KR20200083871A - Integrated power supply for electric vehicle and method of controlling the same - Google Patents

Abstract

The present invention relates to an integrated power supply used in an electric vehicle. The integrated power supply includes: a first switch unit which receives a direct current (DC) and converts the same into an alternating current (AC); a second switch unit which receives an AC of a first voltage, which is a main battery charging voltage, and converts the same into a DC, or receives a DC of the main battery and converts the same into an AC; a third switch unit which receives an AC of a second voltage different from the first voltage and converts the same into a DC of the second voltage; a transformer which has one side connected to the first switch unit and the third switch unit, and the other side connected to the second switch unit, which receives the AC converted by the first switch unit, transforms the same into an AC of the first voltage, and outputs the AC to the second switch unit, and transforms a part of the AC into an AC of the second voltage and outputs the AC to the third switch unit, and which receives the AC converted by the second switch unit, transforms the same into an AC of the second voltage, and outputs the AC to the third switch unit; and a control unit which controls current conversion of the first switch unit or current conversion of the second switch unit based on a result obtained by sensing the state of a current output by the third switch unit and the state of a main battery. Therefore, while the main battery is charged, the integrated power supply enables power for the operation of vehicle load devices to be supplied from the main battery.

Description

INTEGRATED POWER SUPPLY FOR ELECTRIC VEHICLE AND METHOD OF CONTROLLING THE SAME

The present invention relates to a power supply device used in an electric vehicle.

In general, an electric vehicle may mean a vehicle that uses electric energy charged from a commercial power source as a power source. To this end, the electric vehicle may include a main battery charged with commercial power and a plurality of vehicle devices driven by the main battery.

However, a current supplied from a commercial power source for charging an electric vehicle usually has a very high voltage for rapid charging. Accordingly, the electric vehicle transforms the current of the commercial power into the charging voltage of the main battery, and inputs the transformed charging current back to the main battery to charge the main battery. The power supply that performs charging of the main battery as described above is called an On Board Charger (OBC).

Meanwhile, the main battery supplies power for operation of a plurality of load devices provided in the electric vehicle. However, since the main battery has a high voltage power of about 400V, a power supply device is provided that converts and supplies the high voltage power to the operating voltage of the load devices. Hereinafter, a power supply device that converts high voltage power to low voltage power is referred to as a low voltage dc-dc converter (LDC).

On the other hand, the OBC also has a function of a DC-DC converter that converts a commercial high voltage current to a charging voltage (400V) of the main battery, so the LDC and OBC have a similar configuration to each other. Accordingly, a plan to integrate the LDC and the OBC has been actively studied. In addition, as part of this study, an integrated power supply in which some of the circuit configuration of the OBC and LDC are shared with each other has appeared.

The integrated power supply allows the circuit shared through the connection of the switch to be selectively connected to the rest of the circuit of the OBC or LDC, so that the integrated power supply can selectively operate as either the OBC or the LDC. Accordingly, the OBC and the LDC are integrated with each other, but in this case, there is a problem that the operation power of the additional device is not supplied because the function of the OBC, that is, while the main battery is being charged, does not operate as the LDC.

On the other hand, the integrated power supply, despite being integrated, has a plurality of switches for each of the OBC input circuit, the LDC output circuit, and the shared circuit, and a feedback circuit including a control unit for controlling each switch for each switch for precise control Are provided. Accordingly, the integrated power supply has a problem in that its configuration is complicated and the efficiency of the control circuit is deteriorated due to multiple feedback controls.

An object of the present invention is to provide an integrated power supply that enables power to be supplied for operation of vehicle load devices from the main battery even while the main battery is being charged.

In addition, an object of the present invention is to provide an integrated OBC and LDC power supply having a simpler structure and improved control circuit efficiency.

According to an aspect of the present invention to achieve the above or other object, the integrated power supply device for an electric vehicle according to an embodiment of the present invention, the first switch unit for receiving a direct current and converting it to an alternating current, the main battery charging A second switch unit for receiving an alternating current of a first voltage that is a voltage and converting it into a direct current, or converting the direct current of the main battery into an alternating current, and an alternating current of a second voltage different from the first voltage A third switch unit that receives input and converts the DC voltage into a DC current, the first switch unit and the third switch unit are connected to one side, and the second switch unit is connected to the other side, and the first switch unit It receives the converted AC current, transforms it into an AC current of the first voltage, outputs it to a second switch part, and converts a part of it into an AC current of a second voltage, outputs it to a third switch part, and converts AC converted by the second switch. A transformer that receives current and transforms it into an alternating current of a second voltage and outputs it to a third switch unit, and detects the state of the current output from the third switch unit and the first battery based on the state of the main battery. It characterized in that it comprises a control unit for controlling the current conversion of the switch unit, or the current conversion of the second switch unit.

In one embodiment, the state of the main battery is whether or not the main battery is charged, and when the main battery is being charged, the controller controls the first switch unit according to the detected DC current state, and the When the main battery is not being charged, the second switch unit is controlled according to the sensed DC current state.

In one embodiment, the commercial AC current is further converted to a direct current (DC) and further includes a PFC (Power Factor Correction) conversion unit for input to the first switch unit, the control unit, the main based on the operation state of the PFC It is characterized by determining whether the battery is charged.

In one embodiment, when the alternating current converted by the first switch unit is input to the transformer, it operates as an On Board Charger (OBC) that charges the main battery, and simultaneously supplies operating power to the load of the electric vehicle. It is characterized in that it operates as a supplied low voltage DC-DC converter (LDC) and operates as the LDC when AC current converted by the second switch unit is input to the transformer.

In one embodiment, when the main battery is not being charged, the transformer cuts off between the transformer and the first switch unit, so that all AC current input from the second switch unit is transformed into the second voltage. Characterized as possible.

In one embodiment, according to the state of the main battery, and further comprising a memory having feedback tables including different control values corresponding to the input feedback (feed back) value, the control unit, the main battery It characterized in that the control information of the first switch unit or the second switch unit corresponding to the state of the DC current output from the third switch unit is generated from the feedback table corresponding to the state of.

According to an aspect of the present invention to achieve the above or other object, the control method of the integrated power supply device for an electric vehicle according to an embodiment of the present invention comprises: detecting a current state of a specific voltage output from a transformer; A first switch unit for detecting a state of the main battery of the electric vehicle, and converting a direct current applied from a commercial power source into an alternating current based on the state of the main battery and the sensed current state of a specific voltage, or Generating control information for controlling any one of the second switch units for converting the direct current input from the main battery into alternating current, and controlling the first switch unit or the second switch unit according to the generated control information Thus, it characterized in that it comprises the step of controlling the conversion of the DC current input for charging the main battery, or controlling the conversion of the DC current output from the main battery.

In one embodiment, the step of sensing the state of the main battery is determining whether the main battery is being charged, and the step of generating the control information is when the main battery is in the charged state. Generating first switch control information for controlling the first switch unit based on the current state of the specified voltage, and when the main battery is not in the charging state, based on the detected current state of the specific voltage It is a step of generating second switch control information for controlling the second switch unit, and the first switch control information and the second switch control information corresponding to the DC state of the specific second voltage are different.

In one embodiment, the conversion of a commercial AC current into a DC current further includes a PFC (Power Factor Correction) conversion unit input to the first switch unit, and detecting the state of the main battery comprises: It is characterized in that it is a step of determining whether the main battery is charged based on an operation state.

In one embodiment, the current of the specific voltage is output when the integrated power supply operates as a low voltage DC-DC converter (LDC), and is characterized in that it is a current supplied as a power source to the loader of the electric vehicle. .

When explaining the effect of the integrated power supply and its control method according to the present invention are as follows.

According to at least one of the embodiments of the present invention, when the alternating current converted by the PFC (Power Factor Correction) conversion unit is input, a part of the voltage is converted to the main battery charging voltage and output to the main battery, and the other part is a vehicle. When the OBC function is performed by transforming and outputting the voltage according to the operating power of the load device, there is an advantage of performing the function as an LDC at the same time as performing the OBC function.

In addition, according to at least one of the embodiments of the present invention, the present invention allows other switches to be controlled based on the state of the current output from the LDC output circuit, thereby reducing the number of feedback circuits to simplify the structure and to control the control circuit. It has the advantage of being able to further improve efficiency.

1 is a block diagram illustrating the configuration of an integrated power supply according to an embodiment of the present invention.
2 is a flowchart illustrating an operation process of the control unit of the integrated power supply according to an embodiment of the present invention.
3 is a conceptual diagram illustrating an example in which feedback control is performed by a control unit when the main battery is charged through the integrated power supply according to an embodiment of the present invention.
4 is a conceptual diagram illustrating an example in which feedback control is performed by a control unit when a main battery is discharged through an integrated power supply according to an embodiment of the present invention.
5 and 6 are diagrams illustrating a configuration of an integrated power supply and a conventional power supply according to an embodiment of the present invention, respectively.

Hereinafter, exemplary embodiments disclosed herein will be described in detail with reference to the accompanying drawings, but the same or similar reference numerals are assigned to the same or similar elements, and overlapping descriptions thereof will be omitted. The suffixes "modules" and "parts" for components used in the following description are given or mixed only considering the ease of writing the specification, and do not have meanings or roles that are distinguished from each other. In addition, in describing the embodiments disclosed in this specification, detailed descriptions of related well-known technologies are omitted when it is determined that they may obscure the gist of the embodiments disclosed herein. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the specification is not limited by the accompanying drawings, and all modifications included in the spirit and technical scope of the present invention , It should be understood to include equivalents or substitutes.

First, Figure 1 is a block diagram for explaining the configuration of an integrated power supply according to an embodiment of the present invention.

Referring to FIG. 1, the integrated power supply 1 according to an embodiment of the present invention includes a first switch unit 102 and a transformer 104, a second switch unit 106, a third switch unit 114, and Main battery 112 may be included. In addition, between the second switch unit 106 and the main battery 112 to control the operation of the battery current switch unit 108 and the battery current switch unit 108 for converting the current to the input current of the main battery 112 A battery current control unit 116 may be further included. In addition, a control unit 116 for controlling the first switch unit 102 or the second switch unit 106 and a memory 118 connected to the control unit 116 may be included.

The first switch unit 102 may receive the DC current 100 and convert the input DC current 100 into an AC current for transformer. Here, the DC current 100 may be a DC current input for charging the main battery. In more detail, the DC current 100 input to the first switch unit 102 may be a current obtained by converting an AC current supplied from a commercial power source into a DC current by PFC (Power Factor Correction, not shown). Therefore, in the case of the DC current 100 input to the first switch unit 102, it may be a current according to the voltage of the commercial power supply.

The first switch unit 102 may convert the input DC current to AC current for transformer. To this end, the first switch unit 102 may include a plurality of switches therein. Meanwhile, the first switch unit 102 may include a resonance circuit having a resonance inductor and a capacitor, and convert the converted AC current into AC current having a different frequency through the resonance circuit. Can.

Meanwhile, the transformer 104 may be connected to the first switch unit 102. In addition, an alternating current applied from the first switch unit 102 may be transformed into an alternating current having a different voltage. In this case, the transformer 104 may transform the AC current applied from the first switch unit 102 to a voltage corresponding to the charging voltage of the main battery 112. In addition, the transformed AC current may be output to the second switch unit 106.

In addition, when the AC current transformed through the transformer 104 is input, the second switch unit 106 may convert the input AC current into a DC current. Therefore, a direct current of a charging voltage capable of charging the main battery 250 may be generated. In addition, the generated DC current is supplied to the main battery 112 to charge the main battery 112.

However, the current transformed through the second switch unit 106 has a charging voltage of the main battery 112, but is converted from commercial current. Therefore, since the charging current and the current amount of the main battery 112 are different, the DC current converted by the second switch unit 106 may be input to the battery current switch unit 108. Then, the battery current switch unit 108 may convert the input DC current into a DC current having a current value of the main battery charging current and output the converted current. In addition, the current output through the battery current switch unit 108 may be input to the main battery 112 to charge the main battery 112.

Meanwhile, in this case, when the current converted by the battery current switch unit 108 is different from the current value of the main battery charging current, damage to the main battery 112 may occur. In order to prevent this, the integrated power supply 1 can precisely control the current input to the main battery 112 through feedback control. For such feedback control, the integrated power supply 1 according to an embodiment of the present invention senses the current state output from the battery current switch part 108, and the battery current switch part 108 according to the sensed current state It may include a battery current control unit 116 for controlling the.

Meanwhile, when the electric power charged in the main battery 112 is discharged, a direct current according to the output voltage of the main battery 112 may be output from the main battery 112 through the battery current switch unit 108. And it may be input to the second switch unit 106. Then, the second switch unit 106 may convert the direct current according to the output voltage of the main battery 112 into an alternating current and output it to the transformer 104.

Then, the transformer 104 can transform the AC current input from the second switch unit 106 into a current according to the operating voltage of the load device. In this case, if the operating voltage of the load device is 12V, the transformer 104 may transform the input AC current into an AC current of 12V and output it to the third switch unit 114.

In addition, the third switch unit 114 may receive an AC current having an operating voltage of the load device and convert it into a DC current. In addition, the converted DC current 120 may be output. Then, the DC current 120 output from the third switch unit 114 is supplied to the loader, and can be used as a power source for the load device.

As described above, the transformer 104 according to an embodiment of the present invention sequentially when the DC current is input to the first switch unit 102, the first switch unit 102, the transformer 104, the battery current switch unit The current may be applied to 108 to be driven by the OBC 140 where the main battery 112 is charged. In addition, the DC current applied from the main battery 112, the current is applied in the order of the battery current switch unit 108, the second switch unit 106, the transformer 104, the third switch unit 114 load device It can be driven as an LDC (130) to supply the operating power.

Therefore, the transformer 104, the second switch unit 106, and the battery current switch unit 108 may be shared circuits used both when driven as OBC and when driven by LDC. However, since the first switch unit 102 is used when a direct current is input for driving as an OBC, and the third switch unit 114 is used when a direct current is output as a load, the first switch unit 102 The configuration (for example, a plurality of switches included in the first switch unit 102 and a configuration of a driving unit for driving the plurality of switches) may be an OBC input circuit for operating as an OBC, and the third switch unit The configuration of 114 (eg, a plurality of switches included in the third switch unit 114 and a driving unit for driving the plurality of switches and a rectifying unit) may be an LDC output circuit for operating as an LDC.

Meanwhile, the transformer 104 may be connected to both the first switch unit 102 and the third switch unit 114. Therefore, when the AC current converted by the first switch unit 102 is input, a portion of the second switch unit 106 as well as the third switch unit 114 may be output. By the way, the transformer 104 includes inductors having different inductances connected to each of the first switch unit 102 and the third switch unit 114 on one side centering on the entire lead body, and the second switch unit 106 on the other side Since it includes an inductor connected to ), differently transformed currents may be output to the second switch unit 106 and the third switch unit 114.

In this case, a current according to the charging voltage of the main battery 112 may be output to the second switch unit 106, and an alternating current according to the operating voltage of the load device may be output to the third switch unit 114. In addition, since the third switch unit 114 converts the input AC current into DC current and outputs it, DC current according to the operating voltage of the load device may be output. In addition, the current output through the second switch unit 106 may be input to the main battery 112 as a charging current of the main battery 112. Therefore, the integrated power supply device 1 according to an embodiment of the present invention, when a direct current is input through the first switch unit 102, that is, when a commercial current is applied, the OBC charging the main battery 112 It can perform the function as and the function as LDC to supply operating power to the loader at the same time.

Meanwhile, the transformer 104 may further include a switch between the transformer 104 and the first switch unit 102. In this case, the switch formed between the transformer 104 and the first switch unit 102 may block between the transformer 104 and the first switch unit 102 when the main battery 112 is not being charged. have. Therefore, if the main battery 112 is not being charged, the AC current input from the second switch unit 106 to the transformer 104 can be transformed only into a current according to the operating voltage of the load device.

Meanwhile, the current output through the third switch unit 114 may be supplied to the loader as described above. In this case, if there is an abnormality in the state of the current supplied, it may cause circuit damage of the load device. Accordingly, the integrated power supply 1 according to an embodiment of the present invention can more accurately control the current output through the third switch unit 114 through feedback control.

Meanwhile, as described above, in the integrated power supply 1 according to the present invention, the current according to the operating voltage of the load device may be output through the third switch unit 114 both during charging and discharging of the main battery 112. Accordingly, the present invention can control the conversion state of the input current to generate the output current based on the state of the output current, that is, the current output from the LDC output circuit, for the feedback control. To this end, the integrated power supply unit 1 senses the state of the current output through the LDC output circuit, that is, the third switch unit 114, and based on the sensed current state, the first switch unit 102 or the second A control unit 116 for controlling the switch unit 106 may be included.

For example, when the main battery 112 is being charged, the DC current 100 input to the first switch unit 102 is transformed through the transformer 104 and output to the second switch unit 106 as described above. Can. In addition, some of the transformers may be transformed differently through the transformer 104 and output through the third switch unit 114. That is, when the main battery 112 is being charged, the output current 120 output through the LDC output circuit may be due to the input current 100 input to the first switch unit 102. Accordingly, the control unit 116 detects the state of the LDC output current 120 and, based on the sensed state, a first switch unit converting a high voltage DC current 100 converted from commercial power, that is, an OBC input current ( 102) to perform feedback control.

On the other hand, if the main battery 112 is not being charged, that is, when the main battery 112 is discharged, the DC current of the main battery 112 input to the second switch unit 106 as described above is the transformer 104 It can be transformed through. And it may be output through the third switch unit 114. That is, when the main battery 112 is not being charged, the output current 120 output through the LDC output circuit may be due to the output current of the main battery 112 input to the second switch unit 106. Accordingly, the control unit 116 detects the state of the LDC output current 120, and controls the feedback by controlling the second switch unit 106 that converts the DC current input from the main battery 112 based on the sensed state. Can be done.

That is, the control unit 116 may control different switch units according to the state of the main battery 112. In more detail, the control unit 116 may control the first switch unit 102 when the main battery 112 is charging, and the second switch unit 106 when the main battery 112 is not charging. Accordingly, even if the sensed state of the LDC output current is the same, different switch control information may be generated according to the state of the main battery 112.

Meanwhile, the switch control information may be information including at least one control value according to the sensed LDC output current 120 state. These control values can be classified according to the state of the main battery 112. For example, the control values are connected to the controller 116 in the form of a plurality of feedback tables according to the state of the main battery 112 and the input feedback value, that is, the sensed LDC output current 120 state. Can be stored in the memory 118.

Accordingly, the control unit 116 may first detect the state of the current 120 output from the third switch unit 114 and detect the state of the main battery 112. Then, control information is generated based on the sensed current state and control values of the feedback tables corresponding to the state of the main battery 112, and the first switch unit 102 and the second switch unit according to the generated control information ( 106).

2 is a flowchart for explaining the operation process of the control unit 116 in more detail. 3 and 4 are respectively fed back by the control unit 116 when the main battery 112 is charged and when the main battery 112 is discharged through the integrated power supply 1 according to an embodiment of the present invention. It is a conceptual diagram showing an example in which control is performed.

Referring to Figure 2, the control unit 116 of the integrated power supply 1 according to an embodiment of the present invention first detects the state of the LDC output current, that is, the current 120 output from the third switch unit 114 It can be done (S200). For example, the sensed current state may include at least one of a pulse duty ratio, a voltage, and an amount of current.

Here, if the main battery 112 is being charged, the OBC input current 100 may be input to the transformer 104 through the first switch unit 102 as shown in FIG. 3 (current flow: 300). . In addition, the OBC input current 100 may be transformed into a voltage for charging the main battery 112 and output to the second switch unit 106 (voltage flow: 310). And a part is branched and transformed into the operating voltage of the load device and output to the third switch unit 114 (voltage flow: 320).

On the other hand, if the main battery 112 is not being charged, the DC current of the main battery 112, as shown in FIG. 4, the transformer 104 through the battery current switch unit 110 and the second switch unit 106 Can be input (current flow: 400). In this case, the first switch unit 102 and the transformer 104 is cut off, the current output from the transformer 104 can be input only to the third switch unit 114.

Accordingly, regardless of whether the main battery 112 is being charged, the LDC output current 120 may be output through the third switch unit 114 in the integrated power supply 1 according to an embodiment of the present invention.

Meanwhile, when the state of the current output from the third switch unit 114 is detected, the controller 116 may determine the current state of the main battery 112 (S202). Here, step S202 may be a state of determining whether the main battery 112 is being charged. For example, the control unit 116 may determine whether the electric vehicle is currently in a charging state through the main control unit 116 that controls driving of the electric vehicle.

Alternatively, the controller 116 may determine whether the main battery 112 is currently being charged based on the driving state of the PFC converter. In this case, when the PFC converter converts a commercial AC current into a DC current, the controller 116 may determine that the main battery 112 is being charged. On the other hand, in other cases, that is, when the PFC converter does not convert the current, it may be determined that the main battery 112 is not charging.

On the other hand, as a result of the determination in step S202, if the state of the main battery 112 is'charging state', the controller 116 inputs the first switch unit 102 based on the sensed state of the LDC output current 120. Control information for controlling conversion of the current to be applied, that is, the OBC input current 100 may be generated (S204). Control values for generating the control information may be stored in the memory 118, the control unit 116 of the plurality of feedback tables provided in the memory 118, the main battery 112 is'charging state' Control values corresponding to at least one sensed current state may be detected from feedback tables corresponding to, and control information (first switch control information) may be generated based on the detected control values.

In addition, as shown in FIG. 3, the control unit 116 may control the first switch unit 102 to change the DC current conversion state of the OBC input current 100 (S206). For example, the LDC output circuit, that is, the third switch unit 114 may be a PWM (Pulse Width Modulation) converter. In this case, the third switch unit 114 may convert the AC current into a DC current using a pulse width modulation method. Therefore, the control unit 116, when the pulse, duty ratio, etc. of the DC current output through the third switch unit 114 does not satisfy a predetermined pulse and duty ratio, is converted in the first switch unit 102 The first switch unit 102 may be controlled to change the frequency of the alternating current. That is, the OBC input current 100 input to the first switch unit 102 according to the first switch control information may be converted into an alternating current having a different frequency.

On the other hand, as a result of the determination in step S202, if the main battery 112 is not being charged, the controller 116 is based on the sensed state of the LDC output current 120, the current input to the second switch unit 106 That is, it is possible to generate control information for controlling the conversion of the current input to the transformer 104 from the main battery 112 (S208). In this case, the controller 116 among the plurality of feedback tables provided in the memory 118, the main battery 112 corresponds to at least one sensed current state from the feedback tables corresponding to the'non-charging state' The control values may be detected and second switch control information may be generated based on the detected control values.

Then, as shown in FIG. 4, the second switch unit 106 is controlled to change the conversion state of the DC current input from the main battery 112 to the transformer 104 (S210 ). For example, when the third switch unit 114 is a PWM converter, the controller 116 may change the frequency of the AC current converted by the second switch unit 106 so that the second switch unit 106 Can be controlled. Accordingly, the direct current of the main battery 112 input to the second switch unit 106 may be converted into an alternating current having a different frequency according to the second switch control information.

Meanwhile, in the above description, the configuration of the integrated power supply 1 and the feedback control performed in the integrated power supply 1 according to an embodiment of the present invention have been described in detail. Hereinafter, a configuration of a conventional power supply device in which the integrated power supply 1 and the OBC and LDC are connected to the main battery according to an embodiment of the present invention will be compared and examined.

5 and 6 are diagrams illustrating a configuration of an integrated power supply and a conventional power supply according to an embodiment of the present invention, respectively.

First, referring to FIG. 5, FIG. 5 shows the configuration of the integrated power supply 1 according to an embodiment of the present invention.

As described above, the integrated power supply device 1 according to an embodiment of the present invention is a power supply circuit in which OBC and LDC are integrated, and one controller 116 outputs the output of the third switch unit 114, that is, the LDC output current. Depending on the state, the first switch unit 102 or the second switch unit 106 may be controlled. Therefore, the present invention, except for the battery current control unit 116, it is possible to feedback control capable of outputting a precise LDC current with only one control unit 116.

Meanwhile, FIG. 6 is a diagram showing an example of a conventional electric vehicle power supply device in which the OBC and the LDC are respectively connected to the main battery.

Referring to FIG. 6, in the conventional power supply unit, the OBC including the first transformer unit 602a and the second switch unit 604 in the first switch unit 600 controls the input current of the main battery 112. Can be connected to the battery current switch unit 108. Therefore, when the OBC input current 100 is input through the first switch unit 600, the transformed DC current may be input to the main battery 120 through the battery current switch unit 108.

In addition, the main battery 112 may be connected to an LDC including a second transformer 602b and a third switch unit 608. Therefore, the current output from the main battery 112 may be transformed and output to the DC current 120 of the operating voltage of the load device through the second transformer 602b and the third switch unit 608.

On the other hand, in the case of such a normal power supply, as shown in FIG. 6, the OBC and the LDC are respectively driven separately. Therefore, the input current 100 of the OBC does not affect the output current 120 of the LDC. Therefore, in the case of such a normal power supply, in order to control the feedback for more precise output, it is necessary to configure a feedback circuit in the OBC and LDC, respectively.

Therefore, as shown in FIG. 6, the conventional power supply device senses the current output from the second switch unit 604, that is, the state of the OBC output current, and the first switch unit 600 or the second switch according to the sensed current. The first control unit 606 that controls the unit 604 and the current output from the third switch unit 608, that is, detects the state of the LDC output current and controls the third switch unit 608 according to the sensed current A third control unit 610 is to be provided, respectively. Accordingly, a sensor for sensing a current state, a transmission line for transmitting control information of the control unit, and an increase in the number of control units, which may result in circuit complexity and deterioration in efficiency of the control circuit.

On the other hand, in the case of a conventional integrated power supply that allows the circuit shared through the connection of the switch to be selectively connected to the remaining circuits of the OBC or the LDC, it can selectively operate as either the OBC or the LDC. Therefore, in the conventional integrated power supply, as shown in FIG. 6, for feedback control, feedback circuits must be configured in the OBC and LDC, respectively.

On the other hand, the integrated power supply 1 according to an embodiment of the present invention can operate as an LDC while operating as an OBC as described above. Accordingly, the controller 116 can always sense the state of the LDC output current, and it is possible to control the feedback according to the state of the main battery 112 based on the sensed state. Therefore, as described in FIG. 5, since the feedback control through one control unit 116 is possible, the circuit complexity can be greatly reduced and the efficiency of the control circuit can be greatly improved.

The above-described present invention can be embodied as computer readable codes on a medium on which a program is recorded. The computer-readable medium includes all types of recording devices in which data that can be read by a computer system are stored. Examples of computer-readable media include a hard disk drive (HDD), solid state disk (SSD), silicon disk drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, and optical data storage device. This includes, and is also implemented in the form of a carrier wave (eg, transmission over the Internet). Also, the computer may include a control unit 116. Therefore, the above detailed description should not be construed as limiting in all respects, but should be considered as illustrative. The scope of the invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (10)

In the integrated power supply for an electric vehicle,
A first switch unit that receives a DC current and converts it into an AC current;
A second switch unit for receiving an alternating current of a first voltage that is a main battery charging voltage and converting it into a direct current, or receiving a direct current of the main battery and converting it into an alternating current;
A third switch unit that receives an alternating current of a second voltage different from the first voltage and converts it into a direct current of the second voltage;
The first switch unit and the third switch unit are connected to one side, and the second switch unit is connected to the other side, receives the alternating current converted by the first switch unit, transforms the alternating current into an alternating current of the first voltage. 2 Output to the switch unit, and convert some of it to an alternating current of a second voltage to output it to a third switch unit, receive the alternating current converted by the second switch, transform it into an alternating current of a second voltage, and output it to the third switch unit Transformers;
And a control unit for controlling the current conversion of the first switch unit or the current conversion of the second switch unit based on a result of sensing the state of the current output from the third switch unit and the state of the main battery. Integrated power supply. According to claim 1,
The state of the main battery is whether the main battery is charged,
The control unit,
When the main battery is being charged, the first switch unit is controlled according to the sensed DC current state, and if the main battery is not being charged, the second switch unit is controlled according to the sensed DC current state. Integrated power supply. According to claim 2,
It further includes a PFC (Power Factor Correction) conversion unit for converting a commercial AC current into a DC current and inputting it to the first switch unit,
The control unit,
Integrated power supply, characterized in that for determining whether the main battery is charged based on the operation state of the PFC. According to claim 1,
When the alternating current converted by the first switch unit is input to the transformer, it operates as an On Board Charger (OBC) for charging the main battery, and at the same time, an LDC (Low Voltage) that supplies operating power to the load of the electric vehicle. DC-DC converter),
When the AC current converted by the second switch unit is input to the transformer, the integrated power supply, characterized in that operating as the LDC. According to claim 1, wherein the transformer,
When the main battery is not being charged, the integrated power supply, characterized in that to cut off between the transformer and the first switch unit, all the alternating current input from the second switch unit to the second voltage. According to claim 1,
According to the state of the main battery, further comprising a memory having feedback tables including different control values corresponding to the input feedback (feed back) value,
The control unit,
And generating control information of the first switch unit or the second switch unit corresponding to the state of the DC current output from the third switch unit from the feedback table corresponding to the state of the main battery. In the control method of the integrated power supply for an electric vehicle,
Sensing a current state of a specific voltage output from the transformer;
Detecting a state of the main battery of the electric vehicle;
Based on the state of the main battery and the current state of the detected specific voltage, a first switch unit for converting a DC current applied from a commercial power source into an AC current or a DC current input from the main battery as an AC current Generating control information for controlling any one of the second switch units to convert; And,
Controlling the conversion of the DC current input for charging the main battery or controlling the conversion of the DC current output from the main battery by controlling the first switch unit or the second switch unit according to the generated control information The control method of the integrated power supply comprising a step. The method of claim 7,
The step of detecting the state of the main battery,
Determining whether the main battery is being charged,
The step of generating the control information,
When the main battery is in a charged state, generating first switch control information for controlling the first switch unit based on the detected current state of the specific voltage,
When the main battery is not in a charged state, generating second switch control information for controlling the second switch unit based on the detected current state of the specific voltage,
The control method of the integrated power supply, characterized in that the first switch control information and the second switch control information corresponding to the DC state of the specific second voltage are different. The method of claim 8,
It further includes a PFC (Power Factor Correction) conversion unit for converting a commercial AC current into a DC current and inputting it to the first switch unit,
The step of detecting the state of the main battery,
And determining whether to charge the main battery based on the operation state of the PFC. The method of claim 7, wherein the current of the specific voltage,
A control method of an integrated power supply, characterized in that the integrated power supply is output when operating as a low voltage DC-DC converter (LDC) and is supplied as a power source to a loader of the electric vehicle.

Images