POWER SUPPLY ADAPTOR
First Claim
1. A power supply adapter configured to receive an AC voltage, to convert the AC voltage thus received into a DC voltage, and to supply the DC voltage thus converted to an electronic device, the power supply adapter comprising:
- a plug configured to receive the AC voltage in a state in which it is plugged into a receptacle;
a rectifier circuit configured to rectify the AC voltage supplied via the plug;
a smoothing capacitor configured to smooth the voltage rectified by the rectifier circuit;
a DC/DC converter configured to receive the voltage smoothed by the smoothing capacitor, and to convert the voltage thus received into a DC voltage having a level to be supplied to the electronic device;
a device-side connector configured to be connected to the DC/DC converter via a cable, to be detachably connected to the electronic device, and to supply the DC voltage to the electronic device in a state in which it is connected to the electronic device,wherein the device-side connector comprises a detection unit configured to detect whether or not the electronic device is connected to the device-side connector, and to generate a connection detection signal which indicates whether or not the electronic device is connected to the device-side connector,and wherein the DC/DC converter comprises a control circuit configured to be connected to the detection unit of the device-side connector via the cable, to be set to an operating state when the connection detection signal indicates that the electronic device is connected, and to be set to a non-operating state when the connection detection signal indicates that the electronic device is not connected.
1 Assignment
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Accused Products
Abstract
A power supply adapter receives an AC voltage, converts the AC voltage into a DC voltage, and supplies the DC voltage to an electronic device. A DC/DC converter converts the voltage smoothed by a smoothing capacitor into the DC voltage. A device-side connector is connected to the DC/DC converter via a cable, and is configured to be detachably connected to the electronic device. The device-side connector includes a detection unit detecting whether or not the electronic device is connected, and generates a connection detection signal indicating whether or not the electronic device is connected. A control circuit of the DC/DC converter is connected to the detection unit of the device-side connector via the cable, and is set to an operating state when the connection detection signal indicates that the electronic device is connected, and is set to a non-operating state when the connection detection signal indicates that the electronic device is not connected.
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Citations
23 Claims
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1. A power supply adapter configured to receive an AC voltage, to convert the AC voltage thus received into a DC voltage, and to supply the DC voltage thus converted to an electronic device, the power supply adapter comprising:
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a plug configured to receive the AC voltage in a state in which it is plugged into a receptacle; a rectifier circuit configured to rectify the AC voltage supplied via the plug; a smoothing capacitor configured to smooth the voltage rectified by the rectifier circuit; a DC/DC converter configured to receive the voltage smoothed by the smoothing capacitor, and to convert the voltage thus received into a DC voltage having a level to be supplied to the electronic device; a device-side connector configured to be connected to the DC/DC converter via a cable, to be detachably connected to the electronic device, and to supply the DC voltage to the electronic device in a state in which it is connected to the electronic device, wherein the device-side connector comprises a detection unit configured to detect whether or not the electronic device is connected to the device-side connector, and to generate a connection detection signal which indicates whether or not the electronic device is connected to the device-side connector, and wherein the DC/DC converter comprises a control circuit configured to be connected to the detection unit of the device-side connector via the cable, to be set to an operating state when the connection detection signal indicates that the electronic device is connected, and to be set to a non-operating state when the connection detection signal indicates that the electronic device is not connected. - View Dependent Claims (2, 3, 4)
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5. A control circuit of a DC/DC converter included as a built-in component in a power supply adapter configured to receive an AC voltage, to convert the AC voltage thus received into a DC voltage, and to supply the DC voltage thus converted to an electronic device, the control circuit comprising:
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an enable terminal configured to receive a connection detection signal from a device-side connector configured to be connected to the DC/DC converter via a cable, and to be detachably connected to the electronic device, and to supply the DC voltage to the electronic device in a state in which the enable terminal is connected to the electronic device, and including a detection unit configured to detect whether or not the electronic device is connected, and to generate a connection detection signal which indicates whether or not the electronic device is connected; and a control unit configured to be set to an operating state in which an output voltage of the DC/DC converter is stabilized by means of a feedback operation when the connection detection signal indicates that the electronic device is connected, and to be set to a non-operating state in which the control operation of the DC/DC converter is stopped when the connection detection signal indicates that the electronic device is not connected. - View Dependent Claims (6)
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7. A device-side connector configured to be detachably connected to an electronic device having a power supply terminal configured to receive a DC voltage, the device-side connector comprising:
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a power source terminal configured to receive a DC voltage via a cable from a DC/DC converter included in the power supply adapter, and arranged such that the power source terminal faces and is connected to the power supply terminal in a state in which the device-side connector is connected to the electronic device; and a detection unit configured to detect whether or not the electronic device is connected to the device-side connector, and to generate a connection detection signal which indicates whether or not the electronic device is connected, wherein the connection detection signal is supplied to a control circuit of the DC/DC converter via the cable. - View Dependent Claims (8, 9, 10)
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11. An electronic device configured to operate receiving an AC voltage, and to be switchable between a normal operating mode and a standby mode, the electronic device comprising:
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a plug configured to receive the AC voltage in a state in which it is plugged into a receptacle; a rectifier circuit configured to rectify the AC voltage supplied via the plug; a smoothing capacitor configured to smooth the voltage rectified by the rectifier circuit; a DC/DC converter configured to receive the voltage smoothed by the smoothing capacitor, and to convert the voltage thus smoothed into a DC voltage having a predetermined level; a control circuit configured to receive the smoothed voltage via a power supply terminal thereof, to control the DC/DC converter such that the output voltage of the DC/DC converter is maintained at a constant level, and to be switchable between an operating state and a non-operating state according to a control signal input to an enable terminal thereof; an activation switch configured to receive an instruction to switch the mode of the electronic device from the standby mode to the normal operating mode; a standby switch configured to receive an instruction to switch the mode of the electronic device from the normal operating mode to the standby mode; and a signal processing unit configured to receive the output voltage of the DC/DC converter via a power supply terminal thereof, to perform predetermined signal processing when the electronic device is in the normal operating mode, to monitor the standby switch, and to output, to the enable terminal of the control circuit, a control signal which indicates whether or not the electronic device is in the normal operating mode or in the standby mode. - View Dependent Claims (12)
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13. A DC/DC converter comprising:
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a transformer comprising a primary coil, a secondary coil, and an auxiliary coil arranged on the primary coil side; a first output capacitor arranged such that one terminal thereof is set to a fixed electric potential; a first diode arranged between the other terminal of the first output capacitor and one terminal of the secondary coil such that the cathode thereof is on the first output capacitor side; a switching transistor arranged on a path of the first primary coil; a second output capacitor arranged such that one terminal thereof is set to a fixed electric potential; a second diode and a mask switch arranged in series between the other terminal of the second output capacitor and one terminal of the auxiliary coil switch such that the cathode of the second diode is on the second output capacitor side; and a control circuit configured to receive, via a power supply terminal thereof, a voltage that develops at the second output capacitor, and to control an on/off operation of the switching transistor. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification