CN102055165A - Security protection device - Google Patents
Security protection device Download PDFInfo
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- CN102055165A CN102055165A CN200910210470XA CN200910210470A CN102055165A CN 102055165 A CN102055165 A CN 102055165A CN 200910210470X A CN200910210470X A CN 200910210470XA CN 200910210470 A CN200910210470 A CN 200910210470A CN 102055165 A CN102055165 A CN 102055165A
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- power supply
- luminous tube
- safety guard
- diode
- resistance
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Abstract
The invention discloses a security protection device, relating to a security protection device which forces to connect an electrical appliance with an earth wire. The security protection device comprises a detection circuit and a control circuit, wherein the anode of the luminotron of the detection circuit is connected with a power supply after rectified, and a cathode of the luminotron is connected with an electrical appliance and an earth wire interface; and the light sensitive element of the control circuit controls the actuation of a relay according to a received luminotron detection signal so as to control the electrical appliance to be connected with the power supply. The device can force the power supply of the electrical appliance to be connected with the earth wire, otherwise, the electrical appliance and the power supply are not conducted, thereby protecting people or living beings from electric shock and protecting the safety of people and other living beings.
Description
Technical field:
The present invention relates to a kind of electrical appliance safety guard, specifically relate to a kind of safety guard of forcing the electrical appliance earth connection.
Background technology:
Electric shock can seriously jeopardize personal safety, if people on one's body the long period flow through let-go current greater than self (IEC report, 60 kg body weight men be 10mA, the women is 70%, children are 40%), will fall down, go into a coma and death.So being the overriding concern of household electronic products Safety Design, protection against electric shock arrives content.According to statistics, annual China household electrical appliance cause the number of getting an electric shock and dying to surpass 1/3 in the number because of electric shock causes death.Therefore, electrocution-proof protection is the problem that at first should consider in the safety standard.
Household electrical appliance power supplies is the single-phase three wire system low-voltage power supply system, and what introduce family is wherein phase line and zero line, and it is efficient ways that this system adopts the protection connecting to neutral.Making one of this zero connection protection reliable premise, is that zero line is wanted iterative earthing.International Electrotechnical Commission (IEC) regulation; in one section circuit from special-purpose distribution transformer to the building entrance, working zero line and protection zero line can be shared, and will be connected on before registering one's residence on the earth electrode of building; draw protection zero line, i.e. a ground wire behind the house lead in addition.The new building thing all should adopt this protection connecting to neutral method, and selects the electrical installation that meets the international standard regulation for use, and the following circuit of 10A is selected flat three pole sockets for use.In the present most ofs civilian old building, still do not have the zero line iterative earthing, do not establish one in addition yet and protect zero line, household appliances shell is connect earthing method on natural grounding substances such as running water pipe, steam heating pipe though there is the people to adopt.But, make earth resistance surpass permissible value (4 Ω) because the water pipe junction often has things such as lead oil, linen thread to fill.When power supply in the household electrical appliance had one to be connected shell, because of earth resistance is bigger, fuse can not fuse, and can make metal shell charged for a long time, brought potential safety hazard to the user.
Summary of the invention:
The object of the invention is to provide a kind of pressure electrical appliance power input to connect power ground, otherwise can not be with power turn-on, the electrical appliance protective device of high security.
For achieving the above object, the invention provides a kind of safety guard, this device comprises testing circuit and control circuit, it is characterized in that:
Described testing circuit comprises resistance, diode and luminous tube, described resistance and diode series connection, the resistance terminal of described series connection links to each other with live wire with the zero line of power supply respectively, described diode in series end is connected with luminous tube is anodal after rectification, and described luminous tube negative pole is connected with the interface of the ground wire of electric equipment power input and the ground wire mouth of power supply;
Described control circuit comprises, light-sensitive element, amplifier and relay, described light-sensitive element is connected with the luminous tube of described testing circuit, the signal that receives luminous tube is passed to relay after amplifier amplifies, the disconnection of control relay and adhesive, described relay connects the input of power consumption equipment power supply.
An optimal technical scheme of the present invention is: the described resistance of described a kind of safety guard adopts the high value resistor of 10M Ω to 50M Ω.
Another optimal technical scheme of the present invention is: the described diode of described a kind of safety guard adopts the high-voltage diode of 500V to 3000V.
An optimal technical scheme more of the present invention is: the described power supply of described a kind of safety guard adopts the AC power of 220V or 380V.
The 4th optimal technical scheme of the present invention is: also be provided with resistance and electric capacity into supply voltage filtering between the described control circuit of described a kind of safety guard and the transformer.
The 5th optimal technical scheme of the present invention is: the luminous tube negative pole of the described testing circuit of described a kind of safety guard also is connected with the socket of external ground wire.
Beneficial effect of the present invention: if adopt the power consumption equipment of apparatus of the present invention not have earth connection then can energized; thereby force the power consumption equipment earth connection, prevent that to reach the user from getting an electric shock, the effect of the protection person and other bio-safety; and this device directly is not connected with power supply, and is safe and reliable.
Description of drawings:
Fig. 1 integrated circuit connection diagram of the present invention;
The circuit connection diagram of Fig. 2 testing circuit of the present invention;
The circuit connection diagram of Fig. 3 control circuit of the present invention.
Embodiment:
Embodiment 1
As shown in Figure 1, safety guard of the present invention comprises: testing circuit 1 and control circuit 2.As shown in Figure 2, testing circuit 1 comprises: two high value resistor R1, R2, two high-voltage diode D1, D2 and a luminous tube D4.R1, R2 adopt the high value resistor of 10M Ω to 50M Ω, and D1, D2 then adopt the high value resistor of 500V to 3000V.Two high value resistor R1, R2 are respectively and two high-voltage diode D1, D2 series connection, the high value resistor end of series connection links to each other with live wire N with the zero line L of power supply respectively, the high-voltage diode end of series connection is connected with luminous tube D4 is anodal after rectification, luminous tube D4 negative pole is connected with the interface of the ground wire 3 of electric equipment power input and the ground wire mouth of power supply, and luminous tube D4 also is connected with control circuit 2.As shown in Figure 3, control circuit 2 comprises: light-sensitive element R6, amplifying circuit and relay 4.Amplifying circuit is made up of a plurality of resistance and triode.Light-sensitive element R6 is connected with the luminous tube D4 of testing circuit 1, receive the signal of luminous tube D4 after amplifying circuit sends the relay 4 that is installed in the power consumption equipment power input to after amplifying, thereby reach according to the conducting that receives testing circuit 1 detected ground signalling control power consumption equipment and power supply.Control circuit 2 is reliable through transformer rectification circuit and power supply attachment security, applicable to the AC power of 220V and 380V.Relay 4 in the control circuit 2 also can adopt reverse-blocking tetrode thyristor to replace.
Power consumption equipment behind this device is installed, and when the ground wire mouth 3 of power supply does not have real being connected with ground wire, the luminous tube D4 of this device testing circuit 1 then can not send signals to control circuit 2, the relay 4 not adhesives of control circuit 2, power consumption equipment not can with power turn-on.When the ground wire mouth of power supply real be connected with ground wire the time, the luminous tube D4 of testing circuit 1 has weak current, produces light source, connected photo resistance R6 receives light signal, pass to relay 4 after amplifying circuit amplifies, control relay 4 adhesives make power consumption equipment and power turn-on.
Selecting technology scheme of the present invention is on the basis of embodiment 1: the luminous tube negative pole of the testing circuit 1 of safety guard also can be installed a circumscription socket, and being used for does not have external ground wire under the situation of ground wire at power supply, guarantees being connected of electrical appliance and ground wire.
Adopt apparatus of the present invention, force power consumption equipment to be connected with ground wire, thereby prevent that the user from getting an electric shock, guarantee personal safety, because this device directly is not connected with power supply, the fail safe of device itself also improves greatly.
Should be noted that at last; above embodiment is only in order to technical scheme of the present invention to be described but not it is limited; although the present invention is had been described in detail with reference to the foregoing description; described art is to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and not break away from all should being encompassed in of the spirit and scope of the invention claim protection range of the present invention.
Claims (6)
1. safety guard, this device comprises testing circuit 1 and control circuit 2, it is characterized in that:
Described testing circuit (1) comprises resistance, diode and luminous tube, described resistance and diode series connection, the resistance terminal of described series connection links to each other with live wire with the zero line of power supply respectively, described diode in series end is connected with luminous tube is anodal after rectification, and described luminous tube negative pole is connected with the interface of the ground wire (3) of electric equipment power input and the ground wire mouth of power supply;
Described control circuit (2) comprises, light-sensitive element, amplifier and relay (4), described light-sensitive element is connected with the luminous tube of described testing circuit (1), the signal that receives luminous tube is passed to relay (4) after amplifier amplifies, the disconnection and the adhesive of control relay (4), described relay (4) connects the input of power consumption equipment power supply.
2. a kind of safety guard according to claim 1 is characterized in that: described resistance adopts the high value resistor of 10M Ω to 50M Ω.
3. a kind of safety guard according to claim 1 is characterized in that: described diode adopts the high-voltage diode of 500V to 3000V.
4. a kind of safety guard according to claim 1 is characterized in that: described power supply adopts the AC power of 220V or 380V.
5. a kind of safety guard according to claim 1 is characterized in that: also be provided with resistance and electric capacity into supply voltage filtering between described control circuit and the transformer.
6. a kind of safety guard according to claim 1 is characterized in that: the luminous tube negative pole of described testing circuit (1) also is connected with the socket of external ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910210470XA CN102055165A (en) | 2009-11-03 | 2009-11-03 | Security protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910210470XA CN102055165A (en) | 2009-11-03 | 2009-11-03 | Security protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102055165A true CN102055165A (en) | 2011-05-11 |
Family
ID=43959248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910210470XA Pending CN102055165A (en) | 2009-11-03 | 2009-11-03 | Security protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102055165A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614629A (en) * | 2015-01-19 | 2015-05-13 | 国家电网公司 | Grounding detection discrimination circuit |
| CN106786476A (en) * | 2017-03-06 | 2017-05-31 | 深圳市景创科技电子有限公司 | A kind of safety protective circuit and electronic equipment |
-
2009
- 2009-11-03 CN CN200910210470XA patent/CN102055165A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104614629A (en) * | 2015-01-19 | 2015-05-13 | 国家电网公司 | Grounding detection discrimination circuit |
| CN106786476A (en) * | 2017-03-06 | 2017-05-31 | 深圳市景创科技电子有限公司 | A kind of safety protective circuit and electronic equipment |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110511 |