Back to results
US 2015/0085535 A1Published application
LLC single stage power factor correction converter
OwnerFuxiang Lininventor
Life of this patent
Estimating the term…
Abstract
A single stage PFC LLC power converter is consist of two transformer, one forward transformer, one main transformer. The first winding of the forward transformer is connected with a capacitor in series then paralleled with another capacitor and this circuit is connected with the primary winding of the main transformer in series as primary load circuit in LLC power converter, the energy through the main transformer is transferred to the secondary circuit and the energy through the first winding of the forward transformer is transferred to the second winding of the forward transformer to correct the input current waveform.
Claims14
A single stage PFC LLC converter including:
- A full-bridge rectifier, a inductor, four capacitors, two diodes, one forward transformer, one main transformer, two switches and a secondary circuit;
- The full-bridge rectifier is connected to AC power lines by its input terminals, and its output terminal outputs a rectified voltage;
- The inductor has two terminals and its first terminal is coupled to the positive output terminal of the rectifier;
- The first diode has a cathode and an anode which is coupled to the second terminal of the inductor;
- The second diode has a cathode and an anode which is coupled to the second terminal of the inductor and the anode of the first diode;
- The forward transformer has a first winding and a second winding with a central tap, the two end terminals of the second winding are connected to cathodes of first diode and second diode separately;
- The first capacitor is coupled to the outputs of the full-rectifier;
- The second capacitor has a positive terminal which is coupled to the central tap of the second winding of the forward transformer and a negative terminal which is coupled to the negative output of the full-bridge rectifier;
- The first switch has a first terminal which is coupled to the positive terminal of the second capacitor, a second terminal and a control terminal which is coupled to the LLC control circuit;
- The second switch has first terminal which is coupled to the second terminal of the first switch, a second terminal which is coupled to negative terminal of the second capacitor and a control terminal which is coupled to a LLC control circuit;
- Main transformer has a primary winding and a secondary winding which is coupled to a secondary circuit, the primary winding has first terminal and a second terminal which is coupled to the negative terminal of the second capacitor;
- The third capacitor is coupled to the first winding of the forward transformer in series;
- The fourth capacitor is coupled to the series circuit of the third capacitor and first winding of the forward transformer in parallel, One terminal of this circuit coupled to the junction of the first switch and the second switch, the other terminal is coupled to the primary winding of the main transformer.
10 more elements
A 120v single stage PFC LLC converter consisting of:
- Four diodes:
- first diode, second diode, third, and fourth diode,
- Four capacitors:
- first capacitor, second capacitor, third capacitor and fourth capacitor
- One inductor
- One fourth transformer with a first winding and a second winding with a central tap
- One main transformer with a primary winding and a secondary winding
- A secondary circuit
- Two switches:
- first switch, second switch;
- The inductor has two terminals, a first terminal is coupled to an input power line;
- The central tap of the second winding of the forward transformer is coupled to the other input power line;
- The first capacitor has a positive terminal and negative terminal which is coupled to the second terminal of the inductor;
- The second capacitor has a positive terminal which is coupled to the second terminal of the inductor and negative terminal of the first capacitor;
- The first diode has its anode coupled to the first terminal of the second winding of the forward transformer and its cathode coupled to the positive terminal of the first capacitor;
- The second has its anode coupled to the second terminal of the second winding of the forward transformer and its cathode coupled to the positive terminal of the first capacitor;
- The third diode has its cathode coupled to the first terminal of the second winding of the forward transformer and its anode coupled to the negative terminal of the second capacitor;
- The fourth diode has its cathode coupled to the second terminal of the second winding of the forward transformer and its anode coupled to the negative terminal of the second capacitor;
- The first switch has a first terminal coupled to the positive terminal of the first capacitor, a second terminal and a control terminal coupled to LLC control circuit;
- The second switch has a first terminal coupled to the second terminal of the first switch, a second terminal coupled to the negative terminal of the second capacitor;
- a control terminal coupled to the LLC control circuit;
- The third capacitor has a first terminal coupled to the first terminal of the first winding of the forward transformer and a second terminal, the second terminal of the first winding of the forward transformer coupled to the second terminal of the first switch and the first terminal of the second switch;
- The fourth capacitor has a first terminal coupled to the second terminal of the first winding of the forward transformer and a second terminal coupled to the second terminal of the third capacitor;
- The primary winding of the main transformer has a first terminal coupled to the second terminals of the third capacitor and the fourth capacitor and a second terminal of primary winding coupled to the negative terminal of the second capacitor, the secondary winding of the main transformer is coupled to the secondary circuit.
21 more elements
Dependencies are inferred from the claim text.