CN103091542A - Voltage detection circuit capable of automatically transferring switch - Google Patents
Voltage detection circuit capable of automatically transferring switch Download PDFInfo
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- CN103091542A CN103091542A CN2012105968946A CN201210596894A CN103091542A CN 103091542 A CN103091542 A CN 103091542A CN 2012105968946 A CN2012105968946 A CN 2012105968946A CN 201210596894 A CN201210596894 A CN 201210596894A CN 103091542 A CN103091542 A CN 103091542A
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Abstract
The invention relates to a voltage detection circuit capable of automatically transferring a switch. A voltage sampling circuit comprises followers of U1A-U1D and U2A-U2D. Phase lines of A1-N1 and A2-N2 are respectively accessed to input ports of the followers of U1A-U1D and U2A-U2D through resistor strings of R1R2, R3R4, R5R6, R21R22, R7R10, R8R11, R9R12 and R23R24; input ports of the followers of U1A-U1D and U2A-U2D are respectively accessed to a direct-current power supply VCC through first diodes of D1, D3, D5, D7, D9, D11, D13 and D15; input ports of the followers of the U1A-U1D and the U2A-U2D and the ground are accessed to second diodes of D2, D4, D6, D8, D10, D12, D14,and D16 in an inverted and parallel mode; and the input ports of the followers of the U1A-U1D and the U2A-U2D are further accessed to direct current reference voltage Vref through resistors of R13-R20. First, voltage of three-phase power of a frequently-used power supply and three-phase power of a reserve power supply are divided and the direct current reference voltage is stacked, then the three-phase power of the frequently-used power supply and the three-phase power of the reserve power supply are accessed to the input ports of the follower, and therefore a signal sampling circuit and a post computing control circuit are mutually separated, the post computing control circuit is protected and meanwhile effect of transmission of useful signals is also improved.
Description
Technical field
The present invention relates to a kind of voltage detecting circuit of automatic change over.
Background technology
Automatic transfer switch controller must be monitored standby each other power supply three-phase electricity commonly used and the three-phase electricity of standby power supply, thus the disengagement failure circuit, and adopting the normal stable circuit of parameters of electric power is the consumer power supply.In prior art, the voltage detecting circuit of automatic change over enters signal processing circuit after generally adopting voltage transformer (VT) step-down or light-coupled isolation, because the volume of voltage transformer (VT) is larger, cost is high, and the electrical characteristics temperature influence of optocoupler is larger, and Monitoring Data often can not accurately reflect the actual value of power supply commonly used and standby power supply, cause the control error of automatic change over, consumer can not move under normal electric power environmental, particularly seriously, also can damage consumer.
Summary of the invention
The object of the invention is to overcome the defective of prior art, provide a kind of and need not to adopt optocoupler or voltage transformer (VT) to carry out signal isolation can accurately to detect, the voltage detecting circuit of security of operation, stable automatic change over.
for achieving the above object, the present invention adopts a kind of like this voltage detecting circuit of automatic change over, comprise power supply three-phase electricity commonly used and standby power supply three-phase electricity, through the arithmetic control circuit of corresponding three-phase voltage sample circuit access rear class, described voltage sampling circuit comprises follower U1A respectively for described power supply three-phase electricity commonly used and described standby power supply three-phase electricity, U1B, U1C, U1D, U2A, U2B, U2C, U2D, phase line A1, B1, C1, N1, A2, B2, C2, N2 is respectively through resistance string R1R2, R3R4, R5R6, R21R22, R7R10, R8R11, R9R12, R23R24 accesses described follower U1A, U1B, U1C, U1D, U2A, U2B, U2C, the input end of U2D, described follower U1A, U1B, U1C, U1D, U2A, U2B, U2C, the input end of U2D is respectively through the first diode D1, D3, D5, D7, D9, D11, D13, D15 is connected to direct supply VCC, described follower U1A, U1B, U1C, U1D, U2A, U2B, U2C, anti-and meet the second diode D2 between the input end of U2D and ground, D4, D6, D8, D10, D12, D14, D16, described follower U1A, U1B, U1C, U1D, U2A, U2B, U2C, the input end of U2D is also respectively through resistance R 13, R14, R15, R16, R17, R18, R19, R20 is connected to direct current reference power source Vref.
Especially, described direct supply VCC is through the in-phase end of the dividing potential drop access amplifier U3A of resistance R 25, R26, the end of oppisite phase of described amplifier U3A and the output terminal of described amplifier U3A also meet and export direct current reference power source Vref, shunt-wound capacitance C1, C2 between the in-phase end of described amplifier U3A and ground.
Compared with the prior art, beneficial effect of the present invention is embodied in:
1, the three-phase electricity of power supply and the three-phase electricity of standby power supply be will commonly use and dividing potential drop, stack DC reference voltage Vref first carried out, access again the input end of follower, the arithmetic control circuit of signal sample circuit and rear class is isolated mutually, when protecting the arithmetic control circuit of rear class, also improved the effect of transmission useful signal;
2, adopt the first diode and the second diode, can effectively protect follower not damaged by excessive voltage.
In sum, the present invention have simple in structure, cost is low, the characteristics of strong interference immunity.
Description of drawings
Fig. 1 is that embodiment of the present invention DC reference voltage Vref produces schematic diagram;
Fig. 2 is the circuit theory diagrams of the present invention's mains side three-phase voltage sample circuit commonly used;
Fig. 3 is the circuit theory diagrams of standby power supply side three-phase voltage sample circuit of the present invention.
Embodiment
as shown in Fig. 2～3, a kind of voltage detecting circuit of automatic change over, comprise power supply three-phase electricity commonly used and standby power supply three-phase electricity, through the arithmetic control circuit of corresponding three-phase voltage sample circuit access rear class, voltage sampling circuit comprises follower U1A respectively for power supply three-phase electricity commonly used and standby power supply three-phase electricity, U1B, U1C, U1D, U2A, U2B, U2C, U2D, phase line A1, B1, C1, N1, A2, B2, C2, N2 is respectively through resistance string R1R2, R3R4, R5R6, R21R22, R7R10, R8R11, R9R12, R23R24 access follower U1A, U1B, U1C, U1D, U2A, U2B, U2C, the input end of U2D, follower U1A, U1B, U1C, U1D, U2A, U2B, U2C, the input end of U2D is through the first diode D1, D3, D5, D7, D9, D11, D13, D15 is connected to direct supply VCC, follower U1A, U1B, U1C, U1D, U2A, U2B, U2C, anti-and meet the second diode D2 between the input end of U2D and ground, D4, D6, D8, D10, D12, D14, D16, follower U1A, U1B, U1C, U1D, U2A, U2B, U2C, the input end of U2D is also respectively through resistance R 13, R14, R15, R16, R17, R18, R19, R20 is connected to DC reference voltage Vref.
As shown in Figure 1, direct supply VCC is through the in-phase end of the dividing potential drop access amplifier U3A of resistance R 25, R26, and the output terminal of the end of oppisite phase of amplifier U3A and amplifier U3A also meets and export direct current reference power source Vref, shunt-wound capacitance C1, C2 between the in-phase end of amplifier U3A and ground.
With power supply three-phase electricity commonly used and standby power supply three-phase electricity respectively through the Operations Analysis computing through rear class of the magnitude of voltage of voltage sampling circuit gained, relative voltage poor with the relative voltage of Ua1, Ub1, Uc1 and Un1 and Ua2, Ub2, Uc2 and Un2 is poor, as the voltage monitoring value that characterizes corresponding power supply commonly used and standby power supply.
Claims (2)
1. the voltage detecting circuit of an automatic change over, comprise power supply three-phase electricity commonly used and standby power supply three-phase electricity, through the arithmetic control circuit of corresponding three-phase voltage sample circuit access rear class, it is characterized in that: described voltage sampling circuit comprises follower (U1A respectively for described power supply three-phase electricity commonly used and described standby power supply three-phase electricity, U1B, U1C, U1D, U2A, U2B, U2C, U2D), phase line (A1, B1, C1, N1, A2, B2, C2, N2) respectively through resistance string (R1R2, R3R4, R5R6, R21R22, R7R10, R8R11, R9R12, R23R24) access described follower (U1A, U1B, U1C, U1D, U2A, U2B, U2C, U2D) input end, described follower (U1A, U1B, U1C, U1D, U2A, U2B, U2C, U2D) input end is respectively through the first diode (D1, D3, D5, D7, D9, D11, D13, D15) be connected to direct supply (VCC), described follower (U1A, U1B, U1C, U1D, U2A, U2B, U2C, anti-and meet the second diode (D2 between input end U2D) and ground, D4, D6, D8, D10, D12, D14, D16), described follower (U1A, U1B, U1C, U1D, U2A, U2B, U2C, U2D) input end is also respectively through resistance (R13, R14, R15, R16, R17, R18, R19, R20) be connected to direct current reference power source (Vref).
2. the voltage detecting circuit of automatic change over according to claim 1, it is characterized in that: described direct supply (VCC) is through the in-phase end of the dividing potential drop access amplifier (U3A) of resistance (R25, R26), the output terminal of the end of oppisite phase of described amplifier (U3A) and described amplifier (U3A) also connects and exports described direct current reference power source (Vref), shunt-wound capacitance between the in-phase end of described amplifier (U3A) and ground (C1, C2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105968946A CN103091542A (en) | 2012-12-31 | 2012-12-31 | Voltage detection circuit capable of automatically transferring switch |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105968946A CN103091542A (en) | 2012-12-31 | 2012-12-31 | Voltage detection circuit capable of automatically transferring switch |
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| CN103091542A true CN103091542A (en) | 2013-05-08 |
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| CN2012105968946A Pending CN103091542A (en) | 2012-12-31 | 2012-12-31 | Voltage detection circuit capable of automatically transferring switch |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1156254A (en) * | 1996-01-29 | 1997-08-06 | 山东矿业学院 | Electronic peak-to-valley metering electric-energy meter |
| CN2686188Y (en) * | 2003-12-31 | 2005-03-16 | Tcl国际电工(无锡)有限公司 | Isolation detector for double-power source changeover switch |
| CN201797370U (en) * | 2010-08-17 | 2011-04-13 | 常熟开关制造有限公司(原常熟开关厂） | Control circuit for change-over switch device |
| CN202421279U (en) * | 2011-12-13 | 2012-09-05 | 常熟开关制造有限公司(原常熟开关厂） | Voltage and frequency measuring circuit for breaker |
| CN102662095A (en) * | 2012-05-07 | 2012-09-12 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit |
| CN102680766A (en) * | 2012-05-07 | 2012-09-19 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit for control and protection switches |
| CN203133140U (en) * | 2012-12-31 | 2013-08-14 | 浙江雷顿电气科技有限公司 | Voltage detecting circuit of automatic change-over switch |
-
2012
- 2012-12-31 CN CN2012105968946A patent/CN103091542A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1156254A (en) * | 1996-01-29 | 1997-08-06 | 山东矿业学院 | Electronic peak-to-valley metering electric-energy meter |
| CN2686188Y (en) * | 2003-12-31 | 2005-03-16 | Tcl国际电工(无锡)有限公司 | Isolation detector for double-power source changeover switch |
| CN201797370U (en) * | 2010-08-17 | 2011-04-13 | 常熟开关制造有限公司(原常熟开关厂） | Control circuit for change-over switch device |
| CN202421279U (en) * | 2011-12-13 | 2012-09-05 | 常熟开关制造有限公司(原常熟开关厂） | Voltage and frequency measuring circuit for breaker |
| CN102662095A (en) * | 2012-05-07 | 2012-09-12 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit |
| CN102680766A (en) * | 2012-05-07 | 2012-09-19 | 无锡智卓电气有限公司 | Three-phase voltage sampling circuit for control and protection switches |
| CN203133140U (en) * | 2012-12-31 | 2013-08-14 | 浙江雷顿电气科技有限公司 | Voltage detecting circuit of automatic change-over switch |
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