CN2402041Y - Electronic protector for motor - Google Patents
Electronic protector for motor Download PDFInfo
- Publication number
- CN2402041Y CN2402041Y CN 99251177 CN99251177U CN2402041Y CN 2402041 Y CN2402041 Y CN 2402041Y CN 99251177 CN99251177 CN 99251177 CN 99251177 U CN99251177 U CN 99251177U CN 2402041 Y CN2402041 Y CN 2402041Y
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- circuit
- operational amplifier
- diode
- phase
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- Expired - Fee Related
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- Control Of Electric Motors In General (AREA)
Abstract
The utility model is composed of a housing, a printed circuit board, a power circuit, a three-phase current converting circuit, a starting signal processing delay circuit, an over-current signal amplifying circuit, an over-current delay circuit, an over-current signal locking circuit, an interruption phase detecting signal amplifying circuit, an interruption phase delay circuit, a signal leakage generating circuit, an integrated amplifying circuit, an executive circuit, etc. The utility model can carry out reliable power-off protection to faults such as the over-current, the overload, the short circuit, the dielectric penetration, the phase interruption, the phase unbalance, the over-temperature, the leakage, etc. The utility model has the advantages of simple structure, low cost, safety, etc.
Description
The utility model relates to a kind of electronic motor protector, especially the electronic motor protector of being made up of shell, printed circuit board (PCB) etc.
At present, the electronic motor protector of selling on the market mainly exists power volume big, and function singleness can't be carried out monophase machine, and the protection of three phase electric machine is selected; After breaking down, can't show malfunction, perhaps carry out manually that selection automatically resets; Simultaneously owing to use discrete component or a plurality of chip to cause reliability low, the shortcoming that cost is high.
Commercially available motor protecter also exists can't the on-line testing protector, can't adapt to the shortcoming of various conditions startings (soft, hard).
The utility model purpose is to provide a kind of power supply reliability height, and cost is low, and volume is little, has manual, the selection that automatically resets, and can pin malfunction, can be used for the electronic motor protector that monophase machine also can be used for three phase electric machine.
Order of the present utility model ground is to realize like this; the electronic motor protector is handled delay circuit, overcurrent signal amplifying circuit, overcurrent delay circuit by shell, printed circuit board (PCB), power circuit, three-phase current change-over circuit, initiating signal, and overcurrent signal lock-in circuit, default phase signal detect amplifying circuit, phase shortage delay circuit, electric leakage signal generation circuit, comprehensively amplifying circuit, executive circuit constitute.Described power circuit is made up of capacitor, the resistance that is attempted by the capacitor two ends and rectifier bridge; Initiating signal is handled delay circuit by an operational amplifier, diode and the resistance input of signal by being connected on its input, the variable resistor and the diode of the parallel connection by being connected on its output output to a voltage-stabiliser tube negative pole, and this voltage-stabiliser tube positive pole is connected with triode and forms; The overcurrent delay circuit is by the variable resistor and the diode of the parallel connection that is connected operational amplifier output terminal, and the variable resistor and the diode other end are connected with capacitor and form; The phase shortage delay circuit is by parallel resistor that is connected operational amplifier output terminal and diode, and the resistance and the diode other end are connected with capacitor and form; Comprehensive amplifying circuit is by the resistance that is connected the operational amplifier input, controllable silicon, and diode is formed.
Because power circuit has adopted resistance-capacitance depressurization, so reduced volume; So, improved reliability because IC of employing finishes comparison and enlarging function has reduced cost; Owing to be provided with manual, the selection that automatically resets in the circuit, made things convenient for operator's use.The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is an electronic motor protector electrical principle block diagram, and Fig. 2 is an electronic motor protector electrical schematic diagram.
Fig. 1 shows the utility model electrical principle block diagram; as can be seen from Figure; the electronic motor protector is handled delay circuit 3, overcurrent signal amplifying circuit 4, overcurrent delay circuit 5 by shell, printed circuit board (PCB), power circuit 1, three-phase current change-over circuit 2, initiating signal; overcurrent signal lock-in circuit 6, default phase signal detect amplifying circuit 7, phase shortage delay circuit 8, electric leakage signal generation circuit 10, comprehensive amplifying circuit 12, executive circuit 13, constitute, and it is characterized in that:
Described power circuit (1) is made up of capacitor, the resistance that is attempted by the capacitor two ends and rectifier bridge;
Initiating signal is handled delay circuit 3 by an operational amplifier 17, diode and the resistance input of signal by being connected on its input, the variable resistor and the diode of the parallel connection by being connected on its output output to a voltage-stabiliser tube negative pole, and this voltage-stabiliser tube positive pole is connected with triode and forms;
Phase shortage delay circuit 8 is by the parallel resistor and the diode that are connected operational amplifier 19 outputs, and the resistance and the diode other end are connected with capacitor and form;
Be connected with the phase shortage lock-in circuit of forming by switch, resistance and the diode of series connection 9 at operational amplifier 19 inputs, output.
Be connected to the heat alarm generation circuit 11 of switch, thermistor, potentiometer and the controllable silicon composition of series connection at operational amplifier 20 inputs.
Comprehensive amplifying circuit 12 is by the resistance that is connected operational amplifier 20 inputs, controllable silicon, and diode is formed.
Be connected with the self-checking circuit of forming by the on-line testing button 14 at three-phase current change-over circuit 2 outputs.
Be connected to the manual reset circuit 15 that a switch is formed at operational amplifier 20,19 outputs.
Be connected with the failure indicating circuit of forming by the switch and the light-emitting diode of series connection 16 at operational amplifier 20,19 outputs:
By Fig. 1, Fig. 2 as seen, the utility model power circuit 1 by capacitor C1, is attempted by the resistance R 4 at capacitor two ends, and rectifier bridge D23-26; And resistance R 5 is formed.Do not adopt traditional transformer conversion regime, thereby reduced volume.Relatively be enlarged into 4 the identical operation amplifiers 17,18,19,20 that are encapsulated in the same integrated package and constitute, adopt general high precision operating amplifier LM324 in the present embodiment.
Transducer CT1, CT2, CT3, form CT sensor circuit 1 with diode D1-D12, diode D13-D18 forms three-phase current change-over circuit 2, initiating signal is handled delay circuit 3 by switching diode D21, D32, resistance R 12, R13, R14, R20, R25, operational amplifier 17, variable resistor W3, capacitor C7: voltage-stabiliser tube VD37, elements such as triode VT2, VT3 are formed.When CT has signal output, through D13, D14, D15 switching diode rectification input operational amplifier 17 comparison amplifier in-phase input ends.R13 and R20 resistance constitute the comparator reference voltage.When the in-phase end signal is higher than end of oppisite phase, operational amplifier 17 output high potentials, variable resistor 20, capacitor C 7, voltage stabilizing didoe VD37 form the charging delay circuit, when the voltage time-delay reaches VT2 transistor base conducting voltage, VT2 conducting work.The VT2 conducting makes the VT3 base stage lose voltage, and VT3 quits work (closing), realizes the big current processing delay function of electric motor starting.
Overcurrent signal amplifying circuit 4 constitutes the fiducial value that can change overcurrent protection by variable resistor W1 and resistance R 7, R8, R9, R10, operational amplifier 18.
Overcurrent signal lock-in circuit 6 is made up of after electric motor starting is finished elements such as K switch 1, resistance R 30, diode D30, R22 and LED39, SB2 trigger switches, and VT3 quits work, and operational amplifier 18 overcurrent comparison amplifier in-phase input ends are set up voltage.Resistance R 7, R8, R9, R10 variable resistor 18 are formed reference potential and are adjusted circuit, input operational amplifier 18 end of oppisite phase reference voltages, when the in-phase input end signal is higher than benchmark electricity operational amplifier 18 output high potentials, enter the overcurrent alarm condition, make red LED luminous.And through variable resistor W4 capacitor C8 is charged, realize the fault time-delay, when charging voltage is higher than when setting reference voltage, operational amplifier 20 output high potentials make the VT1 conducting, and relay J is started working, and realizes overcurrent protection function.Be in when often opening as K1, circuit is not closed, and relay J automatically reset after several seconds.K1 is set normally off, when the main circuit outage, during the output of CT no signal, operational amplifier 18 closings of circuit, feedback signal keeps, operational amplifier 18 output high potentials.Relay J does not automatically reset, and the overcurrent indication keeps bright attitude, realizes that fault keeps function.Press trigger switch SB2 operational amplifier 19 output high potential ground connection, make operational amplifier 20 in-phase input ends lose voltage, realize the hand-reset function.
Variable resistor W3 and capacitor C7, voltage stabilizing didoe D37 form the charging delay circuit, change the value of variable resistor W3, can change.The big current time of electric motor starting is to adapt to the different starting situations (soft, hard start) of motor.
Default phase signal detects amplifying circuit 7 by diode DI3-D18, and elements such as D22, D34, D35, resistance R 17, R18, R19, R11, R16, R1, R2, R3, R23, operational amplifier 19 are formed.
Phase shortage delay circuit 8 is by parallel resistor R23 that is connected operational amplifier 19 outputs and diode D34, and the resistance R 23 and the diode D34 other end are connected with capacitor C9 and form;
Be connected with the phase shortage lock-in circuit of forming by the K switch 2, resistance R 31 and the diode D31 that connect 9 at operational amplifier 19 inputs, output
Utilize the unidirectional on state characteristic of diode, make automatic switching circuit.Operational amplifier 19 in-phase input end voltages are lower than inverting input voltage when CT three-phase signal balance, the output of operational amplifier 19 no signals.When CT has one arbitrarily mutually or two-phase, no signal output or uneven between phase and phase＞60% o'clock, D16, D17, three switching diodes of D1 just have one or two conductings.After the switching diode conducting, operational amplifier 19 makes end of oppisite phase voltage be lower than in-phase input end with end of oppisite phase balance resistance R17 and CT signal attenuation resistance R 1 or R2, R3 realization dividing potential drop.During operational amplifier 19 output high potentials, phase shortage warning light-emitting diode 38 is bright.And through resistance R 23, capacitor C9 composition charging delay circuit.As the very fast recovery of circuit, can return operate as normal, rise to when being higher than operational amplifier 20 end of oppisite phase reference voltages as charging voltage; operational amplifier 20 has signal output; make the VT1 conducting, relay J work realizes phase shortage, unbalance protection function between phase and phase.
Electric leakage signal generation circuit 10, circuit is made up of elements such as resistance R 30, R31, R32, capacitor CIO, diode D42, D43, D44, D45, D46.
As zero line N; when ground wire E (connecing the electrical appliance shell) has electric current and voltage to produce; through the electric resistance partial pressure diode rectification; input operational amplifier 20 in-phase input ends; when surpassing the safe voltage electric current as electric leakage, operational amplifier 20 in-phase input end voltages are higher than inverting input, operational amplifier 20 output high potentials; make VTI turn-on relay J action, realize creepage protection function.
Be connected to the heat alarm generation circuit 11 of K switch 3, thermistor R34, potentiometer W5 and the controllable silicon VS1 composition of series connection at operational amplifier 20 inputs.
When using the heat protection, the K3 closure.Circuit utilizes the characteristic of thermistor with the temperature change resistance, works as temperature change, and the thermistor resistance changes, and reaches voltage and changes.Temperature superelevation resistance changes, and makes VS1 reach conducting voltage, and VSI conducting operational amplifier 20 in-phase input end voltages are higher than oppositely auspicious, and operational amplifier 20 has signal output, makes the VT1 conducting, and the relay J action realizes the overtemperature prote function.
Comprehensive amplifying circuit 12 is made of jointly operational amplifier 17,18,19,20.
Be connected with the self-checking circuit of forming by on-line testing button SB1 14 at three-phase current change-over circuit 2 outputs.
Press on-line testing button SB1, high potential makes its output high potential through D19 input operational amplifier 17,18,19.
Be connected to the manual reset circuit 15 that a switch S B2 forms at operational amplifier 20,19 outputs.
Press switch S B2, make operational amplifier 20 ground connection, lose voltage, make its no signal output.
Be connected with the failure indicating circuit of forming by the resistance R 21, R22 and light-emitting diode D38, the D39 that connect 16 at operational amplifier 20,19 outputs.
When operational amplifier 18,19 output high potentials, make it shinny through resistance R 21, R22 input light-emitting diode D38, D39.Realize fault indication function.
Claims (6)
1. electronic motor protector; handle delay circuit (3), overcurrent signal amplifying circuit (4), overcurrent delay circuit (5) by shell, printed circuit board (PCB), power circuit (1), three-phase current change-over circuit (2) initiating signal; overcurrent signal lock-in circuit (6) default phase signal detects amplifying circuit (7), phase shortage delay circuit (8), electric leakage signal generation circuit (10), comprehensive amplifying circuit (12), executive circuit (13), constitutes, and it is characterized in that:
Described power circuit (1) is made up of capacitor, the resistance that is attempted by the capacitor two ends and rectifier bridge;
Initiating signal is handled delay circuit (3) by an operational amplifier (17), diode and the resistance input of signal by being connected on its input, the variable resistor and the diode of the parallel connection by being connected on its output output to a voltage-stabiliser tube negative pole, and this voltage-stabiliser tube positive pole is connected with triode and forms;
Overcurrent delay circuit (5) is by the variable resistor and the diode of the parallel connection that is connected operational amplifier (18) output, and the variable resistor and the diode other end are connected with capacitor and form;
Phase shortage delay circuit (8) is by the parallel resistor and the diode that are connected operational amplifier (19) output, and the resistance and the diode other end are connected with capacitor and form;
Comprehensive amplifying circuit (12) is by the resistance that is connected operational amplifier (20) input, controllable silicon, and diode is formed.
2. electronic motor protector as claimed in claim 1 is characterized in that: be connected with the self-checking circuit of being made up of the on-line testing button (14) at three-phase current change-over circuit 2 outputs.
3. electronic motor protector as claimed in claim 1 is characterized in that: be connected with the phase shortage lock-in circuit of being made up of switch, resistance and the diode of series connection (9) at operational amplifier (19) input, output.
4. electronic motor protector as claimed in claim 1 is characterized in that: in operational amplifier (20), (19) output is connected with the failure indicating circuit of being made up of the switch of series connection and light-emitting diode (16).
5. electronic motor protector as claimed in claim 1 is characterized in that: in operational amplifier (20), (19) output is connected to the manual reset circuit (15) that a switch is formed.
6. electronic motor protector as claimed in claim 1 is characterized in that: the heat alarm generation circuit (11) that is connected to switch, thermistor, potentiometer and the controllable silicon composition of series connection at operational amplifier (20) input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99251177 CN2402041Y (en) | 1999-10-20 | 1999-10-20 | Electronic protector for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99251177 CN2402041Y (en) | 1999-10-20 | 1999-10-20 | Electronic protector for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2402041Y true CN2402041Y (en) | 2000-10-18 |
Family
ID=34035730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99251177 Expired - Fee Related CN2402041Y (en) | 1999-10-20 | 1999-10-20 | Electronic protector for motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2402041Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015081576A1 (en) * | 2013-12-07 | 2015-06-11 | 湖南省凯盈科技有限公司 | Electrically chargeable overtemperature/overcurrent protection module |
| CN109491295A (en) * | 2018-12-05 | 2019-03-19 | 岭澳核电有限公司 | Control system |
-
1999
- 1999-10-20 CN CN 99251177 patent/CN2402041Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015081576A1 (en) * | 2013-12-07 | 2015-06-11 | 湖南省凯盈科技有限公司 | Electrically chargeable overtemperature/overcurrent protection module |
| CN109491295A (en) * | 2018-12-05 | 2019-03-19 | 岭澳核电有限公司 | Control system |
| CN109491295B (en) * | 2018-12-05 | 2020-06-16 | 岭澳核电有限公司 | Control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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 |