CN110225617B - Dimming driving power circuit - Google Patents
Dimming driving power circuit Download PDFInfo
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- CN110225617B CN110225617B CN201910493484.0A CN201910493484A CN110225617B CN 110225617 B CN110225617 B CN 110225617B CN 201910493484 A CN201910493484 A CN 201910493484A CN 110225617 B CN110225617 B CN 110225617B
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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Abstract
The embodiment of the invention discloses a dimming driving power circuit, which comprises an MLV dimming control module, an MLV transformer, a first rectifying and filtering module, a second rectifying and filtering module, a first voltage conversion module, a second voltage conversion module and a knob dimming control module, wherein the MLV transformer is connected with the MLV dimming control module; the input end of the first rectifying and filtering module and the input end of the second rectifying and filtering module are both electrically connected with the MLV transformer, the output end of the first rectifying and filtering module is electrically connected with the input end of the first voltage conversion module, and the input end of the second voltage conversion module is electrically connected with the output end of the first voltage conversion module; the output end of the second rectifying and filtering module is electrically connected with the first input end of the knob dimming control module; the second input end of the knob dimming control module is electrically connected with the output end of the first voltage conversion module, and the output end of the knob dimming control module is electrically connected with the control end of the second voltage conversion module. The MLV dimming and knob dimming are compatible, and a user can conveniently select a product to meet the requirement of various light brightness.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supplies, in particular to a dimming driving power supply circuit.
Background
At present, LED lighting products are widely popularized, especially, the LED lighting replaces the use of traditional lighting products, along with the improvement of living standard of people, the LED landscape lighting is widely popularized, and human beings are in severe energy consumption and heavy environmental pressure, so that the reduction of lighting energy consumption is the key point of constant attention of society.
Generally, an electromagnetic Low Voltage (MLV) transformer is used for LED landscape lighting, and converts commercial power into Low Voltage power to drive an AC-DC Low Voltage driving power supply to drive an LED to implement lighting.
However, in the market, low-voltage driving products connected with most landscape lighting MLV transformers cannot realize dimming, so that customers cannot select brightness according to needs, and energy consumption cannot be saved according to needs.
Disclosure of Invention
The embodiment of the invention provides a dimming driving power circuit which is used for MLV dimming, meets the application requirements of different luminance brightness, is compatible with knob dimming, greatly facilitates users to select a product to meet the requirements of various luminance brightness, and has the characteristics of strong dimming compatibility, wide dimming range, good dimming effect and the like.
In a first aspect, an embodiment of the present invention provides a dimming driving power circuit, including an MLV dimming control module, an MLV transformer, a first rectifying and filtering module, a second rectifying and filtering module, a first voltage conversion module, a second voltage conversion module, and a knob dimming control module;
the input end of the MLV dimming control module is used for inputting alternating current, and the output end of the MLV dimming control module is electrically connected with the input end of the MLV transformer;
the input end of the first rectifying and filtering module is electrically connected with the output end of the MLV transformer, the output end of the first rectifying and filtering module is electrically connected with the input end of the first voltage conversion module, and the first voltage conversion module is used for converting the voltage at the input end and then outputting the converted voltage from the output end;
the input end of the second voltage conversion module is electrically connected with the output end of the first voltage conversion module, the output end of the second voltage conversion module is used for connecting a light-emitting device, and the second voltage conversion module is used for adjusting the size of an output signal of the output end according to a signal of the control end so as to drive the electrically connected light-emitting device to adjust light;
the first input end of the second rectifying and filtering module is electrically connected with the output end of the MLV transformer, and the output end of the second rectifying and filtering module is electrically connected with the first input end of the knob dimming control module;
the second input end of the knob dimming control module is electrically connected with the output end of the first voltage conversion module, the output end of the knob dimming control module is electrically connected with the control end of the second voltage conversion module, and a signal output by the output end of the knob dimming control module is adjustable.
Optionally, the first rectifying and filtering module includes: the MLV transformer comprises a full-wave rectifier bridge stack and a first capacitor, wherein the input end of the full-wave rectifier bridge stack is electrically connected with the output end of the MLV transformer, the output end of the full-wave rectifier bridge stack is electrically connected with the input end of the first voltage conversion module, and the first capacitor is connected in parallel with the output end of the rectifier bridge stack.
Optionally, the second rectifying and filtering module includes: a first diode and a second diode;
the anode of the first diode and the anode of the second diode are respectively and electrically connected with the first port and the second port of the output end of the MLV transformer, and the cathode of the first diode and the cathode of the second diode are both electrically connected with the first input end of the knob dimming control module.
Optionally, the knob dimming control module includes a first voltage division circuit, a first resistor, a first adjustable potentiometer and a triode;
the first end of the first adjustable potentiometer is electrically connected with the cathode of the first diode and the cathode of the second diode, and the second end of the first adjustable potentiometer is grounded through the first resistor;
the control electrode of the triode is electrically connected with the output end of the first adjustable potentiometer, the first electrode of the triode is electrically connected with the output end of the first voltage conversion module, the second electrode of the triode is electrically connected with the first end of the voltage division circuit, the second end of the first voltage division circuit is grounded, and the output end of the first voltage division circuit is electrically connected with the control end of the second voltage conversion module.
Optionally, the second rectifying and filtering module further includes a second resistor, a second capacitor, and a zener diode; the cathode of the first diode and the cathode of the second diode are both electrically connected with the first end of the first adjustable potentiometer through the second resistor; the first end of the second capacitor is electrically connected with the first end of the first adjustable potentiometer, and the second end of the second capacitor is grounded;
the voltage stabilizing diode is connected with the second capacitor in parallel;
the first voltage division circuit comprises a third resistor and a fourth resistor, wherein a first end of the third resistor is used as a first end of the first voltage division circuit, a second end of the third resistor is electrically connected with a first end of the fourth resistor and is used as an output end of the first voltage division circuit, and a second end of the fourth resistor is used as a second end of the first voltage division circuit.
Optionally, the first voltage conversion module includes: the first DC-DC chip, the first switching tube, the fifth resistor, the sixth resistor, the first inductor, the third capacitor, the third diode and the second voltage division circuit; wherein the first DC-DC chip comprises a voltage input terminal, a current sampling input terminal, a switching signal output terminal and a feedback voltage input terminal;
a voltage input end of the first DC-DC chip is electrically connected to an output end of the first rectifying and filtering module, a first end of the fifth resistor is electrically connected to the voltage input end, a second end of the fifth resistor is electrically connected to the current sampling input end and a first end of the first inductor, a second end of the first inductor is electrically connected to an anode of the third diode, and a cathode of the third diode is electrically connected to an output end of the first voltage converting module;
the control end of the first switch tube is electrically connected with the switch signal output end through the sixth resistor, the first end of the first switch tube is electrically connected with the second end of the second inductor, and the second end of the first switch tube is grounded;
a first end of the second voltage division circuit is electrically connected with a second end of the first inductor, a second end of the second voltage division circuit is grounded, and an output end of the second voltage division circuit is electrically connected with the feedback voltage input end;
the first end of the third capacitor is electrically connected with the cathode of the third diode, and the second end of the third capacitor is grounded.
Optionally, the second voltage dividing circuit includes a seventh resistor and an eighth resistor;
a first end of the seventh resistor is used as a first end of the second voltage-dividing circuit, a second end of the seventh resistor is electrically connected with a first end of the eighth resistor to be used as an output end of the second voltage-dividing circuit, and a second end of the eighth resistor is used as a second end of the second voltage-dividing circuit.
Optionally, the second voltage conversion module includes: the second DC-DC chip, a ninth resistor, a tenth resistor, a second adjustable potentiometer, a fourth diode, a fourth capacitor and a second inductor; the second DC-DC chip comprises a voltage input end, a driving output end, a first switch control output end, a second switch control output end and a control end;
the voltage input end of the second DC-DC chip and the cathode of the fourth diode are electrically connected with the output end of the first voltage conversion module, and the anode of the fourth diode is electrically connected with the second switch control output end;
a first end of the ninth resistor and a first end of the tenth resistor are both electrically connected with a voltage input end of the second DC-DC chip, a second end of the tenth resistor is electrically connected with the driving output end, a second end of the ninth resistor is electrically connected with a first end of the second adjustable potentiometer, a second end of the second adjustable potentiometer is suspended, an output end of the second adjustable potentiometer is electrically connected with a second end of the tenth resistor, and the driving output end is used as a first port of an output end of the second voltage conversion module;
the control end of the second DC-DC chip is electrically connected with the output end of the knob dimming control module;
a first end of the second inductor is electrically connected with the first switch control output end, and a second end of the second inductor is used as a second port of the output end of the second voltage conversion module;
the fourth capacitor is connected in parallel with the output end of the second voltage conversion module.
Optionally, the dimming driving power circuit further includes a surge absorption module;
the first rectifying and filtering module and the second rectifying and filtering module are electrically connected with the output end of the MLV transformer through the surge absorption module, and the surge absorption module is used for absorbing surges.
Optionally, the surge absorption module includes a fuse and a varistor;
the first end of the fuse is electrically connected with the first port of the output end of the MLV transformer, and the second end of the fuse is electrically connected with the input end of the first rectifying and filtering module;
and the first end of the piezoresistor is electrically connected with the second end of the fuse, and the second end of the piezoresistor is electrically connected with the second port of the output end of the MLV transformer.
According to the technical scheme provided by the embodiment of the invention, the dimming driving power circuit comprising the MLV dimming control module, the MLV transformer, the first rectifying and filtering module, the second rectifying and filtering module, the first voltage conversion module, the second voltage conversion module and the knob dimming control module is adopted, so that the MLV dimming is realized, meanwhile, the brightness customized by the user requirement is provided through the knob dimming function, the requirements of different users for different brightness required by different scenes are met, the power can be stably provided for the lamp, and the energy consumption is saved.
Drawings
Fig. 1 is a schematic structural diagram of a dimming driving power circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a dimming driving power circuit according to an embodiment of the present invention, referring to fig. 1, the driving power circuit includes an MLV dimming control module 11, an MLV transformer 12, a first rectifying and filtering module 13, a second rectifying and filtering module 14, a first voltage conversion module 15, a second voltage conversion module 16, and a knob dimming control module 17;
an input end A1 of the MLV dimming control module 11 is used for inputting alternating current, and an output end A2 of the MLV dimming control module 11 is electrically connected with an input end B1 of the MLV transformer 12;
an input end C1 of the first rectifying and filtering module 13 is electrically connected with an output end B2 of the MLV transformer 12, an output end C2 of the first rectifying and filtering module 13 is electrically connected with an input end D1 of the first voltage conversion module 15, and the first voltage conversion module 15 is used for converting the voltage of the input end D1 and outputting the converted voltage from the output end D2;
the input end G1 of the second voltage conversion module 16 is electrically connected to the output end D2 of the first voltage conversion module 15, the output end G2 of the second voltage conversion module 16 is used for connecting a light emitting device, and the second voltage conversion module 16 is used for adjusting the magnitude of the output signal of the output end G2 according to the signal of the control end G3 so as to drive the electrically connected light emitting device to adjust the light;
the input end E1 of the second rectifying and filtering module 14 is electrically connected with the output end B2 of the MLV transformer 12, and the output end E2 of the second rectifying and filtering module is electrically connected with the first input end F1 of the knob dimming control module 17;
a second input terminal F2 of the knob dimming control module 17 is electrically connected to the output terminal D2 of the first voltage conversion module 15, an output terminal F3 of the knob dimming control module 17 is electrically connected to the control terminal G3 of the second voltage conversion module 16, and a signal output by the output terminal F3 of the knob dimming control module 17 is adjustable.
The dimming driving power circuit provided by the embodiment of the invention is suitable for the output end of an MLV transformer with 9-15V alternating voltage, and different light brightness is realized by knob dimming on the basis of MLV dimming, so that the dimming driving power circuit is suitable for a landscape lighting system. For example, the knob dimming control module 17 controls the voltage of the control terminal G3 of the second voltage conversion module 16, and the second voltage conversion module 16 adjusts the output signal of the output terminal G2 according to the signal of the control terminal G3 to drive the electrically connected light emitting device to dim, wherein the signal output by the output terminal G2 is a current signal.
Specifically, the MLV transformer 12 can output a corresponding voltage according to the control voltage of the MLV dimming control module 11, the first rectifying and filtering module rectifies and filters the voltage output by the MLV transformer 12, converts an alternating current into a direct current to supply power to the first voltage conversion module 15, and the first voltage conversion module 15 converts the voltage at the input end D1 and outputs the converted voltage from the output end D2; the second rectifying and filtering module 14 rectifies and filters the voltage output by the MLV transformer 12, and then provides the voltage for the knob dimming control module 17, the second voltage conversion module 16 receives the control voltage signal provided by the knob dimming control module 17, and outputs the driving current corresponding to the control voltage signal, and the light emitting device can adjust the magnitude of the output driving current according to the control voltage signal, and the light brightness can be changed according to the magnitude of the output driving current.
According to the technical scheme provided by the embodiment of the invention, the dimming driving power circuit comprising the MLV dimming control module 11, the MLV transformer 12, the first rectifying and filtering module 13, the second rectifying and filtering module 14, the first voltage conversion module 15, the second voltage conversion module 16 and the knob dimming control module 17 is adopted, the first rectifying and filtering module 13 and the second rectifying and filtering module 14 respectively rectify and filter the output voltage of the MLV transformer 12, the obtained voltage respectively supplies power to the first voltage conversion module 15 and the knob dimming control module 17, the signal output by the output end of the knob dimming control module 17 is adjustable, and the second voltage conversion module 16 adjusts the size of the output signal of the output end according to the signal of the control end so as to drive the electrically connected light-emitting devices to dim. The dimming driving power circuit provided by the embodiment of the invention can be simultaneously applied to MLV dimming and knob dimming, and has the advantages of strong dimming compatibility, wide dimming range and good dimming effect.
Optionally, fig. 2 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention, and referring to fig. 2, the first rectifying and filtering module 13 includes: the MLV transformer 12 comprises a full-wave rectifier bridge stack BR1 and a first capacitor C1, wherein an input end of the full-wave rectifier bridge stack BR1 is electrically connected with an output end of the MLV transformer 12, an output end of the full-wave rectifier bridge stack BR1 is electrically connected with an input end of the first voltage conversion module 15, and the first capacitor C1 is connected in parallel with an output end of the rectifier bridge stack BR 1.
The second rectifying and filtering module 14 includes: a first diode D1 and a second diode D2;
an anode of the first diode D1 and an anode of the second diode D2 are electrically connected to the first port and the second port of the output terminal B2 of the MLV transformer 12, respectively, and a cathode of the first diode D1 and a cathode of the second diode D2 are both electrically connected to the first input F1 of the knob dimming control module 17.
Specifically, the first rectifying and filtering module 13 and the second rectifying and filtering module 14 may be both composed of a diode and a capacitor, and the unidirectional conductivity of the diode is utilized to convert the alternating current into the unidirectional pulsating direct current. The first rectifying and filtering module 13 is a full-wave rectifier, and is rectified by a full-wave rectifier bridge BR1, and the full-wave rectifier bridge BR1 is formed by connecting four diodes in series and in parallel; the second rectifying and filtering module 14 is half-wave rectifying and is composed of two diodes. During one half cycle, current flows through one diode, and during the other half cycle, current flows through the second diode, and the two diodes are connected such that current flowing through them flows in the same direction through the load. The rectification and filtering module is simple in structure and easy to integrate, and the cost of the driving power supply circuit is favorably reduced by adopting the rectifier bridge stack and the diode for rectification.
Optionally, fig. 3 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention, referring to fig. 3, the knob dimming control module 17 includes a first voltage dividing circuit 171, a first resistor R1, a first adjustable potentiometer VR1, and a transistor Q2;
a first end of the first adjustable potentiometer VR1 is electrically connected with a cathode of the first diode D1 and a cathode of the second diode D2, and a second end of the first adjustable potentiometer VR1 is grounded through a first resistor R1;
a control terminal F4 of the transistor Q2 is electrically connected to the output terminal of the first adjustable potentiometer VR1, a first terminal F5 of the transistor Q2 is electrically connected to the output terminal D2 of the first voltage conversion module 15, a second terminal F6 of the transistor Q2 is electrically connected to the first terminal of the first voltage dividing circuit 171, the second terminal of the first voltage dividing circuit 171 is grounded, and the output terminal of the first voltage dividing circuit 171 is electrically connected to the control terminal G3 of the second voltage conversion module 16.
Specifically, the first voltage dividing circuit 171, the first resistor R1, the first adjustable potentiometer VR1, and the transistor Q2 form the knob dimming control module 17, the voltage output by the second rectifying and filtering module 14 is divided by the first resistor R1 and the first adjustable potentiometer VR1 to provide a small current for the control electrode F4 of the transistor Q2, so as to drive the transistor Q2, the control electrode F4 receives the divided voltage signal and continuously divides the voltage by the voltage dividing circuit 171 electrically connected to the second electrode F6 of the transistor Q2, and the first voltage dividing circuit 171 outputs the divided voltage signal to the control terminal G3 of the second voltage converting module 16 to provide a power signal for the second voltage converting module 16. The voltage value of the output end F3 of the knob dimming control module 17 is changed by adjusting the resistance value of the first adjustable potentiometer VR1, so that the effect of continuous dimming is achieved. The transistor Q2 is used for amplifying the output current, when the electric potential of the control electrode F4 of the transistor Q2 is higher than the electric potential of the first electrode F5, the PN junction between the control electrode F4 of the transistor Q2 and the second electrode F6 is positively biased; when the potential of the control electrode F4 of the transistor Q2 is lower than the potential of the first electrode F5, the PN junction between the control electrode F4 and the first electrode F5 of the transistor Q2 is reversely biased, and a small current is applied to the first electrode F5, so that the current at the first electrode F5 is increased according to the continuity of the current, and in practical application, the current amplification effect of the transistor is often converted into the voltage amplification effect through a resistor.
According to the technical scheme of the embodiment of the invention, the voltage signal is amplified through the triode by matching the knob adjustable potentiometer and the divider resistor and is output to the control end of the second voltage conversion module, so that the control capability and stability of the output signal are improved, and the signal output by the knob dimming control module 17 is matched with the second voltage conversion module 16.
Optionally, fig. 4 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention, referring to fig. 4, the second rectifying and filtering module 14 further includes a second resistor R2, a second capacitor C2, and a zener diode ZD 1; the cathode of the first diode D1 and the cathode of the second diode D2 are both electrically connected with the first end of the first adjustable potentiometer VR1 through a second resistor R2; a first end of a second capacitor C2 is electrically connected with a first end of a first adjustable potentiometer VR1, and a second end of the second capacitor C2 is grounded;
the voltage stabilizing diode ZD1 is connected with the second capacitor C2 in parallel;
the first voltage dividing circuit 171 includes a third resistor R3 and a fourth resistor R4, a first end of the third resistor R3 serves as a first end of the first voltage dividing circuit 171, a second end of the third resistor R3 is electrically connected to a first end of the fourth resistor R4 and serves as an output end of the first voltage dividing circuit 171, and a second end of the fourth resistor R4 serves as a second end of the first voltage dividing circuit 171.
Specifically, a first diode D1 and a second diode D2 rectify the ac voltage signal output by the MLV transformer 12, a cathode of the first diode D1 and a cathode of the second diode D2 are both electrically connected to a first end of the first adjustable potentiometer VR1 through a second resistor R2, and a second resistor R2 is connected in series between the input end E1 and the output end E2 of the second rectifying and filtering module 14, so as to perform a damping function. The second capacitor C2 filters the rectified output signal to filter out noise signals, the rectified and filtered voltage signal may not stably maintain a uniform voltage value, and in order to protect the voltage signal received at the control terminal G3 of the second voltage conversion module 16 from exceeding a limit value, the output voltage of the second rectification filter module 14 needs to be subjected to voltage stabilization and peak clipping through the voltage stabilization diode ZD 1. The first voltage dividing circuit 171 is composed of a third resistor R3 and a fourth resistor R4, and is configured to limit the output current of the transistor Q2, and simultaneously convert the output current signal into an output voltage signal to provide a control voltage for the second voltage conversion module.
According to the technical scheme of the embodiment of the invention, the second resistor R2, the second capacitor C2, the voltage stabilizing diode ZD1, the third resistor R3 and the fourth resistor R4 are adopted, so that the output voltages of the second rectifying and filtering module 14 and the knob dimming control module 17 are limited, the second voltage conversion module 16 is protected from being broken down due to overhigh voltage, and the stability and the reliability of the dimming driving power supply circuit are improved.
Optionally, fig. 5 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention, and referring to fig. 5, the first voltage conversion module includes: the first DC-DC chip U1, the first switching tube Q1, the fifth resistor R5, the sixth resistor R6, the first inductor L1, the third capacitor C3, the third diode D3 and the second voltage division circuit 157; the first DC-DC chip U1 includes a voltage input terminal 5, a current sampling input terminal 7, a switching signal output terminal 1, and a feedback voltage input terminal 2;
a voltage input end 5 of the first DC-DC chip U1 is electrically connected to an output end C2 of the first rectifying and filtering module 13, a first end of a fifth resistor R5 is electrically connected to the voltage input end 5, a second end of the fifth resistor R5 is electrically connected to the current sampling input end 7 and a first end of a first inductor L1, a second end of the first inductor L1 is electrically connected to an anode of a third diode D3, and a cathode of the third diode D3 is electrically connected to an output end D2 of the first voltage conversion module 15;
a control end of the first switch tube Q1 is electrically connected with the switching signal output end 1 through a sixth resistor R6, a first end of the first switch tube Q1 is electrically connected with a second end of the first inductor L1, and a second end of the first switch tube Q1 is grounded;
a first end of the second voltage division circuit 157 is electrically connected with a second end of the first inductor L1, a second end of the second voltage division circuit 157 is grounded, and an output end of the second voltage division circuit 157 is electrically connected with the feedback voltage input end 2;
a first end of the third capacitor C3 is electrically connected with the cathode of the third diode D3, and a second end of the third capacitor C3 is grounded;
the second voltage division circuit 157 includes a seventh resistor R7 and an eighth resistor R8;
a first end of the seventh resistor R7 is used as a first end of the second voltage divider circuit 157, a second end of the seventh resistor R7 is electrically connected to a first end of the eighth resistor R8 to be an output end of the second voltage divider circuit 157, and a second end of the eighth resistor R8 is used as a second end of the second voltage divider circuit 157.
Specifically, the first DC-DC chip U1 is a boost converter chip for implementing voltage conversion, the voltage input terminal 5 of the first DC-DC chip U1 is provided with a voltage by the first rectifying and filtering module 13, the fifth resistor R5 is a detection resistor for setting the maximum output current of the first DC-DC chip U1, and the boost conversion is implemented by the first inductor L1, the third capacitor C3, the third diode D3 and the first switching tube Q1. For example, the ac voltage output by the MLV transformer 12 is converted into dc power through the first rectifying and filtering module 13, when the first switching tube Q1 is turned on, the dc voltage signal is stored through the first inductor L1, the current in the first inductor L1 increases linearly at a certain ratio, which is related to the size of the first inductor L1, as the inductor current increases, some energy is stored in the inductor, and the voltage in the third capacitor C3 supplies power to the load; when the first switch Q1 is turned off, the first inductor L1 releases energy, that is, the first inductor L1 starts to charge the third capacitor C3, the voltage across the third capacitor C3 rises, and at this time, the voltage is higher than the input voltage, and the voltage rise is completed. The third capacitor C3 is an electrolytic capacitor with a large capacity, and filters an output signal of the first DC-DC chip U1, so as to reduce a ripple of an output voltage and ensure stability of input of the second voltage conversion module 16.
According to the technical scheme of the embodiment of the invention, the voltage conversion is realized through the first DC-DC chip U1, and the boosting process is realized by controlling the on and off of the first switch tube Q1. The first switch tube Q1 is an external N-type field effect transistor, so that the power loss of the internal field effect transistor of the first DC-DC chip U1 can be reduced, and the output efficiency can be improved.
Optionally, fig. 6 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention, and referring to fig. 6, the second voltage conversion module 16 includes: a second DC-DC chip U2, a ninth resistor R9, a tenth resistor R10, a second adjustable potentiometer VR2, a fourth diode D4, a fourth capacitor C4 and a second inductor L2; the second DC-DC chip U2 includes a voltage input terminal 5, a driving output terminal 1, a first switch control output terminal 7, a second switch control output terminal 8, and a control terminal 4;
the voltage input end 5 of the second DC-DC chip U2 and the cathode of the fourth diode D4 are both electrically connected to the output end D2 of the first voltage conversion module 15, and the anode of the fourth diode D4 is electrically connected to the second switch control output end 8;
a first end of a ninth resistor R9 and a first end of a tenth resistor R10 are both electrically connected to a voltage input terminal 5 of the second DC-DC chip U2, a second end of the tenth resistor R10 is electrically connected to a driving output terminal 1, a second end of the ninth resistor R9 is electrically connected to a first end of a second adjustable potentiometer VR2, a second end of the second adjustable potentiometer VR2 is floating, an output terminal of the second adjustable potentiometer VR2 is electrically connected to a second end of the tenth resistor R10, and the driving output terminal 1 serves as a first port of an output terminal G2 of the second voltage conversion module 16;
the control terminal 4 of the second DC-DC chip U2 is electrically connected with the output terminal F3 of the knob dimming control module 17;
a first end of the second inductor L2 is electrically connected to the first switch control output terminal 7, and a second end of the second inductor L2 serves as a second port of the output terminal G2 of the second voltage conversion module 16;
the fourth capacitor C4 is connected in parallel to the output terminal of the second voltage converting module 16.
Specifically, the second DC-DC chip U2 is a buck chip with a built-in field effect transistor, and a buck conversion circuit is integrated therein for performing voltage conversion, thereby realizing the adjustment of the output current. The voltage input end 5 of the second DC-DC chip U2 is powered by the output end D2 of the first voltage conversion module 15, and the output current value of the second DC-DC chip U2 driving output end 1 is set through the ninth resistor R9, the tenth resistor R10 and the second adjustable potentiometer VR2, and the output current is used for driving the light emitting device to emit light, and different light intensities can be corresponded according to different output current values. When the forward voltage drop value difference of the light-emitting device is large, the output current value can be finely adjusted through the second adjustable potentiometer VR2, the output power of the lamp can be accurately controlled, and accurate light control is achieved. The voltage reduction conversion is realized through a field effect transistor, a second inductor L2 and a fourth diode D4 which are arranged in a second DC-DC chip U2, a control end 4 of the second DC-DC chip U2 outputs a current signal corresponding to a control signal according to a received control signal, the adjustment of the output current value of a driving output end 1 is realized, and when the voltage value of the control signal received by the control end 4 is 0.1V-2.5V, the full-range dimming of 0-100% can be realized.
According to the technical scheme of the embodiment of the invention, the output current value of the driving output end 1 is adjusted in real time by controlling the size of the control signal received by the control end 4 of the second DC-DC chip U2, so that the full-range dimming of 0-100% is realized, and the output current value can be finely adjusted by the second adjustable potentiometer VR2, so that the accurate light control is realized.
Optionally, fig. 7 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention, referring to fig. 7, the dimming driving power circuit further includes a surge absorption module, the first rectifying and filtering module 13 and the second rectifying and filtering module 14 are electrically connected to the output end B2 of the MLV transformer 12 through the surge absorption module 18, and the surge absorption module 18 is configured to absorb a surge.
In practical application, the voltage output by the MLV transformer has a large surge, and the surge can be absorbed by the surge absorption module 18, so that the input voltages of the first rectifying and filtering module 13 and the second rectifying and filtering module 14 are stable voltages, thereby protecting the circuits behind the system. The surge absorption module 18 can react to abnormal voltage on the line, absorb most of surge energy, and simultaneously restrain the abnormal voltage to a safe range to improve the safety and stability of the line.
Optionally, fig. 8 is a schematic structural diagram of another dimming driving power circuit according to an embodiment of the present invention, referring to fig. 8, including an MLV dimming control module 11, an MLV transformer 12, a first rectifying and filtering module 13, a second rectifying and filtering module 14, a first voltage conversion module 15, a second voltage conversion module 16, a knob dimming control module 17, and a surge absorption module 18;
the surge absorption module 18 comprises a fuse F1 and a voltage dependent resistor MVR;
a first end of the fuse F1 is electrically connected with a first port of the output end of the MLV transformer 12, and a second end of the fuse F1 is electrically connected with the input end of the first rectifying and filtering module 13; the first end of the voltage dependent resistor MVR is electrically connected with the second end of the fuse F1, and the second end of the voltage dependent resistor MVR is electrically connected with the second port of the output end of the MLV transformer 12.
The input end of the MLV dimming control module 11 is used for inputting alternating current, and the output end of the MLV dimming control module 11 is electrically connected with the input end of the MLV transformer 12;
the input end of the first rectifying and filtering module 13 is electrically connected with the output end of the MLV transformer 12, the output end of the first rectifying and filtering module 13 is electrically connected with the input end of the first voltage conversion module 15, and the first voltage conversion module 15 is used for converting the voltage at the input end and then outputting the converted voltage from the output end;
the input end of the second voltage conversion module 16 is electrically connected with the output end of the first voltage conversion module 15, the output end of the second voltage conversion module 16 is used for connecting a light-emitting device, and the second voltage conversion module 16 is used for adjusting the output signal of the output end according to the signal of the control end so as to drive the electrically connected light-emitting device to adjust the light;
the input end of the second rectifying and filtering module 14 is electrically connected with the output end of the MLV transformer 12, and the output end of the second rectifying and filtering module is electrically connected with the first input end of the knob dimming control module 17;
a second input end of the knob dimming control module 17 is electrically connected with an output end of the first voltage conversion module 15, an output end of the knob dimming control module 17 is electrically connected with a control end of the second voltage conversion module 16, and a signal output by the output end of the knob dimming control module 17 is adjustable;
the first rectifying and filtering module 13 and the second rectifying and filtering module 14 are electrically connected to the output end of the MLV transformer 12 through a surge absorption module 18, and the surge absorption module 18 is used for absorbing a surge.
The specific working principle of the dimming driving power supply circuit is as follows:
the MLV dimming control module 11 and the MLV transformer 12 convert alternating current mains supply into low-voltage alternating current 9-15V for MLV dimming; the voltage signal output by the MLV transformer 12 absorbs the surge through the fuse F1 and the voltage dependent resistor MVR to protect the following lines; the first rectifying and filtering module 13 is a full-wave rectifying and filtering circuit, performs full-wave rectification through a bridge rectifier BR1, and performs filtering through a first capacitor C1 after rectification, so that the high power factor of the input voltage is ensured, and the capacitance value of the first capacitor C1 is less than 10 uF; the first voltage conversion module 15 is a BOOST voltage conversion circuit of DC-DC type, and the operating frequency of the first DC-DC chip U1 is set by the sixth capacitor C6 and the seventh capacitor C7, and the first DC-DC chip U1 may be a DC-DC conversion chip of AP34063 type. The maximum output current is set through the fifth resistor R5, the output voltage value is set to be 30V direct current voltage through the sixth diode D6, the seventh resistor R7 and the eighth resistor R8 voltage division feedback detection circuit, BOOST voltage conversion is achieved through the first inductor L1, the first switch tube Q1 and the third diode D3, the power consumption of the first DC-DC chip U1 can be reduced through the first switch tube Q1, the output power is improved, then the boosted voltage is filtered through the large-capacity electrolytic capacitor C3 to reduce output ripples, the input stability of a circuit at the next stage is guaranteed, and the efficiency is improved. The second voltage conversion module 16 is a STEP DOWN conversion circuit controlled by a second DC-DC chip U2 with switching tubes built in, the second DC-DC chip U2 may be a DC-DC conversion chip model AL8807, an output current value is set through the ninth resistor R9, the tenth resistor R10 and the second adjustable potentiometer VR2, the output current supplies power to the light-emitting device, the light-emitting device can be an LED load, when the forward voltage drop value of the LED load is large in difference, the output current can be finely adjusted by the second adjustable potentiometer VR2, the power value output by the whole lamp can be accurately controlled, and to achieve accurate light control, the fourth capacitor is connected in parallel to the output end of the second voltage conversion module 16, and the output voltage is filtered, the eighth capacitor C8 is a bypass filter capacitor of the second DC-DC chip U2, and the circuit realizes voltage STEP DOWN conversion through the fourth diode D4 and the second inductor L2. The second rectifying and filtering module 14 is a half-wave rectifying and filtering circuit, and is composed of a first diode D1, a second diode D2, a second resistor R2 and a second capacitor C2, wherein the first diode D1 and the second diode D2 form a half-wave rectifying circuit, and rectify an input ac voltage into a dc voltage, the second resistor R2 plays a role in damping, and the second capacitor C2 is used for filtering. The knob dimming control module 17 divides voltage by a first adjustable potentiometer VR1 and a first resistor R1, the signal is filtered and delayed by a ninth capacitor C9 and then provided to a base of an NPN triode Q2 to form a divided voltage value, and at the same time, the signal is divided by an emitter of the NPN triode Q2 via a third resistor R3 and a fourth resistor R4 and then provided to a control pin of a second DC-DC chip U2 to form a control voltage signal, the control pin of the second DC-DC chip U2 receives the control signal and operates through an internally fixed STEP DOWN conversion circuit to realize the function of adjusting the output current, and a voltage stabilizing diode ZD1 is used for stabilizing and clipping the peak to prevent the control pin voltage of the second DC-DC chip U2 from exceeding a limit value to protect the output current.
The knob dimming is realized by changing the voltage control of the control pin of the second DC-DC chip U2 through the voltage division of the first adjustable potentiometer VR1, and the MLV dimming is realized by changing the voltage value of the control pin of the second DC-DC chip U2 by sending a phase-cut signal to the base of the NPN triode Q2 through the second rectifying and filtering module 14 and the knob dimming control module 17 by a changed voltage mean value, so that the control of the output current of the second DC-DC chip U2 is realized, and the MLV dimming is realized. The MLV dimming and the knob dimming both need to change the voltage value of a control pin of the second DC-DC chip U2 through the knob dimming control module, so that the control of the output current of the second DC-DC chip U2 is realized, the dimming is realized, and the dimming range of 0-100% can be realized when the voltage value of the control pin is 0.1-2.5V.
The dimming driving power circuit provided by the embodiment of the invention can be simultaneously applied to MLV dimming and knob dimming, and has the advantages of strong dimming compatibility, wide dimming range, good dimming effect and low temperature drift.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A dimming driving power circuit is characterized by comprising an electromagnetic low-voltage MLV dimming control module, an MLV transformer, a first rectifying and filtering module, a second rectifying and filtering module, a first voltage conversion module, a second voltage conversion module and a knob dimming control module;
the input end of the MLV dimming control module is used for inputting alternating current, and the output end of the MLV dimming control module is electrically connected with the input end of the MLV transformer;
the input end of the first rectifying and filtering module is electrically connected with the output end of the MLV transformer, the output end of the first rectifying and filtering module is electrically connected with the input end of the first voltage conversion module, and the first voltage conversion module is used for converting the voltage at the input end and then outputting the converted voltage from the output end;
the input end of the second voltage conversion module is electrically connected with the output end of the first voltage conversion module, the output end of the second voltage conversion module is used for connecting a light-emitting device, and the second voltage conversion module is used for adjusting the size of an output signal of the output end according to a signal of the control end so as to drive the electrically connected light-emitting device to adjust light;
the input end of the second rectifying and filtering module is electrically connected with the output end of the MLV transformer, and the output end of the second rectifying and filtering module is electrically connected with the first input end of the knob dimming control module;
a second input end of the knob dimming control module is electrically connected with an output end of the first voltage conversion module, an output end of the knob dimming control module is electrically connected with a control end of the second voltage conversion module, and a signal output by the output end of the knob dimming control module is adjustable;
the second voltage conversion module includes: the second DC-DC chip, a ninth resistor, a tenth resistor, a second adjustable potentiometer, a fourth diode, a fourth capacitor and a second inductor; the second DC-DC chip comprises a voltage input end, a driving output end, a first switch control output end, a second switch control output end and a control end;
the voltage input end of the second DC-DC chip and the cathode of the fourth diode are electrically connected with the output end of the first voltage conversion module, and the anode of the fourth diode is electrically connected with the second switch control output end;
a first end of the ninth resistor and a first end of the tenth resistor are both electrically connected with a voltage input end of the second DC-DC chip, a second end of the tenth resistor is electrically connected with the driving output end, a second end of the ninth resistor is electrically connected with a first end of the second adjustable potentiometer, a second end of the second adjustable potentiometer is suspended, an output end of the second adjustable potentiometer is electrically connected with a second end of the tenth resistor, and the driving output end is used as a first port of an output end of the second voltage conversion module;
the control end of the second DC-DC chip is electrically connected with the output end of the knob dimming control module;
a first end of the second inductor is electrically connected with the first switch control output end, and a second end of the second inductor is used as a second port of the output end of the second voltage conversion module;
the fourth capacitor is connected in parallel with the output end of the second voltage conversion module.
2. The dimming driving power supply circuit according to claim 1,
the first rectifying and filtering module comprises: the MLV transformer comprises a full-wave rectifier bridge stack and a first capacitor, wherein the input end of the full-wave rectifier bridge stack is electrically connected with the output end of the MLV transformer, the output end of the full-wave rectifier bridge stack is electrically connected with the input end of the first voltage conversion module, and the first capacitor is connected in parallel with the output end of the rectifier bridge stack.
3. The dimming driving power supply circuit according to claim 1,
the second rectifying and filtering module comprises: a first diode and a second diode;
the anode of the first diode and the anode of the second diode are respectively and electrically connected with the first port and the second port of the output end of the MLV transformer, and the cathode of the first diode and the cathode of the second diode are both electrically connected with the first input end of the knob dimming control module.
4. The dimming driving power supply circuit according to claim 3,
the knob dimming control module comprises a first voltage division circuit, a first resistor, a first adjustable potentiometer and a triode;
the first end of the first adjustable potentiometer is electrically connected with the cathode of the first diode and the cathode of the second diode, and the second end of the first adjustable potentiometer is grounded through the first resistor;
the control electrode of the triode is electrically connected with the output end of the first adjustable potentiometer, the first electrode of the triode is electrically connected with the output end of the first voltage conversion module, the second electrode of the triode is electrically connected with the first end of the voltage division circuit, the second end of the first voltage division circuit is grounded, and the output end of the first voltage division circuit is electrically connected with the control end of the second voltage conversion module.
5. The dimming driving power supply circuit according to claim 4, wherein the second rectifying and filtering module further comprises a second resistor, a second capacitor and a zener diode; the cathode of the first diode and the cathode of the second diode are both electrically connected with the first end of the first adjustable potentiometer through the second resistor; the first end of the second capacitor is electrically connected with the first end of the first adjustable potentiometer, and the second end of the second capacitor is grounded;
the voltage stabilizing diode is connected with the second capacitor in parallel;
the first voltage division circuit comprises a third resistor and a fourth resistor, wherein a first end of the third resistor is used as a first end of the first voltage division circuit, a second end of the third resistor is electrically connected with a first end of the fourth resistor and is used as an output end of the first voltage division circuit, and a second end of the fourth resistor is used as a second end of the first voltage division circuit.
6. The dimming driving power supply circuit according to claim 1, wherein the first voltage conversion module comprises: the first DC-DC chip, the first switching tube, the fifth resistor, the sixth resistor, the first inductor, the third capacitor, the third diode and the second voltage division circuit; wherein the first DC-DC chip comprises a voltage input terminal, a current sampling input terminal, a switching signal output terminal and a feedback voltage input terminal;
a voltage input end of the first DC-DC chip is electrically connected to an output end of the first rectifying and filtering module, a first end of the fifth resistor is electrically connected to the voltage input end, a second end of the fifth resistor is electrically connected to the current sampling input end and a first end of the first inductor, a second end of the first inductor is electrically connected to an anode of the third diode, and a cathode of the third diode is electrically connected to an output end of the first voltage converting module;
the control end of the first switch tube is electrically connected with the switch signal output end through the sixth resistor, the first end of the first switch tube is electrically connected with the second end of the second inductor, and the second end of the first switch tube is grounded;
a first end of the second voltage division circuit is electrically connected with a second end of the first inductor, a second end of the second voltage division circuit is grounded, and an output end of the second voltage division circuit is electrically connected with the feedback voltage input end;
the first end of the third capacitor is electrically connected with the cathode of the third diode, and the second end of the third capacitor is grounded.
7. The dimming driving power supply circuit according to claim 6, wherein the second voltage division circuit comprises a seventh resistor and an eighth resistor;
a first end of the seventh resistor is used as a first end of the second voltage-dividing circuit, a second end of the seventh resistor is electrically connected with a first end of the eighth resistor to be used as an output end of the second voltage-dividing circuit, and a second end of the eighth resistor is used as a second end of the second voltage-dividing circuit.
8. The dimming driving power supply circuit according to claim 1, further comprising a surge absorption module;
the first rectifying and filtering module and the second rectifying and filtering module are electrically connected with the output end of the MLV transformer through the surge absorption module, and the surge absorption module is used for absorbing surges.
9. The dimming driving power supply circuit according to claim 8, wherein the surge absorption module comprises a fuse and a voltage dependent resistor;
the first end of the fuse is electrically connected with the first port of the output end of the MLV transformer, and the second end of the fuse is electrically connected with the input end of the first rectifying and filtering module;
and the first end of the piezoresistor is electrically connected with the second end of the fuse, and the second end of the piezoresistor is electrically connected with the second port of the output end of the MLV transformer.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101584249A (en) * | 2006-03-17 | 2009-11-18 | 路创电子公司 | Dimmer for preventing asymmetric current flow through an unloaded magnetic low-voltage transformer |
| CN101827486A (en) * | 2010-03-31 | 2010-09-08 | 苏州达方电子有限公司 | Light tube module |
| CN202721870U (en) * | 2012-07-31 | 2013-02-06 | 四川新力光源股份有限公司 | Built-in dimming driving module for LED |
| CN203313463U (en) * | 2013-05-03 | 2013-11-27 | 深圳市雷达光电科技有限公司 | DC power supply system of indoor LED lighting lamps |
| CN203590552U (en) * | 2013-11-11 | 2014-05-07 | 深圳市九洲光电科技有限公司 | Dimmable drive circuit used for LED MR16 spotlight |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8274233B2 (en) * | 2008-11-25 | 2012-09-25 | Lutron Electronics Co., Inc. | Load control device having a visual indication of energy savings and usage information |
-
2019
- 2019-06-06 CN CN201910493484.0A patent/CN110225617B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101584249A (en) * | 2006-03-17 | 2009-11-18 | 路创电子公司 | Dimmer for preventing asymmetric current flow through an unloaded magnetic low-voltage transformer |
| CN101827486A (en) * | 2010-03-31 | 2010-09-08 | 苏州达方电子有限公司 | Light tube module |
| CN202721870U (en) * | 2012-07-31 | 2013-02-06 | 四川新力光源股份有限公司 | Built-in dimming driving module for LED |
| CN203313463U (en) * | 2013-05-03 | 2013-11-27 | 深圳市雷达光电科技有限公司 | DC power supply system of indoor LED lighting lamps |
| CN203590552U (en) * | 2013-11-11 | 2014-05-07 | 深圳市九洲光电科技有限公司 | Dimmable drive circuit used for LED MR16 spotlight |
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