POWER SUPPLY ADAPTOR, CONTROL CIRCUIT FOR DC-DC CONVERTER, APPARATUS-SIDE CONNECTOR, DC-DC CONVERTER, POWER SUPPLY DEVICE USING DC-DC CONVERTER, AND ELECTRONIC APPARATUS

摘要

Disclosed is a power supply adaptor (100), which receives an alternating current voltage (Vac), converts the voltage into a direct current voltage (Vdc), and supplies the converted voltage to an electronic apparatus (1). A DC-DC converter (16) converts a voltage (Vs) smoothed by the smoothing capacitor (C1) into a direct current voltage (Vdc). An apparatus-side connector (22) is connected to the DC-DC converter (16) via a cable (20), and is configured such that the connector can be attached to and removed from an electronic apparatus (1). The apparatus-side connector (22) includes a detecting section (24), which detects whether the electronic apparatus (1) is connected or not, and generates connection detection signals (S1) which indicate whether the electronic apparatus is connected or not. A control circuit (30) for the DC-DC converter (16) is connected to the detecting section (24) of the apparatus-side connector (22) via the cable (20), and is configured to be in an operating state when a connection detection signal (S1) indicates that the electronic apparatus (1) is connected, and to be in a non operating state when a connection detection signal (S1) indicates that the electronic apparatus (1) is not connected.