SiC BJT proportion drive circuit based on junction temperature and current feedback, control method thereof

A driving circuit and current feedback technology, applied in the field of SiCBJT proportional driving circuit and its control, can solve the problem of large driving current margin, and achieve the effect of reducing steady-state driving loss, high switching speed, and reducing steady-state driving loss

Inactive Publication Date: 2017-04-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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Problems solved by technology

However, in many applications, such a setting has a large driving current margin, which brings a lot of unnecessary driving losses

Method used

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  • SiC BJT proportion drive circuit based on junction temperature and current feedback, control method thereof
  • SiC BJT proportion drive circuit based on junction temperature and current feedback, control method thereof
  • SiC BJT proportion drive circuit based on junction temperature and current feedback, control method thereof

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Embodiment Construction

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0028] SiC BJT proportional drive circuit based on junction temperature and collector current feedback, including: dynamic fast switching circuit, steady-state low-loss drive circuit and feedback control circuit. One end of the dynamic fast switching circuit is connected to a high-voltage power supply, and the other end is connected to the base of a silicon carbide bipolar transistor. One end of the steady-state low-loss drive circuit is connected to a low-voltage power supply, and the other end is connected to the base of a silicon carbide...

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Abstract

The invention discloses a SiC BJT proportion drive circuit based on junction temperature and current feedback, and a control method thereof; the SiC BJT proportion drive circuit comprises a stable state low-loss drive circuit, a dynamic rapid switch circuit and a feedback control circuit; in the control method, the stable state base electrode drive current is commonly determined by the collector electrode current size and silicon carbide bipolar transistor junction temperature, and the stable state base electrode drive current size can be dynamically changed by real time feedbacks. Compared with an existing proportion drive circuit, the SiC BJT proportion drive circuit combines SiC BJT device characteristics and considers temperature influences on SiC BJT current gains, thus reasonably setting the base electrode drive current allowance, and reducing stable state drive losses.

Description

technical field [0001] The invention relates to a SiC BJT proportional drive circuit based on junction temperature and current feedback and a control method thereof, belonging to the technical field of power electronic control. Background technique [0002] With the rise of silicon carbide power devices, bipolar transistors have regained the attention of developers in the industry. SiCBJT has the advantages of low on-resistance, fast switching speed, high temperature resistance, and easy parallel connection. It is a very promising high-voltage and high-current power device. [0003] However, SiC BJT is a current-mode power device and requires a steady-state current to maintain its on-state. Reducing the driving loss is an important application bottleneck of SiC BJT, and in the driving loss, the loss during steady-state conduction accounts for the largest proportion of the total driving loss. Some scholars have applied 6A SiC BJT power tubes to 2kW boost converters for test...

Claims

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Application Information

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IPC IPC(8): H03K17/042H03K17/56
CPCH03K17/042H03K17/56H03K2217/0036H03K2217/0081
Inventor 刘清秦海鸿聂新余俊月
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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