CN102540070A - Control and detection circuit for four relays and detection method thereof - Google Patents
Control and detection circuit for four relays and detection method thereof Download PDFInfo
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- CN102540070A CN102540070A CN2012100271004A CN201210027100A CN102540070A CN 102540070 A CN102540070 A CN 102540070A CN 2012100271004 A CN2012100271004 A CN 2012100271004A CN 201210027100 A CN201210027100 A CN 201210027100A CN 102540070 A CN102540070 A CN 102540070A
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Abstract
The invention discloses a control and detection circuit for four relays and a detection method thereof. The control and detection circuit for the four relays comprises an inverter unit, a power grid, a power supply circuit unit, a control circuit unit, a relay unit, a detection circuit unit and a driving circuit unit, wherein the relay unit is electrically connected between the inverter unit and the power grid, a first node, a second node, a third node and a fourth node are arranged among the relay unit, the inverter unit and the power grid, the input end of the detection circuit unit is electrically connected to the first node, the second node, the third node and the fourth node, and the output end of the detection circuit unit and the input end of the driving circuit unit are electrically connected to the control circuit unit. According to the control and detection circuit for the four relays and the detection method thereof, the fault detection of the relay unit is carried out at any time according to requirements by arranging the first node, the second node, the third node and the fourth node and also by transmitting a signal to the control circuit unit through the detection circuit unit so as to ensure that the relay unit is at a normal state. The method is flexible, has a simple structure and is convenient to execute.
Description
Technical field
The present invention relates to the relay field, especially relate to a kind of four relay controls and testing circuit and detection method thereof.
Background technology
Photovoltaic combining inverter is used for converting the direct current that solar panel produces to alternating current and is delivered directly on the electrical network, and promptly the output terminal of inverter will directly or through isolating transformer be connected with electrical network.For satisfying safety requirements, safety requires at inverter output end and electrical network input end two group relaies of need connecting, and occurs with the assurance system that inverter can in time break off with electrical network reliably when unusual.As shown in Figure 1, concerning single-phase inverter, need connect two relays between first output terminal of inverter and the L line of electrical network, second output terminal of inverter and the N line of electrical network two relays of also need connecting, need use four relays altogether.Safety required before inverter is connected to the grid, and whether must detect each relay earlier has fault.
Generally, following two kinds of faults may appear in relay: first kind of fault is that relay receives closure signal but relay contact can't adhesive; Second kind of fault is that relay is received cut-off signal but relay contact continues sticking the couplet to cause and can't break off, and keeps opening state always.For first kind of fault, its consequence is that the output terminal of inverter can not be connected to electrical network, can't operate as normal, but can not bring danger; And for second kind of fault, when equipment need break away from electrical network, but can't in time break away from, tend to cause catastrophic effect.
For guaranteeing safety, whether normally safety requires before inverter is incorporated into the power networks, must check each relay adhesive and disconnection earlier.And relay itself does not possess this function, how to control and detects these four relays and just become cumbersome thing.In the prior art, usually to control of single relay design and testing circuit, yet will accomplish control and the detection to four even more relays, rely on hardware circuit fully, circuit can more complicated, even possibly can't accomplish required repertoire.
Summary of the invention
The defective that The present invention be directed to the existence of above-mentioned background technology provides a kind of through hardware and simple a kind of four the relay controls of software structure combining and testing circuit and control method thereof.
For realizing above-mentioned purpose; The invention discloses a kind of four relays control and testing circuit; It comprises inverter unit, electrical network, power circuit unit, control circuit unit, relay unit, testing circuit unit and drive circuit unit; Said relay unit is electrically connected between said inverter unit and the electrical network; Said relay unit comprises first relay, second relay, the 3rd relay and the 4th relay, and said first relay and said second relay are connected in series, and said the 3rd relay and said the 4th relay are connected in series; Said power circuit unit is that said relay unit, testing circuit unit, drive circuit unit and control circuit unit provide power supply, and said control circuit unit is provided with first signal end, secondary signal end, first control end and second control end; Be provided with first node between first output terminal of said relay unit and said inverter unit; Be provided with Section Point between second output terminal of said relay unit and said inverter unit; Be provided with the 3rd node between the first input end of said relay unit and said electrical network, be provided with the 4th node between second input end of said relay unit and said electrical network; Said testing circuit unit comprises the first detection module and second detection module; Said first detection module input end is electrically connected at said first node and the 4th node; The said second detection module input end is electrically connected at said the 3rd node and Section Point; The output terminal of said first detection module is electrically connected at said first signal end, and the output terminal of said second detection module is electrically connected at said secondary signal end; Said drive circuit unit comprises first driver module and second driver module; Said first driver module input end and said first control end electrically connect; Said second driver module input end and said second control end electrically connect; The said first driver module output terminal electrically connects said first relay and the 3rd relay control end, and the said second driver module output terminal electrically connects said second relay and the 4th relay control end.
Further; Said first detection module comprises first rectification unit, first partial pressure unit, first filter unit, the first current limliting unit and the first isolated feedback unit, and said first rectification unit, first partial pressure unit, first filter unit, the first current limliting unit and the first isolated feedback unit electrically connect successively; Said second detection module comprises second rectification unit, second partial pressure unit, second filter unit, the second current limliting unit and the second isolated feedback unit, and said second rectification unit, second partial pressure unit, second filter unit, the second current limliting unit and the second isolated feedback unit electrically connect successively.
Further; The said first isolated feedback unit is first photoelectrical coupler; The collector of said first photoelectrical coupler is electrically connected at said power circuit unit; The emitter of said first photoelectrical coupler is electrically connected with the 4th resistance, and said the 4th resistance eutral grounding, the emitter of said first photoelectrical coupler are electrically connected at first signal end of said control circuit unit; Said first rectification unit is the 5th diode, and said the 5th diode anode correspondence is electrically connected at said first node; Said first partial pressure unit comprises first resistance and second resistance; Said first resistance, one end and the 5th diode cathode electrically connect; The said first resistance other end and said second resistance, one end electrically connect, and the said second resistance other end correspondence is electrically connected at said the 4th node; Said first filter unit comprises first electric capacity, and said first electric capacity and said second resistance are connected in parallel; The said first current limliting unit comprises the 3rd resistance, and said the 3rd resistance one end is electrically connected between said first resistance and said second resistance, and the anode of said the 3rd resistance other end and said first photoelectrical coupler electrically connects.
Further, said the 5th diode substitutes with full bridge rectifier.
Further; The said second isolated feedback unit is second photoelectrical coupler; The collector of said second photoelectrical coupler is electrically connected at said power circuit unit; The emitter of said second photoelectrical coupler is electrically connected with the 8th resistance, and said the 8th resistance eutral grounding, the emitter of said second photoelectrical coupler are electrically connected at the secondary signal end of said control circuit unit; Said second rectification unit is the 6th diode, and said the 6th diode anode correspondence is electrically connected at said the 3rd node; Said second partial pressure unit comprises the 5th resistance and the 6th resistance; Said the 5th resistance one end and the 6th diode cathode electrically connect; Said the 5th resistance other end and said the 6th resistance one end electrically connect, and said the 6th resistance other end correspondence is electrically connected at said Section Point; Said second filter unit comprises second electric capacity, and said second electric capacity and said the 6th resistance are connected in parallel; The said second current limliting unit comprises the 7th resistance, and said the 7th resistance one end is electrically connected between said the 5th resistance and said the 6th resistance, and the anode of said the 7th resistance other end and said second photoelectrical coupler electrically connects.
Further, said the 6th diode substitutes with full bridge rectifier.
Further, a control end of a control end of a control end of a control end of said first relay, said second relay, said the 3rd relay and said the 4th relay electrically connects with the power circuit unit respectively; Another control end of another control end of said first relay and said the 3rd relay electrically connects, and the first input end of corresponding said relay unit; Another control end of another control end of said second relay and said the 4th relay electrically connects; And second input end of corresponding said relay unit; The said first driver module output terminal electrically connects the first input end of said relay unit, and the said second driver module output terminal electrically connects second input end of said relay unit.
Further; Said first driver module comprises first chip for driving, the 9th resistance, the tenth resistance and first triode; First control end of said first chip for driving input end and said control circuit unit electrically connects; Said first chip for driving output terminal and said the 9th resistance one end electrically connect; The base stage of said the 9th resistance other end and said first triode electrically connects, and said the tenth resistance is electrically connected between the base stage and emitter of said first triode, and the collector of said first triode and the first input end of said relay unit electrically connect; Said second driver module comprises second chip for driving, the 11 resistance, the 12 resistance and second triode; Second control end of said second chip for driving input end and said control circuit unit electrically connects; Said second chip for driving output terminal and said the 11 resistance one end electrically connect; The base stage of said the 11 resistance other end and said second triode electrically connects; Said the 12 resistance is electrically connected between the base stage and emitter of said second triode, and second input end of the collector of said second triode and said relay unit electrically connects.
Further; The control end of said first relay is connected in parallel to first diode; The control end of said second relay is connected in parallel to second diode; The control end of said the 3rd relay is connected in parallel to the 3rd diode, and the control end of said the 4th relay is connected in parallel to the 4th diode.
The invention discloses the control method of a kind of four relays control and testing circuit, it comprises the steps:
(A), first control end of said control circuit unit and second control end are exported a high level signal respectively; Said first driver module and second driver module receive high level signal, said first relay, second relay, the 3rd relay and the 4th relay closes; If said first relay and second relay have at least one not have adhesive, then change step B over to; If said the 3rd relay and the 4th relay have at least one not have adhesive, then change step C over to; If said first relay, second relay, the 3rd relay and the normal adhesive of the 4th relay then change step D over to;
(B), said first node can't be communicated with said the 3rd node; Said first detection module sends first signal end that low level feeds back signal to said control circuit unit; Said control circuit unit receives feedback signal, confirms that said first relay and second relay have at least one not have adhesive;
(C), said Section Point can't be communicated with said the 4th node; Said second detection module sends the secondary signal end that low level feeds back signal to said control circuit unit; Said control circuit unit receives feedback signal, confirms that said the 3rd relay and the 4th relay have at least one not have adhesive;
(D), said first node is communicated with said the 3rd node; This moment, said first detection module was through first node and the 4th node and the electric connection of said electrical network; Said first detection module sends first signal end that feeds back signal to said control circuit unit of high level; Said control circuit unit receives feedback signal, confirms the normally adhesive of said first relay and second relay;
Said Section Point is communicated with said the 4th node; This moment, said second detection module was through Section Point and the 3rd node and the electric connection of said electrical network; Said second detection module sends the secondary signal end that feeds back signal to said control circuit unit of high level; Said control circuit unit receives feedback signal, confirms the normally adhesive of said the 3rd relay and the 4th relay; At this moment, change step e over to;
(E), first control end of said control circuit unit output high level signal; The second control end output low level signal of said control circuit unit; Said first relay and the 3rd relay continue closed, and said second relay and the 4th relay break off; At this moment, if said second relay can't break off, then change step F over to; If the 4th relay can't break off, then change step G over to; If said second relay and the 4th relay all can normally break off, then change step H over to;
(F), said first node is communicated with said the 3rd node; This moment, said first detection module was through first node and the 4th node and the electric connection of said electrical network; Said first detection module sends first signal end that feeds back signal to said control circuit unit of high level; Said control circuit unit receives feedback signal, confirms that said second relay can't break off;
(G), said Section Point is communicated with said the 4th node; This moment, said second detection module was through Section Point and the 3rd node and the electric connection of said electrical network; Said second detection module sends the secondary signal end that feeds back signal to said control circuit unit of high level; Said control circuit unit receives feedback signal, confirms that said the 4th relay can't break off;
(H), said first node and the 3rd node can't be communicated with; Section Point and the 4th node can't be communicated with; The said first detection module and second detection module all can not be communicated with said electrical network; Said first detection module sends first signal end that low level feeds back signal to said control circuit unit; Said second detection module sends the secondary signal end that low level feeds back signal to said control circuit unit, and said control circuit unit receives feedback signal, confirms that said second relay and the 4th relay all can normally break off; At this moment, change step I over to;
(I), the first control end output low level signal of said control circuit unit; High level signal of second control end output of said control circuit unit; Said first relay and the 3rd relay break off, and said second relay and the 4th relay continue closed; At this moment, if said first relay can't break off, then change step J over to; If the 3rd relay can't break off, then change step K over to; If said first relay and the 3rd relay all can normally break off, then change step L over to;
(J), said first node is communicated with said the 3rd node; This moment, said first detection module was through first node and the 4th node and the electric connection of said electrical network; Said first detection module sends first signal end that feeds back signal to said control circuit unit of high level; Said control circuit unit receives feedback signal, confirms that said first relay can't break off;
(K), said Section Point is communicated with said the 4th node; This moment, said second detection module was through Section Point and the 3rd node and the electric connection of said electrical network; Said second detection module sends the secondary signal end that feeds back signal to said control circuit unit of high level; Said control circuit unit receives feedback signal, confirms that said the 3rd relay can't break off;
(L), said first node and the 3rd node can't be communicated with; Section Point and the 4th node can't be communicated with; The said first detection module and second detection module all can not be communicated with said electrical network; Said first detection module sends first signal end that low level feeds back signal to said control circuit unit; Said second detection module sends the secondary signal end that low level feeds back signal to said control circuit unit, and said control circuit unit receives feedback signal, confirms that said first relay and the 3rd relay all can normally break off; The relay fault detect finishes.
In sum; A kind of four relay controls of the present invention and testing circuit and detection method thereof be through being provided with first node, Section Point, the 3rd node and the 4th node, and send signal through the first detection module and second detection module and give control circuit unit, at any time relay unit carried out fault detect as required; Guarantee that first relay, second relay, the 3rd relay and the 4th relay are in normal condition; Flexible method, simple in structure, convenient enforcement.
Description of drawings
Fig. 1 is the structural principle block diagram of the embodiment of the invention.
Fig. 2 is a structural representation of the present invention.
Embodiment
For further understanding characteristic of the present invention, technological means and the specific purposes that reached, function, the present invention is described in further detail below in conjunction with accompanying drawing and embodiment.
As depicted in figs. 1 and 2, a kind of four relays control of the present invention and testing circuit comprise inverter unit 10, electrical network 20, power circuit unit 30, control circuit unit 40, relay unit 50, testing circuit unit 60 and drive circuit unit 70.Said power circuit unit 30 provides low-voltage dc power supply for said relay unit 50, testing circuit unit 60, drive circuit unit 70 and control circuit unit 40.
Said control circuit unit 40 can be digital microprocessor (DSP) or the microcontroller (MCU) in the inverter unit 10; Also can be independently digital microprocessor or microcontroller, said control circuit unit 40 be provided with the first signal end FB1, secondary signal end FB2, the first control end Rly1 and the second control end Rly2.
Said relay unit 50 is electrically connected between said inverter unit 10 and the electrical network 20, can in time break off with said electrical network 20 reliably to guarantee said inverter unit 10.Be provided with first node KT1 between first output terminal of said relay unit 50 and said inverter unit 10; Be provided with Section Point KT2 between second output terminal of said relay unit 50 and said inverter unit 10; Be provided with the 3rd node KT3 between the first input end of said relay unit 50 and said electrical network 20, be provided with the 4th node KT4 between second input end of said relay unit 50 and said electrical network 20; Said relay unit 50 comprises first relay K 1, second relay K 2, the 3rd relay K 3 and the 4th relay K 4; Said first relay K 1 is connected in series with said second relay K 2, and said the 3rd relay K 3 is connected in series with said the 4th relay K 4; The control end of said first relay K 1 is connected in parallel to the first diode D1; The control end of said second relay K 2 is connected in parallel to the second diode D2; The control end of said the 3rd relay K 3 is connected in parallel to the 3rd diode D3; The control end of said the 4th relay K 4 is connected in parallel to the 4th diode D4, and the said first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 are used to prevent that the control end voltage of control end and the 4th relay K 4 of control end, the 3rd relay K 3 of control end, second relay K 2 of said first relay K 1 is too high and cause said first relay K 1, second relay K 2, the 3rd relay K 3 and the 4th relay K 4 breakdown; One control end of one control end of one control end of one control end of said first relay K 1, said second relay K 2, said the 3rd relay K 3 and said the 4th relay K 4 electrically connects with the 12V dc power supply terminal of power circuit unit 30 respectively.Another control end of another control end of said first relay K 1 and said the 3rd relay K 3 electrically connects, and the first input end of corresponding said relay unit 50; Another control end of another control end of said second relay K 2 and said the 4th relay K 4 electrically connects, and second input end of corresponding said relay unit 50.
Said testing circuit unit 60 comprises the first detection module 61 and second detection module 62; Said first detection module 61 comprises first rectification unit 611, first partial pressure unit 612, first filter unit 613, the first current limliting unit 614 and the first isolated feedback unit 615; Said first rectification unit 611, first partial pressure unit 612, first filter unit 613, the first current limliting unit 614 and the first isolated feedback unit 615 electrically connect successively; The said first isolated feedback unit 615 is the first photoelectrical coupler U1; The collector of the said first photoelectrical coupler U1 is electrically connected at the 5V dc power supply terminal of said power circuit unit 30; The emitter of the said first photoelectrical coupler U1 is electrically connected with the 4th resistance R 4; Said the 4th resistance R 4 ground connection, the output terminal of the corresponding said first detection module 61 of the emitter of the said first photoelectrical coupler U1 also is electrically connected at the first signal end FB1 of said control circuit unit 40; Said first rectification unit 611 is the 5th diode D5, and an input end of the corresponding said first detection module 61 of said the 5th diode D5 anode also is electrically connected at said first node KT1; Said first partial pressure unit 612 comprises first resistance R 1 and second resistance R 2; Said first resistance R, 1 one ends and the 5th diode D5 negative electrode electrically connect; Said first resistance R, 1 other end and said second resistance R, 2 one ends electrically connect, and another input end of the corresponding said first detection module 61 of said second resistance R, 2 other ends also is electrically connected at said the 4th node KT4; Said first filter unit 613 comprises first capacitor C 1, and said first capacitor C 1 is connected in parallel with said second resistance R 2; The said first current limliting unit 614 comprises the 3rd resistance R 3, and said the 3rd resistance R 3 one ends are electrically connected between said first resistance R 1 and said second resistance R 2, and the anode of said the 3rd resistance R 3 other ends and the said first photoelectrical coupler U1 electrically connects.Said the 5th diode D5 also can substitute with full bridge rectifier.
Said second detection module 62 comprises second rectification unit 621, second partial pressure unit 622, second filter unit 623, the second current limliting unit 624 and the second isolated feedback unit 625; Said second rectification unit 621, second partial pressure unit 622, second filter unit 623, the second current limliting unit 624 and the second isolated feedback unit 625 electrically connect successively; The said second isolated feedback unit 625 is the second photoelectrical coupler U2; The collector of the said second photoelectrical coupler U2 is electrically connected at the 5V dc power supply terminal of said power circuit unit 30; The emitter of the said second photoelectrical coupler U2 is electrically connected with the 8th resistance R 8; Said the 8th resistance R 8 ground connection, the output terminal of corresponding said second detection module 62 of the emitter of the said second photoelectrical coupler U2 also is electrically connected at the secondary signal end FB2 of said control circuit unit 40; Said second rectification unit 621 is the 6th diode D6, and an input end of corresponding said second detection module 62 of said the 6th diode D6 anode also is electrically connected at said the 3rd node KT3; Said second partial pressure unit 622 comprises the 5th resistance R 5 and the 6th resistance R 6; Said the 5th resistance R 5 one ends and the 6th diode D6 negative electrode electrically connect; Said the 5th resistance R 5 other ends and said the 6th resistance R 6 one ends electrically connect, and another input end of corresponding said second detection module 62 of said the 6th resistance R 6 other ends also is electrically connected at said Section Point KT2; Said second filter unit 623 comprises second capacitor C 2, and said second capacitor C 2 is connected in parallel with said the 6th resistance R 6; The said second current limliting unit 624 comprises the 7th resistance R 7, and said the 7th resistance R 7 one ends are electrically connected between said the 5th resistance R 5 and said the 6th resistance R 6, and the anode of said the 7th resistance R 7 other ends and the said second photoelectrical coupler U2 electrically connects.Said the 6th diode D6 also can substitute with full bridge rectifier.
Said drive circuit unit 70 comprises first driver module 71 and second driver module 72; Said first driver module 71 comprises the first chip for driving U3, the 9th resistance R 9, the tenth resistance R 10 and the first triode Q1; The first control end Rly1 of said first chip for driving U3 input end and said control circuit unit 40 electrically connects; Said first chip for driving U3 output terminal and said the 9th resistance R 9 one ends electrically connect; The base stage of said the 9th resistance R 9 other ends and the said first triode Q1 electrically connects; Said the tenth resistance R 10 is electrically connected between the base stage and emitter of the said first triode Q1, and the first input end of the collector of the said first triode Q1 and said relay unit 50 electrically connects.
Said second driver module 72 comprises the second chip for driving U4, the 11 resistance R the 11, the 12 resistance R 12 and the second triode Q2; The second control end Rly2 of said second chip for driving U4 input end and said control circuit unit 40 electrically connects; Said second chip for driving U4 output terminal and said the 11 resistance R 11 1 ends electrically connect; The base stage of said the 11 resistance R 11 other ends and the said second triode Q2 electrically connects; Said the 12 resistance R 12 is electrically connected between the base stage and emitter of the said second triode Q2, and second input end of the collector of the said second triode Q2 and said relay unit 50 electrically connects.
The detection method of a kind of four relays control of the present invention and testing circuit realizes through following steps:
(A), the first control end Rly1 of said control circuit unit 40 and second control end Rly2 output high level represent said relay unit 50 closures, output low level representes that said relay unit 50 breaks off; The first control end Rly1 and the second control end Rly2 of said control circuit unit 40 export a high level signal respectively; Said first driver module 71 and second driver module 72 receive high level signal and control the said first triode Q1 and the second triode Q2 conducting; The control end of the control end of the control end of the control end of said first relay K 1, second relay K 2, the 3rd relay K 3 and the 4th relay K 4 forms path; At this moment, said first relay K 1, second relay K 2, the 3rd relay K 3 and the 4th relay K 4 closures; If said first relay K 1 and second relay K 2 have at least one there be not adhesive, then change step B over to; If said the 3rd relay K 3 and the 4th relay K 4 have at least one there be not adhesive, then change step C over to; If said first relay K 1, second relay K 2, the 3rd relay K 3 and the 4 normal adhesives of the 4th relay K then change step D over to;
(B), said first relay K 1 and second relay K 2 have at least one there be not adhesive; Said first node KT1 can't be communicated with said the 3rd node KT3; Said first detection module 61 can not be communicated with said electrical network 20; Said first detection module 61 can't produce direct supply and supply the said first photoelectrical coupler U1 conducting; The emitter of the said first photoelectrical coupler U1 produces the first signal end FB1 that a low level feeds back signal to said control circuit unit 40, and said control circuit unit 40 receives feedback signal, confirms that said first relay K 1 and second relay K 2 have at least one there be not adhesive;
(C), said the 3rd relay K 3 and the 4th relay K 4 have at least one there be not adhesive; Said Section Point KT2 can't be communicated with said the 4th node KT4; Said second detection module 62 can not be communicated with said electrical network 20; Said second detection module 62 can't produce direct supply and supply the said second photoelectrical coupler U2 conducting; The emitter of the said second photoelectrical coupler U2 produces the secondary signal end FB2 that a low level feeds back signal to said control circuit unit 40, and said control circuit unit 40 receives feedback signal, confirms that said the 3rd relay K 3 and the 4th relay K 4 have at least one there be not adhesive;
(D), said first relay K 1 and the 2 normal adhesives of second relay K; Said first node KT1 electromotive force is identical with said the 3rd node KT3 electromotive force; This moment, said first detection module 61 was through first node KT1 and the 4th node KT4 and 20 electric connections of said electrical network; Said electrical network 20 voltages produce the direct supply of an about 5V after through rectification, dividing potential drop, filtering; The direct supply that produces is through said the 3rd resistance R 3 said first photoelectrical coupler U1 that flows through, the said first photoelectrical coupler U1 conducting, and the emitter of the said first photoelectrical coupler U1 produces the first signal end FB1 that feeds back signal to said control circuit unit 40 of a high level; Said control circuit unit 40 receives feedback signal, confirms said first relay K 1 and the second normally adhesive of relay K 2;
Said the 3rd relay K 3 and the 4 normal adhesives of the 4th relay K; Said Section Point KT2 electromotive force is identical with said the 4th node KT4 electromotive force; This moment, said second detection module 62 was through Section Point KT2 and the 3rd node KT3 and 20 electric connections of said electrical network; Said electrical network 20 voltages produce the direct supply of an about 5V after through rectification, dividing potential drop, filtering; The direct supply that produces is through said the 7th resistance R 7 said second photoelectrical coupler U2 that flows through, the said second photoelectrical coupler U2 conducting, and the emitter of the said second photoelectrical coupler U2 produces the secondary signal end FB2 that feeds back signal to said control circuit unit 40 of a high level; Said control circuit unit 40 receives feedback signal, confirms said the 3rd relay K 3 and the 4th normally adhesive of relay K 4; At this moment, change step e over to;
(E), the first control end Rly1 of said control circuit unit 40 output high level signal; The second control end Rly2 output low level signal of said control circuit unit 40; Said first relay K 1 and the 3rd relay K 3 continue closed, and said second relay K 2 and the 4th relay K 4 are broken off; At this moment, if said second relay K 2 can't be broken off, then change step F over to; If the 4th relay K 4 can't be broken off, then change step G over to; If said second relay K 2 and the 4th relay K 4 all can normally be broken off, then change step H over to;
(F), said second relay K 2 can't be broken off and continued closure; Said first node KT1 is communicated with said the 3rd node KT3; This moment, said first detection module 61 was through first node KT1 and the 4th node KT4 and 20 electric connections of said electrical network; The said first photoelectrical coupler U1 conducting; The emitter of the said first photoelectrical coupler U1 produces the first signal end FB1 that feeds back signal to said control circuit unit 40 of a high level, and said control circuit unit 40 receives feedback signal, confirms that said second relay K 2 can't break off;
(G), said the 4th relay K 4 can't be broken off and continued closure; Said Section Point KT2 is communicated with said the 4th node KT4; This moment, said second detection module 62 was through Section Point KT2 and the 3rd node KT3 and 20 electric connections of said electrical network; The said second photoelectrical coupler U2 conducting; The emitter of the said second photoelectrical coupler U2 produces the secondary signal end FB1 that feeds back signal to said control circuit unit 40 of a high level, and said control circuit unit 40 receives feedback signal, confirms that said the 4th relay K 4 can't break off;
(H), said second relay K 2 and the 4th relay K 4 all can normally be broken off; Said first node KT1 and the 3rd node KT3 can't be communicated with; Section Point KT2 and the 4th node KT4 can't be communicated with; The said first detection module 61 and second detection module 62 all can not be communicated with said electrical network 20; The emitter of the said first photoelectrical coupler U1 produces the first signal end FB1 that a low level feeds back signal to said control circuit unit 40; The emitter of the said second photoelectrical coupler U2 produces the secondary signal end FB2 that a low level feeds back signal to said control circuit unit 40, and said control circuit unit 40 receives feedback signal, confirms that said second relay K 2 and the 4th relay K 4 all can normally break off; At this moment, change step I over to;
(I), the first control end Rly1 output low level signal of said control circuit unit 40; High level signal of second control end Rly2 output of said control circuit unit 40; Said first relay K 1 and the 3rd relay K 3 are broken off said second relay K 2 and the 4th relay K 4 closures; At this moment, if said first relay K 1 can't be broken off, then change step J over to; If the 3rd relay K 3 can't be broken off, then change step K over to; If said first relay K 1 and the 3rd relay K 3 all can normally be broken off, then change step L over to;
(J), said first relay K 1 can't be broken off and continued closure; Said first node KT1 is communicated with said the 3rd node KT3; This moment, said first detection module 61 was through first node KT1 and the 4th node KT4 and 20 electric connections of said electrical network; The said first photoelectrical coupler U1 conducting; The emitter of the said first photoelectrical coupler U1 produces the first signal end FB1 that feeds back signal to said control circuit unit 40 of a high level, and said control circuit unit 40 receives feedback signal, confirms that said first relay K 1 can't break off;
(K), said the 3rd relay K 3 can't be broken off and continued closure; Said Section Point KT2 is communicated with said the 4th node KT4; This moment, said second detection module 62 was through Section Point KT2 and the 3rd node KT3 and 20 electric connections of said electrical network; The said second photoelectrical coupler U2 conducting; The emitter of the said second photoelectrical coupler U2 produces the secondary signal end FB2 that feeds back signal to said control circuit unit 40 of a high level, and said control circuit unit 40 receives feedback signal, confirms that said the 3rd relay K 3 can't break off;
(L), said first relay K 1 and the 3rd relay K 3 all can normally be broken off; Said first node KT1 and the 3rd node KT3 can't be communicated with; Section Point KT2 and the 4th node KT4 can't be communicated with; The said first detection module 61 and second detection module 62 all can not be communicated with said electrical network 20; The emitter of the said first photoelectrical coupler U1 produces the first signal end FB1 that a low level feeds back signal to said control circuit unit 40; The emitter of the said second photoelectrical coupler U2 produces the secondary signal end FB2 that a low level feeds back signal to said control circuit unit 40, and said control circuit unit 40 receives feedback signal, confirms that said first relay K 1 and the 3rd relay K 3 all can normally break off; The relay fault detect finishes.
The present invention both can also can be in the course of the work before inverter is incorporated into the power networks; As required said first relay K 1, second relay K 2, the 3rd relay K 3 and the 4th relay K 4 are carried out online detection, guarantee that said first relay K 1, second relay K 2, the 3rd relay K 3 and the 4th relay K 4 are in normal condition.
In sum; A kind of four relay controls of the present invention and testing circuit and detection method thereof are through being provided with first node KT1, Section Point KT2, the 3rd node KT3 and the 4th node KT4; And send signal through the first detection module 61 and second detection module 62 and give control circuit unit 40; At any time relay unit 50 is carried out fault detect as required, guarantee that first relay K 1, second relay K 2, the 3rd relay K 3 and the 4th relay K 4 are in normal condition, flexible method; Simple in structure, convenient enforcement.
The above embodiment has only expressed one embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as limitation of the scope of the invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with accompanying claims.
Claims (10)
1. four relays are controlled and testing circuit; Comprise inverter unit (10), electrical network (20) and relay unit (50); Said relay unit (50) is electrically connected between said inverter unit (10) and the electrical network (20); Said relay unit (50) comprises first relay (K1), second relay (K2), the 3rd relay (K3) and the 4th relay (K4); Said first relay (K1) is connected in series with said second relay (K2); Said the 3rd relay (K3) is connected in series with said the 4th relay (K4); It is characterized in that: also comprise power circuit unit (30), control circuit unit (40), testing circuit unit (60) and drive circuit unit (70); Said power circuit unit (30) is that said relay unit (50), testing circuit unit (60), drive circuit unit (70) and control circuit unit (40) provide power supply, and said control circuit unit (40) is provided with first signal end (FB1), secondary signal end (FB2), first control end (Rly1) and second control end (Rly2); Be provided with first node (KT1) between first output terminal of said relay unit (50) and said inverter unit (10); Be provided with Section Point (KT2) between second output terminal of said relay unit (50) and said inverter unit (10); Be provided with the 3rd node (KT3) between the first input end of said relay unit (50) and said electrical network (20), be provided with the 4th node (KT4) between second input end of said relay unit (50) and said electrical network (20); Said testing circuit unit (60) comprises first detection module (61) and second detection module (62); Said first detection module (61) input end is electrically connected at said first node (KT1) and the 4th node (KT4); Said second detection module (62) input end is electrically connected at said the 3rd node (KT3) and Section Point (KT2); The output terminal of said first detection module (61) is electrically connected at said first signal end (FB1), and the output terminal of said second detection module (62) is electrically connected at said secondary signal end (FB2); Said drive circuit unit (70) comprises first driver module (71) and second driver module (72); Said first driver module (71) input end and said first control end (Rly1) electrically connect; Said second driver module (72) input end and said second control end (Rly2) electrically connect; Said first driver module (71) output terminal electrically connects said first relay (K1) and the 3rd relay (K3) control end, and said second driver module (72) output terminal electrically connects said second relay (K2) and the 4th relay (K4) control end.
2. a kind of four relays control according to claim 1 and testing circuit; It is characterized in that: said first detection module (61) comprises first rectification unit (611), first partial pressure unit (612), first filter unit (613), the first current limliting unit (614) and the first isolated feedback unit (615), and said first rectification unit (611), first partial pressure unit (612), first filter unit (613), the first current limliting unit (614) and the first isolated feedback unit (615) electrically connect successively; Said second detection module (62) comprises second rectification unit (621), second partial pressure unit (622), second filter unit (623), the second current limliting unit (624) and the second isolated feedback unit (625), and said second rectification unit (621), second partial pressure unit (622), second filter unit (623), the second current limliting unit (624) and the second isolated feedback unit (625) electrically connect successively.
3. a kind of four relays control according to claim 2 and testing circuit; It is characterized in that: the said first isolated feedback unit (615) is first photoelectrical coupler (U1); The collector of said first photoelectrical coupler (U1) is electrically connected at said power circuit unit; The emitter of said first photoelectrical coupler (U1) is electrically connected with the 4th resistance (R4); Said the 4th resistance (R4) ground connection, the emitter of said first photoelectrical coupler (U1) are electrically connected at first signal end (FB1) of said control circuit unit (40); Said first rectification unit (611) is the 5th diode (D5), and said the 5th diode (D5) anode correspondence is electrically connected at said first node (KT1); Said first partial pressure unit (612) comprises first resistance (R1) and second resistance (R2); Said first resistance (R1) end and the 5th diode (D5) negative electrode electrically connect; Said first resistance (R1) other end and said second resistance (R2) end electrically connect, and said second resistance (R2) other end correspondence is electrically connected at said the 4th node (KT4); Said first filter unit (613) comprises first electric capacity (C1), and said first electric capacity (C1) is connected in parallel with said second resistance (R2); The said first current limliting unit (614) comprises the 3rd resistance (R3); Said the 3rd resistance (R3) end is electrically connected between said first resistance (R1) and said second resistance (R2), and the anode of said the 3rd resistance (R3) other end and said first photoelectrical coupler (U1) electrically connects.
4. a kind of four relays control according to claim 3 and testing circuit, it is characterized in that: said the 5th diode (D5) substitutes with full bridge rectifier.
5. a kind of four relays control according to claim 2 and testing circuit; It is characterized in that: the said second isolated feedback unit (625) is second photoelectrical coupler (U2); The collector of said second photoelectrical coupler (U2) is electrically connected at said power circuit unit (30); The emitter of said second photoelectrical coupler (U2) is electrically connected with the 8th resistance (R8); Said the 8th resistance (R8) ground connection, the emitter of said second photoelectrical coupler (U2) are electrically connected at the secondary signal end (FB2) of said control circuit unit (40); Said second rectification unit (621) is the 6th diode (D6), and said the 6th diode (D6) anode correspondence is electrically connected at said the 3rd node (KT3); Said second partial pressure unit (622) comprises the 5th resistance (R5) and the 6th resistance (R6); Said the 5th resistance (R5) end and the 6th diode (D6) negative electrode electrically connect; Said the 5th resistance (R5) other end and said the 6th resistance (R6) end electrically connect, and said the 6th resistance (R6) other end correspondence is electrically connected at said Section Point (KT2); Said second filter unit (623) comprises second electric capacity (C2), and said second electric capacity (C2) is connected in parallel with said the 6th resistance (R6); The said second current limliting unit (624) comprises the 7th resistance (R7); Said the 7th resistance (R7) end is electrically connected between said the 5th resistance (R5) and said the 6th resistance (R6), and the anode of said the 7th resistance (R7) other end and said second photoelectrical coupler (U2) electrically connects.
6. a kind of four relays control according to claim 5 and testing circuit, it is characterized in that: said the 6th diode (D6) substitutes with full bridge rectifier.
7. a kind of four relays control according to claim 1 and testing circuit, it is characterized in that: a control end of a control end of a control end of said first relay (K1), said second relay (K2), a control end of said the 3rd relay (K3) and said the 4th relay (K4) electrically connects with power circuit unit (30) respectively; Another control end of another control end of said first relay (K1) and said the 3rd relay (K3) electrically connects, and the first input end of corresponding said relay unit (50); Another control end of another control end of said second relay (K2) and said the 4th relay (K4) electrically connects; And second input end of corresponding said relay unit (50); Said first driver module (71) output terminal electrically connects the first input end of said relay unit (50), and said second driver module (72) output terminal electrically connects second input end of said relay unit (50).
8. a kind of four relays control according to claim 7 and testing circuit; It is characterized in that: said first driver module (71) comprises first chip for driving (U3), the 9th resistance (R9), the tenth resistance (R10) and first triode (Q1); First control end (Rly1) of said first chip for driving (U3) input end and said control circuit unit (40) electrically connects; Said first chip for driving (U3) output terminal and said the 9th resistance (R9) end electrically connect; The base stage of said the 9th resistance (R9) other end and said first triode (Q1) electrically connects; Said the tenth resistance (R10) is electrically connected between the base stage and emitter of said first triode (Q1), and the first input end of the collector of said first triode (Q1) and said relay unit (50) electrically connects; Said second driver module (72) comprises second chip for driving (U4), the 11 resistance (R11), the 12 resistance (R12) and second triode (Q2); Second control end (Rly2) of said second chip for driving (U4) input end and said control circuit unit (40) electrically connects; Said second chip for driving (U4) output terminal and said the 11 resistance (R11) end electrically connect; The base stage of said the 11 resistance (R11) other end and said second triode (Q2) electrically connects; Said the 12 resistance (R12) is electrically connected between the base stage and emitter of said second triode (Q2), and second input end of the collector of said second triode (Q2) and said relay unit (50) electrically connects.
9. a kind of four relays control according to claim 1 and testing circuit; It is characterized in that: the control end of said first relay (K1) is connected in parallel to first diode (D1); The control end of said second relay (K2) is connected in parallel to second diode (D2); The control end of said the 3rd relay (K3) is connected in parallel to the 3rd diode (D3), and the control end of said the 4th relay (K4) is connected in parallel to the 4th diode (D4).
10. according to the control method of described a kind of four relays control of claim 1 ~ 9 and testing circuit, it is characterized in that, comprise the steps:
(A), first control end (Rly1) of said control circuit unit (40) and second control end (Rly2) are exported a high level signal respectively; Said first driver module (71) and second driver module (72) receive high level signal, said first relay (K1), second relay (K2), the 3rd relay (K3) and the 4th relay (K4) closure; If said first relay (K1) and second relay (K2) have at least one not have adhesive, then change step B over to; If said the 3rd relay (K3) and the 4th relay (K4) have at least one not have adhesive, then change step C over to; If the normal adhesive of said first relay (K1), second relay (K2), the 3rd relay (K3) and the 4th relay (K4) then changes step D over to;
(B), said first node (KT1) can't be communicated with said the 3rd node (KT3); Said first detection module (61) sends first signal end (FB1) that low level feeds back signal to said control circuit unit (40); Said control circuit unit (40) receives feedback signal, confirms that said first relay (K1) and second relay (K2) have at least one not have adhesive;
(C), said Section Point (KT2) can't be communicated with said the 4th node (KT4); Said second detection module (62) sends the secondary signal end (FB2) that low level feeds back signal to said control circuit unit (40); Said control circuit unit (40) receives feedback signal, confirms that said the 3rd relay (K3) and the 4th relay (K4) have at least one not have adhesive;
(D), said first node (KT1) is communicated with said the 3rd node (KT3); Said first detection module this moment (61) electrically connects with said electrical network (20) through first node (KT1) and the 4th node (KT4); Said first detection module (61) sends first signal end (FB1) that feeds back signal to said control circuit unit (40) of high level; Said control circuit unit (40) receives feedback signal, confirms the normally adhesive of said first relay (K1) and second relay (K2);
Said Section Point (KT2) is communicated with said the 4th node (KT4); Said second detection module this moment (62) electrically connects with said electrical network (20) through Section Point (KT2) and the 3rd node (KT3); Said second detection module (62) sends the secondary signal end (FB2) that feeds back signal to said control circuit unit (40) of high level; Said control circuit unit (40) receives feedback signal, confirms the normally adhesive of said the 3rd relay (K3) and the 4th relay (K4); At this moment, change step e over to;
(E), first control end (Rly1) of said control circuit unit (40) output high level signal; Second control end (Rly2) the output low level signal of said control circuit unit (40); Said first relay (K1) and the 3rd relay (K3) continue closed, and said second relay (K2) and the 4th relay (K4) break off; At this moment, if said second relay (K2) can't break off, then change step F over to; If the 4th relay (K4) can't break off, then change step G over to; If said second relay (K2) and the 4th relay (K4) all can normally break off, then change step H over to;
(F), said first node (KT1) is communicated with said the 3rd node (KT3); Said first detection module this moment (61) electrically connects with said electrical network (20) through first node (KT1) and the 4th node (KT4); Said first detection module (61) sends first signal end (FB1) that feeds back signal to said control circuit unit (40) of high level; Said control circuit unit (40) receives feedback signal, confirms that said second relay (K2) can't break off;
(G), said Section Point (KT2) is communicated with said the 4th node (KT4); Said second detection module this moment (62) electrically connects with said electrical network (20) through Section Point (KT2) and the 3rd node (KT3); Said second detection module (62) sends the secondary signal end FB1 that feeds back signal to said control circuit unit (40) of high level; Said control circuit unit (40) receives feedback signal, confirms that said the 4th relay (K4) can't break off;
(H), said first node (KT1) and the 3rd node (KT3) can't be communicated with; Section Point (KT2) and the 4th node (KT4) can't be communicated with; Said first detection module (61) and second detection module (62) all can not be communicated with said electrical network (20); Said first detection module (61) sends first signal end (FB1) that low level feeds back signal to said control circuit unit (40); Said second detection module (62) sends the secondary signal end (FB2) that low level feeds back signal to said control circuit unit (40); Said control circuit unit (40) receives feedback signal, confirms that said second relay (K2) and the 4th relay (K4) all can normally break off; At this moment, change step I over to;
(I), first control end (Rly1) the output low level signal of said control circuit unit (40); High level signal of second control end (Rly2) output of said control circuit unit (40); Said first relay (K1) and the 3rd relay (K3) break off, said second relay (K2) and the 4th relay (K4) closure; At this moment, if said first relay (K1) can't break off, then change step J over to; If the 3rd relay (K3) can't break off, then change step K over to; If said first relay (K1) and the 3rd relay (K3) all can normally break off, then change step L over to;
(J), said first node (KT1) is communicated with said the 3rd node (KT3); Said first detection module this moment (61) electrically connects with said electrical network (20) through first node (KT1) and the 4th node (KT4); Said first detection module (61) sends first signal end (FB1) that feeds back signal to said control circuit unit (40) of high level; Said control circuit unit (40) receives feedback signal, confirms that said first relay (K1) can't break off;
(K), said Section Point (KT2) is communicated with said the 4th node (KT4); Said second detection module this moment (62) electrically connects with said electrical network (20) through Section Point (KT2) and the 3rd node (KT3); Said second detection module (62) sends the secondary signal end (FB2) that feeds back signal to said control circuit unit (40) of high level; Said control circuit unit (40) receives feedback signal, confirms that said the 3rd relay (K3) can't break off;
(L), said first node (KT1) and the 3rd node (KT3) can't be communicated with; Section Point (KT2) and the 4th node (KT4) can't be communicated with; Said first detection module (61) and second detection module (62) all can not be communicated with said electrical network (20); Said first detection module (61) sends first signal end (FB1) that low level feeds back signal to said control circuit unit (40); Said second detection module (62) sends the secondary signal end (FB2) that low level feeds back signal to said control circuit unit (40); Said control circuit unit (40) receives feedback signal, confirms that said first relay (K1) and the 3rd relay (K3) all can normally break off; The relay fault detect finishes.
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| CN105259500A (en) * | 2015-10-30 | 2016-01-20 | 上能电气股份有限公司 | Method for detecting fault in relay of three-level grid-connected converter |
| CN105259500B (en) * | 2015-10-30 | 2018-02-13 | 上能电气股份有限公司 | A kind of relay fault detection method of three level grid-connection converter |
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| CN105609370B (en) * | 2015-12-28 | 2018-05-08 | 济宁科力光电产业有限责任公司 | More relay output sync detection circuits and synchronization adjustment method |
| CN106207957A (en) * | 2016-07-27 | 2016-12-07 | 浪潮（苏州）金融技术服务有限公司 | A kind of supply unit to Possum load current-limiting protection and method |
| CN109557462A (en) * | 2017-09-22 | 2019-04-02 | B和R工业自动化有限公司 | Handoff-security equipment |
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| CN109859988B (en) * | 2017-11-30 | 2020-05-08 | 株洲中车时代电气股份有限公司 | Relay control circuit |
| CN108761319A (en) * | 2018-04-08 | 2018-11-06 | 阳光电源股份有限公司 | Relay failure detection method, device and the system of photovoltaic combining inverter |
| CN108761319B (en) * | 2018-04-08 | 2020-08-28 | 阳光电源股份有限公司 | Relay failure detection method, device and system for photovoltaic grid-connected inverter |
| CN112924855A (en) * | 2019-12-06 | 2021-06-08 | 苏州阿特斯阳光电力科技有限公司 | Grid-connected relay circuit |
| CN112924855B (en) * | 2019-12-06 | 2023-01-31 | 苏州阿特斯阳光电力科技有限公司 | Grid-connected relay circuit |
| CN114137405A (en) * | 2021-11-25 | 2022-03-04 | 沃太能源股份有限公司 | Fault detection method for relay device and device thereof |
| WO2023130522A1 (en) * | 2022-01-10 | 2023-07-13 | 浙江英达威芯电子有限公司 | Shutdown device detection and control method, and detector |
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