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Circuit for realizing magnetic isolation feedback and secondary-side independent power supply

A technology of independent power supply and feedback circuit, applied in electrical components, regulating electrical variables, output power conversion devices, etc. Value, simple circuit, small footprint effect

Pending Publication Date: 2019-09-10
SHENZHEN ZHENHUA MICROELECTRONICS +1
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AI Technical Summary

Problems solved by technology

The optocoupler feedback needs to use the linear working area of ​​the optocoupler for isolated feedback, and the transmission ratio of the online linear working area of ​​the optocoupler is easy to change with the change of temperature and time, and the anti-radiation ability is poor, which will affect the accuracy of the feedback and stability, so the reliability is poor, and it is difficult to use for a long time in harsh environments such as aerospace and underground

Method used

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  • Circuit for realizing magnetic isolation feedback and secondary-side independent power supply

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Embodiment Construction

[0014] In order to describe the technical solution of the present invention more clearly and completely, the present invention will be further described below in conjunction with the accompanying drawings.

[0015] Please refer to figure 1 , the present invention proposes a circuit for realizing magnetic isolation feedback and secondary side independent power supply, including a fixed duty ratio generation circuit, a secondary side independent power supply circuit, a magnetic isolation feedback circuit, and an error amplifier circuit. The fixed duty ratio generation circuit generates The driving signal with a fixed duty ratio drives the MOS transistor Q3, and one end of the MOS transistor Q3 is connected to the winding Np of the transformer T1, and the secondary independent power supply circuit is connected to the winding Ns of the transformer T1, and one end of the winding Np of the transformer T1 is also connected to the voltage input terminal PVCC is connected, when the MOS...

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Abstract

The invention provides a circuit for realizing magnetic isolation feedback and secondary-side independent power supply, which can realize both magnetic isolation feedback and secondary-side independent power supply. Magnetic isolation feedback and secondary-side independent power supply can be realized with only one magnetic ring, and the effect of killing two birds with one stone is achieved. Thecircuit is very simple and occupies less space. Therefore, the circuit of the invention has good practical value.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a circuit for realizing magnetic isolation feedback and secondary side independent power supply. Background technique [0002] At present, there are two isolation feedback methods for switching power supplies: optocoupler isolation feedback and magnetic isolation feedback. The optocoupler feedback needs to use the linear working area of ​​the optocoupler for isolated feedback, and the transmission ratio of the online linear working area of ​​the optocoupler is easy to change with the change of temperature and time, and the anti-radiation ability is poor, which will affect the accuracy of the feedback and stability, so the reliability is poor, and it is difficult to use it for a long time in harsh environments such as aerospace and underground. Since magnetic isolation feedback is not affected by temperature and is not sensitive to radiation, it is more suitable for magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523
Inventor 陈海荣卞震霆钟成黄晓伟张天会
Owner SHENZHEN ZHENHUA MICROELECTRONICS
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