Switching power supply with internal power supply circuit
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United States of America Patent
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Jan 30, 2018
Issued Date -
N/A
app pub date -
Jan 28, 2016
filing date -
Feb 2, 2015
priority date (Note) -
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Abstract
A switching power supply includes a switching element that turns ON and OFF a current flowing through a primary coil of a transformer to which a DC input voltage is applied, an output circuit that rectifies and smooths a voltage induced in a secondary coil of the transformer T to generate a prescribed output voltage, and a control circuit that uses feedback control to turn the switching element ON and OFF according to a feedback voltage obtained from the detected output voltage. The switching power supply also includes a supply voltage generation circuit that rectifies and smoothes a voltage induced in an auxiliary coil of the transformer to generate a plurality of supply voltages, an output voltage switching circuit that switches the output voltage according to a magnitude of a load to which the output voltage is supplied, and a supply voltage switching circuit that selects one of the supply voltages according to changes to the output voltage and supplies that supply voltage to the control circuit.
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