Patent ID: 7667503
Filing Date: 2010-02-23
Classification: H03K

Abstract:
1. A semiconductor switching circuit with hysteresis comprising; a transistor, a first electrode of the transistor being connected to an electrical source via a load, a second electrode of the transistor being connected to a standard potential; and a driving circuit outputting a signal to a control electrode of the transistor on a basis of a potential in the first electrode of the transistor so as to turn on and off the transistor, the driving circuit turning on when an input voltage applied from an input terminal is a first voltage higher than a threshold voltage of the transistor, the driving circuit turning off when the input voltage is a second voltage lower than the threshold voltage of the transistor, wherein the driving circuit includes a first resistor, a second resistor, a third resistor, a first transistor and a second transistor, the first resistor being connected between the input terminal and the control electrode of the transistor, a first electrode of the first transistor being connected to the control electrode of the transistor via the second resistor, a second electrode of the first transistor being connected to the standard potential, a control electrode of the first transistor being connected to the first electrode of the transistor, the second transistor having an opposite conductive type to the first transistor, a first electrode of the second transistor being connected to the control electrode of the transistor via the third resistor, a second electrode of the second transistor being connected to the electrical source, a control electrode of the second transistor being connected to the first electrode of the transistor.