BATTERY DISCHARGE CIRCUIT AND DISCHARGE METHOD THEREOF

• US 20100060237A1
• Filed: 07/24/2009
• Published: 03/11/2010
• Est. Priority Date: 09/05/2008
• Status: Abandoned Application

• Current Assignee: FIH (Hong Kong) Limited (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: FIH (Hong Kong) Limited (Hon Hai Precision Industry Co., Ltd.)
• Inventors: HSIEH, Hsing-Yuan
• Application Number:
  US12/509,041
• Publication Number:
  US 20100060237A1
• Time in Patent Office: Days
• US Class Current: 320/136
• CPC Class Codes: H02J 7/00306 Overdischarge protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• 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

A battery discharge circuit, used to couple a battery to an electronic device, includes a battery protecting module and a voltage adjusting module. The battery protecting module detects an output voltage of the battery, compares the output voltage with an end voltage of the battery, and selectively discharges the battery or not in response to the comparison result. The voltage adjusting module compares the output voltage with a work voltage of the electronic device, and selectively directly outputs the output voltage or boosts the output voltage first and then outputs the boosted output voltage.

Claims

1. A battery discharge circuit, used to couple a battery to an electronic device comprising:

a battery protecting module for detecting an output voltage of the battery, comparing the output voltage with an end voltage of the battery, and selectively discharge the battery or not in response to the comparison result; and

a voltage adjusting module connecting to the battery protecting module, and comparing the output voltage with a work voltage of the electronic device, and selectively directly output the output voltage or boosting the output voltage first and then output the boosted output voltage.

2. The battery discharge circuit as claimed in claim 1, wherein the battery protecting module comprises a detecting unit configured to connect with the battery, detect the output voltage and compare the output voltage with the end voltage.

3. The battery discharge circuit as claimed in claim 2, wherein the battery protecting module further comprises a switch unit connecting with the detecting unit and configured to turn to a cut-off mode to terminate discharge of the battery when the output voltage is below the end voltage.

4. The battery discharge circuit as claimed in claim 1, wherein the voltage adjusting module comprises a voltage comparison unit serially connected between the battery protecting module and the electronic device to receive the output voltage, and configured to compare the output voltage with the work voltage and directly output the output voltage to the electronic device when the output voltage is higher than the work voltage.

5. The battery discharge circuit as claimed in claim 4, wherein the voltage adjusting module further comprises a voltage booster unit serially connected between the voltage comparison unit and the electronic device, and configured to receive the output voltage from the voltage comparison unit, boost the output voltage to the work voltage and output the boosted output voltage to the electronic device when the output voltage is below the work voltage.

6. A discharge method of the battery discharge circuit as claimed in claim 1, comprising:

detecting an output voltage of a battery;

comparing the output voltage with an end voltage of the battery;

selectively discharge the battery or not in response to the comparison result;

comparing the output voltage with a work voltage of an electronic device; and

selectively directly output the output voltage or boosting the output voltage first and then output the boosted output voltage.

7. The discharge method as claimed in claim 6, wherein the step c of selectively discharge the battery or not in response to the comparison result further comprises:

discharging the battery when the output voltage is higher than the end voltage; and

terminating the discharge of the battery when the output voltage is below the end voltage.

8. The discharge method as claimed in claim 6, wherein the step of selectively directly output the output voltage or boosting the output voltage first and then output the boosted output voltage further comprises:

directly output the output voltage when the output voltage is higher than the work voltage; and

boosting the output voltage first and then output the boosted output voltage when the output voltage is below the work voltage.