Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • 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
  • H02M3/00—Conversion of dc power input into dc power output
  • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
  • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
  • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
  • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
  • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
  • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
  • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
  • H02M3/33584—Bidirectional converters

Definitions

• the present disclosure generally relates to a converter, and more particularly to a DC/DC bidirectional converter.
• a DC/DC bidirectional converter is configured to realize a buck or a boost function.
• the DC/DC bidirectional converter adopts an extra boost circuit to realize the boost function and an extra buck circuit to realize the buck function.
• the extra boost circuit and buck circuit may result in a large size, a heavy weight and a high cost of the DC/DC bidirectional converter.
• a DC/DC bidirectional converter may need to be provided, which may reduce a size, a weight and a cost of the DC/DC bidirectional converter.
• a DC/DC bidirectional converter may comprise: a first transformer with a variable turns ratio, a second transformer with a variable turns ratio, a first switch, a second switch, a high voltage control module and a low voltage control module.
• the first switch and the second switch are configured to switch on alternately to control the turns ratio of the first transformer and the turns ratio of the second transformer, in which a secondary coil of the first transformer and a secondary coil of the second transformer are connected via the first switch or the second switch.
• the high voltage control module is used for high voltage AC/DC conversion.
• the high voltage control module has a first terminal for inputting and outputting a high voltage and a second terminal connected with the secondary coil of the second transformer and the secondary coil of the first transformer respectively.
• the low voltage control module is used for low voltage AC/DC conversion.
• the low voltage control module has a fourth terminal for inputting and outputting a low voltage and a third terminal connected with a primary coil of the first transformer and a primary coil of the second transformer respectively.
• the DC/DC bidirectional converter by varying the turns ratio of the first transformer and the turns ratio of the second transformer, a boost and buck function may be realized without any extra boost circuit or buck circuit.
• the DC/DC bidirectional converter has advantages of small size, light weight and low cost. Because the DC/DC bidirectional converter adopts two transformers to share a total power, a size of a single transformer can be reduced, and the size of the DC/DC bidirectional converter is reduced accordingly. In addition, the DC/DC bidirectional converter with a small size also has advantages of easy control, high efficiency and good reliability.
• Fig. 1 is a schematic diagram view showing a structure of a DC/DC bidirectional converter according to an exemplary embodiment of the present disclosure.
• Fig. 2 is a schematic diagram showing a circuit of the DC/DC bidirectional converter according to an exemplary embodiment of the present disclosure.
• the DC/DC bidirectional converter may comprise a first transformer Tl with a variable turns ratio, a second transformer T2 with a variable turns ratio, a first switch Kl, a second switch K2, a high voltage control module 1 and a low voltage control module 2.
• the first switch Kl and the second switch K2 are configured to switch on alternately to control the turns ratio of the first transformer Tl and the turns ratio of the second transformer T2.
• a secondary coil of the first transformer Tl and a secondary coil of the second transformer T2 are connected via the first switch Kl or the second switch K2.
• the high voltage control module 1 is used for high voltage AC/DC conversion.
• the high voltage control module 1 has first terminals (V1+ and V1-) for inputting and outputting a high voltage respectively, and second terminals connected with the secondary coil of the second transformer T2 and the secondary coil of the first transformer Tl respectively.
• the low voltage control module 2 is used for low voltage AC/DC conversion.
• the low voltage control module 2 has fourth terminals (V2+ and V2-) for inputting and outputting a low voltage respectively, and third terminals connected with a primary coil of the first transformer Tl and a primary coil of the second transformer T2 respectively.
• the high voltage may range from about 330V to about 570V, and the low voltage may range from about 9V to about 16V.
• the secondary coil of the first transformer Tl may comprise a first coil LI and a second coil L2.
• a first end of the first coil LI and a first end of the second coil L2 are led out as a first common terminal.
• the secondary coil of the second transformer T2 may comprise a third coil L3 and a fourth coil L4.
• a first end of the third coil L3 and a first end of the fourth coil L4 are led out as a second common terminal.
• the second terminal of the high voltage control module 1 is connected with a second end of the first coil LI and a second end of the third coil L3 respectively.
• a first end of the first switch Kl is connected with the first common terminal, and a second end of the first switch Kl is connected with the second common terminal.
• a first end of the second switch K2 is connected with a second end of the second coil L2 and a second end of the second switch K2 is connected with a second end of the fourth coil L3.
• Fig. 2 is a schematic circuit diagram showing the DC/DC bidirectional converter according to an exemplary embodiment of the present disclosure.
• the low voltage control module 1 comprises a first push-pull circuit and a second push-pull circuit.
• the first push-pull circuit is connected to the primary coil of the first transformer Tl
• the second push-pull circuit is connected to the primary coil of the second transformer T2
• the first push-pull circuit and the second push-pull circuit are connected in parallel.
• the first push-pull circuit may comprise a first transistor Q5 and a second transistor Q6, and the second push-pull circuit may comprise a third transistor Q7 and a fourth transistor Q8.
• the high voltage control module 1 is a phase-shift full bridge circuit, which may comprise a first IGBT Ql, a second IGBT Q2, a third IGBT Q3 and a fourth IGBT Q4.
• the first IGBT Ql, the second IGBT Q2, the third IGBT Q3 and the fourth IGBT Q4 forming a bridge connection are used as a switch.
• the phase-shift full bridge circuit may adopt a MOSFET as the switch.
• an input terminal of the phase-shift full bridge circuit is the first terminal of the high voltage control module 1
• an output terminal of the phase-shift full bridge circuit is the second terminal of the high voltage control module 1.
• first transformer Tl and the second transformer T2 may have a same parameter, such as a transformation ratio, a power rating, a frequency characteristic and an efficiency.
• a boost process and a buck process of the DC/DC bidirectional converter will be described in detail as follows.
• the first switch Kl switches on and the second switch K2 switches off, so that the first coil LI of the first transformer Tl and the third coil L3 of the second transformer T2 are selected to work, that is, the first coil LI and the third coil L3 are connected in series.
• a high voltage DC (direct current ) electricity inputted from the first terminal of the high voltage control module 1 is converted into a high voltage AC (alternating current ) electricity via the phase-shift full bridge circuit, then is bucked via the first transformer Tl and the second transformer T2 to be inputted to the third terminal of the low voltage control module 2, and then is converted back into a low voltage DC electricity via the first push-pull circuit and the second push-pull circuit to be outputted from the fourth terminal of the low voltage control module 2.
• the first switch Kl switches off and the second switch K2 switches on, so that the secondary coil of the first transformer Tl and the secondary coil of the second transformer T2 are connected in series.
• a low voltage DC electricity inputted from the fourth terminal of the low voltage control module 2 is converted into a low voltage AC electricity via the first push-pull circuit and the second push-pull circuit, then is boosted via the first transformer Tl and the second transformer T2 to be inputted to the second terminal of the high voltage control module 1, and then is converted back into a high voltage DC electricity via the phase-shift full bridge circuit to be outputted from the first terminal of the high voltage control module 1.
• the boost and buck function may be realized without any extra boost circuit or buck circuit.
• the DC/DC bidirectional converter has advantages of small size, light weight and low cost. Because the DC/DC bidirectional converter adopts two transformers to share a total power, a size of a single transformer can be reduced, and the size of the DC/DC bidirectional converter is reduced accordingly. In addition, the DC/DC bidirectional converter with a small size also has advantages of easy control, high efficiency and good reliability.

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Citations (3)

• 2011
  • 2011-11-25 CN CN 201120475396 patent/CN202374182U/zh not_active Expired - Lifetime
• 2012
  • 2012-11-21 WO PCT/CN2012/084942 patent/WO2013075623A1/en active Application Filing

Patent Citations (3)

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