CN101883453B - LED constant current drive circuit - Google Patents
LED constant current drive circuit Download PDFInfo
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- CN101883453B CN101883453B CN2009101070617A CN200910107061A CN101883453B CN 101883453 B CN101883453 B CN 101883453B CN 2009101070617 A CN2009101070617 A CN 2009101070617A CN 200910107061 A CN200910107061 A CN 200910107061A CN 101883453 B CN101883453 B CN 101883453B
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Abstract
The invention relates to an LED constant current drive circuit, which comprises a rectifying circuit, at least one LED light-emitting circuit and at least one constant current circuit connected with the at least one LED light-emitting circuit, wherein the rectifying circuit is used for providing a direct current power supply for the at least one LED light-emitting circuit and the at least one constant current circuit; the at least one constant current circuit is used for providing constant current for the at least one LED light-emitting circuit; the LED constant current drive circuit also comprises a control circuit; and the control circuit can be used for adjusting the at least one constant current circuit by changing the output voltage to output different constant currents. By using the LED constant current drive circuit provided by the invention, the brightness adjustability of the LED lamp can be conveniently realized.
Description
Technical field
The present invention relates to the LED Driving technique, be specifically related to the adjustable LED constant-current drive circuit of a kind of brightness.
Background technology
LED (light-emitting diode) lamp illumination is energy-efficient, environment friendly and pollution-free with it, good visual effect, long-life, progressively replacing the traditional lighting mode without plurality of advantages such as stroboscopics.General LED light fixture is that a lot of LED lamps are concentrated in together, make the style close with conventional lamp, the LED lamp is high owing to possessing luminance, the characteristics such as spectral distribution is even, energy-efficient, the life-span is long, low pressure is controlled are widely used in the indoor and outdoor lighting lamp of urban afforestation illumination, Colour lamp for fastival and holiday, mine lamp, flashlight, motor vehicle.But the brightness of LED light fixture and easy adjusting unlike ordinary incandescent lamp, LED brightness is adjustable to be the problem that present people thirst for solving always.
Summary of the invention
Technical problem to be solved by this invention is: for the nonadjustable defective of prior art LED brightness, provide a kind of brightness adjustable led drive circuit.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of LED constant-current drive circuit, comprise rectification circuit, at least one LED illuminating circuit and at least one constant-current circuit that is connected with described at least one LED illuminating circuit, described rectification circuit is used to described at least one LED illuminating circuit and described at least one constant-current circuit that DC power supply is provided, described at least one constant-current circuit provides constant electric current for described at least one LED illuminating circuit, and described LED constant-current drive circuit also comprises: control circuit; Described control circuit is by the different constant current of described at least one the constant-current circuit output of the voltage-regulation that changes output.
In LED constant-current drive circuit of the present invention, described control circuit comprises the first resistance and the second resistance; Described the second resistance is connected with described the first resistance, an end ground connection, and another termination high level, the joint of described the first resistance, the second resistance connects described at least one constant-current circuit; Described the first resistance and described the second resistance are adjustable.
In LED constant-current drive circuit of the present invention, described control circuit comprises: single-chip microcomputer, three throw switches; The 1st pin ground connection of described three throw switches, the 2nd pin, the 3rd pin are connected with pin with the pin 5 of described single-chip microcomputer respectively and are connected, and the pin 6 of described single-chip microcomputer is connected with described at least one constant-current circuit.
In LED constant-current drive circuit of the present invention, also comprise being connected to the front power control switch of rectification circuit.
In LED constant-current drive circuit of the present invention, described three throw switches and power control switch form the DPTT double-pole triple throw switch.
In LED constant-current drive circuit of the present invention, described at least one constant-current circuit comprises control chip and sampling resistor, described control chip pin 1 connects the LED illuminating circuit, its pin 3 connection control circuits, its pin 5 connects the rectification circuit output end positive pole, and its pin 4 connects described control chip pin 5 by sampling resistor.
In LED constant-current drive circuit of the present invention, also comprise, be connected to the decompression voltage regulator between described rectification circuit and the described control circuit, described decompression voltage regulator is used to control circuit that operating voltage is provided.
In LED constant-current drive circuit of the present invention, also comprise, be connected to the filter between described mains switch and the rectification circuit, the safety electric capacity that described filter is connected on respectively the common mode inductance of rectification circuit two input ports by two and is connected to described common mode inductance two outputs forms.
In LED constant-current drive circuit of the present invention, the control chip of described constant-current circuit is that model is the integrated circuit (IC) chip of ZXLD1362.
Implement LED constant-current drive circuit of the present invention, have the following advantages:
1. change the constant current value of constant-current circuit output by changing the control circuit output voltage values, thereby the brightness that realizes the LED lamp is adjustable;
2. mains switch can prevent battery discharge after closing LED control electric current, the electric leakage problem in the control circuit effectively, the life-span of improving battery;
3.L1, the filter that forms of L2, C1 plays the conducted interference that produces when suppressing circuit working.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is LED constant-current drive circuit theory diagram of the present invention;
Fig. 2 is the principle schematic of LED constant-current drive circuit the first embodiment of the present invention;
Fig. 3 is the control circuit circuit diagram of LED constant-current drive circuit the first embodiment of the present invention;
Fig. 4 is the circuit theory schematic diagram of LED constant-current drive circuit the second embodiment of the present invention.
Embodiment
Show the theory diagram of LED constant-current drive circuit of the present invention such as Fig. 1, the LED constant-current drive circuit comprises rectification circuit 100, decompression voltage regulator 200, constant-current circuit 300, control circuit 400 and LED illuminating circuit 500, wherein,
Rectification circuit 100, be used for will input alternating current be converted to direct current, for LED illuminating circuit and constant-current circuit provide operating voltage;
Constant-current circuit 300 is used to the LED illuminating circuit that constant electric current is provided;
Control circuit 400 is used for coming the different constant current value of regulating constant current circuit output by exporting different voltage;
Decompression voltage regulator 200 is used for the high voltage direct current of described rectification circuit conversion is converted to the direct current of 5v, for control circuit provides operating voltage.
High Level AC Voltage is converted to direct current behind rectification circuit 100, one the tunnel is used for driving LED illuminating circuit 500 and constant-current circuit 300, another road is by decompression voltage regulator 200 rear drive control circuits 400, control circuit 400 comes the different constant current value of regulating constant current circuit 300 outputs by exporting different magnitudes of voltage, LED illuminating circuit 500 sends the light of varying strength according to the different constant current values of constant-current circuit output, thereby the brightness that realizes the LED lamp is adjustable.
Fig. 2 is the technical scheme of embodiment one correspondence, Fig. 4 is the technical scheme of embodiment two correspondences, in embodiment one and embodiment two, with two LED illuminating circuits 510,520, and two constant-current circuits 310 corresponding with it, 320 describe for example, but the present invention is not limited only to two LED illuminating circuits, wherein, in Fig. 2 and Fig. 4, rectification circuit 100, decompression voltage regulator 200, constant-current circuit 300 (310,320), LED illuminating circuit 500 (510,520) identical, control circuit 400 is once described at this, describe in detail respectively among 400 ' below embodiment.
1. rectification circuit
Rectification circuit 100 main realizations are converted to high voltage direct current to the High Level AC Voltage of input, rectification circuit comprises that mains switch S2, filter and rectifier bridge D1 are composed in series, the safety capacitor C 1 that described filter is connected on respectively common mode inductance L1, the L2 of rectification circuit two input ports by two and is connected to two common mode inductance L1, L2 output forms, and this filter plays the conducted interference that produces when suppressing circuit working; Mains switch S2 can prevent battery discharge after closing LED control electric current, the electric leakage problem in the control circuit effectively, the life-span of improving battery.Alternating current obtains direct current after pass a bridge heap D1 and capacitor C 5 rectifications, this direct current separates two-way, and one the tunnel directly supplies with continuous current 300; Another road is through supply control circuit 400 behind the decompression voltage regulator.
2. decompression voltage regulator
Decompression voltage regulator 200 comprises filter capacitor C6, C8, voltage-stabiliser tube U1 and resistance R 1; The pin 2 of voltage-stabiliser tube U1 is connected and ground connection with the negative pole of output end end of the bridge of rectification circuit heap D1, the output head anode end of bridge heap D1 is connected with the pin 1 of voltage-stabiliser tube U1 through resistance R 1, resistance R 1 is used for pressure limiting, pressure stabilization function by voltage-stabiliser tube U1, make the current potential on the pin 3 of voltage-stabiliser tube U1 be stabilized in 5V, described filter capacitor C6 and C8 are connected in parallel between the pin 2 of the pin 3 of voltage-stabiliser tube U1 and voltage-stabiliser tube U1 and ground connection, and filter capacitor C6 and C8 are mainly used in filtering through the galvanic ripple of gained after the bridge heap D1 rectification of rectification circuit.
3. control circuit
In the embodiment of the invention one, as shown in Figure 2, control circuit 400 is: a high level is connected with constant-current circuit 310,320 by two series resistances respectively, and wherein, high level can be the output voltage of decompression voltage regulator.Describe as an example of the control circuit of constant-current circuit 310 correspondences example at this, the control circuit of constant-current circuit 320 correspondences is identical therewith, does not do at this and gives unnecessary details.Resistance R 7 and capacitor C 10 rear end ground connection in parallel, a terminating resistor R6, another termination high level of resistance R 6, the joint of resistance R 6, R7 connects constant-current circuit 310.Adjust the voltage of the upper pin 3 of control chip U3 of constant-current circuit 310 by the ratio of adjusting resistance R7 and R6, realize the effect of control constant current.
Take constant-current circuit 310 as example, the DC voltage control signal of the control chip U3 of constant-current circuit 310 changes according to following formula:
U
3in＝U
2out*R7/(R6+R7)
Wherein, U
3inInput voltage for the control chip pin 3 of constant-current circuit
U
2outOutput voltage (5V) for single-chip microcomputer U2 pin 6
For example, the resistance value of adjusting R7 is 10k ' Ω, and the resistance of R6 is 30 ' Ω, and the input voltage that can obtain the control chip pin 3 of constant-current circuit is 1.25v.
Preferably, the adjustment of R6, R7 resistivity can select adjustable slide rheostat to realize.As shown in Figure 3, a termination high level (5v) of adjustable slide rheostat or the output voltage of decompression voltage regulator, other end ground connection, the pin 3 of middle adjustable termination constant-current circuit 310 control chip U3.
In addition, as another embodiment of the present invention, such as Fig. 4, control circuit 400 ' by single-chip microcomputer U2, three throw switch S1, on draw capacitor C 7, C9 and pull-up resistor R4, R5 to form.Wherein, pin 4 ground connection of single-chip microcomputer, pin 8 meets power supply VCC and namely is connected with the pin 3 of voltage-stabiliser tube U1 in the decompression voltage regulator 200, and the pin 5 of single-chip microcomputer connects the pin 2 of three throw switch S1, and the pin 7 of single-chip microcomputer connects the pin 3 of three throw switch S1; Pull-up resistor R4 with on draw place branch road and pull-up resistor R5 after capacitor C 7 serial connection with on draw the rear place of capacitor C 9 serial connections branch circuit parallel connection to be connected a joint be connected with the pin 8 of single-chip microcomputer, another interaction point is connected also ground connection with the pin 1 of three throw switch S1.
Single-chip microcomputer U2 comes pin 6 is exported the voltage square wave of different duty by the judgement to input pin 5,7 high-low levels.Concrete as, the pin 1 of three throw switch S1,2 connects, pin 5 (PB0) ground connection is low level, pin 7 (PB2) is unsettled be high level, the high level of amplitude is expired in Single-chip Controlling pin 6 (PB1) output, namely duty ratio is 100%; The pin 1 of three throw switch S1,3 connects, and pin 5 (PB0) is unsettled to be high level, and pin 7 (PB2) ground connection is low level, and Single-chip Controlling pin 6 (PB1) output duty cycle is 50% voltage square wave.The voltage square wave of single-chip microcomputer U2 pin 6 output different duty is adjusted the different reference voltages of constant-current circuit, the different continuous current of control constant-current circuit output.
4. constant-current circuit
Described constant-current circuit 300 is used for realizing the function of constant-current driving LED, now describes as an example of constant-current circuit 310 example:
Constant-current circuit 310 comprises sampling resistor, control chip U3 and filter capacitor C14, sampling resistor is resistance R 2 and resistance R 3 in parallel, resistance R 2 are connected with resistance R in parallel after an end be connected with the rectification circuit output end positive pole, the other end is connected with the voltage input pin 4 of control chip U3, and by capacitor C 14 ground connection, capacitor C 14 is used for filtering control voltage ripple; Voltage in sampling resistor R2, R3 intercepting rectification circuit output end cathode voltage and the control chip U3 compares, and the comparative result by between the two, control rectification circuit output end electric current be constant current.
Control chip U3 pin 5 connects the rectification circuit output end positive pole, pin 4 links to each other with pin 5 by sampling resistor, pin 2 ground connection, pin 3 connection control circuits, adjusting pin 3 and applying voltage square wave or the DC voltage control signal of different duty by control circuit, but the just different constant current of regulation output of pin 1.
Preferably, control chip U3 chip uses the chip of ZXLD1362 model.
5.LED illuminating circuit
As shown in Figure 4, now describe as an example of LED illuminating circuit 510 example: LED illuminating circuit 510 comprises luminous LED string LED1, filter circuit and discharge circuit, discharge circuit is formed by inductance L 3 and Schottky diode D2 serial connection, and described inductance L 3 one ends are connected with LED light strings LED1, the other end is connected with the positive pole of Schottky diode D2, and inductance L 3 is connected joint and is connected with the pin 1 of control chip U3 with diode D2, the negative pole of diode D2 is connected with the pin 5 of control chip U3; Filter circuit is comprised of capacitor C 2, C3 and the C4 of mutual serial connection, and its two ends are ground connection respectively, and two middle joints connect respectively the two ends of LED light strings LED1, and filter circuit plays the ripple that LED1 electric current in the rectification circuit output end load is flow through in filtering.
When the electric current of constant-current circuit control chip U3 output was low level, rectification circuit output end was anodal by sampling resistor driving LED string LED1, and electric current is through inductance L 3 ramp metering chip U3; When the electric current of constant-current circuit control chip U3 output was high level, by sampling resistor driving LED string LED1, electric current flowed into the supply voltage cathode output end through inductance L 3, Schottky diode D2 to supply voltage through output cathode.
Because the quality of the performance of Schottky diode D2 and inductance L 1 will affect the stability of numerical value and the circuit of continuous current, and the operating voltage pressure reduction of this circuit larger (being about 25V), require constant current ratio greatly (being about 700mA); Therefore wanting Schottky diode D2 to adopt pressure reduction is the Schottky diode of 60V, 3 of inductance L adopt wire diameter thicker, are used for bearing great current.
Claims (5)
1. LED constant-current drive circuit, comprise rectification circuit, at least one LED illuminating circuit and at least one constant-current circuit that is connected with described at least one LED illuminating circuit, described rectification circuit is used to described at least one LED illuminating circuit and described at least one constant-current circuit that DC power supply is provided, described at least one constant-current circuit provides constant electric current for described at least one LED illuminating circuit, it is characterized in that, described LED constant-current drive circuit also comprises: control circuit;
Described control circuit is by the different constant current of described at least one the constant-current circuit output of the voltage-regulation that changes output;
Described LED constant-current drive circuit also comprises: be connected to the decompression voltage regulator between described rectification circuit and the described control circuit;
Described at least one constant-current circuit comprises control chip and sampling resistor, and described control chip pin 1 connects the LED illuminating circuit, its pin 3 connection control circuits, and its pin 5 connects the rectification circuit output end positive pole, and its pin 4 connects described control chip pin 5 by sampling resistor; The control chip of described constant-current circuit is that model is the integrated circuit (IC) chip of ZXLD1362;
Described control circuit comprises adjustable slide rheostat, the output voltage of one termination decompression voltage regulator of described adjustable slide rheostat, the other end ground connection of described adjustable slide rheostat, the pin 3 of the control chip of the centre of described adjustable slide rheostat the is adjustable described constant-current circuit of termination.
2. LED constant-current drive circuit according to claim 1 is characterized in that, described control circuit comprises: single-chip microcomputer (U2), three throw switches (S1); The 1st pin ground connection of described three throw switches (S1), the 2nd pin, the 3rd pin are connected with pin with the pin 5 of described single-chip microcomputer (U2) respectively and are connected, and the pin 6 of described single-chip microcomputer (U2) is connected with described at least one constant-current circuit.
3. LED constant-current drive circuit according to claim 2 is characterized in that, also comprises being connected to the front power control switch (S2) of rectification circuit.
4. LED constant-current drive circuit according to claim 3 is characterized in that, described three throw switches (S1) form the DPTT double-pole triple throw switch with power control switch (S2).
5. LED constant-current drive circuit according to claim 4, it is characterized in that, also comprise, be connected to the filter between described mains switch (S2) and the rectification circuit, the safety electric capacity (C1) that described filter is connected on respectively the common mode inductance (L1, L2) of rectification circuit two input ports by two and is connected to described common mode inductance (L1, L2) two outputs forms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009101070617A CN101883453B (en) | 2009-05-05 | 2009-05-05 | LED constant current drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101070617A CN101883453B (en) | 2009-05-05 | 2009-05-05 | LED constant current drive circuit |
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| CN101883453A CN101883453A (en) | 2010-11-10 |
| CN101883453B true CN101883453B (en) | 2013-03-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102469651B (en) * | 2010-11-11 | 2014-01-15 | 海洋王照明科技股份有限公司 | LED drive circuit and light fixture |
| CN102480819A (en) * | 2010-11-24 | 2012-05-30 | 海洋王照明科技股份有限公司 | LED driving circuit |
| CN102573181A (en) * | 2010-12-17 | 2012-07-11 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| CN102811531A (en) * | 2011-06-02 | 2012-12-05 | 海洋王照明科技股份有限公司 | Step-down LED driving circuit and lamp |
| US8414160B2 (en) * | 2011-06-13 | 2013-04-09 | Tsmc Solid State Lighting Ltd. | LED lamp and method of making the same |
| CN102355762B (en) * | 2011-06-18 | 2014-02-19 | 光宝电子(广州)有限公司 | LED light automation positioning synchronization method and apparatus thereof |
| CN102573225A (en) * | 2011-12-23 | 2012-07-11 | 东莞市亿凌电子有限公司 | LED lamp and power supply module thereof |
| CN102711329B (en) * | 2012-05-31 | 2014-07-09 | 宁波福泰电器有限公司 | Self-adaptive LED (light emitting diode) fluorescent lamp |
| WO2017035721A1 (en) * | 2015-08-31 | 2017-03-09 | 深圳市宝瑞恒业科技有限公司 | Compatible led tube lamp having current leakage protection function |
| CN105657891B (en) * | 2015-12-31 | 2018-05-18 | 广州达森灯光股份有限公司 | A kind of LED drive power circuit |
| CN108167779B (en) * | 2017-12-15 | 2020-03-27 | 宁波凯耀电器制造有限公司 | High-precision light control method of LED lamp |
| CN109373215A (en) * | 2018-11-26 | 2019-02-22 | 安徽芯瑞达科技股份有限公司 | A kind of ultra-high brightness LED glass fluorescent lamp |
| CN109506140A (en) * | 2018-11-26 | 2019-03-22 | 安徽芯瑞达科技股份有限公司 | A kind of ultra-high brightness LED bulb lamp |
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| CN201028439Y (en) * | 2007-01-12 | 2008-02-27 | 吴富昌 | Brightness-adjustable lamp bead |
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