CN102570398A - Current-limiting delay protection circuit of lithium battery charge drill - Google Patents
Current-limiting delay protection circuit of lithium battery charge drill Download PDFInfo
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- CN102570398A CN102570398A CN2010106208999A CN201010620899A CN102570398A CN 102570398 A CN102570398 A CN 102570398A CN 2010106208999 A CN2010106208999 A CN 2010106208999A CN 201010620899 A CN201010620899 A CN 201010620899A CN 102570398 A CN102570398 A CN 102570398A
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Abstract
The invention relates to the technical field of supply circuits, in particular relates to a current-limiting delay protection circuit of a lithium battery charge drill, which comprises a lithium battery, a switch control, a current sampling module, a signal amplifying module and a microprocessor which are sequentially connected in series, wherein the current sampling module and the microprocessor are electronically connected with a driving circuit module, the output end of the driving circuit module is electronically connected with a motor, and the lithium battery and the switch control are electronically connected with the microprocessor after passing through a temperature/voltage and control signal generator. The current-limiting delay protection circuit has a simple and scientific structure design; the current is fed back in the circuit, a driving circuit is controlled through the microprocessor, so as to realize limiting of maximum current of the motor, and the current-limiting delay protection circuit is turned on or off within a certain time after reaching the maximum current, so that the effect of protecting the motor and the battery is achieved, meanwhile, the drill is powerful, and the current-limiting delay protection circuit has long service life.
Description
Technical field:
The present invention relates to the power supply circuits technical field, refer in particular to lithium cell charging and bore current limliting delay protection circuit.
Background technology:
At present, lithium battery applications is not generally done current monitoring to lithium battery on the electric tool electric hand drill; Only protect the motor of battery and electric hand drill,, cause unable at once stopping operating if when bit freezing appears in electric hand drill through detecting lithium battery voltage and temperature; Perhaps do not stop operating during bit freezing; Cause burn-down of electric motor, give to use and all cause very burden, product is not long useful life.
Summary of the invention:
The objective of the invention is deficiency, and provide lithium cell charging to bore current limliting delay protection circuit, the simple science of its structural design to prior art; Current feedback in the circuit through the microprocessor control Driver Circuit, realizes restriction motor maximum current; And after reaching maximum current, close down in the certain hour, play protection motor and battery, simultaneously; Can not feel that electric drill does not have power, long product lifecycle yet.
For realizing above-mentioned purpose; The present invention adopts following technical scheme; It comprises lithium battery, switch control, current sample module, signal amplification module, microprocessor, drive circuit module, motor; Lithium battery, switch control, current sample module, signal amplification module, microprocessor are connected successively; Wherein current sample module, microprocessor are electrically connected with drive circuit module, and the drive circuit module output is electrically connected with motor, and lithium battery, switch control are passed through to be electrically connected with microprocessor after temperature/voltage, the control-signals generator.
Described signal amplification module is a microprocessor input current intelligence sample.
Described microprocessor is electrically connected with the input of drive circuit module through the mode of pulse-width modulation.
Beneficial effect of the present invention is: lithium battery, switch control, current sample module, signal amplification module, microprocessor are connected successively, and wherein current sample module, microprocessor are electrically connected with drive circuit module, and the drive circuit module output is electrically connected with motor; Lithium battery, switch control are passed through to be electrically connected with microprocessor after temperature/voltage, the control-signals generator; The simple science of its structural design, current feedback in the circuit is through the microprocessor control Driver Circuit; Realize restriction motor maximum current; And after reaching maximum current, close down in the certain hour, play protection motor and battery, simultaneously; Can not feel that electric drill does not have power, long product lifecycle yet.
Description of drawings:
Fig. 1 is a circuit working principle schematic of the present invention;
Fig. 2 is a control flow block diagram of the present invention;
Fig. 3 is system's when operation of control flow of the present invention, the change procedure sketch map of each parameter.
Embodiment:
See that Fig. 1 is to shown in Figure 3: the present invention includes it and comprise lithium battery 1, switch control 2, current sample module 3, signal amplification module 4, microprocessor 5, drive circuit module 6, motor 7; Lithium battery 1, switch control 2, current sample module 3, signal amplification module 4, microprocessor 5 are connected successively; Wherein current sample module 3, microprocessor 5 are electrically connected with drive circuit module 6; Drive circuit module 6 outputs are electrically connected with motor 7, and lithium battery 1, switch control 2 are electrically connected with microprocessor 5 through temperature/voltage, control-signals generator 8 backs.
Described signal amplification module 4 is microprocessor 5 input current intelligence samples.
Described microprocessor 5 is electrically connected with the input of drive circuit module 6 through the mode of pulse-width modulation.
Lithium battery 1 is made current sample to adding high-power constantan resistance between the drive circuit module 6, and passes through operational amplifier faint current sample, and through 4 voltage amplifications of signal amplification module, supplies microprocessor 5 (single-chip microcomputer) to handle; When sample rate current reaches limits value, microprocessor 5 reduces operating current to limit value through the pulsewidth that reduces drive circuit, and behind current limit work certain hour, stops.Be unlikely to receive too big rush of current with the protection dynamo battery.
Circuit of the present invention is by a switch control 2 control general supplies, and this switch control 2 comprises the stroke potentiometer.The voltage Vr of this potentiometer output delivers to microprocessor 5, and thermistor is contained in lithium battery 1 inside, and thermistor obtains voltage Vt through the resistor network coupling and delivers to microprocessor 5; The voltage resistance network dividing potential drop of lithium battery 1 obtains Vbat and delivers to microprocessor 5; Circuit is made current sample at lithium battery 1 to adding high-power constantan resistance between the drive circuit module 6, and delivers to microprocessor 5 to faint current sample voltage amplification through resistor network and operational amplifier (amplification module 4) and handle.Processor through analyzing data, sends pulse-width modulation (PWM) signal to drive circuit after collecting various voltage datas.
Drive circuit mainly is made up of high-power FET and high-power fly-wheel diode.High-power FET receives that pulse-width modulation (PWM) signal is good, converts powerful pulse width modulation electrical current to and supplies with motor 7; In the time that FET turn-offs, high-power fly-wheel diode plays the effect of afterflow, improves the efficient of control.
Fig. 2 is a control flow work sketch map of the present invention, and operation principle is following: this electric routing switch control 2 startings, to open when switch control 2, and switch is just to circuit supply.
The first step, microprocessor 5 are through the resistor network sampling, and the voltage of lithium battery 1 and the temperature information of lithium battery 1 are collected in analog digital conversion work such as (AD).Too high when the temperature of lithium battery 1, temperature detection is malfunctioning, under the situation of lithium battery 1 brownout, just get into the protection locking mode at once.Under this pattern, the control that microprocessor 5 turn-offs drive circuit module 6 is closed up to switch, stops till the entire circuit power supply.
If all within normal range (NR), microprocessor will continue the stroke value of read switch for the temperature of battery and voltage.Obtain the control numerical value Pn of a pulsewidth body modulation (PWM) through scale operation.
Then microprocessor 5 continues to read the value through the sample rate current that amplifies, because this numerical value performance is unstable, adds up, asks average scheduling algorithm to obtain a stable real-time current Ar so will pass through.
Next step will compare little processing .5 real-time current Ar and whether reach maximum current constant A max, and under the situation of Ar greater than Amax, the Pr value that reduces pulse-width modulation (PWM) falls in microprocessor, and start timer Ta and note down the time that Ar approximates Amax.
If under the situation of real-time current Ar less than Amax, microprocessor judges that further whether the instantaneous value Pr of pulse-width modulation (PWM) is less than control numerical value Pn, if Pr increases the Pr value of pulse-width modulation (PWM) less than microprocessor under the situation of Pn.
Next, whether microprocessor 5 inspection timer Ta are greater than current work time constant Tmax the most greatly, if Ta greater than under the Tmax situation, then gets into the protection locking mode.
At last, whether electric current Ar was less than big current constant Ab when microprocessor 5 compared, and big current constant Ab is more smaller than maximum current constant A max.If under the situation of real-time current Ar less than big current constant Ab, 5 of microprocessors are the timer zero clearing, and stop timing.Entire process is recycled to here and finishes, and microprocessor 5 will restart from the first step, the process of whole circulation at several milliseconds with interior completion.
Illustrate below, embodiment is following:
The change procedure of each parameter when Fig. 3 is the operation of this system.
At first, Pr is zero because electric current Ar less than Amax, so Pr is increased to Pn at short notice, is a running current in time district T1, owing to electric current Ar less than Amax, the Pr value also is not less than the Pn value, so Pr remains Pn always.
On time district T2, stuck in electric drill, electric current Ar rises in moment and surpasses Amax, and Ta picks up counting; The Pr value reduces, and after the Pr value reduces, at this moment electric current Ar descends and opens less than Amax; Because Pr value is also less than the Pn value, so Pr is worth increase once more, electric current Ar rising and greater than Amax.Circulation so always, electric current Ar is faint fluctuation under Amax.
On time district T3, electric hand drill unclamps, and electric current Ar is reduced to less than the Ab value, Ta zero clearing at this moment, and stop timing.Because electric current Ar is less than Amax, the Pr value just stops up to this time period end so the Pr value is increased to the Pn value always less than the Pn value, and Pr remains Pn always.
On time district T4, electric hand drill is stuck once more, and electric current Ar rises in moment and surpasses Amax, and Ta picks up counting, and under the modulation to the Pr value, electric current Ar is faint fluctuation under Amax.After the Ta timing reached Tmax, system got into the protection locking mode, and Pr is constant to be 0, and making output current is 0, and the Ta zero clearing also stops counting.
The above only is preferred embodiment of the present invention, so all equivalences of doing according to the described structure of patent claim of the present invention, characteristic and principle change or modify, includes in patent claim of the present invention.
Claims (3)
1. lithium cell charging bores current limliting delay protection circuit; It comprises lithium battery (1), switch control (2), current sample module (3), signal amplification module (4), microprocessor (5), drive circuit module (6), motor (7); It is characterized in that: lithium battery (1), switch control (2), current sample module (3), signal amplification module (4), microprocessor (5) are connected successively; Wherein current sample module (3), microprocessor (5) are electrically connected with drive circuit module (6); Drive circuit module (6) output is electrically connected with motor (7), and lithium battery (1), switch control (2) are electrically connected with microprocessor (5) through temperature/voltage, control-signals generator (8) back.
2. lithium cell charging according to claim 1 bores current limliting delay protection circuit, and it is characterized in that: described signal amplification module (4) is microprocessor (a 5) input current intelligence sample.
3. lithium cell charging according to claim 1 bores current limliting delay protection circuit, and it is characterized in that: described microprocessor (5) is electrically connected with the input of drive circuit module (6) through the mode of pulse-width modulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106208999A CN102570398A (en) | 2010-12-27 | 2010-12-27 | Current-limiting delay protection circuit of lithium battery charge drill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106208999A CN102570398A (en) | 2010-12-27 | 2010-12-27 | Current-limiting delay protection circuit of lithium battery charge drill |
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| Publication Number | Publication Date |
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| CN102570398A true CN102570398A (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010106208999A Pending CN102570398A (en) | 2010-12-27 | 2010-12-27 | Current-limiting delay protection circuit of lithium battery charge drill |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103331736A (en) * | 2013-06-21 | 2013-10-02 | 太仓市旭冉机械有限公司 | Electric multipurpose hardware tool |
| CN104518484A (en) * | 2013-09-30 | 2015-04-15 | 浙江海王电器有限公司 | Electronic protection device for drilling machine, handheld drilling machine and bench type drilling machine |
| CN104659754A (en) * | 2013-11-20 | 2015-05-27 | 诺基亚公司 | Adaptive battery protection |
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| US6252752B1 (en) * | 1999-02-05 | 2001-06-26 | Tsubakimoto Chain Co. | Overload protection apparatus and a speed reducer having such an apparatus |
| CN1322050A (en) * | 2000-04-28 | 2001-11-14 | 索尼公司 | Cell assembly and signal sending system |
| CN201069856Y (en) * | 2007-06-13 | 2008-06-04 | 湖南巨汇科技发展有限公司 | An intelligent power-saving protection device for electromotor |
| CN101256910A (en) * | 2007-03-01 | 2008-09-03 | 苏州宝时得电动工具有限公司 | Switch of electric tool and electric tool using the switch |
| CN201601648U (en) * | 2009-12-21 | 2010-10-06 | 浙江师范大学 | High power sensor-less vector controller for electric vehicle |
| CN201918710U (en) * | 2010-12-27 | 2011-08-03 | 东莞市妙达电动工具制造有限公司 | Current-limiting time-delay protection circuit for lithium battery charging drill |
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2010
- 2010-12-27 CN CN2010106208999A patent/CN102570398A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6252752B1 (en) * | 1999-02-05 | 2001-06-26 | Tsubakimoto Chain Co. | Overload protection apparatus and a speed reducer having such an apparatus |
| CN1322050A (en) * | 2000-04-28 | 2001-11-14 | 索尼公司 | Cell assembly and signal sending system |
| CN101256910A (en) * | 2007-03-01 | 2008-09-03 | 苏州宝时得电动工具有限公司 | Switch of electric tool and electric tool using the switch |
| CN201069856Y (en) * | 2007-06-13 | 2008-06-04 | 湖南巨汇科技发展有限公司 | An intelligent power-saving protection device for electromotor |
| CN201601648U (en) * | 2009-12-21 | 2010-10-06 | 浙江师范大学 | High power sensor-less vector controller for electric vehicle |
| CN201918710U (en) * | 2010-12-27 | 2011-08-03 | 东莞市妙达电动工具制造有限公司 | Current-limiting time-delay protection circuit for lithium battery charging drill |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103331736A (en) * | 2013-06-21 | 2013-10-02 | 太仓市旭冉机械有限公司 | Electric multipurpose hardware tool |
| CN104518484A (en) * | 2013-09-30 | 2015-04-15 | 浙江海王电器有限公司 | Electronic protection device for drilling machine, handheld drilling machine and bench type drilling machine |
| CN104518484B (en) * | 2013-09-30 | 2018-03-13 | 浙江海王电器有限公司 | Drilling machine electronic protection, hand-held drilling machine and bench type drilling machine |
| CN104659754A (en) * | 2013-11-20 | 2015-05-27 | 诺基亚公司 | Adaptive battery protection |
| CN104659754B (en) * | 2013-11-20 | 2019-01-04 | 诺基亚技术有限公司 | Adaptive battery protection |
| US10291013B2 (en) | 2013-11-20 | 2019-05-14 | Nokia Technologies Oy | Adaptive battery protection |
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Application publication date: 20120711 |