Power supply control circuit for use in vehicle equipment

Claim 2

A mobile telephone comprising: transmitter/receiver means; power supply means for supplying power to said transmitter/receiver means in response to an ignition voltage and to a power switch signal; emergency means for producing an emergency control signal; power switch control means responsive to said emergency control signal for producing said power switch signal and supplying it to said power supply means, and ignition voltage control means responsive to said emergency control signal for producing said ignition voltage and supplying it to said power supply means.

Claim 3

A mobile telephone as claimed in claim 1 further comprising: power switch means for manually producing said power switch signal; an ignition swich; means for producing said ignition voltage in response to the turning-on of said ignition switch.

Claim 4

A mobile telephone as claimed in claim 1, wherein said power supply means comprises: AND gate means receiving an inverted signal of said power switch signal and said ignition voltage to produce an AND output; and relay means responsive to said AND output for applying power to said transmitter/receiver means.

Claim 5

A mobile telephone as claimed in claim 1, wherein said power switch control means comprises: first resistor means one end of which is connected with the output of said emergency means; first transistor means whose base and emitter are connected with the other end of said first resistor means and with a terminal supplied with a predetermined voltage, respectively; second resistor means connected between the collector of said first transistor means and ground; third resistor means one end of which is connected with the collector of said first transistor means; second transistor means whose base and emitter are connected with the other end of said third resistor means and with the emitter of said first transistor means, respectively; fourth resistor means one end of which is connected with the collection of said second transistor; fifth resistor means connected between the other end of said fourth resistor means and ground; third transistor means whose base, emitter and collector are connected with said other end of said fourth resistor means, ground and the output of said power switch control means, respectively; and diode means whose anode and cathode are connected with ground and the collector of said third transistor means.

Claim 6

A mobile telephone as claimed in claim 4, wherein said predetermined voltage is five volts.

Claim 7

A mobile telephone as claimed in claim 4, wherein each of said first and second transistor means comprises a PNP transistor and wherein said third transistor means comprises a NPN transistor.

Claim 8

A mobile telephone as claimed in claim 1, wherein said ignition voltage control means comprises: first resistor means one end of which is connected with the output of said emergency means; second resistor means connected between the other end of said first resistor means and ground; first transistor means whose base and emitter are connected with said other end of said first resistor means and ground, respectively; third resistor means one end of which is connected with the collector of said first transistor means; second transistor means whose base, emitter and collector are connected with the other end of said third resistor means, the output of said ignition voltage control means and a terminal supplied with a predetermined voltage, respectively; and fourth resistor means connected between the base and emitter of said second transistor means.

Claim 9

A mobile telephone as claimed in claim 7, wherein said predetermined voltage is 12 volts.

Claim 10

A mobile telephone as claimed in claim 7, wherein said first transistor means comprises an NPN transistor and wherein said second transistor means comprises a PNP transistor.

Claim 11

A mobile telephone as claimed in claim 1, wherein said emergency means comprises: emergency switch means for manually producing an emergency switch signal; and emergency switch monitor means responsive to said emergency switch signal for producing said emergency control signal.

Claim 12

A mobile telephone as claimed in claim 10, wherein said emergency switch means comprises a non-lock type push-button.

Claim 13

A mobile telephone as claimed in claim 10, wherein said emergency switch monitor means comprises: first resistor means one end of which is connected with said emergency switch means; first diode means whose cathode and anode are connected with the other end of said first resistor and ground, respectively; second resistor means one end of which is connected with said cathode; third resistor means connected between the other end of said second resistor means and a terminal supplied with a predetermined voltage; capacitor means connected between said other end of said second resistor means and ground; first inverter means whose input is connected with said other end of said second resistor means; second inverter means whose input is connected with the output of said first inverter means; second diode means whose cathode is connected with the output of said second inverter means; depression detection means having first and second terminal, said first terminal being connected with the anode of said second diode, said depression detection means producing a high-level signal when a signal at said first terminal is low, and producing a low-level signal when a signal at said first terminal is low, said high- and low-level signals being supplied to said second terminal; fourth resistor means connected between said second terminal and ground; third inverter means whose input is connected with said second terminal, and NAND gate means whose two inputs are respectively connected with the outputs of said second and third inverter means and whose output is connected with the output of said emergency means to output said emergency control signal.

Claim 14

A mobile telephone as claimed in claim 12, wherein said predetermined voltage is five volts.

Claim 15

A power supply control circuit comprising: power supply means responsive to a power switch signal and to an ignition signal for supplying power to equipment; emergency switch means for manually producing an emergency switch signal; means responsive to said emergency switch signal for producing said power switch signal and supplying it to said power supply means; and means responsive to said emergency switch signal for producing said ignition signal and supplying it to said power supply means.

Claim 16

A power supply control circuit comprising: power supply means responsive to a power switch signal and to an ignition signal for supplying power to equipment; emergency switch means for manually producing an emergency switch signal; means responsive to said emergency switch signal for producing said power switch signal and supplying it to said power supply means; and means responsive to said emergency switch signal for producing said ignition signal and supplying it to said power supply means.

Claim 17

A circuit as claimed in claim 14, wherein said equipment comprises a mobile telephone.

Claim 18

A circuit as claimed in claim 15, wherein said mobile telephone comprises a handset including a power switch for manually producing said power switch signal and supplying it to said power supply means.

Claim 19

A vehicle electrical apparatus comprising: battery means; power supply means for applying power from said battery means to said apparatus in response to an ignition voltage and to a power switch signal; power switch means for manually producing said power switch signal and supplying it to said power supply means; ignition key means for producing said ignition voltage and supplying it to said power supply means; emergency means for producing an emergency control signal; power switch control means connected with said power switch means and responsive to said emergency control signal for producing said power switch signal and supplying it to said power supply means; and ignition voltage control means connected with said ignition key means and responsive to said emergency control signal for producing said ignition voltage and supplying it to said power supply means.

Claim 20

A vehicle electrical apparatus comprising: battery means; power supply means for applying power from said battery means to said apparatus in response to an ignition voltage and to a power switch signal; power switch means for manually producing said power switch signal and supplying it to said power supply means; ignition key means for producing said ignition voltage and supplying it to said power supply means; emergency means for producing an emergency control signal; power switch control means connected with said power switch means and responsive to said emergency control signal for producing said power switch signal and supplying it to said power supply means; and ignition voltage control means connected with said ignition key means and responsive to said emergency control signal for producing said ignition voltage and supplying it to said power supply means.

Claim 21

An apparatus as claimed in claim 17, wherein said emergency means comprises: emergency switch means for manually producing an emergency switch signal; and emergency switch monitor means responsive to said emergency switch signal for producing said emergency control signal.

Claim 22

An apparatus as claimed in claim 18, wherein said emergency switch means comprises a non-lock type push-button.

Claim 23

An apparatus as claimed in claim 17, further comprising first diode means whose anode and cathode are connected with said ignition switch key means and said power supply means, respectively; and second diode means whose anode and cathode are connected with the output of said ignition voltage control means and the cathode of said first diode means, respectively.

Claim 26

A method as claimed in claim 21 further comprising the following steps of: manually producing said power switch signal; and responsive to the turning-on of an ignition key, producing said ignition voltage.

Claim 27

A method as claimed in claim 21, wherein said step of generating an emergency switch signal comprises the steps of: manually producing a manual emergency switch signal; and responsive to said manual emergency switch signal, producing said emergency switch signal.

Claim 30

A method as claimed in claim 24 further comprising the step of manually producing said power switch signal.

Claim 31

A method as claimed in claim 24 further comprising the steps of: mounting said apparatus on a vehicle having a vehicle battery and an ignition key; responsive to the turning-on of said ignition key, producing said ignition signal.

Claim 32

A method as claimed in claim 26, wherein said step of supplying power comprises the step of supplying power from said vehicle battery to said apparatus.