Patent ID: 9520747
Filing Date: 2016-12-13
CPC Classification: H02J,H02M,Y02B,Y04S

Claim Text:
1. A two-input uninterruptible voltage converting device, comprising: a first conversion circuit, in which the first conversion circuit having a high-voltage DC (Direct Current) source, a main power transformer, an upper switch tube and a lower switch tube connected to a primary winding of the main power transformer, and a switch-type rectifying tube connected to a secondary winding of the main power transformer; and an output end of the switch-type rectifying tube taken as an intersection; a second conversion circuit, in which the second conversion circuit formed by a low-voltage DC source, an isolating diode and a low-voltage switch tube connected with each other in series in turn; an output end of the second conversion circuit connected to the intersection; the minimum allowable voltage of the low-voltage DC source being more than the rated output voltage of the device; and the maximum voltage of the low-voltage DC source being less than the voltage peak of the secondary winding of the main power transformer when the high-voltage DC is the minimum allowable value; an energy storage unit, in which the energy storage unit consisting of an inductance and a capacitance and directly connected between the intersection and a load end; a fly-wheel switch tube, in which the fly-wheel switch tube connected between the intersection and the ground; and a control unit, in which the control unit used for outputting first, second, third and fourth PWM (Pulse-Width Modulation) signals in phase to drive the upper switch tube, the lower switch tube, the switch-type rectifying tube and the low-voltage switch tube respectively to operate synchronously and outputting a fifth PWM signal in opposite phase with the first PWM signal to drive the fly-wheel switch tube to operate.