CN101801145B - Led lamp control circuit and led lamp - Google Patents
Led lamp control circuit and led lamp Download PDFInfo
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- CN101801145B CN101801145B CN2010101540827A CN201010154082A CN101801145B CN 101801145 B CN101801145 B CN 101801145B CN 2010101540827 A CN2010101540827 A CN 2010101540827A CN 201010154082 A CN201010154082 A CN 201010154082A CN 101801145 B CN101801145 B CN 101801145B
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Abstract
The invention relates to an LED lamp control circuit and an LED lamp. The LED lamp control circuit comprises a power supply module, a switch control module, a constant-current driving module, a voltage reducing and stabilizing module and a micro-control module, wherein the power supply module comprises a direct-current power supply, a control switch and a detection circuit, the control switch is used for controlling the on or off of the direct-current power supply, and the detection circuit generates a detection signal through detecting the on-off state of the control switch; the micro-control module controls the switch control module to generate a first output voltage or a second output voltage according to the detection signal; and the constant-current driving module generates a first constant current for an LED light source to work in a strong-light mode according to the first output voltage, or the constant-current driving module generates a second constant current for the LED light source to work in a weak-light mode according to the second output voltage. When the LED light source in the invention is turned off, the direct-current power supply does not need to supply power for the micro-control module so that the electric quantity is saved.
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
Therefore advantages such as in the prior art, 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.The mobile LED light fixture generally adopts powered battery, in existing LED lamp control circuit, control switch is arranged between single-chip microcomputer and the ground, single-chip microcomputer produces a square-wave signal by the operate condition that detects this control switch, this square-wave signal control constant-current drive circuit produces a constant current, is the led light source power supply.Single-chip microcomputer also can be controlled this led light source and be extinguished by detecting the operate condition of this control switch.When led light source is in when extinguishing state, this single-chip microcomputer also is in detected state always, and battery is always to the single-chip microcomputer power supply, so increased meaningless electric quantity consumption.
Summary of the invention
The technical problem to be solved in the present invention is, single-chip microcomputer also needs powered battery to increase the defective of meaningless electric quantity consumption when extinguishing state thereby be at above-mentioned led light source in the prior art, and a kind of LED lamp control circuit and LED light fixture of saving electric weight is provided.
One of 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, it comprises supply module, switch control module, constant-current driven module, lowering and stabilizing blood pressure module and micro control module, described supply module, switch control module and constant-current driven module link to each other successively, described micro control module links to each other with switch control module with supply module, lowering and stabilizing blood pressure module respectively, and described lowering and stabilizing blood pressure module links to each other with supply module; Described supply module comprises DC power supply, described supply module also comprises control switch and testing circuit, described control switch is used for the described DC power supply of control to be opened or turn-offs, and described testing circuit produces a detection signal by the on off state that detects described control switch;
Described micro control module is controlled described switch control module according to this detection signal and is produced first output voltage or second output voltage, described constant-current driven module produces one according to described first output voltage and is used for described led light source with first constant current of high light pattern work, and perhaps described constant-current driven module is used for described led light source with second constant current of low light level pattern work according to described second output voltage generation one.
Two of the technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED light fixture, it comprises LED control circuit and led light source, described LED lamp control circuit comprises supply module, switch control module, constant-current driven module, lowering and stabilizing blood pressure module and micro control module, described supply module, switch control module and constant-current driven module link to each other successively, described micro control module links to each other with switch control module with supply module, lowering and stabilizing blood pressure module respectively, and described lowering and stabilizing blood pressure module links to each other with supply module; Described supply module comprises DC power supply; Described supply module also comprises control switch and testing circuit, and described control switch is used for the described DC power supply of control to be opened or turn-off, and described testing circuit produces a detection signal by the on off state that detects described control switch;
Described micro control module is controlled described switch control module according to this detection signal and is produced first output voltage or second output voltage, described constant-current driven module produces one according to described first output voltage and is used for described led light source with first constant current of high light pattern work, and perhaps described constant-current driven module is used for described led light source with second constant current of low light level pattern work according to described second output voltage generation one.
LED lamp control circuit of the present invention, described control switch comprises a moving contact, first fixed contact, second fixed contact and the 3rd fixed contact, described moving contact is connected to DC power supply, and described first fixed contact is unsettled, and described second fixed contact and the 3rd fixed contact are connected to described testing circuit.
LED lamp control circuit of the present invention, described testing circuit comprises first resistance, second resistance and first diode, the negative pole of first diode is connected to described second fixed contact, the positive pole of first diode is connected to described the 3rd fixed contact, and also successively by first resistance and second grounding through resistance, the positive pole of first diode is exported described detection signal to the positive pole of first diode.
LED lamp control circuit of the present invention, described LED lamp control circuit also comprises anti-reverse module, described anti-reverse module is arranged between described supply module and the switch control module, and described anti-reverse module connects in described DC power supply and controls described supply module and switch control module disconnection inverse time.
LED lamp control circuit of the present invention, described LED lamp control circuit also comprises the short-circuit detecting module, described short-circuit detecting module links to each other with led light source with micro control module respectively, 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 arranges 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.
LED lamp control circuit of the present invention, described micro control module comprises single-chip microcomputer, described short-circuit detecting module comprises the 4th diode, the 21 resistance, the 22 resistance and the 23 resistance, the negative pole of the 4th diode is connected to the positive pole of described led light source, the positive pole of the 4th diode is connected to the feeder ear of described single-chip microcomputer successively by the 23 resistance and the 22 resistance, the node of the 23 resistance and the 22 resistance is connected to an I/O end of described single-chip microcomputer by the 21 resistance.
LED lamp control circuit of the present invention, described LED lamp control circuit also comprises the brightness regulation module, described brightness regulation module links to each other with constant-current driven module with micro control module respectively, described micro control module is regulated first constant current of constant-current driven module output or the size of second constant current by the brightness regulation module, to regulate the luminosity of led light source.
LED lamp control circuit of the present invention, described micro control module comprises single-chip microcomputer, described constant-current driven module comprises constant-current driven chip, described brightness regulation module comprises the 18 resistance, the 19 resistance, the 5th diode and the 8th electric capacity, the positive pole of the 5th diode is connected to another I/O end of described single-chip microcomputer by the 18 resistance and the 19 resistance, the negative pole of the 5th diode is connected to the feedback end of described constant-current driven chip, and the node of the 18 electric capacity and the 19 resistance is by the 8th capacity earth.
LED lamp control circuit of the present invention,
Described micro control module comprises single-chip microcomputer;
Described anti-reverse module comprises first switching tube, the 7th resistance and the 8th resistance, the drain electrode of first switching tube is connected to second fixed contact, the source electrode of first switching tube is successively by the 8th resistance and the 7th grounding through resistance, and the grid of first switching tube is by the 7th grounding through resistance;
Described lowering and stabilizing blood pressure module comprises low-dropout regulator, the 11 resistance, first electric capacity and second electric capacity, the input of low-dropout regulator is connected to the source electrode of first switching tube by the 11 resistance, first electric capacity is connected between the source electrode and ground of first switching tube, second electric capacity is connected between the output and ground of low-dropout regulator, and the output of low-dropout regulator is connected to the feeder ear of described single-chip microcomputer;
Described switch control module comprises the second switch pipe, the 3rd switching tube, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 9th resistance and the tenth resistance, the source electrode of second switch pipe is connected to the source electrode of first switching tube, and the source electrode of second switch pipe is connected to the collector electrode of the 3rd switching tube successively by the tenth resistance and the 3rd resistance, the grounded emitter of the 3rd switching tube, the node of the tenth resistance and the 3rd resistance is connected to the grid of second switch pipe, the base stage of the 3rd switching tube by the 4th resistance be connected to described single-chip microcomputer one the input output, and the base stage of the 3rd switching tube is by the 6th grounding through resistance, the drain electrode of second switch pipe is successively by the 9th resistance and the 5th grounding through resistance, the node of the 9th resistance and the 5th resistance be connected to single-chip microcomputer another input output;
Described constant-current driven module comprises first inductance and LED constant-current circuit, described LED constant-current circuit comprises constant-current driven chip, the 15 resistance, the 16 resistance, the 17 resistance, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 3rd diode and second inductance, the input of described constant-current driven chip is connected to the drain electrode of second switch pipe by first inductance, the 16 resistance is connected between the input and Enable Pin of constant-current driven chip, the 5th electric capacity is connected between the input and ground of constant-current driven chip, the output of constant-current driven chip is connected to the anode of led light source by second inductance, the feedback end of constant-current driven chip is successively by the 15 resistance and the 17 grounding through resistance, the node of the 15 resistance and the 17 resistance is connected to the negative terminal of led light source, the negative pole of the 3rd diode is connected to the output of constant-current driven chip, the plus earth of the 3rd diode, the 6th electric capacity is connected between the output and feed end of constant-current driven chip, and the 7th electric capacity is connected between the anode and ground of led light source.
Implement LED lamp control circuit of the present invention and LED light fixture, have following beneficial effect: this LED lamp control circuit is by disconnecting control switch, led light source is in extinguishes state, this moment, micro control module was not worked, DC power supply does not need to have saved the electric weight that consumes when led light source extinguishes state to the micro control module power supply.And, in supply module, testing circuit produces a detection signal according to the on off state of control switch, micro control module produces first output voltage or second output voltage according to this detection signal control switch control module, constant-current driven module is luminous with high light pattern or low light level pattern according to this first output voltage or second output voltage control led light source, has namely realized the switching of the light-emitting mode of led light source.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the theory diagram of LED lamp control circuit first preferred implementation of the present invention;
Fig. 2 is the theory diagram of LED lamp control circuit second preferred implementation of the present invention;
Fig. 3 is the circuit diagram of LED lamp control circuit shown in Figure 2.
Embodiment
As shown in Figure 1, be the theory diagram of LED lamp control circuit first preferred implementation of the present invention.LED lamp control circuit of the present invention links to each other with led light source, and it comprises supply module 1, switch control module 3, constant-current driven module 4, lowering and stabilizing blood pressure module 5 and micro control module 6.Wherein, supply module 1, switch control module 3 and constant-current driven module 4 link to each other successively, and micro control module 6 links to each other with supply module 1, lowering and stabilizing blood pressure module 5 and switch control module 3 respectively, and lowering and stabilizing blood pressure module 5 links to each other with supply module 1.
Supply module 1 comprises DC power supply 101, control switch K and testing circuit 102.Thereby the output voltage of 5 pairs of DC power supply 101 of lowering and stabilizing blood pressure module carries out the lowering and stabilizing blood pressure processing is micro control module 6 power supplies.Supply module 1 is constant-current driven module 4 power supplies by switch control module 3 backs.Control switch K is used for control DC power supply 101 and opens or turn-off, and testing circuit 102 produces a detection signal by the on off state that detects control switch K.Micro control module 6 produces first output voltage or second output voltage according to this detection signal control switch control module 3.Constant-current driven module 4 produces one according to described first output voltage and is used for described led light source with first constant current of high light pattern work, perhaps, constant-current driven module 4 produces one for second constant current of described led light source with the work of low light level pattern according to described second output voltage.
As shown in Figure 2, be the theory diagram of LED lamp control circuit second preferred implementation of the present invention, be that with the difference of first preferred implementation shown in the figure one described LED lamp control circuit also comprises anti-reverse module 2, brightness regulation module 7 and short-circuit detecting module 8.Wherein, anti-reverse module 2 is arranged between supply module 1 and the switch control module 3, and link to each other with lowering and stabilizing blood pressure module 5, brightness regulation module 7 links to each other with constant-current driven module 4 with micro control module 6 respectively, and short-circuit detecting module 8 also links to each other with constant-current driven module 4 with micro control module 6 respectively.
The operating current of 8 pairs of led light sources of short-circuit detecting module detects, and the output short-circuit triggering signal is to micro control module 6 during greater than the current threshold that arranges in it at the operating current of led light source, and micro control module 6 is controlled described switch control module 3 according to described short circuit triggering signal and disconnected so that described constant-current driven module 4 quits work.
In addition, above-mentioned DC power supply 101 is battery, so supply module 1 also is included as the charging device that battery provides charging.
As shown in Figure 3, be the circuit diagram of LED lamp control circuit shown in Figure 2.Described control switch K comprises a moving contact S0, the first fixed contact S1, the second fixed contact S2 and the 3rd fixed contact S3.Described testing circuit 102 comprises first resistance R 1, second resistance R 2 and the first diode D1, described moving contact S0 is connected to DC power supply 101, the described first fixed contact S1 is unsettled, the described second fixed contact S2 is connected to the negative pole of the first diode D1, described the 3rd fixed contact S3 is connected to the positive pole of the first diode D1, by first resistance R 1, second resistance R, 2 ground connection, the positive pole of first diode is exported described detection signal to the positive pole of the first diode D1 successively.
In the present embodiment; DC power supply 101 adopts battery; this battery inserts by Wiring port JP2; simultaneously; supply module 1 also is included as the charging device 103 that battery provides charging, and this charging device 103 inserts by Wiring port JP1, in addition; the 6th diode D6 is connected serially between Wiring port JP1 and the Wiring port JP2, shields.
Wherein, anti-reverse module 2 comprises the first switching tube Q1, the 7th resistance R 7 and the 8th resistance R 8.The drain electrode of the first switching tube Q1 is connected to the second fixed contact S2, and the source electrode of the first switching tube Q1 is successively by the 8th resistance R 8 and the 7th resistance R 7 ground connection, and the grid of the first switching tube Q1 is by the 7th resistance R 7 ground connection.
Wherein, lowering and stabilizing blood pressure module 5 comprises low-dropout regulator U4, the 11 resistance R 11, first capacitor C 1, second capacitor C 2, the 3rd capacitor C 3 and the 4th capacitor C 4.The input of low-dropout regulator U4 is connected to the source electrode of the first switching tube Q1 by the 11 resistance R 11, be connected between the source electrode and ground of the first switching tube Q1 after first capacitor C 1 and 3 parallel connections of the 3rd capacitor C, be connected between the output and ground of low-dropout regulator U4 after second capacitor C 2 and 4 parallel connections of the 4th capacitor C, the output of low-dropout regulator U4 is connected to the feeder ear of micro control module 6.
Wherein, micro control module 6 comprises single-chip microcomputer U6, reset circuit, observation circuit, reference circuit and indicating circuit.Preferably, to select model for use be the single-chip microcomputer of PIC16F684 to single-chip microcomputer U6.
Institute's reset circuit comprises the 26 resistance R 26, the 27 resistance R 27 and the 9th capacitor C 9.The feeder ear of single-chip microcomputer U6 is that pin 1 passes through the 26 resistance R 26 and the 9th capacitor C 9 ground connection successively, and the node of the 26 resistance R 26 and the 9th capacitor C 9 is pin 4 by the reset terminal that the 27 resistance R 27 is connected to single-chip microcomputer U6.
Described observation circuit comprises the first voltage-stabiliser tube D2, the 12 resistance R 12, the 13 resistance R 13 and the 14 resistance R 14.The positive pole of the first diode D1 is successively by the 12 resistance R 12 and the 14 resistance R 14 ground connection, the node of the 12 resistance R 12 and the 14 resistance R 14 is pin 6 by the 3rd I/O end that the 13 resistance R 13 is connected to described single-chip microcomputer U6, the 3rd I/O end that the plus earth of the first voltage-stabiliser tube D2, the negative pole of the first voltage-stabiliser tube D2 are connected to described single-chip microcomputer U6 is pin 6.Single-chip microcomputer U6 produces a control signal according to the described detection signal of the positive pole output of the first diode D1, this control signal is pin 10 outputs by the second I/O end of single-chip microcomputer U6, and this control signal will be controlled described switch control module 3 and produce first output voltage or second output voltage.
Described reference circuit comprises three ends adjustable shunting a reference source U5 and the 20 resistance R 20, the feeder ear of single-chip microcomputer U6 is pin 1 is connected to the adjustable shunting a reference source of three ends U5 by the 20 resistance R 20 negative electrode, the plus earth of three ends are adjustable shunting a reference source U5, the node of the 20 resistance R 20 and the adjustable shunting a reference source of three ends U5 is connected to the reference edge of the adjustable shunting a reference source of three ends U5, and the reference edge of three ends are adjustable shunting a reference source U5 is pin 12 by the reference voltage external connection end that the 25 resistance R 25 is connected to single-chip microcomputer U6 also.
Wherein, switch control module 3 comprises second switch pipe Q2, the 3rd switching tube Q3, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 9th resistance R 9 and the tenth resistance R 10.The source electrode of second switch pipe Q2 is connected to the source electrode of the first switching tube Q2, and the source electrode of second switch pipe Q2 is connected to the collector electrode of the 3rd switching tube Q3 successively by the tenth resistance R 10 and the 3rd resistance R 3, the grounded emitter of the 3rd switching tube Q3, the node of the tenth resistance R 10 and the 3rd resistance R 3 is connected to the grid of second switch pipe Q2, the base stage of the 3rd switching tube Q3 is pin 10 by the second I/O end that the 4th resistance R 4 is connected to described single-chip microcomputer U6, and the base stage of the 3rd switching tube Q3 is by the 6th resistance R 6 ground connection.By the 9th resistance R 9 and the 5th resistance R 5 ground connection, the first I/O end that the node of the 9th resistance R 9 and the 5th resistance R 5 is connected to single-chip microcomputer U6 is pin 11 successively in the drain electrode of second switch pipe Q2.Wherein, the 5th resistance R 5 and the 9th resistance R 9 constitute sample circuit; described sample circuit is sampled to the output voltage V CC of switch control module 3 and is obtained a sampled voltage; the first I/O end that the node of this sampled voltage by the 5th resistance R 5 and the 9th resistance R 9 exports single-chip microcomputer U6 to is pin 11; single-chip microcomputer U6 compares the reference voltage of the reference edge of this sampled voltage and the adjustable shunting a reference source of three ends U5; if this sampled voltage is during less than this reference voltage; single-chip microcomputer U6 controls the 3rd switching tube Q3 and ends; thereby cut-off switch control module 3 plays a protective role to DC power supply 101.
Wherein, constant-current driven module 4 comprises first inductance L 1, one group or the many groups LED constant-current circuit that is in parallel, and every group of LED constant-current circuit includes constant-current driven chip and peripheral circuit thereof, and preferably, selecting model for use is the constant-current driven chip of MP2370.
In the present embodiment, comprise that with constant-current driven module 4 first inductance L 1 and three groups of LED constant-current circuits that are in parallel are that example is set forth, as follows:
First group of LED constant-current circuit comprises constant-current driven chip U1, the 15 resistance R 15, the 16 resistance R 16, the 17 resistance R 17, the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 3rd diode D3 and second inductance L 2, the input of described constant-current driven chip U1 is that pin 5 is the drain electrode of second switch pipe Q2 by the output that first inductance L 1 is connected to described switch control module 2, the input that the 16 resistance R 16 is connected to constant-current driven chip U1 is that pin 5 and Enable Pin are between the pin 4, the input that the 5th capacitor C 5 is connected to constant-current driven chip U1 is between pin 5 and the ground, the output of constant-current driven chip U1 is that pin 6 is connected to the anode that first led light source is LIGHT1 by second inductance L 2, the feedback end of constant-current driven chip U1 is that pin 3 is successively by the 15 resistance R 15 and the 17 resistance R 17 ground connection, the node of the 15 resistance R 15 and the 17 resistance R 17 is connected to the negative terminal that first led light source is LIGHT1, the output that the negative pole of the 3rd diode D3 is connected to constant-current driven chip U1 is pin 6, the plus earth of the 3rd diode D3, the output that the 6th capacitor C 6 is connected to constant-current driven chip U1 is that pin 6 and feed end are between the pin 1, and the 7th capacitor C 7 is connected between the anode and ground that first led light source is LIGHT1.
Second group of LED constant-current circuit comprises constant-current driven chip U2, the 15 resistance R 15 ', the 16 resistance R 16 ', the 17 resistance R 17 ', the 5th capacitor C 5 ', the 6th capacitor C 6 ', the 7th capacitor C 7 ', the 3rd diode D3 ' and second inductance L 2 ', the input of described constant-current driven chip U2 is that the input that pin 5 is connected to constant-current driven chip U1 is pin 5, the input that the 16 resistance R 16 ' is connected to constant-current driven chip U2 is that pin 5 and Enable Pin are between the pin 4, the input that the 5th capacitor C 5 ' is connected to constant-current driven chip U2 is between pin 5 and the ground, the output of constant-current driven chip U2 is that pin 6 is connected to the anode that second led light source is LIGHT2 by second inductance L 2 ', the feedback end of constant-current driven chip U2 is that pin 3 is successively by the 15 resistance R 15 ' and the 17 resistance R 17 ' ground connection, the node of the 15 resistance R 15 ' and the 17 resistance R 17 ' is connected to the negative terminal that second led light source is LIGHT2, the output that the negative pole of the 3rd diode D3 ' is connected to constant-current driven chip U2 is pin 6, the plus earth of the 3rd diode D3 ', the output that the 6th capacitor C 6 ' is connected to constant-current driven chip U2 is that pin 6 and feed end are between the pin 1, and the 7th capacitor C 7 ' is connected between the anode and ground that second led light source is LIGHT2.
The 3rd group of LED constant-current circuit comprises constant-current driven chip U3, the 15 resistance R 15 "; the 16 resistance R 16 ", the 17 resistance R 17 "; the 5th capacitor C 5 ", the 6th capacitor C 6 "; the 7th capacitor C 7 ", the 3rd diode D3 " and second inductance L 2 ", the input of described constant-current driven chip U3 is that the input that pin 5 is connected to constant-current driven chip U1 is pin 5, the 16 resistance R 16 " input that is connected to constant-current driven chip U3 is that pin 5 and Enable Pin are between the pin 4; the 5th capacitor C 5 " input that is connected to constant-current driven chip U3 is between pin 5 and the ground, the output of constant-current driven chip U3 is that pin 6 is by second inductance L 2 " be connected to the anode that the 3rd led light source is LIGHT3; the feedback end of constant-current driven chip U3 is that pin 3 is successively by the 15 resistance R 15 " and the 17 resistance R 17 " ground connection; the 15 resistance R 15 " and the 17 resistance R 17 " node be connected to the negative terminal that the 3rd led light source is LIGHT3; the 3rd diode D3 " the negative pole output that is connected to constant-current driven chip U3 be pin 6, the 3rd diode D3 " plus earth; the 6th capacitor C 6 " output that is connected to constant-current driven chip U3 is that pin 6 and feed end are between the pin 1, the 7th capacitor C 7 " be connected between the anode and ground that the 3rd led light source is LIGHT3.
Wherein, brightness regulation module 7 comprises the three group light regulating circuits corresponding with above-mentioned three groups of LED constant-current circuits that are in parallel.
First group of light regulating circuit includes the 18 resistance R 18, the 19 resistance R 19, the 5th diode D5 and the 8th capacitor C 8.The positive pole of the 5th diode D5 is pin 5 by the 5th I/O end that the 18 resistance R 18 and the 19 resistance R 19 are connected to single-chip microcomputer U6, the node of the 18 resistance R 18 and the 19 resistance R 19 is by the 8th capacitor C 8 ground connection, and the feedback end that the negative pole of the 5th diode D5 is connected to the constant-current driven chip U1 of first group of LED constant-current circuit is pin 3.
Second group of light regulating circuit includes the 18 resistance R 18 ', the 19 resistance R 19 ', the 5th diode D5 ' and the 8th capacitor C 8 '.The positive pole of the 5th diode D5 ' is pin 5 by the 5th I/O end that the 18 resistance R 18 ' and the 19 resistance R 19 ' are connected to single-chip microcomputer U6, the node of the 18 resistance R 18 ' and the 19 resistance R 19 ' is by the 8th capacitor C 8 ' ground connection, and the feedback end that the negative pole of the 5th diode D5 ' is connected to the constant-current driven chip U2 of first group of LED constant-current circuit is pin 3.
The 3rd group the light regulating circuit include the 18 resistance R 18 ", the 19 resistance R 19 ", the 5th diode D5 " and the 8th capacitor C 8 ".The 5th diode D5 " positive pole by the 18 resistance R 18 " and the 19 resistance R 19 " the 5th I/O end that is connected to single-chip microcomputer U6 is pin 5; the 18 resistance R 18 " and the 19 resistance R 19 " node by the 8th capacitor C 8 " ground connection, the 5th diode D5 " the negative pole feedback end that is connected to the constant-current driven chip U3 of first group of LED constant-current circuit be pin 3.
Wherein, short-circuit detecting module 8 comprises that with first led light source be that LIGHT1, second led light source are the 4th diode D4, the 4th diode D4 ', the 4th diode D4 that the positive pole of LIGHT2 and the 3rd led light source links to each other respectively ", the 21 resistance R 21, the 22 resistance R 22 and the 23 resistance R 23.The 4th diode D4, the 4th diode D4 ' and the 4th diode D4 " be in parallel; the feeder ear that the positive pole of the 4th diode D4 is connected to single-chip microcomputer U6 by the 23 resistance R 23 and the 22 resistance R 22 successively is that the node of pin 1, the 23 resistance R 23 and the 22 resistance R 22 is pin 3 by the 6th I/O end that the 21 resistance R 21 is connected to described single-chip microcomputer U6.
In addition, Wiring port JP6 is the Wiring port that presets of single-chip microcomputer U6, be used for connecting indicating circuit, the feeder ear that the terminal 1 of Wiring port JP6 is connected to single-chip microcomputer U6 is pin 1, terminal 2 is pin 8 by the 7th I/O end that the 28 resistance is connected to single-chip microcomputer U6, terminal 3 is pin 7 by the 8th I/O end that the 29 resistance is connected to single-chip microcomputer U6, terminal 4 is pin 5 by the 9th I/O end that the 30 resistance is connected to single-chip microcomputer U6, as the terminal 2 at Wiring port JP6, after inserting indicator light on terminal 3 and the terminal 4, can indicate the operating state of this LED control circuit.
The course of work of this LED lamp control circuit is as follows:
First kind: led light source is in and extinguishes state.Specific as follows, the moving contact S0 of control switch K is connected to the first fixed contact S1, and control switch K disconnects, so DC power supply 101 disconnects, led light source is in and extinguishes state, and in this process, micro control module 6 is not worked, and DC power supply 101 need not give micro control module 6 power supplies.
Second kind, led light source is luminous with the high light pattern.Specific as follows, the moving contact S0 of control switch K is connected to the second fixed contact S2, control switch K conducting, do not have electric current to flow through on the first diode D1 this moment, the first diode D1 positive pole is to produce first detection signal on the TEST end, micro control module 6 produces first output voltage according to this first detection signal control switch control module 3, constant-current driven module 4 produces one according to this first output voltage and is used for led light source with first constant current of high light pattern work, so led light source is that LIGHT1, LIGHT2 and LIGHT3 are all luminous with the high light pattern.
The third, led light source is luminous with low light level pattern.Specific as follows, the moving contact S0 of control switch K is connected to the 3rd fixed contact S3, control switch K conducting, have electric current to flow through on the first diode D1 this moment, the first diode D1 positive pole is to produce second detection signal on the TEST end, micro control module 6 produces second output voltage according to this second detection signal control switch control module 3, constant-current driven module 4 produces one according to this second output voltage and is used for led light source with second constant current of low light level pattern work, so led light source is that LIGHT1, LIGHT2 and LIGHT3 are all luminous with low light level pattern.
In above-mentioned second kind and the third course of work, short-circuit detecting module 8 detects the operating current of led light source always, when led light source is when any one operating current is greater than the current threshold that arranges in it among LIGHT1, LIGHT2 and the LIGHT3, with the output short-circuit triggering signal to micro control module 6, the 6th I/O end that is single-chip microcomputer U6 is that the level on the pin 3 becomes low level by high level, so, single-chip microcomputer U6 controls described switch control module 3 and disconnects so that constant-current driven module 4 quits work, in case circuit is caused damage.
Further, in above-mentioned second kind and the third course of work, the 5th I/O end of single-chip microcomputer U6 is that the luminosity that 5 pairs of led light sources of pin are LIGHT1, LIGHT2 and LIGHT3 is regulated simultaneously, namely, be the value of the voltage on the pin 3 by the feed end of regulating constant-current driven chip U1, constant-current driven chip U2 and constant-current driven chip U3 simultaneously, thereby the output that makes constant-current driven chip U1, constant-current driven chip U2 and constant-current driven chip U3 is the size of current of output on the pin 6 to change, thereby the luminosity of led light source is regulated.
Among the present invention, micro control module 6, lowering and stabilizing blood pressure module 5 and constant-current driven module 4 available chip models are not limited to above-mentioned mentioned arriving, and, can select to arrange according to the side circuit demand to the setting of current threshold and voltage threshold.
Compared with prior art, in the LED lamp control circuit of the present invention, when control switch K disconnects, DC power supply 101 disconnects, and led light source will be in and extinguish state, in this process, micro control module 6 is not worked, and DC power supply 101 need not give micro control module 6 power supplies, has saved electric weight.And, in supply module 1, testing circuit produces a detection signal according to the on off state of control switch K, micro control module 6 produces first output voltage or second output voltage according to this detection signal control switch control module 3, constant-current driven module 4 is luminous with high light pattern or low light level pattern according to this first output voltage or second output voltage control led light source, has realized the selection of the light-emitting mode of led light source.
In addition, the output short-circuit triggering signal is to micro control module 6 during greater than the current threshold that arranges in it at the operating current of led light source for short-circuit detecting module 8, and micro control module 6 quits work according to the described short circuit triggering signal control control module 3 of opening the light.Simultaneously, brightness regulation module 7 can be regulated the luminosity of led light source.Simultaneously, anti-reverse module 2 disconnects when DC power supply 101 reversal connections, and DC power supply 101 is shielded.
The invention still further relates to a kind of LED light fixture, it comprises LED control circuit and led light source, described LED control circuit is same as described above, it comprises supply module 1, anti-reverse module 2, switch control module 3, constant-current driven module 4, lowering and stabilizing blood pressure module 5, micro control module 6, brightness regulation module 7 and short-circuit detecting module 8, described supply module 1 comprises DC power supply 101, control switch K and testing circuit 102, described control switch K comprises a moving contact S0, the first fixed contact S1, the second fixed contact S2 and the 3rd fixed contact S3, described testing circuit 102 comprises first resistance R 1, second resistance R 2 and the first diode D1, described moving contact S0 is connected to DC power supply 101, the described first fixed contact S1 is unsettled, the described second fixed contact S2 is connected to the negative pole of the first diode D1, described the 3rd fixed contact S3 is connected to the positive pole of the first diode D1, the positive pole of the first diode D1 is successively by first resistance R 1, second resistance R, 2 ground connection, the positive pole of the first diode D1 is exported a detection signal; Micro control module 6 produces an output voltage according to this detection signal control switch control module 3, and constant-current driven module 4 produces a constant current for described led light source work according to described output voltage.As seen, when control switch K disconnects, led light source will be in and extinguish state, and in this process, micro control module 6 is not worked, and DC power supply 101 need not give micro control module 6 power supplies, has saved electric weight.
The embodiment of this LED control circuit will repeat no more herein.
The above only is embodiments of the invention, not in order to limiting the present invention, all any modifications of doing in the spirit and principles in the present invention, is equal to and replaces or improvement etc., all should be included in protection scope of the present invention.
Claims (8)
1. LED lamp control circuit, link to each other with led light source, it comprises supply module, switch control module, constant-current driven module, lowering and stabilizing blood pressure module and micro control module, described supply module, switch control module and constant-current driven module link to each other successively, described micro control module links to each other with switch control module with supply module, lowering and stabilizing blood pressure module respectively, and described lowering and stabilizing blood pressure module links to each other with supply module; Described supply module comprises DC power supply, it is characterized in that,
Described supply module also comprises control switch and testing circuit, and described control switch is used for the described DC power supply of control to be opened or turn-off, and described testing circuit produces a detection signal by the on off state that detects described control switch;
Described supply module is by being the constant-current driven module power supply behind the described switch control module;
Thereby described lowering and stabilizing blood pressure module is carried out the lowering and stabilizing blood pressure processing for the output voltage to described DC power supply and is described micro control module power supply;
Described micro control module is controlled described switch control module according to this detection signal and is produced first output voltage or second output voltage, described constant-current driven module produces one according to described first output voltage and is used for described led light source with first constant current of high light pattern work, and perhaps described constant-current driven module is used for described led light source with second constant current of low light level pattern work according to described second output voltage generation one;
Described LED lamp control circuit also comprises anti-reverse module, and described anti-reverse module is arranged between described supply module and the switch control module, and described anti-reverse module connects in described DC power supply and controls described supply module and switch control module disconnection inverse time;
Described micro control module comprises single-chip microcomputer;
Described anti-reverse module comprises first switching tube, the 7th resistance and the 8th resistance, the drain electrode of first switching tube is connected to second fixed contact, the source electrode of first switching tube is successively by the 8th resistance and the 7th grounding through resistance, and the grid of first switching tube is by the 7th grounding through resistance;
Described lowering and stabilizing blood pressure module comprises low-dropout regulator, the 11 resistance, first electric capacity and second electric capacity, the input of low-dropout regulator is connected to the source electrode of first switching tube by the 11 resistance, first electric capacity is connected between the source electrode and ground of first switching tube, second electric capacity is connected between the output and ground of low-dropout regulator, and the output of low-dropout regulator is connected to the feeder ear of described single-chip microcomputer;
Described switch control module comprises the second switch pipe, the 3rd switching tube, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 9th resistance and the tenth resistance, the source electrode of second switch pipe is connected to the source electrode of first switching tube, and the source electrode of second switch pipe is connected to the collector electrode of the 3rd switching tube successively by the tenth resistance and the 3rd resistance, the grounded emitter of the 3rd switching tube, the node of the tenth resistance and the 3rd resistance is connected to the grid of second switch pipe, the base stage of the 3rd switching tube by the 4th resistance be connected to described single-chip microcomputer one the input output, and the base stage of the 3rd switching tube is by the 6th grounding through resistance, the drain electrode of second switch pipe is successively by the 9th resistance and the 5th grounding through resistance, the node of the 9th resistance and the 5th resistance be connected to single-chip microcomputer another input output;
Described constant-current driven module comprises first inductance and LED constant-current circuit, described LED constant-current circuit comprises constant-current driven chip, the 15 resistance, the 16 resistance, the 17 resistance, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 3rd diode and second inductance, the input of described constant-current driven chip is connected to the drain electrode of second switch pipe by first inductance, the 16 resistance is connected between the input and Enable Pin of constant-current driven chip, the 5th electric capacity is connected between the input and ground of constant-current driven chip, the output of constant-current driven chip is connected to the anode of led light source by second inductance, the feedback end of constant-current driven chip is successively by the 15 resistance and the 17 grounding through resistance, the node of the 15 resistance and the 17 resistance is connected to the negative terminal of led light source, the negative pole of the 3rd diode is connected to the output of constant-current driven chip, the plus earth of the 3rd diode, the 6th electric capacity is connected between the output and feed end of constant-current driven chip, and the 7th electric capacity is connected between the anode and ground of led light source.
2. LED lamp control circuit according to claim 1 is characterized in that,
Described control switch comprises a moving contact, first fixed contact, second fixed contact and the 3rd fixed contact, and described moving contact is connected to DC power supply, and described first fixed contact is unsettled, and described second fixed contact and the 3rd fixed contact are connected to described testing circuit.
3. LED lamp control circuit according to claim 2 is characterized in that,
Described testing circuit comprises first resistance, second resistance and first diode, the negative pole of first diode is connected to described second fixed contact, the positive pole of first diode is connected to described the 3rd fixed contact, and also successively by first resistance and second grounding through resistance, the positive pole of first diode is exported described detection signal to the positive pole of first diode.
4. LED lamp control circuit according to claim 1 is characterized in that,
Described LED lamp control circuit also comprises the short-circuit detecting module, described short-circuit detecting module links to each other with led light source with micro control module respectively, 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 arranges 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.
5. LED lamp control circuit according to claim 4, it is characterized in that, described micro control module comprises single-chip microcomputer, described short-circuit detecting module comprises the 4th diode, the 21 resistance, the 22 resistance and the 23 resistance, the negative pole of the 4th diode is connected to the positive pole of described led light source, the positive pole of the 4th diode is connected to the feeder ear of described single-chip microcomputer successively by the 23 resistance and the 22 resistance, the node of the 23 resistance and the 22 resistance is connected to an I/O end of described single-chip microcomputer by the 21 resistance.
6. LED lamp control circuit according to claim 1, it is characterized in that, described LED lamp control circuit also comprises the brightness regulation module, described brightness regulation module links to each other with constant-current driven module with micro control module respectively, described micro control module is regulated first constant current of constant-current driven module output or the size of second constant current by the brightness regulation module, to regulate the luminosity of led light source.
7. LED lamp control circuit according to claim 6, it is characterized in that, described micro control module comprises single-chip microcomputer, described constant-current driven module comprises constant-current driven chip, described brightness regulation module comprises the 18 resistance, the 19 resistance, the 5th diode and the 8th electric capacity, the positive pole of the 5th diode is connected to another I/O end of described single-chip microcomputer by the 18 resistance and the 19 resistance, the negative pole of the 5th diode is connected to the feedback end of described constant-current driven chip, and the node of the 18 resistance and the 19 resistance is by the 8th capacity earth.
8. LED light fixture, comprise LED control circuit and led light source, described LED lamp control circuit comprises supply module, switch control module, constant-current driven module, lowering and stabilizing blood pressure module and micro control module, described supply module, switch control module and constant-current driven module link to each other successively, described micro control module links to each other with switch control module with supply module, lowering and stabilizing blood pressure module respectively, and described lowering and stabilizing blood pressure module links to each other with supply module; Described supply module comprises DC power supply, it is characterized in that,
Described supply module also comprises control switch and testing circuit, and described control switch is used for the described DC power supply of control to be opened or turn-off, and described testing circuit produces a detection signal by the on off state that detects described control switch;
Described supply module is by being the constant-current driven module power supply behind the described switch control module;
Thereby described lowering and stabilizing blood pressure module is carried out the lowering and stabilizing blood pressure processing for the output voltage to described DC power supply and is described micro control module power supply;
Described micro control module is controlled described switch control module according to this detection signal and is produced first output voltage or second output voltage, described constant-current driven module produces one according to described first output voltage and is used for described led light source with first constant current of high light pattern work, and perhaps described constant-current driven module is used for described led light source with second constant current of low light level pattern work according to described second output voltage generation one;
Described LED lamp control circuit also comprises anti-reverse module, and described anti-reverse module is arranged between described supply module and the switch control module, and described anti-reverse module connects in described DC power supply and controls described supply module and switch control module disconnection inverse time;
Described micro control module comprises single-chip microcomputer;
Described anti-reverse module comprises first switching tube, the 7th resistance and the 8th resistance, the drain electrode of first switching tube is connected to second fixed contact, the source electrode of first switching tube is successively by the 8th resistance and the 7th grounding through resistance, and the grid of first switching tube is by the 7th grounding through resistance;
Described lowering and stabilizing blood pressure module comprises low-dropout regulator, the 11 resistance, first electric capacity and second electric capacity, the input of low-dropout regulator is connected to the source electrode of first switching tube by the 11 resistance, first electric capacity is connected between the source electrode and ground of first switching tube, second electric capacity is connected between the output and ground of low-dropout regulator, and the output of low-dropout regulator is connected to the feeder ear of described single-chip microcomputer;
Described switch control module comprises the second switch pipe, the 3rd switching tube, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 9th resistance and the tenth resistance, the source electrode of second switch pipe is connected to the source electrode of first switching tube, and the source electrode of second switch pipe is connected to the collector electrode of the 3rd switching tube successively by the tenth resistance and the 3rd resistance, the grounded emitter of the 3rd switching tube, the node of the tenth resistance and the 3rd resistance is connected to the grid of second switch pipe, the base stage of the 3rd switching tube by the 4th resistance be connected to described single-chip microcomputer one the input output, and the base stage of the 3rd switching tube is by the 6th grounding through resistance, the drain electrode of second switch pipe is successively by the 9th resistance and the 5th grounding through resistance, the node of the 9th resistance and the 5th resistance be connected to single-chip microcomputer another input output;
Described constant-current driven module comprises first inductance and LED constant-current circuit, described LED constant-current circuit comprises constant-current driven chip, the 15 resistance, the 16 resistance, the 17 resistance, the 5th electric capacity, the 6th electric capacity, the 7th electric capacity, the 3rd diode and second inductance, the input of described constant-current driven chip is connected to the drain electrode of second switch pipe by first inductance, the 16 resistance is connected between the input and Enable Pin of constant-current driven chip, the 5th electric capacity is connected between the input and ground of constant-current driven chip, the output of constant-current driven chip is connected to the anode of led light source by second inductance, the feedback end of constant-current driven chip is successively by the 15 resistance and the 17 grounding through resistance, the node of the 15 resistance and the 17 resistance is connected to the negative terminal of led light source, the negative pole of the 3rd diode is connected to the output of constant-current driven chip, the plus earth of the 3rd diode, the 6th electric capacity is connected between the output and feed end of constant-current driven chip, and the 7th electric capacity is connected between the anode and ground of led light source.
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