CIRCUIT ARRANGEMENT HAVING A BATTERY CASCADE
First Claim
1. A circuit arrangement suitable for measuring the respective voltages in the batteries of a battery cascade witha first battery (A1) whose negative pole is connected to a ground potential (GND),a second battery (A2) whose negative pole is coupled with the positive pole of the first battery, anda capacitor (C1) that is coupled on its first side through a resistor (R1) with the positive pole of the first battery (A1) and can be connected on a second side through a first switch (S1) to the ground potential (GND),wherein the positive pole of the second battery (A2) can be coupled in through a second switch (S2) between the resistor (R1) and the capacitor (C1).
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Abstract
In an electrical device, in which the load is supplied by a battery cascade, the voltages of the batteries of the battery cascade must be measured with high precision in order to start charge equalization and prevent undervoltages or overvoltages, wherein if possible favorable components should be used simultaneously. This problem is solved in that a circuit arrangement having a battery cascade is proposed, comprising a first battery (A1), the negative pole of which has a ground potential (GND), a second battery (A2), the negative pole of which is coupled to the positive pole of the first battery, and further comprising a capacitor (C1), which on the first side thereof is coupled to the positive pole of the first battery by way of a resistor (R1) and with the second side thereof can be applied to the ground potential (GND) by way of a first switch (S1). Furthermore, the positive pole of the second battery (A2) can be coupled between the resistor (R1) and the capacitor (C2) by way of a second switch (S2). The capacitor (C1) can be charged to the voltage (V1) of the first battery and only the differential voltage between the entire battery cascade and the capacitor (C1) must be measured.
8 Citations
13 Claims
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1. A circuit arrangement suitable for measuring the respective voltages in the batteries of a battery cascade with
a first battery (A1) whose negative pole is connected to a ground potential (GND), a second battery (A2) whose negative pole is coupled with the positive pole of the first battery, and a capacitor (C1) that is coupled on its first side through a resistor (R1) with the positive pole of the first battery (A1) and can be connected on a second side through a first switch (S1) to the ground potential (GND), wherein the positive pole of the second battery (A2) can be coupled in through a second switch (S2) between the resistor (R1) and the capacitor (C1).
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10. A process for providing a voltage that is a measure for a voltage in a battery in a battery cascade in which the following steps are carried out:
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Charging of a capacitor (C1) connected to a ground potential until the voltage (V1) of a first battery (A1) of the battery cascade connected to the ground potential (GND) approximates that of the capacitor (C1) with a predefined precision, Decoupling of the capacitor (C1) from the ground potential (GND), in particular by switching a high impedance between the capacitor (C1) and ground potential (GND), Application of the total voltage from the voltage (V1) of the first battery (A1) and the voltage (V2) of a second battery (A2) of the battery cascade to the capacitor (C1). - View Dependent Claims (11, 12, 13)
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Specification