CN211374874U - Wearable equipment current detection circuit and wearable equipment - Google Patents
Wearable equipment current detection circuit and wearable equipment Download PDFInfo
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- CN211374874U CN211374874U CN201922380895.7U CN201922380895U CN211374874U CN 211374874 U CN211374874 U CN 211374874U CN 201922380895 U CN201922380895 U CN 201922380895U CN 211374874 U CN211374874 U CN 211374874U
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- current detection
- wearable device
- power supply
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Abstract
The utility model provides a wearable equipment current detection circuit, include: a printed circuit board integrated with a system on a chip; further comprising: the testing resistor is composed of a part of a printed line of the printed circuit board and is used for converting a working current signal into a working voltage signal; and the electricity meter chip is used for detecting the working voltage signal of the test resistor, one path of pin of the electricity meter chip is connected with the test resistor through a measuring point positive electrode signal line, and the other path of pin of the electricity meter chip is connected with the test resistor through a measuring point negative electrode signal line. A wearable device is also provided. The utility model discloses an do not need the extra external sampling resistance of overall arrangement among the wearable equipment, optimized inside overall arrangement when realizing current detection, more accord with the design demand of wearable equipment.
Description
Technical Field
The utility model relates to an electronic equipment technical field especially relates to a wearable equipment current detection circuit to and a wearable equipment.
Background
Wearable equipment is the portable accessory that possesses partial calculation function, joinable smart mobile phone and all kinds of terminals, including intelligent wrist-watch and the intelligent wrist strap that uses the wrist as the support, foot ring, shoes and socks that use the foot as the support, intelligent glasses, intelligent helmet and the intelligent bandeau that use the head as the support to and wear the intelligent ring at the hand, in addition intelligent clothing, schoolbag, walking stick and other accessories etc..
Generally, a current test of a PCB (printed circuit board) used in a wearable device requires an additional sampling resistor to be connected in series in a power circuit, and an operating current is calculated by testing a voltage difference between two ends of the sampling resistor. However, for some wearable devices, such as smart rings, the product size and size are very small, and there is often no space for placing a sampling resistor in the circuit layout, which makes the current testing very difficult.
Disclosure of Invention
The utility model aims at designing a wearable equipment current detection circuit to solve the wearable equipment inner space undersize of part among the prior art, can't set up sampling resistance during circuit layout, the inconvenient problem of current detection.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:
a wearable device current detection circuit, comprising: a printed circuit board integrated with a system on a chip; further comprising: the testing resistor is composed of a part of a printed line of the printed circuit board and is used for converting a working current signal into a working voltage signal; and the electricity meter chip is used for detecting the working voltage signal of the test resistor, one path of pin of the electricity meter chip is connected with the test resistor through a measuring point positive electrode signal line, and the other path of pin of the electricity meter chip is connected with the test resistor through a measuring point negative electrode signal line.
Further, the test resistor has a set resistance value; the size of the test resistor satisfies: the ratio of the length of the test resistor to the cross-sectional area of the test resistor is equal to the ratio of the set resistance value to the resistivity of the printed line of the printed circuit board.
Preferably, the printed circuit board is of a laminated structure, and the printed lines of the printed circuit board are copper foils.
Preferably, the length of the test resistor is 3mm, the width of the test resistor is 0.21mm, and the thickness of the test resistor is 0.025 mm.
Further, the method also comprises the following steps: a power supply for supplying power to the wearable device; the system on a chip includes: a power supply circuit; one end of a printed line of the printed circuit board provided with the test resistor is connected with the power supply circuit, and the other end of the printed line is connected with the power supply.
Further, the printed wiring of the printed circuit board includes: one end of the test resistor is connected with the power circuit through the first power lead; and the other end of the test resistor is connected with the anode of the power supply or the cathode of the power supply through a second power supply lead.
In order to ensure normal power supply and heat dissipation, the width of the first power supply lead and the second power supply lead is larger than that of the test resistor.
Further, the power supply is a battery, and the anode or the cathode of the battery is welded on the second power supply lead.
Further, the system on chip includes: and the processing chip receives the working voltage signal of the test resistor output by the fuel gauge chip, and generates and outputs a working current signal of the test resistor.
Another aspect of the utility model provides a wearable device, including the current detection circuit, the current detection circuit includes: a printed circuit board integrated with a system on a chip; further comprising: the testing resistor is composed of a part of a printed line of the printed circuit board and is used for converting a working current signal into a working voltage signal; and the electricity meter chip is used for detecting the working voltage signal of the test resistor, one path of pin of the electricity meter chip is connected with the test resistor through a measuring point positive electrode signal line, and the other path of pin of the electricity meter chip is connected with the test resistor through a measuring point negative electrode signal line.
By adopting the circuit structure, the coulometer chip can obtain the working voltage at two ends of the test resistor through sampling of the positive signal line and the negative signal line of the measurement point, and further obtain the working current of the test resistor according to the ohm theorem through the voltage difference at the two ends and the set resistance value of the test resistor. The wearable device does not need to be externally provided with sampling resistors, the internal layout is optimized while the current detection is realized, and the design requirement of the wearable device is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic block diagram of a circuit of a wearable device current detection circuit disclosed in the present invention;
FIG. 2 is a schematic diagram of a test resistor in the current detection circuit shown in FIG. 1;
fig. 3 is a circuit connection diagram of the current detection circuit shown in fig. 1.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In order to solve the problems that the internal space of part of wearable equipment in the prior art is too small, an external sampling resistor cannot be arranged during circuit layout, and current detection is inconvenient, a schematic block diagram of a circuit principle of a newly designed wearable equipment current detection circuit is shown in fig. 1. Specifically, the current detection circuit 1 is mainly constituted by a printed circuit board 10 integrated with a system on chip (SoC) 11. Unlike the structure in which the external sampling resistor is laid out, in the present embodiment, the sampling resistor is simulated using the direct current resistance of the printed wiring of the printed circuit board 10 itself. Specifically, the current detection circuit 1 includes a test resistor 12, and the test resistor 12 is formed by a portion of a track of the printed circuit board 10, as shown by R104 in fig. 1. The test resistor 12 is used to convert the operating current signal into a detectable operating voltage signal when performing a current test. On the other hand, the operating voltage signal of the test resistor 12 is detected by the fuel gauge chip 13. One path of the pins of the fuel gauge chip 13 is connected to the test resistor 12 through the measurement point positive signal line CSP, and the other path of the pins of the fuel gauge chip 13 is connected to the test resistor 12 through the measurement point negative signal line CSN. By adopting the circuit structure, the coulometer chip 13 can sample the working voltage at the two ends of the test resistor 12 through the measurement point positive signal line CSP and the measurement point negative signal line CSN, and further obtain the working current of the test resistor 12 according to the ohm theorem through the voltage difference at the two ends and the set resistance of the test resistor 12. Preferably, the processing chip of the system-on-chip 11 generates the operating current of the test resistor 12, and the processing chip receives the operating voltage signal of the test resistor 12 output by the fuel gauge chip 13, and generates and outputs an operating current signal of the test resistor 12. The processing chip can be an MCU of the wearable device, and can also be an independent integrated chip with an I/O interface.
Referring to fig. 2, the test resistor 12 has a set resistance value R (which may be set to 0.01Ohm as shown in fig. 1), and the set resistance value R is determined by the physical form of the test resistor 12, that is, the size of the set resistance value R is such that the ratio of the length L of the test resistor 12 to the cross-sectional area S of the test resistor 12 is equal to the ratio of the set resistance value R to the resistivity ρ of the printed line of the printed circuit board 10. As shown in fig. 2, where L is the length of the test resistor 12, W is the width of the test resistor 12, and T is the thickness of the test resistor 12. The printed circuit board 10 is preferably designed as a laminate structure, the tracks of the printed circuit board 10 being copper foils, i.e. the test resistors 12 being part of the copper foils. Preferably, the resistance of the test resistor 12 is set to be the same as that of the external sampling resistor, i.e., 0.01 Ω, and the resistivity ρ =1.75 × 10^ (-8) Ω m of the copper foil. That is, it can be obtained that the length of the test resistor 12 is designed to be 3mm, the width of the test resistor 12 is 0.21mm, and the thickness of the test resistor 12 is 0.025 mm. It will be understood by those skilled in the art that the length, width and thickness of the test resistor 12 may be designed to other parameters, provided that the ratio of the length of the test resistor 12 to the cross-sectional area of the test resistor 12 is equal to the ratio of the set resistance to the resistivity of the tracks of the printed circuit board 10.
Considering that the current test is mainly applied at the power supply terminal, the current detection circuit 1 further includes a power supply 14. The power supply 14 supplies power to the wearable device. As shown in fig. 1 and 3, the power supply 14 may be a battery of different types, and the specific structure of the battery is not limited herein. The system-on-chip 11 includes a power supply circuit 15 matched to the power supply 14. As shown in fig. 3, in a specific circuit layout, one end of a track of the printed circuit board 10 provided with the test resistor 12 is connected to the power supply circuit 15, and the other end is connected to the power supply 14. In order to prevent the positive signal line CSP or the negative signal line CSN from collecting other copper foils than the test resistor 12, the printed circuit board 10 has a first power lead 16 and a second power lead 17, one end of the test resistor 12 is connected to the power circuit 15 through the first power lead 16, and the other end of the test resistor 12 is connected to the positive or negative electrode of the power supply 14, i.e., the positive or negative electrode of the battery, through the second power lead 17. The specific arrangement of the positive electrode or the negative electrode of the battery is determined according to the model of the selected electricity meter chip 13. The width of the first power supply lead 16 and the second power supply lead 17 is preferably greater than the width of the test resistor 12 to ensure normal power supply and heat dissipation requirements. The positive or negative electrode of the battery is welded to the second power supply lead 17 via the battery pad 18. The positive signal line CSP of the measuring point or the negative signal line CSN of the measuring point is led out from two ends of the testing resistor 12, so that the measuring error caused by other printed lines is reduced as much as possible.
Another aspect of the present invention provides a wearable device. The wearable device is provided with a current detection circuit. The current detection circuit includes a printed circuit board integrated with a system on a chip of the wearable device. The testing resistor is used for converting the working current signal into the working voltage signal. The current detection circuit further includes a fuel gauge chip. The electric quantity meter chip is used for detecting working voltage signals of the test resistor, one path of pin of the electric quantity meter chip is connected with the test resistor through a measuring point anode signal line, and the other path of pin of the electric quantity meter chip is connected with the test resistor through a measuring point cathode signal line. The wearable device adopts the circuit structure, the coulometer chip can obtain the working voltage at two ends of the test resistor through the sampling of the positive signal line and the negative signal line of the measurement point, and further obtain the working current of the test resistor according to the ohm theorem through the pressure difference at the two ends and the set resistance value of the test resistor. The wearable device does not need to be externally provided with sampling resistors, the internal layout is optimized while the current detection is realized, and the design requirement of the wearable device is met. It should be noted that the wearable device in this embodiment refers to a portable electronic accessory that has a part of computing function and can be connected to only a mobile phone and various terminals, including but not limited to a smart watch, a smart wristband, a smart foot ring, smart eyes, a smart helmet, a smart headband, a smart ring, and other accessories such as smart clothing, a bag, and a crutch.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A wearable device current detection circuit, comprising: a printed circuit board integrated with a system on a chip; the method is characterized in that:
further comprising:
the testing resistor is composed of a part of a printed line of the printed circuit board and is used for converting a working current signal into a working voltage signal; and
the electric quantity meter chip is used for detecting the working voltage signal of the test resistor, one path of pin of the electric quantity meter chip is connected with the test resistor through a measuring point positive electrode signal line, and the other path of pin of the electric quantity meter chip is connected with the test resistor through a measuring point negative electrode signal line.
2. The wearable device current detection circuit of claim 1,
the test resistor has a set resistance value;
the size of the test resistor satisfies: the ratio of the length of the test resistor to the cross-sectional area of the test resistor is equal to the ratio of the set resistance value to the resistivity of the printed line of the printed circuit board.
3. The wearable device current detection circuit of claim 2,
the printed circuit board is of a laminated structure, and the printed line of the printed circuit board is copper foil.
4. The wearable device current detection circuit of claim 3,
the length of test resistance is 3mm, the width of test resistance is 0.21mm, the thickness of test resistance is 0.025 mm.
5. The wearable device current detection circuit of any of claims 1 to 4,
it is characterized by also comprising:
a power supply for supplying power to the wearable device;
the system on a chip includes:
a power supply circuit;
one end of a printed line of the printed circuit board provided with the test resistor is connected with the power supply circuit, and the other end of the printed line is connected with the power supply.
6. The wearable device current detection circuit of claim 5, wherein the printed circuit board traces comprise:
one end of the test resistor is connected with the power circuit through the first power lead; and
and the other end of the test resistor is connected with the anode of the power supply or the cathode of the power supply through a second power lead.
7. The wearable device current detection circuit of claim 6,
the width of the first power supply lead and the second power supply lead is larger than the width of the test resistor.
8. The wearable device current detection circuit of claim 7,
the power supply is a battery, and the anode or the cathode of the battery is welded on the second power supply lead.
9. The wearable device current detection circuit of claim 8,
the system on a chip includes:
and the processing chip receives the working voltage signal of the test resistor output by the fuel gauge chip, and generates and outputs a working current signal of the test resistor.
10. A wearable device comprising the wearable device current detection circuit of any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922380895.7U CN211374874U (en) | 2019-12-26 | 2019-12-26 | Wearable equipment current detection circuit and wearable equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922380895.7U CN211374874U (en) | 2019-12-26 | 2019-12-26 | Wearable equipment current detection circuit and wearable equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211374874U true CN211374874U (en) | 2020-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922380895.7U Active CN211374874U (en) | 2019-12-26 | 2019-12-26 | Wearable equipment current detection circuit and wearable equipment |
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| Country | Link |
|---|---|
| CN (1) | CN211374874U (en) |
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- 2019-12-26 CN CN201922380895.7U patent/CN211374874U/en active Active
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