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Voltameter circuit, control method, voltameter and terminal

A technology of electricity metering and electricity meter, which is applied in the direction of measuring electric variables, measuring devices, instruments, etc., can solve the problem that the electricity meter circuit cannot adapt to current changes, and achieve the effect of avoiding heat loss and burning out devices

Pending Publication Date: 2021-10-22
BLACKSHARK TECH NANCHANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Based on this, the purpose of the present invention is to provide a fuel gauge circuit, a control method, a fuel gauge and a terminal to solve the technical problem that the current fuel gauge circuit cannot adapt to current changes

Method used

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  • Voltameter circuit, control method, voltameter and terminal
  • Voltameter circuit, control method, voltameter and terminal
  • Voltameter circuit, control method, voltameter and terminal

Examples

Experimental program
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Effect test

Embodiment 1

[0040] see figure 2 , shows the fuel gauge circuit in the first embodiment of the present invention, which is connected to the charging and discharging circuit 20 of the terminal, and is used to measure the charging and discharging power. The fuel gauge circuit includes a current detection circuit and is connected to the current detection circuit The power metering module 12, wherein:

[0041] The current detection circuit is connected in series on the charging and discharging circuit 20, the current detection circuit includes a plurality of current detection branches 11, and the plurality of current detection branches 11 are connected in parallel with each other, the current detection branch 11 includes a first controllable switch, and a plurality of first The controllable switches are respectively S1~SN (N>=2). When any first controllable switch is closed, the corresponding current detection branch 11 is turned on, thereby turning on the charging and discharging circuit 20....

Embodiment 2

[0054] see image 3 , shows the fuel gauge circuit in the second embodiment of the present invention, the difference between the fuel gauge circuit in this embodiment and the fuel gauge circuit in the first embodiment is:

[0055] At least one current detection branch 11 also includes a current detection resistor connected in series with the first controllable switch on the current detection branch, and the two input terminals of the gain controllable amplifier are respectively connected to both ends of the current detection branch. The potential at both ends of the current-sensing branch is used as the differential input of the gain controllable amplifier. In some optional embodiments of this embodiment, such as image 3 As shown, except for the current-sensing branch where the first controllable switch S1 is located, the other current-sensing branches include current-sensing resistors, and the multiple current-sensing resistors are respectively Rsense2˜RsenseN (N>=2). That...

Embodiment 3

[0060] see Figure 4 , shows the fuel gauge circuit in the third embodiment of the present invention, the difference between the fuel gauge circuit in this embodiment and the fuel gauge circuit in the second embodiment is:

[0061] Each current detection branch includes a current detection resistor, and the two input terminals of the gain controllable amplifier are respectively connected to both ends of the current detection resistor, so that the potential at both ends of the current detection resistor is used as a differential input of the gain controllable amplifier. That is, in this embodiment, the current-sensing resistor is solely used as the current-sensing impedance of the current-sensing branch 11 . At the same time, one end of each current-sensing resistor is connected to the negative electrode of the gain-controllable amplifier through a second controllable switch. The plurality of second controllable switches are K1-KN (N>=2), and the second controllable switch K1-...

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Abstract

The invention provides a voltameter circuit, a control method, a voltameter and a terminal.The voltameter circuit comprises: a current detection circuit which is connected to a charging and discharging circuit in series, wherein the current detection circuit comprises a plurality of current detection branches which are connected in parallel, each current detection branch at least comprises a first controllable switch, and when any first controllable switch is closed, and the corresponding current detection branches are switched on, so that the charging and discharging circuit is switched on, and each current detection branch has different current detection impedance; and an electric quantity metering module which is used for collecting voltage signals at the two ends of the current detection impedance of any current detection branch and metering the electric quantity according to the voltage signals. According to the voltameter circuit, the current detection branches with different current detection impedances can be switched to cope with current changes in a path.

Description

technical field [0001] The present invention relates to the technical field of terminals, in particular to a fuel gauge circuit, a control method, a fuel gauge and a terminal. Background technique [0002] At present, mobile phones and other handheld devices are equipped with fuel gauges, which are connected to the charging and discharging circuit of the terminal to measure the charging and discharging power, so as to reflect the current remaining power of the device more accurately, especially for most current devices. All equipped with fast charging function, the role of fuel gauge becomes more obvious. [0003] In the prior art, the circuit principle of the electricity meter currently used is as follows: figure 1 As shown, only one precision resistor Rsense is used to detect the current in the charging and discharging path, that is, the fuel gauge first collects the voltage at both ends of Rsense, and since the resistance value of Rsense is known, the current in the char...

Claims

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Application Information

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IPC IPC(8): G01R22/06
CPCG01R22/06
Inventor 胡林李琳
Owner BLACKSHARK TECH NANCHANG CO LTD
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