A vehicle indicator light control circuit and vehicle

Abstract

This invention discloses a vehicle indicator light control circuit and a vehicle, relating to the field of automotive electronic control technology. It includes a dimming signal processing module, a first controllable switch, a second controllable switch, and an indicator light circuit. Utilizing hardware connections, the ignition signal serves as the primary enable signal, and the status signal has higher priority than the dimming signal. Therefore, when the status signal is invalid, brightness can be adjusted via the dimming signal; when the status signal is valid, the dimming signal is forcibly invalidated, and the indicator light maintains its maximum brightness. Regardless of the combination or change of the ignition, dimming, and status signals, stable switching between dimming mode, full brightness mode, and off mode can always be achieved without an additional logic judgment module. This simplifies the circuit structure, reduces hardware costs, and improves the system's response speed.

Description

Technical Field

[0001] This invention relates to the field of automotive electronic control technology, and in particular to a vehicle indicator light control circuit and a vehicle. Background Technology

[0002] As vehicles become increasingly electronic, in-vehicle indicator lights often need to be compatible with various operating conditions. For example, when the headlights are on at night, the indicator lights need to enter a dimming mode that dims in sync with the instrument panel to ensure driving safety. However, when a specific system condition is triggered or a malfunction occurs, they need to switch to a forced full-brightness mode to provide a prominent status warning.

[0003] However, existing control circuits typically use pulse width modulation (PWM) signals to adjust the brightness of indicator lights, while controlling the indicator light mode switching via status signals. Such solutions are mostly single signal paths, where PWM signals, status signals, and ignition signals are directly superimposed or simply share the same control line. This makes it easy for level competition to occur when multiple inputs such as ignition, lighting, and status signals are superimposed, leading to unstable logic judgment results. For example, when switching to the forced full-brightness mode, the dimming signal cannot be completely shielded, causing the indicator light to still have a faint, visible flicker and brightness fluctuation, making it difficult to achieve stable and clean logic switching. Summary of the Invention

[0004] The purpose of this invention is to provide a vehicle indicator light control circuit and a vehicle, which solves the problem of unstable logic judgment results in existing indicator light control circuits when there are complex multiple inputs such as ignition, lighting and status signals superimposed.

[0005] To solve the above-mentioned technical problems, the present invention provides a vehicle indicator light control circuit, comprising: Dimming signal processing module, first controllable switch, second controllable switch, indicator light circuit; The dimming signal processing module has its first input terminal connected to the positive terminal of the lighting, its second input terminal connected to the negative terminal of the lighting, and its output terminal connected to the control terminal of the first controllable switch and the first terminal of the second controllable switch. The output terminal of the dimming signal processing module is used to output a dimming signal according to the level states of the positive and negative terminals of the lighting to control the first controllable switch to alternately turn on and off. The first terminal of the first controllable switch is connected to the control terminal of the ignition signal line and the indicator light circuit, and the second terminal of the first controllable switch is grounded. The control terminal of the second controllable switch is connected to a status signal, and the second terminal of the second controllable switch is grounded; The indicator light circuit is used to enter a lit state when an ignition signal is received.

[0006] Optionally, the dimming signal processing module includes: A first diode, a first resistor, and a second diode; The anode of the first diode is connected to the positive terminal of the lighting circuit, and the cathode of the first diode is connected to the first terminal of the first resistor. The second terminal of the first resistor is connected to the anode of the second diode and the control terminal of the first controllable switch. The cathode of the second diode is connected to the negative terminal of the lighting circuit.

[0007] Optionally, the indicator light circuit includes: Third controllable switch, output buffer module, light-emitting module; The control terminal of the third controllable switch serves as the control terminal of the indicator light circuit. The first terminal of the third controllable switch is connected to the ignition signal line, and the second terminal of the third controllable switch is connected to the input terminal of the output buffer module. The output terminal of the output buffer module is connected to the input terminal of the light-emitting module, and the output terminal of the light-emitting module is connected to the next-level circuit or ground.

[0008] Optionally, a transient voltage clamping module may also be included; the first end of the transient voltage clamping module is connected to the ignition signal line, and the second end of the transient voltage clamping module is grounded.

[0009] Optionally, a filtering module may also be included; the first end of the filtering module is connected to the ignition signal line, and the second end of the filtering module is grounded.

[0010] Optional, also includes: First anti-backflow isolation module and second anti-backflow isolation module; The first anti-backflow isolation module is connected in series on the ignition signal line to unidirectionally isolate the ignition signal and suppress reverse leakage current. The first end of the second anti-backflow isolation module is connected to the status signal, and the second end of the second anti-backflow isolation module is connected to the control terminal of the second controllable switch, which is used to unidirectionally isolate the status signal and suppress reverse leakage current.

[0011] Optionally, the output buffer module includes: The second and third resistors; The first end of the second resistor is connected to the first end of the third resistor and serves as the input end of the output buffer module; the second end of the second resistor is connected to the second end of the third resistor and serves as the output end of the output buffer module.

[0012] Optionally, the light-emitting module includes: Capacitor, LED, and fourth resistor; The first end of the capacitor is connected to the first end of the light-emitting diode and the first end of the fourth resistor, and serves as the input end of the light-emitting module; the second end of the capacitor is connected to the second end of the light-emitting diode and the second end of the fourth resistor, and serves as the output end of the light-emitting module.

[0013] Optionally, a bias resistor may also be included; the bias resistor is connected in series on the ignition signal line.

[0014] To solve the above-mentioned technical problems, the present invention also provides a vehicle including the above-mentioned vehicle indicator light control circuit.

[0015] This invention provides a vehicle indicator light control circuit, including a dimming signal processing module, a first controllable switch, a second controllable switch, and an indicator light circuit. When the ignition signal is invalid, the indicator light circuit loses its driving signal, stops working, and the indicator light goes out. When the ignition signal is valid and the status signal is invalid, the second controllable switch is turned off. The potential of the control terminal of the first controllable switch is determined by the dimming signal output by the dimming signal processing module, thereby driving the first controllable switch to alternately turn on and off. When on, the control terminal of the indicator light circuit is pulled low, and the indicator light goes out. When off, the ignition signal is transmitted to the control terminal of the indicator light circuit, and the indicator light illuminates, thus realizing that the brightness changes with the dimming signal. When the status signal is valid, the second controllable switch is turned on, forcibly pulling low the control terminal of the first controllable switch, so that the dimming signal no longer works. Then the first controllable switch is turned off, the ignition signal is continuously transmitted to the indicator light circuit, and the indicator light maintains its maximum brightness. No additional logic judgment circuit is required. The status signal has a higher priority than the dimming signal simply through hardware connection. At the same time, the ignition signal serves as the overall enable signal. No matter how the ignition, dimming, and status signals are combined and changed, a stable switching between dimming, full brightness mode and off mode can always be achieved. Moreover, the circuit structure is simple, which reduces hardware costs and improves the system response speed.

[0016] Furthermore, the same effect applies to the vehicle provided by this invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a vehicle indicator light control circuit provided by the present invention. Detailed Implementation

[0019] The core of this invention is to provide a vehicle indicator light control circuit and a vehicle.

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] As vehicles become increasingly electronic, in-vehicle indicator lights often need to be compatible with various operating conditions. For example, when the headlights are on at night, the indicator lights need to enter a dimming mode that dims in sync with the instrument panel to ensure driving safety. However, when a specific system condition is triggered or a malfunction occurs, they need to switch to a forced full-brightness mode to provide a prominent status warning.

[0022] However, existing control circuits typically use pulse width modulation (PWM) signals to adjust the brightness of indicator lights, while controlling the indicator light mode switching via status signals. Such solutions are mostly single signal paths, where PWM signals, status signals, and ignition signals are directly superimposed or simply share the same control line. This makes it easy for level competition to occur when multiple inputs such as ignition, lighting, and status signals are superimposed, leading to unstable logic judgment results. For example, when switching to the forced full-brightness mode, the dimming signal cannot be completely shielded, causing the indicator light to still have a faint, visible flicker and brightness fluctuation, making it difficult to achieve stable and clean logic switching.

[0023] To address the aforementioned technical problems, this invention provides a vehicle indicator light control circuit.

[0024] For details, please see Figure 1 , Figure 1 This is a schematic diagram of a vehicle indicator light control circuit provided by the present invention.

[0025] like Figure 1 As shown, the vehicle indicator light control circuit includes: Dimming signal processing module 1, first controllable switch T1, second controllable switch T2, indicator light circuit 2; The first input terminal of the dimming signal processing module 1 is connected to the positive terminal ILL+ of the lighting, the second input terminal of the dimming signal processing module 1 is connected to the negative terminal ILL- of the lighting, and the output terminal of the dimming signal processing module 1 is connected to the control terminal of the first controllable switch T1 and the first terminal of the second controllable switch T2. It is used to output a dimming signal according to the level state of the positive terminal ILL+ and the negative terminal ILL- of the lighting to control the first controllable switch T1 to alternately turn on and off. The first terminal of the first controllable switch T1 is connected to the control terminal of the ignition signal line and indicator light circuit 2, and the second terminal of the first controllable switch T1 is grounded. The control terminal of the second controllable switch T2 is connected to the status signal DETENT, and the second terminal of the second controllable switch T2 is grounded. Indicator circuit 2 is used to enter the illuminated state when the ignition signal IGNTION is received.

[0026] Specifically, the first and second input terminals of the dimming signal processing module 1 are connected to the positive lighting terminal ILL+ and the negative lighting terminal ILL-, respectively, to receive the current brightness adjustment signal of the lighting system, i.e., the level change of the negative lighting terminal ILL- relative to the positive lighting terminal ILL+, and output a dimming signal to the control terminal of the first controllable switch T1 as the driving basis for the on / off state of the first controllable switch T1. The dimming signal can be a pulse width modulation signal. The first terminal of the first controllable switch T1 is connected to both the ignition signal line and the control terminal of the indicator light circuit 2, and the second terminal of the first controllable switch T1 is grounded. Thus, the on / off state of the first controllable switch T1 directly determines whether the ignition signal IGNTION can be transmitted to the control terminal of the indicator light circuit 2. The control terminal of the second controllable switch T2 is connected to the status signal DETENT, and the second terminal of the second controllable switch T2 is grounded. When the status signal DETENT is valid, it forces the control terminal of the first controllable switch T1 to a low potential to ground, thereby invalidating the dimming signal. The indicator light circuit 2 is used to enter the lighting state when it receives the ignition signal IGNTION at its control terminal; otherwise, it remains off. It should be noted that the positive terminal ILL+ and the negative terminal ILL- of the lighting system are common signal lines of the vehicle body lighting system. In addition to being connected to the dimming signal processing module 1 of this invention, they are usually also connected to multiple other load circuits such as switch indicator lights and instrument backlights in the vehicle, so as to uniformly control these lights to dim synchronously when the headlights are turned on. In this embodiment, the dimming signal processing module 1 is only connected as one of the loads.

[0027] Specifically, when the ignition signal IGNTION is invalid, the control terminal of indicator light circuit 2 cannot be effectively driven, and indicator light circuit 2 remains off. When the ignition signal IGNTION is valid and the status signal DETENT is invalid, the second controllable switch T2 remains off and does not affect the control terminal of the first controllable switch T1. At this time, the potential of the control terminal of the first controllable switch T1 is determined entirely by the dimming signal processing module 1 based on the level states of the lighting positive terminal ILL+ and the lighting negative terminal ILL-, driving the first controllable switch T1 to alternately turn on and off. When the first controllable switch T1 is on, the control terminal of indicator light circuit 2 is pulled low to ground, and indicator light circuit 2 is off; when the first controllable switch T1 is off, the ignition signal IGNTION is transmitted to the control terminal of indicator light circuit 2, and indicator light circuit 2 is on. This alternating change makes indicator light circuit 2 exhibit a dimming effect that changes synchronously with the duty cycle of the dimming signal. When the status signal DETENT is valid, the second controllable switch T2 is turned on, forcibly pulling down and locking the control terminal of the first controllable switch T1 to ground potential. At this time, although the dimming signal processing module 1 is still outputting a dimming signal normally, because the control terminal of the first controllable switch T1 remains at a low potential, the dimming signal can no longer change the on / off state of the first controllable switch T1. That is, the output of the dimming signal processing module 1 is effectively shielded by the first controllable switch T1, while the positive lighting terminal ILL+ and the negative lighting terminal ILL- continue to operate normally and provide dimming signals to other lights on the vehicle body, unaffected. Since the first controllable switch T1 remains off, the ignition signal IGNTION continues to be transmitted to the control terminal of the indicator light circuit 2, keeping the indicator light circuit 2 on and achieving a forced full-brightness state unaffected by the dimming signal. Because the locking action of the status signal DETENT on the control terminal of the first controllable switch T1 takes precedence over the driving action of the dimming signal, the switching process between the dimming mode and the full-brightness mode is clear, and the indicator light circuit 2 switches stably without flickering or jittering.

[0028] Specifically, the dimming signal processing module 1 can be composed of a first diode D1, a first resistor R1, and a second diode D2: the anode of the first diode D1 is connected to the positive terminal ILL+ of the lighting circuit; the cathode of the first diode D1 is connected via the first resistor R1 to the control terminal of the first controllable switch T1, the first terminal of the second controllable switch T2, and the anode of the second diode D2; the cathode of the second diode D2 is connected to the negative terminal ILL- of the lighting circuit. The first diode D1 prevents backflow of current from other branches into the positive terminal ILL+ of the lighting circuit; the first resistor R1 limits current and shapes the node level; and the second diode D2 clamps the node potential within a safe range when negative voltage disturbances or abnormal spikes occur at the negative terminal ILL- of the lighting circuit, preventing the first controllable switch T1 from being falsely triggered. The first controllable switch T1 can be a transistor, with a base resistor R5 connected in series with its base, and a pull-down resistor R6 connected in parallel between its base and emitter. The second controllable switch can be implemented using a composite transistor.

[0029] As can be seen, this embodiment does not require additional logic judgment circuits. It only uses hardware connection to make the priority of the status signal DETENT higher than the dimming signal. At the same time, the ignition signal IGNTION serves as the overall enable signal. No matter how the ignition, dimming, and status signals are combined and changed, it can always achieve stable switching between dimming, full brightness mode and off mode.

[0030] As an optional embodiment, the dimming signal processing module 1 includes: First diode D1, first resistor R1, and second diode D2; The anode of the first diode D1 is connected to the positive terminal ILL+ of the lighting circuit, and the cathode of the first diode D1 is connected to the first terminal of the first resistor R1. The second terminal of the first resistor R1 is connected to the anode of the second diode D2 and the control terminal of the first controllable switch T1. The cathode of the second diode D2 is connected to the negative terminal ILL- of the lighting circuit.

[0031] Specifically, the first diode D1 is connected in series between the positive lighting terminal ILL+ and the first resistor R1 to limit the unidirectional conduction of this branch, preventing the current from the control terminal of the first controllable switch T1 from flowing backwards into the common lighting signal line where the positive lighting terminal ILL+ is located, thus avoiding affecting the normal operation of other vehicle body lights connected to the same positive lighting terminal ILL+ and negative lighting terminal ILL-. The first resistor R1 is used to limit the current of the signal conducted through the first diode D1 and to shape the level of this node, providing a suitable drive current and potential for the control terminal of the first controllable switch T1. The second diode D2 is connected between this node and the negative lighting terminal ILL-, providing a clamping path when negative voltage disturbances or abnormal voltage spikes occur at the negative lighting terminal ILL-, limiting the potential of this node within a safe range, and preventing the control terminal of the first controllable switch T1 from being falsely triggered or damaged due to abnormal voltage at the negative lighting terminal ILL-.

[0032] Specifically, during normal dimming, the positive terminal ILL+ of the lighting circuit has a constant positive voltage, while the negative terminal ILL- outputs a pulse width modulation signal. This means that the negative terminal ILL- exhibits a periodic high-low level change relative to the positive terminal ILL+. When the negative terminal ILL- is low, current flows through the first diode D1, the first resistor R1, and the second diode D2, forming a path and pulling down the potential of the control terminal of the first controllable switch T1. When the negative terminal ILL- is high, the potential of the control terminal of the first controllable switch T1 is pulled up from the positive terminal ILL+ through the first diode D1 and the first resistor R1, maintaining it at a higher level. The first controllable switch T1 alternately turns on and off, thus achieving a dimming effect where the brightness of the indicator light circuit 2 changes synchronously with the high-low level transition rhythm of the negative terminal ILL-.

[0033] As can be seen, this embodiment achieves dimming signal output and node protection by setting a first diode D1, a first resistor R1 and a second diode D2. The structure is simple and the cost is low.

[0034] As an optional embodiment, the indicator circuit 2 includes: Third controllable switch T3, output buffer module, light-emitting module; The control terminal of the third controllable switch T3 serves as the control terminal of the indicator light circuit 2. The first terminal of the third controllable switch T3 is connected to the ignition signal line, and the second terminal of the third controllable switch T3 is connected to the input terminal of the output buffer module. The output terminal of the output buffer module is connected to the input terminal of the light-emitting module. The output terminal INDICATOR OUT of the light-emitting module is connected to the next-level circuit or ground.

[0035] Specifically, the third controllable switch T3 is a power switch within the indicator light circuit 2 specifically used to drive the light-emitting module. Its on / off state directly determines whether the light-emitting module can obtain driving current. By adding the third controllable switch T3 between the first controllable switch T1 and the light-emitting module, even if there is a weak leakage current when the first controllable switch T1 is off, this leakage current is blocked by the third controllable switch T3, effectively preventing the leakage current from directly flowing through the light-emitting module and causing the indicator light circuit 2 to mis-turn on or produce weak light leakage. In addition, even if there are abnormalities such as short circuits or overcurrents in the light-emitting module branch, they are mainly borne by the third controllable switch T3 and will not directly affect the first controllable switch T1 and its dimming signal processing module 1 and the DETENT status signal judgment part, thus achieving mutual isolation between the logic judgment part and the power drive part. The output buffer module is set between the third controllable switch T3 and the light-emitting module to share and limit the driving current, and to buffer and shape the level of the branch where the light-emitting module is located, reducing the impact on the light-emitting module caused by the instantaneous switching of the third controllable switch T3.

[0036] Specifically, when the first controllable switch T1 is off and the ignition signal IGNTION is transmitted to the control terminal of the third controllable switch T3, the third controllable switch T3 is turned on, and the current is conducted through the third controllable switch T3 and the output buffer module to the light-emitting module, which lights up. When the first controllable switch T1 is on and the control terminal of the indicator light circuit 2 is pulled low to ground, the control terminal of the third controllable switch T3 loses its effective driving potential and is turned off, the light-emitting module branch is disconnected, and the light-emitting module is turned off. The third controllable switch T3 switches synchronously with the on and off states of the first controllable switch T1, thereby converting the dimming or full-brightness logic reflected by the first controllable switch T1 into the actual on / off state and brightness performance of the light-emitting module.

[0037] As can be seen, this embodiment isolates the power drive from the logic judgment by setting a third controllable switch T3, and the output buffer module limits and buffers the drive current to reduce the impact on the light-emitting module at the moment of switching on and off, thereby improving the stability of the indicator light output.

[0038] As an optional embodiment, it also includes a transient voltage clamping module; the first end of the transient voltage clamping module is connected to the ignition signal line, and the second end of the transient voltage clamping module is grounded.

[0039] Specifically, in the vehicle's onboard power supply environment where the ignition signal line is located, transient voltage spikes with high amplitude and extremely short duration are prone to appear on the ignition signal line during scenarios such as ignition, relay operation, and load switching. If these spikes are not controlled, they may be directly conducted to the control terminals of the first controllable switch T1 and the indicator light circuit 2 in the subsequent stages, causing false triggering or even damage to the devices. Therefore, a transient voltage clamping module is needed to specifically suppress transient surges on the ignition signal line, ensuring that the voltage received by the subsequent circuits remains within a safe range.

[0040] During operation, when the ignition signal line voltage is within the normal range, the transient voltage clamping module is in a high-impedance state, does not conduct, and does not affect the normal conduction of the ignition signal IGNTION. When a transient voltage spike appears on the ignition signal line, the transient voltage clamping module quickly conducts, channeling the spike energy to ground for discharge, thus clamping the voltage on the ignition signal line within a safe range. After the spike disappears, the transient voltage clamping module automatically returns to the high-impedance state, without affecting the normal operation of the circuit. In practical applications, this transient voltage clamping module can use a transient voltage suppression diode D6, utilizing its characteristics of high current discharge and fast response speed under reverse breakdown state to achieve rapid clamping protection against transient surges in the ignition signal line.

[0041] As can be seen, this embodiment improves the circuit's surge protection and operational reliability in complex vehicle power supply environments by setting a transient voltage clamping module.

[0042] As an optional embodiment, a filtering module is also included; the first end of the filtering module is connected to the ignition signal line, and the second end of the filtering module is grounded.

[0043] Specifically, the ignition signal line, as a power input terminal, is often accompanied by high-frequency noise interference from other electronic devices. If this high-frequency noise directly enters the subsequent stages, it can easily lead to erroneous logic judgments in the control nodes. Therefore, this embodiment adds a filtering module to filter out high-frequency interference glitches on the ignition signal line. In specific applications, this filtering module can use a filter capacitor C2. When the circuit is working normally, the DC level input to the ignition signal line cannot pass through the filter capacitor C2, allowing the ignition signal IGNTION to be transmitted normally to the subsequent stages, providing driving force. When high-frequency noise is mixed in with the ignition signal line, the filter capacitor C2 presents an extremely low impedance path for such high-frequency interference signals. At this time, the high-frequency interference components will preferentially choose to be discharged to ground through the filter capacitor C2.

[0044] As can be seen, this embodiment ensures the stability of the IGNTION waveform of the input stage circuit by setting a filtering module, thereby improving the circuit's anti-high frequency interference capability and operational stability.

[0045] As an optional embodiment, it also includes: First anti-backflow isolation module and second anti-backflow isolation module; The first anti-reverse leakage isolation module is connected in series on the ignition signal line to unidirectionally isolate the ignition signal IGNTION and suppress reverse leakage current. The first terminal of the second anti-backflow isolation module is connected to the status signal DETENT, and the second terminal of the second anti-backflow isolation module is connected to the control terminal of the second controllable switch T2, which is used to unidirectionally isolate the status signal DETENT and suppress reverse leakage current.

[0046] Specifically, in vehicle control circuits, current backflow can easily occur between different signal lines due to voltage level differences. For example, when the ignition signal line is de-energized but a residual voltage level exists in the downstream control node, or when the status signal DETENT line is at a high level, without isolation protection, current can easily flow back into the upstream circuit, causing overvoltage burnout of upstream components or triggering logic errors. Therefore, this embodiment introduces a first anti-backflow isolation module and a second anti-backflow isolation module. The first anti-backflow isolation module provides unidirectional isolation for the ignition signal IGNTION and suppresses reverse leakage current, while the second anti-backflow isolation module provides unidirectional isolation for the status signal DETENT and suppresses reverse leakage current. In practical applications, the first anti-backflow isolation module can be implemented using a first isolation diode D4, and the second anti-backflow isolation module can be implemented using a second isolation diode D5.

[0047] Specifically, when the ignition signal IGNTION is input normally, the first anti-reverse flow isolation module is forward-biased, and the ignition signal IGNTION flows to the subsequent indicator light circuit 2. When there is no power supply to the ignition signal line, the first anti-reverse flow isolation module is reverse-biased, completely disconnecting the subsequent circuit from the preceding ignition signal line. When the status signal DETENT is in a low-level active state, the second anti-reverse flow isolation module is turned on. When the status signal DETENT is in a high-level state, the second anti-reverse flow isolation module is in a reverse-biased cutoff state, thereby isolating the external status control circuit from the internal control circuit.

[0048] As can be seen, this embodiment effectively avoids the risk of current backflow and improves the working stability of the control circuit by setting up a first anti-backflow isolation module and a second anti-backflow isolation module.

[0049] As an optional embodiment, the output buffer module includes: The second resistor R2 and the third resistor R3; The first end of the second resistor R2 is connected to the first end of the third resistor R3 and serves as the input end of the output buffer module; the second end of the second resistor R2 is connected to the second end of the third resistor R3 and serves as the output end of the output buffer module.

[0050] Specifically, during startup or high-frequency switching under dimming signals, the light-emitting module is prone to transient current surges or high-frequency oscillations. These sudden current changes shorten the lifespan of the light-emitting device and affect circuit stability. Therefore, this embodiment includes an output buffer module to limit and buffer the output drive current. During operation, the second resistor R2 and the third resistor R3 smooth out the rise time rate of the output current, suppressing oscillations generated during high-frequency switching.

[0051] As can be seen, this embodiment effectively improves the stability of the circuit during operation by setting the second resistor R2 and the third resistor R3 to form an output buffer module. Furthermore, the parallel second resistor R2 and the third resistor R3 can effectively distribute the current flowing through the output buffer module, thereby evenly distributing the heat generation on the two resistors and improving the thermal stability of the circuit board under long-term high-frequency dimming conditions.

[0052] As an optional embodiment, the light-emitting module includes: Capacitor C1, LED D3, and fourth resistor R4; The first terminal of capacitor C1 is connected to the first terminal of LED D3 and the first terminal of fourth resistor R4, and serves as the input terminal of the light-emitting module; the second terminal of capacitor C1 is connected to the second terminal of LED D3 and the second terminal of fourth resistor R4, and serves as the output terminal INDICATOR OUT of the light-emitting module.

[0053] Specifically, LED D3 is prone to high-frequency flickering under high-frequency pulse signal drive and generates high-frequency voltage ripple during rapid switching, thus requiring a filtering circuit. When the dimming signal drives indicator circuit 2, capacitor C1 charges and stores energy when LED D3 is emitting light, and releases energy during the tiny gap when LED D3 is off, thereby smoothing and filtering the voltage across LED D3. Furthermore, a fourth resistor R4 is connected in parallel across LED D3, providing a static discharge path. When the circuit is not operating, or when there is a weak leakage current in the preceding stage, this weak leakage current will preferentially be discharged through the resistor, rather than flowing through LED D3. Additionally, the output terminal INDICATOR OUT of the light-emitting module can be directly grounded or connected to the next stage circuit.

[0054] As can be seen, this embodiment suppresses the flickering and transient spikes of LED D3 by setting capacitor C1. In addition, by setting the fourth resistor R4, it avoids the LED D3 from not being completely cut off due to leakage current when it is off.

[0055] As an optional embodiment, a bias resistor R7 is also included; the bias resistor R7 is connected in series on the ignition signal line.

[0056] Specifically, the first terminal of the first controllable switch T1 is connected not only to the ignition signal line but also to the control terminal of the indicator light circuit 2. The potential of this node needs to switch stably between high and low potentials according to the on and off states of the first controllable switch T1 in order to reliably drive the control terminal of the indicator light circuit 2. If the ignition signal line is directly and without impedance connected to this node, when the first controllable switch T1 is on, this node will directly pull the ignition signal line to ground potential, which is equivalent to the ignition signal line being directly short-circuited to ground through the first controllable switch T1. On the one hand, this will generate a large instantaneous current surge on the ignition signal line, and on the other hand, it will be impossible to establish a stable and controllable potential switching relationship for this node. Therefore, a bias resistor R7 is connected in series on the ignition signal line. On the one hand, it limits the current when the first controllable switch T1 is on, avoiding a direct short circuit between the ignition signal line and ground; on the other hand, it ensures that the control terminal of the indicator light circuit 2 can be stably kept at a high potential when the first controllable switch T1 is off, thereby establishing reliable driving conditions.

[0057] As can be seen, this embodiment establishes stable driving conditions for the control terminal of the indicator light circuit 2 by setting the bias resistor R7.

[0058] To address the aforementioned technical problems, the present invention also provides a vehicle including the aforementioned vehicle indicator light control circuit.

[0059] For an introduction to the vehicle provided by this invention, please refer to the embodiment of the vehicle indicator light control circuit; the invention will not be described in detail here.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A vehicle indicator light control circuit, characterized in that, include: Dimming signal processing module, first controllable switch, second controllable switch, indicator light circuit; The dimming signal processing module has its first input terminal connected to the positive terminal of the lighting, its second input terminal connected to the negative terminal of the lighting, and its output terminal connected to the control terminal of the first controllable switch and the first terminal of the second controllable switch. The output terminal of the dimming signal processing module is used to output a dimming signal according to the level states of the positive and negative terminals of the lighting to control the first controllable switch to alternately turn on and off. The first terminal of the first controllable switch is connected to the control terminal of the ignition signal line and the indicator light circuit, and the second terminal of the first controllable switch is grounded. The control terminal of the second controllable switch is connected to a status signal, and the second terminal of the second controllable switch is grounded; The indicator light circuit is used to enter a lit state when an ignition signal is received.

2. The vehicle indicator light control circuit as described in claim 1, characterized in that, The dimming signal processing module includes: A first diode, a first resistor, and a second diode; The anode of the first diode is connected to the positive terminal of the lighting circuit, and the cathode of the first diode is connected to the first terminal of the first resistor. The second terminal of the first resistor is connected to the anode of the second diode and the control terminal of the first controllable switch. The cathode of the second diode is connected to the negative terminal of the lighting circuit.

3. The vehicle indicator light control circuit as described in claim 1, characterized in that, The indicator light circuit includes: Third controllable switch, output buffer module, light-emitting module; The control terminal of the third controllable switch serves as the control terminal of the indicator light circuit. The first terminal of the third controllable switch is connected to the ignition signal line, and the second terminal of the third controllable switch is connected to the input terminal of the output buffer module. The output terminal of the output buffer module is connected to the input terminal of the light-emitting module, and the output terminal of the light-emitting module is connected to the next-level circuit or ground.

4. The vehicle indicator light control circuit as described in claim 1, characterized in that, It also includes a transient voltage clamping module; the first end of the transient voltage clamping module is connected to the ignition signal line, and the second end of the transient voltage clamping module is grounded.

5. The vehicle indicator light control circuit as described in claim 1, characterized in that, It also includes a filtering module; the first end of the filtering module is connected to the ignition signal line, and the second end of the filtering module is grounded.

6. The vehicle indicator light control circuit as described in claim 1, characterized in that, Also includes: First anti-backflow isolation module and second anti-backflow isolation module; The first anti-backflow isolation module is connected in series on the ignition signal line to unidirectionally isolate the ignition signal and suppress reverse leakage current. The first end of the second anti-backflow isolation module is connected to the status signal, and the second end of the second anti-backflow isolation module is connected to the control terminal of the second controllable switch, which is used to unidirectionally isolate the status signal and suppress reverse leakage current.

7. The vehicle indicator light control circuit as described in claim 3, characterized in that, The output buffer module includes: The second and third resistors; The first end of the second resistor is connected to the first end of the third resistor and serves as the input end of the output buffer module; the second end of the second resistor is connected to the second end of the third resistor and serves as the output end of the output buffer module.

8. The vehicle indicator light control circuit as described in claim 7, characterized in that, The light-emitting module includes: Capacitor, LED, and fourth resistor; The first end of the capacitor is connected to the first end of the light-emitting diode and the first end of the fourth resistor, and serves as the input end of the light-emitting module; the second end of the capacitor is connected to the second end of the light-emitting diode and the second end of the fourth resistor, and serves as the output end of the light-emitting module.

9. The vehicle indicator light control circuit as described in any one of claims 1 to 8, characterized in that, It also includes a bias resistor; the bias resistor is connected in series on the ignition signal line.

10. A vehicle, characterized in that, Includes the vehicle indicator light control circuit as described in any one of claims 1 to 9.

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