CN102279367A - Electric tool control circuit and operating method thereof - Google Patents
Electric tool control circuit and operating method thereof Download PDFInfo
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- CN102279367A CN102279367A CN2010102699741A CN201010269974A CN102279367A CN 102279367 A CN102279367 A CN 102279367A CN 2010102699741 A CN2010102699741 A CN 2010102699741A CN 201010269974 A CN201010269974 A CN 201010269974A CN 102279367 A CN102279367 A CN 102279367A
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Abstract
The invention discloses a control circuit of an electric tool and an operating method thereof. The electric tool control circuit comprises a battery pack detection circuit, an operating control circuit, an electric quantity indicating circuit and a current measuring and calculating circuit, wherein the electric quantity indicating circuit is used for displaying an electric quality operating result; the current measuring and calculating circuit is used for measuring and calculating current I flowing through a motor; and the electric quantity operating result of the operating control circuit further comprises internal and loop voltage consumption of the battery pack. The method for operating the electric tool comprises the following steps of: pressing a switch to electrically connect the motor with a battery; measuring parameters of the battery and controlling running or stop of the motor; after the motor starts running, measuring and calculating the electric quality; and displaying the electric quantity operating result on an electric quantity indicating device.
Description
The application is for application number is 201010204598.8, the applying date is on June 11st, 2010, title is dividing an application that " demonstrations of electric tool electric weight " China applies for.
Technical field
The present invention relates to a kind of control circuit and method of operating thereof of electric tool.
Background technology
Generally, use the direct current electric power tools of power brick all to have the function of detection and pilot cell bag dump energy.Generally speaking, the battery dump energy that shows, be by direct measurement battery both end voltage and obtain, when power brick since discharge and temperature when raising internal resistance also change thereupon, the measuring voltage of this moment can not reflect the electric energy that battery reality can provide for motor accurately, causes the deviation that shows of dump energy.
Simultaneously, this detection and indication were all carried out before the power brick CD-ROM drive motor is started working, and after motor was started working, the electric weight indicating device just extinguished, and simultaneously the detection of power brick was also no longer carried out.
After this detection and indicating mode cause electric tool Once you begin to work, the user just can't understand the electric weight residue situation of power brick, simultaneously owing to the no longer monitoring to other parameters of power brick, in case power brick overcurrent or excess temperature, can't in time report to the police and quit work, bring danger to the user.
Summary of the invention
In order to overcome deficiency of the prior art and defective, the invention provides a kind of electric tool control circuit that improves these problems, and method of operating.
For reaching above purpose, the control circuit that is applicable to electric tool that the present invention discloses, comprise with power brick and be electrically connected, comprise the voltage V ' between two measurement points measuring the power brick two ends, and the power brick testing circuit of detection battery temperature, computing obtains the battery electric quantity operation result according to the detected power brick both end voltage of testing circuit value, and control arithmetic control circuit in conjunction with the power brick temperature at least to the power supply of motor, wherein the battery electric quantity operation result is power brick open-circuit voltage V, be used to show the electric weight indicating circuit of this electric weight operation result, be used to calculate the electric current estimation circuit of electric current I of motor of flowing through, the electric weight operation result of this arithmetic control circuit also comprises the inner and loop institute power consumption pressure of power brick.
This control circuit considered the battery discharge loop voltage and since the battery discharge temperature raise, give the battery discharge loop resistance deviation that measuring and calculating brings, the measuring and calculating voltage that makes power brick is more near the virtual voltage of power brick, and then makes the demonstration of battery dump energy more accurate.
Simultaneously, the present invention also provides a kind of method of improving the operation electric tool of these problems.The method of the operation electric tool that the present invention discloses comprises presses switch, so that motor and battery are electrically connected, measures the parameter of battery, and control the operation of motor thus or stop, behind the motor operation, carry out the electric weight computing, the electric weight operation result is shown on the electric weight indicating device.
Before motor is started working, the parameters of battery is detected judgement, the influence that can avoid the undesired situation because of battery that motor is caused, and the appearance of dangerous situation.After starting working, motor carries out the computing and the demonstration of battery dump energy, and the detection judgement of battery parameters is carried out in circulation, and the computing of dump energy and demonstration, can be in battery operated process the working condition of monitoring battery in real time, make the discharge work of battery safer, the real-time detection of dump energy simultaneously shows, makes the indication of dump energy more accurate.
Description of drawings
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is an electric tool stereographic map of the present invention.
Fig. 2 is electric tool electric weight display circuit module figure of the present invention.
Fig. 3 is electric tool photosignal emission of the present invention, receives schematic diagram.
Fig. 4 is an electric tool fiber device structural drawing of the present invention.
Fig. 5 is electric tool control circuit module figure of the present invention.
Fig. 6 is an electric tool control circuit circuit diagram of the present invention.
Fig. 7 is an electric tool control circuit process flow diagram of the present invention.
Fig. 8 is electric tool electric weight computing circuit figure of the present invention.
Specific embodiments
Below in conjunction with drawings and the specific embodiments to the detailed description of the invention.
Direct current electric power tools under common working condition, comprises the motor that is installed in the casing, switch, and the power brick that contains the more piece rechargeable battery.On fuselage and power brick, the electric weight indicating device that power brick electric weight situation is shown is installed all.With the electric drill is example, and as shown in Figure 1, the fuselage 16 and the power brick 15 of this electric drill all have the electric weight indicating device, and its middle machine body electric weight indicating device 14 is installed on fuselage 16 tops, and power brick electric weight indicating device 13 is installed on power brick 15 rear sides.This power brick electric weight indicating device 13 and fuselage electric weight indicating device 14 be red and green color LED lamp preferably, can show three kinds of colors, pilot lamp shows redness when red LED lamp is bright, and pilot lamp showed green when green LED lamp was bright, and pilot lamp showed orange when hot green two LED were simultaneously bright.In the present invention, green light represents that the power brick dump energy is " expiring " state, and orange lamp represents that the power brick dump energy is " centre " state, and red light represents that the power brick dump energy is a " low " state.LED light also can be replaced by LCD display.
Be illustrated in figure 2 as the electric weight display circuit circuit diagram of direct current electric power tools, comprise first circuit 1 and second circuit 2.Wherein, first circuit 1 is positioned at power brick, comprises power brick testing circuit 3, arithmetic control circuit 4, electric weight indicating circuit 9, and optical signal launcher 6.Second circuit 2 is positioned at fuselage, comprises light signal receiving 7, and electric weight indicating circuit 8.
During this electric weight display circuit work, in first circuit 1 on power brick, 3 pairs of cell voltages of power brick testing circuit, battery temperature, battery discharge current detects respectively, and testing result is fed back to arithmetic control circuit 4, and 4 pairs of testing results of arithmetic control circuit are carried out computing and judgement, and operation result fed back to the electric weight indicating circuit 9 that comprises the electric weight indicating device, to carry out the demonstration of dump energy.Concrete detection and operational method will be explained below.Optical signal launcher 6 is sent to the light signal receiving 7 that is positioned at fuselage with the electric quantity signal of arithmetic control circuit 4.Light signal receiving 7 will receive to such an extent that electric quantity signal feeds back to electric weight indicating circuit 8 on the fuselage, to show dump energy on fuselage.
Preferably, optical signal launcher 6 is the photosignal radiating circuit, and light signal receiving 7 is a photovalve.The operation result that arithmetic control circuit 4 produces offers optical signal launcher 6 with the form of high-low level.Optical signal launcher 6 sends to second circuit 2 on the fuselage with the level signal that receives by the photoemission mode.Light signal receiving 7 in the second circuit 2 is used to receive the photosignal that first circuit 1 on the power brick sends, offer electric weight indicating circuit 8, electric weight indicating circuit 8 comprises the electric weight indicating device, it is the dual-colored LED lamp herein, show different colors according to different level signal control dual-colored LED lamps, or show on LCD display in modes such as numeral, histogram lamps, with the dump energy of pilot cell.
The emission of as shown in Figure 3 photosignal, receive shown in the schematic diagram, the emission of photosignal, receive the photosignal that comprises the photosignal radiating circuit 39 that is positioned on the power brick and be positioned on the fuselage and receive display circuit 28.Photosignal radiating circuit 39 comprises photovalve 19,20, and being used for electrical signal conversion is light signal, launches light signal then.Photosignal receives display circuit 28 and comprises photovalve 40, is used for receiving optical signals, will receive to such an extent that light signal is converted to electric signal then, and show by electric weight indicating circuit 8.Above-mentioned photovalve can be photoresistance, infrared light transmits and receives element, PIN diode etc., herein preferably infrared light radiated element and infrared light receiving element.Photosignal radiating circuit 39 of the present invention comprises infrared light power valve 19 and infrared light power valve 20, photosignal receives display circuit 28 and comprises electric weight indicating circuit 8 and infrared electro element 40, wherein electric weight indicating circuit 8 comprises power supply 21, electric weight indicating device, infrared electro element 40 comprise infrared light receiving tube 25 and infrared light receiving tube 26.Electric weight indicating device in the electric weight indicating circuit 8 is LED lamp 22 and LED lamp 23.Infrared light receiving tube 25 and infrared light receiving tube 26 are responsible for the reception of two-way infrared signal respectively, to control the work of LED lamp 22 and LED lamp 23 respectively.
When photosignal radiating circuit 39 and 28 work of photosignal reception display circuit, the control end 17 of photosignal radiating circuit 39 and control end 18 receive the two-way level controling signal from arithmetic control circuit 4, photosignal radiating circuit 39 is converted into light signal, emission then, after photosignal reception display circuit 28 receives light signal, be converted into level signal, the control display device shows corresponding result.When the two path control signal that receives when photosignal radiating circuit 39 is high level, circuit turn-on, infrared light power valve 19,20 emission infrared signals, the infrared light receiving tube 25,26 that photosignal receives display circuit 28 receives infrared signal, conducting, then LED lamp 22 and LED lamp 23 are bright; When two path control signal was low level, infrared light power valve 19,20 was not launched infrared signal, and infrared light receiving tube 25,26 disconnects, and LED lamp 22 and LED lamp 23 do not work.When two path control signal is one road high level, during one tunnel low level, a paths of LEDs lamp of infrared light receiving tube that receives high level is bright, and a paths of LEDs lamp that does not receive the infrared receiving tube of high level does not work.
In another embodiment, this light signal emission, also available fiber device realization of receive mode.Be illustrated in figure 4 as the fiber device structural drawing, under this mode, fiber device comprise be positioned at power brick 15, as first light-guide device 36 of optical signal launcher and be positioned at fuselage 16, as second light-guide device 37 of light signal receiving.Wherein, first light-guide device 36 comprises light-conductive optic fibre 36c and leaded light post 36b, and the end of light-conductive optic fibre 36c has the first light guiding surface 36a of close fuselage 16, and the other end links to each other with leaded light post 36b.Second light-guide device 37 comprises light-conductive optic fibre 37c and leaded light post 37b, and the end of light-conductive optic fibre 37c has the second light guiding surface 37a of close power brick 15, and the other end links to each other with leaded light post 37b.The leaded light post 36b of first light-guide device 36 is relative with power brick electric weight indicating device 13, is used to strengthen the light signal of power brick electric weight pilot lamp, is convenient to light-conductive optic fibre 36c, 37c conduction.The leaded light post 37b of second light-guide device 37 is relative with fuselage electric weight indicating device 14, is used for the light signal that light-conductive optic fibre 37c conduction comes is strengthened, and is convenient to fuselage electric weight indicating device 14 and shows.Power brick electric weight indicating device 13 and fuselage electric weight indicating device 14 are the dual-colored LED lamp herein.
Be installed to the fuselage 16 of electric tool when power brick 15 after, the first light guiding surface 36a of first light-guide device 36 is relative with the second light guiding surface 37a of second light-guide device 37, and light signal can conduct between light-conductive optic fibre 36c, 37c smoothly.The light signal that power brick electric weight indicating device 13 sends, after strengthening, leaded light post 36b conducts to fuselage 16 by light-conductive optic fibre 36c, 37c, and by the enhancing of the leaded light post 37b on the fuselage 16, thereby make fuselage electric weight indicating device 14 luminous, the light that makes fuselage electric weight indicating device 14 send is consistent with the light signal that power brick electric weight indicating device 13 sends.
Thus, on the power brick He on the fuselage electric weight indicating device is installed all, can makes the user when operation tool, all can see the dump energy indicating device easily, with the situation of timely understanding power brick dump energy at unspecified angle.Simultaneously, the electric weight indicating device on power brick and the fuselage, demonstration be the output result of same power brick testing circuit and arithmetic control circuit, both signals have higher unitarity.Use photoemission receive mode or fiber optic conduction mode, more traditional communication mode more is not subject to disturb, signal stabilization degree and accuracy height, and simultaneously, above-mentioned signal emission, receive mode more traditional communications transmit receiving trap on installation cost is lower.
Be illustrated in figure 5 as electric tool control circuit module figure, comprise switch 10, motor 11, power brick testing circuit 3, arithmetic control circuit 4, battery 12, electric weight indicating circuit 9.This control circuit is in power brick, to the power brick dump energy detect, computing, indication, and the circuit of control motor operations.
During this electric tool control circuit work, the user presses the switch 10 of electric tool, and power brick testing circuit 3 begins to detect.Power brick testing circuit 3 comprises the detection to the voltage of battery 12, electric current, battery temperature, testing result is fed back to arithmetic control circuit 4 after finishing detection.Arithmetic control circuit 4 has comprised the CPU and the semiconductor switch of computing, judgement, control action.CPU also can be replaced by microcontrollers such as MCU or ARM herein, and semiconductor switch also can be replaced by MOSFET.Wherein, CPU to data such as power brick testing circuit 3 detected voltages, electric current, battery temperature compare with predeterminated voltage value, predetermined current value, default battery temperature value respectively, computing, judgement.To judge then and computing after control signal feed back to motor 11, electric weight indicating circuit 9 and illumination and indicating circuit 5, with control motor 11 whether work the demonstration situation of electric weight indicating circuit 9, and the working condition of illuminating lamp.Concrete comparison, computing, deterministic process will be explained below.
As Fig. 6 is the physical circuit figure of electric tool control circuit, comprise power brick 33, switch 10, motor 11, arithmetic control circuit 4, electric weight indicating circuit 9, illumination and indicating circuit 5, power circuit 32, and the power brick testing circuit of forming by voltage detecting circuit 29, electric current estimation circuit 30, battery temperature testing circuit 31.
In voltage detecting circuit 29, after switch 10 closures, the a point is a high level, triode Q7B saturation conduction, thus triode Q7A saturation conduction made, and power brick 33 voltages add to the b point, after R34 and C16 dividing potential drop, the pin one 1 of CPU records the c point voltage, thereby CPU calculates the b point voltage, i.e. power brick 33 magnitudes of voltage.The voltage that detects of voltage detecting circuit 29 is the power brick 33 and the voltage of drawing two ends such as wiring, switch herein.
In battery temperature testing circuit 31, temperature sensor t
NTCBe thermistor, be affixed on the power brick outer wall t
NTCAfter the R47 dividing potential drop, 11 pin of CPU record the g point voltage, obtain battery temperature.As the power brick excess temperature, temperature sensor t then
NTCResistance reduces.CPU judges whether excess temperature of power brick by g point voltage value.
In electric current estimation circuit 30,12 pin of CPU are by surveying the h point voltage, and by R50, the dividing potential drop of R51 relation obtains Q9 two ends e, the voltage of f, and the conducting resistance of known Q9, CPU calculates the power brick current value I.After CPU comparison power brick 33 magnitudes of voltage, temperature value and current value all satisfied motor 11 entry conditions, by the pin two output low level of CPU, triode Q8 ended, and the d point voltage adds to 1 pin of pipe Q9, makes the Q9 saturation conduction, motor 11 work.In other embodiments, electric current estimation circuit 30 also can be independent with the power brick testing circuit.
In illumination and indicating circuit 5, control signal is provided by the pin 9 of CPU, and when control signal during for lasting high level, triode Q10 conducting, lighting pilot lamp 34 is bright; When control signal is a low level, or when not having control signal, triode Q10 ends, and lighting pilot lamp 34 does not work; When control signal is a high-low level when replacing, the conducting that triode Q10 replaces and end lighting pilot lamp 34 flickers.Wherein, lighting pilot lamp 34 is a white led lamps, and generally for electric tool provides lighting source, when the abnormal state of electrician's instrument, lighting pilot lamp 34 flickers provide alerting signal.
Be illustrated in figure 7 as electric tool control circuit process flow diagram, after the dump energy display circuit was started working, the CPU that computing is responsible in the initialization of program elder generation carried out the judgement of cell voltage then.Be lower than default total battery voltage value A1 as cell voltage, then CPU output low level signal is given semiconductor switch, and semiconductor switch turn-offs, and motor does not change.Send simultaneously and judge signal to electric weight indicating circuit 9, red LED lamp is bright, shows that battery is under-voltage.Further, CPU divided by the battery unit number, obtains the voltage of single battery with the magnitude of voltage that records, is lower than single battery voltage preset value A2 as single battery voltage, and then red LED lamp is extinguished; More than or equal to single battery voltage preset value A2, then red LED lamp is lasting bright as single battery voltage, and circulation is simultaneously carried out the comparison of single battery voltage is judged.
More than or equal to default total battery voltage value A1, then CPU output high level signal is given semiconductor switch as voltage, the semiconductor switch conducting, and program moves to the judgement to the battery discharge temperature downwards.
More than or equal to preset value C, then CPU output low level signal is given semiconductor switch as battery temperature, and semiconductor switch turn-offs, and motor is not worked.CPU sends and judges signal to illumination and indicating circuit 5 simultaneously, and lighting pilot lamp 34 constantly glimmers, and plays the warning effect.This moment, battery was in over-temperature condition, and the warning of illuminating lamp can make the user note this excess temperature situation, and power brick Yin Wendu is too high to cause danger to avoid.
Less than preset value C, then CPU output high level signal is given semiconductor switch, semiconductor switch conducting, motor operation as battery temperature.Program moves to the judgement to battery discharge current downwards simultaneously.
More than or equal to default discharge current value B, then CPU output low level signal is given semiconductor switch as battery discharge current, and semiconductor switch turn-offs, and motor quits work.CPU sends and judges signal to illumination and indicating circuit 5 simultaneously, and lighting pilot lamp 34 constantly glimmers, and plays the warning effect.When discharge circuit is in over-current state, the fault such as may cause that motor burns out if motor works on.The warning of illuminating lamp can make the user note this over-current state, to avoid motor failure.
Less than default discharge current value B, then CPU output high level signal is given semiconductor switch as battery discharge current, the semiconductor switch conducting, and motor works on, and program moves to the electric weight computing downwards simultaneously.
In the electric weight computing, the computing of electric weight is calculation of parameter with voltage.Generally, have a plurality of internal resistances in the discharge loop of power brick, as power brick internal resistance, contact pin internal resistance, wiring internal resistance, loop internal resistance etc.In the present invention, the Copper Foil internal resistance integrating representation on wiring internal resistance, contact pin internal resistance and the pcb board is R
c, the power brick internal resistance is expressed as R
bElectric weight computing circuit figure with reference to as shown in Figure 8 comprises switch 10, power brick 33, motor 11, semiconductor switch 35, and loop internal resistance R
cWherein power brick 33 comprises battery 38 and power brick internal resistance R
b, semiconductor switch 35 comprises metal-oxide-semiconductor Q9 and semiconductor switch internal resistance R
MosBecause under different temperature, same resistance can show different resistance measuring and calculating values, for accurate this power brick internal resistance R
bMeasuring and calculating, a default temperature compensation coefficient C
t, be used to compensate because the power brick internal resistance resistance deviation that temperature causes.This temperature compensation coefficient C
tUnder the temperature when the battery operate as normal, the measuring and calculating penalty coefficient of power brick internal resistance.
When voltage detecting circuit 29 carried out voltage detecting, the detection voltage V ' that measures was the voltage between m, the n, i.e. m point voltage over the ground at 2.Semiconductor switch 35 both end voltage are that voltage is V between 2 of m ', the n
MosThe electric current in whole loop records voltage V between m ', the n at 2 by foregoing electric current estimation circuit 30
Mos, divided by known semiconductor switch 35 internal resistance R
MosObtain the current value I in loop.
In the electric weight computing circuit, the voltage V at power brick 33 two ends
b, with loop internal resistance R
cThe voltage V at two ends
c, the relation that detects between the voltage V ' is as follows:
V
b＝V
c+V’
And when electric tool was worked, motor 11 available power were removed by power brick 33 and are power brick internal resistance R
b, loop internal resistance R
c, the electric energy beyond the electric energy that provides of semiconductor switch 35.So the shown battery dump energy of electric weight indicating device is determined that by battery 38 open-circuit voltage V battery 38 open-circuit voltage V are the power brick 33 inner internal resistance R of removing
bBoth end voltage V
RbOuter voltage.The voltage relationship of power brick 33 inside is as follows:
V
b＝V-V
Rb
In conjunction with above-mentioned two voltage relationship formulas, the calculating formula that obtains display voltage and be battery 38 open-circuit voltage V is as follows:
V＝V’+V
c+V
Rb
Display voltage is that battery 38 open-circuit voltage V are for detecting voltage V ', power brick internal resistance R
bBoth end voltage V
Rb, loop internal resistance R
cBoth end voltage V
cSum.Because electric current is identical in the electric weight computing circuit, current value is the current value I that measuring and calculating obtains in the electric current estimation circuit 30, and the substitution following formula can obtain:
V＝V’+I·R
c+I·R
b·C
t
The measuring method of this battery electric quantity has not only been considered power brick internal resistance R
bWith loop internal resistance R
cThe voltage that consumes has been considered simultaneously because the battery discharge temperature raises, and the deviation that measuring and calculating brings to the internal resistance of cell makes the open-circuit voltage V of battery 38 more accurate, and then makes the actual motor 11 that supplies make the demonstration of power consumption more accurate.
Program continues to move to the electric weight indication.In electric weight indication, by the electric weight indicating device, as LED or LCD, or boom unit is indicated the situation of the battery dump energy that obtains in the electric weight computing to the user.Preferably multi-colored led herein lamp.Be red and green color LED lamp in the present embodiment, can be shown in red, orange, and green.The battery dump energy value that obtains in the electric weight computing shows green more than or equal to the first default charge value Q1; Preset charge value Q2 when residual electric quantity smaller or equal to second, show red; When residual electric quantity is preset charge value Q1 less than first,, show orange greater than the second default charge value Q2.The first default charge value Q1 is greater than the second default charge value Q2.Preferably, this first default charge value Q1 is that 50%, the second default electric weight Q2 of the total electric weight of battery is 10% of the total electric weight of battery.So, the battery dump energy that different display lamp color is corresponding different, can be clearly to the dump energy situation of user's pilot cell.Green expression Full Charge Capacity, the normal tool using of user; Red expression electric weight deficiency, instrument can not use, and needs charging; Orange expression intermediateness, promptly electric weight is discontented, but instrument also can be used a period of time.After this, program is got back to the judgement to cell voltage, and so circulation is carried out.
The electric weight pilot lamp of different colours can be to user's dump energy situation of pilot cell clearly, and whether the understanding instrument can work, and the time that can work.
In another embodiment, this multi-colored led lamp also can be replaced by many homochromy LED lamps, as the LED lamp of three greens.When dump energy was preset charge value Q1 more than or equal to first, three complete bright, and the expression electric weight is full; When dump energy is preset charge value Q2 smaller or equal to second, only bright one, expression electric weight deficiency; When dump energy less than the first dump energy Q1, during greater than the second default electric weight Q2, two lamps are bright, the expression electric weight state that mediates.
The measuring and calculating of this battery dump energy, flow for displaying, before motor is started working, the parameters of battery is detected judgement, to judge whether the battery situation is fit to support motor to start working, the influence that can avoid the undesired situation because of battery that motor is caused, and the appearance of dangerous situation.After starting working, motor carries out the computing and the demonstration of battery dump energy, and the detection judgement of battery parameters is carried out in circulation, and the computing of dump energy and demonstration, can be in battery operated process the working condition of monitoring battery in real time, make the discharge work of battery safer, the simultaneously actual demonstration that supplies motor to make power consumption makes the indication of dump energy more accurate.
The dump energy display circuit of the electric tool that the present invention discloses is not limited to described content of above embodiment and the represented structure of accompanying drawing.The change of on the basis of invention, components and parts wherein being made apparently, substitute or revise, all within the scope of protection of present invention.
Claims (17)
1. an electric tool control circuit comprises
One is electrically connected, comprises the voltage V ' between two measurement points measuring the power brick two ends and detects the power brick testing circuit of battery temperature with power brick,
One according to the detected power brick both end voltage of testing circuit value computing obtains the battery electric quantity operation result, and controls arithmetic control circuit to the power supply of motor in conjunction with the power brick temperature at least, wherein the battery electric quantity operation result is power brick open-circuit voltage V,
This electric tool control circuit also comprises
One is used to show the electric weight indicating circuit of this electric weight operation result,
One is used to calculate the electric current estimation circuit of electric current I of motor of flowing through,
It is characterized in that the electric weight operation result of this arithmetic control circuit also comprises the inner and loop institute power consumption pressure of power brick.
2. electric tool control circuit as claimed in claim 1 is characterized in that, this an electric weight operation result and a power brick temperature coefficient C
tBe directly proportional.
3. electric tool control circuit as claimed in claim 2 is characterized in that, this power brick temperature coefficient C
tIt is a constant constant.
4. electric tool control circuit as claimed in claim 1 is characterized in that, this power brick has a power brick internal resistance R
b, between two measurement points and power brick two ends, have loop internal resistance R
c
5. electric tool control circuit as claimed in claim 2 is characterized in that, the calculating formula of this power brick open-circuit voltage V is V=V '+IR
c+ IR
bC
t
6. electric tool electric energy control circuit as claimed in claim 1 is characterized in that this arithmetic control circuit comprises the CPU that is used to carry out computing.
7. electric tool electric energy control circuit as claimed in claim 1 is characterized in that this arithmetic control circuit comprises the MCU that is used to carry out computing.
8. electric tool electric energy control circuit as claimed in claim 1 is characterized in that this electric weight indicating circuit comprises the electric weight indicating device.
9. electric tool electric energy control circuit as claimed in claim 8 is characterized in that this electric weight indicating device is multi-colored led lamp.
10. method of operating electric tool, this electric tool comprises the casing that is supporting motor, switch, and electric weight indicating device, the method includes the steps of:
Press switch, so that motor and battery are electrically connected;
Measure the parameter of battery, and control the operation of motor thus or stop;
Behind the motor operation, carry out the electric weight computing;
The electric weight operation result is shown on the electric weight indicating device.
11. the method for operation electric tool as claimed in claim 10 is characterized in that, this electric weight operation result comprises represents the battery dump energy status signals;
12. the method for operation electric tool as claimed in claim 10 is characterized in that, during motor operation, shows current electric weight operation result on this electric weight indicating device.
13. the method for operation electric tool as claimed in claim 10 is characterized in that, this method gives a warning when also being included in the battery overcurrent.
14. the method for operation electric tool as claimed in claim 10 is characterized in that, this method gives a warning when also being included in the battery excess temperature.
15. the method as claim 13 or 14 described operation electric tools is characterized in that, this gives a warning to comprise and actuates lighting pilot lamp.
16. the method for operation electric tool as claimed in claim 10 is characterized in that, this method also is included in cell voltage and crosses and motor is stopped when low.
17. the method for operation electric tool as claimed in claim 10 is characterized in that, this electric weight indicating device is multi-colored led lamp.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104111368A (en) * | 2014-07-24 | 2014-10-22 | 苏州淮通电气有限公司 | Motor with energization alarming function |
| CN105529505A (en) * | 2014-09-30 | 2016-04-27 | 南京德朔实业有限公司 | Battery pack and electric quantity display method thereof |
| CN109959870A (en) * | 2017-12-21 | 2019-07-02 | 南京德朔实业有限公司 | Diagnostic device, diagnostic system and diagnostic method suitable for tool system component |
| CN110752801A (en) * | 2019-10-18 | 2020-02-04 | 峰岹科技（深圳）有限公司 | Grass trimmer control method and device and grass trimmer |
| CN110907842A (en) * | 2019-12-02 | 2020-03-24 | 深圳市欧瑞博科技有限公司 | Intelligent door lock electric quantity detection device and method and intelligent door lock |
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| CN1661847A (en) * | 2004-02-25 | 2005-08-31 | 明基电通股份有限公司 | Battery of possessing function for displaying surplus energy and method |
| CN102279365A (en) * | 2010-06-09 | 2011-12-14 | 南京德朔实业有限公司 | Electric tool control circuit and operation method thereof |
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Application publication date: 20111214 |