CN101815388B - Led lamp control circuit and led lamp - Google Patents
Led lamp control circuit and led lamp Download PDFInfo
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- CN101815388B CN101815388B CN201010186205.5A CN201010186205A CN101815388B CN 101815388 B CN101815388 B CN 101815388B CN 201010186205 A CN201010186205 A CN 201010186205A CN 101815388 B CN101815388 B CN 101815388B
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Abstract
The invention relates to an LED lamp control circuit and an LED lamp which are connected with an LED light source. The LED lamp control circuit comprises a power supply module, a BUCK circuit and a micro-control module, wherein the power supply module supplies power for the micro-control module and the BUCK circuit; the micro-control module generates a square wave signal according to the operating current of the LED light source; and the BUCK circuit generates a constant DC voltage so as to drive the LED light source to illuminate. In the invention, the BUCK circuit is used for generating the constant DC voltage and has the characteristics of wide input voltage range and large output constant current. Moreover, when the input voltage of the power supply module or the parameters of the LED light source change, the magnitude of the finally generated constant DC voltage can be adjusted by adjusting the parameters of components in the BUCK circuit. The invention has high flexibility and good compatibility.
Description
Technical field
The present invention relates to lighting technical field, more particularly, relate to a kind of LED lamp control circuit and LED light fixture.
Background technology
The advantages such as in prior art, that LED light source has is energy-efficient, the life-span is long, low pressure is controlled, therefore be widely used in various light fixtures.Existing LED lamp control circuit mainly adopts constant current chip to realize that constant current drives, and because the input voltage range of constant current chip is narrower, can not meet voltage input in a big way, and the output constant current scope of constant current chip is less.So, the LED lamp control circuit that a kind of input voltage range of active demand is wider and the output constant current scope is larger and LED light fixture.
Summary of the invention
The technical problem to be solved in the present invention is, the defect that while for the above-mentioned LED lamp control circuit employing constant current chip of prior art, realizing that constant current drives, input voltage range is narrower, the output constant current scope is less, provide a kind of LED lamp control circuit and LED light fixture that input voltage range is wider and the output constant current scope is larger that meet.
One of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED lamp control circuit, it is connected with LED light source, described LED lamp control circuit comprises supply module, BUCK circuit and micro control module, described supply module is BUCK circuit and micro control module power supply, described micro control module produces a square-wave signal according to the operating current of LED light source, described BUCK circuit produces a constant DC voltage according to described square-wave signal, with the driving LED light source luminescent.
In LED lamp control circuit of the present invention, described BUCK circuit comprises switch element, fly-wheel diode, energy storage inductor and storage capacitor, and described LED light source is connected to the two ends of storage capacitor;
When described square-wave signal is controlled described switch element conducting, described energy storage inductor, storage capacitor and supply module form the first closed-loop path to produce described constant DC voltage; When described square-wave signal is controlled described switch element cut-off, described energy storage inductor, storage capacitor and fly-wheel diode form the second closed-loop path to produce described constant DC voltage.
In LED lamp control circuit of the present invention, described BUCK circuit also comprises current sampling resistor, described current sampling resistor and the two ends that are connected to described storage capacitor after described LED light source is connected, described current sampling resistor produces a sampled signal, described micro control module is according to frequency and/or the duty ratio of the described square-wave signal of described sampled signal regulating and controlling, thereby the final described constant DC voltage produced of described BUCK circuit is regulated, driven with the constant current that realizes LED light source.
In LED lamp control circuit of the present invention, described switch element comprises a switching tube, described switching tube, energy storage inductor and storage capacitor are connected to after connecting successively between supply module positive output end and supply module negative output terminal, and described fly-wheel diode Opposite direction connection is between the input and supply module negative output terminal of energy storage inductor;
When described switching tube conducting, described energy storage inductor, storage capacitor and supply module form described the first closed-loop path; When described switching tube cut-off, described energy storage inductor, storage capacitor and fly-wheel diode form described the second closed-loop path.
In LED lamp control circuit of the present invention, described switch element comprises the first switching tube and second switch pipe, when the conducting of second switch pipe, the also conducting of the first switching tube, now described energy storage inductor, storage capacitor and supply module form described the first closed-loop path; When the second switch pipe ends, the first switching tube also ends, and now described energy storage inductor, storage capacitor and fly-wheel diode form described the second closed-loop path.
In LED lamp control circuit of the present invention, described BUCK circuit also comprises the first resistance, the second resistance and the 3rd resistance, the source electrode of the first switching tube is connected to the supply module positive output end, the grid of the first switching tube connects the collector electrode of second switch pipe, the emitting stage of second switch pipe is connected to the supply module negative output terminal, the first resistance is connected between the source electrode and grid of the first switching tube, the second resistance is connected between the base stage and emitting stage of second switch pipe, the base stage of second switch pipe connects a control end of described micro control module by the 3rd resistance, described control end is for exporting described square-wave signal, the drain electrode of the first switching tube is connected to the supply module negative output terminal by described energy storage inductor and storage capacitor successively, and the fly-wheel diode Opposite direction connection is between the drain electrode and supply module negative output terminal of the first switching tube.
In LED lamp control circuit of the present invention, described LED lamp control circuit also comprises the reference voltage base module, and described reference voltage base module provides internal reference voltage benchmark and/or external reference voltage benchmark for described micro control module;
Described LED lamp control circuit also comprises power management module, described power management module is connected between described supply module and micro control module, described power management module is sampled and is obtained a supply voltage sampled value the output voltage of described supply module, described micro control module compares described supply voltage sampled value and described reference voltage base, when described supply voltage sampled value is less than described reference voltage base, described micro control module output one is crossed and is put control signal, thereby controls described supply module and the disconnection of described micro control module.
In LED lamp control circuit of the present invention, the voltage that described power management module adopts voltage to adjust chip to be provided described supply module is changed adjusting, thereby be described micro control module power supply, the mistake of described micro control module output is put control signal and is quit work by controlling described voltage adjustment chip, thereby controls described supply module and the disconnection of described micro control module.
In LED lamp control circuit of the present invention, described LED lamp control circuit also comprises light-emitting mode selection module, described light-emitting mode selects module to be connected between described supply module and micro control module, and described light-emitting mode selects module to produce high light mode select signal and low light level mode select signal;
Described micro control module produces the first square-wave signal according to described high light mode select signal, produce the first constant DC voltage to control described BUCK circuit, thereby it is luminous with the high light pattern to control described LED light source;
Described micro control module produces the second square-wave signal according to described low light level mode select signal, produce the second constant DC voltage to control described BUCK circuit, thereby it is luminous with low light level pattern to control described LED light source.
Two of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED light fixture, comprise LED light source and coupled LED lamp control circuit, the LED lamp control circuit described in one of described LED lamp control circuit is technique scheme.
Implement LED lamp control circuit of the present invention and LED light fixture, have following beneficial effect: the operating current of micro control module sampling LED light source produces a square-wave signal, thereby control the BUCK circuit and produce a constant DC voltage, so that the luminous work of LED light source, the BUCK circuit has the advantages that input voltage range is wider, the output constant current scope is larger; And, when the parameter of the input voltage of supply module or LED light source changes, the size that can regulate the constant DC voltage of final generation by the parameter of regulating components and parts in the BUCK circuit, flexibility is high, compatible good.
In addition, adopt light-emitting mode to select module can realize the switching of high light light-emitting mode and the low light level light-emitting mode of LED light source; Adopt power management module can realize the Cross prevention of supply module, and can adjusting chip by voltage, to produce a suitable voltage be the micro control module power supply.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the theory diagram of LED lamp control circuit the first embodiment of the present invention;
Fig. 2 is the theory diagram of LED lamp control circuit the second embodiment of the present invention;
Fig. 3 is the theory diagram of LED lamp control circuit the 3rd embodiment of the present invention;
Fig. 4 is the circuit diagram of BUCK circuit the first embodiment in LED lamp control circuit of the present invention;
Fig. 5 is the circuit diagram of BUCK circuit the second embodiment in LED lamp control circuit of the present invention;
Fig. 6 is the circuit diagram of LED lamp control circuit the first embodiment shown in Fig. 3 of the present invention;
Fig. 7 is the circuit diagram of LED lamp control circuit the second embodiment shown in Fig. 3 of the present invention;
Fig. 8 is the circuit diagram of LED lamp control circuit the 3rd embodiment shown in Fig. 3 of the present invention.
Embodiment
As shown in Figure 1, be the theory diagram of LED lamp control circuit the first embodiment of the present invention.LED lamp control circuit of the present invention is connected with LED light source, it comprises supply module 1, BUCK circuit 2 and micro control module 3, supply module 1 is connected with micro control module 3 with BUCK circuit 2 respectively, and BUCK circuit 2 is connected with micro control module 3, supply module 1 is BUCK circuit 2 and micro control module 3 power supplies, micro control module 3 produces a square-wave signal according to the operating current of LED light source, and BUCK circuit 2 produces a constant DC voltage according to described square-wave signal, with the driving LED light source luminescent.In the present invention, adopt BUCK circuit 2 to produce described constant DC voltage, have the advantages that input voltage range is wider and the output constant current scope is larger, and, when the parameter of the input voltage of supply module 1 or LED light source changes, parameter that can be by regulating components and parts in BUCK circuit 2 is with the size of the constant DC voltage of regulating final generation, and flexibility is high, compatible good.
As shown in Figure 2, be the theory diagram of LED lamp control circuit the second embodiment of the present invention.With the difference of the first embodiment shown in Fig. 1, be: on the basis of the first embodiment, this LED lamp control circuit also comprises reference voltage base module 4 and power management module 5.
Wherein, reference voltage base module 4 is connected with micro control module 3, for micro control module 3 provides internal reference voltage benchmark and/or external reference voltage benchmark.Power management module 5 is connected between supply module 1 and micro control module 3, the output voltage of 5 pairs of supply modules 1 of power management module is sampled and is obtained a supply voltage sampled value, micro control module 3 compares described supply voltage sampled value and described reference voltage base, when described supply voltage sampled value is less than described reference voltage base, micro control module 3 outputs one are crossed and are put control signal, disconnect with micro control module 3 thereby control supply module 1, put to prevent that power supply from crossing.
Further, in LED lamp control circuit of the present invention, when the input voltage of supply module 1 is higher can not be directly micro control module 3 power supply the time, power management module 5 can adopt the voltage that power management chip provides supply module 1 to carry out the step-down conversion, thereby be that micro control module 3 is powered.
As shown in Figure 3, be the theory diagram of LED lamp control circuit the 3rd embodiment of the present invention.With the difference of the second embodiment shown in Fig. 2, be: on the basis of the second embodiment, this LED lamp control circuit also comprises light-emitting mode selection module 6, light-emitting mode selects module 6 to be connected between supply module 1 and micro control module 3, when the user triggers light-emitting mode selection module 6, light-emitting mode selects module 6 can produce high light mode select signal and low light level mode select signal.
As shown in Figure 4, be the circuit diagram of BUCK circuit the first embodiment in LED lamp control circuit of the present invention.In this first embodiment, switch element in this BUCK circuit adopts a switching tube to realize, , this BUCK circuit comprises switching tube Q1, sustained diode 1, energy storage inductor L1, storage capacitor C1 and the first resistance R 1, wherein, the source electrode of switching tube Q1 is connected to the supply module positive output end, the grid of switching tube Q1 connects a control end of micro control module, this control end is for exporting square-wave signal, the drain electrode of switching tube Q1 is successively by being connected to the supply module negative output terminal after energy storage inductor L1 and storage capacitor C1, the negative pole of sustained diode 1 is connected to the drain electrode of switching tube Q1, the positive pole of sustained diode 1 is connected to the supply module negative output terminal, the first resistance R 1 is connected between the grid and source electrode of switching tube Q1, LED light source is connected to the two ends of storage capacitor C1.
When switching tube Q1 conducting, thereby forming the first closed-loop path, energy storage inductor L1, storage capacitor C1 and supply module 1 make the luminous work of LED light source to produce described constant DC voltage; When switching tube Q1 ends, thereby forming the second closed-loop path, energy storage inductor L1, storage capacitor C1 and sustained diode 1 make the luminous work of LED light source to produce described constant DC voltage.
Further, this BUCK circuit also comprises current sampling resistor Rs, current sampling resistor Rs and the two ends that are connected to storage capacitor C1 after LED light source is connected, produce a sampled signal on the node of current sampling resistor Rs and LED light source, micro control module 3 is according to duty ratio and/or the frequency of described sampled signal regulating and controlling square-wave signal, thereby the constant DC voltage that described BUCK circuit is finally produced is regulated.
In the present embodiment, current sampling resistor Rs preferably is connected to supply module 1 negative output terminal, so that described sampled signal is less, is convenient to comparison, and can improve relatively precision.
As shown in Figure 5, be the circuit diagram of BUCK circuit the second embodiment in LED lamp control circuit of the present invention.With the difference of the first embodiment shown in Fig. 4, be: the switch element in this BUCK circuit adopts two switching tubes to realize,, this BUCK circuit comprises the first switching tube Q1, second switch pipe Q2, sustained diode 1, energy storage inductor L1 and storage capacitor C1, wherein, when second switch pipe Q2 conducting, the first also conducting of switching tube Q1, thus now energy storage inductor L1, storage capacitor C1 and supply module 1 forms the first closed-loop path and makes the luminous work of LED light source to produce described constant DC voltage; When second switch pipe Q2 ends, the first switching tube Q1 also ends, thereby now energy storage inductor L1, storage capacitor C1 and sustained diode 1 forms the second closed-loop path and make the luminous work of LED light source to produce described constant DC voltage.
Particular circuit configurations is as follows: this BUCK circuit comprises the first switching tube Q1, second switch pipe Q2, sustained diode 1, energy storage inductor L1, storage capacitor C1, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3 and current sampling resistor Rs, the source electrode of the first switching tube Q1 is connected to the supply module positive output end, the grid of the first switching tube Q1 connects the collector electrode of second switch pipe Q2, the emitting stage of second switch pipe Q2 is connected to the supply module negative output terminal, the drain electrode of the first switching tube Q1 is successively by energy storage inductor L1, be connected to the supply module negative output terminal after storage capacitor C1, the negative pole of sustained diode 1 is connected to the drain electrode of the first switching tube Q1, the positive pole of sustained diode 1 is connected to the supply module negative output terminal, the first resistance R 1 is connected between the source electrode and grid of the first switching tube Q1, the second resistance R 2 is connected between the base stage and emitting stage of second switch pipe Q2, the base stage of second switch pipe Q2 connects a control end of micro control module by the 3rd resistance R 3, this control end is for exporting square-wave signal, current sampling resistor Rs and the two ends that are connected to storage capacitor C1 after LED light source is connected, produce sampled signal on the node of current sampling resistor Rs and LED light source, micro control module 3 is according to the described square-wave signal of described sampled signal regulating and controlling, thereby the constant DC voltage that described BUCK circuit is finally produced is regulated.
In the present embodiment, current sampling resistor Rs also preferably is connected to supply module 1 negative output terminal, so that described sampled signal is less, is convenient to comparison, and can improve relatively precision.
As shown in Figure 6, be the circuit diagram of LED lamp control circuit the first embodiment shown in Fig. 3 of the present invention.In this first embodiment, supply module 1 adopts battery, and described battery is by Wiring port P1 access, and this battery can provide the low voltage input, and as between 3.6V to 4.2V etc., further, supply module 1 also can be included as the charging device that battery provides charging.
The 7th I/O mouth that the node of current sampling resistor Rs and LED light source is connected to single-chip microcomputer U2 is pin 7, and the node of current sampling resistor Rs and LED light source produces sampled signal FB, micro control module 3 will be duty ratio and/or the frequency of the square-wave signal PWM of pin 5 outputs according to the 5th I/O mouth of sampled signal FB regulating and controlling single-chip microcomputer U2, thereby the final constant DC voltage produced of BUCK circuit 2 is regulated, driven to realize constant current.
In the present embodiment, reference voltage base module 4 adopts reference power supply chip U1 that the external reference voltage benchmark is provided, the preferred model of reference power supply chip U1 is NCP100SNT1G, the pin 1 of reference power supply chip U1 is unsettled, the first anode of reference power supply chip U1 is that pin 2 is that pin 5 is connected and ground connection with second plate, and the first anode of reference power supply chip U1 is that the reference edge that pin 2 is connected to reference power supply chip U1 by the 5th resistance R 5 is pin 4.The reference edge of reference power supply chip U1 is that the negative electrode that pin 4 is connected to reference power supply chip U1 by the 6th resistance R 6 is pin 3, the negative electrode of reference power supply chip U1 is that the 2nd I/O mouth that pin 3 is connected to single-chip microcomputer U2 is pin 2, the negative electrode of reference power supply chip U1 is that the I/O mouth that pin 3 also is connected to single-chip microcomputer U2 by the 4th resistance R 4 is pin 1, and the negative electrode of reference power supply chip U1 is that pin 3 is connected to the battery positive output end by the 4th resistance R 4 simultaneously.
Light-emitting mode selects module 6 to comprise switch S 1 and the 9th resistance R 9, the battery positive output end is successively by switch S 1 and the 9th resistance R 9 ground connection, the 6th I/O mouth that the node of switch S 1 and the 9th resistance R 9 is connected to single-chip microcomputer U2 is pin 6, and the node of switch S 1 and the 9th resistance R 9 produces high light mode select signal and low light level mode select signal, be signal Switch-in, when switch S 1 conducting, signal Switch-in is high level, when switch S 1 disconnects, signal Switch-in is low level.Suppose: during switch S 1 conducting herein, signal Switch-in is high level, this high level is the high light mode select signal, the 5th I/O mouth of single-chip microcomputer U2 is that pin 5 produces the first square-wave signal PWM according to described high light mode select signal, produce the first constant DC voltage to control the BUCK2 circuit, thereby it is luminous with the high light pattern to control LED light source; When switch S 1 disconnects, signal Switch-in is low level, this low level is low light level mode select signal, the 5th I/O mouth of single-chip microcomputer U2 is that pin 5 produces the second square-wave signal PWM according to described low light level mode select signal, produce the second constant DC voltage to control BUCK circuit 2, thereby it is luminous with low light level pattern to control LED light source.
As shown in Figure 7, be the circuit diagram of LED lamp control circuit the second embodiment shown in Fig. 3 of the present invention.In this second embodiment, supply module 1 also adopts battery, and battery is by Wiring port P1 access, and this battery can provide the high voltage input, and as between 10.8V to 12.6V etc., further, supply module 1 also can be included as the charging device that battery provides charging.
The 7th I/O mouth that the node of current sampling resistor Rs and LED light source is connected to single-chip microcomputer U2 is pin 7, and the node of current sampling resistor Rs and LED light source produces sampled signal FB, micro control module 3 will be duty ratio and/or the frequency of the square-wave signal PWM of pin 5 outputs according to the 5th I/O mouth of sampled signal FB regulating and controlling single-chip microcomputer U2, thereby the final constant DC voltage produced of BUCK circuit 2 is regulated, driven to realize constant current.
In the present embodiment, reference voltage base module 4 adopts reference power supply chip U1 that the external reference voltage benchmark is provided, the preferred model of reference power supply chip U1 is NCP100SNT1G, the pin 1 of reference power supply chip U1 is unsettled, the first anode of reference power supply chip U1 is that pin 2 is that pin 5 is connected and ground connection with second plate, and the first anode of reference power supply chip U1 is that the reference edge that pin 2 is connected to reference power supply chip U1 by the 5th resistance R 5 is pin 4.The reference edge of reference power supply chip U1 is that the negative electrode that pin 4 is connected to reference power supply chip U1 by the 6th resistance R 6 is pin 3, the negative electrode of reference power supply chip U1 is that the 2nd I/O mouth that pin 3 is connected to single-chip microcomputer U2 is pin 2, and the negative electrode of reference power supply chip U1 is that the I/O mouth that pin 3 also is connected to single-chip microcomputer U2 by the 4th resistance R 4 is pin 1, the negative electrode of reference power supply chip U1 is that the feeder ear that pin 3 is connected to single-chip microcomputer U2 by the 4th resistance R 4 is pin 8 simultaneously.
Light-emitting mode selects module 6 to comprise switch S 1, the 11 resistance R 11 and the 12 resistance R 12, the battery positive output end is successively by switch S 1, the 11 resistance R 11 and the 12 resistance R 12 ground connection, the 6th I/O mouth that the node of the 11 resistance R 11 and the 12 resistance R 12 is connected to single-chip microcomputer U2 is pin 6, and the node of the 11 resistance R 11 and the 12 resistance R 12 is for generation of described high light mode select signal and low light level mode select signal, be signal Switch-in, when switch S 1 conducting, signal Switch-in is high level, when switch S 1 disconnects, signal Switch-in is low level.Also suppose: during switch S 1 conducting herein, signal Switch-in is high level, this high level is the high light mode select signal, the 5th I/O mouth of single-chip microcomputer U2 is that pin 5 produces the first square-wave signal PWM according to described high light mode select signal, produce the first constant DC voltage to control BUCK circuit 2, thereby it is luminous with the high light pattern to control LED light source; When switch S 1 disconnects, signal Switch-in is low level, this low level is low light level mode select signal, the 5th I/O mouth of single-chip microcomputer U2 is that pin 5 produces the second square-wave signal PWM according to described low light level mode select signal, produce the second constant DC voltage to control BUCK circuit 2, thereby it is luminous with low light level pattern to control LED light source.
Power supply adjustment member 52 comprises voltage adjustment chip U3, the 9th resistance R 9, the tenth resistance R 10 and the second diode D2, the preferred model that voltage is adjusted chip U3 is LP2980IM5-3.3, the input that voltage is adjusted chip U3 is that pin 1 is connected to the battery positive output end, the output that voltage is adjusted chip U3 is that the feeder ear that pin 5 is connected to single-chip microcomputer U2 is pin 8, the output that voltage is adjusted chip U3 is the voltage of pin 5 output 3.3V, and the voltage of this 3.3V is single-chip microcomputer U2 power supply.The pin 4 of voltage adjustment chip U3 is unsettled, voltage is adjusted pin 2 ground connection of chip U3, the Enable Pin that voltage is adjusted chip U3 is that the I/O mouth that pin 3 is connected to single-chip microcomputer U2 is pin 1, and the Enable Pin that voltage is adjusted chip U3 is that pin 3 is by the tenth resistance R 10 ground connection, in addition, the Enable Pin that the second diode D2 that switch S 1 is connected by forward successively with the node of the 11 resistance R 11 and the 9th resistance R 9 are connected to voltage adjustment chip U3 is pin 3.
In single-chip microcomputer U2; by the 3rd I/O mouth, be that supply voltage sampled value Batt Detect and the 2nd I/O mouth on pin 3 is that pin 2 reference voltage base Vref compare; when supply voltage sampled value BattDetect is less than reference voltage base Vref; the I/O mouth of single-chip microcomputer U2 is that control signal V-en is put in pin 1 output one excessively; thereby controlling voltage adjustment chip U3 quits work; do not produce output so that voltage is adjusted chip U3, thereby realize the Cross prevention function of battery.
As shown in Figure 8, be the circuit diagram of LED lamp control circuit the 3rd embodiment shown in Fig. 3 of the present invention.In this 3rd embodiment, supply module 1 also adopts battery, and battery is by Wiring port P1 access, and this battery can provide the high voltage input, and as between 14.4V to 16.8V etc., further, supply module 1 also can be included as the charging device that battery provides charging.
BUCK circuit 2 is identical with the BUCK circuit in the LED lamp control circuit shown in the BUCK circuit shown in Fig. 5 and Fig. 7.This BUCK circuit 2 comprises the first switching tube Q1, second switch pipe Q2, sustained diode 1, energy storage inductor L1, storage capacitor C1, the first resistance R 1 and current sampling resistor Rs, wherein, the grid of the first switching tube Q1 connects the collector electrode of second switch pipe Q2, the emitting stage of second switch pipe Q2 is connected to the battery negative output terminal, the drain electrode of the first switching tube Q1 is successively by energy storage inductor L1, be connected to the battery negative output terminal after storage capacitor C1, the negative pole of sustained diode 1 is connected to the drain electrode of the first switching tube, the positive pole of sustained diode 1 is connected to the battery negative output terminal, the first resistance R 1 is connected between the source electrode and grid of the first switching tube Q1, the second resistance R 2 is connected between the base stage and emitting stage of second switch pipe Q2, the 5th I/O mouth that the base stage of second switch pipe Q2 connects single-chip microcomputer U2 by the 3rd resistance R 3 is pin 5, the 5th I/O mouth is that pin 5 is for exporting square-wave signal PWM.Be connected to the two ends of storage capacitor C1 after LED light source and current sampling resistor Rs series connection, when square-wave signal PWM control switch pipe Q1 conducting, thereby forming described the first closed-loop path, energy storage inductor L1, storage capacitor C1 and battery make the luminous work of LED light source to produce described constant DC voltage; Thereby energy storage inductor L1, storage capacitor C1 and sustained diode 1 form described the second closed-loop path and make the luminous work of LED light source to produce described constant DC voltage when square-wave signal PWM control switch pipe Q1 ends.
The 7th I/O mouth that the node of current sampling resistor Rs and LED light source is connected to single-chip microcomputer U2 is pin 7, and the node of current sampling resistor Rs and LED light source produces sampled signal FB, micro control module 3 will be duty ratio and/or the frequency of the square-wave signal PWM of pin 5 outputs according to the 5th I/O mouth of sampled signal FB regulating and controlling single-chip microcomputer U2, thereby the final constant DC voltage produced of BUCK circuit 2 is regulated, driven to realize constant current.
In the present embodiment, in the present embodiment, reference voltage base module 4 also adopts reference power supply chip U1 that the external reference voltage benchmark is provided, the preferred model of reference power supply chip U1 is NCP100SNT1G, the pin 1 of reference power supply chip U1 is unsettled, the first anode of reference power supply chip U1 is that pin 2 is that pin 5 is connected and ground connection with second plate, and the first anode of reference power supply chip U1 is that the reference edge that pin 2 is connected to reference power supply chip U1 by the 5th resistance R 5 is pin 4.The reference edge of reference power supply chip U1 is that the negative electrode that pin 4 is connected to reference power supply chip U1 by the 6th resistance R 6 is pin 3, the negative electrode of reference power supply chip U1 is that the 2nd I/O mouth that pin 3 is connected to single-chip microcomputer U2 is pin 2, and the negative electrode of reference power supply chip U1 is that the I/O mouth that pin 3 also is connected to single-chip microcomputer U2 by the 4th resistance R 4 is pin 1, the negative electrode of reference power supply chip U1 is that the feeder ear that pin 3 is connected to single-chip microcomputer U2 by the 4th resistance R 4 is pin 8 simultaneously.
Light-emitting mode selects module 6 to comprise switch S 1, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the 14 resistance R 14 and the second diode D2, the battery positive output end is successively by the 11 resistance R 11 and the 12 resistance R 12 ground connection, the battery positive output end is also successively by the 13 resistance R 13 and the 14 resistance R 14 ground connection simultaneously, the 6th I/O mouth that the node of the 11 resistance R 11 and the 12 resistance R 12 is connected to single-chip microcomputer U2 is pin 6, the node of the 11 resistance R 11 and the 12 resistance R 12 is by switch S 1 ground connection simultaneously, the positive pole of the second diode D2 is connected to the node of the 13 resistance R 13 and the 14 resistance R 14, the negative pole of the second diode D2 is connected to the node of the 11 resistance R 11 and the 12 resistance R 12, the node of the 11 resistance R 11 and the 12 resistance R 12 is for generation of described high light mode select signal and low light level mode select signal, be signal Switch-in, when switch S 1 disconnects, signal Switch-in is high level, when switch S 1 conducting, signal Switch-in is low level.Suppose: when switch S 1 disconnects herein, signal Switch-in is high level, this high level is the high light mode select signal, the 5th I/O mouth of single-chip microcomputer U2 is that pin 5 produces the first square-wave signal PWM according to described high light mode select signal, produce the first constant DC voltage to control BUCK circuit 2, thereby it is luminous with the high light pattern to control LED light source; During switch S 1 conducting, signal Switch-in is low level, this low level is low light level mode select signal, the 5th I/O mouth of single-chip microcomputer U2 is that pin 5 produces the second square-wave signal PWM according to described low light level mode select signal, produce the second constant DC voltage to control BUCK circuit 2, thereby it is luminous with low light level pattern to control LED light source.
Power management module 5 mainly is comprised of two parts: supply voltage sampling section 51 and power supply adjustment member 52.Supply voltage sampling section 51 comprises the 7th resistance R 7 and the 8th resistance R 8, the battery positive output end is successively by the 8th resistance R 8 and the 7th resistance R 7 ground connection, the 3rd I/O mouth that the node of the 8th resistance R 8 and the 7th resistance R 7 is connected to single-chip microcomputer U2 is pin 3, and the described supply voltage sampled value Batt Detect of output on the node of the 8th resistance R 8 and the 7th resistance R 7.Power supply adjustment member 52 comprises voltage adjustment chip U3, the 9th resistance R 9 and the tenth resistance R 10, the preferred model that voltage is adjusted chip U3 is LM2931CM, the input that voltage is adjusted chip U3 is that pin 8 is connected to the battery positive output end, the output that voltage is adjusted chip U3 is the voltage of pin 1 output 3.3V, the voltage of this 3.3V is single-chip microcomputer U2 power supply, and the output that voltage is adjusted chip U3 is that pin 1 is successively by the 9th resistance R 9 and the tenth resistance R 10 ground connection, the node of the 9th resistance R 9 and the tenth resistance R 10 is connected to the pin 4 that voltage is adjusted chip U3, voltage is adjusted the pin 2 of chip U3, pin 3, pin 6 and pin 7 ground connection, the Enable Pin that voltage is adjusted chip U3 is that the I/O mouth that pin 5 is connected to single-chip microcomputer U2 is pin 1, and the Enable Pin that voltage is adjusted chip U3 is the node that pin 5 is connected to the 13 resistance R 13 and the 14 resistance R 14.
In single-chip microcomputer U2; by the 3rd I/O mouth, be that supply voltage sampled value Batt Detect and the 2nd I/O mouth on pin 3 is that pin 2 reference voltage base Vref compare; when supply voltage sampled value BattDetect is less than reference voltage base Vref; the I/O mouth of single-chip microcomputer U2 is that control signal V-en is put in pin 1 output one excessively; thereby control voltage adjustment chip U3 and do not produce output, thereby realize the Cross prevention function of battery.
In the present invention, the first switching tube Q1 most preferably uses mos field effect transistor, and conduction voltage drop is less, thereby the power consumed is less.In addition, sustained diode 1 is selected Schottky diode most, and conducting cut-off reaction is very fast, and anti-phase withstand voltage is larger.
In the present invention, the generation of high light mode select signal and low light level mode select signal in light-emitting mode selection module 6, not only be confined to realize with the two states of switch S 1 conducting or disconnection, also can realize by the pulse of the continuous conducting of switch S 1, generation while disconnecting.
In the present invention, this LED lamp control circuit also can comprise display module, for the electric weight to supply module 1 battery, is indicated.
To sum up, compared with prior art, in LED lamp control circuit of the present invention, the operating current of micro control module 3 sampling LED light sources produces a square-wave signal, thereby control BUCK circuit 2 and produce a constant DC voltage, so that the luminous work of LED light source, described BUCK circuit 2 has the advantages that input voltage range is wider, the output constant current scope is larger; And, when the parameter of the input voltage of supply module 1 or LED light source changes, can regulate the constant DC voltage of final generation by the parameter of regulating energy storage inductor, storage capacitor in BUCK circuit 2, flexibility is high, compatible good.
Further, adopt light-emitting mode to select module 6 can realize the switching of high light light-emitting mode and the low light level light-emitting mode of LED light source; Adopt power management module 5 can realize the Cross prevention of supply module, and adjusting chip by voltage, to produce a suitable voltage be that micro control module is powered.
The invention still further relates to a kind of LED light fixture, it comprises LED lamp control circuit and LED light source, and described LED lamp control circuit comprises supply module 1, BUCK circuit 2, micro control module 3, reference voltage base module 4, power management module 5 and light-emitting mode selection module 6.
Wherein, supply module 1 is connected with micro control module 3 with BUCK circuit 2 respectively, and BUCK circuit 2 is connected with micro control module 3, supply module 1 is BUCK circuit 2 and micro control module 3 power supplies, micro control module 3 produces a square-wave signal according to the operating current of LED light source, BUCK circuit 2 produces a constant DC voltage according to described square-wave signal, with the driving LED light source luminescent.In the present invention, the operating current of micro control module 3 sampling LED light sources produces a square-wave signal, thereby control BUCK circuit 2 and produce a constant DC voltage, so that the luminous work of LED light source, described BUCK circuit 2 has the advantages that input voltage range is wider and the output constant current scope is larger, and, when the parameter of the input voltage of supply module 1 or LED light source changes, can regulate by the parameter of regulating components and parts in BUCK circuit 2 constant DC voltage of final generation, flexibility is high, compatible good.
Further, described LED lamp control circuit also comprises light-emitting mode selection module 6, it is connected between supply module 1 and micro control module 3, and when the user triggers light-emitting mode selection module 6, light-emitting mode selects module 6 can produce high light mode select signal and low light level mode select signal.Micro control module 3 produces the first square-wave signal PWM according to described high light mode select signal, produces the first constant DC voltage thereby control BUCK circuit 2, so that LED light source is luminous with the high light pattern; Micro control module 3 produces the second square-wave signal PWM according to described low light level mode select signal, produces the second constant DC voltage thereby control BUCK circuit 2, so that LED light source is luminous with low light level pattern.Visible, select module 6 by the manual activation light-emitting mode, can realize the switching of LED light source light-emitting mode.
Further, described LED lamp control circuit also comprises reference voltage base module 4, and it is connected with micro control module 3, for micro control module 3 provides internal reference voltage benchmark and/or external reference voltage benchmark.
Further, described LED lamp control circuit also comprises power management module 5, it is connected between supply module 1 and micro control module 3, the output voltage of 5 pairs of supply modules 1 of power management module is sampled and is obtained a supply voltage sampled value, micro control module 3 compares described supply voltage sampled value and described reference voltage base, when described supply voltage sampled value is less than described reference voltage base, micro control module 3 outputs one are crossed and are put control signal, disconnect with micro control module 3 thereby control supply module 1, put to prevent that power supply from crossing.When the input voltage of supply module 1 is higher can not be directly micro control module 3 power supply the time, power management module 5 can adopt the voltage that power management chip provides supply module 1 to carry out the step-down conversion, thereby be that micro control module 3 is powered.
The embodiment of this LED lamp control circuit will repeat no more herein.
The foregoing is only embodiments of the invention, not in order to limit the present invention, all any modifications of doing in the spirit and principles in the present invention, be equal to and replace or improvement etc., all should be included in protection scope of the present invention.
Claims (9)
1. a LED lamp control circuit, with LED light source, be connected, described LED lamp control circuit comprises supply module and micro control module, described supply module is the micro control module power supply, it is characterized in that, also comprises a BUCK circuit, described supply module is described BUCK circuit supply, described micro control module produces a square-wave signal according to the operating current of LED light source, and described BUCK circuit produces a constant DC voltage according to described square-wave signal, with the driving LED light source luminescent;
Described LED lamp control circuit also comprises light-emitting mode selection module, described light-emitting mode selects module to be connected between described supply module and micro control module, described light-emitting mode selects module to comprise switch S 1 and the 9th resistance, described supply module is successively through switch S 1 and the 9th grounding through resistance, node between switch S 1 and the 9th resistance is connected with described micro control module, described light-emitting mode selects module when described switch S 1 conducting, node voltage between switch S 1 and the 9th resistance is high level, described micro control module receives high level and produces the high light mode select signal, and when described switch S 1 disconnects, node voltage between switch S 1 and the 9th resistance is low level, described micro control module receives low level and produces low light level mode select signal, perhaps described light-emitting mode selects module to comprise switch S 1, the 11 resistance and the 12 resistance, described supply module is successively through switch S 1, the 11 resistance and the 12 grounding through resistance, node between described the 11 resistance and the 12 resistance is connected with described micro control module, described light-emitting mode selects module when described switch S 1 conducting, node voltage between the 11 resistance and the 12 resistance is high level, described micro control module receives high level and produces the high light mode select signal, and when described switch S 1 disconnects, node voltage between the 11 resistance and the 12 resistance is low level, described micro control module receives low level and produces low light level mode select signal, perhaps described light-emitting mode selects module to comprise switch S 1, the 11 resistance, the 12 resistance, the 13 resistance, the 14 resistance and the second diode, described supply module is successively through the 11 resistance and the 12 grounding through resistance, described supply module is successively through the 13 resistance and the 14 grounding through resistance, the negative pole of the second diode is connected with the node between the 11 resistance and the 12 resistance, the positive pole of the second diode is connected with the node between the 13 resistance and the 14 resistance, one end of switch S 1 respectively with the 11 resistance and the 12 resistance between node with described micro control module, be connected, the other end ground connection of switch S 1, described light-emitting mode selects module when described switch S 1 disconnects, node voltage between the 11 resistance and the 12 resistance is high level, described micro control module receives high level and produces the high light mode select signal, and when described switch S 1 conducting, node voltage between the 11 resistance and the 12 resistance is low level, described micro control module receives low level and produces low light level mode select signal,
Described micro control module produces the first square-wave signal according to described high light mode select signal, produce the first constant DC voltage to control described BUCK circuit, thereby it is luminous with the high light pattern to control described LED light source;
Described micro control module produces the second square-wave signal according to described low light level mode select signal, produce the second constant DC voltage to control described BUCK circuit, thereby it is luminous with low light level pattern to control described LED light source;
Described micro control module has feeder ear pin and earth terminal pin, between described feeder ear pin and earth terminal pin, is connected with filter capacitor C2.
2. LED lamp control circuit according to claim 1, is characterized in that, described BUCK circuit comprises switch element, fly-wheel diode, energy storage inductor and storage capacitor, and described LED light source is connected to the two ends of storage capacitor;
When described square-wave signal is controlled described switch element conducting, described energy storage inductor, storage capacitor and supply module form the first closed-loop path to produce described constant DC voltage; When described square-wave signal is controlled described switch element cut-off, described energy storage inductor, storage capacitor and fly-wheel diode form the second closed-loop path to produce described constant DC voltage.
3. LED lamp control circuit according to claim 2, it is characterized in that, described BUCK circuit also comprises current sampling resistor, described current sampling resistor and the two ends that are connected to described storage capacitor after described LED light source is connected, described current sampling resistor produces a sampled signal, described micro control module is according to frequency and/or the duty ratio of the described square-wave signal of described sampled signal regulating and controlling, thereby the final described constant DC voltage produced of described BUCK circuit is regulated, driven with the constant current that realizes LED light source.
4. LED lamp control circuit according to claim 2, it is characterized in that, described switch element comprises a switching tube, described switching tube, energy storage inductor and storage capacitor are connected to after connecting successively between supply module positive output end and supply module negative output terminal, and described fly-wheel diode Opposite direction connection is between the input and supply module negative output terminal of energy storage inductor;
When described switching tube conducting, described energy storage inductor, storage capacitor and supply module form described the first closed-loop path; When described switching tube cut-off, described energy storage inductor, storage capacitor and fly-wheel diode form described the second closed-loop path.
5. LED lamp control circuit according to claim 2, it is characterized in that, described switch element comprises the first switching tube and second switch pipe, when the conducting of second switch pipe, the also conducting of the first switching tube, now described energy storage inductor, storage capacitor and supply module form described the first closed-loop path; When the second switch pipe ends, the first switching tube also ends, and now described energy storage inductor, storage capacitor and fly-wheel diode form described the second closed-loop path.
6. LED lamp control circuit according to claim 5, it is characterized in that, described BUCK circuit also comprises the first resistance, the second resistance and the 3rd resistance, the source electrode of the first switching tube is connected to the supply module positive output end, the grid of the first switching tube connects the collector electrode of second switch pipe, the emitting stage of second switch pipe is connected to the supply module negative output terminal, the first resistance is connected between the source electrode and grid of the first switching tube, the second resistance is connected between the base stage and emitting stage of second switch pipe, the base stage of second switch pipe connects a control end of described micro control module by the 3rd resistance, described control end is for exporting described square-wave signal, the drain electrode of the first switching tube is connected to the supply module negative output terminal by described energy storage inductor and storage capacitor successively, and the fly-wheel diode Opposite direction connection is between the drain electrode and supply module negative output terminal of the first switching tube.
7. LED lamp control circuit according to claim 1, is characterized in that,
Described LED lamp control circuit also comprises the reference voltage base module, and described reference voltage base module provides internal reference voltage benchmark and/or external reference voltage benchmark for described micro control module;
Described LED lamp control circuit also comprises power management module, described power management module is connected between described supply module and micro control module, described power management module is sampled and is obtained a supply voltage sampled value the output voltage of described supply module, described micro control module compares described supply voltage sampled value and described reference voltage base, when described supply voltage sampled value is less than described reference voltage base, described micro control module output one is crossed and is put control signal, thereby controls described supply module and the disconnection of described micro control module.
8. LED lamp control circuit according to claim 7, it is characterized in that, the voltage that described power management module adopts voltage to adjust chip to be provided described supply module is changed adjusting, thereby be described micro control module power supply, the mistake of described micro control module output is put control signal and is quit work by controlling described voltage adjustment chip, thereby controls described supply module and the disconnection of described micro control module.
9. a LED light fixture, comprise LED light source and coupled LED lamp control circuit, it is characterized in that, described LED lamp control circuit is the described LED lamp control circuit of any one in claim 1 to 8.
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| CN102711310A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | Light-emitting diode (LED) drive circuit and lamp |
| CN102711308A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | LED (Light Emitting Diode) drive circuit and lamp |
| CN102890243B (en) * | 2011-07-20 | 2016-08-24 | 海洋王照明科技股份有限公司 | A kind of battery electric quantity measuring circuit, measurement apparatus and battery meter |
| CN102595710B (en) * | 2012-01-16 | 2015-01-21 | 惠州Tcl移动通信有限公司 | Drive circuit of keyboard lamp of mobile terminal |
| CN103428936B (en) * | 2012-05-16 | 2017-08-15 | 海洋王照明科技股份有限公司 | LED light adjusting circuits |
| CN102740564B (en) * | 2012-06-28 | 2015-04-22 | 上海新进半导体制造有限公司 | Light emitting diode (LED) driving circuit and control method of LED |
| CN104812132B (en) * | 2015-04-14 | 2017-08-29 | 常州工程职业技术学院 | The design method and its device of photovoltaic LED array analog light source |
| CN105338711A (en) * | 2015-11-30 | 2016-02-17 | 广东酷柏光电股份有限公司 | LED lamp with variable brightness |
| CN106354075B (en) * | 2016-11-25 | 2020-01-21 | 北京意同创科技有限公司 | Remote controller control circuit with backlight screen |
| CN110418071A (en) * | 2019-08-28 | 2019-11-05 | 北京欧比邻科技有限公司 | Optical alignment camera light filling circuit |
| CN112669767B (en) * | 2020-12-28 | 2023-05-30 | 深圳创维－Rgb电子有限公司 | Mini LED driving system and driving method thereof |
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| CN101707826B (en) * | 2009-03-19 | 2012-12-19 | 海洋王照明科技股份有限公司 | LED constant current driving circuit |
| CN101707827B (en) * | 2009-05-07 | 2012-12-26 | 海洋王照明科技股份有限公司 | Battery power supply control method of LED lamp and system |
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