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Switching power supply

A switching power supply and power management technology, applied in electrical components, emergency protection circuit devices, output power conversion devices, etc., can solve problems such as damage to electrical equipment, low input voltage, and insufficient output power of switching power supplies, and achieve reliable operation The effect of high performance and wide input voltage range

Active Publication Date: 2015-02-11
NINGBO SANXING INTELLIGENT ELECTRIC
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AI Technical Summary

Problems solved by technology

Although the voltage input range of the switching power supply is wide, in some remote mountainous areas and near industrial factories, when the electrical load is too large, the input voltage will still be too low, that is, the input voltage is lower than the voltage input range of the switching power supply, which will lead to the failure of the switching power supply. Insufficient output power and damage to electrical equipment

Method used

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  • Switching power supply
  • Switching power supply

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 1 , figure 2 As shown, a switching power supply of the present invention includes a rectifying and filtering circuit, a switching power supply controller and a high-frequency transformer. The switching power supply controller consists of a quasi-resonant controller HFC0100 (not shown in the figure) and its peripheral circuits (not shown in the figure) output) composition; the output end of the rectification filter circuit is connected with the input end of the switching power supply controller, the output end of the switching power supply controller is connected with the input end of the high-frequency transformer, and the feedback end of the high-frequency transformer is connected with the switch Input connection of the power controller.

[0021] The switching power supply also includes a low-voltage protection circuit...

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Abstract

The invention discloses a switching power supply which comprises a rectification filter circuit, a switching power supply controller and a high-frequency transformer. An output end of the rectification filter circuit is connected with an input end of the switching power supply controller. An output end of the switching power supply controller is connected with an input end of the high-frequency transformer. A feedback end of the high-frequency transformer is connected with the input end of the switching power supply controller. The switching power supply further comprises a low-voltage protection circuit capable of cutting off power output when input voltage is too low. An input voltage detection end of the low-voltage protection circuit is connected with the output end of the rectification filter circuit. A feedback end of the low-voltage protection circuit is connected with the high-frequency transformer. An on-off control end of the low-voltage protection circuit is connected with the switching power supply controller. The switching power supply can cut off power output when the input voltage is lower than a working range.

Description

technical field [0001] The invention relates to a switching power supply. Background technique [0002] With the characteristics of small size, light weight, wide input range and high efficiency, switching power supply has been widely used in communication, home appliances, industrial instruments and other fields. Although the voltage input range of the switching power supply is wide, in some remote mountainous areas and near industrial factories, when the electrical load is too large, the input voltage will still be too low, that is, the input voltage is lower than the voltage input range of the switching power supply, which will lead to the failure of the switching power supply. Insufficient output power may damage electrical equipment. Therefore, based on the above reasons, there is an urgent need for a low-voltage protection circuit to ensure that the power output can be cut off when the input voltage is lower than the working range, so as to solve the above problems. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32H02H7/10
Inventor 徐海江高松平刘校峰郭飞
Owner NINGBO SANXING INTELLIGENT ELECTRIC
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