CN1599178A - Universal shockproof wall device for electric cooker controlled by SCM - Google Patents
Universal shockproof wall device for electric cooker controlled by SCM Download PDFInfo
- Publication number
- CN1599178A CN1599178A CN 200410069570 CN200410069570A CN1599178A CN 1599178 A CN1599178 A CN 1599178A CN 200410069570 CN200410069570 CN 200410069570 CN 200410069570 A CN200410069570 A CN 200410069570A CN 1599178 A CN1599178 A CN 1599178A
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- CN
- China
- Prior art keywords
- ground wire
- electric cooker
- processing unit
- central processing
- zero line
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Abstract
The invention discloses an anti-electric wall device used in the electric cookers controlled by the monolithic processor and belongs to the application field of the monolithic processor technology. The invention especially relates to the anti-electric wall technology used in protecting the personal safety when the ground wire and basic insulation of the electric cookers are invalid at the same time. The invention is made by connecting the detecting device of the potential difference between the zero line and the ground wire, central processing unit and the executive circuit of the relay in order. There is a transformer or a resistance-capacitance step down circuit between the ground wire and the zero line, which connects with the I/O incoming terminal of the monolithic processor through the switching tube. The monolithic processor receives the signal of the voltage difference between the zero line and the ground wire and cut off the ground wire and the power supply of the electric fans when the ground wire is electrified. The invention is adaptable to various control forms of the electric cookers. The anti-electric wall technology of the invention aims to protect the personal safety when the grounding is not reliable or the ground wire is invalid.
Description
Anti-electric wall technology when technical field the invention belongs to microchip technology field and is particularly related to electric cooker ground wire and basic insulation and lost efficacy simultaneously.
Background technology is well-known, and it must be reliably that the electric cooker 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 cooker 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 cooker does not have the personal safety protector that cut off ground wire and electric cooker 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 cooker exists, providing a kind of had when this electric cooker ground wire and basic insulation lost efficacy simultaneously, can cut off the power supply of ground wire and electric cooker 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 cooker 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 cooker 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 cooker power supply.Under normal circumstances, the relay normally-closed contact is guaranteed ground wire E
IN, E
OUT and electric cooker 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 cookers 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 cooker 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 cooker 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 cooker 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 cooker 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 cooker.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
OCT, normally opened contact connects electric cooker L
INAnd L
OUT
Operation principle summary: electric cooker 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 cooker, 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 cooker
OUT
2, the general electricity-preventing wall device of monolithic processor controlled electric cooker 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 cooker 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 cooker power supply respectively.
4, the general electricity-preventing wall device of monolithic processor controlled electric cooker 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 cooker control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410069570 CN1599178A (en) | 2004-07-18 | 2004-07-18 | Universal shockproof wall device for electric cooker controlled by SCM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410069570 CN1599178A (en) | 2004-07-18 | 2004-07-18 | Universal shockproof wall device for electric cooker controlled by SCM |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1599178A true CN1599178A (en) | 2005-03-23 |
Family
ID=34666781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410069570 Pending CN1599178A (en) | 2004-07-18 | 2004-07-18 | Universal shockproof wall device for electric cooker controlled by SCM |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1599178A (en) |
-
2004
- 2004-07-18 CN CN 200410069570 patent/CN1599178A/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 |