CN201252525Y

CN201252525Y - Control circuit of electric tool switch

Info

Publication number: CN201252525Y
Application number: CNU2008201350021U
Authority: CN
Inventors: 储云跃
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-26
Filing date: 2008-08-26
Publication date: 2009-06-03
Anticipated expiration: 2018-08-26

Abstract

The utility model relates to a control circuit of an electric tool switch, which aims to improve the service life and have the speed control function. The control circuit of the electric tool switch comprises a power supply switch, an unidirectional controllable silicon, a bidirectional trigger diode, an actiyator and a motor, wherein the control electrode of the unidirectional controllable silicon is connected with one end of the bidirectional trigger diode, the actiyator is arranged between the other end of the bidirectional trigger diode and the anode of the unidirectional controllable silicon, and the cathode of the unidirectional controllable silicon is connected with the live wire terminal of the motor; the power supply switch comprises a first wafer and a second wafer, the first wafer is used for forming a control loop by the actiyator, the unidirectional controllable silicon and the bidirectional trigger diode, and the second wafer is used for the short circuit of the control loop.

Description

The control circuit of electric tool switch

Technical field

The utility model relates to a kind of control circuit of electric tool switch.

Background technology

Existing electric tool speed-regulating switch has many types, but speed-regulating switch overall volume compare big more, and what the local nature of handgrip will be done when being contained on the instrument is bigger, is inconvenient to use.And the little switch of volume does not possess speed-regulating function, or can not satisfy the instructions for use of more powerful instrument.When the bigger use power of needs, existing speed-regulating switch will additionally install speed regulating device additional, particularly for instruments such as electric hammer, cutting machines, when electric motor starting in order to make it have the function of slow startup, to install soft starting device additional to instrument, this scheme had both increased cost, and when manipulating many operating procedures.Simultaneously, since the qualification of some handling position size, the extra means of can't packing into.Existing speed-regulating switch uses the one-way SCR of small size encapsulation (SMD), when having big electric current to pass through, the one-way SCR heating is very big, because of himself heat-sinking capability smaller, and additional heating panel is little because of the indoor design volume, radiating effect is also bad, causes to be easy to puncture, thereby causes its damage.

In addition, existing electric tool speed-regulating switch is not because the unreasonable switch that makes of project organization is all to adopt alloy contact to realize in connection and disjunction, but with the mode of slip contact, more weak on the ability of resisting connection disjunction spark, it is obstructed or constantly manifest switch often to occur, and influence is used and safety.

The utility model content

It is long and have a control circuit of the electric tool switch of speed-regulating function that the technical problems to be solved in the utility model provides a kind of safe and reliable, useful life.

In order to solve the problems of the technologies described above, the utility model provides a kind of control circuit of electric tool switch, comprising: mains switch, one-way SCR, bidirectional trigger diode, speed-regulating control circuit and motor; The control utmost point of one-way SCR connects an end of bidirectional trigger diode, and speed-regulating control circuit is located between the anode of the other end of bidirectional trigger diode and one-way SCR, and the negative electrode of one-way SCR connects the hot terminal of motor; Mains switch comprises: the second wafer that is used to make the first contact formula of speed-regulating control circuit, one-way SCR and bidirectional trigger diode formation control loop and is used to make described control loop short circuit.

Technique scheme of the present utility model has the following advantages compared to existing technology: the control circuit of (1) electric tool switch of the present utility model, switch governor function and straight-through function are to carry out along separate routes, after wherein arbitrary path opened circuit damage, switch still can operate as normal.The one-way SCR of large scale encapsulation has great high-temperature resistant, and larger area speed governing sheet is used for the heat radiation and the heat accumulation of one-way SCR simultaneously, effectively distributes the heat that one-way SCR produces when working long hours, reduction body temperature.Increase the reliability of speed adjusting performance.Speed governing and direct circuit carry out along separate routes, can guarantee one the tunnel disconnect after, another road can operate as normal, prolongs switch useful life.The connection of speed governing and direct circuit and disjunction all have the contact on the contact chip to finish, because the particularity of material, has the anti-arc ability of arc extinguishing, reduce damage, useful life is more of a specified duration, and fulcrum adopts metal material, more wear-resistant, guarantee contact pressure, reduce the contact heating, reduce the thermal deformation of electric arc and pedestal.

Description of drawings

For the easier quilt of content of the present utility model is clearly understood, below the specific embodiment and in conjunction with the accompanying drawings of basis, the utility model is described in further detail, wherein

Fig. 1 is the decomposition texture schematic diagram of the control circuit of electric tool switch of the present utility model;

Fig. 2 is another decomposition texture schematic diagram of the control circuit of electric tool switch of the present utility model;

Fig. 3 is the third decomposition texture schematic diagram of the control circuit of electric tool switch of the present utility model;

Fig. 4 is the circuit theory diagrams of the control circuit of electric tool switch of the present utility model.

Embodiment

(embodiment 1)

See Fig. 1-4, the control circuit of the electric tool switch of present embodiment, mains switch K, one-way SCR D1, bidirectional trigger diode DB, speed-regulating control circuit, motor M, voltage-stabiliser tube D2, anti-interference capacitor C2 and be located at the filter capacitor C1 of motor M power end.

The control utmost point of one-way SCR D1 connects the end of bidirectional trigger diode DB, and speed-regulating control circuit is located between the anode of the other end of bidirectional trigger diode DB and one-way SCR D1, and the negative electrode of one-way SCR D1 connects the hot terminal of motor M; Mains switch K comprises: the second wafer 11 that is used to make the first contact formula 3 of speed-regulating control circuit, one-way SCR D1 and bidirectional trigger diode DB formation control loop and is used to make described control loop short circuit.Be located at after described voltage-stabiliser tube D2 and the anti-interference capacitor C2 parallel connection between the negative electrode and bidirectional trigger diode DB of one-way SCR D1.

Described speed-regulating control circuit comprises: first resistance R 1, second resistance R 2 and the potentiometer circuit; Be located between the anode and bidirectional trigger diode DB of one-way SCR D1 after first resistance R, 1 serial, second resistance R 2, potentiometer circuit is in parallel with first resistance R 1 or second resistance R 2.

Described potentiometer circuit comprises resistance R 3, R4, R5, R6, R7 and the R8 of series connection successively.

(application examples 1)

The electric tool switch of using the control circuit of the foregoing description has: pedestal 18, and pedestal 18 tops are provided with slide bar 1; Both sides, pedestal 18 top are provided with first contact 3 and the second wafer 11 that is electrically connected; Slide bar 1 is provided with first fulcrum 2 and second fulcrum 10, and before the position of second fulcrum 10 in first fulcrum 2; First fulcrum 2, second fulcrum 10, first contact 3 and the second wafer 11 constitute the seesaw type switch controlling organization.

The front end of first contact 3 and the second wafer 11 all is provided with the contact, and its below is respectively equipped with straight-through sheet 6 and speed governing sheet 12; First binding post 5 that also is provided with second binding post 9 on the pedestal 18 and is electrically connected with first contact 3, straight-through sheet 6 is electrically connected with second binding post 9.

Also be provided with the one-way SCR 13 of circuit board 17 and big encapsulation on the pedestal 18, speed governing sheet 12 links to each other with the anode of one-way SCR 13, and the negative electrode of one-way SCR 13 links to each other with straight-through sheet 6, and the control utmost point of one-way SCR 13 links to each other with the control output end of circuit board 17.

Circuit board 17 is provided with the control circuit of the foregoing description, and a side of slide bar 1 is connected with fixed mount 15, the fixed mount 15 inboard fixedly connected elastic contact blades 16 that are useful on the described control circuit of control.

See Fig. 1 and 4, described elastic contact blade 16 comprises be connected with each other and be arranged in parallel a pair of, posts the strip contact chip 8 relative with described a pair of elastic contact blade 16 on the described circuit board 17, this strip contact chip 8 and elastic contact blade 16 Elastic Contact.

Described pedestal 18 is arranged in the housing 18-1, and housing 18-1 top is provided with the spacing housing 1-1 that is used for spacing slide bar 1.

Also be provided with a pair of a pair of steel disc 7 and 14 that is used to connect anti-interference capacitor C2 on the described pedestal 18.

Described one-way SCR 13 has fin, and this fin is riveted or is welded on the described speed governing sheet 12.Also be provided with support chip 4 on the described pedestal 18, support chip 4 has a pair of top, respectively with the central portion interlock of first contact 3 and the second wafer 11, promptly connects all the time; First binding post 5 is electrically connected with first contact 3 respectively through support chip 4.

Elastic contact chip 16 slides on circuit board 17, to change the internal control signal of one-way SCR 13.First binding post 5 is the live wire input terminal, and second binding post 9 is the live wire outlet terminal.First binding post 5 is connected with the live wire of city's alternating current, and second binding post 9 is connected with the live wire input terminal of motor, and steel disc 7 and 14 is used to connect anti-interference capacitor C2.

The 220 big encapsulation one-way SCRs that encapsulate of one-way SCR 13 for having heat radiating fins, the bigger speed governing sheet 12 of area is as connecting the speed governing sheet, simultaneously also as the fin of one-way SCR 13, store and distribute the heat that it produces when work, the fin of speed governing sheet 12 and one-way SCR 13 is riveted or is welded together.Support chip 4 is riveted mutually or is welded with first binding post 5, and straight-through sheet 6 is riveted mutually or welded with second binding post 9.

The pass is when nature, and first contact 3 and the second wafer 11 disconnect with straight-through sheet 6 and speed governing sheet 12 respectively, and this moment, switch did not have output signal, did not have electric current to pass through yet.

When with slow with one's hands pressure slide bar 1, slide bar 1 moves inward, drive fixed mount 15 and on elastic contact chip 16 on circuit board 17, slide, drive first fulcrum 2 simultaneously and second fulcrum 10 moves, in first fulcrum 2 and second fulcrum 10 spring is housed, it is pressed on first contact 3 and the second wafer 11 all the time, because the position of second fulcrum 10 is forward than the position of first fulcrum 2, thereby first contact 3 is communicated with speed governing sheet 12 under the effect of second fulcrum 10 after slide bar 1 was pressed certain distance, this moment, electric current was delivered to support chip 4 by first binding post 5, be delivered to the second wafer 11 again, be delivered to speed governing sheet 12 by the contact on it, pass to one-way SCR 13 by speed governing sheet 12 again, one-way SCR 13 is under the effect of control circuit, current delivery to straight-through sheet 6, is delivered to second binding post 9 again, power supply is provided to motor M.Provide less during beginning to the electric current of motor M, along with slide bar 1 continue be pressed into, described electric current also strengthens thereupon, when distance that slide bar 1 is pressed into after to a certain degree, first contact 3 is connected with straight-through sheet 6 under the effect of second fulcrum 10, electric current is then directly exported through support chip 4, the first seesaw sheet 3, straight-through sheet 6 and second binding post 9 by first binding post 5, and one-way SCR 13 is no longer worked.

In hand slide bar 1, if slowly press, what then the control circuit of electric tool switch of the present utility model showed is a speed-regulating switch, and what then show when hand very fast is a single speed switch that soft start function is arranged; When hand is that then performance is a single speed switch especially soon.

Obviously, the foregoing description only is for the utility model example clearly is described, and is not to be qualification to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection range of the present utility model.

Claims

1, a kind of control circuit of electric tool switch is characterized in that comprising: mains switch (K), one-way SCR (D1), bidirectional trigger diode (DB), speed-regulating control circuit and motor (M);

The control utmost point of one-way SCR (D1) connects an end of bidirectional trigger diode (DB), speed-regulating control circuit is located between the anode of the other end of bidirectional trigger diode (DB) and one-way SCR (D1), and the negative electrode of one-way SCR (D1) connects the hot terminal of motor (M);

Mains switch (K) comprising: the second wafer (11) that is used to make the first contact formula (3) of speed-regulating control circuit, one-way SCR (D1) and bidirectional trigger diode (DB) formation control loop and is used to make described control loop short circuit.

2, the control circuit of electric tool switch according to claim 1 is characterized in that: also comprise voltage-stabiliser tube (D2) and anti-interference capacitor (C2); Be located at after described voltage-stabiliser tube (D2) and anti-interference capacitor (C2) parallel connection between the negative electrode and bidirectional trigger diode (DB) of one-way SCR (D1).

3, the control circuit of electric tool switch according to claim 2 is characterized in that: described speed-regulating control circuit comprises: first resistance (R1), second resistance (R2) and potentiometer circuit;

Be located at behind first resistance (R1) serial second resistance (R2) between the anode and bidirectional trigger diode (DB) of one-way SCR (D1), potentiometer circuit is in parallel with first resistance (R1) or second resistance (R2).