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Battery capacity measuring circuit, and battery capacity accurate calculating method and system

A voltage measurement circuit and battery capacity technology, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of power display jumping, power error, early shutdown, etc., to save power, accurate power indication, and solve errors. bootstrap effect

Inactive Publication Date: 2017-12-22
PHICOMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a battery capacity measurement circuit, a battery capacity accurate calculation method and system, which can provide high-precision battery capacity detection, and help related mobile devices to solve power error display, The power display jumps and the problem of early shutdown

Method used

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  • Battery capacity measuring circuit, and battery capacity accurate calculating method and system
  • Battery capacity measuring circuit, and battery capacity accurate calculating method and system
  • Battery capacity measuring circuit, and battery capacity accurate calculating method and system

Examples

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Embodiment 1

[0043] Such as figure 1 As shown, this embodiment provides a battery capacity measurement circuit, including a main circuit formed by connecting a battery, a device load, and a resistor in series, a first voltage measurement circuit connected to one end of the resistor, and a first voltage measurement circuit connected to the other end of the resistor. The second voltage measurement circuit, the first voltage measurement circuit and the second voltage measurement circuit are used to measure the terminal voltage value, and also include:

[0044] A power management circuit and a constant current source circuit, the power management circuit is connected in parallel with the battery to realize battery power supply and ensure the management work of the power management circuit; the constant current source circuit is connected in parallel with the resistor to apply a constant current to the resistor , to help the calculation of the actual resistance value; the power management circu...

Embodiment 2

[0049] Such as figure 2 As shown, this embodiment provides a method for accurately calculating battery capacity based on the battery capacity measuring circuit described in Embodiment 1, and the method includes the following steps:

[0050] S10: Calculate the resistance value of the resistor; in this step, the resistance value (difference than the nominal value, including the resistance change caused by the production error of the solder and the resistor itself).

[0051] S20: Calculate the current value passing through the load of the device; in this step, the current value passing through the load of the device can be directly measured through the relevant electrical equipment, or the voltage difference between the two ends of the resistor can be measured first, and then divided by the actual resistance value of the resistor To obtain the current passing through the resistor, according to the theoretical knowledge of physics, the same current flows through the circuits con...

Embodiment 3

[0055] Such as image 3 As shown, the difference between this embodiment and Embodiment 2 is that this embodiment provides a more detailed method for accurately calculating battery capacity based on a battery capacity measurement circuit, and the step S10 includes:

[0056] S11: Obtain the voltage difference △U1 between the two ends of the resistor when the power management circuit supplies power to the constant current source circuit; when the terminal device is turned on, the battery is discharged, and the current is output through the positive pole, and the power management circuit receives power to work , to supply power to the constant current source circuit. At this time, the constant current source will generate a constant current and apply it to the resistor, and a voltage difference will be generated at both ends of the resistor. In this step, when the power management circuit supplies power to the constant current source circuit, through the first A voltage measureme...

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Abstract

The invention discloses a battery capacity measuring circuit, and a battery capacity accurate calculating method and system. The battery capacity accurate calculating method includes: S10, calculating resistance of a resistor; S20, calculating a current value passing across a device load; and S30, calculating current capacitance of a battery. Instead of direct use of a resistor nominal value, actual resistance of the resistor is measured and calculated at first, thereby solving the problem of terminal device battery capacity detection errors caused by inconsistency between the actual value and the nominal value on two ends of the resistor. In this way, the battery capacity calculation precision is increased, problems of wrong guidance, electric quantity jump and shutdown in advance caused by resistance errors are solved, the user experience is improved, and users are helped to correctly arrange usage of devices.

Description

technical field [0001] The invention relates to the technical field of battery measurement for mobile devices, in particular to a battery capacity measurement circuit, a method and a system for accurately calculating the battery capacity. Background technique [0002] The battery is an essential component of portable devices such as mobile devices. It is used to provide power for the operation of other internal working components. The capacity of the battery affects the working hours of the working components in portable devices. OK, so the bigger the capacitance, the better. However, in the process of designing portable devices, since the battery capacity used is getting larger and larger, and users require higher and higher accuracy in understanding the power status during use, it is necessary to optimize the power display of the device to improve display accuracy. [0003] In the actual battery application, due to the use in different environments (load, temperature chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3835G01R31/3828
Inventor 王双军
Owner PHICOMM (SHANGHAI) CO LTD
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