Characteristic current generating circuit for topology identification

The utility model relates to a characteristic current generating circuit for topology identification, which comprises a characteristic current signal generating module, a characteristic current driving module, a characteristic current switching module and an optocoupler, and adopts a driving amplifying circuit, so that compared with the conventional characteristic current generating circuit, the characteristic current generating circuit has the advantage of stable performance; compared with an existing characteristic current generation circuit, the over-current fault protection circuit has the advantages that the over-current fault protection module is adopted, compared with the existing characteristic current generation circuit, the advantage of over-current protection is achieved, the follow current module is further adopted for protecting the MOS tube, the current flowing through an MOS tube loop is shunted at the moment from conduction to cut-off of the MOS tube, and the advantage of high reliability is a