WO2019128544A1 - 转向灯跛行驱动电路 - Google Patents

转向灯跛行驱动电路 Download PDF

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Publication number
WO2019128544A1
WO2019128544A1 PCT/CN2018/116521 CN2018116521W WO2019128544A1 WO 2019128544 A1 WO2019128544 A1 WO 2019128544A1 CN 2018116521 W CN2018116521 W CN 2018116521W WO 2019128544 A1 WO2019128544 A1 WO 2019128544A1
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Prior art keywords
transistor
circuit
resistor
driving circuit
capacitor
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PCT/CN2018/116521
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English (en)
French (fr)
Inventor
王帅
熊磊
白日光
李春红
申晓磊
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联合汽车电子有限公司
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Publication of WO2019128544A1 publication Critical patent/WO2019128544A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • B60Q1/46—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for giving flashing caution signals during drive, other than signalling change of direction, e.g. flashing the headlights or hazard lights
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to the field of vehicle controller technology, and in particular, to a turn signal driving circuit.
  • the CCM's limp home function means that certain basic functions can be maintained when a serious system failure occurs in the body controller. These functions include important functions such as low beam, wiper and brake light.
  • the hardware design method is to design a bypass circuit (fault signal S1 input and At one end of the door, when the mechanical switch K1 is closed, a signal short-circuited to ground is input to the other end of the AND gate, and the AND gate is turned on and sends a switching signal to the driving chip 50), and the switching signal directly crosses the main when the main control chip 70 fails.
  • the chip 70 is controlled to control the output of the driver chip 50, and the driver chip 50 drives the load circuit 60.
  • the danger warning light function when the body controller is in serious system failure, the turn signal (hazard warning light) can still maintain its basic function and flash at a certain frequency. Due to the requirement that the steering lights (hazard warning lights) flash at a certain frequency in the event of a serious system failure, there are two technical points in the hardware design: when the body controller has a serious system failure, the relevant backup (carrying) Function) The circuit can be enabled.
  • backup (carry function) circuit During normal operation, the part of the backup (carry function) circuit does not work; due to a serious system failure of the body controller, the system clock is out of control, flashing at a certain frequency requires backup (carry function) circuit Contains clock source circuits that can operate independently; these two technical points are not designed for traditional body controller designs.
  • the present invention provides a turn signal driving circuit including a power supply circuit, a switching circuit, a clock circuit and a driving circuit, wherein:
  • the power supply circuit supplies power to the switch circuit and the drive circuit
  • the switching circuit includes a first transistor, and the first transistor is turned on when receiving a system fault signal, so that the power supply circuit supplies power to the clock circuit through the first transistor;
  • the clock circuit includes a first charging circuit and a second charging circuit, and the first charging circuit and the second charging circuit are alternately charged and discharged to enable the clock circuit to provide a clock signal to the driving circuit;
  • the driving circuit drives the turn signal to blink according to the clock signal.
  • the power supply circuit includes a DC voltage source and a power switch, and the power switch is connected between the DC voltage source and the switch circuit, and the DC voltage is A source is coupled to the drive circuit.
  • the turn signal driving circuit further includes a voltage stabilizing circuit, and the voltage stabilizing circuit includes a first resistor, a first capacitor, a second transistor, and a Zener tube.
  • the second transistor is an NPN type transistor, wherein:
  • a base of the second transistor is connected to a negative pole of the voltage regulator tube, a collector of the second transistor is connected to the power supply circuit, and an emitter of the second transistor is connected to the switch circuit;
  • the positive pole of the voltage regulator tube is grounded
  • One end of the first resistor is connected to the base of the second transistor, and the other end is connected to the power supply circuit;
  • One end of the first capacitor is connected to the base of the second transistor, and the other end is grounded;
  • the voltage regulator of the voltage regulator is 5V to 6V.
  • the switching circuit further includes a second resistor, a third resistor, and a second capacitor, wherein the first transistor is a PNP type transistor, wherein:
  • a base of the first transistor is connected to one end of the third resistor, and another end of the third resistor is input to the system fault signal, and a collector of the first transistor is connected to the clock circuit, the first An emitter of the transistor is coupled to an emitter of the second transistor;
  • One end of the second resistor is connected to the base of the first transistor, and the other end is connected to the collector of the first transistor;
  • One end of the second capacitor is connected to the collector of the first transistor, and the other end is grounded.
  • the clock circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third capacitor, a fourth capacitor, and a third a transistor, a fourth transistor, and a fifth transistor, wherein:
  • the third transistor, the fourth transistor, and the fifth transistor are all NPN type transistors
  • the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, and one end of the ninth resistor are connected to a collector of the first transistor;
  • the other end of the fifth resistor is connected to the collector of the third transistor
  • the other end of the sixth resistor is connected to the base of the fourth transistor
  • the other end of the seventh resistor is connected to the base of the third transistor
  • the other end of the eighth resistor is connected to the collector of the fourth transistor
  • the other end of the ninth resistor is connected to the collector of the fifth transistor
  • One end of the third capacitor is connected to the collector of the third transistor, and the other end is connected to the base of the fourth transistor;
  • the fourth capacitor is connected to the collector of the fourth transistor at one end, and the other end is connected to the base of the third transistor;
  • the emitters of the third transistor, the fourth transistor, and the fifth transistor are grounded;
  • a base of the fifth transistor is coupled to a collector of the fourth transistor, and a collector of the fifth transistor is coupled to the drive circuit.
  • C3 is the capacitance of the third capacitor
  • C4 is the capacitance of the fourth capacitor
  • R6 is the resistance of the sixth resistor
  • R7 is the resistance of the seventh resistor
  • f is the oscillation frequency of the clock circuit.
  • the turn signal driving circuit further includes a mechanical switch and a fourth diode, one end of the mechanical switch is grounded, and the other end is connected to the fourth diode A cathode of the tube, an anode of the fourth diode connecting the emitters of the third transistor and the fourth transistor.
  • the turn signal driving circuit further includes a first diode and a second diode, wherein:
  • the anode of the first diode is connected to the power supply circuit, and the cathode of the first diode is connected to the driving circuit;
  • the anode of the second diode is connected to the power supply circuit, and the cathode of the second diode is connected to the switch circuit.
  • the turn signal is a halogen lamp or a light emitting diode.
  • the driving circuit comprises a high side driving chip or a low side driving chip.
  • the first transistor is turned on by the system fault signal, so that the power supply circuit supplies power to the clock circuit through the first transistor, and the first charging circuit and the second charging circuit alternately charge and discharge.
  • the utility model can ensure the effective operation of the turn signal (hazard warning light) when the body controller is severely damaged, and improve the safety performance of the body controller.
  • the simple component construction is completed, the hardware cost is very low, and it is matched with other chopping function circuits on the body controller, and has good compatibility.
  • the driving chip included in the driving circuit may be a high-side driving chip (power terminal driving) or a low-side driving chip (ground driving), and the frequency of the clock signal generated in the clock circuit can be changed by changing the resistance in the circuit.
  • the parameters of the capacitors are configured.
  • the load circuit can be a halogen lamp load, a light emitting diode (LED), or other load forms.
  • 1 is a schematic diagram of a conventional steering lamp driving circuit
  • FIG. 2 is a schematic diagram of a driving circuit of a turn signal lamp according to an embodiment of the present invention
  • the figure shows: 10-power supply circuit; 20-voltage regulator circuit; 30-switch circuit; 40-clock circuit; 50-drive circuit; 60-turn signal or load circuit; 70-master chip.
  • the core idea of the present invention is to provide a turn signal driving circuit for solving the problem that the existing body controller lacks the driving function of the turn signal.
  • the present invention provides a turn signal driving circuit including a power supply circuit, a switching circuit, a clock circuit and a driving circuit, wherein: the power supply circuit is to the switching circuit and the The driving circuit is powered; the switching circuit includes a first transistor, and the system fault signal turns on the first transistor to enable the power supply circuit to supply power to the clock circuit through the first transistor; the clock circuit includes a first charging circuit and a second charging circuit, the first charging circuit and the second charging circuit alternately charging and discharging, so that the clock circuit provides a clock signal to the driving circuit; the driving circuit is according to the clock The signal drive turn signal flashes.
  • the turn signal driving circuit includes a power supply circuit 10, a switch circuit 30, a clock circuit 40, and a driving circuit 50, wherein: the power supply circuit 10 The switch circuit 30 and the drive circuit 50 are powered; the switch circuit 30 includes a first transistor Q1, and the system fault signal S1 turns on the first transistor Q1 to pass the power supply circuit 10 through the first The transistor Q1 supplies power to the clock circuit 40.
  • the clock circuit 40 includes a first charging circuit and a second charging circuit, and the first charging circuit and the second charging circuit are alternately charged and discharged to make the clock circuit 40 A clock signal S3 is supplied to the drive circuit 50; the drive circuit 50 drives the turn signal 60 to blink according to the clock signal S3.
  • the power supply circuit 10 includes a DC voltage source V1 and a power supply switch K2, and the power supply switch K2 is connected between the DC voltage source V1 and the switch circuit 30.
  • the DC voltage source V1 is connected to the driving circuit 50, and the DC voltage source V1 supplies power to the switching circuit 30 and the driving circuit 50.
  • the power supply switch K2 is used to control the enabling of the turn signal driving circuit.
  • the turn signal driving circuit further includes a first diode D1 and a second diode D2, wherein: the anode of the first diode D1 is connected to the power supply circuit 10, specifically connected to the DC voltage source V1, The anode of the first diode D1 is connected to the driving circuit 50; the anode of the second diode D2 is connected to the power supply circuit 10, specifically connected to the power supply switch K2, and the second diode D2 The negative electrode is connected to the switching circuit 30 or the voltage stabilizing circuit 20; the first diode D1 and the second diode D2 function to protect the power supply circuit 10 from large current surge at the load end.
  • the turn signal driving circuit further includes a voltage stabilizing circuit 20, and the voltage stabilizing circuit 20 includes a first resistor R1, a first capacitor C1, a second transistor Q2, and The Zener diode D3, the second transistor Q2 is an NPN-type transistor, wherein: the base of the second transistor Q2 is connected to the cathode of the Zener diode D3, and the collector of the second transistor Q2 is connected to the power supply
  • the circuit 10 is connected to the power supply switch K2 through a second diode D2, the emitter of the second transistor Q2 is connected to the switch circuit 30; the anode of the Zener diode D3 is grounded;
  • the first resistor R1 is One end is connected to the base of the second transistor Q2, and the other end is connected to the power supply circuit 10, specifically connected to the power supply switch K2 through the second diode D2; one end of the first capacitor C1 is connected to the second transistor Q2 The base of the voltage is connected to the other end; the voltage of the voltage regulator D3
  • the output voltage of the DC voltage source V1 is about 12V.
  • the voltage of D1 is maintained to be greater than 11V, and the voltage of D3 is 5V ⁇ 6V, preferably 5.7V.
  • the positive pole of D3, that is, the voltage of the other end of R1 is 5.7V, then Q2 is turned on, and the emitter voltage of Q2 is lower than the base 0.7V, which is about 5V, and is supplied to the switching circuit 30.
  • the switch circuit 30 further includes a second resistor R2, a third resistor R3, and a second capacitor C2, wherein the first transistor Q1 is a PNP type transistor, wherein: The base of the first transistor Q1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is input to the system fault signal S1, and the collector of the first transistor Q1 is connected to the clock circuit 40.
  • the emitter of the first transistor Q1 is connected to the emitter of the second transistor Q2; one end of the second resistor R2 is connected to the base of the first transistor Q1, and the other end is connected to the first transistor Q1.
  • the clock circuit 40 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a third capacitor C3.
  • the other end of the sixth resistor R6 is connected to the base of the fourth transistor Q4; the other end of the seventh resistor R7 is connected to the base of the third transistor Q3; the other end of the eighth resistor R8 Connecting the collector of the fourth transistor Q4; the other end of the ninth resistor R9 is connected to the collector of the fifth transistor Q5; the third capacitor C3 is connected at one end to the collector of the third transistor Q3, and One end is connected to the base of the fourth transistor Q4; One end of the fourth capacitor C4 is connected to the collector of the fourth transistor Q4, and the other end is connected to the base of the third transistor Q3; the emission of the third transistor Q3, the fourth transistor Q4 and the fifth transistor Q5 The base of the fifth transistor Q5 is connected to the collector of the fourth transistor Q4, and the collector of the fifth transistor Q5 is connected to the drive circuit 50.
  • a positive feedback closed loop is formed by two NOT gates (transistors Q3 and Q4) and C3 and C4.
  • the collector of transistor Q3 is connected to the base of Q4, and the collector of Q4 is connected to the base of Q3.
  • R7 provides the base bias current to the two transistors Q3, Q4 through the base resistors R6 and Q4, causing Q3 and Q4 to enter the amplified state. Due to individual differences between Q3 and Q4, assuming Q3 conducts faster, the collector voltage of Q3 will drop faster. This small difference will be amplified by Q4 and fed back to the base of Q3, and then amplified by Q3. The chain reaction makes Q3 rapidly saturated and Q4 cuts off.
  • the collector voltage of Q4 is 5V, and the collector of Q3 is 0V.
  • the collector of Q3 is 0V.
  • the collector of Q4 is 5V
  • the collector of Q3 is 0V.
  • C3 is The capacitance of the third capacitor
  • C4 is the capacitance of the fourth capacitor
  • R6 is the resistance of the sixth resistor
  • R7 is the resistance of the seventh resistor
  • f is the oscillation frequency of the clock circuit.
  • the turn signal driving circuit further includes a mechanical switch K1 and a fourth diode D4, one end of the mechanical switch K1 is grounded, and the other end is connected to the negative pole of the fourth diode D4, the fourth two
  • the anode of the diode D4 is connected to the emitters of the third transistor Q3 and the fourth transistor Q4.
  • the turn signal 60 is a halogen lamp or a light emitting diode.
  • the drive circuit 50 includes a high side driver chip or a low side driver chip.
  • the first transistor is turned on by the system fault signal, so that the power supply circuit supplies power to the clock circuit through the first transistor, and the first charging circuit and the second charging circuit alternately charge and discharge.
  • the utility model can ensure the effective operation of the turn signal (hazard warning light) when the body controller is severely damaged, and improve the safety performance of the body controller.
  • the simple component construction is completed, the hardware cost is very low, and it is matched with other chopping function circuits on the body controller, and has good compatibility.
  • the driving chip included in the driving circuit may be a high-side driving chip (power terminal driving) or a low-side driving chip (ground driving), and the frequency of the clock signal generated in the clock circuit can be changed by changing the resistance in the circuit.
  • the parameters of the capacitors are configured.
  • the load circuit can be a halogen lamp load, a light emitting diode (LED), or other load forms.
  • the power supply circuit is located outside the BCM and is the power supply of the whole vehicle; the voltage regulator circuit is located inside the BCM, and the function is to regulate the voltage of 12V to a logic level of about 5V; the switch circuit is located inside the BCM, and the function is to level the fault signal. Conversion, when the system is faulty, the S1 signal is a low level signal, the transistor Q1 is turned on, the 5V power supply will supply power to the clock circuit; the clock circuit is located inside the BCM, and the function is to convert the 5V constant power supply to 5V to 0V through self-oscillation. The pulse level of the transition.
  • the drive circuit is located inside the BCM and converts the drive signal into a power signal for external output to drive the electrical load.
  • the load circuit ie, the turn signal
  • the turn signal hazard warning light
  • the mechanical switch K1 is located outside the BCM, and when the steering switch is pressed, it exhibits a short-to-ground characteristic.
  • the basic principle of the hardware design is: when the car is in the process of running, the power switch K2 is closed, and the voltage stabilizing circuit 20 stabilizes the 12V power supply of the battery to a 5V power supply to supply power to the subsequent circuit.
  • the S1 signal appears low, the switching transistor Q1 is turned on, and the subsequent clock circuit 40 is powered.
  • the turn signal switch mechanical switch K1
  • the clock circuit 40 satisfies the condition of oscillation, starts self-oscillation, and supplies a pulse switch signal having an amplitude of 5V to the chip in the drive circuit 50 through the transistor Q5, and the drive chip has the same
  • the frequency drives the turn signal load circuit 60 to achieve the effect of blinking of the turn signal.
  • the working conditions of the circuit are as follows: 1. The power supply switch K2 is closed (the vehicle is in the process of running); 2. The system fails (S1 is low level); 3. The mechanical switch K1 (hazard warning light switch) is closed. The three conditions are met at the same time to make the circuit work, and the turn signal (hazard warning light) flashes.
  • the above embodiment details the different configurations of the turn signal driving circuit.
  • the present invention includes, but is not limited to, the configurations listed in the above embodiments, any of which is based on the configuration provided by the above embodiments.
  • the contents of the transformation are all within the scope of protection of the present invention. Those skilled in the art can make the same according to the content of the above embodiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electronic Switches (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

本发明提供了一种转向灯跛行驱动电路，所述转向灯跛行驱动电路包括供电电路、开关电路、时钟电路和驱动电路，其中：所述供电电路向所述开关电路和所述驱动电路供电；所述开关电路包括第一晶体管，系统故障信号使所述第一晶体管导通，以使所述供电电路通过所述第一晶体管向所述时钟电路供电；所述时钟电路包括第一充电电路和第二充电电路，所述第一充电电路和所述第二充电电路交替充放电，以使所述时钟电路向所述驱动电路提供时钟信号；所述驱动电路根据所述时钟信号驱动转向灯闪烁。

Description

转向灯跛行驱动电路 技术领域
本发明涉及车辆控制器技术领域，特别涉及一种转向灯跛行驱动电路。
背景技术
车身控制器(BCM)的跛行回家功能是指当车身控制器发生严重的系统故障时仍能保持某些基本功能，这些功能包括近光灯、雨刮和刹车灯等重要功能。如图1所示，由于这些功能的控制信号来源于主控芯片70，而主控芯片70是主要的系统失效和随机失效源，所以硬件的设计方法就是设计旁路电路(故障信号S1输入与门的一端，机械开关K1闭合时，将短路到地的信号输入到与门另一端，与门导通并给驱动芯片50发送开关信号)，开关信号在主控芯片70失效时直接跨过主控芯片70而控制驱动芯片50输出，驱动芯片50驱动负载电路60。
随着汽车安全性的提高，越来越多的功能被列入跛行回家功能中。例如危险报警灯功能，车身控制器在发生严重系统故障时，转向灯(危险报警灯)仍能保持其基本功能，以一定的频率进行闪烁。由于要求在车身控制器在发生严重系统故障时转向灯(危险报警灯)以一定的频率闪烁，这样硬件设计上就有两个技术要点：车身控制器发生严重系统故障时，相关的后备(跛行功能)电路才能被使能，正常工作时该部分后备(跛行功能)电路不工作；由于车身控制器发生严重的系统故障时，系统时钟失控，以一定频率闪烁就需要后备(跛行功能)电路中包含可以独立工作的时钟源电路；这两个技术要点是传统车身控制器设计上没有被设计的。
发明内容
本发明的目的在于提供一种转向灯跛行驱动电路，以解决现有的车身控制器缺少转向灯跛行驱动功能的问题。
为解决上述技术问题，本发明提供一种转向灯跛行驱动电路，所述转向灯跛行驱动电路包括供电电路、开关电路、时钟电路和驱动电路，其中：
所述供电电路向所述开关电路和所述驱动电路供电；
所述开关电路包括第一晶体管，所述第一晶体管可在接收到一系统故障信号时导通，以使所述供电电路通过所述第一晶体管向所述时钟电路供电；
所述时钟电路包括第一充电电路和第二充电电路，所述第一充电电路和所述第二充电电路交替充放电，以使所述时钟电路向所述驱动电路提供时钟信号；
所述驱动电路根据所述时钟信号驱动转向灯闪烁。
可选的，在所述的转向灯跛行驱动电路中，所述供电电路包括直流电压源和供电开关，所述供电开关连接在所述直流电压源和所述开关电路之间，所述直流电压源连接所述驱动电路。
可选的，在所述的转向灯跛行驱动电路中，所述转向灯跛行驱动电路还包括稳压电路，所述稳压电路包括第一电阻、第一电容、第二晶体管和稳压管，所述第二晶体管为NPN型三极管，其中：
所述第二晶体管的基极连接所述稳压管的负极，所述第二晶体管的集电极连接所述供电电路，所述第二晶体管的发射极连接所述开关电路；
所述稳压管的正极接地；
所述第一电阻的一端连接所述第二晶体管的基极，另一端连接所述供电电路；
所述第一电容的一端连接所述第二晶体管的基极，另一端接地；
所述稳压管的稳压电压为5V～6V。
可选的，在所述的转向灯跛行驱动电路中，所述开关电路还包括第二电阻、第三电阻和第二电容，所述第一晶体管为PNP型三极管，其中：
所述第一晶体管的基极连接所述第三电阻的一端，所述第三电阻的另一端输入所述系统故障信号，所述第一晶体管的集电极连接所述时钟电路，所述第一晶体管的发射极连接所述第二晶体管的发射极；
所述第二电阻的一端连接所述第一晶体管的基极，另一端连接所述第一晶体管的集电极；
所述第二电容的一端连接所述第一晶体管的集电极，另一端接地。
可选的，在所述的转向灯跛行驱动电路中，所述时钟电路包括第五电阻、第六电阻、第七电阻、第八电阻、第九电阻、第三电容、第四电容、第三晶体管、第四晶体管和第五晶体管，其中：
所述第三晶体管、所述第四晶体管和所述第五晶体管均为NPN型三极管；
所述第五电阻、所述第六电阻、所述第七电阻、所述第八电阻和所述第九电阻的一端均连接所述第一晶体管的集电极；
所述第五电阻的另一端连接所述第三晶体管的集电极；
所述第六电阻的另一端连接所述第四晶体管的基极；
所述第七电阻的另一端连接所述第三晶体管的基极；
所述第八电阻的另一端连接所述第四晶体管的集电极；
所述第九电阻的另一端连接所述第五晶体管的集电极；
所述第三电容一端连接所述第三晶体管的集电极，另一端连接所述第四晶体管的基极；
所述第四电容一端连接所述第四晶体管的集电极，另一端连接所述第三晶体管的基极；
所述第三晶体管、所述第四晶体管和所述第五晶体管的发射极接地；
所述第五晶体管的基极连接所述第四晶体管的集电极，所述第五晶体管的集电极连接所述驱动电路。
可选的，在所述的转向灯跛行驱动电路中，所述第三电容的容值为C3＝f*R6/0.7，所述第四电容的容值为C4＝f*R7/0.7，其中，C3为第三电容的容值，C4为第四电容的容值，R6为第六电阻的阻值，R7为第七电阻的阻值，f为所述时钟电路的振荡频率。
可选的，在所述的转向灯跛行驱动电路中，所述转向灯跛行驱动电路还包括机械开关和第四二极管，所述机械开关的一端接地，另一端连接所述第四二极管的负极，所述第四二极管的正极连接所述第三晶体管和所述第四晶体管的发射极。
可选的，在所述的转向灯跛行驱动电路中，所述转向灯跛行驱动电路还包括第一二极管和第二二极管，其中：
所述第一二极管的正极连接所述供电电路，所述第一二极管的负极连接所述驱动电路；
所述第二二极管的正极连接所述供电电路，所述第二二极管的负极连接所述开关电路。
可选的，在所述的转向灯跛行驱动电路中，所述转向灯为卤素灯或发光二极管。
可选的，在所述的转向灯跛行驱动电路中，所述驱动电路包括高边驱动芯片或低边驱动芯片。
在本发明提供的转向灯跛行驱动电路中，通过系统故障信号使第一晶体管导通，以使供电电路通过所述第一晶体管向时钟电路供电，第一充电电路和第二充电电路交替充放电，以使时钟电路向驱动电路提供时钟信号，实现了在车身控制器发生严重系统故障时，仍能保证转向灯(危险报警灯)的有效工作，提升了车身控制器的安全性能，电路以较简单的元器件搭建完成，硬件成本很低，与车身控制器上其他的跛行功能电路相搭配，具有较好的兼容性。
进一步的，驱动电路包括的驱动芯片可以是高边驱动芯片(电源端驱动)，也可以是低边驱动芯片(地端驱动)，时钟电路中产生的时钟信号的频率可以通过更改电路中的电阻电容(第三电容和第四电容)的参数进行配置，负载电路可以是卤素灯负载，也可以是发光二极管(LED)，也可以是其他负载形式。
附图说明
图1是现有的转向灯跛行驱动电路示意图；
图2是本发明一实施例转向灯跛行驱动电路示意图；
图中所示：10-供电电路；20-稳压电路；30-开关电路；40-时钟电路；50-驱动电路；60-转向灯或负载电路；70-主控芯片。
具体实施方式
以下结合附图和具体实施例对本发明提出的转向灯跛行驱动电路作进一步详细说明。根据下面说明和权利要求书，本发明的优点和特征将更清楚。需说明的是，附图均采用非常简化的形式且均使用非精准的比例，仅用以方便、明晰地辅助说明本发明实施例的目的。
本发明的核心思想在于提供一种转向灯跛行驱动电路，以解决现有的车身控制器缺少转向灯跛行驱动功能的问题。
为实现上述思想，本发明提供了一种转向灯跛行驱动电路，所述转向灯跛行驱动电路包括供电电路、开关电路、时钟电路和驱动电路，其中：所述供电电路向所述开关电路和所述驱动电路供电；所述开关电路包括第一晶体管，系统故障信号使所述第一晶体管导通，以使所述供电电路通过所述第一晶体管向所述时钟电路供电；所述时钟电路包括第一充电电路和第二充电电路，所述第一充电电路和所述第二充电电路交替充放电，以使所述时钟电路向所述驱动电路提供时钟信号；所述驱动电路根据所述时钟信号驱动转向灯闪烁。
本实施例提供一种转向灯跛行驱动电路，如图2所示，所述转向灯跛行驱动电路包括供电电路10、开关电路30、时钟电路40和驱动电路50，其中：所述供电电路10向所述开关电路30和所述驱动电路50供电；所述开关电路30包括第一晶体管Q1，系统故障信号S1使所述第一晶体管Q1导通，以使所述供电电路10通过所述第一晶体管Q1向所述时钟电路40供电；所述时钟电路40包括第一充电电路和第二充电电路，所述第一充电电路和所述第二充电电路交替充放电，以使所述时钟电路40向所述驱动电路50提供时钟信号S3；所述驱动电路50根据所述时钟信号S3驱动转向灯60闪烁。
具体的，在所述的转向灯跛行驱动电路中，所述供电电路10包括直流电压源V1和供电开关K2，所述供电开关K2连接在所述直流电压源V1和所述开关电路30之间，所述直流电压源V1连接所述驱动电路50，直流电压源V1向所述开关电路30和所述驱动电路50供电，供电开关K2用于控制转向灯跛行驱动电路的使能。所述转向灯跛行驱动电路还包括第一二极管D1和第二二极管D2，其中：所述第一二极管D1的正极连接所述供电电路10，具体 的连接直流电压源V1，所述第一二极管D1的负极连接所述驱动电路50；所述第二二极管D2的正极连接所述供电电路10，具体的连接供电开关K2，所述第二二极管D2的负极连接所述开关电路30或稳压电路20；第一二极管D1和第二二极管D2的作用为保护供电电路10，防止负载端大电流冲击。
进一步的，在所述的转向灯跛行驱动电路中，所述转向灯跛行驱动电路还包括稳压电路20，所述稳压电路20包括第一电阻R1、第一电容C1、第二晶体管Q2和稳压管D3，所述第二晶体管Q2为NPN型三极管，其中：所述第二晶体管Q2的基极连接所述稳压管D3的负极，所述第二晶体管Q2的集电极连接所述供电电路10，具体的通过第二二极管D2连接供电开关K2，所述第二晶体管Q2的发射极连接所述开关电路30；所述稳压管D3的正极接地；所述第一电阻R1的一端连接所述第二晶体管Q2的基极，另一端连接所述供电电路10，具体的通过第二二极管D2连接供电开关K2；所述第一电容C1的一端连接所述第二晶体管Q2的基极，另一端接地；所述稳压管D3的稳压电压为5V～6V。直流电压源V1的输出电压为12V左右，通过D2到达R1的一端时，经过D1的导通压降，保持的电压大于11V，由于D3的稳压电压为5V～6V，优选的为5.7V，则D3的正极，即R1的另一端电压为5.7V，则Q2导通，Q2的发射极电压低于基极0.7V，大约为5V，提供至开关电路30。
具体的，在所述的转向灯跛行驱动电路中，所述开关电路30还包括第二电阻R2、第三电阻R3和第二电容C2，所述第一晶体管Q1为PNP型三极管，其中：所述第一晶体管Q1的基极连接所述第三电阻R3的一端，所述第三电阻R3的另一端输入所述系统故障信号S1，所述第一晶体管Q1的集电极连接所述时钟电路40，所述第一晶体管Q1的发射极连接所述第二晶体管Q2的发射极；所述第二电阻R2的一端连接所述第一晶体管Q1的基极，另一端连接所述第一晶体管Q1的集电极；所述第二电容C2的一端连接所述第一晶体管Q1的集电极，另一端接地，用于滤波。当系统故障信号S1为低电平时，Q1导通，Q2发射极输出的5V左右电压经过Q1提供至时钟电路40。
更进一步的，在所述的转向灯跛行驱动电路中，所述时钟电路40包括第五电阻R5、第六电阻R6、第七电阻R7、第八电阻R8、第九电阻R9、第三 电容C3、第四电容C4、第三晶体管Q3、第四晶体管Q4和第五晶体管Q5，其中：第三晶体管Q3、第四晶体管Q4和第五晶体管Q5均为NPN型三极管；第五电阻R5、第六电阻R6、第七电阻R7、第八电阻R8和第九电阻R9的一端均连接所述第一晶体管Q1的集电极；所述第五电阻R5的另一端连接所述第三晶体管Q3的集电极；所述第六电阻R6的另一端连接所述第四晶体管Q4的基极；所述第七电阻R7的另一端连接所述第三晶体管Q3的基极；所述第八电阻R8的另一端连接所述第四晶体管Q4的集电极；所述第九电阻R9的另一端连接所述第五晶体管Q5的集电极；所述第三电容C3一端连接所述第三晶体管Q3的集电极，另一端连接所述第四晶体管Q4的基极；所述第四电容C4一端连接所述第四晶体管Q4的集电极，另一端连接所述第三晶体管Q3的基极；所述第三晶体管Q3、所述第四晶体管Q4和所述第五晶体管Q5的发射极接地；所述第五晶体管Q5的基极连接所述第四晶体管Q4的集电极，所述第五晶体管Q5的集电极连接所述驱动电路50。
由两个非门(三极管Q3和Q4)和C3和C4构成正反馈闭合环路。三极管Q3的集电极接在Q4的基极，Q4的集电极又接在Q3的基极。当电路通电时(开关电路输出5V并且机械开关闭合)，通过基极电阻R6，R7同时向两个三极管Q3，Q4提供基极偏置电流，使Q3和Q4进入放大状态。由于Q3和Q4存在个体差异，假设Q3导通快一些，则Q3的集电极电压下降的会快一些，这个微小的差异将被Q4放大并反馈到Q3的基极，再经过Q3的放大，形成连锁反应，使Q3迅速饱和，Q4截止。从而使Q4的集电极电压为5V，Q3的集电极为0V。Q3饱和后相当于一个接通的开关，电容C3通过它放电，C4通过它充电。随着C3的放电，由于有5V正电源的作用，Q4的基极电压逐渐升高，当Q4的基极电压达到0.7V后，Q4开始导通进入放大区，电路又会出现连锁反应，Q4迅速饱和，Q3迅速截止，此时Q4的集电极电压变为0V，Q3的集电极电压变为5V。如此周而复始，形成振荡。由上可知，通过改变C3和C4的大小，可以改变电容的充放电时间，从而改变振荡频率。振荡频率f＝0.7/R6*C3＝0.7/R7*C4，其中，C3为第三电容的容值，C4为第四电容的容值，R6为第六电阻的阻值，R7为第七电阻的阻值。因此，选取第三电 容和第四电容时，所述第三电容的容值为C3＝f*R6/0.7，所述第四电容的容值为C4＝f*R7/0.7，其中，C3为第三电容的容值，C4为第四电容的容值，R6为第六电阻的阻值，R7为第七电阻的阻值，f为所述时钟电路的振荡频率。
另外，所述转向灯跛行驱动电路还包括机械开关K1和第四二极管D4，所述机械开关K1的一端接地，另一端连接所述第四二极管D4的负极，所述第四二极管D4的正极连接所述第三晶体管Q3和所述第四晶体管Q4的发射极，当K1闭合时，Q3和Q4的发射极接地，时钟电路才被使能。最后，所述转向灯60为卤素灯或发光二极管。所述驱动电路50包括高边驱动芯片或低边驱动芯片。
在本发明提供的转向灯跛行驱动电路中，通过系统故障信号使第一晶体管导通，以使供电电路通过所述第一晶体管向时钟电路供电，第一充电电路和第二充电电路交替充放电，以使时钟电路向驱动电路提供时钟信号，实现了在车身控制器发生严重系统故障时，仍能保证转向灯(危险报警灯)的有效工作，提升了车身控制器的安全性能，电路以较简单的元器件搭建完成，硬件成本很低，与车身控制器上其他的跛行功能电路相搭配，具有较好的兼容性。
进一步的，驱动电路包括的驱动芯片可以是高边驱动芯片(电源端驱动)，也可以是低边驱动芯片(地端驱动)，时钟电路中产生的时钟信号的频率可以通过更改电路中的电阻电容(第三电容和第四电容)的参数进行配置，负载电路可以是卤素灯负载，也可以是发光二极管(LED)，也可以是其他负载形式。
其中，供电电路位于BCM外部，为整车的电源；稳压电路位于BCM内部，功能是将12V电压稳压为5V左右的逻辑电平；开关电路位于BCM内部，功能是将故障信号做电平转换，当系统有故障时，S1信号为低电平信号，三极管Q1导通，5V电源将给时钟电路供电；时钟电路位于BCM内部，功能是通过自激振荡将5V恒定电源转换为5V到0V跳变的脉冲电平。驱动电路位于BCM内部，将驱动信号转换为功率信号进行对外输出，以驱动电气负载。负载电路(即转向灯)位于BCM外部，通常转向灯(危险报警灯)为卤素灯 或LED；机械开关K1位于BCM外部，当转向开关被按下时，表现为短路到地的特性。
该硬件设计的基本原理为：当车在行驶过程中时，供电开关K2闭合，稳压电路20将电池的12V电源稳定为5V电源给后续电路供电。当BCM遇到严重的系统故障时，S1信号表现为低电平，开关三极管Q1被打开，后续时钟电路40被供电。当转向灯开关(机械开关K1)闭合时，时钟电路40满足振荡的条件，开始自激振荡，通过三极管Q5为驱动电路50中的芯片提供幅值为5V的脉冲开关信号，驱动芯片以相同的频率驱动转向灯负载电路60，从而达到转向灯闪烁的效果。
该电路工作的条件是：一、供电开关K2闭合(车在行驶过程中)；二、系统失效(S1为低电平)；三、机械开关K1(危险报警灯开关)闭合。三个条件同时满足才能使电路工作，转向灯(危险报警灯)闪烁。
综上，上述实施例对转向灯跛行驱动电路的不同构型进行了详细说明，当然，本发明包括但不局限于上述实施中所列举的构型，任何在上述实施例提供的构型基础上进行变换的内容，均属于本发明所保护的范围。本领域技术人员可以根据上述实施例的内容举一反三。
上述描述仅是对本发明较佳实施例的描述，并非对本发明范围的任何限定，本发明领域的普通技术人员根据上述揭示内容做的任何变更、修饰，均属于权利要求书的保护范围。

Claims (10)

  1. 一种转向灯跛行驱动电路，包括供电电路、开关电路、时钟电路和驱动电路，其中：
    所述供电电路向所述开关电路和所述驱动电路供电；
    所述开关电路包括第一晶体管，所述第一晶体管可在接收到一系统故障信号时导通，以使所述供电电路通过所述第一晶体管向所述时钟电路供电；
    所述时钟电路包括第一充电电路和第二充电电路，所述第一充电电路和所述第二充电电路交替充放电，以使所述时钟电路向所述驱动电路提供时钟信号；
    所述驱动电路根据所述时钟信号驱动转向灯闪烁。
  2. 如权利要求1所述的转向灯跛行驱动电路，其特征在于，所述供电电路包括直流电压源和供电开关，所述供电开关连接在所述直流电压源和所述开关电路之间，所述直流电压源连接所述驱动电路。
  3. 如权利要求1所述的转向灯跛行驱动电路，其特征在于，还包括稳压电路，所述稳压电路包括第一电阻、第一电容、第二晶体管和稳压管，所述第二晶体管为NPN型三极管，其中：
    所述第二晶体管的基极连接所述稳压管的负极，所述第二晶体管的集电极连接所述供电电路，所述第二晶体管的发射极连接所述开关电路；
    所述稳压管的正极接地；
    所述第一电阻的一端连接所述第二晶体管的基极，另一端连接所述供电电路；
    所述第一电容的一端连接所述第二晶体管的基极，另一端接地；
    所述稳压管的稳压电压为5V～6V。
  4. 如权利要求3所述的转向灯跛行驱动电路，其特征在于，所述开关电路还包括第二电阻、第三电阻和第二电容，所述第一晶体管为PNP型三极管，其中：
    所述第一晶体管的基极连接所述第三电阻的一端，所述第三电阻的另一 端输入所述系统故障信号，所述第一晶体管的集电极连接所述时钟电路，所述第一晶体管的发射极连接所述第二晶体管的发射极；
    所述第二电阻的一端连接所述第一晶体管的基极，另一端连接所述第一晶体管的集电极；
    所述第二电容的一端连接所述第一晶体管的集电极，另一端接地。
  5. 如权利要求4所述的转向灯跛行驱动电路，其特征在于，所述时钟电路包括第五电阻、第六电阻、第七电阻、第八电阻、第九电阻、第三电容、第四电容、第三晶体管、第四晶体管和第五晶体管，其中：
    所述第三晶体管、所述第四晶体管和所述第五晶体管均为NPN型三极管；
    所述第五电阻、所述第六电阻、所述第七电阻、所述第八电阻和所述第九电阻的一端均连接所述第一晶体管的集电极；
    所述第五电阻的另一端连接所述第三晶体管的集电极；
    所述第六电阻的另一端连接所述第四晶体管的基极；
    所述第七电阻的另一端连接所述第三晶体管的基极；
    所述第八电阻的另一端连接所述第四晶体管的集电极；
    所述第九电阻的另一端连接所述第五晶体管的集电极；
    所述第三电容一端连接所述第三晶体管的集电极，另一端连接所述第四晶体管的基极；
    所述第四电容一端连接所述第四晶体管的集电极，另一端连接所述第三晶体管的基极；
    所述第三晶体管、所述第四晶体管和所述第五晶体管的发射极接地；
    所述第五晶体管的基极连接所述第四晶体管的集电极，所述第五晶体管的集电极连接所述驱动电路。
  6. 如权利要求5所述的转向灯跛行驱动电路，其特征在于，所述第三电容的容值为C3＝f*R6/0.7，所述第四电容的容值为C4＝f*R7/0.7，其中，C3为第三电容的容值，C4为第四电容的容值，R6为第六电阻的阻值，R7为第七电阻的阻值，f为所述时钟电路的振荡频率。
  7. 如权利要求5所述的转向灯跛行驱动电路，其特征在于，所述转向灯 跛行驱动电路还包括机械开关和第四二极管，所述机械开关的一端接地，另一端连接所述第四二极管的负极，所述第四二极管的正极连接所述第三晶体管和所述第四晶体管的发射极。
  8. 如权利要求1所述的转向灯跛行驱动电路，其特征在于，所述转向灯跛行驱动电路还包括第一二极管和第二二极管，其中：
    所述第一二极管的正极连接所述供电电路，所述第一二极管的负极连接所述驱动电路；
    所述第二二极管的正极连接所述供电电路，所述第二二极管的负极连接所述开关电路。
  9. 如权利要求1所述的转向灯跛行驱动电路，其特征在于，所述转向灯为卤素灯或发光二极管。
  10. 如权利要求1所述的转向灯跛行驱动电路，其特征在于，所述驱动电路包括高边驱动芯片或低边驱动芯片。
PCT/CN2018/116521 2017-12-29 2018-11-20 转向灯跛行驱动电路 WO2019128544A1 (zh)

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