CN2059776U - Single power supply integration protector for motor - Google Patents
Single power supply integration protector for motor Download PDFInfo
- Publication number
- CN2059776U CN2059776U CN 89216690 CN89216690U CN2059776U CN 2059776 U CN2059776 U CN 2059776U CN 89216690 CN89216690 CN 89216690 CN 89216690 U CN89216690 U CN 89216690U CN 2059776 U CN2059776 U CN 2059776U
- Authority
- CN
- China
- Prior art keywords
- circuit
- control circuit
- protector
- output
- overcurrent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Abstract
The utility model relates to a single power supply integration protector for a motor, which is composed of a signal detecting circuit 1, a phase interruption control circuit 2, a short circuit control circuit 8, an over current control circuit 3, an over voltage control circuit 7, an electric leakage control circuit 9, an over current display circuit 4, a protector output circuit 5 and a power circuit 6. When the over voltage, over current, short circuit, phase interruption and electrical leakage occur, the signal detecting circuit and corresponding circuits take out the signal and realize the protection through a protector output circuit. The protector is also provided with display for the over current of running. The utility model has the advantages of simple structure, low cost, high reliability, multiple functions and favorable performance.
Description
The utility model relates to a kind of integrated motor protector of single supply, is applicable in the alternating current motor and various circuit that exchanges 50 hertz of voltage to 660 volts, makes overload, the phase failure, overvoltage, short-circuit protection and motor housing earth leakage protective.
The protection that motor is in operation; the protective device protection of being made up of thermal relay protection, transistor discrete component develops into integrated motor protector protection, is developed into multifunction protections such as overload, the phase failure, three-phase imbalance by single overcurrent protection.Mostly the integrated motor protector that relates in the multiple technologies document is to adopt duplicate supply (being positive and negative power supply) power supply, makes the circuit structure complexity, and the cost height is applied and had any problem.According to a kind of " electronic type electric motor protective equipment " that China's " electrical apparatus technology " 1986 3 phases announce, it has overload, the phase failure, several functions of negative-phase sequence.The circuit block diagram (see figure 1) of this device comprises following circuit: signal deteching circuit, phase failure control circuit, overcurrent control circuit, circuit of testing the phase sequence, protector output circuit and power circuit.
The said apparatus circuit though overload, the phase failure, anti-phase several defencive functions are arranged, generally can be realized the protection to motor, but still have following problem.1. for open-phase protection circuit, it is made up of current transformer, fast current circuit, filter, voltage divider, the signal that detects by foregoing circuit, the first comparator that passes through or add to voltage in the protector output circuit behind the door, make the phase failure (and three-phase equilibrium) circuit detecting signal reduce, sensitivity reduces; 2. for the overcurrent protection link, its difference integrator output is through voltage comparator, again through or door add to back step voltage comparator and remove the driving power amplifier, line construction influences its right side and leans on property with regard to more complicated; 3. this circuit is that conceive on the basis with fixing input number of ampere turns, when running into the less current occasion in use, increase the number of turn of the elementary winding of instrument transformer, run into bigger electric current as occasion greater than specified number of ampere turns (7 ampere-turn), external impressed current instrument transformer again, the electric current of input protector is changed to the input range that is allowed, and this just brings greater inconvenience to the user, and equipment cost is risen; 4. owing to adopt the core circuit of difference integrator as overcurrent protection, sort circuit needs positive-negative power supply.
Task of the present utility model be design a kind of multiple functional, circuit is fairly simple and the single supply motor protector that has fault to show, adapts to the protection requirement of various motor under the various working condition.
Task of the present utility model is finished like this.(with reference to Fig. 2):
1). on the general structure of electric wiring, set up control circuits such as overvoltage, short circuit, electric leakage, increased its defencive function.And the improvement part circuit design, make several protection links such as the phase failure (and three-phase imbalance), overcurrent, short circuit, all earlier through over-voltage comparator, again through or the direct driving amplifier work of door output, designs simplification like this, the circuit flow process is clear.
2). the detection signal of three phases of the phase failure (and three-phase imbalance) directly is added to respectively on three voltage comparators, can improves sensitivity.
3). in order to simplify circuit, adopt single power supply, designed the forward input difference comparator of counter-rotating, output difference ratio amplifying signal, external integration time delay process connects voltage comparator again.
4). in order to adapt to number of ampere turns in a big way, can use at minimum number of ampere turns to the electric current in the range of capacity, and need only be 1 circle the instrument transformer secondary winding number of turn.
5). this line design fault display circuit, wherein the overcurrent shows signal is taken from difference comparison amplifier output, directly adds to voltage comparator, when no current, the difference comparison amplifier is output as zero, this moment, normal running indicator was bright, over current lamp does not work; When overcurrent occurring, its output is greater than zero, and sensitive voltage comparator is exported merchant's level immediately, and normal running indicator is extinguished, and over current lamp is lighted.Monitor the protector working condition under the overcurrent condition thus more conveniently.
Protector through redesign has not only increased function and has satisfied customer requirements, and simplified circuit, has improved reliability, and its manufacturing cost also decreases, and makes motor protector use on multiple motor and becomes possibility.
Formation of the present utility model and embodiment and the course of work provide (circuit block diagram of list of references is also enclosed) by the following drawings:
Fig. 1 is prior art " electronic type motor protector control device circuit " block diagram.
Fig. 2 is a circuit block diagram of the present utility model.
Fig. 3 is an electric circuit diagram of the present utility model.
With reference to Fig. 2; circuit of the present utility model is made of following circuit: 1 is signal deteching circuit; 2 are phase failure control circuit; 3 is the overcurrent control circuit, and 4 are operation, overcurrent control circuit, and 5 is the protector output circuit; 6 is power circuit; 7 is the overvoltage control circuit, and 8 is short-circuit control circuit, and 9 is leakage control circuit.What the utility model adopted is the power supply of single supply positive voltage, and the voltage of electric primary circuit (6) is positive voltage output.Foregoing circuit connect the relation of joining, be described in detail below.
With reference to Fig. 3, by current transformer DH
1, DH
2, DH
3And resistance R
* 1, R
* 2, R
* 3, diode D
1～D
9, capacitor C
1～C
4Form signal detection circuit (1); By resistance R
4～R
15, diode D
10～D
15, capacitor C
5～C
7With integrated operational amplifier IC
1/1～IC
1/3, integrated positive or gate IC
3/1Form the phase failure (and three-phase imbalance) control circuit (2); By resistance R
25～R
36, potentiometer W
2～W
5, diode D
24, capacitor C
10, C
11With integrated operational amplifier IC
2/2, IC
2/3Form overcurrent control circuit (3); By resistance R
25～R
27, R
18～R
20, potentiometer W
1, W
2With integrated operational amplifier IC
2/1Form short-circuit control circuit (8); By resistance R
42～R
46, potentiometer W
6, capacitor C
12With integrated operational amplifier IC
2/4Form overvoltage control circuit (7); By resistance R
～R
51, diode D
27～D
31, capacitor C
13Form leakage control circuit (9); By resistance R
37～R
41, integrated operational amplifier IC
1/4, diode D
25, D
26, triode T
3Form operation, overcurrent display circuit (4); By transformer B
1, diode D
19～D
23, capacitor C
9, resistance R
0, R
24Form voltage-stabilized power supply circuit (6); By integrated formal door IC
3/2, resistance R
23, capacitor
, triode T
2, diode D
17Form the driving executive circuit with relay J.
Foregoing circuit connect the relation of joining: the input of overvoltage control circuit (7), pass through resistance R
26, potentiometer W
2, D
18Join with signal deteching circuit (1), its output links to each other with protector circuit (5); The input of short-circuit control circuit (8) passes through D
18Join with signal deteching circuit (1), its output links to each other with protector output circuit (5); Its input of leakage control circuit (9) passes through diode
Join with motor casing, its output links to each other with protector (5); The input and the signal deteching circuit of overcurrent control circuit (3) join, and its output links to each other with protector output circuit (5), also is connected with the overcurrent display circuit; Operation overcurrent display circuit (4) also is connected with phase failure control circuit (2) except joining with overcurrent control circuit (3).
Need explanation in addition,, be under the situation of normal operation resistance R at protected motor for the phase failure (and three-phase imbalance) control circuit
4～R
9Resistance design to such an extent that the partial pressure value in the middle of making be-0.05～-0.1 volt, the assurance voltage comparator ic
1/1～IC
1/3Be output as " zero "; When the phase failure (or three-phase imbalance) took place, the value of corresponding dividing point became greater than 0 volt, voltage comparator output high level, warp or door IC
2/1The output high level drives " phase failure " display lamp on the one hand; Promote to drive executive circuit on the other hand and make the actuating of relay.
For overcurrent control circuit (3), under normal circumstances, input signal is less than or equal to by potentiometer W
3The reference voltage of adjusting, the difference comparator is output as " zero "; If input signal is greater than reference voltage, the output V=K(V λ of difference comparator-V joins), this voltage is through R
33, W
4Go into C
11The delay circuit of forming is to C
11Charging, behind the delay time through regulation, C
11On voltage reach by W
5The reference voltage of the voltage comparator of adjusting, voltage comparator ic
2/3Output switching activity is a high level, warp or door IC
3/2Output makes and drives the executive circuit actuating of relay.The supply power voltage of this control circuit (3) is controlled at+and 10 volts.
When normal operation, IC
2/2Be output as " zero ", voltage comparator ic
1/4Output also is " zero ", normal operation this moment light-emitting diode D
25Shinny; When overcurrent occurs, IC
2/2Output is greater than " zero ", voltage comparator ic
1/4Output switching activity is a high level, normal running indicator D
25Extinguish, and overcurrent fault indication light-emitting diode D
26Shinny.For ease of implementing, enclose Component List.
Component List
DH
1～DH
3: magnet ring R
50: 4.3K
IC
1、IC
2：LM324 R
51：510Ω
IC
3：CD4072 R
16：10K
T
1～T
3：3DG201 R
17：15Ω
D
1～D
9：IN4004 R
18、19：100K
D
10～D
15：2AP9 R
20：100Ω
D
16: light-emitting diode R
21: 4.7K
D
17：IN4004 R
22：9.1K
D
18：IN4001 R
23：9.1K
D
19～D
22：IN4004 R
24：390Ω
D
23：2CW60 R
25：51K
D
24：2CW58 R
26：100Ω
D
25: light-emitting diode R
27: adjust and use
D
26: light-emitting diode R
26～R
30: 100K
D
27～D
29：IN4007 R
31：1MΩ
D
30: light-emitting diode R
32: 100 Ω
D
31：2CW58 R
33：470K
C
1～C
4：CD
11－22μf／50v R
34～R
35：100K
C
5～C
7：CD
11－10μf／16v R
36：100Ω
C
8：CD
11－2.2μf／16v R
37、R
38：100K
C
9：CD
11－100μf／50v R
39：4.7K
C
10：CD
11－2.2μf／16v R
40：9.1K
C
11：CD
11－100μf／16v R
41：4.7K
C
12：CD
11－10μf／16v R
42：20K
C
13：CD
11－47μf／16v R
43：10K
R
0～R
3: adjust and use R
44, R
45: 100K
R
4、R
6、R
8：68K R
46：100Ω
R
5、R
7、R
9：33K R
48：10K
R
10－R
15：100K R
49：5.6K
Claims (3)
1, the integrated motor protector of a kind of single supply; form by signal deteching circuit (1), phase failure control circuit (2), overcurrent control circuit (3), protector output circuit (5) and anti-phase testing circuit and power circuit (6); it is characterized in that it has deducted anti-phase testing circuit; following several circuit have been set up, promptly by resistance R
42～R
46, potentiometer W
6, capacitor C
12, integrated operational amplifier IC
2/4The overvoltage control circuit of forming (7), by resistance R
25～R
27, R
18～R
20, potentiometer W
1, W
2With integrated operational amplifier IC
2/1The short-circuit control circuit of forming (8) is by resistance R
48～R
51, diode D
27～D
31, capacitor C
13The leakage control circuit of forming (9), by resistance R
37～R
41, integrated operational amplifier IC
1/4, light-emitting diode D
25, D
26, triode T
3Operation, the overcurrent display circuit (4) formed, the connecing to join to close and be of foregoing circuit:
The input of overvoltage control circuit (7) passes through R
26, W
2, D
14Join with signal deteching circuit (1), its output links to each other with protector output circuit (5); The input of short-circuit control circuit (8) passes through D
14Join with signal deteching circuit (1), output links to each other with protector output circuit (5); The input of leakage control circuit (9) passes through D
24Join with motor casing, output links to each other with protector output circuit (5); Operation, the input of overcurrent display circuit (4) and the IC of overcurrent control circuit (3)
2/2Join, protector adopts the power supply of single supply positive voltage.
2, motor protector according to claim 1 is characterized in that the supply power voltage of overcurrent control circuit (3) is controlled at+10 volts.
3, motor protector according to claim 1 is characterized in that the current transformer secondary winding number of turn in the signal deteching circuit (1) is 1 circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89216690 CN2059776U (en) | 1989-09-16 | 1989-09-16 | Single power supply integration protector for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89216690 CN2059776U (en) | 1989-09-16 | 1989-09-16 | Single power supply integration protector for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2059776U true CN2059776U (en) | 1990-07-25 |
Family
ID=4872096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89216690 Withdrawn CN2059776U (en) | 1989-09-16 | 1989-09-16 | Single power supply integration protector for motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2059776U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877475A (en) * | 2010-06-28 | 2010-11-03 | 广州视景显示技术研发有限公司 | Power supply short-circuit protection circuit |
-
1989
- 1989-09-16 CN CN 89216690 patent/CN2059776U/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877475A (en) * | 2010-06-28 | 2010-11-03 | 广州视景显示技术研发有限公司 | Power supply short-circuit protection circuit |
| CN101877475B (en) * | 2010-06-28 | 2012-11-21 | 广州视景显示技术研发有限公司 | Power supply short-circuit protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1080476C (en) | Overcurrent protection circuit | |
| CN1038551A (en) | The solid-state trip apparatus that comprises instantaneous trip circuit and independent of power voltage | |
| CN1108655C (en) | Charge and discharge control circuit | |
| JPH05501043A (en) | Loss of neutral or ground protection circuit | |
| US5635772A (en) | Method and apparatus for transferring between electrical power sources which adaptively blocks transfer until load voltage decays to safe value | |
| JPS6022489A (en) | Overload preventing method in motor controller | |
| US5488303A (en) | GFCI with auxiliary coil current blocking means and improved test button configuration | |
| CN1217465C (en) | Circuit breaker | |
| CN2059776U (en) | Single power supply integration protector for motor | |
| JPH0888941A (en) | Determining device of quality of storage battery for uninterruptible power supply unit | |
| JPH03207224A (en) | Geomagnetic induction current compensator | |
| JPH03128618A (en) | Direct current semiconductor breaker | |
| JPH08140257A (en) | Protective device for dc capacitor | |
| JP2806162B2 (en) | Switch | |
| GB2229053A (en) | Protection against arcing in cables | |
| CN1155973C (en) | Power distribution network incorporating a voltage support transformer and process of use | |
| CN1127745C (en) | Breaking device | |
| CN1025581C (en) | Inverse time-lay overcurrent relay | |
| CN2041456U (en) | Protector for electric appliances | |
| KR940020648A (en) | Digital relay method for load ground protection of electronic switchgear | |
| JP2721285B2 (en) | Control device of AC / DC converter | |
| SU1198642A1 (en) | Device for internal damage protection of capacitor bank with isolated neutral | |
| CN2171942Y (en) | Loss of phase overload protector for multi-capacity electrical machinery | |
| JP2579811B2 (en) | Vehicle generator with overvoltage protection device | |
| CN2229723Y (en) | Phase loss and phase-sequence protection relay |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |