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US 2014/0233264 A1Published application
Single stage PFC power supply
AssigneeFuxiang Lin
InventorFuxiang Lin
Life of this patent
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Abstract
A single stage power factor correction power supply consists of two transformers: a main transformer and an auxiliary transformer (forward transformer). The main transformer transfers energy from the primary circuit to secondary circuit. The auxiliary transformer is used to correct input current waveform. The advantage of this design over the two stages power supply is that the voltage across storage capacitor can be designed to be only slightly higher than the peak value of the rectified input voltage. Therefore, it uses less energy to correct input current waveform and less EMC problem because it has less current through the inductor than two stage PFC power supply.
Claims18
A full bridge rectifier having input terminals which are coupled to input power lines, two output terminals, a positive output terminal and a negative output terminal;
- A first capacitor which is coupled to output terminals;
- A first inductor has first terminal and a second terminal, the first terminal which is coupled to the positive output of the full bridge rectifier;
- A first diode having a cathode and an anode which is coupled to the second terminal of the inductor;
- A second diode having a cathode and an anode which is coupled to the second terminal of the inductor;
- An forward transformer comprising of a primary winding, a second winding with a center tapped;
- the primary winding of the forward transformer is coupled in series in the primary winding circuit of the main transformer that can be in the primary circuit of the half bridge, full bridge or LLC power supply unit;
- the first terminal of the second winding of the forward transformer is coupled to the cathode of the first diode and the second terminal of the second winding is coupled to the cathode of the second diode;
- A second capacitor having a positive terminal and a negative terminal, wherein said the positive terminal is coupled to the center tap of the second winding of the forward transformer and the negative terminal is coupled to the negative output of the full bridge rectifier;
5 more elements
A single stage power factor correction comprising of:
- A full bridge rectifier having output terminals and input terminals which are coupled to input power lines;
- A first capacitor which is coupled to the output terminals of the full bridge rectifier;
- An inductor having a first terminal and a second terminal, where said first terminal of the inductor is coupled to the positive output of the rectifier;
- A diode having a cathode and an anode, wherein said the anode is coupled to the second terminal of the inductor;
- A second diode having a cathode and an anode, wherein said the anode is coupled to the second terminal of the inductor;
- A main transformer having a primary winding and a secondary winding, where said the main transformer is a fly-back transformer or a forward transformer or a push-pull forward transformer;
- A forward transformer having a primary winding and a second winding, wherein said the second winding has a first terminal which is coupled to the cathode of the first diode and a second terminal which is coupled to the cathode of the second diode, and wherein said the primary winding of the forward transformer is connected in series with the primary winding of the main transformer;
- A second capacitor having a positive terminal and a negative terminal, wherein said the positive terminal is coupled to the second terminal of the second winding of the forward transformer and the cathode of the second diode and wherein said the negative terminal coupled to the negative output of the full bridge rectifier.
5 more elements
A single stage power factor correction converter comprising of:
- A forward transformer having a primary winding and second winding with a center tap connected to an first input power line and the primary winding is coupled to a primary winding of a power converter unit which could be a forward converter or a fly-back converter;
- A first diode having a cathode and an anode which is coupled the first terminal of the second winding of the forward transformer;
- A second diode having an anode which is coupled to the input power line and the center tap of the second winding of the forward transformer and a cathode which is coupled to the cathode of the first diode;
- A third diode having an anode and a cathode which is coupled to the input power line;
- A fourth diode having a cathode which is coupled to the second terminal of the second winding of the forward transformer and an anode which is coupled to the anode of the third diode;
- An inductor having two terminals and one terminal coupled to the other input power line;
- A first capacitor having a positive terminal which is coupled to the cathodes of the first diode, the second diode and first terminal of the primary winding of the forward transformer and a negative terminal which is coupled to the other terminal of the inductor;
- A second capacitor having a positive terminal which is coupled to the negative terminal of the first capacitor and negative terminal coupled to the anodes of the third diode and fourth diode;
- A main transformer having a primary winding which its first terminal is coupled to the second terminal of the primary winding of the forward transformer and secondary winding which is coupled to a secondary circuit;
- A switch having a first terminal and a second terminal and a control terminal, the first terminal of the switch is coupled to the second terminal of the primary winding of the main transformer, the second terminal is coupled to the negative terminal of the second capacitor and the anode of the third, fourth diode and the control terminal of the switch is coupled to the control signal of PWM or PFM.
7 more elements
A single stage power factor correction converter comprising of:
- A forward transformer having a primary winding and second winding with a center tap connected to an input power line and primary winding is coupled to a primary winding of a power converter unit of the half-bridge, full-bridge or LLC;
- A first diode having a cathode and anode which is coupled to the first terminal of the secondary winding of the forward transformer;
- A second diode having a cathode which is coupled to the cathode of the first diode and anode which is coupled to the second terminal of the second winding of the forward transformer;
- A third diode having an anode and a cathode which is coupled to the first terminal of the second winding of the forward transformer;
- A fourth diode having an anode which is coupled to the anode of the third diode and a cathode which is coupled to the first terminal of the second winding of the forward transformer;
- A first capacitor having a positive terminal and a negative terminal, the positive terminal is coupled to the cathode of the first diode and second diode;
- A second capacitor having a positive terminal which is coupled to the negative terminal of the first capacitor and the negative terminal coupled to the anode of the third and fourth diode;
- An inductor having a first terminal and a second terminal, the first terminal is coupled to the second input power line and the second terminal is coupled to the negative terminal of the first capacitor and the positive of the second capacitor.
5 more elements
Dependencies are inferred from the claim text.