TW201712719A - Dc circuit, dc power supply device, moving body, and power supply system - Google Patents

Abstract

To provide a DC circuit capable of ensuring safety even if a short circuit should occur due to the deterioration time of a semiconductor switch when using said semiconductor switch to suppress arcing. Provided is a DC circuit comprising: a first current pathway and a second current pathway, which are provided in parallel on a path along which a direct current flows; and a circuit that uses a semiconductor switch to suppress the occurrence of arcs when the direct current in the second current pathway is interrupted. The first current pathway is provided with at least a fuse thereon. If the fuse melts, the supply of direct current via the second current pathway is stopped. The fuse is rated so as not to melt under the rated conduction time and rated conduction current of the circuit.

Description

DC circuit, DC power supply device, mobile body and power supply system

The disclosure relates to a direct current circuit, a direct current power supply device, a moving body, and a power supply system.

Whether it is DC or AC, arcing occurs when the power is cut off. In the case of AC, there is an instant when the voltage becomes zero for every predetermined time (for example, every 10 milliseconds), so the arc discharge will naturally stop for at least the time specified in the above (for example, within 10 milliseconds). However, in the case of DC power supply, since there is no moment of zero voltage, the arc discharge does not stop naturally.

Therefore, the technique for suppressing the occurrence of arc discharge at the time of power interruption at the time of DC power supply has been disclosed (see Patent Documents 1, 2, etc.).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2003-203721

[Patent Document 2] Japanese Special Table 2014-522088

In the case of DC power supply, it is necessary to suppress the occurrence of arc discharge at the time of power cut, but the configuration required to suppress the generation of arc discharge may become large-scale rather than ideal, and it is added to suppress the occurrence of arc discharge. The required configuration results in a decrease in power supply efficiency in the DC power supply. Therefore, it is expected that the power efficiency at the time of DC power supply is not reduced, and the generation of arc discharge can be suppressed at the time of cutting off the DC power with a small-scale configuration.

Therefore, in the present disclosure, it is proposed to suppress the occurrence of arc discharge at the time of cutting off the direct current power without reducing the power efficiency at the time of supplying the direct current power, and to use the semiconductor for suppressing the arc discharge. At the time of switching, even if a short circuit occurs due to deterioration of the semiconductor switch, it is possible to secure a novel, improved DC circuit, a DC power supply device, a moving body, and a power supply system.

According to the present disclosure, there is provided a DC circuit comprising: a first current path and a second current path which are arranged in parallel in a path through which a direct current flows; and a circuit which is set to be first in a first current The semiconductor switch on the path suppresses the generation of the arc when the DC blocking in the second current path is preceded; at least the fuse is provided in the first current path; and the second current path is stopped before the fuse is blown. The supply of direct current; the pre-fuse fuse has a rating that does not blow under the rated energization time of the pre-recorded circuit and the rated energizing current.

Further, according to the present disclosure, a DC power supply device including: a DC power supply for supplying DC power; and a first current path and a second current path are provided in parallel in a path through which DC flows; And the circuit uses the semiconductor switch provided in the first current path to suppress the occurrence of the arc during the DC blocking in the second current path; the first current path has at least a fuse; When the fuse is blown, the supply of DC due to the second current path is stopped. The pre-fuse has a rating that does not melt under the rated energization time of the pre-recorded circuit and the rated energization current.

As described above, according to the present disclosure, it is possible to provide a method for suppressing the occurrence of arc discharge at the time of cutting off DC power without reducing the power efficiency at the time of DC power supply, and at the same time, at the same time, in the arc When a semiconductor is used for suppression of discharge, even if a short circuit occurs due to deterioration of the semiconductor, safety can be ensured, and a DC circuit, a DC power supply device, a moving body, and a power supply system can be improved.

In addition, the above-mentioned effects are not necessarily limited, and the effects disclosed in the present specification or other effects that can be grasped according to the present specification can be achieved in conjunction with the above-described effects or in place of the above-described effects.

1a‧‧‧Contacts

1b‧‧‧Contacts

10‧‧‧ load

11‧‧‧ plug

11a‧‧‧positive side terminal

11b‧‧‧Negative side terminal

20‧‧‧ socket

20a‧‧‧Contacts

20b‧‧‧Contacts

30‧‧‧Relay

100‧‧‧DC circuit

110‧‧‧Alarm fuse

110’‧‧‧Fuse

111‧‧‧Fuse

112‧‧‧ Keep the line

113‧‧‧ Obstruction agencies

114‧‧‧Alarm contacts

115‧‧‧ Spring

121‧‧‧Slider

C1‧‧‧ capacitor

C11‧‧‧ capacitor

C12‧‧‧ capacitor

D1‧‧‧ diode

D11‧‧‧ diode

D12‧‧‧ diode

D13‧‧‧ diode

D2‧‧‧ diode

E1‧‧‧ conductor

E2‧‧‧ conductor

F1‧‧‧ conductor

F2‧‧‧ conductor

R1‧‧‧ resistance

R11‧‧‧ resistance

RY1‧‧‧Mechanical relay

SW1‧‧‧ switch

Fig. 1 is an explanatory diagram showing a configuration example of a DC power supply device including a DC circuit according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a configuration example of a DC power supply device including a DC circuit according to an embodiment of the present disclosure.

[Fig. 3] An explanatory diagram showing a temporal change of current in a graph.

Fig. 4 is an explanatory diagram showing a configuration example of a DC circuit according to an embodiment of the present disclosure.

Fig. 5 is an explanatory diagram showing a configuration example of a DC circuit according to an embodiment of the present invention.

Fig. 6 is an explanatory diagram showing an example of a fuse characteristic of a fuse.

Fig. 7 is an explanatory diagram of a configuration example of an alarm fuse.

8 is an explanatory diagram of a configuration example of an alarm fuse.

Fig. 9 is an explanatory diagram showing a configuration example of a DC circuit according to an embodiment of the present disclosure.

Fig. 10 is an explanatory diagram showing a configuration example of a DC circuit according to an embodiment of the present disclosure.

Fig. 11 is an explanatory diagram showing a configuration example of a DC circuit according to an embodiment of the present invention.

[Fig. 12] An explanatory diagram showing a temporal change of current in a graph.

FIG. 13 is an explanatory diagram showing a functional configuration example of an electric drive body including a DC circuit according to an embodiment of the present disclosure.

Hereinafter, a preferred embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, the components that have substantially the same functional configuration are denoted by the same reference numerals, and the description thereof will not be repeated.

In addition, the explanation is performed in the following order.

1. An embodiment of the present disclosure

1.1. Background

1.2. Composition example

2. Summary

<1. An embodiment of the present disclosure> [1.1. Background]

Before describing in detail one embodiment of the present disclosure, a background of an embodiment of the present disclosure will be described.

Regardless of the DC power supply or the AC power supply, when the voltage and current reach a certain value or more when the power is cut off, a spark or an arc discharge due to a potential difference between the electrodes is generated. In the case of AC, there is an instant when the voltage becomes zero for every predetermined time (for example, every 10 milliseconds), so the arc discharge will naturally stop for at least the time specified in the above (for example, within 10 milliseconds).

However, in the case of DC power supply, unlike the AC power supply, there is no moment when the voltage becomes zero, so the arc discharge does not stop naturally. Arc discharge, which causes the deterioration of joints such as metal melting and welding, There are concerns about reducing the reliability of power supply.

Therefore, the technique for suppressing the occurrence of arc discharge at the time of power cut at the time of DC power supply has been disclosed. For example, a buffer circuit using a capacitor and a resistor, a technique of connecting between shaking contactors, has been proposed.

However, in the case of DC power supply, in order to prevent arc discharge by using a snubber circuit, if a capacitor having a large capacitance and a small resistance are used, a sufficient effect cannot be obtained, and if sufficient effect is obtained, the snubber circuit will be obtained. It has become larger. Further, when the snubber circuit is used to prevent the arc discharge, if the DC power supply is attempted to be reconnected after the DC power is cut off, the short-circuit current due to the charge charged in the capacitor having a large capacitance becomes large, resulting in an increase in the short-circuit current. The joint is welded.

Further, when the plug is connected to the socket for DC power supply, a mechanical switch is provided on the plug to prevent arc discharge, and the mechanical switch is operated when the plug is removed from the socket. Techniques for preventing the occurrence of arc discharge are also present. However, in this technique, it is necessary to operate the mechanical switch when the plug is removed, which requires the user to perform such complicated operations.

There is also a method of mechanically removing the arc discharge. However, in order to mechanically remove the arc discharge, it is necessary to increase the speed at which the contact is pulled off, or the structure in which the arc is pulled away by a magnetic circuit, etc., resulting in an increase in the size of the circuit required for removing the arc discharge.

In the case of suppressing the occurrence of arc discharge at the time of power interruption at the time of DC power supply, Patent Documents 1, 2, and the like are described.

Patent Document 1 discloses a technique in which a switching element is provided on a path through which a current flows during DC power supply, and a switching element is turned off when a plug is removed from a socket, thereby suppressing generation of an arc discharge.

However, in the technique disclosed in Patent Document 1, since the current passes through the switching element during the DC power supply, power is consumed in the switching element during DC power supply, and the switching element generates heat when DC power is supplied.

Patent Document 2 also discloses that an arc absorbing circuit including a switching element is provided on a path through which a current flows during DC power supply, and a switching element is turned off when a plug is removed from a socket, thereby suppressing generation of arc discharge. technology.

However, in the technique disclosed in Patent Document 2, as the arc absorbing circuit, two switching elements and a timer for turning off the switching element are provided, and the arc power is temporarily saved, and it is necessary to have The circuit will be enlarged by letting the saved power flow out of the required circuit.

In view of the above-mentioned background, the present inventors have been able to suppress the generation of arc discharge at the time of cutting off DC power with a small-scale configuration, without reducing the power efficiency at the time of DC power supply. In-depth discussion. As a result, as disclosed below, by providing two contacts on the electrode on the positive electrode side, it is possible to suppress the voltage generated between the electrodes when the DC power is cut off during switching with the electrode on the power receiving side. The technique of suppressing the generation of arc discharge at the time of cutting off the direct current power with a small-scale configuration without reducing the power efficiency at the time of DC power supply.

In addition, the present inventors have intensively studied techniques for ensuring safety even when a short circuit occurs due to deterioration of a semiconductor switch when a semiconductor switch is used for suppression of arc discharge. As a result, as disclosed below, the technique for ensuring safety even when a short circuit occurs due to deterioration of the semiconductor switch when a semiconductor switch is used for the suppression of arc discharge is derived.

The background of an embodiment of the present disclosure has been described above. Next, the embodiment of the present disclosure will be described in detail.

[1.2. Configuration example]

Fig. 1 is an explanatory diagram showing a configuration example of a DC power supply device including a DC circuit according to an embodiment of the present invention. FIG. 1 is a configuration example of a DC power supply device for supplying DC power supplied from a DC power source to a load. Hereinafter, a configuration example of a DC power supply device according to an embodiment of the present disclosure will be described with reference to Fig. 1 .

The DC power supply device shown in FIG. 1 supplies DC power supplied from the DC power source 200 to the load 10. The DC power source 200 outputs DC power of a predetermined voltage Vs. Then, the DC power supply device shown in FIG. 1 is provided between the positive electrode side of the DC power supply 200 and the load 10, and includes a DC circuit 100. The DC circuit 100 has a configuration for suppressing generation of arc discharge when the DC current from the DC power source 200 is blocked.

The DC circuit 100 includes: a MOSFET T1, a capacitor C1, a resistor R1, a diode D1, a switch SW1, and an alarm fuse 110. to make. The DC circuit 100 is a current flowing between a main system and a sub-system in parallel on a path through which a direct current flows. The system in which the switch SW1 is set is the main system, and the system in which the MOSFET T1 is set is the sub system.

In the MOSFET T1, an n-type MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is used in the present embodiment. Capacitor C1 is disposed between the drain terminal and the gate terminal of MOSFET T1. Further, the resistor R1 is provided between the gate terminal and the source terminal of the MOSFET T1. Capacitor C1 and resistor R1 are then connected in series. The circuit formed by the MOSFET T1, the capacitor C1, the resistor R1, and the diode D1 is provided to suppress the current flowing from the DC power source 200 to the load 10 when the switch SW1 is switched from the on state to the off state. Circuit.

The operation of the DC circuit 100 will be described. When the state of the switch SW1 is the off state, the MOSFET T1 is also in the off state, so that no current flows from the DC power source 200 to the load 10. Thereafter, once the switch SW1 is operated and the state of the switch SW1 is turned on, current flows from the DC power source 200 to the load 10, but in this state, the MOSFET T1 is subsequently turned off, and the MOSFET T1 does not. There will be current flowing.

Thereafter, once the switch SW1 is operated and the state of the switch SW1 is turned off, no current flows from the DC power source 200 to the load 10. At this time, since the voltage of the switch SW1 is turned off (the both ends of the switch SW1 have been cut away), the gate voltage of the MOSFET T1 is sensed by the capacitor C1. It should be induced to set MOSFET T1 to the on state. Once the MOSFET T1 is turned on, current flows from the DC power source 200 to the load 10 such that the voltage across the switch SW1 decreases.

The MOSFET T1 is turned on, and a current flows from the DC power supply 200 to the load 10 so that the voltage across the switch SW1 decreases, whereby the voltage across the switch SW1 is lowered. By the voltage drop across the switch SW1, even if the switch SW1 is turned off, the switch SW1 does not cause arcing.

The voltage between the 汲 terminal and the source terminal of MOSFET T1 converges to the voltage of the transfer function following the gate voltage of the FET. Once the switch SW1 is turned off, the charging of the capacitor C1 continues due to the voltage generated across the switch SW1, the gate voltage of the MOSFET T1 is lowered, and the MOSFET T1 is brought into the off state to make the MOSFET T1. There is no current flowing in the middle.

The diode D1 connected in parallel with the resistor R1 of the DC circuit 100 is discharged when the switch SW1 is turned from the off state to the on state, so that the charge accumulated in the capacitor C1 is discharged in a short time without interposing the resistor R1. And is set.

In the DC circuit 100, the diode D1 is provided in parallel with the resistor R1, whereby, for example, even if a phenomenon such as chattering occurs in the connection of the switch SW1, the voltage integration function of the DC circuit 100 can be recovered in a short time. The resistor R1 supplies a voltage to the gate terminal of the MOSFET T1, but the supply time of the voltage is determined by the relationship between the capacitance of the capacitor C1 and the product of the resistance of the resistor R1.

The alarm fuse 110 is such that once the excessive current flows in the sub-system in which the MOSFET T1 is disposed, the fuse portion is blown, and at the same time, the mechanism for preventing re-energization in the main system in which the switch SW1 is disposed is Set the fuse. The specific configuration example of the alarm fuse 110 is described later, but the alarm fuse 110 is provided with, for example, a mechanism for preventing re-energization in the main system by using an elastic force or the like when the fuse is blown.

In the DC circuit 100 shown in FIG. 1, in the normal state, that is, the switch SW1 is switched from the on state to the off state, from the MOSFET T1 to the on state, at the rated energization time of the alarm fuse 110 (fuse) The time until the MOSFET T1 is turned off in a short period of time, the alarm fuse 110 is not blown.

However, in the abnormal state, that is, the MOSFET T1 is faulty, the switch SW1 is switched from the on state to the off state, and since the MOSFET T1 is turned on, the MOSFET T1 is not shorter than the fuse time of the alarm fuse 110. When the state is turned off, current continues to flow in the fuse portion of the alarm fuse 110, and the alarm fuse 110 is blown. FIG. 2 is an explanatory diagram showing a state in which the alarm fuse 110 in the DC circuit 100 is blown.

Then, once the alarm fuse 110 is blown, in the main system in which the switch SW1 is set, the switch portion of the alarm fuse 110 is turned off. Once the switch portion of the alarm fuse 110 is turned off, even if the switch SW1 is turned on, no DC power is supplied from the DC power source 200 to the load. Therefore, the DC circuit 100 according to an embodiment of the present disclosure can prevent the operation of the switch SW1 when an abnormal state occurs. The re-energization caused by the operation can cause a failure in a safe direction.

FIG. 3 is an explanatory diagram showing a temporal change of a current flowing in the alarm fuse 110 in a graph. 3 is a diagram showing the time variation of the current I1 flowing in the alarm fuse 110 in the normal state and the time variation of the current 12 flowing in the alarm fuse 110 in the abnormal state of the DC circuit 100. .

When the DC circuit 100 is in a normal state, even if a current exceeding the rated current flows, the current I1 is lowered in a shorter time than the rated energization time (time until the fuse) of the alarm fuse 110. Therefore, in the normal state of the DC circuit 100, the alarm fuse 110 is not blown. However, when the DC circuit 100 is in an abnormal state, the MOSFET T1 does not become an off state and the current continues to flow. If a current exceeding the rated current flows beyond the rated energization time, the final alarm fuse 110 is blown and then the current I2 is generated. Will decrease.

That is, the DC circuit 100 utilizes a current that exceeds the rated current, and the alarm fuse 110 does not blow if it is shorter than the rated energization time, so even if the switch SW1 is switched from the on state to the off state, The generation of the arc discharge of the switch SW1 can still be suppressed. Further, when the DC circuit 100 is not in a normal state due to a failure of the MOSFET T1 or the like, re-energization between the main system and the sub-system from the DC power source 200 can be prevented by the fuse portion of the alarm fuse 110 being blown. .

The configuration example of the DC power supply device according to the embodiment of the present disclosure has been described above. Next, another configuration example of the DC power supply device according to the embodiment of the present disclosure will be described.

Fig. 4 is an explanatory diagram showing another configuration example of the DC power supply device according to the embodiment of the present invention. 4 is a configuration example of a DC power supply device for supplying DC power to a device in which a plug is inserted into a socket.

The DC power supply device shown in FIG. 4 is provided with a DC circuit 100 that suppresses arc discharge generated between the socket 20 and the plug 11 when the plug is removed from the socket. Further, although not shown in FIG. 4, a DC power supply for supplying DC power may be provided in the same manner as in FIGS. 1 and 2.

When the plug 11 is completely inserted into the socket 20 and the positive electrode side terminal 11a contacts both the contact 20a and the contact 20b and the contact 20a and the contact 20b are short-circuited, no current flows in the MOSFET T1. Once the plug 11 is initially removed from the socket 20, both ends of the MOSFET T1 become short-circuited due to the positive-side terminal 11a, so the MOSFET T1 is also in the off state.

Thereafter, if the plug 11 continues to be unplugged from the socket 20, the positive-electrode-side terminal 11a becomes contactless with the contact 20a, and only the contact 20b is contacted, and a part of the contact point of the positive-side terminal 11a and the contact 20a occurs. The current is concentrated, and the voltage due to the concentration of the current is generated between the contact 20a and the contact 20b.

The voltage generated between the contact 20a and the contact 20b causes the gate voltage of the MOSFET T1 to be induced inductively across the capacitor C1, and the MOSFET T1 is placed in an on state. Once the MOSFET T1 becomes conductive, the voltage drop between the contact 20a and the contact 20b is made. In the low direction, current will flow.

When the MOSFET T1 is turned on, a current flows in a direction in which the voltage between the contact 20a and the contact 20b is lowered, and a potential difference between the positive electrode side terminal 11a and the contact 20a is lowered. By the decrease in the potential difference between the positive electrode side terminal 11a and the contact 20a, even if the positive electrode side terminal 11a is separated from the contact 20a, the arc discharge does not occur.

The voltage between the 汲 terminal and the source terminal of MOSFET T1 converges to the voltage of the transfer function following the gate voltage of the FET. When the positive electrode side terminal 11a is separated from the contact 20a, the charging of the capacitor C1 is continued by the voltage generated between the contact 20a and the contact 20b, the gate voltage of the MOSFET T1 is lowered, and the MOSFET T1 becomes The off state causes no current to flow in MOSFET T1.

In the DC circuit 100 shown in FIG. 4, even if the positive electrode side terminal 11a is separated from the contact 20b after the MOSFET T1 is turned off, no current flows in the MOSFET T1, so that arc discharge does not occur.

The diode D1 connected in parallel with the resistor R1 of the DC circuit 100 is in a case where the positive electrode side terminal 11a is in contact with both the contact 20a and the contact 20b, and the contact 20a and the contact 20b are short-circuited. The electric charge accumulated in the capacitor C1 is discharged in a short time via the resistor R1, and is set.

In the DC circuit 100, the diode D1 is connected to the resistor R1. Parallel arrangement, whereby, for example, the connection of the contact 20a and the contact 20b, even if a phenomenon such as chattering occurs, the voltage integration function of the DC circuit 100 can be recovered in a short time. The resistor R1 supplies a voltage to the gate terminal of the MOSFET T1, but the supply time of the voltage is determined by the relationship between the capacitance of the capacitor C1 and the product of the resistance of the resistor R1.

Fig. 5 is an explanatory diagram showing another configuration example of the DC power supply device according to the embodiment of the present invention. FIG. 5 shows an example of a configuration of a DC power supply device for supplying DC power supplied from a DC power source to a load.

The DC power supply device shown in Fig. 5 employs a relay 30 for switching between supply and interruption of DC power. The relay 30 switches the switch in accordance with the electromagnetic force generated by the current from a power source not shown. By switching the switch by the relay 30, the DC power supply device shown in Fig. 5 can switch the supply and the interruption of the DC power. Further, although not shown in FIG. 5, a DC power supply for supplying DC power may be provided in the same manner as in FIGS. 1 and 2.

As shown in FIG. 5, in the case where the relay 30 is used for switching between the supply and the interruption of the direct current power, the direct current power supply device is provided with the direct current circuit 100, and when the abnormal state occurs, the operation of the switch SW1 can be prevented. The re-energization caused by the failure can occur in a safe direction.

Fig. 6 is an explanatory view showing an example of a fuse characteristic of a fuse. As shown in Fig. 6, the fuse is not energized even if there is a current higher than the rated current during the energization of the short time. For example, 10A fuse system In the normal use, if a current of 12 A or more continues to flow, the current will flow. However, as shown in FIG. 6, if it is 0.1 second or less, it will not be melted even if it flows through 35A.

FIG. 7 is an explanatory diagram of a configuration example of the alarm fuse 110. As shown in FIG. 7, the alarm fuse 110 includes a fuse 111, a holding wire 112, an obstruction mechanism 113, an alarm contact 114, and a spring 115. Fig. 7 shows a state in which the fuse 111 has not been blown. E1 and E2 shown in FIG. 7 are conductors through which current flows in the main system of the DC circuit 100, and F1 and F2 are conductors through which current flows to the sub-system in the DC circuit 100.

As shown in FIG. 7, the conductors E1 and E2 shown in FIG. 7 are braked by the tension of the holding wire 112 in a state where the fuse 111 is not blown by the current flowing through the conductors F1 and F2. Point 114 is connected. Therefore, in a state where the fuse 111 is not blown, the alarm fuse 110 can flow current to the main system.

Fig. 8 is an explanatory view showing a state in which the fuse 111 of the alarm fuse 110 shown in Fig. 7 has been blown. As shown in Fig. 8, once the fuse 111 is blown, the tension of the holding wire 112 is lost. By the force of the spring 115, the alarm contact 114 is separated from the conductor E2, and the conductors E1, E2 become unconnected. Therefore, in a state where the fuse 111 is blown, the alarm fuse 110 allows the current to not flow to the main system.

Further, once the fuse 111 is blown, as shown in FIG. 8, the blocking mechanism 113 jumps out of the alarm fuse 110. The obstruction mechanism 113 hinders the lowering of the slider 121 that is interlocked with the switch SW1. Therefore, in the melting In the state in which the wire 111 is blown, the alarm fuse 110 not only does not allow current to flow to the main system, but also locks the switch SW1 in the off state.

The DC circuit 100 shown so far has a configuration in which a MOSFET and a capacitor are combined in order to suppress the occurrence of arc discharge. The configuration for suppressing the occurrence of arc discharge is not limited to the above example. In the following description, in order to suppress the occurrence of arc discharge, an alarm fuse is provided in a DC circuit having a configuration in which a mechanical relay is connected in parallel to a solid state relay (SSR, semiconductor relay).

Fig. 9 is an explanatory view showing another configuration example of the DC circuit according to the embodiment of the present invention. In the case of a solid state relay (SSR, semiconductor relay) combined with a mechanical relay, the configuration of the DC circuit 100 for switching the supply and disconnection of DC power by turning on and off the mechanical relay is shown in FIG. .

The DC circuit 100 shown in FIG. 9 includes an SSR 130, a mechanical relay RY1, diodes D11, D12, and D13, capacitors C11 and C12, and a resistor R11. The DC circuit 100 is a current flowing between a main system and a sub-system in parallel on a path through which a direct current flows. The system in which the SSR 130 is set is the main system, and the system in which the mechanical relay RY1 is set is the sub system.

The mechanical relay RY1 operates by switching the contact using the electromagnetic force generated by the current flowing from the terminal V+ to the terminal V-. The mechanical relay RY1 is connected to the contact 1b when there is no current flowing from the terminal V+ to the terminal V-, and when there is current flowing from the terminal V+ to the terminal V- It is connected to the contact 1a by electromagnetic force. Further, although not shown in FIG. 9, a DC power supply for supplying DC power to the terminal V+ may be provided in the same manner as in FIGS. 1 and 2.

The SSR 130 is provided on the power supply path from the terminal A to the terminal B. In the present embodiment, the SSR 130 is configured to be in an on state when a voltage of a high state is applied to the control terminal, and to be in an off state when a voltage of a low state is applied to the control terminal.

When there is no current flowing from the terminal V+ to the terminal V-, no current flows in the mechanical relay RY1, so the mechanical relay RY1 is connected to the contact 1b. Therefore, the contact 1b of the mechanical relay RY1 is in a closed state, and the contact 1a is in an open state.

Thereafter, when a voltage is applied to the terminal V+ and a current flows from the terminal V+ to the terminal V-, the mechanical relay RY1 gradually generates an electromagnetic force. When the electromagnetic force generated by the mechanical relay RY1 reaches a certain level, the mechanical relay RY1 releases the connection with the contact 1b.

Then, if the electromagnetic force continues to rise, the mechanical relay RY1 is connected to the contact 1a, but chattering occurs when the connection is made to the contact 1a. When a voltage is applied to the terminal V+, the voltage is applied to the control terminal of the SSR 130, and the SSR 130 is turned on. Then, once current flows from the terminal V+ to the terminal V-, the electric charge is accumulated in the capacitor C1 through the diode D1.

Then, once no voltage is applied to terminal V+, no current flows from terminal V+ to terminal V-, then mechanical relay RY1 will Gradually reduce the electromagnetic force. When the electromagnetic force generated by the mechanical relay RY1 starts to decrease, the mechanical relay RY1 releases the connection with the contact 1a. Then, if the electromagnetic force continues to decrease, the mechanical relay RY1 is connected to the contact 1b, but chattering occurs when the connection to the contact 1b occurs.

At this time, the capacitor C11 is preferably accumulated before the mechanical relay RY1 is connected to the contact 1b, so that the electric power of the SSR 130 is set to be in an on state. At this time, the diode D12 is released from the reverse bias and is turned on, and the capacitor C12 is operated by the coil of the mechanical relay RY1.

That is, the capacitor C12 absorbs the chattering when the mechanical relay RY1 is connected to the contact 1b. Further, the capacitor C12 also forms a discharge circuit of the capacitor C11 through the diode D13 while absorbing the surge of the mechanical relay RY1.

Therefore, the DC circuit 100 shown in FIG. 9 does not have a current flowing from the terminal V+ to the terminal V-, and even if the mechanical relay RY1 is released from the connection with the contact 1a, the generation of an arc can be suppressed, and the surge can be absorbed. Further, in the DC circuit 100 shown in FIG. 9, the number of terminals is four, and the same connection as the general relay can be used, so that it can be replaced from the existing relay.

The DC circuit 100 shown in FIG. 9 is provided with an alarm fuse 110. When the semiconductor switch of the SSR 130 fails and cannot normally enter the off state, any of the alarm fuses 110 is blown by the current flowing from the terminal A. Once the alarm fuse 110 is blown, the switch of the alarm fuse 110 on the path of the contact 1a side of the mechanical relay RY1 becomes Disconnected state.

Once the switch of the alarm fuse 110 is turned off in the path of the contact 1a side of the mechanical relay RY1, the current system does not pass from the terminal A to the terminal B even if the mechanical relay RY1 is connected to the contact 1a side. flow. Therefore, the DC circuit 100 shown in FIG. 9 can prevent the re-energization by the mechanical relay RY1 even if the semiconductor switch of the SSR 130 fails or the like cannot normally enter the OFF state.

Fig. 10 is an explanatory view showing another configuration example of the DC circuit according to the embodiment of the present invention. FIG. 10 is a configuration example of the DC circuit 100 for switching the supply and disconnection of DC power by the ON/OFF of the mechanical relay, in the SSR combined mechanical relay. Further, although not shown in FIG. 10, a DC power supply for supplying DC power to the terminal V+ may be provided in the same manner as in FIGS. 1 and 2.

The DC circuit 100 shown in FIG. 10 is provided with the alarm fuse 110 in the same manner as the DC circuit 100 shown in FIG. 9. However, the alarm fuse 110 of FIG. 10 is not normally turned off when the semiconductor switch of the SSR 130 fails. Then, the switch provided on the path from the terminal V+ to the terminal V- is turned off. Therefore, the DC circuit 100 shown in FIG. 10 can prevent the re-energization by the mechanical relay RY1 even if the semiconductor switch of the SSR 130 fails or the like cannot normally enter the OFF state.

In the DC circuit 100 shown in Fig. 10, the mechanical relay RY1 does not operate once the alarm fuse 110 is blown. The DC circuit 100 shown in FIG. 10 causes the mechanical relay RY1 not to occur when an abnormality occurs. Action, so you can expect to find the effect of the fault more easily.

Fig. 11 is an explanatory view showing another configuration example of the DC circuit according to the embodiment of the present invention. FIG. 11 is a configuration example of the DC circuit 100 for switching the supply and disconnection of DC power by the ON/OFF of the mechanical relay in the SSR combined mechanical relay. Further, although not shown in Fig. 11, a DC power supply for supplying DC power to the terminal A may be provided in the same manner as in Figs. 1 and 2 .

Fig. 11 is a view showing a fuse 110' disposed between the terminal A and the SSR 130, and a DC circuit 100 having a configuration in which a power source for driving the mechanical relay RY1 is supplied between the fuse 110' and the SSR 130.

In the DC circuit 100 shown in Fig. 11, when the semiconductor switch of the SSR 130 fails and cannot be normally turned off, any of the fuses 110' is blown by the current flowing from the terminal A. When the fuse 110' is blown, no current flows to the mechanical relay RY1, and the mechanical relay RY1 does not operate. In the DC circuit 100 shown in FIG. 11, when the abnormality occurs, the mechanical relay RY1 does not operate, and it is expected that the effect of the failure can be easily found.

Fig. 12 is an explanatory diagram showing an example of temporal changes in current flowing through the fuse in the DC circuit 100 shown in Figs. 9 to 11 . 12 is a diagram showing the time change of the current I3 flowing through the fuse in the normal state and the time change of the current I4 flowing in the fuse 110 in the abnormal state of the DC circuit 100.

When the semiconductor switch of the SSR 130 operates normally, as shown in FIG. 12, a pulsed current I3 flows through the fuse. However, because When the SSR130 has a semiconductor switch failure or the like and does not operate normally, the current I4 as shown in FIG. 12 flows, and finally 110 is blown and the current I4 is lowered.

FIG. 13 is an explanatory diagram showing an example of the functional configuration of the moving body 40 including the DC circuit 100. The mobile body 40 can be, for example, a gasoline-powered mobile body such as a gasoline vehicle, or an electric vehicle, a hybrid electric vehicle, an electric motorcycle trailer, etc., and can be moved by a rechargeable battery as a main power source. body. FIG. 13 shows an example in which the mobile unit 40 includes a battery 210 and a drive unit 220 that is driven by electric power supplied from the battery. The drive unit 220 is included in, for example, a wiper, a power window, a vehicle lamp, a driving navigation system, an equipment provided in a vehicle such as an air conditioner, or a device for driving the movable body 40 such as a motor.

Then, in the moving body 40 shown in FIG. 13, the DC circuit 100 is provided in the middle of the path for supplying DC power from the battery 210 to the drive unit 220. The moving body 40 shown in FIG. 13 can suppress the occurrence of arc discharge by providing the DC circuit 100, for example, when the battery 210 is temporarily mounted, on the path of supplying the DC power from the battery 210 to the driving unit 220.

In addition, although FIG. 13 shows an example in which the DC circuit 100 is provided with only one moving body 40, the present disclosure is not limited to the above example. That is, the DC circuit 100 is in the middle of the DC power supply path and can be provided in plural. Further, the DC circuit 100 may be provided not only in the path of supplying the DC power from the battery 210 to the driving unit 220, but also in other places, for example, by setting the battery 210 to DC power. On the way to the path of charging. The mobile unit 40 can safely charge the battery 210 with DC power by providing the DC circuit 100 while the battery 210 is being charged with DC power.

<2. Summary>

As described above, according to the embodiment of the present invention, it is possible to provide a small-scale configuration without reducing the power efficiency at the time of DC power supply by suppressing the voltage generated between the electrodes when the DC power is cut. The DC circuit 100 for suppressing the occurrence of arc discharge at the time of cutting off the DC power.

In the DC circuit 100 according to the embodiment of the present invention, the semiconductor switch is used to suppress the occurrence of arc discharge during the interruption of the DC power. However, when the semiconductor switch fails, the fuse is broken, and the re-energization mechanism is prevented. Set the fuse of the mechanism with this. According to the configuration described above, the DC circuit 100 according to the embodiment of the present disclosure or the DC power supply device including the DC circuit 100 is used when the semiconductor switch is used for suppressing the arc discharge, even when the semiconductor switch is deteriorated. A short circuit can still ensure safety.

Although the preferred embodiment of the present disclosure has been described in detail above with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to the examples. As long as it is a person having ordinary knowledge in the technical field of the present disclosure, various modifications and modifications can be conceived within the scope of the technical idea described in the patent application, and these are of course also within the technical scope of the present disclosure.

Further, the effects described in the present specification are merely illustrative or exemplified, and are not limited. That is, the technique described in the present disclosure can achieve other effects that are self-evident to the practitioner according to the description of the present specification, together with the above-mentioned effects or the above-mentioned effects.

Further, the following configurations are also within the technical scope of the present disclosure.

(1)

A DC circuit includes: a first current path and a second current path which are provided in parallel in a path through which a direct current flows; and a circuit that uses a semiconductor switch provided in a first current path beforehand The generation of the arc is suppressed during the DC blocking in the second current path; at least the fuse is provided in the first current path; and the supply of the DC due to the second current path is stopped when the pre-fuse is blown; It has a rating that does not blow under the rated energization time of the pre-recorded circuit and the rated energizing current.

(2)

The DC circuit according to the above (1), wherein the second current path includes a mechanical switch that switches the supply and the blocking of the direct current due to the second current path, and includes a blocking mechanism. Once the pre-fuse fuse is blown, it prevents the pre-record Supply of DC power due to mechanical switches.

(3)

The DC circuit according to (1) or (2) above, wherein the pre-recording circuit is a circuit that suppresses the amount of direct current passing through the first current path.

(4)

The DC circuit according to the above (3), wherein the pre-recording circuit includes a switching element that is provided in a first current path, and is turned on when no DC is supplied in the second current path. The current flowing to the source side is reduced; and the capacitive element starts charging when no direct current is supplied in the first current path, and after the second current path is not supplied with DC, the switching element is provided. The gate voltage rises; and the resistive element is set with the pre-recorded capacitive element to apply a voltage to the gate terminal of the preceding switching element.

(5)

The DC output circuit according to the above (1), wherein the pre-recording circuit includes a semiconductor relay that is provided in a first current path, and switches supply and interruption of a direct current from a DC power source; and a mechanical relay The second current path is provided in the second current path, and is connected in parallel with the pre-recorded semiconductor relay to switch the supply and the blocking of the direct current from the pre-recorded DC power supply; It is a circuit for suppressing the chattering of the mechanical relay when the DC of the mechanical relay is interrupted.

(6)

A DC circuit as described in (5) above, wherein the pre-recording circuit further includes a capacitor connected in parallel with the mechanical relay of the pre-recording, and one end is a control terminal connected to the pre-recorded semiconductor relay; the pre-recorded semiconductor relay is in the pre-recording machine The relay is turned on by applying a high state voltage to the pre-recorded control terminal before switching from the off state to the on state; after the mechanical relay is switched from the on state to the off state, the preamplifier control terminal is applied The low-state voltage is turned off; the pre-recorded capacitor is stored while the mechanical relay is turned on, and the output is used to keep the pre-recorded semiconductor relay turned on after the mechanical relay is switched to the off state. The current required.

(7)

A DC power supply device includes: a DC power supply that supplies DC power; and a first current path and a second current path that are connected in parallel in a path through which DC flows; and a circuit that is used in the pre-record The semiconductor switch on the first current path suppresses the arc during the DC blocking in the second current path. In the first current path, at least the fuse is provided; once the fuse is blown, the supply of DC due to the second current path is stopped; the pre-fuse has the rated energization time of the pre-recorded circuit and the rated energization. Rated without breaking current.

(8)

The DC power supply device according to the above (7), wherein the second current path includes a mechanical switch that switches the supply and the blocking of the direct current due to the second current path, and includes: a blocking mechanism When the fuse is blown, the supply of DC power caused by the mechanical switch is prevented.

(9)

The DC power supply device according to the above (7) or (8), wherein the pre-recording circuit is a circuit that suppresses the amount of direct current passing through the first current path.

(10)

The DC power supply device according to the above (9), wherein the pre-recording circuit includes a switching element that is provided in the first current path, and is turned on when no DC is supplied in the second current path. In the state, the current flowing to the source side is reduced; and the capacitive element is charged when the DC current is not supplied in the first current path, and no DC is supplied in the second current path. After the application, the gate voltage of the switching element is increased; and the resistance element is set together with the pre-capacitor element to apply a voltage to the gate terminal of the switching element.

(11)

The DC power supply device according to the above (7), wherein the pre-recording circuit includes a semiconductor relay that is provided in a first current path, and switches supply and interruption of DC power; and a mechanical relay is used. The second current path is provided in advance, and is connected in parallel with the pre-recorded semiconductor relay to switch the supply and the disconnection of the power from the pre-recorded power supply. When the DC blocking by the mechanical relay is interrupted, the mechanism is suppressed. The circuit of the tremor of the relay.

(12)

The DC power supply device according to (11), wherein the pre-recording circuit further includes a capacitor connected in parallel with the pre-recorded mechanical relay, and one end is connected to a control terminal of the pre-recorded semiconductor relay; Before the mechanical relay is switched from the off state to the on state, it is turned on by applying a high state voltage to the pre-recorded control terminal; after the mechanical relay is switched from the on state to the off state, the pre-recording control is performed. The terminal is turned into a disconnected state by applying a low-state voltage; the pre-recorded capacitor is in a state in which the mechanical relay is turned on. During the period of power storage, after the mechanical relay is switched to the off state, the power required to maintain the pre-recorded semiconductor relay in the on state is output.

(13)

A mobile body comprising the DC circuit as described in any one of (1) to (6) above.

(14)

A power supply system includes: a battery that supplies DC power; and a drive unit that is driven by DC power supplied from a front battery; and at least one that is provided between the front battery and the front drive unit A DC circuit as described in any one of (1) to (6) above.

10‧‧‧ load

100‧‧‧DC circuit

110‧‧‧Alarm fuse

200‧‧‧DC power supply

C1‧‧‧ capacitor

D1‧‧‧ diode

R1‧‧‧ resistance

SW1‧‧‧ switch

T1‧‧‧MOSFET

Claims (14)

A DC circuit includes: a first current path and a second current path which are provided in parallel in a path through which a direct current flows; and a circuit in which a semiconductor switch provided in a first current path is used in a pre-record (2) suppressing the occurrence of arc during DC blocking in the current path; at least the fuse is provided in the first current path; and the supply of DC due to the second current path is stopped once the fuse is blown; It has a rating that will not be blown under the rated energization time and rated current of the pre-recorded circuit. The DC circuit according to claim 1, wherein the second current path has a mechanical switch that switches the supply and the blocking of the direct current due to the second current path; and includes: a blocking mechanism The pre-fuse fuse is blown to prevent the supply of DC power from the mechanical switch. The DC circuit according to claim 1, wherein the pre-recording circuit is a circuit that suppresses the amount of direct current passing through the first current path. The DC circuit according to claim 3, wherein the pre-recording circuit includes a switching element that is provided in a first current path, and is turned on when no DC is supplied in the second current path. The current flowing to the source side is reduced; and the capacitive element starts charging when no direct current is supplied in the first current path, and after the second current path is not supplied with DC, the switching element is provided. The gate voltage rises; and the resistive element is set with the pre-recorded capacitive element to apply a voltage to the gate terminal of the preceding switching element. The DC circuit according to claim 1, wherein the pre-recording circuit includes a semiconductor relay that is provided in a first current path, and switches supply and interruption of a direct current from a DC power source; and a mechanical relay It is provided in the second current path, and is connected in parallel with the pre-recorded semiconductor relay to switch the supply and the blocking of the direct current from the pre-recorded DC power supply; and when the DC blocking by the mechanical relay is interrupted, A circuit that suppresses chattering of the mechanical relay. The DC circuit according to claim 5, wherein the pre-recording circuit further includes a capacitor connected in parallel with the pre-recorded mechanical relay, and one end is a control terminal connected to the pre-recorded semiconductor relay; and the pre-recorded semiconductor relay is in the pre-recorded mechanical type Before the relay is switched from the off state to the on state, the state is turned on by applying a high state voltage to the preamplifier control terminal; after the mechanical relay is switched from the on state to the off state, the preamplifier control terminal is applied low. The voltage of the state becomes the disconnected state; The pre-recorded capacitor stores power during a period in which the mechanical relay is turned on, and outputs a current required to maintain the pre-recorded semiconductor relay in an on state after the mechanical relay is switched to the off state. A DC power supply device includes: a DC power supply that supplies power due to a direct current; and a first current path and a second current path that are connected in parallel in a path through which a direct current flows; and a circuit that is used in use The semiconductor switch on the first current path is preceded by the occurrence of arc during the DC blocking in the second current path; the first current path is provided with at least a fuse; and when the previous fuse is blown, the pre-record is stopped. 2 DC supply due to the current path; the pre-fuse fuse has a rating that does not blow under the rated energization time of the pre-recorded circuit and the rated energization current. The DC power supply device according to claim 7, wherein the second current path includes a mechanical switch that switches the supply and the blocking of the direct current due to the second current path, and includes a blocking mechanism. Once the fuse is blown, the supply of DC due to the mechanical switch is prevented. The DC power supply device according to claim 7, wherein the pre-recording circuit is configured to suppress the amount of direct current passing through the first current path. road. The DC power supply device according to claim 9, wherein the pre-recording circuit includes a switching element that is provided in a first current path, and that is turned on when no DC is supplied in the second current path. And the current flowing to the source side is reduced; and the capacitive element starts charging when no direct current is supplied in the first current path, and the first switching element is not supplied after the second current path is supplied. The gate voltage rises; and the resistive element is set with the pre-recorded capacitive element to apply a voltage to the gate terminal of the preceding switching element. The DC power supply device according to claim 7, wherein the pre-recording circuit includes: a semiconductor relay that is provided in a first current path, switches between supply and disconnection of DC from a DC power source; and a mechanical relay The second current path is provided in the second current path, and is connected in parallel with the pre-recorded semiconductor relay to switch the supply and the off-state of the DC from the pre-recorded DC power supply; and is: when the DC of the mechanical relay is interrupted. a circuit that suppresses chattering of the mechanical relay. The DC power supply device according to claim 11, wherein the pre-recording circuit further includes a capacitor connected in parallel with the pre-recorded mechanical relay, and one end is a control terminal connected to the pre-recording semiconductor relay; The pre-recorded semiconductor relay is turned on by applying a high-state voltage to the pre-recorded control terminal before the mechanical relay is switched from the off state to the on-state state; after the mechanical relay is switched from the on state to the off state The low-state voltage is applied to the pre-recorded control terminal to be turned off. The pre-recorded capacitor is stored while the mechanical relay is turned on, and the mechanical relay is switched to the off state. The power required to maintain the pre-recorded semiconductor relay in an on state. A mobile body comprising the DC circuit as recited in claim 1. A power supply system includes: a battery that supplies DC power; and a drive unit that is driven by DC power supplied from a front battery; and at least one that is provided between the front battery and the front drive unit The DC circuit as recited in claim 1.