CN109361205A - A kind of power-down protection circuit and electric tool - Google Patents
A kind of power-down protection circuit and electric tool Download PDFInfo
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- CN109361205A CN109361205A CN201811502926.5A CN201811502926A CN109361205A CN 109361205 A CN109361205 A CN 109361205A CN 201811502926 A CN201811502926 A CN 201811502926A CN 109361205 A CN109361205 A CN 109361205A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
Abstract
The present invention relates to switching technique field, a kind of power-down protection circuit and electric tool are provided.Power-down protection circuit includes hand switch, the first charge-discharge circuit, the second charge-discharge circuit, switching tube circuit and driving circuit；Hand switchs between the first charge-discharge circuit and the second charge-discharge circuit, and the first charge-discharge circuit exports the first level signal, and the second charge-discharge circuit exports second electrical level signal, and hand switch includes open state and off state；Switching tube circuit is connect with the second charge-discharge circuit and driving circuit, when sending a telegram here again after hand switchs middle power failure in the open state, first charge-discharge circuit starts to charge until fully charged, first level signal is coupled to the second charge-discharge circuit, second electrical level signal is equal to the first level signal, and switching tube circuit is used for according to second electrical level signal, output drive signal, driving circuit is used to keep load to close according to driving signal.The present invention realizes safe and reliable power down protection.
Description
[technical field]
The present invention relates to switching circuit technical field more particularly to a kind of power-down protection circuits and electric tool.
[background technique]
Electric tool is broadly divided into metal cutting electric tool, grinds electric tool, assembling electric tool and railway power supply
Power driven tools, common electric tool have electric drill, electric grinder, electric wrench and electric screw driver, electric hammer, electric impact drill, mix
Solidifying soil vibration device and electric planer etc., electric tool have high revolving speed, existing some potential safety problems due to it at work.
If electric tool uses automatic reset switch, but operator is needed for a long time in use according to not square
Just it uses, if electric tool uses touch switch, is easy to accidentally touch, causes to accidentally touch or cause safety accident.Currently, electric
Power driven tools generally use ship type switch or toggle switch, manually open after need to be turned off manually, do not use temporarily either or
Using finishing it is intended to that mainly the signaling switch of electric tool is turned off manually.After electric tool has a power failure, when operator's major part
It is easy to forget to close the switch manual of electric tool, it is electronic since switch does not set pass when sending a telegram here again after electric tool power failure
Instrument start-up may cause safety accident.
[summary of the invention]
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of safe and reliable power-down protection circuits and electricity
Power driven tools.
In order to solve the above technical problems, the embodiment of the present invention the following technical schemes are provided:
The embodiment of the invention provides a kind of power-down protection circuits, including hand switch, the first charge-discharge circuit, second
Charge-discharge circuit, switching tube circuit and driving circuit；
The hand switch is between first charge-discharge circuit and second charge-discharge circuit, and described first
Charge-discharge circuit exports the first level signal, and second charge-discharge circuit exports second electrical level signal, the hand switch
Including open state and off state, the hand switch is for gating first charge and discharge when in the open state
Circuit gates second charge-discharge circuit when in an off state；
The switching tube circuit is connect with second charge-discharge circuit and the driving circuit, when the hand switchs
When middle power failure in the open state, first charge-discharge circuit carries out electric discharge up to the electricity at first charge-discharge circuit both ends
Pressure is 0, and load is closed, when sending a telegram here again after the hand switchs middle power failure in the open state, the first charge and discharge electricity
Road starts to charge until fully charged, and first level signal is coupled to second charge-discharge circuit, the second electrical level letter
Number be equal to first level signal, the switching tube circuit be used for according to second electrical level signal, output drive signal, the drive
Dynamic circuit is used to keep the load to close according to the driving signal.
Optionally, the power-down protection circuit further includes feed circuit, the feed circuit and second charge and discharge electricity
Road, the switching tube circuit are connected with the driving circuit, and the feed circuit is used to make described open according to the driving signal
It closes pipe circuit and maintains conducting.
Optionally, the switching tube circuit includes first switch tube circuit and second switch circuit；
The first switch tube circuit respectively with second charge-discharge circuit, the second switch circuit and described anti-
Current feed circuit connection；
The second switch circuit is also connect with the driving circuit and the feed circuit.
Optionally, the power-down protection circuit further includes rectification circuit, bleeder circuit, filter circuit and voltage regulator circuit；
The rectification circuit is connect with power input and power output end respectively；
The bleeder circuit is connect with the rectification circuit；
The filter circuit is connect with the bleeder circuit；
The voltage regulator circuit respectively with the filter circuit, first charge-discharge circuit and the second switch circuit
Connection.
Optionally, first charge-discharge circuit includes first resistor, first capacitor and second resistance；
One end of the first resistor is connect with the voltage regulator circuit, and the other end of the first resistor is respectively with described
One end of one capacitor and the hand switch on end connection；
The other end of the first capacitor is connect with ground terminal；
The common end that one end of the second resistance is switched with second charge-discharge circuit and the hand respectively connects
It connects, the other end of the second resistance is connect with the ground terminal；
Second charge-discharge circuit includes 3rd resistor and the second capacitor；
One end of the 3rd resistor is connect with the shutdown side that the hand switchs, the other end of the 3rd resistor with
One end of second capacitor connects；
The common end that the other end of second capacitor is switched with one end of the second resistance and the hand respectively
Connection.
Optionally, the first switch tube circuit includes the first metal-oxide-semiconductor and diode；
The grid of first metal-oxide-semiconductor respectively with the cathode of the diode, one end of second capacitor and described
The other end of three resistance connects, the drain electrode of first metal-oxide-semiconductor and the second switch circuit connection, first metal-oxide-semiconductor
Source electrode connect with the ground terminal；
The anode of the diode is connect with the ground terminal；
The second switch circuit includes the second metal-oxide-semiconductor, the 4th resistance and the 5th resistance；
The grid of second metal-oxide-semiconductor is connect with one end of one end of the 4th resistance and the 5th resistance respectively,
The drain electrode of second metal-oxide-semiconductor is connect with the driving circuit and the feed circuit respectively, the source electrode of second metal-oxide-semiconductor with
The other end of 4th resistance connects；
The other end of 5th resistance is connect with the drain electrode of first metal-oxide-semiconductor.
Optionally, the feed circuit includes the 6th resistance and the 7th resistance；
One end of 6th resistance is connect with the drain electrode of second metal-oxide-semiconductor and the driving circuit respectively, and described
The other end of six resistance respectively with one end of the 7th resistance, the grid of first metal-oxide-semiconductor, the cathode of the diode and
One end of second capacitor connects；
The other end of 7th resistance is connect with the ground terminal respectively.
Optionally, the driving circuit includes the 8th resistance and bidirectional triode thyristor；
One end of 8th resistance is connect with one end of the drain electrode of second metal-oxide-semiconductor and the 6th resistance respectively,
The other end of 8th resistance is connect with the control electrode of the bidirectional triode thyristor；
The bidirectional triode thyristor anode with the power output end anode connect, the cathode of the bidirectional triode thyristor and
The ground terminal connection.
Optionally, the driving circuit includes relay or optocoupler.
The embodiment of the invention also provides a kind of electric tools, including power-down protection circuit as described above.
The beneficial effects of the present invention are: compared with prior art, the embodiment of the invention provides a kind of power down protection electricity
Road and electric tool.The power-down protection circuit by the first charge-discharge circuit it is non-security power on (i.e. hand switch be in
Send a telegram here again after having a power failure in open state) in the case where fully charged level signal be unsatisfactory for the turn-on condition of switching tube circuit,
So that the driving circuit can not be driven loaded work piece according to the driving signal of switching tube circuit output, so that powering on non-security
In the case of, load remains turned-off.Therefore, the present invention realizes in the case where non-security power on, and electric tool exits opening state
State protects the safety of user.
[Detailed description of the invention]
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is a kind of structural schematic diagram of electric tool provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of power-down protection circuit provided in an embodiment of the present invention；
Fig. 3 be another embodiment of the present invention provides a kind of power-down protection circuit structural schematic diagram；
Fig. 4 is a kind of structural schematic diagram of switching tube circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of circuit connection diagram of power-down protection circuit provided in an embodiment of the present invention.
[specific embodiment]
The application in order to facilitate understanding with reference to the accompanying drawings and detailed description carries out in more detail the application
It is bright.It should be noted that it can be directly to another yuan when an element is expressed " connection " another element
Part or elements placed in the middle there may be one or more therebetween.In addition, term " first ", " second " etc. are only used for description mesh
, it is not understood to indicate or imply relative importance.
Unless otherwise defined, technical and scientific term all used in this specification is led with technology of the invention is belonged to
The normally understood meaning of the technical staff in domain is identical.It is specific to be intended merely to description for used term in the description of the invention
Embodiment purpose, be not intended to limitation the present invention.Term "and/or" used in this specification includes one or more
Any and all combinations of relevant listed item.In addition, involved in the application difference embodiment disclosed below
Technical characteristic can be combined with each other as long as they do not conflict with each other.
It should be noted that the input terminal that " IN " and " IN1 " in attached drawing is represented, what " OUT " and " OUT1 " was represented be with
Load the output end of connection." AC input " in Fig. 4 refers to ac input end, and " AC output " refers to exchange output
End.Fig. 1 to Fig. 3 only logically indicates the connection relationship between each module, does not represent the connection framework of circuit itself, also not generation
The actual wire structures of watch circuit.
Referring to Fig. 1, Fig. 1 is a kind of structural schematic diagram of electric tool provided in an embodiment of the present invention.As shown in Figure 1,
The electric tool 200 includes shell (not shown) and the power-down protection circuit 100 being located in the shell.The electronic work
Tool 200 is broadly divided into metal cutting electric tool, grinds electric tool, assembling electric tool and railway power supply power driven tools, described
Electric tool 200 includes but is not limited to electric drill, electric grinder, electric wrench and electric screw driver, electric hammer, electric impact drill, mixes
Solidifying soil vibration device and electric planer etc..
The electric tool 200 can drive different machines according to type, the different power etc. of the motor built in it
The operating of tool component.Generally, the electric tool 200 has Alternating Current Power Supply and direct current supply two ways, when the electric tool
200 by the way of Alternating Current Power Supply when comprising the power supply line being connect with AC socket, when in use, first by the electric tool
200 power supply line is connect with AC socket, is provided AC power source for the electric tool 200, is and then opened the electric tool
200 switch completes the opening process of the electric tool 200.When the electric tool 200 is by the way of direct current supply
When, the switch of the electric tool 200 is directly opened, DC source is provided for the electric tool 200, completes the electric tool
200 opening process, conversely, completing the turn off process of the electric tool 200.
Referring to Fig. 2, Fig. 2 is a kind of structural schematic diagram of power-down protection circuit provided in an embodiment of the present invention.Such as Fig. 2 institute
Show, the power-down protection circuit 100 includes hand switch 10, the first charge-discharge circuit 20, the second charge-discharge circuit 30, switch
Pipe circuit 40, driving circuit 50 and feed circuit 60.In the present embodiment, the power-down protection circuit 100 is mainly used for working as institute
Stating situations such as electric tool 200 meets with bad power failure, Plug contact, fault in use leads to power down, stops work
When making, and closing the switch on the electric tool 200 not in time, restore the case where powering on again in the electric tool 200
Under, it may cause dangerous situation.
The hand switch 10 is between first charge-discharge circuit 20 and second charge-discharge circuit 30, institute
It states the first charge-discharge circuit 20 and exports the first level signal, second charge-discharge circuit 30 exports second electrical level signal.It is described
Hand switch 10 includes open state and off state, and the hand switch 10 is used for when in the open state, gating
First charge-discharge circuit 20 gates second charge-discharge circuit 30 when in an off state.In the present embodiment,
The hand switch 10 is signaling switch, and in some embodiments, the hand switch 10 can also switch for forceful electric power.Please
Together refering to Fig. 5, the hand switch 10 includes hand switch S1, and the hand switch S1 includes opening end " 1 ", public affairs
End " 2 " and shutdown side " 3 " altogether.
Further, the hand switch 10 is installed on the shell of the electric tool 200, for user's operation,
In the present embodiment, the hand switch 10 includes ship type switch or toggle switch, and user presses or stir described manual
Pass can be set open or be set to the electric tool 200 by formula switch 10.In some embodiments, it is set on the hand switch 10
It is equipped with a safety cover plate, the safety cover plate can be spun upside down around a certain rotary shaft, or can surround a certain track water
Translation is dynamic or moves up and down, and the safety cover plate is used for water proof and dust proof, promotes the service life of the hand switch 10, together
When, it can also prevent due to accidentally touching caused maloperation.
First charge-discharge circuit 20 includes first resistor R7, first capacitor C3 and second resistance R9.Wherein, described
One end of one resistance R7 is connect with the voltage regulator circuit 110 (as shown in Figure 3), the other end of the first resistor R7 respectively with institute
The one end for stating first capacitor C3 is connected with the opening end of the hand switch S1.The other end and ground terminal of the first capacitor C3
Connection.One end of second resistance R9 common end with second charge-discharge circuit 30 and the hand switch S1 respectively
Connection, the other end of the second resistance R9 are connect with the ground terminal.
When the 10 middle power failure in the open state of hand switch, first charge-discharge circuit 20 discharge straight
Voltage to 20 both ends of the first charge-discharge circuit is 0, and load is closed.It is appreciated that in first charge-discharge circuit 20
During electric discharge, when undertension is to maintain 40 circuit of switching tube to be connected, load is closed.When the hand switchs
When sending a telegram here again after 10 middle power failures in the open state, first charge-discharge circuit 20 is started to charge until fully charged, and described the
One level signal is coupled to second charge-discharge circuit 30, and the second electrical level signal is equal to first level signal, institute
Switching tube circuit 40 is stated according to second electrical level signal, output drive signal, the driving circuit 50 is according to the driving signal, guarantor
The load is held to close.So when sending a telegram here again after the hand switch 10 middle power failure in the open state, protection rear class electricity
Open state is exited on road, and load is not worked on power at once due to incoming call, avoids the generation of safety accident.Wherein, when the hand
When moving type switch middle power failure in the open state, first level signal is equal to the first resistor R7 and R9 pairs of second resistance
The partial pressure of supply voltage after 110 pressure stabilizing of voltage regulator circuit, due to the second electrical level signal by the second capacitor C1 with
The first level signal connection, so, the second electrical level signal is also equal to the first resistor R7 and R9 pairs of second resistance
The partial pressure of supply voltage after 110 pressure stabilizing of voltage regulator circuit.
Second charge-discharge circuit 30 includes 3rd resistor R4 and the second capacitor C1.In the present embodiment, the third electricity
One end of resistance R4 is connect with the shutdown side of the hand switch S1, the other end of the 3rd resistor R4 and second capacitor
One end of C1 connects.The other end of the second capacitor C1 is switched with one end of the second resistance R9 and the hand respectively
The common end of S1 connects.
The switching tube circuit 40 is connect with second charge-discharge circuit 30 and the driving circuit 50, the switching tube
Circuit is according to second electrical level signal, output drive signal.The switching tube circuit 40 is used to be in when the hand switch 10
When working normally in open state, implement conducting, when hand switch 10 switches to off state by open state, implements to close
It closes.It is appreciated that the switching tube circuit 40 is connected when the 10 middle normal work in the open state of hand switch,
Output drive signal is high level signal, when hand switch 10 switches to off state by open state, the switching tube
Circuit 40 is implemented to close, and output drive signal is low level signal.
Referring to Fig. 4, the switching tube circuit 40 includes first switch tube circuit 401 and second switch circuit 402.
The first switch tube circuit 401 respectively with second charge-discharge circuit 30, the second switch circuit 402
It is connected with the feed circuit 60.
In the present embodiment, the first switch tube circuit 401 includes the first metal-oxide-semiconductor Q2 and diode D2.Described first
The grid of metal-oxide-semiconductor Q2 respectively with the cathode of the diode D2, one end of the second capacitor C1 and the 3rd resistor R4
Other end connection, the drain electrode of the first metal-oxide-semiconductor Q2 are connect with the second switch circuit 30, the first metal-oxide-semiconductor Q2's
Source electrode is connect with the ground terminal.The anode of the diode D2 is connect with the ground terminal.
It is appreciated that the diode D2 is equivalent to voltage-stabiliser tube, for when steady by voltage regulator circuit 110 (as shown in Figure 3)
Supply voltage after pressure is higher than the V of the first metal-oxide-semiconductor Q2GSLimited amplitude protection when, protection the first metal-oxide-semiconductor Q2 be not damaged, if
Supply voltage is smaller, and fluctuating range is smaller, and the diode D2 can be omitted.
The second switch circuit 402 is also connect with the driving circuit 50 and the feed circuit 60.
Wherein, the second switch circuit 402 includes the second metal-oxide-semiconductor Q1, the 4th resistance R3 and the 5th resistance R5.It is described
The grid of second metal-oxide-semiconductor Q1 is connect with one end of one end of the 4th resistance R3 and the 5th resistance R5 respectively, and described
The drain electrode of two metal-oxide-semiconductor Q1 is connect with the driving circuit 50 and the feed circuit 60 respectively, the source electrode of the second metal-oxide-semiconductor Q1
It is connect with the other end of the 4th resistance R3.The drain electrode of the other end of the 5th resistance R5 and the first metal-oxide-semiconductor Q2 connect
It connects.
The driving circuit 50 is used for according to the driving signal, on and off load.The driving circuit 50 includes
8th resistance R2 and bidirectional triode thyristor SCR1.
In the present embodiment, one end of the 8th resistance R2 respectively with the drain electrode of the second metal-oxide-semiconductor Q1 and described
One end of six resistance R6 connects, and the other end of the 8th resistance R2 is connect with the control electrode of the bidirectional triode thyristor SCR1.Institute
The anode for stating bidirectional triode thyristor SCR1 is connect with the anode of the power output end, the cathode of the bidirectional triode thyristor SCR1 and institute
State ground terminal connection.In some embodiments, the driving circuit 50 includes relay or optocoupler, is substituted using relay or optocoupler
The control mode of bidirectional triode thyristor.
The feed circuit 60 and second charge-discharge circuit 30, the switching tube circuit 40 and the driving circuit 50
Connection, the feed circuit 60 are used to make the switching tube circuit 40 maintain conducting according to the driving signal.
In the present embodiment, the feed circuit 60 includes the 6th resistance R6 and the 7th resistance R10.The 6th resistance R6
One end connect respectively with the drain electrode of the second metal-oxide-semiconductor Q1 and the driving circuit 50, the other end of the 6th resistance R6
Respectively with one end of the 7th resistance R10, the grid of the first metal-oxide-semiconductor Q2, the cathode of the diode D2 and described
One end of two capacitor C1 connects.The other end of the 7th resistance R10 is connect with the ground terminal respectively.
It should be noted that the resistance value of the second resistance R9 should be less than the resistance value of the 7th resistance R10, when manual
Formula switch S1 is placed in the moment of opening end " OFF " endpoint, and the voltage on the second capacitor C1 cannot be mutated, the second capacitor C1 two
The voltage at end is identical, can be considered as short circuit, is equal to the grid voltage of the first metal-oxide-semiconductor Q2, at this point, second resistance R9, the 7th electricity
Hinder grid voltage of R10 and the 6th resistance R6 partial pressure as the first metal-oxide-semiconductor Q2.The resistance value of second resistance R9 is less than the 7th resistance
The resistance value of R10 can quickly reduce the grid voltage of the first metal-oxide-semiconductor Q2, so that the first metal-oxide-semiconductor Q2 ends.So second resistance
The response speed of hand switch S1 can be improved less than the resistance value of the 7th resistance R10 for the resistance value of R9, and then promote the body of user
It tests.
Referring to Fig. 3, the power-down protection circuit 100 further includes rectification circuit 70, bleeder circuit 80,90 and of filter circuit
Voltage regulator circuit 110.
The rectification circuit 70 is connect with power input and power output end respectively, as shown in figure 5, the rectification circuit
70 anodes including the second diode D1, the second diode D1 are connected with power input with power output end, and described the
The cathode of two diode D1 is connect with the bleeder circuit 80.
The bleeder circuit 80 is connect with the rectification circuit 70.In the present embodiment, the bleeder circuit 80 includes the
Eight resistance R1 and the 9th resistance R8, one end of the 8th resistance R1 are connect with the cathode of the second diode D1, and described
The other end of eight resistance R1 is connect with one end of the 9th resistance R8 and the filter circuit 90.The 9th resistance R8's is another
One end is connect with the ground terminal, wherein the ground terminal is the ground terminal at the power input (i.e. the end AC input).
The filter circuit 90 is connect with the bleeder circuit 80, wherein and the filter circuit 90 includes third capacitor C2,
The anode of the third capacitor C2 is connect with one end of the 9th resistance R8 and the voltage regulator circuit 110, the third capacitor
The cathode of C2 is connect with the ground terminal.
The voltage regulator circuit 110 is opened with the filter circuit 90, first charge-discharge circuit 20 and described second respectively
Pipe circuit 402 is closed to connect.In the present embodiment, the voltage regulator circuit 110 includes voltage-stabiliser tube Z1, and the voltage-stabiliser tube Z1 is connected in parallel on institute
State the both ends of power input.
To sum up, the power-down protection circuit 100 includes opening process under normal circumstances, turn off process, in open state
Have a power failure the process sent a telegram here again in the process and open state of power failure.
When the power-down protection circuit 100 is in opening process under normal circumstances, i.e., the described hand switch 10 is in
Open state.The power input provides AC power source, by the rectification of the second diode D1, the electricity of the 8th resistance R1 and the 9th
The partial pressure of R8 is hindered, the filtering of third capacitor C2 and the pressure stabilization function of voltage-stabiliser tube Z1 obtain the work of the power-down protection circuit 100
Make voltage, the operating voltage by first resistor R7 to first capacitor C3 charge, until first capacitor C3 be equal to operating voltage, i.e.,
The first level signal that first charge-discharge circuit 20 exports is equal to operating voltage.
When hand switch S1 is placed in open state, i.e., hand switch S1 shown in fig. 5 be placed in opening end " ON " or
" 1 " endpoint, the voltage on first capacitor C3 is coupled to the grid of the first metal-oxide-semiconductor Q2 by the second capacitor C1, at this point, described second
The second electrical level signal that charge-discharge circuit 30 exports is equal to the first level signal, i.e., the described second electrical level signal is equal to described first
Level signal is equal to operating voltage, meets the turn-on condition of the first metal-oxide-semiconductor Q2, the first metal-oxide-semiconductor Q2 conducting.Due to the first metal-oxide-semiconductor
Q2 conducting, the drain voltage of the first metal-oxide-semiconductor Q2 are pulled to ground, meet the turn-on condition of the second metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor
Q1 conducting.
After the second metal-oxide-semiconductor Q1 conducting, operating voltage is reached two-way controllable by the second metal-oxide-semiconductor Q1 and the 8th resistance R2
The control electrode of silicon SCR1, the bidirectional triode thyristor SCR1 conducting, accesses the power output end, the loaded work piece.
As first capacitor C3 is discharged by second resistance R9, start to discharge after the second capacitor C1 is fully charged, i.e. institute
Second electrical level signal is stated to start to be gradually reduced, so, the voltage that provides of grid that the second capacitor C1 is the first metal-oxide-semiconductor Q2 is under
Drop, the turn-on condition until being insufficient for the first metal-oxide-semiconductor Q2.But output services voltage when the second metal-oxide-semiconductor Q1 conducting, i.e.,
Drain voltage of the source voltage of second metal-oxide-semiconductor Q1 equal to the second metal-oxide-semiconductor Q1 is equal to operating voltage, the electricity of the 6th resistance R6 and the 7th
Resistance R10 divides operating voltage, provides grid voltage for the first metal-oxide-semiconductor Q2, maintains the first metal-oxide-semiconductor Q2 and second
Metal-oxide-semiconductor Q1 conducting.
When the power-down protection circuit 100 is in turn off process under normal circumstances, i.e., the described hand switch 10 is in
Off state.When hand switch S1 is switched to off state by open state, i.e., hand switch S1 shown in fig. 5 is by opening
End " ON " endpoint is switched to shutdown side " OFF " or " 3 " endpoint.Second capacitor C1 discharges by 3rd resistor R4, the first metal-oxide-semiconductor Q2
Grid low potential is pulled down to by 3rd resistor R4 and second resistance R9, i.e., the described second electrical level signal be low level signal,
It is not enough to be connected the first metal-oxide-semiconductor Q2, so that the first metal-oxide-semiconductor Q2 ends.Since the first metal-oxide-semiconductor Q2 ends, the second metal-oxide-semiconductor Q1
Cut-off, the bidirectional triode thyristor SCR1 cut-off, the power output end are closed, and the load does not work.
As the process of the power-down protection circuit 100 middle power failure in the open state, i.e., hand switch S1 shown in fig. 5
In opening end " ON " endpoint, power supply is lost.First capacitor C3 is discharged by second resistance R9, until first capacitor
The voltage at the both ends C3 is 0, i.e., described first level signal is equal to 0, and the load is closed.
When the power-down protection circuit 100 middle process sent a telegram here again that has a power failure in the open state, i.e., hand shown in fig. 5
Switch S1 is in opening end " ON " endpoint, restores electricity again.Restore the moment powered on, the voltage at the both ends first capacitor C3 cannot
Mutation, increases with the increase in charging time, still, again extensive since hand switch S1 is in opening end " ON " endpoint
The case where powering again is non-security the case where powering on, and second resistance R9 is accessed in the charge circuit of first capacitor C3, therefore the first electricity
The voltage for holding the both ends C3 can only rise to first resistor R7 and second resistance R9 to the partial pressure of the operating voltage after pressure stabilizing, this
When, first level signal is equal to first resistor R7 and second resistance R9 to the partial pressure of the operating voltage after pressure stabilizing.It is described
First level signal is coupled to second charge-discharge circuit, and the second electrical level signal is equal to first level signal, but
It is that the voltage of the second electrical level signal is significantly less than the conducting voltage of the first metal-oxide-semiconductor Q2, the first metal-oxide-semiconductor Q2 ends, by
Ending in the first metal-oxide-semiconductor Q2, the second metal-oxide-semiconductor Q1 cut-off, the bidirectional triode thyristor SCR1 cut-off, the power output end is closed,
The load remains turned-off, and exits open state.
It should be noted that if being to need to open to reopen the electric tool 200, then need to open the hand
Pass S1 sets pass postposition and opens.
Power-down protection circuit provided in an embodiment of the present invention powers on (i.e. hand non-security by the first charge-discharge circuit
Send a telegram here again after switching middle power failure in the open state) in the case where fully charged level signal be unsatisfactory for leading for switching tube circuit
Gating condition makes driving circuit that can not drive loaded work piece according to the driving signal of switching tube circuit output, so that in non-peace
In the case where powering on entirely, load is remained turned-off.Therefore, the present invention realizes in the case where non-security power on, and electric tool moves back
Open state out protects the safety of user.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；At this
It under the thinking of invention, can also be combined between the technical characteristic in above embodiments or different embodiment, step can be with
It is realized with random order, and there are many other variations of different aspect present invention as described above, for simplicity, they do not have
Have and is provided in details；Although the present invention is described in detail referring to the foregoing embodiments, the ordinary skill people of this field
Member is it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of skill
Art feature is equivalently replaced；And these are modified or replaceed, each reality of the present invention that it does not separate the essence of the corresponding technical solution
Apply the range of a technical solution.
Claims (10)
1. a kind of power-down protection circuit, which is characterized in that including hand switch, the first charge-discharge circuit, the second charge and discharge electricity
Road, switching tube circuit and driving circuit；
The hand switch is between first charge-discharge circuit and second charge-discharge circuit, first charge and discharge
Electric the first level signal of circuit output, second charge-discharge circuit export second electrical level signal, and the hand switch includes
Open state and off state, the hand are switched for gating first charge-discharge circuit when in the open state,
When in an off state, second charge-discharge circuit is gated；
The switching tube circuit is connect with second charge-discharge circuit and the driving circuit, when hand switch is in
When having a power failure in open state, first charge-discharge circuit carries out electric discharge until the voltage at first charge-discharge circuit both ends is
0, load is closed, and when sending a telegram here again after the hand switchs middle power failure in the open state, first charge-discharge circuit is opened
Charging begin until fully charged, first level signal is coupled to second charge-discharge circuit, the second electrical level signal etc.
In first level signal, the switching tube circuit is used for according to second electrical level signal, output drive signal, the driving electricity
Road is used to keep the load to close according to the driving signal.
2. power-down protection circuit according to claim 1, which is characterized in that the power-down protection circuit further includes feedback electricity
Road, the feed circuit are connect with second charge-discharge circuit, the switching tube circuit and the driving circuit, the feedback
Circuit is used to make the switching tube circuit maintain conducting according to the driving signal.
3. power-down protection circuit according to claim 2, which is characterized in that the switching tube circuit includes first switch tube
Circuit and second switch circuit；
The first switch tube circuit is electric with second charge-discharge circuit, the second switch circuit and the feedback respectively
Road connection；
The second switch circuit is also connect with the driving circuit and the feed circuit.
4. power-down protection circuit according to claim 3, which is characterized in that the power-down protection circuit further includes rectified current
Road, bleeder circuit, filter circuit and voltage regulator circuit；
The rectification circuit is connect with power input and power output end respectively；
The bleeder circuit is connect with the rectification circuit；
The filter circuit is connect with the bleeder circuit；
The voltage regulator circuit connects with the filter circuit, first charge-discharge circuit and the second switch circuit respectively
It connects.
5. power-down protection circuit according to claim 4, which is characterized in that first charge-discharge circuit includes the first electricity
Resistance, first capacitor and second resistance；
One end of the first resistor is connect with the voltage regulator circuit, and the other end of the first resistor is electric with described first respectively
One end of appearance and the hand switch on end connection；
The other end of the first capacitor is connect with ground terminal；
The common end that one end of the second resistance is switched with second charge-discharge circuit and the hand respectively is connect, institute
The other end for stating second resistance is connect with the ground terminal；
Second charge-discharge circuit includes 3rd resistor and the second capacitor；
One end of the 3rd resistor is connect with the shutdown side that the hand switchs, the other end of the 3rd resistor with it is described
One end of second capacitor connects；
The common end that the other end of second capacitor is switched with one end of the second resistance and the hand respectively is connect.
6. power-down protection circuit according to claim 5, which is characterized in that the first switch tube circuit includes first
Metal-oxide-semiconductor and diode；
The grid of first metal-oxide-semiconductor is electric with the cathode of the diode, one end of second capacitor and the third respectively
The other end of resistance connects, the drain electrode of first metal-oxide-semiconductor and the second switch circuit connection, the source of first metal-oxide-semiconductor
Pole is connect with the ground terminal；
The anode of the diode is connect with the ground terminal；
The second switch circuit includes the second metal-oxide-semiconductor, the 4th resistance and the 5th resistance；
The grid of second metal-oxide-semiconductor is connect with one end of one end of the 4th resistance and the 5th resistance respectively, described
The drain electrode of second metal-oxide-semiconductor is connect with the driving circuit and the feed circuit respectively, the source electrode of second metal-oxide-semiconductor with it is described
The other end of 4th resistance connects；
The other end of 5th resistance is connect with the drain electrode of first metal-oxide-semiconductor.
7. power-down protection circuit according to claim 6, which is characterized in that the feed circuit includes the 6th resistance and the
Seven resistance；
One end of 6th resistance is connect with the drain electrode of second metal-oxide-semiconductor and the driving circuit respectively, the 6th electricity
The other end of resistance respectively with one end of the 7th resistance, the grid of first metal-oxide-semiconductor, the cathode of the diode and described
One end of second capacitor connects；
The other end of 7th resistance is connect with the ground terminal respectively.
8. power-down protection circuit according to claim 7, which is characterized in that the driving circuit includes the 8th resistance and double
To silicon-controlled；
One end of 8th resistance is connect with one end of the drain electrode of second metal-oxide-semiconductor and the 6th resistance respectively, described
The other end of 8th resistance is connect with the control electrode of the bidirectional triode thyristor；
The anode of the bidirectional triode thyristor is connect with the positive of the power output end, the cathode of the bidirectional triode thyristor with it is described
Ground terminal connection.
9. power-down protection circuit according to claim 1, which is characterized in that the driving circuit includes relay or light
Coupling.
10. a kind of electric tool, which is characterized in that including such as described in any item power-down protection circuits of claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811502926.5A CN109361205B (en) | 2018-12-10 | 2018-12-10 | Power-down protection circuit and electric tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811502926.5A CN109361205B (en) | 2018-12-10 | 2018-12-10 | Power-down protection circuit and electric tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109361205A true CN109361205A (en) | 2019-02-19 |
| CN109361205B CN109361205B (en) | 2023-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811502926.5A Active CN109361205B (en) | 2018-12-10 | 2018-12-10 | Power-down protection circuit and electric tool |
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| Country | Link |
|---|---|
| CN (1) | CN109361205B (en) |
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| CN113676168A (en) * | 2021-07-15 | 2021-11-19 | 深圳拓邦股份有限公司 | Accidental start prevention circuit and electric appliance after power restoration |
| CN115395496A (en) * | 2022-09-06 | 2022-11-25 | 杭州七锐科技有限公司 | Starting safety protection circuit of hard switch electric tool |
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Also Published As
| Publication number | Publication date |
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| CN109361205B (en) | 2023-09-26 |
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