CN204741593U - LED drive circuit of compatible sub - ballast of high frequency electric and low frequency input - Google Patents
LED drive circuit of compatible sub - ballast of high frequency electric and low frequency input Download PDFInfo
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- CN204741593U CN204741593U CN201520372467.9U CN201520372467U CN204741593U CN 204741593 U CN204741593 U CN 204741593U CN 201520372467 U CN201520372467 U CN 201520372467U CN 204741593 U CN204741593 U CN 204741593U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a LED drive circuit of compatible sub - ballast of high frequency electric and low frequency input, including first electric capacity, rectifier circuit, filter circuit and LED switch circuit, parallel connection is inputed to sub - ballast of first electric capacity and high frequency electric or low frequency, first electric capacity and rectifier circuit's input parallel connection, rectifier circuit's output and filter circuit parallel connection, filter circuit and LED switch circuit parallel connection, the utility model discloses with the output parallel connection of first electric capacity with the sub - ballast of high frequency electric, when the sub - ballast of high frequency electric starts, first electric capacity can act as earlier the load, produce resonance with the sub - ballast of high frequency electric, can avoid the sub - ballast of high frequency electric to vibrate the high pressure because of the empty load produces, play the effect of protection at the back to the circuit of connecting, through the ingenious start -up high pressure of having avoidd the sub - ballast of high frequency electric of parallelly connected first electric capacity, make LED switch circuit need not to consider that the front end starts highly compressed impact, and can not influence LED drive circuit's power factor.
Description
Technical field
The utility model relates to a kind of LED drive circuit, particularly relate to a kind of can compatible high frequency electric ballast and low frequency input LED drive circuit.
Background technology
Fluorescent lamp is as traditional fluorescent tube, respectively there is a filament at its two ends, inside is filled with the argon of trace and thin mercuryvapour, tube inner wall scribbles fluorescent material, ultraviolet is sent during gas conduction between two filaments, fluorescent material is made to send visible ray, because fluorescent lamp contains heavy metal pollutants " mercury ", make the fluorescent tube scrapped very serious to the pollution of environment, and semiconductor light sources (LED) to have light efficiency high, life-span is long, the advantages such as environmental protection, it replaces traditional lighting (as incandescent lamp, fluorescent lamp) gesture inevitable, but still there is a large amount of conventional fluorescent illuminations now, the electric ballast that fluorescent lamp uses also occupies very large market, in order to improve resource utilization, a kind of excessively product of market demand, this transitional product does not need to do any repacking to original light fixture, LED illumination can be made to directly apply in former electronic ballast for fluoresent lamp or Inductive ballast.
At present, compatible high frequency electric ballast LED drive circuit major part adopt be the high-voltage signal being reduced high-frequency electronic ballast by modes such as resistance-capacitance depressurizations, as shown in Figure 1, for the LED drive circuit of existing compatible high frequency electric ballast, the voltage signal of input is after electric capacity C1 dividing potential drop, through high-frequency rectification bridge, make LED switch circuit working and driving LED work.When accessing high-frequency electronic ballast, electric capacity C1 is when high-frequency electronic ballast starts, also the effect of step-down can be played, but high-frequency electronic ballast start but rear class LED drive start not yet completely during this period of time in, the zero load of high-frequency electronic ballast exports and will reach 500V to 1000V, electric capacity C1 just carries out dividing potential drop to the output voltage of high-frequency electronic ballast, when high-frequency electronic ballast starts, still a due to voltage spikes can be there is in the input of LED drive circuit, unloaded high pressure now can not be suppressed completely, still certain impact can be had even to damage to LED drive circuit, when being input as civil power, electric capacity C1 can drag down the overall power factor of integrated circuit greatly, causes circuit to be difficult to meet the requirement of high power factor, in visible prior art, capacitance decompression mode is that the capacitive reactance that utilizes electric capacity when high frequency and LED drive circuit carry out dividing potential drop, the object that LED drives input voltage is reduced to reach, the mode of capacitance decompression only reduces voltage ratio, the input voltage of LED drive circuit and the output voltage of high-frequency electronic ballast are directly proportional, and the decompression capacitor being connected on input will have an impact to the power factor (PF) of circuit, if LED switch circuit is without absorption circuit, ability does not live to start the impact of high pressure again, and appearance damage was even lost efficacy by whole LED switch circuit.So the LED drive circuit of a energy compatible high frequency electric ballast now need be designed, can not produce LED drive circuit and impact, and when inputting low frequency civil power, the power factor (PF) of described LED drive circuit also can not be influenced.
Utility model content
Technical problem to be solved in the utility model is, the LED drive circuit of a kind of compatible high frequency electric ballast and low frequency input is provided, can not produce LED drive circuit when input is high-frequency electronic ballast and impact, when inputting for low frequency, the power factor (PF) of LED drive circuit can not by the impact of input.
In order to solve the problems of the technologies described above, the utility model discloses the LED drive circuit of a kind of compatible high frequency electric ballast and low frequency input, comprise the first electric capacity, rectification circuit, filter circuit and LED switch circuit, described first electric capacity and high-frequency electronic ballast or low frequency input are connected in parallel, the input of described first electric capacity and rectification circuit is connected in parallel, output and the filter circuit of described rectification circuit are connected in parallel, and described filter circuit is connected with LED switch circuit in parallel.
As the preferred implementation of the LED drive circuit that a kind of compatible high frequency electric ballast of the utility model and low frequency input, described first electric capacity is metallized film safety electric capacity.
As the preferred implementation of the LED drive circuit that a kind of compatible high frequency electric ballast of the utility model and low frequency input, described rectification circuit is high-frequency rectification circuit.
As the preferred implementation of the LED drive circuit that a kind of compatible high frequency electric ballast of the utility model and low frequency input, described high-frequency rectification circuit is high frequency bridge rectifier, and described high frequency bridge rectifier is made up of four fast recovery diodes or four Ultrafast recovery diodes.
As the preferred implementation of the LED drive circuit that a kind of compatible high frequency electric ballast of the utility model and low frequency input, described filter circuit is filter capacitor, the output of described filter capacitor and rectification circuit is connected in parallel, and described LED switch circuit and filter capacitor are connected in parallel.
As the preferred implementation of the LED drive circuit that a kind of compatible high frequency electric ballast of the utility model and low frequency input, described filter capacitor is polypropylene capactive.
As the preferred implementation of the LED drive circuit that a kind of compatible high frequency electric ballast of the utility model and low frequency input, the capacity of described filter capacitor is greater than for 10nF-1uF.
As the preferred implementation of the LED drive circuit that a kind of compatible high frequency electric ballast of the utility model and low frequency input, the withstand voltage > 450V of described filter capacitor.
As the preferred implementation of the LED drive circuit that a kind of compatible high frequency electric ballast of the utility model and low frequency input, described LED switch circuit is power factor correction circuit.
Implement embodiment of the present utility model, there is following beneficial effect:
1, the output that first electric capacity and high-frequency electronic ballast or low frequency input is connected in parallel by the utility model, when accessing high-frequency electronic ballast, first electric capacity first can serve as load, resonance is produced with high-frequency electronic ballast, high-frequency electronic ballast can be avoided to shake high pressure because zero load produces, the circuit connected is played to the effect of protection below, the utility model has evaded the startup high pressure of high-frequency electronic ballast cleverly by the first electric capacity in parallel, make LED switch circuit without the need to considering the impact of frontal startup high pressure, and the power factor (PF) of LED drive circuit can not be affected, LED drive circuit can be made to reach high power factor requirement, LED drive circuit of the present utility model is also applicable to low frequency input, can the high power factor of realizing circuit,
2, rectification circuit of the present utility model adopts fast recovery diode or Ultrafast recovery diode, and the alternating current can effectively protecting rectification circuit, filter circuit and LED switch circuit can not export by high-frequency electronic ballast affects and damages.
Accompanying drawing explanation
Fig. 1 is the LED drive circuit of compatible high frequency electric ballast in prior art;
Fig. 2 is the LED drive circuit of the utility model access high-frequency electronic ballast;
Fig. 3 is the circuit diagram of the utility model access high-frequency electronic ballast.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the utility model is described in further detail.
See accompanying drawing 2 and accompanying drawing 3, the utility model provides the LED drive circuit of a kind of compatible high frequency electric ballast and low frequency input, comprise the first electric capacity C1, rectification circuit 1, filter circuit 2 and LED switch circuit 3, described first electric capacity C1 and high-frequency electronic ballast 4 or low frequency input are connected in parallel, the input of described first electric capacity C1 and rectification circuit 1 is connected in parallel, output and the filter circuit 2 of described rectification circuit 1 are connected in parallel, and described filter circuit 2 and LED switch circuit 3 are connected in parallel.
The output of the first electric capacity C1 and high-frequency electronic ballast 4 is connected in parallel by the utility model, when high-frequency electronic ballast 4 starts, first electric capacity C1 first can serve as starting load, resonance is produced with high-frequency electronic ballast 4, make LED drive circuit in startup during this period of time, high-frequency electronic ballast 4 can be avoided to shake high pressure and impacting with high pressure because starting unloaded generation, the circuit connected is played to the effect of protection below, the utility model has evaded the startup high pressure of high-frequency electronic ballast 4 cleverly by the first electric capacity C1 in parallel, make LED switch circuit 3 without the need to considering the impact of frontal startup high pressure, and the power factor (PF) of LED drive circuit can not be affected, LED drive circuit can be made to reach high power factor requirement, power factor (PF) when the utility model access low frequency civil power or low frequency inductance ballast is not by the impact for electric capacity C1, circuit of the present utility model is particularly useful for the high-frequency electronic ballast of U.S. rule.
When inputting for low frequency, first electric capacity C1 becomes the safety electric capacity of LED drive circuit, and preferably the first electric capacity C1 is metallized film safety electric capacity, is specifically as follows X electric capacity, it is withstand voltage reaches more than 1200V, and the first electric capacity C1 of described parallel connection can play the effect suppressing EMI interference.
As the optimal way of rectification circuit 1, described rectification circuit 1 is high-frequency rectification circuit, specifically select high frequency bridge rectifier, described high frequency bridge rectifier is made up of four fast recovery diodes or four Ultrafast recovery diode D1-D4, guarantee the stability of rectifier diode and LED drive circuit when accessing high-frequency electronic ballast, reduce because rectifier diode can not the power loss that causes of quick-recovery and element damage soon, effectively can protect rectification circuit, the alternating current that filter circuit and LED switch circuit can not export by high-frequency electronic ballast 4 affects and damages.
Filter circuit described in the utility model is filter capacitor C2, and the output of described filter capacitor C2 and rectification circuit is connected in parallel, and described LED switch circuit and filter capacitor C2 are connected in parallel.To the high power factor (being greater than 0.9) of realizing circuit, preferred filter capacitor C2 is polypropylene capactive, the amount of capacity of filter capacitor C2 is 10nF-1uF, the withstand voltage of described filter capacitor C2 is greater than 450V, filter capacitor C2 can choose capacitance size according to circuit own power factors dictate, if what filter capacitor C2 selected is electrochemical capacitor, then should choose the low damage electrolysis of high frequency, if power factor requirements is greater than 0.5 or do not do requirement, cake resistancet electric capacity C2 is according to the electrochemical capacitor of bearing power different choice different capabilities, and withstand voltage is at more than 450V; The capacity of Choose filtering electric capacity C2, can decide according to the framework of circuit and load parameter characteristic.
LED switch circuit described in the utility model can be power factor correction circuit, concrete can be passive type power factor correction circuit or active power factor correction circuit, the former front end can connect fills out paddy circuit, for improving the power factor (PF) of LED drive circuit, the latter selects the integrated chip switching circuit scheme that can realize high power factor to get final product the high power factor requirement of realizing circuit; Below enumerate several LED switch circuit, when high-frequency electronic ballast and civil power input are all higher than LED light source voltage, non-isolated reduction voltage circuit can be selected; When LED light source voltage is between high-frequency electronic ballast and civil power input, or when LED light source voltage inputs close to high-frequency electronic ballast and civil power, non-isolated step-up/step-down circuit can be selected; When LED light source voltage is lower than high-frequency electronic ballast and civil power input, non-isolated booster circuit can be selected; When LED light source load is low-voltage, big current, and when having isolation safe requirement, isolated circuit of reversed excitation can be selected, the above-mentioned high power factor requirement that can realize LED drive circuit, because the utility model has evaded the risk that high-frequency electronic ballast starts impacting with high pressure, therefore, LED drive part is not limited to specific switching circuit scheme, during practical application, can carry out the type of selected on-off circuit according to parameters such as the power factor requirements of circuit, LED load voltage, electric currents.
LED drive circuit of the present utility model is the first electric capacity C1 in parallel from input (i.e. the output of high-frequency electronic ballast and low frequency input), be series at two ACs of fast recovery diode or Ultrafast recovery diode D1-D4 respectively, filter capacitor C2 is accessed after full-bridge rectification, filter capacitor C2 parallel connection LED switching circuit 3, when high-frequency electronic ballast 4 exports the input as LED drive circuit 5, first electric capacity C1 and high-frequency electronic ballast 4 produce resonance, it is made to enter steady-working state fast, again through full bridge rectifier, LED switch circuit 3 is made to enter normal operating conditions fast, and then convert stable DC to LED illumination load, when accessing low frequency inductance ballast or low frequency civil power, then through the first electric capacity C1 filtering, full bridge rectifier rectification, Direct driver LED switch circuit 3 after filter capacitor C2, high-frequency electronic ballast 4 in Fig. 2 can be low frequency inductance ballast or low frequency civil power or the input of other low frequencies.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (9)
1. the LED drive circuit of a compatible high frequency electric ballast and low frequency input, it is characterized in that, comprise the first electric capacity, rectification circuit, filter circuit and LED switch circuit, described first electric capacity and high-frequency electronic ballast or low frequency input are connected in parallel, the input of described first electric capacity and rectification circuit is connected in parallel, output and the filter circuit of described rectification circuit are connected in parallel, and described filter circuit is connected with LED switch circuit in parallel.
2. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described first electric capacity is metallized film safety electric capacity.
3. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described rectification circuit is high-frequency rectification circuit.
4. the LED drive circuit of compatible high frequency electric ballast according to claim 3 and low frequency input, it is characterized in that, described high-frequency rectification circuit is high frequency bridge rectifier, and described high frequency bridge rectifier is made up of four fast recovery diodes or four Ultrafast recovery diodes.
5. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described filter circuit is filter capacitor, and the output of described filter capacitor and rectification circuit is connected in parallel, and described LED switch circuit and filter capacitor are connected in parallel.
6. the LED drive circuit of compatible high frequency electric ballast according to claim 5 and low frequency input, it is characterized in that, described filter capacitor is polypropylene capactive.
7. the LED drive circuit of compatible high frequency electric ballast according to claim 5 and low frequency input, it is characterized in that, the amount of capacity of described filter capacitor is 10nF-1uF.
8. the LED drive circuit of the compatible high frequency electric ballast according to any one of claim 5 to 7 and low frequency input, is characterized in that, the withstand voltage > 450V of described filter capacitor.
9. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described LED switch circuit is power factor correction circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372467.9U CN204741593U (en) | 2015-06-03 | 2015-06-03 | LED drive circuit of compatible sub - ballast of high frequency electric and low frequency input |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520372467.9U CN204741593U (en) | 2015-06-03 | 2015-06-03 | LED drive circuit of compatible sub - ballast of high frequency electric and low frequency input |
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| CN204741593U true CN204741593U (en) | 2015-11-04 |
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| CN105636273A (en) * | 2016-02-01 | 2016-06-01 | 深圳市豪恩光电照明股份有限公司 | LED driving circuit compatible with electronic rectifier and mains supply |
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