency power amplifier.

Background technology

Audio-frequency power amplifier is widely used in audio-frequence player device.Because it is 50 hertz civil power that the power supply of audio-frequence player device adopts frequency more, therefore, increase along with the audio-frequency power amplifier rated output power, the anti-flow valuve of the capacity of filter capacitor, rectifier diode also will increase thereupon and improve in its current rectifying and wave filtering circuit, this has not only improved the manufacturing cost and the unloaded power consumption of product, and increase to several ampere-hours when output current, taking to increase the filter capacitor capacity, to improve filter effect not obvious, influence acoustical quality, limited the raising of audio-frequency power amplifier rated power.

The utility model content

The utility model purpose is to provide a kind of low cost of manufacture, audio-frequency power amplifier that power output is big.

For achieving the above object, the utility model can be taked following technical proposals:

Audio-frequency power amplifier described in the utility model, it comprises input transformer, power amplification circuit, output transformer; Described power amplification circuit is made of rectification circuit and a plurality of amplifying units that are series at described rectification circuit output end; Described each amplifying unit is formed by two triodes; The collector electrode of two triodes is electrically connected by resistance respectively with emitter; The base stage of a triode is electrically connected with the base stage of another triode by a secondary winding of resistance, input transformer; The emitter of two triodes is electrically connected by resistance.

The number that is series at the amplifying unit of described rectification circuit output end is an even number; The mid point of the series circuit of being made up of described even number amplifying unit is electrically connected with the primary coil of described output transformer by coupling capacitance.

The utility model advantage is that described power amplification circuit is set to be made of rectification circuit and a plurality of amplifying units that are series at described rectification circuit output end; Therefore, under the identical condition of output rated power, anti-flow valuve to the filter capacitor capacity in the power amplification circuit, rectifier diode requires lower, thereby make and guaranteeing to play under the preceding topic condition of tonequality, the rated output power of audio-frequency power amplifier is improved, and greatly reduces the manufacturing cost of high-power audio power amplifier and the power consumption when unloaded simultaneously.

Description of drawings

Fig. 1 is circuit theory diagrams of the present utility model.

Fig. 2 is the schematic block circuit diagram of Fig. 1.

Embodiment

As shown in the figure, audio-frequency power amplifier described in the utility model, it comprises input transformer T1, power amplification circuit, output transformer T2; Described power amplification circuit is made of full-wave bridge rectifier circuit and four amplifying units 1 of being series at described full-wave bridge rectifier circuit output; Described each amplifying unit is formed by two triode BG1, BG2; The collector electrode of two triode BG1, BG2 is electrically connected by resistance R 3, R4 respectively with emitter; The base stage of triode BG1 is electrically connected with the base stage of triode BG2 by the secondary winding N2 of resistance R 2, input transformer T1; The emitter of two triode BG1, BG2 is electrically connected by resistance R 6; The mid point of the series circuit of being made up of described four amplifying units 1 is electrically connected with the primary coil of described output transformer T2 by coupling capacitance C1.

Claims

1, a kind of audio-frequency power amplifier, it comprises input transformer (T1), power amplification circuit, output transformer (T2); It is characterized in that: described power amplification circuit is made of rectification circuit and a plurality of amplifying units (1) of being series at described rectification circuit output end; Described each amplifying unit is formed by two triodes (BG1, BG2); The collector electrode of two triodes (BG1, BG2) is electrically connected by resistance (R3, R4) respectively with emitter; The base stage of triode (BG1) is electrically connected with the base stage of triode (BG2) by a secondary winding (N2) of resistance (R2), input transformer (T1); The emitter of two triodes (BG1, BG2) is electrically connected by resistance (R6).

2, audio-frequency power amplifier according to claim 1 is characterized in that: the number that is series at the amplifying unit (1) of described rectification circuit output end is an even number; The mid point of the series circuit of being made up of described even number amplifying unit (1) is electrically connected with the primary coil of described output transformer (T2) by coupling capacitance (C1).