Vertical screen motorcycle instrument

Abstract

The utility model discloses a motorcycle instrument with a vertical screen, which relates to the field of motorcycle instruments and comprises a thin film liquid crystal display screen, pins of the thin film liquid crystal display screen are respectively connected with pins at one ends of a plurality of row resistors, and pins at the other ends of the row resistors are correspondingly connected with pins on a main processor. Pins on the thin film liquid crystal display screen are correspondingly connected with pins on the chip, and the main processor is connected with the electronic control and power management module. The instrument is placed in a vertical screen, so that the size of the instrument can be larger, information displayed on the instrument is clearer, meanwhile, a main power supply is designed to supply power, a triode is conducted through a signal of a chip, a PMOS tube in a main power supply circuit is conducted, an electric signal with lower voltage is used for controlling conduction and interruption of a circuit with higher voltage, and the circuit is more stable and reliable. And the main power supply circuit is high in response speed and large in bearing current, so that the stability of instrument display power supply is ensured, the voltage reduction loss electric energy is less, and the response speed is high.

Description

Technical Field

[0001] The utility model relates to the field of motorcycle instruments, and particularly relates to a vertical-screen motorcycle instrument with a TFT display screen. Background Technique

[0002] Motorcycles are one of the favorite means of transportation for many adventure lovers. Although they are prohibited or strictly restricted in most big cities in China, they are still an important means of transportation in some rural and underdeveloped areas. Compared with cars, motorcycles are cheaper and more convenient to travel. Compared with bicycles or electric bicycles, motorcycles are faster.

[0003] With the progress of technology, motorcycle instruments have evolved from the initial mechanical instruments that can only display the current vehicle speed, remaining fuel quantity, and driving mileage to electronic instruments that can collect data through sensors and display important information such as water temperature, tire pressure, and oil pressure on the instrument after the data is collected by the sensors and input into the central processor for processing.

[0004] At present, many motorcycle instruments use LCD instruments. However, due to the limited space at the motorcycle handlebar, there are restrictions on the installation size of the instrument. As more and more motorcycle information can be displayed on the instrument, it is difficult to ensure that the information on the instrument can be clearly displayed on a small instrument screen. Many of the information displayed on the instrument is just a flashing icon and becomes a decoration.

[0005] Due to the limited space at the motorcycle handlebar position, when the motorcycle instrument is installed horizontally, the size of the liquid crystal display screen is limited by the space size. For example, in the "FPC liquid crystal screen motorcycle instrument" disclosed in the publication number CN220701264U, the instrument is placed horizontally, so the size is limited to a certain extent. The information on the instrument will be relatively small and difficult to see clearly, and the human-computer interaction is poor. Content of the Utility Model

[0006] In view of the deficiencies of the prior art, the present utility model provides a vertical-screen motorcycle instrument. By placing the LCD liquid crystal display vertically, a larger-sized instrument can be installed on the motorcycle, enabling the information displayed on it to be clearer and the font to be larger, which is beneficial for motorcycle drivers to better understand the vehicle condition. A further object of the present utility model is how to better display for a larger-sized screen. The present utility model designs the core board power supply circuit and the main circuit power supply, enabling it to better step down the input higher voltage through a step-down DCDC conversion chip, and can output a larger current to meet the power requirements of the instrument, and the output voltage is more stable. A still further object of the present utility model is that the main circuit power supply circuit further stabilizes the relatively low voltage output by the step-down DCDC conversion chip, ensuring that the main processor operates under stable voltage conditions, and the voltage received by the LCD liquid crystal display is very stable, avoiding problems such as slow response speed of the main processor and stroboscopic phenomena of the LCD liquid crystal display due to unstable voltage, and improving the usage experience of motorcycle riders during riding.

[0007] The present utility model achieves the above technical objects through the following technical means.

[0008] A vertical-screen motorcycle instrument includes a TFT-LCD (thin film liquid crystal display). The R0 to R7, G0 to G7, and B0 to B7 pins of the TFT-LCD are respectively connected to the pins at one end of several row resistors RN. The pins at the other end of the row resistors RN are correspondingly connected to the CPU_D0 to CPU_D9, LCD_D10 to LCD_D17, and LCD18 to LCD21 pins on the main processor. The BTBYB, DCK, HS, VS, and DE pins on the TFT-LCD are also correspondingly connected to the pins on the chip. The main processor is connected to the electronic control and power management module.

[0009] Each part of the power supply circuit in the power management module is connected to the socket chip through a bus.

[0010] Further, the electronic control and power management module further includes core board circuit power supply. The 12V voltage is input to the VIN and EN pins of the DCDC step-down conversion chip, and then output from the SW pin to the asynchronous rectification circuit, and finally output as 5V to supply power to the SOC core board circuit.

[0011] Further, the power supply circuit includes main power supply. The main power supply circuit is located on the core board. By controlling the output of 1 or 0 from the MCU_OUT1 pin of the main processor to control the conduction or disconnection of the triode Q7, thereby controlling the conduction or disconnection of the PMOS tube Q6, and finally controlling the power supply of the main power supply.

[0012] Further, in the lower half of the main power supply, Q7 is an NPN-type triode. The MCU_OUT1 pin is first connected in series with one end of the resistor R73. The other end of the resistor R73 is connected to one end after the parallel connection of one end of the resistor 1R9, one end of the capacitor C015, and the base of the triode Q7. The other end of the resistor 1R9 is connected in parallel with the other end of the capacitor C015 and the emitter of the triode Q7 to ground. The collector of the triode Q7 is connected to the upper half of the main power supply.

[0013] Further, in the upper half of the main power supply, a 5V voltage is input to VCC. The input voltage leads to one end after the parallel connection of one end of C13, the source of the PMOS transistor Q6, and one end of the resistor R75. The other end of the resistor R75, the other end of the capacitor C13, and the gate of the PMOS transistor Q6 are connected in parallel. After the parallel connection, it is connected to one end of the resistor R118. The other end of the resistor R118 is connected to the lower half of the main power supply.

[0014] Further, in the upper half of the main power supply, the source of the PMOS transistor Q6 is connected in parallel with the N pole of the diode D39. The drain of the PMOS transistor Q6 is connected in parallel with the P pole of the diode D39. The drain of the PMOS transistor Q6 is also connected in parallel with one end of the capacitor C72 and the capacitor C15. The other ends of the capacitor C72 and the capacitor C15 are connected in parallel to ground. The voltage is finally output from D5V.

[0015] Further, the MCU_OUT1 pin outputs an enable signal to the base of the triode Q7, and the collector and emitter of the triode Q7 are turned on, generating a negative potential between the gate and source of the PMOS transistor Q6. At this time, the source and drain of the PMOS transistor Q6 are turned on, and the D5V output voltage supplies power to other components.

[0016] Further, the main processor is also connected to the WIFI and Bluetooth modules.

[0017] The present utility model has the following gain effects:

[0018] When the instrument is placed vertically, the size of the instrument can be made larger, so that the information displayed on the instrument is clearer and more distinct. At the same time, by designing the main power supply, the signal of the chip turns on the triode Q7, and the PMOS transistor Q6 in the main power supply circuit is turned on, realizing the on-off control of a circuit with a higher voltage by an electrical signal with a lower voltage. Moreover, the main power supply circuit has a fast response speed and can withstand a large current, ensuring the stability of the instrument display power supply. The core board power supply circuit is responsible for reducing the input 12V voltage to 5V and then transmitting power to the chip, the LCD screen of the instrument, and the main power supply circuit. And the power loss during voltage reduction is small, and the response speed is fast. Description of the Drawings

[0019] Figure 1Schematic diagram of the connection between the LCD and the chip of the present utility model.

[0020] Figure 2 Schematic diagram of the connection of the main power supply circuit of the present utility model.

[0021] Figure 3 Schematic diagram of the connection of the power supply circuit of the core board of the present utility model. Specific embodiments

[0022] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present utility model is not limited thereto.

[0023] Embodiment 1:

[0024] As Figure 1 shown, a vertical screen motorcycle instrument, the TFT-LCD liquid crystal display screen of the vertical screen motorcycle instrument is connected to the pins of the main processor in the circuit. There are 40 pins in total for the TFT-LCD liquid crystal display screen used in this embodiment. Among them, the VDD pin is connected to a 3.3V voltage, the GND pin at position 3 is grounded, and a capacitor C33 is connected between the VDD pin and the GND pin at position 3. Capacitor C33 is a non-polar capacitor. One end of capacitor C33 is connected to the power supply 3.3VS, and the other end is connected to GND.

[0025] The capacitor C33 here can stabilize the voltage input to the VDD pin and play a role in filtering and noise reduction. When the voltage suddenly drops, the voltage of capacitor C33 will be greater than the input voltage, and the capacitor will discharge to keep the voltage near the previously input voltage value. When the input voltage is greater than the capacitor voltage, the capacitor will charge to reduce the current size and protect the LCD liquid crystal display screen. Connecting a capacitor in parallel between the VDD pin of the input voltage and the grounded GND pin will also cause some delay in the startup of the LCD liquid crystal display screen. When powered on, the capacitor needs to be fully charged before the LCD liquid crystal display screen will turn on, rather than the LCD liquid crystal display screen turning on immediately when powered on, so there is a certain delay.

[0026] The NC pins at position 1, the pins at position 2 (also NC), and the NC pins at position 35 on the LCD liquid crystal display are all in a floating state. The RO, R1, R2, and R3 pins of the LCD liquid crystal display are connected to the R0, R1, R2, and R3 pins of the resistor network RN4 with the same pin names. The pin names of the other end of the resistor network RN4 are different, and there is a corresponding relationship between the pin names of the other end and the pin names of the end connected to the LCD liquid crystal display. Among them, the LCD_R0 pin corresponds to the R0 pin, the LCD_R1 pin corresponds to the R1 pin, the LCD_R2 pin corresponds to the R2 pin, and the LCD_R3 pin corresponds to the R3 pin. The resistor network RN4 is connected to the pins of the central processing unit. Among them, the CPU_D0 pin of the central processing unit corresponds to the LCD_R0 pin, the CPU_D1 pin corresponds to the LCD_R1 pin, the CPU_D2 pin corresponds to the LCD_R2 pin, and the CPU_D3 pin corresponds to the LCD_R3 pin. The pins with the same names on the resistor network RN4 are connected to the pins with the same names led out on the central processing unit in a one-to-one correspondence.

[0027] The R4, R5, R6, and R7 pins of the LCD liquid crystal display are connected to the R4, R5, R6, and R7 pins of the resistor network RN5 with the same pin names. The pin names of the other end of the resistor network RN5 are different, and there is a corresponding relationship between the pin names of the other end and the pin names of the end connected to the LCD liquid crystal display. Among them, the LCD_R4 pin corresponds to the R4 pin, the LCD_R5 pin corresponds to the R5 pin, the LCD_R6 pin corresponds to the R6 pin, and the LCD_R7 pin corresponds to the R7 pin. The resistor network RN5 is connected to the pins of the central processing unit. Among them, the CPU_D4 pin of the central processing unit corresponds to the LCD_R4 pin, the CPU_D5 pin corresponds to the LCD_R5 pin, the CPU_D6 pin corresponds to the LCD_R6 pin, and the CPU_D7 pin corresponds to the LCD_R7 pin. The pins with the same names on the resistor network RN5 are connected to the pins with the same names led out on the central processing unit in a one-to-one correspondence.

[0028] The GO, G1, G2, and G3 pins of the LCD liquid crystal display are correspondingly connected to the G0, G1, G2, and G3 pins on the resistor network RN6 with the same pin names. The pin names of the other end of the resistor network RN6 are different, and there is a corresponding relationship between the pin names of the other end and the pin names of the end connected to the LCD liquid crystal display. Among them, the LCD_G0 pin corresponds to the G0 pin, the LCD_G1 pin corresponds to the G1 pin, the LCD_G2 pin corresponds to the G2 pin, and the LCD_G3 pin corresponds to the G3 pin. The resistor network RN4 is connected to the pins of the central processing unit. Among them, the CPU_D8 pin of the central processing unit corresponds to the LCD_G0 pin, the CPU_D9 pin corresponds to the LCD_G1 pin, the LCD_D10 pin corresponds to the LCD_G2 pin, and the LCD_D11 pin corresponds to the LCD_G3 pin. The pins with the same names on the resistor network RN6 are correspondingly connected to the pins with the same names led out on the central processing unit one by one.

[0029] The G4, G5, G6, and G7 pins of the LCD liquid crystal display are correspondingly connected to the G4, G5, G6, and G7 pins on the resistor network RN7 with the same pin names. The pin names of the other end of the resistor network RN7 are different, and there is a corresponding relationship between the pin names of the other end and the pin names of the end connected to the LCD liquid crystal display. Among them, the LCD_G4 pin corresponds to the G4 pin, the LCD_G5 pin corresponds to the G5 pin, the LCD_G6 pin corresponds to the G6 pin, and the LCD_G7 pin corresponds to the G7 pin. The resistor network RN7 is connected to the pins of the central processing unit. Among them, the LCD_D12 pin of the central processing unit corresponds to the LCD_G4 pin, the LCD_D13 pin corresponds to the LCD_G5 pin, the LCD_D14 pin corresponds to the LCD_G6 pin, and the LCD_D15 pin corresponds to the LCD_G7 pin. The pins with the same names on the resistor network RN6 are correspondingly connected to the pins with the same names led out on the central processing unit one by one.

[0030] The BO, B1, B2, and B3 pins of the LCD liquid crystal display, and the B0, B1, B2, and B3 pins on the resistor network RN8 are connected with corresponding pins of the same name. The pin names of the other end of the resistor network RN8 are different, and there is a corresponding relationship between the pin names of the other end and the pin names of the end connected to the LCD liquid crystal display. Among them, the LCD_B0 pin corresponds to the B0 pin, the LCD_B1 pin corresponds to the B1 pin, the LCD_B2 pin corresponds to the B2 pin, and the LCD_B3 pin corresponds to the B3 pin. The resistor network RN8 is connected to the pins of the central processing unit. Among them, the LCD_D16 pin of the central processing unit corresponds to the LCD_B0 pin, the LCD_D17 pin corresponds to the LCD_B1 pin, the LCD_D18 pin corresponds to the LCD_B2 pin, and the LCD_D19 pin corresponds to the LCD_B3 pin. The pins with the same name on the resistor network RN8 are connected one by one with the pins with the same name led out on the central processing unit.

[0031] The B4, B5, B6, and B7 pins of the LCD liquid crystal display, and the B4, B5, B6, and B7 pins on the resistor network RN9 are connected with corresponding pins of the same name. The pin names of the other end of the resistor network RN9 are different, and there is a corresponding relationship between the pin names of the other end and the pin names of the end connected to the LCD liquid crystal display. Among them, the LCD_B4 pin corresponds to the B4 pin, the LCD_B5 pin corresponds to the B5 pin, the LCD_B6 pin corresponds to the B6 pin, and the LCD_B7 pin corresponds to the B7 pin. The pins of the resistor network RN9 are connected to the pins of the central processing unit. Among them, the LCD_D20 pin of the central processing unit corresponds to the LCD_B4 pin, the LCD_D21 pin corresponds to the LCD_B5 pin, the LCD_D22 pin corresponds to the LCD_B6 pin, and the LCD_D23 pin corresponds to the LCD_B7 pin. The pins with the same name on the resistor network RN8 are connected one by one with the pins with the same name led out on the central processing unit.

[0032] Among them, the R0 to R7 pins receive the red signal of the image, the G0 to G7 pins receive the green signal of the image, and the B0 to B7 pins receive the blue signal of the image. After the R0 to R7 pins, G0 to G7 pins, and B0 to B7 pins are connected to the main processor, the 29th pin GND is grounded, and the 30th pin CLKIN is an external clock pin, which is connected to the clock pin on the main processor to receive the clock oscillation signal of the main processor, enabling the LCD liquid crystal display to work properly.

[0033] The pin name of the pin led out by HSD of pin 32 on the LCD liquid crystal display screen is the HS pin, and its function is to receive the horizontal synchronization signal transmitted by the main processor to the LCD display screen; the pin name of the pin led out by VSD of pin 33 on the LCD liquid crystal display screen is the VS pin, and its function is to receive the vertical synchronization signal transmitted by the main processor to the LCD display screen; the pin name of the pin led out by DEN of pin 34 on the LCD liquid crystal display screen is the DE pin, and its function is to receive the data enable signal transmitted by the main processor to the LCD display screen; the pin name of the pin led out by STBYB of pin 31 on the LCD liquid crystal display screen is the STBYB pin, and its function is to receive the standby signal transmitted by the main processor to the LCD display screen, and it is responsible for controlling whether the LCD display screen enters the standby state and can be used to save electric energy.

[0034] Among them, except for the CLKIN pin of pin 30, one end of the resistor RN10 has four pins, which are the STBYB pin, HS pin, VS pin, and DE pin from top to bottom. These four pins are respectively connected to the STBYB pin, HS pin, VS pin, and DE pin led out by STBYB, HSD, VSD, and DEN on the LCD liquid crystal display screen according to the relationship of the same name. The other ends of the STBYB pin, HS pin, VS pin, and DE pin on the resistor PN10 are the LCD_STBYB pin, LCD_HS pin, LCD_VS pin, and LCD_DE pin respectively.

[0035] The pin that leads out LCD_STBYB on the main processor is the ITU1_D7 pin. Therefore, the LCD_STBYB pin of the resistor R10 is connected to the ITU1_D7 pin of the main processor. The LCD_HS pin corresponds to the LCD_HS pin on the main processor, and the LCD_VS pin corresponds to the LCD_HS pin on the main processor. The pins with the same name on the resistor RN10 are connected to the pins with the same name led out on the central processor one by one.

[0036] Different from other pins on the LCD that are connected to the main processor to receive and transmit signals, the DCK pin is led out from the CLKIN pin on the LCD. Among them, the DCK pin is in series with the resistor R32, and at the same time, the DCK pin is also in parallel with one end of the capacitor C65, and the other end of the capacitor C65 is grounded. After passing through the resistor R32, the DCK pin is connected to the LCD_CLK pin of the main processor on the main processor.

[0037] The 36th pin on the LCD liquid crystal display screen is the GND pin responsible for grounding, and the 37th, 38th, 39th, and 40th pins are connected to the screen backlight power supply circuit, which will not be elaborated here.

[0038] Pins 41 and 42 on the LCD are both GND pins, and they are grounded in parallel after being connected in parallel.

[0039] Embodiment 2:

[0040] As Figure 2 shown, a vertical screen instrument for a motorcycle includes the main processor and the LCD in Embodiment 1. A main power supply circuit is designed on the PCB board of the instrument. This main power supply circuit can be divided into upper and lower parts. The lower part is responsible for receiving signals to control the on-off of the triode Q7, and the on-off of the triode Q7 can in turn affect the on-off of the upper part of the circuit. The upper part of the circuit conducts the circuit through the PMOS transistor, thereby outputting the voltage of VCC from D5V. This circuit can control a circuit with a higher voltage through a lower voltage. Among them, the triode Q7 plays the role of a control switch, and the upper part of the circuit is controlled by the PMOS transistor, with a fast response speed, capable of passing a large current, and small energy loss. Using it to supply power to the main power supply can ensure a fast response speed, fast startup, low delay, stability of the control circuit, and reliable control. It can ensure that the voltage output to the LCD and the main processor through the buck circuit from D5V is stable and has small fluctuations.

[0041] It can make the display of the vertical screen instrument more stable, and it is not easy to generate screen flickering or problems such as slow response speed of the processor and reduced screen refresh rate due to too low voltage caused by voltage fluctuations.

[0042] Next, introduce how this circuit realizes controlling the on-off of the circuit through the input signal of the pin.

[0043] In the lower part, a signal is input through the MCU_OUT1 input pin. The MCU_OUT1 pin is connected in series with one end of the resistor R73. The other end of the resistor R73 is connected to one end formed by the parallel connection of the resistor 1R9, the capacitor C015, and one end of the base of the triode Q7. The other ends of the resistor 1R9 and the capacitor C015 and the emitter of the triode Q7 are grounded in parallel after being connected in parallel. The resistor R73 plays the role of current limiting and voltage dividing. The voltage across the resistor 1R9 is the same as the voltage at the base of the triode Q7. The capacitor C015 plays the role of stabilizing the signal and delaying here.

[0044] When there is a voltage fluctuation, the capacitor C015 can ensure that when the signal output from the MCU_OUT1 pin fluctuates briefly and causes the voltage to be lower than the conduction voltage between the base and emitter of the triode Q7, the capacitor C015 can maintain the voltage above the conduction voltage between the base and emitter of the triode Q7 for a certain period of time, keeping the triode still conducting. And when the signal starts to be input, the capacitor C015 enters the charging state. At this time, the voltage at the triode Q7 does not jump directly from 0 to the conduction voltage. Instead, when the capacitor C015 starts to charge, as the number of charges in the capacitor C015 increases continuously, the voltage of the capacitor C015 gradually rises. As explained above, the voltage at the base of the triode Q7 is the same as the voltage of the capacitor C015. Therefore, the voltage at the base of the triode Q7 needs to rise slowly. Only when the capacitor is charged to a certain voltage, higher than the conduction voltage, will the triode conduct.

[0045] Therefore, the capacitance of the capacitor is a factor affecting the conduction speed of the triode Q7. The larger the capacitance of the capacitor, the more charges are needed to be fully charged, the slower the voltage rises, the slower the conduction speed of the triode Q7 is affected, and the higher the delay. Correspondingly, the larger the capacitance, the stronger the signal stability ability, and the more capable it is of resisting signal fluctuations in the circuit. While the smaller the capacitance of the capacitor, the fewer charges are needed to be fully charged, the faster the voltage rises, the faster the conduction speed of the triode Q7 is affected, and the lower the delay. Correspondingly, the smaller the capacitance, the weaker the signal stability ability, and the weaker the ability to resist signal fluctuations in the circuit.

[0046] The collector of the triode Q7 is connected to one end of the resistor R118 in the upper half of the circuit. The input of the upper half of the circuit is VCC. VCC is first connected to one end after being paralleled with one end of the resistor R75, the capacitor C13, and the source of the PMOS transistor Q6. The other end after paralleling the other ends of the resistor R75, the capacitor C13, and the gate of the PMOS transistor Q6 is connected to the other end of the resistor R118.

[0047] In the upper half of the circuit, the source and drain of the PMOS transistor Q6 are also paralleled with the diode D39. The source of the PMOS transistor Q6 is paralleled with the N pole of the diode D39, and the drain of the PMOS transistor Q6 is paralleled with the P pole of the diode D39. When the drain of the PMOS transistor is paralleled with the P pole of the diode D39, it is also paralleled with one end of the capacitor C72, one end of the capacitor C15, D5V, and the test point Ts3.

[0048] The capacitor C13 here not only has a time-delay effect as described above, but also plays an important role in shunting. In the circuit here, the PMOS transistor Q6 serves as a switching device. When the PMOS transistor serves as a switching device, it has a relatively fast response speed, and the resistance when conducting can be extremely low, reaching 50 mΩ. For the PMOS transistor Q6 to conduct, there needs to be a voltage difference between the gate and the source, and it will conduct only when the gate voltage is less than the source voltage. Since the resistance of the PMOS transistor Q6 is very small when it conducts, when the voltage jumps and the conduction speed is too fast during the conduction of the PMOS transistor, the current passing through the PMOS transistor Q6 may be very large, even burning through the PMOS transistor. The capacitor C13, because it is in parallel with the PMOS transistor Q6, can divert a part of the current. And since the capacitor C13 is in parallel with the gate of the PMOS transistor Q6, when the triode Q7 is not conducting, the voltages at the gate and the source of the PMOS transistor Q6 are the same, which means the voltages across the capacitor C13 connected in parallel to the gate and the source of the PMOS transistor Q6 at both ends are the same.

[0049] To enable the source and the drain of the PMOS transistor Q6 to conduct, a high-level signal needs to be sent from the chip to the base of the triode Q7 to make the collector and the emitter of the triode Q7 conduct, so that a negative potential can be generated between the gate and the source of the PMOS transistor Q6, enabling the source and the drain of the PMOS transistor Q6 to conduct, and the D5V output voltage supplies power to other components.

[0050] When the triode Q7 conducts, the voltage at the capacitor C13 is pulled down at this time, and the gate voltage also drops. The source voltage of the PMOS transistor Q6 is higher than the gate, generating a voltage difference that can conduct. At this time, due to the charging of the capacitor C13, the speed of increasing the voltage difference between the source and the gate of the PMOS transistor is slowed down, making the current passing through the PMOS transistor Q6 increase slowly, and there will not be an instantaneously large current, so that the instantaneous power at the PMOS transistor is greater than its maximum power and burns out the PMOS transistor. And connecting two capacitors in parallel behind the drain of the PMOS transistor Q6 is to stabilize the circuit and reduce voltage fluctuations.

[0051] Embodiment Three:

[0052] As Figure 3 shown, it includes the main processor and the LCD in Embodiment One and the main power supply circuit on the PCB board in Embodiment Two. The core board of the instrument needs to reduce the externally input voltage of 12V to 5V for output. The step-down DCDC conversion chip can convert the 12V DC input voltage into a 5V DC output voltage. The model of the step-down DCDC conversion chip used in this embodiment is SCT2630.

[0053] The external 12V B voltage is input to one end of capacitor 1C7 and a bypass parallel to capacitor 1C7. The VIN pin of the step-down DCDC conversion chip and one end of capacitor 1C8 are in parallel with another bypass. One end of resistor 1R8 is first connected in series on the other bypass. The other end of resistor 1R8 is in parallel with resistor 1R7 and the EN pin of the step-down DCDC conversion chip. The VIN and EN pins on the step-down DCDC conversion chip are responsible for accessing the input 12V voltage. The RT / CLK pin on the step-down DCDC conversion chip is connected in series with one end of resistor 1R6. The other ends of capacitor 1C7, capacitor 1C8, resistor 1R7, and resistor 1R6 are connected in parallel and then grounded.

[0054] The BOOT pin of the step-down DCDC conversion chip is connected in series with one end of capacitor 1C11. The SW pin of the step-down DCDC conversion chip is responsible for outputting the reduced 5V voltage. The voltage output from the SW pin leads to one end formed by the parallel connection of the N pole of zener diode D102, one end of inductor L101, and the other end of capacitor 1C11. The zener diode D102 can stabilize the voltage so that the voltage of the circuit does not change significantly under a certain change in current. Capacitor 1C11 and inductor L101 are responsible for providing a delay function to prevent the inrush current when the output voltage ramps up. It has an external loop compensation function to provide optimized loop stability or flexibility response of the loop.

[0055] The other end of inductor L101 is in parallel with capacitor 1C12, capacitor 1C13, capacitor 1C14, capacitor 1C15, one end of resistor 1R3, and capacitor 1C34, and the output voltage leads to VCC. The two GND pins on the step-down DCDC conversion chip are connected in parallel and then grounded in parallel with the P pole of zener diode D102 and the other ends of 1C12, capacitor 1C13, capacitor 1C14, and capacitor 1C15. At the same time, it is connected to one end of the parallel-connected resistors 1R2 and 1R4. The other ends of resistors 1R2, 1R4, resistor 1R3, and capacitor 1C34 are connected in parallel and then connected to the FB pin. The COMP pin of the step-down DCDC conversion chip is connected to an external parallel circuit. There are two branches on the external parallel circuit. One branch has resistor 1R5 connected in series. The other end of resistor 1R5 is connected in series with one end of capacitor 1C9. The other branch has a capacitor 1C10 connected in series. The other ends of capacitor 1C9 and capacitor 1C10 are connected in parallel and then grounded.

[0056] Powering the core board circuit through the design of the step-down DCDC conversion chip can achieve a wider input voltage range and a larger output current. For a larger vertical screen meter, it can provide higher power to meet the power consumption needs of the meter and the TFT-LCD liquid crystal display, and can make the information display on the meter clearer and more stable.

[0057] By placing the LCD liquid crystal display vertically, this instrument can be installed on a motorcycle with a larger size, enabling the information displayed on it to be clearer and the font to be larger, which is beneficial for motorcycle riders to better understand the vehicle condition. Regarding how to better display on a larger screen, this utility model designs the power supply circuit for the core board and the main circuit power supply, enabling it to better step down the input higher voltage through a step-down DCDC conversion chip, and can output a larger current to meet the power requirements of the instrument, and the output voltage is more stable. The main circuit power supply circuit further stabilizes the lower voltage output by the step-down DCDC conversion chip, ensuring that the main processor operates under stable voltage conditions, and the voltage received by the LCD liquid crystal display is very stable, avoiding problems such as slow response speed of the main processor and stroboscopic phenomena of the LCD liquid crystal display due to unstable voltage, and improving the usage experience of motorcycle riders during riding.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A vertical screen motorcycle instrument, comprising a thin film liquid crystal display, characterized in that: The R0 to R7, G0 to G7 and B0 to B7 pins of the thin film liquid crystal display are respectively connected to the pins at one end of a plurality of resistors RN, and the pins at the other end of the resistors RN are correspondingly connected to the CPU_D0 to CPU_D9, LCD_D10 to LCD_D17 and LCD18 to LCD21 pins on the main processor, the BTBYB, DCK, HS, VS and DE pins on the display are also correspondingly connected to the pins on the chip, and the main processor is connected to the electronic control and power management module; Each power circuit in the power management module is connected to the socket chip via a bus.

2. The vertical screen motorcycle instrument according to claim 1, characterized in that: The electronic control and power management module also includes a core board circuit power supply. The 12V voltage is input to the VIN and EN pins of the DCDC step-down conversion chip, and then output from the SW pin to the asynchronous rectification circuit, and finally output to 5V to power the SOC core board circuit.

3. The vertical screen motorcycle instrument according to claim 1, characterized in that: The power supply circuit includes a main power supply, which is located on the core board. The main power supply circuit controls the on or off of the transistor Q7 by controlling the MCU_OUT1 pin of the main processor to output 1 or 0, thereby controlling the on or off of the PMOS tube Q6, and finally controlling the power supply of the main power supply.

4. The vertical screen motorcycle instrument according to claim 3, characterized in that: In the lower part of the main power supply, Q7 is an NPN transistor, the MCU_OUT1 pin is first connected in series with one end of the resistor R73, the other end of the resistor R73 is connected to one end of the resistor 1R9, one end of the capacitor C015 and the base of the transistor Q7 in parallel, the other end of the resistor 1R9, the other end of the capacitor C015 and the emitter of the transistor Q7 are connected to the ground in parallel, and the collector of the transistor Q7 is connected to the upper part of the main power supply.

5. The vertical screen motorcycle instrument according to claim 3 or 4, characterized in that: In the upper part of the main power supply, VCC inputs a 5V voltage, and the input voltage is connected to one end of one end of C13, the source of the PMOS tube Q6 and one end of the resistor R75 in parallel, and the other end of the resistor R75 is connected in parallel with the other end of the capacitor C13 and the gate of the PMOS tube Q6, and then connected to one end of the resistor R118 after parallel connection, and the other end of the resistor R118 is connected to the lower part of the main power supply.

6. The vertical screen motorcycle instrument according to claim 3 or 4, characterized in that: In the upper part of the main power supply, the source of the PMOS tube Q6 is connected in parallel with the N pole of the diode D39, the drain of the PMOS tube Q6 is connected in parallel with the P pole of the diode D39, the drain of the PMOS tube Q6 is connected in parallel with the capacitor C72 and one end of the capacitor C15, and the other ends of the capacitor C72 and the capacitor C15 are connected in parallel to the ground.

7. The vertical screen motorcycle instrument according to claim 3 or 4, characterized in that: The MCU_OUT1 pin outputs an enable signal to the base of the transistor Q7, and the collector and emitter of the transistor Q7 are turned on.

8. The vertical screen motorcycle instrument according to claim 1, 2, 3 or 4, characterized in that: The main processor is also connected with WIFI and Bluetooth modules.

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