Low-dropout electric bicycle LED steering lamp circuit

Abstract

The utility model discloses a low-dropout electric bicycle LED steering lamp circuit, which relates to the field of control circuits and comprises a micro-control module. The switch module at least comprises a switch device Q1, and the switch device Q1 is connected between the battery pack VB1 and the LED lamp; the charge pump module is adaptively connected with the micro-control module, the switching device Q1 and the LED lamp and is used for driving the switching device Q1; the power supply module is adaptively connected with the battery pack VB1 and the micro-control module and is used for generating working voltage required by the micro-control module; and the micro-control module controls the conduction state of the switching device Q1 through the charge pump module, so that the connection state of the LED lamp and the battery pack VB1 is controlled. According to the LED steering lamp circuit, the voltage difference between the working voltage of the battery pack VB1 and the working voltage of the LED lamp is relatively low, and the LED steering lamp circuit has wide applicability.

Description

Technical Field

[0001] The utility model relates to the field of control circuits, in particular to a low dropout electric bicycle LED turn signal circuit. Background Art

[0002] In recent years, due to the advantages of beauty and energy saving of LEDs, more and more lamps in electric bicycles have been converted from halogen bulbs to LEDs. Among them, the application of electric bicycle LED turn signals is the most extensive.

[0003] The electric bicycle LED turn signal is controlled by an LED turn signal circuit. Figure 1 The traditional LED turn signal circuit is shown as Figure 1 As shown, when the toggle switch K1 changes from the off state to the on state, the traditional LED turn signal circuit charges the capacitor C1 through the battery pack VB1, turns on the MCU by the capacitor C1, and then outputs a driving voltage through the output pin of the MCU to control the conduction state of the NMOS transistor Q1. When the NMOS transistor Q1 is turned on, the LED light board is powered on and lit. When the NMOS transistor Q1 is turned off, the LED light board is powered off and turned off, so as to realize the turn indication function.

[0004] In the traditional LED turn signal circuit, since the MCU and the driving circuit of the MCU are connected in series between the battery pack and the LED light board, the battery pack must provide a voltage higher than the working voltage of the LED light board by the voltage required for the normal operation of the MCU to drive the NMOS transistor, so as to realize the normal flashing of the LED light board. That is, there is a large voltage difference between the voltage provided by the battery pack VB1 and the working voltage of the LED light board in this circuit. At the same time, the driving voltage of the NMOS transistor is directly provided through the MCU pin in the traditional LED turn signal circuit, and the driving stability is poor. In addition, this circuit also requires that the static current of the MCU is small during the off period of the NMOS transistor Q1 to prevent the LED light board from having a slightly lit state, and the application conditions are harsh. Summary of the Utility Model

[0005] The applicant of the present utility model aims at the above problems and technical requirements, and proposes a low dropout electric bicycle LED turn signal circuit.

[0006] The technical solution of the present utility model is as follows:

[0007] A low dropout electric bicycle LED turn signal circuit includes:

[0008] A micro control module;

[0009] A switch module, at least including a switching device Q1, and the switching device Q1 is connected between the battery pack VB1 and the LED lamp.

[0010] A charge pump module, adaptively connected to a micro - control module, a switching device Q1, and an LED lamp, is used to drive the switching device Q1;

[0011] A power supply module, adaptively connected to a battery pack VB1 and a micro - control module, is used to generate the working voltage required by the micro - control module;

[0012] The micro - control module controls the on - off state of the switching device Q1 through the charge pump module to control the connection state between the LED lamp and the battery pack VB1.

[0013] A further technical solution thereof is that the charge pump module includes a capacitor C2, a capacitor C3, a diode D2, a diode D3, and a resistor R2. Among them,

[0014] One end of the capacitor C2 is connected to the micro - control module, the other end of the capacitor C2 is connected to the anode of the diode D2 and the cathode of the diode D3. The cathode of the diode D2 is connected to one end of the resistor R2, one end of the capacitor C3, and the second electrode terminal of the switching device Q1. The other end of the resistor R2, the other end of the capacitor C3, and the anode of the diode D3 are connected to the positive terminal of the LED lamp.

[0015] A further technical solution thereof is that the power supply module includes a resistor R1 and a capacitor C1. Among them,

[0016] The third electrode terminal of the switching device Q1 is connected to one end of the capacitor C1 through the resistor R1, and the other end of the capacitor C1 is grounded.

[0017] A further technical solution thereof is that the power supply module further includes a zener diode D1;

[0018] The cathode of the zener diode D1 is connected to one end of the capacitor C1 and one end of the resistor R1, and the anode of the zener diode D1 is connected to the other end of the capacitor C1 and grounded.

[0019] A further technical solution thereof is that the micro - control module includes an MCU;

[0020] The MCU includes a power supply pin VCC, a ground pin GND, and a signal output pin IO1;

[0021] The signal output pin IO1 is used to output a driving signal.

[0022] A further technical solution thereof is that the power supply pin VCC is connected to one end of the resistor R1, one end of the capacitor C1, and the cathode of the zener diode D1;

[0023] The signal output pin IO1 is connected to the anode of the diode D2 and the cathode of the diode D3 through the capacitor C2, and the ground pin GND is grounded.

[0024] A further technical solution thereof is that the driving signal includes a PWM square wave signal.

[0025] A further technical solution thereof is that the switching module further includes an active switch K1;

[0026] When the switching module includes the active switch K1, the third electrode terminal of the switching device Q1 is connected to the positive electrode terminal of the battery pack VB1 through the active switch K1.

[0027] A further technical solution thereof is that the switching device Q1 includes a PMOS transistor or an NMOS transistor.

[0028] A further technical solution thereof is that the LED lamp fixture includes an LED lamp board.

[0029] The beneficial technical effects of the present utility model are as follows:

[0030] The LED turn signal circuit provided by the present utility model generates the working voltage required by the micro-control module through the power supply module, and uses the micro-control module to control the on-off state of the switching device Q1 through the charge pump module, so as to control the connection state between the LED lamp fixture and the battery pack VB1, so as to realize the control function of the LED lamp fixture.

[0031] Compared with the traditional LED turn signal control circuit, the voltage difference between the voltage required by the battery pack VB1 and the working voltage of the LED lamp fixture in this circuit is very low. At the same time, the driving of the switching device Q1 is more stable, and no current will flow through the LED lamp fixture when the switching device Q1 is in the off state, thus reducing the limitations of application conditions and having a wider applicability. Description of the Drawings

[0032] Figure 1 is the circuit schematic diagram of the traditional electric bicycle LED turn signal circuit.

[0033] Figure 2 is the circuit schematic diagram of the low-voltage-drop electric bicycle LED turn signal circuit provided by the present utility model. Detailed Embodiments

[0034] The following further describes the detailed embodiments of the present utility model with reference to the drawings.

[0035] The present utility model provides a low-voltage-drop electric bicycle LED turn signal circuit, including:

[0036] A micro-control module;

[0037] A switching module, at least including a switching device Q1, and the switching device Q1 is connected between the battery pack VB1 and the LED lamp fixture;

[0038] A charge pump module, adaptively connected to a micro-control module, a switching device Q1, and an LED lamp, is used to drive the switching device Q1;

[0039] A power supply module, adaptively connected to a battery pack VB1 and a micro-control module, is used to generate the operating voltage required by the micro-control module;

[0040] The micro-control module controls the conduction state of the switching device Q1 through the charge pump module to control the connection state between the LED lamp and the battery pack VB1.

[0041] In an embodiment of the present invention, the switching device Q1 is connected between the battery pack VB1 and the LED lamp. When the switching device Q1 is turned on, the battery pack VB1 is connected to the LED lamp through the switching device Q1, and the battery supplies power to the LED lamp; conversely, when the switching device Q1 is turned off, the battery pack VB1 is disconnected from the LED lamp, and the battery pack VB1 stops supplying power to the LED lamp. Therefore, the present invention can control the connection relationship between the battery pack VB1 and the LED lamp by controlling the conduction state of the switching device Q1, thereby realizing the control of the working state of the LED lamp. The specific connection manner of the battery pack VB1, the switching device Q1, and the LED lamp can refer to the following description. The above-mentioned LED lamp is the LED turn signal installed in an electric bicycle. In this embodiment, the LED lamp adopts an LED lamp board. Specifically, the form of the LED lamp can be selected according to actual needs.

[0042] Specifically, the low voltage difference specifically refers to that the voltage difference between the voltage required to be provided by the battery pack VB1 and the operating voltage of the LED lamp board is very low. In the present invention, the micro-control module and the power supply module are not connected in series between the battery pack VB1 and the LED lamp. Therefore, the battery pack VB1 does not need to provide a voltage higher than the operating voltage of the LED lamp by the voltage required for the MCU to work normally. Therefore, in the LED turn signal circuit provided by the present invention, the voltage difference between the voltage required to be provided by the battery pack VB1 and the operating voltage of the LED lamp is relatively low. The present invention can also improve the driving stability of the switching device Q1 by driving the switching device Q1 through the charge pump module. In addition, no current will flow through the LED lamp when the switching device Q1 is in the off state, thereby reducing the application conditions and making the circuit have a wider applicability. The manner in which the micro-control module controls the conduction state of the switching device Q1 through the charge pump module, and the specific connection forms of the micro-control module, the switching module, the charge pump module, and the power supply module can all refer to the following description.

[0043] Further, the switching module further includes an active switch K1;

[0044] When the switch module includes the active switch K1, the third electrode terminal of the switching device Q1 is connected to the positive terminal of the battery pack VB1 through the active switch K1.

[0045] When the switch module includes the active switch K1, when the active switch K1 is closed, the LED turn signal circuit of the electric bicycle works. When the active switch K1 is opened, the LED turn signal circuit of the electric bicycle stops working.

[0046] Further, the charge pump module includes a capacitor C2, a capacitor C3, a diode D2, a diode D3, and a resistor R2, where

[0047] One end of the capacitor C2 is connected to the micro control module, the other end of the capacitor C2 is connected to the anode of the diode D2 and the cathode of the diode D3, the cathode of the diode D2 is connected to one end of the resistor R2, one end of the capacitor C3, and the second electrode terminal of the switching device Q1, and the other end of the resistor R2, the other end of the capacitor C3, and the anode of the diode D3 are connected to the positive terminal of the LED lamp.

[0048] Specifically, the switching device Q1 can be a PMOS transistor or an NMOS transistor. Since the cost of a PMOS transistor is usually higher than that of an NMOS transistor, to reduce the cost of the LED turn signal circuit, preferably, the switching device Q1 uses an NMOS transistor. When the switching device Q1 is an NMOS transistor, the first electrode terminal of the switching device Q1 is the source terminal, the second electrode terminal of the switching device Q1 is the gate terminal, and the third electrode terminal of the switching device Q1 is the drain terminal.

[0049] Figure 2 Shows the circuit schematic diagram of the LED turn signal circuit of an electric bicycle in an embodiment of the present invention when the switching device Q1 is an NMOS transistor. As Figure 2 shown, the drain terminal of the switching device Q1 is connected to the positive terminal of the battery pack VB1 through the active switch K1, and the source terminal of the switching device Q1 is connected to one end of the resistor R2, one end of the capacitor C3, the anode of the diode D3, and the positive terminal of the LED lamp board. The negative terminal of the battery pack VB1 and the negative terminal of the LED lamp board are both grounded.

[0050] Further, the micro control module includes an MCU;

[0051] The MCU includes a power supply pin VCC, a ground pin GND, and a signal output pin IO1;

[0052] The signal output pin IO1 is used to output a driving signal;

[0053] The power supply module includes a resistor R1 and a capacitor C1. The third electrode terminal of the switching device Q1 is connected to one end of the capacitor C1 through the resistor R1, and the other end of the capacitor C1 is grounded.

[0054] Specifically, the power supply module further includes a zener diode D1. The cathode of the zener diode D1 is connected to one end of the capacitor C1 and one end of the resistor R1, and the anode of the zener diode D1 is connected to the other end of the capacitor C1 and grounded. The power supply pin VCC is connected to one end of the resistor R1, one end of the capacitor C1, and the cathode of the zener diode D1. The signal output pin IO1 is connected to the anode of the diode D2 and the cathode of the diode D3 through a capacitor C2, and the ground pin GND is grounded. The zener diode D1 is used to protect the capacitor C1 and the MCU from being broken down by overvoltage. The resistor R1 is used as a current-limiting resistor to limit the charging current of the capacitor C1.

[0055] The above micro-control module controls the on-state of the switching device Q1 through a charge pump module. Specifically, when the micro-control module drives the charge pump module to work by outputting a driving signal, the charge pump module provides an opening voltage for the switching device Q1, and the switching device Q1 conducts. When the micro-control module stops outputting the driving signal, the charge pump module stops providing the opening voltage for the switching device Q1, and the switching device Q1 turns off. The specific manner in which the micro-control module drives the charge pump module to work by outputting a driving signal can be referred to the following working principle description.

[0056] Further, the driving signal includes a PWM square wave signal.

[0057] In this embodiment, the driving signal is a PWM square wave signal with a duty cycle of 50% and a frequency of 15KHZ from 0 to 5V. Specifically, when implemented, the form of the driving signal can be selected according to the actual situation.

[0058] The following takes the switching device Q1 as an NMOS transistor and the LED lamp as an LED lamp board as an example to illustrate the specific working principle of the low-dropout LED turn signal circuit for electric bicycles provided by the present invention:

[0059] When the active switch K1 changes from the off state to the on state, the battery pack VB1 charges the capacitor C1 through the resistor R1. After the capacitor C1 is charged, it provides the working voltage required by the MCU to the MCU power supply pin VCC, and the MCU starts to work.

[0060] When the MCU outputs a driving signal through the signal output pin IO1, the capacitor C2 in the charge pump module will charge the capacitor C3 through the diode D2 and the diode D3, and a voltage of about 4V will be quickly generated between the gate terminal and the source terminal of the NMOS tube Q1, thereby turning on the NMOS tube Q1, and the battery pack VB1 supplies power to the LED light board through the NMOS tube Q1, and the LED light board is lit.

[0061] When the MCU stops outputting the driving signal, that is, the signal output pin IO1 changes from outputting the driving signal to outputting a low level, the capacitor C3 stops charging and discharges through the resistor R2, and the voltage between the gate terminal and the source terminal of the NMOS tube Q1 will quickly drop to 0V, thereby turning off the NMOS tube Q1, and the battery pack VB1 no longer supplies power to the LED light board through the NMOS tube Q1, and the LED light board goes out. Therefore, in actual applications, the working state of the LED light board can be controlled by configuring the output state of the MCU signal output pin IO1.

[0062] The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A low voltage difference electric bicycle LED turn signal circuit, characterized in that: include: Microcontroller module; The switch module at least comprises a switch device Q1, wherein the switch device Q1 is connected between the battery pack VB1 and the LED lamp; A charge pump module is adapted and connected with the microcontroller module, the switch device Q1 and the LED lamp, and is used to drive the switch device Q1; A power module is adapted to be connected with the battery pack VB1 and the microcontroller module, and is used to generate the working voltage required by the microcontroller module; The microcontroller module controls the conduction state of the switch device Q1 through the charge pump module to control the connection state between the LED lamp and the battery pack VB1.

2. The low voltage difference electric bicycle LED turn signal circuit according to claim 1, characterized in that: The charge pump module includes a capacitor C2, a capacitor C3, a diode D2, a diode D3 and a resistor R2, wherein: One end of the capacitor C2 is connected to the microcontroller module, the other end of the capacitor C2 is connected to the anode of the diode D2 and the cathode of the diode D3, the cathode of the diode D2 is connected to one end of the resistor R2, one end of the capacitor C3 and the second electrode end of the switch device Q1, and the other end of the resistor R2, the other end of the capacitor C3 and the anode of the diode D3 are connected to the positive end of the LED lamp.

3. The low voltage difference electric bicycle LED turn signal circuit according to claim 1, characterized in that: The power module includes a resistor R1 and a capacitor C1, wherein: The third electrode terminal of the switch device Q1 is connected to one end of the capacitor C1 through the resistor R1, and the other end of the capacitor C1 is grounded.

4. The low voltage difference electric bicycle LED turn signal circuit according to claim 3 is characterized in that: The power module also includes a voltage regulator diode D1; The cathode of the voltage zener diode D1 is connected to one end of the capacitor C1 and one end of the resistor R1 , and the anode of the voltage zener diode D1 is connected to the other end of the capacitor C1 and is grounded.

5. The low voltage difference electric bicycle LED turn signal circuit according to claim 4, characterized in that: The microcontroller module includes an MCU; The MCU includes a power pin VCC, a ground pin GND and a signal output pin IO1; The signal output pin IO1 is used to output a driving signal.

6. The low voltage difference electric bicycle LED turn signal circuit according to claim 5, characterized in that: The power supply pin VCC is connected to one end of the resistor R1, one end of the capacitor C1 and the cathode of the voltage stabilizing diode D1; The signal output pin IO1 is connected to the anode of the diode D2 and the cathode of the diode D3 via the capacitor C2, and the ground pin GND is grounded.

7. The low voltage difference electric bicycle LED turn signal circuit according to claim 5, characterized in that: The driving signal includes a PWM square wave signal.

8. The low voltage difference electric bicycle LED turn signal circuit according to claim 1, characterized in that: The switch module also includes an active switch K1; When the switch module includes the active switch K1 , the third electrode terminal of the switch device Q1 is connected to the positive terminal of the battery pack VB1 through the active switch K1 .

9. The low voltage difference electric bicycle LED turn signal circuit according to claim 1, characterized in that: The switch device Q1 includes a PMOS tube or an NMOS tube.

10. The low voltage difference electric bicycle LED turn signal circuit according to claim 1, characterized in that: The LED lamp comprises an LED lamp panel.

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