Rechargeable back-up battery system including a number of battery cells having float voltage exceeding maximum load voltage
First Claim
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1. Apparatus comprising:
- a back-up battery system for providing back-up power to a switching equipment load, said load receiving power from a primary supply at a nominal load voltage, which is between a maximum load voltage value and a minimum load voltage required so as to avoid disturbances to said load comprising;
one or more first rechargeable batteries, each said first rechargeable battery having cells floated at a given float voltage and being of a number such that the voltage of the first rechargeable battery exceeds the minimum load voltage for a preselected period after the first rechargeable battery is switched in circuit with said load, said preselected period exceeding the period over which the first rechargeable battery reaches an initial minimum voltage, and said cells being further of a number such that the float voltage of the first rechargeable battery exceeds said maximum load voltage;
means for sensing the voltage being supplied by said primary supply to said load for selectively switching said one or more rechargeable batteries in circuit with said load upon a given condition of said supplied voltage;
and means for converting the voltage provided by each said one or more first rechargeable batteries to below said maximum load voltage when said first rechargeable batteries are switched in circuit with said load.
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Abstract
A back-up battery system for a switching equipment load in a telephone central office wherein the back-up battery system includes one or more rechargeable batteries having cells floated at a given float voltage and of a number such that when the batteries are switched in circuit across the load, the voltage of the batteries exceeds a minimum load voltage for a preselected period, and further being of a number such that the float voltage of the batteries exceeds a maximum load voltage.
72 Citations
28 Claims
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1. Apparatus comprising:
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a back-up battery system for providing back-up power to a switching equipment load, said load receiving power from a primary supply at a nominal load voltage, which is between a maximum load voltage value and a minimum load voltage required so as to avoid disturbances to said load comprising; one or more first rechargeable batteries, each said first rechargeable battery having cells floated at a given float voltage and being of a number such that the voltage of the first rechargeable battery exceeds the minimum load voltage for a preselected period after the first rechargeable battery is switched in circuit with said load, said preselected period exceeding the period over which the first rechargeable battery reaches an initial minimum voltage, and said cells being further of a number such that the float voltage of the first rechargeable battery exceeds said maximum load voltage; means for sensing the voltage being supplied by said primary supply to said load for selectively switching said one or more rechargeable batteries in circuit with said load upon a given condition of said supplied voltage; and means for converting the voltage provided by each said one or more first rechargeable batteries to below said maximum load voltage when said first rechargeable batteries are switched in circuit with said load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17)
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16. A method of providing back-up power to a switching equipment load, said load receiving power from a primary supply at a nominal load voltage, which is between a maximum load voltage and a minimum load voltage required so as to avoid disturbances to said load comprising:
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providing one or more first rechargeable batteries, each said first rechargeable battery having cells floated at a given float voltage and being of a number such that the voltage of the first rechargeable battery exceeds the minimum load voltage for a preselected period after the first rechargeable battery is switched in circuit with said load, said preselected period exceeding the period over which the first rechargeable battery reaches an initial minimum voltage, and said cells being further of a number such that the float voltage of the first rechargeable battery exceeds said maximum load voltage; sensing the voltage being supplied by said primary supply to said load for selectively switching said one or more rechargeable batteries in circuit with said load upon a given condition of said supplied voltage; and converting the voltage provided by each said one or more first rechargeable batteries to below said maximum load voltage when said first rechargeable batteries are switched in circuit with said load. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification