CN210629925U - LED control circuit and device compatible with silicon controlled rectifier dimmer - Google Patents
LED control circuit and device compatible with silicon controlled rectifier dimmer Download PDFInfo
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- CN210629925U CN210629925U CN201921340743.8U CN201921340743U CN210629925U CN 210629925 U CN210629925 U CN 210629925U CN 201921340743 U CN201921340743 U CN 201921340743U CN 210629925 U CN210629925 U CN 210629925U
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Abstract
The utility model discloses a LED control circuit and a device compatible with a silicon controlled rectifier dimmer, wherein the LED control circuit comprises a silicon controlled rectifier dimmer, a rectification module, a discharge module, a control module, a voltage detection module and a constant current source module, and alternating current is input to output line voltage to the voltage detection module after passing through the silicon controlled rectifier dimmer and the rectification module; the voltage detection module outputs a voltage detection signal to the control module according to the change of the line voltage and outputs a phase angle detection signal to the constant current source module; the control module controls the opening or closing of the discharge module according to the voltage detection signal, and the discharge current of the discharge module when the discharge module is opened is larger than the maximum charging current of the silicon controlled rectifier dimmer before the silicon controlled rectifier dimmer is conducted; the constant current source module performs constant current driving on the LED lamp string when the line voltage is greater than the conduction voltage of the LED lamp string, and adjusts the constant current value according to the phase angle detection signal; the utility model discloses can improve the luminous light efficiency of LED lamp cluster, also can improve little looks corner lamp simultaneously and dodge the problem.
Description
Technical Field
The utility model relates to a LED technical field, in particular to compatible silicon controlled rectifier dimmer's LED control circuit, device.
Background
As shown in fig. 1, 2 and 3, in the conventional LED control circuit using silicon controlled rectifier for dimming, when the voltage flowing through the LED string is less than the lighting voltage of the LED string, the LED string is not lit, and the current flowing through the LED string is less than the current set in the bleeder circuit, so that the bleeder circuit is immediately turned on to enter a working state to form a current loop, but the current in the circuit is not used for lighting of the LED string, thereby causing the light efficiency of the LED string to become low; in addition, when the silicon controlled dimmer dims light to a small phase angle, the silicon controlled dimmer is turned on, but the MOS tube Q11 is in a linear region, the turn-on voltage of the silicon controlled dimmer has a linear relation with the turn-on current, the turn-on current is greatly influenced by the turn-on voltage, and the LED lamp string flickers when the turn-on voltages are inconsistent.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing prior art's weak point, an object of the utility model is to provide a LED control circuit, device of compatible silicon controlled rectifier light modulator can make when LED lamp cluster no longer lights, and the route of bleeding is not opened immediately, and then improves the luminous light efficiency of LED lamp cluster, also can improve the little looks corner lamp that exists when LED lamp cluster lights simultaneously and dodge the problem.
In order to achieve the purpose, the utility model adopts the following technical proposal:
an LED control circuit compatible with a silicon controlled rectifier dimmer is connected with an LED lamp string and comprises a silicon controlled rectifier dimmer, a rectifying module, a discharging module, a control module, a voltage detection module and a constant current source module; the alternating current is input to the voltage detection module after being subjected to phase cutting and rectification processing through the silicon controlled rectifier dimmer and the rectification module; the voltage detection module is used for outputting a voltage detection signal to the control module according to the change of the line voltage and outputting a phase angle detection signal to the constant current source module; the control module is used for controlling the opening or closing of the bleeder module according to the voltage detection signal, and the bleeder current when the bleeder module is opened is larger than the maximum charging current before the silicon controlled rectifier dimmer is conducted; the constant current source module is used for performing constant current driving on the LED lamp string when the line voltage is larger than the conduction voltage of the LED lamp string, and adjusting a constant current value according to the phase angle detection signal.
In the LED control circuit compatible with the silicon controlled rectifier dimmer, the control module is specifically configured to control the bleeding module to be turned on when the voltage detection signal is smaller than a second threshold voltage, control the bleeding module to be turned off when the voltage detection signal is larger than the second threshold voltage, and control the bleeding module to be turned on when the voltage detection signal is smaller than the first threshold voltage again; wherein the first threshold voltage is less than or equal to the second threshold voltage.
In the LED control circuit compatible with the silicon controlled rectifier dimmer, the voltage detection module comprises a voltage detection unit and a phase angle detection unit, and the voltage detection unit is used for outputting a voltage detection signal to the control module according to the change of the line voltage; the phase angle detection unit is used for outputting the phase angle detection signal to the constant current source module according to the change of the line voltage.
In the LED control circuit compatible with the silicon controlled rectifier dimmer, the voltage detection unit comprises a first resistor and a second resistor, one end of the first resistor is connected with the rectifying module and the LED lamp string, the other end of the first resistor is connected with one end of the second resistor and the control module, and the other end of the second resistor is grounded.
The LED control circuit of compatible silicon controlled rectifier dimmer in, phase angle detecting element includes third resistance, fourth resistance and first electric capacity, the one end of third resistance is connected the one end of first resistance the LED lamp cluster with the rectifier module, the other end of third resistance is connected the one end of fourth resistance the one end of first electric capacity with the constant current source module, the other end of fourth resistance with the other end of first electric capacity all grounds.
In the LED control circuit compatible with the silicon controlled rectifier dimmer, the control module comprises a first operational amplifier and a first MOS (metal oxide semiconductor) tube, the positive phase input end of the first operational amplifier is connected with the other end of the first resistor and one end of the second resistor, the negative phase input end of the first operational amplifier is connected with the power supply end, the output end of the first operational amplifier is connected with the grid electrode of the first MOS tube, the drain electrode of the first MOS tube is connected with the drain module, and the source electrode of the first MOS tube is grounded.
In the LED control circuit compatible with the silicon controlled rectifier dimmer, the discharge module comprises a second operational amplifier, a second MOS tube and a fifth resistor, the positive phase input end of the second operational amplifier is connected with a power supply, the negative phase input end of the second operational amplifier is connected with the source electrode of the second MOS tube and one end of the fifth resistor, the output end of the second operational amplifier is connected with the grid electrode of the second MOS tube and the drain electrode of the first MOS tube, and the other end of the fifth resistor is grounded.
The LED control circuit of compatible silicon controlled rectifier dimmer in, constant current source module includes third operational amplifier, second MOS pipe and sixth resistance, the normal phase input end of third operational amplifier is connected the other end of third resistance, the one end of fourth resistance with the one end of first electric capacity, the inverting input end of third operational amplifier is connected the source electrode of third MOS pipe with the one end of sixth resistance, the output of third operational amplifier is connected the grid of third MOS pipe, the drain electrode of third MOS pipe is connected the LED lamp cluster, the other end ground connection of sixth resistance.
The LED control device compatible with the silicon controlled rectifier dimmer comprises a shell, wherein a PCB is arranged in the shell, and an LED control circuit compatible with the silicon controlled rectifier dimmer is arranged on the PCB.
Compared with the prior art, the utility model provides a compatible silicon controlled rectifier's LED control circuit, device, LED control circuit includes silicon controlled rectifier dimmer, rectification module, bleeder module, control module, voltage detection module and constant current source module, and the output line voltage reaches voltage detection module after the input alternating current carries out phase place cutting and rectification processing through silicon controlled rectifier dimmer and rectification module; the voltage detection module is used for outputting a voltage detection signal to the control module according to the change of the line voltage and outputting a phase angle detection signal to the constant current source module; the control module is used for controlling the opening or closing of the bleeder module according to the voltage detection signal, and the bleeder current when the bleeder module is opened is larger than the maximum charging current before the silicon controlled rectifier dimmer is conducted; the constant current source module is used for the line voltage is greater than right during the conducting voltage of LED lamp cluster carries out constant current drive, and according to phase angle detected signal adjusts the constant current value, the utility model discloses when can making LED lamp cluster no longer light, the route of bleeding is not opened immediately, and then improves the luminous light efficiency of LED lamp cluster, also can improve the little phase angle lamp that exists when LED lamp cluster lights simultaneously and dodge the problem.
Drawings
FIG. 1 is a circuit schematic of a prior art LED control circuit;
FIG. 2 is a waveform diagram of line voltage when a thyristor dimmer in a prior art LED control circuit dims to a large phase angle;
FIG. 3 is a waveform diagram of line voltage when a thyristor dimmer in a prior art LED control circuit dims to a small phase angle;
fig. 4 is a circuit block diagram of an LED control circuit of the compatible silicon controlled dimmer provided by the present invention;
fig. 5 is a waveform diagram of the line voltage when the thyristor dimmer in the LED control circuit of the compatible thyristor dimmer adjusts the light to a large phase angle;
fig. 6 is a waveform diagram of the line voltage when the thyristor dimmer in the LED control circuit of the compatible thyristor dimmer adjusts the light to a small phase angle;
FIG. 7 is an equivalent diagram of a thyristor dimmer in the LED control circuit compatible with the thyristor dimmer provided by the present invention;
fig. 8 is an equivalent diagram of the thyristor dimmer in the LED control circuit compatible with the thyristor dimmer provided in the present invention before being turned on;
fig. 9 is a schematic circuit diagram of a first preferred embodiment of an LED control circuit of a compatible scr dimmer provided by the present invention;
fig. 10 is a schematic circuit diagram of a second preferred embodiment of an LED control circuit of a compatible scr dimmer according to the present invention;
fig. 11 is a schematic circuit diagram of a third preferred embodiment of an LED control circuit of a compatible scr dimmer provided by the present invention;
fig. 12 is a schematic circuit diagram of a fourth preferred embodiment of an LED control circuit of a compatible scr dimmer provided by the present invention.
Detailed Description
An object of the utility model is to provide a LED control circuit, device of compatible silicon controlled rectifier dimmer can make when the LED lamp cluster no longer lights, and the route of bleeding is not opened immediately, and then improves the luminous light efficiency of LED lamp cluster, also can improve the little looks angle lamp that exists when the LED lamp cluster lights simultaneously and dodge the problem.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the following description of the present invention will refer to the accompanying drawings and illustrate embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Please refer to fig. 4, fig. 5 and fig. 6, the utility model provides a compatible silicon controlled rectifier dimmer 100's LED control circuit, it is connected with LED lamp cluster 10, including silicon controlled rectifier dimmer 100, rectifier module 200, bleeder module 300, control module 400, voltage detection module 500 and constant current source module 600, wherein silicon controlled rectifier dimmer 100 connects between ac input end and rectifier module 200 input for carry out the phase place cutting to the input alternating current, rectifier module 200's output is connected bleeder module 300, voltage detection module 500 and LED lamp cluster 10, bleeder module 300 still connects voltage detection module 500 through control module 400, voltage detection module 500 still connects constant current source module 600, constant current source module 600 still connects LED lamp cluster 10.
In the present invention, the rectifying module 200 rectifies and converts the phase-cut ac power into dc power, and outputs the dc power to the voltage detecting module 500 and the LED string 10 via the dc bus, the voltage sensing module 500 outputs a voltage sensing signal V1 to the control module 400 according to the change of the line voltage, the control module 400 controls the opening or closing of the bleeding module 300 according to the voltage detection signal V1, and the bleeding current of the bleeding module 300 when it is turned on is larger than the maximum charging current of the triac dimmer 100 before it is turned on, that is, the control module 400 controls the corresponding working state of the bleeder module 300 according to the voltage detection signal V1 after meeting the preset condition, so as to achieve the effect of improving the light emitting efficiency of the LED light string 10, when the line voltage is less than the on-state voltage of the LED light string 10, the bleeder module 300 bleeds the dc bus current to maintain the operation of the thyristor; the voltage detection module 500 detects phase angle information of the silicon controlled dimmer 100 and outputs a corresponding phase angle detection signal V2 to the constant current source module 600, so that the constant current source module 600 can adjust the constant current value according to the phase angle detection signal V2 in the process of constant current driving of the LED lamp string 10 when the line voltage is greater than the conduction voltage of the LED lamp string 10, thereby reducing the influence of the turn-on voltage of the silicon controlled dimmer 100 and further improving the problem of small-phase angle lamp flashing.
Further, the control module 400 is specifically configured to control the bleeding module 300 to turn on when the voltage detection signal V1 is less than a second threshold voltage VREF2, control the bleeding module 300 to turn off when the voltage detection signal V1 is greater than a second threshold voltage VREF2, and control the bleeding module 300 to turn on continuously when the voltage detection signal V1 is less than a first threshold voltage VREF1 again, and control the bleeding current when the bleeding module 300 turns on to be greater than the maximum charging current before the thyristor dimmer 100 is turned on, specifically, please refer to fig. 7 and 8 together, where fig. 7 is an equivalent diagram of the thyristor dimmer 100, when the dimmer 100 is not turned on, the thyristor does not conduct current through, that is, the equivalent diagram before the dimmer 100 conducts is shown in fig. 8, the input ac current charges the capacitor Cx through the resistor RL and the resistor RB before the dimmer 100 conducts, where the conducting condition of the dimmer 100 is that the voltage of the capacitor Cx reaches the turn-on threshold, that the voltage difference between the two ends of the capacitor Cx reaches a certain voltage threshold, that the voltage difference between the two ends of the capacitor Cx reaches a threshold voltage RB, that is equal to the charging current before the dimmer 100 ci + RB, the charging current of the thyristor 100 is equal to the charging current of the thyristor, where the charging current of the thyristor 100 is equal to the charging current ci + the charging resistor rv 60, and the charging current of the charging resistor rv 60, where the charging resistor rv 1 is equal to the charging current before the charging current of the dimmer 100, where the charging resistor rv 20 is equal to the maximum charging current ci + 1, and the charging current of the maximum charging current of the dimmer 100, where the charging resistor rv 1 is equal to the maximum charging resistor rv 1, where the charging current before the charging current of the charging resistor RB before the charging resistor rv 1 is equal to the dimmer 100, the charging current of the maximum charging resistor RB, where the charging resistor rv 1, the charging resistor RB, the maximum charging resistor RB before the maximum charging resistor rv 1 is equal to the maximum charging resistor RB before the charging resistor rv.
Wherein the first threshold voltage VREF1 is less than or equal to the second threshold voltage VREF 2; when the line voltage rises, when the line voltage is less than the second threshold voltage VREF2, that is, the voltage detection signal V1 is less than the second threshold voltage VREF2, the thyristor dimmer 100 is turned on, the control module 400 outputs a corresponding control signal to the bleeding module 300, the bleeding module 300 is turned on to perform current bleeding, when the line voltage continuously rises to be greater than the second threshold voltage VREF2, that is, the voltage detection signal V1 is greater than the second threshold voltage VREF2, the control module 400 controls the bleeding module 300 to be turned off, and then when the line voltage falls back to be lower than the conduction voltage of the LED string 10, the LED string 10 is not lit, the control module 400 does not immediately turn on the bleeding module 300, but controls the bleeding module 300 to be turned on to bleed again when the line voltage is less than the first threshold voltage VREF1, compared with the existing circuit, a part of current is reduced, and the luminous efficiency of the LED light string 10 is further improved, wherein the first threshold voltage VREF1 is less than or equal to the second threshold voltage VREF 2.
Further, referring to fig. 9, the voltage detection module 500 includes a voltage detection unit 510 and a phase angle detection unit 520, the voltage detection unit 510 is connected to the control module 400, the rectifier module 200 and the phase angle detection unit 520, and the phase angle detection unit 520 is further connected to the constant current source module 600; the voltage detection unit 510 is configured to output a voltage detection signal V1 to the control module 400 according to the change of the line voltage; the phase angle detection unit 520 is configured to output the phase angle detection signal V2 to the constant current source module 600 according to the change of the line voltage, and output a voltage detection signal V1 to the control module 400 through the detection of the change of the line voltage by the voltage detection unit 510, so that the control module 400 controls the working state of the discharge module 300, and further improves the light emitting efficiency of the LED light string 10; meanwhile, when the LED light string 10 emits light, the phase angle detection unit 520 detects the phase angle of the scr dimmer 100, so that the constant current source module 600 can adjust the constant current value of the LED light string 10, thereby improving the problem of small-phase angle light flashing.
In specific implementation, the voltage detection unit 510 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the rectifier module 200 and the LED light string 10, the other end of the first resistor R1 is connected to one end of the second resistor R2 and the control module 400, the other end of the second resistor R2 is grounded, the first resistor R1 and the second resistor R2 are voltage dividing resistors, the line voltage is sampled through the first resistor R1 and the second resistor R2 to obtain a voltage detection signal V1, and then the voltage detection signal V1 is output to the control module 400, so that the control module 400 flexibly controls the on and off of the bleeding module 300 according to the voltage detection signal V1.
Further, referring to fig. 9, in the first preferred embodiment of the present invention, the phase angle detecting unit 520 includes a third resistor R3, a fourth resistor R4 and a first capacitor C1, one end of the third resistor R3 is connected to one end of the first resistor R1, the LED string 10 and the rectifying module 200, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, one end of the first capacitor C1 and the constant current source module 600, the other end of the fourth resistor R4 and the other end of the first capacitor C1 are grounded, the third resistor R3 and the fourth resistor R4 are phase angle dividing resistors, the first capacitor C1 is a filter capacitor for filtering the detection signal V2 and outputting the filtered detection signal to the constant current source module 600, the phase cutting process of the scr dimmer 100 is to change the effective value of the line voltage, the voltage of the line is divided and sampled through the third resistor R3 and the fourth resistor R4 to obtain a sampling voltage to represent a conduction phase angle of the silicon controlled dimmer 100, namely, a phase angle detection signal V2 is obtained through detection, and a constant current value is adjusted through detecting an effective value of the line voltage, namely, a phase angle detection signal V2, so that the problem of small-phase-angle lamp flashing can be effectively solved.
In this embodiment, the control module 400 includes a first operational amplifier U1 and a first MOS transistor Q1, a positive phase input terminal of the first operational amplifier U1 is connected to the other end of the first resistor R1 and one end of the second resistor R2, an inverting input terminal of the first operational amplifier U1 is connected to a power supply terminal, an output terminal of the first operational amplifier U1 is connected to a gate of the first MOS transistor Q1, a drain of the first MOS transistor Q1 is connected to the bleeder module 300, a source of the first MOS transistor Q1 is grounded, a positive phase input terminal of the first operational amplifier U1 inputs the voltage detection signal V1, and an inverting input terminal of the first operational amplifier U1 outputs the second threshold voltage VREF2 or the second threshold voltage VREF 2; when the line voltage rises, the first operational amplifier U1 compares the voltage detection signal V1 with the second threshold voltage VREF2, and when the voltage detection signal V1 is smaller than the second threshold voltage VREF2, the first MOS transistor Q1 is controlled to be turned on through the output terminal, so as to form a pull-down current to the ground, and at the same time, the draining module 300 is turned on to drain, and the draining current at this time is greater than the maximum charging current value before the thyristor dimmer 100 is turned on, where the pull-down current value is greater than the maximum current value for charging the capacitor in the thyristor dimmer 100 before the thyristor dimmer 100 is turned on, so that the line voltage change can be determined by the charging current of the thyristor dimmer 100 before being turned on, thereby ensuring that the maximum phase angle is determined by the thyristor dimmer 100 itself.
Then, when the first operational amplifier U1 compares that the voltage detection signal V1 is greater than the second threshold voltage VREF2, the first MOS transistor Q1 is controlled to be turned off, so as to control the bleeding module 300 to be turned off; setting the comparison voltage of the first operational amplifier U1 to be a first threshold voltage VREF1, that is, when the first operational amplifier U1 compares that the voltage detection signal V1 is less than the first threshold voltage VREF1 again, controlling the bleeding module 300 to be in a turned-on state for bleeding, and bleeding with the current fixed current without turning off the bleeding module 300, so that the capacitor in the triac dimmer 100 is completely discharged, and lamp flash caused by inconsistent turn-on voltage of the triac dimmer 100 due to incomplete discharge of the capacitor in the triac dimmer 100 is avoided; meanwhile, the bleeder module 300 can be controlled to be turned on or off under certain conditions by setting the first threshold voltage VREF1 and the second threshold voltage VREF2, that is, after the lamp of the bleeder module 300 is not turned on, the bleeder module is turned on again after the line voltage is lower than the first threshold voltage VREF1, and the turning-off process is not performed, so that the light emitting efficiency of the LED light string 10 is improved.
Further, in the present embodiment, the bleeder module 300 includes a second operational amplifier U2, a second MOS transistor Q2 and a fifth resistor R5, the non-inverting input terminal of the second operational amplifier U2 is connected to a power supply, the inverting input terminal of the second operational amplifier U2 is connected to the source of the second MOS transistor Q2 and one end of the fifth resistor R5, the output end of the second operational amplifier U2 is connected with the grid electrode of the second MOS tube Q2 and the drain electrode of the first MOS tube Q1, the other end of the fifth resistor R5 is grounded, the bleeder module 300 is a constant current source with the same structure as the constant current source module 600, after the bleeder module 300 is turned on, the output current may be adjusted by adjusting the voltage VREF3 input to the positive phase input terminal of the second operational amplifier U2, that is, the bleeder current of the bleeder module 300 may be adjusted, so as to ensure that the bleeder current when the bleeder module 300 is turned on is greater than the maximum charging current before the thyristor dimmer 100 is turned on.
Further, the constant current source module 600 includes a third operational amplifier U3, a third MOS transistor Q3 and a sixth resistor R6, a positive phase input terminal of the third operational amplifier U3 is connected to the other terminal of the third resistor R3, one terminal of the fourth resistor R4 and one terminal of the first capacitor C1, an inverted phase input terminal of the third operational amplifier U3 is connected to the source of the third MOS transistor Q3 and one terminal of the sixth resistor R6, an output terminal of the third operational amplifier U3 is connected to the gate of the third MOS transistor Q3, a drain of the third MOS transistor Q3 is connected to the LED string 10, the other terminal of the sixth resistor R6 is grounded, the phase angle detection signal V2 is input to the positive phase input terminal of the third operational amplifier U3, and the output value of the operational amplifier U3 is directly adjusted by detecting an effective value of the line voltage, so as to adjust the constant current value, the influence of the turn-on voltage of the thyristor dimmer 100 is reduced, and the problem of small phase angle lamp flash is improved.
In a second preferred embodiment of the present invention, referring to fig. 10, the control module 400 includes a fourth operational amplifier U4 and a fourth MOS transistor Q4, the bleeder module 300 includes a fifth operational amplifier U5, a fifth MOS transistor Q5 and a seventh resistor R7, a non-inverting input terminal of the fourth operational amplifier U4 is connected to the other end of the first resistor R1 and one end of the second resistor R2, an inverting input terminal of the fourth operational amplifier U4 is connected to a power supply terminal, an output terminal of the fourth operational amplifier U4 is connected to a control terminal of the fourth MOS transistor Q4, a source of the fourth MOS transistor Q4 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is grounded, a drain of the fourth MOS transistor Q4 is connected to an inverting input terminal of the fifth operational amplifier U5 and a source of the fifth MOS transistor Q5, an output terminal of the fifth operational amplifier U5 is connected to a gate of the fifth MOS transistor Q5, the drain of the fifth MOS transistor Q5 is connected to the rectifying module 200, and when the fourth operational amplifier U4 compares that the voltage detection signal V1 is smaller than the second threshold voltage VREF2, the fourth MOS transistor Q4 is controlled to be turned on, so that the bleeding module 300 is controlled to be turned on to perform current bleeding; when the fourth operational amplifier U4 compares that the voltage detection signal V1 is greater than a second threshold voltage VREF2, the fourth MOS transistor Q4 is controlled to turn off to further control the bleeder module 300 to turn off, then the comparison voltage of the fourth operational amplifier U4 is a first threshold voltage VREF1, and when the voltage detection signal V1 falls back to be less than the first threshold voltage VREF1, the bleeder module 300 is kept in an on state, and a fixed current value is used for bleeding and is not turned off again, so as to improve the light emitting efficiency of the LED light string 10; after the bleeder module 300 is turned on, the constant current source having the same structure as the constant current source module 600 may adjust the output current by setting the voltage value VREF3 at the positive phase input end of the sixth operational amplifier U6, that is, the bleeder current of the bleeder module 300 is realized.
Preferably, in a third preferred embodiment of the present invention, referring to fig. 11, the LED control circuit of the compatible scr dimmer 100 further includes a second capacitor C2 and a first diode D1, one end of the second capacitor C2 is connected to the cathode of the first diode D1 and the input end of the LED light string 10, the other end of the second capacitor C2 is connected to the output end of the LED light string 10, the anode of the first diode D1 is connected to the rectifying module 200, and the LED light string 10 is connected to the capacitors in parallel and the input end of the LED light string 10 is connected to a diode, so that the LED light string 10 is ensured not to have a flash frequency phenomenon.
Preferably, in a fourth preferred embodiment of the present invention, referring to fig. 12, the phase angle detecting unit 520 includes an eighth resistor R8, a ninth resistor R9 and a third capacitor C3, one end of the eighth resistor R8 is connected to one end of the first resistor R1, the LED string 10 and the rectifying module 200, the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9, one end of the third capacitor C3 and the non-inverting input terminal of the third operational amplifier U3, the other end of the ninth resistor R9 and the other end of the third capacitor C3 are both grounded, the phase angle detection unit 520 detects the effective value of the line voltage, i.e., the phase angle detection signal V2, to the non-inverting input terminal of the third operational amplifier U3, the constant current value of the constant current source module 600 is further adjusted, the influence of the starting voltage of the silicon controlled rectifier dimmer 100 is reduced, and the problem of small-phase angle lamp flashing is solved.
Correspondingly, the utility model discloses compatible silicon controlled rectifier's LED control circuit's theory of operation specifically does
The input alternating current is subjected to phase cutting and rectification processing through the silicon controlled rectifier dimmer and the rectification module, and then output line voltage to the voltage detection module; the voltage detection module outputs a voltage detection signal to the control module according to the change of the line voltage and outputs a phase angle detection signal to the constant current source module; the control module controls the opening or closing of the bleeder module according to the voltage detection signal, and the bleeder current when the bleeder module is opened is larger than the maximum charging current before the silicon controlled rectifier dimmer is conducted; and when the line voltage is greater than the conduction voltage of the LED lamp string, the constant current source module performs constant current driving on the LED lamp string and adjusts the constant current value according to the phase angle detection signal.
The utility model discloses still correspondingly provide a LED controlling means of compatible silicon controlled rectifier dimmer, which comprises an outer shell, be provided with the PCB board in the shell, be provided with on the PCB board as above compatible silicon controlled rectifier dimmer's LED control circuit, because the above has been right compatible silicon controlled rectifier dimmer's LED control circuit has carried out detailed introduction, and here is no longer detailed.
To sum up, the utility model provides a compatible silicon controlled rectifier's LED control circuit, device, the LED control circuit includes silicon controlled rectifier dimmer, rectification module, bleeder module, control module, voltage detection module and constant current source module, inputs alternating current and carries out phase place cutting and rectification processing through silicon controlled rectifier dimmer and rectification module, output line voltage to voltage detection module; the voltage detection module is used for outputting a voltage detection signal to the control module according to the change of the line voltage and outputting a phase angle detection signal to the constant current source module; the control module is used for controlling the opening or closing of the bleeder module according to the voltage detection signal, and the bleeder current when the bleeder module is opened is larger than the maximum charging current before the silicon controlled rectifier dimmer is conducted; the constant current source module is used for the line voltage is greater than right during the conducting voltage of LED lamp cluster carries out constant current drive, and according to phase angle detected signal adjusts the constant current value, the utility model discloses when can making LED lamp cluster no longer light, the route of bleeding is not opened immediately, and then improves the luminous light efficiency of LED lamp cluster, also can improve the little phase angle lamp that exists when LED lamp cluster lights simultaneously and dodge the problem.
It should be understood that equivalent alterations and modifications can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such alterations and modifications should fall within the scope of the appended claims.
Claims (9)
1. An LED control circuit compatible with a silicon controlled dimmer is connected with an LED lamp string and comprises the silicon controlled dimmer and a rectification module, and is characterized by also comprising a discharge module, a control module, a voltage detection module and a constant current source module; the alternating current is input to the voltage detection module after being subjected to phase cutting and rectification processing through the silicon controlled rectifier dimmer and the rectification module; the voltage detection module is used for outputting a voltage detection signal to the control module according to the change of the line voltage and outputting a phase angle detection signal to the constant current source module; the control module is used for controlling the opening or closing of the bleeder module according to the voltage detection signal, and the bleeder current when the bleeder module is opened is larger than the maximum charging current before the silicon controlled rectifier dimmer is conducted; the constant current source module is used for performing constant current driving on the LED lamp string when the line voltage is larger than the conduction voltage of the LED lamp string, and adjusting a constant current value according to the phase angle detection signal.
2. The triac dimmer-compatible LED control circuit of claim 1, wherein the control module is specifically configured to control the bleeding module to turn on when the voltage detection signal is less than a second threshold voltage, to turn off when the voltage detection signal is greater than the second threshold voltage, and to turn on when the voltage detection signal is again less than the first threshold voltage; wherein the first threshold voltage is less than or equal to the second threshold voltage.
3. The triac dimmer compatible LED control circuit of claim 1, wherein said voltage detection module comprises a voltage detection unit and a phase angle detection unit, said voltage detection unit being configured to output a voltage detection signal to said control module based on a change in said line voltage; the phase angle detection unit is used for outputting the phase angle detection signal to the constant current source module according to the change of the line voltage.
4. The LED control circuit of claim 3, wherein the voltage detection unit comprises a first resistor and a second resistor, one end of the first resistor is connected to the rectifying module and the LED light string, the other end of the first resistor is connected to one end of the second resistor and the control module, and the other end of the second resistor is grounded.
5. The LED control circuit of claim 4, wherein the phase angle detection unit comprises a third resistor, a fourth resistor and a first capacitor, one end of the third resistor is connected to one end of the first resistor, the LED light string and the rectification module, the other end of the third resistor is connected to one end of the fourth resistor, one end of the first capacitor and the constant current source module, and the other end of the fourth resistor and the other end of the first capacitor are both grounded.
6. The LED control circuit compatible with the silicon controlled dimmer as claimed in claim 4, wherein the control module comprises a first operational amplifier and a first MOS transistor, a non-inverting input terminal of the first operational amplifier is connected to the other end of the first resistor and one end of the second resistor, an inverting input terminal of the first operational amplifier is connected to a power supply terminal, an output terminal of the first operational amplifier is connected to a gate of the first MOS transistor, a drain of the first MOS transistor is connected to the bleeding module, and a source of the first MOS transistor is grounded.
7. The LED control circuit compatible with the silicon controlled dimmer as claimed in claim 6, wherein the bleeding module comprises a second operational amplifier, a second MOS transistor and a fifth resistor, wherein a non-inverting input terminal of the second operational amplifier is connected to a power supply terminal, an inverting input terminal of the second operational amplifier is connected to a source of the second MOS transistor and one end of the fifth resistor, an output terminal of the second operational amplifier is connected to a gate of the second MOS transistor and a drain of the first MOS transistor, and the other end of the fifth resistor is grounded.
8. The LED control circuit compatible with the silicon controlled dimmer as claimed in claim 5, wherein the constant current source module comprises a third operational amplifier, a third MOS transistor and a sixth resistor, wherein a non-inverting input terminal of the third operational amplifier is connected to the other terminal of the third resistor, one terminal of the fourth resistor and one terminal of the first capacitor, an inverting input terminal of the third operational amplifier is connected to a source of the third MOS transistor and one terminal of the sixth resistor, an output terminal of the third operational amplifier is connected to a gate of the third MOS transistor, a drain of the third MOS transistor is connected to the LED light string, and the other terminal of the sixth resistor is grounded.
9. An LED control device compatible with a silicon controlled rectifier dimmer, comprising a shell, wherein a PCB is arranged in the shell, and the PCB is provided with an LED control circuit compatible with the silicon controlled rectifier dimmer according to any one of claims 1 to 8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110505733A (en) * | 2019-08-14 | 2019-11-26 | 深圳市晟碟半导体有限公司 | LED control circuit, device and the control method of compatible silicon controlled light modulator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110505733A (en) * | 2019-08-14 | 2019-11-26 | 深圳市晟碟半导体有限公司 | LED control circuit, device and the control method of compatible silicon controlled light modulator |
| CN110505733B (en) * | 2019-08-14 | 2024-07-23 | 深圳市晟碟半导体有限公司 | LED control circuit, device and control method compatible with silicon controlled rectifier dimmer |
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