control device

Abstract

This control device (1) comprises: two first power lines (34, 35) in which inductors (31, 32) are respectively disposed; two second power lines (36, 37); a control circuit (33) to which first power is supplied from a power supply circuit (20) via the two first power lines (34, 35); a first non-contact relay that has a first input terminal and a first output terminal, of which one is supplied with the first power from the power supply circuit (20) via the two first power supply lines (34, 35) and the other is supplied with second power from the power supply circuit (20) via the two second power lines (36, 37); and a second non-contact relay that has a second input terminal and a second output terminal, of which one is supplied with the second power from the power supply circuit (20) via the two second power lines (36, 37) and the other is supplied with third power and connected to an external configuration.

Description

[Technical Field]

[0001] The present disclosure relates to a control device including a contactless relay. [Background technology]

[0002] Conventionally, control devices used in trains and the like use non-contact relays such as photocouplers to isolate one circuit from the other. For example, Patent Document 1 discloses a technology in an external condition input circuit used in trains, in which the output from a semiconductor DC (Direct Current) / DC converter is output to a signal reading unit as an operation signal information digital signal via a photocoupler, which is a non-contact relay. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-075660 Summary of the Invention [Problem to be solved by the invention]

[0004] Due to parasitic capacitances present inside the photocoupler and in the wiring path, the primary and secondary sides of the photocoupler, i.e., the light-emitting diode side and the light-receiving element side, can be considered to be coupled. When using such a circuit, due to the parasitic capacitance present near the photocoupler, noise applied to the secondary side of the photocoupler flows through the primary side of the photocoupler and then returns to the vehicle body, or noise applied to the primary side of the photocoupler flows through the secondary side of the photocoupler and then returns to the vehicle body. Therefore, in a circuit configuration in which the control circuit is connected to a noise source via a photocoupler, there is a problem in that noise may flow through the control circuit via the photocoupler, causing the control circuit to malfunction.

[0005] The present disclosure has been made in view of the above, and aims to provide a control device that includes a non-contact relay and is capable of reducing the inflow of noise into a desired path via parasitic capacitance. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, a control device according to the present disclosure includes two first power supply lines, each of which has an inductor disposed thereon; No inductors are placed on each a control circuit to which a first power is supplied from a power supply circuit via two second power supply lines and two first power supply lines; a first non-contact relay having a first input terminal and a first output terminal, one terminal to which the first power is supplied from the power supply circuit via the two first power supply lines and the other terminal to which a second power is supplied from the power supply circuit via the two second power supply lines; and a second non-contact relay having a second input terminal and a second output terminal, one terminal to which the second power is supplied from the power supply circuit via the two second power supply lines and the other terminal to which a third power is supplied and to which an external configuration is connected. The external component is a load. The control circuit is capable of controlling conduction of a first power at a first input terminal of the first non-contact relay, conducting a second power to a first output terminal of the first non-contact relay by conducting the first power to the first input terminal of the first non-contact relay, conducting a second power to a second input terminal of the second non-contact relay by conducting the second power to the first output terminal of the first non-contact relay, conducting a third power to a second output terminal of the second non-contact relay by conducting the second power to the second input terminal of the second non-contact relay, and supplying the third power to the load by conducting the third power to the second output terminal of the second non-contact relay, thereby controlling the operation of the load. It is characterized by: [Effects of the Invention]

[0007] The control device of the present disclosure has an effect of being able to reduce the inflow of noise into a desired path via parasitic capacitance while including a non-contact relay. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a configuration example of a control device according to a first embodiment; [Figure 2] FIG. 1 is a diagram illustrating an image of parasitic capacitance present in the control device according to the first embodiment. [Figure 3] FIG. 1 is a diagram showing an image of a circuit when a load connected to the control device according to the first embodiment becomes a noise source of common mode noise. [Figure 4] FIG. 1 is a diagram showing an example of a path through which common mode noise flows in a control device according to a first embodiment; [Figure 5] FIG. 10 is a diagram showing a configuration example of a control device according to a second embodiment; [Figure 6] FIG. 10 is a diagram showing an image of parasitic capacitance present in the control device according to the second embodiment. [Figure 7] FIG. 10 is a diagram showing an image of a circuit when a switch connected to a control device according to a second embodiment becomes a noise source of common mode noise. [Figure 8] FIG. 10 is a diagram showing an example of a path through which common mode noise flows in a control device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a control device according to an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0010] Embodiment 1 FIG. 1 is a diagram showing an example of the configuration of a control device 1 according to the first embodiment. The control device 1 is a DO (Domain Control Unit) used in a train (not shown) or the like. i The control device 1 is a digital output (MOS) circuit. The control device 1 is connected to a vehicle power supply 2 and a load 3. The control device 1 controls the supply of power from the vehicle power supply 2 to the load 3 and controls the operation of the load 3 under the control of a control circuit 33. The control device 1 includes connections 10 and 11, a power supply circuit 20, a first power supply line 34 on which an inductor 31 is arranged, a second power supply line 35 on which an inductor 32 is arranged, a control circuit 33, second power supply lines 36 and 37, a transistor 41, a photocoupler 42, resistors 43 and 45, and a photo MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) relay (hereinafter referred to as a photo MOS relay) 44. The power supply circuit 20 includes Y capacitors 21, 22, 28, and 29, a switching element 23, a transformer 24, capacitors 25 and 27, and a diode 26. In the following description, the photocoupler 42 may be referred to as a first non-contact relay, and the photo MOS relay 44 may be referred to as a second non-contact relay.

[0011] The control device 1 is connected at one end to a positive pole P100 of the vehicle power supply 2 at a connection part 10 and at the other end to a negative pole N100 of the vehicle power supply 2. The control device 1 is also connected at one end to the positive pole P100 of the vehicle power supply 2 at a connection part 11 and at the other end to the negative pole N100 of the vehicle power supply 2 via a load 3. The other end of the connection part 11 is an OUTPUT terminal. The load 3 is an external component having one end connected to the other end of the connection part 11 of the control device 1 and the other end connected to the negative pole N100 of the vehicle power supply 2. The load 3 is, for example, an on-board device mounted on a train (not shown). The connection point of the Y capacitors 21 and 22, the connection point of the Y capacitors 28 and 29, the negative pole N100 of the vehicle power supply 2, the other end of the connection part 10 of the control device 1, and the other end of the load 3 are connected to an FG (Frame Ground) 4. FG4 is, for example, the body of a train (not shown).

[0012] In the control device 1, the power supply circuit 20 is a DC / DC converter that converts the voltage of the power supplied from the vehicle power supply 2 into a voltage that drives the control circuit 33, the photocoupler 42, and the photoMOS relay 44. To counter switching noise caused by the switching of the switching element 23, the power supply circuit 20 includes a Y capacitor 21 between the positive side of the power supply input and FG 4, a Y capacitor 22 between the negative side of the power supply input and FG 4, a capacitor 25 between the primary and secondary sides of the transformer 24, a Y capacitor 28 between the positive side of the power supply output and FG 4, and a Y capacitor 29 between the negative side of the power supply output and FG 4. In this embodiment, the power supply circuit 20 has a general configuration, and therefore a detailed description of the operation of the power supply circuit 20 will be omitted. The configuration of the power supply circuit 20 is not limited to the example shown in FIG. 1 . The power supply circuit 20 may have a configuration different from that shown in FIG. 1 as long as it includes a Y capacitor.

[0013] Inductors 31 and 32 are arranged on the first power supply lines 34 and 35. Specifically, as shown in Fig. 1, the inductor 31 is arranged on the first power supply line 34, and the inductor 32 is arranged on the first power supply line 35. That is, the control device 1 includes two first power supply lines 34 and 35, each having an inductor arranged thereon. The first power supply lines 34 and 35, on which the inductors 31 and 32 are arranged, are power supply lines that supply the first power from the power supply circuit 20 to the control circuit 33 and to a first input end to which the light-emitting diode 42a of the photocoupler 42 is connected.

[0014] No inductors are provided on the second power supply lines 36, 37. That is, the control device 1 includes two second power supply lines 36, 37 that do not have inductors. The second power supply lines 36, 37 are power supply lines that supply the second power from the power supply circuit 20 to a first output terminal to which the light-receiving element 42b of the photocoupler 42 is connected and to a second input terminal to which the light-emitting diode 44a of the photoMOS relay 44 is connected.

[0015] The control circuit 33 receives a first power supply from the power supply circuit 20 via two first power supply lines 34 and 35. The control circuit 33 controls the base current of the transistor 41 to turn the transistor 41 on and off. By turning the transistor 41 on and off, the control circuit 33 can ultimately control the operation of the load 3.

[0016] The transistor 41 is controlled to be turned on and off by the control circuit 33. When the transistor 41 is turned on under the control of the control circuit 33, the first power is conducted to the light-emitting diode 42a at the first input terminal of the photocoupler 42, causing the light-emitting diode 42a to emit light. The resistor 43 is a resistor for adjusting the magnitude of the first power supplied from the power supply circuit 20. The resistor 45 is a resistor for adjusting the magnitude of the second power supplied from the power supply circuit 20.

[0017] The photocoupler 42 includes a light-emitting diode 42a and a light-receiving element 42b. The photocoupler 42 also has a first input terminal and a first output terminal, with the light-emitting diode 42a connected to the first input terminal and the light-receiving element 42b connected to the first output terminal. As shown in Fig. 1 , a first power is supplied from the power supply circuit 20 to the light-emitting diode 42a at the first input terminal via two first power supply lines 34 and 35, and a second power is supplied from the power supply circuit 20 to the light-receiving element 42b at the first output terminal via two second power supply lines 36 and 37.

[0018] The photo MOS relay 44 includes a light-emitting diode 44a and a light-receiving element 44b. The photo MOS relay 44 also has a second input terminal and a second output terminal, with the light-emitting diode 44a connected to the second input terminal and the light-receiving element 44b connected to the second output terminal. As shown in Fig. 1, the light-emitting diode 44a at the second input terminal receives second power from the power supply circuit 20 via two second power supply lines 36 and 37, and the light-receiving element 44b at the second output terminal receives third power from the vehicle power supply 2 and is connected to an external load 3.

[0019] In this embodiment, as described above, the control circuit 33 can control the conduction of the first power to the light-emitting diode 42a at the first input terminal of the photocoupler 42 by controlling the on / off of the transistor 41. By conducting the first power to the light-emitting diode 42a at the first input terminal of the photocoupler 42, the control circuit 33 causes the light-emitting diode 42a at the first input terminal of the photocoupler 42 to emit light, thereby conducting the second power to the light-receiving element 42b at the first output terminal of the photocoupler 42. Since the light-receiving element 42b at the first output terminal of the photocoupler 42 and the light-emitting diode 44a at the second input terminal of the photoMOS relay 44 are connected in series, the control circuit 33 can conduct the second power to the light-receiving element 42b at the first output terminal of the photocoupler 42, thereby conducting the second power to the light-emitting diode 44a at the second input terminal of the photoMOS relay 44. The control circuit 33 conducts the second power to the light-emitting diode 44a at the second input end of the photo MOS relay 44, causing the light-emitting diode 44a at the second input end of the photo MOS relay 44 to emit light, thereby conducting the third power from the vehicle power supply 2 to the light-receiving element 44b at the second output end of the photo MOS relay 44. Then, the control circuit 33 conducts the third power from the vehicle power supply 2 to the light-receiving element 44b at the second output end of the photo MOS relay 44, thereby supplying the third power from the vehicle power supply 2 to the load 3 and controlling the operation of the load 3.

[0020] As explained in the background art, it is assumed that the photocoupler 42, photoMOS relay 44, and the like have internal parasitic capacitance. FIG. 2 is a diagram illustrating the parasitic capacitance present in the control device 1 according to the first embodiment. The control device 1 illustrated in FIG. 2 adds parasitic capacitance to the photocoupler 42 and photoMOS relay 44 compared to the control device 1 illustrated in FIG. 1. However, in reality, parasitic capacitance also exists between wirings, between wirings and the housing, and the like. When parasitic capacitance exists within the control device 1 as illustrated in FIG. 2, common-mode noise occurs in the load 3. In other words, when the load 3 becomes a common-mode noise source, a loop is generated in which the common-mode noise flows inside the control device 1 and returns to the noise source from the FG 4. FIG. 3 is a diagram illustrating a circuit configuration in which the load 3 connected to the control device 1 according to the first embodiment becomes a common-mode noise source. As illustrated in FIG. 3, when the load 3 becomes a common-mode noise source, the noise source can be considered to have a circuit configuration in which one end is connected to the other end of the connection unit 11 of the control device 1, just like the load 3, but the other end is connected to the FG 4. In such a case, if common mode noise flows into the control circuit 33, the control circuit 33 may malfunction, possibly affecting the control of the load 3.

[0021] However, in this embodiment, inductors 31 and 32 are provided on first power supply lines 34 and 35, through which first power is supplied from power supply circuit 20 to control circuit 33. Because inductors 31 and 32 are provided on first power supply lines 34 and 35, the impedance of first power supply lines 34 and 35 is greater than the impedance of second power supply lines 36 and 37, which do not have inductors. Therefore, even when common-mode noise flows inside control device 1, more of the common-mode noise flows through second power supply lines 36 and 37, which have lower impedance, than through first power supply lines 34 and 35, to which control circuit 33 is connected. FIG. 4 is a diagram illustrating an example of paths 61 to 63 through which common-mode noise flows in control device 1 according to embodiment 1. Compared to FIG. 3, FIG. 4 additionally illustrates paths 61 to 63 through which common-mode noise flows into control device 1. Due to the impedance relationship of each power supply line inside control device 1 described above, it is considered that most of the common-mode noise flows through paths 61 and 62, and almost none flows through path 63.

[0022] Path 61 is a path that runs from the noise source via connection 11, the parasitic capacitance of photoMOS relay 44, resistor 45, second power line 36, Y capacitor 28, the junction of Y capacitors 28 and 29, and FG4 before returning to the noise source. Path 62 is a path that runs from the noise source via connection 11, the parasitic capacitance of photoMOS relay 44, light-receiving element 42b of photocoupler 42, second power line 37, Y capacitor 29, the junction of Y capacitors 28 and 29, and FG4 before returning to the noise source. Path 63 is a path that runs from the noise source via connection 11, the parasitic capacitance of photoMOS relay 44, the parasitic capacitance of photocoupler 42, transistor 41, control circuit 33, first power line 35, inductor 32, Y capacitor 29, the junction of Y capacitors 28 and 29, and FG4 before returning to the noise source. Path 63 may be a path that runs from the noise source back to the noise source via connection 11, the parasitic capacitance of photo MOS relay 44, the parasitic capacitance of photocoupler 42, transistor 41, control circuit 33, first power supply line 34, inductor 31, Y capacitor 28, the connection point between Y capacitors 28 and 29, and FG 4. Paths 61 to 63 shown in Fig. 4 are examples, and parasitic capacitance may also exist between wires, between wires and the vehicle body, etc.

[0023] In this way, when common mode noise, the noise source of which is the load 3, flows into the control device 1, the total amount of common mode noise flowing through the two second power supply lines 36, 37 becomes greater than the total amount of common mode noise flowing through the two first power supply lines 34, 35.

[0024] In the present embodiment, the photocoupler 42 is used as the first non-contact relay and the photoMOS relay 44 is used as the second non-contact relay, but this is not limiting. The control device 1 may use a photoMOS relay as the first non-contact relay and a photocoupler as the second non-contact relay. The control device 1 may also use photocouplers or photoMOS relays as both the first and second non-contact relays. The control device 1 may also use mechanical relays as the first and second non-contact relays. In this way, the control device 1 may use a photocoupler, a photoMOS relay, or a mechanical relay as the first and second non-contact relays.

[0025] As described above, according to the present embodiment, control device 1 supplies first power from power supply circuit 20 to control circuit 33 and light-emitting diode 42a at the first input end of photocoupler 42, which is a first non-contact relay, via first power supply line 34 on which inductor 31 is disposed and first power supply line 35 on which inductor 32 is disposed. Control device 1 also supplies second power from power supply circuit 20 to light-receiving element 42b at the first output end of photocoupler 42, which is a first non-contact relay, and light-emitting diode 44a at the second input end of photoMOS relay 44, which is a second non-contact relay, via second power supply lines 36 and 37. Even when common-mode noise originating from load 3 as a noise source is generated and flows through control device 1, control device 1 can allow more common-mode noise to flow through second power supply lines 36 and 37 than through first power supply lines 34 and 35 to which control circuit 33 is connected. This reduces malfunction of control circuit 33 due to common-mode noise. That is, the control device 1 is equipped with a non-contact relay and is capable of reducing the inflow of noise into a desired path via parasitic capacitance, specifically, into the first power supply lines 34 and 35 to which the control circuit 33 is connected.

[0026] Embodiment 2 In the first embodiment, a DO circuit has been specifically described as an example of the control device 1. In the second embodiment, a DI (D i This will be explained using an example of a digital input circuit.

[0027] FIG. 5 illustrates a configuration example of a control device 1a according to a second embodiment. The control device 1a is a DI circuit used in a train (not shown) or the like. The control device 1a is connected to a vehicle power source 2 and a switch 5. The control device 1a acquires operation information received by the switch 5 using a control circuit 33a. The control device 1a includes connections 10 and 11, a power supply circuit 20, a first power supply line 34 on which an inductor 31 is disposed, a second power supply line 35 on which an inductor 32 is disposed, a control circuit 33a, second power supply lines 36 and 37, resistors 51, 53, and 56, photocouplers 52 and 54, and a diode 55. The configuration of the power supply circuit 20 according to the second embodiment shown in FIG. 5 is similar to the configuration of the power supply circuit 20 according to the first embodiment shown in FIG. 1 and the like. In the following description, the photocoupler 52 may be referred to as a first non-contact relay, and the photocoupler 54 may be referred to as a second non-contact relay.

[0028] The control device 1a is connected at one end to a positive electrode P100 of the vehicle power supply 2 through a connection 10, and at the other end to a negative electrode N100 of the vehicle power supply 2 through the connection 10. The control device 1a is also connected at one end to the positive electrode P100 of the vehicle power supply 2 through a connection 11, and at the other end to the negative electrode N100 of the vehicle power supply 2 through a switch 5. The other end of the connection 11 is an INPUT terminal. The switch 5 is an external component having one end connected to the other end of the connection 11 of the control device 1a and the other end connected to the negative electrode N100 of the vehicle power supply 2. The switch 5 is an on-board device that is operated, for example, by a train crew member (not shown). The connection point of the Y capacitors 21 and 22, the connection point of the Y capacitors 28 and 29, the negative electrode N100 of the vehicle power supply 2, the other end of the connection 10 of the control device 1, and the other end of the switch 5 are connected to an FG4.

[0029] Inductors 31 and 32 are arranged on the first power supply lines 34 and 35. Specifically, as shown in Fig. 5, inductor 31 is arranged on the first power supply line 34, and inductor 32 is arranged on the first power supply line 35. That is, the control device 1a includes two first power supply lines 34 and 35, each having an inductor arranged thereon. The first power supply lines 34 and 35, on which inductors 31 and 32 are arranged, are power supply lines that supply the first power from the power supply circuit 20 to the control circuit 33a and the first output end to which the light-receiving element 52b of the photocoupler 52 is connected.

[0030] No inductors are provided on the second power supply lines 36, 37. That is, the control device 1a includes two second power supply lines 36, 37 that do not have inductors. The second power supply lines 36, 37 are power supply lines that supply the second power from the power supply circuit 20 to a first input terminal to which the light-emitting diode 52a of the photocoupler 52 is connected and to a second output terminal to which the light-receiving element 54b of the photocoupler 54 is connected.

[0031] The control circuit 33a is supplied with the first power from the power supply circuit 20 via two first power supply lines 34 and 35. The control circuit 33a acquires information on the operation accepted by the switch 5.

[0032] Resistor 51 is a resistor for adjusting the magnitude of the first power supplied from power supply circuit 20. Resistor 53 is a resistor for adjusting the magnitude of the second power supplied from power supply circuit 20. Diode 55 is connected in parallel to photocoupler 54. Resistor 56 is a resistor for adjusting the magnitude of the third power supplied from vehicle power supply 2.

[0033] The photocoupler 52 includes a light-emitting diode 52a and a light-receiving element 52b. The photocoupler 52 has a first input terminal and a first output terminal, with the light-emitting diode 52a connected to the first input terminal and the light-receiving element 52b connected to the first output terminal. As shown in Fig. 5, a first power is supplied from the power supply circuit 20 to the light-receiving element 52b at the first output terminal via two first power supply lines 34 and 35, and a second power is supplied from the power supply circuit 20 to the light-emitting diode 52a at the first input terminal via two second power supply lines 36 and 37.

[0034] Photocoupler 54 includes light-emitting diode 54a and light-receiving element 54b. Photocoupler 54 also has a second input terminal and a second output terminal, with light-emitting diode 54a connected to the second input terminal and light-receiving element 54b connected to the second output terminal. As shown in Fig. 5, second power is supplied to light-receiving element 54b at the second output terminal from power supply circuit 20 via two second power supply lines 36 and 37, and light-emitting diode 54a at the second input terminal is supplied with third power from vehicle power supply 2 and is connected to external switch 5.

[0035] In the present embodiment, in the control device 1a, third power is conducted to the switch 5 and the light-emitting diode 54a at the second input end of the photocoupler 54 in response to an operation received by the switch 5, causing the light-emitting diode 54a at the second input end of the photocoupler 54 to emit light, and therefore the second power is conducted to the light-receiving element 54b at the second output end of the photocoupler 54. Since the light-receiving element 52b at the second output end of the photocoupler 54 and the light-emitting diode 52a at the first input end of the photocoupler 52 are connected in series, in the control device 1a, the second power is conducted to the light-receiving element 54b at the second output end of the photocoupler 54, and therefore the second power is conducted to the light-emitting diode 52a at the first input end of the photocoupler 52. When the second power is conducted to the light-emitting diode 52a at the first input end of the photocoupler 52, the light-emitting diode 52a at the first input end of the photocoupler 52 emits light, and therefore the first power is conducted to the light-receiving element 52b at the first output end of the photocoupler 52. When the first power is conducted to the light-receiving element 52b at the first output end of the photocoupler 52, the first power that can be detected by the control circuit 33a fluctuates, and the fluctuation of the first power corresponds to the operation accepted by the switch 5. Therefore, the control circuit 33a can obtain information about the operation accepted by the switch 5 based on the fluctuation of the first power conducted to the light-receiving element 52b at the first output end of the photocoupler 52.

[0036] As explained in the background art, it is assumed that photocouplers 52 and 54, etc., have internal parasitic capacitance. FIG. 6 is a diagram illustrating the parasitic capacitance present in a control device 1a according to the second embodiment. The control device 1a shown in FIG. 6 has additional parasitic capacitance within photocouplers 52 and 54 compared to the control device 1a shown in FIG. 5. However, in reality, parasitic capacitance also exists between wires, between wires and the housing, and so on. When parasitic capacitance exists within the control device 1a as shown in FIG. 6, common-mode noise is generated in switch 5. In other words, when switch 5 becomes a common-mode noise source, a loop is generated in which the common-mode noise flows through the control device 1a and returns to the noise source from FG4. FIG. 7 is a diagram illustrating a circuit configuration in which switch 5 connected to the control device 1a according to the second embodiment becomes a common-mode noise source. As shown in FIG. 7, when switch 5 becomes a common-mode noise source, the noise source can be considered to have one end connected to the other end of connection unit 11 of the control device 1a, like switch 5, but the other end connected to FG4. In such a case, if common mode noise flows into the control circuit 33a, the control circuit 33a may malfunction, which may affect the acquisition of information on the operation received by the switch 5.

[0037] However, in this embodiment, inductors 31 and 32 are provided on the first power supply lines 34 and 35 through which the first power is supplied from the power supply circuit 20 to the control circuit 33a. Because the inductors 31 and 32 are provided on the first power supply lines 34 and 35, the impedance of the first power supply lines 34 and 35 is greater than the impedance of the second power supply lines 36 and 37, which do not have inductors. Therefore, even when common-mode noise flows inside the control device 1a, more of the common-mode noise flows through the second power supply lines 36 and 37, which have lower impedance, than through the first power supply lines 34 and 35 to which the control circuit 33a is connected. FIG. 8 is a diagram illustrating an example of paths 71 to 73 through which common-mode noise flows in the control device 1a according to the second embodiment. Compared to FIG. 7, FIG. 8 adds paths 71 to 73 through which common-mode noise flows in the control device 1a. Due to the impedance relationships of the power supply lines inside the control device 1a described above, it is considered that most of the common-mode noise flows through paths 71 and 72, and almost none flows through path 73.

[0038] Path 71 is a path that runs from the noise source via connection 11, the parasitic capacitance of photocoupler 54, light-emitting diode 52a of photocoupler 52, resistor 53, second power supply line 36, Y capacitor 28, the junction of Y capacitors 28 and 29, and FG4, and then returns to the noise source. Path 72 is a path that runs from the noise source via connection 11, the parasitic capacitance of photocoupler 54, second power supply line 37, Y capacitor 29, the junction of Y capacitors 28 and 29, and FG4, and then returns to the noise source. Path 73 is a path that runs from the noise source via connection 11, the parasitic capacitance of photocoupler 54, the parasitic capacitance of photocoupler 52, control circuit 33a, first power supply line 35, inductor 32, Y capacitor 29, the junction of Y capacitors 28 and 29, and FG4, and then returns to the noise source. Path 73 may be a path that runs from the noise source via connection 11, the parasitic capacitance of photocoupler 54, the parasitic capacitance of photocoupler 52, control circuit 33a, first power supply line 34, inductor 31, Y capacitor 28, the connection point between Y capacitors 28 and 29, and FG 4, and returns to the noise source. Paths 71 to 73 shown in Fig. 8 are examples, and parasitic capacitance may also exist between wires, between wires and the vehicle body, etc.

[0039] In this way, when common mode noise, the source of which is the switch 5, flows into the control device 1a, the total amount of common mode noise flowing through the two second power supply lines 36, 37 becomes greater than the total amount of common mode noise flowing through the two first power supply lines 34, 35.

[0040] In this embodiment, the photocoupler 52 is used as the first non-contact relay and the photocoupler 54 is used as the second non-contact relay, but this is not limiting. The control device 1a may use photoMOS relays as both the first non-contact relay and the second non-contact relay. Furthermore, the control device 1a may use a photocoupler for one of the first non-contact relay and the second non-contact relay and a photoMOS relay for the other. Furthermore, the control device 1a may use mechanical relays as the first non-contact relay and the second non-contact relay. In this way, the control device 1a may use a photocoupler, a photoMOS relay, or a mechanical relay as the first non-contact relay and the second non-contact relay.

[0041] As described above, according to the present embodiment, the control device 1a supplies first power from the power supply circuit 20 to the control circuit 33a and the light-receiving element 52b at the first output end of the photocoupler 52, which is a first non-contact relay, via the first power supply line 34 on which the inductor 31 is disposed and the first power supply line 35 on which the inductor 32 is disposed. The control device 1a also supplies second power from the power supply circuit 20 to the light-emitting diode 52a at the first input end of the photocoupler 52, which is a first non-contact relay, and the light-receiving element 54b at the second output end of the photocoupler 54, which is a second non-contact relay, via the second power supply lines 36 and 37. Thus, even when common-mode noise originating from the switch 5 as a noise source is generated and flows inside the control device 1a, the control device 1a can allow more common-mode noise to flow through the second power supply lines 36 and 37 than through the first power supply lines 34 and 35 to which the control circuit 33a is connected. This reduces malfunction of the control circuit 33a due to the common-mode noise. That is, the control device 1a includes a non-contact relay and can reduce the inflow of noise into a desired path via parasitic capacitance, specifically, into the first power supply lines 34 and 35 to which the control circuit 33a is connected.

[0042] In the control device 1 of the first embodiment, in the photocoupler 42 serving as the first non-contact relay, the first power is supplied to the light-emitting diode 42a at the first input end and the second power is supplied to the light-receiving element 42b at the first output end, and in the photoMOS relay 44 serving as the second non-contact relay, the second power is supplied to the light-emitting diode 44a at the second input end and the third power is supplied to the light-receiving element 44b at the second output end. In contrast, in the control device 1a of the second embodiment, in the photocoupler 52 serving as the first non-contact relay, the first power is supplied to the light-receiving element 52b at the first output end and the second power is supplied to the light-emitting diode 52a at the first input end, and in the photocoupler 54 serving as the second non-contact relay, the second power is supplied to the light-receiving element 54b at the second output end and the third power is supplied to the light-emitting diode 54a at the second input end.

[0043] As described above, the control device 1 of the first embodiment and the control device 1a of the second embodiment have different powers supplied to the input terminals and output terminals of the non-contact relays, but can achieve the same effects as described above. That is, the control devices 1 and 1a only need to include a first non-contact relay having a first input terminal and a first output terminal, one terminal of which is supplied with a first power from the power supply circuit 20 via two first power supply lines 34 and 35 and the other terminal of which is supplied with a second power from the power supply circuit 20 via two second power supply lines 36 and 37, and a second non-contact relay having a second input terminal and a second output terminal, one terminal of which is supplied with the second power from the power supply circuit 20 via the two second power supply lines 36 and 37 and the other terminal of which is supplied with a third power and to which an external configuration is connected.

[0044] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or different embodiments may be combined with each other. It is also possible to omit or modify parts of the configurations as long as they do not deviate from the gist of the invention. [Explanation of symbols]

[0045] 1,1a control device, 2 vehicle power supply, 3 load, 4 FG, 5 switch, 10,11 connection part, 20 power supply circuit, 21,22,28,29 Y capacitor, 23 switching element, 24 transformer, 25,27 capacitor, 26,55 diode, 31,32 inductor, 33,33a control circuit, 34,35 first power supply line, 36,37 second power supply line, 41 transistor, 42,52,54 photocoupler, 42a,44a,52a,54a light-emitting diode, 42b,44b,52b,54b light-receiving element, 43,45,51,53,56 resistor, 44 photoMOS relay, 61-63,71-73 path.

Claims

1. two first power supply lines each having an inductor disposed thereon; two second power supply lines each having no inductor disposed thereon; a control circuit to which a first power is supplied from a power supply circuit via the two first power supply lines; a first non-contact relay having a first input terminal and a first output terminal, one of which is supplied with the first power from the power supply circuit via the two first power supply lines, and the other of which is supplied with the second power from the power supply circuit via the two second power supply lines; a second non-contact relay having a second input terminal and a second output terminal, one of which is supplied with the second power from the power supply circuit via the two second power supply lines, and the other of which is supplied with a third power, and which is connected to an external configuration; Equipped with the external component is a load; The control circuit A controllable first input terminal of the first non-contact relay controls conduction of the first power; conducting the first power to the first input terminal of the first non-contact relay to conduct the second power to the first output terminal of the first non-contact relay; conducting the second power to the first output terminal of the first non-contact relay, thereby conducting the second power to the second input terminal of the second non-contact relay; conducting the second power to the second input terminal of the second non-contact relay to conduct the third power to the second output terminal of the second non-contact relay; conducting the third power to the second output terminal of the second non-contact relay to supply the third power to the load and control the operation of the load; A control device characterized by:

2. When common mode noise caused by the load as a noise source flows into the control device, the total amount of the common mode noise flowing through the two second power supply lines is greater than the total amount of the common mode noise flowing through the two first power supply lines.

2. The control device according to claim 1.

3. Two first power supply lines, each having an inductor disposed thereon; two second power supply lines each having no inductor disposed thereon; a control circuit to which a first power is supplied from a power supply circuit via the two first power supply lines; a first non-contact relay having a first input terminal and a first output terminal, one of which is supplied with the first power from the power supply circuit via the two first power supply lines, and the other of which is supplied with the second power from the power supply circuit via the two second power supply lines; a second non-contact relay having a second input terminal and a second output terminal, one of which is supplied with the second power from the power supply circuit via the two second power supply lines, and the other of which is supplied with a third power, and which is connected to an external configuration; Equipped with the external component is a switch; the third power is conducted to the switch and the second input terminal of the second non-contact relay in response to an operation received by the switch, thereby conducting the second power to the second output terminal of the second non-contact relay; the second power is conducted to the second output terminal of the second non-contact relay, whereby the second power is conducted to the first input terminal of the first non-contact relay; When the second power is conducted to the first input terminal of the first non-contact relay, the first power is conducted to the first output terminal of the first non-contact relay; When the first power is conducted to the first output terminal of the first non-contact relay, the control circuit acquires information about the operation received by the switch based on a fluctuation in the first power conducted to the first output terminal of the first non-contact relay. A control device characterized by:

4. When common mode noise caused by the switch as a noise source flows into the control device, the total amount of the common mode noise flowing through the two second power supply lines is greater than the total amount of the common mode noise flowing through the two first power supply lines.

4. The control device according to claim 3.

5. The first non-contact relay and the second non-contact relay are a photocoupler, a photometal-oxide-semiconductor field-effect transistor relay, or a mechanical relay.

5. The control device according to claim 1, wherein the control device is a control unit for controlling a vehicle.

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