Control circuit for skylight brushless motor

Abstract

The utility model relates to the technical field of motor control circuits, in particular to a control circuit for a skylight brushless motor, which comprises a three-phase current acquisition circuit, a power voltage acquisition circuit, a temperature acquisition circuit, a Hall encoder acquisition circuit, an MOS (metal oxide semiconductor) tube switching circuit and a sleep wake-up circuit. The MOS tube switching circuit is used for controlling the on and off of six MOS tubes through a chip and controlling the rotation of the brushless motor; the sleep wake-up circuit is used for the whole working circuit, a power supply voltage acquisition circuit is established, the power supply voltage acquisition circuit is used for supplying power to each circuit, the temperature acquisition circuit is used for acquiring a Lin signal in the operation process of the motor and feeding back the Lin signal to the ECU, the ECU stops working of the motor when being overheated, the three-phase current acquisition circuit is used for acquiring current, and the power supply voltage acquisition circuit is used for supplying power to each circuit. The Hall encoder acquisition circuit is used for assisting software in acquiring the number of Hall elements so as to further judge the position of the skylight. The control circuit reduces the noise and saves the power consumption of the system at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of motor control circuits, in particular to a control circuit for a skylight brushless motor. Background Technique

[0002] The electric skylight of an automobile is realized through a precise mechanical and electronic control system. Its working principle involves multiple links such as the drive of the motor, the power transmission of the transmission system, the guidance of the sliding mechanism, and the logical operation of the control system. With the progress of technology and the improvement of consumer demands, the performance and functions of electric skylights are also continuously improved. In the prior art, most of the drives of automobile skylights use brushed motors, which can achieve various performances and functions of the skylight. The defect is that the noise is too large and the user experience is uncomfortable. If a brushless motor is used, however, a very precise control circuit is required to cooperate for control. In view of this, we propose a control circuit for a skylight brushless motor. Content of the Utility Model

[0003] The purpose of the utility model is to provide a control circuit for a skylight brushless motor to solve the problems raised in the above background technique. It makes the noise very small during the movement of the skylight. At the same time, the skylight can use a sleep wake-up circuit for working wake-up. When the motor is not in use, the overall circuit of the skylight is in a sleep state, saving the power consumption of the system.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A control circuit for a skylight brushless motor includes a three-phase current acquisition circuit, a power supply voltage acquisition circuit, a temperature acquisition circuit, a Hall encoder acquisition circuit, a MOS tube switch circuit, and a sleep wake-up circuit;

[0006] The MOS tube switch circuit is used to control the closing and opening of 6 MOS tubes through a chip to control the rotation of the brushless motor;

[0007] The sleep wake-up circuit is used for the entire working circuit, and at the same time, a power supply voltage acquisition circuit is established. The power supply voltage acquisition circuit is used to supply power to each circuit. The temperature acquisition circuit is used to collect the Lin signal during the operation of the motor and feedback it to the ECU. The ECU will stop the operation of the motor when it is overheated. The three-phase current acquisition circuit is used to collect current, and the Hall encoder acquisition circuit is used to assist the software to collect the number of Hall elements to further judge the position of the skylight.

[0008] Further, the MOS transistor switch circuit includes a driving chip, and the driving chip includes a VB pin, a VS pin, a HO pin, and a LO pin. The VB pin is the gate driving voltage of the high-side MOSFET, the VS pin is the source voltage of the high-side MOSFET, the HO pin is the high-side gate driving output, which drives the MOS transistor Q1 through the resistor R14. The LO pin is the low-side gate driving output, which drives the low-side MOS transistor Q2 through the resistor R15. The MOS transistor Q1 is the upper-bridge MOSFET, and its switching is controlled by the high-side driving signal HO of the driving chip. The source of the upper bridge is connected to the load side of the motor. The MOS transistor Q2 is the lower-bridge MOSFET, and the conduction and cutoff of the lower bridge are controlled by LO, and the source is grounded. The resistors R14 and R15 are gate driving resistors, which limit the charging and discharging current of the MOSFET gate. It also includes anti-reverse diodes D2 and D6 for protecting the MOS transistors Q1 and Q2.

[0009] Further, the MOS transistor switch circuit also includes two optocouplers, which are respectively used for isolating the signals of the upper bridge and the lower bridge. The input ends of the two optocouplers receive PWM signals and are respectively connected to two current-limiting resistors R1 and R5. The output ends of the optocouplers are connected to the input ends of the driving chip, respectively controlling the switching of the high end and the low end.

[0010] Further, after the Hall encoder acquisition circuit is connected to the three-phase windings of the motor, it is respectively connected to pull-up resistors R104, R105, and R107 and then outputs three Hall sensor signals HALLW, HALLV, and HALLU, representing different state signals of the sunroof position. It also includes resistors R108, R109, and R110, which are used to connect the ENCZ, ENCB, and ENCA signals of the encoder to the input port of the encoder, protecting the encoder chip through voltage division and current limiting to ensure the stability of the input signal. It also includes Schottky diodes D19, D20, and D21, which are respectively connected to the output signals HALLW, HALLV, and HALLU of the Hall sensors, and the cathodes of the Schottky diodes D19, D20, and D21 are respectively connected to R104, R105, and R107.

[0011] Further, the three-phase current acquisition circuit is powered by the power supply POWER to provide the main voltage to drive the motor and the circuit to work. The MOS transistors Q1 and Q2 control their conduction and cutoff to achieve the current regulation of the motor. It includes current detection resistors R17 and R18. The resistors R17 and R18 collect current signals and generate a voltage signal DIVU proportional to the current. The three-phase current acquisition circuit further includes an amplification circuit. The amplification circuit includes a comparator. The comparator is used to amplify the collected current signal. The input end of the comparator is connected to the collected voltage signal DIVU, and the gain is adjusted through resistors R13 and R14. The resistor R11 is used as the reference voltage to set the reference level of the comparator to ensure that the circuit can correctly amplify the collected signal.

[0012] Further, the power supply voltage acquisition circuit is powered by the power supply POWER and VCC3.3. It also includes a voltage divider composed of resistors R112, R113, and R115. The voltage divider reduces the voltage POWER to a smaller voltage for measurement. It also includes an operational amplifier U17A. The positive input end of the operational amplifier U17A is connected to the output of the voltage divider. The negative input end of the operational amplifier U17A is directly connected to its output end. The power supply pin of the operational amplifier U17A is connected to VCC3.3.

[0013] Further, the temperature acquisition circuit is powered by VCC3.3. It includes an NTC thermistor, a resistor R122, a capacitor C89, an operational amplifier U17B, a diode VD11, and a PESD. The NTC thermistor and the resistor R122 together form a voltage division network for measuring temperature changes. One end of the NTC thermistor is connected to VCC3.3, and the other end is connected to the input of the resistor R122 and the operational amplifier U17B. The other end of the resistor R122 is grounded. One end of the capacitor C89 is connected to the common node of the NTC thermistor and R122, and the other end is grounded. The positive input end of the operational amplifier U17B is connected to the common node of the NTC thermistor and R122. The negative input end of the operational amplifier U17B is connected to its output end to form a voltage follower. The output end VTEMP is used as the output of the temperature acquisition signal. The power supply pin of the operational amplifier U17B is connected to VCC3.3, and the ground pin is grounded. One end of the diode VD11 and the PESD is connected to the output end VTEMP of the operational amplifier U17B, and the other end is grounded.

[0014] Further, the sleep wake-up circuit includes diodes D1 and D2 connected to the input ends of wake-up signal 1 and wake-up signal 2. Wake-up signal 1 is connected to resistor R1 through diode D2, and wake-up signal 2 is connected to the same node through diode D1. It also includes capacitor C1. One end of capacitor C1 is connected to the ground, and the other end is connected to the connection point between the input end of wake-up signal 2 and D1. It further includes resistors R1 and R2. Resistor R1 is connected between the common node after diodes D1 and D2 and the wake-up signal, and resistor R2 is connected between the output end of resistor R1 and the ground, forming a voltage divider structure.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: The present utility model controls the skylight through a brushless motor and a precise circuit. The skylight makes very little noise during movement, meeting the requirement of less than 35 dB. At the same time, the skylight can use the sleep wake-up circuit to wake up for work. When the motor is not in use, the overall circuit of the skylight is in a sleep state, saving the power consumption of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0017] Figure 1 It is the three-phase current acquisition circuit diagram of the present utility model;

[0018] Figure 2 It is the power supply voltage acquisition circuit diagram of the present utility model;

[0019] Figure 3 It is the temperature acquisition circuit diagram of the present utility model;

[0020] Figure 4 It is the Hall encoder acquisition circuit diagram of the present utility model;

[0021] Figure 5 It is the MOS transistor switch circuit diagram of the present utility model;

[0022] Figure 6 It is the sleep wake-up circuit diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions, and advantages of the present utility model clearer, the following will elaborate on each embodiment of the present utility model in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in each embodiment of the present utility model, many technical details are provided to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in each claim of the present application can still be implemented.

[0024] The technical solutions of the present utility model are further described through the following embodiments:

[0025] A control circuit for a skylight brushless motor includes a three-phase current acquisition circuit, a power supply voltage acquisition circuit, a temperature acquisition circuit, a Hall encoder acquisition circuit, a MOS transistor switch circuit, and a sleep wake-up circuit;

[0026] The MOS transistor switch circuit is used to control the closing and opening of six MOS transistors through a chip to control the rotation of the brushless motor;

[0027] The sleep wake-up circuit is used for the entire working circuit, and at the same time, a power supply voltage acquisition circuit is established. The power supply voltage acquisition circuit is used to supply power to each circuit. The temperature acquisition circuit is used to collect the Lin signal during the operation of the motor and feedback it to the ECU. When it is overheated, the ECU will stop the operation of the motor. The three-phase current acquisition circuit is used to collect current. The Hall encoder acquisition circuit is used to assist the software in collecting the number of Hall elements to further determine the position of the skylight.

[0028] Specifically, in this embodiment, the rotation of the brushless motor is further controlled by controlling the closing and opening of six MOS transistors. Specifically, the polarity is switched through a three-phase inverter circuit, the speed is adjusted by controlling the PWM duty cycle of the upper bridge arm, and the power is supplied in the order set by the position sensor. First, the entire working circuit is awakened through the sleep wake-up circuit. The working principle is that sending a corresponding signal can make the circuit sleep and wake up. At the same time, a power supply voltage acquisition circuit is established to supply power to the circuits of each module. During the operation of the motor, there is a possibility of triggering thermal protection because being in an overheated state all the time is harmful to the motor. Therefore, a temperature acquisition circuit is needed to collect the corresponding Lin signal, and the collected temperature is fed back to the ECU. When it is overheated, the operation of the motor will stop. The three-phase current acquisition circuit is used to collect current. During the initialization process of the skylight, it will hit a hard stop point. At this time, the current is different from the current during normal operation. The software will judge whether the skylight hits the hard stop point based on the differential of the current with respect to time. Therefore, a three-phase current acquisition circuit is needed, and the Hall encoder circuit is used to assist the software in collecting the number of Hall elements to further determine the position of the skylight.

[0029] Figure 5The MOS transistor turn-off circuit is described. When the voltage between GS > 7V, the MOS transistor is fully conducting. In the drive circuit, the turn-off situation of the upper bridge arm is judged. When HO conducts, HO = VB, then a voltage of 11V of VC11 is obtained at G and it turns on; after turning on, a POWER power supply is obtained at S, that is, the 24V voltage will be connected to C through the circuit. This capacitor charges it and connects back to VB, and VB = HO = the potential at G, so there is always a potential difference of 11V between GS, maintaining the conduction of the MOS transistor.

[0030] Specifically, the MOS transistor switching circuit includes a drive chip IR2110S. The drive chip IR2110S includes a VB pin, a VS pin, a HO pin, and a LO pin. The VB pin is the gate drive voltage of the high-side MOSFET. The VS pin is the source voltage of the high-side MOSFET. The HO pin is the high-side gate drive output, driving the MOS transistor Q1 through the resistor R14. The LO pin is the low-side gate drive output, driving the low-side MOS transistor Q2 through the resistor R15. The MOS transistor Q1 is the upper-bridge-arm MOSFET, and its switching is controlled by the high-side drive signal HO of the drive chip IR2110S. The source of the upper bridge arm is connected to the load side of the motor. The MOS transistor Q2 is the lower-bridge-arm MOSFET, and the conduction and turn-off of the lower bridge arm are controlled by LO, and the source is grounded. The resistors R14 and R15 are gate drive resistors, limiting the charge and discharge current of the MOSFET gate. It also includes reverse protection diodes D2 and D6 for protecting the MOS transistors Q1 and Q2. The power supply part provides different power supply voltages for the drive chip IR2110S and Q1, Q2 through VCC5.5 and VCC11 respectively. The logic power supply of the drive chip IR2110S is VCC5.5, while the gate drive power supply of the MOS transistors Q1 and Q2 is VCC11. The resistors R7 and R9 are used for current detection, especially for detecting the current flowing through the MOSFET through R7 and R9, and realizing the protection function through the subsequent circuit. R17 and R18 are precision sampling resistors for measuring the current flowing through the circuit. When the upper-bridge-arm MOS transistor Q1 conducts, the capacitor C9 obtains energy from the POWER power supply terminal and charges. This provides support for the MOS transistor to maintain stable conduction. D3 is a zener diode for stabilizing the voltage of C9 within a certain range to prevent excessive voltage from damaging circuit components.

[0031] The MOS transistor switch circuit further includes two optocouplers TLP2355, which are respectively used for isolating the signals of the upper bridge arm and the lower bridge arm. The input ends of the two optocouplers TLP2355 receive PWM signals and are respectively connected to two current-limiting resistors R1 and R5. The output ends of the optocoupler TLP2355 are connected to the input ends of the drive chip to respectively control the switches of the high side and the low side. Capacitors C8 and C18 are used to filter out high-frequency noise in the input signal. R8 and R10 are pull-down resistors to prevent the optocoupler output from floating.

[0032] As Figure 4 , after the Hall encoder acquisition circuit is connected to the three-phase windings of the motor, it is respectively connected to pull-up resistors R104, R105, and R107 and then outputs three Hall sensor signals HALLW, HALLV, and HALLU, representing different status signals of the sunroof position. The Hall sensor will generate different voltage signals according to the magnetic field change to reflect the current position. It also includes resistors R108, R109, and R110, which are used to connect the ENCZ, ENCB, and ENCA signals of the encoder to the input port of the encoder to protect the encoder chip through voltage division and current limiting to ensure the stability of the input signal. It also includes Schottky diodes D19, D20, and D21, which are respectively connected to the output signals HALLW, HALLV, and HALLU of the Hall sensor, and the cathodes of the Schottky diodes D19, D20, and D21 are respectively connected to R104, R105, and R107 to prevent reverse current from damaging the circuit and protect the Hall signal line from high voltage or reverse voltage. The sensor supply voltage can be selected as 5V / 11V. Filter capacitors C7, C8, and C9 are used to filter the Hall sensor signals to eliminate high-frequency noise to ensure that the signals transmitted to the encoder are more stable and accurate. Capacitors C81, C82, and C83 cooperate with the current-limiting resistors, and these capacitors are used to further filter the encoder input signal to ensure that the signal received by the encoder is accurate and reduce interference. VENC is the encoder supply voltage, which provides the power required for the encoder to work. C80 is used to filter the encoder supply voltage to ensure the stability of the power supply and prevent the encoder from malfunctioning due to power supply noise. The encoder chip obtains the position signals of the Hall sensor through these three pins ENCZ, ENCB, and ENCA, and the software judges the position and movement status of the sunroof through these signals. After being processed by the previous current-limiting resistors and filter capacitors, these signal inputs can be transmitted to the encoder chip more stably.

[0033] The three-phase current acquisition circuit is powered by POWER to provide the main voltage, driving the motor and the circuit to work. The MOS transistors Q1 and Q2 control their conduction and cutoff to achieve current regulation of the motor. It includes current detection resistors R17 and R18. The resistors R17 and R18 collect current signals and generate a voltage signal DIVU proportional to the current. The three-phase current acquisition circuit also includes an amplification circuit, which includes a comparator. The comparator is used to amplify the collected current signal. The input signal is filtered and divided by resistors R13, R14 and capacitors C14, C16 and then sent to the operational amplifier. R25 and R26 are used to set the amplification factor, and R22 is used for feedback and stabilizing the output of the operational amplifier. The input terminal of the comparator is connected to the collected voltage signal DIVU, and the gain is adjusted through resistors R13 and R14. The resistor R11 is used as the reference voltage to set the reference level of the comparator, ensuring that the circuit can correctly amplify the collected signal. Capacitors C12 and C9 are used for filtering to reduce the current fluctuations and power supply ripples generated during the operation of the motor, thereby providing a stable current sampling environment. Resistors R7 and R9 further transfer the collected current signal to the subsequent voltage detection section. The diode D3 is used to prevent reverse current and protect the sensitive components in the circuit. After the current signal is amplified, the capacitor C19 is used to filter out the high-frequency interference in the signal to ensure the signal is stable. Diodes D4 and VD1 are used to protect the circuit and prevent reverse voltage from damaging the operational amplifier or other components.

[0034] Figure 1 On the left side of the circuit, from top to bottom, there is POWER, the control circuit leading to the motor working circuit, and the circuit part leading to the I-V power supply voltage acquisition circuit. The sampled voltage I_V = 0.02 * actual current I is obtained. The right-side partial diagram shows the circuit for collecting the actual current. The comparator A provides the amplification mechanism of the circuit. The sampled voltage is amplified, and the amplification factor = 12 / (1 + 1) = 6 times. The reference voltage is 1.25V, which is used to boost the voltage. Finally, the output voltage AMP_IU = (6 * 0.02Ω * I) + 1.25V. The actual current I = (output voltage - 1.25) / 0.12A is calculated by collecting the output voltage.

[0035] The power supply voltage acquisition circuit is powered by POWER and VCC3.3. Among them, POWER is the power supply voltage to be measured, and VCC3.3 is the reference voltage supplied to the circuit, which is used for the operation of operational amplifier U17A and other components. It also includes a voltage divider composed of resistors R112, R113, and R115. The voltage divider reduces the voltage POWER to a smaller voltage for measurement. The voltage division ratio is 1 / (12 + 12 + 1), indicating that the resistance values of R112 and R113 are equal and both are 12 times the unit, while R115 is 1 times the unit (for example, 12kΩ and 1kΩ). Therefore, the voltage passing through this voltage division network is 1 / 25 of the POWER voltage. Assuming POWER is the input voltage, the voltage after voltage division is used as one of the inputs of the operational amplifier. The capacitor C84 is a 10μF capacitor, which plays a role in filtering to eliminate power supply noise or voltage fluctuations. The resistor R121 is the feedback resistor of the operational amplifier, which is used to maintain the voltage follower mode.

[0036] It also includes an operational amplifier U17A. The positive input terminal of the operational amplifier U17A is connected to the output of the voltage divider. The negative input terminal of the operational amplifier U17A is directly connected to the output terminal. The power supply pin of the operational amplifier U17A is connected to VCC3.3. The operational amplifier U17A uses LMV3588-VR. VBUS is the voltage after voltage division, equal to POWER*1 / (12 + 12 + 1), that is, VBUS = POWER / 25. Since the acquisition system reads VBUS, the actual power supply voltage POWER can be calculated by multiplying VBUS by 25. The formula is POWER = VBUS*25.

[0037] As Figure 2 shown, the circuit module is powered by the Power power supply and VCC3.3, undergoes voltage division, and the acquisition point voltage = POWER*1 / (12 + 12 + 1). The voltage follower circuit VBUS = POWER*1 / (12 + 12 + 1). The acquired output voltage is used to calculate the actual voltage POWER, POWER = VBUS*25. R121 is a feedback resistor, which is directly connected from the output to the negative input terminal to ensure that the output follows the input.

[0038] Figure 3 The temperature acquisition circuit in involves many components, such as an NCP18XH103F03RB NTC thermistor and an LMV358B-VR amplifier. The circuit performs voltage division processing, and the voltage after voltage division = 3.3V*4700 / (Rt + 4700). Using the voltage follower circuit, the voltage after voltage division = VTEMP, that is, VTEMP = 3.3V*4700 / (Rt + 4700). Acquire VTEMP, calculate the resistance value Rt of the thermistor at this time, and calculate the actual temperature value according to Rt.

[0039] The temperature acquisition circuit is powered by VCC3.3 and includes an NTC thermistor, resistor R122, capacitor C89, operational amplifier U17B, diode VD11, and PESD. The NTC thermistor and resistor R122 together form a voltage division network for measuring temperature changes. The output voltage of this voltage divider varies according to the resistance value of the NTC thermistor, and the output voltage VTEMP represents the current temperature state. One end of the NTC thermistor is connected to VCC3.3, the other end is connected to the input of resistor R122 and operational amplifier U17B, the other end of resistor R122 is grounded, one end of capacitor C89 is connected to the common node of the NTC thermistor and R122, and the other end is grounded for filtering, smoothing the voltage signal, eliminating noise or interference signals, and ensuring a more stable voltage input to the operational amplifier. The positive input terminal of operational amplifier U17B is connected to the common node of the NTC thermistor and R122. The negative input terminal of operational amplifier U17B is connected to its output terminal to form a voltage follower, and the output terminal VTEMP is used as the output of the temperature acquisition signal. The power supply pin of operational amplifier U17B is connected to VCC3.3, and the ground pin is grounded. One end of diode VD11 and PESD is connected to the output terminal VTEMP of operational amplifier U17B, and the other end is grounded. The operational amplifier U17B uses LMV358B-VR.

[0040] The voltage divider composed of the thermistor and the fixed resistor R122 divides the VCC3.3 voltage according to the resistance change of the thermistor, and the divided voltage depends on the current temperature. When the temperature rises, the resistance value of the thermistor decreases, and the divided voltage (VTEMP) also decreases. When the temperature drops, the resistance value of the thermistor increases, and the divided voltage (VTEMP) increases.

[0041] Figure 6 In the shown sleep and wake-up circuit, when the vehicle is not started, the sunroof is in a sleep state. At this time, the external power supply of the sunroof is constant power KL30, but all wake-up signals, such as KL15 being at a low level, the internal single-chip microcomputer is in a sleep or unpowered state, waiting for an external wake-up signal. Figure 6 In it, multiple wake-up signals achieve the function of wire-AND through switch diodes, and then are input to the wake-up source through simple resistor voltage division and current limiting. The wake-up source is a single-chip microcomputer. Among them, wake-up signal 2 is not used and is in a floating state; only wake-up signal 1 is used.

[0042] The sleep wake-up circuit includes diodes D1 and D2 connected to the input ends of wake-up signal 1 and wake-up signal 2. Wake-up signal 1 is connected to resistor R1 through diode D2, and wake-up signal 2 is connected to the same node through diode D1. It also includes capacitor C1. One end of the capacitor C1 is connected to the ground, and the other end is connected to the connection point between the input end of wake-up signal 2 and D1. C1 may play a filtering role in the circuit to eliminate the noise or transient voltage spikes on the wake-up signal line to prevent the wake-up circuit from being accidentally triggered. It also includes resistors R1 and R2. The resistor R1 is connected between the common node after diodes D1 and D2 and the wake-up signal, and the resistor R2 is connected between the output end of resistor R1 and the ground, forming a voltage divider structure. Wake-up signal 1 is connected to resistor R1 through diode D2, and wake-up signal 2 is connected to the same node through diode D1. Since wake-up signal 2 is not used and is floating, only wake-up signal 1 works.

[0043] Those of ordinary skill in the art can understand that the above embodiments are specific examples for implementing the present utility model, and in practical applications, various changes can be made in form and details without departing from the spirit and scope of the present utility model.

Claims

1. A control circuit for a skylight brushless motor, characterized in that: It includes a three-phase current acquisition circuit, a power supply voltage acquisition circuit, a temperature acquisition circuit, a Hall encoder acquisition circuit, a MOS transistor switch circuit, and a sleep wake-up circuit; The MOS transistor switch circuit is used to control the closing and opening of six MOS transistors through a chip to control the rotation of the brushless motor; The sleep wake-up circuit is for the entire working circuit and simultaneously establishes a power supply voltage acquisition circuit. The power supply voltage acquisition circuit is used to supply power to each circuit. The temperature acquisition circuit is used to collect the Lin signal during the operation of the motor and feedback it to the ECU. The ECU will stop the operation of the motor when it overheats. The three-phase current acquisition circuit is used to collect current. The Hall encoder acquisition circuit is used to assist the software in collecting the number of Hall elements and further determine the position of the skylight.

2. The control circuit for the skylight brushless motor according to claim 1, wherein: The MOS transistor switch circuit includes a driving chip. The driving chip includes a VB pin, a VS pin, a HO pin, and a LO pin. The VB pin is the gate driving voltage of the high-side MOSFET. The VS pin is the source voltage of the high-side MOSFET. The HO pin is the high-side gate driving output, which drives the MOS transistor Q1 through the resistor R14. The LO pin is the low-side gate driving output, which drives the low-side MOS transistor Q2 through the resistor R15. The MOS transistor Q1 is the upper-bridge MOSFET, and its switching is controlled by the high-side driving signal HO of the driving chip. The source of the upper bridge is connected to the load side of the motor. The MOS transistor Q2 is the lower-bridge MOSFET, and the conduction and cutoff of the lower bridge are controlled by LO, and the source is grounded. The resistors R14 and R15 are gate driving resistors, which limit the charging and discharging current of the MOSFET gate. It also includes anti-reverse diodes D2 and D6 for protecting the MOS transistors Q1 and Q2.

3. The control circuit for the skylight brushless motor according to claim 2, characterized in that: The MOS transistor switch circuit also includes two optocouplers. The two optocouplers are respectively used for isolating the signals of the upper bridge and the lower bridge. The input ends of the two optocouplers receive PWM signals and are respectively connected to two current-limiting resistors R1 and R5. The output ends of the optocouplers are connected to the input ends of the driving chip to respectively control the switching of the high side and the low side.

4. The control circuit for the skylight brushless motor according to claim 3, wherein: After the Hall encoder acquisition circuit is connected to the three-phase windings of the motor, it is respectively connected to pull-up resistors R104, R105, and R107 and then outputs three Hall sensor signals HALLW, HALLV, and HALLU, representing different state signals of the skylight position. It also includes resistors R108, R109, and R110. The resistors R108, R109, and R110 are used to connect the ENCZ, ENCB, and ENCA signals of the encoder to the input port of the encoder to protect the encoder chip through voltage division and current limiting and ensure the stability of the input signal. It also includes Schottky diodes D19, D20, and D21. The Schottky diodes D19, D20, and D21 are respectively connected to the output signals HALLW, HALLV, and HALLU of the Hall sensor, and the cathodes of the Schottky diodes D19, D20, and D21 are respectively connected to R104, R105, and R107.

5. The control circuit for the skylight brushless motor according to claim 4, characterized in that: The three-phase current acquisition circuit is powered by the power supply POWER to provide the main voltage, driving the motor and the circuit to work. The MOS transistors Q1 and Q2 control their conduction and cut-off to achieve the current regulation of the motor. It includes current detection resistors R17 and R18. The resistors R17 and R18 collect current signals and generate a voltage signal DIVU proportional to the current. The three-phase current acquisition circuit also includes an amplification circuit, and the amplification circuit includes a comparator. The comparator is used to amplify the collected current signal. The input end of the comparator is connected to the collected voltage signal DIVU, and the gain is adjusted through resistors R13 and R14. The resistor R11 is used as a reference voltage to set the reference level of the comparator, ensuring that the circuit can correctly amplify the collected signal.

6. The control circuit for the skylight brushless motor according to claim 1, wherein: The power supply voltage acquisition circuit is powered by the power supply POWER and VCC3.

3. It also includes a voltage divider composed of resistors R112, R113, and R115. The voltage divider reduces the voltage POWER to a smaller voltage for measurement. It also includes an operational amplifier U17A. The positive input end of the operational amplifier U17A is connected to the output of the voltage divider, the negative input end of the operational amplifier U17A is directly connected to the output end, and the power supply pin of the operational amplifier U17A is connected to VCC3.

3.

7. The control circuit for the skylight brushless motor according to claim 1, characterized in that: The temperature acquisition circuit is powered by VCC3.

3. It includes an NTC thermistor, a resistor R122, a capacitor C89, an operational amplifier U17B, a diode VD11, and a PESD. The NTC thermistor and the resistor R122 together form a voltage division network for measuring temperature changes. One end of the NTC thermistor is connected to VCC3.3, and the other end is connected to the input of the resistor R122 and the operational amplifier U17B. The other end of the resistor R122 is grounded. One end of the capacitor C89 is connected to the common node of the NTC thermistor and R122, and the other end is grounded. The positive input end of the operational amplifier U17B is connected to the common node of the NTC thermistor and R122. The negative input end of the operational amplifier U17B is connected to its output end to form a voltage follower. The output end VTEMP is used as the output of the temperature acquisition signal. The power supply pin of the operational amplifier U17B is connected to VCC3.3, and the ground pin is grounded. One end of the diode VD11 and the PESD is connected to the output end VTEMP of the operational amplifier U17B, and the other end is grounded.

8. The control circuit for the skylight brushless motor according to claim 1, wherein: The sleep wake-up circuit includes diodes D1 and D2 connected to the input ends of wake-up signal 1 and wake-up signal 2. Wake-up signal 1 is connected to the resistor R1 through the diode D2, and wake-up signal 2 is connected to the same node through the diode D1. It also includes a capacitor C1. One end of the capacitor C1 is connected to the ground, and the other end is connected to the connection point of the input end of wake-up signal 2 and D1. It also includes resistors R1 and R2. The resistor R1 is connected between the common node after the diodes D1 and D2 and the wake-up signal, and the resistor R2 is connected between the output end of the resistor R1 and the ground, forming a voltage divider structure.

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