CN201608945U - Driver of LED light source - Google Patents

Driver of LED light source Download PDF

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Publication number
CN201608945U
CN201608945U CN2010201106161U CN201020110616U CN201608945U CN 201608945 U CN201608945 U CN 201608945U CN 2010201106161 U CN2010201106161 U CN 2010201106161U CN 201020110616 U CN201020110616 U CN 201020110616U CN 201608945 U CN201608945 U CN 201608945U
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China
Prior art keywords
circuit
current
output
power
driver
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Expired - Lifetime
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CN2010201106161U
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Inventor
卿晓辉
成军
徐文洪
邓陵泉
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Bright Photoelectric Ltd Co Of Silk Of Sichuan
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Bright Photoelectric Ltd Co Of Silk Of Sichuan
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Abstract

The utility model discloses a driver of an LED light source, which comprises a main circuit, wherein a loop of a first rectification filter circuit of the main circuit is connected with a field-effect tube in series, and the field-effect tube is further connected with an output circuit; the driver also comprises a backup circuit, and the field-effect tube completes the switching between the main circuit and the backup circuit as an electronic switch on the one hand, and prevents the influence of a rectifying diode in the first rectification filter circuit on the backup circuit after short circuit on the other hand; and the backup circuit also comprises a PLC multifunctional control part. The driver has the technical effects of improving the system reliability, reducing the cost, being capable of intelligently adjusting the output power and the like.

Description

The driver of led light source
Technical field
The utility model relates generally to a kind of led light source, specially refers to a kind of driver of led light source.
Background technology
Led light source gets more and more with high-efficiency energy-saving long-life environmental protection (not containing halogen element) and is applied in various occasions, the good led light source life-span of design can reach 50 now, 000 hour life-span, the failure cause of turning off the light above 90% is the damage of driver, improve the life-span of led driver, eliminate the short slab of quality, the life-span equilibrium that makes each parts of entire product is very important studying a question.
Traditional LED power drives generally is the scheme that adopts as accompanying drawing 1:
Main functional part is
1. insurance: be used for when short circuit appears in whole light fixture and the disconnection of whole current supply circuit,, damage in order to avoid influence whole electric power systems.
2. lightning protection/LF/EMI: filtering external pulse and disturb and prevent the internal interference pulse conduction simultaneously to external electrical network, the reduction starup current that is mainly RT device composition is excessive, and bleed off falls the spike of lightning induction, prevents to damage power supply inside
3. rectification: is civil power pulsating direct current by exchange conversion
4. PFC initiatively:, whole electrical source power factor is improved by the phase place that the high-frequency impulse switch is proofreaied and correct input voltage and electric current
5. Power Conversion: by power transformer high-tension pulse current is transformed to the interchange of low-voltage, high-current, the electrical isolation of high-low pressure is provided simultaneously.
6. rectifying and wave-filtering: is the exchange conversion of high frequency the high frequency direct current, carries out filtering simultaneously and becomes the very little direct current of ripple.
7. output: load LED
8. sampling feedback/protection: the current/voltage to power supply output detects, and feeds back to prime, to keep specified electric current LED is driven, and simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual.
9.PWM controller: accept feedback signal and control signal, adjust peak pulse duration, finish functions such as adjusting output and delayed startup shutoff.
And can recognize from the voltage-current characteristic of LED, along with the increase of the voltage electric current by LED sharply increases, the fluctuation slightly of voltage all can cause the marked change of electric current, even voltage can remain unchanged simultaneously, but along with the temperature of led light source increases the electric current increasing, electric current strengthens temperature further increases the formation vicious circle, traditional source of stable pressure can't satisfy the needs of driving LED light source, crossing current drives the ideal style that becomes the driving LED light source, be divided into many integrated and single 2 kinds of modes of arranging in the present led light source industry, general driver also divides for constant current single channel and the first voltage stabilizing mode of multiple constant current again, outstanding light source is made up of about 100 LED at most, and the switch power supply system of a band active capability correction can use basically above 300 various elements compositions, wherein withered rectifier diode damage of high-voltage filtering capacitor electrolyte and switching tube damage are than serious problems, cause the driver no-output, the LED light fixture that the former life-span is long is because turning off the light appears in the damage of driver, particularly the expense of cost of changing for the light fixture of work high above the ground such as street lamp and maintenance is just considerably beyond the expense of a power supply, and the while has also influenced conducting promotion to of LED.
Notification number is CN201018696; date of declaration is the control circuit that the Chinese utility model patent on February 6th, 2008 discloses a kind of LED driving power; include power supply changeover device; current rectifying and wave filtering circuit; constant-current circuit; pressure limiting circuit and optocoupler; it is characterized in that: on the output loop of current rectifying and wave filtering circuit, also be serially connected with the current-limiting protection circuit that comprises a triode and a current-limiting resistance at least; this current-limiting protection circuit can make the electric current that flows through LED within the trouble free service current range in the output current size of connection switch closure moment of out-put supply restriction current rectifying and wave filtering circuit.Compared with prior art, the improvement technical scheme that this utility model adopts is that to be connected in series one behind the output high-frequency filter circuit of LED driving power be the current-limiting circuit of core with master control triode and current-limiting resistance, realizes the also protection of certain effect.
Publication number is CN101616524, and the Chinese invention patent that open day is on December 30th, 2009 discloses a kind of commercial LED illumination driver.It comprises rectification module, and its input inserts utility grid, and input current is carried out rectification and filtering; Active quasi-resonance power factor correction module, its input links to each other with the rectification module output, can suppress the harmonic wave that led driver produces, and power factor is compensated; The direct voltage output module, its input links to each other with the output of active quasi-resonance power factor correction module, for load LED lamp string provides operating voltage.This invention is applied to the APFC of quasi-resonance working method in the design of LED illumination driver, realizes the substance of LED illumination driver power factor is improved.But and the problem of unresolved above-mentioned led driver quality short slab.
The utility model content
The utility model has overcome the deficiencies in the prior art, and a kind of driver of led light source is provided, and this driver has fallback circuit, has improved the useful life of led light source greatly.
The technical solution of the utility model is as follows:
A kind of driver of led light source comprises a main circuit, and this main circuit comprises
First rectification circuit, its input inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Initiatively PFC is serially connected on the output loop of first rectification circuit, by the phase place that the high-frequency impulse switch is proofreaied and correct input voltage and electric current, whole electrical source power factor is improved;
First power conversion circuit is serially connected on the output loop of PFC initiatively, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
First current rectifying and wave filtering circuit is serially connected on the output loop of first power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously;
Output circuit joins with the output of first current rectifying and wave filtering circuit, and load is a led light source;
First sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to a PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The one PWM controller receives the feedback signal and the control signal of first sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
Also be serially connected with a field effect transistor on the loop of described first current rectifying and wave filtering circuit, field effect transistor links to each other with output circuit again;
The driver of described led light source also comprises a fallback circuit, and described fallback circuit comprises:
Second rectification circuit, its input also inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Second power conversion circuit is connected in series on the second rectification circuit output loop, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
Second current rectifying and wave filtering circuit is serially connected on the output loop of second power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously, and the output of second current rectifying and wave filtering circuit also joins with output circuit;
Second sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to the 2nd PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The 2nd PWM controller receives the feedback signal and the control signal of second sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
Field effect transistor is finished the switching of main circuit and fallback circuit on the one hand as electronic switch, preventing simultaneously influences the fallback circuit part after the rectifier diode short circuit in first current rectifying and wave filtering circuit, and field effect transistor is finished rectified action after utilizing itself the rectifier diode short circuit of parasitic diode in first current rectifying and wave filtering circuit simultaneously.
Further technical scheme is:
Described fallback circuit also comprises PIC multi-functional control part; this PIC multi-functional control part also picks out from output circuit; link to each other with a PWM controller, the 2nd PWM controller and field effect transistor respectively simultaneously again; with the single-chip microcomputer of realizing PIC multi-functional control part the working condition of whole power supply is monitored; hardware protection is partly carried out the backup of software, the interface of the driver of led light source to the outside expansion is provided simultaneously.
Described PIC multi-functional control part is connected with external expansion module by the interface to the outside expansion, and intelligentized function expansion is provided, time control function or light sensation function or acoustic control and mobiles detecting function, and the scene control signal transmits and centralized control technique.
The input of described first rectification circuit is connected with first insurance circuit and first lightning protection circuit, wherein the first insurance circuit input inserts civil power, the first insurance circuit output links to each other with first lightning protection circuit, and the first lightning protection circuit output connects first rectification circuit.
The input of described second rectification circuit is connected with second insurance circuit and second lightning protection circuit, wherein the second insurance circuit input inserts civil power, the second insurance circuit output links to each other with second lightning protection circuit, and the second lightning protection circuit output connects second rectification circuit.
Compared with prior art, the beneficial effects of the utility model are:
1 improves system reliability, and low cost provides and can back up design, reduces the dead lamp situation of once bright lamp.
Considered the main circuit short circuit during 2 system designs, main circuit open circuit, main circuit discontinuous operation, main switching tube, filter capacitor, main devices such as rectifier diode the situation of open circuit and short circuit occurs breaking down respectively, have considered the situation of hardware and PIC funtion part inefficacy simultaneously.
It is several right that 3 stand-by circuit partial cancellation PFC mainly are that power supply that the circuit with respect to hundreds of small cup lamp breaks down has only after all, and whole piece circuit power supply quality can not impact, and can reduce cost.
4 the utility model can diminish according to the power output of adjustment power supply, rather than turn-off the output of whole power supply.
5 because the external expansion module that increases can be indicated enabling of standby power supply, can not interrupt the use of product like this in highly reliable occasion, changes in regular maintenance again.Do not influence normal use.
6 external multifunctional application are very strong, and it all is to write at sequence of threads that PIC has reserved the fine setting that external interface makes power, has avoided the potentiometer contact failure.
Description of drawings
Fig. 1 is the circuit block diagram of traditional led driver;
Fig. 2 is the circuit block diagram of the utility model embodiment 1;
Fig. 3 is the circuit block diagram of the utility model embodiment 2;
Fig. 4 is the circuit block diagram of the utility model embodiment 3;
Fig. 5 is the circuit block diagram of the utility model embodiment 4.
Embodiment
Below in conjunction with accompanying drawing the utility model is further elaborated.
Embodiment 1
As shown in Figure 2, a kind of driver of led light source comprises a main circuit, and this main circuit comprises:
First rectification circuit, its input inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Initiatively PFC is serially connected on the output loop of first rectification circuit, by the phase place that the high-frequency impulse switch is proofreaied and correct input voltage and electric current, whole electrical source power factor is improved;
First power conversion circuit is serially connected on the output loop of PFC initiatively, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
First current rectifying and wave filtering circuit is serially connected on the output loop of first power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously;
Output circuit joins with the output of first current rectifying and wave filtering circuit, and load is a led light source;
First sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to a PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The one PWM controller receives the feedback signal and the control signal of first sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
Also be serially connected with a field effect transistor on the loop of described first current rectifying and wave filtering circuit, field effect transistor links to each other with output circuit again;
The driver of described led light source also comprises a fallback circuit, and described fallback circuit comprises:
Second rectification circuit, its input also inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Second power conversion circuit is connected in series on the second rectification circuit output loop, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
Second current rectifying and wave filtering circuit is serially connected on the output loop of second power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously, and the output of second current rectifying and wave filtering circuit also joins with output circuit;
Second sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to the 2nd PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The 2nd PWM controller receives the feedback signal and the control signal of second sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
Field effect transistor is finished the switching of main circuit and fallback circuit on the one hand as electronic switch, preventing simultaneously influences the fallback circuit part after the rectifier diode short circuit in first current rectifying and wave filtering circuit, and field effect transistor is finished rectified action after utilizing itself the rectifier diode short circuit of parasitic diode in first current rectifying and wave filtering circuit simultaneously.
Embodiment 2
As shown in Figure 3, a kind of driver of led light source comprises a main circuit, and this main circuit comprises:
First rectification circuit, its input inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Initiatively PFC is serially connected on the output loop of first rectification circuit, by the phase place that the high-frequency impulse switch is proofreaied and correct input voltage and electric current, whole electrical source power factor is improved;
First power conversion circuit is serially connected on the output loop of PFC initiatively, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
First current rectifying and wave filtering circuit is serially connected on the output loop of first power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously;
Output circuit joins with the output of first current rectifying and wave filtering circuit, and load is a led light source;
First sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to a PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The one PWM controller receives the feedback signal and the control signal of first sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
Also be serially connected with a field effect transistor on the loop of described first current rectifying and wave filtering circuit, field effect transistor links to each other with output circuit again;
The driver of described led light source also comprises a fallback circuit, and described fallback circuit comprises:
Second rectification circuit, its input also inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Second power conversion circuit is connected in series on the second rectification circuit output loop, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
Second current rectifying and wave filtering circuit is serially connected on the output loop of second power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously, and the output of second current rectifying and wave filtering circuit also joins with output circuit;
Second sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to the 2nd PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The 2nd PWM controller receives the feedback signal and the control signal of second sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
Field effect transistor is finished the switching of main circuit and fallback circuit on the one hand as electronic switch, preventing simultaneously influences the fallback circuit part after the rectifier diode short circuit in first current rectifying and wave filtering circuit, and field effect transistor is finished rectified action after utilizing itself the rectifier diode short circuit of parasitic diode in first current rectifying and wave filtering circuit simultaneously.
Also increased PIC multi-functional control part on the described fallback circuit; this PIC multi-functional control part also picks out from output circuit; link to each other with field effect transistor with a PWM controller, the 2nd PWM controller respectively simultaneously again; therefore the single-chip microcomputer of PIC multi-functional control part can be monitored the working condition of whole power supply, hardware protection is partly carried out the backup of software.The interface of the driver of led light source to the outside expansion is provided simultaneously.The color that microprocessor in follow-up functional module can the perception mood adopts corresponding scheme and the processor communication in the power supply just can regulate light fixture by the infrared radiation of human body body surface then make the people when excitement gets etc. for red, be blueness etc. in the time of anger.
Embodiment 3
As shown in Figure 4, a kind of driver of led light source comprises a main circuit, and this main circuit comprises:
First rectification circuit, its input inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Initiatively PFC is serially connected on the output loop of first rectification circuit, by the phase place that the high-frequency impulse switch is proofreaied and correct input voltage and electric current, whole electrical source power factor is improved;
First power conversion circuit is serially connected on the output loop of PFC initiatively, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
First current rectifying and wave filtering circuit is serially connected on the output loop of first power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously;
Output circuit joins with the output of first current rectifying and wave filtering circuit, and load is a led light source;
First sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to a PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The one PWM controller receives the feedback signal and the control signal of first sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
Also be serially connected with a field effect transistor on the loop of described first current rectifying and wave filtering circuit, field effect transistor links to each other with output circuit again;
The driver of described led light source also comprises a fallback circuit, and described fallback circuit comprises:
Second rectification circuit, its input also inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Second power conversion circuit is connected in series on the second rectification circuit output loop, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
Second current rectifying and wave filtering circuit is serially connected on the output loop of second power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously, and the output of second current rectifying and wave filtering circuit also joins with output circuit;
Second sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to the 2nd PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The 2nd PWM controller receives the feedback signal and the control signal of second sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
Field effect transistor is finished the switching of main circuit and fallback circuit on the one hand as electronic switch, preventing simultaneously influences the fallback circuit part after the rectifier diode short circuit in first current rectifying and wave filtering circuit, and field effect transistor is finished rectified action after utilizing itself the rectifier diode short circuit of parasitic diode in first current rectifying and wave filtering circuit simultaneously.
Also increased PIC multi-functional control part on the described fallback circuit; this PIC multi-functional control part also picks out from output circuit; link to each other with field effect transistor with a PWM controller, the 2nd PWM controller respectively simultaneously again; therefore the single-chip microcomputer of PIC multi-functional control part can be monitored the working condition of whole power supply, hardware protection is partly carried out the backup of software.The interface of the driver of led light source to the outside expansion is provided simultaneously.The color that microprocessor in follow-up functional module can the perception mood adopts corresponding scheme and the processor communication in the power supply just can regulate light fixture by the infrared radiation of human body body surface then make the people when excitement gets etc. for red, be blueness etc. in the time of anger.Also increased external expansion module among this embodiment, PIC multi-functional control part is connected with external expansion module by the interface to the outside expansion, intelligentized function expansion is provided, time control function or light sensation function or acoustic control and mobiles detecting function, the scene control signal transmits and centralized control technique.Such as: the three mirror probes that adopt grating and Doppler's microwave to combine are finished the detection to moving vehicle, earlier by Doppler's Microwave Measurement to moving object, again by the grating confirmation of synchronization, be suitable for carrying out the occasion of intermittent illumination time at needs, such as tunnel illumination, evening, vehicle was considerably less, traditional conservation measures is to reduce brightness, adopt this detection mode only to throw light in whole tunnel, back late at night with 10% illumination, in preceding 500 meters zone doppler sensor is installed, sail when coming when having detected vehicle, the flat-out work gradually of the light fixture in tunnel, rear, vehicle crosses the back light fixture and recovers very lower powered work, and the advantage of giving full play to the LED light modulation reaches fully energy-conservation effect.
Embodiment 4
As shown in Figure 5, embodiment 4 replenishes on the basis of any one embodiment in front, just the input at described first rectification circuit is connected with first insurance circuit and first lightning protection circuit, wherein the first insurance circuit input inserts civil power, the first insurance circuit output links to each other with first lightning protection circuit, and the first lightning protection circuit output connects first rectification circuit.Input at second rectification circuit is connected with second insurance circuit and second lightning protection circuit simultaneously, wherein the second insurance circuit input inserts civil power, the second insurance circuit output links to each other with second lightning protection circuit, and the second lightning protection circuit output connects second rectification circuit.She Ji purpose is fusing insurance automatically after the first loop inefficacy short circuit like this, first loop and system is disconnected in order to avoid influence the normal function performance of fallback circuit.
Above-mentioned all hardware module or hardware device (for example: rectification circuit, current rectifying and wave filtering circuit, PWM controller etc.) all are the accepted standard circuit, just are not described in detail it here and have constituted.
Be example with most preferred embodiment 4 now, narrate the operation principle of whole LED power supply driver.
During the main circuit operate as normal, stand-by circuit is not worked owing to the existence of field effect transistor.When the phenomenon of short circuit having occurred in any one hardware module in the main circuit loop, first insurance circuit is had an effect, and the insurance meeting is burnt, and the main circuit loop of breaking that is to say that the device property that utilizes itself this main circuit loop of breaking makes it be output as zero.The PIC multi-functional control partly utilizes single-chip microcomputer to monitor the working condition of major loop simultaneously simultaneously, and the working condition of field effect transistor, assists and carries out the switching of main circuit and fallback circuit.Stand-by circuit partial cancellation PFC mainly is that the LED power supply driver that the circuit with respect to hundreds of small cup lamp breaks down has only a few after all, can not impact whole piece circuit power supply quality, and can reduce cost.PIC multi-functional control part is connected with external expansion module by the interface to the outside expansion, and intelligentized function expansion is provided, time control function or light sensation function or acoustic control and mobiles detecting function, and the scene control signal transmits and centralized control technique.Such as: the three mirror probes that adopt grating and Doppler's microwave to combine are finished the detection to moving vehicle, earlier by Doppler's Microwave Measurement to moving object, again by the grating confirmation of synchronization, be suitable for carrying out the occasion of intermittent illumination time at needs, such as tunnel illumination, evening, vehicle was considerably less, traditional conservation measures is to reduce brightness, adopt this detection mode only to throw light in whole tunnel, back late at night with 10% illumination, in preceding 500 meters zone doppler sensor is installed, sail when coming when having detected vehicle, the flat-out work gradually of the light fixture in tunnel, rear, vehicle crosses the back light fixture and recovers very lower powered work, and the advantage of giving full play to the LED light modulation reaches fully energy-conservation effect.

Claims (5)

1. the driver of a led light source comprises a main circuit, and this main circuit comprises
First rectification circuit, its input inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Initiatively PFC is serially connected on the output loop of first rectification circuit, by the phase place that the high-frequency impulse switch is proofreaied and correct input voltage and electric current, whole electrical source power factor is improved;
First power conversion circuit is serially connected on the output loop of PFC initiatively, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
First current rectifying and wave filtering circuit is serially connected on the output loop of first power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously;
Output circuit joins with the output of first current rectifying and wave filtering circuit, and load is a led light source;
First sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to a PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The one PWM controller receives the feedback signal and the control signal of first sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
It is characterized in that:
Also be serially connected with a field effect transistor on the loop of described first current rectifying and wave filtering circuit, field effect transistor links to each other with output circuit again;
The driver of described led light source also comprises a fallback circuit, and described fallback circuit comprises:
Second rectification circuit, its input also inserts civil power, is Rectified alternating current with civil power by exchange conversion;
Second power conversion circuit is connected in series on the second rectification circuit output loop, by power transformer high-tension pulse current is transformed to the alternating current of low-voltage, high-current, and the electrical isolation of high-low pressure is provided simultaneously;
Second current rectifying and wave filtering circuit is serially connected on the output loop of second power conversion circuit, is the exchange conversion of high frequency the high frequency direct current, is filtered into the very little direct current of ripple simultaneously, and the output of second current rectifying and wave filtering circuit also joins with output circuit;
Second sampling feedback circuit picks out from output circuit, and the current/voltage that power supply is exported detects, and feed back to the 2nd PWM controller, to keep specified electric current that LED is driven, simultaneously power supply output situation is monitored the work of power cutoff when appearance is unusual;
The 2nd PWM controller receives the feedback signal and the control signal of second sampling feedback circuit, adjusts peak pulse duration, finishes to adjust outputing to power conversion circuit and delayed startup turn-offs;
Field effect transistor is finished the switching of main circuit and fallback circuit on the one hand as electronic switch, preventing simultaneously influences the fallback circuit part after the rectifier diode short circuit in first current rectifying and wave filtering circuit, and field effect transistor is finished rectified action after utilizing itself the rectifier diode short circuit of parasitic diode in first current rectifying and wave filtering circuit simultaneously.
2. the driver of led light source as claimed in claim 1; it is characterized in that: described fallback circuit also comprises PIC multi-functional control part; this PIC multi-functional control part also picks out from output circuit; link to each other with a PWM controller, the 2nd PWM controller and field effect transistor respectively simultaneously again; the single-chip microcomputer of PIC multi-functional control part is monitored the working condition of whole power supply; hardware protection is partly carried out the backup of software, the interface of the driver of led light source to the outside expansion is provided simultaneously.
3. as claimed in claim 2, it is characterized in that: described PIC multi-functional control part is connected with external expansion module by the interface to the outside expansion, intelligentized function expansion is provided, time control function or light sensation function or acoustic control and mobiles detecting function, the scene control signal transmits and centralized control.
4. as the driver of described any led light source of claim 1-3, it is characterized in that: the input of described first rectification circuit is connected with first insurance circuit and first lightning protection circuit, wherein the first insurance circuit input inserts civil power, the first insurance circuit output links to each other with first lightning protection circuit, and the first lightning protection circuit output connects first rectification circuit.
5. the driver of led light source as claimed in claim 4, it is characterized in that: the input of described second rectification circuit is connected with second insurance circuit and second lightning protection circuit, wherein the second insurance circuit input inserts civil power, the second insurance circuit output links to each other with second lightning protection circuit, and the second lightning protection circuit output connects second rectification circuit.
CN2010201106161U 2010-02-09 2010-02-09 Driver of LED light source Expired - Lifetime CN201608945U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102685990A (en) * 2012-05-23 2012-09-19 沈阳新一代信息技术有限公司 Dimmable tunnel LED (Light-Emitting Diode) illumination energy-saving control system and method
CN101754540B (en) * 2010-02-09 2012-10-03 四川锦明光电股份有限公司 Drive of light emitting diode (LED) light source
CN103096561A (en) * 2011-10-31 2013-05-08 英飞特电子(杭州)股份有限公司 Constant current driver of light emitting diode (LED) light source
CN106301012A (en) * 2015-12-25 2017-01-04 厦门宏合自动化设备有限公司 A kind of electric operation power reduces power-supply system and the method for input stand-by power consumption

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101754540B (en) * 2010-02-09 2012-10-03 四川锦明光电股份有限公司 Drive of light emitting diode (LED) light source
CN103096561A (en) * 2011-10-31 2013-05-08 英飞特电子(杭州)股份有限公司 Constant current driver of light emitting diode (LED) light source
WO2013063996A1 (en) * 2011-10-31 2013-05-10 英飞特电子(杭州)股份有限公司 Constant current drive for led light source
CN103096561B (en) * 2011-10-31 2015-06-10 英飞特电子(杭州)股份有限公司 Constant current driver of light emitting diode (LED) light source
US9398665B2 (en) 2011-10-31 2016-07-19 Inventronics (Hangzhou), Inc. Constant current drive for LED light source
CN102685990A (en) * 2012-05-23 2012-09-19 沈阳新一代信息技术有限公司 Dimmable tunnel LED (Light-Emitting Diode) illumination energy-saving control system and method
CN106301012A (en) * 2015-12-25 2017-01-04 厦门宏合自动化设备有限公司 A kind of electric operation power reduces power-supply system and the method for input stand-by power consumption

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