| 摘要 |
According to the present invention, a main rectification smoothing circuit is connected to one end of a secondary coil (ns) of a transformer (T), and a plurality of rectification smoothing circuits are connected to a plurality of intermediate taps of the secondary coil. Each of the rectification smoothing circuits is provided with a switch element (Q21, Q22, Q23). In the preliminary driving period, a DSP (30) for performing switching control on the switch elements (Q21, Q22, Q23) reads the forward drop voltage of the first diode load (11), the second diode load (12), and the third diode load (13), and sets a feedback gain corresponding to the forward drop voltage (VF). The DSP (30) performs switching control on the switch elements (Q21, Q22, Q23) on the basis of the set feedback gain, and commences rated driving. A diode load driving power supply device capable of suppressing fluctuations during diode load startup, such as overshoots, is thereby provided. |
