TPMS transmission module having power saving function
Disclosed herein is a TPMS transmission module having a power saving function, the TPMS transmission module including: a micom outputting a switch turn-off control signal when a vehicle having the TPMS transmission module mounted therein is stopped; a switch supplying a power when the switch is turned on and blocking the supply of the power when it is turned off; an energy generator generating and outputting an electric power when a tire rotates; and a switch controller turning on the switch when the electric power of a predetermined voltage or more is generated in the energy generator and turning off the switch when a switch turn off control signal is output from the micom.
1. A TPMS transmission module having power saving function, the TPMS transmission module comprising:
a micom transmitting a sensed tire state and outputting a switch turn-off control signal when a vehicle having the TPMS transmission module mounted therein is stopped;
a switch supplying a power of a power supply to the micom when the switch is turned on and blocking the supply of the power to the micom when it is turned off;
an energy generator generating and outputting an electric power when a wheel of the vehicle rotates, the wheel having the energy generator mounted thereon; and
a switch controller turning on the switch when the electric power of a predetermined voltage or more is generated in the energy generator, maintaining the switch in a turn-on state when the micom is being operated, and turning off the switch when a switch turn off control signal is output from the micom.
2. The TPMS transmission module as set forth in claim 1 , wherein the switch is a P-MOSFET having a source connected to the power supply, a drain connected to the micom, and a gate connected to the switch controller, and
the switch controller turns on the P-MOSFET by applying the electric power of a predetermined voltage or more to the gate thereof when the electric power of a predetermined voltage or more is generated in the energy generator, maintains the P-MOSFET in a turn-on state when the micom is being operated, and turns off the P-MOSFET by applying the electric power of a predetermined voltage or less to the gate thereof when the switch turn off control signal is output from the micom.
3. The TPMS transmission module as set forth in claim 1 , wherein the energy generator includes:
a housing;
a loading mass; and
a piezoelectric element having a first end fixed to the housing and a second end coupled to the loading mass, and
wherein the piezoelectric element and the loading mass coupled thereto are influenced by gravity when the wheel is rotating to thereby generate the electric power.
4. The TPMS transmission module as set forth in claim 1 , wherein the switch controller includes:
a first resistor connected between the power supply and the switch;
an N-MOSFET having a drain connected to the switch and a source connected to a ground; and
a second resistor connected between a gate of the N-MOSFET and the micom in series, and
wherein the N-MOSFET turns on the switch when the electric power of a predetermined voltage or more is applied from the energy generator thereto, maintains the switch in a turn-on state when the micom is being operated, such that the electric power of a predetermined voltage or more is applied from the micom to the gate thereof through the second resistor, and turns off the switch when the vehicle having the TPMS transmission module mounted therein is stopped, such that the electric power of a predetermined voltage or less is applied from the micom to the gate thereof through the second resistor.
5. The TPMS transmission module as set forth in claim 4 , wherein the sensor module includes:
a pressure sensor sensing pressure; and
a temperature sensor sensing temperature.