Ripple detection device and ripple suppression device

A ripple detection device, comprising:

• a ripple sampling unit, at least two DC sampling units, and a digital signal processing unit,
• wherein the ripple sampling unit includes at least two input ports and an output port, an i-th input port of the ripple sampling unit is connected to an i-th port of a non-isolated DC/DC bidirectional energy conversion unit, and the output port of the ripple sampling unit is connected to an input port of the digital signal processing unit, where i is an integer greater than or equal to 1;
• one of the at least two DC sampling units includes an input port and an output port, the input port of the DC sampling unit is connected to a port of the non-isolated DC/DC bidirectional energy conversion unit, and the output port of the DC sampling unit is connected to an input port of the digital signal processing unit;
• wherein the ripple sampling unit is configured to output a first voltage signal at an output port of the non-isolated DC/DC bidirectional energy conversion unit to the digital signal processing unit;
• each of the DC sampling units is configured to output a first DC signal in a second voltage signal at the connected port of the non-isolated DC/DC bidirectional energy conversion unit to the digital signal processing unit, and to block an AC signal in the second voltage signal to be output to the digital signal processing unit;
• the digital signal processing unit is configured to determine a ripple noise signal at the output port of the non-isolated DC/DC bidirectional energy conversion unit according to the first voltage signal and the first DC signal.