CN203279300U - Capacitor-free full-bridge inversion full-wave rectification LED driving circuit - Google Patents
Capacitor-free full-bridge inversion full-wave rectification LED driving circuit Download PDFInfo
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- CN203279300U CN203279300U CN 201320301580 CN201320301580U CN203279300U CN 203279300 U CN203279300 U CN 203279300U CN 201320301580 CN201320301580 CN 201320301580 CN 201320301580 U CN201320301580 U CN 201320301580U CN 203279300 U CN203279300 U CN 203279300U
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Abstract
The utility model discloses a capacitor-free full-bridge inversion full-wave rectification LED driving circuit comprising a DC power supply V1. A full-bridge inverter circuit is formed by a first switching element K1, a second switching element K2, a third switching element K3, and a fourth switching element K4. One end of the full-bridge inverter circuit is connected with the positive pole of the DC power supply V1, while the other end of the full-bridge inverter circuit is connected with the negative pole of the DC power supply V1. Two leading wires on the primary side of a transformer T are connected with the middle points of two bridge arms of the full-bridge inverter circuit, respectively. A central tap on the secondary side of the transformer T is connected with the cathode of a light emitting diode. The other two leading wires on the secondary side of the transformer T are connected with one end of a fifth switching element K5 and one end of a sixth switching element K6, respectively. The other end of the fifth switching element K5 and the other end of the sixth switching element K6 are connected together and connected with a freewheeling inductor L and then are connected with the anode of another light emitting diode in series. The capacitor-free full-bridge inversion full-wave rectification LED driving circuit prevents electrolytic capacitors from being used and prolongs the service life of the driving circuit.
Description
Technical field
The utility model relates to a kind of LED drive circuit, is specifically related to a kind of non-capacitive LED drive circuit.
Background technology
Driving LED needs special drive circuit, and traditional LED drive circuit is owing to having used shorter electrochemical capacitor of life-span, so the life-span of the life-span of drive circuit and LED differs greatly, this has affected the application of LED greatly.So the LED drive circuit of design no electrolytic capacitor is for the useful life that extends LED driver, the use scale that increases LED is extremely important.
The utility model content
The technical problems to be solved in the utility model is that LED drive circuit is short useful life, the non-capacitive full-bridge inverting full-wave rectification LED drive circuit of a kind of simple in structure, the long service life that provides.
the technical solution of the utility model realizes in the following manner: a kind of non-capacitive full-bridge inverting full-wave rectification LED drive circuit, comprise DC power supply V1, the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4, transformer T, the 5th switch element K5, the 6th Katyuan part K6, light-emitting diode, the afterflow inductance L, the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4 forms full bridge inverter, the positive pole of full bridge inverter one termination DC power supply V1, the negative pole of one termination DC power supply V1, two lead-in wires on the former limit of transformer T connect respectively the mid point of full bridge inverter two brachium pontis, the negative electrode of the centre cap sending and receiving optical diode of transformer T secondary, other two lead-in wires of secondary connect respectively the end of the 5th switch element K5 and the 6th switch element K6, the other end of the 5th switch element K5 and the 6th switch element K6 stream inductance L that is connected together and continues, be serially connected in again the light-emitting diodes tube anode.
Described the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4 are field effect transistor or transistor.
Described the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4 are the insulation bipolar transistor.
The 5th switch element K5, the 6th switch element K6 are rectifier diode.
Described light-emitting diode comprises the first LED 1, the second LED 2 and the 3rd LED 3.
The full bridge inverter that the some switch elements of the utility model form, the full-wave rectifying circuit that full bridge inverter, coupling transformer, rectifier diode, Light-Emitting Diode form can avoid using electrochemical capacitor, can make the drive circuit life.
Description of drawings
Fig. 1 is circuit model figure of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Fig. 3 is working waveform figure of the present utility model.
Embodiment
as shown in Figure 1, drive circuit of the present utility model comprises DC power supply V1, the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4, transformer T, the 5th switch element K5, the 6th Katyuan part K6, light-emitting diode, afterflow inductance L, the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4 forms full bridge inverter, the positive pole of full bridge inverter one termination DC power supply V1, the negative pole of one termination DC power supply V1, two lead-in wires on the former limit of transformer T connect respectively the mid point of full bridge inverter two brachium pontis, the negative electrode of the centre cap sending and receiving optical diode of transformer T secondary, other two lead-in wires of secondary connect respectively the end of the 5th switch element K5 and the 6th switch element K6, the other end of the 5th switch element K5 and the 6th switch element K6 stream inductance L that is connected together and continues, be serially connected in again the light-emitting diodes tube anode.
as shown in Figure 2, described the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4 is corresponding the first triode VT1 respectively, the second triode VT2, the 3rd triode VT3 and the 4th triode VT4, corresponding the first rectifier diode D1 of the 5th switch element K5 and the 6th switch element K6 and the second rectifier diode D6, the first triode VT1, the second triode VT2, the 3rd triode VT3 and the 4th triode VT4 form full bridge inverter, the first triode VT1, the drain electrode of the second triode VT2 (or collector electrode, anode) be connected and access the positive pole of DC power supply V1, the 3rd triode VT3, the source electrode of the 4th triode VT4 (or emitter, negative electrode) be connected and access the negative pole of DC power supply V1, the source electrode of the first triode VT1 (or emitter, negative electrode) with drain electrode (or the collector electrode of the 3rd triode VT3, anode) be connected to form a brachium pontis of inverter, the drain electrode of the source electrode of the second triode VT2 (or emitter, negative electrode) and the 4th triode VT4 (or collector electrode, anode) is connected to form another brachium pontis of inverter, and transformer T former limit lead-in wire connects respectively the mid point of two brachium pontis of full-bridge inverter.
The negative electrode of the centre cap sending and receiving optical diode of transformer T secondary, other two lead-in wires of secondary connect respectively the anode of the first rectifier diode D1 and the second rectifier diode D2, the negative electrode of the first rectifier diode D1 and the second rectifier diode D2 stream inductance L that continues that is connected together, then be serially connected in the anode of light-emitting diode.Described light-emitting diode comprises the first LED 1, the second LED 2 and the 3rd LED 3.
As shown in Figure 3, suppose that all elements all work in the ideal situation.The first triode VT1, the second triode VT2, the 3rd triode VT3 and the 4th triode VT4 are operated under the periodic switch state, by the grid of the first triode VT1, the second triode VT2, the 3rd triode VT3 and the 4th triode VT4 (or base stage, gate pole) input pwm signal, the turning on and off of control switch element.
In a switch periods, 4 operation modes are arranged, in 4 mode in the grid of the first triode VT1, the second triode VT2, the 3rd triode VT3 and the 4th triode VT4 input pwm signal voltage such as Fig. 3
U g14With
U g23Shown in.
Mode 1(
t 0～
t 1)
as the first triode VT1, the 4th triode VT4 conducting, the second triode VT2, during the 3rd triode VT3 cut-off, the first triode VT1, the 4th triode VT4 terminal voltage is zero, the second triode VT2, the 3rd triode VT3 terminal voltage is V1, the former edge point C of transformer T, there is electric current to flow through between D, the flow direction of primary current is a DC power supply V1 positive pole-A-first an a triode VT1-C-D-the 4th a triode VT4-B-DC power supply V1 negative pole, under negative on transformer T original edge voltage just, by Same Name of Ends as can be known transformer T secondary voltage be also upper negative under just, by transformer Same Name of Ends relation as can be known, secondary E point electromotive force is higher than D point electromotive force, and F point electromotive force is higher than E point electromotive force.At this moment, the second rectifier diode D2 satisfies turn-on condition meeting conducting, current waveform such as point
I DShown in, thereby the first rectifier diode D1 does not satisfy the turn-on condition cut-off.So the secondary current direction is F-second a rectifier diode D2-afterflow inductance L-light-emitting diode-E.
Mode 2(
t 1～
t 2)
The first triode VT1, the second triode VT2, the 3rd triode VT3 and the 4th triode VT4 end, DC power supply V1 is not to transformer secondary transferring energy, energy storage effect due to the afterflow inductance L, the first rectifier diode D1, the second rectifier diode D2 and light-emitting diode all are in conducting state, flow through the electric current uniform distribution of afterflow inductance L to the first rectifier diode D1, the second rectifier diode D2 and light-emitting diode.
Mode 3(
t 2～
t 3)
as the second triode VT2, the 3rd triode VT3 conducting, the first triode VT1, during the 4th triode VT4 cut-off, the second triode VT2, the 3rd triode VT3 terminal voltage is zero, the first triode VT1, the 4th triode terminal voltage is V1, the former edge point D of transformer T, there is electric current to flow through between C, the flow direction of coupling transformer primary current is a DC power supply V1 positive pole-A-second an a triode VT2-D-C-the 3rd a triode VT3-B-DC power supply V1 negative pole, just lower negative on transformer T original edge voltage, by transformer Same Name of Ends relation as can be known secondary D point electromotive force higher than E point electromotive force, E point electromotive force is higher than F point electromotive force.At this moment, the first rectifier diode D1 satisfies turn-on condition meeting conducting, current waveform such as point
I DShown in, thereby the second rectifier diode D2 does not satisfy the turn-on condition cut-off.So the secondary current direction is D-second a rectifier diode D1-afterflow inductance L-light-emitting diode-E.
Mode 4(
t 3～
t 4)
The first triode VT1, the second triode VT2, the 3rd triode VT3 and the 4th triode VT4 end, DC power supply V1 is not to transformer secondary transferring energy, due to the energy storage effect of afterflow inductance L, the first rectifier diode D1, the second rectifier diode D2 and light-emitting diode all are in conducting state.Flow through the electric current uniform distribution of afterflow inductance L to the first rectifier diode D1, the second rectifier diode D2.
In summary, in turn when conducting and cut-off, carry electric current through transformer and secondary full-wave rectifying circuit to light-emitting diode as the first triode VT1, the 4th triode VT4 and the second triode VT2, the 3rd triode VT3.
Claims (5)
1. a non-capacitive full-bridge inverting full-wave rectification LED drive circuit, comprise DC power supply V1, the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4, transformer T, the 5th switch element K5, the 6th Katyuan part K6, light-emitting diode, afterflow inductance L, it is characterized in that: the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4 forms full bridge inverter, the positive pole of full bridge inverter one termination DC power supply V1, the negative pole of one termination DC power supply V1, two lead-in wires on the former limit of transformer T connect respectively the mid point of full bridge inverter two brachium pontis, the negative electrode of the centre cap sending and receiving optical diode of transformer T secondary, other two lead-in wires of secondary connect respectively the end of the 5th switch element K5 and the 6th switch element K6, the other end of the 5th switch element K5 and the 6th switch element K6 stream inductance L that is connected together and continues, be serially connected in again the light-emitting diodes tube anode.
2. non-capacitive full-bridge inverting full-wave rectification LED drive circuit according to claim 1, it is characterized in that: described the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4 are field effect transistor or transistor.
3. non-capacitive full-bridge inverting full-wave rectification LED drive circuit according to claim 2, it is characterized in that: described the first switch element K1, second switch element K2, the 3rd switch element K3, the 4th switch element K4 are the insulation bipolar transistor.
4. non-capacitive full-bridge inverting full-wave rectification LED drive circuit as claimed in claim 1, it is characterized in that: the 5th switch element K5, the 6th switch element K6 are rectifier diode.
5. non-capacitive full-bridge inverting full-wave rectification LED drive circuit as claimed in claim 1, it is characterized in that: described light-emitting diode comprises the first LED 1, the second LED 2 and the 3rd LED 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320301580 CN203279300U (en) | 2013-05-29 | 2013-05-29 | Capacitor-free full-bridge inversion full-wave rectification LED driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320301580 CN203279300U (en) | 2013-05-29 | 2013-05-29 | Capacitor-free full-bridge inversion full-wave rectification LED driving circuit |
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| CN203279300U true CN203279300U (en) | 2013-11-06 |
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|---|---|---|---|
| CN 201320301580 Expired - Fee Related CN203279300U (en) | 2013-05-29 | 2013-05-29 | Capacitor-free full-bridge inversion full-wave rectification LED driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811233A (en) * | 2016-04-20 | 2016-07-27 | 华北电力大学（保定） | Full-bridge inverter circuit laser driving circuit |
-
2013
- 2013-05-29 CN CN 201320301580 patent/CN203279300U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811233A (en) * | 2016-04-20 | 2016-07-27 | 华北电力大学（保定） | Full-bridge inverter circuit laser driving circuit |
| CN105811233B (en) * | 2016-04-20 | 2019-02-26 | 华北电力大学（保定） | A kind of full bridge inverter laser driving 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 |
Granted publication date: 20131106 Termination date: 20150529 |
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| EXPY | Termination of patent right or utility model |