CN112305299B - Alternating current sampling device - Google Patents
Alternating current sampling device Download PDFInfo
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- CN112305299B CN112305299B CN202011119583.1A CN202011119583A CN112305299B CN 112305299 B CN112305299 B CN 112305299B CN 202011119583 A CN202011119583 A CN 202011119583A CN 112305299 B CN112305299 B CN 112305299B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of AC into DC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/04—Measuring peak values or amplitude or envelope of AC or of pulses
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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Abstract
The invention discloses an alternating current sampling device, which comprises: the alternating voltage sampling circuit is used for sampling the voltage of alternating current to obtain low-voltage alternating sampling voltage; the rectifying circuit is used for rectifying alternating current and converting the alternating voltage into direct current voltage with constant voltage; the direct-current voltage sampling circuit is used for sampling direct-current voltage obtained by converting the alternating-current voltage to obtain direct-current sampling voltage; and the inverting input end of the comparator is grounded, the non-inverting input end of the comparator is connected with the alternating current sampling voltage output by the alternating current voltage sampling circuit, the power supply end of the comparator is connected with the direct current sampling voltage output by the direct current voltage sampling circuit, and the output end of the comparator is used for outputting a sampling signal containing alternating current voltage amplitude information and a zero-crossing signal. By adopting the technical scheme of the invention, the amplitude information and the zero-crossing signal of the alternating current can be integrated into one signal.
Description
Technical Field
The invention relates to the field of alternating current signal sampling, in particular to a sampling device for sampling an alternating current zero crossing point and a voltage amplitude.
Background
At present, the zero crossing point detection and the amplitude sampling of alternating voltage of a frequency converter and an inverter are detected by separate circuits, and a controller chip respectively obtains signals of the zero crossing point detection and the voltage sampling, so that two detection channels of the controller chip are required to carry out signal detection. Both the zero-crossing detection and the voltage sampling occupy the ports of the controller chip, resulting in excessive occupation of the ports of the controller chip and insufficient occupation of other ports of the controller chip.
Disclosure of Invention
The invention aims to solve the technical problem that alternating current zero-crossing detection and voltage amplitude sampling in the prior art occupy multiple ports of a controller chip, and provides an alternating current sampling device capable of simultaneously sampling an alternating current zero-crossing point and a voltage amplitude.
In an embodiment of the present invention, an ac power sampling apparatus is provided, which includes:
the alternating voltage sampling circuit is used for sampling the voltage of alternating current to obtain low-voltage alternating sampling voltage;
the rectifying circuit is used for rectifying alternating current and converting the alternating voltage into direct current voltage with constant voltage;
the direct-current voltage sampling circuit is used for sampling the direct-current voltage output by the rectifying circuit to obtain direct-current sampling voltage;
and the inverting input end of the comparator is grounded, the non-inverting input end of the comparator is connected with the alternating current sampling voltage output by the alternating current voltage sampling circuit, the power supply end of the comparator is connected with the direct current sampling voltage output by the direct current voltage sampling circuit, and the output end of the comparator is used for outputting a sampling signal containing alternating current voltage amplitude information and a zero-crossing signal.
In an embodiment of the present invention, the dc voltage sampling circuit includes:
the first voltage division circuit is used for dividing the positive voltage and the negative voltage of the direct current output by the rectifying circuit to obtain a positive sampling voltage and a negative sampling voltage of the direct current;
and the first operational amplifier processing circuit is used for obtaining the direct current sampling voltage according to the positive electrode sampling voltage and the negative electrode sampling voltage of the direct current.
In the embodiment of the invention, the first operational amplifier processing circuit includes an operational amplifier F1 and a resistor R8 connected between the negative input terminal and the output terminal of the operational amplifier F1.
In the embodiment of the present invention, the first voltage dividing circuit includes resistors R1, R2, R3, R4, R5, R6, and R7, resistors R1 and R2 are connected in series between the positive voltage output terminal of the rectifier circuit and the positive input terminal of the operational amplifier F1, resistors R3 and R4 are connected in series between the negative voltage output terminal of the rectifier circuit and the negative input terminal of the operational amplifier F1, resistor R5 is connected between the connection point of the resistors R1 and R2 and ground, R6 is connected between the connection point of the resistors R3 and R4 and ground, and R7 is connected between the positive input terminal of the operational amplifier F1 and ground.
In an embodiment of the present invention, the ac voltage sampling circuit includes:
the second voltage division circuit is used for dividing the voltage output by the alternating current live wire and the alternating current zero line to obtain the sampling voltage of the alternating current live wire and the sampling voltage of the alternating current zero line;
and the second operational amplifier processing circuit is used for obtaining the alternating current sampling voltage according to the sampling voltage of the alternating current live wire and the sampling voltage of the alternating current zero line.
In the embodiment of the present invention, the second operational amplifier processing circuit includes an operational amplifier F2 and a resistor R16 connected between the negative input terminal and the output terminal of the operational amplifier F2.
In the embodiment of the present invention, the second voltage dividing circuit includes resistors R9, R10, R11, R12, R13, R14, and R15, the resistors R9 and R10 are connected in series between the ac live line and the positive input terminal of the operational amplifier F2, the resistors R11 and R12 are connected in series between the ac neutral line and the negative input terminal of the operational amplifier F2, the resistor R13 is connected between the connection point of the resistors R9 and R10 and ground, the resistor R14 is connected between the connection point of the resistors R11 and R12 and ground, and the resistor R15 is connected between the positive input terminal of the operational amplifier F1 and ground.
In the embodiment of the invention, the amplitude of the direct current voltage output by the rectifying circuit is the effective voltage value of the alternating current.
In the embodiment of the invention, the direct-current voltage sampling circuit is realized by adopting a voltage sensor.
In the embodiment of the invention, the alternating voltage sampling circuit is realized by adopting a voltage sensor.
Compared with the prior art, in the alternating current sampling circuit, the inverting input end of the comparator is grounded, the non-inverting input end of the comparator is connected with the alternating current sampling voltage output by the alternating current voltage sampling circuit, the power supply end of the comparator is connected with the direct current sampling voltage output by the direct current voltage sampling circuit, the function of synthesizing a zero-crossing signal and a voltage amplitude signal can be realized, the output signal can change along with the amplitude and the frequency of the alternating current voltage, the voltage amplitude and the zero-crossing point can be detected only by the controller chip by detecting the signal, and the zero-crossing point and the voltage sampling do not need to be detected respectively, so that the port of the controller chip is saved.
Drawings
Fig. 1 is a circuit diagram of an alternating current sampling circuit according to an embodiment of the present invention.
Fig. 2 and fig. 3 are signal waveform diagrams obtained by sampling two kinds of alternating currents with different amplitudes by using the alternating current sampling circuit according to the embodiment of the present invention.
Fig. 4 and 5 are signal waveform diagrams obtained by sampling two kinds of alternating currents with different frequencies by using the alternating current sampling circuit according to the embodiment of the present invention.
Detailed Description
As shown in fig. 1, in the embodiment of the present invention, an ac sampling apparatus is provided, which includes a rectification circuit 1, a dc voltage sampling circuit 2, an ac voltage sampling circuit 3, and a comparator 4. The following description will be made separately.
The rectifying circuit 1 is configured to rectify an alternating current and convert the alternating current voltage into a direct current voltage with a constant voltage. The amplitude of the direct current voltage output by the rectifying circuit 1 is the effective voltage value of the alternating current, so that the amplitude information of the alternating current can be obtained by sampling the direct current voltage.
The direct current voltage sampling circuit 2 is configured to sample the direct current voltage output by the rectification circuit 1 to obtain a direct current sampling voltage. The dc voltage sampling circuit 2 includes a first voltage dividing circuit 21 and a first operational amplifier processing circuit 22. The first voltage dividing circuit 21 is configured to divide the positive voltage and the negative voltage of the direct current output by the rectifying circuit 1 to obtain a positive sampling voltage and a negative sampling voltage of the direct current. The first operational amplifier processing circuit 22 is configured to obtain the dc sampling voltage according to the positive sampling voltage and the negative sampling voltage of the dc.
Specifically, the first operational amplifier processing circuit comprises an operational amplifier F1 and a resistor R8 connected between the negative input end and the output end of the operational amplifier F1. The positive input end and the negative input end of the operational amplifier F1 are respectively connected to the positive sampled voltage and the negative sampled voltage of the direct current, and output the direct current sampled voltage. The first voltage division circuit comprises resistors R1, R2, R3, R4, R5, R6 and R7, the resistors R1 and R2 are connected in series between a positive voltage output end of the rectifying circuit and a positive input end of an operational amplifier F1, the resistors R3 and R4 are connected in series between a negative voltage output end of the rectifying circuit and a negative input end of the operational amplifier F1, the resistor R5 is connected between a connection point of the resistors R1 and R2 and the ground, the resistor R6 is connected between a connection point of the resistors R3 and R4 and the ground, and the resistor R7 is connected between the positive input end of the operational amplifier F1 and the ground.
And the alternating voltage sampling circuit 3 is used for sampling the voltage of the alternating current to obtain low-voltage alternating sampling voltage. The ac voltage sampling circuit 3 includes a second voltage dividing circuit 31 and a second operational amplifier processing circuit 32. The second voltage division circuit 31 is configured to divide the voltage output by the ac live wire and the ac zero line to obtain a sampling voltage of the ac live wire and a sampling voltage of the ac zero line. And the second operational amplifier processing circuit 32 is configured to obtain the ac sampling voltage according to the sampling voltage of the ac live wire and the sampling voltage of the ac zero line.
Specifically, the second operational amplifier processing circuit comprises an operational amplifier F2 and a resistor R16 connected between the negative input end and the output end of the operational amplifier F2. The positive input end and the negative input end of the operational amplifier F2 are respectively connected with the live wire sampling voltage and the zero line sampling voltage of the alternating current, and the alternating current sampling voltage is output. The second voltage division circuit comprises resistors R9, R10, R11, R12, R13, R14 and R15, the resistors R9 and R10 are connected in series between an alternating current live wire and the positive input end of an operational amplifier F2, the resistors R11 and R12 are connected in series between an alternating current neutral wire and the negative input end of the operational amplifier F2, the resistor R13 is connected between the connection point of the resistors R9 and R10 and the ground, the resistor R14 is connected between the connection point of the resistors R11 and R12 and the ground, and the R15 is connected between the positive input end of the operational amplifier F1 and the ground.
The inverting input end of the comparator 4 is grounded, the non-inverting input end is connected to the alternating-current sampling voltage output by the alternating-current voltage sampling circuit 3, the power supply end is connected to the direct-current sampling voltage output by the direct-current voltage sampling circuit 2, and the output end is used for outputting a sampling signal containing alternating-current voltage amplitude information and a zero-crossing signal.
As shown in fig. 2, the ac sampling voltage is a sine wave. The comparator 4 compares the alternating current sampling voltage with a ground line voltage, when the alternating current sampling voltage is greater than the ground line voltage, the comparator 4 outputs a high level, and when the alternating current sampling voltage is less than the ground line voltage, the comparator 4 outputs a low level and outputs a square wave as shown in fig. 2, so that the zero crossing point detection function of the alternating current is realized. The comparator 4 only has a function of comparing the voltages of the two input paths, the output voltage is 0V or the supply voltage, and the comparator has no amplification or following function, so that when the amplitude of the supply voltage of the comparator 4 changes, the amplitude of the output voltage of the comparator 4 changes along with the supply voltage of the comparator 4, as shown in fig. 3. When the frequency of the ac power is changed, the square wave frequency output by the comparator 4 is also changed along with the frequency of the ac power, as shown in fig. 4 and 5. Therefore, the signal output by the comparator 4 includes both the ac amplitude information and the ac zero-crossing signal.
The dc voltage sampling circuit 2 and the ac voltage sampling circuit 3 are not limited to the above circuit configuration, and may be implemented by other circuits, for example, by a voltage sensor.
In summary, in the ac sampling circuit of the present invention, the inverting input terminal of the comparator is grounded, the non-inverting input terminal is connected to the ac sampling voltage output by the ac voltage sampling circuit, and the power supply terminal is connected to the dc sampling voltage output by the dc voltage sampling circuit, so that a function of synthesizing a zero-crossing signal and a voltage amplitude signal can be realized, the output signal can change with the amplitude and frequency of the ac voltage, and the controller chip can detect the voltage amplitude and the zero-crossing point only by detecting the signal, and does not need to detect the zero-crossing point and the voltage sampling, thereby saving the port of the controller chip.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. An alternating current sampling apparatus, comprising:
the alternating voltage sampling circuit is used for sampling the voltage of alternating current to obtain low-voltage alternating sampling voltage;
the rectifying circuit is used for rectifying alternating current and converting alternating voltage into direct voltage with constant voltage, and the amplitude of the direct voltage output by the rectifying circuit is an effective voltage value of the alternating current;
the direct-current voltage sampling circuit is used for sampling the direct-current voltage output by the rectifying circuit to obtain direct-current sampling voltage;
and the inverting input end of the comparator is grounded, the non-inverting input end of the comparator is connected with the alternating current sampling voltage output by the alternating current voltage sampling circuit, the power supply end of the comparator is connected with the direct current sampling voltage output by the direct current voltage sampling circuit, and the output end of the comparator is used for outputting a sampling signal containing alternating current voltage amplitude information and a zero-crossing signal.
2. The ac current sampling device of claim 1, wherein the dc voltage sampling circuit comprises:
the first voltage division circuit is used for dividing the positive voltage and the negative voltage of the direct current output by the rectifying circuit to obtain a positive sampling voltage and a negative sampling voltage of the direct current;
and the first operational amplifier processing circuit is used for obtaining the direct current sampling voltage according to the positive electrode sampling voltage and the negative electrode sampling voltage of the direct current.
3. The ac current sampling device according to claim 1, wherein said first op-amp processing circuit comprises an operational amplifier F1 and a resistor R8 connected between the negative input terminal and the output terminal of the operational amplifier F1.
4. The ac current sampling device according to claim 3, wherein said first voltage dividing circuit comprises resistors R1, R2, R3, R4, R5, R6, R7, resistors R1, R2 are connected in series between the positive voltage output terminal of said rectifying circuit and the positive input terminal of operational amplifier F1, resistors R3, R4 are connected in series between the negative voltage output terminal of said rectifying circuit and the negative input terminal of operational amplifier F1, resistor R5 is connected between the connection point of resistors R1, R2 and ground, R6 is connected between the connection point of resistors R3, R4 and ground, and resistor R7 is connected between the positive input terminal of operational amplifier F1 and ground.
5. The alternating current sampling apparatus of claim 1, wherein the alternating voltage sampling circuit comprises:
the second voltage division circuit is used for dividing the voltage output by the alternating current live wire and the alternating current zero line to obtain the sampling voltage of the alternating current live wire and the sampling voltage of the alternating current zero line;
and the second operational amplifier processing circuit is used for obtaining the alternating current sampling voltage according to the sampling voltage of the alternating current live wire and the sampling voltage of the alternating current zero line.
6. The ac current sampling device according to claim 5, wherein said second op-amp processing circuit comprises an operational amplifier F2 and a resistor R16 connected between the negative input terminal and the output terminal of the operational amplifier F2.
7. The alternating current sampling device of claim 6, wherein the second voltage division circuit comprises resistors R9, R10, R11, R12, R13, R14 and R15, the resistors R9 and R10 are connected in series between the alternating current live wire and the positive input end of an operational amplifier F2, the resistors R11 and R12 are connected in series between the alternating current neutral wire and the negative input end of the operational amplifier F2, the resistor R13 is connected between the connection point of the resistors R9 and R10 and the ground, the resistor R14 is connected between the connection point of the resistors R11 and R12 and the ground, and the resistor R15 is connected between the positive input end of the operational amplifier F1 and the ground.
8. The ac current sampling device of claim 1, wherein said dc voltage sampling circuit is implemented using a voltage sensor.
9. The ac current sampling device of claim 1, wherein said ac voltage sampling circuit is implemented using a voltage sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011119583.1A CN112305299B (en) | 2020-10-19 | 2020-10-19 | Alternating current sampling device |
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| CN202011119583.1A CN112305299B (en) | 2020-10-19 | 2020-10-19 | Alternating current sampling device |
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| CN112305299A CN112305299A (en) | 2021-02-02 |
| CN112305299B true CN112305299B (en) | 2021-11-12 |
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| CN102707127A (en) * | 2012-05-29 | 2012-10-03 | 长沙奥托自动化技术有限公司 | Simplified type alternating-current zero-crossing detecting and amplitude value sampling unit |
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| CN204116439U (en) * | 2014-07-29 | 2015-01-21 | 深圳信息职业技术学院 | An AC detection circuit and an AC detection device |
| CN204347110U (en) * | 2014-12-31 | 2015-05-20 | 广东易事特电源股份有限公司 | A kind of alternating current sample circuit |
| CN105652077A (en) * | 2015-12-30 | 2016-06-08 | 天津诚电科技有限公司 | Current testing instrument |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111327186A (en) * | 2020-03-23 | 2020-06-23 | 上海空间电源研究所 | A zero-crossing detection method of inductor current for bridgeless power factor correction circuit |
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2020
- 2020-10-19 CN CN202011119583.1A patent/CN112305299B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102707127A (en) * | 2012-05-29 | 2012-10-03 | 长沙奥托自动化技术有限公司 | Simplified type alternating-current zero-crossing detecting and amplitude value sampling unit |
| CN202600040U (en) * | 2012-05-29 | 2012-12-12 | 长沙奥托自动化技术有限公司 | Simplified alternating-current zero crossing point detecting and amplitude sampling device |
| CN104049143A (en) * | 2014-06-19 | 2014-09-17 | 合肥荣事达三洋电器股份有限公司 | Commercial power detection device and detection method |
| CN204008849U (en) * | 2014-06-19 | 2014-12-10 | 合肥荣事达三洋电器股份有限公司 | Commercial power detection device |
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| CN105652077A (en) * | 2015-12-30 | 2016-06-08 | 天津诚电科技有限公司 | Current testing instrument |
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