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

Claim 1:
2. The low-voltage startup circuit according to claim 1, wherein the substrate voltage control module comprises:
a first transistor, a first resistor and a second transistor that are connected in series between the input voltage and the ground in sequence, wherein an intermediate node coupled between the first resistor and the second transistor is connected to a substrate of the main switching transistor,
wherein a gate of the first transistor and a gate of the second transistor are configured to receive the voltage detection signal,
wherein the first transistor is configured to charge the substrate of the main switching transistor according to the input voltage when the first transistor is turned on, and the second transistor is configured to discharge the substrate of the main switching transistor when the second transistor is turned on.