JP2005212717A - Switch device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch device for controlling an automobile lighting device, wiper driving device or the like that can ensure reliable operation free of malfunction due to noise by a simple structure. <P>SOLUTION: The switch device is so designed that controlling means 12 detect opening/closing signals of a plurality of switch contacts of switch means 11 simultaneously, and when only one of the plurality of opening/closing signals is a closing signal and the others are opening signals, output a predetermined driving signal depending on the closing signal. If a strong electric field environment superposes noise on the plurality of opening signals to make more than one closing signal, the controlling means 12 do not output the driving signal, so that the switch device can ensure reliable operation free of malfunction by a simple structure dispensing with noise absorbing capacitors or the like. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a switch device that mainly controls a lighting device such as a fog light or a turn signal of an automobile, a driving device of a wiper, and the like.

  In recent years, as the number of functions and functions of automobiles has been increasing, lighting devices such as fog lights and turn signals, and switch devices used in wiper drive devices, microcomputers, etc., can be used according to contact / separation signals input from the switch means. There is an increasing number of control means that output and control drive signals to lighting devices and drive devices.

  Such a conventional switch device will be described with reference to FIGS.

  FIG. 6 is a block circuit diagram of a conventional switch device. In FIG. 6, reference numeral 1 denotes a switch means such as a rocker switch, and a fixed contact in which the movable contact 1A is grounded in accordance with an operation of an operation unit (not shown). By moving around 1B, the switch contacts are formed such that electrical contact is made between the fixed contacts 1B and 1C or between the fixed contacts 1B and 1D.

  Reference numeral 2 denotes a control means composed of electronic parts such as a microcomputer. The input section 2A is connected to the fixed contact 1D of the switch means 1 and has a resistance so as to have the same potential as the power supply of the microcomputer in the control means 2. 3 to the power supply circuit 4.

  The input unit 2A is also connected to a noise absorbing capacitor 5, one of which will be described later, which is grounded.

  Furthermore, the output part 2B of the control means 2 is connected to the input part 6A of the lighting device 6 such as a fog lamp which is a driving means to constitute a switch device.

  In the above configuration, as shown in FIG. 6, when the movable contact 1A is in contact with the fixed contacts 1B and 1C and the switch means 1 is OFF, as shown on the left side of the signal waveform diagram of FIG. Since a high-potential H signal is input to the input unit 2A of the control unit 2, the control unit 2 determines that the switch unit 1 is OFF by this H signal and turns off the output unit 2B. The driving signal is output, and the lighting device 6 is turned off.

  Then, for example, after the time T, when the operation unit of the switch means 1 is operated and the movable contact 1A moves and comes into contact with the fixed contacts 1B and 1D as shown in the block circuit diagram of FIG. As shown on the right side of (a), the signal input to the control means 2 changes from an H signal to an L signal having a low potential by a connection signal. The lighting device 6 lights up.

  At this time, the control means 2 determines whether the potential from the switch means 1 is high or low with reference to a predetermined threshold voltage value S, thereby detecting the connection or open state of the switch contacts.

  In addition, when an automobile equipped with such a switch device passes under a high-voltage cable or near a radio tower, or is used in a strong electric field environment such as near a radio, as shown in FIG. Noise N is generated in the input signal to the control means 2.

  For example, when the switch means 1 is in the OFF state and a high potential H signal is input to the control means 2 and the noise N is superimposed on the H signal, the potential of the H signal is the noise N for a predetermined time. Thus, the voltage drops to a potential lower than the threshold voltage value S, and the L signal is input to the control means 2.

  For this reason, although the switch means 1 is in the OFF state, the control means 2 detects the L signal and determines that it is in the ON state, and temporarily turns on the lighting device 6 such as a fog lamp. May occur.

  Therefore, in order to prevent such malfunction of the control means 2 due to noise N, a capacitor 5 having an effective frequency that absorbs noise of a specific frequency is interposed between the input section 2A connected to the switch means 1 and the ground. It is configured to be connected, thereby absorbing noise and preventing malfunction.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP-A-6-344825

  However, in the above conventional switch device, it is necessary to connect a capacitor 5 to the control means 2 in order to prevent malfunction due to noise N. This capacitor 5 has an effective frequency that absorbs noise of a specific frequency. Therefore, in order to prevent the superposition of noises of various frequencies, a large number of capacitors are required, and when a switch means formed of a large number of switch contacts is used, a large number of capacitors are provided for each switch contact. There was a problem that it was necessary to connect.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a switch device that can operate reliably even in a use environment where noise is easily generated with a simple configuration.

  In order to achieve the above object, according to the present invention, the control means simultaneously detects contact / separation signals of a plurality of switch contacts of the switch means, and only one of the plurality of contact / separation signals is a connection signal and the other is opened. The switch device is configured to output a predetermined drive signal in response to the connection signal when the signal is a separation signal, and noise is superimposed on a plurality of separation signals in a strong electric field environment. In the case where the number is not one, but the control means does not output a drive signal, a noise absorbing capacitor is unnecessary, and a switch device capable of reliable operation with no malfunction is obtained with a simple configuration. Has the effect of being able to

  As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to realize a switch device that can operate reliably without a malfunction due to noise with a simple configuration.

  Embodiments of the present invention will be described below with reference to FIGS.

  In addition, the same code | symbol is attached | subjected to the part of the structure same as the structure demonstrated in the term of the prior art, and detailed description is simplified.

(Embodiment)
FIG. 1 is a block circuit diagram of a switch device according to an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a switch means such as a rocker switch, and a movable contact 11A is moved along with an operation of an operation unit (not shown). By moving around the fixed contact 11B connected to the ground, a plurality of switch contacts are formed so that electrical connection / disconnection is performed between the fixed contacts 11B and 11C or between the fixed contacts 11B and 11D. .

  Reference numeral 12 denotes a control means composed of electronic parts such as a microcomputer. The fixed contact 11D of the switch means 11 is connected to the input section 12A, the fixed contact 11C is connected to the input section 12B, and the fixed contact 11B is connected to the ground. It is connected.

  Further, the input parts 12A and 12B of the control means 12 are connected to the power supply circuit 4 having a voltage of 5V through the resistors 3 so that they have the same potential as the power supply of the microcomputer in the control means 12, and the output part 12C The input unit 6A of the lighting device 6 such as a fog lamp as a driving means is connected.

  Further, the control means 12 simultaneously detects a plurality of contact / separation signals input to the input units 12A and 12B, and outputs a predetermined drive signal to the lighting device 6 only when these signals are different from each other. Thus, a switch device is configured.

  In the above configuration, as shown in FIG. 1, when the movable contact 11A is in contact with the fixed contacts 11B and 11C and the switch means 11 is OFF, the signal shown in FIG. A signal as shown on the left side of the waveform diagram is input to the input unit 12B, and a signal as shown on the left side of FIG.

  That is, the fixed contacts 11B and 11D are separated, and the fixed contact 11C is connected to the fixed contact 11B connected to the ground via the movable contact 11A. H signal is input, and a low potential L signal is input to the input section 12B as a connection signal.

  Then, the control means 12 simultaneously detects the contact / separation signals of the plurality of switch contacts from the switch means 11, the H signal of the separation signal is input to the input section 12A, and the connection signal different from this is input to the input section 12B. In response to the connection signal to the input unit 12B, the control unit 12 determines that the switch unit 11 is OFF, and a drive signal for turning off the light is output from the output unit 12C. The lighting device 6 is turned off.

  At this time, the control means 12 determines whether the potential from the switch means 11 is high or low with reference to a predetermined threshold voltage value S of, for example, 2.5 V, thereby determining whether the switch contact is connected or disconnected. Detected.

  Next, for example, after the time T1, when the operation unit of the switch unit 11 is operated and the movable contact 11A moves and contacts the fixed contacts 11B and 11D as shown in the block circuit diagram of FIG. 3 (a) and 3 (b), the L signal, which is a connection signal, is input to the input section 12A of the control means 12, and the H signal, which is a separation signal, is input to the input section 12B. The means 12 detects these contact / separation signals simultaneously, and according to the connection signal to the input unit 12A, the control means 12 determines that the switch means 11 is ON, outputs a lighting drive signal, and the lighting device 6 lights up. To do.

  In addition, when an automobile equipped with such a switch device passes under a high-voltage cable or near a radio tower or is used in a strong electric field environment such as near a radio device, noise N is added to the input signal to the control means 12. Will occur.

  Then, for example, as shown in FIG. 1, the switch means 11 is in the OFF state, and as shown in the signal waveform diagram of FIG. As shown in FIG. 4B, when the connection signal L signal is input to 12B and noise N is superimposed on them, the potential of the H signal in FIG. The voltage drops to a potential lower than the voltage value S, and the L signal is input to the input unit 12A for a predetermined time.

  However, even if the noise N is superimposed on the signal input to the input unit 12B in FIG. 4B, the signal changes to a lower potential and remains the L signal. And 12B are input with L signal.

  At this time, when only one of these signals is the L signal of the connection signal and the other is the H signal of the separation signal, the control means 12 lights the driving signal for lighting in accordance with this connection signal. Since it is configured to output to the device 6, when a plurality of L signals are input as described above, the control means 12 does not output a drive signal, and the lighting device 6 is kept off. .

  That is, as in the case shown in FIG. 3, when the switch unit 11 is normally operated and the contact / separation of a plurality of switch contacts is switched, a driving signal for turning on / off is output from the control unit 12. However, when the noise N is superimposed on the H signal of the separation signal as in the case of FIG. 4, the drive signal is not output.

  As described above, according to the present embodiment, the control unit 12 simultaneously detects the contact / separation signals of the plurality of switch contacts of the switch unit 11, and only one of the plurality of contact / separation signals is a connection signal. When the switch device is configured to output a predetermined drive signal in response to the connection signal when noise is a separation signal, noise is superimposed on the plurality of separation signals in a strong electric field environment, and the connection signal When the number is not one, but the control means 12 does not output a drive signal, a noise absorbing capacitor or the like is not required, and a switch device capable of a reliable operation with a simple configuration and no malfunction. Can be obtained.

  In the above description, the switch means 11 has a so-called one-circuit two-contact configuration in which the fixed contact points 11B and 11C or the fixed contact points 11B and 11D are electrically connected and disconnected by operating the movable contact point 11A. The switch device for turning on and off the lighting device 6 has been described. Next, a switch device for controlling a wiper driving device and the like with one circuit multi-contact will be described.

  Normally, in such a switch device, as shown in the block circuit diagram of FIG. 5, the other end of the movable contact 21A, one end of which is connected to the fixed contact 21B, is fixed to the fixed contacts 21C, 21D, 21E by an operation such as rotation. , 21F, one-circuit multi-contact switch means 21 is used to switch the wiper to OFF, intermittent drive, normal drive, high-speed drive, or the like.

  The fixed contacts 21C to 21F of the switch means 21 are connected to the input sections 22A, 22B, 22C, and 22D of the control means 22 connected to the power supply circuit 4 through resistors, respectively, and to the control means 22 The wiper drive device 23 is connected to form a switch device.

  In the above configuration, when the movable contact 21A is in contact with the fixed contacts 21B and 21C, the L signal of the connection signal is input to the input unit 22A, and the H signal of the separation signal is input to the other input units 22B to 22D. Yes.

  Then, the control means 22 detects the contact / separation signals of the plurality of switch contacts at the same time, and judges that only the input portion 22A is the L signal of the connection signal and the other input portions are the H signal of the separation signal, A drive signal for turning OFF, that is, stopping is output to the wiper driving device 23.

  Next, when the movable contact 21A is moved by operating the switch means 21 and the fixed contacts 21B and 21D are in contact with each other, the L signal of the connection signal is transmitted only to the input section 22B, and the disconnection signal is transmitted to the other input sections. Since the H signal is input, the control means 22 outputs an intermittent drive signal to the wiper drive device 23, and the wiper is intermittently driven.

  Similarly, when the fixed contacts 21B and 21E or the fixed contacts 21B and 21F come into contact with each other, the connection signal L signal is input only to the input section 22C or 22D, and the disconnection signal H signal is input to the other input sections. Therefore, a drive signal for normal driving or high-speed driving is output from the control means 22 to the wiper driving device 23.

  In addition, when used in a strong electric field environment, for example, when the fixed contacts 21B and 21C are in contact with each other and the connection signal L signal is input only to the input unit 22A, and the wiper driving device 23 is stopped, noise N is present in each input signal. When it occurs, the H signal of the separation signal of the input units 22B to 22D drops to a potential lower than the threshold voltage value S due to noise N, and the L signal is input for a predetermined time, but is input to the input unit 22A. Even if the noise N is superimposed on the existing signal, it changes to a lower potential and remains the L signal.

  Therefore, since the L signal of the connection signal is input to all the input units, when only one is the connection signal and the other is the separation signal, the control means 22 that outputs a predetermined drive signal detects this. The drive signal is not output.

  That is, even in the switching device using the switching means 21 having one circuit and multiple contacts as described above, when noise is superimposed on a plurality of opening signals in a strong electric field environment, the number of connection signals is not one, but a plurality. Since the control means 22 is configured not to output a drive signal, it is not necessary to connect a noise absorbing capacitor or the like to the input portions 22A to 22D, and a simple operation and a reliable operation can be achieved. A possible switch device can be obtained.

  The switch device according to the present invention is useful for controlling a lighting device such as an automobile or a wiper device because a switch device with a simple configuration and capable of a reliable operation without malfunction can be realized.

1 is a block circuit diagram of a switch device according to an embodiment of the present invention. Block circuit diagram during the same operation Same signal waveform diagram Signal waveform diagram when the noise is superimposed Block circuit diagram according to another embodiment Block circuit diagram of a conventional switch device Block circuit diagram during the same operation Same signal waveform diagram

Explanation of symbols

3 Resistance 4 Power supply circuit 6 Lighting device 6A Input section 11 Switch means 11A, 21A Movable contact 11B, 11C, 11D Fixed contact 12, 22 Control means 12A, 12B, 22A, 22B, 22C, 22D Input section 21 Switch means 21B, 21C , 21D, 21E, 21F Fixed contact 23 Wiper drive device

Claims (1)

It comprises switch means for electrically connecting / disconnecting a plurality of switch contacts, and control means for outputting a drive signal in response to a contact / separation signal from the switch means, wherein the control means is a plurality of switch contacts of the switch means. Simultaneously, when only one of the plurality of contact / separation signals is a connection signal and the other is a separation signal, the control means determines a predetermined drive signal according to the connection signal. Switch device that outputs.

Images