KR101853427B1 - High voltage charging device and charging method for vehicle - Google Patents

Abstract

The present invention relates to an electronic switch comprising a mechanical switch coupled to a power source providing charging power, a first electromagnetic contactor having an input connected to an output of the mechanical switch, a second electromagnetic contactor connected in parallel to the first electromagnetic contactor, A first switch having an input terminal connected to an output terminal of the first electromagnetic contactor and an output terminal coupled to an input terminal of the battery system, and a second switch connected to the input terminal of the first electromagnetic contactor and the resistor A second switch that operates at the initial application of the charging power and supplies the charging power that has passed through the mechanical switch to the resistor; a voltage sensing unit that senses an output terminal voltage of the first electromagnetic contactor and the first switch; A third switch operative when the first electromagnetic contactor and the first switch are fused to open the mechanical switch, The first switch, the second switch, the inrush current reducing resistor, and the first switch during the set time at the initial application of the charging power, and after the set time, A contactor, and a control unit for forming a main path made up of the first switch to allow the battery to be charged.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high voltage charging device for a vehicle,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high voltage charging device for a vehicle and a charging method.

In recent years, research and investment have been made actively on the reduction of carbon dioxide emitted from automobiles using fossil fuels, mainly in the major industrialized countries of the world. Typically, it is a green car business such as EV (Electric Vehicle), HEV (Hybrid Electric Vehicle), PHEV (Plug-in Hybrid Electric Vehicle) and FCEV (Fuel Cell Electric Vehicle).

Interest in and investment in the green car business is active not only in the government but also in the private sector. There is no doubt that it will produce better quality products, whether large or small, such as domestic and foreign major automobile producers, battery manufacturers, EVSE (Electric Vehicle Supply Equipment) manufacturers.

The charging method between EV and EVSE can be divided into charging method using AC (alternating current) and charging method using DC (direct current). In the AC charging method, AC applied from the primary side is supplied to the EV by opening and closing an MC (magnetic contactor) in the EVSE. In addition, the DC charging method converts power to DC through an AC-DC converter and a DC-DC converter in EVSE, and then supplies electric power to the EV through opening and closing a magnetic connector (MC) and controlling voltage and current.

However, an inrush current may occur during AC charging between the EV and the EVSE. Inrush current refers to a phenomenon in which an excess current flows temporarily beyond the constant current of a momentary load with a contact in the power system. It appears in several forms depending on the nature of the load, and the transfer rate ranges from several times to several tens of times its rated value. In charging between EV and AC EVSE, the inrush current can be regarded as a capacitor load. The actual EV is equipped with an inverter, a capacitor is installed in the inverter, and the power supplied from the EVSE passes through the inverter.

Such inrush currents cause deterioration of power distribution facilities, degradation of performance, inability to cooperate with protection, and even deterioration of the quality of electronic equipment. For example, an in-plant voltage drop due to an inrush current can occur and an inrush current of a 6.6KV high-voltage transformer can cause an explosion by a capacitor.

In addition, as a charging device for a green car, a load having a large capacity is used as a load, which causes a problem in that an internal switch is fused during a long time operation.

SUMMARY OF THE INVENTION An object of the present invention is to provide an alternating current charging device that reduces an inrush current and solves the problem of switch fusion in a power system circuit configuration of an alternating current charging device.

Embodiments according to the present invention can be used to accomplish other tasks not specifically mentioned other than the above-described tasks.

According to one aspect of the present invention, there is provided a high voltage charging device for a vehicle, comprising: a mechanical switch coupled to a power source for providing charging power; a first switch having an input terminal connected to an output terminal of the mechanical switch; An inrush current reducing resistor connected in parallel to the switch for reducing an inrush current generated at the time of initial application of the charging power, a second switch having an input terminal connected to the output terminal of the first switch and an output terminal coupled to an input terminal of the battery system, A third switch coupled in series with the resistor and operative upon initial application of the charging power to cause the charging power passed through the mechanical switch to be supplied to the resistor, The auxiliary switch comprising the mechanical switch, the third switch, the inrush current reducing resistor, and the second switch Forming in, and form a set time after the primary path composed of the mechanical switch, the first switch, the second switch and a control unit that causes the battery is charged.

The high voltage charging device for a vehicle may further include an input terminal connected to the output terminal of the second switch, an output terminal coupled to the ground terminal, and a sub-path coupled to the ground terminal, And a residual voltage removing unit.

The vehicle high voltage charging apparatus may further include a voltage sensing unit for sensing an output terminal voltage of the first switch and the second switch.

The vehicle high voltage charging apparatus may further include a fourth switch mechanically connected to the mechanical switch. When the control unit determines that the first switch and the second switch are welded together after completion of charging the battery, Thereby opening the mechanical switch.

The vehicle high voltage charging device is connected in series to the second switch to form the main path together with the mechanical switch, the first switch and the second switch, and the output terminal is connected to an input terminal of the residual voltage removing unit, The control unit may operate the residual voltage eliminating unit to cause the overcurrent to flow through the first and second switches when the battery is charged and after the battery is charged, .

Wherein the control unit controls the on / off of the second switch when the first switch is fused when the charging power is applied to perform control corresponding to fusion of the first switch, Controls the on / off of the third switch to perform control corresponding to fusion of the second switch, and operates the fourth switch when the first and second switches are fusion-bonded.

For example, the first and second switches are electromagnetic contactors, the third switch is a capacitor switch, and the fourth switch is a shunt switch.

According to an aspect of the present invention, there is provided a method of charging a high voltage charging device for a vehicle, including a mechanical switch coupled to a power source, a first switch having an input terminal connected to an output terminal of the mechanical switch, A second switch having an input terminal connected to the output terminal of the first switch and an output terminal coupled to an input terminal of the battery system, and a second switch connected in series to the input terminal of the first switch and the inrush current reducing resistor, 3 switch, a fourth switch mechanically connected to the mechanical switch, the method comprising the steps of: closing the second switch in accordance with a received charge start signal; Waiting for a first waiting time, closing the third switch after the first waiting time, Closing the first switch, closing the first switch, closing the first switch, and closing the first switch when the battery is fully charged. The method of claim 1, further comprising: And causing the battery to be charged by the main path including the mechanical switch, the first switch, and the second switch.

The charging method of the high voltage charging apparatus for a vehicle may further include the step of simultaneously opening the first and second switches in accordance with a charging end signal.

The charging method of the high voltage charging apparatus for a vehicle may further include the step of opening the mechanical switch by tripping the fourth switch if the first and second switches are fused.

The charging method of the high voltage charging apparatus for a vehicle may further include a residual voltage removing unit having an input terminal connected to the output terminal of the second switch and an output terminal coupled to the ground terminal and including a resistor, Opening the first switch in response to a charge termination signal and opening the residual voltage eliminator so that the output terminal of the second switch is connected to the ground terminal and the residual voltage is removed by the resistor The method comprising the steps of:

According to another aspect of the present invention, there is provided a high voltage charging device for a vehicle, comprising: a mechanical switch coupled to a power source for providing charging power; a first switch connected to an output terminal of the mechanical switch; 1 switch connected in parallel to the resistor and operable at the initial application of the charging power to pass through the mechanical switch and connected to the switch in series, the inrush current reducing resistor being connected in parallel to the switch for reducing the inrush current generated during the initial application of the charging power, A third switch connected in series to the first switch to form an auxiliary path together with the resistor and the third switch when the first switch is opened, A main path is formed together with the first switch, and when the voltage difference between the input terminal and the output terminal is equal to or greater than a set value, A residual voltage removing unit having an input terminal connected to an output terminal of the earth leakage cutoff switch and an output terminal coupled to a ground terminal, and a control unit for controlling the mechanical switch, the third switch, the inrush current And a secondary path made up of the earth leakage cutoff switch is formed. After the set time, a main path made up of the mechanical switch, the first switch, and the earth leakage cutoff switch is formed to charge the battery, And a control unit for operating the residual voltage eliminating unit to cause a power path to be formed between the electrical leakage cutoff switch and the residual voltage removing unit.

The vehicle high voltage charging apparatus may further include a fourth switch mechanically connected to the mechanical switch. When the abnormal voltage is detected during a time other than the battery charging, the controller trips the fourth switch to open the mechanical switch .

According to one embodiment of the present invention, the residual voltage remaining after completion of charging is reduced while reducing the rush current at the time of initial charging power application, and stable operation is enabled in response to fusion of the internal electronic switch such as the electromagnetic contactor.

1 is a block diagram of a high voltage charging device for a vehicle according to a first embodiment of the present invention.
2 is a block diagram of a high voltage charging device for a vehicle according to a second embodiment of the present invention.
3 is a circuit diagram of a high voltage charging apparatus for a vehicle according to the first embodiment of the present invention.
4 is a circuit diagram of a high voltage charging apparatus for a vehicle according to a second embodiment of the present invention.
5 is a circuit diagram of a high voltage charging apparatus for a vehicle according to a third embodiment of the present invention.
6 is a circuit diagram of a high voltage charging apparatus for a vehicle according to a fourth embodiment of the present invention.
7 is a flowchart of a high voltage charging method for a vehicle according to an embodiment of the present invention.
8 is an operational flowchart corresponding to fusion of MC1 and MC2 of the high voltage charging apparatus for a vehicle according to the embodiment of the present invention.
9 is an operation flowchart corresponding to fusing and residual voltage removal of a high voltage charging apparatus for a vehicle according to an embodiment of the present invention.
10 is a flowchart of a residual voltage removing operation of the high voltage charging apparatus for a vehicle according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are used for the same or similar components throughout the specification. In the case of publicly known technologies, a detailed description thereof will be omitted.

In this specification, when a part is referred to as "including " an element, it is to be understood that it may include other elements as well, without departing from the other elements unless specifically stated otherwise. Also, the terms "part," " module, "and the like, which are described in the specification, refer to a unit for processing at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software.

Hereinafter, a high voltage charging apparatus for a vehicle according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a high voltage charging device for a vehicle according to a first embodiment of the present invention. 1, the high voltage charging apparatus 100 for a vehicle according to the first embodiment of the present invention includes a power source 10 and a battery system 20 and is disposed between the power source 10 and the battery system 20, To be supplied to or blocked by the battery system 20.

To this end, the vehicle high voltage charging apparatus 100 is connected to an output terminal of a mechanical switch MS and a mechanical switch MS coupled to a power source 10 and connected to an input terminal of the battery system 20 1 switch SW and controls the on / off operation of various electronic switches installed in the high voltage charging apparatus 100 for a vehicle. The mechanical switch MS is manually turned on / off by the user, and the first switch SW is turned on / off by the control unit 110. Here, the first switch may be one of various types of electronic switches, and may be preferably a magnetic contactor (MC).

The in-vehicle high-voltage charging apparatus 100 generates an inrush current at the moment when the first switch SW is turned on for charging as described in the related art, and the inrush current is generated due to a failure of the switching device, The life of the switching element is shortened and a secondary accident occurs due to malfunction of the apparatus. In particular, it is essential to reduce the inrush current because the green battery charges the battery using a high voltage.

Accordingly, the vehicle high-voltage charging apparatus 100 has the inrush current reducing unit 120 for reducing the inrush current generated when the first switch SW is turned on. The inrush current reducing unit 120 reduces the inrush current by limiting the current supplied to the battery system 20 when the initial power is turned on.

On the other hand, when a high voltage is used as the charging power source, the first switch SW is fused and on / off control by the control unit 110 is not performed. When the first switch SW is fused, the battery is continuously short-circuited and the battery is charged even after the charging is completed.

The high voltage charging apparatus 100 for a vehicle has a fusing counterpart 130 corresponding to the fusion of the first switch SW. The fusing counterpart 130 performs a function of turning on / off the power path between the power source 10 and the battery system 20 instead of the first switch SW when the first switch SW is fused. For this purpose, the fusing counterpart 130 includes a voltage sensing unit 131 for detecting the fusion of the first switch SW, and performs on / off function in the power path instead of the first switch SW And a fusing and compensating section 132 including a first fusing switch element to be performed. In addition, the fusion bonding counterpart 130 may further include a second fusion bonding corresponding switch element corresponding to the case where the first fusion bonding corresponding switch element corresponding to fusion bonding of the first switch SW is fusion bonded, The unit 131 further has a function of sensing an output terminal voltage of the first fusion-welding corresponding switch element.

Hereinafter, a high voltage charging apparatus for a vehicle according to a second embodiment of the present invention will be described with reference to FIG. 2 is a block diagram of a high voltage charging device for a vehicle according to a second embodiment of the present invention.

Referring to FIG. 2, the high voltage charging apparatus 100 for a vehicle according to the second embodiment of the present invention is generally the same as the first embodiment of the present invention described above with reference to FIG. However, the high voltage charging apparatus 100 for a vehicle according to the second embodiment of the present invention is different in that the residual voltage removing unit 140 is additionally configured.

Describing the function of the residual voltage removing unit 140, the vehicle high voltage charging apparatus 100 needs to remove the remaining voltage remaining in the earth leakage breaker (including the earth leakage breaker described below) and the cable after the charging is completed, The removal unit 140 performs the function of removing the residual voltage. At this time, the residual voltage removing unit 140 operates after the charging of the battery is completed to remove the residual voltage.

Hereinafter, a high voltage charging apparatus for a vehicle will be described at a circuit level with reference to FIG. 3 to FIG.

3 is a circuit diagram of a high voltage charging apparatus for a vehicle according to the first embodiment of the present invention, in which the control unit 110 is omitted. 3, each phase of the output terminal of the mechanical switch MS and the mechanical switch MS connected to the power supply lines of R phase, S phase, T phase and N phase, And a first electromagnetic contactor MC1 each coupled to a power line (e.g., a power cable) of the battery system.

Here, the power provided by the power source 10 is within the range of 3.3 kW to 43 kW, and a voltage of, for example, AC 380 V is provided. The first electromagnetic contactor MC1 is, for example, MC-40A of LS Industrial Systems.

The vehicle high voltage charging apparatus 100 includes a resistor R1 connected in parallel to the first electromagnetic contactor MC1 to reduce an inrush current. Specifically, one end of the resistor R1 is connected to the input end of the first electromagnetic contactor MC1, and the other end is connected to the output end of the first electromagnetic contactor MC1. The resistor R1 is, for example, 5Ω, 20W resistor.

And a second electromagnetic contactor MC2 replacing the first electromagnetic contactor MC1 in case the first electromagnetic contactor MC1 is fused. At this time, the second electromagnetic contactor MC2 has its input terminal connected to the output terminal of the first electromagnetic contactor MC1, and the output terminal thereof is coupled to the battery system 20. The second electromagnetic contactor MC2 is, for example, MC-40A of LS Industrial Systems.

The vehicle high voltage charging apparatus 100 closes the first electromagnetic contactor MC1 so that an excessive current or inrush current is instantaneously generated when the external power source is applied. To reduce the inrush current, the first electromagnetic contactor A capacitor switch CS and a resistor R1 connected in parallel to each other. At this time, the capacitor switch CS and the resistor R1 are connected in series, and the resistor R1 is connected to the output terminal of the capacitor switch CS or the resistor R1 is connected to the input terminal of the capacitor switch CS.

Here, the capacitor switch CS is configured to cooperate with the first electromagnetic contactor MC1. That is, the capacitor switch CS is operated according to the operation signal (i.e., the close signal) of the first electromagnetic contactor MC1 provided by the control unit 110, and is closed before the first electromagnetic contactor MC1 is closed And is opened when the first electromagnetic contactor MC1 is closed. This capacitor switch CS causes the power input via the mechanical switch MS to be input or cut off to the resistor R1 side. The capacitor switch CS is, for example, the AC-50 of LS Industrial Systems.

The vehicle high voltage charging apparatus 100 also includes a shunt switch (SHT) for preventing power to be supplied to the battery system 20 when both the first and second electromagnetic contactors MC1 and MC2 are fused A voltage sensing unit 131 for measuring an output terminal voltage of the first electromagnetic contactor MC1 and an output terminal voltage of the second electromagnetic contactor MC2 to sense whether the first and second electromagnetic contactors MC1 and MC2 are fusion- . Here, the shunt switch SHT operates under the control of the control unit 110 and is mechanically connected to the mechanical switch MS, so that the mechanical switch MS is operated in the operation (trip operation) of the shunt switch SHT Interworking.

The inrush current reducing unit 120 of the high voltage charging apparatus 100 for a vehicle is constituted by a resistor R1 and a capacitor switch CS connected in parallel to the first electromagnetic contactor MC1, The fusion-compensation section 132 is composed of a second electromagnetic contactor MC2 and a shunt switch SHT.

4 is a circuit diagram of a high voltage charging apparatus for a vehicle according to a second embodiment of the present invention. The high voltage charging apparatus 100 for a vehicle according to the second embodiment of the present invention shown in FIG. 4 is a modification of the first embodiment with reference to FIG. 3, in which the residual voltage removing unit 140 is added.

The residual voltage removing unit 140 is connected to the output terminal of the second electromagnetic contactor MC2. The residual voltage removing unit 140 includes an operation switch SW1 whose one end is connected to the output terminal of the second electromagnetic contactor MC2 and a resistor R2 coupled between the other end and the ground terminal of the operation switch SW1 . In the residual voltage removing unit 140, the operation switch SW1 is kept open when the battery is charged, and the operation switch SW1 is closed when the battery is charged. The residual voltage removing unit 140 performs a function of removing residual voltage remaining after the completion of charging the battery.

5 is a circuit diagram of a high voltage charging apparatus for a vehicle according to a third embodiment of the present invention. The high voltage charging apparatus 100 for a vehicle according to the third embodiment of the present invention shown in Fig. 5 is for the case where the electromagnetic contactor is fused and does not use the shunt switch SHT. In this case, the first high voltage charging device 100 is used when only the first electromagnetic contactor MC1 is used and the first electromagnetic contactor MC1 is fused. When the high voltage charging device 100 for a vehicle is connected to the first and second electromagnetic contactors MC1, And the first and second magnetic contactors MC1 and MC2 are fusion-bonded if the first and second magnetic contactors MC1 and MC2 are used.

In FIG. 5, the second electromagnetic contactor MC2 is shown by a dotted line to further illustrate the use of the second electromagnetic contactor MC2 when the second electromagnetic contactor MC2 is used together with the first electromagnetic contactor MC2 Respectively.

Hereinafter, the case where only the first electromagnetic contactor MC1 is used will be described. As shown in FIG. 5, the high voltage charging apparatus for a vehicle according to the third embodiment of the present invention, after removing the shunt switch SHT in the first embodiment of the present invention with reference to FIG. 3, And a short circuit breaking switch SW2 are added.

At this time, the earth leakage cut-off switch SW2 is connected to the output terminal of the first electromagnetic contactor MC1 and the output terminal is coupled to the battery system 20. The residual voltage removing unit 140 is connected to the output terminal And the ground terminal. The residual voltage removing unit 140 has the same configuration as the residual voltage removing unit 140 described above with reference to FIG. For reference, in the case of using the second electromagnetic contactor MC2, the earth leakage cutoff switch SW2 is connected to the output terminal of the second electromagnetic contactor MC2, and the output terminal is coupled to the battery system 20. [

In this state, the first electromagnetic contactor MC1 is opened to remove the residual voltage, and the operation switch SW1 of the residual voltage removing unit 140 is turned on so that the output terminal of the electric leakage cutoff switch SW2 is closed Coupled to ground. However, when the first electromagnetic contactor MC1 is in the fused state, an external AC 380V voltage is applied to the input terminal of the earth leakage cutoff switch SW2 and a ground terminal voltage is applied to the output terminal. An overcurrent flows.

When an overcurrent flows in the electric leakage cut-off switch SW2, the electric leakage cutoff switch SW2 is opened so that the electric power is no longer supplied to the battery system 20.

Meanwhile, if the first electromagnetic contactor MC1 is not fused, the residual voltage removing unit 140 performs a function of removing residual voltage remaining after the completion of charging the battery as described above with reference to FIG.

In the case where the first and second electromagnetic contactors MC1 and MC2 are fused together, the first and second electromagnetic contactors MC1 MC2 are opened and the operation switch SW1 of the residual voltage removing unit 140 is turned on, an overcurrent flows to the electric leakage cutoff switch SW2 and the electric leakage cutoff switch SW2 is opened accordingly. However, if only the first electromagnetic contactor MC1 is fused, the second electromagnetic contactor MC3 is opened and the electric leakage cutoff switch SW2 is not tripped (that is, opened).

6 is a circuit diagram of a high voltage charging apparatus for a vehicle according to a fourth embodiment of the present invention. The high voltage charging apparatus 100 for a vehicle according to the fourth embodiment of the present invention shown in Fig. 6 is a modification of the third embodiment with reference to Fig. 5, in which a shunt switch SHT is added. At this time, the shunt switch SHT is operated under the control of the control unit 110 similarly to the first embodiment of the present invention with reference to FIG. 3 and mechanically connected to the mechanical switch MS, Is associated with the operation (trip operation) of the shunt switch SHT.

The residual voltage removing unit 140 and the earth leakage cutoff switch SW2 of the high voltage charging apparatus 100 for a vehicle according to the fourth embodiment are the same as the third embodiment described above when the first electromagnetic contactor MC1 is fused And the residual voltage removing unit 140 performs the same operation as that of the third embodiment when the first electromagnetic contactor MC1 is not fused.

However, when the fuse of the first electromagnetic contactor MC1 is detected in the state other than the charging state (i.e., the charging operation is not performed) or when the abnormal voltage is detected from the outside (for example, the charging cable side) And opens the mechanical switch MS under the control of the control unit 110. [

Hereinafter, the charging operation of the high voltage charging apparatus 100 for a vehicle according to the first embodiment of the present invention constructed as described above will be described with reference to FIG. 7 is a flowchart showing a high voltage charging method for a vehicle according to an embodiment of the present invention.

7, when the control unit 110 receives the charge start signal (S701), the control unit 110 transmits a close signal to the second electromagnetic contactor MC2 to close the second electromagnetic contactor MC2 (S702 ). At this time, the first electromagnetic contactor MC1 is in the open state, the mechanical switch MS is in the closed state, and the capacitor switch CS is in the open state.

The control unit 110 starts counting the time after transmitting a close signal to the second electromagnetic contactor MC2 at step S703 and counting the counted time at a set waiting time, (Step S704). Here, the first waiting time is a time considering the operation delay of the second electromagnetic contactor MC2.

The control unit 110 transmits a close signal to the first electromagnetic contactor MC1 when the counted time reaches the first waiting time (S705). The capacitor switch CS is closed during the delay time of the first electromagnetic contactor MC1 in response to the close signal provided to the first electromagnetic contactor MC1 A sub path (path1) is formed and the battery is charged through the sub path (path1) (S707). At this time, the auxiliary path path1 is a power supply path formed by the mechanical switch MS, the capacitor switch CS, the resistor R1 and the second electromagnetic contactor MC2.

Therefore, when the initial power is applied, power is applied through the auxiliary path (path1), and the inrush current is reduced as the current is limited by the resistor R1 at this time.

Then, the first electromagnetic contactor MC1 is closed according to the close signal of the first electromagnetic contactor MC1 provided by the control unit 110, and at the same time, the capacitor switch CS is opened (S708). The opening of the first electromagnetic contactor MC1 and the opening of the capacitor switch CS form a main path 2 between the power source 10 and the battery system 20, (S709). At this time, the main path path 2 is a power supply path formed by the mechanical switch MS, the first electromagnetic contactor and the second electromagnetic contactor MC2.

The control unit 110 receives the charging end signal from the battery system 20 during the charging of the battery through the main path path 2 in step S710 and outputs the charging completion signal to the first and second electromagnetic contactors MC1 and MC2, The first and second electromagnetic contactors MC1 and MC2 are simultaneously opened (S711).

Hereinafter, the operation of the vehicle high-voltage charging apparatus corresponding to the switch fusion bonding will be described with reference to Fig. Fig. 8 is a flow chart corresponding to fusion bonding of MC1 and MC2 of the high voltage charging apparatus for a vehicle according to the embodiment of the present invention. The high voltage charging apparatus for a vehicle at this time is the high voltage charging apparatus for a vehicle shown in Fig. 3 or Fig.

First, according to the description with reference to Fig. 7, even if only the first electromagnetic contactor MC1 is fused, the vehicle high voltage charging device 100 performs the normal charging operation by the second electromagnetic contactor MC2. That is, even if the first electromagnetic contactor MC1 is fused, the main path path 2 is formed by the second electromagnetic contactor MC2 so that the electric power provided by the power source 10 is provided to the battery system 20, Opening the second electromagnetic contactor MC2 later prevents further power from being supplied to the battery system 20.

When only the second electromagnetic contactor MC2 is fused, the vehicle high voltage charging device 100 performs a normal charging operation by the first electromagnetic contactor MC1. That is, even if the second electromagnetic contactor MC2 is fused, the main path path 2 is formed so that the electric power provided by the power source 10 is supplied to the battery system 20, and after the completion of the charging, So that no more power is supplied to the battery system 20.

Therefore, even when the first or second electromagnetic contactor MC1 or MC2 is fused, the charging operation of the vehicle high voltage charging device can supply electric power to the battery system 20 in accordance with the operation procedure with reference to Fig. However, if both the first and second electromagnetic contactors MC1 and MC2 are welded together, it is not possible to deal with fusion welding in the operation procedure with reference to Fig.

The high voltage charging apparatus 100 for a vehicle operates as described below with reference to Fig. 8 when both the first and second electromagnetic contactors MC1 and MC2 are fused, so that the first and second electromagnetic contactors MC1 and MC2, As shown in Fig.

Referring to FIG. 8, the controller 110 receives a charging completion signal from the battery system 20 (S801). In response to the charging completion signal, the controller 110 controls the first and second The first and second electromagnetic contactors MC1 and MC2 are simultaneously opened by transmitting an open signal to the two magnetic contactors MC1 and MC2 (S802).

The control unit 110 detects the output terminal voltages of the first and second electromagnetic contactors MC1 and MC2 through the voltage sensing unit 131 in step S803 and controls the output terminals of the first and second electromagnetic contactors MC1 and MC2 The voltage is compared with a set comparison voltage (e.g., AC 50V) to determine whether the first and second electromagnetic contactors MC1 and MC2 are fusion-bonded (S804).

If the output voltage of the first and second magnetic contactors MC1 and MC2 is equal to or higher than the reference voltage, the controller 110 determines that the first and second magnetic contactors MC1 and MC2 are fusion- The microcomputer 100 transmits a trip signal to the shunt switch SHT to trip the shunt switch SHT (S805).

The mechanical switch MS connected mechanically with the shunt switch SHT is tripped in response to the trip of the shunt switch SHT (S806). That is, the mechanical switch MS is opened in conjunction with the trip of the shunt switch SHT.

Therefore, as the mechanical switch MS is opened, the power path between the power source 10 and the battery system 20 is cut off and no further power is supplied to the battery system 20. [

Hereinafter, an embodiment in which the switch of the high voltage charging apparatus for a vehicle corresponds to the fusion and the removal of the residual voltage will be described with reference to Fig. FIG. 9 is an operation flow chart corresponding to fusing and residual voltage removal of a high voltage charging apparatus for a vehicle according to an embodiment of the present invention. The high voltage charging apparatus for a vehicle at this time is the high voltage charging apparatus shown in FIG. 9, the control unit 110 receives a charging end signal from the battery system 20 (S901), and supplies power to the battery system 20 in response to the charging end signal. (S902) by opening the first electromagnetic contactor MC1 by transmitting an open signal to the MC.

Then, the control unit 110 waits for a second waiting time (about 20 ms) in consideration of the operation delay of the first electromagnetic contactor MC1 (S903), and then, the operation switch SW1 of the residual voltage removing unit 140 And transmits a close signal to close the operation switch SW1 (S904). When the operation switch SW1 is closed, the main path (path 2) including the electric leakage cutoff switch SW2 is connected to the residual voltage removing unit 140, and the output end voltage of the electric leakage cutoff switch SW2 becomes the ground end voltage .

In this state, when the first electromagnetic contactor MC1 is in a normal state, i.e., in an unfused state, the first electromagnetic contactor MC1 is opened so that the main path 2 is separated from the power source, The remaining residual voltage is passed through the residual removal resistor R2 through the leakage current cut-off switch SW2 and the operation switch SW1, at which time the residual voltage is removed by the resistor R2 (S905).

On the other hand, when the first electromagnetic contactor MC1 is in a fused state, leakage occurs at both ends of the electric-discharge shielding switch SW2 to the resistor R2 of the residual voltage removing unit 140, The electric path formed by the mechanical switch MS, the first electromagnetic contactor MC1, and the battery system 20 is shut off (S906).

The control unit 110 waits for a third waiting time (for example, about 50 ms) after closing the operation switch SW1 so that the residual voltage can be sufficiently removed by the resistor R2 when the first electromagnetic contactor MC1 is not fused , The residual removal switch S2 is kept closed (S907). After the third waiting time, the controller 110 transmits an open signal to the operation switch SW1 to open the operation switch SW1 (S908).

In the above-described embodiment, the case where only the first electromagnetic contactor MC1 is used has been described. However, when the first and second electromagnetic contactors MC2 are used, And the residual voltage removing operation corresponding to the unfused adhesion of the first and second electromagnetic contactors MC2.

Hereinafter, the residual voltage removing operation of the high voltage charging apparatus for a vehicle will be described with reference to FIG. FIG. 10 is a flowchart of a residual voltage eliminating operation of the high voltage charging apparatus for a vehicle according to the embodiment of the present invention. The high voltage charging apparatus for a vehicle at this time is the high voltage charging apparatus shown in FIG.

Prior to the explanation, when the charging power is supplied to the battery system 20 and the voltage on the auxiliary path path1 is measured after completion of charging, the voltage is measured and the voltage on the auxiliary path path1, that is, the residual voltage, It causes the secondary accident such as fire. Therefore, it is necessary to remove the residual voltage after the end of charging the battery.

The control unit 110 receives a charge completion signal from the battery system 20 in step S1001 and outputs an open signal to the first electromagnetic contactor MC1 to open the first electromagnetic contactor MC1 in step S1002. Then, the control unit 110 waits for a second waiting time (for example, about 20 ms) in consideration of the operation delay of the first electromagnetic contact MC (S1003), and then the operation switch SW1 of the residual voltage removing unit 140 To close the operation switch SW1 (S1004).

When the operation switch SW1 is closed, the auxiliary path path1 is connected to the residual voltage removing unit 140, and the residual voltage remaining on the auxiliary path path1 is connected to the residual removing resistor R2 through the operation switch SW1, Where the residual voltage is removed by the resistor R2.

The control unit 110 waits for a third waiting time (for example, about 50 ms) after closing the operation switch SW1 to close the residual removal switch S2 until the residual voltage is sufficiently removed by the resistor R2 (S1005).

After the third waiting time, the controller 110 transmits an open signal to the operation switch SW1 to open the operation switch SW1 (S1006).

When the residual voltage is removed by the residual voltage removing unit 140, the operation switch SW1 is opened and the first and second electromagnetic contactors MC1 are opened to form a power path with the battery system 20 .

While the present invention has been particularly shown and described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It belongs to the scope.

100: vehicle AC charging device 10: power source
20: Battery system 110:
120: inrush current reduction unit 130: fusion welding counterpart
131: Voltage sensing unit 132: Fusing and compensation unit
140: Residual voltage remover MS: Mechanical switch
MC1: first electromagnetic contactor MC2: second electromagnetic contactor
CS: Capacitor switch SHT: Shunt switch
SW1: Operation switch SW2: Earth leakage cut-off switch

Claims (17)

A mechanical switch coupled to a power source providing charging power,
A first switch connected to an output terminal of the mechanical switch,
An inrush current reducing resistor connected in parallel to the first switch for reducing an inrush current generated upon initial application of the charging power,
A second switch having an input terminal connected to an output terminal of the first switch and an output terminal coupled to an input terminal of the battery system to correspond to fusion of the first switch,
A third switch connected in series to the inrush current reducing resistor and operative upon initial application of the charging power to cause the charging power passing through the mechanical switch to be supplied to the second switch through the inrush current reducing resistance, ,
The auxiliary switch is configured to form the auxiliary path composed of the mechanical switch, the third switch, the inrush current reducing resistor, and the second switch during the set time at the initial application of the charging power, A control unit for preventing the auxiliary path and the main path from being connected at the same time by forming a main path composed of a switch, the second switch,
And an output terminal connected to an output terminal of the second switch, an output terminal coupled to the ground terminal, and coupled to the ground terminal in accordance with the control of the control unit after completion of charging the battery to remove the residual voltage, , And
And an earth leakage cutoff switch connected in series to the second switch to form the main path together with the mechanical switch, the first switch and the second switch, and an output end connected to the input terminal of the residual voltage removing unit,
Wherein when the first and second switches are fusion-bonded after completion of charging the battery, the control unit operates the residual voltage eliminating unit to allow the overcurrent to flow through the electric leakage-blocking switch to open the electric leakage-blocking switch. delete The method of claim 1,
And a voltage sensing unit for sensing an output terminal voltage of the first switch and the second switch. 4. The method of claim 3,
And a fourth switch mechanically connected to the mechanical switch,
Wherein the control unit trips the fourth switch to open the mechanical switch when it is determined that the first switch and the second switch are fused after completion of battery charging. delete In paragraph 4
Wherein the controller controls on / off of the second switch when the first switch is fused when the charging power is applied to perform control corresponding to fusion of the first switch, And controls the on / off state of the third switch to perform control corresponding to fusion of the second switch when the first switch and the second switch are fused, . 4. The method of claim 3,
Wherein the first and second switches are electromagnetic contactors. 8. The method of claim 7,
And the third switch is a capacitor switch. 5. The method of claim 4,
And the fourth switch is a shunt switch. An input terminal connected to an output terminal of the first switch and an output terminal connected to an output terminal of the battery system, A third switch connected in series to the inrush current reducing resistance, a fourth switch mechanically connected to the mechanical switch, an input terminal connected to the input terminal of the first switch, And the output terminal is coupled to the ground terminal. After completion of charging the battery, the auxiliary path made up of the mechanical switch, the third switch, the inrush current reducing resistor, and the second switch is coupled to the ground terminal, And a second switch connected in series to the second switch, wherein the mechanical switch, the first switch, In the second group to form a main path, with the switch, the output of the high-voltage charging method a charging device including a short-circuit cut-off switch connected to an input of removing the residual voltage,
Closing the second switch according to a received charge start signal,
Waiting until a first waiting time corresponding to an operation delay of the second switch,
Closing the third switch after the first waiting time so that the battery is charged by the auxiliary path including the mechanical switch, the third switch, the inrush current reducing resistor, and the second switch;
Opening the third switch and closing the first switch,
Causing the battery to be charged to the main path including the mechanical switch, the first switch, and the second switch until charging is completed;
Simultaneously opening the first and second switches in response to the charge termination signal, and
When the first and second switches are fusion-bonded after completion of charging the battery, the residual voltage eliminating unit is operated to cause the overcurrent to flow to the earth leakage blocking switch, thereby opening the earth leakage blocking switch
Voltage charging method for a vehicle. delete 11. The method of claim 10,
And opening the mechanical switch by tripping the fourth switch when the first and second switches are in a fused state. 12. The method of claim 10 or 12,
Further comprising a residual voltage eliminating unit having an input terminal connected to the output terminal of the second switch and an output terminal coupled to the ground terminal,
Before simultaneously opening the first and second switches,
Opening the first switch in response to a charge termination signal, and
Operating the residual voltage eliminator to cause the output terminal of the second switch to be connected to the ground terminal so that the residual voltage is removed by the resistor
Further comprising the steps of: 12. The method of claim 10 or 12,
Wherein the first and second switches are electromagnetic contactors, the third switch is a capacitor switch, and the fourth switch is a shunt switch.
delete delete delete

Images