CN102595717B - Protection circuit of light-emitting diode (LED) lamp driving power supply and LED lamp driving power supply - Google Patents
Protection circuit of light-emitting diode (LED) lamp driving power supply and LED lamp driving power supply Download PDFInfo
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- CN102595717B CN102595717B CN201210017167XA CN201210017167A CN102595717B CN 102595717 B CN102595717 B CN 102595717B CN 201210017167X A CN201210017167X A CN 201210017167XA CN 201210017167 A CN201210017167 A CN 201210017167A CN 102595717 B CN102595717 B CN 102595717B
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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
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Abstract
The invention discloses a protection circuit of a light-emitting diode (LED) lamp driving power supply. The protection circuit comprises a temperature detection unit and a feedback control unit, wherein the temperature detection unit takes a negative temperature coefficient resistor as a temperature monitoring point, and transforms a temperature change into a voltage change to be transmitted to the feedback control unit; and the feedback control unit is connected between an output end of the LED lamp driving power supply and a pulse-width modulation (PWM) module to transmit a feedback signal back to a control end of the PWM module of the LED lamp driving power supply. The invention further discloses an LED lamp driving power supply, wherein the power supply comprises the protection circuit of the LED lamp driving power supply. The protection circuit of the LED lamp driving power supply is simple in circuit structure, low in cost and more precise in real-time control, and can effectively prevent circuits and LED lamps from emitting heat continuously; the output end of the LED lamp driving power supply is serially connected with a positive temperature coefficient resistor; the LED lamps can be prevented from being burned even when the power supply is in short circuit; and higher safety is provided.
Description
Technical field
The present invention relates to the LED power technique fields, be specifically related to LED lamp driving power source protective circuit and LED lamp driving power source.
Background technology
Tradition band PFC(Power Factor Correction power factor circuit) the LED driving power of function, adopt two transformers to realize usually.Special IC that boosts of a matched transformer completes and boosts; The special PWM chip of another matched transformer is responsible for voltage transitions.The circuit of this framework, not only exist number of elements many, the problem that cost is high, and take PCB(Printed circuit board printed circuit board) the large problem in space particularly highlights, can't be need to the application of the explosion-proof lamp field in less cavity by on-chip power; To the occasion of limited space system, also exist the implacable problem of safety safe distance requirement simultaneously.
Traditional single-stage PFC architecture design and the LED driving power of production, adopt single transformer to complete Active Power Factor Correction APFC(Active Power Factor Correction) and voltage transformation, it is on the low side that ubiquity power factor PF, higher and the not high phenomenon of constant current accuracy of total harmonic distortion THD (total harmonic distortion), be difficult to accomplish full voltage 85V-265VAC reliable operation, and be everlasting input high pressure 220V or when above switching on and shutting down easily cause power supply to damage.Particularly its short-circuit protection and overheat protector function imperfection, in use very easily damage the LED driving power, and some loop power supply out of control even can burn out light fixture.In process of production, the open loop phenomenon can cause the output voltage electric current uncontrollable, damages the elements such as electrochemical capacitor, causes unnecessary waste.
Summary of the invention
The invention provides a kind of LED lamp driving power source protective circuit, can solve the problem of overheat protector and the short-circuit protection of LED lamp driving power source.
The invention provides a kind of LED lamp driving power source protective circuit, comprising:
Temperature detecting unit, temperature detecting unit comprises negative temperature coefficient resister RT, divider resistance R32, voltage-stabiliser tube Z4 and diode D6, wherein, negative temperature coefficient resister RT connects with divider resistance R32, the other end of negative temperature coefficient resister RT is connected to the voltage output end with burning voltage output, the other end of divider resistance R32 is connected to equipment ground, the negative electrode of voltage-stabiliser tube Z4 is connected in the series connection point of negative temperature coefficient resister RT and divider resistance R32, the anode of the anodic bonding diode D6 of voltage-stabiliser tube Z4, the negative electrode of diode D6 connects feedback control unit;
Feedback control unit, be connected between the output and PWM module of LED lamp driving power source, for feedback signal being transmitted back to the PWM module of LED lamp driving power source.
Preferably, described protective circuit also comprises a positive temperature coefficient resistor PTC, and positive temperature coefficient resistor PTC is serially connected in the output of LED lamp driving power source.
Preferably, the described voltage output end with burning voltage output is realized jointly by resistance R 26, capacitor C 13, voltage-stabiliser tube Z3, wherein, capacitor C 13 is in parallel with voltage-stabiliser tube Z3, resistance R 26 is connected between LED lamp driving power source output and capacitor C 13 and voltage-stabiliser tube Z3 in parallel, the equal connection device of the other end ground of capacitor C 13 and voltage-stabiliser tube Z3, the negative electrode of voltage-stabiliser tube Z3 is as voltage output end.
Preferably, described FEEDBACK CONTROL power supply comprises control chip U2, voltage sample resistance, current sampling resistor and optocoupler, control chip U2 obtains magnitude of voltage and the current value of current output by voltage sample resistance and current sampling resistor respectively from the output of LED lamp driving power source, control chip transmits back feedback signal the PWM module of LED lamp driving power source through optocoupler.
Technique scheme can be found out, because temperature detecting unit in the embodiment of the present invention only adopts negative temperature coefficient resister, temperature is carried out to sensing, change in voltage is transferred to feedback control unit through voltage-stabiliser tube, circuit structure is simple, cost is low, and the change in voltage caused by variations in temperature can be transmitted back the PWM module of LED lamp driving power source in time by feedback control unit, having real-time more accurately controls, can effectively prevent the continuous heating of circuit and LED light fixture, and in protective circuit of the present invention, the output serial connection positive temperature coefficient resistor of LED lamp driving power source, avoided further output current excessive, especially the electric current excessive impact to the LED light fixture of moment during short circuit, can effectively guarantee that the LED light fixture is not burnt in time when short circuit yet, there is higher fail safe.
The present invention also provides a kind of LED lamp driving power source, and this power supply comprises above-mentioned LED lamp driving power source protective circuit.
Use the LED lamp driving power source of above-mentioned protective circuit to there is safer, stable performance in Power Operating Process.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit theory diagrams of LED lamp driving power source protective circuit in the embodiment of the present invention 1;
Fig. 2 is the circuit theory diagrams that have the voltage output end of burning voltage output in the embodiment of the present invention 1 in LED lamp driving power source protective circuit;
Fig. 3 is the circuit theory diagrams of LED lamp driving power source protective circuit in the embodiment of the present invention 2;
Fig. 4 is the circuit theory diagrams of LED lamp driving power source in the embodiment of the present invention 3.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making all other embodiment that obtain under the creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
As shown in Figure 1, the embodiment of the present invention provides a kind of LED lamp driving power source protective circuit, comprising:
Temperature detecting unit, temperature detecting unit comprises negative temperature coefficient resister RT, divider resistance R32, voltage-stabiliser tube Z4 and diode D6, wherein, negative temperature coefficient resister RT connects with divider resistance R32, the other end of negative temperature coefficient resister RT (Port end) is connected to the voltage output end with burning voltage output, the other end of divider resistance R32 is connected to equipment ground GND, the negative electrode of voltage-stabiliser tube Z4 is connected in the series connection point of negative temperature coefficient resister RT and divider resistance R32, the anode of the anodic bonding diode D6 of voltage-stabiliser tube Z4, the negative electrode of diode D6 connects feedback control unit,
Feedback control unit, be connected between the output and PWM module of LED lamp driving power source, for feedback signal being transmitted back to the PWM module of LED lamp driving power source.
Particularly, as shown in Figure 2, the described voltage output end with burning voltage output is realized jointly by resistance R 26, capacitor C 13, voltage-stabiliser tube Z3, wherein, capacitor C 13 is in parallel with voltage-stabiliser tube Z3, resistance R 26 is connected to the point in parallel of LED lamp driving power source output and capacitor C 13 and voltage-stabiliser tube Z3, and resistance R 26 is connected to the equal connection device of the other end ground of LED lamp driving power source output and capacitor C 13 and voltage-stabiliser tube Z3, and the negative electrode of voltage-stabiliser tube Z3 is as voltage output end (being that Port holds).
Below in conjunction with Fig. 1, Fig. 2, the operation principle of the LED lamp driving power source protective circuit in the embodiment of the present invention is made to concrete introduction.
At first, negative temperature coefficient resister RT is as the temperature monitoring point of this protective circuit, negative temperature coefficient resister RT is arranged on to the heat dissipation equipment place of LED light fixture or heat radiation place of driving power, and negative temperature coefficient resister RT just can be in time detected the temperature of LED light fixture or driving power like this, be understandable that, when the electric current of exporting in driving power increases, the LED light fixture of driving power itself and driven Power supply all can cause heating due to the lifting of electric current, monitoring when guaranteeing the temperature to driving power and LED light fixture, two negative temperature coefficient resisters are set in temperature detecting unit, two negative temperature coefficient resister series connection, then be connected in Fig. 1 between divider resistance R32 and Port end, the negative temperature coefficient resister that is equivalent to the negative temperature coefficient resister RT in Fig. 1 is split into two series connection is connected in circuit, one of them negative temperature coefficient resister is arranged on heat radiation place of driving power, as the point of the monitoring temperature in driving power, another negative temperature coefficient resister is arranged on the heat abstractor place of LED light fixture, monitoring temperature point as the LED light fixture.
Due to the output at the LED lamp driving power source (LED+ end) by resistance R 26 by voltage distribution to voltage-stabiliser tube Z3, the interference signal of capacitor C 13 in can the filtering circuit, prevent the interference of interference signal to negative temperature coefficient resister RT, negative electrode at voltage-stabiliser tube Z3 can obtain stable Voltage-output, and burning voltage is held and exported negative temperature coefficient resister RT to by Port, therefore, when negative temperature coefficient resister RT senses the temperature rising of driving power or LED light fixture, the resistance of negative temperature coefficient resister RT can reduce, thereby the dividing potential drop on negative temperature coefficient resister RT also reduces thereupon, dividing potential drop on the divider resistance R32 of series connection increases thereupon with it, after voltage on divider resistance R32 is greater than the puncture voltage of voltage-stabiliser tube Z4, voltage-stabiliser tube Z4 is breakdown, dividing potential drop on divider resistance R32 just transfers to feedback control unit through voltage-stabiliser tube Z4 and diode D6, choosing of the reverse breakdown voltage value of voltage-stabiliser tube Z4 is corresponding with the protection value of temperature detection, if the reverse breakdown voltage value of voltage-stabiliser tube Z4 higher for the temperature protection value of driving power choose higher, diode D6 can prevent voltage or current flowing backwards degree of the rising again detecting unit of connected feedback control unit, All other routes are impacted, be understandable that, feedback control unit is connected with the PWM module of LED lamp driving power source, after feedback control unit receives the change in voltage on temperature detecting unit, change in voltage on the feedback control unit temperature detecting unit is converted into the PWM module that corresponding feedback signal transfers to the LED lamp driving power source, the PWM module, through relatively inner, is adjusted the output voltage of LED lamp driving power source.
In the embodiment of the present invention, the protective circuit of LED lamp driving power source has only adopted negative temperature coefficient resister RT as temperature detecting point; and with the height of voltage-stabiliser tube Z4 limit temperature detected value; with respect to existing driving power protective circuit; the device used greatly reduces; simple in structure being easy to realized; and by feedback control unit, variations in temperature is converted into to the PWM module that change in voltage is transmitted back driving power, and further utilized feedback control unit, improved the utilance of device.
Embodiment 2:
As shown in Figure 3, in the embodiment of the present invention, LED lamp driving power source protective circuit also comprises a positive temperature coefficient resistor PTC, and positive temperature coefficient resistor PTC is serially connected in the output (LED+ end) of LED lamp driving power source.When the output of LED lamp driving power source is short-circuited, can produce larger curent change at the LED+ end, electric current can draw high rapidly, and existing LED lamp driving power source adopts feedback control unit to be detected output more, being feedback control unit carries out current sample by current sampling resistor to the output of LED lamp driving power source, when output end current is excessive, feedback control unit obtains current changing signal from current sampling resistor, and feed back to the PWM module of LED lamp driving power source, by the PWM module to the output of power supply make adjustment (closing working power), but, this control mode has certain hysteresis quality, that output has produced large electric current and just carries out FEEDBACK CONTROL, be unfavorable for very first time protection LED light fixture, therefore, the embodiment of the present invention is at output (LED+ end) the serial connection positive temperature coefficient resistor PTC of LED lamp driving power source, when the LED+ end produces larger electric current, during as short circuit current, electric current increases to 2～3 times of normal number at ordinary times, the electric current that now positive temperature coefficient resistor PTC flows through is 2～3 times of load current value, make positive temperature coefficient resistor PTC persistent fever cause himself resistance rising, and then short circuit current descends and keeps high-impedance state always.After the unshorting phenomenon, the LED lamp driving power source can work again, even the PWM module of the signal back LED lamp driving power source that the LED lamp driving power source so in the embodiment of the present invention does not increase electric current in time at feedback control unit, positive temperature coefficient resistor PTC also can guarantee that the electric current of LED+ end drops to safe range in the very first time.
In the embodiment of the present invention, the FEEDBACK CONTROL power supply comprises control chip U2, voltage sample resistance, current sampling resistor and optocoupler, control chip U2 obtains magnitude of voltage and the current value of current output by voltage sample resistance and current sampling resistor respectively from the output of LED lamp driving power source, control chip transmits back feedback signal the control end of the PWM module of LED lamp driving power source through optocoupler.Particularly, as shown in Figure 3, R30, C16, R27, R23, R29 forms the constant current testing circuit, voltage sample resistance comprises R24, R25, dividing potential drop on resistance R 24 is transferred to control chip U2 as sampled voltage, R30, C16, R27, R23, R29 forms the constant current testing circuit, current sampling resistor R23, R27, R29 is converted to voltage transmission to control chip U2 by sample rate current, the voltage reference voltage inner with it that control chip U2 changes sampled voltage and/or sample rate current compares, and then the size of the voltage at the two ends, the former limit of optocoupler OP1 that are connected with control chip U2 of control, thereby realize the control to optocoupler OP1 secondary both end voltage, the final PWM module that realizes feedback signal is transmitted back the LED lamp driving power source.
In the embodiment of the present invention, LED lamp driving power source protective circuit is protected the LED lamp driving power source under the cooperation of temperature detecting unit 301, feedback control unit that the U2 of take is control chip and positive temperature coefficient resistor PTC; can realize overheat protector and short-circuit protection, make LED lamp driving power source safety and stability more.
Embodiment 3:
As shown in Figure 4, the LED lamp driving power source in the embodiment of the present invention comprises that voltage input circuit 401, rectification circuit 402, pwm control circuit 403, output rectification circuit 404, output constant current constant-voltage control circuit, short-circuit protection and thermal-shutdown circuit form.And having comprised above-described embodiment 1 or the described LED lamp driving power source of embodiment 2 protective circuit, output crossing current constant-voltage control circuit is realized with feedback control circuit in above-described embodiment, significant to the safe and stable operation of whole power supply.
In the input circuit assembly, increase piezo-resistance VR1 in case the surge in electrical network processed (Surge) surging damages the switch MOS pipe.Piezo-resistance VR1, when running into the interference of surge surging, can clamper arrive certain voltage levvl, avoids switch MOS pipe and IC element etc. to bear too high voltages and damages.
In rectification circuit, needing to add the CBB(polypropylene of a low capacity after rectifier bridge) electric capacity leaches clutter and anti-interference, need determine the filter capacitor capacity according to the Power Management Design power output, and reasonably the electric capacity value can effectively improve PF and antijamming capability.
Pwm chip adopts traditional CRM non-continuous mode boost control chip, by feed back to elementary PWM chip U1 internal comparator end with the secondary voltage current sampling, PWM chip U1 compares the sampling of input voltage waveform simultaneously, control output Gate voltage width and frequency to follow the tracks of input voltage waveform, and control switch metal-oxide-semiconductor break-make, make transformer by certain frequency and pulsewidth work, and then the voltage coupling is outputed to secondary transformer, and just can the driving LED load after rectification, form have PF proofread and correct again can voltage of transformation circuit.
As shown in Figure 4, the LED lamp driving power source in the embodiment of the present invention adopts implements 2 described LED lamp driving power source protective circuits, and overheat protector and the short-circuit protection of power supply are given security.
The single-stage PFC(Power Factor Correction power factor circuit that the embodiment of the present invention is released) the LED driving power of power supply structure design and production, adopt single transformer to complete active power factor calibration APFC(Active Power Factor Correction) and voltage transformation.Adopt a transformer just to realize power factor correction and voltage transformation, element is few, takies sky PCB space little, and power supply complete machine cost is low, and can process well safety and wait safely requirement.
Valuation Standard (the ENERGY STAR Program Requirements for Integral LED Lamps ENERGY STAR Eligibility Criteria of U.S.'s " Energy Star " to the LED driving power, 3,2009) regulation, power factor under civilian and commercial condition is not less than respectively 0.7 and 0.9, and this is to enter the unalterable quota that American market must reach.It is 99.6% that the LED driving power power factor of APFC power supply structure of the present invention reaches 0.996(), be better than U.S.'s " Energy Star " standard.
The above LED lamp driving power source protective circuit that the embodiment of the present invention is provided and LED lamp driving power source are described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention simultaneously.
Claims (5)
1.LED the lamp driving power source protective circuit, is characterized in that, comprising:
Temperature detecting unit, temperature detecting unit comprises negative temperature coefficient resister RT, divider resistance R32, voltage-stabiliser tube Z4 and diode D6, wherein, negative temperature coefficient resister RT connects with divider resistance R32, the other end of negative temperature coefficient resister RT is connected to the voltage output end with burning voltage output, the other end of divider resistance R32 is connected to equipment ground, the negative electrode of voltage-stabiliser tube Z4 is connected in the series connection point of negative temperature coefficient resister RT and divider resistance R32, the anode of the anodic bonding diode D6 of voltage-stabiliser tube Z4, the negative electrode of diode D6 connects feedback control unit;
Feedback control unit, be connected between the output and PWM module of LED lamp driving power source, for feedback signal being transmitted back to the PWM module of LED lamp driving power source.
2. LED lamp driving power source protective circuit as claimed in claim 1, it is characterized in that: described protective circuit also comprises a positive temperature coefficient resistor PTC, and positive temperature coefficient resistor PTC is serially connected in the output of LED lamp driving power source.
3. LED lamp driving power source protective circuit as claimed in claim 1; it is characterized in that: the described voltage output end with burning voltage output is realized jointly by resistance R 26, capacitor C 13, voltage-stabiliser tube Z3; wherein; capacitor C 13 is in parallel with voltage-stabiliser tube Z3; resistance R 26 is connected between LED lamp driving power source output and capacitor C 13 and voltage-stabiliser tube Z3 in parallel; the equal connection device of the other end ground of capacitor C 13 and voltage-stabiliser tube Z3, the negative electrode of voltage-stabiliser tube Z3 is as voltage output end.
4. as claim 1,2 or 3 described LED lamp driving power source protective circuits; it is characterized in that: described FEEDBACK CONTROL power supply comprises control chip U2, voltage sample resistance, current sampling resistor and optocoupler; control chip U2 obtains magnitude of voltage and the current value of current output by voltage sample resistance and current sampling resistor respectively from the output of LED lamp driving power source, control chip transmits back feedback signal the PWM module of LED lamp driving power source through optocoupler.
5.LED lamp driving power source is characterized in that: comprise LED lamp driving power source protective circuit as described as any one in claim 1 to 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210017167XA CN102595717B (en) | 2012-01-19 | 2012-01-19 | Protection circuit of light-emitting diode (LED) lamp driving power supply and LED lamp driving power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210017167XA CN102595717B (en) | 2012-01-19 | 2012-01-19 | Protection circuit of light-emitting diode (LED) lamp driving power supply and LED lamp driving power supply |
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| CN102595717A CN102595717A (en) | 2012-07-18 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104159358A (en) * | 2014-06-30 | 2014-11-19 | 青岛海信移动通信技术股份有限公司 | Electric torch drive circuit and mobile terminal |
| US9967939B2 (en) * | 2015-02-20 | 2018-05-08 | Hubbell Incorporated | Light emitting diode thermal foldback control device and method |
| CN108834264A (en) * | 2018-07-30 | 2018-11-16 | 中山市蓝德电子有限公司 | A kind of LED light strip driving circuit with automatic adjustment power |
| CN111865116B (en) * | 2019-04-26 | 2022-07-22 | 南京理工大学 | CRM boost converter with constant switching frequency based on variable inductor |
| CN110686800B (en) * | 2019-10-08 | 2024-07-02 | 陕西赛尔斯电子有限公司 | Thermosensitive sensor with temperature protection function |
| CN116471722B (en) * | 2023-04-11 | 2023-09-01 | 浙江雨林电子科技有限公司 | Intelligent detection and adjustment method and system for running state of LED driving power supply |
| CN117915520A (en) * | 2024-03-20 | 2024-04-19 | 珠海市圣昌电子有限公司 | High-precision load limiting control circuit and load limiting control method based on over-temperature protection curve |
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| CN2767820Y (en) * | 2004-11-23 | 2006-03-29 | 陈钦铭 | LED light-emitting apparatus |
| CN101681968A (en) * | 2007-05-31 | 2010-03-24 | 株式会社村田制作所 | Led driving circuit |
| CN202475865U (en) * | 2012-01-19 | 2012-10-03 | 李玉麟 | Protection circuit for LED lamp driving power supply, and LED lamp driving power supply |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2767820Y (en) * | 2004-11-23 | 2006-03-29 | 陈钦铭 | LED light-emitting apparatus |
| CN101681968A (en) * | 2007-05-31 | 2010-03-24 | 株式会社村田制作所 | Led driving circuit |
| CN202475865U (en) * | 2012-01-19 | 2012-10-03 | 李玉麟 | Protection circuit for LED lamp driving power supply, and LED lamp driving power supply |
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