CN103078300B - Mine intrinsic safety lithium battery power supply system - Google Patents
Mine intrinsic safety lithium battery power supply system Download PDFInfo
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- CN103078300B CN103078300B CN201210587751.9A CN201210587751A CN103078300B CN 103078300 B CN103078300 B CN 103078300B CN 201210587751 A CN201210587751 A CN 201210587751A CN 103078300 B CN103078300 B CN 103078300B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 69
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- 239000007789 gas Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 3
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 206010025482 malaise Diseases 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
- 230000009329 sexual behaviour Effects 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
Cannot for providing the problem of stable power apart from longer equipment in order to solve power supply in prior art.The present invention proposes a kind of mine intrinsic safety lithium battery power supply system, comprising: lithium battery and protection module thereof, be made up of lithium battery and charge and discharge protecting module, for the protection of lithium battery overshoot electricity, the overdischarge of protection lithium battery, and when the temperature of lithium battery exceedes dangerous temperature, to lithium battery power-off; Boost module, for by the 12V voltage of the 3.7V voltage transitions of lithium battery needed for load, and outputs to second class protection line module; Second class protection line module, is made up of two identical parts, and every part comprises output over-voltage protection and exports overcurrent protection.The present invention adopts new safe secondary protection circuit; overcurrent protection resistance is placed on the negative pole end of power supply product; first the voltage that overcurrent protection resistance gathers is amplified; overcurrent protection resistance voltage after amplification and benchmark compare; because adopt less overcurrent protection resistance; overcurrent protection resistance is generally the resistance of milliohm level, so the voltage drop of resistance is just little on circuit, the wire like this from power end to equipment end just can use longer wire.
Description
Technical field
The present invention relates to a kind of electric power system, particularly a kind of mine intrinsic safety lithium battery power supply system for coal industry.
Background technology
Safe secondary protection circuit in the past; overcurrent protection resistance is the positive terminal at circuit; larger voltage drop can be produced after current flowing resistance; such as overcurrent protection resistance is 0.5 Europe; flow through the electric current of 1A; the pressure drop produced is 0.5V; need to flow through 2 such resistance through second class protection; so the pressure drop of entirety is 1V; the power supply of 12V has arrived output and has become 11V; add the voltage loss on wire, having arrived product use side is just about 10.6V, and power supply cannot provide stable electric power for the longer equipment of distance.
Underground coal mine contains multiple inflammable, explosive dangerous gas (as methane, CO etc.), need adopt probe monitors in real time, ensures downhole safety to take measures.Downhole monitoring substation carries the vital task to monitoring probe signal transacting, control circui, and the uninterrupted stand-by power supply of main employing realizes power supply in real time to downhole monitoring substation.Wherein battery pack is one of assembly of core the most in uninterrupted power supply (UPS) system, the number of the weight of battery and volume, discharge capacity, discharging current characteristic, high/low temperature flash-over characteristic and useful life, directly have influence on the weight of uninterrupted power supply (UPS), volume, discharge time and reliability.Underground coal mine, as the intrinsic safety place of high safety grade, requires output voltage, electric current realizes second class protection, so as not to cause external spark to cause coal mine downhole safety sexual behavior therefore.
At present, on market to can be used for the uninterrupted power supply that coal mine underground monitoring substation powers be all realized by " maintenance-free lead accumulator ", existing lead acid accumulator exists obviously not enough: 1. when the 3 above current discharge of multiplying power, less than 30% of battery capacity can only be released, and when charging, its charging current must control more than 0.25 multiplying power, after discharging completely, its charging interval needs just can be charged to 80% of battery capacity at 8 hours, and the shortcoming that cycle performance of battery is poor, charging time is short is given prominence to; 2. lead acid accumulator is in life cycle, and capacity declines year by year, and its dynamic change is difficult to the second class protection ensureing output voltage, electric current, seriously constrains the index of underground coal mine uninterrupted power supply; 3. the cycle life of lead acid storage battery tank discharge is at about 300 times, and discharge capacity is poorer at low ambient temperatures, and underground coal mine ambient temperature is close to 0 degree, and lead acid accumulator is unwell to underground coal mine application; 4. the primary raw material of lead acid accumulator is " lead ", and it uses and " lead " discharge directly has influence on groundwater environment; 5. there is liberation of hydrogen side reaction in lead acid accumulator in charging process, and hydrogen has a strong impact on coal mine downhole safety as high risk gas.
At present, most downhole monitoring substation uninterrupted power supply only can maintain downhole monitoring substation work 2 hours.Along with the continuous intensification of the pit mining degree of depth, the continuous lengthening in digging face, within 2 hours, down-hole practical application needs far can not be met.Because lead-acid battery group does not have internal discharge, charging controlling mechanism; its electric discharge output voltage and electric current are difficult to be in and keep stablizing; be difficult to the second class protection output realizing output current, voltage, thus significantly impact the many index such as reliability, fail safe, practicality of underground coal mine product.
Summary of the invention
Cannot for providing the problem of stable power apart from longer equipment in order to solve power supply in prior art, the present invention adopts new safe secondary protection circuit, overcurrent protection resistance is placed on the negative pole end of power supply product, first the voltage that overcurrent protection resistance gathers is amplified, if do not adopt circuit enlarging function, the ohmically magnitude of voltage of overcurrent protection is very low, cannot compare with reference voltage, and small voltage is easily subject to the interference of outside noise signal, cause protective circuit misoperation, overcurrent protection resistance voltage after amplification and benchmark compare, because adopt less overcurrent protection resistance, overcurrent protection resistance is generally the resistance of milliohm level, so the voltage drop of resistance is just little on circuit, wire like this from power end to equipment end just can use longer wire.
The present invention proposes a kind of mine intrinsic safety lithium battery power supply system, described mine intrinsic safety lithium battery power supply system comprises: lithium battery and protection module thereof, be made up of lithium battery and charge and discharge protecting module, for the protection of lithium battery overshoot electricity, the overdischarge of protection lithium battery, and when the temperature of lithium battery exceedes dangerous temperature, to lithium battery power-off; Boost module, for by the 12V voltage of the 3.7V voltage transitions of lithium battery needed for load, and outputs to second class protection line module; Second class protection line module, is made up of two identical parts, and every part comprises output over-voltage protection and exports overcurrent protection.
According to an aspect of the present invention; in lithium battery and protection module thereof, by the closedown of transistor switch with open, realize lithium battery when overcharge, overdischarge and temperature are too high; to lithium battery power-off, thus prevent the overshoot of lithium battery, cross put and exceed dangerous temperature.
According to an aspect of the present invention, booster circuit uses MAX1771 chip as main control chip, can be directly the chip of 12V voltage by low voltage transition, and chip drives 2 metal-oxide-semiconductors produce the voltage of 12V.
According to an aspect of the present invention; adopt new safe secondary protection circuit; overcurrent protection resistance is placed on the negative pole end of power supply product; first the voltage that overcurrent protection resistance gathers is amplified; overcurrent protection resistance voltage after amplification and reference voltage compare, thus make power end can use longer wire to the wire of equipment end.
Mine intrinsic safety lithium battery power supply system in the present invention can be used in the system of mine vehicle system and other specific area, has broad prospects.
Accompanying drawing explanation
Below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
Fig. 1 is the mine intrinsic safety lithium battery power supply system block diagram according to the embodiment of the present invention.
Fig. 2 is the boost module circuit diagram according to the embodiment of the present invention.
Fig. 3 is the second class protection line module circuit diagram according to the embodiment of the present invention.
Fig. 4 is lithium battery according to the embodiment of the present invention and protection module thereof.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
According to a preferred embodiment of the invention, the new safe secondary protection circuit of power acquisition, overcurrent protection resistance is placed on the negative pole end of power supply product, first the voltage that overcurrent protection resistance gathers is amplified, if do not adopt circuit enlarging function, the ohmically magnitude of voltage of overcurrent protection is very low, cannot compare with reference voltage, and small voltage is easily subject to the interference of outside noise signal, cause protective circuit misoperation, overcurrent protection resistance voltage after amplification and benchmark compare, because adopt less overcurrent protection resistance, overcurrent protection resistance is generally the resistance of milliohm level, so the voltage drop of resistance is just little on circuit, wire like this from power end to equipment end just can use longer wire.
According to a preferred embodiment of the present invention, mine intrinsic safety lithium battery power supply system is made up of three parts: lithium battery and protection module, boost module, second class protection line module.Concrete block diagram is see accompanying drawing 1.
Lithium battery and protection module thereof are made up of lithium battery and charge and discharge protecting module.
Boost module is used for the 12V voltage source of the 3.7V voltage transitions of lithium battery needed for load;
Second class protection line module is made up of two identical parts, and every part comprises output over-voltage protection and exports overcurrent protection.
This power supply is 12V voltage through booster circuit by 3.7V boost in voltage by the chargeable lithium cell of 1 joint 3.7V, then through the two poles of the earth baffle circuit, powering load.The J1 of Fig. 2 connects the 3.7V output voltage of lithium battery, the J1 of J2 connection layout 3, for it provides 12V supply voltage, and the J2 connection device load of Fig. 3.
Fig. 4 is the theory diagram of lithium battery and protection module thereof, realizes controlling to lithium battery by lithium battery and protection module thereof.Lithium battery positive and negative electrode is connected with circuit anode, negative pole respectively; Dsp chip or single-chip microcomputer can be adopted as the control unit of lithium battery and protection module thereof, with realize controlling the discharge and recharge of battery and the data of monitoring are contrasted, Real-time Feedback.Described lithium battery and protection module thereof comprise controller, transistor switch, equalizing circuit, balanced load and Temperature Detector; described controller realizes managing the balance of voltage of battery by equalizing circuit and balanced load; realize the temperature monitoring to battery pack by Temperature Detector, and according to the signal of monitoring, switch management is realized to transistor switch.Equalizing circuit obtains the current potential of battery, is uploaded to controller; Temperature Detector obtains the temperature signal of lithium battery, is uploaded to controller; Described controller can be taked with under type process: 1. to crossing the battery of high potential, open the sub-road of equalizing circuit, realizes being connected in series of the sub-road of equalizing circuit and internal load, to this battery discharge to reduce its current potential, realizes the potential balance to battery; 2. when there is external circuit current potential, opening transistor switch when lithium battery is full of, with isolated charging, closing transistor switch when lithium battery underfill, dynamically charging to maintain battery; 3. when there is not external circuit current potential, realizing closing to transistor switch, making lithium battery to outside circuit discharging, when arriving lithium battery group cut-off discharge potential, realizing opening, to protect integral battery door no longer deep discharge to transistor switch; 4., when battery temperature exceedes definite value, realize turning off process, to prevent the further rising of battery temperature to transistor switch.By above-mentioned four kinds of control strategies, realize battery balanced, the charging to lithium battery, electric discharge and temperature control treatment, promote the high-security applications of battery.
If the voltage of single lithium battery is 3.7V, its maximum charging voltage allows to 4.2V.Then can arrange the overcharged voltage of single battery at 3.8 ~ 4.2V, controller can realize power-off by transistor switch in 10ms, to prevent overcharging of battery pack.
If the temperature of single lithium battery allows to 120 degree; safe temperature is 60 degree, then set battery temperature to protect point as 60 degree, when Temperature Detector monitor single battery temperature reach 60 degree time; controller realizes power-off by transistor switch in 10ms, to prevent the temperature rise of battery.
Cross for preventing battery and put, arranged and bleed off pressure protection voltage, if the minimum permission voltage of single battery is 2.0V; then set the minimum permission voltage of battery as 2.0V; when single battery reaches 2.0V, controller realizes power-off by metal-oxide-semiconductor in 10ms, puts to prevent the mistake of battery pack.
Cell voltage is converted to 12V by boost module, transfers high voltage to by low-voltage.
Booster circuit uses MAX1771 chip as main control chip, this chip can not need to configure any Parameters of The Parts around, it can be directly the chip of 12V voltage by low voltage transition, chip drives 2 metal-oxide-semiconductors produce the voltage of 12V, because during chip drives MOS, because metal-oxide-semiconductor is on off state, the opening and have superposing of voltage and current in turn off process of metal-oxide-semiconductor, metal-oxide-semiconductor is caused to generate heat, so adopt the mode of 2 metal-oxide-semiconductor parallel connections to drive, the temperature capability of metal-oxide-semiconductor can be increased like this, thus can fin be omitted, reduce the vertical height of product.
Physical circuit figure is shown in Figure 2.The 3.7V voltage input J1 port of lithium battery, first one end of J1 port connects one end of fuse F1, the other end of F1 connects one end of thermistor RT, the other end of RT connects one end of inductance L 1, and one end of electric capacity C1, C2, C3, the other end of electric capacity C1, C2, C3 connects the other end of J1, and ground connection; The other end of L1 connects the positive pole of diode D1, and the negative pole of D1 connects one end of J2 port; The negative pole of D1 connects one end of electric capacity C6, C7, C8 and resistance R3 simultaneously, and the other end of C6, C7, C8 connects the other end of J2 port, and ground connection; The positive pole of the other end connecting luminous diode D2 of R3, the negative pole of D2 connects the other end of J2 port.The V+ pin of U1 connects one end of J2 port, connects one end of electric capacity C4, the other end ground connection of C4 simultaneously; The REF pin of U1 connects one end of electric capacity C5, the other end ground connection of C5; The SHDN pin of U1, FB pin, AGND pin ground connection; The GND pin ground connection of U1, simultaneously one end of contact resistance R1 and R2, the CS pin that the other end of resistance R1 with R2 is connected U1 with and the source S of metal-oxide-semiconductor Q1 and Q2; The EXT pin of U1 connects the grid G of metal-oxide-semiconductor Q1 and Q2, and the drain D of Q1 and Q2 is connected to the centre of inductance L 1 and diode D1; J2 port is connected to the J1 port of accompanying drawing 2.
The specific implementation process of product is as shown in Figure 2: lithium battery 3.7V voltage by the J1 terminal of Fig. 2 through fuse F1, thermistor RT, to resistance C1, C2, C3 charges, inductance L 1 is flow through after charging, chip power supply is given after D1, chip starts to start, metal-oxide-semiconductor is opened after startup, resistance R1, R2 detect metal-oxide-semiconductor open after electric current, feed back to chip internal to compare, thus increase output duty cycle, improve output voltage, output voltage is made to reach 12V, export 12V voltage through C6, C7, J2 terminal after C8 in figure exports, the 12V voltage exported outputs to the J1 port of second class protection line module.
Connect the output voltage of boost module see Fig. 3, J1 terminal, when the output current of second class protection circuit is less than protective current, the G pole of Q13 is owing to isolating by capacitance C13, and the G pole tension of Q13 is lower than S pole tension, and Q13 conducting, produces and export, when exporting overcurrent and when output current reaches 1.2A, voltage on R12 and R12A becomes 0.05V, U11C, U11B, voltage on R12 and R12A amplifies by U11D, voltage after amplification exports through U11B, the voltage exported and D11 diode forward conduction voltage drop 0.6V reference voltage compare, the positive terminal voltage of U12A is higher than negative terminal voltage, U12A produces a high level signal and makes Q11 conducting, peak voltage during C12 and R120 absorption Q11 transient switching, after Q11 conducting, R117 and R118 produces dividing potential drop, the G pole tension of Q12 is reduced, make metal-oxide-semiconductor Q12 conducting, the Q12 of conducting impels the G pole of Q13 identical with the current potential of S pole, Q13 closes, Q13 can produce a reverse spike voltage when closedown, C14, R122 is used for absorbing peak voltage.When input voltage is more than 12.6V, during the reference voltage of the dividing potential drop now on R111 and R112 more than D11 diode forward conducting voltage 0.6V, the negative terminal voltage of U12B is higher than positive terminal voltage, and the output of U12B produces a low-voltage, and low-voltage causes simultaneously, the positive pole of D12 produces a low-voltage, R117 and R118 can be made to produce dividing potential drop, the G pole tension of Q12 is reduced, makes metal-oxide-semiconductor Q12 conducting, the Q12 of conducting impels the G pole of Q13 identical with the current potential of S pole, and Q13 closes.When the both positive and negative polarity of circuit does spark short circuit, because there is the function of the suppression electric current instantaneous variation of inductance L 1, so spark is less during positive and negative contact, because inductive current can not suddenly change, forward electromotive force will be produced on inductance, C11 and R124 is used for absorbing the peak voltage of forward electromotive force, when after both positive and negative polarity contact, R12, voltage drop on R12A increases, the voltage drop produced is amplified through U11, voltage after amplification is more than 0.5V reference voltage, produce a high level signal and make Q11 conducting, peak voltage during C12 and R120 absorption Q11 transient switching, after Q11 conducting, R117 and R118 produces dividing potential drop, the G pole tension of Q12 is reduced, make metal-oxide-semiconductor Q12 conducting, the Q12 of conducting impels the G pole of Q13 identical with the current potential of S pole, Q13 closes, Q13 can produce a reverse spike voltage when closedown, C14, R122 is used for absorbing peak voltage.Identical principle acts on another stage circuit.This PART illustrates the operation principle when using 1A electric current to protect.
Second is second class protection, so the resistance of collection signal is being placed on the negative pole (or also referred to as ground wire) of power supply with the difference of second class protection in the past by this second class protection, the small voltage collected is amplified, amplify voltage and diode on cathode voltage compare, conducting and the shutoff of 1 N-MOS and 2 P-MOS is controlled by comparator, and increase an inductance, inductance increases RC circuit, the peak voltage be used on absorption inductor, increase a transient state in the D pole of PMOS and suppress diode, in order to absorb the peak voltage produced on MOS in output short-circuit process.
Safe secondary protection circuit as shown in Figure 3.2 pin of J1 port are connected in series resistance R122, electric capacity C14, the other end of inductance L 1, L1 connects VCC1; The anode of U11C is by resistance R11 ground connection, and 1 pin of J1 is connected in series resistance R12 and R12A, and the other end of R12A connects Vout1, and be connected to the anode of U11D by resistance R13, the negative terminal of U11C with U11D is connected by resistance R15 simultaneously; Connected by resistance R14 between the output of U11C and negative terminal; Connected by resistance R16 between the output of U11D and negative terminal; The output of U11C is connected to the negative terminal of U11B by resistance R17; The output of U11D is connected to the anode of U11B by resistance R18; Connected by resistance R19 between the output of U11B and negative terminal; The output of U11B is connected to the anode of U12A; The negative terminal of U12A is connected to the anode of U12B, is connected to the positive pole of resistance R113 and diode D11 simultaneously, the minus earth of D11, and the other end of R113 is connected to 2 pin of J1 port; The negative terminal of U12B is connected to the centre of R111 and R112, and the other end of R111 is connected to 2 pin of J1 port, the other end ground connection of R112; The output of U121 is connected to 2 pin of J1 port by R114; The output of U12A is connected to 2 pin of J1 port by R115; The output of U12A is connected to the grid G of metal-oxide-semiconductor Q11 by R116, the output of U12A connects the negative pole of diode D13 simultaneously, and the positive pole of D13 is connected to the grid of metal-oxide-semiconductor Q11; The output of U12B connects the negative pole of diode D12, and the positive pole of D12 is connected to the drain electrode of metal-oxide-semiconductor Q11; The source ground of Q11; Ground connection after the drain series connection electric capacity C12 and resistance R120 of Q11; 2 pin of J1 port are connected to after drain series contact resistance R118 and R117 of Q11; Node in the middle of R117 and R118 is connected to the grid of metal-oxide-semiconductor Q12 by resistance R119; The source electrode of Q12 is connected to 2 pin of J1 port, and drain electrode is connected to the grid of metal-oxide-semiconductor Q13, simultaneously by resistance R123 ground connection; The source electrode of Q13 is connected to 2 pin of J1 port, connects one end of electric capacity C13, one end of other end contact resistance R121 of C13 and the negative pole of Zener diode ZD11 simultaneously, and the other end of R power 1 connects the drain electrode of Q13, the plus earth of ZD11; The drain electrode of Q13 connects the node in the middle of C14 and L1, is connected in series resistance R124 and electric capacity C11 simultaneously, is then connected to VCC1; One end of VCC1 contact resistance R125 and the negative pole of diode D14, the other end of R125 and the positive pole of D14 are connected to Vout1.Another part and the foregoing circuit of safe secondary protection circuit are similar, are not repeating at this.
According to Fig. 3, when output current is less than protective current, the G pole of Q13 is owing to isolating by capacitance C13, and the G pole tension of Q13 is lower than S pole tension, and Q13 conducting, produces and export, the U11C when exporting overcurrent, U11B, voltage amplifies by U11D tri-part, voltage after amplification exports through U11B, the voltage exported and D11 diode forward conduction voltage drop 0.6V reference voltage compare, the positive terminal voltage of U12A is higher than negative terminal voltage, U12A produces a high level signal and makes Q11 conducting, peak voltage during C12 and R120 absorption Q11 transient switching, after Q11 conducting, R117 and R118 produces dividing potential drop, the G pole tension of Q12 is reduced, make metal-oxide-semiconductor Q12 conducting, the Q12 of conducting impels the G pole of Q13 identical with the current potential of S pole, Q13 closes, Q13 can produce a reverse spike voltage when closedown, C14, R122 is used for absorbing peak voltage.Overvoltage protection: when the reference voltage of the dividing potential drop of input voltage on R111 and R112 more than D11 diode forward conducting voltage 0.6V; the negative terminal voltage of U12B is higher than positive terminal voltage; the output of U12B produces a low-voltage; low-voltage causes the positive pole of D12 to produce a low-voltage simultaneously; R117 and R118 can be made to produce dividing potential drop, the G pole tension of Q12 is reduced, makes metal-oxide-semiconductor Q12 conducting; the Q12 of conducting impels the G pole of Q13 identical with the current potential of S pole, and Q13 closes.When the both positive and negative polarity of circuit does spark short circuit, because there is the function of the suppression electric current instantaneous variation of inductance L 1, so spark is less during positive and negative contact, because inductive current can not suddenly change, forward electromotive force will be produced on inductance, C11 and R124 is used for absorbing the peak voltage of forward electromotive force, when after both positive and negative polarity contact, R12, voltage drop on R12A increases, the voltage drop produced is through U11C, U11B, U11D amplifies, voltage after amplification exports through U11B, the voltage exported and D11 diode forward conduction voltage drop 0.6V reference voltage compare, the positive terminal voltage of U12A is higher than negative terminal voltage, U12A produces a high level signal and makes Q11 conducting, peak voltage during C12 and R120 absorption Q11 transient switching, after Q11 conducting, R117 and R118 produces dividing potential drop, the G pole tension of Q12 is reduced, make metal-oxide-semiconductor Q12 conducting, the Q12 of conducting impels the G pole of Q13 identical with the current potential of S pole, Q13 closes, Q13 can produce a reverse spike voltage when closedown, C14, R122 is used for absorbing peak voltage.Identical principle acts on another stage circuit.These 2 grades of circuit are identical, because be 2 grades of circuit, the ground of the first order and the ground of the second level separate, and Vout1 is a label, and all Vout1 connect together.
After being depicted as actual circuit board, successfully transferred to the direct voltage of 12V by lithium battery 3.7V voltage, output current 0.6A by this circuit diagram; Second class protection plate can start work, and work protective current is 1A, and overvoltage protection is 12.5V, and product, through the spark experiment of tens thousand of times, does not occur bad phenomenon.
Because the particularity of coal production, product under requirement colliery is when being short-circuited or when the contact point on circuit comes off, passable when not cutting off externally fed, directly product-laden can be connected to the output of power supply, and requirement can not produce spark, or the spark produced can not ignite the gas of surrounding; And colliery requires that the protection inside product is second class protection, when after first order shielding failure, second level protection can continue to work, and this second class protection can be applied to colliery etc. and contain in the environment of methane gas.
Although describe embodiment of the present invention and various functional unit thereof in a particular embodiment, but be to be understood that, can realize embodiment of the present invention with hardware, software, firmware, middleware or their combination, and embodiment of the present invention can be used in multiple systems, subsystem, assembly or its sub-component.Each embodiment of the present invention can combine mutually with the device in other embodiment, instead of isolated, single embodiment, can mutually merge and form new embodiment or different solutions between all embodiments.
Although the present invention detailed illustrate and describe one relevant and specifically implement exemplary reference, those skilled in the art should be understood that, not deviating from the spirit and scope of the present invention and can make various change in the form and details.These changes all will fall into claim of the present invention scope required for protection.
Claims (4)
1. a mine intrinsic safety lithium battery power supply system, is characterized in that, described mine intrinsic safety lithium battery power supply system comprises:
Lithium battery and protection module thereof, be made up of lithium battery and charge and discharge protecting module, for the protection of over-charge of lithium battery electricity, and the overdischarge of protection lithium battery, and when the temperature of lithium battery exceedes dangerous temperature, to lithium battery power-off; Described lithium battery and protection module thereof comprise controller, transistor switch, equalizing circuit, balanced load and Temperature Detector, described controller realizes managing the balance of voltage of battery by equalizing circuit and balanced load, realize the temperature monitoring to battery pack by Temperature Detector, and according to the signal of monitoring, switch management is realized to transistor switch;
Boost module, for by the 12V voltage of the 3.7V voltage transitions of lithium battery needed for load, and outputs to second class protection line module;
Boost module circuit is as follows: the 3.7V voltage input J1 port of lithium battery, first one end of J1 port connects one end of fuse F1, the other end of F1 connects one end of thermistor RT, the other end of RT connects one end of inductance L 1, and one end of electric capacity C1, C2, C3, the other end of electric capacity C1, C2, C3 connects the other end of J1, and ground connection; The other end of L1 connects the positive pole of diode D1, and the negative pole of D1 connects one end of J2 port; The negative pole of D1 connects one end of electric capacity C6, C7, C8 and resistance R3 simultaneously, and the other end of C6, C7, C8 connects the other end of J2 port, and ground connection; The positive pole of the other end connecting luminous diode D2 of R3, the negative pole of D2 connects the other end of J2 port; The V+ pin of U1 connects one end of J2 port, connects one end of electric capacity C4, the other end ground connection of C4 simultaneously; The REF pin of U1 connects one end of electric capacity C5, the other end ground connection of C5; The SHDN pin of U1, FB pin, AGND pin ground connection; The GND pin ground connection of U1, simultaneously one end of contact resistance R1 and R2, the CS pin that the other end of resistance R1 with R2 is connected U1 with and the source S of metal-oxide-semiconductor Q1 and Q2; The EXT pin of U1 connects the grid G of metal-oxide-semiconductor Q1 and Q2, and the drain D of Q1 and Q2 is connected to the centre of inductance L 1 and diode D1;
Wherein, described U1 adopts MAX1771 chip;
Second class protection line module, is made up of two identical parts, and every part comprises output over-voltage protection and exports overcurrent protection.
2., as the mine intrinsic safety lithium battery power supply system in claim 1, it is characterized in that:
In lithium battery and protection module thereof, by the closedown of transistor switch with open, realize lithium battery when overcharge, overdischarge and temperature are too high, to lithium battery power-off, thus prevent the overcharging of lithium battery, cross and put and exceed dangerous temperature.
3., as the mine intrinsic safety lithium battery power supply system in claim 1, it is characterized in that:
Boost module uses MAX1771 chip as main control chip, is directly 12V voltage by low voltage transition, drives the voltage of 2 metal-oxide-semiconductors generation 12V.
4., as the mine intrinsic safety lithium battery power supply system in claim 1, it is characterized in that:
The second class protection line module adopted; overcurrent protection resistance is placed on the negative pole end of power supply product; first the voltage that overcurrent protection resistance gathers is amplified; overcurrent protection resistance voltage after amplification and reference voltage compare, thus the wire making power end arrive equipment end uses long wire.
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| CN104617547B (en) * | 2015-02-15 | 2017-12-05 | 山东微感光电子有限公司 | A kind of mine intrinsic safety electric source dual-protection circuit |
| CN105342584A (en) * | 2015-10-14 | 2016-02-24 | 天津华宁电子有限公司 | Mining monitoring system |
| CN109565171B (en) | 2016-08-29 | 2020-08-07 | 华为技术有限公司 | Charging protection method, terminal and charger |
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