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A battery charger includes a battery cell, a reference voltage generating section, an A/D converting section including an A/D converter and a control section. The reference voltage generating section includes a first reference voltage circuit generating a first reference voltage and a second referen

A battery charger includes a battery cell, a reference voltage generating section, an A/D converting section including an A/D converter and a control section. 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. To diagnose the A/D converter, the first reference voltage circuit is used. To diagnose the first reference voltage circuit, a second A/D conversion value obtained by A/D converting a second divided voltage of the second reference voltage via the A/D converter using the first reference voltage is compared with a first reference value obtained by A/D converting a first divided voltage of the first reference voltage via the A/D converter using the first reference voltage when the first reference voltage circuit is normal.

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1. A battery charger comprising: a first reference voltage generating circuit that outputs a first reference voltage and a first divided voltage generated by dividing the first reference voltage;a second reference voltage generating circuit that outputs a second reference voltage and a second divide

1. A battery charger comprising: a first reference voltage generating circuit that outputs a first reference voltage and a first divided voltage generated by dividing the first reference voltage;a second reference voltage generating circuit that outputs a second reference voltage and a second divided voltage generated by dividing the second reference voltage;an A/D converter that includes a reference voltage input section and an A/D conversion voltage input section; anda switching section that supplies the first reference voltage or the second reference voltage to the reference voltage input section and that supplies one of the first divided voltage, the second divided voltage and a voltage from a battery cell to the A/D conversion voltage input section. 2. A battery charger according to claim 1, further comprising a control section, wherein when the battery cell is monitored, the control section controls the switching section to supply the first reference voltage to the reference voltage input section and to supply the voltage from the battery cell to the A/D conversion voltage input section,wherein when of the A/D converter is diagnosed, the control section controls the switching section to supply the first reference voltage to the reference voltage input section and to supply the first divided voltage to the A/D conversion voltage input section, andwherein when the first reference voltage generating circuit is diagnosed, the control section controls the switching section to supply the first reference voltage to the reference voltage input section and to supply the second divided voltage to the A/D conversion voltage input section. 3. A battery charger according to claim 1, further comprising a control section, wherein when the battery cell is monitored, the control section controls the switching section to supply the first reference voltage to the reference voltage input section and to supply the voltage from the battery cell to the A/D conversion voltage input section,wherein when of the A/D converter is diagnosed, the control section controls the switching section to supply the first reference voltage to the reference voltage input section and to supply the first divided voltage to the A/D conversion voltage input section, andwherein when the first reference voltage generating circuit is diagnosed, the control section controls the switching section to supply the second reference voltage to the reference voltage input section and to supply the first divided voltage to the A/D conversion voltage input section. 4. A battery charger according to claim 3, wherein the control section includes a comparing section,wherein when the battery cell is monitored, the control section controls the A/D converter 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 the A/D converter is diagnosed, the control section controls the A/D converter 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, andwherein when the first reference voltage generating circuit is diagnosed, the control section controls the A/D converter to output a third A/D conversion value obtained by A/D converting the first divided voltage via the A/D converter using the second 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 generating circuit is normal in a case where the A/D converter and the first reference voltage generating circuit are normal. 5. The battery charger according to claim 4, wherein the control section stops a charging operation of the battery cell when the second A/D conversion value and the second reference value are not equal to each other, diagnoses the first reference voltage generating circuit when the second A/D conversion value and the second reference value are equal to each other, and stops the charging operation of the battery cell when the third A/D conversion value and the third reference value are not equal to each other. 6. A self-diagnosis method of a reference voltage circuit supplying an A/D conversion reference voltage to an A/D converter comprising: connecting an A/D converting section to a first divided voltage output section outputting a first divided voltage of the reference voltage of the reference voltage generating circuit, obtaining a first A/D conversion value by A/D converting the first divided voltage via the A/D converter using the reference voltage, and comparing the first A/D conversion value with a first reference value obtained by A/D converting the first divided voltage via the A/D converter using the reference voltage when the A/D converter is normal; andconnecting the A/D converting section to the first divided voltage output section outputting the first divided voltage of the reference voltage of the reference voltage generating circuit when the first A/D conversion value is equal to the first reference value, obtaining a second A/D conversion value by A/D converting the first divided voltage via the A/D converter using a second reference voltage of a second reference voltage generating circuit generating the second reference voltage equal to the reference voltage, and comparing 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 reference voltage when the reference voltage circuit is normal in the case where the A/D converter and the reference voltage generating circuit are normal.