CN202696471U - Tandem topological LED (light emitting diode) switching power circuit - Google Patents
Tandem topological LED (light emitting diode) switching power circuit Download PDFInfo
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- CN202696471U CN202696471U CN 201220341210 CN201220341210U CN202696471U CN 202696471 U CN202696471 U CN 202696471U CN 201220341210 CN201220341210 CN 201220341210 CN 201220341210 U CN201220341210 U CN 201220341210U CN 202696471 U CN202696471 U CN 202696471U
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Abstract
The utility model discloses a tandem topological LED (light emitting diode) switching power circuit. The tandem topological LED switching power circuit comprises a power input end, an input filter, a tandem topological electric energy transducer, an isolation power output, and a power output end, which are serially connected in sequence. The tandem topological LED switching power circuit provided by the utility model overcomes the disadvantages of the prior art, such as low electric energy conversion efficiency, short LED service life, non-constant peak values set for output current and voltage, complicated circuit structure, large size, and high product cost, and has the advantages of simple structure, high electric energy conversion efficiency, constant current and voltage peak values, high power density, small size and so on.
Description
Technical field
The utility model relates to LED switch power supply road technique, is a kind of series topology LED switching power circuit specifically.
Background technology
The LED illuminating lamp needs a kind of Switching Power Supply of satisfied a series of requirements of modern times, and constant, the high power density of peak point that high energy conversion efficiency, output current voltage are set is conveniently designed the topological circuit of less small product size, cheap product cost.
LED can adopt the power supply of non-insulating power supply fully, but for the relation of safety and heat radiation, most of product application scenario must adopt insulating power supply to power.
LED illuminating lamp product is to the requirement of power supply, and in the trouble free service peak value of setting, current/voltage will prolong the working life of LED in the soft fluctuation of certain regular scope.
Available circuit can't be finished in a product and satisfy above requirement, particularly product photoelectric transformation efficiency and product cost and functional reliability etc.
The utility model content
The purpose of this utility model is to overcome the deficiency that above prior art exists, and a kind of simple in structure, energy conversion efficiency is high, the current/voltage peak value is constant and the high power density small product size is little series topology LED switching power circuit is provided.
In order to achieve the above object, the utility model by the following technical solutions: a kind of series topology LED switching power circuit comprises that power input, input filter, the conversion of series topology electric energy, the isolation electric energy of successively series loop exported, power output end.
As a kind of preferred structure, L, N is power input, input filter (1) is by keeping RV1, capacitor C 1, common mode inductance L1, capacitor C 2 forms, series topology electric energy conversion (2) is by directed rectification DB1, capacitor C 3, energy storage inductor L3, transformer T1, inductance L 2, diode D1, switching tube Q1, resistance R 1 forms, wherein the directional current output plus terminal of DB1 rectification circuit is connected to the end of energy storage inductor L3 and the negative pole end of diode D1, the other end of energy storage inductor L3 is connected to the elementary end of transformer T1, the elementary other end of transformer T1 is connected to the drain D end of switching tube Q1 and an end of inductance L 2, the other end of inductance L 2 is connected to the positive terminal of diode D1, the source S end of switching tube Q1 is connected to an end of resistance R 1, the other end of resistance R 1 is connected to the directional current output negative terminal of DB1, and isolation electric energy output (3) is by diode D3, D2, inductance L 4, capacitor C 4 forms; One end of T1 level of transformer is connected to the positive terminal of diode D3, the negative pole end of diode D3 is connected to an end of diode D2 negative pole end and inductance L 4, the other end of inductance L 4 is connected to an end power supply of capacitor C 4 and is just exporting, and the positive terminal of diode D2 is connected to the other end of T1 level of transformer and the other end power supply output of capacitor C 4 is born.After adopting said structure, because energy storage inductor L3 connects with transformer T1 is elementary, can improve the energy conversion efficiency height, the current/voltage peak value is constant, because be applicable to high power products, if adopt other structure, the volume of product can be very large, and the structure in the utility model has the little characteristics of high power density small product size.
When the use state is higher power, also comprise inductance L 2, the elementary other end of transformer T1 is connected to an end of inductance L 2, and the other end of inductance L 2 is connected to the positive terminal of diode D1.
As the preferred structure of another kind, described L, N is power input, input filter (1) is by keeping RV1, capacitor C 1, common mode inductance L1, capacitor C 2 forms, series topology electric energy conversion (2) is by directed rectification DB1, capacitor C 3, energy storage inductor L3, transformer T1, inductance L 2, diode D1, switching tube Q1, resistance R 1 forms, wherein the directional current output plus terminal of DB1 is connected to the drain D end of switching tube Q1, Q1 source S end is connected to the negative pole end of diode D1 and an end of inductance L 3, the other end of inductance L 3 is connected to the elementary end of transformer T1, the elementary other end of transformer T1 is connected to an end of resistance R 1 and an end of inductance L 2, the other end of inductance L 2 is connected to the positive terminal of diode D1, the other end of resistance R 1 connects the directed output of DB1 rectification circuit negative terminal, and isolation electric energy output (3) is by diode D3, D2, inductance L 4, capacitor C 4 forms; One end of T1 level of transformer is connected to the positive terminal of diode D3, the negative pole end of diode D3 is connected to an end of diode D2 negative pole end and inductance L 4, the other end of inductance L 4 is connected to an end power supply of capacitor C 4 and is just exporting, and the positive terminal of diode D2 is connected to the other end of T1 level of transformer and the other end power supply output of capacitor C 4 is born.
For protective circuit, also comprise the overvoltage protection pipe RV2 in parallel with capacitor C 4.
As a kind of preferred structure, described energy storage inductor L3 quantity is 1.
As a kind of preferred structure, described switching tube Q1 is IGBT pipe or MOSFET field effect transistor, or is the switching tube of other identical function.
The utility model is applicable to LED electrical equipment, is particularly useful for the LED lamp.
Realization principle of the present utility model: a kind of series topology LED switching power circuit comprises that power input, input filter, the conversion of series topology electric energy, the isolation electric energy of successively series loop exported, power output end.
Power supply input L, N, RV1 is connected in parallel on power input L, overvoltage protection pipe on the N, capacitor C 1, common mode inductance L1, capacitor C 2 forms input EMI filter circuit, the DB1 rectification circuit provides directed interchange out-put supply, capacitor C 3 is connected in parallel on and does the alternating current zero crossing compensation on the directed output loop end of DB1 rectification circuit, 1 above energy storage inductor L3 of series connection in the directional current output loop of DB1 rectification circuit, the directional current output plus terminal of DB1 rectification circuit directly is connected with the negative pole end of diode D1 provides the continuous current circuit that resets, switching tube Q1 in the electric energy conversion loop is lower type of drive or upper type of drive, the end of the other end contact resistance R1 that transformer T1 is elementary and the positive terminal of diode D1, the other end of resistance R 1 are connected to the directional current output negative terminal of DB1 rectification circuit; One end of T1 level of transformer is connected to the positive terminal of diode D3, the negative pole end of diode D3 is connected to an end of diode D2 negative pole end and inductance L 4, the other end of inductance L 4 is connected to an end power supply of capacitor C 4 and is just exporting, and the positive terminal of diode D2 is connected to the other end of T1 level of transformer and the other end power supply output of capacitor C 4 is born.
When adopting lower type of drive, the directional current output plus terminal of DB1 rectification circuit is connected to the end of energy storage inductor L3 and the negative pole end of diode D1, the other end of energy storage inductor L3 is connected to the elementary end of transformer T1, the elementary other end of transformer T1 is connected to the drain D end of switching tube Q1 and an end of inductance L 2, the other end of inductance L 2 is connected to the positive terminal of diode D1, the source S end of switching tube Q1 is connected to an end of resistance R 1, and the other end of resistance R 1 is connected to the directional current output negative terminal of DB1.
When adopting upper type of drive, the directional current output plus terminal of DB1 rectification circuit is connected to the drain D end of switching tube Q1, switching tube Q1 source S end is connected to the negative pole end of diode D1 and the end of energy storage inductor L3, the other end of energy storage inductor L3 is connected to the elementary end of transformer T1, the elementary other end of transformer T1 is connected to an end of resistance R 1 and an end of inductance L 2, the other end of inductance L 2 is connected to the positive terminal of diode D1, and the other end of resistance R 1 connects the directed output of DB1 rectification circuit negative terminal.
Energy storage inductor L3, transformer T1 in the utility model is elementary, switching tube Q1, resistance R 1 forms the electric energy conversion and drive the loop, is connected on the positive and negative end of the directed rectification DB1 circuit of AC.
The utility model drives the energy storage inductor L3 that seals in the loop more than 1 in the electric energy conversion, can make high frequency transformation transformer T1, comprises power factor emendation function thereby high energy conversion efficiency is targeted fit, thus Design of Transformer T1 parameter.1 closure reset that the loop is elementary by L3, transformer T1, inductance L 2, diode D1 form; The elementary of transformer T1 seals in wherein, reseting procedure obtains energy output equally, L2 suppresses reverse recovery loss, (inductance L 2 is selectable, can be without this inductance when small-power power is used) the inductance L 3 Simultaneous Stabilization input voltage and input current transient waves that seal in, make output more stable, have simultaneously good harmonic and suppress, whole driving loop is with efficiency operation.
The output of power supply has sealed in 4, one suitable inductance L 4 of inductance L can make output current level and smooth, and the rectification in the output circuit (D2, D3) can be adopted circuit of synchronous rectification according to practical situations, to improve delivery efficiency.
The utility model circuit and existing product difference are, electric energy conversion and power factor correction are in a body running, the loss of independent circuit of power factor correction and the complexity of circuit have been got by province, reduced cost, available circuit is independently circuit of power factor correction or reverse excitation circuit basically; The conversion of electric energy in the utility model drives the loop and connects with the elementary whole loops of transformer T1, so the generation of all loop currents outputs to transformer T1 secondary load simultaneously in the electric energy transfer process, this be available circuit can not; During the power supply electrifying process, because the effect of energy storage inductor L3 is arranged, the energy that power supply electrifying consumes is few, and this is connected to power supply in enormous quantities and answers the direct advantage of apparatus on the same electric power loop; Energy storage inductor L3 has the multilayer function in circuit: electric energy conversion impedance loop is adaptive, harmonic suppresses, bear the main stress of whole electric energy conversion, to realize higher electric energy conversion work frequency, to make other semiconductor device work more reliable and more stable etc.
Use with control circuit in the utility model practical application, control circuit can adopt power factor correction pfc circuit commonly used, IC control, simultaneously power factor correction, output voltage stabilizing feedback is by a light-coupled isolation picked up signal, with control output voltage voltage stabilizing value, more high-precision output or the different way of outputs design corresponding feedback circuit and realize.
The utility model has following advantage and effect with respect to prior art:
1, the utility model adopted comprise that energy storage inductor L3, transformer T1 are elementary, diode D1, inductance L 4, and energy storage inductor L3 connects with transformer T1 is elementary, has simple in structure, higher than the operating frequency of available circuit, the characteristics such as energy conversion efficiency is high, the current/voltage peak value is constant and the high power density small product size is little.
2, after the utility model and control circuit such as power factor correction pfc circuit are used, because there is signal output to cooperate, so have power factor emendation function, without humorous wave interference, be easy to the characteristics such as EMI inhibition.
3, the utility model has designed inductance L 4, can design and give birth to highly stable output voltage, also can be designed to the constant current voltage limiting mode and export, and also can be designed to permanent power mode output.
4, the utility model is provided with inductance L 2, and when the high-power time spent, inductance L 2 is absolutely necessary, and protection diode D1 further improves the energy conversion efficiency height.
5, the utility model circuit overall losses is little, and the impact stress of all online semiconductor device works of circuit is little, and working stability is reliable.
Description of drawings
Fig. 1 is a kind of series topology LED of the utility model switching power circuit theory diagram;
Fig. 2 is the circuit theory diagrams of a kind of series topology LED of the utility model switching power circuit embodiment 1;
Fig. 3 is a kind of series topology LED of the utility model switching power circuit circuit theory diagrams when being combined with control circuit;
Fig. 4 is the circuit theory diagrams of a kind of series topology LED of the utility model switching power circuit embodiment 2.
Embodiment
For ease of it will be appreciated by those skilled in the art that the utility model is described in further detail below in conjunction with drawings and Examples.
Embodiment 1:
Shown in Fig. 1 ~ 3, a kind of series topology LED switching power circuit comprises that power input, input filter 1, the series topology electric energy of successively series loop changes 2, isolates electric energy output 3, power output end.Wherein, L, N is the power supply input, RV1 is connected in parallel on power input L, overvoltage protection pipe on the N, input filter 1 is by keeping RV1, capacitor C 1, common mode inductance L1, capacitor C 2 forms, the conversion 2 of series topology electric energy is by directed rectification DB1, capacitor C 3, energy storage inductor L3, transformer T1, inductance L 2, diode D1, switching tube Q1, resistance R 1 forms, the DB1 rectification circuit is to provide directed interchange out-put supply, capacitor C 3 is connected in parallel on the directed output loop end of DB1 and does the alternating current zero crossing compensation, the directional current of DB1 is just being exported+is being held and is being connected to the end of energy storage inductor L3 and the negative pole end of diode D1, the other end of energy storage inductor L3 is connected to the elementary end of transformer T1, the elementary other end of transformer T1 is connected to the drain D end of switching tube Q1 and an end of inductance L 2, the other end of inductance L 2 is connected to the positive terminal of diode D1, the source S end of switching tube Q1 is connected to an end of resistance R 1, and the other end of resistance R 1 is connected to the directional current output of DB1 rectification circuit and bears-end; One end of T1 level of transformer is connected to the positive terminal of diode D3, the negative pole end of diode D3 is connected to an end of diode D2 negative pole end and inductance L 4, the other end of inductance L 4 is connected to an end power supply of capacitor C 4 and is just exporting, and the positive terminal of diode D2 is connected to the other end of T1 level of transformer and the other end power supply output of capacitor C 4 is born.
Wherein, inductance L 2 is optional inductance, when small-power power is used, can be without inductance L 2, and the positive pole of diode D1 is directly connected to the elementary other end of depressor T1.Energy storage inductor L3 quantity in the present embodiment is 1, and resistance R 1 is current sense resistor, and transformer T1 is high frequency transformer.
In order to protect output circuit, also comprise the overvoltage protection pipe RV2 in parallel with capacitor C 4, switching tube Q1 is IGBT pipe or MOSFET field effect transistor, or is the switching tube of other identical function.
As shown in Figure 3, the present embodiment control circuit adopts the IC chip, IC is a kind of power factor correction PFC chip commonly used, the operation principle of this class chip is similar, the power supply of control section has increased a winding from transformer T1 provide power supply for control, the startup power supply is just being exported+held by the electric current that resistance R 4 is connected to DB1 provides the startup power supply, resistance R 2, R3 is the sinusoidal wave sampling of AC divider resistance, 6 cycle of resistance R zero current restarts the signal current-limiting resistance, resistance R 5 is connected to the grid G end of switching tube Q1 with the work of control switch pipe Q1, resistance R 8, capacitor C 8, C9 forms output voltage signal error amplifier interface, signal is by optocoupler I1, voltage-stabiliser tube Z2,10 groups of signal feedback circuits the most basic of resistance R.
The output of power supply has sealed in 4, one suitable inductance L 4 of inductance L can make output current level and smooth, and the rectification in the output circuit (D2, D3) can be adopted circuit of synchronous rectification according to practical situations, to improve delivery efficiency.
As shown in Figure 4, the present embodiment difference from Example 1 is: upper type of drive is adopted in this enforcement, a kind of series topology LED switching power circuit, circuit comprises L, N is the power supply input, RV1 is connected in parallel on power input L, overvoltage protection pipe on the N, capacitor C 1, common mode inductance L1, capacitor C 2 forms input EMI filter circuit, the DB1 rectification circuit is to provide directed interchange out-put supply, capacitor C 3 is connected in parallel on the directed output loop end of DB1 rectification circuit and does the alternating current zero crossing compensation, the directional current output plus terminal of DB1 is connected to the drain D end of switching tube Q1, Q1 source S end is connected to the negative pole end of diode D1 and an end of inductance L 3, the other end of inductance L 3 is connected to the elementary end of transformer T1, the elementary other end of transformer T1 is connected to an end of resistance R 1 and an end of inductance L 2, the other end of inductance L 2 is connected to the positive terminal of diode D1, and the other end of resistance R 1 connects the directed output of DB1 rectification circuit negative terminal; One end of T1 level of transformer is connected to the positive terminal of diode D3, the negative pole end of diode D3 is connected to an end of diode D2 negative pole end and inductance L 4, the other end of inductance L 4 is connected to an end power supply of capacitor C 4 and is just exporting, and the positive terminal of diode D2 is connected to the other end of T1 level of transformer and the other end power supply output of capacitor C 4 is born.Identical on present embodiment and embodiment 1 principle.
Above-mentioned embodiment is preferred embodiment of the present utility model; can not limit the utility model; other any change that does not deviate from the technical solution of the utility model and make or other equivalent substitute mode are included within the protection range of the present utility model.
Claims (5)
1. a series topology LED switching power circuit is characterized in that: the power input, input filter (1), series topology electric energy conversion (2), the output of isolation electric energy (3), the power output end that comprise successively series loop.
2. series topology LED switching power circuit according to claim 1, it is characterized in that: L, N is power input, input filter (1) is by keeping RV1, capacitor C 1, common mode inductance L1, capacitor C 2 forms, series topology electric energy conversion (2) is by directed rectification DB1, capacitor C 3, energy storage inductor L3, transformer T1, inductance L 2, diode D1, switching tube Q1, resistance R 1 forms, wherein the directional current output plus terminal of DB1 rectification circuit is connected to the end of energy storage inductor L3 and the negative pole end of diode D1, the other end of energy storage inductor L3 is connected to the elementary end of transformer T1, the elementary other end of transformer T1 is connected to the drain D end of switching tube Q1 and an end of inductance L 2, the other end of inductance L 2 is connected to the positive terminal of diode D1, the source S end of switching tube Q1 is connected to an end of resistance R 1, the other end of resistance R 1 is connected to the directional current output negative terminal of DB1, and isolation electric energy output (3) is by diode D3, D2, inductance L 4, capacitor C 4 forms.
3. series topology LED switching power circuit according to claim 1, it is characterized in that: L, N is power input, input filter (1) is by keeping RV1, capacitor C 1, common mode inductance L1, capacitor C 2 forms, series topology electric energy conversion (2) is by directed rectification DB1, capacitor C 3, energy storage inductor L3, transformer T1, inductance L 2, diode D1, switching tube Q1, resistance R 1 forms, wherein the directional current output plus terminal of DB1 is connected to the drain D end of switching tube Q1, Q1 source S end is connected to the negative pole end of diode D1 and an end of inductance L 3, the other end of inductance L 3 is connected to the elementary end of transformer T1, the elementary other end of transformer T1 is connected to an end of resistance R 1 and an end of inductance L 2, the other end of inductance L 2 is connected to the positive terminal of diode D1, the other end of resistance R 1 connects the directed output of DB1 rectification circuit negative terminal, and isolation electric energy output (3) is by diode D3, D2, inductance L 4, capacitor C 4 forms.
4. it is characterized in that according to claim 2 or 3 described series topology LED switching power circuits: also comprise the overvoltage protection pipe RV2 in parallel with capacitor C 4.
5. according to claim 2 or 3 described series topology LED switching power circuits, it is characterized in that: described switching tube Q1 is IGBT pipe or MOSFET field effect transistor, or is the switching tube of other identical function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220341210 CN202696471U (en) | 2012-07-13 | 2012-07-13 | Tandem topological LED (light emitting diode) switching power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220341210 CN202696471U (en) | 2012-07-13 | 2012-07-13 | Tandem topological LED (light emitting diode) switching power circuit |
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| CN202696471U true CN202696471U (en) | 2013-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220341210 Expired - Fee Related CN202696471U (en) | 2012-07-13 | 2012-07-13 | Tandem topological LED (light emitting diode) switching power circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810986A (en) * | 2012-07-13 | 2012-12-05 | 韩腊生 | Series topological light-emitting diode (LED) switching power circuit |
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2012
- 2012-07-13 CN CN 201220341210 patent/CN202696471U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102810986A (en) * | 2012-07-13 | 2012-12-05 | 韩腊生 | Series topological light-emitting diode (LED) switching power circuit |
| CN102810986B (en) * | 2012-07-13 | 2016-04-20 | 韩腊生 | A kind of series topology LED switch power circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130123 Termination date: 20160713 |