Battery detection system and related method

• US 20070126402A1
• Filed: 08/11/2006
• Published: 06/07/2007
• Est. Priority Date: 12/02/2005
• Status: Abandoned Application

• Current Assignee: Premier Image Technology Corp (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Premier Image Technology Corp (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Hsu, Chien-Kuo, Tsai, Shen-Fu
• Application Number:
  US11/502,514
• Publication Number:
  US 20070126402A1
• Time in Patent Office: Days
• US Class Current: 320/134
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]

Abstract

A battery detection system and related method are provided. The battery detection system according to the invention is coupled to a battery for detecting the type and remaining power of the battery, and includes a processor coupled to an A/D converter and an I/O control; a circuit, comprising a switch and a load, wherein the I/O control is used to control the switch for enabling or disabling the load. When the load is enabled, the A/D converter obtains a first voltage; when the load is disabled, the A/D converter obtains a second voltage. By calculating the first and second voltages, the processor obtains the type and remaining power of the battery.

Claims

1. A battery detection system, the battery detection system is set in an electronic device and coupled to a battery for detecting the type and remaining electrical power of the battery, the battery detection system comprising:

a processor coupled to an A/D converter and an I/O control end; and

a circuit comprising a switch and a load, wherein the I/O control end is used for controlling the switch to enable or disable the load;

wherein when a current passes through the load and the load is enabled, the A/D converter obtains a first voltage value of the battery;

when a current passes the load and the load is disabled, the A/D converter obtains a second voltage value of the battery; and

the processor calculates the first and second voltages to obtain at least one of the type and remaining electrical power of the battery.

2. The battery detection system as claimed in claim 1, wherein the I/O control end is an I/O control pin.

3. The battery detection system as claimed in claim 1, wherein the switch is a metal oxide semiconductor field effect transistor (MOSFET).

4. The battery detection system as claimed in claim 1, wherein the load is a resistor.

5. The battery detection system as claimed in claim 1, wherein the type of the battery includes a Ni-MH battery, a Li battery or an alkaline battery.

6. The battery detection system as claimed in claim 1, wherein the processor utilizes a predetermined voltage drop characteristic table to obtain at least one of the type and remaining electrical power of the battery.

7. A battery detection method for obtaining a type and remaining electrical power of a battery in an electronic device, the method comprising:

electrically coupling the battery to a circuit, the circuit comprising a switch and a load;

controlling the switch to enable the load;

when the load is enabled, a current passing through the load to obtain a first voltage value of the battery;

controlling the switch to disable the load;

when the load is disabled, a current passing through the load to obtain a second voltage value of the battery; and

comparing the first voltage value and the second voltage value to obtain at least one of the type and remaining electrical power of the battery.

8. The battery detection method as claimed in claim 7, wherein the switch is a metal oxide semiconductor field effect transistor (MOSFET).

9. The battery detection method as claimed in claim 7, wherein the load is a resistor.

10. The battery detection method as claimed in claim 7, wherein the type of the battery includes a Ni-MH battery, a Li battery or an alkaline battery.

11. The battery detection method as claimed in claim 7 further comprising:

comparing a voltage drop between the first voltage value and the second voltage value to a predetermined voltage drop characteristic table to obtain at least one of the type and remaining electrical power of the battery.