Power supply controlling device of an electronic equipment
AssigneeSamsung Electronics Co., Ltd.
InventorsJung-hwan Kim, Kyung-chool Choi
Life of this patent
Estimating the term…
Abstract
A system connecting a printer and a host computer includes a signal processing unit, a printing unit, a DC/DC converter converting a power supply voltage into a lower voltage required by the signal processing unit and outputting the converted voltage to the signal processing unit, an input unit receiving a printing command, and a power supply controlling device. The power supply controlling device includes a first switching unit, a pulse width modulating unit, a power supply switch providing a power on/off signal from a user, and a power supply controlling unit outputting a control signal to the pulse width modulating unit to control the first switching unit to perform an on/off operation corresponding to the power on/off signal from the user.
Claims25
A power supply controlling device of an electronic equipment, comprising:
- a first rectifying unit rectifying an alternating voltage supplied from a power supply cord and outputting a first rectified voltage;
- a transformer comprising a primary winding wired to receive the first rectified voltage from the first rectifying unit, and a secondary winding coupled to the primary winding;
- a first switching unit performing an on/off operation by supplying current to the primary winding;
- a pulse width modulating unit controlling the on/off operation of the first switching unit;
- and
- a power supply controlling unit outputting a signal controlling the pulse width modulating unit, wherein the pulse width modulating unit switches the first switching unit to on/off depending on a reception of a power-on signal which is supplied externally, wherein the power supply controlling unit comprises:
- a USB interface unit;
- a power supply switch selecting a power on/off signal in response to a power on/off signal received from a host computer connected through the USB interface unit and outputting a trigger signal indicative thereof;
- a second switching unit connected to a power supply terminal of the USB interface unit and turned on based on the trigger signal from the power supply switch;
- and
- a photo coupler comprising a first light emitting device and a phototransistor applying a signal to the pulse width modulating unit, wherein the first light emitting device is connected to the second switching unit and disposed to emit the light in response to the turn-on signal of the second switching unit, and the signal corresponds to an emission of light emitting from the first light emitting device.
A power supply controlling device, comprising:
- a first switching unit;
- a pulse width modulating unit;
- a power supply switch providing a power on/off signal from a user;
- a power supply controlling unit outputting a control signal to the pulse width modulating unit to control the first switching unit to perform an on/off operation corresponding to the power on/off signal from the user or from a host computer by way of a USB interface unit;
- a second switching unit performing a turn-on operation according to the power on/off signal;
- and
- a photo coupler connected to the second switching unit, wherein the photo coupler comprises
- a first light emitting device to emit a light in response to the turn-on operation of the second switching unit,
- a phototransistor to provide the pulse width modulating unit with a signal that corresponds to the emission of the light from the first light emitting device, and
- an auxiliary power supply to supply power to the second switching unit.
A system connecting a printer and a host computer, comprising:
- a signal processing unit comprising a USB interface unit to control the printer;
- a printing unit;
- a DC/DC converter converting a power supply voltage into a lower voltage required by the signal processing unit, and outputting the converted voltage to the signal processing unit;
- an input unit receiving a printing command;
- and
- a power supply controlling device comprising
- a first switching unit,
- a pulse width modulating unit,
- a power supply switch providing a power on/off signal from a user, and
- a power supply controlling unit outputting a control signal to the pulse width modulating unit to control the first switching unit to perform an on/off operation corresponding to the power on/off signal from the user, wherein the signal processing unit receives a power-on signal from the host computer through the USB interface unit or from the power supply switch.
A power supply controlling device, comprising
- a first switching unit;
- a pulse width modulator unit;
- a power supply controlling unit outputting a control signal to the pulse width modulator unit to control the first switching unit to perform an on/off operation corresponding to a power on/off signal received from a host computer connected through a USB interface unit and outputting a trigger signal indicative thereof,
- wherein the power supply controlling unit further comprises a second switching unit connected to a power supply terminal of the USB interface unit and turned on based on the trigger signal from the power supply switch.
Dependencies are inferred from the claim text.