| 摘要 |
A switched-mode regulator circuit (20) is operative on an input unidirectional supply derived by a full wave rectifier (10) from an alternating supply (11) to provide an output unidirectional voltage to a load. The circuit contains switching means (26) for regulating the current drawn from the supply (11) and control means (27) effective, in operation, to render the switching means (26) alternately conductive and non-conductive to maintain the instantaneous magnitude of current drawn from the supply within a range of the instantaneous magnitude of a reference signal. The control means (27) includes means (40, 41, 42, 43; 60, 41, 42, 43) for varying the extent of this range so as to regulate the frequency at which the switching means (26) is rendered alternately conductive and non-conductive. |
