CN204333927U - A kind of current foldback circuit exchanging electric drill - Google Patents
A kind of current foldback circuit exchanging electric drill Download PDFInfo
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- CN204333927U CN204333927U CN201420722560.3U CN201420722560U CN204333927U CN 204333927 U CN204333927 U CN 204333927U CN 201420722560 U CN201420722560 U CN 201420722560U CN 204333927 U CN204333927 U CN 204333927U
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- type triode
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- electric drill
- power supply
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- 230000001681 protective effect Effects 0.000 abstract description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
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Abstract
A kind of current foldback circuit exchanging electric drill of the utility model, belongs to the technical field of electric drill current foldback circuit; The technical problem solved is: provide a kind of protective circuit preventing the drill-through stream of alternating current; The technical scheme adopted is: a kind of current foldback circuit exchanging electric drill, comprise transformer T1, rectification circuit U1, three-terminal voltage-stabilizing power supply chip IC1, thyristor VT1, starting switch K1, change over switch K2, relay ZJ1, its coil is ZJ1.1, its normally-closed contact is ZJ1.2, when circuit overcurrent, can fast shut-off power supply, and send alarm; Be applicable to electric drill field.
Description
Technical field
A kind of current foldback circuit exchanging electric drill of the utility model, belongs to the technical field of electric drill current foldback circuit.
Background technology
Electric drill is the drilling machine utilizing electric energy to do power, it is the conventional products in electric tool, also be the electric tool series products had the call, the operation principle of electric drill is that the rotor of electromagnetic rotating formula or electromagnetic reciprocating low capacity motor does magnetic field intercepts acting running, apparatus for work is driven by transmission mechanism, driven gear strengthens the power of drill bit, thus makes drill bit scraping material surface, better pierces object; Electric drill have easy to carry, use time saving and energy saving advantage, be widely used in the field such as construction and installation, medical application; But, in the use procedure of electric drill, because the reasons such as using method is improper, service time is long cause stifled boring, and then cause overcurrent to burn out electric drill, affect the normal use of electric drill; At present, for solving the problem that electric drill easily burns out, conventional way is by increasing stifled brill defencive function on electric drill, but this kind of electric drill price is high, is not easy to promote the use of.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical problem to be solved is: provide a kind of protective circuit preventing the drill-through stream of alternating current.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of current foldback circuit exchanging electric drill, comprise transformer T1, be connected with 220V AC power after the input serial connection starting switch K1 of described transformer T1, the output of described transformer T1 is connected with the input of rectification circuit U1, the forward dc output of described rectification circuit U1 is also connected with the input of three-terminal voltage-stabilizing power supply chip IC1 after connecing the collector electrode of NPN type triode Q4, the earth terminal of described three-terminal voltage-stabilizing power supply chip IC1 is connected with one end of resistance R5, the other end of described resistance R5 also connects one end of adjustable resistance R6, one end of adjustable resistance R7 is connected with the output of described three-terminal voltage-stabilizing power supply chip IC1 with behind one end of resistance R8, the other end of described resistance R8 is connected with the base stage of described NPN type triode Q4, the emitter of described NPN type triode Q4 is connected with one end of resistance R9, one end of the other end shunt-wound capacitance C1 of described resistance R9, one end of indicator light L1 is connected with the collector electrode of NPN type triode Q2 with after the collector electrode of NPN type triode Q1, the emitter of described NPN type triode Q1 is connected with the base stage of described NPN type triode Q2,
The other end of described indicator light L1 is also connected with the anode of thyristor VT1 after connecing the base stage of described NPN type triode Q1, the negative electrode of described thyristor VT1 is connected with one end of the coil ZJ1.1 of relay ZJ1, the emitter of described NPN type triode Q2 is also connected with a stiff end of adjustable resistance R2 after connecing the emitter of PNP type triode Q3 and one end of resistance R1, the movable end of described adjustable resistance R2 is connected with the base stage of described PNP type triode Q3, the collector electrode of described PNP type triode Q3 is connected with one end of resistance R3, the other end of described resistance R3 is also connected with the gate pole of described thyristor VT1 behind one end of connecting resistance R4, the other end of described resistance R1 is also connected with one end of the normally-closed contact ZJ1.2 of described relay ZJ1 after connecing another stiff end of described adjustable resistance R2, the other end of the normally-closed contact ZJ1.2 of described relay ZJ1 is connected with an end of incoming cables of change over switch K2, another end of incoming cables of described change over switch K2 also connects the other end of described resistance R4, the other end of the coil ZJ1.1 of described relay ZJ1, the other end of described electric capacity C1, the other end of described adjustable resistance R7 is connected with the negative sense DC output end of described rectification circuit U1 with after the other end of described adjustable resistance R6, the leading-out terminal of described change over switch K2 is attempted by the two ends of electric drill motor M 1, in the present embodiment, the model of described three-terminal voltage-stabilizing power supply chip IC1 can be LM917.
The utility model compared with prior art has following beneficial effect:
A kind of current foldback circuit exchanging electric drill of the utility model, comprise transformer T1, rectification circuit U1, three-terminal voltage-stabilizing power supply chip IC1, thyristor VT1, starting switch K1, change over switch K2, relay ZJ1, its coil is ZJ1.1, its normally-closed contact is ZJ1.2, when circuit load is excessive, when there is the phenomenons such as stifled brill, the coil ZJ1.1 of relay ZJ1 obtains electric, the normally-closed contact ZJ1.2 of relay ZJ1 disconnects, indicator light L1 lights simultaneously, and display is shut down, and needs to reopen starting switch K1; The utility model can the over-current signal of observation circuit accurately, and when circuit overcurrent, cut-out motor power that can be quick and complete, and the instruction that gives the alarm, whole circuit structure is succinct, safe and reliable, practical.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail;
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
As shown in Figure 1, a kind of current foldback circuit exchanging electric drill of the utility model, comprise transformer T1, be connected with 220V AC power after the input serial connection starting switch K1 of described transformer T1, the output of described transformer T1 is connected with the input of rectification circuit U1, the forward dc output of described rectification circuit U1 is also connected with the input of three-terminal voltage-stabilizing power supply chip IC1 after connecing the collector electrode of NPN type triode Q4, the earth terminal of described three-terminal voltage-stabilizing power supply chip IC1 is connected with one end of resistance R5, the other end of described resistance R5 also connects one end of adjustable resistance R6, one end of adjustable resistance R7 is connected with the output of described three-terminal voltage-stabilizing power supply chip IC1 with behind one end of resistance R8, the other end of described resistance R8 is connected with the base stage of described NPN type triode Q4, the emitter of described NPN type triode Q4 is connected with one end of resistance R9, one end of the other end shunt-wound capacitance C1 of described resistance R9, one end of indicator light L1 is connected with the collector electrode of NPN type triode Q2 with after the collector electrode of NPN type triode Q1, the emitter of described NPN type triode Q1 is connected with the base stage of described NPN type triode Q2,
The other end of described indicator light L1 is also connected with the anode of thyristor VT1 after connecing the base stage of described NPN type triode Q1, the negative electrode of described thyristor VT1 is connected with one end of the coil ZJ1.1 of relay ZJ1, the emitter of described NPN type triode Q2 is also connected with a stiff end of adjustable resistance R2 after connecing the emitter of PNP type triode Q3 and one end of resistance R1, the movable end of described adjustable resistance R2 is connected with the base stage of described PNP type triode Q3, the collector electrode of described PNP type triode Q3 is connected with one end of resistance R3, the other end of described resistance R3 is also connected with the gate pole of described thyristor VT1 behind one end of connecting resistance R4, the other end of described resistance R1 is also connected with one end of the normally-closed contact ZJ1.2 of described relay ZJ1 after connecing another stiff end of described adjustable resistance R2, the other end of the normally-closed contact ZJ1.2 of described relay ZJ1 is connected with an end of incoming cables of change over switch K2, another end of incoming cables of described change over switch K2 also connects the other end of described resistance R4, the other end of the coil ZJ1.1 of described relay ZJ1, the other end of described electric capacity C1, the other end of described adjustable resistance R7 is connected with the negative sense DC output end of described rectification circuit U1 with after the other end of described adjustable resistance R6, the leading-out terminal of described change over switch K2 is attempted by the two ends of electric drill motor M 1, the model of described three-terminal voltage-stabilizing power supply chip IC1 is LM917.
Particularly, when electric drill normally uses, triode Q1 and triode Q2 conducting, the emitter of triode Q3 and the pressure drop at base stage two ends are not enough to make triode Q3 conducting, and triode Q3 ends, and thyristor VT1 also ends; Further; when electric drill circuit load is excessive; when there is the phenomenons such as stifled brill; the emitter of triode Q3 and the pressure drop at base stage two ends strengthen; triode Q3 is by ending change conducting; thyristor VT1 fast conducting, after thyristor VT1 conducting, makes the base potential of triode Q1 close to 0 volt; triode Q1 and triode Q2 ends; meanwhile, the coil ZJ1.1 of relay ZJ1 obtains electric, and the normally-closed contact ZJ1.2 of relay ZJ1 disconnects; quick and complete cut-out motor power; indicator light L1 is bright, and display is shut down, and needs to reopen starting switch K1.
In the present embodiment, the resistance of resistance R1 is very little, to reduce the loss in circuit, when regulating the movable end of adjustable resistance R2 to make the electric current of motor M 1 reach institute's limit value, there is the potential difference of 0.7 ~ 1V at the emitter of triode Q3 and base stage two ends, make triode Q3 enter conducting state, indicator light L1 both as indicator light, again as the base resistance of triode Q1.
The current foldback circuit of the interchange electric drill in the present embodiment can the over-current signal of testing circuit accurately; and cut-out motor power that can be quick and complete; and the instruction that can give the alarm; whole circuit structure is succinct; safe and reliable; there is substantive distinguishing features and progress; by reference to the accompanying drawings embodiment of the present utility model is explained in detail above; but the utility model is not limited to above-described embodiment; in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from the utility model aim.
Claims (2)
1. one kind exchanges the current foldback circuit of electric drill, it is characterized in that: comprise transformer T1, be connected with 220V AC power after the input serial connection starting switch K1 of described transformer T1, the output of described transformer T1 is connected with the input of rectification circuit U1, the forward dc output of described rectification circuit U1 is also connected with the input of three-terminal voltage-stabilizing power supply chip IC1 after connecing the collector electrode of NPN type triode Q4, the earth terminal of described three-terminal voltage-stabilizing power supply chip IC1 is connected with one end of resistance R5, the other end of described resistance R5 also connects one end of adjustable resistance R6, one end of adjustable resistance R7 is connected with the output of described three-terminal voltage-stabilizing power supply chip IC1 with behind one end of resistance R8, the other end of described resistance R8 is connected with the base stage of described NPN type triode Q4, the emitter of described NPN type triode Q4 is connected with one end of resistance R9, one end of the other end shunt-wound capacitance C1 of described resistance R9, one end of indicator light L1 is connected with the collector electrode of NPN type triode Q2 with after the collector electrode of NPN type triode Q1, the emitter of described NPN type triode Q1 is connected with the base stage of described NPN type triode Q2,
The other end of described indicator light L1 is also connected with the anode of thyristor VT1 after connecing the base stage of described NPN type triode Q1, the negative electrode of described thyristor VT1 is connected with one end of the coil ZJ1.1 of relay ZJ1, the emitter of described NPN type triode Q2 is also connected with a stiff end of adjustable resistance R2 after connecing the emitter of PNP type triode Q3 and one end of resistance R1, the movable end of described adjustable resistance R2 is connected with the base stage of described PNP type triode Q3, the collector electrode of described PNP type triode Q3 is connected with one end of resistance R3, the other end of described resistance R3 is also connected with the gate pole of described thyristor VT1 behind one end of connecting resistance R4, the other end of described resistance R1 is also connected with one end of the normally-closed contact ZJ1.2 of described relay ZJ1 after connecing another stiff end of described adjustable resistance R2, the other end of the normally-closed contact ZJ1.2 of described relay ZJ1 is connected with an end of incoming cables of change over switch K2, another end of incoming cables of described change over switch K2 also connects the other end of described resistance R4, the other end of the coil ZJ1.1 of described relay ZJ1, the other end of described electric capacity C1, the other end of described adjustable resistance R7 is connected with the negative sense DC output end of described rectification circuit U1 with after the other end of described adjustable resistance R6, the leading-out terminal of described change over switch K2 is attempted by the two ends of electric drill motor M 1.
2. a kind of current foldback circuit exchanging electric drill according to claim 1, is characterized in that: the model of described three-terminal voltage-stabilizing power supply chip IC1 is LM917.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420722560.3U CN204333927U (en) | 2014-11-27 | 2014-11-27 | A kind of current foldback circuit exchanging electric drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420722560.3U CN204333927U (en) | 2014-11-27 | 2014-11-27 | A kind of current foldback circuit exchanging electric drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204333927U true CN204333927U (en) | 2015-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420722560.3U Withdrawn - After Issue CN204333927U (en) | 2014-11-27 | 2014-11-27 | A kind of current foldback circuit exchanging electric drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204333927U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505810A (en) * | 2014-11-27 | 2015-04-08 | 国家电网公司 | Over-current protection circuit of AC electric drill |
-
2014
- 2014-11-27 CN CN201420722560.3U patent/CN204333927U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505810A (en) * | 2014-11-27 | 2015-04-08 | 国家电网公司 | Over-current protection circuit of AC electric drill |
| CN104505810B (en) * | 2014-11-27 | 2018-04-27 | 国家电网公司 | Exchange the current foldback circuit of electric drill |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150513 Effective date of abandoning: 20180427 |