CN201918710U - Current-limiting time-delay protection circuit for lithium battery charging drill - Google Patents
Current-limiting time-delay protection circuit for lithium battery charging drill Download PDFInfo
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- CN201918710U CN201918710U CN2010206810118U CN201020681011U CN201918710U CN 201918710 U CN201918710 U CN 201918710U CN 2010206810118 U CN2010206810118 U CN 2010206810118U CN 201020681011 U CN201020681011 U CN 201020681011U CN 201918710 U CN201918710 U CN 201918710U
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Abstract
The utility model relates to the technical field of power supply circuits, in particular to a current-limiting time-delay protection circuit for a lithium battery charging drill. A lithium battery, a switch controller, a current sampling module, a signal amplifying module and a microprocessor are sequentially connected in series, wherein the current sampling module and the microprocessor are electrically connected with a driving circuit module; the output end of the driving circuit module is electrically connected with a motor; and the lithium battery and the switch controller are electrically connected with the microprocessor after passing through a temperature/voltage control signal generator. The protection circuit has simple and scientific structural design, the current feedback is realized in the circuit, the highest current of the motor is limited by controlling the driving circuit through the microprocessor, the motor is shut down within a period of time after reaching the highest current, so as to protect the motor and the battery; meanwhile, the drill is robust, and the service life of the product is long.
Description
Technical field:
The utility model relates to the power supply circuits technical field, refers in particular to lithium cell charging and bores current limliting delay protection circuit.
Background technology:
At present; lithium battery applications is on the electric tool electric hand drill; generally lithium battery is not done current monitoring; 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 by 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.
The utility model content:
The purpose of this utility model is at the deficiencies in the prior art; and provide lithium cell charging to bore current limliting delay protection circuit; the simple science of its structural design, current feedback in the circuit is by 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.
For achieving the above object, the utility model 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, 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 by the mode of pulse-width modulation.
The utility model beneficial effect is: lithium battery; switch control; the current sample module; the signal amplification module; microprocessor is connected successively; current sample module wherein; microprocessor is electrically connected with drive circuit module; the drive circuit module output is electrically connected with motor; lithium battery; temperature/voltage is passed through in switch control; be electrically connected with microprocessor after the control-signals generator; the simple science of its structural design; current feedback in the circuit; by 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 utility model;
Fig. 2 is a control flow block diagram of the present utility model;
Fig. 3 is system's when operation of the utility model control flow, the change procedure schematic diagram of each parameter.
Embodiment:
See that Fig. 1 is to shown in Figure 3: the utility model comprises that it comprises 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 by 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 by the mode of pulse-width modulation.
The utility model circuit 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 by 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 by resistor network and operational amplifier (amplification module 4) microprocessor 5 is delivered in faint current sample voltage amplification and handled.Processor is after collecting various voltage datas, and data send pulse-width modulation (PWM) signal to drive circuit by analysis.
Drive circuit mainly is made 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 field effect transistor is turn-offed, high-power fly-wheel diode plays the effect of afterflow, improves the efficient of control.
Fig. 2 is a control flow work schematic diagram of the present utility model, and operation principle is as follows: 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 by 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 enter 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, so will be through adding up, ask average scheduling algorithm to obtain a stable real-time current Ar.
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, microprocessor 5 checks that timer Ta are whether greater than current work time constant Tmax the most greatly, if Ta then enters the protection locking mode greater than under the Tmax situation.
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, and the process of whole circulation is finished with interior at several milliseconds.
Illustrate below, embodiment is as follows:
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, electric hand drill is stuck, and electric current Ar rises in moment and surpasses Amax, and Ta picks up counting, the Pr value reduces, after Pr value reduces, and electric current Ar decline and less than Amax, at this moment, 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 entered 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 utility model, so all equivalences of doing according to the described structure of the utility model patent claim, feature and principle change or modify, is included in the utility model patent claim.
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) is connected successively; current sample module (3) wherein; microprocessor (5) is electrically connected with drive circuit module (6); drive circuit module (6) output is electrically connected with motor (7), lithium battery (1); temperature/voltage is passed through in switch control (2); control-signals generator (8) back is electrically connected with microprocessor (5).
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) by the mode of pulse-width modulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206810118U CN201918710U (en) | 2010-12-27 | 2010-12-27 | Current-limiting time-delay protection circuit for lithium battery charging drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206810118U CN201918710U (en) | 2010-12-27 | 2010-12-27 | Current-limiting time-delay protection circuit for lithium battery charging drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201918710U true CN201918710U (en) | 2011-08-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206810118U Expired - Fee Related CN201918710U (en) | 2010-12-27 | 2010-12-27 | Current-limiting time-delay protection circuit for lithium battery charging drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201918710U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570398A (en) * | 2010-12-27 | 2012-07-11 | 东莞市妙达电动工具制造有限公司 | Current-limiting delay protection circuit of lithium battery charge drill |
| EP2979791A4 (en) * | 2013-03-29 | 2016-11-02 | Nitto Kohki Co | Battery-powered drill |
| CN109434763A (en) * | 2018-11-29 | 2019-03-08 | 国网江苏省电力有限公司盐城供电分公司 | A kind of control system and its control method of electric hand drill |
-
2010
- 2010-12-27 CN CN2010206810118U patent/CN201918710U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570398A (en) * | 2010-12-27 | 2012-07-11 | 东莞市妙达电动工具制造有限公司 | Current-limiting delay protection circuit of lithium battery charge drill |
| EP2979791A4 (en) * | 2013-03-29 | 2016-11-02 | Nitto Kohki Co | Battery-powered drill |
| CN109434763A (en) * | 2018-11-29 | 2019-03-08 | 国网江苏省电力有限公司盐城供电分公司 | A kind of control system and its control method of electric hand drill |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110803 Termination date: 20161227 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |