JP2008066088A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay capable of suppressing heat generation by reducing power consumption of a coil in driving the electromagnetic relay. <P>SOLUTION: The electromagnetic relay includes an external connection terminal group including a common terminal 13 having two coil terminals 14a, 14b connected to both ends of the coil, a make terminal 15, and a brake terminal 16, and a cover 11. The external connection terminal group and the cover are fixed on a base 12. The external connection terminal group includes a coil drive terminal 17 with a resistance 19 and a capacitor 20 connected in parallel between the coil drive terminal 17 and the coil terminal 14b. The electromagnetic relay includes an element installation part 31 provided on a part of the coil drive terminal 17, and a member 18 for connection connected to the coil terminal 14a and fixed on the base 12. The resistance 19 and the capacitor 20 are arranged on the element installation part 31 and the member 18 for connection. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic relay, and more particularly to a board-mounted electromagnetic relay that is effective as an on-vehicle electrical component.

  Electromagnetic relays are widely used in fields such as communication equipment, automobile electrical components and household electrical products. Generally, as shown in Patent Document 1 and the like, an electromagnet composed of a coil, a core, and a yoke, an armature attracted by the electromagnet, a hinge spring that applies a restoring force to the armature, and a tip portion thereof A movable contact connected to the movable contact, a fixed contact disposed at a position opposite to the movable contact, and the external connection terminal group respectively conducted to the coil and the movable contact and the fixed contact. The electromagnet, the fixed contact, and the external connection terminal group are The cover is fixed to the base with a sealant.

  5A and 5B are external perspective views of an example of a conventional electromagnetic relay as viewed from the external connection terminal side. FIG. 5A shows a state before injection of the sealant and FIG. 5B shows a state after injection of the sealant. In FIG. 5, the external connection terminal group includes two coil terminals 14a and 14b connected to both ends of an electromagnet coil, a common terminal 13 connected to a movable contact, and a make terminal 15 connected to two fixed contacts. And a break terminal 16.

  FIG. 6 is a circuit configuration diagram showing a driving method of a conventional electromagnetic relay, and the driving of the conventional electromagnetic relay is performed with a circuit configuration as shown in FIG. That is, when the switch 3 connected between the DC power source 1 and the electromagnetic relay 32 is closed, the amateur is attracted by the electromagnet by applying a voltage from the DC power source 1 to the coil 2a of the electromagnetic relay 32, When the attached movable contact moves and contacts the fixed contact, the contact portion 2b of the electromagnetic relay 32 is closed.

JP 2000-182500 A

  Normally, a normally-off electromagnetic relay is used for in-vehicle use. In this type of electromagnetic relay, as shown in FIG. 6, when no voltage is applied to the coil 2a, the load circuit side connected between the common terminal 13 and the make terminal 15 is open, and the load circuit side is closed. In order to achieve a completed state, a voltage is applied to the coil 2a to bring it into an energized state.

  In-vehicle loads include loads that are assumed to be used continuously such as lamps and heaters. Accordingly, the electromagnetic relay used for controlling the load is kept in the closed coil energization state. Under such continuous driving conditions, the temperature of the electromagnetic relay rises due to Joule heat generated in the coil 2a. Since in-vehicle electromagnetic relays are often driven at high temperatures, problems such as coil disconnection and short-circuiting occur as the temperature of the electromagnetic relay main body rises. In addition, since components such as electromagnetic relays are densely mounted in a narrow space, they have a thermal effect on other peripheral components and the substrate, and may cause problems such as circuits in some cases.

  Therefore, the subject of this invention is providing the electromagnetic relay which can suppress heat_generation | fever by reducing the power consumption of the coil at the time of an electromagnetic relay drive.

  In order to solve the above problems, an electromagnetic relay according to the present invention includes an external connection terminal group including two coil terminals connected to both ends of a coil and an electromagnetic relay in which a cover is fixed to a base. Includes a coil drive terminal in which a resistor and a capacitor are connected in parallel between one of the two coil terminals.

  In addition, an element installation portion provided in a part of the coil drive terminal, and a connecting member connected to one of the coil terminals and fixed to the base, the resistor and the capacitor are the element installation portion And may be disposed on the connecting member.

  The coil driving terminal and the connection member are integrally formed by a connecting portion, and the connecting portion is formed by cutting the connecting portion after the integrally formed coil driving terminal and the connecting member are installed on the base. May be.

  When the electromagnetic relay is in an off state, an amateur made of an internal movable iron piece is in an open state. When driving the electromagnetic relay, it is necessary to attract the armature in the open state with the magnetic force generated by the coil and close the magnetic circuit. Therefore, relatively large energy is required when driving the electromagnetic relay. On the other hand, once the magnetic circuit is closed, the state can be maintained with less energy than in the initial driving.

  In the conventional driving method, as shown in FIG. 6, the voltage supplied to the coil is the same during initial driving and during state maintenance. However, as described above, the power supply voltage in maintaining the state after the magnetic circuit is once closed can be set lower than the power supply voltage at the time of initial driving. Since the amount of heat generated in the coil is proportional to the square of the power supply voltage to the coil, it is possible to greatly reduce the heat generation of the coil by suppressing the power supply voltage when maintaining the state. In the present invention, this is realized by driving a coil through a parallel circuit of a resistor and a capacitor.

  As described above, the electromagnetic relay according to the present invention has a coil drive terminal in which a resistor and a capacitor are connected in parallel between one of the coil terminals of the electromagnetic relay, thereby providing a predetermined power supply voltage to the coil during initial driving. In maintaining the state, the power supply voltage can be suppressed to reduce the heat generation of the coil, and an electromagnetic relay capable of suppressing heat generation can be obtained by reducing the power consumption of the coil when the electromagnetic relay is driven.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of an external appearance of an electromagnetic relay as an embodiment of the present invention viewed from the external connection terminal side. FIG. 2 is a view showing an assembled state of the electromagnetic relay, and is an external perspective view as seen from the external connection terminal side similar to FIG. 1, and FIG. ) Shows after sealing agent injection. 3A and 3B are diagrams showing the connection of the coil drive terminal and the connecting member used in the present embodiment, the resistor, and the capacitor. FIG. 3A is a perspective view seen from above, and FIG. 3B is a side view. FIG.

  As shown in FIG. 1, the electromagnetic relay 2 according to the present embodiment includes two coil terminals 14a and 14b connected to both ends of a coil, and includes an external connection terminal group having a common terminal 13, a make terminal 15, and a break terminal 16. In the electromagnetic relay in which the cover 11 is fixed to the base 12, the external connection terminal group includes a coil drive terminal 17 in which a resistor 19 and a capacitor 20 are connected in parallel between the coil terminal 14b.

  Further, it has an element installation portion 31 provided in a part of the coil drive terminal 17 and a connecting member 18 connected to the coil terminal 14b and fixed to the base 12, and the resistor 19 and the capacitor 20 are the element installation portion 31. And disposed on the connecting member 18. The base 12 is provided with fitting holes 21a, 21b, 21c, 22a, and 22b for fixing the coil drive terminal 17 and the connecting member 18.

  In the assembly of the electromagnetic relay according to the present embodiment, as shown in FIG. 3A, the coil drive terminal 17 and the connecting member 18 are integrally formed by the same member by the connecting portion 24 in the initial stage. Treated as a terminal member 25. A resistor 19 and a capacitor 20 are arranged on the terminal member 25 as shown in FIG. 3A, and electrodes at both ends thereof are connected to the coil drive terminal 17 and the connecting member 18. As shown in FIG. 3B, the terminal member 25 has fitting protrusions 26a, 26b, 26c, 27a, and 27b, and a locking claw 28 is provided on the side surface of each of the fitting protrusions. The locking claw 28 bites into the inner surfaces of the fitting holes 21a, 21b, 21c, 22a, and 22b of the base 12, whereby the terminal member 25 and the base 12 are locked. After the terminal member 25 is installed and fixed, the connecting member 18 and the coil terminal 14b are electrically connected by welding, soldering, or the like. Thereafter, the connecting portion 24 of the terminal member 25 is cut and separated into the coil driving terminal 17 and the connecting member 18. Thereafter, as shown in FIG. 2B, the sealing agent 29 is injected and cured on the back surface of the base 12 from which the external connection terminal group protrudes.

  Next, the operation of the electromagnetic relay according to the present embodiment will be described.

  FIG. 4 shows a drive circuit configuration of the electromagnetic relay according to the present embodiment. The resistor 4 included in the electromagnetic relay 2 of the present embodiment has an effect of reducing the voltage applied to the coil 2a when the driving state is maintained. That is, if the voltage of the DC power source 1 is V, the internal resistance of the coil 2a is r, and the resistance value of the resistor 4 is R, the applied voltage to the coil 2a in the steady state is V · r / (r + R). . Therefore, the resistor 4 is set so as to obtain a coil applied voltage required for maintaining the target coil drive.

  The capacitor 5 connected in parallel to the resistor 4 has an effect of applying the voltage of the DC power source 1 to the coil 2a as it is during the initial drive, and then reducing the voltage applied to the coil 2a in the charging process. When the capacitor 5 starts to be charged as the switch 3 is closed, the voltage applied to the coil 2a is the difference between the input voltage of the DC power source 1 and the charging voltage of the capacitor 5. Therefore, as the capacitor 5 is charged, the voltage applied to the coil 2a decreases and converges to the steady state voltage. As described above, since it is necessary to apply a predetermined voltage for a predetermined time when the electromagnetic relay 2 is initially driven, the capacitance of the capacitor 5 is set to an appropriate value from the time required for the initial driving. The charge charged in the capacitor 5 is discharged by the resistor 4 connected in parallel after the switch 3 is opened, and the discharge is completed by the next driving.

  For example, in an electromagnetic relay with a rated voltage of 12 V and a coil resistance of 160Ω, if the initial drive time is 3 ms and the applied voltage in a steady state is 7 to 9 V, the capacitance of the capacitor is about 100 μF to 200 μF, and the resistance is 50 to 110Ω. A degree of resistance can be selected.

  As described above, the electromagnetic relay of the present invention includes a resistor and a capacitor in the electromagnetic relay, thereby reducing the temperature increase of the electromagnetic relay when the coil is energized and driving the instability associated with the temperature increase of the electromagnetic relay. Effects such as removal and reduction of thermal influence on the surroundings can be obtained. In addition, because it has a coil drive terminal with a built-in capacitor and resistor, customers who use electromagnetic relays do not need a special drive circuit to achieve the same heat generation suppression function by reducing power consumption. There is.

  Needless to say, the present invention is not limited to the above-described embodiments, and the present invention can be applied to all types of electromagnetic relays using coil-driven electromagnets. In addition, the shape of the coil driving terminal, the element installation portion, the connecting member, the fixing method to the base, the fixing position, the arrangement, and the like can be changed according to the purpose. The form of the capacitor and the resistor, the installation method, the capacitance of the capacitor, the resistance value of the resistor, etc. can be designed according to the purpose.

The disassembled perspective view of the external appearance seen from the external connection terminal side of the electromagnetic relay which is one embodiment of this invention. The external appearance perspective view seen from the external connection terminal side which shows the assembly state of the electromagnetic relay of this Embodiment, FIG. 2 (a) is before sealing agent injection | pouring, FIG.2 (b) is a figure which shows after sealing agent injection | pouring. It is a figure which shows the coil drive terminal used for this Embodiment and the member for connection, and joining of a resistor and a capacitor | condenser, FIG. 3 (a) is the perspective view seen from upper direction, FIG.3 (b) is the perspective view seen from the side. . The figure which shows the drive circuit structure of the electromagnetic relay of this Embodiment. The external appearance perspective view seen from the external connection terminal side which shows an example of the conventional electromagnetic relay, FIG. 5 (a) is a figure which shows sealing agent injection | pouring before injection | pouring and FIG.5 (b). The circuit block diagram which shows the drive method of the conventional electromagnetic relay.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 DC power source 2, 32 Electromagnetic relay 2a Coil 2b Contact part 3 Switch 4, 19 Resistance 5, 20 Capacitor 11 Cover 12 Base 13 Common terminal 14a, 14b Coil terminal 15 Make terminal 16 Break terminal 17 Coil drive terminal 18 Connection member 21a , 21b, 21c, 22a, 22b Fitting hole 24 Connecting portion 25 Terminal member 26a, 26b, 26c, 27a, 27b Fitting protrusion 28 Locking claw 29 Sealant 31 Element installation portion

Claims (3)

  In an electromagnetic relay in which a cover is fixed to a base and an external connection terminal group including two coil terminals connected to both ends of the coil, the external connection terminal group includes a resistor and a capacitor between one of the two coil terminals. An electromagnetic relay, comprising: coil drive terminals connected in parallel.   An element installation portion provided in a part of the coil drive terminal; and a connection member connected to one of the coil terminals and fixed to the base, both of the resistor and the capacitor being the element installation portion. The electromagnetic relay according to claim 1, wherein the electromagnetic relay is disposed on the connection member.   The coil driving terminal and the connecting member are integrally formed by a connecting portion, and the connecting portion is cut after the integrally formed coil driving terminal and the connecting member are installed on the base. The electromagnetic relay according to claim 2.

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