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Bidirectional direct-current converter

A bidirectional DC conversion and DC terminal technology, applied in the field of converters, can solve the problems of affecting the transmission efficiency of the transformer and increasing the current of the switching element of the bridge arm, so as to achieve the effect of improving the efficiency of the transformer, limiting the voltage peak, and reducing the leakage inductance of the transformer

Inactive Publication Date: 2014-11-12
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the switching element for realizing soft switching action has a strong dependence on the active clamp switching element, and the active clamp switching element itself is hard off, thus additionally increasing the current of the bridge arm switching element
As an improvement, Tsai-Fu Wu, Yung-Chu Chen et al proposed an isolated bidirectional DC converter (see "Isolated bidirectional full-bridge DC-DC converter with a flyback snubber" Power Electronics, IEEE Transactions on, vol. 25, pp.1915-1922, 2010), the converter achieves soft switching by using a flyback clamp circuit to cooperate with the leakage inductance in the transformer, although this clamp circuit is independent from the power circuit and clamps the voltage It can be set, but the realization of soft switching of the switching elements of the bridge arm still requires the realization of the transformer leakage inductance, which will affect the transmission efficiency of the transformer to a certain extent

Method used

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Embodiment 1

[0044] The following will refer to Figure 2-Figure 39 A first embodiment of the present application is described.

[0045] figure 2 A circuit diagram of a bidirectional DC converter according to the first embodiment of the present application is shown.

[0046] In the first embodiment of the present application, the bidirectional DC converter includes a primary side DC terminal 1, a primary side inverter / rectification module 2, an isolation transformer 3, a secondary side rectification / inversion module 4, and a secondary side DC terminal 6 .

[0047] Such as figure 2 As shown, the primary-side inverter / rectifier module 2 includes a first bridge arm and a clamping circuit. The first bridge arm consists of switching elements connected in series S 1 and S 2 Composed of, and through the high-voltage terminal capacitor C in parallel with it A Receive the voltage V of the DC terminal of the primary side A . The clamping circuit consists of a resonant inductor Lr and a se...

Embodiment 2

[0144] In the first embodiment, it is described that the two-terminal lagging arm of the isolation transformer located on the primary side (that is, the switching element S in the primary side inverter / rectifier module 1 and S 2 The working state of the circuit structure composed of the first bridge arm). In the second embodiment of the present application, the isolation transformer can also be connected to the super forearm, and the circuit structure is as follows Figure 40 shown. The circuit connection relationship in the bidirectional DC converter in this embodiment and figure 2 The first embodiment shown is basically the same, except that the first bridge arm is composed of switching elements S connected in series 3 and S 4 Composed of, the second bridge arm is composed of switching elements S connected in series 1 and S 2 Composed, and the second bridge arm is coupled to the two ends of the isolation transformer T on the primary side as the leading bridge arm. Si...

Embodiment 3

[0182] Figure 43 A circuit structure diagram of a bidirectional DC converter according to the third embodiment of the present application is shown. like Figure 43 As shown, except for the primary-side inverter / rectifier module, the circuit structure of the bidirectional DC converter of this embodiment is the same as figure 2 The bidirectional DC converter shown is basically the same. In this embodiment, the primary-side inverter / rectifier module includes figure 2 In addition to the first bridge arm and the clamping circuit shown in , it also includes a capacitor C connected in series 3 and C 4 composed of capacitive bridge arms. The capacitor bridge arm, the first bridge arm and the clamping bridge arm are connected in parallel to the DC terminal 1 of the primary side, one end of the winding on the primary side of the transformer is connected to the midpoint C of the clamping bridge arm, and the other end is connected to the capacitor bridge arm midpoint B of .

[0...

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Abstract

The present disclosure discloses a bi-directional DC-DC converter, comprising a primary-side inverting / rectifying module, an isolated transformer, and a secondary-side rectifying / inverting module, wherein the primary-side inverting / rectifying module comprises a first bridge arm composed of a first switching component and a second switching component connected in series and a clamping circuit comprising a resonant inductor and a clamping bridge arm composed of a first semiconductor component and a second semiconductor component connected in series, and two terminals of the resonant inductor are respectively coupled to a common node of the first switching component and the second switching component and a common node of the first semiconductor component and the second semiconductor component. The present disclosure can improve transformer efficiency while achieving the soft switching of the switching components.

Description

technical field [0001] The present application relates to the field of converters, in particular to a bidirectional DC converter. Background technique [0002] The isolated bidirectional DC converter has an important application in electronic equipment with battery energy storage, etc., and plays the role of a bridge for energy exchange between the battery and the DC bus. There are still some technical problems in the application of low-voltage terminal current-type high-voltage terminal voltage-type isolated bidirectional DC converters. [0003] For example, in applications such as using a battery as a backup power source, since the battery voltage is generally lower than the DC bus voltage, the bidirectional DC converter plays the role of charging and discharging the battery. Compared with the non-isolated bidirectional DC converter, the isolated bidirectional DC converter has an electrical isolation effect on the one hand, and can better complete a higher transformation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33538H02M3/337H02M3/33584Y02B70/10
Inventor 言超陈密阳彩
Owner DELTA ELECTRONICS INC
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