Key indicating lamp lighting circuit of danger alarm lamp and vehicle danger alarm lamp

Abstract

The utility model discloses a key indicating lamp lighting circuit of a danger alarm lamp and a vehicle danger alarm lamp, relates to the field of electronic circuits, and solves the problem that the lighting switching of an alarm key indicating lamp is controlled by a BCM (Body Control Module). The D flip-flop outputs a level signal to the phase inverter, and the phase inverter inverts the signal to serve as a clock signal of the D flip-flop. The switching of the trigger signal means the switching of the clock signal, and as the two output ends of the D trigger output opposite level signals at the same moment, only one power supply circuit can be switched on at the same moment to supply power to the indicator lamp. According to the utility model, the indicating lamp is ensured not to receive power supplied by the two power supply circuits at the same time, possible circuit conflict and indicating lamp damage are avoided, an electronic self-locking circuit is realized through discrete components, namely the D trigger and the phase inverter, and illumination switching of the alarm key indicating lamp is realized at low cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic circuit field especially is dangerous alarm lamp's button indicating lamp lighting circuit and vehicle dangerous alarm lamp. BACKGROUND

[0002] In modern cars, in order to improve driving safety and deal with emergency situations, vehicles are usually equipped with a hazard warning light system. One of the core components of this system is the hazard warning light button located on the vehicle center console, and the button indicator light associated with it. The vehicle's body controller (BCM) is responsible for controlling many electronic systems of the vehicle, including the hazard warning light (also known as double flash or emergency flash).

[0003] After the vehicle starts, in the case of normal driving, the button indicator light of the hazard warning light will remain on to remind the driver that the function is available. When the driver presses the hazard warning light button to activate the function, the BCM controls the button indicator light to start flashing at a certain frequency. This flashing mode is to let the driver know that the hazard warning light has been activated, and if it is a false trigger, it can be turned off in time.

[0004] In some vehicle architecture designs, considering system stability and decentralization design, the BCM does not control the button indicator light, and the switching of the button indicator light is required to be implemented inside the warning light.

[0005] Therefore, how to solve the problem of BCM control of the switching of the warning button indicator light illumination is a technical problem that needs to be solved by people in the field. SUMMARY

[0006] The utility model discloses a kind of button indicating lamp lighting circuit and vehicle dangerous alarm lamp of hazard warning light, solve the switching of the warning illumination problem of BCM control.

[0007] To solve the above technical problems, the utility model provides a kind of button indicating lamp lighting circuit of hazard warning light, comprising:

[0008] Trigger module, inverter, D trigger, first power supply circuit, second power supply circuit, indicator light, first capacitor, first resistance according to whether receiving trigger signal output opposite level signal;Wherein, the first power supply circuit, the second power supply circuit output two different power signals of flashing or constant, and conduction under the same level signal;

[0009] The output end of the trigger module is connected with the input end of the inverter, the output end of the inverter is connected with the clock input port of the D flip-flop, the set end of the D flip-flop is grounded, and the reset end of the D flip-flop is connected with the first end of the first capacitor and the first end of the first resistor; the second end of the first capacitor is connected with a power supply, and the second end of the first resistor is grounded; the data input end of the D flip-flop is connected with the inverting output end of the D flip-flop, and the non-inverting output end of the D flip-flop is connected with the control end of the first power supply circuit; the inverting output end of the D flip-flop is connected with the control end of the second power supply circuit; and the indicator lamp is connected with the output end of the first power supply circuit and the output end of the second power supply circuit.

[0010] As an optional solution, in the key indicator lamp lighting circuit of the danger alarm lamp, the trigger module comprises a trigger key, a second resistor, a third resistor and a second capacitor.

[0011] The first end of the second resistor and the first end of the second capacitor are connected with a power supply, the second end of the second resistor and the second end of the second capacitor are connected with the first end of the trigger key, the second end of the trigger key is grounded through the third resistor, and the first end of the trigger key is connected with the input end of the inverter.

[0012] As an optional solution, in the key indicator lamp lighting circuit of the danger alarm lamp, the first power supply circuit comprises a first switch tube and a first power supply.

[0013] The control end of the first switch tube is connected with the non-inverting output end of the D flip-flop, the input end of the first switch tube is connected with the output end of the first power supply, and the output end of the first switch tube is connected with the first end of the indicator lamp and the second end of the indicator lamp is grounded.

[0014] As an optional solution, in the key indicator lamp lighting circuit of the danger alarm lamp, the second power supply circuit comprises a second switch tube and a second power supply.

[0015] The control end of the second switch tube is connected with the inverting output end of the D flip-flop, the input end of the second switch tube is connected with the output end of the second power supply, and the output end of the second switch tube is connected with the first end of the indicator lamp and the second end of the indicator lamp is grounded.

[0016] As an optional solution, in the key indicator lamp lighting circuit of the danger alarm lamp, the key indicator lamp lighting circuit further comprises a first diode and a second diode.

[0017] The output end of the first power supply is connected with the anode of the first diode, and the cathode of the first diode is connected with the input end of the first switch tube.

[0018] The output end of the second power supply is connected with the positive pole of the second diode, and the negative pole of the second diode is connected with the input end of the second switch tube.

[0019] As an alternative, in the key indicator lamp lighting circuit of the danger alarm lamp, the first switch tube is a PNP triode, the first power supply is a voltage stabilizing power supply, and the indicator lamp is a light emitting diode.

[0020] As an alternative, in the key indicator lamp lighting circuit of the danger alarm lamp, the second switch tube is a PNP triode, and the second power supply is a pulse power supply.

[0021] As an alternative, in the key indicator lamp lighting circuit of the danger alarm lamp, the key indicator lamp lighting circuit further comprises a filter circuit.

[0022] The filter circuit comprises a fifth resistor and a third capacitor.

[0023] The first end of the third capacitor is connected with the clock input port of the D flip-flop, the second end of the third capacitor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is grounded.

[0024] As an alternative, in the key indicator lamp lighting circuit of the danger alarm lamp, the trigger key is an automatic reset key.

[0025] To solve the above technical problems, the utility model further provides a vehicle danger alarm lamp which comprises the key indicator lamp lighting circuit of the danger alarm lamp.

[0026] The key indicating lamp lighting circuit of the danger alarm lamp provided by the utility model, comprising: a first power supply circuit, a second power supply circuit outputs two different power supply signals of flickering or constant brightness, and is conducted under the same level signal; the output end of a trigger module is connected with the input end of an inverter, the output end of the inverter is connected with the clock input port of a D flip-flop, the setting end of the D flip-flop is grounded, and the reset end of the D flip-flop is connected with the first end of a first capacitor and the first end of a first resistor; the second end of the first capacitor is connected with a power supply, and the second end of the first resistor is grounded; the data input end of the D flip-flop is connected with the inverse output end of the D flip-flop, and the same phase output end of the D flip-flop is connected with the control end of the first power supply circuit; the inverse output end of the D flip-flop is connected with the control end of the second power supply circuit; the indicating lamp is connected with the output end of the first power supply circuit and the output end of the second power supply circuit.In the application, the trigger module is used for detecting external trigger signals, when the trigger module detects a trigger signal, it outputs a level signal to the inverter, and the inverter reverses the signal again as the clock signal of the D flip-flop.The switching of the trigger signal means the switching of the clock signal, since the two output ends of the D flip-flop output opposite level signals at the same time, only one power supply circuit is conducted at the same time, and the indicating lamp is powered.The application ensures that the indicating lamp cannot receive the power supply of the two power supply circuits at the same time, avoids possible circuit conflicts and indicating lamp damage, and realizes the lighting switching of the alarm key indicating lamp through the discrete components D flip-flop and inverter, and low cost.

[0027] In addition, the utility model also provides a kind of danger alarm lamp for vehicle, including the key indicating lamp lighting circuit of the danger alarm lamp described above, effect is same above. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model, the drawings needed in the embodiments will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for those skilled in the art.

[0029] Figure 1 A kind of key indicating lamp lighting circuit of the danger alarm lamp is provided for the embodiment of the application;

[0030] Figure 2 A kind of timing chart is provided for the embodiment of the application. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0032] The core of the utility model provides a kind of key indicator light illumination circuit of dangerous alarm lamp and vehicle dangerous alarm lamp.

[0033] In order to make the personnel in this technical field better understand the utility model scheme, the utility model is further described in detail below with reference to the drawings and specific embodiments.

[0034] When vehicle fails on road, in order to guarantee safety, avoid accident, it is often necessary to remind other vehicles to warn danger. Generally, driver needs to turn on dangerous alarm lamp and place dangerous warning sign behind vehicle. Dangerous alarm lamp key is usually located in the eye-catching position of vehicle center console, to facilitate driver to access quickly. Allow driver to activate the dangerous alarm lamp of vehicle quickly in emergency, to remind other road users.

[0035] Key indicator light is integrated with dangerous alarm lamp key, and is usually located in the center or around the key. Visual feedback is provided to driver, indicating the state of dangerous alarm lamp.

[0036] Constant state: when vehicle starts and dangerous alarm lamp is not activated, key indicator light keeps constant. This indicates that dangerous alarm lamp function is normal, but is not activated at present.

[0037] Flashing state: when driver presses dangerous alarm lamp key to activate the function, key indicator light starts to flash at a certain frequency. This flashing mode is to let driver know that dangerous alarm lamp has been activated.

[0038] Activation of dangerous alarm lamp and flashing of indicator light are usually controlled by body control module (BCM). BCM receives signal from dangerous alarm lamp key, and controls the state of tail light double flasher and key indicator light accordingly.

[0039] In the design of some vehicle architectures, considering system stability, decentralized design can reduce the risk of single point failure. If the central control unit fails, it may cause the entire system to be paralyzed. In the decentralized design, each subsystem can operate independently, so even if a part fails, it will not affect the entire system. If microcontroller unit (MCU) is used to control dangerous alarm lamp separately, it will cause the cost to rise.

[0040] To solve the above problems, the embodiment of the application provides a key indicator lamp lighting circuit of a danger alarm lamp, as shown in the figure, comprising: Figure 1

[0041] The trigger module, the inverter U1, the D flip-flop U2, the first power supply circuit, the second power supply circuit, the indicator lamp, the first capacitor C1 and the first resistor R1 output opposite level signals according to whether a trigger signal is received; the first power supply circuit and the second power supply circuit output two different power supply signals, namely constant light or flickering, and are turned on under the same level signal.

[0042] The output end of the trigger module is connected with the input end of the inverter U1, the output end of the inverter U1 is connected with the clock input port of the D flip-flop U2, the set end of the D flip-flop U2 is grounded, and the reset end of the D flip-flop U2 is connected with the first end of the first capacitor C1 and the first end of the first resistor R1; the second end of the first capacitor C1 is connected with a power supply, and the second end of the first resistor R1 is grounded; the data input end of the D flip-flop U2 is connected with the inverted output end of the D flip-flop U2, and the noninverted output end of the D flip-flop U2 is connected with the control end of the first power supply circuit; the inverted output end of the D flip-flop U2 is connected with the control end of the second power supply circuit; and the indicator lamp is connected with the output end of the first power supply circuit and the output end of the second power supply circuit.

[0043] The trigger module in the embodiment is used for detecting an external trigger signal (such as a user pressing a danger alarm lamp button). If no trigger signal is received, a level signal is output; when a trigger signal is received, an opposite level signal is output.

[0044] The inverter U1 receives the output signal of the trigger module and reverses the level of the output signal, and then transmits the output signal to the clock input port of the D flip-flop U2.

[0045] The D flip-flop U2 is a kind of digital logic circuit, which is used for storing data according to the change of clock signal.

[0046] The data input end (D) of the D flip-flop U2 is used for inputting a data signal, and when the rising edge of the CLK signal comes, the data at the D end is stored in the flip-flop.

[0047] The clock input end (CLK) provides a clock signal, and the flip-flop transmits the data at the D end to the Q end at the rising edge or the falling edge of the CLK signal.

[0048] The output end (Q and ): output the stored data state, the Q end is the original code output, and the end is the inverse code output.

[0049] Set end (SD): When SD is high, the flip-flop is set to a specific state, usually used for initialization.

[0050] Reset end (RD): When RD is high, the flip-flop is cleared, usually used to clear the stored data.

[0051] The two output ends of D flip-flop U2 output opposite level signals at the same time, and the output switching of D flip-flop U2 is controlled through the trigger module. In this circuit, the data input end of D flip-flop U2 is connected with the inverted output end, the non-inverted output end controls the first power circuit, and the inverted output end controls the second power circuit. It should be noted that the first power circuit and the second power circuit are turned on under the same level signal, for example, both are turned on under the low level signal or both are turned on under the high level signal, so as to ensure that only one of the two power circuits is turned on at the same time to supply power to the indicator light. The first power circuit and the second power circuit output two different power signals of flashing or constant brightness, and do not specifically control which one is constant or flashing, and the actual setting can be estimated.

[0052] The indicator light displays the constant or flashing state according to the output signals of the first power circuit and the second power circuit. The type of the indicator light, the color of the light, and the flashing frequency are not limited in this embodiment, and can be set according to actual needs.

[0053] The key indicating lamp lighting circuit of the danger alarm lamp provided by the embodiment comprises a trigger module outputting opposite level signals according to whether a trigger signal is received, an inverter U1, a D flip-flop U2, a first power supply circuit, a second power supply circuit, an indicating lamp, a first capacitor C1, and a first resistor R1; wherein the first power supply circuit and the second power supply circuit output two different power supply signals of flashing or constant brightness, and are turned on under the same level signal; the output end of the trigger module is connected with the input end of the inverter U1, the output end of the inverter U1 is connected with the clock input port of the D flip-flop U2, the set end of the D flip-flop U2 is grounded, and the reset end of the D flip-flop U2 is connected with the first end of the first capacitor C1 and the first end of the first resistor R1; the second end of the first capacitor C1 is connected with a power supply, and the second end of the first resistor R1 is grounded; the data input end of the D flip-flop U2 is connected with the inverted output end of the D flip-flop U2, and the same phase output end of the D flip-flop U2 is connected with the control end of the first power supply circuit; the inverted output end of the D flip-flop U2 is connected with the control end of the second power supply circuit; and the indicating lamp is connected with the output end of the first power supply circuit and the output end of the second power supply circuit. In the application, the trigger module is used for detecting an external trigger signal, when the trigger module detects the trigger signal, it outputs a level signal to the inverter U1, and the inverter U1 reverses the signal as the clock signal of the D flip-flop U2. The switching of the trigger signal means the switching of the clock signal, and since the two output ends of the D flip-flop U2 output opposite level signals at the same time, only one power supply circuit is turned on at the same time to supply power to the indicating lamp. It is ensured that the indicating lamp cannot receive the power supply of the two power supply circuits at the same time, and the possible circuit conflict and damage of the indicating lamp are avoided. The electronic self-locking circuit is realized by the discrete components D flip-flop U2 and inverter U1, and the lighting switching of the alarm key indicating lamp is realized at low cost.

[0054] According to the above embodiment, the trigger module can not only respond to the key operation of the user, but also provide a stable trigger signal to ensure that the D flip-flop U2 reliably switches the state to control the constant brightness or flashing of the indicating lamp. The embodiment provides a specific embodiment scheme, and the trigger module comprises a trigger key K1, a second resistor R2, a third resistor R3, and a second capacitor C2.

[0055] The first end of the second resistor R2 and the first end of the second capacitor C2 are connected with a power supply, the second end of the second resistor R2, the second end of the second capacitor C2, and the first end of the trigger key K1 are connected, the second end of the trigger key K1 is grounded through the third resistor R3, and the first end of the trigger key K1 is connected with the input end of the inverter U1.

[0056] The trigger button K1 is used for user operation, triggering the alarm or indicating the switching of the light state. The second resistor R2 is used to limit the current and stabilize the voltage. The third resistor R3 is used as a pull-down resistor for the trigger button K1, ensuring that the button end output is low when pressed. The second capacitor C2 is used to eliminate button jitter or delay triggering, providing a stable trigger signal.

[0057] When the trigger button K1 is not pressed, the input of the inverter U1 is high, and the output of the inverter U1 is low. When the trigger button K1 is pressed, the input of the inverter U1 is low, and the output of the inverter U1 is high. This level change is transmitted to the D flip-flop U2 through the inverter U1, triggering the state update of the D flip-flop U2.

[0058] According to the above embodiment, the trigger module not only responds to the user's button operation, but also provides a stable trigger signal, ensuring that the D flip-flop U2 reliably switches states, thereby controlling the constant or flashing of the indicator light. This embodiment provides a specific implementation scheme, and the first power supply circuit includes: a first switch tube Q1, a first power supply Ignition;

[0059] The control end of the first switch tube Q1 is connected to the non-inverted output end of the D flip-flop U2, the input end of the first switch tube Q1 is connected to the first power supply Ignition, and the output end of the first switch tube Q1 is connected to the indicator light.

[0060] The second power supply circuit includes: a second switch tube Q2, a second power supply Blinker2;

[0061] The control end of the second switch tube Q2 is connected to the inverted output end of the D flip-flop U2, the input end of the second switch tube Q2 is connected to the second power supply Blinker2, and the output end of the second switch tube Q2 is connected to the indicator light.

[0062] The first switch tube Q1 of the first power supply Ignition circuit controls the conduction and cutoff of the first power supply Ignition circuit, and the first power supply Ignition provides power for the indicator light.

[0063] The second switch tube Q2 of the second power supply Blinker2 circuit controls the conduction and cutoff of the second power supply Blinker2 circuit, and the second power supply Blinker2 provides power for the indicator light.

[0064] The control end of the first switch tube Q1 is connected to the non-inverted output end of the D flip-flop U2, the input end is connected to the first power supply Ignition, and the output end is connected to the indicator light; the control end of the second switch tube Q2 is connected to the inverted output end of the D flip-flop U2, the input end is connected to the second power supply Blinker2, and the output end is connected to the indicator light.

[0065] The non-inverting output of the D flip-flop U2: When the non-inverting output of the D flip-flop U2 is high, the second switch Q2 is turned on (or low, depending on the design); when the non-inverting output of the D flip-flop U2 is low, the second switch Q2 is turned off (or high, depending on the design).

[0066] The non-inverting output of the D flip-flop U2: When the non-inverting output of the D flip-flop U2 is high, the second switch Q2 is turned on (or low, depending on the design); when the non-inverting output of the D flip-flop U2 is low, the second switch Q2 is turned off (or high, depending on the design).

[0067] According to the output of the D flip-flop U2, the two switches cannot be turned on at the same time, ensuring that the indicator light is powered by only one power supply circuit at any time. When the first switch Q1 is turned on, the indicator light is always on; when the second switch Q2 is turned on, the indicator light flashes.

[0068] When designing, you can determine whether the switch is turned on at high or low level according to actual needs. This usually depends on the characteristics of other circuit elements and the logic requirements of the entire system.

[0069] The first power supply Ignition and the second power supply Blinker2 need to provide stable voltage and current to ensure that the indicator light works stably in different states. The power supply circuit that controls the flashing may need additional circuits (such as an oscillator circuit or a pulse width modulation (PWM) controller) to control the flashing frequency and brightness.

[0070] Specifically, it also includes: the first diode D1, the second diode D2;

[0071] The output end of the first power supply Ignition is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the input end of the first switch Q1;

[0072] The output end of the second power supply Blinker2 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the input end of the second switch Q2.

[0073] Prevent current from flowing in reverse direction through diodes to protect switches from damage.

[0074] When the first power supply Ignition circuit is activated, the current flows from the output end of the first power supply Ignition, through the anode of the first diode D1, through the cathode of the diode, and then flows into the input end of the first switch Q1, and finally reaches the indicator light. The first diode D1 ensures that the current can only flow in one direction, preventing the current from flowing back to the first power supply Ignition in reverse.

[0075] When the second power supply Blinker2 circuit is activated, current flows from the output of the second power supply Blinker2, through the anode of the second diode D2, through the cathode of the diode, and then into the input of the second switch tube Q2, finally reaching the indicator light. The second diode D2 ensures that current can only flow in one direction, preventing current from flowing back into the second power supply Blinker2 in reverse.

[0076] By adding a diode, the safety and reliability of the circuit can be improved, ensuring that even in the case of reverse polarity of the power supply or other abnormal situations, the switch tube or indicator light will not be damaged.

[0077] This embodiment provides a specific implementation scheme, the first switch tube Q1 is a PNP (positive-negative-positive) triode, and the first power supply Ignition is a stabilized power supply. The second switch tube Q2 is a PNP triode, and the second power supply Blinker2 is a pulse power supply. The indicator light is a light-emitting diode.

[0078] In this embodiment, the first switch tube Q1 and the second switch tube Q2 are both PNP triodes, but they are connected to different types of power supplies: the first switch tube Q1 is connected to a stabilized power supply, while the second switch tube Q2 is connected to a pulse power supply. In addition, these two switch tubes are designed to be conductive at low levels.

[0079] When the non-inverting output of the D flip-flop U2 is at a low level, the first switch tube Q1 (PNP triode) is turned on, and the stabilized power supply supplies power to the indicator light, causing the indicator light to always be on. When the inverting output of the D flip-flop U2 is at a low level, the second switch tube Q2 (PNP triode) is turned on, and the pulse power supply supplies power to the indicator light, causing the indicator light to flash.

[0080] When the indicator light is a light-emitting diode LED1, the non-inverting output of the D flip-flop U2 is at a low level, the first switch tube Q1 is turned on, and the light-emitting diode obtains current through the first power supply Ignition circuit, emitting a continuous light. When the inverting output of the D flip-flop U2 is at a low level, the second switch tube Q2 is turned on, and the light-emitting diode obtains current through the pulse power supply, achieving a flashing effect.

[0081] Specifically, it also includes a fourth resistor R4 connected in series with the indicator light. The current flowing through the light-emitting diode is limited, protecting the LED from being damaged by excessive current.

[0082] Table 1 is a D flip-flop U2 truth table provided by the embodiment of the present application;

[0083] Table 1 D flip-flop U2 truth table

[0084]

[0085] State C in the above table indicates that the output state of the previous time is maintained unchanged.

[0086] Figure 2 A timing diagram provided for the embodiments of the present application is shown in the following table. Figure 2 When the vehicle is powered on, the R port of the D flip-flop U2 is high, and the S port is low. According to the truth table of the D flip-flop U2, the current state is determined to be state D, the Q port of the D flip-flop U2 outputs a low level, the D port outputs a high level.

[0087] ①When the trigger button K1 is not operated, the output is high, the input of the inverter U1 is high, and the output is low.

[0088] At this time, the first switch tube Q1 is turned on, the second switch tube Q2 is not turned on, and the indicator lamp is lit by the first power Ignition (the indicator lamp is always on).

[0089] ②When the alarm trigger button K1 is pressed, the trigger button K1 is closed, the output end of the trigger button K1 is pulled low, the input end of the inverter U1 is low, and the output end of the inverter U1 and the CLK port of the D flip-flop U2 are high. According to the truth table of the D flip-flop U2, the current state is determined to be state B, the Q port of the D flip-flop U2 outputs a high level, and the the D port of the D flip-flop U2 outputs a low level.

[0090] At this time, the first switch tube Q1 is not turned on, the second switch tube Q2 is turned on, and the indicator lamp is lit by the second power Blinker2 (the indicator lamp is flashing).

[0091] ③When the alarm trigger button K1 is released, the trigger button K1 is opened, the output end of the trigger button K1 is pulled high, the input end of the inverter U1 is high, and the output end of the inverter U1 and the CLK port of the D flip-flop U2 are low. According to the truth table of the D flip-flop U2, the current state is determined to be state C, the Q port of the D flip-flop U2 maintains the same level, the output is high, and the the D port of the D flip-flop U2 maintains the same level, and the output is low.

[0092] At this time, the first switch tube Q1 is not turned on, the second switch tube Q2 is turned on, and the indicator lamp is lit by the second power Blinker2 (the indicator lamp is still flashing).

[0093] When the alarm trigger button K1 is pressed again, the trigger button K1 is closed, the output end of the trigger button K1 is pulled low, the input end of the inverter U1 is low, and the output end of the inverter U1 and the CLK port of the D flip-flop U2 are high. According to the D flip-flop U2 truth table, the current state is state A, the Q port of the D flip-flop U2 outputs low, and the D port of the D flip-flop U2 outputs high.

[0094] At this time, the first switch tube Q1 is turned on, the second switch tube Q2 is not turned on, and the indicator light is lit by the first power Ignition (the indicator light is always on).

[0095] When the alarm trigger button K1 is pressed again, the trigger button K1 is closed, the output end of the trigger button K1 is pulled low, the input end of the inverter U1 is low, and the output end of the inverter U1 and the CLK port of the D flip-flop U2 are high. According to the D flip-flop U2 truth table, the current state is state A, the Q port of the D flip-flop U2 outputs low, and the D port of the D flip-flop U2 outputs high.

[0096] At this time, the first switch tube Q1 is turned on, the second switch tube Q2 is not turned on, and the indicator light is lit by the first power Ignition (the indicator light is always on).

[0097] The whole process is realized by the inverter U1 and the D flip-flop U2, and the operation of twice is a period.

[0098] Specifically, the trigger button K1 is an automatic reset button.

[0099] Further, it also includes a filter circuit.

[0100] The filter circuit includes a fifth resistor R5 and a third capacitor C3.

[0101] The first end of the third capacitor C3 is connected with the clock input port of the D flip-flop U2, the second end of the third capacitor C3 is connected with the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is grounded.

[0102] The fifth resistor R5 and the third capacitor C3 form an RC filter together, so that the CLK port of the D flip-flop U2 gets a clean signal.

[0103] Finally, the application also provides a vehicle danger alarm lamp, which includes the above-mentioned key indicator light illumination circuit of the danger alarm lamp.

[0104] ​​The key indicating lamp lighting circuit of the dangerous alarm lamp and the vehicle dangerous alarm lamp provided by the utility model are described in detail. The embodiments in the specification are described in a progressive manner, and each embodiment mainly describes the difference from other embodiments. The same or similar parts of each embodiment can be referred to. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method part. It should be pointed out that for ordinary skilled persons in the technical field, without departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the utility model claims.

[0105] It should also be noted that in this specification, relational terms such as first and second are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article, or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of additional identical elements in the process, method, article, or device including the element.

Claims

1. A key indicator lamp lighting circuit for a hazard warning light, characterized by, The application relates to a trigger module, an inverter, a D trigger, a first power supply circuit, a second power supply circuit, an indicator lamp, a first capacitor and a first resistor. The output end of the trigger module is connected with the input end of the inverter, the output end of the inverter is connected with the clock input port of the D trigger, the setting end of the D trigger is grounded, and the reset end of the D trigger is connected with the first end of the first capacitor and the first end of the first resistor; the second end of the first capacitor is connected with a power supply, and the second end of the first resistor is grounded; the data input end of the D trigger is connected with the inverting output end of the D trigger, the same phase output end of the D trigger is connected with the control end of the first power supply circuit, the inverting output end of the D trigger is connected with the control end of the second power supply circuit, and the indicator lamp is connected with the output end of the first power supply circuit and the output end of the second power supply circuit. The trigger module comprises a trigger button, a second resistor, a third resistor and a second capacitor.

2. The key indicator lamp lighting circuit for a hazard warning light according to claim 1, characterized by, The first end of the second resistor and the first end of the second capacitor are connected with a power supply, the second end of the second resistor and the second end of the second capacitor are connected with the first end of the trigger button, the second end of the trigger button is grounded through the third resistor, and the first end of the trigger button is connected with the input end of the inverter. The first power supply circuit comprises a first switch tube and a first power supply.

3. The key indicator light illumination circuit for a hazard warning light according to claim 1, wherein The control end of the first switch tube is connected with the same phase output end of the D trigger, the input end of the first switch tube is connected with the output end of the first power supply, the output end of the first switch tube is connected with the first end of the indicator lamp, and the second end of the indicator lamp is grounded. The second power supply circuit comprises a second switch tube and a second power supply.

4. The key indicator light illumination circuit for a hazard warning light according to claim 3, wherein The control end of the second switch tube is connected with the inverting output end of the D trigger, the input end of the second switch tube is connected with the output end of the second power supply, the output end of the second switch tube is connected with the first end of the indicator lamp, and the second end of the indicator lamp is grounded. The first diode and the second diode are further included.

5. The key indicator light illumination circuit for a hazard warning light according to claim 4, wherein The output end of the first power supply is connected with the anode of the first diode, and the cathode of the first diode is connected with the input end of the first switch tube. The output end of the second power supply is connected with the anode of the second diode, and the cathode of the second diode is connected with the input end of the second switch tube. The first switch tube is a PNP triode, the first power supply is a stabilized power supply, and the indicator lamp is a light-emitting diode. The second switch tube is a PNP triode, and the second power supply is a pulse power supply.

6. The key indicator light illumination circuit for a hazard warning light of claim 3, wherein, The filter circuit is further included.

7. The key indicator light illumination circuit for a hazard warning light of claim 5, wherein, The filter circuit comprises a fifth resistor and a third capacitor.

8. The key indicator light illumination circuit for a hazard warning light of claim 1, wherein, The first end of the third capacitor is connected with the clock input port of the D trigger, the second end of the third capacitor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is grounded. The trigger button is an automatic reset button. ​ ​ 9. The key indicator light illumination circuit for a hazard warning light according to claim 2, wherein, ​ 10. A hazard warning light for a vehicle, characterized by A key indicator lamp lighting circuit including the hazard warning lamp of any one of claims 1-9.

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