ELECTROSTATIC PROTECTOR OF PORTABLE ELECTRONIC DEVICES

• US 20110012747A1
• Filed: 05/21/2010
• Published: 01/20/2011
• Est. Priority Date: 07/15/2009
• Status: Active Grant

• 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
• Granted Patent: US 8,421,645 B2
• Time in Patent Office: Days
• US Class Current: 340/815.45
• CPC Class Codes: H02H 9/041 using a short-circuiting device
• CPC Class Codes: H05K 9/0066 Constructional details of transient suppressor
• CPC Class Codes: H05K 9/0067 Devices for protecting against damage from electrostatic discharge

Abstract

An electrostatic protector used in a portable electronic device includes an electrostatic conducting unit and an electrostatic protecting unit connected to the electrostatic conducting unit. The electrostatic protecting unit includes at least one protecting circuit, each protecting circuit includes a diode, and the diode has a cathode connected to the electrostatic conducting unit and an anode grounded. Electrostatic charges on the portable electronic device are transmitted to the electrostatic conducting unit and generate a voltage on the cathode of the diode to break down the diode, such that the electrostatic charges are transmitted to the ground via the broken down diode and the voltage on the cathode of the diode is reduced.

Claims

1. An electrostatic protector used in a portable electronic device, comprising:

an electrostatic conducting unit;

an electrostatic protecting unit connected to the electrostatic conducting unit, the electrostatic protecting unit including at least one protecting circuit, each protecting circuit including a diode, the diode having a cathode connected to the electrostatic conducting unit and a grounded anode;

wherein electrostatic charges on the portable electronic device are transmitted to the electrostatic conducting unit and generate a voltage on the cathode of the diode to break down the diode, such that the electrostatic charges are transmitted to the ground by the broken down diode and the voltage on the cathode of the diode is reduced.

2. The electrostatic protector as claimed in claim 1, wherein the diode is a transient voltage suppressor (TVS) diode.

3. The electrostatic protector as claimed in claim 1, wherein the electrostatic conducting unit is made of conductive materials.

4. The electrostatic protector as claimed in claim 3, wherein the electrostatic conducting unit includes metal portions formed on the housing of the portable electronic device.

5. The electrostatic protector as claimed in claim 4, wherein the electrostatic conducting unit includes a dust-proof net of the portable electronic device and a keypad of the portable electronic device, and the electrostatic protecting unit includes two protecting circuits respectively connected to the dust-proof net and the keypad.

6. The electrostatic protector as claimed in claim 1, wherein each protecting circuit further includes a resistor, one end of the resistor grounded, and another end of the resistor connected to the electrostatic conducting unit.

7. The electrostatic protector as claimed in claim 1, further comprising a transformer unit, an alert unit and a power supply, the transformer unit including a transformer chip;

the transformer chip being a low dropout regulator (LDO) chip including a grounding connector, a voltage input connector, a voltage output connector, and an enable connector;

the grounding connector grounded, the electrostatic protecting unit connected to the enable connector, the alert unit connected to the voltage output connector, the power supply connected to the voltage input connector;

the voltage on the cathode of the diode actuating the transformer chip, the transformer chip transforming an electric potential of the power supply into an electric potential output to the alert module to actuate the alert module.

8. The electrostatic protector as claimed in claim 7, wherein the alert module includes a light emitting diode (LED) connected to the voltage output connector, the LED actuated to emit light by the electric potential output by the transformer chip.

9. The electrostatic protector as claimed in claim 8, wherein the alert module further includes a resistor connected to the LED to limit currents passing through the LED when the LED is actuated.

10. The electrostatic protector as claimed in claim 7, wherein the transformer unit further includes a first capacitor and a second capacitor, the first capacitor having one pole connected to the power supply and another pole grounded, and the second capacitor having one pole connected to the voltage output connector and another pole grounded.

11. An electrostatic protector for use in a portable electronic device, comprising:

an electrostatic conducting unit;

an electrostatic protecting unit connected to the electrostatic conducting unit, the electrostatic protecting unit including at least one protecting circuit, each protecting circuit including a diode, the diode having a cathode connected to the electrostatic conducting unit and a grounded anode;

wherein the electrostatic protector is configured such that electrostatic charges on a portable electronic device are transmitted to the electrostatic conducting unit and generate a voltage on the cathode of the diode to break down the diode, such that the electrostatic charges are transmitted to the ground by the broken down diode and the voltage on the cathode of the diode is reduced.

12. The electrostatic protector as claimed in claim 11, wherein the diode is a transient voltage suppressor (TVS) diode.

13. The electrostatic protector as claimed in claim 11, wherein the electrostatic conducting unit includes metal portions formed on the housing of the portable electronic device.

14. The electrostatic protector as claimed in claim 13, wherein the electrostatic conducting unit includes a dust-proof net of the portable electronic device and a keypad of the portable electronic device, and the electrostatic protecting unit includes two protecting circuits respectively connected to the dust-proof net and the keypad.