Double tube driving circuit and control method thereof
A technology of drive circuit and output circuit, which is applied in the field of dual-tube drive circuit and its control, can solve problems affecting product life, breakdown, high voltage spikes, etc., and achieve the effect of avoiding spikes and burning out
Active Publication Date: 2019-04-05
上海沪航卫星科技有限公司
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- Abstract
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- Application Information
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Problems solved by technology
However, if figure 1 As shown, if two semiconductor switches are turned on or off at the same time, excessive voltage spikes will be generated, which will cause damage to the semiconductor device, as well as damage to the output Schottky or fast recovery diode, seriously affecting the service life of the product, and may even cause breakdown
Method used
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Embodiment 2
[0063] The difference between the second embodiment and the first embodiment is that, please refer to image 3 In the second embodiment, no playback circuit is connected between the first resistor and the first capacitor, and between the second resistor and the second capacitor. That is, there are no first diode, transistor Q3, second diode, transistor Q4, and resistors R3 and R4. Other electrical components and circuit connections are the same, and will not be repeated here.
[0064] Such as image 3 As shown, the circuit of this embodiment 2 can be understood as follows: input the coils 1 to 2 of the driving transformer T1 to isolate the DC component, and couple the received pulse width modulation signal through the magnetic core of the driving transformer T1. The same pulse width modulation signal is obtained from the 5 coils and the 4 to 3 coils of T1. The working process of the driving signal circuit is as follows: the pulse width modulation signal obtained at the 6 pin...
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The present invention provides a double tube driving circuit and a control method thereof. A first resistor and a first capacitor are arranged between an upper semiconductor tube and an input transformer; a second resistor and a second capacitor are arranged between a lower semiconductor tube and the input transformer; and the product of the first resistance and the first capacitance is differentfrom the product of the second resistance and the second capacitance, so that the conduction of the upper semiconductor tube can be earlier or later than conduction of the lower semiconductor tube, thereby reducing the problem that the voltage spike in the existing circuit is too high and the semiconductor component is consequently damaged. In addition, in the case where the rectifying filtering is used in the output circuit and the conduction of the upper semiconductor tube is earlier or later than the conduction of the lower semiconductor tube, no peak will occur in an output transformer, and an output diode is prevented from being burned out.
Description
technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a dual-tube drive circuit and a control method thereof. Background technique [0002] In the existing driving circuit of the switching power tube, two semiconductor switching tubes are usually turned on or off at the same time to control the opening and closing of the circuit. However, if figure 1 As shown, if two semiconductor switches are turned on or off at the same time, excessive voltage spikes will be generated, which will cause damage to the semiconductor device, as well as damage to the output Schottky or fast recovery diode, seriously affecting the service life of the product, and may even cause breakdown . Contents of the invention [0003] In order to overcome the above problems, the present invention aims to provide a delay on-off dual-tube drive circuit and its control method. By adjusting the size of the upper or lower tube drive resistance and ...
Claims
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Login to View More IPC IPC(8): H02M1/38
CPCH02M1/38
Inventor 不公告发明人
Owner 上海沪航卫星科技有限公司