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Power converter

A technology of power converters and transformers, which is applied in the direction of high-efficiency power electronic conversion, adjustment of electric variables, instruments, etc., and can solve problems such as increased power loss, reduced efficiency of power converters, and uncontrolled rectification

Inactive Publication Date: 2004-12-01
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, while the diode can rectify without control, it will also increase the power loss caused by the voltage drop in the forward direction, reducing the efficiency of the power converter

Method used

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Experimental program
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Effect test

Embodiment 1

[0023] refer to figure 1 and figure 2 , to illustrate an embodiment related to the present invention.

[0024] figure 2 It is a conceptual diagram showing the power converter 3 related to the embodiment of the present invention. In addition, the power converter 3 of this embodiment is different in that a rectification circuit 35 is used instead of the rectification circuit 25 .

[0025] Specifically, the rectification circuit 35 is a full-bridge rectification circuit composed of a diode 251, a diode 252, a MOSFET 353, and a MOSFET 354, and a MOSFET is used as a synchronous rectification element in the lower branch.

[0026] In addition, the MOSFET353 and the MOSFET354 can be regarded as a pair of self-arc-extinguishing elements driven by the gate drive signal S2 and the gate drive signal S3 in opposite directions. In addition, the diode 251 and the diode 252 can be regarded as another pair of non-self-arc-extinguishing components of the full-bridge rectifier circuit.

...

Embodiment 2

[0032] Below, refer to figure 2 and image 3 Various embodiments of the present invention are described.

[0033] image 3 is a conceptual diagram showing a power converter 4 related to another embodiment of the present invention. In addition, compared to the above figure 2 The power converter 3 differs from the power converter 4 mainly in that a rectifier circuit 45 is used instead of the rectifier circuit 35 .

[0034] Specifically, a MOSFET 451 and a MOSFET 452 are used in the upper branch of the rectification circuit 45 .

[0035] The gate drive unit 273 outputs the gate drive signal S2 to the MOSFET 223 and MOSFET 353 whose source electrodes are connected to the low-side line 28 , and the high-side driver 39 . Likewise, gate drive signal S3 is output to MOSFET 224 , MOSFET 354 , and high-side driver 38 .

[0036]The high-side driver 38 and the low-side driver 39 are circuits for driving the gate of the upper branch whose gate driving reference potential (source po...

Embodiment 3

[0039] Below, refer to figure 2 and Figure 4 Still another different embodiment of the present invention will be described.

[0040] Figure 4 It is a conceptual diagram showing a power converter 5 related to still another embodiment of the present invention. In addition, compared to the above figure 2 The power converter 3 and the power converter 5 are mainly different in the structure of the main conversion circuit and the transformer. Specifically, the difference is that the main conversion circuit 52 and the transformer 53 are used instead of the main conversion circuit 22 and the transformer 23 .

[0041] The main circuit 52 is a full-bridge inverter circuit that is installed at the input section of the transformer and outputs rectangular-waveform AC power to the transformer 23 from the power of the DC power supply 1, and is composed of MOSFET521, MOSFET522, MOSFET523, and MOSFET524. In addition, the high-side driver 48 and the high-side driver 49 are gate drive c...

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PUM

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Abstract

A power converter includes a transformer, a full-bridge rectifying circuit which is located on the secondary side of the transformer and has at least a pair of self-arc-suppressing elements which are driven while being inverted, connection means which connects the negative-pole-side connection line on the primary side of the transformer to that on the secondary side of the transformer, and a control circuit which is commonly used to drive circuits on the primary and secondary sides of the transformer. The self-arc-suppressing elements are driven by the control circuit.

Description

technical field [0001] The present invention relates to power converters. Background technique [0002] Figure 5 It is a conceptual diagram of a conventional power converter 6 . The DC power supply 1 is a known and common DC voltage source. The power converter 6 is a known and common full-bridge circuit mainly composed of a capacitor 21 , a main conversion circuit 22 , a transformer 23 , a rectifier circuit 65 , a capacitor 26 , and a control circuit 27 . [0003] Capacitor 21 and capacitor 26 are capacitors for smoothing input and output DC voltages of power converter 6 and are connected between input and output terminals. Main conversion circuit 22 is a primary-side main conversion circuit of power converter 6 composed of MOSFET 223 and MOSFET 224 , receives DC power from DC power supply 1 , and outputs rectangular-waveform AC power to transformer 23 . In addition, the source electrodes of these MOSFETs are connected to the low-side line 68a. [0004] The transformer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/21H02M3/28H02M3/335H02M3/337
CPCY02B70/1475H02M3/33592H02M3/337Y02B70/10H02M3/33573B41F15/423B41F15/44
Inventor 铃井正毅竹原信善
Owner CANON KK