Voltage indicating circuit for mobile phone battery

• US 8,532,717 B2
• Filed: 06/05/2012
• Issued: 09/10/2013
• Est. Priority Date: 12/09/2009
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Zhou, Shilei
• Primary Examiner(s): TRAN, CONGVAN
• Application Number:
  US13/488,675
• Publication Number:
  US 20120295669A1
• Time in Patent Office: 462 Days
• Field of Search: 455/572, 455/573, 455/343.5, 320/134, 320/162
• US Class Current: 455/572
• CPC Class Codes: G01R 31/3835 involving only voltage measurements

Abstract

The present invention discloses voltage indicating circuit for mobile phone battery, comprising: a battery, a mobile phone baseband module and a battery voltage detection module, wherein power input terminals of the mobile phone baseband module and battery voltage detection module are coupled with an anode of the battery, and a detection signal output terminal of the battery voltage detection module is coupled with a communication terminal of the mobile phone baseband module; the battery voltage detection module detects an output voltage of the anode of the battery and outputs a mobile phone battery voltage detection signal to the mobile phone baseband module through the detection signal output terminal; and the mobile phone baseband module receives the mobile phone battery voltage detection signal through the communication terminal and indicates a voltage of the battery according to the mobile phone battery voltage detection signal.

Claims

1. A voltage indicating circuit for a mobile phone battery, comprising a battery, further comprising a mobile phone baseband module and a battery voltage detection module, wherein power input terminals of the mobile phone baseband module and the battery voltage detection module are coupled with an anode of the battery, and a detection signal output terminal of the battery voltage detection module is coupled with a communication terminal of the mobile phone baseband module;

the battery voltage detection module detects an output voltage of the anode of the battery and outputs a mobile phone battery voltage detection signal to the mobile phone baseband module through the detection signal output terminal; and

the mobile phone baseband module receives the mobile phone battery voltage detection signal through the communication terminal and indicates a voltage of the battery according to the mobile phone battery voltage detection signals;

wherein the detection signal output terminal of the battery voltage detection module comprises at least two interrupt signal output terminals, the communication terminal of the mobile phone baseband module comprises at least two signal receiving terminals, and the interrupt signal output terminals and the signal receiving terminals are coupled in a one-to-one correspondence way;

the battery voltage detection module outputs a group of corresponding interrupt signals through the at least two interrupt signal output terminals according to a position of the detected output voltage of the anode of the battery in preset different voltage ranges, and the mobile phone baseband module displays a range in which the voltage of the battery is located according to the group of interrupt signals received.

2. The circuit according to claim 1, wherein there are two interrupt signal output terminals and two signal receiving terminals respectively.

3. The circuit according to claim 1, wherein the communication terminal of the mobile phone baseband module is universal Input/Output (I/O) interfaces of a mobile phone baseband main chip.

4. The circuit according to claim 2, wherein the battery voltage detection module comprises:

a first Low Dropout Regulator LDO (411) with an input terminal coupled with the anode of the battery and an output terminal being Vth1;

a second LDO (412) with an input terminal coupled with the anode of the battery and an output terminal being Vth2;

resistors R1, R2 and R3 coupled in series to form a first branch, wherein one terminal of the first branch is coupled with the anode of the battery and the other terminal of the first branch is grounded, and the output voltage of the anode of the battery is output as Vin1 and Vin2 after being divided by the first branch;

resistors R4, R5 and R6 coupled in series to form a second branch, wherein one terminal of the second branch is coupled with the anode of the battery and the other terminal of the second branch is grounded, and the output voltage of the anode of the battery is output as Vin3 and Vin4 after being divided by the second branch;

a first voltage comparator (413) with an in-phase input terminal coupled with the Vthl, an inversed-phase input terminal coupled with the Vini, and an output terminal being 01;

a second voltage comparator (414) with an in-phase input terminal coupled with the Vin2, an inversed-phase input terminal coupled with the Vth2, and an output terminal being 02;

a third voltage comparator (415) with an in-phase input terminal coupled with the Vthl, an inversed-phase input terminal coupled with the Vin3, and an output terminal being 03;

a fourth voltage comparator (416) with an in-phase input terminal coupled with the Vin4, an inversed-phase input terminal coupled with the Vth2, and an output terminal being 04;

a first RS trigger (417) with an S interface coupled with the 01, an R interface coupled with the 02, and an output terminal being one interrupt signal output terminal of the battery voltage detection module; and

a second RS trigger (418) with an S interface coupled with the 03, an R interface coupled with the 04, and an output terminal being the other interrupt signal output terminal of the battery voltage detection module.

5. The circuit according to claim 2, wherein the communication terminal of the mobile phone baseband module is universal Input/Output (I/O) interfaces of a mobile phone baseband main chip.