| 摘要 |
There is provided a power supply apparatus that can raise the power supply efficiency while an appliance in which the power supply apparatus is installed is in a standby state, with a simple construction, without performing complicated control, and can reliably achieve improved power consumption due to the raise in the power supply efficiency, as well as noise reduction. According to the power supply unit, Conduction and interruption of a current flowing in the primary winding 103 of the transformer T21 is controlled. A voltage generated in the secondary winding 104 of the transformer T21 is rectified and smoothed by the rectifier and smoothing circuit 101. An output voltage of the rectifier and smoothing circuit 101 is compared with a reference voltage and a voltage corresponding to a difference between the output voltage and the reference voltage is outputted by error detection circuit 102. An output from the error detection circuit 102 is transferred from the secondary side to primary side of the optocoupler PC21. An intermittent pulse signal is generated for forcibly reducing a signal level supplied to the optocoupler PC21 for the period of the pulse being sufficient for stopping oscillation of the power supply apparatus irrespective of a result of the comparison of the error detection circuit 102.
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