CN113391117A - Real-time power consumption calculation circuit and method for lithium battery of electromagnetic water meter - Google Patents
Real-time power consumption calculation circuit and method for lithium battery of electromagnetic water meter Download PDFInfo
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 78
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- G—PHYSICS
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Abstract
The invention discloses a real-time power consumption calculation circuit and a method for a lithium battery of an electromagnetic water meter, wherein the real-time power consumption calculation circuit for the lithium battery of the electromagnetic water meter comprises the following steps: the device comprises a working state time measuring unit, a real-time current detecting unit and a power consumption calculating unit; the working state time measuring unit is used for acquiring the time of the electromagnetic water meter in each working state; the real-time current detection unit is used for detecting real-time current so as to detect the current value of the electromagnetic water meter in each working state; the power consumption calculating unit is used for calculating the power consumption of the electromagnetic water meter in each working state and the accumulated power consumption in each working state. The invention can accurately detect the overall power consumption of the electromagnetic water meter in real time under the condition of using lower power consumption, know the power consumption condition of the lithium battery in time, find out the problem in time and solve the problem in time, and can send out power early warning in advance, replace the lithium battery in time and ensure the normal use of the electromagnetic water meter.
Description
Technical Field
The invention belongs to the technical field of measuring devices, relates to an electromagnetic water meter, and particularly relates to a circuit and a method for calculating real-time power consumption of a lithium battery of the electromagnetic water meter.
Background
At present, the state widely promotes the wisdom city, its wisdom water utilities is an important part in wisdom city, the basis of wisdom water utilities lies in collecting data, need install flow measuring instrument in a large number, on-the-spot flow measuring instrument's data is uploaded to wisdom water utilities platform, in time discover the pipe network leakage, in time repair pipe network leakage, can reduce the leakage loss volume by great degree, electromagnetic flowmeter and electromagnetic water meter are as a new technology, because its long-term measurement accuracy is high, the pressure loss is little, advantages such as long service life, gradually replace other flowmeters.
Because the electromagnetism water gauge is generally installed outdoors, the power supply is very inconvenient, basic electromagnetism water gauge all adopts the mode of lithium cell power supply, in order to guarantee the normal use of electromagnetism water gauge and in time change the lithium cell, so need monitor the power consumption of electromagnetism water gauge, in time discover the power consumption of electromagnetism water gauge unusual and accurately judge the lithium cell change time of electromagnetism water gauge, prior art all judges the remaining capacity of lithium cell through the voltage of lithium cell, because the lithium cell voltage of large capacity does not have accurate corresponding relation with the remaining capacity, so can't obtain actual remaining capacity through measuring lithium cell voltage, can only learn that the lithium cell does not have the electricity through the threshold value of a voltage, but in case the lithium cell has reached the threshold value, the capacity of general lithium cell can only maintain very short live time, come not to change the lithium cell in time.
In view of the above, there is an urgent need to design a way for managing the power consumption of an electromagnetic water meter so as to overcome the above-mentioned drawbacks of the existing electromagnetic water meters.
Disclosure of Invention
The invention provides a real-time power consumption calculation circuit and method for a lithium battery of an electromagnetic water meter, which can accurately detect the power consumption of the electromagnetic water meter in real time under the condition of using lower power consumption.
In order to solve the technical problem, according to one aspect of the present invention, the following technical solutions are adopted:
the utility model provides an electromagnetism water gauge lithium cell real-time power consumption calculation circuit, electromagnetism water gauge lithium cell real-time power consumption calculation circuit includes:
the working state time measuring unit is used for acquiring the time of the electromagnetic water meter in each working state;
the real-time current detection unit is used for detecting real-time current so as to detect the current value of the electromagnetic water meter in each working state; and
and the power consumption calculating unit is used for calculating the power consumption of the electromagnetic water meter in each working state and the accumulated power consumption in each working state.
As an embodiment of the present invention, the working states of the electromagnetic water meter include a sleep state, a measurement state, and a calibration state; the time measuring unit in the working state respectively obtains the time in each working state when the electromagnetic water meter is in a dormant state, a measuring state and a calibration state;
measuring current values under each working state according to the real-time current detection unit; and calculating the power consumption of each working state by the power consumption calculation unit, and accumulating the power consumption in all working states to obtain the accumulated real-time power consumption of the electromagnetic water meter.
As an embodiment of the present invention, the real-time power consumption calculation circuit of a lithium battery of an electromagnetic water meter further includes:
the local lithium battery power consumption icon and alarm display unit is used for displaying icons of lithium battery capacity reduction and alarm on a display screen of the electromagnetic water meter; and
and the remote transmission lithium battery power consumption icon and alarm information sending unit is used for sending a lithium battery residual capacity value and alarm information to the user system platform through the data remote transmission module of the electromagnetic water meter.
As an embodiment of the present invention, the real-time current detection circuit includes a first chip U1, a first connection port J1, a second connection port J2, a plurality of capacitors, and a plurality of resistors; the first chip U1 comprises a first pin IN + pin, a second pin VDD-pin, a third pin IN-pin, a fourth pin OUT pin and a fifth pin VDD + pin;
a first pin IN + of the first chip U1 is grounded through a third resistor R3, a second pin VDD-of the first chip U1 is connected with a first end of a second capacitor C2, and a second end of the second capacitor C2 is grounded;
a third pin IN-of the first chip U1 is respectively connected with a first end of a seventh resistor R7 and a first end of a sixth resistor R6; a fourth pin OUT of the first chip U1 is respectively connected with a second end of the sixth resistor R6 and a first end of the fourth resistor R4; a second end of the fourth resistor R4 is connected to a first end of the third capacitor C3 and a first end of the fifth resistor R5, respectively, a second end of the third capacitor C3 is grounded, and a second end of the fifth resistor R5 is grounded;
a fifth pin VDD + of the first chip U1 is connected with a first end of a first capacitor C1, and a second end of the first capacitor C1 is grounded;
the second end of the seventh resistor R7 is respectively connected with the first end of the first resistor R1, the second pin of the first connection port J1 and the battery cathode voltage VBAT-; the second end of the first resistor R1 and the second pin of the second connection port J2 are grounded respectively; the first pin of the first connection port J1 is connected to the battery positive voltage VBAT + and the first pin of the second connection port J2.
In one embodiment of the present invention, the battery negative voltage VBAT-is passed through the first resistor R1 to the ground AGND, and a slight voltage is obtained at the first resistor R1, and after being amplified by the first chip U1,
sampling is carried out for a very short time through ADC, and the sampled data is sent to the MCU for calculation to obtain the power consumption under the corresponding working state.
As an embodiment of the present invention, the power consumption calculation unit obtains the power consumption of the electromagnetic water meter in the corresponding working state through formula 1;
the power consumption calculation unit obtains the continuous accumulated power consumption of the electromagnetic water meter according to a formula 2;
the method comprises the steps of obtaining a power supply voltage, a power consumption value and a power consumption value of an electromagnetic water meter, wherein Pn is real-time power consumption In different states, In is instantaneous current In different states, Vn is power supply voltage, P is accumulated power consumption, and t is accumulated time of the electromagnetic water meter In corresponding working states.
As an embodiment of the present invention, the working state time measuring unit is configured to monitor a working state of the electromagnetic water meter in real time, and measure an accurate time of the working state in real time through a timer of the MCU.
A real-time power consumption calculation method for a lithium battery of an electromagnetic water meter comprises the following steps:
a working state time measuring step, namely respectively acquiring time in each working state when the electromagnetic water meter is in a dormant state, a measuring state and a calibration state;
a real-time current detection step, which is to measure the current value under each working state; and
and a power consumption calculating step, namely calculating the power consumption of each working state, and accumulating the power consumption in all the working states to obtain the accumulated real-time power consumption of the electromagnetic water meter.
As an embodiment of the present invention, the method for calculating the real-time power consumption of the lithium battery of the electromagnetic water meter further includes:
the method comprises the steps of local lithium battery power consumption icon and alarm display, wherein icons of lithium battery capacity reduction and alarm are displayed on a display screen of the electromagnetic water meter; and
and (3) sending the power consumption icon and alarm information of the remote transmission lithium battery, and sending the residual capacity value and the alarm information of the lithium battery to the user system platform through a data remote transmission module of the electromagnetic water meter.
In the step of calculating the power consumption, the power consumption of the electromagnetic water meter in the corresponding working state is obtained through a formula 1;
in the power consumption calculation step, the continuous accumulated power consumption of the electromagnetic water meter is obtained according to a formula 2;
the method comprises the steps of obtaining a power supply voltage, a power consumption value and a power consumption value of an electromagnetic water meter, wherein Pn is real-time power consumption In different states, In is instantaneous current In different states, Vn is power supply voltage, P is accumulated power consumption, and t is accumulated time of the electromagnetic water meter In corresponding working states.
The invention has the beneficial effects that: the circuit and the method for calculating the real-time power consumption of the lithium battery of the electromagnetic water meter can accurately detect the power consumption of the whole electromagnetic water meter in real time under the condition of using lower power consumption, know the power consumption condition of the lithium battery in time, find out the problem in time and solve the problem in time, and can send out power early warning in advance, replace the lithium battery in time and ensure the normal use of the electromagnetic water meter.
Drawings
Fig. 1 is a schematic composition diagram of a real-time power consumption calculation circuit for a lithium battery of an electromagnetic water meter according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a real-time current detection unit according to an embodiment of the invention.
Fig. 3 is a flowchart of a method for calculating real-time power consumption of a lithium battery of an electromagnetic water meter according to 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.
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. It is within the scope of the present disclosure and protection that the same or similar prior art means and some features of the embodiments may be interchanged.
The invention discloses a real-time power consumption calculation circuit of a lithium battery of an electromagnetic water meter, which comprises: the device comprises a working state time measuring unit 1, a real-time current detecting unit 2 and a power consumption calculating unit 3.
And the working state time measuring unit 1 is used for acquiring the time of the electromagnetic water meter in each working state. The real-time current detection unit 2 is used for detecting real-time current, so as to detect current values of the electromagnetic water meter in various working states. The power consumption calculating unit 3 is used for calculating the power consumption of the electromagnetic water meter in each working state and the accumulated power consumption in each working state.
In an embodiment of the present invention, the working states of the electromagnetic water meter include a sleep state, a measurement state, and a calibration state; and the time measuring unit 1 is used for acquiring the time of each working state when the electromagnetic water meter is in a dormant state, a measuring state and a calibration state respectively. Measuring current values under each working state according to the real-time current detection unit 2; and calculating the power consumption of each working state by the power consumption calculating unit 3, and accumulating the power consumption in all working states to obtain the accumulated real-time power consumption of the electromagnetic water meter.
In an embodiment of the present invention, the working state time measuring unit 1 is configured to monitor, in real time, a state of the electromagnetic water meter working in the above three states, and measure, in real time, an accurate time of the working state through a timer of the MCU.
FIG. 2 is a circuit diagram of a real-time current detection unit according to an embodiment of the present invention; referring to fig. 2, in an embodiment of the invention, the real-time current detection circuit includes a first chip U1, a first connection port J1, a second connection port J2, a plurality of capacitors and a plurality of resistors; the first chip U1 includes a first pin IN + pin, a second pin VDD-pin, a third pin IN-pin, a fourth pin OUT pin, and a fifth pin VDD + pin.
The pin IN + of the first chip U1 is grounded through a third resistor R3, the pin VDD-of the second pin of the first chip U1 is connected to the first end of a second capacitor C2, and the second end of the second capacitor C2 is grounded. A third pin IN-of the first chip U1 is respectively connected with a first end of a seventh resistor R7 and a first end of a sixth resistor R6; a fourth pin OUT of the first chip U1 is respectively connected with a second end of the sixth resistor R6 and a first end of the fourth resistor R4; the second end of the fourth resistor R4 is connected to the first end of the third capacitor C3 and the first end of the fifth resistor R5, respectively, the second end of the third capacitor C3 is grounded, and the second end of the fifth resistor R5 is grounded. The fifth pin VDD + of the first chip U1 is connected to the first end of the first capacitor C1, and the second end of the first capacitor C1 is grounded. The second end of the seventh resistor R7 is respectively connected with the first end of the first resistor R1, the second pin of the first connection port J1 and the battery cathode voltage VBAT-; the second end of the first resistor R1 and the second pin of the second connection port J2 are grounded respectively; the first pin of the first connection port J1 is connected to the battery positive voltage VBAT + and the first pin of the second connection port J2.
As shown in fig. 2, in an embodiment of the present invention, the battery negative voltage VBAT-passes through the first resistor R1 and then reaches the ground terminal AGND, a tiny voltage is obtained at the first resistor R1, amplified by the first chip U1, and then transmitted to the ADC analog-to-digital conversion circuit through the ILOAD-MCU interface, and the voltage transmitted by the ILOAD-MCU interface is sampled for a very short time through the ADC analog-to-digital conversion and then transmitted to the MCU for calculation, so as to obtain the power consumption under the corresponding working state.
In an embodiment of the present invention, the power consumption calculating unit 3 obtains the power consumption of the electromagnetic water meter in the corresponding working state through formula 1; the power consumption calculation unit 3 obtains the continuous accumulated power consumption of the electromagnetic water meter according to the formula 2;
the method comprises the steps of obtaining a power supply voltage, a power consumption value and a power consumption value of an electromagnetic water meter, wherein Pn is real-time power consumption In different states, In is instantaneous current In different states, Vn is power supply voltage, P is accumulated power consumption, and t is accumulated time of the electromagnetic water meter In corresponding working states.
In an embodiment of the present invention, the real-time power consumption calculation circuit of the lithium battery of the electromagnetic water meter further includes: the power consumption display unit comprises a local lithium battery power consumption icon and alarm display unit and a remote lithium battery power consumption icon and alarm information sending unit. The capacity of the lithium battery is reduced along with the increase of the accumulated power consumption, and the local lithium battery power consumption icon and alarm display unit is used for displaying the icons of the graded reduction of the capacity of the lithium battery and the alarm on the display screen of the electromagnetic water meter; the remote transmission lithium battery power consumption icon and alarm information sending unit is used for sending a lithium battery residual capacity value and alarm information to the user system platform through a data remote transmission module of the electromagnetic water meter.
The invention also discloses a method for calculating the real-time power consumption of the lithium battery of the electromagnetic water meter, and fig. 3 is a flow chart of the method for calculating the real-time power consumption of the lithium battery of the electromagnetic water meter in the embodiment of the invention; referring to fig. 3, in an embodiment of the present invention, a method for calculating real-time power consumption of a lithium battery of an electromagnetic water meter includes:
step S1, a working state time measuring step, wherein the working state time measuring unit respectively calculates the time of each working state when the electromagnetic water meter is in a dormant state, a measuring state and a calibration state;
step S2, a real-time current detection step, which is to measure the current value under each working state; and
step S3, calculating the power consumption of each working state, and accumulating the power consumption of all working states to obtain the accumulated real-time power consumption of the electromagnetic water meter.
In an embodiment of the present invention, the method for calculating the real-time power consumption of the lithium battery of the electromagnetic water meter further includes:
the method comprises the steps of local lithium battery power consumption icon and alarm display, wherein icons of lithium battery capacity reduction and alarm are displayed on a display screen of the electromagnetic water meter; and
and (3) sending the power consumption icon and alarm information of the remote transmission lithium battery, and sending the residual capacity value and the alarm information of the lithium battery to the user system platform through a data remote transmission module of the electromagnetic water meter.
In an embodiment of the present invention, in the step of calculating the power consumption, the power consumption of the electromagnetic water meter in the corresponding working state is obtained through formula 1;
in the power consumption calculation step, the continuous accumulated power consumption of the electromagnetic water meter is obtained according to a formula 2;
the method comprises the steps of obtaining a power supply voltage, a power consumption value and a power consumption value of an electromagnetic water meter, wherein Pn is real-time power consumption In different states, In is instantaneous current In different states, Vn is power supply voltage, P is accumulated power consumption, and t is accumulated time of the electromagnetic water meter In corresponding working states.
In conclusion, the real-time power consumption calculation circuit and method for the lithium battery of the electromagnetic water meter, provided by the invention, can accurately detect the overall power consumption of the electromagnetic water meter in real time under the condition of using lower power consumption, know the power consumption condition of the lithium battery in time, find out the problem in time and solve the problem in time, and can send out power early warning in advance, replace the lithium battery in time and ensure the normal use of the electromagnetic water meter.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (10)
1. The utility model provides an electromagnetism water gauge lithium cell real-time power consumption computational circuit, its characterized in that, electromagnetism water gauge lithium cell real-time power consumption computational circuit includes:
the working state time measuring unit is used for acquiring the time of the electromagnetic water meter in each working state;
the real-time current detection unit is used for detecting real-time current so as to detect the current value of the electromagnetic water meter in each working state; and
and the power consumption calculating unit is used for calculating the power consumption of the electromagnetic water meter in each working state and the accumulated power consumption in each working state.
2. The real-time power consumption calculation circuit of the lithium battery of the electromagnetic water meter according to claim 1,
the working state of the electromagnetic water meter comprises a dormant state, a measuring state and a calibration state; the time measuring unit in the working state respectively obtains the time in each working state when the electromagnetic water meter is in a dormant state, a measuring state and a calibration state;
measuring current values under each working state according to the real-time current detection unit; and calculating the power consumption of each working state by the power consumption calculation unit, and accumulating the power consumption in all working states to obtain the accumulated real-time power consumption of the electromagnetic water meter.
3. The real-time power consumption calculation circuit of the lithium battery of the electromagnetic water meter according to claim 1,
real-time power consumption calculation circuit of electromagnetism water gauge lithium cell further includes:
the local lithium battery power consumption icon and alarm display unit is used for displaying icons of lithium battery capacity reduction and alarm on a display screen of the electromagnetic water meter; and
and the remote transmission lithium battery power consumption icon and alarm information sending unit is used for sending a lithium battery residual capacity value and alarm information to the user system platform through the data remote transmission module of the electromagnetic water meter.
4. The real-time power consumption calculation circuit of the lithium battery of the electromagnetic water meter according to claim 1, characterized in that:
the real-time current detection circuit comprises a first chip U1, a first connection port J1, a second connection port J2, a plurality of capacitors and a plurality of resistors; the first chip U1 comprises a first pin IN + pin, a second pin VDD-pin, a third pin IN-pin, a fourth pin OUT pin and a fifth pin VDD + pin;
a first pin IN + of the first chip U1 is grounded through a third resistor R3, a second pin VDD-of the first chip U1 is connected with a first end of a second capacitor C2, and a second end of the second capacitor C2 is grounded;
a third pin IN-of the first chip U1 is respectively connected with a first end of a seventh resistor R7 and a first end of a sixth resistor R6; a fourth pin OUT of the first chip U1 is respectively connected with a second end of the sixth resistor R6 and a first end of the fourth resistor R4; a second end of the fourth resistor R4 is connected to a first end of the third capacitor C3 and a first end of the fifth resistor R5, respectively, a second end of the third capacitor C3 is grounded, and a second end of the fifth resistor R5 is grounded;
a fifth pin VDD + of the first chip U1 is connected with a first end of a first capacitor C1, and a second end of the first capacitor C1 is grounded;
the second end of the seventh resistor R7 is respectively connected with the first end of the first resistor R1, the second pin of the first connection port J1 and the battery cathode voltage VBAT-; the second end of the first resistor R1 and the second pin of the second connection port J2 are grounded respectively; the first pin of the first connection port J1 is connected to the battery positive voltage VBAT + and the first pin of the second connection port J2.
5. The real-time power consumption calculation circuit of the lithium battery of the electromagnetic water meter according to claim 4, characterized in that:
the battery negative voltage VBAT-passes through the first resistor R1 and then reaches the ground terminal AGND, a slight voltage is obtained at the first resistor R1, and after being amplified by the first chip U1,
sampling is carried out for a very short time through ADC, and the sampled data is sent to the MCU for calculation to obtain the power consumption under the corresponding working state.
6. The real-time power consumption calculation circuit of the lithium battery of the electromagnetic water meter according to claim 1, characterized in that:
the power consumption calculation unit obtains the power consumption of the electromagnetic water meter in the corresponding working state through a formula 1;
the power consumption calculation unit obtains the continuous accumulated power consumption of the electromagnetic water meter according to a formula 2;
the method comprises the steps of obtaining a power supply voltage, a power consumption value and a power consumption value of an electromagnetic water meter, wherein Pn is real-time power consumption In different states, In is instantaneous current In different states, Vn is power supply voltage, P is accumulated power consumption, and t is accumulated time of the electromagnetic water meter In corresponding working states.
7. The real-time power consumption calculation circuit of the lithium battery of the electromagnetic water meter according to claim 1, characterized in that: the working state time measuring unit is used for monitoring the state of the electromagnetic water meter in the three working states in real time and measuring the accurate time of the working state in real time through the timer of the MCU.
8. A real-time power consumption calculation method for a lithium battery of an electromagnetic water meter is characterized by comprising the following steps:
a working state time measuring step, namely respectively acquiring time in each working state when the electromagnetic water meter is in a dormant state, a measuring state and a calibration state;
a real-time current detection step, which is to measure the current value under each working state; and
and a power consumption calculating step, namely calculating the power consumption of each working state, and accumulating the power consumption in all the working states to obtain the accumulated real-time power consumption of the electromagnetic water meter.
9. The method for calculating the real-time power consumption of the lithium battery of the electromagnetic water meter according to claim 8,
the real-time power consumption calculation method for the lithium battery of the electromagnetic water meter further comprises the following steps:
the method comprises the steps of local lithium battery power consumption icon and alarm display, wherein icons of lithium battery capacity reduction and alarm are displayed on a display screen of the electromagnetic water meter; and
and (3) sending the power consumption icon and alarm information of the remote transmission lithium battery, and sending the residual capacity value and the alarm information of the lithium battery to the user system platform through a data remote transmission module of the electromagnetic water meter.
10. The method for calculating the real-time power consumption of the lithium battery of the electromagnetic water meter according to claim 8,
in the power consumption calculation step, the power consumption of the electromagnetic water meter in the corresponding working state is obtained through a formula 1;
in the power consumption calculation step, the continuous accumulated power consumption of the electromagnetic water meter is obtained according to a formula 2;
the method comprises the steps of obtaining a power supply voltage, a power consumption value and a power consumption value of an electromagnetic water meter, wherein Pn is real-time power consumption In different states, In is instantaneous current In different states, Vn is power supply voltage, P is accumulated power consumption, and t is accumulated time of the electromagnetic water meter In corresponding working states.
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| CN114252784A (en) * | 2021-12-07 | 2022-03-29 | 上海飞奥燃气设备有限公司 | Method for calculating residual capacity of lithium secondary battery |
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