Electromagnetic induction switch circuit

• US 7,492,567 B2
• Filed: 06/04/2007
• Issued: 02/17/2009
• Est. Priority Date: 12/26/2006
• Status: Expired due to Fees

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Hsieh, Ming-Chih
• Primary Examiner(s): Leja; Ronald W
• Application Number:
  US11/757,403
• Publication Number:
  US 20080150498A1
• Time in Patent Office: 624 Days
• Field of Search: 361/147
• US Class Current: 361/147
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3215 Monitoring of peripheral devices
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: H01H 47/22 for supplying energising current for relay coil

Abstract

An exemplary electromagnetic induction switch includes a coil, a magnet suspended in the coil, a rectification circuit, and a relay-switch. The coil is connected between two input terminals of the rectification circuit. Two output terminals of the rectification circuit are respectively connected to two relay leads of the relay-switch. One of two switch leads of the relay-switch is connected to a working circuit, and another one of the switch leads of the relay-switch is connected to the working circuit via a power source, thereby controlling the power source supplying power to the working circuit.

Claims

1. An electromagnetic induction switch comprising:

a coil with two ends;

a magnet suspended within the coil;

a rectification circuit with two input terminals each respectively connected to a corresponding one of the ends of the coil, and two output terminals; and

a relay-switch with two relay leads respectively connected to the output terminals of the rectification circuit, and two switch leads, wherein one of the switch leads is connected to a working circuit, and another one of the switch leads is connected to the working circuit via a power source, thereby controlling the power source supplying power to the working circuit.

2. The electromagnetic induction switch as claimed in claim 1, further comprising a capacitor coupled between the two relay leads of the relay-switch.

3. An electronic device comprising:

a working circuit;

a power source connected to the working circuit configured for supplying power to the working circuit;

a relay-switch controlling the power source supplying power to the working circuit, the relay-switch comprising a relay portion and a switch portion;

a coil with a magnet suspended therein, during movement of the electronic device, the magnet moves relative to the coil so that the coil generates an alternating current; and

a rectification circuit comprising two input terminals connecting to two opposite terminals of the coil to receive the alternating current and converting it to a direct current, and two output terminals connecting to two opposite leads of the relay portion of the relay-switch to output the direct current to the relay portion to thereby short the switch portion of the relay-switch for allowing the power source to supply power to the working circuit.

4. The electronic device as claimed in claim 3, further comprising a capacitor coupled between the two relay leads of the relay portion of the relay-switch.

5. The electronic device as claimed in claim 3 is a laser pen.

6. The electronic device as claimed in claim 3 is a flashlight.

7. The electronic device as claimed in claim 3 is a microphone.