CN109755975A - Electric tool control method and circuit - Google Patents
Electric tool control method and circuit Download PDFInfo
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- CN109755975A CN109755975A CN201711062568.6A CN201711062568A CN109755975A CN 109755975 A CN109755975 A CN 109755975A CN 201711062568 A CN201711062568 A CN 201711062568A CN 109755975 A CN109755975 A CN 109755975A
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- electric tool
- battery pack
- voltage
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Abstract
The present invention relates to a kind of electric tool control method and circuit, this method includes the voltage of battery pack when detecting electric tool booting；Obtain the setting duty ratio that will be exported when electric tool booting；When the voltage of battery pack is less than or equal to voltage threshold, target duty ratio is obtained, and export target duty ratio to motor control switch；When the voltage of battery pack is greater than voltage threshold, the setting duty ratio that will export is to motor control switch when output electric tool booting.Above-mentioned electric tool control method and circuit, battery pack voltage when by detection electric tool booting is to determine whether need to adjust the output duty cycle of battery pack, battery pack voltage when if electric tool is switched on is less than or equal to voltage threshold, that is the remaining capacity of battery pack is less, target duty ratio is exported to motor control switch, to guarantee that electric tool can work when battery pack is in low battery, the remaining capacity of battery pack is taken full advantage of.
Description
Technical field
The present invention relates to field of circuit control, more particularly to a kind of electric tool control method and circuit.
Background technique
Currently, rechargeable battery is widely used in various equipment, such as can be used in electric tool, should
Generally there are multiple rechargeable battery battery cores in a little equipment, each battery battery core is combined to a battery case according to certain rules
In, to form battery pack, battery pack power supply to the device when being coupled together with equipment, once battery pack electricity exhausts, then
It can be charged by charger to the battery pack, greatly facilitate the use of equipment.
But the electricity of battery pack is limited, when battery pack electricity is lower, its output voltage is lower.If mating electricity
The battery pack electricity of power driven tools is lower, and when tool is switched on and the operating condition electric current that is switched on is larger, then battery pack voltage exists direct
It is pulled low to the case where over-discharge electrical voltage point is even more than over-discharge voltage, and triggers under-voltage protection shutdown.The residue electricity of battery pack at this time
Amount is not fully utilized, and when battery pack voltage is pulled low may damage battery.
Summary of the invention
Based on this, it is necessary to provide a kind of electric tool control method and circuit, the surplus of battery pack can be made full use of
Remaining electricity improves single Bao Nengli of battery pack.
A kind of electric tool control method, which comprises
The voltage of battery pack when detecting electric tool booting；
Obtain the setting duty ratio that will be exported when electric tool booting；
When the voltage of the battery pack of detection is less than or equal to preset voltage threshold, then target duty ratio is obtained, and
The target duty ratio is exported to motor control switch；
When the voltage of the battery pack of detection is greater than the preset voltage threshold, then exports the electric tool and open
The setting duty ratio that will be exported when machine is to motor control switch；
The basic information that duty ratio is set to be switched on according to the electric tool when generates.
The basic information includes operation mode information and/or positive and negative rotation pattern information in one of the embodiments,.
Target duty than being no more than duty cycle threshold always in one of the embodiments,；The acquisition target duty ratio
The step of include:
When the setting duty ratio is less than duty cycle threshold, the setting duty ratio is obtained as target duty ratio；
When the setting duty ratio is more than or equal to the duty cycle threshold, obtains the duty cycle threshold and accounted for as target
Empty ratio.
The startup switch of the electric tool includes: the first on-off switch and potentiometer in one of the embodiments,；
The feedback signal of potentiometer output when setting duty ratio to be closed according to first on-off switch is raw
At；
Or
The feedback signal of potentiometer output when setting duty ratio to be closed according to first on-off switch and
The basic information when electric tool is switched on generates.
The startup switch of the electric tool includes: the second on-off switch and speed-regulating switch in one of the embodiments,；
The feedback signal of speed-regulating switch output when setting duty ratio to be closed according to second on-off switch
It generates；
Or
The feedback signal of speed-regulating switch output when setting duty ratio to be closed according to second on-off switch
And basic information when electric tool booting generates.
The speed-regulating switch is multi gear position speed-regulating switch in one of the embodiments,；The feedback signal is according to institute
The gear signal for stating the output of multi gear speed-regulating switch obtains.
The corresponding duty cycle threshold of the different stalls of the multi gear bit switch is different in one of the embodiments,.
The speed-regulating switch is no gear slide switch in one of the embodiments, and the feedback signal is according to institute
The distance that slide switch slides is stated to obtain；
Or
The speed-regulating switch is no gear rotary switch, and the feedback signal is to be revolved according to the no gear rotary switch
Under amplitude obtain.
Target duty than being no more than duty cycle threshold always in one of the embodiments,；The electric tool includes
On-off switch；
The step of acquisition target duty ratio includes:
When the voltage of the battery pack of detection is greater than the preset voltage threshold, then exports the electric tool and open
The setting duty ratio that will be exported when machine is to motor control switch；
When the voltage of the battery pack of detection is less than or equal to preset voltage threshold, then duty cycle threshold is set as
Target duty ratio, and the target duty ratio is exported to motor control switch.
A kind of control circuit of electric tool, electric tool are provided with startup switch, the first end of the startup switch with
The output end of the battery pack is connected, and the electric tool control circuit includes:
Voltage detecting circuit, the input terminal of the voltage detecting circuit are connected with the second end of the startup switch, use
The voltage of battery pack when detecting electric tool booting；
It sets duty ratio and obtains circuit, for obtaining the setting duty ratio that will be exported when booting；
Controller, the first input end of the controller are connected with the output end of the voltage detecting circuit, the control
Second input terminal of device processed is connected with the output end of the setting duty detection circuit,
The controller is used to obtain target duty ratio when the voltage of the battery pack is less than or equal to voltage threshold, and
The target duty ratio is exported to motor control switch,
When the voltage of the battery pack is greater than voltage threshold, output setting duty ratio to motor control switch；
The basic information that duty ratio is set to be switched on according to the electric tool when generates.
The basic information in one of the embodiments: including operation mode information and/or positive and negative rotation pattern information.
Target duty is also used to than being no more than duty cycle threshold, the controller always in one of the embodiments:
When the setting duty ratio is less than duty cycle threshold, the setting duty ratio is obtained as target duty ratio；
When the setting duty ratio is more than or equal to the duty cycle threshold, obtains the duty cycle threshold and accounted for as target
Empty ratio.
The startup switch of the electric tool includes: the first on-off switch and potentiometer in one of the embodiments,；
The setting duty ratio obtains circuit: including 3rd resistor and the second capacitor,
The first end of the 3rd resistor is connected with the first feedback end of linked switch, the second end of the 3rd resistor
The output end of circuit is obtained after being connected with the first end of second capacitor as the setting duty ratio,
The second end of second capacitor is grounded after being connected with the second feedback end of the linked switch.
The startup switch of the electric tool includes: in one of the embodiments,
Second on-off switch and speed-regulating switch；
The feedback signal of speed-regulating switch output when setting duty ratio to be closed according to second on-off switch
It generates；
Or
The feedback signal of speed-regulating switch output when setting duty ratio to be closed according to second on-off switch
And basic information when electric tool booting generates.
The speed-regulating switch is multi-gear switch in one of the embodiments,；The feedback signal is according to the multi gear
The gear signal of speed-regulating switch output obtains.
The corresponding duty cycle threshold of the different stalls of the multi gear speed-regulating switch is not in one of the embodiments,
Together.
The speed-regulating switch is no gear slide switch in one of the embodiments,；The feedback signal is according to institute
The distance that slide switch slides is stated to obtain；Or
The speed-regulating switch is no gear rotary switch；The feedback signal is to be revolved according to the no gear rotary switch
Under amplitude obtain.
The voltage detecting circuit includes: in one of the embodiments,
First resistor, second resistance and first capacitor,
The first end of the first resistor is connected with the output end of the battery pack, the second end of the first resistor,
The first end of the first end of the second resistance and the first capacitor is electric as the voltage detecting after being connected
The output end on road,
The second end of the second end of the second resistance and first capacitor ground connection.
Above-mentioned electric tool control method and circuit, battery pack voltage when by detection electric tool booting, to judge
Whether need to adjust the duty ratio of output to motor control switch, if battery pack voltage when electric tool is switched on is less than or equal to
When voltage threshold, the remaining capacity of battery pack is less at this time, exports target duty ratio to motor control switch, to guarantee battery
The electricity of packet will not be reduced quickly, and then ensure that the voltage of battery pack is not less than over-discharge voltage, and electric tool is existed
Battery pack works when being in low battery, takes full advantage of the remaining capacity of battery pack.
Detailed description of the invention
Fig. 1 is the flow chart of electric tool control method in an embodiment；
Fig. 2 is the application circuit that battery pack is powered to electric tool in embodiment illustrated in fig. 1；
Fig. 3 is the another application circuit diagram that battery pack is powered to electric tool in embodiment illustrated in fig. 1；
Fig. 4 is the another application circuit that battery pack is powered to electric tool in embodiment illustrated in fig. 1；
Fig. 5 is the structural schematic diagram of electric tool control circuit in an embodiment.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, and
It is not used in the restriction present invention.
Before embodiment according to the present invention is described in detail, it should be noted that, the embodiment described essentially consist in
The combination of electric tool the control method step related to circuit and system component.Therefore, said system component and method and step
It is showed in position by ordinary symbol in the accompanying drawings, and merely illustrates and understand implementation of the invention
The related details of example, in order to avoid because of details those of apparent for having benefited from those of ordinary skill in the art of the invention
The disclosure is obscured.
Herein, such as left and right, upper and lower, front and rear, first and second etc relational terms are used merely to area
Divide an entity or movement and another entity or movement, and not necessarily requires or imply and is between this entity or movement any
Actual this relationship or sequence.The terms "include", "comprise" or any other variant are intended to cover non-exclusive inclusion, by
This to include the process, method, article or equipments of a series of elements not only to include these elements, but also includes not bright
The other element really listed, or be elements inherent to such a process, method, article, or device.
Refering to Figure 1, Fig. 1 is the flow chart of electric tool control method in an embodiment, it in this embodiment, should
Method may include:
S102: the voltage of battery pack when detection electric tool booting.
Specifically, the startup switch closure of electric tool, battery pack voltage is electrically connected to electric tool, i.e., to electronic work
Tool powers on, and electric tool booting, battery pack is powered by voltage conversion circuit (such as reduction voltage circuit) to controller, at this time controller
Not output duty cycle information.
It please referring to shown in Fig. 2, Fig. 2 is the application circuit that battery pack is powered to electric tool in embodiment illustrated in fig. 1,
In this embodiment, battery pack is connected with electric tool, and to power to electric tool, which can be lithium metal or lithium
Polymer battery packet, or battery pack is formed by for ni-Cd (NiCd), nickel metal hydride (NiMH) and plumbic acid.
Due in practical applications, the electricity of the battery pack can be reduced with the use of battery pack, when the electricity of battery pack
When reduction, voltage can then be reduced, especially in low battery state, for example, its rated output of battery pack is 20V, when
When its electric quantity consumption is to 20%, voltage may only have 15V, when its voltage is over-discharge voltage 13.5V, no longer output electricity
Can, therefore the electricity of battery pack can be judged by detecting the voltage of battery pack, it further also can determine that the electricity of battery pack
Whether amount is in the state of low battery.
S104: the setting duty ratio that will be exported when electric tool booting is obtained.
Specifically, the setting duty ratio that will be exported refers to that the controller of electric tool is preset or according to booting
When electric tool status information be formed by setting duty ratio, the setting duty ratio that will be exported does not export also to electricity at this time
Machine control switch.
As shown in Fig. 2, the cathode voltage of battery pack, controller powers at this time, does not export also when startup switch closure
Duty ratio is to motor control switch.When detecting the voltage of battery pack lower than above-mentioned preset voltage threshold, then it represents that electronic
Battery pack is in the state of low battery when tool one is switched on, if electric tool needs to carry out complex working condition at this time, such as drills
Deng then the output electric current of electric tool can be larger, i.e. output duty cycle is larger, and battery pack electric quantity consumption speed becomes faster, then can lead
Causing the remaining capacity of battery pack reduces, and the voltage of battery pack reduces rapidly, when the voltage of battery pack is lower than over-discharge voltage 13.5V
When, then battery pack no longer exports electric energy, will lead to electric tool and is forced to shut down in the short time after powering.
S106: when the voltage of the battery pack of detection is less than or equal to preset voltage threshold, then obtaining target duty ratio, and
Target duty ratio is exported to motor control switch.
S108:, then will when exporting electric tool booting when the voltage of the battery pack of detection is greater than preset voltage threshold
The setting duty ratio to be exported is to motor control switch.
Specifically, 20% when preset voltage threshold mentioned here can refer to the electric quantity consumption of battery pack to full electricity
Electricity floating voltage, be also possible to 30%, 25%, 22%, 18%, 15% etc. when the electric quantity consumption of battery pack to full electricity
When floating voltage.75%, 70%, 76%, 65%, 79% etc. of the voltage rating of battery pack can be either determined as,
The voltage threshold can be determined with other standards, referring for example to environmental index etc..
Specifically, motor control switch refers to the power control switching of motor, is generally made of metal-oxide-semiconductor, i.e. the motor
Control switch may include multiple power tubes, and multiple power tube can be metal-oxide-semiconductor.
Duty cycle threshold can be generally configured according to the needs of users, for example, be set as 30%, 35%, 25%,
27% etc., herein with no restrictions.
It in this embodiment, then can be into when judging battery pack in electric tool booting when state in low battery
The further control of row can get the setting duty ratio that electric tool will be exported in booting, according to electric tool first
Current state selection output target duty ratio, which is usually no more than setting duty ratio, so as to reduce electricity
The output electric current of the battery pack of power driven tools, thus the electric energy of battery pack will not consume it is too fast so that the voltage of battery pack will not wink
Between reduce so that electric tool battery pack work in the case where low-power (low-voltage) a period of time,
Complex working condition when will not be because of booting causes electric tool to be shut down once the triggering under-voltage protection that is switched on, and improves the experience of user,
And in the case where the remaining capacity of battery pack is not very high situation, the electric energy stored in battery pack can also be made full use of, to improve
Single Bao Nengli of battery pack.
Wherein when the voltage of battery pack is higher than voltage threshold, then setting duty ratio is exported to motor control switch.It is i.e. electric
It when the electricity of Chi Bao is still more sufficient, then can directly be exported by setting duty ratio, guarantee that electric tool can be normal
It uses.
Above-mentioned electric tool control method, battery pack voltage when by detection electric tool booting, to determine whether needing
The output duty cycle of battery pack is adjusted, if battery pack voltage when electric tool is switched on is less than or equal to voltage threshold, this
When battery pack remaining capacity it is less, export target duty ratio to motor control switch, to guarantee that the electricity of battery pack will not
It quickly reduces, and then ensures that the voltage of battery pack is not less than over-discharge voltage and electric tool is allowed to be in low electricity in battery pack
It works when amount, takes full advantage of the remaining capacity of battery pack.
Target duty obtains the step of target duty ratio than being no more than duty cycle threshold always in one of the embodiments,
Suddenly can also include, only when setting duty ratio and being more than or equal to duty cycle threshold, then using duty cycle threshold as target duty ratio,
To export target duty ratio to motor control switch i.e. output duty cycle threshold value to motor control switch；And when setting duty ratio
When less than duty cycle threshold, then duty ratio will be set as target duty ratio, will be opened to export target duty ratio to motor control
It closes i.e. output and sets duty ratio to motor control switch.It is i.e. lesser in selection output setting both duty ratio and duty cycle threshold
One value is to motor control switch, the certain time so that electric tool can work in battery pack low battery.It needs herein
It is clear that target duty sets duty ratio than being no more than always, and target duty than being also no more than duty cycle threshold always.
In one of the embodiments, continuing with shown in Figure 2, in Fig. 2, the startup switch of the electric tool is connection
Dynamic switch.In the above-described embodiments, the step of obtaining the setting duty ratio that will be exported when electric tool booting, i.e. step S104
It may include obtaining the feedback signal of linked switch output when linked switch closure；And the feedback exported according to linked switch
Signal acquisition sets duty ratio.
The linked switch includes the first on-off switch Q1 and potentiometer VR in one of the embodiments, sets duty ratio
The feedback signal of potentiometer VR output generates when to be closed according to the first on-off switch Q1.Specifically, as the first on-off switch Q1
When closure, electric tool booting, potentiometer VR exports feedback signal.When the linked switch is pressed, i.e. the first on-off switch
Q1 conducting, potentiometer VR can generate a feedback signal VR signal, available according to feedback signal VR signal
The setting duty ratio that electric tool will export when being switched on.Such as the first on-off switch Q1 quilt in one of the embodiments,
When pressing, a range signal can be generated, which can be sent to potentiometer VR, so that potentiometer VR output
Feedback signal VR signal changes, therefore when the amplitude difference that the first on-off switch Q1 is pressed, potentiometer VR,
The feedback signal VR signal of output is different, then setting duty ratio also can be different accordingly.In another embodiment, should
When first on-off switch Q1 is pressed, the movable contact that can touch potentiometer VR can be rotated accordingly, so that potentiometer VR is defeated
Feedback signal VR signal out changes, therefore when the amplitude difference that the first on-off switch Q1 is pressed, the potentiometer
The feedback signal VR signal of VR, output are different, then setting duty ratio also can be different accordingly.
Basic information when setting duty ratio to be switched on according to electric tool in one of the embodiments, generates, thus
The step of setting duty ratio is obtained according to the feedback signal of linked switch output, may include:
S202: basic information when electric tool booting is obtained.
The step of obtaining basic information when electric tool booting in one of the embodiments, may include: to obtain electricity
Operation mode information when power driven tools are switched on；Or positive and negative rotation pattern information when acquisition electric tool booting；Or obtain electricity
Operation mode information and positive and negative rotation pattern information when power driven tools are switched on.In other examples, the basis of the electric tool
Information can also include other information, and details are not described herein.
S204: the feedback signal of basic information and linked switch output when being switched on according to electric tool obtains setting and accounts for
Empty ratio.
In this embodiment, setting duty ratio is obtained not only according to the feedback signal of linked switch output, also passes through it
His basic information is set by multiple indexs, and setting duty ratio can be made more accurate.
In one of the embodiments, above-mentioned setting duty ratio can only electric tool be switched on when basic information generate,
Wherein the specific restriction of the basic information may refer to described above, and details are not described herein.
It is please referred to shown in Fig. 3 in one of the embodiments, Fig. 3 is battery pack in embodiment illustrated in fig. 1 to electric tool
The another application circuit diagram of power supply, in this embodiment, the startup switch of electric tool include the second on-off switch Q2 and speed regulation
Switch S.The feedback signal of speed-regulating switch S output when wherein setting duty ratio can be the second on-off switch Q2 closure.
In this embodiment, the step of setting duty ratio that will be exported when the booting of acquisition electric tool, may include:
S302: when the second on-off switch Q2 closure, the feedback signal of speed-regulating switch S output is obtained.
Specifically, speed-regulating switch S refers to the speed regulating switch of the motor of electric tool, and in this embodiment, second is logical
When disconnecting pass Q2 closure, i.e., electric tool powers on, and speed-regulating switch S can then export feedback signal.
S304: setting duty ratio is obtained according to the feedback signal of speed-regulating switch S output.
Specifically, when speed-regulating switch S can be the speed-regulating switch of speed stage, i.e. multi gear speed-regulating switch, such as can
Think multi gear toggle switch or multi gear rotary switch, feedback signal is that the gear signal exported according to multi gear speed-regulating switch S obtains,
Its gear can be set to two grades, three gears, four gears, five grades, six grades etc..In this embodiment, the anti-of speed-regulating switch S output is obtained
The step of feedback signal may include: to obtain feedback signal according to the gear signal of speed-regulating switch S output.In addition the gear signal can
To be directly disposed as feedback signal, in this embodiment it is possible to a table is arranged first, be stored in the table gear information and
The relationship for setting duty ratio, when getting the gear signal of speed-regulating switch S output, then directly inquiring the table can obtain
Corresponding setting duty ratio.In a further embodiment, corresponding setting can be calculated according to the feedback signal by formula etc.
Duty ratio, details are not described herein.
The step of obtaining duty cycle threshold in one of the embodiments, can be the gear exported according to speed-regulating switch S
The corresponding duty cycle threshold of signal acquisition, the i.e. corresponding duty cycle threshold of the different stalls of multi gear speed-regulating switch S are different.Such as it can
A table is arranged, it is stored with the relationship of gear information and duty cycle threshold in the table, is exported when getting speed-regulating switch S
Gear signal when, then corresponding duty cycle threshold can be obtained by directly inquiring the table.It in a further embodiment, can be with
Corresponding duty cycle threshold is calculated according to the feedback signal by formula etc., details are not described herein.In addition in practical applications, root
The duty cycle threshold changed according to the variation of the gear of multi gear speed-regulating switch S is generally higher than the setting duty ratio with gear.
Speed-regulating switch S can be no gear speed-regulating switch S in one of the embodiments,.For example, without gear speed-regulating switch
S be slide switch when, obtain speed-regulating switch S output feedback signal the step of, may include: according to slide switch slide away from
From the feedback signal for obtaining speed-regulating switch S output.For example, then its feedback signal is corresponding when the distance that slide switch slides is big
Increase, so that setting duty ratio can also become larger accordingly.When no shelves speed-regulating switch S is rotary switch, acquisition speed-regulating switch S is defeated
The step of feedback signal out may include: the feedback letter that speed-regulating switch S output is obtained according to the amplitude that rotary switch is screwed off
Number.For example, feedback signal also increases accordingly when the amplitude that rotary switch is screwed off becomes larger, also can to set duty ratio
Become larger accordingly.
The step of obtaining setting duty ratio according to the feedback signal of linked switch output in one of the embodiments, can
To include:
S402: basic information when electric tool booting is obtained.
The step of obtaining basic information when electric tool booting in one of the embodiments, may include: to obtain electricity
Operation mode information when power driven tools are switched on；Or positive and negative rotation pattern information when acquisition electric tool booting；Or obtain electricity
Operation mode information and positive and negative rotation pattern information when power driven tools are switched on.In other examples, the basis of the electric tool
Information can also include other information.
S404: the feedback signal of basic information and speed-regulating switch S output when being switched on according to electric tool obtains setting
Duty ratio.
In this embodiment, setting duty ratio is obtained not only according to the feedback signal of speed-regulating switch S output, also passes through it
His basic information is set by multiple indexs, and setting duty ratio can be made more accurate.
In other examples, basic information when can also be switched on according only to electric tool generates, wherein the basis
The specific restriction of information may refer to described above, and details are not described herein.
It is please referred to shown in Fig. 4 in one of the embodiments, Fig. 4 is battery pack in embodiment illustrated in fig. 1 to electric tool
The another application circuit of power supply.In this embodiment, target duty than being no more than duty cycle threshold, the packet of electric tool always
Include on-off switch；Obtain target duty than the step of include: when the voltage of the battery pack of detection be greater than preset voltage threshold when,
The setting duty ratio that will export is to motor control switch when then exporting electric tool booting；When the voltage of the battery pack of detection is small
When being equal to preset voltage threshold, then duty cycle threshold is set as target duty ratio, and export target duty ratio to motor
Control switch.Such as electric tool control method further include: the setting that presetting will export when electric tool booting accounts for
The step of sky compares.The setting duty ratio that the preset electric tool will export when being switched on is generally relatively high, and for example, 100%
Deng.Therefore the step of obtaining the setting duty ratio that will be exported when electric tool booting, is specifically as follows: obtaining preset electronic
The setting duty ratio that tool will export when being switched on.It in this embodiment, will be defeated when being switched on due to the preset electric tool
Setting duty out is relatively high, generally greater than duty cycle threshold, therefore in this embodiment it is possible to does not need to determine preset electricity
The size of setting duty ratio and duty cycle threshold that power driven tools will export when being switched on, when the voltage for detecting battery pack is higher than electricity
When pressing threshold value, then the setting duty ratio that will be exported when preset electric tool booting is directly exported.When the voltage of battery pack
When less than or equal to voltage threshold, that is, it is in low-voltage state, then can directly export the duty cycle threshold at this time to motor control
Switch.
It is specifically as follows the step of the voltage of battery pack when the booting of detection electric tool in one of the embodiments:
S502: the voltage of battery pack when periodic samples electric tool is switched on；
Specifically, for electric tool in open state, the voltage of battery pack might have certain fluctuation, therefore this implementation
Example in by periodic samples later determine the voltage of battery pack within a certain period of time, and by way of weighted average come
It obtains in electric tool booting, the voltage of battery pack, more accurately to track the voltage of battery pack.
S504: the average value of sampled battery pack voltage is calculated, using average value as battery pack voltage.
It please refers to shown in Fig. 5, Fig. 5 is the structural schematic diagram of the control circuit of electric tool in an embodiment, in the implementation
In example, startup switch is provided on electric tool, the first end of startup switch is connected with the output end of battery pack 100, electronic
Tool control circuit may include voltage detecting circuit 200, setting duty ratio acquisition circuit 300 and controller 400, voltage inspection
The input terminal of slowdown monitoring circuit 200 is connected with the second end of startup switch, the first input end and voltage detecting circuit of controller 400
200 output end is connected, and the second input terminal of controller 400 is connected with the output end of setting duty detection circuit.
In this embodiment, when startup switch is closed, battery pack 100 exports electric energy, when the electricity of battery pack 100 is sufficient
When, the anode of battery pack 100 is generally 20V, and after startup switch, the input terminal of voltage detecting circuit 200 is also 20V, but
When the electricity of battery pack 100 is inadequate, such as its rated output of battery pack 100 is 20V, when its electric quantity consumption extremely
When 20%, voltage may only have 15V.In the moment of electric tool booting, the also non-output duty cycle of controller 400 to motor control
Switch 500 is made, 100 Voltage Feedback of battery pack when the detection electric tool of voltage detecting circuit 200 is switched on to controller 400, by
Controller 400 judges battery pack 100 whether in low battery state, when concurrently setting the duty ratio acquisition acquisition booting of circuit 300
The setting duty ratio that will be exported feeds back to controller 400, at this time controller 400 can the voltage of battery pack 100 be less than etc.
When voltage threshold, target duty ratio is obtained, and export target duty ratio to motor control switch, in the voltage of battery pack 100
When greater than voltage threshold, the setting duty ratio that will export is to motor control switch when output electric tool booting.
Basic information when setting duty ratio to be switched on according to electric tool in one of the embodiments, generates, and into
One step, basic information may include operation mode information and/or positive and negative rotation pattern information.
Target duty than being no more than duty cycle threshold always in one of the embodiments, so that controller can also be used
In when setting duty ratio less than duty cycle threshold, then obtaining setting duty ratio as target duty ratio, when setting, duty ratio is big
When being equal to duty cycle threshold, then duty cycle threshold is obtained as target duty ratio.
Electric tool control circuit further includes reduction voltage circuit in one of the embodiments, the input terminal of reduction voltage circuit with
The second end of startup switch is connected, and the voltage that reduction voltage circuit is used to drop battery pack 100 is powered after reducing to controller 400.
It is please referred to shown in Fig. 2 in one of the embodiments, the switch of electric tool is linked switch.Set duty ratio
Circuit 300 is obtained to be used to obtain the feedback signal of linked switch output in linked switch closure；And it is exported according to linked switch
Feedback signal calculate setting duty ratio.
In this embodiment, linked switch may include the first on-off switch Q1 and potentiometer VR；First on-off switch Q1
For controlling electric tool booting or shutdown；Potentiometer VR is used to export feedback signal in the first on-off switch closure.
It may include the electricity of 3rd resistor R3 and second that setting duty ratio, which obtains circuit 300, in one of the embodiments,
Hold C2, the first end of 3rd resistor R3 is connected with the first feedback end of linked switch, the second end of 3rd resistor R3 and second
The first end of capacitor C2 obtains the output end of circuit 300, the second end of the second capacitor C2 as the setting duty ratio after being connected
It is grounded after being connected with the second feedback end of linked switch.
Electric tool control circuit further includes that basic information obtains circuit, the basic information in one of the embodiments,
The output end for obtaining circuit is connected with the third input terminal of controller 400, and it is electronic for obtaining which obtains circuit
Basic information when tool is switched on.Basic information and linked switch when controller 400 is also used to be switched on according to electric tool
The feedback signal of output obtains setting duty ratio.
It includes that operation mode obtains circuit that basic information, which obtains circuit, in one of the embodiments, which obtains
Sense circuit is used to obtain operation mode information when electric tool booting；Or it includes positive and negative rotary-die type that basic information, which obtains circuit,
Circuit is obtained, which is used to obtain positive and negative rotation pattern information when electric tool booting；Or basis
Acquisition of information circuit includes that operation mode obtains circuit and positive and negative rotation pattern acquiring circuit, which obtains circuit for obtaining
Operation mode information positive and negative rotation pattern acquiring circuit when electric tool being taken to be switched on is for obtaining when electric tool is switched on just
Reversing mode information.
The startup switch of electric tool includes the second on-off switch Q2 and speed-regulating switch S in one of the embodiments,；If
Determine duty ratio and obtains circuit 300 for obtaining the feedback signal of speed-regulating switch S output in the second on-off switch closure；And root
Setting duty ratio is obtained according to the feedback signal of speed-regulating switch S output.
Speed-regulating switch S is multi-gear switch in one of the embodiments,；According to the feedback signal of speed-regulating switch S output
Feedback signal acquired in the gear signal of multi gear speed-regulating switch S output.Controller is also used to the shelves exported according to speed-regulating switch S
The corresponding duty cycle threshold of position signal acquisition, the i.e. corresponding duty cycle threshold of the different stalls of multi gear speed-regulating switch are different.
In another embodiment, speed-regulating switch S is no gear speed-regulating switch.It is wherein sliding without gear speed-regulating switch
When switch, the feedback signal of speed-regulating switch S output is the feedback signal according to acquired in the distance that slide switch slides；Or it adjusts
When speed switch S is rotary switch, the feedback signal of speed-regulating switch S output is according to acquired in the amplitude that rotary switch is screwed off
Feedback signal.
Electric tool control circuit in one of the embodiments, further include: basic information obtains circuit, the basic information
The output end for obtaining circuit is connected with the third input terminal of controller 400, and it is electronic for obtaining which obtains circuit
Basic information when tool is switched on.Basic information and speed-regulating switch S when controller 400 is also used to be switched on according to electric tool
The feedback signal of output obtains setting duty ratio.
It includes that operation mode obtains circuit that basic information, which obtains circuit, in one of the embodiments, which obtains
Sense circuit is used to obtain operation mode information when electric tool booting；Or it includes positive and negative rotary-die type that basic information, which obtains circuit,
Circuit is obtained, which is used to obtain positive and negative rotation pattern information when electric tool booting；Or basis
Acquisition of information circuit includes that operation mode obtains circuit and positive and negative rotation pattern acquiring circuit, which obtains circuit for obtaining
Operation mode information positive and negative rotation pattern acquiring circuit when electric tool being taken to be switched on is for obtaining when electric tool is switched on just
Reversing mode information.
For target duty than being no more than duty cycle threshold always, electric tool includes on-off in one of the embodiments,
Switch, electric tool control circuit further include: preinstalled circuit, the output end and setting duty ratio of preinstalled circuit obtain circuit 300
Input terminal be connected, the setting duty ratio that will export when which is used to preset electric tool booting.This is pre-
If electric tool booting when the setting duty ratio that will export it is generally relatively high, for example, 100% etc..Duty ratio is set to obtain
Circuit 300 is used to obtain the setting duty ratio that will be exported when the booting of preset electric tool.In this embodiment, since this is pre-
If electric tool booting when the setting duty that will export it is relatively high, generally greater than duty cycle threshold, therefore in the embodiment
In, it may not be necessary to determine the size of the setting duty ratio and duty cycle threshold that will export when the booting of preset electric tool,
When the voltage for detecting battery pack is higher than voltage threshold, then will be exported when directly exporting preset electric tool booting
Set duty ratio.When the voltage of battery pack is less than or equal to voltage threshold, that is, be in low-voltage state, then it at this time can be directly defeated
The duty cycle threshold is to motor control switch out.
Voltage detecting circuit 200 includes first resistor R1, second resistance R2 and the first electricity in one of the embodiments,
Hold C1, the first end of first resistor R1 is connected with the output end of battery pack 100, second end, the second resistance of first resistor R1
Output end as the voltage detecting circuit 200 after the first end of R2 and the first end of first capacitor C1 are connected, the second electricity
Hinder the second end of R2 and the second end ground connection of first capacitor C1.
Details are not described herein for the related content of above-mentioned electric tool control circuit, is referred to electric tool control method
Description.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of electric tool control method, which is characterized in that the described method includes:
The voltage of battery pack when detecting electric tool booting；
Obtain the setting duty ratio that will be exported when electric tool booting；
When the voltage of the battery pack of detection is less than or equal to preset voltage threshold, then target duty ratio is obtained, and export
The target duty ratio is to motor control switch；
When the voltage of the battery pack of detection is greater than the preset voltage threshold, then when exporting electric tool booting
The setting duty ratio that will be exported is to motor control switch；
The basic information that duty ratio is set to be switched on according to the electric tool when generates.
2. the method according to claim 1, wherein the basic information includes operation mode information and/or just
Reversing mode information.
3. method according to claim 1 or 2, which is characterized in that target duty than being no more than duty cycle threshold always；Institute
Stating the step of obtaining target duty ratio includes:
When the setting duty ratio is less than duty cycle threshold, the setting duty ratio is obtained as target duty ratio；
When the setting duty ratio is more than or equal to the duty cycle threshold, the duty cycle threshold is obtained as target duty
Than.
4. according to the method described in claim 3, it is characterized in that, the startup switch of the electric tool includes: the first on-off
Switch and potentiometer；
The feedback signal of potentiometer output when setting duty ratio to be closed according to first on-off switch generates；
Or
The feedback signal of potentiometer output when setting duty ratio to be closed according to first on-off switch and described
Basic information when electric tool is switched on generates.
5. according to the method described in claim 3, it is characterized in that, the startup switch of the electric tool includes: the second on-off
Switch and speed-regulating switch；
The feedback signal of speed-regulating switch output when setting duty ratio to be closed according to second on-off switch generates；
Or
The feedback signal of speed-regulating switch output when setting duty ratio to be closed according to second on-off switch and
The basic information when electric tool is switched on generates.
6. according to the method described in claim 5, it is characterized in that, the speed-regulating switch is multi gear position speed-regulating switch；It is described anti-
Feedback signal is that the gear signal exported according to the multi gear speed-regulating switch obtains.
7. according to the method described in claim 6, it is characterized in that, the corresponding institute of the different stalls of multi gear position speed-regulating switch
State duty cycle threshold difference.
8. described anti-according to the method described in claim 5, it is characterized in that, the speed-regulating switch is no gear slide switch
Feedback signal is that the distance slided according to the slide switch obtains；
Or
The speed-regulating switch is no gear rotary switch, and the feedback signal is screwed off according to the no gear rotary switch
Amplitude obtains.
9. method according to claim 1 or 2, which is characterized in that target duty than being no more than duty cycle threshold always；Institute
State electric tool includes on-off switch；
The step of acquisition target duty ratio includes:
When the voltage of the battery pack of detection is greater than the preset voltage threshold, then when exporting electric tool booting
The setting duty ratio that will be exported is to motor control switch；
When the voltage of the battery pack of detection is less than or equal to preset voltage threshold, then duty cycle threshold is set as target
Duty ratio, and the target duty ratio is exported to motor control switch.
10. a kind of control circuit of electric tool, electric tool is provided with startup switch, the first end of the startup switch and institute
The output end for stating battery pack is connected, which is characterized in that the electric tool control circuit includes:
Voltage detecting circuit, the input terminal of the voltage detecting circuit is connected with the second end of the startup switch, for examining
Survey the voltage of battery pack when electric tool booting；
It sets duty ratio and obtains circuit, for obtaining the setting duty ratio that will be exported when booting；
Controller, the first input end of the controller are connected with the output end of the voltage detecting circuit, the controller
The second input terminal with it is described setting duty detection circuit output end be connected,
The controller is used to obtain target duty ratio, and export when the voltage of the battery pack is less than or equal to voltage threshold
The target duty ratio to motor control switch,
When the voltage of the battery pack is greater than voltage threshold, output setting duty ratio to motor control switch；
The basic information that duty ratio is set to be switched on according to the electric tool when generates.
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| CN201711062568.6A CN109755975B (en) | 2017-11-02 | 2017-11-02 | Electric tool control method and circuit |
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| CN201711062568.6A CN109755975B (en) | 2017-11-02 | 2017-11-02 | Electric tool control method and circuit |
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| CN112405255A (en) * | 2019-08-22 | 2021-02-26 | 南京德朔实业有限公司 | DC electric equipment rotating speed control method and control device and DC electric equipment |
| CN112688595A (en) * | 2020-12-08 | 2021-04-20 | 浙江普莱得电器股份有限公司 | Motor duty ratio control method for electric tool |
| CN113616068A (en) * | 2020-05-07 | 2021-11-09 | 云米互联科技(广东)有限公司 | Juicer control method, juicer, and computer-readable storage medium |
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| CN109755975B (en) | 2021-12-07 |
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