CN210431844U

CN210431844U - Electron tube pushing amplification output circuit

Info

Publication number: CN210431844U
Application number: CN201921696840.0U
Authority: CN
Inventors: 苏韶辉
Original assignee: Shenzhen Leikaite Technology Co Ltd
Current assignee: Shenzhen Leikaite Technology Co Ltd
Priority date: 2019-10-11
Filing date: 2019-10-11
Publication date: 2020-04-28
Anticipated expiration: 2029-10-11

Abstract

The utility model belongs to the technical field of electron tube power amplifying circuit, in particular to an electron tube pushing amplifying output circuit, which comprises a loudspeaker, a first same class B push-pull power amplifying circuit, a second same class B push-pull power amplifying circuit, a first same transformer T1 and a second same transformer T2, two same class B push-pull amplifying output transformer bridge connection output modes are adopted, the output of one electron tube B type push-pull power amplifying circuit is the mirror image output of the other electron tube B type push-pull power amplifying circuit, i.e. the input voltages applied to the two transformers are 180 deg. out of phase, so that the voltage difference across the loudspeakers connected to the outputs of the two transformers is a single double, the output power is a quadruple, therefore, the loudspeaker obtains higher output power, the power utilization rate is improved, and the market demand of high-power sound box equipment is met.

Description

Electron tube pushing amplification output circuit

Technical Field

The utility model belongs to the technical field of electron tube power amplification circuit, especially, relate to an electron tube promotes and amplifies output circuit.

Background

The conventional electron tube power amplification circuit for driving a loudspeaker generally adopts a class b push-pull power amplification circuit, as shown in the attached figure 3 of the specification, an audio signal is divided into two paths of signals with opposite phases to be output and respectively sent to two electron tubes forming the class b push-pull power amplification circuit, namely, a positive phase signal and a negative phase signal are amplified by the two electron tubes respectively and then output to two ends of a primary winding of a transformer, and a secondary winding of an output transformer is connected with the loudspeaker, so that the loudspeaker is driven.

Although the efficiency of the conventional class b push-pull power amplification circuit is very high, the power utilization rate is not high, wherein the power utilization rate is improved, that is, under the action of a lower power supply voltage, a load obtains higher output power, and therefore, the design of the electron tube amplification circuit with high output power is required by the market.

SUMMERY OF THE UTILITY MODEL

To prior art's not enough, this utility model provides an electron tube promotes amplifies output circuit utilizes BTL power amplifier principle, analogizes by two the same second and draws power amplifier circuit to constitute, through the mode of dual output transformer bridging output, obtains 2 times voltage of original output on making the load, obtains 4 times output promptly to the audio amplifier equipment of adaptation high power.

In order to achieve the above object, the utility model provides an electron tube promotes and amplifies output circuit, including speaker, the same first class b push-pull power amplifier circuit and the same second class push-pull power amplifier circuit, and the same first transformer T1 and second transformer T2, wherein the audio signal that 180 ° of phase difference was imported to first class b push-pull power amplifier circuit and second class B push-pull power amplifier circuit, the both ends of first transformer T1 primary winding are connected respectively to the output of the amplifying element of first class b push-pull power amplifier circuit, the both ends of second transformer T2 primary winding are connected respectively to the output of the amplifying element of second class B push-pull power amplifier circuit, and the secondary winding of first transformer T1 and second transformer T2 all sets up the tap, the speaker is installed between two secondary winding taps.

As a further improvement of the electron tube driving amplification output circuit of the present invention: the first class B push-pull power amplification circuit and the second class B push-pull power amplification circuit are respectively composed of two electron tubes which are at least identical and are alternatively conducted.

As a further improvement of the electron tube driving amplification output circuit of the present invention: the primary windings of the first transformer T1 and the second transformer T2 are tapped.

Advantageous effects

The utility model relates to an electron tube promotes amplification output circuit, analogize two the same electron tubes second and draw the amplification circuit bridging after, the output is drawn in the bridging of rethread dual output transformer, one of them electron tube second analogizes to draw power amplification circuit's output is another electron tube second and analogizes to draw power amplification circuit's mirror image output, the input voltage phase difference that adds on two transformers promptly, make the both ends voltage difference that inserts the speaker on two transformer output be solitary twice, output is four times promptly, thereby let the speaker obtain higher output, promote the power utilization ratio, satisfy the market demand of high power audio amplifier equipment.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a circuit diagram of the present invention;

FIG. 3 is a prior art circuit diagram;

in the figure: 1. the system comprises a first class B push-pull power amplification circuit, a second class B push-pull power amplification circuit, a loudspeaker and a control circuit.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

The utility model provides a pair of electron tube promotes amplifier output circuit, including speaker 3, the same second class of two characteristics is analogized and is pushed up power amplifier circuit and the same transformer of two characteristics, wherein the audio signal phase difference that two second classes of characteristics are the same are pushed up power amplifier circuit input 180, the signal voltage size of inputing on the same transformer primary winding of characteristic through enlarging equals, the phase difference is 180, then output signal voltage is the same size on the transformer secondary winding equals, the phase difference is 180, 3 both ends voltage difference values of speaker between the transformer secondary winding is its twice, output is four times promptly, thereby let speaker 3 obtain higher output.

Specifically, as shown in fig. 2, the electron tube with the model number 6L6GC is selected, the first class-b push-pull power amplifier circuit 1 includes a third electron tube V3 and a fifth electron tube V5, the No. 5 terminals (input ends) of the third electron tube V3 and the fifth electron tube V5 are respectively connected to the audio ac signal, the No. 3 terminals (first anodes) of the third electron tube V3 and the fifth electron tube V5 are respectively connected to both ends of the primary winding of the first transformer T1, the No. 1 terminals (first cathodes) and the No. 2 terminals (second cathodes) of the third electron tube V3 and the fifth electron tube V5 are all shorted and grounded through a sixteenth resistor R16, a twenty-second resistor R22 and a twelfth capacitor C12 connected in parallel, the No. 4 terminals (second anodes) of the third electron tube V3 and the fifth electron tube V5 are connected together, the No. 7 terminals (filament H2) of the third electron tube V3 and the fifth electron tube V468 are connected to the power supply terminal (power supply terminal H1), the tap is led out from the primary winding of the first transformer T1, and is connected to the terminal No. 4 (second anode) of the third electron tube V3 and the fifth electron tube V5 through a twenty-fourth resistor R24, and simultaneously the tap is connected between the tap and the terminal No. 4 (second anode) of the third electron tube V3 through an H1 and an eighteenth resistor R18, and the H1 is grounded through a seventeenth resistor R17 and a third capacitor C3 which are connected in parallel, and the seventeenth resistor R17 and the third capacitor C3 which are connected in parallel form a filter circuit for filtering out ac interference, wherein the H1 and the H2 provide filament power for the electron tubes, one end of the primary winding of the first transformer T1 is grounded, and the other end is used for feedback. The third lamp V3 and the fifth lamp V5 are respectively operated for a half cycle during one cycle of the audio ac signal and alternately operated, thereby driving the first transformer T1;

correspondingly, the second push-pull power amplifying circuit 2 includes a fourth valve V4 and a sixth valve V6, the No. 5 terminals (input terminals) of the fourth valve V4 and the sixth valve V6 are respectively connected to the audio ac signal, the No. 3 terminals (first anodes) of the fourth valve V4 and the sixth valve V6 are respectively connected to both ends of the primary winding of the second transformer T2, the No. 1 terminals (first cathodes) and the No. 2 terminals (second cathodes) of the fourth valve V4 and the sixth valve V6 are both short-circuited and connected to the ground through a twentieth resistor R20, a twenty-third resistor R23 and a thirteenth capacitor C13 connected in parallel, the No. 4 terminals (second anodes) of the fourth valve V4 and the sixth valve V65 are connected together, the No. 7 terminals (power source terminals) of the fourth valve V4 and the sixth valve V6 are connected to the H6, the filament (filament H1) of the fourth valve V4 and the sixth valve V6 are connected to the power source terminal (power source terminal H1), the tap is led out from the primary winding of the second transformer T2, and is connected to the 4 th terminal (second anode) of the fourth electron tube V4 and the sixth electron tube V6 through a twenty-fifth resistor R25, and the H1 enters a twenty-first resistor R21 and is connected between the tap and the 4 th terminal (second anode) of the fourth electron tube V4, and the H1 is grounded through a nineteenth resistor R19 and a fourth capacitor C4 which are connected in parallel, and the nineteenth resistor R19 and the fourth capacitor C4 which are connected in parallel form a filter circuit for filtering alternating current interference, wherein the H1 and the H2 provide filament power for the electron tubes, one end of the primary winding of the second transformer T2 is grounded, and the other end is used for feedback. The fourth lamp V4 and the sixth lamp V6 are respectively operated for a half cycle during one cycle of the audio ac signal and alternately operated, thereby driving the second transformer T2.

However, the phase difference between the audio signals accessed by the first push-pull type power amplifying circuit 1 and the second push-pull type power amplifying circuit 2 is 180 degrees, the amplified audio signals generated by the first transformer T1 and the second transformer T2 also have the phase difference of 180 degrees, so that the voltage difference between the audio signals led out from the taps of the first transformer T1 and the taps of the second transformer T2 and accessed to the loudspeaker 3 is twice of the amplitude value of the audio signals, the output power is four times, the loudspeaker 3 obtains higher output power, and the utilization rate of a power supply is improved.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent changes without departing from the technical scope of the present invention.

Claims

1. An electron tube push amplifying output circuit, comprising: the loudspeaker comprises a loudspeaker, a first class B push-pull power amplifying circuit, a second class B push-pull power amplifying circuit, a first transformer T1 and a second transformer T2, wherein the first class B push-pull power amplifying circuit and the second class B push-pull power amplifying circuit are identical, audio signals with the phase difference of 180 degrees are input into the first class B push-pull power amplifying circuit and the second class B push-pull power amplifying circuit, the output ends of amplifying elements of the first class B push-pull power amplifying circuit are respectively connected with two ends of a primary winding of the first transformer T1, the output ends of amplifying elements of the second class B push-pull power amplifying circuit are respectively connected with two ends of a primary winding of the second transformer T2, taps are arranged on secondary windings of the first transformer T1 and the second transformer T2, and the loudspeaker is installed between the taps of the.

2. The electron tube push amplifying output circuit according to claim 1, wherein: the first class B push-pull power amplification circuit and the second class B push-pull power amplification circuit are respectively composed of two electron tubes which are at least identical and are alternatively conducted.

3. A tube push amplifying output circuit according to claim 2, wherein: the primary windings of the first transformer T1 and the second transformer T2 are tapped.