Power tube control system and drive circuit for driving external power tube
A technology for driving circuits and power tubes, which is applied in the direction of output power conversion devices, electrical components, etc., to achieve the effect of improving EMI performance
Active Publication Date: 2017-12-05
无锡先瞳半导体科技有限公司
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Problems solved by technology
The disadvantage of this driving method is that the internal reference voltages VH and VL need to be designed according to the threshold voltage Vth of the power transistor M1
[0007] It can be seen that there is still a lot of room for improvement in the drive technology of the existing external power tube
Method used
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[0026] The present invention provides a power tube control system and a drive circuit for driving an external power tube. In order to make the purpose, technical solution and effect of the present invention clearer and clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0027]The drive circuit for driving an external power tube provided by the present invention controls the opening and closing of the external power tube by an external PWM control signal, and when the external PWM control signal is at a high level, the external power tube is turned on (i.e. The power tube is turned on), and when the external PWM control signal is at a low level, the external power tube is turned off (that is, the power tube is cut off). Since the EMI performance in...
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The invention discloses a power tube control system and a drive circuit for driving an external power tube. When the external PWM control signal is at a high level, the slope inflection point detection unit detects the slope change of the gate voltage of the external power tube. When the slope of the voltage change is before the inflection point A, the control unit closes the first switch tube, and the grid of the external power tube is charged by the first switch tube and the current source. When the change slope of the grid voltage is between the inflection point A and the inflection point B In between, the control unit turns off the first switch tube, so that the first switch tube stops charging the grid of the external power tube. When the change slope of the grid voltage is after the inflection point B, the control unit makes the first switch tube Close, charge the gate of the external power tube again, so that the slope inflection point detection unit detects the obvious change point of the slope of the gate voltage of the external power tube, and realizes the control of the slope of the drain current when the external power tube is turned on. The universality of different manufacturers and different types of power tubes is achieved.
Description
technical field [0001] The invention relates to power tube drive technology, in particular to a power tube control system and a drive circuit for driving an external power tube. Background technique [0002] With the gradual maturity of the development of switching power supply technology, EMI (Electro magnetic Interference, electromagnetic interference) performance has become an inevitable and most difficult problem to solve in the power system. [0003] The EMI performance of the power supply is not only directly related to the PCB Layout (PCB layout) and the transformer structure, but more importantly, it is related to the opening of the power tube. The key to affecting the EMI performance of the switching power supply is the slope (di / dt) of the drain-source current change during the turn-on phase of the power tube, and these are closely related to the driving technology of the power tube. [0004] The existing power tube drive technology generally adopts the totem pole...
Claims
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IPC IPC(8): H02M1/36H02M1/44
Inventor 宋利军白文利
Owner 无锡先瞳半导体科技有限公司