Full-bridge electronic ballast having simplified continuous-conduction-mode charge pump PFC circuit

• US 9,013,111 B2
• Filed: 10/12/2011
• Issued: 04/21/2015
• Est. Priority Date: 10/12/2010
• Status: Active Grant

• Current Assignee: National Cheng KUNG University (Government of The Republic of China)
• Original Assignee: National Cheng KUNG University (Government of The Republic of China)
• Inventors: Lin, Ray-Lee, Chang, Jung-Wei
• Primary Examiner(s): Owens, Douglas W
• Assistant Examiner(s): King, Monica C
• Application Number:
  US13/271,714
• Publication Number:
  US 20120086350A1
• Time in Patent Office: 1,287 Days
• Field of Search: 315/200.R, 315201-208
• US Class Current: 315/200.R
• CPC Class Codes: H05B 41/28 using static converters
• CPC Class Codes: H05B 41/2828 using control circuits for the switching elements H05B41/2827 takes precedence

Abstract

The configurations of an electronic ballast are provided in the present invention. The proposed electronic ballast includes a filter circuit having a first and a second output terminals, a rectifier circuit having a first input terminal, a second input terminal coupled to the second output terminal of the filter circuit, and a first output terminal, and a continuous-conduction-mode charge pump PFC circuit including a first inductor having a first terminal coupled to the first input terminal and a second terminal coupled to the first output terminal of the filter circuit, a second inductor having a first terminal and a first capacitor having a first terminal coupled to the first terminal of the first inductor and a second terminal coupled to the first terminal of the second inductor.

Claims

1. An electronic ballast, comprising:

a filter circuit including a filter circuit inductor and a filter circuit capacitor and having a first and a second output terminals and receiving an AC input voltage;

a rectifier circuit having a first input terminal, a second input terminal and a first output terminal, wherein the second input terminal is coupled to the second output terminal of the filter circuit;

a continuous-conduction-mode charge pump PFC circuit, comprising;

a first PFC circuit inductor having a first terminal coupled to the first input terminal of the rectifier circuit, and a second terminal coupled to the first output terminal of the filter circuit;

a first PFC circuit diode having an anode and a cathode, wherein the cathode is coupled to the first output terminal of the rectifier circuit;

a second PFC circuit inductor having a first terminal;

a first PFC circuit capacitor having a first terminal and a second terminal, wherein the first terminal of the first PFC circuit capacitor is directly electrically connected to the first terminal of the first PFC circuit inductor, and the second terminal of the first PFC circuit capacitor is directly electrically connected to the anode of the first PFC circuit diode and the first terminal of the second PFC circuit inductor; and

a second PFC circuit diode having a cathode directly electrically connected to the first terminal of the second PFC circuit inductor; and

a full-bridge inverter coupled to the continuous-conduction mode charge pump PFC circuit and generating an AC output voltage.

2. An electronic ballast according to claim 1 further comprising a second PFC circuit capacitor, wherein the rectifier circuit further comprises a second output terminal, the full-bridge inverter has a first and a second input terminals, a middle point, a first and a second output terminals and a bridge arm, the bridge arm includes a first switch and a second switch, the first switch of the bridge arm is coupled to the first input terminal of the full-bridge inverter and the middle point, the first switch of the bridge arm has a first bypass diode, the second switch of the bridge arm is coupled to the middle point and the second input terminal of the full-bridge inverter, the second switch of the bridge arm has a second bypass diode, the continuous-conduction-mode charge pump PFC circuit further includes a third PFC circuit diode having an anode and a cathode, the anode of the third PFC circuit diode is coupled to the first terminal of the first PFC circuit capacitor, the cathode of the third PFC circuit diode is coupled to the cathode of the first PFC circuit diode, the second PFC circuit inductor has a second terminal coupled to the middle point of the full-bridge inverter, the cathode of the first PFC circuit diode is coupled to the first input terminal of the full-bridge inverter, the second input terminal of the full-bridge inverter is coupled to the second output terminal of the rectifier circuit, the rectifier circuit comprises the third PFC circuit diode, the first bypass diode of the first switch, the second bypass diode of the second switch and a fourth PFC circuit diode, the second PFC circuit diode further comprises an anode coupled to the second input terminal of the full-bridge inverter, and the second PFC circuit capacitor is electrically connected to the first and the second output terminals of the full-bridge inverter in parallel.

3. An electronic ballast according to claim 2, wherein the second PFC circuit capacitor is an output capacitor, and the continuous-conduction-mode charge pump PFC circuit is a continuous-conduction-mode voltage-source charge pump PFC circuit.

4. An electronic ballast according to claim 2, wherein the continuous-conduction-mode charge pump PFC circuit further comprises a third PFC circuit capacitor having a first terminal coupled to the first terminal of the second PFC circuit inductor, and a second terminal coupled to the anode of the second PFC circuit diode.

5. An electronic ballast, comprising:

a rectifier circuit having a first input terminal and a second input terminal;

a continuous-conduction-mode charge pump PFC circuit, comprising;

a first PFC circuit inductor having a first terminal and a second terminal, wherein the first terminal of the first inductor is coupled to the first input terminal of the rectifier circuit;

a second PFC circuit inductor having a first terminal; and

a first PFC circuit capacitor having a first terminal and a second terminal, wherein the first terminal of the first PFC circuit capacitor is directly electrically connected to the first terminal of the first PFC circuit inductor, and the second terminal of the first PFC circuit capacitor is directly electrically connected to the first terminal of the second PFCF circuit inductor;

a full-bridge inverter coupled to the continuous-conduction-mode charge pump PFC circuit and generating an AC output voltage; and

a filter circuit including a filter circuit inductor and a filter circuit capacitor and having a first and a second output terminals and receiving an AC input voltage, wherein the second input terminal of the rectifier circuit is coupled to the second output terminal of the filter circuit, and the second terminal of the first PFC circuit inductor is coupled to the first output terminal of the filter circuit.

6. An electronic ballast according to claim 5 further comprising a first and a second PFC circuit diodes, each of which comprises an anode and a cathode, wherein the rectifier circuit further comprises a first and a second output terminals, the cathode of the first PFC circuit diode is coupled to the first output terminal of the rectifier circuit, the anode of the first PFC circuit diode is coupled to the second terminal of the first PFC circuit capacitor, the cathode of the second PFC circuit diode is coupled to the first terminal of the second PFC circuit inductor, and the anode of the second PFC circuit diode is coupled to the second output terminal of the rectifier circuit.

7. An electronic ballast according to claim 6, wherein the full-bridge inverter has a first and a second input terminals and a middle point, the second PFC circuit inductor has a second terminal coupled to the middle point, the cathode of the first PFC circuit diode is coupled to the first input terminal of the full-bridge inverter, and the second input terminal of the full-bridge inverter is coupled to the second output terminal of the rectifier circuit.

8. An electronic ballast, comprising:

a continuous-conduction-mode charge pump PFC circuit, comprising;

a first PFC circuit inductor having a first terminal;

a second PFC circuit inductor having a first terminal; and

a first PFC circuit capacitor having a first terminal and a second terminal, wherein the first terminal of the first PFC circuit capacitor is directly electrically connected to the first terminal of the first PFC circuit inductor, and the second terminal of the first PFC circuit capacitor is directly electrically connected to the first terminal of the second PFC circuit inductor;

a full-bridge inverter coupled to the continuous-conduction-mode charge pump PFC circuit and generating an AC output voltage;

a rectifier circuit having a first input terminal and a second input terminal, wherein the continuous-conduction-mode charge pump PFC circuit further comprises a second PFC circuit capacitor, the first terminal of the first PFC circuit inductor is coupled to the first input terminal of the rectifier circuit, the second PFC circuit capacitor has a first terminal coupled to the first terminal of the first PFC circuit capacitor and has a second terminal, and the first terminal of the second PFC circuit inductor is coupled to the second terminal of the second PFC circuit capacitor; and

a filter circuit including a filter circuit inductor and a filter circuit capacitor and having a first and a second output terminals and receiving an AC input voltage, wherein the second input terminal of the rectifier circuit is coupled to the second output terminal of the filter circuit, and the first PFC circuit inductor further has a second terminal coupled to the first output terminal of the filter circuit.

9. An electronic ballast according to claim 8, wherein the rectifier circuit further has a first output terminal, the second terminal of the first PFC circuit capacitor is coupled to the first output terminal of the rectifier circuit, and the continuous-conduction-mode charge pump PFC circuit is a continuous-conduction-mode current-source charge pump PFC circuit.

10. An electronic ballast according to claim 8, wherein the rectifier circuit further has a first and a second output terminals, and the second terminal of the first PFC circuit capacitor is coupled to the second output terminal of the rectifier circuit.