CN101295918A - Soft switching method for electric control switch of three-phase alternating-current input circuit - Google Patents
Soft switching method for electric control switch of three-phase alternating-current input circuit Download PDFInfo
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- CN101295918A CN101295918A CNA2007101024681A CN200710102468A CN101295918A CN 101295918 A CN101295918 A CN 101295918A CN A2007101024681 A CNA2007101024681 A CN A2007101024681A CN 200710102468 A CN200710102468 A CN 200710102468A CN 101295918 A CN101295918 A CN 101295918A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a soft switching method of an electric control switch of a three-phase alternating current input circuit, wherein the three-phase alternating current input circuit comprises a soft start circuit, and the method comprises the following steps after the soft start of the circuit is finished: detecting the six-segment wave head direct current; if the C phase of the three-phase alternating current is connected with the electric control switch in series, the electric control switch is attracted at any time between the zero-crossing point of the ab and ba sections and the voltage peak point of the ba/ab section; if the phase A of the three-phase alternating current is connected with the electric control switch in series, the electric control switch is attracted at any time between the zero-crossing point of the bc and cb sections and the voltage peak point of the cb/bc section; if the B phase of the three-phase alternating current is connected with the electric control switch in series, the B phase electric control switch is pulled in any time between the zero-crossing point of the ac section and the ca section and the voltage peak point of the ca/ac section. The invention controls the electric control switch to act when the voltage drop of the soft start circuit is minimum, so that the current peak on the electric control switch is minimum, and the service life of the relay is prolonged.
Description
Technical field
The present invention relates to power supply, particularly a kind of soft switching method for electric-controlled switch of three-phase AC input circuit.
Background technology
In the existing switch power module, the general circuit topology that all comprises as shown in Figure 1, comprise input soft starting circuit, rectification circuit, filter circuit (generally forming), main power source (forming), accessory power supply and supervisory circuit etc. by main DC/DC converter and its output filter circuit by filter capacitor, some Switching Power Supply also is provided with circuit of power factor correction between rectification circuit and main power source, i.e. pfc circuit.
Switch power module rigidly connects a period of time of alternating current for opening the machine process, open that input AC charges to the PFC bus capacitor in the machine process, because the pressure reduction of ac grid voltage and PFC bus capacitor voltage is very big, can produce very big impulse current in moment, therefore limit impulse current by the input soft starting circuit usually.Like this, PFC bus capacitor voltage rises gradually, and ac grid voltage and PFC bus capacitor voltage pressure reduction reduce gradually, and PFC bus capacitor charging current also will reduce.After soft start finished, control was connected with the electric-controlled switch that the input soft starting circuit is connected in parallel, and with the soft starting circuit short circuit, module enters normal operating conditions.
Yet in the process that electric-controlled switch is connected, the pressure drop of input soft starting circuit is transferred on the electric-controlled switch, produces bigger current spike on electric-controlled switch, reduces the life-span of electric-controlled switch.
Summary of the invention
The object of the present invention is to provide a kind of soft switching method for electric-controlled switch of three-phase AC input circuit, control, reduce its current spike in switching process by switching process to electric-controlled switch.
Technical scheme of the present invention is: a kind of soft switching method for electric-controlled switch of three-phase AC input circuit, described three-phase AC input circuit comprises soft starting circuit and AC/DC translation circuit, soft starting circuit two ends at least one cross streams incoming line are parallel with electric-controlled switch, and described AC/DC translation circuit is output as and comprises ab, ac, bc, ba, ca, the direct current of six sections wave heads of cb; The circuit soft start may further comprise the steps after finishing: A1, detect the described direct current that comprises six sections wave heads; A2, the electric-controlled switch if the C of three-phase alternating current has been in series is then at zero crossing and this electric-controlled switch of any time adhesive of the ascent stage between the ba/ab section voltage peak point of ab, ba section; The electric-controlled switch if the A of three-phase alternating current has been in series is then at zero crossing and this electric-controlled switch of any time adhesive of the ascent stage between the cb/bc section voltage peak point of bc, cb section; The electric-controlled switch if the B of three-phase alternating current has been in series, then any time adhesive B of the ascent stage between the zero crossing of ac, ca section and ca/ac section voltage peak point electric-controlled switch mutually.
As preferably, in the steps A 2, the electric-controlled switch if the C of three-phase alternating current has been in series is then at this electric-controlled switch of zero crossing adhesive of ab, ba section; The electric-controlled switch if the A of three-phase alternating current has been in series is then at this electric-controlled switch of zero crossing adhesive of bc, cb section; The electric-controlled switch if the B of three-phase alternating current has been in series is then at the zero crossing adhesive B of ac, ca section phase electric-controlled switch.
Further, described electric-controlled switch is a relay.
The present invention drops at the voltage of soft starting circuit by the control electric-controlled switch and moves in minimum, makes current spike minimum on the electric-controlled switch to improve the relay life-span.
Description of drawings
Fig. 1 is the electrical block diagram of a kind of three-phase AC input circuit among the present invention;
Fig. 2 is a rectification circuit output waveform figure among the present invention.
Embodiment
The present invention is further elaborated with specific embodiment with reference to the accompanying drawings below.
A kind of electric-controlled switch of three-phase AC input circuit 8 soft-switching process are applied to comprise in the Switching Power Supply of circuit topology as shown in Figure 1.This Switching Power Supply comprises electric-controlled switch 8, soft starting circuit 1, three-phase/single-phase translation circuit 2, rectification circuit 3, filter circuit 4, main power source 5, accessory power supply 6, supervisory circuit 7 and circuit of power factor correction (being pfc circuit, not shown) at least.Wherein, electric-controlled switch 8 is connected in series between the input of three-phase alternating current input (as AC among the figure) and three-phase/single-phase translation circuit 2, and soft starting circuit 1 is connected in parallel with electric-controlled switch 8.Three-phase/single-phase translation circuit 2 is converted to three-phase alternating current and outputs to rectification circuit 3 behind the single-phase alternating current and carry out rectification, outputs to main power source 5 and carry out the secondary rectification after filter circuit 4 carries out filtering, finally exports to load.Pfc circuit is connected between rectification circuit 3 and the main power source 5, and its PFC bus is connected to the input of accessory power supply 6.The output of accessory power supply 6 links to each other with supervisory circuit 7.The output signal of supervisory circuit 7 sends to three-phase/single-phase translation circuit 2.Because the Switching Power Supply topology of pfc circuit is basic general knowledge, and enforcement of the present invention be there is no crucial influence in this professional domain, pfc circuit is not drawn so have in the accompanying drawing of the present invention.
In the one embodiment of the invention, three electric-controlled switchs 8 are connected on respectively between three road three-phase alternating current inputs and the three-phase/single-phase translation circuit 2, and three soft starting circuits 1 are connected in parallel with corresponding electric-controlled switch 8 respectively.In the present embodiment, electric-controlled switch 8 adopts relay, and the coil tandem of relay is in supervisory circuit 7.In other embodiments of the invention, the device that electric-controlled switch 8 can adopt controllable silicon etc. to turn on and off by signal of telecommunication control circuit.Three-phase/single-phase translation circuit 2 is used for the three-phase alternating current of input is transformed to two-phase alternating current.Rectification circuit 3 is a diode bridge rectifier circuit, and the two-phase alternating current rectification that is used for three-phase/single-phase translation circuit 2 outputs is a direct current.Filter circuit 4 is used for the direct current of rectification circuit 3 outputs is carried out outputing to main power source 5 after the filtering.In the present embodiment, filter circuit 4 is made up of at least one filter capacitor.Main power source 5 is made up of main DC/DC converter and its output filter circuit, is used for the direct current of filter circuit 4 outputs is carried out the secondary rectifying conversion.Accessory power supply 6 is connected between pfc circuit and the supervisory circuit 7, and being used for provides power supply to monitoring and control circuit.Supervisory circuit 7 is connected between accessory power supply 6 and the three-phase/single-phase translation circuit 2, is used to gather and detect the work operation of control module.In other embodiments of the invention, can include only one or two electric-controlled switch 8, be connected in series in the arbitrary road or two-way in the three-phase input.
In normal running, after soft start finished, in the moment that electric-controlled switch 8 is connected, the pressure drop of soft starting circuit 1 had been added on the electric-controlled switch 8, and therefore the pressure drop of soft starting circuit 1 has at this moment directly determined the current spike size on the electric-controlled switch 8.As shown in Figure 2, the input AC electricity that changes of three phase sine does not control through three-phase that the voltage of (through three-phase/single-phase translation circuit 2 and rectification circuit 3 backs) has 6 wave heads after the rectification.Like this, in the sinusoidal period of three-phase input AC electricity PFC bus capacitor charging in the pfc circuit is divided into 6 sections, comprises ab, ac, bc, ba, ca, cb.
Yi Zhi, when ab (ba) section voltage reaches peak value, the pressure drop minimum on the soft starting circuit that C goes up mutually, the electric-controlled switch (as KC among Fig. 2) of adhesive this moment C phase, the electric-controlled switch current spike minimum that C goes up mutually.Same, when bc (cb) section voltage reaches peak value, pressure drop minimum on the soft starting circuit that A goes up mutually, the electric-controlled switch (as KA among Fig. 2) of adhesive this moment A phase, the electric-controlled switch current spike minimum that A goes up mutually.When ac (ca) section voltage reaches peak value, pressure drop minimum on the soft starting circuit that B goes up mutually, the electric-controlled switch (as KB among Fig. 2) of adhesive this moment B phase, the electric-controlled switch current spike minimum that B goes up mutually.
In one embodiment of the present of invention, use two electric-controlled switchs 8, the A that is connected on the three-phase alternating current input respectively goes up mutually with C mutually.After AC network powers on, under soft starting circuit 1 metering function, give the charging of PFC bus capacitor, (the pfc busbar voltage provides energy to accessory power supply 6 in accessory power supply 6 foundation, accessory power supply 6 need than higher pfc voltage by energy conversion, become low-voltage DC, suitable energy be provided for various chips of inside modules and components and parts), supervisory circuit 7 is started working.After the soft start charging was finished, supervisory circuit 7 detected AC-input voltage.Suppose that the three phase network operating frequency is at 50Hz～60Hz (20mS～16.7mS), consider the time-delay (as 5mS) of electric-controlled switch 8, when supervisory circuit 7 detects the electric-controlled switch of AC-input voltage in the zero crossing adhesive C of ab, ba section phase, inhale electric-controlled switch mutually with A at the zero crossing of bc, cb section.So just can reduce exchanging the input overshoot current to greatest extent, reach the effect of protection relay.
Among other embodiment of the present invention; concrete parameter according to electric-controlled switch 8; can be at the ab in the 6 wave head direct currents; the C of adhesive sometime of ascent stage between the zero crossing of ba section and ba (or ab) the section voltage peak point is electric-controlled switch 8 mutually; at bc; the A of adhesive sometime of ascent stage between the zero crossing of cb section and cb (or bc) the section voltage peak point is electric-controlled switch 8 mutually; at ac; the B of adhesive sometime of ascent stage between the zero crossing of ca section and ca (or ac) the section voltage peak point is electric-controlled switch 8 mutually; can reduce exchanging the input overshoot current to greatest extent, reach the effect of protection relay.
Claims (3)
1, a kind of soft switching method for electric-controlled switch of three-phase AC input circuit, described three-phase AC input circuit comprises soft starting circuit and AC/DC translation circuit, soft starting circuit two ends at least one cross streams incoming line are parallel with electric-controlled switch, and described AC/DC translation circuit is output as and comprises ab, ac, bc, ba, ca, the direct current of six sections wave heads of cb; It is characterized in that the circuit soft start may further comprise the steps after finishing:
A1 detects the described direct current that comprises six sections wave heads;
A2, the electric-controlled switch if the C of three-phase alternating current has been in series is then at zero crossing and this electric-controlled switch of any time adhesive of the ascent stage between the ba/ab section voltage peak point of ab, ba section; The electric-controlled switch if the A of three-phase alternating current has been in series is then at zero crossing and this electric-controlled switch of any time adhesive of the ascent stage between the cb/bc section voltage peak point of bc, cb section; The electric-controlled switch if the B of three-phase alternating current has been in series, then any time adhesive B of the ascent stage between the zero crossing of ac, ca section and ca/ac section voltage peak point electric-controlled switch mutually.
2, method according to claim 1 is characterized in that: in the steps A 2, the electric-controlled switch if the C of three-phase alternating current has been in series is then at this electric-controlled switch of zero crossing adhesive of ab, ba section; The electric-controlled switch if the A of three-phase alternating current has been in series is then at this electric-controlled switch of zero crossing adhesive of bc, cb section; The electric-controlled switch if the B of three-phase alternating current has been in series is then at the zero crossing adhesive B of ac, ca section phase electric-controlled switch.
3, method according to claim 1 and 2 is characterized in that: described electric-controlled switch is a relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101024681A CN101295918B (en) | 2007-04-24 | 2007-04-24 | Soft switching method for electric control switch of three-phase alternating-current input circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101024681A CN101295918B (en) | 2007-04-24 | 2007-04-24 | Soft switching method for electric control switch of three-phase alternating-current input circuit |
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| CN101295918A true CN101295918A (en) | 2008-10-29 |
| CN101295918B CN101295918B (en) | 2011-03-02 |
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| CN2007101024681A Active CN101295918B (en) | 2007-04-24 | 2007-04-24 | Soft switching method for electric control switch of three-phase alternating-current input circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427618A (en) * | 2013-06-24 | 2013-12-04 | 深圳市英威腾电气股份有限公司 | Soft start control circuit |
| CN111211698A (en) * | 2020-01-22 | 2020-05-29 | 宁波奥克斯电气股份有限公司 | AC-AC frequency conversion control method and device with continuous output frequency and air conditioner |
| CN112152428A (en) * | 2020-09-30 | 2020-12-29 | 科华恒盛股份有限公司 | Three-phase thyristor control circuit |
| CN112511145A (en) * | 2020-12-04 | 2021-03-16 | 深圳市金威源科技股份有限公司 | Standby zero reactive power consumption control circuit in switching power supply |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6068511A (en) * | 1983-09-21 | 1985-04-19 | 株式会社富士電機総合研究所 | Method of breaking 3-phase shortcircuiting current |
| CN1022155C (en) * | 1991-06-25 | 1993-09-15 | 华北石油管理局通讯处 | Method for controlling ac asynchronous motor by microcomputer |
| CA2298583C (en) * | 1998-07-16 | 2004-08-31 | Mitsubishi Denki Kabushiki Kaisha | Synchronous switching apparatus for use with a multiple phase power sys tem |
| NL1018960C2 (en) * | 2001-09-14 | 2003-03-17 | Holec Holland Nv | Three-phase system with a switch-on device for controlled switching of a load network on a three-phase power source. |
| CN100382416C (en) * | 2004-12-31 | 2008-04-16 | 海尔集团公司 | Variable-frequency air-condition power supply power factor correcting device |
-
2007
- 2007-04-24 CN CN2007101024681A patent/CN101295918B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103427618A (en) * | 2013-06-24 | 2013-12-04 | 深圳市英威腾电气股份有限公司 | Soft start control circuit |
| CN103427618B (en) * | 2013-06-24 | 2016-05-11 | 深圳市英威腾电气股份有限公司 | A kind of SS (soft start) control circuit |
| CN111211698A (en) * | 2020-01-22 | 2020-05-29 | 宁波奥克斯电气股份有限公司 | AC-AC frequency conversion control method and device with continuous output frequency and air conditioner |
| CN112152428A (en) * | 2020-09-30 | 2020-12-29 | 科华恒盛股份有限公司 | Three-phase thyristor control circuit |
| CN112152428B (en) * | 2020-09-30 | 2022-06-07 | 科华恒盛股份有限公司 | Three-phase thyristor control circuit |
| CN112511145A (en) * | 2020-12-04 | 2021-03-16 | 深圳市金威源科技股份有限公司 | Standby zero reactive power consumption control circuit in switching power supply |
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| CN101295918B (en) | 2011-03-02 |
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Effective date of registration: 20110322 Address after: Forty-four thousand and fifty-two The United States of Ohio city F Lorain Street No. 1122 Patentee after: Emerson Network Power Co., Ltd. Address before: Sweden Stockholm Taylor's grid Street No. 1 Patentee before: Emerson Network Power Co., Ltd. |
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Address after: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee after: Walteff energy systems company Address before: The United States of Ohio city F Lorain Street No. 1122 Patentee before: Emerson Network Power Co., Ltd. |
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Effective date of registration: 20211221 Address after: Ohio, USA Patentee after: Dimension Corp. Address before: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee before: VERTIV ENERGY SYSTEMS, Inc. |
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