CN106131994B - 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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- CN106131994B CN106131994B CN201610466939.6A CN201610466939A CN106131994B CN 106131994 B CN106131994 B CN 106131994B CN 201610466939 A CN201610466939 A CN 201610466939A CN 106131994 B CN106131994 B CN 106131994B
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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]
Abstract
The invention discloses a kind of LEDbulb lamp circuits of Linear temperature control protection; it includes LED drive circuit and temperature protection circuit; LED drive circuit is made of over-current over-voltage protection unit, rectification filtering unit, switch constant current unit and output unit; temperature protection circuit is made of negative tempperature coefficient thermistor, reference resistance, temperature detection and control circuit; negative tempperature coefficient thermistor is set on LED light source, and output unit is connected with power supply unit；Advantage is using negative tempperature coefficient thermistor and reference resistance, and by the first operating temperature point of setting, when the temperature of LED light source is lower than the first operating temperature point, negative tempperature coefficient thermistor has no effect to LEDbulb lamp；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, make the curent change of LED light source be it is linear, the variation of the light emission luminance of LED light source is unconspicuous, therefore it will not influence illuminating effect, and LEDbulb lamp will not be made to overheat.
Description
Technical field
The present invention relates to a kind of LEDbulb lamps, more particularly, to a kind of LEDbulb lamp circuit of Linear temperature control protection.
Background technique
As most countries produce and sell the starting forbidden to conventional incandescent, incandescent lamp will be gradually backed out market,
LEDbulb lamp has started largely to enter market.It is small in size due to LEDbulb lamp, it but needs to accommodate LED light source, driving power
Deng therefore, on the one hand, LED light source compares concentration, and calorific value is big, and LED light source is easy to cause to overheat, and can not only make LED light source
Decay of luminescence, and will affect the service life of LED light source, to will affect the service life of LEDbulb lamp；On the other hand, driving power
It itself can also generate heat, driving power overheat also will affect its function and service life, to will affect the service life of LEDbulb lamp.
LED light source and driving power overheat in order to prevent, generally use temperature sensor, pass through the control of temperature sensor
It reduces the output electric current of driving power, reduces so that LED light source and driving power be made to generate heat to prevent LED light source and driving electricity
Source overheat.However, since the reduction of the output electric current of driving power can be such that the light emission luminance of LED light source reduces, so if control
Make it is bad, will lead to LEDbulb lamp shine generate light and shade contrast variation.
It is at any time that is, temperature varies slightly that the temperature sensor used in existing LEDbulb lamp, which varies with temperature, is driven
The output electric current of dynamic power supply will change therewith, therefore, can also go out in the case where not causing LED light source and driving power overheats
The variation of the light emission luminance of existing LED light source；In addition, some temperature sensors vary with temperature the electric current that can cause LEDbulb lamp
When mutating, for example reaching a certain temperature spot, the electric current of LEDbulb lamp becomes smaller suddenly, and the light emission luminance of LED light source is caused to produce
Raw mutation, to will affect the illuminating effect of LEDbulb lamp.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of LEDbulb lamp circuits of Linear temperature control protection, can
It is effectively prevented LED light source or driving power overheat, and it is unobvious that the light emission luminance of LED light source can be made to change, to make LED
The good illumination effect of bulb lamp.
The technical scheme of the invention to solve the technical problem is: a kind of LEDbulb lamp of Linear temperature control protection
Circuit, including LED drive circuit, the LED drive circuit are permanent by over-current over-voltage protection unit, rectification filtering unit, switch
Flow unit and output unit composition, the LED light source connection in the output unit and LEDbulb lamp；It is characterized by: should
LEDbulb lamp circuit further includes temperature protection circuit, the temperature protection circuit by negative tempperature coefficient thermistor, with reference to electricity
Resistance, temperature detection and control circuit composition, the negative tempperature coefficient thermistor is set on the LED light source, described
Negative tempperature coefficient thermistor connect with first input terminal of the temperature detection and control circuit, the described reference electricity
Resistance is connect with second input terminal of the temperature detection and control circuit, the output of the temperature detection and control circuit
End is connect with the switch constant current unit；The temperature of the LED light source is equal to or higher than the first operating temperature point of setting
When, the resistance value of the negative tempperature coefficient thermistor be decreased to it is suitable or smaller with the resistance value of the reference resistance,
The electric current of the output end of the temperature detection and control circuit output at this time makes the output unit supply the LED light
The electric current in source linearly reduces, and the power of the LED light source linearly reduces therewith, and the light emission luminance of the LED light source is with institute
The linear reduction of the electric current for the LED light source stated and linearly reduce, the temperature of the LED light source is fallen after rise.
The over-current over-voltage protection unit is made of fuse and varistor, and one end of the fuse is low with city
The firewire of frequency alternating current connects, and the other end of the fuse is connect with one end of the varistor, and its public company
End is connect to connect as the cathode output end of the over-current over-voltage protection unit and the electrode input end of the rectification filtering unit
It connects, the other end of the varistor is connect with the zero curve of city's low frequency ac, and its public connecting end is as the mistake
The cathode output end of stream Overvoltage protecting unit is connect with the negative input of the rectification filtering unit.
The rectification filtering unit by being formed as the first inductance of filter inductance, rectifier bridge stack and π type filter circuit,
The π type filter circuit is by the second inductance, third capacitor, the 4th capacitor, the 5th capacitor, the 5th resistance and the 6th resistance group
At, electrode input end of the one end of first inductance as the rectification filtering unit, first inductance it is another
One end is connect with the electrode input end of the rectifier bridge stack, and the negative input of the rectifier bridge stack is as the rectification
The negative input of filter unit, the cathode output end of the rectifier bridge stack respectively with one end of second inductance and institute
One end of the 4th capacitor stated connects, the other end of second inductance respectively with one end of the third capacitor and described
The 5th capacitor one end connection, and cathode output end of its public connecting end as the rectification filtering unit be described
The other end of third capacitor is connect with one end of one end of the 5th resistance and the 6th resistance respectively, and described is whole
Flow the cathode output end of bridge heap, the other end of the 4th capacitor, the other end of the 5th resistance, the 6th electricity
The other end of the other end of resistance and the 5th capacitor is grounded, and its public connecting end is as the rectification filtering unit
Cathode output end.
The switch constant current unit drives control by the LED drive control chip of model TC211, as the LED
The 3rd resistor of the start-up resistor of coremaking piece, the 7th capacitor of start-up capacitance as the LED drive control chip, conduct
The triode of the switching tube of the switch constant current unit, the second diode as isolating diode, zener diode and by
Tenth resistance, eleventh resistor, twelfth resistor, the current detection circuit composition of the 5th diode, the 6th diode composition, institute
Main winding of the output unit stated by transformer, the first diode as freewheeling diode, the first electricity as filter capacitor
Hold, first resistor and the 9th capacitor composition, the temperature detection and control circuit by model TC5001 temperature detection and
It controls chip, the 15th resistance and the 16th resistance composition, the output unit and is connected with power supply unit, the power supply list
Member is by providing the first power supply unit of power supply for the LED drive control chip and being the temperature measurement and control chip
The second power supply unit composition of power supply, one of auxiliary winding, second electricity of first power supply unit by transformer are provided
Resistance, the 4th resistance and the second capacitor composition, second power supply unit by transformer another auxiliary winding, as rectification two
The 4th diode, filter capacitor, the 7th resistance and the 9th resistance composition of pole pipe；
1st foot of the LED drive control chip is electric with one end of the 3rd resistor and the described the 7th respectively
One end of appearance connects, and the other end of the 3rd resistor is connect with the cathode output end of the rectification filtering unit, described
The other end of the 7th capacitor and the 2nd foot of the LED drive control chip be grounded, the LED drive control chip
The 3rd foot connect respectively with one end of the 6th foot of the temperature measurement and control chip and the tenth resistance, it is described
The other end of tenth resistance respectively with one end of the eleventh resistor, one end of the twelfth resistor, described
The connection of the cathode of the cathode of five diodes and the 6th diode, the other end of the eleventh resistor and described the
The other end of 12 resistance is grounded, and the cathode of the 4th foot of the LED drive control chip and second diode connects
It connects, the anode of second diode base stage, described with the cathode of the zener diode, the triode respectively
The second capacitor one end and the second resistance one end connection, the plus earth of the zener diode is described
The emitter of triode is connect with the anode of the anode of the 5th diode and the 6th diode respectively, described
The collector of triode respectively with described one end of the 9th capacitor, the anode of the first diode and the transformer
Main winding one end connection, the other end of the second resistance, the other end of the 9th capacitor, the described the 1st
One end of the cathode of pole pipe, the anode of the first capacitor and the first resistor is another with the 3rd resistor respectively
One end connection, and its public connecting end is connect with the electrode input end of the LED light source, the main winding of the transformer
The other end is connect with the other end of the cathode of the first capacitor and the first resistor respectively, and its public connecting end with
The negative input of the LED light source connects, and the other end of the main winding of the transformer passes through the 6th capacity earth, institute
The 5th foot and the 6th foot for the LED drive control chip stated are hanging, and the other end of second capacitor passes through the 4th electricity
Resistance connect with one end of one of auxiliary winding of the transformer, one of auxiliary winding of the transformer it is another
Hold the common end that is connect with one end of another auxiliary winding of the transformer respectively with one end of the 9th resistance and
The cathode of the filter capacitor connects, and its public connecting end is grounded, another auxiliary winding of the transformer it is another
It holds and is connect with the anode of the 4th diode, one end of the cathode of the 4th diode and the 7th resistance connects
It connects, anode of the other end of the 7th resistance respectively with the other end of the 9th resistance and the filter capacitor connects
It connects, and its public connecting end connects with one end of the negative tempperature coefficient thermistor and one end of the reference resistance respectively
Connect, the 1st foot of the temperature measurement and control chip respectively with the other end of the negative tempperature coefficient thermistor and institute
The one end for the 16th resistance stated connects, the 2nd foot, the 3rd foot and the connection of the 5th foot of the temperature measurement and control chip, and
Its public connecting end is connect with one end of the 15th resistance, the other end and the described the tenth of the 15th resistance
The other end of six resistance is grounded, the other end of the 4th foot and the reference resistance of the temperature measurement and control chip
Connection.
When the temperature of the LED light source is lower than the first operating temperature point set, the negative temperature coefficient thermistor power
The resistance value of resistance is much larger than the resistance value of the reference resistance；The temperature of the LED light source is equal to or higher than the of setting
When 1 operating temperature point, the resistance value of the negative tempperature coefficient thermistor is decreased to the resistance value with the reference resistance
It is suitable or smaller.
A kind of LEDbulb lamp circuit of Linear temperature control protection, including LED drive circuit, the LED drive circuit is by mistake
Flow Overvoltage protecting unit, rectification filtering unit, switch constant current unit and output unit composition, the output unit and LED ball
Steep the LED light source connection in lamp；It is characterized by: the LEDbulb lamp circuit further includes temperature protection circuit, the temperature is protected
Protection circuit is made of negative tempperature coefficient thermistor, reference resistance, temperature detection and control circuit, the negative temperature coefficient heat
Quick resistance is set to the electricity of the driving in the LEDbulb lamp being made of the LED drive circuit and the temperature protection circuit
On source, the negative tempperature coefficient thermistor is connect with first input terminal of the temperature detection and control circuit, institute
The reference resistance stated is connect with second input terminal of the temperature detection and control circuit, the temperature detection and control
The output end of circuit is connect with the switch constant current unit；The temperature of the driving power is equal to or higher than the second of setting
When operating temperature point, the resistance value of the negative tempperature coefficient thermistor is decreased to the resistance value phase with the reference resistance
When or it is smaller, the electric current of the output end output of described at this time temperature detection and control circuit makes the output unit supply institute
The electric current for the LED light source stated linearly reduces, and the power of the LED light source linearly reduces therewith, and the LED light source shines
Brightness linearly reduces with the linear reduction of the electric current of the LED light source, while the electric current of the driving power reduces, institute
The temperature for the driving power stated is fallen after rise.
When the temperature of the driving power is lower than the second operating temperature point set, the negative temperature coefficient thermistor power
The resistance value of resistance is much larger than the resistance value of the reference resistance；The temperature of the driving power is equal to or higher than the of setting
When 2 operating temperature points, the resistance value of the negative tempperature coefficient thermistor is decreased to the resistance value with the reference resistance
It is suitable or smaller.
Compared with the prior art, the advantages of the present invention are as follows:
The present invention uses negative tempperature coefficient thermistor and reference resistance, by the first operating temperature point of setting and sets
The second fixed operating temperature point, when the temperature of LED light source lower than setting the first operating temperature point when or driving power temperature
Lower than setting the second operating temperature point when, negative tempperature coefficient thermistor has no effect to LEDbulb lamp；Work as LED light source
Temperature be equal to or higher than setting the first operating temperature point when or driving power temperature be equal to or higher than setting the second work
When making temperature spot, the resistance change of negative tempperature coefficient thermistor, the electric current of the electric current or driving power that lead to LED light source is gradually
Few, the variation of the resistance value of negative tempperature coefficient thermistor and the variation of the electric current of LED light source or the electric current of driving power are lines
Property, close continuous, the variation of the light emission luminance of LED light source is unconspicuous, therefore circuit through the invention will not influence
Illuminating effect, while LEDbulb lamp will not be made to overheat, avoid light decay and shorten the service life of LEDbulb lamp.
Detailed description of the invention
Fig. 1 is the composition schematic diagram for the LEDbulb lamp circuit that Linear temperature control of the invention is protected；
Fig. 2 is the circuit diagram for the LEDbulb lamp circuit that Linear temperature control of the invention is protected；
Fig. 3 is the variation of the resistance value of negative tempperature coefficient thermistor and the linear change figure of analog output current；
3rd foot of LED drive control chip when Fig. 4 a exports for the output end no current of temperature detection and control circuit
Input current signal schematic diagram；
3rd foot of LED drive control chip when Fig. 4 b has electric current output for the output end of temperature detection and control circuit
Input current signal schematic diagram.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Embodiment one:
A kind of LEDbulb lamp circuit for Linear temperature control protection that the present embodiment proposes, as shown in Figure 1 comprising LED driving
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
It is formed with output unit 4, the input terminal of over-current over-voltage protection unit 1 accesses city's low frequency ac, over-current over-voltage protection unit 1
Output end is connect with the input terminal of rectification filtering unit 2, the output end of rectification filtering unit 2 and the first of switch constant current unit 3
A input terminal connection, the output end of switch constant current unit 3 are connect with the input terminal of output unit 4, and second of output unit 4 is defeated
Outlet is connect 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 raising resistance value of temperature), reference resistance Rref, temperature detection and control circuit 6 form, negative temperature coefficient heat
Quick resistance NTC is set on LED light source, and first output end of output unit 4 is connected with power supply unit 5, power supply unit 5 it is defeated
Outlet is connect with one end of one end of negative tempperature coefficient thermistor NTC and reference resistance Rref respectively, negative temperature coefficient heat-sensitive
The other end of resistance NTC is connect with first input terminal of temperature detection and control circuit 6, the other end of reference resistance Rref with
The output end and switch constant current list of the connection of second input terminal of temperature detection and control circuit 6, temperature detection and control circuit 6
Second input terminal connection of member 3；The temperature of negative tempperature coefficient thermistor NTC real-time measurement LED light source, the temperature of LED light source
When degree is lower 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, the output end no current output of temperature detection and control circuit 6；The temperature of LED light source is equal to or higher than setting
When 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 it is suitable or smaller, the output end of temperature detection and control circuit 6 exports electric current, temperature detection and control circuit at this time
Switching tube in the current-controlled switch constant current unit 3 of 6 output end output turns off or in advance, supplies output unit 4
The electric current of LED light source reduces, and the power of LED light source reduces therewith, the light emission luminance of LED light source with the electric current of LED light source line
Property reduce and linearly reduce, the temperature of LED light source is fallen after rise.Since 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 variation of the light emission luminance of LED light source be it is continuous, it is unconspicuous, therefore can
The heat for reducing LED light source falls the temperature of LED light source after rise, prevents LED light source from generating overheat.
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 more are installed on the LED lamp bead on metal circuit board with series, parallel or series-parallel system and form.
In the present embodiment, when the temperature of LED light source is lower than the first operating temperature point set, negative temperature coefficient thermistor power
The resistance value for hindering NTC is much larger than the resistance value of reference resistance Rref；The temperature of LED light source is equal to or higher than the first work of setting
When temperature spot, the resistance value of negative tempperature coefficient thermistor NTC is decreased to suitable or smaller with the resistance value of reference resistance Rref.
In the present embodiment, the first operating temperature point of setting can be according to the temperature for the service life for influencing LED light source
Point is set, and is such as set as 80 degrees Celsius.
In this particular embodiment, as shown in Fig. 2, over-current over-voltage protection unit 1 is by fuse F and varistor RV1 group
At one end of fuse F is connect with the firewire of city's low frequency ac, and the other end of fuse F and one end of varistor RV1 connect
It connects, and its public connecting end is as the cathode output end of over-current over-voltage protection unit 1 and the electrode input end of rectification filtering unit 2
Connection, the other end of varistor RV1 are connect with the zero curve of city's low frequency ac, and its public connecting end is protected as overcurrent-overvoltage
The cathode output end of shield unit 1 is connect with the negative input of rectification filtering unit 2.When overcurrent-overvoltage protection location 1 encounters electricity
When flowing through big, fuse F fuse protection back end device and circuit；Varistor RV1 be connected in parallel on the firewire of city's low frequency ac with
Between zero curve, voltage clamping is carried out when overcurrent-overvoltage protection location 1 bears over-voltage, absorbs extra energy with end-apparatus after protecting
Part and circuit.
In this particular embodiment, as shown in Fig. 2, rectification filtering unit 2 by city's low frequency ac be converted into without exchange at
The direct current divided, is made of the first inductance L1, rectifier bridge stack BR1 and π the type filter circuit as filter inductance, the filtering of π type
Circuit is made of the second inductance L2, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5, the 5th resistance R5 and the 6th resistance R6,
Electrode input end of the one end of first inductance L1 as rectification filtering unit 2, the other end and rectifier bridge stack BR1 of the first inductance L1
Electrode input end connection, negative input of the negative input of rectifier bridge stack BR1 as rectification filtering unit 2, rectifier bridge
The cathode output end of heap BR1 is connect with one end of one end of the second inductance L2 and the 4th capacitor C4 respectively, and the second inductance L2's is another
One end is connect with one end of one end of third capacitor C3 and the 5th capacitor C5 respectively, and its public connecting end is as rectifying and wave-filtering list
The cathode output end of member 2, the other end of third capacitor C3 connect with one end of the 5th resistance R5 and one end of the 6th resistance R6 respectively
It connects, the cathode output end of rectifier bridge stack BR1, the other end of the 4th capacitor C4, the other end of the 5th resistance R5, the 6th resistance R6
The other end of the other end and the 5th capacitor C5 are grounded, and cathode output end of its public connecting end as rectification filtering unit 2.
In this particular embodiment, as shown in Fig. 2, switching constant current unit 3 by the LED drive control core of model TC211
Piece IC1 (upper Heiden core microelectronics Science and Technology Ltd. production), as the 3rd resistor R3 of starting LED drive control chip IC 1
With the 7th capacitor C7, as switch constant current unit 3 switching tube triode Q1, as the second diode of isolating diode
D2, zener diode ZD1 and by the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, the 5th diode D5, the 6th
The composition such as current detection circuit of diode D6 composition, output unit 4 by the main winding of transformer TF1, as freewheeling diode
First diode D1, as filter capacitor first capacitor C1, first resistor R1 and the 9th capacitor C9 form, temperature detection and
Control circuit 6 by model TC5001 temperature measurement and control chip U1, the 15th resistance R15 and the 16th resistance R16 group
At power supply unit 5 is by providing the first power supply unit of power supply for LED drive control chip IC 1 and being temperature measurement and control core
Piece U1 provides the second power supply unit composition of power supply, one of auxiliary winding, second electricity of first power supply unit by transformer TF1
Hinder R2, the 4th resistance R4 and the second capacitor C2 composition, the second power supply unit by another auxiliary winding of transformer TF1, as whole
Flow the 4th diode D4, filter capacitor CD1, the 7th resistance R7 and the 9th resistance R9 composition of diode；LED drive control chip
The 1st foot of IC1 is connect with one end of one end of 3rd resistor R3 and the 7th capacitor C7 respectively, the other end of 3rd resistor R3 with it is whole
The cathode output end connection of filter unit 2 is flowed, the other end of the 7th capacitor C7 and the 2nd foot of LED drive control chip IC 1 connect
Ground, the 3rd foot of LED drive control chip IC 1 respectively with the 6th foot of temperature measurement and control chip U1 and the tenth resistance R10
One end connection, the other end of the tenth resistance R10 respectively with one end of eleventh resistor R11, one end of twelfth resistor R12, the
The cathode connection of the cathode and the 6th diode D6 of five diode D5, the other end and twelfth resistor R12 of eleventh resistor R11
The other end be grounded, the 4th foot of LED drive control chip IC 1 is connect with the cathode of the second diode D2, the second diode D2
Anode respectively with the cathode of zener diode ZD1, the base stage of triode Q1, one end of the second capacitor C2 and second resistance R2
One end connection, the plus earth of zener diode ZD1, the emitter of triode Q1 respectively with the anode of the 5th diode D5 and the
Six diode D6 anode connection, the collector of triode Q1 respectively with one end of the 9th capacitor C9, first diode D1 just
One end of the main winding of pole and transformer TF1 connects, the other end of second resistance R2, the other end of the 9th capacitor C9, the one or two
One end of the cathode of pole pipe D1, the anode of first capacitor C1 and first resistor R1 is connect with the other end of 3rd resistor R3 respectively,
And the electrode input end of its public connecting end and LED light source connects, the other end of the main winding of transformer TF1 is electric with first respectively
The cathode for holding C1 is connected with the other end of first resistor R1, and the negative input of its public connecting end and LED light source connects, and is become
The other end of the main winding of depressor TF1 is grounded by the 6th capacitor C6, and the 5th foot and the 6th foot of LED drive control chip IC 1 are outstanding
The other end of sky, the second capacitor C2 is connect by the 4th resistance R4 with one end of one of auxiliary winding of transformer TF1, transformation
The common end difference that the other end of one of auxiliary winding of device TF1 is connect with one end of another auxiliary winding of transformer TF1
It is connect with the cathode of one end of the 9th resistance R9 and filter capacitor CD1, and its public connecting end is grounded, transformer TF1's is another
The other end of a auxiliary winding is connect with the anode of the 4th diode D4, the cathode of the 4th diode D4 and one end of the 7th resistance R7
Connection, the other end of the 7th resistance R7 is connect with the anode of the other end of the 9th resistance R9 and filter capacitor CD1 respectively, and it is public
Altogether connecting pin connect respectively with one end of one end of negative tempperature coefficient thermistor NTC and reference resistance Rref, temperature detection with
The 1st foot for controlling chip U1 connects with one end of the other end of negative tempperature coefficient thermistor NTC and the 16th resistance R16 respectively
It connects, the 2nd foot, the 3rd foot and the connection of the 5th foot of temperature measurement and control chip U1, and its public connecting end and the 15th resistance R15
One end connection, the other end of the 15th resistance R15 and the other end of the 16th resistance R16 be grounded, temperature measurement and control
The 4th foot of chip U1 is connect with the other end of reference resistance Rref.
Embodiment two:
The Linear temperature control that the LEDbulb lamp circuit and embodiment one for a kind of Linear temperature control protection that the present embodiment proposes provide
The LEDbulb lamp circuit of protection the difference is that, negative tempperature coefficient thermistor NTC is set to LED ball by the present embodiment
It steeps in the driving power in lamp.As shown in Figure 1, the LEDbulb lamp circuit that the Linear temperature control of the present embodiment is protected includes LED driving
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
It is formed with output unit 4, the input terminal of over-current over-voltage protection unit 1 accesses city's low frequency ac, over-current over-voltage protection unit 1
Output end is connect with the input terminal of rectification filtering unit 2, the output end of rectification filtering unit 2 and the first of switch constant current unit 3
A input terminal connection, the output end of switch constant current unit 3 are connect with the input terminal of output unit 4, and second of output unit 4 is defeated
Outlet is connect 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 raising resistance value of temperature), reference resistance Rref, temperature detection and control circuit 6 form, negative temperature coefficient heat
Quick resistance NTC is set in the driving power in the LEDbulb lamp being made of LED drive circuit and temperature protection circuit, output
First output end of unit 4 is connected with power supply unit 5, the output end of power supply unit 5 respectively with negative tempperature coefficient thermistor
One end of NTC is connected with one end of reference resistance Rref, the other end of negative tempperature coefficient thermistor NTC and temperature detection and control
First input terminal of circuit 6 processed connects, and second of the other end of reference resistance Rref and temperature detection and control circuit 6 is defeated
Enter end to connect, the output end of temperature detection and control circuit 6 is connect with second input terminal of switch constant current unit 3；Negative temperature
The temperature of coefficient resistance NTC real-time measurement driving power, the temperature of driving power is lower than the second operating temperature point set
When, the resistance value of negative tempperature coefficient thermistor NTC is much larger than the resistance value of reference resistance Rref, temperature detection and control circuit
6 output end no current output；When the temperature of driving power is equal to or higher than the second operating temperature point of setting, negative temperature coefficient
The resistance value of thermistor NTC linearly reduces, and is decreased to, at this time temperature suitable or smaller with the resistance value of reference resistance Rref
The output end of detection and control circuit 6 exports electric current, the current-controlled switch of the output end output of temperature detection and control circuit 6
Switching tube in constant current unit 3 turns off or in advance, and the electric current for making output unit 4 supply LED light source reduces, the LED
The power of light source reduces therewith, the light emission luminance of the LED light source line with the linear reduction of the electric current of the LED light source
Property reduce, while the electric current of driving power reduces, and the temperature of driving power is fallen after rise.Due to negative tempperature coefficient thermistor NTC's
Resistance change can lead to the linear change of the electric current of LED light source so that the variation of the light emission luminance of LED light source be it is continuous,
It is unconspicuous, while reduce the electric current of driving power, heat reduction falls the temperature of driving power after rise, prevents driving power mistake
Heat.
In the present embodiment, driving power uses non-isolated power supply or isolated power supply.
In the present embodiment, when the temperature of driving power is lower than the second operating temperature point set, negative temperature coefficient heat-sensitive
The resistance value of resistance NTC is much larger than the resistance value of reference resistance Rref；The temperature of driving power is equal to or higher than the second of setting
When operating temperature point, the resistance value of negative tempperature coefficient thermistor NTC be decreased to the resistance value of reference resistance Rref quite or
It is smaller.
In the present embodiment, the second operating temperature point of setting by can according to influence driving light source service life temperature
Degree point is set, and is such as set as 60 degrees Celsius.
In the present embodiment, the specific electricity for the LEDbulb lamp circuit that physical circuit and the Linear temperature control of embodiment one are protected
Road is identical.
The LEDbulb lamp circuit of Linear temperature control protection of the invention, when first of the temperature of LED light source lower than setting works
When temperature spot or when the temperature of driving power is lower than the second operating temperature point set, the electricity of negative tempperature coefficient thermistor NTC
Resistance value is much larger than the resistance value of reference resistance Rref, the output end no current output of temperature detection and control circuit 6, LED driving
The 3rd foot of chip IC 1 is controlled by current detection circuit input current, electric current is gradually increased from zero to generation reference voltage
Vref, the 4th foot of LED drive control chip IC 1 exports a voltage signal control as the triode Q1's of switching tube at this time
It turns off or on；When the temperature of LED light source is equal to or higher than the first operating temperature point of setting or the temperature of driving power etc.
In or higher than setting the second operating temperature point when, the resistance value of negative tempperature coefficient thermistor NTC linearly reduces, and is decreased to
It is suitable or smaller with the resistance value of reference resistance Rref, the electric current Iout of the output end of temperature detection and control circuit 6 output with
The electric current superposition of current detection circuit input, inputs the 3rd foot of LED drive control chip IC 1, due to temperature detection and control together
The extracurrent that circuit 6 processed provides, therefore the voltage superposition at the 3rd foot of LED drive control chip IC 1, rapidly increase to base
Quasi- voltage Vref, the voltage for causing the 4th foot of LED drive control chip IC 1 to export reaches threshold value in advance to be made as switching tube
Triode Q1 is closed in advance, makes to export in output unit 4 in this way to the electric current reduction of LED light source, the power of LED light source subtracts therewith
Small, the temperature of LED light source or driving power is fallen after rise, and such LED light source or driving power keep constant temperature work, LED ball bubble
Lamp keeps steady operation, reduces light decay, and extend the service life of LEDbulb lamp.
Fig. 3 gives the variation of the resistance value of negative tempperature coefficient thermistor and the linear change figure of analog output current,
When the resistance value of negative tempperature coefficient thermistor NTC is sufficiently large (such as larger than 1000 ohm), temperature detection and control circuit 6
Output end does not have electric current output；(such as less than 1000 when the resistance value of negative tempperature coefficient thermistor NTC reducing to certain value
Ohm), the electric current of the output end output of temperature detection and control circuit 6 is greater than zero；With negative tempperature coefficient thermistor NTC's
There is class and linearly increases in the electric current of the output end output of the reduction of resistance value, temperature detection and control circuit 6, and it is permanent to input to switch
Unit 3 is flowed, output unit 4 is controlled, makes to export and class occurs to the electric current of LED light source and linearly reduce, the power class of LED light source is linear
It reduces, the power reduction of LED light source reduces the fever of LED light source, while the brightness of LED light source will not be made to reduce suddenly, reaches
To the accurate fever and brightness for adjusting LED light source.
The 3rd of LED drive control chip when Fig. 4 a gives the output end no current output of temperature detection and control circuit
The input current signal schematic diagram of foot, LED drives when the output end that Fig. 4 b gives temperature detection and control circuit has electric current output
The input current signal schematic diagram of 3rd foot of dynamic control chip.In Fig. 4 a and Fig. 4 b, Vcs indicates LED drive control chip IC 1
The 3rd foot at voltage, VrefIndicate that LED drive control chip IC 1 controls the threshold voltage that triode Q1 is closed, at this time LED light
The electric current in source is Iled=1/2Vref, IoutIndicate the electric current of the output end output of temperature detection and control circuit 6, (Iout*Rtemp)
Electric current for the output of the output end of temperature detection and control circuit 6 flows through the tenth resistance R10, eleventh resistor R11 and the 12nd
The pressure drop formed when resistance R12, RtempFor the resistance value of the tenth resistance R10, eleventh resistor R11 and twelfth resistor R12
And value, the electric current of LED light source is I at this timeled≈1/2(Vref–Iout*Rtemp), current capacity linearly reduces, the power drop of LED light source
Low, the fever of LED light source is reduced.When the resistance value of negative tempperature coefficient thermistor NTC increases, lead to temperature detection and control
The electric current of the output end output of circuit 6 is decreased to zero, and the electric current of LED light source increases, and returns to initial state.
Claims (6)
1. a kind of LEDbulb lamp circuit of Linear temperature control protection, including LED drive circuit, the LED drive circuit is by overcurrent
Overvoltage protecting unit, rectification filtering unit, switch constant current unit and output unit composition, the output unit and LED ball are steeped
LED light source connection in lamp；It is characterized by: the LEDbulb lamp circuit further includes temperature protection circuit, the temperature protection
Circuit is made of negative tempperature coefficient thermistor, reference resistance, temperature detection and control circuit, the negative temperature coefficient heat-sensitive
Resistance is set on the LED light source, the negative tempperature coefficient thermistor and the temperature detection and control circuit
The connection of first input terminal, second input terminal of the reference resistance and the temperature detection and control circuit connect
It connects, the output end of the temperature detection and control circuit is connect with the switch constant current unit；The temperature of the LED light source
When degree is equal to or higher than the first operating temperature point of setting, the resistance value of the negative tempperature coefficient thermistor is decreased to and institute
The resistance value for the reference resistance stated is suitable or smaller, and the output end of the temperature detection and control circuit exports electric current at this time,
Switching tube in switch constant current unit described in the current control of the output end output of the temperature detection and control circuit mentions
Before turn off or on, the electric current for making the output unit supply the LED light source linearly reduces, the LED light source
Power linearly reduces therewith, and the light emission luminance of the LED light source is linear with the linear reduction of the electric current of the LED light source
Reduce, the temperature of the LED light source is fallen after rise；
The switch constant current unit by the LED drive control chip of model TC211, as the LED drive control core
The 3rd resistor of the start-up resistor of piece, as the LED drive control chip start-up capacitance the 7th capacitor, as described
The triode of switching tube of switch constant current unit, the second diode as isolating diode, zener diode and by the tenth
Resistance, eleventh resistor, twelfth resistor, the current detection circuit composition of the 5th diode, the 6th diode composition, it is described
Main winding of the output unit by transformer, the first diode as freewheeling diode, as filter capacitor first capacitor,
One resistance and the 9th capacitor composition, the temperature detection and control circuit by model TC5001 temperature measurement and control core
Piece, the 15th resistance and the 16th resistance composition, the output unit are connected with power supply unit, the power supply unit by for
The LED drive control chip provides the first power supply unit of power supply and provides electricity for the temperature measurement and control chip
Second power supply unit in source forms, one of auxiliary winding of first power supply unit by transformer, second resistance, the 4th
Resistance and the second capacitor composition, second power supply unit by another auxiliary winding of transformer, as rectifier diode
4th diode, filter capacitor, the 7th resistance and the 9th resistance composition；
1st foot of the LED drive control chip respectively with one end of the 3rd resistor and the 7th capacitor
One end connection, the other end of the 3rd resistor connect with the cathode output end of the rectification filtering unit, and described the
2nd foot of the other end of seven capacitors and the LED drive control chip is grounded, and the 3rd of the LED drive control chip the
Foot is connect with one end of the 6th foot of the temperature measurement and control chip and the tenth resistance respectively, and the described the tenth
The other end of resistance respectively with one end of the eleventh resistor, one end of the twelfth resistor, the described the 5th 2
The connection of the cathode of the cathode of pole pipe and the 6th diode, the other end of the eleventh resistor and the described the 12nd
The other end of resistance is grounded, and the 4th foot of the LED drive control chip is connect with the cathode of second diode,
The anode of second diode base stage, described with the cathode of the zener diode, the triode respectively
One end of second capacitor and the connection of one end of the second resistance, the plus earth of the zener diode, described three
The emitter of pole pipe is connect with the anode of the anode of the 5th diode and the 6th diode respectively, and described three
The collector of pole pipe respectively with described one end of the 9th capacitor, the anode of the first diode and the transformer
One end of main winding connects, the other end of the second resistance, the other end of the 9th capacitor, the one or two pole
One end of the cathode of pipe, the anode of the first capacitor and the first resistor is another with the 3rd resistor respectively
End connection, and its public connecting end is connect with the electrode input end of the LED light source, the main winding of the transformer it is another
One end is connect with the other end of the cathode of the first capacitor and the first resistor respectively, and its public connecting end and institute
The negative input for the LED light source stated connects, and the other end of the main winding of the transformer is described by the 6th capacity earth
LED drive control chip the 5th foot and the 6th foot it is hanging, the other end of second capacitor passes through the 4th resistance
It is connect with one end of one of auxiliary winding of the transformer, the other end of one of auxiliary winding of the transformer
The common end being connect with one end of another auxiliary winding of the transformer respectively with one end of the 9th resistance and institute
The cathode for the filter capacitor stated connects, and its public connecting end is grounded, the other end of another auxiliary winding of the transformer
It is connect with the anode of the 4th diode, one end of the cathode of the 4th diode and the 7th resistance connects
It connects, anode of the other end of the 7th resistance respectively with the other end of the 9th resistance and the filter capacitor connects
It connects, and its public connecting end connects with one end of the negative tempperature coefficient thermistor and one end of the reference resistance respectively
Connect, the 1st foot of the temperature measurement and control chip respectively with the other end of the negative tempperature coefficient thermistor and institute
The one end for the 16th resistance stated connects, the 2nd foot, the 3rd foot and the connection of the 5th foot of the temperature measurement and control chip, and
Its public connecting end is connect with one end of the 15th resistance, the other end and the described the tenth of the 15th resistance
The other end of six resistance is grounded, the other end of the 4th foot and the reference resistance of the temperature measurement and control chip
Connection.
2. a kind of LEDbulb lamp circuit of Linear temperature control protection according to claim 1, it is characterised in that the overcurrent
Overvoltage protecting unit is made of fuse and varistor, and one end of the fuse and the firewire of city's low frequency ac connect
It connects, the other end of the fuse is connect with one end of the varistor, and its public connecting end is as the mistake
The cathode output end of stream Overvoltage protecting unit is connect with the electrode input end of the rectification filtering unit, the varistor
The other end connect with the zero curve of city's low frequency ac, and its public connecting end is as the negative of the over-current over-voltage protection unit
Pole output end is connect with the negative input of the rectification filtering unit.
3. a kind of LEDbulb lamp circuit of Linear temperature control protection according to claim 1, it is characterised in that the rectification
Filter unit as the first inductance of filter inductance, rectifier bridge stack and π type filter circuit by forming, the π type filter circuit
It is made of the second inductance, third capacitor, the 4th capacitor, the 5th capacitor, the 5th resistance and the 6th resistance, first inductance
Electrode input end of the one end as the rectification filtering unit, the other end of first inductance and the rectifier bridge stack
Electrode input end connection, the negative input of the rectifier bridge stack inputs as the cathode of the rectification filtering unit
End, the cathode output end of rectifier bridge stack one end with one end of second inductance and the 4th capacitor respectively
Connection, the other end of second inductance connect with one end of the third capacitor and one end of the 5th capacitor respectively
It connects, and cathode output end of its public connecting end as the rectification filtering unit, the other end point of the third capacitor
It is not connect with one end of one end of the 5th resistance and the 6th resistance, the cathode output of the rectifier bridge stack
End, the other end of the other end of the 4th capacitor, the other end of the 5th resistance, the 6th resistance and described
The other end of the 5th capacitor be grounded, and cathode output end of its public connecting end as the rectification filtering unit.
4. a kind of LEDbulb lamp circuit of Linear temperature control protection according to claim 1, it is characterised in that the LED
When the temperature of light source is lower than the first operating temperature point set, the resistance value of the negative tempperature coefficient thermistor is much larger than institute
The resistance value for the reference resistance stated；It is described when the temperature of the LED light source is equal to or higher than the first operating temperature point of setting
Negative tempperature coefficient thermistor resistance value be decreased to it is suitable or smaller with the resistance value of the reference resistance.
5. a kind of LEDbulb lamp circuit of Linear temperature control protection, including LED drive circuit, the LED drive circuit is by overcurrent
Overvoltage protecting unit, rectification filtering unit, switch constant current unit and output unit composition, the output unit and LED ball are steeped
LED light source connection in lamp；It is characterized by: the LEDbulb lamp circuit further includes temperature protection circuit, the temperature protection
Circuit is made of negative tempperature coefficient thermistor, reference resistance, temperature detection and control circuit, the negative temperature coefficient heat-sensitive
Resistance is set to the driving power in the LEDbulb lamp being made of the LED drive circuit and the temperature protection circuit
On, the negative tempperature coefficient thermistor is connect with first input terminal of the temperature detection and control circuit, described
Reference resistance connect with second input terminal of the temperature detection and control circuit, the temperature detection and control electricity
The output end on road is connect with the switch constant current unit；The temperature of the driving power is equal to or higher than the second work of setting
When making temperature spot, the resistance value of the negative tempperature coefficient thermistor is decreased to suitable with the resistance value of the reference resistance
Or it is smaller, the output end of the temperature detection and control circuit exports electric current, the temperature detection and control circuit at this time
Output end output current control described in switching tube in switch constant current unit turn off or in advance, make the output
The electric current of the unit supply LED light source linearly reduces, and the power of the LED light source linearly reduces therewith, the LED
The light emission luminance of light source linearly reduces with the linear reduction of the electric current of the LED light source, while the driving power
Electric current reduces, and the temperature of the driving power is fallen after rise；
The switch constant current unit by the LED drive control chip of model TC211, as the LED drive control core
The 3rd resistor of the start-up resistor of piece, as the LED drive control chip start-up capacitance the 7th capacitor, as described
The triode of switching tube of switch constant current unit, the second diode as isolating diode, zener diode and by the tenth
Resistance, eleventh resistor, twelfth resistor, the current detection circuit composition of the 5th diode, the 6th diode composition, it is described
Main winding of the output unit by transformer, the first diode as freewheeling diode, as filter capacitor first capacitor,
One resistance and the 9th capacitor composition, the temperature detection and control circuit by model TC5001 temperature measurement and control core
Piece, the 15th resistance and the 16th resistance composition, the output unit are connected with power supply unit, the power supply unit by for
The LED drive control chip provides the first power supply unit of power supply and provides electricity for the temperature measurement and control chip
Second power supply unit in source forms, one of auxiliary winding of first power supply unit by transformer, second resistance, the 4th
Resistance and the second capacitor composition, second power supply unit by another auxiliary winding of transformer, as rectifier diode
4th diode, filter capacitor, the 7th resistance and the 9th resistance composition；
1st foot of the LED drive control chip respectively with one end of the 3rd resistor and the 7th capacitor
One end connection, the other end of the 3rd resistor connect with the cathode output end of the rectification filtering unit, and described the
2nd foot of the other end of seven capacitors and the LED drive control chip is grounded, and the 3rd of the LED drive control chip the
Foot is connect with one end of the 6th foot of the temperature measurement and control chip and the tenth resistance respectively, and the described the tenth
The other end of resistance respectively with one end of the eleventh resistor, one end of the twelfth resistor, the described the 5th 2
The connection of the cathode of the cathode of pole pipe and the 6th diode, the other end of the eleventh resistor and the described the 12nd
The other end of resistance is grounded, and the 4th foot of the LED drive control chip is connect with the cathode of second diode,
The anode of second diode base stage, described with the cathode of the zener diode, the triode respectively
One end of second capacitor and the connection of one end of the second resistance, the plus earth of the zener diode, described three
The emitter of pole pipe is connect with the anode of the anode of the 5th diode and the 6th diode respectively, and described three
The collector of pole pipe respectively with described one end of the 9th capacitor, the anode of the first diode and the transformer
One end of main winding connects, the other end of the second resistance, the other end of the 9th capacitor, the one or two pole
One end of the cathode of pipe, the anode of the first capacitor and the first resistor is another with the 3rd resistor respectively
End connection, and its public connecting end is connect with the electrode input end of the LED light source, the main winding of the transformer it is another
One end is connect with the other end of the cathode of the first capacitor and the first resistor respectively, and its public connecting end and institute
The negative input for the LED light source stated connects, and the other end of the main winding of the transformer is described by the 6th capacity earth
LED drive control chip the 5th foot and the 6th foot it is hanging, the other end of second capacitor passes through the 4th resistance
It is connect with one end of one of auxiliary winding of the transformer, the other end of one of auxiliary winding of the transformer
The common end being connect with one end of another auxiliary winding of the transformer respectively with one end of the 9th resistance and institute
The cathode for the filter capacitor stated connects, and its public connecting end is grounded, the other end of another auxiliary winding of the transformer
It is connect with the anode of the 4th diode, one end of the cathode of the 4th diode and the 7th resistance connects
It connects, anode of the other end of the 7th resistance respectively with the other end of the 9th resistance and the filter capacitor connects
It connects, and its public connecting end connects with one end of the negative tempperature coefficient thermistor and one end of the reference resistance respectively
Connect, the 1st foot of the temperature measurement and control chip respectively with the other end of the negative tempperature coefficient thermistor and institute
The one end for the 16th resistance stated connects, the 2nd foot, the 3rd foot and the connection of the 5th foot of the temperature measurement and control chip, and
Its public connecting end is connect with one end of the 15th resistance, the other end and the described the tenth of the 15th resistance
The other end of six resistance is grounded, the other end of the 4th foot and the reference resistance of the temperature measurement and control chip
Connection.
6. a kind of LEDbulb lamp circuit of Linear temperature control protection according to claim 5, it is characterised in that the driving
When the temperature of power supply is lower than the second operating temperature point set, the resistance value of the negative tempperature coefficient thermistor is much larger than institute
The resistance value for the reference resistance stated；When the temperature of the driving power is equal to or higher than the second operating temperature point of setting, institute
The resistance value for the negative tempperature coefficient thermistor stated is decreased to suitable or smaller with the resistance value of the reference resistance.
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| CN107013823A (en) * | 2017-05-05 | 2017-08-04 | 浙江阳光美加照明有限公司 | A kind of temperature-control LED filament and the LEDbulb lamp using the temperature-control LED filament |
| CN108575014A (en) * | 2017-08-10 | 2018-09-25 | 常州星宇车灯股份有限公司 | It is increased with temperature with thermistor PTC and promotes electric current to stable circuit |
| CN107785877A (en) * | 2017-12-08 | 2018-03-09 | 厦门芯阳科技股份有限公司 | A kind of low cost has current limliting and limits the sampling protection circuit of temperature function |
| CN108037782A (en) * | 2017-12-30 | 2018-05-15 | 唐志雄 | A kind of operating temperature control method and device of green laser projecting lamp |
| 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 |
| JP7117184B2 (en) * | 2018-07-19 | 2022-08-12 | 株式会社小糸製作所 | Lighting circuit and vehicle lamp |
| 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 |
| CN215073069U (en) * | 2019-12-16 | 2021-12-07 | 嘉兴山蒲照明电器有限公司 | Temperature sampling device, temperature protection device and lighting system |
| CN112013986B (en) * | 2020-09-03 | 2021-08-13 | 珠海迈巨微电子有限责任公司 | Temperature detection circuit, temperature detection method and battery protection method |
| CN112235895B (en) * | 2020-09-10 | 2023-06-02 | 深圳市崧盛电子股份有限公司 | Over-temperature protection circuit and driving power supply |
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| CN201294659Y (en) * | 2008-10-07 | 2009-08-19 | 矽恩微电子(厦门)有限公司 | High-power LED driven circuit for compensating universal temperature |
| US9913338B2 (en) * | 2010-07-28 | 2018-03-06 | Epistar Corporation | Light-emitting device with temperature compensation |
| CN105333322B (en) * | 2015-12-08 | 2018-09-28 | 浙江阳光美加照明有限公司 | A kind of high-power LED mine lamp |
| CN205793538U (en) * | 2016-06-22 | 2016-12-07 | 浙江阳光美加照明有限公司 | A kind of LEDbulb lamp circuit of Linear temperature control protection |
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