Direct current/direct current bridge for motor drives in lift, has semiconductor switches in parallel- connected arms, which are controlled by pulse width modulation

摘要

The bridge (B1) includes two bridges sections (B11,B12) among which one section (B11) has two parallel- connected arms (B11,B12) containing semiconductor switches (S21-S24) and another section (B12) has a single arm with switches (S25,S26). The switches (S21-S24) in the parallel- connected arms are controlled through pulse width modulation (PWM) to form a PWM controlled bridge section. An Independent claim is also included for control unit.