CN202353175U - Overvoltage and undervoltage protection system for three-phase power system - Google Patents
Overvoltage and undervoltage protection system for three-phase power system Download PDFInfo
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- CN202353175U CN202353175U CN2011204087839U CN201120408783U CN202353175U CN 202353175 U CN202353175 U CN 202353175U CN 2011204087839 U CN2011204087839 U CN 2011204087839U CN 201120408783 U CN201120408783 U CN 201120408783U CN 202353175 U CN202353175 U CN 202353175U
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Abstract
The utility model discloses an overvoltage and undervoltage protection system for a three-phase power system, which comprises a rectifying unit, a sampling unit, an undervoltage judging unit, an undervoltage delaying unit, an overvoltage judging unit, an overvoltage delaying unit, a breaker triggering unit and a first signal isolating or picking unit, wherein the first signal isolating or picking unit is used for respectively isolating sampled voltage signals acquired by the sampling unit and output corresponding to each phase of voltage, and outputting the sampled voltage signals having the highest voltage value; the overvoltage judging unit is used for comparing the sampled voltage signals output by the first signal isolating or picking unit with an acquired overvoltage reference signal, and outputting an overvoltage signal when the sampled voltage signals output by the first signal isolating or picking unit is higher than the overvoltage reference signal. In the utility model, overvoltage judgment is performed on the sampled voltage signal in only one path, so the cost of the overvoltage and undervoltage protection system is reduced.
Description
Technical field
The utility model relates to distribution system power supply field, particularly a kind of over-and under-voltage protection system that is used for three-phase power supply system.
Background technology
In the practical application of industry and family expenses, three-phase power supply system is subject to the influence of extraneous factor and overvoltage or under-voltage problem occur, and the appearance of overvoltage or undervoltage condition may cause certain damage to load, and causes the certain economic loss.Therefore need overvoltage occur or when under-voltage at three-phase power supply system, utilize circuit breaker etc. to cut off the path of three-phase power supply system, so that circuit is protected.
Fig. 1 shows the universal architecture sketch map of the over-and under-voltage protection system of three-phase power supply system.As shown in Figure 1, this system mainly comprises: DC power source unit 10, rectification unit 20, sampling unit 30, overvoltage judging unit 40, overvoltage delay unit 50, under-voltage judging unit 60, under-voltage delay unit 70 and circuit breaker trigger element 80.
Wherein, DC power source unit 10 is used for step-down and voltage stabilizing processing are carried out in a certain phase voltage output of three-phase power supply system, and produces the galvanic current source.During concrete the realization, DC power subsystem 10 also can carry out step-down and voltage stabilizing processing to a certain phase voltage output of three-phase power supply system after rectification unit 20 is handled, and produces the galvanic current source.Perhaps, DC power source unit also can be produced by alternate manner, like battery etc.
Under-voltage judging unit 60 is by said DC power source unit 10 power supplies; And be used for a phase sampler voltage signal of current input is compared with the under-voltage reference signal that obtains; And when the sampled voltage signal of current input is lower than under-voltage reference signal, export under-voltage signal.
Under-voltage delay unit 70 is used for the output of said under-voltage judging unit 60 is carried out the time-delay output of second setting-up time; When the time of the under-voltage signal of said under-voltage judging unit 60 outputs reaches said second setting-up time; The output triggering signal; Control the breaker coil conducting that said circuit breaker trigger element 80 triggers in the three-phase power supply system loop, circuit breaker is broken off.
At present, when stating the over-and under-voltage protection system of three-phase power supply system in realization, cost is higher usually.
Summary of the invention
The utility model provides a kind of over-and under-voltage protection system that is used for three-phase power supply system, in order to the cost of the over-and under-voltage protection system that reduces three-phase power supply system.
The over-and under-voltage protection system that is used for three-phase power supply system that the utility model provides, said over-and under-voltage protection system can produce a under-voltage reference signal and and cross pressure reference signal; This system comprises: comprise rectification unit, sampling unit, under-voltage judging unit, under-voltage delay unit, overvoltage judging unit, overvoltage delay unit, circuit breaker trigger element and first Signal Spacing, get or the unit, wherein;
Said rectification unit is used for exporting after each phase voltage output with said three-phase power supply system converts direct current into by interchange;
Said sampling unit is used for each phase voltage output of the three-phase power supply system after said rectification unit rectification is sampled respectively, and the sampled voltage signal of corresponding each the phase voltage output of output;
Said under-voltage judging unit is used for a phase sampler voltage signal of current input and said under-voltage reference signal are compared, and when the sampled voltage signal of current input is lower than said under-voltage reference signal, exports under-voltage signal;
Said under-voltage delay unit is used for when the time that said under-voltage judging unit is exported under-voltage signal reaches one second setting-up time, to circuit breaker trigger element output triggering signal;
Said first Signal Spacing, get or the sampled voltage signal of each phase voltage output of correspondence that the unit is used for said sampling unit is obtained is isolated respectively, and export the sampled voltage signal that wherein magnitude of voltage is the highest;
Said overvoltage judging unit is used for said first Signal Spacing, gets or the sampled voltage signal of unit output compares with said mistake pressure reference signal; Said first Signal Spacing, get or the sampled voltage signal of unit output be higher than said when crossing pressure reference signal, the output overvoltage signal;
Said overvoltage delay unit is used for when the time of said overvoltage judging unit output overvoltage signal reaches one first setting-up time, to circuit breaker trigger element output triggering signal;
Said circuit breaker trigger element is used for when receiving the triggering signal of said under-voltage delay unit or the output of said overvoltage delay unit, triggering the breaker coil conducting in the said three-phase power supply system loop, and circuit breaker is broken off.
In the execution mode of the utility model; Said first Signal Spacing, get or the unit comprises: first pull down resistor and three first diodes, the positive pole of each first diode links to each other with a phase output terminal of sampling unit, negative pole links together back as said first signal, isolate and get or the output of unit; One end of said first pull down resistor links to each other with the negative pole of said three first diodes, other end ground connection.
Preferably; Said system further comprises: secondary signal is isolated, is got or the unit; Be used for the output of said under-voltage delay unit and said overvoltage delay unit is isolated respectively and focused on a bit; When therein arbitrary is output as triggering signal, triggering signal is exported to said circuit breaker trigger element;
Said circuit breaker trigger element comprises: first voltage-stabiliser tube, controllable silicon and first electric capacity; The positive pole of said first voltage-stabiliser tube isolates, gets with said secondary signal or the output of unit links to each other, negative pole links to each other with said silicon controlled gate pole; Main terminal of said silicon controlled links to each other with breaker coil in the three-phase power supply system loop, another main terminal ground connection, and an end of said first electric capacity links to each other with the negative pole of said first voltage-stabiliser tube, other end ground connection.
In an execution mode of the utility model; Said secondary signal is isolated, gets or the unit comprises: second pull down resistor and with corresponding to a plurality of second diodes of quantity of the output of said under-voltage delay unit and said overvoltage delay unit, the under-voltage delay unit that the positive pole of each second diode is corresponding with it or the output of overvoltage delay unit link to each other, negative pole links together back as said secondary signal isolation, get or the output of unit links to each other with the input of circuit breaker trigger element; One end of said second pull down resistor links to each other with the negative pole that said a plurality of second diodes link together, other end ground connection.
In an execution mode of the utility model; Said under-voltage judging unit comprises: three under-voltage judgment sub-unit; A phase sampler voltage signal and said under-voltage reference signal that each under-voltage judgment sub-unit is respectively applied for sampling unit output compare; When this phase sampler voltage signal was lower than said under-voltage reference signal, output was to under-voltage signal that should phase;
Said under-voltage delay unit comprises: three under-voltage time-delay subelements, the output of the corresponding under-voltage judgment sub-unit of time-delay subelement that each is under-voltage.
In an execution mode of the utility model; Said under-voltage judging unit comprises: a under-voltage judgment sub-unit; Be used for said first Signal Spacing, get or the sampled voltage signal and the said under-voltage reference signal of unit output compare; In said first Signal Spacing, get or the sampled voltage signal of unit output when being lower than said under-voltage reference signal, export under-voltage signal;
Said under-voltage delay unit comprises: a under-voltage time-delay subelement of corresponding said under-voltage judgment sub-unit.
Wherein, said overvoltage delay unit is the RC delay circuit, perhaps for being with the RC delay control circuit of metal-oxide-semiconductor;
Said under-voltage delay unit is the RC delay circuit, perhaps for being with the RC delay control circuit of metal-oxide-semiconductor.
In an execution mode of the utility model, the RC delay control circuit of said band metal-oxide-semiconductor comprises:
The 4th diode, the second pressure limiting resistance, second charge and discharge capacitance, second discharge and recharge resistance, second voltage-stabiliser tube and first metal-oxide-semiconductor; The positive pole of said the 4th diode links to each other with the output of corresponding overvoltage judging unit or under-voltage judging unit, negative pole links to each other with an end of the said second pressure limiting resistance; The other end of the said second pressure limiting resistance links to each other with an end of said second charge and discharge capacitance; The other end ground connection of said second charge and discharge capacitance, said second to discharge and recharge resistance parallelly connected with said second charge and discharge capacitance; The non-earth terminal that the positive pole of said second voltage-stabiliser tube and said first discharges and recharges resistance links to each other, negative pole links to each other with the grid of said first metal-oxide-semiconductor; The drain electrode of said first metal-oxide-semiconductor links to each other with the positive pole of said the 4th diode, and source electrode is the output of said overvoltage delay unit or under-voltage delay unit;
Perhaps, the RC delay control circuit of said band metal-oxide-semiconductor comprises: a RC delay circuit, gate-controlled switch and second metal-oxide-semiconductor;
The input of a said RC delay circuit links to each other with the output of corresponding overvoltage judging unit or under-voltage judging unit; The output of a said RC delay circuit links to each other with the control end of said gate-controlled switch; A link of said gate-controlled switch links to each other with DC power supply, another link ground connection; The control end of said metal-oxide-semiconductor links to each other with the output of under-voltage judging unit or overvoltage judging unit, and drain electrode links to each other with DC power supply, and source electrode is the output of said overvoltage delay unit or under-voltage delay unit.
In an execution mode of the utility model, a said RC delay circuit comprises: first triode, the 3rd charge and discharge capacitance, the 3rd pressure limiting resistance, second triode, the 4th pressure limiting resistance, the 4th charge and discharge capacitance, the 3rd discharge and recharge resistance, the 5th diode and second voltage-stabiliser tube; The base stage of said first triode links to each other with the output of corresponding overvoltage judging unit or under-voltage judging unit, collector electrode links to each other with DC power supply, emitter links to each other with an end of the 3rd charge and discharge capacitance; The other end ground connection of said the 3rd charge and discharge capacitance; One end of said the 3rd pressure limiting resistance links to each other with the emitter of said first triode, the other end links to each other with the base stage of second triode; The collector electrode of said second triode links to each other with an end of the 4th pressure limiting resistance, emitter links to each other with an end of the 4th charge and discharge capacitance; The other end of said the 4th pressure limiting resistance links to each other with DC power supply; The other end ground connection of said the 4th charge and discharge capacitance; The said the 3rd to discharge and recharge resistance parallelly connected with said the 4th charge and discharge capacitance; The non-earth terminal that the positive pole of said the 5th diode and the said the 3rd discharges and recharges resistance links to each other, negative pole links to each other with the positive pole of said second voltage-stabiliser tube; The negative pole of said second voltage-stabiliser tube is the output of a said RC delay circuit.
In an execution mode of the utility model, said gate-controlled switch comprises: the 3rd triode, the 5th pressure limiting resistance, the 4th triode and the 6th pressure limiting resistance; The base stage of said the 3rd triode links to each other with the output of a said RC delay circuit; The grounded emitter of said the 3rd triode, collector electrode link to each other with the base stage of the 4th triode and an end of the 5th pressure limiting resistance; The other end of said the 5th pressure limiting resistance links to each other with DC power supply; The grounded emitter of said the 4th triode, collector electrode link to each other with an end of said the 6th pressure limiting resistance; The other end of said the 6th pressure limiting resistance links to each other with DC power supply.
In an execution mode of the utility model, said DC power supply carries out producing after dividing potential drop and the voltage stabilizing through a certain phase voltage output to three-phase power supply system.
From such scheme, can find out; Owing to utilize first Signal Spacing in the utility model, get or the sampled voltage signal of each phase voltage output of correspondence that the unit obtains sampling unit is isolated respectively; And export the sampled voltage signal that wherein magnitude of voltage is the highest; Therefore can only comprise an amplifier or not comprise amplifier in the overvoltage judging unit, like other circuit of realizing comparing functions, be used for according to cross pressure reference signal to first Signal Spacing, get or the sampled voltage signal of unit output carries out overvoltage and judges; Thereby reduced the number of at least two amplifiers, reduced the cost of the over-and under-voltage protection system of three-phase power supply system.
Further; Through utilizing secondary signal to isolate, get or the unit isolates respectively the output of under-voltage delay unit and overvoltage delay unit and focuses on a bit; When therein arbitrary is output as triggering signal; Triggering signal is exported to said circuit breaker trigger element, thereby make the circuit breaker trigger element only comprise an amplifier or do not comprise amplifier, further reduced the cost of the over-and under-voltage protection system of three-phase power supply system.
In addition; Through making under-voltage judging unit also receive first Signal Spacing, get or the sampled voltage signal of unit output; Thereby make and also can only comprise an amplifier or not comprise amplifier in the under-voltage judging unit; Realize the circuit of comparing function like other, thereby also reduced the number of the amplifier in the under-voltage judging unit, further reduced the cost of the over-and under-voltage protection system of three-phase power supply system again.
In addition, through in under-voltage delay unit and overvoltage delay unit, adopting the delay circuit have metal-oxide-semiconductor, the output of can realize delaying time output and under-voltage judging unit or overvoltage judging unit and logic, thereby avoid the generation of misoperation.
Description of drawings
To make those of ordinary skill in the art more know the above-mentioned of the utility model and other feature and advantage through describe the preferred embodiment of the utility model in detail with reference to accompanying drawing below, in the accompanying drawing:
Fig. 1 is the universal architecture sketch map of the over-and under-voltage protection system of three-phase power supply system.
Fig. 2 is the structural representation of the over-and under-voltage protection system of the three-phase power supply system in the previous application of order.
Fig. 3 is the structural representation of the over-and under-voltage protection system of the three-phase power supply system among embodiment of the utility model.
Fig. 4 is the structural representation of the over-and under-voltage protection system of the three-phase power supply system among another embodiment of the utility model.
Fig. 5 is the structural representation of the over-and under-voltage protection system of the three-phase power supply system among another embodiment of the utility model.
Fig. 6 is an internal structure sketch map of overvoltage delay unit in the utility model.
Fig. 7 is the structural representation of the over-and under-voltage protection system of the three-phase power supply system in the correspondence example embodiment illustrated in fig. 4.
Fig. 8 is another concrete structural representation of realizing of overvoltage time-delay subelement in the example shown in Figure 6.
Among the figure: the under-voltage delay unit 80-of the 10-DC power source unit 20-rectification unit 30-sampling unit 40-overvoltage judging unit 50-overvoltage under-voltage judging unit 70-of delay unit 60-circuit breaker trigger element 90-first Signal Spacing get or, unit 100-secondary signal isolates, gets or the unit
The 201-first commutating phase subelement 202-second commutating phase subelement 203-third phase commutator unit
The 301-first phase sampler subelement 302-second phase sampler subelement 303-third phase sampling subelement
The 401-first phase overvoltage judgment sub-unit 402-second phase overvoltage judgment sub-unit 403-third phase overvoltage judgment sub-unit 404-overvoltage judgment sub-unit
501-first phase overvoltage time-delay subelement 502-second phase overvoltage time-delay subelement 503-third phase overvoltage time-delay subelement 504-overvoltage time-delay subelement
The under-voltage judgment sub-unit of the 601-first mutually under-voltage judgment sub-unit 602-second under-voltage judgment sub-unit 604-of mutually under-voltage judgment sub-unit 603-third phase
The under-voltage time-delay subelement of the 701-first mutually under-voltage time-delay subelement 702-second mutually under-voltage time-delay subelement 703-third phase under-voltage time-delay subelement 704-
The under-voltage time-delay trigger element 803-voltage-stabiliser tube conducting trigger element of the overvoltage time-delay trigger element 802-band amplifier of 801-band amplifier
5041-the one RC delay circuit
Embodiment
Clearer with novel purpose, technical scheme and advantage, below lift embodiment to the utility model further explain.
Fig. 2 shows the structural representation of the over-and under-voltage protection system of the three-phase power supply system in the previous application of order.As shown in Figure 2; Rectification unit 20 in this system, sampling unit 30, overvoltage judging unit 40, overvoltage delay unit 50, under-voltage judging unit 60 and under-voltage delay unit 70 comprise three corresponding subelements respectively, the phase voltage output of the corresponding three-phase power supply system of each subelement.In addition, circuit breaker trigger element 80 comprises: the overvoltage time-delay trigger element 801 of band amplifier and the under-voltage time-delay trigger element 802 of band amplifier.
Wherein, rectification unit 20 comprises the first commutating phase subelement 201, the second commutating phase subelement 202 and third phase commutator unit 203.Wherein, the first commutating phase subelement 201 is used for rectification is carried out in first phase voltage output of three-phase power supply system, and obtains the first phase direct voltage output of corresponding first phase voltage output; The second commutating phase subelement 202 is used for rectification is carried out in second phase voltage output of three-phase power supply system, and obtains the second phase direct voltage output of corresponding second phase voltage output; Third phase commutator unit 203 is used for rectification is carried out in the third phase voltage output of three-phase power supply system, and obtains the third phase direct voltage output of corresponding third phase voltage output.
Sampling unit 30 comprises the first phase sampler subelement 301, the second phase sampler subelement 302 and third phase sampling subelement 303.Wherein, the first phase sampler subelement 301 is used for step-down or step-down delay process are carried out in the first phase direct voltage after rectification output, obtains the first phase sampler voltage signal of corresponding first phase voltage output; The second phase sampler subelement 302 is used for step-down or step-down delay process are carried out in the second phase direct voltage after rectification output, obtains the second phase sampler voltage signal of corresponding second phase voltage output; Third phase sampling subelement 303 is used for to the third phase direct voltage after the rectification output and carries out step-down or step-down delay process, obtains the third phase sampled voltage signal of corresponding third phase voltage output.
Overvoltage delay unit 50 comprises first phase overvoltage time-delay subelement 501, second phase overvoltage time-delay subelement 502 and third phase overvoltage time-delay subelement 503.Wherein, First phase overvoltage time-delay subelement 501 is used for the output of the said first phase overvoltage judgment sub-unit 401 is carried out the time-delay output of first setting-up time; When the time of the said first phase overvoltage judgment sub-unit 401 output high level reached said first setting-up time, the overvoltage time-delay trigger element 801 of controlling said band amplifier triggered circuit breakers and breaks off; Second phase overvoltage time-delay subelement 502 is used for the output of the said second phase overvoltage judgment sub-unit 402 is carried out the time-delay output of first setting-up time; When the time of the said second phase overvoltage judgment sub-unit 402 output high level reached said first setting-up time, the overvoltage time-delay trigger element 801 of controlling said band amplifier triggered circuit breakers and breaks off; Third phase overvoltage time-delay subelement 503 is used for the output of said third phase overvoltage judgment sub-unit 403 is carried out the time-delay output of first setting-up time; When the time of said third phase overvoltage judgment sub-unit 403 output high level reaches said first setting-up time; The high level of output expression triggering signal; Control the breaker coil conducting that the overvoltage time-delay trigger element 801 of said band amplifier triggers in the three-phase power supply system loops, circuit breaker is broken off.
Under-voltage judging unit 60 comprises first mutually under-voltage judgment sub-unit 601, the second mutually under-voltage judgment sub-unit 602 and the under-voltage judgment sub-unit 603 of third phase of being supplied power by DC power source unit 10 respectively.Wherein, The first mutually under-voltage judgment sub-unit 601 comprises four high guaily unit; Be used for the first phase sampler voltage signal and the under-voltage reference signal that obtains are compared, when the first phase sampler voltage signal is lower than under-voltage reference signal, the high level of the output expression first mutually under-voltage signal; The second mutually under-voltage judgment sub-unit 602 comprises the 5th amplifier; Be used for the second phase sampler voltage signal and the under-voltage reference signal that obtains are compared; When the second phase sampler voltage signal is lower than under-voltage reference signal, the high level of the output expression second mutually under-voltage signal; Third phase is under-voltage, and judgment sub-unit 603 comprises the 6th amplifier; Be used for third phase sampled voltage signal and the under-voltage reference signal that obtains are compared; When third phase sampled voltage signal is lower than under-voltage reference signal, the high level of the under-voltage signal of output expression third phase.Wherein, under-voltage reference signal divider resistance capable of using carries out producing after the dividing potential drop to said DC power source unit 10.
Under-voltage delay unit 70 comprises first mutually under-voltage time-delay subelement 701, second mutually under-voltage time-delay subelement 702 and the under-voltage time-delay subelement 703 of third phase.Wherein, The first mutually under-voltage time-delay subelement 701 is used for the output of the said first mutually under-voltage judgment sub-unit 601 is carried out the time-delay output of second setting-up time; When the time of the said first mutually under-voltage judgment sub-unit 601 output high level reached said second setting-up time, the under-voltage time-delay trigger element 802 of controlling said band amplifier triggered circuit breakers and breaks off; The second mutually under-voltage time-delay subelement 702 is used for the output of the said second mutually under-voltage judgment sub-unit 602 is carried out the time-delay output of second setting-up time; When the time of the said second mutually under-voltage judgment sub-unit 602 output high level reached said second setting-up time, the under-voltage time-delay trigger element 802 of controlling said band amplifier triggered circuit breakers and breaks off; Third phase is under-voltage, and time-delay subelement 703 is used for the output of the under-voltage judgment sub-unit 603 of said third phase is carried out the time-delay output of second setting-up time; When the time of the under-voltage judgment sub-unit of said third phase 603 output high level reaches said second setting-up time; The high level of output expression triggering signal; The under-voltage time-delay trigger element 802 of controlling said band amplifier triggers the breaker coil conducting in the three-phase power supply system loops, and circuit breaker is broken off.
Can find out that from application shown in Figure 2 it has adopted three amplifiers in overvoltage judging unit 40, i.e. first amplifier to the, three amplifiers; Three amplifiers in under-voltage judging unit 60, have been adopted; I.e. four high guaily unit to the six amplifiers, and in circuit breaker trigger element 80, adopted two amplifiers, adopted eight amplifiers altogether; And adopt the cost of so many amplifiers is higher, makes that the cost of the over-and under-voltage protection system in this application is higher.
Based on the over-and under-voltage protection system of three-phase power supply system shown in Figure 2, can reduce the cost of over-and under-voltage protection system in the utility model through the amplifier number in the minimizing over-and under-voltage system.
Fig. 3 shows the structural representation among embodiment of the utility model.As shown in Figure 3, at first can reduce the amplifier number in the overvoltage judging unit 40 among the utility model embodiment.Specifically can comprise: between sampling unit 30 and overvoltage judging unit 40, increase by first Signal Spacing, get or unit 90; The sampled voltage signal that each phase voltage of correspondence that is used for that sampling unit 30 is obtained is exported is isolated respectively, and exports the sampled voltage signal that wherein magnitude of voltage is the highest.
Correspondingly; Overvoltage judges that judging unit 40 can only comprise an overvoltage judgment sub-unit 404; This overvoltage judgment sub-unit 404 can comprise an amplifier; This amplifier is by said DC power source unit 10 power supplies; And be used for said first Signal Spacing, get or the pressure reference signal of crossing that the sampled voltage Signals & Systems of unit 90 output provide compares, said first Signal Spacing, get or the sampled voltage signal of unit 90 outputs be higher than said when crossing pressure reference signal, the high level of output expression overvoltage signal.Wherein, crossing pressure reference signal divider resistance capable of using carries out producing after the dividing potential drop to said DC power source unit 10.During concrete the realization, also available other can realize that the above-mentioned relatively circuit of arbitration functions replaces the amplifier in the above-mentioned overvoltage judgment sub-unit 404.
Correspondingly; Overvoltage delay unit 50 also includes only a time-delay subelement 504; Be used for the output of said overvoltage judgment sub-unit 404 is carried out the time-delay output of first setting-up time; When the time of said overvoltage judgment sub-unit 404 output high level reaches said first setting-up time, to the high level of circuit breaker trigger element 80 output expression triggering signals.
At this moment, except that above-mentioned first Signal Spacing, get or unit 90, overvoltage judging unit 40 and overvoltage delay unit 50, the function of other each component units and annexation can be identical with the function and the annexation of each component units shown in Figure 1.
In addition, also can on the basis of system shown in Figure 3, further reduce amplifier in the under-voltage time-delay trigger element 802 of overvoltage time-delay trigger element 801 and band amplifier of band amplifier among another embodiment of the utility model.As shown in Figure 4; Specifically can comprise: between overvoltage delay unit 50, under-voltage delay unit 70 and circuit breaker trigger element 80, increase secondary signal and isolate, get or unit 100; Be used for the output of said under-voltage delay unit 70 and said overvoltage delay unit 50 is isolated respectively and focused on a bit; When therein arbitrary is output as high level, high level is exported to said circuit breaker trigger element 80.Circuit breaker trigger element 80 triggers the breaker coil conducting in the three-phase power supply system loop when receiving the high level of expression triggering signal, circuit breaker is broken off.
At this moment, this circuit breaker trigger element 80 can be the time-delay trigger element of overvoltage and under-voltage shared band amplifier, also can be fully not with the circuit breaker trigger element of amplifier, can think voltage-stabiliser tube conducting trigger element 803 as shown in Figure 3.
Further, reduce the number of the amplifier in the under-voltage judging unit 60 on also can basis in other embodiment of the utility model in system shown in Figure 4.As shown in Figure 5; At this moment; Also can include only a under-voltage judgment sub-unit 604 in the under-voltage judging unit 60; Judgment sub-unit 604 that this is under-voltage comprises an amplifier, and this amplifier is by 10 power supplies of said DC power source unit, is used for said first Signal Spacing, gets or under-voltage reference signal that the sampled voltage Signals & Systems of unit 90 outputs provide compares; In said first Signal Spacing, get or the sampled voltage signal of unit 90 output when being lower than said under-voltage reference signal the high level of the under-voltage signal of output expression.Wherein, under-voltage reference signal divider resistance capable of using carries out producing after the dividing potential drop to said DC power source unit 10.During concrete the realization, also available other can realize that the above-mentioned relatively circuit of arbitration functions replaces the amplifier in the above-mentioned under-voltage judgment sub-unit 604.
Correspondingly; Said under-voltage delay unit 70 includes only a under-voltage time-delay subelement 704 in the corresponding said under-voltage judgment sub-unit 604; Be used for the output of said under-voltage judgment sub-unit 604 is carried out the time-delay output of second setting-up time; When the time of said under-voltage judgment sub-unit 604 output high level reaches said first setting-up time, to the high level of circuit breaker trigger element 80 output expression triggering signals.
During concrete the realization, each component units in the over-and under-voltage protection system of above-mentioned three-phase power supply system and subelement all have multiple concrete way of realization.
With overvoltage time-delay subelement and under-voltage time-delay subelement is example, and it all can be realized by common RC delay circuit, also can be realized by the RC delay control circuit of band metal-oxide-semiconductor.
Fig. 6 shows a kind of structural representation of time-delay subelement of the RC delay control circuit with metal-oxide-semiconductor.Among Fig. 6, be example with overvoltage time-delay subelement 504.As shown in Figure 6, this time-delay subelement 504 comprises: a RC delay circuit 5041, normally closed gate-controlled switch K and metal-oxide-semiconductor Q5.Wherein, The input of the one RC delay circuit 5041 links to each other with the output of overvoltage judgment sub-unit 404; The output of the one RC delay circuit 5041 links to each other with the control end of said normally closed gate-controlled switch K; The link of said gate-controlled switch K links to each other with DC power supply, another link ground connection; The control end of said metal-oxide-semiconductor Q5, promptly grid links to each other with the output of overvoltage judgment sub-unit 404, and drain electrode links to each other source ground with DC power supply.The one RC delay circuit 5041 is used for the output of said overvoltage judgment sub-unit 404 is delayed time, and when reaching predetermined delay time, controls normally closed gate-controlled switch K and breaks off, and DC power supply inserts the drain electrode of metal-oxide-semiconductor Q5.
During concrete the realization, a RC delay circuit 5041 can be realized by the RC time-delay electronic circuit and the voltage-stabiliser tube of two-stage band triode, but normally closed hole K switch can be realized by the triode of two interlock controls.In addition, other concrete implementation can also be arranged, enumerate no longer one by one here.
Enumerating an example below describes its a kind of concrete realization.Fig. 7 is the structural representation of the over-and under-voltage protection system of the three-phase power supply system in the correspondence example embodiment illustrated in fig. 4.As shown in Figure 6, in the loop of three-phase power supply system Ua, Ub, Uc, N, be in series with circuit breaker Sw.
In this example; What rectification unit 20 adopted is halfwave rectifier, promptly utilizes diode D1 (i.e. the first commutating phase subelement), diode D2 (i.e. the second commutating phase subelement) and diode D3 (being third phase commutator unit) that halfwave rectifier is carried out in the output of Ua phase voltage, the output of Ub phase voltage and the output of Uc phase voltage of three-phase power supply system respectively.
DC power source unit 10 comprises: diode D4, the pressure limiting resistance R 1, R2, R3, R4 and the R5 that are connected in series, charge and discharge capacitance C4, voltage-stabiliser tube D40, pressure limiting resistance R 38 and voltage-stabiliser tube D41.Wherein, the positive pole of diode D4 links to each other with a phase output terminal of rectification unit, and the negative pole with diode D1 in this example links to each other; The negative pole of diode D4 links to each other with pressure limiting resistance R 1; Pressure limiting resistance R 5 links to each other with the end of charge and discharge capacitance C4; The other end ground connection of charge and discharge capacitance C4; Voltage-stabiliser tube D40 is parallelly connected with charge and discharge capacitance C4; Pressure limiting resistance R 38 is with parallelly connected with voltage-stabiliser tube D40 again after voltage-stabiliser tube D41 connects.Wherein, pressure limiting resistance R 38 links to each other with the positive pole of voltage-stabiliser tube D41, the minus earth of voltage-stabiliser tube D41.The output of the just very said DC power source unit 10 of voltage-stabiliser tube D41.During concrete the realization, pressure limiting resistance R 1, R2, R3, R4 and R5 also can use the resistance of a resistance or other number to replace.
Sampling unit 30 comprises three sampling subelements, and in this example, the first phase sampler subelement 301 is used to gather the voltage output of Ua phase, and the corresponding sampled voltage signal of output.It specifically comprises: divider resistance R6, R7 and the R8 that is connected in series, divider resistance R15, diode D5, charge and discharge capacitance C1 and discharge and recharge resistance R 18.Wherein, divider resistance R6 exports mutually with one of rectification unit 20 and links to each other, and the negative pole with diode D1 in this example links to each other; Divider resistance R8 links to each other with the end of divider resistance R15 and the positive pole of diode D5; The other end ground connection of divider resistance R15; The negative pole of diode D5 links to each other with the end of charge and discharge capacitance C1; The other end ground connection of charge and discharge capacitance C1; It is parallelly connected with charge and discharge capacitance C1 to discharge and recharge resistance R 18; The non-earth terminal that discharges and recharges resistance R 18 is said first to adopt the output of subelement 301 mutually.The second phase sampler subelement 302 is used to gather the voltage output of Ub phase, and the corresponding sampled voltage signal of output.It specifically comprises: divider resistance R9, R10 and the R11 that is connected in series, divider resistance R16, diode D6, charge and discharge capacitance C2 and discharge and recharge resistance R 19.Wherein, divider resistance R9 exports mutually with one of rectification unit 20 and links to each other, and the negative pole with diode D2 in this example links to each other; Divider resistance R11 links to each other with the end of divider resistance R16 and the positive pole of diode D6; The other end ground connection of divider resistance R16; The negative pole of diode D6 links to each other with the end of charge and discharge capacitance C2; The other end ground connection of charge and discharge capacitance C2; It is parallelly connected with charge and discharge capacitance C2 to discharge and recharge resistance R 19; The non-earth terminal that discharges and recharges resistance R 19 is said second to adopt the output of subelement 302 mutually.Third phase sampling subelement 303 is used to gather the voltage output of Uc phase, and the corresponding sampled voltage signal of output.It specifically comprises: divider resistance R12, R13 and the R14 that is connected in series, divider resistance R17, diode D7, charge and discharge capacitance C3 and discharge and recharge resistance R 20.Wherein, divider resistance R12 exports mutually with one of rectification unit 20 and links to each other, and the negative pole with diode D3 in this example links to each other; Divider resistance R14 links to each other with the end of divider resistance R17 and the positive pole of diode D7; The other end ground connection of divider resistance R17; The negative pole of diode D7 links to each other with the end of charge and discharge capacitance C3; The other end ground connection of charge and discharge capacitance C3; It is parallelly connected with charge and discharge capacitance C3 to discharge and recharge resistance R 20; The non-earth terminal that discharges and recharges resistance R 20 is the output that said third phase adopts subelement 303.
Through in direct voltage unit and employing unit, adopting a plurality of sub-resistance to form a divider resistance, can make full use of limited narrow space, and reduce system power dissipation in the utility model, realize better area of dissipation.
Under-voltage reference signal is carried out obtaining after the dividing potential drop to the output of direct voltage unit 10 by divider resistance R21 and divider resistance R22, divider resistance R21 and divider resistance R22 after promptly connecting, and an end links to each other with the output of direct voltage unit 10, other end ground connection.Tie point between divider resistance R21 and the divider resistance R22 is under-voltage reference signal.The non-earth terminal that is divider resistance R22 is under-voltage reference signal.
Under-voltage judging unit 60 comprises three under-voltage judgment sub-unit; The first under-voltage judgment sub-unit 601 comprises an amplifier U1A; This amplifier U1A is by 10 power supplies of direct voltage unit; The power end that is amplifier U1A links to each other with the positive pole of voltage-stabiliser tube D41, the negative power end ground connection of amplifier U1A, and amplifier U1A is used to utilize under-voltage reference signal that the sampled voltage signal of Ua phase is carried out under-voltage judgement.Particularly, sampled voltage signal, positive input that the reverse input end of amplifier U1A receives the Ua phase receive under-voltage reference signal, and promptly reverse input end links to each other with the non-earth terminal that discharges and recharges resistance R 18, and positive input links to each other with the non-earth terminal of divider resistance R22.The second under-voltage judgment sub-unit 602 comprises an amplifier U1B; This amplifier U1B is by 10 power supplies of direct voltage unit; The power end that is amplifier U1B links to each other with the positive pole of voltage-stabiliser tube D41; The negative power end ground connection of amplifier U1B, amplifier U1B is used to utilize under-voltage reference signal that the sampled voltage signal of Ub phase is carried out under-voltage judgement.Particularly, sampled voltage signal, positive input that the reverse input end of amplifier U1B receives the Ub phase receive under-voltage reference signal, and promptly reverse input end links to each other with the non-earth terminal that discharges and recharges resistance R 19, and positive input links to each other with the non-earth terminal of divider resistance R22.The 3rd under-voltage judgment sub-unit 603 comprises an amplifier U1C; This amplifier U1C is by 10 power supplies of direct voltage unit; The power end that is amplifier U1C links to each other with the positive pole of voltage-stabiliser tube D41; The negative power end ground connection of amplifier U1C, amplifier U1C is used to utilize under-voltage reference signal that the sampled voltage signal of Uc phase is carried out under-voltage judgement.Particularly, sampled voltage signal, positive input that the reverse input end of amplifier U1C receives the Uc phase receive under-voltage reference signal, and promptly reverse input end links to each other with the non-earth terminal that discharges and recharges resistance R 20, and positive input links to each other with the non-earth terminal of divider resistance R22.
Under-voltage delay unit 70 comprises three under-voltage time-delay subelements, and the first mutually under-voltage time-delay subelement 701 comprises: diode D11, pressure limiting resistance R 23, charge and discharge capacitance C5 and discharge and recharge resistance R 27.Wherein, the positive pole of diode D11 links to each other with the output of corresponding amplifier, and in this example, the positive pole of diode D11 links to each other with the output of amplifier U1A; The negative pole of diode D11 links to each other with an end of pressure limiting resistance R 23; The other end of pressure limiting resistance R 23 links to each other with the end of charge and discharge capacitance C5; The other end ground connection of charge and discharge capacitance C5, it is parallelly connected with charge and discharge capacitance C5 to discharge and recharge resistance R 27; The non-earth terminal that discharges and recharges resistance R 27 is the output of the said first mutually under-voltage time-delay subelement 701.The first mutually under-voltage time-delay subelement 702 comprises: diode D12, pressure limiting resistance R 24, charge and discharge capacitance C5 and discharge and recharge resistance R 28.Wherein, the positive pole of diode D12 links to each other with the output of corresponding amplifier, and in this example, the positive pole of diode D12 links to each other with the output of amplifier U1B; The negative pole of diode D12 links to each other with an end of pressure limiting resistance R 24; The other end of pressure limiting resistance R 24 links to each other with the end of charge and discharge capacitance C6; The other end ground connection of charge and discharge capacitance C6, it is parallelly connected with charge and discharge capacitance C6 to discharge and recharge resistance R 28; The non-earth terminal that discharges and recharges resistance R 28 is the output of the said second mutually under-voltage time-delay subelement 702.Third phase is under-voltage, and time-delay subelement 703 comprises: diode D13, pressure limiting resistance R 25, charge and discharge capacitance C7 and discharge and recharge resistance R 29.Wherein, the positive pole of diode D13 links to each other with the output of corresponding amplifier, and in this example, the positive pole of diode D13 links to each other with the output of amplifier U1C; The negative pole of diode D13 links to each other with an end of pressure limiting resistance R 25; The other end of pressure limiting resistance R 25 links to each other with the end of charge and discharge capacitance C7; The other end ground connection of charge and discharge capacitance C7, it is parallelly connected with charge and discharge capacitance C7 to discharge and recharge resistance R 29; The non-earth terminal that discharges and recharges resistance R 29 is the output of the under-voltage time-delay subelement 703 of said third phase.
First Signal Spacing, get or unit 90 comprises: pull down resistor R26 and three diode D8, D9 and D10, wherein, and the output of the positive pole of diode D8 and the first phase sampler subelement 301, promptly the non-earth terminal of R18 links to each other; The output of the positive pole of diode D9 and the second phase sampler subelement 302, promptly the non-earth terminal of R19 links to each other; The output of the positive pole of diode D10 and third phase sampling subelement 303, promptly the non-earth terminal of R20 links to each other; And the negative pole of diode D8, D9 and D10 link together the back as said first Signal Spacing, get or the output of unit 90; The end of pull down resistor R26 links to each other with the negative pole of said three diode D8, D9 and D10, the other end ground connection of pull down resistor R26.
Cross pressure reference signal and the output of direct voltage unit 10 is carried out obtaining after the dividing potential drop by divider resistance R30 and divider resistance R31, divider resistance R30 and divider resistance R31 after promptly connecting, an end links to each other with the output of direct voltage unit 10, other end ground connection.Tie point between divider resistance R30 and the divider resistance R31 was a pressure reference signal, and promptly the non-earth terminal of divider resistance R31 was a pressure reference signal.
Overvoltage delay unit 50 only comprises overvoltage time-delay subelement 504, and this overvoltage time-delay subelement 504 comprises: triode Q1, charge and discharge capacitance C8, pressure limiting resistance R 33, triode Q2, pressure limiting resistance R 35, charge and discharge capacitance C9, discharge and recharge resistance R 34, diode D17, voltage-stabiliser tube D42, triode Q3, pressure limiting resistance R 37, triode Q4, pressure limiting resistance R 36 and metal-oxide-semiconductor Q5.Wherein, the base stage of triode Q1 links to each other with the output of corresponding amplifier, in this example, links to each other with the output of amplifier U1D, and the collector electrode of triode Q1 links to each other with the output of DC power source unit 10, and promptly the positive pole with voltage-stabiliser tube D41 links to each other; The emitter of triode Q1 links to each other with the end of charge and discharge capacitance C8; The other end ground connection of charge and discharge capacitance C8; One end of three pressure limiting resistance R 33 links to each other with the emitter of triode Q1, the other end links to each other with the base stage of triode Q2; The collector electrode of triode Q2 links to each other with an end of pressure limiting resistance R 35, emitter links to each other with the end of charge and discharge capacitance C9; The other end of pressure limiting resistance R 35 links to each other with the output of said DC power source unit 10, and promptly the positive pole with voltage-stabiliser tube D41 links to each other; The other end ground connection of charge and discharge capacitance C9; It is parallelly connected with charge and discharge capacitance C9 to discharge and recharge resistance R 34; The positive pole of diode D17 links to each other with the said non-earth terminal that discharges and recharges resistance R 34, negative pole links to each other with the positive pole of voltage-stabiliser tube D42; The negative pole of said voltage-stabiliser tube D42 links to each other with the base stage of said triode Q3; The grounded emitter of said triode Q3, collector electrode link to each other with the base stage of triode Q4 and an end of pressure limiting resistance R 37; The other end of said pressure limiting resistance R 37 links to each other with the output of said DC power source unit 10, and promptly the positive pole with voltage-stabiliser tube D41 links to each other; The grounded emitter of triode Q4, collector electrode link to each other with an end of pressure limiting resistance R 36; The other end of said pressure limiting resistance R 36 links to each other with the output of DC power source unit 10, and promptly the positive pole with voltage-stabiliser tube D41 links to each other; The output of the grid of metal-oxide-semiconductor Q5 and said overvoltage judgment sub-unit 404, promptly the output of amplifier U1D links to each other, drain electrode links to each other with the collector electrode of said triode Q4, and source electrode is the delay time output of subelement 504 of said overvoltage.
Secondary signal is isolated, is got or unit 100 comprise pull down resistor R32 and with the corresponding to a plurality of diodes of quantity of the output of said under-voltage delay unit 70 and said overvoltage delay unit 50; In this example; The output of under-voltage delay unit 70 has three; The output of overvoltage delay unit 50 has one, thus secondary signal is isolated, is got or unit 100 in diode have four, i.e. diode D14, D15, D16 and D18.Wherein, the positive pole of diode D14 links to each other with the output of the first mutually under-voltage time-delay subelement 701, promptly links to each other with the non-earth terminal of R27; The positive pole of diode D15 links to each other with the output of the second mutually under-voltage time-delay subelement 702, promptly links to each other with the non-earth terminal of R25; The positive pole of diode D16 links to each other with the output of the under-voltage time-delay subelement 703 of third phase, promptly links to each other with the non-earth terminal of R29; The positive pole of diode D18 links to each other with the output of overvoltage time-delay subelement 504, promptly links to each other with the source electrode of metal-oxide-semiconductor; And the negative pole of diode D14, D15, D16 and the D18 back that links together isolates, gets as said secondary signal or the output of unit 100; The end of pull down resistor R32 links to each other with the negative pole of said four diode D14, D15, D16 and D18, the other end ground connection of pull down resistor R32.
Circuit breaker trigger element 80 in this example is a voltage-stabiliser tube conducting trigger element 804, and it comprises: voltage-stabiliser tube D43, controllable silicon U1 and first capacitor C 10.Wherein, the positive pole of voltage-stabiliser tube D43 isolates, gets with said secondary signal or the output of unit 100 links to each other, and promptly the negative pole with four diode D14, D15, D16 and D18 links to each other; The negative pole of voltage-stabiliser tube D43 links to each other with the gate pole of said controllable silicon U1; Main terminal of said controllable silicon U1 links to each other with the breaker coil Coil in the three-phase power supply system loop, another main terminal ground connection, and an end of said capacitor C 10 links to each other with the negative pole of said voltage-stabiliser tube D43, other end ground connection.
In other example of the utility model, under-voltage time-delay subelement 701,702 and 703 can adopt the internal structure of overvoltage time-delay subelement 504 shown in Figure 7; Equally, overvoltage time-delay subelement 504 also can adopt under-voltage time-delay subelement 701,702 shown in Figure 7 and 703 internal structure.And first mutually under-voltage time-delay subelement 701, the second mutually under-voltage time-delay subelement 702 can have identical internal structure with the under-voltage time-delay subelement 703 of third phase, also can have different internal structures.
In addition; Give the optional internal structure implementation of another under-voltage time-delay subelement 701,702,703 and overvoltage time-delay subelement 504 in the utility model; As shown in Figure 8; Be example with overvoltage time-delay subelement among Fig. 8, it can comprise: diode D19, pressure limiting resistance R 39, charge and discharge capacitance C11, discharge and recharge resistance R 40, voltage-stabiliser tube D44 and metal-oxide-semiconductor Q6.Wherein, the positive pole of diode D19 links to each other with the output of corresponding amplifier U1D, and the negative pole of diode D19 links to each other with an end of pressure limiting resistance R 39; The other end of pressure limiting resistance R 39 links to each other with the end of said charge and discharge capacitance C11; The other end ground connection of charge and discharge capacitance C11; It is parallelly connected with charge and discharge capacitance C11 to discharge and recharge resistance R 40; The positive pole of voltage-stabiliser tube D44 links to each other with the non-earth terminal that discharges and recharges resistance R 40, and the negative pole of voltage-stabiliser tube D44 links to each other with the grid of metal-oxide-semiconductor Q6; The drain electrode of metal-oxide-semiconductor Q6 links to each other with the positive pole of said diode D19, and source electrode is the output of said overvoltage time-delay subelement 504.
In addition, under-voltage time-delay subelement 704 can have the internal structure of above-mentioned arbitrary concrete way of realization equally.
In the utility model through in under-voltage delay unit and overvoltage delay unit, adopting the delay circuit have metal-oxide-semiconductor, can realize delaying time output and amplifier output and logic, thereby avoid the generation of misoperation.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (11)
1. over-and under-voltage protection system that is used for three-phase power supply system, said over-and under-voltage protection system can produce a under-voltage reference signal and and cross pressure reference signal; It is characterized in that; Comprise rectification unit (20), sampling unit (30), under-voltage judging unit (60), under-voltage delay unit (70), first Signal Spacing, get or unit (90), overvoltage judging unit (40), overvoltage delay unit (50) and circuit breaker trigger element (80), wherein:
Said rectification unit (20) is used for exporting after each phase voltage output with said three-phase power supply system converts direct current into by interchange;
Said sampling unit (30) is used for each phase voltage output of the three-phase power supply system after said rectification unit (20) rectification is sampled respectively, and the sampled voltage signal of corresponding each the phase voltage output of output;
Said under-voltage judging unit (60) is used for a phase sampler voltage signal of current input and said under-voltage reference signal are compared, and when the sampled voltage signal of current input is lower than said under-voltage reference signal, exports under-voltage signal;
Said under-voltage delay unit (70) is used for when the time of the under-voltage signal of said under-voltage judging unit (60) output reaches one second setting-up time, to circuit breaker trigger element (80) output triggering signal;
Said first Signal Spacing, get or the sampled voltage signal of each phase voltage output of correspondence that unit (90) are used for said sampling unit (30) is obtained is isolated respectively, and export the sampled voltage signal that wherein magnitude of voltage is the highest;
Said overvoltage judging unit (40) is used for said first Signal Spacing, gets or the sampled voltage signal of unit (90) output compares with said mistake pressure reference signal; Said first Signal Spacing, get or the sampled voltage signal of unit (90) output be higher than said when crossing pressure reference signal, the output overvoltage signal;
Said overvoltage delay unit (50) is used for when the time of said overvoltage judging unit (40) output overvoltage signal reaches one first setting-up time, to circuit breaker trigger element (80) output triggering signal;
Said circuit breaker trigger element (80) is used for when receiving the triggering signal of said under-voltage delay unit (70) or said overvoltage delay unit (50) output, triggering the breaker coil conducting in the said three-phase power supply system loop, and circuit breaker is broken off.
2. system according to claim 1; It is characterized in that; Said first Signal Spacing, get or unit (90) comprising: first pull down resistor (R26) and three first diodes (D8, D9, D10); Each first diode (positive pole D10) links to each other with a phase output terminal of sampling unit (30) for D8, D9, negative pole links together back as said first signal, isolate and to get or the output of unit (90); One end of said first pull down resistor (R26) links to each other with the negative pole of said three first diodes (D8, D9, D10), other end ground connection.
3. system according to claim 1; It is characterized in that; Said system further comprises: secondary signal is isolated, is got or unit (100); Be used for the output of said under-voltage delay unit (70) and said overvoltage delay unit (50) is isolated respectively and focused on a bit, when therein arbitrary is output as triggering signal, triggering signal exported to said circuit breaker trigger element (80);
Said circuit breaker trigger element (80) comprising: first voltage-stabiliser tube (D43), controllable silicon (U1) and first electric capacity (C10); The positive pole of said first voltage-stabiliser tube (D43) is isolated, is got with said secondary signal or the output of unit (100) links to each other, negative pole links to each other with the gate pole of said controllable silicon (UI); Main terminal of said controllable silicon (UI) links to each other with the breaker coil in the three-phase power supply system loop, another main terminal ground connection, and an end of said first electric capacity (C10) links to each other with the negative pole of said first voltage-stabiliser tube (D43), other end ground connection.
4. system according to claim 3; It is characterized in that; Said secondary signal is isolated, gets or unit (100) comprising: second pull down resistor (R32) and with corresponding to a plurality of second diodes of quantity (D14, D15, D16, D18) of the output of said under-voltage delay unit (70) and said overvoltage delay unit (50); Each second diode (D14; D15, D16 isolates, gets as said secondary signal after the under-voltage delay unit (70) that positive pole D18) is corresponding with it or the output of overvoltage delay unit (50) link to each other, negative pole links together or the output of unit (100) links to each other with the input of circuit breaker trigger element (80); One end of said second pull down resistor (R32) links to each other with the negative pole that said a plurality of second diodes (D14, D15, D16, D18) link together, other end ground connection.
5. system according to claim 1; It is characterized in that said under-voltage judging unit (60) comprising: three under-voltage judgment sub-unit (601,602,603), judgment sub-unit (601 that each is under-voltage; 602; 603) the phase sampler voltage signal and the said under-voltage reference signal that are respectively applied for sampling unit (60) output compare, and when this phase sampler voltage signal is lower than said under-voltage reference signal, export under-voltage signal that should phase;
Said under-voltage delay unit (70) comprising: three under-voltage time-delay subelements (701,702,703), the output of the corresponding under-voltage judgment sub-unit of time-delay subelement (701,702,703) (601,602,603) that each is under-voltage.
6. system according to claim 1; It is characterized in that; Said under-voltage judging unit (60) comprising: a under-voltage judgment sub-unit (604); Be used for said first Signal Spacing, get or sampled voltage signal and the said under-voltage reference signal of unit (90) output compare, in said first Signal Spacing, get or the sampled voltage signal that exports unit (90) when being lower than said under-voltage reference signal, export under-voltage signal;
Said under-voltage delay unit (70) comprising: a under-voltage time-delay subelement (704) of corresponding said under-voltage judgment sub-unit (604).
7. according to each described system in the claim 1 to 6, it is characterized in that said overvoltage delay unit (50) is the RC delay circuit, perhaps for being with the RC delay control circuit of metal-oxide-semiconductor;
Said under-voltage delay unit (70) is the RC delay circuit, perhaps for being with the RC delay control circuit of metal-oxide-semiconductor.
8. system according to claim 7 is characterized in that, the RC delay control circuit of said band metal-oxide-semiconductor comprises:
The 4th diode (D19), the second pressure limiting resistance (R39), second charge and discharge capacitance (C11), second discharge and recharge resistance (R40), second voltage-stabiliser tube (D44) and first metal-oxide-semiconductor (Q6); The positive pole of said the 4th diode (D19) links to each other with the output of corresponding overvoltage judging unit (40) or under-voltage judging unit (60), negative pole links to each other with an end of the said second pressure limiting resistance (R39); The other end of the said second pressure limiting resistance (R39) links to each other with an end of said second charge and discharge capacitance (C11); The other end ground connection of said second charge and discharge capacitance (C11), said second to discharge and recharge resistance (R40) parallelly connected with said second charge and discharge capacitance (C11); The non-earth terminal that the positive pole of said second voltage-stabiliser tube (D44) and said first discharges and recharges resistance (R40) links to each other, negative pole links to each other with the grid of said first metal-oxide-semiconductor (Q6); The drain electrode of said first metal-oxide-semiconductor (Q6) links to each other with the positive pole of said the 4th diode (D19), and source electrode is the output of said overvoltage delay unit (50) or under-voltage delay unit (70);
Perhaps, the RC delay control circuit of said band metal-oxide-semiconductor comprises: a RC delay circuit (5041), gate-controlled switch (K) and second metal-oxide-semiconductor (Q5);
The input of a said RC delay circuit (5041) links to each other with the output of corresponding overvoltage judging unit (40) or under-voltage judging unit (60); The output of a said RC delay circuit (5041) links to each other with the control end of said gate-controlled switch (K); A link of said gate-controlled switch (K) links to each other with DC power supply, another link ground connection; The control end of said metal-oxide-semiconductor (Q5) links to each other with the output of under-voltage judging unit (60) or overvoltage judging unit (40), and drain electrode links to each other with DC power supply, and source electrode is the output of said overvoltage delay unit (50) or under-voltage delay unit (70).
9. system according to claim 8; It is characterized in that a said RC delay circuit (5041) comprising: first triode (Q1), the 3rd charge and discharge capacitance (C8), the 3rd pressure limiting resistance (R33), second triode (Q2), the 4th pressure limiting resistance (R35), the 4th charge and discharge capacitance (C9), the 3rd discharge and recharge resistance (R34), the 5th diode (D17) and second voltage-stabiliser tube (D42); The base stage of said first triode (Q1) links to each other with the output of corresponding overvoltage judging unit (40) or under-voltage judging unit (60), collector electrode links to each other with DC power supply, emitter links to each other with an end of the 3rd charge and discharge capacitance (C8); The other end ground connection of said the 3rd charge and discharge capacitance (C8); One end of said the 3rd pressure limiting resistance (R33) links to each other with the emitter of said first triode (Q1), the other end links to each other with the base stage of second triode (Q2); The collector electrode of said second triode (Q2) links to each other with an end of the 4th pressure limiting resistance (R35), emitter links to each other with an end of the 4th charge and discharge capacitance (C9); The other end of said the 4th pressure limiting resistance (R35) links to each other with DC power supply; The other end ground connection of said the 4th charge and discharge capacitance (C9); The said the 3rd to discharge and recharge resistance (R34) parallelly connected with said the 4th charge and discharge capacitance (C9); The non-earth terminal that the positive pole of said the 5th diode (D17) and the said the 3rd discharges and recharges resistance (R34) links to each other, negative pole links to each other with the positive pole of said second voltage-stabiliser tube (D42); The negative pole of said second voltage-stabiliser tube (D42) is the output of a said RC delay circuit (5041).
10. system according to claim 9 is characterized in that, said gate-controlled switch (K) comprising: the 3rd triode (Q3), the 5th pressure limiting resistance (R37), the 4th triode (Q4) and the 6th pressure limiting resistance (R36); The base stage of said the 3rd triode (Q3) links to each other with the output of a said RC delay circuit (5041); The grounded emitter of said the 3rd triode (Q3), collector electrode link to each other with the base stage of the 4th triode (Q4) and an end of the 5th pressure limiting resistance (R37); The other end of said the 5th pressure limiting resistance (R37) links to each other with DC power supply; The grounded emitter of said the 4th triode (Q4), collector electrode link to each other with an end of said the 6th pressure limiting resistance (R36); The other end of said the 6th pressure limiting resistance (R36) links to each other with DC power supply.
11. each described system in 10 is characterized in that according to Claim 8, said DC power supply carries out producing after dividing potential drop and the voltage stabilizing through a certain phase voltage output to three-phase power supply system.
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| CN103683184A (en) * | 2012-08-31 | 2014-03-26 | 西门子公司 | Undervoltage-overvoltage protection device and method |
| CN103675416A (en) * | 2012-09-03 | 2014-03-26 | 西门子公司 | Undervoltage-overvoltage protection device and method |
| WO2014086231A1 (en) * | 2012-12-03 | 2014-06-12 | 华为技术有限公司 | Overvoltage protection device and method |
| CN104078928A (en) * | 2013-03-29 | 2014-10-01 | 松下电器产业株式会社 | Undervoltage tripping device of circuit breaker and over/undervoltage tripping device |
| CN104078929A (en) * | 2013-03-29 | 2014-10-01 | 松下电器产业株式会社 | Breaker, undervoltage tripping device, and under/overvoltage tripping device |
| CN105372480A (en) * | 2015-11-17 | 2016-03-02 | 上海控源电子科技有限公司 | Over voltage, under voltage and phase failure detection circuit for charging pile |
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| CN109861175A (en) * | 2019-01-31 | 2019-06-07 | 大禹电气科技股份有限公司 | A kind of voltage sample and protection circuit of power cell |
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2011
- 2011-10-24 CN CN2011204087839U patent/CN202353175U/en not_active Expired - Fee Related
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| CN105372480A (en) * | 2015-11-17 | 2016-03-02 | 上海控源电子科技有限公司 | Over voltage, under voltage and phase failure detection circuit for charging pile |
| CN109861175A (en) * | 2019-01-31 | 2019-06-07 | 大禹电气科技股份有限公司 | A kind of voltage sample and protection circuit of power cell |
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