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Switching power supply and its control circuit and control method

A switching circuit and switching power supply technology, which is applied in the direction of electric light source, electroluminescence light source, control/regulation system, etc., can solve the problems such as the adverse influence of the power factor of the switching power supply, the large harmonic distortion rate of the input current harmonic component of the switching power supply, etc.

Active Publication Date: 2011-12-21
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the harmonic component of the input current of the switching power supply is large, the harmonic distortion rate (total harmonic distortion, THD) is high, and the power factor of the switching power supply is adversely affected

Method used

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  • Switching power supply and its control circuit and control method
  • Switching power supply and its control circuit and control method
  • Switching power supply and its control circuit and control method

Examples

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Embodiment Construction

[0026] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0027] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in...

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Abstract

The invention discloses a switch power supply and a controlling circuit and a controlling method thereof. Through regulating a first multiplying input signal, waveform-following input voltage of an average current is inputted by the switch power supply, so that a harmonic component of an input electric current of the switch power supply is reduced, the THD (Total Harmonic Distortion) is lowered and then the power factor of the switch power supply is increased.

Description

technical field [0001] Embodiments of the present invention relate to a switching power supply, in particular, to a switching power supply and its control circuit and control method. Background technique [0002] Today, switching power supplies are widely used to power electronic devices. Generally, a switching power supply obtains an AC voltage from the power grid, converts the AC voltage into an uncontrolled DC voltage through a rectifier bridge, and then converts the uncontrolled DC voltage into a required signal through a switching circuit to drive a load. [0003] However, with the widespread application of switching power supplies, more and more harmonic currents are injected into the grid. The generation of high-order harmonics increases the harmonic loss of electric energy, reduces the power factor of the system, and causes great harm to the power grid. It not only affects the quality of the power grid, but also has a great impact on the reliability of the power gr...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M1/12H02M1/42H02M3/335H05B44/00
CPCH05B33/0815Y02B70/126H02M1/425H02M3/335H05B45/382H05B45/355Y02B70/10H05B45/3725H05B45/375H05B45/385
Inventor 赵启明熊飞谢建宇江雪梁毅珉
Owner CHENGDU MONOLITHIC POWER SYST
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