A sunshade curtain driving circuit, a sunroof sunshade curtain device and a vehicle

Abstract

The utility model provides a sunshade curtain drive circuit, sunroof sunshade curtain device and car belong to electric sunshade curtain technical field, including controller, winding motor is used for driving flexible axle rotation and curtain cloth retraction movement, motor drive subcircuit is connected with the controller electrically, is used for receiving the control signal of controller and provides PWM drive signal to winding motor to adjust the rotation direction and rotational speed of winding motor, ripple acquisition subcircuit is connected with winding motor electrically, is used for obtaining the ripple signal of winding motor rotation, after the pre -treatment of ripple signal, the timer port of controller is sent and carries out ripple signal count, power conversion subcircuit is connected with controller, motor drive subcircuit, ripple acquisition subcircuit electrically respectively, is used for providing electric energy. The utility model adjusts the rotation direction and rotational speed of motor through the adjustment of the selection direction of winding motor, and further adjusts duty ratio, improves the abnormal sound of the impact crossbeam.

Description

Technical Field

[0001] This utility model relates to the field of electric sunshade technology, and in particular to a sunshade drive circuit, a sunroof sunshade device, and an automobile. Background Technology

[0002] Spinner-type sunshades typically consist of a flexible shaft, curtain fabric, support rod, drive motor, and a pair of cables. A circular groove is located on the car roof, with a pair of cables symmetrically embedded within it and fixed to the support rod. One end of the curtain fabric connects to the support rod, and the other end connects to the flexible shaft. The drive motor rotates the flexible shaft, simultaneously moving the cables along the groove, thus extending or retracting the curtain fabric to achieve sun shading. When closed, spinner-type sunshades usually move at a constant speed, which can cause the support rod to collide with the front or rear crossbeams of the sunroof, producing abnormal noise that affects the driver's driving experience and comfort.

[0003] Therefore, it is essential to provide a sunshade drive circuit, a sunroof sunshade device, and an automobile that enables the drive motor to adjust the movement speed of the curtain and the support rod, thereby preventing the support rod from rapidly impacting the sunroof beam and causing abnormal noise. Utility Model Content

[0004] In view of this, the present invention proposes a sunshade drive circuit, a sunshade device, and an automobile that can adjust the movement speed of the curtain and improve the abnormal noise caused by the support rod rapidly hitting the crossbeam of the sunroof.

[0005] On the one hand, this utility model provides a sunshade curtain driving circuit, including: Controller; The winding motor is used to drive the rotation of the flexible shaft and the extension and retraction of the curtain fabric; The motor drive sub-circuit is electrically connected to the controller and is used to receive control signals from the controller and provide PWM drive signals to the winding motor to adjust the rotation direction and speed of the winding motor. The ripple acquisition sub-circuit is electrically connected to the winding motor and is used to acquire the ripple signal of the winding motor rotation. After preprocessing the ripple signal, it is sent to the timer port of the controller for ripple signal counting. The power conversion sub-circuit is electrically connected to the controller, motor drive sub-circuit, and ripple acquisition sub-circuit, respectively, to provide electrical energy.

[0006] Based on the above technical solutions, preferably, the motor drive sub-circuit includes an H-bridge driver U3, a bridge circuit sub-module, and a bridge power supply; the H-bridge driver U3 is electrically connected to the controller, and the output terminals of the H-bridge driver U3 are electrically connected one-to-one with the input terminals of the bridge circuit sub-module and the enable terminals of the bridge power supply; the output terminals of the bridge circuit sub-module are electrically connected to the winding motor; the H-bridge driver U3 is used to output PWM drive signals to the bridge circuit sub-module and the winding motor; the H-bridge driver U3 is also used to output enable signals to the bridge power supply to enable the bridge power supply to provide operating power to the bridge circuit sub-module.

[0007] Preferably, the bridge circuit module includes a second MOSFET Q2, a third MOSFET Q3, a fourth MOSFET Q4, and a fifth MOSFET Q5. The H-bridge driver U3 includes several first signal output terminals, which are electrically connected to the gates of the second MOSFET Q2, the third MOSFET Q3, the fourth MOSFET Q4, and the fifth MOSFET Q5 respectively. The drains of the second MOSFET Q2 and the fourth MOSFET Q4 are electrically connected to the output terminals of the bridge power supply, and the sources of the third MOSFET Q3 and the fifth MOSFET Q5 are both grounded. The source of the second MOSFET Q2 is electrically connected to the drain of the third MOSFET Q3 and serves as the first output terminal of the bridge circuit module. The source of the fourth MOSFET Q4 is electrically connected to the drain of the fifth MOSFET Q5 and serves as the second output terminal of the bridge circuit module. The first and second output terminals are electrically connected to the winding motor respectively, for outputting PWM drive signals to the winding motor to adjust the rotation direction and speed of the winding motor.

[0008] Preferably, the bridge power supply includes a first MOSFET Q1, a tenth resistor R10, a ninth resistor R9, and a Zener diode Z1; the output terminal of the H-bridge driver U3 is electrically connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is electrically connected to the gate of the first MOSFET Q1, the source of the first MOSFET Q1 is electrically connected to the vehicle power supply, the source of the first MOSFET Q1 is electrically connected to one end of the ninth resistor R9 and the anode of the Zener diode Z1, the other end of the ninth resistor R9 and the cathode of the Zener diode Z1 are both electrically connected to the gate of the first MOSFET Q1, and the drain of the first MOSFET Q1 serves as the output terminal of the bridge power supply; the output terminal of the H-bridge driver U3 outputs a high level to enable the first MOSFET Q1, and after the first MOSFET Q1 is turned on, it provides operating power to the bridge circuit submodule; the Zener diode Z1 is used to limit the maximum voltage between the gate and source of the first MOSFET Q1, and the ninth resistor R9 is used for electrostatic discharge.

[0009] Based on the above technical solutions, preferably, the ripple acquisition sub-circuit includes an I / V conversion unit, a bias circuit unit, and a differential amplifier unit; the input terminal of the I / V conversion unit is electrically connected to the winding motor, the output terminal of the I / V conversion unit is electrically connected to the non-inverting input terminal of the differential amplifier unit and the input terminal of the bias circuit unit, respectively, the output terminal of the bias circuit unit is electrically connected to the inverting input terminal of the differential amplifier unit, and the output terminal of the differential amplifier unit is electrically connected to the timer port of the controller.

[0010] Preferably, the I / V conversion unit includes a first resistor R1, a second resistor R2, and a first capacitor C1. One end of the first resistor R1 is electrically connected to the winding motor and one end of the second resistor R2, respectively. The other end of the second resistor R2 serves as the output terminal of the I / V conversion unit and is electrically connected to one end of the first capacitor C1, the input terminal of the bias circuit unit, and the non-inverting input terminal of the differential amplifier unit, respectively. The other ends of the first resistor R1 and the first capacitor C1 are grounded. The I / V conversion unit is used to convert the acquired current signal of the winding motor into a voltage signal.

[0011] Preferably, the bias circuit unit includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a second capacitor C2. One end of the third resistor R3 serves as the input terminal of the bias circuit unit. The other end of the third resistor R3 is electrically connected to one end of the fourth resistor R4, one end of the fifth resistor R5, and one end of the sixth resistor R6, respectively. The other end of the fourth resistor R4 is electrically connected to the output terminal of the power conversion sub-circuit. The other end of the sixth resistor R6 is electrically connected to the other input terminal of the differential amplifier unit and one end of the second capacitor C2, respectively. The other end of the fifth resistor R5 and the other end of the second capacitor C2 are grounded. The other end of the sixth resistor R6 serves as the output terminal of the bias circuit unit. The bias circuit unit boosts the voltage signal input from the I / V conversion unit and sends it to the differential amplifier unit.

[0012] Preferably, the differential amplifier unit includes an operational amplifier, a seventh resistor R7, and an eighth resistor R8. The non-inverting input of the operational amplifier is electrically connected to the output of the I / V conversion unit. One end of the seventh resistor R7 is electrically connected to the output of the bias circuit unit, and the other end of the seventh resistor R7 is electrically connected to the inverting input of the operational amplifier and one end of the eighth resistor R8, respectively. The other end of the eighth resistor R8 is electrically connected to the output of the operational amplifier, and the output of the operational amplifier is electrically connected to the timer port of the controller.

[0013] Based on the above technical solutions, preferably, the power conversion sub-circuit includes an LDO chip U1, the input terminal of the LDO chip U1 is electrically connected to the vehicle power supply, and the output terminal of the LDO chip is electrically connected to the controller, the motor drive sub-circuit, and the ripple acquisition sub-circuit.

[0014] On the other hand, this utility model also provides a skylight sunshade device, which is equipped with the above-mentioned sunshade drive circuit to make the movement speed of the curtain adjustable; one end of the curtain is fixed to the support rod, and the support rod moves synchronously with the curtain under the drive of the winding motor.

[0015] Preferably, the support rod is also equipped with vibration damping and buffering material.

[0016] Thirdly, this utility model also provides an automobile, including the aforementioned sunroof sunshade device.

[0017] The sunshade curtain drive circuit, sunroof sunshade curtain device, and automobile provided by this utility model have the following advantages compared with the prior art: (1) By configuring the motor drive sub-circuit, the voltage applied to the winding motor is precisely controlled through the bridge MOS transistor structure, so as to adjust the selection direction of the winding motor and further adjust the duty cycle to achieve linear adjustment of the motor speed, thereby avoiding abnormal noise caused by the fast impact of the uniformly moving curtain on the sunroof beam, and improving driving comfort. (2) Accurately detect motor speed through ripple acquisition sub-circuit. This circuit cleverly extracts the ripple signal reflecting commutator switching (which corresponds strictly to the speed) from the motor operating current. After I / V conversion, level boosting and differential amplification, it is sent to the controller's timer for counting. (3) Using ripple acquisition instead of traditional sensors: Compared to using additional speed / position sensors such as Hall sensors or photoelectric encoders, speed detection is performed using the ripple signal in the motor's own operating current, eliminating the need for additional hardware sensors; The ripple signal is usually weak and superimposed on a large DC component and noise. After I / V conversion, the design of the bias circuit unit and differential amplifier unit effectively filters out common-mode noise (such as power supply noise and ground interference), significantly improving the signal-to-noise ratio and detection reliability of the weak ripple signal, ensuring accurate counting. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This utility model provides a circuit diagram of a sunshade driving circuit, a sunroof sunshade device, and a car circuit structure. Figure 2This is a circuit diagram of a sunshade driving circuit, a sunroof sunshade device, and a ripple acquisition sub-circuit for automobiles according to the present invention. Figure 3 This is a schematic diagram of a sunshade curtain drive circuit, a sunroof sunshade curtain device, and the duty cycle adjustment of the PWM drive signal for a car, according to the present invention. Figure 4 This is a perspective view of a sunshade driving circuit, a sunroof sunshade device, and a car sunshade according to the present invention. Detailed Implementation

[0020] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of the embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0021] When a hinged sunshade closes, it typically moves at a constant speed. This can cause the support rod to collide with the front or rear crossbeams of the sunroof, producing abnormal noise and affecting the driver's driving experience and comfort. Therefore, if... Figure 1 As shown, on one hand, this utility model provides a sunshade curtain driving circuit, including: Controller; A winding motor can be installed at the end of the flexible shaft to drive the rotation of the flexible shaft and the extension and retraction of the curtain fabric; The motor drive sub-circuit is electrically connected to the controller and is used to receive control signals from the controller and provide PWM drive signals to the winding motor to adjust the rotation direction and speed of the winding motor. The ripple acquisition sub-circuit is electrically connected to the winding motor and is used to acquire the ripple signal of the winding motor rotation. After preprocessing the ripple signal, it is sent to the timer port of the controller for ripple signal counting. The power conversion sub-circuit is electrically connected to the controller, motor drive sub-circuit, and ripple acquisition sub-circuit, respectively, to provide electrical energy.

[0022] The winding motor is usually a DC motor, and its operating voltage is directly related to the motor speed. By changing the duty cycle of the PWM drive signal, that is, the effective value of the winding motor's operating voltage, the winding motor speed can be significantly changed, thereby achieving the effect of speed regulation and avoiding abnormal noise caused by the support rod hitting the front or rear crossbeam of the sunroof quickly.

[0023] like Figure 1As shown, the motor drive sub-circuit includes an H-bridge driver U3, a bridge circuit sub-module, and a bridge power supply. The H-bridge driver U3 is electrically connected to the controller, and its output terminals are electrically connected one-to-one with the input terminals of the bridge circuit sub-module and the enable terminals of the bridge power supply. The output terminals of the bridge circuit sub-module are electrically connected to the winding motor. The H-bridge driver U3 is used to output PWM drive signals to the bridge circuit sub-module and the winding motor. The H-bridge driver U3 is also used to output enable signals to the bridge power supply to enable the bridge power supply to provide operating power to the bridge circuit sub-module.

[0024] Controller U1, i.e. Figure 1 The MCU in this system has limited TTL level driving capability of its own pins. Therefore, it is equipped with an H-bridge driver U3 to amplify the output signal of the controller U1, improve its load-carrying capacity, and generate the required PWM drive signals. These signals are then input into the bridge circuit submodule to control the rotation direction and speed of the winding motor. The bridge circuit submodule is essentially an H-shaped bridge structure composed of four MOSFETs.

[0025] Specifically, such as Figure 1 As shown, the bridge circuit module includes a second MOSFET Q2, a third MOSFET Q3, a fourth MOSFET Q4, and a fifth MOSFET Q5. The H-bridge driver U3 includes several first signal output terminals, which are electrically connected to the gates of the second MOSFET Q2, the third MOSFET Q3, the fourth MOSFET Q4, and the fifth MOSFET Q5, respectively. The drains of the second MOSFET Q2 and the fourth MOSFET Q4 are electrically connected to the output terminals of the bridge power supply, and the sources of the third MOSFET Q3 and the fifth MOSFET Q5 are both grounded. The source of the second MOSFET Q2 is electrically connected to the drain of the third MOSFET Q3 and serves as the first output terminal of the bridge circuit module. The source of the fourth MOSFET Q4 is electrically connected to the drain of the fifth MOSFET Q5 and serves as the second output terminal of the bridge circuit module. The first and second output terminals are electrically connected to the winding motor, respectively, to output PWM drive signals to the winding motor and adjust the rotation direction and speed of the winding motor. The gate symbol for each MOSFET is G, the source symbol is S, and the drain symbol is D. The PWM drive signal is essentially a switching signal. The second MOSFET Q2, the third MOSFET Q3, the fourth MOSFET Q4, and the fifth MOSFET Q5 are essentially high-speed switches. By rapidly turning on or off the combination of MOSFETs, the reference direction and effective value of the voltage applied to the winding motor M are changed.

[0026] like Figure 1As shown, the second MOSFET Q2 and the third MOSFET Q3 form complementary channels, and the fourth MOSFET Q4 and the fifth MOSFET Q5 form complementary channels, allowing the two diagonal MOSFETs to conduct and turn off simultaneously. When the PWM drive signal is high, the second MOSFET Q2 and the fifth MOSFET Q5 conduct simultaneously, while the third MOSFET Q3 and the fourth MOSFET Q4 are both off. The second MOSFET Q2, the winding motor M, and the fifth MOSFET Q5 form a circuit, and at this time, the winding motor M rotates forward, allowing the sunshade to unfold. When the PWM drive signal is low, the second MOSFET Q2 and the fifth MOSFET Q5 are both off, while the third MOSFET Q3 and the fourth MOSFET Q4 conduct simultaneously. The fourth MOSFET Q4, the winding motor M, and the third MOSFET Q3 form a circuit, and at this time, the winding motor M rotates in reverse, allowing the sunshade to retract.

[0027] like Figure 1 As shown, the bridge power supply includes a first MOSFET Q1, a tenth resistor R10, a ninth resistor R9, and a Zener diode Z1. The output terminal of the H-bridge driver U3 is electrically connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is electrically connected to the gate of the first MOSFET Q1. The source of the first MOSFET Q1 is electrically connected to the vehicle power supply. The source of the first MOSFET Q1 is electrically connected to one end of the ninth resistor R9 and the anode of the Zener diode Z1. The other end of the ninth resistor R9 and the cathode of the Zener diode Z1 are both electrically connected to the gate of the first MOSFET Q1. The drain of the first MOSFET Q1 serves as the output terminal of the bridge power supply. The output terminal of the H-bridge driver U3 outputs a high level, enabling the first MOSFET Q1. After the first MOSFET Q1 is turned on, it provides operating power to the bridge circuit submodule. The Zener diode Z1 is used to limit the maximum voltage between the gate and source of the first MOSFET Q1, and the ninth resistor R9 is used for electrostatic discharge. When the gate voltage of the first MOSFET Q1 is higher than the source voltage, the first MOSFET Q1 is turned on, and the operating power supply +12V is applied to the drain of the second MOSFET Q2 and the drain of the fourth MOSFET Q4.

[0028] The tenth resistor R10 serves as a current limiter. The first MOSFET Q1 has a large gate-source capacitance. To prevent gate malfunction and gate-source damage, a ninth resistor R9 is provided for electrostatic discharge. A Zener diode Z1 is connected in reverse parallel between the gate and source of the first MOSFET Q1 to limit the gate-source voltage and prevent permanent damage to the gate oxide layer.

[0029] like Figure 1 Combination Figure 2As shown, the ripple acquisition sub-circuit includes an I / V conversion unit, a bias circuit unit, and a differential amplifier unit. The input terminal of the I / V conversion unit is electrically connected to the winding motor. The output terminal of the I / V conversion unit is electrically connected to the non-inverting input terminal of the differential amplifier unit and the input terminal of the bias circuit unit, respectively. The output terminal of the bias circuit unit is electrically connected to the inverting input terminal of the differential amplifier unit. The output terminal of the differential amplifier unit is electrically connected to the timer port of the controller.

[0030] Specifically, the I / V conversion unit includes a first resistor R1, a second resistor R2, and a first capacitor C1. One end of the first resistor R1 is electrically connected to the winding motor and one end of the second resistor R2, respectively. The other end of the second resistor R2 serves as the output terminal of the I / V conversion unit and is electrically connected to one end of the first capacitor C1, the input terminal of the bias circuit unit, and the non-inverting input terminal of the differential amplifier unit, respectively. The other ends of the first resistor R1 and the first capacitor C1 are grounded. The I / V conversion unit is used to convert the acquired current signal of the winding motor into a voltage signal.

[0031] The bias circuit unit includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a second capacitor C2. One end of the third resistor R3 serves as the input terminal of the bias circuit unit. The other end of the third resistor R3 is electrically connected to one end of the fourth resistor R4, one end of the fifth resistor R5, and one end of the sixth resistor R6, respectively. The other end of the fourth resistor R4 is electrically connected to the output terminal of the power conversion sub-circuit. The other end of the sixth resistor R6 is electrically connected to the other input terminal of the differential amplifier unit and one end of the second capacitor C2, respectively. The other end of the fifth resistor R5 and the other end of the second capacitor C2 are grounded. The other end of the sixth resistor R6 serves as the output terminal of the bias circuit unit. The bias circuit unit boosts the voltage signal input from the I / V conversion unit and sends it to the differential amplifier unit.

[0032] Since the sampling signal obtained by the I / V conversion unit is relatively weak, one path is directly sent to the differential amplifier unit, and the other path is directly boosted by the bias circuit unit. Specifically, it is determined by the voltage division of the fourth resistor R4 and the fifth resistor R5, with a voltage division ratio of R4 / (R4+R5).

[0033] The differential amplifier unit includes an operational amplifier, a seventh resistor R7, and an eighth resistor R8. The non-inverting input of the operational amplifier is electrically connected to the output of the I / V conversion unit. One end of the seventh resistor R7 is electrically connected to the output of the bias circuit unit, and the other end of the seventh resistor R7 is electrically connected to the inverting input of the operational amplifier and one end of the eighth resistor R8. The other end of the eighth resistor R8 is electrically connected to the output of the operational amplifier, and the output of the operational amplifier is electrically connected to the timer port of the controller.

[0034] The differential amplifier unit constructs a differential feedback amplifier circuit with an amplification ratio of -(R8 / R7). The resistance values ​​of the seventh resistor R7 and the eighth resistor R8 can be set as needed, but the amplified voltage cannot exceed the input level limit of the controller's timer port.

[0035] For counting rising edges, the controller can use GPIO interrupts. The principle is to use the rising or falling edge of the GPIO port to trigger an interrupt; the number of interrupts corresponds to the number of pulses. This can be achieved simply by counting within the interrupt service function. Alternatively, the GPIO port's multiplexed timer function can be used to count external pulses. When the count reaches a certain number of rising edges (e.g., the number of pulses corresponding to 2-3 seconds of forward or reverse rotation of the winding motor), the H-bridge driver U3 changes the duty cycle of the PWM drive signal. Figure 3 As shown, the waveforms in the diagram correspond to PWM drive signals with duty cycles of 25%, 50%, and 75%. The higher the duty cycle, the higher the corresponding effective voltage value and the higher the speed of the winding motor. The lower the duty cycle, the lower the corresponding effective voltage value and the lower the speed of the winding motor. Therefore, the force of the collision between the curtain and the front or rear crossbeam of the sunroof after the speed is reduced is extremely small, and the probability of noise is also reduced.

[0036] like Figure 1 As shown, the power conversion sub-circuit includes an LDO chip U1. The input terminal of the LDO chip U1 is electrically connected to the vehicle power supply. The voltage signal VOUT1 output by the output terminal of the LDO chip is electrically connected to the controller, the motor drive sub-circuit, and the ripple acquisition sub-circuit, respectively powering the controller U1, the H-bridge driver U3 of the motor drive sub-circuit, and the voltage boosting of the bias circuit unit.

[0037] The following is a description of the overall working process of the circuit of this utility model: After the device is started, the power conversion sub-circuit works, and the LDO chip U1 outputs a voltage signal VOUT1 to the H-bridge driver U3 of the controller and motor drive sub-circuit. The H-bridge driver U3 enables the first MOSFET Q1 of the bridge power supply, and the working power supply +12V is applied to the drain of the second MOSFET Q2 and the drain of the fourth MOSFET Q4. When the sunshade needs to be raised, the H-bridge driver U3 inputs the PWM drive signal to the second MOSFET Q4 and the fifth MOSFET Q5 as switching signals. At this time, the direction of the electrical signal flow is through the second MOSFET Q2, the winding motor M, and the fifth MOSFET Q5. The winding motor rotates forward, and at the same time, the ripple acquisition sub-circuit acquires the ripple signal when the winding motor M is working. After performing I / V conversion, level boosting, and differential amplification on the ripple signal, the resulting pulse signal is sent to the timer port of the controller U1. The timer port counts the rising edges of the pulse signal. When the number of rising edges of the pulses reaches a certain number, it is considered that the sunshade has reached the buffer start position for opening. At this time, the H-bridge driver U3 reduces the duty cycle of the PWM drive signal input to the second MOSFET Q4 and the fifth MOSFET Q5, and reduces the speed of the winding motor M, so that the force of the curtain colliding with the front beam of the sunroof is reduced, thereby reducing the possibility of noise. During this process, the third MOSFET Q3 and the fourth MOSFET Q4 are always turned off.

[0038] Conversely, when retracting the unfolded sunshade, the H-bridge driver U3 inputs PWM drive signals to the third MOSFET Q3 and the fourth MOSFET Q4 as switching signals. At this time, the electrical signal flows through the fourth MOSFET Q4, the winding motor M, and the third MOSFET Q3. The winding motor reverses direction, and the ripple acquisition sub-circuit acquires the ripple signal when the winding motor M is working. After I / V conversion, level boosting, and differential amplification of the ripple signal, the resulting pulse signal is sent to the timer port of the controller U1. The timer port counts the rising edges of the pulse signal. When the number of rising edges reaches a certain number, it is considered that the sunshade has reached the buffer start position for retraction. At this time, the H-bridge driver U3 reduces the duty cycle of the PWM drive signals input to the third MOSFET Q3 and the fourth MOSFET Q4, reducing the speed of the winding motor M, thereby reducing the force of the collision between the curtain and the rear beam of the skylight, thus reducing the possibility of noise. During this process, the second MOSFET Q2 and the fifth MOSFET Q5 are always turned off.

[0039] like Figure 4 As shown, on the other hand, this utility model provides a skylight sunshade device, which is equipped with the above-mentioned sunshade drive circuit to make the movement speed of the curtain adjustable; one end of the curtain is fixed to the support rod, and the support rod moves synchronously with the curtain under the drive of the winding motor.

[0040] The support rod is also equipped with vibration damping material, which can further reduce the force and noise of the collision between the curtain, support rod and the front or rear crossbeam of the sunroof, thereby improving the driving experience.

[0041] Thirdly, this utility model provides a car that includes the aforementioned sunroof sunshade device.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A driving circuit for a sunshade curtain, characterized in that, include: Controller; The winding motor is used to drive the rotation of the flexible shaft and the extension and retraction of the curtain fabric; The motor drive sub-circuit is electrically connected to the controller and is used to receive control signals from the controller and provide PWM drive signals to the winding motor to adjust the rotation direction and speed of the winding motor. The ripple acquisition sub-circuit is electrically connected to the winding motor and is used to acquire the ripple signal of the winding motor rotation. After preprocessing the ripple signal, it is sent to the timer port of the controller for ripple signal counting. The power conversion sub-circuit is electrically connected to the controller, motor drive sub-circuit, and ripple acquisition sub-circuit, respectively, to provide electrical energy.

2. The sunshade curtain driving circuit according to claim 1, characterized in that, The motor drive sub-circuit includes an H-bridge driver U3, a bridge circuit sub-module, and a bridge power supply. The H-bridge driver U3 is electrically connected to the controller, and its output terminals are electrically connected one-to-one with the input terminals of the bridge circuit sub-module and the enable terminals of the bridge power supply. The output terminals of the bridge circuit sub-module are electrically connected to the take-up motor. The H-bridge driver U3 is used to output PWM drive signals to the bridge circuit sub-module and the take-up motor. The H-bridge driver U3 is also used to output enable signals to the bridge power supply to enable the bridge power supply to provide operating power to the bridge circuit sub-module.

3. The sunshade curtain driving circuit according to claim 2, characterized in that, The bridge circuit submodule includes a second MOSFET Q2, a third MOSFET Q3, a fourth MOSFET Q4, and a fifth MOSFET Q5. The H-bridge driver U3 includes several first signal output terminals, which are electrically connected to the gates of the second MOSFET Q2, the third MOSFET Q3, the fourth MOSFET Q4, and the fifth MOSFET Q5, respectively. The drains of the second MOSFET Q2 and the fourth MOSFET Q4 are electrically connected to the output terminals of the bridge power supply, and the sources of the third MOSFET Q3 and the fifth MOSFET Q5 are both grounded. The source of the second MOSFET Q2 is electrically connected to the drain of the third MOSFET Q3 and serves as the first output terminal of the bridge circuit module. The source of the fourth MOSFET Q4 is electrically connected to the drain of the fifth MOSFET Q5 and serves as the second output terminal of the bridge circuit module. The first and second output terminals are electrically connected to the winding motor, respectively, to output PWM drive signals to the winding motor and adjust the rotation direction and speed of the winding motor.

4. The sunshade curtain driving circuit according to claim 2, characterized in that, The bridge power supply includes a first MOSFET Q1, a tenth resistor R10, a ninth resistor R9, and a Zener diode Z1. The output terminal of the H-bridge driver U3 is electrically connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is electrically connected to the gate of the first MOSFET Q1. The source of the first MOSFET Q1 is electrically connected to the vehicle power supply. The source of the first MOSFET Q1 is electrically connected to one end of the ninth resistor R9 and the anode of the Zener diode Z1. The other end of the ninth resistor R9 and the cathode of the Zener diode Z1 are both electrically connected to the gate of the first MOSFET Q1. The drain of the first MOSFET Q1 serves as the output terminal of the bridge power supply. The output terminal of the H-bridge driver U3 outputs a high level, enabling the first MOSFET Q1. After the first MOSFET Q1 is turned on, it provides operating power to the bridge circuit submodule. The Zener diode Z1 is used to limit the maximum voltage between the gate and source of the first MOSFET Q1, and the ninth resistor R9 is used for electrostatic discharge.

5. A sunshade curtain driving circuit according to claim 1, characterized in that, The ripple acquisition sub-circuit includes an I / V conversion unit, a bias circuit unit, and a differential amplifier unit. The input terminal of the I / V conversion unit is electrically connected to the winding motor. The output terminal of the I / V conversion unit is electrically connected to the non-inverting input terminal of the differential amplifier unit and the input terminal of the bias circuit unit, respectively. The output terminal of the bias circuit unit is electrically connected to the inverting input terminal of the differential amplifier unit. The output terminal of the differential amplifier unit is electrically connected to the timer port of the controller.

6. A sunshade curtain driving circuit according to claim 5, characterized in that, The I / V conversion unit includes a first resistor R1, a second resistor R2, and a first capacitor C1. One end of the first resistor R1 is electrically connected to the winding motor and one end of the second resistor R2. The other end of the second resistor R2 serves as the output terminal of the I / V conversion unit and is electrically connected to one end of the first capacitor C1, the input terminal of the bias circuit unit, and the non-inverting input terminal of the differential amplifier unit. The other ends of the first resistor R1 and the first capacitor C1 are grounded. The I / V conversion unit is used to convert the acquired current signal of the winding motor into a voltage signal.

7. A sunshade curtain driving circuit according to claim 5, characterized in that, The bias circuit unit includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a second capacitor C2. One end of the third resistor R3 serves as the input terminal of the bias circuit unit. The other end of the third resistor R3 is electrically connected to one end of the fourth resistor R4, one end of the fifth resistor R5, and one end of the sixth resistor R6, respectively. The other end of the fourth resistor R4 is electrically connected to the output terminal of the power conversion sub-circuit. The other end of the sixth resistor R6 is electrically connected to the other input terminal of the differential amplifier unit and one end of the second capacitor C2, respectively. The other end of the fifth resistor R5 and the other end of the second capacitor C2 are grounded. The other end of the sixth resistor R6 serves as the output terminal of the bias circuit unit. The bias circuit unit boosts the voltage signal input from the I / V conversion unit and sends it to the differential amplifier unit.

8. A sunshade curtain driving circuit according to claim 5, characterized in that, The differential amplifier unit includes an operational amplifier, a seventh resistor R7, and an eighth resistor R8. The non-inverting input of the operational amplifier is electrically connected to the output of the I / V conversion unit. One end of the seventh resistor R7 is electrically connected to the output of the bias circuit unit, and the other end of the seventh resistor R7 is electrically connected to the inverting input of the operational amplifier and one end of the eighth resistor R8. The other end of the eighth resistor R8 is electrically connected to the output of the operational amplifier, and the output of the operational amplifier is electrically connected to the timer port of the controller.

9. A skylight sunshade device, characterized in that, The curtain is equipped with a driving circuit as described in any one of claims 1-8, which allows the speed of the curtain movement to be adjustable; one end of the curtain is fixed to a support rod, and the support rod moves synchronously with the curtain under the drive of a winding motor.

10. A car, characterized in that, Includes the skylight sunshade device as described in claim 9.

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