CN2758783Y - Ground wire detector and terminal plate for detecting ground wire condition - Google Patents
Ground wire detector and terminal plate for detecting ground wire condition Download PDFInfo
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- CN2758783Y CN2758783Y CN 200420105905 CN200420105905U CN2758783Y CN 2758783 Y CN2758783 Y CN 2758783Y CN 200420105905 CN200420105905 CN 200420105905 CN 200420105905 U CN200420105905 U CN 200420105905U CN 2758783 Y CN2758783 Y CN 2758783Y
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Abstract
The utility model discloses a ground wire detector, which comprises a DC power supply circuit, a ground wire detection circuit and a display circuit, wherein the DC power supply circuit is used for the output of the DC power supply, the power supply input terminal of the ground wire detection circuit is connected with the output terminal of the DC power supply circuit, the input terminal of the detection signal is used for connecting with a ground wire and a power cord, the power supply input terminal of the display circuit is connected with the output terminal of the DC power supply circuit and the input terminal of the display signal is coupled with the output terminal of the detection signal of the ground wire detection circuit. The utility model also discloses a terminal plate for detecting the ground wire condition, which comprises a terminal plate box body, a ground wire terminal, a live wire terminal and a zero line terminal which are arranged in the terminal plate box body, wherein the inner part of the terminal plate box body also comprises a DC power supply switching circuit, a ground wire detection circuit and a display circuit. The ground wire detection circuit arranged in a ground wire detection device can carry out detection to the conductive capacity between the power cord and the ground wire. When an electric appliance requires the detection that if the ground wire is in good grounding, the reliable state of the grounding of the ground wire can be displayed by the display circuit. The terminal plate for detecting the ground wire condition can remind users that if the electric appliance is in safe operation state.
Description
Technical field
The utility model relates to a kind of ground line detector and a kind of terminal block that detects the ground wire situation.
Background technology
General electronics or electric type commodity all can produce the alternating current magnetic wave of 60HZ extremely low frequency after its energising, claim electromagnetic radiation or low frequency radiation again.Especially computing machine, the electromagnetic radiation of generation has also been contained each section of 60HZ～1000MHZ except that 60HZ.Since computing machine be closely, the long-time electronic product that uses, the influence that human body is caused for the electromagnetic radiation that reduces its generation, computing machine factory adopts electromagnetic screen to isolate, the overlap joint the earth that the user must be correct with computer case for this reason, after making the computer shield device absorb the computing machine radiation, get rid of through chassics earth.Therefore can whether ground connection well will directly have influence on the computer shield device to existing terminal block play a role.
Simultaneously in a lot of places of using ground wire, whether ground wire is reliable with being connected of the earth, often be difficult for being noted by the people, especially in the environment of household and commercial office, owing to detect the technical factor of ground wire, can't be regular, easily, the reliability of ground wire is confirmed, just exist the secret worry that electric leakage is got an electric shock in case imperfect earth escapes detection.
The utility model content
The purpose of this utility model is exactly in order to overcome the deficiencies in the prior art, and a kind of ground line detector and a kind of terminal block that detects the ground wire situation that can detect and show the ground wire grounded situation of terminal block are provided.
The utility model realizes that the above-mentioned purpose scheme is:
A kind of ground line detector comprises: dc power supply circuit, output DC source; Ground wire detects the loop, and its power input connects the output terminal of dc power supply circuit, and the detection signal input end is used for ground wire and power lead; Show circuit, its power input connects the output terminal of dc power supply circuit, and shows signal input end and ground wire detect the detection signal output terminal coupling in loop.
Also comprise control loop, its power input connects the output terminal of dc power supply circuit, and the control signal output ends ground wire detects the signal input end in loop, and state of ground wire input end grounding line detects the detection signal output terminal in loop.
It is on-off circuit that described ground wire detects the loop, and it is ground wire grounded to detect terminal block, and then ground wire detects the loop conducting.
Described ground wire detects the loop and comprises photo-coupler PH1, PH2 and silicon controlled switch SCR, diode cathode ground connection among the photo-coupler PH1, diode cathode among the photo-coupler PH1 connects the control signal output ends of control loop, the collector of the phototriode among the photo-coupler PH1 is used to connect AC power, the emitter of the phototriode among the photo-coupler PH1 connects the control utmost point of silicon controlled switch SCR, the positive pole of silicon controlled switch SCR is used to connect AC power, the negative pole of silicon controlled switch SCR connects the diode cathode among the photo-coupler PH2, diode cathode among the photo-coupler PH2 is used for ground wire, the collector of the phototriode among the photo-coupler PH2 is used to connect the output terminal of dc power supply circuit, and the emitter of the phototriode among the photo-coupler PH2 connects the state of ground wire input end of control loop.
Described control loop comprises chronotron, pulse producer and on-off circuit, the input of described chronotron connects the output terminal of dc power supply circuit, the output of chronotron connects the control end of pulse producer, diode cathode among the output termination photo-coupler PH1 of pulse producer, the emitter of the phototriode among the photo-coupler PH2 connects the on-off circuit input end of control loop, the shows signal input end of the output termination show circuit of this on-off circuit.
Described show circuit comprises light emitting diode LDR, LDB, the positive pole of light emitting diode LDR, LDB connects the output terminal of dc power supply circuit, and the negative pole of light emitting diode LDR, LDB connects the output of ground wire obstacle switch in the on-off circuit of control loop, the output that ground wire contacts good switch respectively.
Further, a kind of terminal block that detects the ground wire situation is proposed, comprise terminal block box body and the ground terminal, live wire end and the zero line side that place terminal block box body inside, also comprise following circuit in the described terminal block box body: direct-current power supply converting circuit, described direct-current power supply converting circuit places in the terminal block box body, this direct-current power supply converting circuit output DC source; Ground wire detects the loop, and its power input connects the output terminal of dc power supply circuit, detection signal input end one termination ground terminal, and the detection signal input end other end links to each other with live wire end or zero line side; Show circuit, its power input connects the output terminal of dc power supply circuit, and shows signal input end and ground wire detect the detection signal output terminal coupling in loop.Also comprise control loop, described control loop comprises chronotron, pulse producer and on-off circuit, the input of described chronotron connects the output terminal of dc power supply circuit, the output of chronotron connects the control end of pulse producer, the output head grounding line of pulse producer detects the signal input end in loop, the on-off circuit input end grounding line of control loop detects the detection signal output terminal in loop, the shows signal input end of the output termination show circuit of this on-off circuit.
Described ground wire detects the loop and comprises photo-coupler PH1, PH2 and silicon controlled switch SCR, diode cathode ground connection among the photo-coupler PH1, diode cathode among the photo-coupler PH1 connects the control signal output ends of control loop, the collector of the phototriode among the photo-coupler PH1 start to exchange fire line end or zero line side, the emitter of the phototriode among the photo-coupler PH1 connects the control utmost point of silicon controlled switch SCR, the positive pole of silicon controlled switch SCR start to exchange fire line end or zero line side, the negative pole of silicon controlled switch SCR connects the diode cathode among the photo-coupler PH2, diode cathode grounding terminal among the photo-coupler PH2, the collector of the phototriode among the photo-coupler PH2 connects the output terminal of dc power supply circuit, and the emitter of the phototriode among the photo-coupler PH2 connects the state of ground wire input end of control loop.
Described show circuit comprises light emitting diode LDR, LDB, the electroluminescent lamp of light emitting diode LDR, LDB places in the terminal block box body upper transparent light shield, the positive pole of light emitting diode LDR, LDB connects the output terminal of dc power supply circuit, and the negative pole of light emitting diode LDR, LDB connects the output of ground wire obstacle switch in the on-off circuit of control loop, the output that ground wire contacts good switch respectively.
Adopt the beneficial effect of above scheme:
1, the detection of the ground wire in line detector loop can be detected the conductive capability between power lead and the ground wire, when electrical equipment need detect ground wire ground connection is good, with the ground connection reliability state of ground wire show by display circuit to remind user's electrical equipment whether to be in safe working condition.
2, the chronotron in the control loop plays the buffered sources electric current, sets suitable delay time, treats whether ground connection is detected to ground wire again after the current stabilization in the terminal block circuit; Pulse producer is used for detecting the loop to ground wire and sends signal, whether ground connection is detected at any time not need ground wire to the terminal block that detects the ground wire situation, detect to ground wire detection loop as long as send pulse in the moment of setting, all the other times need not be detected.The reliability to ground wire that can be regular detects, and when especially terminal block connects computing machine, can judge whether the electromagnetic screen of computing machine works, and greatly improves the security that computing machine uses.
3, adopt photo-coupler to make ground wire and detect the loop, simple in structure, sensitivity is good, and testing result is accurate, and it is low to detect the cost of terminal block of ground wire situation.
Description of drawings
Also in conjunction with the accompanying drawings the utility model is described in further detail below by specific embodiment.
Fig. 1 is a schematic diagram one of the present utility model.
Fig. 2 is the circuit diagram of the utility model embodiment one.
Fig. 3 is the circuit diagram of the utility model embodiment two.
Fig. 4 is a schematic diagram two of the present utility model.
Fig. 5 is the circuit diagram of the utility model embodiment three.
Fig. 6 is the inner structure synoptic diagram of control chip CTC.
Fig. 7 is the synoptic diagram of the utility model terminal block.
Embodiment
Embodiment one, shown in Fig. 1,2,7, a kind of terminal block comprises terminal block box body 5, ground terminal, live wire end and zero line side and places the ground line detector of terminal block box body inside, and the ground line detector comprises that dc power supply circuit 1, ground wire detect loop 2 and show circuit 3.
The principle that designs this terminal block is as follows:
Dc power supply circuit 1, the working current of loop 2 and show circuit 3 is detected so that ground wire to be provided in the output DC source.Can directly adopt the loop in output DC sources such as battery, can be direct supply with the AC power rectification of input also, and what adopt in the present embodiment is that the AC power rectification of importing is the design proposal of direct supply.
Conductive capability between the power lead of the ground wire detection 2 pairs of accesses in loop and the ground wire of access detects, and exports the consequential signal that detects to show circuit 3.
Terminal block box body 5 will entirely line detector be encapsulated in, and a transparent light shield 7 is set in its appearance, be used for the luminous demonstration of lamp of show circuit 3.
The concrete structure of terminal block is as follows:
Dc power supply circuit 1 comprises commissure capacitor C 1, discharge resistance R1, the long-pending diode ZD1 that receives of diode D1, D2, D3, D4 and pressure limiting.Diode D1, D2, D3, D4 form diode bridge rectifier circuit.AC power is imported from contact N, L, through C1 step-down of commissure capacitor and current limliting, the bridge rectifier loop that constitutes via diode D1, D2, D3, D4 is with the alternating voltage step-down and be rectified into the full-wave direct current power supply, this full-wave direct current power supply becomes the direct supply of Xiao Lian ripple again after filter capacitor C2 filtering, at last again through ZD1 stop voltage and voltage stabilizing, in order to supply the ring current of line detector entirely.Dc power supply circuit 1 in the utility model can adopt other common dc power supply circuit 1 to replace.
Ground wire detects loop 2 and comprises diode D5, D6, current-limiting resistance R3, photoelectrical coupler PH2.The positive pole of diode D5, D6 is connecting to neutral line, live wire respectively, the negative pole of diode D5, D6 connects the end of current-limiting resistance R3, diode cathode among another termination photo-coupler PH2 of current-limiting resistance R3, diode cathode ground wire among the photo-coupler PH2, the collector of the phototriode among the photo-coupler PH2 is used to connect the dc power output end of dc power supply circuit 1.
Ground wire detects loop 2 main function that realizes switch in the utility model, therefore can also detect the loop with the ground wire that other on-off circuit is replaced in the present embodiment, only need to realize in case detect terminal block when ground wire grounded ground wire detect just the have an appointment function of 1 milliampere of following current lead-through of loop 2.
The course of work is as follows:
When terminal block is connected with the mains, if power ground point is ground wire grounded good, then the negative pole of diode is a low-voltage among the photo-coupler PH2, zero-power line end N or live wire end L have a 1mA when the power supply positive half-wave electric current is via diode D5 or the diode D6 current-limiting resistance R3 that flows through, flow to ground-side of power G after the emission side of photo-coupler PH2 of flowing through again, the conducting simultaneously of the sensitive side of photo-coupler PH2, electric current flows to light emitting diode LD from the sensitive side of positive source by photo-coupler PH2, light emitting diode LD conducting is luminous, the normal ground connection of indication power supply.
Otherwise: if power ground point G imperfect earth or do not have ground connection, then when terminal block is connected with the mains, the negative pole zero load of diode among the photo-coupler PH2, be high voltage, the not conducting of emission side of photo-coupler PH2, thereby the also not conducting of sensitive side of photo-coupler PH2, the negative pole zero load of light emitting diode LD, light emitting diode LD is not luminous, and the indication power supply does not have normal ground connection.
Embodiment two, as shown in Figure 3, because detecting the detection electric current in loop should not be for a long time greater than 1mA, when electric current during less than 1mA, more difficult driven for emitting lights diode LD is luminous, therefore on the basis of embodiment one, increase in the show circuit 3 and amplify triode Q1, the base stage of amplifying triode Q1 connects the emitter of the phototriode among the photo-coupler PH2, and the emitter that amplifies triode Q1 connects the dc power output end of dc power supply circuit 1, and the collector that amplifies triode Q1 is by resistance R 2 ground connection.
The course of work is as follows:
When terminal block is connected with the mains, if power ground point is ground wire grounded good, then the negative pole of diode is a low-voltage among the photo-coupler PH2, zero-power line end N or live wire end L have a 1mA when the power supply positive half-wave electric current is via diode D5 or the diode D6 current-limiting resistance R3 that flows through, flow to ground-side of power G after the emission side of photo-coupler PH2 of flowing through again, the conducting simultaneously of the sensitive side of photo-coupler PH2, electric current flows to the base stage of amplification triode Q1 by the sensitive side of photo-coupler PH2 from positive source, amplify triode Q1 conducting, after amplification triode Q1 amplifies this electric current, electric current flows to light emitting diode LD from the collector that amplifies triode Q1, light emitting diode LD conducting is luminous, the normal ground connection of indication power supply.
Otherwise: if power ground point G imperfect earth or do not have ground connection, then when terminal block is connected with the mains, the negative pole zero load of diode among the photo-coupler PH2, be high voltage, the not conducting of emission side of photo-coupler PH2, thereby the also not conducting of sensitive side of photo-coupler PH2, the base stage of amplifying triode Q1 does not have electric current, end thereby amplify triode Q1, light emitting diode LD is not luminous, and the indication power supply does not have normal ground connection.
Embodiment three, shown in Fig. 4,5, be with the difference of embodiment one: increased control loop 4,2 pairs of ground wires of its control ground line detection circuit detect, and the testing result signal of reception ground line detection circuit 2, and after internal arithmetic is differentiated, export shows signal, control the demonstration of show circuit 3.
Described control loop 4 comprises chronotron 41, pulse producer 42, on-off circuit 43 and input electronegative potential resistor R 2.Wherein chronotron 41, pulse producer 42 and on-off circuit 43 are integrated by control chip CTC, as shown in Figure 6.01 pin of control chip CTC in the present embodiment is the output pin of ground wire obstacle switch in the on-off circuit 43,02 pin is the output pin that ground wire contacts good switch in the on-off circuit 43,03 pin is the output terminal pin of pulse producer 42, and 11 pins are the input end pin of on-off circuit 43 in the control loop 4.
Accordingly, ground wire detection loop 2 and show circuit 3 have also been done following change: described ground wire detects loop 2 and comprises diode D5, D6, current-limiting resistance R3, R4, photoelectrical coupler PH1, PH2 and silicon controlled switch SCR; Described show circuit 3 comprises light emitting diode LDR, LDB.
The each several part circuit connects as follows:
The input of chronotron 41 connects the output terminal of dc power supply circuit 1 in the control loop 4, the output of chronotron 41 connects the control end of pulse producer 42, diode cathode among the photo-coupler PH1 in the output terminal 03 pin ground wire detection loop 2 of pulse producer 42, diode cathode ground connection among the photo-coupler PH1, the emitter of the phototriode among the photo-coupler PH1 connects the control utmost point of silicon controlled switch SCR, the positive pole of diode D5 meets zero-power line end N, the negative pole of diode D5 connects the positive pole of silicon controlled switch SCR by current-limiting resistance R3, connect the collector of the phototriode among the photo-coupler PH1 by current-limiting resistance R4, the positive pole of diode D6 meets power firestreak end L, the negative pole of diode D6 connects the positive pole of silicon controlled switch SCR by current-limiting resistance R3, connect the collector of the phototriode among the photo-coupler PH1 by current-limiting resistance R4, the negative pole of silicon controlled switch SCR connects the diode cathode among the photoelectrical coupler PH2, the negative pole of the diode among the photoelectrical coupler PH2 meets ground-side of power G, the collector of the phototriode among the photoelectrical coupler PH2 connects the output terminal of dc power supply circuit 1, the emitter of the phototriode among the photoelectrical coupler PH2 connects input end pin one 1 pin of on-off circuit 43 in the control loop 4, by input electronegative potential resistor R 2 ground connection, light emitting diode LDR positive pole in the show circuit 3 connects the output terminal of dc power supply circuit 1, the negative pole of light emitting diode LDR connects output pin 01 pin of ground wire obstacle switch in the on-off circuit 43, light emitting diode LDB positive pole connects the output terminal of dc power supply circuit 1, and light emitting diode LDB negative pole connects output pin 02 pin that ground wire in the on-off circuit 43 contacts good switch.
The course of work is as follows:
When terminal block is connected with the mains, chronotron 41 among the control chip CTC postpones distance when of short duration is sent in several seconds (this time can preestablish) back by 42 output pins 03 of the pulse producer among the control chip CTC noble potential signal, in order to drive photo-coupler PH1, when this moment, if power ground point G had good earth, then zero-power line end N or live wire end L have a Weak current via diode D5 or the diode D6 current-limiting resistance R4 that flows through when the power supply positive half-wave, the flow through sensitive side of the photo-coupler PH1 that opens, and triggering silicon controlled switch SCR, silicon controlled switch SCR conducting after triggering, can have an appointment the electric current of 1-5mA via diode D5 or diode D6 this moment, through resistance R 3, flow through silicon controlled switch SCR, flow to ground-side of power G after the emission side of the photo-coupler PH2 that flows through again.When the electric current of 1-5mA passes through the emission side of photo-coupler PH2, the conducting simultaneously of the sensitive side of photo-coupler PH2, electric current flows to resistor R 2 from the sensitive side of positive source by photo-coupler PH2, making current potential originally is that the input end pin I1 pin current potential of on-off circuit 43 rises to noble potential near power supply among zero the control chip CTC, after control chip CTC obtains the noble potential signal of I1 pin, judge that power ground point is the good earth situation, on-off circuit 43 among the control chip CTC just will be exported 02 pin and open, start the LDB fluorescent tube of display circuit 3, the LDB lamp tube starting colored lights light (can set the glow color of LDB fluorescent tube) that turns blue, the normal ground connection of indication power supply.
Otherwise: if power ground point G imperfect earth or do not have ground connection, then when terminal block is connected with the mains, after postponing the several seconds, chronotron 41 among the control chip CTC sends the noble potential signal of distance when of short duration by 42 output pins 03 of the pulse producer among the control chip CTC, in order to drive photo-coupler PH1, at this moment, zero-power line end N or live wire end L when power supply positive half-wave or negative half-wave, can all not have Weak current via diode D5 or D6 through the flow through sensitive side of the photo-coupler PH1 that opens of current-limiting resistance R4.Silicon controlled switch SCR is not triggered, silicon controlled switch SCR is in not on-state, therefore the emission side of photo-coupler PH2 does not have electric current to pass through, the not conducting simultaneously of the sensitive side of photo-coupler PH2, electric current is blocked by the sensitive side of photo-coupler PH2, making current potential originally is that the input end pin I1 pin current potential of on-off circuit 43 still is in low-potential state among zero the control chip CTC, control chip CTC is the detection ground wire is obtained the electronegative potential signal of I1 pin in the time after, judge that power ground point is bad or does not have the ground connection situation, on-off circuit 43 among the control chip CTC just will be exported 01 pin and open, start the LDR fluorescent tube of display circuit 3, the rubescent chromatic flicker light of LDR lamp tube starting (can be set other glow color, as long as indicating power supply does not have normal ground connection the glow color difference with the LDB fluorescent tube).
Claims (10)
1, a kind of ground line detector is characterized in that, comprising:
Dc power supply circuit (1), the output DC source;
Ground wire detects loop (2), and its power input connects the output terminal of dc power supply circuit (1), and the detection signal input end is used for ground wire and power lead;
Show circuit (3), its power input connects the output terminal of dc power supply circuit (1), and shows signal input end and ground wire detect the detection signal output terminal coupling in loop (3).
2, a kind of ground according to claim 1 line detector, it is characterized in that: also comprise control loop (4), its power input connects the output terminal of dc power supply circuit (1), the control signal output ends ground wire detects the signal input end in loop (3), and state of ground wire input end grounding line detects the detection signal output terminal in loop (3).
3, a kind of ground according to claim 2 line detector is characterized in that: described ground wire detects loop (2) and is on-off circuit, and it is ground wire grounded to detect terminal block, and then ground wire detects loop (2) conducting.
4, a kind of ground according to claim 3 line detector, it is characterized in that: described ground wire detects loop (2) and comprises photo-coupler PH1, PH2 and silicon controlled switch SCR, diode cathode ground connection among the photo-coupler PH1, diode cathode among the photo-coupler PH1 connects the control signal output ends of control loop (4), the collector of the phototriode among the photo-coupler PH1 is used to connect AC power, the emitter of the phototriode among the photo-coupler PH1 connects the control utmost point of silicon controlled switch SCR, the positive pole of silicon controlled switch SCR is used to connect AC power, the negative pole of silicon controlled switch SCR connects the diode cathode among the photo-coupler PH2, diode cathode among the photo-coupler PH2 is used for ground wire, the collector of the phototriode among the photo-coupler PH2 is used to connect the output terminal of dc power supply circuit (1), and the emitter of the phototriode among the photo-coupler PH2 connects the state of ground wire input end of control loop (4).
5, a kind of ground according to claim 4 line detector, it is characterized in that: described control loop (4) comprises chronotron, pulse producer and on-off circuit, the input of described chronotron connects the output terminal of dc power supply circuit (1), the output of chronotron connects the control end of pulse producer, diode cathode among the output termination photo-coupler PH1 of pulse producer, the emitter of the phototriode among the photo-coupler PH2 connects the on-off circuit input end of control loop (4), the shows signal input end of the output termination show circuit (3) of this on-off circuit.
6, a kind of ground according to claim 5 line detector, it is characterized in that: described show circuit (3) comprises light emitting diode LDR, LDB, the positive pole of light emitting diode LDR, LDB connects the output terminal of dc power supply circuit (1), and the negative pole of light emitting diode LDR, LDB connects the output of ground wire obstacle switch in the on-off circuit of control loop (4), the output that ground wire contacts good switch respectively.
7, a kind of terminal block that detects the ground wire situation comprises terminal block box body (5) and places terminal block box body (5) inner ground terminal, live wire end and zero line side, it is characterized in that,
Also comprise following circuit in the described terminal block box body (5):
Direct-current power supply converting circuit (1), described direct-current power supply converting circuit (1) place in the terminal block box body (5), this direct-current power supply converting circuit (1) output DC source;
Ground wire detects loop (2), and its power input connects the output terminal of dc power supply circuit (1), detection signal input end one termination ground terminal, and the detection signal input end other end links to each other with live wire end or zero line side;
Show circuit (3), its power input connects the output terminal of dc power supply circuit (1), and shows signal input end and ground wire detect the detection signal output terminal coupling in loop (3).
8, a kind of terminal block that detects the ground wire situation according to claim 7, it is characterized in that: also comprise control loop (4), described control loop (4) comprises chronotron, pulse producer and on-off circuit, the input of described chronotron connects the output terminal of dc power supply circuit (1), the output of chronotron connects the control end of pulse producer, the output head grounding line of pulse producer detects the signal input end in loop (2), the on-off circuit input end grounding line of control loop (4) detects the detection signal output terminal in loop (3), the shows signal input end of the output termination show circuit (3) of this on-off circuit.
9, a kind of terminal block that detects the ground wire situation according to claim 8, it is characterized in that: described ground wire detects loop (2) and comprises photo-coupler PH1, PH2 and silicon controlled switch SCR, diode cathode ground connection among the photo-coupler PH1, diode cathode among the photo-coupler PH1 connects the control signal output ends of control loop (4), the collector of the phototriode among the photo-coupler PH1 start to exchange fire line end or zero line side, the emitter of the phototriode among the photo-coupler PH1 connects the control utmost point of silicon controlled switch SCR, the positive pole of silicon controlled switch SCR start to exchange fire line end or zero line side, the negative pole of silicon controlled switch SCR connects the diode cathode among the photo-coupler PH2, diode cathode grounding terminal among the photo-coupler PH2, the collector of the phototriode among the photo-coupler PH2 connects the output terminal of dc power supply circuit (1), and the emitter of the phototriode among the photo-coupler PH2 connects the state of ground wire input end of control loop (4).
10, a kind of terminal block that detects the ground wire situation according to claim 9, it is characterized in that: described show circuit (3) comprises light emitting diode LDR, LDB, the electroluminescent lamp of light emitting diode LDR, LDB places in terminal block box body (5) the upper transparent light shield (7), the positive pole of light emitting diode LDR, LDB connects the output terminal of dc power supply circuit (1), and the negative pole of light emitting diode LDR, LDB connects the output of ground wire obstacle switch in the on-off circuit of control loop (4), the output that ground wire contacts good switch respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420105905 CN2758783Y (en) | 2004-12-29 | 2004-12-29 | Ground wire detector and terminal plate for detecting ground wire condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420105905 CN2758783Y (en) | 2004-12-29 | 2004-12-29 | Ground wire detector and terminal plate for detecting ground wire condition |
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| CN2758783Y true CN2758783Y (en) | 2006-02-15 |
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| CN 200420105905 Expired - Fee Related CN2758783Y (en) | 2004-12-29 | 2004-12-29 | Ground wire detector and terminal plate for detecting ground wire condition |
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| CN101334442B (en) * | 2008-07-29 | 2010-06-23 | 深圳和而泰智能控制股份有限公司 | Earth wire detector |
| CN103839463A (en) * | 2012-11-23 | 2014-06-04 | 宁波电业局 | Simulation transformer lead detection method and system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101334442B (en) * | 2008-07-29 | 2010-06-23 | 深圳和而泰智能控制股份有限公司 | Earth wire detector |
| CN103839463A (en) * | 2012-11-23 | 2014-06-04 | 宁波电业局 | Simulation transformer lead detection method and system |
| CN104749455A (en) * | 2013-12-31 | 2015-07-01 | 林开兵 | Circuit or electric appliance detecting/monitoring device |
| CN104749455B (en) * | 2013-12-31 | 2017-08-11 | 林开兵 | A kind of circuit or Electrical Testing, monitoring device |
| CN106383312A (en) * | 2016-12-01 | 2017-02-08 | 北京简佑科技有限公司 | Motor state detection circuit and motor state display device |
| CN106383312B (en) * | 2016-12-01 | 2023-06-27 | 北京简佑科技有限公司 | Motor state detection circuit and motor state display device |
| CN107462804A (en) * | 2017-09-26 | 2017-12-12 | 捍防（苏州）实业有限公司 | A kind of Electrical Safety analytical equipment |
| CN107462804B (en) * | 2017-09-26 | 2020-05-26 | 捍防（苏州）实业有限公司 | Electricity safety analysis device |
| CN110235005A (en) * | 2017-12-19 | 2019-09-13 | 马鞍山市明珠电子科技有限公司 | Electrical equipment and the method for detecting electrical appliance ground state |
| CN108224790A (en) * | 2018-04-04 | 2018-06-29 | 广东格美淇电器有限公司 | Earth wire charged testing device and a kind of electric heater |
| CN108224790B (en) * | 2018-04-04 | 2024-04-30 | 广东格美淇电器有限公司 | Ground wire live detection device and electric water heater |
| CN109031027A (en) * | 2018-08-31 | 2018-12-18 | 江西洪都航空工业集团有限责任公司 | A kind of ground state is shorted the test method of route |
| CN110146769A (en) * | 2019-05-10 | 2019-08-20 | 深圳微步信息股份有限公司 | A kind of grounding wire monitoring device, EOS monitor system and method |
| CN113466745A (en) * | 2020-03-31 | 2021-10-01 | 华为技术有限公司 | Transmission apparatus and data transmission method |
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