CN203537328U - Frequency-adjustable triangular wave power amplifier - Google Patents
Frequency-adjustable triangular wave power amplifier Download PDFInfo
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- CN203537328U CN203537328U CN201320709258.XU CN201320709258U CN203537328U CN 203537328 U CN203537328 U CN 203537328U CN 201320709258 U CN201320709258 U CN 201320709258U CN 203537328 U CN203537328 U CN 203537328U
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- zero
- crossing comparator
- triangular wave
- resistance
- power amplifier
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- 239000003381 stabilizer Substances 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 abstract description 7
- 230000000087 stabilizing effect Effects 0.000 abstract 3
- 230000003321 amplification Effects 0.000 abstract 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
- 230000010363 phase shift Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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Abstract
The utility model discloses a frequency-adjustable triangular wave power amplifier comprising a triangular wave generation circuit, a comparator, a switching amplification circuit and a low-pass filter which are sequentially connected. The triangular wave generation circuit comprises a first inductor, a second inductor, a first resistor, a second resistor, a first zero-crossing comparator and a second zero-crossing comparator, the first inductor and the second inductor are connected with a power input end, the first resistor is connected between the first inductor and the ground, the resistor is connected between the second inductor and the ground, a non-inverting input end of the first zero-crossing comparator is coupled with the power input end, a non-inverting input end of the second zero-crossing comparator is coupled with common terminals of the first inductor and the first resistor, an output end of the first zero-crossing comparator and an output end of the second zero-crossing comparator are respectively connected with an input end of a NAND gate, an output end of the NAND gate is coupled with a base electrode of a transistor, a capacitor and a voltage stabilizing tube are connected between a collecting electrode and an emitting electrode of the transistor, the voltage stabilizing tube is parallelly connected with the capacitor, and a cathode of the voltage stabilizing tube is serially connected with one resistor and then connected with an external power supply. The frequency-adjustable triangular wave power amplifier is simple in structure and less in interference, and output power is conveniently adjusted.
Description
Technical field
The utility model relates to a kind of power amplifier, especially relates to the adjustable triangular wave power amplifier of a kind of frequency.
Background technology
Power amplifier (English name: Power Amplifier), be called for short " power amplifier ", refer under given distortion rate condition, for example can produce maximum power output, to drive the amplifier of a certain load (loud speaker).Can power amplifier have played the pivotal role of " tissue, coordination " in whole sound system, dominating to a certain extent whole system good tonequality output is provided.D class (digital audio power) amplifier is a kind of pulse signal that input simulated audio signal or PCM digital information is transformed into PWM (pulse width modulation) or PDM (pulse density modulated), then with the pulse signal of PWM or PDM, remove to control high-power switch device on/off audio-frequency power amplifier, also referred to as switching amplifier.
Prior art intermediate cam wave generation circuit is to be to be transformed by waveforms such as square waves substantially, and the fixed frequency of triangular wave is easily disturbed and be unfavorable for adjusting power output.
Utility model content
In order to overcome the defect of prior art, the utility model proposes the adjustable triangular wave power amplifier of a kind of frequency, to reduce interference and to be convenient to adjust power output.
The utility model adopts following technical scheme to realize: the triangular wave power amplifier that a kind of frequency is adjustable, comprise connected successively triangle wave generating circuit, comparator, switch amplifying circuit and low pass filter, triangle wave generating circuit comprises: connect power input the first inductance and the second inductance, be connected to the first resistance between the first inductance and ground and be connected to the second resistance between the second inductance and ground, normal phase input end couples the first zero-crossing comparator of power input, normal phase input end is coupled in the second zero-crossing comparator of the first inductance and the first resistance common port, the output of the output of the first zero-crossing comparator and the second zero-crossing comparator connects respectively the input of NAND gate, and the output of NAND gate couples transistorized base stage, between transistorized collector electrode and emitter, be connected electric capacity and with the voltage-stabiliser tube of Capacitance parallel connection, and connect external power source after a resistance of the negative electrode of voltage-stabiliser tube serial connection.
Wherein, the negative-phase input of the first zero-crossing comparator is by resistance R 9 ground connection, and the negative-phase input of the second zero-crossing comparator is by resistance R 4 ground connection.
Wherein, transistor is N-type triode.
Compared with prior art, the utlity model has following beneficial effect:
The utility model is by improving triangle wave generating circuit, makes the frequency of triangular wave power amplifier can be with the frequency change of input ac power, thereby is convenient to adjust power output with the frequency change of input power.The utility model comes control capacitance to discharge and recharge to produce triangular wave by producing square-wave signal driving transistors conduction and cut-off, disturbs littlely and convenient and practical, can be applied in multiple occasion.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the utility model triangular wave power amplifier.
Fig. 2 is the circuit diagram of Fig. 1 intermediate cam wave generation circuit.
Embodiment
As shown in Figure 1, triangular wave power amplifier comprises connected successively triangle wave generating circuit, comparator, switch amplifying circuit and low pass filter.Those skilled in the art all know the operation principle of triangular wave power amplifier, are not described in detail in this.
Shown in Fig. 2, the utility model, by improving triangle wave generating circuit, makes triangle wave generating circuit have the feature that changes frequency with input signal, thereby makes triangular wave power amplifier have the feature of adjustable frequency.
Specifically, triangle wave generating circuit comprises: for the power input of input ac power Uin; The phase-shift circuit that connects power input, this phase-shift circuit comprises and all connects power input the first inductance L 1 and the second inductance L 2, is connected to the first resistance R 1 between the first inductance L 1 and ground and is connected to the second resistance R 2 between the second inductance L 2 and ground; Be connected to the first zero-crossing comparator U11 and the second zero-crossing comparator U12 at phase-shift circuit two ends, the normal phase input end of the first zero-crossing comparator U11 connects power input by resistance R 8, the negative-phase input of the first zero-crossing comparator U11 is by resistance R 9 ground connection, the normal phase input end of the second zero-crossing comparator U12 is connected to the common port of the first inductance L 1 and the first resistance R 1 by resistance R 3, the negative-phase input of the second zero-crossing comparator U12 is by resistance R 4 ground connection; The output of the output of the first zero-crossing comparator U11 and the second zero-crossing comparator U12 connects respectively two inputs of NAND gate U21, and the output of NAND gate U21 connects the base stage of transistor Q1 by resistance R 19, between the collector electrode of transistor Q1 and emitter, be connected capacitor C 1, the voltage-stabiliser tube DZ1 that is connected in parallel at the two ends of capacitor C 1, the negative electrode of this voltage-stabiliser tube DZ1 is connected with+12V power supply by resistance R 22.
By the first zero-crossing comparator U11 and the second zero-crossing comparator U12, export respectively square-wave signal, two square-wave signals as driving signal, are controlled transistor Q1 and capacitor C 1 is discharged and recharged and are produced warbled triangular wave after NAND gate U21 processes.The high-frequency square-wave signal of the output output of NAND gate U21 is controlled transistor Q1 and is opened and turn-off through resistance R 19, when the high level of square-wave signal arrives, transistor 1 conducting, capacitor C 1 repid discharge, until the low level of square-wave signal arrives, now transistor Q1 cut-off, + 12V power supply charges through 22 pairs of capacitor C 1 of resistance R, the amplitude size of charging voltage is relevant with the frequency of square-wave signal, frequency more amplitude is less, frequency is less and amplitude is larger, because there is the existence of voltage-stabiliser tube DZ1, so the maximum amplitude of charging voltage that can control capacitance C1.
To sum up, the utility model is by improving triangle wave generating circuit, makes the frequency of triangular wave power amplifier can be with the frequency change of input ac power, thereby is convenient to adjust power output.The utility model comes control capacitance to discharge and recharge to produce triangular wave by producing square-wave signal driving transistors conduction and cut-off, disturbs littlely and convenient and practical, can be applied in multiple occasion.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (3)
1. the triangular wave power amplifier that frequency is adjustable, comprise connected successively triangle wave generating circuit, comparator, switch amplifying circuit and low pass filter, it is characterized in that, triangle wave generating circuit comprises: connect power input the first inductance and the second inductance, be connected to the first resistance between the first inductance and ground and be connected to the second resistance between the second inductance and ground, normal phase input end couples the first zero-crossing comparator of power input, normal phase input end is coupled in the second zero-crossing comparator of the first inductance and the first resistance common port, the output of the output of the first zero-crossing comparator and the second zero-crossing comparator connects respectively the input of NAND gate, and the output of NAND gate couples transistorized base stage, between transistorized collector electrode and emitter, be connected electric capacity and with the voltage-stabiliser tube of Capacitance parallel connection, and connect external power source after a resistance of the negative electrode of voltage-stabiliser tube serial connection.
2. the triangular wave power amplifier adjustable according to frequency described in right 1, is characterized in that, the negative-phase input of the first zero-crossing comparator is by resistance R 9 ground connection, and the negative-phase input of the second zero-crossing comparator is by resistance R 4 ground connection.
3. the triangular wave power amplifier adjustable according to frequency described in right 1, is characterized in that, transistor is N-type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320709258.XU CN203537328U (en) | 2013-11-12 | 2013-11-12 | Frequency-adjustable triangular wave power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320709258.XU CN203537328U (en) | 2013-11-12 | 2013-11-12 | Frequency-adjustable triangular wave power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203537328U true CN203537328U (en) | 2014-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320709258.XU Expired - Fee Related CN203537328U (en) | 2013-11-12 | 2013-11-12 | Frequency-adjustable triangular wave power amplifier |
Country Status (1)
| Country | Link |
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| CN (1) | CN203537328U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107743027A (en) * | 2017-10-10 | 2018-02-27 | 杭州百隆电子有限公司 | A kind of triangular wave wave generator circuit |
-
2013
- 2013-11-12 CN CN201320709258.XU patent/CN203537328U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107743027A (en) * | 2017-10-10 | 2018-02-27 | 杭州百隆电子有限公司 | A kind of triangular wave wave generator circuit |
| CN107743027B (en) * | 2017-10-10 | 2023-12-22 | 杭州百隆电子有限公司 | Triangular wave waveform generation circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20141112 |
|
| EXPY | Termination of patent right or utility model |