# US 7,612,663 B2 · Power saving device for GPS device

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- Number: US 7,612,663 B2
- Document ID: US7612663B2
- Status: Granted
- Kind: B2
- Application number: 11/641,836
- Filed: 2006-12-20
- Published: 2007-06-28
- Granted: 2009-11-03
- Earliest claimed: 2005-12-23
- Assignees: Kinpo Electrnics, Inc.
- Inventors: Chun-I Sun
- Web page: https://patentgrep.com/patent/US7612663B2

## CPC

- G01S 19/34: Power consumption
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

A power saving device for a GPS device is to utilize acceleration of gravity sensor to continue detecting the acceleration variation of the GPS device; if an acceleration value is larger than a threshold value, a GPS signal receiver is then started; if the acceleration value is smaller than the threshold value, the GPS signal receiver is then shut. This allows the GPS device to be power saving and not need to facilitate an extra oscillation switch therein to save the production cost.

## Claims

### Claim 1

A power saving device for a GPS device comprising:
a microprocessor;
an acceleration of gravity sensor (G-sensor) electrically connected to said microprocessor;
a first transistor electrically connecting with said G-sensor;
a time delay controller electrically connecting with said first transistor for communicating with said G-sensor and further comprising a second transistor, a capacitor and a resistor;
a power controller electrically connected to said time delay controller and said first transistor for communicating with said G-sensor;
a GPS receiver electrically connecting with said power controller; and
an information record and/or an output device electrically connecting with said time delay controller and said GPS receiver;
wherein said microprocessor offers said G-sensor a threshold value via a transmission interface of said microprocessor; said G-sensor creates an acceleration value based on a state of movement thereof, detects if said acceleration value is beyond said threshold value, outputs a starting signal to said power controller via said first transistor when said acceleration value is beyond said threshold value, and stops outputting said starting signal when said acceleration value is below said threshold value such that said power controller is capable of receiving said starting signal and starting said GPS receiver with respect to said state of the movement automatically for controlling said power source and saving a power consumption.

### Claim 2 (depends on 1)

The power saving device according to claim 1, wherein said G-sensor is electrically connected to the base of said first transistor, said power controller is electrically connected to the emitter of said first transistor, and a power source is electrically connected to the collector of said first transistor such that said starting signal with a power source signal from said power source is transmitted to said power controller.

### Claim 3 (depends on 2)

The power saving device according to claim 2, wherein said time delay controller extends a time duration before said starting signal capable of reaching said power controller, extends a time duration before said power controller capable of outputting a control signal to said GPS receiver, and further extends a time duration before said GPS receiver capable of performing an action.

### Claim 4 (depends on 3)

The power saving device according to claim 3, wherein said resistor and said capacitor are electrically connected to said power controller and the emitter of said first transistor.

### Claim 5 (depends on 4)

The power saving device according to claim 4, wherein the emitter of said first transistor is electrically connected to the collector of said second transistor, which is further electrically connected to said resistor and said capacitor.

### Claim 6 (depends on 1)

The power saving device according to claim 1, wherein said time delay controller extends a time duration before said starting signal capable of reaching to said power controller, extends a time duration before said power controller capable of outputting a control signal to said GPS, and further extends a time duration before said GPS receiver capable of performing an action.