CN209517071U - A kind of D-type power amplifier reducing power supply pump hidden danger - Google Patents
A kind of D-type power amplifier reducing power supply pump hidden danger Download PDFInfo
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- CN209517071U CN209517071U CN201920312933.2U CN201920312933U CN209517071U CN 209517071 U CN209517071 U CN 209517071U CN 201920312933 U CN201920312933 U CN 201920312933U CN 209517071 U CN209517071 U CN 209517071U
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- 239000004065 semiconductor Substances 0.000 claims description 23
- 239000003990 capacitor Substances 0.000 claims description 11
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- 230000009977 dual effect Effects 0.000 abstract description 3
- 230000000630 rising effect Effects 0.000 abstract description 2
- 239000010752 BS 2869 Class D Substances 0.000 description 3
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Abstract
The utility model discloses a kind of D-type power amplifiers for reducing power supply pump hidden danger, suitable for the D-type power amplifier using half-bridge dual power supply.Including first-order filtering module, inverting amplifier, second-order filter module, pulse width modulation module, power supply pump shutdown module and filter module.First-order filtering module, inverting amplifier, second-order filter module, pulse width modulation module, filter module and load are sequentially connected electrically, and power supply pump turns off module between pulse width modulation module and power supply；Pulse width modulation module includes pulsewidth generating unit, driving portion and voltage bootstrapping portion.The utility model improves the loop gain of power amplifier using second-order loop filter, reduces total harmonic distortion；It is added to power supply pump shutdown module, the influence caused by circuit when alleviating the uncontrollable rising of supply voltage.
Description
Technical field
It is especially a kind of using half-bridge dual power supply, reduction electricity the utility model relates to field electronic circuit field
The D-type power amplifier of source pump hidden danger.
Background technique
Class-D amplifier gains universal acceptance in electronic audio field, and more and more replace classical A class and
Class ab ammplifier, this is mainly due to modulating stages to have higher efficiency using switching mode, this attribute is very valuable, meaning
Taste smaller radiator volume and power supply capacity.However, in terms of mainstream HD Audio, due to non-linear, to power supply line
Wave is sensitive, and noise and relatively high etc. reasons of distortion, class-D amplifier are not fully received.Therefore, amplify to improve D class
The fidelity of device uses closed loop topology, but simple closed loop topology reduces the gain of loop.
Class-D amplifier power stage there are two types of topology: full-bridge and half-bridge.Although full-bridge topology can solve in performance
A little problem, but full-bridge needs four switching tubes, four driving circuits, and the hardware requirement of half-bridge is only the half of full-bridge.For
Save the cost and design difficulty, most of amplifier manufacturers can select half-bridge topology.Half-bridge topology is supplied using dual power supply
When electric, since signal is bipolarity, therefore can generate the electric current of reflux through the body diode of switching tube is power source charges to higher electricity
Pressure, easily damage circuit devcie.
Therefore, in conclusion it is necessary to provide high loop gain, high-performance, avoiding uncontrollable supply voltage damage circuit
D-type power amplifier.
Summary of the invention
In view of the above problems, the utility model provides a kind of D-type power amplifier for reducing power supply pump hidden danger.
The utility model discloses a kind of D-type power amplifier for reducing power supply pump hidden danger, it is suitable for using the double electricity of half-bridge
The D-type power amplifier of source power supply.Including first-order filtering module, inverting amplifier, second-order filter module, pulse width modulation module,
Power supply pump turns off module and filter module.The first-order filtering module, the inverting amplifier, the second-order filter module, institute
It states pulse width modulation module, the filter module and load to be sequentially connected electrically, the power supply pump shutdown module is located at the pulsewidth tune
Between molding block and power supply；The pulse width modulation module includes pulsewidth generating unit, driving portion and voltage bootstrapping portion.
The first-order filtering module includes the first operation amplifier circuit, and reverse inter-input-ing ending grounding, audio electrical signal is through defeated
Enter resistance connection non-inverting input terminal, the output of the pulse width modulation module connects non-inverting input terminal through first resistor, exports through two
A concatenated capacitance connection has second resistance to be connected to ground to non-inverting input terminal between two concatenated capacitors.The reverse phase is put
Big device non-inverting input terminal ground connection, inverting input terminal are connected to the output of the first-order filtering module through a resistance, and output is through the
Three resistance are connected to inverting input terminal.The second-order filter module includes second operational amplifier circuit, and non-inverting input terminal is grounded,
The output signal of the inverting amplifier is connected to inverting input terminal through the 4th resistance, and the output of the pulse width modulation module is through
Five resistance connect non-inverting input terminal, and output is through two concatenated capacitance connections to inverting input terminal, between two concatenated capacitors
There is the 6th resistance to be connected to ground, output is connected to the pulse width modulation module.
The pulse width modulation module includes that pulsewidth generating unit, driving portion and voltage bootstrapping portion, three are sequentially connected.The arteries and veins
The input of wide generating unit is output and the triangular signal of the second-order filter module, and output connects the driving portion, the drive
Dynamic portion's output connection voltage bootstrapping portion；Voltage bootstrapping portion includes two metal-oxide-semiconductors, and the first metal-oxide-semiconductor source electrode is connected to institute
Power supply pump shutdown module is stated, drain electrode is connected to the second metal-oxide-semiconductor, and the source electrode of the second metal-oxide-semiconductor is connected to negative supply, from two metal-oxide-semiconductors
Junction output.The filter module includes the inductance and capacitor for being connected in series to ground, is inputted as the defeated of the pulse width modulation module
Out, load is connected between the inductance and capacitor of the filter module.
The power supply pump shutdown module includes third metal-oxide-semiconductor, triode, comparator, the 7th resistance, the 8th resistance, the 9th
Resistance.7th resistance, the 8th resistance are connected between positive supply and ground；9th resistance be connected to positive supply with it is described
Between the grid of third metal-oxide-semiconductor；The third metal-oxide-semiconductor includes an individual diodes, and source electrode is connected to positive supply, and grid is connected to
The collector of the triode；The emitter of the triode is grounded, and base stage is connected to the output of the comparator；The comparison
The non-inverting input terminal of device is connected between the 7th resistance and the 8th resistance, and inverting input terminal is connected to reference voltage, reference
Pressure voltage of the voltage according to circuit devcie and the demand to power amplifier are any given.
A kind of D-type power amplifier reducing power supply pump hidden danger described in the utility model, using second-order loop filter
The loop gain of power amplifier is improved, total harmonic distortion is reduced；It is added to power supply pump shutdown module, when on supply voltage
When being raised to preset value, shutdown power supply, so that circuit element is not damaged, to electricity when alleviating the uncontrollable rising of supply voltage
It is influenced caused by road.
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 circuit diagram of D-type power amplifier for reducing power supply pump hidden danger described in the utility model.
It is numbered in figure:
10: first-order filtering module；20: inverting amplifier；30: second-order filter module；
40: pulse width modulation module；401: pulsewidth generating unit；402: driving portion；
50: power supply pump turns off module；60: filter 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, former for a kind of circuit for the D-type power amplifier for reducing power supply pump hidden danger described in the utility model
Reason figure.It includes first-order filtering module 10, inverting amplifier 20, second-order filter module 30, pulse width modulation module 40, power supply pump pass
Disconnected module 50 and filter module 60.First-order filtering module 10 includes the first operation amplifier circuit A1, reverse inter-input-ing ending grounding, sound
Frequency electric signal is through input resistance R1 connection non-inverting input terminal, and the output of pulse width modulation module 40 is through first resistor R2 connection with mutually defeated
Enter end, output is connected to non-inverting input terminal through two concatenated capacitor C1, C2, has second resistance R3 to be connected to ground between C1, C2.
Inverting amplifier A2 non-inverting input terminal ground connection, inverting input terminal are connected to the defeated of the first-order filtering module through a resistance R4
Out, output is connected to inverting input terminal through 3rd resistor R5.Second-order filter module includes second operational amplifier circuit A3, same to phase
The output signal of input end grounding, inverting amplifier A2 is connected to inverting input terminal, pulse width modulation module 40 through the 4th resistance R6
Output through the 5th resistance R7 connection non-inverting input terminal, output is connected to inverting input terminal through two concatenated capacitor C3, C4,
There is the 6th resistance R8 to be connected to ground between C3, C4, output is connected to pulse width modulation module 40.Pulse width modulation module includes pulsewidth hair
Life portion 401, driving portion 402 and voltage bootstrapping portion M1, M2；The input of pulsewidth generating unit 401 is the output of second-order filter module 30
With triangular signal, output connection driving portion 402, the output of driving portion 402 connects voltage bootstrapping portion M1, M2；Voltage bootstrapping portion
Including two metal-oxide-semiconductors M1, M2, the first metal-oxide-semiconductor M1 source electrode is connected to power supply pump shutdown module 50, and drain electrode is connected to the second metal-oxide-semiconductor
The source electrode of M2, the second metal-oxide-semiconductor M2 are connected to negative supply, export between M1, M2.Filter module 60 includes the inductance for being connected in series to ground
L1 and capacitor C5 inputs as the output of pulse width modulation module 40, and load is connected between L1 and C5.Power supply pump turns off module 50 and wraps
Include third metal-oxide-semiconductor M3, triode Q1, comparator A4, the 7th resistance R9, the 8th resistance R10, the 9th resistance R11；R9, R10 series connection
Between positive supply and ground；R11 is connected between positive supply and the grid of third metal-oxide-semiconductor M3；Third metal-oxide-semiconductor M3 includes an individual
Diode, source electrode are connected to positive supply, and grid is connected to the collector of triode Q1；The emitter of Q1 is grounded, and base stage is connected to
The output of comparator A4；The non-inverting input terminal of comparator A4 is connected between R9, R10, and inverting input terminal is connected to reference voltage.
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 D-type power amplifier for reducing power supply pump hidden danger, which is characterized in that amplify including first-order filtering module, reverse phase
Device, second-order filter module, pulse width modulation module, power supply pump shutdown module and filter module；
The first-order filtering module includes the first operation amplifier circuit, and reverse inter-input-ing ending grounding, audio electrical signal is through input electricity
The output of resistance connection non-inverting input terminal, the pulse width modulation module connects non-inverting input terminal through first resistor, and output is gone here and there through two
The capacitance connection of connection has second resistance to be connected to ground to non-inverting input terminal between two concatenated capacitors；
The inverting amplifier non-inverting input terminal ground connection, inverting input terminal are connected to the first-order filtering module through a resistance
Output, output are connected to inverting input terminal through 3rd resistor；
The second-order filter module includes second operational amplifier circuit, non-inverting input terminal ground connection, the inverting amplifier it is defeated
Signal is connected to inverting input terminal through the 4th resistance out, and the output of the pulse width modulation module connects homophase input through the 5th resistance
End, output have the 6th resistance to be connected to ground through two concatenated capacitance connections to inverting input terminal between two concatenated capacitors,
Output is connected to the pulse width modulation module；
The pulse width modulation module includes that pulsewidth generating unit, driving portion and voltage bootstrapping portion, three are sequentially connected；The pulsewidth hair
The input in life portion is output and the triangular signal of the second-order filter module, and output connects the driving portion, the driving portion
Output connection voltage bootstrapping portion；Voltage bootstrapping portion includes two metal-oxide-semiconductors, and the first metal-oxide-semiconductor source electrode is connected to the electricity
Source pump shutdown module, drain electrode are connected to the second metal-oxide-semiconductor, and the source electrode of the second metal-oxide-semiconductor is connected to negative supply, from the company of two metal-oxide-semiconductors
Connect place's output；The filter module includes the inductance and capacitor for being connected in series to ground, inputs as the output of the pulse width modulation module, bears
Load is connected between the inductance and capacitor of the filter module；
The power supply pump shutdown module includes third metal-oxide-semiconductor, triode, comparator, the 7th resistance, the 8th resistance, the 9th resistance；
7th resistance, the 8th resistance are connected between positive supply and ground；9th resistance is connected to positive supply and the third
Between the grid of metal-oxide-semiconductor；The third metal-oxide-semiconductor includes an individual diodes, and source electrode is connected to positive supply, and grid is connected to described
The collector of triode；The emitter of the triode is grounded, and base stage is connected to the output of the comparator；The comparator
Non-inverting input terminal is connected between the 7th resistance and the 8th resistance, and inverting input terminal is connected to reference voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920312933.2U CN209517071U (en) | 2019-03-13 | 2019-03-13 | A kind of D-type power amplifier reducing power supply pump hidden danger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920312933.2U CN209517071U (en) | 2019-03-13 | 2019-03-13 | A kind of D-type power amplifier reducing power supply pump hidden danger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209517071U true CN209517071U (en) | 2019-10-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920312933.2U Expired - Fee Related CN209517071U (en) | 2019-03-13 | 2019-03-13 | A kind of D-type power amplifier reducing power supply pump hidden danger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209517071U (en) |
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2019
- 2019-03-13 CN CN201920312933.2U patent/CN209517071U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191018 |
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| CF01 | Termination of patent right due to non-payment of annual fee |