A smart digital instrument circuit for electric vehicles

Abstract

This utility model relates to the field of electric vehicle instruments, specifically to an intelligent digital instrument circuit for electric vehicles, including a power conversion module and a backlight module. The power conversion module includes a conversion chip. The positive terminal of the power supply is connected to the conversion chip after passing through a first filter circuit. The conversion chip outputs a first voltage after passing through a voltage regulation circuit and a second filter circuit. The output terminal of the second filter circuit is also connected to a voltage divider circuit. The output terminal of the voltage divider circuit outputs a second voltage after passing through a third filter circuit. The power conversion module is used to step down the voltage and output power to the main chip and driver chip. The voltage regulation circuit is used to adjust the voltage and outputs the first voltage after stabilization by the second filter circuit. The output terminal of the second filter circuit is connected to a voltage divider circuit, which further divides and reduces the voltage before outputting the second voltage. That is, the circuit of this application can output a first voltage and a second voltage with different voltage values, thereby reducing energy loss and extending battery life.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle instruments, specifically to an intelligent digital instrument circuit for electric vehicles. Background Technology

[0002] Existing smart digital instrument circuits for electric bicycles integrate information such as vehicle speed, SOC, navigation, OTA, and anti-theft onto a single high-resolution color screen. They are connected in real time to the battery, mobile phone, and cloud via Bluetooth. They offer advantages such as accurate readings, rich interaction, remote upgrades, and improved safety and range. However, compared to traditional instruments, they consume more energy and have a shorter battery life. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an intelligent digital instrument circuit for electric vehicles, so as to solve the problems of high energy consumption and short service life of existing intelligent digital instrument circuits for electric vehicles.

[0004] To achieve the above objectives, this utility model provides an intelligent digital instrument circuit for electric bicycles, including a power conversion module and a backlight module. The power conversion module includes a conversion chip. The positive terminal of the power supply is connected to the conversion chip after passing through a first filter circuit. The conversion chip outputs a first voltage after passing through a voltage regulation circuit and a second filter circuit. The output terminal of the second filter circuit is also connected to a voltage divider circuit. The output terminal of the voltage divider circuit outputs a second voltage after passing through a third filter circuit.

[0005] The principle and beneficial effects of the technical solution are as follows: the power conversion module is used to step down and output power to the main chip and driver chip; the backlight module is used to receive signals and reduce the brightness of the instrument; the conversion chip in the power conversion module is used to optimize power conversion efficiency and reduce standby power consumption; the first filter circuit is used to make the input power voltage smoother and more stable; the voltage regulation circuit is used to adjust the voltage and output a first voltage after stabilization by the second filter circuit; the output terminal of the second filter circuit is connected to the voltage divider circuit, which further divides and reduces the voltage; and then outputs a second voltage after stabilization by the third filter circuit. That is, the circuit of this application can output the first voltage and the second voltage with different voltage values. By providing different voltages to power different components individually, energy loss is reduced and battery life is extended.

[0006] In a preferred embodiment of this utility model, the conversion chip is a chip with the model number SD4943.

[0007] Beneficial effects: SD4943 has a low cost, which can effectively reduce production costs.

[0008] In a preferred embodiment of this utility model, a first diode D1 is further provided between the positive terminal of the power supply and the conversion chip. The input terminal of the first diode D1 is connected to the positive terminal of the power supply, and the output terminal is connected to the four DRAIN pins of the conversion chip. The first filter circuit includes a first polarized capacitor EC1 and a second polarized capacitor E1. The positive terminals of the first polarized capacitor EC1 and the second polarized capacitor E1 are connected to the positive terminal of the power supply, and the negative terminals are connected to the negative terminal of the power supply.

[0009] Beneficial effects: The first diode D1 is used to prevent reverse connection. After the positive terminal of the power supply is filtered by the first polarized capacitor EC1 and the second polarized capacitor E1, a stable voltage is input to the conversion chip.

[0010] In a preferred embodiment of this utility model, the VDD pin of the conversion chip is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the input terminal of the voltage regulation circuit; the COMP pin of the conversion chip is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the input terminal of the voltage regulation circuit; the GND pin of the conversion chip is directly connected to the input terminal of the voltage divider circuit.

[0011] Beneficial effects: The VDD pin is connected to the second capacitor C2 and the voltage regulation circuit, and finally to the negative terminal for power supply. The COMP pin is a compensation pin used to connect to an external compensation network to adjust the output characteristics of the chip.

[0012] In a preferred embodiment of this utility model, the voltage regulating circuit includes a first resistor R1, a second resistor R7, and an inductor L3. One end of the second resistor R7 is connected to the front end of the inductor L3, and is also connected to the GND pin of the conversion chip, one end of the first capacitor C1, and one end of the second capacitor C2. The other end of the second resistor R7 is connected to the FB pin of the conversion chip and to one end of the first resistor R1. The other end of the first resistor R1 is connected to the rear end of the inductor L3 and is connected to the second filter circuit.

[0013] Beneficial effects: The first resistor R1 and the second resistor R7 are used to regulate the voltage, the inductor L3 is used for rectification, and the FB pin receives the output voltage feedback signal for closed-loop control.

[0014] In a preferred embodiment of this utility model, the second filter circuit includes a third polarized capacitor E2, a fourth polarized capacitor E4, and a third resistor R9. One end of the third resistor R9 is connected to the rear end of the inductor L3 and one end of the second resistor R7, and the other end of the third resistor R9 is connected to the negative terminal of the power supply and grounded. The positive terminals of the third polarized capacitor E2 and the fourth polarized capacitor E4 are connected to the rear end of the inductor L3, and the negative terminals are connected to the negative terminal of the power supply.

[0015] Beneficial effects: The third polarized capacitor E2 and the fourth polarized capacitor E4 are used for filtering and voltage regulation.

[0016] In a preferred embodiment of this utility model, the voltage divider circuit includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R8, and a Zener transistor Q1. One end of the fourth resistor R4 is connected to the rear end of the inductor L3. The other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and pin 2 of the Zener transistor Q1. The other end of the fifth resistor R5 is connected to one end of the sixth resistor R8 and pin 1 of the Zener transistor. The other end of the sixth resistor R8 is connected in parallel with pin 3 of the Zener transistor and then grounded.

[0017] Beneficial effects: The fourth resistor R4 is used to reduce voltage, and the fifth resistor R5, the sixth resistor R8 and the Zener transistor are used to stabilize voltage. This circuit forms an LDO circuit, that is, a low dropout linear regulator circuit. This circuit can work under low dropout conditions, reducing energy loss and extending battery life. At the same time, the LDO circuit has fewer external components, which simplifies the circuit board layout. There is also no switching action, so it will not generate high-frequency electromagnetic interference.

[0018] In a preferred embodiment of this utility model, the third filter circuit includes a fifth polarized capacitor E3 and a third capacitor C3. The positive terminal of the fifth polarized capacitor E3, one end of the third capacitor C3, and pin 1 of the Zener transistor Q1 are connected. The negative terminal of the fifth polarized capacitor E3 and the other end of the third capacitor C3 are connected in parallel and then grounded.

[0019] Beneficial effects: The fifth polarized capacitor E3 and the third capacitor C3 are both used for filtering and voltage regulation.

[0020] In a preferred embodiment of this utility model, when the input signal is low, the backlight module includes a second diode D3, a seventh resistor R52 and a fourth capacitor C9. The negative terminal of the second diode receives the signal BL, and the positive terminal is connected to one end of the seventh resistor R52. The other end of the seventh resistor R52 outputs a signal and is connected to one end of the fourth capacitor C9. The other end of the fourth capacitor C9 is grounded.

[0021] Beneficial effects: The seventh resistor R52 limits the external current to prevent the main chip from burning out due to excessive voltage, and the fourth capacitor C9 can filter out noise and reduce interference.

[0022] In a preferred embodiment of this utility model, when the input signal is high level, the backlight module includes an eighth resistor R3, a seventh resistor R52, a ninth resistor R53, and a fourth capacitor C9. One end of the eighth resistor R3 receives the signal BL, and the other end is connected to one end of the seventh resistor R52 and one end of the ninth resistor R53. The other end of the ninth resistor R53 is grounded. The other end of the seventh resistor R52 outputs a signal and is connected to one end of the fourth capacitor C9. The other end of the fourth capacitor C9 is grounded.

[0023] Beneficial effect: The seventh resistor R52 can prevent the voltage from floating. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0025] Figure 1 This is a circuit diagram of the power conversion module described in an embodiment of the intelligent digital instrument circuit for electric bicycles of this utility model.

[0026] Figure 2 This is a general circuit diagram of the backlight module described in an embodiment of the intelligent digital instrument circuit for electric bicycles of this utility model. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of this utility model, and should not be construed as limiting the utility model.

[0028] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of the embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0031] Example 1

[0032] As attached Figure 1 As shown, this utility model provides an intelligent digital instrument circuit for electric vehicles: it includes a power conversion module, the power conversion module includes a conversion chip, the conversion chip is an SD4943 chip, the SD4943 has low cost and can effectively reduce production costs.

[0033] The positive terminal of the power supply is connected to the conversion chip after passing through the first filter circuit. Specifically, a first diode D1 (IN4007) is provided between the positive terminal of the power supply and the conversion chip. The input terminal of the first diode D1 is connected to the positive terminal of the power supply, and the output terminal is connected to the four DRAIN pins of the conversion chip. The first filter circuit includes a first polarized capacitor EC1 and a second polarized capacitor E1. The first polarized capacitor EC1 (VENT) and the second polarized capacitor E1 (VEJ-10V101MH4) are both 10uF / 100V. The positive terminals of the first polarized capacitor EC1 and the second polarized capacitor E1 are connected to the positive terminal of the power supply, and the negative terminals are connected to the negative terminal of the power supply. The first diode D1 is used for reverse connection protection. After being filtered by the first polarized capacitor EC1 and the second polarized capacitor E1, the positive terminal of the power supply provides a stable voltage to the conversion chip.

[0034] The conversion chip outputs a first voltage after passing through a voltage regulation circuit and a second filter circuit. Specifically, the VDD pin of the conversion chip is connected to one end of a second capacitor C2, and the other end of the second capacitor C2 is connected to the input terminal of the voltage regulation circuit. The second capacitor C2 is a CL21B471KQQNNNC type. The VDD pin is connected to the second capacitor C2 and then to the voltage regulation circuit, and finally to the negative terminal for power supply.

[0035] The COMP pin of the conversion chip is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is connected to the input terminal of the voltage regulation circuit. The COMP pin is a compensation pin used to connect an external compensation network to adjust the output characteristics of the chip. The GND of the conversion chip is directly connected to the input terminal of the voltage divider circuit. The first capacitor C1 is model CL21B471KQQNNNC.

[0036] The voltage regulation circuit includes a first resistor R1, a second resistor R7, and an inductor L3. One end of the second resistor R7 is connected to the front end of the inductor L3, and is also connected to the GND pin of the conversion chip, one end of the first capacitor C1, and one end of the second capacitor C2. The other end of the second resistor R7 is connected to the FB pin of the conversion chip and to one end of the first resistor R1. The other end of the first resistor R1 is connected to the rear end of the inductor L3 and then connected to the second filter circuit. The first resistor R1 and the second resistor R7 are used to regulate the voltage, and the inductor L3 is used for rectification. The FB pin receives the output voltage feedback signal for closed-loop control. The first resistor R1 and the second resistor R7 are both RC1206-10K-F-1 / 4W, and the inductor L3 is HPC8040NF-101M.

[0037] The second filter circuit includes a third polarized capacitor E2, a fourth polarized capacitor E4, and a third resistor R9. One end of the third resistor R9 is connected to the rear end of the inductor L3 and one end of the second resistor R7, and the other end of the third resistor R9 is connected to the negative terminal of the power supply and grounded. The positive terminals of the third polarized capacitor E2 and the fourth polarized capacitor E4 are connected to the rear end of the inductor L3, and the negative terminals are connected to the negative terminal of the power supply. The third polarized capacitor E2 and the fourth polarized capacitor E4 are used for filtering and voltage regulation. The third polarized capacitor E2 and the fourth polarized capacitor E4 are both VEJ-10V470MH-R, with a size of 470uF / 10V. The third resistor R9 is RC0805-510Ω-F-1 / 8W. The second filter circuit also includes a second diode D2. The positive terminal of the second diode D2 is connected to the negative terminal of the fourth polarized capacitor E4, and the negative terminal of the second diode D2 is connected to the front end of the inductor L3. The second diode D2 is used to reduce high-voltage start-up power consumption.

[0038] The output of the second filter circuit is also connected to a voltage divider circuit, and the output of the voltage divider circuit is led out as a second voltage after passing through the third filter circuit.

[0039] Specifically: the voltage divider circuit includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R8, and a Zener transistor Q1. One end of the fourth resistor R4 is connected to the rear end of the inductor L3. The other end of the fourth resistor R4 is connected to one end of the fifth resistor R5 and pin 2 of the Zener transistor Q1. The other end of the fifth resistor R5 is connected to one end of the sixth resistor R8 and pin 1 of the Zener transistor. The other end of the sixth resistor R8 is connected in parallel with pin 3 of the Zener transistor and then grounded. The fourth resistor R4 is used for voltage reduction. The fifth resistor R5, the sixth resistor R8, and the... The Zener transistor is used to stabilize the voltage. The fourth resistor R4 is an RC0805-20Ω-F-1 / 8W resistor, the fifth resistor R5 is an RC0603-8.2KF-1 / 8W resistor, the sixth resistor R8 is an RC0603-10KF-1 / 8W resistor, and the Zener transistor Q1 is a TL431. This circuit forms an LDO circuit, which is a low-dropout linear regulator circuit. This circuit can operate under low dropout conditions, reducing energy loss and extending battery life. At the same time, the LDO circuit has fewer external components, simplifying the circuit board layout. It also has no switching action and does not generate high-frequency electromagnetic interference.

[0040] The third filter circuit includes a fifth polarized capacitor E3 and a third capacitor C3. The positive terminal of the fifth polarized capacitor E3, one end of the third capacitor C3, and pin 1 of the Zener transistor Q1 are connected. The negative terminal of the fifth polarized capacitor E3 and the other end of the third capacitor C3 are connected in parallel and grounded. Both the fifth polarized capacitor E3 and the third capacitor C3 are used for filtering and voltage regulation. The fifth polarized capacitor E3 is model VEJ-6.3V101MH4.3-R (100uF / 6.3V), and the third capacitor C3 is model CL10A104KQ5NNNC.

[0041] As attached Figure 2 As shown, in this embodiment, a backlight module is also included. The backlight module is used to receive signals and reduce the brightness of the instrument. When the input signal is low, the backlight module includes a second diode D3, a seventh resistor R52, and a fourth capacitor C9. The negative terminal of the second diode receives the signal BL, and the positive terminal is connected to one end of the seventh resistor R52. The other end of the seventh resistor R52 outputs a signal and is connected to one end of the fourth capacitor C9. The other end of the fourth capacitor C9 is grounded. The seventh resistor R52 limits the external current to prevent the main chip from burning out due to excessive voltage. The fourth capacitor C9 can filter out noise and reduce noise interference. The second diode is an IN4148, the seventh resistor R52 is an RC0603-20K-F-1 / 10W, and the fourth capacitor C9 is a CL10A104M08NQNC.

[0042] Example 2

[0043] As attached Figure 2 As shown: Unlike the first embodiment, in this embodiment, when the input signal is high, the backlight module includes an eighth resistor R3, a seventh resistor R52, a ninth resistor R53, and a fourth capacitor C9. One end of the eighth resistor R3 receives the signal BL, and the other end is connected to one end of the seventh resistor R52 and one end of the ninth resistor R53. The other end of the ninth resistor R53 is grounded. The other end of the seventh resistor R52 outputs a signal and is connected to one end of the fourth capacitor C9. The other end of the fourth capacitor C9 is grounded. The seventh resistor R52 can prevent the voltage from floating. The resistance value of the eighth resistor R3 is 200KΩ. The model of the ninth resistor R53 is RC0603-100K-F-1 / 10W. The model of the seventh resistor R52 is RC0603-20K-F-1 / 10W. The model of the fourth capacitor C9 is CL10A104M08NQNC.

[0044] The preferred embodiments of this application have been described in detail above with reference to the accompanying drawings. Typical known structures and common knowledge techniques in the preferred embodiments have not been described in detail here. Those skilled in the art can improve and implement the technical solution of this utility model based on the inspiration given in these embodiments and their own capabilities. Some typical known structures, known methods or common knowledge techniques should not be obstacles for those skilled in the art to implement this application.

[0045] The scope of protection claimed in this application shall be determined by the contents of its claims. The contents of the utility model description, specific embodiments, and drawings are used to interpret the claims.

[0046] Within the scope of the technical concept of this application, several modifications can be made to the specific implementation of this application, and these modified implementations should also be considered within the protection scope of this application.

Claims

1. A battery powered vehicle intelligent digital instrument circuit, characterized by: The device includes a power conversion module and a backlight module. The power conversion module includes a conversion chip. The positive terminal of the power supply is connected to the conversion chip after passing through a first filter circuit. The conversion chip outputs a first voltage after passing through a voltage regulation circuit and a second filter circuit. The output terminal of the second filter circuit is also connected to a voltage divider circuit. The output terminal of the voltage divider circuit outputs a second voltage after passing through a third filter circuit.

2. The intelligent digital instrument circuit for electric vehicles according to claim 1, characterized in that: The conversion chip used is the SD4943 chip.

3. The electric-battery vehicle intelligent digital gauge circuit of claim 2, wherein: A first diode is also provided between the positive terminal of the power supply and the conversion chip. The input terminal of the first diode is connected to the positive terminal of the power supply, and the output terminal is connected to the four DRAIN pins of the conversion chip. The first filter circuit includes a first polarized capacitor and a second polarized capacitor. The positive terminals of the first polarized capacitor and the second polarized capacitor are connected to the positive terminal of the power supply, and the negative terminals are connected to the negative terminal of the power supply.

4. The smart digital gauge circuit for electric-battery vehicles of claim 2, wherein: The VDD pin of the conversion chip is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the input terminal of the voltage regulation circuit; the COMP pin of the conversion chip is connected to one end of the first capacitor, and the other end of the first capacitor is connected to the input terminal of the voltage regulation circuit; the GND pin of the conversion chip is directly connected to the input terminal of the voltage divider circuit.

5. The electric-battery vehicle intelligent digital gauge circuit of claim 4, wherein: The voltage regulation circuit includes a first resistor, a second resistor, and an inductor. One end of the second resistor is connected to the front end of the inductor and to the GND pin of the conversion chip, one end of the first capacitor, and one end of the second capacitor. The other end of the second resistor is connected to the FB pin of the conversion chip and to one end of the first resistor. The other end of the first resistor is connected to the rear end of the inductor and to the second filter circuit.

6. The electric-battery vehicle intelligent digital gauge circuit of claim 5, wherein: The second filter circuit includes a third polarized capacitor, a fourth polarized capacitor, and a third resistor. One end of the third resistor is connected to the rear end of the inductor and one end of the second resistor, and the other end of the third resistor is connected to the negative terminal of the power supply and grounded. The positive terminals of the third polarized capacitor and the fourth polarized capacitor are connected to the rear end of the inductor, and the negative terminals are connected to the negative terminal of the power supply.

7. The electric-battery vehicle intelligent digital gauge circuit of claim 6, wherein: The voltage divider circuit includes a fourth resistor, a fifth resistor, a sixth resistor, and a Zener transistor. One end of the fourth resistor is connected to the rear end of the inductor. The other end of the fourth resistor is connected to one end of the fifth resistor and pin 2 of the Zener transistor. The other end of the fifth resistor is connected to one end of the sixth resistor and pin 1 of the Zener transistor. The other end of the sixth resistor is connected in parallel with pin 3 of the Zener transistor and then grounded.

8. The electric-battery vehicle intelligent digital gauge circuit of claim 7, wherein: The third filter circuit includes a fifth polarized capacitor and a third capacitor. The positive terminal of the fifth polarized capacitor, one end of the third capacitor, and pin 1 of the Zener transistor are connected. The negative terminal of the fifth polarized capacitor and the other end of the third capacitor are connected in parallel and then grounded.

9. The electric-battery vehicle intelligent digital gauge circuit of claim 1, wherein: When the input signal is low, the backlight module includes a second diode, a seventh resistor, and a fourth capacitor. The negative terminal of the second diode receives the signal BL, and the positive terminal is connected to one end of the seventh resistor. The other end of the seventh resistor outputs a signal and is connected to one end of the fourth capacitor. The other end of the fourth capacitor is grounded.

10. The electric-battery vehicle intelligent digital gauge circuit of claim 1, wherein: When the input signal is high, the backlight module includes an eighth resistor, a seventh resistor, a ninth resistor, and a fourth capacitor. One end of the eighth resistor receives the signal BL, and the other end is connected to one end of the seventh resistor and one end of the ninth resistor. The other end of the ninth resistor is grounded. The other end of the seventh resistor outputs a signal and is connected to one end of the fourth capacitor. The other end of the fourth capacitor is grounded.

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