CN201001216Y - High power LED drive circuit - Google Patents
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- CN201001216Y CN201001216Y CNU2007201182337U CN200720118233U CN201001216Y CN 201001216 Y CN201001216 Y CN 201001216Y CN U2007201182337 U CNU2007201182337 U CN U2007201182337U CN 200720118233 U CN200720118233 U CN 200720118233U CN 201001216 Y CN201001216 Y CN 201001216Y
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Abstract
The utility model discloses a high-power LED drive circuit, which comprises a rectifying circuit, a switch tube, a high-frequency voltage transformation/rectifying circuit, a PWM control chip and a photocoupler feed back circuit, the PWM control chip accepts the feed back of the photocoupler feed back circuit and controls the operating of the whole LED drive circuit; and also comprises an output current detecting circuit, wherein the output current detecting circuit is connected with the output end of the high-frequency voltage transformation/rectifying circuit, the automatic changeover of the constant voltage drive state and the constant current drive state of the LED drive circuit is realized through the photocoupler feed back circuit and the PWM control chip. Aiming to the existing problems of the traditional drive circuit and combining the drive characteristic of the LED, the utility model discloses a self-adapting high-power LED illuminating drive circuit with simple structure, high reliability and steady luminous intensity.
Description
Technical field
The utility model relates to the led lighting Driving technique, relates in particular to a kind of drive circuit of great power LED general service lamp.
Background technology
LED be a kind of energy-saving and environmental protection, small size, fast, multicolour, long-life new type light source.But the driver supporting with the LED lamp but do not catch up with the needs that led light source develops, and the drive circuit performance is not good, the bottleneck that the failure rate height has become constraint LED to apply.
Existing led drive circuit, as capacity voltage dropping circuit and switch voltage-stabilizing circuit, deeply do not utilize the bright number of output light stream of LED closely related with the temperature and the electric current of PN junction, will cause the aging in advance of LED, can not effectively satisfy the requirement that the LED illumination drives with wavelength.
Existing conventional constant current or constant voltage switch power supply topological structure are, civil power (50HZ, 90V-264V) through behind the 50HZ rectifying and wave-filtering, send into the major loop of forming by elementary winding of high frequency transformer and switching tube, behind high frequency transformation, rectifying and wave-filtering, feed back to master control IC, thereby make curtage keep constant by voltage sample or current sampling circuit.This conventional constant current or constant voltage Switching Power Supply must be brought following problem as the LED general illumination, because time lengthening along with led array work, the working temperature of LED rises, and will cause that the useful life electric current reduces, if adopt conventional constant current must make LED aging in advance.And the led drive circuit of this routine may cause the linksystem of LED lamp to destroy when open circuit or short circuit appear in the LED lamp.
And conventional drive circuit has been ignored the driven management ability of external ambient light, can not regulate electric current according to the variation self adaptation of surround lighting, carry out surround lighting and compensate automatically, and this long-term work for pseudo-white light LEDs is extremely important.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of constant voltage driving state and the constant-current driving state can be changed automatically, and realization has the high-power LED drive circuit of adaptation function to LED lamp open circuit or short circuit.
The technical problem that the utility model further will solve provides a kind of high-power LED drive circuit that can realize constant voltage output compensation.
The technical problem that the utility model further will solve provides a kind of high-power LED drive circuit that can realize the surround lighting current compensation.
The technical problem that the utility model further will solve provides a kind of high-power LED drive circuit that can adapt to the input of wide voltage and can limit the maximum output current peak value.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of high-power LED drive circuit, comprise rectification circuit, switching tube, high frequency transformation/rectification circuit, pwm chip and optocoupler feedback circuit, pwm chip is accepted the feedback of optocoupler feedback circuit and the work of control whole LED drive circuit, also comprise output current detection circuit, described output current detection circuit is connected the output of high frequency transformation/rectification circuit, by optocoupler feedback circuit and pwm chip, realize the automatic conversion of led drive circuit constant voltage driving state and constant-current driving state.
Above-described high-power LED drive circuit, preferably also comprise output voltage compensating circuit, described output voltage and compensating circuit are connected the output of high frequency transformation/rectification circuit, by optocoupler feedback circuit and pwm chip, realize the constant voltage output compensation of led drive circuit.
Above-described high-power LED drive circuit, preferably also comprise ambient light detection circuit, described ambient light detection circuit is connected the output of high frequency transformation/rectification circuit, by optocoupler feedback circuit and pwm chip, realizes led drive circuit surround lighting current compensation.
Above-described high-power LED drive circuit, preferably also comprise the input voltage compensation circuit, described input voltage detection circuit is connected the output of rectification circuit, the controlled end of its output termination pwm chip, the wide voltage input function of realization led drive circuit.
Above-described high-power LED drive circuit preferably also comprises the temperature detection compensating circuit, and described temperature detection compensating circuit connects the controlled end of pwm chip by voltage compensating circuit, realizes the qualification of led drive circuit maximum output current peak value.
Above-described high-power LED drive circuit, described pwm chip is the SA7527 chip preferably.
Above-described high-power LED drive circuit, the sampling section of optocoupler feedback circuit can comprise sampling resistor R15, R16, R17, optocoupler, precision voltage regulator; The main limit of R16 one termination led drive circuit low-voltage output, the anode of another termination optocoupler light-emitting diode, the negative electrode of optocoupler light-emitting diode connects the precision voltage regulator negative electrode, and the anode of precision voltage regulator connects low pressure ground; After R15 and the R17 serial connection, the main limit of R15 one termination led drive circuit low-voltage output, the termination low pressure ground of R17, the contact between R15 and R17 connects the reference edge of precision voltage regulator.The output of optocoupler feedback circuit comprises feedback coil, rectifier diode D4,, the phototriode Q4 of optocoupler.The output of feedback coil connects the collector electrode of Q4 and 8 pin of SA7527 chip through D4, and the emitter of Q4 connects 1 pin of SA7527 chip; Described output current detection circuit comprises current sampling resistor R18 and triode Q3, and R18 is serially connected in the limit of paying of low-voltage output, termination low pressure ground, and the base stage of another termination Q3, the collector electrode of Q3 connects the negative electrode of optocoupler light-emitting diode, and emitter connects low pressure ground.
Above-described high-power LED drive circuit preferably is serially connected with light sensor WT between the reference edge of the sampling resistor R15 of TL431 precision voltage regulator and TL431 precision voltage regulator.
Above-described high-power LED drive circuit, described ambient light detection circuit can comprise sampling resistor R3, photoelectric sensor and triode Q2.The main limit of photoelectric sensor one termination led drive circuit low-voltage output, another termination R3, R3 connects the base stage of Q2, and the collector electrode of Q2 connects the negative electrode of optocoupler light-emitting diode, and emitter connects low pressure ground.
Above-described high-power LED drive circuit preferably also comprises input voltage compensation circuit and temperature detection compensating circuit; Described input voltage compensation circuit comprises input voltage detection circuit and output voltage detecting circuit; Input voltage detection circuit comprises input voltage sampling resistor R1 and the R2 that is connected between rectification circuit output end and the ground.The contact of R1 and R2 connects 3 pin of SA7527 chip; Output voltage detecting circuit comprises output voltage sampling resistor R8, R9 and R10, and R10 connects between the output and ground of optocoupler phototriode Q4, and R8, R9 series connection back connects 2 pin of Q4 output and SA7527 chip; Described temperature detection compensating circuit comprises resistance R 4 and photo resistance RT, after R4 and the RT serial connection, and a termination high pressure ground, the contact of another termination R1 and R2.
The utility model comprises output current detection circuit; described output current detection circuit is connected the output of high frequency transformation/rectification circuit; by optocoupler feedback circuit and pwm chip; realize the automatic conversion of led drive circuit constant voltage driving state and constant-current driving state; adaptive guard in the time of can realizing LED lamp open circuit or short circuit prevents that the linksystem of the LED lamp that may cause from destroying.
The utility model such as further employing output voltage compensating circuit, just can realize the constant voltage output compensation of led drive circuit, when the PN junction temperature raise, output voltage compensating circuit can suitably improve the breakover point voltage that constant voltage starts, thereby realizes reliable constant current/constant voltage translation function.
The utility model such as further employing ambient light detection circuit, when surround lighting changed, the feasible electric current by optocoupler of ambient light detection circuit changed, thereby reached the purpose of surround lighting current compensation.
The utility model just can adapt to wide voltage input and also can the maximum output current peak value of led drive circuit be limited as further adopting input voltage compensation circuit and temperature detection compensating circuit.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the theory diagram of the utility model high-power LED drive circuit embodiment.
Fig. 2 is the theory diagram of pwm chip SA7527 internal structure.
Fig. 3 is the circuit theory diagrams of the utility model high-power LED drive circuit embodiment.
Embodiment
As shown in Figure 1, the utility model high-power LED drive circuit embodiment comprises industrial frequency rectifying circuit, switching tube, high frequency transformation/rectification circuit, pwm chip, current/voltage/light intensity testing circuit, input voltage compensation circuit, temperature detection compensating circuit and optocoupler feedback circuit.The industrial frequency rectifying circuit is to the industrial-frequency alternating current rectifying and wave-filtering of the 82V-290V of input, and the primary coil of high frequency transformation/rectification circuit connects the output of rectification circuit and is subjected to switch controlled.The optocoupler feedback circuit connects the output of high frequency transformation/rectification circuit.Pwm chip is accepted the feedback of optocoupler feedback circuit and the work of control switch pipe.Current/voltage/light intensity testing circuit connects the output of high frequency transformation/rectification circuit, by optocoupler feedback circuit and pwm chip, realize automatic conversion, constant voltage output compensation and the surround lighting current compensation of led drive circuit constant voltage driving state and constant-current driving state.The input voltage compensation circuit connects the output of industrial frequency rectifying circuit, the controlled end of its output termination pwm chip, the wide voltage input function of realization led drive circuit.The temperature detection compensating circuit connects the controlled end of pwm chip by voltage compensating circuit, realizes the qualification of led drive circuit maximum output current peak value
As shown in Figure 3, the operation principle of the utility model high-power LED drive circuit embodiment is as follows:
Present embodiment pwm chip U1 adopts the SA7527 of 8 pin encapsulation.SA7527 is a powerful chip; it is except the function of general pwm chip; built-in R/C filter also is provided, has started functions such as timer, overvoltage protection, zero current detection, multiplier, inner band-gap reference and special anti-breakdown circuit, its inner primary structure as shown in Figure 2.
After the bridge commutating and capacitor C 1 filtering that the 50HZ/60HZ alternating current of importing from the AC port passes through to be made up of 4 IN4007, input high frequency transformer EI25.The switching circuit of being made up of metal-oxide-semiconductor field effect transistor Q1 is serially connected between high frequency transformer EI25 primary coil secondary and the ground.The drain electrode of metal-oxide-semiconductor field effect transistor Q1 connects the EI25 primary coil, and source electrode is by current sampling resistor R14 ground connection, and grid connects 7 pin (OUT) of pwm chip U1 SA7527 by resistance R 13.Field effect transistor Q1 source electrode connects 4 pin (CS) of pwm chip U1 SA7527 with the contact of current sampling resistor R14, and source current is detected current limliting.Diode D5, D6 protect metal-oxide-semiconductor field effect transistor Q1.
The output of the secondary coil of high frequency transformer EI25 is exported from 2 OUT terminals behind the current rectifying and wave filtering circuit rectifying and wave-filtering that D7, L1, C7, C8 form at last.
The sampling section of the optocoupler feedback main circuit of present embodiment comprises sampling resistor R15, R16, R17, the light-emitting diode of optocoupler PC817, precision voltage regulator TL431, capacitor C 9.The main limit of sampling resistor R16 one termination led drive circuit low-voltage output, the anode of the light-emitting diode of another termination optocoupler PC817, the negative electrode of the light-emitting diode of optocoupler PC817 connects precision voltage regulator TL431 negative electrode, and the negative electrode of precision voltage regulator TL431 connects low pressure ground; After sampling resistor R15 and the R17 serial connection, the main limit of R15 one termination led drive circuit low-voltage output, the end ground connection of R17, the contact between sampling resistor R15 and R17 connects the reference edge of precision voltage regulator TL431.The output of optocoupler feedback main circuit comprises feedback coil, rectifier diode D4, the phototriode Q4 of filter capacitor C6, optocoupler PC817 and resistance R 9.The output of feedback coil connects the collector electrode of phototriode Q4 of optocoupler PC817 and 8 pin (VDD) of pwm chip U1 SA7527 through rectifier diode D4, the emitter of the phototriode Q4 of optocoupler PC817 connects 1 pin (INV) of pwm chip U1 SA7527 through resistance R 9.
The principle of the optocoupler feedback main circuit of present embodiment is, low pressure output is amplified through the TL431 feedback and with error, TL431 drives the luminous component of optocoupler PC817, and the feedback voltage that the optocoupler photographic department branch that is in power supply high pressure master limit obtains, by adjusting the switching time of pwm chip, obtain a stable dc low-voltage voltage output.
The output current detection circuit of present embodiment comprises R18, R11 and Q3.Current sampling resistor R18 is serially connected in the limit of paying of led drive circuit low-voltage output, termination low pressure ground, and the other end connects the base stage of triode Q3 by resistance R 11 as sampling end.The collector electrode of triode Q3 connects the negative electrode of optocoupler PC817 light-emitting diode, and emitter connects low pressure ground.When the led drive circuit output current when the pressure drop of sampling resistor surpasses 0.7V, triode Q3 conducting, the electric current that flows through optocoupler PC817 light-emitting diode mainly is subjected to the control of switch power supply output current size, this moment, Switching Power Supply was operated in the constant current output state; Otherwise be the constant voltage output state, and the output voltage size depend on accurate three-terminal voltage-stabilizing TL431 voltage stabilizing size.When automatic adjustment constant current/constant voltage characteristic had so advantageously protected LED open circuit and short circuit to occur, the linksystem that conventional drive circuit may cause destroyed.
In order to overcome the rising that the rising of LED PN junction temperature will cause the PN junction pressure drop, what driving power may be too early changes the constant voltage operating state over to from the constant current operating state, thereby influences the stability of LED luminous flux.For this reason, present embodiment has increased output voltage compensating circuit, output voltage compensating circuit is to introduce constant voltage output voltage compensation terminal WT (light sensor or photo resistance) at the led drive circuit low-voltage output, and specific practice is that constant voltage output voltage compensation terminal WT is serially connected between the reference edge of the sampling resistor R15 of TL431 precision voltage regulator and TL431 precision voltage regulator.When the PN junction temperature raise, output voltage compensating circuit can suitably improve the breakover point voltage that constant voltage starts, thereby realizes reliable constant current/constant voltage translation function.
The ambient light detection circuit of present embodiment comprises sampling resistor R3, photoelectric sensors A PD9003 and triode Q2.The main limit of photoelectric sensors A PD9003 one termination led drive circuit low-voltage output, another termination sampling resistor R3, sampling resistor R3 connects the base stage of triode Q2.The collector electrode of triode Q2 connects the negative electrode of optocoupler PC817 light-emitting diode, grounded emitter.When surround lighting changed, the pressure drop of sampling resistor R3 caused the change of Q2 base voltage, and feasible electric current by optocoupler PC817 light-emitting diode changes, thereby reached the purpose of surround lighting current compensation.
The input voltage compensation circuit comprises input voltage detection circuit and output voltage detecting circuit.Input voltage detection circuit comprises input voltage sampling resistor R1 and the R2 that is connected between IN4007 rectifier bridge output and the ground.The contact of R1 and R2 connects 3 pin (MUL terminal) of SA7527.Output voltage detecting circuit comprises output voltage sampling resistor R8, R9 and R10.R10 connects between the phototriode output and ground of optocoupler PC817, and R8, R9 series connection back connects 2 pin (E-O terminal) of optocoupler PC817 phototriode output and SA7527.The input voltage compensation circuit is imported two inputs, 3 pin and 2 pin (MUL terminal and E-O terminal) of SA7527 product calculation to the detection voltage of input rectifying high pressure sampled signal and output respectively, and operation result is as the control signal of PWM; When input voltage reduced, the result of product calculation reduced, and PWM pulsewidth output is increased, and had guaranteed the stable of under wide input range condition led drive circuit output.
The temperature detection compensating circuit of present embodiment comprises resistance R 4 and photo resistance RT.After resistance R 4 and the photo resistance RT serial connection, an end ground connection, the contact of another termination input voltage detection circuit R1 and R2.The temperature detection compensating circuit utilizes photo resistance RT to carry out the LED working temperature and detects, when RT detects the rising of LED working temperature, the sub-MUL of the multiplier input equivalent resistance over the ground of SA7527 chip is reduced, it is big that MUL terminal input signal becomes, make the output current size slightly descend, compensated the contradiction that LED reliably working life-span electric current reduced after temperature raise effectively with the rising of temperature.
Claims (10)
1, a kind of high-power LED drive circuit, comprise rectification circuit, switching tube, high frequency transformation/rectification circuit, pwm chip and optocoupler feedback circuit, pwm chip is accepted the feedback of optocoupler feedback circuit and the work of control whole LED drive circuit, it is characterized in that, also comprise output current detection circuit, described output current detection circuit is connected the output of high frequency transformation/rectification circuit, by optocoupler feedback circuit and pwm chip, realize the automatic conversion of led drive circuit constant voltage driving state and constant-current driving state.
2, high-power LED drive circuit according to claim 1, it is characterized in that, also comprise output voltage compensating circuit, described output voltage and compensating circuit are connected the output of high frequency transformation/rectification circuit, by optocoupler feedback circuit and pwm chip, realize the constant voltage output compensation of led drive circuit.
3, high-power LED drive circuit according to claim 2, it is characterized in that, also comprise ambient light detection circuit, described ambient light detection circuit is connected the output of high frequency transformation/rectification circuit, by optocoupler feedback circuit and pwm chip, realize led drive circuit surround lighting current compensation.
4, high-power LED drive circuit according to claim 3, it is characterized in that, also comprise the input voltage compensation circuit, described input voltage detection circuit is connected the output of rectification circuit, the controlled end of its output termination pwm chip, the wide voltage input function of realization led drive circuit.
5, high-power LED drive circuit according to claim 4, it is characterized in that, also comprise the temperature detection compensating circuit, described temperature detection compensating circuit connects the controlled end of pwm chip by voltage compensating circuit, realizes the qualification of led drive circuit maximum output current peak value.
6, high-power LED drive circuit according to claim 3 is characterized in that, described pwm chip is the SA7527 chip.
7, high-power LED drive circuit according to claim 6 is characterized in that, the sampling section of optocoupler feedback circuit comprises sampling resistor R15, R16, R17, optocoupler, precision voltage regulator; The main limit of R16 one termination led drive circuit low-voltage output, the anode of another termination optocoupler light-emitting diode, the negative electrode of optocoupler light-emitting diode connects the precision voltage regulator negative electrode, and the anode of precision voltage regulator connects low pressure ground; After R15 and the R17 serial connection, the main limit of R15 one termination led drive circuit low-voltage output, the termination low pressure ground of R17, the contact between R15 and R17 connects the reference edge of precision voltage regulator; The output of optocoupler feedback circuit comprises feedback coil, rectifier diode D4, the phototriode Q4 of optocoupler; The output of feedback coil connects the collector electrode of Q4 and 8 pin of SA7527 chip through D4, and the emitter of Q4 connects 1 pin of SA752 7 chips; Described output current detection circuit comprises current sampling resistor R18 and triode Q3, and R18 is serially connected in the limit of paying of low-voltage output, termination low pressure ground, and the base stage of another termination Q3, the collector electrode of Q3 connects the negative electrode of optocoupler light-emitting diode, and emitter connects low pressure ground.
8, high-power LED drive circuit according to claim 6 is characterized in that, is serially connected with light sensor WT between the reference edge of the sampling resistor R15 of TL431 precision voltage regulator and TL431 precision voltage regulator.
9, high-power LED drive circuit according to claim 6 is characterized in that, described ambient light detection circuit comprises sampling resistor R3, photoelectric sensor and triode Q2; The main limit of photoelectric sensor one termination led drive circuit low-voltage output, another termination R3, R3 connects the base stage of Q2, and the collector electrode of Q2 connects the negative electrode of optocoupler light-emitting diode, and emitter connects low pressure ground.
10, high-power LED drive circuit according to claim 6 is characterized in that, also comprises input voltage compensation circuit and temperature detection compensating circuit; Described input voltage compensation circuit comprises input voltage detection circuit and output voltage detecting circuit; Input voltage detection circuit comprises input voltage sampling resistor R1 and the R2 that is connected between rectification circuit output end and the ground; The contact of R1 and R2 connects 3 pin of SA7527 chip; Output voltage detecting circuit comprises output voltage sampling resistor R8, R9 and R10, and R10 connects between the output and high pressure ground of optocoupler phototriode Q4, and R8, R9 series connection back connects 2 pin of Q4 output and SA7527 chip; Described temperature detection compensating circuit comprises resistance R 4 and photo resistance RT, after R4 and the RT serial connection, and a termination high pressure ground, the contact of another termination R1 and R2.
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| CNU2007201182337U CN201001216Y (en) | 2007-01-24 | 2007-01-24 | High power LED drive circuit |
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| CN114513878A (en) * | 2022-01-19 | 2022-05-17 | 马瑞利汽车零部件(芜湖)有限公司 | Constant current control circuit and automotive low voltage constant current system |
-
2007
- 2007-01-24 CN CNU2007201182337U patent/CN201001216Y/en not_active Expired - Fee Related
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