Reverse inquiry type multifunctional atmosphere lamp control circuit and method

Abstract

The invention discloses a reverse inquiry type multifunctional atmosphere lamp control circuit and method, and the circuit comprises a master controller and a slave controller, the master controller is used for receiving a control instruction of a vehicle and guiding the lightening and extinguishing states of an LED lamp, and the slave controller is used for directly driving the lightening and extinguishing of the LED lamp. The main controller is composed of a power supply voltage stabilizing module, a current sampling module, a first voltage micro-change module 1, a first voltage micro-change module 2 and a single-chip microcomputer module. The invention relates to the technical field of automotive electronics, and has the beneficial effects that the power line is used for transmitting signals, external wire harnesses of the controller and transceiver chips of a CAN bus or an LIN bus in the controller are saved, the cost is greatly saved, transceivers of the CAN bus or the LIN bus in the controller are reduced, and the size of the controller is reduced.

Description

Technical Field

[0001] The present invention relates to the field of automotive electronics, and in particular to a reverse interrogation type multifunctional atmosphere lamp control circuit and method. Background Art

[0002] The existing vehicle ambient light control system basically uses the CAN bus or LIN bus communication method. Adding CAN or LIN communication harnesses to the connector is costly and inconvenient to wire.

[0003] Both the master controller and the slave controller need to add a CAN bus or LIN bus transceiver chip, which is costly and increases the size of the controller.

[0004] As the number of data lines increases, more chip interfaces, PCB traces, and physical signal lines are required. This not only increases hardware costs but can also increase the size and weight of the device, hindering portability and space utilization. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and to design a reverse interrogation type multifunctional atmosphere lamp control circuit and method.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is a reverse inquiry type multifunctional atmosphere lamp control circuit and method, including a main controller and a slave controller, characterized in that the main controller is used to receive control instructions of the vehicle and dominate the lighting and extinguishing status of the LED lamp, and the slave controller is used to directly drive the lighting and extinguishing of the LED lamp. The main controller is composed of a power supply voltage stabilization module, a current sampling module, a first voltage micro-change module, a first voltage micro-change module and a single-chip microcomputer module.

[0007] The power supply voltage stabilization module is mainly composed of a power supply chip U1, resistors R2 and R4 that match the output voltage, and a filter capacitor C1. The resistors R2 and R4 are connected in series and the middle is connected to the FB pin of U1.

[0008] The current sampling module is composed of a sampling resistor R1 and a current amplifier U2A, wherein the + and - pins of the amplifier are connected to both ends of the sampling resistor R1, and the output end of the amplifier is connected to the single chip microcomputer.

[0009] The first voltage micro-change module and the first voltage micro-change module are composed of two parts, a first module and a second module. The first module is composed of a diode D1, a MOS tube Q1, a voltage regulator diode D3, resistors R5, R7, R9 and a transistor Q3, wherein the diode D1 is connected to the sampling resistor R1, the S and D poles of the MOS tube Q1 are connected to both ends of the diode D1, D3 is connected to the S and G poles of the MOS tube Q1, the resistor R5 is connected between the G pole of the MOS tube Q1 and the C pole of the transistor Q3, the resistor R9 is connected between the B pole and the E pole of the transistor Q3, and the resistor R7 is connected between the single-chip computer U3 and the B pole of the transistor Q3. The circuit structure of the second module is the same as that of the first module.

[0010] The slave controller is composed of a current micro-variable module, a voltage acquisition module, a power supply filter module, a single chip computer module and a first LED driving module.

[0011] The current micro-variable module consists of resistors R11, R14 and R18 and a transistor Q5, wherein one end of the resistor R11 is connected to the power input end and the other end is connected to the C pole of the transistor Q5, the resistor R18 is connected between the B pole and the E pole of the transistor Q5, and the resistor R14 is connected between the B pole of the transistor Q5 and the microcontroller U4.

[0012] The voltage sampling module is composed of a resistor R12 and a resistor R13, wherein the resistor R12 is connected between the power input terminal and the resistor R13, the resistor R13 is connected between the resistor R12 and GND, and the connection point of the resistors R12 and R13 is connected to the microcontroller U4.

[0013] The power filter module is composed of an inductor L1 and a capacitor C2, wherein one end of the inductor L1 is connected to the power input end, and the other end is connected to the capacitor C2 and is also connected to the positive electrode of the LED lamp of the LED driver module.

[0014] The LED driver module is composed of several LED drivers. The second LED driver module is composed of a light-emitting diode LED1, a transistor Q6, and resistors R15 and R19. The positive pole of the light-emitting diode LED1 is connected to the inductor L1, and the negative pole is connected to the C pole of the transistor Q6. The resistor R19 is connected between the B pole and the E pole of the transistor Q6. One end of the resistor R15 is connected to the B pole of the transistor Q6, and the other end is connected to the microcontroller U4.

[0015] A reverse interrogation multifunctional atmosphere lamp control method, wherein the LED lamp water lighting control method comprises the following steps:

[0016] Step S1: The main controller turns off MOS transistors Q1 and Q2 for a time TMS, and then turns on MOS transistor Q2 to send the start code.

[0017] Step S2: The slave controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5 to transmit the inquiry code.

[0018] Step S3: The main controller delays for a certain time (to adjust the LED lighting interval), then turns on MOS tubes Q1 and Q2 for a time TMA, and then turns off MOS tube Q2. This sends a response code to light up the LED.

[0019] Step S4: The slave controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5. The query code is sent again to inquire whether the second LED is lit.

[0020] Step S5: Repeat steps 3 and 4 until the last LED is queried and then send the end code;

[0021] The LED lamp water extinguishing control method includes the following steps:

[0022] Step Sa: The main controller turns on MOS tubes Q1 and Q2, turns off for a period of time TMS, and then turns off MOS tube Q2. This implements the sending of the start code.

[0023] Step Sb: The slave controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5 to transmit the inquiry code.

[0024] Step Sc: The main controller delays for a certain time (to adjust the LED off time interval), then turns off MOS tubes Q1 and Q2, turns on for time TMA, and then turns on MOS tube Q2. This sends a response code to turn off the LED;

[0025] Step Sd: The controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5. The query code is sent again to inquire whether the second LED is lit.

[0026] Step Se: Repeat steps c and d until the last LED is queried, and then send the end code.

[0027] A reverse interrogation multifunctional atmosphere lamp control circuit and method are manufactured using the technical solution of the present invention. The present invention uses a power line to transmit signals, saving the external wiring harness of the controller and the CAN bus or LIN bus transceiver chip in the controller, greatly saving costs, reducing the CAN bus or LIN bus transceiver in the controller, and reducing the size of the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a principle block diagram of a main controller of a reverse interrogation type multifunctional atmosphere lamp control circuit and method according to the present invention;

[0029] Figure 2This is a schematic diagram of the main controller of a reverse interrogation type multifunctional atmosphere lamp control circuit and method according to the present invention;

[0030] Figure 3 This is a principle block diagram of a slave controller of a reverse interrogation type multifunctional atmosphere lamp control circuit and method according to the present invention;

[0031] Figure 4 This is a schematic diagram of a slave controller of a reverse interrogation type multifunctional atmosphere lamp control circuit and method according to the present invention;

[0032] Figure 5 This is a flow chart of a control method of a reverse interrogation type multifunctional atmosphere lamp control circuit and method according to the present invention;

[0033] Figure 6 This is a schematic diagram of the main controller signal instructions of a reverse interrogation type multifunctional atmosphere lamp control circuit and method according to the present invention;

[0034] Figure 7 It is a schematic diagram of a slave controller signal instruction of a reverse inquiry type multifunctional atmosphere lamp control circuit and method described in the present invention. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below with reference to the accompanying drawings. Figure 1-7 As shown, a reverse inquiry multifunctional atmosphere lamp control circuit and method comprises a master controller and a slave controller. The master controller is used to receive control instructions from the vehicle and control the lighting and extinguishing status of the LED lamp. The slave controller is used to directly drive the lighting and extinguishing of the LED lamp.

[0036] The main controller consists of a power supply voltage stabilization module, a current sampling module, a first voltage micro-change module, a second voltage micro-change module and a single-chip computer module.

[0037] Power supply voltage regulator module: provides stable power supply for the slave controller.

[0038] Current sampling module: It can collect the current flowing through the sampling resistor and output it to the microcontroller module in the form of voltage.

[0039] The voltage micro-variation module consists of a first module and a second module, and is used to generate positive and negative micro-variable voltages.

[0040] The single chip microcomputer module is the core control unit.

[0041] The power supply voltage regulator module is mainly composed of a power supply chip U1, resistors R2 and R4 that match the output voltage, and a filter capacitor C1. Resistors R2 and R4 are connected in series, with the middle connected to the FB pin of U1.

[0042] The current sampling module is composed of a sampling resistor R1 and a current amplifier U2A, wherein the + and - pins of the amplifier are connected to both ends of the sampling resistor R1, and the output end of the amplifier is connected to the single chip microcomputer.

[0043] The first and second voltage micro-variation modules are composed of two parts: a first module and a second module. The first module consists of a diode D1, a MOS transistor Q1, a voltage stabilizing diode D3, resistors R5, R7, R9, and a transistor Q3. Diode D1 is connected to sampling resistor R1, the S and D terminals of MOS transistor Q1 are connected to diode D1, and D3 is connected to the S and G terminals of MOS transistor Q1. Resistor R5 is connected between the G terminal of MOS transistor Q1 and the C terminal of transistor Q3, resistor R9 is connected between the B and E terminals of transistor Q3, and resistor R7 is connected between microcontroller U3 and the B terminal of transistor Q3. The circuit structure of the second module is the same as that of the first module.

[0044] The slave controller consists of a current micro-change module, a voltage acquisition module, a power supply filter module, a single chip computer module and a first LED driving module.

[0045] The current micro-variable module is composed of resistors R11, R14 and R18 and a transistor Q5, wherein one end of the resistor R11 is connected to the power input terminal and the other end is connected to the C pole of the transistor Q5, the resistor R18 is connected between the B pole and the E pole of the transistor Q5, and the resistor R14 is connected between the B pole of the transistor Q5 and the microcontroller U4.

[0046] The voltage sampling module is composed of a resistor R12 and a resistor R13, wherein the resistor R12 is connected between the power input terminal and the resistor R13, the resistor R13 is connected between the resistor R12 and GND, and the connection point of the resistors R12 and R13 is connected to the microcontroller U4.

[0047] The power filter module is composed of an inductor L1 and a capacitor C2, wherein one end of the inductor L1 is connected to the power input end, and the other end is connected to the capacitor C2 and is also connected to the positive electrode of the LED lamp of the LED driver module.

[0048] The LED driver module is composed of several LED drivers. The second LED driver module is composed of a light-emitting diode LED1, a transistor Q6, and resistors R15 and R19. The positive electrode of the light-emitting diode LED1 is connected to the inductor L1, and the negative electrode is connected to the C terminal of the transistor Q6. The resistor R19 is connected between the B and E terminals of the transistor Q6. One end of the resistor R15 is connected to the B terminal of the transistor Q6, and the other end is connected to the microcontroller U4.

[0049] It should be noted that: the generation of voltage micro-change signals: when the master controller normally supplies power to the slave controller, the microcontroller controls transistors Q3 and Q4, turning Q1 off and Q2 on. At this time, the output voltage of VLED is V0. When Q1 and Q2 are both on, the output voltage of VLED is V0 + the voltage drop of diode D2 (about 0.7V), and the voltage of VLED is VOUT = V0+0.7. When Q1 and Q2 are both off, the output voltage of VLED is V0 - the voltage drop of diode D1 (about 0.7V), and the voltage of VLED is VOUT = V0-0.7. The slave controller receives instructions based on the voltage changes of the master controller through the voltage acquisition module, such as Figure 5 shown.

[0050] The present invention uses only two power lines and adopts a voltage micro-variation mode and a current micro-variation mode to carry out communication between the host and the slave.

[0051] The voltage micro-variation mode of the present invention has two modes: positive voltage variation and negative voltage variation.

[0052] The control method of the present invention realizes the lighting and extinguishing of the LED lamp in a reverse inquiry manner of the slave.

[0053] The control protocol of the present invention determines the function of the voltage and current by the time of slight change.

[0054] The sending logic of the voltage and current slight changes of the present invention is sent when the LED lamp is stable.

[0055] Generation of current slight change signal: The single chip microcomputer controls the opening and closing of transistor Q5. During normal operation, the single chip microcomputer controls transistor Q5 to be closed. When the slave controller needs to inquire whether the current LED light is on, it turns on transistor Q5. At this time, the input current of the slave controller will increase IZ = VLED / R11. The main controller receives instructions based on the change of the slave controller current through the current sampling module, such as Figure 6 shown

[0056] In this embodiment, the LED lamp water lighting control method includes the following steps:

[0057] Step S1: The main controller turns off MOS transistors Q1 and Q2 for a time TMS, and then turns on MOS transistor Q2 to send the start code.

[0058] Step S2: The slave controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5 to transmit the inquiry code.

[0059] Step S3: The main controller delays for a certain time (to adjust the LED lighting interval), then turns on MOS tubes Q1 and Q2 for a time TMA, and then turns off MOS tube Q2. This sends a response code to light up the LED.

[0060] Step S4: The slave controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5. The query code is sent again to inquire whether the second LED is lit.

[0061] Step S5: Repeat steps 3 and 4 until the last LED is queried and then send the end code;

[0062] The LED lamp water extinguishing control method includes the following steps:

[0063] Step Sa: The main controller turns on MOS tubes Q1 and Q2, turns off for a period of time TMS, and then turns off MOS tube Q2. This implements the sending of the start code.

[0064] Step Sb: The slave controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5 to transmit the inquiry code.

[0065] Step Sc: The main controller delays for a certain time (to adjust the LED off time interval), then turns off MOS tubes Q1 and Q2, turns on for time TMA, and then turns on MOS tube Q2. This sends a response code to turn off the LED;

[0066] Step Sd: The controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5. The query code is sent again to inquire whether the second LED is lit.

[0067] Step Se: Repeat steps c and d until the last LED is queried, and then send the end code.

[0068] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Any changes that may be made to certain parts thereof by those skilled in the art all reflect the principles of the present invention and fall within the scope of protection of the present invention.

Claims

1. A reverse interrogation multifunctional atmosphere light control circuit, comprising a master controller and a slave controller, characterized in that: The main controller is used to receive control instructions from the vehicle and control the lighting and extinguishing status of the LED lights. The slave controller is used to directly drive the lighting and extinguishing of the LED lights. The main controller consists of a power supply voltage stabilization module, a current sampling module, a first voltage micro-change module, a first voltage micro-change module and a single-chip microcomputer module.

2. The reverse interrogation multifunctional atmosphere light control circuit according to claim 1, characterized in that: The power supply voltage stabilization module is mainly composed of a power supply chip U1, resistors R2 and R4 that match the output voltage, and a filter capacitor C1. The resistors R2 and R4 are connected in series and the middle is connected to the FB pin of U1.

3. The reverse interrogation multifunctional atmosphere light control circuit according to claim 1, characterized in that: The current sampling module is composed of a sampling resistor R1 and a current amplifier U2A, wherein the + and - pins of the amplifier are connected to both ends of the sampling resistor R1, and the output end of the amplifier is connected to the single chip microcomputer.

4. The reverse interrogation multifunctional atmosphere light control circuit according to claim 1, characterized in that: The first voltage micro-change module and the first voltage micro-change module are composed of two parts, a first module and a second module. The first module is composed of a diode D1, a MOS tube Q1, a voltage regulator diode D3, resistors R5, R7, R9 and a transistor Q3, wherein the diode D1 is connected to the sampling resistor R1, the S and D poles of the MOS tube Q1 are connected to both ends of the diode D1, D3 is connected to the S and G poles of the MOS tube Q1, the resistor R5 is connected between the G pole of the MOS tube Q1 and the C pole of the transistor Q3, the resistor R9 is connected between the B pole and the E pole of the transistor Q3, and the resistor R7 is connected between the single-chip computer U3 and the B pole of the transistor Q3. The circuit structure of the second module is the same as that of the first module.

5. The reverse interrogation multifunctional atmosphere lamp control circuit according to claim 1, characterized in that: The slave controller is composed of a current micro-variable module, a voltage acquisition module, a power supply filter module, a single chip computer module and a first LED driving module.

6. The reverse interrogation multifunctional atmosphere lamp control circuit and method according to claim 1, characterized in that: The current micro-variable module consists of resistors R11, R14 and R18 and a transistor Q5, wherein one end of the resistor R11 is connected to the power input end and the other end is connected to the C pole of the transistor Q5, the resistor R18 is connected between the B pole and the E pole of the transistor Q5, and the resistor R14 is connected between the B pole of the transistor Q5 and the microcontroller U4.

7. The reverse interrogation multifunctional atmosphere light control circuit according to claim 1, characterized in that: The voltage sampling module is composed of a resistor R12 and a resistor R13, wherein the resistor R12 is connected between the power input terminal and the resistor R13, the resistor R13 is connected between the resistor R12 and GND, and the connection point of the resistors R12 and R13 is connected to the microcontroller U4.

8. The reverse interrogation multifunctional atmosphere lamp control circuit and method according to claim 1, characterized in that: The power filter module is composed of an inductor L1 and a capacitor C2, wherein one end of the inductor L1 is connected to the power input end, and the other end is connected to the capacitor C2 and is also connected to the positive electrode of the LED lamp of the LED driver module.

9. The reverse interrogation multifunctional atmosphere light control circuit according to claim 1, characterized in that: The LED driver module is composed of several LED drivers. The second LED driver module is composed of a light-emitting diode LED1, a transistor Q6, and resistors R15 and R19. The positive pole of the light-emitting diode LED1 is connected to the inductor L1, and the negative pole is connected to the C pole of the transistor Q6. The resistor R19 is connected between the B pole and the E pole of the transistor Q6. One end of the resistor R15 is connected to the B pole of the transistor Q6, and the other end is connected to the microcontroller U4.

10. A reverse interrogation multifunctional atmosphere lamp control method, characterized in that: The LED lamp water lighting control method includes the following steps: Step S1: The main controller turns off MOS tubes Q1 and Q2 for a time TMS, and then turns on MOS tube Q2 to send the start code. Step S2: The slave controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5 to send the inquiry code. Step S3: The main controller delays for a certain time (used to adjust the LED lighting time interval), then turns on MOS tubes Q1 and Q2 for a time TMA, and then turns off MOS tube Q2 to send a response code to light up the LED; Step S4: The slave controller turns on transistor Q5 for a time period TSA, then turns off transistor Q5 and sends the inquiry code again to inquire whether the second LED is on. Step S5: Repeat steps 3 and 4 until the last LED is queried and then send the end code; The LED lamp water extinguishing control method includes the following steps: Step Sa: The main controller turns on MOS tubes Q1 and Q2, turns off for a period of time TMS, and then turns off MOS tube Q2 to send the start code. Step Sb: The slave controller turns on transistor Q5 for a time period TSA, and then turns off transistor Q5 to transmit the inquiry code. Step Sc: The main controller delays for a certain time (used to adjust the LED off time interval), then turns off MOS tubes Q1 and Q2, turns on for time TMA, and then turns on MOS tube Q2 to send a response code and turn off the LED; Step Sd: The slave controller turns on transistor Q5 for a time period TSA, then turns off transistor Q5 and sends the inquiry code again to inquire whether the second LED is lit. Step Se: Repeat steps c and d until the last LED is queried, and then send the end code.

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