CN210807727U - Power supply circuit for lamp strip - Google Patents
Power supply circuit for lamp strip Download PDFInfo
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- CN210807727U CN210807727U CN201921301921.6U CN201921301921U CN210807727U CN 210807727 U CN210807727 U CN 210807727U CN 201921301921 U CN201921301921 U CN 201921301921U CN 210807727 U CN210807727 U CN 210807727U
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Abstract
The utility model relates to the field of electronic technology, a power supply circuit for lamp area is disclosed, including rectifier module, filter module and a plurality of voltage reduction modules that connect in parallel, be connected with alternating current power supply through rectifier module, thereby convert alternating current into direct current, rectifier module passes through filter module and is connected with the input of each voltage reduction module, thereby filter this direct current, each voltage reduction module all has positive output and the negative pole output that is connected with the lamp area, supply power for the lamp area jointly through a plurality of voltage reduction modules that connect in parallel, thereby can satisfy high-power output, the complexity of current high-power supply circuit design has been avoided, thereby the circuit design of the power supply circuit of current high-power lamp area has been simplified; in addition, when one of them step-down module is unusual, can be for the lamp area power supply through all the other step-down modules to avoid whole lamp area not to have the output, thereby improved supply circuit's reliability.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a power supply circuit for lamp area.
Background
With the wider application range of LED lamps, more and more high-power high-brightness LEDs begin to enter the field of lighting, and in the prior art, there are various forms of LED lighting products, and lamp strips are widely used as an important type of LED lighting product. The traditional lamp belt is directly connected with a power supply through a power supply circuit, and the circuit design of the power supply circuit of the lamp belt is complex in the existing high-power lamp belt lighting.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a supply circuit for lamp area, its circuit design that can simplify the supply circuit in current high-power lamp area.
In order to solve the above technical problem, the present invention provides a power supply circuit for a light band, including a rectifying module, a filtering module and a plurality of voltage-reducing modules connected in parallel, wherein the rectifying module is used for being connected with an ac power supply, and the rectifying module is connected with an input end of each voltage-reducing module through the filtering module; each voltage reduction module is provided with a positive electrode output end and a negative electrode output end, and the positive electrode output end and the negative electrode output end are used for being connected with the lamp strip.
As a preferred scheme, each voltage reduction module comprises a first diode, a first inductor, a first capacitor, a first resistor, a switching tube and a PWM signal input end;
the anode output end, the cathode of the first diode and the anode of the first capacitor are respectively connected with the input end of the voltage reduction module, the anode of the first diode is connected with the cathode output end through the first inductor, and the cathode of the first capacitor is connected with the cathode output end;
the first connecting end of the switch tube is connected with the anode of the first diode, the second connecting end of the switch tube is grounded through the first resistor, and the control end of the switch tube is connected with the PWM signal input end.
As a preferred scheme, the switch tube is an N-channel MOS tube, the first connection end of the switch tube is a drain electrode of the N-channel MOS tube, the second connection end of the switch tube is a source electrode of the N-channel MOS tube, and the control end of the switch tube is a gate electrode of the N-channel MOS tube.
Preferably, each of the voltage reduction modules further includes a second resistor, and the positive output terminal is connected to the negative output terminal through the second resistor.
As a preferred scheme, each voltage reduction module comprises a second diode, a second inductor, a second capacitor and a PWM control chip;
the anode output end, the cathode of the second diode and the anode of the second capacitor are respectively connected with the input end of the voltage reduction module, the anode of the second diode is connected with the cathode output end through the second inductor, and the cathode of the second capacitor is connected with the cathode output end;
the power supply end of the PWM control chip is connected with the input end of the voltage reduction module, the drain end of the PWM control chip is connected with the anode of the second diode, and the grounding end of the PWM control chip is grounded.
Preferably, each of the voltage reduction modules further includes a third resistor, and the positive output terminal is connected to the negative output terminal through the third resistor.
Preferably, each of the voltage-reducing modules further includes a fourth resistor, the PWM control chip has an overvoltage protection terminal, and the overvoltage protection terminal of the PWM control chip is grounded through the fourth resistor.
As a preferred scheme, the rectifier module is a bridge rectifier module, the rectifier module includes a first ac input end, a second ac input end, a first output end and a second output end, the ac power supply includes a live wire connection end and a zero line connection end, the first ac input end is used for connecting with the live wire connection end, the second ac input end is used for connecting with the zero line connection end, the first output end passes through the filter module and each the input end of the voltage reduction module is connected, and the second output end is grounded.
As a preferred scheme, the filtering module includes a third capacitor and a fourth capacitor, an anode of the third capacitor and an anode of the fourth capacitor are respectively connected to the first output terminal, a cathode of the third capacitor and a cathode of the fourth capacitor are grounded, and an input terminal of each voltage reduction module is respectively connected to the first output terminal.
As a preferred scheme, the power supply circuit for the light strip further comprises a fuse, and the first alternating current input end is connected with the live wire connecting end through the fuse.
The utility model provides a power supply circuit for lamp area, including rectifier module, filtering module and a plurality of voltage reduction modules that connect in parallel, be connected with alternating current power supply through rectifier module, thereby convert alternating current into direct current, rectifier module passes through filtering module and is connected with the input of each voltage reduction module, thereby filter this direct current, each voltage reduction module all has positive output and the negative pole output of being connected with the lamp area, power is supplied for the lamp area jointly through a plurality of voltage reduction modules that connect in parallel, thereby can satisfy high-power output, the complexity of current high-power supply circuit design has been avoided, thereby the circuit design of the power supply circuit of current high-power lamp area has been simplified; in addition, when one of them step-down module is unusual, can be for the lamp area power supply through all the other step-down modules to avoid whole lamp area not to have the output, thereby improved supply circuit's reliability.
Drawings
Fig. 1 is a first part of a circuit schematic diagram of a power supply circuit according to a first embodiment of the present invention;
fig. 2 is a second part of the circuit schematic diagram of the power supply circuit according to the first embodiment of the present invention;
fig. 3 is a first part of a circuit schematic diagram of a power supply circuit according to a second embodiment of the present invention;
fig. 4 is a second part of the circuit schematic diagram of the power supply circuit according to the second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example one
With reference to fig. 1 to 2, a power supply circuit for a light strip according to a preferred embodiment of the present invention includes a rectifier module 1, a filter module 2, and a plurality of voltage reduction modules 3 connected in parallel, where the rectifier module 1 is used for being connected to an ac power supply, and the rectifier module 1 is connected to an input end of each of the voltage reduction modules 3 through the filter module 2; each of the buck modules 3 has a positive output V1+ and a negative output V1-, the positive output V1+ and the negative output V1-for connection to the light strip.
In the embodiment of the utility model, be connected with alternating current power supply through rectifier module 1, thereby convert the alternating current into the direct current, rectifier module 1 is connected with the input of each voltage reduction module 3 through filtering module 2, thereby filter this direct current, each voltage reduction module 3 all has positive output end V1+ and negative output end V1-be connected with the lamp area, supply power for the lamp area jointly through a plurality of voltage reduction modules 3 that connect in parallel, thereby can satisfy high-power output, the complexity of current high-power supply circuit design has been avoided, thereby the circuit design of the supply circuit in current high-power lamp area has been simplified; in addition, when one of them voltage reduction module 3 is unusual, can be for the lamp area power supply through all the other voltage reduction module 3 to avoid whole lamp area not to have the output, thereby improved supply circuit's reliability.
Referring to fig. 2, in the embodiment of the present invention, all the positive output terminals V1+ can be used as the positive signal output terminal OUT + of the power supply circuit, and all the negative output terminals V1-can be used as the negative signal output terminal OUT-of the power supply circuit, so as to supply power to the light strip through the positive signal output terminal OUT + and the negative signal output terminal OUT-. In addition, referring to FIG. 1, all ports labeled BUS are connected together.
Referring to fig. 1, in the embodiment of the present invention, each of the voltage dropping modules 3 includes a first diode D1, a first inductor T1, a first capacitor C1, a first resistor R1, a switching tube Q, and a PWM signal input end;
the positive electrode output end V1+, the negative electrode of the first diode D1 and the positive electrode of the first capacitor C1 are respectively connected to the input end of the voltage-reducing module 3, the positive electrode of the first diode D1 is connected to the negative electrode output end V1-through the first inductor T1, and the negative electrode of the first capacitor C1 is connected to the negative electrode output end V1-;
the first connection end of the switching tube Q is connected with the positive electrode of the first diode D1, the second connection end of the switching tube Q is grounded through the first resistor R1, and the control end of the switching tube Q is connected with the PWM signal input end.
Referring to fig. 1, in the embodiment of the present invention, the switch tube Q is preferably an N-channel MOS tube, the first connection end of the switch tube Q is a drain electrode of the N-channel MOS tube, the second connection end of the switch tube Q is a source electrode of the N-channel MOS tube, and the control end of the switch tube Q is a gate electrode of the N-channel MOS tube.
Referring to fig. 1, in the embodiment of the present invention, in order to improve the stability of the power supply circuit for the light strip during no-load, each of the voltage reduction modules 3 in this embodiment may further include a second resistor, and the positive output end V1+ is connected to the negative output end V1 "through the second resistor.
Referring to fig. 1, in the embodiment of the present invention, in order to realize converting the alternating current into the direct current, rectifier module 1 in this embodiment is a bridge rectifier module, rectifier module 1 includes first ac input terminal BD _3, second ac input terminal BD _2, first output terminal BD _4 and second output terminal BD _1, ac power supply includes live wire link end L and zero line link end N, first ac input terminal BD _3 be used for with live wire link end L connects, second ac input terminal BD _2 be used for with zero line link end N connects, first output terminal BD _4 passes through filter module 2 and each the input of voltage reduction module 3 is connected, second output terminal BD _1 ground connection.
Referring to fig. 1, in the embodiment of the present invention, in order to filter the converted direct current, the filtering module 2 in this embodiment includes a third capacitor C3 and a fourth capacitor C4, the positive electrode of the third capacitor C3 and the positive electrode of the fourth capacitor C4 are respectively connected to the first output terminal BD _4, the negative electrode of the third capacitor C3 and the negative electrode of the fourth capacitor C4 are grounded, and the input terminal of each voltage-reducing module 3 is respectively connected to the first output terminal BD _ 4.
Referring to fig. 1, in the embodiment of the present invention, in order to protect the power supply circuit for a light strip, the power supply circuit for a light strip in this embodiment further includes a fuse F1, and the first ac input terminal BD _3 is connected to the live wire connection terminal L through the fuse F1. In addition, the first ac input terminal BD _3 may be further connected to the second ac input terminal BD _2 through a voltage dependent resistor RZ, and the first ac input terminal BD _3 may be further connected to the second ac input terminal BD _2 through a safety capacitor CX.
With reference to fig. 1 to 2, the following describes in detail the operation principle of the power supply circuit for a light strip provided in this embodiment:
alternating current is converted into direct current through the rectifying module 1, filtering is performed through the third capacitor C3 and the fourth capacitor C4 which are connected in parallel, the voltage reducing module 3 forms a BUCK circuit, when a high level signal is input to a PWM signal input end, the switching tube Q is switched on, the first capacitor C1, the first inductor T1, the switching tube Q and the lamp strip form a loop, and the first inductor T1 charges; when a low-level signal is input to the PWM signal input terminal, the switching tube Q is turned off, the first inductor T1, the first diode D1 and the first capacitor C1 form a loop, and the first inductor T1 discharges; the voltage of the voltage reduction module 3 can be reduced by controlling the on or off of the switching tube Q; in addition, it is a plurality of 3 output voltage of step-down module extremely the lamp area to for the lamp area power supply, when one of them or a plurality of step-down module 3 is unusual, can be through all the other step-down module 3 for the lamp area power supply, in order to avoid whole lamp area not to have the output. In this embodiment, the number of the voltage reduction modules 3 is 4, the output power of each voltage reduction module 3 is 45W, and the 4 voltage reduction modules 3 are connected in parallel, so that the output power of the power supply circuit for the lamp strip is 180W, and the power supply of the high-power lamp strip is satisfied. Of course, the number of the voltage reduction modules 3 is not limited to 4, and the embodiment of the present invention exemplifies that the number of the voltage reduction modules 3 is 4, but the voltage reduction modules 3 of other numbers are all within the protection scope of the present invention.
Furthermore, in the embodiment of the utility model provides an in, a supply circuit for lamp area constitutes switching power supply, exports stable electric current for the lamp area has the light efficiency height, does not have stroboscopic advantage.
Example two
As shown in fig. 3 to fig. 4, the difference between the power supply circuit for a light strip of the present embodiment and the first embodiment is that each of the voltage-reducing modules 3 of the present embodiment includes a second diode D2, a second inductor T2, a second capacitor C2, and a PWM control chip U1;
the positive electrode output end V1+, the negative electrode of the second diode D2, and the positive electrode of the second capacitor C2 are respectively connected to the input end of the voltage-reducing module 3, the positive electrode of the second diode D2 is connected to the negative electrode output end V1-through the second inductor T2, and the negative electrode of the second capacitor C2 is connected to the negative electrode output end V1-;
the power supply end HVDD of the PWM control chip U1 is connected to the input end of the voltage-reducing module 3, the DRAIN end DRAIN of the PWM control chip U1 is connected to the anode of the second diode D2, and the ground end GND of the PWM control chip U1 is grounded. In specific implementation, the PWM control chip U1 is provided with a built-in switching tube, the built-in switching tube may be an N-channel MOS tube, and a DRAIN terminal DRAIN of the PWM control chip U1 is connected to a DRAIN of the built-in switching tube.
Referring to fig. 3, in the embodiment of the present invention, in order to improve the no-load stability of the power supply circuit for the light strip, each of the voltage reduction modules 3 in this embodiment further includes a third resistor R3, and the positive output terminal V1+ is connected to the negative output terminal V1 "through the third resistor R3.
Referring to fig. 3, in the embodiment of the present invention, each of the voltage dropping modules 3 further includes a fourth resistor R4, the PWM control chip U1 has an overvoltage protection terminal OVP, and the overvoltage protection terminal OVP of the PWM control chip U1 is grounded through the fourth resistor R4. In addition, each of the voltage dropping modules 3 further includes a fifth resistor R5, the PWM control chip U1 may further have a chip select terminal CS, and the chip select terminal CS of the PWM control chip U1 is grounded through the fifth resistor R5.
The operation principle of the power supply circuit for a light strip provided in this embodiment is described in detail below with reference to fig. 3 and 4:
alternating current is converted into direct current through the rectifying module 1, filtering is performed through the third capacitor C3 and the fourth capacitor C4 which are connected in parallel, the voltage reducing module 3 forms a BUCK circuit, when a DRAIN terminal DRAIN of the PWM control chip U1 outputs a low level, the second capacitor C2, the second inductor T2, the PWM control chip U1 and the lamp strip form a loop, and the second inductor T2 charges; when the DRAIN terminal DRAIN of the PWM control chip U1 has no output, the second inductor T2, the second diode D2, and the second capacitor C2 form a loop, and the second inductor T2 discharges; the voltage reduction of the voltage reduction module 3 can be realized by controlling the output of the DRAIN terminal DRAIN of the PWM control chip U1; in addition, it is a plurality of 3 output voltage of step-down module extremely the lamp area to for the lamp area power supply, when one of them or a plurality of step-down module 3 is unusual, can be through all the other step-down module 3 for the lamp area power supply, in order to avoid whole lamp area not to have the output. In this embodiment, the number of the voltage reduction modules 3 is 4, the output power of each voltage reduction module 3 is 45W, and the 4 voltage reduction modules 3 are connected in parallel, so that the output power of the power supply circuit for the lamp strip is 180W, and the power supply of the high-power lamp strip is satisfied. Of course, the number of the voltage reduction modules 3 is not limited to 4, and the embodiment of the present invention exemplifies that the number of the voltage reduction modules 3 is 4, but the voltage reduction modules 3 of other numbers are all within the protection scope of the present invention. Other structures and working principles of this embodiment are the same as those of the first embodiment, and will not be further described herein.
To sum up, the embodiment of the utility model provides a power supply circuit for lamp area, including rectifier module 1, filter module 2 and a plurality of voltage reduction module 3 that connect in parallel, be connected with alternating current power supply through rectifier module 1, thereby convert the alternating current into the direct current, rectifier module 1 is connected with the input of each voltage reduction module 3 through filter module 2, thereby filter this direct current, each voltage reduction module 3 all has the positive output end V1+ and the negative output end V1 of being connected with the lamp area, supply power for the lamp area jointly through a plurality of voltage reduction module 3 that connect in parallel, thereby can satisfy high-power output, the complexity of current high-power supply circuit design has been avoided, thereby the circuit design of the power supply circuit in current high-power lamp area has been simplified; in addition, when one of them voltage reduction module 3 is unusual, can be for the lamp area power supply through all the other voltage reduction module 3 to avoid whole lamp area not to have the output, thereby improved supply circuit's reliability.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (10)
1. A power supply circuit for a lamp strip is characterized by comprising a rectifying module, a filtering module and a plurality of voltage reduction modules connected in parallel, wherein the rectifying module is used for being connected with an alternating current power supply, and the rectifying module is connected with the input end of each voltage reduction module through the filtering module; each voltage reduction module is provided with a positive electrode output end and a negative electrode output end, and the positive electrode output end and the negative electrode output end are used for being connected with the lamp strip.
2. The power supply circuit for a light strip as claimed in claim 1, wherein each of the voltage reduction modules comprises a first diode, a first inductor, a first capacitor, a first resistor, a switch tube and a PWM signal input terminal;
the anode output end, the cathode of the first diode and the anode of the first capacitor are respectively connected with the input end of the voltage reduction module, the anode of the first diode is connected with the cathode output end through the first inductor, and the cathode of the first capacitor is connected with the cathode output end;
the first connecting end of the switch tube is connected with the anode of the first diode, the second connecting end of the switch tube is grounded through the first resistor, and the control end of the switch tube is connected with the PWM signal input end.
3. The power supply circuit for a light strip as claimed in claim 2, wherein the switch tube is an N-channel MOS tube, the first connection end of the switch tube is a drain electrode of the N-channel MOS tube, the second connection end of the switch tube is a source electrode of the N-channel MOS tube, and the control end of the switch tube is a gate electrode of the N-channel MOS tube.
4. The power supply circuit for a light strip as claimed in claim 2, wherein each of said voltage-reducing modules further comprises a second resistor, and said positive output terminal is connected to said negative output terminal through said second resistor.
5. The power supply circuit for a light strip according to claim 1, wherein each of the voltage-reducing modules comprises a second diode, a second inductor, a second capacitor and a PWM control chip;
the anode output end, the cathode of the second diode and the anode of the second capacitor are respectively connected with the input end of the voltage reduction module, the anode of the second diode is connected with the cathode output end through the second inductor, and the cathode of the second capacitor is connected with the cathode output end;
the power supply end of the PWM control chip is connected with the input end of the voltage reduction module, the drain end of the PWM control chip is connected with the anode of the second diode, and the grounding end of the PWM control chip is grounded.
6. The power supply circuit for a light strip as claimed in claim 5, wherein each of said voltage-reducing modules further comprises a third resistor, and said positive output terminal is connected to said negative output terminal through said third resistor.
7. The power supply circuit for a light strip as claimed in claim 5, wherein each of the voltage-reducing modules further comprises a fourth resistor, the PWM control chip has an over-voltage protection terminal, and the over-voltage protection terminal of the PWM control chip is grounded through the fourth resistor.
8. A supply circuit for a light strip as claimed in any one of claims 1 to 7, wherein said rectifying module is a bridge rectifying module, said rectifying module comprises a first AC input terminal, a second AC input terminal, a first output terminal and a second output terminal, said AC power supply comprises a live connection terminal and a neutral connection terminal, said first AC input terminal is for connecting with said live connection terminal, said second AC input terminal is for connecting with said neutral connection terminal, said first output terminal is connected with the input terminal of each of said voltage reducing modules through said filtering module, and said second output terminal is grounded.
9. The power supply circuit for a light strip as claimed in claim 8, wherein the filter module comprises a third capacitor and a fourth capacitor, an anode of the third capacitor and an anode of the fourth capacitor are respectively connected to the first output terminal, a cathode of the third capacitor and a cathode of the fourth capacitor are grounded, and an input terminal of each of the voltage-reducing modules is respectively connected to the first output terminal.
10. A supply circuit for a light strip as claimed in claim 8, characterized in that said supply circuit for a light strip further comprises a fuse, said first AC input being connected to said live connection terminal through said fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921301921.6U CN210807727U (en) | 2019-08-12 | 2019-08-12 | Power supply circuit for lamp strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921301921.6U CN210807727U (en) | 2019-08-12 | 2019-08-12 | Power supply circuit for lamp strip |
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| Publication Number | Publication Date |
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| CN210807727U true CN210807727U (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921301921.6U Expired - Fee Related CN210807727U (en) | 2019-08-12 | 2019-08-12 | Power supply circuit for lamp strip |
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| CN (1) | CN210807727U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113316284A (en) * | 2021-04-14 | 2021-08-27 | 厦门普为光电科技有限公司 | LED lamp with residual light preventing function |
-
2019
- 2019-08-12 CN CN201921301921.6U patent/CN210807727U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113316284A (en) * | 2021-04-14 | 2021-08-27 | 厦门普为光电科技有限公司 | LED lamp with residual light preventing function |
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