Power supply with impact current suppression and enabling control
A technology of inrush current and suppression circuit, which is applied in the field of power supply, can solve problems such as limited charge and discharge current of energy storage capacitors, weakened inrush current suppression effect, abnormal operation of DC/DC conversion circuit, etc., to improve adaptability and reliability, Effect of reducing heat loss
Inactive Publication Date: 2021-06-08
北京军陶科技有限公司 +1
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Problems solved by technology
However, this method is not suitable for the environment of high temperature, low temperature and frequent switching on and off: at high temperature, the resistance of the NTC thermistor decreases, and the suppression effect of the inrush current is weakened; at low temperature, the resistance of the NTC thermistor increases, and the energy storage capacitor charges The discharge current is limited, which may lead to abnormal operation of the DC / DC conversion circuit; when the machine is switched on and off frequently, the temperature of the NTC thermistor will not drop, the resistance value will decrease, and the impact current suppression effect will be weakened
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[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0038] It should be understood that the step numbers used herein are only for convenience of description, and are not intended to limit the execution order of the steps.
[0039] It should be understood that the terminology used in the description of the present invention is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in this specification and the appended claims, the singular forms "a", "an"...
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The invention discloses a power supply with impact current suppression and enable control. The power supply comprises: an input filter circuit which is used for filtering an AC input voltage Vi and then outputting an AC voltage Va; a rectifying circuit used for rectifying and converting the alternating-current voltage Va and then outputting direct-current voltage Vd; an impact current suppression circuit used for suppressing impact current generated by the direct-current voltage Vd in the power supply and outputting an enable signal EN; a DC / DC conversion circuit is used for carrying out isolation conversion on a DC voltage Vd and outputting a DC voltage Ve under the control of the enable signal EN; and an output filter circuit is used for carrying out filtering and noise reduction on the direct-current voltage Ve and then outputting direct-current voltage Vo. According to the invention, the impact current when the power supply is started can be suppressed, the influence of overcurrent stress on the power supply and a power supply system is avoided, the reliability of equipment is further improved, the enable signal EN of the power supply can be led out, and the enable control of the power supply is realized.
Description
technical field [0001] The invention relates to the technical field of power supplies, in particular to a power supply with inrush current suppression and enabling control. Background technique [0002] In the field of AC / DC power supply technology, the input is AC voltage, such as mains 220V / 50Hz, which needs to be rectified into DC voltage during power conversion, and then converted to DC voltage required by equipment through switching power supply technology isolation, such as 12V, 5V etc. Because the energy storage capacitor is needed between the rectifier circuit and the DC / DC conversion circuit of the switching power supply, if the attached figure 1 As shown, the energy storage capacitor needs to be charged at the initial stage of power-on, which will generate a relatively large inrush current in the input circuit, as shown in the attached figure 2 As shown, the inrush current will cause overcurrent stress to the components in the input circuit and the power supply ...
Claims
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IPC IPC(8): H02M7/04H02M1/34
CPCH02M1/34H02M7/04
Inventor 张士化胡志刚顾校平徐林
Owner 北京军陶科技有限公司