CN204795749U - 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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- CN204795749U CN204795749U CN201520471328.1U CN201520471328U CN204795749U CN 204795749 U CN204795749 U CN 204795749U CN 201520471328 U CN201520471328 U CN 201520471328U CN 204795749 U CN204795749 U CN 204795749U
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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 filament analog device, second filament analog device, first rectification filter circuit and second rectification filter circuit, first filament analog device and first rectification filter circuit parallel connection, second filament analog device and second rectification filter circuit parallel connection, two rectification filter circuit's positive output end is connected, and cathode output between them connects, be connected with the regulator circuit between first rectification filter circuit and the second rectification filter circuit, the regulator circuit includes the inductance and the 3rd filter circuit of series connection, and the inductance is connected with first rectification filter circuit and second rectification filter circuit's positive output end electricity, and the 3rd filter circuit is connected with first rectification filter circuit and second rectification filter circuit's cathode output electricity, and the 3rd filter circuit filter circuit 1 has the load, the utility model discloses a LED drive circuit can insert sub - ballast of high frequency electric or low frequency commercial power.
Description
Technical field
The utility model relates to field of LED illumination, particularly relates to the LED drive circuit of a kind of compatible high frequency electric ballast and low frequency input.
Background technology
Fluorescent lamp is as traditional fluorescent tube, respectively there is a filament (each filament has two stitch) 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 transitional 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.
For European market, see accompanying drawing 1, accompanying drawing 1 is European electronic ballast for fluoresent lamp operating diagram, because European high-frequency electronic ballast major part has preheating filament, and with filament measuring ability, if can't detect filament, circuit cannot start, such as when open filament or open circuit, high-frequency electronic ballast all cannot normally start and work, if be incorporated to filament resistance in filament side, then can increase due to preheating winding L A, LB, the power loss that LC brings, if LED light source is directly used in the electric ballast of existing fluorescent lamp, electric ballast can't detect filament, circuit cannot start, and European electric ballast major part is with preheating filament, the real merit increased consumption, so it is low now need to design a kind of energy consumption, can the LED drive circuit of compatible electronic ballast for fluoresent lamp, and it may be used for low frequency input, such as civil power input.
Utility model content
Technical problem to be solved in the utility model is, provides a kind of transitional product of the low-power consumption from fluorescent lamp to LED, can compatible high frequency electric ballast and low frequency input.
In order to solve the problems of the technologies described above, the utility model provides the LED drive circuit of a kind of compatible high frequency electric ballast and low frequency input, comprise the first filament analog element, second filament analog element, first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit, described first filament analog element and the first current rectifying and wave filtering circuit are connected in parallel, described second filament analog element and the second current rectifying and wave filtering circuit are connected in parallel, the cathode output end of described first current rectifying and wave filtering circuit is connected with the cathode output end of the second current rectifying and wave filtering circuit, the cathode output end of described first current rectifying and wave filtering circuit is connected with the cathode output end of the second current rectifying and wave filtering circuit, Circuit tuning is connected with between described first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit, described Circuit tuning comprises the inductance and the 3rd filter circuit that are connected in series, described inductance is electrically connected with the cathode output end of the first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit, described 3rd filter circuit is electrically connected with the cathode output end of the first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit, and described 3rd filter circuit is connected in parallel to load, the two ends of described first filament analog element are respectively first input end and the second input, and the two ends of described second filament analog element are respectively the 3rd input and four-input terminal.
As the preferred implementation of the LED drive circuit that the utility model compatible high frequency electric ballast and low frequency input, high-frequency electronic ballast is provided with four outputs, and four outputs of high-frequency electronic ballast connect the first input end of LED drive circuit, the second input, the 3rd input and four-input terminal respectively.
As the preferred implementation of the LED drive circuit that the utility model compatible high frequency electric ballast and low frequency input, low frequency is input as civil power input, described civil power input is provided with two outputs, and two outputs of civil power input connect any two in the first input end of LED drive circuit, the second input, the 3rd input and four-input terminal respectively.
As the preferred implementation of the LED drive circuit that the utility model compatible high frequency electric ballast and low frequency input, described first filament analog element and the second filament analog element are respectively the first electric capacity and the second electric capacity, or described first filament analog element and the second filament analog element are thermistor.
As the preferred implementation of the LED drive circuit that the utility model compatible high frequency electric ballast and low frequency input, described first filament analog element and the second filament analog element are respectively the first electric capacity and the second electric capacity, and described first electric capacity and the second electric capacity are metallized film safety electric capacity.
As the preferred implementation of the LED drive circuit that the utility model compatible high frequency electric ballast and low frequency input, described first current rectifying and wave filtering circuit comprises the first rectification circuit and the first filter circuit that are connected in parallel, and described second current rectifying and wave filtering circuit comprises the second rectification circuit and the second filter circuit that are connected in parallel.
As the preferred implementation of the LED drive circuit that the utility model compatible high frequency electric ballast and low frequency input, described first rectification circuit and the second rectification circuit are high-frequency rectification circuit.
As the preferred implementation of the LED drive circuit that the utility model compatible high frequency electric ballast and low frequency input, described high-frequency rectification circuit is made up of four fast recovery diodes or four Ultrafast recovery diodes.
As the preferred implementation of the LED drive circuit that the utility model compatible high frequency electric ballast and low frequency input, described first filter circuit is the first filter capacitor, and described second filter circuit is the second filter capacitor.
As the preferred implementation of the LED drive circuit that the utility model compatible high frequency electric ballast and low frequency input, described 3rd filter circuit is the low damage electrochemical capacitor of high frequency.
Implement embodiment of the present utility model, there is following beneficial effect:
LED drive circuit of the present utility model is provided with the first filament analog element and the second filament analog element, when accessing high-frequency electronic ballast, high-frequency electronic ballast can detect the first filament analog element and the second filament analog element, start resonance subsequently and start working, when accessing low frequency input, two inputs of direct connection LED drive circuit, and the loss not having filament pre-heating to cause during LED drive circuit access high-frequency electronic ballast of the present utility model, can save the energy.
Accompanying drawing explanation
Fig. 1 is electronic ballast for fluoresent lamp operating diagram;
Fig. 2 is the circuit diagram of LED drive circuit of the present utility model.
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.
Shown in accompanying drawing 2, the utility model discloses the LED drive circuit of a kind of compatible high frequency electric ballast and low frequency input, comprise the first filament analog element 3, second filament analog element 4, first current rectifying and wave filtering circuit 1 and the second current rectifying and wave filtering circuit 2, described first filament analog element 3 and the first current rectifying and wave filtering circuit 1 are connected in parallel, described second filament analog element 4 and the second current rectifying and wave filtering circuit 2 are connected in parallel, the cathode output end 11 of described first current rectifying and wave filtering circuit 1 is connected with the cathode output end 21 of the second current rectifying and wave filtering circuit 2, the cathode output end 12 of described first current rectifying and wave filtering circuit 1 is connected with the cathode output end 22 of the second current rectifying and wave filtering circuit 2, Circuit tuning 6 is connected with between described first current rectifying and wave filtering circuit 1 and the second current rectifying and wave filtering circuit 2, described Circuit tuning 6 comprises the inductance L and the 3rd filter circuit that are connected in series, described inductance L is electrically connected with the cathode output end of the first current rectifying and wave filtering circuit 1 and the second current rectifying and wave filtering circuit 2, described 3rd filter circuit is electrically connected with the cathode output end of the first current rectifying and wave filtering circuit 1 and the second current rectifying and wave filtering circuit 2, the cathode output end 11 of the first current rectifying and wave filtering circuit 1 is connected one end of inductance L with the cathode output end 21 of the second current rectifying and wave filtering circuit 2, the other end of inductance L connects the 3rd filter circuit, 3rd filter circuit connects again the cathode output end 12 of the first current rectifying and wave filtering circuit 1 and the cathode output end 22 of the second current rectifying and wave filtering circuit 2, Circuit tuning 6 and the first current rectifying and wave filtering circuit 1 and second current rectifying and wave filtering circuit 2 of inductance L and the 3rd filter circuit composition are connected in parallel, described 3rd filter circuit is connected in parallel to load 5, concrete, and described 3rd filter circuit is high frequency low damage electrochemical capacitor C3, and described load 5 can be LED light source, also can be other LED drive circuits, the two ends of described first filament analog element 3 are respectively first input end A1 and the second input A2, and the two ends of described second filament analog element 4 are respectively the 3rd input B1 and four-input terminal B2.
First filament analog element 3 described in the utility model and the second filament analog element 4 are respectively the first electric capacity C1A and the second electric capacity C1B, or, first filament analog element 3 and the second filament analog element 4 are thermistor (attached not shown), when described first filament analog element 3 and the second filament analog element 4 adopt the first electric capacity C1A and the second electric capacity C1B, described first electric capacity C1A and the second electric capacity C1B is metallized film safety electric capacity, its withstand voltage is greater than 400V, specifically can select X electric capacity.
First current rectifying and wave filtering circuit 1 described in the utility model comprises the first rectification circuit 13 and the first filter circuit 14 be connected in parallel, and described second current rectifying and wave filtering circuit 2 comprises the second rectification circuit 23 and the second filter circuit 24 be connected in parallel; Concrete, described first rectification circuit 13 and the second rectification circuit 23 are high-frequency rectification circuit, described high-frequency rectification circuit is made up of four fast recovery diodes or four Ultrafast recovery diodes (see the D1A to D4A in accompanying drawing 2 and D1B to D4B), or adopts quick or supper-fast recovery rectifier bridge stack; Described first filter circuit 14 is the first filter capacitor C2A, described second filter circuit 24 is the second filter capacitor C2B, first filter capacitor C2A, the second filter capacitor C2B and high frequency low damage electrochemical capacitor C3 play the effect of filtering, for load 5 provides the direct voltage of relative smooth.
LED drive circuit of the present utility model compatible high frequency electric ballast and low frequency can input two kinds of input forms:
The first form: access high-frequency electronic ballast, general, high-frequency electronic ballast is provided with four outputs, during embody rule, four outputs are divided into two groups of different colours, often group has two outputs, four outputs of high-frequency electronic ballast connect the first input end A1 of LED drive circuit respectively, second input A2, 3rd input B1 and four-input terminal B2, wherein the output of high-frequency electronic ballast same color connects same filament analog element (such as, two outputs of same color are connected in A1 and A2 end, two outputs of another kind of color are connected to B1 and B2 end), after LED drive circuit access high-frequency electronic ballast of the present utility model is also energized, first filament analog element 3 and the second filament analog element 4 detect as two filaments it by high-frequency electronic ballast, high-frequency electronic ballast and LED drive circuit are normally worked, when electric current flows to the second filament analog element C1B from the first filament analog element C1A, voltage signal is after the first rectification circuit 13, through the first filter capacitor C2A and the second filter capacitor C2B, flow to inductance L again, finally flow to high frequency low damage electrochemical capacitor C3, form a metastable direct current supply load, in like manner, if electric current flows to the first filament analog element C1A from the second filament analog element C1B, its course of work and on the contrary above-mentioned, during due to access high-frequency electronic ballast, incoming frequency is higher, and inductance L can play the effect of current limliting to load, effectively can weaken the impact of high-frequency electronic ballast to load.
The second form: access low frequency input, concrete, low frequency input can input for civil power, described civil power input is provided with two outputs, two outputs of civil power input connect the first input end of LED drive circuit respectively, second input, any two in 3rd input and four-input terminal, as the output access first input end A1 and the second input A2 of civil power input, after then voltage flows to the first rectification circuit 13 rectification after metallized film safety electric capacity, the direct current exported is through the first filter capacitor C2A and the second filter capacitor C2B filtering, again through inductance L, finally be input to high frequency low damage electrochemical capacitor C3 and carry out filtering, supply load operates, in like manner, if access the 3rd input B1 and four-input terminal B2 or other types of attachment, its operation principle is identical, inductance L of the present utility model is differential mode filter inductance.
LED drive circuit of the present utility model is provided with two filaments that fluorescent tube simulated by the first filament analog element 3 and the second filament analog element 4, when accessing high-frequency electronic ballast, high-frequency electronic ballast can detect the first filament analog element 3 and the second filament analog element 4, start resonance subsequently and start working, by simple discrete component circuit efficiently, achieve evading that the filament of electric ballast is detected; When accessing low frequency input, two inputs of direct connection LED drive circuit, in conjunction with the first rectification circuit 13 and the second rectification circuit 23, LED drive circuit of the present utility model can realize single-ended and double-width grinding, the such as light fixture of T tubing, and the loss not having filament pre-heating to cause during LED drive circuit access high-frequency electronic ballast of the present utility model, can save the energy.
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 (10)
1. the LED drive circuit of a compatible high frequency electric ballast and low frequency input, it is characterized in that, comprise the first filament analog element, second filament analog element, first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit, described first filament analog element and the first current rectifying and wave filtering circuit are connected in parallel, described second filament analog element and the second current rectifying and wave filtering circuit are connected in parallel, the cathode output end of described first current rectifying and wave filtering circuit is connected with the cathode output end of the second current rectifying and wave filtering circuit, the cathode output end of described first current rectifying and wave filtering circuit is connected with the cathode output end of the second current rectifying and wave filtering circuit,
Circuit tuning is connected with between described first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit, described Circuit tuning comprises the inductance and the 3rd filter circuit that are connected in series, described inductance is electrically connected with the cathode output end of the first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit, described 3rd filter circuit is electrically connected with the cathode output end of the first current rectifying and wave filtering circuit and the second current rectifying and wave filtering circuit, and described 3rd filter circuit is connected in parallel to load;
The two ends of described first filament analog element are respectively first input end and the second input, and the two ends of described second filament analog element are respectively the 3rd input and four-input terminal.
2. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, high-frequency electronic ballast is provided with four outputs, and four outputs of high-frequency electronic ballast connect the first input end of LED drive circuit, the second input, the 3rd input and four-input terminal respectively.
3. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, low frequency is input as civil power input, described civil power input is provided with two outputs, and two outputs of civil power input connect any two in the first input end of LED drive circuit, the second input, the 3rd input and four-input terminal respectively.
4. 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 filament analog element and the second filament analog element are respectively the first electric capacity and the second electric capacity, or described first filament analog element and the second filament analog element are thermistor.
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 first filament analog element and the second filament analog element are respectively the first electric capacity and the second electric capacity, and described first electric capacity and the second electric capacity are metallized film safety electric capacity.
6. 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 current rectifying and wave filtering circuit comprises the first rectification circuit and the first filter circuit that are connected in parallel, and described second current rectifying and wave filtering circuit comprises the second rectification circuit and the second filter circuit that are connected in parallel.
7. the LED drive circuit of compatible high frequency electric ballast according to claim 6 and low frequency input, it is characterized in that, described first rectification circuit and the second rectification circuit are high-frequency rectification circuit.
8. the LED drive circuit of compatible high frequency electric ballast according to claim 7 and low frequency input, it is characterized in that, described high-frequency rectification circuit is made up of four fast recovery diodes or four Ultrafast recovery diodes.
9. the LED drive circuit of compatible high frequency electric ballast according to claim 6 and low frequency input, it is characterized in that, described first filter circuit is the first filter capacitor, and described second filter circuit is the second filter capacitor.
10. the LED drive circuit of compatible high frequency electric ballast according to claim 1 and low frequency input, it is characterized in that, described 3rd filter circuit is the low damage electrochemical capacitor of high frequency.
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| CN201520471328.1U CN204795749U (en) | 2015-07-03 | 2015-07-03 | LED drive circuit of compatible sub - ballast of high frequency electric and low frequency input |
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