A/d converter fault detection device, power supply device comprising same, and a/d converter fault detection method

A failure detection method of an A/D converter-failure detection device, wherein

• the A/D converter-failure detection device includes:
• a first IC including a first reference terminal connected to a predetermined reference signal, a first A/D converter converting a first analog value of the predetermined reference signal detected at the first reference terminal into a first digital signal at a first resolution, and a first communication terminal communicating with other part;
• and
• a second IC including a second reference terminal connected to the predetermined reference signal, a second A/D converter converting a second analog value of the predetermined reference signal detected at the second reference terminal into a second digital signal at a second resolution, and a second communication terminal connected to and communicating with the first communication terminal, and
• the failure detection method comprises:
• allowing the first IC to detect the first analog value of the predetermined reference signal at the first reference terminal, to convert the first analog value into the first digital signal at the first resolution by the first A/D converter, and to transmit the first digital signal from the first communication terminal to the second communication terminal;
• allowing the second IC to detect the second analog value of the predetermined reference signal at the second reference terminal, and to convert the second analog value into the second digital signal at the second resolution by the second A/D converter;
• allowing the second IC to receive, at the second communication terminal, the first digital signal transmitted from the first IC;
• and
• allowing the second IC to compare the first digital signal with the second digital signal to obtain a difference between the first digital signal and the second digital signal, and to determine an occurrence of a failure when the difference exceeds a predetermined reference value.