The invention discloses a forward converter, which comprises a power source, an input control circuit, a transformer and a rectifier-filter circuit. The input control circuit has a main switching diode. A secondary winding of the transformer at least includes a secondary main winding. The rectifier-filter circuit comprises a rectifier tube and a N-channel JFET forward diode, and the gate of the rectifier tube and the drain of the forward diode are connected to a positive dotted terminal of a transformer secondary principal winding, and the drain of the rectifier tube is connected to the other end of the transformer secondary principal winding, and a source electrode of the forward diode and a source electrode of the rectifier are connected to a common output ground. The secondary winding of the transformer outputs drive control signals, and a drive circuit for providing pulse drive signals to the forward diode is arranged between the secondary winding and the gate of the forward diode. On-and-off of the JFET forward diode is controlled by voltage signals of the transformer winding so that the forward converter works in a synchronous rectifier state. The drive signals are directly from the transformer winding so that no special driver is needed and no additional power supply is needed, which makes the forward converter simple and reliable.