| 摘要 |
The DC-DC converter includes: a series circuit of two switch elements (1,2), which is connected between the positive electrode and the negative electrode of a DC current source (10). Also a transformer (4) with primary and secondary windings (5,8), a tertiary winding (6) and a quaternary winding (7). A series circuit of at least one capacitor (3) and the primary winding (5), which is connected parallel to one of the switch elements (1,2). A rectifying and smoothing circuit (12-14) connected at the secondary winding (8) provides a DC output voltage, and a circuit (16) forms an on-off signal from the tertiary winding (6) for application at that switch element (2), which is connected with the positive pole of the DC source (10). The quaternary winding (7) is used as the current supply for a control circuit (18). The time point of the passage of the voltage across the quaternary winding (7) from positive to negative is determined by the control circuit (18), and an on-off signal at this moment is applied at that switch element (1), which is connected with the negative pole of the DC source (10). So that a half wave or a full wave rectification of the positive-negative voltage results at the secondary winding of the transformer and at an output DC voltage (Vo) is obtained.
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