Patent ID: 9577617
Date: 2017-02-21
CPC Classifications: H03K

Claim:
1. A level conversion circuit, comprising: a first equivalent diode, a first switching transistor, a second switching transistor, a second equivalent diode, a first capacitor, and a second capacitor, wherein a cathode of the first equivalent diode is connected to a first reference voltage, and an anode of the first equivalent diode is separately connected to a gate of the first switching transistor and a first end of the first capacitor, a first end of the first switching transistor is connected to a second reference voltage, and both a second end of the first switching transistor and a first end of the second switching transistor are connected to an output voltage, both a second end of the first capacitor and a first end of the second capacitor are connected to an input voltage, a second end of the second capacitor is separately connected to a cathode of the second equivalent diode and a gate of the second switching transistor, and a second end of the second switching transistor is grounded, and an anode of the second equivalent diode is connected to a third reference voltage, and wherein the input voltage is switched between zero and a first voltage; V when the input voltage is zero, the anode and the cathode of the first equivalent diode are cut off, and the anode and the cathode of the second equivalent diode are conducted; and when the input voltage changes from zero to the first voltage, the anode and the cathode of the first equivalent diode are conducted, an absolute value of a voltage difference between the gate and the first end of the first switching transistor is not greater than the threshold voltage of the first switching transistor, and the first end and the second end of the first switching transistor are cut off, a voltage difference between the anode and the cathode of the second equivalent diode is not greater than the conduction voltage drop of the second equivalent diode, and the anode and the cathode of the second equivalent diode are cut off, and an absolute value of a voltage difference between the gate and the second end of the second switching transistor is greater than the threshold voltage of the second switching transistor, and the first end and the second end of the second switching transistor are conducted, so that the output voltage is zero.