Patent ID: 11870344
Assignee: EGALAX_EMPIA TECHNOLOGY INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 5:
6. A detection method of a voltage doubler switched capacitor circuit capable of detecting a short circuit of a flying capacitor, comprising the steps of:
A: using a first switch with a larger impedance of the voltage doubler switched capacitor circuit for a soft start;
B: turning on the first switch to disconnect a second switch and a third switch, so that a main voltage source charges a stabilizing capacitor;
C: using a timer of a detection circuit to determine whether a charging time of the main voltage source for the stabilizing capacitor is less than a preset time, if yes, going to step D; if not, going to step H;
D: determining whether a divided voltage of a voltage output terminal is greater than a second reference voltage of a second comparator;
E: turning on the second switch and turning off the third switch, so that the main voltage source charges the flying capacitor, and the flying capacitor stores a voltage difference as a voltage of the main voltage source;
F: turning on the second switch and the third switch to let the voltage of the main voltage source of the flying capacitor be discharged to the stabilizing capacitor connected between the voltage output terminals, so that the voltage output terminal is doubled the voltage of the main voltage source;
G: determining whether the divided voltage of one of the voltage output terminals is greater than a first reference voltage of a first comparator, if yes, going to step I; if not, going to step E;
H: turning off a charging pulse and issuing a short-circuit warning;
I: turning off the charging pulse.