CN205793538U - A kind of LEDbulb lamp circuit of Linear temperature control protection - Google Patents
A kind of LEDbulb lamp circuit of Linear temperature control protection Download PDFInfo
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- CN205793538U CN205793538U CN201620631789.5U CN201620631789U CN205793538U CN 205793538 U CN205793538 U CN 205793538U CN 201620631789 U CN201620631789 U CN 201620631789U CN 205793538 U CN205793538 U CN 205793538U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses the LEDbulb lamp circuit of a kind of Linear temperature control protection; it includes LED drive circuit and temperature protection circuit; LED drive circuit is made up of over-current over-voltage protection unit, rectification filtering unit, switch constant current unit and output unit; temperature protection circuit is made up of negative tempperature coefficient thermistor, reference resistance, temperature detection and control circuit; negative tempperature coefficient thermistor is arranged on LED light source, and output unit connects power supply unit；Advantage is to use negative tempperature coefficient thermistor and reference resistance, and by the first operating temperature point set, when the temperature of LED light source is less than the first operating temperature point, LEDbulb lamp is had no effect by negative tempperature coefficient thermistor；When the temperature of LED light source is equal to or higher than the first operating temperature point, the resistance change of negative tempperature coefficient thermistor, the curent change making LED light source is linear, and the luminosity change of LED light source is unconspicuous, thus without affecting illuminating effect, and LEDbulb lamp will not be made overheated.
Description
Technical field
This utility model relates to a kind of LEDbulb lamp, especially relates to the LEDbulb lamp electricity of a kind of Linear temperature control protection
Road.
Background technology
Startup conventional incandescent production and selling forbidden along with most countries, electric filament lamp will be gradually backed out market,
LEDbulb lamp has started to come into the market in a large number.Owing to the volume of LEDbulb lamp is little, but need to accommodate LED light source, drive power supply
Deng, therefore, on the one hand, LED light source compares concentration, caloric value is big, is easily caused LED light source overheated, not only can make LED light source
Decay of luminescence, and the life-span of LED light source can be affected, thus the life-span of LEDbulb lamp can be affected；On the other hand, power supply is driven
Itself also can generate heat, and drives that power supply is overheated also can affect its function and life-span, thus can affect the life-span of LEDbulb lamp.
In order to prevent LED light source and drive power supply overheated, typically use temperature sensor, by the control of temperature sensor
Reduce the output electric current driving power supply, so that LED light source and the heating reduction of driving power supply prevent LED light source and drive electricity
Source is overheated.But, owing to driving the minimizing of the output electric current of power supply that the luminosity of LED light source can be made to reduce, if therefore control
Make bad, LEDbulb lamp luminescence can be caused to produce the contrast change of light and shade.
It is at any time that the temperature sensor used in existing LEDbulb lamp varies with temperature, i.e. temperature varies slightly, and drives
The output electric current in galvanic electricity source will change therewith, therefore, also can go out in the case of not causing LED light source and driving power supply overheated
The change of the luminosity of existing LED light source；Additionally, some temperature sensor varies with temperature the electric current that can cause LEDbulb lamp
Undergoing mutation, when such as arriving a certain temperature spot, the electric current of LEDbulb lamp diminishes suddenly, causes the luminosity of LED light source to produce
Raw sudden change, thus the illuminating effect of LEDbulb lamp can be affected.
Summary of the invention
Technical problem to be solved in the utility model is to provide the LEDbulb lamp circuit of a kind of Linear temperature control protection, its
LED light source can be effectively prevented or drive power supply overheated, and the luminosity of LED light source can be made to change inconspicuous, thus
Make the good illumination effect of LEDbulb lamp.
The technical scheme that the above-mentioned technical problem of this utility model solution is used is: the LED ball of a kind of Linear temperature control protection
Bubble circuit for lamp, including LED drive circuit, described LED drive circuit by over-current over-voltage protection unit, rectification filtering unit, open
Closing constant current unit and output unit composition, described output unit is connected with the LED light source in LEDbulb lamp；It is characterized in that:
This LEDbulb lamp circuit also includes temperature protection circuit, and described temperature protection circuit is by negative tempperature coefficient thermistor, reference
Resistance, temperature detection and control circuit composition, described negative tempperature coefficient thermistor is arranged on described LED light source, institute
The negative tempperature coefficient thermistor stated is connected with first input of described temperature detection and control circuit, described reference
Resistance is connected with second input of described temperature detection and control circuit, described temperature detection and control circuit defeated
Go out end to be connected with described switch constant current unit；The temperature of described LED light source is equal to or higher than the first operating temperature set
During point, the resistance value of described negative tempperature coefficient thermistor is decreased to the resistance value with described reference resistance quite or more
Little, the electric current of the outfan output of now described temperature detection and control circuit makes described in described output unit supply
The electric current of LED light source linearly reduces, and the power of described LED light source the most linearly reduces, the luminosity of described LED light source
Linearly reducing with linearly the reducing of electric current of described LED light source, the temperature of described LED light source falls after rise.
Described over-current over-voltage protection unit is made up of electric fuse and varistor, and one end of described electric fuse is low with city
Frequently the live wire of alternating current connects, and the other end of described electric fuse is connected with one end of described varistor, and its public company
Connect and hold the cathode output end as described over-current over-voltage protection unit to connect with the electrode input end of described rectification filtering unit
Connecing, the other end of described varistor is connected with the zero line of city's low frequency ac, and its public connecting end is as described mistake
The cathode output end of stream Overvoltage protecting unit is connected with the negative input of described rectification filtering unit.
Described rectification filtering unit is made up of the first inductance, rectifier bridge stack and the π type filter circuit as filter inductance,
Described π type filter circuit is by the second inductance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 5th resistance and the 6th resistor group
Become, one end of the first described inductance as the electrode input end of described rectification filtering unit, the first described inductance another
One end is connected with the electrode input end of described rectifier bridge stack, and the negative input of described rectifier bridge stack is as described rectification
The negative input of filter unit, the cathode output end of described rectifier bridge stack respectively with one end and the institute of the second described inductance
One end of the 4th electric capacity stated connects, the other end of the second described inductance respectively with one end of the 3rd described electric capacity and described
One end of the 5th electric capacity connect, and its public connecting end is as the cathode output end of described rectification filtering unit, described
The other end of the 3rd electric capacity is connected with one end of the 5th described resistance and one end of the 6th described resistance respectively, and described is whole
The stream cathode output end of bridge heap, the other end of the 4th described electric capacity, the described other end of the 5th resistance, the described the 6th electricity
The other end of resistance and the equal ground connection of the other end of the 5th described electric capacity, and its public connecting end is as described rectification filtering unit
Cathode output end.
Described switch constant current unit is driven control chip by the LED that model is TC211, is driven control as described LED
The 3rd resistance starting resistance of coremaking sheet, drive the 7th electric capacity of start-up capacitance of control chip, conduct as described LED
The audion of the switching tube of described switch constant current unit, the second diode as isolating diode, Zener diode and by
Tenth resistance, the 11st resistance, the 12nd resistance, the 5th diode, the current detection circuit of the 6th diode composition, described
Output unit by the main winding of transformator, the first diode as fly-wheel diode, the first electric capacity as filter capacitor,
One resistance and the 9th electric capacity composition, described temperature detection and control circuit are by the temperature measurement and control core that model is TC5001
Sheet, the 15th resistance and the 16th resistance composition, described output unit connects power supply unit, described power supply unit by for
Described LED drives control chip provide the first power supply unit of power supply and provide electricity for described temperature measurement and control chip
Source second power supply unit composition, the first described power supply unit by one of them auxiliary winding of transformator, the second resistance, the 4th
Resistance and the second electric capacity composition, the second described power supply unit is by another auxiliary winding of transformator, as commutation diode
4th diode, filter capacitor, the 7th resistance and the 9th resistance composition；
1st foot of described LED driving control chip is electric with one end of the 3rd described resistance and the described the 7th respectively
The one end held connects, and the described other end of the 3rd resistance is connected with the cathode output end of described rectification filtering unit, described
The other end of the 7th electric capacity and described LED drive the 2nd equal ground connection of foot of control chip, described LED drives control chip
The 3rd foot be connected with the 6th foot of described temperature measurement and control chip and one end of the tenth described resistance respectively, described
The other end of the tenth resistance respectively with one end of the 11st described resistance, one end of the 12nd described resistance, described
The negative pole of the negative pole of five diodes and the 6th described diode connects, the other end of the 11st described resistance and described the
The equal ground connection of the other end of 12 resistance, described LED drives the 4th foot of control chip to connect with the negative pole of the second described diode
Connect, the positive pole of the second described diode respectively with the negative pole of described Zener diode, the base stage of described audion, described
One end of the second electric capacity and one end of the second described resistance connect, the plus earth of described Zener diode, described
The emitter stage of audion is connected with the positive pole of the 5th described diode and the positive pole of the 6th described diode respectively, described
The colelctor electrode of audion respectively with one end, the positive pole of the first described diode and the described transformator of the 9th described electric capacity
Main winding one end connect, the other end of the second described resistance, the described other end of the 9th electric capacity, the described the 1st
One end of the negative pole of pole pipe, the positive pole of the first described electric capacity and the first described resistance another with the 3rd described resistance respectively
One end connects, and its public connecting end is connected with the electrode input end of described LED light source, the main winding of described transformator
The other end other end with the negative pole of the first described electric capacity and the first described resistance respectively is connected, and its public connecting end with
The negative input of described LED light source connects, and the other end of the main winding of described transformator passes through the 6th capacity earth, institute
The LED stated drives the 5th foot of control chip and the 6th foot unsettled, and the other end of the second described electric capacity is by the 4th described electricity
Resistance is connected with one end of one of them auxiliary winding of described transformator, another of one of them auxiliary winding of described transformator
The common port that is connected with one end of another auxiliary winding of described transformator of end respectively with one end of the 9th described resistance and
The negative pole of described filter capacitor connects, and its public connecting end ground connection, another of another auxiliary winding of described transformator
End is connected with the positive pole of the 4th described diode, and the negative pole of the 4th described diode connects with one end of the 7th described resistance
Connecing, the other end of the 7th described resistance connects with the other end of the 9th described resistance and the positive pole of described filter capacitor respectively
Connect, and its public connecting end is respectively with one end of one end of described negative tempperature coefficient thermistor and described reference resistance even
Connect, the 1st foot of described temperature measurement and control chip respectively with the other end and the institute of described negative tempperature coefficient thermistor
The one end of the 16th resistance stated connects, and the 2nd foot of described temperature measurement and control chip, the 3rd foot and the 5th foot connect, and
Its public connecting end is connected with one end of the 15th described resistance, the other end and the described the tenth of the 15th described resistance
The equal ground connection of the other end of six resistance, the 4th foot of described temperature measurement and control chip and the other end of described reference resistance
Connect.
When the temperature of described LED light source is less than the first operating temperature point set, described negative temperature coefficient thermistor power
The resistance value of resistance is much larger than the resistance value of described reference resistance；The temperature of described LED light source is equal to or higher than the set
During 1 operating temperature point, the resistance value of described negative tempperature coefficient thermistor is decreased to and the resistance value of described reference resistance
Quite or less.
The LEDbulb lamp circuit of a kind of Linear temperature control protection, including LED drive circuit, described LED drive circuit is by mistake
Stream Overvoltage protecting unit, rectification filtering unit, switch constant current unit and output unit composition, described output unit and LED ball
LED light source in bubble lamp connects；It is characterized in that: this LEDbulb lamp circuit also includes that temperature protection circuit, described temperature are protected
Protection circuit is made up of negative tempperature coefficient thermistor, reference resistance, temperature detection and control circuit, described negative temperature coefficient heat
The driving electricity that quick resistance is arranged in the LEDbulb lamp being made up of described LED drive circuit and described temperature protection circuit
On source, described negative tempperature coefficient thermistor is connected with first input of described temperature detection and control circuit, institute
The reference resistance stated is connected with second input of described temperature detection and control circuit, described temperature detection and control
The outfan of circuit is connected with described switch constant current unit；Described drives the temperature of power supply equal to or higher than second set
During operating temperature point, the resistance value of described negative tempperature coefficient thermistor is decreased to the resistance value phase with described reference resistance
When or less, the electric current of the outfan output of now described temperature detection and control circuit makes described output unit supply institute
The electric current of the LED light source stated linearly reduces, and the power of described LED light source the most linearly reduces, the luminescence of described LED light source
Brightness linearly reduces with linear reduction of the electric current of described LED light source, simultaneously described in the electric current driving power supply reduce, institute
The temperature driving power supply stated falls after rise.
When the described temperature driving power supply is less than the second operating temperature point set, described negative temperature coefficient thermistor power
The resistance value of resistance is much larger than the resistance value of described reference resistance；The described temperature driving power supply is equal to or higher than the set
During 2 operating temperature points, the resistance value of described negative tempperature coefficient thermistor is decreased to and the resistance value of described reference resistance
Quite or less.
Compared with prior art, the utility model has the advantage of:
This utility model uses negative tempperature coefficient thermistor and reference resistance, by the first operating temperature point set
With the second operating temperature point set, when the temperature of LED light source is less than the first operating temperature point set or drive power supply
When temperature is less than the second operating temperature point set, LEDbulb lamp is had no effect by negative tempperature coefficient thermistor；Work as LED
The temperature of light source is equal to or higher than during the first operating temperature point set or drive the temperature of power supply equal to or higher than the set
During 2 operating temperature points, the resistance change of negative tempperature coefficient thermistor, cause the electric current of LED light source or drive the electricity of power supply
Stream is gradually few, the change of the resistance value of negative tempperature coefficient thermistor and the electric current of LED light source or the change of the electric current driving power supply
Being linear, nearly continuous print, the change of the luminosity of LED light source is unconspicuous, therefore by circuit of the present utility model
Do not interfere with illuminating effect, LEDbulb lamp will not be made overheated simultaneously, it is to avoid light decay and shorten life-span of LEDbulb lamp.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of the LEDbulb lamp circuit of Linear temperature control of the present utility model protection；
Fig. 2 is the circuit diagram of the LEDbulb lamp circuit of Linear temperature control of the present utility model protection；
Fig. 3 is the change linear change figure with analog output current of the resistance value of negative tempperature coefficient thermistor；
When Fig. 4 a is the outfan no current output of temperature detection and control circuit, LED drives the 3rd foot of control chip
Input current signal schematic diagram；
Fig. 4 b be the outfan of temperature detection and control circuit when having electric current to export LED drive the 3rd foot of control chip
Input current signal schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, this utility model is described in further detail.
Embodiment one:
The LEDbulb lamp circuit of a kind of Linear temperature control protection that the present embodiment proposes, as it is shown in figure 1, it includes that LED drives
Circuit and temperature protection circuit, LED drive circuit is by over-current over-voltage protection unit 1, rectification filtering unit 2, switch constant current unit 3
Forming with output unit 4, the input of over-current over-voltage protection unit 1 accesses city's low frequency ac, over-current over-voltage protection unit 1
Outfan is connected with the input of rectification filtering unit 2, the outfan of rectification filtering unit 2 and the first of switch constant current unit 3
Individual input connects, and the outfan of switch constant current unit 3 is connected with the input of output unit 4, and second of output unit 4 defeated
Go out end to be connected with the LED light source in LEDbulb lamp；Temperature protection circuit is by negative tempperature coefficient thermistor NTC (NTC temperature-sensitive electricity
Resistance, reduces with the liter high resistance of temperature), reference resistance Rref, temperature detection and control circuit 6 form, negative temperature coefficient heat
Quick resistance NTC is arranged on LED light source, and first outfan of output unit 4 connects power supply unit 5, power supply unit 5 defeated
Go out end to be connected with one end of negative tempperature coefficient thermistor NTC and one end of reference resistance Rref respectively, negative temperature coefficient heat-sensitive
The other end of resistance NTC is connected with first input of temperature detection and control circuit 6, the other end of reference resistance Rref with
Second input of temperature detection and control circuit 6 connects, the outfan of temperature detection and control circuit 6 and switch constant current list
Second input of unit 3 connects；Negative tempperature coefficient thermistor NTC measures the temperature of LED light source in real time, the temperature of LED light source
When degree is less than the first operating temperature point set, the resistance value of negative tempperature coefficient thermistor NTC is much larger than reference resistance Rref
Resistance value, temperature detection and control circuit 6 outfan no current output；The temperature of LED light source is equal to or higher than setting
During the first operating temperature point, the resistance value of negative tempperature coefficient thermistor NTC linearly reduces, and is decreased to and reference resistance Rref
Resistance value quite or less, the now outfan output electric current of temperature detection and control circuit 6, temperature detection and control circuit
Switching tube in the current-controlled switch constant current unit 3 of the outfan output of 6 turns off or in advance, makes output unit 4 supply
The electric current of LED light source reduces, and the power of LED light source reduces therewith, and the luminosity of LED light source is with the line of the electric current of LED light source
Property reduce and linearly reduce, the temperature of LED light source falls after rise.Owing to the resistance change of negative tempperature coefficient thermistor NTC can be led
Cause the linear change of the electric current of LED light source so that the change of the luminosity of LED light source is continuous print, unconspicuous, therefore may be used
The heat reducing LED light source makes the temperature of LED light source fall after rise, prevents LED light source from producing overheated.
In the present embodiment, the LED light source in LEDbulb lamp is LED lamp bead plate or is COB lamp plate, and LED lamp bead plate is by gold
Belong to wiring board and many LED lamp bead compositions being installed on metal circuit board with series, parallel or series-parallel system.
In the present embodiment, when the temperature of LED light source is less than the first operating temperature point set, negative temperature coefficient thermistor power
The resistance value of the resistance NTC resistance value much larger than reference resistance Rref；The temperature of LED light source is equal to or higher than the first work set
During temperature spot, the resistance value of negative tempperature coefficient thermistor NTC is decreased to the resistance value of reference resistance Rref quite or less.
In the present embodiment, the first operating temperature point of setting can be according to the temperature in the service life affecting LED light source
Point is set, as being set as 80 degrees Celsius.
In this particular embodiment, as in figure 2 it is shown, over-current over-voltage protection unit 1 is by electric fuse F and varistor RV1 group
Becoming, one end of electric fuse F is connected with the live wire of city's low frequency ac, and the other end of electric fuse F connects with one end of varistor RV1
Connect, and the electrode input end of the cathode output end that its public connecting end is as over-current over-voltage protection unit 1 and rectification filtering unit 2
Connecting, the other end of varistor RV1 is connected with the zero line of city's low frequency ac, and its public connecting end is protected as overcurrent-overvoltage
The negative input of the cathode output end and rectification filtering unit 2 that protect unit 1 is connected.When overcurrent-overvoltage protected location 1 runs into electricity
When flowing through big, electric fuse F fuse protection back end device and circuit；Varistor RV1 be connected in parallel on the live wire of city's low frequency ac with
Between zero line, carry out voltage clamp when overcurrent-overvoltage protected location 1 bears overvoltage, absorb unnecessary energy with end-apparatus after protection
Part and circuit.
In this particular embodiment, as in figure 2 it is shown, city's low frequency ac is converted into without exchanging into by rectification filtering unit 2
Point unidirectional current, it is made up of the first inductance L1, rectifier bridge stack BR1 and the π type filter circuit as filter inductance, and π type filters
Circuit is made up of the second inductance L2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 5th resistance R5 and the 6th resistance R6,
One end of first inductance L1 is as the electrode input end of rectification filtering unit 2, the other end of the first inductance L1 and rectifier bridge stack BR1
Electrode input end connect, the negative input of rectifier bridge stack BR1 is as the negative input of rectification filtering unit 2, rectifier bridge
The cathode output end of heap BR1 is connected with one end of the second inductance L2 and one end of the 4th electric capacity C4 respectively, and the second inductance L2's is another
One end is connected with one end of the 3rd electric capacity C3 and one end of the 5th electric capacity C5 respectively, and its public connecting end is as rectifying and wave-filtering list
The cathode output end of unit 2, the other end of the 3rd electric capacity C3 connects with one end of the 5th resistance R5 and one end of the 6th resistance R6 respectively
Connect, the cathode output end of rectifier bridge stack BR1, the other end of the 4th electric capacity C4, the other end of the 5th resistance R5, the 6th resistance R6
The equal ground connection of the other end of the other end and the 5th electric capacity C5, and its public connecting end is as the cathode output end of rectification filtering unit 2.
In this particular embodiment, as in figure 2 it is shown, switch constant current unit 3 is driven by the LED that model is TC211 controls core
Sheet IC1 (upper tiopropamine core microelectronics Science and Technology Ltd. produce), as the 3rd resistance R3 starting LED driving control chip IC1
With the 7th electric capacity C7, the audion Q1 as the switching tube switching constant current unit 3, the second diode as isolating diode
D2, Zener diode ZD1 and by the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 5th diode D5, the 6th
The compositions such as the current detection circuit of diode D6 composition, output unit 4 is by the main winding of transformator TF1, as fly-wheel diode
The first diode D1, the first electric capacity C1, the first resistance R1 as filter capacitor and the 9th electric capacity C9 composition, temperature detection and
Control circuit 6 is by temperature measurement and control chip U1, the 15th resistance R15 and the 16th resistance R16 group that model is TC5001
Becoming, power supply unit 5 is by driving control chip IC1 to provide the first power supply unit of power supply for LED and being temperature measurement and control core
Sheet U1 provides the second power supply unit composition of power supply, and the first power supply unit is by one of them auxiliary winding of transformator TF1, the second electricity
Resistance R2, the 4th resistance R4 and the second electric capacity C2 composition, the second power supply unit is by another auxiliary winding of transformator TF1, as whole
Stream the 4th diode D4 of diode, filter capacitor CD1, the 7th resistance R7 and the 9th resistance R9 composition；LED drives control chip
1st foot of IC1 is connected with one end of the 3rd resistance R3 and one end of the 7th electric capacity C7 respectively, and the other end of the 3rd resistance R3 is with whole
The cathode output end of stream filter unit 2 connects, and the other end of the 7th electric capacity C7 and LED drive the 2nd foot of control chip IC1 all to connect
Ground, LED drive the 3rd foot of control chip IC1 respectively with the 6th foot of temperature measurement and control chip U1 and the tenth resistance R10
One end connects, the other end of the tenth resistance R10 respectively with one end of the 11st resistance R11, one end of the 12nd resistance R12, the
The negative pole of five diode D5 and the negative pole of the 6th diode D6 connect, the other end of the 11st resistance R11 and the 12nd resistance R12
The equal ground connection of the other end, LED drives the negative pole connection of the 4th foot and the second diode D2 of control chip IC1, the second diode D2
Positive pole respectively with negative pole, the base stage of audion Q1, one end of the second electric capacity C2 and the second resistance R2 of Zener diode ZD1
One end connects, the plus earth of Zener diode ZD1, the emitter stage of audion Q1 respectively with the positive pole of the 5th diode D5 and the
The positive pole of six diode D6 connects, and the colelctor electrode of audion Q1 is respectively with one end of the 9th electric capacity C9, the first diode D1 just
One end of the main winding of pole and transformator TF1 connects, the other end of the second resistance R2, the other end of the 9th electric capacity C9, the one or two
One end of the negative pole of pole pipe D1, the positive pole of the first electric capacity C1 and the first resistance R1 other end with the 3rd resistance R3 respectively is connected,
And its public connecting end is connected with the electrode input end of LED light source, the other end of the main winding of transformator TF1 is electric with first respectively
The other end of the negative pole and the first resistance R1 that hold C1 connects, and its public connecting end is connected with the negative input of LED light source, becomes
The other end of the main winding of depressor TF1 passes through the 6th electric capacity C6 ground connection, and LED drives the 5th foot of control chip IC1 and the 6th foot to hang
Sky, the other end of the second electric capacity C2 is connected with one end of one of them auxiliary winding of transformator TF1 by the 4th resistance R4, transformation
The common port that the other end of one of them auxiliary winding of device TF1 is connected with one end of another auxiliary winding of transformator TF1 is respectively
It is connected with one end of the 9th resistance R9 and the negative pole of filter capacitor CD1, and its public connecting end ground connection, another of transformator TF1
The other end of individual auxiliary winding and the positive pole of the 4th diode D4 connect, the negative pole of the 4th diode D4 and one end of the 7th resistance R7
Connecting, the other end of the 7th resistance R7 is connected with the other end of the 9th resistance R9 and the positive pole of filter capacitor CD1 respectively, and it is public
Altogether connect end is connected with one end of negative tempperature coefficient thermistor NTC and one end of reference resistance Rref respectively, temperature detection with
1st foot of control chip U1 connects with the other end of negative tempperature coefficient thermistor NTC and one end of the 16th resistance R16 respectively
Connecing, the 2nd foot of temperature measurement and control chip U1, the 3rd foot and the 5th foot connect, and its public connecting end and the 15th resistance R15
One end connect, the other end of the 15th resistance R15 and the equal ground connection of the other end of the 16th resistance R16, temperature measurement and control
4th foot of chip U1 is connected with the other end of reference resistance Rref.
Embodiment two:
The Linear temperature control that the LEDbulb lamp circuit of a kind of Linear temperature control protection that the present embodiment proposes is given with embodiment one
The difference of the LEDbulb lamp circuit of protection is, negative tempperature coefficient thermistor NTC is arranged at LED ball by the present embodiment
On driving power supply in bubble lamp.As it is shown in figure 1, the LEDbulb lamp circuit of the Linear temperature control protection of the present embodiment includes that LED drives
Circuit and temperature protection circuit, LED drive circuit is by over-current over-voltage protection unit 1, rectification filtering unit 2, switch constant current unit 3
Forming with output unit 4, the input of over-current over-voltage protection unit 1 accesses city's low frequency ac, over-current over-voltage protection unit 1
Outfan is connected with the input of rectification filtering unit 2, the outfan of rectification filtering unit 2 and the first of switch constant current unit 3
Individual input connects, and the outfan of switch constant current unit 3 is connected with the input of output unit 4, and second of output unit 4 defeated
Go out end to be connected with the LED light source in LEDbulb lamp；Temperature protection circuit is by negative tempperature coefficient thermistor NTC (NTC temperature-sensitive electricity
Resistance, reduces with the liter high resistance of temperature), reference resistance Rref, temperature detection and control circuit 6 form, negative temperature coefficient heat
Quick resistance NTC is arranged on the driving power supply in the LEDbulb lamp being made up of LED drive circuit and temperature protection circuit, output
First outfan of unit 4 connects power supply unit 5, the outfan of power supply unit 5 respectively with negative tempperature coefficient thermistor
One end of NTC and one end of reference resistance Rref connect, the other end of negative tempperature coefficient thermistor NTC and temperature detection and control
First input of circuit 6 processed connects, and the other end of reference resistance Rref is defeated with second of temperature detection and control circuit 6
Entering end to connect, the outfan of temperature detection and control circuit 6 is connected with second input of switch constant current unit 3；Negative temperature
Coefficient resistance NTC measures the temperature driving power supply in real time, drives the temperature of power supply less than the second operating temperature point set
Time, the resistance value of the negative tempperature coefficient thermistor NTC resistance value much larger than reference resistance Rref, temperature detection and control circuit
The outfan no current output of 6；When the temperature driving power supply equals to or higher than the second operating temperature point set, negative temperature coefficient
The resistance value of critesistor NTC linearly reduces, and is decreased to the resistance value of reference resistance Rref quite or less, now temperature
The outfan output electric current of detection and control circuit 6, the current-controlled switch of the outfan output of temperature detection and control circuit 6
Switching tube in constant current unit 3 turns off or in advance, and the electric current making output unit 4 supply LED light source reduces, described LED
The power of light source reduces therewith, and the luminosity of described LED light source is line with linear reduction of the electric current of described LED light source
Property reduce, simultaneously drive power supply electric current reduce, drive power supply temperature fall after rise.Due to negative tempperature coefficient thermistor NTC's
Resistance change may result in the linear change of the electric current of LED light source so that the change of the luminosity of LED light source is continuous print,
Unconspicuous, make the electric current of driving power supply reduce simultaneously, heat reduces makes the temperature of driving power supply fall after rise, prevents from driving power supply mistake
Heat.
In the present embodiment, power supply is driven to use non-isolated power supply or insulating power supply.
In the present embodiment, when driving the temperature of power supply to be less than the second operating temperature point set, negative temperature coefficient heat-sensitive
The resistance value of the resistance NTC resistance value much larger than reference resistance Rref；Drive the temperature of power supply equal to or higher than second set
During operating temperature point, the resistance value of negative tempperature coefficient thermistor NTC be decreased to the resistance value with reference resistance Rref quite or
Less.
In the present embodiment, the second operating temperature point of setting is by the temperature in the service life that can drive light source according to impact
Degree point is set, as being set as 60 degrees Celsius.
In the present embodiment, the concrete electricity of the LEDbulb lamp circuit that physical circuit is protected with the Linear temperature control of embodiment one
Road is identical.
The LEDbulb lamp circuit of Linear temperature control of the present utility model protection, when the temperature of LED light source is less than first set
During operating temperature point or when driving the temperature of power supply to be less than the second operating temperature point set, negative tempperature coefficient thermistor NTC
Resistance value much larger than the resistance value of reference resistance Rref, the outfan no current output of temperature detection and control circuit 6, LED
The 3rd foot driving control chip IC1 is gradually increased to producing reference voltage from zero by current detection circuit input current, electric current
Vref, now LED drives the 4th foot one voltage signal of output of control chip IC1 to control the audion Q1's as switching tube
Turn off or on；When LED light source temperature equal to or higher than set the first operating temperature point time or drive power supply temperature etc.
In or higher than set the second operating temperature point time, the resistance value of negative tempperature coefficient thermistor NTC linearly reduces, and is decreased to
With the resistance value of reference resistance Rref quite or less, the electric current Iout of the outfan output of temperature detection and control circuit 6 with
The electric current superposition of current detection circuit input, input LED drives the 3rd foot of control chip IC1 together, due to temperature detection and control
The extracurrent that circuit 6 processed provides, therefore LED drives the voltage superposition at the 3rd foot of control chip IC1, rapidly increases to base
Quasi-voltage Vref, the voltage causing LED to drive the 4th foot of control chip IC1 to export reaches threshold value in advance to be made as switching tube
Audion Q1 closes in advance, so makes to export in output unit 4 to the electric current reduction of LED light source, and the power of LED light source subtracts therewith
Little, the temperature of LED light source or driving power supply falls after rise, and such LED light source or driving power supply keep steady temperature work, LED ball bubble
Lamp keeps steady operation, reduces light decay, and extends the life-span of LEDbulb lamp.
Fig. 3 gives the change of the resistance value of negative tempperature coefficient thermistor and the linear change figure of analog output current,
(such as larger than 1000 ohm), temperature detection and control circuit 6 when the resistance value of negative tempperature coefficient thermistor NTC is sufficiently large
Outfan does not has electric current to export；When negative tempperature coefficient thermistor NTC resistance value reduce time to certain value time (such as less than 1000
Ohm), the electric current of the outfan output of temperature detection and control circuit 6 is more than zero；Along with negative tempperature coefficient thermistor NTC's
The reduction of resistance value, the electric current of the outfan output of temperature detection and control circuit 6 occurs that class linearly increases, inputs to switch perseverance
Stream unit 3, controls output unit 4, makes output occur that class linearly reduces to the electric current of LED light source, and the power class of LED light source is linear
Reducing, the power reduction of LED light source makes the heating of LED light source reduce, and the brightness of LED light source will not be made to reduce suddenly simultaneously, reach
Heating and brightness to accurately regulation LED light source.
When Fig. 4 a gives the outfan no current output of temperature detection and control circuit, LED drives the 3rd of control chip
The input current signal schematic diagram of foot, Fig. 4 b gives LED when the outfan of temperature detection and control circuit has electric current to export and drives
The input current signal schematic diagram of the 3rd foot of dynamic control chip.In Fig. 4 a and Fig. 4 b, Vcs represents that LED drives control chip IC1
The 3rd foot at voltage, VrefRepresent that LED drives control chip IC1 to control the threshold voltage that audion Q1 closes, now LED light
The electric current in source is Iled=1/2Vref, IoutRepresent the electric current of the outfan output of temperature detection and control circuit 6, (Iout*Rtemp)
The electric current exported for the outfan of temperature detection and control circuit 6 flows through the tenth resistance R10, the 11st resistance R11 and the 12nd
The pressure drop formed during resistance R12, RtempIt it is the resistance value of the tenth resistance R10, the 11st resistance R11 and the 12nd resistance R12
And value, now the electric current of LED light source is Iled≈1/2(Vref–Iout*Rtemp), current capacity linearly reduces, the power fall of LED light source
Low, the heating of LED light source reduces.When the resistance value of negative tempperature coefficient thermistor NTC increases, cause temperature detection and control
The electric current of the outfan output of circuit 6 is decreased to zero, and the electric current of LED light source increases, and returns to initial state.
Claims (7)
1. a LEDbulb lamp circuit for Linear temperature control protection, including LED drive circuit, described LED drive circuit is by excessively flowing
Overvoltage protecting unit, rectification filtering unit, switch constant current unit and output unit composition, described output unit steeps with LED ball
LED light source in lamp connects；It is characterized in that: this LEDbulb lamp circuit also includes temperature protection circuit, described temperature protection
Circuit is made up of negative tempperature coefficient thermistor, reference resistance, temperature detection and control circuit, described negative temperature coefficient heat-sensitive
Resistance is arranged on described LED light source, described negative tempperature coefficient thermistor and described temperature detection and control circuit
First input connect, second input of described reference resistance and described temperature detection and control circuit is even
Connecing, described temperature detection and the outfan of control circuit are connected with described switch constant current unit；The temperature of described LED light source
When degree is equal to or higher than the first operating temperature point set, the resistance value of described negative tempperature coefficient thermistor is decreased to and institute
The resistance value of the reference resistance stated quite or less, the electric current of the outfan output of now described temperature detection and control circuit
The electric current making the described LED light source described in output unit supply linearly reduces, and the power of described LED light source the most linearly subtracts
Little, the luminosity of described LED light source linearly reduces, described LED with linear reduction of the electric current of described LED light source
The temperature of light source falls after rise.
The LEDbulb lamp circuit of a kind of Linear temperature control the most according to claim 1 protection, it is characterised in that described crosses stream
Overvoltage protecting unit is made up of electric fuse and varistor, and one end of described electric fuse connects with the live wire of city's low frequency ac
Connecing, the other end of described electric fuse is connected with one end of described varistor, and its public connecting end is as described mistake
The cathode output end of stream Overvoltage protecting unit is connected with the electrode input end of described rectification filtering unit, described varistor
The other end be connected with the zero line of city's low frequency ac, and negative as described over-current over-voltage protection unit of its public connecting end
Pole outfan is connected with the negative input of described rectification filtering unit.
The LEDbulb lamp circuit of a kind of Linear temperature control the most according to claim 1 protection, it is characterised in that described rectification
Filter unit is made up of the first inductance, rectifier bridge stack and the π type filter circuit as filter inductance, described π type filter circuit
It is made up of the second inductance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 5th resistance and the 6th resistance, the first described inductance
One end is as the electrode input end of described rectification filtering unit, the other end of the first described inductance and described rectifier bridge stack
Electrode input end connect, the negative input of described rectifier bridge stack as described rectification filtering unit negative pole input
End, the cathode output end of described rectifier bridge stack respectively with one end of the second described inductance and one end of the 4th described electric capacity
Connecting, the other end of the second described inductance connects with one end of the 3rd described electric capacity and one end of the 5th described electric capacity respectively
Connect, and its public connecting end divides as the cathode output end of described rectification filtering unit, the other end of the 3rd described electric capacity
It is not connected with one end of the 5th described resistance and one end of the 6th described resistance, the negative pole output of described rectifier bridge stack
End, the described other end of the 4th electric capacity, the other end of the 5th described resistance, the other end of the 6th described resistance and described
The equal ground connection of the other end of the 5th electric capacity, and its public connecting end is as the cathode output end of described rectification filtering unit.
The LEDbulb lamp circuit of a kind of Linear temperature control the most according to claim 1 protection, it is characterised in that described switch
Constant current unit is driven control chip by LED that model is TC211, is driven the resistance that starts of control chip as described LED
3rd resistance, drive the 7th electric capacity of the start-up capacitance of control chip as described LED, as described switch constant current unit
The audion of switching tube, the second diode as isolating diode, Zener diode and by the tenth resistance, the 11st electricity
Resistance, the 12nd resistance, the 5th diode, the current detection circuit of the 6th diode composition, described output unit is by transformator
Main winding, the first diode as fly-wheel diode, the first electric capacity as filter capacitor, the first resistance and the 9th electric capacity
Composition, described temperature detection and control circuit by the temperature measurement and control chip that model is TC5001, the 15th resistance and
16th resistance composition, described output unit connects power supply unit, and described power supply unit is driven control by for described LED
Coremaking sheet provides the first power supply unit of power supply and provides the second power supply list of power supply for described temperature measurement and control chip
Unit's composition, the first described power supply unit is by one of them auxiliary winding of transformator, the second resistance, the 4th resistance and the second electric capacity
Composition, the second described power supply unit is by another auxiliary winding of transformator, the 4th diode as commutation diode, filtering
Electric capacity, the 7th resistance and the 9th resistance composition；
Described LED drive the 1st foot of control chip respectively with one end of the 3rd described resistance and the 7th described electric capacity
One end connects, and the described other end of the 3rd resistance is connected with the cathode output end of described rectification filtering unit, and described the
The other end of seven electric capacity and described LED drive the 2nd equal ground connection of foot of control chip, and described LED drives the 3rd of control chip
Foot is connected with the 6th foot of described temperature measurement and control chip and one end of the tenth described resistance respectively, described the tenth
The other end of resistance respectively with one end of the 11st described resistance, described one end of the 12nd resistance, the described the 5th 2
The negative pole of pole pipe and the negative pole of the 6th described diode connect, the other end and the described the 12nd of the 11st described resistance
The equal ground connection of the other end of resistance, described LED drives the 4th foot of control chip to be connected with the negative pole of the second described diode,
The positive pole of the second described diode respectively with the negative pole of described Zener diode, the base stage of described audion, described
One end of second electric capacity and one end of the second described resistance connect, the plus earth of described Zener diode, described three
The emitter stage of pole pipe is connected with the positive pole of the 5th described diode and the positive pole of the 6th described diode respectively, described three
The colelctor electrode of pole pipe respectively with one end, the positive pole of the first described diode and the described transformator of the 9th described electric capacity
One end of main winding connects, the other end of the second described resistance, the other end of the 9th described electric capacity, the one or two described pole
One end of the negative pole of pipe, the positive pole of the first described electric capacity and the first described resistance respectively with another of the 3rd described resistance
End connects, and its public connecting end is connected with the electrode input end of described LED light source, the main winding of described transformator another
One end other end with the negative pole of the first described electric capacity and the first described resistance respectively is connected, and its public connecting end and institute
The negative input of the LED light source stated connects, and the other end of the main winding of described transformator passes through the 6th capacity earth, described
LED drive the 5th foot of control chip and the 6th foot unsettled, the other end of the second described electric capacity is by the 4th described resistance
It is connected with one end of one of them auxiliary winding of described transformator, the other end of one of them auxiliary winding of described transformator
The common port being connected with one end of another auxiliary winding of described transformator respectively with one end and the institute of the 9th described resistance
The negative pole of the filter capacitor stated connects, and its public connecting end ground connection, the other end of another auxiliary winding of described transformator
Being connected with the positive pole of the 4th described diode, the negative pole of the 4th described diode connects with one end of the 7th described resistance
Connecing, the other end of the 7th described resistance connects with the other end of the 9th described resistance and the positive pole of described filter capacitor respectively
Connect, and its public connecting end is respectively with one end of one end of described negative tempperature coefficient thermistor and described reference resistance even
Connect, the 1st foot of described temperature measurement and control chip respectively with the other end and the institute of described negative tempperature coefficient thermistor
The one end of the 16th resistance stated connects, and the 2nd foot of described temperature measurement and control chip, the 3rd foot and the 5th foot connect, and
Its public connecting end is connected with one end of the 15th described resistance, the other end and the described the tenth of the 15th described resistance
The equal ground connection of the other end of six resistance, the 4th foot of described temperature measurement and control chip and the other end of described reference resistance
Connect.
The LEDbulb lamp circuit of a kind of Linear temperature control the most according to claim 1 protection, it is characterised in that described LED
When the temperature of light source is less than the first operating temperature point set, the resistance value of described negative tempperature coefficient thermistor is much larger than institute
The resistance value of the reference resistance stated；When the temperature of described LED light source is equal to or higher than the first operating temperature point set, described
The resistance value of negative tempperature coefficient thermistor be decreased to the resistance value of described reference resistance quite or less.
6. a LEDbulb lamp circuit for Linear temperature control protection, including LED drive circuit, described LED drive circuit is by excessively flowing
Overvoltage protecting unit, rectification filtering unit, switch constant current unit and output unit composition, described output unit steeps with LED ball
LED light source in lamp connects；It is characterized in that: this LEDbulb lamp circuit also includes temperature protection circuit, described temperature protection
Circuit is made up of negative tempperature coefficient thermistor, reference resistance, temperature detection and control circuit, described negative temperature coefficient heat-sensitive
Resistance is arranged at the driving power supply in the LEDbulb lamp being made up of described LED drive circuit and described temperature protection circuit
On, described negative tempperature coefficient thermistor is connected with first input of described temperature detection and control circuit, described
Reference resistance be connected with second input of described temperature detection and control circuit, described temperature detection and control electricity
The outfan on road is connected with described switch constant current unit；Described drives the temperature of power supply equal to or higher than the second work set
When making temperature spot, the resistance value of described negative tempperature coefficient thermistor is decreased to suitable with the resistance value of described reference resistance
Or less, the electric current of the outfan output of now described temperature detection and control circuit makes described output unit supply described
The electric current of LED light source linearly reduce, the power of described LED light source the most linearly reduces, the luminance of described LED light source
Spend linear reduction of the electric current with described LED light source and linearly reduce, simultaneously described in the electric current driving power supply reduce, described
Drive power supply temperature fall after rise.
The LEDbulb lamp circuit of a kind of Linear temperature control the most according to claim 6 protection, it is characterised in that described driving
When the temperature of power supply is less than the second operating temperature point set, the resistance value of described negative tempperature coefficient thermistor is much larger than institute
The resistance value of the reference resistance stated；When the described temperature driving power supply equals to or higher than the second operating temperature point set, institute
The resistance value of the negative tempperature coefficient thermistor stated is decreased to the resistance value of described reference resistance quite or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620631789.5U CN205793538U (en) | 2016-06-22 | 2016-06-22 | A kind of LEDbulb lamp circuit of Linear temperature control protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620631789.5U CN205793538U (en) | 2016-06-22 | 2016-06-22 | A kind of LEDbulb lamp circuit of Linear temperature control protection |
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| Publication Number | Publication Date |
|---|---|
| CN205793538U true CN205793538U (en) | 2016-12-07 |
Family
ID=58130221
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620631789.5U Withdrawn - After Issue CN205793538U (en) | 2016-06-22 | 2016-06-22 | A kind of LEDbulb lamp circuit of Linear temperature control protection |
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| CN (1) | CN205793538U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106131994A (en) * | 2016-06-22 | 2016-11-16 | 浙江阳光美加照明有限公司 | A kind of LEDbulb lamp circuit of Linear temperature control protection |
| CN108347806A (en) * | 2018-03-15 | 2018-07-31 | 常州阿拉丁照明科技股份有限公司 | A kind of linear power supply that suitable lamp bead is linearly arranged arrangement circuit |
| CN108848595A (en) * | 2018-07-24 | 2018-11-20 | 浙江阳光美加照明有限公司 | A kind of temperature control protection driving circuit of LEDbulb lamp |
-
2016
- 2016-06-22 CN CN201620631789.5U patent/CN205793538U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106131994A (en) * | 2016-06-22 | 2016-11-16 | 浙江阳光美加照明有限公司 | A kind of LEDbulb lamp circuit of Linear temperature control protection |
| CN108347806A (en) * | 2018-03-15 | 2018-07-31 | 常州阿拉丁照明科技股份有限公司 | A kind of linear power supply that suitable lamp bead is linearly arranged arrangement circuit |
| CN108848595A (en) * | 2018-07-24 | 2018-11-20 | 浙江阳光美加照明有限公司 | A kind of temperature control protection driving circuit of LEDbulb lamp |
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