KR102568431B1 - Method and apparatus for charging a battery - Google Patents

Abstract

According to an embodiment, a battery charging method and apparatus for performing charging of the battery by monitoring the voltage of the battery and applying different control signals to a module according to the voltage of the battery are disclosed. More specifically, a battery charging method and apparatus for charging a battery while controlling a voltage applied to one of a primary coil and a secondary coil included in a transformer according to a control signal are disclosed.

Description

Battery charging method and apparatus {Method and apparatus for charging a battery}

In this disclosure, a method and apparatus for charging a battery are disclosed. Specifically, a method and apparatus for charging a battery through voltage transformation are disclosed.

In the United Nations Climate Change Convention, etc., countries around the world, including Korea, are obliged to reduce greenhouse gases. Accordingly, the Korean government is seeking various measures to reduce greenhouse gases as a policy. In particular, the government imposes various regulations on automobiles, which are one of the biggest causes of greenhouse gas emissions. In response, the automobile industry responds to electric vehicles (EV), hybrid electric vehicles (HEV), The development of plug-in hybrid electric vehicles (PHEVs) is being accelerated.

An electric vehicle or the like stores electrical energy in a battery, which is a secondary battery, and converts the electrical energy into power energy using a motor. At this time, the method of charging the battery with electric energy is the rapid charging method in which DC high voltage power (about 50 kW or more) is directly applied to the battery to charge it, and the slow charging method in which AC power with commercial AC voltage (about 3 ~ 6 kW) is applied. There are charging methods.

However, the voltage of electric power normally obtained in a household is different from the voltage of a battery mounted in an electric vehicle. Therefore, in order to widely commercialize and practically utilize eco-friendly electric vehicles, a charging device that can efficiently convert commercial AC power obtained at home into high-voltage direct-current power, a so-called "on-board charger; OBC)" is continuously being developed.

The present disclosure may provide a method and apparatus for charging a battery by more efficiently distributing voltage. For example, a method and apparatus for more efficiently charging a battery through a method of distributing the voltage according to the voltage of the battery may be provided. The technical problem to be solved is not limited to the technical problems as described above, and various technical problems may be further included within a range obvious to those skilled in the art.

A battery charging method according to a first aspect includes monitoring a voltage of the battery connected to a secondary coil side of a transformer including a primary coil and a secondary coil; applying a control signal determined according to the voltage of the battery to a module connected to a stop of the primary coil composed of a first coil and a second coil connected in series; and charging the battery while maintaining a voltage applied to the second coil to a predetermined value or less according to the control signal.

In addition, in the step of applying the control signal, when the voltage of the battery is equal to or higher than the preset value, a control signal requesting to maintain the voltage applied to the second coil to the preset value or less may be applied.

Also, the module may include an FET.

In addition, the module may include a first FET and a second FET, and the first FET and the second FET may be connected in series.

Also, a direction of a diode included in the first FET and a direction of a diode included in the second FET may be opposite to each other.

In addition, the charging of the battery may include applying a high signal to the first FET and the second FET when the voltage of the battery is greater than or equal to a predetermined value, thereby generating a voltage applied to the second coil. The battery may be charged while maintaining a value equal to or less than a preset value.

In addition, the step of charging the battery may include applying a low signal to the first FET and the second FET when the voltage of the battery is less than a predetermined value, so that the first FET and the second FET 2 The battery may be charged while keeping the FET open.

Also, the battery charging device according to the second aspect includes a receiver for receiving a voltage of the battery connected to a secondary coil side of a transformer including a primary coil and a secondary coil; a module connected to the middle of the primary coil composed of a first coil and a second coil connected in series; and monitoring the voltage of the battery received by the receiver, applying a control signal determined according to the voltage of the battery to the module, and maintaining the voltage across the second coil below a preset value according to the control signal. A processor for charging the battery may be included.

In addition, the module includes a first FET and a second FET, the first FET and the second FET are connected in series, the direction of the diode included in the first FET and the diode included in the second FET directions may be opposite to each other.

In addition, when the voltage of the battery is greater than or equal to a predetermined value, the processor applies a high signal to the first FET and the second FET to maintain the voltage applied to the second coil to a predetermined value or less. The battery may be charged.

In addition, the third aspect may provide a computer-readable recording medium on which a program for executing the method of the first aspect is recorded on a computer.

In this disclosure, a method and apparatus for charging a battery are disclosed. Specifically, a method and apparatus for charging a battery through voltage transformation are disclosed.

1 is a diagram illustrating an example in which a battery charging device according to an exemplary embodiment is used.
2 is a block diagram illustrating an example of a configuration of a battery charging device according to an exemplary embodiment.
3 is a block diagram illustrating an example in which a battery charging device operates according to an exemplary embodiment.
4 is a block diagram illustrating an example in which the battery charging device operates by applying different control signals for each section when the battery voltage is low according to an embodiment.
5 is a block diagram illustrating an example in which a battery charging device operates by applying a predetermined control signal when a battery voltage is low according to an exemplary embodiment.
6 is a block diagram illustrating an example in which a battery charging device operates when a battery voltage is high according to an exemplary embodiment.
7 is a block diagram illustrating an example in which a battery charging device including a plurality of modules operates according to an exemplary embodiment.
8 is a flowchart illustrating an example in which a battery charging device performs charging of a battery while maintaining a voltage applied to a second coil to a predetermined value or less according to a control signal according to an embodiment.

The terms used in the embodiments have been selected from general terms that are currently widely used as much as possible while considering the functions in the present invention, but they may vary according to the intention of a person skilled in the art or precedent, the emergence of new technologies, and the like. In addition, in a specific case, there is also a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, not simply the name of the term.

In the entire specification, when a part is said to "include" a certain component, it means that it may further include other components, not excluding other components unless otherwise stated. In addition, as described in the specification, "... wealth", "… A term such as “module” refers to a unit that processes at least one function or operation, and may be implemented as hardware or software or a combination of hardware and software.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a diagram illustrating an example in which a battery charging device 100 according to an embodiment is used.

In the charging device for an electric vehicle according to an embodiment, a boost circuit capable of only voltage boosting may be used as a power factor correction (PFC) circuit. In addition, the output voltage (Vdc) of the PFC circuit may be greater than or equal to a preset value (eg, 380V). However, depending on the state of charge, the voltage of the battery may fluctuate within a specific range (eg DC 200 to 450V). In the electric vehicle charging device according to an embodiment, the On / Off cycle (duty ratio) of the PWM signal input to the DC / DC converter so that the charging voltage (Vo) almost matches the voltage of the battery within a predetermined range. ratio)) can be changed.

Meanwhile, a charging device for an electric vehicle according to an embodiment may mainly use a full bridge converter as a DC/DC converter. In addition, according to an embodiment, device parameters of passive components included in the full bridge converter may be designed such that the efficiency of the charging system is maximized when the duty ratio of the PWM signal input to the DC/DC converter is maximized.

A basic circuit of the high-capacity OBC according to an embodiment may be a half bridge LLC resonant converter. Alternatively, in order to realize high-capacity fast charging, an actual circuit may be configured as a 3-phase circuit. In addition, the inverter is basically a three-phase circuit, and an Insulated Gate Bipolar Mode Transistor (IGBT) with a built-in body diode is driven as a switch to operate to convert direct current (DC) into alternating current (AC). The inverter may convert the voltage from the high-capacity battery into alternating current and supply it to the vehicle motor.

In particular, in the case of a single-stage PFC in an on board charger (OBC), the reverse voltage may be designed to be maintained above a certain value in order to maintain the ripple current within a predetermined range. Also, according to an embodiment, the battery charging device 100 may be included in the OBC. Hereinafter, specific operations of the battery charging device 100 will be described.

2 is a block diagram illustrating an example of a configuration of a battery charging device 100 according to an exemplary embodiment.

As shown in FIG. 2 , the battery charging device 100 may include a receiver 110 , a processor 120 and a module 130 .

However, those skilled in the art can understand that other general-purpose components other than the components shown in FIG. 2 may be further included in the battery charging device 100. For example, the battery charging device 100 may further include a power source 140 or a battery 150 . Alternatively, in the case of other embodiments, those skilled in the art may understand that some of the components shown in FIG. 2 may be omitted.

The receiver 110 according to an embodiment may receive the voltage of the battery 150. The transformer included in the battery charging device 100 according to an embodiment may include a primary coil and a secondary coil, and the module 130 may be connected to the primary coil side and the battery 150 to the secondary coil side. there is.

The module 130 according to an embodiment may be connected to a stop of a primary coil composed of a first coil and a second coil connected in series. For example, one of the two connection lines included in the module 130 may be connected to a point where the first coil and the second coil are connected.

The processor 120 according to an embodiment monitors the voltage of the battery received by the receiver, applies a control signal determined according to the voltage of the battery to the module, and sets the voltage applied to the second coil to a predetermined value or less according to the control signal. It is possible to charge the battery while maintaining

3 is a block diagram illustrating an example in which the battery charging device 100 operates according to an exemplary embodiment.

As shown in FIG. 3 , the battery charging device 100 may include a receiver 110 , a processor 120 , a module 130 , a power source 140 and a transformer 300 .

However, those skilled in the art can understand that other general-purpose components other than the components shown in FIG. 3 may be further included in the battery charging device 100. For example, the battery charging device 100 may further include a battery 150 . Alternatively, in the case of other embodiments, those skilled in the art may understand that some of the components shown in FIG. 3 may be omitted.

3 to 6, the winding ratio between the primary coils 310 and 320 and the secondary coil 330 is 2:1, and the winding ratio between the first coil 310 and the second coil 320 according to an embodiment. Although the case of 13:7 is disclosed, this winding ratio is only an example, and the battery charging device 100 may operate with other winding ratios.

The receiver 110 according to an embodiment may receive the voltage of the battery 150. Referring to FIG. 3 , the transformer 300 included in the battery charging device 100 according to an embodiment includes primary coils 310 and 320 and a secondary coil 330, and the module 130 includes 1 To the side of the secondary coils 310 and 320 , the battery 150 may be connected to the side of the secondary coil 330 .

Transformer 300 according to an embodiment may include primary coils 310 and 320 and secondary coil 330 . Also, the primary coils 310 and 320 may include a first coil 310 and a second coil 320 . The module 130 according to an embodiment may be connected to the middle of the primary coils 310 and 320 including the first coil 310 and the second coil 320 connected in series. For example, one of the two connection lines included in the module 130 may be connected to a point where the first coil 310 and the second coil 320 are connected.

The receiver 110 according to an embodiment may receive the voltage of the battery 150 and transmit it to the processor 120 . Although the receiver 110 is disclosed as a separate component in FIG. 3 , the receiver 110 may be included as one component of the processor 120 depending on an implementation method.

The module 130 according to an embodiment may operate according to a control signal applied by the processor 120 . For example, the module 130 may be shorted when the processor 120 applies a high signal, and may open when a low signal is applied. The meaning of open according to an embodiment may be open in one direction or open in both directions. According to an embodiment, when the module 130 is shorted according to a control signal applied by the processor 120, both terminals of the second coil 320 may be shorted. In this case, the voltage applied to both terminals of the second coil 320 may be maintained below a predetermined value (eg, 0.1V), and ideally, the voltage applied to both terminals of the second coil 320 is 0V. can However, the voltage applied to both terminals of the second coil 320 may not be zero due to the resistance of the actual wire.

The processor 120 according to an embodiment monitors the voltage of the battery 150 received by the receiver 110, applies a control signal determined according to the voltage of the battery 150 to the module 130, and transmits the control signal to the control signal. Accordingly, the battery 150 may be charged while maintaining the voltage across the second coil 320 below a predetermined value.

The processor 120 according to an embodiment may monitor the voltage of the battery 150. The voltage of the battery 150 may be received through the receiver 110 . The receiver 110 according to an embodiment may be included in the processor 120. The processor 120 may determine whether the voltage of the battery 150 is greater than or equal to a predetermined value. For example, the processor 120 may determine whether the voltage of the battery 150 is 280V or higher.

The processor 120 according to an embodiment may apply a control signal determined according to a result of monitoring the voltage of the battery 150 to the module 130 . For example, when the voltage of the battery 150 is greater than or equal to a predetermined value, the processor 120 may apply a control signal to the module 130 requesting that the voltage applied to the second coil 320 be maintained below a predetermined value. can As another example, when the voltage of the battery 150 is less than a predetermined value, the processor 120 may apply a control signal requesting that the voltage applied to the second coil 320 not be controlled to the module 130 . For example, the processor 120 applies a high signal to the module 130 when the voltage of the battery 150 is greater than or equal to a preset value, and applies a low signal to the module 130 when the voltage of the battery 150 is less than the preset value ( 130) can be applied.

The module 130 according to an embodiment may include one or more devices (eg, Field Effect Transistor (FET)). For example, module 130 may include two FETs. In this case, the first FET and the second FET may be connected in series. In addition, the direction of the diode included in the first FET and the direction of the diode included in the second FET may be opposite to each other.

The processor 120 according to an embodiment applies a high signal to the first FET and the second FET included in the module 130 when the voltage of the battery 150 is equal to or greater than a predetermined value (eg, about 280V) to generate the second coil. The battery 150 may be charged while maintaining the voltage applied to 320 to a predetermined value or less.

The processor 120 according to an embodiment applies a low signal to the first FET and the second FET included in the module 130 when the voltage of the battery 150 is less than a predetermined value (eg, about 280V) to generate the second coil. Charging of the battery 150 may be performed without additional control of the voltage across 320 . In this case, the battery 150 may be charged while the first FET and the second FET are maintained in an open state.

4 is a block diagram illustrating an example in which the battery charging device 100 operates by applying different control signals for each section when the voltage of the battery 150 is low according to an embodiment.

Referring to FIG. 4 , an example in which the battery charging device 100 operates when the voltage of the battery 150 is less than a predetermined value (eg, 200V to 280V) is illustrated. When the voltage of the battery 150 is less than a predetermined value, the processor 120 may monitor the voltage of the battery 150 and apply a first control signal to the module 130 . Specifically, signals applied to the first FET (Q5) and the second FET (Q6) may be the first control signal. As can be seen in FIG. 4 , the first control signal may be high in the first period 410 and low in the second period 420 . When the first control signal is applied to the module 130, the module 130 may operate in an open state in the second period 420 when the PWM is low. Accordingly, the reverse voltage applied to the inductor 350 by the battery 150 may be a voltage corresponding to twice the voltage output from the battery 150 . For example, when the voltage of the battery 150 is about 200V, the reverse voltage across the inductor 350 may be about 400V. Accordingly, even when the voltage of the battery 150 is at the lowest level (eg, 200V), the reverse voltage across the inductor 350 may be greater than or equal to a preset value (eg, 340V).

Even when the voltage of the battery 150 is low, since the winding ratio of the transformer 300 operates at 2:1 in the second section 420, the reverse voltage applied to the inductor 350 can be maintained above a preset value, Accordingly, the ripple current does not diverge or disappear, and can be maintained within a predetermined range.

Also, the direction of the diode included in the first FET (Q5) and the direction of the diode included in the second FET (Q6) may be opposite to each other. Since the direction of the diode included in the first FET (Q5) and the direction of the diode included in the second FET (Q6) are opposite to each other, a low signal is applied to the first FET (Q5) and the second FET (Q6) When it is, the module 130 may operate in an open state.

5 is a block diagram illustrating an example in which the battery charging device 100 operates by applying a predetermined control signal when the voltage of the battery 150 is low according to an embodiment.

Referring to FIG. 5 , an example in which the battery charging device 100 operates when the voltage of the battery 150 is less than a predetermined value (eg, 200V to 280V) is illustrated. When the voltage of the battery 150 is less than the predetermined value, the processor 120 may monitor the voltage of the battery 150 and apply a second control signal to the module 130 . Specifically, signals applied to the first FET (Q5) and the second FET (Q6) may be the second control signal. As can be seen in FIG. 5 , the second control signal may be low in both the first period 410 and the second period 420 . When the second control signal is applied to the module 130, the module 130 may operate in an open state during the first period 410 and the second period 420. Accordingly, the reverse voltage applied to the inductor 350 by the battery 150 may be a voltage corresponding to twice the voltage output from the battery 150 . For example, when the voltage of the battery 150 is about 200V, the reverse voltage across the inductor 350 may be about 400V. Accordingly, even when the voltage of the battery 150 is at the lowest level (eg, 200V), the reverse voltage across the inductor 350 may be greater than or equal to a predetermined value (eg, 340V).

Even when the voltage of the battery 150 is low, since the winding ratio of the transformer 300 operates at 2:1 in the entire period, the reverse voltage applied to the inductor 350 can be maintained above a predetermined value, and thus the ripple current does not diverge or disappear, and may be maintained within a predetermined range.

Also, the direction of the diode included in the first FET (Q5) and the direction of the diode included in the second FET (Q6) may be opposite to each other. Since the direction of the diode included in the first FET (Q5) and the direction of the diode included in the second FET (Q6) are opposite to each other, a low signal is applied to the first FET (Q5) and the second FET (Q6) When it is, the module 130 may operate in an open state.

6 is a block diagram illustrating an example in which the battery charging device 100 operates when the voltage of the battery 150 is high according to an exemplary embodiment.

Referring to FIG. 5 , an example in which the battery charging device 100 operates when the voltage of the battery 150 is greater than or equal to a predetermined value (eg, 280V to 450V) is illustrated. When the voltage of the battery 150 is equal to or greater than a predetermined value, the processor 120 may monitor the voltage of the battery 150 and apply a third control signal to the module 130 . Specifically, the signal applied to the first FET (Q5) and the second FET (Q6) may be the third control signal. As can be seen in FIG. 6 , the third control signal may be high in both the first period 410 and the second period 420 . When the third control signal is applied to the module 130, the module 130 may operate in a shorted state in the first period 410 and the second period 420. Accordingly, the reverse voltage applied to the inductor 350 by the battery 150 may be a voltage corresponding to 1.3 times the voltage output from the battery 150 . For example, when the voltage of the battery 150 is about 450V, the reverse voltage across the inductor 350 may be about 585V. Accordingly, even when the voltage of the battery 150 is at the highest level (eg, 450V), the reverse voltage across the inductor 350 may be less than or equal to a preset value (eg, 585V).

When the voltage of the battery 150 is high, since the winding ratio of the transformer 300 operates at 1.3:1 in the entire section, the reverse voltage applied to the inductor 350 can be maintained below a preset value, and thus, the device The maximum voltage value applied may be reduced. Therefore, the maximum value of the reverse voltage that each device (eg, Q1 to Q4) must withstand can be reduced. For example, when the maximum voltage of the battery 150 is 450V, the maximum voltage output from the primary coil of the transformer 300 is 900V when the module 130 is not present, but when the module 130 is present, the transformer 300 ), the maximum voltage output from the primary coil may be 585V.

Therefore, when the module 130 is included, since specifications required for elements included in the battery charging device 100 may be lowered, the battery charging device 100, PFC, and OBC may be implemented at a lower price.

7 is a block diagram illustrating an example in which the battery charging device 100 including a plurality of modules 131 and 132 operates according to an exemplary embodiment.

As shown in FIG. 7, the battery charging device 100 includes a receiver 110, a processor 120, a first module 131, a second module 132, a power source 140, and a transformer 300. can do.

However, those skilled in the art can understand that other general-purpose components other than the components shown in FIG. 7 may be further included in the battery charging device 100. For example, the battery charging device 100 may further include a battery 150 . Alternatively, in the case of other embodiments, those skilled in the art may understand that some of the components shown in FIG. 7 may be omitted.

7, the winding ratio between the primary coils 810, 820, and 830 and the secondary coil 840 is 2:1 according to an embodiment, and the first coil 810, the second coil 820, and the third coil Although the case where the winding ratio between 830 is 10:5:5 is disclosed, this winding ratio is only an example, and the battery charging device 100 may operate with other winding ratios.

As shown in FIG. 7 , the primary coils 810 , 820 , and 830 may be divided into three or more coil units. In addition, the battery charging device 100 may operate through two or more modules 131 and 132 .

The receiver 110 according to an embodiment may receive the voltage of the battery 150. Referring to FIG. 7 , the transformer 300 included in the battery charging device 100 according to an embodiment includes primary coils 810, 820, and 830 and a secondary coil 840, and the first module ( 131) and the second module 132 may be connected to the primary coils 810, 820, and 830, and the battery 150 may be connected to the secondary coil 840.

The transformer 300 according to an embodiment may include primary coils 810 , 820 , and 830 and a secondary coil 840 . Also, the primary coils 810 , 820 , and 830 may include a first coil 810 , a second coil 820 , and a third coil 830 . The first module 131 according to an embodiment may be connected to a node connecting the first coil 810 and the second coil 820 connected in series. One of the two connection lines included in the first module 131 may be connected to a point where the first coil 810 and the second coil 820 are connected.

The second module 132 according to an embodiment may be connected to a node connecting the second coil 820 and the third coil 830 connected in series. One of the two connection lines included in the second module 132 may be connected to a point where the second coil 820 and the third coil 830 are connected.

The receiver 110 according to an embodiment may receive the voltage of the battery 150 and transmit it to the processor 120 . Although the receiver 110 is disclosed as a separate component in FIG. 8 , the receiver 110 may be included as one component of the processor 120 depending on an implementation method.

The first module 131 and the second module 132 according to an embodiment may operate according to a control signal applied by the processor 120 . For example, the first module 131 and the second module 132 may be shorted when the processor 120 applies a high signal, and open when a low signal is applied. The meaning of open according to an embodiment may be open in one direction or open in both directions.

According to an embodiment, when the first module 131 is shorted according to the control signal applied by the processor 120, both terminals of the second coil 820 and the third coil 830 may be shorted. In this case, the voltage applied to both terminals of the second coil 820 and the third coil 830 may be maintained below a predetermined value (eg, 0.1V), and ideally, the second coil 820 and the second coil 820 A voltage applied to both terminals of the three coils 830 may be 0V. However, the voltage applied to both terminals of the second coil 820 and the third coil 830 may not be zero due to the resistance of the actual wire.

According to an embodiment, when the second module 132 is shorted according to the control signal applied by the processor 120, both terminals of the third coil 830 may be shorted. In this case, the voltage applied to both terminals of the third coil 830 may be maintained below a predetermined value (eg, 0.1V), and ideally, the voltage applied to both terminals of the third coil 830 is 0V. can However, the voltage applied to both terminals of the third coil 830 may not be zero due to the resistance of the actual wire.

The processor 120 according to an embodiment monitors the voltage of the battery 150 received by the receiver 110, and determines the voltage of the battery 150 to the first module 131 and/or the second module 132. A control signal determined according to the control signal is applied, and the battery 150 is charged while maintaining the voltage applied to the second coil 820 and the third coil 830 or the third coil 830 to a predetermined value or less according to the control signal. can be performed.

The processor 120 according to an embodiment may monitor the voltage of the battery 150. The voltage of the battery 150 may be received through the receiver 110 . The receiver 110 according to an embodiment may be included in the processor 120. The processor 120 may determine whether the voltage of the battery 150 is greater than or equal to a predetermined value. For example, the processor 120 may determine whether the voltage of the battery 150 is 280V or higher. As another example, the processor 120 may determine whether the voltage of the battery 150 is 350V or higher.

The processor 120 according to an embodiment may apply a control signal determined according to a result of monitoring the voltage of the battery 150 to the first module 131 and/or the second module 132 .

For example, when the voltage of the battery 150 is greater than or equal to the first value, the processor 120 transmits a control signal requesting that the voltage across the second coil 820 and the third coil 830 be maintained below a predetermined value. It can be applied to the first module 131. For example, the processor 120 may apply a high signal to the first module 131 and a low signal to the second module 132 when the voltage of the battery 150 is greater than or equal to the first value. As another example, the processor 120 may apply a high signal to both the first module 131 and the second module 132 when the voltage of the battery 150 is greater than or equal to the first value.

As another example, when the voltage of the battery 150 is between the first value and the second value, the processor 120 transmits a control signal requesting that the voltage applied to the third coil 830 be maintained below a preset value to the second value. module 132. For example, the processor 120 may apply a low signal to the first module 131 and a high signal to the second module 132 when the voltage of the battery 150 is between the first value and the second value. can

As another example, when the voltage of the battery 150 is less than the second value, the processor 120 transmits a control signal requesting that the first module 131 and the second module 132 be kept open to the first module 131. and to the second module 132. For example, the processor 120 may apply a low signal to the first module 131 and the second module 132 when the voltage of the battery 150 is less than the second value.

Each of the first module 131 and the second module 132 according to an embodiment may include one or more devices (eg, Field Effect Transistor (FET)). For example, each of the first module 131 and the second module 132 may include two FETs. The 1-1 FET and the 1-2 FET included in the first module 131 may be connected in series. Also, the direction of the diode included in the 1-1 FET and the direction of the diode included in the 1-2 FET may be opposite to each other. The 2-1 FET and the 2-2 FET included in the second module 132 may be connected in series. In addition, the direction of the diode included in the 2-1 FET and the direction of the diode included in the 2-2 FET may be opposite to each other.

The aforementioned first value may be greater than the second value. Also, the processor 120 may control the first module 131 and the second module 132 by comparing the voltage of the battery 150 with the first value and the second value.

For example, when the voltage of the battery 150 is greater than or equal to a first value (eg, about 350V), the processor 120 according to an embodiment transmits a high signal to the 1-1 FET included in the first module 131 and the second The battery 150 may be charged while maintaining voltages applied to the second coil 820 and the third coil 830 to a preset value or less by applying the 1-2 FET.

As another example, the processor 120 according to an embodiment sends a low signal to the first module 131 when the voltage of the battery 150 is between a first value (eg, about 350V) and a second value (eg, about 250V). is applied to the 1-1 FET and the 1-2 FET included in to maintain the first module 131 in an open state, and the high signal is applied to the 2-1 FET included in the second module 132 and the second By applying -2 to the FET, the battery 150 may be charged while maintaining the voltage across the third coil 830 below a preset value.

As another example, the processor 120 according to an embodiment transmits a low signal when the voltage of the battery 150 is less than the second value (eg, about 250V) to the 1-1 FET included in the first module 131 and the first -2 FET and the battery 150 while operating the first module 131 and the second module 132 in an open state by applying the 2-1 FET and the 2-2 FET included in the FET and the second module 132 ) can be charged.

8 illustrates an example in which the battery charging device 100 charges the battery 150 while maintaining the voltage applied to the second coil 320 to a predetermined value or less according to a control signal according to an embodiment. It is a flow chart.

In step S810, the battery charging device 100 according to an embodiment monitors the voltage of the battery connected to the secondary coil side of the transformer including the primary coil and the secondary coil. For example, the battery charging device 100 may determine whether the voltage output from the battery is greater than or equal to a predetermined value.

In step S820, the battery charging device 100 according to an embodiment applies a control signal determined according to the voltage of the battery to a module connected to a stop of a primary coil composed of a first coil and a second coil connected in series.

For example, when the voltage of the battery is higher than the preset value, the battery charging device 100 may apply a control signal to the module requesting that the voltage applied to the second coil be maintained below the preset value. For example, the battery charging device 100 may apply a high signal to the first FET and the second FET.

As another example, when the voltage of the battery is less than a predetermined value, the battery charging device 100 may apply a control signal to the module requesting operation in an open state. For example, the battery charging device 100 may apply a low signal to the first FET and the second FET.

In step S830, the battery charging device 100 according to an embodiment charges the battery while maintaining the voltage applied to the second coil to a predetermined value or less according to the control signal.

For example, when the voltage of the battery is higher than a preset value, the battery charging device 100 applies a high signal to the first FET and the second FET to maintain the voltage applied to the second coil to a preset value or less while maintaining the battery charge. can be charged for.

As another example, the battery charging device 100 applies a low signal to the first FET and the second FET when the voltage of the battery is less than the predetermined value, while maintaining the module (the first FET and the second FET) in an open state The battery can be charged.

On the other hand, the above-described method can be written as a program that can be executed on a computer, and can be implemented in a general-purpose digital computer that operates the program using a computer-readable recording medium. In addition, the structure of data used in the above-described method can be recorded on a computer-readable recording medium through various means. The computer-readable recording medium includes storage media such as magnetic storage media (eg, ROM, RAM, USB, floppy disk, hard disk, etc.) and optical reading media (eg, CD-ROM, DVD, etc.) do.

Those skilled in the art related to this embodiment will be able to understand that it can be implemented in a modified form within a range that does not deviate from the essential characteristics of the above description. Therefore, the disclosed methods are to be considered in an illustrative rather than a limiting sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent scope will be construed as being included in the present invention.

100: battery charging device 110: receiver
120: processor 130: module
131: first module 132: second module
140: Power 150: Battery
300: transformer 310, 320: primary coil
310: first coil 320: second coil
330: secondary coil 350: inductor
410: first section 420: second section
810: first coil 820: second coil
830: third coil 840: secondary coil
810, 820, 830: primary coil

Claims (15)

monitoring a voltage of a battery connected to a secondary coil side of a transformer including a primary coil and a secondary coil;
A first module connected between the first coil and the second coil of the primary coil composed of a first coil, a second coil, and a third coil connected in series and connected between the second coil and the third coil applying a control signal determined according to the voltage of the battery to a second module; and
and charging the battery while maintaining a voltage applied to the second coil and the third coil or a voltage applied to the third coil to a predetermined value or less according to the control signal.
According to claim 1,
Applying the control signal
When the voltage of the battery is greater than or equal to the first value, a control signal requesting to maintain voltages applied to the second coil and the third coil to a predetermined value or less is applied to the first module and the second module; When the voltage of the battery is between the first value and the second value, applying a control signal to the first module and the second module requesting that the voltage applied to the third coil be maintained below a predetermined value, the battery charging method.
According to claim 1,
Wherein the first module or the second module includes an FET.
According to claim 1,
The first module or the second module includes a first FET and a second FET, wherein the first FET and the second FET are connected in series.
According to claim 4,
A direction of a diode included in the first FET and a direction of a diode included in the second FET are opposite to each other, the battery charging method.
According to claim 1,
The step of charging the battery,
When the voltage of the battery is higher than the first value, a high signal is applied to the first module and the second module to maintain the voltage across the second coil and the third coil below a preset value. A method for charging a battery, wherein the battery is charged.
According to claim 1,
The step of charging the battery,
When the voltage of the battery is less than the second value, applying a low signal to the first module and the second module to charge the battery while maintaining the first module and the second module in an open state , how to charge the battery.
A receiver receiving a voltage of a battery connected to a secondary coil side of a transformer including a primary coil and a secondary coil;
a first module connected between the first coil and the second coil of the primary coil composed of a first coil, a second coil, and a third coil connected in series;
a second module connected between the second coil and the third coil; and
Monitoring the voltage of the battery received by the receiver, applying a control signal determined according to the voltage of the battery to the first module and the second module, and applying the control signal to the second coil and the third coil according to the control signal and a processor configured to charge the battery while maintaining a voltage applied to the third coil to a predetermined value or less or a voltage applied to the third coil to a predetermined value or less.
According to claim 8,
The first module or the second module includes a first FET and a second FET, the first FET and the second FET are connected in series, and the direction of the diode included in the first FET and the second FET A battery charging device in which the directions of the diodes included in the FET are opposite to each other.
According to claim 8,
The processor
When the voltage of the battery is greater than or equal to the first value, a high signal is applied to the first module and the second module to maintain voltages applied to the second coil and the third coil to a predetermined value or less. A battery charging device for charging the battery.
According to claim 1,
The winding ratio of the first coil, the second coil, and the third coil is 10:5:5.
According to claim 1,
The step of charging the battery,
When the voltage of the battery is between the first value and the second value, a low signal is applied to the first module and a high signal is applied to the second module to obtain a voltage across the third coil A battery charging method of performing charging of the battery while maintaining a predetermined value or less.
According to claim 8,
The winding ratio of the first coil, the second coil, and the third coil is 10:5:5.
According to claim 8,
The processor
When the voltage of the battery is between the first value and the second value, a low signal is applied to the first module and a high signal is applied to the second module to obtain a voltage across the third coil A battery charging device that performs charging of the battery while maintaining a predetermined value or less.
According to claim 8,
The processor
When the voltage of the battery is less than the second value, applying a low signal to the first module and the second module to charge the battery while maintaining the first module and the second module in an open state , battery charging device.

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