CN105120575A - LED wide-scope accurate light modulation circuit - Google Patents
LED wide-scope accurate light modulation circuit Download PDFInfo
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- CN105120575A CN105120575A CN201510598894.3A CN201510598894A CN105120575A CN 105120575 A CN105120575 A CN 105120575A CN 201510598894 A CN201510598894 A CN 201510598894A CN 105120575 A CN105120575 A CN 105120575A
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Abstract
The invention relates to an LED wide-scope accurate light modulation circuit which belongs to the technical field of lighting circuits with the object of increasing light modulation precision and expanding a modulation scope. The circuit comprises a constant current power supply, a light modulation unit, and a light modulation mode switching unit. The light modulation unit comprises a linear light modulation module which outputs a linear light modulation signal when the voltage value of an external light modulation signal is greater than or equal to N and a PWM light modulation module which outputs a PWM light modulation signal when the voltage value of the external light modulation signal is smaller than N. The light modulation mode switching unit is used to receive the light modulation signals outputted from the linear light modulation module and the PWM light modulation module and transmit the light modulation signals to the adjusting end pin of the constant current power supply. The light modulation circuit provided by the invention is suitable to modulate light of an LED lighting circuit.
Description
Technical field
The present invention relates to lighting circuit technology, particularly relate to the technology of the accurate light adjusting circuit of a kind of LED wide region.
Background technology
The output of LED drive power is a constant-current source, and different power values correspond to different light-source brightness.For the application of not light modulation, the output current of driving power is set in a pre-set fixed value, can not change.Like this control of LED lamp is just only opened and closed two states.When needs light modulation, existing conventional dimming mode controls output current exactly, has the method that two the most frequently used, is that Linear Control light modulation and PWM control light modulation respectively.
Linear Control light modulation is exactly using the fixed value preset as maximum (i.e. 100% brightness), regulates downwards on this basis.Under this mode, power supply is still operated in constant-current source pattern, and just the setting of output current changes with the requirement of light modulation.The operation principle of Linear Control light modulation as shown in Figure 4, constant-current supply U411 is converted to constant current input voltage S410 and exports, the output current of constant-current supply U411 is subject to the output signal control of amplifier adjustment module U412, the input signal of amplifier adjustment module U412 first input end is dim signal S411, what dim signal S411 represented is the set point of constant-current supply U411 output current, when dim signal S411 opens a way, amplifier adjustment module U412 first input end is pulled upward to Vref (Vref is the voltage reference value of corresponding maximum output current) here through pull-up resistor Rp411, the input signal of amplifier adjustment module U412 second input is the voltage (representing the actual output voltage of constant-current supply U411) on sampling resistor Rs411.When stable state, amplifier adjustment module U412 is consistent by negative feedback the voltage-regulation of two inputs, and such actual output current is just followed the change of dim signal S411 and changes.Cout411 in Fig. 4 is the output capacitance of constant-current supply, is the common output circuit of general Switching Power Supply.
It is exactly when current setting value is constant that PWM controls light modulation, in output PWM mode, copped wave process is carried out to output current, so in fact change the output characteristic of constant-current source, instantaneous output current or maximum, or 0, its mean value is then according to the duty ratio depending on PWM.Due to visual persistence effect, when the frequency of PWM is enough high, human eye can not perceive the saltus step in brightness, generally frequency setting at more than 200Hz.In specific implementation, the copped wave process of output current is by allowing and forbidding that the mode of PWM controller work realizes.After normal operation, forbid the output that PWM controls, will output current be caused to reduce to 0, then allow the output that PWM controls, output current will be caused to rise to rated value, and such output current just shows as the waveform of chopped mode.PWM controls the operation principle of light modulation as shown in Figure 5, constant-current supply U521 is converted to constant current input voltage S520 and exports, compared with Linear Control light modulation (Fig. 4), the dim signal S521 that PWM controls light modulation does not receive on amplifier adjustment module U522, the first input end of amplifier adjustment module U522 is pulled upward to Vref through pull-up resistor Rp521, the input signal of amplifier adjustment module U522 second input is the voltage on sampling resistor Rs521, dim signal S521 is a pwm signal, this signal follows the input of amplifier adjustment module by carrying out logical AND with door U523, the output current of constant-current supply U521 is subject to controlling with the output signal of door U523, when dim signal S521 is " 1 ", control signal is exactly the output of amplifier adjustment module U522, when dim signal S521 is " 0 ", control signal is 0, mean that output current is 0, the frequency of dim signal is generally between 200Hz to 1kHz.Cout521 in Fig. 5 is the output capacitance of constant-current supply, is the common output circuit of general Switching Power Supply.
Above two kinds of dimming modes are all the modes generally adopted, and respectively have quality.Linearity light adjusting implementation is fairly simple, but requirement of light regulation lower than 10% time, precision is generally poor.PWM mode passes through duty cycle adjustment output current, because duty ratio precision is high, and can be better than linear mode in precision; But after duty ratio diminishes, the proportion that the rising and falling time of waveform accounts for increases, and the error caused will be more and more obvious thereupon; Another problem of this mode is the waveform that output current actual waveform becomes chopped mode, and therefore the EMI characteristic of power supply can be deteriorated.
In addition, above two kinds of dimming modes also also exist the narrow problem of dimming scope, these two kinds of dimming modes can only carry out accurate adjustment to the output current of constant-current supply in 10% ~ 100% scope of constant-current supply rated current above, in some particular application, such dimming scope is too coarse, but due to output current lower, the stability of power supply own is poorer, degree of regulation is also poorer, and therefore in a lot of situation, 10% has been that power supply can keep the lower limit of fine adjustment.
Summary of the invention
For the defect existed in above-mentioned prior art, it is high that technical problem to be solved by this invention is to provide a kind of light modulation precision, and the accurate light adjusting circuit of LED wide region that adjustable range is wide.
In order to solve the problems of the technologies described above, the accurate light adjusting circuit of a kind of LED wide region provided by the present invention, comprises constant-current supply, dimming unit, and described constant-current supply has the adjustable side pin for controlling output current and the feedback end pin for feeding back output current; It is characterized in that: also comprise dimming mode switch unit;
Described dimming unit comprises linearity light adjusting module, PWM light-adjusting module, and the input of described linearity light adjusting module, PWM light-adjusting module connects external dimmer signal respectively;
Described linearity light adjusting module is used for the output linearity dim signal when the magnitude of voltage of outside dim signal is more than or equal to N, and stopping output linearity dim signal when the magnitude of voltage of outside dim signal is less than N, the feedback signal input terminal of linearity light adjusting module receives the feedback end pin of constant-current supply;
Described PWM light-adjusting module is used for exporting PWM dim signal when the magnitude of voltage of outside dim signal is less than N, and stops when the magnitude of voltage of outside dim signal is more than or equal to N exporting PWM dim signal;
The value of described N is greater than 0 and is less than the output current rating of constant-current supply;
Described dimming mode switch unit has an output and two inputs, the output of dimming mode switch unit receives the adjustable side pin of constant-current supply, and the dim signal output of linearity light adjusting module and PWM light-adjusting module receives two inputs of dimming mode switch unit respectively;
Described dimming mode switch unit is for receiving the dim signal of linearity light adjusting module and the output of PWM light-adjusting module, and when receiving the linearity light adjusting signal from linearity light adjusting module, linearity light adjusting signal from linearity light adjusting module is forwarded to the adjustable side pin of constant-current supply, when receiving the PWM dim signal from PWM light-adjusting module, the PWM dim signal from PWM light-adjusting module is forwarded to the adjustable side pin of constant-current supply.
Further, described linearity light adjusting module comprises the first reference voltage signal source, amplifier adjustment module, clipping module;
The input termination external dimmer signal of described clipping module, the output of clipping module receives the normal phase input end of amplifier adjustment module; The normal phase input end of described amplifier adjustment module receives the first reference voltage signal source, and the negative-phase input of amplifier adjustment module receives the feedback end pin of constant-current supply, and the output of amplifier adjustment module forms the dim signal output of linearity light adjusting module.
Further, described PWM light-adjusting module comprises Saw-tooth Signal Waveform Generator, the first comparator; The normal phase input end of described first comparator connects external dimmer signal, and the negative-phase input of the first comparator connects the sawtooth signal output of Saw-tooth Signal Waveform Generator, and the output of the first comparator forms the dim signal output of PWM light-adjusting module.
Further, the second reference voltage signal source, the second comparator is also comprised;
The output of described first comparator receives dimming mode switch unit by one with door, should input the output of termination first comparator with of door, and this another with door inputs the output of termination second comparator;
The normal phase input end of described second comparator connects external dimmer signal, and the negative-phase input of the second comparator receives the second reference voltage signal source.
Further, described dimming mode switch unit is one and door.
The accurate light adjusting circuit of LED wide region provided by the invention, Linear Control and PWM has been concentrated to control the advantage of two kinds of modes, and overcome the shortcoming of these two kinds of modes, greatly can widen the lower limit of dimming scope, light modulation precision can also be ensured simultaneously, thus meet the needs of particular application, there is light modulation precision high, the feature that adjustable range is wide.
Accompanying drawing explanation
Fig. 1 is the circuit structure block diagram of the accurate light adjusting circuit of LED wide region of first embodiment of the invention;
Fig. 2 is the circuit diagram of the accurate light adjusting circuit of LED wide region of first embodiment of the invention;
Fig. 3 is the circuit diagram of the accurate light adjusting circuit of LED wide region of second embodiment of the invention;
Fig. 4 is the electrical block diagram of existing Linear Control light adjusting circuit;
Fig. 5 is the electrical block diagram that existing PWM controls light adjusting circuit.
Embodiment
Illustrate below in conjunction with accompanying drawing and embodiments of the invention are described in further detail; but the present embodiment is not limited to the present invention; every employing analog structure of the present invention and similar change thereof, all should list protection scope of the present invention in, the pause mark in the present invention all represent and relation.
As shown in Figure 1, the accurate light adjusting circuit of a kind of LED wide region that first embodiment of the invention provides, comprise constant-current supply U1, dimming unit U2, described constant-current supply U1 has the adjustable side pin for controlling output current and the feedback end pin for feeding back output current; It is characterized in that: also comprise dimming mode switch unit U3;
Described dimming unit U2 comprises linearity light adjusting module U21, PWM light-adjusting module U22, and the input of described linearity light adjusting module, PWM light-adjusting module meets external dimmer signal S1 respectively;
Described linearity light adjusting module U21 is used for the output linearity dim signal when the magnitude of voltage of outside dim signal S1 is more than or equal to N, and stopping output linearity dim signal when the magnitude of voltage of outside dim signal S1 is less than N, the feedback signal input terminal of linearity light adjusting module U21 receives the feedback end pin of constant-current supply U1;
Described PWM light-adjusting module U22 is used for exporting PWM dim signal when the magnitude of voltage of outside dim signal S1 is less than N, and stops when the magnitude of voltage of outside dim signal S1 is more than or equal to N exporting PWM dim signal;
The value of described N is greater than 0 and is less than the output current rating of constant-current supply U1;
Described dimming mode switch unit U3 has an output and two inputs, the output of dimming mode switch unit U3 receives the adjustable side pin of constant-current supply U1, and the dim signal output of linearity light adjusting module U21 and PWM light-adjusting module U22 receives two inputs of dimming mode switch unit U3 respectively;
Described dimming mode switch unit U3 is for receiving the dim signal of linearity light adjusting module and the output of PWM light-adjusting module, and when receiving the linearity light adjusting signal from linearity light adjusting module U21, linearity light adjusting signal from linearity light adjusting module U21 is forwarded to the adjustable side pin of constant-current supply U1, when receiving the PWM dim signal from PWM light-adjusting module U22, the PWM dim signal from PWM light-adjusting module U22 is forwarded to the adjustable side pin of constant-current supply U1.
As shown in Figure 2, in first embodiment of the invention, the feedback end pin of described constant-current supply U1 is connected to sampling resistor Rs1, and the output of constant-current supply U1 is connected to output capacitance Cout1;
Described linearity light adjusting module U21 comprises the first reference voltage signal source (not shown), amplifier adjustment module U211, clipping module U212, the input termination external dimmer signal S1 of described clipping module U212, the output of clipping module U212 receives the normal phase input end of amplifier adjustment module U211; The normal phase input end of described amplifier adjustment module U211 receives the first reference voltage signal source through a pull-up resistor Rp1, the negative-phase input of amplifier adjustment module U211 receives the feedback end pin of constant-current supply U1, and the output of amplifier adjustment module forms the dim signal output of linearity light adjusting module;
Described PWM light-adjusting module U22 comprises Saw-tooth Signal Waveform Generator U223, the first comparator U221; The normal phase input end of described first comparator U221 meets external dimmer signal S1, the negative-phase input of the first comparator U221 connects the sawtooth signal output of Saw-tooth Signal Waveform Generator U223, and the output of the first comparator U221 forms the dim signal output of PWM light-adjusting module.
In first embodiment of the invention, also comprise the second reference voltage signal source, the second comparator U222;
The output of described first comparator U221 receives dimming mode switch unit by one with door U224, the output that should input termination first comparator U221 with one of door U224, this another with door U224 inputs the output of termination second comparator U222;
The normal phase input end of described second comparator U222 meets external dimmer signal S1, and the negative-phase input of the second comparator U222 receives the second reference voltage signal source;
Described dimming mode switch unit U3 is one and door, second input of dimming mode switch unit U3 receives the output of amplifier adjustment module U211, first input of dimming mode switch unit U3 receives the output with door U224, and the output of dimming mode switch unit U3 receives the adjustable side pin of constant-current supply U1;
If the output voltage values in the first reference voltage signal source is Vref1, the output voltage values in the second reference voltage signal source is Vref2, Vref2 is then had to be less than Vref1, the amplitude limit lower limit of clipping module is less than Vref1 and is greater than Vref2, and the output signal amplitude of Saw-tooth Signal Waveform Generator is less than Vref1 and is greater than Vref2.
In first embodiment of the invention, the output voltage values Vref2 in the second reference voltage signal source is 0.01 times of the output voltage values Vref1 in the first reference voltage signal source, the amplitude limit lower limit of clipping module U212 is 0.1 times of the output voltage values Vref1 in the first reference voltage signal source, and the output signal amplitude of Saw-tooth Signal Waveform Generator U223 is 0.1 times of the output voltage values Vref1 in the first reference voltage signal source.
The operation principle of first embodiment of the invention is as follows:
When requirement of light regulation is between 10% to 100%, carry out linearity light adjusting by adjustment current setting value; Now, external dimmer signal S1 enters amplifier adjustment module U211 by clipping module U212, clipping module U212 the lower limit set of external dimmer signal S1 at 0.1Vref1; Like this, in the dimming scope of 10% to 100%, dimming mode and linearity light adjusting completely the same, can required precision be met;
When requirement of light regulation drops to below 10%, current setting value is no longer lowered, and the substitute is by allowing and forbidding the output that PWM controls, carries out PWM control to the output current of power supply, now, the sawtooth signal Vst that the amplitude that dim signal S1 and Saw-tooth Signal Waveform Generator U223 exports is 0.1 times of Vref1 by the first comparator U221 compares, when dim signal S1 is greater than sawtooth signal Vst, the output of the first comparator U221 is high level, when dim signal S1 is less than sawtooth signal Vst, the output of the first comparator U221 is low level, the output voltage values Vref2 (namely 0.01Vref1) in dim signal S1 and the second reference voltage signal source compares by the second comparator U222, when dim signal S1 is greater than Vref2, second comparator U221 exports as high level, when dim signal S1 is less than Vref2, second comparator U222 exports as low level, the output of the first comparator U221 and the second comparator U222 with rear, then with amplifier adjustment module U211 output with as control signal, like this, in the dimming scope of 1% to 10%, dimming mode and PWM light modulation basically identical, but difference is that current setting value is the rated current of 10%, instead of the rated current of 100%, and such rising and falling time significantly reduces, thus improve precision, and the copped wave amplitude of output current drops to the rated current of 0 ~ 10% from 0 ~ 100%, the characteristic of EMI significantly takes a turn for the better, and overcomes the shortcoming of existing PWM light modulation,
When requirement of light regulation drops to below 1%, complete power cutoff exports;
First embodiment of the invention can make constant-current supply U1 stable operation in the rated current of 1%, thus makes dimming scope be extended to 1% ~ 100% from 10% ~ 100%, can meet the requirement of light regulation of wide region.
As shown in Figure 3, second embodiment of the invention is with the difference of the first embodiment: the dimming unit in the second embodiment utilize microprocessor U104 and filter circuit, amplifier adjustment module U102 coordinate the function realizing linearity light adjusting module, and utilize microprocessor U104 to realize the function of PWM light-adjusting module; Dimming mode switch unit in second embodiment is a triple gate U103;
Microprocessor U104 wherein has dim signal input pin IN, feedback signal input terminal pin Ifb, and for exporting the high-frequency PWM output pin OUT of high-frequency PWM signal, for the low frequency PWM output pin EN of output low frequency pwm signal;
The dim signal input pin IN of microprocessor U104 meets dim signal S101, feedback signal input terminal pin Ifb connects the feedback end pin of constant-current supply U101, high-frequency PWM output pin OUT connects the normal phase input end of amplifier adjustment module U102 by filter circuit, low frequency PWM output pin EN connects the Enable Pin of triple gate U103, the output of the input termination amplifier adjustment module U102 of triple gate U103, the adjustable side pin of the output termination constant-current supply U101 of triple gate U103;
Constant-current supply U101 is converted to constant current output input voltage S100 according to the requirement of current setting value, by the A/D converter of microprocessor U104, A/D conversion is carried out to dim signal S101, the voltage magnitude of dim signal S101 correspond to required light modulation intensity, its maximum amplitude is 5V, and the electric current that correspond to 100% exports;
When the voltage of dim signal S101 is less than 0.05V, when namely required constant-current supply output current is less than 1%, it is 0 that the low frequency PWM output pin EN of microprocessor U104 exports, and makes constant-current supply output current be 0;
When the voltage of dim signal S101 is between 0.05V to 0.5V, namely when required constant-current supply output current is between 1% ~ 10%, the high-frequency PWM output pin OUT of microprocessor U104 exports the high-frequency PWM signal that a duty ratio is 10%, this signal is after RC filtering, the voltage of a 0.5V is produced at the normal phase input end of amplifier adjustment module U102, export at the low frequency PWM output pin EN of microprocessor U104 the low frequency pwm signal that a duty ratio equals the voltage of dim signal S101 and the ratio of 0.5V simultaneously, the output current of such constant-current supply is exactly a PWM waveform, its peak value is the maximum current of 10%, its duty ratio is between 10% ~ 100%, consequent average current is exactly the maximum current between 1% ~ 10%, and dimming mode is at this moment PWM dimming mode,
When the voltage of dim signal S101 is greater than 0.5V, the high-frequency PWM output pin OUT of microprocessor U104 exports the high-frequency PWM signal that a duty ratio equals the voltage of dim signal S101 and the ratio of 5V, this signal is after RC filtering, a voltage consistent with the voltage of dim signal S101 is produced at the normal phase input end of amplifier adjustment module U102, allow the low frequency PWM output pin EN of microprocessor U104 export as high simultaneously, such constant-current supply is just in linearity light adjusting mode, electric current required by its output current value inputs with light modulation is consistent, also ensure that light modulation principle of the present invention is able to smooth enforcement like this.
In other embodiment of the present invention, also can adopt other the linearity light adjusting module that can realize identical function, PWM light-adjusting module.
Claims (5)
1. the accurate light adjusting circuit of LED wide region, comprises constant-current supply, dimming unit, and described constant-current supply has the adjustable side pin for controlling output current and the feedback end pin for feeding back output current; It is characterized in that: also comprise dimming mode switch unit;
Described dimming unit comprises linearity light adjusting module, PWM light-adjusting module, and the input of described linearity light adjusting module, PWM light-adjusting module connects external dimmer signal respectively;
Described linearity light adjusting module is used for the output linearity dim signal when the magnitude of voltage of outside dim signal is more than or equal to N, and stopping output linearity dim signal when the magnitude of voltage of outside dim signal is less than N, the feedback signal input terminal of linearity light adjusting module receives the feedback end pin of constant-current supply;
Described PWM light-adjusting module is used for exporting PWM dim signal when the magnitude of voltage of outside dim signal is less than N, and stops when the magnitude of voltage of outside dim signal is more than or equal to N exporting PWM dim signal;
The value of described N is greater than 0 and is less than the output current rating of constant-current supply;
Described dimming mode switch unit has an output and two inputs, the output of dimming mode switch unit receives the adjustable side pin of constant-current supply, and the dim signal output of linearity light adjusting module and PWM light-adjusting module receives two inputs of dimming mode switch unit respectively;
Described dimming mode switch unit is for receiving the dim signal of linearity light adjusting module and the output of PWM light-adjusting module, and when receiving the linearity light adjusting signal from linearity light adjusting module, linearity light adjusting signal from linearity light adjusting module is forwarded to the adjustable side pin of constant-current supply, when receiving the PWM dim signal from PWM light-adjusting module, the PWM dim signal from PWM light-adjusting module is forwarded to the adjustable side pin of constant-current supply.
2. the accurate light adjusting circuit of LED wide region according to claim 1, is characterized in that: described linearity light adjusting module comprises the first reference voltage signal source, amplifier adjustment module, clipping module;
The input termination external dimmer signal of described clipping module, the output of clipping module receives the normal phase input end of amplifier adjustment module; The normal phase input end of described amplifier adjustment module receives the first reference voltage signal source, and the negative-phase input of amplifier adjustment module receives the feedback end pin of constant-current supply, and the output of amplifier adjustment module forms the dim signal output of linearity light adjusting module.
3. the accurate light adjusting circuit of LED wide region according to claim 1, is characterized in that: described PWM light-adjusting module comprises Saw-tooth Signal Waveform Generator, the first comparator; The normal phase input end of described first comparator connects external dimmer signal, and the negative-phase input of the first comparator connects the sawtooth signal output of Saw-tooth Signal Waveform Generator, and the output of the first comparator forms the dim signal output of PWM light-adjusting module.
4. the accurate light adjusting circuit of LED wide region according to claim 3, is characterized in that: also comprise the second reference voltage signal source, the second comparator;
The output of described first comparator receives dimming mode switch unit by one with door, should input the output of termination first comparator with of door, and this another with door inputs the output of termination second comparator;
The normal phase input end of described second comparator connects external dimmer signal, and the negative-phase input of the second comparator receives the second reference voltage signal source.
5. the accurate light adjusting circuit of LED wide region according to Claims 2 or 3, is characterized in that: described dimming mode switch unit is one and door.
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| CN109413805B (en) * | 2018-12-06 | 2024-04-09 | 欧普照明股份有限公司 | Non-isolated dimming constant-current power supply and control system |
| CN111542148A (en) * | 2020-04-27 | 2020-08-14 | 深圳深爱半导体股份有限公司 | LED driving module |
| CN111542148B (en) * | 2020-04-27 | 2021-12-28 | 深圳深爱半导体股份有限公司 | LED driving module |
| CN114698178A (en) * | 2020-12-30 | 2022-07-01 | 华润微集成电路(无锡)有限公司 | LED dimming circuit |
| CN114698178B (en) * | 2020-12-30 | 2022-11-22 | 华润微集成电路(无锡)有限公司 | LED dimming circuit |
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Effective date of registration: 20170822 Address after: 261000 No. 2, Central Road, comprehensive bonded area, Shandong, Weifang Applicant after: Shandong Zhongda Power Technology Co., Ltd. Address before: 200331 room 1, building 339, No. 1035, Lane 1203, Qilian Road, Putuo District, Shanghai Applicant before: SHANGHAI HONGYU ELECTRIC TECHNOLOGY CO., LTD. |
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Application publication date: 20151202 |