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US 8,542,510 B2Granted
Power supply input device converting discharge resistance
AssigneeSamsung Electronics Co., Ltd.
InventorsJee-hoon Jung, Joong-gi Kwon
Life of this patent
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Abstract
A power supply input device including a first resistance of a discharge resistance conversion unit connected in parallel to a discharge resistance unit; and a switching unit of the discharge resistance conversion unit connected to the first resistance and performing a switching operation according to an externally received control signal, thus minimizing power losses occurring when a system is in a standby mode.
Claims4
A power supply input device including an alternating current (AC) power supply unit, a bridge diode unit, and a direct current (DC) condenser unit, comprising:
- a discharge resistance unit connected to both ends of the DC condenser unit and for discharging the DC condenser unit;
- and
- a discharge resistance conversion circuit for changing a discharge resistance value when a normal operation mode in which a system that receives power supply from the power supply input device normally operates is converted to a standby mode in which power supply is saved or when the standby mode is converted into the normal operation mode,
- wherein the discharge resistance conversion unit comprises:
- a first resistance connected in parallel to the discharge resistance unit and having a resistance value smaller than a resistance value of the discharge resistance unit;
- and
- a switching unit connected in series to the first resistance and turned on or off in such a way that the resistance value is changed according to a control signal having a voltage level varying whenever an operation mode of the system is converted,
- wherein the control signal turns on the switching unit in such a way that the discharge resistance decreases if the normal operation mode of the system is converted into the standby mode, and turns off the switching unit in such a way that the discharge resistance increases if the standby mode of the system is converted into the normal operation mode, wherein the control signal functions as a ground signal in the normal operation mode and as a high impedance signal in the standby mode, wherein the switching unit comprises:
- a bipolar junction transistor that has a collector connected to the first resistance;
- a second resistance connected between a base of the bipolar junction transistor and the first resistance and having a value so as to operate the bipolar junction transistor;
- a first photo coupler connected to the second resistance and the base of the bipolar junction transistor;
- and a third resistance connected to the first photo coupler.
9 more elements
A power supply input device including an alternating current (AC) power supply unit, a bridge diode unit, and a direct current (DC) condenser unit, comprising:
- a discharge resistance unit connected to both ends of the DC condenser unit and for discharging the DC condenser unit;
- and a discharge resistance conversion circuit for changing a discharge resistance value when a normal operation mode in which a system that receives power supply from the power supply input device normally operates is converted to a standby mode in which power supply is saved or when the standby mode is converted into the normal operation mode, wherein the discharge resistance conversion unit comprises:
- a first resistance connected in parallel to the discharge resistance unit and having a resistance value smaller than a resistance value of the discharge resistance unit;
- and a switching unit connected in series to the first resistance and turned on or off in such a way that the resistance value is changed according to a control signal having a voltage level varying whenever an operation mode of the system is converted, wherein the control signal turns on the switching unit in such a way that the discharge resistance decreases if the normal operation mode of the system is converted into the standby mode, and turns off the switching unit in such a way that the discharge resistance increases if the standby mode of the system is converted into the normal operation mode, wherein the control signal functions as a ground signal in the normal operation mode and as a high impedance signal in the standby mode,
- wherein the switching unit comprises:
- a MOSFET (metal-oxide semiconductor field effect transistor) connected to the first resistance;
- a second resistance connected to a gate of the MOSFET;
- a third resistance connected to the second resistance and having a resistance value so as to operate the MOSFET;
- a second photo coupler connected to the second and third resistances;
- and
- a fourth resistance connected to the second photo coupler.
8 more elements
Dependencies are inferred from the claim text.