Secondary power supply for telematics terminal

• US 20060173595A1
• Filed: 12/12/2005
• Published: 08/03/2006
• Est. Priority Date: 12/13/2004
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Ma, Jin-Suk, Kim, Sun-Ja
• Granted Patent: US 7,260,457 B2
• Time in Patent Office: Days
• US Class Current: 701/36
• CPC Class Codes: H02J 9/061 for DC powered loads

Abstract

The present invention provides a secondary power supply for the telematics terminal. A secondary power supply for a telematics terminal including: a power control unit for controlling a power supply based on a power control signal of the telematics terminal and/or a start-up key signal; a telematics control unit which is operated by power supplied from a secondary power supply unit under the control of the power control unit and controls each of components inside the telematics terminal; the secondary power supply unit for supplying the power to the telematics control unit; and a rectifying unit for rectifying power from a main power supply unit one more time and protecting the components from a reverse voltage by opening the connection of the main power supply unit and the secondary power supply unit when a voltage level of the secondary power supply unit is higher than that of the main power supply unit.

Claims

1. A secondary power supply for a telematics terminal, comprising:

a power control unit for controlling a power supply based on a power control signal of the telematics terminal and/or a start-up key signal coupled from the outside;

a telematics control unit which is operated by power supplied from a secondary power supply unit under the control of the power control unit and controls each of components inside the telematics terminal;

the secondary power supply unit for supplying the power to the telematics control unit; and

a rectifying unit for rectifying power from a main power supply unit one more time and protecting the components from a reverse voltage by opening the connection of the main power supply unit and the secondary power supply unit when a voltage level of the secondary power supply unit is higher than that of the main power supply unit.

2. The secondary power supply as recited in claim 1, wherein the power control unit includes:

a driving control sector for outputting a driving control signal based on a combination result of the stat-up key signal and the power control signal; and

a driving sector for driving the telematics control unit in response to the driving control signal from the driving control sector.

3. The secondary power supply as recited in claim 2, wherein the driving sector has:

a transistor being turned on in response to the driving control signal to thereby flow an electrical current to a relay coil;

a resistor, located between the driving control sector and the transistor, for flowing the electrical current in order to transmit the driving control signal;

the relay coil for turning on a switch by flowing an induced current when the transistor is turned on;

the switch for providing power to the telematics control unit in response to the induced current of the relay coil; and

a diode for protecting the transistor from a counter electromotive force induced in the relay coil when the switch is turned off.

4. The secondary power supply as recited in claim 2, wherein the driving control signal outputted from the driving control sector is produced as follows,

S_out=((S_—

in1+S_—

in2)·

({overscore (S_—

in3)})+(S_—

in4·

{overscore (S_—

in5)})),

wherein S_in1 is a running signal of a start-up key;

S_in2 is a start signal of the start-up key;

S_in3 is an off signal of the start-up key;

S_in4 is a power-on signal of the telematics terminal;

S_in5 is a power-off signal of the telematics terminal; and

S_out is the driving control signal.