Patent ID: 9525343
Filing Date: 2016-12-20
CPC Classification: H02M

Claim Text:
1. A switching power supply, connected between an external voltage source and at least a device having high peak current characteristic, the switching power supply comprising: a boost converter, an input end of the boost converter electrically connected to the external voltage source, and an output end of the boost converter electrically connected to the device having the high peak current characteristic; a control circuit connected to the boost converter in parallel, the control circuit configured to sense the output voltage of the external voltage source, the control circuit having a setting of a first predetermined voltage value and a predetermined current value; a charging circuit, an input end of the charging circuit connected to an output end of the boost converter; a discharging circuit, an output end of the discharging circuit electrically connected to the device having the high peak current characteristic; and an energy storing element, an output end of the energy storing element connected to an input end of the discharging circuit and an output end of the charging circuit; wherein, when the output current of the external voltage source is larger than the predetermined current value or the output voltage of the external voltage source is lower than the first predetermined voltage value, the output voltage of the boost converter is reduced quickly until being lower than the output voltage of the energy storing element by the control circuit.