CN104391197A - Electromagnet fault detection method and circuit, control method and circuit and circuit breaker - Google Patents
Electromagnet fault detection method and circuit, control method and circuit and circuit breaker Download PDFInfo
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- CN104391197A CN104391197A CN201410681571.6A CN201410681571A CN104391197A CN 104391197 A CN104391197 A CN 104391197A CN 201410681571 A CN201410681571 A CN 201410681571A CN 104391197 A CN104391197 A CN 104391197A
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Abstract
The invention discloses an electromagnet fault detection method and belongs to the low-voltage electrical technology field. The electromagnet fault detection method comprises judging whether an electromagnet breaks down or not according to the current change condition in an electromagnet power supply loop after starting of electrification and judging the electromagnet breaks down if currents do not decrease during a process that currents change from zero to a stable value. The invention also discloses an electromagnet fault detection circuit and an electromagnet fault control method and control circuit and a circuit breaker. According to the electromagnet fault detection method, the information that whether the electromagnet rightly acts or not is rightly judged through a circuit according to the current change rule of the power supply loop during the electromagnet actin process and an output signal is provided to clearly prompt the exterior whether the electromagnet rightly acts or not, convenience is brought for maintenance, warning and control, and the electromagnet fault detection method can be widely applied to various occasions using the electromagnet to drive an execution mechanism to act.
Description
Technical field
The present invention relates to a kind of electromagnet fault detection method, belong to low-voltage electrical technical field.
Background technology
Now the Electronic control of current isolating switch adopts electromagnet apparatus to perform an action mostly, as on/off switch operating mechanism etc.
Current electromagnet great majority are all the open loop approach circuit of single control, and control circuit sends action command to electromagnet, after namely passing to the control voltage required for it to electromagnet, just completes the control to electromagnet.
Under this control mode, if electromagnet breaks down, can not correctly action, control device can not obtain the not operating information of electromagnet.In this case, after sending electromagnet action command, if the topworks that electromagnet hits is not moved, cannot judge whether to be failure to actuate due to the topworks that electromagnet fault is not operating or other faults of topworks cause.
Minority electromagnet arranges a microswitch in the actuating length end of electromagnet, utilizes the break-make of microswitch to come to judge the action whether electromagnet is correct.This mode need increase the switch machine structure of microswitch, complex structure, and cost is high, and reliability is low.
Summary of the invention
Technical matters to be solved by this invention is to overcome prior art deficiency, provides a kind of electromagnet fault detection method, can whether correct operation carries out reliable recognition to electromagnet, and it is low to realize cost.
The present invention is concrete by the following technical solutions:
A kind of electromagnet fault detection method, judge whether electromagnet breaks down according to the curent change situation after from energising in electromagnet current supply circuit: as described in electric current there is not decline being changed in the process of a stationary value from zero, then judge electromagnet fault.
Preferably, described curent change situation obtains by carrying out monitoring to the voltage at the sample resistance two ends be connected in described electromagnet current supply circuit.
A kind of electromagnet control method, is characterized in that, utilizes electromagnet fault detection method described in above arbitrary technical scheme electromagnet to be carried out to the step of fault detect after being included in electromagnet energising.
A kind of electromagnet failure detector circuit, comprise and be serially connected in sample resistance in electromagnet current supply circuit and fault judging circuit, described fault judging circuit can be monitored described sample resistance both end voltage and judge whether electromagnet breaks down in accordance with the following methods according to monitoring result: as described in voltage from zero be changed in the process of a stationary value do not occur decline, then judge electromagnet fault.
A kind of electromagnet failure detector circuit, comprising: the current detecting unit that can detect the electric current in electromagnet current supply circuit and fault judging circuit; Described fault judging circuit the curent change situation detected by current detecting unit can judge whether electromagnet breaks down in accordance with the following methods: as described in electric current from zero be changed in the process of a stationary value do not occur decline, then judge electromagnet fault.
Following control circuit for electromagnet, isolating switch can also be obtained according to identical invention thinking:
A kind of control circuit for electromagnet, comprises electromagnet failure detector circuit described in above arbitrary technical scheme.
A kind of isolating switch, comprises at least one action actuating mechanism and for driving the electromagnet of this action actuating mechanism,
The control circuit of described electromagnet is above-mentioned control circuit.Described action actuating mechanism can be on/off switch operating mechanism etc.
Compared to existing technology, each technical scheme of the present invention has following beneficial effect:
Compared to existing whether be electromagnet fault by being learnt by the topworks hit, what the present invention can be correct judges whether to be the non-correct operation of electromagnet the fault and the topworks caused is failure to actuate.Judge electromagnet fault compared to by increasing microswitch, the present invention is obviously simple and reliable, saves with the physical construction of the promotion microswitch of complexity.And the present invention outwardly can point out the action of electromagnet whether positive angle clearly, all brings convenience to maintenance, alarm, control.
Accompanying drawing explanation
Fig. 1 is the curent change after the energising of non-failure conditions lower electromagnet in its current supply circuit;
Fig. 2 is the structural representation of an embodiment of control circuit for electromagnet of the present invention;
Fig. 3 is the sample resistance both end voltage change be connected under non-failure conditions in electromagnet current supply circuit;
Fig. 4 is the sample resistance both end voltage change be connected under failure condition in electromagnet current supply circuit;
Fig. 5 is the control flow chart of the control circuit for electromagnet of Fig. 2;
Fig. 6 is the practical circuit diagram of the control circuit for electromagnet of Fig. 2.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail:
Thinking of the present invention realizes whether there is fault to electromagnet according to the curent change rule of its current supply circuit in electromagnet course of action to detect.First ultimate principle of the present invention is described below:
After starting from electromagnet energising, rise in stable time t1 at the electric current of electromagnet, if electromagnet L regular event, the motion of electromagnet L in the adhesive stage due to electromagnet L inner core, electromagnetism air gap is reduced rapidly, air-gap reluctance reduces rapidly, magnetic flux increases sharply, thus produce larger inverse electromotive force at coil two ends, this inverse electromotive force makes the electric current I of coil reduce rapidly, until after coil adhesive, iron core no longer moves, air-gap reluctance no longer changes, magnetic flux no longer increases sharply, no longer produce larger inverse electromotive force, coil current steadily will be increased to steady state (SS).The curent change situation of its current supply circuit as shown in Figure 1, curent change curve can exist an obvious negative edge; And as electromagnet L because itself or other reason cannot correct operations, after energising, its electric current I then continues to rise to steady state (SS), there will not be decline phenomenon.Technical scheme of the present invention can be obtained as follows according to this rule:
A kind of electromagnet fault detection method, judge whether electromagnet breaks down according to the curent change situation after from energising in electromagnet current supply circuit: as described in electric current there is not decline being changed in the process of a stationary value from zero, then judge electromagnet fault.
Technique scheme can realize by detecting the electric current in electromagnet current supply circuit, namely adopts following electromagnet failure detector circuit to realize:
A kind of electromagnet failure detector circuit, comprising: the current detecting unit that can detect the electric current in electromagnet current supply circuit and fault judging circuit; Described fault judging circuit the curent change situation detected by current detecting unit can judge whether electromagnet breaks down in accordance with the following methods: as described in electric current from zero be changed in the process of a stationary value do not occur decline, then judge electromagnet fault.
Consider simplification and the cost of circuit, the present invention obtains described curent change situation preferably by carrying out monitoring to the voltage at the sample resistance two ends be connected in described electromagnet current supply circuit; Namely adopt with lower electromagnet failure detector circuit:
Plant electromagnet failure detector circuit, comprise and be serially connected in sample resistance in electromagnet current supply circuit and fault judging circuit, described fault judging circuit can be monitored described sample resistance both end voltage and judge whether electromagnet breaks down in accordance with the following methods according to monitoring result: as described in voltage from zero be changed in the process of a stationary value do not occur decline, then judge electromagnet fault.
For the ease of public understanding, with a specific embodiment, technical solution of the present invention is described in detail below.
As shown in Figure 2, this control circuit comprises the basic structure of the control circuit for electromagnet in the present embodiment: the power circuit be connected with external power source and electromagnet L; Be connected between external power source and power circuit and electromagnet L, for controlling the open close gauge tap SB1 of external power source; Be connected with electromagnet L for the electronic switch S disconnected with connect electromagnet L working power; The sample resistance R be connected with electronic switch S; For judging the fault judging circuit whether electromagnet L action is correct; For the control circuit of the disconnection and connection that control electronic switch S; And provide the power circuit of power supply for fault judging circuit, control circuit.When the L action of needs electromagnet, gauge tap SB1 is connected, after SB1 connects, voltage U 1 is set up in circuit, voltage U 1 is converted to the working power of low-voltage U2 as fault judging circuit and control circuit by power circuit, controls electronic switch S and connects, electromagnet L is obtained electric after control circuit work, electromagnet L obtain electric after should action immediately, this waveform being engraved in the voltage U 3 on sample resistance R will reflect the electric current I change of electromagnet L really.Rise in stable time t1 at the electric current of electromagnet, if electromagnet L regular event, the motion of electromagnet L in the adhesive stage due to electromagnet L inner core, electromagnetism air gap is reduced rapidly, air-gap reluctance reduces rapidly, magnetic flux increases sharply, thus produce larger inverse electromotive force at coil two ends, this inverse electromotive force makes the electric current I of coil reduce rapidly, until after coil adhesive, iron core no longer moves, air-gap reluctance no longer changes, magnetic flux no longer increases sharply, no longer produce larger inverse electromotive force, coil current steadily will be increased to steady state (SS), in the adhesive stage of electromagnet, sample resistance R is due to the change of electric current I, voltage U 3 on resistance R can change simultaneously, when electric current I reduces rapidly, fault judging circuit judge voltage U 3 on sample resistance R together with time decline, now the waveform of voltage U 3 as shown in Figure 3, fault judging circuit can be normal according to the waveform determination electromagnet L of now U3.If electromagnet L due to itself or other reason cannot correct operation, after energising, its electric current I then continues to rise to steady state (SS), there will not be decline phenomenon, fault judging circuit judges that the voltage U 3 on sample resistance R does not exist decline phenomenon yet, now voltage U 3 waveform as shown in Figure 3, and fault judging circuit can according to the waveform determination electromagnet L fault of now U3.
The control flow of this control circuit as shown in Figure 5, after control circuit controls electronic switch S connection, send actuating signal to fault judging circuit simultaneously, after fault judging circuit receives actuating signal, rise in stable time t1 at the electric current of electromagnet L, the voltage U 3 of sample resistance R is judged, judge whether its voltage exists decline process as shown in Figure 3, if voltage U 3 exists decline process, then electromagnet action is correct, otherwise then electromagnet L action is incorrect.When detect electromagnet L action incorrect after, simultaneous faults decision circuitry sends electromagnet fault-signal, the fault of prompting staff autotelic inspection solenoid part.
Those skilled in the art can design the side circuit of above-mentioned control circuit easily, Fig. 6 shows wherein a kind of, as shown in the figure, control circuit and fault judging circuit are realized by control chip MCU, power electric routing resistance R2, resistance R3, electric capacity C1 forms, power circuit provides working power by forming working power U2 after the high-voltage power supply U1 step-down filtering of input for control chip MCU, electronic switch S is made up of metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q1 and sample resistance R1 is series in the loop of magnet coil L1, for controlling the break-make of electromagnet, and detect the change of electromagnet current I.After controlling to close SB1 connection, obtain voltage U 2 after the high-voltage power supply U1 inputted is changed by low-voltage power circuit and be supplied to control chip MCU as working power, after control chip MCU works, metal-oxide-semiconductor Q1 conducting is controlled by the E2 pin output order of control chip, electromagnet L obtains electric, carry out suction action, current waveform after electromagnet L is energized is transformed into voltage U 3 by resistance R1 and sends into the E3 pin of control chip MCU, control chip MCU is according to the waveform of voltage U 3 and judge electromagnet L whether normal adhesive in conjunction with going code of metal-oxide-semiconductor, if rise in stable time t1 at the electric current of electromagnet, there is decline process in voltage U 3, then electromagnet L action is correct.If rise in stable time t1 at the electric current of electromagnet, voltage U 3 there will not be decline phenomenon, the then abnormal adhesive of electromagnet L, exports electromagnet fault-signal by the E4 pin of control chip MCU simultaneously, makes pilot lamp DS or other type of alarms send alerting signal.
Technical scheme of the present invention only needs simple circuit to realize, do not need the physical construction using complicated promotion microswitch, its cost is lower, volume is less, the various occasions using the action of solenoid actuated topworks can be widely used in, such as, in isolating switch, utilize the on/off switch operating mechanism of solenoid actuated, fault detection method of the present invention, circuit can be utilized to carry out electromagnet fault detect, utilize control method of the present invention, control circuit controls electromagnet.
Claims (9)
1. an electromagnet fault detection method, it is characterized in that, judge whether electromagnet breaks down according to the curent change situation after from energising in electromagnet current supply circuit: as described in electric current there is not decline being changed in the process of a stationary value from zero, then judge electromagnet fault.
2. electromagnet fault detection method as claimed in claim 1, is characterized in that, described curent change situation obtains by carrying out monitoring to the voltage at the sample resistance two ends be connected in described electromagnet current supply circuit.
3. an electromagnet control method, is characterized in that, utilizes electromagnet fault detection method described in claim 1 or 2 electromagnet to be carried out to the step of fault detect after being included in electromagnet energising.
4. electromagnet control method as claimed in claim 3, is characterized in that, be also included in the step of carrying out after electromagnet fault being detected reporting to the police.
5. an electromagnet failure detector circuit, it is characterized in that, comprise and be serially connected in sample resistance in electromagnet current supply circuit and fault judging circuit, described fault judging circuit can be monitored described sample resistance both end voltage and judge whether electromagnet breaks down in accordance with the following methods according to monitoring result: as described in voltage from zero be changed in the process of a stationary value do not occur decline, then judge electromagnet fault.
6. an electromagnet failure detector circuit, is characterized in that, comprising: the current detecting unit that can detect the electric current in electromagnet current supply circuit and fault judging circuit; Described fault judging circuit the curent change situation detected by current detecting unit can judge whether electromagnet breaks down in accordance with the following methods: as described in electric current from zero be changed in the process of a stationary value do not occur decline, then judge electromagnet fault.
7. a control circuit for electromagnet, is characterized in that, comprises electromagnet failure detector circuit as described in claim 5 or 6.
8. an isolating switch, comprises at least one action actuating mechanism and for driving the electromagnet of this action actuating mechanism, it is characterized in that, the control circuit of described electromagnet is control circuit described in claim 7.
9. isolating switch as claimed in claim 8, it is characterized in that, described action actuating mechanism is on/off switch operating mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410681571.6A CN104391197A (en) | 2014-11-24 | 2014-11-24 | Electromagnet fault detection method and circuit, control method and circuit and circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410681571.6A CN104391197A (en) | 2014-11-24 | 2014-11-24 | Electromagnet fault detection method and circuit, control method and circuit and circuit breaker |
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| CN104391197A true CN104391197A (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410681571.6A Pending CN104391197A (en) | 2014-11-24 | 2014-11-24 | Electromagnet fault detection method and circuit, control method and circuit and circuit breaker |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132573A (en) * | 2019-06-19 | 2019-08-16 | 西南大学 | A kind of operated pneumatic valve fault detection and diagnosis device |
| CN111649027A (en) * | 2019-07-02 | 2020-09-11 | 涌镇液压机械（上海）有限公司 | Device and method for detecting jamming of electromagnetic directional valve |
| CN111880089A (en) * | 2020-07-27 | 2020-11-03 | 深圳市宗泰电机有限公司 | Electromagnet action state testing method and device |
| CN115453393A (en) * | 2022-08-05 | 2022-12-09 | 华帝股份有限公司 | Self-checking control method of electromagnetic valve |
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| CN2888460Y (en) * | 2006-02-10 | 2007-04-11 | 常熟理工学院 | Multi channel magnet real-time rapid detection device |
| CN201583585U (en) * | 2009-10-21 | 2010-09-15 | 北京兴大豪科技开发有限公司 | Electromagnet fault monitoring device |
| CN203745577U (en) * | 2014-03-13 | 2014-07-30 | 贵州长征中压开关设备有限公司 | Hand-held bidirectional DC electromagnet detecting device |
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2014
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Patent Citations (3)
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| CN2888460Y (en) * | 2006-02-10 | 2007-04-11 | 常熟理工学院 | Multi channel magnet real-time rapid detection device |
| CN201583585U (en) * | 2009-10-21 | 2010-09-15 | 北京兴大豪科技开发有限公司 | Electromagnet fault monitoring device |
| CN203745577U (en) * | 2014-03-13 | 2014-07-30 | 贵州长征中压开关设备有限公司 | Hand-held bidirectional DC electromagnet detecting device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110132573A (en) * | 2019-06-19 | 2019-08-16 | 西南大学 | A kind of operated pneumatic valve fault detection and diagnosis device |
| CN111649027A (en) * | 2019-07-02 | 2020-09-11 | 涌镇液压机械（上海）有限公司 | Device and method for detecting jamming of electromagnetic directional valve |
| CN111880089A (en) * | 2020-07-27 | 2020-11-03 | 深圳市宗泰电机有限公司 | Electromagnet action state testing method and device |
| CN111880089B (en) * | 2020-07-27 | 2023-05-30 | 深圳市宗泰电机有限公司 | Electromagnet action state testing method and device |
| CN115453393A (en) * | 2022-08-05 | 2022-12-09 | 华帝股份有限公司 | Self-checking control method of electromagnetic valve |
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Application publication date: 20150304 |