Abnormal heavy current production preventing apparatus

An abnormal heavy current production preventing apparatus including:

• a power source battery;
• a DC/DC converter driven by said power source battery, said DC/DC converter transferring electrical energy stored in a coil to a capacitor in conformity with the repetitive switching operation of an FET transistor to thereby obtain a boosted output;
• power source switch means provided between said power source battery and said DC/DC converter,
• detecting means for detecting the gate voltage of said FET transistor;
• and
• control means for sending a power source OFF signal to said power source switch means when it is detected by said detecting means that the gate voltage of said FET transistor is at a predetermined value or higher at the timing when the gate voltage of said FET transistor should be at a low level.

An abnormal heavy current production preventing apparatus, comprising:

• a power source battery;
• an electrical load through which a relatively great load current flows;
• driving means for driving said electrical load;
• a power source switch provided between said power source battery and said electrical load;
• control means for controlling a control terminal of said driving means;
• and
• detecting means for detecting the voltage of said control terminal,
• wherein said control means opens said power source switch when, during non-operation, said detecting means detects that the voltage level of said control terminal is at a predetermined value or higher.

An abnormal heavy current production preventing apparatus, comprising:

• a power source battery;
• a DC/DC converter driven by said power source battery, said DC/DC converter obtaining an output boosted in conformity with the repetitive switching operation of an FET transistor;
• an electrical load to which the output boosted by said DC/DC converter is applied and through which a relatively great load current flows;
• power source switch means provided between said power source battery and said electrical load,
• detecting means for detecting the gate voltage of said FET transistor, said detecting means switch-operating said power source switch to thereby stop the driving of said DC/DC converter when it detects, except during the normal operation period of said DC/DC converter, that the gate voltage of said FET transistor is at a predetermined value or higher;
• and
• control means for sending a power source OFF signal to said power source switch means when it is detected by said detecting means that the gate voltage of said FET transistor is at a predetermined value or higher at the timing when the gate voltage of said FET transistor is at a low level.