KR20040024082A - Charging system controlling device of electric vehicle - Google Patents

Abstract

PURPOSE: A charge system control apparatus is provided to protect a human body from an electric shock and ensure improved safety for driver, while preventing damages of the charge control system. CONSTITUTION: A charge system control apparatus comprises an earth leakage breaker(210); a charger(220) connected to the earth leakage breaker through a charge cable; a main contactor(230) electrically connected between the charger and a driving battery(235), wherein the main conductor controls flow of the power of the driving battery in accordance with the switching operation; and a motor controller(240) equipped with an earth leakage breaker control circuit which constitutes an electrical circuit in the power supply range between the earth leakage breaker and the charger, and automatically cuts off the power being supplied to the charger from the earth leakage breaker by controlling the earth leakage breaker upon occurrence of abnormal isolation of the charge system during battery charge.

Description

Charging system controller for electric vehicles {CHARGING SYSTEM CONTROLLING DEVICE OF ELECTRIC VEHICLE}

The present invention relates to an electric vehicle, and more particularly to a charging system control apparatus for an electric vehicle.

Typically, a charging system of an electric vehicle has a driving battery 110, a driving motor 120, a motor controller 130, a charger 140, a main contactor 150, an earth leakage breaker 160 (power breaker). It consists of a switchboard.

In the electric vehicle, when the high voltage line of the motor controller 130 including the driving battery 110 and the driving motor 120 are shorted due to insulation breakdown, problems such as an electric shock of the human body and a burnout of the control system may occur.

In order to prevent such a problem, an insulation voltage measuring circuit is built in the motor controller 130.

When the voltage measured by the insulation voltage detection circuit exceeds a specific voltage reference value, the motor controller 130 stops driving the electric vehicle and sends a control signal to the main contactor 150 to send the main contactor 150 (Main Contactor). ) Is controlled to automatically cut off the driving battery 110 power.

In addition, the charging of the electric vehicle is controlled to stop the control of the charger 140.

A control method has been developed that detects a voltage leaking to the vehicle body and automatically cuts off the connection of the driving battery 110 that supplies power of the electric vehicle during driving (charging) and stops driving (charging). In the process.

However, when using the above method, conventionally, only the power of the driving battery 110 of the electric vehicle is automatically cut off or stops the charging, but the internal section of the charger 140 mounted inside the electric vehicle through the charging cable from the AC power switchboard. It does not automatically cut off the state that AC power is being supplied to.

Therefore, when a high voltage leaks into the vehicle body in a section from the charging connector inside the electric vehicle to the output front end of the charger 140, there is a problem that the electric shock risk of the driver still exists.

An object of the present invention is to provide an electric vehicle charging system control device that can prevent electric shock and control system burnout, etc., which may threaten the safety of the driver by automatically shutting off the power when an insulation abnormality of the electric vehicle charging system occurs.

1 is a view showing the configuration of a charging system control apparatus for an electric vehicle according to the prior art.

2 is a view showing the configuration of a charging system control apparatus for an electric vehicle according to an embodiment of the present invention.

In order to achieve the above object, the present invention provides a charging system control apparatus for an electric vehicle, comprising: an earth leakage breaker; A charger connected with the earth leakage breaker and a charging cable; A main contactor electrically connected between the charger and the driving battery to regulate the flow of driving battery power according to a switching state; An electrical circuit is configured in a power supply section between the ground fault breaker and the charger to control the ground fault breaker when an insulation failure of a charging system occurs when the driving battery is charged, thereby automatically supplying power supplied from the ground breaker to the charger through a charging cable. It characterized in that it comprises a motor controller in which the earth leakage breaker control circuit for performing the operation to cut off.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details, such as the following description and the annexed drawings, are shown to provide a more general understanding of the invention, these specific details are illustrated for the purpose of explanation of the invention and are not meant to limit the invention thereto. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

Referring to Figure 2 will be described the configuration and operation of the electric vehicle charging system control apparatus according to an embodiment of the present invention.

Embodiment of the present invention, in the electric vehicle charging system control device, comprising a circuit breaker 210, a charger 220, a main contactor 230 (Main Contactor), a motor controller 240.

The charger 220 is connected to the earth leakage breaker 210 and the charging cable 215 as shown in FIG.

The main contactor 230 is electrically connected between the charger 220 and the driving battery 235 to regulate the flow of power of the driving battery 235 according to the switching state.

The motor controller 240 configures an electric circuit in a power supply section between the ground fault breaker 210 and the charger 220 to control the ground fault breaker 210 when an insulation abnormality of the charging system occurs when the driving battery 235 is charged. An earth leakage breaker control circuit is installed to automatically cut off power supplied from the breaker 210 to the charger 220 through the charging cable 215.

The earth leakage breaker control circuit included in the motor controller 240 includes an isolation voltage detector 242 for connecting the chassis ground to the neutral point.

The insulation voltage detector 242 may include a first operational amplifier 244 (OP1) that senses the total voltage V_Batt of the driving battery 235, a chassis ground and a driving battery 235 based on a neutral point. And a second operational amplifier 246 (OP2) for sensing the B (-) terminal voltage V_ISO.

The insulation voltage detected through the insulation voltage detector 242 is

Insulation voltage = (V_Batt / 2)-V_ISO

Is calculated.

An embodiment of the present invention is connected through the electrical circuit between the motor controller 240 and the charger 220, the output control signal for controlling the drive of the circuit breaker 210 is generated from the motor controller 240 to input It is configured to further include a relay (250) (Relay1) to be driven as it is driven to flow the power input to the charger 220 to the power ground (G2).

In addition, it is built in the circuit breaker 210, and further comprises an image current transformer 260 (ZCT) to detect the leakage current to automatically cut off the power.

As described above, the embodiment of the present invention automatically cuts off the power when an insulation abnormality occurs in the charging system for an electric vehicle.

Problems such as damage to the insulation of a charging system that uses AC power to charge an electric vehicle and damage to the human body and a control system that may threaten the driver's safety in case of a short circuit may occur.

In the charging system for an electric vehicle according to an embodiment of the present invention, when a high voltage leaks into a vehicle body, a risk of electric shock of a driver still exists, so that an AC power is supplied by controlling an earth leakage breaker 210 that is mandatoryly mounted on a switchboard in an electric vehicle. By fundamentally blocking the state from the switchboard, human body electric shock and control system damage can be prevented.

That is, when a high voltage leaks into the vehicle body during charging of an electric vehicle, a short circuit occurs in a section where AC power is supplied to an internal charger 220 section of the electric vehicle through the charging cable 215 in a switchboard that could not be automatically cut off by the conventional technology. By configuring a circuit breaker control circuit it is possible to perform a control operation to automatically cut off the earth leakage breaker 210 of the switchboard.

The operation principle of the ground fault breaker 210 according to the embodiment of the present invention will be described.

First, when the circuit passing from the power supply to the load side is passed through the image current transformer 260 (ZCT), when the circuit is normal, the magnetic fluxes generated in the image current transformer 260 cancel each other and no current is generated.

On the contrary, when a current leakage occurs in the circuit, magnetic flux due to the leakage current is generated in the iron core of the image current transformer 260 to induce a voltage in the secondary winding.

At this time, the voltage induced in the secondary winding is amplified by the amplifier AMP to operate the switchgear of the converter as a trip coil (Trip Coil) to cut off the electricity.

The vehicle leakage voltage is connected to the chassis ground by the neutral point in the insulation voltage detector 242 of FIG. 2, and the total voltage V_Batt of the voltage of the driving battery 235 in the first operational amplifier 244 (OP1). The sensing voltage is sensed by sensing the chassis ground and the B (-) terminal voltage V_ISO of the driving battery 235 based on the neutral point in the second operational amplifier 246 (OP2) to calculate the insulation voltage as follows. do.

Insulation voltage = (V_Batt / 2)-V_ISO

When the insulation voltage is "0" V (Volt), it means a state of good insulation, and when a specific voltage abnormality occurs, the insulation state is destroyed and leaked, so that the relay 250 for controlling the earth leakage breaker 210 in the motor controller 240. When (Relay1) output is generated in the form of a pulse, the b-phase power of the AC power flows through the relay 250 and the resistor R1 to the power ground G2.

At this time, the current transformer 260 of the leakage circuit breaker 210 detects a leakage current to automatically cut off the AC power.

As described above, the charging system control apparatus for an electric vehicle according to the present invention performs a control operation to automatically cut off a circuit breaker of a switchgear when high voltage leaks into the vehicle body during charging of an electric vehicle, thereby preventing human electric shock and driver safety. have.

In addition, there is an effect of ensuring the safety reliability of the electric vehicle by preventing damage to the charge control system due to high voltage leakage.

Claims (6)

In a charging system controller for an electric vehicle, An earth leakage breaker; A charger connected with the earth leakage breaker and a charging cable; A main contactor electrically connected between the charger and the driving battery to regulate the flow of driving battery power according to a switching state; An electrical circuit is configured in a power supply section between the ground fault breaker and the charger to control the ground fault breaker when an insulation failure of a charging system occurs when the driving battery is charged, thereby automatically supplying power supplied from the ground breaker to the charger through a charging cable. Charging system control apparatus for an electric vehicle comprising a motor controller having a built-in circuit breaker control circuit for performing the operation to cut off. The apparatus of claim 1, wherein the earth leakage breaker control circuit embedded in the motor controller comprises an isolation voltage detector configured to connect a chassis ground to a neutral point. The method of claim 2, wherein the insulation voltage detection unit A first operational amplifier OP1 sensing the total voltage V_Batt of the driving battery voltage; And a second operational amplifier (OP2) configured to sense a chassis ground and a B (-) terminal voltage (V_ISO) of the driving battery based on the neutral point. The insulation voltage of claim 3, wherein the insulation voltage detected through the insulation voltage detector is measured. Insulation voltage = (V_Batt / 2)-V_ISO Charging system controller for an electric vehicle, characterized in that calculated as. According to claim 1, It is connected via the electrical circuit between the motor controller and the charger input terminal, the output control signal for controlling the drive of the earth leakage breaker is driven by being input from the motor controller is input to the charger Charging system control apparatus for an electric vehicle, characterized in that it further comprises a relay (Relay1) for flowing power to the power supply ground (G2). The apparatus of claim 5, further comprising an image current transformer (ZCT) embedded in the ground fault circuit breaker and detecting a leakage current to automatically cut off power.