KR102082317B1 - Battery Charging-Discharging Device Using a Bidirectional Parallel Linear Regulator and Control Method thereof, Recording Medium for Performing the Method - Google Patents

Abstract

The present invention relates to a battery charger / discharger implemented to charge or discharge a battery cell using a parallel switch, the battery cell comprising: at least one battery cell; A parallel linear regulator connected to each battery cell and connected to two switches connected in parallel to each other in order to charge and discharge the battery cells; A relay connected to the parallel linear regulator and switched off so that a current delivered to the parallel linear regulator can be cut off; A relay controller for controlling the switching on or switching off of the relay by comparing voltages at both ends of the relay; A DC voltage converter for supplying an input voltage required for charging the battery cell; And a voltage controller configured to control the input voltage supplied from the DC voltage converter by setting the value of the voltage of the battery cell and the output voltage of the parallel linear regulator to a region of a control reference value.

Description

Battery charging and discharging and control method using a bidirectional linear regulator, a recording medium for performing the method {Battery Charging-Discharging Device Using a Bidirectional Parallel Linear Regulator and Control Method about, Recording Medium for Performing the Method}

The present invention relates to a battery charger and control method, a recording medium for performing the method, and more particularly, to a battery charger and control method implemented to charge or discharge the battery using a parallel switch, A recording medium for performing the method.

As the development and demand for mobile devices increases, the demand for secondary batteries as a source of energy is rapidly increasing. The secondary battery may be used in the form of a single battery cell, or in the form of a battery module electrically connecting a plurality of unit cells, depending on the type of external device used. For example, a small device such as a mobile phone can operate for a predetermined time with the output and capacity of one battery cell, while a notebook computer, a portable DVD, a personal computer, an electric vehicle, a hybrid electric vehicle Medium or large devices such as automobiles require the use of a battery module including a plurality of battery cells due to problems of output and capacity.

The battery module is manufactured by connecting a plurality of unit cells in series and / or in parallel and then connecting a protection circuit. In the case of using a rectangular or pouch type battery as a unit cell, it is possible to easily manufacture by connecting the electrode tabs by a connection member such as a bus bar after stacking the wide surfaces to face each other. Therefore, in the case of manufacturing a three-dimensional battery module having a hexahedral structure, a square or pouch type battery is advantageous as a unit cell.

Conventionally, a nickel cadmium battery or a hydrogen ion battery is mainly used as a secondary battery, but recently, a lithium ion battery and a lithium polymer battery having high energy density have been used. Such secondary batteries are increasing in demand due to the advantages described above.

Meanwhile, the secondary battery is manufactured through a process of assembling a cell and a process of activating a battery. In the battery activation step, the secondary battery is mounted in a predetermined device and charged under conditions necessary for activation.

However, as the field of application of secondary batteries is diversified, battery cells of various sizes and structures are manufactured, and thus, there is a disadvantage in that a separate charge / discharge device must be prepared to activate such battery cells.

In addition, in the field of medium and large battery modules for electric vehicles and hybrid electric vehicles, which have recently been commercialized, plate-type battery cells such as pouch-type batteries have attracted much attention as unit cells, but the size of plate-type batteries by manufacturers or secondary battery models, The position of the electrode tab is different, and particularly, in the case of a battery cell in which electrode tabs are formed at both sides, the size and shape of the charging / discharging device must be changed according to the size difference, so that the time required for the activation of the battery cell is increased. There is a problem in that the manufacturing cost greatly increases by manufacturing a separate charge and discharge device.

Korea Patent Registration No. 10-1017391 Korean Utility Model Model No. 20-2012-0006321

One aspect of the present invention provides a battery charging and discharging and controlling method using a bidirectional linear regulator capable of controlling the charging and discharging current of the battery cell through a parallel linear regulator installed in the battery cell, and a recording medium for performing the method. to provide.

The technical problem of the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

Battery charger using a bidirectional linear regulator according to an embodiment of the present invention, at least one battery cell; A parallel linear regulator connected to each battery cell and connected to two switches connected in parallel to each other in order to charge and discharge the battery cells; A relay connected to the parallel linear regulator and switched off so that a current delivered to the parallel linear regulator can be cut off; A relay controller for controlling the switching on or switching off of the relay by comparing voltages at both ends of the relay; A DC voltage converter connected to the relay in series and supplying an input voltage required for charging the battery cell; And a voltage controller configured to control the input voltage supplied from the DC voltage converter by setting the value of the voltage of the battery cell and the output voltage of the parallel linear regulator to a region of a control reference value.

In an embodiment, the parallel linear regulator may include: a first switch that is switched on when the battery cell is discharged and transfers current supplied from the battery cell to the relay; A second switch connected to the first switch in parallel and switched on when the battery cell is charged, and transferring a current supplied from the relay to the battery cell; And a charge / discharge controller for controlling switching on or switching off of the first switch and the second switch.

In one embodiment, the voltage controller, when charging the battery cell, within the range of the charge control reference value of the reverse conduction diode of the first switch is not turned on, the output voltage of the parallel linear regulator of the battery cell The input voltage supplied from the DC voltage converter may be controlled to be higher than the voltage.

In one embodiment, the relay controller may switch on the relay when the output voltage of the linear regulator is higher than the voltage of the battery cell after switching off the relay when the battery cell is charged.

In example embodiments, the charge control reference value may be higher than the voltage of the battery cell and lower than the threshold of the reverse conducting diode.

In one embodiment, the voltage controller, the output voltage of the parallel linear regulator of the battery cell within the range of the discharge control reference value that the reverse conduction diode of the second switch is not turned on when the battery cell is discharged. The input voltage supplied from the DC voltage converter may be controlled to be lower than the voltage.

The relay controller may switch on the relay when the output voltage of the linear regulator becomes lower than the voltage of the battery cell after switching off the relay when the battery cell is discharged.

In example embodiments, the discharge control reference value may be lower than a voltage of the battery cell and higher than a threshold voltage of the reverse conducting diode.

In one embodiment, the voltage controller may set a control reference value closer to the voltage of the battery cell than the output voltage of the parallel linear regulator.

In one embodiment, when the relay is switched on, the relay controller may set a threshold value of the output voltage of the relay switched on to prevent the inrush current to a preset value.

 Battery charging and discharging control method using a bidirectional linear regulator according to an embodiment of the present invention, supplying an input voltage required for charging the battery cell between the voltage of the battery cell and the output voltage of the parallel linear regulator Setting to an area of a control reference value of the DC voltage converter; Controlling an input voltage supplied from the DC voltage converter according to a set control reference value; Controlling switching on or switching off of the relay by comparing voltages of both terminals of the parallel linear regulator and the relay connected to the parallel linear regulator; And controlling the voltage or current of the parallel linear regulator to perform charging or discharging of the battery cell.

In an exemplary embodiment, the setting of the control reference value may include a range in which the reverse conduction diode of the first switch that is switched on when the battery cell is discharged and transfers current supplied from the battery cell to the relay is not turned on. Setting the charge control reference value; And setting a range in which the reverse conduction diode of the second switch, which is switched on during charging of the battery cell and transfers the current supplied from the relay, to the battery cell, is not turned on as a discharge control reference value.

In a computer-readable storage medium according to another embodiment of the present invention, a computer program for performing a battery charger / discharge control method using a bidirectional linear regulator is recorded.

According to one aspect of the present invention described above, by separately configuring a voltage controller that can control the voltage of the contact point with the linear regulator, it is possible to remove the diode in the parallel linear regulator.

According to one aspect of the present invention, a blocking diode in the existing technology by adding a relay connected between the parallel linear regulator and the DC voltage converter, and applying a voltage controller capable of controlling the input voltage to the DC voltage converter, Can be prevented from being added.

According to one aspect of the present invention, by configuring a configuration that can charge or discharge the battery cells with a linear regulator, there is no noise, can improve the reliability and efficiency, as well as reduce the manufacturing cost, overall The formation volume can be reduced.

1 is a view showing a schematic configuration of a battery charger and a battery using a bidirectional linear regulator according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating power transfer during battery discharge in the battery charger and battery of FIG. 1.
FIG. 3 is a diagram illustrating power transfer during battery charging in the battery charger and battery of FIG. 1.
4 and 5 illustrate a conventional transfer gate field effect transistor.
6 is a diagram illustrating a schematic configuration of a battery charger / discharger using a bidirectional linear regulator according to another embodiment of the present invention.
7 is a flowchart illustrating a method for controlling a battery charger / discharge using a bidirectional linear regulator according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is to be understood that the various embodiments of the invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein may be embodied in other embodiments without departing from the spirit and scope of the invention in connection with one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined only by the appended claims, along with the full scope of equivalents to which such claims are entitled. Like reference numerals in the drawings refer to the same or similar functions throughout the several aspects.

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

1 is a view showing a schematic configuration of a battery charger using a bidirectional linear regulator according to an embodiment of the present invention, Figure 2 is a diagram illustrating the power transfer during battery discharge in the battery charger of Figure 1 FIG. 3 is a diagram illustrating power transfer during battery charging in the battery charger and battery of FIG. 1.

1 to 3, a battery charger using a bidirectional linear regulator includes at least one battery cell 100, a parallel linear regulator 200, a relay 300, a DC voltage converter 400, a voltage controller ( 500 and relay controller 600.

In the drawings of the present specification, the solid line indicates the flow of power, and the dotted line indicates the flow of signals between the respective components.

The flow of power in the present invention is, first, in the case of discharging (see FIG. 2), directly through the relay 300 through the first switch 210 of the parallel linear regulator 200 in the battery cell 100. The second switch of the parallel linear regulator 200 is delivered to the output through the voltage converter 400, and in the case of charging (see FIG. 3), the power supplied from the DC voltage converter 400 is passed through the relay 300. The battery cell 100 is transferred to the battery cell 100 through 220.

The battery cell 100 refers to an electric energy storage device capable of being charged or discharged by dipping into a pair of positive and negative plates in a battery and immersed in an electrolyte in a compartment of one compartment and separated from other cells.

A plurality of battery cells 100a, 100b, and 100c may be formed, and may be variously formed in response to a request of an apparatus requiring the battery cell 100.

Here, the battery cell 100 is a generic term for an energy storage device capable of charging or discharging through a current or a voltage. If the energy storage device is an energy storage device, the battery cell 100 may be applied without being limited thereto.

The parallel linear regulator 200 is connected to each of the battery cells 100 and is installed in parallel with two switches that are switched on in response to charging and discharging of the battery cells 100, respectively, to the battery cells 100. Current is transmitted (ie, in the case of charging) or current is received from battery cell 100 (ie, in the case of discharging).

The parallel linear regulator 200 is connected to the battery cells 100 in correspondence with the number of battery cells 100, respectively, and when the number of battery cells 100 changes, the corresponding number changes to the same number to correspond to the number of battery cells 100. Can be installed on each connection. That is, the parallel linear regulator 200 may be formed in a number corresponding to the number of battery cells 100.

For example, when three battery cells 100a, 100b and 100c are formed, parallel linear regulators 200a, 200b and 200c may be connected to each of the battery cells 100a, 100b and 100c.

The parallel linear regulator 200 may include the first switch 210 and the second switch so that the first switch 210 and the second switch 220 may be in charge of charging or discharging the battery cell 100, respectively. 220 is formed to be connected in parallel. Accordingly, the first switch 210 and the second switch 220 may provide improved efficiency than when connected in series.

However, when the first switch 210 and the second switch 220 are formed of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) generally used at the time of charging or discharging, a reverse-conducting diode is generated. There is a fear that the current control becomes unstable.

Therefore, the voltage controller 500 capable of connecting and adding the relay 300 to be described later between the parallel linear regulator 200 and the DC voltage converter 400 and controlling the input voltage to the DC voltage converter 400. By applying, the reverse conduction diode is prevented from being generated.

In one embodiment, the relay 300 is connected to at least two parallel linear regulators 200 when the plurality of parallel linear regulators 200 are formed as described above, thereby charging or charging the battery cells 100. The electric power may be transmitted or received in response to the discharge.

In an embodiment, the parallel linear regulator 200 may include a first switch 210, a second switch 220, and a charge / discharge controller 230.

The first switch 210 is switched on (ie, short-circuit) when the battery cell 100 is discharged to transfer current supplied from the battery cell 100 to the relay 300.

The second switch 220 is connected to the first switch 210 in parallel, and is switched on (ie, short-circuit) when the battery cell 100 is charged to receive current supplied from the relay 300. Transfer to the battery cell 100.

The charge / discharge controller 230 is connected to the first switch 210 and the second switch 220, respectively, and controls the switching on or switching off of the first switch 210 and the second switch 220.

In one embodiment, the first switch 210 and the second switch 220, which are switches of the parallel linear regulator 200, may be formed of a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), as well as a switching operation. It may be formed of a transistor other than a MOSFET that can be performed.

4 is a diagram illustrating a conventional transmission gate field effect transistor (FET).

Referring to FIG. 4, in the case of the conventional transfer gate field effect transistor, power is transferred through a parallel switching operation as in the present invention. However, the present invention and the conventional transfer gate field effect transistor have the following differences. Have.

Conventional transfer gate field effect transistors, unlike traditional field effect transistors, are composed of two p-channel and n-channel field effect transistors, and a substrate terminal (bulk) is not internally connected to the source terminal. Two transistors, n-channel MOSFETs and p-channel MOSFETs, are connected in parallel, but only the drain and source terminals of both transistors are connected together.

Accordingly, since their gate terminals are connected to each other by a NOT gate (inverter) to form a control terminal, the two MOSFETs must be turned on or off at the same time.

In addition, the substrate terminals of the transfer gate field effect transistors are not connected to the source connection, but instead of each supply, to ensure that the parasitic and reverse conduction diodes between the gate and the substrate are always biased in the reverse direction to not affect the signal flow. Connected to the potential. That is, the body diode present in the MOSFET should always be turned off.

 This is made possible by connecting the substrate terminal of the p-channel MOSFET to a positive supply potential and the substrate terminal of the n-channel MOSFET to a negative supply potential.

That is, the parallel linear regulator 200 of the present invention is composed of two n-channel or two p-channel transistors, and linearly operates using voltage control in the presence of a reverse conducting body diode. On the other hand, the conventional transfer gate field effect transistor as shown in FIG. 4 corresponds to a MOSFET structure having a special structure in which on / off switching operation is performed in a nonlinear operation while the reverse conducting diode is inactivated.

5 is a view for explaining a conventional parallel linear regulator ("Integrated circuit for electronic cigarette and electronic cigarette", CN104055224A) in order to compare with the present invention.

Conventional parallel linear regulators have a problem in that diodes are required in series as shown in FIG.

Accordingly, in the present invention, the DC voltage converter 400 formed at the rear end of the circuit controls the voltage of the contact point with the parallel linear regulator 200, thereby eliminating the configuration of the diode that had to be included in the regulator.

The relay 300 is connected between the parallel linear regulator 200 and the DC voltage converter 400 so that the DC voltage converter may be used when the output voltage of the parallel linear regulator 200 may conduct a reverse conducting diode. In order to cut off the connection with the 400, the switch is switched off under the control of the relay controller 600.

In one embodiment, the relay 300 is configured to prevent a situation in which the reverse conduction diode of the MOSFET may conduct when the input voltage of the DC voltage converter 400 is connected to the output voltage of the charge / discharge controller 230. The left and right circuits (ie, the parallel linear regulator 200 and the DC voltage converter 400) may be blocked.

In one embodiment, the relay 300 may be formed of a general relay that operates when the input reaches a set value and opens and closes other circuits, as well as any conventional switch.

When the battery cell 100 is charged, the second switch 220 is switched on and the first switch 210 is turned off to adjust the current, and when the battery cell 100 is discharged, the first switch 210 is switched on. The second switch 220 is turned off to adjust the current. In this case, when the MOSFET is used as a switch, due to the internal reverse conduction diode, there is a risk that the diode of the first switch 210 may conduct when charging, and in the case of discharge, the diode of the second switch 220 conducts. I have a risk to do it.

Accordingly, in the present invention, when the current supplied to the battery cell 100 or the current supplied from the battery cell 100 can flow to the reverse conducting diode, it is prevented by switching off of the relay 300, the reverse conducting diode By controlling the input voltage of the DC voltage converter 400 with the voltage controller 500 within the range where the conduction is not conducted, when the input voltage reaches within the set range, the relay 300 is turned on to charge the battery cell 100. Alternatively, the discharge may be performed.

The relay controller 600 compares the voltages of both ends of the relay 300 in the switched off state to determine the switching on or the switching off of the relay 300.

In one embodiment, the relay controller 600, when changing the relay 300 from the switched off state to the switched on state, may have inputted a switch of a circuit such as a rush current, a line , a transformer , a motor, or a capacitor . If, to prevent an excessive current is increased for a short period, but return as soon as the steady state) occurs, relay 300 has a predetermined output voltage threshold value (threshold) of the relay 300 is switched on the value (for example, For example, the input voltage of the relay 300 may be set to 85% to 95%, and the like.

The DC voltage converter 400 is connected to the relay 300 in series and supplies the input voltage required for charging the battery cell 100 under the control of the voltage controller 500.

The voltage controller 500 refers to the voltage of the battery 100 and the linear voltage regulator in parallel with the voltage of the battery cell 100 and the output voltage of the linear regulator 200 in parallel when the relay 300 is switched off. It is possible to prevent conduction of the reverse conduction diode and to control the input voltage supplied from the DC voltage converter 400 by having the value between the two voltages of 200 as a control reference value.

In one embodiment, the voltage controller 500, in setting the control reference value, as close as possible to the charge and discharge current control of the parallel linear regulator 200, the control reference value as close to the voltage of the battery cell 100. By setting this, charging or discharging efficiency can be maximized.

That is, the voltage controller 500 allows the input voltage supplied from the DC voltage converter 400 to be controlled within a range in which the reverse conduction diode of the first switch 210 or the second switch 220 does not become conductive. When the input voltage is not sufficiently controlled, it is possible to prevent conduction of the reverse conducting diode by switching off the relay 300.

After the relay 300 is switched off, when the voltages of both ends of the relay 300 are close to each other, the relay 300 is switched on, and the input voltage of the DC voltage converter 400 controlled by the voltage controller 500 is It is controlled to be as close as possible to the voltage of the battery cell 100 (within the limit controlled by the parallel linear regulator 200 as desired).

First, in the case of charging the battery cell 100, the voltage controller 500 outputs the parallel linear regulator 200 within a range of a charge control reference value in which the reverse conduction diode of the first switch 210 is not turned on. The input voltage supplied from the DC voltage converter 400 may be controlled so that the voltage is higher than the voltage of the battery cell 100.

In one embodiment, after the relay controller 600 switches off the relay 300 when the battery cell 100 is charged, the output voltage of the parallel linear regulator 200 is higher than the voltage of the battery cell 100. When the relay 300 is switched on, the input voltage supplied from the DC voltage converter 400 may be transferred.

In one embodiment, the charge control reference value for charging the battery cell 100 according to the present invention is higher than the voltage of the battery cell 100, the threshold voltage of the reverse conducting diode (for example, of the battery cell 100 The voltage may be lower than the voltage + 0.7V, where "0.7V" corresponds to a general body diode threshold voltage. For example, when the voltage of the battery cell 100 is 4V, the charge control reference value may be a voltage value higher than 4V and lower than 4.7V.

Next, in the case of discharging the battery cell 100, the voltage controller 500 controls the voltage of the parallel linear regulator 200 within the range of the discharge control reference value at which the reverse conduction diode of the second switch 220 is not turned on. The input voltage supplied from the DC voltage converter 400 may be controlled so that the output voltage is lower than the voltage of the battery cell 100.

In one embodiment, the relay controller 600 switches off the relay 300 when the battery cell 100 is discharged, and then relays when the output voltage of the linear regulator 200 becomes lower than the voltage of the battery cell 100. By switching on 300, the input voltage supplied from the battery cell 100 may be transferred to the output terminal.

In one embodiment, the discharge control reference value for discharging the battery cell 100 according to the present invention is lower than the voltage of the battery cell 100, the threshold voltage of the reverse conducting diode (for example, of the battery cell 100 Voltage -0.7V, where "0.7V" corresponds to a general body diode threshold voltage). For example, when the voltage of the battery cell 100 is 4V, the discharge control reference value may be a voltage value lower than 4V and higher than 3.3V.

6 is a diagram illustrating a schematic configuration of a battery charger / discharger using a bidirectional linear regulator according to another embodiment of the present invention.

Referring to FIG. 6, the battery charger 2 using the bidirectional linear regulator includes at least one battery cell 100, a parallel linear regulator 200, a plurality of relays 300, and a DC voltage converter 400. , Voltage controller 500 and relay controller 600. Here, the configuration of the battery cell 100, the parallel linear regulator 200, the DC voltage converter 400, the voltage controller 500, and the relay controller 600 except for the relay 300 is the same as that of FIG. 1. Therefore, the description is omitted.

The plurality of relays 300a and 300b are connected to at least one parallel linear regulator 200 so as to control the relay controller 600 so that the current delivered to the parallel linear regulator 200 can be cut off. Each switch is off accordingly.

For example, when three parallel linear regulators 200a, 200b and 200c are formed and two relays 300a and 300b are formed as shown in FIG. 6, two parallel linear regulators ( 200a and 200b may be connected to the first relay 300a, and the remaining parallel linear regulator 200c may be connected to the second relay 300b.

In the conventional case, the battery cell units are connected in series to be used at high voltage and high power. Since there is a variation between the cells, a cell balancing circuit for controlling the charge amount is added to each cell, which has problems in price, efficiency and size.

In order to solve this problem, a high boost / high voltage bidirectional converter has been proposed to connect from a single low voltage cell to a high voltage DC link, but since the desired current is different for each battery cell, a converter is required for each battery cell so that the bidirectional converter can be changed into two stages. It was proposed to design separately.

However, when a switching converter is included in each battery cell, it is inevitably disadvantageous in terms of price and size.

Accordingly, the battery charger / discharger using the bidirectional linear regulator having the configuration as described above, unlike the conventional battery charging or discharging circuit using the switching type charge / discharge converter, uses a linear regulator in parallel but additional blocking diode ( It is possible to provide a battery charging or discharging device in which a blocking diode is installed in series with a series of modules and performs a blocking function to prevent backflow of the module string.

7 is a flowchart illustrating a method of controlling a battery charger / discharge using a bidirectional linear regulator according to an embodiment of the present invention.

Referring to FIG. 7, in the method of controlling a battery charger / discharge using a bidirectional linear regulator, first, a voltage value of the voltage of the battery cell 100 and an output voltage of the parallel linear regulator 200 is charged when the battery cell 100 is charged. It sets to the area of the control reference value of the DC voltage converter for supplying the required input voltage (S610).

In an embodiment, the step S610 of setting the area of the control reference value is switched on when the battery cell 100 is discharged, and transmits a current supplied from the battery cell 100 to the relay 300 to the first switch 210. A second switch 220 which sets a range in which the reverse conduction diode of ON does not turn on as a charging control reference value, and is switched on during charging of the battery cell 100 to transfer current supplied from the relay 300 to the battery cell 100. Can be set as the discharge control reference value.

The input voltage supplied from the DC voltage converter 400 is controlled according to the control reference value set in the above-described step S610 (S620).

In one embodiment, the control of the input voltage in the above-described step S620, the DC voltage so that the output voltage of the parallel linear regulator 200 is higher than the voltage of the battery cell 100, when charging the battery cell 100 The input voltage supplied from the converter 400 may be controlled.

In one embodiment, during charging of the battery cell 100, after switching off the relay 300, the relay 300 may be switched on when the output voltage of the linear regulator is higher than the voltage of the battery cell 100. .

In one embodiment, the charge control reference value may be higher than the output voltage of the battery cell 100 and lower than the voltage of the battery cell 100 + 0.7V.

In one embodiment, the control of the input voltage in the above-described step S620 is a direct current voltage such that the output voltage of the parallel linear regulator 200 is lower than the voltage of the battery cell 100 when the battery cell 100 is discharged. The input voltage supplied from the converter 400 may be controlled.

In one embodiment, after discharging the battery cell 100, after switching off the relay 300, the relay 300 may be switched on when the output voltage of the linear regulator becomes lower than the voltage of the battery cell 100. .

In one embodiment, the discharge control reference value may have a value lower than the voltage of the battery cell 100 and higher than the voltage of the battery cell 100 −0.7V.

The switching on or off of the relay 300 is controlled by comparing the voltage between both ends of the parallel linear regulator 200 connected to the relay 300 installed at step S630.

The voltage or current of the parallel linear regulator 200 is controlled to perform charging or discharging of the battery cell 100 (S640).

The battery charger / discharge control method using the bidirectional linear regulator as described above may be embodied in the form of program instructions that may be implemented as an application or executed through various computer components, and recorded in a computer-readable recording medium. The computer-readable recording medium may include program instructions, data files, data structures, etc. alone or in combination.

The program instructions recorded on the computer-readable recording medium are those specially designed and configured for the present invention, and may be known and available to those skilled in the computer software arts.

Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CDROMs and DVDs, and magneto-optical media such as floptical disks. And hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.

Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform the process according to the invention, and vice versa.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

According to the present invention, by providing a battery charger using a bidirectional linear regulator that can control the charge and discharge current of the battery cell through a parallel linear regulator installed in the battery cell, it is possible to control the voltage of the contact point with the linear regulator By configuring a separate voltage controller, the configuration of additional blocking diodes in the parallel linear regulator can be omitted.

Accordingly, according to the present invention, it is possible to reduce the manufacturing cost due to diode removal, to reduce the overall size, and to increase power efficiency and circuit reliability.

1, 2: Battery charger with bidirectional linear regulator
100a, 100b, 100c: battery cell
200a, 200b, 200c: parallel linear regulator
210a, 210b, 210c: first switch
220a, 220b, 220c: second switch
230: charge and discharge controller
300a, 300b: relay
400: DC voltage converter
500: voltage controller
600: relay controller

Claims (13)

At least one battery cell;
A parallel linear regulator connected to each battery cell, the two switches being connected in parallel to each other in response to charging and discharging of the battery cell;
A relay connected to the parallel linear regulator and switched off so that a current delivered to the parallel linear regulator can be cut off;
A relay controller for controlling switching on or switching off of the relay by comparing voltages at both ends of the relay;
A DC voltage converter connected to the relay in series and supplying an input voltage required for charging the battery cell; And
And a voltage controller configured to control the input voltage supplied from the DC voltage converter by setting the value of the voltage of the battery cell and the output voltage of the parallel linear regulator to a region of a control reference value. Discharger.
The method of claim 1, wherein the parallel linear regulator,
A first switch switched on when the battery cell is discharged and transferring a current supplied from the battery cell to the relay;
A second switch connected to the first switch in parallel and switched on when the battery cell is charged, and transferring a current supplied from the relay to the battery cell; And
And a charge / discharge controller configured to control switching on or off of the first switch and the second switch.
The method of claim 2, wherein the voltage controller,
When charging the battery cell, the DC voltage converter is supplied from the DC voltage converter such that the output voltage of the parallel linear regulator is higher than the voltage of the battery cell within a range of a charge control reference value in which the reverse conduction diode of the first switch is not turned on. Battery charger using bidirectional linear regulator to control the input voltage.
The method of claim 3, wherein the relay controller,
And switching off the relay when the output voltage of the linear regulator is higher than the voltage of the battery cell after switching off the relay during charging of the battery cell.
The method of claim 4, wherein the charge control reference value,
A battery charger / discharger using a bidirectional linear regulator having a value higher than an output voltage of the battery cell and lower than a threshold voltage of the reverse conducting diode.
The method of claim 2, wherein the voltage controller,
When the battery cell is discharged, it is supplied from the DC voltage converter such that the output voltage of the parallel linear regulator is lower than the voltage of the battery cell within a range of a discharge control reference value in which the reverse conduction diode of the second switch is not turned on. Battery charger using bidirectional linear regulator to control the input voltage.
The method of claim 6, wherein the relay controller,
And switching off the relay when the output voltage of the linear regulator becomes lower than the voltage of the battery cell after switching off the relay when the battery cell is discharged.
The method of claim 7, wherein the discharge control reference value,
A battery charger / discharger using a bidirectional linear regulator having a value lower than the voltage of the battery cell and higher than the threshold voltage of the reverse conducting diode.
The method of claim 1, wherein the voltage controller,
And a control reference value set closer to the voltage of the battery cell than to the output voltage of the parallel linear regulator.
The method of claim 1, wherein the relay controller,
When the relay is switched on, to set the threshold value of the output voltage of the relay that is switched on to prevent the inrush current to a predetermined value, the battery charger and battery using a two-way linear regulator.
Claim 11 was abandoned upon payment of a set-up fee. Setting an excitation value of a voltage of a battery cell and an output voltage of a parallel linear regulator to an area of a control reference value of a DC voltage converter for supplying an input voltage required for charging the battery cell;
Controlling an input voltage supplied from the DC voltage converter according to a set control reference value;
Controlling switching on or switching off of the relay by comparing voltages of both terminals of the parallel linear regulator and the connected relay; And
And controlling the voltage or current of the parallel linear regulator to perform charging or discharging of the battery cell.
Claim 12 was abandoned upon payment of a set-up fee. The method of claim 11, wherein the setting of the control reference value to an area comprises:
Setting a range in which the reverse conduction diode of the first switch which is switched on when the battery cell is discharged and transfers the current supplied from the battery cell to the relay is not turned on as a charge control reference value; And
Using a bidirectional linear regulator, including setting a range in which the reverse conduction diode of the second switch that is switched on when the battery cell is charged and delivers current supplied from the relay to the battery cell is not turned on. How to control battery charger.
Claim 13 has been abandoned upon payment of a setup registration fee. A computer-readable recording medium having a computer program recorded thereon for performing the battery charger / discharge control method using the bidirectional linear regulator according to claim 11.

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