Power supply circuit having low idle power dissipation
First Claim
Patent Images
1. A power supply arrangement, comprising:
- an off-line switched power supply configured to provide a regulated direct current (DC) power level at an output;
a DC regulator circuit configured to regulate the DC power level provided to a removable load coupled to the output;
a load detection circuit configured to provide a load detect signal when the removable load is detected to be present at the output;
a management circuit responsive to the load detect signal circuit; and
an ultra-low power switching power supply powered from an AC source, the ultra-low power switching power supply to provide power to the load detection circuit to detect the presence of the removable load, and the the ultra-low power switching power supply to provide power to the management circuit, which responsive to the detection of the removable load by the load detection circuit, enters an active state and causes the DC regulator circuit and the off-line switched power supply to each change to an active state and provide the regulated DC level to the removable load;
wherein the off-line switched power supply, the DC regulator circuit, and the management circuit each remain in a substantially “
off”
state while the load detection circuit does not detect the removable load.
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Accused Products
Abstract
Embodiments include a power supply arrangement where major components including an off-line switched power supply are shut off when not in use. When a load is coupled to the power supply arrangement, components are enabled so as to provide power to the load.
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Citations
20 Claims
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1. A power supply arrangement, comprising:
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an off-line switched power supply configured to provide a regulated direct current (DC) power level at an output; a DC regulator circuit configured to regulate the DC power level provided to a removable load coupled to the output; a load detection circuit configured to provide a load detect signal when the removable load is detected to be present at the output; a management circuit responsive to the load detect signal circuit; and an ultra-low power switching power supply powered from an AC source, the ultra-low power switching power supply to provide power to the load detection circuit to detect the presence of the removable load, and the the ultra-low power switching power supply to provide power to the management circuit, which responsive to the detection of the removable load by the load detection circuit, enters an active state and causes the DC regulator circuit and the off-line switched power supply to each change to an active state and provide the regulated DC level to the removable load; wherein the off-line switched power supply, the DC regulator circuit, and the management circuit each remain in a substantially “
off”
state while the load detection circuit does not detect the removable load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 20)
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14. A multi-pocket battery charger, comprising:
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an off-line switched power supply, controllable between an “
on”
state and an “
off”
state, which provides a shared direct current (DC) output from an alternating current (AC) source when in the “
on”
state;a plurality of pocket circuits, each pocket circuit having a DC regulator, a charge controller, and a battery detect circuit, each charge controller having an “
on”
state and an “
off”
state and which is configured to recharge a rechargeable battery from the shared DC output of the off-line switched power supply when in the “
on”
state, each battery detect circuit operable to detect the presence of the rechargeable battery being coupled to the charging circuit and provide a battery detect signal while the rechargeable battery is present;an ultra-low power management circuit, operable in either an active state or a sleep state, and which remains in the sleep state in the absence of any battery detect signal and operates in the active state responsive to at least one battery detect signal, and which enables the off-line switched power supply to the “
on”
state and the charge controller of each pocket circuit corresponding to the at least one battery detect signal to the “
on”
state when in the active state; andan ultra-low power auxiliary power supply which provides power from the AC source to the battery detect circuit of each pocket circuit to detect the presence of the rechargeable battery and to the ultra-low power management circuit, which responsive to the detection of the rechargeable battery by at least one battery detect circuit, enters an active state and enables the off-line switched power supply to the “
on”
state and the charge controller of each pocket circuit corresponding to the at least one battery detect circuit to the “
on”
state. - View Dependent Claims (15)
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16. A power control circuit, comprising:
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an off-line switched power converter controllable to either an “
on”
state or an “
off”
state responsive to a switch signal and having a transformer defining a primary side and a secondary side, the primary side configured to couple to an AC source and having a feedback receiving circuit which receives feedback from the secondary side, the secondary side configured to provide electrical output to a removable load when the off-line switching power converter is operated in the “
on”
state;a regulator circuit on the secondary side of the off-line switched power converter which is controllable to either an “
on”
state or an “
off”
state responsive to an enable signal and which provides the feedback to the feedback receiving circuit to regulate the electrical output when in the “
on”
state;an ultra-low power inverter having a primary side on the secondary side of the off-line switched power converter and a secondary side on the primary side of the off-line switched power converter, the ultra-low power inverter controllable to either an “
on”
state or an “
off”
state responsive to an enable signal and providing the switch signal to the off-line switched power converter when in the “
on”
state;a load detection circuit on the secondary side of the off-line switched power converter responsive to the presence of the removable load and providing a load present signal when the removable load is present; an ultra-low power management circuit on the secondary side of the off-line switched power converter controllable to either an “
on”
state or an “
off”
state responsive to the load present signal and configured to provide the enable signal to the regulator circuit and ultra-low power inverter upon turning on; andan ultra-low power auxiliary power supply having a primary side coupled to the AC source and a secondary side which provides power to the regulator circuit, ultra-low inverter, load detection circuit, and ultra-low power management circuit. - View Dependent Claims (17, 18, 19)
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Specification