JP2016131206A - Printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed board that can be employed regardless of whether or not a switch is provided outside.SOLUTION: A conductive connection member can be connected between connections 1a, 1b. A switch 2 to be mounted alternatively to the connection member can be connected with connections 2d, 2b. The connection 2a controls the switch 2. A terminal 4 is connected with connections 1b, 2b. A switch 5 changes the potential of the connections 1a, 2a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a printed circuit board, and more particularly to a circuit board that can be connected to a plurality of types of loads.

  The automobile is provided with a door lock motor. This door lock motor is connected to a power source via a relay. When the relay is turned on, the power supply is connected to the door lock motor, and when the relay is turned off, the door lock motor is disconnected from the power supply.

  A drive circuit for driving the relay is mounted on a printed circuit board. On the other hand, the relay may be mounted on the printed board or provided outside the printed board. Therefore, conventionally, a printed circuit board corresponding to each of them has been created separately.

  Patent Documents 1 and 2 are posted as technologies related to the present invention.

JP 2014-209824 A Japanese Patent Laid-Open No. 04-010322

  It is desired to use the same printed circuit board regardless of whether or not the switch is provided outside.

  Therefore, an object of the present application is to provide a printed circuit board that can be employed regardless of whether a switch is provided outside.

  1st aspect of the printed circuit board concerning this invention is a printed circuit board, Comprising: Opening / closing is controlled by the electric potential of the 1st connection part and 2nd connection part which can connect a conductive connection member between each other, and a control end And a third connection portion and a fourth connection portion that can be connected to each other by conduction of the first switch that is alternatively mounted on the connection member, and a control end of the first switch. A fifth connection portion; a terminal connected to the second connection portion and the fourth connection portion and connectable to the outside; and a second switch that changes a potential of the first connection portion and the fifth connection portion. Prepare.

  A second aspect of the printed circuit board according to the present invention is the printed circuit board according to the first aspect, wherein the first connection portion and the second connection portion are connected to the second connection portion as the connection member. A diode having a forward direction toward the first connection is connected.

  A third aspect of the printed circuit board according to the present invention is the printed circuit board according to the first or second aspect, wherein the first switch is a relay having a coil and a switch structure, and the printed circuit board is The 2nd diode connected in series with respect to the said coil and the said 2nd switch is provided with the 6th connection part and 7th connection part which can be connected.

  According to the first aspect of the printed circuit board of the present invention, when the first switch is provided on the printed circuit board, the second switch can control the first switch on the printed circuit board. When the switch instead of the first switch is provided outside the printed circuit board, the connection member is mounted on the printed circuit board, and the control terminal of the external switch is connected to the output terminal. Can be controlled.

  Therefore, this printed circuit board can be employed regardless of whether the first switch is provided on the printed circuit board or an external switch. Therefore, the product number of the printed circuit board can be reduced.

  According to the second aspect of the printed circuit board of the present invention, when the relay is employed as the first switch of the external load, the relay when the high potential end and the low potential end of the DC power supply are connected in reverse. Current flowing in the coil can be blocked.

  According to the third aspect of the printed circuit board of the present invention, when the relay and the second diode are mounted, the coil of the relay when the high-potential end and the low-potential end of the DC power supply are connected in reverse is connected. The flowing current can be blocked.

It is a top view which shows roughly an example of a structure of the printed circuit board concerning 1st Embodiment. It is a top view which shows roughly an example of a structure of the printed circuit board concerning 1st Embodiment. It is a top view which shows roughly an example of a structure of the printed circuit board concerning 2nd Embodiment.

First embodiment.
FIG. 1 is a diagram schematically showing an example of a printed circuit board according to the present embodiment. The printed circuit board 10 includes connection portions 1a and 1b, connection portions 2a to 2e, a terminal 4 that can be connected to the outside, and a switch 5. The printed circuit board 10 also has an insulating substrate (not shown), and the above-described components are formed on the substrate. Wiring is also formed on the insulating substrate. This wiring is made of, for example, metal, and is appropriately connected to the above components.

  The connection parts 1a and 1b are connection parts for mounting a conductive connection member 1 (described later) on the printed circuit board 10. The connecting member 1 is, for example, a jumper wire, a resistor, or a diode. The connecting portions 1a and 1b can be connected to both ends of the connecting member 1 by, for example, solder. Such connecting portions 1a and 1b are also called lands or pads. However, the connection member 1 is not mounted in the illustration of FIG.

  The connecting portion 1b is connected to the terminal 4 through a wiring, and the connecting portion 1a is connected to one end of the switch 5 through the wiring.

  The connection parts 2 a to 2 e are connection parts for mounting the switch (for example, relay) 2 on the printed circuit board 10. The relay 2 is provided as an alternative to the connection member 1. In FIG. 1, the printed circuit board 10 provided with the relay 2 without the connection member 1 is illustrated.

  The relay 2 includes, for example, a coil 21 and a switch structure 22. The connecting portions 2a and 2c can be connected to both ends of the coil 21, respectively. The switch structure 22 has, for example, a first terminal to a third terminal, and the connecting portions 2b, 2d, and 2e can be connected to the first terminal to the third terminal, respectively. The connection portions 2a to 2e can be connected to the relay 2 by, for example, solder, and such connection portions 2a to 2e are also called lands or pads.

  The first terminal (terminal connected to the connecting portion 2b) is connected to the second terminal (terminal connected to the connecting portion 2d) and the third terminal (connecting portion 2e) depending on whether or not a current flows through the coil 21. Alternatively connected to one of the terminals. For example, the relay 2 has a deformation plate (not shown) that is electrically connected to the first terminal. This deformation plate is initially in contact with the third terminal. Therefore, the relay 2 initially connects the first terminal and the third terminal. And when an electric current flows into the coil 21, a deformation | transformation board will receive the magnetic attraction force from the coil 21, will bend, and will contact a 2nd terminal. As a result, the relay 2 connects the first terminal and the second terminal to each other.

  The connecting portion 2a is connected to one end of the switch 5 through a wiring. The connecting portion 2c is connected to the high potential end of the DC power supply E1 through, for example, a diode D3. In the example of FIG. 1, connection portions 3a and 3b that can be connected to the anode and the cathode of the diode D3 are provided on the printed circuit board 10, respectively, and the connection portion 3b and the connection portion 2c are connected to each other via wiring. The connecting portion 3a and the high potential end of the DC power supply E1 are connected to each other through a wiring. The forward direction of the diode D3 is a direction from the high potential end of the DC power supply E1 toward the connection portion 2a.

  The other end of the switch 5 is connected to the low potential end of the DC power supply E1. In the illustration of FIG. 1, the low potential end of the DC power supply E1 is grounded.

  In such a configuration, the diode D3, the coil 21, and the switch 5 are connected in series between the high potential end and the low potential end of the DC power supply E1. Therefore, when the switch 5 is turned on, a current flows through the coil 21, and when the switch 5 is turned off, the current to the coil 21 is interrupted.

  It can be understood that the switch 5 is a switch that changes the voltage of the connection portion 2a. The relay 2 is controlled by the current flowing through the coil 21. Therefore, the end connected to the connection portion 2a among the both ends of the coil 21 can be grasped as a control end for controlling the opening and closing of the relay 2 by the change in the potential. That is, the connection part 2a can be grasped as a connection part to which a control end for controlling the relay 2 is connected.

  The switch 5 is, for example, a semiconductor switch (for example, a MOS (Metal Oxide Semiconductor) field effect transistor), and is mounted on the printed circuit board 10. The switch 5 is controlled by the control unit 6.

  When a MOS field effect transistor is employed for the switch 5, a reverse conducting diode is parasitic. If an operator mistakenly connects the high potential end and the low potential end of the DC power supply E1 to the printed circuit board 10, current may flow through the coil 21 regardless of the operation of the switch 5. . Further, reverse conduction of the switch 5 is not desirable. Therefore, a diode D3 is provided to prevent such current.

  The control unit 6 is a microcomputer, for example, and is mounted on the printed board 10. A resistor R1 is connected between the output of the controller 6 and the control terminal (gate terminal) of the switch 5. A resistor R2 is connected between a point between the resistor R1 and the control terminal of the switch 5 and the other end (here, ground) of the switch 5. Resistors R1 and R2 are also mounted on the printed circuit board 10. When the control unit 6 gives a switch signal to the control terminal of the switch 5, the on / off of the switch 5 is controlled.

  The connecting portion 2d is connected to the high potential end of the DC power supply E2 through a wiring. Therefore, the high power supply potential of the DC power supply E2 is applied to the connection part 2d. The connection part 2e is connected to the low potential end of the DC power supply E2 via a wiring. In the illustration of FIG. 1, the low potential end of the DC power supply E2 is grounded. Therefore, the low power supply potential (for example, ground potential) of the DC power supply E2 is applied to the connection portion 2e. The connection part 2b is connected to the terminal 4 via a wiring.

  An external load 20 is connected to the terminal 4. In the illustration of FIG. 1, the external load 20 is, for example, a motor M1. One end of the motor M1 is connected to the terminal 4, and the other end is connected to the low potential end of the DC power supply E2. Here, the other end of the motor M1 is grounded.

  In such a configuration, when the relay 2 connects the connecting portion 2b to the connecting portion 2d, the DC power source E2 is connected to the motor M1, and when the relay 2 connects the connecting portion 2b to the connecting portion 2e, the DC power source E2 is Disconnected from the motor M1.

  The motor M1 rotates in response to the DC voltage of the DC power supply E2. The motor M1 is, for example, a door lock motor mounted on an automobile.

  As described above, according to the printed circuit board 10, by providing the relay 2 and the diode D3, connection / cutoff of the DC power source E2 to the motor M1 can be controlled according to the operation of the switch 5.

  Although the diode D3 prevents a current when the DC power supply E1 is erroneously connected, the diode D3 is not provided when the DC power supply E1 is not erroneously connected or when the switch 5 is not reversely connected. It doesn't matter. In this case, the connecting portions 3a and 3b are not provided, and the connecting portion 2c is connected to the DC power source E1 through the wiring.

  FIG. 2 is a diagram schematically showing an example of the printed circuit board 10 according to the present embodiment. In the illustration of FIG. 2, the relay 2 and the diode D3 are not mounted, but the connection member 1 is mounted. That is, the relay 2 or the relay 2 and the diode D3 are provided alternatively to the connection member 1. In the illustration of FIG. 2, the connecting member 1 is a diode D1, and its forward direction is a direction from the connecting portion 1b to the connecting portion 1a. That is, the anode of the diode D1 is connected to the connection part 1b, and the cathode is connected to the connection part 1a.

  In the illustration of FIG. 2, the external load 20 connected to the terminal 4 includes not only the motor M1 but also a switch (for example, a relay) 20a. The relay 20a is connected in series with the motor M1 between the high potential end and the low potential end of the DC power supply E2. Therefore, when the relay 20a is turned on, the DC power supply E2 is connected to the motor M1, and when the relay 20a is turned off, the DC power supply E2 is disconnected from the motor M1.

  For example, the relay 20a has a coil 21a and a switch structure 22a. One end of the coil 21a is connected to the terminal 4, and the other end is connected to the high potential end of the DC power supply E2.

  In the printed circuit board 10, the other end (ground) of the switch 5 is also connected to the low potential end of the DC power supply E2. Since the diode D1 is provided, the coil 21a, the diode D1, and the switch 5 are connected in series between the high potential end and the low potential end of the DC power supply E2. Therefore, when the switch 5 is turned on, a current flows through the coil 21a, and when the switch 5 is turned off, the current of the coil 21a is cut off. It can be understood that the switch 5 is a switch that changes the potential of the connecting portion 1a.

  The switch structure 22a has one end and the other end. One end of the switch structure 22a is connected to the high potential end of the DC power supply E2, and the other end is connected to the motor M1. The on / off of the switch structure 22a is controlled by whether or not a current flows through the coil 21a. For example, when a current flows through the coil 21a, one end and the other end of the switch structure 22 are electrically connected to each other. The end of the motor M1 opposite to the relay 20a is connected to the low potential end of the DC power supply E2, and is grounded here.

  Therefore, when the switch 5 is turned on, a current flows through the coil 21a and the switch structure 22a is turned on, whereby the DC power source E2 is connected to the motor M1. When the switch 5 is turned off, the current to the coil 21a is cut off and the relay 20a is turned off, whereby the DC power source E2 is disconnected from the motor M1. That is, according to the operation of the switch 5, connection / cutoff of the DC power supply E2 to the motor M1 can be controlled.

  As described above, when the external load 20 is not provided with the relay 20a, by providing the relay 2 (and also the diode D3) without providing the connecting member 1 on the printed circuit board 10 (see FIG. 1), The connection / cutoff of the DC power supply E1 to the motor M1 can be selected appropriately. Further, when the external load 20 is provided with the relay 20a, the connection member 1 is provided on the printed circuit board 10 without providing the relay 2 (or further the diode D3) (see FIG. 2), so that the motor M1 is appropriately provided. Can be connected / blocked.

  Therefore, the printed circuit board 10 can be used for any of the types of external loads 20 (whether or not the relay 20a is provided). The printed circuit board 10 here is a printed circuit board in a state where the connection member 1 and the relay 2 (or the diode D3) are not provided.

  Since the printed circuit board 10 can be used for any of the two types of external loads 20, the product number of the printed circuit board can be reduced.

  The diode D1 is provided so that current does not flow through the coil 21 when an operator mistakenly turns the DC power supply E2 in the reverse direction. When this diode D1 is provided in the external load 20, or when the DC power supply E2 cannot be erroneously connected, it is not necessary to employ the diode D1 as the connection member 1. In this case, a jumper wire or a resistance element may be employed as the connection member 1.

  On the other hand, if the diode D1 is used as the connection member 1, it is not necessary to provide the diode D1 in the external load 20 even if the DC power supply E2 may be erroneously connected.

Second embodiment.
In the first embodiment, a relay is employed as the switch 2, but the present invention is not necessarily limited thereto. For example, as shown in FIG. 3, a semiconductor switch S2 may be employed as the switch 2. In FIG. 3, since the switch 2 is provided on the printed circuit board 10, the connecting member 1 is not provided, and the external load 20 is not provided with the switch 20 a.

  One end of the semiconductor switch S2 is connected to the connection portion 2d, and the other end is connected to the connection portion 2b. The control terminal of the semiconductor switch S2 is connected to the connection portion 2a. Thus, the semiconductor switch S2 and the motor M1 are connected in series between the high potential end and the low potential end of the DC power supply E2. Therefore, when the semiconductor switch S2 is turned on, the DC power source E2 is connected to the motor M1, and when the semiconductor switch S2 is turned off, the DC power source E2 is disconnected from the motor M1.

  In the illustration of FIG. 3, the semiconductor switch S2 is a p-channel MOS field effect transistor. In the illustration of FIG. 3, resistors R3 and R4 are provided on the printed circuit board 10 to drive the semiconductor switch S2. The resistor R3 is connected between the high potential end of the DC power supply E1 and the switch 5. The resistor R4 is connected between a point between the resistor R3 and the switch 5 and the connection portion 2a (control terminal of the semiconductor switch S2).

  The connecting portion 1a is connected to a point where the resistors R3 and R4 and the switch 5 are connected.

  With the configuration of FIG. 3, the DC power source E2 can be connected / cut off to the external load 20 that does not have the switch 20a.

  When the external load 20 having the switch 20a is used, the connecting member 1 may be mounted without mounting the semiconductor switch S2 on the printed board 10. As a result, the DC power source E2 can be connected to or disconnected from the external load 20 having the switch 20a.

  When the semiconductor switch S2 is not mounted, the resistors R3 and R4 may not be mounted.

  As described above, the present invention has been described in detail. However, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Connection member 2,5 Switch 4 Output end 10 Printed circuit board 1a, 1b, 2a-2e Connection part

Claims (3)

A printed circuit board,
A first connection portion and a second connection portion to which a conductive connection member can be connected;
A third connection part and a fourth connection part, the opening and closing of which are controlled by the potential of the control terminal, and the first switch that is alternatively mounted on the connection member can be connected to each other, and
A fifth connection for connecting the control end of the first switch;
A terminal connected to the second connection part and the fourth connection part and connectable to the outside;
A printed circuit board comprising: a second switch that changes a potential of the first connection portion and the fifth connection portion. The printed circuit board according to claim 1,
The first connection part and the second connection part are printed circuit boards in which a diode having a forward direction from the second connection part toward the first connection part is connected as the connection member. The printed circuit board according to claim 1 or 2,
The first switch is a relay having a coil and a switch structure;
The printed circuit board is
A printed circuit board, wherein a second diode connected in series to the coil and the second switch includes a connectable sixth connection portion and a seventh connection portion.

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