Parallel Hybrid Converter Apparatus and Method

• US 20200136517A1
• Filed: 12/24/2019
• Published: 04/30/2020
• Est. Priority Date: 11/20/2014
• Status: Active Grant

• Current Assignee: Huawei Digital Power Technologies Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Dai, Heping, Ye, Liming, Fu, Dianbo, Chen, Daoshen
• Granted Patent: US 11,909,326 B2
• Time in Patent Office: Days
• CPC Class Codes: H02M 1/0058 by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826
• CPC Class Codes: H02M 1/007 Plural converter units in cascade push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/07 using capacitors charged and discharged alternately by semiconductor devices with control electrode , e.g. charge pumps
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence
• CPC Class Codes: H02M 3/18 using capacitors or batteries which are alternately charged and discharged, e.g. charged in parallel and discharged in series
• CPC Class Codes: H02M 3/33571 Half-bridge at primary side of an isolation transformer
• CPC Class Codes: H02M 3/33573 Full-bridge at primary side of an isolation transformer
• CPC Class Codes: H02M 3/33576 having at least one active switching element at the secondary side of an isolation transformer
• CPC Class Codes: H02M 3/3372 of the parallel type
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

An apparatus includes an isolated power converter having an input connected to an input dc power source, a first output and a second output, and a non-isolated power converter having an input connected to the second output of the isolated power converter, wherein the first output of the isolated power converter and an output of the non-isolated power converter are connected in series.

Claims

1. An apparatus comprising:

an isolated power converter having an input connected to an input dc power source, a first output and a second output; and

a non-isolated power converter having an input connected to the second output of the isolated power converter, wherein the first output of the isolated power converter and an output of the non-isolated power converter are connected in series.

2. The apparatus of claim 1, wherein:

the non-isolated power converter is a four-switch buck-boost converter; and

the isolated power converter is an inductor-inductor-capacitor (LLC) resonant converter.

3. The apparatus of claim 1, wherein the isolated power converter comprises:

a first secondary winding, a first resonant tank, a first secondary switch network and a first output capacitor connected in cascade; and

a second secondary winding, a second resonant tank, a second secondary switch network and a second output capacitor connected in cascade.

4. The apparatus of claim 3, wherein:

the non-isolated power converter is connected between the second output capacitor and a third output capacitor, and wherein the first output capacitor and the third output capacitor are connected in series and further connected to a load.

5. The apparatus of claim 3, wherein:

a power delivered by the second secondary switch network is a fraction of a power delivered by the first secondary switch network.

6. The apparatus of claim 3, wherein the second secondary switch network comprises:

a first switch and a second switch connected in series between two terminals of the second output capacitor; and

a first capacitor and a second capacitor connected in series between the two terminals of the second output capacitor, and wherein the second secondary winding is coupled to a common node of the first switch and the second switch, and a common node of the first capacitor and the second capacitor, respectively.

7. The apparatus of claim 1, wherein:

the isolated power converter is an LLC resonant converter configured to operate at a switching frequency approximately equal to a resonant frequency of the LLC resonant converter.

8. The apparatus of claim 1, wherein:

the isolated power converter is configured as an unregulated power converter.

9. The apparatus of claim 1, wherein the isolated power converter comprises a transformer comprising:

a primary winding connected to the input of the isolated power converter through a primary switch network;

a first secondary winding coupled to the first output of the isolated power converter; and

a second secondary winding coupled to the second output of the isolated power converter.

10. The apparatus of claim 1, wherein the isolated power converter comprises a transformer comprising:

a primary winding connected to the input of the isolated power converter through a primary switch network;

a first center-tapped secondary winding coupled to the first output of the isolated power converter; and

a second center-tapped secondary winding coupled to the second output of the isolated power converter.

11. A system comprising:

a first power delivery route comprising a switch network, a transformer, a first rectifier and an output filter; and

a second power delivery route comprising the switch network, the transformer, a second rectifier and a non-isolated power converter.

12. The system of claim 11, wherein:

a power flowing through the second power delivery route is a fraction of a power flowing through the first power delivery route.

13. The system of claim 11, wherein:

a first terminal of the output filter is connected to a positive terminal of a load;

a second terminal of the output filter is connected to a first output terminal of the non-isolated power converter; and

a second output terminal of the non-isolated power converter is connected to a negative terminal of the load.

14. The system of claim 11, wherein:

the switch network, the transformer, the transformer, the first rectifier and the second rectifier form a dual-output isolated power converter.

15. The system of claim 11, wherein:

the non-isolated power converter is a buck-boost power converter.

16. A system comprising:

a primary switch network configured to be connected to a power source;

a transformer having a first secondary winding, a second secondary winding and a primary winding, the primary winding being connected to the primary switch network;

a first rectifier connected to the first secondary winding through a first resonant tank;

a second rectifier connected to the second secondary winding through a second resonant tank;

an output filter connected to the first rectifier; and

a power converter connected to the second rectifier, wherein outputs of the output filter and the power converter are connected in series.

17. The system of claim 16, wherein:

the primary switch network, the transformer, the first resonant tank, the second resonant tank, the first rectifier and the second rectifier form an inductor-inductor-capacitor (LLC) resonant converter.

18. The system of claim 16, wherein:

a power flowing through the second rectifier is a fraction of a power flowing through the first rectifier.

19. The system of claim 16, wherein:

the primary switch network is a full-bridge.

20. The system of claim 16, wherein:

the power converter is a buck-boost converter.