CN1725587A - Universal shock-proof wall device for electric iron controlled by single chip machine - Google Patents
Universal shock-proof wall device for electric iron controlled by single chip machine Download PDFInfo
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- CN1725587A CN1725587A CN 200410054812 CN200410054812A CN1725587A CN 1725587 A CN1725587 A CN 1725587A CN 200410054812 CN200410054812 CN 200410054812 CN 200410054812 A CN200410054812 A CN 200410054812A CN 1725587 A CN1725587 A CN 1725587A
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- electric iron
- ground wire
- processing unit
- central processing
- earth
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Abstract
This invention discloses an anti-electric wall device generally used by electric irons controlled by single-chip processors, especially relates to an anti-electric wall technology when the iron earth and the basic insulation fail at the same time, which create the order connection of zero-earth potential difference test device, a central processor and a relay executing circuit characterizing that a transformer or a RC step-down circuit is set between the earth and zero line to be connected with I/O input port of a single-chip process by a switch tube, which receives the voltage difference signal between zero and earth to switch off the power supply of the earth and electric iron when the earth is on.
Description
Anti-electric wall technology when technical field the invention belongs to microchip technology field and is particularly related to electric iron ground wire and basic insulation and lost efficacy simultaneously.
Background technology is well-known, and it must be reliably that the electric iron product standard requires the ground connection in the user family, and the standard plug that the band ground wire also is housed in its product is for linking to each other good with assurance ground connection with ground wire in the socket.And in China, power utilization environment is poor, and the ground connection of many buildings is insecure, or even lack.In this case, qualified electric iron can not guarantee user's safety.The anti-electric wall technology that the invention relates to is special in China's actual conditions, is intended to guarantee under unsafe power utilization environment user's safety.And before the invention applying date, electric iron does not have the personal safety protector that cut off ground wire and electric iron power supply when ground wire and basic insulation lost efficacy simultaneously in real time, brings potential safety hazard for the user who does not have good earth.
The purpose of summary of the invention the invention is exactly to overcome the shortcoming that the above-mentioned prior art of electric iron exists, providing a kind of had when this electric iron ground wire and basic insulation lost efficacy simultaneously, can cut off the power supply of ground wire and electric iron in real time, even under dangerous power utilization environment, also can guarantee user's safety.The relay circuit of the invention guarantees that simultaneously electric iron recovers or do not influence normal use when ground wire is not charged.
The invention solves the technical scheme that its technical problem adopts: the invention is provided with cross-over connection in ground wire E
INAnd the potential difference detecting device between zero line N (1), this device provides ground wire normal or charged logical signal to central processing unit (2) I/O input port, and central processing unit (2) is by the break-make of I/O output port control relay executive circuit.Relay executive circuit (3) is by drive circuit Q
1, Q
2And relay J
1, J
2Form, be serially connected with ground wire E respectively at its normally-closed contact, normally opened contact
IN, E
OUTAnd electric iron power supply L
IN, L
OUTRelay executive circuit (3) is controlled by central processing unit (2), cuts off being serially connected in relay J when ground wire electrification
1, J
2Ground wire and electric iron power supply.Under normal circumstances, the relay normally-closed contact is guaranteed ground wire E
IN,, E
OUTAnd electric iron power supply L
IN, L
OUTConnection.
The advantage of the invention is simple in structure, and highly versatile is suitable for all kinds of electric iron and installs, and effect is obvious, does not influence the use under the ground wire normal condition, its central processing unit also can with electric iron single chip machine controlling circuit shared resource.
Description of drawings Fig. 1 is the circuit structure block diagram of the invention.Wherein (1) is that zero grounding potential difference detector set (2) is central processing unit, and (3) carry out electric iron for relay.
Fig. 2 is the electrical schematic diagram of the invention.E among the figure
INBe ground wire end of incoming cables, E
OUTBe the ground wire leading-out terminal, promptly link to each other with the electric iron earth terminal; L
INBe live wire end of incoming cables, L
OUTBe the live wire leading-out terminal, promptly link to each other with electric iron live wire end; N is a zero line, and 12V is the 12V DC power supply.
Embodiment the invention embodiment central processing unit adopts PIC16C54 (PIC16C57) chip microprocessor able to programme, and as previously mentioned, this chip microprocessor can be shared with the single chip machine controlling circuit of electric iron.Cross-over connection is in zero line N and ground wire E
INBetween potential difference detecting device by transformer T or resistance-capacitance circuit R
1C
1(among Fig. 2 shown in the dotted line) step-down, D
1～D
4Diode rectification, capacitor C
0, voltage-stabiliser tube the DW voltage stabilizing circuit and the switching tube Q that form
0Form switching tube Q
0Be connected in central processing unit I/O input port, I/O output port control relay executive circuit Q
1, Q
2, J
1, J
2The relay normally-closed contact connects ground wire E
INAnd E
OUT, normally opened contact connects electric iron L
INAnd L
OUT
Operation principle summary: electric iron under the situation that ground connection and basic insulation lost efficacy simultaneously, zero line N and ground wire E
INBetween voltage between 36V-220V, cross-over connection is in zero line N and ground wire E
INOn transformer reduction voltage circuit or resistance-capacitance depressurization circuit produce the 1.5-6V dc pulse voltage by rectification circuit, make switching tube Q
0Conducting is to central processing unit output low level signal.Q in the relay executive circuit
1, Q
2Be respectively J
1, J
2Drive circuit.When the I/O output makes Q
1Or Q
2During for low level, the actuating of relay disconnects the ground wire E that is connected on its normally-closed contact
INAnd E
OUTAnd the L of normally opened contact (being normally-closed contact during work)
INAnd L
OUT
Claims (4)
1, the general electricity-preventing wall device of a kind of monolithic processor controlled electric iron, its principal character is the potential difference detecting device (1) that is provided with between cross-over connection ground wire E and zero line N, this device provides potential difference signal between ground wire and zero line to central processing unit (2) I/O input port, central processing unit (2) cuts off the ground wire E that is connected on the relay normally-closed contact in real time by the break-make of I/O output port control relay executive circuit (3) when ground wire electrification
OUTAnd the power supply L of electric iron
OUT
2, the general electricity-preventing wall device of monolithic processor controlled electric iron according to claim 1 is characterized in that cross-over connection is in zero line N and ground wire E
INBetween potential difference detecting device (1) by transformer T or resistance-capacitance circuit R
1C
1Step-down, D
1～D
4Diode rectification, capacitor C
0, voltage-stabiliser tube the DW voltage stabilizing circuit and the switching tube Q that form
0Form switching tube Q when ground wire electrification
0Provide logical signal (present embodiment is a low level) to central processing unit (2) I/O input port.
3, the general electricity-preventing wall device of monolithic processor controlled electric iron according to claim 1 is characterized in that (a) central processing unit (2) is a programmable microprocessor; (b) zero line N and ground wire E
INBetween potential difference detecting device (1) output signal connect the I/O input port of central processing unit (2); (c) switching tube Q in the relay executive circuit (3)
1, Q
2The I/O output port that is controlled by central processing unit (2), relay J
1, J
2Be controlled by switching tube Q
1, Q
2And control the break-make of ground wire and electric iron power supply respectively.
4, the general electricity-preventing wall device of monolithic processor controlled electric iron according to claim 1, it is characterized in that described central processing unit (2) can be provided with separately also can with the central processing unit shared resource in the electric iron control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410054812 CN1725587A (en) | 2004-07-21 | 2004-07-21 | Universal shock-proof wall device for electric iron controlled by single chip machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410054812 CN1725587A (en) | 2004-07-21 | 2004-07-21 | Universal shock-proof wall device for electric iron controlled by single chip machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1725587A true CN1725587A (en) | 2006-01-25 |
Family
ID=35924867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410054812 Pending CN1725587A (en) | 2004-07-21 | 2004-07-21 | Universal shock-proof wall device for electric iron controlled by single chip machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1725587A (en) |
-
2004
- 2004-07-21 CN CN 200410054812 patent/CN1725587A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |