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An isolation driver and high frequency switching power supply

A driver and drive circuit technology, which is applied in the direction of instruments, electrical components, and adjustment of electrical variables, etc., can solve the problems of damaged power switch tubes, reduced circuit reliability, and increased turn-off loss of high-frequency switching power supplies, so as to reduce the switching The effect of cutting loss, improving reliability, and high reliability

Active Publication Date: 2020-02-07
FOSHAN BAYKEE NEW ENERGY TECH INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The power switching tube in the high-frequency switching power supply is restricted by semiconductor technology and internal technology, and the Miller capacitance will not be small, which will affect the drive circuit of the power switching tube, which will increase the turn-off loss of the high-frequency switching power supply. Even the power switch tube is damaged due to misconduct, and the reliability of the circuit is reduced.

Method used

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  • An isolation driver and high frequency switching power supply
  • An isolation driver and high frequency switching power supply

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] The invention provides an isolation driver. In one embodiment, as figure 1 As shown, the isolated driver consists of:

[0033] The power amplifying circuit module 100 is used to output the input driving signal to the isolation coupling transformer 200 after processing;

[0034] The isolation coupling transformer 200 is used to isolate and couple the amplified drive signal and then output it to the upper switch tube drive circuit module 300 and the lower sw...

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Abstract

The invention discloses an isolation driver and a high frequency switching power supply. The isolation driver comprises a power amplification circuit module, an isolation coupling transformer, an upper switch tube drive circuit module and a lower switch tube drive circuit module. The upper switch tube drive circuit module and the lower switch tube drive circuit module respectively comprise a negative voltage auxiliary power sub module and a Miller clamp circuit sub module, wherein the negative voltage auxiliary power sub module is used for providing an off-drive auxiliary power supply for theMiller clamp circuit sub module, and the Miller clamp circuit sub module is used for clamping a driving signal output to a switch tube gate to the negative voltage when the isolated coupled driving signal voltage is not positive. Miller clamp circuits are adopted to clamp the driving signal of the negative voltage to reduce the effect of a Miller capacity on the drive, reduce the off consumption and improve the working reliability.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of semiconductor devices, in particular to an isolated driver and a high-frequency switching power supply. Background technique [0002] High-frequency switching power supply (also known as switching rectifier) ​​is a high-frequency switching power supply through MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, metal-oxide-semiconductor field-effect transistor) or IGBT (Insulated GateBipolar Transistor, insulated gate bipolar transistor) For the working power supply, the switching frequency is generally controlled within the range of 50-100kHz to achieve high efficiency and miniaturization. The high-frequency switching power supply has gradually replaced the linear power supply due to its advantages of high efficiency and small size. [0003] The gate of the power switching tube (MOSFET or IGBT) of the high-frequency switching power supply needs to be driven by a driving circ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/088H02M3/335
CPCH02M1/088H02M3/33523H02M3/3353
Inventor 潘世高罗世明
Owner FOSHAN BAYKEE NEW ENERGY TECH INC
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