CN215073059U - LED drive circuit - Google Patents
LED drive circuit Download PDFInfo
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- CN215073059U CN215073059U CN202121301977.9U CN202121301977U CN215073059U CN 215073059 U CN215073059 U CN 215073059U CN 202121301977 U CN202121301977 U CN 202121301977U CN 215073059 U CN215073059 U CN 215073059U
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Abstract
The utility model discloses a LED drive circuit, including first emitting diode, the second emitting diode, the third emitting diode, the triode, first resistance and second resistance, the one end and one of them pin of singlechip of first resistance are connected, second resistance one end, the triode base, second emitting diode's positive pole and third emitting diode negative pole all are connected with the other end of first resistance, the other end and the triode projecting pole of second resistance all are connected with external power supply, the anodal collecting electrode with the triode of first emitting diode is connected, first emitting diode negative pole, the anodal another pin with the singlechip of second emitting diode negative pole and third emitting diode is connected. The three light-emitting diodes are connected and controlled by connecting each element with two pins of the single chip microcomputer, the two single chip microcomputer I/O ports can be used for driving, one single chip microcomputer I/O port is less than that used for normal driving, and connection of the residual interfaces and other devices is facilitated.
Description
Technical Field
The utility model belongs to a drive circuit especially relates to a LED drive circuit.
Background
The control circuit board of small household electrical appliances uses a control chip which is generally a 51-chip microcomputer, and usually, due to the problem of cost or space, the 51-chip microcomputer with the number of pins just enough needs to be selected. The number of the light emitting diodes on the control board is determined according to the requirements of specific products, and besides the light emitting diodes, other devices need to use an I/O port of the 51 single chip microcomputer. At this moment, after the scheme is settled, the I/O port of the 51 single chip microcomputer which is often selected is not enough, so that the connection and the use of other devices are limited.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a LED drive circuit can solve at least one in the above-mentioned problem.
According to an aspect of the utility model, a LED drive circuit is provided, including first emitting diode, the second emitting diode, the third emitting diode, the triode, first resistance and second resistance, the one end of first resistance is connected with one of them pin electricity of singlechip, the one end of second resistance, the base of triode, the anodal of second emitting diode and third emitting diode's negative pole all is connected with the other end electricity of first resistance, the other end of second resistance and the projecting pole of triode all are connected with external power supply electricity, first emitting diode's positive pole is connected with the collecting electrode electricity of triode, first emitting diode's negative pole, second emitting diode's negative pole and third emitting diode's positive pole all are connected with another pin electricity of singlechip.
The utility model has the advantages that: the connection control of three light emitting diodes including the first light emitting diode, the second light emitting diode and the third light emitting diode is realized by connecting each element with two pins of the single chip microcomputer, namely, the three light emitting diodes can be driven by using two single chip microcomputer I/O ports, one single chip microcomputer I/O port is less than that in normal driving, and the residual interfaces are conveniently and electrically connected with other devices.
In some embodiments, the LED driving circuit further comprises a fourth resistor connected in series with the second light emitting diode, one end of the fourth resistor is electrically connected to the other end of the first resistor, and the other end is electrically connected to the positive electrode of the second light emitting diode. Therefore, the fourth resistor is arranged, so that the current limiting effect on the second light-emitting diode can be achieved, and the uniformity of the brightness of the second light-emitting diode is guaranteed.
In some embodiments, the LED driving circuit further includes a fifth resistor, the fifth resistor is connected in series with the third light emitting diode, one end of the fifth resistor is electrically connected to the anode of the third light emitting diode, and the other end of the fifth resistor is electrically connected to another pin of the single chip. Therefore, the fifth resistor is arranged, the current limiting effect on the third light emitting diode can be achieved, and the third light emitting diode is favorably ensured to be uniform in brightness.
In some embodiments, the LED driving circuit further includes a third resistor, the transistor is electrically connected to the first light emitting diode through the third resistor, one end of the third resistor is electrically connected to the collector of the transistor, and the other end of the third resistor is electrically connected to the anode of the first light emitting diode. Therefore, the third resistor is arranged, so that the current limiting effect on the first light emitting diode can be achieved, and the stability of current is facilitated.
In some embodiments, the LED driving circuit further includes a third resistor, and the emitter of the triode is electrically connected to the external power source through the third resistor. Therefore, the third resistor is arranged, so that the current limiting effect on the first light emitting diode can be achieved, and the stability of current is facilitated.
In some embodiments, the LED driving circuit further includes a first capacitor, the first capacitor is connected in parallel with the first light emitting diode, and one end of the first capacitor is electrically connected to another pin of the single chip. Therefore, the first capacitor is arranged to play an anti-interference role in the other pin of the single chip microcomputer.
In some embodiments, the LED driving circuit further includes a first capacitor, the first capacitor is connected in parallel with the first light emitting diode, and one end of the first capacitor is electrically connected to another pin of the single chip. Therefore, the first capacitor is arranged to play an anti-interference role in the other pin of the single chip microcomputer.
Drawings
Fig. 1 is a circuit diagram of a third embodiment of an LED driving circuit according to the present invention;
fig. 2 is a circuit diagram of a first embodiment of an LED driving circuit according to the present invention;
fig. 3 is a circuit diagram of a second embodiment of the LED driving circuit according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 3: an LED driving circuit comprises a first LED1, a second LED2, a third LED3, a triode Q1, a first resistor R1 and a second resistor R2, wherein one end of the first resistor R1 is electrically connected with one pin of a single chip microcomputer, one end of the second resistor R2, a base of the triode Q1, an anode of the second LED2 and a cathode of the third LED3 are electrically connected with the other end of a first resistor R1, the other end of the second resistor R2 and an emitter of the triode Q1 are electrically connected with an external power supply, an anode of the first LED1 is electrically connected with a collector of the triode Q1, and a cathode of the first LED1, a cathode of the second LED2 and an anode of the third LED3 are electrically connected with the other pin of the single chip microcomputer. Wherein, the electric connection mentioned in the utility model is all through the wire electricity connection, and one of them pin of singlechip is marked pLED1 or pLED-A in the specification figure, and another pin of singlechip is marked pLED2 or pLED-B in the specification figure.
The connection control of three light-emitting diodes including the first light-emitting diode LED1, the second light-emitting diode LED2 and the third light-emitting diode LED3 is realized by connecting each element with two pins of the single chip microcomputer, namely, the three light-emitting diodes can be driven by using two I/O ports of the single chip microcomputer, and one I/O port of the single chip microcomputer is less than that of the normal driving. Specifically, when all lamps are not on, two pins of the single chip microcomputer are set to output high level; when the first light-emitting diode LED1 needs to be lightened, one pin of the singlechip is set to output low level, and the other pin is set to output low level; when the second light emitting diode LED2 needs to be lightened, one pin of the singlechip is set to output high level, and the other pin is set to output low level; when the third light emitting diode LED3 needs to be lit, one pin of the single chip microcomputer is set to output low level, and the other pin is set to output high level.
The utility model discloses a LED drive circuit still includes fourth resistance R4, and fourth resistance R4 establishes ties with second emitting diode LED2, and fourth resistance R4's one end is connected with first resistance R1's other end electricity, and the other end is connected with second emitting diode LED 2's anodal electricity. Therefore, the fourth resistor R4 is arranged, so that the current limiting effect on the second light-emitting diode LED2 can be achieved, and the uniformity of the brightness of the second light-emitting diode can be guaranteed.
The utility model discloses a LED drive circuit still includes fifth resistance R5, and fifth resistance R5 establishes ties with third emitting diode LED3, and fifth resistance R5's one end and third emitting diode LED 3's anodal electric connection, the other end is connected with another pin electricity of singlechip. Therefore, the fifth resistor R5 is arranged, so that the current limiting effect on the third light emitting diode LED3 can be achieved, and the uniformity of the brightness of the third light emitting diode LED3 can be guaranteed.
In an embodiment, as shown in fig. 2, the LED driving circuit of the present invention further includes a third resistor R3, the transistor Q1 is electrically connected to the first light emitting diode LED1 through the third resistor R3, one end of the third resistor R3 is electrically connected to the collector of the transistor Q1, and the other end is electrically connected to the anode of the first light emitting diode LED 1.
In a second embodiment, as shown in fig. 1, the LED driving circuit of the present invention further includes a first capacitor C1, the first capacitor C1 is connected in parallel with the first LED1, and one end of the first capacitor C1 is electrically connected to another pin of the single chip. Therefore, the first capacitor C1 is arranged, and the first capacitor C1 plays a role in resisting interference on the other pin of the single chip microcomputer.
In a third embodiment, as shown in fig. 3, the LED driving circuit of the present invention further includes a third resistor R3, and the emitter of the transistor Q1 is electrically connected to the external power source through the third resistor R3.
The utility model discloses a LED drive circuit still includes first electric capacity C1, and first electric capacity C1 is connected with first emitting diode LED1 electricity, and first electric capacity C1's one end is connected with another pin electricity of singlechip. Therefore, the first capacitor C1 is arranged, and the first capacitor C1 plays a role in resisting interference on the other pin of the single chip microcomputer.
The above is only the preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the inventive concept, and these all fall into the protection scope of the present invention.
Claims (7)
1. The LED driving circuit is characterized by comprising a first light emitting diode (LED1), a second light emitting diode (LED2), a third light emitting diode (LED3), a triode (Q1), a first resistor (R1) and a second resistor (R2), wherein one end of the first resistor (R1) is electrically connected with one pin of a single chip microcomputer, one end of the second resistor (R2), a base of the triode (Q1), an anode of the second light emitting diode (LED2) and a cathode of the third light emitting diode (LED3) are electrically connected with the other end of the first resistor (R1), the other end of the second resistor (R2) and an emitter of the triode (Q1) are electrically connected with an external power supply, an anode of the first light emitting diode (LED1) is electrically connected with a collector of the triode (Q1), a cathode of the first light emitting diode (LED1), a cathode of the second light emitting diode (LED2) and an anode of the third light emitting diode (LED3) are electrically connected with the other pin of the single chip microcomputer (R3) .
2. The LED driving circuit according to claim 1, further comprising a fourth resistor (R4), wherein the fourth resistor (R4) is connected in series with the second light emitting diode (LED2), one end of the fourth resistor (R4) is electrically connected to the other end of the first resistor (R1), and the other end is electrically connected to the positive electrode of the second light emitting diode (LED 2).
3. The LED driving circuit according to claim 2, further comprising a fifth resistor (R5), wherein the fifth resistor (R5) is connected in series with the third light emitting diode (LED3), one end of the fifth resistor (R5) is electrically connected to the positive electrode of the third light emitting diode (LED3), and the other end of the fifth resistor (R5) is electrically connected to the other pin of the single chip microcomputer.
4. An LED driving circuit according to claim 3, further comprising a third resistor (R3), wherein the transistor (Q1) is electrically connected to the first light emitting diode (LED1) through the third resistor (R3), one end of the third resistor (R3) is electrically connected to the collector of the transistor (Q1), and the other end of the third resistor (R3) is electrically connected to the anode of the first light emitting diode (LED 1).
5. The LED driving circuit according to claim 3, further comprising a third resistor (R3), wherein the emitter of the transistor (Q1) is electrically connected to an external power source through the third resistor (R3).
6. The LED driving circuit according to claim 4, further comprising a first capacitor (C1), wherein the first capacitor (C1) is connected in parallel with the first light emitting diode (LED1), and one end of the first capacitor (C1) is electrically connected to another pin of the single chip microcomputer.
7. The LED driving circuit according to claim 5, further comprising a first capacitor (C1), wherein the first capacitor (C1) is connected in parallel with the first light emitting diode (LED1), and one end of the first capacitor (C1) is electrically connected to another pin of the single chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121301977.9U CN215073059U (en) | 2021-06-10 | 2021-06-10 | LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121301977.9U CN215073059U (en) | 2021-06-10 | 2021-06-10 | LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215073059U true CN215073059U (en) | 2021-12-07 |
Family
ID=79205471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121301977.9U Active CN215073059U (en) | 2021-06-10 | 2021-06-10 | LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215073059U (en) |
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2021
- 2021-06-10 CN CN202121301977.9U patent/CN215073059U/en active Active
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