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Mass flux control device

A technology of mass flow control and DC power supply, applied in flow control, non-electric variable control, control/regulation system, etc., can solve problems such as poor anti-interference ability, and achieve the effect of enhancing anti-interference ability

Inactive Publication Date: 2009-06-03
BEIJING SEVENSTAR ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are at least the following disadvantages in the above-mentioned prior art: poor anti-interference ability

Method used

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Embodiment Construction

[0013] A preferred embodiment of the mass flow control device of the present invention includes a power supply and a display module, and the power supply and display module include a power supply circuit.

[0014] like figure 1 shown. The power circuit includes an anti-interference capacitor C12, and the anti-interference capacitor C12 is connected between the live line L and the neutral line N of the AC input end of the power circuit.

[0015] The anti-interference capacitor C12 is a metallized polypropylene film capacitor. Metallized capacitors are made by depositing a very thin metal film on the capacitor by vacuum evaporation. Its main feature is that it has a self-healing effect. When the capacitor breaks down due to dielectric short circuit, an arc current will be generated immediately at the breakdown point, and the current density is concentrated in the center of the breakdown point. The heat generated by this current is enough to volatilize the metal coating near ...

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Abstract

The invention discloses a mass flux control device comprising a power supply and display module which comprises a power supply circuit and a voltage / current converting circuit. An anti-interference capacitor is bridged between a live wire and a null wire of an AC input terminal of the power supply circuit. The anti-interference capacitor is a metalized polypropylene film capacitor. The AC input terminal of the power supply circuit is also connected with an EMI filter. A DC output terminal (i.e. a power supply input terminal of a control module) of the voltage / current converting circuit is provided with an EMI sheet-shaped filter and a ceramic disc capacitor. The aniti-interference capacity of the mass flux control device can be effectively reinforced.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to a mass flow control device. Background technique [0002] The mass flow control device is widely used in gas mass flow measurement and control. The power supply and display module in the device mainly provide working power, operation control and flow display for the mass flow controller (ie, the control module). The power supply and display module mainly Including power board, voltage / current conversion board, etc. [0003] The mass flow control device in the prior art has high requirements on anti-interference ability. Among them, the anti-interference design of the power supply and display module is mainly realized by solving the conduction interference and radiation interference, that is, preventing the sudden change of the external AC power supply, impact and interference caused by nearby radio frequency sources. [0004] The above prior art has at least the following disadvantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M1/14G05D7/00H01G4/33
Inventor 陈远谋
Owner BEIJING SEVENSTAR ELECTRONICS CO LTD
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