KR102530292B1 - Charging device - Google Patents

Abstract

The present invention provides a charging device which comprises: a charging/discharging module that charges and discharges a secondary battery; a control module that outputs a voltage control signal to control charging and discharging operations of the charging/discharging module; and an adjustment module that converts the voltage control signal into an analog type first digital analog converter (DAC) signal and outputs a second DAC signal for varying rising time and falling time of the first DAC signal to the charging/discharging module.

Description

Charging device {Charging device}

The present invention relates to a charging device, and more particularly, to a charging device capable of varying the rising time and falling time of an analog digital analog converter (DAC) signal corresponding to a voltage control signal for charging and discharging a secondary battery. It's about the device.

In the production of electrical energy based on renewable energy sources, in particular photovoltaic power generation or wind power generation, there is a growing demand for efficiently storing the generated energy in order to make available the stored electrical energy as needed when needed. this is being converted.

In general, a lithium ion battery, known as a secondary battery, has a high number of charge cycles, a long lifespan and a high storage capacity.

Lithium-ion batteries are discharged to 30% of their capacity, depending on their design. That is, if the battery is discharged below the critical value of 30%, the lithium ion battery is irreversibly damaged, so 30% of the intrinsic energy stored in the battery is not utilized by the user. If the battery is discharged below this threshold, ions can be separated from the electrode material (copper, A1), which can lead to electrode destruction.

In order to produce and ship batteries such as lithium ion batteries, several processes are required, including aging, formation, OCV (open circuit voltage) inspection, IR (internal resistance) inspection, and grading.

Among these processes, the formation process repeats the process of charging the produced O Volt battery to a cell voltage of 4.2 V and then discharging it to 2.7 V several times to finally ship it to 3.7 V. Therefore, since the characteristics and quality of the battery are determined in this process, the formation process is a very important process for determining the quality of the battery.

However, during the formation process, the lithium ion battery is only charged to 80% of its capacity because the current is normally limited when the end-of-charge voltage is reached, so the remaining 20% of the capacity Since the % is charged at fewer amps, less energy is stored or built into the cell in terms of time, so it will take exponentially more time for the cell to charge to 100%.

Recently, there is a tendency to improve the characteristics and quality of batteries by performing charging and discharging with high current during the chemical process. Research is being conducted to prevent the occurrence of oscillation, overshoot, and undershoot caused by varying the output stage.

An object of the present invention is to provide a charging device that can easily vary the rising time and falling time of an analog digital analog converter (DAC) signal corresponding to a voltage control signal for charging and discharging a secondary battery.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned above can be understood by the following description and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by means of the instrumentalities and combinations indicated in the claims.

The charging device according to the present invention. A charge/discharge module for charging and discharging a secondary battery, a control module for outputting a voltage control signal for controlling charging and discharging operations of the charging and discharging module, and a first digital analog converter (DAC) signal for converting the voltage control signal to an analog type and an adjustment module outputting a second DAC signal obtained by varying the rising time and falling time of the first DAC signal to the charge/discharge module.

The adjusting module may include a digital analog converter (DAC) converting the voltage control signal into the first DAC signal, a first voltage follower outputting the first DAC signal input from the DAC as it is, and the first DAC signal. 1 RC oscillator for outputting a second DAC signal obtained by varying the rising time (Tr) and falling time (Tf) of the first DAC signal input from the voltage follower, and outputting the second DAC signal input from the RC oscillator as it is It may include a second voltage follower that does.

The first voltage follower may include an output terminal, a non-inverting terminal to which the first DAC signal is input, and an inverting terminal connected to the output terminal and receiving the first DAC signal as a feedback.

The RC oscillation unit is connected in parallel with a first multiplexer for selecting any one specific resistor among a plurality of resistors connected in parallel to which the first DAC signal is input and the first multiplexer and the second voltage follower, and is connected in parallel with each other. A second mux that selects one specific capacitor from among a plurality of capacitors may be included.

The first and second muxes are time constants for outputting the second DAC signal for varying the rising time (Tr) and falling time (Tf) of the first DAC signal based on the output time of the second DAC signal. The specific resistor and the specific capacitor may be selected to have

The second voltage follower may include an output terminal, a non-inverting terminal to which the second DAC signal is input, and an inverting terminal connected to the output terminal and receiving the second DAC signal as a feedback.

The charging device according to the present invention converts a voltage control signal input from a control module into an analog first DAC signal, and converts the charging/discharging module to a second DCA signal obtained by varying the rising time and falling time of the first DAC signal. By controlling, there is an advantage in that fast switching of charging and discharging operations of the charging/discharging module can be performed.

In addition, the charging device according to the present invention has an advantage of preventing oscillation, oversheeting, and undersheeting by varying the rising time and falling time of the first DAC signal.

On the other hand, the effects of the present invention are not limited to the effects mentioned above, and various effects may be included within a range apparent to those skilled in the art from the contents to be described below.

1 is a diagram showing a formation process of a lithium secondary battery according to the present invention.
2 is a control block diagram showing a control configuration of a charging device according to the present invention.
FIG. 3 is a timing diagram illustrating charge pulses and discharge pulses output from the charge/discharge module shown in FIG. 2 .
4 is a circuit diagram illustrating the adjustment module shown in FIG. 2;
5 is a circuit diagram showing the charging part shown in FIG. 2 in detail.
6 and 7 are exemplary diagrams for explaining the operation of the charging unit shown in FIG. 5 .
FIG. 8 is a circuit diagram showing the discharge part shown in FIG. 2 in detail.
9 and 10 are exemplary diagrams for explaining the operation of the discharge unit shown in FIG. 8 .

Since the present invention can make various changes and have various embodiments, specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention. Like reference numerals have been used for like elements throughout the description of each figure.

Terms such as first, second, A, and B may be used to describe various components, but the components should not be limited by the terms. These terms are only used for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The term and/or includes a combination of a plurality of related recited items or any one of a plurality of related recited items.

It is understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle. It should be. On the other hand, when an element is referred to as “directly connected” or “directly connected” to another element, it should be understood that no other element exists in the middle.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Expressions in the singular number include plural expressions unless the context clearly dictates otherwise. In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in this application, it should not be interpreted in an ideal or excessively formal meaning. don't

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

1 is a diagram showing a formation process of a lithium secondary battery according to the present invention.

Figure 1 (a) is a state that does not have electrical characteristics after the lithium secondary battery is manufactured, Figure 1 (b) is a formation process (Formation), a solid electrolyte intermediate material (SEI) to have electrical characteristics in the lithium secondary battery , Solid Electrolyte Interphase) layer is starting to form, and FIG. 1(c) shows a lithium secondary battery having electrical characteristics after the conversion process is completed.

Here, the solid electrolyte intermediate layer (SEI) is an important factor determining the electric capacity, performance, and lifespan of a lithium secondary battery.

That is, in FIG. 1(b) , in order to activate the lithium secondary battery, charging pulses and discharging pulses may be alternately supplied to the cathode and the anode to generate a solid electrolyte intermediate layer (SEI) on the anode side.

Here, the electrolyte intermediate material layer (SEI) can prevent lithium ions (Li + ) from reacting with other materials at the anode when the lithium secondary battery is later charged.

In addition, the electrolyte intermediate material layer (SEI) performs a kind of ion tunneling function and can pass only lithium ions (Li+).

That is, the solid electrolyte intermediate material layer (SEI) may be formed in a process of activating a cell in a discharged state in a formation process, that is, an initial charging process of a lithium secondary battery.

First, during charging of the lithium secondary battery, when a charging pulse is supplied to the lithium secondary battery, lithium ions (Li+) pass from the cathode of the lithium secondary battery to the anode, and react with additives in the negative electrode electrolyte to form the front side of the anode interface. A thin solid electrolyte intermediate material layer (SEI) can be created.

That is, the solid electrolyte intermediate material layer (SEI) is an insulator formed when the amount of ion movement of the battery increases, and once formed, it can prevent lithium ions (Li + ) and other materials from reacting at the anode during subsequent battery charging.

2 is a control block diagram showing a control configuration of a charging device according to the present invention, and FIG. 3 is a timing diagram showing charge pulses and discharge pulses output from the charge/discharge module shown in FIG. 2 .

Referring to FIGS. 2 and 3 , the charging device 100 may include an input module 110 , an adjustment module 120 , a charge/discharge module 130 and a control module 140 .

In the embodiment, the charging device 100 is described as being applied to a formation process for activating a secondary battery, for example, a lithium secondary battery, but is not limited thereto.

The input module 110 may input rated capacity information of a secondary battery having no electrical characteristics and an activation start command of the secondary battery.

First, the rated capacity information of the secondary battery may include at least one of a maximum charging capacity and a rated current of the secondary battery, but is not limited thereto.

Here, the activation start command may be a command to start charging and discharging the secondary battery for the first time.

As a result, the input module 110 may input the activation start command for starting the formation of a solid electrolyte interphase (SEI) layer in the discharge state of the secondary battery.

The adjustment module 120 converts the voltage control signals SC1 and SC2 output from the control module 140 into a first DAC signal and charges a second DAC signal obtained by varying the rising time and falling time of the first DAC signal. It can be output to the discharge module 130.

A detailed description of the adjustment module 120 will be described later with reference to FIG. 4 .

The voltage control signals SC1 and SC2 include a first voltage control signal SC1 for a charging operation of the charge/discharge module 130 and a second voltage control signal SC2 for a discharge operation of the charge/discharge module 130. can do.

The charge/discharge module 130 may supply charge pulses cp for charging and discharge pulses dp for discharge to the secondary battery contact-coupled to a jig under the control of the control module 140. there is.

The charge/discharge module 130 may include a charging unit 132 and a discharging unit 136 .

In the embodiment, the charge/discharge module 130 does not limit the number of charging units 132 and discharging units 136 .

First, the charging unit 132 corresponds to the first voltage control signal SC1 output from the control module 140 and operates according to the second DAC signal output from the adjustment module 120 to generate the charging pulses cp as described above. It can be supplied by a secondary battery.

In addition, the discharge unit 136 corresponds to the second voltage control signal SC1 output from the control module 140 and operates according to the second DAC signal output from the adjustment module 120 to generate discharge pulses dp. It can be supplied to the secondary battery.

The charging unit 132 and the discharging unit 136 will be described in detail with reference to FIGS. 5 to 9 .

The control module 140 may set the charging current Ic of the charging pulses cp and the discharging current Id of the discharging pulses dp according to the power capacity information.

Then, when the activation start command is input, the control module 140 charges and discharges high current charge pulses cp and discharge pulses dp alternately from the activation start time TP to the secondary battery. The module 130 can be controlled.

Here, the control module 140 may set and determine the charging current I1 and the discharging current I2 based on the rated current.

First, the charging current I1 may be 1 to 3 times greater than the rated current, and when less than 1 time greater than the rated current, the charging time of the secondary battery becomes longer, and when greater than 3 times greater than the rated current, the secondary battery The charging time of can be shortened, but salt reaction may occur due to overcharging.

In addition, the discharge current (I2) may be 0.2 to 0.5 times greater than the rated current. When less than 0.2 times greater than the rated current, the discharge time of the secondary battery becomes longer, and when greater than 0.5 times greater than the rated current, the secondary battery The discharge time of can be shortened, but salt may be generated due to overcharging.

At this time, the control module 140 may determine the charging holding time ct according to the charging current I1.

For example, when the current is three times greater than the rated current, the charge holding time ct of the charging current I1 may be longer than when the charging current I1 is one time greater than the rated current.

The charging holding time (ct) of the charging current (I1) may be 20 ms to 100 ms, and if it is faster than 20 ms, the charging current (I1) may be overcharged by more than three times the rated current, and 100 ms If it is longer, the charging time may be longer because the charging current I1 is less than 1 times the rated current.

Also, the control module 140 may determine the discharge holding time dt according to the discharge current I2.

For example, when the discharge current I2 is 0.5 times greater than the rated current, the discharge holding time dt of the discharge current I2 may be shorter than when the discharge current I2 is 0.2 times greater than the rated current.

The discharge holding time (dt) of the discharge current (I2) may be 5ms to 30ms, if it is faster than 5ms, the discharge effect by the discharge current (I2) is lowered, and if it is longer than 30ms, the discharge time of the discharge current (I2) can be long

In addition, the charge duration ct of the charge pulses cp may be 1.5 to 5 times greater than the discharge duration dt of the discharge pulses dp, but is not limited thereto.

Also, the amount of discharge of each of the discharge pulses dp may be 0.04 to 0.16 times the amount of charge of each of the charge pulses cp.

Here, the charge amount and the discharge amount may be determined by current and holding time, and may be adjusted according to the rated capacity of the secondary battery, but are not limited thereto.

As such, the charging device 100 sequentially supplies charging pulses cp and discharging pulses dp to the secondary battery having no electrical characteristics, thereby providing a solid electrolyte intermediate material (SEI, Solid) in the secondary battery. Electrolyte Interphase) layer can be formed to have the electrical characteristics of the secondary battery.

That is, the control module 140 may output the first and second voltage control signals SC1 and SC2 to the control module 120 for charging and discharging the secondary battery.

In addition, the control module 140 may output a result to the outside when at least one of the charging unit 132 and the discharging unit 136 is not determined to be in normal operation, but is not limited thereto.

4 is a circuit diagram illustrating the adjustment module shown in FIG. 2;

Referring to FIG. 4 , the adjustment module 120 may include a Digital Analog Converter (DAC) 122, a first voltage follower 124, an RC oscillator 126, and a second voltage follower 128.

The DAC 122 may convert the voltage control signals SC1 and SC2 input from the control module 140 into a first DAC signal DAC1.

That is, the DAC 122 may convert the digital type voltage control signals SC1 and SC2 into an analog type first DAC signal DAC1 and output it to the first voltage follower 124 .

The first voltage follower 124 may be implemented as an operational amplifier and may output the first DAC signal DAC1 as it is.

Here, the first voltage follower 124 may include an output terminal, a non-inverting terminal to which the first DAC signal DAC1 is input, and an inverting terminal connected to the output terminal and returning the first DAC signal DAC1. there is.

The RC oscillator 126 may include first and second muxes MUX1 and MUX2.

First, a plurality of resistors connected in parallel to each other may be connected to the first multiplexer MUX1.

The plurality of resistors may have different resistance values, and a first DAC signal DAC1 may be input.

The first multiplexer MUX1 may select one specific resistor from among the plurality of resistors and output the selected resistor to the second multiplexer MUX2 and the second voltage follower 128 .

A plurality of capacitors connected in parallel to each other may be connected to the second mux MUX2 .

The output terminal of the second multiplexer MUX2 may be connected in parallel with the first multiplexer MUX1 and the second voltage follower 128 .

Also, the second multiplexer MUX2 may select one specific capacitor from among the plurality of capacitors.

Here, the first and second muxes MUX1 and MUX2 vary the rising time Tr and falling time Tf of the first DAC signal DAC1 based on the output time of the second DAC signal DAC2. The specific resistor and the specific capacitor may be selected to have a time constant at which the second DAC signal DAC2 is output.

That is, the first and second muxes MUX1 and MUX2 may select the specific resistor and the specific capacitor to correspond to the time constant from among the plurality of resistors and the plurality of capacitors, but are not limited thereto.

For example, the first and second muxes MUX1 and MUX2 may select the specific resistance and the specific capacitor to correspond to the time constant according to the signal level of the first DAC signal DAC1.

The specific resistor and the specific capacitor serve as a low-pass filter, and by varying the rising time and the falling time of the input first DAC signal DAC1 according to the time constant, the input time of the second DAC signal DAC2 can be shortened.

The second voltage follower 128 may be implemented as an operational amplifier, and may output the second DAC signal DAC2 whose rising time and falling time are varied by the first and second muxes MUX1 and MUX2 as it is.

Here, the second voltage follower 128 may include an output terminal, a non-inverting terminal to which the second DAC signal DAC2 is input, and an inverting terminal connected to the output terminal and returning the second DAC signal DAC2. there is.

5 is a circuit diagram showing the charging unit shown in FIG. 2 in detail, and FIGS. 6 and 7 are exemplary diagrams for explaining the operation of the charging unit shown in FIG. 5 .

Referring to FIG. 5 , the charging unit 132 may include a first instrumentation amplifier INOP1, a first inverting amplifier INOP2, and a first switch FET1.

First, the first instrumentation amplifier INOP1 determines the voltage difference between the second DAC signal DAC2 converted from the first voltage control signal SC1 input from the adjustment module 120 and the first self-compensation voltage. A corresponding first turn-on voltage may be generated.

That is, the first instrumentation amplifier INOP1 uses the first self-compensation voltage to reduce the rise time of the voltage Vgs between the gate and the source of the first switch FET1 to the initially set first turn-on voltage. You can raise your status.

The first instrumentation amplifier INOP1 may include a non-inverting terminal to which the second DAC signal DAC2 is input and an inverting terminal connected to the first inverting amplifier INOP2 to receive the first self-compensation voltage. there is.

At this time, the first instrumentation amplifier INOP1 may supply the first turn-on voltage to the first switch FET1 to turn on the first switch FET1.

The first inverting amplifier INOP2 may include a first inverting amplifier OP1 and a first integrator (not shown).

First, the first inverting amplifier OP1 includes an inverting terminal to which the first charging voltage corresponding to a previous charging pulse is input and a non-inverting terminal to which a ground voltage is input, and inverts the first charging voltage and the ground voltage. The amplified first voltage may be output.

The first integrator may include a first resistor R1 and a first capacitor C1.

First, the first resistor R1 can lower the first voltage to the first self-compensation voltage, and the first capacitor C1 can charge the first self-compensation voltage.

That is, the first capacitor C1 may output the first self-compensation voltage to the first instrumentation amplifier INOP1 when the electric potential of the charging pulse cp output from the first switch FET1 is lowered.

The first switch FET1 may be a field effect transistor including a gate to which the first turn-on voltage is input, a drain connected to a power source Vcc to supply a charging pulse, and a source to supply the charging pulse to the secondary battery. .

Here, FIG. 6 is a circuit diagram in which the first self-compensation voltage Vch is charged when the first switch FET1 of the charger 122 is switched from turned on to turned off.

When the first switch FET1 is turned off while supplying the charging pulse cp to the secondary battery, the first charging voltage corresponding to the charging pulse cp can be supplied to the inverting terminal of the first inverting amplifier OP1. .

At this time, the ground voltage is supplied to the non-inverting terminal of the first inverting amplifier OP1, and as a result, the first inverting amplifier OP1 generates the first voltage Vop obtained by non-inverting amplification of the first charging voltage and the ground voltage. can output

The first resistor R1 may lower the first voltage Vop to the first self-compensation voltage Vch, and the first capacitor C1 may charge the first self-compensation voltage Vch.

FIG. 7 is a first turn-on voltage for a voltage difference between a first self-compensation voltage Vch and a second DAC signal DAC2 when the first switch FET1 of the charging unit 122 is switched from turn-off to turn-on. (ON) may be generated and supplied to the first switch FET1.

That is, when the second DAC signal DAC2 is input while the first switch FET1 is turned off, the first instrumentation amplifier INOP1 outputs the first self-compensation voltage supplied from the first capacitor C1 ( The first turn-on voltage (ON) may be generated by amplifying a voltage difference between the Vch) and the second DAC signal (DAC2).

Thereafter, the first switch FET1 is switched from being turned off to being turned on according to the first turn-on voltage (ON), and a charging pulse (cp) for the power supply unit (Vcc) may be supplied to the secondary battery.

8 is a circuit diagram showing the discharge unit shown in FIG. 2 in detail, and FIGS. 9 and 10 are exemplary diagrams for explaining the operation of the discharge unit shown in FIG. 8 .

Referring to FIG. 8 , the discharge unit 126 may include a second instrumentation amplifier INOP3, a second inverting amplifier INOP4, and a second switch FET2.

First, the second instrumentation amplifier INOP3 determines the voltage difference between the second DAC signal DAC2 converted from the second control signal voltage SC2 input from the adjustment module 120 and the second self-compensation voltage. A corresponding second turn-on voltage may be generated.

That is, the second instrumentation amplifier INOP3 uses the second self-compensation voltage to reduce the rise time of the voltage Vgs between the gate and the source of the second switch FET1 to the initially set second turn-on voltage. You can raise your status.

The second instrumentation amplifier INOP3 may include a non-inverting terminal to which the second DAC signal DAC2 is input and an inverting terminal connected to the second inverting amplifier INOP4 to receive the second self-compensation voltage. there is.

At this time, the second instrumentation amplifier INOP3 supplies the second turn-on voltage to the second switch FET2 to turn on the second switch FET2.

The second inverting amplifier INOP4 may include a second inverting amplifier OP2 and a second integrator (not shown).

First, the second inverting amplifier OP2 includes an inverting terminal to which the second charging voltage corresponding to the previous charging pulse is input and a non-inverting terminal to which a ground voltage is input, and inverts the second charging voltage and the ground voltage. The amplified second voltage may be output.

The second integrator may include a second resistor R2 and a second capacitor C2.

First, the second resistor R2 can lower the second voltage to the second self-compensation voltage, and the second capacitor C2 can charge the second self-compensation voltage.

That is, the second capacitor C2 may output the second self-compensation voltage to the second instrumentation amplifier INOP3 when the potential of the discharge pulse dp output from the second switch FET2 is lowered.

The second switch (FET2) has an electric field including a gate to which the second turn-on voltage is input, a drain connected to the power supply unit (Vdd) to supply the discharge pulse (dp), and a source to supply the discharge pulse (dp) to the secondary battery. It may be an effect transistor.

9 is a circuit diagram in which the second self-compensation voltage Vch is charged when the second switch FET2 of the discharge unit 136 is turned from turned on to turned off.

When the second switch FET2 is turned off while supplying the discharge pulse dp to the secondary battery, the second charging voltage corresponding to the discharge pulse dp can be supplied to the inverting terminal of the second inverting amplifier OP2. .

At this time, the ground voltage is supplied to the non-inverting terminal of the second inverting amplifier OP2, and as a result, the second inverting amplifier OP2 generates the second voltage Vop obtained by non-inverting amplification of the second charging voltage and the ground voltage. can output

The second resistor R2 may lower the second voltage Vop to the second self-compensation voltage Vch, and the second capacitor C2 may charge the second self-compensation voltage Vch.

FIG. 10 shows a second turn-on voltage difference between the second self-compensation voltage Vch and the second DAC signal DAC2 when the second switch FET2 of the discharge unit 136 is switched from turn-off to turn-on. A voltage (ON) may be generated and supplied to the second switch (FET2).

That is, when the second DAC signal DAC2 is input while the second switch FET2 is turned off, the second instrumentation amplifier INOP3 outputs the second self-compensation voltage supplied from the second capacitor C2 ( The second turn-on voltage (ON) may be generated by amplifying a voltage difference between the Vch) and the second DAC signal DAC2.

Thereafter, the second switch FET2 is switched from turn-off to turn-on according to the second turn-on voltage (ON), and may supply a discharge pulse (dp) to the power supply unit (Vdd) to the secondary battery.

Features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified with respect to other embodiments by a person having ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to these combinations and variations should be construed as being included in the scope of the present invention.

In addition, although the above has been described with reference to the embodiments, these are merely examples and do not limit the present invention, and those skilled in the art to which the present invention belongs can exemplify the above to the extent that does not deviate from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications that have not been made are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention as defined in the appended claims.

Claims (6)

a charge/discharge module for charging and discharging a secondary battery;
a control module outputting a voltage control signal for controlling charging and discharging operations of the charging/discharging module; and
An adjustment module that converts the voltage control signal into a first digital analog converter (DAC) signal of analog type and outputs a second DAC signal obtained by varying the rising time and falling time of the first DAC signal to the charge/discharge module. include ,
The adjustment module,
a DAC (Digital Analog Converter) converting the voltage control signal into the first DAC signal;
a first voltage follower that outputs the first DAC signal input from the DAC as it is;
an RC oscillator outputting a second DAC signal obtained by varying a rising time (Tr) and a falling time (Tf) of the first DAC signal input from the first voltage follower; and
A second voltage follower that outputs the second DAC signal input from the RC oscillation unit as it is,
The RC oscillation unit,
a first mux that selects one specific resistor among a plurality of resistors connected in parallel to which the first DAC signal is input; and
A second mux connected in parallel with the first mux and the second voltage follower and selecting one specific capacitor among a plurality of capacitors connected in parallel to each other,
charging device. delete According to claim 1,
The first voltage follower,
An output terminal, a non-inverting terminal to which the first DAC signal is input, and an inverting terminal connected to the output terminal and returning the first DAC signal,
charging device. delete According to claim 1,
The first and second muxes,
The specific resistance and the specific resistance to have a time constant for outputting the second DAC signal for varying the rising time (Tr) and the falling time (Tf) of the first DAC signal based on the output time of the second DAC signal. choosing a capacitor,
charging device. According to claim 1,
The second voltage follower,
An output terminal, a non-inverting terminal to which the second DAC signal is input, and an inverting terminal connected to the output terminal and returning the second DAC signal,
charging device.

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