CN201515217U - Overload relay control circuit - Google Patents
Overload relay control circuit Download PDFInfo
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- CN201515217U CN201515217U CN2009202348061U CN200920234806U CN201515217U CN 201515217 U CN201515217 U CN 201515217U CN 2009202348061 U CN2009202348061 U CN 2009202348061U CN 200920234806 U CN200920234806 U CN 200920234806U CN 201515217 U CN201515217 U CN 201515217U
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Abstract
The utility model relates to an overload relay control circuit, which consists of a current mutual inductor, a rectifying circuit, a power supply converting circuit, a signal processing circuit, a microprocessor circuit, a setting circuit and a driving circuit. The current mutual inductor is connected with the rectifying circuit which is connected with the power supply converting circuit and the signal processing circuit. The microprocessor circuit is connected with the signal processing circuit, the power supply converting circuit, the setting circuit and the driving circuit. The power supply converting circuit is connected with the signal processing circuit, the setting circuit and the driving circuit. The advantage is that because the current mutual inductor is adopted to supply power, an external control power supply is not needed, the energy is saved and the environment is protected. The microprocessor circuit has the advantages of simple circuit and low cost. The signal processing circuit is matched with the microprocessor circuit in order to realize current sampling and phase loss judgment and an extra phase loss judgment circuit is not needed, consequently the components are reduced and the cost is saved. Virtual value is adopted to calculate and the practical work state of a motor can be reflected better so that the protective property is more accurate.
Description
Technical field
The utility model relates to the control circuit of a kind of control circuit of relay, particularly overload relay.
Background technology
Electronic overload relay mainly is to be combined into the electromagnetism starting device with A.C. contactor, and the harm that be used for protecting that motor etc. is avoided transshipping, the phase failure etc. causes is the widely used electronic switch of industrial machinery or industrial equipment field.The control circuit of electronic overload relay generally all adopts application-specific integrated circuit (ASIC) and interrelated logic circuit to realize both at home and abroad at present, has shortcomings such as cost height, circuit complexity.Also there is at present the control circuit of overload relay to adopt microprocessor to add related elements realization overload and open phase protection.Realize protection owing to adopt microprocessor; therefore cost reduces greatly; but this control circuit is arranged current sample and phase failure decision circuitry branch; make the circuit relative complex; what current sample was measured in addition is mean value, and protective feature is subjected to factor affecting such as filter capacitor performance and mains by harmonics easily.
Summary of the invention
The purpose of this utility model provides a kind of energy-conserving and environment-protective, circuit is simple, cost is low and the protective feature control circuit of overload relay more accurately.
The purpose of this utility model is achieved like this, a kind of control circuit of overload relay, it is made up of current transformer, rectification circuit, power-switching circuit, signal processing circuit, microcontroller circuit, adjust circuit and drive circuit, current transformer is connected with rectification circuit, rectification circuit is connected with signal processing circuit with power-switching circuit, microcontroller circuit is connected with drive circuit with signal processing circuit, power-switching circuit, the circuit of adjusting, and power-switching circuit is connected with drive circuit with signal processing circuit, the circuit of adjusting.
Described power-switching circuit is by voltage-stabiliser tube VZ1, VZ2, diode VD1, VD2, capacitor C 4, C5, C6, C7 and pressurizer IC5 form, the positive pole of the negative pole of voltage-stabiliser tube VZ1 and diode VD1 and rectification circuit jackshaft heap IC1, IC2 is connected with the positive pole of IC3 output, the negative pole of diode VD1, the negative pole of voltage-stabiliser tube VZ2, the positive pole of capacitor C 4, after being connected, 1 pin of the positive pole of diode VD2 and pressurizer IC5 gets DC power supply+12V, the positive pole of the negative pole of diode VD2 and capacitor C 5 connects drive circuit, 3 pin of pressurizer IC5 are connected with the positive pole of an end of capacitor C 6 and capacitor C 7 and output DC source+5V, voltage-stabiliser tube VZ1, the positive pole of VZ2, capacitor C 4, C5, the negative pole of C7, the 2 pin ground connection of the other end of capacitor C 6 and pressurizer IC5.
Described signal processing circuit is by resistance R 1-R15, capacitor C 1, C2, C3, integrated circuit (IC) 4 is formed, resistance R 1, the end of R7, resistance R 2, the end of R8 and resistance R 3, the end of R9 respectively with rectification circuit in bridge heap IC1, IC2 is connected with the negative pole of IC3 output, 9 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 7 and resistance R 13,10 pin of one termination integrated circuit (IC) 4 of resistance R 10,8 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 13 and resistance R 4, one termination microcontroller circuit of the other end of resistance R 4 and capacitor C 1,6 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 8 and resistance R 14,5 pin of one termination integrated circuit (IC) 4 of resistance R 11,7 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 14 and resistance R 5, one termination microcontroller circuit of the other end of resistance R 5 and capacitor C 2,2 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 9 and resistance R 15,3 pin of one termination integrated circuit (IC) 4 of resistance R 12,1 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 15 and resistance R 6, one termination microcontroller circuit of the other end of resistance R 6 and capacitor C 3, resistance R 1, R2, the other end of R3, resistance R 10, R11, the other end of R12, capacitor C 1, C2,11 pin ground connection of the other end of C3 and integrated circuit (IC) 4,4 pin of integrated circuit (IC) 4 meet DC power supply+5V.
Described microcontroller circuit is by integrated circuit (IC) 6, resistance R 18, capacitor C 8, C9, C10 and crystal oscillator CRY form, 4 pin of one termination integrated circuit (IC) 6 of the end of crystal oscillator CRY and capacitor C 8,6 pin of one termination integrated circuit (IC) 6 of the other end of crystal oscillator CRY and capacitor C 9,3 pin of one termination integrated circuit (IC) 6 of resistance R 18, the common junction of resistance R 6 and capacitor C 3 is connected in 18 pin of integrated circuit (IC) 6 and the signal processing circuit, the common junction of resistance R 5 and capacitor C 2 is connected in 17 pin of integrated circuit (IC) 6 and the signal processing circuit, the common junction of resistance R 4 and capacitor C 1 is connected in 15 pin of integrated circuit (IC) 6 and the signal processing circuit, 12 of integrated circuit (IC) 6,14 pin are connected with the circuit of adjusting with drive circuit respectively, 16 of integrated circuit (IC) 6,7 pin, one termination DC power supply+5V of the other end of resistance R 18 and capacitor C 10, capacitor C 8, C9,5 pin ground connection of the other end of C10 and integrated circuit (IC) 6.
The described circuit of adjusting is made up of resistance R 19, capacitor C 11 and potentiometer VR1,14 pin of the integrated circuit (IC) 6 in one end of resistance R 19 and the microcontroller circuit are connected, the other end of resistance R 19 is connected with an end of capacitor C 11 and the adjustable side of potentiometer VR1, termination DC power supply+the 5V of potentiometer VR1, the other end ground connection of the other end of potentiometer VR1 and capacitor C 11.
Described drive circuit is made up of diode D1, triode Q1 and resistance R 16, R17, the negative pole of diode D1 is connected with negative pole and the common junction of the capacitor C 5 and end of trip coil J1 of diode VD2 in the power-switching circuit, the positive pole of diode D1 is connected with the collector electrode of the other end of buckleing device coil J1 and triode Q1, the base stage of triode Q1 is connected with the end of resistance R 16, R17,12 pin of the integrated circuit (IC) 6 in another termination microcontroller circuit of resistance R 16, the other end ground connection of the emitter of triode Q1 and resistance R 17.
The utility model need not external control power supply, energy-conserving and environment-protective owing to adopt current transformer power supply.Adopt microcontroller circuit, circuit is simple, and cost is low; Signal processing circuit and microcontroller circuit cooperate realizes current sample and phase failure judgement, need not extra phase failure decision circuitry, thereby reduces components and parts, saves cost; The employing effective value calculates, and can better reflect the practical working situation of motor, makes protective feature more accurate.
Description of drawings
Fig. 1 is a theory diagram of the present utility model.
Fig. 2 is an electrical schematic diagram of the present utility model.
Embodiment
Consult Fig. 1, a kind of control circuit of overload relay is made up of current transformer, rectification circuit, power-switching circuit, signal processing circuit, microcontroller circuit, adjust circuit and drive circuit.The secondary winding of described current transformer is connected with rectification circuit.One the tunnel exports power-switching circuit to after the described rectification circuit rectification, and another road exports signal processing circuit to.Described signal processing circuit exports microcontroller circuit to after current signal is handled.Described microcontroller circuit exports drive circuit to after current signal is handled, and the described circuit of adjusting is connected with microcontroller circuit and carries out information setting.Power-switching circuit provides DC power supply for signal processing circuit, microcontroller circuit, adjust circuit and drive circuit.
Consult Fig. 2, current transformer is made up of three current transformer CT1, CT2 and CT3, and rectification circuit is made up of three bridge heap IC1, IC2 and IC3.The former limit winding of current transformer CT1, CT2 and CT3 connects motor circuit, the secondary winding of current transformer CT1, CT2 and CT3 is respectively after bridge heap IC1, IC2 and IC3 full-wave rectification, the anode output of bridge heap IC1, IC2 and IC3 through voltage-stabiliser tube VZ1 clamper, diode VD1 isolate, after VZ2 clamper and capacitor C 4 filtering DC power supply+12V, the one tunnel again after pressurizer IC5 linear voltage stabilization and capacitor C 6, C7 filtering output DC source+5V be other circuit supply; Another road through diode VD2 isolate, capacitor C 5 energy storage are as the power supply of trip coil J1.The three-phase current signal sampling that the negative terminal output of bridge heap IC1, IC2 and IC3 is formed through resistance R 1, R2 and R3, again after the dc amplification circuit of resistance R 7-R12 and integrated circuit (IC) 4 compositions amplifies, after the filter circuit that resistance R 4, R5, R6 and capacitor C 1, C2, C3 form carries out filtering, deliver to microcontroller circuit and carry out the A/D conversion again.Microcontroller circuit carries out judging the situation of each phase current again according to the set information of the circuit of adjusting after effective value calculates to three-phase current signal, thereby determines overload and/or phase failure situation, calculates and drives trip coil J1 action by drive circuit operate time.Pressurizer IC5 is L7805, and integrated circuit (IC) 4 is LM224, and integrated circuit (IC) 6 is R8C1B.
Claims (6)
1. the control circuit of an overload relay, it is characterized in that it is made up of current transformer, rectification circuit, power-switching circuit, signal processing circuit, microcontroller circuit, adjust circuit and drive circuit, current transformer is connected with rectification circuit, rectification circuit is connected with signal processing circuit with power-switching circuit, microcontroller circuit is connected with drive circuit with signal processing circuit, power-switching circuit, the circuit of adjusting, and power-switching circuit is connected with drive circuit with signal processing circuit, the circuit of adjusting.
2. the control circuit of a kind of overload relay according to claim 1, it is characterized in that described power-switching circuit is by voltage-stabiliser tube VZ1, VZ2, diode VD1, VD2, capacitor C 4, C5, C6, C7 and pressurizer IC5 form, the positive pole of the negative pole of voltage-stabiliser tube VZ1 and diode VD1 and rectification circuit jackshaft heap IC1, IC2 is connected with the positive pole of IC3 output, the negative pole of diode VD1, the negative pole of voltage-stabiliser tube VZ2, the positive pole of capacitor C 4, the 1 pin connector of the positive pole of diode VD2 and pressurizer IC5 gets DC power supply+12V, the positive pole of the negative pole of diode VD2 and capacitor C 5 connects drive circuit, 3 pin of pressurizer IC5 are connected with the positive pole of an end of capacitor C 6 and capacitor C 7 and output DC source+5V, voltage-stabiliser tube VZ1, the positive pole of VZ2, capacitor C 4, C5, the negative pole of C7, the 2 pin ground connection of the other end of capacitor C 6 and pressurizer IC5.
3. the control circuit of a kind of overload relay according to claim 1, it is characterized in that described signal processing circuit is by resistance R 1-R15, capacitor C 1, C2, C3, integrated circuit (IC) 4 is formed, resistance R 1, the end of R7, resistance R 2, the end of R8 and resistance R 3, the end of R9 respectively with rectification circuit in bridge heap IC1, IC2 is connected with the negative pole of IC3 output, 9 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 7 and resistance R 13,10 pin of one termination integrated circuit (IC) 4 of resistance R 10,8 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 13 and resistance R 4, one termination microcontroller circuit of the other end of resistance R 4 and capacitor C 1,6 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 8 and resistance R 14,5 pin of one termination integrated circuit (IC) 4 of resistance R 11,7 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 14 and resistance R 5, one termination microcontroller circuit of the other end of resistance R 5 and capacitor C 2,2 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 9 and resistance R 15,3 pin of one termination integrated circuit (IC) 4 of resistance R 12,1 pin of one termination integrated circuit (IC) 4 of the other end of resistance R 15 and resistance R 6, one termination microcontroller circuit of the other end of resistance R 6 and capacitor C 3, resistance R 1, R2, the other end of R3, resistance R 10, R11, the other end of R12, capacitor C 1, C2,11 pin ground connection of the other end of C3 and integrated circuit (IC) 4,4 pin of integrated circuit (IC) 4 meet DC power supply+5V.
4. the control circuit of a kind of overload relay according to claim 1, it is characterized in that described microcontroller circuit is by integrated circuit (IC) 6, resistance R 18, capacitor C 8, C9, C10 and crystal oscillator CRY form, 4 pin of one termination integrated circuit (IC) 6 of the end of crystal oscillator CRY and capacitor C 8,6 pin of one termination integrated circuit (IC) 6 of the other end of crystal oscillator CRY and capacitor C 9,3 pin of one termination integrated circuit (IC) 6 of resistance R 18, the common junction of resistance R 6 and capacitor C 3 is connected in 18 pin of integrated circuit (IC) 6 and the signal processing circuit, the common junction of resistance R 5 and capacitor C 2 is connected in 17 pin of integrated circuit (IC) 6 and the signal processing circuit, the common junction of resistance R 4 and capacitor C 1 is connected in 15 pin of integrated circuit (IC) 6 and the signal processing circuit, 12 of integrated circuit (IC) 6,14 pin are connected with the circuit of adjusting with drive circuit respectively, 16 of integrated circuit (IC) 6,7 pin, one termination DC power supply+5V of the other end of resistance R 18 and capacitor C 10, capacitor C 8, C9,5 pin ground connection of the other end of C10 and integrated circuit (IC) 6.
5. the control circuit of a kind of overload relay according to claim 1, it is characterized in that the described circuit of adjusting is made up of resistance R 19, capacitor C 11 and potentiometer VR1,14 pin of the integrated circuit (IC) 6 in one end of resistance R 19 and the microcontroller circuit are connected, the other end of resistance R 19 is connected with an end of capacitor C 11 and the adjustable side of potentiometer VR1, termination DC power supply+the 5V of potentiometer VR1, the other end ground connection of the other end of potentiometer VR1 and capacitor C 11.
6. the control circuit of a kind of overload relay according to claim 1, it is characterized in that described drive circuit is by diode D1, triode Q1 and resistance R 16, R17 forms, the negative pole of diode D1 is connected with negative pole and the common junction of the capacitor C 5 and end of trip coil J1 of diode VD2 in the power-switching circuit, the positive pole of diode D1 is connected with the collector electrode of the other end of buckleing device coil J1 and triode Q1, the base stage of triode Q1 and resistance R 16, the end of R17 connects, 12 pin of the integrated circuit (IC) 6 in another termination microcontroller circuit of resistance R 16 connect, the other end ground connection of the emitter of triode Q1 and resistance R 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202348061U CN201515217U (en) | 2009-08-07 | 2009-08-07 | Overload relay control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202348061U CN201515217U (en) | 2009-08-07 | 2009-08-07 | Overload relay control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201515217U true CN201515217U (en) | 2010-06-23 |
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ID=42486629
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202348061U Expired - Lifetime CN201515217U (en) | 2009-08-07 | 2009-08-07 | Overload relay control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201515217U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236679A (en) * | 2013-05-16 | 2013-08-07 | 天津市百利电气有限公司 | Electronic type backup protection device for AC (alternating current) circuit breaker |
| CN103248002A (en) * | 2013-05-16 | 2013-08-14 | 天津市百利电气有限公司 | Electronic-type overload relay with reliable phase-failure protection function |
-
2009
- 2009-08-07 CN CN2009202348061U patent/CN201515217U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103236679A (en) * | 2013-05-16 | 2013-08-07 | 天津市百利电气有限公司 | Electronic type backup protection device for AC (alternating current) circuit breaker |
| CN103248002A (en) * | 2013-05-16 | 2013-08-14 | 天津市百利电气有限公司 | Electronic-type overload relay with reliable phase-failure protection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100623 |
|
| CX01 | Expiry of patent term |