CN203691249U - Novel pre-charging circuit - Google Patents
Novel pre-charging circuit Download PDFInfo
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- CN203691249U CN203691249U CN201420017896.XU CN201420017896U CN203691249U CN 203691249 U CN203691249 U CN 203691249U CN 201420017896 U CN201420017896 U CN 201420017896U CN 203691249 U CN203691249 U CN 203691249U
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- circuit
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- voltage detection
- thyristor
- rectification
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Abstract
The utility model discloses a novel pre-charging circuit. The circuit comprises a three-phase full bridge half control rectification circuit, a drive circuit of the rectification circuit, an AC voltage detection circuit, a DC voltage detection circuit, a DC current sampling circuit, an inversion circuit, an inversion drive circuit and a digital signal processor. The digital signal processor is connected to the drive circuit of the rectification circuit, the AC voltage detection circuit, the DC voltage detection circuit, the DC current sampling circuit, and the inversion drive circuit. The three-phase full bridge half control rectification circuit is connected to the drive circuit of the rectification circuit, a DC current detection circuit and an AC voltage detection circuit. The inversion circuit is connected to the DC voltage detection circuit and the inversion drive circuit. The circuit is good in effects, long in service lifetime, high in safety, simple in circuit, low in loss, without a charging resistor added and without an impact current of a capacitor generated, so that a frequency converter is operated in a safer, more reliable and more stable manner.
Description
Technical field
The utility model relates to the precharge field of frequency converter, has proposed a kind of novel pre-charge circuit.
Background technology
Along with the fast development of Chinese society economy, the needs of energy-saving and emission-reduction are increasing.Because frequency converter has speed-regulating range width, fast response time, low speed torque is large, the high remarkable advantage that waits of energy-saving efficiency, therefore, the application of frequency converter aspect Electric Machine Control is more and more wider, the particularly control to the oil pumper in oil field, this fail safe to frequency converter is had higher requirement.
The pre-charge circuit of traditional frequency converter does not have protective circuit, therefore in safety problem, has hidden danger.For making the inner DC bus-bar voltage of frequency converter steady, prevent the fluctuation of voltage, generally jumbo electrochemical capacitor in parallel on DC bus, when frequency converter starts to power on, if directly give capacitor charging, can produce excessive charging current, and large electric current is to device, electric capacity all can cause great impact, light shorten useful life of device, heavy cause device damage, delay production, so traditional control strategy is to carry out current limliting at electrochemical capacitor front end serial connection charge resistance, after reaching certain numerical value, by the conducting thyristor in parallel with charging resistor, charging resistor is excised the voltage of electric capacity.If under the condition of not excising in charging resistor, just make frequency converter work output, because the power of charging resistor is less, excessive electric current can burn charging resistor.In tradition application, in the time that frequency converter powers on, the thyristor in parallel with charging resistor disconnects, and electric capacity charges by charging resistor, in the time that the numerical value of capacitance voltage reaches 80%, and thyristor conducting, excision charging resistor.And in the time powering on, if while having one to break down in multiple electrochemical capacitor, other electrochemical capacitor will bear larger voltage, cause the electrochemical capacitor shortening in useful life, even break down.
When oil pumper is during in down stroke, DC bus-bar voltage can raise, if exceeded after certain numerical value, can open braking circuit, by unnecessary energy consumption in brake resistance, thereby ensure that limiting voltage on DC bus is in certain safe range.Due to brake unit and electrochemical capacitor on circuit in relation in parallel, if therefore because certain reason causes the thyristor short circuit in braking circuit, in the time that frequency converter powers on, just the voltage at electrochemical capacitor two ends can be dragged down, when lower than require 80% time, to cause the thyristor cannot conducting, charging resistor be always in running order, likely causes that resistance burns out.
And along with the power requirement of frequency converter is increasing, to the device in pre-charge circuit, as also day by day harsh in the requirement of the hardware of thyristor and charging resistor and control strategy, cost also increases.
Summary of the invention
The technical problems to be solved in the utility model is to overcome above-mentioned defect, and a kind of novel pre-charge circuit is provided.
For addressing the above problem, the utility model adopts following technical scheme: a kind of novel pre-charge circuit, comprise three phase full bridge half-controlled rectifier circuit, the drive circuit of rectification circuit, ac voltage detection circuit, direct voltage testing circuit, direct current sample circuit, inverter circuit, inverse changing driving circuit and digital signal processor, described digital signal processor and rectification circuit drive circuit, ac voltage detection circuit, direct voltage testing circuit, D.C. current detecting circuit is connected with inverse changing driving circuit, the drive circuit of described three phase full bridge half-controlled rectifier circuit and rectification circuit, D.C. current detecting circuit is connected with ac voltage detection circuit, described inverter circuit is connected with inverse changing driving circuit with direct voltage testing circuit.
As preferably, described three phase full bridge half-controlled rectifier circuit comprises diode (D2), diode (D3), diode (D4), thyristor (T1), thyristor (T2), thyristor (T3).Described diode (D2), diode (D3), the negative electrode of diode (D4) is connected with DC voltage electrode, described diode (D2), diode (D3), the anode of diode (D4) respectively with thyristor (T1), thyristor (T2), the negative electrode of thyristor (T3) is connected, described thyristor (T1), thyristor (T2), the anode of thyristor (T3) is connected with the negative pole of direct voltage, described thyristor (T1), thyristor (T2), the gate pole of thyristor (T3) is connected with the triggering signal of digital signal processor respectively.
As preferably, after described DC voltage detecting device is isolated DC bus-bar voltage by employing DC voltage transformer, and the signal of sampling is converted into and meets the desired pulse signal of digital signal processor.
Be compared to traditional pre-charge circuit, the beneficial effect of pre-charge circuit of the present utility model is: saved the charging resistor of traditional use, reduced the cost of equipment; The charging voltage even variation of electrochemical capacitor, charging current is little, has extended the useful life of electric capacity; By detecting d. c. voltage signal and DC current signal, electrochemical capacitor and brake unit are protected, strengthen the reliability of pre-charge circuit.On improved basis, not only simplify pre-charge circuit, and increased the safety and reliability of pre-charge circuit.
Brief description of the drawings
Fig. 1 is the circuit principle structure figure of traditional pre-charge circuit;
Fig. 2 is the circuit principle structure figure of pre-charge circuit of the present utility model;
Fig. 3 is the control system block diagram of pre-charge circuit of the present utility model.
Embodiment
As Fig. 2, a kind of novel pre-charge circuit, comprise three phase full bridge half-controlled rectifier circuit, the drive circuit of rectification circuit, ac voltage detection circuit, direct voltage testing circuit, direct current sample circuit, inverter circuit, inverse changing driving circuit and digital signal processor, described digital signal processor and rectification circuit drive circuit, ac voltage detection circuit, direct voltage testing circuit, D.C. current detecting circuit is connected with inverse changing driving circuit, the drive circuit of described three phase full bridge half-controlled rectifier circuit and rectification circuit, D.C. current detecting circuit is connected with ac voltage detection circuit, described inverter circuit is connected with inverse changing driving circuit with direct voltage testing circuit.
As Fig. 2, described three phase full bridge half-controlled rectifier circuit comprises diode (D2), diode (D3), diode (D4), thyristor (T1), thyristor (T2), thyristor (T3).Described diode (D2), diode (D3), the negative electrode of diode (D4) is connected with DC voltage electrode, described diode (D2), diode (D3), the anode of diode (D4) respectively with thyristor (T1), thyristor (T2), the negative electrode of thyristor (T3) is connected, described thyristor (T1), thyristor (T2), the anode of thyristor (T3) is connected with the negative pole of direct voltage, described thyristor (T1), thyristor (T2), the gate pole of thyristor (T3) is connected with the triggering signal of digital signal processor respectively.
The present invention as shown in Figure 2, in the time that three-phase alternating current powers on, detect the zero crossing of A phase voltage by alternating voltage sampling circuit, in the time of A phase voltage zero passage, processor sends a road pulse signal, allowing within reasonable time, the Trigger Angle of thyristor T1 is reduced gradually from 180 ° to 0 °, in this process, make thyristor T2 and T3 cut-off.In the time that the Trigger Angle of thyristor T1 becomes 0 °, processor sends another two pulse signals, make thyristor T1, T2 and T3 conducting simultaneously by the drive circuit of rectification circuit, complete the process of charging, such charging process makes the voltage even variation at electrochemical capacitor two ends, impulse current useless simultaneously, extend the useful life of electrochemical capacitor, simultaneously owing to having saved charging resistor, therefore also avoid causing due to the fault of the fault of brake unit or the thyristor in parallel with charging resistor the damage of charging resistor.In this process, by direct voltage sampling apparatus, the voltage at capacitor C 2 two ends is sampled, detect direct voltage and whether occur extremely, as too fast in direct voltage rising, be to damage and cause by other electrochemical capacitors; Direct current voltage rise slower, may be this electric capacity damaged cause, now send alarm signal.By direct current sample circuit, the electric current in two buss lines is sampled, if it is abnormal to detect that direct current occurs, electric current when current ratio is normally worked is much larger, is that brake unit breaks down, now process the demonstration that gives a warning, and point out fault type.
Adopt after such scheme, the beneficial effect of pre-charge circuit of the present utility model is: saved the charging resistor of traditional use, reduced the cost of equipment; The charging voltage even variation of electrochemical capacitor, charging current is little, has extended the useful life of electric capacity; By detecting d. c. voltage signal and DC current signal, electrochemical capacitor and brake unit are protected, strengthen the reliability of pre-charge circuit.On improved basis, not only simplify pre-charge circuit, and increased the safety and reliability of pre-charge circuit.
Claims (2)
1. a novel pre-charge circuit, comprise three phase full bridge half-controlled rectifier circuit, the drive circuit of rectification circuit, ac voltage detection circuit, direct voltage testing circuit, direct current sample circuit, inverter circuit, inverse changing driving circuit and digital signal processor, described digital signal processor and rectification circuit drive circuit, ac voltage detection circuit, direct voltage testing circuit, D.C. current detecting circuit is connected with inverse changing driving circuit, the drive circuit of described three phase full bridge half-controlled rectifier circuit and rectification circuit, D.C. current detecting circuit is connected with ac voltage detection circuit, described inverter circuit is connected with inverse changing driving circuit with direct voltage testing circuit.
2. a kind of novel pre-charge circuit according to claim 1, it is characterized in that: described DC voltage detecting device is isolated DC bus-bar voltage by DC voltage transformer, and the signal of sampling is converted into and meets the desired voltage signal of digital signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420017896.XU CN203691249U (en) | 2014-01-10 | 2014-01-10 | Novel pre-charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420017896.XU CN203691249U (en) | 2014-01-10 | 2014-01-10 | Novel pre-charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203691249U true CN203691249U (en) | 2014-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420017896.XU Expired - Fee Related CN203691249U (en) | 2014-01-10 | 2014-01-10 | Novel pre-charging circuit |
Country Status (1)
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| CN (1) | CN203691249U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218782A (en) * | 2014-09-24 | 2014-12-17 | 阳光电源股份有限公司 | Inverter and DC (Direct Current) bus circuit thereof |
| CN104578746A (en) * | 2014-12-31 | 2015-04-29 | 山东艾磁驱动科技有限公司 | Electrolytic capacitor precharging circuit |
| CN106451721A (en) * | 2016-11-22 | 2017-02-22 | 浙江西盈科技股份有限公司 | All-solid-state precharging and power supply anti-reverse connection system for electric automobile |
| CN107437792A (en) * | 2016-05-27 | 2017-12-05 | 乐星产电(无锡)有限公司 | Guard method, device and its frequency converter of frequency converter charging circuit |
| CN109768728A (en) * | 2019-03-07 | 2019-05-17 | 深圳英飞源技术有限公司 | A kind of isolation type bidirectional transducer device |
| CN109842097A (en) * | 2017-11-28 | 2019-06-04 | Keb自动化两合公司 | Electronic protection circuit |
| CN110690813A (en) * | 2019-09-12 | 2020-01-14 | 珠海格力电器股份有限公司 | Capacitor charging control method and device based on switch control and converter |
| CN111342436A (en) * | 2020-01-09 | 2020-06-26 | 重庆理工大学 | Surge current suppression circuit and method |
| CN112134339A (en) * | 2019-06-24 | 2020-12-25 | 光宝电子(广州)有限公司 | Power conversion device, capacitor short-circuit protection circuit thereof and capacitor short-circuit protection method |
-
2014
- 2014-01-10 CN CN201420017896.XU patent/CN203691249U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218782A (en) * | 2014-09-24 | 2014-12-17 | 阳光电源股份有限公司 | Inverter and DC (Direct Current) bus circuit thereof |
| CN104218782B (en) * | 2014-09-24 | 2017-06-13 | 阳光电源股份有限公司 | A kind of inverter and its dc bus circuit |
| CN104578746A (en) * | 2014-12-31 | 2015-04-29 | 山东艾磁驱动科技有限公司 | Electrolytic capacitor precharging circuit |
| CN107437792A (en) * | 2016-05-27 | 2017-12-05 | 乐星产电(无锡)有限公司 | Guard method, device and its frequency converter of frequency converter charging circuit |
| CN107437792B (en) * | 2016-05-27 | 2019-04-05 | 乐星产电(无锡)有限公司 | Guard method, device and its frequency converter of frequency converter charging circuit |
| CN106451721A (en) * | 2016-11-22 | 2017-02-22 | 浙江西盈科技股份有限公司 | All-solid-state precharging and power supply anti-reverse connection system for electric automobile |
| CN109842097A (en) * | 2017-11-28 | 2019-06-04 | Keb自动化两合公司 | Electronic protection circuit |
| CN109768728A (en) * | 2019-03-07 | 2019-05-17 | 深圳英飞源技术有限公司 | A kind of isolation type bidirectional transducer device |
| CN112134339A (en) * | 2019-06-24 | 2020-12-25 | 光宝电子(广州)有限公司 | Power conversion device, capacitor short-circuit protection circuit thereof and capacitor short-circuit protection method |
| CN110690813A (en) * | 2019-09-12 | 2020-01-14 | 珠海格力电器股份有限公司 | Capacitor charging control method and device based on switch control and converter |
| CN111342436A (en) * | 2020-01-09 | 2020-06-26 | 重庆理工大学 | Surge current suppression circuit and method |
| CN111342436B (en) * | 2020-01-09 | 2021-10-26 | 重庆理工大学 | Surge current suppression circuit and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140702 Termination date: 20150110 |
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| EXPY | Termination of patent right or utility model |