CN115347786A - Power circuit for audio equivalent large-capacity capacitor - Google Patents
Power circuit for audio equivalent large-capacity capacitor Download PDFInfo
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- CN115347786A CN115347786A CN202210819922.XA CN202210819922A CN115347786A CN 115347786 A CN115347786 A CN 115347786A CN 202210819922 A CN202210819922 A CN 202210819922A CN 115347786 A CN115347786 A CN 115347786A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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Abstract
The invention discloses a power supply circuit for an audio equivalent large-capacity capacitor, which comprises a power supply input end, a current limiting circuit, an adjusting circuit, a constant current circuit, an active filter circuit, an error comparison amplifying circuit, a voltage reference circuit, a sampling circuit, a shunt voltage stabilizing circuit and a current output end. According to the invention, the MOS tube and the load are connected in parallel and are in a conducting state for a long time, so that the extremely low dynamic internal resistance can be realized, which is more than 100 times lower than that of the conventional stabilized voltage supply, and the invention is very suitable for the music signal processing field with large dynamic and severe current fluctuation.
Description
Technical Field
The invention belongs to the technical field of power supply circuits, and particularly relates to a power supply circuit for an audio equivalent large-capacity capacitor.
Background
Based on the wide frequency range of audio frequency (20 Hz-20 KHz with the highest frequency being 1000 times of the lowest frequency) and the high dynamics of music (> 120 db), the power supply is difficult to deal with the heavy current in the full frequency range without mutual interference between the frequencies, and the actual test shows that various audio power supplies have the same phenomenon: the lower the frequency, the higher the internal resistance of the power supply, the smaller the transient current which can be provided by the amplifying circuit, the caused phenomenon is bass collapse (loose, not firm, no texture and no diving), and the sound field of the sound becomes narrow; the audio capacitor is an important means for tuning sound of various manufacturers in the sound industry because the audio capacitor with large professional capacity can provide sufficient transient large current and extremely low-frequency dynamic internal resistance in an ultra-low frequency band (less than 100 Hz). The portable (mobile) audio frequency device has the defects of insufficient low-frequency submergence, poor sound, no air force and poor sound field of all portable (mobile) products due to the fact that a large-capacity capacitor is expensive, large in size and cannot be plugged into the portable (mobile) audio frequency product with limited size and narrow space.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a power circuit for an audio equivalent large-capacity capacitor.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a power supply circuit for an audio equivalent large-capacity capacitor, which comprises a power supply input end, a current limiting circuit, an adjusting circuit, a constant current circuit, an active filter circuit, an error comparison amplifying circuit, a voltage reference circuit, a sampling circuit, a shunt voltage stabilizing circuit and a current output end, wherein the power supply input end is connected with the current limiting circuit, the current limiting circuit sets a limited current according to the actual maximum current of the circuit, the current is output to the shunt voltage stabilizing circuit through the adjusting circuit, the sampling circuit acquires the sampling voltage of the current output end and simultaneously transmits the error comparison amplifying circuit to the voltage reference circuit for comparison, the compared error voltage is output to the shunt voltage stabilizing circuit for correcting the voltage output to form voltage stabilization, and the constant current circuit and the active filter circuit are connected to the adjusting circuit.
Preferably, the current limiting circuit includes a first resistor and a first triode, a first end of the first resistor is connected to the power input terminal and an emitter of the first triode, respectively, and a second end of the first resistor is connected to a base of the first triode.
Preferably, the adjusting circuit includes a second triode, an emitter of the second triode is connected to a base of the first triode, and a base of the second triode is connected to a collector of the first triode.
Preferably, the constant current circuit includes a second resistor and a first constant current source, a first end of the second resistor is connected to a collector of the first triode and a base of the second triode, a second end of the second resistor is connected to a first end of the first constant current source, and a second end of the first constant current source is connected to a second end of the first capacitor.
In the present invention, preferably, the active filter circuit includes a second capacitor and a second constant current source, and a first end of the second capacitor is connected to a first end of the first constant current source and a first end of the second constant current source, respectively.
Preferably, the error comparing and amplifying circuit includes a fourth resistor and a third constant current source, a first end of the third constant current source is connected to the collector of the second transistor, and a second end of the third constant current source is connected to the first end of the fourth resistor.
Preferably, the sampling circuit includes a diode and a third triode, a negative electrode of the diode is connected with a collector of the second triode, a positive electrode of the diode is connected with a base of the first triode, and a collector of the third triode is connected with the second end of the third constant current source after being connected with the voltage reference circuit in series.
Preferably, the voltage reference circuit includes a fifth resistor, a first end of the fifth resistor is connected to the anode of the diode, and a second end of the fifth resistor is connected to the base of the third transistor.
Preferably, the shunt voltage stabilizing circuit comprises an MOS transistor and a fourth constant current source, a gate of the MOS transistor is connected to the second end of the fourth resistor, a drain of the MOS transistor is connected to a collector of the second triode, a cathode of the diode, a first end of the third constant current source, a first end of the fourth constant current source, and the current output end, respectively, and a source of the MOS transistor is connected to an emitter of the third triode and the second end of the fourth constant current source, respectively.
Compared with the prior art, the invention can realize extremely low dynamic internal resistance which is more than 100 times lower than that of the conventional stabilized voltage supply by connecting the MOS tube and the load in parallel and keeping the MOS tube and the load in a conducting state for a long time, and is very suitable for the field of music signal processing with large dynamic and violent current fluctuation.
Drawings
Fig. 1 is a schematic structural diagram of a power circuit for an audio equivalent large-capacity capacitor according to an embodiment of the present invention;
FIG. 2 is a PSRR (ripple rejection ratio) graph for a frequency range of 10Hz-100KHz in accordance with an embodiment of the present invention;
FIG. 3 is a graph of the dynamic output impedance for the frequency range of 10Hz-100KHz in accordance with an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of implementations of the invention and do not limit the invention.
The invention provides a power supply circuit for an audio equivalent large-capacity capacitor, which comprises a power supply input end, a current limiting circuit, an adjusting circuit, a constant current circuit, an active filter circuit, an error comparison amplifying circuit, a voltage reference circuit, a sampling circuit, a shunt voltage stabilizing circuit and a current output end, wherein the power supply input end is connected with the current limiting circuit, the current limiting circuit sets a limited current according to the actual maximum current of the circuit, the current is output to the shunt voltage stabilizing circuit through the adjusting circuit, the sampling circuit acquires the sampling voltage of the current output end and simultaneously transmits the error comparison amplifying circuit to be compared with the voltage reference circuit, the compared error voltage is output to the shunt voltage stabilizing circuit to correct the voltage output to form voltage stabilization, and the constant current circuit and the active filter circuit are connected to the adjusting circuit.
The current limiting circuit comprises a first resistor R1 and a first triode Q1, wherein the first end of the first resistor R1 is connected with a power input end VIN and an emitting electrode of the first triode Q1 respectively, the second end of the first resistor R1 is connected with a base electrode of the first triode Q1, and the first end of the first resistor R1 is connected with a first capacitor C1 for filtering.
The adjusting circuit comprises a second triode Q2, an emitting electrode of the second triode Q2 is connected with a base electrode of the first triode Q1, and a base electrode of the second triode Q2 is connected with a collector electrode of the first triode Q1.
The constant current circuit comprises a second resistor R2 and a first constant current source I1, wherein the first end of the second resistor R2 is respectively connected with the collector electrode of the first triode Q1 and the base electrode of the second triode Q2, the second end of the second resistor R2 is connected with the first end of the first constant current source I1, and the second end of the first constant current source I1 is connected with the second end of the first capacitor C1.
The active filter circuit comprises a second capacitor C2 and a second constant current source I2, wherein the first end of the second capacitor C2 is respectively connected with the first end of the first constant current source I1 and the first end of the second constant current source I2.
The error comparison amplifying circuit comprises a fourth resistor R4 and a third constant current source I3, wherein a first end of the third constant current source I3 is connected with a collector of the second triode Q2, and a second end of the third constant current source I3 is connected with a first end of the fourth resistor R4.
The sampling circuit comprises a diode D1 and a third triode Q3, the negative electrode of the diode D1 is connected with the collector electrode of the second triode Q2, the positive electrode of the diode D1 is connected with the base electrode of the first triode Q1, and the collector electrode of the third triode Q3 is connected with the second end of a third constant current source I3 after being connected with a voltage reference circuit in series.
The voltage reference circuit comprises a fifth resistor R5, a first end of the fifth resistor R5 is connected with the anode of the diode D1, and a second end of the fifth resistor R5 is connected with the base of the third triode Q3.
The shunt voltage stabilizing circuit comprises an MOS tube Q4 and a fourth constant current source I4, the grid electrode of the MOS tube Q4 is connected with the second end of a fourth resistor R4, the drain electrode of the MOS tube Q4 is respectively connected with the collector electrode of a second triode Q2, the negative electrode of a diode D1, the first end of a third constant current source I3, the first end of the fourth constant current source I4 and the current output end VOUT, and the source electrode of the MOS tube Q4 is respectively connected with the emitter electrode of the third triode Q3 and the second end of the fourth constant current source I4.
In the scheme, the method comprises the following steps:
the first triode Q1 and the first resistor R1 form a current limiting circuit, the resistance value of the first resistor R1 sets the current of the circuit, a constant current source is shunted from the power input end VIN to the MOS tube Q4 through the second triode Q2 and is output to a load, the circuit is converted from a high-output-impedance current source to a low-output-impedance voltage source, and excess current is shunted through the MOS tube Q4, so that the MOS tube Q4 is a part of a feedback loop, the diode D1 and the Vbe of the third triode Q3 form a sampling circuit, any voltage exceeding the diode D1 is conducted and level shifted and then converted to the third triode Q3 to form a correction current, and the comparison error current charges/discharges the control grid of the second triode Q2 so as to correct the required output voltage. The first constant current source I1, the second constant current source I2 and the third constant current source I3 are low-noise constant current sources and provide bias current sources for the triodes, and the noise coefficient of the constant current sources is a key device of the PSRR parameter of the power supply. The second constant current source I2 and the second capacitor C2 constitute an active filter circuit, and the parameters of the second capacitor C2 determine the lower limit frequency of the low frequency, PSRR, and the low frequency internal resistance.
Because the MOS tube Q4 is in a long-term conduction state, the maximum current with the conduction current larger than the load is set to form a parallel connection relation with the load, the conduction internal resistance of the Rds is very low according to the conduction characteristic of the MOS tube Q4, and the voltage drop generated by any current fluctuation on the load is consumed by the ultra-low internal resistance; the MOS transistor Q4 has wide frequency characteristics, completely covers the audio frequency range of 20-20KHz, and therefore can provide enough low internal resistance and ultrahigh PSRR in the whole audio frequency range.
The invention is suitable for power supply circuits with low current, such as small signal amplification, preceding stage amplification, operational amplification, earphone amplifier and the like; the ultra-high ripple rejection ratio (10-20KHz PSRR 182db) is shown in figure 2, the output ripple is as low as 0.3uV, and the music background is dark and quiet; the dynamic internal resistance (< 0.4m omega) of the whole audio frequency range is shown in fig. 3, which is sufficient transient current at any audio frequency point, and the fluctuation (voltage drop) generated at each frequency point is lowest because of the extremely low dynamic internal resistance, the crosstalk between frequencies (frequency spectrums) is also reduced to be lowest, the power circuit has excellent control force, and shows that bass is mellow, natural and has texture, low, medium and high frequency layers are clear, a sound field is wide, positioning is accurate, sound dyeing is minimum, and actual subjective auditory sensation shows reality, nature and hearing resistance.
The invention has the characteristics of low noise, good transient response, wide frequency range, dynamic internal resistance and the like, can completely equal or exceed the performance of a large-capacity audio capacitor in a sound box, is very suitable for a narrow physical space of a portable (mobile) product, and lays a foundation for the portable (mobile) product to have high-quality sound.
In conclusion, the MOS tube and the load are connected in parallel and are in a conducting state for a long time, so that the extremely low dynamic internal resistance can be realized, the dynamic internal resistance is more than 100 times lower than that of a conventional stabilized voltage power supply, and the high-power constant-voltage power supply is very suitable for the field of music signal processing with large dynamic and severe current fluctuation.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, the terms describing the positional relationships in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but also other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a" \8230; "does not exclude the presence of additional like elements in a process, article, or apparatus that comprises the element.
The above description is only an example of the frame of the present invention, and is not intended to limit the scope of the present invention.
Claims (9)
1. A power supply circuit for an audio equivalent large-capacity capacitor is characterized by comprising a power supply input end, a current limiting circuit, an adjusting circuit, a constant current circuit, an active filter circuit, an error comparison amplifying circuit, a voltage reference circuit, a sampling circuit, a shunt voltage stabilizing circuit and a current output end, wherein the power supply input end is connected with the current limiting circuit, the current limiting circuit sets a limited current according to the actual maximum current of the circuit, the current is output to the shunt voltage stabilizing circuit through the adjusting circuit, the sampling circuit acquires the sampling voltage of the current output end and simultaneously transmits the error comparison amplifying circuit to be compared with the voltage reference circuit, the compared error voltage is output to the shunt voltage stabilizing circuit to correct the voltage output to form voltage stabilization, and the constant current circuit and the active filter circuit are connected to the adjusting circuit.
2. A power supply circuit for an audio equivalent large capacity capacitor as claimed in claim 1, wherein said current limiting circuit comprises a first resistor and a first triode, a first end of said first resistor is connected to the power input terminal and the emitter of the first triode respectively, and a second end of said first resistor is connected to the base of the first triode.
3. A power supply circuit for an audio equivalent large capacity capacitor as claimed in claim 2, wherein said adjusting circuit comprises a second transistor, an emitter of said second transistor is connected to a base of said first transistor, and a base of said second transistor is connected to a collector of said first transistor.
4. A power supply circuit for an audio equivalent large capacity capacitor according to claim 3, wherein said constant current circuit comprises a second resistor and a first constant current source, a first end of said second resistor is connected to the collector of the first triode and the base of the second triode respectively, a second end of said second resistor is connected to a first end of the first constant current source, and a second end of said first constant current source is connected to a second end of the first capacitor.
5. The power supply circuit for an audio-frequency equivalent large capacity capacitor as claimed in claim 4, wherein said active filter circuit comprises a second capacitor and a second constant current source, and a first end of said second capacitor is connected to a first end of the first constant current source and a first end of the second constant current source, respectively.
6. The power supply circuit for an audio-frequency equivalent large-capacity capacitor as claimed in claim 5, wherein said error comparing and amplifying circuit includes a fourth resistor and a third constant current source, a first terminal of said third constant current source is connected to the collector of the second transistor, and a second terminal of said third constant current source is connected to a first terminal of the fourth resistor.
7. A power supply circuit for an audio-frequency equivalent large capacity capacitor as claimed in claim 6, characterized in that, said sampling circuit includes a diode and a third triode, the cathode of said diode is connected with the collector of the second triode, the anode of said diode is connected with the base of the first triode, the collector of said third triode is connected with the second end of the third constant current source after being connected with the voltage reference circuit in series.
8. The power circuit for an audio equivalent large capacity capacitor according to claim 7, wherein said voltage reference circuit comprises a fifth resistor, a first end of said fifth resistor is connected to an anode of a diode, and a second end of said fifth resistor is connected to a base of a third triode.
9. The power supply circuit for an audio equivalent large capacity capacitor according to claim 8, wherein said shunt voltage regulator circuit comprises a MOS transistor and a fourth constant current source, a gate of said MOS transistor is connected to a second terminal of a fourth resistor, a drain of said MOS transistor is connected to a collector of the second transistor, a cathode of the diode, a first terminal of the third constant current source, a first terminal of the fourth constant current source and a current output terminal, respectively, and a source of said MOS transistor is connected to an emitter of the third transistor and a second terminal of the fourth constant current source, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210819922.XA CN115347786A (en) | 2022-07-13 | 2022-07-13 | Power circuit for audio equivalent large-capacity capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210819922.XA CN115347786A (en) | 2022-07-13 | 2022-07-13 | Power circuit for audio equivalent large-capacity capacitor |
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| Publication Number | Publication Date |
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| CN115347786A true CN115347786A (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210819922.XA Pending CN115347786A (en) | 2022-07-13 | 2022-07-13 | Power circuit for audio equivalent large-capacity capacitor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116338509A (en) * | 2023-03-20 | 2023-06-27 | 武汉芯必达微电子有限公司 | Test method and test circuit for rapidly-changing power supply signal |
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2022
- 2022-07-13 CN CN202210819922.XA patent/CN115347786A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116338509A (en) * | 2023-03-20 | 2023-06-27 | 武汉芯必达微电子有限公司 | Test method and test circuit for rapidly-changing power supply signal |
| CN116338509B (en) * | 2023-03-20 | 2023-08-29 | 武汉芯必达微电子有限公司 | Test method and test circuit for rapidly-changing power supply signal |
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