CN205987461U

CN205987461U - LED constant current drive chip, device and LED lamp

Info

Publication number: CN205987461U
Application number: CN201620885498.9U
Authority: CN
Inventors: 胡渊
Original assignee: Limited Co Of Fu Man Electronics Group Of Shenzhen
Current assignee: Fuman Microelectronics Group Co ltd
Priority date: 2016-08-15
Filing date: 2016-08-15
Publication date: 2017-02-22
Anticipated expiration: 2026-08-15

Abstract

The utility model belongs to the LED drive control field provides a LED constant current drive chip, device and LED lamp. The utility model discloses an adopt and include electric detection module down, the loop counter, code decoding module, pulse width modulating module, a constant current driver module and the 2nd constant current driver module's LED constant current drive chip, it predetermines the biggest turn -on time to be reached at the turn -on time who detects the switch tube by lower electric detection module, and the turn -off time of switch tube is less than predetermines overvoltage protection during the shut -in time, declare electricity and the aversion of cybernetic loop counter under the turning -off power supply switch, by code decoding module according to the aversion result, when switch goes up the electricity once more, it is luminous to control corresponding LED lamp cluster, adjust in order to realize the colour temperature, give out light, give off light with the corresponding LED lamp cluster of presupposition current drive by pulse width modulating module, in order to realize adjustting of the lighteness, it adjusts and adjustting of the lighteness to make the LED constant current drive chip accurately carry out the colour temperature to LED lamp cluster under switch's control.

Description

A kind of LED constant current driving chip, device and LED

Technical field

This utility model belongs to LED Drive Control Technique field, more particularly, to a kind of LED constant current driving chip, device and LED.

Background technology

Existing LED dim color-temperature regulating system be by LED constant current driving chip detect the lower electricity number of times of on and off switch Lai Colour temperature regulation and brightness regulation are carried out to LED string.As shown in figure 1, when electricity under on and off switch, the bus capacitor after rectifier bridge The voltage of CL can decline, and leads to the voltage of the supply pin of LED constant current driving chip to decline, by the low pressure in LED constant current chip Detection module detects the voltage of the supply pin of LED constant current chip, when the voltage of supply pin LED constant current driving chip is detected is little When preset voltage value, low pressure detection module judges under on and off switch electricity and exports corresponding control signal, when on and off switch again During secondary upper electricity, control module controls cold light LED control circuit and/or warm light LED control circuit execution phase according to this control signal The colour temperature answered is adjusted and brightness regulation.

However, because LED light modulation color-temperature regulating system is when being in overvoltage protection or overcurrent protection state, also can be drop-down The voltage of the supply pin of LED constant current driving chip and trigger low pressure detection module, therefore, adopt and come on and off switch in this way Lower electricity number of times carry out detecting not accurate；And if, the voltage of driving LED string is higher, after electricity under on and off switch, bus The energy of electric capacity CL storage can pass through to start resistance RST again by the voltage high of the supply pin of LED constant current driving chip, thus The phenomenon that on and off switch principal repeatedly triggers low pressure detection module occurs, leads to the colour temperature of LED string to adjust and brightness tune Section is not controlled by and off switch.

In summary, there is the lower electricity on and off switch for the LED constant current driving chip in existing LED light modulation color-temperature regulating system Number detection inaccurate and lead to the colour temperature to LED string to adjust and brightness regulation be not subject on and off switch control problem.

Utility model content

The purpose of this utility model is to provide a kind of LED constant current driving chip, driving means and LED it is intended to solve There is LED constant current driving chip and the lower electricity number of times detection of on and off switch inaccurately led in existing LED light modulation color-temperature regulating system Cause the colour temperature of LED string is adjusted and brightness regulation be not subject on and off switch control problem.

This utility model is achieved in that a kind of LED constant current driving chip, with first in cold light LED control circuit Second switch pipe in switching tube and warm light LED control circuit connects, and described LED constant current driving chip passes through to control described first The break-make of switching tube and/or described second switch pipe is to carry out perseverance to described cold light LED lamp string and/or described warm light LED string Flow control, described cold light LED control circuit and described warm light LED control circuit under the control of on and off switch, respectively to cold light LED string and warm light LED string execution colour temperature adjusts and brightness regulation is it is characterised in that described LED constant current driving chip bag Include：First time electro-detection module, second time electro-detection module, cycle counter, coding and decoding module, pulse width modulation module, One constant-current driven module and the second constant-current driven module；

The test side of the test side of described first time electro-detection module and described second time electro-detection module respectively with described The drive control end of the drive control end of the first constant-current driven module and described second constant-current driven module connects, described circulation meter Number the first control end of devices, the second control end and outfan respectively with the outfan of described first time electro-detection module, described the The input of the outfan of two times electro-detection modules and described coding and decoding module connects, and the first of described coding and decoding module is defeated Go out end, the second outfan and the 4th outfan the first control end, described second perseverance respectively with described first constant-current driven module The control end of the first control end of stream drive module and described pulse width modulation module connects, and the 3rd of described coding and decoding module is defeated Go out end to be connected with the second control end of described first constant-current driven module and the second control end of described second constant-current driven module, 3rd control end of the outfan of described pulse width modulation module and described first constant-current driven module and described second constant-current driving 3rd control end of module connects, the detection of the test side of described first constant-current driven module and described second constant-current driven module End is connected with the cold end of described first switch pipe and the cold end of described second switch pipe respectively；

Described first time electro-detection module detects ON time and the turn-off time of described first switch pipe, when detecting The ON time stating first switch pipe reaches default maximum ON time, and the turn-off time of described first switch pipe is less than and presets During the overvoltage protection shut-in time, described first time electro-detection module judges electric under described on and off switch and exports shift control letter Number；Described second time electro-detection module detects ON time and the turn-off time of described second switch pipe, when detecting described the The ON time of two switching tubes reaches default maximum ON time, and the turn-off time of described second switch pipe is less than preset overpressure During the protection shut-in time, described second time electro-detection module judges electric under described on and off switch and exports shift control signal；Institute State cycle counter and be circulated according to described shift control signal and shift and export shift result；Described coding and decoding module will Described shift result is converted to corresponding state control signal, and when described on and off switch goes up electricity again, according to described state Control signal controls described first constant-current driven module and/or described second constant-current driven module to drive described cold light LED to control Circuit and/or the described colour temperature of described warm light LED control circuit execution are adjusted；Described pulse width modulation module is receiving described coding During the state control signal of decoding module output, described first constant-current driven module and institute are controlled according to described state control signal Stating the second constant-current driven module makes described cold light LED control circuit and described warm light LED control circuit control respectively with predetermined current Make described cold light LED lamp string and described warm light LED string to light according to predetermined luminance.

This utility model additionally provides a kind of LED constant current driving means, connects with cold light LED lamp string and warm light LED series winding, Described LED constant current driving means include on and off switch, rectification module, the first bus capacitor, cold light LED control circuit and warm light LED control circuit, described LED constant current driving means also include above-mentioned LED constant current driving chip；

The first end of described on and off switch and the second end connect the outfan of alternating current power supply and the defeated of described rectification module respectively Enter to hold, the supply pin of the first output described LED constant current driving chip of termination of described rectification module, the second of described rectification module Outfan, the input of described cold light LED lamp string, the first control end of described cold light LED control circuit, described warm light LED The input of string, the first control end of described warm light LED control circuit are connected to the positive pole of described first bus capacitor altogether, and described the The of the minus earth of one bus capacitor, the second control end of described cold light LED control circuit and described warm light LED control circuit Two control ends connect the outfan of described cold light LED lamp string and the outfan of described warm light LED string respectively；

Described cold light LED control circuit include first switch pipe, the first load capacitance, the first load resistance, the first inductance, First fly-wheel diode and the first crest voltage detection resistance；Described warm light LED control circuit includes second switch pipe, second negative Carry electric capacity, the second load resistance, the second inductance, the second fly-wheel diode and the second crest voltage detection resistance；

The positive pole of described first load capacitance, the first end of described first load resistance and described first fly-wheel diode Negative electrode connects the first control end as described cold light LED control circuit altogether, the negative pole of described first load capacitance, described first negative The first end at the second end and described first inductance that carry resistance connects the second control end as described cold light LED control circuit altogether, The anode of the second end of described first inductance and described first fly-wheel diode is connected to the hot end of described first switch pipe altogether, The control end of described first switch pipe and cold end control foot and the respectively with the first grid of described LED constant current driving chip One source electrode controls foot to connect, the first end of described first crest voltage detection resistance and the first of described LED constant current driving chip Crest voltage detection foot connects, the second end ground connection of described first crest voltage detection resistance；Described second load capacitance is just The negative electrode of pole, the first end of described second load resistance and described second fly-wheel diode connects altogether and controls as described warm light LED First control end of circuit, the negative pole of described second load capacitance, the second end of described second load resistance and described second electricity The first end of sense connects the second control end as described warm light LED control circuit altogether, the second end of described second inductance with described The anode of the second fly-wheel diode is connected to the hot end of described second switch pipe altogether, the control end of described second switch pipe and low Potential end controls foot and the second source electrode to control foot to be connected respectively with the second grid of described LED drive chip, described second peak value The first end of voltage detection resistances is connected with the second crest voltage detection foot of described LED constant current driving chip, described second peak Second end ground connection of threshold voltage detection resistance.

This utility model additionally provides a kind of LED, and including cold light LED lamp string and warm light LED string, described LED is also Including LED constant current driving means described above.

This utility model includes first time electro-detection module, second time electro-detection module, cycle counter, volume by adopting Code decoding module, the LED constant current driving chip of pulse width modulation module, the first constant-current driven module and the second constant-current driven module, Default maximum ON time is reached in ON time first switch pipe is detected by first time electro-detection module, and first switch When the turn-off time of pipe is less than the preset overpressure protection shut-in time, judges electric under on and off switch and export shift control signal, by Second time electro-detection module reaches default maximum ON time in ON time second switch pipe is detected, and second switch pipe Turn-off time when being less than the preset overpressure protection shut-in time, judge under on and off switch electric and export shift control signal, by following Inner loop counter is circulated according to shift control signal and shifts and export shift result, is turned shift result by coding and decoding module It is changed to corresponding state control signal, and when on and off switch goes up electricity again, corresponding constant current is controlled according to state control signal Drive module works, and to drive corresponding LED string to be lighted, and then realizes the purpose that colour temperature is adjusted, and by pulsewidth modulation Module, when receiving state control signal, controls corresponding constant-current driven module to drive corresponding LED string with predetermined current Lighted, and then realized the purpose of brightness regulation, so that LED constant current driving chip is accurate under the control of on and off switch Ground is adjusted and brightness regulation to LED string execution colour temperature.

Brief description

Fig. 1 is the structural representation of the LED constant current driving chip that prior art provides；

Fig. 2 is the modular structure schematic diagram of the LED constant current driving chip that this utility model embodiment provides；

Fig. 3 is the modular structure schematic diagram of the LED constant current driving chip that this utility model embodiment provides；

Fig. 4 is the electrical block diagram of first time electro-detection module that this utility model embodiment provides；

Fig. 5 is the electrical block diagram of second time electro-detection module that this utility model embodiment provides；

Fig. 6 is the electrical block diagram of the LED constant current driving means that this utility model embodiment provides.

Specific embodiment

In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to this utility model.It should be appreciated that specific embodiment described herein is only in order to explain This utility model, is not used to limit this utility model.

This utility model embodiment includes first time electro-detection module, second time electro-detection module, circulation meter by adopting Number device, coding and decoding module, the LED constant current of pulse width modulation module, the first constant-current driven module and the second constant-current driven module are driven Dynamic chip, reaches default maximum ON time by first time electro-detection module in ON time first switch pipe is detected, and When the turn-off time of first switch pipe is less than the preset overpressure protection shut-in time, judges electric under on and off switch and export shift control Signal, reaches default maximum ON time by second time electro-detection module in ON time second switch pipe is detected, and the When the turn-off time of two switching tubes is less than the preset overpressure protection shut-in time, judges electric under on and off switch and export shift control letter Number, it is circulated according to shift control signal by cycle counter and shifts and export shift result, will be moved by coding and decoding module Position result is converted to corresponding state control signal, and when on and off switch goes up electricity again, controls phase according to state control signal The constant-current driven module work answered, to drive corresponding LED string to be lighted, and then realizes the purpose that colour temperature is adjusted, and by Pulse width modulation module, when receiving state control signal, controls corresponding constant-current driven module to drive with predetermined current corresponding LED string is lighted, and then realizes the purpose of brightness regulation, so that LED constant current driving chip is in the control of on and off switch Exactly LED string execution colour temperature is adjusted and brightness regulation under system.

Fig. 2 shows the modular structure of the LED constant current driving chip that this utility model embodiment provides, for the ease of saying Bright, illustrate only the part related to this utility model embodiment, details are as follows：

A kind of first switch pipe 31 in LED constant current driving chip 1, with cold light LED control circuit 3 and warm light LED control Second switch pipe 41 in circuit 4 connects, and LED constant current driving chip 1 passes through to control first switch pipe 31 and/or second switch pipe 41 break-make is to carry out current constant control, cold light LED control circuit 3 and warm light to cold light LED lamp string 5 and/or warm light LED string 6 LED control circuit 4 under the control of on and off switch, respectively to cold light LED lamp string 5 and warm light LED string 6 execution colour temperature adjust and Brightness regulation, LED constant current driving chip 1 includes：First time electro-detection module 10, second time electro-detection module 16, cycle count Device 11, coding and decoding module 12, pulse width modulation module 13, the first constant-current driven module 14 and the second constant-current driven module 15.

Wherein, the test side of the test side of first time electro-detection module 10 and second time electro-detection module 16 is respectively with first The drive control end of the drive control end of constant-current driven module 14 and the second constant-current driven module 15 connects, cycle counter 11 First control end, the second control end and outfan outfan, the second time electro-detection mould with first time electro-detection module 10 respectively The input of the outfan of block 16 and coding and decoding module 12 connects, the first outfan of coding and decoding module 12, the second output End and the 4th outfan are controlled with the first control end of the first constant-current driven module 14, the first of the second constant-current driven module 15 respectively Control end connection, the 3rd outfan of coding and decoding module 12 and first constant-current driven module of end processed and pulse width modulation module 13 Second control end of 14 the second control end and the second constant-current driven module 15 connects, the outfan of pulse width modulation module 15 and the 3rd control end of the 3rd control end of one constant-current driven module 14 and the second constant-current driven module 15 connects, the first constant-current driving The test side of the test side of module 14 and the second constant-current driven module 15 cold end and second with first switch pipe 31 respectively The cold end of switching tube 41 connects.

First time electro-detection module 10 detects ON time and the turn-off time of first switch pipe 31, opens when detecting first The ON time closing pipe 31 reaches default maximum ON time, and the turn-off time of first switch pipe 31 is less than preset overpressure and protects During the shut-in time, first time electro-detection module 10 judges electric under on and off switch and exports shift control signal；Second time electro-detection Module 16 detects ON time and the turn-off time of second switch pipe 41, when ON time second switch pipe 41 is detected reaches Default maximum ON time, and when the turn-off time of second switch pipe 41 is less than the preset overpressure protection shut-in time, second time electricity Detection module 16 judges electric under on and off switch and exports shift control signal；Cycle counter 11 is carried out according to shift control signal Cyclic shift simultaneously exports shift result；Shift result is converted to corresponding state control signal by coding and decoding module 12, and When on and off switch goes up electricity again, the first constant-current driven module 14 and/or the second constant-current driving mould are controlled according to state control signal Block 15 drives cold light LED control circuit 3 and/or warm light LED control circuit 4 execution colour temperature to adjust；Pulse width modulation module 13 is connecing When receiving the state control signal that coding and decoding module 12 exports, the first constant-current driven module 14 is controlled according to state control signal With the second constant-current driven module 15, cold light LED control circuit 3 is made respectively with predetermined current and warm light LED control circuit 4 control cold Light LED string 5 and warm light LED string 6 light according to predetermined luminance, to realize the purpose of brightness regulation.

In this utility model embodiment, default maximum ON time is the first switch pipe 31 pre-setting and second opens Close the maximum ON time of pipe 41, when the ON time of first switch pipe 31 reaches default maximum ON time, the first constant current Drive module 14 controls first switch pipe 31 to turn off, when the ON time of second switch pipe 41 reaches default maximum ON time When, the second constant-current driven module 15 controls second switch pipe 41 to turn off.In this utility model embodiment, when cold light LED lamp string 5 Or the voltage at warm light LED string 6 two ends be higher than pre-set the maximum voltage of LED string when, can trigger system overvoltage guarantor Shield, and the shut-in time triggering system during overvoltage protection is the overvoltage protection shut-in time.

In this utility model embodiment, first time electro-detection module 10 and second time electro-detection module 16 are passed through to examine respectively Survey first switch pipe 31 and the ON time of second switch pipe 41 and the turn-off time judges the whether lower electricity of on and off switch.Specifically , when LED constant current driving chip 1 drives cold light LED control circuit 3 work, first time electro-detection mould 10 detects first switch The ON time of pipe 31 and turn-off time, when ON time first switch pipe 31 is detected reaches default maximum ON time, And the turn-off time of first switch pipe be less than preset overpressure protection the shut-in time when, first time electro-detection module 10 judges that power supply is opened Close lower electricity；When LED constant current driving chip 1 drives warm light LED control circuit 4 work, second time electro-detection module 16 detects the The ON time of two switching tubes 41 and turn-off time, when ON time second switch pipe 41 is detected reaches default maximum conducting Time, and when the turn-off time of second switch pipe 41 is less than the preset overpressure protection shut-in time, second time electro-detection module 16 is sentenced Electricity under power off switch；When LED constant current driving chip 1 simultaneously drives cold light LED control circuit 3 and warm light LED control circuit 4 work When making, first time electro-detection module 10 and second time electro-detection module 16 detect first switch pipe 31 and second switch simultaneously respectively The ON time of pipe 41 and turn-off time, when the ON time that first time electro-detection mould 10 detects first switch pipe 31 reach pre- If maximum ON time, and the turn-off time of first switch pipe 31 is less than preset overpressure and protects the shut-in time, or under second The ON time that electro-detection module 16 detects second switch pipe 41 reaches default maximum ON time, and second switch pipe 41 Turn-off time is less than during the preset overpressure protection shut-in time then it is assumed that electricity under on and off switch, it is achieved thereby that under on and off switch The accurate detection of electric number of times.When electricity under on and off switch, first time electro-detection module 10 or second time electro-detection module 16 export To cycle counter 11, cycle counter 11 is circulated when receiving high level signal and shifts and export shifting high level signal Position result, shift result is converted to corresponding state control signal by coding and decoding module 12 coding and decoding circuit, and by state Control signal is stored, and when on and off switch goes up electricity again, coding and decoding module 12 is corresponding from it by state control signal Outfan is exported.

In this utility model embodiment, the circulation digit of cycle counter 11 and cold light LED control circuit 3 and warm light The total working status number of LED control circuit 4 is equal.For example, when cold light LED control circuit 3 and warm light LED control circuit 4 altogether (cold light LED control circuit 3 works, and warm light LED control circuit 4 does not work three kinds of working conditions；Cold light LED control circuit 3 is not Work, warm light LED control circuit 4 works；Cold light LED control circuit 3 and warm light LED control circuit 4 work simultaneously) when, circulation The circulation digit of enumerator 11 is 3.

In this utility model embodiment, cycle counter 11 can adopt existing with trigger and gate circuit as core Cycle counter.

In this utility model embodiment, coding and decoding module 12 can be using existing by encoder, decoder and storage The coding and decoding circuit of device composition.

In this utility model embodiment, pulse width modulation module can adopt existing with agitator and frequency divider as core Pulse-width modulation circuit, its by gate level circuit combine frequency divider output signal so that obtain certain dutycycle modulation letter Number.

Fig. 3 shows the modular structure of the LED constant current driving chip that this utility model embodiment provides, for the ease of saying Bright, illustrate only the part related to this utility model embodiment, details are as follows：

As shown in figure 3, as this utility model one embodiment, first time electro-detection module 10 includes：First ON time Detector unit 100, the first turn-off time detector unit 102 and the first displacement control unit 101.

The input of the first ON time detector unit 100, the input and first of the first turn-off time detector unit 102 Second input of displacement control unit 101 connects the test side as first time electro-detection module 10, the first ON time inspection altogether Survey the outfan of unit 100 and the first turn-off time detect the outfan of end unit 102 respectively with the first displacement control unit 101 First input end and the 3rd input connect, the outfan of the first displacement control unit 101 is first time electro-detection module 10 Outfan.

When ON time first switch pipe 31 is detected reaches default maximum ON time, the first ON time detection Unit 100 exports high level signal to the first input end of the first displacement control unit 101；When first switch pipe 31 is detected When turn-off time is less than the preset overpressure protection shut-in time, the first turn-off time detector unit 102 output high level is to the first shifting 3rd input of position control unit 101；When the first input end of the first displacement control unit 101 is high level and the first displacement Second input of control unit 101 from high level be changed into low level when, the first displacement control unit 101 output shift control letter Number.

In this utility model embodiment, when cold light LED control circuit 3 normal work, (i.e. first switch pipe 31 is normally led Logical and turn off) when, the first ON time detector unit 100 and the first turn-off time detector unit 102 all export low level signal, To cycle counter 11, cycle counter 11 does not shift now the first displacement control unit 101 output low level signal.Specifically , when LED constant current driving chip 1 drives cold light LED control circuit 3 work, the first ON time detector unit 100 and first Turn-off time detector unit 102 detects ON time and the turn-off time of first switch pipe 31 respectively, when first switch pipe 31 just Often (ON time of first switch pipe 31 is less than default maximum ON time to turn-on and turn-off and the turn-off time is not less than and preset The pressure protection shut-in time) when, the first ON time detector unit 100 and the first turn-off time detector unit 101 all export low electricity Flat, now the first displacement control unit 101 output low level signal, cycle counter 11 does not shift, and when the first ON time The ON time that detector unit 100 detects first switch pipe 31 reaches default maximum ON time, and the inspection of the first turn-off time Survey unit 102 detect first switch pipe 31 turn-off time be less than preset overpressure protection the shut-in time when, the first ON time Detector unit 100 and the first turn-off time detector unit 102 all export high level, now, when the first displacement control unit 101 When second end is overturn as low level by high level, the first displacement control unit output high level, cycle counter 11 is circulated Displacement.

As this utility model one embodiment, second time electro-detection module 16 includes：Second ON time detector unit 160th, the second turn-off time detector unit 162 and the second displacement control unit 161.

The input of the second ON time detector unit 160, the input and second of the second turn-off time detector unit 162 Second input of displacement control unit 161 connects the test side as second time electro-detection module 16, the second ON time inspection altogether Survey the outfan of unit 160 and the first turn-off time detect the outfan of end unit 102 respectively with the second displacement control unit 161 First input end and the 3rd input connect, the outfan of the second displacement control unit 161 is second time electro-detection module 16 Outfan.

When ON time second switch pipe 41 is detected reaches default maximum ON time, the second ON time detection Unit 160 exports high level signal to the first input end of the second displacement control unit 161；When second switch pipe 41 is detected When turn-off time is less than the preset overpressure protection shut-in time, the second turn-off time detector unit 162 output high level is to the second shifting 3rd input of position control unit 161；When the first input end of the second displacement control unit 161 is high level and the second displacement Second input of control unit 161 from high level be changed into low level when, the second displacement control unit 161 output shift control letter Number.

In this utility model embodiment, when warm light LED control circuit 4 normal work, (i.e. second switch pipe 41 is normally led Logical and turn off) when, the second ON time detector unit 160 and the second turn-off time detector unit 162 all export low level signal, To cycle counter 11, cycle counter 11 does not shift now the second displacement control unit 161 output low level signal.Specifically , when LED constant current driving chip 1 drives warm light LED control circuit 4 work, the second ON time detector unit 160 and second Turn-off time detector unit 162 detects ON time and the turn-off time of second switch pipe 41 respectively, when second switch pipe 41 just Often (ON time of second switch pipe 41 is less than default maximum ON time to turn-on and turn-off and the turn-off time is not less than and preset The pressure protection shut-in time) when, the second ON time detector unit 160 and the first turn-off time detector unit 101 all export low electricity Flat, now the second displacement control unit 161 output low level signal, cycle counter 11 does not shift, and when the second ON time The ON time that detector unit 160 detects second switch pipe 41 reaches default maximum ON time, and the inspection of the second turn-off time Survey unit 162 detect second switch pipe 41 turn-off time be less than preset overpressure protection the shut-in time when, the second ON time Detector unit 160 and the second turn-off time detector unit 162 all export high level, now, when the second displacement control unit 161 When second end is overturn as low level by high level, the first displacement control unit output high level, cycle counter 11 is circulated Displacement.

As this utility model one embodiment, the first constant-current driven module 14 includes the first control unit 140, first and demagnetizes Detector unit 141, the first crest voltage detector unit 142 and the 3rd switching tube 143, the first control of the first control unit 140 End, the second control end and the 3rd control end are respectively the first control end of the first constant-current driven module 14, the second control end and the Three control ends, the unlatching control end of the first control unit 140 and shutoff control end are defeated with the first demagnetization detector unit 141 respectively Go out end and the outfan of the first crest voltage detector unit 142 connects, the input of the first demagnetization detector unit 141, the first control The input of the outfan of unit 140 processed and the first crest voltage detector unit 142 high potential with the 3rd switching tube 143 respectively End, control end and cold end connect, and the outfan of the first control unit 140 is the drive control of the first constant-current driven module 14 End.

In actual applications, the first crest voltage detector unit 142 also external first crest voltage detection resistance RCS1 First end, and the second end ground connection (as shown in Figure 6) of the first crest voltage detection resistance RCS1；The control end of first switch pipe 31 Meet the supply pin VCC of LED constant current driving chip 1 by the resistance within LED constant current driving chip 1, that is, first switch pipe 31 exists It is in normal open state under normal circumstances；The hot end of first switch pipe 31 is connected with and off switch by the first inductance L1.

In this utility model embodiment, the first demagnetization detector unit 141 detects the cold end of first switch pipe 31 Voltage, when the electric current flowing through the first inductance L1 drops to zero, the voltage of the cold end of first switch pipe 31 declines and produces Mutation, when the voltage of cold end of first switch pipe 31 is detected and declining and produce mutation, the first demagnetization detector unit 141 Output opening control signal controls the 3rd switch to the first control unit 140, the first control unit 140 according to opening control signal Pipe 143 turns on, and then controls first switch pipe 31 to turn on.First crest voltage detector unit 142 detection the first crest voltage inspection The voltage of the first end of measuring resistance RCS1, when first switch pipe 31 turns on, flows through the first crest voltage detection resistance RCS1 Electric current can rise, and therefore, the voltage of the first end of the first crest voltage detection resistance RCS1 can rise, when the first peak value is detected When the voltage of the first end of voltage detection resistances RCS1 rises to pre-set peak value voltage, the first crest voltage detector unit 142 is defeated Go out to turn off control signal to the first control unit 140, the first control unit 140 controls the 3rd switching tube according to turning off control signal 143 shutoffs, and then control first switch pipe 31 to turn off.

In this utility model embodiment, the first demagnetization detector unit 141 adopts the testing circuit with comparator as core, I.e. the voltage of the voltage of the cold end of first switch pipe 31 and the supply pin of LED constant current driving chip 1 is compared by comparator Relatively, when the voltage of the cold end of first switch pipe 31, to drop to less than the voltage of the supply pin of LED constant current driving chip 1 one pre- If during magnitude of voltage, the outfan of comparator overturns as high level by low level, and the first control unit 140 is receiving the first demagnetization During the high level signal of detector unit 141 output, control the 3rd switching tube 143 to turn on, and then control first switch pipe 31 to turn on. Wherein, preset voltage value can be configured according to practical situation, be not limited herein.

First crest voltage detector unit 142 adopts the testing circuit with comparator as core, and that is, comparator is by first peak Threshold voltage detection resistance RCS1 voltage and pre-set peak value voltage are compared, when the first of the first crest voltage detection resistance RCS1 When the voltage at end reaches pre-set peak value voltage, the first crest voltage detector unit 142 exports high level, the first control unit 140 When receiving the high level signal of the first crest voltage detector unit 142 output, the 3rd switching tube 143 is controlled to turn off, and then First switch pipe 31 is controlled to turn off.

First control unit 140 adopts the existing control circuit with logic gates as core.

As this utility model one embodiment, the second constant-current driven module 15 includes the second control unit 150, second and demagnetizes Detector unit 151, the second crest voltage detector unit 152 and the 4th switching tube 153, the first control of the second control unit 150 End, the second control end and the 3rd control end are respectively the first control end of the second constant-current driven module 15, the second control end and the Three control ends, the unlatching control end of the second control unit 150 and shutoff control end are defeated with the second demagnetization detector unit 151 respectively Go out end and the outfan of the second crest voltage detector unit 152 connects, the input of the second demagnetization detector unit 151, the second control The input of the outfan of unit 150 processed and the second crest voltage detector unit 152 high potential with the 4th switching tube 153 respectively End, control end and cold end connect, and the outfan of the second control unit 150 is the drive control of the second constant-current driven module 15 End.

In actual applications, the second crest voltage detector unit 152 also external second crest voltage detection resistance RCS2 First end, and the second end ground connection (as shown in Figure 6) of the second crest voltage detection resistance RCS2；The control end of second switch pipe 41 Meet the supply pin VCC of LED constant current driving chip 1 by the resistance within LED constant current driving chip 1, that is, second switch pipe 41 exists It is in normal open state under normal circumstances；The hot end of second switch pipe 41 is connected with and off switch by the second inductance L2.

In this utility model embodiment, the second demagnetization detector unit 151 detects the cold end of second switch pipe 41 Voltage, when the electric current flowing through the second inductance L1 drops to zero, the voltage of the cold end of second switch pipe 41 declines and produces Mutation, when the voltage of cold end of second switch pipe 41 is detected and declining and produce mutation, the second demagnetization detector unit 151 Output opening control signal controls the 4th switch to the second control unit 150, the second control unit 150 according to opening control signal Pipe 153 turns on, and then controls second switch pipe 41 to turn on.Second crest voltage detector unit 152 detection the second crest voltage inspection The voltage of the first end of measuring resistance RCS2, when second switch pipe 41 turns on, flows through the second crest voltage detection resistance RCS2 Electric current can rise, and therefore, the voltage of the first end of the second crest voltage detection resistance RCS2 also can rise, when the second peak is detected When the voltage of the first end of threshold voltage detection resistance RCS2 rises to pre-set peak value voltage, the second crest voltage detector unit 152 Output turns off control signal to the second control unit 150, and the second control unit 150 controls the 4th switch according to turning off control signal Pipe 153 turns off, and then controls second switch pipe 41 to turn off.

In this utility model embodiment, the second demagnetization detector unit 151 adopts the testing circuit with comparator as core, I.e. the voltage of the voltage of the cold end of second switch pipe 41 and the supply pin of LED constant current driving chip 1 is compared by comparator Relatively, when the voltage of the cold end of second switch pipe 41, to drop to less than the voltage of the supply pin of LED constant current driving chip 1 one pre- If during magnitude of voltage, the outfan of comparator overturns as high level by low level, and the second control unit 150 is receiving the second demagnetization During the high level signal of detector unit 151 output, control the 4th switching tube 153 to turn on, and then control second switch pipe 41 to turn on. Wherein, preset voltage value can be configured according to practical situation, be not limited herein.

Second crest voltage detector unit 152 adopts the testing circuit with comparator as core, and that is, comparator is by the second peak The voltage of the first end of threshold voltage detection resistance RCS2 is compared with pre-set peak value voltage, when the second crest voltage detection resistance When the voltage of the first end of RCS2 reaches pre-set peak value voltage, the second crest voltage detector unit 152 exports high level, the second control Unit 150 processed, when receiving the high level signal of the second crest voltage detector unit 152 output, controls the 4th switching tube 153 Turn off, and then control second switch pipe 41 to turn off.

Second control unit 150 adopts the existing control circuit with logic gates as core.

In the present embodiment, first switch pipe 31 and second switch pipe 41 are high-voltage power pipe, the 3rd switching tube 143 He 4th switching tube 153 is low pressure and low power pipe.

Fig. 4 shows the circuit structure of first time electro-detection module 10 that this utility model embodiment provides, for the ease of Illustrate, illustrate only the part related to this utility model embodiment, details are as follows：

As shown in figure 4, the first ON time detector unit 100 include the first NMOS tube N1, the second NMOS tube N2, first PMOS P1, the second PMOS P2, the first electric capacity C1 and first comparator U1.

Wherein, the grid of the grid of the first NMOS tube N1 and the first PMOS P1 connects altogether as the first ON time detection list The input of unit 100, the grid of the drain electrode of the first NMOS tube N1, the drain electrode of the first PMOS P1 and the second NMOS tube N2 is connected to altogether The grid of the second PMOS P2, the positive pole of the drain electrode of the second NMOS tube N2, the drain electrode of the second PMOS P2 and the first electric capacity C1 is altogether It is connected to the in-phase input end of first comparator U1, the anti-phase input of first comparator U1 terminates the first reference voltage source 1000, the The source electrode of the source electrode of one PMOS P1 and the second PMOS P2 is connected to power supply VCC, the source electrode of the first NMOS tube N1, the 2nd NMOS altogether The negative pole of the source electrode of pipe N2 and the first electric capacity C1 is connected to ground altogether, and the outfan of first comparator U1 is that the first ON time detection is single The outfan of unit 100.

First displacement control unit 101 includes the first rest-set flip-flop U3, the first phase inverter U4 and the first controlling switch S1.

Wherein, set end S of the first rest-set flip-flop U3 and reset terminal R are respectively the first of the first displacement control unit 101 Input and the second input, the input of the first phase inverter U4 and the outfan in-phase output end with the first rest-set flip-flop respectively The control end of Q and the first controlling switch S1 connects, and the first end of the first controlling switch S1 and the second end are respectively the first displacement control 3rd input of unit 101 processed and outfan.

First turn-off time detector unit 102 includes the 5th NMOS tube N5, the first bias current sources IP1, the second electric capacity C2 And the second comparator U2.

Wherein, the grid of the 5th NMOS tube N5 is the input of the first turn-off time detector unit 102, the 5th NMOS tube N5 The current input of drain electrode, the positive pole of the second electric capacity C2 and the second comparator U2 be connected to the of the first bias current sources IP1 altogether One end, anti-phase input termination the second benchmark electricity of the second termination power VCC of the first bias current sources IP1, the second comparator U2 Potential source 1020, the negative pole of the source electrode of the 5th NMOS tube N5 and the second electric capacity C2 is connected to ground altogether, and the outfan of the second comparator U2 is The outfan of the first turn-off time detector unit 102.

In this utility model embodiment, when the control end of the 3rd switching tube 143 is high level, the 3rd switching tube 143 Conducting, first switch pipe 31 turns on, and now, the input of the first ON time detector unit 100, the detection of the first turn-off time are single First 102 input and the second input of the first displacement control unit 101 are high level, the first NMOS tube N1 and second PMOS P2 turns on, and power supply VCC is charged to the first electric capacity C1, because in cold light LED control circuit 3 normal work, the The ON time of one switching tube 31 is not up to default maximum ON time, and therefore, (i.e. first compares the positive pole of the first electric capacity C1 The in-phase input end of device U1) voltage be not more than the first reference voltage source 1000 voltage, therefore, first comparator U1 export Low level, the in-phase input end Q output low level of the first rest-set flip-flop U3, the first phase inverter U4 output high level, the first control Switch S1 is in normally off, and the first displacement control unit 101 exports low level, and cycle counter 11 does not shift, meanwhile, the 5th NMOS tube N5 turns on, and the electric current in the first bias current sources IP1 passes through the 5th NMOS tube N5 flow direction ground, the second comparator U2 output Low level；And when the ON time of first switch pipe 31 reaches default maximum ON time, the electricity of the positive pole of the first electric capacity C1 Pressure exports high level more than the voltage of the first reference voltage source 1000, first comparator U1, and now the first control unit 140 controls 3rd switching tube 143 turns off, and then controls first switch pipe 31 to turn off, the input of the first ON time detector unit 100, the Second input of the input of one turn-off time detector unit 102 and the first displacement control unit 101 is overturn by high level For low level, now, the 5th NMOS tube N5 turns off, and power supply VCC is charged to the second electric capacity C2, and the second comparator U2 output is high Level signal, set end S of the first rest-set flip-flop U3 is high level, and reset terminal R is low level, the homophase of the first rest-set flip-flop U3 Outfan Q exports high level, the first phase inverter U4 output low level, the first controlling switch S1 conducting, the detection of the first turn-off time The high level signal of unit 102 output is transmitted to cycle shift unit 11, cycle shift unit 11 by the first controlling switch S1 It is circulated displacement.

Fig. 5 shows the circuit structure of second time electro-detection module 16 that this utility model embodiment provides, for the ease of Illustrate, illustrate only the part related to this utility model embodiment, details are as follows：

As shown in figure 5, the second ON time detector unit 160 include the 3rd NMOS tube N3, the 4th NMOS tube N4, the 3rd PMOS P3, the 4th PMOS P4, the 3rd electric capacity C3 and the 3rd comparator U5.

Wherein, the grid of the 3rd NMOS tube N3 and the grid of the 3rd PMOS P3 connect altogether as the second ON time detection list The input of unit 160, the drain electrode of the 3rd NMOS tube N3, the drain electrode of the 3rd PMOS P3 and the grid of the 4th NMOS tube N4 are connected to altogether The grid of the 4th PMOS P4, the positive pole of the drain electrode, the drain electrode of the 4th PMOS P4 and the 3rd electric capacity C3 of the 4th NMOS tube N4 is altogether It is connected to the in-phase input end of the 3rd comparator U5, the anti-phase input of the 3rd comparator U5 terminates the first reference voltage source 1000, the The source electrode of the source electrode of three PMOS P3 and the 4th PMOS P4 is connected to power supply VCC, the source electrode of the 3rd NMOS tube N3, the 4th NMOS altogether The negative pole of the source electrode of pipe N4 and the 3rd electric capacity C3 is connected to ground altogether, and the outfan of the 3rd comparator U5 is that the second ON time detection is single The outfan of unit 160.

Second displacement control unit 161 includes the second rest-set flip-flop U7, the second phase inverter U8 and the second controlling switch S2.

Wherein, set end S of the second rest-set flip-flop U7 and reset terminal R are respectively the first of the second displacement control unit 161 Input and the second input, the input of the second phase inverter U8 and the outfan in-phase output end with the first rest-set flip-flop respectively The control end of Q and the second controlling switch S2 connects, and the first end of the second controlling switch S2 and the second end are respectively the second displacement control 3rd input of unit 161 processed and outfan.

Second turn-off time detector unit 162 includes the 6th NMOS tube N6, the second bias current sources IP2, the 4th electric capacity C4 And the 4th comparator U6.

Wherein, the grid of the 6th NMOS tube N6 is the input of the second turn-off time detector unit 162, the 6th NMOS tube N6 The current input of drain electrode, the positive pole of the 4th electric capacity C4 and the 4th comparator U6 be connected to the of the second bias current sources IP2 altogether One end, anti-phase input termination the second benchmark electricity of the second termination power VCC of the second bias current sources IP2, the 4th comparator U6 Potential source 1020, the source electrode of the 6th NMOS tube N6 and the negative pole of the 4th electric capacity C4 are connected to ground altogether, and the outfan of the 4th comparator U6 is The outfan of the second turn-off time detector unit 162.

In this utility model embodiment, when the control end of the 4th switching tube 153 is high level, the 4th switching tube 153 Conducting, second switch pipe 41 turns on, and now, the input of the second ON time detector unit 160, the detection of the second turn-off time are single First 162 input and the second input of the second displacement control unit 161 are high level, the 3rd NMOS tube N3 and the 4th PMOS P4 turns on, and power supply VCC is charged to the 3rd electric capacity C3, because in warm light LED control circuit 4 normal work, the The ON time of two switching tubes 41 is not up to default maximum ON time, and therefore, (i.e. the 3rd compares the positive pole of the 3rd electric capacity C3 The in-phase input end of device U5) voltage be not more than the first reference voltage source 1000 voltage, therefore, the 3rd comparator U5 output Low level, the in-phase input end Q output low level of the second rest-set flip-flop U7, the second phase inverter U8 output high level, the second control Switch S2 is in normally off, and the second displacement control unit 161 exports low level, and cycle counter 11 does not shift, meanwhile, the 6th NMOS tube N6 turns on, and the electric current in the second bias current sources IP2 passes through the 6th NMOS tube N6 flow direction ground, the 4th comparator U6 output Low level signal；And when the ON time of second switch pipe 41 reaches default maximum ON time, the positive pole of the 3rd electric capacity C3 Voltage be more than the first reference voltage source 1000 voltage, the 3rd comparator U5 output high level, now the second control unit 150 Control the 4th switching tube 153 to turn off, and then control second switch pipe 41 to turn off, the input of the second ON time detector unit 160 Second input of end, the input of the second turn-off time detector unit 162 and the second displacement control unit 161 is by high level Overturn as low level, now, the 6th NMOS tube N6 turns off, and power supply VCC is charged to the 4th electric capacity C4, and the 4th comparator U6 is defeated Go out high level signal, set end S of the second rest-set flip-flop U7 is high level, and reset terminal R is low level, the second rest-set flip-flop U7's In-phase output end Q exports high level, the second phase inverter U8 output low level, the second controlling switch S2 conducting, the second turn-off time The high level signal of detector unit 162 output is transmitted to cycle shift unit 11, cyclic shift list by the second controlling switch S2 Unit 11 is circulated displacement.

This utility model embodiment additionally provides a kind of LED constant current driving means, and Fig. 6 shows this utility model embodiment The circuit structure of the LED constant current driving means providing, for convenience of description, illustrate only related to this utility model embodiment Part, details are as follows：

A kind of LED constant current driving means, are connected with cold light LED lamp string 5 and warm light LED string 6, LED constant current driving means Including on and off switch 2, rectification module 7, the first bus capacitor C1, cold light LED control circuit 3 and warm light LED control circuit 4, LED Constant current driving device also includes above-mentioned LED constant current driving chip.

Wherein, the first end of on and off switch 2 and the second end connect alternating current power supply 8 and the input of rectification module 7, rectification respectively The supply pin VCC of the first output termination LED constant current driving chip 1 of module 7, the second outfan of rectification module 7, cold light LED The input of lamp string 5, the first control end of cold light LED control circuit 3, the input of warm light LED string 6, warm light LED control electricity First control end on road 4 is connected to the positive pole of the first bus capacitor C1, the minus earth of the first bus capacitor C1, cold light LED control altogether Second control end of the second control end of circuit 3 processed and warm light LED control circuit 4 connect respectively cold light LED lamp string 5 outfan and The outfan of warm light LED string 6.

Cold light LED control circuit 3 include first switch pipe 31, the first load capacitance C1L, the first load resistance R1L, first Inductance L1, the first sustained diode 1 and the first crest voltage detection resistance RCS1；Warm light LED control circuit 4 includes second and opens Close pipe 41, the second load capacitance C2L, the second load resistance R2L, the second inductance L2, the second sustained diode 2 and the second peak value Voltage detection resistances RCS2.

Wherein, the positive pole of the first load capacitance C1L, the first end of the first load resistance R1L and the first sustained diode 1 Negative electrode connect the first control end as cold light LED control circuit 3, the negative pole of the first load capacitance C1L, the first load resistance altogether The first end of second end of R1 and the first inductance L1 meets the second control end as cold light LED control circuit 3, the first inductance L1 altogether The anode of the second end and the first sustained diode 1 be connected to the hot end of first switch pipe 31, the control of first switch pipe 31 altogether End processed and cold end control foot GATE1 and the first source electrode to control foot OUT1 with the first grid of LED constant current driving chip 1 respectively Connect, the first end of the first crest voltage detection resistance RCS1 detects foot with the first crest voltage of LED constant current driving chip 1 CS1 connects, the second end ground connection of the first crest voltage detection resistance RCS1；The positive pole of the second load capacitance C2L, the second load electricity The negative electrode of the first end of resistance R2L and the second sustained diode 2 connects the first control end as warm light LED control circuit 4 altogether, the The first end of the negative pole of two load capacitances C2L, second end of the second load resistance R2L and the second inductance L2 connects altogether as warm light Second control end of LED control circuit 4, second end of the second inductance L2 is connected to second altogether with the anode of the second sustained diode 2 The hot end of switching tube 41, the control end of the second switch pipe 41 and cold end second grid with LED drive chip 1 respectively Foot GATE2 and the second source electrode is controlled to control foot OUT2 connection, the first end of the second crest voltage detection resistance RCS2 and LED constant current Second crest voltage detection foot CS2 of driving chip 1 connects, the second end ground connection of the second crest voltage detection resistance RCS2.

As this utility model one embodiment, first switch pipe 31 is NMOS tube M1, and the grid of NMOS tube M1 is opened for first Close the control end of pipe 31, the drain electrode of NMOS tube M1 is the hot end of first switch pipe 31, the source electrode of NMOS tube M1 is opened for first Close the cold end of pipe 31.

As this utility model one embodiment, second switch pipe 41 is NMOS tube M2, and the grid of NMOS tube M2 is opened for second Close the control end of pipe 41, the drain electrode of NMOS tube M2 is the hot end of second switch pipe 41, the source electrode of NMOS tube M2 is opened for second Close the cold end of pipe 41.

As this utility model one embodiment, rectification module 7 includes rectifier bridge 70, starts resistance RST and start-up capacitance CS. The input of rectifier bridge 70 is the input of rectification module 7, and the outfan of rectifier bridge 70 is connect altogether with the first end starting resistance RST As the second outfan of rectification module 7, the positive pole at the second end and start-up capacitance CS that start resistance RST connects altogether as rectification mould First outfan of block 7, the minus earth of start-up capacitance CS.

As this utility model one embodiment, cold light LED control circuit 3 also includes the first overvoltage protection resistance ROVP1, warms up Light LED control circuit 4 also includes the second overvoltage protection resistance ROVP2.

Wherein, the first end difference of the first end of the first overvoltage protection resistance ROVP1 and the second overvoltage protection resistance ROVP2 It is connected with the first overvoltage protection foot OVP1 and the second overvoltage protection foot OVP2 of LED constant current driving chip 1, the first overvoltage protection electricity Second end of second end of resistance ROVP1 and the second overvoltage protection resistance ROVP2 is all grounded.

In this utility model embodiment, the Schema control foot MODE of LED constant current driving chip and lower margin GND are connected to altogether Ground.

This utility model embodiment additionally provides a kind of LED, including cold light LED lamp string 5 and warm light LED string 6, LED Lamp also includes above-mentioned LED constant current driving means.

Below in conjunction with operation principle, the LED constant current driving means that this utility model embodiment is provided are described further：

In this utility model embodiment, LED constant current driving chip 1 passes through to control first switch pipe 31 and/or second to open The on or off closing pipe 41 to carry out current constant control to cold light LED lamp string and/or warm light LED string.Core is driven with LED constant current As a example piece 1 carries out current constant control to cold light LED lamp string, when electricity on and off switch 2, first switch pipe 31 turns on, now, first Inductance L1 carries out energy storage, when the first crest voltage detector unit 142 detects the first end of the first crest voltage detection resistance When voltage rises to pre-set peak value voltage (electric current of corresponding first inductance L1 rises to its peak point current), the first crest voltage inspection Survey unit 142 output and turn off control signal to the first control unit 140, the first control unit 140 is according to shutoff control signal control Make the 3rd switching tube 143 to turn off, and then control first switch pipe 31 to turn off；When first switch pipe 31 turns off, the first inductance L1 The electric energy of upper storage passes through the first sustained diode 1 for cold light LED lamp statements based on collusion electricity, when the first demagnetization detector unit 141 detects When the voltage of the cold end of first switch pipe 31 drops to and produces mutation, control is opened in the first demagnetization detector unit 141 output Signal processed controls the 3rd switching tube 143 to turn on to the first control unit 140, the first control unit 140 according to opening control signal, And then control first switch pipe 31 to turn on.LED constant current driving chip 1 by control first switch pipe 31 turn-on and turn-off come for Cold light LED lamp string 5 provides stable electric current.

In cold light LED control circuit 3 normal work, the ON time of first switch pipe 31 is：

The turn-off time of first switch pipe 31 is：

Wherein, L is the sensibility reciprocal of the first inductance L1, V_INFor the voltage of the first bus capacitor C1, V_LEDFor cold light LED lamp string two The voltage difference at end, I_PKPeak point current for the first inductance L1.

When 2 times electricity of on and off switch, the voltage V of the first bus capacitor C1_INDecline, due to the electricity at cold light LED lamp string two ends Pressure reduction V_LED, the first inductance L1 sensibility reciprocal L and the first inductance L1 peak point current I_PKWill not change immediately, therefore first opens Close the ON time T of pipe 31_ONCan increase, as the ON time T of first switch pipe 31_ONWhen reaching default maximum ON time, the One control unit 140 can control first switch pipe 31 to turn off, now the peak point current I of the first inductance L1_PKCan not reach and set in advance The value put, that is, with the voltage V of the first bus capacitor C1_INDecline, the peak point current I of the first inductance L1_PKIt is gradually reduced, this Sample can lead to the turn-off time T of first switch pipe 31_OFFIt is gradually reduced, as the turn-off time T of first switch pipe 31_OFFLess than default The overvoltage protection of system during the overvoltage protection shut-in time, can be triggered.And when cold light LED control circuit 3 normal work, due to The voltage V of one bus capacitor C1_INSufficiently high, the peak point current I of the first inductance L1_PKWill not decline, if now first switch The turn-off time T of pipe 31_OFFDiminish, be because voltage difference V at cold light LED lamp string 5 two ends_LEDIncrease, when 5 liang of cold light LED lamp string Voltage difference V at end_LEDDuring more than preset overpressure protection voltage, the overvoltage protection of system can be triggered.Therefore, control electricity in cold light LED If triggering the overvoltage protection of system in the case of the normal work of road 3, it is because voltage difference V at cold light LED lamp string 5 two ends_LEDCross Greatly, trigger the overvoltage protection of system in the case that the ON time of first switch pipe 31 reaches default maximum ON time, Then it is considered 2 times electricity of on and off switch, can achieve the accurate detection to 2 times electric number of times of on and off switch by the way, and be not required to To increase extra reverse-filling diode between rectifier bridge 70 and the first bus capacitor C1, to simplify LED constant current driving means Circuit structure.

It should be noted that in this utility model embodiment, cold light LED control circuit 3 and warm light LED control circuit 4 Operation principle is identical, and accordingly, with respect to the operation principle of warm light LED control circuit 4, here is omitted.

When on and off switch 2 goes up electricity for the first time, cycle counter 11 resets, and exports " 0 " to coding and decoding module 12, encodes " 0 " is converted to first state control signal S1 by decoding module 12, and by first state control signal S1 from its first outfan Export to the first constant-current driven module 14, the first constant-current driven module 14 drives cold light LED control circuit 3 so as to control cold light LED string lights；When on and off switch 2 lower electricity for the first time, lower electro-detection module 10 exports high level signal to cycle counter 11, Cycle counter 11 carries out shifting for the first time, and exports " 1 " to coding and decoding module 12, and " 1 " is changed by coding and decoding module 12 For the second state control signal S2, and the second state control signal S2 is stored, when electricity on second of on and off switch 2, Second state control signal S2 is exported to the second constant-current driven module 15 by coding and decoding module 12 from its second outfan, and second Constant-current driven module 15 drives warm light LED control circuit so as to control warm light LED string to light；In the same manner, when on and off switch 2 During second, cycle counter 11 carries out second displacement, and exports " 2 " to coding and decoding module 12, coding and decoding module " 2 " are converted to third state control signal S3 by 12, and on and off switch 2 third time during electricity, from the output of its 3rd outfan Third state control signal S3 is to the first constant-current driven module 14 and the second constant-current driven module 15, the first constant-current driven module 14 Simultaneously drive cold light LED control circuit 3 and warm light LED control circuit 4 with the second constant-current driven module 15 so as to control cold light LED string and warm light LED string light simultaneously, to realize the purpose of colour temperature regulation.When the lower electricity of on and off switch third time, circulation Enumerator 11 carries out third time and shifts, and exports " 3 " to coding and decoding module 12, and " 3 " are converted to the by coding and decoding module 12 Four state control signal S4, and on and off switch 2 the 4th time during electricity, export the 4th state control signal from its 4th outfan To pulse width modulation module 13, pulse width modulation module 13, when receiving the 4th state control signal S4, exports a frequency and accounts for S4 Sky compares all fixing pulsewidth modulation square-wave signal to the first constant-current driven module 14 and the second constant-current driven module 15, the first constant current Drive module 14 and the second constant-current driven module 15 drive cold light LED control circuit 3 and warm light LED to control with predetermined current respectively Circuit 4, so that it controls cold light LED lamp string and warm light LED string to light with predetermined luminance respectively, and then realizes brightness regulation Purpose.

Wherein, the frequency of pulsewidth modulation square-wave signal and dutycycle can be configured according to the actual requirements, do not limit herein System, the dutycycle that for example can arrange pulsewidth modulation square-wave signal is 50%.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all this Any modification, equivalent and improvement made within the spirit of utility model and principle etc., should be included in this utility model Protection domain within.

Claims

1. in the first switch pipe and warm light LED control circuit in a kind of LED constant current driving chip, with cold light LED control circuit Second switch pipe connect, described LED constant current driving chip passes through to control described first switch pipe and/or described second switch pipe Break-make so that current constant control, described cold light LED control circuit are carried out to described cold light LED lamp string and/or described warm light LED string With described warm light LED control circuit under the control of on and off switch, respectively color is executed to cold light LED lamp string and warm light LED string Temperature is adjusted and brightness regulation is it is characterised in that described LED constant current driving chip includes：First time electro-detection module, second time electricity Detection module, cycle counter, coding and decoding module, pulse width modulation module, the first constant-current driven module and the second constant-current driving Module；

The test side of the test side of described first time electro-detection module and described second time electro-detection module is respectively with described first The drive control end of the drive control end of constant-current driven module and described second constant-current driven module connects, described cycle counter The first control end, the second control end and outfan respectively with the outfan of described first time electro-detection module, described second under The input of the outfan of electro-detection module and described coding and decoding module connects, the first output of described coding and decoding module End, the second outfan and the first control end, described second constant current with described first constant-current driven module respectively of the 4th outfan The control end of the first control end of drive module and described pulse width modulation module connects, the 3rd output of described coding and decoding module End is connected with the second control end of described first constant-current driven module and the second control end of described second constant-current driven module, institute State the outfan of pulse width modulation module and the 3rd control end of described first constant-current driven module and described second constant-current driving mould 3rd control end of block connects, the test side of the test side of described first constant-current driven module and described second constant-current driven module It is connected with the cold end of described first switch pipe and the cold end of described second switch pipe respectively；

Described first time electro-detection module detects ON time and the turn-off time of described first switch pipe, described when detecting The ON time of first switch pipe reaches default maximum ON time, and the turn-off time of described first switch pipe is less than and preset During the pressure protection shut-in time, described first time electro-detection module judges electric under described on and off switch and exports shift control signal； Described second time electro-detection module detects ON time and the turn-off time of described second switch pipe, opens when detecting described second The ON time closing pipe reaches default maximum ON time, and the turn-off time of described second switch pipe is less than preset overpressure and protects During the shut-in time, described second time electro-detection module judges electric under described on and off switch and exports shift control signal；Described follow Inner loop counter is circulated according to described shift control signal and shifts and export shift result；Described coding and decoding module will be described Shift result is converted to corresponding state control signal, and when described on and off switch goes up electricity again, is controlled according to described state Signal controls described first constant-current driven module and/or described second constant-current driven module to drive described cold light LED control circuit And/or the described colour temperature of described warm light LED control circuit execution is adjusted；Described pulse width modulation module is receiving described coding and decoding During the state control signal of module output, described first constant-current driven module and described the are controlled according to described state control signal Two constant-current driven modules make described cold light LED control circuit and described warm light LED control circuit control institute with predetermined current respectively State cold light LED lamp string and described warm light LED string to light according to predetermined luminance.

2. LED constant current driving chip as claimed in claim 1 is it is characterised in that described first time electro-detection module includes：The One ON time detector unit, the first turn-off time detector unit and the first displacement control unit；

The input of described first ON time detector unit, the input of described first turn-off time detector unit and described Second input of one displacement control unit connects the test side as described first time electro-detection module altogether, during described first conducting Between detector unit outfan and described first the turn-off time detect end unit outfan respectively with described first shift control The first input end of unit and the 3rd input connect, and the outfan of described first displacement control unit is described first time electric-examination Survey the outfan of module；

When the ON time described first switch pipe is detected reaches described default maximum ON time, during described first conducting Between detector unit export high level signal to described first displacement control unit first input end；Open when detecting described first When the turn-off time closing pipe is less than the described preset overpressure protection shut-in time, described first turn-off time detector unit output height electricity Put down to the 3rd input of described first displacement control unit；When the first input end of described first displacement control unit is high electricity Flat and the second input from high level be changed into low level when, described first displacement control unit output shift control signal.

3. LED constant current driving chip as claimed in claim 2 is it is characterised in that described first ON time detector unit bag Include the first NMOS tube, the second NMOS tube, the first PMOS, the second PMOS, the first electric capacity and first comparator；

The grid of the grid of described first NMOS tube and described first PMOS connects single as described first ON time detection altogether The input of unit, the grid of the drain electrode of described first NMOS tube, the drain electrode of described first PMOS and described second NMOS tube is altogether It is connected to the grid of described second PMOS, the drain electrode of described second NMOS tube, the drain electrode of described second PMOS and described first The positive pole of electric capacity is connected to the in-phase input end of described first comparator altogether, and the anti-phase input of described first comparator terminates the first base Reference voltage source, the source electrode of the source electrode of described first PMOS and described second PMOS is connected to power supply altogether, described first NMOS tube Source electrode, the source electrode of described second NMOS tube and described first electric capacity negative pole be connected to altogether ground, the output of described first comparator Hold the outfan for described first ON time detector unit.

4. LED constant current driving chip as claimed in claim 2 is it is characterised in that described first displacement control unit includes One rest-set flip-flop, the first phase inverter and the first controlling switch；

The set end of described first rest-set flip-flop and reset terminal be respectively described first displacement control unit first input end and Second input, the input of the described first phase inverter and outfan in-phase output end with described first rest-set flip-flop respectively Connect with the control end of described first controlling switch, the first end of described first controlling switch and the second end are respectively described first 3rd input of displacement control unit and outfan.

5. LED constant current driving chip as claimed in claim 2 is it is characterised in that described first turn-off time detector unit bag Include the 5th NMOS tube, the first bias current sources, the second electric capacity and the second comparator；

The grid of described 5th NMOS tube is the input of described first turn-off time detector unit, the leakage of described 5th NMOS tube The in-phase input end of pole, the positive pole of described second electric capacity and described second comparator is connected to the of described first bias current sources altogether One end, the second termination power of described first bias current sources, anti-phase input termination the second benchmark electricity of described second comparator Potential source, the source electrode of described 5th NMOS tube and the negative pole of described second electric capacity are connected to ground, the outfan of described second comparator altogether Outfan for described first turn-off time detector unit.

6. LED constant current driving chip as claimed in claim 1 is it is characterised in that described second time electro-detection module includes：The Two ON time detector units, the second turn-off time detector unit and the second displacement control unit；

The input of described second ON time detector unit, the input of described second turn-off time detector unit and described Second input of two displacement control unit connects the test side as described second time electro-detection module altogether, during described second conducting Between detector unit outfan and described second the turn-off time detect end unit outfan respectively with described second shift control The first input end of unit and the 3rd input connect, and the outfan of described second displacement control unit is described second time electric-examination Survey the outfan of module；

When the ON time described second switch pipe is detected reaches described default maximum ON time, during described second conducting Between detector unit export high level signal to described second displacement control unit first input end；When detecting described second When the turn-off time of switching tube is less than the described preset overpressure protection shut-in time, described second turn-off time detector unit output is high 3rd input of level extremely described second displacement control unit；When the first input end of described second displacement control unit is height Level and the second input from high level be changed into low level when, described second displacement control unit output shift control signal.

7. a kind of LED constant current driving means, are connect with cold light LED lamp string and warm light LED series winding, described LED constant current driving means Including on and off switch, rectification module, the first bus capacitor, cold light LED control circuit and warm light LED control circuit, its feature exists In described LED constant current driving means also include the LED constant current driving chip as described in claim 1-6 any one；

The first end of described on and off switch and the second end connect the outfan of alternating current power supply and the input of described rectification module respectively, First output of described rectification module terminates the supply pin of described LED constant current driving chip, the second output of described rectification module End, the input of described cold light LED lamp string, the first control end of described cold light LED control circuit, described warm light LED string Input, the first control end of described warm light LED control circuit are connected to the positive pole of described first bus capacitor altogether, and described first is female Second control of the minus earth of line capacitance, the second control end of described cold light LED control circuit and described warm light LED control circuit End processed connects the outfan of described cold light LED lamp string and the outfan of described warm light LED string respectively；

Described cold light LED control circuit include first switch pipe, the first load capacitance, the first load resistance, the first inductance, first Fly-wheel diode and the first crest voltage detection resistance；Described warm light LED control circuit includes second switch pipe, the second load electricity Appearance, the second load resistance, the second inductance, the second fly-wheel diode and the second crest voltage detection resistance；

The negative electrode of the positive pole of described first load capacitance, the first end of described first load resistance and described first fly-wheel diode Connect the first control end as described cold light LED control circuit, the negative pole of described first load capacitance, described first load altogether The first end of the second end of resistance and described first inductance meets the second control end as described cold light LED control circuit, institute altogether The anode at the second end and described first fly-wheel diode of stating the first inductance is connected to the hot end of described first switch pipe, institute altogether State the control end of first switch pipe and cold end controls foot and first with the first grid of described LED constant current driving chip respectively Source electrode controls foot connection, the first end of described first crest voltage detection resistance and the first peak of described LED constant current driving chip Threshold voltage detection foot connects, the second end ground connection of described first crest voltage detection resistance；The positive pole of described second load capacitance, The negative electrode of the first end of described second load resistance and described second fly-wheel diode connects altogether as described warm light LED control circuit The first control end, the negative pole of described second load capacitance, the second end of described second load resistance and described second inductance First end connects the second control end as described warm light LED control circuit, the second end of described second inductance and described second altogether The anode of fly-wheel diode is connected to the hot end of described second switch pipe, the control end of described second switch pipe and electronegative potential altogether End controls foot and the second source electrode to control foot to be connected respectively with the second grid of described LED constant current driving chip, described second peak value The first end of voltage detection resistances is connected with the second crest voltage detection foot of described LED constant current driving chip, described second peak Second end ground connection of threshold voltage detection resistance.

8. LED constant current driving means as claimed in claim 7 are it is characterised in that described rectification module includes rectifier bridge, startup Resistance and start-up capacitance；

The input of described rectifier bridge is the input of described rectification module, the outfan of described rectifier bridge and described startup resistance First end connect the second outfan as described rectification module, the second end of described startup resistance and described start-up capacitance altogether Positive pole connects the first outfan as described rectification module, the minus earth of described start-up capacitance altogether.

9. LED constant current driving means as claimed in claim 7 are it is characterised in that described cold light LED control circuit also includes First overvoltage protection resistance, described warm light LED control circuit also includes the second overvoltage protection resistance；

The first end of the first end of described first overvoltage protection resistance and described second overvoltage protection resistance is permanent with described LED respectively Stream the first overvoltage protection foot of driving chip and the second overvoltage protection foot connect, the second end of described first overvoltage protection resistance and Second end of described second overvoltage protection resistance is all grounded.

10. a kind of LED, including cold light LED lamp string and warm light LED string it is characterised in that described LED is also included as power Profit requires the LED constant current driving means described in 7-9 any one.