Driving method and circuit of switching tube and power supply system
A technology of driving circuit and driving method, which is applied in the direction of control/regulation system, electrical components, adjusting electric variables, etc., can solve the problems of prolonging the opening driving time, shorten the opening driving time, and prevent the effect of current overshoot
Active Publication Date: 2018-09-21
JOULWATT TECH INC LTD
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Problems solved by technology
[0006] In view of this, the object of the present invention is to provide a driving method, circuit and power supply system of a switch tube with controllable current during the turn-on process and optimize the turn-on driving time, so as to solve the current overshoot problem in the prior art. Technical issues that prolong turn-on drive time
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[0041] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made within the spirit and scope of the present invention.
[0042] In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.
[0043] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in simplified form and use inaccurate scales, which are only used to facilitate and clearly assist the purpose of illustrating the embodiments of t...
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The invention discloses a driving method and circuit for a switching tube and a power system. The turn-on process of the main switching tube can be roughly divided into three phases, the current flowing through the main switching tube is limited by adopting a current limiting module to prevent overshoot, the current limiting module has multiple implementation schemes, a logic control module controls the current limiting module not to work before turn-on, and the control end of the switching tube is turned off; in the turn-on process, the gate source voltage of the switching tube is adjusted via a feedback loop, so that the current of the switching tube quickly reaches set turn-on limiting current and is maintained at the current, till the switching tube is completely turned on. The current of the switching tube in the turn-on process can be effectively controlled, and the turn-on driving time is shortened.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a driving method, a circuit and a power supply system of a switch tube. Background technique [0002] In the power supply system, the conversion of electric energy is realized by controlling the switching on and off of the switch-type power tube (that is, the switch tube), and the control of switching frequency, input and output voltage and current is the key to power conversion. The drive control of the power tube is essential. Such as figure 1 As shown, taking the commonly used step-down (BUCK) circuit in the power system as an example, the logic control circuit U01 samples the output voltage and compares it with its internal reference voltage to generate a PWM signal to control the on and off of the main switch M00 cut off, so that the output voltage of the power system is equal to its internal reference voltage. Since the parasitic capacitance of the gate of the ...
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IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 黄必亮黄丽斌任远程周逊伟
Owner JOULWATT TECH INC LTD