CN217522976U - LED lamp driving circuit - Google Patents
LED lamp driving circuit Download PDFInfo
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- CN217522976U CN217522976U CN202221343523.2U CN202221343523U CN217522976U CN 217522976 U CN217522976 U CN 217522976U CN 202221343523 U CN202221343523 U CN 202221343523U CN 217522976 U CN217522976 U CN 217522976U
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Abstract
The application discloses an LED lamp driving circuit, which relates to the technical field of electronic circuits and comprises a first conversion sub-circuit, a first rectification filter sub-circuit and a first current limiting sub-circuit, wherein the first conversion sub-circuit is connected with an alternating current power supply and is used for converting input alternating current voltage; the first rectifying and filtering sub-circuit is connected with the first conversion sub-circuit; the first current limiting sub-circuit is connected with the first rectifying and filtering sub-circuit; the first current limiting sub-circuit is used for being connected with the anode of the first light-emitting diode group, and the first rectifying and filtering sub-circuit is used for being connected with the cathode of the first light-emitting diode group; the LED lamp driving circuit has the effect of reducing the possibility of damage to the driving circuit of the LED lamp.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to an LED lamp driving circuit.
Background
The LED lamp is an electroluminescent semiconductor material chip, is usually solidified on a bracket by silver glue or white glue, then is connected with the chip and a circuit board by silver wires or gold wires, is sealed by epoxy resin at the periphery, and is finally provided with a shell, so the LED lamp has good anti-seismic performance and is usually used as a carrier marker lamp.
In the related technology, a driving circuit of an LED lamp used as a carrier marker lamp is connected with alternating current 220V voltage, and a worker controls the on-off of a relay through a control box so as to control the on-off of the driving circuit of the LED lamp, thereby controlling the on-off of a light-emitting diode group; the light emitting diode group comprises a plurality of light emitting diodes which are connected in series or in parallel.
In view of the above-described related art, the inventors found that: since the driving circuit of the LED lamp is generally hard to endure the flash signal, i.e., the voltage signal of AC220V, for a long time, the possibility of the driving circuit of the LED lamp being damaged is high.
SUMMERY OF THE UTILITY MODEL
In order to reduce the possibility of damage to a driving circuit of an LED lamp, the application provides the driving circuit of the LED lamp.
An LED lamp driver circuit comprising:
the first conversion sub-circuit is connected with an alternating current power supply and is used for converting an input alternating current voltage;
the first rectifying and filtering sub-circuit is connected with the first conversion sub-circuit; and (c) a second step of,
the first current limiting sub-circuit is connected with the first rectifying and filtering sub-circuit;
the first current limiting sub-circuit is used for being connected with the anode of the first light-emitting diode group, and the first rectifying and filtering sub-circuit is used for being connected with the cathode of the first light-emitting diode group;
the first conversion sub-circuit comprises:
a first fuse F1, one pole of which is connected with the AC power supply; and the number of the first and second groups,
a first step-down transformer T1, one end of the primary coil of the first step-down transformer T1 being connected to the other pole of the first fuse F1, and the other end being connected to the ac power supply; the secondary coil of the first step-down transformer T1 is connected with the first rectifying and filtering sub-circuit.
Through adopting above-mentioned technical scheme, first conversion sub-circuit can transform the alternating voltage of input, through first step-down transformer T1 with the higher voltage in primary coil both ends of first step-down transformer T1 promptly, converts the lower voltage in secondary coil both ends of first step-down transformer T1 into, and then has reduced the voltage of inputing in first rectification filter sub-circuit and the first current-limiting sub-circuit to the possibility that LED lamp drive circuit damaged has been reduced.
Optionally, the first rectifying and filtering sub-circuit includes:
a first bridge stack D1, one AC input terminal AC of the first bridge stack D1 being connected to one end of the secondary winding of the first step-down transformer T1, the other AC input terminal AC being connected to the other end of the secondary winding of the first step-down transformer T1; a positive polarity direct current output terminal V + of the first bridge stack D1 is connected to the first current limiting sub-circuit, and a negative polarity direct current output terminal V-is connected to a cathode for the first light emitting diode group;
a first capacitor C1, the positive pole of which is connected to the positive dc output terminal V + of the first bridge D1, and the negative pole of which is connected to the negative dc output terminal V-of the first bridge D1; and (c) a second step of,
a third capacitor C3 connected in parallel with the first capacitor C1.
By adopting the technical scheme, the first bridge stack D1 is used for rectification, the first step-down transformer T1 inputs the converted alternating-current voltage into the first bridge stack D1, and the first bridge stack D1 converts the converted alternating-current voltage into direct-current voltage, namely, an alternating-current signal entering the first bridge stack D1 is converted into a direct-current signal; the first capacitor C1 and the third capacitor C3 are used for filtering, i.e., filtering out the ac signal of the dc signal.
Optionally, the first current limiting sub-circuit includes:
a first resistor R1, having one end connected to the positive dc output terminal V + of the first bridge D1 and the other end connected to the anode of the first led group;
a second resistor R2 connected in parallel with the first resistor R1;
a third resistor R3 connected in parallel with the first resistor R1; and the number of the first and second groups,
a fourth resistor R4 connected in parallel with the first resistor R1.
By adopting the technical scheme, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 are used for limiting current, and the possibility that the circuit is damaged due to overlarge current in the circuit is reduced.
Optionally, the first capacitor C1 is an electrolytic capacitor.
By adopting the technical scheme, the first capacitor C1 is an electrolytic capacitor, and the electrolytic capacitor generally has larger capacitance; the third capacitor C3 is a common nonpolar capacitor with small capacitance; the first capacitor C1 is mainly used to filter out low frequency components in the ac signal, and the third capacitor C3 is mainly used to filter out high frequency components in the ac signal.
Optionally, the driving circuit further includes:
the second conversion sub-circuit is connected with the alternating current power supply and is used for converting the input alternating current voltage;
the second rectifying and filtering sub-circuit is connected with the second conversion sub-circuit; and the number of the first and second groups,
the second current limiting sub-circuit is connected with the second rectifying and filtering sub-circuit;
the second current limiting sub-circuit is used for being connected with the anode of a second light-emitting diode group, and the second rectifying and filtering sub-circuit is used for being connected with the cathode of the second light-emitting diode group.
By adopting the technical scheme, when the driving circuit where the first light-emitting diode group is located cannot work normally, the worker starts the driving circuit where the second light-emitting diode group is located to drive the second light-emitting diode group to work.
Optionally, the second converting sub-circuit includes:
a second fuse F2 having one terminal connected to the ac power supply; and the number of the first and second groups,
a second step-down transformer T2, one end of the primary coil of the second step-down transformer T2 being connected to the other pole of the second fuse F2, and the other end being connected to the ac power supply; the secondary coil of the second step-down transformer T2 is connected with the second rectifying and filtering sub-circuit.
By adopting the technical scheme, when the driving circuit where the first light-emitting diode group is located is damaged, the worker starts the driving circuit where the second light-emitting diode group is located, so that the second light-emitting diode group is driven to work.
Optionally, the second rectifying and filtering sub-circuit includes:
a second bridge stack D2, one AC input terminal AC of the second bridge stack D2 being connected to one end of the secondary winding of the second step-down transformer T2, the other AC input terminal AC being connected to the other end of the secondary winding of the second step-down transformer T2; a positive polarity direct current output end V + of the second bridge stack D2 is connected with the second current limiting sub-circuit, and a negative polarity direct current output end V-is used for being connected with the cathode of the second light emitting diode group;
a second capacitor C2, the positive pole of which is connected to the positive dc output terminal V + of the second bridge D2, and the negative pole of which is connected to the negative dc output terminal V-of the second bridge D2; and the number of the first and second groups,
a fourth capacitor C4 connected in parallel with the second capacitor C2.
By adopting the above technical scheme, the second bridge stack D2 is used for rectification, after the second step-down transformer T2 inputs the converted alternating-current voltage into the second bridge stack D2, the second bridge stack D2 converts the converted alternating-current voltage into direct-current voltage, that is, the alternating-current signal entering the second bridge stack D2 is converted into a direct-current signal; the second capacitor C2 and the fourth capacitor C4 are used for filtering, i.e., filtering out the ac signal of the dc signal.
Optionally, the second current limiting sub-circuit includes:
a fifth resistor R5, having one end connected to the positive dc output terminal V + of the second bridge D2 and the other end connected to the anode of the second led group;
a sixth resistor R6 connected in parallel with the fifth resistor R5;
a seventh resistor R7 connected in parallel with the fifth resistor R5; and the number of the first and second groups,
an eighth resistor R8 connected in parallel with the fifth resistor R5.
By adopting the technical scheme, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 play a role in limiting current, and the possibility of circuit damage caused by overlarge current in a circuit is reduced.
Optionally, the second capacitor C2 is an electrolytic capacitor.
By adopting the technical scheme, the second capacitor C2 is an electrolytic capacitor, and the electrolytic capacitor generally has larger capacitance; the fourth capacitor C4 is a common nonpolar capacitor with small capacitance; the second capacitor C2 is mainly used to filter out low frequency components in the ac signal, and the fourth capacitor C4 is mainly used to filter out high frequency components in the ac signal.
In summary, the present application at least includes the following beneficial technical effects: when the first LED group is operating normally, the first converting sub-circuit converts the input ac voltage, that is, the first step-down transformer T1 converts the higher voltage across the primary winding of the first step-down transformer T1 into the lower voltage across the secondary winding of the first step-down transformer T1, thereby reducing the voltage input into the first rectifying-filtering sub-circuit and the first current-limiting sub-circuit, and reducing the possibility of damage to the LED lamp driving circuit.
Drawings
Fig. 1 is a circuit diagram of an LED lamp driving circuit according to an embodiment of the present application.
Fig. 2 is a circuit diagram of a first light emitting diode group of an LED lamp driving circuit according to an embodiment of the present application.
Fig. 3 is a circuit diagram of a second light emitting diode group of the LED lamp driving circuit according to the embodiment of the present application.
Description of the reference numerals: 1. a first conversion sub-circuit; 2. a first rectifying-filtering sub-circuit; 3. a first current limiting sub-circuit; 4. a first light emitting diode group; 5. a second conversion sub-circuit; 6. a second rectifying-filtering sub-circuit; 7. a second current limiting sub-circuit; 8. a second light emitting diode group.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-3 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The embodiment of the application discloses a light-emitting diode (LED) lamp driving circuit.
Referring to fig. 1 and 2, an LED lamp driving circuit includes a first converting sub-circuit 1, a first rectifying-filtering sub-circuit 2, and a first current limiting sub-circuit 3. The first converting sub-circuit 1 is connected to an ac power source, and the first converting sub-circuit 1 is configured to convert an input ac voltage, that is, the first converting sub-circuit 1 converts an input higher voltage into a lower voltage; the first rectifying and filtering sub-circuit 2 is connected with the first converting sub-circuit 1, and the first rectifying and filtering sub-circuit 2 is used for rectifying and filtering the current output by the first converting sub-circuit 1; the first current limiting sub-circuit 3 is connected to the first rectifying and filtering sub-circuit 2, and the first current limiting sub-circuit 3 is used for limiting current. The first current limiting sub-circuit 3 is used for being connected with the anode of the first light emitting diode group 4, and the first rectifying and filtering sub-circuit 2 is used for being connected with the cathode of the first light emitting diode group 4; the first led group 4 includes a plurality of first leds D1, the first leds D1 may be connected in series or in parallel, and in this embodiment, the first leds D1 are connected in series.
With continued reference to fig. 1, the first conversion sub-circuit 1 includes a first fuse F1 and a first step-down transformer T1. One pole of the first fuse F1 is connected with an alternating current power supply; one end of the primary coil of the first step-down transformer T1 is connected to the other pole of the first fuse F1, and the other end of the primary coil of the first step-down transformer T1 is connected to an ac power supply; the secondary winding of the first step-down transformer T1 is connected to the first rectifying-filtering sub-circuit 2. In the present embodiment, J1 is an interface for supplying 220V ac power; the first step-down transformer T1 converts the input 220V ac power into 24V ac power. The first step-down transformer T1 reduces the voltage input to the first rectifying-filtering sub-circuit 2 and the first current-limiting sub-circuit 3 by converting the input higher voltage into a lower voltage, thereby reducing the possibility of damage to the LED lamp driving circuit.
Referring to fig. 1, as an embodiment of the first rectifying-filtering sub-circuit 2, the first rectifying-filtering sub-circuit 2 includes a first bridge stack D1, a first capacitor C1, and a third capacitor C3. One AC input terminal AC of the first bridge stack D1 is connected to one end of the secondary coil of the first step-down transformer T1, and the other AC input terminal AC of the first bridge stack D1 is connected to the other end of the secondary coil of the first step-down transformer T1; the first bridge D1 has a positive dc output terminal V + connected to the first current limiting sub-circuit 3 and a negative dc output terminal V-connected to the cathode for the first group of leds 4. The positive pole of the first capacitor C1 is connected with the positive-polarity direct-current output end V + of the first bridge stack D1, and the negative pole of the first capacitor C1 is connected with the negative-polarity direct-current output end V-of the first bridge stack D1; the third capacitor C3 is connected in parallel with the first capacitor C1. In this embodiment, the first capacitor C1 is an electrolytic capacitor with a working voltage of 50V and a capacitance of 2200 μ F, and the third capacitor C3 is a nonpolar capacitor with a capacitance of 0.1 μ F; j4 is an interface connecting the first step-down transformer T1 and the first bridge stack D1.
Referring to fig. 1, as an embodiment of the first current limiting sub-circuit 3, the first current limiting sub-circuit 3 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. One end of the first resistor R1 is connected to the positive dc output terminal V + of the first bridge stack D1, and the other end of the first resistor R1 is connected to the anode of the first led group 4; the second resistor R2 is connected in parallel with the first resistor R1; the third resistor R3 is connected in parallel with the first resistor R1; the fourth resistor R4 is connected in parallel with the first resistor R1. In the present embodiment, the resistance values of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 are all 10 ohms.
Referring to fig. 1 and 3, the driving circuit further includes a second converting sub-circuit 5, a second rectifying-filtering sub-circuit 6, and a second current limiting sub-circuit 7. The second conversion sub-circuit 5 is connected with an alternating current power supply, and the second conversion sub-circuit 5 is used for converting the input alternating current voltage; the second rectifying and filtering sub-circuit 6 is connected with the second converting sub-circuit 5, and the second rectifying and filtering sub-circuit 6 is used for rectifying and filtering the current output by the second converting sub-circuit 5; the second current limiting sub-circuit 7 is connected to the second rectifying and filtering sub-circuit 6, and the second current limiting sub-circuit 7 is used for limiting current. The second current limiting sub-circuit 7 is used for being connected with the anode of the second light-emitting diode group 8, and the second rectifying and filtering sub-circuit 6 is used for being connected with the cathode of the second light-emitting diode group 8; the second led group 8 includes a plurality of second leds D2 connected in series or in parallel.
Referring to fig. 1, as an embodiment of the second converting sub-circuit 5, the second converting sub-circuit 5 includes a second fuse F2 and a second step-down transformer T2. One pole of the second fuse tube F2 is connected with an alternating current power supply; one end of the primary coil of the second step-down transformer T2 is connected to the other pole of the second fuse F2, and the other end of the primary coil of the second step-down transformer T2 is connected to the ac power supply; the secondary winding of the second step-down transformer T2 is connected to the second rectifying-filtering sub-circuit 6. Wherein J2 is the interface that provides 220V alternating current.
Referring to fig. 1, the second rectifying-filtering sub-circuit 6 includes a second bridge stack D2, a second capacitor C2, and a fourth capacitor C4 as an embodiment of the second rectifying-filtering sub-circuit 6. One AC input terminal AC of the second bridge stack D2 is connected to one end of the secondary coil of the second step-down transformer T2, and the other AC input terminal AC of the second bridge stack D2 is connected to the other end of the secondary coil of the second step-down transformer T2; a positive direct current output end V + of the second bridge stack D2 is connected with the second current limiting sub-circuit 7, and a negative direct current output end V-of the second bridge stack D2 is used for being connected with the cathode of the second light-emitting diode group 8; the anode of the second capacitor C2 is connected with the positive polarity dc output terminal V + of the second bridge stack D2, and the cathode of the second capacitor C2 is connected with the negative polarity dc output terminal V-of the second bridge stack D2; the fourth capacitor C4 is connected in parallel with the second capacitor C2. In this embodiment, the second capacitor C2 is an electrolytic capacitor with a working voltage of 50V and a capacitance of 2200 μ F, and the fourth capacitor C4 is a nonpolar capacitor with a capacitance of 0.1 μ F; j4 is also the interface connecting the second step-down transformer T2 and the second bridge stack D2.
Referring to fig. 1, as an embodiment of the second current limiting sub-circuit 7, the second current limiting sub-circuit 7 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. One end of the fifth resistor R5 is connected to the positive dc output terminal V + of the second bridge D2, and the other end of the fifth resistor R5 is connected to the anode of the second led group 8; the sixth resistor R6 is connected in parallel with the fifth resistor R5; the seventh resistor R7 is connected in parallel with the fifth resistor R5; the eighth resistor R8 is connected in parallel with the fifth resistor R5. In the present embodiment, the resistance values of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are all 10 ohms; j5 is a driving interface for the first and second led groups 4 and 8.
The basic principle of the LED lamp driving circuit of the embodiment of the application is as follows: the first converting sub-circuit 1 converts the input higher ac voltage into a lower ac voltage through the first step-down transformer T1, thereby reducing the ac voltage input to the first rectifying and filtering sub-circuit 2, and thus reducing the possibility of damage to the driving circuit where the first led group 4 is located; when the driving circuit of the first led group 4 is damaged, the operator starts the driving circuit of the second led group 8 to drive the second led group 8 to work.
The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Claims (9)
1. An LED lamp driver circuit, comprising:
the first conversion sub-circuit (1) is connected with an alternating current power supply and is used for converting an input alternating current voltage;
a first rectifying-filtering sub-circuit (2) connected to the first converter sub-circuit (1); and the number of the first and second groups,
the first current limiting sub-circuit (3) is connected with the first rectifying and filtering sub-circuit (2);
the first current limiting sub-circuit (3) is used for being connected with the anode of a first light-emitting diode group (4), and the first rectifying and filtering sub-circuit (2) is used for being connected with the cathode of the first light-emitting diode group (4);
the first conversion sub-circuit (1) comprises:
a first fuse tube F1, one pole of which is connected with the AC power supply; and the number of the first and second groups,
a first step-down transformer T1, one end of the primary coil of the first step-down transformer T1 being connected to the other pole of the first fuse F1, and the other end being connected to the ac power supply; the secondary coil of the first step-down transformer T1 is connected with the first rectifying and filtering sub-circuit (2).
2. An LED lamp driving circuit according to claim 1, wherein the first rectifying-filtering sub-circuit (2) comprises:
a first bridge stack D1, one AC input terminal AC of the first bridge stack D1 being connected to one end of the secondary winding of the first step-down transformer T1, the other AC input terminal AC being connected to the other end of the secondary winding of the first step-down transformer T1; a positive polarity direct current output end V + of the first bridge stack D1 is connected with the first current limiting sub-circuit (3), and a negative polarity direct current output end V-is connected with a cathode for the first light emitting diode group (4);
a first capacitor C1, having a positive electrode connected to the positive dc output terminal V + of the first bridge stack D1 and a negative electrode connected to the negative dc output terminal V-of the first bridge stack D1; and (c) a second step of,
a third capacitor C3 connected in parallel with the first capacitor C1.
3. An LED lamp driving circuit according to claim 2, wherein the first current limiting sub-circuit (3) comprises:
a first resistor R1, one end of which is connected to the positive dc output terminal V + of the first bridge D1 and the other end of which is connected to the anode of the first led group (4);
a second resistor R2 connected in parallel with the first resistor R1;
a third resistor R3 connected in parallel with the first resistor R1; and the number of the first and second groups,
a fourth resistor R4 connected in parallel with the first resistor R1.
4. The LED lamp driving circuit according to claim 2, wherein the first capacitor C1 is an electrolytic capacitor.
5. The LED lamp driver circuit of claim 1, further comprising:
a second converter sub-circuit (5) connected to the AC power supply for converting the input AC voltage;
a second rectifying-filtering sub-circuit (6) connected to the second converter sub-circuit (5); and the number of the first and second groups,
the second current limiting sub-circuit (7) is connected with the second rectifying and filtering sub-circuit (6);
the second current limiting sub-circuit (7) is used for being connected with the anode of a second light-emitting diode group (8), and the second rectifying and filtering sub-circuit (6) is used for being connected with the cathode of the second light-emitting diode group (8).
6. An LED lamp driving circuit as claimed in claim 5, wherein the second converter sub-circuit (5) comprises:
a second fuse F2 having one terminal connected to the ac power supply; and (c) a second step of,
a second step-down transformer T2, one end of the primary coil of the second step-down transformer T2 being connected to the other pole of the second fuse F2, and the other end being connected to the ac power supply; the secondary coil of the second step-down transformer T2 is connected with the second rectifying and filtering sub-circuit (6).
7. An LED lamp driving circuit according to claim 6, wherein said second rectifying-filtering sub-circuit (6) comprises:
a second bridge stack D2, one AC input terminal AC of the second bridge stack D2 being connected to one end of the secondary winding of the second step-down transformer T2, the other AC input terminal AC being connected to the other end of the secondary winding of the second step-down transformer T2; a positive polarity direct current output end V + of the second bridge stack D2 is connected with the second current limiting sub-circuit (7), and a negative polarity direct current output end V-is used for being connected with the cathode of the second light emitting diode group (8);
a second capacitor C2, having a positive electrode connected to the positive dc output terminal V + of the second bridge stack D2 and a negative electrode connected to the negative dc output terminal V-of the second bridge stack D2; and the number of the first and second groups,
a fourth capacitor C4 connected in parallel with the second capacitor C2.
8. An LED lamp driver circuit according to claim 7, wherein said second current limiting sub-circuit (7) comprises:
a fifth resistor R5, one end of which is connected to the positive dc output terminal V + of the second bridge D2 and the other end of which is connected to the anode of the second led group (8);
a sixth resistor R6 connected in parallel with the fifth resistor R5;
a seventh resistor R7 connected in parallel with the fifth resistor R5; and the number of the first and second groups,
an eighth resistor R8 connected in parallel with the fifth resistor R5.
9. The LED lamp driving circuit as claimed in claim 7, wherein the second capacitor C2 is an electrolytic capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221343523.2U CN217522976U (en) | 2022-05-19 | 2022-05-19 | LED lamp driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221343523.2U CN217522976U (en) | 2022-05-19 | 2022-05-19 | LED lamp driving circuit |
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| Publication Number | Publication Date |
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| CN217522976U true CN217522976U (en) | 2022-09-30 |
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| CN202221343523.2U Active CN217522976U (en) | 2022-05-19 | 2022-05-19 | LED lamp driving circuit |
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| CN (1) | CN217522976U (en) |
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