JP5908383B2 - Electric vehicle control device - Google Patents

Description

  Embodiments described herein relate generally to an electric vehicle control apparatus.

The electric vehicle control device mounted on the vehicle is connected to a pantograph or a third rail outside the vehicle via a high voltage wiring, and DC power is supplied to the electric vehicle control device. By replacing the pantograph or third rail, which is a power supply source, with a storage battery, the electric vehicle control device charges the filter capacitor and drives the main motor to run. The voltage charged in the filter capacitor can be discharged by opening the main switch.
In recent years, an electric vehicle control device having a storage battery has been proposed (see, for example, Patent Document 1), and is used as an electric power supply source during emergency traveling.

JP 2010-252524 A

  However, when the pantograph or the third rail is disconnected from the main circuit and traveled by receiving power supply from the storage battery (hereinafter simply referred to as storage battery travel), even if the first main switch for disconnecting the DC power supply is erroneously opened, In conjunction with the first main switch, the filter capacitor is charged from the storage battery by the presence of the second main switch that is closed when the first main switch is opened and connects the discharging resistor to the filter capacitor. In parallel, since the current continues to flow from the storage battery to the discharging resistor provided for discharging the stored power of the filter capacitor, there is a possibility that an overcurrent flows to the discharging resistor and causes a failure.

  Then, this invention aims at providing the control apparatus which can eliminate the malfunction resulting from the erroneous opening of a main switch at the time of storage battery driving | running | working.

  An electric vehicle control apparatus according to an embodiment includes a storage battery that stores DC power from a DC power supply and a filter capacitor, and is supplied with either DC power from the DC power supply or DC power from the storage battery. The AC component is removed by a filter capacitor when supplying the load to the load.

The discharge resistor is connected in parallel with the filter capacitor and discharges the stored power of the filter capacitor.
The first main switch is opened to disconnect the DC power supply from the filter capacitor, and the second main switch operates exclusively with the first main switch in conjunction with the first main switch. When the switch is open, the switch is closed and the discharge resistor is grounded to discharge the stored power of the filter capacitor.
Along with these, the determination means of the control unit, when the supply to the load of the DC power from the battery, based on the difference between the voltage of the voltage and the filter capacitor of the DC power supply, the first main switch open state Ah is, the second main switch in conjunction with the first main switch that has become a closed state, to determine whether in the open state erroneous main switch.

FIG. 1 is a schematic configuration diagram of the first embodiment. FIG. 2 is a schematic configuration block diagram of the voltage value comparison unit. FIG. 3 is an operation timing chart of the voltage value comparison unit at the normal time. FIG. 4 is an operation timing chart of the voltage value comparison unit when the main switch is erroneously opened. FIG. 5 is a schematic configuration block diagram of the second embodiment. FIG. 6 is a schematic configuration block diagram of the third embodiment. FIG. 7 is a schematic configuration block diagram of the fourth embodiment. FIG. 8 is a schematic configuration block diagram of the fifth embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
[1] First Embodiment First, a first embodiment will be described.
FIG. 1 is a schematic configuration diagram of the first embodiment.
The DC electric vehicle control device 10 of the first embodiment is configured as a battery control device for a DC electric vehicle mounted on the DC electric vehicle.

As shown in FIG. 1, the DC electric vehicle control device 10 is connected to a DC power supply 100 having a feeder (not shown) via a current collector (eg, a pantograph), a wheel (not shown), and A power converter 110 connected to the main ground 113 via a rail (or a third rail), a main electric motor (main motor) 114 that receives power supplied from the power converter 110 and drives a DC electric vehicle control device, It has.
Further, the power conversion device 110 forms a filter in cooperation with the first main switch 101, the circuit breaker 102, the contactor (contactor) 104, and a filter capacitor described later, which form an interlocked main switch from the DC power supply 100. DC power is supplied through the filter reactor 107.

  Further, between the output terminal of the circuit breaker 102 and the main ground 113, a DC power supply 100 or a power supply voltage detector 103 for detecting the voltage of a storage battery 112 (to be described later) when the storage battery is running is connected. Between the connection point to the main ground 113, a discharging resistor 105 and a second main switch 106 constituting an interlocking main switch are inserted in series. When the first main switch 101 is opened during maintenance or the like, the discharging resistor 105 is linked with the first main switch 101 and the second main switch 106 is closed so that the filter capacitor 109 The stored power is discharged (discharged) to the main ground 113 to ensure the safety of the maintenance worker.

Further, a filter capacitor voltage detector 108 and a filter capacitor 109 are connected in parallel between the connection point of the filter reactor 107 and the power converter 110 and the main ground 113.
Further, a storage battery charging / discharging circuit 111 and a storage battery 112 are connected in series between a connection point between the contactor 104 and the filter reactor 107 and the main ground 113.

In the above configuration, the first main switch 101 and the second main switch 106 are exclusively turned on (closed state) / off (open state) and manually switched by a maintenance worker or the like prior to work. It is configured as a manual changeover switch.
Then, the power supply voltage detector 103 that has detected the power supply voltage SV that is the voltage of the DC power supply 100 outputs the power supply voltage detection signal SSV to the control unit 120, and the filter that has detected the filter capacitor voltage SC that is the voltage of the filter capacitor 109. The capacitor voltage detector 108 outputs a filter capacitor voltage detection signal SSC to the control unit 120. Further, the contactor 104 outputs a contactor answer SCA indicating the state of the contactor 104 to the control unit 120. In the following description, it is assumed that the contactor answer SCA is at the “H” level when the contactor 104 is in the ON state.

  As a result, the power supply voltage SV, the filter capacitor voltage SC, and the contactor answer SCA are input to the voltage value comparison unit 121 of the control unit 120. Based on these, the voltage value comparison unit 121 erroneously opens the main switch. Thus, the main switch erroneous opening signal MSER indicating whether or not it has been performed is output.

Here, a schematic configuration of the voltage value comparison unit 121 will be described.
FIG. 2 is a schematic configuration block diagram of the voltage value comparison unit.
The voltage value comparison unit 121 receives the filter capacitor voltage SC and the power supply voltage SV that is the voltage of the DC power supply 100, and subtracts the power supply voltage SV from the filter capacitor voltage SC to calculate a difference voltage ΔV. A comparison circuit (comparator) 132 that compares the voltage ΔV with a predetermined (voltage) value α, compares the difference voltage ΔV with a predetermined value α (ΔV ≧ α), and outputs a comparison result SCP. And.

  Further, the voltage value comparison unit 121 inverts the signal logic of the contactor answer SCA (“H” level when the contactor 104 is closed) and outputs it as an inverted contactor answer / SCA, and an inverted contactor answer. / SCA “H” level transition (contactor 104 transitions to an open state) is delayed by a predetermined time td and delay-inverted contactor answer / SCAD is output, delay-inverted contactor answer / SCAD, An AND circuit 135 that calculates the logical product of the comparison result SCP and outputs a main switch erroneous release trigger signal MSERT.

The voltage value comparison unit 121 includes an RS flip-flop circuit 136 that outputs a main switch error release signal MSER at an “H” level when a “H” level main switch error release trigger signal MSERT is input, and a delay inversion contactor. The NOT circuit 137 that inverts the signal logic of the answer / SCAD and outputs it as a delayed contactor answer SCAD and the logical product of the inverted contactor answer / SCA and the delayed contactor answer SCAD are taken to determine whether the main switch is erroneously opened And an AND circuit 138 for setting the switch misopening determination signal MSC to the “H” level.
In the above configuration, the RS flip-flop circuit 136 is reset by inputting an “L” level reset signal.

Next, the operation of the voltage value comparison unit 121 will be described.
First, the operation in the normal state, that is, when the main switch is not opened accidentally will be described.
FIG. 3 is an operation timing chart of the voltage value comparison unit at the normal time.
Assuming that the driving operator switches to running of the storage battery at time t1, power is supplied from the storage battery 112 to the power conversion device 110 and the main motor 114, which are loads, via the storage battery charging / discharging circuit 111. It is in an off state (open state).

After the circuit breaker 102 is turned off, the contactor 104 is turned on, the contactor answer SCA becomes “L” level, and the inverted contactor answer / SCA becomes “H” level.
The on-delay circuit 134 delays the "H" level transition of the inverting contactor answer / SCA by a predetermined time td and outputs the "H" level delayed inverting contactor answer / SCAD at time t2.

  As a result, the storage battery charging / discharging circuit 111 shifts to the discharge mode and starts charging the filter capacitor 109 with the storage battery 112. As a result, as shown in FIG. 3, the filter capacitor voltage SC representing the voltage of the filter capacitor 109 gradually increases and becomes substantially constant at time t3. At time t3, when the contactor 104 is closed, the contactor answer SCA becomes “H” level, and the inverted contactor answer / SCA becomes “L” level again as in the initial state.

At time t3, the main switch erroneous open determination is in progress. However, when the first main switch 101 constituting the main switch is not erroneously opened and is in the closed state, the filter capacitor voltage SC does not change. . That is, since the main switch is erroneously opened, that is, the first main switch 101 is in the closed state, the discharge path of the filter capacitor 109 is not formed, and the filter capacitor voltage SC that is the voltage of the filter capacitor 109 is maintained. State, there is no difference with the power supply voltage,
ΔV = SV−SC <α
Thus, the main switch erroneous opening detection signal MSER maintains the “L” level corresponding to the normal case.

The above operation will be described in more detail.
The subtracter 131 of the voltage value comparison unit 121 receives the filter capacitor voltage SC and the power supply voltage SV that is the voltage of the DC power supply 100, and calculates the difference voltage ΔV by subtracting the power supply voltage SV from the filter capacitor voltage SC. Output to the comparison circuit 132.
Thereby, the comparison circuit 132 compares the difference voltage ΔV output from the subtractor 131 with the predetermined (voltage) value α, and compares whether or not the difference voltage ΔV is equal to or larger than the predetermined value α (ΔV ≧ α). But in this case,
ΔV = SV−SC <α
Therefore, the “L” level comparison result SCP is output to the AND circuit 135.

On the other hand, the NOT circuit 133 receives the contactor answer SCA, and inverts the signal logic of the contactor answer SCA (“H” level when the contactor 104 is closed) to reverse the contactor answer / SCA as an on-delay circuit. It outputs to 134.
The on-delay circuit 134 delays the “H” level transition of the inverting contactor answer / SCA (the contactor 104 transitions to the open state) by a predetermined time td, and outputs it to the AND circuit 135 as a delayed inverting contactor answer / SCAD. .

  As a result, the AND circuit 135 takes the logical product of the delayed inversion contactor answer / SCAD and the comparison result SCP. In this case, since the comparison result SCP is at the “L” level, the AND circuit 135 has the “L” level. The main switch erroneous release trigger signal MSERT is output to the set terminal S of the RS flip-flop circuit 136.

Thus, the RS flip-flop circuit 136 outputs the “L” level main switch erroneous opening signal MSER corresponding to the normal state.
The NOT circuit 137 inverts the signal logic of the delayed inversion contactor answer / SCAD and outputs the inverted signal to the AND circuit 138 as the delayed contactor answer SCAD.
As a result, the AND circuit 138 calculates the logical product of the inverted contactor answer / SCA and the delayed contactor answer SCAD during the period from the time t13 to the time t14, and outputs the main switch error open determination signal MSC during the main switch error open determination. Set to “H” level.

Next, the operation when an abnormality occurs, that is, when the main switch is erroneously opened will be described.
FIG. 4 is an operation timing chart of the voltage value comparison unit when the main switch is erroneously opened.
If the driving operator switches to battery running at time t11, the circuit breaker 102 is turned off (opened). As a result, the contactor 104 is also opened at time t1, the contactor answer SCA is set to the “L” level, and the inverted contactor answer / SCA is set to the “H” level.
Then, the on-delay circuit 134 outputs the "H" level delayed inversion contactor answer / SCAD at time t2 when the "H" level transition of the inversion contactor answer / SCA is delayed by a predetermined time td.

As a result, the storage battery charging / discharging circuit 111 shifts to the discharge mode and starts charging the filter capacitor 109 with the storage battery 112. As a result, as shown in FIG. 4, the filter capacitor voltage SC representing the voltage of the filter capacitor 109 gradually increases and becomes substantially constant at time t13.
At time t13, when the contactor 104 is closed, the contactor answer SCA becomes “H” level, and the inverted contactor answer / SCA becomes “L” level again as in the initial state.

  As a result, the main switch erroneous open determination is being performed at time t13, but when the first main switch 101 constituting the interlocked main switch is erroneously opened and is in the open state, the first main switch 101 With the open state, the second main switch 106 in the closed state is in the closed state, and the power of the filter capacitor 109 is discharged through the discharging resistor 105 and the second main switch 106, and the filter capacitor voltage SC decreases.

As a result, the filter capacitor voltage SC, which is the voltage of the filter capacitor 109, decreases, so that a difference from the power supply voltage SV occurs.
SV-SC ≧ α
Thus, the main switch erroneous opening detection signal MSER shifts to the “H” level corresponding to the abnormal main switch erroneous opening state.

The above operation will be described in more detail.
The subtracter 131 of the voltage value comparison unit 121 receives the filter capacitor voltage SC and the power supply voltage SV that is the voltage of the DC power supply 100, and calculates the difference voltage ΔV by subtracting the power supply voltage SV from the filter capacitor voltage SC. Output to the comparison circuit 132.

Thereby, the comparison circuit 132 compares the difference voltage ΔV output from the subtractor 131 with the predetermined (voltage) value α, and compares whether or not the difference voltage ΔV is equal to or larger than the predetermined value α (ΔV ≧ α). But in this case,
ΔV = SV−SC ≧ α
Therefore, the “H” level comparison result SCP is output to the AND circuit 135.

On the other hand, the NOT circuit 133 receives the contactor answer SCA, and inverts the signal logic of the contactor answer SCA (“H” level when the contactor 104 is closed) to reverse the contactor answer / SCA as an on-delay circuit. It outputs to 134.
The on-delay circuit 134 delays the “H” level transition of the inverting contactor answer / SCA (the contactor 104 transitions to the open state) by a predetermined time td, and outputs it to the AND circuit 135 as a delayed inverting contactor answer / SCAD. .

  As a result, the AND circuit 135 takes the logical product of the delayed inversion contactor answer / SCAD and the comparison result SCP. In this case, the delay inversion contactor answer / SCAD and the comparison result SCP are both “H”. Since it is “level”, the main switch erroneous release trigger signal MSERT of “H” level is output to the set terminal S of the RS flip-flop circuit 136.

As a result, the RS flip-flop circuit 136 outputs the “H” level main switch erroneous opening signal MSER corresponding to the abnormality.
The NOT circuit 137 inverts the signal logic of the delayed inversion contactor answer / SCAD and outputs the inverted signal to the AND circuit 138 as the delayed contactor answer SCAD.
As a result, the AND circuit 138 calculates the logical product of the inverted contactor answer / SCA and the delayed contactor answer SCAD during the period from the time t13 to the time t14, and outputs the main switch error open determination signal MSC during the main switch error open determination. Set to “H” level.

  Therefore, according to the first embodiment, since the main switch erroneous opening can be detected based on the main switch erroneous opening detection signal MSER, the discharge resistor 105 is prevented from being burned out by the filter capacitor voltage SC. be able to. Further, since the erroneous opening of the main switch 101 can be reliably detected only by the state of the power supply voltage SV and the filter capacitor voltage SC, it is not necessary to newly add a contactor or the like for detecting the erroneous opening of the main switch 101. The apparatus configuration can be simplified.

[2] Second Embodiment In the first embodiment described above, the configuration for outputting the main switch erroneous opening signal MSER has been described. However, in the second embodiment, the main switch erroneous opening signal MSER is used. The primary child form will be described.
FIG. 5 is a schematic configuration block diagram of the second embodiment.
In FIG. 5, the same parts as those in FIG.
5 differs from FIG. 1 in that the main switch erroneous opening signal MSER and the main switch erroneous opening determination in-progress signal MSC are output to the electric vehicle cab 200. FIG.

  According to the configuration of the second embodiment, an indicator is provided on the electric vehicle driver's cab 200 side, or the main switch erroneous opening signal MSER and the main switch erroneous opening determination signal MSC are displayed on the display of the electric vehicle driver's cab 200. By displaying the fact that the switch is being erroneously opened and displaying the result of the determination, it is possible to prevent accidental continuation of the storage battery while the first main switch 101 is open, and to prompt the main switch 101 to be turned on. By presenting, it becomes possible to prevent the discharge resistor 105 from being burned out.

  Therefore, according to the second embodiment, the state of the main switch 101 can be reliably and easily grasped in the electric vehicle cab 200 based on the main switch erroneous opening signal MSER and the main switch erroneous opening determining signal MSC. The main switch 101 can be quickly turned on to restore the state.

[3] Third Embodiment The second embodiment has a configuration in which only the situation is grasped in the electric vehicle cab 200. However, in the third embodiment, the operation command OP is received from the electric vehicle cab 200. Even when the main switch is erroneously opened, the storage battery charging / discharging circuit is configured so that the operation command OP is ignored and the main switch erroneous opening signal MSER of “H” level is output. 111 is prohibited from shifting to the discharge state, the contactor 104 is opened, and the power conversion operation of the power conversion device 110 is prohibited, thereby prohibiting the DC electric vehicle control device 10 from running the storage battery.

FIG. 6 is a schematic configuration block diagram of the third embodiment.
By the way, while the “H” level main switch erroneous opening determination in-progress signal MSC is being transmitted to the electric vehicle cab 200, it is necessary to prohibit the storage battery running of the DC electric vehicle control device 10.
Therefore, in the third embodiment, as shown in FIG. 6, during the period when the main switch erroneous opening determination signal MSC is “H” level, that is, during the main switch erroneous opening determination, the NOT circuit 141 An AND main switch erroneous opening determination signal / MSC obtained by inverting the signal level of the main switch erroneous opening determination signal MSC is inputted with an operation command OP (“H” level at the time of operation command) at one input terminal. By inputting the inverted main switch erroneous opening determination in-progress signal / MSC to the other input terminal of the circuit 142, the operation command OP is effectively held at "L" level, the contactor 104 is opened, and the power converter 110 is in a non-operating state, so that the DC electric vehicle control device 10 does not perform a storage battery operation, and eventually the discharge resistor 105 is destroyed by an overcurrent. That there is no.

  As described above, according to the third embodiment, during the main switch erroneous opening determination signal MSC during the period when the main switch erroneous opening determination in-progress signal MSC is “H” level, The operation command OP is not accepted, and the driver or the like can surely know that in the electric vehicle cab 200. In addition, since the main switch erroneous opening detection state is maintained, traveling of the DC electric vehicle control device 10 can be reliably prohibited until the main switch 101 is turned on.

[4] Fourth Embodiment In each of the above-described embodiments, the relationship between the filter capacitor voltage SC when the second main switch 106 is closed and the power supply voltage SV that is the voltage of the storage battery 112 is considered. However, if the filter capacitor 109 and the storage battery 112 are connected in a state where the filter capacitor voltage SC is higher than the power supply voltage SV that is the voltage of the storage battery 112, an inrush current flows from the filter capacitor 109 to the storage battery 112.
Therefore, the fourth embodiment is an embodiment for suppressing the inrush current to the storage battery 112 in consideration of such a state.

FIG. 7 is a schematic configuration block diagram of the fourth embodiment.
In FIG. 7, the same parts as those in FIG. 1 are denoted by the same reference numerals. However, in the configuration of the control unit 120C, the parts different from the control unit 120 of the first embodiment are easy to understand. Only shown.
By the way, as described above, when the filter capacitor 109 and the storage battery 112 are connected in a state where the filter capacitor voltage SC is higher than the power supply voltage SV that is the voltage of the storage battery 112, an inrush current flows from the filter capacitor 109 to the storage battery 112.

Therefore, in the fourth embodiment, the storage battery 112 and the filter capacitor 109 cause the overvoltage suppressor 401 to be closed (on state) and short-circuit the overvoltage suppressor 401 by the overvoltage suppressor input command OVS of the control unit 120C. Thus, the voltage of the filter capacitor 109 is discharged through the overvoltage suppression resistor 400, the overvoltage suppressor 401, and the main ground 113.
Then, after discharging, the contactor 104 is inserted to connect the filter capacitor 109 and the storage battery 112.

  That is, when power is supplied from the storage battery 112 to the power converter and the main motor 114 that are loads, the overvoltage suppressor 401 is closed before the storage battery 112 is connected to the filter capacitor 109, By discharging the electric power, failure and deterioration of the storage battery 112 due to the inrush current from the filter capacitor 109 can be prevented.

[5] Fifth Embodiment In the above embodiments, the storage battery 112 is connected to the discharging resistor 105 when the first main switch 101 is opened and the second main switch 106 is closed. Therefore, when the storage voltage of the storage battery 112 is higher than the voltage of the filter capacitor 109, not only can the filter capacitor 109 be discharged, but also an excessive discharge current is generated from the storage battery 112 to the discharging resistor 105. There was a risk of flowing.
Therefore, in the fifth embodiment, when the first main switch 101 is opened and the second main switch 106 is closed, the battery 112 is electrically disconnected to reliably discharge the filter capacitor 109. Switch 141 is provided.
Thus, according to the configuration of the fifth embodiment, the filter capacitor 109 can be reliably discharged even when the storage voltage of the storage battery 112 is higher than the voltage of the filter capacitor 109, and the discharge It is possible to reliably protect the resistor from overcurrent.

[6] Modification of Embodiment In the above description, the power supply voltage SV is subtracted from the filter capacitor voltage SC to calculate the difference voltage ΔV, and the difference voltage ΔV is compared with a predetermined (voltage) value α. The main switch erroneous opening is detected by comparing whether or not the difference voltage ΔV is greater than or equal to a predetermined value α (ΔV ≧ α). The filter capacitor voltage SCt at a certain time t is stored, and this filter capacitor is stored. It is also possible to compare the voltage SCt with the current filter capacitor voltage SCnow to detect erroneous opening of the main switch.

  In the above description, the state maintaining means such as the RS flip-flop for holding the main switch erroneous opening signal MSER is configured by hardware in order to maintain the main switch erroneous opening state, but is maintained by software logic. Such a configuration is also possible.

  Specifically, the electric vehicle control device of this embodiment includes a control device such as a CPU, a storage device such as a ROM (Read Only Memory) and a RAM, an external storage device such as an HDD and a CD drive device, and a display device. A display device such as a keyboard and an input device such as a mouse and a hardware configuration using a normal computer can be provided.

  In this case, the control program executed by the electric vehicle control apparatus of the present embodiment is a file in an installable format or an executable format, and is a CD-ROM, flexible disk (FD), CD-R, DVD (Digital Versatile). It is also possible to be provided by being recorded on a computer-readable recording medium such as a disk).

Moreover, you may comprise so that the control-program performed with the electric vehicle control apparatus of this embodiment may be provided by storing on a computer connected to networks, such as the internet, and downloading via a network. In addition, the program executed in the apparatus of the present embodiment may be provided or distributed via a network such as the Internet.
Moreover, you may comprise so that the control program of the electric vehicle control apparatus of this embodiment may be previously incorporated in ROM etc. and provided.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 DC electric vehicle control apparatus 100 DC power supply 101 1st main switch 102 Circuit breaker 103 Power supply voltage detector 104 Contactor 105 Discharge resistor 106 2nd main switch 107 Filter reactor 108 Filter capacitor voltage detector 109 Filter capacitor 110 Power conversion Device 111 Storage battery charge / discharge circuit 112 Storage battery 113 Main ground 114 Main motor 120, 120A to 120C Control unit 121 Voltage value comparison unit 131 Subtractor 132 Comparison circuit 133 NOT circuit 134 On-delay circuit 135 AND circuit 136 RS flip-flop circuit 137 NOT circuit 138 AND circuit 141 NOT circuit 142 AND circuit 200 Electric vehicle cab 400 Overvoltage suppression resistor 401 Overvoltage suppressor MSC Main switch erroneous open determination signal M SE Main switch error open signal MSE Main switch error open signal MSER Main switch error open signal MSER Main switch error open detection signal MSERT Main switch error open trigger signal OP Operation command OVS Overvoltage suppressor input command SC Filter capacitor voltage SCA Contactor answer SCAD Delay contactor answer SCP comparison result SSC filter capacitor voltage detection signal SSV power supply voltage detection signal SV power supply voltage td delay time ΔV differential voltage

Claims (7)

A storage battery for storing DC power from a DC power source;
When either DC power from the DC power source or DC power from the storage battery is supplied and supplied to a load constituting a DC electric vehicle, a filter capacitor for removing AC components;
Is connected in parallel with the previous SL filter capacitor, a discharge resistor for discharging stored power of the filter capacitor,
A first main switch that is opened to disconnect the DC power source from the filter capacitor;
Interlocked with the first main switch , operates exclusively with the first main switch, and closes when the first main switch is open to ground the discharge resistor to store the stored power of the filter capacitor. A second main switch for discharging
When the supply to the load of the DC power from the battery, based on the difference between the voltage and the voltage of the filter capacitor of the DC power supply, wherein Ri first main switch open state near the first main switch the second main switch in conjunction is that it the closed state, and a control unit having a judging means for judging whether or not in the open state erroneous main switch,
An electric vehicle control device comprising: The control unit outputs a main switch erroneous opening signal corresponding to the result of the determination;
The electric vehicle control device according to claim 1. The control unit outputs a main switch erroneous opening determination signal while determining whether or not the main switch is in an erroneous opening state.
The electric vehicle control device according to claim 1 or 2. Wherein, in a case where the operation command for instructing the supply to the DC power the load from the electric vehicle cab or found before Symbol battery is input, whether the main switch erroneous open If it is being determined, the processing is performed assuming that the operation command has not been input.
The electric vehicle control device according to claim 3. A storage battery charging / discharging circuit for charging and discharging the storage battery;
The control unit outputs a discharge stop command to the storage battery charging / discharging circuit and performs control to disconnect the storage battery when the determination unit determines that the main switch is in an erroneously opened state. The electric vehicle control device according to claim 4. When the control unit determines that the main switch is in an erroneously opened state by the determining unit, the control unit maintains a determined state in which the main switch is in an erroneously opened state until the first main switch is in a closed state.
The electric vehicle control device according to any one of claims 1 to 5. In parallel with the discharge resistor, it has an overvoltage suppression resistor and an overvoltage suppressor for discharging the stored power of the filter capacitor,
Prior to supplying DC power from the storage battery, the controller discharges the stored power of the filter capacitor via the overvoltage suppression resistor and the overvoltage suppressor.
The electric vehicle control device according to any one of claims 1 to 6.

Images