Switching Power Supply Using in Device Having High Peak Current Characteristic

摘要

A switching power supply is provided and connected between external voltage source and a device having high peak current characteristic, the switching power supply comprises boost converter, control circuit and energy storing element. An input end of boost converter is connected to external voltage source, and output end of boost converter is electrically connected to the device. A control circuit is connected to boost converter in parallel. A first predetermined voltage value and a predetermined current value is set in control circuit. When output current of external voltage source is larger than predetermined current value or output voltage of external voltage source is lower than first predetermined voltage value, output voltage of boost converter is reduced to be lower than the voltage of energy storing element by control circuit.

主权项

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.