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Non-isolated switching power supply circuit for super wide voltage input

A switching power supply circuit, ultra-wide voltage technology, applied in the output power conversion device, the conversion of DC power input to DC power output, the conversion of AC power input to DC power output, etc. problem, to achieve the effect of improving the input voltage range

Active Publication Date: 2016-05-04
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the power supply IC is damaged due to the high input voltage of the power grid when the existing non-isolated switching power supply is applied.

Method used

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  • Non-isolated switching power supply circuit for super wide voltage input
  • Non-isolated switching power supply circuit for super wide voltage input

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Embodiment

[0018] Such as figure 1 As shown, the non-isolated switching power supply circuit with ultra-wide voltage input includes: rectification and filtering circuit 01, MOS tube voltage divider circuit 02, buck step-down circuit 03 and regulated output circuit 04. The present invention is characterized in that the AC input voltage is passed through the rectification and filtering circuit 01 to obtain the DC bus voltage, and the DC bus voltage flows through the MOS tube voltage divider circuit 02, and the MOS tube voltage divider circuit 02 controls the bus voltage according to changes in the circuit design parameters and the application environment. Voltage division, the buck step-down circuit 03 performs step-down processing on the output of the MOS transistor voltage divider circuit 02, and the voltage-stabilizing output circuit 04 performs secondary voltage stabilization and filtering on the output of the buck step-down circuit 03 to output.

[0019] Such as figure 2 As shown, t...

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Abstract

The invention relates to a switching power supply, and aims at solving a problem of damage to a power supply IC caused by over-high power grid input voltage of the existing non-isolated switching power supply in use. The non-isolated switching power supply circuit for super wide voltage input, provided by the invention, comprises a rectifier and filter circuit, a MOS tube voltage division circuit, a buck step-down circuit and a voltage stabilization output circuit. The non-isolated switching power supply circuit for super wide voltage input has the characteristics that an alternating current input voltage is processed by the rectifier and filter circuit to form a direct current bus voltage, the direct current bus voltage flows through the MOS tube voltage division circuit, the MOS tube voltage division circuit performs voltage division for a bus according to circuit design parameters and variation of application environment, the buck step-down circuit performs step-down treatment for the output of the MOS tube voltage division circuit, and the voltage stabilization output circuit performs secondary voltage stabilization filtering outputting for the output of the output of the buck step-down circuit. The non-isolated switching power supply circuit for super wide voltage input is suitable for a non-isolated switching power supply of which an input voltage is not steady.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a non-isolated switching power supply with ultra-wide voltage input. Background technique [0002] In the commonly used non-isolated AC-DC circuit, the AC input voltage is rectified and filtered by the rectifier bridge and directly supplies power to the BUCK circuit, and the BUCK circuit realizes the step-down output. The existing problem is that the withstand voltage of the commonly used BUCK circuit IC on the market is about 600VDC. However, in some markets where the grid voltage is unstable, such as the Indian market, the grid voltage may reach 450VAC, and the rectified voltage may reach more than 630VDC. If no measures are taken, there may be a risk of damage to the power supply IC. Contents of the invention [0003] The purpose of the present invention is to solve the problem that the power supply IC is damaged due to the high input voltage of the grid when the existing non-iso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M3/155
CPCH02M3/155H02M7/217H02M1/0077
Inventor 赵勇徐明章赵利华
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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