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dc/dc converter

A technology of DC converters and inverters, applied in high-efficiency power electronic conversion, output power conversion devices, conversion equipment with intermediate conversion to AC, etc., to achieve the effects of high efficiency, miniaturization, and surge suppression

Active Publication Date: 2019-08-16
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, on the secondary side of the transformer, a surge voltage is generated due to the influence of the recovery current when the diode of the rectifier circuit is off.

Method used

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Embodiment approach 1

[0045] First, effects obtained by configuring the DC / DC converter in Embodiment 1 will be described. As described above, by configuring the DC / DC converter in Embodiment 1, it is possible to suppress the occurrence of a surge due to the influence of the recovery current, and to achieve high efficiency and downsizing of the device.

[0046] In addition, by configuring the DC / DC converter in the first embodiment, in addition to the above-mentioned effects, other effects can be further obtained. Such other effects will be described in comparison with the prior art described in Patent Documents 2 and 3. FIG.

[0047] Here, in the conventional techniques described in Patent Documents 2 and 3, the occurrence of a surge due to the influence of the recovery current is suppressed by reducing the circulating current flowing through the rectifier circuit.

[0048] However, when the prior art described in Patent Documents 2 and 3 is applied to a DC / DC converter driven by a soft switching m...

Embodiment approach 2

[0114] In Embodiment 1 above, the case where the DC / DC converter 10 is driven by the phase shift soft switching method has been described. In contrast, in Embodiment 2 of the present invention, a case where the DC / DC converter 10 is driven by a hard switching method will be described. In addition, in this Embodiment 2, description of the same point as the previous Embodiment 1 is omitted, and the difference from the previous Embodiment 1 will be mainly described.

[0115] Figure 12 It is a circuit configuration diagram of a DC / DC converter 10A according to Embodiment 2 of the present invention. In addition, in Figure 12 In the figure, as in the previous first embodiment, the DC power supply 20 , the load 30 , and the control circuit 40 for controlling the operation of the DC / DC converter 10A are collectively shown in the figure.

[0116] exist Figure 12 Among them, the DC / DC converter 10A includes an inverter circuit 11 , an insulated transformer 13 , a rectification ci...

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PUM

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Abstract

The present invention is configured by providing a secondary-side return circuit that performs DC / DC conversion on the direct current of the direct-current power supply and outputs it to the output side connected to the rectification circuit having a plurality of rectification semiconductor switching elements. The secondary side of the DC / DC converter of the load connected in series with the filter reactor detours the load current flowing to the load and returns the load current during the period when the voltage of the DC power supply is not applied to the primary side of the transformer. A series circuit in which a secondary-side freewheeling diode and a freewheeling reactor are connected in series.

Description

technical field [0001] The present invention relates to a DC / DC converter in which a primary side and a secondary side are insulated by a transformer, and more particularly to a DC / DC converter having a function of suppressing a surge due to the influence of a recovery current. Background technique [0002] In a conventional power conversion device, the positive and negative rectangular wave pulse trains transmitted from the primary side to the secondary side via a transformer are rectified by a rectifier circuit to convert them into rectangular wave pulse trains of the same polarity. At this time, a surge voltage is generated on the secondary side of the transformer due to the influence of the recovery current when the diode of the rectifier circuit is turned off. Therefore, in order to suppress such a surge voltage, a snubber circuit is provided in the power conversion device. [0003] By providing a snubber circuit like this, the surge voltage generated on the secondary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28
CPCH02M3/28Y02B70/10H02M1/346H02M3/33573H02M3/01H02M1/0058H02M1/08
Inventor 早濑佳
Owner MITSUBISHI ELECTRIC CORP
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