A side turn signal and side marker lamp common light source control circuit

Abstract

The application discloses a same-light-source control circuit for a side turn signal lamp and a side marker lamp, which comprises a side marker lamp signal input end and a turn signal lamp signal input end. The side marker lamp signal input end is divided into two paths, one of which is connected with a light emitting diode, and the light emitting diode is respectively connected with the collector of a first triode and the collector of a second triode, the emitter of the first triode and the emitter of the second triode are grounded, and the other path is connected with the base of the first triode and the collector of a third triode after being connected with a first resistor, and the emitter of the third triode is grounded. The turn signal lamp signal input end is divided into three paths, one of which is connected with a light emitting diode, the second path is connected with the base of the second triode after being connected with a second resistor, and the third path is connected with a first diode and a second resistor, the second resistor is respectively connected with a third resistor and a first capacitor, the first capacitor is grounded, and the third resistor is connected with the base of the third triode. When the side turn signal lamp and the side marker lamp share the same light source, the side turn signal lamp is preferentially driven.

Description

Technical Field

[0001] This invention belongs to the technical field of turn signal control circuits, specifically a control circuit for side turn signals and side marker lights using the same light source. Background Technology

[0002] In current automotive designs, side turn signals and side marker lights often use the same light source. When the side marker lights are on while the vehicle is in motion, the turn signals need to take priority if activated, thus requiring control. In existing technology, when side turn signals and side marker lights use the same light source, the drive scheme that prioritizes side turn signal operation requires an ECU (Electronic Control Unit), which results in high operating costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a control circuit for side turn signals and side marker lights to share the same light source. This control circuit enables priority driving of the side turn signals when they share the same light source, and it is also inexpensive.

[0004] To solve the above-mentioned technical problems, the present invention provides a control circuit for side turn signals and side marker lights sharing the same light source. The circuit includes a side marker light signal input terminal and a turn signal input terminal. The side marker light signal input terminal is divided into two paths: one path connects to a light-emitting diode (LED), which is connected to the collector of a first transistor and the collector of a second transistor. The emitters of both the first and second transistors are grounded. The second path connects to a first resistor and then to the base of the first transistor and the collector of a third transistor, respectively. The emitter of the third transistor is grounded. The turn signal input terminal is divided into three paths: one path connects to the LED; the second path connects to a second resistor and then to the base of the second transistor; the third path connects to a first LED and then to a third resistor. The third resistor connects to a fourth resistor and a first capacitor, which is grounded. The fourth resistor connects to the base of the third transistor. This control circuit enables priority driving of the side turn signals when they share the same light source, and it is cost-effective.

[0005] In the above technical solution, preferably, the side sign light signal input terminal is connected in parallel with a first surge filter circuit, the first surge filter circuit including a first diode and a fifth resistor connected in series, and the first diode is grounded.

[0006] In the above technical solution, preferably, the turn signal input terminal is connected in parallel with a second surge filter circuit, the second surge filter circuit includes a second diode and a sixth resistor connected in series, and the second diode is grounded.

[0007] In the above technical solution, preferably, each of the side marker light signal input terminal and the turn signal input terminal is connected to a reverse connection protection diode.

[0008] Compared with the prior art, the present invention has the following advantages: when the side turn signal and the side marker light have the same light source, this control circuit can achieve priority driving of the side turn signal, and the cost is low. Attached Figure Description

[0009] Figure 1 This is a circuit connection diagram of an embodiment of the present invention. Implementation

[0010] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: See below Figure 1 A control circuit for side turn signals and side marker lights using the same light source includes a side marker light signal input terminal and a turn signal input terminal. A first surge filter circuit is connected in parallel to the side marker light signal input terminal. The first surge filter circuit includes a first TVS diode (TVS1) and a fifth resistor (R1) connected in series. The first TVS diode (TVS1) is grounded, and then the circuit splits into two paths. One path connects to a light-emitting diode (LED) D, which is connected to the collector of a first transistor (Q2) and the collector of a second transistor (Q1). The emitters of both transistors (Q2 and Q1) are grounded. The two paths are connected to a first resistor (R10) and then to the base of the first transistor (Q2). The collector of the third transistor Q3 is connected to the ground, and the emitter of the third transistor Q3 is grounded. A second surge filter circuit is connected in parallel to the turn signal input terminal. The second surge filter circuit includes a second TVS diode TVS2 connected in series and a sixth resistor R2. The second TVS diode TVS2 is grounded and then divided into three paths. One path is connected to the light-emitting diode D. The second path is connected to the base of the second transistor Q1 after the second resistor R12. The third path is connected to the first diode D5 and then to the third resistor R8. The third resistor R8 is connected to the fourth resistor R9 and the first capacitor C2. The first capacitor C2 is grounded, and the fourth resistor R9 is connected to the base of the third transistor Q3.

[0011] To prevent reverse connection of the circuit, each of the side marker light signal input terminal and the turn signal input terminal is connected to a reverse connection protection diode D1, D2, D3, D4.

[0012] The turn signal priority principle of this side turn signal and side marker light control circuit is as follows: when the side marker light signal arrives, the side marker light power supply first passes through the first surge filter circuit, which filters out surge voltages higher than 40V. Then, one path passes through the reverse connection protection diode D1 to supply power to the light-emitting diode D, i.e., the light source, and the other path passes through the reverse connection protection diode D4. The first resistor R10 provides the control conduction voltage to the first transistor Q2, which is used to control the side marker light to turn on and off. When the turn signal is received, the turn signal power supply first passes through the second surge filter circuit, which filters out surge voltages higher than 40V. This voltage is then output in three paths: one path powers the LED (light source) through the reverse polarity protection diode D2; another path powers the LED (light source) through the reverse polarity protection diode D3 and the second resistor R12, providing the control voltage for the second transistor Q1 to control the turn signal; the third path powers the first capacitor C2 through the first diode D5 and the third resistor R8, simultaneously providing the conduction voltage for the third transistor Q3 through the fourth resistor R9. When the third transistor Q3 is on, its collector is at a low level. Since the collector of the third transistor Q3 is connected to the base of the first transistor Q2, the base of the first transistor Q2 is also at a low level, so the first transistor Q2 is off. When the turn signal is off, because the first capacitor C2 is charging, its discharge path is limited to the fourth resistor R9, the third transistor Q3, and the first diode D5 to prevent reverse discharge. In other words, the first capacitor C2 continues to provide the conduction voltage for the third transistor Q3, and the third transistor Q3 is conducting. The first transistor Q2 remains off. Because the turn signal is temporarily disconnected, the second transistor Q1 is still off at this time. Both the first transistor Q2 and the second transistor Q1 are in the off state. Even when the side marker light signal is received, the light source is not lit. The conduction time of the third transistor Q3 depends on the capacitance of the first capacitor C2 and the resistance value of the fourth resistor R9. Thus, the effect of flashing turn signals is achieved regardless of whether the side marker light signal is present. When the turn signal is received, the turn signal working mode is repeated to realize the turn signal priority function.

[0013] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A control circuit for side turn signals and side marker lights using the same light source, characterized in that: The side marker lamp signal input end and the turn signal input end are included, the side marker lamp signal input end is divided into two ways, one way is connected with a light emitting diode (D), the light emitting diode (D) is connected with the collector of a first triode (Q2) and the collector of a second triode (Q1) respectively, the emitter of the first triode (Q2) and the second triode (Q1) is grounded, the second way is connected with a first resistor (R10) and then connected with the base of the first triode (Q2) and the collector of a third triode (Q3) respectively, the emitter of the third triode (Q3) is grounded; the turn signal input end is divided into three ways, one way is connected with the light emitting diode (D), the second way is connected with a second resistor (R12) and then connected with the base of the second triode (Q1), the third way is connected with a first diode (D5) and then connected with a third resistor (R8), the third resistor (R8) is connected with a fourth resistor (R9) and a first capacitor (C2) respectively, the first capacitor (C2) is grounded, the fourth resistor (R9) is connected with the base of the third triode (Q3).

2. A side turn and side marker lamp common light source control circuit as claimed in claim 1, wherein: The side marker lamp signal input end is connected with a first surge filter circuit in parallel, the first surge filter circuit includes a first TVS diode (TVS1) and a fifth resistor (R1) in series, the first TVS diode (TVS1) is grounded.

3. The control circuit for side turn signals and side marker lights sharing the same light source as described in claim 1, characterized in that: The turn signal input end is connected with a second surge filter circuit in parallel, the second surge filter circuit includes a second TVS diode (TVS2) and a sixth resistor (R2) in series, the second TVS diode (TVS2) is grounded.

4. The control circuit for side turn signals and side marker lights sharing the same light source as described in claim 1, characterized in that: Each way of the side marker lamp signal input end and the turn signal input end is connected with an anti-reverse diode (D1, D2, D3, D4).

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