Power supply testing system for feedback of output energy from direct current side

The utility model discloses a power source testing system for feedback of output energy from a direct current side, which includes a tested device (3) and comprises a PFC power factor correction module (1), an alternating current or direct current power source module (2), an energy collection module (4) and an energy feedback module (5), wherein a high-pressure direct current bus at the output end of the PFC power factor correction module (1) is respectively connected with the input end of the alternating current or direct current power source module (2) and the output end of the energy feedback module (5); the output end of the direct current power source module (2) is connected with the input end of the tested device (3); the input end of the energy collection module (4) is connected with the output end of the tested device (3); and the output end of the energy collection module (4) is connected with the input end of the energy feedback module (5). By adopting the system, the recovery energy efficiency can be improved, and the harmonic interference to a power grid can be greatly reduced.