CN105792441A - Linear constant-current circuit for light modulation of silicon controlled rectifier - Google Patents
Linear constant-current circuit for light modulation of silicon controlled rectifier Download PDFInfo
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- CN105792441A CN105792441A CN201610278037.XA CN201610278037A CN105792441A CN 105792441 A CN105792441 A CN 105792441A CN 201610278037 A CN201610278037 A CN 201610278037A CN 105792441 A CN105792441 A CN 105792441A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- 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]
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Abstract
The invention belongs to the field of LED control, and mainly discloses a linear constant-current circuit for light modulation of a silicon controlled rectifier. Three sets of linear constant-current modules are combined with two sets of LED lamp strings. Furthermore current adjusting resistors with different resistances are arranged according to the positions of the three sets of linear constant-current modules in a circuit, thereby adaptively parallelly connecting or serially connecting the two sets of LED lamp strings according to the magnitude of the input voltage. The linear constant-current circuit has advantages of effectively improving utilization rate of the LED lamp strings, increasing light modulation range of the silicon controlled rectifier, ensuring high operation efficiency of the circuit and reducing circuit loss.
Description
Technical field
The invention belongs to LED control field, particularly to a kind of linear constant current circuit for controllable silicon light modulation.
Background technology
LED high-voltage linear constant current technology is simple with its scheme, with low cost, be increasingly widely applied without high frequency transformer with without advantages such as EMC problems, and progressively applies in LED controllable silicon light modulation.
The existing linear constant current circuit being applied to LED controllable silicon light modulation of existing market, as shown in Figure 1, one controllable silicon dimmer 101 of input ac voltage source electrical series, it is connected to two inputs of rectifier bridge 102, LED string 105 anode it is electrically connected after the rectification of rectified bridge 102, LED string 105 negative terminal is electrically connected main control chip 103, the electric current flowing through LED string 105 is determined by main control chip 103 and current regulating resistance 104, and maintenance electric current control chip 106 and maintenance current regulating resistance 107 provide the maintenance electric current of controllable silicon light modulation.Circuit needs the conduction voltage drop V of LED string 105LEDThe busbar voltage V obtained after matched rectified bridge 102 rectified input voltageLINE, otherwise VLEDMuch smaller than VLINETime, circuit efficiency can be extremely low, and main control chip 103 to bear sizable loss, and the consequence brought is that chip is hot seriously, affects normal circuit operation, even can damage.
If the conduction voltage drop V of LED string 105LEDCan matched input voltage VLINE, efficiency can accomplish more than 90%, but now has the light modulation problem that angle is little, dimming scope is low, LED string 105 utilization rate is low.As shown in Fig. 2 (a), busbar voltage VLINEObtaining after AC-input voltage rectified bridge 102 rectification, be a half-sinusoid, amplitude changes with the change of phase angle α, and for ease of setting forth, α here takes and is analyzed between 0 to 180 °, VLINEAmplitude is equal to VLEDTime phase angle be designated as α0, by the symmetry of half-sinusoid, the phase angle that another amplitude is equal is 180 ° of-α0；Phase angle is at α0With 180 ° of-α0Between time, VLINEAmplitude is higher than VLED, LED string 105 is lighted, and exports electric current IOUT.All the other times, LED string 105 is not lit.Within a half-sinusoid cycle, the LED quantity that LED string 105 seals in is more many, VLEDCloser to VLINEAmplitude, the efficiency of whole circuit can be more high, but the time that LED string 105 is lit is more short, and utilization rate is more low.
Owing to LED string 105 is at α0With 180 ° of-α0Between time just can be lit, so the scope that really can dim of controllable silicon dimmer 101 is also only at α0With 180 ° of-α0Between, as shown in Fig. 2 (b), once the corner cut β of controllable silicon dimmer 101 is more than 180 ° of-α0, LED string 105 extinguishes, and does not possess dimming function.Within a half-sinusoid cycle, VLEDCloser to VLINEAmplitude, the dimming scope of controllable silicon dimmer 101 is more narrow.
When controllable silicon dimmer 101 dims, the whole LED string 105 output current average within a half-sinusoid cycle is with the corner cut β curve chart changed such as shown in Fig. 2 (c).
In sum, the existing linear constant current circuit being applied to LED controllable silicon light modulation of existing market, LED string is with the number needs matched input voltage sealing in LED: the LED quantity sealed in is more low, and loss is more big, even can affect the normal operation of electric current；The LED quantity sealed in is more high, and LED string utilization rate is more low, and the dimming scope of controllable silicon light modulation is more narrow.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides one and is effectively improved efficiency, reduces loss, increases the linear constant current circuit of the controllable silicon light modulation of the dimming scope of controllable silicon light modulation.
Technical scheme: the invention provides a kind of linear constant current circuit for controllable silicon light modulation, controllable silicon dimmer, rectifier bridge, the first linear constant current chip, the first current regulating resistance, the second linear constant current chip, the second current regulating resistance, third linear constant current chip, the 3rd current regulating resistance, diode, the first LED string, the second LED string and maintenance current regulating module；Described controllable silicon dimmer and AC-input voltage source electrical series；Two inputs of rectifier bridge are electrically connected with controllable silicon dimmer and AC-input voltage source respectively；The first linear OUT terminal of constant current chip and the positive output end of rectifier bridge are electrically connected；The REXT end of one end of the first current regulating resistance and the first linear constant current chip is electrically connected；The other end of the first current regulating resistance is electrically connected with the GND end of the first linear constant current chip, the OUT terminal of the second linear constant current chip and the anode of the first LED string respectively；The REXT end of the second linear constant current chip is electrically connected with one end of the second current regulating resistance and the negative electrode of diode respectively；The GND end of the second linear constant current chip is electrically connected with the anode of the other end of the second current regulating resistance, the second LED string respectively；The negative terminal of the first LED string is electrically connected with the OUT terminal of the anode of diode and third linear constant current chip respectively；The REXT end of third linear constant current chip is electrically connected with the negative terminal of one end of the 3rd current regulating resistance, the second LED string respectively；The GND end of third linear constant current chip is electrically connected with the output negative terminal of the other end of the 3rd current regulating resistance, rectifier bridge respectively；Described maintenance current regulating module is for providing light modulation to maintain electric current to described controllable silicon dimmer.
Further, described maintenance current regulating module includes maintaining current regulating resistance, and the two ends of described maintenance current regulating resistance electrically connect with the negative electrode of diode and anode respectively.
Further, described maintenance current regulating module includes maintaining current regulating resistance and maintaining electric current control chip, and the OUT terminal electricity of described maintenance electric current control chip electrically connects with the REXT end of the first linear constant current chip；The GND end maintaining electric current control chip is electrically connected with the output negative terminal of one end and rectifier bridge of maintaining current regulating resistance respectively；The REXT end maintaining electric current control chip is electrically connected with the GND end of the other end and third linear constant current chip that maintain current regulating resistance respectively.Bigger maintenance electric current so can be provided, simultaneously can the controllable silicon dimmer of compatible more different models and broader input power range.
Further, the resistance of described first current regulating resistance is less than the resistance of the 3rd current regulating resistance, and the resistance of the second current regulating resistance is more than the resistance of the 3rd current regulating resistance.
Further, the twice that resistance is the 3rd current regulating resistance resistance of described second current regulating resistance.So equal by the size of current of two groups of LED strings, effectively raise the utilization rate of two groups of LED strings.
Further, the model of the described first linear constant current chip, the second linear constant current chip and third linear constant current chip is CL1570.
Further, the model of described maintenance electric current control chip is CL1570.
Present invention also offers a kind of linear constant current circuit for controllable silicon light modulation, controllable silicon dimmer, rectifier bridge, the first linear constant current chip, the first current regulating resistance, the second linear constant current chip, the second current regulating resistance, third linear constant current chip, the 3rd current regulating resistance, diode, the first LED string, the second LED string and maintenance current regulating module；The electric current that AC-input voltage source provides enters bus after sequentially passing through controllable silicon dimmer and rectifier bridge, when busbar voltage higher than the pressure drop of 1 lamp string lower than the pressure drop of two lamp strings series connection time, first linear constant current chip leads directly to, first LED string and the second LED connection in series-parallel are lighted, bus current is diverted to the branch road at two lamp string places, and wherein in a branch road, electric current passes sequentially through bilinear constant current chip, the second current regulating resistance and the second LED string；In another branch road, electric current passes sequentially through the first LED string and third linear constant current chip, and the output electric current of two articles of branch roads returns to rectifier bridge each through after the 3rd current regulating resistance；When busbar voltage is higher than the pressure drop of two lamp string series connection, the second linear constant current chip and third linear constant current chip do not work, and the first LED string and the series connection of the second LED string are lighted；Bus current returns to rectifier bridge after passing sequentially through the first linear constant current chip, the first current regulating resistance, the first LED string, the second current regulating resistance, diode and the second LED string；Described maintenance current regulating module is for providing light modulation to maintain electric current to described controllable silicon dimmer.
Operation principle: three groups of linear constant current modules and two groups of LED strings are combined by the present invention, two groups of LED strings the current regulating resistance of different resistance are set according to often group linear constant current module position in circuit, so that can carry out according to the height of input voltage being connected in parallel or being connected in series adaptively simultaneously.
Beneficial effect: compared with prior art, the present invention effectively raises the utilization rate of LED string, increases the dimming scope of controllable silicon light modulation, simultaneously, it is ensured that the work efficiency of circuit, reduces circuit loss.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the linear constant current circuit in prior art for LED controllable silicon light modulation；
Fig. 2 is the LED controllable silicon light modulation linear constant current work wave schematic diagram of prior art circuits；Wherein, Fig. 2 (a) is not for connecing LED string output electric current and input voltage graph of a relation during controllable silicon dimmer；LED string electric current and input voltage graph of a relation when Fig. 2 (b) is for access controllable silicon dimmer；Fig. 2 (c) is the graph of a relation of circuit output current Yu silicon controlled dimmer for light control corner cut；
Fig. 3 is the circuit diagram of embodiment 1；
Fig. 4 is as busbar voltage V in embodiment 1LINEHigher than VLEDAnd lower than 2*VLEDTime, in circuit, electric current moves towards schematic diagram；
Fig. 5 is as busbar voltage V in embodiment 1LINEHigher than 2*VLEDTime, in circuit, electric current moves towards schematic diagram；
Fig. 6 is I in embodiment 1STEP1、ISTEP2And ISTEP1、ISTEP2Superimposed lamp string output electric current IOUTWith busbar voltage VLINEThe oscillogram of change；
Fig. 7 is the graph of a relation exporting electric current and silicon controlled dimmer for light control corner cut in embodiment 1；
Fig. 8 is the circuit diagram of embodiment 2.
Detailed description of the invention
For disclosing technical scheme further, hereby it is described with reference to the accompanying drawings embodiments of the present invention.
Embodiment 1:
As shown in Figure 3, the invention provides a kind of linear constant current circuit for controllable silicon light modulation, including controllable silicon dimmer 201, rectifier bridge 202, first linear constant current chip the 203, first current regulating resistance the 204, second linear constant current chip the 205, second current regulating resistance 206, third linear constant current chip the 207, the 3rd current regulating resistance 208, diode the 209, first LED string the 210, second LED string 211 and maintenance current regulating resistance 212.
Wherein, controllable silicon dimmer 201 and AC-input voltage source electrical series；Two inputs of rectifier bridge 202 are electrically connected with controllable silicon dimmer 201 and AC-input voltage source respectively；The first linear OUT terminal of constant current chip 203 and the positive output end of rectifier bridge 202 are electrically connected；The REXT end of one end of the first current regulating resistance 204 and the first linear constant current chip 203 is electrically connected；The other end of the first current regulating resistance 204 is electrically connected with the GND end of the first linear constant current chip 203, the OUT terminal of the second linear constant current chip 205 and the anode of the first LED string 210 respectively；The REXT end of the second linear constant current chip 205 respectively with one end of the second current regulating resistance 206, diode 309 negative electrode, maintain current regulating resistance 212 one end be electrically connected；The GND end of the second linear constant current chip 205 is electrically connected with the anode of the other end of the second current regulating resistance 206, the second LED string 211 respectively；The negative terminal of the first LED string 210 is electrically connected with the anode of diode 209, the other end of maintenance current regulating resistance 212 and the OUT terminal of third linear constant current chip 207 respectively；The REXT end of third linear constant current chip 207 is electrically connected with the negative terminal of one end of the 3rd current regulating resistance 208, the second LED string 211 respectively；The GND end of third linear constant current chip 207 is electrically connected with the output negative terminal of the other end of the 3rd current regulating resistance 208, rectifier bridge 202 respectively.
First linear constant current chip the 203, second linear constant current chip 205 and third linear constant current chip 207 are single channel linear current constant control chip in the present embodiment, and can adopt model is CL1570 or similar functions chip.This chip has three function feet, respectively: OUT terminal, powers and constant current output port for chip power；GND end, for chip ground end；REXT end, arranges end for chip output current.
First LED string 210 and the model of the second sealed in LED of LED string 211 in the present embodiment, quantity are identical, and the conduction voltage drop of every cluster of lamps, ornamental string is denoted as VLED.When circuit is started working, the brightness of all lamp strings can be accomplished unanimously, when not havinging thyristor regulating light, and the problem that lamp cross luma degree differs.As shown in Figure 4, as busbar voltage VLINEPressure drop V higher than 1 lamp stringLEDAnd lower than the pressure drop 2*V of two lamp string series connectionLEDTime, the first linear constant current chip 203 leads directly to, and namely can be considered wire, and the first LED string 210 and the second LED string 211 parallel connection are lighted；Flow through the electric current I of the first LED string 211LED2Size determined by the second linear constant current chip 205 and the second current regulating resistance 206, total current I in parallelSTEP1Size determined by third linear constant current chip 207 and the 3rd current regulating resistance 208；If it is desired that the electric current I of the first LED string 210 must be flowed throughLED1With the electric current I flowing through the second LED string 211LED2Equal in magnitude, the resistance of the second current regulating resistance 206 takes the twice of the 3rd current regulating resistance 208 resistance.
As it is shown in figure 5, as busbar voltage VLINEPressure drop 2*V higher than two lamp string series connectionLEDTime, the second linear constant current chip 205 and third linear constant current chip 207 do not work, and the first LED string 210 and the series connection of the second LED string 211 are lighted；The electric current I of the first LED string 210LED1With the electric current I flowing through the second LED string 211LED2Equal in magnitude, all be series connection total current ISTEP2Size；ISTEP2Size determined by the first linear constant current chip 203 and the first current regulating resistance 204；The resistance of the first current regulating resistance 204 is less than the resistance of the 3rd current regulating resistance 208.Maintain current regulating resistance 212 to be mainly used in providing controllable silicon dimmer 201 to carry out the maintenance electric current that dims, maintain current regulating resistance 212 value and look concrete controllable silicon dimmer and different, generally can be taken between 10K Ω to 33K Ω.The value of first current regulating resistance the 204, second current regulating resistance 206 and the 3rd current regulating resistance 208 is mainly determined by the output electric current of design power and design.
As shown in Figure 6, whole implementing circuit can obtain significantly high power factor, and the efficiency of whole circuit can to more than 85%, and power factor can reach more than 0.97.
As shown in Figure 7, when the initial conditions of the present embodiment is identical with the initial conditions of the existing application circuit of the existing market shown in Fig. 1, when the model of LED that first LED string 210 and the second LED string 211 seal in, quantity summation are identical with the LED string 105 in the existing application circuit of existing market shown in Fig. 1, the dimming scope of the present embodiment has exceeded a times of available circuit.
Embodiment 2:
As shown in Figure 8, the invention provides a kind of linear constant current circuit for controllable silicon light modulation, including controllable silicon dimmer 201, rectifier bridge 202, first linear constant current chip the 203, first current regulating resistance the 204, second linear constant current chip the 205, second current regulating resistance 206, third linear constant current chip the 207, the 3rd current regulating resistance 208, diode the 209, first LED string the 210, second LED string 211, maintain current regulating resistance 212 and maintain electric current control chip 213.
Controllable silicon dimmer 201 and AC-input voltage source electrical series；Two inputs of rectifier bridge 202 are electrically connected with controllable silicon dimmer 201 and AC-input voltage source respectively；The first linear OUT terminal of constant current chip 203 and the positive output end of rectifier bridge 202 are electrically connected；One end of first current regulating resistance 204 is electrically connected with the OUT terminal of the REXT end of the first linear constant current chip 203, maintenance electric current control chip 213 respectively；The other end of the first current regulating resistance 204 is electrically connected with the GND end of the first linear constant current chip 203, the OUT terminal of the second linear constant current chip 205 and the anode of the first LED string 210 respectively；The REXT end of the second linear constant current chip 205 is electrically connected with one end of the second current regulating resistance 206 and the negative electrode of diode 209 respectively；The GND end of the second linear constant current chip 205 is electrically connected with the anode of the other end of the second current regulating resistance 206, the second LED string 211 respectively；The negative terminal of the first LED string 210 is electrically connected with the OUT terminal of the anode of diode 209 and third linear constant current chip 207 respectively；The REXT end of third linear constant current chip 207 is electrically connected with the negative terminal of one end of the 3rd current regulating resistance 208, the second LED string 211 respectively；The GND end of third linear constant current chip 207 is electrically connected with one end of the other end of the 3rd current regulating resistance 208, the REXT end maintaining electric current control chip 213 and maintenance current regulating resistance 212 respectively；The GND end maintaining electric current control chip 213 is electrically connected with the output negative terminal of the other end and rectifier bridge 202 that maintain current regulating resistance 212 respectively.
The circuit adopted in embodiment 2 is all identical with work process with the operation principle of the circuit of employing in embodiment 1, makes two groups of LED strings can automatically switch in series system and parallel way according to the height of input voltage is adaptive.Do not repeat them here.Utilize in example 2 to maintain electric current control chip 213 and maintain current regulating resistance 212 combination and the maintenance electric current needed for controllable silicon light modulation is provided.So the dimming effect of controllable silicon dimmer 201 is strengthened to some extent.Bigger maintenance electric current so can be provided, simultaneously can the controllable silicon dimmer of compatible more different models and broader input power range.
First linear constant current chip the 203, second linear constant current chip 205, third linear constant current chip 207 and maintenance electric current control chip 213 are single channel linear current constant control chip in the present embodiment, and can adopt model is CL1570 or similar functions chip.This chip has three function feet, respectively: OUT foot, powers and current constant control port for chip power；GND foot, for chip ground end；REXT foot, arranges end for chip output current.
The linear constant current circuit of the LED string connection in series-parallel self adaptation switching of controllable silicon light modulation provided by the invention can reach to increase the purpose of dimming scope of controllable silicon light modulation, and will not increasing circuit loss, effectively reduce conversion efficiency.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the principles of the invention; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (8)
1. the linear constant current circuit for controllable silicon light modulation, it is characterised in that: controllable silicon dimmer, rectifier bridge, the first linear constant current chip, the first current regulating resistance, the second linear constant current chip, the second current regulating resistance, third linear constant current chip, the 3rd current regulating resistance, diode, the first LED string, the second LED string and maintenance current regulating module；Described controllable silicon dimmer and AC-input voltage source electrical series；Two inputs of rectifier bridge are electrically connected with controllable silicon dimmer and AC-input voltage source respectively；The first linear OUT terminal of constant current chip and the positive output end of rectifier bridge are electrically connected；The REXT end of one end of the first current regulating resistance and the first linear constant current chip is electrically connected；The other end of the first current regulating resistance is electrically connected with the GND end of the first linear constant current chip, the OUT terminal of the second linear constant current chip and the anode of the first LED string respectively；The REXT end of the second linear constant current chip is electrically connected with one end of the second current regulating resistance and the negative electrode of diode respectively；The GND end of the second linear constant current chip is electrically connected with the anode of the other end of the second current regulating resistance, the second LED string respectively；The negative terminal of the first LED string is electrically connected with the OUT terminal of the anode of diode and third linear constant current chip respectively；The REXT end of third linear constant current chip is electrically connected with the negative terminal of one end of the 3rd current regulating resistance, the second LED string respectively；The GND end of third linear constant current chip is electrically connected with the output negative terminal of the other end of the 3rd current regulating resistance, rectifier bridge respectively；Described maintenance current regulating module is for providing light modulation to maintain electric current to described controllable silicon dimmer.
2. the linear constant current circuit for controllable silicon light modulation according to claim 1, it is characterised in that: described maintenance current regulating module includes maintaining current regulating resistance, and the two ends of described maintenance current regulating resistance electrically connect with the negative electrode of diode and anode respectively.
3. the linear constant current circuit for controllable silicon light modulation according to claim 1, it is characterized in that: described maintenance current regulating module includes maintaining current regulating resistance and maintaining electric current control chip, the OUT terminal electricity of described maintenance electric current control chip electrically connects with the REXT end of the first linear constant current chip；The GND end maintaining electric current control chip is electrically connected with the output negative terminal of one end and rectifier bridge of maintaining current regulating resistance respectively；The REXT end maintaining electric current control chip is electrically connected with the GND end of the other end and third linear constant current chip that maintain current regulating resistance respectively.
4. the linear constant current circuit for controllable silicon light modulation according to claim 1, it is characterized in that: the resistance of described first current regulating resistance is less than the resistance of the 3rd current regulating resistance, and the resistance of the second current regulating resistance is more than the resistance of the 3rd current regulating resistance.
5. the linear constant current circuit for controllable silicon light modulation according to claim 1, it is characterised in that: the twice that resistance is the 3rd current regulating resistance resistance of described second current regulating resistance.
6. the linear constant current circuit for controllable silicon light modulation according to any one in claims 1 to 3, it is characterised in that: the model of the described first linear constant current chip, the second linear constant current chip and third linear constant current chip is CL1570.
7. the linear constant current circuit for controllable silicon light modulation according to claim 3, it is characterised in that: the model of described maintenance electric current control chip is CL1570.
8. the linear constant current circuit for controllable silicon light modulation, it is characterised in that: controllable silicon dimmer, rectifier bridge, the first linear constant current chip, the first current regulating resistance, the second linear constant current chip, the second current regulating resistance, third linear constant current chip, the 3rd current regulating resistance, diode, the first LED string, the second LED string and maintenance current regulating module；The electric current that AC-input voltage source provides enters bus after sequentially passing through controllable silicon dimmer and rectifier bridge, when busbar voltage higher than the pressure drop of 1 lamp string lower than the pressure drop of two lamp strings series connection time, first linear constant current chip leads directly to, first LED string and the second LED connection in series-parallel are lighted, bus current is diverted to the branch road at two lamp string places, and wherein in a branch road, electric current passes sequentially through bilinear constant current chip, the second current regulating resistance and the second LED string；In another branch road, electric current passes sequentially through the first LED string and third linear constant current chip, and the output electric current of two articles of branch roads returns to rectifier bridge each through after the 3rd current regulating resistance；When busbar voltage is higher than the pressure drop of two lamp string series connection, the second linear constant current chip and third linear constant current chip do not work, and the first LED string and the series connection of the second LED string are lighted；Bus current returns to rectifier bridge after passing sequentially through the first linear constant current chip, the first current regulating resistance, the first LED string, the second current regulating resistance, diode and the second LED string；Described maintenance current regulating module is for providing light modulation to maintain electric current to described controllable silicon dimmer.
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