CN210347751U - Current stepping measuring circuit - Google Patents
Current stepping measuring circuit Download PDFInfo
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- CN210347751U CN210347751U CN201920941112.5U CN201920941112U CN210347751U CN 210347751 U CN210347751 U CN 210347751U CN 201920941112 U CN201920941112 U CN 201920941112U CN 210347751 U CN210347751 U CN 210347751U
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Abstract
A current step measurement circuit comprising: the device comprises a controller, a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3 and a fourth MOS transistor Q4; the controller is respectively connected with the grid electrode of the first MOS transistor Q1, the grid electrode of the second MOS transistor Q2, the grid electrode of the third MOS transistor Q3 and the grid electrode of the fourth MOS transistor Q4. The drain electrode of the first MOS transistor Q1 is connected with the source electrode of the second MOS transistor Q2, and the drain electrode of the third MOS transistor Q3 is connected with the source electrode of the fourth MOS transistor Q4; the source electrode of the first MOS transistor Q1 is connected with the anode of the battery, and the source electrode of the third MOS transistor Q3 is also connected with the anode of the battery; the drain electrode of the second MOS tube Q2 is connected with a first current sensor (I-1), and the drain electrode of the fourth MOS tube Q4 is connected with a second current sensor (I-2). A load is also connected between the first current sensor and the negative electrode of the battery. For current single range precision scheme, the utility model discloses can improve undercurrent measurement precision by a wide margin.
Description
Technical Field
The utility model belongs to the technical field of power electronics, concretely relates to electric current stepping measuring circuit.
Background
The current testing precision of the existing battery testing equipment is full-scale precision, the requirements of large current range and small current high measuring precision cannot be met simultaneously, the small current measuring precision is sacrificed when the large current range is needed, and the large current measuring range is sacrificed when the small current measuring precision is high.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is realized through the following technical scheme.
The utility model discloses a current stepping measuring circuit can realize big current measurement range to compromise the undercurrent measurement precision, but 2 current measurement gears seamless switching.
Specifically, a current stepping measurement circuit includes: the MOS transistor comprises a controller, a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor; the controller is respectively connected with the grid electrode of the first MOS tube, the grid electrode of the second MOS tube, the grid electrode of the third MOS tube and the grid electrode of the fourth MOS tube; the drain electrode of the first MOS tube is connected with the source electrode of the second MOS tube, and the drain electrode of the third MOS tube is connected with the source electrode of the fourth MOS tube.
Further, the current stepping measuring circuit further comprises a battery, the source electrode of the first MOS tube is connected with the anode of the battery, and the source electrode of the third MOS tube is also connected with the anode of the battery.
Further, the current stepping measuring circuit further comprises a first current sensor and a second current sensor, the drain of the second MOS transistor is connected with the first current sensor, and the drain of the fourth MOS transistor Q4 is connected with the second current sensor.
Further, a load is connected between the first current sensor and the negative electrode of the battery.
Further, the controller adopts a Microcontroller (MCU).
Further, when the current detected by the first current sensor is smaller than the small current range, the microcontroller controls the range selection signal to be 0, the third MOS tube and the fourth MOS tube are connected, the first MOS tube and the second MOS tube are disconnected, and the current measurement is carried out through the second current sensor.
Further, when the current detected by the first current sensor is larger than the small current range, the microcontroller controls the range selection signal to be 1, the first MOS tube and the second MOS tube are connected, the third MOS tube and the fourth MOS tube are disconnected, and the current is measured through the first current sensor.
The utility model has the advantages that: compared with the existing single-range precision scheme, the current measurement precision can be greatly improved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a current stepping measurement circuit according to an embodiment of the present invention.
Fig. 2 shows a MCU control flow chart according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The utility model discloses a stepping current measurement both can satisfy big electric current range, can compromise little current measurement precision again, but 2 individual gears seamless switch, realized the heavy current range and compromise little current measurement precision, increased substantially current measurement precision.
As shown in fig. 1, the utility model comprises: the device comprises a controller, a first MOS transistor Q1, a second MOS transistor Q2, a third MOS transistor Q3 and a fourth MOS transistor Q4; the controller is respectively connected with the grid electrode of the first MOS transistor Q1, the grid electrode of the second MOS transistor Q2, the grid electrode of the third MOS transistor Q3 and the grid electrode of the fourth MOS transistor Q4. The drain electrode of the first MOS transistor Q1 is connected with the source electrode of the second MOS transistor Q2, and the drain electrode of the third MOS transistor Q3 is connected with the source electrode of the fourth MOS transistor Q4; the source electrode of the first MOS transistor Q1 is connected with the anode of the battery, and the source electrode of the third MOS transistor Q3 is also connected with the anode of the battery; the drain electrode of the second MOS tube Q2 is connected with a first current sensor (I-1), and the drain electrode of the fourth MOS tube Q4 is connected with a second current sensor (I-2). A load is also connected between the first current sensor and the negative electrode of the battery.
Q1/Q2 is an MOS tube; Q1/Q2 form a high current span channel switch.
Q3/Q4 is an MOS tube; Q3/Q4 form a small current span channel switch.
I-1 is a large current sensor for measuring large current.
I-2 is a small current sensor for measuring small current.
The measuring range is selected by a controller, and Q1/Q2 is conducted when the measuring range is defaulted to 1, so that large current is measured; at 0, Q3/Q4 was turned on and a small current was measured.
The controller of the utility model can adopt a Microcontroller (MCU). The MCU control flow is shown in FIG. 2: the MCU detects a current signal I-1 after the system is electrified, when the current is smaller than the small current range, the range selection signal is controlled to be 0, Q3/Q4 is switched on immediately, Q1/Q2 is switched off slowly, and the current is measured through the small current sensor I-2, so that the seamless switching of the small current range is realized.
The MCU detects a current signal I-1, when the current is larger than the small current range, the range selection signal is controlled to be 1, Q1/Q2 is switched on immediately, Q3/Q4 is switched off slowly, and the current is measured through the large current sensor I-1, so that seamless switching of a large current range is realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A current step measurement circuit, comprising: the MOS transistor comprises a controller, a first MOS transistor, a second MOS transistor, a third MOS transistor and a fourth MOS transistor; the controller is respectively connected with the grid electrode of the first MOS tube, the grid electrode of the second MOS tube, the grid electrode of the third MOS tube and the grid electrode of the fourth MOS tube; the drain electrode of the first MOS tube is connected with the source electrode of the second MOS tube, and the drain electrode of the third MOS tube is connected with the source electrode of the fourth MOS tube.
2. A current-stepping measurement circuit according to claim 1,
the current grading measurement circuit further comprises a battery, the source electrode of the first MOS tube is connected with the anode of the battery, and the source electrode of the third MOS tube is also connected with the anode of the battery.
3. A current-stepping measurement circuit according to claim 2,
the current stepping measuring circuit further comprises a first current sensor and a second current sensor, the drain electrode of the second MOS tube is connected with the first current sensor, and the drain electrode of the fourth MOS tube Q4 is connected with the second current sensor.
4. A current step measurement circuit according to claim 3,
and a load is also connected between the first current sensor and the negative electrode of the battery.
5. A current-stepping measurement circuit according to claim 4,
the controller adopts a Microcontroller (MCU).
6. A current step measurement circuit according to claim 5,
when the current detected by the first current sensor is smaller than the small current range, the microcontroller controls the range selection signal to be 0, the third MOS tube and the fourth MOS tube are conducted, the first MOS tube and the second MOS tube are disconnected, and the current is measured through the second current sensor.
7. A current step measurement circuit according to claim 5,
when the current detected by the first current sensor is larger than the small current range, the microcontroller controls the range selection signal to be 1, the first MOS tube and the second MOS tube are conducted, the third MOS tube and the fourth MOS tube are disconnected, and the current is measured through the first current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920941112.5U CN210347751U (en) | 2019-06-21 | 2019-06-21 | Current stepping measuring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920941112.5U CN210347751U (en) | 2019-06-21 | 2019-06-21 | Current stepping measuring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210347751U true CN210347751U (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920941112.5U Active CN210347751U (en) | 2019-06-21 | 2019-06-21 | Current stepping measuring circuit |
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| CN (1) | CN210347751U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114720897A (en) * | 2022-02-28 | 2022-07-08 | 福建星云检测技术有限公司 | Battery testing method and system with automatic current grading function |
-
2019
- 2019-06-21 CN CN201920941112.5U patent/CN210347751U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114720897A (en) * | 2022-02-28 | 2022-07-08 | 福建星云检测技术有限公司 | Battery testing method and system with automatic current grading function |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 4th Floor, Block A, Incubation Building, No. 7 Fengxian Middle Road, Haidian District, Beijing 100094 Patentee after: Beijing Suoying Electric Technology Co.,Ltd. Address before: 100094 floor 5, block a, modern enterprise accelerator (zone 1), Yongfeng Industrial base, Haidian District, Beijing Patentee before: BEIJING SOARING ELECTRIC TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address |