CN109982489A - Linear constant current stepless dimming controller IC - Google Patents
Linear constant current stepless dimming controller IC Download PDFInfo
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- CN109982489A CN109982489A CN201910359096.3A CN201910359096A CN109982489A CN 109982489 A CN109982489 A CN 109982489A CN 201910359096 A CN201910359096 A CN 201910359096A CN 109982489 A CN109982489 A CN 109982489A
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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]
- H05B45/10—Controlling the intensity of the light
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The present invention discloses a kind of linear constant current stepless dimming controller IC, the integrated circuit is connected to input voltage source through current source loads, the input voltage source provides the unidirectional pulsation network voltage rectified to ac grid voltage, and the IC interior is equipped with light modulation D/A converting circuit, power network current control circuit and error amplifying circuit.The present invention realizes high-efficient linear constant current stepless dimming and leaps from scratch, and provides and be uniquely realized with a low cost mode.
Description
Technical field
The present invention relates to Linear constant-current controller circuits, in particular to a kind of linear constant current stepless dimming controller
Integrated circuit, the driving device comprising the controller IC, and the intelligent luminaire comprising the driving device.
Background technique
As the lighting source of a new generation, light emitting diode (LED) has been used widely.In global illumination market,
LED illumination is estimated to account for seven, eighty per cant or more.As LED illumination market is gradually saturated, growth is out of strength, and profit constantly declines, this
Industry is sought for transition and upgrade.Compared to traditional lighting, LED illumination has a sizable advantage, that is, realizes lamps and lanterns
Light modulation (adjusting brightness) and toning (changing the color of light) are relatively easy many.This advantage is just needed for intelligent lighting.At present
The whole world has entered the intelligent epoch, and intelligence is increasingly becoming innovation hot spot, such as artificial intelligence AI, Internet of Things, smart home etc..
In smart home, intelligent lighting may realize commercialization at first, this is substantially industry common recognition.It is 10 years following, it will be intelligence
10 years of science and technology great development also will be 10 years of LED intelligent illumination great development.
LED constant current controller in the market has following classification, and low PF (PF < 0.6) switchs constant-current controller, high PF (PF >
0.9) constant-current controller, normal linear constant-current controller, high-efficient linear constant-current controller are switched.Currently, preceding two quasi-controller
Occupation rate of market highest, Duo Jia driving chip company falls over each other to innovate so that these two types of constant-current controller had it is perfect, at
Ripe intelligent dimming interface circuit.Followed by normal linear constant-current controller, occupation rate of market constantly rises, intelligent dimming
It realizes very simple, mature.High-efficient linear constant-current controller occupation rate of market is also in lasting rising, but this kind of constant current control only
Device processed does not have intelligent dimming interface circuit still.
For high-efficient linear constant-current controller by inventor my invention, Fig. 1 is the exemplary circuit structure chart of the controller.Such as
Shown in Fig. 1, after exchange 110V or 220V network voltage is rectified by rectifier bridge 180, input voltage source VIN provides 100/
The unidirectional pulsation network voltage of 120Hz.The control loop of controller 100 amplifies electricity by power network current control circuit 120 and error
Road 130 is constituted, to realize the accurate control to power network current.Controller 100 is integrated on a chip.
Power network current control circuit 120 is based on VSD node voltage signal and enlarged error signal EAO, controls in list
Power network current is obtained into the obtaining current window of pulsation network voltage.Partial pressure of the VSD node voltage from input voltage source VIN,
Feedforward action is played, control loop responds the fluctuation of network voltage quickly.
Detection signal CS based on the power network current flowed out through power network current control circuit 120, error amplifying circuit 130 are determined
Determine the average current of power network current, that is, the average current of LED load 190, while exporting enlarged error signal EAO.
Signal EAO is sent to power network current control circuit 120.
Referring to Fig. 2, Fig. 2 shows the signal waveforms that Fig. 1 controller obtains power network current.High-efficient linear constant-current controller
Working principle is, just draws power grid electricity when controller 100 is near cut-in voltage VLED of the VIN voltage Jing Guo LED load 190
Stream, and other when power network current be zero.The low spot of this VIN window is VLED, and high point is VLED+ Δ V.As can be seen that height
The operating current of efficiency linear constant-current controller is not continuous, pulsation；Pulsation period is the two of network voltage period
/ mono-, that is to say, that the frequency of controller operating current is that 100/120Hz (respectively corresponds ac grid voltage frequency 50/
60Hz)。
Referring again to Fig. 1.Bandwidth in the control loop of controller 100, because of its frequency bandwidth more than error amplifier 131
(usually big 5000 times or more) greatly, peak point current amplifier 123 directly controls the size of power network current.The peak value of power network current by
Reference voltage REFP and the decision of detection resistance 181, i.e.,
IPEAK=V (REFP)/R181 (1)
Average output current then determines by error amplifier 131 and reference voltage REFA, i.e.,
IAVG=V (REFA)/R181 (2)
In general, reference voltage REFP is twice to ten times of height of REFA, ratio is substantially stationary.
Compared with normal linear constant-current controller, the feature of high-efficient linear constant-current controller maximum is, controller wave
The power that expense is fallen is small (down to 0.8W), energy conversion efficiency height (up to 90%).The market tests of many years it has been proved that this
Technical solution is reliable, valuable.
Skilled in the art realises that dimming mode is broadly divided into two kinds, the light modulation of PWM count word and simulation are dimmed.PWM count word
Light modulation is intermittent illumination mode, and simulates the illumination mode that light modulation is continuous-stable.In history, what is be applied at first is
Simulate light regulating technology.But with the rise of digital technology, digital dimming obtains rapidly overwhelming advantage.Simulation light regulating technology is deposited
In at high cost, poor anti-interference, the problems such as inconvenient is debugged, in contrast, the circuit structure of digital dimming is simple, reliable, design
Debugging production is easier to, while low in cost.In more mature LCD backlight control system (such as LCD TV backlight, liquid
The systems such as crystal display backlight, laptop backlight and tablet computer backlight) in, digital dimming technology is with being in absolute monopoly
Position.
In LED intelligent illumination industry, PWM count word dimming interface is also standard configuration, currently on the market popular switch constant current
Intelligent controller, normal linear closed-loop device all use PWM count word dimming interface.That is, switch constant current intelligence
It can control device and normal linear closed-loop device all support intermittent illumination mode, interval luminous frequency is generally 200Hz
To 5KHz, this is also the frequency of PWM dim signal.
However, above-mentioned high-efficient linear constant-current controller does not support digital intermittent illumination mode but, this is by its uniqueness
Working method determine.As it was noted above, the operating current of high-efficient linear constant-current controller (may with LED load electric current
It is not identical) it is to pulse in the period, frequency only has 100/120Hz.Theoretically, in order to ensure system steady operation, PWM light modulation frequency
Rate must be far below system working frequency 100/120Hz, usually require that low ten times hereinafter, namely 10Hz hereinafter, so it is low
Optical flare caused by PWM light modulating frequency can not allow people to receive.And generally switch the working frequency of constant-current controller 50KHz with
On, so 5KHz intermittent digital dimming below can be supported.The operating current of normal linear constant-current controller is (with LED load
Electric current is identical) it is usually direct current, support intermittent digital dimming more without any obstacle.
Summary of the invention
It is this kind of the object of the present invention is to which the defect of intelligent dimming can not be carried out for high-efficient linear constant-current controller
Controller provides a kind of suitable intelligent stepless light modulation implementation, thus realize high-efficient linear constant current stepless dimming from without to
Some leaps.
According to the first aspect of the invention, a kind of linear constant current stepless dimming controller IC is provided, it is described integrated
Circuit is connected to input voltage source VIN through current source loads, what the input voltage source VIN offer rectified ac grid voltage
Unidirectional pulsation network voltage, the IC interior are equipped with light modulation D/A converting circuit, power network current control circuit and mistake
Poor amplifying circuit, wherein a PWM dim signal is converted to the first proportional simulation of voltage and believed by light modulation D/A converting circuit
The voltage of number REFA and the second analog signal REFP, the first analog signal REFA be equal to the duty ratio of PWM dim signal with
The product of one reference voltage；Power network current control circuit, based on a voltage division signal from the input voltage source VIN, once
The error signal of amplification and the second analog signal REFP are controlled and are obtained in the obtaining current window of the unidirectional pulsation network voltage
Power network current, and adjust the peak value of power network current；Error amplifying circuit, based on the electricity flowed out through the power network current control circuit
The detection signal of net electric current and the first analog signal REFA adjust the average value of the power network current, and generate described through putting
Big error signal.
In first aspect, it is preferred that the voltage of the second analog signal REFP is the first analog signal REFA voltage
Twice to ten times.
Preferably, the light modulation D/A converting circuit includes the first and second NMOS tube, phase inverter, filter circuit and ratio
Example amplifier, wherein the first NMOS tube, grid receive the PWM dim signal, and drain electrode connects the reference voltage；Second
NMOS tube, grid receive PWM dim signal through the phase inverter, and source electrode connection is with reference to ground, the source of drain electrode and the first NMOS tube
Pole is commonly connected to SD node；Filter circuit filters the signal of the SD node；Proportional amplifier, by operational amplifier and
First, second resistance is constituted, and the first, second resistance is connected on the output end of operational amplifier and with reference between ground；Operation amplifier
The non-inverting input terminal of device receives the output signal of the filter circuit, and inverting input terminal connects between the first, second resistance
Node generates the first analog signal REFA to the node between first, second resistance, in the output of operational amplifier
End generates the second analog signal REFP.
Preferably, the power network current control circuit includes: subtracter, and one input end is received from the input electricity
The voltage division signal of potential source (VIN), another input terminal receive the enlarged error signal, generate the first output signal；Addition
Device, one input end receive first output signal, and another input terminal receives the detection signal of the power network current, generate the
Two output signals；Peak point current amplifier, one input end receive second output signal, and another input terminal receives described the
Two analog signals (REFP)；And power field effect pipe, grid connect the output end of the peak point current amplifier, drain electrode
It is connected to input voltage source (VIN) through the current source loads, source electrode is connected to through detection resistance with reference to ground.
Preferably, the error amplifying circuit includes error amplifier and is made of integrating resistor and integrating capacitor
Integrating circuit, wherein the integrated resistance of error amplifier first input end receives the detection signal of the power network current, the
Two input terminals receive first analog signal (REFA), and output end generates the enlarged error signal；Integrating capacitor,
It is connected between the error amplifier first input end and the intermediate node and the error amplifier output of integrating resistor.
Preferably.The IC interior is additionally provided with: voltage division signal provides circuit, including the first, second, third electricity
Resistance and a voltage regulator circuit, wherein described first resistor one end is connected by being located at the supplying resistance of the integrated circuit external
To input voltage source (VIN), the other end connects the voltage regulator circuit；Second resistance one end connects the supplying resistance and the first electricity
Node between resistance in integrated circuit, the other end are connected to by 3rd resistor with reference to ground；Between second, third described resistance
VSD node is connect with the power network current control circuit, to provide the voltage division signal.
Preferably, it is provided inside circuit in the voltage division signal, the VCC section between the first resistor and voltage regulator circuit
Point is integrated circuit.
According to second aspect, a kind of device for driving current source loads is provided, including the collection as described in above-mentioned first aspect
At circuit, electrolytic capacitor and intelligence MCU, wherein the electrolytic capacitor is connected in parallel on the both ends of the current source loads, the intelligence
It can light modulation D/A converting circuit offer PWM dim signal of the MCU into integrated circuit.
According to the third aspect, a kind of device for driving current source loads is provided, including the collection as described in above-mentioned first aspect
At circuit, supplying resistance, electrolytic capacitor and intelligence MCU, wherein the electrolytic capacitor is connected in parallel on the two of the current source loads
End, light modulation D/A converting circuit of the intelligence MCU into integrated circuit provide PWM dim signal.
According to fourth aspect, a kind of intelligent luminaire is provided, including the device as described in above-mentioned second or third aspect
And LED load.
According to the present invention, make the innovation of high-efficient linear constant-current controller using digital analog mixed light regulating technology, dexterously
It solves the problems, such as that this quasi-controller does not support digital intermittent illumination mode, not only realizes high-efficient linear constant current stepless-adjustment
Light leaps from scratch, and provides and be uniquely realized with a low cost mode.Meanwhile linear constant current stepless dimming of the invention
Controller IC remains this high advantage of energy conversion efficiency.Therefore, the present invention is beneficial to LED high-efficient linear intelligence
The acceleration that can be illuminated is universal, makes due bigger contribution to worldwide energy-saving and emission-reduction.
Detailed description of the invention
For a better understanding of the invention, hereafter with embodiment combination attached drawing, the invention will be further described.In attached drawing:
Fig. 1 is the circuit structure diagram of the high-efficient linear constant-current controller of the prior art；
Fig. 2 shows the signal waveforms that Fig. 1 controller obtains power network current；
Fig. 3 is the circuit structure diagram of the linear constant current stepless dimming controller of one embodiment of the invention；
Fig. 4 is the example that D/A converting circuit is dimmed in Fig. 3；
Fig. 5 shows the operating voltage waveform of each node in light modulation D/A converting circuit；
Fig. 6 is the circuit structure diagram of the linear constant current stepless dimming controller of another embodiment of the present invention.
Specific embodiment
Inventor considers that high-efficient linear constant-current controller does not support intermittent PWM count word to dim, that is attempted to using mould
Quasi- light regulating technology.And on the circuit interface of external smart MCU, preferably with PWM count word interface.This is because being adjusted with simulation
Optical circuit interface is compared, and PWM count word light adjusting circuit interface cost is low, anti-interference good and debugging production is easy.So the present invention
In, high-efficient linear constant-current controller uses PWM count word external interface, and PWM count word dim signal is converted to simulation again by inside
Dim signal realizes internal simulation brightness adjustment control, this is a kind of digital analog mixed light regulating technology.
It is the circuit structure diagram of the linear constant current stepless dimming controller of one embodiment of the invention referring to Fig. 3, Fig. 3.With Fig. 1
Unlike scheme, in the inside of controller IC 200, light modulation D/A converting circuit 240 is added；Also, in controller
Intelligent MCU module 199 is added in the outside of integrated circuit 200, to provide PWM light modulation letter to light modulation D/A converting circuit 240
Number.Here, intelligent MCU module 199, which can be, can provide any intelligent dimming control module of PWM dim signal, such as human body
Infrared inductive control module, microwave induced control module, Bluetooth control module, 2.4G wireless control module, WIFI are remotely controlled
The modules such as module.It dims D/A converting circuit 240 and receives this external PWM dim signal, it is quasi- by digital revolving die, it is converted
For voltage proportional two simulation dim signals REFA and REFP.
Simulation dim signal REFP is sent to the peak point current amplifier 123 in power network current control circuit 120, for adjusting
The peak I of power network currentPEAK.Simulation dim signal REFA is then sent to the error amplifier 131 in error amplifying circuit 130, uses
In the average value I for adjusting power network currentAVG。
It theoretically requires, simulates and meet between the voltage of dim signal REFA and the duty ratio D of PWM dim signal with offline
Property mathematical relationship:
V (REFA)=DPWM*V(REF) (3)
Fig. 4 is the example for dimming D/A converting circuit 240.As shown in figure 4, light modulation D/A converting circuit 240 includes NMOS
Pipe 241 and 243, phase inverter 242, filter circuit and proportional amplifier.Wherein, the grid of NMOS tube 241 receives PWM light modulation letter
Number, drain electrode connection reference voltage REF；The inverted device 242 of the grid of NMOS tube 243 receives the PWM dim signal, source electrode connection ginseng
Ground GND is examined, drain electrode and the source electrode of NMOS tube 241 are commonly connected to SD node.The filtered electrical being made of resistance 244 and capacitor 245
Road filters the signal of SD node.Proportional amplifier is made of operational amplifier 246 and resistance 247,248.Resistance 247,248 is gone here and there
It is associated in the output end of operational amplifier 246 and with reference between ground GND；The non-inverting input terminal of operational amplifier 246 accepts filter electricity
The output signal on road, inverting input terminal connect the node between resistance 247,248.
When the PWM dim signal that external smart MCU module 199 exports is high level, NMOS tube 243 is closed, NMOS tube
241 are opened, and such SD node voltage is equal to reference voltage REF；And when PWM dim signal is low level, NMOS can be made
Pipe 241 is closed, and NMOS tube 243 is opened, and thus SD node voltage is equal to zero.Three above key node is shown referring to Fig. 5, Fig. 5
Operating voltage waveform.As can be seen that the waveform frequency of SD node, duty cycle information be as PWM dim signal, only SD
The high level of node is no longer coarse digital voltage, and become an accurate clean stable simulation reference voltage (such as
300mV).Using above-mentioned filter circuit, so that it may obtain one and stablize smooth analog voltage DAC, the voltage is mathematically etc.
In the duty ratio and the product of V (REF) of the average value of SD voltage, that is, SD, strict mathematical expression is above-mentioned formula 3.
In Fig. 4, for the filter circuit that resistance 244, capacitor 245 form, RC time constant is generally required to compare pwm pulse
Period is 10 times big, i.e.,
R244*C245> 10/FPWM (4)
Since the low-limit frequency of general PWM dimmer pulse can arrive 200Hz or so, the period is 5 milliseconds or so, above-mentioned filtered electrical
The RC time constant on road needs to be greater than 50 milliseconds.If R244100 megohms of value, C245Capacitance then cannot be below 500pF.For
For modern integrated circuits technique, such resistance and the not so difficult realization of capacitor's capacity.
In the proportional amplifier of Fig. 4, the node between resistance 247,248 generates simulation dim signal REFA, in operation
The output end of amplifier 246 generates simulation dim signal REFP.As can be seen that REFA voltage is equal to node DAC voltage, and REFP
The mathematical relationship of voltage and REFA voltage is as follows, this is a linear ratio relation:
V (REFP)=(1+R247/R248)*V(REFA) (5)
By the resistance value for selecting resistance 247,248, it is preferable that 2 to 10 times of REFP voltage REFA voltage can be made.
High-efficient linear constant-current system realizes stepless dimming as a result, and theoretical dimming scope is 0 to 100%, in light modulation model
Enclosing interior system still keeps high efficiency to convert, and low in cost, and the control loop of system does not increase additional element.
Referring again to Fig. 3.The inside of controller IC 200, power network current control circuit 120 include subtracter 121,
Adder 122, peak point current amplifier 123 and power field effect pipe 124.Wherein, 121 1 input terminal of subtracter is saved by VSD
Point receives the voltage division signal of VIN, and another input terminal receives enlarged error signal EAO, generates output signal SUBO.Output letter
Number SUBO voltage is that the voltage difference of two nodes of VSD and EAO is multiplied by COEFFICIENT K, i.e.,
V (SUBO)=K* (VSD-EAO) (6)
The size of K >=1, K determine power network current decline/rising slope at obtaining current window upper limit.
122 1 input terminal of adder receives output signal SUBO, and another input terminal receives the detection signal CS of power network current,
Generate output signal ADDO.Output signal ADDO voltage is equal to the sum of two applied signal voltages, i.e.,
V (ADDO)=SUBO+CS (7)
123 1 input terminal of peak point current amplifier receives output signal ADDO, and another input terminal receives light modulation digital-to-analogue conversion
The simulation dim signal REFP that circuit 240 generates.The output of the grid connection peak value current amplifier of power field effect pipe 124
End, drain electrode are connected to VIN through LED load 190, and source electrode is connected to through detection resistance 181 with reference to ground.
As shown in figure 3, error amplifying circuit 130 is including error amplifier 131 and by integrating resistor 133, integrating capacitor
132 integrating circuit constituted.Wherein, the integrated resistance 133 of 131 first input end of error amplifier receives power network current detection letter
Number CS, the second input terminal receive the simulation dim signal REFA that light modulation D/A converting circuit 240 generates, and output end is generated through amplifying
Error signal EAO；Integrating capacitor 132 is connected to the intermediate node and mistake of error amplifier first input end Yu integrating resistor 133
Between poor amplifier out.
In the inside of controller IC 200, it is additionally provided with voltage division signal and circuit is provided.The circuit includes resistance 102, electricity
Resistance 105, resistance 106 and voltage regulator circuit 110.Wherein, 102 one end of resistance is by being located at the power supply electricity outside integrated circuit 200
Resistance 183 is connected to input voltage source VIN, and the other end connects voltage regulator circuit 110；105 one end of resistance connects supplying resistance 183 and electricity
Node between resistance 102 in integrated circuit 200, the other end are connected to by resistance 106 with reference to ground；Resistance 105, resistance 106 it
Between VSD node connect with power network current control circuit 120, to provide the voltage division signal to VIN.Also, in voltage division signal
It provides inside circuit, the VCC node between resistance 102 and voltage regulator circuit 110 is integrated circuit.
As can be seen that voltage division signal is provided to the inside that circuit is set to controller IC 200, so that the China and foreign countries Fig. 3
It encloses that element is few, only includes an electrolytic capacitor 185 for being connected in parallel on 190 both ends of LED load and two resistance, thus utmostly
Ground optimizes the cost of high-efficient linear constant current stepless dimming system.
Voltage division signal provides circuit and may also set up in the outside of controller IC.The present invention is shown referring to Fig. 6, Fig. 6
The circuit structure of the linear constant current stepless dimming controller of another embodiment.In the embodiment, VSD node be located at controller collection at
Except circuit 300, partial pressure of the node voltage from 005,006 couple of input voltage source VIN of integrated circuit external resistance.In addition,
The outside of controller IC 300 also is located at for the VCC node of integrated circuit, as shown in fig. 6, VCC node is outside
Node between resistance 183 and capacitor 004；VCC clamp circuit 010 inside controller IC 300, effect is
Limit the ceiling voltage of VCC node.The working principle of the embodiment other parts, circuit structure are similar with Fig. 3, repeat no more.
In description above, although the present invention be for driving LED load, those skilled in the art are easy to
Understand, the present invention can be used for driving any current source loads.
It is clear that invention described herein can there are many variations, this variation must not believe that deviation is of the invention
Spirit and scope.Therefore, all changes that will be apparent to those skilled in the art, are included in the culvert of the appended claims
Within the scope of lid.
Claims (10)
1. a kind of linear constant current stepless dimming controller IC, the integrated circuit is connected to input electricity through current source loads
Potential source (VIN), the input voltage source (VIN) provide the unidirectional pulsation network voltage rectified to ac grid voltage, the collection
D/A converting circuit, power network current control circuit and error amplifying circuit are dimmed at being equipped with inside circuit, wherein
D/A converting circuit is dimmed, a PWM dim signal is converted into proportional the first analog signal (REFA) of voltage and the
Two analog signals (REFP), the voltage of first analog signal (REFA) are equal to the duty ratio and a reference of PWM dim signal
The product of voltage；
Power network current control circuit, voltage division signal, an enlarged error based on one from the input voltage source (VIN) are believed
Number and the second analog signal (REFP), control it is described it is unidirectional pulsation network voltage obtaining current window in obtain power network current,
And adjust the peak value of power network current；
Error amplifying circuit, detection signal and the first simulation based on the power network current flowed out through the power network current control circuit
Signal (REFA) adjusts the average value of the power network current, and generates the enlarged error signal.
2. integrated circuit as described in claim 1, which is characterized in that the voltage of second analog signal (REFP) is first
Twice to ten times of analog signal (REFA) voltage.
3. integrated circuit as claimed in claim 2, which is characterized in that the light modulation D/A converting circuit includes first and second
NMOS tube, phase inverter, filter circuit and proportional amplifier, wherein
First NMOS tube, grid receive the PWM dim signal, and drain electrode connects the reference voltage；
Second NMOS tube, grid receive PWM dim signal through the phase inverter, and source electrode connection is with reference to ground, drain electrode and first
The source electrode of NMOS tube is commonly connected to SD node；
Filter circuit filters the signal of the SD node；
Proportional amplifier is made of operational amplifier and the first, second resistance, and the first, second resistance is connected on operational amplifier
Output end and with reference between ground；The non-inverting input terminal of operational amplifier receives the output signal of the filter circuit, reverse phase
Input terminal connects the node between the first, second resistance, generates the first mould to the node between first, second resistance
Quasi- signal (REFA) generates the second analog signal (REFP) in the output end of operational amplifier.
4. integrated circuit as described in claim 1, which is characterized in that the power network current control circuit includes:
Subtracter, one input end receive the voltage division signal for coming from the input voltage source (VIN), described in another input terminal receives
Enlarged error signal generates the first output signal；
Adder, one input end receive first output signal, and another input terminal receives the detection letter of the power network current
Number, generate the second output signal；
Peak point current amplifier, one input end receive second output signal, and another input terminal receives second simulation
Signal (REFP)；And
Power field effect pipe, grid connect the output end of the peak point current amplifier, drain through the current source loads
It is connected to input voltage source (VIN), source electrode is connected to through detection resistance with reference to ground.
5. integrated circuit as described in claim 1, which is characterized in that the error amplifying circuit include error amplifier and
The integrating circuit being made of integrating resistor and integrating capacitor, wherein the integrated resistance of error amplifier first input end connects
The detection signal of the power network current is received, the second input terminal receives first analog signal (REFA), and output end generates institute
State enlarged error signal；
Integrating capacitor, be connected to the error amplifier first input end and integrating resistor intermediate node and the error amplifier
Between output end.
6. integrated circuit as described in claim 1, which is characterized in that the IC interior is additionally provided with:
Voltage division signal provides circuit, including the first, second, third resistance and a voltage regulator circuit, wherein the first resistor one
End is connected to input voltage source (VIN) by being located at the supplying resistance of the integrated circuit external, and the other end connects the pressure stabilizing
Circuit；Second resistance one end connects the node between the supplying resistance and first resistor in integrated circuit, and the other end passes through the
Three resistance are connected to reference to ground；VSD node between second, third described resistance is connect with the power network current control circuit,
To provide the voltage division signal.
7. integrated circuit as claimed in claim 6, which is characterized in that provided inside circuit in the voltage division signal, described the
VCC node between one resistance and voltage regulator circuit is integrated circuit.
8. a kind of device for driving current source loads, which is characterized in that including the collection as described in any one of claims 1 to 5
At circuit, electrolytic capacitor and intelligence MCU, wherein the electrolytic capacitor is connected in parallel on the both ends of the current source loads, the intelligence
It can light modulation D/A converting circuit offer PWM dim signal of the MCU into integrated circuit.
9. a kind of device for driving current source loads, which is characterized in that including integrated circuit as claimed in claims 6 or 7, confession
Resistance, electrolytic capacitor and intelligence MCU, wherein the electrolytic capacitor is connected in parallel on the both ends of the current source loads, the intelligence
It can light modulation D/A converting circuit offer PWM dim signal of the MCU into integrated circuit.
10. a kind of intelligent luminaire, which is characterized in that including device as claimed in claim 8 or 9 and LED load.
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| CN115119354A (en) * | 2022-08-29 | 2022-09-27 | 珠海溪谷医疗科技有限公司 | Luminous power regulator for strong pulse light source and its method |
| WO2023016279A1 (en) * | 2021-08-09 | 2023-02-16 | 华润微集成电路(无锡)有限公司 | Pwm signal conversion circuit and method, and led dimming system |
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