Circuit configuration for protecting a battery against deep discharge
First Claim
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1. A circuit configuration for protecting a battery against deep discharge, comprising:
- two external terminals for connecting to a series connected battery and load;
a controllable switch connected between said two external terminals;
a series circuit including an energy storage device and a charging device for said energy storage device, said series circuit connected between said two external terminals; and
a control circuit connected to said controllable switch;
said energy storage device being for supplying said control circuit;
said control circuit for generating a control signal in a manner dependent on a limit value and a voltage across said controllable switch being determined when said controllable switch is open;
said control signal causing said controllable switch to be open when said voltage across said controllable switch lies below said limit value; and
said control signal causing said controllable switch to be open during regularly occurring, short time intervals and otherwise closed when said voltage across said controllable switch lies above said limit value.
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Abstract
The inventive circuit configuration has only two poles and is connected in series between the battery and the load. The circuit configuration interrupts the electric circuit for a short time in order to gauge the condition of the battery. The interruption is so short that it is not perceived by a user.
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Citations
14 Claims
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1. A circuit configuration for protecting a battery against deep discharge, comprising:
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two external terminals for connecting to a series connected battery and load; a controllable switch connected between said two external terminals; a series circuit including an energy storage device and a charging device for said energy storage device, said series circuit connected between said two external terminals; and a control circuit connected to said controllable switch; said energy storage device being for supplying said control circuit; said control circuit for generating a control signal in a manner dependent on a limit value and a voltage across said controllable switch being determined when said controllable switch is open; said control signal causing said controllable switch to be open when said voltage across said controllable switch lies below said limit value; and said control signal causing said controllable switch to be open during regularly occurring, short time intervals and otherwise closed when said voltage across said controllable switch lies above said limit value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification