CN207219042U - Plasma loudspeaker based on series-resonant inverting technology - Google Patents
Plasma loudspeaker based on series-resonant inverting technology Download PDFInfo
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- CN207219042U CN207219042U CN201721136904.2U CN201721136904U CN207219042U CN 207219042 U CN207219042 U CN 207219042U CN 201721136904 U CN201721136904 U CN 201721136904U CN 207219042 U CN207219042 U CN 207219042U
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Abstract
Based on the plasma loudspeaker of series-resonant inverting technology, belong to stereo set field, for solving the problems, such as existing loudspeaker inversion module using thermal losses is higher, electric arc striking distance is shorter caused by parallel resonance driving, technical scheme is：Inversion module includes high-frequency step-up transformer, power module is used to supply power supply to each module, the audio signal through power amplification of power amplifier module output is coupled coil and couples and be modulated on the supply voltage of inversion module, the primary coil for the high-frequency step-up transformer being connected on inversion module and resonant capacitance LC loops in series, the LC loops are driven by the supply voltage and are operated in series resonance state to produce the alternating voltage equal with loop intrinsic frequency in the loop, the secondary coil of the high-frequency step-up transformer when LC loop works are in series resonance state coupled boost and discharge its electric current with audio signal change and change electric arc.
Description
Technical field
The utility model belongs to stereo set field, is related to a kind of plasma loudspeaker.
Background technology
Even to this day, the works of related plasma loudspeaker are only spread in worldwide between DIY amateurs
And technology.Shown according in online search, it is multifarious to be popular in the version in DIY fields now, but is asked below generally existing
Topic：In general plasma loudspeaker is mainly by these three module compositions of power module, power amplifier module and inversion module.
From power amplifier module, online version is nearly all to select A class power amplifiers, because it has circuit structure
Simply, the advantages of and tonequality is preferable, but be that operating efficiency is low the shortcomings that A class power amplifier maximums, generally below 50%, this will
Great power consumption is produced, causes to generate heat, reduces service life.
From inversion module, in various versions, most common have a version based on pulsewidth modulation (PWM), and
Version based on ZVT circuit (ZVS).Wherein, the version based on pulsewidth modulation (PWM) is to determine frequency arteries and veins with chip output
Bring and be driven, the shortcomings that its is maximum is to belong to hard switching circuit, and serious switching loss and band will be produced on power tube
Carry out the risk of high-voltage breakdown；And the version based on ZVT circuit (ZVS), its LC loops type of drive belong in parallel humorous
Shake driving, although there is the advantages of features simple structure and working stability, the output characteristics for having low voltage and high current, increase electric discharge
Thermal losses on loop, also shorten the striking distance of electric arc.
In addition, the tuning circuit that existing plasma loudspeaker is special because circuit design does not add so that play back
Sound timbre it is inferior, and audio can not adjust, and can not be used as business level product promotion.
Utility model content
In order to solve existing loudspeaker inversion module using thermal losses caused by parallel resonance driving is higher, breakdown of electric arc
The problem of distance is shorter, the utility model proposes following technical scheme：
A kind of plasma loudspeaker based on series-resonant inverting technology, including power module, power amplifier module, coupling
Coil and inversion module, described inversion module include high-frequency step-up transformer, and described power module is used to supply power supply extremely
Each module, the audio signal through power amplification of the power amplifier module output are coupled coil and couple and be modulated to inversion mould
On the supply voltage of block, primary coil and the resonant capacitance LC in series of the high-frequency step-up transformer being connected on inversion module are returned
Road, the LC loops by the supply voltage drive with produce the alternating voltage equal with loop intrinsic frequency in the loop with
Series resonance state is operated in, the secondary coil of the high-frequency step-up transformer is when the LC loop works are in series resonance state
Coupled boost simultaneously discharges the electric arc that its electric current changes and changed with audio signal.
Further, for receiving the tuning circuit module of audio signal, its be located at the front end of power amplifier module and with
Power amplifier module signal connects, and the tuning circuit module is also attached to power module.
Further, the tuning circuit module, audio signal input from its interface JP1, and audio signal is by potentiometer Rf1
Volume attenuation is adjusted, parallel resistance R3 between the crura intermedium and input pin of the potentiometer Rf1, audio signal is filtered via band logical
Ripple device is transferred in discharge circuit, and the bandpass filter includes electric capacity C1, draws among electric capacity C1 one end and the potentiometer
Pin and resistance R3 are all connected with, and electric capacity C1 other end connection resistance R1 one end, the resistance R1 other end connects the just defeated of amplifier
Enter, electric capacity C2 is in parallel with resistance R2, and one end in parallel is connected between resistance R1 and transport and placing device U1A positive input, in parallel
The other end is grounded, series capacitance C3, resistance R4 between the other end in parallel and transport and placing device U1A negative input；Described
Potentiometer Rf2 is connected between transport and placing device U1A negative input and output, electric capacity C4 is connected in parallel on Rf2 both ends, described current potential
Device Rf2 crura intermedium is connected to transport and placing device U1A output；Resistance R5 and transport and placing device U1A output and Rf2 crura intermedium connect
Connect, and electric capacity C5 series connections with it；As the first via：Resistance R6, potentiometer Rf3, resistance R7 are sequentially connected in series, and electric capacity C6 is parallel to
Potentiometer Rf3, and line, resistance R7 and potentiometer Rf3 of its both ends respectively positioned at resistance R6 and potentiometer Rf3 input pins export
The line of pin；As the second tunnel：Resistance R9, potentiometer Rf4, resistance R10 are sequentially connected in series, and electric capacity C7 is parallel to potentiometer Rf4,
And its both ends is respectively positioned at resistance R9 and the line of potentiometer Rf4 input pins, resistance R10 and potentiometer Rf4 output pins company
Line；As the 3rd tunnel：Resistance R11, potentiometer Rf5, resistance R12 are sequentially connected in series, and electric capacity C10 is parallel to potentiometer Rf5, and its
Both ends are respectively positioned at resistance R11 and the line of potentiometer Rf5 input pins, resistance R11 and potentiometer Rf5 output pins line；On
State the first via, the second tunnel, the parallel connection, and being connected with electric capacity C5 respectively of the 3rd tunnel；Resistance R7, R10, R12 are grounded；Potentiometer Rf3's
Crura intermedium is connected with electric capacity C8 one end；Potentiometer Rf4 crura intermedium is connected with electric capacity C9 one end；Potentiometer Rf5 centre
Pin series resistance R13, resistance R13 connect with electric capacity R13；Resistance R13, electric capacity R13, transport and placing device U1B positive input, electric capacity C8
The other end is connected to a bit；And this point of connection is connected with the line of the electric capacity C8 other end with the C9 other end；Described
Transport and placing device U1B positive input ground connection, it exports terminating resistor R14 and is grounded.
Further, the inversion module is the inverter circuit of serial-resonant, including high-frequency step-up transformer, four fields
Effect pipe U1, U4, U5, U6, described four FETs U1, U4, U5, U6 are connected to form H bridges, the original of high-frequency step-up transformer
Coil is connected with electric capacity C11 to form LC loops, and current transformer T1 is serially connected in LC loops, and its secondary coil is connected to NOT gate
Chip U2A, described U2A output-parallel two-way, wherein NOT gate chip U3B is connected all the way, another way connection NOT gate chip U2B
And NOT gate chip U3A, the two-way connect and drive gate drive transformer T2 primary coil, four of gate drive transformer T2
Secondary coil is connected on H bridges between the gate-source of four FETs.
Further, resistance R8, diode D1 negative electrode are in series between current transformer T1 NAND gate chips U2A
And diode D2 anode is both connected between resistance R8 NAND gate chips U2A；Diode D1 anode connects 5V voltages, diode
D2 minus earth.
Further, the series capacitance C12 between NOT gate chip U3A and gate drive transformer T2 primary coil, and
Diode D3 negative electrode and diode D4 anode are both connected between NOT gate chip U3A and electric capacity C12；Diode D3 anode
Connect 5V voltages, diode D4 minus earth.
Beneficial effect：It is series-resonant inverting technology that the utility model, which changes existing parallel resonance technology, with showing
Some plasma loudspeakers are compared, and system can be caused to realize the output of high voltage low current, so as to effectively reduce discharge loop
On thermal losses, and increase the striking distance of electrical discharge arc.The utility model adds tuning circuit module, improves existing each
The problem of lower tone, audio can not adjust in the plasma loudspeaker of kind version.The utility model uses the power of D class power amplifiers
Pipe, it is operated on off state, more efficient, and D class power amplifiers have the advantages of low in energy consumption.
Brief description of the drawings
Fig. 1 is structural schematic block diagram of the present utility model；
Fig. 2 is power module circuitry figure；
Fig. 3 is tuning circuit figure；
Fig. 4 is the circuit diagram of the D class power amplifier modules based on IRS2092 chips；
Fig. 5 is inversion module circuit diagram.
Embodiment
A kind of plasma loudspeaker based on series-resonant inverting technology, as shown in figure 1, being put including power module, power
Big module, coupling coil and inversion module, described inversion module include high-frequency step-up transformer, and described power module is used for
Power supply to each module, the audio signal through power amplification of the power amplifier module output is supplied to be coupled coil and couple and adjust
Make on the supply voltage of inversion module, primary coil and the resonant capacitance string of the high-frequency step-up transformer being connected on inversion module
Connection forms LC loops, and the LC loops are driven equal with loop intrinsic frequency to produce in the loop by the supply voltage
Alternating voltage to be operated in series resonance state, in the LC loop works connecting by the secondary coil of the high-frequency step-up transformer
During resonant condition coupled boost and discharge its electric current with audio signal change and change electric arc.
Further, for receiving the tuning circuit module of audio signal, its be located at the front end of power amplifier module and with
Power amplifier module signal connects, and the tuning circuit module is also attached to power module.
Wherein：
(1) power module：Comprising Switching Power Supply, Industrial Frequency Transformer, rectifier bridge, filter capacitor etc., to the civil power of input
220V alternating currents are handled, and corresponding voltage is supplied to them to ensure its normal operation (such as according to the demand of remaining module
Fig. 2).
(2) tuning circuit module：The design of specific reference tradition sound system, add tuning circuit (such as Fig. 3).Audio
Inputted from interface JP1, first pass through 10K potentiometer Rf1 and carry out Attenuation adjustable to volume, the crura intermedium and input pin of potentiometer it
Between 2.2K resistance R3 in parallel, when making volume adjusting for change curve when changing sound regulation in intermediate region more
Add and steadily be so advantageous to control.Then audio pass through by 1uF, 100pF electric capacity C1, C2,22k Ω, 47k Ω resistance R1,
The bandpass filter that R2 is formed, filter out hyperfrequency and the noise of ultralow frequency, the moderate sound frequency of reserve frequency, so as to tentatively change
Kind tonequality.Then audio is passed in discharge circuit, the cunning of amplifier chip NE5532, the 100k Ω by being described as " emperor of amplifier "
Dynamic rheostat Rf2 and 10k Ω resistance R4 is formed, and regulation Rf2 can adjust the gain of sound, in addition 22uF electric capacity C3,
4.7uF electric capacity C5 is used for the DC component isolated in audio, retains AC compounent；The 3.9K resistance R5 of amplifier output end series connection
The stabilization for contributing to circuit to work, and prevent from burning out chip when output end is short-circuited.Then, voice signal output is divided into three
Road, the first via meet R6 (1k Ω), Rf3 (50k Ω), R7 (1k Ω), C6 (100pF), and the second tunnel meets R9 (10k Ω), Rf4 (50k
Ω), R10 (10k Ω), C7 (1nF), the 3rd tunnel meet R11 (10k Ω), Rf5 (50k Ω), R12 (10k Ω), C10 (47nF)；From
The crura intermedium wiring of these three slide rheostats out concatenates C8 (3.3nF), C9 (22nF), R13 (10k Ω) and is followed by respectively
Together, then an electric capacity C13 (100pF) is connect, is then connected to another amplifier NE5532 input.This subelement is formed
One tuning network, regulation slide rheostat Rf3~Rf5 can control the decay of low frequency, intermediate frequency, high-frequency sound respectively, so that
Obtaining audio has adjustability.Finally, one 3.9k Ω of output end concatenation of amplifier resistance is connected on binding post JP2, as tune
The signal output part of sound module.
(3) power amplifier module：Sound equipment has been selected to make the D class power amplifier modules based on IRS2092 chips commonly used
(such as Fig. 4), because the power tube of D class power amplifiers is to be operated on off state, efficiency is more than 75%, and most of plasmas are raised one's voice
A classes, the power tube of AB class power amplifiers used in device are operated in amplification region, and efficiency is less than 50%, so comparing D classes power amplifier tool
There is the advantages of low in energy consumption.
(4) inversion module：The present embodiment using serial-resonant inverter circuit (such as Fig. 5).Circuit medium-high frequency liter
Primary coil of pressure transformer forms a LC loop with resonant capacitance C11, and module is responsible for producing frequency and this LC loop is intrinsic
The equal alternating voltage of frequency (about 200KHz), driving LC loop works are in series resonance state.JP5 in figure is binding post,
The output end of D class power amplifier modules is connected to, the voice signal of power amplifier module output is coupled to the 24V confessions of H bridges by coupling coil
On electric power line；H bridges are made up of four model IRFP4227 FET U1, U4, U5, U6, are driven and are become by high frequency boosting
The LC loops that depressor T4 primary coil and 300nF electric capacity C11 are formed；Current transformer T1 is serially connected on LC loops, will be returned
The current waveform on road feeds back to i.e. schmidt trigger NOT gate chip 7414 (U2)；Diode 1N4148 (D1 and D2) is here functioned as
To clamping action, by feedback signal voltage clamper in the range of 0~5V；Resistance R8 plays current-limiting protection effect, prevents from feeding back
The excessive damage diode of electric current returned；Feedback signal exports two-way opposite in phase, frequency etc. respectively after 7414 shaping
Driving chip TC4427 (U3) is defeated by the square-wave signal of feedback signal；TC4427 is used for driving gate drive transformer (T2)
Primary coil, and four secondary coils are then connected on H bridges in the gate-source of four FETs, for being driven with square-wave signal
Dynamic FET；Diode D3, D4, D5, D6 effect are equally to be used for clamper；330nF electric capacity C12 is for isolated DC point
Amount, retain AC compounent.The high-frequency step-up transformer directly driven in figure is released electric arc by final module.
The course of work of the plasma loudspeaker based on series-resonant inverting technology described in the present embodiment is as follows：
Power module is first handled the civil power 220V alternating currents of input, is supplied according to the demand of remaining module to them
Corresponding voltage is to ensure overall normal operation；Audio signal is connected to the input of tuning circuit first, and tuning circuit is to input
Audio signal carry out preliminary regulation (filtering, noise reduction, tuning etc.), then export and be transmitted to power amplifier module；Power amplification
Module is responsible for the audio signal after tuning resume module carrying out power amplification, then exports by coupling coil coupling modulation to inverse
Become on the supply voltage of module；Inversion module is responsible for producing 200KHz or so high-power high-frequency alternating current, driving high frequency boosting
Transformer boost releases electric arc to volt voltages up to ten thousand, and in discharge end (i.e. air ionization)；Now when the electricity of inversion module
When source voltage is by audio signal coupling modulation, the electric current of electric arc can change as audio signal changes, so as to shake air hair
Go out sound.
Scheme has the advantages that in the embodiment：
1. the design of a secondary design specific reference tradition sound system, adds tuning circuit, improves existing various versions
The problem of lower tone, audio can not adjust in this plasma loudspeaker.
2. substituting A classes, AB class power amplifiers with D classes power amplifier, power consumption is largely reduced.
3. series-resonant inverting technology is combined, the plasma loudspeaker (power with the version based on pulsewidth modulation (PWM)
Pipe is operated in hard switching state) to compare, the power tube of the design is operated in Sofe Switch state, so as to reduce the switch of power tube
Loss, so as to reduce heating；Compared with the version based on ZVT circuit (ZVS), series-resonant inverting can be relatively low
The output of high voltage low current is realized under supply voltage, so as to effectively reduce the thermal losses on discharge loop, while is also increased
The striking distance of electrical discharge arc so that the sound that sends is bigger apparent.
It is described above, the only preferable embodiment of the invention, but the protection domain of the invention is not
This is confined to, any one skilled in the art is in the technical scope that the invention discloses, according to the present invention
The technical scheme of creation and its inventive concept are subject to equivalent substitution or change, should all cover the invention protection domain it
It is interior.
Claims (7)
1. a kind of plasma loudspeaker based on series-resonant inverting technology, including power module, power amplifier module, coupling line
Circle, it is characterised in that also include high-frequency step-up transformer, described power module including inversion module, described inversion module
Coil coupling is coupled for supplying power supply to each module, the audio signal through power amplification of the power amplifier module output
And it is modulated on the supply voltage of inversion module, primary coil and the resonance electricity of the high-frequency step-up transformer being connected on inversion module
Hold LC loops in series, the LC loops are driven equal with loop intrinsic frequency to produce in the loop by the supply voltage
Alternating voltage to be operated in series resonance state, the secondary coil of the high-frequency step-up transformer is being gone here and there in the LC loop works
Join resonant condition when coupled boost and discharge its electric current with audio signal change and change electric arc.
2. the plasma loudspeaker as claimed in claim 1 based on series-resonant inverting technology, it is characterised in that for receiving
The tuning circuit module of audio signal, it is located at the front end of power amplifier module and is connected with power amplifier module signal, described
Tuning circuit module is also attached to power module.
3. the plasma loudspeaker as claimed in claim 2 based on series-resonant inverting technology, it is characterised in that the tuning
Circuit module, audio signal are inputted from its interface JP1, and audio signal is adjusted by potentiometer Rf1 to volume attenuation, the potentiometer
Parallel resistance R3 between Rf1 crura intermedium and input pin, audio signal is transferred in discharge circuit via bandpass filter, described
Bandpass filter includes electric capacity C1, and electric capacity C1 one end is all connected with the potentiometer middle pin and resistance R3, electric capacity C1's
Other end connection resistance R1 one end, the positive input of resistance R1 other end connection amplifier, electric capacity C2 is in parallel with resistance R2, and simultaneously
One end of connection is connected between resistance R1 and transport and placing device U1A positive input, the other end in parallel ground connection, described in parallel another
Series capacitance C3, resistance R4 between end and transport and placing device U1A negative input；
Potentiometer Rf2 is connected between described transport and placing device U1A negative input and output, electric capacity C4 is connected in parallel on Rf2 both ends, institute
The potentiometer Rf2 stated crura intermedium is connected to transport and placing device U1A output；
Resistance R5 is all connected with transport and placing device U1A output and Rf2 crura intermedium, and electric capacity C5 series connections with it；
As the first via：Resistance R6, potentiometer Rf3, resistance R7 are sequentially connected in series, and electric capacity C6 is parallel to potentiometer Rf3, and its two
End is respectively positioned at resistance R6 and the line of potentiometer Rf3 input pins, resistance R7 and potentiometer Rf3 output pins line；
As the second tunnel：Resistance R9, potentiometer Rf4, resistance R10 are sequentially connected in series, and electric capacity C7 is parallel to potentiometer Rf4, and its
Both ends are respectively positioned at resistance R9 and the line of potentiometer Rf4 input pins, resistance R10 and potentiometer Rf4 output pins line；
As the 3rd tunnel：Resistance R11, potentiometer Rf5, resistance R12 are sequentially connected in series, and electric capacity C10 is parallel to potentiometer Rf5, and
Its both ends is respectively positioned at resistance R11 and the line of potentiometer Rf5 input pins, resistance R11 and potentiometer Rf5 output pins line；
The above-mentioned first via, the second tunnel, the 3rd tunnel are in parallel respectively, and are connected with electric capacity C5；
Resistance R7, R10, R12 are grounded；
Potentiometer Rf3 crura intermedium is connected with electric capacity C8 one end；Potentiometer Rf4 crura intermedium is connected with electric capacity C9 one end；
Potentiometer Rf5 crura intermedium series resistance R13, resistance R13 connect with electric capacity R13；Resistance R13, electric capacity R13, transport and placing device
U1B positive input, the electric capacity C8 other end are connected to a bit；And this point of connection and the line and C9 of the electric capacity C8 other end
The other end be connected；
Described transport and placing device U1B positive input ground connection, it exports terminating resistor R14 and is grounded.
4. the plasma loudspeaker as claimed in claim 1 based on series-resonant inverting technology, it is characterised in that the inversion
Module is the inverter circuit of serial-resonant, including high-frequency step-up transformer, four FET U1, U4, U5, U6, described four
To form H bridges, primary coil of high-frequency step-up transformer is connected with electric capacity C11 to form for individual FET U1, U4, U5, U6 connection
LC loops, current transformer T1 are serially connected in LC loops, and its secondary coil is connected to NOT gate chip U2A, described U2A output
Two-way in parallel, wherein connecting NOT gate chip U3B all the way, another way connection NOT gate chip U2B and NOT gate chip U3A, the two-way connects
Connect and drive gate drive transformer T2 primary coil, gate drive transformer T2 four secondary coils are connected to four fields on H bridges
Between the gate-source of effect pipe.
5. the plasma loudspeaker as claimed in claim 4 based on series-resonant inverting technology, it is characterised in that mutual in electric current
Resistance R8 is in series between sensor T1 NAND gate chips U2A, diode D1 negative electrode and diode D2 anode are both connected to electricity
Between resistance R8 NAND gate chips U2A；Diode D1 anode connects 5V voltages, diode D2 minus earth.
6. the plasma loudspeaker based on series-resonant inverting technology as described in claim 4 or 5, it is characterised in that non-
Series capacitance C12 between door chip U3A and gate drive transformer T2 primary coil, and diode D3 negative electrode and diode D4
Anode be both connected between NOT gate chip U3A and electric capacity C12；Diode D3 anode connects 5V voltages, diode D4 negative electrode
Ground connection.
7. the plasma loudspeaker as claimed in claim 1 based on series-resonant inverting technology, it is characterised in that the power
Amplification module is the D class power amplifier modules based on IRS2092 chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721136904.2U CN207219042U (en) | 2017-09-06 | 2017-09-06 | Plasma loudspeaker based on series-resonant inverting technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721136904.2U CN207219042U (en) | 2017-09-06 | 2017-09-06 | Plasma loudspeaker based on series-resonant inverting technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207219042U true CN207219042U (en) | 2018-04-10 |
Family
ID=61823237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721136904.2U Expired - Fee Related CN207219042U (en) | 2017-09-06 | 2017-09-06 | Plasma loudspeaker based on series-resonant inverting technology |
Country Status (1)
| Country | Link |
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| CN (1) | CN207219042U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286873A (en) * | 2018-11-13 | 2019-01-29 | 合肥工业大学 | A kind of plasma sound equipment |
| CN113483882A (en) * | 2021-06-29 | 2021-10-08 | 重庆长安新能源汽车科技有限公司 | Electric control sound generating device |
| RU2795676C1 (en) * | 2023-01-10 | 2023-05-05 | Александр Петрович Каратунов | Speaker filter |
-
2017
- 2017-09-06 CN CN201721136904.2U patent/CN207219042U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286873A (en) * | 2018-11-13 | 2019-01-29 | 合肥工业大学 | A kind of plasma sound equipment |
| CN113483882A (en) * | 2021-06-29 | 2021-10-08 | 重庆长安新能源汽车科技有限公司 | Electric control sound generating device |
| CN113483882B (en) * | 2021-06-29 | 2023-03-14 | 重庆长安新能源汽车科技有限公司 | Electric control sound generating device |
| RU2795676C1 (en) * | 2023-01-10 | 2023-05-05 | Александр Петрович Каратунов | Speaker filter |
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Granted publication date: 20180410 Termination date: 20180906 |