CN204290931U - A kind of two get in two circuit the safe AND circuit adopting oscillator - Google Patents
A kind of two get in two circuit the safe AND circuit adopting oscillator Download PDFInfo
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- CN204290931U CN204290931U CN201420790797.5U CN201420790797U CN204290931U CN 204290931 U CN204290931 U CN 204290931U CN 201420790797 U CN201420790797 U CN 201420790797U CN 204290931 U CN204290931 U CN 204290931U
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Abstract
Described in the utility model a kind of two get in two circuit the safe AND circuit adopting oscillator, comprise isolated voltage up converting circuit one, isolated voltage up converting circuit two, oscillator, safety type relay, isolated boosting transducing circuit, isolated feedback circuit, the described input of isolated voltage up converting circuit one is connected with the output of CPU1, the isolated input of voltage up converting circuit two is connected with the output of CPU2, described isolated voltage up converting circuit one is connected by the input of oscillator with isolated boosting transducing circuit with the output of isolated voltage up converting circuit two, the output of isolated boosting transducing circuit is connected with the input of safety type relay, the input of described isolated feedback circuit is connected with the output of isolated boosting transducing circuit, its output is connected with the input of isolated boosting transducing circuit.The utility model can solve the problem of circuit safety and reliability preferably.
Description
Technical field
The utility model relates to railway signal technology field, is specifically related to a kind of two and gets in two circuit the safe AND circuit adopting oscillator.
Background technology
The safe AND circuit that current rail signal field uses is divided into two classes usually, one class is use two safety circuits, each CPU controls a safety circuit respectively, and each safety circuit controls a relay, is realized the function of logical "and" by the series connection of two relays.The method can solve the problem of fail safe, but shortcoming be use equipment more, cost is higher.An other class is use safety circuit, and the output of two CPU is through a safety and gate control relay, and the method only uses a relay, can effectively reduce costs, but reliability is poor.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of two and gets in two circuit the safe AND circuit adopting oscillator, and this main circuit will use the circuit of transformer and oscillator composition safety and door, can solve the problem of safety and reliability preferably.
For solving the problems of the technologies described above, the utility model by the following technical solutions:
A kind of two get in two circuit the safe AND circuit adopting oscillator, comprise isolated voltage up converting circuit one, isolated voltage up converting circuit two, oscillator, safety type relay, for driving safety type relay and the isolated boosting transducing circuit of isolating oscillator and relay, for being input to by reducing the isolated feedback circuit that isolated boosting transducing circuit waveform duty ratio reduces this circuit output voltage, the described input of isolated voltage up converting circuit one is connected with the output of CPU1, the isolated input of voltage up converting circuit two is connected with the output of CPU2, described isolated voltage up converting circuit one is connected by the input of oscillator with isolated boosting transducing circuit with the output of isolated voltage up converting circuit two, the output of isolated boosting transducing circuit is connected with the input of safety type relay, the input of described isolated feedback circuit is connected with the output of isolated boosting transducing circuit, its output is connected with the input of isolated boosting transducing circuit, the input of described isolated voltage up converting circuit one, isolated voltage up converting circuit two, isolated boosting transducing circuit is connected to a power supply.
Described isolated voltage up converting circuit one comprises the first metal-oxide-semiconductor, for the protection of the first block isolating circuit that the first metal-oxide-semiconductor is not burned, for improving the first step-up transformer of the square-wave signal amplitude that CPU1 exports, and square-wave signal is transformed into the sound change-over circuit of fixing high level; The grid of described first metal-oxide-semiconductor is connected with the output of CPU1 through the first block isolating circuit, the source ground of the first metal-oxide-semiconductor, the drain electrode of the first metal-oxide-semiconductor is connected with one end of the primary coil of the first step-up transformer, another termination power of primary coil, the secondary coil of described first step-up transformer is connected with oscillator through sound change-over circuit.
Described isolated boosting transducing circuit comprises the second block isolating circuit, the second metal-oxide-semiconductor, the second step-up transformer, rectification circuit and for driving the push-pull circuit of the second metal-oxide-semiconductor; One end of described second block isolating circuit is connected with oscillator, the other end is connected through the grid of push-pull circuit with the second metal-oxide-semiconductor, the source ground of described second metal-oxide-semiconductor, the drain electrode of the second metal-oxide-semiconductor is connected with one end of the primary coil of the second step-up transformer, another termination power of this primary coil, the secondary coil of described second step-up transformer is connected with safety type relay through rectification circuit; The output of described rectification circuit feeds back between oscillator and the second block isolating circuit through isolated feedback circuit.
Described oscillator is the astable oscillator that passive device is formed.
The beneficial effects of the utility model are: (1) safe AND circuit described in the utility model can not only save the space of circuit board effectively, reaches the object of high security simultaneously.By using the input signal of dynamic square-wave signal as logical "and" of two CPU, CPU can initiatively stop exporting dynamic square-wave signal, thus makes export orientation secure side; When after cpu fault, output from action-oriented secure side; If the waveforms amplitude that CPU exports, frequency or duty ratio are inconsistent with another one CPU, output, also by failure to the safe side side, by the analysis of above cpu fault and output level, effectively improves the safety and reliability of this circuit.(2) oscillator 3 adopts passive device to build, and meets internal type failure safe principle, and isolated voltage up converting circuit and isolated boosting transducing circuit all have employed step-up transformer, and no-load voltage ratio is greater than 4, further increases reliability and the fail safe of circuit.
Accompanying drawing explanation
Fig. 1 is the integrated circuit block diagram of the safe AND circuit of the utility model;
Fig. 2 is the internal frame diagram of isolated voltage up converting circuit one;
Fig. 3 is isolated boosting transducing inside circuit block diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model will be further described.
As shown in FIG. 1 to 3, two of the present embodiment gets in two circuit the safe AND circuit adopting oscillator, comprises isolated voltage up converting circuit 1, isolated voltage up converting circuit 22, oscillator 3, safety type relay 5, isolated boosting transducing circuit 4, isolated feedback circuit 6, the isolated input of voltage up converting circuit 1 is connected with the output of CPU1, the isolated input of voltage up converting circuit 22 is connected with the output of CPU2, isolated voltage up converting circuit 1 is connected by the input of oscillator 3 with isolated boosting transducing circuit 4 with the output of isolated voltage up converting circuit 22, the output of isolated boosting transducing circuit 4 is connected with the input of safety type relay 5, the input of isolated feedback circuit 6 is connected with the output of isolated boosting transducing circuit 4, its output is connected with the input of isolated boosting transducing circuit 4, the input of isolated voltage up converting circuit 1, isolated voltage up converting circuit 22, isolated boosting transducing circuit 4 connects power supply one, power supply two and power supply three respectively.
The output of oscillator 3 drives safety type relay 5 through isolated boosting transducing circuit 4, and the normally opened contact of safety type relay 5 provides dry contact to export, and normally-closed contact detects for CPU.The feature of safety type relay 5 is that normally opened contact and normally-closed contact can not close simultaneously, and CPU1 and CPU2 detects the state of 1 and normally-closed contact detection 2 detection normally-closed contacts respectively by normally-closed contact; When normally-closed contact closes, think that normally opened contact disconnects, this relay status is corresponding secure side, otherwise think that normally opened contact closes, this relay status is corresponding hazardous side, if CPU thinks that relay output state is now wrong, CPU will stop Dynamic Signal exporting, and disconnect safety type relay 5, make export orientation secure side.
Oscillator 3 is made up of passive device, is astable oscillator; The frequency of oscillator 3 can be regulated by regulating circuit parameter, and amplitude is determined by the output high level of isolated voltage up converting circuit 1 and isolated voltage up converting circuit 22.The output of oscillator 3 and the high level output of isolated voltage up converting circuit 1 and isolated voltage up converting circuit 22 have stronger dependence; When two isolated voltage up converting circuit output levels are not of uniform size cause time, oscillator 3 stops oscillation, export orientation secure side; Oscillator 3 self meets internal type failure safe principle, and when after the random devices fault in oscillator 3, oscillator 3 all will no longer vibrate, export orientation secure side.
Isolated voltage up converting circuit 1 is identical with the circuit of isolated voltage up converting circuit 22, and isolated voltage up converting circuit 1 comprises the first metal-oxide-semiconductor 10, first block isolating circuit 9, first step-up transformer 11, and sound change-over circuit 12; The grid of the first metal-oxide-semiconductor 10 is connected with the output of CPU1 through the first block isolating circuit 9, the source ground of the first metal-oxide-semiconductor 10, the drain electrode of the first metal-oxide-semiconductor 10 is connected with one end of the primary coil of the first step-up transformer 11, the secondary coil of another termination power one, first step-up transformer 11 of primary coil is connected with oscillator 3 through sound change-over circuit 12.The effect of the first block isolating circuit 9 prevents the fixing high level output of CPU1 from causing the permanent conducting of the first metal-oxide-semiconductor 10 thus burns out the first metal-oxide-semiconductor 10; First step-up transformer 11 converts the higher square-wave signal of the voltage magnitude of Amplitude Ration power supply one to the square-wave signal that CPU1 exports, and this square-wave signal is transformed into fixing high level through sound change-over circuit 12 again, and this high level output is to oscillator 3; Sound change-over circuit 12 adopts internal type failure safe to design, and any components and parts fault all can not export fixing high level, export orientation secure side.
Isolated boosting transducing circuit 4 comprises the second block isolating circuit 13, second metal-oxide-semiconductor 15, second step-up transformer 16, rectification circuit 17 and for driving the push-pull circuit 14 of the second metal-oxide-semiconductor 15; One end of second block isolating circuit 13 is connected with oscillator 3, the other end is connected through the grid of push-pull circuit 14 with the second metal-oxide-semiconductor 15, the source ground of the second metal-oxide-semiconductor 15, the drain electrode of the second metal-oxide-semiconductor 15 is connected with one end of the primary coil of the second step-up transformer 16, another termination power of this primary coil, the secondary coil of the second step-up transformer 16 is connected with safety type relay 5 through rectification circuit 17; The output of rectification circuit 17 is connected between oscillator 3 and the second block isolating circuit 13 through isolated feedback circuit 6.The effect of the second block isolating circuit 13 prevents from oscillator 3 from exporting fixed level to make the permanent conducting of the second metal-oxide-semiconductor 15 burn out the second metal-oxide-semiconductor 15, signal after the second block isolating circuit 13 is AC signal, this AC signal drives push-pull circuit 14, and push-pull circuit 14 drives the second metal-oxide-semiconductor 15.The effect of the second step-up transformer 16 is that the square-wave signal that oscillator 3 exports is converted to the higher square-wave signal of the voltage magnitude of Amplitude Ration power supply three, this square-wave signal is transformed into fixing high level after rectification circuit 17, and this fixing high level drives safety type relay 5.Rectification circuit 17 meets internal type failure safe principle, and when after any components and parts fault in oscillating circuit, the high level signal that rectification circuit 17 exports all cannot drive safety type relay 5, makes export orientation secure side.
CPU1 and CPU2 provides dynamic square-wave signal as control signal respectively to isolated voltage up converting circuit 1 with isolated voltage up converting circuit 22, the output of two isolated voltage up converting circuit realizes logical "and" function at oscillator 3 place, as long as there is one to stop exporting dynamic square-wave signal in two CPU, or to cause due to cpu fault cannot export dynamic square-wave signal the normally opened contact of safety type relay 5 all can be caused to disconnect, failure to the safe side side.Isolated voltage up converting circuit 1 and isolated voltage up converting circuit 22 complete the isolation between CPU1 and CPU2 two passages respectively, make the fault of CPU1 or CPU2 can not be diffused into the side of oscillator 3.When CPU1 and CPU2 exports fixing high level and fixing low level respectively, isolated voltage up converting circuit 1 does not have high level output with isolated voltage up converting circuit 22, and oscillator 3 cannot vibrate, export orientation secure side.The no-load voltage ratio of the transformer all adopted in isolated voltage up converting circuit 1 and isolated voltage up converting circuit 22 is greater than 4, and when circuit is short-circuited fault, output does not have the voltage being equivalent to input 4 times and exports; When isolated voltage up converting circuit 1 is different from the output high level of isolated voltage up converting circuit 22, oscillator 3 can not vibrate, export orientation secure side; Isolated voltage up converting circuit 1 adopts open loop control mode with isolated voltage up converting circuit 22, if square wave frequency or the duty ratio of CPU1 and CPU2 output are different, the high level that isolated voltage up converting circuit 1 and isolated voltage up converting circuit 22 export is also by different, oscillator 3 can not vibrate, export orientation secure side.When isolated voltage up converting circuit 1 is identical with the level that isolated voltage up converting circuit 22 exports, export the oscillator signal of a constant frequency, the frequency-adjustable of this oscillator signal.
Isolated boosting transducing circuit 4 achieves the isolation between safety type relay 5 and oscillator 3, the fault of safety type relay 5 end can not be diffused into oscillator 3 end, when oscillator 3 nonoscillatory, fixing high level or low level cannot by isolated boosting transducing circuit 4, export orientation secure side; The no-load voltage ratio of the transformer that isolated boosting transducing circuit 4 adopts is greater than 4, when be short-circuited fault time output do not have the voltage being equivalent to input 4 times yet and export, safety type relay 5 can not adhesive, export orientation secure side.
Isolated feedback circuit 6 can regulate the duty ratio of isolated boosting transducing circuit 4 input square wave according to the output voltage of isolated boosting transducing circuit 4, when the output voltage of isolated boosting transducing circuit 4 is too high, isolated feedback circuit 6 makes the duty ratio of the square wave being input to isolated boosting transducing circuit 4 reduce, thus reduces the output voltage of isolated boosting transducing circuit 4; When the output voltage of isolated boosting transducing circuit 4 is too low, isolated feedback circuit 6 is inoperative.
Above-described embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under the prerequisite not departing from the utility model design spirit; the various distortion that those of ordinary skill in the art make the technical solution of the utility model and improvement, all should fall in protection range that the utility model claims determine.
Claims (4)
1. get in two circuit the safe AND circuit adopting oscillator for one kind two, it is characterized in that: comprise isolated voltage up converting circuit one (1), isolated voltage up converting circuit two (2), oscillator (3), safety type relay (5), for driving safety type relay (5) and the isolated boosting transducing circuit (4) of isolating oscillator (3) and relay (5), reduce the isolated feedback circuit (6) of this circuit output voltage for being input to isolated boosting transducing circuit (4) waveform duty cycle by reduction, the input of described isolated voltage up converting circuit one (1) is connected with the output of CPU1, the input of isolated voltage up converting circuit two (2) is connected with the output of CPU2, described isolated voltage up converting circuit one (1) is connected by the input of oscillator (3) with isolated boosting transducing circuit (4) with the output of isolated voltage up converting circuit two (2), the output of isolated boosting transducing circuit (4) is connected with the input of safety type relay (5), the input of described isolated feedback circuit (6) is connected with the output of isolated boosting transducing circuit (4), its output is connected with the input of isolated boosting transducing circuit (4), the input of described isolated voltage up converting circuit one (1), isolated voltage up converting circuit two (2), isolated boosting transducing circuit (4) is connected to a power supply.
2. according to claim 1 a kind of two get in two circuit the safe AND circuit adopting oscillator, it is characterized in that: described isolated voltage up converting circuit one (1) is by the first metal-oxide-semiconductor (10), for the protection of the first block isolating circuit (9) that the first metal-oxide-semiconductor (10) is not burned, for improving first step-up transformer (11) of the square-wave signal amplitude that CPU1 exports, and square-wave signal is transformed into sound change-over circuit (12) composition of fixing high level; The grid of described first metal-oxide-semiconductor (10) is connected with the output of CPU1 through the first block isolating circuit (9), the source ground of the first metal-oxide-semiconductor (10), the drain electrode of the first metal-oxide-semiconductor (10) is connected with one end of the primary coil of the first step-up transformer (11), another termination power of primary coil, the secondary coil of described first step-up transformer (11) is connected with oscillator (3) through sound change-over circuit (12).
3. according to claim 1 a kind of two get in two circuit the safe AND circuit adopting oscillator, it is characterized in that: described isolated boosting transducing circuit (4) is by the second block isolating circuit (13), the second metal-oxide-semiconductor (15), the second step-up transformer (16), rectification circuit (17) and for driving the push-pull circuit of the second metal-oxide-semiconductor (15) (14) to form; One end of described second block isolating circuit (13) is connected with oscillator (3), the other end is connected through the grid of push-pull circuit (14) with the second metal-oxide-semiconductor (15), the source ground of described second metal-oxide-semiconductor (15), the drain electrode of the second metal-oxide-semiconductor (15) is connected with one end of the primary coil of the second step-up transformer (16), another termination power of this primary coil, the secondary coil of described second step-up transformer (16) is connected with safety type relay (5) through rectification circuit (17); The output of described rectification circuit (17) feeds back between oscillator (3) and the second block isolating circuit (13) through isolated feedback circuit (6).
4. according to claim 1 a kind of two get in two circuit the safe AND circuit adopting oscillator, it is characterized in that: the astable oscillator that described oscillator (3) is formed for passive device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420790797.5U CN204290931U (en) | 2014-12-15 | 2014-12-15 | A kind of two get in two circuit the safe AND circuit adopting oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420790797.5U CN204290931U (en) | 2014-12-15 | 2014-12-15 | A kind of two get in two circuit the safe AND circuit adopting oscillator |
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| Publication Number | Publication Date |
|---|---|
| CN204290931U true CN204290931U (en) | 2015-04-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420790797.5U Withdrawn - After Issue CN204290931U (en) | 2014-12-15 | 2014-12-15 | A kind of two get in two circuit the safe AND circuit adopting oscillator |
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| CN (1) | CN204290931U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467797A (en) * | 2014-12-15 | 2015-03-25 | 合肥工大高科信息科技股份有限公司 | Safety and gate circuit with oscillator adopted in 2-vote-2 circuit and control method thereof |
| CN113690083A (en) * | 2021-07-26 | 2021-11-23 | 北京全路通信信号研究设计院集团有限公司 | Inherent safe miniaturized safety AND gate |
-
2014
- 2014-12-15 CN CN201420790797.5U patent/CN204290931U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467797A (en) * | 2014-12-15 | 2015-03-25 | 合肥工大高科信息科技股份有限公司 | Safety and gate circuit with oscillator adopted in 2-vote-2 circuit and control method thereof |
| CN104467797B (en) * | 2014-12-15 | 2017-08-25 | 合肥工大高科信息科技股份有限公司 | A kind of two take the safety and gate circuit and its control method using oscillator in two circuits |
| CN113690083A (en) * | 2021-07-26 | 2021-11-23 | 北京全路通信信号研究设计院集团有限公司 | Inherent safe miniaturized safety AND gate |
| CN113690083B (en) * | 2021-07-26 | 2023-10-17 | 北京全路通信信号研究设计院集团有限公司 | Small-sized safety AND gate with inherent safety |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150422 Effective date of abandoning: 20170825 |
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| AV01 | Patent right actively abandoned |