大家好，我在用saber软件仿真SG3525控制的buck-boost电路时遇到的问题，请高手帮忙解决一下，谢谢！
The static_ramping algorithm failed. Trying the den_ramping algorithm.
Solve returns: Singular Jacobian
Automatic algorithm selection exhausted
*** ERROR "MAST_NO_NUM_REFERENCE" *** Numerically no reference to
/sg3525a.sg3525a4/sdbas.
*** ERROR "MAST_NO_NUM_REFERENCE" *** Numerically no reference to
/sg3525a.sg3525a5/sdbas.
*** ERROR "MAST_NO_NUM_REFERENCE" *** Numerically no reference to
/sg3525a.sg3525a6/sdbas.
*** ERROR "ALG_SINGULAR_JACOBIAN" *** Singular Jacobian matrix.
Some possible causes for a singular Jacobian matrix:
- Model operating outside of its intended region of operation.
- Node/subsystem with no connection to the reference (floating).
- Current loops (voltage sources/inductors in parallel).
- Missing equation and/or missing variable reference.
