CN205883648U - LED both ends constant current drive chip - Google Patents
LED both ends constant current drive chip Download PDFInfo
- Publication number
- CN205883648U CN205883648U CN201620788615.XU CN201620788615U CN205883648U CN 205883648 U CN205883648 U CN 205883648U CN 201620788615 U CN201620788615 U CN 201620788615U CN 205883648 U CN205883648 U CN 205883648U
- Authority
- CN
- China
- Prior art keywords
- module
- led
- temperature
- voltage
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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 utility model provides a LED both ends constant current drive chip, including the power tube, obtain the current sample module of current signal, a voltage stabilizing power supply module of mains voltage is provided, produce reference voltage's reference voltage module, carry out the operational amplifier module of comparison with control output current to current sample voltage and reference voltage, and be higher than as ambient temperature and carry out the temperature compensating module protected when setting for the temperature. Comparison through reference voltage and current sample voltage realizes the constant current control, and simultaneously, real -time detection ambient temperature is greater than when setting for the temperature as ambient temperature, the electric current realization temperature compensating of the power tube that reduces to flow through. The utility model discloses an electrical power generating system simple structure need not peripheral device and just can realize outstanding constant current characteristic, has operating voltage and hangs down, and the operating current is little, advantages such as the consumption is few, small, with low costs, temperature characteristic is good, do you simultaneously, be applicable to TO 252 multi -chip package perhaps is as both ends device and LED chip together to encapsulation, COB encapsulation.
Description
Technical field
This utility model relates to LED constant current and drives field, particularly relates to a kind of LED two ends constant-current driven chip.
Background technology
LED is a kind of semiconductor electronic component that can be luminous, and this electronic component can only send the HONGGUANG of low luminosity in early days,
Along with the continuous progress of technology, having evolved to now to send the degree of visible ray, infrared ray and ultraviolet, luminosity there has also been very
Big raising.LED has too late excellent of the conventional light source such as efficiency is high, life-span length, not cracky, switching speed height, high reliability
Point, has been widely used in display lamp, display and lighting field.
Due to the one-way conduction characteristic of LED, when LED two ends add backward voltage, LED is in reverse dead band, Bu Nengfa
Light；When backward voltage is excessive, LED is in reverse breakdown district, and LED damaged can even be burnt, scrapped；Slow at LED two ends
When adding forward voltage slowly, when voltage is the least, LED can't ON operation；When the additional forward voltage forward drive electricity more than LED
During pressure VF, LED begins to turn on, and electric current increases linear increase with voltage；Continue to increase additional forward voltage, curent change now
The most violent；When additional forward voltage reaches positive drive voltage VF of LED, the using effect of LED is optimal, so needing logical
Cross a constant-current control circuit to make LED diode operation at steady-state, it is ensured that the maximally effective work of LED.
For the ease of using, existing constant current driver circuit for LED is typically integrated in chip, by with peripheral electric capacity, electricity
The cooperation of the devices such as resistance realizes current constant control.As it is shown in figure 1, current constant control chip realizes adopting by resistance Rup, Rdn and Rcs
Sample, carries out energy storage by electric capacity C.COB encapsulation i.e. chip On board, it is simply that bare chip conduction or non-conductive adhesive are adhered to
On interconnection substrates, then carrying out wire bonding and realize its electrical connection, COB packaging technology comparative maturity, is in prior art
A kind of more conventional and lower-cost encapsulation technology of ratio, puts into the most, the widest on existing production line.Existing LED is permanent
Flow control chip is it is generally required to multiple external connection end is connected with peripheral components, and the volume of these peripheral components is relatively big, even
Connecing relation the most more complicated, be not suitable for COB encapsulation and multi-chip package, therefore, the packaging technology of current constant control chip receives
Certain restriction, it is impossible to large-scale production on existing COB packaging line, causes the waste of resource.
Therefore, how to optimize multiport LED constant current control chip of the prior art, simplify peripheral components, be suitable to COB envelope
Dress and multi-chip package, reduce production cost, improves product competitiveness and has become those skilled in the art's problem demanding prompt solution
One of.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of LED two ends constant current to drive
Dynamic chip, is used for solving LED constant current control chip peripheral components volume in prior art big, and annexation is complicated, is unsuitable for COB
The problems such as encapsulation and multi-chip package.
For achieving the above object and other relevant purposes, this utility model provides a kind of LED two ends constant-current driven chip, institute
State LED two ends constant-current driven chip at least to include:
Power tube, current sample module, power module of voltage regulation, reference voltage module, amplifier module and temperature-compensating mould
Block；
The drain terminal of described power tube connects external LED lamp string as the first external-connected port, and grid end connects described amplifier module
Outfan, flowed through the electric current of external LED lamp string by the self-adaptative adjustment of described amplifier module, and then realize current constant control；
One end of described current sample module connects the source of described power tube, and the other end is connect by the second external-connected port
Ground, the electric current flowing through described power tube is sampled, and is converted into current sample voltage by described current sample module；
Described power module of voltage regulation is connected to described first external-connected port, obtains electric energy from described first external-connected port and produces
The supply voltage of raw described LED two ends constant-current driven chip；
Described reference voltage module is connected to described power module of voltage regulation, is used for producing reference voltage；
The input of described amplifier module connects described current sample module and described reference voltage module, outfan respectively
Connecting the grid end of described power tube, the voltage of two inputs realizing described amplifier module by self-adaptative adjustment is equal；
Described temperature compensation module is connected between described current sample module and described amplifier module, or is connected to described
The input of reference voltage module, obtains by the temperature of described LED two ends constant-current driven chip local environment is carried out detection
Compensate voltage, and described compensation voltage-drop loading to described sampling is pressed or on described reference voltage, flow through external LED to adjust
The electric current of lamp string.
Preferably, described temperature compensation module includes: the first temperature detecting unit, voltage compensation unit；
The temperature of described LED two ends constant-current driven chip local environment is detected by described first temperature detecting unit,
And produce temperature variation；
Described temperature variation is converted into corresponding voltage signal by described voltage compensation unit, obtains described compensation electricity
Pressure.
It is highly preferred that described first temperature detecting unit is by the temperature of described LED two ends constant-current driven chip local environment
Compare to obtain temperature variation with the junction temperature of temperature detection device.
It is highly preferred that described temperature detection device includes thermal diode, critesistor, temperature-sensitive audion.
Preferably, described LED two ends constant-current driven chip also includes: be connected to the high temperature protection mould of described power tube grid end
Block, described high temperature protection module includes the second temperature detecting unit and lower trombone slide；
The temperature of described LED two ends constant-current driven chip local environment is detected by described second temperature detecting unit,
When the temperature of described LED two ends constant-current driven chip local environment affects the normal operating conditions of each semiconductor device, output
One protection signal；
Described lower trombone slide is connected to the outfan of described second temperature detecting unit, when described protection signal onset by institute
The grid terminal voltage stating power tube drags down, and then turns off described power tube.
It is highly preferred that described lower trombone slide is nmos device, the grid end of described lower trombone slide connects described second temperature detection list
Unit, drain terminal connect the grid end of described power tube, source ground connection.
Preferably, described LED two ends constant-current driven chip also includes being connected to the micro-of described reference voltage module input
Mode transfer block, described fine setting module includes that the fine-adjusting unit of multiple parallel connection, each fine-adjusting unit include resistance and the fuse of series connection, logical
Cross and different fuses are blown the output realizing different resistance values, enter with the reference voltage that described reference voltage module is exported
Row sum-equal matrix, and then realize the fine setting to output electric current.
Preferably, described LED two ends constant-current driven chip uses TO-252 encapsulation or COB encapsulation.
As it has been described above, LED two ends of the present utility model constant-current driven chip, have the advantages that
The power system structure of LED two ends of the present utility model constant-current driven chip is simple, it is not necessary to peripheral components is the most permissible
Realizing outstanding constant-current characteristics, have running voltage low, operating current is little, and power consumption is few, volume is little, low cost and other advantages.
Additionally, due to only two PIN, and without peripheral components, be therefore applicable to TO-252 encapsulation, COB encapsulation or
Person does multi-chip package as two terminal device together with LED chip.LED two ends the most of the present utility model constant-current driven chip is also
It is integrated with temperature compensation function, other chips encapsulated can be carried out temperature protection, and then it is whole to improve system together with this chip
The temperature characterisitic of body.
Accompanying drawing explanation
Fig. 1 is shown as LED constant current of the prior art and controls the schematic diagram of drive system.
Fig. 2 is shown as a kind of structural representation of LED two ends of the present utility model constant-current driven chip.
Fig. 3 is shown as the structural representation of temperature compensation module of the present utility model.
Fig. 4 is shown as the another kind of structural representation of LED two ends of the present utility model constant-current driven chip.
Fig. 5 is shown as LED two ends of the present utility model constant-current driven chip and is applied to the schematic diagram of LED control system.
Element numbers explanation
1 LED two ends constant-current driven chip
11 current sample modules
12 power module of voltage regulation
13 reference voltage modules
14 amplifier modules
15 temperature compensation module
151 first temperature detecting units
152 voltage compensation units
16 high temperature protection modules
161 second temperature detecting units
17 fine setting modules
Detailed description of the invention
Below by way of specific instantiation, embodiment of the present utility model being described, those skilled in the art can be by this theory
Content disclosed by bright book understands other advantages of the present utility model and effect easily.This utility model can also be by additionally
Different detailed description of the invention is carried out or applies, the every details in this specification can also based on different viewpoints with should
With, under without departing from spirit of the present utility model, carry out various modification or change.
Refer to Fig. 2～Fig. 5.It should be noted that the diagram provided in the present embodiment illustrates this most in a schematic way
The basic conception of utility model, the most graphic in time only display with relevant assembly in this utility model rather than is implemented according to reality
Component count, shape and size are drawn, and during its actual enforcement, the kenel of each assembly, quantity and ratio can be a kind of random changing
Become, and its assembly layout kenel is likely to increasingly complex.
Embodiment one
As in figure 2 it is shown, this utility model provides a kind of LED two ends constant-current driven chip 1, described LED two ends constant-current driving
Chip 1 includes:
Power tube M1, current sample module 11, power module of voltage regulation 12, reference voltage module 13, amplifier module 14, temperature
Compensating module 15, high temperature protection module 16 and fine setting module 17.
As in figure 2 it is shown, the drain terminal of described power tube M1 connects external LED lamp string as the first external-connected port, grid end connects
The outfan of described amplifier module 14, is flowed through the electric current of external LED lamp string, enters by the self-adaptative adjustment of described amplifier module 14
And realize current constant control.
Specifically, as in figure 2 it is shown, described power tube M1 is nmos device, its drain terminal is as the first external-connected port, in this reality
Executing in example, described first external-connected port is the driving output pin DRAIN of described LED two ends constant-current driven chip 1, connects outside
The negative terminal of LED string, powers for described LED two ends constant-current driven chip 1 simultaneously.Described power tube M1 is by described amplifier module 14
The Control of Voltage of output, controls to flow through the electric current of described power tube M1 by adjusting the gate voltage of described power tube M1, and then
Realize the current constant control to outside LED string.
As in figure 2 it is shown, one end of described current sample module 11 connects the source of described power tube M1, the other end is by the
Two external-connected port ground connection, the electric current flowing through described power tube M1 is sampled, and is converted into electricity by described current sample module 11
Stream sampled voltage Vcs.
Specifically, as in figure 2 it is shown, in the present embodiment, described current sample module 11 is a resistance, described by flowing through
The electric current of power tube M1 flows through the electric current of described power tube M1 in ohmically pressure drop reflection, and then with current sample voltage Vcs
Form feedback flow through the size of electric current of external LED lamp string.In the present embodiment, described second external-connected port is described LED
The system earth foot GND of two ends constant-current driven chip 1, it is provided that with reference to ground.
As in figure 2 it is shown, described power module of voltage regulation 12 is connected to described first external-connected port, from described first external-connected port
Obtain electric energy and produce the supply voltage Vdd of described LED two ends constant-current driven chip 1.
Specifically, as in figure 2 it is shown, described power module of voltage regulation 12 is defeated from the driving of described LED two ends constant-current driven chip 1
Go out foot DRAIN and obtain electric energy, and then produce the supply voltage Vdd of described LED two ends constant-current driven chip 1, for described LED two ends
Each module in constant-current driven chip 1 provides running voltage, it is not necessary to chip exterior energy-storage travelling wave tube.In the present embodiment, described surely
Voltage source module 12 uses low pressure difference linear voltage regulator (LDO, low dropout regulator) to realize, in actual use,
Described power module of voltage regulation 12 can use the mu balanced circuit of arbitrary structures to produce supply voltage Vdd, is not limited with the present embodiment.
As in figure 2 it is shown, described reference voltage module 13 is connected to described power module of voltage regulation 12, it is used for producing reference voltage
Vref。
Specifically, as in figure 2 it is shown, in the present embodiment, described reference voltage module 13 uses band-gap reference circuit
(Bandgap) corresponding reference voltage is produced, in actual use, any reference voltage generating circuit structure of the prior art
All it is applicable to reference voltage module 13 of the present utility model, is not limited with the present embodiment.
As in figure 2 it is shown, described temperature compensation module 15 is connected to the outfan of described current sample module 11, by institute
State the temperature of LED two ends constant-current driven chip 1 local environment to carry out detection and be compensated voltage, and by described compensation voltage-drop loading
Press to described sampled point, to adjust the electric current flowing through external LED lamp string.
Specifically, as it is shown on figure 3, described temperature compensation module 15 includes the first temperature detecting unit 151 and voltage compensation
Unit 152.The temperature of described LED two ends constant-current driven chip 1 local environment is examined by described first temperature detecting unit 151
Survey, compare to obtain with the junction temperature of temperature detection device by the temperature of described LED two ends constant-current driven chip 1 local environment
Temperature variation, in the present embodiment, temperature variation exports as an electrical current.Described temperature detection device is temperature sensitization apparatus
Part, includes but not limited to thermal diode, critesistor, temperature-sensitive audion etc..Described voltage compensation unit 152 is by described temperature
Variable quantity is converted into corresponding voltage signal, obtains described compensation voltage Vcomp.Described compensation voltage Vcomp is loaded into institute
State on current sample voltage Vcs and export.In the present embodiment, when the temperature of described LED two ends constant-current driven chip 1 local environment
When degree is higher than the junction temperature of described temperature detection device, the output of described temperature compensation module 15 compensates voltage Vcomp, described compensation electricity
Pressure Vcomp and described current sample voltage Vcs is added to set relation so that described current sample voltage Vcs increases.
As in figure 2 it is shown, the input of described amplifier module 14 connects described reference voltage module 13 and described temperature respectively
Compensating module 15, outfan connects the grid end of described power tube M1, produces the driving signal controlling described power tube M1.
Specifically, as in figure 2 it is shown, in the present embodiment, described amplifier module 14 uses operational amplifier to realize, arbitrarily its
He can realize the circuit structure of " empty short " function and all be applicable to amplifier module 14 of the present utility model, is not limited with the present embodiment.
In the present embodiment, the inverting input of described operational amplifier connects described temperature compensation module 15, normal phase input end connects
Described reference voltage module 13, outfan connects the grid end of described rate switching tube M1, realizes anti-phase input by self-adaptative adjustment
The magnitude of voltage that end receives with normal phase input end is equal, and in the present embodiment, the most described reference voltage Vref is equal to described compensation
Voltage Vcomp and described sampled voltage Vcs's and.The connection of the end of oppisite phase of described operational amplifier, positive terminal and each signal is closed
Being, and the logical relation of output level can adjust according to side circuit, those skilled in the art is understanding that this practicality is new
Corresponding adjustment can be made on the basis of type, be not limited with the present embodiment.
As in figure 2 it is shown, described high temperature protection module 16 is connected to the grid end of described power tube M1, detect described LED in real time
The temperature of two ends constant-current driven chip 1 local environment, when the temperature of described LED two ends constant-current driven chip 1 local environment affects
During the normal operating conditions of each semiconductor device, described high temperature protection module 16 directly turns off described power tube M1, to each device
Carry out high temperature protection.
Specifically, as in figure 2 it is shown, in the present embodiment, described high temperature protection module 16 includes the second temperature detecting unit
161 and lower trombone slide M2.Described second temperature detecting unit 161 temperature to described LED two ends constant-current driven chip 1 local environment
Detect, when the temperature of described LED two ends constant-current driven chip 1 local environment is higher than design temperature, output one protection letter
Number.Described lower trombone slide M2 is connected to the outfan of described second temperature detecting unit 161, receives described protection signal, when described
During protection signal onset, the grid terminal voltage of described power tube M1 is dragged down, and then turn off described power tube M1.In the present embodiment,
Described lower trombone slide M2 uses nmos device, and its grid end connects described second temperature detecting unit 161, drain terminal connects described power tube
The grid end of M1, source ground connection, the onset when described protection signal is high level, described lower trombone slide M2 turns on, described power tube M1
Grid terminal voltage be directly pulled down to reference to ground.Described lower trombone slide M2 can also use PMOS device to realize, it is only necessary to described
The logic level of protection signal is modified, and circuit structure and logic level with the present embodiment are not limited.
As in figure 2 it is shown, described fine setting module 17 is connected to the input of described reference voltage module 13, by described ginseng
That examines voltage Vref adjusts the fine setting realizing that described LED two ends constant-current driven chip 1 exports electric current, to make up various technique by mistake
The deviation of the output electric current that difference causes so that output electric current is close to the constant current output value set.
Specifically, in the present embodiment, described fine setting module 17 includes the fine-adjusting unit of multiple parallel connection, each fine-adjusting unit bag
Including resistance and the fuse of series connection, the resistance in each fine-adjusting unit is proportionate relationship.By different fuses are blown
Realize the output of different resistance values.
Described LED two ends constant-current driven chip 1 uses TO-252 encapsulation or COB encapsulation, can be greatly reduced production cost.
LED two ends of the present utility model constant-current driven chip 1 has been internally integrated power supply, current constant control, temperature-compensating, high temperature
The functional modules such as protection, fine setting, multiple functional, stable performance.Wherein, LED two ends of the present utility model constant-current driven chip 1
Power system structure is simple, it is not necessary to peripheral components just can realize outstanding constant-current characteristics, has running voltage low, operating current
Little, power consumption is few, volume is little, low cost and other advantages；Meanwhile, LED two ends of the present utility model constant-current driven chip is by integrated
Other chips encapsulated together with this chip are carried out temperature protection, and then improve the temperature that system is overall by temperature compensation module
Characteristic.Additionally, due to only two PIN, and without peripheral components, therefore it is applicable to TO-252 encapsulation, COB encapsulation or makees
Multi-chip package is done together with LED chip for two terminal device.
Embodiment two
As shown in Figure 4, this utility model provides a kind of LED two ends constant-current driven chip 1, described LED two ends constant-current driving
Chip 1 includes: power tube M1, current sample module 11, power module of voltage regulation 12, reference voltage module 13, amplifier module 14 temperature
Degree compensating module 15, high temperature protection module 16 and fine setting module 17.
The LED two ends constant-current driven chip of the present embodiment different from the LED two ends constant-current driven chip in embodiment one it
Place is, described temperature compensation module 15 is connected to the input of described reference voltage module 13, by permanent to described LED two ends
The temperature of stream driving chip 1 local environment carries out detection and is compensated voltage Vcomp, and is loaded by described compensation voltage Vcomp
On described reference voltage, to adjust the electric current flowing through external LED lamp string.
Specifically, as shown in Figure 4, described current sample module 11 is directly connected in described amplifier module 14.Described temperature
Compensating module 15 is connected to the input of described reference voltage module 13.Specifically, as it is shown on figure 3, described temperature compensation module
The circuit structure of 15 sees Fig. 3, repeats the most one by one at this.In the present embodiment, when described LED two ends constant-current driven chip 1 institute
When the temperature of place's environment is higher than the junction temperature of described temperature detection device, the output of described temperature compensation module 15 compensates voltage Vcomp,
Described compensation voltage Vcomp subtracts each other with setting relation with described reference voltage Vref so that described reference voltage Vref reduces.Institute
The end of oppisite phase stating operational amplifier connects described current sample module 11, normal phase input end connects described reference voltage module 13,
Outfan connects the grid end of described rate switching tube M1, realizes inverting input by self-adaptative adjustment and receives with normal phase input end
Magnitude of voltage equal, in the present embodiment, the difference of the most described reference voltage Vref and described compensation voltage Vcomp be equal to described in adopt
Sample voltage Vcs.The end of oppisite phase of described operational amplifier, positive terminal and the annexation of each signal, and the logic of output level
Relation can adjust according to side circuit, and those skilled in the art can make corresponding on the basis of understanding is of the present utility model
Adjust, be not limited with the present embodiment.
The constant-current driving method of above-mentioned LED two ends constant-current driven chip 1 is as follows:
As it is shown in figure 5,220V alternating voltage is by being input to the anode of LED string after rectifier bridge, bearing of described LED string
End connects the driving output pin DRAIN of described LED two ends constant-current driven chip 1, described LED two ends constant-current driven chip 1 be
System grounding leg GND connects with reference to ground.
As shown in Fig. 2～Fig. 5, described constant-current driving method at least includes:
Original state, described power tube M1 is in the conduction state, along with the rising of input voltage, described first external-connected port
Voltage raise, described LED two ends constant-current driven chip 1 enters duty.
Specifically, along with the rising of described input voltage, described LED start of string turns on, and electric current flows through described LED
String, and provided for described LED two ends constant-current driven chip 1 by the first external-connected port of described LED two ends constant-current driven chip 1
Electric energy.When described power module of voltage regulation 12 produces supply voltage Vdd, in described LED two ends constant-current driven chip 1, each module is opened
Beginning work.
The electric current flowing through described power tube M1 is sampled by described current sample module 11, and by current sample voltage
Vcs is input to the first input end of amplifier module 14.Described reference voltage module 13 produces reference voltage Vref, and by described ginseng
Examine the voltage Vref input Vref the second input to described amplifier module 14.
Specifically, in the present embodiment, the first input end of described amplifier module 14 is inverting input, the second input
For normal phase input end.Described amplifier module 14 realizes " empty short " function, realizes inverting input and positive by self-adaptative adjustment
The magnitude of voltage that input receives is equal.
Specifically, the end of oppisite phase of described amplifier module 14, positive terminal and the annexation of each signal, and output level
Logical relation can adjust according to side circuit, and those skilled in the art can make phase on the basis of understanding is of the present utility model
The adjustment answered, is not limited with the present embodiment.
Meanwhile, described temperature compensation module 15 detects the temperature of described LED two ends constant-current driven chip 1 local environment, when
When the temperature of described LED two ends constant-current driven chip 1 local environment is more than design temperature, reduce the electricity flowing through described power tube M1
Stream, and then realize temperature-compensating.Described design temperature can be set according to actual needs by those skilled in the art, at this not
Limit one by one.
Specifically, described first temperature detecting unit 151 temperature to described LED two ends constant-current driven chip 1 local environment
Degree detects, and the temperature of described LED two ends constant-current driven chip 1 local environment is compared with the junction temperature of temperature detection device
Relatively to obtain temperature variation, and export as an electrical current；Described temperature variation is converted into by described voltage compensation unit 152
Corresponding voltage signal, obtains described compensation voltage Vcomp.
In the present embodiment, when the temperature of described LED two ends constant-current driven chip 1 local environment is higher than 135 DEG C, described
Compensate voltage Vcomp and described current sample voltage Vcs and be added to set relation so that described current sample voltage Vcs increases,
The output result making described amplifier module 14 changes, and then flows through the electric current of described LED string according to setting curve
Reduce.Or, when the temperature of described LED two ends constant-current driven chip 1 local environment is higher than 135 DEG C, described compensation voltage
Vcomp subtracts each other with setting relation with described current sample voltage Vcs so that described reference voltage Vref reduces so that described fortune
The output result of amplification module 14 changes, and then the electric current flowing through described LED string reduces according to setting curve.In like manner,
When the temperature of described LED two ends constant-current driven chip 1 local environment is close to 155 DEG C, the electric current flowing through described LED string is fast
Speed drops to 0, can avoid LED by this temperature compensation function because ambient temperature is high, and the temperature caused frequently is protected and caused
Scintillation.
Further, described high temperature protection module 16 detects the temperature of described LED two ends constant-current driven chip 1 local environment in real time
Degree, when the temperature of described LED two ends constant-current driven chip 1 local environment affects the normal operating conditions of each semiconductor device,
Described high temperature protection module 16 directly turns off described power tube M1, and each device is carried out high temperature protection.
Further, according to flowing through the actual current of described power tube M1, fusing different in the described fine setting module 17 that fuses
Silk, it is achieved the fine setting to the electric current flowing through described power tube M1.
In sum, this utility model provides a kind of LED two ends constant-current driven chip, including power tube；Obtain electric current to adopt
The current sample module of sample voltage；The power module of voltage regulation of supply voltage is provided；Produce the reference voltage module of reference voltage；Right
Current sample voltage and reference voltage compare to control the amplifier module of output electric current；And when ambient temperature is higher than setting
The temperature compensation module protected is carried out during temperature.Original state, power tube is in the conduction state, and current sample module is to flowing through
The electric current stating power tube is sampled, and obtains current sample voltage；Reference voltage module produces reference voltage；Amplifier module is passed through
Self-adaptative adjustment flows through the electric current of described power tube, and to realize described reference voltage equal with described current sample voltage, and then realizes
Constant current output；Meanwhile, detect ambient temperature, when ambient temperature is more than design temperature, reduce the electric current flowing through power tube, and then
Realize temperature-compensating.The power system structure of LED two ends of the present utility model constant-current driven chip is simple, it is not necessary to peripheral components is just
Can realize outstanding constant-current characteristics, have running voltage low, operating current is little, and power consumption is few, volume is little, low cost and other advantages.
Additionally, due to only two PIN, and without peripheral components, therefore it is applicable to TO-252 encapsulation, COB encapsulation or as two
End-apparatus part does multi-chip package together with LED chip.LED two ends the most of the present utility model constant-current driven chip is also integrated with temperature
Degree compensates function, other chips encapsulated can carry out temperature protection, and then improve the temperature that system is overall together with this chip
Characteristic.So, this utility model effectively overcomes various shortcoming of the prior art and has high industrial utilization.
Above-described embodiment only illustrative principle of the present utility model and effect thereof are new not for limiting this practicality
Type.Above-described embodiment all can be carried out by any person skilled in the art under spirit and the scope of the present utility model
Modify or change.Therefore, art has usually intellectual such as without departing from the essence disclosed in this utility model
All equivalences completed under god and technological thought are modified or change, and must be contained by claim of the present utility model.
Claims (8)
1. a LED two ends constant-current driven chip, it is characterised in that described LED two ends constant-current driven chip at least includes:
Power tube, current sample module, power module of voltage regulation, reference voltage module, amplifier module and temperature compensation module；
The drain terminal of described power tube connects external LED lamp string as the first external-connected port, and grid end connects the defeated of described amplifier module
Go out end, flowed through the electric current of external LED lamp string by the self-adaptative adjustment of described amplifier module, and then realize current constant control；
One end of described current sample module connects the source of described power tube, and the other end passes through the second external-connected port ground connection, institute
State current sample module the electric current flowing through described power tube is sampled, and be converted into current sample voltage；
Described power module of voltage regulation is connected to described first external-connected port, obtains electric energy from described first external-connected port and produces institute
State the supply voltage of LED two ends constant-current driven chip；
Described reference voltage module is connected to described power module of voltage regulation, is used for producing reference voltage；
The input of described amplifier module connects described current sample module and described reference voltage module respectively, and outfan connects
The grid end of described power tube, the voltage of two inputs realizing described amplifier module by self-adaptative adjustment is equal；
Described temperature compensation module is connected between described current sample module and described amplifier module, or is connected to described benchmark
The input of voltage module, is compensated by the temperature of described LED two ends constant-current driven chip local environment is carried out detection
Voltage, and described compensation voltage-drop loading to described sampling is pressed or on described reference voltage, flow through external LED lamp string to adjust
Electric current.
LED two ends the most according to claim 1 constant-current driven chip, it is characterised in that: described temperature compensation module includes:
First temperature detecting unit, voltage compensation unit；
The temperature of described LED two ends constant-current driven chip local environment is detected by described first temperature detecting unit, and produces
Raw temperature variation；
Described temperature variation is converted into corresponding voltage signal by described voltage compensation unit, obtains described compensation voltage.
LED two ends the most according to claim 2 constant-current driven chip, it is characterised in that: described first temperature detecting unit
Compare to obtain temperature by the temperature of described LED two ends constant-current driven chip local environment and the junction temperature of temperature detection device
Variable quantity.
LED two ends the most according to claim 3 constant-current driven chip, it is characterised in that: described temperature detection device includes
Thermal diode, critesistor, temperature-sensitive audion.
LED two ends the most according to claim 1 constant-current driven chip, it is characterised in that: described LED two ends constant-current driving core
Sheet also includes: be connected to the high temperature protection module of described power tube grid end, and described high temperature protection module includes the second temperature detection
Unit and lower trombone slide；
The temperature of described LED two ends constant-current driven chip local environment is detected by described second temperature detecting unit, works as institute
When stating the normal operating conditions of the temperature each semiconductor device of impact of LED two ends constant-current driven chip local environment, output one guarantor
Protect signal；
Described lower trombone slide is connected to the outfan of described second temperature detecting unit, when described protection signal onset by described merit
The grid terminal voltage of rate pipe drags down, and then turns off described power tube.
LED two ends the most according to claim 5 constant-current driven chip, it is characterised in that: described lower trombone slide is nmos device,
The grid end of described lower trombone slide connects described second temperature detecting unit, drain terminal connects the grid end of described power tube, source ground connection.
LED two ends the most according to claim 1 constant-current driven chip, it is characterised in that: described LED two ends constant-current driving core
Sheet also includes the fine setting module being connected to described reference voltage module input, and described fine setting module includes the fine setting of multiple parallel connection
Unit, each fine-adjusting unit includes resistance and the fuse of series connection, realizes different resistance values by blowing different fuses
Output, is adjusted with the reference voltage exporting described reference voltage module, and then realizes the fine setting to output electric current.
LED two ends the most according to claim 1 constant-current driven chip, it is characterised in that: described LED two ends constant-current driving core
Sheet uses TO-252 encapsulation or COB encapsulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620788615.XU CN205883648U (en) | 2016-07-26 | 2016-07-26 | LED both ends constant current drive chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620788615.XU CN205883648U (en) | 2016-07-26 | 2016-07-26 | LED both ends constant current drive chip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205883648U true CN205883648U (en) | 2017-01-11 |
Family
ID=57697489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620788615.XU Expired - Fee Related CN205883648U (en) | 2016-07-26 | 2016-07-26 | LED both ends constant current drive chip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205883648U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107148125A (en) * | 2017-07-17 | 2017-09-08 | 重庆中科芯亿达电子有限公司 | A kind of linear constant current infrared LED driving chip |
| CN107660013A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | A kind of LED both ends constant-current driven chip and constant current driving method |
| 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 |
| CN112203382A (en) * | 2020-09-30 | 2021-01-08 | 杭州启绿科技有限公司 | Light source driving device and driving method |
| CN114684581A (en) * | 2022-05-31 | 2022-07-01 | 四川明泰微电子科技股份有限公司 | Plastic envelope chip detects uses loading attachment |
-
2016
- 2016-07-26 CN CN201620788615.XU patent/CN205883648U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107660013A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | A kind of LED both ends constant-current driven chip and constant current driving method |
| CN107660013B (en) * | 2016-07-26 | 2024-04-05 | 上海莱托思电子科技有限公司 | LED two-end constant-current driving chip and constant-current driving method |
| CN107148125A (en) * | 2017-07-17 | 2017-09-08 | 重庆中科芯亿达电子有限公司 | A kind of linear constant current infrared LED driving chip |
| CN107148125B (en) * | 2017-07-17 | 2018-10-26 | 重庆中科芯亿达电子有限公司 | A kind of linear constant current infrared LED driving chip |
| 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 |
| CN112203382A (en) * | 2020-09-30 | 2021-01-08 | 杭州启绿科技有限公司 | Light source driving device and driving method |
| CN114684581A (en) * | 2022-05-31 | 2022-07-01 | 四川明泰微电子科技股份有限公司 | Plastic envelope chip detects uses loading attachment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205883648U (en) | LED both ends constant current drive chip | |
| CN107529241B (en) | A kind of linear Constant-power LED drive circuit of single hop and method | |
| CN107529242B (en) | A kind of LED drive circuit and method of equalization efficiency and power factor | |
| CN107660013A (en) | A kind of LED both ends constant-current driven chip and constant current driving method | |
| CN108306492A (en) | A kind of adaptive output current removes ripple circuit and its goes ripple method | |
| CN206181442U (en) | Bleeder circuit and LED control circuit | |
| CN106329959B (en) | High pressure self-powered circuit | |
| CN105636303A (en) | Constant-current control circuit and method | |
| CN103354685B (en) | LED driving chip | |
| CN205724364U (en) | Laser power supply | |
| CN203134330U (en) | LED display screen backlight brightness adjusting circuit and LED television | |
| CN205830093U (en) | A kind of self feed back LED filament and the load of self feed back connection in series-parallel high-voltage LED | |
| CN201014383Y (en) | LED series connecting application protection circuit | |
| CN207008452U (en) | One kind suspends and follows voltage-stabilized power supply circuit device | |
| CN105934026B (en) | A kind of both-end constant-current LED driving chip | |
| CN107302813B (en) | A kind of current control circuit | |
| CN205213087U (en) | Novel high -voltage line nature of can adjusting luminance LED drive power supply | |
| CN105049022B (en) | Interface circuit | |
| CN202818716U (en) | Current equalizing circuit applied to LED backlight multiplex output | |
| CN109302777A (en) | LED dimming device and light adjusting system | |
| CN209419956U (en) | LED dimming device and light adjusting system | |
| CN107965688A (en) | A kind of nonpolarity LED light bar, filament and LED light | |
| CN208754580U (en) | A kind of linear constant current driving chip and multi-chip parallel connection LED illumination driving circuit | |
| CN208970509U (en) | A kind of motor driven power module circuit based on three base island structures | |
| CN101383557A (en) | Current defined charge pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 Termination date: 20200726 |