Opening and closing body control device

Abstract

To provide an opening / closing body controller capable of preventing a control substrate from being damaged, even when an overvoltage is generated in a state where no power supply is applied.SOLUTION: An opening / closing body controller comprises: a break circuit for breaking a motor that drives an opening / closing body; a control circuit for controlling the break circuit so as to break the motor, when a signal is input to a predetermined input terminal; and a switch circuit for inputting the signal to the predetermined input terminal, and that is made to be conductive based on a voltage, when the voltage whose value is a predetermined value or more is generated via power-generation of the motor.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an opening / closing member control device. [Background technology]

[0002] 2. Description of the Related Art Opening and closing body control devices are known that use the power of a motor to open and close an opening and closing body such as a lift gate provided in a vehicle.

[0003] Some of these types of opening / closing member control devices are designed to allow the opening / closing member to be opened or closed manually by the user. If the opening / closing member is suddenly opened or closed manually by the user, an overvoltage may occur in the motor. In this case, the overvoltage may damage the control board that controls the power supply from the power supply to the motor.

[0004] For example, Patent Document 1 discloses an opening / closing member control device that is provided with a sensor that detects overvoltage and a relay switch, and is configured so that power is supplied from a power supply device to a drive source via the relay switch. Patent Document 1 discloses that when an overcurrent is detected by the sensor, the relay switch becomes conductive and power is supplied from the power supply device to the drive source, thereby suppressing the overvoltage. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2018 / 066550 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the opening and closing body control device described in Patent Document 1 above, if an overvoltage occurs when power is not supplied from the power supply device to the drive source, the overvoltage cannot be suppressed, which presents a problem in that the control board may be damaged.

[0007] An object of the present invention is to provide an opening / closing member control device that can prevent damage to a control board even if an overvoltage occurs when the power is not turned on. [Means for solving the problem]

[0008] In order to achieve the above object, the opening / closing member control device of the present invention comprises: a braking circuit for braking a motor that drives the opening / closing body; Prescribed input terminal and the input terminal a control circuit that controls the braking circuit so that the motor is braked when a signal is input to the control circuit; The input terminal is arranged to be able to connect / disconnect a path of current flowing between the motor side and the input terminal, The motor generates electricity and the When an overvoltage is applied to the path, The signal is input to the predetermined input terminal. but input Connect the paths so that A switch circuit; Equipped with. [Effects of the Invention]

[0009] According to the opening / closing member control device of the present invention, even if an overvoltage occurs when the power is not turned on, damage to the control board can be prevented. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of an opening / closing member control device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of the configuration of an opening / closing member control device 1 according to an embodiment of the present invention. The opening / closing member control device 1 is a device that controls the opening and closing of an opening / closing member, such as a back door, provided on a vehicle, using the power of a motor 40. The opening / closing member may be any type as long as it can transition between an open state and a closed state, and may be, for example, a sliding door. The opening / closing member control device 1 is also configured to open and close the opening / closing member by manual operation by a user.

[0012] The opening / closing member control device 1 includes a control system power supply circuit 10, a motor drive circuit 20, a motor driver 30 (corresponding to the "control circuit" of the present invention), and a switch circuit 50. The drive system power supply circuit 60 supplies power from a battery to the motor drive circuit 20. In this embodiment, the drive system power supply circuit 60 is drawn with a dashed line to indicate a state in which power is not being supplied from the drive system power supply to the motor drive circuit 30.

[0013] [Control system power supply circuit 10] The control system power supply circuit 10 includes a control system power supply 11 and a control system power supply line 12. The control system power supply line 12 branches into a motor drive circuit side path 12a and a switch circuit side path 12b at a branch point. The motor drive circuit side path 12a is a power supply line that supplies power from the control system power supply 11 to the motor drive circuit 20.

[0014] [Motor drive circuit 20] The motor drive circuit 20 is a circuit that drives the motor 40 by adjusting the power from the battery and supplying it to the power supply lines of each phase of the motor 40. The motor drive circuit 20 is equipped with a braking circuit 22 that brakes the motor 40. In this embodiment, the braking circuit 22 is a circuit that controls a brake that is detachable from the rotating shaft of the motor 40. The brake has an electromagnetic clutch and a load that is connected to the rotating shaft of the motor 40 via the electromagnetic clutch. The electromagnetic clutch connects or disconnects the rotating shaft of the motor 40 from the load.

[0015] The load is configured as a rotating disk or a rotary damper that has a moment of inertia sufficiently larger than that of the rotor provided in motor 40, in order to attenuate the rotational force of the rotor. Note that the load in the present invention is not limited to a rotating disk or a rotary damper, and may be anything that can attenuate the rotational force of the rotor.

[0016] [Motor Driver 30] Motor driver 30 is a control board that estimates the position and rotation speed of the rotor of motor 40 using various parameters that indicate the characteristics of motor 40, such as the winding resistance, inductance component, and number of poles of motor 40, and performs PI control on the rotation speed or motor current. Motor driver 30 transmits an operation signal corresponding to the operation of an operation switch provided on an instrument panel or the like as a control signal to motor drive circuit 20 via a signal line (not shown).

[0017] Motor driver 30 has input terminal 31 for receiving a voltage from switch circuit 50. When a voltage within a specified voltage range is input to input terminal 31, motor driver 30 outputs a drive signal to motor drive circuit 20 to connect the rotating shaft of motor 40 to the load, thereby controlling the electromagnetic clutch provided in motor drive circuit 20. On the other hand, when a voltage outside the specified voltage range is input to input terminal 31, motor driver 30 outputs a drive signal to motor drive circuit 20 to release the connection between the rotating shaft of motor 40 and the load, thereby controlling the electromagnetic clutch.

[0018] [Motor 40] In this embodiment, motor 40 uses its power to open and close an opening / closing body such as a liftgate provided on a vehicle. Motor 40 is, for example, a three-phase brushless DC motor and includes a rotor and a stator. The rotor includes multiple permanent magnets with north and south poles and rotates around a rotation axis relative to the stator. The stator includes three-phase drive coils. As the rotor rotates, the three-phase drive coils generate an induced voltage corresponding to the rotation speed of the rotor.

[0019] When the opening / closing member is suddenly opened or closed by manual operation by the user, an overvoltage may occur in the motor 40. In this case, the overvoltage may be applied to a signal line (not shown), which may damage electronic components provided in the motor driver 30 (control board). Therefore, the opening / closing member control device 1 in this embodiment is provided with a switch circuit 50.

[0020] [Switch circuit 50] A switch circuit side path 12b is connected to a terminal 51 provided on the switch circuit 50. A terminal 52 provided on the switch circuit 50 is connected to an input terminal 31 provided on the motor driver 30 via a motor driver side path 13. Note that an overvoltage generated in the motor 40 is applied to the terminal 51 via the motor drive circuit side path 12a and the switch circuit side path 12b.

[0021] The switch circuit 50 switches the magnitude of the voltage input to the input terminal 31 provided in the motor driver 30 in accordance with the magnitude of the overvoltage applied to the terminal 51 .

[0022] The switch circuit 50 includes Zener diodes ZD1 and ZD2, resistors R1, R2, R3, R4, R5, and R6, diodes D1, D2, D3, and D4, a transistor Q1, and a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) Q2.

[0023] [Zener diode ZD1, diodes D1 and D2] The cathode of Zener diode ZD1 is connected to terminal 51 provided in switch circuit 50, and the anode of Zener diode ZD1 is connected to the anode of diode D1. Zener diode ZD1 is a voltage limiting element that conducts at a predetermined Zener voltage VZ1 or higher. As a result, when the voltage input to terminal 51 is the predetermined Zener voltage VZ1 or higher, the Zener voltage VZ1 is applied to the anode of diode D1. The anode of diode D2 is connected to a 12V power supply. The 12V power supply voltage is applied to the anode of diode D2.

[0024] [Transistor Q1, resistors R1, R2, R3] The contact point CP1 where the cathodes of diodes D1 and D2 are connected together is connected to the base of transistor Q1 via resistor R1. Resistor R2 is connected between the collector and base of transistor Q1. Resistor R3 is connected to the collector. The emitter of transistor Q1 is grounded.

[0025] When the voltage input to terminal 51 of switch circuit 50 is equal to or greater than a predetermined Zener voltage VZ1, a base current flows, turning transistor Q1 on (conducting), and allowing a collector current to flow. When the voltage input to terminal 51 is less than the predetermined Zener voltage VZ1, no base current flows, turning transistor Q1 off (non-conducting), and no collector current flows. The resistance values of resistors R1 and R2 are set based on factors such as the current amplification factor, which is the ratio between the base current and the collector current. Resistor R3 is set based on the collector current.

[0026] [MOSFETQ2] The gate terminal of MOSFET Q2 is connected to the anode of Zener diode ZD1 via resistor R3, transistor Q1, and diode R3. The source terminal of MOSFET Q2 is connected to the cathode (terminal 51) of Zener diode ZD1. The drain terminal of MOSFET Q2 is connected to terminal 52. In this embodiment, MOSFET Q2 is a P-channel MOSFET. It turns on (conductive) when the gate is lower in potential than the source and the potential difference between the source and gate is equal to or greater than a threshold. This causes current to flow from terminal 52 of switch circuit 50 to motor driver path 13, and voltage is applied to input terminal 31 of motor driver 30. On the other hand, MOSFET Q2 turns off (non-conductive) when the potential difference between the source and gate is less than the threshold or when the potential of the gate is equal to or higher than the source. This prevents current from flowing from terminal 52 to motor driver path 13, and therefore no voltage is applied to input terminal 31.

[0027] [Resistance R4] A resistor R4 is provided between the source terminal and the gate terminal. The resistance value of the resistor R4 is set so that when a potential difference occurs across the resistor R4 due to a current applied to a terminal 51 provided in the switch circuit 50, the potential difference between the source and gate is equal to or greater than a threshold value.

[0028] MOSFET Q2 is subject to limitations in its use. For example, the potential difference between its source and gate is limited to a specific range. The potential difference between its source and gate increases in accordance with the magnitude of the current applied to terminal 51 of switch circuit 50. If the potential difference between its source and gate exceeds the maximum allowable voltage that can be applied, MOSFET Q2 may be damaged.

[0029] [Zener diode ZD2] Between the source and gate terminals, Zener diode ZD2, which is a diode to protect MOSFET Q2, is connected in parallel with resistor R4. Zener diode ZD2 shorts the source and gate by conducting current before the potential difference between the source and gate exceeds the maximum allowable voltage mentioned above. Shorting the source and gate turns MOSFET Q2 off, preventing damage to MOSFET Q2.

[0030] [Diodes D3 and D4] Diodes D3 and D4 are provided between the source and gate of MOSFET Q2 to prevent electrostatic breakdown. The anodes of diodes D3 and D4 are connected together, the cathode of diode D3 is connected to the source terminal, and the cathode of diode D4 is connected to the gate terminal.

[0031] [Operation of opening / closing body control device 1] Next, the operation of the opening / closing member control device 1 will be described. In the following description, the opening / closing member control device 1 is in a state where the power is not turned on. Specifically, as shown by the dashed line of the drive system power supply circuit 60, power is not being supplied from the drive system power supply to the motor drive circuit 20, and the control system power supply circuit 10 is not supplying power from the control system power supply 11 to either the motor drive circuit 20 or the motor driver 30.

[0032] When the user manually opens or closes the opening / closing body suddenly, the motor 40 may generate electricity, which may cause an overvoltage. This causes an overcurrent to flow from the motor drive circuit 20 through the motor drive circuit-side path 12a and the switch circuit-side path 12b, and an overvoltage is applied to the terminal 51 provided on the switch circuit 50.

[0033] When the overvoltage applied to terminal 51 of switch circuit 50 is equal to or greater than Zener voltage VZ1, Zener diode ZD1 conducts, causing a base current to flow in transistor Q1, turning transistor Q1 on (conducting), and causing a collector current to flow. As a result, the potential difference between the source and gate of MOSFET Q2 becomes equal to or greater than the threshold, turning MOSFET Q2 on (conducting).

[0034] When MOSFET Q is turned on, current flows from terminal 52 of switch circuit 50 to motor driver-side path 13, and voltage is applied to input terminal 31 of motor driver 30. When voltage is applied to input terminal 31, motor driver 30 outputs a drive signal to motor drive circuit 20, which controls the electromagnetic clutch of motor drive circuit 20 to connect the rotating shaft of motor 40 to the load. This brakes motor 40, preventing overvoltage caused by manual operation by the user. As a result, it becomes possible to prevent damage to motor driver 30.

[0035] On the other hand, when the overvoltage applied to the terminal 51 of the switch circuit 50 is less than the Zener voltage VZ1, the Zener diode ZD1 does not conduct electricity, and the transistor Q1 is turned off, thereby turning off the MOSFET Q2.

[0036] With MOSFET Q2 turned off, no current flows from terminal 52 on switch circuit 50 to motor driver-side path 13. As a result, no voltage is applied to input terminal 31 on motor driver 30, so no drive signal is output from motor driver 30 to motor drive circuit 20, and the electromagnetic clutch on motor drive circuit 20 releases the connection between the rotating shaft of motor 40 and the load. However, because the overvoltage is low, there is no risk of damage to motor driver 30.

[0037] As described above, even when the power is not turned on, the input terminal 31 of the motor driver 30 can be switched between a state in which a voltage is applied and a state in which no voltage is applied depending on the magnitude of the voltage applied to the terminal 51 of the switch circuit 50, thereby making it possible to prevent damage to the motor driver 30.

[0038] The opening / closing body control device 1 according to an embodiment of the present invention comprises a brake that brakes the motor that drives the opening / closing body, a motor driver 30 that controls the brake so that the motor 40 is braked when a voltage is applied to a specified input terminal 31, and a switch circuit 50 that, when the motor 40 generates electricity and an overvoltage greater than a specified value occurs, becomes conductive based on the generated overvoltage and applies voltage to the specified input terminal 31.

[0039] According to the above configuration, even when the power is not supplied, if the motor 40 generates electricity and an overvoltage equal to or greater than a predetermined value occurs, a voltage is applied to a predetermined input terminal 31 provided in the motor driver 30, and the brake is controlled to brake the motor 40, thereby preventing damage to the motor driver 30. Furthermore, since the switch circuit 50 is provided, even when the power to the motor driver 30 is turned off, an overvoltage of the motor 40 can be detected, thereby reducing power consumption. Note that, even when the power is supplied, the above configuration applies a voltage to a predetermined input terminal 31 provided in the motor driver 30, and the brake is controlled to brake the motor 40, just as when the power is not supplied, if the motor 40 generates electricity and an overvoltage equal to or greater than a predetermined value occurs, even when the power is supplied.

[0040] Furthermore, the switch circuit 50 in this embodiment has a voltage limiting element, such as a Zener diode, that becomes conductive when a voltage equal to or greater than a predetermined value is generated. The voltage limiting element provided in the switch circuit 50 makes it possible to reliably turn on the switch circuit 50 when a voltage equal to or greater than a predetermined value is applied to the terminal 51 provided in the switch circuit 50.

[0041] Furthermore, switch circuit 50 in this embodiment has MOSFET Q2, which is disposed between motor 40 and a predetermined input terminal 31 and, when a voltage is generated, provides conduction between motor 40 and input terminal 31. MOSFET Q2, disposed between motor 40 and predetermined input terminal 31, ensures conduction between motor 40 and input terminal 31 via MOSFET Q2 when an overvoltage is applied to terminal 51 of the switch circuit, and can reliably cut off conduction between motor 40 and input terminal 31 when an allowable voltage that cannot be considered an overvoltage is applied to terminal 51.

[0042] The voltage limiting element of switch circuit 50 is Zener diode ZD1, which breaks down and becomes conductive when a voltage equal to or greater than a predetermined value is generated, and MOSFET Q2 is a P-channel MOSFET, with the anode of Zener diode ZD1 located on the gate terminal side of the P-channel MOSFET, the cathode of Zener diode ZD1 located on the source terminal side of the P-channel MOSFET, and a predetermined input terminal 31 located on the drain terminal side of the P-channel MOSFET. Since the anode of Zener diode ZD1 is located on the gate terminal side of the MOSFET and the anode of Zener diode ZD1 is located on the source terminal side of the P-channel MOSFET, it is possible to reliably turn on MOSFET Q2 when the voltage applied to terminal 51 is equal to or greater than the Zener voltage, and to reliably turn off MOSFET Q2 when the voltage applied to terminal 51 is less than the Zener voltage.

[0043] The resistors R3 and R4 and the Zener diode ZD2 described in the above embodiment are not necessarily required. For example, by changing the specifications of the MOSFET Q2, it is possible to eliminate the resistors R3 and R4 and the Zener diode ZD2.

[0044] Furthermore, the Zener diode ZD1 and the diodes D1 and D2 described in the above embodiment are not necessarily required. For example, by eliminating the 12V power supply, it is possible to eliminate the Zener diode ZD1 and the diodes D1 and D2.

[0045] In the above embodiment, the two components, the transistor Q1 and the MOSFET Q2, may be replaced with a single component, a transistor array. By replacing the two components with one component, it is possible to reduce the number of components and the mounting area.

[0046] In the above embodiment, a voltage detection circuit or the like may be used instead of the Zener diode ZD1. This allows the switch circuit 50 to be turned on at a specified voltage detected by the voltage detection circuit, thereby improving the accuracy of operating the switch circuit 50.

[0047] Furthermore, the above-described embodiments are merely examples of specific embodiments for carrying out the present invention, and the technical scope of the present invention should not be construed as being limited by these embodiments. In other words, the present invention can be carried out in various forms without departing from the gist or main features thereof. [Industrial Applicability]

[0048] The present invention is effective as an opening / closing body opening / closing device that can prevent damage to the control board even when an overvoltage occurs while the power is not turned on. [Explanation of symbols]

[0049] D1, D2, D3, D4 diodes Q1 transistor Q2 MOSFET R1,R2,R3 resistance ZD1 Zener diode ZD2 Zener diode 1 Opening and closing body control device 10 Control system power circuit 11 Control system power supply 12 Control system power line 12a Motor drive circuit side path 12b Switch circuit side path 13 Motor driver side path 20 Motor drive circuit 22 Braking circuit 30 Motor Driver 31 Input terminal 40 Motor 50 Switch Circuit 51 terminals 52 terminals 60 Drive system power circuit

Claims

1. a braking circuit for braking a motor that drives the opening / closing body; a control circuit having a predetermined input terminal, and controlling the braking circuit so that the motor is braked when a signal is input to the input terminal; a switch circuit that is arranged to be able to connect / disconnect a path of a current flowing between the motor side and the input terminal, and that connects the path so that the signal is input to the predetermined input terminal via the path when the motor generates power and an overvoltage equal to or greater than a predetermined value is applied to the path; Equipped with Opening and closing body control device.

2. The opening / closing member control device according to claim 1 , wherein the switch circuit includes a Zener diode that breaks down and connects the path when an overvoltage equal to or greater than the predetermined value occurs.

3. The opening / closing member control device according to claim 2 , wherein the switch circuit has a MOSFET that is disposed on the path and that connects the path when the overvoltage occurs.

4. The opening / closing body control device described in Claim 3, wherein the MOSFET is a P-channel MOSFET, the anode of the Zener diode is arranged on the gate terminal side of the P-channel MOSFET, the cathode of the Zener diode is arranged on the source terminal side of the P-channel MOSFET, and the specified input terminal is arranged on the drain terminal side of the P-channel MOSFET.

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