CN113630688A - Direct current servo circuit - Google Patents
Direct current servo circuit Download PDFInfo
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- CN113630688A CN113630688A CN202110898524.7A CN202110898524A CN113630688A CN 113630688 A CN113630688 A CN 113630688A CN 202110898524 A CN202110898524 A CN 202110898524A CN 113630688 A CN113630688 A CN 113630688A
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- direct current
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- 230000008878 coupling Effects 0.000 claims abstract description 40
- 238000010168 coupling process Methods 0.000 claims abstract description 40
- 238000005859 coupling reaction Methods 0.000 claims abstract description 40
- 230000004044 response Effects 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 40
- 230000006978 adaptation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
- H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
- H03F3/187—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/03—Indexing scheme relating to amplifiers the amplifier being designed for audio applications
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Multimedia (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a DC servo circuit, which comprises: a DC amplifier; the positive phase end of the direct current amplifier is electrically connected with an alternating current signal coupling network or a high-pass filter, the low-frequency response of the positive phase end of the direct current amplifier is reduced through the alternating current signal coupling network or the high-pass filter, and the alternating current signal coupling network or the high-pass filter is electrically connected with a direct current signal input end; the frequency selection network is electrically connected with the direct current amplifier, the frequency selection network and the direct current amplifier form an inverting amplifier, the low-frequency response of a negative phase end of the direct current amplifier is reduced through the frequency selection network, the alternating current signal coupling network or the high-pass filter is electrically connected with the frequency selection network, and the frequency selection network is electrically connected with a direct current signal input end; the coupling network is connected with the output end of the direct current amplifier and the direct current signal output end; the direct current offset is greatly reduced.
Description
Technical Field
The invention relates to the technical field of amplifying circuits, in particular to a direct current servo circuit.
Background
Most of the existing sound circuits are composed of differential circuits or various types of symmetrical circuits, if the output midpoint direct-current voltage of the front-stage amplifying circuit is higher, the rear-stage amplifying circuit deviates from the original symmetrical working state, and then symmetrical audio signals cannot be amplified better. That is, the circuit with the offset of the output midpoint, under the condition that obvious distortion exists, the amplified signal is the distorted signal; more seriously, if the midpoint of the output is offset by too high a dc voltage, this may cause the speaker connected to it to not function well, and in severe cases may even burn out the speaker connected to it. To reduce the dc offset voltage at the output of the amplifier, a zeroing circuit and a dc servo circuit are generally added to improve the dc offset voltage, or to completely solve the problem of the dc offset voltage at the output of the amplifier.
The existing direct current servo circuit is generally composed of a low-pass filter and an integrating circuit, and is designed to be more complex in order to be compatible with a current module and a voltage module, and a plurality of connecting wires are arranged at a plurality of positions, so that the overall volume of the circuit is larger; meanwhile, the DC offset reduction effect at the output and input ends is also relatively general.
Accordingly, there is a need for a dc servo circuit that can address one or more of the above problems.
Disclosure of Invention
To solve one or more of the problems of the prior art, the present invention provides a dc servo circuit. The technical scheme adopted by the invention for solving the problems is as follows: a dc servo circuit, comprising: the direct current amplifier is electrically connected with the positive power supply and the negative power supply;
the positive phase end of the direct current amplifier is electrically connected with an alternating current signal coupling network or a high-pass filter, the low-frequency response of the positive phase end of the direct current amplifier is reduced through the alternating current signal coupling network or the high-pass filter, and the alternating current signal coupling network or the high-pass filter is electrically connected with a direct current signal input end;
the frequency selection network is electrically connected with the direct current amplifier, the frequency selection network and the direct current amplifier form an inverting amplifier, the low-frequency response of a negative phase end of the direct current amplifier is reduced through the frequency selection network, the alternating current signal coupling network or the high-pass filter is electrically connected with the frequency selection network, and the frequency selection network is electrically connected with a direct current signal input end;
the coupling network is connected with the output end of the direct current amplifier and the direct current signal output end;
the direct current signal input end is electrically connected with the direct current signal output end, and the coupling network offsets the direct current inverted signal output by the direct current amplifier and the input direct current signal.
Further, the dc signal input terminal and the dc signal output terminal are the same terminal.
Further, the alternating current signal coupling network and the high-pass filter generate a floating negative voltage at the positive phase end of the direct current amplifier.
Further, the alternating current signal coupling network comprises a first capacitor and a first resistor; the output end of the first resistor is grounded, the input end of the first resistor is electrically connected with the positive phase end of the direct current amplifier and the output end of the first capacitor, and the input end of the first capacitor is electrically connected with the direct current signal input end.
Furthermore, the frequency-selective network comprises a second capacitor and a second resistor, the coupling network comprises a third resistor, and the direct-current signal input end and the direct-current signal output end are the same end point; the input end of the second resistor is electrically connected with the direct current signal input end, the output end of the second resistor is electrically connected with the input end of the second capacitor and the negative phase end of the direct current amplifier, the output end of the second capacitor is electrically connected with the output end of the direct current amplifier and the output end of the third resistor, and the input end of the third resistor is electrically connected with the direct current signal input end.
Further, the larger the values of the first capacitor and the first resistor are, the lower the low-frequency response of the positive phase end of the dc amplifier is.
Further, the larger the values of the second capacitor and the second resistor are, the lower the low-frequency response of the frequency-selective network is.
Further, the power supply device further comprises a third capacitor, wherein the third capacitor is a power supply decoupling capacitor and is arranged between the positive power supply and the negative power supply.
The invention has the advantages that the direct current amplifier, the alternating current signal coupling network, the frequency selection network, the coupling network and other circuits are connected together through ingenious layout, the overall volume of the direct current servo circuit is reduced, the direct current signal input end and the direct current signal output end are combined at the same end point, the direct current signal output by the amplifier and the input direct current signal are offset, the active direct current servo effect is achieved, the direct current offset of the direct current input end and the direct current output end is greatly reduced, and the circuit is low in power consumption, high in efficiency and wide in adaptation range. The practical value of the invention is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a DC servo circuit according to the present invention;
FIG. 2 is a schematic block diagram of a DC servo circuit according to the present invention.
[ reference numerals ]
101. adder/DC offset circuit input positive polarity pulsating DC signal + pulsating DC signal output by inverting DC servo circuit
201 positive phase signal, negative phase signal, frequency selective network
301. inverse DC servo circuit.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
As shown in fig. 1, the present invention discloses a dc servo circuit, which includes: a direct current Amplifier (AMP) electrically connected to a positive power supply (VCC) and a negative power supply (VEE);
the positive phase end of the direct current amplifier AMP is electrically connected with an alternating current signal coupling network or a high-pass filter, the low-frequency response of the positive phase end of the direct current amplifier AMP is reduced through the alternating current signal coupling network or the high-pass filter, and the alternating current signal coupling network or the high-pass filter is electrically connected with a direct current signal input end;
the frequency selection network is electrically connected with the direct current amplifier AMP, the frequency selection network and the direct current amplifier AMP form an inverting amplifier, the low-frequency response of a negative phase end of the direct current amplifier AMP is reduced through the frequency selection network, the alternating current signal coupling network or the high-pass filter is electrically connected with the frequency selection network, and the frequency selection network is electrically connected with a direct current signal input end;
the coupling network is connected with the output end of the direct current amplifier AMP and the direct current signal output end;
the direct current signal input end and the direct current signal output end are electrically connected, and the coupling network enables the direct current inverted signal output by the direct current amplifier AMP and the input direct current signal to be mutually offset.
Specifically, as shown in fig. 1, the ac signal coupling network includes a first capacitor C01, a first resistor R01; an output terminal of the first resistor R01 is grounded, an input terminal of the first resistor R01 is electrically connected to the positive terminal of the dc amplifier AMP and an output terminal of the first capacitor C01, and an input terminal of the first capacitor C01 is electrically connected to the dc signal input terminal. The frequency selection network comprises a second capacitor C02 and a second resistor R02, the coupling network comprises a third resistor R03, and the direct current signal input end and the direct current signal output end are the same end point; an input end of the second resistor R02 is electrically connected to a dc signal input end, an output end of the second resistor R02 is electrically connected to an input end of the second capacitor C02 and an inverted end of the dc amplifier AMP, an output end of the second capacitor C02 is electrically connected to an output end of the dc amplifier AMP and an output end of the third resistor R03, and an input end of the third resistor R03 is electrically connected to a dc signal input end.
It is noted that the dc amplifier AMP is a low dc offset, high input impedance, high gain, high speed amplifier. The low frequency response of the high pass filter is very low (approximately 0Hz) and the low frequency response of the ac signal coupling network is approximately 0 Hz. The direct current amplifier AMP is connected to an inverting amplifier, and then is connected to ground in combination with one end of the first resistor R01, so that the non-inverting end of the direct current amplifier AMP is a virtual ground, and a weak negative voltage floating on the ground is generated.
After the second resistor R02, the second capacitor C02 and the dc amplifier AMP form an inverting amplifier, the low frequency response of the frequency selection network formed by the second resistor R02 and the second capacitor C02 is also approximately 0Hz because the values of the second resistor R02 and the second capacitor C02 are very large. Further, the larger the values of the second capacitor C02 and the second resistor R02 are, the lower the low-frequency response of the frequency-selective network is. Similarly, the values of the first resistor R01 and the first capacitor C01 are also large, so that the low-frequency response of the ac signal coupling network formed by the first resistor R01 and the first capacitor C01 is also approximate to 0Hz, and further, the larger the values of the first capacitor C01 and the first resistor R01 are, the lower the low-frequency response of the positive phase end of the dc amplifier AMP is.
Therefore, a dc inverted signal with a frequency of approximately 0Hz and opposite to the dc input is output at the output of the dc amplifier AMP, and this dc inverted signal is coupled through the coupling network (third resistor R03), and the dc signals at the dc input, output (input-output) and input cancel each other out.
Specifically, as shown in fig. 1, the device further includes a third capacitor R03, the third capacitor R03 is a power decoupling capacitor, and the third capacitor R03 is connected in parallel between the positive power source VCC and the negative power source VEE.
It should be noted that, as shown in fig. 2, the output and input ends of the dc signals are connected together, the positive phase signal, the inverted phase signal and the frequency selection network enter the inverted phase dc servo circuit 301 after dc coupling, and the pulsating dc signal output by the inverted phase dc servo circuit 301 is offset by the positive pulsating dc signal input by the adder or the dc offset circuit after dc coupling. Therefore, the implementation method can be divided into three parts, namely an inverted direct current servo circuit 301 for output, a positive phase signal, an inverted phase signal and a frequency selection network 201 for input, wherein the input and the output ends of the direct current signal comprise a positive polarity pulsating direct current signal input through a direct current coupled adder/direct current cancellation circuit and a pulsating direct current signal 101 output by the inverted direct current servo circuit, so that cancellation is realized at the input and the output ends (the same endpoint) of the direct current signal.
In summary, the dc amplifier AMP, the ac signal coupling network, the frequency selection network, the coupling network, and other circuits are connected together through a smart layout, so that the overall size of the dc servo circuit is reduced, the dc signal input end and the dc signal output end are combined at the same end point, the dc signal output by the amplifier and the input dc signal are offset, an active dc servo function is achieved, the dc offset of the dc input and output ends is greatly reduced, and the circuit has low power consumption, high efficiency, and a wide adaptation range. The practical value of the invention is greatly improved.
The above-described examples merely represent one or more embodiments of the present invention, which are described in greater detail and detail, but are not to be construed as limiting the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the spirit of the invention, which falls within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (8)
1. A dc servo circuit, comprising: the direct current amplifier is electrically connected with the positive power supply and the negative power supply;
the positive phase end of the direct current amplifier is electrically connected with an alternating current signal coupling network or a high-pass filter, the low-frequency response of the positive phase end of the direct current amplifier is reduced through the alternating current signal coupling network or the high-pass filter, and the alternating current signal coupling network or the high-pass filter is electrically connected with a direct current signal input end;
the frequency selection network is electrically connected with the direct current amplifier, the frequency selection network and the direct current amplifier form an inverting amplifier, the low-frequency response of a negative phase end of the direct current amplifier is reduced through the frequency selection network, the alternating current signal coupling network or the high-pass filter is electrically connected with the frequency selection network, and the frequency selection network is electrically connected with a direct current signal input end;
the coupling network is connected with the output end of the direct current amplifier and the direct current signal output end;
the direct current signal input end is electrically connected with the direct current signal output end, and the coupling network offsets the direct current inverted signal output by the direct current amplifier and the input direct current signal.
2. A dc servo circuit according to claim 1, wherein the dc signal input terminal and the dc signal output terminal are at the same terminal.
3. A dc servo circuit as claimed in claim 1 wherein the ac signal coupling network and the high pass filter generate a floating negative voltage at the positive side of the dc amplifier.
4. A dc servo circuit as claimed in claim 1 wherein the ac signal coupling network comprises a first capacitor, a first resistor;
the output end of the first resistor is grounded, the input end of the first resistor is electrically connected with the positive phase end of the direct current amplifier and the output end of the first capacitor, and the input end of the first capacitor is electrically connected with the direct current signal input end.
5. A DC servo circuit according to claim 4, wherein the frequency-selecting network comprises a second capacitor and a second resistor, the coupling network comprises a third resistor, and the DC signal input terminal and the DC signal output terminal are at the same end point;
the input end of the second resistor is electrically connected with the direct current signal input end, the output end of the second resistor is electrically connected with the input end of the second capacitor and the negative phase end of the direct current amplifier, the output end of the second capacitor is electrically connected with the output end of the direct current amplifier and the output end of the third resistor, and the input end of the third resistor is electrically connected with the direct current signal input end.
6. The DC servo circuit of claim 4, wherein the larger the values of the first capacitor and the first resistor are, the lower the low frequency response of the positive phase end of the DC amplifier is.
7. The DC servo circuit of claim 5, wherein the larger the values of the second capacitor and the second resistor are, the lower the low frequency response of the frequency-selective network is.
8. A dc servo circuit according to claim 1, further comprising a third capacitor, said third capacitor being a power supply decoupling capacitor, said third capacitor being arranged between said positive power supply and said negative power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110898524.7A CN113630688B (en) | 2021-08-05 | 2021-08-05 | Direct current servo circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110898524.7A CN113630688B (en) | 2021-08-05 | 2021-08-05 | Direct current servo circuit |
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| Publication Number | Publication Date |
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| CN113630688A true CN113630688A (en) | 2021-11-09 |
| CN113630688B CN113630688B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110898524.7A Active CN113630688B (en) | 2021-08-05 | 2021-08-05 | Direct current servo circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004153699A (en) * | 2002-10-31 | 2004-05-27 | Seiko Epson Corp | Single phase/differential conversion circuit |
| CN202634379U (en) * | 2012-07-03 | 2012-12-26 | 四川蓝讯宝迩电子科技有限公司 | Direct-current coupling low-pass RC (remote control) active filter |
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| CN103095233A (en) * | 2013-01-23 | 2013-05-08 | 电子科技大学 | Amplifier eliminating direct current offsets |
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| CN109495137A (en) * | 2019-01-15 | 2019-03-19 | 广东志成冠军集团有限公司 | A kind of the signal coupled system and method for subsea DC power transmission cable |
| CN208836000U (en) * | 2018-09-18 | 2019-05-07 | 广州市特沃能源管理有限公司 | A kind of adjustable DC output circuit |
| CN212660148U (en) * | 2020-05-20 | 2021-03-05 | 海能达通信股份有限公司 | Voltage-controlled oscillator and frequency generator |
| CN112653455A (en) * | 2020-12-04 | 2021-04-13 | 电子科技大学 | High-frequency low-power-consumption self-mixing millimeter wave voltage-controlled oscillator |
| CN215773545U (en) * | 2021-08-05 | 2022-02-08 | 东莞凯韵科技有限公司 | Direct current servo circuit |
-
2021
- 2021-08-05 CN CN202110898524.7A patent/CN113630688B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004153699A (en) * | 2002-10-31 | 2004-05-27 | Seiko Epson Corp | Single phase/differential conversion circuit |
| CN102957319A (en) * | 2011-08-29 | 2013-03-06 | 邱月美 | Power inverter pulse-width modulation control circuit and method |
| CN202634379U (en) * | 2012-07-03 | 2012-12-26 | 四川蓝讯宝迩电子科技有限公司 | Direct-current coupling low-pass RC (remote control) active filter |
| CN103078488A (en) * | 2012-12-29 | 2013-05-01 | 东南大学 | Digital power factor correction controller with fast transient response function |
| CN103095233A (en) * | 2013-01-23 | 2013-05-08 | 电子科技大学 | Amplifier eliminating direct current offsets |
| CN106602851A (en) * | 2017-01-11 | 2017-04-26 | 哈尔滨工业大学深圳研究生院 | Low frequency pulse current ripple inhibition circuit suitable for pulse load |
| CN207410306U (en) * | 2017-09-28 | 2018-05-25 | 重庆中科芯亿达电子有限公司 | A kind of alternating current-direct current signal distinguishes amplifying circuit |
| CN208836000U (en) * | 2018-09-18 | 2019-05-07 | 广州市特沃能源管理有限公司 | A kind of adjustable DC output circuit |
| CN109495137A (en) * | 2019-01-15 | 2019-03-19 | 广东志成冠军集团有限公司 | A kind of the signal coupled system and method for subsea DC power transmission cable |
| CN212660148U (en) * | 2020-05-20 | 2021-03-05 | 海能达通信股份有限公司 | Voltage-controlled oscillator and frequency generator |
| CN112653455A (en) * | 2020-12-04 | 2021-04-13 | 电子科技大学 | High-frequency low-power-consumption self-mixing millimeter wave voltage-controlled oscillator |
| CN215773545U (en) * | 2021-08-05 | 2022-02-08 | 东莞凯韵科技有限公司 | Direct current servo circuit |
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| CN113630688B (en) | 2024-05-17 |
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