CN102222900B - Electric leakage protective module of alternating-current electric apparatus capable of resisting instantaneous high-voltage impact - Google Patents
Electric leakage protective module of alternating-current electric apparatus capable of resisting instantaneous high-voltage impact Download PDFInfo
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- CN102222900B CN102222900B CN201110174099.3A CN201110174099A CN102222900B CN 102222900 B CN102222900 B CN 102222900B CN 201110174099 A CN201110174099 A CN 201110174099A CN 102222900 B CN102222900 B CN 102222900B
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Abstract
The invention discloses an electric leakage protective module of an alternating-current electric apparatus capable of resisting instantaneous high-voltage impact. The anode of a diode D1 is connected with the cathode of a diode D2; the cathode of the diode D1 is connected with an electrical leakage detecting hole of a protective circuit; the anode of the diode D2 is connected with one end of a resistor R1; the other end of the resistor R1 is connected with the anode of a diode D8 by a connecting point A; the cathode of the diode D8 is connected with an input terminal of a comparator by a connecting point C; the anode of a diode D7 is connected with a connecting point B; the cathode of the diode D7 is connected with another input terminal of the comparator; the connecting point A is connected with one end of a resistor R2; the other end of the resistor R2 is connected with a power supply VCC; simultaneously the connecting point A is connected with one end of a resistor R3; and the other end of the resistor R3 is connected with the anode of a diode D3; and the cathode of the diode D3 is grounded (GND).
Description
Technical field
The invention belongs to technical field of electricity, the leakage protection module that particularly the anti-instantaneous pressure of a kind of ac electric apparatus impacts.
Background technology
At present, the electric equipment such as feeding switch, starter in the power supply unit of colliery must possess leakage latching protection function.Because earth leakage search/lockout loop must directly be connected with the main current supply circuit of motor.Motor is implemented detection of electrical leakage under holding state, earth leakage search/lockout must be detected to loop and disconnect when motor operation.Motor obtains after electric and can cause high voltage to pour detection of electrical leakage mouth owing to not in time not disconnecting earth leakage search/lockout loop; And motor while shutting down owing to dropping into the too fast detection of electrical leakage mouth of also back-emf of motor can being introduced in earth leakage search/lockout loop, thereby cause the burnout phenomenon of leakage current detection protection circuit.The method of the conventional time delay closing relay of each producer is avoided pour (blocking type) of back-emf that motor shuts down for this reason; but motor obtains the problem that how to disconnect in time leakage detecting circuit after electric and is not resolved, and often can burn out leakage detecting circuit.
The earth leakage search/lockout circuit of the current mining equipment of seeing is introduced directly into comparison circuit after adopting and detecting, and does not adopt blocking circuit; And in testing circuit, lack high voltage and dredge circuit; Burning out of testing circuit and comparison circuit will be caused very soon once therefore there be high voltage to pour.
Summary of the invention
The object of this invention is to provide the leakage protection module that the anti-instantaneous pressure of a kind of ac electric apparatus impacts; to solve in prior art; motor electric after owing to not disconnecting in time leakage detecting circuit; and back-emf after motor dead electricity pours leakage detecting circuit, the problem that causes the leakage detecting circuit being connected with motor to burn out.
The leakage protection module that the anti-instantaneous pressure of a kind of ac electric apparatus impacts; the positive pole of diode D1 connects the negative pole of diode D2; the negative pole of diode D1 connects the detection of electrical leakage mouth of described protection module; one end of the anodal connecting resistance R1 of diode D2; the other end of resistance R 1 connects the positive pole of diode D8 through tie point A, the negative pole of diode D8 connects an input of comparator through tie point C, and the positive pole of diode D7 is contact B in succession; the negative pole of diode D7 connects another input of comparator
One end of tie point A connecting resistance R2, another termination power VCC of resistance R 2, meanwhile, and one end of tie point A connecting resistance R3, the positive pole of another terminating diode D3 of resistance R 3, the minus earth GND of diode D3,
One end of tie point B connecting resistance R5, another termination power VCC of resistance R 5, meanwhile, and one end of tie point B connecting resistance R4, the positive pole of another terminating diode D4 of resistance R 4, the minus earth GND of diode D4,
The negative pole of diode D7 connects the positive pole of diode D5, and the negative pole of diode D5 meets power supply VCC, and meanwhile, the negative pole of diode D7 connects the negative pole of diode D6, the plus earth GND of diode D6,
Power supply VCC and ground GND flying capcitor C0,
The output of comparator is the logical value output of described protection module.
Protection module of the present invention is, the electric-leakage detection circuit of a kind of " leading-type " tolerance moment (< 3S) high-voltage impact, and it can overcome high-voltage impact, and protection leakage detecting circuit exempts from damage.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of leakage protection module of the present invention
Fig. 2 is the analysis principle figure of leakage protection module of the present invention
Embodiment
As shown in Figure 1, the leakage protection module that the anti-instantaneous pressure of ac electric apparatus of the present invention impacts, the positive pole of diode D1 connects the negative pole of diode D2, the negative pole of diode D1 connects the detection of electrical leakage mouth of described protection module, one end of the anodal connecting resistance R1 of diode D2, the other end of resistance R 1 connects the positive pole of diode D8 through tie point A, the negative pole of diode D8 connects an input of comparator through tie point C, the positive pole of diode D7 is contact B in succession, the negative pole of diode D7 connects another input of comparator, one end of tie point A connecting resistance R2, another termination power VCC of resistance R 2, simultaneously, one end of tie point A connecting resistance R3, the positive pole of another terminating diode D3 of resistance R 3, the minus earth GND of diode D3, one end of tie point B connecting resistance R5, another termination power VCC of resistance R 5, simultaneously, one end of tie point B connecting resistance R4, the positive pole of another terminating diode D4 of resistance R 4, the minus earth GND of diode D4, the negative pole of diode D7 connects the positive pole of diode D5, the negative pole of diode D5 meets power supply VCC, simultaneously, the negative pole of diode D7 connects the negative pole of diode D6, the plus earth GND of diode D6, power supply VCC and ground GND flying capcitor C0, the output of comparator is the logical value output of described protection module.
As shown in Figure 2, technical scheme of the present invention is, a kind ofly comprises the leakage latching protection module that regulation high voltage flows to and provide high voltage to dredge passage.Can analyze from following 3 parts, comprising: detect and dredge circuit, blocking circuit and comparison circuit.
Module of the present invention is; after pouring detection mouth, ac high voltage stipulates its flow direction; and providing tolerating high voltage to impact the passage of dredging more than 3S, motor back-emf when earth leakage search/lockout loop does not have disconnect in time and shut down while overcoming because of start impacts, protection earth leakage search/lockout circuit.Core of the present invention is to detect to dredge circuit and blocking circuit.
Formed to detect by R2*, R1* and D1～D6 and dredge circuit.Wherein D1～D6 has blocked the inflow that exchanges positive half cycle, and direct current sense channel and comparison signal passage are provided simultaneously; The positive half wave of the ac high-voltage therefore, pouring can not form passage because of the blocking-up of Unidirectional flow-limiting circuit; The negative half-wave of the ac high voltage pouring is through inner DC power supply GND-> VCC (or C0, and D5, D6)-> detects and dredges circuit (R2*, R1*, D2, D1)-> detection mouthful (flow direction in Fig. 2 is 1.) formation passage.Wherein part of devices and detection of electrical leakage passage are public, therefore dredge circuit and must bear and can bear high-voltage impact the function of detection of electrical leakage passage (flow direction in Fig. 2 2.) can be provided again.
Block and exchanged negative half period and flow to the input terminal flow direction of flow detection mouth (flow direction in Fig. 2 3.) again of comparator through the power supply terminal of comparator by D7, D8, provide direct current detection of electrical leakage signal and comparison signal to flow to the direct current channel of comparator simultaneously.
In Fig. 2, this earth leakage search/lockout module is by detection of electrical leakage mouth and the input of GND end; Externally output leakage latching protection signal (" high/low " logic level).Wherein:
1) in Fig. 2, Ro is the leak resistance of motor of hypothesis, and it detects loop and sees in figure 2. trend;
2) in Fig. 2, E0 is the ac high voltage of hypothesis, and 1. trend is seen in figure in its loop;
3) tie point A, B in Fig. 2, C test point when pouring high voltage.
Coal mine bends down and is installed with available electricity grade and is mostly 1140/660VAC, the test as an example of 1140Vac example, and its phase voltage is 660VAC.Not in time do not disconnect if motor obtains electric rear earth leakage search/lockout loop, the detection of electrical leakage mouth in Fig. 1 also keeps the state of a certain phase that accesses motor, the GND in Fig. 2 connect " ", that also may pour detection of electrical leakage mouth high pressure is phase voltage 660VAC.
Claims (1)
1. the leakage protection module that the anti-instantaneous pressure of ac electric apparatus impacts; it is characterized in that; the positive pole of diode D1 connects the negative pole of diode D2; the negative pole of diode D1 connects the detection of electrical leakage mouth of described protection module, one end of the anodal connecting resistance R1 of diode D2, and the other end of resistance R 1 connects the positive pole of diode D8 through tie point A; the negative pole of diode D8 connects an input of comparator through tie point C; the positive pole of diode D7 is contact B in succession, and the negative pole of diode D7 connects another input of comparator
One end of tie point A connecting resistance R2, another termination power VCC of resistance R 2, meanwhile, and one end of tie point A connecting resistance R3, the positive pole of another terminating diode D3 of resistance R 3, the minus earth GND of diode D3,
One end of tie point B connecting resistance R5, another termination power VCC of resistance R 5, meanwhile, and one end of tie point B connecting resistance R4, the positive pole of another terminating diode D4 of resistance R 4, the minus earth GND of diode D4,
The negative pole of diode D7 connects the positive pole of diode D5, and the negative pole of diode D5 meets power supply VCC, and meanwhile, the negative pole of diode D7 connects the negative pole of diode D6, the plus earth GND of diode D6,
Power supply VCC and ground GND flying capcitor C0,
The output of comparator is the logical value output of described protection module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110174099.3A CN102222900B (en) | 2011-06-24 | 2011-06-24 | Electric leakage protective module of alternating-current electric apparatus capable of resisting instantaneous high-voltage impact |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110174099.3A CN102222900B (en) | 2011-06-24 | 2011-06-24 | Electric leakage protective module of alternating-current electric apparatus capable of resisting instantaneous high-voltage impact |
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| Publication Number | Publication Date |
|---|---|
| CN102222900A CN102222900A (en) | 2011-10-19 |
| CN102222900B true CN102222900B (en) | 2014-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110174099.3A Active CN102222900B (en) | 2011-06-24 | 2011-06-24 | Electric leakage protective module of alternating-current electric apparatus capable of resisting instantaneous high-voltage impact |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103197194B (en) * | 2013-03-28 | 2015-07-22 | 山西潞安矿业(集团)有限责任公司 | Earth leakage lockout detecting circuit |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85200741U (en) * | 1985-04-12 | 1986-01-01 | 骆金山 | Multiple-protection contactor for three-phase electric motor |
| CN2582243Y (en) * | 2002-11-08 | 2003-10-22 | 杨运富 | Comprehensive protective device for coal mine motor |
| CN2766452Y (en) * | 2004-11-17 | 2006-03-22 | 刘力 | Intelligent controller |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI362152B (en) * | 2008-01-10 | 2012-04-11 | Delta Electronics Inc | Over-voltage protection circuit and method thereof |
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2011
- 2011-06-24 CN CN201110174099.3A patent/CN102222900B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85200741U (en) * | 1985-04-12 | 1986-01-01 | 骆金山 | Multiple-protection contactor for three-phase electric motor |
| CN2582243Y (en) * | 2002-11-08 | 2003-10-22 | 杨运富 | Comprehensive protective device for coal mine motor |
| CN2766452Y (en) * | 2004-11-17 | 2006-03-22 | 刘力 | Intelligent controller |
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| CN102222900A (en) | 2011-10-19 |
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