Protection circuit
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorKentaro Watanabe
Life of this patent
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Abstract
In general, according to one embodiment, a protection circuit includes first and second power lines, first and second controllers, a first transistor, and a detector. The first controller includes a first resistor element, a capacitor, first, second, and third inverters. The second controller includes third transistor. One end of the third transistor is coupled to the second power line. The other end of the third transistor is coupled to each of the output end of the first inverter and the input end of the second inverter.
Claims17
A protection circuit comprising:
- a first power line;
- a second power line;
- a first controller including:
- a first resistor element, one end of the first resistor element being coupled to the first power line;
- a capacitor, one electrode of the capacitor being coupled to the second power line;
- a first inverter, an input end of the first inverter being coupled to each of the other end of the first resistor element and the other electrode of the capacitor;
- a second inverter, an input end of the second inverter being coupled to an output end of the first inverter;
- and
- a third inverter, an input end of the third inverter being coupled to an output end of the second inverter;
- a first transistor, a gate of the first transistor being coupled to an output end of the third inverter, one end of the first transistor being coupled to the first power line, and the other end of the first transistor being coupled to the second power line;
- a detector including:
- a diode string that includes a plurality of diodes coupled in series, an anode of each of the diodes being coupled on the first power line side, and an anode side end of the diode string being coupled to the first power line;
- and
- a second resistor element, one end of the second resistor being coupled to the second power line, and the other end of the second resistor being coupled to a cathode side end of the diode string;
- and
- a second controller including:
- a second transistor, a gate of the second transistor being coupled to each of the cathode side end of the diode string and the other end of the second resistor element, one end of the second transistor being coupled to the second power line;
- a third resistor element, one end of the third resistor element being coupled to the first power line;
- a fourth inverter, an input end of the fourth inverter being coupled to each of the other end of the second transistor and the other end of the third resistor;
- and
- a third transistor, a gate of the third transistor being coupled to an output end of the fourth inverter, one end of the third transistor being coupled to the second power line, and the other end of the third transistor being coupled to each of the output end of the first inverter and the input end of the second inverter.
A protection circuit comprising:
- a first power line;
- a second power line;
- a first transistor provided between the first power line and the second power line;
- and
- control circuitry that controls the first transistor based on a difference between a voltage of the first power line and a voltage of the second power line, wherein
- the control circuitry,
- in a case where a difference between a voltage of the first power line and a voltage of the second power line is smaller than a first voltage, controls the first transistor to be turned “ON” or “OFF”, and
- in a case where a difference between a voltage of the first power line and a voltage of the second power line is equal to or larger than the first voltage, controls the first transistor to be turned “OFF”.
Dependencies are inferred from the claim text.