CN100346565C - Thyristor self triggering frequency converter circuit - Google Patents
Thyristor self triggering frequency converter circuit Download PDFInfo
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- CN100346565C CN100346565C CNB2004100527139A CN200410052713A CN100346565C CN 100346565 C CN100346565 C CN 100346565C CN B2004100527139 A CNB2004100527139 A CN B2004100527139A CN 200410052713 A CN200410052713 A CN 200410052713A CN 100346565 C CN100346565 C CN 100346565C
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Abstract
The present invention discloses a self-triggering frequency-converting circuit of a thyristor, which comprises a rectification part, a DC filtering part with a precharge circuit, an inversion part and a control-driven part, wherein the rectification part, the DC filtering part with a precharge circuit, the inversion part and the control-driven part are orderly connected; the precharge circuit comprises a relay triggering circuit, a relay and a current-limiting resistor; the precharge circuit is characterized in that the precharge circuit also comprises a thyristor; the thyristor is connected with the current-limiting resistor in parallel; a normally closed contact of the relay is connected between a gate electrode and a negative electrode of the thyristor; a normally open contact is connected between the gate electrode and a positive electrode of the thyristor. When a frequency converter is switched on, the DC filtering part is connected with the current-limiting resistor in series, which enables a precharge current of an electrolytic condenser to be limited within an allowed rang. When precharge is over, the relay triggering circuit outputs a signal to realize the short circuit of the thyristor for the current-limiting resistor from triggering conduction and complete a precharge process. The self-triggering frequency-converting circuit has the advantages of simple self-triggering frequency converter structure of the thyristor, space saving, no noise and no spark.
Description
Technical field
The present invention relates to a kind of thyristor from the trigger-type converter circuit, specifically, relate to the converter circuit of the thyristor structure that direct current precharge link adopted.
Background technology
China's frequency converter kind is a lot of at present, and general converter circuit comprises the rectifying part that links to each other successively, DC filtering part, inversion part and controlling and driving part.In " AC-DC-AC " type frequency converter, in order to prevent the excessive charging current of firm power turn-on moment filter capacitor the diode of three-phase commutation bridge is damaged, generally the direct current component at this frequency converter needs a pre-charge circuit.As shown in Figure 1, adopted the mode of a relay J and resistance parallel connection in the low power frequency conversion device, after electrochemical capacitor is finished via the current-limiting resistance charging, thereby relay normally open contact closure short circuit current-limiting resistance finishes pre-charge process.And relay is difficult to bear when power is big slightly, and domestic frequency converter adopts contactor CJ three utmost point parallel waies as shown in Figure 2 to replace pre-charge-relay mostly, but following shortcoming is arranged like this: 1) volume is big, weight is big; 2) when adhesive and disjunction noise big, spark arranged; 3) three after-current imbalances extremely in parallel.
Summary of the invention
The objective of the invention is to, provide a kind of thyristor from the trigger-type converter circuit, the limitation that overcomes above-mentioned " AC-DC-AC " type frequency converter direct current component pre-charge circuit employing relay is big with the employing volume that contactor brought, weight is big, noise is big, spark and the unbalanced technical problem of three electrode currents are arranged.
In order to achieve the above object, technical scheme of the present invention is as follows:
A kind of thyristor comprises the rectifying part that links to each other successively from the trigger-type converter circuit, has the DC filtering part of pre-charge circuit, inversion part and controlling and driving part; Described pre-charge circuit comprises relay circuits for triggering, relay and current-limiting resistance; It is characterized in that described pre-charge circuit also comprises thyristor, this thyristor is in parallel with described current-limiting resistance; The normally closed interlock of relay is connected between the gate pole and negative electrode of thyristor, and normally open contact is connected between the gate pole and anode of thyristor by impedance component.
Adopt thyristor of the present invention from the trigger-type converter circuit, when making the firm power turn-on of frequency converter, the direct current component series limiting resistor is limited within the allowed band pre-charge current of electrochemical capacitor.After precharge finishes, relay circuits for triggering output signal make thyristor after triggering and conducting with the current-limiting resistance short circuit, finish pre-charge process.
Preferably, described relay circuits for triggering comprise power supply and triode, and the break-make of described relay is by a single-chip microcomputer and the control of described triode.
Preferably, be separated with photoelectrical coupler between described single-chip microcomputer and the relay circuits for triggering, with the protection single-chip microcomputer.
Described thyristor two ends piezo-resistance in parallel, the protection thyristor.
Described relay two ends fly-wheel diode in parallel for the coil of relay provides a discharge loop, plays the effect of protection photoelectrical coupler.
Compare with the circuit of existing employing contactor, the invention has the advantages that:
1. the saving space can be directly installed on the radiator, coordinates with other power components in the frequency converter, makes the frequency converter reasonable in internal structure.
2. because thyristor conducting disjunction noiselessness, therefore, the small sound when desire charging link has only the closed disjunction of miniature relay, and do not have the big noise of contactor adhesive disjunction.
3. can not produce spark when adhesive and disjunction, the security performance height can be applicable to explosion-proof occasion.
4. adopt the thyristor module mode, make the inner direct current component easy-to-connect of frequency converter, and do not have contactor three utmost points phase and the unbalanced problem of after-current, use simple.
5. the thyristor triggering signal is directly supplied with through impedance component by the direct current component electric current, need not provide triggering signal in addition, and circuit structure is simple.
Description of drawings
Fig. 1 is the existing precharge section circuit diagram that adopts relay;
Fig. 2 is the existing precharge section circuit diagram that adopts contactor;
Fig. 3 is a converter circuit schematic diagram of the present invention;
Fig. 4 is the pre-charge circuit schematic diagram in the converter circuit of the present invention.
The number in the figure explanation:
1-three phase rectifier part
2-DC filtering part
3-IGBT inversion part
4-control and drive part
The 5-current-limiting resistance
The 6-piezo-resistance
The 7-thyristor
The 8-impedance component
The 9-relay
The 10-fly-wheel diode
The 11-reverser
12-resistance
13-resistance
The 14-photoelectrical coupler
15-resistance
16-resistance
The 17-triode
21-photoelectrical coupler first pin
22-photoelectrical coupler crus secunda
23-photoelectrical coupler tripod
24-photoelectrical coupler the 4th pin
Embodiment
According to Fig. 3 and Fig. 4, provide better embodiment of the present invention, and described in detail below, enable to understand better function of the present invention, characteristics.
As shown in Figure 3, thyristor of the present invention comprises three phase rectifier part 1, DC filtering part 2, IGBT inversion part 3, control and drive part 4 from the trigger-type converter circuit, and wherein DC filtering part 2 contains a pre-charge circuit.Below just describe pre-charge circuit among the present invention in detail in conjunction with Fig. 4.
The pre-charge circuit main circuit is mainly composed in parallel by current-limiting resistance 5, thyristor 7.The resistance of current-limiting resistance 5 and power are fixed according to the length of frequency converter precharge time; The triggering signal of thyristor 7 is directly supplied with through impedance component 8 by direct current, so the resistance of impedance component 8 is selected to satisfy thyristor 7 with electric current and triggered and require to be as the criterion; The normally closed interlock of relay 9 is connected between the gate pole and negative electrode of thyristor 7, normally open contact is connected on the gate pole and impedance component 8 one ends of thyristor 7, purpose makes thyristor 7 gate poles link to each other with impedance component 8 when being to allow relay 9 actions, direct current provides triggering signal via impedance component 8 to thyristor 7 gate poles, makes thyristor 7 from conducting; Piezo-resistance 6 is connected in parallel on thyristor 7 two ends and plays the overvoltage protection effect.
Single-chip microcomputer is realized relay 9 controls by photoelectrical coupler 14 and triode 17 etc.; the used power supply of single-chip microcomputer is direct current 5V; the used power supply of relay 9 coils is direct current 12V; the effect of photoelectrical coupler 14 is exactly to make the 12V DC power supply of single-chip microcomputer and relay coil isolated, plays the effect of protection single-chip microcomputer.First pin 21 of photoelectrical coupler 14 connects+the 5V power supply, and crus secunda 22 is also received+the 5V power supply through resistance 13, tripod 23 ground connection, and the 4th pin 24 is connected to the base stage of triode 17 by resistance 15.Resistance 15 series resistances 16 are connected to the used power supply of relay 9 coils.Single-chip microcomputer delivery outlet PINOUT receives the crus secunda 22 of photoelectrical coupler 14 through reverser 11 and resistance 12.Resistance 13 plays a part to draw on the level, when single-chip microcomputer delivery outlet PINOUT hangs and when not having output signal, the crus secunda 22 of photoelectrical coupler 14 will by on move near 5V, make not conducting of light-emitting diode not luminous.The maximum 7V of reverse pressure drop between the transistor collector of photoelectrical coupler 14 and emitter, because the coil of relay 9 is perceptual devices, behind the coil deenergization, form a discharge loop with photoelectrical coupler 14, make to form reverse pressure drop in the photoelectrical coupler 14 between transistor collector and emitter, photoelectrical coupler is damaged.Fly-wheel diode 10 in parallel at the coil two ends of relay 9 for the coil of relay 9 provides a discharge loop, plays the effect of protection photoelectrical coupler 14.
When the firm power turn-on of frequency converter, single-chip microcomputer delivery outlet PINOUT output low level, give crus secunda 22 high level of photoelectrical coupler 14 through reverser 11 and resistance 12, not conducting of light-emitting diode in the photoelectrical coupler 14 is not luminous like this, make tripod 23, the 24 not conductings of the 4th pin of photoelectrical coupler 14, not conducting between the collector and emitter of triode 17, relay 9 coil no powers, thyristor 7 not conductings.So at this moment, frequency converter inside is the electrochemical capacitor charging through the direct current of three-phase commutation bridge 1 output via current-limiting resistance 5.
At pre-charge process, frequency convertor system monitoring capacitance group both end voltage, when monitoring after the capacitance group both end voltage rises to rated value, single-chip microcomputer delivery outlet PINOUT exports high level, give the crus secunda 22 of photoelectrical coupler 14 with low level via reverser 11 and resistance 12 backs, make the light-emitting diode conducting of photoelectrical coupler 14 luminous, the tripod 23 of photoelectrical coupler 14,24 conductings of the 4th pin, form positive pressure drop between the emitter and collector of triode 17, conducting between triode 17 emitters and the collector electrode, the coil two ends connection+12V power supply of relay 9 and ground, make the action of relay 9 contacts, after the action of relay 9 contacts, the gate pole of thyristor 7 disconnects with negative electrode and being connected, and is connected with anode and change into by impedance component 8.Like this, the direct current that comes out through three-phase commutation bridge 1 for thyristor 7 gate poles provide triggering signal, makes thyristor 7 conductings through impedance component 8, and current-limiting resistance 5 short circuits are finished pre-charge process.
Because thyristor 7 is half control type devices, in case conducting, no matter how triggering signal changes (being reduced to zero or reverse), can not change the conducting state of thyristor 7.Therefore, relay 9 normally open contacts just can recover to disconnect after thyristor 7 conductings, and single-chip microcomputer delivery outlet PINOUT need not to export high level again.
Above-described, be preferred embodiment of the present invention only, be not in order to limit scope of the present invention.For example, thyristor can connect alternative by PNP and two transistors of NPN type.Equally, the relay circuits for triggering can have various form, if trigger relay closed and disconnected in good time, thus the break-make of control thyristor gets final product.In other words, every simple, equivalence of doing according to the claims and the description of the present patent application changes and modifies, and all falls into the claim protection range of patent application of the present invention.
Claims (5)
1, a kind of thyristor is from the trigger-type converter circuit, comprise the rectifying part that links to each other successively, the DC filtering part that has pre-charge circuit, inversion part and controlling and driving part, described pre-charge circuit comprises relay circuits for triggering, relay and current-limiting resistance, it is characterized in that, described pre-charge circuit also comprises thyristor, this thyristor is in parallel with described current-limiting resistance, the normally closed interlock of relay is connected between the gate pole and negative electrode of thyristor, and normally open contact is connected between the gate pole and anode of thyristor by impedance component.
2, thyristor as claimed in claim 1 is characterized in that from the trigger-type converter circuit, and described relay circuits for triggering comprise power supply and triode, and the break-make of described relay is by a single-chip microcomputer and the control of described triode.
3, thyristor as claimed in claim 2 is characterized in that from the trigger-type converter circuit, is separated with photoelectrical coupler between described single-chip microcomputer and the relay circuits for triggering.
4, it is characterized in that described thyristor two ends piezo-resistance in parallel from the trigger-type converter circuit as the described thyristor of arbitrary claim in the claim 1 to 3.
5, it is characterized in that described relay two ends fly-wheel diode in parallel from the trigger-type converter circuit as the described thyristor of arbitrary claim in the claim 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100527139A CN100346565C (en) | 2004-07-09 | 2004-07-09 | Thyristor self triggering frequency converter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100527139A CN100346565C (en) | 2004-07-09 | 2004-07-09 | Thyristor self triggering frequency converter circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588779A CN1588779A (en) | 2005-03-02 |
| CN100346565C true CN100346565C (en) | 2007-10-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100527139A Expired - Fee Related CN100346565C (en) | 2004-07-09 | 2004-07-09 | Thyristor self triggering frequency converter circuit |
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| CN (1) | CN100346565C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8203810B2 (en) * | 2006-04-04 | 2012-06-19 | Tyco Electronics Corporation | Solid state pre-charge module |
| CN100459396C (en) * | 2006-12-13 | 2009-02-04 | 上海新时达电气股份有限公司 | Precharging circuit for converter |
| CN102594098B (en) * | 2012-03-23 | 2014-10-08 | 河海大学常州校区 | Energy-saving pulse triggering type thyristor driving circuit |
| CN102867686B (en) * | 2012-09-27 | 2015-08-19 | 广东易事特电源股份有限公司 | The circuit of the anti-relay contact adhesion of a kind of UPS battery discharging circuit |
| CN104092364B (en) * | 2014-05-30 | 2017-03-29 | 四川大学 | The soft start of high power switching power supply and head safety closing device and method |
| CN110165882A (en) * | 2018-05-08 | 2019-08-23 | 北京机电工程研究所 | For powering on the inverter of buffering |
| CN108982897B (en) * | 2018-08-01 | 2021-04-16 | 华自科技股份有限公司 | Signal detection circuit, measuring device and gear speed measurement system |
| CN109586557A (en) * | 2018-12-14 | 2019-04-05 | 上海辛格林纳新时达电机有限公司 | A kind of frequency converter pre-charge system and frequency converter |
| CN111509963A (en) * | 2020-05-27 | 2020-08-07 | 重庆大全泰来电气有限公司 | Surge current suppression device and converter |
| CN112491260A (en) * | 2020-11-25 | 2021-03-12 | 珠海格力电器股份有限公司 | Charging protection circuit and method and switching power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5511658A (en) * | 1978-07-12 | 1980-01-26 | Toshiba Corp | Electronic relay unit |
| JPH0866012A (en) * | 1994-08-11 | 1996-03-08 | Fuoresuto:Kk | Cycle control type solid state relay |
-
2004
- 2004-07-09 CN CNB2004100527139A patent/CN100346565C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5511658A (en) * | 1978-07-12 | 1980-01-26 | Toshiba Corp | Electronic relay unit |
| JPH0866012A (en) * | 1994-08-11 | 1996-03-08 | Fuoresuto:Kk | Cycle control type solid state relay |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1588779A (en) | 2005-03-02 |
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Owner name: DELIXI (HANGZHOU) INVERTER CO., LTD. Free format text: FORMER OWNER: DELIXI GROUP CO., LTD. Effective date: 20080919 |
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Effective date of registration: 20080919 Address after: No 98, stay Road, Hangzhou, Zhejiang, Xihu District Patentee after: DELIXI (HANGZHOU) INVERTER CO.,LTD. Address before: Yueqing City, Zhejiang province Liushi Delixi Industrial Park Patentee before: Delixi Group Co.,Ltd. |
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Granted publication date: 20071031 |