CN201523231U - Safety protection device - Google Patents
Safety protection device Download PDFInfo
- Publication number
- CN201523231U CN201523231U CN2009202660180U CN200920266018U CN201523231U CN 201523231 U CN201523231 U CN 201523231U CN 2009202660180 U CN2009202660180 U CN 2009202660180U CN 200920266018 U CN200920266018 U CN 200920266018U CN 201523231 U CN201523231 U CN 201523231U
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- CN
- China
- Prior art keywords
- power supply
- control circuit
- safety guard
- relay
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a safety protection device, and relates to a safety protection device forcibly connecting an electric device with an earth wire. The device comprises a detection circuit and a control circuit, wherein the positive pole of a luminescent tube of the detection circuit is connected with the power source, the negative pole thereof is connected with an earth cable port, and a photosensitive element of the control circuit controls the actuation of a relay according to the received detection signal of the luminescent tube, thereby controlling the conduction of the electric device and the power source. The device can forcibly connect the power source of the electric device with the earth wire, otherwise the electric device is not powered on, thereby preventing people or organisms from electric shock, and protecting the safety of people and other organisms.
Description
Technical field:
The utility model relates to a kind of electrical appliance safety guard, specifically relates 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.
The utility model content:
The utility model purpose 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 utility model provides a kind of security performance good safety guard, and this device comprises testing circuit and control circuit, it is characterized in that: testing circuit one end connects power supply, and the other end connects the ground terminal of power consumption equipment power supply input; Described testing circuit also links to each other with control circuit, the conducting of described control circuit control power consumption equipment and power supply; Described control circuit one end connects the power consumption equipment power input, and the other end connects power supply through the transformer rectification circuit.
An optimal technical scheme of the present utility model is: the described testing circuit of described safety guard comprises high value resistor, high-voltage diode and luminous tube; described high value resistor and high-voltage diode series connection; the high value resistor end of described series connection links to each other with live wire with the zero line of power supply respectively; the high-voltage diode end of described series connection is connected with luminous tube is anodal after rectification, and described luminous tube negative pole is connected with the ground terminal of electric equipment power supply input and the ground wire mouth of power supply.
Another optimal technical scheme of the present utility model is: the described control circuit of described safety guard comprises; light-sensitive element, amplifying circuit and relay; described light-sensitive element is connected with the luminous tube of described testing circuit; receive the signal of luminous tube after amplifying circuit is passed to relay after amplifying; thereby the disconnection of control relay and adhesive, described relay is installed the input of power consumption equipment power supply.
Originally be one of utility model more preferably technical scheme be: the resistance of the described high resistance measurement of described safety guard for 10M Ω to 50M Ω.
Originally be utility model another more preferably technical scheme be: the described high-voltage diode of described safety guard adopts the high-voltage diode of 500V to 3000V
Originally be utility model again one more preferably technical scheme be: relay in the described control circuit of described safety guard adopts the thyristor reverse-blocking tetrode thyristor to replace.
Originally be that utility model most preferred technique scheme is: the described power supply of described safety guard adopts the AC power of 220V or 380V.
The utility model beneficial effect: if adopt the power consumption equipment of the utility model device 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 the utility model integrated circuit connection diagram;
The circuit connection diagram of Fig. 2 the utility model testing circuit;
The circuit connection diagram of Fig. 3 the utility model control circuit.
Embodiment:
As shown in Figure 1, the utility model safety guard 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 ground terminal 3 of electric equipment power supply 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.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 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.
Adopt the utility model device, 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 explanation the technical solution of the utility model but not it is limited; although the utility model 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 embodiment of the present utility model; and do not break away from any modification of the utility model spirit and scope or be equal to replacement, all should be encompassed in the claim protection range of the present utility model.
Claims (7)
1. safety guard, this device comprises testing circuit (1) and control circuit (2), it is characterized in that: testing circuit (1) one end connects power supply, and the other end connects the ground terminal (3) of power consumption equipment power supply input; Described testing circuit (1) also links to each other with control circuit (2), the conducting of described control circuit (2) control power consumption equipment and power supply; Described control circuit one end connects the power consumption equipment power input, and the other end connects power supply through the transformer rectification circuit.
2. a kind of safety guard according to claim 1; it is characterized in that: described testing circuit (1) comprises high value resistor, high-voltage diode and a luminous tube; described high value resistor and high-voltage diode series connection; the high value resistor end of described series connection links to each other with live wire with the zero line of power supply respectively; the high-voltage diode end of described series connection is connected with luminous tube is anodal after rectification, and described luminous tube negative pole is connected with the ground terminal (3) of electric equipment power supply input and the ground wire mouth of power supply.
3. a kind of safety guard according to claim 1; it is characterized in that: 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); receive the signal of luminous tube after amplifier is passed to relay (4) after amplifying; thereby the disconnection and the adhesive of control relay (4), described relay (4) is installed the input of power consumption equipment power supply.
4. a kind of safety guard according to claim 2 is characterized in that: the resistance of described high resistance measurement for 10M Ω to 50M Ω.
5. a kind of safety guard according to claim 2 is characterized in that: described high-voltage diode adopts the high-voltage diode of 500V to 3000V.
6. a kind of safety guard according to claim 3 is characterized in that: the relay in the described control circuit (4) adopts the thyristor reverse-blocking tetrode thyristor to replace.
7. a kind of safety guard according to claim 1 and 2 is characterized in that: described power supply adopts the AC power of 220V or 380V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202660180U CN201523231U (en) | 2009-11-03 | 2009-11-03 | Safety protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202660180U CN201523231U (en) | 2009-11-03 | 2009-11-03 | Safety protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201523231U true CN201523231U (en) | 2010-07-07 |
Family
ID=42509407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202660180U Expired - Fee Related CN201523231U (en) | 2009-11-03 | 2009-11-03 | Safety protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201523231U (en) |
-
2009
- 2009-11-03 CN CN2009202660180U patent/CN201523231U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100707 Termination date: 20131103 |