Patent ID: 9385186
Filing Date: 2016-07-05
CPC Classification: H01L,H02M,H03K

Claim Text:
1. A starting circuit, comprising: a negative threshold switching tube, an enabling module, an anti-intrusion module, and a voltage detecting module, wherein the negative threshold switching tube comprises: a high voltage device with composite structure that comprises: a drain, a source and a gate of the JFET of the high voltage device with composite structure are respectively an input terminal, an output terminal and a control terminal of the negative threshold switching tube; a high voltage input signal is connected to the input terminal of the negative threshold switching tube, the control terminal of the negative threshold switching tube is connected to an output terminal of the enabling module, an input terminal of the enabling module is connected to an output terminal of the voltage detecting module, an input terminal of the voltage detecting module and a power terminal of a chip are connected to an output terminal of the anti-intrusion module, the high voltage input signal is connected to the negative threshold switching tube, and provides energy to power terminal of the chip through the negative threshold switching tube, the voltage detecting module detects the voltage value of the power terminal of the chip, when the voltage value of the power terminal reaches a pre-determined operating voltage of the chip, the chip starts, meanwhile the voltage detecting module outputs an enabling signal; the enabling module receives the enabling signal, such that the negative threshold switching tube is cut off to turn off the negative threshold switching tube; the anti-intrusion module enables the unidirectional conduction between the input terminal of the negative threshold switching tube and the power terminal of the chip, to prevent the current in the power terminal from flowing back to the input terminal of the negative threshold switching tube.