JP2003047290A - Control circuit structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize a control circuit. SOLUTION: A control circuit structure 10, which is equipped with a controller 14 having the first output part 14a and the second output part 14b for controlling the drive of the first fan 12 and the second fan 13, is provided with the first relay 15, the second relay 16, and a semiconductor device 11, and it applies a current to the second relay 16 with the current application of the first output part 14a of the controller 14, and puts the first fan 12 and the second fan 13 in series state and drives them at low revolution. Furthermore, the controller 14 closes the contact of the first relay 15 and also closes the control contact of the semiconductor device 11, by the current application of the first output part 14a and the second output part 14b, whereby it makes the first fan 12 and the second fan 13 each independent, thereby putting them in such state that all voltage is applied, and performs the drive at high revolution.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit structure, and more particularly, to reducing the number of relays and reducing the size and weight of a circuit by introducing a semiconductor device. It is. 2. Description of the Related Art Various loads such as a headlight and a radiator fan are mounted on an automobile, and a relay and an external circuit are formed in an internal circuit of an electric connection box to control the driving of these loads. A control circuit for driving the load is configured by connecting a wire harness and the like. FIG. 3 shows a conventional control circuit structure 1, which controls the driving of a first fan 2 and a second fan 3 as loads. The control circuit structure 1 has a controller 4 for controlling the driving state of the first fan 2 and the second fan 3 in three stages of low rotation, high rotation, and a first output unit 4a of the controller 4. The two output unit 4b is connected to the first relay 5, the second relay 6, and the third relay 7. Specifically, the first output section 4a is connected to the coil section 6a of the one-contact type second relay 6, and the second output section 4b
And one end 4c is connected to the coil portion 5a of the one-contact type first relay 5, and the other end 4d is connected to the coil portion 7a of the third relay 7 having a normally closed contact 7b and a normally closed contact 7c. Connected to Also,
The upstream connecting portion 2a of the first fan 2 branches, and connects one end 2c to the downstream contact 5b of the first relay 5 and connects the other end 2d to the normally closed contact 7 of the third relay 7.
b, and the downstream connection part 2b is grounded. The upstream connection 3a of the second fan 3 is connected to the downstream contact 6b of the second relay 6, and the downstream connection 3b is connected to the common contact 7d of the third relay 7. The other of the coil portions 5a, 6a, 7a of the first relay 5, the second relay 6, and the third relay 7 is configured so that the circuit is closed via the fuse F1. Contact 5c and the upstream contact 6 of the second relay 6
c is connected to a power supply via fuses F2 and F3. The normally open contact 7c of the third relay 7 is grounded. As shown in FIG. 4, the first fan 2 and the second fan 3 are not driven if both the first output unit 4a and the second output unit 4b of the controller 4 are OFF. Next, when a certain condition for driving the fan is satisfied, only the first output portion 4a of the controller 4 is turned on, and thereby the upstream contact 6c and the downstream contact 6b are excited by the excitation of the coil 6a of the second relay 6.
Are closed to conduct electricity from the second fan 3 to the first fan 2 via the common contact 7d of the third relay 7 and the normally closed contact 7b. That is, the second fan 3 and the first fan 2 are in series and are driven at a low rotation. Further, when the condition for increasing the driving of the fan is satisfied, the controller 4 turns on the second output section 4b in addition to the first output section 4a. As a result, the first relay 5 conducts by closing the upstream contact 5c and the downstream contact 5b, and the third relay 7 conducts by closing the common contact 7d and the normally open contact 7c. Are driven independently at high speed with full voltage applied. There are many other circuits for controlling the driving of two loads, such as fans, in addition to those described above. For example, in the case where each load has a low-drive connection and a high-drive connection, A circuit using a total of six one-coil one-contact relays, or a total of three one-coil two-contact relays.
In some cases, a circuit is configured by using a plurality of such circuits. In recent years, there has been a strong demand for a lighter vehicle body in order to improve the fuel efficiency of automobiles, and various electrical components mounted on the vehicle body have also been required to be lighter. I have. In addition, there is an increasing demand for miniaturization of electrical components and the like in order to improve the layout and the like for attachment to a vehicle body. In the control circuit structure 1 shown in FIG. 3, since the first, second and third relays 5, 6, and 7 are used, a total of three relays are used. Has a certain volume, so there is a problem that a certain limit is imposed on miniaturization. In order to solve such a problem, it is conceivable to replace each relay with a semiconductor device having a small and lightweight relay function. That is, the weight of a general relay is about 40 to 4
The semiconductor device weighs about 20 to 3 while weighing 5 g.
0 g, and since the volume of the semiconductor device is about one third of the relay, by applying the semiconductor device,
It is possible to reduce the size and weight of a conventional relay. However, in the control circuit structure 1, each relay 5,
Assuming that 6 and 7 are directly replaced with semiconductor devices,
In the circuit, control is performed on the upstream side of the first fan 2 and the second fan 3, and in such upstream side control, the contact point is set to O.
There is a problem that the resistance when N is set is larger than that when the control is performed on the downstream side. When the resistance increases, the amount of heat increases, heat dissipation means are required, and in upstream control, peripheral circuits such as charge pumps are generally complicated. In comparison, no remarkable weight reduction or downsizing has been achieved. Further, even if such a relay is replaced with a semiconductor device as it is, a significant reduction in weight and size cannot be expected even in other conventional control circuit structures other than the control circuit structure 1. . The present invention has been made in view of the above-mentioned problems, and has as its object to reduce the size and weight of the entire circuit even when a semiconductor device is used for a drive control circuit of a load. In order to solve the above-mentioned problems, the present invention provides a first load and a second load, and a first output unit for controlling the driving of the first load and the second load. In a control circuit structure including a controller provided with a second output unit, a first relay having a normally open contact, a normally closed contact and a common contact, a one-contact type second relay, and a semiconductor device having a control contact And the controller connects the first output section to the coil section of the second relay, and connects the second output section to the coil section of the first relay and the semiconductor device. The control contact is connected to one branching downstream of the second load connected to the downstream contact of the second relay, and the other branching downstream of the second load is the other of the first relay. Normal Mark Connect to the Rose contact, connect the first load to the common contact of the first relay and ground the downstream side,
By energizing only the first output portion of the controller, the first load and the second load in series are driven, while energizing the first output portion and the second output portion, the first relay is normally open. The present invention provides a control circuit structure characterized in that the contact is closed and the control contact of the semiconductor device is also closed to drive the first load and the second load independently. When the small and light semiconductor device is connected to the downstream side of the load as described above, first, the semiconductor device itself is small and light, so that the circuit structure is smaller than when all contacts are opened and closed in a circuit by a relay. Can be reduced in weight. Further, since the semiconductor device is connected downstream of the first load, the ON resistance of the contact is low and there is no problem such as heat generation. Further, the downstream side is less affected by peripheral circuits and the circuit is not complicated. Judging from the whole circuit, the size and weight can be reduced as compared with the conventional control circuit structure, and as a result, the fuel efficiency of the vehicle body can be improved. The drive control of the first load and the second load is performed by energizing and de-energizing the first output part and the second output part of the controller in the same manner as in the prior art. Since the settings and settings need not be changed, the control circuit structure of the present invention can be smoothly introduced. The loads include motors for driving various lights, fans, and the like, and the present invention can be applied to a circuit structure for driving and controlling these loads. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a control circuit structure 10 according to an embodiment of the present invention, which controls the driving of a first fan 12 and a second fan 13 as loads. The control circuit structure 10 includes a controller 14 that stops the driving states of the first fan 12 and the second fan 13 and controls the driving state in three stages of low rotation and high rotation.
And the first output section 14a of the controller 14 is connected to the second relay 1
6, the second output section 14b is connected to the first relay 15 and the semiconductor device 11. The first relay 15 includes a normally closed contact 15b, a normally open contact 15c, and a common contact 15
The normally closed contact 15b and the common contact 15d are closed when the coil portion 15a is not energized, and the normally open contact 15c and the common contact 15d are closed by energizing the coil portion 15a. Second relay 1
Reference numeral 6 denotes a single-contact type in which the upstream contact 16c and the downstream contact 16b are closed by energization of the coil portion 16a and opened by non-energization. The semiconductor device 11 performs a relay function by using a semiconductor. The semiconductor device 11 has an upstream contact 11b and a downstream contact 11 as control contacts, and also has an energizing contact 11a corresponding to a coil portion of the relay. In this embodiment, when electricity is supplied to the energizing contact 11a, the upstream contact 11
b and the downstream contact 11c are closed, and when no power is supplied, the upstream contact 11b and the downstream contact 11c are opened. The semiconductor device 11 is smaller and lighter than a normal relay, and more specifically, the mass is about one-half to three-quarters of the relay,
The volume is about one third. A specific connection form of the control circuit structure 10 is as follows.
The first output portion 14a of the controller 14 is connected to the coil portion 16a of the second relay 16, the second output portion 14b is branched, and one end 14c is connected to the coil portion 15a of the first relay 15, The other end 14d is connected to a current-carrying contact 11a of the semiconductor device 11. In addition, the first fan 12
Is connected to the common contact 15 of the first relay 15.
d, and the downstream connection portion 12b is grounded. Further, the second fan 13 is connected to the upstream connecting portion 1.
3a is connected to the downstream contact 16b of the second relay 16, and the downstream connecting portion 3b is branched to connect one end 13c to the upstream contact 11b of the semiconductor device 11,
The other end 13 d is connected to the normally closed contact 15 b of the first relay 15. The other of the coil portions 15a and 16a of the first relay 15 and the second relay 16 is configured so that the circuit is closed via a fuse F11.
The normally open contact 15c of No. 5 is connected to a power supply via a fuse F12, and the upstream contact 16c of the second relay 16 is connected to a power supply via a fuse F13. The downstream contact 11c of the semiconductor device 11 is grounded. In such a connection configuration, the semiconductor device 11 is connected to the downstream side of the second fan 13 to control the circuit (open and close contacts), while the second relay 16 is connected to the second fan 13. The first relay 15 controls the circuit upstream of the first fan 12. In addition, by applying the semiconductor device 11, the control circuit structure 10 is smaller and lighter than the control circuit structure 1 of FIG. 3 by the absence of one relay. First fan 12 in control circuit structure 10
The driving of the second fan 13 is controlled by the power supply status of the first output unit 14a and the second output unit 14b of the controller 14. Specifically, as shown in FIG. 2, if both the first output unit 14 a and the second output unit 14 b of the controller 14 are in the OFF state, the coil unit 15 a of the first relay 15 and the coil of the second relay 16 Since the portion 16a is not excited, the first fan 12 and the second fan 13 are stopped. Next, when a certain condition for driving the fan is satisfied, only the first output portion 14a of the controller 14 is turned ON, whereby the upstream contact 16c and the downstream contact 16b are excited by the excitation of the coil portion 16a of the second relay 16. Closes and conducts, from the second fan 13 to the normally closed contact 15 of the first relay 15
The circuit is conducted to the first fan 12 through the common contact 15b and the common contact 15d. That is, the second fan 13 and the first fan 1
2 are in series, and half of the total voltage is
3, the second fan 13 and the first fan 12 are driven at a low speed according to the voltage level. In the above state, the semiconductor device 11
Is not energized, so that the upstream contact 11b and the downstream contact 11
c remains open, and no power is supplied to the semiconductor device 11 from the first fan 13. When the condition for further increasing the drive of the fan is satisfied from the above state, the controller 14 sets the first output unit 14
The second output unit 14b is also turned on in addition to a. This allows
The first relay 15 is switched such that the normally open contact 15c and the common contact 15d are closed when the coil portion 15a is excited, and the first contact 15 of the semiconductor device 11 is closed.
a, the upstream contact 11b and the downstream contact 1
1c is closed and conducting. Under the above control, the first fan 12 is connected to the fuse F12 independently via the first relay 15, and the second fan 13 is also connected to the second relay 16 upstream from the fuse F13. , The downstream side is connected independently via the semiconductor device 11, and the first fan 12 and the second fan 13
Each of them is driven at a high speed with all voltages applied. As described above, the first fan 12 and the second fan 13 are energized by the controller 14 under the same conditions as in the prior art.
Are driven, so that the connection form with the periphery of the control circuit structure 10 can be handled without being changed. The mode in which the semiconductor device is applied to the control circuit can be applied to various control circuits other than the control circuit structure 10 in FIG. 1. The present invention is also applicable to a circuit having about twice as many relays as a load, a circuit having one coil and two contact coils, and the like. In addition to the fan, various lights such as a headlight and various motors can be applied to the load. As is clear from the above description, when the control circuit structure of the present invention is used, since the semiconductor device is used instead of the relay, the circuit can be reduced in size and weight, and the fuel efficiency of the automobile can be improved. In addition to contributing, it is possible to meet the demand for improved mountability to the vehicle body. Further, in the present invention, since the semiconductor device is connected to the downstream side of the load and performs control on the downstream side, no heat is generated at the time of control on the upstream side, and the circuit can be prevented from becoming complicated. As a result, the size and weight can be reduced as compared with the conventional circuit structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a control circuit structure according to an embodiment of the present invention. FIG. 2 is a time chart according to the control circuit of the embodiment. FIG. 3 is a circuit diagram of a conventional control circuit structure. FIG. 4 is a time chart according to a conventional control circuit. [Description of Signs] 10 Control circuit structure 11 Semiconductor device 12 First fan 13 Second fan 14 Controller 14a First output unit 14b Second output unit 15 First relay 16 Second relay

Claims (1)

Claims 1. A first load and a second load, and a controller provided with a first output section and a second output section for controlling the driving of the first load and the second load. In a control circuit structure, a first relay having a normally open contact, a normally closed contact and a common contact, and a one-contact type second relay,
A semiconductor device having a control contact, wherein the controller connects the first output section to the coil section of the second relay, and connects the second output section to the coil section of the first relay and the semiconductor device. On the other hand, the semiconductor device connects the control contact to one branching off on the downstream side of the second load connected to the contact on the downstream side of the second relay, and the other branching off on the downstream side of the second load. Connected to the normally closed contact of the first relay, connected the first load to the common contact of the first relay, and grounded downstream, energized only the first output of the controller, and connected in series. While driving the first load and the second load in the state, by energizing the first output unit and the second output unit, the normally open contact of the first relay is closed and the control contact of the semiconductor device is also closed, first A control circuit structure wherein a load and a second load are driven independently of each other.