CN207625464U - Stereo Switch power supply - Google Patents
Stereo Switch power supply Download PDFInfo
- Publication number
- CN207625464U CN207625464U CN201721735128.8U CN201721735128U CN207625464U CN 207625464 U CN207625464 U CN 207625464U CN 201721735128 U CN201721735128 U CN 201721735128U CN 207625464 U CN207625464 U CN 207625464U
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- China
- Prior art keywords
- switching
- circuit
- switching circuit
- signal
- power supply
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of Stereo Switch power supplys, including audio amplifier circuit, power switch driving circuit, switching circuit, transformer, low-pass filter, its switching circuit portion is in addition to the switching circuit as Switching Power Supply, it can also be as the switching circuit of digital audio frequency power amplifier, on-off action is carried out according to the switching signal for being loaded with audio signal received from power switch driving circuit, and then control transformer, it includes the pulse electrical signal of the audio signal to make transformer output, pulse electrical signal again after low-pass filtered processing output to loud speaker, to drive the speaker sounding.Since Switching Power Supply and digital audio frequency power amplifier are multiplexed a switching circuit, so as to reduce by a switching circuit, reduce the power attenuation that a switching circuit just reduces level switching circuit, to make digital audio frequency power amplifier and Switching Power Supply combination whole efficiency to greatly improving.
Description
Technical field
The utility model is related to switch power technology more particularly to a kind of Stereo Switch power supplys.
Background technology
The end of the nineties in last century, Tripath companies of the U.S. propose digital audio frequency power amplifier (i.e. digital audio power
Amplifier) concept, and then it is proposed the D classes power amplifier (i.e. digital audio frequency power amplifier) for being named as " class T power amplifiers ".From
This, digital audio frequency power amplifier begin to it is gradually a wide range of use, power amplification efficiency is from original 70% 85%- till now
90%, it is greatly improved.And it switching mode that digital audio frequency power amplifier uses in type of drive and existing opens
The operation principle in powered-down source is similar.In audio area, the prior art is to carry out power amplification using digital audio frequency power amplifier,
It is powered by Switching Power Supply.Digital audio frequency power amplifier other analog amplifiers and low-frequency power compared with the combination of Switching Power Supply
(use Industrial Frequency Transformer) although combination it is many in efficiency, weight, volume etc. progress, in volume miniaturization, carry
High efficiency is optimized to present aspect and can not further improve, to reach development bottleneck.
Utility model content
The utility model provides a kind of Switching Power Supply, to improve the combination of digital audio frequency power amplifier and Switching Power Supply
Efficiency.The utility model is achieved by the following technical solution：
A kind of Stereo Switch power supply, including the audio amplifier circuit, power switch driving circuit, the switch that are sequentially connected are electric
Road, transformer and low-pass filter；
The power switch driving circuit is for generating the switching signal for driving the switching circuit；
The audio amplifier circuit is connect with the power switch driving circuit, for receiving audio signal, and will be described
It is sent in the power switch driving circuit after audio signal amplification, to be modulated to the switching signal, is loaded
There is the switching signal of the audio signal；
The power switch driving circuit connect with the switching circuit, for being loaded with the audio signal by described
Switching signal is sent to the switching circuit, to drive the switching circuit break-make；
The output end of the switching circuit is connect with the input terminal of the transformer, and the switching circuit is used for logical by it
The disconnected control transformer exports corresponding pulse electrical signal；
The input terminal of the low-pass filter is connect with the output end of the transformer, and the low-pass filter is for receiving
The pulse electrical signal, and exported to loud speaker after the pulse electrical signal is carried out low-pass filtering.
Further, the power switch driving circuit is half-bridge forward converter or half-bridge resonance circuit.
Further, the switching circuit is metal-oxide-semiconductor field effect transistor.
Compared with prior art, Stereo Switch power supply provided by the utility model, switching circuit portion are removed as switch
Outside the switching circuit of power supply, additionally it is possible to as the switching circuit of digital audio frequency power amplifier, electricity is driven according to from power switch
What road received is loaded with the switching signal progress on-off action of audio signal, and then controls transformer, makes transformer output packet
Pulse electrical signal containing the audio signal, output is to loud speaker after low-pass filtered processing again for pulse electrical signal, to drive
Loud speaker sounding.Since Switching Power Supply and digital audio frequency power amplifier are multiplexed a switching circuit, opened so as to reduce one
Powered-down road reduces the power attenuation that a switching circuit just reduces level switching circuit, to make digital audio power put
The whole efficiency of the combination of big device and Switching Power Supply to greatly improving.
Description of the drawings
Fig. 1 is the composed structure schematic diagram for the Stereo Switch power supply that the utility model embodiment provides.
Specific implementation mode
To make the purpose of this utility model, technical solution and advantage be more clearly understood, with reference to embodiment and attached drawing,
The utility model is described in further detail.
As shown in Figure 1, the Stereo Switch power supply that the utility model embodiment provides includes the audio amplification electricity being sequentially connected
Road 1, power switch driving circuit 2, switching circuit 3, transformer 4 and low-pass filter 5.Wherein：
Power switch driving circuit 2 is used to generate the switching signal of driving switch circuit 3.Audio amplifier circuit 1 and power supply
Switch driving circuit 2 connects, and for receiving audio signal, and power switch driving circuit 2 is sent to after audio signal is amplified
In, to be modulated to switching signal, obtain the switching signal for being loaded with audio signal.Switching signal is a kind of pulse signal,
Its frequency and amplitude are fixed.When using modulates audio signals switching signal, sound is indicated by the duty ratio of regulating switch signal
The power of frequency signal, then the duty ratio of switching signal is low by force for audio signal, and the duty ratio of the weak then switching signal of audio signal is high, adjusts
The continually changing switching signal of duty ratio will be obtained after system, and audio signal is indicated by the variation of duty ratio in switching signal,
To make audio signal be loaded into modulated signal.Audio signal is usually that amplitude is 0-1Vpp (peak values of ac voltage)
Signal, frequency 20Hz-20KHz, audio signal are reversely transported to audio amplifier circuit 1.Power switch driving circuit 2 can be half
The topological structure of bridge or normal shock, preferably half-bridge forward converter or half-bridge resonance circuit.
Power switch driving circuit 2 is connect with switching circuit 3, for the switching signal for being loaded with audio signal to be sent to
Switching circuit 3, with 3 break-make of driving switch circuit.The output end of switching circuit 3 is connect with the input terminal of transformer 4, switching circuit
3 export corresponding pulse electrical signal for controlling transformer 4 by its break-make.The input terminal of low-pass filter 5 and transformer 4
Output end connects, and low-pass filter 5 carries out pulse electrical signal exporting after low-pass filtering for receiving pulse electrical signal to raising
Sound device 6.Transformer 4 can be amplified the power exported to loud speaker 6 by amplifying pulse electrical signal.Pulse electrical signal is base
It is generated in the break-make of switching circuit 3, it is corresponding to the break-make of switching circuit 3, and the break-make of switching circuit 3 is by being loaded with sound
The switching signal of frequency signal controls, therefore audio signal information is contained in pulse electrical signal.By pulse electrical signal through low
Bandpass filter 5 is reduced into original analog audio signal and exports to loud speaker 6, with 6 sounding of drive the speaker after filtering.Switch
The break-make of circuit 3 had both controlled transformer 4 and has outputed pulse electrical signal for 6 sounding of drive the speaker, while also making pulse electric
Audio signal information is contained in signal, it is seen then that switching circuit 3 is simultaneously as Switching Power Supply and digital audio frequency power amplifier
Switching circuit 3.Since Switching Power Supply and digital audio frequency power amplifier are multiplexed a switching circuit 3, opened so as to reduce one
Powered-down road 3 reduces the power attenuation that a switching circuit 3 just reduces level switching circuit 3, to make digital audio power
The whole efficiency of the combination of amplifier and Switching Power Supply to greatly improving.Switching circuit 3 is metal-oxide-semiconductor field effect transistor.
Above-described embodiment is only preferred embodiment, the protection domain being not intended to limit the utility model, new in this practicality
All any modification, equivalent and improvement etc., should be included in the protection of the utility model made by within the spirit and principle of type
Within the scope of.
Claims (3)
1. a kind of Stereo Switch power supply, which is characterized in that including audio amplifier circuit, the power switch driving electricity being sequentially connected
Road, switching circuit, transformer and low-pass filter；
The power switch driving circuit is for generating the switching signal for driving the switching circuit；
The audio amplifier circuit is connect with the power switch driving circuit, for receiving audio signal, and by the audio
It is sent in the power switch driving circuit after signal amplification, to be modulated the switching signal, obtains loading
State the switching signal of audio signal；
The power switch driving circuit is connect with the switching circuit, for by the switch for being loaded with the audio signal
Signal is sent to the switching circuit, to drive the switching circuit break-make；
The output end of the switching circuit is connect with the input terminal of the transformer, and the switching circuit is used to pass through its break-make control
It makes the transformer and exports corresponding pulse electrical signal；
The input terminal of the low-pass filter is connect with the output end of the transformer, and the low-pass filter is described for receiving
Pulse electrical signal, and exported to loud speaker after the pulse electrical signal is carried out low-pass filtering.
2. Stereo Switch power supply as described in claim 1, which is characterized in that the power switch driving circuit is half-bridge normal shock
Circuit or half-bridge resonance circuit.
3. Stereo Switch power supply as described in claim 1, which is characterized in that the switching circuit is metal-oxide-semiconductor field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721735128.8U CN207625464U (en) | 2017-12-13 | 2017-12-13 | Stereo Switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721735128.8U CN207625464U (en) | 2017-12-13 | 2017-12-13 | Stereo Switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207625464U true CN207625464U (en) | 2018-07-17 |
Family
ID=62823070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721735128.8U Expired - Fee Related CN207625464U (en) | 2017-12-13 | 2017-12-13 | Stereo Switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207625464U (en) |
-
2017
- 2017-12-13 CN CN201721735128.8U patent/CN207625464U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180717 Termination date: 20211213 |