Hysteresis characteristic input circuit including resistors capable of suppressing penetration current

1. A hysteresis characteristic input circuit, comprising:

first and second power supply terminals;

first and second resistors connected in parallel between said first power supply terminal and a connection point;

first and second MOS transistors connected in parallel between said connection point and said second power supply terminal, said first and second MOS transistors being controlled by an input voltage;

an inverter having an input connected to said connection point and an output adapted to generate an output voltage;

a first switching element connected in series between said second resistor and said first power supply terminal; and

a second switching element connected in series between said second MOS transistor and said connection point,

wherein said first and second switching elements are complementarily controlled by said output voltage.

2. The hysteresis characteristic input circuit as set forth in claim 1 , wherein a voltage at said first power supply terminal is higher than a voltage at said second power supply terminal,

wherein said first and second MOS transistors each comprises an n-type conductivity type transistor,

wherein said first switching element comprises a p-channel MOS transistor, and

wherein said second switching element comprises an n-channel MOS transistor.

3. The hysteresis characteristic input circuit as set forth in claim 1 , wherein a voltage at said first power supply terminal is lower than a voltage at said second power supply terminal,

wherein said first and second MOS transistors comprise a p-type conductivity type transistor,

wherein said first switching element comprises an n-channel MOS transistor, and

wherein said second switching element comprises a p-channel MOS transistor.

4. An ON/OFF circuit for a DC stabilized power supply apparatus comprising the hysteresis characteristic input circuit as set forth in claim 1 .

5. The ON/OFF circuit for a DC stabilized power supply apparatus as set forth in claim 4 , wherein said DC stabilized power supply apparatus is adapted to generate a stabilized positive voltage.

6. The ON/OFF circuit for a DC stabilized power supply apparatus as set forth in claim 4 , wherein said DC stabilized power supply apparatus is adapted to generate a stabilized negative voltage.

7. The hysteresis characteristic input circuit as set forth in claim 1 , wherein a resistance value of the first and second resistors is 5 MΩ or greater.

8. The hysteresis characteristic input circuit as set forth in claim 1 , wherein, when the second power supply is low, the first switching element is turned ON and the second switching element and the first and second MOS transistors are turned OFF.

9. Tim hysteresis characteristic input circuit as set forth in claim 1 , wherein, when the second power supply is higher than a threshold voltage of the first and second MOS transistors, the first switching element and the first and second MOS transistors are turned ON and the second switching element is turned OFF.

10. The hysteresis characteristic input circuit as set forth in claim 1 , wherein, when the second power supply reaches a high level threshold voltage, an output of the inverter is switched.

11. The hysteresis characteristic input circuit as set forth in claim 10 , wherein, when the output of the Inverter is switched, the first switching element is turned OFF and the second switching element is turned ON.

12. The hysteresis characteristic input circuit as set forth in claim 10 , wherein, when the output of the inverter Is switched, a penetration current flows through the first resistor.

13. The hysteresis characteristic input circuit as set forth in claim 9 , wherein, when the output of the inverter is switched, a penetration current flows through the first resistor and the second resistor.