Patent ID: 11929667
Assignee: SG MICRO CORP
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 2:
3. The low-voltage startup circuit according to claim 2, wherein the substrate voltage control module further comprises:
a third transistor, a second resistor and a fourth transistor that are connected in series between the input voltage and the ground in sequence, wherein an intermediate node of the second resistor and the fourth transistor is connected to a substrate of the first transistor,
wherein a gate of the third transistor and a gate of the fourth transistor receive an inverted signal of the voltage detection signal,
wherein the third transistor is configured to charge the substrate of the first transistor according to the input voltage when the third transistor is turned on, and the fourth transistor is configured to discharge the substrate of the first transistor when the fourth transistor is turned on.