CN2679699Y - Detection circuit for electrical safety protector for electronic measurers - Google Patents
Detection circuit for electrical safety protector for electronic measurers Download PDFInfo
- Publication number
- CN2679699Y CN2679699Y CN 200420025071 CN200420025071U CN2679699Y CN 2679699 Y CN2679699 Y CN 2679699Y CN 200420025071 CN200420025071 CN 200420025071 CN 200420025071 U CN200420025071 U CN 200420025071U CN 2679699 Y CN2679699 Y CN 2679699Y
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- input end
- gate
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- sheffer stroke
- optocoupler
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Abstract
The utility model provides a detection circuit for electrical safety protectors of electronic measurers, which is capable of detecting and outputting fault signals and is used for distinguishing fault types and ensuring safe operation. The detection circuit for electrical safety protectors of electronic measurers is formed by that a series circuit composed of one input end of a light-coupled integrated block IC1, a resistor R1 and a homophase diode D1 is bridged between an earth wire and a zero wire; a series circuit which is composed of one input end of a light-coupled integrated block IC2, a resistor R2 and a homophase diode D2 is bridged between a phase wire and the zero wire; a series circuit which is composed of one input end of a light-coupled integrated block IC3, a resistor R3 and a homophase diode D3 is bridged between the phase wire and the earth wire; the output of the light-coupled integrated blocks IC1, IC2, IC3 are respectively connected with a control circuit.
Description
Technical field
The utility model belongs to the electron and electrician safety protection equipment, specifically is electronic measuring instrument electrical safety protective device testing circuit.
Background technology
Widely used single-phase three utmost point supply sockets at present, its three electrodes have clear and definite definition, and promptly the electrode of the upper middle of socket is protective earth (ground wire) end, and the electrode of lower left quarter is center line (zero line) end, and the electrode of bottom righthand side is the phase line (live line) end.And all belong to " I kind equipment " (classification of electrotechnical, electronic equipment protection against electric shock), promptly use the electronic measuring instrument (hereinafter to be referred as instrument) of single-phase three-electrode power plug, and all strict with above-mentioned definition connection, the conductive part switch that having of instrument can be touched links to each other.Like this, when instrument generation safety failure, because of the original conductive part that can touch of instrument (as metal cabinet, metal decking, metal base plate etc.) links to each other with protective earth, phase line (live line) links to each other with power switch by fuse.Like this, when instrument generation safety failure, because of the original conductive part that can touch of instrument (metal cabinet, metal decking, metal base plate etc.) links to each other with protective earth, the conductive part (as metal cabinet, metal decking, metal base plate etc.) that having of instrument can be touched keeps " 0 current potential ", thus protection operating personnel's life safety; When instrument generation fuse blows fault, building disconnected because of instrument is phase line (live line), protection maintenance personal's life safety.
At present all instruments that belong to " I kind equipment " (classification of electrotechnical, electronic equipment protection against electric shock) all do not have the function of discerning single-phase three utmost point supply socket electrode wrongs, when the electrode wrong occurring, will cause electric shock accidents.As:
The protective ground termination electrode misconnection of a, supply socket is to phase line (live line); can cause the original conductive part that can touch of instrument (as metal cabinet, metal decking, metal base plate etc.) charged; when operating personnel touch, can cause electric shock, jeopardize operating personnel's life safety.
During the center line of the phase line (live line) of b, supply socket (zero line) wrong, when instrument generation fuse blows fault, what cut off because of instrument is center line (zero line), causes the whole loop of instrument charged, the life safety that jeopardizes the maintenance personal.
Summary of the invention
The new purpose of this practicality provides a kind of electronic measuring instrument electrical safety protective device testing circuit at the deficiencies in the prior art, and it can detect and export fault-signal, in order to distinguish fault type, guarantees handling safety.
The purpose of this utility model realizes by following measure:
A kind of electronic measuring instrument electrical safety protective device testing circuit, it is characterized in that it will and be connected across with the series arm that diode phase D1 forms between the ground wire E and zero line N of electronic measuring instrument attaching plug by an input end and the resistance R 1 of optocoupler ic chip 1, to and be connected across with the series arm that diode phase D2 forms between the phase line L and zero line N of electronic measuring instrument attaching plug by an input end and the resistance R 2 of optocoupler ic chip 2, to and be connected across with the series arm that diode phase D3 forms between the phase line L and ground wire E of electronic measuring instrument attaching plug by an input end and the resistance R 3 of optocoupler ic chip 3, optocoupler ic chip 1, IC2, the output of IC3 or directly connect single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of DLC (digital logic circuit), or connect the single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of logical circuit by control circuit, convert corresponding status signal to output signal and show or report to the police testing circuit.
Advantage of the present utility model: adopt the new testing circuit of this practicality, when instrument was installed the situation of generating electrodes misconnection, the utility model can be exported fault-signal and give instrument control portion, after control section is received fault-signal, the district in two kinds of situation, light corresponding pilot lamp respectively, and send chimes of doom, submit to operating personnel to note, classification according to pilot lamp, distinguish the classification of fault, fix a breakdown, guarantee safety.
Description of drawings
Fig. 1 is an electrical schematic diagram of the present utility model.
Fig. 2 is an embodiment electrical schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is done an into description:
As shown in Figure 1, electronic measuring instrument electrical safety protective device testing circuit of the present utility model, it will and be connected across with the series arm that diode phase D1 forms between the ground wire E and zero line N of electronic measuring instrument attaching plug CT by an input end and the resistance R 1 of optocoupler ic chip 1, to and be connected across with the series arm that diode phase D2 forms between the phase line L and zero line N of electronic measuring instrument attaching plug CT by an input end and the resistance R 2 of optocoupler ic chip 2, to and be connected across with the series arm that diode phase D3 forms between the phase line L and ground wire E of electronic measuring instrument attaching plug CT by an input end and the resistance R 3 of optocoupler ic chip 3, optocoupler ic chip 1, IC2, the output of IC3 or directly connect single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of DLC (digital logic circuit), or connect the single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of logical circuit by control circuit, convert corresponding status signal to output signal and show or report to the police testing circuit.
In the testing circuit of the present utility model, attaching plug CT indicates the phase line that is of symbol L, indicates the zero line that is of symbol N, what indicate symbol E is protective ground line (abbreviation ground wire).Diode D1, D2, D3 play the unilateal conduction effect, and resistance R 1, R2, R3 play metering function, and optocoupler ic chip 1, IC2, IC3 (its model is 6N137 or 4N25) play signal output buffer action.
After the utility model energized, when phase line L wiring position was correct, optocoupler ic chip 2, IC3 had signal output simultaneously.Phase line L misconnection is when zero line N position, and optocoupler ic chip 1, IC2 have signal output simultaneously.Phase line L misconnection is when the protective ground line position, and optocoupler ic chip 1, IC3 have signal output simultaneously.Optocoupler ic chip 1, IC2, the output of IC3 no signal during phase line L off-line (disconnection).During zero line N off-line (disconnection); circuit forms by resistance R 1, R2; the series circuit that diode D1, D2 and optocoupler ic chip 1, IC2 form is connected between phase line L and the protective ground line E two ends; in this series circuit; the positive-negative polarity of diode D1, D2 is opposite, because the diode unilateral conduction, no current flows through in the series circuit of this formation; optocoupler ic chip 1, the output of IC2 no signal, optocoupler ic chip 3 has signal output.During protective ground line E off-line (disconnection); circuit forms the series circuit of being made up of resistance R 1, R3, diode D1, D3 and optocoupler ic chip 1, IC3 and is connected between phase line L and the zero line N two ends; in this series circuit; the positive-negative polarity of diode D1, D3 is opposite; because diode unilateal conduction characteristic; no current is flowing through in the series circuit of this formation, optocoupler ic chip 1, IC3 no signal output luminotron, and optocoupler ic chip 2 has signal output.
The output of testing circuit of the present utility model or directly connect single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of DLC (digital logic circuit), also can connect the single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of logical circuit, convert corresponding status signal to output signal and show or report to the police testing circuit by control circuit.
Subsequent control circuit of the present utility model can adopt gate circuit to constitute, as shown in Figure 2, it can be made of Sheffer stroke gate IC5A, IC5B, IC5C, IC5D (model can be 4011) and rejection gate IC4A, IC4B, IC4C, IC4D (model can be 4001) and electronic switch IC6 (model can be 4052).The annexation of the utility model and control circuit is as follows, the output terminal of its optocoupler ic chip 1 is respectively with rejection gate IC4A, Sheffer stroke gate IC5D, the input end of IC5B links to each other, the output terminal of optocoupler ic chip 2 is respectively with Sheffer stroke gate IC5A, the input end of rejection gate IC4D and another input end of Sheffer stroke gate IC5B link to each other, the output terminal of optocoupler ic chip 3 is respectively with an input end and the rejection gate IC4A of rejection gate IC4B, another input end of Sheffer stroke gate IC5D links to each other, the output terminal of Sheffer stroke gate IC5D links to each other with another input end of rejection gate IC4D, the output terminal of rejection gate IC4A links to each other with another input end of Sheffer stroke gate IC5A, rejection gate IC4D, the output terminal of Sheffer stroke gate IC5A connects the corresponding input end of rejection gate IC4C respectively, the output terminal of Sheffer stroke gate IC5B links to each other with another input end of rejection gate IC4B, the output terminal of rejection gate IC4B links to each other with the input end of Sheffer stroke gate IC5C, the output terminal of rejection gate IC4C and Sheffer stroke gate IC5C connects the corresponding input end of electronic switch IC6 respectively, the output of IC6 connects the single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of logical circuit, converts corresponding status signal to the output signal with testing circuit and shows or report to the police.
In the electronic switch IC6 of above-mentioned control circuit, its A, B end is the address end of electronic switch, and its X end is the A channel output terminal, and the Y end is the B channel output end.The corresponding relation of testing circuit output level and control circuit output level and phenomenon of the failure sees the following form:
Phenomenon of the failure and testing circuit output level and control circuit output level relation table
| IC1 | IC2 | IC3 | IC4A-3 | IC5D-11 | IC5B-4 | IC5A-3 | IC4D-11 | IC4B-4 | IC4C-10 | IC5C-10 | |
| The ground wire open circuit | L 0 | Hi | L 0 | Hi | Hi | Hi | L 0 | L 0 | Hi | Hi | L 0 |
| Ground is wrong mutually | Hi | L 0 | Hi | L 0 | L 0 | Hi | Hi | Hi | L 0 | L 0 | Hi |
| Zero is wrong mutually mutually | Hi | Hi | L 0 | L 0 | L 0 | L 0 | Hi | Hi | Hi | L 0 | L 0 |
| Normally | L 0 | Hi | Hi | L 0 | Hi | Hi | Hi | L 0 | L 0 | Hi | Hi |
Annotate: L
0Represent low level, Hi represents high level.Above-mentioned duty can be passed through diode displaying, also can show by display.
Claims (2)
1, a kind of electronic measuring instrument electrical safety protective device testing circuit, it is characterized in that it will and be connected across with the series arm that diode phase D1 forms between the ground wire E and zero line N of electronic measuring instrument attaching plug by an input end and the resistance R 1 of optocoupler ic chip 1, to and be connected across with the series arm that diode phase D2 forms between the phase line L and zero line N of electronic measuring instrument attaching plug by an input end and the resistance R 2 of optocoupler ic chip 2, to and be connected across with the series arm that diode phase D3 forms between the phase line L and ground wire E of electronic measuring instrument attaching plug by an input end and the resistance R 3 of optocoupler ic chip 3, optocoupler ic chip 1, IC2, the output of IC3 or directly connect single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of DLC (digital logic circuit), or connect the single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of logical circuit by control circuit, convert corresponding status signal to output signal and show or report to the police testing circuit.
2, electronic measuring instrument electrical safety protective device testing circuit according to claim 1, it is characterized in that its follow-up control circuit is by Sheffer stroke gate IC5A, IC5B, IC5C, IC5D and rejection gate IC4A, IC4B, IC4C, IC4D and electronic switch IC6 constitute, the output terminal of the optocoupler ic chip 1 of testing circuit is respectively with rejection gate IC4A, Sheffer stroke gate IC5D, the input end of IC5B links to each other, the output terminal of optocoupler ic chip 2 is respectively with Sheffer stroke gate IC5A, the input end of rejection gate IC4D and another input end of Sheffer stroke gate IC5B link to each other, the output terminal of optocoupler ic chip 3 is respectively with an input end and the rejection gate IC4A of rejection gate IC4B, another input end of Sheffer stroke gate IC5D links to each other, the output terminal of Sheffer stroke gate IC5D links to each other with another input end of rejection gate IC4D, the output terminal of rejection gate IC4A links to each other with another input end of Sheffer stroke gate IC5A, rejection gate IC4D, the output terminal of Sheffer stroke gate IC5A connects the corresponding input end of rejection gate IC4C respectively, the output terminal of Sheffer stroke gate IC5B links to each other with another input end of rejection gate IC4B, the output terminal of rejection gate IC4B links to each other with the input end of Sheffer stroke gate IC5C, the output terminal of rejection gate IC4C and Sheffer stroke gate IC5C connects the corresponding input end of electronic switch IC6 respectively, the output of IC6 connects the single-chip microcomputer input/output port in the controlled electronic measuring instrument or the input end of logical circuit, converts corresponding status signal to the output signal with testing circuit and shows or report to the police.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025071 CN2679699Y (en) | 2004-03-02 | 2004-03-02 | Detection circuit for electrical safety protector for electronic measurers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025071 CN2679699Y (en) | 2004-03-02 | 2004-03-02 | Detection circuit for electrical safety protector for electronic measurers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2679699Y true CN2679699Y (en) | 2005-02-16 |
Family
ID=34583476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420025071 Expired - Fee Related CN2679699Y (en) | 2004-03-02 | 2004-03-02 | Detection circuit for electrical safety protector for electronic measurers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2679699Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101286632B (en) * | 2007-04-11 | 2010-04-07 | 刘锦泰 | Device to send out alarming indication when abnormal voltage appearing in grounding system |
| CN108233528A (en) * | 2016-12-14 | 2018-06-29 | 华为技术有限公司 | A kind of power input control device |
| CN113866523A (en) * | 2020-06-30 | 2021-12-31 | 芜湖美的厨卫电器制造有限公司 | Electrical phase detection device and method for household appliance and household appliance |
-
2004
- 2004-03-02 CN CN 200420025071 patent/CN2679699Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101286632B (en) * | 2007-04-11 | 2010-04-07 | 刘锦泰 | Device to send out alarming indication when abnormal voltage appearing in grounding system |
| CN108233528A (en) * | 2016-12-14 | 2018-06-29 | 华为技术有限公司 | A kind of power input control device |
| CN108233528B (en) * | 2016-12-14 | 2021-10-01 | 华为技术有限公司 | Power input control device |
| CN113866523A (en) * | 2020-06-30 | 2021-12-31 | 芜湖美的厨卫电器制造有限公司 | Electrical phase detection device and method for household appliance and household appliance |
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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: 20050216 Termination date: 20100302 |