CN106714384A - Light-emitting diode (LED) drive circuit and LED drive method for automobile starting power supply - Google Patents
Light-emitting diode (LED) drive circuit and LED drive method for automobile starting power supply Download PDFInfo
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- CN106714384A CN106714384A CN201710048496.3A CN201710048496A CN106714384A CN 106714384 A CN106714384 A CN 106714384A CN 201710048496 A CN201710048496 A CN 201710048496A CN 106714384 A CN106714384 A CN 106714384A
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- led
- power supply
- circuit
- drive circuit
- automobile starting
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Abstract
The invention discloses a light-emitting diode (LED) drive circuit and an LED drive method for an automobile starting power supply. The LED drive circuit comprises a lighting type LED lamp (D15), a red LED indicating lamp, a green LED indicating lamp and a switching device (Q5), wherein a positive pole of the lighting type LED lamp is connected with a positive pole of a direct current (DC) power supply by a first current-limiting resistor; a negative pole of the lighting type LED lamp is in ground connection by means of the switching device; a control end of the switching device is connected with an LED control port (CTL-LED) by a resistor R11; positive poles of the red LED indicating lamp and the green LED indicating lamp are connected with the positive pole of the DC power supply by a second current-limiting resistor (R53) after being in short-circuit connection; negative poles of the red LED indicating lamp and the green LED indicating lamp are respectively connected with a red LED lamp control port (LED-R) and a green LED lamp control port (LED-G). The LED drive circuit for the automobile starting power supply is simple in circuit, fewer in needed elements and easy to control.
Description
Technical field
The present invention be more particularly directed to a kind of LED drive circuit and method for automobile starting power supply.
Background technology
LED is widely used, such as in portable power source, it is necessary to using LED as indicate and illuminate, it is existing for vapour
The LED drive circuit device of car startup power supply is more, and control is complicated, therefore, it is necessary to design a kind of for automobile starting power supply
LED drive circuit and method.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of LED drive circuit for automobile starting power supply and side
Method, this is used for the LED drive circuit simple circuit of automobile starting power supply, and element used is few, it is easy to control.
The technical solution of invention is as follows：
A kind of LED drive circuit for automobile starting power supply, including illumination type LED (D15), red LED indicator lamp,
Green LED indicator lamp and switching device (Q5)；
The positive pole of illumination type LED connects DC power anode (5V-VDD) through the first current-limiting resistance；Illumination type LED it is negative
Pole is grounded through switching device；The control end of switching device connects LED control ports (CTL-LED) through resistance R11；
After the positive pole short circuit of red LED indicator lamp and green LED indicator lamp dc source is connect through the second current-limiting resistance (R53)
Positive pole (5V-VDD)；
The negative pole of red LED indicator lamp and green LED indicator lamp connects red LED lamp control port (LED-R) and green respectively
Color LED control port (LED-G).
Described switching device is managed for N-MOS；The D poles of N-MOS pipes connect the negative pole of illumination type LED；The S poles of N-MOS pipes
Ground connection (SGND)；The G poles connecting resistances R11 of N-MOS pipes.
The model 2N7002K of N-MOS pipes.
Described switching device is the triode of NPN type；The C poles of triode connect the negative pole of illumination type LED；Triode
E poles are grounded (SGND)；The B poles connecting resistances R11 of triode.
Red LED indicator lamp and green LED indicator lamp use dual-colored LED lamp (D4)；First current-limiting resistance is 50 ohm of (figures
In for R48 and R20 it is in parallel), the second current-limiting resistance (R53) is 2.4K ohm, and resistance R11 is 1K ohm；DC power anode is
3.3V。
LED control ports for MCU I/O port or key circuit output end, red LED lamp control port (LED-R) and
Green LED lamp control port (LED-G) is the I/O port of MCU.
The dimensions of D15 is 5mm, power 0.5W；It is direct insertion device.
Dual input power supply circuit is used to be powered for the LED drive circuit for automobile starting power supply；Dual input power supply circuit
With the first power input and second source input, the first power input is used to connect with the positive pole of automobile batteries；The
Two power inputs are used to connect the positive pole of dry cell batteries；Red LED lamp control port (LED-R) and green LED lamp control port
(LED-G) it is the I/O interface of controller, controller is using SC8F2712 cake cores.
A kind of LED driving methods for automobile starting power supply, are driven using the LED for being previously described for automobile starting power supply
Circuit；Using SC8F2712 cake cores as controller；By red LED lamp control port (LED-R) and green LED lamp control end
Mouth (LED-G) and LED control ports (CTL-LED) control the state of LED；
Control method is as follows：
(1) during red LED lamp control port (LED-R) output low level, when red；
(2) during green LED lamp control port (LED-G) output low level, green light；
(3) during LED control ports (CTL-LED) high level, Q5 conductings, D15 conductings are luminous.
There is relay drive circuit, relay drive circuit includes relay and the first drive module in output circuit；
The first described drive module includes the first control signal input circuit and 2 N-MOS pipes Q9 and Q13；
First control signal input circuit includes the resistance R52 and R19 of series connection；First termination control signal of resistance R52
CTL-START；Second end of resistance R52 is grounded through resistance R19；The G of 2 N-MOS pipes Q9 and Q13 is extremely shorted to resistance R52
With the tie point of R19；The S of 2 N-MOS pipes Q9 and Q13 is extremely grounded；2 D poles of N-MOS pipes Q9 and Q13 and accumulation power supply
The first coil of relay is connected between positive pole BAT+.
The described automobile starting power supply based on super capacitor also includes detection circuit, and detection circuit includes temperature detection branch
Road, supply voltage detection branch and A/D converter；Described A/D converter is multi-channel a/d converter；A/D converter it is defeated
Go out end output testing result data；
In temperature detection branch road, thermistor RT1 is connected with supply voltage (5V-VDD), thermistor RT1 and resistance R22
Series connection, resistance R22 ground connection；The first analog signal that the tie point (V07) of thermistor RT1 and resistance R22 connects A/D converter is defeated
Inbound port (AN1)；
In supply voltage detection branch, resistance R66 and R67 ground connection of the supply voltage Vbout+ through being sequentially connected in series；Resistance R66
With the second input end of analog signal mouthful (AN2) that the tie point (V06) of R67 connects A/D converter.
Detection circuit includes switch detection branch；In switch detection branch, supply voltage (5V-VDD) is through what is be sequentially connected in series
Resistance R89, switch SW1 and resistance R21 ground connection；The tie point (CLK) of resistance R89 and switch SW1 connects the clock letter of A/D converter
Number end (CLK/P2.1)；
Governor circuit uses SC8F2712 cake cores；Booster circuit uses FP5139 chips.
Booster circuit uses FP5139 type integrated chips.
Dry battery charge interface is connected with dry battery cabin, and the dry cell of 3~5 section 1.5V can be accommodated in dry battery cabin.
Automobile starting power supply based on super capacitor also includes the counter voltage protection circuit being connected with governor circuit.
3 control ends：The control output end of CTL-CHG, CTL-INA and CTL-INB from MCU, specifically, circuit work
Make principle as follows：
CTL-INA：During high level, by Q3, CTL-A obtains low level, causes Q14 to turn on, and external voltage is directly through people
Electronics charges to energy-storage module；This is the first stage charged；
CTL-INB：During high level, low level is obtained by CTL-B after Q7, so that Q8 is turned on, external voltage connects U9；
CTL-CHG：During high level, through Q12 after, obtain low level in EN-19V, the CTL terminal potentials of U9d are pulled low, and U9 enters
Enter normal mode of operation, export constant pressure and charged to energy-storage module.
During CTL-CHG high level, it is desirable to which CTL-INA is in low level, using alternation pattern.
Beneficial effect：
LED drive circuit for automobile starting power supply of the invention, LED illumination is controlled using switching device (metal-oxide-semiconductor)
The opening and closing of lamp, consume energy small, and using the dual-colored LED lamp of compact as red green indicator lamp, compact conformation takes up room
It is small, in addition, power supply circuit can provide the 3.3V DC voltages of stabilization, LED steady operation is can guarantee that, light uniform, it is to avoid light
Light and shade change and flash.Therefore, this LED drive circuit and method simple circuit for automobile starting power supply, unit used
Part is few, it is easy to control.
In addition, this automobile starting power supply has the characteristics that：
(1) using a super capacitor or the super capacitor of multiple series connection as energy-storage module；
Using the accumulator of the portable power source based on super capacitor, it is totally different from using the energy storage mould of lithium ion battery
Block, risk without blast safe using super capacitor, and long service life；Portable power source based on super capacitor
Accumulator has the characteristics that：
A () charging rate is fast, charging can reach more than the 95% of its rated capacity in 10 seconds~10 minutes；
B () service life cycle is long, depth charge and discharge cycles access times do not have " memory effect " up to 1~500,000 times；
C () large current discharging capability is superpower, energy conversion efficiency is high, and process losses are small, and high current energy circulation efficiency >=
90%；
D () power density is high, up to 300W/KG~5000W/KG, equivalent to 5~10 times of battery；
(e) product raw material constitute, production, using, store and disassemble process and do not pollute, be preferably green ring
Protect power supply；
F () charge and discharge electric line is simple, without charging circuit as rechargeable battery, safety coefficient is high, and long-term use exempts from dimension
Shield；
G () ultralow temperature characteristics are good, and temperature range is wide -40 DEG C~and+70 DEG C；
H () is easy to detect, dump energy can directly read；
Sum it up, the outstanding advantages of the accumulator of this portable power source are that power density is high, the discharge and recharge time is short, follow
Ring long lifespan, operating temperature range are wide, and safe.
(2) interface of plurality of optional is used to be charged for energy-storage module；
Charging input interface is configured with automobile storage battery power taking interface, USB charging inlets, dry battery charge interface and automobile point
Cigarette device interface；Flexibility is strong, practical.
(3) whole charging process is controlled as governor circuit chip using the MCU with A/D converter, structure is tight
Gather, can significantly simplify circuit design；
(4) with bi-colour LED and illuminating lamp；
(5) charging process is controlled by preliminary filling electric control switch circuit and main charging control switch circuit；
(6) with overvoltage protection, temperature protection and electric voltage reverse-connection defencive function.
In addition, being implemented in combination with charge control with boosting protection chip using external control end, can realize that the complete of charging can
Control, security reliability is high；
For the dual input power supply circuit of portable power source, using 2 power inputs, one connects automobile batteries and (such as passes through
Cigar lighter socket connects battery), one connect dry cell batteries, be particularly suitable for it is vehicle-mounted use, wireless communication electricity can be portable power source
Energy-storage module charges.
In addition, using BAT54CW type Schottky-barrier diodes, forward voltage drop is low (because schottky barrier height is less than
PN junction barrier height, therefore its forward conduction threshold voltage and forward voltage drop are all lower than PN junction diode (about low 0.2V)), due to
SBD (Schottky-barrier diode) is a kind of majority carrier conductive devices, in the absence of minority carrier lifetime and Reverse recovery
Problem.The reverse recovery time of SBD is the charge and discharge time of Schottky barrier electric capacity, is totally different from PN junction diode
Reverse recovery time.Because the QRR of SBD is considerably less, therefore switching speed is very fast, and switching loss is also especially small, especially
It is suitable for frequency applications.The structure and feature of SBD make it suitable for being used as high-frequency rectification in low pressure, High-current output occasion.
Further, the ME6119A33PG types voltage-stablizer that voltage-stablizer is used is the adjustable master-hand's LDO voltage stabilizer of input voltage
(400mA Adjustable Voltage High Speed LDO Regulators), output voltage is accurate, input voltage model
It is 2.5~18V to enclose；Apply and be particularly suitable for herein, not only can be by booster circuit for energy-storage module charges, moreover it is possible to used as base
Quasi- voltage is used in temperature sensing circuit.
Therefore, the input voltage of this compatible wide scope of dual input power supply circuit energy for portable power source, using wide
It is general, and be chargeable, circuit working stability without alternating current, it is practical.
LED drive circuit, the opening and closing of LED illumination lamp are controlled using switching device (metal-oxide-semiconductor), are consumed energy small, are used
The dual-colored LED lamp of compact occupies little space as red green indicator lamp, compact conformation, in addition, power supply circuit can provide stabilization
3.3V DC voltages, can guarantee that LED steady operation, light uniform, it is to avoid the light and shade change and flicker of light.Therefore, this LED
Drive circuit simple circuit, element used is few, it is easy to control.
Relay drive circuit, relay is driven using 2 parallel drive modules, and reliability is high, safe, separately
Outward, and each drive module also has 2 N-MOS pipe, i.e., using Redundancy Design, time lag is small during switching, even if a derailing switch
Part is damaged, still can be with normal work, thus reliability is high, can ensure the regular picture of automobile starting power supply.
The detection circuit of startup power supply, is detected using the A/D converter of multiple input path to plurality of voltages signal, also
Monitoring temperature can be realized subsequently to realize overtemperature protection, integrated level is high in addition, simple circuit, it is easy to implement, and accuracy of detection is high,
Technical guarantee can be provided for the trouble free service of automobile starting power supply.
In sum, this startup power supply perfect in shape and function, integrated level is high, safe, is adapted to promotion and implementation.
Brief description of the drawings
Fig. 1 is the electric theory diagram of the automobile starting power supply based on super capacitor；
Fig. 2 is the schematic diagram of the booster circuit part of the automobile starting power supply based on super capacitor；
Fig. 3 is the circuit theory diagrams of USB part；
Fig. 4 is the schematic diagram of control end CTL-CHG, CTL-INA and CTL-INB parts.
Fig. 5 is the circuit theory diagrams of the dual input power supply circuit for portable power source；
Fig. 6 is the schematic diagram of the accumulator of portable power source；
Fig. 7 is the schematic diagram of LED drive circuit.
Fig. 8 is the circuit theory diagrams of the relay drive circuit for portable power source；
Fig. 9 is the schematic diagram of detection branch；
Figure 10 is the schematic diagram of A/D converter.
Specific embodiment
For the ease of understanding the present invention, do more complete to inventing herein below in conjunction with Figure of description and preferred embodiment
Face, meticulously describe, but protection scope of the present invention is not limited to specific embodiment.
Unless otherwise defined, all technical terms used hereinafter are generally understood that implication phase with those skilled in the art
Together.Technical term used herein is intended merely to describe the purpose of specific embodiment, is not intended to limitation of the invention
Protection domain.
Embodiment 1：
Such as Fig. 1, a kind of automobile starting power supply based on super capacitor, including governor circuit, charging input interface, voltage stabilizing electricity
Road, booster circuit, energy-storage module and output circuit；
Charging input interface is through mu balanced circuit for governor circuit is powered；
The boosted circuit of charging input interface charges for energy-storage module；Booster circuit is controlled by governor circuit；
Output circuit includes output interface and is controlled by the relay of governor circuit；Energy-storage module is by relay and output
Interface is connected；
Described energy-storage module is the energy-storage module based on super capacitor.
The described automobile starting power supply based on super capacitor also includes preliminary filling electric control switch circuit and main charge control
On-off circuit；The precharged controlling switch circuit of charging input interface connects energy-storage module；Charging input interface is through main charge control
On-off circuit connects booster circuit.
The described automobile starting power supply based on super capacitor also includes the indicator light circuit and photograph that are connected with governor circuit
Bright lamp circuit.
The described automobile starting power supply based on super capacitor also includes the overvoltage crowbar, the mistake that are connected with governor circuit
At least one in stream protection circuit and thermal-shutdown circuit.
Charging input interface is automobile storage battery power taking interface, USB charging inlets, dry battery charge interface and automobile cigarette lighter
At least one in interface.
Described governor circuit is using the MCU with A/D converter.
Described energy-storage module includes the super capacitor of multiple series connection, and the number of super capacitor is 2-10.
Booster circuit uses FP5139 type integrated chips.
Dry battery charge interface is connected with dry battery cabin, and the dry cell of 3~5 section 1.5V can be accommodated in dry battery cabin.
Automobile starting power supply based on super capacitor also includes the counter voltage protection circuit being connected with governor circuit.
Such as Fig. 1~3, a kind of charging control circuit of the automobile starting power supply based on super capacitor, including boosting protection core
Piece U9, charging output circuit and 3 control ends：CTL-CHG, CTL-INA and CTL-INB；Boosting protection chip U9 is FP5139
Chip；
(1) tie point of resistance R34s and R33 ground connection of the control end CTL-CHG through being sequentially connected in series, resistance R34 and R33 connects
The G poles of NMOS tube Q12；The S poles ground connection of Q12, the D extremely EN-19V ends of Q12；
(2) resistance R91 and R90 ground connection of the control end CTL-INB through being sequentially connected in series, the tie point of resistance R91 and R90 connects
The G poles of NMOS tube Q7；The S poles ground connection of Q7, the D extremely CTL-B ends of Q7；
(3) resistance R14 and R13 ground connection of the control end CTL-INA through being sequentially connected in series, the tie point of resistance R14 and R13 connects
The G poles of NMOS tube Q3；The S poles ground connection of Q3, the D extremely CTL-A ends of Q7；
(4) dc source VBOUT+ connects the S poles of PMOS Q14, and the D poles of Q14 are connecing energy-storage module just through thermistor RT4
Input BAT+；The G poles that bridging has resistance R29, Q14 between the G poles and S poles of Q14 connect CTL-A ends；
(5) dc source VBOUT+ connects the S poles of PMOS Q8, the inductance L4 and diode D6 of the D poles of Q8 through being sequentially connected in series
Meet the positive input terminal BAT+ of energy-storage module；The D poles of Q8 meet the feeder ear VCC of boosting protection chip U9；
The G poles that bridging has resistance R30, Q8 between the G poles and S poles of Q8 connect CTL-B ends；
(6) EN-19V ends meet the control end CTL of boosting protection chip U9 through resistance R57；
(7) charging output circuit：
The GATE ends of boosting protection chip U9 meet B poles and the PNP type triode Q20 of NPN type triode Q19 through resistance R15
B poles；E poles of the Q19 and C of Q20 is extremely short connects；The C poles of Q19 meet power supply VCC-BAT through resistance R16；
The E poles of Q19 connect the G poles of NMOS tube Q10 through resistance R43, and the D poles of Q10 connect the tie point of inductance L4 and diode D6；
The S poles of Q10 and the E of Q20 are extremely grounded.
The positive input terminal USB_IN of USB interface connects the S poles of Q8 through diode D17.
The anode BAT1+ of energy-storage module connects the S poles of Q8 through diode D16.
A kind of current foldback circuit for automobile starting power supply, including amplifying circuit, measurement resistance and boosting protection core
Piece U9；
Measurement resistance includes resistance R18 and Rx；Rx is in parallel by R31 and R32, Rx=0.005 ohm；
Measurement resistance R18 is serially connected in the front-end power loop of automobile starting power supply；
Measurement resistance Rx is serially connected in the energy-storage module discharge loop of automobile starting power supply；
Amplifying circuit is 2, i.e. the first amplifying circuit and the second amplifying circuit, is respectively used on 2 measurement resistance of measurement
Pressure drop；Amplifying circuit connects with the feedback end FB of boosting protection chip U9.
Described front-end power loop is USB current supply circuits；The first end ground connection of measurement resistance R18；Measurement resistance R18's
The negative terminal BAT1- of the second termination USB charging inlets J4.
Resistance Rx is connected between the negative output terminal SGND+ of energy-storage module discharge loop and ground SGND.
There is operational amplifier U1-B in first amplifying circuit；The first end of measurement resistance R18 connects computing and puts through resistance R39
The in-phase input end of big device U1-B；Second end of measurement resistance R18 connects the anti-phase input of operational amplifier U1-B through resistance R36
End；
Bridging has resistance R40 between the output end and inverting input of operational amplifier U1-B；
The output end of operational amplifier U1-B connects with the feedback end FB of boosting protection chip U9.
There is operational amplifier U1-A in second amplifying circuit；The first end of measurement resistance Rx connects computing and puts through resistance R45
The in-phase input end of big device U1-A；Second end of measurement resistance Rx connects the inverting input of operational amplifier U1-A through resistance R47；
Bridging has resistance R8 between the output end and inverting input of operational amplifier U1-A；
The output end of operational amplifier U1-A connects with the feedback end FB of boosting protection chip U9.
The output end of the first amplifying circuit is connected by diode D20 with the feedback end FB of boosting protection chip U9；And it is anti-
Feedback end FB connects the negative pole of diode D20；
The output end of the second amplifying circuit is connected by diode D9 with the feedback end FB of boosting protection chip U9；And feedback
End FB connects the negative pole of diode D9.
The model LM258ADR of operational amplifier U1-A and U1-B.
Diode D20 and D9 are BAT54HT1 type diodes.
Resistance Rx is 0.005 ohm.Rx is obtained by resistance R31 and R32 parallel connection.The resistance of resistance R18, R39, R36 and R40
Respectively 0.01 ohm, 1K ohm, 1K ohm and 20K ohm.
The circuit of the operational amplifier that current foldback circuit is used is see-saw circuit, and multiplication factor is about 20 times；Increase
Plus diode D20 plays a part of to prevent electric current from pouring in down a chimney, that is, ensure one-way conduction；Boosting protection chip has short circuit in itself in addition
Defencive function, and step-up discharge function, and the size of output current and voltage can be adjusted, it is feature-rich, amplifying circuit and
Protection IC is combined, and can realize the overcurrent protection of circuit, and reliability is high.
Fig. 5, a kind of dual input power supply circuit for portable power source, including the first power input (VBOUT+), second
Power input (VCC-BAT), diode, voltage-stablizer and power output end (5V-VDD)；
First power input is used to connect with the positive pole of automobile batteries；
Second source input is used to connect the positive pole of dry cell batteries；Dry cell batteries include three section dry cells, often save 1.5V, defeated
It is 4.5V to go out；
First power input connects the input of voltage-stablizer through diode；Second source input connects voltage-stablizer through diode
Input；
The output end of voltage-stablizer is power output end；The output end of voltage-stablizer exports the DC voltage of 3.3~5V.
Described diode is BAT54CW type Schottky-barrier diodes.
Described voltage-stablizer is ME6119A33PG type voltage-stablizers.
The input of voltage-stablizer is provided with electrochemical capacitor (C40)；The input and output of voltage-stablizer are also respectively connected to one
Non-electrolytic capacitor (C37 and C51)；The capacitance of described electrochemical capacitor is 47uF, and the capacitance of described non-electrolytic capacitor is
0.1uF。
Such as Fig. 6, the energy-storage module of portable power source includes 5 super capacitors (C1, C2, C3, C4 and C7) of series connection；Each surpasses
The capacitance of level electric capacity is 350F；It is totally different from using the energy-storage module of lithium ion battery, it is safe using super capacitor,
Risk without blast, and long service life；The effect of 4 sockets (J45, J11, J11, J18) in circuit is that overstriking is led
Electrical circuit；Because typical case's application of the power supply is to provide automobile starting electric current, electric current is big, and overstriking galvanic circle can effectively be protected
Device and circuit board.Each super capacitor is parallel with a voltage stabilizing branch road, and voltage stabilizing branch routing resistance and voltage-stabiliser tube are in series,
The resistance of resistance is 1 ohm, the model MMSZS223BT1 of voltage-stabiliser tube.
Such as Fig. 7, LED drive circuit is including illumination type LED (D15), red LED indicator lamp, green LED indicator lamp and opens
Close device (Q5)；
The positive pole of illumination type LED connects DC power anode (5V-VDD) through the first current-limiting resistance；Illumination type LED it is negative
Pole is grounded through switching device；The control end of switching device connects LED control ports (CTL-LED) through resistance R11；
After the positive pole short circuit of red LED indicator lamp and green LED indicator lamp dc source is connect through the second current-limiting resistance (R53)
Positive pole (5V-VDD)；
The negative pole of red LED indicator lamp and green LED indicator lamp connects red LED lamp control port (LED-R) and green respectively
Color LED control port (LED-G).
Described switching device is managed for N-MOS；The D poles of N-MOS pipes connect the negative pole of illumination type LED；The S poles of N-MOS pipes
Ground connection (SGND)；The G poles connecting resistances R11 of N-MOS pipes.
The model 2N7002K of N-MOS pipes.
Red LED indicator lamp and green LED indicator lamp use dual-colored LED lamp (D4)；First current-limiting resistance is 50 ohm of (figures
In for R48 and R20 it is in parallel), the second current-limiting resistance (R53) is 2.4K ohm, and resistance R11 is 1K ohm；DC power anode is
3.3V。
LED control ports for MCU I/O port or key circuit output end, red LED lamp control port (LED-R) and
Green LED lamp control port (LED-G) is the I/O port of MCU.
Operation principle explanation：
(1) when CTL-LED is high level, Q5 conductings, D15 conductings are luminous；
(2) when LED-G is low level, green LED lamp conducting is luminous；
(3) when LED-R is low level, red LED lamp conducting is luminous.
Such as Fig. 8, for the relay drive circuit of portable power source, including relay and the first drive module；
The first described drive module includes the first control signal input circuit and 2 N-MOS pipes Q9 and Q13；
First control signal input circuit includes the resistance R52 and R19 of series connection；First termination control signal of resistance R52
CTL-START；Second end of resistance R52 is grounded through resistance R19；The G of 2 N-MOS pipes Q9 and Q13 is extremely shorted to resistance R52
With the tie point of R19；The S of 2 N-MOS pipes Q9 and Q13 is extremely grounded；2 D poles of N-MOS pipes Q9 and Q13 and accumulation power supply
The first coil of relay is connected between positive pole BAT+.
The described relay drive circuit for portable power source also includes the second drive module；Described relay is double
Input line ring relay, with first coil and the second coil, and shares a pair of output contacts；
The second described drive module includes the second control signal input circuit and 2 N-MOS pipes Q1 and Q2；
Second control signal input circuit includes the resistance R2 and R7 of series connection；The first termination control signal DAT of resistance R2；
Second end of resistance R2 is grounded through resistance R7；The G of 2 N-MOS pipes Q1 and Q2 is extremely shorted to the tie point of resistance R2 and R7；2
The S of individual N-MOS pipes Q1 and Q2 is extremely grounded；It is connected between the D poles of 2 N-MOS pipes Q1 and Q3 and the positive pole BAT+ of accumulation power supply
Second coil of relay.
Resistance R52 and resistance R2 are 1K ohm；Resistance R19 and resistance R7 are 20K ohm.
Ceramic condenser C5 and C6 are connected between the G poles and ground of model 2N7002K, the N-MOS pipe of N-MOS pipes, each
The capacitance of ceramic condenser is 0.1uF, and diode D7, BAT+ and a N-MOS are connected between the D poles of BAT+ and N-MOS pipes Q9
A diode D10 is connected between the D poles of pipe Q1.
CTL-START and DAT are respectively normal control signal and exception control；It is normal to be controlled to user's actively unlatching electric discharge
Switch, switching relay realizes electric discharge；Exception control refers to that one of following 5 kinds of situations occur：
1. clip terminal voltage is too low (being less than 11VDC)
2. clip terminal voltage is too high (being higher than 15VDC)
3. clip is reversed
4. clip short circuit
5. internal wiring temperature is too high；
Case above has correlation detecting circuit to detect.
Referring to Fig. 2, for the current foldback circuit of the automobile starting power supply based on super capacitor, including operational amplifier
U1-B, measurement resistance R18 and boosting protection chip U9；
Measurement resistance R18 is serially connected in the front-end power loop of the automobile starting power supply based on super capacitor；
The first end of measurement resistance R18 connects the in-phase input end of operational amplifier through resistance R39；The of measurement resistance R18
Two ends connect the inverting input of operational amplifier through resistance R36；
Bridging has resistance R40 between the output end and inverting input of operational amplifier；
The output end of operational amplifier connects with the feedback end FB of boosting protection chip U9.
The output end of operational amplifier is connected by diode D20 with the feedback end FB of boosting protection chip U9；And feedback
End FB connects the negative pole of diode D20.
Described front-end power loop is USB current supply circuits (by USB interface for the energy-storage module of startup power supply charges)；
First end ground connection (SGND) of measurement resistance R18；The negative terminal BAT1- of the second termination USB charging inlets J4 of measurement resistance R18.
The model LM258ADR of operational amplifier, the model FP5139 of boosting protection chip U9, resistance R18, R39,
The resistance of R36 and R40 is respectively 0.01 ohm, 1K ohm, 1K ohm and 20K ohm.
It is another to there is a current foldback circuit to be monitored for the output current to energy-storage module, such as Fig. 2, the circuit is transporting
U1-A is put for core；With R31 and R32 in parallel, as measurement resistance, (R31 and R32 are 0.01 ohm, are 0.005 Europe after parallel connection
Nurse)；Cleaning Principle is identical with the principle of the current foldback circuit based on amplifier U1-B.
Fig. 9~10, a kind of detection circuit of startup power supply, including temperature detection branch road, supply voltage detection branch and A/D
Converter；Described A/D converter is multi-channel a/d converter；The output end output testing result data of MD converters；
In temperature detection branch road, thermistor RT1 is connected with supply voltage (5V-VDD), thermistor RT1 and resistance R22
Series connection, resistance R22 ground connection；The first analog signal that the tie point (V07) of thermistor RT1 and resistance R22 connects A/D converter is defeated
Inbound port (AN1)；
In supply voltage detection branch, resistance R66s of the supply voltage Vbout+ (for connecing automobile batteries) through being sequentially connected in series
It is grounded with R67；The tie point (V06) of resistance R66 and R67 connects second input end of analog signal mouthful (AN2) of A/D converter.
The detection circuit of described startup power supply also includes energy-storage module voltage detecting branch road；
In energy-storage module voltage detecting branch road, energy-storage module voltage BAT+ (positive terminal for connecing energy-storage module) is through successively
Resistance R74 and the R75 ground connection of concatenation；The tie point (V08) of resistance R74 and R75 connects the 3rd analog signal input of A/D converter
Port (AN0).
The detection circuit of described startup power supply also includes switch detection branch；In switch detection branch, supply voltage
Resistance R89, the switch SW1 and resistance R21 ground connection of (5V-VDD) through being sequentially connected in series；The tie point of resistance R89 and switch SW1
(CLK) clock signal terminal (CLK/P2.1) of A/D converter is connect.
The model SC8F2712 of described A/D converter；The resistance of thermistor RT1 is 10K ohm；Resistance R22,
The resistance value of R66, R67, R74, R75, R89 and R21 is respectively 10K, 100K, 100K, 301K, 100K, 1M and 100K, and unit is
Ohm.
SW1 presses rear CLK voltages and will produce transfer, and this low and high level variable signal is directly delivered to MCU, performs specific
Function, such as trigger relay realizes electric discharge, and the clock signal of chip internal is generated or outside other pins by chip oneself
There is provided.
U4 inherently MCU, therefore, the transformation result of ADC is supplied to the MCU in U4 by internal circuit (or register)
Module.
Claims (10)
1. a kind of LED drive circuit for automobile starting power supply, it is characterised in that including illumination type LED (D15), red
LED light, green LED indicator lamp and switching device (Q5)；
The positive pole of illumination type LED connects DC power anode (5V-VDD) through the first current-limiting resistance；The negative pole warp of illumination type LED
Switching device is grounded；The control end of switching device connects LED control ports (CTL-LED) through resistance R11；
After the positive pole short circuit of red LED indicator lamp and green LED indicator lamp DC power anode is connect through the second current-limiting resistance (R53)
(5V-VDD)；
The negative pole of red LED indicator lamp and green LED indicator lamp connects red LED lamp control port (LED-R) and green LED respectively
Lamp control port (LED-G).
2. the LED drive circuit for automobile starting power supply according to claim 1, it is characterised in that described switch
Device is managed for N-MOS；The D poles of N-MOS pipes connect the negative pole of illumination type LED；S poles ground connection (SGND) of N-MOS pipes；N-MOS is managed
G poles connecting resistances R11.
3. the LED drive circuit for automobile starting power supply according to claim 2, it is characterised in that the type of N-MOS pipes
Number be 2N7002K.
4. the LED drive circuit for automobile starting power supply according to claim 1, it is characterised in that described switch
Device is the triode of NPN type；The C poles of triode connect the negative pole of illumination type LED；E poles ground connection (SGND) of triode；Three poles
The B poles connecting resistances R11 of pipe.
5. the LED drive circuit for automobile starting power supply according to claim any one of 1-4, it is characterised in that red
Color LED light and green LED indicator lamp use dual-colored LED lamp (D4).
6. the LED drive circuit for automobile starting power supply according to claim 5, it is characterised in that the first current limliting electricity
It is 50 ohm to hinder, and the second current-limiting resistance (R53) is 2.4K ohm, and resistance R11 is 1K ohm.
7. the LED drive circuit for automobile starting power supply according to claim 6, it is characterised in that dc source is just
Extremely 3.3V.
8. the LED drive circuit for automobile starting power supply according to claim 7, it is characterised in that use dual input
Power supply circuit is to be powered for the LED drive circuit and method of automobile starting power supply.
9. the LED drive circuit for automobile starting power supply according to claim 8, it is characterised in that dual input is powered
Circuit has the first power input and second source input, and the first power input is used for the positive pole phase with automobile batteries
Connect；Second source input is used to connect the positive pole of dry cell batteries；Red LED lamp control port (LED-R) and green LED lamp are controlled
Port (LED-G) is the I/O interface of controller, and controller uses SC8F2712 cake cores.
10. a kind of LED driving methods for automobile starting power supply, it is characterised in that using described in claim 9 for vapour
The LED drive circuit of car startup power supply；Using SC8F2712 cake cores as controller；By red LED lamp control port (LED-
) and green LED lamp control port (LED-G) and LED control ports (CTL-LED) control the state of LED lamps R；
Control method is as follows：
(1) during red LED lamp control port (LED-R) output low level, when red；
(2) during green LED lamp control port (LED-G) output low level, green light；
(3) during LED control ports (CTL-LED) high level, Q5 conductings, D15 conductings are luminous.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710048496.3A CN106714384A (en) | 2017-01-22 | 2017-01-22 | Light-emitting diode (LED) drive circuit and LED drive method for automobile starting power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710048496.3A CN106714384A (en) | 2017-01-22 | 2017-01-22 | Light-emitting diode (LED) drive circuit and LED drive method for automobile starting power supply |
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|---|---|
| CN106714384A true CN106714384A (en) | 2017-05-24 |
Family
ID=58910158
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|---|---|---|---|
| CN201710048496.3A Pending CN106714384A (en) | 2017-01-22 | 2017-01-22 | Light-emitting diode (LED) drive circuit and LED drive method for automobile starting power supply |
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