CN204156762U - A kind of three phase electric machine current over-zero checkout gear of Electronic Soft Starter - Google Patents

A kind of three phase electric machine current over-zero checkout gear of Electronic Soft Starter Download PDF

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Publication number
CN204156762U
CN204156762U CN201420582271.8U CN201420582271U CN204156762U CN 204156762 U CN204156762 U CN 204156762U CN 201420582271 U CN201420582271 U CN 201420582271U CN 204156762 U CN204156762 U CN 204156762U
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China
Prior art keywords
circuit
rectification
signal
electric machine
checkout gear
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Expired - Fee Related
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CN201420582271.8U
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Chinese (zh)
Inventor
肖永军
丁幺明
熊曾刚
黄永林
李纪平
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Hubei Engineering University
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Hubei Engineering University
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Priority to CN201420582271.8U priority Critical patent/CN204156762U/en
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Publication of CN204156762U publication Critical patent/CN204156762U/en
Expired - Fee Related legal-status Critical Current
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Abstract

A three phase electric machine current over-zero checkout gear for Electronic Soft Starter, is characterized in that, comprises the thyristor circuit 1, rectification circuit 2, photoelectric coupled circuit 3, filter circuit 4, the negative circuit 5 that connect successively; Thyristor circuit comprises and being made up of 6 silicon controlled crystal brake pipes VT1, VT2, VT3, VT4, VT5, VT6; Rectification circuit is comprise the rectifier bridge be made up of diode D1, D2, D3 and D4, and described rectifier bridge is in order to the AC signal rectification gathered from motor stator, forms the direct current signal of pulsation; Pulsating direct current signal after rectification, through photoelectric coupled circuit, is become pulse signal, and input and output is isolated by the direct current signal after rectification; The pulse signal of described output is delivered to negative circuit 5 and does further shaping after the interference signal of low pass filter filter out power side; This device has stronger anti-industrial interference ability.

Description

A kind of three phase electric machine current over-zero checkout gear of Electronic Soft Starter
Technical field
The utility model relates to Aulomatizeted Detect field, particularly relates to the three phase electric machine current over-zero checkout gear of Electronic Soft Starter.
Background technology
The three phase electric machine that Electronic Soft Starter works is inductive load system, inputs to voltage in motor and electric current has certain phase difference, i.e. current lagging voltage afterflow angle.The detection of three-phase motor stator current over-zero not only can effectively measure motor power factor angle, what more can be IGBT group conducting provides time reference, repeated trigger when avoiding stator current not end and cause system failure, it has very important effect in whole Electronic Soft Starter design.At present, the current over-zero checkout gear major part that tradition uses is employing take current transformer as the interlock circuit that core is formed, because instrument transformer is subject to operational environment interference, there is the defect of interference free performance difference in which, inapplicable when more severe for industry control external environment.
Utility model content
For overcoming the problems referred to above, the utility model proposes a kind of three phase electric machine current over-zero checkout gear of Electronic Soft Starter.
The technical solution of the utility model is:
A three phase electric machine current over-zero checkout gear for Electronic Soft Starter, is characterized in that, comprises the thyristor circuit 1, rectification circuit 2, photoelectric coupled circuit 3, filter circuit 4, the negative circuit 5 that connect successively;
Thyristor circuit comprises and being made up of 6 silicon controlled crystal brake pipes VT1, VT2, VT3, VT4, VT5, VT6, and wherein the anode of VT1 and VT2 is connected between two with negative electrode, and the anode of VT3 and VT4 is connected between two with negative electrode, and the anode of VT5, VT6 is connected between two with negative electrode;
Rectification circuit is comprise the rectifier bridge be made up of diode D1, D2, D3 and D4, and described rectifier bridge is in order to the AC signal rectification gathered from motor stator, forms the direct current signal of pulsation;
Pulsating direct current signal after rectification, through photoelectric coupled circuit, is become pulse signal, and input and output is isolated by the direct current signal after rectification; The pulse signal of described output is delivered to negative circuit 5 and does further shaping after the interference signal of low pass filter filter out power side;
Negative circuit 5 is made up of inverter.
Further, described rectification circuit also comprises electric capacity C1, C2, C4 and C5 of being connected in D1, D2, D3 and D4 two ends in parallel, and electric capacity C1, C2, C4 and C5 are used for preventing diode both end voltage from suddenling change, protection rectifier diode.
Further, before rectification circuit, be connected with power resistor R1, play metering function, for the protection of subsequent conditioning circuit.
Further, the photoelectric coupled circuit electric capacity C6, resistance R2 and the electric capacity C7 that comprise high speed photo coupling 6N139 and be connected with optocoupler 6N139.
Further, described negative circuit is made up of 2 inverter series.
The utility model has the advantage of, the design adopts rapid light coupling, inverter and a small amount of resistance, electric capacity, diode form testing circuit, by input being connected on the thyristor of two pairings, the extraction of three phase electric machine current zero-crossing signal can be carried out, because adopting high speed photo coupling and inverter, this circuit has stronger anti-industrial interference ability.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is rectification circuit, photoelectric coupled circuit, filter circuit, negative circuit circuit diagram;
Fig. 3 is thyristor circuit wiring schematic diagram;
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with diagram and specific embodiment, setting forth the utility model further.
As shown in Figure 1, three phase electric machine current over-zero checkout gear, comprises the thyristor circuit 1, rectification circuit 2, photoelectric coupled circuit 3, filter circuit 4, the negative circuit 5 that connect successively.
Be illustrated in figure 2 the wiring schematic diagram of thyristor circuit 1, the output of motor is connected with thyristor circuit 1, thyristor circuit comprises and being made up of 6 silicon controlled crystal brake pipes VT1, VT2, VT3, VT4, VT5, VT6, wherein the anode of VT1 and VT2 is connected between two with negative electrode, the anode of VT3 and VT4 is connected between two with negative electrode, and the anode of VT5, VT6 is connected between two with negative electrode.In triggering phase sequence, the mutual deviation between VT1, VT3 and VT5 of common cathode group 120 °, the mutual deviation between VT4, VT6 and VT2 120 ° of anode unit altogether, be connected on two pipes of same phase, as mutual deviation between VT1 and VT4, VT3 and VT6, VT5 and VT2 180 °, the trigger sequence of thyristor is AB, BC and CA, element conducting when respective power electric positive pressure half cycle of common cathode group, altogether the element then conducting when its supply voltage negative half period of anode unit.
As shown in Figure 2, rectification circuit is comprise the rectifier bridge be made up of diode D1, D2, D3 and D4, and being connected in electric capacity C1, C2, C4 and the C5 at D1, D2, D3 and D4 two ends in parallel, electric capacity C1, C2, C4 and C5 are used for preventing diode both end voltage from suddenling change, protection rectifier diode; Described rectifier bridge, in order to the AC signal rectification gathered from motor stator, forms the direct current signal of pulsation.Wherein, before rectification circuit, be connected with power resistor R1, play metering function, for the protection of subsequent conditioning circuit;
Pulsating direct current signal after rectification, through photoelectric coupled circuit, is become pulse signal, and input and output is isolated by the direct current signal after rectification; After the interference signal of the low pass filter filter out power side that the pulse signal of described output forms through R4, C8.
Electric capacity C6, resistance R2 and electric capacity C7 that photoelectric coupled circuit comprises high speed photo coupling 6N139 and is connected with high speed photo coupling 6N139, electric capacity C6, resistance R2 and electric capacity C7 are used for and 6N139 forms corresponding application circuit, to reach the function of 6N139.R3 is pull-up resistor, is the saturation pulse signal of 0-VCC for the formation of amplitude.
Because the signal after filtering is nonideal waveform signal, for avoiding microprocessor detect mistake and false triggering thyristor, the signal through filtering is delivered to negative circuit and do further shaping, negative circuit is composed in series by 74LS14.
Its operation principle of three phase electric machine zero cross detection circuit is as follows: after AB phase triggers, and VT1 and VT4 conducting exists the electric current of change in three-phase motor stator, now this signal is after bridge rectifier rectification, 6N139 conducting, then output is low level.After three-phase electricity voltage zero-cross, after certain hour, thyristor VT1 and VT4 ends, no current in three-phase motor stator.Then 6N139 by, then 74LS14 input side is then the high level of nearly VCC, and the output of whole circuit is voltage is VCC.When other is conducted and ends, whole circuit also can be caused to export the pulse signal of 0-VCC, and the rising edge of this pulse signal is the moment of three phase electric machine current over-zero.Inputed to the INTM interrupt pin of the controller of Electronic Soft Starter by this signal, when rising edge arrives, at once cause Single-chip Controlling to produce and interrupt, the moment of three phase electric machine current over-zero can be detected.
This device adopts rapid light coupling, inverter and a small amount of resistance, electric capacity, diode form testing circuit, by input being connected on the thyristor of two pairings, the extraction of three phase electric machine current zero-crossing signal can be carried out, because adopting high speed photo coupling and inverter, this circuit has stronger anti-industrial interference ability.
More than show and describe general principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.

Claims (5)

1. the three phase electric machine current over-zero checkout gear of an Electronic Soft Starter, it is characterized in that, comprise the thyristor circuit (1), rectification circuit (2), photoelectric coupled circuit (3), filter circuit (4), the negative circuit (5) that connect successively;
Thyristor circuit comprises and being made up of 6 silicon controlled crystal brake pipes VT1, VT2, VT3, VT4, VT5, VT6, and wherein the anode of VT1 and VT2 is connected between two with negative electrode, and the anode of VT3 and VT4 is connected between two with negative electrode, and the anode of VT5, VT6 is connected between two with negative electrode;
Rectification circuit is comprise the rectifier bridge be made up of diode D1, D2, D3 and D4, and described rectifier bridge is in order to the AC signal rectification gathered from motor stator, forms the direct current signal of pulsation;
Pulsating direct current signal after rectification, through photoelectric coupled circuit, is become pulse signal, and input and output is isolated by the direct current signal after rectification; The pulse signal of described output is delivered to negative circuit (5) and does further shaping after the interference signal of low pass filter filter out power side;
Negative circuit (5) is made up of inverter.
2. the three phase electric machine current over-zero checkout gear of a kind of Electronic Soft Starter according to claim 1; it is characterized in that; described rectification circuit also comprises electric capacity C1, C2, C4 and C5 of being connected in D1, D2, D3 and D4 two ends in parallel; electric capacity C1, C2, C4 and C5 are used for preventing diode both end voltage from suddenling change, protection rectifier diode.
3. the three phase electric machine current over-zero checkout gear of a kind of Electronic Soft Starter according to claim 1, is characterized in that, be connected with power resistor R1, play metering function, for the protection of subsequent conditioning circuit before rectification circuit.
4. the three phase electric machine current over-zero checkout gear of a kind of Electronic Soft Starter according to claim 1, is characterized in that, electric capacity C6, resistance R2 and electric capacity C7 that photoelectric coupled circuit comprises high speed photo coupling 6N139 and is connected with optocoupler 6N139.
5. the three phase electric machine current over-zero checkout gear of a kind of Electronic Soft Starter according to claim 1, is characterized in that, described negative circuit is made up of 2 inverter series.
CN201420582271.8U 2014-10-09 2014-10-09 A kind of three phase electric machine current over-zero checkout gear of Electronic Soft Starter Expired - Fee Related CN204156762U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420582271.8U CN204156762U (en) 2014-10-09 2014-10-09 A kind of three phase electric machine current over-zero checkout gear of Electronic Soft Starter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420582271.8U CN204156762U (en) 2014-10-09 2014-10-09 A kind of three phase electric machine current over-zero checkout gear of Electronic Soft Starter

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CN204156762U true CN204156762U (en) 2015-02-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106301090A (en) * 2016-10-21 2017-01-04 宁波市艾霖信息科技有限公司 A kind of weak electricity measuring system and method controlling equipment based on intelligent soft starter
CN113406382A (en) * 2021-07-12 2021-09-17 华中科技大学 Low-cost power distribution network PMU and working method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106301090A (en) * 2016-10-21 2017-01-04 宁波市艾霖信息科技有限公司 A kind of weak electricity measuring system and method controlling equipment based on intelligent soft starter
CN113406382A (en) * 2021-07-12 2021-09-17 华中科技大学 Low-cost power distribution network PMU and working method thereof

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150211

Termination date: 20211009