Battery device power protection and reset circuit

• US 9,312,715 B2
• Filed: 11/26/2012
• Issued: 04/12/2016
• Est. Priority Date: 12/21/2011
• Status: Active Grant

• Current Assignee: Chicony Electronics Company Limited
• Original Assignee: Chicony Electronics Company Limited
• Inventors: Huang, Wei-Cheng, Tsai, Mei-Yi, Chiu, Wei-Ming
• Primary Examiner(s): Dunn, Drew A
• Assistant Examiner(s): Robbins, Jerry D
• Application Number:
  US13/684,589
• Publication Number:
  US 20130162219A1
• Time in Patent Office: 1,233 Days
• Field of Search: 320/135
• US Class Current: 1/1
• CPC Class Codes: H02J 7/0032 disconnection of loads if battery is not under charge, e.g. in vehicle if engine is not running
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/007182 in response to battery voltage

Abstract

An electronic device and a method of operating the same are disclosed, where the electronic device includes a main system, a battery, and a battery device power protection and reset circuit. The battery device power protection and reset circuit includes a charging circuit and a switch device. The switch device connects the battery and the main system. The charging circuit turns off the switch device when operating under a first trigger mode, so that the switch device can electrically isolate the main system from the battery.

Claims

1. An electronic device comprising:

a main system;

a battery;

a power button connected to the battery;

a battery device power protection and reset circuit comprising;

a switch device connected to the main system and the battery; and

a charging circuit connected to the power button and configured for turning off the switch device when operating under a first trigger mode, so that the switch device electrically isolates the main system from the battery,

wherein after the main system is electrically isolated from the battery, the charging circuit turns on the switch device when operating under a second trigger mode, so that the switch device electrically connects the main system to the battery,

wherein when the power button is pressed over a predetermined period, the charging circuit operates under the first trigger mode and is charged by the battery, and a charging voltage of the charging circuit turns off the switch device,

wherein after the main system is electrically isolated from the battery, when the power button is pressed again but duration of pressing the power button is shorter than the predetermined period, the charging circuit operates under the second trigger made to turn on the switch device,

wherein the power button has a first terminal electrically coupled with the battery and a second terminal electrically coupled with the charging circuit, the first and second terminals are electrically connected to each other when the power button is pressed, and the first and second terminals are electrically isolated from each other when the power button is not pressed,

wherein the charging circuit comprises a resistor and a charging capacitor, the resistor is connected to the second terminal of the power button, a first terminal of the charging capacitor is connected to the resistor, and a second terminal of the charging capacitor is grounded;

when the first terminal and the second terminal of the power button are electrically connected to each other, the charging capacitor is charged;

the predetermined period depends on a resistance of the resistor and a capacitance of the charging capacitor.

2. The electronic device of claim 1, wherein the switch device comprises a first switch circuit, and the first switch circuit comprises a first metal-oxide-semiconductor (MOS), wherein a gate of the first MOS is connected to the first terminal of the charging capacitor, a drain of the first MOS is coupled with a voltage input terminal of the main system, and a source of the first MOS is grounded.

3. The electronic device of claim 2, wherein the switch device comprises a second switch circuit, and the second switch circuit comprise a second MOS, wherein a gate of the second MOS is connected to the drain of the first MOS, and a source of the second MOS is grounded.

4. The electronic device of claim 3, wherein the switch device comprises a third switch circuit, and the third switch circuit comprises a third MOS, wherein a gate of the third MOS is connected to the drain of the second MOS, a drain of the third MOS is connected to the voltage input terminal of the main system, and the source of the third MOS is connected to the battery, wherein the gate of the third MOS and the source of the third MOS are coupled to each other.