Holdup time circuit and method for bridgeless PFC converter

Patent metadata

Field	Value
Publication number	US-9590495-B2
Application number	US-201113219513-A
Country	US
Kind code	B2
Filing date	Aug 26, 2011
Priority date	Aug 26, 2011
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

An embodiment holdup time circuit of a bridgeless power factor correction circuit comprises a charge device, an energy storage apparatus and a discharge device. The charge device comprises a first terminal coupled to a bridgeless power factor correction circuit and a second terminal coupled to the energy storage apparatus. The discharge device comprises a first terminal coupled to the energy storage apparatus and a second terminal coupled to the bridgeless power factor correction circuit.

First claim

What is claimed is:

1. A circuit comprising:
a charge device comprising
(a) a first terminal coupled to a bridgeless power factor correction circuit; and
(b) a second terminal coupled to an energy storage apparatus;

a discharge device comprising
(a) a third terminal coupled to the energy storage apparatus; and
(b) a fourth terminal coupled to the bridgeless power factor correction circuit;

the energy storage apparatus; and
the bridgeless power factor correction circuit comprising
(a) a first boost converter, a second boost converter and a first switch coupled between an input of the first boost converter of the bridgeless power factor correction circuit and ground; and
(b) a second switch coupled between an input of the second boost converter of the bridgeless power factor correction circuit and ground.

2. The circuit of claim 1 , wherein the charge device is an n-type metal oxide semiconductor transistor coupled between an output of the bridgeless power factor correction circuit and the energy storage apparatus.

3. The circuit of claim 1 , wherein:
the charge device is a diode coupled between an output of a first inductor of the bridgeless power factor correction circuit and the energy storage apparatus; and
the discharge device is an n-type metal oxide semiconductor transistor coupled between an input of a second inductor of the bridgeless power factor correction circuit and the energy storage apparatus.

4. The circuit of claim 1 , wherein:
the charge device is a diode coupled between an output of a second inductor of the bridgeless power factor correction circuit and the energy storage apparatus; and
the discharge device is an n-type metal oxide semiconductor transistor coupled between an input of a first inductor of the bridgeless power factor correction circuit and the energy storage apparatus.

5. The circuit of claim 1 , wherein:
the charge device is a first n-type metal oxide semiconductor transistor coupled between an output of the bridgeless power factor correction circuit and the energy storage apparatus; and
the discharge device is a second n-type metal oxide semiconductor transistor coupled between an input of a first inductor of the bridgeless power factor correction circuit and the energy storage apparatus.

6. The circuit of claim 1 , wherein:
the charge device is a first n-type metal oxide semiconductor transistor coupled between an output of the bridgeless power factor correction circuit and the energy storage apparatus; and
the discharge device is a second n-type metal oxide semiconductor transistor coupled between an input of a second inductor of the bridgeless power factor correction circuit and the energy storage apparatus.

7. The circuit of claim 1 , wherein:
the charge device is a first n-type metal oxide semiconductor transistor coupled between an output of the bridgeless power factor correction circuit and the energy storage apparatus; and
the discharge device is formed by a second n-type metal oxide semiconductor transistor and a third n-type metal oxide semiconductor transistor, wherein
(a) the second n-type metal oxide semiconductor transistor is coupled between an input of a first inductor of the bridgeless power factor correction circuit and the energy storage apparatus; and
(b) the third n-type metal oxide semiconductor transistor is coupled between an input of a second inductor of the bridgeless power factor correction circuit and the energy storage apparatus.

8. A system comprising:
a bridgeless power factor correction circuit comprising
(a) a first boost converter coupled between an input ac source and an output;
(b) a second boost converter coupled between the input ac source and the output;
(c) a first switch coupled between an input of the first boost converter and ground;
(d) a second switch coupled between an input of the second boost converter and ground;
(e) a first surge protection diode coupled between the input of the first boost converter and the output; and
(f) a second surge protection diode coupled between the input of the second boost converter and the output;

a charge device comprising
(a) a first terminal coupled to the bridgeless power factor correction circuit; and
(b) a second terminal coupled to an energy storage apparatus;

a discharge device comprising
(a) a third terminal coupled to the energy storage apparatus; and
(b) a fourth terminal coupled to the bridgeless power factor correction circuit; and

the energy storage apparatus.

9. The system of claim 8 , further comprising a controller having control signal connections to the charge device, the discharge device and the bridgeless power factor correction circuit.

10. The system of claim 9 , wherein the controller is configured to:
turn on the charge device and turn off the discharge device when the input ac source is in normal operation; and
turn on the discharge device and turn off the charge device when the input ac source has a dropout.

11. The system of claim 9 , wherein the controller is configured to:
in a first half cycle of the input ac source, activate the first boost converter and the second switch; and
in a second half cycle of the input ac source, activate the second boost converter and the first switch.

12. The system of claim 8 , wherein:
the charge device is diode coupled between a first inductor of the first boost converter and the energy storage apparatus; and
the discharge device is a switching element coupled between the energy storage apparatus and an input of the second boost converter.

13. The system of claim 8 , wherein:
the charge device is diode coupled between a second inductor of the second boost converter and the energy storage apparatus; and
the discharge device is a switching element coupled between the energy storage apparatus and an input of the first boost converter.

14. The system of claim 8 , wherein:
the charge device is a first switching element coupled between an output of the bridgeless power factor correction circuit and the energy storage apparatus; and
the discharge device is a second switching element coupled between the energy storage apparatus and an input of the bridgeless power factor correction circuit.

15. The system of claim 8 , wherein:
the charge device is a first switching element coupled between an output of the bridgeless power factor correction circuit and the energy storage apparatus; and
the discharge device is formed by a second switching element and a third switching element wherein
the second switching element is coupled between the energy storage apparatus and a first input of the bridgeless power factor correction circuit; and
the third switching element is coupled between the energy storage apparatus and a second input of the bridgeless power factor correction circuit.

16. A method comprising:
charging an energy storage apparatus through a charge device, wherein the charge device is coupled between a bridgeless power factor correction circuit and the energy storage apparatus;
detecting a dropout of an input ac source; and
discharging the energy storage apparatus through a discharge device, wherein the discharge device is coupled between the energy storage apparatus and an input of the bridgeless power factor correction circuit.

17. The method of claim 16 , further comprising:
detecting a first half cycle of the input ac source;
activating a first boost converter and a second switch coupled between an input of a second boost converter and ground; and
charging the energy storage apparatus from the first boost c

Assignees

• Fu Dianbo
• Mao Hengchun
• Cai Bing
• Futurewei Technologies Inc

Inventors

• Fu Dianbo
• Mao Hengchun
• Cai Bing

Classifications

• H02M1/32

  Means for protecting converters other than automatic disconnection · CPC title

• H02M5/293

  using semiconductor devices only · CPC title

• H02M5/20

  using discharge tubes without control electrode or semiconductor devices without control electrode · CPC title

• H02M1/4225 Primary

  using a non-isolated boost converter · CPC title

• Y02B70/126

  Cross-Sectional Technologies · mapped topic