CN102957199A - Dual-power safety switching circuit - Google Patents
Dual-power safety switching circuit Download PDFInfo
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- CN102957199A CN102957199A CN2011102447321A CN201110244732A CN102957199A CN 102957199 A CN102957199 A CN 102957199A CN 2011102447321 A CN2011102447321 A CN 2011102447321A CN 201110244732 A CN201110244732 A CN 201110244732A CN 102957199 A CN102957199 A CN 102957199A
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Abstract
The invention relates to a dual-power safety switching circuit. The dual-power safety switching circuit comprises two power supply loops, a backup switch, a total current operation unit and a control unit, wherein the two power supply loops are respectively provided with a switch, a current detector is arranged on an upstream side of each switch of each power supply loops and is electrically connected with a first protection relay and a second protection relay; the backup switch is parallelly connected with downstream output of the switches of the two power supply loops; the total current operation unit is electrically connected with the current detector; and the control unit is electrically connected with the first protection relay and the second protection relay and is electrically connected with the switches and the backup switch in a control manner. The dual-power safety switching circuit can save equipment cost and synchronously detect current of the power supply loops and can avoid switching and power cutoff by mistake due to faults of a single protection relay.
Description
Technical field
The present invention relates to a kind of power supply circuits, particularly a kind of duplicate supply handoff-security circuit.
Background technology
Please refer to shown in Figure 1, Dual-power switching system main supply electricity loop 91 is all only by the electric post 95 of protection now, the voltage that detects main supply electricity loop 91 turns the foundation that power supply is judged, if voltage module or the voltage-sensor 951 of the electric post 95 of single protection break down in running, protect the conducting of the derailing switch 96 that the i.e. cut-off of electric post 95 itself controls, make main supply electricity loop 91 be absorbed in the situation of mistakenly stop electricity; Dual-power switching system also has switching circuit to turn the function of power supply in addition; when stop power supply in generation main supply electricity loop 91; can turn by secondary current supply circuit 92 supply electric power; count on the AC Bus of shunt loading 911 in 91 downstreams if right short trouble betides main supply electricity loop; meet again the electric post of protection 95 faults own; have little time to suppress to turn power supply; when namely switching by secondary current supply circuit 92 power supply before then allowing short trouble not get rid of; secondary current supply circuit 92 a plurality of loads 921 own also can turn the power supply inefficacy because short trouble makes; the electric post 95 of above-mentioned single protection causes the bulk supply system and produces situation about comprehensively having a power failure, so can't provide Dual-power switching system to judge reliably the failure condition of current supply circuit.
Summary of the invention
Technical problem to be solved by this invention is to be to provide a kind of duplicate supply handoff-security circuit; detect voltage and current signal to overcome only transmitting by the electric post of single protection of existing power supply switched system; judge the supply of electric power situation in loop; Yi Yin protects the inner detection module in electric post own or the fault of output module, causes the shortcoming of mistake switching or mistakenly stop electricity.
For reaching aforementioned purpose of the present invention, the technical solution used in the present invention provides a kind of duplicate supply handoff-security circuit, described duplicate supply handoff-security circuit includes: two current supply circuits, described current supply circuit is provided with a derailing switch, the upstream side of the described derailing switch of described current supply circuit is provided with a current detector, and described current detector is electrically connected with the one first electric post of protection and the electric post of one second protection; One supports switch, is the support switch of the downstream output of the described derailing switch of two described current supply circuits in parallel; One control unit, described control unit are electrically connected described the first electric post of protection and the electric post of described the second protection, and described control unit control is electrically connected described derailing switch and described support switch.
Further, duplicate supply handoff-security circuit of the present invention, also include a total current arithmetic element, described total current arithmetic element is electrically connected the described current detector of two described current supply circuits, the total current signal that described total current arithmetic element transmits two described current supply circuits to the described control unit of its electric connection.
Further, duplicate supply handoff-security circuit of the present invention, the electric post of described the second protection also is electrically connected the voltage detector of the described derailing switch of detection downstream voltage.
Further; duplicate supply handoff-security circuit of the present invention; the described derailing switch upstream of described current supply circuit also is provided with an earth fault current detector, and described earth fault current detector is electrically connected described the first electric post of protection and the electric post of described the second protection.
The present invention adopts another technical scheme to provide a kind of duplicate supply handoff-security circuit, described duplicate supply handoff-security circuit includes: two current supply circuits, described current supply circuit is provided with a derailing switch, and the upstream side of the described derailing switch of described current supply circuit is provided with a current detector; One supports switch, is the support switch of the described derailing switch downstream output of two described current supply circuits in parallel; One control unit, described control unit control is electrically connected described derailing switch and described support switch; One total current arithmetic element, described total current arithmetic element is electrically connected the described current detector of two described current supply circuits, and described total current arithmetic element transmits the total current signal of two described current supply circuits to the described control unit that is electrically connected.
Another technical scheme of the present invention, further, duplicate supply handoff-security circuit of the present invention, described current detector are electrically connected with the one first electric post of protection and the electric post of one second protection.
Another technical scheme of the present invention, further, duplicate supply handoff-security circuit of the present invention, described the first electric post of protection and the electric post of described the second protection transmit detection signal to the control unit of its electric connection.
Another technical scheme of the present invention, further, duplicate supply handoff-security circuit of the present invention, the electric post of described the second protection also is electrically connected a voltage detector that detects described derailing switch downstream voltage.
Another technical scheme of the present invention; further; duplicate supply handoff-security circuit of the present invention; the described derailing switch upstream of described current supply circuit also is provided with an earth fault current detector, and described earth fault current detector is electrically connected described the first electric post of protection and the electric post of described the second protection.
By technique scheme, the present invention has following advantages at least compared to prior art:
1. the electric post of the present invention first protection, the second electric post of protection and total current arithmetic element connect single current detector, can save equipment cost and can reach the electric current of synchronous detection current supply circuit.
2. the present invention first electric post of protection and the electric post of the second protection provide the control unit detection signal simultaneously, can avoid single protection electric post fault and cause the mistake of current supply circuit to switch and the mistakenly stop electricity.
3. total current arithmetic element of the present invention can add up the power consumption of two current supply circuits, whether surpasses margin of safety own for automatic decision power supply unit before turning power supply, and the personnel careless mistake of avoiding causes the accident of comprehensive power failure.
Description of drawings
Fig. 1 is known Dual-power switching system electric power-feeding structure figure.
Fig. 2 is duplicate supply handoff-security circuit supply structure chart of the present invention.
Fig. 3 is the electrical block diagram of one embodiment of the invention.
Fig. 4 is the electrical block diagram of another embodiment of the present invention.
Fig. 5 is the electrical block diagram of yet another embodiment of the invention.
Fig. 6 is the electrical block diagram of further embodiment of this invention.
Embodiment
Please refer to Fig. 2 and shown in Figure 3, duplicate supply handoff-security circuit of the present invention includes:
Two current supply circuits 8; described current supply circuit 8 is provided with a derailing switch 1; in order to control the power supply of current supply circuit 8; described derailing switch 1 downstream of described current supply circuit 8 is provided with the load bus-bar 82 (AC Bus) that connects a plurality of loads 81; described derailing switch 1 upstream side of described current supply circuit 8 is provided with a current detector 2 and an earth fault current detector 21; described current detector 2 is electrically connected with the one first electric post 4 of protection and the electric post 5 of one second protection; the electric post 4 of described the first protection connects the upstream side voltage of the described derailing switch 1 that detects described current supply circuit 8 by a voltage detector that is electrically connected 3; the electric post 5 of described the second protection connects the voltage of the load bus-bar 82 (AC Bus) that detects described current supply circuit 8 by a voltage detector that is electrically connected 3; described earth fault current detector 21 is electrically connected described the first electric post 4 of protection and the electric post 5 of described the second protection, can provide the earth fault current to described current supply circuit 8 high sensitivities to detect.
One supports switch 6, and the support switch 6 for this load bus-bar 82 (AC Bus) of the described derailing switch 1 downstream output of two current supply circuits 8 in parallel is used for the power switching between two current supply circuits 8.
One total current arithmetic element 7, described total current arithmetic element 7 is electrically connected described current detector 2, but computing detects the total current of two current supply circuits 8.
One control unit 9; described control unit 9 is electrically connected described the first electric post 4 of protection and the electric post 5 of described the second protection; receive the voltage and current signal of the current supply circuit 8 that transmits in described the first electric post 4 of protection and the electric post 5 of described the second protection; described control unit 9 is electrically connected described total current arithmetic element 7; receive the total current signal that described total current arithmetic element 7 transmits; described control unit 9 is electrically connected described derailing switch 1 and described support switch 6; judge control switch device 1 and support the action of switch 6 through computing; to reach the power supply that turns of control two current supply circuits 8; whether described control unit 9 is electrically connected described voltage detector 3, synchronous in order to the power supply that detects two current supply circuits 8.
The above-mentioned electric post 4 of the first protection, the second electric post 5 of protection and total current arithmetic element 7 are electrically connected single current detector 2; can reach the electric current of synchronous detection current supply circuit 8; do not need to set up in addition again the element that detects electric current, can reduce the cost of hardware investment.
Please refer to Fig. 2 and shown in Figure 3, the present invention is before turning power supply, and control unit 9 need confirm first whether the power supply of two current supply circuits 8 is synchronous, and whether the total current of total current arithmetic element 7 detections can cause the overload of single current supply circuit 8; The present invention utilizes the first electric post 4 of protection and the electric post 5 of the second protection; needing all provides the voltage condition of current supply circuit 8 to control unit 9 simultaneously; to avoid the voltage detection module fault of the first electric post 4 of protection or the electric post of the second protection 5 one; cause control unit 9 erroneous judgement current supply circuits 8 to have a power failure; and cutoff switch device 1 is powered, and causes the loss of outage of downstream load 81.In addition; the electric post 5 of the first electric post 4 of protection and the second protection uses same current detector 2 to detect electric current; 9 need of control unit receive the current signal of one can differentiate derailing switch 1 downstream generation overcurrent fault; and forbid that conducting supports the power supply that turns of switch 6, improve the reliability that fault is judged.
For the electrical source exchange between two current supply circuits 8 is described; please refer to shown in Figure 2; described control unit 9 can be by the electric post 4 of the first protection, the second voltage, current detection signal of protecting electric post 5 to provide; failure judgement is to occur in the downstream of derailing switch 1 or the upstream side of derailing switch 1; when if fault occurs in derailing switch 1 downstream; then can not support power supply by conducting support switch 6 another current supply circuits 8 of switching; do not get rid of because of derailing switch 1 downstream fault avoiding, cause to turn after the power supply risk that comprehensively power supply was lost efficacy.If the derailing switch of current supply circuit 81 upstream side abnormal electrical power supply or power supply unit fault namely carry out this derailing switch 1 of cut-off after control unit 9 judgements, and confirm that derailing switch 1 has been cut-off state, but just conducting support switch 6 are sent a telegram in reply by another current supply circuit 8.
Please refer to shown in Figure 2; total current arithmetic element 7 of the present invention detects the total current of two current supply circuits 8 and provides signal to control unit 9; make control unit 9 in two current supply circuits 8 carry out turn power supply before; can judge in advance whether load 81 electricity consumptions of two current supply circuits 8 surpass the margin of safety of power supply unit; effectively to avoid owing to personnel's careless mistake, do not notice that the situations that cause load 81 comprehensively to have a power failure are namely switched in the crisis of current supply circuit 8 potential overloads.
Please refer to Fig. 3～shown in Figure 6, earth fault current detector 21 of the present invention can arrange according to the power supply unit demand of current supply circuit 8, can provide the earth fault current of current supply circuit 8 high sensitivities to detect.
Claims (9)
1. duplicate supply handoff-security circuit, it is characterized in that, comprise: two current supply circuits (8), described current supply circuit (8) is provided with a derailing switch (1), the upstream side of the described derailing switch (1) of described current supply circuit (8) is provided with a current detector (2), and described current detector (2) is electrically connected with one first protection electric post (4) and one second protection electric post (5); One supports switch (6), is the support switch (6) of the downstream output of the described derailing switch (1) of two described current supply circuits (8) in parallel; An and control unit (9); described control unit (9) is electrically connected described the first protection electric post (4) and described the second protection electric post (5), and described control unit (9) is electrically connected described derailing switch (1) and described support switch (6).
2. duplicate supply handoff-security circuit according to claim 1, it is characterized in that, also include a total current arithmetic element (7), described total current arithmetic element (7) is electrically connected the described current detector (2) of two described current supply circuits (8), the total current signal that described total current arithmetic element (7) transmits two described current supply circuits (8) to the described control unit (9) of its electric connection.
3. duplicate supply handoff-security circuit according to claim 1 is characterized in that, described the second electric post of protection (5) also is electrically connected the voltage detector (3) of detection described derailing switch (a 1) downstream voltage.
4. duplicate supply handoff-security circuit according to claim 1; it is characterized in that; described derailing switch (1) upstream of described current supply circuit (8) also is provided with an earth fault current detector (21), and described earth fault current detector (21) is electrically connected described the first protection electric post (4) and described the second protection electric post (5).
5. duplicate supply handoff-security circuit, it is characterized in that, comprise: two current supply circuits (8), described current supply circuit (8) is provided with a derailing switch (1), and the upstream side of the described derailing switch (1) of described current supply circuit (8) is provided with a current detector (2); One supports switch (6), is the support switch (6) of the downstream output of the described derailing switch (1) of two described current supply circuits (8) in parallel; One control unit (9), described control unit (9) are electrically connected described derailing switch (1) and described support switch (6); An and total current arithmetic element (7), described total current arithmetic element (7) is electrically connected the described current detector (2) of two described current supply circuits (8), and described total current arithmetic element (7) transmits the total current signal of two described current supply circuits (8) to the described control unit (9) that is electrically connected.
6. duplicate supply handoff-security circuit according to claim 5 is characterized in that, described current detector (2) is electrically connected with one first protection electric post (4) and one second protection electric post (5).
7. duplicate supply handoff-security circuit according to claim 6 is characterized in that, described the first protection electric post (4) and described the second electric post of protection (5) transmit detection signal to the described control unit (9) of its electric connection.
8. duplicate supply handoff-security circuit according to claim 6 is characterized in that, described the second electric post of protection (5) also is electrically connected the voltage detector (3) of detection described derailing switch (a 1) downstream voltage.
9. duplicate supply handoff-security circuit according to claim 6; it is characterized in that; described derailing switch (1) upstream of described current supply circuit (8) also is provided with an earth fault current detector (21), and described earth fault current detector (21) is electrically connected described the first protection electric post (4) and described the second protection electric post (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102447321A CN102957199A (en) | 2011-08-18 | 2011-08-18 | Dual-power safety switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102447321A CN102957199A (en) | 2011-08-18 | 2011-08-18 | Dual-power safety switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102957199A true CN102957199A (en) | 2013-03-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102447321A Pending CN102957199A (en) | 2011-08-18 | 2011-08-18 | Dual-power safety switching circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149389A (en) * | 2018-09-14 | 2019-01-04 | 广东电网有限责任公司 | Ground connection becomes automatic switching method and device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030023888A1 (en) * | 2001-07-30 | 2003-01-30 | Smith Robert B. | Loadshedding uninterruptible power supply |
| CN201146405Y (en) * | 2008-01-17 | 2008-11-05 | 孙毅彪 | Intelligent double power supply road-changing device |
| CN101752898A (en) * | 2009-12-30 | 2010-06-23 | 上海天健电气有限公司 | Controller for controlling double-power circuit |
| CN201733129U (en) * | 2010-06-29 | 2011-02-02 | 河南省电力公司许昌供电公司 | Multifunctional double-load double-power automatic switching control device |
| CN202218061U (en) * | 2011-08-18 | 2012-05-09 | 王丕忠 | Dual power safe switching device |
-
2011
- 2011-08-18 CN CN2011102447321A patent/CN102957199A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030023888A1 (en) * | 2001-07-30 | 2003-01-30 | Smith Robert B. | Loadshedding uninterruptible power supply |
| CN201146405Y (en) * | 2008-01-17 | 2008-11-05 | 孙毅彪 | Intelligent double power supply road-changing device |
| CN101752898A (en) * | 2009-12-30 | 2010-06-23 | 上海天健电气有限公司 | Controller for controlling double-power circuit |
| CN201733129U (en) * | 2010-06-29 | 2011-02-02 | 河南省电力公司许昌供电公司 | Multifunctional double-load double-power automatic switching control device |
| CN202218061U (en) * | 2011-08-18 | 2012-05-09 | 王丕忠 | Dual power safe switching device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109149389A (en) * | 2018-09-14 | 2019-01-04 | 广东电网有限责任公司 | Ground connection becomes automatic switching method and device |
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Application publication date: 20130306 |