CN103841714B - LED dimming driving circuit - Google Patents
LED dimming driving circuit Download PDFInfo
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- CN103841714B CN103841714B CN201210491298.1A CN201210491298A CN103841714B CN 103841714 B CN103841714 B CN 103841714B CN 201210491298 A CN201210491298 A CN 201210491298A CN 103841714 B CN103841714 B CN 103841714B
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Abstract
A kind of LED dimming driving circuit, comprising power module and the driver module for sending drive singal, also comprising dimming controlling module, switch module and voltage regulating module; Described power module is used for providing working power for described dimming controlling module, described switch module and described voltage regulating module, wherein, described dimming controlling module sends drive singal according to described driving and sends dim signal, after described switch module receives the dim signal of described dimming controlling module, described switch module conducting, the dim signal that described voltage regulating module controls to transmit according to described switch module exports corresponding magnitude of voltage to described LED.Namely from the LED that voltage regulating module connects, there is multiple different operating voltage, thus can realize regulating the multiple light intensity illumination of LED.
Description
Technical field
The present invention relates to LED drive circuit, particularly relate to a kind of LED dimming driving circuit with many frequency modulated lights photograph intensity adjustment function.
Background technology
LED is widely used as light source, has also occurred various LED drive circuit thereupon.Because LED self is harsher to operating voltage requirement, overtension is too low all can cause LED operating current fluctuation, so the general type of drive that will adopt constant current voltage limiting to LED.Thus, when LED is as current mode operating load, the electric current flowing through LED must ensure within rated current.In the low-voltage place of direct current, the integrated high-frequency model design LED of integration that adopts drives more at present, but these type of drive are all firm powers to be exported, can not regulate power output, and then intensity of illumination can not regulate, bring serious inconvenience to user.
Summary of the invention
Based on this, provide a kind of and there is the LED dimming driving circuit of many frequency modulated lights according to intensity adjustment function.
A kind of LED dimming driving circuit, comprising power module and the driver module for sending drive singal, also comprising dimming controlling module, switch module and voltage regulating module;
Described power module is used for providing working power for described dimming controlling module, described switch module and described voltage regulating module, and described power module comprises the first output be connected with described voltage regulating module and the second output be connected with described dimming controlling module;
Described driver module comprises the output be connected with described dimming controlling module;
Described dimming controlling module comprise the power input be connected with described power module, the input be connected with described driver module, the calibration terminal of input reference voltage, ground connection earth terminal, export the output of dim signal;
The output that described switch module comprises the power input be connected with power module first output, the input be connected with the output of described dimming controlling module and is connected with the input of described voltage regulating module;
The output of described voltage regulating module is used for being connected with LED;
Wherein, described dimming controlling module sends drive singal according to described driving and sends dim signal, after described switch module receives the dim signal of described dimming controlling module, described switch module conducting, the dim signal that described voltage regulating module controls to transmit according to described switch module exports corresponding magnitude of voltage to described LED.
Wherein in an embodiment, the output of described dimming controlling module comprises the first output of output first dim signal, exports the 3rd output of the second output of the second dim signal and output the 3rd dim signal;
Described switch module comprises one-level switch, secondary switch and three step switch; Described one-level switch, described secondary switch are all connected with the first output of described power module with the power input of described three step switch, corresponding the first output, the second output and the 3rd output with described dimming controlling module of the input of the input of described one-level switch, the input of described secondary switch and described three step switch is connected, and the output of described one-level switch, the output of described secondary switch are all connected with the input of described voltage regulating module with the output of described three step switch;
Wherein, described dimming controlling module exports the first dim signal, the second dim signal and the 3rd dim signal successively according to the drive singal that described driver module sends; After described switch module receives the first dim signal of described dimming controlling module, the second dim signal and the 3rd dim signal successively, the corresponding conducting of described one-level switch, described secondary switch and described three step switch; Described voltage regulating module exports the first voltage when described one-level switch conduction, the second voltage is exported when described secondary switch conducting, export tertiary voltage when described three step switch conducting, when described switch module does not output signal, described voltage regulating module exports the 4th voltage; Described dimming controlling module, under the driving of drive singal, can only export the one in the first dim signal, the second dim signal and the 3rd dim signal at every turn.
Wherein in an embodiment, described power module comprises rectifier bridge D1, electrochemical capacitor C1, voltage stabilizing didoe D2, inductance L 1, electrochemical capacitor C2 and source of stable pressure chip 7805;
Described rectifier bridge D1 input is used for being connected with AC power, and the output of described rectifier bridge D1 is the first output of described power module, the earth terminal ground connection of described rectifier bridge D1;
Described electrochemical capacitor C1 and described voltage stabilizing didoe D2 is parallel between the output and ground of described rectifier bridge D1, and the negative pole of described voltage stabilizing didoe D2 is connected with the output of described rectifier bridge D1;
Described inductance L 1 and described electrochemical capacitor C2 are series between the output and ground of described rectifier bridge D1, described inductance L 1 is connected with the input of described source of stable pressure chip 7805 with the link after described electrochemical capacitor C2 series connection, the earth terminal ground connection of described source of stable pressure chip 7805, the output of described source of stable pressure chip 7805 is the second output of described power module;
Described power module also comprises filter capacitor C7 and filter capacitor C8, between the input that described filter capacitor C7 is parallel to described source of stable pressure chip 7805 and earth terminal, described filter capacitor C8 is parallel between the output and ground of described source of stable pressure chip 7805.
Wherein in an embodiment, described driver module comprises touch-switch SW and divider resistance R10, described touch-switch SW one end ground connection, the other end of described touch-switch SW is connected with one end of described divider resistance R10, and the other end of described divider resistance R10 is the output of described driver module.
Wherein in an embodiment, described dimming controlling module comprises single-chip microcomputer and divider resistance R9, described divider resistance R9 one end is connected with the second output of described power module, the other end is held with the PA7 of described single-chip microcomputer and is connected, the power input of described single-chip microcomputer is connected with the second output of described power module, the PA6 end of described single-chip microcomputer is used for input reference voltage, and the PA0 end of described single-chip microcomputer, PA2 hold and PA5 end is corresponding exports the first dim signal, the second dim signal and the 3rd dim signal;
The tie point that the PA7 of described divider resistance R9 and described single-chip microcomputer holds is the input of described dimming controlling module, and the power input of described single-chip microcomputer, PA6 end, VSS end, PA0 end, PA2 end and PA5 correspond to the voltage input end of described dimming controlling module, calibration terminal, earth terminal, the first output, the second output and the 3rd output.
Wherein in an embodiment, also comprise the reference voltage module be connected with the calibration terminal of described dimming controlling module, described reference voltage module comprises voltage stabilizing chip U3, divider resistance R8 and filter capacitor C9;
The reference edge input reference voltage of described voltage stabilizing chip U3, the reference edge of described voltage stabilizing chip U3 is connected with the negative electrode of described voltage stabilizing chip U3, the plus earth of described voltage stabilizing chip U3, between the negative electrode that described filter capacitor C9 is parallel to described voltage stabilizing chip U3 and anode, one end of described divider resistance R8 is connected with the negative electrode of described voltage stabilizing chip U3, and the other end of described divider resistance R8 is connected with the calibration terminal of described dimming controlling module.
Wherein in an embodiment, the input of described voltage regulating module comprises one-level input, secondary input and three grades of inputs, and one-level input, the secondary input of described voltage regulating module are connected with three grades of inputs are corresponding corresponding with the output of the output of described one-level switch, the output of described secondary switch and described three step switch;
Described voltage regulating module comprises diode D3, diode D4, diode D5 and diode D6;
Described diode D3, described diode D4, described diode D5 and described diode D6 are series between the first output of described power module and the positive pole of LED; The positive pole of described diode D3 is connected with the first output of described power module, and the described negative pole of diode D6 is connected with the positive pole of LED;
The common port of the negative pole of described diode D3 and the positive pole of described diode D4 is described one-level input;
The common port of the negative pole of described diode D4 and the positive pole of described diode D5 is described secondary input;
The common port of the negative pole of described diode D5 and the positive pole of described diode D6 is described three grades of inputs.
Wherein in an embodiment, described one-level switch comprises PNP type triode Q1, NPN type triode Q4, divider resistance R2, divider resistance R5 and filter capacitor C3;
One end of described divider resistance R5 is connected with the first output of described dimming controlling module, and the other end of described divider resistance R5 is connected with the base stage of described NPN type triode Q4; The grounded emitter of described NPN type triode Q4, described divider resistance R2 is series between the collector electrode of described NPN type triode Q4 and the base stage of described PNP type triode Q1, the collector electrode of described PNP type triode Q1 is connected with the one-level input of described voltage regulating module, the emitter of described PNP type triode Q1 is connected with the first output of described power module, described filter capacitor C3 one end is connected with the emitter of described PNP type triode Q1, described filter capacitor C3 other end ground connection.
Wherein in an embodiment, described secondary switch comprises PNP type triode Q2, NPN type triode Q5, divider resistance R3, divider resistance R6 and filter capacitor C4;
One end of described divider resistance R6 is connected with the second output of described dimming controlling module, and the other end of described divider resistance R6 is connected with the base stage of described NPN type triode Q5; The grounded emitter of described NPN type triode Q5, described divider resistance R3 is series between the collector electrode of described NPN type triode Q5 and the base stage of described PNP type triode Q2, the collector electrode of described PNP type triode Q2 is connected with the secondary input of described voltage regulating module, the emitter of described PNP type triode Q2 is connected with the first output of described power module, described filter capacitor C4 one end is connected with the emitter of described PNP type triode Q2, described filter capacitor C4 other end ground connection.
Wherein in an embodiment, described three step switch comprises PNP type triode Q3, NPN type triode Q6, divider resistance R4, divider resistance R7 and filter capacitor C5;
One end of described divider resistance R7 is connected with the 3rd output of described dimming controlling module, and the other end of described divider resistance R7 is connected with the base stage of described NPN type triode Q6; The grounded emitter of described NPN type triode Q6, described divider resistance R4 is series between the collector electrode of described NPN type triode Q6 and the base stage of described PNP type triode Q3, the collector electrode of described PNP type triode Q3 is connected with three grades of inputs of described voltage regulating module, the emitter of described PNP type triode Q3 is connected with the first output of described power module, described filter capacitor C5 one end is connected with the emitter of described PNP type triode Q3, described filter capacitor C5 other end ground connection.
Dimming controlling module in above-mentioned LED dimming driving circuit exports dim signal according to the drive singal of driver module, and voltage regulating module exports according to the dim signal correspondence received the voltage varied in size.After LED receives the magnitude of voltage of different size, luminosity is different, thus can regulate the luminosity of LED.
Concrete, dimming controlling module exports the first dim signal, the second dim signal and the 3rd dim signal according to the drive singal of driver module, and then is transferred to voltage regulating module by the one-level switch of switch module, secondary switch and three step switch correspondence.Voltage regulating module exports the first voltage when receiving the first dim signal, exports the second voltage when voltage regulating module receives the second dim signal, exports tertiary voltage when voltage regulating module receives the 3rd dim signal.When switch module does not receive light modulation, voltage regulating module exports the 4th voltage.Namely from the LED that voltage regulating module connects, there is multiple different operating voltage, thus can realize regulating the multiple light intensity illumination of LED.
Accompanying drawing explanation
Fig. 1 is the module map of LED light adjusting circuit;
Fig. 2 is the schematic diagram of LED light adjusting circuit.
Embodiment
As shown in Figure 1, be the module map of LED light adjusting circuit.
A kind of LED dimming driving circuit, comprising power module 101 and the driver module 103 for sending drive singal, also comprising dimming controlling module 105, switch module 107 and voltage regulating module 109.
Power module 101 is for providing working power for dimming controlling module 105, switch module 107 and voltage regulating module 109, and power module 101 comprises the first output be connected with voltage regulating module 109 and the second output be connected with dimming controlling module 105.
Driver module 103 comprises the output be connected with dimming controlling module 105.
Dimming controlling module 105 comprise the power input be connected with power module 101, the input be connected with driver module 103, the calibration terminal of input reference voltage, ground connection earth terminal, export the output of dim signal.
The output that described switch module 107 comprises the power input be connected with power module first output, the input be connected with the output of described dimming controlling module 105 and is connected with the input of described voltage regulating module 109.
The output of described voltage regulating module 109 is used for being connected with LED.
Wherein, described dimming controlling module 105 sends drive singal according to described driving and sends dim signal, after described switch module 107 receives the dim signal of described dimming controlling module, the conducting of described switch module 107, the dim signal that described voltage regulating module 109 controls to transmit according to described switch module 107 exports corresponding magnitude of voltage to described LED.
Particularly, the output of dimming controlling module 105 comprises the 3rd output of the first output of the first dim signal, the second output exporting the second dim signal and output the 3rd dim signal.
Switch module 107 comprises one-level switch 1071, secondary switch 1072 and three step switch 1073.One-level switch 1071, secondary switch 1072 are all connected with the first output of power module 101 with the power input of three step switch 1073.Corresponding the first output, the second output and the 3rd output with dimming controlling module 105 of the input of the input of one-level switch 1071, the input of secondary switch 1072 and three step switch 1073 is connected, and the output of one-level switch 1071, the output of secondary switch 1072 are all connected with the input of voltage regulating module 109 with the output of three step switch 1073.
The output of voltage regulating module 109 is used for being connected with LED.
Wherein, dimming controlling module 105 exports the first dim signal, the second dim signal and the 3rd dim signal successively according to the drive singal that driver module 103 sends; After switch module 107 receives the first dim signal of dimming controlling module 105, the second dim signal and the 3rd dim signal successively, one-level switch 1071, secondary switch 1072 and the corresponding conducting of three step switch 1073; Voltage regulating module 109 exports the first voltage when 1071 conducting of one-level switch, the second voltage is exported when secondary switch 1072 conducting, export tertiary voltage when three step switch 1072 conducting, when switch module 107 does not output signal, voltage regulating module 109 exports the 4th voltage; Dimming controlling module 105, under the driving of drive singal, can only export the one in the first dim signal, the second dim signal and the 3rd dim signal at every turn.
Power module 101 is for being converted to the operating voltage size needed for dimming controlling module 105, switch module 107 and the voltage regulating module 109 in LED dimming driving circuit by AC power.Especially, be to AC power is converted to close to the operating voltage needed for LED work.
Driver module 103 is for sending drive singal.Dimming controlling module 105 only just can export dim signal after receiving drive singal.The drive singal that driver module 103 sends is similar to pulse signal, is the high level signal of moment.
Dimming controlling module 105 exports dim signal after receiving drive singal successively.Namely, when first time receives drive singal, dimming controlling module 105 exports the first dim signal.Corresponding, when second time receives drive singal, dimming controlling module 105 exports the second dim signal.Third time, when receiving drive singal, dimming controlling module 105 exported the 3rd dim signal.When receiving drive singal the 4th time, dimming controlling module 105 resets, and dimming controlling module 105 does not export dim signal.Wherein, when dimming controlling module 105 receives drive singal, the one in three kinds of dim signals can only be exported, can not simultaneously two kinds and two or more dim signals.
The conducting when receiving corresponding dim signal of one-level switch 1071 in switch module 107, secondary switch 1072 and three step switch 1073.Thus, voltage regulating module 109 exports the first voltage when 1071 conducting of one-level switch, and voltage regulating module 109 exports the second voltage when secondary switch 1072 conducting, and voltage regulating module 109 exports tertiary voltage when three step switch 1073 conducting.When switch module 107 does not output signal, voltage regulating module 109 exports the 4th voltage.Therefore, the LED be connected with voltage regulating module 109 output has four kinds of operating voltages, and namely LED has four kinds of adjustable intensities of illumination.
Incorporated by reference to Fig. 2.
Power module 101 comprises rectifier bridge D1, electrochemical capacitor C1, voltage stabilizing didoe D2, inductance L 1, electrochemical capacitor C2 and source of stable pressure chip 7805.
Rectifier bridge D1 input is used for being connected with AC power, and the output of rectifier bridge D1 is the first output of power module 101, the earth terminal ground connection of rectifier bridge D1.
Electrochemical capacitor C1 and voltage stabilizing didoe D2 is parallel between the output and ground of rectifier bridge D1, and the negative pole of voltage stabilizing didoe D2 is connected with the output of rectifier bridge D1.
Inductance L 1 and electrochemical capacitor C2 are series between the output and ground of rectifier bridge D1, inductance L 1 is connected with the input of source of stable pressure chip 7805 with the link after electrochemical capacitor C2 series connection, the earth terminal ground connection of source of stable pressure chip 7805, the output of source of stable pressure chip 7805 is the second output of power module 101.
Rectifier bridge D1 comprises four ports such as port one, port 2, port 3 and port 4.Wherein port one is connected with the both positive and negative polarity of power supply respectively with port 3, port 4 ground connection, and port 2 is output.AC power is via the direct voltage exporting 12V after rectifier bridge D1 rectification, electrochemical capacitor C1 filtering and voltage stabilizing didoe D2 voltage stabilizing.
Power module 101 also comprises protective tube F1 and thermistor R1.Thermistor R1 is parallel between the port one of rectifier bridge D1 and port 3.One end of protective tube F1 is connected with positive source, and the other end is connected with the port one of rectifier bridge D1.
Power module 101 also comprises filter capacitor C7 and filter capacitor C8, and between the input that filter capacitor C7 is parallel to source of stable pressure chip 7805 and earth terminal, filter capacitor C8 is parallel between the output and ground of source of stable pressure chip 7805.Source of stable pressure chip 7805 converts 12V DC power supply to 5V DC power supply.
Driver module 103 comprises touch-switch SW and divider resistance R10, touch-switch SW one end ground connection, and the other end of touch-switch SW is connected with one end of divider resistance R10, and the other end of divider resistance R10 is the output of driver module.
Touch-switch SW electronic switch, press shift knob during use gently and just can make switch connection, when unclamping hand, switch disconnects.
Dimming controlling module 105 comprises single-chip microcomputer and divider resistance R9, divider resistance R9 one end is connected with the second output of power module 101, the other end is held with the PA7 of single-chip microcomputer and is connected, the power input of single-chip microcomputer is connected with the second output of power module 101, the PA6 end of single-chip microcomputer is used for input reference voltage, and the PA0 end of single-chip microcomputer, PA2 hold and PA5 end is corresponding exports the first dim signal, the second dim signal and the 3rd dim signal.
The tie point that the PA7 of divider resistance R9 and single-chip microcomputer holds is the input of dimming controlling module 105, and the power input of single-chip microcomputer, PA6 end, VSS end, PA0 end, PA2 end and PA5 correspond to the voltage input end of dimming controlling module 105, calibration terminal, earth terminal, the first output, the second output and the 3rd output.
Single-chip microcomputer model is HT66F03C.
LED dimming driving circuit also comprises the reference voltage module 111 be connected with the calibration terminal of dimming controlling module 105, and reference voltage module 111 comprises voltage stabilizing chip U3, divider resistance R8 and filter capacitor C9.
The reference edge input reference voltage of voltage stabilizing chip U3, the reference edge of voltage stabilizing chip U3 is connected with the negative electrode of voltage stabilizing chip U3, the plus earth of voltage stabilizing chip U3, between the negative electrode that filter capacitor C9 is parallel to voltage stabilizing chip U3 and anode, one end of divider resistance R8 is connected with the negative electrode of voltage stabilizing chip U3, and the other end of divider resistance R8 is connected with the calibration terminal of dimming controlling module 105.
The input of voltage regulating module 109 comprises one-level input, secondary input and three grades of inputs, and one-level input, the secondary input of voltage regulating module 109 are connected with three grades of inputs are corresponding corresponding with the output of the output of one-level switch, the output of secondary switch and three step switch.
Voltage regulating module 109 comprises diode D3, diode D4, diode D5 and diode D6.
Diode D3, diode D4, diode D5 and diode D6 are series between the first output of power module 101 and the positive pole of LED; The positive pole of diode D3 is connected with the first output of power module 101, and the negative pole of diode D6 is connected with the positive pole of LED.
The common port of the negative pole of diode D3 and the positive pole of diode D4 is one-level input.
The common port of the negative pole of diode D4 and the positive pole of diode D5 is secondary input.
The common port of the negative pole of diode D5 and the positive pole of diode D6 is three grades of inputs.
One-level switch 1071 comprises PNP type triode Q1, NPN type triode Q4, divider resistance R2, divider resistance R5 and filter capacitor C3.
One end of described divider resistance R5 is connected with the first output of described dimming controlling module 105, the other end of described divider resistance R5 is connected with the base stage of described NPN type triode Q4, the grounded emitter of NPN type triode Q4, divider resistance R2 is series between the collector electrode of NPN type triode Q4 and the base stage of PNP type triode Q1, the collector electrode of PNP type triode Q1 is connected with the one-level input of voltage regulating module 109, the emitter of PNP type triode Q1 is connected with the first output of power module 101, filter capacitor C3 one end is connected with the emitter of PNP type triode Q1, filter capacitor C3 other end ground connection.
Secondary switch 1072 comprises PNP type triode Q2, NPN type triode Q5, divider resistance R3, divider resistance R6 and filter capacitor C4.
One end of divider resistance R6 is connected with the second output of described dimming controlling module 105, the other end of described divider resistance R6 is connected with the base stage of described NPN type triode Q5, the grounded emitter of NPN type triode Q5, divider resistance R3 is series between the collector electrode of NPN type triode Q5 and the base stage of PNP type triode Q2, the collector electrode of PNP type triode Q2 is connected with the secondary input of voltage regulating module 109, the emitter of PNP type triode Q2 is connected with the first output of power module 101, filter capacitor C4 one end is connected with the emitter of PNP type triode Q2, filter capacitor C4 other end ground connection.
Three step switch 1073 comprises PNP type triode Q3, NPN type triode Q6, divider resistance R4, divider resistance R7 and filter capacitor C5.
One end of divider resistance R7 is connected with the 3rd output of described dimming controlling module 105, the other end of described divider resistance R7 is connected with the base stage of described NPN type triode Q6, the grounded emitter of NPN type triode Q6, divider resistance R4 is series between the collector electrode of NPN type triode Q6 and the base stage of PNP type triode Q3, the collector electrode of PNP type triode Q3 is connected with three grades of inputs of voltage regulating module 109, the emitter of PNP type triode Q3 is connected with the first output of power module 101, filter capacitor C5 one end is connected with the emitter of PNP type triode Q3, filter capacitor C5 other end ground connection.
LED dimming driving circuit also comprises filter capacitor C6, and filter capacitor C6 one end is connected with the negative pole of diode D6, other end ground connection.
Based on above-mentioned all embodiments, the operation principle of LED dimming driving circuit is as follows:
The 12V direct voltage of the first output stable output of power module 101, the 5V direct voltage of the second output stable output.12V direct voltage is transferred to LED by voltage regulating module 109.5V direct voltage provides working power for dimming controlling module 105 and switch module 107.
When not pressing touch-switch SW, the single-chip microcomputer in dimming controlling module 105 does not receive drive singal, and therefore, single-chip microcomputer does not output signal.One-level switch 1071 in switch module 107, secondary switch 1072 and three step switch 1073 all not conductings.Now, be equivalent to the direct voltage of 12V directly via after the diode D3 in voltage regulating module 109, diode D4, diode D5 and diode D6 step-down, the voltage of supply LED is 9.2V.Now, LED is in one grade of intensity of illumination.
When first time presses touch-switch SW, the single-chip microcomputer in dimming controlling module 105 receives drive singal, and the PA0 end of single-chip microcomputer exports high level, and the PA2 end of single-chip microcomputer and PA5 hold output low level.Therefore, NPN type triode Q4 conducting, NPN type triode Q5 and NPN type triode Q6 cut-off.The base stage of PNP type triode Q1 is connected with the collector electrode of NPN type triode Q4 by divider resistance R2, and when NPN type triode Q4 conducting, the collector electrode output low level of NPN type triode Q4, so PNP type triode Q1 conducting.Namely 12V direct voltage is via after diode D4, diode D5 and diode D6 step-down, and the voltage of supply LED is 9.8V.Now, LED is in one grade of intensity of illumination.
When second time presses touch-switch SW, the single-chip microcomputer in dimming controlling module 105 receives drive singal, and the PA2 end of single-chip microcomputer exports high level, and the PA0 end of single-chip microcomputer and PA5 hold output low level.Therefore, NPN type triode Q5 conducting, NPN type triode Q4 and NPN type triode Q6 cut-off.The base stage of PNP type triode Q2 is connected with the collector electrode of NPN type triode Q5 by divider resistance R3, and when NPN type triode Q5 conducting, the collector electrode output low level of NPN type triode Q5, so PNP type triode Q2 conducting.Namely 12V direct voltage is via after diode D5 and diode D6 step-down, and the voltage of supply LED is 10.4V.Now, LED is in one grade of intensity of illumination.
When third time presses touch-switch SW, the single-chip microcomputer in dimming controlling module 105 receives drive singal, and the PA5 end of single-chip microcomputer exports high level, and the PA0 end of single-chip microcomputer and PA2 hold output low level.Therefore, NPN type triode Q6 conducting, NPN type triode Q4 and NPN type triode Q5 cut-off.The base stage of PNP type triode Q3 is connected with the collector electrode of NPN type triode Q6 by divider resistance R4, and when NPN type triode Q6 conducting, the collector electrode output low level of NPN type triode Q6, so PNP type triode Q3 conducting.Namely 12V direct voltage is via after diode D6 step-down, and the voltage of supply LED is 11.3V.Now, LED is in one grade of intensity of illumination.
Therefore, when pressing touch-switch SW, LED dimming driving circuit regulates the intensity of illumination of LED always according to above-mentioned four kinds of cycle of states.
In the present embodiment, by increasing the diode number in the switch sum of series voltage regulating module 109 in switch module 107, can regulate to reach more multiextent intensity of illumination.Such as, the increase level Four switch in switch module 107, connects a diode again in voltage regulating module 109 after diode D6.Now, LED dimming driving circuit just has intensity of illumination adjustment in 5.
Dimming controlling module 105 in above-mentioned LED dimming driving circuit exports dim signal according to the drive singal of driver module 103, and voltage regulating module 109 exports according to the dim signal correspondence received the voltage varied in size.After LED receives the magnitude of voltage of different size, luminosity is different, thus can regulate the luminosity of LED.
Concrete, dimming controlling module 105 exports the first dim signal, the second dim signal and the 3rd dim signal according to the drive singal of driver module 103, and then is transferred to voltage regulating module 109 by the one-level switch 1071 of switch module 107, secondary switch 1072 and three step switch 1073 correspondence.Voltage regulating module 109 exports the first voltage when receiving the first dim signal, exports the second voltage when voltage regulating module 109 receives the second dim signal, exports tertiary voltage when voltage regulating module 109 receives the 3rd dim signal.When switch module 107 does not receive light modulation, voltage regulating module 109 exports the 4th voltage.Namely the LED connected from voltage regulating module 109 has multiple different operating voltage, thus can realize regulating the multiple light intensity illumination of LED.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a LED dimming driving circuit, comprising power module and the driver module for sending drive singal, it is characterized in that, also comprise dimming controlling module, switch module and voltage regulating module;
Described power module is used for providing working power for described dimming controlling module, described switch module and described voltage regulating module, and described power module comprises the first output be connected with described voltage regulating module and the second output be connected with described dimming controlling module;
Described driver module comprises the output be connected with described dimming controlling module;
Described dimming controlling module comprise the power input be connected with described power module, the input be connected with described driver module, the calibration terminal of input reference voltage, ground connection earth terminal, export the output of dim signal;
The output that described switch module comprises the power input be connected with power module first output, the input be connected with the output of described dimming controlling module and is connected with the input of described voltage regulating module;
The output of described voltage regulating module is used for being connected with LED;
Wherein, described dimming controlling module sends drive singal according to described driving and sends dim signal, after described switch module receives the dim signal of described dimming controlling module, described switch module conducting, the dim signal that described voltage regulating module controls to transmit according to described switch module exports corresponding magnitude of voltage to described LED; The output of described dimming controlling module comprises the 3rd output of the first output of output first dim signal, the second output exporting the second dim signal and output the 3rd dim signal;
Described switch module comprises one-level switch, secondary switch and three step switch; Described one-level switch, described secondary switch are all connected with the first output of described power module with the power input of described three step switch, corresponding the first output, the second output and the 3rd output with described dimming controlling module of the input of the input of described one-level switch, the input of described secondary switch and described three step switch is connected, and the output of described one-level switch, the output of described secondary switch are all connected with the input of described voltage regulating module with the output of described three step switch;
Wherein, described dimming controlling module exports the first dim signal, the second dim signal and the 3rd dim signal successively according to the drive singal that described driver module sends; After described switch module receives the first dim signal of described dimming controlling module, the second dim signal and the 3rd dim signal successively, the corresponding conducting of described one-level switch, described secondary switch and described three step switch; Described voltage regulating module exports the first voltage when described one-level switch conduction, the second voltage is exported when described secondary switch conducting, export tertiary voltage when described three step switch conducting, when described switch module does not output signal, described voltage regulating module exports the 4th voltage; Described dimming controlling module, under the driving of drive singal, can only export the one in the first dim signal, the second dim signal and the 3rd dim signal at every turn;
The input of described voltage regulating module comprises one-level input, secondary input and three grades of inputs, and one-level input, the secondary input of described voltage regulating module are connected with three grades of inputs are corresponding corresponding with the output of the output of described one-level switch, the output of described secondary switch and described three step switch;
Described voltage regulating module comprises diode D3, diode D4, diode D5 and diode D6;
Described diode D3, described diode D4, described diode D5 and described diode D6 are series between the first output of described power module and the positive pole of LED; The positive pole of described diode D3 is connected with the first output of described power module, and the described negative pole of diode D6 is connected with the positive pole of LED;
The common port of the negative pole of described diode D3 and the positive pole of described diode D4 is described one-level input;
The common port of the negative pole of described diode D4 and the positive pole of described diode D5 is described secondary input;
The common port of the negative pole of described diode D5 and the positive pole of described diode D6 is described three grades of inputs.
2. LED dimming driving circuit according to claim 1, is characterized in that, described power module comprises rectifier bridge D1, electrochemical capacitor C1, voltage stabilizing didoe D2, inductance L 1, electrochemical capacitor C2 and source of stable pressure chip 7805;
Described rectifier bridge D1 input is used for being connected with AC power, and the output of described rectifier bridge D1 is the first output of described power module, the earth terminal ground connection of described rectifier bridge D1;
Described electrochemical capacitor C1 and described voltage stabilizing didoe D2 is parallel between the output and ground of described rectifier bridge D1, and the negative pole of described voltage stabilizing didoe D2 is connected with the output of described rectifier bridge D1;
Described inductance L 1 and described electrochemical capacitor C2 are series between the output and ground of described rectifier bridge D1, described inductance L 1 is connected with the input of described source of stable pressure chip 7805 with the link after described electrochemical capacitor C2 series connection, the earth terminal ground connection of described source of stable pressure chip 7805, the output of described source of stable pressure chip 7805 is the second output of described power module;
Described power module also comprises filter capacitor C7 and filter capacitor C8, between the input that described filter capacitor C7 is parallel to described source of stable pressure chip 7805 and earth terminal, described filter capacitor C8 is parallel between the output and ground of described source of stable pressure chip 7805.
3. LED dimming driving circuit according to claim 1, it is characterized in that, described driver module comprises touch-switch SW and divider resistance R10, described touch-switch SW one end ground connection, the other end of described touch-switch SW is connected with one end of described divider resistance R10, and the other end of described divider resistance R10 is the output of described driver module.
4. LED dimming driving circuit according to claim 1, it is characterized in that, described dimming controlling module comprises single-chip microcomputer and divider resistance R9, described divider resistance R9 one end is connected with the second output of described power module, the other end is held with the PA7 of described single-chip microcomputer and is connected, the power input of described single-chip microcomputer is connected with the second output of described power module, the PA6 end of described single-chip microcomputer is used for input reference voltage, and the PA0 end of described single-chip microcomputer, PA2 hold and PA5 end is corresponding exports the first dim signal, the second dim signal and the 3rd dim signal;
The tie point that the PA7 of described divider resistance R9 and described single-chip microcomputer holds is the input of described dimming controlling module, and the power input of described single-chip microcomputer, PA6 end, VSS end, PA0 end, PA2 end and PA5 correspond to the voltage input end of described dimming controlling module, calibration terminal, earth terminal, the first output, the second output and the 3rd output.
5. LED dimming driving circuit according to claim 1, is characterized in that, also comprises the reference voltage module be connected with the calibration terminal of described dimming controlling module, and described reference voltage module comprises voltage stabilizing chip U3, divider resistance R8 and filter capacitor C9;
The reference edge input reference voltage of described voltage stabilizing chip U3, the reference edge of described voltage stabilizing chip U3 is connected with the negative electrode of described voltage stabilizing chip U3, the plus earth of described voltage stabilizing chip U3, between the negative electrode that described filter capacitor C9 is parallel to described voltage stabilizing chip U3 and anode, one end of described divider resistance R8 is connected with the negative electrode of described voltage stabilizing chip U3, and the other end of described divider resistance R8 is connected with the calibration terminal of described dimming controlling module.
6. LED dimming driving circuit according to claim 1, is characterized in that, described one-level switch comprises PNP type triode Q1, NPN type triode Q4, divider resistance R2, divider resistance R5 and filter capacitor C3;
One end of described divider resistance R5 is connected with the first output of described dimming controlling module, and the other end of described divider resistance R5 is connected with the base stage of described NPN type triode Q4; The grounded emitter of described NPN type triode Q4, described divider resistance R2 is series between the collector electrode of described NPN type triode Q4 and the base stage of described PNP type triode Q1, the collector electrode of described PNP type triode Q1 is connected with the one-level input of described voltage regulating module, the emitter of described PNP type triode Q1 is connected with the first output of described power module, described filter capacitor C3 one end is connected with the emitter of described PNP type triode Q1, described filter capacitor C3 other end ground connection.
7. LED dimming driving circuit according to claim 1, is characterized in that, described secondary switch comprises PNP type triode Q2, NPN type triode Q5, divider resistance R3, divider resistance R6 and filter capacitor C4;
One end of described divider resistance R6 is connected with the second output of described dimming controlling module, and the other end of described divider resistance R6 is connected with the base stage of described NPN type triode Q5; The grounded emitter of described NPN type triode Q5, described divider resistance R3 is series between the collector electrode of described NPN type triode Q5 and the base stage of described PNP type triode Q2, the collector electrode of described PNP type triode Q2 is connected with the secondary input of described voltage regulating module, the emitter of described PNP type triode Q2 is connected with the first output of described power module, described filter capacitor C4 one end is connected with the emitter of described PNP type triode Q2, described filter capacitor C4 other end ground connection.
8. LED dimming driving circuit according to claim 1, is characterized in that, described three step switch comprises PNP type triode Q3, NPN type triode Q6, divider resistance R4, divider resistance R7 and filter capacitor C5;
One end of described divider resistance R7 is connected with the 3rd output of described dimming controlling module, and the other end of described divider resistance R7 is connected with the base stage of described NPN type triode Q6; The grounded emitter of described NPN type triode Q6, described divider resistance R4 is series between the collector electrode of described NPN type triode Q6 and the base stage of described PNP type triode Q3, the collector electrode of described PNP type triode Q3 is connected with three grades of inputs of described voltage regulating module, the emitter of described PNP type triode Q3 is connected with the first output of described power module, described filter capacitor C5 one end is connected with the emitter of described PNP type triode Q3, described filter capacitor C5 other end ground connection.
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| CN105657916B (en) * | 2016-04-05 | 2017-08-25 | 成都市曼苗科技有限公司 | One kind energy-conservation lamp module |
| CN107006094B (en) * | 2017-03-02 | 2019-03-19 | 深圳市豪恩智能物联股份有限公司 | LED lamp and LED luminance adjust circuit |
| CN112425709B (en) * | 2020-11-13 | 2023-07-21 | 南京苏曼等离子科技有限公司 | High-voltage electric field low-temperature plasma cold sterilization device |
| CN112437516B (en) * | 2020-12-08 | 2023-06-27 | 宁波恒达高智能科技股份有限公司 | Digital timing dimmer control circuit |
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