CN112994425B - Noise suppression method, noise suppression circuit and switching circuit - Google Patents
Noise suppression method, noise suppression circuit and switching circuit Download PDFInfo
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- CN112994425B CN112994425B CN202110178435.5A CN202110178435A CN112994425B CN 112994425 B CN112994425 B CN 112994425B CN 202110178435 A CN202110178435 A CN 202110178435A CN 112994425 B CN112994425 B CN 112994425B
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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
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Abstract
The invention discloses a noise suppression method, a noise suppression circuit and a switch circuit, wherein the noise suppression method is used for filtering an input voltage and outputting a first filtering voltage; filtering the first filtering voltage and outputting a second filtering voltage; making a difference between the first filtering voltage and the second filtering voltage to obtain a shaped differential voltage; and comparing the shaped differential voltage with a first threshold value or/and a second threshold value to output a shaped voltage. The invention can effectively filter the common mode noise and is simple and convenient to realize.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a noise suppression method, a noise suppression circuit and a switching circuit.
Background
The power ground of the transmitting end and the receiving end of the communication and the signal are connected through a long wire, so that common-mode interference is easy to generate in the transmission process, and normal communication is influenced. Especially in switching power supplies, common mode interference can be significant. The existing method for filtering out common mode noise is to compare the signal with a fixed threshold. When the common mode noise is large to a certain degree, the fixed threshold comparison method cannot filter the common mode noise, and if the power supply voltage is low, the existing threshold comparison method cannot have enough margin to ensure that the high and low level judgment is normal. Therefore, in an application environment where the common mode noise is relatively large, a more optimized noise suppression method is required.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a noise suppression method, a noise suppression circuit and a switching circuit, so as to solve the problems that in the prior art, when the common mode noise is large to a certain extent, the common mode noise cannot be filtered by a fixed threshold comparison method, and if the power supply voltage is low, the conventional threshold comparison method is difficult to have enough margin to ensure that the high and low level determination is normal.
The technical scheme of the invention is that a noise suppression method is provided, which filters an input voltage and outputs a first filtering voltage; filtering the first filtering voltage and outputting a second filtering voltage; making a difference between the first filtering voltage and the second filtering voltage to obtain a shaped differential voltage; and comparing the shaped differential voltage with a first threshold value and a second threshold value respectively to output a shaped voltage.
Optionally, performing RC filtering on the input voltage, and outputting a first filtered voltage; and performing RC filtering on the first filtering voltage and outputting a second filtering voltage.
Optionally, when the shaped differential voltage is greater than a first threshold, the output shaped voltage is changed from inactive to active; when the shaped differential voltage is less than a second threshold, the output shaped voltage changes from active to inactive.
The invention also provides a noise suppression circuit, which comprises a first filter circuit, a second filter circuit, a subtraction circuit and a voltage comparison circuit, wherein the first filter circuit filters the input voltage and outputs a first filter voltage; the second filter circuit filters the first filter voltage and outputs a second filter voltage; the subtraction circuit performs a difference between the first filtered voltage and the second filtered voltage to obtain a shaped differential voltage, and the voltage comparison circuit receives the shaped differential voltage, compares the shaped differential voltage with a first threshold and a second threshold, and outputs the shaped voltage.
Optionally, the first filter circuit includes a first resistor and a first capacitor; the input voltage passes through an RC filter circuit consisting of the first resistor and the first capacitor, and the first filter voltage is output; the second filter circuit comprises a second resistor and a second capacitor; and the first filtered voltage passes through an RC (resistance-capacitance) filter circuit consisting of the second resistor and the second capacitor, and the second filtered voltage is output.
Optionally, the subtracting circuit includes a first voltage-to-current circuit, a second voltage-to-current circuit and a third resistor, the first voltage-to-current circuit converts the first filtered voltage into a first current, the second voltage-to-current circuit converts the second filtered voltage into a second current, the outputs of the first voltage-to-current circuit and the second voltage-to-current circuit are both connected to the third resistor, and the voltage across the third resistor is the shaped differential voltage.
Optionally, in the voltage comparison circuit, when the shaped differential voltage is greater than a first threshold, the shaped voltage is changed from inactive to active; the shaped voltage changes from active to inactive when the shaped differential voltage is less than a second threshold.
Optionally, the voltage comparison circuit includes a first comparison circuit, a second comparison circuit, and a logic circuit, the first comparison circuit and the second comparison circuit both receive the shaped differential voltage, the first comparison circuit compares the shaped differential voltage with a first threshold value, the second comparison circuit compares the shaped differential voltage with a second threshold value, the logic circuit receives output voltages of the first comparison circuit and the second comparison circuit and outputs a shaped voltage, and when the shaped differential voltage is greater than the first threshold value, the shaped voltage changes from inactive to active; when the shaped differential voltage is less than a second threshold, the shaped voltage changes from active to inactive.
Optionally, the voltage comparison circuit comprises a third comparison circuit, a threshold selection circuit and a logic circuit, the third comparison circuit receives the shaped differential voltage and an output voltage of the threshold selection circuit; the threshold selection circuit outputs different thresholds according to the output voltage of the logic circuit; the logic circuit receives the output voltage of the third comparison circuit and outputs a shaping voltage, and when the shaping differential voltage is greater than a first threshold value, the shaping voltage is changed from invalid to valid; the shaped voltage changes from active to inactive when the shaped differential voltage is less than a second threshold.
Another technical solution of the present invention is to provide a switching circuit.
Compared with the prior art, the circuit structure and the method have the following advantages that: even when the power supply voltage is lower, the common mode noise can be effectively filtered, and the realization is simple and convenient.
Drawings
FIG. 1 is a schematic diagram of an ideal waveform without common mode interference and an actual waveform subjected to common mode interference;
FIG. 2 is a graph of an input voltage waveform, a first filtered voltage waveform, a second filtered voltage waveform, and a shaped voltage waveform in accordance with the present invention;
FIG. 3 is a block diagram of a noise suppression circuit according to an embodiment of the present invention;
FIG. 4 is an implementation of a first filter circuit and a second filter circuit in accordance with an embodiment of the present invention;
FIG. 5 is a block diagram of an implementation of subtraction circuit 100, according to an embodiment of the present invention;
FIG. 6 is an implementation of the first voltage-to-current circuit 110 according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating an implementation of the second voltage-to-current circuit 120 according to an embodiment of the present invention;
FIG. 8 is an implementation of a voltage comparison circuit 200, according to an embodiment of the present invention;
FIG. 9 is a diagram of an implementation of a voltage comparison circuit 200 according to another embodiment of the present invention;
FIG. 10 is an implementation of threshold selection circuit 210, in accordance with an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is more particularly described in the following paragraphs with reference to the accompanying drawings by way of example. It should be noted that the drawings are in simplified form and are not to precise scale, which is only used for convenience and clarity to assist in describing the embodiments of the present invention.
The invention provides a noise suppression circuit, which comprises a first filter circuit, a second filter circuit, a subtraction circuit and a voltage comparison circuit, wherein the first filter circuit filters an input voltage and outputs a first filter voltage; the second filter circuit filters the first filter voltage and outputs a second filter voltage; the subtraction circuit performs a difference between the first filtered voltage and the second filtered voltage to obtain a shaped differential voltage, and the voltage comparison circuit receives the shaped differential voltage, compares the shaped differential voltage with a first threshold and a second threshold, and outputs the shaped voltage. Referring to fig. 2, an input voltage waveform, a first filtered voltage waveform, a second filtered voltage waveform and a shaped voltage waveform according to the present invention are shown; fig. 3 is a block diagram of a noise suppression circuit according to an embodiment of the present invention. At the rising edge of the input voltage, the shaped differential voltage is positive; at the falling edge of the input voltage, the shaped differential voltage is negative. The first threshold value of the comparison is positive at the rising edge and the second threshold value of the comparison is negative at the falling edge. And the first threshold and the second threshold require selection of appropriate values to optimize the sensitivity and noise immunity of the noise suppression circuit.
The first filter circuit and the second filter circuit may be implemented by using various filter circuits, and RC filtering is a relatively common filter circuit. Referring to fig. 4, an embodiment of the present invention is shown in which the first filter circuit and the second filter circuit employ RC filtering. The first filter circuit comprises a first resistor R1 and a first capacitor C1; the input voltage passes through an RC filter circuit consisting of the first resistor R1 and a first capacitor C1, and the first filtered voltage is output; the second filter circuit comprises a second resistor R2 and a second capacitor C2; the first filtered voltage passes through an RC filter circuit consisting of the second resistor R2 and a second capacitor C2, and the second filtered voltage is output.
Referring to fig. 5, the subtracting circuit 100 includes a first voltage-to-current circuit 110, a second voltage-to-current circuit 130 and a third resistor R110, the first voltage-to-current circuit 110 converts the first filtered voltage into a first current, the second voltage-to-current circuit converts the second filtered voltage into a second current, outputs of the first voltage-to-current circuit and the second voltage-to-current circuit are both connected to the third resistor R110, and a voltage across the third resistor R110 is the shaped differential voltage.
Referring to fig. 6, an implementation of the first voltage-to-current circuit 110 is shown in an embodiment of the present invention. The first voltage-to-current circuit 110 includes an operational amplifier 111, a MOS transistor M111, and a resistor R111. The positive input terminal of the operational amplifier 111 receives an input voltage, i.e. a voltage to be converted into a current; the output of the operational amplifier 111 is connected to the gate of the MOS transistor M111, the source of the MOS transistor M111 is connected to the reference ground through the resistor R111, the negative input terminal of the operational amplifier is connected to the common terminal of the MOS transistor M111 and the resistor R111, and the current magnitude on the drain of the MOS transistor M111 represents the magnitude of the input voltage.
Referring to fig. 7, an implementation of the second voltage-to-current circuit 120 is shown in an embodiment of the present invention. The second voltage-to-current circuit 120 includes an operational amplifier 121, a MOS transistor M121, a resistor R121, and a current mirror 122. The connection mode of the operational amplifier 121, the MOS transistor M121 and the resistor R121 is the same as that of the operational amplifier 111, and the connection mode of the MOS transistor M111 and the resistor R111 is the same as that of the operational amplifier 111. To achieve current subtraction, the M121 drain current needs to be reversed, so a current mirror 122 is added. The drain current of M121 generates a current I121 through the current mirror, which is the output current of the second voltage-to-current circuit 120.
In one embodiment, in the voltage comparison circuit, the shaped voltage changes from inactive to active when the shaped differential voltage is greater than a first threshold; when the shaped differential voltage is less than a second threshold, the shaped voltage changes from active to inactive. In one embodiment, active may correspond to high and inactive may correspond to low; in another embodiment, the high level may also be asserted and de-asserted.
In one embodiment, referring to fig. 8, the voltage comparison circuit 200 includes a first comparison circuit 201, a second comparison circuit 202 and a logic circuit 203, wherein the first comparison circuit 201 and the second comparison circuit 202 both receive the shaped differential voltage, the first comparison circuit 201 compares the shaped differential voltage with a first threshold, the second comparison circuit 202 compares the shaped differential voltage with a second threshold, the logic circuit 203 receives the output voltages of the first comparison circuit 201 and the second comparison circuit 202 and outputs a shaped voltage, and when the shaped differential voltage is greater than the first threshold, the shaped voltage is changed from inactive to active; when the shaped differential voltage is less than a second threshold, the shaped voltage changes from active to inactive.
In another embodiment, the voltage comparison circuit 200 may use only one comparator, the voltage comparison circuit comprising a third comparison circuit 205, a threshold selection circuit 210 and a logic circuit 206, the third comparison circuit 206 receiving the shaped differential voltage and the output voltage of the threshold selection circuit; the threshold selection circuit outputs different thresholds according to the output voltage of the logic circuit 206; the logic circuit 206 receives the output voltage of the third comparing circuit 205 and outputs a shaped voltage, and when the shaped differential voltage is greater than a first threshold value, the shaped voltage is changed from inactive to active; when the shaped differential voltage is less than a second threshold, the shaped voltage changes from active to inactive.
Referring to fig. 10, one embodiment of a threshold selection circuit 210 is shown. The threshold selection circuit includes a switch K211 and a switch K212. The first threshold is connected to an input of the third comparing circuit 205 via a switch K211, and the second threshold is also connected to the same input of the third comparing circuit 205 via a switch K212. The logic circuit 206 controls the on and off of the switches K211 and K212. When the shaping voltage is valid, for example, a high level, K212 is turned on, K211 is turned off, and the input end of the third comparing circuit receives a second threshold voltage; when the shaping voltage is inactive, e.g., low, then K211 is turned on, K212 is turned off, and the third comparator input receives the first threshold voltage.
The invention also provides a noise suppression method, which is used for filtering the input voltage and outputting a first filtering voltage; filtering the first filtering voltage and outputting a second filtering voltage; making a difference between the first filtering voltage and the second filtering voltage to obtain a shaped differential voltage; and comparing the shaped differential voltage with a first threshold value and a second threshold value respectively to output a shaped voltage.
In one embodiment, an input voltage is RC filtered, and a first filtered voltage is output; and performing RC filtering on the first filtering voltage and outputting a second filtering voltage.
In one embodiment, the output shaped voltage is changed from inactive to active when the shaped differential voltage is greater than a first threshold; when the shaped differential voltage is less than a second threshold, the output shaped voltage changes from active to inactive.
The invention also provides a switching circuit comprising the noise suppression method or the noise suppression circuit.
In addition, although the embodiments are described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments without explicit mention.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (10)
1. A method of noise suppression, characterized by: filtering the input voltage and outputting a first filtered voltage; filtering the first filtering voltage and outputting a second filtering voltage; the difference is made between the first filtering voltage and the second filtering voltage to obtain a shaped differential voltage; respectively comparing the shaped differential voltage with a first threshold value and a second threshold value, and outputting a shaped voltage; the shaping voltage is the voltage of the input voltage after common mode noise is filtered.
2. The noise suppression method according to claim 1, characterized in that: performing RC filtering on the input voltage and outputting a first filtering voltage; and performing RC filtering on the first filtering voltage and outputting a second filtering voltage.
3. The noise suppression method according to claim 1, characterized in that: when the shaped differential voltage is greater than a first threshold, the output shaped voltage is changed from inactive to active; when the shaped differential voltage is less than a second threshold, the output shaped voltage changes from active to inactive.
4. A noise suppression circuit, characterized by: the voltage-stabilizing circuit comprises a first filter circuit, a second filter circuit, a subtraction circuit and a voltage comparison circuit, wherein the first filter circuit filters input voltage and outputs first filtered voltage; the second filter circuit filters the first filter voltage and outputs a second filter voltage; the subtraction circuit performs difference on the first filtering voltage and the second filtering voltage to obtain a shaped differential voltage, and the voltage comparison circuit receives the shaped differential voltage, compares the shaped differential voltage with a first threshold value and a second threshold value respectively and outputs a shaped voltage; the shaping voltage is the voltage of the input voltage after common mode noise is filtered.
5. The noise suppression circuit according to claim 4, wherein: the first filter circuit comprises a first resistor and a first capacitor; the input voltage passes through an RC filter circuit consisting of the first resistor and the first capacitor, and the first filtered voltage is output; the second filter circuit comprises a second resistor and a second capacitor; and the first filtered voltage passes through an RC (resistance-capacitance) filter circuit consisting of the second resistor and the second capacitor, and the second filtered voltage is output.
6. The noise suppression circuit according to claim 4, wherein: the subtracting circuit comprises a first voltage-to-current circuit, a second voltage-to-current circuit and a third resistor, wherein the first voltage-to-current circuit converts the first filtered voltage into a first current, the second voltage-to-current circuit converts the second filtered voltage into a second current, the outputs of the first voltage-to-current circuit and the second voltage-to-current circuit are both connected to the third resistor, and the voltage on the third resistor is the shaped differential voltage.
7. The noise suppression circuit of claim 4, wherein: in the voltage comparison circuit, when the shaped differential voltage is greater than a first threshold, the shaped voltage is changed from inactive to active; when the shaped differential voltage is less than a second threshold, the shaped voltage changes from active to inactive.
8. The noise suppression circuit according to claim 7, wherein: the voltage comparison circuit includes a first comparison circuit, a second comparison circuit, and a logic circuit, the first comparison circuit and the second comparison circuit both receiving the shaped differential voltage, the first comparison circuit comparing the shaped differential voltage with a first threshold value, the second comparison circuit comparing the shaped differential voltage with a second threshold value, the logic circuit receiving output voltages of the first comparison circuit and the second comparison circuit and outputting a shaped voltage, the shaped voltage changing from inactive to active when the shaped differential voltage is greater than the first threshold value; when the shaped differential voltage is less than a second threshold, the shaped voltage changes from active to inactive.
9. The noise suppression circuit of claim 7, wherein: the voltage comparison circuit comprises a third comparison circuit, a threshold selection circuit and a logic circuit, wherein the third comparison circuit receives the shaped differential voltage and the output voltage of the threshold selection circuit; the threshold selection circuit outputs different thresholds according to the output voltage of the logic circuit; the logic circuit receives the output voltage of the third comparison circuit and outputs a shaped voltage, and when the shaped differential voltage is greater than a first threshold value, the shaped voltage is changed from invalid to valid; the shaped voltage changes from active to inactive when the shaped differential voltage is less than a second threshold.
10. A switching circuit, characterized by: comprising the use of the noise suppression method of any of claims 1 to 3 or the noise suppression circuit of any of claims 4 to 9.
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| CN202110178435.5A CN112994425B (en) | 2021-02-07 | 2021-02-07 | Noise suppression method, noise suppression circuit and switching circuit |
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| CN202110178435.5A CN112994425B (en) | 2021-02-07 | 2021-02-07 | Noise suppression method, noise suppression circuit and switching circuit |
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| CN112994425B true CN112994425B (en) | 2022-07-15 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858941A (en) * | 2010-03-30 | 2010-10-13 | 矽创电子股份有限公司 | Capacitor sensing circuit having anti-electromagnetic interference capability |
| CN201726182U (en) * | 2010-07-05 | 2011-01-26 | 上海新华电子设备有限公司 | High voltage ultracapacitor power battery charger |
| CN203537333U (en) * | 2013-11-12 | 2014-04-09 | 四川红宇创智信息科技有限责任公司 | Pre-amplification electric circuit of infrared temperature human detector |
| CN104868466A (en) * | 2015-04-27 | 2015-08-26 | 华为技术有限公司 | Filtering device and power supply system |
| CN206440802U (en) * | 2016-09-28 | 2017-08-25 | 西门子瑞士有限公司 | The observation circuit of monitoring field stem grafting dotted state |
| CN107290581A (en) * | 2017-06-30 | 2017-10-24 | 杰华特微电子（张家港）有限公司 | The current detection circuit and on-off circuit of a kind of on-off circuit |
| CN207241434U (en) * | 2017-08-25 | 2018-04-17 | 比亚迪股份有限公司 | Display instrument and automobile for automobile |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8755158B2 (en) * | 2012-05-01 | 2014-06-17 | Texas Instruments Incorporated | ESD protection system optimized at board level |
| CN104536416B (en) * | 2014-12-25 | 2017-05-10 | 重庆川仪自动化股份有限公司 | Analog quantity input acquisition circuit for restraining electromagnetic interference in industrial control system |
| JP6935867B2 (en) * | 2018-02-27 | 2021-09-15 | 日本電信電話株式会社 | Active noise filter |
-
2021
- 2021-02-07 CN CN202110178435.5A patent/CN112994425B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858941A (en) * | 2010-03-30 | 2010-10-13 | 矽创电子股份有限公司 | Capacitor sensing circuit having anti-electromagnetic interference capability |
| CN201726182U (en) * | 2010-07-05 | 2011-01-26 | 上海新华电子设备有限公司 | High voltage ultracapacitor power battery charger |
| CN203537333U (en) * | 2013-11-12 | 2014-04-09 | 四川红宇创智信息科技有限责任公司 | Pre-amplification electric circuit of infrared temperature human detector |
| CN104868466A (en) * | 2015-04-27 | 2015-08-26 | 华为技术有限公司 | Filtering device and power supply system |
| CN206440802U (en) * | 2016-09-28 | 2017-08-25 | 西门子瑞士有限公司 | The observation circuit of monitoring field stem grafting dotted state |
| CN107290581A (en) * | 2017-06-30 | 2017-10-24 | 杰华特微电子（张家港）有限公司 | The current detection circuit and on-off circuit of a kind of on-off circuit |
| CN207241434U (en) * | 2017-08-25 | 2018-04-17 | 比亚迪股份有限公司 | Display instrument and automobile for automobile |
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