Switching power supply and control circuit thereof

A switching power supply, control circuit technology, applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve the problem of high total harmonic distortion of switching power supply, achieve strong versatility, reduce total harmonic distortion, The effect of simplifying the structure

Active Publication Date: 2014-07-09
SHANGHAI LUMIXESS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The present invention solves the problem of high total harmonic distortion of switching power supply

Method used

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  • Switching power supply and control circuit thereof
  • Switching power supply and control circuit thereof
  • Switching power supply and control circuit thereof

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Embodiment Construction

[0046] The high-order harmonics generated by the switching power supply will generate conduction interference and radiation interference along the transmission line of the power grid, thereby polluting the power supply system and affecting the normal operation of other electrical equipment on the road. Therefore, whether from the perspective of protecting the safe operation of the power grid or the normal operation of electrical equipment, reducing the pollution of harmonics to the power grid and suppressing electromagnetic interference has become a common concern in the industry. The reason for the high-order harmonics generated by the switching power supply is mainly the waveform distortion of the AC input current caused by the capacitive filter bridge rectifier circuit commonly used in the switching power supply.

[0047] figure 2 Although the switching power supply shown has added a valley filling circuit 20, its total harmonic distortion still cannot meet the requirement...

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Abstract

The invention discloses a switching power supply and a control circuit of the switching power supply. The control circuit of the switching power supply comprises a peak current detection end, a feedback end, a driving end, a first voltage comparator and a pulse width modulation unit. The control circuit of the switching power supply further comprises a control end and a reference voltage adjusting unit, wherein the control end is suitable for receiving control voltage, the reference voltage adjusting unit is suitable for generating a peak value comparison reference voltage according to control voltage, and when the value of the control voltage is equal to zero V, or the value is larger than a first voltage value, the value of the peak value comparison reference voltage is a second voltage value. When the value of the control voltage is larger than zero V and smaller than or equal to the first voltage value, the value of the peak value comparison reference voltage is equal to the sum of a third voltage value and the value of the control voltagea, and the sum of the third voltage value and the first voltage value is equal to the second voltage value. According to the switching power supply and the control circuit of the switching power supply, the total harmonic distortion of the switching power supply is reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a switching power supply and a control circuit thereof. Background technique [0002] A switching power supply is a power supply that uses modern power electronics technology to control the time ratio of switching transistors on and off to maintain a stable output. With the development and innovation of power electronics technology, switching power supply technology is also constantly innovating. At present, switching power supply is widely used in almost all electronic devices due to its small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today's electronic information industry. DC switching power supply can be divided into two categories according to whether there is electrical isolation between input and output: isolated switching power supply and non-isolated switching power supply. [0003] figure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M3/155H02M1/12
CPCH02M1/4266Y02B70/10
Inventor 陈忠任雪刚
Owner SHANGHAI LUMIXESS TECH
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