JP2011244661A - Safety mechanism in electric vehicle charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety mechanism which prevents electrical shock and electrical leakage and can inexpensively be manufactured with a simple structure in an electric vehicle charger.SOLUTION: When a main power supply switch 1 is turned on and is conducted, power is supplied to an output terminal 6 via a main wire M and at least voltage is detected in the main wire M by a voltage input terminal 31 of a disconnection detection device 3. When a current input terminal 32 detects that a current value in the main wire M is smaller than a previously set current value, a disconnection signal S is outputted indicating that an on-vehicle battery V is not conducted from the output terminal 6. The disconnection signal S is received by a timer relay device 4 and a conduction route is switched after prescribed time elapses so as to drive an electromagnetic open/close-type switch 2 to an OFF-side so that conduction to the main wire M is interrupted and an alarm state is displayed by an alarm device 5.

Description

  The present invention is an improvement of a charging device for an electric vehicle. More specifically, it can prevent electric shock and electric leakage to ensure electric safety of a user and prevent damage to equipment such as a connection plug. Further, the present invention relates to a safety mechanism in a charging device for an electric vehicle that can be manufactured at a low cost with a simple structure.

  As is well known, with the rapid progress of motorization and economic development in China and developing countries in recent years, energy consumption has increased rapidly, and the deterioration of the global environment, such as an increase in carbon dioxide gas, has become a major social issue. Since the depletion of fossil fuels has become a reality and the future of conventional automobiles powered by internal combustion engines has become a concern, the development of secondary battery technology has recently advanced and the use of fossil fuels In order to reduce electric vehicles and plug-in hybrid vehicles (EV: electric-vehicle) are becoming the mainstream of the times.

  By the way, since an electric vehicle has a limited battery capacity, a cruising distance per charge is limited, and thus devices and facilities (charging stations) that can be charged throughout the city are required.

  Conventional automobiles powered by internal combustion engines powered by gasoline, etc., can be refueled in a short time at gasoline stations installed in various places, but electric cars take time to charge, As in the past, it is not possible to charge the battery as if it were simply refueling at a gas station.

  For this reason, a method for replacing the battery of the electric vehicle itself has been proposed, but it takes a long time to recharge the battery, and the battery must be used exclusively for the scale of the vehicle. The unit price is high, and the volume per unit energy is much larger than that of fuel such as gasoline. Therefore, it is very difficult to place a large number of charged batteries in various places like a gas station.

  Therefore, as a new means, since the car is parked for a relatively long time, the parking space can be used as a charging place for electric vehicles and the parking time can be used for charging. I can think of a plan to go.

  In particular, a coin parking lot that is provided with a plurality of compartments in a parking lot, detects entry / exiting compartments, operates a lock mechanism, and charges a parking fee according to the parking time, is an optimal charging place for an electric vehicle.

  Of course, the charging place is not limited to the coin parking lot, but it is not a problem if it is a place where the car is parked, such as a general parking lot, but as a charging device installed in those places, it is safe and easy for the user to use It is desirable that simple ones are good, and that they are simple and difficult to break down on the side of the installation company, and have economic efficiency that is easy to introduce.

  Conventionally, many charging stations for charging at a voltage of 200V or 100V class have already been disclosed, and among these, the simplest outlet type having only a 100V or 200V outlet, A type that starts charging by connecting a cable between the charging stand and a charging start button or switch, and a type that has a timer switch so that charging can be started with inexpensive power at night (see, for example, Patent Document 1) There are a key operation type that can limit the user and a type that can recognize the card to charge the user.

  However, since the electricity bill for charging is as low as a fraction of the gasoline cost of a gasoline vehicle, it is difficult for businesses that install a charging stand for commercial use to collect investment funds at an expensive charging stand. There is a problem that there is.

  In addition, when the EV charging stand is installed in a coin parking lot or the like, a charging power supply and an EV cord are directly connected to each other, so that the EV and the charging stand are electrically connected. After the connection is established, the charging switch is operated to start charging.However, if this order is incorrect, the charging switch is turned on and a voltage is applied to the output terminal of the charging stand. When the connection with the EV is made, an electric spark may be generated and the connection plug may be damaged.

  Also, when disconnecting the charging stand from the EV after charging, if the charging electromagnetic switch is switched on and still energized, the connection to the EV will be disconnected. There was also a risk of electrical sparks.

  Furthermore, the charging stand is often installed outdoors, so if it is raining and you leave the charging cable connected to the outlet, you may accidentally touch the cable tip or the cable tip plug may get wet. There was also a risk of electric shock due to electric leakage.

Japanese Patent Laid-Open No. 7-115732 (page 2-3, FIG. 1-3)

  The present invention has been made in view of the above-mentioned problems in conventional charging devices for electric vehicles, and the object of the present invention is to prevent electric shock and electric leakage, and Provided is a safety mechanism for an electric vehicle charging device that can ensure electrical safety, prevent damage to equipment such as a connection plug, and can be manufactured at a low cost with a simple structure. There is.

  Means employed by the present inventor for solving the above technical problem will be described with reference to the accompanying drawings.

That is, the present invention relates to a charging device for charging a vehicle-mounted battery V of an electric vehicle.
A main power switch 1 capable of energizing the main electric wire M by switching on / off the electric power supplied from the external power source P;
An electromagnetic open / close switch 2 installed in the main electric wire M downstream from the main power switch 1, electromagnetically driven, and further capable of switching on / off of energization downstream;
A voltage input terminal 31 capable of detecting a voltage in the main electric wire M and a current input terminal 32 capable of detecting a current in the main electric wire M, and at least a voltage is applied in the main electric wire M; A disconnection detection device 3 capable of outputting a disconnection signal S when a current value in the main electric wire M is detected to be smaller than a preset current value;
A timer relay device 4 which receives the disconnection signal S from the disconnection detection device 3 and can switch the energization path after a predetermined time;
An alarm device 5 capable of displaying an alarm state by generating at least a buzzer sound or lighting a lamp;
An output terminal 6 disposed at an end of the main electric wire M and capable of connecting a conductive wire to the in-vehicle battery V;
Comprising at least
When the main power switch 1 is turned on and energized, power is supplied to the output terminal 6 through the main wire M,
At least a voltage is detected in the main electric wire M by the voltage input terminal 31 of the disconnection detecting device 3, and a current value in the main electric wire M is detected by the current input terminal 32 smaller than a preset current value. When this is done, the disconnection signal S is output from the output terminal 6 assuming that the vehicle battery V is not energized,
When the timer relay device 4 receives the disconnection signal S and switches the energization path after a predetermined time, the electromagnetic open / close switch 2 is driven to the off side, and the energization to the main electric wire M is interrupted.
By adopting the technical means that the alarm state is displayed by the alarm device 5 that has received the disconnection signal S through the operation of the timer relay device 4, the safety mechanism in the charging device for the electric vehicle is provided. Completed.

  Further, in order to solve the above-described problems, the present invention provides technical means for making the output terminals of the voltage input terminal 31 and the current input terminal 32 of the disconnection detecting device 3 into contact outputs in addition to the above means as necessary. Can be adopted.

  Furthermore, in order to solve the above-described problems, the present invention provides a technical means for driving the electromagnetic switching switch 2 by applying a voltage to the excitation circuit in addition to the above-described means as necessary. Can be adopted.

  Furthermore, in order to solve the above-described problems, the present invention provides a signal from the current transformer 32a disposed at the tip of the current input terminal 32 of the disconnection detecting device 3 in addition to the above means as necessary. It is possible to adopt a technical means for making it input.

  Furthermore, in order to solve the above-described problems, the present invention can employ technical means in which the external power supply P is set to an AC 100 to 200 volt class in addition to the above means as necessary.

In the present invention, in a charging device for charging an on-vehicle battery of an electric vehicle, at least a main power switch, an electromagnetic switch, a disconnection detection device, a timer relay device, an alarm device, and an output terminal are provided. Comprising
When the main power switch is turned on and energized, power is supplied to the output terminal through the main electric wire, while at least the voltage is detected in the main electric wire by the voltage input terminal of the disconnection detecting device, and the current When the current value in the main electric wire is detected to be smaller than the preset current value by the input terminal, a disconnection signal is output from the output terminal, assuming that the vehicle battery is not energized. Is received by the timer relay device, and the electromagnetic open / close switch is driven to the off side by switching the energization path after a predetermined time to cut off the energization to the main electric wire and through the operation of the timer relay device. The alarm state can be displayed by the alarm device that has received the disconnection signal.

  Therefore, according to the safety mechanism of the present invention, it is possible to prevent electric shock and electric leakage, to ensure the electrical safety of the user, and to prevent damage to devices such as connection plugs. Since it can be manufactured at a low cost with a simple structure, it can be said that the industrial utility value is very large.

It is the schematic showing the safety mechanism of embodiment of this invention. It is a flowchart showing operation | movement of the safety mechanism of embodiment of this invention.

  The mode for carrying out the present invention will be described in more detail with reference to the drawings specifically illustrated as follows.

  An embodiment of the present invention will be described with reference to FIGS. 1 and 2. In the figure, what is indicated by reference numeral 1 is a main power switch. This main power switch 1 is a switch capable of energizing the main electric wire M by switching on / off the power supplied from the external power source P. It is. The main power switch 1 can be accommodated in a power receiving panel, and a power leakage switch can be appropriately accommodated in the power receiving panel.

  Also, what is indicated by reference numeral 2 is an electromagnetic open / close switch. This electromagnetic open / close switch 2 is installed in the main electric wire M downstream of the main power switch 1 and is electromagnetically driven to further downstream. It is a switch that can switch on / off of energization. In the present embodiment, the electromagnetic open / close switch 2 employs a switch that can be driven and opened by applying a voltage to the excitation circuit.

  Furthermore, what is indicated by reference numeral 3 is a disconnection detecting device, and this disconnection detecting device 3 can detect a voltage input terminal 31 capable of detecting a voltage in the main electric wire M and a current in the main electric wire M. When a current input terminal 32 is provided and at least a voltage is applied in the main electric wire M, a disconnection signal S is generated when a current value in the main electric wire M is detected to be smaller than a preset current value. Output is possible.

  In the present embodiment, the output terminals of the voltage input terminal 31 and the current input terminal 32 of the disconnection detection device 3 can be used as contact outputs and can be connected to a part of the main electric wire M. Further, in the present embodiment, it is possible to employ a device to which a signal from a current transformer 32a (CT: current-trance) having a current input terminal 32 disposed at the tip is input.

  Furthermore, what is indicated by reference numeral 4 is a timer relay device. The timer relay device 4 can receive the disconnection signal S from the disconnection detection device 3 and can switch the energization path after a predetermined time.

  Furthermore, what is indicated by reference numeral 5 is an alarm device, and this alarm device 5 can display an alarm state at least by generating a buzzer sound or lighting a lamp.

  Furthermore, what is indicated by reference numeral 6 is an output terminal, and this output terminal 6 is disposed at the end of the main electric wire M and can be connected to a conductive wire to the in-vehicle battery V or the like.

  Thus, the present invention is a safety mechanism in a charging device for charging a vehicle-mounted battery V of an electric vehicle, and a specific use procedure will be described below.

  First, the main power switch 1 is turned on, and the main electric wire M is energized from the external power source P. Then, the charging start switch 41 of the timer relay device 4 is operated to excite the excitation circuit of the electromagnetic switch 2 to turn on the switch, and power is supplied to the output terminal 6 through the main electric wire M. At this time, in the timer relay device 4, the “closed” b-contact is used when the charging start switch 41 is off. Therefore, when the charging start switch 41 is operated, the electromagnetic open / close switch 2 is turned on and the output terminal 6 is energized. Then, the battery can be charged normally. At this time, the power lamp can be appropriately turned on.

  In the present embodiment, an external power source P of 100 to 200 volts is adopted, and a socket-type outlet plug is adopted for the output terminal 6. In this energized state, the in-vehicle battery V of the electric vehicle can be charged via the output terminal 6.

  Next, for example, when the charging of the in-vehicle battery V is completed, when the plug or the like is disconnected at the output terminal 6, or when the main electric wire M is disconnected for some reason, the disconnection detection device When the voltage input terminal 31 detects at least a voltage in the main electric wire M and the current input terminal 32 detects a current value in the main electric wire M smaller than a preset current value, A disconnection signal S is output from the output terminal 6 on the assumption that the vehicle battery V is not energized.

  At this time, by making each of the input terminals 31 and 32 of the disconnection detecting device 3 a contact output, when there is no input to the voltage and current terminals, and when there is a voltage and the current flows more than a certain value, the contact output is When the voltage is applied and the current is below a certain current, the contact output is turned on. Therefore, when the charging start switch 41 is turned on to start charging, the electromagnetic switch 2 is turned on and a voltage is applied to the output terminal 6. At this time, if the output terminal 6 is connected to the in-vehicle battery V, charging is performed.

  Even when the electromagnetic switching switch 2 is turned on, when the connection between the output terminal 6 and the in-vehicle battery V is not made or the current is below a certain current, the contact output of the disconnection detecting device 3 is turned on. When the timer relay device 4 receives the disconnection signal S and switches the energization path (to contact a) after a predetermined time (for example, 30 to 60 seconds), the electromagnetic switch 2 is driven to the off side. The power supply to the main electric wire M is cut off.

  That is, when the charging start switch 41 is turned on without connecting a cable or the like to the connection terminal 6, the electromagnetic switch 2 is once turned on and a voltage is output to the output terminal 6, but no current flows. When the detection device 3 detects, the contact of the output terminal of the disconnection detection device 3 is turned on.

  In this embodiment, this contact ON state is used to send a control signal to the timer relay device 4, and after a certain time set by the timer relay device 4 has passed from that moment, the contact of the timer relay device 4 is turned ON. To. For this reason, the b-contact of the timer relay device 4 that has excited the electromagnetic switch 2 is opened, the electromagnetic switch 2 is turned off, and the voltage output to the output terminal 6 is stopped.

  Further, the alarm state is displayed by the alarm device 5 that has received the disconnection signal S through the operation of the timer relay device 4. In this embodiment, the alarm device 5 that generates a buzzer sound for a predetermined time is adopted.

  In the charging stand, other dangerous situations that can be envisaged are disconnecting the connection cable with the in-vehicle battery V during charging, or leaving the battery stand as it is for a long time. Also, if the charging stand is output via cable instead of outlet output, if the plug part is left on the ground, or if water accumulates on the ground surface during rain, there is a risk of electrical leakage or electric shock. Becomes higher. In the present embodiment, even when the connection at the connection terminal 6 is forcibly disconnected during charging, the disconnection detection device 3 detects no current, so that the output contact is turned on.

  Then, the user can be notified of the connection interruption by a buzzer or the like of the alarm device 5, and the electromagnetic switching switch 2 is automatically turned off after a predetermined time by the operation of the timer relay device 4. In this way, no voltage is output to the output terminal 6 of the charging device for a long time without being connected to the in-vehicle battery V, and the safety of the charging stand is ensured.

  The normal charging is stopped by turning off the charging start switch 41. As a result, the supply of voltage to the electric control circuit is cut off, so that the supply of electricity to the contacts of the electromagnetic switch 2, the timer relay device 4, and the disconnection detector 3 is stopped, so the electromagnetic switch 2 is turned off. The voltage output to the output terminal 6 is lost, and the state before the start of charging is restored.

  The present invention is generally configured as described above. However, the present invention is not limited to the illustrated embodiment, and various modifications can be made within the scope of the claims, for example, an output terminal. In FIG. 6, the case where a plug socket type outlet is used is illustrated, but a charging cable can be used directly for output without using an outlet.

  Further, the alarm device 5 can be notified by an alarm sound such as a buzzer, a lamp display, a display device such as a liquid crystal or a sound generator, and the external power source P is not limited to an AC power source. , A DC power supply (24V, etc.) may be used, and any of these is within the technical scope of the present invention.

1 Main power switch 2 Electromagnetic switch 3 Disconnection detector
31 Voltage input terminal
32 Current input terminal
32a Current transformer S Disconnection signal 4 Timer relay device
41 Charging start switch 5 Alarm device 6 Output terminal V Car battery P External power supply M Main wire

Claims (5)

In a charging device for charging an on-vehicle battery V of an electric vehicle,
A main power switch 1 capable of energizing the main electric wire M by switching on / off the electric power supplied from the external power source P;
An electromagnetic open / close switch 2 installed in the main electric wire M downstream from the main power switch 1, electromagnetically driven, and further capable of switching on / off of energization downstream;
A voltage input terminal 31 capable of detecting a voltage in the main electric wire M and a current input terminal 32 capable of detecting a current in the main electric wire M, and at least a voltage is applied in the main electric wire M; A disconnection detection device 3 capable of outputting a disconnection signal S when a current value in the main electric wire M is detected to be smaller than a preset current value;
A timer relay device 4 which receives the disconnection signal S from the disconnection detection device 3 and can switch the energization path after a predetermined time;
An alarm device 5 capable of displaying an alarm state by generating at least a buzzer sound or lighting a lamp;
An output terminal 6 disposed at an end of the main electric wire M and capable of connecting a conductive wire to the in-vehicle battery V;
Comprising at least
When the main power switch 1 is turned on and energized, power is supplied to the output terminal 6 through the main wire M,
At least a voltage is detected in the main electric wire M by the voltage input terminal 31 of the disconnection detecting device 3, and a current value in the main electric wire M is detected by the current input terminal 32 smaller than a preset current value. When this is done, the disconnection signal S is output from the output terminal 6 assuming that the vehicle battery V is not energized,
When the timer relay device 4 receives the disconnection signal S and switches the energization path after a predetermined time, the electromagnetic open / close switch 2 is driven to the off side, and the energization to the main electric wire M is interrupted.
A safety mechanism in a charging device for an electric vehicle, wherein an alarm state is displayed by an alarm device 5 that has received the disconnection signal S through the operation of the timer relay device 4.   The safety mechanism in the charging device for an electric vehicle according to claim 1, wherein the output terminals of the voltage input terminal 31 and the current input terminal 32 of the disconnection detecting device 3 are contact outputs.   The safety mechanism in the charging device for an electric vehicle according to claim 1 or 2, wherein the electromagnetic switch 2 is driven by applying a voltage to the excitation circuit.   4. The electric vehicle according to claim 1, wherein a signal from a current transformer 32 a disposed at a distal end portion is input to the current input terminal 32 of the disconnection detection device 3. Safety mechanism for charging equipment.   The safety mechanism in the charging device for an electric vehicle according to any one of claims 1 to 4, wherein the external power source P is an AC 100 to 200 volt class.

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