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Rectifier circuit, power supply device, and rectifier circuit drive method

A rectifier circuit and driving method technology, applied in high-efficiency power electronic conversion, output power conversion device, DC power input conversion to DC power output, etc., to achieve the effect of reducing transient current

Pending Publication Date: 2021-01-26
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reverse recovery current generates losses (more specifically, switching losses) in the rectifier circuit (power supply circuit)

Method used

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  • Rectifier circuit, power supply device, and rectifier circuit drive method
  • Rectifier circuit, power supply device, and rectifier circuit drive method
  • Rectifier circuit, power supply device, and rectifier circuit drive method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach 〕

[0029] Hereinafter, the rectifier circuit 1 of the first embodiment will be described. For convenience of description, members having the same functions as those described in the first embodiment are denoted by the same reference numerals in the subsequent embodiments, and description thereof will not be repeated.

[0030] (One purpose of rectification circuit 1)

[0031] As described above, a reverse recovery current (transient current) flows through a rectifying element having a PN junction. In recent years, the development of rectifier elements (compound semiconductor elements) that do not have a PN junction has been actively developed. Examples of such a rectifying element include SiC-SBD (Schottky Barrier Diode, Schottky barrier diode), GaN-HEMT (High Electron Mobility Transistor, high electron mobility transistor), and the like. In this rectifying element, charge accumulation in the PN junction does not occur. Therefore, in this rectifying element, no reverse recovery...

no. 2 approach 〕

[0189] Figure 10 It is a diagram showing the circuit configuration of the power supply circuit 20 of the second embodiment. The rectification circuit of the second embodiment is referred to as a rectification circuit 2 . In the rectification circuit 2, the power supply TP1 of the rectification circuit 1 is replaced with a power supply FP1. That is, in the power supply circuit 20 , the input power supply (power supply FP1 ) of the step-up chopper unit is also used as the power supply of the rectification circuit 2 . According to this configuration, the total number of power supplies of the power supply circuit 20 can be reduced, which is advantageous in terms of cost.

[0190] In addition, in the rectification circuit 2 , switching elements TT2 , TT3 , and TT4 are provided instead of the switching element TT1 of the rectification circuit 1 . The transformer of the rectification circuit 2 is called a transformer TR2. The primary winding and the secondary winding of the tran...

no. 3 approach 〕

[0206] Figure 11 It is a diagram showing the circuit configuration of the power supply circuit 30 of the third embodiment. The rectification circuit of the third embodiment is referred to as a rectification circuit 3 . In the rectification circuit 3, the power supply TP1 of the rectification circuit 1 is replaced with a capacitor RV1. That is, in the power supply circuit 30 , the smoothing capacitor (capacitor RV1 ) of the step-up chopper unit functions as a power supply for the rectification circuit 3 . According to this configuration, since the total number of power supplies of the power supply circuit 30 can be reduced, it is advantageous in terms of cost.

[0207] In addition, in the rectification circuit 3 , switching elements TT5 , TT6 , and TT7 are provided instead of the switching element TT1 of the rectification circuit 1 . The transformer of the rectification circuit 3 is called a transformer TR3. The primary winding and the secondary winding of the transformer ...

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PUM

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Abstract

The present invention effectively reduces a transient current in a rectifier circuit. A rectifier circuit (1) has a first rectifier element (FR1) provided between a first terminal (FT1) and a second terminal (ST1). In the rectifier circuit (1), if a switch element (TT1) is on, a primary winding current flows from a power supply (TP1) to a primary winding (PW1) of a transformer (TR1). If the switchelement (TT1) is off, a second rectifier element current flows from a secondary winding (SW1) of the transformer (TR1) to a second rectifier element (SR1). During a period in which the second rectifier element current is flowing, reverse voltage is applied between the first terminal (FT1) and the second terminal (ST1).

Description

technical field [0001] The following disclosure relates to rectification circuits. Background technique [0002] A rectification element such as MOSFET (Metal Oxide Semiconductor Field Effect Transistor) or FRD (First Recovery Diode, fast recovery diode) is used in the rectification circuit provided in the power supply circuit. Such a rectifying element includes a diode having a PN junction (PN junction). [0003] When a voltage is applied upward to the rectifying element, a current flows through the PN junction, and charges are accumulated in the PN junction. Thereafter, when a voltage is applied to the rectifying element in the reverse direction, charges accumulated in the PN junction flow through the rectifying element as a transient current. After the transient current flow ends, the current flow through the rectifying element stops. This transient current is also called reverse recovery current. The reverse recovery current generates loss (more specifically, switchi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/335H02M1/007H02M3/158H02M3/33592H02M1/0054H02M1/4208Y02B70/10
Inventor 盐见竹史
Owner SHARP KK
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