RU182702U1 - UNIVERSAL POWER AMPLIFIER OF SOUND FREQUENCY - Google Patents

Abstract

The invention relates to a sound reinforcing technique, in particular to power amplifiers for audio signals. The technical result consists in providing the possibility of a single-channel amplification mode. The audio signal power amplifier contains two identical amplification channels. At the input of each channel is a phase inverter, the input of which forms the input of the amplification channel. The input of the first channel amplifier is connected to the non-inverting output of the phase inverter, and the input of the second channel amplifier is connected to the inverting output. Moreover, the output of the first amplifier of each channel forms a non-inverting output of the amplification channel, and the output of the second amplifier forms an inverting output of the amplification channel. In this case, the amplifier is loaded onto four loudspeakers, two of which form a pair and are connected to the combined non-inverting outputs of the channels by the beginnings of their voice coils. Two other loudspeakers form another pair and the ends of their voice coils are connected to the combined inverting outputs of the channels. Other conclusions of coils in each pair of loudspeakers are connected one to the common wire, the other to the free conclusion of the loudspeaker from another pair. Between the inputs of the gain channels, an initially closed switch is introduced. Both amplification channels are loaded onto one loudspeaker connected by the beginning of its voice coil to the combined non-inverting outputs of the channels, and the end to the combined inverting outputs of the channels. 1 ill.

Description

Technical field

The invention relates to a sound-amplifying technique, in particular, to power amplifiers of audio frequency signals made using monolithic, discrete or mixed technologies.

The purpose of the utility model is to expand the operational capabilities of the device.

This goal is achieved by introducing the possibility of implementing a single-channel amplification mode, which will allow implementing a larger number of speaker load connection options, including implementing a double bridge circuit when connecting one speaker to the pairwise coupled amplification channel outputs, providing a four-fold increase in the reproduced signal power, for which between the channel inputs an initially closed switch was introduced, and both gain channels are loaded on one loud Oritel connected beginning of its voice coil to the combined non-inverting outputs of the channels, and end - to the combined outputs of the inverting channel.

Description of analog

The known power amplifier of audio frequency signals (UMZCH), containing two identical amplification channels, each of which is formed by the first amplifier of the channel, the input of which is the input of the channel, and the output is the non-inverting output of the channel, while the power amplifier is loaded on four speakers, which are paired with their voice coils are connected to the outputs of the channels, other outputs of the coils in each pair of speakers are connected one to the common wire, the other to the free output of the speaker from another pair [1, p. 209, fig. 7.5].

The indicated option for connecting a load consisting of four loudspeakers implements the so-called Pseudo-Quadraphon decoder. At the same time, two complex signals are fed to the inputs of the two-channel device, in which the signals of four sound transmission channels are encoded in the total-difference way: left, right, central and surround. Connecting four loudspeakers to two device outputs allows decomposing complex signals into four initial components. However, the known device has only two outputs, the signals of which are in phase with each other, which limits the number of options for connecting a loudspeaker load.

Prototype description

It is known an amplifier device containing two identical amplification channels, a phase inverter is located at the input of each channel, the input of which forms the input of the amplification channel, the input of the first channel amplifier is connected to the non-inverting output of the phase inverter, and the input of the second channel amplifier identical to the first is connected to the inverting one, the output of the first the amplifier of each channel forms a non-inverting output of the amplification channel, and the output of the second amplifier forms an inverting output of the amplification channel, while the amplifier is loaded with four g loudspeakers, two of which form a pair and with the beginnings of their voice coils are connected to the combined non-inverting outputs of the channels, two other loudspeakers form another pair and the ends of their sound coils are connected to the combined inverting outputs of the channels, the other outputs of the coils in each pair of loudspeakers are connected one to the common wire, another - to the free output of the speaker from another pair [2].

The known prototype device has two outputs in each gain channel, the signals of which are out of phase with each other. The indicated option for connecting a load consisting of four loudspeakers implements the Pseudo-Quadraphon decoder with doubled signal power in each loudspeaker.

Prototype criticism

The reasons that impede the achievement of the required technical result when using the known device include limited operational capabilities, due to the ability to work only in the two-channel amplification mode, which limits the number of speaker connection options and, therefore, does not exhaust user requirements with a modern variety of load configurations of professional and household purpose.

Utility Model Essence

The problem to which the claimed utility model is directed is to expand the operational capabilities of the device.

This problem is solved due to the achievement in the implementation of a useful model of a technical result, which consists in introducing the possibility of implementing a single-channel amplification mode, which will allow to realize a larger number of speaker load connection options, including implementing a double bridge circuit when connecting a single speaker to coupled outputs of amplification channels providing a fourfold increase in the power of the reproduced signal.

The specified technical result is achieved by the fact that an initially closed switch is inserted between the inputs of the amplification channels, and both amplification channels are loaded onto one loudspeaker, connected by the beginning of its voice coil to the combined non-inverting outputs of the channels, and the end to the combined inverting outputs of the channels.

The analysis of the prior art by the applicant, including a search by patent and scientific and technical sources of information, made it possible to establish that the applicant did not find an analogue characterized by features identical to all the essential features of the claimed utility model, and determining the prototype as the closest in the totality from the identified analogues features, allowed to determine the set of essential in relation to the technical result of the features in the claimed object, set forth in the formula of the utility model.

Therefore, the claimed utility model meets the requirement of "novelty."

List of drawings

The figure shows a structural diagram of an amplifier with connecting a load variant that implements a connection scheme for one loudspeaker with a combination of channel outputs. The following notation is used in the figure diagram: 1 — first amplification channel; 2 - input of the first amplification channel; 3 - phase inverter of the first amplification channel; 4 - the first amplifier of the first amplification channel; 5 - the second amplifier of the first amplification channel; 6 - non-inverting output of the first amplification channel; 7 - inverting output of the first amplification channel; 8 - the second channel of amplification; 9 - input of the second amplification channel; 10 - phase inverter of the second amplification channel; 11 - the first amplifier of the second amplification channel; 12 - the second amplifier of the second amplification channel; 13 - non-inverting output of the second amplification channel; 14 - inverting output of the second amplification channel; 15 - switch, the closure of which combines the inputs of the channels for the implementation of a single-channel amplification mode.

The figure shows one loudspeaker indicating the beginning and end of its voice coil connected to the combined outputs of the channels.

Information confirming the feasibility of implementing a utility model

Information confirming the feasibility of implementing the utility model with obtaining the above technical result is as follows.

The figure shows the structure of the proposed device UMSZCH, with versatility with respect to the connection of the load, both in the two-channel amplification mode and in the single-channel mode, which is determined by the position of the movable contact of the introduced switch 15. The amplifier contains two channels that are completely identical to each other: the first channel 1 and the second channel 8. Each channel has its own input (2 or 9), a phase inverter (3 or 10), a first channel amplifier (4 or 11), a second channel amplifier identical to the first (5 or 12) and two outputs: a non-inverting output d (6 or 13) and inverting (7 or 14). As a load UMZCH used one loudspeaker.

The amplifier in single-channel mode provides receiving at each of its four outputs signals of the same intensity and identical to each other, having pairs of opposite phases.

The modes of connecting signal sources are set by switching sources to one and / or another input of the amplifier. With the open position of the switch 15 and the supply of two different signals to each of the inputs (2 or 9), a two-channel operation mode is formed - “Two-channel mode”. When the switch 15 is open and a signal is input to the input of one of the channels (2 or 9), a single-channel operation mode is formed - “Single-channel mode”. When the switch 15 is closed and the signal is input to one of the channels (2 or 9), an operating mode is formed - “Parallel single-channel mode”.

Connecting a loudspeaker between the outputs of amplifiers of one channel operating in antiphase (bridge switching) allows you to double the power received in the load. We note the simplicity of obtaining a bridge connection of loudspeakers in each channel of the proposed device, and the shoulders of the bridge are completely symmetrical and excited in parallel by identical, but antiphase signals.

When bridging two separate UMZCH or two amplifiers included in the two-channel UMZCH prototype, the series excitation of the amplifiers that make up the shoulders of the bridge is usually used: the signal from the output of one amplifier is fed to the input of the other, while one of the amplifiers should work in inverse mode. This is achieved by the circuitry transfer of one of the amplifiers to the mode of operation with the inversion of the output signal, while the introduction of additional circuit elements is also required to achieve symmetry of the bridge arms, etc. The disadvantages of such circuits are a decrease in output power with increasing frequency, and most importantly, the occurrence of nonlinear distortions, which is not available in the proposed UMHCH due to the use of parallel excitation and the presence of full symmetry of the bridge arms.

The proposed UMZCH allows you to simply and without reducing the quality of work to obtain a bridge connection not only of one loudspeaker in each channel, but also of all four amplifiers when working in parallel single-channel amplification mode, working on one loudspeaker included in the double bridge circuit (see figure). In the latter case, four times power is allocated to the load with respect to the power of one channel amplifier.

From the above it is obvious that the introduction of the possibility of implementing a single-channel amplification mode, will allow to implement a larger number of options for connecting a loudspeaker load, and therefore expand the operational capabilities of the device.

Thus, the above information indicates the fulfillment of the following conditions when using the claimed utility model:

- a device embodying the claimed utility model in its implementation is intended for use in amplifiers of audio signals, and in particular in low-frequency amplifiers in a monolithic version and in power amplifiers in a discrete version and made by mixed technology;

- for the claimed utility model in the form described in the utility model formula, the possibility of its implementation using the means and methods described above or known prior to the priority date is confirmed;

- a device embodying the claimed utility model in its implementation, is able to achieve the specified technical result.

Therefore, the claimed utility model meets the requirement of "industrial applicability" under applicable law.

Literature

1. Shikhatov A.I. Concert Hall on wheels. - M .: MDK Press, 2000 .-- 272 p.: Ill. (Fig. 7.5, p. 209 - prototype).

2. RF patent for utility model No. 164500 (RU 164500 U1). IPC HO3F 3/181 (2006.01). Application No. 2015151781/08, 02/02/2015. Published: September 10, 2016, Bull. Number 25.

Claims (1)

A universal power amplifier of audio signals containing two identical amplification channels, there is a phase inverter at the input of each channel, the input of which forms the input of the amplification channel, the input of the first channel amplifier is connected to the non-inverting output of the phase inverter, and the input of the second channel amplifier identical to the first is connected to the inverting one moreover, the output of the first amplifier of each channel forms a non-inverting output of the amplification channel, and the output of the second amplifier forms an inverting output of the amplification channel, while The amplifier is loaded onto four loudspeakers, two of which form a pair and are connected to the combined non-inverting outputs of the channels by the beginnings of their voice coils, two other loudspeakers form another pair and by the ends of their sound coils are connected to the combined inverting outputs of the channels, one coil output in each pair of loudspeakers is connected to the common wire, the other to the free output of the loudspeaker from another pair, characterized in that between the inputs of the amplification channels introduced initially closed switch, and both the channel gain loaded on one loudspeaker connected beginning of its voice coil to the combined non-inverting outputs of the channels, and end - to the combined outputs of the inverting channel.

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