Multichannel test system with galvanic coupling of intermediate circuits, and method for galvanically coupling intermediate circuits

Method for supplying test load devices with electrical power from a supply grid by means of a multichannel test system having at least two galvanically separated test channels, comprising the steps of:

• converting electrical power between the supply grid and a DC-carrying intermediate circuit of each test channel by means of a power converter circuit;
• including the intermediate steps of:
• rectifying the AC voltage between a transformer and a DC-carrying intermediate circuit or rectifying the AC voltage between the supply grid and a closed-loop intermediate circuit voltage controller by means of an active power stage in each test channel;
• wherein the rectification can be transferred between a phase-controlled, variably adjustable rectification by means of an active operating mode and an uncontrolled invariable rectification by means of a passive operating mode of the active power stage;
• converting a DC voltage between the DC-carrying intermediate circuit, and a predetermined output voltage for test load devices by means of at least one output stage in each test channel;
• and
• galvanically coupling intermediate circuits of at least two test channels to form a common intermediate circuit or galvanically separating the intermediate circuits by means of a switching device when
• the rectification in the active power stages of the at least two test channels was transferred to uncontrolled, invariable rectification by means of the passive operating mode.