Direct current motor control SIP chip and optical equipment

Abstract

The invention discloses a direct current motor control SIP chip and optical equipment, the SIP chip comprises a control circuit unit, a motor driving circuit unit, a position feedback circuit unit and a state feedback circuit unit, and the control circuit unit is connected with the motor driving circuit unit, the position feedback circuit unit and the state feedback circuit unit; all the circuit units are packaged into a chip through a system level, and direct current motor driving, position feedback and state monitoring are achieved. According to the invention, only one circuit chip is used for realizing the functions of driving, position monitoring and state monitoring of the multi-path direct current motor, accurate and rapid control of the direct current motor can be realized under reasonable programming setting, and motion control in infrared, visible light, ultraviolet and other optical systems is greatly simplified; and the circuit units are packaged together in a system-in-package (SIP) mode, so that the size and the power consumption of the circuit are greatly reduced, and the reliability and the stability of the control circuit are improved.

Description

Technical Field

[0001] The invention relates to the technical field of direct current motor control and driving, and in particular to a direct current motor control SIP chip and optical equipment. Background Art

[0002] In order to adapt to targets with different focal lengths and depths of field, infrared, visible light, ultraviolet and other optical devices need to adjust the focal length according to the scene requirements to ensure that the optical system is in the required imaging position. The DC motor, as the motion driving component of the focus / zoom mechanism, can drive the mechanical structure to the required position. Since the optical system has high requirements for position accuracy, the motion control of the DC motor is a technical difficulty for optical devices such as infrared, visible light, and ultraviolet. The traditional control method builds a control circuit on the PCB circuit board to control the motion mechanism. In order to achieve high-precision control, a large number of peripheral devices are required to realize the drive of the DC motor, position / speed monitoring, and motor status monitoring. At the same time, there are many debugging parameters, large size, high power consumption, and poor integration, which is not conducive to application in optical systems with high integration. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the present invention provides a DC motor control SIP chip and an optical device. The SIP chip has a built-in control circuit unit, a position feedback circuit unit and a motor drive circuit unit. Each circuit unit is integrated into a chip through a system-level package (SIP). Through programming, the DC motor can be accurately and quickly controlled, which greatly reduces the design difficulty of the motion control circuit in the optical system, greatly reduces the volume and power consumption of the control circuit, and improves the stability and reliability of the control circuit.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A DC motor control SIP chip, the SIP chip comprises a control circuit unit, a motor drive circuit unit, a position feedback circuit unit and a state feedback circuit unit, the control circuit unit is connected with the motor drive circuit unit, the position feedback circuit unit and the state feedback circuit unit; each circuit unit is packaged into a chip through a system-level package;

[0006] Among them, the position feedback circuit unit feeds back the position information, and the control circuit unit periodically provides the motor drive circuit unit with a forward or reverse drive logic signal according to the fed-back position information, thereby controlling various actions of the DC motor;

[0007] The state feedback circuit unit feeds back the state information of the DC motor, and the control circuit unit determines whether to change the driving logic signal according to the fed-back state information of the DC motor, thereby achieving the purpose of protecting the DC motor;

[0008] The motor drive circuit unit is connected to the DC motor and provides the DC motor with the voltage required for rotation under the driving logic signal of the control circuit unit.

[0009] In the above scheme, the motor drive circuit unit includes a logic circuit, a clock circuit, an overcurrent protection circuit, an undervoltage protection circuit, an overtemperature protection circuit, a gate driver and a drive bridge;

[0010] The logic circuit is connected to the clock circuit, the overcurrent protection circuit, the undervoltage protection circuit, the overtemperature protection circuit, and the gate driver, and the gate driver is connected to the DC motor through the drive bridge; the clock circuit provides a clock signal, and the overcurrent protection circuit, the undervoltage protection circuit, and the overtemperature protection circuit feed back the current, voltage, and temperature information in the motor drive circuit unit to the logic circuit. When the motor drive circuit unit has an overcurrent, undervoltage, or overtemperature condition, the logic circuit immediately shuts off the drive, thereby protecting the motor drive circuit unit.

[0011] In the above scheme, the logic circuit is provided with a control logic interface, through which the logic circuit is connected to the control circuit unit, receives control information from the control circuit unit and converts it into a driving signal of the gate driver after processing. The gate driver drives the power transistor under the drive signal to provide the DC motor with the voltage required for rotation.

[0012] In the above scheme, the control circuit unit is a programmable circuit unit, and the chip is functionally configured by external programming through a reserved programming interface.

[0013] In the above solution, the position feedback circuit unit feeds back position information specifically as follows:

[0014] The position feedback circuit unit feeds back voltage information of the potentiometer in the optical system and orthogonal pulse change information of the DC motor encoder, and the control circuit unit determines the position of the optical system according to the change in voltage or the change in the number of orthogonal pulses.

[0015] In the above scheme, the position feedback circuit unit includes a plurality of followers and an orthogonal signal processing circuit, and simultaneously receives a plurality of voltage signals and a plurality of orthogonal encoder signals.

[0016] In the above scheme, the various actions of the DC motor include movement, stop and deceleration.

[0017] In the above scheme, the state feedback circuit unit feeds back the DC motor state information, and the control circuit unit determines whether to change the drive logic signal according to the fed-back DC motor state information, specifically:

[0018] The state feedback circuit unit includes a temperature monitoring circuit, a current monitoring circuit and a voltage monitoring circuit. When the motor moves, it monitors the temperature, current and voltage information of the motor in real time and feeds back to the control circuit unit. When the temperature, current or voltage exceeds the preset range, the control circuit unit changes the drive logic signal to slow down or stop the motor, thereby protecting the DC motor.

[0019] In the above solution, the SIP chip also includes a power circuit unit; the power circuit unit is connected to the control circuit unit, the motor drive circuit unit, the position feedback circuit unit, and the state feedback circuit unit to provide power supply to each circuit unit inside the SIP chip.

[0020] An optical device, comprising the DC motor controlled SIP chip and the focus and zoom mechanism as described in any one of the above;

[0021] The focus adjustment and zoom mechanism comprises a DC motor, and the focus adjustment and zoom are realized by controlling the DC motor through the SIP chip.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] The present invention uses a circuit chip to realize the driving, position monitoring and status monitoring functions of multiple DC motors. Under reasonable programming settings, it can realize accurate and rapid control of DC motors, greatly simplifying the motion control in optical systems such as infrared, visible light and ultraviolet light; and uses the system-level package (SIP) form to package each circuit unit together, greatly reducing the size and power consumption of the circuit, and improving the reliability and stability of the control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a principle block diagram of the DC motor control SIP chip of the present invention;

[0025] Figure 2 is a circuit schematic diagram of a driving circuit unit of the present invention;

[0026] Figure 3 It is a circuit principle diagram of the position feedback circuit unit of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific implementation methods described herein are used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various implementation methods of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] The present invention provides a DC motor control SIP chip, which can realize the drive and control of the DC motor, including: a control circuit unit 11, a drive circuit unit 12, a position feedback circuit unit 13, a state feedback circuit unit 14, and a power circuit unit 15, each circuit unit is a chip through a system-level package (SIP). The chip can realize the drive of the motor, the DC motor position / speed monitoring, the motor and the chip state monitoring, the DC motor overcurrent protection, over-temperature protection, and stall protection, and realize the precise and rapid control of the DC motor.

[0029] like Figure 1 As shown, the DC motor SIP control chip of the present invention includes: a control circuit unit 11, a drive circuit unit 12, a position feedback circuit unit 13, a state feedback circuit unit 14, and a power supply circuit unit 15. Each circuit unit is integrated into a chip through a system-level package (SIP) to realize DC motor drive, position feedback and state monitoring.

[0030] The control circuit unit 11 is the control core of the entire chip, connected to the drive circuit unit 12, the position feedback circuit unit 13, and the state feedback circuit unit 14, processes the feedback information of each circuit, and controls the working state of each circuit. The control circuit unit 11 is a programmable circuit unit, and through the reserved programming interface, the chip can be configured by external programming.

[0031] The driving circuit unit 12 mainly drives the motor. It is a circuit unit that drives the DC motor to move. It is mainly composed of a logic circuit, a clock circuit, an overcurrent protection circuit, an undervoltage protection circuit, an overtemperature protection circuit, a gate driver, and a driving bridge, and provides drive for the DC motor. The driving circuit unit 12 includes a control logic interface, which is connected to the control circuit unit 11 and is controlled by the unit.

[0032] The position feedback circuit unit 13 is a processing circuit for the position feedback device when the motor moves, and can receive information from an external position feedback device, condition the position feedback device position signal, and transmit it to the control circuit unit 11 of the chip.

[0033] The state feedback circuit unit 14 reserves a state monitoring interface to monitor the temperature, current, voltage and other information of the motor in real time during movement, and promptly feeds back to the control circuit unit 11. The state feedback circuit unit 14 can monitor the state of the motor and the chip itself, and transmit the information to the control circuit unit 11 through the internal interface.

[0034] The power circuit unit 15 provides driving voltage for each circuit unit of the entire chip to ensure that each circuit unit works normally. Since each module has different requirements for driving voltage and current, this part of the circuit converts the external voltage into the voltage required by each circuit module.

[0035] Finally, through programming, the driving circuit unit 12, the position feedback circuit unit 13, the state feedback circuit unit 14, and the power supply circuit unit 15 cooperate to achieve precise and rapid control of the DC motor.

[0036] Specifically, the DC motor control SIP chip of this embodiment is as follows: Figure 1 As shown, it includes: a control circuit unit 11, a drive circuit unit 12, a position feedback circuit unit 13, a state feedback circuit unit 14, and a power supply circuit unit 15. Each circuit unit is a chip through a system-level package (SIP). The control circuit unit 11 is the control center of the entire chip, connected to the drive circuit unit 12, the position feedback circuit unit 13, and the state feedback circuit unit 14, processes the feedback information of each part of the circuit, and controls the working state of each part of the circuit. The position feedback circuit 13 feeds back the voltage information of the potentiometer in the optical system and the orthogonal pulse change information of the DC motor encoder. The control circuit unit 11 determines the position of the optical system according to the change in voltage or the change in the number of orthogonal pulses, and periodically provides the drive circuit unit 12 with a forward / reverse drive logic signal according to the program setting of the control circuit unit 11, thereby achieving the control of the DC motor movement, stop, deceleration and other actions.

[0037] Reference Figure 2 In the DC motor control SIP chip, the driving circuit unit 12 is a circuit unit that drives the DC motor to move, and is mainly composed of a logic circuit, a clock circuit, an overcurrent protection circuit, an undervoltage protection circuit, an overtemperature protection circuit, a gate driver, and a driving bridge. The logic circuit receives the control information of the chip control circuit unit 11 and converts it into a driving signal of the gate driver after processing. The gate driver drives the power transistor under the drive of the driving signal to provide the DC motor with the voltage required for rotation. In this embodiment, this unit contains four groups of power transistors and can drive four DC motors at the same time. The undervoltage protection circuit, overtemperature protection circuit, and overcurrent protection circuit feed back the voltage, temperature, and current information in the unit to the logic circuit unit. When the circuit is running, if there is overtemperature, undervoltage, overcurrent, etc., the drive is immediately shut down to achieve the function of protecting the circuit unit.

[0038] Reference Figure 3 In the DC motor control SIP chip, the position feedback circuit unit 13 receives the position feedback information of the optical system motion device, conditions the position feedback information and transmits it to the control circuit unit 11, and provides closed-loop control information for the control circuit unit 11. The module circuit is composed of four followers and four orthogonal signal processing circuits, and can simultaneously receive four voltage signals and four orthogonal encoder signals.

[0039] In the DC motor control SIP chip, the state feedback circuit unit 14 reserves a state monitoring interface, which is composed of a temperature monitoring circuit, a current monitoring circuit, and a voltage monitoring circuit. When the motor moves, the temperature, current, voltage and other information of the motor movement are monitored in real time, and the information is fed back to the control circuit unit 11 in time. When the temperature, current, voltage and other information exceed the preset range, the control circuit unit 11 changes the driving logic signal to slow down or stop the motor, thereby protecting the DC motor.

[0040] In the DC motor control SIP chip, the power circuit unit 15 provides driving voltage for each module of the entire chip. This part of the circuit converts the external voltage into the voltage required by each circuit module.

[0041] The present invention also provides an optical device, which includes the DC motor controlled SIP chip and a focus and zoom mechanism as described in any one of the above; the focus and zoom mechanism includes a DC motor, and the SIP chip controls the DC motor to achieve focus and zoom.

[0042] In summary, the present invention uses only one circuit chip to realize the driving, position monitoring, and state monitoring functions of multiple DC motors. Under reasonable programming settings, it can realize accurate and rapid control of DC motors, greatly simplifying the motion control in optical systems such as infrared, visible light, and ultraviolet light; and uses the system-level package (SIP) form to package each circuit unit together, greatly reducing the size and power consumption of the circuit, and improving the reliability and stability of the control circuit.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A DC motor control SIP chip, characterized in that: The SIP chip includes a control circuit unit, a motor drive circuit unit, a position feedback circuit unit and a state feedback circuit unit, wherein the control circuit unit is connected to the motor drive circuit unit, the position feedback circuit unit and the state feedback circuit unit; each circuit unit is packaged into a chip through a system-level package; Among them, the position feedback circuit unit feeds back the position information, and the control circuit unit periodically provides the motor drive circuit unit with a forward or reverse drive logic signal according to the fed-back position information, thereby controlling various actions of the DC motor; The state feedback circuit unit feeds back the state information of the DC motor, and the control circuit unit determines whether to change the driving logic signal according to the fed-back state information of the DC motor, thereby achieving the purpose of protecting the DC motor; The motor drive circuit unit is connected to the DC motor and provides the DC motor with the voltage required for rotation under the driving logic signal of the control circuit unit.

2. The DC motor control SIP chip according to claim 1, characterized in that: The motor drive circuit unit includes a logic circuit, a clock circuit, an overcurrent protection circuit, an undervoltage protection circuit, an overtemperature protection circuit, a gate driver and a drive bridge; The logic circuit is connected to the clock circuit, the overcurrent protection circuit, the undervoltage protection circuit, the overtemperature protection circuit, and the gate driver, and the gate driver is connected to the DC motor through the drive bridge; the clock circuit provides a clock signal, and the overcurrent protection circuit, the undervoltage protection circuit, and the overtemperature protection circuit feed back the current, voltage, and temperature information in the motor drive circuit unit to the logic circuit. When the motor drive circuit unit has an overcurrent, undervoltage, or overtemperature condition, the logic circuit immediately shuts off the drive, thereby protecting the motor drive circuit unit.

3. The DC motor control SIP chip according to claim 2, characterized in that: The logic circuit is provided with a control logic interface, through which the logic circuit is connected to the control circuit unit, receives control information from the control circuit unit and converts it into a driving signal of the gate driver after processing. The gate driver drives the power transistor under the drive signal to provide the DC motor with the voltage required for rotation.

4. The DC motor control SIP chip according to claim 1, characterized in that: The control circuit unit is a programmable circuit unit, which can configure the chip functions through external programming via a reserved programming interface.

5. The DC motor control SIP chip according to claim 1, characterized in that: The position feedback circuit unit feedback position information is specifically: The position feedback circuit unit feeds back voltage information of the potentiometer in the optical system and orthogonal pulse change information of the DC motor encoder, and the control circuit unit determines the position of the optical system according to the change in voltage or the change in the number of orthogonal pulses.

6. The DC motor control SIP chip according to claim 5, characterized in that: The position feedback circuit unit includes a plurality of followers and an orthogonal signal processing circuit, and simultaneously receives a plurality of voltage signals and a plurality of orthogonal encoder signals.

7. The DC motor control SIP chip according to claim 1, characterized in that: The various actions of a DC motor include moving, stopping, and decelerating.

8. The DC motor control SIP chip according to claim 1, characterized in that: The state feedback circuit unit feeds back the state information of the DC motor, and the control circuit unit determines whether to change the drive logic signal according to the fed-back state information of the DC motor, specifically: The state feedback circuit unit includes a temperature monitoring circuit, a current monitoring circuit and a voltage monitoring circuit. When the motor moves, it monitors the temperature, current and voltage information of the motor in real time and feeds back to the control circuit unit. When the temperature, current or voltage exceeds the preset range, the control circuit unit changes the drive logic signal to slow down or stop the motor, thereby protecting the DC motor.

9. The DC motor control SIP chip according to claim 1, characterized in that: The SIP chip also includes a power circuit unit; the power circuit unit is connected to the control circuit unit, the motor drive circuit unit, the position feedback circuit unit, and the state feedback circuit unit to provide power supply to each circuit unit inside the SIP chip.

10. An optical device, characterized in that: The optical device comprises the DC motor control SIP chip and the focus and zoom mechanism as claimed in any one of claims 1 to 9; The focus adjustment and zoom mechanism comprises a DC motor, and the focus adjustment and zoom are realized by controlling the DC motor through the SIP chip.

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