Grid driving circuit and method
A technology of gate drive circuit and main drive, which is applied in the direction of electrical components, output power conversion devices, etc., and can solve the problems of difficult selection of drive capacity
Active Publication Date: 2017-08-08
CRM ICBG (WUXI) CO LTD
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Problems solved by technology
[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a gate drive circuit and method for solving the problem of difficulty in selecting "appropriate drive capability" in the prior art
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[0044] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0045] see Figure 2 ~ Figure 3 . It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbi...
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The invention provides a grid driving circuit and method. The circuit comprises a dead zone time control module, a first inverter, a delay module, a second inverter, a clamping module and driving tubes, wherein the dead zone time control module generates first and second control signals which are not overlapped, the first inverter obtains an inverted signal of the second control signal, the delay module generates third and fourth control signals, the second inverter obtains an inverted signal of the third control signal, and the clamping module clamps the grid voltage of a pre-driving tube. In the process that a power switch tube is connected, the grid voltage of the pre-driving tube is clamped, so that time of a Miller plateau is independent from the power voltage. A pulse synchronized within independent connection time of the pre-driving tube is introduced, the driving voltage of the pre-driving tube is clamped in a fixed potential within the time, so that time of the Miller plateau, dV / dt in the drain end of the power switch tube and EMI amplitude do not change with the power voltage, and a proper driving capability is easy to select.
Description
technical field [0001] The invention relates to the field of AC-to-DC control, in particular to a gate drive circuit and method. Background technique [0002] Power MOSFETs are commonly used switching devices in alternating current to direct current (AC-DC) converters. The driving circuit with excellent performance can make a great contribution to the reliable switching control of the converter, high system efficiency and low electromagnetic interference. A key point for high converter efficiency is the low switching losses of the power MOSFETs. However, low switching loss and low electromagnetic interference (EMI) are mutually restricted in principle. Generally speaking, the stronger the driving capability and the faster the switching speed, the lower the corresponding switching loss. Faster switching speed means higher dV / dt at the drain of the power MOSFET, and higher dV / dt leads to stronger EMI radiated energy. If the driving capability is weakened, EMI can be reduce...
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IPC IPC(8): H02M1/08
CPCH02M1/08
Inventor 闾建晶盛欢
Owner CRM ICBG (WUXI) CO LTD