A dc-dc conversion circuit output voltage negative overshoot suppression device and method
A technology for converting circuit and output voltage, which is applied in the field of negative overshoot suppression device for output voltage of DC-DC conversion circuit, which can solve problems that are difficult to eliminate, and achieve the effects of reducing bad situations, improving reliability and improving performance
Active Publication Date: 2017-08-29
GUANGDONG VTRON TECH CO LTD
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- Description
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- Application Information
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Problems solved by technology
Since the stray inductance and stray capacitance at the output end of the power circuit are parasitic circuit parameters, it is difficult to completely eliminate them.
Method used
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[0014] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;
[0015] In order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;
[0016] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.
[0017] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0018] Such as figure 2 , 3 , a DC-DC conversion circuit output voltage negative overshoot suppression device, used to suppress the DC-DC conversion circuit output voltage negative overshoot, the output voltage negative overshoot suppression device is connected to the output of the DC-DC conversion circuit, the The output voltage negative overshoot suppression device includes a capacitor EC...
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The invention discloses a device and method for suppressing the negative overshoot of the output voltage of a DC-DC conversion circuit, which is used to suppress the negative overshoot of the voltage output by the DC-DC conversion circuit, and the negative overshoot suppression device for the output voltage is connected to the DC-DC conversion circuit The output terminal of the output voltage negative overshoot suppression device includes a capacitor EC45, the capacitor EC45 is connected in parallel to the output terminal of the DC-DC conversion circuit, and the capacitance value of the capacitor EC45 is the number of the output capacitance value of the DC-DC conversion circuit times. The invention eliminates the resonance source formed by stray inductance and capacitance, and completely eliminates the negative overshoot voltage. The suppression device of the present invention uses a large capacitor several times larger than the output capacitance of the DC-DC conversion circuit (DC module power supply) to be connected in parallel to the output end of the DC module power supply, so that after the DC module power supply is input and powered off, those miscellaneous The scattered inductance cannot resonate with the capacitor, and the resonance is completely eliminated. Without the resonance, the output voltage will be reduced normally, and the purpose of eliminating the negative overshoot of the output voltage of the DC module power supply is achieved.
Description
technical field [0001] The present invention relates to the field of power supplies, and more specifically, to a device and method for suppressing negative overshoot of output voltage of a DC-DC conversion circuit. Background technique [0002] In the use of DC-to-DC module power supplies, some DC module power supplies have the problem that the output voltage drops to zero volts and then continues to drop after the input voltage is cut off, and becomes a negative voltage after crossing the zero potential, which makes the negative overshoot of the output voltage serious. This negative overshoot voltage exceeds the range required for use, because the negative voltage of the power supply voltage of many chips is very small, and the negative voltage limit of most chips is a few tenths of a volt (-0.1V to -0.3V). Therefore, the output Poor handling of voltage negative overshoot will cause harm to the chip at the load end, reduce the safety of the chip at the load end, and bring h...
Claims
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IPC IPC(8): H02M1/14
CPCH02M1/14H02M1/32
Inventor 帅孟奇
Owner GUANGDONG VTRON TECH CO LTD