Control circuit of two-wire double-color LED lamp
By designing a two-wire two-color LED lamp control circuit driven by complementary signals, the combination of transistors and resistors is used to solve the problems of insufficient power supply capacity and power loss, and the lighting color determination and power efficiency are improved, ensuring accurate status indication.
Patent Information
- Application Number
- CN202420432822.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-06
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-03-06
AI Technical Summary
The existing two-wire two-color LED light control method has problems with insufficient power supply capacity and additional power loss, and the lighting color is uncertain, resulting in an incorrect indication.
A two-line two-color LED lamp control circuit including a first driving circuit, a second driving circuit and a totem pole circuit are designed. Driven by complementary signals, the current flow direction is flipped by a combination of transistors and resistors, and a current limiting resistor is shared. , ensure that the light color is determined and the power loss is small.
It realizes strong power supply capacity, reduces additional power loss, ensures the lighting color of the two-color LED lamp, accurately indicates the machine status, and reduces the power consumption of the control circuit.
Smart Images
Figure CN222263076U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of LED lamp driving circuits, in particular to a control circuit for a two-line dual-color LED lamp. Background Art
[0002] For different types of electrical appliances or electrical equipment, in order to clearly know their working status, there is generally a human-computer interaction interface, on which various colored LED lights can well indicate the working status of the machine. Two-color LED lights are widely used, of which two-line two-color LED lights are one of them. It is equivalent to two LED lights with opposite polarity directions connected in parallel, and different current flows produce different colors of light; the common control method is to drive directly by the MCU pin, or to use the high and low switching of the collectors of two controlled transistors to achieve the reversal of the current flow direction; but it comes with insufficient power supply capacity or the need for two current limiting resistors, one of which will always bring additional power loss, and the light color of the LED light may be in various uncertain states, resulting in wrong indications. Utility Model Content
[0003] In view of this, it is necessary to provide a two-wire dual-color LED lamp control circuit with strong power supply capability, small additional power loss and certain light color.
[0004] A control circuit for a two-wire bicolor LED lamp comprises a first drive circuit, a second drive circuit, a totem pole circuit, and a bicolor LED lamp, wherein an input terminal DRIVE1 of the first drive circuit and an input terminal DRIVE of the second drive circuit are respectively connected to a complementary drive signal input terminal, an output terminal of the first drive circuit and an output terminal of the second drive circuit are respectively connected to a first input terminal of the totem pole circuit and a second input terminal of the totem pole circuit, a first output terminal of the totem pole circuit is connected to one end of the bicolor LED lamp, and a second output terminal of the totem pole circuit is connected to the other end of the bicolor LED lamp.
[0005] Furthermore, the first driving circuit includes a transistor Q1, a resistor R1, a resistor R2, a resistor R3, and a capacitor C1, one end of the resistor R1 is connected to the input end of the first driving circuit, the other end of the resistor R1 is connected to one end of the resistor R2 and is also connected to the base of the transistor Q1, the other end of the resistor R2 is grounded, the capacitor C1 is connected in parallel with the resistor R2, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to one end of the resistor R3 and is connected to the first input end of the totem pole circuit as the output end of the first driving circuit, the other end of the resistor R3 is connected to the base of the transistor Q1, the other end of the resistor R2 is grounded, the capacitor C1 is connected in parallel with the resistor R2, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to one end of the resistor R3 and is connected to the first input end of the totem pole circuit as the output end of the first driving circuit, One end is connected to the power supply 12V, the first drive circuit and the second drive circuit are the same, the second drive circuit includes a transistor Q6, a resistor R5, a resistor R6, a resistor R4, and a capacitor C2, the input end DRIVE of the second drive circuit is connected to one end of the resistor R5, the collector of the transistor Q6 is connected to one end of the resistor R4 and is connected to the second input end of the totem pole circuit as the output end of the second drive circuit, the output end of the second drive circuit is also connected to the input end DRIVE1 of the first drive circuit, and the other end of the resistor R4 is connected to the power supply 12V.
[0006] Furthermore, the totem pole circuit includes transistors Q2, Q3, Q4, Q5, and resistor R7. The base of transistor Q2 and the base of transistor Q3 are connected together as the first input end of the totem pole circuit. The emitter of transistor Q2 and the emitter of transistor Q3 are connected together as the first output end of the totem pole circuit to directly drive the LED lamp. The collector of transistor Q2 is connected to one end of resistor R7, and the other end of resistor R7 is connected to the power supply 12V. The collector of transistor Q3 is connected to the power supply 12V. The base of the transistor Q4 and the base of the transistor Q5 are connected together as the second input end of the totem pole circuit, the emitter of the transistor Q4 and the emitter of the transistor Q5 are connected together as the second output end of the totem pole circuit to directly drive the LED lamp, the collector of the transistor Q4 is connected to one end of the resistor R7 and is also connected to the collector of the transistor Q2, the collector of the transistor Q5 is connected to the ground, the resistor R7 is a current limiting resistor, and the transistors Q2 and Q4 share a current limiting resistor.
[0007] Furthermore, the bicolor LED lamp is formed by connecting two LED diodes of different colors in reverse polarity in parallel. One end of the bicolor LED lamp is connected to the positive pole of the DC voltage, and the other end of the bicolor LED lamp is connected to the negative pole of the DC voltage, so that one color of the LED lamp is lit. Conversely, when one end of the bicolor LED lamp is connected to the negative pole of the DC voltage and the other end of the bicolor LED lamp is connected to the positive pole of the DC voltage, the other color of the LED lamp is lit. The resistor R7 is used to control the current when the bicolor LED lamp LED1 is lit, and the resistance value of the resistor R7 is adjusted to change the brightness of the bicolor LED lamp.
[0008] Specifically, the control circuit of the two-wire two-color LED lamp is driven by a complementary signal, the voltages of the complementary signals are the same but the voltage polarities are opposite, when the voltage of the complementary signal at the input terminal DRIVE1 of the first drive circuit is positive and the voltage of the complementary signal at the input terminal DRIVE of the second drive circuit is negative, the first drive circuit outputs a low level to the first input terminal of the totem pole circuit, causing the transistor Q2 to be turned off, the transistor Q3 to be turned on, and the first output terminal of the totem pole circuit outputs a low level, and at the same time, the second drive circuit outputs a high level to the second input terminal of the totem pole circuit, causing the transistor Q5 to be turned off, the transistor Q4 to be turned on, and the totem pole circuit The second output terminal outputs a high level to light up an LED lamp of one color; when the voltage of the complementary signal of the input terminal DRIVE1 of the first drive circuit is negative and the voltage of the complementary signal of the input terminal DRIVE of the second drive circuit is positive, the first drive circuit outputs a high level to the first input terminal of the totem pole circuit, causing the transistor Q2 to be turned on, the transistor Q3 to be turned off, and the first output terminal of the totem pole circuit outputs a high level. At the same time, the second drive circuit outputs a low level to the second input terminal of the totem pole circuit, causing the transistor Q5 to be turned on, the transistor Q4 to be turned off, and the second output terminal of the totem pole circuit outputs a low level to light up an LED lamp of another color.
[0009] In the control circuit of the above-mentioned two-wire two-color LED lamp, the drive signal DEIVE and the drive signal DRIVE1 are complementary signals. Since the complementary signal voltages are of the same magnitude and opposite voltage polarities, the control circuit of the two-wire two-color LED lamp achieves an interlocking effect, ensuring that the lighting state of the two-color LED lamp is determined and unique, so that only one color of LED light is lit during the working time of the two-color LED lamp, accurately indicating the status of the machine, and sharing one current limiting resistor, which can reduce the power consumption of the control circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 This is a control circuit schematic diagram of a two-wire dual-color LED lamp according to an embodiment of the utility model. DETAILED DESCRIPTION
[0011] The present invention will be described in detail below with reference to specific embodiments and accompanying drawings.
[0012] See also Figure 1, showing a control circuit of a two-wire dual-color LED lamp provided by an embodiment of the utility model, including a first drive circuit, a second drive circuit, a totem pole circuit, and a dual-color LED lamp LED1, the first drive circuit input terminal DRIVE1 and the second drive circuit input terminal DRIVE are respectively connected to the complementary drive signal input terminal, the output terminal of the first drive circuit and the output terminal of the second drive circuit are respectively connected to the first input terminal and the second input terminal of the totem pole circuit, the first output terminal of the totem pole circuit is connected to one end of the dual-color LED lamp LED1, and the second output terminal is connected to the other end of the dual-color LED lamp LED1.
[0013] Furthermore, the first driving circuit includes a transistor Q1, a resistor R1, a resistor R2, a resistor R3, and a capacitor C1, one end of the resistor R1 is connected to the input end of the first driving circuit, the other end of the resistor R1 is connected to one end of the resistor R2 and is also connected to the base of the transistor Q1, the other end of the resistor R2 is grounded, the capacitor C1 is connected in parallel with the resistor R2, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to one end of the resistor R3 and is connected to the first input end of the totem pole circuit as the output end of the first driving circuit, the other end of the resistor R3 is connected to the base of the transistor Q1, the other end of the resistor R2 is grounded, the capacitor C1 is connected in parallel with the resistor R2, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to one end of the resistor R3 and is connected to the first input end of the totem pole circuit as the output end of the first driving circuit, One end is connected to the power supply 12V, the first drive circuit and the second drive circuit are the same, the first drive circuit includes a transistor Q6, a resistor R5, a resistor R6, a resistor R4, and a capacitor C2, an input end DRIVE of the second drive circuit is connected to one end of the resistor R5, a collector of the transistor Q6 is connected to one end of the resistor R4 and is connected to the second input end of the totem pole circuit as the output end of the second drive circuit, the output end of the second drive circuit is also connected to the input end DRIVE1 of the first drive circuit, and the other end of the resistor R4 is connected to the power supply 12V.
[0014] Furthermore, the totem pole circuit includes transistors Q2, Q3, Q4, Q5, and resistor R7. The base of transistor Q2 and the base of transistor Q3 are connected together as the first input end of the totem pole circuit. The emitter of transistor Q2 and the emitter of transistor Q3 are connected together as the first output end of the totem pole circuit to directly drive the LED lamp LED1. The collector of transistor Q2 is connected to one end of resistor R7, and the other end of resistor R7 is connected to the power supply 12V. The collector of transistor Q3 is connected to one end of resistor R7, and the other end of resistor R7 is connected to the power supply 12V. The electrode is connected to the ground; the base of the transistor Q4 and the base of the transistor Q5 are connected together as the second input end of the totem pole circuit, the emitter of the transistor Q4 and the emitter of the transistor Q5 are connected together as the second output end of the totem pole circuit to directly drive the LED lamp LED1, the collector of the transistor Q4 is connected to one end of the resistor R7, and the collector of the transistor Q2 is connected, and the collector of the transistor Q5 is connected to the ground, the resistor R7 is a current limiting resistor, and the transistor Q2 and the transistor Q4 share a current limiting resistor.
[0015] Furthermore, the bicolor LED lamp LED1 is formed by connecting a red LED diode and a green LED diode in parallel with opposite polarity. One end of the bicolor LED lamp LED1 is connected to the positive pole of the DC voltage, and the other end of the bicolor LED lamp LED1 is connected to the negative pole of the DC voltage, so that the LED diode lamp of one color is lit. Conversely, one end of the bicolor LED lamp LED1 is connected to the negative pole of the DC voltage, and the other end of the bicolor LED lamp is connected to the positive pole of the DC voltage, so that the LED diode lamp of another color is lit. The resistor R7 is used to control the current when the bicolor LED lamp LED1 is lit, and the resistance value of the resistor R7 is adjusted to change the brightness of the bicolor LED lamp LED1.
[0016] Specifically, the control circuit of the two-wire bicolor LED lamp is driven by a complementary signal, the voltage magnitudes of the complementary signals are the same, and the voltage polarities are opposite. When the voltage of the complementary signal at the input terminal DRIVE1 of the first drive circuit is positive and the voltage of the complementary signal at the input terminal DRIVE of the second drive circuit is negative, the first drive circuit outputs a low level to the first input terminal of the totem pole circuit, causing the transistor Q2 to be cut off, the transistor Q3 to be turned on, and the first output terminal of the totem pole outputs a low level. At the same time, the second drive circuit outputs a high level to the second input terminal of the totem pole circuit, causing the transistor Q5 to be cut off, the transistor Q4 to be turned on, and the second output terminal of the totem pole outputs a high level. The red LED diode of the bicolor LED lamp LED1 lights up, and the bicolor LED lamp LED1 displays red. When the voltage of the complementary signal at the input terminal DRIVE1 of the first drive circuit is negative, the second The voltage of the complementary signal of the input terminal DRIVE of the driving circuit is positive, and the first driving circuit outputs a high level to the first input terminal of the totem pole circuit, causing the transistor Q2 to be turned on, the transistor Q3 to be turned off, and the first output terminal of the totem pole outputs a high level. At the same time, the second driving circuit outputs a low level to the second input terminal of the totem pole circuit, causing the transistor Q5 to be turned on, the transistor Q4 to be turned off, and the second output terminal of the totem pole outputs a low level. The green LED diode of the two-color LED lamp LED1 is on, and the two-color LED lamp LED1 displays green, accurately indicating the status of the machine. The first driving circuit and the second driving circuit use a resistor voltage divider input circuit, and the two-color LED lamp LED1 shares the resistor R7 as a current limiting resistor, which can reduce the power loss of the circuit. The resistor voltage divider input circuits of the first driving circuit and the second driving circuit are connected to capacitors, which can improve the anti-interference performance.
[0017] In the control circuit of the above-mentioned two-wire two-color LED lamp, the drive signal DEIVE and the drive signal DRIVE1 are complementary signals. Since the complementary signal voltages are of the same magnitude and opposite voltage polarities, the control circuit of the two-wire two-color LED lamp achieves an interlocking effect, ensuring that the lighting state of the two-color LED lamp is determined and unique, so that only one color of the LED lamp is lit during the working time of the two-color LED lamp, and a current limiting resistor is shared, which can reduce the power consumption of the control circuit.
[0018] It should be noted that the present invention is not limited to the above-mentioned embodiments. According to the creative spirit of the present invention, those skilled in the art may also make other changes. These changes made according to the creative spirit of the present invention should be included in the scope of protection required by the present invention.
Claims
1. A control circuit for a two-wire dual-color LED lamp, characterized in that: The invention comprises a first drive circuit, a second drive circuit, a totem pole circuit and a dual-color LED lamp. The input terminal DRIVE1 of the first drive circuit and the input terminal DRIVE of the second drive circuit are respectively connected to the complementary drive signal input terminal. The output terminal of the first drive circuit and the output terminal of the second drive circuit are respectively connected to the first input terminal and the second input terminal of the totem pole circuit. The first output terminal of the totem pole circuit is connected to one end of the dual-color LED lamp, and the second output terminal of the totem pole circuit is connected to the other end of the dual-color LED lamp.
2. The control circuit of the two-wire two-color LED lamp as claimed in claim 1, characterized in that: The first driving circuit includes a transistor Q1, a resistor R1, a resistor R2, a resistor R3, and a capacitor C1. One end of the resistor R1 is connected to the input end of the first driving circuit. The other end of the resistor R1 is connected to one end of the resistor R2 and is also connected to the base of the transistor Q1. The other end of the resistor R2 is grounded. The capacitor C1 is connected in parallel with the resistor R2. The emitter of the transistor Q1 is grounded. The collector of the transistor Q1 is connected to one end of the resistor R3 and is connected to the first input end of the totem pole circuit as the output end of the first driving circuit. The other end of the resistor R3 is connected to the power supply 12. V is connected, the first drive circuit is the same as the second drive circuit, the first drive circuit includes a transistor Q6, a resistor R5, a resistor R6, a resistor R4, and a capacitor C2, the input end DRIVE of the second drive circuit is connected to one end of the resistor R5, the collector of the transistor Q6 is connected to one end of the resistor R4 and is connected to the second input end of the totem pole circuit as the output end of the second drive circuit, the output end of the second drive circuit is also connected to the input end DRIVE1 of the first drive circuit, and the other end of the resistor R4 is connected to the power supply 12V.
3. The control circuit of the two-wire two-color LED lamp as claimed in claim 1, characterized in that: The totem pole circuit includes transistors Q2, Q3, Q4, Q5, and resistor R7. The base of transistor Q2 and the base of transistor Q3 are connected together as the first input end of the totem pole circuit. The emitter of transistor Q2 and the emitter of transistor Q3 are connected together as the first output end of the totem pole circuit to directly drive the LED lamp. The collector of transistor Q2 is connected to one end of resistor R7, and the other end of resistor R7 is connected to the power supply 12V. The collector of transistor Q3 is connected to the power supply 12V. connected to ground; the base of transistor Q4 and the base of transistor Q5 are connected together as the second input end of the totem pole circuit, the emitter of transistor Q4 and the emitter of transistor Q5 are connected together as the second output end of the totem pole circuit to directly drive the LED lamp, the collector of transistor Q4 is connected to one end of resistor R7 and is also connected to the collector of transistor Q2, the collector of transistor Q5 is connected to ground, resistor R7 is a current limiting resistor, and transistor Q2 and transistor Q4 share a current limiting resistor.
4. The control circuit of the two-wire two-color LED lamp as claimed in claim 1, characterized in that: The bicolor LED lamp is formed by connecting two LED diodes of different colors in reverse polarity in parallel. One end of the bicolor LED lamp is connected to the positive pole of the DC voltage, and the other end of the bicolor LED lamp is connected to the negative pole of the DC voltage, so that one color of the LED lamp is lit. Conversely, one end of the bicolor LED lamp is connected to the negative pole of the DC voltage, and the other end of the bicolor LED lamp is connected to the positive pole of the DC voltage, so that the other color of the LED lamp is lit. The resistor R7 is used to control the current when the bicolor LED lamp is lit, and the resistance value of the resistor R7 is adjusted to change the brightness of the bicolor LED lamp.
5. The control circuit of the two-wire two-color LED lamp as claimed in claim 1, characterized in that: The control circuit of the two-wire two-color LED lamp is driven by a complementary signal, the voltages of the complementary signals are the same, and the voltage polarities are opposite. When the voltage of the complementary signal at the input end DRIVE1 of the first drive circuit is positive, and the voltage of the complementary signal at the input end DRIVE of the second drive circuit is negative, the first drive circuit outputs a low level to the first input end of the totem pole circuit, causing the transistor Q2 to be turned off, the transistor Q3 to be turned on, and the first output end of the totem pole circuit outputs a low level. At the same time, the second drive circuit outputs a high level to the second input end of the totem pole circuit, causing the transistor Q5 to be turned off, the transistor Q4 to be turned on, and the second output end of the totem pole circuit outputs a high level. The output end outputs a high level to light up an LED lamp of one color; when the voltage of the complementary signal of the input end DRIVE1 of the first drive circuit is negative and the voltage of the complementary signal of the input end DRIVE of the second drive circuit is positive, the first drive circuit outputs a high level to the first input end of the totem pole circuit, causing the transistor Q2 to be turned on, the transistor Q3 to be turned off, and the first output end of the totem pole circuit outputs a high level. At the same time, the second drive circuit outputs a low level to the second input end of the totem pole circuit, causing the transistor Q5 to be turned on, the transistor Q4 to be turned off, and the second output end of the totem pole circuit outputs a low level to light up an LED lamp of another color.