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Bootstrap driving circuit special for frequency converter

A kind of bootstrap drive circuit, drive circuit technology

Inactive Publication Date: 2015-04-08
SHANGHAI QIROD ELECTRIC SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a dedicated bootstrap drive circuit for frequency converters to solve the problem of excessive drive power in the prior art

Method used

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  • Bootstrap driving circuit special for frequency converter

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Embodiment Construction

[0014] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0015] refer to figure 1 As shown, a bootstrap drive circuit dedicated to frequency converters includes an upper arm drive circuit, a lower arm drive circuit, and IGBT1 and IGBT2 connected to the upper arm drive circuit and the lower arm drive circuit respectively;

[0016] The upper arm drive circuit includes resistors R1, R2, R4, capacitors C1, C3, upper arm drive, inductor L1, diodes D1, D3, D4; the resistors R1, R2, and D1 are connected in series with the VCC pin of the upper arm drive; The VCC pin of the upper arm driver is connected in series with the diode D2 and connected to the IGBT1; the VO pin of the upper arm driver is respectively connected to one end of the resistors R3 and R4, and the other end of the resistor R3 is connected in s...

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Abstract

The invention relates to a bootstrap driving circuit special for a frequency converter. The bootstrap driving circuit special for the frequency converter comprises an upper arm driving circuit, a lower arm driving circuit, an IGBT1 (insulated gate bipolar transistor) connected with the upper arm driving circuit, and an IGBT2 connected with the lower arm driving circuit. The upper driving circuit comprises resistors R1, R2 and R3, capacitors C1 and C3, an upper arm driving unit, an inductor L1, and diodes D1, D3 and D4, wherein the resistors R1 and R2 are connected in series with the D1 and connected with the VCC (voltage of circuit) pins of the upper arm driving unit; the VCC pins of the upper arm driving unit are connected in series with the diode D2 and connected with the IGBT1; the VO (voltage output) pins of the upper arm driving unit is connected with one end of the resistor R4, and the other end of the resistor R4 is connected in series with the inductor L1 and connected with the IGBT1; the capacitor C1 is arranged between the VCC pins and the GND (ground) pins of the upper arm driving unit, and the capacitor C3 is arranged between the VO pins and the GND pins of the upper arm driving unit. The bootstrap driving circuit special for the frequency converter has the advantages of being simple in structure and achieving power charging and storage through the capacitors to save power of an independent switch power source.

Description

technical field [0001] The invention relates to the technical field of frequency converters, in particular to a bootstrap drive circuit dedicated to frequency converters. Background technique [0002] Insulated gate bipolar transistors (i.e. IGBTs) have the characteristics of both power field effect transistors (MOSFETs) and power transistors (BJTs), making them widely used in power electronics systems, especially in the frequency conversion technology industry. The key to the use of IGBT is to design a suitable drive circuit. However, the upper and lower bridge IGBTs in the IGBT of the inverter cannot use the same power supply as the driving power supply. It is for this reason that at least 4 independent switching power supplies are required in the inverter. [0003] In order to reduce the number of switching power supplies, the present invention proposes a dedicated bootstrap drive circuit for frequency converters. Contents of the invention [0004] The invention provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088
CPCH02M1/088
Inventor 刘国鹰
Owner SHANGHAI QIROD ELECTRIC SCI & TECH
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