CN104902648B - A kind of LED light adjusting circuits and light-dimming method with controllable silicon - Google Patents
A kind of LED light adjusting circuits and light-dimming method with controllable silicon Download PDFInfo
- Publication number
- CN104902648B CN104902648B CN201510320369.5A CN201510320369A CN104902648B CN 104902648 B CN104902648 B CN 104902648B CN 201510320369 A CN201510320369 A CN 201510320369A CN 104902648 B CN104902648 B CN 104902648B
- Authority
- CN
- China
- Prior art keywords
- signal
- square
- counter
- wave signal
- light modulation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED light adjusting circuits and light-dimming method with controllable silicon, dimming curve generative circuit obtains the controllable light modulation angle duty cycle signals of effective width according to the square-wave signal for characterizing the controlled silicon conducting angle information, then reference signal is obtained according to light modulation angle duty cycle signals and reference voltage signal, processing is filtered to reference signal using the compensating electric capacity of feedback compensation loop afterwards, to realize the dimming process to LED load.Wherein, dimming curve generative circuit obtains the light modulation angle duty cycle signals using counter, and it is filtered without the wave filter of low frequency, therefore, has saved a chip pin, and reduce chip cost and reduce area.
Description
Technical field
The present invention relates to field of switch power, in particular, it is related to a kind of LED light adjusting circuits and tune with controllable silicon
Light method.
Background technology
In the prior art, brightness adjustment control, controllable silicon light modulation are generally carried out to LED load using the dimming arrangement of controllable silicon
General principle be that the supply voltage that LED is loaded is adjusted by controlling the angle of flow of controllable silicon, reach light modulation
Purpose.
Light adjusting circuit of the prior art is as shown in figure 1, external input power is handled by controllable silicon Triac and rectifier bridge
The d. c. voltage signal of a phase shortage is obtained afterwards, and resistor voltage divider network is transferred to defeated after being sampled to the d. c. voltage signal of phase shortage
Enter the angle of flow letter that output one after voltage detecting circuit, the detection input voltage of input voltage detection circuit 11 characterizes the controllable silicon
The square-wave signal V of breathdim, afterwards, the average circuit 12 being made up of chopper circuit and filter circuit receives the square-wave signal, warp
The smoother dim signal V for characterizing the controlled silicon conducting angle information is obtained after copped wave, filtering processCF, in order to obtain preferably
Dimming effect, also pass through 13 couples of dim signal V of dimming curve generative circuit in the prior artCFCarry out at brightness refinement
Reason, to obtain more accurate reference signal VREF, afterwards, reference signal VREFWith output current feedback signal VIFBCarry out error
After amplification compensation, pwm control signal, output signal of the pwm control signal to control power stage circuit, to realize to institute are produced
LED load is stated to be dimmed.
In prior art solutions, the wave filter of a low frequency is needed in average circuit (by resistance R1 and electric capacity C1
Constitute), so the numerical value of electric capacity C1 here can be very big, being typically necessary control chip increases a pin this is big with external
Electric capacity；In addition, in error amplification compensation loop, needing also exist for a bulky capacitor and compensating, therefore, chip needs external two
Individual bulky capacitor, so not only increases the cost and area of chip, for the integrated also unfavorable of circuit.
The content of the invention
In view of this, the invention provides a kind of LED light adjusting circuits and light-dimming method with controllable silicon, dimming curve life
Reference signal, dimming curve generation electricity are directly generated according to the square-wave signal for the conducting angle information for characterizing the controllable silicon into circuit
Road only need to set counter to complete the generation of reference signal in chip internal, relative to prior art, without individually filter
Ripple electric capacity, so as to save chip pin and cost.
According to a kind of LED light adjusting circuits with controllable silicon of the present invention, include controllable silicon, rectifier bridge, power stage electricity
Road and adjusting control circuit, the direct current that external input voltage obtains a phase shortage after controllable silicon and rectifier bridge processing input electricity
Pressure, the power stage circuit receives the DC input voitage of the phase shortage to be converted to suitable output voltage supply LED load,
The adjusting control circuit includes light modulation angle detection circuitry, dimming curve generative circuit and feedback control circuit,
The light modulation angle detection circuitry receives the d.c. input voltage signal of the phase shortage, described controllable to obtain sign
The square-wave signal of the phase angle information of silicon；
The dimming curve generative circuit receives the square-wave signal, is carried out by the effective width to the square-wave signal
Control adjustment, to obtain the light modulation angle duty cycle signals that effective width is controllable, the light modulation angle duty cycle signals with it is described
The cycle of square-wave signal is consistent, and the dimming curve generative circuit is according to the light modulation angle duty cycle signals and reference voltage
Signal is to generate reference signal；
The feedback control circuit receives the reference signal and characterizes the voltage feedback signal of LED load electric current, to produce
Raw pwm control signal, the pwm control signal is to control the power switch pipe in the power stage circuit, with to LED load
Carry out brightness adjustment control.
Further, the dimming curve generative circuit includes the first counter, the second counter, comparison circuit and multiplication
Circuit,
First counter receives the square-wave signal, in the rising edge time of the square-wave signal, first meter
Number device is proceeded by plus count operation from initial value signal, also, in the period that the square-wave signal is high level effective width
In, first counter is carried out plus count operation with the first regulation step-length, until to be changed into low level invalid for the square-wave signal
State, the output signal of first counter is designated as the first count value；At the trailing edge moment of the square-wave signal, described
One counter is proceeded by from the first current count value subtracts count operation, also, is that low level is invalid in the square-wave signal
In the period of width, first counter carries out subtracting count operation with the second regulation step-length, until the one of the square-wave signal
Individual end cycle, first counter transmits the first count value this moment to second counter；
Second counter receives the first of the square-wave signal and the output of the upper counter of end cycle moment first
Count value, in the rising edge time of the square-wave signal, second counter is proceeded by from first count value subtracts meter
Number computing, also, in the square-wave signal in the period of high level effective width, second counter is walked with the 3rd regulation
Long progress subtracts count operation, until first count value is decreased to refer to no-voltage, the output letter of second counter
Number it is designated as the second count value；
The comparison circuit is connected to receive second count value, the comparison with the output end of second counter
Circuit also receives and refers to no-voltage, after comparing processing, exports the light modulation angle duty cycle signals；
The mlultiplying circuit receives the light modulation angle duty cycle signals and the reference voltage signal, to generate the ginseng
Examine signal.
Further, first counter believed the output in a upper cycle in the rising edge time of the square-wave signal
Number it is zeroed out, to recover to the initial value signal.
It is preferred that, the initial value signal is equal to the reference no-voltage.
It is preferred that, the size of the first regulation step-length, the second regulation step-length and the 3rd regulation step-length is adjusted to obtain not
Same light modulation angle duty cycle signals.
Further, first counter receives the first clock signal, first clock signal triggering along when
Carve, first counter carries out plus/minus count operation；
Second counter receives the second clock signal, the second clock signal triggering along the moment, described second
Counter carries out subtracting count operation；
It is preferred that, the cycle for adjusting first clock signal or second clock signal is accounted for obtaining different light modulation angles
Sky compares signal.
Further, the feedback control circuit includes error compensation circuit and pwm control circuit,
The error compensation circuit receives the voltage feedback signal and reference signal, through error amplification and compensation deals
Afterwards, thermal compensation signal is produced；
The pwm control circuit receives the thermal compensation signal, to produce the pwm control signal.
According to a kind of LED light-dimming methods with controllable silicon of the present invention, including controllable silicon, rectifier bridge, power stage circuit
And adjusting control circuit, external input voltage by controllable silicon and rectifier bridge processing after obtain a phase shortage direct current input electricity
Pressure, the power stage circuit receives the DC input voitage of the phase shortage to be converted to suitable output voltage supply LED load,
Comprise the following steps：
The d.c. input voltage signal of the phase shortage is received, to obtain the square wave for the phase angle information for characterizing the controllable silicon
Signal；
The square-wave signal is received, adjustment is controlled by the dutycycle to the square-wave signal, it is controllable to obtain
Angle duty cycle signals are dimmed, according to the light modulation angle duty cycle signals and reference voltage signal to generate reference signal；
Receive the reference signal and characterize the voltage feedback signal of LED load electric current, to produce pwm control signal, institute
Pwm control signal is stated to control the power switch pipe in the power stage circuit, to carry out brightness adjustment control to LED load.
Further, the specific steps that the reference signal is produced include：
The square-wave signal and initial value signal are received, in a cycle of the square-wave signal, in square wave letter
Number it is the period of high level effective width, the initial value signal is carried out plus count operation with the first regulation step-length, up to institute
State square-wave signal and be changed into low level disarmed state, export the first count value, be the invalid width of low level in the square-wave signal
In period, the first current count value is carried out subtracting count operation with the second regulation step-length, until one of the square-wave signal
End cycle, the first count value of storage this moment；
Meanwhile, in a cycle of the square-wave signal, in the period that the square-wave signal is high level effective width
In, the first count value that the upper end cycle moment is exported carries out subtracting count operation with the 3rd regulation step-length, until will be described
First count value is decreased to refer to no-voltage, exports the second count value；
Compare second count value and refer to no-voltage, export the light modulation angle duty cycle signals；
The light modulation angle duty cycle signals are multiplied with the reference voltage signal, to generate the reference signal.
It is preferred that, the size of the first regulation step-length, the second regulation step-length and the 3rd regulation step-length is adjusted to obtain not
Same light modulation angle duty cycle signals.
Further, first count value is produced using the first counter, first counter receives the first clock
Signal, first clock signal triggering along the moment, first counter carries out plus/minus count operation；
Second count value is produced using the second counter, second counter receives the second clock signal, described
The triggering of second clock signal is along the moment, and second counter carries out subtracting count operation.
It is preferred that, the cycle for adjusting first clock signal or second clock signal is accounted for obtaining different light modulation angles
Sky compares signal.
In summary, a kind of LED light adjusting circuits and light-dimming method with controllable silicon of the invention, dimming curve generation electricity
Road obtains the controllable light modulation angle dutycycle of an effective width according to the square-wave signal for characterizing the controlled silicon conducting angle information and believed
Number, reference signal then is obtained according to light modulation angle duty cycle signals and reference voltage signal, feedback compensation ring is utilized afterwards
The compensating electric capacity on road is filtered processing to reference signal, to realize the dimming process to LED load.Wherein, dimming curve
Generative circuit obtains the light modulation angle duty cycle signals using counter, and it is filtered without the wave filter of low frequency, therefore,
A chip pin has at least been saved, and has reduced chip cost and reduces area.
Brief description of the drawings
Fig. 1 show the LED light adjusting circuits of prior art；
Fig. 2 show a kind of circuit block diagram of LED light adjusting circuits with controllable silicon according to the present invention；
Fig. 3 show a kind of embodiment of dimming curve generative circuit in Fig. 2；
Fig. 4 show the working waveform figure of the dimming curve generative circuit according to the present invention；
Fig. 5 show a kind of flow chart of LED light-dimming methods with controllable silicon according to the present invention.
Embodiment
Several preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to
These embodiments.The present invention covers any replacement, modification, equivalent method and side made in the spirit and scope of the present invention
Case.Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific thin
Section, and description without these details can also understand the present invention completely for a person skilled in the art.
A kind of circuit block diagram of LED light adjusting circuits with controllable silicon according to the present invention is shown with reference to Fig. 2, it is described
LED light adjusting circuits include controllable silicon (Triac), rectifier bridge, power stage circuit and adjusting control circuit, external input voltage
The DC input voitage of a phase shortage is obtained after controllable silicon and rectifier bridge processing, the power stage circuit receives the phase shortage
DC input voitage supplies LED load to be converted to suitable output voltage Vout.Here, the power stage circuit is with inverse-excitation type
Exemplified by on-off circuit, it includes the transformer being made up of primary side winding Np and vice-side winding Ns, power switch pipe Q1, afterflow two
Pole pipe D1 and output capacitance C1.
The adjusting control circuit includes light modulation angle detection circuitry 21, dimming curve generative circuit 22 and feedback control electricity
Road 23.The light modulation angle detection circuitry 21 receives the d.c. input voltage signal of the phase shortage, described controllable to obtain sign
The square-wave signal of the phase angle information of silicon, here, light modulation angle detection circuitry 21 are sampled acquisition table by resistor voltage divider network
The information of the d.c. input voltage signal of the phase shortage is levied, note sampled signal is voltage LINE.Skilled person will appreciate that, adjust
Angular detection circuit 21 can be existing or improved technical method, such as timing circuit scheme of the prior art, for example
For the timing circuit being made up of comparison circuit and charge-discharge circuit in Patent No. 201210249167.2, by voltage
LINE phase-detection, can obtain the square-wave signal V for the phase angle information for characterizing the controllable silicondim。
Afterwards, the dimming curve generative circuit 22 receives the square-wave signal Vdim, to obtain reference signal V accordinglyREF,
Specifically, a kind of embodiment of the dimming curve generative circuit 22 according to the present invention is shown with reference to Fig. 3, with reference to Fig. 4
For the working waveform figure of dimming curve generative circuit.In the present embodiment, the dimming curve generative circuit 22 includes the first meter
Number device A, the second counter B, comparison circuit and mlultiplying circuit.The oscillogram of circuit diagram and Fig. 4 below in conjunction with Fig. 3 illustrates light modulation
The course of work of curve generative circuit：
First counter A receives the square-wave signal Vdim, in the square-wave signal VdimRising edge time, in such as Fig. 4
The t1 moment, the first counter A proceeds by plus count operation from initial value signal, and here, the initial value signal is designated as ginseng
No-voltage is examined, Vref0 is designated as, also, in the square-wave signal VdimIn period for high level effective width, the t1 in such as Fig. 4
To the t3 periods, the first counter A is carried out plus count operation with the first regulation step-length, until the square-wave signal is changed into low level
Disarmed state, i.e., at the t3 moment, the first counter A output signal is designated as the first count value；Afterwards, in the square-wave signal
At the trailing edge moment (t3 moment), first counter is proceeded by from the first current count value subtracts count operation, also,
The square-wave signal is in the period of the invalid width of low level, the t3 in such as Fig. 4 is to the t4 periods, and the first counter A is with second
Regulation step-length carries out subtracting count operation, until a cycle of the square-wave signal terminates, and the first counter A is by now
First count value is transmitted to the second counter B, and the first count value of note now is VT1；
Meanwhile, the second counter B receives the square-wave signal VdimExported with the upper counter of end cycle moment first
First count value VT1, in the rising edge time of the square-wave signal, such as t1 moment, second counter is from the first count value
VT1Proceed by and subtract count operation, also, in the period that the square-wave signal is high level effective width, the t1 in such as Fig. 4
To the t3 periods, second counter carries out subtracting count operation with the 3rd regulation step-length, until first count value is subtracted
No-voltage is as low as referred to, the output signal of the second counter is designated as the second count value VT2.Here, it is necessary to illustrate, in this reality
Apply in example, it is to be decreased to zero, example at the low level disarmed state moment that the second counter B, which is not necessarily in the square-wave signal saltus step,
Such as, in the embodiment shown in fig. 4, first count value is decreased to refer to no-voltage by the second counter B at the t2 moment.
In practical work process, first counter and the second counter are counted by the triggering of clock signal
Action, as described the first counter receive the first clock signal Timer1, first clock signal triggering along moment, institute
State the first counter and carry out plus/minus count operation；Second counter receives the second clock signal Timer2, at described second
The triggering of clock signal is along the moment, and second counter carries out subtracting count operation.
Afterwards, within a work period of the square-wave signal, the comparison circuit (being specially comparator A1) receives
The second count value VT2With with reference to no-voltage Vref0, counted specifically, the positive input of the comparator receives described second
Numerical value VT2, negative input receives the reference no-voltage Vref0, after comparing processing, exports the light modulation angle dutycycle
Signal VD.Skilled person will appreciate that, in the rising edge time of the square-wave signal, first counter is by output signal
Transmit to the second counter, now, the value of the second count value is the first of the upper counter of end cycle moment first output
Count value, with reference to Fig. 4, second count value is successively decreased since the t1 moment, to the t2 moment, and second count value is decreased to ginseng
No-voltage is examined, therefore, in t1 between t2, the light modulation angle duty cycle signals are high level effective status, to t2 moment, institute
State light modulation angle duty cycle signals VDSaltus step is low level disarmed state, until next work period, when the square-wave signal
When saltus step is high level effective status again, the first count value is stored into the second counter B, and the second count value is more than ginseng again
Examine no-voltage Vref0, light modulation angle duty cycle signals VDSaltus step is high level effective status, so repeatedly.As can be known from Fig. 4,
The light modulation angle duty cycle signals are consistent with the cycle of the square-wave signal.
Finally, the mlultiplying circuit receives the light modulation angle duty cycle signals VDWith reference voltage signal Vref, to obtain
Obtain the reference signal VREF.Here, mlultiplying circuit can be multiplier or the chopper circuit being made up of switching tube.The benchmark
Voltage signal Vref is pre-set by user according to the requirement of light regulation of circuit.
From said process as can be seen that with reference to shown in Fig. 4, the first counter A carries out plus counted fortune in t1 to t3 periods
Calculate, such as increase to B points from A points, here, the note increased slope of the first count value is approximately a, in the first counter A in t3 to t4
Period progress subtracts count operation, is such as reduced to C points from B points, here, and the slope that the first count value of note reduces is approximately b, second
Counter carries out subtracting count operation in t1 to t2 periods, is such as reduced to D points from C points, and the slope that the second count value of note reduces is near
It is seemingly c.Here, the slope that the first increased slopes of counter A, the slope of the first counter A reductions, the second counter B reduce
Ratio is a：b:C, so, according to the above-mentioned circuit course of work, can obtain above-mentioned light modulation angle duty cycle signals VDDuty
Than for：
D '=((a+b) × D-b)/c
Here it is possible to which c is turned into unit 1, D is the dutycycle of the square-wave signal, and dutycycle here is referred to effectively
Width, so, light modulation angle duty cycle signals VDOnly value and square-wave signal V with a, bdimDutycycle it is related, in other words,
Control a, b value can obtain different light modulation angle duty cycle signals VD。
And according to reference signal VREFWith light modulation angle duty cycle signals VD, reference voltage signal Vref relation, benchmark electricity
It is fixed value, therefore, reference signal V to press signal VrefREFWith light modulation angle duty cycle signals VDFor linear changing relation, according to
Above-mentioned light modulation angle duty cycle signals VDCalculation formula is it is known that reference signal VREFCharacterize the phase angle letter of controllable silicon
Breath, also, because a, b parameter are can be adjusted according to the requirement of circuit, easily deduce from above-mentioned, the reference signal VREF
Size clamp 0 between Vref, it is but controllable during the change of slope.It is above-mentioned therefore, pass through above-mentioned reference signal VREFCan be with
The brightness regulation of LED load is carried out well.
In embodiments of the present invention, the increased slope a of the first counter A, the first counter A reduce slope b, the
The slope c that two counter B reduce can be adjusted according to the periodic Control of clock signal, for example, control clock signal is in difference
Pulse in added deduct operation calculating, may be such that the plus-minus slope of counter changes；Either, by directly controlling
System first adjusts the size of step-length, the second regulation step-length and the 3rd regulation step-length, to cause the plus-minus slope of counter to change
Become, so as to obtain different light modulation angle duty cycle signals VD。
Finally, feedback control circuit includes error compensation circuit and pwm control circuit, and the error compensation circuit includes missing
Poor amplifier EA and compensating electric capacity CC, the error amplifier EA receptions reference signal VREFWith sign LED load electric current
Voltage feedback signal VIFB, after error amplification and compensation deals, produce thermal compensation signal Vcomp；The pwm control circuit 23-1
The thermal compensation signal Vcomp is received, to produce the pwm control signal, the pwm control signal is to control the power stage
Power switch pipe in circuit, to carry out brightness adjustment control to LED load.Here, the pwm control circuit can by comparator and touch
The circuit that the devices such as device are constituted is sent out, comparator receives the inductive current sampled signal in the thermal compensation signal and power stage circuit,
To produce the cut-off signals of control power switch pipe, trigger receive the cut-off signals and control power switch pipe conducting when
Clock signal, to produce the pwm control signal.In addition, the pwm control circuit can also for other by compensation signal control
Timing circuit is constituted, concrete structure not limited to this.
In the foregoing circuit course of work, the compensating electric capacity of feedback compensation loop can be multiplexed to filter reference signal
Ripple processing, to obtain the V in smoother current reference value, such as Fig. 4REF_avg, therefore no longer need increase filtered electrical perhaps to enter
Row digital filtering.
Above-mentioned dimming curve generative circuit is converted to square-wave signal using counter the reference for characterizing phase angle signal
Signal, and the brightness regulation of controllable precise can be carried out, without filter capacitor of the prior art.Using the technical side of the present invention
Case method is simple and saves circuit cost and pin resource, beneficial to the encapsulation of chip.
The invention also discloses a kind of LED light-dimming methods with controllable silicon, one according to the present invention is shown with reference to Fig. 5
The flow chart of the LED light-dimming methods with controllable silicon is planted, the LED light-dimming methods are applied in LED light adjusting circuits, and the LED is adjusted
Optical circuit includes controllable silicon, rectifier bridge, power stage circuit and adjusting control circuit, and external input voltage passes through controllable silicon and whole
Obtain the DC input voitage of a phase shortage after stream bridge processing, the power stage circuit receive the DC input voitage of the phase shortage with
Suitable output voltage supply LED load is converted to, is comprised the following steps：
S501：The d.c. input voltage signal of the phase shortage is received, to obtain the phase angle information for characterizing the controllable silicon
Square-wave signal；
S502：The square-wave signal is received, adjustment is controlled by the dutycycle to the square-wave signal, can with acquisition
The light modulation angle duty cycle signals of control, letter is referred to according to the light modulation angle duty cycle signals and reference voltage signal to generate
Number；
S503：Receive the reference signal and characterize the voltage feedback signal of LED load electric current, to produce PWM control letters
Number, the pwm control signal is to control the power switch pipe in the power stage circuit, to carry out light modulation control to LED load
System.
The specific steps that the reference signal is produced include：
The square-wave signal and initial value signal are received, in a cycle of the square-wave signal, in square wave letter
Number it is the period of high level effective width, the initial value signal is carried out plus count operation with the first regulation step-length, up to institute
State square-wave signal and be changed into low level disarmed state, export the first count value, be the invalid width of low level in the square-wave signal
In period, the first current count value is carried out subtracting count operation with the second regulation step-length, until one of the square-wave signal
End cycle, the first count value of storage this moment；
Meanwhile, in a cycle of the square-wave signal, in the period that the square-wave signal is high level effective width
In, the first count value that the upper end cycle moment is exported carries out subtracting count operation with the 3rd regulation step-length, until will be described
First count value is decreased to refer to no-voltage, exports the second count value；
Compare second count value and refer to no-voltage, export the light modulation angle duty cycle signals；
The light modulation angle duty cycle signals are multiplied with the reference voltage signal, to generate the reference signal.
Further, the size of the first regulation step-length, the second regulation step-length and the 3rd regulation step-length is adjusted to obtain
Different light modulation angle duty cycle signals.
The LED light adjusting circuits with controllable silicon and light-dimming method according to the preferred embodiments of the present invention have been carried out in detail above
Description to the greatest extent, those of ordinary skill in the art can deduce other technologies or structure and circuit layout, element etc. accordingly
Applied to the embodiment.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, not yet
It is only described specific embodiment to limit the invention.Obviously, as described above, it can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle and practical application of the present invention, so that affiliated
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its four corner and equivalent.
Claims (11)
1. a kind of LED light adjusting circuits with controllable silicon, include controllable silicon, rectifier bridge, power stage circuit and brightness adjustment control
Circuit, external input voltage obtains the DC input voitage of a phase shortage, the power stage after controllable silicon and rectifier bridge processing
Circuit receives the DC input voitage of the phase shortage to be converted to suitable output voltage supply LED load, it is characterised in that institute
Stating adjusting control circuit includes light modulation angle detection circuitry, dimming curve generative circuit and feedback control circuit,
The light modulation angle detection circuitry receives the d.c. input voltage signal of the phase shortage, and the controllable silicon is characterized to obtain
The square-wave signal of phase angle information；
The dimming curve generative circuit receives the square-wave signal, is controlled by the effective width to the square-wave signal
Adjustment, to obtain the light modulation angle duty cycle signals that effective width is controllable, the light modulation angle duty cycle signals and the square wave
The cycle of signal is consistent, and the dimming curve generative circuit is according to the light modulation angle duty cycle signals and reference voltage signal
To generate reference signal；
The feedback control circuit receives the reference signal and characterizes the voltage feedback signal of LED load electric current, to produce PWM
Control signal, the pwm control signal is to control the power switch pipe in the power stage circuit, to be carried out to LED load
Brightness adjustment control；
The dimming curve generative circuit includes the first counter, the second counter, comparison circuit and mlultiplying circuit,
First counter receives the square-wave signal, in the rising edge time of the square-wave signal, first counter
Proceeded by from initial value signal plus count operation, also, in the period that the square-wave signal is high level effective width, institute
The first counter is stated to carry out plus count operation with the first regulation step-length, until the square-wave signal is changed into low level disarmed state,
The output signal of first counter is designated as the first count value；At the trailing edge moment of the square-wave signal, first meter
Number device is proceeded by from the first current count value subtracts count operation, also, is the invalid width of low level in the square-wave signal
Period in, first counter with second regulation step-length carry out subtract count operation, until the square-wave signal a week
Phase terminates, and first counter transmits the first count value this moment to second counter；
Second counter receives the square-wave signal and the first of the output of the upper counter of end cycle moment first and counted
Value, in the rising edge time of the square-wave signal, second counter is proceeded by from first count value subtracts counting fortune
Calculate, also, in the square-wave signal in the period of high level effective width, second counter is entered with the 3rd regulation step-length
Row subtracts count operation, until first count value is decreased to refer to no-voltage, the output signal note of second counter
For the second count value；
The comparison circuit is connected to receive second count value, the comparison circuit with the output end of second counter
Also receive and refer to no-voltage, after comparing processing, export the light modulation angle duty cycle signals；
The mlultiplying circuit receives the light modulation angle duty cycle signals and the reference voltage signal, described with reference to letter to generate
Number.
2. LED light adjusting circuits according to claim 1, it is characterised in that first counter is in the square-wave signal
Rising edge time, the output signal in a upper cycle was zeroed out, to recover to the initial value signal.
3. LED light adjusting circuits according to claim 1, it is characterised in that the initial value signal refers to zero equal to described
Voltage.
4. LED light adjusting circuits according to claim 1, it is characterised in that regulation the first regulation step-length, the second regulation
Step-length and the 3rd adjusts the size of step-length to obtain different light modulation angle duty cycle signals.
5. LED light adjusting circuits according to claim 1, it is characterised in that first counter receives the first clock letter
Number, first clock signal triggering along the moment, first counter carries out plus/minus count operation；
Second counter receives second clock signal, the second clock signal triggering along the moment, second meter
Number device carries out subtracting count operation.
6. LED light adjusting circuits according to claim 5, it is characterised in that when adjusting first clock signal or second
The cycle of clock signal is to obtain different light modulation angle duty cycle signals.
7. LED light adjusting circuits according to claim 1, it is characterised in that the feedback control circuit includes error compensation
Circuit and pwm control circuit,
The error compensation circuit receives the voltage feedback signal and reference signal, after error amplification and compensation deals, production
Raw thermal compensation signal；
The pwm control circuit receives the thermal compensation signal, to produce the pwm control signal.
8. a kind of LED light-dimming methods with controllable silicon, applied in LED light adjusting circuits, the LED light adjusting circuits include
Controllable silicon, rectifier bridge, power stage circuit and adjusting control circuit, external input voltage is after controllable silicon and rectifier bridge processing
The DC input voitage of a phase shortage is obtained, it is suitable to be converted to that the power stage circuit receives the DC input voitage of the phase shortage
Output voltage supply LED load, it is characterised in that comprise the following steps：
The d.c. input voltage signal of the phase shortage is received, is believed with the square wave for obtaining the phase angle information for characterizing the controllable silicon
Number；
The square-wave signal is received, adjustment is controlled by the dutycycle to the square-wave signal, to obtain controllable light modulation
Angle duty cycle signals, according to the light modulation angle duty cycle signals and reference voltage signal to generate reference signal；
Receive the reference signal and characterize the voltage feedback signal of LED load electric current, to produce pwm control signal, the PWM
Control signal is to control the power switch pipe in the power stage circuit, to carry out brightness adjustment control to LED load；
The specific steps that the reference signal is produced include：
The square-wave signal and initial value signal are received, in a cycle of the square-wave signal, is in the square-wave signal
The period of high level effective width, the initial value signal is carried out plus count operation with the first regulation step-length, until the side
Ripple signal is changed into low level disarmed state, exports the first count value, in the period that the square-wave signal is the invalid width of low level
In, the first current count value is carried out subtracting count operation with the second regulation step-length, until a cycle of the square-wave signal
Terminate, the first count value of storage this moment；
Meanwhile,, will in the period that the square-wave signal is high level effective width in a cycle of the square-wave signal
First count value of upper end cycle moment output carries out subtracting count operation with the 3rd regulation step-length, until described first is counted
Numerical value is decreased to refer to no-voltage, exports the second count value；
Compare second count value and refer to no-voltage, export the light modulation angle duty cycle signals；
The light modulation angle duty cycle signals are multiplied with the reference voltage signal, to generate the reference signal.
9. LED light-dimming methods according to claim 8, it is characterised in that regulation the first regulation step-length, the second regulation
Step-length and the 3rd adjusts the size of step-length to obtain different light modulation angle duty cycle signals.
10. LED light-dimming methods according to claim 8, it is characterised in that produce first meter using the first counter
Numerical value, first counter receives the first clock signal, first clock signal triggering along the moment, first meter
Number device carries out plus/minus count operation；
Second count value is produced using the second counter, second counter receives second clock signal, described the
The triggering of two clock signals is along the moment, and second counter carries out subtracting count operation.
11. LED light-dimming methods according to claim 10, it is characterised in that regulation first clock signal or second
The cycle of clock signal is to obtain different light modulation angle duty cycle signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510320369.5A CN104902648B (en) | 2015-06-11 | 2015-06-11 | A kind of LED light adjusting circuits and light-dimming method with controllable silicon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510320369.5A CN104902648B (en) | 2015-06-11 | 2015-06-11 | A kind of LED light adjusting circuits and light-dimming method with controllable silicon |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104902648A CN104902648A (en) | 2015-09-09 |
| CN104902648B true CN104902648B (en) | 2017-08-25 |
Family
ID=54034956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510320369.5A Active CN104902648B (en) | 2015-06-11 | 2015-06-11 | A kind of LED light adjusting circuits and light-dimming method with controllable silicon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104902648B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105792436B (en) * | 2016-04-21 | 2017-07-11 | 矽力杰半导体技术(杭州)有限公司 | The controller and Switching Power Supply of Switching Power Supply |
| CN106028511B (en) * | 2016-05-30 | 2017-12-29 | 上海典芯半导体有限公司 | A kind of LED stepless dimmings system |
| CN106569434A (en) * | 2016-08-31 | 2017-04-19 | 宝鸡中发石油机械有限责任公司 | Encoder type control handle |
| US10645769B2 (en) | 2017-07-14 | 2020-05-05 | Lutron Technology Company Llc | Configuration for a load regulation device for lighting control |
| CN108307556A (en) * | 2017-12-29 | 2018-07-20 | 杭州士兰微电子股份有限公司 | Mean value circuit, LED drive device and its control method |
| CN109412582B (en) * | 2018-12-10 | 2024-05-03 | 珠海一微半导体股份有限公司 | PWM signal sampling detection circuit, processing circuit and chip |
| CN109496014A (en) * | 2018-12-12 | 2019-03-19 | 上海新进半导体制造有限公司 | LED light adjusting circuit and LED drive system |
| CN110572900A (en) * | 2019-08-23 | 2019-12-13 | 南通金茂电子科技有限公司 | novel LED dimming drive circuit |
| CN111276212A (en) * | 2020-01-17 | 2020-06-12 | 卫莱医疗有限公司 | Massager set |
| CN113179565B (en) * | 2021-05-06 | 2024-01-12 | 上海奥简微电子科技有限公司 | LED silicon controlled rectifier dimming depth compensation circuit and LED lighting device |
| CN114423117A (en) * | 2021-12-16 | 2022-04-29 | 广州裕芯电子科技有限公司 | LED brightness subsection control circuit and LED brightness subsection control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497706A (en) * | 2011-12-15 | 2012-06-13 | 成都芯源系统有限公司 | LED driving device and driving method and controller |
| CN103731151A (en) * | 2014-01-15 | 2014-04-16 | 南京矽力杰半导体技术有限公司 | Method and circuit for converting duty ratio into analog signal |
| CN103857141A (en) * | 2012-12-05 | 2014-06-11 | 艾尔瓦特集成电路科技（天津）有限公司 | LED driver controller, LED driver and LED drive method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7498754B2 (en) * | 2007-04-02 | 2009-03-03 | Supertex, Inc. | Architecture for driving multiple loads at constant current |
-
2015
- 2015-06-11 CN CN201510320369.5A patent/CN104902648B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102497706A (en) * | 2011-12-15 | 2012-06-13 | 成都芯源系统有限公司 | LED driving device and driving method and controller |
| CN103857141A (en) * | 2012-12-05 | 2014-06-11 | 艾尔瓦特集成电路科技（天津）有限公司 | LED driver controller, LED driver and LED drive method |
| CN103731151A (en) * | 2014-01-15 | 2014-04-16 | 南京矽力杰半导体技术有限公司 | Method and circuit for converting duty ratio into analog signal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104902648A (en) | 2015-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104902648B (en) | A kind of LED light adjusting circuits and light-dimming method with controllable silicon | |
| CN105356730B (en) | Error amplification device and the drive circuit for including the error amplification device | |
| US8670255B2 (en) | Utilization of a multifunctional pin combining voltage sensing and zero current detection to control a switched-mode power converter | |
| CN103580000B (en) | Switching Power Supply output over-voltage protection method and circuit and the Switching Power Supply with this circuit | |
| US9577543B2 (en) | Constant on time (COT) control in isolated converter | |
| US20120025919A1 (en) | Synchronization of multiple high frequency switching power converters in an integrated circuit | |
| TWI499183B (en) | Power factor correction circuit of power converter | |
| CN102740571A (en) | Dimmable LED (Light-Emitting Diode) driving circuit and driving method | |
| US20160079875A1 (en) | Constant on time cot control in isolated converter | |
| CN109951925A (en) | Adjustable resistance and its current ripples of application eliminate circuit and line voltage compensation circuit | |
| CN106655777A (en) | Switching power supply output cable pressure drop compensating circuit and compensating method | |
| US20160079874A1 (en) | Constant on-time (cot) control in isolated converter | |
| CN108933529A (en) | Power supply control device and power supply control system | |
| TWI608693B (en) | Voltage detection method and circuit and switching power supply with voltage detection circuit | |
| CN103414357A (en) | Drive circuit, regulated by load voltage, of source end controlling constant current output power | |
| US9548667B2 (en) | Constant on-time (COT) control in isolated converter | |
| US9577542B2 (en) | Constant on-time (COT) control in isolated converter | |
| CN106026650B (en) | A kind of offset voltage eliminates circuit | |
| CN106961216B (en) | Novel constant exports electric current BUCK circuit | |
| CN103533710B (en) | A kind of LED driver | |
| WO2016044489A1 (en) | Constant on-time (cot) control in isolated converter | |
| EP3278439B1 (en) | Constant on-time (cot) control in isolated converter | |
| CN104065249B (en) | Input voltage real-time sampling circuit and method suitable for secondary side control DC/DC converter | |
| CN206226795U (en) | Error amplification device and the drive circuit comprising the error amplification device | |
| CN205232016U (en) | Error magnification device and drive circuit who contains said error magnification device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 Wensanlu Road, Hangzhou Province, No. 90 East Software Park, science and technology building A1501 Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |
|
| CP02 | Change in the address of a patent holder |