CN101815386A - LED lamp and control circuit thereof - Google Patents

LED lamp and control circuit thereof Download PDF

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Publication number
CN101815386A
CN101815386A CN201010160698A CN201010160698A CN101815386A CN 101815386 A CN101815386 A CN 101815386A CN 201010160698 A CN201010160698 A CN 201010160698A CN 201010160698 A CN201010160698 A CN 201010160698A CN 101815386 A CN101815386 A CN 101815386A
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China
Prior art keywords
module
resistance
voltage
control circuit
supply
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CN201010160698A
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Chinese (zh)
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CN101815386B (en
Inventor
周明杰
王学军
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海洋王照明科技股份有限公司
深圳市海洋王照明工程有限公司
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Priority to CN2010101606985A priority Critical patent/CN101815386B/en
Publication of CN101815386A publication Critical patent/CN101815386A/en
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Abstract

The invention relates to an LED lamp and a control circuit thereof; the control circuit is connected with an LED light source, and comprises a power supply module, a switch control module, a constant current driving module, a voltage stabilizing module and a micro control module, wherein the power supply module, the switch control module and the constant current driving module are sequentially connected; the power supply module supplies power to the micro control module through the voltage stabilizing module; the micro control module regulates the current output by the constant current driving module by controlling the on/off of the switch control module; the power supply module comprises a battery power supply; the control circuit also comprises a low-voltage protection module; the low-voltage protection module is used for respectively disconnect or connect the switch control module and the voltage stabilizing module when detecting that the voltage of the battery power supply is lower than the protection voltage. According to the embodiment of the technical scheme of the invention, the current leakage of the whole circuit will be reduced to microampere level, so as to reduce the battery loss.

Description

A kind of LED light fixture and control circuit thereof
Technical field
The present invention relates to lighting technology, more particularly, relate to a kind of LED light fixture and control circuit thereof.
Background technology
Therefore advantages such as that led light source has is energy-efficient, the life-span is long, low pressure is controlled are widely used in the various light fixtures.At present, the mobile LED light fixture generally adopts powered battery, and this LED light fixture does not have low-voltage protection circuit; when cell voltage was lower than protection voltage, single-chip microcomputer also had output, and the circuit of LED light fixture has leakage current; the electric weight of consuming cells can be continued like this, thereby battery can be damaged.
Summary of the invention
The technical problem to be solved in the present invention is, the defective of leakage current is arranged when being lower than protection low pressure at the cell voltage of the above-mentioned LED light fixture of prior art, and a kind of LED light fixture and control circuit thereof are provided, and leakage current can be decreased to microampere order.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED lamp control circuit; link to each other with led light source; this control circuit comprises supply module; switch control module; constant-current driven module; Voltage stabilizing module and micro control module; wherein; described supply module; switch control module links to each other successively with constant-current driven module; described supply module is described micro control module power supply by described Voltage stabilizing module; described micro control module is regulated the electric current of constant-current driven module output by the break-make of control switch control module; described supply module comprises battery supply; described control circuit also comprises the low-voltage variation module; described low-voltage variation module is used for when the voltage that detects described battery supply is lower than protection voltage, described switch control module is disconnected with described supply module respectively with described Voltage stabilizing module be connected.
In LED lamp control circuit of the present invention; described low-voltage variation module comprises comparator; driver element; switching tube; be used to provide the reference cell of reference voltage and the sampling unit of the supply voltage that is used to sample; the inverting input of described comparator connects reference cell; the in-phase input end of described comparator connects described supply module by sampling unit; the output of described comparator connects the grid of switching tube by driver element; the drain electrode of described switching tube connects described supply module; the source electrode of described switching tube connects described switch control module, and the output of described comparator also connects described micro control module.
In LED lamp control circuit of the present invention, described driver element comprises first resistance, second resistance, the 3rd resistance, the 4th resistance and triode, wherein, described first resistance and second resistance string are associated between the output and ground of comparator, the tie point of described first resistance and second resistance connects the base stage of triode, the grounded emitter of described triode, the collector electrode of described triode is connected the output of described supply module by the 3rd resistance of two series connection with the 4th resistance, described the 3rd resistance is connected the grid of described switching tube with the tie point of the 4th resistance.
In LED lamp control circuit of the present invention, described reference cell comprises adjustable shunting a reference source of three ends and the 5th resistance, wherein, the anode of the adjustable shunting a reference source of described three ends connects the output of described supply module by described the 5th resistance, the minus earth of the adjustable shunting a reference source of described three ends, the inverting input of the described comparator of reference termination of the adjustable shunting a reference source of described three ends.
In LED lamp control circuit of the present invention, described sampling unit comprises the 6th resistance and the 7th resistance, wherein, described the 6th resistance and the 7th resistance string are associated between the output and ground of described supply module, and described the 6th resistance is connected the in-phase input end of described comparator with the tie point of the 7th resistance.
In LED lamp control circuit of the present invention, described supply module also comprises detecting unit, described detecting unit detects the LED luminosity signal of user's input, and detected luminosity signal is sent to micro control module, micro control module is exported corresponding PWM voltage signal according to described luminosity signal, the corresponding break-make of described PWM voltage signal control switch control module.
In LED lamp control circuit of the present invention; described control circuit also comprises the anti-reverse module that is connected between described supply module and the described low-voltage variation module, and described anti-reverse module is used for connecing at described battery supply to be controlled described supply module and described low-voltage variation module inverse time and disconnect.
In LED lamp control circuit of the present invention, described control circuit also comprises the brightness regulation module, and described micro control module is regulated the electric current of constant-current driven module output by the brightness regulation module, to regulate the luminosity of led light source.
In LED lamp control circuit of the present invention, described control circuit also comprises the short-circuit detecting module, described short-circuit detecting module detects the operating current of led light source, and the output short-circuit triggering signal is to described micro control module during greater than the current threshold that is provided with in it at the operating current of led light source, and described micro control module is controlled described switch control module according to described short circuit triggering signal and disconnected so that described constant-current driven module quits work.
The present invention also constructs a kind of LED light fixture, comprises led light source and the LED lamp control circuit that links to each other with led light source, and described LED lamp control circuit is above-described LED lamp control circuit.
Implement LED light fixture of the present invention and control circuit thereof; when the low-voltage variation module judges that battery supply voltage is lower than protection voltage; switch control module is connected with the supply module disconnection respectively with Voltage stabilizing module; like this; leakage current in the entire circuit will be reduced to microampere order, thereby battery loss is reduced.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the logic diagram of LED lamp control circuit embodiment one of the present invention;
Fig. 2 is the logic diagram of Fig. 1 mesolow protection module embodiment one;
Fig. 3 is the circuit diagram of Fig. 1 mesolow protection module embodiment one;
Fig. 4 is the logic diagram of LED lamp control circuit embodiment two of the present invention;
Fig. 5 is the circuit diagram of LED lamp control circuit embodiment two of the present invention.
Embodiment
As shown in Figure 1; in the logic diagram of LED lamp control circuit embodiment one of the present invention; this LED lamp control circuit links to each other with led light source; and comprise supply module 100, low-voltage variation module 300, switch control module 400, constant-current driven module 500, Voltage stabilizing module 600 and micro control module 700, supply module 100 comprises battery supply.Wherein, supply module 100, low-voltage variation module 300, switch control module 400 and constant-current driven module 500 link to each other successively.Supply module 100 is micro control module 700 power supplies by low-voltage variation module 300 and Voltage stabilizing module 600 also, and micro control module 700 is regulated the electric current of constant-current driven module 500 outputs by the break-make of control switch control module 400.When the control circuit work of this LED light fixture; if battery supply voltage is not less than protection voltage; then supply module 100 is exported the battery supply voltages by low-voltage variation module 300 to Voltage stabilizing module 600; 600 pairs of battery supply voltages of Voltage stabilizing module carry out being micro control module 700 power supplies after lowering and stabilizing blood pressure is handled; simultaneously, supply module 100 is constant-current driven module 500 power supplies through low-voltage variation module 300, switch control module 400.Produce the PWM voltage signal after micro control module 700 powers on, this PWM voltage signal control switch control module 400 is break-make correspondingly, so that constant-current driven module 500 output constant currents realize that led light source sends the light of corresponding bright; If battery supply voltage is lower than protection voltage, then low-voltage variation module 300 disconnects switch control module 400 and Voltage stabilizing module 600 respectively with supply module 100, and like this, the leakage current in the entire circuit will be reduced to microampere order, thereby battery loss is reduced.
Fig. 2 is the logic diagram of Fig. 1 mesolow protection module 300 embodiment one, and this low-voltage variation module comprises comparator U9, driver element 330, switching tube U4, is used to provide the reference cell 320 of reference voltage and the sampling unit 310 of the supply voltage that is used to sample.Wherein, the inverting input of comparator U9 connects reference cell 320, the in-phase input end of comparator U9 connects the output of sampling unit 310, the input of sampling unit 310 connects supply module 100, the output of comparator U9 connects the grid of switching tube U4 by driver element 330, the drain electrode of switching tube U4 connects supply module 100, and the source electrode of switching tube U4 connects switch control module 400.The following describes the operation principle of this low-voltage variation module: reference cell 320 provides reference voltage; supply voltage and reference voltage that comparator U9 is sampled sampling unit 310 compare; if the supply voltage of being sampled is not less than reference voltage; illustrate that battery supply is normal; the voltage that is battery supply is not less than protection voltage; for example protecting voltage is 12V; then the output of comparator U9 is exported high level; and it is open-minded by driver element 330 driving switch pipe U4; at this moment, switch control module 400 is just connected with supply module 100.On the contrary; if the supply voltage of being sampled is lower than reference voltage, illustrate that battery supply is undesired, promptly the voltage of battery supply is lower than protection voltage; the output output low level of comparator U9; this low level is ended by driver element 330 control switch pipe U4, and like this, switch control module 400 just can not be connected with supply module 100; therefore; during less than protection voltage, the leakage current in the entire circuit will be reduced to microampere order, thereby battery loss is reduced at the voltage of battery supply.
Fig. 3 is the circuit diagram of Fig. 1 mesolow protection module embodiment one, and this low-voltage variation module 300 comprises and is used to the sample sampling module 310 of supply voltage, the base modules 320 that is used to provide reference voltage, comparator U9, driver module 330 and switching tube U4.The preferred model of switching tube is the MOS chip U4 of STS5PF 30L, this MOS chip is the metal-oxide-semiconductor of low-power consumption, wherein, base modules 320 comprises resistance R 41 and the adjustable shunting a reference source of three ends Z1, and the minus earth of three ends are adjustable shunting a reference source Z1, its anode meets the positive output end BAT+ of supply voltage by resistance R 41, and it is with reference to the inverting input of termination comparator U9.Sampling module 310 comprises resistance R 43 and resistance R 44, and resistance R 43 and resistance R 44 be connected between the positive output end BAT+ and ground of supply voltage, and the tie point of resistance R 43 and resistance R 44 connects the in-phase input end of comparator U9.Driver module 330 comprises resistance R 5, resistance R 7, resistance R 2, resistance R 3 and triode Q2, and resistance R 5 and resistance R 7 are connected between the output and ground of comparator U9, the tie point of resistance R 5 and resistance R 7 connects the base stage of triode Q2, the grounded emitter of triode Q2, its collector electrode is connected the positive output end BAT+ of supply voltage with resistance R 3 by the resistance R 2 of series connection, the tie point of resistance R 2 and resistance R 3 is connected the 4th pin (grid) of MOS chip U4, the the 1st to 3 pin (source electrode) of MOS chip U4 connects the positive output end BAT+ of supply voltage in the lump, and the 5th to 8 pin (drain electrode) of MOS chip U4 connects switch control module 400 (not shown) in the lump.The following describes the operation principle of this low-voltage variation module: the reference edge output reference voltage of the adjustable shunting a reference source of the three ends Z1 in the reference cell 320, resistance R 44 in the sampling unit 310 and resistance R 43 are by the dividing potential drop battery supply voltage of sampling.Comparator U9 compares the supply voltage and the reference voltage of being sampled; if the supply voltage of being sampled is not less than reference voltage; illustrate that battery supply is normal; the voltage that is battery supply is not less than protection voltage; for example protecting voltage is 12V, and then the output of comparator U9 is exported high level, and open-minded by resistance R 5 and resistance R 7 dividing potential drop rear drive switching tube U4; at this moment, switch control module 400 is just connected with supply module 100.On the contrary; if the supply voltage of being sampled is lower than reference voltage, illustrate that battery supply is undesired, promptly the voltage of battery supply is lower than protection voltage; the output output low level of comparator U9; this low level by resistance R 5 and resistance R 7 dividing potential drops after control switch pipe U4 end, like this, switch control module 400 just can not be connected with supply module 100; therefore; during less than protection voltage, the leakage current in the entire circuit will be reduced to microampere order, thereby battery loss is reduced at the voltage of battery supply.
As shown in Figure 4; in the logic diagram of LED lamp control circuit embodiment two of the present invention; this LED lamp control circuit is connected with led light source; and it comprises supply module 100, anti-reverse module 200, low-voltage variation module 300, switch control module 400, constant-current driven module 500, Voltage stabilizing module 600, micro control module 700, brightness regulation module 800 and short-circuit detecting module 900, and supply module 100 also comprises battery supply and detecting unit 110.Wherein, supply module 100, anti-reverse module 200, low-voltage variation module 300, switch control module 400 and constant-current driven module 500 link to each other successively; supply module 100 is micro control module 700 power supplies by anti-reverse module 200, low-voltage variation module 300 and Voltage stabilizing module 600, and supply module 100 is constant-current driven module 500 power supplies by anti-reverse module 200, low-voltage variation module 300, switch control module 400 also.Micro control module 700 is regulated the electric current of constant-current driven module 500 outputs by the break-make of control switch control module 400.Micro control module 700 is also finely tuned by the electric current of 800 pairs of constant-current driven modules of brightness regulation module, 500 outputs, to regulate the luminosity of led light source.The operating current of 900 pairs of led light sources of short-circuit detecting module detects, and the output short-circuit triggering signal is to micro control module 700 during greater than the current threshold that is provided with in it at the operating current of led light source, and micro control module 700 disconnects so that constant-current driven module 500 quits work according to short circuit triggering signal control switch control module 400.The following describes the operation principle of this control circuit: if battery supply voltage is not less than protection voltage; and when battery supply does not have reversal connection; to Voltage stabilizing module 600 output supply voltages, 600 pairs of battery supply voltages of Voltage stabilizing module carry out lowering and stabilizing blood pressure to be handled the back and is micro control module 700 power supplies supply module 100 by anti-reverse module 200 and low-voltage variation module 300.Simultaneously, supply module 100 is constant-current driven module 500 power supplies through anti-reverse module 200, low-voltage variation module 300, switch control module 400.If detecting unit 110 detects the LED luminosity signal of user's input, and this detection signal is sent into micro control module 700.Micro control module 700 produces the PWM voltage signal according to this detection signal, and this PWM voltage signal control switch control module 400 is break-make correspondingly, makes the corresponding constant current of constant-current driven module 500 outputs, realizes that led light source sends the light of corresponding bright; If battery supply voltage is lower than protection voltage, then low-voltage variation module 300 disconnects switch control module 400 and Voltage stabilizing module 600 respectively with supply module 100; If the battery supply reversal connection, then anti-reverse module 200 disconnects low-voltage variation module 300 and supply module 100.Micro control module 700 is also regulated by the electric current of 800 pairs of constant-current driven modules of brightness regulation module, 500 outputs, to regulate the luminosity of led light source.The operating current of 900 pairs of led light sources of short-circuit detecting module detects, and the output short-circuit triggering signal is to micro control module 700 during greater than the current threshold that is provided with in it at the operating current of led light source, and micro control module 700 disconnects so that constant-current driven module 500 quits work according to short circuit triggering signal control switch control module 400.
In the circuit diagram of the LED lamp control circuit embodiment two of the present invention shown in Fig. 5; this LED lamp control circuit comprises supply module 100, anti-reverse module 200, low-voltage variation module 300, switch control module 400, constant-current driven module 500, Voltage stabilizing module 600, micro control module 700, brightness regulation module 800 and short-circuit detecting module 900, will be elaborated to each module respectively below:
1. supply module 100
Supply module 100 comprises battery supply and detecting unit 110, and wherein, the positive output end of battery supply is end BAT+, and inserts by interface J4-1; Its negative output terminal ground connection, and by interface J4-2 access.In addition, also for this battery supply has been equipped with charging inlet J5-1, J5-2, the positive pole of diode D2 connects charging inlet J5-1, and its negative pole links to each other with interface J4-1, and diode D2 prevents the battery reversal connection when playing charging.In detecting unit 110, end BAT+ connects the positive pole (end SW) of diode D6 by switch S 1, the negative pole of diode D6 connects Voltage stabilizing module 600, resistance R 13 and resistance R 15 are connected between the positive pole and ground of diode D6, the one terminating resistor R13 of resistance R 14 and the tie point of resistance R 15, its other end (end SW-IN) connects micro control module 700.The anodal BAT+ of battery supply also takes over control reversal connection module 200 and low-voltage variation module 300.
2. anti-reverse module 200
Anti-reverse module 200 comprises switching tube U8, resistance R 23 and resistance R 25; the preferred model of switching tube U8 is the MOS chip U8 of STS5PF 30L; the the 5th to 8 pin (drain electrode) of MOS chip U8 meets end BAT+; its the 1st to 3 pin (source electrode) is according to this by resistance R 25 and resistance R 23 ground connection; its the 1st to 3 pin (source electrode) also connects low-voltage variation module 300, and its 4th pin (grid) connects the tie point of resistance R 23 and resistance R 25.
3. the low-voltage variation module 300
Low-voltage variation module 300 is not done at this and to be given unnecessary details as previously mentioned.
4. switch control module 400
In switch control module 400; the preferred model of switching tube U10 is the MOS chip U10 of STS5PF30L; the the 1st to 3 pin (source electrode) of MOS chip U10 connects the output of low-voltage variation module 300; promptly hold VCC; its the 5th to 8 pin (drain electrode) connects constant-current driven module 500; its the 4th pin connects the collector electrode of triode Q1 by resistance R 47; the grounded emitter of triode Q1; the end of the base stage connecting resistance R48 of triode Q1; the other end of resistance R 48 (end POW-CON) connects micro control module 700, and resistance R 45 is connected between the base stage and emitter of triode Q1.
5. constant-current driven module 500
Constant-current driven module 500 comprises filter inductance L1 and three tunnel constant current unit 510,520,530, wherein, filter inductance L1 one end connects the 5th to 8 pin of MOS chip U10, its other end connects three tunnel constant current unit 510,520,530, three tunnel constant current unit 510,520,530 are corresponding with three groups of led light sources respectively, below are that example describes with constant current unit 510 only, are to be understood that, constant current unit 520,530 is similar to the circuit structure of constant current unit 510, does not do at this and gives unnecessary details.In constant current unit 510, the input IN of constant-current driven chip U1 connects the other end of filter inductance L1, resistance R 21 is connected between the input IN and Enable Pin EN of constant-current driven chip U1, capacitor C 10 is connected between the input IN and ground of constant-current driven chip U1, the output SW of constant-current driven chip U1 connects the anode (promptly holding J11-2) and the short-circuit detecting end LIGHT1+ of first group of led light source by inductance L 2, the plus earth of diode D1, its negative pole meets the output SW of constant-current driven chip U1, and capacitor C 16 is connected between end J11-2 and the ground.The earth terminal GND ground connection of constant-current driven chip U1.Between the feed end BST and output SW of the constant-current driven chip U1 that capacitor C 13 connects.The feedback end FB of constant-current driven chip U1 is by the resistance R 20 and resistance R 24 ground connection of series connection, and the tie point of resistance R 20 and resistance R 24 connects the negative terminal of first group of led light source (promptly holding J11-1), and the feedback end FB of constant-current driven chip U1 also connects brightness regulation end DIM1.
6. Voltage stabilizing module 600
In Voltage stabilizing module 600, capacitor C 4 and capacitor C 5 are connected in parallel between the negative pole and ground of diode D6, the input of voltage stabilizing chip U5 connects the negative pole of diode D5 by resistance R 11, the positive pole of diode D5 meets end VCC, the output of voltage stabilizing chip U5 is end+5V, be used to export+voltage of 5V, capacitor C 6 and capacitor C 7 are connected in parallel between the output and ground of voltage stabilizing chip U5, the earth terminal ground connection of voltage stabilizing chip U5.
7. micro control module 700
Micro control module 700 comprises single-chip microcomputer U7, reset unit 710, reference cell 720 and indicating member 730.
The preferred model of single-chip microcomputer U7 is the single-chip microcomputer of PIC16F684, the 1st pin of single-chip microcomputer U7 meets end+5V, and its 3rd pin meets end SHORT-DETECT, and its 4th pin meets end RESET, its the 5th pin meets end PWM-OUT, its the 6th pin meets end SW-IN, and its 7th pin meets end SLED1, and its 8th pin meets end SLED2, its the 9th pin meets end SLED3, its the 10th pin meets end POW-CON, and its 12nd pin connects end VREF, its 14th pin ground connection by resistance R 4.
In reset unit 710, resistance R 26 and resistance R 27 are connected between end+5V and the end RESET, and capacitor C 9 is connected between the tie point and ground of resistance R 26 and resistance R 27.
In reference cell 720, the plus earth of three ends are adjustable shunting a reference source U6, its negative electrode and reference edge meet end+5V by resistance R 19 in the lump, and its reference edge also meets end VREF.
In indicating member 730, port J2-1, J2-2, J2-3 be link BAT+, end SW+, end+5V respectively, be used for whether pilot cell power supply, switch S 1 state and Voltage stabilizing module output voltage be normal respectively, port J2-4, J2-5, J2-6 meet end SLED1, end SLED2, end SLED3 by resistance R 34, resistance R 35, resistance R 36 respectively, are used for indicating respectively the operating state of three groups of led light sources.
8. the brightness regulation module 800
Brightness regulation module 800 comprises respectively and three groups of brightness regulation submodules 810,820,830 that led light source is corresponding, be that example describes only below with the brightness regulation submodule 810 corresponding with first group of led light source, should understand, the circuit structure of brightness regulation submodule 820,830 and brightness regulation submodule 810 is similar, does not do at this and gives unnecessary details.In brightness regulation submodule 810, the resistance R 8 that end PWM-OUT passes through to connect is connected the positive pole of diode D11 with resistance R 9, the negative pole link DIM1 of diode D11, and capacitor C 1 is connected between the tie point and ground of resistance R 8 and resistance R 9.
9. the short-circuit detecting module 900
Short-circuit detecting module 900 comprises resistance R 31, resistance R 32, resistance R 33 and diode D7, diode D8 and diode D9, resistance R 32 and resistance R 31 are connected between end+5V and the end SHORT-DETECT, resistance R 33 1 ends connect the tie point of resistance R 32 and resistance R 31, its other end connects the positive pole of diode D7, D8, D9 respectively, and the negative pole of diode D7, D8, D9 meets end LIGHT1+, LIGHT2+, the LIGHT3+ of three groups of led light sources respectively.
The operation principle of the control circuit of above-mentioned LED light fixture below is described:
At first, single-chip microcomputer U7 can be set in initial program and detect when holding SW-IN that a high level pulse is arranged, and led light source is sent out high light; Detecting end SW-IN when two high level pulses are arranged, led light source is sent out the low light level; Detecting end SW-IN when three high level pulses are arranged, led light source is not luminous, but the present invention is not limited to above-mentioned setting.
When this circuit working; the voltage of Voltage stabilizing module middle-end+5V output 5V; single-chip microcomputer U7 powers on and starts working; then; whether single-chip microcomputer U7 test side SW-IN has the high level pulse signal; if single-chip microcomputer U7 this moment detects end SW-IN a high level pulse signal is arranged; and do not connect anti-and battery supply voltage when being not less than protection voltage at battery supply; single-chip microcomputer U7 control end POW-CON exports a PWM voltage signal; the corresponding break-make of the one PWM voltage signal control MOS chip U10; so that constant-current driven module 500 outputs first constant current, thereby realize that led light source sends high light.Similarly; if single-chip microcomputer U7 this moment detects end SW-IN two high level pulse signals are arranged; and do not connect anti-and battery supply voltage when being not less than protection voltage at battery supply; single-chip microcomputer U7 control end POW-CON exports the 2nd PWM voltage signal; the corresponding break-make of the 2nd PWM voltage signal control MOS chip U10; so that constant-current driven module 500 outputs second constant current, thereby realize that led light source sends the low light level, so just realize the led light source adjustable brightness.If single-chip microcomputer U7 this moment detects end SW-IN three high level pulse signals are arranged, then single-chip microcomputer U7 stops the voltage signal to end POW-CON output PWM, and MOS chip U10 ends, thereby it is luminous that led light source is stopped.In addition, single-chip microcomputer U7 can realize fine setting to three groups of led light source luminosity by the output voltage of control end PWM-OUT, promptly, value by the voltage on the feedback end FB that regulates constant-current driven chip U1, constant-current driven chip U2 and constant-current driven chip U3 simultaneously, thereby the size of current of the output SW output of constant-current driven chip U1, constant-current driven chip U2 and constant-current driven chip U3 is changed, thereby the luminosity of realizing led light source change.The operating current of 900 pairs of led light sources of short-circuit detecting module detects, when any one the operating current in three groups of led light sources during greater than its built-in current threshold, with 3rd pin of output short-circuit triggering signal to single-chip microcomputer U7, single-chip microcomputer U7 disconnects so that constant-current driven module 500 quits work by control switch control module 400, can prevent from like this circuit is caused damage.
When the battery supply reversal connection, MOS chip U8 ends, thereby battery supply and subsequent conditioning circuit are disconnected, and plays the effect of protection battery.
When low-voltage variation module 300 is lower than protection voltage at the voltage that detects battery supply, switch control module 400 is connected with supply module 100 disconnections with Voltage stabilizing module 600.Like this, the leakage current in the entire circuit will be reduced to microampere order, thereby battery loss is reduced.
In the present invention, the control circuit of LED light fixture available chip model is not limited to that the foregoing description is mentioned to be arrived, and, can select to be provided with according to the side circuit demand to the setting of current threshold and voltage threshold.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Claims (10)

1. LED lamp control circuit; link to each other with led light source; this control circuit comprises supply module (100); switch control module (400); constant-current driven module (500); Voltage stabilizing module (600) and micro control module (700); wherein; described supply module (100); switch control module (400) links to each other successively with constant-current driven module (500); described supply module (100) is described micro control module (700) power supply by described Voltage stabilizing module (600); described micro control module (700) is regulated the electric current of constant-current driven module (500) output by the break-make of control switch control module (400); described supply module (100) comprises battery supply; it is characterized in that; described control circuit also comprises low-voltage variation module (300); described low-voltage variation module (300) is used for when the voltage that detects described battery supply is lower than protection voltage, described switch control module (400) is disconnected with described supply module (100) respectively with described Voltage stabilizing module (600) be connected.
2. LED lamp control circuit according to claim 1; it is characterized in that; described low-voltage variation module (300) comprises comparator (U9); driver element (330); switching tube (U4); be used to provide the reference cell (320) of reference voltage and the sampling unit (310) of the supply voltage that is used to sample; the inverting input of described comparator (U9) connects reference cell (320); the in-phase input end of described comparator (U9) connects supply module (100) by sampling unit (310); the output of described comparator (U9) connects the grid of switching tube (U4) by driver element (330); the drain electrode of described switching tube (U4) connects described supply module (100), and the source electrode of described switching tube (U4) connects described switch control module (400).
3. LED lamp control circuit according to claim 2, it is characterized in that, described driver element (330) comprises first resistance (R5), second resistance (R7), the 3rd resistance (R2), the 4th resistance (R3) and triode (Q2), wherein, described first resistance (R5) and second resistance (R7) are connected between the output and ground of comparator (U4), the tie point of described first resistance (R5) and second resistance (R7) connects the base stage of triode (Q2), the grounded emitter of described triode (Q2), the collector electrode of described triode (Q2) is connected the output of described supply module (100) by the 3rd resistance (R2) of two series connection with the 4th resistance (R3), described the 3rd resistance (R2) is connected the grid of described switching tube (U4) with the tie point of the 4th resistance (R3).
4. LED lamp control circuit according to claim 2, it is characterized in that, described reference cell (320) comprises adjustable shunting a reference sources of three ends (Z1) and the 5th resistance (R41), wherein, the anode of shunting a reference source (Z1) that described three ends are adjustable connects the output of described supply module (100) by described the 5th resistance (R41), the minus earth of shunting a reference source (Z1) that described three ends are adjustable, the inverting input of the described comparator of reference termination (U9) of shunting a reference source (Z1) that described three ends are adjustable.
5. LED lamp control circuit according to claim 2, it is characterized in that, described sampling unit (310) comprises the 6th resistance (R43) and the 7th resistance (R44), wherein, described the 6th resistance (R43) and the 7th resistance (R44) are connected between the output and ground of described supply module (100), and described the 6th resistance (R43) is connected the in-phase input end of described comparator (U9) with the tie point of the 7th resistance (R44).
6. LED lamp control circuit according to claim 1, it is characterized in that, described supply module (100) also comprises detecting unit (110), described detecting unit (110) detects the LED luminosity signal of user's input, and detected luminosity signal is sent to micro control module (700), micro control module (700) is exported corresponding PWM voltage signal according to described luminosity signal, the corresponding break-make of described PWM voltage signal control switch control module (400).
7. LED lamp control circuit according to claim 1; it is characterized in that; described control circuit also comprises the anti-reverse module (200) that is connected between described supply module (100) and the described low-voltage variation module (300), and described anti-reverse module (200) is used for connecing at described battery supply to be controlled described supply module (100) and described low-voltage variation module (300) inverse time and disconnect.
8. LED lamp control circuit according to claim 1, it is characterized in that, described control circuit also comprises brightness regulation module (800), described micro control module (700) is regulated the electric current of constant-current driven module (500) output by brightness regulation module (800), to regulate the luminosity of led light source.
9. LED lamp control circuit according to claim 1, it is characterized in that, described control circuit also comprises short-circuit detecting module (900), described short-circuit detecting module (900) detects the operating current of led light source, and the output short-circuit triggering signal is to described micro control module (700) during greater than the current threshold that is provided with in it at the operating current of led light source, and described micro control module (700) is controlled described switch control module (400) according to described short circuit triggering signal and disconnected so that described constant-current driven module (500) quits work.
10. a LED light fixture comprises led light source and the LED lamp control circuit that links to each other with led light source, it is characterized in that, described LED lamp control circuit is each described LED lamp control circuit of claim 1-9.
CN2010101606985A 2010-04-30 2010-04-30 LED lamp and control circuit thereof CN101815386B (en)

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CN104852555A (en) * 2014-02-13 2015-08-19 三垦电气株式会社 Switch driving device, power supply device and method thereof
CN105282896A (en) * 2014-05-27 2016-01-27 宁波高新区赛尔富电子有限公司 Power supply control circuit of LED lamp
CN105282896B (en) * 2014-05-27 2019-08-02 赛尔富电子有限公司 A kind of LED lamp power control circuit
CN105846811A (en) * 2015-01-16 2016-08-10 海洋王照明科技股份有限公司 Hall switch control circuit
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