# US 2020/0287461 A1 · Dc-dc converter

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- Number: US 2020/0287461 A1
- Document ID: US20200287461A1
- Status: Published application
- Kind: A1
- Application number: 16/308,599
- Filed: 2018-05-25
- Published: 2020-09-10
- Earliest claimed: 2017-12-29
- Assignees: Huazhong University of Science and Technology
- Applicants: Huazhong University of Science and Technology
- Inventors: Xudong ZOU; Shuang LIU; Qingbo TANG; Wenchao JIANG; Changle XU; Weibin JIANG
- Web page: https://patentgrep.com/patent/US20200287461A1

## CPC

- H02M 3/1582: {Buck-boost converters (H02M3/1584 takes precedence)}
- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- H02M 3/33569: {having several active switching elements (H02M3/3353 takes precedence)}
- 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)}
- H02M 1/0067: {Converter structures employing plural converter units, other than for parallel operation of the units on a single load}
- 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)}
- H02M 1/083: {for the ignition at the zero crossing of the voltage or the current}
- 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
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

The present invention discloses a DC-DC converter, comprising: an inductor, a rectifier module, a first bridge arm topology and a second bridge arm topology and a third bridge arm topology in parallel as well as a capacitor, wherein the first bridge arm topology includes a first switching tube and a fourth switching tube in series, the second bridge arm topology includes a second switching tube and a fifth switching tube in series, and the third bridge arm topology includes a third switching tube and a sixth switching tube in series; the inductor has one end connected to a coupling point formed by connecting the first switching tube and the fourth switching tube in series, and the other end connected to a coupling point formed by connecting the second switching tube and the fifth switching tube in series; the first bridge arm topology and the inductor constitute a Buck converter, the second bridge arm topology and the inductor constitute a Boost converter, and the second bridge arm topology, the third bridge arm topology and the rectifier module constitute a phase-shifted full-bridge converter. The topology multiplexes the inductor and the second bridge arm topology, thereby achieving multiple input and output ports while enabling soft switching of each switching tube.

## Claims

### Claim 1

A DC-DC converter, characterized by comprising: an inductor, a rectifier module, a first bridge arm topology and a second bridge arm topology and a third bridge arm topology in parallel as well as a capacitor, wherein the first bridge arm topology includes a first switching tube and a fourth switching tube in series, the second bridge arm topology includes a second switching tube and a fifth switching tube in series, and the third bridge arm topology includes a third switching tube and a sixth switching tube in series; a negative pole of the first bridge arm topology is connected to a negative pole of the second bridge arm topology, and the inductor has one end connected to a coupling point formed by connecting the first switching tube and the fourth switching tube in series, and the other end connected to a coupling point formed by connecting the second switching tube and the fifth switching tube in series;
an input end of the rectifier module has one end connected to the coupling point formed by connecting the second switching tube and the fifth switching tube in series, and the other end connected to a coupling point formed by connecting the third switching tube and the sixth switching tube in series, and the rectifier module is used to convert an alternating current into a direct current; there is a phase difference between a control signal of the second bridge arm topology and a control signal of the third bridge arm topology;
the first bridge arm topology and the inductor constitute a Buck converter for stepping down an input voltage, the second bridge arm topology and the inductor constitute a Boost converter for stepping up an input voltage, and the second bridge arm topology, the third bridge arm topology and the rectifier module constitute a phase-shifted full-bridge converter for stepping down or stepping up an input voltage; the DC-DC converter multiplexes the inductor and the second bridge topology.

### Claim 2 (depends on 1)

The DC-DC converter of claim 1, characterized in that two ends of the first bridge arm topology serve as an DC input end of the DC-DC converter, the capacitor serves as a first DC output end of the DC-DC converter, and an output end of the rectifier module serves as a second DC output end of the DC-DC converter.

### Claim 3 (depends on 1)

The DC-DC converter of claim 1, characterized in that two ends of the first bridge arm topology serve as a first DC input end of the DC-DC converter, the capacitor serves as a second DC input end of the DC-DC converter, and an output end of the rectifier module serves as a first DC output end of the DC-DC converter.

### Claim 4 (depends on 1)

The DC-DC converter of claim 1, characterized in that the rectifier module comprises a transformer and two rectifier diodes, a primary side of the transformer serves as the input end of the rectifier module, taps on both ends of a secondary side of the transformer are each connected in series with a rectifier diode, the other ends of the two rectifier diodes are connected as a first port of the output end of the rectifier module, and a center tap of the transformer serves as a second port of the output end of the rectifier module.

### Claim 5 (depends on 1)

The DC-DC converter of claim 1, characterized in that each of the switching tubes of the first bridge arm topology is connected in parallel with a diode and a capacitor to enable soft switching of the switching tubes in the first bridge arm topology.

### Claim 6 (depends on 1)

The DC-DC converter of claim 1, characterized by further comprising a resonant inductor and a DC blocking capacitor, wherein the resonant inductor, the primary coil of the transformer and the DC blocking capacitor are sequentially connected in series to form a series branch, the series branch has one end connected to the coupling point formed by connecting the second switching tube and the fifth switching tube in series and the other end connected to the coupling point formed by connecting the third switching tube and the sixth switching tube in series, and each of the switching tubes of the second bridge arm topology and the third bridge arm topology is connected in parallel with a diode and a capacitor to enable soft switching of each of the switching tubes of the second bridge arm topology and the third bridge arm topology.

### Claim 7 (depends on 5)

The DC-DC converter of claim 5, characterized in that the diodes and capacitors connected in parallel with the switching tubes are parasitic devices or external devices of the switching tubes.

### Claim 8 (depends on 1)

The DC-DC converter of claim 1, characterized in that the DC-DC converter further includes an output filter; the output filter includes a filter inductor and a filter capacitor;
the filter inductor has one end connected to a first terminal of the output end of the rectifier module, and the other end serving as a first terminal of the DC output end of the DC-DC converter;
the filter capacitor has one end connected to the other end of the filter inductor and the other end connected to a second terminal of the output end of the rectifier module, the other end of the filter capacitor serving as a second terminal of the DC output end of the DC-DC converter.

### Claim 9 (depends on 1)

The DC-DC converter of claim 1, characterized in that the DC-DC converter further includes a converter filter capacitor which is connected in parallel to the first bridge arm topology and used for smoothing a voltage.