BATTERY POWER MEASURING METHOD, MEASURING DEVICE AND BATTERY-POWERED EQUIPMENT

• US 20140163910A1
• Filed: 11/18/2013
• Published: 06/12/2014
• Est. Priority Date: 12/11/2012
• Status: Active Grant

• Current Assignee: Nanjing Silergy Semiconductor (Hong Kong) Technology Ltd.
• Original Assignee: Silergy Semiconductor Technology (Hangzhou) Ltd. (Silergy Corporation)
• Inventors: Yu, Feng, Huang, Xiaodong, Cao, Hejinsheng
• Granted Patent: US 9,645,200 B2
• Time in Patent Office: Days
• US Class Current: 702/63
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/3835 involving only voltage measurements

Abstract

Disclosed herein are various battery power measurement devices, methods, and related apparatuses. In one embodiment, a method of measuring a battery power can include: (i) detecting a voltage and a temperature at an output terminal of a battery; (ii) obtaining a first correction coefficient based on a battery open-circuit voltage at a previous sample time; (iii) obtaining a second correction coefficient based on the battery temperature; (iv) calculating a real-time battery open-circuit voltage by using the voltage at the output terminal of the battery, the first and second correction coefficients, the battery open-circuit voltage at the previous sample time, and a time interval between the previous sample time and a present sample time; and (v) converting the real-time battery open-circuit voltage into a battery power measurement for display.

Claims

1. A method of measuring a battery power, the method comprising:

a) detecting a voltage and a temperature at an output terminal of a battery;

b) obtaining a first correction coefficient based on a battery open-circuit voltage at a previous sample time;

c) obtaining a second correction coefficient based on said battery temperature;

d) calculating a real-time battery open-circuit voltage by using said voltage at said output terminal of said battery, said first and second correction coefficients, said battery open-circuit voltage at said previous sample time, and a time interval between said previous sample time and a present sample time; and

e) converting said real-time battery open-circuit voltage into a battery power measurement for display.

2. The method of claim 1, further comprising:

a) determining if said battery is in a relaxed state based on a changing rate of said real-time battery open-circuit voltage; and

b) setting said real-time battery open-circuit voltage to be equal to said voltage at said output terminal of said battery when said battery is in said relaxed state.

3. The method of claim 1, further comprising storing said real-time battery open-circuit voltage for calculating a subsequent battery open-circuit voltage.

4. The method of claim 1, further comprising:

a) detecting said battery; and

b) determining a relationship between said battery open-circuit voltage and said battery power measurement.

5. The method of claim 1, further comprising:

a) detecting said battery;

b) determining a relationship between said first correction coefficient and said battery open-circuit voltage; and

c) determining a relationship between said second correction coefficient and said battery temperature.

6. A battery power measuring device, comprising:

a) a detection device configured to detect a voltage and a temperature at an output terminal of a battery;

b) a storage device configured to store a first correction coefficient corresponding to a battery open-circuit voltage at a previous sample time, and a second correction coefficient corresponding to said temperature;

c) a calculation device configured to calculate a real-time battery open-circuit voltage based on said voltage at said output terminal of said battery, said first and second correction coefficients, said battery open-circuit voltage at said previous sample time, and a time interval between said previous sample time and a present sample time; and

d) a display device configured to convert said real-time battery open-circuit voltage to a battery power measurement for display.

7. The battery power measuring device of claim 6, further comprising a calibration circuit configured to determine if said battery is in a relaxed state based on a changing rate of said real-time battery open-circuit voltage, and to set said real-time battery open-circuit voltage to be equal to said voltage at said output terminal of said battery when said battery is in said relaxed state.

8. The battery power measuring device of claim 6, wherein said storage device is configured to store said real-time battery open-circuit voltage to calculate a subsequent battery open-circuit voltage.

9. The battery power measuring device of claim 6, wherein said storage device is configured to store data characterizing a relationship between said real-time battery open-circuit voltage and said battery power measurement.

10. The battery power measuring device of claim 6, wherein said storage device is configured to store:

a) data characterizing a relationship between said real-time battery open-circuit voltage and said first correction coefficient; and

b) data characterizing a relationship between said temperature and said second correction coefficient.

11. An apparatus, comprising:

a) said battery power measuring device of claim 6;

b) a charging power supply configured to charge said battery; and

c) electrical equipment configured to receive power from said battery.