CHARGING CIRCUIT

• US 20120007566A1
• Filed: 08/31/2010
• Published: 01/12/2012
• Est. Priority Date: 07/12/2010
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: HSU, MING-YUAN
• Granted Patent: US 8,446,130 B2
• Time in Patent Office: Days
• US Class Current: 320/162
• CPC Class Codes: H02J 7/00041 in response to measured battery parameters, e.g. voltage, current or temperature profile
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries
• CPC Class Codes: H02J 7/007182 in response to battery voltage

Abstract

A charging circuit for charging a battery includes a processor, a switching circuit, a voltage converter, and a power voltage detecting circuit. A first terminal of the switching circuit is connected to a power source. A second terminal of the switching circuit is connected to a first output of the processor. A first terminal of the voltage converter is connected to a third terminal of the switching circuit. A second terminal of the voltage converter is connected to the battery. The power voltage detecting circuit is connected to the power source, and a first input and a second output of the processor.

Claims

1. A charging circuit for a battery, the charging circuit comprising:

a processor comprising a first output, a second output, and a first input;

a switching circuit comprising a first terminal connected to a power source, a second terminal connected to the first output of the processor, and a third terminal;

a voltage converter comprising a first terminal connected to the third terminal of the switching circuit, and a second terminal connected to the battery, the voltage converter converting the voltage of the power source to a standard voltage matching the battery; and

a power voltage detecting circuit connected to the power source, and the first input and the second output of the processor, wherein the second output of the processor controls the working mode of the power voltage detecting circuit, the first input of the processor detects the voltage of the power source through the power voltage detecting circuit, the first output of the processor controls the switching circuit to disconnect the power source from the battery when the voltage of the power source is beyond a predetermined range.

2. The charging circuit of claim 1, wherein the power voltage detecting circuit comprises a first resistor, a second resistor, a third resistor, a first switch, a second switch, and an inverter, a first terminal of the first resistor is connected to an anode of the power source, a second terminal of the first resistor is connected to a first contact of the first switch through the second resistor, the second terminal of the first resistor is also connected to a first contact of the second switch through the third resistor, a second contact of the first switch is connected to a cathode of the power source, a control terminal of the first switch is connected to the second output of the processor, a second contact of the second switch is connected to the cathode of the power source, a control terminal of the second switch is connected to a cathode of the inverter, an anode of the inverter is connected to the second output of the processor, the first input of the processor is connected to a node between the first resistor and the third resistor.

3. The charging circuit of claim 2, wherein the resistance of the first resistor is 9 kilohms (KΩ

), the resistance of the second resistor is 1KΩ

, the resistance of the third resistor is 2.25KΩ

.

4. The charging circuit of claim 2, wherein when the control terminal of the first switch or the second switch is at a high voltage level, the first contact contacts the second contact, when the control terminal of the first switch or the second switch is at a low voltage level, the first contact does not contact the second contact.

5. The charging circuit of claim 2, further comprising a battery voltage detecting circuit, wherein the processor further comprises a second input, the battery voltage detecting circuit is connected to the battery, and the second input and the second output of the processor, the second input of the processor detects the voltage of the battery through the battery voltage detecting circuit, the second output of the processor controls the working mode of the battery voltage detecting circuit.

6. The charging circuit of claim 5, wherein the battery voltage detecting circuit comprises a fourth resistor, a fifth resistor, a sixth resistor, a third switch, and a fourth switch, a first terminal of the fourth resistor is connected to an anode of the battery, a second terminal of the fourth resistor is connected to a first contact of the third switch through the fifth resistor, the second terminal of the fourth resistor is also connected to a first contact of the fourth switch through the sixth resistor, a second contact of the third switch is connected to a cathode of the battery, a control terminal of the third switch is connected to the second output of the processor, a second contact of the fourth switch is connected to the cathode of the battery, a control terminal of the fourth switch is connected to the cathode of the inverter, the second input of the processor is connected to a node between the fourth resistor and the fifth resistor.

7. The charging circuit of claim 6, wherein the resistance of the fourth resistor is 4 kilohms (KΩ

), the resistance of the fifth resistor is 1KΩ

, the resistance of the sixth resistor is 2KΩ

.

8. The charging circuit of claim 6, wherein when the control terminal of the third switch or the fourth switch is at a high voltage level, the first contact contacts the second contact, when the control terminal of the third switch or the fourth switch is at a low voltage level, the first contact does not contact the second contact.

9. A charging circuit for a battery, the charging circuit comprising:

a processor comprising a first output, a second output, and an input;

a switching circuit comprising a first terminal connected to a power source, a second terminal connected to the first output of the processor, and a third terminal;

a voltage converter comprising a first terminal connected to the third terminal of the switching circuit, and a second terminal connected to the battery, the voltage converter converting the voltage of the power source to a standard voltage matching the battery; and

a battery voltage detecting circuit connected to the battery, and the input and the second output of the processor, wherein the input of the processor detects the voltage of the battery through the battery voltage detecting circuit, the second output of the processor controls the working mode of the battery voltage detecting circuit.

10. The charging circuit of claim 9, wherein the battery voltage detecting circuit comprises a first resistor, a second resistor, a third resistor, a first switch, and a second switch, a first terminal of the first resistor is connected to an anode of the battery, a second terminal of the first resistor is connected to a first contact of the first switch through the second resistor, the second terminal of the first resistor is also connected to a first contact of the second switch through the third resistor, a second contact of the first switch is connected to a cathode of the battery, a control terminal of the first switch is connected to the second output of the processor, a second contact of the second switch is connected to the cathode of the battery, a control terminal of the second switch is connected to the cathode of the inverter, the input of the processor is connected to a node between the first resistor and the second resistor.

11. The charging circuit of claim 10, wherein the resistance of the first resistor is 4 kilohms (KΩ

), the resistance of the second resistor is 1KΩ

, the resistance of the third resistor is 2KΩ

.

12. The charging circuit of claim 10, wherein when the control terminal of the first switch or the second switch is at a high voltage level, the first contact contacts the second contact, when the control terminal of the first switch or the second switch is at a low voltage level, the first contact does not contact the second contact.