Discharge circuit and duty ratio setting method

Abstract

A battery controller 6 is connected to a DC / DC converter 3. The battery controller 6 checks the capacities of a battery 4 and a battery 5, calculates a duty ratio between the battery 4 and the battery 5 based on the capacities to determine a switching timing in which a plurality of switching elements are to be switched, and sets the duty ratio in the DC / DC converter 3.

Description

[0001] The present invention relates to a discharge circuit and a duty ratio setting method.[0002] Conventionally, a multiple-battery power supply method used for a data processing apparatus (or unit) supplies power simultaneously from a plurality of batteries with the same characteristics.[0003] Referring to FIG. 4, a discharge circuit using the conventional power supply method will be described.[0004] The conventional discharge circuits shown in FIG. 4 comprises a battery 4 and a battery 5, which have the same characteristics, and a data processing apparatus 8 which comprises a DC / DC converter 3, a switching element 9 connected to the DC / DC converter 3, and a unit load 7.[0005] Turning on the switching element of the conventional discharge circuit with the configuration described above causes the battery 4 and the battery 5 to discharge simultaneously, this configuration can decrease the discharge rate of each battery and increase battery efficiency.SUMMARY OF THE DISCLOSURE[0006]...

AI Technical Summary

Benefits of technology

0023] FIG. 4 is a diagram showing the config

Problems solved by technology

As a result, the problem with the conventional circuit is that the battery with the highest voltage loses its capacity first and, after that, the battery with the lowest voltage is subjected to discharge alone.

Therefore, the conventional discharge circuit does not make the best use of simultaneous discharging, and during discharging, the remaining battery capacity varies among batteries.

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