CN208623633U - A kind of frequency multiplication jump pulse protective device suitable for PWM power amplifier - Google Patents
A kind of frequency multiplication jump pulse protective device suitable for PWM power amplifier Download PDFInfo
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- CN208623633U CN208623633U CN201821460655.7U CN201821460655U CN208623633U CN 208623633 U CN208623633 U CN 208623633U CN 201821460655 U CN201821460655 U CN 201821460655U CN 208623633 U CN208623633 U CN 208623633U
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- power amplifier
- jump pulse
- pwm
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- 230000001681 protective effect Effects 0.000 title claims abstract description 12
- 230000010354 integration Effects 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001960 triggered effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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Abstract
The utility model discloses a kind of frequency multiplication jump pulse protective devices suitable for PWM power amplifier comprising protection signal receiving module, control module, power amplifier module, times frequency module and jump pulse module are mainly used in the power amplifier of pulsewidth modulation (PWM).It protects signal receiving module to receive the recoverable protection signal that power amplifier module generates, and is a control signal by protection signal integration, be sent to control module.Control module receives control signal, whether connects times frequency module and jump pulse module according to control signal deciding.Times frequency module is used to the carrier frequency of PWM in power amplifier module improving n times.Jump pulse module for skipping m period in PWM wave every n period that power amplifier module exports, and m is less than n.The utility model jump pulse while improving carrier frequency is small to the distortion effect of power amplifier module；Output power is reduced by way of jump pulse, so that power amplifier module remains to continue working when triggering can restore protection, and restores to work normally.
Description
Technical field
The utility model relates to a kind of protective device of electronic technology field, especially a kind of times suitable for PWM power amplifier
Chatter pulse protective device.
Background technique
For power amplifier since its amplifying effect is good, raising sound quality ability is strong, is widely used in home entertaining, business performance, meeting
It amplifies etc. in the audio-video system of occasions, as equipment most basic in sound system, its task is to from the micro- of signal source
Weak electric signal is amplified to be made a sound with drive the speaker.In various power amplifier type D class power amplifier due to efficiency distortion,
The advantages that frequency response curve is good, gradually instead of traditional A, B class power amplifier.D class power amplifier is a kind of will to input analogue audio frequency
Signal or PCM digital information be transformed into PWM(pulse width modulation) or PDM(pulse density modulated) pulse signal, then use
The pulse signal of PWM or PDM removes control high-power switch device on-off audio-frequency power amplifier.
In order to guarantee that power amplifier is hardly damaged, it will usually be equipped with a variety of protected modes, such as: overload protection, overcurrent protection, overheat
Protection etc..When above-mentioned protection starts, power amplifier will be turned off, and stop working, and seriously affect the use feeling of power amplifier.
Therefore, it is necessary to which providing a kind of device can still continue working when power amplifier issues protection signal.
Summary of the invention
In view of the above problems, the utility model provides a kind of frequency multiplication jump pulse protective device suitable for PWM power amplifier.
The utility model discloses a kind of frequency multiplication jump pulse protective devices suitable for PWM power amplifier comprising protection signal
Receiving module, control module, power amplifier module, times frequency module and jump pulse module are mainly used in using pulsewidth modulation (PWM)
Power amplifier.The protection signal receiving module receives the recoverable protection signal that the power amplifier module generates, and by above-mentioned protection
Signal integration is a control signal, is sent to the control module.The control module receives control signal, is believed according to control
Number decide whether to act on times frequency module and the jump pulse module.Described times of frequency module is by PWM in the power amplifier module
Carrier frequency improve n times.The PWM wave exported in the power amplifier module every n period is skipped m week by the jump pulse module
Phase, and m is less than n.
The protection signal receiving module receives the recoverable protection signal that the power amplifier module generates, and by above-mentioned guarantor
Shield signal integration is a control signal, is sent to the control module.
The control module receives the control signal sent by the protection signal receiving module, when control signal display is protected
When shield is not triggered, as shown in Figure 1, carrier signal is directly entered PWM, without described times of frequency module, PWM output signal is direct
Ingoing power grade, without the jump pulse module；When control signal display protection is triggered, the control module connects institute
Times frequency module and the jump pulse module are stated, carrier signal enters PWM after described times of frequency module, and PWM output signal is passed through
Enter power stage after the jump pulse module.
Described times of frequency module is used to the carrier frequency of PWM in the power amplifier module improving n times, and wherein n can be according to demand
It is configured and adjusts with circuit design.
The jump pulse module is used to skip m for the PWM wave exported in the power amplifier module every n, and wherein n is according to institute
Depending on stating the multiple n that carrier frequency improves in times frequency module, it can receive in range to control distortion, m is less than n.
The utility model the power amplifier module restore protection be triggered when, reduced by way of jump pulse defeated
Power out, so that power amplifier module remains to continue working when triggering can restore protection.And the utility model is improving carrier frequency
Jump pulse while rate, it is small to the distortion effect of the power amplifier module, compared to the prior art, mentioned for the preferable use feeling of power amplifier
It has supplied to guarantee.For certain power amplifiers, the condition being triggered is protected no longer to meet after reducing power, therefore power amplifier is able to restore normal
Working condition, the result is different because of power amplifier, therefore does this explanation.
In order to which the above content of the utility model can be clearer and more comprehensible, preferred embodiment is cited below particularly, and appended by cooperation
Schema is described in detail below.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is a kind of functional module signal of frequency multiplication jump pulse protective device suitable for PWM power amplifier of the utility model
Figure；
Fig. 2 is bipolarity PWM carrier wave and PWM output waveform before protection triggers；
Fig. 3 is described times frequency module and the jump of the waveform by the utility model shown in Fig. 3 after can restoring protection triggering
Carrier waveform and PWM output waveform figure after pulse module；
Fig. 4 is the circuit diagram of the utility model carrier generating circuit and described times of frequency module.
It is numbered in figure:
10: the frequency multiplication jump pulse protective device suitable for PWM power amplifier
101: the protection signal receiving module
102: the control module
103: the power amplifier module
104,204: described times frequency modules
105: the jump pulse module.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.Therefore, below to attached
The detailed description of the embodiments of the present invention provided in figure is not intended to limit the range of claimed invention,
But it is merely representative of the selected embodiment of the utility model.
Referring to Fig. 1, a kind of function mould of frequency multiplication jump pulse protective device suitable for PWM power amplifier for the utility model
Block schematic diagram.A kind of frequency multiplication jump pulse protective device 10 suitable for PWM power amplifier of the utility model comprising protection signal connects
Receive module 101, control module 102, power amplifier module 103, times frequency module 104 and jump pulse module 105.Protect signal receiving module
101 receive the recoverable protection signal that power amplifier module 103 generates, and are a control signal by above-mentioned protection signal integration,
It is sent to control module 102.After control module 102 receives control signal, whether frequency multiplication is acted on according to control signal deciding
Module 104 and jump pulse module 105.When control signal show can restore protect be not triggered when, carrier signal directly into
Enter PWM, without frequency module 104 again, PWM output signal is directly entered power stage, without jump pulse module 105；Work as control
Signal shows that at least one can restore protection when being triggered, and control module 102 connects times frequency module 104 and jump pulse module 105,
Carrier signal enters PWM after frequency module 104 again, and PWM output signal enters power stage after jump pulse module 105.
Fig. 2 and Fig. 3 are please referred to, the carrier wave for the front and back that is triggered for the utility model in protection and the waveform diagram of PWM output.Function
When putting normal work, as shown in Fig. 2, after protection is triggered, control module shown in Fig. 1 is led simultaneously for carrier wave and PWM output waveform
Logical times frequency module and jump pulse module, obtain waveform diagram shown in Fig. 3.Times frequency module makes carrier frequency become original 2 times, jumps
The pulse module every two period skips a cycle, and the number of pulse is constant, but width reduces half.Only due to the present embodiment
Play signal, therefore wave distortion is more apparent after jump pulse as shown in Figure 3, but in the application of practical power amplifier, carrier frequency is usual
For 200KHz or more, it is much larger than audio signal frequency, therefore actual distortion is small.
Referring to Fig. 4, the circuit for carrier signal the generation circuit and times frequency module of the power amplifier module of the utility model shows
It is intended to.When normal work, switch S1 connects the R3 that resistance value is 100K Ω, and carrier frequency is 200KHz at this time.When protection is triggered
When, it is published originally that control module, which generates the R3 that control signal makes switch S1 connect resistance value 5K Ω, and carrier frequency is 400KHz at this time
Twice of wave frequency rate.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are also included in the patent protection scope of the utility model.
Claims (1)
1. a kind of frequency multiplication jump pulse protective device suitable for PWM power amplifier, which is characterized in that including protection signal receiving module,
Control module, power amplifier module, times frequency module and jump pulse module；The protection signal receiving module receives the power amplifier module and produces
Raw recoverable protection signal integration is a control signal, is sent to the control module；The control module receives control
Whether signal processed acts on times frequency module and the jump pulse module according to control signal deciding；Described times of frequency module will
The carrier frequency of PWM improves n times in the power amplifier module；The PWM wave that the jump pulse module will export in the power amplifier module
Every n period skips m period, and m is less than n.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821460655.7U CN208623633U (en) | 2018-09-07 | 2018-09-07 | A kind of frequency multiplication jump pulse protective device suitable for PWM power amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821460655.7U CN208623633U (en) | 2018-09-07 | 2018-09-07 | A kind of frequency multiplication jump pulse protective device suitable for PWM power amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208623633U true CN208623633U (en) | 2019-03-19 |
Family
ID=65717186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821460655.7U Expired - Fee Related CN208623633U (en) | 2018-09-07 | 2018-09-07 | A kind of frequency multiplication jump pulse protective device suitable for PWM power amplifier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208623633U (en) |
-
2018
- 2018-09-07 CN CN201821460655.7U patent/CN208623633U/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 |
Granted publication date: 20190319 |
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| CF01 | Termination of patent right due to non-payment of annual fee |