CN1047482C - Automatic electronic air-switch - Google Patents
Automatic electronic air-switch Download PDFInfo
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- CN1047482C CN1047482C CN94118377A CN94118377A CN1047482C CN 1047482 C CN1047482 C CN 1047482C CN 94118377 A CN94118377 A CN 94118377A CN 94118377 A CN94118377 A CN 94118377A CN 1047482 C CN1047482 C CN 1047482C
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- halfwave rectifier
- electronic air
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Abstract
The present invention relates to an electronic air switch which comprises a three-phase switching main switch, a current sampling circuit, a voltage transformer isolating circuit, an active precise half-wave rectifying and amplifying circuit, a three-phase average value circuit, a three-phase peak value detecting circuit, a current regulating circuit, an inverse time-limit circuit, a voltage comparing and amplifying circuit, an executive circuit for switching off a tripping coil, and a machine tripping device. The present invention is characterized in that the automatic electronic air switch also comprises a three-phase unbalance protection circuit and a non-overloading discharge circuit. The present invention is a novel product for replacing original automatic air switches, and is suitable for protection of overloading, phase failure and three-phase unbalance short circuit of power distribution equipment and three-phase equipment and protection of serious three-phase unbalance caused by other reasons.
Description
The present invention relates to a kind of automatic electronic air-switch, be used for three-phase distribution and three-phase equipment overload, the phase failure, three-phase imbalance short circuit and other cause serious three-phase imbalance protection.
Automatic air-break switch (as DZ10-100) in the market, generally be to adopt the work of bimetallic thermal deformation, owing to being subjected to reasons such as mechanical fatigue, ambient temperature, usually when automatic air-break switch moves, motor strains or burns, and causes bigger economic loss.In addition, in mechanical type automatic air-break switch when work,, energy consumption is big, does not have functions such as open phase protection and current value be adjustable, is difficult to adapt to the occasion of independent control motor.Though also occur some electronic type automatic air-break switches on the market, current sampling partly adopts current transformer, volume is big, poor sensitivity, and the price height does not have the electrical characteristics and the thermal characteristics of complete simulating motor, and the restriction automatic electronic air-switch is promoted.
Purpose of the present invention: the electronic circuit that provides the more satisfactory simulation electric electromechanics of a kind of energy characteristic and thermal characteristics is multi-functional with the formation that former automatic air-break switch machinery trip gear combines, high accuracy, the adjustable automatic electronic air-switch of current value.
In order to reach above-mentioned purpose of the present invention, automatic electronic air-switch of the present invention, possesses the electronic circuit that mechanical trip gear is arranged and make this machinery trip gear action, this electronic circuit comprises: the three-phase main switch, this three-phase main switch output termination current sampling circuit, this current sampling circuit output termination alternating current motor and voltage transformer buffer circuit, this voltage transformer buffer circuit output is connected to the accurate halfwave rectifier amplifying circuit in source, this active accurate halfwave rectifier amplification circuit output end connects three-phase average value filtering circuit and three-phase peak-detector circuit, this three-phase peak-detector circuit output termination current regulating circuit, this current regulating circuit output termination inverse time lag circuit, and voltage contrasting amplified circuit output termination tripping coil turn-offs executive circuit, this tripping coil turn-offs executive circuit makes this machinery trip gear move this three-phase main switch of break-make, wherein this electronic circuit also comprises three-phase imbalance protective circuit and non-overload discharge circuit, and this three-phase imbalance protective circuit is made up of integrated voltage comparator, its anode, negative terminal, output is connected on electric capacity (C1) anode of three-phase average value filtering circuit respectively, the resistance of current regulating circuit (R8) hot end, voltage contrasting amplified circuit voltage-stabiliser tube (V1) hot end; This non-overload discharge circuit is connected between electric capacity (C3) anode of potentiometer (RP) centre cap of current regulating circuit and inverse time lag circuit.
This automatic electronic air-switch has the phase failure, three-phase imbalance short-circuit protection and overload protection function, and makes ambient temperature, and the change in voltage influence is little, and the accuracy height is low in energy consumption.
Present embodiment, the automatic air of selecting 50A in the DZ10-100 series for use is an example, describes the present invention in detail.
Fig. 1 is automatic electronic air-switch, alternating current motor Control work functional-block diagram.
Fig. 2 is an automatic electronic air-switch electronic circuit fundamental diagram.
By Fig. 1, Fig. 2, present embodiment is one and has overload, disconnected phase, three-phase Unbalanced short circuit and other cause the electronics of severe three-phase unbalance protection function The formula automatic air-break switch is by three-phase main switch, ac motor, current sampling Circuit, voltage transformer buffer circuit, active accurate halfwave rectifier amplifying circuit, Three-phase average value filtering circuit, three-phase peak-detector circuit, current regulating circuit, Inverse time lag circuit, voltage contrasting amplified circuit, tripping coil turn-off executive circuit, Mechanical release devices etc. partly form. Inverse time lag circuit two ends also connect a non-mistake Put circuit, this circuit is by integrated voltage comparator N4 and output electricity thereof Resistance R9 forms the positive termination current regulating circuit of integrated voltage comparator potentiometer RP centre cap, negative terminal connect the high electricity of voltage contrasting amplified circuit voltage-stabiliser tube V1 The position end, output connects inverse time lag circuit delay capacitor C 3 anodes through R9. Instead Series circuit and electricity that timing circuit is made up of voltage-stabiliser tube V3 and resistance R 11 Resistance R10 parallel connection, be in series with delay capacitor C3 and form again. The experiment card Bright, as long as accurately calculate the anti-time limit characteristic of said elements bimetal leaf. Set up The purpose of non-overload discharge circuit is will by this circuit when the non-overload of motor Delay capacitor C3 anode is clamped at zero potential, provides one for delay capacitor C3 Bar is discharge paths over the ground, with charge constant and discharge time constant analog electrical Engine temperatures rise and fall time constant is with voltage analog electricity on the capacitor C 3 Engine temperatures is not when the motor operation electric current has overrate, on the electric capacity Voltage be always zero.
Existing automatic electronic air-switch overload protection is that the series-parallel circuit that utilizes voltage-stabiliser tube, resistance, electric capacity to form is formed, because the voltage-stabiliser tube electric leakage, and interference signal slowly rises capacitance voltage, causes misoperation.Do not provide an electric charge to discharge branch road to electric capacity, capacitance voltage is difficult to the simulating motor temperature rise.Therefore, at inverse time lag circuit two ends and to connect non-overload discharge circuit be key character of the technology of the present invention difference prior art.
Connect the three-phase imbalance protective circuit between three-phase average value filtering circuit, current regulating circuit, the voltage contrasting amplified circuit.This circuit is made up of integrated voltage comparator N1, N2, N3, and its anode connects three-phase average value filtering circuit capacitance C1 anode respectively, and negative terminal is connected on current regulating circuit resistance R 8 hot ends simultaneously, output termination voltage contrasting amplified circuit voltage-stabiliser tube V1 hot end.The purpose that this circuit is set is serious uneven operating state (as short circuit between phase shortage, two alternate short circuits, phase and ground etc.) time to occur at motor to protect the simulating motor electrical characteristics.
As three-phase A, B, C is arbitrary when the phase failure occurring mutually, it is electronegative potential that this phase average value filtering circuit capacitance C1 goes up voltage drop, current regulating circuit R8 hot end voltage depends on that the three-phase peak-detector circuit keeps capacitor C 2 voltages, therefore the positive terminal voltage of three-phase imbalance protective circuit integrated voltage comparator is lower than negative terminal voltage, and output is become in zero potential by original high potential (voltage-stabiliser tube V1 voltage stabilizing value); The positive terminal voltage of voltage contrasting amplified circuit integrated operational amplifier is higher than negative terminal voltage, its defeated end is a high potential by original zero potential upset, make this triode saturated rapidly through triode V2 and base resistance R13 thereof, tripping coil gets, the action of machinery trip gear, the three-phase main switch cuts off the three-phase main power source immediately.
As three-phase A; B; C is arbitrary when shorted to earth occurring mutually; big electric current will cause this mutually active accurate halfwave rectifier amplifying circuit integrated operational amplifier output current potential sharply to rise and be saturated rapidly; current regulating circuit resistance R 8 hot end current potentials sharply rise; because detector diode buffer action; voltage on the two-phase average value filtering circuit capacitance C1 remains unchanged in addition; by current regulating circuit resistance R 7; R8; potentiometer RP parameter designing; three-phase imbalance protective circuit integrated voltage comparator negative terminal voltage is higher than positive terminal voltage; this two-phase integrated voltage comparator output is overturn in zero potential by high potential (voltage-stabiliser tube V1 voltage stabilizing value), and process voltage contrasting amplified circuit and tripping coil shutoff executive circuit are swift in motion mechanical trip gear and cut off the three-phase main power source.
If during two alternate short circuits; biphase current sharply increases; according to single-phase shorted to earth analysis; make another phase integrated voltage comparator output zero potential in the three-phase imbalance protective circuit equally, process voltage contrasting amplified circuit and tripping coil shutoff executive circuit are swift in motion mechanical trip gear and cut off the three-phase main power source.
If A, B, C occur serious uneven; as long as make the integrated voltage comparator negative terminal current potential of three-phase imbalance protective circuit be higher than positive terminal potential; its output zero potential can occur equally; turn-off executive circuit through voltage contrasting amplified circuit and tripping coil, make mechanical trip gear action cut off the three-phase main power source.
Because the automatic electronic air-switch short-circuit protection designs according to actual current value and load current value ratio at present, therefore, must avoid the motor starting electric current, especially in control multiple motors occasion, situation is complicated more.The technical solution used in the present invention; be to utilize the three-phase imbalance principle; as long as wherein one mutually or biphase current during greater than other two-phase or phase several times; the Electronic Protection circuit just plays a role; dexterously the phase failure, relative ground circuit, two alternate short circuits and other being produced serious three-phase imbalance state and be unified in a kind of circuit, is another key character of the technology of the present invention and prior art.
Current sampling adopts copper resistance R4, RB, RC as transducer.Copper resistance RA, RB, RC are connected in the motor main circuit respectively, its two terminations voltage transformer TV1, TV2, TV3's is elementary, minute-pressure on the copper resistance is fallen and can be reflected alternating current motor operating current size truly, and air switch is operated in the low-grade fever state, and energy-saving effect is particularly remarkable.The accurate halfwave rectifier amplifying circuit in the source that between voltage transformer buffer circuit and three-phase peak-detector circuit, is connected to, this circuit is by biasing resistor R1, R2, and series resistance R3, the R4 between integrated operational amplifier T1, T2, T3 and output thereof, negative terminal, biasing resistor R1, the R2 tie point forms.The purpose that this circuit is set is carried out halfwave rectifier with the isolating transformer secondary voltage on the one hand, on the other hand this voltage high-fidelity is amplified, when even motor is operated in zero load, also can obtain bigger d. c. voltage signal at its output, obtain d. c. voltage signal with the current transformer of electronic type automatic air-break switch employing in the market and compare, have tangible advantage (distortion is little, amplitude is big).The purpose that biasing resistor R1, R2 are set is an automatic air-break switch when bringing onto load not; can close a floodgate in the same old way; principle is that three-phase average value filtering circuit capacitance C1 has a fixing faint direct voltage, makes three-phase imbalance protective circuit integrated voltage comparator output be in high potential all the time.Connect the three-phase peak-detector circuit between active accurate halfwave rectifier amplifying circuit and the current regulating circuit, the purpose that this circuit is set is to make in current regulating circuit potentiometer RP hot end voltage depend on that the accurate halfwave rectifier amplifying circuit of three-phase active voltage magnitude is the phase crest voltage to the maximum.
The automatic electronic air-switch current specification within the specific limits among Fig. 2, by series resistance R3, the decision of R4 ratio between output, negative terminal and the biasing resistor R1 of integrated operational amplifier T1, T2, T3 in the active accurate halfwave rectifier amplifying circuit, the R2 tie point,, bring great convenience as long as change the automatic electronic air-switch that R3, R4 ratio just can conveniently produce different size for same specification current sampling transducer RA, RB, RC to production.
Inverse time lag circuit input end voltage signal size, depend on potentiometer RP centre cap position in the current regulating circuit, in a certain current range to the motor of different rated current, as long as change potentiometer RP centre cap position, just can obtain same output voltage signal, this voltage and motor power (output) are irrelevant, and be only relevant with the motor load multiple, reduced the automatic electronic air-switch current specification, brought great convenience for production and use.
Comprehensive only described, this automatic electronic air-switch is compared with former automatic air-break switch, has the following advantages:
1, has disconnected phase, three-phase imbalance short-circuit protection and other cause serious three
The phase unbalance protection has been widened the application model of automatic electronic air-switch
Enclose.
2, adopt integrated circuit, make ambient temperature, the change in voltage influence is little, standard
The exactness height.
3, realize overload protection function with electronic component, precision height, low in energy consumption.
4, use same specification copper resistance, can produce and produce multiple easily
The automatic electronic air-switch of different size, so this electronics is empty automatically
Air cock is that a kind of can to substitute former automatic air-break switch practicality very strong
Electric equipment products.
Claims (10)
1, a kind of automatic electronic air-switch, possesses the electronic circuit that mechanical trip gear is arranged and make this machinery trip gear action, this electronic circuit comprises: the three-phase main switch, this three-phase main switch output termination current sampling circuit, this current sampling circuit output termination alternating current motor and voltage transformer buffer circuit, this voltage transformer buffer circuit output is connected to the accurate halfwave rectifier amplifying circuit in source, this active accurate halfwave rectifier amplification circuit output end connects three-phase average value filtering circuit and three-phase peak-detector circuit, this three-phase peak-detector circuit output termination current regulating circuit, this current regulating circuit output termination inverse time lag circuit, and voltage contrasting amplified circuit output termination tripping coil turn-offs executive circuit, this tripping coil turn-offs executive circuit makes this machinery trip gear move this three-phase main switch of break-make, it is characterized in that:
This electronic circuit also comprises three-phase imbalance protective circuit and non-overload discharge circuit, and this three-phase imbalance protective circuit is made up of integrated voltage comparator, and its anode, negative terminal, output are connected on electric capacity (C1) anode, resistance (R8) hot end of current regulating circuit, voltage contrasting amplified circuit voltage-stabiliser tube (V1) hot end of three-phase average value filtering circuit respectively; This non-overload discharge circuit is connected between electric capacity (C3) anode of potentiometer (RP) centre cap of current regulating circuit and inverse time lag circuit.
2, according to claims 1 described automatic electronic air-switch, it is characterized in that current sampling circuit adopts copper resistance (RA, RB, RC), be connected in the inner three-phase main circuit of automatic air-break switch.
3, according to claims 1 or 2 described automatic electronic air-switchs, it is characterized in that being connected between voltage transformer buffer circuit and the three-phase peak-detector circuit the accurate halfwave rectifier amplifying circuit in source, form by series resistance (R3, R4) between biasing resistor (R1, R2), integrated operational amplifier (T1, T2, T3) and output thereof, negative terminal, the biasing resistor tie point.
4, according to claims 1 or 2 described automatic electronic air-switchs, it is characterized in that connecing the three-phase peak-detector circuit between active accurate halfwave rectifier amplifying circuit and the current regulating circuit, its input is connected with active accurate halfwave rectifier amplification circuit output end by detector diode (VD), and output is connected with current regulating circuit potentiometer (R.P) hot end by keeping electric capacity (C2).
5, according to claims 3 described automatic electronic air-switchs, it is characterized in that connecing the three-phase peak-detector circuit between active accurate halfwave rectifier amplifying circuit and the current regulating circuit, its input is connected with active accurate halfwave rectifier amplification circuit output end by detector diode (VD), and output is connected with current regulating circuit potentiometer (RP) hot end by keeping electric capacity (C2).
6, according to claim 1,2 and 5 each described automatic electronic air-switchs; it is characterized in that connecing three-phase average value filtering circuit between active accurate halfwave rectifier amplifying circuit and the three-phase imbalance protective circuit; this circuit is composed in series by current-limiting resistance (R5) and filter capacitor (C1); current-limiting resistance (R5) hot end is connected to the accurate halfwave rectifier amplification circuit output end in source, electronegative potential termination three-phase imbalance protective circuit integrated voltage comparator (N1, N2, N3) anode.
7, automatic electronic air-switch according to claim 3; it is characterized in that connecing three-phase average value filtering circuit between active accurate halfwave rectifier amplifying circuit and the three-phase imbalance protective circuit; this circuit is composed in series by current-limiting resistance (R5) and filter capacitor (C1); current-limiting resistance (R5) hot end is connected to the accurate halfwave rectifier amplification circuit output end in source, electronegative potential termination three-phase imbalance protective circuit integrated voltage comparator (N1, N2, N3) anode.
8, automatic electronic air-switch according to claim 4; it is characterized in that connecing three-phase average value filtering circuit between active accurate halfwave rectifier amplifying circuit and the three-phase imbalance protective circuit; this circuit is composed in series by current-limiting resistance (R5) and filter capacitor (C1); current-limiting resistance (R5) hot end is connected to the accurate halfwave rectifier amplification circuit output end in source, electronegative potential termination three-phase imbalance protective circuit integrated voltage comparator (N1, N2, N3) anode.
9, according to claims 1,2 and 5 each described automatic electronic air-switchs, it is characterized in that the three-phase peak-detector circuit is kept between electric capacity (C2) anode and the inverse time lag circuit input end connects current regulating circuit, this circuit is composed in series by potentiometer (RP), resistance (R7, R8), potentiometer high potential termination is kept electric capacity (C2) anode, and centre cap connects the inverse time lag circuit input end.
10, according to claims 3 described automatic electronic air-switchs, it is characterized in that the three-phase peak-detector circuit is kept between electric capacity (C2) anode and the inverse time lag circuit input end connects current regulating circuit, this circuit is composed in series by potentiometer (RP), resistance (R7, R8), potentiometer high potential termination is kept electric capacity (C2) anode, and centre cap connects the inverse time lag circuit input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94118377A CN1047482C (en) | 1994-11-28 | 1994-11-28 | Automatic electronic air-switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94118377A CN1047482C (en) | 1994-11-28 | 1994-11-28 | Automatic electronic air-switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1123962A CN1123962A (en) | 1996-06-05 |
| CN1047482C true CN1047482C (en) | 1999-12-15 |
Family
ID=5038802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94118377A Expired - Fee Related CN1047482C (en) | 1994-11-28 | 1994-11-28 | Automatic electronic air-switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1047482C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103401217B (en) * | 2013-08-07 | 2018-01-09 | 浙江纪元电气科技股份有限公司 | Intelligent motor protector |
| DE102020116644A1 (en) * | 2020-06-24 | 2021-12-30 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Blockage detection |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2043019U (en) * | 1988-10-31 | 1989-08-16 | 徐明显 | Protector for electric leakage |
| CN2043432U (en) * | 1988-10-05 | 1989-08-23 | 衡阳湘南电机厂 | Multifunction switch of three-phase asynchronous motor |
| CN2093470U (en) * | 1991-05-10 | 1992-01-15 | 石家庄市新星电子开关厂 | Multifunctional protection three-phase contactless electronic switch |
| CN1063385A (en) * | 1991-01-19 | 1992-08-05 | 戴开煌 | Contactless multifunctional switch |
-
1994
- 1994-11-28 CN CN94118377A patent/CN1047482C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2043432U (en) * | 1988-10-05 | 1989-08-23 | 衡阳湘南电机厂 | Multifunction switch of three-phase asynchronous motor |
| CN2043019U (en) * | 1988-10-31 | 1989-08-16 | 徐明显 | Protector for electric leakage |
| CN1063385A (en) * | 1991-01-19 | 1992-08-05 | 戴开煌 | Contactless multifunctional switch |
| CN2093470U (en) * | 1991-05-10 | 1992-01-15 | 石家庄市新星电子开关厂 | Multifunctional protection three-phase contactless electronic switch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1123962A (en) | 1996-06-05 |
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