CN211378325U - LED driving power supply based on CWA ballast - Google Patents
LED driving power supply based on CWA ballast Download PDFInfo
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- CN211378325U CN211378325U CN202020192781.XU CN202020192781U CN211378325U CN 211378325 U CN211378325 U CN 211378325U CN 202020192781 U CN202020192781 U CN 202020192781U CN 211378325 U CN211378325 U CN 211378325U
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Abstract
The utility model relates to a LED drive power supply based on CWA ballast, including a CWA ballast 1, a compensation electric capacity 2, a rectifier bridge 3, a flat wave electric capacity 4, the power input end of CWA ballast 1 links to each other with alternating current power supply, CWA ballast 1's output with compensation electric capacity 2 establishes ties the back, with rectifier bridge 3's alternating current input end links to each other, rectifier bridge 3's direct current output end is parallelly connected with flat wave electric capacity 4, and is parallelly connected with driven LED banks again. The self-healing lamp has the advantages of low cost, high reliability, super-long service life, strong lightning resistance, self-healing capability, capability of utilizing scrapped element resources, capability of utilizing scrapped lamp ballasts, reduction of power grid loss, no electromagnetic interference, simple and environment-friendly production process, strong power supply voltage fluctuation resistance and the like.
Description
Technical Field
The utility model relates to a LED drive circuit, in particular to LED illumination drive circuit based on CWA ballast.
Background
The LED light source has long service life and high lighting effect, can adjust light in a large range, and the LED lighting technology is expected to replace the traditional gas discharge lamp and incandescent lamp as a green lighting technology, thereby saving a large amount of energy for the society. The LED is a device with constant voltage characteristic, and a driving circuit is required to be used when commercial power is used for supplying power, however, as for several driving circuits in the prior art, the defects exist, so that the popularization of an LED light source in the field of illumination is influenced, particularly in the field of high-power outdoor or industrial and mining illumination, the market share of LED illumination is not more than 20% so far, and various researches show that the bottleneck of service life reliability of the driving power source is the most fundamental reason for restricting the development of the driving power source.
The most commonly used LED mains driving circuits in the prior art mainly include 3 types: the first is a resistance-capacitance driving circuit, which utilizes the capacitive reactance of a capacitor to step down and limit the current of the alternating voltage of the commercial power and provide a relatively stable current for the connected LED lamp string. The second is a linear constant current driving circuit, which limits the LED current by using a constant current diode device, and has the advantages of low cost and small volume, however, since a resistive element is used as a current limiting device, the efficiency is low, the heat generation is large, the energy saving advantage of the LED light source cannot be exerted, and the high power is difficult to realize. The third type is a high-frequency switching power supply circuit, the control method and the topological structure of the circuit are various, and the circuit has the advantages of high efficiency and good constant current characteristic, but the circuit has a complex structure, the number of elements is as many as 30-60, the lightning protection capability is poor, the reliability and the service life are poor, the actual service life is only 2-4 years, the circuit is used for indoor illumination without problems, but the circuit is used for high-power outdoor or industrial and mining illumination, and the user generally reflects short service life and high early failure rate due to the severe working environment.
With the rapid development of the LED technology, the market penetration rate of the current LED illumination is nearly 50%, a large number of traditional incandescent lamps and energy-saving lamps are replaced by LED light sources, however, in the field of high-power outdoor illumination, the market acceptance of the LED is generally low, and the traditional gas discharge light source still occupies the mainstream, so that the energy-saving progress in the field of high-power outdoor illumination is slow. Therefore, the development of a high-power LED driving circuit with high reliability and long service life is of great significance.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem that prior art exists, provide a novel LED constant current drive circuit, can effectively overcome prior art's short slab, possess that the constant current is effectual, the reliability is high, longe-lived, with low costs, impact current is little, the outstanding advantage that power factor is high.
The utility model discloses a multilayer ceramic electric capacity LED constant current drive circuit, based on the CWA ballast, it includes a CWA ballast 1, a compensation electric capacity 2, a rectifier bridge 3, a flat wave electric capacity 4, the power input end of CWA ballast 1 links to each other with alternating current power supply, CWA ballast 1's output with compensation electric capacity 2 establishes ties the back, with rectifier bridge 3's alternating current input end links to each other, rectifier bridge 3's direct current output end is parallelly connected with flat wave electric capacity 4, and is parallelly connected with driven LED banks again.
Preferably, the CWA ballast is a standard metal halide leading peak type inductive ballast, and a discharge resistor is connected in parallel between the compensation capacitor 2 and the smoothing capacitor 4. The compensation capacitor 2 is formed by connecting a thin film capacitor or a thin film capacitor and a ceramic capacitor in series or in parallel. The compensation capacitor 2, the rectifier bridge 3 and the flat wave capacitor 4 are arranged inside the heat conduction shell, and the heat conduction shell is in contact with an iron core of the CWA ballast.
The beneficial effects of the utility model reside in that:
1. the cost is low: the utility model discloses ingenious CWA ballast who has utilized current metal halide lamp utilizes its self better constant current characteristic, has realized LED's electric current accurate control function with extremely simple passive circuit, has avoided the use of active devices such as chip, transistor, therefore the cost is only the fraction of prior art switching power supply constant current scheme. Compare with the technical scheme who adopts ceramic capacitor to realize the constant current, the utility model discloses utilize CWA ballast self volt-ampere characteristic to realize the constant current, it is little to have avoided single capacity of ceramic capacitor, needs printed circuit board's shortcoming, and further reduce cost can compare current ceramic capacitor's scheme, has overcome printed circuit board ageing and sealed dampproofing problem under adverse circumstances simultaneously.
2. The reliability is high: the whole circuit is completely composed of passive devices such as an inductor, a capacitor and a rectifier bridge, the product stability can be effectively improved, the adaptability to severe environments such as high temperature and humidity is greatly improved, the inherent firmness and durability characteristics of the circuit can bring extremely high reliability and long service life durability under the severe environments of outdoor sun, rain and lightning impact, and experiments prove that the early failure rate of the circuit can reach 0.2 per thousand and is less than one tenth of that of a switching power supply in the prior art.
3. Strong lightning resistance: because passive device's thunder and lightning invasion ripples, heavy current stress endurance are far higher than active semiconductor device, the utility model discloses a resistant thunder performance is far higher than prior art switching power supply, the special method that connects of cooperation iron core inductance, the utility model discloses can reach prior art tens of times's comprehensive lightning protection performance, the annual cumulative failure rate that many thunder areas used can be less than thousandths.
4. The self-healing capability is provided: the utility model is essentially characterized in that the alternating current is directly controlled by adopting the capacitor and inductor series circuit which can automatically change impedance to keep the LED current constant, under the most unfavorable condition, if the capacitor breakdown or the internal short circuit of the ballast occurs, as long as the parameter selection of the resistance-capacitance element is reasonable, the impedance element parameter change and the current control capability of the LED lamp bank only controlling the current are reduced, the LED lamp bank still can maintain the luminous illumination, only the brightness or the stroboscopic index is reduced, therefore, the utility model also has the ingenious fault self-healing capability, when the main element is broken down and damaged, the lamp bank still can emit the luminous illumination, however, the switch power supply in the prior art only damages one dozens of elements, the whole lamp is usually extinguished and failed immediately, therefore, the utility model has extremely low fault rate, and is adopted in the high tower illumination occasions with difficult maintenance such as highways, airports, mine railways and the like, the maintenance and repair cost can be greatly reduced.
5. The recyclable light source electric appliance comprises: along with a large amount of LED energy-conservation transformation in recent years, a large amount of inductive ballast are abandoned, and inductive ballast stable performance itself, life-span are extremely long, the utility model discloses a but iron core inductance direct utilization gas discharge lamp's CWA inductive ballast, like this, but a large amount of inductive ballast reuse by abandonment originally has not only saved non ferrous metal resources such as a large amount of indisputable copper, can also constitute LED energy-conservation transformation, old and useless light source electrical apparatus regeneration, has further exerted the utility model discloses an environmental protection benefit.
6. Ultra-long service life: the utility model discloses the passive device that adopts, self ageing speed is extremely slow, the performance decay is not obvious, including simple structure, can reach very long life-span, even adopt electrolytic capacitor filtering, because the utility model discloses electrolytic capacitor only is used for improving the stroboscopic, even withered inefficacy circuit also can move as usual, LED also can continue luminous illumination, has obvious overlength life-span for hundreds of thousands of hours, is 5-10 times of prior art switching power supply.
7. And (3) reducing the power grid loss: the utility model discloses can provide perception reactive power for the electric wire netting voluntarily, account for about 5-20% of lamps and lanterns active power, can realize certain reactive power compensation to the electric wire netting to reduce the electric wire netting line loss, stabilize the electric wire netting voltage, produce indirect energy-conserving benefit.
8. No electromagnetic interference exists: the switch power class drive power supply of prior art, electromagnetic interference is more serious, even adopted good EMI filter circuit, still has a small amount of electromagnetic interference to leak, to special illumination occasions such as military affairs, scientific research, medical treatment, electromagnetic interference produces great influence easily, the utility model relates to a simple impedance circuit, work in the power frequency state, its current-voltage all is continuous power frequency positive ripple or more steady direct current, need not EMI filter circuit and also can not produce any interference to sensitive equipment.
9. The production process is simple and environment-friendly: the utility model discloses there is not active control circuit, production assembly technique is simple, the test is simple, because of the tightness of passive device, the circuit need not the encapsulating, the casing need not to consider sealed heat dissipation, has simplified production technology, has also reduced the dampproofing chemical solvent who causes of the indispensable encapsulating of prior art and has discharged the pollution.
10. The power supply voltage fluctuation tolerance is extremely strong: prior art switching power supply voltage surpasses 265V and will lead to damaging, and china's street lamp supply voltage quality is generally not high, and the voltage surpasses 270V often to take place late at night, leads to frequent damage of LED street lamp, and the utility model discloses can bear nearly 300V's voltage with the help of the outstanding compressive property of ceramic capacitor and not damage.
11. No impact current, and the flash operation: the starting impact current of the reactor is less than 2 times of the rated current and is one tenth of that of a switching power supply in the prior art due to the extremely simple impedance current-limiting principle and the current-limiting effect of the iron core reactor, so that the control contactor is not easy to damage due to centralized starting, the voltage of a power grid is not sunken, the reactor can directly flicker and operate intermittently, and the reactor is used for replacing incandescent lamps in occasions such as signal lamps, barrier lamps and the like to obtain a remarkable energy-saving effect.
12. No power decay, prior art adopt ceramic capacitor to realize the LED constant current, but class II ceramic capacitor has the capacity decay characteristic, after the power operation about 10 years, ceramic electrostatic capacitance value will descend about 10% for the illuminating effect descends, the utility model discloses can be without ceramic capacitor, thereby avoided long-term operation's power decay, further prolonged effective life.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of an embodiment of the LED constant current driving circuit of the present invention;
Detailed Description
Referring to fig. 1, a circuit diagram of an embodiment of the present invention is that a multilayer ceramic capacitor and an iron core inductor are connected in series between an ac power supply and an LED lamp set, however, the simple circuit creatively obtains a series of advantages that complicated active control circuits are difficult to reach through ingenious combination and type selection of components.
The CWA ballast has good current control performance, has the advantages of strong voltage fluctuation resistance and small output current change during voltage change in the application field of high-power metal halide lamps, and can obviously prolong the service life of the driven metal halide lamp light source. LED's essence is a single-phase conductive device who is fit for the current source environment, compares with gas discharge light sources such as metal halide lamp, only lies in the requirement difference of power polarity, consequently, the utility model discloses based on this, insert the rectifier bridge through the output at the CWA ballast, convert the steady alternating current of CWA ballast output into direct current, through the level and smooth of flat wave electric capacity, just can form the current source environment that is fit for the LED operation, realize LED's steady operation. The utility model discloses a compensation electric capacity is the running capacitance who forms a complete set with the CWA ballast originally, the utility model discloses can utilize existing CWA ballast and supporting compensation electric capacity completely, realize the drive of LED light source.
The compensation capacitor of the embodiment can be combined with the ceramic capacitor, because the ceramic capacitor has the characteristic that the capacitive reactance decreases along with the increase of voltage, the whole group of compensation capacitors can have the variable volt-ampere characteristic by utilizing the serial connection or the parallel connection of the thin film capacitor with better linearity and the ceramic capacitor, and when the input voltage rises and the output current increases, the capacitive reactance of the compensation capacitor increases, so that the output current decreases, and the constant current characteristic is further improved.
The beneficial effect of this embodiment lies in:
the cost is low: the utility model discloses ingenious CWA ballast who has utilized current metal halide lamp utilizes its self better constant current characteristic, has realized LED's electric current accurate control function with extremely simple passive circuit, has avoided the use of active devices such as chip, transistor, therefore the cost is only the fraction of prior art switching power supply constant current scheme. Compare with the technical scheme who adopts ceramic capacitor to realize the constant current, the utility model discloses utilize CWA ballast self volt-ampere characteristic to realize the constant current, it is little to have avoided single capacity of ceramic capacitor, needs printed circuit board's shortcoming, and further reduce cost can compare current ceramic capacitor's scheme, has overcome printed circuit board ageing and sealed dampproofing problem under adverse circumstances simultaneously.
The reliability is high: the whole circuit is completely composed of passive devices such as an inductor, a capacitor and a rectifier bridge, the product stability can be effectively improved, the adaptability to severe environments such as high temperature and humidity is greatly improved, the inherent firmness and durability characteristics of the circuit can bring extremely high reliability and long service life durability under the severe environments of outdoor sun, rain and lightning impact, and experiments prove that the early failure rate of the circuit can reach 0.2 per thousand and is less than one tenth of that of a switching power supply in the prior art.
Strong lightning resistance: because passive device's thunder and lightning invasion ripples, heavy current stress endurance are far higher than active semiconductor device, the utility model discloses a resistant thunder performance is far higher than prior art switching power supply, the special method that connects of cooperation iron core inductance, the utility model discloses can reach prior art tens of times's comprehensive lightning protection performance, the annual cumulative failure rate that many thunder areas used can be less than thousandths.
The self-healing capability is provided: the utility model is essentially characterized in that the alternating current is directly controlled by adopting the capacitor and inductor series circuit which can automatically change impedance to keep the LED current constant, under the most unfavorable condition, if the capacitor breakdown or the internal short circuit of the ballast occurs, as long as the parameter selection of the resistance-capacitance element is reasonable, the impedance element parameter change and the current control capability of the LED lamp bank only controlling the current are reduced, the LED lamp bank still can maintain the luminous illumination, only the brightness or the stroboscopic index is reduced, therefore, the utility model also has the ingenious fault self-healing capability, when the main element is broken down and damaged, the lamp bank still can emit the luminous illumination, however, the switch power supply in the prior art only damages one dozens of elements, the whole lamp is usually extinguished and failed immediately, therefore, the utility model has extremely low fault rate, and is adopted in the high tower illumination occasions with difficult maintenance such as highways, airports, mine railways and the like, the maintenance and repair cost can be greatly reduced.
The recyclable light source electric appliance comprises: along with a large amount of LED energy-conservation transformation in recent years, a large amount of inductive ballast are abandoned, and inductive ballast stable performance itself, life-span are extremely long, the utility model discloses a but iron core inductance direct utilization gas discharge lamp's CWA inductive ballast, like this, but a large amount of inductive ballast reuse by abandonment originally has not only saved non ferrous metal resources such as a large amount of indisputable copper, can also constitute LED energy-conservation transformation, old and useless light source electrical apparatus regeneration, has further exerted the utility model discloses an environmental protection benefit.
Ultra-long service life: the utility model discloses the passive device that adopts, self ageing speed is extremely slow, the performance decay is not obvious, including simple structure, can reach very long life-span, even adopt electrolytic capacitor filtering, because the utility model discloses electrolytic capacitor only is used for improving the stroboscopic, even withered inefficacy circuit also can move as usual, LED also can continue luminous illumination, has obvious overlength life-span for hundreds of thousands of hours, is 5-10 times of prior art switching power supply.
And (3) reducing the power grid loss: the utility model discloses can provide perception reactive power for the electric wire netting voluntarily, account for about 5-20% of lamps and lanterns active power, can realize certain reactive power compensation to the electric wire netting to reduce the electric wire netting line loss, stabilize the electric wire netting voltage, produce indirect energy-conserving benefit.
No electromagnetic interference exists: the switch power class drive power supply of prior art, electromagnetic interference is more serious, even adopted good EMI filter circuit, still has a small amount of electromagnetic interference to leak, to special illumination occasions such as military affairs, scientific research, medical treatment, electromagnetic interference produces great influence easily, the utility model relates to a simple impedance circuit, work in the power frequency state, its current-voltage all is continuous power frequency positive ripple or more steady direct current, need not EMI filter circuit and also can not produce any interference to sensitive equipment.
The production process is simple and environment-friendly: the utility model discloses there is not active control circuit, production assembly technique is simple, the test is simple, because of the tightness of passive device, the circuit need not the encapsulating, the casing need not to consider sealed heat dissipation, has simplified production technology, has also reduced the dampproofing chemical solvent who causes of the indispensable encapsulating of prior art and has discharged the pollution.
The power supply voltage fluctuation tolerance is extremely strong: prior art switching power supply voltage surpasses 265V and will lead to damaging, and china's street lamp supply voltage quality is generally not high, and the voltage surpasses 270V often to take place late at night, leads to frequent damage of LED street lamp, and the utility model discloses can bear nearly 300V's voltage with the help of the outstanding compressive property of ceramic capacitor and not damage.
No impact current, and the flash operation: the starting impact current of the reactor is less than 2 times of the rated current and is one tenth of that of a switching power supply in the prior art due to the extremely simple impedance current-limiting principle and the current-limiting effect of the iron core reactor, so that the control contactor is not easy to damage due to centralized starting, the voltage of a power grid is not sunken, the reactor can directly flicker and operate intermittently, and the reactor is used for replacing incandescent lamps in occasions such as signal lamps, barrier lamps and the like to obtain a remarkable energy-saving effect.
No power decay, prior art adopt ceramic capacitor to realize the LED constant current, but class II ceramic capacitor has the capacity decay characteristic, after the power operation about 10 years, ceramic electrostatic capacitance value will descend about 10% for the illuminating effect descends, the utility model discloses can be without ceramic capacitor, thereby avoided long-term operation's power decay, further prolonged effective life.
It should be noted that the above-mentioned embodiments are for illustrating the present invention and not for limiting the present invention, many technical features of the different embodiments of the present invention can be interchanged or omitted, and the parameter settings of many elements can be changed as required; many conventional circuit components also can add to as required in the utility model discloses in, for example the condenser both ends add overvoltage protection device, and the input adds lightning protection overvoltage protection device etc. the utility model discloses "one" or "one" before the component do not exclude a plurality of these kinds of components of appearance, and the technical staff in the field can be understood completely the utility model discloses technical characteristics and principle combine prior art to make a large amount of about on the basis the utility model discloses a change design, these all should belong to the utility model discloses a protection scope.
Claims (5)
1. The LED driving power supply based on the CWA ballast is characterized by comprising a CWA ballast (1), a compensation capacitor (2), a rectifier bridge (3) and a flat wave capacitor (4), wherein a power supply input end of the CWA ballast (1) is connected with an alternating current power supply, an output end of the CWA ballast (1) is connected with the compensation capacitor (2) in series and then connected with an alternating current input end of the rectifier bridge (3), and a direct current output end of the rectifier bridge (3) is connected with the flat wave capacitor (4) in parallel and then connected with a driven LED lamp bank in parallel.
2. The CWA ballast-based LED driver power supply of claim 1, wherein the CWA ballast is a standard metal halide advanced top-peak inductive ballast.
3. The CWA ballast-based LED driving power supply according to claim 1, wherein a discharge resistor is connected in parallel between the compensation capacitor (2) and the smoothing capacitor (4).
4. The CWA ballast-based LED driving power supply according to claim 1, wherein the compensation capacitor (2) is composed of a thin film capacitor or a thin film capacitor and a ceramic capacitor connected in series or in parallel.
5. The CWA ballast-based LED driving power supply according to claim 1, wherein the compensation capacitor (2), the rectifier bridge (3) and the flat wave capacitor (4) are installed inside a heat-conducting shell, and the heat-conducting shell is in contact with an iron core of the CWA ballast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020192781.XU CN211378325U (en) | 2020-02-21 | 2020-02-21 | LED driving power supply based on CWA ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020192781.XU CN211378325U (en) | 2020-02-21 | 2020-02-21 | LED driving power supply based on CWA ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211378325U true CN211378325U (en) | 2020-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020192781.XU Active CN211378325U (en) | 2020-02-21 | 2020-02-21 | LED driving power supply based on CWA ballast |
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| Country | Link |
|---|---|
| CN (1) | CN211378325U (en) |
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2020
- 2020-02-21 CN CN202020192781.XU patent/CN211378325U/en active Active
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