CN202565762U - Li-battery cropper - Google Patents
Li-battery cropper Download PDFInfo
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- CN202565762U CN202565762U CN 201220166052 CN201220166052U CN202565762U CN 202565762 U CN202565762 U CN 202565762U CN 201220166052 CN201220166052 CN 201220166052 CN 201220166052 U CN201220166052 U CN 201220166052U CN 202565762 U CN202565762 U CN 202565762U
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Abstract
The utility model discloses a Li-battery cropper which comprises a motor driving a cutting blade. The motor is connected with a control system which is connected with a power supply. The motor is a direct current motor, the power supply is a Li-battery pack, and the direct current motor is connected with the Li-battery pack through the control system. Li-batteries and the direct current motor are applied to the cropper so that the Li-batteries can adapt to special situations of the cropper, namely the special situation of interval use, and meet conservation requirements for energy conservation and energy of current markets. The Li-battery cropper adopts a soft starting circuit, the current gradually increases from small to big when the motor is just started, so that damage to the motor and a control panel can be avoided, and service life is prolonged. The current increases to be maximum under a loading condition so that operating requirements are met, energy conservation is achieved, and simultaneously noise is greatly reduced. The Li-battery cropper adopts a power supply self-latch circuit, power supplying for the control panel is cut off when a master control chip does not work to enable energy consumption of the control panel to be low, and the current in a non-working state is only 2mu A.
Description
Technical field
The utility model relates to a kind of garden instrument, is a kind of lithium electricity mower specifically.
Background technology
External mower commonly used generally is gasoline type mower and electrodynamic type mower.The gasoline type mower can produce waste gas, and in the Europe of advocating energy-saving and environmental protecting, it is the electrodynamic type mower with clean energy-saving that people are more prone to.Prior electric formula mower generally uses alternating current, needs to use electric wire and domestic power supply to connect, and owing to the use of electric wire, has limited the working range of mower, and the flexibility of using.Use lead-acid battery to supply power in addition, but, therefore also progressively eliminating because the manufacturing of lead-acid battery pollutes the environment.
Continuous development along with electric tool, garden instrument industry; Abroad; Home-use electronic and wirelessization of garden instrument, portability gradually become trend; Lithium electricity kind tool also more and more receives abroad consumer's welcome, and lithium battery is a kind of light novel power supply mode, uses in a plurality of fields such as electric motor cars.Yet there is following deficiency in the use in the lithium electric tool: receive the restriction of battery capacity, be restricted service time; And, certainly will increase the volume and the weight of machine if increase battery capacity, influence has also increased cost greatly in the time of portable.
Lithium electricity application of power to the garden mower the time, is being run into the problems referred to above equally.During consumer choice family expenses garden mower, except considering price, the quality of machine, practicality and ease for use also are to consider.At present, external lithium electricity mower generally uses 36V, and the lithium electricity battery of 2.6Ah is as power supply; Once about sustainable mowing about 220m2 in level ground after completely filling uses though can satisfy most of family, also has part family need cut more large-area lawn; After electric quantity consumption finishes; Have only Halfway Stopping, again electricity is full of just and can reuses, directly influenced consumer's use experience.Address this problem, have only two schemes, one, reduce battery power consumption, improve the battery service efficiency, thereby improve the service time after the once charging; Two, increase battery capacity prolonging battery service time, but this scheme is said as starting, and certainly will increase the volume and the weight of machine, influence ease for use, the while has also increased cost greatly, and being doomed does not have market.
Therefore, how under the conventional battery capacity conditions, reduce invalid energy consumption, the single service time (mowing area) of improving mower, become the technical problem of necessary solution.In addition, because the use seasonality of garden instrument is stronger, all be in the state of shelving whole winter, and the characteristic of lithium battery can produce power consumption equally under static condition, cause lithium battery voltage slowly to reduce, until under-voltage.Long-term under-voltagely will inevitably influence the lithium battery life-span, even cause losing efficacy.Therefore, manage to reduce the lithium battery quiescent dissipation, prolonging lithium battery service life also is the task of top priority.
Summary of the invention
Goal of the invention: the purpose of the utility model is to overcome the deficiency of prior art, and a kind of lithium electricity mower that uses lithium battery power supply is provided.
In order to solve the problems of the technologies described above, the utility model has adopted following technical scheme:
A kind of lithium electricity mower, it comprises the motor that drives cutting blade, and motor links to each other with the control system, and the control system links to each other with power supply; Described motor is a direct current generator, and described power supply is the lithium battery group, and direct current generator links to each other with the lithium battery group through the control system; Described control system comprises: the main control chip: be used for receiving and handle various data, and information is sent to interlock circuit; The single battery tension measuring circuit: be used for measuring the single battery voltage of lithium battery group, and constantly send each single battery magnitude of voltage to the main control chip, the main control chip judges whether to occur overcharging, cross put or single battery between the excessive phenomenon of pressure reduction; Temperature measuring circuit: be used to measure the temperature of lithium battery group, and temperature information is constantly fed back to the main control chip, the main control chip judges that the lithium battery group is whether in the normal working temperature scope; LED capacity display circuit: be used to show current lithium battery group residual capacity; PWM adjusts circuit: be used to control a discharge switch pipe Q1 and No. two discharge switch pipe Q2, and control brake switch pipe Q3; Discharge current testing circuit: be used to measure the discharge current of lithium battery group, and this current value is exported to the main control chip; Charging control switch: be used to control opening and turn-offing of charge circuit; Discharge trigger switch: be used for detecting whether to open a discharge switch pipe Q1 and No. two discharge switch pipe Q2; The input of single battery tension measuring circuit is connected to the both positive and negative polarity of each battery of lithium battery group, and the output of single battery tension measuring circuit links to each other with the input of main control chip; The input of temperature measuring circuit links to each other with the both positive and negative polarity of lithium battery group, and the output of temperature measuring circuit links to each other with the input of main control chip; The main control chip also links to each other with LED capacity display circuit, PWM adjustment circuit, discharge current testing circuit, discharge trigger switch respectively; The output of PWM adjustment circuit is connected in parallel to discharge switch pipe Q1, No. two discharge switch pipe Q2 and brake switch pipe Q3, another termination discharge negative pole of discharge switch pipe Q1, No. two discharge switch pipe Q2 and brake switch pipe Q3; The input of discharge current testing circuit is connected in the two ends of resistance R 1, resistance R 2 in parallel, and respectively as the both positive and negative polarity of current sampling; Another termination firing switch of discharge trigger switch; Main control chip, lithium battery group positive pole all link to each other with charging control switch; Charging is anodal, the discharge negative pole links to each other with charger circuit respectively.
Wherein, described control system also comprises the linear voltage decreasing circuit that voltage stabilizing is used, and is used to control linear reduction voltage circuit, and then the power supply supply of control The whole control system power supply is from latching circuit; Described power supply supply is from latching circuit when the main control chip is not worked, and the power supply supply is closed from latching circuit, and then is cut to the main control chip power supply; When the main control chip operation, opening power is whole control circuit system power supply from latching circuit; The source supply links to each other with the main control chip from the input that latchs circuit, and the power supply supply links to each other with the input of linear voltage decreasing circuit from the output that latchs circuit, and the output of linear voltage decreasing circuit is anodal with the lithium battery group respectively, the main control chip links to each other.
Wherein, described control system also comprises the charge balancing circuit that is used for adjusting each single battery balance of voltage of lithium battery group, and the input of charge balancing circuit is connected between the both positive and negative polarity of each single battery of lithium battery group; In charging process; When if pressure reduction appears in the voltage of main control chip detection single battery in the lithium battery group; The charge balancing circuit can be according to the result of main control chip feedback, the battery discharge the highest to voltage, and then make the voltage of each battery of lithium battery group reach balance.
Wherein, the pressure reduction between the voltage of single battery is during more than or equal to 50mV, and the charge balancing circuit discharges to the highest single battery of voltage, and the pressure reduction between the minimum single battery of the highest single battery of voltage and voltage is less than 50mV.
Wherein, described single battery tension measuring circuit has comprised the FET Q4 of electronics on-off action, carries out the computing amplification appliance U1A of voltage adjustment, difference amplification; One end of resistance R 3 links to each other with the positive pole of single battery, and the other end links to each other with 6 pin of FET Q4; 3 pin of FET Q4 link to each other with resistance R 4, and the other end of resistance R 4 is connected to the negative pole of single battery; 1 pin of FET Q4 links to each other with 3 pin of resistance R 5, computing amplification appliance U1A, and the other end of resistance R 5 is connected to power cathode; 4 pin of FET Q4 link to each other with 2 pin of resistance R 6, computing amplification appliance U1A, and the other end of resistance R 6 is connected to 1 pin of computing amplification appliance U1A; 1 pin of computing amplification appliance U1A links to each other with resistance R 7, resistance R 8 again, and the other end of resistance R 7 links to each other with capacitor C 1, and the other end of capacitor C 1 links to each other with the other end of resistance R 8 and is connected to the negative pole of power supply, the voltage of AN1 end output single battery.
Wherein, Described PWM adjustment circuit comprises adjustment chip U7, and 2 pin, 3 pin of adjustment chip U7 link to each other with the output of main control chip through resistance R 14, and 1 pin of adjustment chip U7 connects positive pole, the capacitor C 3 of diode D5 respectively; The other end ground connection of capacitor C 3; The negative pole of diode D5 connects the 8th pin and the capacitor C 4 of adjustment chip U7, and the other end of capacitor C 4 is connected to resistance R 15 and lead-out terminal Moto-, 6 pin of resistance R 15 another termination adjustment chip U7; 7 pin of adjustment chip U7 connect the positive pole of diode D6 and the base stage of transistor Q6; The negative pole of diode D6 extremely links to each other with the G of the emitter stage of transistor Q6, resistance R 16, brake switch pipe Q3 respectively, and the colelctor electrode of transistor Q6 links to each other with resistance R 16, the S utmost point of brake switch pipe Q3, lead-out terminal Moto-respectively, is used to control that motor is anxious stops braking; 5 pin of adjustment chip U7 are connected to the base stage of positive pole and the transistor Q5 of diode D7; The negative pole of diode D7 is connected with the emitter stage of transistor Q5, resistance R 17, the G utmost point of a discharge switch pipe Q1, the G utmost point of No. two discharge switch pipe Q2 respectively; The S utmost point of the S utmost point of the other end of the colelctor electrode of transistor Q5, resistance R 17, a discharge switch pipe Q1, No. two discharge switch pipe Q2 connects power cathode, is used to control the PWM adjustment function of a discharge switch pipe Q1 and No. two discharge switch pipe Q2; The D utmost point of the D utmost point of a discharge switch pipe Q1, No. two discharge switch pipe Q2 links to each other with lead-out terminal Moto-, and the D utmost point of brake switch pipe Q3 meets lead-out terminal Moto+; Lead-out terminal Moto+, Moto-are connected respectively to the both positive and negative polarity of motor, realize the function of PWM adjustment circuit.
Wherein, it comprises that also charging temperature probe, the described charging temperature end of popping one's head in links to each other with the main control chip, and the other end links to each other with charger circuit.
Normal range of operation when wherein, described lithium battery group is charged is 0～45 ℃; Normal range of operation during discharge is-10～65 ℃.
Beneficial effect: (1) the utility model is applied in lithium battery and direct current generator on the mower, makes lithium battery can adapt to the special circumstances of mower, i.e. the special circumstances of interval property use meet current market energy conservation and environment protection.
(2) the utility model adopts soft starting circuit, when electromotor just starts, makes electric current ascending, progressively increases, and avoids motor and control panel are damaged, and has prolonged service life; Under loading condition, electric current increases to maximum, has both satisfied instructions for use, and is energy-conservation again, greatly reduces noise simultaneously.
(3) the utility model adopts power supply from latching circuit, when the main control chip is not worked, cuts off the control panel power supply, makes the control panel energy consumption extremely low, and the electric current of off working state has only 2uA.
(4) the discharge trigger switch of the utility model is sent out a triggering signal earlier and is given the main control chip; By main control chip controls PWM adjustment circuit start motor; Only need little electric current can trigger the main control chip; And then trigger mower work, avoid big electric current cabling through long cabling, and the selection of starting switch is brought convenience.
Description of drawings
Fig. 1 is the schematic block circuit diagram of the control system of the utility model
Fig. 2 is the single battery tension measuring circuit figure of the utility model
Fig. 3 is the PWM adjustment circuit of the utility model
Fig. 4 is the discharge current testing circuit of the utility model
Fig. 5 is the charger circuit schematic diagram of the utility model
Embodiment:
Below in conjunction with accompanying drawing the utility model is done explanation further.
The lithium electricity mower of the utility model comprises the direct current generator that drives cutting blade, and direct current generator links to each other with the control system, and the control system links to each other with power supply; Described power supply is the lithium battery group, and direct current generator links to each other with the lithium battery group through the control system.Lithium battery group power supply is through control system drive direct current generator, and then the drive cutting blade is mowed.The lithium battery group is to be formed by the lithium battery connection in series-parallel.
Described control system comprises and receives the main control chip 5 of handling various data; The control system of (for example available PIC16F887 chip, U.S. microchip company produces) the utility model also comprises: single battery tension measuring circuit 1, charge balancing circuit 2, linear voltage decreasing circuit 3, power supply supply are from latching circuit 4, temperature measuring circuit 6, LED capacity display circuit 7, PWM adjustment circuit 8, discharge current testing circuit 9, charging control switch 10, discharge trigger switch 11 and charging temperature probe 12.
As shown in Figure 1, the input of single battery tension measuring circuit 1 is connected to the both positive and negative polarity of each batteries of lithium battery group, and the output of single battery tension measuring circuit 1 links to each other with the input of main control chip 5; Charge balancing circuit 2 is connected between the both positive and negative polarity of battery pack single battery; The power supply supply links to each other with main control chip 5 from the input that latchs circuit 4, and the power supply supply links to each other with the input of linear voltage decreasing circuit 3 from the output that latchs circuit 4, and the output of linear voltage decreasing circuit 3 is anodal with the lithium battery group respectively, main control chip 5 links to each other.The input of temperature measuring circuit 6 links to each other with the both positive and negative polarity of lithium battery group, and the output of temperature measuring circuit 6 links to each other with the input of main control chip 5; The output of main control chip 5 also is connected with LED capacity display circuit 7; Main control chip 5 also links to each other with PWM adjustment circuit 8, discharge current testing circuit 9, discharge trigger switch 11 respectively; The output of PWM adjustment circuit 8 is connected in parallel to discharge switch pipe Q1, No. two discharge switch pipe Q2 and brake switch pipe Q3, another termination discharge negative pole of discharge switch pipe Q1, No. two discharge switch pipe Q2 and brake switch pipe Q3; Be connected in parallel the respectively two ends of resistance R 1, resistance R 2 of the input of discharge current testing circuit 9, and respectively as the both positive and negative polarity of sampling current; Discharge trigger switch 11 another termination firing switcies; Main control chip 5, lithium battery group positive pole all link to each other with charging control switch 10; Described charging temperature 12 1 ends of popping one's head in link to each other with main control chip 5, and the other end links to each other with charger circuit; Charging is anodal, the discharge negative pole links to each other with charger circuit respectively.
The input of single battery tension measuring circuit 1 is connected to the both positive and negative polarity of each batteries in the lithium battery group, and the output of single battery tension measuring circuit 1 links to each other with the input of main control chip 5.As shown in Figure 2, described single battery tension measuring circuit 1 has comprised the FET Q4 of electronics on-off action, and the computing amplification appliance U1A that voltage is adjusted, difference is amplified; One end of resistance R 3 links to each other with the positive pole of single battery, and the other end links to each other with 6 pin of FET Q4.2 pin of FET Q4 link to each other with 5 pin, and 3 pin of FET Q4 link to each other with resistance R 4, and the other end of resistance R 4 is connected to the negative pole of single battery.1 pin of FET Q4 links to each other with 3 pin of resistance R 5 with computing amplification appliance U1A, and the other end of resistance R 5 is connected to power cathode.4 pin of FET Q4 link to each other with 2 pin of resistance R 6, computing amplification appliance U1A, and the other end of resistance R 6 is connected to 1 pin of computing amplification appliance U1A.1 pin of computing amplification appliance U1A links to each other with resistance R 7, resistance R 8 again, and the other end of resistance R 7 links to each other with capacitor C 1, and the other end of capacitor C 1 links to each other with the other end of resistance R 8 and is connected to the negative pole of power supply, the voltage of AN1 end output voltage single battery.
The single battery tension measuring circuit 1 of the utility model adopts differential amplifier circuit, has improved certainty of measurement greatly.The certainty of measurement of existing single battery tension measuring circuit is generally positive and negative 50 millivolts, and the certainty of measurement of the utility model is positive and negative 25 millivolts.And the single battery tension measuring circuit 2 of the utility model can break off FET Q4 when not measuring, and reduces and measures power consumption.
In the charge and discharge process; Single battery tension measuring circuit 1 is issued main control chip 5 with the information of voltage of detected single battery; Main control chip 5 is according to the magnitude of voltage that records; Judge whether to overcharge or the phenomenon of over-discharge: when the single battery charging voltage surpasses 4.2V, be and overcharge, when the single battery discharge voltage is lower than 2.7V, be over-discharge.If magnitude of voltage shows the phenomenon that overcharges, then main control chip 5 drives charging control switch 10 disconnections, thereby breaks off charging, and making charge circuit is zero, reaches the additives for overcharge protection purpose.If the over-discharge phenomenon, then main control chip 5 notice PWM adjustment circuit 8 are turned off motor, stop discharge.
The control system of the utility model also comprises the charge balancing circuit 2 that is used to adjust each single battery balance of voltage of lithium battery group; In charging process; The voltage of each single battery that main control chip 5 records according to single battery tension measuring circuit 1; When judging that voltage difference between each single battery is more than or equal to 50mV, need discharge; Charge balancing circuit 2 is according to the result of main control chip 5 feedback, the battery discharge the highest to voltage, and the pressure reduction between the minimum single battery of the highest single battery of voltage and voltage makes the voltage of each battery of battery pack reach balance less than 50mV.
The lithium battery group in use because the uniformity of environmental factor and battery pack, and it is unbalanced to be directed at cell voltage (capacity); And then cause whole cell set capacity to descend; When detecting through single battery tension measuring circuit 1 that single battery voltage is unbalanced in the battery pack, carry out the resistance-type discharge, when discharging into specified equalizing voltage through 2 pairs of batteries that voltage is the highest of charge balancing circuit; Stop discharge, and then make that every batteries reaches balance in the battery pack.
Linear voltage decreasing circuit 3 in the control system is used for voltage stabilizing, and the power supply supply is from latching the power switch that circuit 4 is used to control linear reduction voltage circuit 3, so that the power supply in control The whole control loop.The power supply supply links to each other with main control chip 5 from the input that latchs circuit 4, and the source supply links to each other with the input of linear voltage decreasing circuit 3 from the output that latchs circuit 4, and the output of linear voltage decreasing circuit 3 is anodal with the lithium battery group respectively, main control chip 5 links to each other.
Described power supply supply is closed the power supply supply from latching circuit 4 when main control chip 5 is not worked from latching circuit 4, power switch circuit is closed, and then cut off the power supply of The whole control system; When 5 work of main control chip, opening power is the entire circuit power supply from latching circuit 4.
The utility model also is provided with a charging temperature probe 12, and charging temperature probe 12 is used for when charger charges, detecting lithium battery group temperature, and charger detects this signal of sensor, calculates the temperature of battery pack.Described charging temperature 12 1 ends of popping one's head in link to each other with main control chip 5, and the other end links to each other with the charger chip 17 of charger circuit.
LED capacity display circuit 7 is used to show current battery pack residual capacity, i.e. battery pack current residual voltage.LED capacity display circuit 7 can show the minimum single battery capacity of capacity in the battery pack.Each lithium battery group is to be in series by a plurality of single batteries, and LED capacity display circuit 7 is that the voltage according to the minimum single battery of voltage in the series battery shows.LED capacity display circuit 7 has four display lamps, and after one-touch S1 pressed, three green light D1, D2, D3 showed current battery pack residual capacity, and kept about normal bright 5S; Simultaneously can be according to the capacitance of the minimum single battery of the bright number judgment voltage of green light; For example three minimum single battery dump energies of the complete bright expression voltage of green light are more than 80%; Two minimum single battery dump energies of the bright expression voltage of green light are that 60%, one minimum single battery dump energy of the bright expression voltage of green light is 30%; When battery voltage was crossed low or broken down, an exhibit red D4 of button lamp was bright.
The control system also comprises the charging control switch of opening and turn-offing 10 that is used to control charge circuit; And be used to detect the discharge trigger switch 11 that whether need open a discharge switch pipe Q1 and No. two discharge switch pipe Q2.
The control system of the utility model also comprises and is used to control a discharge switch pipe Q1 and No. two discharge switch pipe Q2; And the PWM adjustment circuit 8 of control brake switch pipe Q3; Be soft starting circuit, during when the discharge end or because of discharge overcurrent protection, discharge overheat protector or short-circuit protection, PWM adjustment circuit 8 turn-offs a discharge switch pipe Q1 and No. two discharge switch pipe Q2; Drive brake switch pipe Q3 simultaneously, the motor braking is suddenly stopped.
Because motor load is an inductive load, traditional Starting mode is that the direct motor two ends of giving add voltage, and motor starts with peak power immediately, and starting current will be the perhaps higher more than 3 times of motor rated current this moment; Owing to be that total power starts, when starting, violent the vibrating of machine meeting possibly produce danger.Therefore total power starts for the electric power system of lithium electricity group pond, and excessive starting current can have great influence to the life-span and the safety of lithium battery.The soft starting circuit of the utility model, i.e. PWM adjustment circuit 8 can overcome the above problems.When main control chip 5 receives enabling signal, can elder generation drive a discharge switch pipe Q1 and No. two discharge switch pipe Q2 with small-power output, this moment, motor was to move earlier than the low speed low-power; The uninterrupted stepless adjustment of PWM width simultaneously; Make motor rotary speed constantly rise up to maximum, during starter, machine does not have violent vibration slowly; And starting current is very little, has effectively protected the safety and the life-span of lithium battery.
When discharge trigger switch 11 sent enabling signal and gives main control chip 5, circuit thought that machine wants normal starting, the heavy current impact and the equipment of lithium battery group was beated suddenly in order to exempt from because of electric motor starting, had adopted soft starting circuit.Said soft starting circuit adopts the mode of PWM (pulse width modulation), and is initial what start, and main control chip 5 is with minimum duty cycle 1% output; 1% duty cycle transmissions drives signal to 8 pairs in PWM adjustment circuit and amplifies and handle; An output discharge switch pipe Q1 of driving and No. two discharge switch pipe Q2 are starting simultaneously with 1% dutycycle conducting again, and the PWM dutycycle of main control chip 5 outputs increases width gradually; Motor speed is promoted gradually; When being promoted to 85% dutycycle, stop the adjustment of PWM dutycycle, start and accomplish; During underload, with the stable output of 85% dutycycle.
After start accomplishing, discharge current testing circuit 9 detects current discharge current value, and with the corresponding different PWM dutycycles of different size of current, when machine works electric current hour, dutycycle is with 85% output, and motor rotary speed reduces, and the energy-conservation while has been reduced noise again; When the machine works electric current changed, the PWM dutycycle was adjusted thereupon, and dutycycle was 100% when electric current was maximum, and this moment, motor rotary speed reached maximum.
As shown in Figure 3; PWM adjustment circuit 8 comprises the adjustment chip U7 that is used to carry out the signal amplification; For example adjust chip U7 and can select the IR2103 cake core for use; Described PWM adjustment circuit 8 comprises adjustment chip U7, and 2 pin, 3 pin of adjustment chip U7 link to each other with the output of main control chip 5 through resistance R 14, and the function of PWM adjustment circuit 8 is mainly accomplished by adjustment chip U7.1 pin of adjustment chip U7 connects capacitor C 3, diode D5 is anodal; The other end ground connection of capacitor C 3; The negative pole of diode D5 connects 8 pin and the capacitor C 4 of adjustment chip U7, and the other end of capacitor C 4 is connected to resistance R 15 and lead-out terminal Moto-, 6 pin of resistance R 15 another termination U7; 7 pin of adjustment chip U7 connect the positive pole of diode D6, the base stage of transistor Q6; The negative pole of diode D6 extremely links to each other with the G of the emitter stage of transistor Q6, resistance R 16, brake switch pipe Q3 respectively; The colelctor electrode of transistor Q6 links to each other with resistance R 16, the S utmost point of brake switch pipe Q3, lead-out terminal Moto-, is used to control motor and suddenly stops braking; 5 pin of adjustment chip U7 are connected to the positive pole of diode D7, the base stage of transistor Q5; The negative pole of diode D7 is connected with the emitter stage of transistor Q5, resistance R 17, the G utmost point of a discharge switch pipe Q1, the G utmost point of No. two discharge switch pipe Q2 respectively; The S utmost point of the S utmost point of the other end of the colelctor electrode of transistor Q5, resistance R 17, a discharge switch pipe Q1, No. two discharge switch pipe Q2 connects power cathode, is used to control the PWM adjustment function of a discharge switch pipe Q1, No. two discharge switch pipe Q2; The D utmost point of the D utmost point of a discharge switch pipe Q1, No. two discharge switch pipe Q2 meets lead-out terminal Moto-, and the D utmost point of brake switch pipe Q3 meets lead-out terminal Moto+; Lead-out terminal Moto+, Moto-are connected respectively to the both positive and negative polarity of motor, realize the function of PWM adjustment circuit.
The utility model also comprises the discharge current testing circuit 9 of the discharge current that is used to measure the lithium battery group; The input of main control chip 5 links to each other with the output of discharge current testing circuit 9, and discharge current testing circuit 9 is measured the discharge current of current electric lithium pond group and exported to main control chip 5, and main control chip 5 judges that electric current reaches discharge overcurrent protection value; And the time reaches guard time; Main control chip 5 outputs signal to PWM adjustment circuit 8, turn-offs a discharge switch pipe Q1 and No. two discharge switch pipe Q2, the circuit of PWM adjustment simultaneously 8 output signal controlling brake switch pipe Q3; Carry out motor brake control, reach the discharge overcurrent protection.
As shown in Figure 4; Discharge current testing circuit 9 comprises testing circuit main control chip U2B; Testing circuit main control chip U2B is an operational amplifier; The 7th output of testing circuit main control chip U2B is connected to the I-in input of main control chip 5 through resistance R 9, is used for the input of 5 pairs of discharge currents of main control chip.Be connected with capacitor C 2 between main control chip 5 and the resistance R 9, the other end ground connection of capacitor C 2.The 5th input of testing circuit main control chip U5B is connected to resistance R 11, and resistance R 11 is connected to the positive pole of the positive pole of resistance R 1, resistance R 2 as current sampling; One end of resistance R 12 is connected to the 5th pin of testing circuit main control chip U5B, the 6th pin of an end connection detection circuit main control chip U5B of resistance R 13, and the other end of resistance R 12, resistance R 13 is connected with resistance R 1, resistance R 2, and as the negative pole of current sampling.Resistance R 10 1 ends are connected to 6 pin of testing circuit main control chip U5B, and the other end is connected to 7 pin of testing circuit main control chip U5B, carry out discharge current and detect.
The utility model also is included as the charger circuit of lithium battery group charging.Described charger circuit adopts switching power circuit and charger chip 17 two parts to form.Switching Power Supply is to change into direct current output to the alternating current of input, and then the lithium battery group is charged; Adopt PWM control, it is little to have a volume, the advantage that efficient is high
Charger circuit comprises:
Electromagnetism anti-jamming circuit 13: in order to suppressing the electromagnetic interference that circuit own produces, and suppress external electromagnetic interference signal;
Contravariant transformer 14: become the charging voltage of setting to the high pressure of input, just become output 42VAC voltage to input 220VAC voltage, electric insulation is isolated;
Current rectifying and wave filtering circuit 15: the DC charging voltage that becomes the voltage of the alternation of contravariant transformer 14 outputs charger;
Gauge tap 16: do charging control switch with relay, when charging is accomplished, turn-off charger and cell circuit, the protection battery; When battery charger failure or battery failures, turn-off charger and cell circuit, the protection battery;
Charger chip 17: detect the voltage that charges in the charging process, the temperature of battery, the parameters such as electric current of charging; Control gauge tap 16; State indication to battery charge; Charging interval control.
Status display circuit 18: the state of indication rechargeable battery, four kinds of states of rechargeable battery: do not connect battery, battery charge completion, battery temperature state, battery fault condition;
Feedback circuit 19: detect voltage, the current signal of current rectifying and wave filtering circuit 15, and detected signal feedback to pwm control circuit 20, the voltage of current rectifying and wave filtering circuit 15, Current Control scope in specification;
Pwm control circuit 20: the pulse width of controlling filed effect transistor 21;
Field-effect transistor 21: control turning on and off of contravariant transformer.
As shown in Figure 5, charger circuit comprises the input port M1 that links to each other with alternating current, and input port M1 connects electromagnetism anti-jamming circuit 13, contravariant transformer 14, gauge tap 16 and lead-out terminal M2 successively; Described gauge tap 16 links to each other with charger chip 17; Charger chip 17 links to each other with status display circuit 18, feedback circuit 19 respectively; Feedback circuit 19 links to each other with field-effect transistor 21 through pwm control circuit 20, and contravariant transformer 14 also links to each other with field-effect transistor 21; Current rectifying and wave filtering circuit also links to each other with feedback circuit 19.
When the charger circuit of the utility model is lower than 2.5V at the voltage of any single battery, can carry out precharge to this batteries, promptly low current charge can prevent that like this lithium battery group is impaired, prolongs the service life of lithium battery group.Charging current during precharge is 200mA; Be 30 minutes precharge time, and after 30 minutes, whether the voltage that main control chip 5 detects all single batteries recovers normal; Promptly return to more than the 2.5V; When the voltage of all single batteries all is higher than 2.5V, again the lithium battery group is charged normal, the charging current that charges normal is 4A; If after 30 minutes, also have the voltage of single battery to be lower than 2.5V, charger should stop charging, and pilot cell damages.
Charger adopts state-of-the-art pwm chip and charger chip, realizes converting alternating voltage to the DC voltage of battery charge, and through feedback circuit 19, the voltage of control battery charge, electric current.But adopt charger chip and the charger chip of innovation and the communicating by letter of battery management chip of coding again, realize the Based Intelligent Control of charging process.
The advantage of communicating by letter of charger chip and battery management chip: the service life that prolongs rechargeable battery; The charger chip is communicated by letter with battery management chip, improves the safety of charging; Can in 1 hour, accomplish charging fast.
The above only is the preferred implementation of the utility model; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; Can also make some improvement and retouching, these improvement and retouching also should be regarded as the protection domain of the utility model.
Claims (8)
1. lithium electricity mower, it comprises the motor that drives cutting blade, and motor links to each other with the control system, and the control system links to each other with power supply; It is characterized in that: described motor is a direct current generator, and described power supply is the lithium battery group, and direct current generator links to each other with the lithium battery group through the control system; Described control system comprises:
Main control chip (5): be used for receiving and handle various data, and information is sent to interlock circuit;
Single battery tension measuring circuit (1): the single battery voltage that is used for measuring the lithium battery group; And constantly send each single battery magnitude of voltage to main control chip (5), main control chip (5) judges whether to occur overcharging, cross put or single battery between the excessive phenomenon of pressure reduction;
Temperature measuring circuit (6): be used to measure the temperature of lithium battery group, and temperature information is constantly fed back to main control chip (5), main control chip (5) judges that the lithium battery group is whether in the normal working temperature scope;
LED capacity display circuit (7): be used to show current lithium battery group residual capacity;
PWM adjusts circuit (8): be used to control a discharge switch pipe Q1 and No. two discharge switch pipe Q2, and control brake switch pipe Q3;
Discharge current testing circuit (9): be used to measure the discharge current of lithium battery group, and this current value is exported to main control chip (5);
Charging control switch (10): be used to control opening and turn-offing of charge circuit;
Discharge trigger switch (11): be used for detecting whether to open a discharge switch pipe Q1 and No. two discharge switch pipe Q2;
The input of single battery tension measuring circuit (1) is connected to the both positive and negative polarity of each battery of lithium battery group, and the output of single battery tension measuring circuit (1) links to each other with the input of main control chip (5); The input of temperature measuring circuit (6) links to each other with the both positive and negative polarity of lithium battery group, and the output of temperature measuring circuit (6) links to each other with the input of main control chip (5); Main control chip (5) also links to each other with LED capacity display circuit (7), PWM adjustment circuit (8), discharge current testing circuit (9), discharge trigger switch (11) respectively; The output of PWM adjustment circuit (8) is connected in parallel to discharge switch pipe Q1, No. two discharge switch pipe Q2 and brake switch pipe Q3, another termination discharge negative pole of discharge switch pipe Q1, No. two discharge switch pipe Q2 and brake switch pipe Q3; The input of discharge current testing circuit (9) is connected in the two ends of resistance R 1, resistance R 2 in parallel, and respectively as the both positive and negative polarity of current sampling; Another termination firing switch of discharge trigger switch (11); Main control chip (5), lithium battery group positive pole all link to each other with charging control switch (10); Charging is anodal, the discharge negative pole links to each other with charger circuit respectively.
2. a kind of lithium electricity mower according to claim 1; It is characterized in that: described control system also comprises the linear voltage decreasing circuit (3) that voltage stabilizing is used; And be used to control linear reduction voltage circuit (3), and then the power supply supply of control The whole control system power supply is from latching circuit (4); Described power supply supply is from latching circuit (4) at main control chip (5) when not working, and the power supply supply is closed from latching circuit (4), and then is cut to main control chip (5) power supply; When main control chip (5) was worked, opening power was whole control circuit system power supply from latching circuit (4);
The power supply supply links to each other with main control chip (5) from the input that latchs circuit (4); The power supply supply links to each other with the input of linear voltage decreasing circuit (3) from the output that latchs circuit (4), and the output of linear voltage decreasing circuit (3) is anodal with the lithium battery group respectively, main control chip (5) links to each other.
3. a kind of lithium electricity mower according to claim 1 and 2; It is characterized in that: described control system also comprises the charge balancing circuit (2) that is used for adjusting each single battery balance of voltage of lithium battery group, and the input of charge balancing circuit (2) is connected between the both positive and negative polarity of each single battery of lithium battery group; In charging process; If main control chip (5) detects the voltage of single battery in the lithium battery group when pressure reduction occurring; Charge balancing circuit (2) can be according to the result of main control chip (5) feedback, the battery discharge the highest to voltage, and then make the voltage of each battery of lithium battery group reach balance.
4. a kind of lithium electricity mower according to claim 3; It is characterized in that: the pressure reduction between the voltage of single battery is during more than or equal to 50mV; Charge balancing circuit (2) discharges to the highest single battery of voltage, and the pressure reduction between the minimum single battery of the highest single battery of voltage and voltage is less than 50mV.
5. a kind of lithium electricity mower according to claim 1, it is characterized in that: described single battery tension measuring circuit (1) has comprised the FET Q4 of electronics on-off action, carries out the computing amplification appliance U1A of voltage adjustment, difference amplification; One end of resistance R 3 links to each other with the positive pole of single battery, and the other end links to each other with 6 pin of FET Q4; 3 pin of FET Q4 link to each other with resistance R 4, and the other end of resistance R 4 is connected to the negative pole of single battery; 1 pin of FET Q4 links to each other with 3 pin of resistance R 5, computing amplification appliance U1A, and the other end of resistance R 5 is connected to power cathode; 4 pin of FET Q4 link to each other with 2 pin of resistance R 6, computing amplification appliance U1A, and the other end of resistance R 6 is connected to 1 pin of computing amplification appliance U1A; 1 pin of computing amplification appliance U1A links to each other with resistance R 7, resistance R 8 again, and the other end of resistance R 7 links to each other with capacitor C 1, and the other end of capacitor C 1 links to each other with the other end of resistance R 8 and is connected to the negative pole of power supply, the voltage of AN1 end output single battery.
6. a kind of lithium electricity mower according to claim 1; It is characterized in that: described PWM adjustment circuit (8) comprises adjustment chip U7; 2 pin, 3 pin of adjustment chip U7 link to each other with the output of main control chip 5 through resistance R 14; 1 pin of adjustment chip U7 connects positive pole, the capacitor C 3 of diode D5 respectively, the other end ground connection of capacitor C 3, and the negative pole of diode D5 connects the 8th pin and the capacitor C 4 of adjustment chip U7; The other end of capacitor C 4 is connected to resistance R 15 and lead-out terminal Moto-; 6 pin of another terminations adjustment chip of resistance R 15 U7,7 pin of adjustment chip U7 connect the positive pole of diode D6 and the base stage of transistor Q6, and the negative pole of diode D6 extremely links to each other with the G of the emitter stage of transistor Q6, resistance R 16, brake switch pipe Q3 respectively; The colelctor electrode of transistor Q6 links to each other with resistance R 16, the S utmost point of brake switch pipe Q3, lead-out terminal Moto-respectively, is used to control motor and suddenly stops braking; 5 pin of adjustment chip U7 are connected to the base stage of positive pole and the transistor Q5 of diode D7; The negative pole of diode D7 is connected with the emitter stage of transistor Q5, resistance R 17, the G utmost point of a discharge switch pipe Q1, the G utmost point of No. two discharge switch pipe Q2 respectively; The S utmost point of the S utmost point of the other end of the colelctor electrode of transistor Q5, resistance R 17, a discharge switch pipe Q1, No. two discharge switch pipe Q2 connects power cathode, is used to control the PWM adjustment function of a discharge switch pipe Q1 and No. two discharge switch pipe Q2; The D utmost point of the D utmost point of a discharge switch pipe Q1, No. two discharge switch pipe Q2 links to each other with lead-out terminal Moto-, and the D utmost point of brake switch pipe Q3 meets lead-out terminal Moto+; Lead-out terminal Moto+, Moto-are connected respectively to the both positive and negative polarity of motor, realize the function of PWM adjustment circuit.
7. a kind of lithium electricity mower according to claim 1, it is characterized in that: it also comprises charging temperature probe (12), and described charging temperature probe (12) one ends link to each other with main control chip (5), and the other end links to each other with charger circuit.
8. a kind of lithium electricity mower according to claim 1, it is characterized in that: the normal range of operation when described lithium battery group is charged is 0～45 ℃; Normal range of operation during discharge is-10～65 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220166052 CN202565762U (en) | 2012-04-18 | 2012-04-18 | Li-battery cropper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220166052 CN202565762U (en) | 2012-04-18 | 2012-04-18 | Li-battery cropper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202565762U true CN202565762U (en) | 2012-12-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220166052 Withdrawn - After Issue CN202565762U (en) | 2012-04-18 | 2012-04-18 | Li-battery cropper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202565762U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102630433A (en) * | 2012-04-18 | 2012-08-15 | 常州合力电器有限公司 | Lithium-cell lawn mower |
| CN111834677A (en) * | 2019-04-18 | 2020-10-27 | 东莞新能德科技有限公司 | Battery management method, battery management device, battery management system and terminal equipment |
-
2012
- 2012-04-18 CN CN 201220166052 patent/CN202565762U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102630433A (en) * | 2012-04-18 | 2012-08-15 | 常州合力电器有限公司 | Lithium-cell lawn mower |
| CN102630433B (en) * | 2012-04-18 | 2014-07-02 | 常州合力电器有限公司 | Lithium-cell lawn mower |
| CN111834677A (en) * | 2019-04-18 | 2020-10-27 | 东莞新能德科技有限公司 | Battery management method, battery management device, battery management system and terminal equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121205 Effective date of abandoning: 20140702 |
|
| RGAV | Abandon patent right to avoid regrant |