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Power supply circuit with floating ground control function

A technology of power supply circuit and floating power supply, applied in the field of power supply, can solve the problems of power failure of floating power supply and failure to supply power normally, and achieve the effect of avoiding excessive withstand voltage and improving power failure of floating power supply.

Pending Publication Date: 2021-02-05
SUZHOU KUNYUAN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When there is no load, the power transistor is turned off for a long time, and the floating power supply cannot be powered and loses power
Therefore, the existing power supply circuit has the problem that the floating power supply loses power when it is no-load and cannot supply power normally.

Method used

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  • Power supply circuit with floating ground control function
  • Power supply circuit with floating ground control function
  • Power supply circuit with floating ground control function

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Embodiment Construction

[0034] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that, the specific embodiments described herein are only used to explain the embodiments of the present invention, but are not intended to limit the embodiments of the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the embodiments of the present invention.

[0035] figure 1 A schematic diagram of a circuit structure of a power supply circuit with a floating control function provided by an embodiment of the present invention, refer to figure 1 , the power supply circuit with the floating control function provided by the embodiment of the present invention includes: a power transistor 110, a driving module 120, an inductance L, a voltage detection module 130, a comparison module 140 and an energy dis...

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Abstract

The embodiment of the invention provides a power supply circuit with a floating ground control function. The power supply circuit comprises a power transistor, a driving module, an inductor, a voltagedetection module, a comparison module and an energy discharge module, the grid electrode of the power transistor is electrically connected with the driving module, the first electrode transmits output voltage through an inductor, the second electrode is connected to an input power supply, and the first electrode of the power transistor is connected to the floating ground; the first end of the voltage detection module is connected with a floating power supply, the second end is electrically connected with the floating ground, and the third end is electrically connected with the first input endof the comparison module; threshold voltage is accessed to the second input end of the comparison module, and the output end of the comparison module is electrically connected with the control end ofthe energy discharge module; and the first end of the energy discharge module is connected with an output voltage, and the second end of the energy discharge module is grounded. According to the power supply circuit with the floating ground control function provided by the embodiment of the invention, the problem of power failure of the floating ground power supply when the power supply circuit is no-load can be overcome.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a power supply circuit with a floating control function. Background technique [0002] With the development of electronic technology, electronic products have been used more and more. Among them, as the energy source of electronic products, power management is an important factor to ensure the stable operation of electronic products. [0003] In an existing power supply circuit, one end of the power transistor is connected to a high-voltage power supply, and the other end is connected to an inductor, so that the power transistor has a withstand voltage problem of the gate-source voltage Vgs. In order to solve this problem, a floating power supply can be used to adjust the gate-source voltage Vgs to prevent the gate-source voltage Vgs from exceeding the withstand voltage range. Among them, the floating power supply is powered by a high-voltage power supply. When there is a load in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/32
CPCH02M3/158H02M1/32
Inventor 孙波杨逢春
Owner SUZHOU KUNYUAN MICROELECTRONICS
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