Power supply circuit and power supply method for switching power supply
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
May 6, 2016
filing date -
May 19, 2015
priority date (Note) -
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Abstract
A power supply circuit for a switching power supply including a power switch configured to receive a DC input voltage, can include: a switching control circuit configured to receive a charge voltage signal of a charge capacitor, a reference voltage signal, and a PWM control signal, and to generate a switching control signal; a control unit having a supply voltage from the charge capacitor, where the charge capacitor includes a first terminal coupled to the switching control circuit, and a second terminal coupled to ground; and where when the switching power supply is in a start-up phase, the power switch is turned on, the first switch is turned off, and the DC input voltage charge the charges capacitor through the power switch, and the control unit begins operating when the charge voltage signal reaches a level of starting voltage of the control unit.
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