| CPC H02J 7/345 (2013.01) [B60R 16/033 (2013.01); H02J 1/10 (2013.01); H02J 7/005 (2020.01); H02J 7/00712 (2020.01)] | 9 Claims |
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1. An auxiliary power supply device comprising:
a storage circuit having a first node coupled to a power supply, a second node coupled to a ground, and a first electrical double layer capacitor and a second electrical double layer capacitor connected in series between the first node and the second node;
a first switch element having a first terminal coupled to the first node, and a second terminal, and configured to make a connection or disconnection between the first terminal and the second terminal;
a first discharging resistor provided between the second terminal and a fourth node;
a second discharging resistor provided between the fourth node and the ground;
a second switch element having a third terminal coupled to a third node between the first electrical double layer capacitor and the second electrical double layer capacitor, and a fourth terminal coupled to the fourth node, and configured to make a connection or disconnection between the third terminal and the fourth terminal; and
a measurement controller configured to measure a voltage at the first node, and control the first switch element and the second switch element, wherein
the measurement controller performs
a first process including
a procedure making a disconnection between the third terminal and the fourth terminal by the second switch element, and making a connection between the first terminal and the second terminal, by the first switch element,
a procedure measuring the voltage at the first node, to acquire a first voltage value,
a procedure determining whether or not the voltage at the first node is lower than or equal to a second voltage value that is lower than the first voltage value,
a procedure making a disconnection between the first terminal and the second terminal by the first switch element in a case where the voltage at the first node is lower than or equal to the second voltage value,
a procedure computing a time from when the first terminal and the second terminal are connected by the first switch element until when the first terminal and the second terminal are disconnected, and
a procedure computing a capacitance value of the storage circuit, based on the time, the first voltage value, and the second voltage value, and
a second process including
a procedure making a connection between the first terminal and the second terminal by the first switch element, and making a connection between the third terminal and the fourth terminal by the second switch element, and
a procedure making a disconnection between the first terminal and the second terminal by the first switch element, and making a disconnection between the third terminal and the fourth terminal by the second switch element, after a predetermined time elapses.
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