FULL-BRIDGE ELECTRONIC BALLAST HAVING SIMPLIFIED CONTINUOUS-CONDUCTION-MODE CHARGE PUMP PFC CIRCUIT

• US 20120086350A1
• Filed: 10/12/2011
• Published: 04/12/2012
• 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
• Granted Patent: US 9,013,111 B2
• Time in Patent Office: Days
• 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 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 coupled to the second output terminal of the filter circuit, and a first output terminal;

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

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

a second inductor having a first terminal;

a first capacitor having a first terminal coupled to the first terminal of the first inductor and a second terminal coupled to the anode of the first diode and the first terminal of the second inductor; and

a second diode having a cathode coupled to the first terminal of the second 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 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 and 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 and has a second bypass diode, the continuous-conduction-mode charge pump PFC circuit further includes a third diode having an anode coupled to the first terminal of the first capacitor and a cathode coupled to the cathode of the first diode, the second inductor has a second terminal coupled to the middle point of the full-bridge inverter, the cathode of the first 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 diode, the first bypass diode of the first switch, the second bypass diode of the second switch and a fourth diode, the second diode further comprises an anode coupled to the second input terminal of the full-bridge inverter, and the second 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 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 capacitor having a first terminal coupled to the first terminal of the second inductor, and a second terminal coupled to the anode of the second 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 inductor having a first terminal coupled to the first input terminal of the rectifier circuit, and a second terminal;

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; and

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

6. An electronic ballast according to claim 5 further comprising a filter circuit 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 inductor is coupled to the first output terminal of the filter circuit.

7. An electronic ballast according to claim 5 further comprising a first and a second 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 diode is coupled to the first output terminal of the rectifier circuit, the anode of the first diode is coupled to the second terminal of the first capacitor, the cathode of the second diode is coupled to the first terminal of the second inductor, and the anode of the second diode is coupled to the second output terminal of the rectifier circuit.

8. An electronic ballast according to claim 7, wherein the full-bridge inverter has a first and a second input terminals and a middle point, the second inductor has a second terminal coupled to the middle point, the cathode of the first 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.

9. An electronic ballast, comprising:

a continuous-conduction-mode charge pump PFC circuit; and

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

10. An electronic ballast according to claim 9, wherein the continuous-conduction-mode charge pump PFC circuit further comprises a first inductor and a second inductor.

11. An electronic ballast according to claim 10 further comprising 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 first capacitor and a second capacitor, the first inductor has a first terminal coupled to the first input terminal of the rectifier circuit and has a second terminal coupled to the first output terminal of the filter circuit, the first capacitor has a first terminal, the second capacitor has a first terminal coupled to the first terminal of the first capacitor and has a second terminal, and the second inductor has a first terminal coupled to the second terminal of the second capacitor.

12. An electronic ballast according to claim 10 further comprising a filter circuit 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 inductor is coupled to the first output terminal of the filter circuit.

13. An electronic ballast according to claim 10, wherein the rectifier circuit further has a first output terminal, the first capacitor further has a second terminal 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.

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