CN109348582A - A four-channel AC LED driver chip circuit with fine dimming - Google Patents
A four-channel AC LED driver chip circuit with fine dimming Download PDFInfo
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- CN109348582A CN109348582A CN201811442430.3A CN201811442430A CN109348582A CN 109348582 A CN109348582 A CN 109348582A CN 201811442430 A CN201811442430 A CN 201811442430A CN 109348582 A CN109348582 A CN 109348582A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
本发明公开了一种精细调光的四通道AC LED驱动芯片电路，将市电进行全波整流后的脉动电压同时驱动WLED、RLED、GLED及BLED灯串，通过逻辑控制电路产生的控制信号、PWM电路产生的调光信号及保护电路产生的保护信号实现各颜色通道灯串的分段导通及亮度调节。本发明无须进行AC‑DC转换，减小了系统体积，降低了制造成本，提高了系统可靠性；本发明通过调光电路和不同占空比的PWM信号对不同颜色通道进行精细调光相结合以实现设计参数的彩色驱动，同时可调节光谱分布，进一步提高照明效率，从而应用于多样化的照明用途；本发明可调整因各颜色灯串电流值变化而导致的色偏问题；同时可提高LED灯串的显色指数，使得系统整体显色性能更好。
The invention discloses a four-channel AC LED driving chip circuit with fine dimming, which simultaneously drives WLED, RLED, GLED and BLED light strings with the pulsating voltage after full-wave rectification of the commercial power supply. The control signal generated by the logic control circuit, The dimming signal generated by the PWM circuit and the protection signal generated by the protection circuit realize segmented conduction and brightness adjustment of the light strings of each color channel. The present invention does not need to perform AC-DC conversion, reduces system volume, reduces manufacturing cost, and improves system reliability; the present invention combines fine dimming for different color channels through a dimming circuit and PWM signals with different duty ratios In order to realize the color driving of the design parameters, the spectral distribution can be adjusted at the same time, and the lighting efficiency can be further improved, so that it can be applied to a variety of lighting purposes; the invention can adjust the color shift problem caused by the change of the current value of each color light string; at the same time, it can improve the The color rendering index of the LED light string makes the overall color rendering performance of the system better.
Description
Technical field
The present invention relates to driving circuit fields, more particularly to a kind of four-way AC LED drive chip electricity finely dimmed
Road.
Background technique
Recently as science and technology development, LED as green, energy conservation, power saving, the forth generation illuminator of long-life and it is different
Army's protrusion.And LED has the advantage that it is just made gradually to replace incandescent lamp and fluorescent lamp, is widely used in various lighting areas,
Receive the research energetically of national governments.
Traditional LED drive circuit mostly uses direct current driven, i.e., after being handled using AC-DC converter alternating current
DC voltage is exported, then drives LED again.But since there is biggish energy losses in conversion process, reduce LED system
System efficiency.The service life of AC-DC converter is far below the service life of LED simultaneously, seriously affects the reliability of driving circuit.
With advances in technology, the technology of directly driven by AC LED (AC LED) starts to be developed and use.The technology is big
Cause that two classes can be divided into: bridge-type AC LED technology drives the driving chip technology of HV-LED with exchanging.Bridge-type AC LED technology is
Using the one-way conduction characteristic of LED, LED lamp bead is arranged in similar rectifier bridge structure and is directly connected in alternating current realize friendship
Stream shines；And the technology for exchanging driving HV-LED then uses Discrete control and constant current processing technique, so that LED is in different input electricity
Pressure realizes that segmentation is lighted or extinguished, and improves the efficiency of system.
However, the progress of technology, the raising of quality of life and it is energy-efficient it is required that colored RGB driving application range
Also increasingly wider, such as illumination, landscape and agricultural field.LED applied to fields such as illuminations is in addition to colour temperature and development index etc.
Outside important parameter, industry also increasingly payes attention to the S/P ratio (S: half-light brightness, P: highlight brightness) of spectrum.Studies have shown that having
The light bulb of higher S/P ratio can make full use of human eye nerve cell susceptibility reduce illuminance requirement come protect eyes and
Meet the visual effect being more clear, while further saving the energy.Multichannel directly driven by AC LED scheme uses at present
It is colored driving to be realized by changing the electric current of each color lamp string, but LED light string shines there is certain colour cast.
Summary of the invention
It is an object of the invention to solve big direct current RGB driving circuit volume in the prior art, at high cost, low efficiency and
The problems such as color developing is poor, and multichannel exchange driving LED is overcome to have the defects that colour cast, a kind of four finely dimmed are provided
Channel AC LED drive chip circuit.The present invention has integrated level height, adjustable spatial distribution, color developing more preferable and efficiency
The advantages that high, and there is mild overvoltage protection.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of four-way AC LED drive chip circuit finely dimmed, including rectifier bridge, bleeder circuit, current detecting electricity
Road, logic control circuit, pwm circuit, light modulation and protection circuit, channel current generation circuit, WRGB constant-current circuit, WLED lamp
String, RLED lamp string, GLED lamp string, BLED lamp string and protection circuit；
The WLED lamp string, RLED lamp string, GLED lamp string and BLED lamp string include multi-stage LED；Wherein, first order LED
It is made of the first string LED light string, second level LED is made of two string LED light strings before adjacent, and third level LED goes here and there LED light by first three
String composition, and so on constitute multi-stage LED.
The first order in the rectifier bridge, output end and WLED lamp string, RLED lamp string, GLED lamp string and BLED lamp string
The input terminal of LED is connected；For carrying out full-wave rectification to alternating current；
The bleeder circuit, one end are connected with rectifier bridge, and the other end is connected with logic control circuit；For that will rectify
The high-pressure pulsating voltage of output is depressured, and obtained amplitude is less than the low pressure pulsating volage of chip power voltage in chip
Portion's processing；
The current detection circuit, the injectron in control channel that one end is connected respectively and with WLED lamp string
Source electrode is connected, and the other end is connected with logic control circuit；For detecting the size for flowing through the electric current in the channel WLED, work as detection
Electric current when reaching current threshold, export a pulse signal, the signal as the switching of logic control circuit channel；
The logic control circuit is connected with light modulation and protection circuit；For in input voltage ascent stage, electric current inspection
When slowdown monitoring circuit exports a pulse signal effect logic control circuit, generates and removed in control WLED, RLED, GLED and BLED lamp string
The signal that remaining switching group at different levels outside afterbody LED successively turn off；In the input voltage decline stage, generation control WLED,
The signal that remaining switching group at different levels in RLED, GLED and BLED lamp string in addition to afterbody LED are successively opened；
The pwm circuit is connected with light modulation and protection circuit；For generating and WLED, RLED, GLED and BLED lamp string
In the corresponding control channel of LED at different levels dim signal；
The light modulation and protection circuit, respectively with logic control circuit, pwm circuit, protection circuit and switching gate mould
The grid of metal-oxide-semiconductor is connected in block；The dim signal that control signal, pwm circuit for generating to logic control circuit generate
And protection circuit generate protection signal integrated, then in WLED, RLED, GLED and BLED lamp string remove afterbody
The on-off of remaining switching group at different levels outside LED is controlled, realize WLED, RLED, GLED and BLED lamp string LED at different levels according to
It is secondary to light and successively extinguish；
The channel current generation circuit is connected with the source electrode of metal-oxide-semiconductor in switching gate module；For when RLED,
When the respective channel of GLED and BLED lamp string is opened, electric current is provided for it by channel current generation circuit；
Afterbody LED in the WRGB constant-current circuit, with WLED lamp string, RLED lamp string, GLED lamp string and BLED lamp string
Output end be connected；When WLED, RLED, GLED and BLED lamp string are all lighted, WRGB constant-current circuit keeps afterbody
Electric current on LED output end channel is constant；
The protection circuit, for providing overvoltage protection and overheat protector.
The rectifier bridge is full-wave rectification bridge, and the alternating current of 220V/50Hz is converted to the DC pulse moving voltage of 0-311V.
The current detection circuit includes error amplifier and resistance R1.
In the current detection circuit, when the height of the corresponding control channel of LED output ends at different levels in WLED lamp string presses off
When closing pipe opening, electric current flows through sampling resistor R1 and generates pressure drop, which is connected to error amplifier as feedback signal
In-phase end, the reverse phase of error amplifier terminate reference voltage VREF1, and error amplifier output connects logic control circuit.
The pwm circuit includes comparator.
In the pwm circuit, sawtooth voltage is connected with the reverse input end of comparator, generates the outer of dim signal
Portion's voltage is connected with the noninverting input of comparator respectively, and the size of the external voltage of dim signal is generated by adjusting, can
To obtain the dim signal of the different duty of WLED, RLED, GLED and BLED lamp string corresponding channel.
The light modulation and protection circuit include AND gate circuit.
In the light modulation and protection circuit, the output signal of logic control circuit, the output signal of pwm circuit and guarantor
The output signal of protection circuit is connected respectively and with door input terminal, and output signal controls in WLED, RLED, GLED and BLED lamp string
Remaining switching group at different levels in addition to afterbody LED.
The channel current generation circuit includes error amplifier, metal-oxide-semiconductor and resistance R2.
In the channel current generation circuit, error amplifier, a MOS being connected with error amplifier output
Pipe and resistance R2 form constant-current circuit, and the current mirror to be made of other metal-oxide-semiconductors provides bias current, then give RLED lamp
Its in remaining LED output end corresponding channel at different levels, GLED lamp string in string in addition to afterbody LED in addition to afterbody LED
Remaining LED output end corresponding channel at different levels in remaining LED output end corresponding channel at different levels, BLED lamp string in addition to afterbody LED
Electric current is provided.
The WRGB constant-current circuit includes error amplifier, metal-oxide-semiconductor and resistance.
Further, error amplifier number, resistance number and metal-oxide-semiconductor number and lamp string in the WRGB constant-current circuit
Number of types is identical.
In the WRGB constant-current circuit, when WLED, RLED, GLED and BLED lamp string are all lighted, electric current is through high pressure
Metal-oxide-semiconductor flows to sampling resistor, and pressure drop is generated on sampled voltage, and the voltage value is connected to error amplifier as feedback signal
Inverting input terminal, the homophase input of error amplifier terminates reference voltage VREF1, the output terminated high voltage of error amplifier
The grid of metal-oxide-semiconductor.
Further, in the present invention, lamp string type and not limited in WLED lamp string, RLED lamp string, GLED lamp string,
BLED lamp string these four.
The present invention compared to the prior art, have it is below the utility model has the advantages that
1, the present invention reduces system bulk, reduces manufacturing cost, the system of improving can without carrying out AC-DC conversion
By property.
2, the present invention dims each lamp string using pwm signal, can improve and be dimmed by changing each lamp string stream
And the colour cast problem generated, while the colour rendering index of lamp string can be improved in the addition of lamp string WLED, makes system entirety color developing more
It is good.
3, the present invention can control the duty of each color lamp string dim signal by adjusting according under the conditions of low irradiance
Than the LED light for change spatial distribution, realizing high S/P ratio, the susceptibility of human eye can be preferably utilized, protects eyes and excellent
Change illuminating effect, further increases illumination efficiency.
4, application range of the invention is wider, in addition to general lighting, can also be applied to plant illumination, according to plant not
Its spectrum demand of same growth period is different, can make particular color channel conductive by adjusting pwm circuit, realize and become privileged photograph
It is bright.
5, protection circuit can enable core when chip is more than certain temperature or city's electro-mechanical wave is more than a certain range in the present invention
Piece stops working to protect chip.
Detailed description of the invention
Fig. 1 is that the structure for the four-way AC LED drive chip circuit that one kind provided in an embodiment of the present invention finely dims is shown
It is intended to.
Fig. 2 is the schematic diagram of pwm circuit in the embodiment of the present invention.
Fig. 3 is the schematic diagram for dimming and protecting circuit in the embodiment of the present invention.
Fig. 4 is the schematic diagram of channel current generation circuit in the embodiment of the present invention.
Fig. 5 is the schematic diagram of WRGB constant-current circuit in the embodiment of the present invention.
Fig. 6 be WLED, RLED in a kind of four-way AC LED drive chip circuit finely dimmed in the embodiment of the present invention,
Working waveform figure of GLED, BLED lamp string under different duty dim signal.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
It is as shown in Figure 1 a kind of structural schematic diagram of four-way AC LED drive chip circuit finely dimmed, the electricity
Road includes rectifier bridge (1), bleeder circuit (12), current detection circuit (8), logic control circuit (6), pwm circuit (11), light modulation
And protection circuit (14), channel current generation circuit (9), WRGB constant-current circuit (10), WLED lamp string (2), RLED lamp string (3),
GLED lamp string (4), BLED lamp string (5) and protection circuit (13)；
WLED (white light LEDs) lamp string, RLED (red-light LED) lamp string, GLED (green light LED) lamp string and BLED (blue light
LED) lamp string includes multi-stage LED；Wherein, first order LED is made of the first string LED light string, and second level LED is by before adjacent two
LED light string of going here and there forms, and third level LED is made of first three string LED light string, and fourth stage LED is made of four string LED light strings.
The first order in the rectifier bridge, output end and WLED lamp string, RLED lamp string, GLED lamp string and BLED lamp string
The input terminal of LED is connected；For carrying out full-wave rectification to alternating current；
The bleeder circuit, one end are connected with rectifier bridge, and the other end is connected with logic control circuit；For that will rectify
The high-pressure pulsating voltage of output is depressured, and obtained amplitude is less than the low pressure pulsating volage of chip power voltage in chip
Portion's processing；
The current detection circuit, one end are connect with the source electrode of injectron HM1, HM5, HM9 of control channel 1~3,
The other end is connect with logic control circuit；For detecting the size of current in the channel WLED 1~3, when electric current reaches current threshold
When VREF1/R1, a pulse signal is exported, the signal as the switching of logic control circuit channel.
The logic control circuit is connected with light modulation and protection circuit；For in input voltage ascent stage, electric current inspection
Slowdown monitoring circuit exports a pulse signal effect in logic control circuit, and output signal S1~S12 acts on light modulation and protection circuit；
In the input voltage decline stage, logic control circuit control output signal S1~S12 acts on light modulation and protection circuit；
The pwm circuit is connected with light modulation and protection circuit；For generating and WLED, RLED, GLED and BLED lamp string
In the corresponding control channel of LED at different levels dim signal；
The light modulation and protection circuit, respectively with logic control circuit, pwm circuit, protection circuit and switching gate mould
The grid of block (7) mesohigh metal-oxide-semiconductor HM1~12 is connected；To output signal S1~S12 of logic control circuit, pwm circuit it is defeated
The output signal V_P of P_W out, P_R, P_G, P_B and protection circuit carries out integrated treatment, then output signal SW1~SW12
With the on-off of control switch pipe HM1~12, realize that remaining is at different levels in addition to afterbody LED on WLED, RLED, GLED and BLED
LED is successively lighted and is successively extinguished, while fine light modulation can be realized by the dim signal of different duty, and then realize colored drive
It is dynamic；
The channel current generation circuit, with switching gate module mesohigh metal-oxide-semiconductor HM2~4, HM6~8, HM10~12
Source electrode connection；For working as each channel of RLED, GLED and BLED lamp string, i.e. channel 5~7, channel 9~11, channel 13~15 is opened
Qi Shi provides electric current for it.
Afterbody LED in the WRGB constant-current circuit, with WLED lamp string, RLED lamp string, GLED lamp string and BLED lamp string
Output end be connected；When WLED, RLED, GLED and BLED lamp string are all lighted, it is logical that WRGB constant-current circuit keeps it to correspond to
Road 4, channel 8, channel 12 and the electric current in channel 16 are constant, connect with WLED4, RLED4, GLED4 and BLED4 unit output end.
The protection circuit, for providing overvoltage protection and overheat protector.
The rectifier bridge is full-wave rectification bridge, and the alternating current of 220V/50Hz is converted to the DC pulse moving voltage of 0-311V.
The current detection circuit includes error amplifier and resistance R1, when LED output ends at different levels in WLED lamp string are corresponding
Control channel injectron open when, electric current flow through sampling resistor R1 generate pressure drop, the voltage value is as feedback signal
It is connected to the in-phase end of error amplifier, the reverse phase of error amplifier terminates reference voltage VREF1, and error amplifier output connects
Logic control circuit.
As shown in Fig. 2, the pwm circuit includes four comparators, sawtooth voltage Vsaw respectively with four comparators
Reverse input end is connected, and external voltage V_W, V_R, V_G and the V_B for generating dim signal are in the same direction defeated with comparator respectively
Enter end to be connected, comparator output terminal is connected with the high-voltage switch gear tube grids at different levels on WLED, RLED, GLED and BLED, leads to
Overregulate the size for generating the external voltage of dim signal, the available channel WLED, RLED, GLED and BLED different duty
Dim signal P_W, P_G, P_R and P_B.
As shown in figure 3, the light modulation and protection circuit include 12 AND gate circuits, the output signal of logic control circuit
The output signal V_P of S1~S12, output signal P_W, P_G, P_R, P_B of pwm circuit and protection circuit are respectively and defeated with door
Enter end to be connected, upper remaining is respectively in addition to afterbody LED with control WLED, RLED, GLED and BLED respectively with the output end of door
Grade high-voltage MOS pipe grid is connected, and output signal SW1~SW12 is controlled on WLED, RLED, GLED and BLED respectively except last
Remaining outer high-voltage MOS pipe at different levels of grade LED, realize remaining of WLED, RLED, GLED and BLED lamp string in addition to afterbody LED
LED at different levels are successively lighted and are successively turned off, while fine light modulation can be realized by the dim signal of different duty, and then realize color
Color driving.
As shown in figure 4, the channel current generation circuit includes error amplifier, N-type metal-oxide-semiconductor MN1~11, p-type metal-oxide-semiconductor
MP1~2 and resistance R2.Error amplifier in-phase input end meets reference voltage VREF1, one end of reverse input end and resistance R2 and
The source electrode of metal-oxide-semiconductor MN1 is connected, and output end is connected with the grid of metal-oxide-semiconductor MN1；The drain electrode of metal-oxide-semiconductor MN1 is with metal-oxide-semiconductor MP1's
Grid is connected with the grid of drain electrode and metal-oxide-semiconductor MP2；The source electrode of metal-oxide-semiconductor MP1 and MP2 are connected with VDD；The leakage of metal-oxide-semiconductor MP2
Pole is connected with the grid of the drain and gate of metal-oxide-semiconductor MN2 and metal-oxide-semiconductor MN3~11；The drain electrode of metal-oxide-semiconductor MN3~11 respectively with
High-voltage switch gear group HM2~4, HM6~8, HM10~12 in switching gate module are connected；The other end and metal-oxide-semiconductor of resistance R2
The source electrode of MN2~11 is connected to the ground；Error amplifier, metal-oxide-semiconductor MN1 and resistance R2 composition constant-current circuit generate electric current VREF1/
R2, the current mirror being made up of metal-oxide-semiconductor MP1~2, MN2~11 provide electricity to channel 5~7, channel 9~11, channel 13~15
Stream.
As shown in figure 5, the WRGB constant-current circuit includes error amplifier OP1, OP2, OP3, OP4, high-voltage MOS pipe
HM13, HM14, HM15, HM16, with door AND1, AND2, AND3, AND4, resistance R3, R4, R5 and R6.Error amplifier OP1~4
Non-inverting input terminal meet reference voltage VREF1, the reverse input end of error amplifier OP1 and one end of resistance R3 and high pressure
The source electrode of metal-oxide-semiconductor HM13 is connected, and output end and is connected with an input terminal of door AND1, the output signal P_W of pwm circuit
It is connected with the output signal V_P of protection circuit and with the another two input terminal of door AND1, the output end and high pressure with door AND1
The grid of metal-oxide-semiconductor HM13 is connected, and the drain electrode of high-voltage MOS pipe HM13 is connected with the output end of afterbody LED in WLED lamp string
It connects；The reverse input end of error amplifier OP2 is connected with the source electrode of one end of resistance R4 and high-voltage MOS pipe HM14, output end
Be connected with an input terminal with door AND2, the output signal P_R of pwm circuit and protect circuit output signal V_P and with
The another two input terminal of door AND2 is connected, and is connected with the output end of door AND2 with the grid of high-voltage MOS pipe HM14, high pressure
The drain electrode of metal-oxide-semiconductor HM14 is connected with the output end of afterbody LED in RLED lamp string；The reversed input of error amplifier OP3
End is connected with the source electrode of one end of resistance R5 and high-voltage MOS pipe HM15, output end and is connected with an input terminal of door AND3
It connects, the output signal P_G of pwm circuit and protects the output signal V_P of circuit and be connected with the another two input terminal of door AND3,
It is connected with the output end of door AND3 with the grid of high-voltage MOS pipe HM15, in the drain electrode and GLED lamp string of high-voltage MOS pipe HM15 most
The output end of rear stage LED is connected；The reverse input end of error amplifier OP4 and one end of resistance R6 and high-voltage MOS pipe
The source electrode of HM16 is connected, and output end and is connected with an input terminal of door AND4, the output signal P_B of pwm circuit and guarantor
The output signal V_P of protection circuit and it is connected with the another two input terminal of door AND4, the output end and high-voltage MOS pipe with door AND4
The grid of HM16 is connected, and the drain electrode of high-voltage MOS pipe HM16 is connected with the output end of afterbody LED in BLED lamp string；Electricity
The other end of resistance R3~R6 is connected to the ground；When WLED, RLED, GLED and BLED lamp string are all lighted, electric current is through high pressure
Metal-oxide-semiconductor HM13~16 flow to sampling resistor R3~R6, and pressure drop V1~V4 is generated on sampled voltage, and the voltage value is as anti-
Feedback signal is connected to the reverse input end of error amplifier, in error amplifier OP1~4, high-voltage MOS pipe HM13~16 and resistance R3
Under the collective effect of~R6, keep the electric current for flowing through WLED, RLED, GLED and BLED lamp string constant, while can be by different duty
Dim signal realize fine light modulation, and then realize colored driving.
In the present embodiment, a kind of four-way AC LED drive chip circuit finely dimmed is a pulsating volage period
Interior control flow specifically:
Electric main obtains periodically pulsing voltage HV, direct parallel drive WLED after rectifier circuit full-wave rectification
Lamp string, RLED lamp string, GLED lamp string and BLED lamp string.
Pulsating volage increases since 0, and high-voltage MOS pipe HM1-12 when beginning in switching gate module is in open shape
State, when pulsating volage reaches the cut-in voltage of WLED1, RLED1, GLED1 and BLED1 unit, each lamp string stream passes through respectively
Respective first order LED unit flows to channel 1, channel 5, channel 9 and channel 13, flows to the electric current in channel 5, channel 9, channel 13
IR1, IG1, IB1 are generated by channel current generation circuit, and error amplifier, metal-oxide-semiconductor MN1, MP1 and resistance R2 generate electric current
Then VREF1/R2 provides electricity to channel 5, channel 9 and channel 13 by the current mirror that metal-oxide-semiconductor MP2, MN2 and MN3~5 are constituted
Stream.
As pulsating volage HV is gradually increased, I_WLED is increased rapidly.At the t1 moment, current detection circuit detects I_
WLED reaches given threshold VREF1/R1, output detection signal I_P, and logic control circuit turns off metal-oxide-semiconductor HM1~4, at this time logic
Control circuit internal record waypoint voltage VS1.
As pulsating volage continues to rise, when pulsating volage reaches the cut-in voltage of second level LED light, each lamp string flow point
Not Jing Guo respective second level LED flow to channel 2, channel 6, channel 10 and channel 14；Channel 6, channel 10 and channel are flowed at this time
14 electric current IR2, IG2, IB2 is generated by channel current generation circuit, and error amplifier, metal-oxide-semiconductor MN1, MP1 and resistance R2 are generated
Then electric current VREF1/R2 is mentioned by the current mirror that metal-oxide-semiconductor MP2, MN2 and MN6~8 are constituted to channel 6, channel 10 and channel 14
For electric current.At the t2 moment, current detection circuit detects that I_WLED reaches given threshold VREF1/R1, output detection signal I_P,
Logic control circuit turns off MOS switch pipe HM5~8, at this time logic control circuit internal record waypoint voltage VS2.
As pulsating volage continues to rise, when pulsating volage reaches the cut-in voltage of third level LED light, each lamp string flow point
Not Jing Guo respective third level LED flow to channel 3, channel 7, channel 11 and channel 15；Channel 7, channel 11 and channel are flowed at this time
15 electric current IR3, IG3, IB3 is generated by channel current generation circuit, and error amplifier, metal-oxide-semiconductor MN1, MP1 and resistance R2 are generated
Electric current VREF1/R2, the current mirror being then made up of metal-oxide-semiconductor MP2, MN2 and MN9~11 is to channel 7, channel 11 and channel 15
Electric current is provided.At the t3 moment, current detection circuit detects that I_WLED reaches given threshold VREF1/R1, output detection signal I_
P, logic control circuit turn off MOS switch pipe HM9~12, at this time logic control circuit internal record waypoint voltage VS3.
As pulsating volage continues to rise, when pulsating volage reaches the cut-in voltage of fourth stage LED light, each lamp string flow point
Not Jing Guo respective fourth stage LED flow to channel 4, channel 8, channel 12 and channel 16；Channel current I_WLED, I_RLED, I_
GLED and I_BLED determines by WRGB constant-current circuit, and electric current flows to sampling resistor R3~R6 through high-voltage MOS pipe HM13~16, and
Pressure drop V1~V4 is generated on sampling resistor, these voltage values are connected to the reverse input end of error amplifier as feedback signal, directly
To equal with non-inverting input terminal voltage VREF1, obtain channel constant current value be respectively VREF1/R3, VREF1/R4,
VREF1/R5 and VREF1/R6.
As pulsating volage further increases, it is able to maintain that each LED light string electric current is stablized in constant current value, pulsating volage reaches
It after peak value, being gradually reduced, after decline to a certain extent, is not enough to maintain electric current constant, each LED light string electric current is begun to decline, when
When pulsating volage drops to less than the cut-in voltage of fourth stage LED, MOS switch pipe HM9~12 is opened, channel 3, channel 7, channel
11 and channel 15 be connected, WLED4, RLED4, GLED4 and BLED4 unit extinguish.
At the t4 moment, when pulsating volage gradually decreases to be less than VS3, logic control circuit opens high-pressure MOS switching tube HM5
~8 open, and channel 2, channel 6, channel 10 and channel 14 are connected, and LED current is flowed from channel 2, channel 6, channel 10 and channel 14
It crosses, WLED3, RLED3, GLED3 and BLED3 unit extinguish.
At the t5 moment, when pulsating volage gradually decreases to be less than VS2, logic control circuit opens high-pressure MOS switching tube HM1
~4 open, and channel 1, channel 5, channel 9 and channel 13 are connected, and LED current is flowed through from channel 1, channel 5, channel 9 and channel 13,
WLED2, RLED2, GLED2 and BLED2 unit extinguish.
At the t6 moment, when pulsating volage gradually decreases to flow through channel 1, channel 5, channel 9 and channel 13 less than VS1
Electric current is gradually reduced, when pulsating volage gradually decreases to the cut-in voltage less than WLED1, RLED1, GLED1 and BLED1 unit
When, WLED1, RLED1, GLED1 and BLED1 unit extinguish.It, can be by the light modulation of different duty in said one periodic process
Signal realizes fine light modulation, and then realizes colored driving, adjusts spatial distribution, improves illumination efficiency.
Fig. 6 be WLED, RLED in a kind of four-way AC LED drive chip circuit finely dimmed in the present embodiment,
Working waveform figure of GLED, BLED lamp string under different duty dim signal.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. the four-way AC LED drive chip circuit that finely dims of one kind, which is characterized in that including rectifier bridge, bleeder circuit,
Current detection circuit, logic control circuit, pwm circuit, light modulation and protection circuit, channel current generation circuit, WRGB Constant Electric Current
Road, WLED lamp string, RLED lamp string, GLED lamp string, BLED lamp string and protection circuit；
The WLED lamp string, RLED lamp string, GLED lamp string and BLED lamp string include multi-stage LED；Wherein, first order LED is by
A string of LED light strings composition, second level LED are made of two string LED light strings before adjacent, and third level LED goes here and there LED light string group by first three
At, and so on constitute multi-stage LED.
First order LED in the rectifier bridge, output end and WLED lamp string, RLED lamp string, GLED lamp string and BLED lamp string
Input terminal is connected；
The bleeder circuit, one end are connected with rectifier bridge, and the other end is connected with logic control circuit；
The current detection circuit, the source electrode for the injectron in control channel that one end is connected respectively and with WLED lamp string
It is connected, the other end is connected with logic control circuit；
The logic control circuit is connected with light modulation and protection circuit；For in input voltage ascent stage, current detecting electricity
When road exports a pulse signal effect logic control circuit, generates and remove afterbody on control WLED, RLED, GLED and BLED
The signal that remaining switching group at different levels outside LED successively turn off；In the input voltage decline stage, control WLED, RLED, GLED are generated
And the signal that remaining switching group at different levels on BLED in addition to afterbody LED are successively opened；
The pwm circuit is connected with light modulation and protection circuit；For each in generation and WLED, RLED, GLED and BLED lamp string
The dim signal of the corresponding control channel of grade LED；
The light modulation and protection circuit, one end are connected with logic control circuit, and one end is connected with pwm circuit and protection circuit, separately
One end is connected with the grid of metal-oxide-semiconductor in switching gate module；Control signal, pwm circuit for being generated to logic control circuit
The protection signal that the dim signal and protection circuit of generation generate is integrated, and is removed on WLED, RLED, GLED and BLED to control
The on-off of remaining switching group at different levels outside afterbody LED realizes the LED at different levels of WLED, RLED, GLED and BLED lamp string successively
It lights and successively extinguishes；
The channel current generation circuit is connected with the source electrode of metal-oxide-semiconductor in switching gate module；
Afterbody LED's is defeated in the WRGB constant-current circuit, with WLED lamp string, RLED lamp string, GLED lamp string and BLED lamp string
Outlet is connected；
The protection circuit, for providing overvoltage protection and overheat protector.
2. the four-way AC LED drive chip circuit that one kind according to claim 1 finely dims, which is characterized in that institute
Stating pwm circuit includes comparator.
3. the four-way AC LED drive chip circuit that one kind according to claim 2 finely dims, which is characterized in that
In the pwm circuit, by the way that four different reference voltages are arranged, compared with internal sawtooth voltage, generation WLED, RLED,
The dim signal of GLED and BLED lamp string corresponding channel.
4. the four-way AC LED drive chip circuit that one kind according to claim 1 finely dims, which is characterized in that institute
Stating light modulation and protection circuit includes AND gate circuit.
5. the four-way AC LED drive chip circuit that one kind according to claim 4 finely dims, which is characterized in that
It is described light modulation and protection circuit in, the output signal of logic control circuit, the output signal of pwm circuit and protection circuit it is defeated
Signal is connected with door input terminal respectively out, is connected with gate output terminal with the grid of switching gate module high-voltage switch pipe
It connecing, output signal controls upper remaining switching group at different levels in addition to afterbody LED of WLED, RLED, GLED and BLED, realization WLED,
The LED at different levels of RLED, GLED and BLED lamp string are successively lighted and are successively turned off.
6. the four-way AC LED drive chip circuit that one kind according to claim 1 finely dims, which is characterized in that institute
Stating channel current generation circuit includes error amplifier, metal-oxide-semiconductor and resistance R2.
7. the four-way AC LED drive chip circuit that one kind according to claim 1 finely dims, which is characterized in that institute
Stating WRGB constant-current circuit includes error amplifier, metal-oxide-semiconductor and resistance.
8. the four-way AC LED drive chip circuit that one kind according to claim 7 finely dims, which is characterized in that institute
It is identical as lamp string number of types to state error amplifier number in WRGB constant-current circuit, resistance number and metal-oxide-semiconductor number.
9. the four-way AC LED drive chip circuit that one kind according to claim 1 finely dims, which is characterized in that lamp
String type and not limited in WLED lamp string, RLED lamp string, GLED lamp string, BLED lamp string these four.
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| CN109348582B (en) | 2024-06-25 |
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