CN104661416A - Power supply circuit for LED colored lamp - Google Patents
Power supply circuit for LED colored lamp Download PDFInfo
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- CN104661416A CN104661416A CN201510114661.1A CN201510114661A CN104661416A CN 104661416 A CN104661416 A CN 104661416A CN 201510114661 A CN201510114661 A CN 201510114661A CN 104661416 A CN104661416 A CN 104661416A
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Abstract
The invention discloses a power supply circuit for an LED colored lamp. The power supply circuit is connected between the alternating-current commercial power and an LED and comprises a voltage transformation circuit, a rectifying circuit, a filtering circuit and a voltage stabilizing circuit which are connected in sequence, wherein the output end of the filtering circuit is connected with a direct-current conversion circuit for converting fixed direct-current voltage into changeable direct-current voltage; the feedback signal input end of the direct-current conversion circuit is connected with a compensation circuit, and the output end of the compensation circuit is connected with the feedback input end of the direct-current conversion circuit; the output end of the direct-current conversion circuit is connected with the LED. The power supply circuit is characterized in that the direct-current conversion circuit is arranged between the rectifying circuit and the LED colored lamp, so that the fixed direct-current voltage is converted into the changeable direct-current voltage to accommodate the constantly changed voltage when the LED colored lamp is dimmed.
Description
Technical field
The present invention relates to a kind of power circuit for LED color lamp.
Background technology
Color lamp is a kind of by adopting pea lamp mode of connecting to couple together, become a unit that can cut, be arranged on the lamp body of transparent PVC, conductive electric wire extrusion molding, and be connected on parallel way on the electric wire in lamp body, then in the line-type decoration light fixture of lamp body outer cladding one deck PVC.Energising can make whole piece irradiancy of colored light, is called Chang Liang; Feeder controller can make whole color lamp glimmer or slowly bright, slowly go out, be called light modulation, also can produce and chase effect.But traditional be phase control rectifier circuit for controlling the Direct Current Governor System of color lamp.Though its circuit is simple, in dark control off line side, power factor declines, grid current harmonic content dynamic response that is high, voltage-regulation is slow.Further, due to local existence decay a lot of in circuit, often cause circuit working unstable.
Summary of the invention
The object of this invention is to provide a kind of power circuit for LED color lamp, slow with the power circuit dynamic response solving existing LED color lamp, and the problem of job insecurity.
For solving the problems of the technologies described above, the invention provides a kind of power circuit for LED color lamp, it is connected between electric main and LED, comprises the transforming circuit, rectification circuit, filter circuit and the voltage stabilizing circuit that connect successively; The output of filter circuit is connected with the DC converting circuit that fixing DC voltage conversion is variable direct voltage by; The feedback signal input terminal of DC converting circuit is connected with compensating circuit, and the output of compensating circuit is connected with the feedback input end of DC converting circuit; The output of DC converting circuit is connected to LED.
Compensating circuit comprises error amplifier A, be connected serially to the 6th resistance R6 of the negative input end of error amplifier A and the second rheostat P2 successively, be connected serially to the 6th electric capacity C6, the 8th resistance R8 of the output of error amplifier A and the 7th resistance R7 successively and be connected in parallel on the 7th electric capacity C7 at the 8th resistance R8 and the 6th electric capacity C6 two ends; Wherein, the negative input end of error amplifier A is also connected between the 8th resistance R8 and the 7th resistance R7, the positive input terminal ground connection of error amplifier A.
DC converting circuit is the H bridging parallel operation be made up of the first transistor Q1, transistor seconds Q2, third transistor Q3 and the 4th transistor Q4; Wherein the first transistor Q1 and transistor seconds Q2 is input, is connected to output and the ground of voltage stabilizing circuit respectively; Third transistor Q3 and the 4th transistor Q4 is output; The other end of the 7th resistance R7 is connected between the first transistor Q1 and transistor seconds Q2; The other end of the second rheostat P2 is connected between third transistor Q3 and the 4th transistor Q4.
Further, transforming circuit comprises transformer T, is arranged on the fuse FU on the Same Name of Ends of transformer T former limit inductance coil, and is arranged on the first resistance R1 on the different name end of transformer T former limit inductance coil.
Further, rectification circuit is be arranged on the full-bridge type rectification circuit on transformer T secondary.
Further, filter circuit comprises the first electric capacity C1 being arranged on rectification circuit output end, is connected in the 3rd resistance R3 and the second electric capacity C2 at the first electric capacity C1 two ends after series connection in parallel; The second resistance R2 is in series with between first electric capacity C1 and the 3rd resistance R3; Second resistance R2 and the 3rd resistance R3 is connected to the input of voltage stabilizing circuit by the 4th resistance R4.
Further, voltage stabilizing circuit comprises pressurizer U, be connected in parallel on the first diode D1 between the output of pressurizer U and input, be connected on the 5th resistance R5 between the output of pressurizer U and ground and the first rheostat P1 successively, be connected in parallel on the second diode D2 at the 5th resistance R5 two ends, and be connected in parallel on the 4th electric capacity C4 at the first rheostat P1 two ends; The control end of pressurizer U is also connected between the 5th resistance R5 and the first rheostat P1; The input of pressurizer U is also by the 3rd electric capacity C3 ground connection; The output of pressurizer U is connected to the first transistor Q1.
Beneficial effect of the present invention is:
1, the present invention is provided with DC converting circuit between rectification circuit and LED color lamp, can be variable direct voltage by fixing DC voltage conversion, to adapt to the voltage needs that LED color lamp constantly changes when light modulation.
2, the present invention is provided with compensating circuit, can by comparing output current and the LED color lamp electric current of DC converting circuit, and obtain regulating error signal according to both errors, and this regulating error signal is sent to DC converting circuit to control turning on and off of each transistor, with regulation output voltage, thus the change of the electric current of control LED color lamp.
Accompanying drawing explanation
Fig. 1 is the structural representation of preferred embodiment.
Embodiment
Below the specific embodiment of the present invention is described; so that those skilled in the art understand the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present invention determined, these changes are apparent, and all innovation and creation utilizing the present invention to conceive are all at the row of protection in appended claim.
The power circuit applying to LED color lamp as shown in Figure 1, it is connected between electric main and LED, comprises the transforming circuit, rectification circuit, filter circuit and the voltage stabilizing circuit that connect successively; The output of filter circuit is connected with the DC converting circuit that fixing DC voltage conversion is variable direct voltage by; The feedback signal input terminal of DC converting circuit is connected with compensating circuit, and the output of compensating circuit is connected with the feedback input end of DC converting circuit; The output of DC converting circuit is connected to LED.
Respectively each assembly is described in detail below:
Compensating circuit comprises error amplifier A, be connected serially to the 6th resistance R6 of the negative input end of error amplifier A and the second rheostat P2 successively, be connected serially to the 6th electric capacity C6, the 8th resistance R8 of the output of error amplifier A and the 7th resistance R7 successively and be connected in parallel on the 7th electric capacity C7 at the 8th resistance R8 and the 6th electric capacity C6 two ends; Wherein, the negative input end of error amplifier A is also connected between the 8th resistance R8 and the 7th resistance R7, the positive input terminal ground connection of error amplifier A.
DC converting circuit is the H bridging parallel operation be made up of the first transistor Q1, transistor seconds Q2, third transistor Q3 and the 4th transistor Q4; Wherein the first transistor Q1 and transistor seconds Q2 is input, is connected to output and the ground of voltage stabilizing circuit respectively; Third transistor Q3 and the 4th transistor Q4 is output; The other end of the 7th resistance R7 is connected between the first transistor Q1 and transistor seconds Q2; The other end of the second rheostat P2 is connected between third transistor Q3 and the 4th transistor Q4.
According to an embodiment of the application, transforming circuit comprises transformer T, is arranged on the fuse FU on the Same Name of Ends of transformer T former limit inductance coil, and is arranged on the first resistance R1 on the different name end of transformer T former limit inductance coil.
According to an embodiment of the application, rectification circuit is be arranged on the full-bridge type rectification circuit on transformer T secondary.
According to an embodiment of the application, filter circuit comprises the first electric capacity C1 being arranged on rectification circuit output end, is connected in the 3rd resistance R3 and the second electric capacity C2 at the first electric capacity C1 two ends after series connection in parallel; The second resistance R2 is in series with between first electric capacity C1 and the 3rd resistance R3; Second resistance R2 and the 3rd resistance R3 is connected to the input of voltage stabilizing circuit by the 4th resistance R4.
According to an embodiment of the application, voltage stabilizing circuit comprises pressurizer U, be connected in parallel on the first diode D1 between the output of pressurizer U and input, be connected on the 5th resistance R5 between the output of pressurizer U and ground and the first rheostat P1 successively, be connected in parallel on the second diode D2 at the 5th resistance R5 two ends, and be connected in parallel on the 4th electric capacity C4 at the first rheostat P1 two ends; The control end of pressurizer U is also connected between the 5th resistance R5 and the first rheostat P1; The input of pressurizer U is also by the 3rd electric capacity C3 ground connection; The output of pressurizer U is connected to the first transistor Q1.
The course of work of this power circuit is as follows:
After powering on, civil power obtains galvanic current pressure successively after transforming circuit, rectification circuit, filter circuit and voltage stabilizing circuit; Then this direct voltage output is to DC converting circuit, and galvanic current pressure is converted into variable direct voltage.In addition, compensating circuit can by comparing output current and the LED color lamp electric current of DC converting circuit, and obtain regulating error signal according to both errors, and this regulating error signal is sent to DC converting circuit controls turning on and off of its each transistor, with regulation output voltage, thus the change of the electric current of control LED color lamp.
Claims (5)
1. for a power circuit for LED color lamp, it is connected between electric main and LED, it is characterized in that, comprises the transforming circuit, rectification circuit, filter circuit and the voltage stabilizing circuit that connect successively; The output of described filter circuit is connected with the DC converting circuit that fixing DC voltage conversion is variable direct voltage by; The feedback signal input terminal of described DC converting circuit is connected with compensating circuit, and the output of described compensating circuit is connected with the feedback input end of described DC converting circuit; The output of described DC converting circuit is connected to described LED;
Described compensating circuit comprises error amplifier A, is connected serially to the 6th resistance R6 of the negative input end of described error amplifier A and the second rheostat P2, the 6th electric capacity C6 being connected serially to the output of described error amplifier A successively, the 8th resistance R8 and the 7th resistance R7 successively and is connected in parallel on the 7th electric capacity C7 at described 8th resistance R8 and the 6th electric capacity C6 two ends; Wherein, the negative input end of described error amplifier A is also connected between described 8th resistance R8 and the 7th resistance R7, the positive input terminal ground connection of described error amplifier A;
Described DC converting circuit is the H bridging parallel operation be made up of the first transistor Q1, transistor seconds Q2, third transistor Q3 and the 4th transistor Q4; Wherein the first transistor Q1 and transistor seconds Q2 is input, is connected to output and the ground of described voltage stabilizing circuit respectively; Described third transistor Q3 and the 4th transistor Q4 is output; The other end of described 7th resistance R7 is connected between the first transistor Q1 and transistor seconds Q2; The other end of described second rheostat P2 is connected between described third transistor Q3 and the 4th transistor Q4.
2. the power circuit applying to LED color lamp according to claim 1, it is characterized in that, described transforming circuit comprises transformer T, be arranged on the fuse FU on the Same Name of Ends of described transformer T former limit inductance coil, and be arranged on the first resistance R1 on the different name end of described transformer T former limit inductance coil.
3. the power circuit applying to LED color lamp according to claim 1, is characterized in that, described rectification circuit is be arranged on the full-bridge type rectification circuit on described transformer T secondary.
4. the power circuit applying to LED color lamp according to claim 1, it is characterized in that, described filter circuit comprises the first electric capacity C1 being arranged on described rectification circuit output end, is connected in the 3rd resistance R3 and the second electric capacity C2 at described first electric capacity C1 two ends after series connection in parallel; The second resistance R2 is in series with between described first electric capacity C1 and described 3rd resistance R3; Described second resistance R2 and the 3rd resistance R3 is connected to the input of described voltage stabilizing circuit by the 4th resistance R4.
5. the power circuit applying to LED color lamp according to claim 1, it is characterized in that, described voltage stabilizing circuit comprises pressurizer U, be connected in parallel on the first diode D1 between the output of described pressurizer U and input, be connected on the 5th resistance R5 between the output of described pressurizer U and ground and the first rheostat P1 successively, be connected in parallel on the second diode D2 at described 5th resistance R5 two ends, and be connected in parallel on the 4th electric capacity C4 at the first rheostat P1 two ends; The control end of described pressurizer U is connected between described 5th resistance R5 and the first rheostat P1; The input of described pressurizer U is also by the 3rd electric capacity C3 ground connection; The output of described pressurizer U is connected to described the first transistor Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114661.1A CN104661416A (en) | 2015-03-17 | 2015-03-17 | Power supply circuit for LED colored lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114661.1A CN104661416A (en) | 2015-03-17 | 2015-03-17 | Power supply circuit for LED colored lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104661416A true CN104661416A (en) | 2015-05-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510114661.1A Pending CN104661416A (en) | 2015-03-17 | 2015-03-17 | Power supply circuit for LED colored lamp |
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| CN (1) | CN104661416A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014179994A1 (en) * | 2013-05-10 | 2014-11-13 | Shanghai Sim-Bcd Semiconductor Manufacturing Co., Ltd. | Power supply for led lamp with triac dimmer |
| CN203967988U (en) * | 2014-06-25 | 2014-11-26 | 中国科学院上海应用物理研究所 | A kind of scanning power supply for generation of class triangular wave exciting current |
| CN204518146U (en) * | 2015-03-17 | 2015-07-29 | 成都禾睿电子产品有限公司 | For the power circuit of LED color lamp |
-
2015
- 2015-03-17 CN CN201510114661.1A patent/CN104661416A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014179994A1 (en) * | 2013-05-10 | 2014-11-13 | Shanghai Sim-Bcd Semiconductor Manufacturing Co., Ltd. | Power supply for led lamp with triac dimmer |
| CN203967988U (en) * | 2014-06-25 | 2014-11-26 | 中国科学院上海应用物理研究所 | A kind of scanning power supply for generation of class triangular wave exciting current |
| CN204518146U (en) * | 2015-03-17 | 2015-07-29 | 成都禾睿电子产品有限公司 | For the power circuit of LED color lamp |
Non-Patent Citations (1)
| Title |
|---|
| SHANGDONG8421: "LM317三端可调稳压器的应用（经典）", 《百度文库》 * |
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Application publication date: 20150527 |
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