An op-amp-based automotive running light

Abstract

The present invention provides an automotive running light based on an operational amplifier, comprising: a plurality of LED lamp groups, a power input circuit, a plurality of operational amplifier circuits, and a switch circuit; the output end of the power input circuit is connected to the input end of the operational amplifier circuit and the first end of the LED lamp group; the output end of the operational amplifier circuit is connected to the input end of the switch circuit and the input end of another operational amplifier circuit; the output end of the operational amplifier circuit is connected to the second end of the LED lamp group; the operational amplifier circuit includes a charging element, and the charging time of the charging element in each operational amplifier circuit is different. When the charging element reaches the charging time, the switch circuit connected to the operational amplifier circuit is turned on, and the switch circuit drives the LED lamp group. The automotive running light of the present invention does not need to use an MCU or an IC to drive the LED lamp, has a simple structure and a low cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive lighting, and particularly relates to an automotive running light based on an operational amplifier. Background Art

[0002] Automotive lighting plays an important role in automotive driving safety. The lighting forms of traditional automotive lighting lamps are single in function and not very aesthetic. In recent years, in order to meet the market's pursuit of individuality for automotive lighting lamps and better help pedestrians and following vehicles obtain information about the movement of the vehicle, some high-end automotive manufacturers have been committed to developing dynamic running lights.

[0003] In the prior art, the commonly used lighting methods for automotive running lights are mainly divided into the following two types: One is achieved by programming the MCU to control constant current ICs with different functions. The advantage of this technology is high control precision, but the disadvantages are high cost, complex MCU peripheral circuits, and easy occurrence of problems such as failed program burning. The other is realized by pure hardware such as 555 timers, shift registers, and ICs. The advantage of this technology is to avoid software burning and lower cost, but the disadvantages are that the precision is greatly affected by temperature, the flowing intervals of each LED group cannot be adjusted individually, and the peripheral circuits are complex. The common shortcoming of these two methods is that the IO ports of the MCU or IC are limited, and the number of LED lamp groups that can be driven is limited. Summary of the Invention

[0004] In order to overcome the above technical defects, the present invention provides an automotive running light based on an operational amplifier, which does not require using an MCU or IC to drive the LED lamps, has a simple structure, and low cost.

[0005] To solve the above problems, the present invention is implemented according to the following technical solutions:

[0006] An automotive running light based on an operational amplifier includes: a plurality of LED lamp groups, a power input circuit, a plurality of operational amplifier circuits, and a switching circuit;

[0007] The output end of the power input circuit is connected to the input end of the operational amplifier circuit and the first end of the LED lamp group;

[0008] The output end of the operational amplifier circuit is connected to the input end of the switching circuit and the input end of another operational amplifier circuit;

[0009] The output end of the operational amplifier circuit is connected to the second end of the LED lamp group;

[0010] The operational amplifier circuit includes a charging element, and the charging time of the charging element in each operational amplifier circuit is different. When the charging element reaches the charging time, the switching circuit connected to the operational amplifier circuit conducts, and the switching circuit drives the LED lamp group.

[0011] As a further improvement of the present invention, the present invention further includes: a filtering and reverse protection circuit, the input end of the filtering and reverse protection circuit is connected to the output end of the power input circuit, and the output end of the filtering and reverse protection circuit is connected to the input end of the operational amplifier circuit and the first end of the LED lamp group.

[0012] As a further improvement of the present invention, the filtering and reverse protection circuit includes: a first capacitor, a second capacitor, a third capacitor, a first resistor, a bidirectional transient suppression diode, and a diode;

[0013] The output end of the power input circuit is grounded through the first capacitor and the second capacitor, the output end of the power input circuit is grounded through the first resistor, the output end of the power input circuit is grounded through the bidirectional transient suppression diode, the output end of the power input circuit is grounded through the forward-conducting diode and the third capacitor, and the cathode of the diode is connected to the input end of the operational amplifier circuit and the first end of the LED lamp group.

[0014] As a further improvement of the present invention, the present invention further includes: a voltage stabilizing circuit, the input end of the voltage stabilizing circuit is connected to the output end of the filtering and reverse protection circuit, and the output end of the voltage stabilizing circuit is connected to the input end of the operational amplifier circuit.

[0015] As a further improvement of the present invention, the voltage stabilizing circuit includes: a second resistor, a voltage stabilizing diode, and a first triode;

[0016] The collector of the first triode is connected to the output end of the voltage stabilizing circuit, the collector of the first triode is connected to the base of the first triode through the second resistor, the base of the first triode is grounded through the reversely-conducting voltage stabilizing diode, and the emitter of the first triode is connected to the input end of the operational amplifier circuit.

[0017] As a further improvement of the present invention, the operational amplifier circuit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a fourth capacitor, and an operational amplifier;

[0018] The output end of the voltage stabilizing circuit is grounded through the third resistor and the fourth resistor, the output end of the voltage stabilizing circuit is grounded through the third resistor and the fourth capacitor, the output end of the voltage stabilizing circuit is grounded through the fifth resistor and the sixth resistor, the output end of the voltage stabilizing circuit is connected to the first end of the operational amplifier through the third resistor; the output end of the voltage stabilizing circuit is connected to the second end of the operational amplifier through the fifth resistor, and the output end of the voltage stabilizing circuit is connected to the third end of the operational amplifier;

[0019] The fourth terminal of the operational amplifier is grounded, and the fifth terminal of the operational amplifier is connected to the input terminal of the other operational amplifier circuit and the second terminal of the LED lamp group.

[0020] As a further improvement of the present invention, the switch circuit includes: a seventh resistor, an eighth resistor, a ninth resistor, and a second triode;

[0021] The base of the second triode is connected to the output terminal of the operational amplifier circuit through the seventh resistor, the base of the second triode is grounded through the eighth resistor, the emitter of the second triode is grounded through the ninth resistor, and the collector of the second triode is connected to the second terminal of the LED lamp group.

[0022] As a further improvement of the present invention, the LED lamp group includes a plurality of serially connected LED lamp beads, and the plurality of LED lamp beads adopt a common anode connection method.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention adopts an operational amplifier circuit. Each operational amplifier circuit includes charging elements with different charging times. When the charging elements reach their charging times, the operational amplifier circuit is connected to the switch circuit, and the switch circuit drives the LED lamp group. By using the different charging times required by different charging elements, the lighting times of different LED groups are different, thereby achieving the effect of a flowing water lamp. The LED lamp group is controlled by the operational amplifier circuit and the switch circuit. The circuit structure is simple, without the need to use an MCU or an IC for control, and does not involve MCU program burning, greatly reducing the production process and facilitating subsequent maintenance; Since an MCU or an IC is not used for control, the problem of insufficient I / O ports of the MCU or IC will not occur. When increasing the number of LED lamp groups, there is no need to consider adding an MCU, the IO expansion port of the driving IC, and the peripheral circuit. Only by adding an operational amplifier circuit and a switch circuit can it be achieved, which has stronger operability. Description of the Drawings

[0024] The following further describes in detail the specific embodiments of the present invention with reference to the drawings, where:

[0025] Figure 1 It is the circuit diagram of the automotive flowing water lamp described in Embodiment 1;

[0026] Figure 2 It is the schematic diagram of the filtering and reverse protection circuit described in Embodiment 1;

[0027] Figure 3 It is the schematic diagram of the voltage stabilizing circuit described in Embodiment 1;

[0028] Figure 4 It is the schematic diagram of the operational amplifier circuit described in Embodiment 1;

[0029] Figure 5Schematic diagram of the connection between the operational amplifier circuits described in the first embodiment;

[0030] Figure 6 Schematic diagram of the switch circuit described in the first embodiment;

[0031] Figure 7 Schematic diagram of the LED lamp group described in the first embodiment;

[0032] Figure 8 Schematic diagram of the flowing water effect of the car running lights described in the first embodiment.

[0033] Marking description: 1. LED lamp group; 2. Power input circuit; 3. Operational amplifier circuit; 4. Switch circuit; 5. Filtering and reverse protection circuit; 6. Voltage stabilizing circuit. Detailed implementation manners

[0034] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0035] First embodiment

[0036] This embodiment discloses a car running light based on an operational amplifier, including: a plurality of LED lamp groups 1, a power input circuit 2, a plurality of operational amplifier circuits 3, and a switch circuit 4; the output end of the power input circuit 2 is connected to the input end of the operational amplifier circuit 3 and the first end of the LED lamp group 1; the output end of the operational amplifier circuit 3 is connected to the input end of the switch circuit 4 and the input end of another operational amplifier circuit 3; the output end of the operational amplifier circuit 3 is connected to the second end of the LED lamp group 1; the operational amplifier circuit 3 includes a charging element, and the charging time of the charging element in each operational amplifier circuit 3 is different. When the charging element reaches the charging time, the switch circuit 4 connected to the operational amplifier circuit 3 is turned on, and the switch circuit 4 drives the LED lamp group 1.

[0037] In order to make the running light of this embodiment have better stability, a filtering and reverse protection circuit 5 is further provided in this embodiment. The input end of the filtering and reverse protection circuit 5 is connected to the output end of the power input circuit 2, and the output end of the filtering and reverse protection circuit 5 is connected to the input end of the operational amplifier circuit 3 and the first end of the LED lamp group 1.

[0038] Specifically, the filtering and reverse protection circuit 5 includes: a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a bidirectional transient voltage suppression diode TVS1, and a diode D1; the output terminal of the power input circuit 2 is grounded through the first capacitor C1 and the second capacitor C2, the output terminal of the power input circuit 2 is grounded through the first resistor R1, the output terminal of the power input circuit 2 is grounded through the bidirectional transient voltage suppression diode TVS1, the output terminal of the power input circuit 2 is grounded through the forward-conducting diode D1 and the third capacitor C3, and the cathode of the diode D1 is connected to the input terminal of the operational amplifier circuit 3 and the first terminal of the LED lamp group 1; the first capacitor C1 and the second capacitor C2 are composed of capacitors with small capacitance values, the first resistor R1 is a current-discharging resistor, the diode D1 is a reverse protection diode, and the third capacitor C3 is a capacitor with a relatively large capacitance value. Through this filtering and reverse protection circuit 5, a more stable power input can be provided for the subsequent circuit.

[0039] In addition, this embodiment further includes: a voltage stabilizing circuit 6, the input terminal of the voltage stabilizing circuit 6 is connected to the output terminal of the filtering and reverse protection circuit 5, and the output terminal of the voltage stabilizing circuit 6 is connected to the input terminal of the operational amplifier circuit 3.

[0040] Specifically, the voltage stabilizing circuit 6 includes: a second resistor R2, a voltage stabilizing diode Z1, and a first triode TR1; the collector of the first triode TR1 is connected to the output terminal of the voltage stabilizing circuit 6, the collector of the first triode TR1 is connected to the base of the first triode TR1 through the second resistor R2, the base of the first triode TR1 is grounded through the reverse-conducting voltage stabilizing diode Z1, and the emitter of the first triode TR1 is connected to the input terminal of the operational amplifier circuit 3; when power is input, the voltage stabilizing diode Z1 stabilizes the base voltage of the first triode TR1 to 5.6V. At this time, the emitter of the first triode TR1 is at a low level, so the first triode TR1 conducts, providing a stable voltage of 4.9V for the stable operation of the subsequent operational amplifier circuit 3. The voltage stabilizing circuit 6 of this embodiment can also be composed of a similar circuit structure in the prior art.

[0041] In the above embodiment, the charging element is a capacitor, and the operational amplifier circuit 3 includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4, and an operational amplifier U1; the output terminal of the voltage stabilizing circuit 6 is grounded through the third resistor R3 and the fourth resistor R4, the output terminal of the voltage stabilizing circuit 6 is grounded through the third resistor R3 and the fourth capacitor C4, the output terminal of the voltage stabilizing circuit 6 is grounded through the fifth resistor R5 and the sixth resistor R6, and the output terminal of the voltage stabilizing circuit 6 is connected to the first terminal of the operational amplifier U1 through the third resistor R3; the output terminal of the voltage stabilizing circuit 6 is connected to the second terminal of the operational amplifier U1 through the fifth resistor R6, and the output terminal of the voltage stabilizing circuit 6 is connected to the third terminal of the operational amplifier U1; the fourth terminal of the operational amplifier U1 is grounded, and the fifth terminal of the operational amplifier U1 is connected to the input terminal of another operational amplifier circuit 3 and the second terminal of the LED lamp group 1.

[0042] In the above embodiment, the switch circuit 4 includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a second triode TR2; the base of the second triode TR2 is connected to the output terminal of the operational amplifier circuit 3 through the seventh resistor R7, the base of the second triode TR2 is grounded through the eighth resistor R8, the emitter of the second triode TR2 is grounded through the ninth resistor R9, and the collector of the second triode TR2 is connected to the second end of the LED lamp group 1.

[0043] In this embodiment, four groups of operational amplifier circuits 3 and four groups of switch circuits 4 are adopted. The components in the four groups of operational amplifier circuits 3 and the four groups of switch circuits 4 are the same, but the parameters between the components are not necessarily the same. Although the same names and labels are used to describe each operational amplifier circuit 3 in this embodiment, it should be noted that only the types of the components themselves are described in this embodiment.

[0044] Preferably, the LED lamp group 1 includes a plurality of serially connected LED lamp beads, and the plurality of LED lamp beads are connected in a common anode configuration. It should be noted that in this embodiment, the plurality of LED lamp beads can also be connected in a series-parallel form, or the LED lamp group 1 can be connected in a series-parallel manner.

[0045] Next, the present embodiment will be further explained in combination with the specific implementation principle:

[0046] According to the requirements of the actual running light time, in the first operational amplifier circuit 3, the resistance values of the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the capacitance value of the fourth capacitor C4 are adjusted so that during normal operation, the voltage at the first terminal of the operational amplifier U1 is always higher than that at the second terminal, and when the charge and discharge of the fourth capacitor C4 reaches the set stable voltage, a high level is output at the fifth terminal of the operational amplifier U1. The base voltage of the second triode TR2 is higher than the emitter voltage, and the second diode TR2 conducts. Since the collector of the second triode TR2 is connected to the cathode of the LED lamp group 1, when the second triode TR2 conducts, the first group of LED lamp groups 1 is grounded through the eighth resistor R8, and the first group of LED lamp groups 1 is lit. Similarly, the resistance values of the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, and the capacitance value of the fourth capacitor C4 in the other three operational amplifier circuits 3 can also be adjusted to control the sequential lighting time of the second group of LED lamp groups 1, and the effect is as Figure 7 shown.

[0047] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Therefore, any modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An op-amp based automotive running light, characterized in that, Comprising: A plurality of LED lamp groups, a power input circuit, a plurality of operational amplifier circuits, a switching circuit, and a filtering and reverse protection circuit; The output end of the power input circuit is connected to the input end of the operational amplifier circuit and the first end of the LED lamp group; The output end of the operational amplifier circuit is connected to the input end of the switching circuit and the input end of another operational amplifier circuit; The output end of the operational amplifier circuit is connected to the second end of the LED lamp group; The operational amplifier circuit includes a charging element, and the charging time of the charging element in each operational amplifier circuit is different. When the charging element reaches the charging time, the switching circuit connected to the operational amplifier circuit is turned on, and the switching circuit drives the LED lamp group; The input end of the filtering and reverse protection circuit is connected to the output end of the power input circuit, and the output end of the filtering and reverse protection circuit is connected to the input end of the operational amplifier circuit and the first end of the LED lamp group; The filtering and reverse protection circuit includes: a first capacitor, a second capacitor, a third capacitor, a first resistor, a bidirectional transient voltage suppression diode, and a diode; The output end of the power input circuit is grounded through the first capacitor and the second capacitor, the output end of the power input circuit is grounded through the first resistor, the output end of the power input circuit is grounded through the bidirectional transient voltage suppression diode, the output end of the power input circuit is grounded through a forward-conducting diode and the third capacitor, and the cathode of the diode is connected to the input end of the operational amplifier circuit and the first end of the LED lamp group.

2. The automotive running lights according to claim 1, characterized in that, Further comprising: A voltage stabilizing circuit, the input end of the voltage stabilizing circuit is connected to the output end of the filtering and reverse protection circuit, and the output end of the voltage stabilizing circuit is connected to the input end of the operational amplifier circuit.

3. The automotive running lights according to claim 2, characterized in that, The voltage stabilizing circuit includes: a second resistor, a voltage stabilizing diode, and a first triode; The collector of the first triode is connected to the output end of the voltage stabilizing circuit, the collector of the first triode is connected to the base of the first triode through the second resistor, the base of the first triode is grounded through the reversely-conducting voltage stabilizing diode, and the emitter of the first triode is connected to the input end of the operational amplifier circuit.

4. The car running lights according to claim 2, characterized in that, The charging element is a capacitor, and the operational amplifier circuit includes: a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a fourth capacitor, and an operational amplifier; The output end of the voltage stabilizing circuit is grounded through the third resistor and the fourth resistor, the output end of the voltage stabilizing circuit is grounded through the third resistor and the fourth capacitor, the output end of the voltage stabilizing circuit is grounded through the fifth resistor and the sixth resistor, the output end of the voltage stabilizing circuit is connected to the first end of the operational amplifier through the third resistor; the output end of the voltage stabilizing circuit is connected to the second end of the operational amplifier through the fifth resistor, and the output end of the voltage stabilizing circuit is connected to the third end of the operational amplifier; The fourth end of the operational amplifier is grounded, and the fifth end of the operational amplifier is connected to the input end of another operational amplifier circuit and the second end of the LED lamp group.

5. The automotive running lights according to claim 1, characterized in that, The switching circuit includes: a seventh resistor, an eighth resistor, a ninth resistor, and a second triode; The base of the second triode is connected to the output terminal of the operational amplifier circuit through the seventh resistor, the base of the second triode is grounded through the eighth resistor, the emitter of the second triode is grounded through the ninth resistor, and the collector of the second triode is connected to the second end of the LED lamp group.

6. The automotive running lights according to claim 1, characterized in that, The LED lamp group includes a plurality of serially connected LED lamp beads, and the plurality of LED lamp beads are connected in a common anode configuration.

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