Patent ID: 8692510
Filing Date: 2014-04-08
Classification: G01R,H01M,H02J,H03M,Y02E

Abstract:
1. A battery charger comprising: a battery cell; a reference voltage generating section; an A/D converting section; and a control section, wherein the reference voltage generating section includes a first reference voltage circuit generating a first reference voltage and a second reference voltage circuit generating a second reference voltage equal to the first reference voltage, wherein the A/D converting section includes an A/D converter, a connection switching section, and a connection switching control section controlling the connection switching section, wherein the control section includes a comparing section, wherein when a charging condition of the battery cell is monitored, the control section controls the A/D converting section to connect the battery cell to the A/D converter and to output a first A/D conversion value by A/D converting a voltage value of the battery cell via the A/D converter using the first reference voltage, and the control section controls the comparing section to compare the first A/D conversion value with a predetermined first reference value, wherein when characteristics of the A/D converter are diagnosed, the control section controls the A/D converting section to connect the A/D converting section to a first divided voltage output section outputting a first divided voltage of the first reference voltage of the first reference voltage circuit and to output a second A/D conversion value obtained by A/D converting the first divided voltage via the A/D converter using the first reference voltage, and the control section controls the comparing section to compare the second A/D conversion value with a second reference value obtained by A/D converting the first divided voltage via the A/D converter using the first reference voltage when the A/D converter is normal, and wherein when characteristics of the first reference voltage circuit are diagnosed, the control section controls the A/D converting section to connect the A/D converting section to a second divided voltage output section outputting a second divided voltage of the second reference voltage of the second reference voltage circuit so that a voltage dividing ratio of the second divided voltage with respect to the second reference voltage is equal to a voltage dividing ratio of the first divided voltage with respect to the first reference voltage and to output a third A/D conversion value obtained by A/D converting the second divided voltage via the A/D converter using the first reference voltage, and the control section controls the comparing section to compare the third A/D conversion value with a third reference value obtained by A/D converting the first divided voltage via the A/D converter using the first reference voltage when the first reference voltage circuit is normal in a case where the A/D converter and the first reference voltage circuit are normal.