JP2012081914A - Motor driving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent motor malfunction during immersion by using an operation switch of a small number of contacts with a little contact capacity.SOLUTION: Transistors Q3 and Q6 are made into an off-state in detecting immersion by providing: a relay 2a for normal rotation; a relay 2b for reverse; a transistor Q4 which actuates the relay 2a for normal rotation; a transistor Q7 which actuates the relay 2b for reverse; a transistor Q3 which actuates the transistor Q4; a transistor Q6 which actuates the transistor Q7; an UP switch 5 for performing normal rotation of a motor 13; a DOWN switch 4 for reversing the motor 13; a CPU 11 which outputs a signal which makes the transistor Q3 on-state, when a normal rotation command signal is input from the UP switch 5, and outputs a signal which makes the transistor Q6 on-state, when a reverse command signal is input from the DOWN switch 4; and an immersion detection circuit 17 which detects the immersion.

Description

  The present invention relates to a motor drive device used for a power window device of a vehicle, and more particularly to a technique for preventing malfunction of a motor at the time of flooding.

  In a power window device that opens and closes a window of a vehicle by an electric motor, the motor is driven in a normal rotation direction or a reverse rotation direction to open and close the window according to the operation state of the operation switch. For example, when the operation switch is operated to the “close” side, the motor is driven in the forward direction and the window is closed, and when the operation switch is operated to the “open” side, the motor is driven in the reverse direction and the window is opened. Control of forward and reverse rotation of the motor is performed by switching the direction of the current flowing through the motor in the motor drive circuit based on the signal from the operation switch.

  Some power window devices have a water intrusion detection function for preventing the motor from malfunctioning due to water intrusion into the motor drive circuit when rainwater or the like enters or the vehicle is submerged. For example, in the power window device described in Patent Document 1 described later, when the inundation detection circuit detects inundation, the window closing relay and the window opening relay are simultaneously turned on to make both ends of the motor have a high potential. To do. As a result, the motor cannot be driven, and the malfunction of the motor during flooding is prevented.

  However, in the apparatus of Patent Document 1, when a deviation occurs in the timing when each relay is turned on at the time of flooding, both ends of the motor are not simultaneously at a high potential, and one end is at a high potential and the other end is at a low potential. Will occur. For this reason, a current may flow through the motor and the motor may malfunction.

  On the other hand, when inundation is detected, a power window device that prevents malfunction of the motor by making both the potentials of the coils of the window closing relay and the window opening relay both ground potentials is disclosed in the following patent document. 2. According to this apparatus, since the relay is not turned on at the time of flooding, the problem of Patent Document 1 can be avoided. In Patent Document 2, when inundation is detected, the transistor connected to the coil of each relay is turned on to set the potential at both ends of each coil to the ground potential so that the motor is not driven. When an operation for opening the window is performed in the inundation detection state, the coil of the window opening relay is energized through the contact of the operation switch, so that the motor is rotated forward to open the window. . For this reason, since the operation switch needs to be provided with a contact point for energizing the coil, the number of contact points of the operation switch is increased, and a contact point having a capacity corresponding to the coil current is required.

JP-A-11-36700 JP 2001-40939 A

  The present invention prevents the malfunction of the motor at the time of flooding by means different from those in Patent Documents 1 and 2 above. A main object of the present invention is to prevent malfunction of a motor at the time of flooding by using an operation switch having a small number of contacts and a small contact capacity.

  A motor driving device according to the present invention has a first contact connected to one end of a direct current motor, and grounds one end of the motor via the first contact in an off state, and the motor in an on state. And a second relay connected to the other end of the motor, and the other end of the motor is connected to the other end of the motor via the second contact. A reverse rotation relay that is grounded and connects the other end of the motor to the power source via the second contact when in the on state, and a first forward rotation semiconductor switching element that turns on the forward rotation relay when in the on state A first reverse semiconductor switching element that turns on the reverse relay when in the on state, and a second forward semiconductor switching element that turns on the first forward semiconductor switching element when in the on state And on Sometimes, the second reverse semiconductor switching element for turning on the first reverse semiconductor switching element, the normal rotation switch for normal rotation of the motor, the reverse rotation switch for reverse rotation of the motor, and the normal rotation switch When the forward rotation command signal is input from the output terminal, a signal for turning on the second forward rotation semiconductor switching element is output. On the other hand, when the reverse rotation command signal is input from the reverse rotation switch, the second reverse rotation semiconductor switching device is output. Control means for outputting a signal for turning on the element, and a flood detection circuit for detecting flood and outputting a flood detection signal are provided. When the inundation detection circuit detects inundation, the second forward rotation semiconductor switching element and the second reverse rotation semiconductor switching element are turned off based on the inundation detection signal.

  In this case, when water is detected, the second forward semiconductor switching element and the second reverse semiconductor switching element are both turned off, so the first forward semiconductor switching element and the first reverse semiconductor switching element. Both elements are turned off. For this reason, neither the forward rotation relay nor the reverse rotation relay operates, and the motor is not driven, so that malfunction of the motor at the time of flooding is prevented. Further, since it is not necessary to pass a current through the coil of each relay through the contact of the operation switch (forward switch and reverse switch), the operation switch does not need to have a coil energization contact. Therefore, the number of contacts can be reduced and the configuration of the operation switch can be simplified. In addition, since the contact point of the operation switch may be a small-capacity contact point through which a signal current flows, the cost can be suppressed.

  In the present invention, preferably, when a reverse rotation command signal is input from the reverse rotation switch to the control means in a state where the inundation detection circuit is detecting water inflow, the first reverse semiconductor switching element is forcibly turned on. To.

  In this way, by operating the reverse switch during flooding, the first reverse semiconductor switching element is turned on, and the reverse relay operates to reverse the motor. Therefore, for example, even when the vehicle is submerged, it is possible to open the window by rotating the motor in reverse by operating the reverse switch, so that safety can be ensured.

  Preferably, when a normal rotation command signal is input from the normal rotation switch to the control means in a state where the inundation detection circuit is detecting water immersion, the first normal rotation semiconductor switching element is maintained in an OFF state.

  Thus, when the forward rotation switch is operated at the time of flooding, the first forward rotation semiconductor switching element remains in an off state, and the forward rotation relay does not operate, so the motor does not rotate forward. Therefore, for example, when the vehicle is submerged, even if the forward rotation switch is operated, the motor does not rotate forward and the window does not close, so that safety can be further ensured.

  In the present invention, when a normal rotation command signal is input from the normal rotation switch to the control means in a state where the inundation detection circuit is detecting water immersion, the first normal rotation semiconductor switching element is forcibly turned on. It is good also as such a structure.

  If it does in this way, since the 1st semiconductor switching element for normal rotation will be in an ON state by operation of the switch for normal rotation, the relay for normal rotation will operate | move and a motor will rotate normally. Thereby, when it is necessary to rotate the motor forward at the time of flooding, the motor can be rotated forward.

  Further, in the present invention, when a normal rotation command signal is input from the normal rotation switch to the control means while the inundation detection circuit is detecting the inundation, the first normal rotation semiconductor switching element is forcibly turned on. When the reverse rotation command signal is input to the control means from the reverse rotation switch while the inundation detection circuit is detecting the flooding, the first reverse rotation semiconductor switching element is forcibly turned on. It is good.

  In this manner, when the forward rotation switch is operated during the flooding, the first forward rotation semiconductor switching element is turned on, so that the forward rotation relay operates and the motor rotates forward. Further, when the reverse rotation switch is operated at the time of flooding, the first reverse rotation semiconductor switching element is turned on, so that the reverse rotation relay operates and the motor reverses. Therefore, the motor can be rotated in a desired direction by operating any one of the switches during the flooding.

  According to the present invention, since the number of contacts of the operation switch is small and the contact capacity is small, it is possible to prevent malfunction of the motor at the time of flooding by using an operation switch with a simple configuration.

It is the block diagram which showed the whole structure of the power window apparatus. It is the figure which showed the example of the window opening / closing mechanism. 1 is a circuit diagram showing a motor drive device according to a first embodiment of the present invention. It is a figure explaining the transition of the circuit state at the time of UP switch operation. It is a figure explaining the transition of the circuit state at the time of UP switch operation. It is a figure explaining the transition of the circuit state at the time of UP switch operation. It is a figure explaining the transition of the circuit state at the time of UP switch and AUTO switch operation. It is a figure explaining the transition of the circuit state at the time of UP switch and AUTO switch operation. It is a figure explaining the transition of the circuit state at the time of DOWN switch operation. It is a figure explaining the transition of the circuit state at the time of DOWN switch operation. It is a figure explaining the transition of the circuit state at the time of DOWN switch operation. It is a figure explaining the transition of the circuit state at the time of DOWN switch and AUTO switch operation. It is a figure explaining the transition of the circuit state at the time of DOWN switch and AUTO switch operation. It is a figure explaining the transition of the circuit state at the time of inundation detection. It is a figure explaining the transition of the circuit state at the time of inundation detection. It is a figure explaining the transition of a circuit state when a DOWN switch is operated at the time of inundation detection. It is a figure explaining the transition of a circuit state when a DOWN switch is operated at the time of inundation detection. It is a figure explaining the transition of a circuit state when a DOWN switch is operated at the time of inundation detection. It is a figure explaining the transition of a circuit state when UP switch is operated at the time of inundation detection. It is a figure explaining the transition of a circuit state when UP switch is operated at the time of inundation detection. It is the circuit diagram which showed the motor drive device which concerns on 2nd Embodiment of this invention. It is the circuit diagram which showed the motor drive device which concerns on 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, a case where the present invention is applied to a power window device will be described as an example.

  As shown in FIG. 1, the power window device includes a motor driving device 100 according to the present invention, a motor 13 driven by the motor driving device 100, a window opening / closing mechanism 14 driven by the motor 13, and a motor. And a rotational speed detection sensor 16 for detecting the rotational speed of 13. The motor drive device 100 includes a CPU 11 constituting a control means, a motor drive circuit 12 for driving the motor 13, a switch circuit 15 having an operation switch, and an inundation detection circuit 17 for detecting inundation. The motor driving device 100 will be described later in detail.

  FIG. 2 is a view showing an example of the window opening / closing mechanism 14. The window opening / closing mechanism 14 includes a pinion 60, a sector gear 61, a bracket 62, a first arm 63, a second arm 64, a guide member 65, and a support member 66.

  The pinion 60 is rotationally driven by the motor 13. A rotation speed detection sensor 16 is connected to the motor 13. The sector gear 61 is fixed to the first arm 63 and meshes with the pinion 60. The support member 66 is attached to the lower end of the window glass 51. One end of the first arm 63 is connected to the support member 66, and the other end is rotatably supported by the bracket 62. The second arm 64 has one end connected to the support member 66 and the other end supported by the guide member 65. The 1st arm 63 and the 2nd arm 64 are connected via the axis | shaft in each intermediate part.

  As the motor 13 rotates, the pinion 60 and the sector gear 61 rotate, and the first arm 63 rotates. Following this, the other end of the second arm 64 slides laterally along the groove of the guide member 65. As a result, the support member 66 moves in the vertical direction according to the rotation direction of the motor 13, and the window glass 51 moves up and down in conjunction with the support member 66. When the motor 13 rotates normally, the window glass 51 rises and the window 50 closes. When the motor 13 rotates reversely, the window glass 51 descends and the window 50 opens. Thus, the opening / closing operation of the window 50 is performed by operating the window opening / closing mechanism 14 by the rotation of the motor 13.

<First Embodiment>
FIG. 3 shows the motor drive device 100 according to the first embodiment of the present invention. In FIG. 3, the same parts as those in FIG. First, the configuration of the motor drive device 100 will be described with reference to FIG.

  The CPU 11 controls the overall operation of the motor driving apparatus 100 and includes terminals T1 to T6. T1 is an UP output terminal that outputs a signal for raising the window glass 51 and closing the window 50 by forward rotation of the motor 13. T2 is a DOWN output terminal that outputs a signal for lowering the window glass 51 and opening the window 50 by the reverse rotation of the motor 13. T3 is a DOWN input terminal to which a reverse rotation command signal for rotating the motor 13 is input. T4 is an UP input terminal to which a normal rotation command signal for normal rotation of the motor 13 is input. T5 is an AUTO input terminal to which a continuation command signal for continuing normal rotation or reverse rotation of the motor 13 is input. T6 is a rotation speed input terminal to which the rotation speed is input. The output terminals T1 and T2 are connected to the motor drive circuit 12, the input terminals T3 to T5 are connected to the switch circuit 15, and the input terminal T6 is connected to the rotation speed detection sensor 16. The rotation speed detection sensor 16 is composed of, for example, a rotary encoder.

  In the motor drive circuit 12, the motor 13 is a direct current motor, and the contact Y1 (first contact) of the forward relay 2a is connected to one end thereof, and the contact Y2 (second contact) of the reverse relay 2b is connected to the other end. Contact) is connected. X1 and X2 are coils of the forward relay 2a and the reverse relay 2b, respectively. When the coil X1 is not energized and the forward relay 2a is off, the contact Y1 is in the state shown in the figure, and one end of the motor 13 is grounded via the contact Y1. When the coil X2 is not energized and the reverse relay 2b is off, the contact Y2 is in the state shown in the figure, and the other end of the motor 13 is grounded via the contact Y2. On the other hand, when the coil X1 is energized and the forward relay 2a is turned on, the contact Y1 is switched, and one end of the motor 13 is connected to the power source B3 via the contact Y1. When the coil X2 is energized and the reverse relay 2b is turned on, the contact Y2 is switched, and the other end of the motor 13 is connected to the power source B3 via the contact Y2.

  One end of the coil X1 of the forward relay 2a is connected to the collector of a transistor Q4 (first forward semiconductor switching element), and the other end of the coil X1 is grounded. The emitter of the transistor Q4 is connected to the power supply B2. A protective Zener diode Z1 is connected between the collector and emitter of the transistor Q4. A resistor R9 is connected between the base and emitter of the transistor Q4. The base of the transistor Q4 is connected to the collector of the transistor Q3 (second forward rotation semiconductor switching element) via the resistor R8. The emitter of the transistor Q3 is grounded. A resistor R7 is connected between the base and emitter of the transistor Q3. The base of the transistor Q3 is connected to the UP output terminal T1 of the CPU 11 via the resistor R6 and the resistor R3. The collector of the transistor Q2 is connected to the connection point between the resistor R6 and the resistor R3. The emitter of the transistor Q2 is grounded. A resistor R5 is connected between the base and emitter of the transistor Q2. The base of the transistor Q2 is connected to the collector of the transistor Q1 of the water immersion detection circuit 17 to be described later via a resistor R4.

  One end of the coil X2 of the reverse relay 2b is connected to the collector of the transistor Q7 (first reverse semiconductor switching element), and the other end of the coil X2 is grounded. The emitter of the transistor Q7 is connected to the power supply B2. A protective Zener diode Z2 is connected between the collector and emitter of the transistor Q7. A resistor R16 is connected between the base and emitter of the transistor Q7. The base of the transistor Q7 is connected to the collector of the transistor Q6 (second reverse semiconductor switching element) via the resistor R15. The base of the transistor Q7 is connected to one end of a DOWN switch 4 of the switch circuit 15 described later via a resistor R15 and a diode D1. The emitter of the transistor Q6 is grounded. A resistor R14 is connected between the base and emitter of the transistor Q6. The base of the transistor Q6 is connected to the DOWN output terminal T2 of the CPU 11 via the resistor R13 and the resistor R10. The collector of the transistor Q5 is connected to the connection point between the resistor R13 and the resistor R10. The emitter of the transistor Q5 is grounded. A resistor R12 is connected between the base and emitter of the transistor Q5. The base of the transistor Q5 is connected to the collector of the transistor Q1 of the water immersion detection circuit 17 to be described later via a resistor R11.

  The switch circuit 15 includes three switches: a DOWN switch 4 (reverse rotation switch), an UP switch 5 (forward rotation switch), and an AUTO switch 6 (rotation continuation switch) as operation switches. One end of the DOWN switch 4 is connected to the DOWN input terminal T3 of the CPU 11 via the diode D2. The anode of the diode D2 is connected to the power supply B4 via the resistor R17, and the cathode of the diode D1 is connected to the cathode of the diode D2. The other end of the DOWN switch 4 is grounded. One end of the UP switch 5 is connected to the UP input terminal T4 of the CPU 11 and is connected to the power source B5 via the resistor R18. One end of the AUTO switch 6 is connected to the AUTO input terminal T5 of the CPU 11 and is connected to the power source B6 via the resistor R19.

  In the inundation detection circuit 17, the collector of the transistor Q1 is connected to the base of the transistor Q2 of the motor drive circuit 12 via the resistor R4, and is connected to the base of the transistor Q5 of the motor drive circuit 12 via the resistor R11. It is connected. The voltage at the collector of the transistor Q1 is applied to the transistors Q2 and Q5 as a flood detection signal. The emitter of the transistor Q1 is connected to the power supply B1. A resistor R1 is connected between the base and emitter of the transistor Q1. The base of the transistor Q1 is connected to one electrode 1a of the water immersion detection pad 1 via a resistor R2. The other electrode 1b of the immersion detection pad 1 is grounded.

  Next, the operation of the motor drive device 100 described above will be described separately in the following cases (1) to (5).

(1) When UP operation is performed without flooding

  In the state without water immersion, as shown in FIG. 3, the electrodes 1a and 1b of the water detection pad 1 are open, so that the transistor Q1 is in the OFF state. For this reason, a flood detection signal is not output from the flood detection circuit 17 to the motor drive circuit 12, and the transistors Q2 and Q5 are in the OFF state. When the UP operation is performed from this state and the UP switch 5 is turned on as shown in FIG. 4, a current flows from the power source B5 through the resistor R18 and the UP switch 5. (A broken line arrow indicates a current path. The same applies hereinafter.) Therefore, the potential of the UP input terminal T4 becomes a low level (hereinafter referred to as “L”). That is, a normal rotation command signal that is an “L” signal is input from the UP switch 5 to the UP input terminal T4.

  When determining that the forward rotation command signal is input to the UP input terminal T4, the CPU 11 outputs a high level (hereinafter, referred to as “H”) signal to the UP output terminal T1, as shown in FIG. For this reason, current flows from the base of the transistor Q3 to the emitter via the resistor R3 and the resistor R6, and the transistor Q3 is turned on. Then, since the collector of the transistor Q3 becomes “L”, a current flows from the emitter to the base of the transistor Q4, and the transistor Q4 is turned on. When the transistor Q4 is turned on, a current flows from the power source B2 through the emitter and collector of the transistor Q4, and this current flows to the coil X1 of the forward relay 2a.

  When a current flows through the coil X1, the forward relay 2a is turned on as shown in FIG. 6, and the contact Y1 is switched from the ground side to the power source side. As a result, a current flows through the path of the power source B3 → contact Y1 → motor 13 → contact Y2 → ground, and the motor 13 rotates normally. Thereby, the window glass 51 (FIG. 2) rises and the window 50 closes.

  When the UP switch 5 is turned OFF, the UP input terminal T4 becomes “H”, and the “L” signal is output from the UP output terminal T1. For this reason, the transistors Q3 and Q4 are turned off, so that no current flows through the coil X1, and the forward relay 2a is turned off. As a result, the contact Y1 is switched from the power supply side to the ground side, so that the motor 13 stops because no current flows. Thereby, the raise of the window glass 51 stops.

  As shown in FIG. 7, when both the UP switch 5 and the AUTO switch 6 are turned on, a forward rotation command signal which is an “L” signal is input to the UP input terminal T4, and “L” is input to the AUTO input terminal T5. ”Signal, which is a rotation continuation command signal. As a result, an “H” signal is output to the UP output terminal T1. Therefore, similarly to the above, the transistors Q3 and Q4 are turned on, a current flows through the coil X1, and the forward relay 2a is turned on. Then, the contact Y1 is switched from the ground side to the power supply side, a current flows through the motor 13, the motor 13 rotates normally, and the window 50 is closed.

  Here, after the UP switch 5 and the AUTO switch 6 are turned ON, as shown in FIG. 8, even if both switches (or one switch) are turned OFF, the “H” signal continues from the UP output terminal T1. Is output. For this reason, the motor 13 continues normal rotation, the window glass 51 rises, and the window 50 closes. When the CPU 11 determines that the rotational speed input from the rotational speed detection sensor 16 to the rotational speed input terminal T6 has reached a predetermined value, the CPU 11 stops outputting the “H” signal from the UP output terminal T1. . As a result, the transistors Q3 and Q4 are turned off, so that no current flows through the coil X1, and the forward relay 2a is turned off. As a result, the contact Y1 is switched from the power supply side to the ground side, so that the motor 13 stops because no current flows. Thereby, the raise of the window glass 51 stops and it will be in the state which the window 50 closed completely.

(2) When a DOWN operation is performed without flooding

  In the state without water immersion, as shown in FIG. 3, the electrodes 1a and 1b of the water detection pad 1 are open, so that the transistor Q1 is in the OFF state. For this reason, a flood detection signal is not output from the flood detection circuit 17 to the motor drive circuit 12, and the transistors Q2 and Q5 are in the OFF state. When a DOWN operation is performed from this state and the DOWN switch 4 is turned on as shown in FIG. 9, a current flows from the power source B4 through the resistor R17, the diode D2, and the DOWN switch 4. For this reason, the potential of the DOWN input terminal T3 becomes “L”. That is, a reverse rotation command signal that is an “L” signal is input from the DOWN switch 4 to the DOWN input terminal T3.

  When the CPU 11 determines that the reverse rotation command signal is input to the DOWN input terminal T3, the CPU 11 outputs an “H” signal to the DOWN output terminal T2, as shown in FIG. Therefore, a current flows from the base of the transistor Q6 to the emitter via the resistor R10 and the resistor R13, and the transistor Q6 is turned on. Then, since the collector of the transistor Q6 becomes “L”, a current flows from the emitter to the base of the transistor Q7, and the transistor Q7 is turned on. When the transistor Q7 is turned on, a current flows from the power source B2 through the emitter / collector of the transistor Q7, and this current flows to the coil X2 of the reverse relay 2b.

  When a current flows through the coil X2, as shown in FIG. 11, the reverse relay 2b is turned on, and the contact Y2 is switched from the ground side to the power source side. As a result, a current flows through the path of power source B3 → contact Y2 → motor 13 → contact Y1 → ground, and the motor 13 rotates in the reverse direction. Thereby, the window glass 51 (FIG. 2) descends and the window 50 opens.

  When the DOWN switch 4 is turned OFF, the DOWN input terminal T3 becomes “H”, and an “L” signal is output from the DOWN output terminal T2. For this reason, the transistors Q6 and Q7 are turned off, so that no current flows through the coil X2, and the reverse relay 2b is turned off. As a result, the contact Y2 is switched from the power supply side to the ground side, so that the motor 13 stops because no current flows. Thereby, the descent of the window glass 51 is stopped.

  In addition, as shown in FIG. 12, when both the DOWN switch 4 and the AUTO switch 6 are turned ON, a reverse rotation command signal which is an “L” signal is input to the DOWN input terminal T3, and “L” is input to the AUTO input terminal T5. A rotation continuation command signal as a signal is input. As a result, an “H” signal is output to the DOWN output terminal T2. Therefore, similarly to the above, the transistors Q6 and Q7 are turned on, a current flows through the coil X2, and the reverse relay 2b is turned on. Then, the contact Y2 is switched from the ground side to the power supply side, a current flows through the motor 13, the motor 13 is reversed, and the window 50 is opened.

  Here, after the DOWN switch 4 and the AUTO switch 6 are turned ON, as shown in FIG. 13, even if both switches (or one switch) are turned OFF, the “H” signal continues from the DOWN output terminal T2. Is output. For this reason, the motor 13 continues to reverse, the window glass 51 descends, and the window 50 opens. When the CPU 11 determines that the rotational speed input from the rotational speed detection sensor 16 to the rotational speed input terminal T6 has reached a predetermined value, the CPU 11 stops outputting the “H” signal from the DOWN output terminal T2. . As a result, the transistors Q6 and Q7 are turned off, so that no current flows through the coil X2, and the reverse relay 2b is turned off. As a result, the contact Y2 is switched from the power supply side to the ground side, so that the motor 13 stops because no current flows. Thereby, the descent | fall of the window glass 51 stops and it will be in the state which the window 50 opened completely.

(3) When inundation occurs

  When water intrusion into the motor drive circuit 100 occurs due to rainwater intrusion or vehicle submergence, the electrodes 1a and 1b of the water immersion detection pad 1 are electrically connected by water as shown in FIG. Therefore, as shown in FIG. 15, a current flows from the emitter to the base of the transistor Q1, and the transistor Q1 is turned on. Then, a current flows from the power supply B1 through the emitter and collector of the transistor Q1, and the collector of the transistor Q1 becomes “L”. Therefore, a flood detection signal that is an “L” signal is output from the flood detection circuit 17 to the motor drive circuit 12.

  The transistor Q2 of the motor drive circuit 12 is turned on by this flood detection signal. As a result, the base of the transistor Q3 becomes “L” and the transistor Q3 is turned off, and the base of the transistor Q4 becomes “H” and the transistor Q4 is turned off. Further, the transistor Q5 of the motor drive circuit 12 is also turned on by the flood detection signal. As a result, the base of the transistor Q6 becomes “L”, the transistor Q6 is turned off, the base of the transistor Q7 becomes “H”, and the transistor Q7 is turned off.

  In this way, when the flooding occurs, the transistors Q4 and Q7 are both turned off based on the flooding detection signal output from the flooding detection circuit 17, so that the reverse rotation relay is also connected to the coil X1 of the forward rotation relay 2a. No current flows through the coil 2 of 2b. Therefore, since the contacts Y1 and Y2 of both relays are not switched to the power source side, the motor 13 is not energized from the power source B3, and the motor 13 does not rotate. Accordingly, it is possible to prevent the window 13 from being opened and closed inadvertently by operating the motor 13 even when the switches 4 to 6 are not operated during flooding.

(4) When a DOWN operation is performed in a flooded state

  In the state where the flooding occurs, the transistor Q1 is turned on and the flooding detection circuit 17 outputs the flooding detection signal, so that the transistors Q4 and Q7 are both turned off as described with reference to FIG. In this state, when the DOWN switch 4 is turned on as shown in FIG. 16, the base of the transistor Q7 is grounded via the resistor R15, the diode D1, and the DOWN switch 4 as shown in FIG. Therefore, the base of the transistor Q7 becomes “L”, and the transistor Q7 is forcibly turned on. On the other hand, the transistor Q4 remains off.

  When the transistor Q7 is turned on, a current flows from the power source B2 through the transistor Q7 to the coil X2 of the reverse relay 2b. Therefore, as shown in FIG. 18, the reverse relay 2b is turned on, and the contact Y2 is switched from the ground side to the power source side. As a result, a current flows through the path of power source B3 → contact Y2 → motor 13 → contact Y1 → ground, and the motor 13 rotates in the reverse direction. Thereby, the window glass 51 descend | falls and the window 50 opens.

  Thus, when the DOWN switch 4 is operated at the time of flooding, the motor 13 reverses and the window 50 opens so that even when the vehicle is submerged, the window is opened by the operation of the DOWN switch 4 to escape. It becomes possible. Thereby, safety can be ensured.

(5) When UP operation is performed in the flooded state

  In the state where the flooding occurs, the transistor Q1 is turned on and the flooding detection circuit 17 outputs the flooding detection signal, so that the transistors Q4 and Q7 are both turned off as described with reference to FIG. When the UP switch 5 is turned on as shown in FIG. 19 from this state, as shown in FIG. 20, a normal rotation command signal which is an “L” signal is input from the UP switch 5 to the UP input terminal T4. . When the CPU 11 determines that the forward rotation command signal is input to the UP input terminal T4, the CPU 11 outputs an “H” signal to the UP output terminal T1. However, since the transistor Q2 is in the ON state due to the inundation detection signal from the inundation detection circuit 17, the transistor Q3 maintains the OFF state even if the “H” signal is output from the UP output terminal T1. Therefore, since the transistor Q4 also remains in the OFF state, no current flows through the coil X1 of the forward relay 2a, and the forward relay 2a is not turned ON. Therefore, since the contact Y1 is not switched to the power supply side, no current flows from the power supply B3 to the motor 13, and the motor 13 does not rotate forward.

  In this way, when the UP switch 5 is operated at the time of flooding, the motor 13 is not rotated in the forward direction. Therefore, even if the UP switch 5 is operated when the vehicle is submerged, the window does not close. For this reason, escape from a window is not prevented and safety can be ensured more.

  According to the first embodiment described above, when water is detected, the transistors Q3 and Q6 are both turned off, so that the transistors Q4 and Q7 are both turned off. For this reason, neither the forward rotation relay 2a nor the reverse rotation relay 2b operates, and the motor 13 is not driven, so that the malfunction of the motor 13 during flooding is prevented.

  Further, since it is not necessary to pass a current through the coils X1 and X2 of the relays 2a and 2b through the contacts of the operation switches (switches 4 to 6), the operation switch does not need to have a coil energization contact. Therefore, compared with the apparatus of the above-mentioned patent document 2, the number of contacts is small, and the configuration of the operation switch can be simplified. In addition, since the contact point of the operation switch may be a small-capacity contact point through which a signal current flows, the cost can be suppressed.

  Further, in the first embodiment, the operation of the transistors Q2 to Q7 provided in the preceding stage of the forward rotation relay 2a and the reverse rotation relay 2b prevents the current from flowing through the coils X1 and X2 of each relay at the time of flooding. For this reason, if the transistor circuit portion is covered with resin, there is no possibility of short circuit or leakage occurring in the transistor circuit due to water immersion, and the malfunction of the motor 13 during water immersion can be more effectively prevented.

<Second Embodiment>
FIG. 21 shows a motor drive device 200 according to the second embodiment of the present invention. In FIG. 21, the same or corresponding parts as in FIG. In the motor drive device 100 according to the first embodiment described above, the window 15 is opened by reversing the motor 13 by operating the DOWN switch 4 during flooding. On the other hand, in the motor driving device 200 of FIG. 21, the UP switch 5 is operated at the time of flooding, so that the motor 13 is rotated forward and the window 50 is closed.

  In the motor drive device 200, the base of the transistor Q4 is connected to one end of the UP switch 5 via a resistor R8 and a diode D3. One end of the UP switch 5 is connected to the UP input terminal T4 of the CPU 11 via the diode D4. The anode of the diode D4 is connected to the power source B5 via the resistor R18, and the cathode of the diode D3 is connected to the cathode of the diode D4. The other end of the UP switch 5 is grounded.

  The operation when the UP switch 5 is operated during flooding is as follows. In the state where the flooding occurs, the transistor Q1 is turned on and the flooding detection circuit 17 outputs the flooding detection signal, so that the transistors Q4 and Q7 are both turned off as described with reference to FIG. When the UP switch 5 is turned on from this state, the base of the transistor Q4 is grounded via the resistor R8, the diode D3, and the UP switch 5. Therefore, the base of the transistor Q4 becomes “L”, and the transistor Q4 is forcibly turned on. On the other hand, the transistor Q7 remains off.

  When the transistor Q4 is turned on, a current flows from the power source B2 through the transistor Q4 to the coil X1 of the forward relay 2a. Accordingly, the forward relay 2a is turned on, and the contact Y1 is switched from the ground side to the power source side. As a result, a current flows through the path of the power source B3 → contact Y1 → motor 13 → contact Y2 → ground, and the motor 13 rotates normally. Thereby, the window glass 51 rises and the window 50 is closed.

  Further, when the DOWN switch 4 is operated at the time of flooding, an “H” signal is output to the DOWN output terminal T2. However, since the transistor Q5 is turned on by the flooding detection signal, the transistor Q6 is turned off. To maintain. Therefore, since the transistor Q7 is also in the OFF state, no current flows through the coil X2 of the reverse relay 2b, and the reverse relay 2b is not turned ON. Therefore, since the contact Y2 is not switched to the power supply side, no current flows from the power supply B3 to the motor 13, and the motor 13 does not reverse.

  As described above, in the motor drive device 200 of the second embodiment, when the UP switch 5 is operated at the time of flooding, the motor 13 is rotated forward and the window 50 is closed. For this reason, for example, when rainwater enters from the window 50 and water enters the motor drive circuit 12, the window 50 can be closed to prevent rainwater from entering. Since the other effects of the second embodiment are the same as those of the first embodiment, description thereof is omitted.

<Third Embodiment>
FIG. 22 shows a motor drive device 300 according to the third embodiment of the present invention. 22, the same reference numerals are given to the same or corresponding parts as those in FIG. 3. The motor drive device 300 according to the third embodiment has both the function of the motor drive device 100 according to the first embodiment and the function of the motor drive device 200 according to the second embodiment.

  In the motor drive device 300, the base of the transistor Q7 is connected to one end of the DOWN switch 4 via the resistor R15 and the diode D5. One end of the DOWN switch 4 is connected to the DOWN input terminal T3 of the CPU 11 via the diode D7. The anode of the diode D7 is connected to the power supply B4 via the resistor R17, and the cathode of the diode D5 is connected to the cathode of the diode D7. The other end of the DOWN switch 4 is grounded.

  Further, the base of the transistor Q4 is connected to one end of the UP switch 5 via a resistor R8 and a diode D6. One end of the UP switch 5 is connected to the UP input terminal T4 of the CPU 11 via the diode D8. The anode of the diode D8 is connected to the power source B5 via the resistor R18, and the cathode of the diode D6 is connected to the cathode of the diode D8. The other end of the UP switch 5 is grounded.

  The operation when the DOWN switch 4 is operated at the time of flooding is as follows. In the state where the flooding occurs, the transistor Q1 is turned on and the flooding detection circuit 17 outputs the flooding detection signal, so that the transistors Q4 and Q7 are both turned off as described with reference to FIG. When the DOWN switch 4 is turned on from this state, the base of the transistor Q7 is grounded via the resistor R15, the diode D5, and the DOWN switch 4. Therefore, the base of the transistor Q7 becomes “L”, and the transistor Q7 is forcibly turned on. On the other hand, the transistor Q4 remains off.

  When the transistor Q7 is turned on, a current flows from the power source B2 through the transistor Q7 to the coil X2 of the reverse relay 2b. Therefore, the reverse relay 2b is turned on, and the contact Y2 is switched from the ground side to the power source side. As a result, a current flows through the path of power source B3 → contact Y2 → motor 13 → contact Y1 → ground, and the motor 13 rotates in the reverse direction. Thereby, the window glass 51 descend | falls and the window 50 opens.

  The operation when the UP switch 5 is operated at the time of flooding is as follows. In the state where the flooding occurs, the transistor Q1 is turned on and the flooding detection circuit 17 outputs the flooding detection signal, so that the transistors Q4 and Q7 are both turned off as described with reference to FIG. When the UP switch 5 is turned on from this state, the base of the transistor Q4 is grounded via the resistor R8, the diode D6, and the UP switch 5. Therefore, the base of the transistor Q4 becomes “L”, and the transistor Q4 is forcibly turned on. On the other hand, the transistor Q7 remains off.

  When the transistor Q4 is turned on, a current flows from the power source B2 through the transistor Q4 to the coil X1 of the forward relay 2a. Accordingly, the forward relay 2a is turned on, and the contact Y1 is switched from the ground side to the power source side. As a result, a current flows through the path of the power source B3 → contact Y1 → motor 13 → contact Y2 → ground, and the motor 13 rotates normally. Thereby, the window glass 51 rises and the window 50 is closed.

  When the DOWN switch 4 and the UP switch 5 are operated at the same time during the flooding, both the transistors Q4 and Q7 are turned on, so that both the forward relay 2a and the reverse relay 2b are turned on. For this reason, the contacts Y1 and Y2 are both switched from the ground side to the power supply side. At this time, since one end and the other end of the motor 13 are both connected to the power supply B3 and are at the same potential, the motor 13 is rotated forward and reverse. do not do.

  As described above, in the motor drive device 300 of the third embodiment, when the DOWN switch 4 is operated at the time of flooding, the motor 13 reverses and the window 50 is opened, and when the UP switch 5 is operated at the time of flooding, the motor 13 Is rotated forward and the window 50 is closed. For this reason, the motor can be rotated in a desired direction by operating any one of the switches 4 and 5 at the time of flooding. Since the other effects of the third embodiment are the same as those of the first embodiment, description thereof is omitted.

  In the present invention, various embodiments other than those described above can be adopted. For example, in the first embodiment, when the DOWN switch 4 is operated at the time of flooding, the base of the transistor Q7 is grounded via the resistor R15, the diode D1, and the DOWN switch 4, thereby forcing the transistor Q7. Thus, it was turned on (FIG. 17). Instead, when the inundation detection signal from the inundation detection circuit 17 is taken into the CPU 11 and the DOWN switch 4 is operated during the inundation (that is, when the inundation detection signal and the reverse rotation command signal are input to the CPU 11), the transistor The CPU 11 may be configured to output a signal for forcibly turning on Q7. In this case, the transistors Q2 and Q5, the diodes D1 and D2, and the resistors R4, R5, R11, and R12 are unnecessary.

  Similarly, in the second embodiment, when the UP switch 5 is operated at the time of flooding, the base of the transistor Q4 is grounded via the resistor R8, the diode D3, and the UP switch 5, so that the transistor Q4 is grounded. Forcibly turned ON (FIG. 21). Instead, when the inundation detection signal from the inundation detection circuit 17 is taken into the CPU 11 and the UP switch 5 is operated during the inundation (that is, when the inundation detection signal and the forward rotation command signal are input to the CPU 11), The CPU 11 may be configured to output a signal for forcibly turning on the transistor Q4. In this case, the transistors Q2 and Q5, the diodes D3 and D4, and the resistors R4, R5, R11, and R12 are unnecessary.

  Similarly, in the third embodiment, when the DOWN switch 4 is operated at the time of flooding, the base of the transistor Q7 is grounded via the resistor R15, the diode D5, and the DOWN switch 4, thereby causing the transistor Q7 to be grounded. When the UP switch 5 is operated during flooding, the transistor Q4 is forcibly turned on by grounding the base of the transistor Q4 through the resistor R8, the diode D6, and the UP switch 5 The state was set (FIG. 22). Instead, when the inundation detection signal from the inundation detection circuit 17 is taken into the CPU 11 and the DOWN switch 4 is operated during the inundation (that is, when the inundation detection signal and the reverse rotation command signal are input to the CPU 11), the transistor A signal for forcibly turning on Q7 is output from the CPU 11, and when the UP switch 5 is operated at the time of flooding (that is, when the flooding detection signal and the forward rotation command signal are input to the CPU 11), the transistor Q4 The CPU 11 may be configured to output a signal for forcibly turning on the CPU 11. In this case, the transistors Q2 and Q5, the diodes D5 to D8, and the resistors R4, R5, R11, and R12 are unnecessary.

  In each of the embodiments described above, a normal transistor is used as the semiconductor switching element in the motor drive circuit 12, but an FET (field effect transistor) or the like may be used as the semiconductor switching element.

  In the embodiment, an example in which only one AUTO switch 6 common to forward rotation and reverse rotation is provided has been described. However, an AUTO switch for forward rotation and an AUTO switch for reverse rotation may be provided separately.

  Furthermore, in the said embodiment, although the example which applied this invention to the power window apparatus of the vehicle was given, this invention is applicable not only to a power window apparatus but a sunroof opening / closing apparatus etc., for example.

2a Forward relay 2b Reverse relay 4 DOWN switch (Reverse switch)
5 UP switch (Forward rotation switch)
11 CPU (control means)
13 Motor 17 Inundation detection circuit 100, 200, 300 Motor drive device Q4 transistor (first switching semiconductor switching element)
Q3 transistor (second semiconductor switching element for normal rotation)
Q7 transistor (first switching semiconductor switching element)
Q6 transistor (second semiconductor switching element for reverse rotation)
Y1 Forward relay contact (first contact)
Y2 Reverse relay contact (second contact)

Claims (5)

A first contact connected to one end of the direct current motor; one end of the motor is grounded via the first contact in an off state, and one end of the motor is connected to the first contact in an on state Forward relay connected to the power source via
A second contact connected to the other end of the motor; the other end of the motor is grounded via the second contact in the off state; and the other end of the motor is connected to the second in the on state. A reverse relay connected to the power source via two contacts;
A first forward semiconductor switching element for turning on the forward relay when in the on state;
A first reverse semiconductor switching element for turning on the reverse relay when in an on state;
A second forward-rotating semiconductor switching element that turns on the first forward-rotating semiconductor switching element when in the on-state;
A second reversing semiconductor switching element for turning on the first reversing semiconductor switching element when in the on state;
A normal rotation switch for normal rotation of the motor;
A reverse switch for reversing the motor;
When a normal rotation command signal is input from the normal rotation switch, a signal to turn on the second normal rotation semiconductor switching element is output, while when a reverse rotation command signal is input from the reverse rotation switch, Control means for outputting a signal for turning on the second reversing semiconductor switching element;
An inundation detection circuit that detects inundation and outputs an inundation detection signal;
When the inundation detection circuit detects inundation, the second forward rotation semiconductor switching element and the second reverse rotation semiconductor switching element are turned off based on the inundation detection signal. . The motor drive device according to claim 1,
If the reverse rotation command signal is input from the reverse rotation switch to the control means while the flood detection circuit is detecting flooding, the first reverse semiconductor switching element is forcibly turned on. The motor drive device characterized by the above-mentioned. In the motor drive device according to claim 2,
When the forward rotation command signal is input to the control means from the forward rotation switch while the flooding detection circuit is detecting flooding, the first forward rotation semiconductor switching element is maintained in an off state. The motor drive device characterized by this. The motor drive device according to claim 1,
When the forward rotation command signal is input to the control means from the forward rotation switch while the inundation detection circuit is detecting flooding, the first forward rotation semiconductor switching element is forcibly turned on. A motor drive device characterized by that. The motor drive device according to claim 1,
When the forward rotation command signal is input to the control means from the forward rotation switch while the flooding detection circuit is detecting flooding, the first forward rotation semiconductor switching element is forcibly turned on. ,
If the reverse rotation command signal is input from the reverse rotation switch to the control means while the flood detection circuit is detecting flooding, the first reverse semiconductor switching element is forcibly turned on. The motor drive device characterized by the above-mentioned.

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