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Bootstrap driving circuit

A bootstrap drive circuit and circuit technology, applied in the field of electricity, can solve the problems of increasing circuit complexity and cost, and achieve the effects of wide power supply adaptability, simple and reliable circuit, and improved system practicability

Active Publication Date: 2016-03-30
CHINA AEROSPACE TIMES ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] A. Adding an isolated power supply system increases the circuit complexity and cost;

Method used

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Embodiment Construction

[0038] Specific embodiments of the present invention will be described in detail below in conjunction with specific drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as isolated, and they can be combined with each other to achieve better technical effects. In the drawings of the following embodiments, the same reference numerals appearing in each drawing represent the same features or components, which can be applied in different embodiments.

[0039] Such as Figure 4 , Figure 5As shown, a bootstrap drive circuit according to an embodiment of the present invention includes an input filter and protection circuit 1, a PWM signal generation circuit 2, an energy transfer circuit 3, a bootstrap voltage feedback circuit 4, and a bootstrap voltage conversion and energy storage circuit 5;

[0040] The input filter and protection circuit 1 includes a capacitor, an inductance f...

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Abstract

The invention relates to the electricity field and discloses a bootstrap driving circuit. The circuit comprises an input filtering and protection circuit, a PWM signal generation circuit, an energy transmission circuit, a bootstrap voltage feedback circuit and a bootstrap voltage conversion and energy storage circuit. The input filtering and protection circuit realizes power supply ripple wave suppression, and overvoltage and undervoltage protection. The PWM signal generation circuit collects bootstrap output voltages, dynamically adjusts PWM signal oscillation and a duty ratio and adjusts switch open and close time. The energy transmission circuit generates an alternating current signal and transmits power supply input energy into the bootstrap driving circuit. The bootstrap voltage feedback circuit feeds back a bootstrap voltage signal level to the PWM signal generation circuit. The bootstrap voltage conversion and energy storage circuit carries out shaping conversion on an energy signal so as to realize power output of the bootstrap driving circuit. The circuit has advantages that a power supply application range is wide; the structure is easy to realized; a driving capability is high; a voltage-resistant value and reliability are high too; and the circuit is suitable for a large power and high efficiency switch application occasion in which a voltage is higher than a power supply input voltage.

Description

technical field [0001] The invention relates to the field of electricity, in particular to a bootstrap driving circuit. Background technique [0002] With the development of microelectronics technology, N-channel MOSFET and IGBT show more and more obvious advantages compared with triode and P-channel MOSFET in high-frequency, high-power and high-efficiency switching applications. According to its application characteristics, it is necessary to increase the high-voltage signal at the gate relative to the source to achieve effective conduction control. After the power transistor on the high-voltage side is turned on, its source is generally connected to the positive pole of the power supply, so the gate needs a fixed differential voltage drive control signal that fluctuates with the power supply voltage. In most switching applications, high-speed switching control is usually required, so a strong drive current is required in terms of power consumption, speed and efficiency. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/687
CPCH03K17/687H03K2217/0054H03K2217/0081
Inventor 卜春光郭庆王威刘壮华李莹莹徐发洋刘伟刘套
Owner CHINA AEROSPACE TIMES ELECTRONICS CORP
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