KR101250914B1 - Dc-dc conversion apparatus having wide input range and method thereof - Google Patents

Abstract

PURPOSE: A DC-DC conversion apparatus having a wide input range and a method thereof are provided to control the voltage conversion ratio of input voltage by using a switch and a capacitor. CONSTITUTION: A voltage conversion unit(110) controls the voltage conversion ratio according to the input voltage by using a switch and a capacitor. A clock signal generation unit(120) generates a clock signal for the switch of the voltage conversion unit to control the voltage conversion ratio. A voltage stabilization unit(130) stabilizes the output voltage of the voltage conversion unit. A voltage selection unit(140) supplies the input voltage to the clock signal generation unit before the output voltage is stabilized, and supplies the output voltage to the clock signal generation unit after the output voltage is stabilized. An output terminal capacitor(160) sends the input voltage to the voltage conversion unit if the voltage reaches a target voltage. [Reference numerals] (110) Voltage conversion unit; (120) Clock signal generation unit; (130) Voltage stabilization unit; (140) Voltage selection unit; (150) Voltage transmission path selection unit; (160) Output terminal capacitor;

Description

DC-DC conversion apparatus having wide input range and Method

The present invention relates to a DC-DC converter, and more particularly, a DC-DC converter having a wide input voltage range, a DC-DC conversion method by adjusting a voltage conversion ratio of an input voltage using a switch and a capacitor. And a recording medium.

Recently, low-power semiconductor design has become a big issue in the semiconductor market at a time when interest in the environment is increasing and low-carbon green growth is important. In addition, more and more cases are using energy harvesting technology, which is an eco-friendly technology that converts discarded energy into electric energy, for small devices. There are many energy harvesters that convert scattered energy such as light energy, thermal energy, kinetic energy (vibration, pressure, etc.) and RF energy into electrical energy. In particular, solar cells that convert light energy into electrical energy are not only easy to obtain and inexpensive, The output voltage higher than the threshold voltage of the MOSFET can be obtained, so the light energy harvesting technology is most utilized. However, the sun's illumination changes greatly according to the weather and time, so the output voltage fluctuates over a wide range, which makes it impossible to use on cloudy days or in the evening.

The first problem to be solved by the present invention is to provide a DC-DC converter having a wide input voltage range.

The second problem to be solved by the present invention is to provide a DC-DC conversion method having a wide input voltage range.

Further, the present invention provides a computer-readable recording medium having recorded thereon a program for executing the above method on a computer.

In order to achieve the first object of the present invention, a voltage conversion unit for reducing the input voltage at a voltage conversion ratio according to the magnitude of the input voltage using a switch and a capacitor, detecting the input voltage, the detected input voltage A clock signal generator for generating a clock signal for the switch of the voltage converter, a voltage stabilizer for stabilizing an output voltage of the voltage converter, and an output voltage to adjust the voltage conversion ratio of the voltage converter according to the size of And a voltage selector for supplying the input voltage to the clock signal generation unit before being stabilized and for supplying the output voltage to the clock signal generation unit after the output voltage is stabilized.

According to one embodiment of the present invention, the clock signal generation unit, a signal generation unit for generating a signal, a quadrature generation unit for generating a dead time (Dead Time) so that different signals generated by the signal generation unit does not overlap, and The DC-DC converter may include a signal controller for controlling the signal to operate the voltage converter at a voltage conversion ratio according to the magnitude of the input voltage.

According to another embodiment of the present invention, the input voltage is transmitted to the output terminal before the capacitor at the output terminal is charged to the target voltage by the input voltage, and the input voltage when the capacitor at the output terminal is charged to the target voltage. It may be a DC-DC converter further comprising a voltage transmission path selection unit for transmitting to the voltage conversion unit.

According to another embodiment of the present invention, the voltage conversion unit has a charging section for charging the capacitor and a discharge section for discharging the capacitor, the switch operating in the charging section and the discharge section in accordance with the voltage conversion ratio It may be a DC-DC converter characterized in that to reduce the input voltage by controlling the.

According to an aspect of the present invention, there is provided a clock signal capable of charging a capacitor at an output terminal using an input voltage, sensing the input voltage, and adjusting a voltage conversion ratio according to the sensed input voltage. Generating a voltage, and reducing the input voltage at a voltage conversion ratio according to the magnitude of the input voltage using a plurality of switches and a plurality of capacitors when the capacitor of the output terminal is charged to a target voltage; The clock signal generates the clock signal by using the input voltage before the output voltage is stabilized, and generates the clock signal by using the output voltage after the output voltage is stabilized. Provide a method.

In order to solve the above other technical problem, the present invention provides a computer-readable recording medium having recorded thereon a program for executing the above-described DC-DC conversion method on a computer.

According to the present invention, by adjusting the voltage conversion ratio of the input voltage using a switch and a capacitor, it has a wide input voltage range. In addition, by generating a clock signal using a stable output voltage, it is stable to the pressure reduction of the input voltage, and is efficient in size and cost because no inductor is used. In addition, it is possible to reduce the energy consumption of the first drive and to quickly generate the output voltage.

1 is a block diagram of a DC-DC converter according to an embodiment of the present invention.
2 is a block diagram of a clock signal generation unit according to another exemplary embodiment of the present invention.
3 is a view showing a switch operating in the charging section and the discharge section according to the voltage conversion ratio according to an embodiment of the present invention.
3A is a diagram illustrating a switch operation of the voltage conversion unit when the voltage conversion ratio is 1/2.
3B is a diagram illustrating a switch operation of the voltage conversion unit when the voltage conversion ratio is 2/3.
3C is a diagram illustrating a switch operation of the voltage conversion unit when the voltage conversion ratio is 1/3.
4A is a diagram illustrating a voltage transmission path selector according to an embodiment of the present invention.
4B is a diagram illustrating a voltage selector according to an embodiment of the present invention.
Figure 4c is a view showing the four-sided section generation unit according to an embodiment of the present invention.
5 is a flowchart of a DC-DC conversion method according to an embodiment of the present invention.
6 is a flowchart of a clock signal generation step according to another embodiment of the present invention.

Prior to the description of the specific contents of the present invention, for the convenience of understanding, the outline of the solution of the problem to be solved by the present invention or the core of the technical idea will be presented first.

In the DC-DC converter according to an embodiment of the present invention, a voltage converter for reducing the input voltage at a voltage conversion ratio according to the magnitude of the input voltage using a switch and a capacitor, detecting the input voltage, A clock signal generator for generating a clock signal for the switch of the voltage converter to adjust the voltage conversion ratio of the voltage converter according to the magnitude of an input voltage, a voltage stabilizer for stabilizing an output voltage of the voltage converter, and the output And a voltage selector for supplying the input voltage to the clock signal generator before the voltage is stabilized and for supplying the output voltage to the clock signal generator after the output voltage is stabilized.

DC-DC converter according to an embodiment of the present invention can be used in a system having a wide range of changes in the input voltage by the external environment, such as energy harvesting system.

In the light harvesting system, stable operation must be guaranteed in an input environment that changes rapidly according to the environment, and the conversion efficiency must be high because the input is not large, and the area must be small for use in portable devices. When the change in the magnitude of the input voltage is large according to the external environment, such as the light harvesting system, it is necessary to output the output voltage close to the target voltage even if the input voltage changes. In addition, in the case of directly using an input voltage having a large variation in a circuit for generating a clock signal, power loss is high, and stability of the entire system is also a problem. Therefore, the DC-DC converter of the present invention, which can accommodate a wide input range and generates a clock signal using a stable output voltage, can be used in the light harvesting system. In addition, the input voltage is reduced using only a switch and a capacitor without using an inductor, thereby reducing an area and reducing power loss. Furthermore, it can be used not only in light harvesting systems but also in various low power systems using DC-DC converters.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, these examples are intended to illustrate the present invention in more detail, it will be apparent to those skilled in the art that the scope of the present invention is not limited thereby.

The configuration of the invention for clarifying the solution to the problem to be solved by the present invention will be described in detail with reference to the accompanying drawings based on the preferred embodiment of the present invention, the same in the reference numerals to the components of the drawings The same reference numerals are given to the components even though they are on different drawings, and it is to be noted that in the description of the drawings, components of other drawings may be cited if necessary. In addition, in describing the operation principle of the preferred embodiment of the present invention in detail, when it is determined that the detailed description of the known function or configuration and other matters related to the present invention may unnecessarily obscure the subject matter of the present invention, The detailed description is omitted. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, "comprises" or "comprising" means the presence of one or more other components, steps, operations and / or elements other than the components, steps, operations and / or elements mentioned or Does not exclude additional

1 is a block diagram of a DC-DC converter according to an embodiment of the present invention.

In the DC-DC converter according to an embodiment of the present invention, the voltage converter 110, the clock signal generator 120, the voltage stabilizer 130, the voltage selector 140, and the voltage transmission path selector ( 150).

The voltage conversion unit 110 reduces the input voltage at a voltage conversion ratio according to the magnitude of the input voltage using a switch and a capacitor.

More specifically, the input voltage is reduced to the target output voltage by using a voltage conversion ratio according to the magnitude of the input voltage in order to make the target output voltage even if the magnitude of the input voltage changes. When the input voltage within the available voltage range is input, the voltage conversion ratio to be applied varies depending on the magnitude of the voltage. The voltage conversion ratio may be adjusted by controlling operations of a plurality of switches according to a clock signal generated by the clock signal generation unit 120 in charging and discharging a capacitor inside the voltage conversion unit 110. It uses only switches and capacitors to convert voltages without using an inductor, which is cost and area efficient. In addition, in a DC-DC converter using an inductor, when the current is small, a phenomenon in which the voltage conversion efficiency drops rapidly may occur. Therefore, the voltage converter 110 according to an embodiment of the present invention reduces the input voltage using only a switch and a capacitor, and thus is effective for use in a low power system such as a light harvesting system. The switch and capacitor may operate as a switched capacitor. In addition, the voltage converter 110 adjusts the decompression ratio, and may be used as a decompression converter (step-down converter).

The voltage converter 110 has a charging section for charging the capacitor and a discharge section for discharging the capacitor, and reduces the input voltage by controlling a switch operating in the charging section and the discharge section according to the voltage conversion ratio. do. Detailed description of the voltage converter 110 will be described in detail with reference to FIG. 3.

The clock signal generation unit 120 senses the input voltage, and the clock signal for the switch of the voltage conversion unit 110 to adjust the voltage conversion ratio of the voltage conversion unit 110 according to the magnitude of the detected input voltage. Create

More specifically, the voltage conversion ratio is determined according to the magnitude of the input voltage, thereby detecting the input voltage. The voltage conversion ratio is determined according to the sensed input voltage, and a clock signal for the switch of the voltage conversion unit 110 is generated to reduce the input voltage according to the voltage conversion ratio. A clock signal for the switch operating in the charging section and a clock signal for the switch operating in the discharge section are generated according to the voltage conversion ratio. A detailed description of the clock signal generator 120 will be described in detail with reference to FIG. 2.

The voltage stabilizer 130 stabilizes the output voltage of the voltage converter 110.

More specifically, in generating the clock signal in the clock signal generator 120, the voltage stabilizer 130 stabilizes the output voltage in order to use a stable low voltage. A low dropout regulator (LDO) may be used, but a simple feedback loop is used to stabilize the output voltage. The voltage stabilizer 130 may be implemented as a comparator and a NOR gate.

The voltage selector 140 supplies the input voltage to the clock signal generator 120 before the output voltage is stabilized, and supplies the output voltage to the clock signal generator 120 after the output voltage is stabilized. .

More specifically, when the output voltage is stable, a clock signal may be generated using the stable output voltage to generate a stable clock signal, but the clock is used by using the input voltage until the output voltage becomes a target voltage and stabilizes. Generate a signal. Therefore, it is determined whether the output voltage is stable, and the voltage (power) applied between the input voltage and the output voltage is selected and supplied to the clock signal generator 120. A power multiplexer may be used to select the voltage.

The voltage transmission path selector 150 transmits the input voltage to the output terminal before the capacitor 160 of the output terminal is charged to the target voltage by the input voltage, and the capacitor 160 of the output terminal is charged to the target voltage. In this case, the input voltage is transmitted to the voltage converter 110.

More specifically, when starting the DC-DC converter according to an embodiment of the present invention, in order to quickly approach the target voltage, which is an output voltage to be supplied to the load, the input voltage is first transmitted directly to the output terminal. The input voltage sent directly to the output stage charges the capacitor 160 of the output stage. Rather than transmitting the input voltage to the output terminal through the voltage converter 110 from the beginning, it is possible to start quickly by transmitting the input voltage directly to the output terminal. Fast start-up circuits are available for fast start. In addition, the output voltage can be stabilized quickly, it is possible to quickly supply a stable output voltage to the clock signal generation unit 120.

When the capacitor 160 of the output terminal is charged to the target voltage, the input voltage is transmitted to the voltage converter 110. After the capacitor 160 of the output terminal is completely charged, if the input voltage is directly transmitted to the output terminal, a voltage higher than a target voltage is supplied, and thus the pressure of the input voltage needs to be reduced. In order to reduce the input voltage, the input voltage is transmitted to the voltage converter 110 to reduce the input voltage. That is, after the capacitor 160 of the output terminal is charged, the voltage converter 110 reduces the input voltage to the target voltage and transmits the output voltage to the output terminal.

2 is a block diagram of a clock signal generation unit according to another exemplary embodiment of the present invention.

The clock signal generator 120 may be configured of a signal generator 111, a quadrilateral generator 112, and a signal controller 113.

The signal generator 111 generates a signal.

More specifically, a signal capable of generating a clock signal is generated. An oscillator may be used as the signal generator 111. A signal of a certain magnitude may be generated, and one or more signals may be generated according to a required clock signal.

The quadrilateral generator 112 generates a dead time so that different signals generated by the signal generator 111 do not overlap.

More specifically, when the clock signals generated by the signal generator 111 overlap, a short circuit current may occur in charging and discharging the capacitor of the voltage converter 110. A dead time is generated between the previous signal and the next signal in order to prevent the short circuit current from occurring and immediately exiting the ground GND.

The signal controller 113 controls the signal so that the voltage converter 110 can operate at a voltage conversion ratio according to the magnitude of the input voltage.

More specifically, the signal generated by the signal generator 111 is controlled to generate a clock signal for each switch so as to control the switches operating in the charging and discharging sections of the voltage converter 110. The switch sensing the input voltage and operating in the charging section and the discharge section vary according to the voltage conversion ratio according to the magnitude of the input voltage. Therefore, in order to generate a clock signal that can control the switch operating in the charging section and the discharge section according to the voltage conversion ratio differently, the signal generated by the signal generator 111 is controlled.

The input voltage can be measured only by a voltage sensing device without a current sensor. By not using a current sensor, power loss can be reduced.

DC-DC converter according to an embodiment of the present invention can be used as an auxiliary means of the existing power supply, it can also be used as the main power source of the electronic device installed outdoors. Since the area is small, it is suitable for integrated circuits and can be implemented on chip. In addition, since it is stable to the external environment, a compensation circuit is not required.

3 is a view showing a switch operating in the charging section and the discharge section according to the voltage conversion ratio according to an embodiment of the present invention.

The voltage converter 110 reduces the input voltage using a plurality of capacitors and switches. As shown in FIG. 3, the operation of the voltage converter 110 will be described using an embodiment in which the input voltage is reduced at three voltage conversion ratios using two capacitors and nine switches. The voltage converter 110 reduces the input voltage by controlling a switch operating in a charging section and a discharging section. Table 1 shows the operation of each switch in the charging and discharging sections.

Input voltage CLK1 CLK2 CLK3 CLK4 CLK5 charge Discharge charge Discharge charge Discharge charge Discharge charge Discharge 2.4 <input voltage <3 H L L H L H H L turn off 3 <input voltage <4.5 H L L H turn off H L L H 4.5 <input voltage H L L H L H turn off H L

The input conversion ratio is varied by dividing the magnitude of the input voltage into three sections of 2.4 to 3, 3 to 4.5, and 4.5 or more. The operation of the switch is divided into H (High), L (Low), and turn off. H is connected to the switch because the clock signal is high, L is disconnected because the clock signal is low. Turn off means that the switch is not working because there is no clock signal.

3A illustrates a switch operation of the voltage conversion unit when the voltage conversion ratio is 1/2, and FIG. 3B illustrates a switch operation of the voltage conversion unit when the voltage conversion ratio is 2/3, and FIG. 3C illustrates a voltage conversion. The figure shows the switch operation of the voltage conversion section when the ratio is 1/3.

When the voltage conversion ratio is 2/3, the operation of the switch will be described with an example. When the voltage conversion ratio is 2/3, the input voltage is 2.4 to 3 in Table 1. In the charging section, clock signals CLK1 and CLK4 are high, clock signals CLK2 and CLK3 are low, and clock signal CLK5 is turned off. Therefore, a circuit is constructed as shown in the charging section of FIG. 3B, and the voltage applied to each capacitor is V _CP = (V _in -V _out ). In the discharge section, clock signals CLK2 and CLK3 are high, clock signals CLK1 and CLK4 are low, and clock signal CLK5 is turned off. The circuit is configured as in the discharge section of FIG. 3B, and the voltage across each capacitor is V _CP = V _out . Looking at the voltage conversion ratio as an equation:

이 되고, 도 3c의 전압변환비율은

이 된다. Here, C _P is a capacitor of the voltage converter 110, R _L is a load resistance, T is a switching period. Accordingly, the voltage conversion ratio is 2/3 by the clock signal as shown in FIG. 3B, and the input voltage is reduced at the voltage conversion ratio. Similarly, the voltage conversion ratio of FIG.

The voltage conversion ratio of FIG. 3C is

.

3 to 3C illustrate one embodiment, the more capacitors used in the voltage converter 110, the more the voltage conversion ratio is varied, and the input voltage can be reduced closer to the target voltage. Therefore, the capacitor used in the voltage converter 110 may be adjusted according to the error tolerance of the output voltage.

4A is a diagram illustrating a voltage transmission path selector according to an embodiment of the present invention.

4A is a block diagram of the voltage transmission path selector 150. In the first operation, the switch opens to transfer the input voltage directly to the output stage, but the output of the comparator is used as the trigger signal of the edge triggered flip-flop as soon as the output capacitor is charged to the target voltage. The path connecting the output terminal is disconnected and the input voltage is transmitted to the voltage converter. If the input voltage and the output voltage are directly connected, the output voltage can quickly reach the target voltage. In addition, since the output voltage quickly reaches the target voltage, the output voltage can be stabilized quickly and supplied to the clock signal generator 120. Therefore, the clock signal is generated using a low and stable output voltage as compared to the clock signal generated using a high input voltage, thereby reducing power loss and increasing load stability.

4B is a diagram illustrating the voltage selector 140 according to the embodiment of the present invention.

The voltage selector 140 supplies a voltage to the clock signal generator 120. When the clock signal generator 120 generates a clock signal using an input voltage, since the input voltage is unstable due to a change in external environment, the operating frequency of the entire system continuously fluctuates, and the input voltage In this high case, the waste of power consumed to generate the clock signal is also increased. Therefore, during the first operation, the clock signal is generated using the input voltage. When the output voltage becomes a suitable voltage for generating the clock signal, the clock signal is generated using the output voltage instead of the input voltage. Since the output voltage is quickly stabilized by the voltage transmission path selector 150, the clock signal may be generated using the stable voltage. The stable and low output voltage may also be used in other logic circuits to reduce power loss and enable stable driving.

Figure 4c is a view showing the four-sided section generation unit according to an embodiment of the present invention.

The voltage converter 110 operates in two sections of the charging section and the discharge section. When the sections overlap each other, the input may immediately exit to the outside or the ground GND due to the short circuit current. This has a significant effect on the efficiency of the DC-DC converter. Therefore, a four-section is formed between the charging section and the discharge section to prevent short circuit current.

5 is a flowchart of a DC-DC conversion method according to an embodiment of the present invention.

Step 510 is a step of charging the capacitor of the output terminal using the input voltage.

More specifically, during the first operation, the output voltage quickly reaches the target voltage, and the input voltage is directly transmitted to the output terminal to charge the capacitor of the output terminal so that the output voltage can be stabilized quickly and used to generate a clock signal. Since the detailed description of this step corresponds to the detailed description of the voltage transmission path selector 150 of FIG. 1, the detailed description of the voltage transmission path selector 150 of FIG.

In operation 520, the input voltage is sensed and a clock signal capable of adjusting a voltage conversion ratio according to the detected magnitude of the input voltage is generated.

More specifically, since the voltage conversion ratio is determined according to the input voltage, a clock signal is generated to sense the input voltage and to reduce the input voltage at a voltage conversion ratio corresponding to the input voltage. The clock signal generates the clock signal using the input voltage before the output voltage is stabilized, and generates the clock signal using the output voltage after the output voltage is stabilized. Since the detailed description of this step corresponds to the detailed description of the clock signal generation unit 120 of FIG. 1, the detailed description of the clock signal generation unit 120 of FIG. 1 is substituted.

In operation 530, when the capacitor of the output terminal is charged to a target voltage, the input voltage is reduced by using a plurality of switches and a plurality of capacitors at a plurality of voltage conversion ratios according to the magnitude of the input voltage.

More specifically, the input voltage is reduced by the clock signal generated in step 520. Since the detailed description of this step corresponds to the detailed description of the voltage converter 110 of FIG. 1, the detailed description of the voltage converter 110 of FIG.

6 is a flowchart of a clock signal generation step according to another embodiment of the present invention.

Operation 610 is an operation of generating a plurality of signals.

More specifically, the step of generating a signal for generating a clock signal. Since the detailed description of this step corresponds to the detailed description of the signal generation unit 111 of FIG. 2, the detailed description of the signal generation unit 111 of FIG. 2 is substituted.

Step 620 is a step of generating a dead time so that the generated different signals do not overlap.

More specifically, a quadrant is generated to prevent a short circuit current that may occur when the clock signals for the switches overlap. Since the detailed description of this step corresponds to the detailed description of the four-way section generation unit 112 of FIG. 2, the detailed description of the four-way section generation unit 112 of FIG. 2 is replaced.

In operation 630, the signal is controlled to generate the clock signal at a voltage conversion ratio according to the magnitude of the input voltage.

More specifically, since the switches operating in the charging and discharging sections differ according to the voltage conversion ratio, the signals generated in step 610 are controlled to generate clock signals for the switches. Since the detailed description of this step corresponds to the detailed description of the signal controller 113 of FIG. 2, the detailed description of the signal controller 113 of FIG. 2 is replaced.

Embodiments of the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, 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 described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

110: voltage conversion unit
120: clock signal generation unit
130: voltage stabilizer
140: voltage selector
150: voltage transmission selector

Claims (8)

A voltage converting unit configured to reduce the input voltage at a voltage conversion ratio according to the magnitude of the input voltage using a switch and a capacitor;
A clock signal generation unit for sensing the input voltage and generating a clock signal for a switch of the voltage conversion unit so as to adjust a voltage conversion ratio of the voltage conversion unit according to the detected magnitude of the input voltage;
A voltage stabilizer which stabilizes an output voltage of the voltage converter; And
And a voltage selector which supplies the input voltage to the clock signal generator before the output voltage is stabilized and supplies the output voltage to the clock signal generator after the output voltage is stabilized. The method of claim 1,
The clock signal generation unit,
A signal generator for generating a signal;
A quadrilateral generator for generating a dead time so that different signals generated by the signal generator do not overlap each other; And
And a signal controller for controlling the signal to operate the voltage converter at a voltage conversion ratio according to the magnitude of the input voltage. The method of claim 1,
Before the capacitor at the output terminal is charged to the target voltage by the input voltage, the input voltage is transmitted to the output terminal. When the capacitor at the output terminal is charged to the target voltage, the voltage transmission unit transmits the input voltage to the voltage converter. DC-DC converter further comprises a path selection unit. The method of claim 1,
The voltage conversion unit,
A charge period for charging the capacitor and a discharge period for discharging the capacitor, and controlling a switch operating in the charge period and the discharge period according to the voltage conversion ratio to reduce the input voltage. DC inverter. Charging a capacitor at an output terminal using an input voltage;
Generating a clock signal capable of sensing the input voltage and adjusting a voltage conversion ratio according to the detected magnitude of the input voltage; And
When the capacitor of the output terminal is charged to a target voltage, using the plurality of switches and a plurality of capacitors, reducing the input voltage at a voltage conversion ratio according to the magnitude of the input voltage;
The clock signal generates the clock signal by using the input voltage before the output voltage is stabilized, and generates the clock signal by using the output voltage after the output voltage is stabilized. Way. The method of claim 5, wherein
Generating the clock signal,
Generating a signal;
Generating a dead time so that the generated different signals do not overlap; And
And controlling the signal to generate the clock signal at a voltage conversion ratio according to the magnitude of the input voltage. The method of claim 5, wherein
Reducing the input voltage,
A charging period for charging the plurality of capacitors and a discharge period for discharging the capacitors charged in the charging period, and reducing the input voltage by controlling a switch operating in the charging period and the discharge period according to the voltage conversion ratio. DC-DC conversion method characterized in that. A computer-readable recording medium having recorded thereon a program for executing the method of any one of claims 5 to 7.

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