Battery protection circuit
First Claim
1. A power supply arrangement for supplying power from a battery (2) to an electric load (3;
-
23), said arrangement comprising;
a controlled switch (4;
34;
44) having a first state in which a connection is provided from the battery (2) to the load (3;
23), and a second state in which the load (3;
23) is disconnected from the battery (2), and control circuitry (5, 8, 9) for controlling the state of the controlled switch (4;
34;
44), characterized in that the control circuitry (5, 8, 9) is arranged to be disconnected from the battery (2) when the Controlled switch (4;
34;
44) is in its second state.
1 Assignment
0 Petitions
Accused Products
Abstract
A power supply arrangement for supplying power from a battery (2) to an electric load (3) comprises a controlled switch (4) having a first state in which a connection is provided from the battery (2) to the load (3), and a second state in which the load (3) is disconnected from the battery (2), and a control circuit (5, 8, 9) for controlling the state of the controlled switch (4). The control circuit (5, 8, 9) is arranged to be disconnected from the battery (2) when the controlled switch (4) is in its second state. By disconnecting not only the electrical load, but also the control circuit from the battery, it is ensured that this circuit cannot draw any leakage current from the battery, when the load is switched off. This means that no over-discharge protection is needed in the battery itself.
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Citations
11 Claims
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1. A power supply arrangement for supplying power from a battery (2) to an electric load (3;
-
23), said arrangement comprising;
a controlled switch (4;
34;
44) having a first state in which a connection is provided from the battery (2) to the load (3;
23), and a second state in which the load (3;
23) is disconnected from the battery (2), andcontrol circuitry (5, 8, 9) for controlling the state of the controlled switch (4;
34;
44),characterized in that the control circuitry (5, 8, 9) is arranged to be disconnected from the battery (2) when the Controlled switch (4;
34;
44) is in its second state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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23), said arrangement comprising;
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8. A method of protecting a battery (2) from over-discharge,
said battery (2) being connected through a controlled switch (4; -
34;
44) to an electric load (3;
23) under control of control circuitry (5, 8, 9), said controlled switch (4;
34;
44) having a first state in which a connection is provided from the battery (2) to the load (3;
23),and wherein the load (3;
23) is disconnected from the battery (2) by bringing the controlled switch (4;
34;
44) to a second state,characterized in that the method comprises the step of disconnecting the control circuitry (5, 8, 9) from the battery (2) when the controlled switch (4;
34;
44) is in its second state. - View Dependent Claims (9, 10, 11)
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34;
Specification