Uninterruptible power supply circuit
First Claim
1. An uninterruptible power supply circuit, comprising:
- a first power supply unit for supplying a first power supply voltage;
a second power supply unit for supplying a second power supply voltage which is lower than said first power supply voltage;
a back-up power supply unit for supplying a back-up power supply voltage;
a charge current control unit for receiving said first power supply voltage and for controlling a charge current supplied to said back-up power supply unit according to a capacity of said back-up power supply unit;
a reverse current protection unit connected between said second power supply unit and an output node connected to an output terminal of the uninterruptible power supply circuit;
an overcharge protection unit connected between said back-up power supply unit and said output node, for protecting said back-up power supply unit from being overcharged; and
a relay unit driven by said first power supply voltage and forming a path for dire applying said back-up power supply voltage to said output node when said first power supply voltage is cut off.
1 Assignment
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Accused Products
Abstract
An uninterruptible power supply circuit has a first power supply unit for supplying a first power supply voltage; a second power supply unit for supplying a second power supply voltage which is lower than the first power supply voltage; a back-up power supply unit for supplying a back-up power supply voltage; a charge current control unit for receiving the first power supply voltage and for controlling a charge current which is supplied to the back-up power supply unit according to a capacity of the back-up power supply unit; a reverse current protection unit connected between the second power supply unit and an output node connected to an output terminal; an overcharge protection unit connected between the back-up power supply unit and the output node, for protecting the back-up power supply unit from being overcharged; and a relay unit which is driven by the first power supply voltage and forms a path for outputting the back-up power supply voltage to the output node when the first power supply voltage is cut off.
22 Citations
10 Claims
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1. An uninterruptible power supply circuit, comprising:
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a first power supply unit for supplying a first power supply voltage; a second power supply unit for supplying a second power supply voltage which is lower than said first power supply voltage; a back-up power supply unit for supplying a back-up power supply voltage; a charge current control unit for receiving said first power supply voltage and for controlling a charge current supplied to said back-up power supply unit according to a capacity of said back-up power supply unit; a reverse current protection unit connected between said second power supply unit and an output node connected to an output terminal of the uninterruptible power supply circuit; an overcharge protection unit connected between said back-up power supply unit and said output node, for protecting said back-up power supply unit from being overcharged; and a relay unit driven by said first power supply voltage and forming a path for dire applying said back-up power supply voltage to said output node when said first power supply voltage is cut off. - View Dependent Claims (2, 3, 4)
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5. An uninterruptible power supply circuit, comprising:
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first receiving means, said first receiving means receiving a first power supply voltage; second receiving means, said second receiving means receiving a second power supply voltage, said second power supply voltage being lower than said first power supply voltage; a back-up power supply for supplying a back-up power supply voltage; a back-up power supply charger for charging said back-up power supply with said first power supply voltage; a reverse current protector connected between said second means for receiving said second power supply voltage and an output terminal of the uninterruptible power supply circuit; an overcharge protector connected between said back-up power supply and said output terminal, for protecting said back-up power supply from being overcharged; and a control switch driven by said first power supply voltage and forming a path for directly outputting said back-up power supply voltage to said output terminal in an absence of said first power supply voltage. - View Dependent Claims (6, 7, 8)
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9. A process for providing an uninterruptible power supply voltage, comprising:
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providing a first power supply voltage; providing a second power supply voltage lower in amplitude than said first power supply voltage; providing a source of a back-up power supply voltage; charging said source of back-up power supply voltage with a controlled charge current driven from said first power supply voltage; providing at an output terminal exhibiting said uninterrupted power supply voltage, reverse current protection between said second power supply voltage and an output terminal; providing overcharge protection for protecting said source of back-up power from being overcharged; and directly connecting the back-up power supply voltage to said output terminal when the first power supply voltage is cut off. - View Dependent Claims (10)
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Specification