Patent ID: 9166497
Filing Date: 2015-10-20
Classification: H02M,Y02B

Abstract:
1. A switching power source device comprising: a switching power supply main body that switches an input voltage via a switching element to obtain a predetermined DC output voltage; a control circuit that performs on/off-driving of the switching element; and a capacitor that is connected to the control circuit to be charged by an external power supply via an activation switch circuit during activation and that is charged by a voltage generated in the switching power supply main body after completion of activation to supply a control power voltage to the control circuit, the control circuit comprising: a latch circuit that is set according to a latch signal emitted when an abnormality is detected, to stop the driving of the switching element; a discharge circuit that receives the latch signal to be turned on and discharges charges accumulated in the capacitor; and a comparator that resets the latch circuit when the control power voltage decreases to an operation stop voltage.