CN204807637U - A keep watch on alarm device for redundant dc supply return circuit of double - circuit - Google Patents
A keep watch on alarm device for redundant dc supply return circuit of double - circuit Download PDFInfo
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- CN204807637U CN204807637U CN201520366017.9U CN201520366017U CN204807637U CN 204807637 U CN204807637 U CN 204807637U CN 201520366017 U CN201520366017 U CN 201520366017U CN 204807637 U CN204807637 U CN 204807637U
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Abstract
The utility model relates to a keep watch on alarm device for redundant dc supply return circuit of double - circuit, include: two direct current sensors, it detects the electric current of two DC power supply outputs respectively and converts voltage signal to, an instrument amplifier, its calculation comes from respectively the voltage signal of direct current sensor exports difference voltage signal, a voltage comparater module, it will come from the differential voltage signal and the predetermined window voltage width of instrument amplifier carry out the comparison, a power field effect transistor, with a relay, wherein, surpass at differential voltage signal under the condition of predetermined window voltage width, the voltage comparater module triggers power field effect transistor release the relay to produce alarm signal. The utility model discloses an it can compare the electric current of two the redundant diodes of flowing through in real time to keep watch on alarm device to report to the police under the condition about breaking down.
Description
Technical field
The utility model relates to the supervision warning device for two-way redundant direct current current supply circuit, especially in distributed control system for the supervision warning device of two-way redundant direct current current supply circuit.
Background technology
Distributed control system (i.e. DCS, English full name DistributedControlSystem,) being one, what be made up of process control level and process monitoring level take communication network as the multi-level computer system of tie, wherein the direct supply of control system had both needed to power to the controller of control system, needed again the sensor assignment access voltage a large amount of to scene or operating voltage.Generating plant generally uses two-way redundant direct current Power supply, to guarantee the reliable and stable operation of distributed control system, i.e. and the design of so-called redundant power supply.If wherein a road direct supply breaks down, an other road direct supply can replace on unperturbed ground, makes the consumer of distributed control system can not power down, and then avoids causing genset chaser.The mode that the circuit realizing this redundant power no-harass switch generally adopts two diode common cathodes to connect: the anode of two diodes connects the positive pole of two direct supplys respectively, and the anode of the consumer of distributed control system is sent in the negative electrode parallel connection of two diodes afterwards, the negative terminal of the consumer of distributed control system is sent in the negative pole parallel connection of two direct supplys afterwards.Under normal circumstances, above-mentioned two diodes load current of will bearing about 50% respectively.If one in two direct supplys goes wrong, due to the unilateal conduction characteristic of diode and the nonlinear characteristic of diode PN joint equivalent resistance, the electric current flowing through two diodes will no longer balance.Current this design, diode can be disconnected when the direct supply of correspondence breaks down, but only has when a complete power down of road direct supply wherein and just can send alerting signal.If just diode breaks down or is current imbalance, then can not give the alarm.It is too of a specified duration that this may cause distributed control system to run under single channel direct supply, and immediately do not repair the diode in another road direct supply broken down, thus bring potential safety hazard.
Utility model content
The purpose of this utility model is to provide a kind of supervision warning device for two-way redundant direct current current supply circuit, it can compare in real time to the electric current flowing through two redundant diodes, and report to the police in case of a failure, thus improve the reliability and maintainability of two-way redundant direct current current supply circuit.Supervision warning device for two-way redundant direct current current supply circuit of the present utility model, comprising: two DC current sensor, and it detects the electric current of two direct supplys outputs respectively and converts voltage signal to; An instrument amplifier, it calculates respectively from the voltage signal of described DC current sensor and output difference divided voltage signal; A voltage comparator module, it compares from the differential voltage signal of described instrument amplifier and predetermined window voltage width; A transistor or field effect transistor; With a relay; Wherein, when differential voltage signal exceeds predetermined window voltage width, described voltage comparator module triggers described transistor or field effect transistor to discharge described relay, thus produces alerting signal.Above-mentioned warning device can compare in real time to the electric current of diode, and when diode break down or current imbalance export dry contact on-off model and carry out alert notice user and carry out inspection and maintenance.
According to an aspect of the present utility model, described DC current sensor detects the size of current of two described direct supplys outputs and exports from its output terminal after converting voltage signal in proportion to, its feeder ear is connected to the output plus terminal of a D.C. regulated power supply module, and its ground end connects the negative pole of working power.Differential Input anode and the Differential Input negative terminal of described instrument amplifier are connected the output terminal of described DC current sensor respectively and are exported from its output terminal by differential voltage signal, and its reference voltage end is connected to the voltage stabilizing end of a reference voltage source module.The input end of described voltage comparator module connects the output terminal of described instrument amplifier, and its output terminal is connected the grid of described power field effect pipe and connected the positive pole of working power by pull-up resistor.Power field effect pipe is adopted to be conducive to increasing the serviceable life monitoring warning device.
According to another aspect of the present utility model, described D.C. regulated power supply module is the insulating power supply module that+24V turns+5V, and its input anode connects the positive pole of working power, and its input negative terminal and output negative terminal are connected to the negative pole of working power simultaneously.D.C. regulated power supply module provides power supply for DC current sensor.
According to one side more of the present utility model, the anode of described reference voltage source module is connected to the negative pole of working power, its negative electrode is connected to the positive pole of working power by the 5th resistance and the 6th resistance, and be connected to the negative pole of working power by the 7th resistance, the 3rd electric capacity and described 6th resistance and described 7th resistor coupled in parallel.Reference voltage source module and periphery resistance, electric capacity form voltage of voltage regulation source.This voltage of voltage regulation is connected to the reference voltage end of instrument amplifier, allows the reference voltage of the amplitude of oscillation as instrument amplifier output voltage.
According to another aspect of the present utility model, described DC current sensor is Hall element, the anode wire of two described direct supplys is each passed through the perforation on two Hall elements, judges by the electric current detected on wire the electric current that two described direct supplys export.Hall element is used to detect DC current in wire with can can't harm unperturbed as the sensor of current measurement and transmitter.
According to another aspect of the present utility model, described DC current sensor is plug-in type current sensor.
According to another aspect of the present utility model, described instrument amplifier is single supply instrument amplifier, and described voltage comparator module is window voltage comparator.
According to another aspect of the present utility model, described voltage comparator inside modules comprises two voltage comparators, and its 4th pin and the 7th pin are input end and short circuit each other, and its first pin and the second pin are output terminal and short circuit each other.Bleeder circuit is formed between the both positive and negative polarity that first resistance, second resistance and the 3rd resistance are connected on working power successively, its the 6th pin is connected to the low voltage side of described second resistance, and its 5th pin is connected to the high-voltage side of described second resistance.The grid of described power field effect pipe connects the first pin and second pin of described voltage comparator module, and its source electrode connects the negative terminal of the coil of described relay, and its drain electrode connects the negative pole of working power.Power field effect pipe allows relay charged for a long time.
According to another aspect of the present utility model, the supervision warning device for two-way redundant direct current current supply circuit also comprises the stream diode that continues, described in the continue anode of stream diode connect the source electrode of described relay, and its negative electrode connects the positive pole of working power.Adopt the reverse voltage that the stream diode that continues is conducive to producing when suppressing relay coil dead electricity.
Hereafter by clearly understandable mode, accompanying drawings preferred embodiment, right above-mentioned characteristic, technical characteristic, advantage and implementation thereof are further described.
Accompanying drawing explanation
The following drawings only schematically illustrates the utility model and explains, does not limit scope of the present utility model.
Fig. 1 is the circuit diagram of the supervision warning device for two-way redundant direct current current supply circuit of the present utility model.
In Fig. 1, component symbol illustrates:
| A1、A2 | DC current sensor | C1、C2、C3 | High-frequency bypass capacitor |
| U1 | Instrument amplifier | Q1 | Transistor or field effect transistor |
| U2 | Voltage comparator | K1 | Relay |
| U3 | D.C. regulated power supply module | VCC | The cathode voltage of working power |
| U4 | Reference voltage source module | R4 | Window comparator exports pull-up resistor |
| R1、R2、R3 | The divider resistance of setting window voltage | R5、R6、R7 | The peripheral resistance of reference voltage source |
| D1 | Continue stream diode | DA、DB | Redundant diode |
| PA、PB | Direct supply | Vout | The output terminal of DC current sensor |
| Vr | Reference voltage | Va、Vb | Voltage signal |
| U2A、U2B | Voltage comparator | Vo | Output voltage |
| Vup | The window voltage upper limit | Vlow | Window voltage lower limit |
Embodiment
In order to the technical characteristic to utility model, object and effect have understanding clearly, now contrast accompanying drawing and embodiment of the present utility model is described, label identical in the various figures represents that structure is identical or structure is similar but the parts that function is identical.
In this article, " schematically " expression " serves as example, example or explanation ", not should by being described to any diagram of " schematically " in this article, embodiment is interpreted as a kind of preferred or have more the technical scheme of advantage.
For making simplified form, only schematically show the part relevant to the utility model in each figure, they do not represent its practical structures as product.In addition, being convenient to for making simplified form understand, there are the parts of identical structure or function in some figure, only schematically depict one of them, or only having marked one of them.
In this article, " one " not only represents " only this ", also can represent the situation of " more than one ".In this article, " on ", D score, "front", "rear", "left", "right" etc. only for representing the position relationship between relevant portion, and their absolute position non-limiting.
In this article, " first ", " second " etc. only for differentiation each other, but not represent they significance level and order etc.
Fig. 1 is the circuit diagram of the supervision warning device for two-way redundant direct current current supply circuit of the present utility model, supervision warning device wherein for two-way redundant direct current current supply circuit comprises: two DC current sensor A1, A2, and it detects the electric current of two direct supply PA, PB outputs respectively and converts voltage signal to; An instrument amplifier U1, it calculates respectively from the voltage signal of DC current sensor A1, A2 and output difference divided voltage signal; A voltage comparator module U2, it compares from the differential voltage signal of instrument amplifier U1 and predetermined window voltage width; A transistor or a field effect transistor Q1 and relay K 1; Wherein, when differential voltage signal exceeds predetermined window voltage width, voltage comparator module U2 trigger transistor or field effect transistor Q1 carry out release relay K1, thus produce alerting signal.
DC current sensor A1, A2 detect the size of current of two direct supply PA, PB outputs and export from the output end vo ut of DC current sensor A1, A2 after converting voltage signal in proportion to.The feeder ear of DC current sensor A1, A2 is connected to the output plus terminal of DC voltage-stabilizing module U3.The ground end GND of DC current sensor A1, A2 connects the negative pole of working power.DC current sensor A1, A2 detect the electric current flowing through redundant diode DA and DB respectively, and convert testing result to voltage signal Va and Vb linearly in proportion.Voltage signal Va and Vb is exported to the differential input end 2 and 3 of instrument amplifier U1 respectively by the output end vo ut of DC current sensor A1 and A2.When DC current sensor A1, A2 are Hall element, the anode wire of two direct supplys PA, PB is each passed through the perforation on two Hall elements, judges by the electric current detected on wire the electric current that two direct supplys PA, PB export.Hall element is used to detect DC current in wire with can can't harm unperturbed as the sensor of current measurement and transmitter.DC current sensor A1, A2 also can be plug-in type current sensor.
The Differential Input anode 3 of instrument amplifier U1 and Differential Input negative terminal 2 are connected respectively to the output end vo ut of DC current sensor A1, A2, and its reference voltage end 5 is connected to the voltage stabilizing end 3 of a reference voltage source module U4.It is the differential amplifier of 1 that instrument amplifier U1 is connected into a gain, voltage output value Vo=1* (the Vb-Va)+Vr of its output terminal 6, wherein Vr is reference voltage and is led to the reference voltage pin 5 of instrument amplifier U1 by the voltage stabilizing end 3 of reference voltage source module U4.Reference voltage source module U4 can be TL431 type reference voltage source, and can regulate.By the value selecting the resistance of the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 can adjust Vr, the computing formula of Vr is Vr=2.5+ (2.5/R7) * R6.Reference voltage source module U4 and the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 3rd electric capacity C3 form voltage of voltage regulation source.This voltage of voltage regulation is connected to the reference voltage end of instrument amplifier, allows the reference voltage of the amplitude of oscillation as instrument amplifier output voltage.The effect of D.C. regulated power supply module U3 is+5V voltage by+24V voltage transitions, thus provide power supply for Hall element A1 and A2.
The input end of voltage comparator module U2 connects the output terminal 6 of instrument amplifier U1, and its output terminal connects the grid of power field effect pipe Q1 also by the positive pole of a pull-up resistor R4 connection working power.Power field effect pipe allows relay charged for a long time.Voltage comparator module U2 inside comprises two voltage comparators U2A, U2B, wherein the 4th pin 4 of voltage comparator module U2 and the 7th pin 7 are input end and short circuit each other, and first pin 1 of voltage comparator module U2 and the second pin 2 are output terminal and short circuit each other.Bleeder circuit is formed between the both positive and negative polarity that first resistance R1, the second resistance R2 and the 3rd resistance R3 are connected on working power successively.6th pin 6 of voltage comparator module U2 is connected to the low voltage side of the second resistance R2, and the 5th pin 5 of voltage comparator module U2 is connected to the high-voltage side of the second resistance R2.Voltage comparator module U2 (being such as LM339 type voltage comparator chip) is four voltage comparator integrated circuit, and two comparer U2A and U2B wherein in voltage comparator module U2 are combined into a window voltage comparator.The output voltage Vo of instrument amplifier U1 (such as AD620 type instrument amplifier) is connected to the input end of voltage comparator module U2, i.e. the 4th pin 4 of voltage comparator module U2 and the 7th pin 7.When the magnitude of voltage of output voltage Vo drops between window voltage upper limit Vup and lower limit Vlow, first pin 1 of voltage comparator module U2 and the second pin 2 export high level.Otherwise, first pin 1 and second pin 2 output low level of voltage comparator module U2.When the magnitude of voltage of appropriate selection Vr time, when can ensure that the two-way direct supply of redundancy normally works, output voltage Vo drops in window voltage.
The grid of power field effect pipe Q1 connects first pin 1 and second pin 2 of voltage comparator module U2, and its source electrode connects the negative terminal of the coil of relay K 1, and its drain electrode connects the negative pole of working power.First pin 1 of voltage comparator module U2 and the second pin 2 are connected to the grid of N channel power field effect transistor Q1 (being such as IRF510 type power field effect pipe), are used for driving relay K 1 action.When two direct supplys PA, PB of redundancy are all normal, Vlow<Vo<Vup, first pin 1 of voltage comparator module U2 and the second pin 2 are high level (+24V), the grid voltage of power field effect pipe Q1 exceedes threshold voltage (+2V) conducting, relay coil obtains electric, relay K 1 output state normal signal; Otherwise if Vlow>Vo or Vup<Vo, relay coil dead electricity, relay K 1 exports fault-signal.Window voltage upper limit Vup and lower limit Vlow is determined by three electric resistance partial pressures, and by mating the first resistance R1, the second resistance R2, the resistance of the 3rd resistance R3 can change the value of window voltage upper limit Vup and lower limit Vlow, makes Vr-Vlow=Vup-Vr.In addition, export because the output terminal of voltage comparator module U2 is open-collector gate, the positive pole ability normal output low and high level signal of the 4th resistance R4 to working power must be connected.The source electrode of the anode connection relay K 1 flowing diode D1 that continues, and the negative electrode of the stream diode D1 that continues connects the positive pole of working power.Continue stream diode D1 for suppressing the reverse voltage produced during relay coil dead electricity.
Seen from the above description, if time breaking down and cause two-way current value difference to become large in any road of two-way redundant direct current current supply circuit, the absolute value of the voltage difference that two DC current sensor A1, A2 export | Vb-Va| will become greatly, thus cause that voltage comparator module U2's departed from Vr more by comparative voltage Vo=1* (Vb-Va)+Vr.When Vo exceeds window voltage upper limit Vup or lower limit Vlow, window output level overturns, and finally causes relay K 1 action to be reported to the police.
Be to be understood that, although this instructions describes according to each embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
A series of detailed description listed is above only illustrating for possible embodiments of the present utility model; they are also not used to limit protection domain of the present utility model; allly do not depart from the utility model skill equivalent embodiments of doing of spirit or change; as the combination of feature, segmentation or repetition, all should be included within protection domain of the present utility model.
Claims (9)
1., for the supervision warning device of two-way redundant direct current current supply circuit, it is characterized in that, comprising:
Two DC current sensor (A1, A2), it detects electric current that two direct supplys (PA, PB) export respectively and converts voltage signal to;
An instrument amplifier (U1), it calculates respectively from the voltage signal of described DC current sensor (A1, A2) and output difference divided voltage signal;
A voltage comparator module (U2), it compares from the differential voltage signal of described instrument amplifier (U1) and predetermined window voltage width;
A transistor or field effect transistor (Q1); With
A relay (K1);
Wherein, when differential voltage signal exceeds predetermined window voltage width, described voltage comparator module (U2) triggers described transistor or field effect transistor (Q1) discharges described relay (K1), thus produces alerting signal.
2., as claimed in claim 1 for the supervision warning device of two-way redundant direct current current supply circuit, it is characterized in that,
Described DC current sensor (A1, A2) detects size of current that two described direct supplys (PA, PB) export and exports from its output terminal (Vout) after converting voltage signal in proportion to, its feeder ear is connected to the output plus terminal of a D.C. regulated power supply module (U3), and its ground end (GND) connects the negative pole of working power;
Differential Input anode (3) and the Differential Input negative terminal (2) of described instrument amplifier (U1) are connected the output terminal (Vout) of described DC current sensor (A1, A2) respectively and are exported from its output terminal (6) by differential voltage signal, and its reference voltage end (5) is connected to the voltage stabilizing end (3) of a reference voltage source module (U4);
The input end of described voltage comparator module (U2) connects the output terminal (6) of described instrument amplifier (U1), and its output terminal is connected the grid of described power field effect pipe (Q1) and connected the positive pole of working power by pull-up resistor (R4).
3. as claimed in claim 2 for the supervision warning device of two-way redundant direct current current supply circuit, it is characterized in that, described D.C. regulated power supply module (U3) is the insulating power supply module that+24V turns+5V, its input anode connects the positive pole of working power, and its input negative terminal and output negative terminal are connected to the negative pole of working power simultaneously.
4. as claimed in claim 2 or claim 3 for the supervision warning device of two-way redundant direct current current supply circuit, it is characterized in that, the anode (2) of described reference voltage source module (U4) is connected to the negative pole of working power, its negative electrode (1) is connected to the positive pole of working power by the 5th resistance (R5) and the 6th resistance (R6), and the negative pole of working power is connected to by the 7th resistance (R7), the 3rd electric capacity (C3) is in parallel with described 6th resistance (R6) and described 7th resistance (R7).
5. as claimed in claim 2 for the supervision warning device of two-way redundant direct current current supply circuit, it is characterized in that, described DC current sensor (A1, A2) is Hall element, the anode wire of two described direct supplys (PA, PB) is each passed through the perforation on two Hall elements, judges by the electric current detected on wire the electric current that two described direct supplys (PA, PB) export.
6., as claimed in claim 2 for the supervision warning device of two-way redundant direct current current supply circuit, it is characterized in that, described DC current sensor (A1, A2) is plug-in type current sensor.
7. as claimed in claim 2 for the supervision warning device of two-way redundant direct current current supply circuit, it is characterized in that, described instrument amplifier (U1) is single supply instrument amplifier, and described voltage comparator module (U2) is window voltage comparator.
8. as claimed in claim 4 for the supervision warning device of two-way redundant direct current current supply circuit, it is characterized in that, described voltage comparator module (U2) inside comprises two voltage comparator (U2A, U2B), its the 4th pin (4) and the 7th pin (7) for input end and each other short circuit, its first pin (1) and the second pin (2) for output terminal and each other short circuit, first resistance (R1), bleeder circuit is formed between the both positive and negative polarity that second resistance (R2) and the 3rd resistance (R3) are connected on working power successively, its the 6th pin (6) is connected to the low voltage side of described second resistance (R2), and its 5th pin (5) is connected to the high-voltage side of described second resistance (R2),
The grid of described power field effect pipe (Q1) connects the first pin (1) and second pin (2) of described voltage comparator module (U2), its source electrode connects the negative terminal of the coil of described relay (K1), and its drain electrode connects the negative pole of working power.
9. as claimed in claim 8 for the supervision warning device of two-way redundant direct current current supply circuit, it is characterized in that, also comprise stream diode (D1) that continues, the described anode continuing stream diode (D1) connects the source electrode of described relay (K1), and its negative electrode connects the positive pole of working power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520366017.9U CN204807637U (en) | 2015-05-29 | 2015-05-29 | A keep watch on alarm device for redundant dc supply return circuit of double - circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520366017.9U CN204807637U (en) | 2015-05-29 | 2015-05-29 | A keep watch on alarm device for redundant dc supply return circuit of double - circuit |
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| CN204807637U true CN204807637U (en) | 2015-11-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181495A (en) * | 2017-12-11 | 2018-06-19 | 囯网河北省电力有限公司电力科学研究院 | Current Voltage conversion testing system and method |
| CN117420384A (en) * | 2023-10-13 | 2024-01-19 | 滨州新大新机电科技有限公司 | Redundant power supply power failure alarm method and circuit |
-
2015
- 2015-05-29 CN CN201520366017.9U patent/CN204807637U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181495A (en) * | 2017-12-11 | 2018-06-19 | 囯网河北省电力有限公司电力科学研究院 | Current Voltage conversion testing system and method |
| CN117420384A (en) * | 2023-10-13 | 2024-01-19 | 滨州新大新机电科技有限公司 | Redundant power supply power failure alarm method and circuit |
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Address after: No. A1051-1, Nanjing High tech Industrial Development Zone, Nanjing, Jiangsu Province, 211100 Patentee after: Siemens Energy Automation (Nanjing) Co.,Ltd. Address before: No. A1051-1, Nanjing High tech Industrial Development Zone, Nanjing, Jiangsu Province, 211100 Patentee before: SIEMENS POWER PLANT AUTOMATION Ltd. |