Battery pack with analog switch

摘要

An analog switch and a battery pack using the same are provided. The analog switch can compensate for temperature dependence of voltages measured from a battery cell before applying the measured voltages to an analog-to-digital (A/D) converter. In an embodiment of the analog switch, a first diode is coupled in a backward direction from a flying capacitor, which is coupled to the A/D converter, to correspond to a second diode packaged therewith as a single set. The first diode is positioned in a battery cell voltage input path to store battery cell voltage values in the flying capacitor, while the second diode suppresses a temperature-related difference caused by the first diode to voltages measured from the battery cell.

主权项

1. An analog switch comprising:
a first input configured to conductively couple to a positive terminal of a battery such that the coupling from the positive terminal of the battery to the first input is configured to conduct current; a second input configured to conductively couple to a negative terminal of the battery such that the coupling from the negative terminal of the battery to the second input is configured to conduct current; an output configured to conductively couple to an analog-to-digital (A/D) converter such that the coupling from the A/D converter to the output is configured to conduct current; a flying capacitor having a positive terminal conductively coupled to the first input through a first coupling and a negative terminal conductively coupled to the second input through a second coupling such that the first coupling from the first input to the positive terminal of the flying capacitor is configured to conduct current and the second coupling from the second input to the negative terminal of the flying capacitor is configured to conduct current; a first diode along the second coupling and dividing the second coupling into a third coupling from the second input to the first diode and a fourth coupling from the first diode to the negative terminal of the flying capacitor, the first diode comprising an anode conductively coupled to the second input and a cathode conductively coupled to the negative terminal of the flying capacitor such that the third coupling from the second input to the anode of the first diode is configured to conduct current and the fourth coupling from the cathode of the first diode to the negative terminal of the flying capacitor is configured to conduct current; and a second diode comprising an anode conductively coupled to a first capacitor for storing a supply voltage, and a cathode conductively coupled to the negative terminal of the flying capacitor such that the coupling from the first capacitor to the anode of the second diode is configured to conduct current and the coupling from the cathode of the second diode to the negative terminal of the flying capacitor is configured to conduct current.