CN203301826U - LED driving circuit composed of discrete components - Google Patents
LED driving circuit composed of discrete components Download PDFInfo
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- CN203301826U CN203301826U CN2013203533884U CN201320353388U CN203301826U CN 203301826 U CN203301826 U CN 203301826U CN 2013203533884 U CN2013203533884 U CN 2013203533884U CN 201320353388 U CN201320353388 U CN 201320353388U CN 203301826 U CN203301826 U CN 203301826U
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Abstract
The utility model relates to an LED driving circuit composed of discrete components. The LED driving circuit includes two input signal lines connected with an external AC power supply; a rectifying and filtering circuit, a half-bridge-circuit integration triggering circuit, a half-bridge inverting circuit, an LC series resonant circuit, an output rectification circuit and a series-connection LED chip group. The LED driving circuit of the utility model is advantageous in reasonable, simple and reliable structure, and stable performance. According to the LED driving circuit of the utility model, the number of the components of a circuit is small, so the LED driving circuit can be embedded into a narrow space of an LED lighting lamp with easiness; a special constant-current control chip is not needed, and parts available in markets can be utilized to assemble the LED driving circuit, and an expensive integrated IC is not needed, and therefore, cost can be greatly reduced, and the cost performance of the LED driving circuit is excellent; and constant-current control can be realized at the same time, and problems existing in a constant-current source drive chip can be solved, and therefore, the LED driving circuit has strong adaptability and can be widely used in all kinds of LED lighting lamps.
Description
Technical field:
The utility model relates to the field of lighting, relates in particular to a kind of LED drive circuit that is comprised of discrete component.
Background technology:
Along with improving constantly of light efficiency, LED has obtained huge development as the general lighting light source in recent years, with respect to incandescent lamp, the drive circuit complexity of LED many, the driving power ubiquity LED of LED drives the problems such as high, the whole circuit accessory of chip price cost high technology complexity, cause the production cost of LED light fixture high, be unfavorable for applying.
The utility model content:
The technical problems to be solved in the utility model is the above-mentioned deficiency for prior art, and a kind of simple in structure, LED drive circuit that is comprised of discrete component that can reduce production costs is provided.
In order to solve the problems of the technologies described above, the utility model adopts following technical scheme:
By the LED drive circuit that discrete component forms, include integration circuits for triggering, half-bridge inversion circuit, LC series resonant circuit, output rectification circuit and the series LED chipset of two input signal cables being connected with external ac power source, current rectifying and wave filtering circuit, half-bridge circuit; Wherein, after on first input signal cable that is connected with external ac power source, resistance R 8 is insured in series connection, together with second input signal cable, access the input of current rectifying and wave filtering circuit, the output of current rectifying and wave filtering circuit is connected to two branch roads parallel with one another, the first parallel branch connects the integration circuits for triggering of half-bridge circuit, on the second parallel branch, connects half-bridge inversion circuit;
Described current rectifying and wave filtering circuit is comprised of diode D1, D2, D3, D4 and capacitor C 2, C3, diode D1, D2, D3, D4 are that bridge-type connects, form rectification circuit, capacitor C 2, C3 are in series, form filter circuit, between rectification circuit and filter circuit for being connected in parallel, between capacitor C 2 and C3, also be provided with the first terminals;
The integration circuits for triggering of described half-bridge circuit are comprised of the resistance R 1 that is connected in series, R2, capacitor C 5 and bidirectional trigger diode DB3, between resistance R 1 and R2, be provided with the second terminals, between resistance R 2 and capacitor C 5, be provided with the 3rd terminals, between the second terminals and the 3rd terminals, be connected with diode D5, and the anode of diode D5 is connected with the 3rd terminals;
Described half-bridge inversion circuit is by triode Q1, Q2, magnetic ring transformer T1 and resistance R 3, R4, R5, R6 form, after the emitter series resistance R3 of triode Q1, with the collector electrode of triode Q2, be connected, from the second terminals, draw wire, between the emitter of access triode Q1 and the collector electrode of triode Q2, after the emitter series resistance R4 of triode Q2, together with the collector electrode of triode Q1, access the output of current rectifying and wave filtering circuit, from the 3rd terminals, draw wire, after series connection bidirectional trigger diode DB3, receive the base stage of triode Q2; The base stage of the base stage of triode Q1 and emitter and triode Q2 and emitter are received respectively the two ends of two elementary taps of magnetic ring transformer T1, between two elementary taps of the base stage of triode Q1 and Q2 and magnetic ring transformer T1, are in series with respectively resistance R 5, R6;
Described LC series resonant circuit is comprised of current-limiting inductance L2 and capacitor C 6, one end of capacitor C 6 is connected with the wire that the first terminals are drawn, the other end is connected with current-limiting inductance L2 through the armature winding of magnetic ring transformer T1, the other end of current-limiting inductance L2 is linked between the collector electrode of the emitter of triode Q1 and triode Q2, and is connected with the second terminals by it;
Described output rectification circuit is connected to form by diode D8, D9, D10, D11 bridge-type, the input of output rectification circuit is connected with the armature winding of the wire of drawing from the first terminals and magnetic ring transformer T1, and the output of output rectification circuit is connected with the series LED chipset.
Between the collector electrode of described triode Q1 and the second terminals, be parallel with capacitor C 4.
Between the emitter of described triode Q1 and base stage and between the emitter of triode Q2 and base stage, be in series with respectively diode D6 and D7, and the anode of diode D6, D7 is connected with the emitter of triode Q1, Q2 respectively.
The beneficial effects of the utility model are: circuit structure of the present utility model is reasonable, simple and reliable, stable performance, the control circuit element is few, be easy to embed in LED lighting small space, without the special constant-current control chip, utilize the accessory of easily buying to form, do not need expensive integrated IC, greatly reduce costs, cost performance is high; And can realize equally constant current control, and having overcome the problem that constant-current source drive chip exists fully, strong adaptability, can be widely used in all kinds of LED lightings.
The accompanying drawing explanation:
Fig. 1 is structural representation of the present utility model.
Embodiment:
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail:
shown in Figure 1, a kind of LED drive circuit that is formed by discrete component of the present utility model, include two input signal cables that are connected with external ac power source, wherein, after series connection insurance resistance R 8 on first input signal cable, together with second input signal cable, access by diode D1, D2, D3, D4 and capacitor C 2, the input of the current rectifying and wave filtering circuit that C3 forms, diode D1 wherein, D2, D3, D4 is that bridge-type connects, form rectification circuit, capacitor C 2, C3 is in series, form filter circuit, between rectification circuit and filter circuit for being connected in parallel,
The output of current rectifying and wave filtering circuit is connected to two branch roads parallel with one another, on the first parallel branch, is in series with resistance R 1, R2 and capacitor C 5; On the second parallel branch, be connected to triode Q1 and Q2, wherein after the emitter series resistance R3 of triode Q1, with the collector electrode of triode Q2, be connected, after the emitter series resistance R4 of triode Q2, together with the collector electrode of triode Q1, access the output of current rectifying and wave filtering circuit, between the emitter of triode Q1 and base stage and between the emitter of triode Q2 and base stage, be in series with respectively diode D6 and D7, and the anode of diode D6, D7 is connected with the emitter of triode Q1, Q2 respectively;
The base stage of the base stage of triode Q1 and emitter and triode Q2 and emitter are received respectively the two ends of two elementary taps of magnetic ring transformer T1, wherein, between two elementary taps of the base stage of triode Q1 and Q2 and magnetic ring transformer T1, be in series with respectively resistance R 5, R6; Between capacitor C 2 and C3, between resistance R 1 and R2 and be respectively equipped with first, second and third terminals between resistance R 2 and capacitor C 5, from the first terminals, draw wire, after series capacitance C6, the armature winding of access magnetic ring transformer T1 is connected with current-limiting inductance L2; From the second terminals, draw wire, between the emitter of access triode Q1 and the collector electrode of triode Q2 and pass, after the current-limiting inductance of connecting again L2, access is connected with the end of armature winding of the magnetic ring transformer T1 of capacitor C 6, between the wire of drawing from the second terminals and the collector electrode of triode Q1, is parallel with capacitor C 4; From the 3rd terminals, draw wire, after series connection bidirectional trigger diode DB3, receive again the base stage of triode Q2, between the wire of drawing from the second terminals and the wire of drawing from the 3rd terminals, also be connected to diode D5, and the anode of diode D5 is connected with the wire of drawing from the 3rd terminals;
Wherein, resistance R 1, R2, capacitor C 5 and bidirectional trigger diode DB3 form the integration circuits for triggering of half-bridge circuit; Triode Q1, Q2, magnetic ring transformer T1 and resistance R 3, R4, R5, R6 form half-bridge inversion circuit; Current-limiting inductance L2 and capacitor C 6 form the LC series resonant circuit;
Also include the output rectification circuit and the series LED chipset that by diode D8, D9, D10, D11, are formed, the input of output rectification circuit is connected with the armature winding of the wire of drawing from the first terminals and magnetic ring transformer T1, and the output of output rectification circuit is connected with the series LED chipset.
operation principle: after power on circuitry, current rectifying and wave filtering circuit provides DC bus voltage for half-bridge circuit, at first via resistance R 1, R2 is to capacitor C 5 chargings, reach the puncture voltage of bidirectional trigger diode DB3, at this moment triode Q2 base stage adds positively biased, conducting, because making base stage, the induced electromotive force of magnetic ring transformer T1 produces positive feedback, triode Q2 accelerates conducting to saturated, load current flowed to and was this moment: capacitor C 2, C3 voltage midpoint → capacitor C 6 → current-limiting inductance L2 → triode Q2 → resistance R 4 → negative pole (), magnetic ring transformer T1 is saturated gradually simultaneously, induced electromotive force descends, the Q2 base potential is reduced, exit saturated, magnetic ring transformer T1 positive feedback continuation effect makes its rapid cut-off, triode Q1 is due to the induced electromotive force conducting, saturated rapidly under the positive feedback effect of magnetic ring transformer T1, at this moment the flow direction of electric current is: positive source → triode Q1 → resistance R 3 → current-limiting inductance L2 → capacitor C 6 → capacitor C 3 → negative pole ().Triode Q1, Q2 alternate conduction like this, the circuit starting of oscillation, capacitor C 4 plays the afterflow effect, and capacitor C 5, after triode Q2 conducting, by diode D5 electric discharge, no longer acts on bidirectional trigger diode DB3.After the circuit starting of oscillation, capacitor C 6 alternating current components in resonant circuit provide drive current for the series LED chipset after by the rectification of diode D8-D11 bridge circuit, due to the voltage-current characteristic of load, after the series LED chipset is lighted, by current-limiting inductance L2, carry out chokes.
Claims (3)
1. the LED drive circuit that is comprised of discrete component, include integration circuits for triggering, half-bridge inversion circuit, LC series resonant circuit, output rectification circuit and the series LED chipset of two input signal cables being connected with external ac power source, current rectifying and wave filtering circuit, half-bridge circuit; It is characterized in that: after on first input signal cable that is connected with external ac power source, resistance R 8 is insured in series connection, together with second input signal cable, access the input of current rectifying and wave filtering circuit, the output of current rectifying and wave filtering circuit is connected to two branch roads parallel with one another, the first parallel branch connects the integration circuits for triggering of half-bridge circuit, on the second parallel branch, connects half-bridge inversion circuit;
Described current rectifying and wave filtering circuit is comprised of diode D1, D2, D3, D4 and capacitor C 2, C3, diode D1, D2, D3, D4 are that bridge-type connects, form rectification circuit, capacitor C 2, C3 are in series, form filter circuit, between rectification circuit and filter circuit for being connected in parallel, between capacitor C 2 and C3, be provided with the first terminals;
The integration circuits for triggering of described half-bridge circuit are comprised of the resistance R 1 that is connected in series, R2, capacitor C 5 and bidirectional trigger diode DB3, between resistance R 1 and R2, be provided with the second terminals, between resistance R 2 and capacitor C 5, be provided with the 3rd terminals, between the second terminals and the 3rd terminals, be connected with diode D5, and the anode of diode D5 is connected with the 3rd terminals;
Described half-bridge inversion circuit is by triode Q1, Q2, magnetic ring transformer T1 and resistance R 3, R4, R5, R6 form, after the emitter series resistance R3 of triode Q1, with the collector electrode of triode Q2, be connected, from the second terminals, draw wire, between the emitter of access triode Q1 and the collector electrode of triode Q2, after the emitter series resistance R4 of triode Q2, together with the collector electrode of triode Q1, access the output of current rectifying and wave filtering circuit, from the 3rd terminals, draw wire, after series connection bidirectional trigger diode DB3, receive the base stage of triode Q2; The base stage of the base stage of triode Q1 and emitter and triode Q2 and emitter are received respectively the two ends of two elementary taps of magnetic ring transformer T1, between two elementary taps of the base stage of triode Q1 and Q2 and magnetic ring transformer T1, are in series with respectively resistance R 5, R6;
Described LC series resonant circuit is comprised of current-limiting inductance L2 and capacitor C 6, one end of capacitor C 6 is connected with the wire that the first terminals are drawn, the other end is connected with current-limiting inductance L2 through the armature winding of magnetic ring transformer T1, the other end of current-limiting inductance L2 is linked between the collector electrode of the emitter of triode Q1 and triode Q2, and is connected with the second terminals by it;
Described output rectification circuit is connected to form by diode D8, D9, D10, D11 bridge-type, the input of output rectification circuit is connected with the armature winding of the wire of drawing from the first terminals and magnetic ring transformer T1, and the output of output rectification circuit is connected with the series LED chipset.
2. the LED drive circuit that is formed by discrete component according to claim 1, it is characterized in that: between the emitter of described triode Q1 and base stage and between the emitter of triode Q2 and base stage, be in series with respectively diode D6 and D7, and the anode of diode D6, D7 is connected with the emitter of triode Q1, Q2 respectively.
3. the LED drive circuit that is comprised of discrete component according to claim 2, is characterized in that: between the collector electrode of described triode Q1 and the second terminals, be parallel with capacitor C 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203533884U CN203301826U (en) | 2013-06-19 | 2013-06-19 | LED driving circuit composed of discrete components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203533884U CN203301826U (en) | 2013-06-19 | 2013-06-19 | LED driving circuit composed of discrete components |
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| Publication Number | Publication Date |
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| CN203301826U true CN203301826U (en) | 2013-11-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013203533884U Expired - Fee Related CN203301826U (en) | 2013-06-19 | 2013-06-19 | LED driving circuit composed of discrete components |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269553A (en) * | 2013-06-19 | 2013-08-28 | 安徽世林照明股份有限公司 | LED (light emitting diode) drive circuit based on constitution of discrete component parts |
| CN104270849A (en) * | 2014-09-16 | 2015-01-07 | 安徽春升新能源科技有限公司 | High-power alternating-current LED driver |
| CN105245110A (en) * | 2015-11-10 | 2016-01-13 | 潘秀兰 | DC boost circuit |
-
2013
- 2013-06-19 CN CN2013203533884U patent/CN203301826U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269553A (en) * | 2013-06-19 | 2013-08-28 | 安徽世林照明股份有限公司 | LED (light emitting diode) drive circuit based on constitution of discrete component parts |
| CN104270849A (en) * | 2014-09-16 | 2015-01-07 | 安徽春升新能源科技有限公司 | High-power alternating-current LED driver |
| CN105245110A (en) * | 2015-11-10 | 2016-01-13 | 潘秀兰 | DC boost circuit |
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| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20131120 Termination date: 20170619 |