CN215953726U - Switching system based on measurement channel of metering chip - Google Patents
Switching system based on measurement channel of metering chip Download PDFInfo
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- CN215953726U CN215953726U CN202122390224.6U CN202122390224U CN215953726U CN 215953726 U CN215953726 U CN 215953726U CN 202122390224 U CN202122390224 U CN 202122390224U CN 215953726 U CN215953726 U CN 215953726U
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Abstract
The utility model relates to a switching system based on a measurement channel of a metering chip, which comprises an MCU unit, a metering chip unit, a voltage sampling unit, a current sampling unit and a phase sequence adjusting unit, wherein the MCU unit is used for acquiring a phase sequence of a current; the MCU unit and the metering chip unit are in data communication in an SPI mode; the MCU is also connected with a phase sequence adjusting unit, and the phase sequence adjusting unit carries out corresponding phase sequence adjustment according to a phase sequence adjusting command from the MCU; the phase sequence adjusting unit and the current sampling unit are connected with the metering chip unit; the voltage sampling unit is connected with the phase sequence adjusting unit, and converts the electric network strong electric signals into voltage signals within the sampling range of the metering chip unit and is connected into the phase sequence adjusting unit. The utility model realizes the physical switching of the channels by the designed sampling channel switching circuit to achieve the purpose of allowable adjustment on the premise of ensuring the high-precision measurement of the metering chip.
Description
Technical Field
The utility model relates to the technical field of metering chips, in particular to a switching system based on a metering chip measuring channel.
Background
With the rapid development of the semiconductor chip industry, the traditional mechanical electric energy meter has been gradually replaced by an electronic electric energy meter loaded with a special metering chip. The meter using the special metering chip has high precision and high reliability and is favored by the power supply and distribution industries of various industries. However, each sampling channel of the metering chip must be connected to a fixed power grid phase sequence to ensure the accuracy of measurement (the uniqueness of wiring, the metering chip itself cannot realize the switching of the channels), and if the phase sequence is connected in error (a voltage or current channel), the accurate measurement can be realized only after the physical wiring adjustment is performed by power failure.
The requirement on the field wiring of a user is high, and in the occasion of wiring error, the enterprise production is influenced by a power failure adjusting line, and the production life is influenced by power failure in public occasions and the like; even in some special occasions, the equipment cannot be powered off to adjust wiring, and the hot-line operation of workers is extremely dangerous.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects and provide a switching system based on a measuring channel of a measuring chip, which achieves the purpose of allowable adjustment by realizing the physical switching of the channel through a designed sampling channel switching circuit on the premise of ensuring the high-precision measurement of the measuring chip.
The purpose of the utility model is realized as follows:
a switching system based on a measurement channel of a metering chip comprises an MCU unit, a metering chip unit, a voltage sampling unit, a current sampling unit and a phase sequence adjusting unit; the MCU unit and the metering chip unit are in data communication in an SPI mode; the MCU is also connected with a phase sequence adjusting unit, and the phase sequence adjusting unit carries out corresponding phase sequence adjustment according to a phase sequence adjusting command from the MCU; the phase sequence adjusting unit and the current sampling unit are connected with the metering chip unit, and the current collecting unit converts a large power grid current signal or a secondary signal of the power transformer into a voltage signal within the sampling range of the metering chip unit; the voltage sampling unit is connected with the phase sequence adjusting unit, and converts the electric network strong electric signals into voltage signals within the sampling range of the metering chip unit and is connected into the phase sequence adjusting unit.
Further, the phase sequence adjustment unit includes three independent analog switch channels: the first switch, the second switch and the third switch are independently controlled by the MCU.
Further, the three voltage sampling signals of the voltage sampling unit are: the first sampling channel, the second sampling channel and the third sampling channel are respectively connected in parallel to the three analog switch channels of the phase sequence adjusting unit.
Further, a zero signal channel is arranged at the switching input between the voltage sampling signal and the analog switch channel and serves as a switching middle channel.
Furthermore, the first switch is connected with a UA voltage communication signal, and the UA voltage communication signal keeps in phase with the IA channel of the metering chip; the second switch is connected with a UB voltage communication signal, and the UB voltage communication signal keeps the same phase with the IB channel of the metering chip; the third switch is connected with a UC voltage communication signal, and the UC voltage communication signal keeps the same phase with the IC channel of the metering chip; three voltage sampling signals of the voltage sampling unit: the first sampling channel, the second sampling channel and the third sampling channel are respectively connected in parallel to three independent analog switch channels of the phase sequence adjusting unit.
Furthermore, the three analog switch channels of the phase sequence adjusting unit are all implemented by the single-pole double-throw analog switch 74HC 4052.
Compared with the prior art, the utility model has the beneficial effects that:
(1) on the premise of ensuring high-precision measurement of a metering chip, the utility model realizes physical switching of channels by a designed sampling channel switching circuit to achieve the purpose of phase sequence adjustment; the problem that the switching of a measurement sampling channel cannot be realized by the conventional metering chip technology is solved;
(2) the switching of the measuring channels of the utility model adopts the MCU digital control mode, does not adopt a mechanical switch, does not need the field operation of personnel, and has higher safety in remote operation. The intelligent adjustment of phase sequence wiring can be realized by using control software of corresponding products, so that the labor is reduced, the cost is saved, and the specialty of product installation is reduced;
(3) the switching circuit is provided with a switching intermediate channel (zero signal channel), so that signal collision in the channel switching process is prevented, and abnormal chip measurement is prevented.
Drawings
Fig. 1 is a schematic structural diagram of a switching system according to the present invention.
Fig. 2 is a schematic diagram of a phase sequence adjusting unit according to the present invention.
Fig. 3 is a schematic circuit diagram of the phase sequence adjusting circuit of the present invention.
Wherein:
the device comprises an MCU unit 1, a metering chip unit 2, a voltage sampling unit 3, a current sampling unit 4 and a phase sequence adjusting unit 5.
Detailed Description
For a better understanding of the technical aspects of the present invention, reference will now be made in detail to the accompanying drawings. It should be understood that the following specific examples are not intended to limit the embodiments of the present invention, but are merely exemplary embodiments of the present invention. It should be noted that the description of the positional relationship of the components, such as the component a is located above the component B, is based on the description of the relative positions of the components in the drawings, and is not intended to limit the actual positional relationship of the components.
Example 1:
referring to fig. 1-3, fig. 1 depicts a schematic diagram of the switching system of the present invention. As shown in the figure, the switching system based on the measurement channel of the metering chip comprises an MCU unit 1, a metering chip unit 2, a voltage sampling unit 3, a current sampling unit 4 and a phase sequence adjusting unit 5.
And the MCU unit 1 and the metering chip unit 2 carry out data communication in an SPI mode.
The MCU unit 1 is also connected with a phase sequence adjusting unit 5, and the phase sequence adjusting unit 5 performs corresponding phase sequence adjustment according to a phase sequence adjusting command from the MCU unit 1.
The phase sequence adjusting unit 5 and the current sampling unit 4 are connected with the metering chip unit 2, and the current collecting unit 4 converts a large power grid current signal or a secondary signal of the power transformer into a voltage signal within the sampling range of the metering chip unit 2.
The voltage sampling unit 3 is connected with the phase sequence adjusting unit 5, and the voltage sampling unit 3 converts the electric network strong electric signal into a voltage signal within the sampling range of the metering chip unit 1 and is connected to the phase sequence adjusting unit 5.
Referring to fig. 2, fig. 2 depicts a schematic diagram of the phase sequence adjustment unit of the present invention. As shown in the figure, the phase sequence adjusting method of the switching system based on the measurement channel of the metering chip, which is related by the utility model, comprises a phase sequence adjusting unit 5, wherein the phase sequence adjusting unit 5 is connected between a voltage sampling unit 3 and a metering chip unit 2 and is connected to an MCU unit 1.
The phase sequence adjustment unit 5 includes three analog switch channels: the three switches are independently controlled by the MCU unit 1, the first switch is connected with a UA voltage communication signal, and the UA voltage communication signal keeps in phase with an IA channel of the metering chip; the second switch is connected with a UB voltage communication signal, and the UB voltage communication signal keeps the same phase with the IB channel of the metering chip; the third switch connects the UC voltage communication signal, which remains in phase with the metering chip IC channel.
Three voltage sampling signals of the voltage sampling unit 3: the first sampling channel, the second sampling channel and the third sampling channel are respectively connected in parallel to three independent analog switch channels of the phase sequence adjusting unit 5.
A zero signal channel is arranged at the switching input between the voltage sampling signal and the analog switch channel and serves as a switching intermediate channel, and therefore the situation that signals of three paths of voltage sampling signals conflict and influence in the switching process, so that the metering chip is abnormal and data judgment is influenced is prevented.
The three analog switch channels of the phase sequence adjusting unit 5 are all implemented by the single-pole double-throw analog switch 74HC 4052.
The utility model achieves the purpose of measuring the phase sequence adjustment of the chip by switching the voltage channel, and equivalently, the utility model can derive the fixed voltage channel and realize the phase sequence adjustment by switching the current channel.
The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (6)
1. The utility model provides a switching system based on measurement of chip passageway which characterized in that: the device comprises an MCU unit, a metering chip unit, a voltage sampling unit, a current sampling unit and a phase sequence adjusting unit; the MCU unit and the metering chip unit are in data communication in an SPI mode; the MCU is also connected with a phase sequence adjusting unit, and the phase sequence adjusting unit carries out corresponding phase sequence adjustment according to a phase sequence adjusting command from the MCU; the phase sequence adjusting unit and the current sampling unit are connected with the metering chip unit, and the current collecting unit converts a large power grid current signal or a secondary signal of the power transformer into a voltage signal within the sampling range of the metering chip unit; the voltage sampling unit is connected with the phase sequence adjusting unit, and converts the electric network strong electric signals into voltage signals within the sampling range of the metering chip unit and is connected into the phase sequence adjusting unit.
2. The switching system based on the measurement channel of the metering chip as claimed in claim 1, wherein: the phase sequence adjustment unit comprises three independent analog switch channels: the first switch, the second switch and the third switch are independently controlled by the MCU.
3. The switching system based on the measurement channel of the metering chip as claimed in claim 1, wherein: three voltage sampling signals of the voltage sampling unit: the first sampling channel, the second sampling channel and the third sampling channel are respectively connected in parallel to the three analog switch channels of the phase sequence adjusting unit.
4. The switching system based on the measurement channel of the metering chip as claimed in claim 1, wherein: and a zero signal channel is arranged at the switching input between the voltage sampling signal and the analog switch channel and is used as a switching middle channel.
5. The switching system based on the measurement channel of the metering chip as claimed in claim 2, wherein: the first switch is connected with a UA voltage communication signal, and the UA voltage communication signal keeps the same phase with an IA channel of the metering chip; the second switch is connected with a UB voltage communication signal, and the UB voltage communication signal keeps the same phase with the IB channel of the metering chip; the third switch is connected with a UC voltage communication signal, and the UC voltage communication signal keeps the same phase with the IC channel of the metering chip; three voltage sampling signals of the voltage sampling unit: the first sampling channel, the second sampling channel and the third sampling channel are respectively connected in parallel to three independent analog switch channels of the phase sequence adjusting unit.
6. The switching system based on the measurement channel of the metering chip as claimed in claim 2, wherein: and the three analog switch channels of the phase sequence adjusting unit are all functionally realized by adopting a single-pole double-throw analog switch 74HC 4052.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122390224.6U CN215953726U (en) | 2021-09-30 | 2021-09-30 | Switching system based on measurement channel of metering chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122390224.6U CN215953726U (en) | 2021-09-30 | 2021-09-30 | Switching system based on measurement channel of metering chip |
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| CN215953726U true CN215953726U (en) | 2022-03-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671248A (en) * | 2021-09-30 | 2021-11-19 | 江苏安科瑞电器制造有限公司 | Switching system based on measurement channel of metering chip and phase sequence adjusting method thereof |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113671248A (en) * | 2021-09-30 | 2021-11-19 | 江苏安科瑞电器制造有限公司 | Switching system based on measurement channel of metering chip and phase sequence adjusting method thereof |
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