CN202256484U - Direct current bus voltage detecting circuit of power unit - Google Patents
Direct current bus voltage detecting circuit of power unit Download PDFInfo
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- CN202256484U CN202256484U CN2011203599948U CN201120359994U CN202256484U CN 202256484 U CN202256484 U CN 202256484U CN 2011203599948 U CN2011203599948 U CN 2011203599948U CN 201120359994 U CN201120359994 U CN 201120359994U CN 202256484 U CN202256484 U CN 202256484U
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Abstract
The utility model discloses a direct current bus voltage detecting circuit of a power unit. The circuit comprises a sampling circuit, a filter circuit, a V/F (Voltage/Frequency) converter, an optical coupling isolation circuit, a processor and an optical fiber communication circuit, wherein the sampling circuit is used for sampling direct current bus voltage signals in real time; the filter circuit is used for filtering the voltage signals output by the sampling circuit according to the requirements of system on accuracy and speed; the V/F converter is used for converting the voltage signals sampled in real time after being subjected to filter processing into corresponding frequency pulse sequence signals and completing the conversion of analog signals to digital signals; the optical coupling isolation circuit is used for isolating the sampling circuit, the filter circuit, the V/F converter and the processor; the processor is used for converting the voltage signals of the V/F converter into useable digital quantity signals and driving the optical fiber communication circuit; and the optical fiber communication circuit is used for uploading the digital quantity signals to a system main controller.
Description
Technical field
The utility model relates to frequency converter research and development technology field, relates in particular to a kind of power cell DC bus-bar voltage testing circuit.
Background technology
Power unit module is as the essential elements of power output in the high voltage converter, and it is functional, reliability, security directly determine the use of product in user's operating mode.When the frequency converter run with load; If the on-stream reduction instruction of motor frequency is too fast, then motoring condition will become the generating state operation, and born again energy is stored up in the direct current capacitors of frequency converter; Because capacitor volume and withstand voltage relation; Just need carry out in time, detect exactly voltage, to frequency converter provide accurately, information reliably, make frequency converter when overvoltage, carry out in time, effectively protect processing.Simultaneously the frequency converter power up, electric process need judge that all the state of current DC bus-bar voltage comes next step action of determining program down.The importance that detects in view of busbar voltage, the method for in the frequency converter design, busbar voltage being carried out accurate and effective detection is very necessary.
Because the application of microcomputer in industrial circle promoted the development of analog to digital conversion technology.In the application of Automation of Electric Systems, need carry out such as work such as spectrum analysis, logout, fault analyses, directly the alternating current-direct current sampling has become a kind of trend.Producer adopts the A/D device that the power cell busbar voltage is carried out sampling analysis mostly at present.The simplest way of A/D converter spare sampling is in circuit-under-test, to seal in the precision resistance dividing potential drop, and the voltage through direct collection resistance two ends obtains electric current.The A/D device can only be changed the voltage signal of certain limit, so in the voltage transitions process, need to select the precision resistance of suitable resistance.The principle of work of A/D device sampling is as shown in Figure 1; DC bus-bar voltage detects through electric resistance partial pressure or voltage Hall and sends to A/D device analog to digital conversion; After said A/D device analog-to-digital conversion process; Send to CPU through photoelectric isolating circuit and handle, thus the detection of realization power cell DC bus-bar voltage.
In the existing process that realizes, the designer finds to exist in the prior art following problem:
A/D sampling device is in industrial and on-the-spot monitoring in the prior art, because the abominable of environment, under strong electromagnetic interference (EMI), the antijamming capability of its system, reliability are not high.The index of especially, in the multipath high-speed data acquisition system (DAS), often having to reduce total system satisfies the requirement of reliability and precision.In addition, A/D converter also more complicated on circuit design and algorithm controls.
The utility model content
The embodiment of the utility model provides a kind of power cell DC bus-bar voltage testing circuit.For achieving the above object, the embodiment of the utility model adopts following technical scheme:
A kind of power cell DC bus-bar voltage testing circuit that the utility model provides comprises: sample circuit, filtering circuit, V/F conversion, optical coupling isolation circuit, processor, optical-fibre communications circuit;
Said sample circuit is used for real-time sampling DC bus-bar voltage signal;
Said filtering circuit is used for the requirement to precision and speed according to system, and the voltage signal that said sample circuit is exported carries out filtering;
Said V/F translation circuit is used for converting said voltage signal through the real-time sampling after the Filtering Processing into corresponding frequency pulse sequence signal, accomplishes the conversion of simulating signal to digital signal;
Said optical coupling isolation circuit is used to isolate said sample circuit, said filtering circuit, said V/F conversion and said processor;
Said processor is used for transferring the voltage signal of said V/F conversion to available digital quantity signal, and drives said optical-fibre communications circuit;
Said optical-fibre communications circuit is used for said digital quantity signal is uploaded to system master system device.
A kind of power cell DC bus-bar voltage testing circuit that the utility model embodiment provides, through sample circuit, filtering circuit, V/F conversion, optical coupling isolation circuit, processor, optical-fibre communications circuit; Said sample circuit is used for real-time sampling DC bus-bar voltage signal; Said filtering circuit is used for the requirement to precision and speed according to system, and the voltage signal that said sample circuit is exported carries out filtering; Said V/F translation circuit is used for converting said voltage signal through the real-time sampling after the Filtering Processing into corresponding frequency pulse sequence signal, accomplishes the conversion of simulating signal to digital signal; Said optical coupling isolation circuit is used to isolate said sample circuit, said filtering circuit, said V/F conversion and said processor; Said processor is used for transferring the voltage signal of said V/F conversion to available digital quantity signal, and drives said optical-fibre communications circuit; Said optical-fibre communications circuit is used for said digital quantity signal is uploaded to system master system device.Adopt the utility model not only can improve antijamming capability, the reliability of total system, and, guaranteed the security of power cell, reduced the failure rate of frequency converter owing to real-time collection to DC bus-bar voltage.Because advantages such as V/F change-over circuit simplicity of design, control are conveniently, and be with low cost have improved production efficiency greatly, have also reduced the complexity of power cell DC bus-bar voltage testing circuit.
Description of drawings
Fig. 1 is that the sampling of available technology adopting A/D device realizes power cell DC bus-bar voltage testing circuit structural representation;
A kind of power cell DC bus-bar voltage testing circuit structural representation that Fig. 2 provides for the utility model embodiment;
Sample circuit structural representation in a kind of power cell DC bus-bar voltage testing circuit that Fig. 3 provides for the utility model embodiment;
Filtering circuit and V/F translation circuit structural representation in a kind of power cell DC bus-bar voltage testing circuit that Fig. 4 provides for the utility model embodiment;
A kind of power cell DC bus-bar voltage testing circuit that Fig. 5 provides for the utility model embodiment is controlled the bottom software realization flow figure of V/F conversion.
Embodiment
Below in conjunction with accompanying drawing a kind of power cell DC bus-bar voltage testing circuit that the utility model embodiment provides is described in detail.
A kind of power cell DC bus-bar voltage testing circuit structural representation as shown in Figure 2, as to provide for the utility model embodiment; This circuit comprises: sample circuit, filtering circuit, V/F conversion, optical coupling isolation circuit, processor, optical-fibre communications circuit;
Said sample circuit is used for real-time sampling DC bus-bar voltage signal; The busbar voltage sample range generally between 0～1300V, so the vital task of this functional circuit be needs according to the back circuit busbar voltage is depressured to-12V～+ 12V.Through selecting suitable sampling resistor parameter, utilize electric resistance partial pressure technology, 0～1300V DC bus-bar voltage is depressured to the scope of regulation, simultaneously the DC bus-bar voltage for input also should be provided with, under-voltage protection function.The electric resistance partial pressure technology adopts diode IN4148 clamper and operational amplifier LM324 voltage follower to accomplish through mating suitable resistance simultaneously in this programme.
Said filtering circuit is used for the requirement to precision and speed according to system, and the voltage signal that said sample circuit is exported carries out filtering; As shown in Figure 4, the utility model selects single order RC passive filter to accomplish this function, simultaneously need be at sampling resistor side output-parallel one filter capacitor C311, with the moment spike of filtering voltage signal.
Said V/F translation circuit is used for converting said voltage signal through the real-time sampling after the Filtering Processing into corresponding frequency pulse sequence signal, accomplishes the conversion of simulating signal to digital signal; This functional module is whole key for design position; Require important performance indexes such as conversion accuracy is high, speed is fast, the linearity good, antijamming capability is strong, temperature stability is good, interface shape is simple; According to these important performance index; Can select special-purpose integrated chip IC to accomplish, the design is as shown in Figure 4, selects for use the LM331 of U.S. NS company to accomplish.The principle of work of V/F translation circuit: when input end VINAD imports a positive voltage; Output terminal FOUT is a logic low; Simultaneously power supply Vdd is also through 325 chargings of 338 pairs of capacitor C of resistance R, when capacitor C 325 two ends charging voltages greater than Vdd 2/3 the time, output terminal FOUT is a logic high; Capacitor C 325 is discharged rapidly through inner return-to-zero transistor, and 337 discharges of 324 pairs of resistance R of capacitor C this moment.When capacitor C 325 sparking voltages equaled input voltage VIN AD, output terminal FOUT was logic low once more.Circulation so repeatedly constitutes self-sustained oscillation.Output pulse frequency FOUT is directly proportional with input voltage VIN AD, thereby has realized the voltage-frequency conversion.
Said optical coupling isolation circuit is used to isolate said sample circuit, said filtering circuit, and said V/F conversion and said processor with protection back-end processor and other operating circuit, guarantee the reliability of total system; Require that isolation voltage is high, transmission speed is fast, interface is convenient, the 6N137 of this design Selection Agilent Technologies as shown in Figure 4 company accomplishes.When the 2 pin voltage signals of chip 6N137 during greater than the input signal of 3 pin, internal body diodes is luminous, and 6 pin VO export high level; On the contrary when 2 pin voltage signals during less than the input signal of 3 pin, internal body diodes is not luminous, and 6 pin VO export high level.
Said processor is used for transferring the voltage signal of said V/F conversion to available digital quantity signal, and drives said optical-fibre communications circuit; Digital information is uploaded to system master system device removes to accomplish corresponding control logic or algorithm etc.; Requirement is calculated the pulse train of V/F conversion through software algorithm, target voltage values by the time, and can convert the high-speed figure serial data into and send the rear end link to; Two principal elements of taking into account system demand and the design's demand; Select the CPLD logical process chip EPM3256ATC144-10 of ALTER company to accomplish, the bottom software algorithm is referring to process flow diagram shown in Figure 5, and this bottom software algorithm is: time 4ms during setting; CPLD detects V/F conversion output frequency rising edge of a pulse; Whenever detect a frequency pulse rising edge, timer conter adds 1, up to the 4ms end of fixing time.The counting sum multiply by 5 at last and obtains the maximum target voltage value, and flow process finishes.
Said optical-fibre communications circuit is used for said digital quantity signal is uploaded to system master system device.The main serial data transmission of accomplishing high speed, high noise immunity and high-isolating between link 5 described processor-CPU and the master controller; The design selects HFBR-1521, the transmission of accomplishing serial data of HFBR-2521, the reception of Agilent Technologies company for use; Its communication speed can dispose through the performance of processor according to HFBR-1521, HFBR-2521 chip, generally is configured in 500KHz～5.5MHz scope.
It should be noted that; Said V/F translation circuit is as shown in Figure 4, and this V/F translation circuit comprises: first resistance R 334, second resistance R 335, the 3rd resistance R 336, the 4th resistance R 337, the 5th resistance R 338, the 6th resistance R 339, the 7th resistance R 340, zero-regulator resistor RP34, gain-adjusted resistance R P35, first capacitor C 324, second capacitor C 325 and signal transformation module LM331;
One termination V/F input end reference voltage (REF-V/F) of said first resistance R 334, the end of the said zero-regulator resistor RP34 of another termination;
The other end ground connection of said zero-regulator resistor RP34; The slider end of said zero-regulator resistor RP34 links to each other with said second resistance R, 335 1 ends;
The other end of said second resistance R 335 links to each other with said the 3rd resistance R 336, said the 4th resistance R 337 respectively;
Said the 3rd resistance R 336 other end ground connection; Said the 4th resistance R 337 other ends link to each other with said signal transformation module LM331;
The two ends of 324 parallel connections of said first capacitor C and said the 4th resistance;
Said second capacitor C, 325 1 ends link to each other other end ground connection with said the 5th resistance R 338, said signal transformation module LM331 respectively;
Said the 5th resistance R 338 another termination voltage sources (+12V);
Said the 7th resistance R 340 1 ends and said voltage source (+12V) linking to each other, the other end links to each other with said optical coupling isolation circuit;
Said the 6th resistance R 339 1 ends link to each other with said signal transformation module LM331, and the other end links to each other with said gain-adjusted resistance R P35;
The other end of said gain-adjusted resistance R P35 and its slider end ground connection.
It is also to be noted that,
Said filtering circuit comprises: the 8th resistance R 332, the 9th resistance R 333 and the 3rd capacitor C 323;
The said sample circuits of said the 8th resistance R 332 1 terminations (promptly receiving signal VINAD), other end ground connection;
The said sample circuits of said the 9th resistance R 333 1 terminations (promptly receiving signal VINAD), the other end link to each other with the signal transformation module LM331 of said the 3rd capacitor C 323, said V/F translation circuit respectively.
It is also to be noted that,
Said sample circuit comprises: the tenth resistance R the 301, the 11 resistance R the 302, the 12 resistance R the 303, the 13 resistance R the 304, the 14 resistance R 305, the 4th capacitor C 311, the first diode V301, the second diode V302 and operational amplifier LM324;
The said power cell DC bus-bar voltage of said the tenth resistance R 301 1 terminations input end one, said the 11 resistance R 302 of another termination;
The said power cell DC bus-bar voltage of said the 12 resistance R 303 1 terminations input end two, said the 13 resistance R 304 of another termination;
The other end of said the 11 resistance R 302 links to each other with an end of said the 14 resistance R 305, said the 4th capacitor C 311 respectively; The other end of said the 13 resistance R 304 links to each other with the other end of said the 14 resistance R 305, said the 4th capacitor C 311 respectively, and ground connection;
The said voltage source of negative pole termination of the said first diode V301 (+12V), positive terminal links to each other with the negative pole end of the said second diode V302, the positive terminal of said operational amplifier LM324 respectively;
The positive terminal ground connection of the said second diode V302; The negative pole end of said operational amplifier LM324 links to each other with the output terminal of said operational amplifier N301D, and the output signal VINAD give said filtering circuit.
A kind of power cell DC bus-bar voltage testing circuit that the utility model embodiment provides, through sample circuit, filtering circuit, V/F conversion, optical coupling isolation circuit, processor, optical-fibre communications circuit; Said sample circuit is used for real-time sampling DC bus-bar voltage signal; Said filtering circuit is used for the requirement to precision and speed according to system, and the voltage signal that said sample circuit is exported carries out filtering; Said V/F translation circuit is used for converting said voltage signal through the real-time sampling after the Filtering Processing into corresponding frequency pulse sequence signal, accomplishes the conversion of simulating signal to digital signal; Said optical coupling isolation circuit is used to isolate said sample circuit, said filtering circuit, said V/F conversion and said processor; Said processor is used for transferring the voltage signal of said V/F conversion to available digital quantity signal, and drives said optical-fibre communications circuit; Said optical-fibre communications circuit is used for said digital quantity signal is uploaded to system master system device.Adopt the utility model not only can improve antijamming capability, the reliability of total system, and, guaranteed the security of power cell, reduced the failure rate of frequency converter owing to real-time collection to DC bus-bar voltage.Because advantages such as V/F change-over circuit simplicity of design, control are conveniently, and be with low cost have improved production efficiency greatly, have also reduced the complexity of power cell DC bus-bar voltage testing circuit.
The above; Be merely the embodiment of the utility model; But the protection domain of the utility model is not limited thereto; Any technician who is familiar with the present technique field can expect changing or replacement in the technical scope that the utility model discloses easily, all should be encompassed within the protection domain of the utility model.Therefore, the protection domain of the utility model should be as the criterion by said protection domain with claim.
Claims (4)
1. a power cell DC bus-bar voltage testing circuit is characterized in that, comprising: sample circuit, filtering circuit, V/F conversion, optical coupling isolation circuit, processor, optical-fibre communications circuit;
Said sample circuit is used for real-time sampling DC bus-bar voltage signal;
Said filtering circuit is used for the requirement to precision and speed according to system, and the voltage signal that said sample circuit is exported carries out filtering;
Said V/F translation circuit is used for converting said voltage signal through the real-time sampling after the Filtering Processing into corresponding frequency pulse sequence signal, accomplishes the conversion of simulating signal to digital signal;
Said optical coupling isolation circuit is used to isolate said sample circuit, said filtering circuit, said V/F conversion and said processor;
Said processor is used for transferring the voltage signal of said V/F conversion to available digital quantity signal, and drives said optical-fibre communications circuit;
Said optical-fibre communications circuit is used for said digital quantity signal is uploaded to system master system device.
2. power cell DC bus-bar voltage testing circuit according to claim 1; It is characterized in that said V/F translation circuit comprises: first resistance, second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, zero-regulator resistor, gain-adjusted resistance, first electric capacity, second electric capacity and signal transformation module;
One termination V/F input end reference voltage (REF-V/F) of said first resistance, an end of the said zero-regulator resistor of another termination;
The other end ground connection of said zero-regulator resistor; The slider end of said zero-regulator resistor links to each other with said second resistance, one end;
The other end of said second resistance links to each other with said the 3rd resistance, said the 4th resistance respectively;
Said the 3rd resistance other end ground connection; Said the 4th resistance other end links to each other with said signal transformation module;
The two ends of said first electric capacity parallel connection and said the 4th resistance;
Said second electric capacity, one end links to each other other end ground connection with said the 5th resistance, said signal transformation module respectively;
Another termination voltage source of said the 5th resistance;
Said the 7th resistance one end links to each other with said voltage source, and the other end links to each other with said optical coupling isolation circuit;
Said the 6th resistance one end links to each other with said signal transformation module, and the other end links to each other with said gain-adjusted resistance;
The other end of said gain-adjusted resistance and slider end ground connection.
3. power cell DC bus-bar voltage testing circuit according to claim 1 and 2 is characterized in that said filtering circuit comprises: the 8th resistance, the 9th resistance and the 3rd electric capacity;
The said sample circuit of said the 8th resistance one termination, other end ground connection;
The said sample circuit of said the 9th resistance one termination, the other end link to each other with the signal transformation module of said the 3rd electric capacity, said V/F translation circuit respectively.
4. power cell DC bus-bar voltage testing circuit according to claim 3; It is characterized in that said sample circuit comprises: the tenth resistance, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance, the 4th electric capacity, first diode, second diode and operational amplifier;
The said power cell DC bus-bar voltage of said the tenth resistance one termination input end one, said the 11 resistance of another termination;
The said power cell DC bus-bar voltage of said the 12 resistance one termination input end two, said the 13 resistance of another termination;
The other end of said the 11 resistance links to each other with an end of said the 14 resistance, said the 4th electric capacity respectively; The other end of said the 13 resistance links to each other with the other end of said the 14 resistance, said the 4th electric capacity respectively, and ground connection;
The said voltage source of negative pole termination of said first diode, positive terminal link to each other with the negative pole end of said second diode, the positive terminal of said operational amplifier respectively;
The positive terminal ground connection of said second diode; The negative pole end of said operational amplifier links to each other with the output terminal of said operational amplifier, outputs signal to said filtering circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203599948U CN202256484U (en) | 2011-09-23 | 2011-09-23 | Direct current bus voltage detecting circuit of power unit |
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| CN2011203599948U CN202256484U (en) | 2011-09-23 | 2011-09-23 | Direct current bus voltage detecting circuit of power unit |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998512A (en) * | 2012-10-30 | 2013-03-27 | 广东易事特电源股份有限公司 | Direct-current high-voltage isolation sampling circuit |
| CN105486916A (en) * | 2015-11-16 | 2016-04-13 | 国家电网公司 | Direct current signal acquisition circuit facing intelligent transformer station |
| CN107765069A (en) * | 2017-10-18 | 2018-03-06 | 北京金自天正智能控制股份有限公司 | A kind of high-voltage high-power converter Current Voltage gloss sampling device |
| CN108490293A (en) * | 2018-03-23 | 2018-09-04 | 天津职业技术师范大学 | A kind of detection circuit and control method of three-phase inverter |
| CN108627690A (en) * | 2018-04-03 | 2018-10-09 | 芜湖美的厨卫电器制造有限公司 | A kind of ac voltage detection circuit, detection method and detection device |
| CN109525037A (en) * | 2018-11-28 | 2019-03-26 | 国网江苏省电力有限公司徐州供电分公司 | A kind of transforming plant DC busbar voltage acquisition device and monitoring method |
| CN110031685A (en) * | 2019-05-22 | 2019-07-19 | 成都思鸿维科技有限责任公司 | A kind of inductance measurement system and method for coil |
| CN110988441A (en) * | 2019-12-25 | 2020-04-10 | 联合汽车电子有限公司 | DC bus voltage monitoring system and method |
| CN111579860A (en) * | 2020-05-25 | 2020-08-25 | 青岛中加特电气股份有限公司 | Circuit device for collecting output voltage of frequency converter |
| CN111799987A (en) * | 2020-06-23 | 2020-10-20 | 新风光电子科技股份有限公司 | Direct-current bus voltage acquisition circuit and method for 10kV high-voltage frequency conversion integrated machine |
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2011
- 2011-09-23 CN CN2011203599948U patent/CN202256484U/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998512A (en) * | 2012-10-30 | 2013-03-27 | 广东易事特电源股份有限公司 | Direct-current high-voltage isolation sampling circuit |
| CN102998512B (en) * | 2012-10-30 | 2015-08-19 | 广东易事特电源股份有限公司 | A kind of high direct voltage isolation sample circuit |
| CN105486916A (en) * | 2015-11-16 | 2016-04-13 | 国家电网公司 | Direct current signal acquisition circuit facing intelligent transformer station |
| CN105486916B (en) * | 2015-11-16 | 2018-06-01 | 国家电网公司 | A kind of direct-current signal acquisition circuit towards intelligent substation |
| CN107765069A (en) * | 2017-10-18 | 2018-03-06 | 北京金自天正智能控制股份有限公司 | A kind of high-voltage high-power converter Current Voltage gloss sampling device |
| CN108490293A (en) * | 2018-03-23 | 2018-09-04 | 天津职业技术师范大学 | A kind of detection circuit and control method of three-phase inverter |
| CN108627690A (en) * | 2018-04-03 | 2018-10-09 | 芜湖美的厨卫电器制造有限公司 | A kind of ac voltage detection circuit, detection method and detection device |
| CN109525037A (en) * | 2018-11-28 | 2019-03-26 | 国网江苏省电力有限公司徐州供电分公司 | A kind of transforming plant DC busbar voltage acquisition device and monitoring method |
| CN110031685A (en) * | 2019-05-22 | 2019-07-19 | 成都思鸿维科技有限责任公司 | A kind of inductance measurement system and method for coil |
| CN110988441A (en) * | 2019-12-25 | 2020-04-10 | 联合汽车电子有限公司 | DC bus voltage monitoring system and method |
| CN110988441B (en) * | 2019-12-25 | 2023-11-28 | 联合汽车电子有限公司 | DC bus voltage monitoring system and method |
| CN111579860A (en) * | 2020-05-25 | 2020-08-25 | 青岛中加特电气股份有限公司 | Circuit device for collecting output voltage of frequency converter |
| CN111799987A (en) * | 2020-06-23 | 2020-10-20 | 新风光电子科技股份有限公司 | Direct-current bus voltage acquisition circuit and method for 10kV high-voltage frequency conversion integrated machine |
| CN111799987B (en) * | 2020-06-23 | 2023-07-07 | 新风光电子科技股份有限公司 | DC bus voltage acquisition circuit and method for 10kV high-voltage frequency conversion integrated machine |
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