Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
307 words
An AC to DC forward converter comprising: (a) input rectifying means for receiving AC voltage on AC input lines and rectifying the voltage to a DC time varying voltage on output lines from the rectifying means; (b) an input inductor receiving the DC voltage from the rectifying means on one of the output lines from the rectifying means and providing current therefrom to a main node; (c) a DC bus supply line and DC bus return line, the DC bus return line connected to one of the output lines from the rectifying means to return current to the rectifying means; (d) a diode connected between the main node and the DC bus supply line to provide current from the input inductor through the diode to the DC bus supply line; (e) an energy storage capacitor connected across the DC bus lines; (f) a first controllable switching device and a diode connected together at a node and connected across the DC bus lines; (g) a second controllable switching device connected from the main node to the DC bus return line; (h) a high frequency transformer having a primary and a secondary, the primary connected between the node connecting the first switching device and the diode and the main node; (i) output rectifying means connected to the secondary of the transformer for rectifying the output voltage of the secondary to provide a DC voltage to a load; and (j) control means for controlling the switching of the first and second switching devices to provide alternate cyclic periods of charging of the energy storage capacitor and selected discharging of the capacitor through the primary of the transformer via the switching devices when both switching devices are turned on, wherein the switching devices are turned off during each cycle at least long enough to drive the transformer magnetizing current to zero.
Claim 2
Dependent Claim
307 words
An AC to DC forward converter comprising: (a) input rectifying means for receiving AC voltage on AC input lines and rectifying the voltage to a DC time varying voltage on output lines from the rectifying means; (b) an input inductor receiving the DC voltage from the rectifying means on one of the output lines from the rectifying means and providing current therefrom to a main node; (c) a DC bus supply line and DC bus return line, the DC bus return line connected to one of the output lines from the rectifying means to return current to the rectifying means; (d) a diode connected between the main node and the DC bus supply line to provide current from the input inductor through the diode to the DC bus supply line; (e) an energy storage capacitor connected across the DC bus lines; (f) a first controllable switching device and a diode connected together at a node and connected across the DC bus lines; (g) a second controllable switching device connected from the main node to the DC bus return line; (h) a high frequency transformer having a primary and a secondary, the primary connected between the node connecting the first switching device and the diode and the main node; (i) output rectifying means connected to the secondary of the transformer for rectifying the output voltage of the secondary to provide a DC voltage to a load; and (j) control means for controlling the switching of the first and second switching devices to provide alternate cyclic periods of charging of the energy storage capacitor and selected discharging of the capacitor through the primary of the transformer via the switching devices when both switching devices are turned on, wherein the switching devices are turned off during each cycle at least long enough to drive the transformer magnetizing current to zero.
Claim 3
Dependent Claim
27 words
The converter of claim 1 wherein the switching devices are controlled to provide substantially sinusoidal input current from the AC input lines through the input rectifying means.
Claim 4
Dependent Claim
33 words
The converter of claim 1 wherein the switching devices are controlled by the control means to switch to provide substantially unity power factor at the AC input lines to the input rectifying means.
Claim 5
Dependent Claim
37 words
The converter of claim 1 wherein the control means controls the switching of the switching devices to provide control of the output voltage from the output rectifying means to maintain a desired output voltage to a load.
Claim 6
Dependent Claim
12 words
The converter of claim 1 wherein the controlled switching devices are MOSFETs.
Claim 7
Dependent Claim
19 words
The converter of claim 1 wherein the input rectifying means comprises four diodes connected in a full bridge configuration.
Claim 8
Dependent Claim
50 words
The converter of claim 1 wherein the output rectifying means comprises a diode connected to the secondary of the transformer to rectify the output therefrom, and further including an output inductor connected in series with the diode and with the load and a capacitor connected in parallel with the load.
Claim 9
Dependent Claim
24 words
The converter of claim 1 wherein the control means controls the two switching devices so that they are not turned on and off simultaneously.