CN207082830U - A kind of sensitive failture current protection device of alternating current-direct current - Google Patents
A kind of sensitive failture current protection device of alternating current-direct current Download PDFInfo
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- CN207082830U CN207082830U CN201721098538.6U CN201721098538U CN207082830U CN 207082830 U CN207082830 U CN 207082830U CN 201721098538 U CN201721098538 U CN 201721098538U CN 207082830 U CN207082830 U CN 207082830U
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Abstract
The utility model discloses a kind of sensitive failture current protection device of alternating current-direct current; including a power circuit, one dependent on electric network source Fisrt fault current sensing means, one independently of line voltage the second fault current detection device, one be used for drive mechanism thread off drive device; the drive signal of Fisrt fault current sensing means and the second fault current detection device is connected in parallel to the control terminal of drive device, and has been carried out with isolation circuit mutually isolated.The utility model, which provides, is related to the sensitive failture current protection device of alternating current-direct current, and the device not only provides AC fault electric current, pulsating direct current fault-current protection, moreover it is possible to which offer includes smooth direct fault current, high frequency fault current protection.And AC fault current protection is still provided under loss of power.
Description
Technical field
It the utility model is related to a kind of sensitive failture current protection device of alternating current-direct current.
Background technology
The prior art of fault to ground Aftercurrent protecting equipment includes being used to detect exchange, pulsating direct current fault current
A types or AC type ground-fault interrupters, but with the application of the electrical equipments such as frequency converter, inverter.For high frequency fault current
And the protection equipment of smooth fault current increasingly becomes important.
Patent CN200410043294.2 discloses a kind of sensitive failture current protection device of alternating current-direct current, and the equipment is used for
Directly with the fault-current protection occasion that exchanges, it realizes that the detection mode of direct current passes through a decoupling device device and magnetic core
Secondary coil is connected.
Patent CN1387213A discloses will for the technology of the annular core in the failture current protection devices such as AC, DC
Ask.The patent highlights the requirement of the BH curve of magnetive cord.
Direct current detection method is utilized in the non-magnetic discrepancy for being saturated to saturation in patent US4276510.Circuit design
Tertiary coil and complicated analog circuit are also needed to, the difficulty and cost of realization is also increased, influences accuracy of detection.
In patent CN200810003355.0 direct current detection method need an independent sine wave generating circuit and
The sample rate current of two equal turn numbers, and follow-up detection circuit.
Patent CN200410043294.2 DC detecting stills need extra uncoupling device to realize, whole circuit compared with
For complexity.It is the detection for realizing DC current in patent CN1387213A, higher requirement is proposed to magnetic core, adds technique
Difficulty.Patent US4276510 is to allow inductance (magnetic conductivity) to change, by detect the inductance value of magnetic core under fault current it is different
Characteristic detects fault current, and whole circuit is complex.Direct current detection method needs in patent CN200810003355.0
An independent sine wave generating circuit and the sample rate current of two equal turn numbers, and follow-up detection circuit are wanted, circuit is more
It is complicated.
More for the usual electronic module of exciting circuit of prior art, structure is numerous and diverse, considerably increases the cost of circuit
With the reduction of reliability, the size of miniature circuit breaker is limited in addition, internal process will be brought complicated, radiated the problem of bad.
Utility model content
The utility model, which provides, is related to the sensitive failture current protection device of alternating current-direct current, and the device not only provides exchange event
Hinder electric current, pulsating direct current fault-current protection, moreover it is possible to which offer includes smooth direct fault current, high frequency fault current protection.And
AC fault current protection is still provided under loss of power.
To achieve these goals, the technical solution adopted in the utility model is：
A kind of sensitive failture current protection device of alternating current-direct current, including a power circuit, one depend on electric network source
Fisrt fault current sensing means, one independently of line voltage the second fault current detection device, one be used for drive
Drive signal and the connection of the drive device of mechanical unlocking, Fisrt fault current sensing means and the second fault current detection device
To the control terminal of drive device, and carried out with isolation circuit mutually isolated.
The utility model is further arranged to, and the Fisrt fault current sensing means includes signal sample circuit, letter
Number extraction circuit, logic processing circuit, are acquired, waveform after sampling warp by signal sample circuit to alternating current-direct current fault current
Signal extracting circuit is extracted, input logic process circuit, and logical process electricity is differentiated according to the signal extracted, and is produced
Raw drive signal.
The utility model is further arranged to, the signal sample circuit include magnetic core,
Around the magnetic core and be connected to resistance R4 and resistance R5 secondary coil,
The comparator A and comparator B that are powered by unipolarity power supply,
The divider resistance R1 and divider resistance R2 of offer reference voltage,
And feedback resistance R3,
The magnetic core, which surrounds, holds current-carrying conductor setting, and comparator B output pin is connected with resistance R5, comparator B's
Positive pin is connected with resistance R3, divider resistance R1, divider resistance R2, comparator A negative pin, comparator B negative pin and resistance R3, electricity
R4, comparator A output pin connection are hindered, resistance R3 one end and resistance R4, comparator A output pin, comparator B negative pin connect
Connect, comparator A positive pin is connected with resistance R4, secondary coil, and comparator A output pin is connected with resistance R4, and comparator A's is negative
Pin is connected with divider resistance R1, divider resistance R2, divider resistance R1 ground connection.
The utility model is further arranged to, and the signal extracting circuit includes resistance R6 and electric capacity C1, resistance R6's
One end is connected with signal sample circuit 8, and the resistance R6 other end is connected with electric capacity C1, logic processing circuit, and electric capacity C1 mono- is terminated
Ground, the electric capacity C1 other end are connected with resistance R6, logic processing circuit.
The utility model is further arranged to, and the logic processing circuit includes power supply circuit, comparison circuit, delay control
Circuit processed, when comparison circuit detects that signal reaches given threshold, signal magnitude is judged again after delay control circuit is handled, if
During still above given threshold, output drive signal, if signal is less than setting value, driving circuit does not work；Power supply circuit is to patrol
Collect process circuit and reliable reference power supply is provided.
The utility model is further arranged to, and the second fault current detection device includes magnetic core, around the magnetic
Core and the secondary coil for being connected to detection means, detection means are connected with isolation circuit.
The utility model is further arranged to, and the isolation circuit is made up of electric capacity and diode.
The utility model is further arranged to, and the comparator A and comparator B can use operational amplifier and/or three poles
Pipe amplifying circuit substitutes.
The utility model is further arranged to, and the power circuit provides necessary for Fisrt fault current sensing means
Power supply.
The beneficial effects of the utility model：
(1) the sensitive Aftercurrent protecting equipment electronic structure of alternating current-direct current provided by the utility model is simple and reliable, and
Defencive function is comprehensive；
(2) realized using a small number of inexpensive elements and hand over constant current detection circuit；
(3) eliminate in power-on and power-off moment due to malfunction caused by voltage instability；
(4) circuit is simple, and the isolation circuit without complexity realizes that two-way drives purpose.
Brief description of the drawings
Fig. 1 is circuit theory schematic diagram of the present utility model.
Embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is used to illustrate the utility model, but is not limited to the scope of the utility model.
The utility model is illustrated below with reference to Fig. 1.
A kind of sensitive failture current protection device of alternating current-direct current, including a power circuit, one depend on electric network source
Fisrt fault current sensing means 6, one be used to drive independently of 1, one, the second fault current detection device of line voltage
The drive device 5 of dynamic mechanical unlocking, the drive signal of the fault current detection device 1 of Fisrt fault current sensing means 6 and second
The control terminal of drive device is connected in parallel to, and has been carried out with isolation circuit 4 mutually isolated.
Wherein Fisrt fault current sensing means 6 includes signal sample circuit 8, signal extracting circuit 9, logic processing circuit
10, alternating current-direct current fault current is acquired by signal sample circuit 8, the waveform after sampling is carried through signal extracting circuit 9
Take, input logic process circuit 10, logic processing circuit 10 is differentiated according to the signal extracted, and produces drive signal.
Wherein signal sample circuit 8 includes magnetic core 7, surround the magnetic core 7 and is connected to resistance R4 and resistance R5 secondary
Coil 15, the comparator A to be powered by unipolarity power supply and comparator B, the divider resistance R1 and divider resistance that reference voltage is provided
R2 and feedback resistance R3, the encirclement of magnetic core 7 are held current-carrying conductor 14 and set, and comparator B output pin and resistance R5 connect
Connect, comparator B positive pin is connected with feedback resistance R3, divider resistance R1, divider resistance R2, comparator A negative pin, comparator B
Negative pin be connected with feedback resistance R3, resistance R4, comparator A output pin, feedback resistance R3 one end and resistance R4, compared with
The negative pin connection of device A output pin, comparator B, comparator A positive pin are connected with resistance R4, secondary coil 15, comparator A's
Output pin is connected with resistance R4, and comparator A negative pin is connected with divider resistance R1, divider resistance R2, divider resistance R2 ground connection.
Wherein signal extracting circuit 9 includes resistance R6 and electric capacity C1, and resistance R6 one end is connected with signal sample circuit 8,
The resistance R6 other end is connected with electric capacity C1, logic processing circuit 10, electric capacity C1 one end ground connection, electric capacity the C1 other end and resistance
R6, logic processing circuit 10 connect.
Wherein logic processing circuit 10 includes power supply circuit 11, comparison circuit 12, delay control circuit 13, comparison circuit 12
When detecting that signal reaches given threshold, signal magnitude is judged again after the processing of delay control circuit 13, if still above setting threshold
During value, output drive signal, if signal is less than setting value, driving circuit does not work；Power supply circuit 11 is logic processing circuit
10 provide reliable reference power supply.
Wherein the second fault current detection device 1 includes magnetic core 2, surround the magnetic core 2 and is connected to time of detection means 3
Level coil 16, detection means 3 are connected with isolation circuit 4.
Fig. 1 shows the embodiment of the sensitive two-way Aftercurrent protecting equipment of alternating current-direct current.It designates alternating current-direct current residue
The physical circuit framework of current protective device, be carried on residual current detection magnetic core 7 around major loop wire (conductor 14) with
Sample circuit 8 in Fisrt fault current detection circuit 6 forms the multi-resonant oscillating circuit of sensing fault current, and by sample circuit
8 are converted into sampled output signal.The then rear end of sample circuit 8 connection logic processing circuit 10, logic processing circuit 10 is by powering
Circuit 11, comparison circuit 12 and the circuit of delay control circuit 13 are formed, and front-end sampling output signal is compared with given threshold
After relatively, after the lasting delay relatively of a period of time, fault-signal is exported.Logic processing circuit 10 is directly connected to isolation circuit 4.
Second fault current detection circuit 1 uses electromagnetic type fault current detection, directly provides energy by residual current detection magnetic core 2
And signal, fault to ground electric current can be detected, unrelated with line voltage, its fault output signal is connected to isolation circuit 4.Isolation
Circuit 4 is made up of electric capacity and diode, mainly prevents the phase between two-way protection circuit the first and second fault current detections circuit
Mutually interference, the rear end of isolation circuit 4 are directly connected to drive device 5, are acted by the output signal trigger mechanism of isolation circuit 4.
Also include power circuit 17, the one end of power circuit 17 is connected with Fisrt fault current sensing means 6, and the other end is with leading
Body 14 connects, and power circuit 17 is mainly that line voltage is converted to the dc source needed for Fisrt fault current detection circuit 6.
Residual current detection magnetic core 7 in Fisrt fault current detection circuit 6, its first winding are that main power network current-carrying is led
Body, secondary windings are connected to sample circuit 8 and form multivibrator circuit, and multivibrator circuit produces self-oscillation, so as to
Make to be passed through carrier current signal in sample circuit, when main grid collapses, fault current is by carrier signal modulation.
Multivibrator circuit is connected with signal extracting circuit 9 in sample circuit 8, the fault-current signal and carrier wave of modulation
Signal demodulates in signal extracting circuit 9, and then sampled signal is connected to logic processing circuit 10.
Current signal after demodulation process is passed through comparison circuit 11, when fault-current signal amplitude is defeated more than comparison circuit 11
When entering the threshold voltage at end and continuing the certain time-delay time, comparison circuit output forward voltage signal, isolation circuit 4 is transmitted to, from
And driver 5, disconnect power network switch.
Power supply circuit 11 is that logic processing circuit 10 provides reliable reference power supply.
Comparator A and comparator B can be substituted with operational amplifier and/or transistor amplifier.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model technical principle is not departed from, some improvement and modification, above-mentioned vacation can also be made
If these improvement and modification also should be regarded as the scope of protection of the utility model.
Claims (9)
- A kind of 1. sensitive failture current protection device of alternating current-direct current, it is characterised in that：Including a power circuit (17), one according to The Fisrt fault current sensing means (6) in electric network source, second fault current detection independently of line voltage is relied to fill Put (1), a drive device (5) for being used for drive mechanism dropout, Fisrt fault current sensing means (6) and the second fault current The drive signal of detection means (1) is connected in parallel to the control terminal of drive device, and has been carried out with isolation circuit (4) mutually isolated.
- A kind of 2. sensitive failture current protection device of alternating current-direct current according to claim 1, it is characterised in that：Described first Fault current detection device (6) includes signal sample circuit (8), signal extracting circuit (9), logic processing circuit (10), by believing Number sample circuit (8) is acquired to alternating current-direct current fault current, and the waveform after sampling is extracted through signal extracting circuit (9), Input logic process circuit (10), logic processing circuit (10) is differentiated according to the signal extracted, and produces drive signal.
- A kind of 3. sensitive failture current protection device of alternating current-direct current according to claim 2, it is characterised in that：The signal Sample circuit (8) include magnetic core (7),Around the magnetic core (7) and be connected to resistance R4 and resistance R5 secondary coil (15),The comparator A and comparator B that are powered by unipolarity power supply,The divider resistance R1 and divider resistance R2 of offer reference voltage,And feedback resistance R3,The magnetic core (7), which is surrounded, holds current-carrying conductor (14) setting, and comparator B output pin is connected with resistance R5, comparator B Positive pin be connected with resistance R3, divider resistance R1, divider resistance R2, comparator A negative pin, comparator B negative pin and resistance R3, Resistance R4, comparator A output pin connection, resistance R3 one end and resistance R4, comparator A output pin, comparator B negative pin Connection, comparator A positive pin are connected with resistance R4, secondary coil (15), and comparator A output pin is connected with resistance R4, is compared Device A negative pin is connected with divider resistance R1, divider resistance R2, divider resistance R1 ground connection.
- A kind of 4. sensitive failture current protection device of alternating current-direct current according to claim 2, it is characterised in that：The signal Extraction circuit include resistance R6 and electric capacity C1, resistance R6 one end is connected with signal sample circuit (8), the resistance R6 other end and Electric capacity C1, logic processing circuit connection, electric capacity C1 one end ground connection, electric capacity the C1 other end and resistance R6, logic processing circuit connect Connect.
- A kind of 5. sensitive failture current protection device of alternating current-direct current according to claim 2, it is characterised in that：The logic Process circuit (10) includes power supply circuit (11), comparison circuit (12), delay control circuit (13), and comparison circuit (12) detects When signal reaches given threshold, signal magnitude is judged again after delay control circuit (13) processing, if during still above given threshold, Output drive signal, if signal is less than setting value, driving circuit does not work；Power supply circuit (11) is logic processing circuit (10) Reliable reference power supply is provided.
- A kind of 6. sensitive failture current protection device of alternating current-direct current according to claim 1, it is characterised in that：Described second Fault current detection device (1) includes magnetic core (2), surround the magnetic core (2) and is connected to the secondary coil of detection means (3) (16), detection means (3) is connected with isolation circuit (4).
- A kind of 7. sensitive failture current protection device of alternating current-direct current according to claim 1, it is characterised in that：The isolation Electric routing capacitance and diode composition.
- A kind of 8. sensitive failture current protection device of alternating current-direct current according to claim 3, it is characterised in that：The comparison Device A and comparator B can be substituted with operational amplifier and/or transistor amplifier.
- A kind of 9. sensitive failture current protection device of alternating current-direct current according to claim 1, it is characterised in that：The power supply Circuit (17) is that Fisrt fault current sensing means (6) provides necessary power supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721098538.6U CN207082830U (en) | 2017-08-30 | 2017-08-30 | A kind of sensitive failture current protection device of alternating current-direct current |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721098538.6U CN207082830U (en) | 2017-08-30 | 2017-08-30 | A kind of sensitive failture current protection device of alternating current-direct current |
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| CN207082830U true CN207082830U (en) | 2018-03-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332207A (en) * | 2017-08-30 | 2017-11-07 | 乐清拓优电气有限公司 | A kind of sensitive failture current protection device of alternating current-direct current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107332207A (en) * | 2017-08-30 | 2017-11-07 | 乐清拓优电气有限公司 | A kind of sensitive failture current protection device of alternating current-direct current |
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