JPH0551000U - Motor drive circuit - Google Patents

Abstract

(57) [Abstract] [Purpose] When using multiple motors, reduce the number of relays and corresponding transistors and diodes,
It is to achieve a significant cost reduction. A drive circuit of a motor for performing an operation such as opening and closing a door of a vehicle, wherein n (n is a plurality) motors 21 and 22 capable of normal rotation and reverse rotation, and the motor 21,
N + 1 relays 31, 32, 33 connected in parallel to the motor 22 for giving a rotation signal to the motor, and relays in response to the operation of four operation switches 23, 24, 25, 26 as external operation members. A drive selection circuit 27 for outputting a drive signal to each of 31, 32 and 33. [Effect] It is sufficient that there are n + 1 switching elements corresponding to n motors, and the number of switching elements and the number of transistors and diodes can be reduced, resulting in a large cost reduction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor drive circuit for causing a motor to perform operations such as opening and closing a vehicle window.

[0002]

[Prior Art]

 Conventionally, it has been said that something like a car is a mechanical device, but in recent years, even such cars have become increasingly electronic, and even manual operations that were previously performed can be operated with a single switch each year. You can do it. That is, in these operations, the signal of the switch is processed by the electronic circuit, and the target is operated by rotating the motor based on the signal. One such thing is the opening and closing of car windows. A so-called 4-door type car has four doors, and each door has a window. These windows are changing from the conventional manual method of opening and closing the window by turning the glass up and down by turning the knob to a power window device as an opening and closing mechanism that automatically opens and closes by a motor. Although such a power window device has recently come to be seen, in the past, one window corresponds to one motor to perform opening and closing operations. A conventional technique will be described below with reference to the drawings by taking a device for opening and closing a car window as an example. FIG. 6 shows a motor drive circuit for opening and closing a window according to the prior art. In the figure, the case of one motor is explained, but in reality, the number of circuits corresponds to the number of windows. In the figure, a motor 1 is for opening and closing a window, and can perform both forward rotation and reverse rotation for opening and closing. The manual switch 2 is a switch for closing the window by opening the glass. One terminal of the switch 2 is connected to the base of the transistor 4 via the resistor 3. The emitter of the transistor 4 is connected to the ground, and the collector of the transistor 4 is connected to the relay 5 described later. The relay 5 is composed of a magnet coil 6 and a contact 7. One of the magnet coils 6 is connected to the collector of the transistor 4, and the other is connected to the other terminal of the switch 2 and to one movable contact of the contact 7. The fixed contact of the contact 7 is connected to the motor 1, and the other point of the movable contact is connected to the ground. A diode 8 for preventing a reverse current flowing when the relay 5 is turned off is connected in parallel to the magnet coil 6 of the relay 5.

On the other hand, the switch 9 is a switch for opening the window by making the glass DOWN. The connection from the switch 9 to the motor 1 is exactly the same as the connection on the closed side. That is, one terminal of the switch 9 is connected to the base of the transistor 11 via the resistor 10. The emitter of the transistor 11 is connected to ground and the collector is connected to the relay 12. The relay 12 is composed of a magnet coil 13 and a contact 14. One of the magnet coil 13 is connected to the collector of the transistor 11, the other is connected to the other terminal of the switch 9 and a movable contact of the contact 14. It is connected. The fixed contact of the contact 14 is connected to the motor 1, and the other point of the movable contact is connected to the ground. A diode 15 for preventing a reverse current flowing when the relay 12 is turned off is connected in parallel to the magnet coil 13 of the relay 12.

The operation of FIG. 6 will be described. First, the case of opening a window will be described. When the switch 9 is closed, the transistor 11 is turned on via the resistor 10. As a result, the magnet coil 13 of the relay 12 is excited and the contact 14 moves to the V side. Accordingly, a current flows through the motor 1, and the motor 1 rotates in the normal direction, for example, in the direction of arrow 16. The rotation of the motor 1 lowers the glass and opens the window. On the other hand, when closing the window, when the switch 2 is closed, the transistor 4 is turned on via the resistor 3. As a result, the magnet coil 6 of the relay 5 is excited, the contact 7 moves to the V side, and a current flows through the motor 1. This causes the motor 1 to rotate in the reverse direction and rotate in the direction of arrow 17, whereby the glass rises and the window closes.

[0005]

[Problems to be solved by the device]

 In the above-mentioned conventional technique, two relays are required to drive one motor corresponding to each of UP and DOWN switches, which increases the cost of the drive circuit. In addition, two transistors and two diodes are required to correspond to this relay, further increasing the cost. Moreover, since the number of parts required for the circuit increases as described above, the drive circuit itself becomes complicated. In particular, the larger the number of windows, the larger the number of motors, and thus the circuit was complicated.

The present invention has been made to solve the above problems, and when using a plurality of motors, reduce the number of relays and the corresponding number of transistors and diodes. The purpose is to achieve a significant cost reduction.

[0007]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention is a drive circuit of a motor for performing operations such as opening and closing a window of a vehicle, in which n (n is a plurality) motors capable of forward and reverse rotation. And n + 1 switching elements connected in parallel to the motor for supplying a drive current to the motor, an operation switch as an external operation member for rotating the motor forward or reverse, and operation of the operation switch. And a selection circuit for selectively outputting a drive signal to each of the switching elements in response to.

[0008]

[Action]

 By separating the signals of the 2n operation switches by the selection circuit and selectively driving the necessary elements of the n + 1 switching elements to cause the n motors to perform the required operations, for example, It is used to open and close multiple windows of a car.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Similar to the prior art, a power window device of an automobile will be described as an example, but the present invention is not limited to this embodiment. FIG. 1 shows a motor driving circuit for opening and closing a window according to the present invention. The number of motors may be any as long as it is plural, but in the embodiment, the case of two motors will be described. That is, let us consider two of the four windows of an automobile, one of which is seat A and the other is seat B. In the figure, motors 21 and 22 are for opening and closing windows as in the prior art, and both motors can perform both forward rotation and reverse rotation for opening and closing. The right rotation 71 of the motor 21 closes the A seat window, the left rotation 72 opens the A seat window, the left rotation 73 of the motor 22 closes the B seat window, and the right rotation 74 opens the B seat window. I shall.

The manual external operation member has four switches 23, 24, 25, and 26 depending on the number of windows and the opening and closing of the windows. The switch 23 is a switch for closing the window by making the glass of the A seat UP, and the switch 24 is a switch for opening the window of the A seat by making it DOWN. The switch 25 is a switch for closing the window by opening the glass of the B seat, and the switch 26 is a switch for opening the window of the B seat by DOWN. One of the switches 23, 24, 25, and 26 is connected to a relay described later, and the other is connected to the drive selection circuit 27.

One of the drive selection circuits 27 is connected to the ground, and the other three output signals, that is, the first output line 101, the second output line 102, and the third output line 103, have the transistors 28 and 29 in this order. , 30 connected to the base. The emitters of the transistors 28, 29 and 30 are connected to the ground, and the collectors are connected to the relays 31, 32 and 33. Next, the relay 31 is composed of a magnet coil 34 and a contact 35. One of the magnet coil 34 is connected to the collector of the transistor 28, the other is connected to each switch terminal and the constant voltage side movable contact of the contact 35. It is connected to the. The relay 32 is composed of a magnet coil 36 and a contact 37. One of the magnet coil 36 is connected to the collector of the transistor 29 and the other is connected to each switch terminal and to the constant voltage side movable contact of the contact 37. ing. Further, the relay 33 is composed of a magnet coil 38 and a contact 39. One of the magnet coil 38 is connected to the collector of the transistor 30 and the other is connected to each switch terminal and to the constant voltage side movable contact of the contact 39. .. The fixed contact of the contact 35 is connected to the motor 21, the fixed contact of the contact 37 is connected to the motor 21 and the motor 22, and the fixed contact of the contact 39 is connected to the motor 22. The magnet coils 34, 35, 36 of the relay are connected in parallel with diodes 40, 41, 42 for preventing reverse current flowing when the relays are turned off. The directions of the currents flowing through the motors are A seat window open (glass DOWN), A seat window closed (glass UP), B seat window open (glass DOWN), and B seat window closed (glass UP).

FIG. 2 is a circuit diagram showing a detailed circuit example of the drive selection circuit 27 of FIG. FIG. 2 is composed of one NAND circuit, three OR circuits, and two AND circuits. The signal of the switch 23 is one input signal of the OR circuit 52. The signal of the switch 24 serves as one input signal of the NAND circuit 51 and also serves as one input signal of the OR circuits 53 and 54. The signal of the switch 25 serves as the other input signal of the NAND circuit 51 and also serves as the other input signal of the OR circuits 52 and 53. The signal of the switch 26 is the other input signal of the OR circuit 54. The output signal of the OR circuit 52 is one input signal of the AND circuit 55. The output signal of the OR circuit 54 is one input signal of the AND circuit 56. Further, the output signal of the NAND circuit 51 is the other input signal of the AND circuits 55 and 56. The output signal of the AND circuit 55 is the first output line 101 which is the output signal of the drive selection circuit 27, the output signal of the AND circuit 56 is the second output line 102 which is the output signal of the drive selection circuit 27, and The output signal of the OR circuit 53 becomes the third output line 103 which is the output signal of the drive selection circuit 27.

FIG. 3 is a cross-sectional view showing the structure of a window operation knob switch for the A seat or the B seat as a switch mechanism. The operation knob 60 has a circuit board 62 in a housing 61 and a rubber contact 63 for performing a switch operation on the circuit board 62. The rubber contact 63 is provided with an UP switch contact 64 and a DOWN switch contact 65. Further, the housing 61 is provided with a UP retainer 66 corresponding to the UP switch contact 64 and a DOWN retainer 67 corresponding to the DOWN switch contact 65 slidably. This switch forms a seesaw-type switch that moves to the right and left of the center line 70 around the fulcrum 69.

Next, the operation will be described. FIG. 4 is an explanatory diagram for explaining the rotation of the motor. 1 to 4, it is assumed that two operation knobs 60 are provided for the A seat window and the B seat window. The closing of the window of seat A will be described. When the A-seat operation knob 60 is tilted to the right, the UP switch contact 64 is turned on and the switch 23 is closed. As a result, the OR circuit 52 outputs the logic level "1" and the AND circuit 55 inputs it. Since the switch 24 is "0", the other of the AND circuits 55 is passing through the NAND circuit 51 and therefore "1" is input, so that the output is "1". As a result, the transistor 28 is turned on, electricity is supplied to the magnet coil 34 to be excited, and the contact point 35 is moved to the V side, whereby the motor 21 is normally rotated 71 as shown in FIG. UP and the window closes.

Next, the opening of the window of the A seat will be described. When the A-seat operation knob 60 is tilted to the left, the DOWN switch contact 65 is turned on and the switch 24 is closed. As a result, the OR circuit 53 directly outputs "1". As a result, the transistor 29 is turned on, electricity is supplied to the magnet coil 36 to be excited, and the contact 37 is moved to the V side, whereby the motor 21 is reversely rotated 72 as shown in FIG. DOWN and the window opens.

FIG. 4C is an operation diagram of the contact point where the glass in the A seat is UP to close the window and the glass in the B seat is DOWN to open the window at the same time. Detailed explanation is omitted. In any case, Table 1 shows a part of the operation modes showing the operations of FIG. 1 and FIG. In Table 1, “A +” is the same for the A seat window closed (glass UP), “A−” is the A seat window opened (glass DOWN), and the same applies to the B seat. The symbol "x" means simultaneous operation. Items not shown in the table are "(A-) x (B +)" and "(A +) x (B-)". In this case, the circuit of Fig. 2 gives priority to DOWN and the UP is in a standby state. Moreover, “(A +) × (A−)” and “(B +) × (B−)” cannot be seen from FIG.

[0017]

[Table 1] The priority of closing the window of the A seat and opening the window of the B seat will be described. In FIG. 2, switch 23 and switch 25 are closed. The NAND circuit 51 outputs "1", and the OR circuit 52 also outputs "1". Therefore, the output of the AND circuit 55 becomes "1" and the contact 35 is placed on the constant voltage side. However, with priority over this, the output of the OR circuit 52 becomes "1" and the contact 37 is tilted to the constant voltage side, and the priority is given to opening the B side window first. After that, the window on the A side is closed by the contact 35.

FIG. 5 shows another embodiment of the input section of the drive selection circuit 27 in the circuit of FIG. In the drawing, one of the switches 23, 24, 25 and 26 is connected to the drive selection circuit 27, while the other is directly connected to the ground. It goes without saying that such a connection method also has the same effect as the present invention.

[0019]

[Effect of the device]

 As described above, according to the present invention, since it is sufficient to have n + 1 switching elements corresponding to n motors, not only can the number of switching elements be reduced, but the number of switching elements can be reduced. The number of corresponding relays and diodes can also be reduced, which can greatly reduce the cost.

[Brief description of drawings]

FIG. 1 is a motor drive circuit for opening and closing a window according to the present invention.

FIG. 2 is a circuit diagram showing a detailed circuit example of a drive selection circuit 27 of FIG.

FIG. 3 is a cross-sectional view showing a structure of a window operation knob switch of a seat A or a seat B as a switch mechanism.

FIG. 4 is an explanatory diagram for explaining opening and closing of a window by rotation of a motor.

5 is a circuit diagram showing another embodiment of the input section of the drive selection circuit in the circuit of FIG.

FIG. 6 is a motor drive circuit for opening and closing a window according to the prior art.

[Explanation of symbols]

 21, 22 Motor 23, 24, 25, 26 Switch 27 Drive selection circuit 28, 29, 30 Transistor 31, 32, 33 Relay 34, 36, 38 Magnet coil 35, 37, 39 Contact 51 NAND circuit 52, 53, 54 OR Circuit 55, 56 AND circuit 60 Operation knob 62 Circuit board 63 Rubber contact 64 UP switch contact 65 DOWN switch contact 66, 67 Retainer

Claims (1)

[Scope of utility model registration request] 1. A drive circuit for a motor for opening and closing a window of a vehicle, which is capable of forward and reverse rotation (n is a plurality).
Motors, n + 1 switching elements connected in parallel to the motors to supply a drive current to the motors, operation switches as external operation members for rotating the motors forward or backward, A motor drive circuit comprising a drive selection circuit for selectively outputting a drive signal to each of the switching elements in response to a signal from an operation switch.