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Method for eliminating filter inductor noise caused by chopper

A technology of filter inductors and choppers, which is applied in the field of power supply processing and adjustment, and can solve problems such as destroying comfort

Inactive Publication Date: 2015-05-13
陈幼珠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defect that the existing chopper regulator causes electrical filter inductance noise and damages the comfort, the present invention proposes a method for eliminating the filter inductance noise caused by the chopper, and its technical scheme is as follows:

Method used

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  • Method for eliminating filter inductor noise caused by chopper
  • Method for eliminating filter inductor noise caused by chopper
  • Method for eliminating filter inductor noise caused by chopper

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Embodiment 1

[0025] like figure 1 and figure 2 Shown is a schematic diagram of Embodiment 1 of the present invention. figure 1 It is a schematic diagram of the structure of the electrical appliance where it is located. figure 2 is the structure of the splitter 20 .

[0026] This embodiment is applied to electrical appliances with a power frequency series filter inductor L; C is a filter capacitor, and its two ends are connected to the power signal input obtained by chopping; the rear stage of the filter inductor L is a rectifier bridge 10, and the rear stage of the rectifier bridge Level is load 30. A shunt device 20 is connected in parallel at both ends of the filter inductance L; the output terminals 21 and 22 of the shunt device 20 are mutually conducted when the operating voltage of the filter inductance L in series reaches or exceeds a preset limit peak value; in the filter inductance L When its operating voltage is lower than the limit peak value, it will resume cut-off.

[00...

Embodiment 2

[0032] like image 3 and Figure 4 Shown is a schematic diagram of Embodiment 2 of the present invention. image 3 is the circuit structure of its electrical appliances, Figure 4 It is the structure of the branching part of the present embodiment.

[0033] In this embodiment, the filter inductor L is located at the rear stage of the rectifier bridge 10 , and besides C, the filter capacitor also has C2 at the rear stage. The shunt component 20 is still connected to both ends of the filter inductor L through the output terminals 21 and 22 . It can be seen that the position of the filter inductor L does not affect the effect of the scheme.

[0034] The shunt device 20 of this solution also works in a passive manner. The difference is that this embodiment adopts the form of a shunt unit, and the voltage regulator tube D3 is used in the shunt unit to drive the three-terminal control device—the thyristor T1 to work, so as to reduce excessive voltage. peak. The regulator tube ...

Embodiment 3

[0036] like Figure 5 As shown, the structure diagram of the flow splitting device 20 in this implementation is smooth. The scheme of this embodiment is the same as Figure 4 The structure of the first embodiment shown, this scheme also uses the form of a shunt unit, and each shunt unit uses a three-terminal control device and a voltage regulator tube. The difference is that the shunt unit of this embodiment is located before the rectifier bridge 10, so it is located in the AC In the loop, it is necessary as Figure 5 The structure of two anti-parallel flow splitters in . The three-terminal control devices of this scheme are transistors T3 and T4, which are controlled by regulator tubes D5 and D6 respectively. This solution cuts the voltage spike to achieve a faster response speed.

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Abstract

The invention discloses a method for eliminating filter inductor noise caused by a chopper. The method is applied to electrical equipment equipped with a power-frequency series filter inductor. The method is characterized in that a shunt device is connected in parallel to the two ends of the filter inductor; the shunt device communicates the two ends of the filter inductor when the working voltage or current of the series filter inductor reaches or exceeds a preset limit peak; and a cut-off state is recovered when the working voltage of the series filter inductor is smaller than the limit peak. By adopting the scheme, over-high peak voltage across the two ends of the filter inductor is directly reduced, obvious peak generated between the output ends is inhibited, and vibration and noise of the filter inductor generated due to voltage peak are greatly reduced.

Description

technical field [0001] The invention relates to a power supply processing and adjustment method, in particular to a method for eliminating noise caused by a chopper on a filter inductance. Background technique [0002] In the application of electrical appliances in home life, it often involves the use of choppers to adjust the power supply parameters of electrical appliances to achieve changes in electrical effects such as speed and light flux to meet different life needs. The principle of the chopper is to cut off the AC current signal in an appropriate time, especially in each current cycle, cut off the same time, so that the output power will finally change. The current chopper mainly uses switching devices to realize the chopping function, and most of the electrical appliances regulated and controlled by the subsequent stage are non-resistive loads. Therefore, the current waveform of the electrical appliances will be zero-crossing at each voltage chopping position. Ther...

Claims

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Application Information

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IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 陈幼珠
Owner 陈幼珠
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