CN101765269B - LED drive circuit - Google Patents

LED drive circuit Download PDF

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Publication number
CN101765269B
CN101765269B CN2009101901112A CN200910190111A CN101765269B CN 101765269 B CN101765269 B CN 101765269B CN 2009101901112 A CN2009101901112 A CN 2009101901112A CN 200910190111 A CN200910190111 A CN 200910190111A CN 101765269 B CN101765269 B CN 101765269B
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China
Prior art keywords
resistance
throw switch
led
drive circuit
voltage
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CN101765269A (en
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周明杰
张成良
寇军飞
廖启博
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The present invention relates to an LED drive circuit which comprises a control module and a drive module. The control module comprises a first resistor, a second resistor, a third resistor, a filter element and a single-pole double-throw switch, wherein the first resistor is connected between the output of the single-pole double-throw switch and ground, the filtering element is connected with both ends of the first resistor in parallel, one end of the second resistor and one end of the third resistor are respectively connected with the second and the third inputs of the single-pole double-throw switch, the other end of the second resistor and the other end of the third resistor are respectively connected with a high power level, and the output of the single-pole double-throw switch is connected with the drive module. The control module can output different voltages to the drive module by toggling the single-pole double-throw switch. When the single-pole double-throw switch is toggled, the voltage of the filtering element hardly changes suddenly, so no impulse interference exists when the voltage output from the control module changes. Therefore, an LED does not twinkle when the current of the drive unit changes, thereby prolonging the service life of the LED.

Description

A kind of led drive circuit
Technical field
The present invention relates to the LED Driving technique, more particularly, relate to a kind of led drive circuit.
Background technology
The adjustable led drive circuit of brightness commonly used is to adopt the switch input control signal to control circuit at present, by the PWM ripple of control circuit output different frequency different duty, realizes the brilliance control of LED.As shown in Figure 1, control module comprises single-pole double-throw switch (SPDT) and single-chip microcomputer, the 1st pin ground connection of single-pole double-throw switch (SPDT), its the 2nd, 3 pin connects high level by resistance R 8, R6 respectively, and its 2nd, 3 pin connects respectively the 5th pin and the 7th pin of single-chip microcomputer, the 6th pin of single-chip microcomputer connects the driving chip of drive part, adjust the brightness of LED by the PWM ripple of the 6th pin output different duty or different frequency, for example when single-pole double-throw switch (SPDT) connects its 2nd pin, single-chip microcomputer the 5th pin detects low level, and its 6th pin just output duty cycle is 90% PWM ripple; When single-pole double-throw switch (SPDT) connect its 3rd pin, single-chip microcomputer the 7th pin detected low level, and its 6th pin just output duty cycle is 40% PWM ripple, had therefore reached the purpose of adjusting LED brightness.But when high-current switch switched, circuit had larger impulsive disturbance, and this moment, LED had Flickering Phenomenon, flashed to pollute the environment, and affected the life-span of LED.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defective that LED can flash when the switching over of prior art, the led drive circuit that LED did not flash when a kind of switching over was provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of led drive circuit, comprise control module and driver module, it is characterized in that, described control module comprises the first resistance, the second resistance, the 3rd resistance, filter element and single-pole double-throw switch (SPDT), described the first resistance is connected between the output terminal and ground of single-pole double-throw switch (SPDT), described filter element is connected in parallel on the two ends of described the first resistance, one end of described the second resistance, one end of described the 3rd resistance connects respectively second of single-pole double-throw switch (SPDT), the 3rd input end, the other end of described the second resistance, the other end of described the 3rd resistance connects respectively high level, the output termination driver module of described single-pole double-throw switch (SPDT), by stirring single-pole double-throw switch (SPDT) so that described control module is adjustable with the brightness that realizes LED to the different voltage of described driver module output.
In led drive circuit of the present invention, described filter element is the first electric capacity.
In led drive circuit of the present invention, also comprise the lowering and stabilizing blood pressure module, described lowering and stabilizing blood pressure module comprises diode rectifier bridge and the voltage stabilizer that connects successively, and described diode rectifier bridge is used for alternating current is converted to direct current, for driver module provides operating voltage; Described voltage stabilizer is used for the output direct current of voltage regulation, and described direct current of voltage regulation provides operating voltage for control module.
In led drive circuit of the present invention, described control module also comprises the low pressure detecting unit, and described low pressure detecting unit is used for the operating voltage signal of sampling driver module, and judges and turn-off driver module when the sampled voltage signal is lower than preset value.
In led drive circuit of the present invention, described low pressure detecting unit comprises single-chip microcomputer, the 4th resistance, the 5th resistance and triode, described the 4th resistance and the series connection of described the 5th resistance, the output head anode of one terminating diode rectifier bridge, other end ground connection, the joint of described the 4th resistance and described the 5th resistance connects the first input end of single-chip microcomputer, the base stage of the first output termination triode of single-chip microcomputer, the grounded emitter of triode, its collector connects driver module.
In led drive circuit of the present invention, described driver module comprises the driving chip, and described driving chip is used for regulating according to the voltage of control module output the electric current of LED.
In led drive circuit of the present invention, the output terminal of described single-pole double-throw switch (SPDT) is connected collector and is connected in the lump the first input end that drives chip with triode.
In led drive circuit of the present invention, described driver module also comprises inductance, fly-wheel diode, the 6th resistance, the 7th resistance, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor, the grid of described the first metal-oxide-semiconductor connects the first output terminal that drives chip, its source ground, its drain electrode connects the negative pole of described LED, the positive pole of described LED continues by the 7th resistance and flows the negative pole of diode, the positive pole of described fly-wheel diode connects the output head anode of diode rectifier bridge by inductance, the grid of described the second metal-oxide-semiconductor connects the second output terminal that drives chip, its source electrode is by described the 6th resistance eutral grounding, its drain electrode connects the positive pole of described fly-wheel diode, and described driving chip is controlled the first metal-oxide-semiconductor according to the input voltage of its first input end, the alternate conduction time of the second metal-oxide-semiconductor is to regulate the electric current of LED.
In led drive circuit of the present invention, also comprise the driving switch that is connected between described diode rectifier bridge output head anode and the described inductance.
In led drive circuit of the present invention, described driving switch and single-pole double-throw switch (SPDT) are integrated into double-point double-throw switch.
Implement led drive circuit of the present invention, make the first resistance respectively when connecting the second resistance or the 3rd resistance by single-pole double-throw switch (SPDT), control module is to the different voltage of driver module output, and when stirring single-pole double-throw switch (SPDT) and since the voltage of the first electric capacity can not suddenly change so that the voltage of control module output is when changing, can not produce impulsive disturbance, therefore the electric current of drive part is when changing, and LED can not produce Flickering Phenomenon, has improved the life-span of LED.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit diagram of prior art;
Fig. 2 is the schematic diagram of led drive circuit embodiment one of the present invention;
Fig. 3 is the corresponding circuit diagram of Fig. 2.
Embodiment
As shown in Figure 2, in the schematic diagram of led drive circuit embodiment one of the present invention, this circuit comprises control module 100, driver module 200 and lowering and stabilizing blood pressure module 300, wherein, lowering and stabilizing blood pressure module 300 is used to control module 100 and driver module 200 that operating voltage is provided, driver module 200 comes the different electric current of regulation output adjustable with the brightness that realizes LED according to the different voltages of control module 100 outputs, control module 100 also comprises the low pressure detecting unit, the operating voltage that is used for sampling driver module 200, and judge and when sampling work voltage is lower than preset value, turn-off driver module 200.
In the circuit diagram of the led drive circuit embodiment one of the present invention shown in Fig. 3, this circuit comprises control module 100, driver module 200 and lowering and stabilizing blood pressure module 300, wherein control module 100 also comprises low pressure detecting unit 110, and the below is elaborated sub-module respectively to each several part.
Lowering and stabilizing blood pressure module 300 is link control module 100 and driver module 200 simultaneously, is used to control module 100 and driver module 200 that operating voltage is provided.In Fig. 3, the two ends of electric main connect respectively the input end two ends of diode rectifier bridge D1 by inductance L 1, L2, and capacitor C 1 is connected in parallel on the input end two ends of diode rectifier bridge D1, and inductance L 1, L2, capacitor C 1 are used for electric main is carried out filtering.Filtered electric main is converted to direct current behind diode rectifier bridge D1, direct current is divided into two-way, and one the tunnel is driver module 200 power supplies, and another road is control module 100 power supplies after voltage stabilizing.Capacitor C 2, C3 are connected in parallel on respectively the output terminal two ends of diode rectifier bridge D1, the negative pole of output end ground connection of diode rectifier bridge D1, its output head anode is leaded up to resistance R 5 and is connect the 1st pin (Vin) of voltage stabilizer U1, another road connects driver module 200 through driving switch S1-1, the 2nd pin (GND) ground connection of voltage stabilizer U1, its the 3rd pin (Vout) connects control module 100, and capacitor C 5, C6 are connected in parallel between the 3rd pin (Vout) and the 2nd pin (GND) of voltage stabilizer U1.
Control module 100 comprises resistance R 9, R10, R11, single-pole double-throw switch (SPDT) S1-2, capacitor C 9, and wherein, single-pole double-throw switch (SPDT) S1-2 and driving switch S1-1 are integrated into double-point double-throw switch.As shown in Figure 3, resistance R 10 is connected between the 1st pin and ground of single-pole double-throw switch (SPDT) S1-2, the 3rd pin (Vout) of resistance R 9 one termination voltage stabilizer U1, the 2nd pin of other end order double-pole double throw switch S1-2, the 3rd pin (Vout) of resistance R 11 1 termination voltage stabilizer U1, the 3rd pin of other end order double-pole double throw switch S1-2, capacitor C 9 is connected in parallel on the two ends of resistance R 10, and the 1st pin of single-pole double-throw switch (SPDT) connects driver module.Stir single-pole double-throw switch (SPDT), make the 1st pin (output terminal) of single-pole double-throw switch (SPDT) S1-2 be communicated with respectively its 2nd pin (first input end) or the 3rd pin (the second input end), be that resistance R 10 is communicated with resistance R 9 or resistance R 11 respectively, because resistance R 9, the resistance of R11 is different, therefore, so that the 1st pin of single-pole double-throw switch (SPDT) S1-2 is when being communicated with respectively its 2nd pin or the 3rd pin, the voltage at resistance R 10 two ends is different, thereby reach the purpose of regulating the different constant current values of LED by to the different voltages of driver module 200 outputs, in addition, when the voltage transformation at resistance R 10 two ends, because the voltage at capacitor C 9 two ends can not suddenly change, so so that the voltage of exporting to driver module 200 can not produce impulsive disturbance, and then LED can not produce Flickering Phenomenon.
Need to prove that capacitor C 9 is not limited to the present invention, any element with filter function all can be used for the present invention.
Control module 100 also comprises low pressure detecting unit 110, and low pressure detecting unit 110 comprises single-chip microcomputer U2, resistance R 1, R2, R7, triode Q1.Wherein, the 3rd pin (Vout) of voltage stabilizer U1 connects the 8th pin (Vcc) of single-chip microcomputer, resistance R 1, R2 series connection, one terminating diode rectification bridge output end is anodal, other end ground connection, the joint of resistance R 1, R2 connect the 3rd pin (PB4) of single-chip microcomputer U2, and the 6th pin (PB1) of single-chip microcomputer U2 connects the base stage of triode Q1 by resistance R 7, the grounded emitter of triode Q1, the 1st pin of its collector order double-pole double throw switch S1-2.When the supply voltage of driver module 200 is crossed when low, the output end voltage that is diode rectifier bridge D1 is excessively low, so that the brownout at resistance R 1 two ends, when the voltage that the 3rd pin (PB4) of single-chip microcomputer U2 detects input is lower than a preset value, then its 6th pin (PB1) is exported high level, triode Q1 conducting, so that its collector voltage is zero, therefore, control module 100 is zero to driver module 200 output voltages, thereby turn-off driver module 200, reach when the supply voltage of driver module and cross when low, close the purpose of LED.
Driver module 200 comprises driving chip U3, LED, inductance L 3, voltage stabilizing diode D3, resistance R 18, R28, R24, R25, metal-oxide-semiconductor Q2, Q3, driving the preferred model of chip U3 is the integrated chip of LT3755, drive the 16th pin (first input end CTRL) of chip U3 by the 1st pin of resistance R 18 order double-pole double throw switches, the output head anode of diode rectifier bridge D1 is by driving switch S1-1, inductance L 3 connects the positive pole of voltage stabilizing diode D3, the negative pole of voltage stabilizing diode D3 connects the positive pole of LED by resistance R 28, the negative pole of LED connects the drain electrode of metal-oxide-semiconductor Q3, the source ground of metal-oxide-semiconductor Q3, its grid connects the 11st pin (PWMOUT) that drives chip U3 by resistance R 24, namely the first output terminal drives the 10th pin (GATE) of chip U3, the i.e. grid of the second output termination metal-oxide-semiconductor Q2, the source electrode of metal-oxide-semiconductor Q2 is by resistance R 25 ground connection, and its drain electrode connects the positive pole of voltage stabilizing diode D3.Drive chip U3 and be according to the voltage of its 16th pin input and control its 11st pin (PWMOUT) and its 10th pin (GATE) is alternately exported the time of high level to reach the purpose of adjusting LED electric current, in this definition: when the 11st pin output high level of control chip U3, metal-oxide-semiconductor Q3 conducting, the direct current of diode rectifier bridge D1 output flows to the earth through inductance L 3, voltage stabilizing diode D3, resistance R 28, LED, metal-oxide-semiconductor Q3, and this loop is major loop; When the 10th pin of control chip U3 is exported high level, metal-oxide-semiconductor Q2 conducting, the direct current of diode rectifier bridge D1 output flows to the earth through inductance L 3, metal-oxide-semiconductor Q3, resistance R 25, and this loop is minor loop.
The below illustrates that with an object lesson control chip is brightness how to regulate LED, if the voltage of electric main 300 outputs after the lowering and stabilizing blood pressure module is 5V, the resistance of resistance R 9 is 2K Ω, resistance R 11 is 6K Ω, the resistance of resistance R 10 is 2K Ω, when single-pole double-throw switch (SPDT) S1-2 toggles it to 2 position, the input voltage of the 16th pin of control chip U3 is 2.5V, at this moment, control chip U3 then controls its 11st pin (PWMOUT) and its 10th pin (GATE) is alternately exported high level, so that metal-oxide-semiconductor Q2, the Q3 alternate conduction, and the ON time of metal-oxide-semiconductor Q3 accounts for 80% in the one-period, and LED sends high light; When single-pole double-throw switch (SPDT) S1-2 toggles it to 3 position, the input voltage of the 16th pin of control chip U3 is 1.25V, at this moment, control chip U3 then controls its 11st pin (PWMOUT) and its 10th pin (GATE) is alternately exported high level, so that metal-oxide-semiconductor Q2, Q3 alternate conduction, and the ON time of metal-oxide-semiconductor Q3 accounts for 50% in the one-period, and LED sends the low light level.
The 1st pin (VREF) of control chip U3 can be regulated the reference voltage of control chip by resistance R 14, the R15 ground connection of two series connection by the resistance value of regulating R14, R15.The 12nd pin (FB) of control chip U3 connects the negative pole of voltage stabilizing diode D3 by resistance R 27, its the 13rd pin (ISN) connects the positive pole of LED, its the 14th pin (ISP) connects the negative pole of voltage stabilizing diode D3, and the 12nd, 13,14 pin of control chip U3 are used for the voltage of sampling LED.The 9th pin (SENSE) of control chip connects the source electrode of metal-oxide-semiconductor Q2, is used for the electric current of sampling minor loop.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.

Claims (10)

1. led drive circuit, comprise control module (100) and driver module (200), it is characterized in that, described control module (100) comprises the first resistance (R10), the second resistance (R9), the 3rd resistance (R11), filter element and single-pole double-throw switch (SPDT) (S1-2), described the first resistance (R10) is connected between the output terminal and ground of single-pole double-throw switch (SPDT) (S1-2), described filter element is connected in parallel on the two ends of described the first resistance (R10), one end of described the second resistance (R9), one end of described the 3rd resistance (R11) connects respectively second of single-pole double-throw switch (SPDT) (S1-2), the 3rd input end, the other end of described the second resistance (R9), the other end of described the 3rd resistance (R11) connects respectively high level, the output termination driver module (200) of described single-pole double-throw switch (SPDT) (S1-2), by stirring single-pole double-throw switch (SPDT) (S1-2) so that described control module (100) is adjustable with the brightness that realizes LED to the different voltage of described driver module (200) output.
2. led drive circuit according to claim 1 is characterized in that, described filter element is the first electric capacity (C9).
3. led drive circuit according to claim 1, it is characterized in that, also comprise lowering and stabilizing blood pressure module (300), described lowering and stabilizing blood pressure module (300) comprises diode rectifier bridge (D1) and the voltage stabilizer (U1) that connects successively, described diode rectifier bridge (D1) is used for alternating current is converted to direct current, for driver module (200) provides operating voltage; Described voltage stabilizer (U1) is used for the output direct current of voltage regulation, and described direct current of voltage regulation is that control module (100) provides operating voltage.
4. led drive circuit according to claim 3, it is characterized in that, described control module (100) also comprises low pressure detecting unit (110), described low pressure detecting unit (110) is used for the operating voltage signal of sampling driver module (200), and judges and turn-off driver module (200) when the sampled voltage signal is lower than preset value.
5. led drive circuit according to claim 4, it is characterized in that, described low pressure detecting unit (110) comprises single-chip microcomputer (U2), the 4th resistance (R1), the 5th resistance (R2) and triode (Q1), described the 4th resistance (R1) and described the 5th resistance (R2) series connection, the output head anode of one terminating diode rectifier bridge (D1), other end ground connection, the joint of described the 4th resistance (R1) and described the 5th resistance (R2) connects the first input end of single-chip microcomputer (U2), the base stage of the first output termination triode (Q1) of single-chip microcomputer (U2), the grounded emitter of triode (Q1), its collector connect driver module (200).
6. led drive circuit according to claim 5 is characterized in that, described driver module (200) comprises driving chip (U3), and described driving chip (U3) is used for regulating according to the voltage of control module (100) output the electric current of LED.
7. led drive circuit according to claim 6 is characterized in that, the output terminal of described single-pole double-throw switch (SPDT) (S1-2) is connected Q1 with triode) collector connect in the lump the first input end that drives chip (U3).
8. led drive circuit according to claim 7, it is characterized in that, described driver module (200) also comprises inductance (L3), fly-wheel diode (D3), the 6th resistance (R25), the 7th resistance (R28), the first metal-oxide-semiconductor (Q3) and the second metal-oxide-semiconductor (Q2), the grid of described the first metal-oxide-semiconductor (Q3) connects the first output terminal that drives chip (U3), its source ground, its drain electrode connects the negative pole of described LED, the positive pole of described LED continues by the 7th resistance (R28) and flows the negative pole of diode (D3), the positive pole of described fly-wheel diode (D3) connects the output head anode of diode rectifier bridge (D1) by inductance (L3), the grid of described the second metal-oxide-semiconductor (Q2) connects the second output terminal that drives chip (U3), its source electrode is by described the 6th resistance (R25) ground connection, its drain electrode connects the positive pole of described fly-wheel diode (D3), and described driving chip (U3) is controlled the first metal-oxide-semiconductor (Q3) according to the input voltage of its first input end, the alternate conduction time of the second metal-oxide-semiconductor (Q2) is to regulate the electric current of LED.
9. led drive circuit according to claim 8 is characterized in that, also comprises the driving switch (S1-1) that is connected between described diode rectifier bridge (D1) output head anode and the described inductance (L3).
10. led drive circuit according to claim 9 is characterized in that, described driving switch (S1-1) and single-pole double-throw switch (SPDT) (S1-2) are integrated into double-point double-throw switch.
CN2009101901112A 2009-09-07 2009-09-07 LED drive circuit Active CN101765269B (en)

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CN102811530A (en) * 2011-06-02 2012-12-05 海洋王照明科技股份有限公司 Voltage-rising type LED driving circuit and lamp
CN105978338B (en) * 2016-06-27 2020-09-04 湖南正申科技有限公司 Micropower direct-current low-voltage input direct-current high-voltage generator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101197108A (en) * 2006-12-08 2008-06-11 鸿富锦精密工业（深圳）有限公司 LED control circuit
CN101203081A (en) * 2007-10-22 2008-06-18 深圳市众明半导体照明有限公司 Supply apparatus for light modulation of LED

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101197108A (en) * 2006-12-08 2008-06-11 鸿富锦精密工业（深圳）有限公司 LED control circuit
CN101203081A (en) * 2007-10-22 2008-06-18 深圳市众明半导体照明有限公司 Supply apparatus for light modulation of LED

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