A detection apparatus for unbalanced DC link capacitor voltage, the DC link provides a DC voltage (V DC ) and includes a plurality of capacitors (C 11 -C 1N ) coupled in series to two ends of the DC link and a plurality of balanced resistors (R B11 -R B1N ) coupled in series to two ends of the DC link and corresponding to the capacitors (C 11 -C 1N ). The detection apparatus includes a plurality of sense resistors (R S1 -R SM ) and a current sensor (A). One end of each sense resistor (R S1 -R SM ) is coupled to a common-connected node of two capacitors (C 11 -C 1N ), and the other end thereof is coupled to a common-connected node of two balanced resistors (R B11 -R B1N ). The current sensor (A) is coupled to one of the sense resistors (R S1 -R SM ) and measures a current value (I S ) of a current flowing through the sense resistor (R S1 -R SM ) coupled to the current sensor (A).