Opening and closing body control device

Abstract

The present application provides an open-close body control device that can prevent damage to a control substrate even in the case where an overvoltage occurs in a non-powered state. The open-close body control device includes a braking circuit that brakes a motor that drives an open-close body; a control circuit that controls the braking circuit to brake the motor in the case where a signal is input to a predetermined input terminal; and a switching circuit that turns on based on a voltage generated by the motor in the case where the motor generates a voltage of a predetermined value or more, and causes the signal to be input to the predetermined input terminal.

Description

Technical Field

[0001] This invention relates to an opening and closing control device. Background Technology

[0002] There are known opening and closing control devices that use the power of an electric motor to open and close opening and closing mechanisms such as lifting doors installed on vehicles.

[0003] This type of opening / closing control device has a structure that allows the opening and closing of the opening / closing body to be performed manually by the user. When the opening / closing body is opened or closed rapidly by the user's manual operation, overvoltage may sometimes be generated in the motor. In this case, the control board that controls the power supply from the power supply device to the motor may be damaged due to the overvoltage.

[0004] For example, Patent Document 1 discloses an opening / closing control device, which is configured to include a sensor for detecting overvoltage and a relay switch, and to supply power 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 is turned on, supplying power from the power supply device to the drive source, thereby suppressing the overvoltage.

[0005] Prior art literature

[0006] Patent documents

[0007] Patent Document 1: International Publication No. 2018 / 066550 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] Furthermore, the opening / closing control device described in Patent Document 1 has the following problem: when an overvoltage occurs without power being supplied from the power supply device to the drive source, the overvoltage cannot be suppressed, and the control board may be damaged.

[0010] The purpose of this invention is to provide an opening / closing control device that can prevent damage to the control board even when an overvoltage occurs in a non-energized state.

[0011] Methods for solving problems

[0012] To achieve the above objectives, the opening / closing body control device of the present invention includes: a braking circuit for braking a motor that drives the opening / closing body; a control circuit for controlling the braking circuit to brake the motor when a signal is input to a predetermined input terminal; and a switching circuit for turning on based on the voltage when the motor generates electricity and produces a voltage of a predetermined value or higher, so that the signal is input to the predetermined input terminal.

[0013] Invention Effects

[0014] According to the opening and closing control device of the present invention, damage to the control board can be prevented even if an overvoltage occurs when the power is off. Attached Figure Description

[0015] Figure 1 This is a diagram illustrating an example of the structure of an opening / closing control device according to an embodiment of the present invention. Detailed Implementation

[0016] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0017] Figure 1 This diagram illustrates an example of the structure of the opening / closing control device 1 according to an embodiment of the present invention. The opening / closing control device 1 is a device that uses the power of an electric motor 40 to control the opening and closing of opening / closing bodies such as rear doors of vehicles. It should be noted that the opening / closing body can be any type, as long as it can transition between an open and closed state; for example, it can be a sliding door. Furthermore, the opening / closing control device 1 allows the opening and closing of the opening / closing body to be performed manually by the user.

[0018] The opening / closing control device 1 includes a system power supply circuit 10, a motor drive circuit 20, a motor driver 30 (corresponding to the "control circuit" of this invention), and a switching circuit 50. It should be noted that the drive system power supply circuit 60 supplies power from the battery to the motor drive circuit 20. In this embodiment, the drive system power supply circuit 60 is depicted with dashed lines to indicate a state where no power is supplied from the drive system power supply to the motor drive circuit 30.

[0019] [Control System Power Supply Circuit 10]

[0020] 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 at a branch point into a motor drive circuit side path 12a and a switch circuit side path 12b. 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.

[0021] [Motor drive circuit 20]

[0022] The motor drive circuit 20 drives the motor 40 by adjusting the power from the storage battery and supplying it to the power lines of each phase of the motor 40. The motor drive circuit 20 includes a braking circuit 22 for braking the motor 40. In this embodiment, the braking circuit 22 is a circuit that controls a brake that is detachable from the rotation shaft of the motor 40. The brake has an electromagnetic clutch and a load connected to the rotation shaft of the motor 40 via the electromagnetic clutch. The electromagnetic clutch connects or disconnects the rotation shaft of the motor 40 from the load.

[0023] The load consists of a rotating disk or a rotational damper having a sufficiently large moment of inertia compared to the rotor of the motor 40, used to attenuate the rotational force of the rotor. It should be noted that the load in this invention is not limited to a rotating disk or a rotational damper, as long as it can attenuate the rotational force of the rotor.

[0024] [Motor Driver 30]

[0025] The motor driver 30 is a control board that uses various parameters representing the characteristics of the motor 40, such as the winding resistance, inductance, and number of poles, to estimate the rotor position and speed of the motor 40 and perform PI control relative to the speed or motor current. The motor driver 30 sends operation signals corresponding to the operation of operation switches provided on the instrument panel, etc., as control signals to the motor drive circuit 20 via signal lines (not shown).

[0026] The motor driver 30 has an input terminal 31 for receiving voltage from the switching circuit 50. When a voltage within a specified voltage range is input to the input terminal 31, the motor driver 30 outputs a drive signal to the motor drive circuit 20 to connect the rotating shaft of the motor 40 to the load and controls the electromagnetic clutch included in the motor drive circuit 20. On the other hand, when a voltage outside the specified voltage range is input to the input terminal 31, the motor driver 30 outputs a drive signal to the motor drive circuit 20 to disconnect the rotating shaft of the motor 40 from the load and controls the electromagnetic clutch.

[0027] [Electric motor 40]

[0028] In this embodiment, the electric motor 40 uses its power to open and close opening and closing mechanisms such as lift doors installed in a vehicle. The electric motor 40 is, for example, a three-phase brushless DC motor, comprising a rotor and a stator. The rotor has multiple permanent magnets with N and S poles and rotates about a rotation axis relative to the stator. The stator has three-phase drive coils. The three-phase drive coils generate an induced voltage corresponding to the rotational speed by rotating the rotor.

[0029] When the opening and closing mechanism is rapidly operated manually by the user, overvoltage may sometimes occur in the motor 40. In this case, the electronic components provided in the motor driver 30 (control board) may be damaged because the overvoltage is applied to the signal line (not shown). Therefore, the opening and closing mechanism control device 1 in this embodiment includes a switching circuit 50.

[0030] [Switching Circuit 50]

[0031] A switch circuit side path 12b is connected to terminal 51 of switch circuit 50. Terminal 52 of switch circuit 50 is connected to input terminal 31 of motor driver 30 via motor driver side path 13. It should be noted that overvoltage generated in motor 40 is applied to terminal 51 via motor drive circuit side path 12a and switch circuit side path 12b.

[0032] The switching circuit 50 switches the magnitude of the voltage input to the input terminal 31 of the motor driver 30 according to the magnitude of the overvoltage applied to the terminal 51.

[0033] The switching circuit 50 includes Zener diodes ZD1 and ZD2, resistors R1, R2, R3, R4, R5, R6, diodes D1, D2, D3, D4, transistor Q1, and MOSFET (Metal Oxide Semiconductor Field Effect Transistor) Q2.

[0034] [Zener diode ZD1, diodes D1 and D2]

[0035] The cathode of Zener diode ZD1 is connected to terminal 51 of switching circuit 50, and the anode of diode D1 is connected to the anode of Zener diode ZD1. Zener diode ZD1 is a voltage limiting element that conducts above a predetermined Zener voltage VZ1. Therefore, when the voltage input to terminal 51 is above the predetermined Zener voltage VZ1, 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.

[0036] [Transistor Q1, Resistors R1, R2, R3]

[0037] The junction CP1, where the cathodes of diodes D1 and D2 are connected to each other, is connected to the base of transistor Q1 via resistor R1. Resistor R2 is placed between the collector and base of transistor Q1. Resistor R3 is connected to the collector. The emitter of transistor Q1 is grounded.

[0038] When the voltage input to terminal 51 of the switching circuit 50 is above a predetermined Zener voltage VZ1, the base current flows, transistor Q1 is turned on (conducting state), and the collector current flows. When the voltage input to terminal 51 is less than the predetermined Zener voltage VZ1, the base current does not flow, therefore transistor Q1 is turned off (non-conducting state), and the collector current does not flow. It should be noted that the resistance values ​​of resistors R1 and R2 are set based on the ratio of base current to collector current, i.e., current amplification. Furthermore, resistor R3 is set based on the collector current.

[0039] [MOSFETQ2]

[0040] The anode of Zener diode ZD1 is connected to the gate terminal of MOSFET Q2 via resistor R3, transistor Q1, and diode R3. The cathode of Zener diode ZD1 (terminal 51) is connected to the source terminal of MOSFET Q2. Terminal 52 is connected to the drain terminal of MOSFET Q2. In this embodiment, MOSFET Q2 is a P-channel MOSFET, with a lower potential at the gate than the source. It is turned on (conducting state) when the potential difference between the source and gate is above a threshold value. As a result, current flows from terminal 52 in the switching circuit 50 to the motor driver side path 13, applying a voltage to the input terminal 31 of the motor driver 30. On the other hand, it is turned off (non-conducting state) when the potential difference between the source and gate is less than the threshold value, or when the gate and source have the same potential or the gate is higher than the source. As a result, current does not flow from terminal 52 to the motor driver side path 13, and therefore no voltage is applied to the input terminal 31.

[0041] [Resistor R4]

[0042] A resistor R4 is provided between the source terminal and the gate terminal. The resistance value of resistor R4 is set such that when a potential difference is generated across resistor R4 due to the applied current applied to the terminal 51 of the switching circuit 50, the potential difference between the source and the gate is above a threshold value.

[0043] The MOSFET Q2 has limitations in its use. For example, the potential difference between the source and gate is limited to a predetermined range. The potential difference between the source and gate increases depending on the magnitude of the applied current to the terminal 51 of the switching circuit 50. Furthermore, if the potential difference between the source and gate exceeds the maximum permissible voltage, the MOSFET Q2 may be damaged.

[0044] [Zener Diode ZD2]

[0045] Between the source and gate terminals, a Zener diode ZD2, used to protect MOSFET Q2, is connected in parallel with a resistor R4. The Zener diode ZD2 short-circuits the source and gate by energizing it before the potential difference between the source and gate exceeds the aforementioned maximum permissible voltage. By short-circuiting the source and gate, MOSFET Q2 is in an off-state, thereby preventing damage to MOSFET Q2.

[0046] [Diodes D3, D4]

[0047] Diodes D3 and D4 are provided between the source and gate of MOSFET Q2 to prevent electrostatic discharge (ESD) damage. The anodes of diodes D3 and D4 are connected to each other, the cathode of diode D3 is connected to the source terminal, and the cathode of diode D4 is connected to the gate terminal.

[0048] [Action of opening / closing control device 1]

[0049] Next, the operation of the opening / closing control device 1 will be explained. It should be noted that in the following explanation, the opening / closing control device 1 is in a de-energized state. Specifically, as shown by the dashed line in the drive system power supply circuit 60, power is not supplied from the drive system power supply to the motor drive circuit 20, and the control system power supply circuit 10 is in a state where power is not supplied from the control system power supply 11 to the motor drive circuit 20 and the motor driver 30, respectively.

[0050] When the switch is opened or closed rapidly by the user's manual operation, the motor 40 may generate electricity and produce an overvoltage. As a result, an overcurrent flows from the motor drive circuit 20 in the motor drive circuit side path 12a and the switch circuit side path 12b, applying an overvoltage to the terminal 51 of the switch circuit 50.

[0051] When the overvoltage applied to terminal 51 of the switching circuit 50 is greater than or equal to the Zener voltage VZ1, the Zener diode ZD1 is energized, the base current flows in transistor Q1, and transistor Q1 is turned on (conducting state), thereby allowing the collector current to flow. Consequently, in MOSFET Q2, the potential difference between the source and gate is greater than or equal to the threshold value, thereby turning on MOSFET Q2 (energized state).

[0052] When MOSFET Q is turned on, current flows from terminal 52 of the switching circuit 50 to the motor driver-side path 13, applying voltage to the input terminal 31 of the motor driver 30. With voltage applied to the input terminal 31, a drive signal is output from the motor driver 30 to the motor drive circuit 20, controlling the electromagnetic clutch in the motor drive circuit 20 to connect the rotation shaft of the motor 40 to the load. This brakes the motor 40, thus suppressing overvoltage caused by manual operation by the user. As a result, damage to the motor driver 30 can be prevented.

[0053] On the other hand, if the overvoltage applied to terminal 51 of the switching circuit 50 is less than the Zener voltage VZ1, the Zener diode ZD1 is not energized, and therefore transistor Q1 is turned off. Consequently, MOSFET Q2 is turned off.

[0054] With MOSFET Q2 disconnected, current does not flow from terminal 52 of the switching circuit 50 to the motor driver side path 13. Therefore, no voltage is applied to the input terminal 31 of the motor driver 30, and no drive signal is output from the motor driver 30 to the motor drive circuit 20. The electromagnetic clutch in the motor drive circuit 20 disconnects the rotating shaft of the motor 40 from the load. However, the overvoltage is low, so the motor driver 30 is unlikely to be damaged.

[0055] As described above, even when not powered on, the state of having voltage applied to the input terminal 31 of the motor driver 30 and the state of not having voltage applied are switched according to the magnitude of the voltage applied to the terminal 51 of the switching circuit 50, thereby preventing damage to the motor driver 30.

[0056] The opening / closing body control device 1 according to an embodiment of the present invention includes: a brake for braking a motor that drives the opening / closing body; a motor driver 30 for controlling the brake to brake the motor 40 when a voltage is applied to a predetermined input terminal 31; and a switching circuit 50 for applying voltage to the predetermined input terminal 31 based on the generated overvoltage when the motor 40 generates electricity and generates an overvoltage of a predetermined value or higher.

[0057] According to the above structure, even when the motor 40 is not powered on, if it generates an overvoltage exceeding a predetermined value, voltage is applied to a predetermined input terminal 31 of the motor driver 30 to control the brake and brake the motor 40, thus preventing damage to the motor driver 30. Furthermore, because of the switching circuit 50, overvoltage of the motor 40 can be detected even when the power supply to the motor driver 30 is disconnected, reducing power consumption. It should be noted that, in the powered-on state, the above structure also applies voltage to the predetermined input terminal 31 of the motor driver 30 to brake the motor 40 when the motor 40 generates an overvoltage exceeding a predetermined value, just as in the unpowered state.

[0058] Furthermore, the switching circuit 50 in this embodiment includes a voltage limiting element, such as a Zener diode, that conducts when a voltage exceeding a predetermined value is generated. Thanks to the voltage limiting element in the switching circuit 50, the switching circuit 50 can be reliably switched on when a voltage exceeding a predetermined value is applied to the terminal 51 of the switching circuit 50.

[0059] Furthermore, the switching circuit 50 in this embodiment includes a MOSFET Q2, which is disposed between the motor 40 and a predetermined input terminal 31. When a voltage is generated, the MOSFET Q2 enables conduction between the motor 40 and the input terminal 31. By providing the MOSFET Q2 between the motor 40 and the predetermined input terminal 31, in the event of an overvoltage applied to the terminal 51 of the switching circuit, the MOSFET Q2 reliably enables conduction between the motor 40 and the input terminal 31. Conversely, in the event of an acceptable voltage (not considered an overvoltage) applied to the terminal 51, the MOSFET Q2 reliably disconnects the motor 40 from the input terminal 31.

[0060] Furthermore, the voltage limiting element of the switching circuit 50 is a Zener diode ZD1 that breaks down and conducts when a voltage exceeding a predetermined value is generated. MOSFET Q2 is a P-channel MOSFET. The anode of Zener diode ZD1 is disposed on the gate terminal side of the P-channel MOSFET, the cathode of Zener diode ZD1 is disposed on the source terminal side of the P-channel MOSFET, and a predetermined input terminal 31 is disposed on the drain terminal side of the P-channel MOSFET. Because the anode of Zener diode ZD1 is disposed on the gate terminal side of the MOSFET and the anode of Zener diode ZD1 is disposed on the source terminal side of the P-channel MOSFET, MOSFET Q2 can be reliably turned on when the voltage applied to terminal 51 is above the Zener voltage, and MOSFET Q2 can be reliably turned off when the voltage applied to terminal 51 is below the Zener voltage.

[0061] It should be noted that resistors R3 and R4, as well as Zener diode ZD2, described in the above embodiments are not essential. For example, by changing the specifications of MOSFET Q2, resistors R3 and R4, and Zener diode ZD2 can be omitted.

[0062] Furthermore, the Zener diode ZD1 and diodes D1 and D2 described in the above embodiments are not essential. For example, by eliminating the 12V power supply, Zener diode ZD1 and diodes D1 and D2 can be removed.

[0063] Furthermore, in the above embodiment, the transistor Q1 and MOSFET Q2, which are two elements, can also be a transistor array that is a single element. By replacing two elements with a single element, the number of elements and the mounting area can be reduced.

[0064] Furthermore, in the above embodiment, a voltage detection circuit or the like can be used instead of the Zener diode ZD1. This allows the switching circuit 50 to be turned on at a specified voltage detected by the voltage detection circuit, thus improving the accuracy of the switching circuit 50's operation.

[0065] Furthermore, the above embodiments are merely illustrative examples of implementing the present invention and are not intended to limit the scope of the invention. That is, the present invention can be implemented in various forms without departing from its spirit or main features.

[0066] Industrial applicability

[0067] The present invention is an effective opening and closing device that can prevent damage to the control board even when an overvoltage occurs in a non-energized state.

[0068] Explanation of reference numerals in the attached figures

[0069] diodes D1, D2, D3, and D4

[0070] Q1 transistor

[0071] Q2 MOSFET

[0072] Resistors R1, R2, and R3

[0073] ZD1 Zener diode

[0074] ZD2 Zener diode

[0075] 1. Opening and closing control device

[0076] 10 Control System Power Supply Circuit

[0077] 11 Control System Power Supply

[0078] 12 Control System Power Cord

[0079] 12a motor drive circuit side path

[0080] 12b switch circuit side path

[0081] 13 Motor driver side path

[0082] 20 Motor Drive Circuit

[0083] 22 Braking Circuit

[0084] 30 motor drive

[0085] 31 input terminals

[0086] 40 electric motor

[0087] 50 Switching Circuit

[0088] 51 terminal

[0089] 52 terminal

[0090] 60 drive system power supply circuit

Claims

1. An opening / closing control device, comprising: The braking circuit brakes the motor that drives the opening and closing mechanism; A control circuit, having a predetermined input terminal, controls the braking circuit to brake the motor when a signal is input to that input terminal; and A switching circuit configures the path of current flowing between the motor side and the input terminal to be able to connect or disconnect. In the event that the motor generates electricity and applies an overvoltage of more than a predetermined value to the path, the path is connected so that the signal is input to the predetermined input terminal via the path.

2. The opening and closing body control device according to claim 1, wherein, The switching circuit has a Zener diode that can connect the path in the event of an overvoltage exceeding the predetermined value.

3. The opening and closing body control device according to claim 2, wherein, The switching circuit has a MOSFET that is configured on the path and connected in the event of the overvoltage.

4. The opening and closing body control device according to claim 3, wherein, The MOSFET is a P-channel MOSFET, with the anode of the Zener diode disposed on the gate terminal side of the P-channel MOSFET, the cathode of the Zener diode disposed on the source terminal side of the P-channel MOSFET, and the predetermined input terminal disposed on the drain terminal side of the P-channel MOSFET.

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