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Method for constantly outputting current and device thereof

A constant output and output current technology, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, electrical components, etc., can solve the problems of power system output current deviation, deviation, transformer output current non-constant, etc. , to achieve the effect of low controller cost, simple structure and high precision

Active Publication Date: 2010-12-22
SHENZHEN SUNMOON MICROELECTRONICS
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Problems solved by technology

But in the actual mass production process, due to the inductance L of the transformer P Inconsistent, there will be a deviation, and it will lead to a deviation in the output current of the power system
[0022] Therefore, it is necessary to propose an effective technical solution to solve the problem due to the inductance L of the transformer P The problem of non-constant output current due to inconsistency

Method used

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  • Method for constantly outputting current and device thereof
  • Method for constantly outputting current and device thereof
  • Method for constantly outputting current and device thereof

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Embodiment Construction

[0046] If there is no special statement, in the present invention, for the convenience of expression and writing, different technical terms are used for the same technical feature, and there are also different names in this technical field, but their essential meanings or representative or pointed objects are the same, E.g:

[0047] Primary winding, primary inductance, and primary coil all refer to the primary coil of the transformer;

[0048] Auxiliary winding and auxiliary coil refer to the auxiliary coil on the primary side of the transformer;

[0049] Output winding, output coil, secondary winding, secondary coil, secondary coil, secondary winding all refer to the output coil of the transformer;

[0050] Degaussing time refers to the time during which the output winding of the transformer has a non-zero current;

[0051] Primary current, primary peak current, and primary coil current all refer to the current on the primary side of the transformer;

[0052] Constant outp...

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Abstract

The embodiment of the invention provides a method for constantly outputting current, comprising the following steps: an input circuit receives externally input voltage, and a drive controller and a power switch are in operating condition; the controller controls the power switch to ensure that a peak value of input current IP of the power switch is a constant value and a product of a switching frequency f of the power switch and degaussing time Tdemag of a flyback transformer is a constant value, that is, Tdemag*f=c, wherein, c is a constant; and the current input end of the power switch is connected with a primary coil of the flyback transformer, wherein, primary current on the primary coil is IP, an auxiliary winding signal of the flyback transformer is fed back to the input circuit, and output current on a secondary coil is rectified and filtered through an output circuit to obtain constant output current which is provided to load. In the technical scheme provided by the invention,the switching frequency of the power switch can be adjusted by the degaussing time, thus eliminating influence of output current deviation of a power supply system caused by transformer inductance variation, and improving accuracy of the output current.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular, the invention relates to a method and device for constant output current. Background technique [0002] With the improvement of switching power supply efficiency, the reduction of volume and cost, switching power supply is more and more widely used in electronic products. In practical applications, not only the output voltage of the switching power supply needs to be controlled, but also the output current of the switching power supply is often required to be controlled, such as controlling a constant output current to drive LEDs, mobile phone chargers, AC / DC power adapters, and backup power supplies for mobile devices. [0003] At present, in the application of flyback switching power supply (flyback AC-DC converter), there are two common control methods for constant output current. The most common method is to use the secondary side of the transformer, also called the sec...

Claims

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Application Information

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IPC IPC(8): H02M3/335
Inventor 赵春波李照华郭伟峰王乐康尹志刚
Owner SHENZHEN SUNMOON MICROELECTRONICS
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