| 摘要 |
A square waveform voltage is supplied to a second output circuit of a switching power supply. The second output circuit utilizes a FET, and by controlling the width of a pulse chopped from the square waveform voltage, obtains a direct current output voltage having a set value. However, if there is a time delay in a control signal for driving the FFT on/off, fast switching operations cannot be followed and controlled. Also, due to this delay in the control signal, the width of the pulse is limited, and it is difficult to obtain a high secondary output voltage. In the present invention, by providing an auxiliary power supply and a synchronizing signal generator for generating a synchronizing signal having a special waveform, a switching power supply can be realized in which the delay time of the control signal is reduced, and a high secondary output voltage can be obtained.
|
