The content of the invention
It is an object of the invention to provide a kind of lithium battery heater circuit of LED lamp, it is intended to solve present lithium ionBattery there is a problem of discharging in the case where temperature is too low.
The present invention is achieved in that a kind of LED lamp lithium battery heater circuit, is connected with lithium battery, the LED lampLithium battery heater circuit includes：
Resistance R1, pull-up resistor R2, resistance R3, resistance R4, resistance R5, NTC thermistor R6, divider resistance R7, pull-upResistance R8, compensation resistance R9, sampling resistor R10, sampling resistor R11, adding thermal resistance component, filter capacitor C1, storage capacitor C2,Start-up capacitance C3, compensating electric capacity C4, control chip U1, three-terminal voltage-stabilizing chip U2, constant pressure integrated chip U3, energy storage inductor L1, twoPole pipe D1, switch S1, metal-oxide-semiconductor Q1 and switching tube；
The power end VCC of the control chip U1 connects positive source, and the output control terminal PB2 of the control chip U1 passes throughThe resistance R5 connects the control end of the switching tube, and the on off state test side PB1 of the control chip U1 is by the pull-upResistance R2 connects positive source, and is grounded by the switch S1, and the battery temperature test side PB0 of the control chip U1 passes throughThe divider resistance R7 connects reference voltage input PB4 of the control chip U1, and is connect by NTC thermistor R6Ground, the ground terminal GND ground connection of the control chip U1, output end PB3 of the control chip U1 pass through the resistance R1 and three endsVoltage stabilizing chip U2 is grounded, the public connecting end and the control end of three-terminal voltage-stabilizing chip U2 of the resistance R1 and three-terminal voltage-stabilizing chip U2Reference voltage input PB4 of the control chip U1 is connect simultaneously, and the filter capacitor C1 is connected to the positive source with groundBetween, the resistance R3 and resistance R4 of the concatenation are connected between the positive source and the hot end of switching tube, described to openThe cold end ground connection of pipe is closed, the source electrode of the metal-oxide-semiconductor Q1 connects positive source, and the grid of the metal-oxide-semiconductor Q1 meets the resistance R3With the public connecting end of resistance R4, the drain electrode of the metal-oxide-semiconductor Q1 meets the first end of the energy storage inductor L1, the energy storage inductor L1The second termination diode D1 anode, the power input Vin of constant pressure integrated chip U3 connects the energy storage inductorThe first end of L1, the output switch end SW of constant pressure integrated chip U3 connect second end of the energy storage inductor L1, the constant pressureThe job control end SHDN of integrated chip U3 connects the drain electrode of the metal-oxide-semiconductor Q1 by the pull-up resistor R8, and the constant pressure is integratedThe frequency of chip U3 selects end FSEL ground connection, soft start end SS of constant pressure integrated chip U3 to connect by the start-up capacitance C3Ground, the ground terminal GND ground connection of constant pressure integrated chip U3, the compensation end COMP of constant pressure integrated chip U3 pass through the benefit of series connectionResistance R9 and compensating electric capacity C4 ground connection are repaid, the sampling resistor R10 and sampling resistor R11 is connected on the negative electrode of the diode D1Between ground, the voltage sample feedback end FB of constant pressure integrated chip U3 connects the sampling resistor R10's and sampling resistor R11Public connecting end, the adding thermal resistance component are arranged on the lithium battery surface, and are connected to the negative electrode of the diode D1Between ground.
Another object of the present invention is to provide a kind of LED lamp including above-mentioned LED lamp lithium battery heater circuit.
In the present invention, lithium battery temperature is constantly detected by NTC thermistor, control is less than when lithium battery temperature is detectedAt a temperature of the setting of coremaking piece U1 Programs during limit value, control chip U1 output high level driving switch pipe conductings, then metal-oxide-semiconductorAlso into conducting state, constant pressure integrated chip U3 must establish beginning boosting work by cable to Q1, provide stable driving for subsequent heat resistanceVoltage, adding thermal resistance component obtain it is electric after heated for lithium battery, on the contrary when lithium battery temperature is higher than control chip U1 ProgramsDuring the temperature upper limit of setting, adding thermal resistance component power down is no longer heated for lithium battery, and lithium battery temperature slowly can be reduced, whenLithium battery temperature is again below at a temperature of the setting of control chip U1 Programs, during limit value, heater circuit is again started up, and follows successivelyRing, it is ensured that lithium battery temperature is in setting range.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is below in conjunction with drawings and Examples, rightThe present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, andIt is not used in the restriction present invention.
Fig. 1 shows the circuit structure of the LED lamp lithium battery heater circuit that first embodiment of the invention is provided, in order to justIn explanation, the part related to the embodiment of the present invention is illustrate only, details are as follows：
A kind of LED lamp lithium battery heater circuit, is connected with lithium battery, and LED lamp lithium battery heater circuit includes：
Resistance R1, pull-up resistor R2, resistance R3, resistance R4, resistance R5, NTC thermistor R6, divider resistance R7, pull-upResistance R8, compensation resistance R9, sampling resistor R10, sampling resistor R11, adding thermal resistance component 200, filter capacitor C1, storage capacitorC2, start-up capacitance C3, compensating electric capacity C4, control chip U1, three-terminal voltage-stabilizing chip U2, constant pressure integrated chip U3, energy storage inductor L1,Diode D1, switch S1, metal-oxide-semiconductor Q1 and switching tube 100；
The power end VCC of control chip U1 connects power supply BT positive poles, and the output control terminal PB2 of control chip U1 passes through resistance R5The control end of switching tube 100 is connect, the on off state test side PB1 of control chip U1 connects power supply BT positive poles by pull-up resistor R2,And by switching S1 ground connection, the battery temperature test side PB0 of control chip U1 connects control chip U1's by divider resistance R7Reference voltage input PB4, and be grounded by NTC thermistor R6, the ground terminal GND ground connection of control chip U1, control chipOutput end PB3 of U1 passes through resistance R1 and three-terminal voltage-stabilizing chip U2 and is grounded, and resistance R1 is commonly connected with three-terminal voltage-stabilizing chip U2'sThe control end of end and three-terminal voltage-stabilizing chip U2 connects reference voltage input PB4 of control chip U1, filter capacitor C1 connections simultaneouslyBetween power supply BT positive poles and ground, the resistance R3 and resistance R4 of concatenation are connected to the high potential of power supply BT positive poles and switching tube 100Between end, the cold end ground connection of switching tube 100, the source electrode of metal-oxide-semiconductor Q1 connect power supply BT positive poles, the grid connecting resistance of metal-oxide-semiconductor Q1The public connecting end of R3 and resistance R4, the drain electrode of metal-oxide-semiconductor Q1 connect the first end of energy storage inductor L1, second termination of energy storage inductor L1The anode of diode D1, the power input Vin of constant pressure integrated chip U3 connect the first end of energy storage inductor L1, constant pressure integrated chipThe output switch end SW of U3 connects second end of energy storage inductor L1, and the job control end SHDN of constant pressure integrated chip U3 is by pulling up electricityResistance R8 connects the drain electrode of metal-oxide-semiconductor Q1, and the frequency of constant pressure integrated chip U3 selects end FSEL ground connection, the soft start of constant pressure integrated chip U3End SS is grounded by start-up capacitance C3, the ground terminal GND ground connection of constant pressure integrated chip U3, the compensation end COMP of constant pressure integrated chip U3It is grounded by the compensation resistance R9 and compensating electric capacity C4 that connect, sampling resistor R10 and sampling resistor R11 is connected on diode D1'sBetween negative electrode and ground, the voltage sample feedback end FB of constant pressure integrated chip U3 connects the public of sampling resistor R10 and sampling resistor R11Connection end, adding thermal resistance component 200 are arranged on lithium battery surface, and are connected between the negative electrode and ground of diode D1.
Used as one embodiment of the invention, switching tube 100 adopts NPN type triode Q2, and the base stage of NPN type triode Q2 is to openClose pipe 100 control end, the hot end of the current collection extremely switching tube 100 of NPN type triode Q2, NPN type triode Q2 send outCold end of the emitter-base bandgap grading for switching tube 100.
Fig. 2 shows the circuit structure of the LED lamp lithium battery heater circuit that second embodiment of the invention is provided, in order to justIn explanation, the part related to the embodiment of the present invention is illustrate only, details are as follows：
Used as one embodiment of the invention, switching tube 100 adopts N-type metal-oxide-semiconductor Q3, and the grid of N-type metal-oxide-semiconductor Q3 is switching tube100 control end, the drain electrode of N-type metal-oxide-semiconductor Q3 are the hot end of switching tube 100, and the source electrode of N-type metal-oxide-semiconductor Q3 is switching tube 100Cold end.
So that switching tube 100 is using NPN type triode Q2 as an example, the operation principle of LED lamp lithium battery heater circuit is enteredRow explanation：
First, user as needed, by the program in editor control chip U1, arranges temperature upper limit and lowest temperatureValue.
When switch S 1 is not pressed, control chip U1 is in dormancy holding state, NPN type triode Q2 and metal-oxide-semiconductorQ1 is in cut-off state, constant pressure integrated chip U3 not it is electric, be also at dormancy holding state, export to adding thermal resistance without electric energyComponent 200, does not now heat to lithium battery.
When under switching S1 and be pressed for the first time, control chip U1 starts start-up operation, NTC temperature-sensitives electricity after sampling signalResistance R6 constantly detects lithium battery temperature, and control chip U1 receives lithium battery temperature signal by battery temperature test side PB0, works as inspectionWhen the lithium battery temperature for measuring is less than limit value at a temperature of the setting of control chip U1 Programs, the output control terminal of control chip U1PB2 output high level drives the conducting of NPN type triode Q2, then metal-oxide-semiconductor Q1 is obtained also into conducting state, constant pressure integrated chip U3Establish beginning boosting work by cable, be that subsequent heat resistor assembly 200 provides stable driving voltage, adding thermal resistance component 200 it is electric afterHeated for lithium battery.When temperature upper limit of the lithium battery temperature higher than the setting of control chip U1 Programs, control chipThe output control terminal PB2 output low levels of U1, NPN type triode Q2 enter cut-off state by turning on, then metal-oxide-semiconductor Q1 is also by leadingLogical to enter cut-off state, constant pressure integrated chip U3 current supply circuit is cut off, the also power down of adding thermal resistance component 200, is no longer lithium electricityPond is heated, and lithium battery temperature slowly can be reduced, at a temperature of lithium battery temperature is again below the setting of control chip U1 ProgramsDuring limit value, the control chip U1 above-mentioned lithium battery heater circuit work of secondary control again is circulated, it is ensured that lithium battery temperature is in setting successivelyIn temperature range.
When second by compress switch S1 when, that is, close whole circuit, control chip U1 enters resting state.
The embodiment of the present invention also provides a kind of LED lamp, including lithium battery, and LED lamp also includes being connected such as with lithium batteryUpper described LED lamp lithium battery heater circuit.
In embodiments of the present invention, lithium battery temperature is constantly detected by NTC thermistor, when detecting lithium battery temperatureLess than at a temperature of the setting of control chip U1 Programs, during limit value, control chip U1 output high level driving switch pipes are turned on, thatAlso into conducting state, constant pressure integrated chip U3 must establish beginning boosting work by cable to metal-oxide-semiconductor Q1, provide stable for subsequent heat resistanceDriving voltage, adding thermal resistance component obtain it is electric after heated for lithium battery, on the contrary when lithium battery temperature is higher than control chip U1During the temperature upper limit of Program setting, adding thermal resistance component power down is no longer heated for lithium battery, and lithium battery temperature slowly can dropIt is low, when lithium battery temperature again below control chip U1 Programs setting at a temperature of limit value when, heater circuit is again started up, according toSecondary circulation, it is ensured that lithium battery temperature is in setting range.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present inventionAny modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.