CN1159138A

CN1159138A - Apparatus for shielding electromagnetic wave of mat

Info

Publication number: CN1159138A
Application number: CN96120178A
Authority: CN
Inventors: 李文行
Original assignee: SEMO CO Ltd
Current assignee: SEMO CO Ltd
Priority date: 1995-11-01
Filing date: 1996-11-01
Publication date: 1997-09-10
Anticipated expiration: 2016-11-01
Also published as: KR970025470U; CN1102018C; JPH09197073A

Abstract

The invention relates to a device, wherein a shielding fabric is used to make electric blanket form zero or low potential so as to reduce electromagnetic wave strength, thereby eliminating uncomfortable potential phenomenon.

Description

Be used to shield the electromagnetic device of electric blanket

The present invention relates to a kind of blanket that electroheat member is arranged in its main body.Exactly, the present invention relates to a kind of electromagnetic device that is used to shield electric blanket, by a kind of loomage the current potential of electric blanket become zero or earthy way reduce electromagnetic intensity in the hope of easy and cosily have a rest.

Domestic power supply mainly can be divided into two classes, such as single 2 lines and single 3 line classes.In single 2 line classes, be added with on the line and be close to null current potential or earth potential, then be added with the current potential of 110 volts or 220 volts on another line usually.Single 3 line styles have the 3rd an additional line, and its current potential and earth potential equate.According to the difference of line method of attachment, optionally the current potential of 110 volts or 220 volts is added to single 3 line styles and gets on.

Generally, when using a kind of article such as blanket etc. (it adopts an electric calorifie installation usually), because a kind of potential difference, the potential phenomenon that people feel is a kind of bad sensation.In the potential phenomenon that exists in the article of electric blanket and so on, its potential difference changes along with the variation of electric wire connection method.The best way that removes this potential difference is to spread a loomage in the blanket top and make the electric field of being responded to from the blanket be drawn towards the earth.But said method has exposed a problem: power supply does not lead to the earth usually.

Now, control system that is used to address the above problem is manufactured comes out and sales to consumers.In above control system, adopt the approximate current potential identical that adds power supply being derived to link the way that the earth gets on earth potential, the electric field strength of sensing on the loomage has been attenuated.But this control system does not adopt directly grounded method, but takes the virtual earth method relevant with power supply.This control system also adopts a kind of like this method: adopt the low relatively current potential of way selection that compares potential difference with a neon glim lamp transducer between each input power supply.But, in the relevant detection method of a kind of with above neon glim lamp transducer, exist many problems, because discharge voltage is different with cut-ff voltage, and the detection characteristic is different from a transducer to another transducer.Owing to exist these problems, this neon glim lamp transducer just might be worked very badly, and the result will be connected to a relative higher voltage and get on, and this relative higher voltage will cause producing the problem that increases potential phenomenon.

The purpose of this invention is to provide and a kind ofly be used to shield the electromagnetic wave of electric blanket and do not have the device of those problems that the top said, so that people can obtain lighter, more comfortable sleep, described electrostatic phenomenon is because due to electromagnetic wave and the potential difference by reducing electrostatic phenomenon more completely.

To achieve these goals, a kind of electromagnetic device that is used to shield electric blanket of shield member 60 of the present invention that adopts has charged source binding post L1, the 3 line power lines 10 of L2 and ground termination terminal L3; Tape relay K1-A, K1-B also uses disconnection relay K 1-A, and the way of K1-B is cut off the relay unit 20 of the voltage of supplying with by 3 line power lines 10; Transformer 30, it is connected to the power-line terminal L1 of 3 line power lines 10, on the L2, in transformer 30, the 1st power supply and the 2nd power supply are independent to come, and purpose is to obtain a stable voltage when transformer detects a potential difference between the 1st and the 2nd power supply when; A detection part 40 is used to detect the potential difference between the input power supply, and this detection part 40 has a bridge rectifier BD1 and a filter circuit R, and C also is for conversion into the potential difference of sensing the AC component on the shield member 60 potential difference of DC component; A detection part 50 has relay K 2, and K3 and K4 are used to detect the ground state that 3 line power lines 10 is inserted socket wherein; A control assembly 70, it reads to be transformed into the intensity of variation in the potential difference of DC and this intensity of variation to be stored in a certain zone of memory by means of detection part 40 and goes.If checkout gear 50 is judged plug ground connection, then by making screening arrangement 60 from holding L3 with being dynamically connected, make the electric field decay of being responded to; If checkout gear 50 judges that plug is unearthed, then make the electric field decay by making screening arrangement 60 produce the electromotive force identical with earth potential.

At a kind of electromagnetic device that is used for shielding electric blanket of the present invention, shield member 60 comprises a loomage 60a, an insulator 60b, a heater block 60c, wherein insulator 60b be placed between loomage 60a and the heater block 60c and its width greater than 5mm.

The embodiment that reads following indefiniteness referring to accompanying drawing will have a better understanding to the present invention, and these accompanying drawings are as follows.

Fig. 1 is a circuit diagram, it shows one embodiment of the present of invention a kind of structure that is used to shield the electromagnetic device of electric blanket.

Fig. 2 A and 2B are flow charts, and it shows some steps that are used to finish operation in tandem of the microcontroller that is shown in Fig. 1.

Fig. 1 shows the structure of electromagnetic device that is used to shield electric blanket of one embodiment of the present of invention.One 3 line power line 10 has power-line terminal L1, L2 and ground connection binding post L3.A relay unit 20 has relay K 1-A, K1-B.These relay unit 20 usefulness disconnect relay K 1-A, and the way of K1-B is cut off and is fed to the voltage that electric blanket gets on by 3 line power lines.A transformer 30 is connected to the power-line terminal L1 of 3 line power lines 60, on the L2, in transformer 30, the 1st power supply and the 2nd power supply are independent, in order that obtain a stable voltage when transformer 30 detects potential difference between the 1st and the 2nd power supply.A detection part 40 has a bridge rectifier BD1 and a filter circuit R, C.Detection part 40 detects the potential difference between the input power supplys and the current potential of AC component that shield member 60a is responded to is transformed into the current potential of DC component.Another detection part 50 has relay K 2, K3 and K4, and detect the socket that 3 line power lines 10 insert wherein and whether be in ground state.Control device 70 reads to be transformed into the intensity of variation in the potential difference of flip-flop and this intensity of variation is stored in a certain zone in the memory with detection part 40 and goes.If checkout gear 50 is judged plug ground connection, 70 of control device by make screening arrangement 60 automatically with receiving end L3 electric field is decayed; If checkout gear 50 judges that plug is unearthed, then control device 70 makes the electric field decay by making screening arrangement 60 produce the current potential identical with earth potential.In a preferred embodiment of the invention, shield member 60 is made up of following part: loomage 60a, and insulator 60b, heater block 60c, wherein insulator is placed between loomage 60a and the heater block 60c.Insulator 60b it is desirable to width greater than 5mm.Control device 70 for example is a microcontroller.

Because above-mentioned structure, technical characterstic of the present invention has been to use 3 line power lines 10 with ground connection binding post L3, and under the 1st power supply and situation that the 2nd power supply separates, utilizes transformer 30 to obtain burning voltages and accurately detect potential difference.

Relay unit 20 or semiconductor device (not shown) can cut off the power supply that is added on the electric blanket.Detection part 40 reads the potential difference between the input power supply.Utilizing checkout gear 50 to come whether ground connection of test plug, can be that the connected mode of loomage 60a is selected to screening arrangement 60, so that the electric field ground connection of being responded on it.

In addition, the present invention also can be provided with the method for an error-detector circuit that detects error when being used for device when above-mentioned shielding electromagnetic wave by maloperation and make it to work definitely.

Another technical characterstic of the present invention is to have strengthened the ground connection effect by means of the way that insulator 60b is had greater than the width of 5mm.

Fig. 2 A and 2B are flow charts.The figure shows the step that is used to finish sequentially-operating of microcontroller shown in Figure 1.The action that is used to shield the electromagnetic device of electric blanket of the present invention will be described as follows with Fig. 2.

1) when being added to, initialize power produces an audio signal when microcontroller 70 gets on.Then, cut off two power lines that have been added to the power supply that electric blanket gets on the way of engage relay R1-A and K1-B, to read the potential difference (step S1) between these two power lines.

2) establishing the input power supply is L1, L2, and making the binding post on the loomage 60a on the top section that is connected to electric blanket is L4, being connected to a supply socket (its ground state the is still unknown) ground wire that gets on is L3.Detect L1, each current potential between L2 or L3 and the L4.After the potential difference of the interchange of having been sensed by above-mentioned detection part (AC) component was transformed into DC, the intensity of variation of the potential difference after the conversion read and stores with microcontroller 70.

3) wish between loomage 60a and heater block 60c, to form a distance greater than 5mm to increase the ground connection effect.

Tell about the method that is used to select ground connection below.

1) the power supply usefulness that has been added on the electric blanket is cut off the way of K1 closure.Then, with the method that makes the K5 closure input power supply is transformed on the detection part 40 to detect the potential difference (step S2) between the input power supply.

2) potential difference between the binding post L4 of input power supply L1 and loomage 60a detects with the method that makes the K2 closure and the potential difference that this is experienced is referred to as A (step S3).With the way that keeps the same terms, by means of making the K4 closure, and ground wire L3 is connected to input power supply L1 carries out conversion to potential difference and the potential difference of handle after conversion is called for B (step S4).In this case, if this potential difference B has been reduced greater than potential difference A half, the outlet ground that decidable is used power supply source.Afterwards, cut off input power supply L4 also makes loomage 60a with the method that makes the K4 closure binding post ground connection (step S5 and S6) with the method that K2 is disconnected.

3), then make K2 and K4 closure if potential difference B does not reduce the over half of potential difference A.Then, detect the potential difference between the binding post L4 of input power supply L2 and loomage 60a and detected potential difference is referred to as C (step S5 and S7) with the way that makes the K3 closure.By means of keeping identical condition,, earth connection L3 is linked input power supply L2 potential difference is carried out conversion and the potential difference after the conversion is called D (step S8) with the way that makes the K4 closure.In this case, if potential difference D has been reduced the over half of potential difference C, the outlet ground that decidable is used power supply source.Then, cut off input power supply L2 with the method that K3 is disconnected, and with the method that makes the K4 closure the binding post L4 ground connection (step S9 and S10) of loomage 60a.

4) if potential difference D does not reduce the over half of potential difference C, then A and C are compared.If the difference between A and the C, judges then that power supply L1 and L2 comprise earth potential greater than 0.5 volt.Afterwards, the method by finding the current potential identical with earth potential is the binding post ground connection of loomage 60a.Then, sensed on the binding post L4 of loomage 60a electric field with the method that makes the K3 closure transform to L2 go up (step S11, S12, S13).If A, then judges the current potential of input power supply L1 less than C and is close to identical with earth potential.Then, the electric field on the binding post L4 of sensed loomage 60a transforms to L1 with the method that makes the K3 closure and goes up (step S11, S12 and S15).

5) if the comparative result of A and C in 0.5 volt, concludes then that power supply L1 and L2 do not comprise earth potential.Then, the binding post L4 that power supply L1 is connected to that power supply L2 goes up and the core of L1 and L2 is connected to loomage 60a goes up (step S11 and S14).

6) method of the potential difference by detecting each binding post is transformed into the potential difference of sensed AC component after the potential difference of DC component, and microcontroller 70 just reads the degree of variation the potential difference after conversion.After the selection of having finished above-mentioned earthing method, just prepare one and be used to be added to the power supply that electric blanket gets on, and with the method that makes the K5 disconnection binding post of loomage 60a is transformed to and is grounded with the method that K1 is disconnected.

7) after having finished ground connection, earthing method shows the audio signal of finishing (step 17) with regard to representing with the form of a signal specific and sending one.

According to detailed description, can eliminate fully because the electrostatic phenomenon due to electromagnetic field and the potential difference, so people can obtain easily, comfortable sleep to the invention described above.

Though the electromagnetic device that is used to shield electric blanket is just as describing in detail in the text, be those purposes that can obtain telling about above fully and advantage, but be understood that only a preferred embodiment of the present invention of these explanations, the details of the structure in the literary composition or design or method all do not meant that be subject to this, remove outside described in the accessory claim.

Claims

1. electromagnetic device that is used to shield electric blanket, this device has shield member 60, it is characterized in that it is made of following part:

, 3 line power lines 10, it has power-line terminal L1, L2 and earth terminal L3;

A relay unit 20, it has relay K 1-A, K1-B, and by disconnecting relay K 1-A, the way of K1-B is cut off by 3 line power lines 10 for the voltage toward electric blanket;

A transformer 30, it is connected to the power-line terminal L1 of 3 line power lines 10, and L2 is last and obtaining a stable voltage under the 1st power supply and the discrete situation about coming of the 2nd power supply when transformer 30 detects between the 1st and the 2nd power supply potential difference;

A detection part 40 is used to detect the potential difference between the input power supply, and this detection part 40 has bridge rectifier BD1 and a filter circuit R, C, and the AC component potential difference on the sensed shield member 60 is transformed into the potential difference of DC component;

A detection part 50, it has relay K 2, K3, K4 also is used to detect the ground state that 3 line power lines 10 is inserted into socket wherein; With

A control assembly 70, it reads with detection part 40 and is transformed into intensity of variation in the potential difference of DC component, and intensity of variation is stored in a certain zone of memory and go.If checkout gear 50 is judged plug ground connection, 70 of control device by make screening arrangement 60 automatically with receiving end L3 electric field is decayed; If checkout gear 50 judges that plug is unearthed, then control device 70 makes the electric field decay by making screening arrangement 60 produce the current potential identical with earth potential.

2. the electromagnetic device that is used to shield electric blanket according to claim 1, wherein shield member 60 is made up of following part: loomage 60a, insulator 60b, heater block 60c, and wherein insulator 60b be placed between loomage 60a and the heater block 60c and its width greater than 5mm.