High efficient single stage half bridge power factor correction converter
First Claim
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1. A single stage half-bridge PFC power converter, comprising:
- A bridge rectifier has two input terminals which are coupled to two input AC power lines, positive output terminal and negative output terminal;
A first capacitor is coupled between the two output terminals;
An inductor has a first terminal which is connected to the positive output of the bridge rectifier and a second terminal;
A first diode has an anode which is connected to the second terminal of the inductor and a cathode;
A second diode has an anode which is connected to the second terminal of the inductor and a cathode;
A forward transformer has a primary winding and a PFC winding;
the PFC winding has a center-tap;
a first terminal of said first PFC winding is coupled to the cathode of the first diode and a second terminal of said second PFC winding is coupled to the cathode of the second diode;
A first capacitor is coupled between the output of said bridge-rectifier;
A second capacitor has a positive terminal which is coupled to the center-tap of the PFC winding of the forward transformer and a negative terminal;
A third capacitor has a positive terminal which is coupled to a negative terminal of the second capacitor and a negative terminal which is coupled to a negative output terminal of bridge-rectifier;
A upper switch has a first terminal which is coupled to the positive terminal of second capacitor, a second terminal which is coupled to the first terminal of primary winding of the forward transformer and a control terminal which is coupled to control signal of PWM;
A lower switch has a first terminal which is coupled to the second terminal of the first switch and a second terminal which is coupled to the negative output terminal of said bridge-rectifier and a control terminal which is coupled to control signal of PWM;
A main transformer has a primary winding and a secondary winding which is coupled to a secondary circuitry;
a first terminal of said primary winding is coupled to the second terminal of primary winding of the forward transformer;
A fourth capacitor has a first terminal is coupled to a second terminal of said primary winding of said forward transformer and a second terminal is coupled to the second terminal of the lower switch;
A fifth capacitor has a first terminal which is coupled to the second terminal of the primary winding of the main transformer and the second terminal which is coupled to the negative terminal of the second capacitor and the positive terminal of the third capacitor.
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Abstract
A half-bridge single stage PFC power converter includes a forward transformer and a main transformer. The primary windings of two transformer are connected in series. The main transformer transmits energy from a primary circuit to a secondary circuit. The forward transformer transits energy to PFC windings of the forward transformer to correct an input current waveform. A capacitor is connected to the primary winding of the forward transformer to reduce the switching loss of the converter.
6 Citations
12 Claims
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1. A single stage half-bridge PFC power converter, comprising:
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A bridge rectifier has two input terminals which are coupled to two input AC power lines, positive output terminal and negative output terminal; A first capacitor is coupled between the two output terminals; An inductor has a first terminal which is connected to the positive output of the bridge rectifier and a second terminal; A first diode has an anode which is connected to the second terminal of the inductor and a cathode; A second diode has an anode which is connected to the second terminal of the inductor and a cathode; A forward transformer has a primary winding and a PFC winding;
the PFC winding has a center-tap;
a first terminal of said first PFC winding is coupled to the cathode of the first diode and a second terminal of said second PFC winding is coupled to the cathode of the second diode;A first capacitor is coupled between the output of said bridge-rectifier; A second capacitor has a positive terminal which is coupled to the center-tap of the PFC winding of the forward transformer and a negative terminal; A third capacitor has a positive terminal which is coupled to a negative terminal of the second capacitor and a negative terminal which is coupled to a negative output terminal of bridge-rectifier; A upper switch has a first terminal which is coupled to the positive terminal of second capacitor, a second terminal which is coupled to the first terminal of primary winding of the forward transformer and a control terminal which is coupled to control signal of PWM; A lower switch has a first terminal which is coupled to the second terminal of the first switch and a second terminal which is coupled to the negative output terminal of said bridge-rectifier and a control terminal which is coupled to control signal of PWM; A main transformer has a primary winding and a secondary winding which is coupled to a secondary circuitry;
a first terminal of said primary winding is coupled to the second terminal of primary winding of the forward transformer;A fourth capacitor has a first terminal is coupled to a second terminal of said primary winding of said forward transformer and a second terminal is coupled to the second terminal of the lower switch; A fifth capacitor has a first terminal which is coupled to the second terminal of the primary winding of the main transformer and the second terminal which is coupled to the negative terminal of the second capacitor and the positive terminal of the third capacitor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. The 120&
- 240V single stage half bridge power factor correction power converter consist of;
A forward transformer has a first PFC winding which has a first terminal, a second terminal and a center-tap, a second PFC winding which has a first terminal, a second terminal and a center-tap and a primary winding which has a first terminal and a second terminal. A first diode has a cathode which is coupled to a first terminal of the first PFC winding of the forward transformer and an anode which is coupled to a first power line. A second diode has a cathode which is coupled to a second terminal of the first PFC winding of the forward transformer and an anode which is coupled to a first power line. A third diode has a cathode which is coupled the first input power line and an anode which is coupled to the first terminal of the second PFC winding of the forward transformer. A fourth diode has cathode which is coupled to the first input power line and a cathode which is coupled to the second terminal of the second PFC winding of the forward transformer. A first capacitor has a positive terminal which is coupled to the center-tap of the first PFC winding and a negative terminal. A second capacitor has a positive terminal which is coupled to the negative terminal of the first capacitor and a negative terminal which is coupled to the center-tap of the second PFC winding. A fifth diode has an anode and a cathode which is coupled to the second terminal of the first PFC winding. A sixth diode has a cathode which is coupled to the second terminal of the first PFC winding and an anode which is coupled to the anodes of the fifth diode. A seventh diode has a cathode which is coupled to the anode of the sixth diode and an anode which is coupled to the second terminal of the second PFC winding. An eighth diode has an anode which is coupled to the first terminal of the second PFC winding and a cathode which is coupled to the anode of the five diode. An inductor has a first terminal which is coupled to a second input AC power line and a second terminal. This inductor also can be connected between the anode of the first diode and the first input AC power line. A switch has a first terminal which is coupled to the second terminal of the inductor, a second terminal which is coupled to the anode of the fifth diode and a third terminal which is coupled to the negative terminal of the first capacitor. A upper transistor switch has a first terminal which is coupled to the positive terminal of the first capacitor, a second terminal which is coupled to the first terminal of the primary winding of the forward transformer and a control terminal which is controlled by a control signal PWM or PFM. A lower transistor switch has a first terminal which is coupled to the second terminal of the upper transistor switch, a second terminal which is coupled to the negative terminal of the second capacitor and a control terminal which is controlled by a control signal PWM or PFM. A main transformer has a secondary winding which is coupled to a secondary circuitry and a primary winding which has a first terminal coupled to the second terminal of the primary winding and a second terminal. A third capacitor has a first terminal which is coupled to the second terminal of the primary winding of the forward transformer and a second terminal which is coupled to the second terminal of the lower transistor switch or the first terminal of the upper transistor switch. A fourth capacitor has a first terminal which is coupled to the second terminal of the primary winding of the main transformer and a second terminal which is coupled to the third terminal of the switch. - View Dependent Claims (8, 9, 10, 11, 12)
- 240V single stage half bridge power factor correction power converter consist of;
Specification