CN202167827U - Safe quick-break type leakage protector - Google Patents
Safe quick-break type leakage protector Download PDFInfo
- Publication number
- CN202167827U CN202167827U CN2011202871992U CN201120287199U CN202167827U CN 202167827 U CN202167827 U CN 202167827U CN 2011202871992 U CN2011202871992 U CN 2011202871992U CN 201120287199 U CN201120287199 U CN 201120287199U CN 202167827 U CN202167827 U CN 202167827U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- test
- break type
- protective device
- 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
Links
Images
Landscapes
- Breakers (AREA)
Abstract
The utility model relates to a safe quick-break type leakage protector which comprises a power supply circuit, a sampling circuit, a main control circuit, a pair of single-pole single-throw switches, a make and break mechanism control circuit and a testing circuit. Power is provided for the safe quick-break type leakage protector through the power supply circuit; the sampling circuit collects and outputs leakage current signals between a live wire and a zero line; the main control circuit receives the leakage current signals output by the sampling circuit and performs amplification process on the leakage current signals, and when leakage current reaches a predetermined value, the main control circuit outputs grounding failure control signals; the make and break mechanism control circuit controls the single-pole single-throw switches to break the connection between load and an external power supply according to the grounding failure control signals, so that the purpose of load protection is achieved, and the safety of leakage protection of electric appliances is improved; and simultaneously, an analog failure current signal is provided for the sampling circuit through the testing circuit, so as to test whether the operation of the safe quick-break type leakage protector is normal, and the operation effectiveness of the safe quick-break type leakage protector is improved.
Description
Technical field
The utility model relates to the electric equipment products technical field, relates in particular to a kind of safe quick-break type earth leakage protective device.
Background technology
In real life; Short circuit between energized conductor in the electric equipment products electric loop---zero line and live wire, the earth, electric equipment shell and various grounded metal pipeline or other conductors; All earthing failure possibly take place when perhaps conductor insulation against ground resistance is less than setting, earthing failure can cause overcurrent, thereby can cause fire or risk of shock; For fear of this risk, a kind of leakage protecting plug that prevents earthing failure is by utilization widely.
This leakage protecting plug is installed between power supply and the load, and its effect is to judge the risk of answering electrical appliance whether to have electric leakage through the potential difference that detects between phase line and the zero line.Have the electric leakage situation in the circuit in case detect, tripping operation immediately, cut off the electricity supply with load between be connected, to avoid because electric leakage causes the risk of fire or electric shock.
Existing earthing failure leakage protecting plug has a variety of, mostly forms by being encapsulated in a circuit for detecting in the square shell, a governor circuit, an on off mechanism control circuit, a power circuit and a testing circuit.Its operation principle is, when in pressing on off mechanism, resetting knob, if load end is normal; Circuit for detecting, governor circuit, on off mechanism control circuit, power circuit, testing circuit all get into operating state; At this moment, circuit for detecting is detected less than the leakage current situation, and governor circuit is not given the energising of on off mechanism control circuit; The on off mechanism control circuit is its disconnect of closure all the time, the load operate as normal.In the course of the work; In case detecting between phase line and the zero line, circuit for detecting has potential difference; Earthing failure signal of circuit for detecting output is given governor circuit, and governor circuit is to this signal processing and amplifying and make the energising of on off mechanism control circuit in addition, thereby causes that on off mechanism breaks off its disconnect; Cut off the electricity supply and load between electric current, prevent because electric leakage causes fire or risk of shock to reach.
When there was leakage current in load end, though existing leakage protecting plug being connected of deenergization and load well, error rate was usually than higher, and the tripping that some should not break-make often takes place; Simultaneously, existing leakage protecting plug properties of product are unstable, often have abnormal sound, overheated until the phenomenon of burning plug.
The utility model content
The main purpose of the utility model is to provide a kind of safe quick-break type earth leakage protective device, is intended to strengthen the earth leakage protective fail safe of electric equipment products.
In order to achieve the above object, the utility model proposes a kind of safe quick-break type earth leakage protective device, comprising:
Power circuit is used to said safe quick-break type earth leakage protective device power supply is provided;
Sample circuit is connected between the live wire and zero line of external power source input, is used to gather leakage current signal and output between live wire and the zero line;
Governor circuit is used to receive the leakage current signal that said sample circuit is exported, and said leakage current signal is carried out processing and amplifying, when leakage current reaches predetermined value, and output earthing failure control signal;
A pair of single-pole single-throw switch (SPST) is serially connected in respectively on the input of said external power source and the live wire and zero line between the said sample circuit;
The on off mechanism control circuit is used to receive the earthing failure control signal that said governor circuit is exported; And control being connected of said single-pole single-throw switch (SPST) disconnecting consumers and said external power source according to said earthing failure control signal;
Test circuit is connected with said sample circuit, is used to said sample circuit a simulation inefficacy current signal is provided, and whether test the work of said safe quick-break type earth leakage protective device normal.
Preferably, said sample circuit comprises: current transformer, sampling capacitance, first filter capacitor and current/voltage transfer resistance; Said live wire and zero line pass respectively or are surrounded on the current transformer, and this current transformer first end connects test circuit; Second end is connected with governor circuit through sampling capacitance; One end of first filter capacitor is connected other end ground connection with a line end of current transformer second end; The current/voltage transfer resistance is connected in parallel between two line ends of current transformer second end.
Preferably, said sample circuit also comprises current-limiting resistance, and said current-limiting resistance is connected between said first filter capacitor and the said governor circuit.
Preferably, said governor circuit comprises: chip, feedback circuit, second filter capacitor and driving reverse-voltage protection resistance, and the input of said chip connects said sample circuit and power circuit; The output of said chip connects said on off mechanism control circuit; Said feedback circuit is connected between the input and output of said chip; The output of one chip termination of second filter capacitor, other end ground connection; Said driving reverse-voltage protection resistance string is connected between the output and said on off mechanism control circuit of said chip.
Preferably, said on off mechanism control circuit comprises controllable silicon, first piezo-resistance and coil, and said silicon controlled anode is connected with power circuit, minus earth, and gate pole is connected with the driving reverse-voltage protection resistance of said governor circuit; First piezo-resistance is connected in parallel between said silicon controlled anode and the negative electrode; Coil one end is connected with power circuit, the other end line of starting to exchange fire.
Preferably, said governor circuit also comprises the sampling filter capacitor, is connected between the input and said sample circuit of said chip.
Preferably; Said power circuit comprises: diode, the 3rd filter capacitor, regulating resistor and rectifier bridge heap; Wherein, the negative pole of said diode is connected with the output of said chip, and the positive pole of this diode is connected with the silicon controlled anode with said regulating resistor series connection back; The dc output end of rectifier bridge heap is anodal to be connected with said silicon controlled anode; The dc output end minus earth of rectifier bridge heap; The ac input end of rectifier bridge heap is connected with power supply, and the interchange that this rectifier bridge heap will be accepted converts direct current into and offers said on off mechanism control circuit.
Preferably, said power circuit comprises: two voltage drop resistance, and said two voltage drop resistance series connection back one end connects the output of said chip, and the other end is connected with coil with the silicon controlled anode respectively.
Preferably, said test circuit comprises: test resistance and Test Switchboard, said Test Switchboard be connected between zero line and the live wire after said test resistance is connected; Said test resistance is formed in parallel by the identical current-limiting resistance of some resistances.
Preferably, said test circuit comprises: test resistance, Test Switchboard and second piezo-resistance are connected first end of said current transformer after said test resistance, Test Switchboard and the series connection of second piezo-resistance.
A kind of safe quick-break type earth leakage protective device that the utility model proposes is that safe quick-break type earth leakage protective device provides power supply through power circuit; Sample circuit is gathered leakage current signal and the output between live wire and the zero line; Governor circuit receives the leakage current signal of sample circuit output, and the leakage current signal is carried out processing and amplifying, when leakage current reaches predetermined value, and output earthing failure control signal; The on off mechanism control circuit receives the earthing failure control signal of governor circuit output; And, reach the purpose of protection load, the earth leakage protective fail safe of raising electric equipment products according to being connected of earthing failure control signal control single-pole single-throw switch (SPST) disconnecting consumers and external power source; Simultaneously, the utility model is that sample circuit provides a simulation inefficacy current signal through test circuit, and whether the work of test safety quick-break type earth leakage protective device is normal, improved the work validity of safe quick-break type earth leakage protective device; In addition; The utility model on-off switch is that single-pole single-throw switch (SPST) designs at power end, makes load and power supply branch have no progeny, and safe quick-break type earth leakage protective device is no longer charged; Avoided practical power and load to break off; But the circuit of power end is still in running order, the risk that causes electronic devices and components to damage thus, and to the harm that causes the secondary electric leakage; In sample circuit, adopt IV conversion steady resistance, current conversion is become voltage, make sampled signal more reliable and more stable; Output at chip is designed with a driving reverse-voltage protection resistance, prevents that reverse voltage from impacting chip, silicon controlled, thereby greatly reduces chip, silicon controlled failure rate, has improved the stability of entire product; In sample circuit, test circuit, all implant the filtering capacitor of anti-clutter influence, can filter out the influence of clutter to product well, the antijamming capability of product is strengthened greatly, performance improves greatly; And the utility model product function is clear, compact conformation, maintenance are simple and convenient.
Description of drawings
Fig. 1 is the structural representation of the utility model safety quick-break type earth leakage protective device first embodiment;
Fig. 2 is the structural representation of the utility model safety quick-break type earth leakage protective device second embodiment.
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Please shine shown in Figure 1ly, Fig. 1 is the structural representation of the utility model safety quick-break type earth leakage protective device first embodiment.
The utility model first embodiment proposes a kind of safe quick-break type earth leakage protective device, comprising: power circuit 14, sample circuit 11, governor circuit 12, a pair of single-pole single-throw switch (SPST) K12, K13, on off mechanism control circuit 13 and test circuit 15; Wherein:
A pair of single-pole single-throw switch (SPST) K12, K13 are serially connected in respectively on the input of external power source and the live wire L and zero line N between the sample circuit 11;
On off mechanism control circuit 13 is used to receive the earthing failure control signal that governor circuit 12 is exported; And be connected with external power source according to earthing failure control signal control single-pole single-throw switch (SPST) K12, K13 disconnecting consumers;
Particularly, in the present embodiment, sample circuit 11 comprises: current transformer ZCT, sampling capacitance C1, current-limiting resistance R6, the first filter capacitor C4 and current/voltage transfer resistance R3 that ultracrystallite or permalloy are processed; Live wire L and zero line N pass respectively or are surrounded on the current transformer ZCT.Current transformer ZCT has first end and second end that is made up of coil windings, and first end connects test circuit 15; Second end is connected with governor circuit 12 through sampling capacitance C1 and current-limiting resistance R6; The end of sampling capacitance C1 is connected with the second line end LX2 of second end of current transformer ZCT, is connected with governor circuit 12 behind the other end series limiting resistor R6 of sampling capacitance C1.
The end of the first filter capacitor C4 is connected with the first line end LX1 of second end of current transformer ZCT, and the other end is connected with governor circuit 12; Current/voltage transfer resistance R3 is connected in parallel between the two line end LX1, LX2 of second end of current transformer ZCT.
Whether sample circuit 11 is used for the constantly detecting live wire L that flows through and equates with electric current between zero line N, and immediately the leakage current signal that collects is passed to governor circuit 12.
Phase line L and zero line N pass or are around on the current transformer ZCT; And possible uneven leakage current is provided; Current transformer ZCT then responds to possible uneven leakage current; And convert the leakage current of sensing into voltage through current/voltage transfer resistance R3, again through behind the straight-through sampling capacitance C1 that hands over, current-limiting resistance R6, feeding back to governor circuit 12.
The effect of sampling capacitance C1 is the leakage current signal that coupling obtains from current transformer ZCT, and this leakage current signal is passed to the chip U1 in the governor circuit 12.The effect of threshold currents resistance R 6 is the clutters that filter out from the leakage current signal of sampling sampling capacitance C1, makes the whole signal stabilization that samples reliable.
Particularly, present embodiment chips U1 comprises 1,2,3,4,6 and three output of five input PIN pin PIN pin 5,7,8, wherein, and the current-limiting resistance R6 that the first input PIN pin 1 connects in the sample circuit 11; The second input PIN pin is put sky; The 3rd input PIN pin 3 connects the first line end LX1 of second end of current transformer ZCT; The 4th input PIN pin 4 ground connection; The first output PIN pin 5 is connected with on off mechanism control circuit 13 through driving reverse-voltage protection resistance R 5; The 5th input PIN pin 6 connects power circuit 14; Be connected after feedback resistance and 5 parallel connections of feedback filtering capacitor C between the second output PIN pin 7 and the first input PIN pin 1; The 3rd output PIN pin 8 is put sky; Two capacitor C 6 of sampling filter capacitor, C7 be connected in parallel on first and third input PIN pin 1 respectively, between 3 and third and fourth input PIN pin 3, between 4; The end of the second filter capacitor C2 is connected other end ground connection with the first output PIN pin 5.
Feedback circuit is made up of with feedback filtering capacitor C 5 feedback resistance R4, and this feedback circuit also is a gain circuitry, through the sensitivity of the laggard step joint input signal that gains.And the effect that drives reverse-voltage protection resistance R 5 is to prevent the impact of reverse voltage to chip U1; The second filtering electrical equipment C2 is used for filtering the clutter that flows to controllable silicon SCR in the on off mechanism control circuit 13, and the protection controllable silicon SCR does not receive the influence of clutter.
On off mechanism control circuit 13 comprises controllable silicon SCR, the first piezo-resistance ZR1 and coil RYX, and the anode of controllable silicon SCR is connected with power circuit 14, minus earth, and gate pole is connected with the driving reverse-voltage protection resistance R 5 of governor circuit 12; The first piezo-resistance ZR1 is connected in parallel between the anode and negative electrode of controllable silicon SCR; Coil RYX one end is connected with power circuit 14, the other end line L that starts to exchange fire.
On off mechanism control circuit 13 is used for controlling the break-make of single-pole single-throw switch (SPST) K12, K13 and then the break-make between control power supply and the load.
Controllable silicon SCR links to each other with coil RYX and sample circuit 11; Sample circuit 11 is under situation that does not detect leakage current or the situation of leakage current less than certain predetermined value; Chip U1 passes on control signal to give controllable silicon SCR through its first output PIN pin 5; Let controllable silicon SCR keep the off-position to coil RYX, in such cases, safe quick-break type earth leakage protective device is in connects load and power supply status; In case and chip U1 finds that the leakage current value that sample circuit 11 detects has reached under the situation of certain predetermined value; Chip U1 indicates controllable silicon SCR that coil RYX is switched on immediately; After the coil RYX energising, it will produce enough big magnetic force, through the electromagnetic action principle; Force on off mechanism control circuit 13 control single-pole single-throw switch (SPST) K12, K13 deenergization to be connected the purpose that reaches fire preventing or shocked by electricity with load.
Wherein, the first piezo-resistance ZR1 and controllable silicon SCR are connected in parallel, and mainly are used for preventing the impact of reverse voltage to controllable silicon SCR, make the performance of controllable silicon SCR more reliable and more stable.
Wherein, the 3rd filter capacitor C3 is used for filtering out the pulsating voltage to coil RYX; Regulating resistor R2 is used for the voltage in the regulating circuit, prevent the impact of reverse voltage to chip U1, and diode D5 is used for preventing the influence of surge voltage to coil RYX.The effect of bridge heap D1-D4 is to convert AC power supplies on off mechanism control circuit 13 needed DC power supplys.
When pressing K switch 11, its effect is equivalent to trigger test circuit 15 and produces an earthing failure electric current, and it is disconnected with this on off mechanism control circuit 13 control single-pole single-throw switch (SPST) K12, K13 to be jumped, and reaches the purpose of connecting between deenergization and the load.
Wherein, Test resistance R1 belongs to a current-limiting resistance, the inefficacy current signal of a simulation is provided by this test resistance R1 in test circuit 15, and piezo-resistance ZR1 and test resistance R1 is cascaded; Play the effect of filtering the electrical network clutter, avoid test circuit 15 malfunctioning or unusual fluctuations.
In the present embodiment; Single-pole single-throw switch (SPST) K12, K13 are arranged on power end; Single-pole single-throw switch (SPST) K12 and K13 lay respectively on live wire L and the zero line N, are controlling being connected between power supply and the load, in other embodiments; Single-pole single-throw switch (SPST) K12, K13 also can be arranged on load end, and between load and power supply.
Under normal circumstances, single-pole single-throw switch (SPST) K12 and K13 are in normally off; When sample circuit 11 had detected leakage current, coil RYX energising produced enough big magnetic force; Through the electromagnetic action principle; Force single-pole single-throw switch (SPST) K12, K13 deenergization to be connected with load, in case after the outage, need be through Reclosable just after manually pushing.
Present embodiment is arranged at power end with single-pole single-throw switch (SPST) K12 and K13; In case its advantage is outage; Be positioned at all dead electricity immediately of sample circuit 11 after the single-pole single-throw switch (SPST) K12, K13, governor circuit 12, on off mechanism control circuit 13, power circuit 14, test circuit 15, compare with the design philosophy that single-pole single-throw switch (SPST) K12, K13 is arranged in load end, present embodiment has not only been saved the energy; But also avoided practical power and load to break off; But the control circuit of power end is still in running order, very likely damages electronic devices and components, and to the harm that causes the secondary electric leakage.
Under the normal condition; Live wire L equates with electric current between zero line N; Through present embodiment safety quick-break type earth leakage protective device, whether the electric current between detecting live wire L and zero line N there are differences, in case when finding that between the two difference between current is above certain predetermined value; Being connected of deenergization and load immediately then, the risk that reaches fire preventing or shocked by electricity.
As shown in Figure 2, Fig. 2 is the structural representation of the utility model safety quick-break type earth leakage protective device second embodiment.
A kind of safe quick-break type earth leakage protective device that present embodiment proposes; Based on the FM2140 chip design; With above-mentioned first embodiment in like manner; Present embodiment safety quick-break type earth leakage protective device also includes a sample circuit 21, governor circuit 22,23, one power circuit of on off mechanism control circuit 24, a test circuit 25 and a pair of single-pole single-throw switch (SPST) K22, K23.In case detect the earthing failure condition, safe quick-break type earth leakage protective device blocks the electric current among live wire L and the zero line N immediately, and deenergization is connected with load, the risk that reaches fire preventing or shocked by electricity.
Wherein, sample circuit 21 is made up of the current/voltage transfer resistance R2` of sampling capacitance C1`, filter capacitor C3` and the same with sample circuit 11 a current transformer ZCT who is processed by ultracrystallite or permalloy, the two line end LX1 that are connected on current transformer ZCT second end, LX2.Sampling capacitance C1` is used for coupled signal and arrives AC signal before the governor circuit 22 chip U1`, that produced by current transformer ZCT; Filter capacitor C3` then is used for filtering out signal and arrives chip U1` noise signal before.The difference of sample circuit 21 and sample circuit 11 is to have lacked a filter resistance in the sample circuit 21 of present embodiment, and its reason is that the chip U1` that present embodiment governor circuit 22 adopts is different.
The chip U1` that governor circuit 22 is FM2140 by a model, the feedback resistance R1` that value is 100K-470K; The driving reverse-voltage protection resistance R 3` that value is 1K; And a timing capacitor C2` and a filter capacitor C4` composition, feedback resistance R1` and timing capacitor C2` constitute the feedback circuit of present embodiment governor circuit 22.
Compare with the foregoing description; Present embodiment chip U1` comprises 1,2,3,4,5,6 and two output of six input PIN pin PIN pin 7,8; Wherein, feedback resistance R1` exports between the PIN pin 8 with second with the first input PIN pin 1 that is connected chip U1` after timing capacitor C2` connects in the feedback circuit; The second input PIN pin is connected with sampling capacitance C1` in the sample circuit 21, the 3rd import second end of current transformer in PIN pin 3 and the sample circuit the second line end LX2 be connected; The 4th input PIN pin 4 is connected with filter capacitor C3` in the sample circuit.The 5th input PIN pin 5 is connected with power circuit 24, the 6th input PIN pin 6 connecting to neutral lines, and the first output PIN pin 7 is connected with on off mechanism control circuit 23 through driving reverse-voltage protection resistance R 3`.
Feedback resistance R1` is used for eliminating minimum earthing failure condition threshold values, if do not eliminate, this threshold values will be given on off mechanism control circuit 23 through the first output PIN pin, the 7 transmission earthing failure signals of chip U1` by error; It is the same with resistance R 5 in the governor circuit 12 to drive reverse-voltage protection resistance R 3`, also is to be used for preventing the impact of reverse voltage to chip U1`, and timing capacitor C2` then is used for measuring minimum earthing failure condition setting with feedback resistance R1.
Filter capacitor C4` is used for filtering the clutter that flows to controllable silicon SCR in the on off mechanism control circuit 23, and the protection controllable silicon SCR does not receive the influence of clutter.
In the present embodiment on off mechanism control circuit 23 by with on off mechanism control circuit 13 in the same controllable silicon SCR, piezo-resistance ZR1 and coil RYX form, the action and function of each parts is the same, is not described further at this.
Compare with the power circuit 14 among above-mentioned first embodiment, present embodiment power circuit 24 has been simplified a lot, can realize that this simplification is because the chip that both adopt is different.
Identical and resistance R 6, R7 and a Test Switchboard K21 that be connected in parallel form test circuit 25 by two numerical value in the present embodiment, and resistance R 6, R7 constitute test resistance, Test Switchboard K21 be connected between zero line and the live wire after test resistance is connected.
Test resistance R1 in present embodiment test resistance, Test Switchboard K21 and the test circuit 15 and the effect of Test Switchboard K11 are the same, and test circuit 25 is with the difference part of test circuit 15: lacked a piezo-resistance ZR1 in the present embodiment in the test circuit 25.Wherein, the identical resistance of resistance that constitutes test resistance can be set for a plurality of as required.
Identical with above-mentioned first embodiment; A pair of single-pole single-throw switch (SPST) K22 in the present embodiment, K23 also are arranged on power end; When sample circuit detects the earthing failure electric current above certain predetermined value; By the on off mechanism control circuit control a pair of single-pole single-throw switch (SPST) K22, the quick deenergization of K23 is connected with load, reaches the risk of fire preventing or electric shock.
Through relatively knowing; The functional module of above-mentioned two embodiment safety quick-break type earth leakage protective devices is all the same; All comprise sample circuit, governor circuit, on off mechanism control circuit, power circuit, test circuit and a pair of single-pole single-throw switch (SPST); Owing to adopted the Different control chip, the second embodiment safety quick-break type earth leakage protective device structure is simpler relatively on concrete the realization.
In sum, the utility model safety quick-break type earth leakage protective device embodiment is that safe quick-break type earth leakage protective device provides power supply through power circuit; Sample circuit is gathered leakage current signal and the output between live wire and the zero line; Governor circuit receives the leakage current signal of sample circuit output, and the leakage current signal is carried out processing and amplifying, when leakage current reaches predetermined value, and output earthing failure control signal; The on off mechanism control circuit receives the earthing failure control signal of governor circuit output; And, reach the purpose of protection load, the earth leakage protective fail safe of raising electric equipment products according to being connected of earthing failure control signal control single-pole single-throw switch (SPST) disconnecting consumers and external power source; Simultaneously, the utility model is that sample circuit provides a simulation inefficacy current signal through test circuit, and whether the work of test safety quick-break type earth leakage protective device is normal, improved the work validity of safe quick-break type earth leakage protective device; In addition; The utility model on-off switch is that single-pole single-throw switch (SPST) designs at power end, makes load and power supply branch have no progeny, and safe quick-break type earth leakage protective device is no longer charged; Avoided practical power and load to break off; But the circuit of power end is still in running order, the risk that causes electronic devices and components to damage thus, and to the harm that causes the secondary electric leakage; In sample circuit, adopt IV conversion steady resistance, current conversion is become voltage, make sampled signal more reliable and more stable; Output at chip is designed with a driving reverse-voltage protection resistance, prevents that reverse voltage from impacting chip, silicon controlled, thereby greatly reduces control chip, silicon controlled failure rate, has improved the stability of entire product; In sample circuit, test circuit, all implant the filtering capacitor of anti-clutter influence, can filter out the influence of clutter to product well, the antijamming capability of product is strengthened greatly, performance improves greatly.
Simultaneously single-pole single-throw switch (SPST) is arranged on the live wire and zero line of power end, under normal circumstances is in normally off,, cut off the risk that the electric current in the electric wire comes fire preventing or shocked by electricity between connection power supply and load immediately in case find to exist the earthing failure situation; And because switch is designed in power end; Not charged in the switch branch The whole control system of having no progeny, thus avoided practical power and load to break off, and the circuit of power end is still in running order; The risk that causes electronic devices and components to damage thus, and to the harm that causes the secondary electric leakage.And the utility model product function is clear, compact conformation, maintenance are simple and convenient.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical field, all in like manner be included in the scope of patent protection of the utility model.
Claims (10)
1. a safe quick-break type earth leakage protective device is characterized in that, comprising:
Power circuit is used to said safe quick-break type earth leakage protective device power supply is provided;
Sample circuit is connected between the live wire and zero line of external power source input, is used to gather leakage current signal and output between live wire and the zero line;
Governor circuit is used to receive the leakage current signal that said sample circuit is exported, and said leakage current signal is carried out processing and amplifying, when leakage current reaches predetermined value, and output earthing failure control signal;
A pair of single-pole single-throw switch (SPST) is serially connected in respectively on the input of said external power source and the live wire and zero line between the said sample circuit;
The on off mechanism control circuit is used to receive the earthing failure control signal that said governor circuit is exported; And control being connected of said single-pole single-throw switch (SPST) disconnecting consumers and said external power source according to said earthing failure control signal;
Test circuit is connected with said sample circuit, is used to said sample circuit a simulation inefficacy current signal is provided, and whether test the work of said safe quick-break type earth leakage protective device normal.
2. safe quick-break type earth leakage protective device according to claim 1 is characterized in that said sample circuit comprises: current transformer, sampling capacitance, first filter capacitor and current/voltage transfer resistance; Said live wire and zero line pass respectively or are surrounded on the current transformer, and this current transformer first end connects test circuit; Second end is connected with governor circuit through sampling capacitance; One end of first filter capacitor is connected other end ground connection with a line end of current transformer second end; The current/voltage transfer resistance is connected in parallel between two line ends of current transformer second end.
3. safe quick-break type earth leakage protective device according to claim 2 is characterized in that said sample circuit also comprises current-limiting resistance, and said current-limiting resistance is connected between said first filter capacitor and the said governor circuit.
4. according to claim 2 or 3 described safe quick-break type earth leakage protective devices; It is characterized in that; Said governor circuit comprises: chip, feedback circuit, second filter capacitor and driving reverse-voltage protection resistance, and the input of said chip connects said sample circuit and power circuit; The output of said chip connects said on off mechanism control circuit; Said feedback circuit is connected between the input and output of said chip; The output of one chip termination of second filter capacitor, other end ground connection; Said driving reverse-voltage protection resistance string is connected between the output and said on off mechanism control circuit of said chip.
5. safe quick-break type earth leakage protective device according to claim 4; It is characterized in that; Said on off mechanism control circuit comprises controllable silicon, first piezo-resistance and coil; Said silicon controlled anode is connected with power circuit, minus earth, and gate pole is connected with the driving reverse-voltage protection resistance of said governor circuit; First piezo-resistance is connected in parallel between said silicon controlled anode and the negative electrode; Coil one end is connected with power circuit, the other end line of starting to exchange fire.
6. safe quick-break type earth leakage protective device according to claim 5 is characterized in that said governor circuit also comprises the sampling filter capacitor, is connected between the input and said sample circuit of said chip.
7. safe quick-break type earth leakage protective device according to claim 6; It is characterized in that; Said power circuit comprises: diode, the 3rd filter capacitor, regulating resistor and rectifier bridge heap; Wherein, the negative pole of said diode is connected with the output of said chip, and the positive pole of this diode is connected with the silicon controlled anode with said regulating resistor series connection back; The dc output end of rectifier bridge heap is anodal to be connected with said silicon controlled anode; The dc output end minus earth of rectifier bridge heap; The ac input end of rectifier bridge heap is connected with power supply, and the interchange that this rectifier bridge heap will be accepted converts direct current into and offers said on off mechanism control circuit.
8. safe quick-break type earth leakage protective device according to claim 5; It is characterized in that; Said power circuit comprises: two voltage drop resistance, and said two voltage drop resistance series connection back one end connects the output of said chip, and the other end is connected with coil with the silicon controlled anode respectively.
9. safe quick-break type earth leakage protective device according to claim 8 is characterized in that said test circuit comprises: test resistance and Test Switchboard, said Test Switchboard be connected between zero line and the live wire after said test resistance is connected; Said test resistance is formed in parallel by the identical current-limiting resistance of some resistances.
10. safe quick-break type earth leakage protective device according to claim 7; It is characterized in that; Said test circuit comprises: test resistance, Test Switchboard and second piezo-resistance are connected first end of said current transformer after said test resistance, Test Switchboard and the series connection of second piezo-resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202871992U CN202167827U (en) | 2011-08-09 | 2011-08-09 | Safe quick-break type leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202871992U CN202167827U (en) | 2011-08-09 | 2011-08-09 | Safe quick-break type leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202167827U true CN202167827U (en) | 2012-03-14 |
Family
ID=45803631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202871992U Expired - Fee Related CN202167827U (en) | 2011-08-09 | 2011-08-09 | Safe quick-break type leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202167827U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548870A (en) * | 2012-07-27 | 2016-05-04 | 胡小青 | Test equipment having phase generation circuit and used for testing electric leakage breaker |
| CN109085417A (en) * | 2018-08-16 | 2018-12-25 | 珠海英搏尔电气股份有限公司 | The current detection circuit and electric machine controller of direct measuring type Hall sensor |
| CN109119965A (en) * | 2018-09-19 | 2019-01-01 | 湖南小快智造电子科技有限公司 | Safety utilization of electric power device |
| CN109245040A (en) * | 2018-09-30 | 2019-01-18 | 德力西电气有限公司 | leakage protection circuit |
| CN110277763A (en) * | 2019-07-08 | 2019-09-24 | 上海磊跃自动化设备有限公司 | A kind of earth leakage protective device with low current trial jump function |
| CN112373307A (en) * | 2020-11-18 | 2021-02-19 | 北京现代汽车有限公司 | Charging protection method and system and vehicle |
| CN112798981A (en) * | 2020-12-29 | 2021-05-14 | 江苏航天大为科技股份有限公司 | Road traffic system with alternating current monitoring and protecting functions |
| CN112968418A (en) * | 2021-03-02 | 2021-06-15 | 四川长虹空调有限公司 | Electric blanket safety protection controller and method |
| CN113193538A (en) * | 2021-06-11 | 2021-07-30 | 林蔓琦 | Bidirectional leakage protector |
-
2011
- 2011-08-09 CN CN2011202871992U patent/CN202167827U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548870A (en) * | 2012-07-27 | 2016-05-04 | 胡小青 | Test equipment having phase generation circuit and used for testing electric leakage breaker |
| CN109085417A (en) * | 2018-08-16 | 2018-12-25 | 珠海英搏尔电气股份有限公司 | The current detection circuit and electric machine controller of direct measuring type Hall sensor |
| CN109119965A (en) * | 2018-09-19 | 2019-01-01 | 湖南小快智造电子科技有限公司 | Safety utilization of electric power device |
| CN109245040A (en) * | 2018-09-30 | 2019-01-18 | 德力西电气有限公司 | leakage protection circuit |
| CN110277763A (en) * | 2019-07-08 | 2019-09-24 | 上海磊跃自动化设备有限公司 | A kind of earth leakage protective device with low current trial jump function |
| CN112373307A (en) * | 2020-11-18 | 2021-02-19 | 北京现代汽车有限公司 | Charging protection method and system and vehicle |
| CN112798981A (en) * | 2020-12-29 | 2021-05-14 | 江苏航天大为科技股份有限公司 | Road traffic system with alternating current monitoring and protecting functions |
| CN112968418A (en) * | 2021-03-02 | 2021-06-15 | 四川长虹空调有限公司 | Electric blanket safety protection controller and method |
| CN113193538A (en) * | 2021-06-11 | 2021-07-30 | 林蔓琦 | Bidirectional leakage protector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202167827U (en) | Safe quick-break type leakage protector | |
| US9219360B2 (en) | Safe quick disconnect leakage protector | |
| CN201838982U (en) | Residual current protection device and circuit breaker using same | |
| CN100517896C (en) | Control circuit of ground fault circuit breaker | |
| CN204243728U (en) | Transformer overload protection warning device | |
| CN102623947A (en) | Leakage protector with phase line switching function | |
| CN202957575U (en) | Electric leakage breaker | |
| CN112531642B (en) | Residual current protection circuit and residual current protection device | |
| CN201556927U (en) | Electric leakage detection protecting circuit and electric leakage detection protector | |
| CN104505667A (en) | Voltage conversion type leakage protection plug | |
| CN101976815B (en) | Loaded multifunctional protection circuit | |
| CN100370664C (en) | Arc and leakage protector | |
| CN202940564U (en) | Three-phase leakage circuit breaker | |
| CN203747373U (en) | Electric leakage protection-used control integrated module and electric leakage protection circuit with same | |
| CN104901089A (en) | Switching voltage type leakage protection plug | |
| CN204696376U (en) | A kind of changing voltage type leakage protecting plug | |
| CN201051651Y (en) | A failure arc protection breaker | |
| CN103762557A (en) | Device and method for open-circuit-resistant protection of current transformer | |
| CN104600663A (en) | Voltage-current hybrid leakage protection plug | |
| CN104901090A (en) | Voltage conversion type earth leakage protection plug | |
| CN208352961U (en) | A kind of comprehensive protective circuit breaker | |
| CN101877476A (en) | Protector for preventing three-phase power circuit from generating high voltage | |
| CN202034769U (en) | Plastic shell leakage controller for three-phase power supply | |
| CN204205559U (en) | A kind of leakage protection circuit | |
| CN110726249B (en) | Leakage protection device and method and electric water heater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120314 Termination date: 20200809 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |