Power supply device

Abstract

According to one aspect of the present invention, there is provided a power supply device including a first terminal and a second terminal for receiving an input of a control signal, a switch that operates to be turned on or off by comparing a magnitude between a voltage between the first terminal and the second terminal and a threshold voltage, and a protection element connected to the first terminal to change a magnitude of a source voltage of the first terminal, and the magnitude of the source voltage of the first terminal can be adjusted to be higher than when the protection element is not present.

Description

[Technical field]

[0001] The present invention relates to a power supply device used in electronic equipment and a driving method thereof. [Background technology]

[0002] If the Switched Mode Power Supply (SMPS), which is the power supply device for LED lighting devices, is exposed to an environment with high levels of radiation for a certain amount of time, the SMPS will be destroyed. If the SMPS is destroyed, power will not be supplied to the LED lighting device, causing a fatal problem that the lighting device will no longer function. Therefore, in order to use electronic devices such as LED lighting devices in places with special spatial characteristics such as high-level radiation areas such as nuclear power plants, it is essential to solve the problem of the power supply device being destroyed within the device.

[0003] Although the nuclear power plant and LED lighting are used as examples to explain the present invention, this is not intended to limit the present invention. All electronic devices require a power supply device to supply power. Therefore, it should be understood that the present invention relates to a power supply device and a driving method for electronic devices used in a place where environmental stress may occur due to the special nature of the space. Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power supply device and a driving method thereof for electronic devices used in places where environmental stress may occur, such as outer space where there is high cosmic radiation due to solar activity, or a reactor containment vessel of a nuclear power plant where there is strong electromagnetic waves or radiation.

[0005] The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0006] To solve the above-mentioned problems, a power supply device according to one aspect of the present invention includes a first terminal and a second terminal for receiving an input of a control signal, and includes a switch that operates to turn on or off by comparing a magnitude between a voltage between the first terminal and the second terminal and a threshold voltage, and a protection element connected to the first terminal to change a magnitude of a source voltage of the first terminal, and the magnitude of the source voltage of the first terminal can be adjusted to be higher than when the protection element is not present.

[0007] A power supply device according to one embodiment of the present invention may further include a switching conversion unit that generates an output power supply using an input power supply of an input power supply unit including the switch and the protection element, a drive control unit that generates an operation control signal for the switching conversion unit, and a power generation unit that supplies power supply to at least one of the switching conversion unit and the drive control unit.

[0008] In addition, the protection element is formed to be connected to the ground and the first terminal of the switching conversion unit, and is configured so that when the control signal is applied to turn on the switch, the source voltage is applied to the first terminal, and may include at least one of a plurality of resistor elements of a predetermined magnitude and a plurality of diodes having a threshold voltage of a predetermined magnitude.

[0009] Moreover, the switch can operate to be turned on or off by comparing a voltage difference between the first terminal and the second terminal with the threshold voltage.

[0010] Furthermore, the drive control unit can determine the control signal so that the maximum value of the voltage difference between the first terminal and the second terminal, which is the voltage value for turning on the switch, exceeds the magnitude of the absolute value of the changed threshold voltage.

[0011] The switching converter may further include a feedback resistor connected to the drive controller and disposed between the protection element and the ground.

[0012] Furthermore, the switching conversion unit may further include a buffer capacitor connected in parallel with the feedback resistance element and provided between the protection element and the ground.

[0013] A power supply device according to one embodiment of the present invention further includes a product load that is driven by receiving the output power, and in this case, the drive control unit can determine the control signal that can provide the output power corresponding to the product load via the input power supply and an inductor based on the current flowing through the feedback resistor element.

[0014] The switch also includes a third terminal connected to an inductor, and in this case, the drive control unit can determine the control signal that determines the amount of current transmitted through the third terminal based on the current flowing through the feedback resistance element independently of the change in the threshold voltage.

[0015] In addition, the protection element may be formed by connecting in parallel a first diode group including at least one diode connected in series in a first direction and a second diode group including at least one diode connected in series in a second direction opposite to the first direction. Other specific features of the present invention are included in the detailed description and drawings. Effect of the Invention

[0016] According to an embodiment of the present invention, a power supply device for electronic devices used in a space where environmental stress may occur can be prevented from malfunctioning or being destroyed due to environmental stress, and power can be stably supplied to the electronic devices in a stressful environment.

[0017] Furthermore, according to the embodiment of the present invention, electronic devices can be used even in environments where there is concern that the power supply device may be damaged.

[0018] Furthermore, according to the embodiment of the present invention, it is possible to reduce leakage current of a semiconductor switch element used in a power supply device.

[0019] The effects of the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. [Brief description of the drawings]

[0020] [Figure 1] 1 is a block diagram of a power supply device according to an embodiment; [Figure 2a] FIG. 1 is a circuit diagram of a boost converter according to an embodiment. [Figure 2b] 1 is a flyback circuit using a power supply device according to another embodiment. [Figure 2c] 1 is a graph showing threshold voltages and control signals depending on the presence or absence of a protection element according to an embodiment; [Figure 3a] FIG. 1 shows that the protection element comprises a diode according to one embodiment. [Figure 3b] FIG. 1 shows that the protection element comprises a diode according to one embodiment. [Figure 3c] FIG. 1 shows that the protection element comprises a diode according to one embodiment. [Figure 4a] FIG. 13 shows that the protection element comprises a resistor according to one embodiment. [Figure 4b] FIG. 13 shows that the protection element comprises a resistor according to one embodiment. [Figure 5a] FIG. 13 illustrates a feedback resistor and snubber capacitor connected according to one embodiment. [Figure 5b] FIG. 13 is a diagram illustrating the operation of a buffer capacitor according to one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The advantages and features of the present invention, and the methods for achieving them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and may be realized in various different forms. However, the embodiments are provided to complete the disclosure of the present invention and to allow those skilled in the art to fully understand the scope of the present invention, and the present invention is only defined by the scope of the claims.

[0022] The terms used in this specification are for the purpose of describing the embodiments and are not intended to limit the present invention. In this specification, the singular includes the plural unless otherwise specified. The terms "comprises" and / or "comprising" used in this specification do not exclude the presence or addition of one or more other components other than the components mentioned. The same reference numerals throughout this specification refer to the same components, and "and / or" includes each and every combination of one or more of the components mentioned. Even if "first", "second", etc. are used to describe various components, it is understood that these components are not limited by these terms. These terms are used simply to distinguish one component from another component. Therefore, it goes without saying that the first component mentioned below may also be the second component within the technical spirit of the present invention.

[0023] Unless otherwise defined, all terms (including technical and scientific terms) used in this specification are used as meanings commonly understood by ordinary skilled artisans in the technical field to which the present invention belongs. Furthermore, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless clearly and specifically defined.

[0024] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0025] Conventional techniques for solving the problem of damage to power supplies for electronic devices used in radiation-induced environments have been approached using passive avoidance methods that aim to minimize and protect radiation-sensitive components among the components that make up the power supply from exposure to radiation (Patent Document 0001). However, conventional radiation shielding methods are limited in that they are only partially applicable in environments with a low level of radiation absorbed dose below a certain level, as they are unable to completely shield radiation. Therefore, a more reliable method of solving the problem is needed.

[0026] To explain the embodiment of the present invention proposed to solve the problem, the reason why a power supply device is destroyed in a high-level radiation environment is as follows: When multiple component elements constituting the power supply device are exposed to a radiation environment, the electrical characteristics of the elements change due to the influence of the radiation. Therefore, when an overcurrent flows, the switch element is destroyed, and the power supply device is also destroyed and does not work.

[0027] Based on the results of such cause analysis, preferred embodiments for implementing the present invention will be described with reference to the drawings.

[0028] 1 is a block diagram of a power supply device according to an embodiment of the present invention. The power supply device according to the embodiment includes a switching converter (200) that uses an input power of direct current or alternating current (AC or DC) supplied through an input power unit (Input Power, 100) and generates an output power using an operation of the switch (SW, 250), a driving controller (300) that generates a control signal (VSIG) for controlling the operation of the switch 250 of the switching converter 200, and a voltage generator (400) that supplies power required for the switching converter 200 and the driving controller 300.

[0029] In this case, the switch 250 of the switching conversion unit 200 of the embodiment can be realized as a semiconductor switch element. The semiconductor switch element is realized as an N-type or P-type metal-oxide-semiconductor field effect transistor (hereinafter referred to as MOSFET), an NPN-type or PNP-type bipolar junction transistor (hereinafter referred to as BJT), or an IGBT (Insulated gate bipolar transistor).

[0030] The switching converter 200 of the embodiment includes various types of power supply devices having a structure for operating the switch 250 to output a target output power. For example, the various types of power supply devices include an SMPS and a linear regulator. For example, the SMPS includes non-isolated and isolated types depending on whether an inductor or capacitor is used or a transformer is used, and the non-isolated types include buck, boost, buck-boost, Cuk, and sepic types, and the isolated types include flyback, push-pull, and isolated Cuk types.

[0031] At this time, the drive control unit 300 of the embodiment generates a control signal for controlling the switching conversion unit 200 .

[0032] At this time, the power generation unit 400 of the embodiment generates power required for the switching conversion unit 200 and the drive control unit 300 .

[0033] With reference to FIG. 1, the driving method of the power supply device according to an embodiment of the present invention will be described in detail using a boost converter as an example for explaining the operation of the preferred embodiment of the present invention in more detail. The use of a boost converter among various types of power supply devices for the purpose of explanation is for the purpose of facilitating understanding and is not intended to limit the present invention. In the description, the description of elements that are the same as or similar to those described above may be omitted.

[0034] FIG. 2a is a circuit diagram of a boost converter according to one embodiment, FIG. 2b is a flyback circuit using a power supply device according to another embodiment, and FIG. 2c is a graph showing threshold voltage and control signal depending on the presence or absence of a protection element according to one embodiment.

[0035] 2a and 2b, the switching converter 200 may use an N-type MOSFET as a switch (SW, 250) that controls the flow of current, and a diode (D, 220) that operates complementary to the switch 250 and controls the flow of current.

[0036] In the case of the boost circuit shown in FIG. 2a, it may include an inductor (L, 210) and a capacitor (C, 230) for storing energy, a drive control unit 300 for generating a control signal for controlling the switch 250, and a power generation unit 400 for supplying power to the drive control unit 300.

[0037] Meanwhile, the switch 250 may include a first terminal corresponding to a source terminal and a second terminal receiving an input of a control signal.

[0038] Control signal V SIG may represent a signal transmitted from the driving control unit 300 to control the switch 250. The second terminal may correspond to a gate terminal.

[0039] The switch 250 can perform an on / off operation by comparing the magnitude of the voltage between the first terminal and the second terminal with the threshold voltage of the switch 250 element.

[0040] The switch 250 is connected to a threshold voltage V th It can operate based on the difference between

[0041] Specifically, when the voltage difference between the first terminal and the second terminal is greater than the threshold voltage, the switch 250 is turned on, and when the voltage difference between the first terminal and the second terminal is smaller than the threshold voltage, the switch 250 is turned off.

[0042] Meanwhile, the switch 250 can be connected to a protection element P2, which serves to make the voltage of the first terminal, the source terminal, of the switch 250 higher than when the existing protection element is not connected, by the flow of current.

[0043] Such a protection element P2 can be connected to a first terminal, which is a source terminal of the switching element of the switching conversion unit 200.

[0044] Here, the voltage at the source terminal of the switch to which the protection element P2 is connected can be increased more than the voltage at the source terminal when the protection element is not provided.

[0045] When the switch 250 is irradiated with radiation, the characteristics of the switch threshold voltage change from the characteristics of the threshold voltage before the radiation exposure. For example, in the case of an N-type MOSFET, the threshold voltage decreases when irradiated with radiation, and may even change to a negative voltage depending on the amount of radiation.

[0046] In this case, without a protective element, the low voltage level of the control signal from the drive controller applied to the second signal of the switch would not be able to completely turn off the switch whose threshold voltage has been lowered by radiation.

[0047] Without the protective element, the voltage level of the control signal would not be lower than the level of the threshold voltage changed by radiation exposure, and so the switch would not be able to be turned off, and excessive current would flow through the switch.

[0048] In other words, without the protection element, an excessive current would flow through the switching converter regardless of the control signal, which could damage the switch.

[0049] However, if a protection element is provided in the switching converter 200 as shown in FIG. 2a, the voltage of the first terminal of the switch 250 becomes higher than the voltage of the second terminal of the switch, thereby preventing an overcurrent from flowing through the switching converter 200.

[0050] The switch 250 is connected to a voltage difference between the first terminal and the second terminal and a threshold voltage V th It can be turned on or off by comparing with.

[0051] Referring to FIG. 2c, R21 is shown when the threshold voltage of the switch is normal, and R22 and R23 are shown when the threshold voltage of the switch is lowered due to irradiation (A, B, and C are positive numbers, and the magnitude of the absolute value of each value satisfies C>B>A).

[0052] When radiation is not being irradiated to a normal switch 250 having a magnitude of AV, R21, the switch turns on when Vgs exceeds AV based on the control signal output by the drive control unit, and turns off when Vgs is less than AV.

[0053] On the other hand, if the switch 250 is irradiated with radiation and the threshold voltage Vth decreases from the existing threshold voltage to -BV from AV, when a control signal such as R21 is received as an input, Vgs is always greater than the threshold voltage, so the switch turns on (R22).

[0054] In this case, too much current may flow through the switching converter, causing it to become overloaded.

[0055] Therefore, when the voltage of the source terminal of the switch is increased through the protection element to reduce Vgs applied to the switch, the switch can be turned on or off according to the control signal, allowing the switching converter 200 to operate normally (R23).

[0056] On the other hand, the protection element P2 can be composed of a resistor element of a predetermined magnitude, a diode element, or a combination of a resistor element and a diode element.

[0057] Meanwhile, the driving control unit 300 may determine the control signal such that the maximum value of the voltage difference between the first terminal and the second terminal exceeds the absolute value of the changed threshold voltage.

[0058] For example, the threshold voltage V th When the voltage Vgs is -BV lower than AV, in order to prevent a short circuit in the switching converter during the off period of the switch 250, the potential difference between the first and second terminals, i.e., Vgs, must be smaller than -BV.

[0059] According to one embodiment, when the minimum value of the source voltage of switch 250 is −CV due to protection element P2, a control signal is applied to the source voltage so that the switch turns on when Vgs is greater than −BV and turns off when Vgs is less than −BV (R23).

[0060] In this embodiment, if the magnitude of the control signal is smaller than the difference between -BV and -CV, Vgs is always smaller than -BV and the switch is always off, so the maximum value of the control signal must at least exceed the difference between -BV and -CV for the switch to operate normally. Therefore, the drive control unit can control the operation of the switching conversion unit by outputting a control signal such that the maximum value of the voltage difference between the first and second terminals exceeds the absolute value of the changed threshold voltage.

[0061] The driving control unit 300 can determine the control signal that can provide an output power corresponding to the product load via the input power source 100 and the inductor 210 .

[0062] In the following, the booster operation implemented in FIG. 2a will be described.

[0063] 2a, the boost converter is an SMPS that boosts and outputs a voltage received as an input, and controls the on-off duty ratio of the switch 250 according to a control signal to determine the magnitude of boost of the output voltage VOUT based on the input voltage Vin according to the following equation 1.

[0064]

number

[0065] Here, the input voltage Vin may be an AC voltage or a DC voltage. In this case, if the input voltage is an AC voltage, the input power supply unit may further include a rectifier unit (not shown), and the rectifier unit may be realized in various ways depending on the application. In this embodiment, the case of a DC voltage is used as an example.

[0066] The operation of the boost converter according to the embodiment will be described as follows. The power supply generating unit 400 generates a power supply and supplies the power supply to the driving control unit 300. The driving control unit 300 outputs a control signal V SIG can be generated.

[0067] At this time, the voltage level of the control signal V SIG When switch 250 is turned on by this, current IL passing from input voltage Vin through inductor 210 does not flow in the direction of diode 220 (ID≒0), except for the leakage current of diode 220, and only current IM flows through switch 250 (IL≒IM), and energy is stored in inductor 210.

[0068] Thereafter, when the switch 250 is turned off by the control signal, the current I M does not flow through the switch 250. On the other hand, the energy stored in the inductor 210 and the input voltage V in are added together to cause a current I D passing through the diode 220 (I L ≒ I D ), and the output voltage V OUT At this time, the capacitor 230 is connected to the output voltage V OUT and supplies a stable output voltage to the product load.

[0069] The control signal V generated by the drive control unit 300 SIG is directly connected to the gate of the switch 250 of the switching converter 200 to control its operation. At this time, the control signal V SIG swings from 0V to VDD.

[0070] Meanwhile, the operation described in FIG. 2A to FIG. 2C is merely an embodiment in which the switching converter of the present invention operates as a booster circuit, and there is no limitation on the implementation in which the switching converter operates as a booster circuit.

[0071] 3a to 3c show that the protection element according to one embodiment comprises a diode.

[0072] Referring to FIG. 3a, it is shown that the protection element P3a connected to the switch 250 is connected as a diode.

[0073] A diode has a particular threshold voltage, and when a current flows through it, an increased voltage can be applied to the source terminal of switch 250, at or above the diode's threshold voltage, depending on the amount of current.

[0074] On the other hand, the protection element P3a can be determined taking into consideration the range in which the threshold voltage of the switch is changed.

[0075] In the following description, it is assumed that the magnitude of the feedback resistor is very small.

[0076] For example, switch 250 may be irradiated with radiation to change its threshold voltage to −BV as shown in FIG. 2c, and the protection element may be constructed by connecting four diodes in series, each with a threshold voltage of DV.

[0077] D is a positive number, and in the following description, it is assumed that the absolute value of B is smaller than the absolute value of 4D.

[0078] Through the above-described configuration, the increase in voltage caused by the protection element P3a can be configured to exceed the absolute value of the threshold voltage.

[0079] With the above-mentioned configuration, an increased voltage of 4DV can be applied to the source terminal of the switch. When the voltage at the source terminal of the switch increases, if the control signal is input to 0V, Vgs becomes -4DV and the threshold voltage decreases to -BV, so the switch can be turned off.

[0080] On the other hand, the difference with 4DV is V th When a control signal exceeding Vgs is applied, th Since the potential difference between the positive and negative terminals is larger than the potential difference between the positive and negative terminals, the switch can be turned on.

[0081] The protection element can be configured in a form in which diodes are connected in series as shown in FIG. 3a, or in a form in which diodes are connected in parallel (P3b) as shown in FIG. 3b.

[0082] Meanwhile, according to another embodiment of the present invention, the diode can be configured in a different direction as shown in FIG. 3c.

[0083] Specifically, FIG. 3c shows a configuration in which a plurality of diodes are connected in series in one direction and are connected in the reverse direction in parallel with diodes in the other direction.

[0084] Specifically, a plurality of diodes connected in series in a first direction may form a first diode group G31.

[0085] Moreover, the diodes connected in series in a second direction opposite to the first direction can form a second diode group G32.

[0086] The diodes included in the second diode group G32 may consist of one diode or may consist of multiple diodes.

[0087] The first diode group and the second diode group can be connected in parallel.

[0088] In forming a protection element in this manner, there is no limitation on the connection form of the diode, and there is no limitation on the form in which the protection element is provided with the diode other than the connection method mentioned in this specification.

[0089] 4a and 4b show that the protection elements P4a, P4b are resistors according to one embodiment.

[0090] When a current flows through the resistance element, a voltage corresponding to the flowing current is applied thereto. Therefore, when the switching converter 200 operates and a current flows, a voltage may increase at the switch source terminal by the corresponding current.

[0091] On the other hand, the protection elements P4a and P4b can be determined taking into consideration the range in which the threshold voltage of the switch is changed.

[0092] As shown in FIG. 4a, when switch 250 is irradiated with radiation and the threshold voltage is changed to −EV, the resistance of protection element P4a becomes K ohms (Ω), and when 1 A flows through protection element P4a, a voltage of KV is applied to the protection element (E and K are positive numbers, and the absolute value of E is smaller than K).

[0093] With the above-mentioned configuration, an increased voltage of KV is applied to the source terminal. When the voltage at the source terminal of the switch increases in this way, even if the control signal is input to 0V and Vgs becomes -KV and the threshold voltage is changed to -EV, the switch can be turned off.

[0094] That is, when a control signal of (KE)V or more is applied, Vgs becomes larger than -EV, and the switch can be turned on.

[0095] The protection element can be configured in a form in which resistive elements are connected in series as shown in FIG. 4a, or in a form in which they are connected in parallel (P4b) as shown in FIG. 4b.

[0096] Meanwhile, the above-mentioned embodiment of the protection element is merely one embodiment for explaining the present invention, and there is no limitation on the type and embodiment of the protection element as long as it is an element that can increase the voltage of the source terminal of the switch element.

[0097] Fig. 5a shows a connection between a feedback resistor F and a buffer capacitor C1 according to an embodiment, and Fig. 5b shows a graph illustrating the function of the buffer capacitor C1 according to an embodiment. Fig. 5a also shows that the protection element is configured in a form of a series connection of diodes (P5).

[0098] Referring to FIG. 5a, the driving control unit is connected to a feedback resistance element F and can sense the current flowing through the feedback resistance element.

[0099] Based on this, the drive control unit 300 can control the switching conversion unit.

[0100] Specifically, when a large amount of current flows through the feedback resistance element F, the driving control unit 300 transmits a control signal to turn off the switch, thereby reducing the current flowing through the feedback resistance element F.

[0101] Specifically, when the current flowing through the feedback resistance element F is small, the driving control unit 300 transmits a control signal to turn on the switch, thereby increasing the current flowing through the feedback resistance element F.

[0102] The size of the feedback resistor F can be determined arbitrarily, but can be determined so as to perform the boosting operation of the switching converter described above.

[0103] 5a and 5b, a current with a large difference in change can flow through the switch depending on whether the switch is turned on or off. In order to prevent such a sudden change G51 in the current, the switching converter may further include a buffer capacitor C1 connected in parallel with the feedback resistor F and provided between the protection element 5 and the ground.

[0104] Graph G51 of FIG. 5b is a graph showing the current flow without a snubber capacitor, and G52 is a graph showing the current flow with a snubber capacitor.

[0105] If no buffer capacitor is provided, the current flow changes abruptly at time t51 when the switch operation changes in G51. On the other hand, in the case of G52, which is provided with a buffer capacitor, the charge in the capacitor can be charged at time t52 when the switch operation changes, thereby preventing abrupt current change.

[0106] By this operation, even if the buffer capacitor is charged and the switch is turned on and off, the change in current can be reduced and the operation of the switching converter can be stabilized.

[0107] The steps of a method or algorithm described in connection with the embodiments of the present invention may be implemented directly in hardware, or in a software module executed by hardware, or in a combination thereof. The software module may be present in a Random Access Memory (RAM), Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Flash Memory, a hard disk, a removable disk, a CD-ROM, or any other form of computer readable storage medium known in the art to which the present invention pertains.

[0108] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments should be understood as illustrative in all respects and not restrictive.

Claims

1. In the power supply device, a switch including a first terminal and a second terminal for receiving an input of a control signal, the switch being operable to turn on or off by comparing a magnitude between a voltage between the first terminal and the second terminal and a threshold voltage; a protection element connected to the first terminal to change a magnitude of a source voltage of the first terminal; a switching conversion unit including the switch and the protection element, generating an output power supply using an input power supply output from an input power supply unit, and outputting the output power supply to a product load; Including, the protection element is disposed between a ground to which the product load of the switching conversion unit is connected and the first terminal, The magnitude of the source voltage of the first terminal is adjusted to be higher than when the protection element is not present.

2. A drive control unit that generates an operation control signal for the switching conversion unit; a power generation unit that supplies power to at least one of the switching conversion unit and the drive control unit; 2. The power supply device according to claim 1, further comprising:

3. The protection element is When the control signal is applied to turn on the switch, the source voltage is applied to the first terminal; 3. The power supply of claim 2, further comprising at least one of a plurality of resistor elements of a predetermined magnitude and a plurality of diodes having threshold voltages of a predetermined magnitude.

4. The switch is 4. The power supply device according to claim 3, wherein the power supply device is operated to be turned on or off by comparing a voltage difference between the first terminal and the second terminal with the threshold voltage.

5. The drive control unit is 4. The power supply device according to claim 3, wherein the control signal is determined so that a maximum value of a voltage difference between the first terminal and the second terminal, which is a voltage value for turning on the switch, exceeds the magnitude of an absolute value of the changed threshold voltage.

6. The switching conversion unit includes: The power supply device according to claim 3 , further comprising a feedback resistor connected to the drive controller and disposed between the protection element and the ground.

7. The switching conversion unit includes:

7. The power supply device according to claim 6, further comprising a buffer capacitor connected in parallel with the feedback resistor and disposed between the protection element and the ground.

8. The power supply further includes a product load that is driven by receiving the output power, The drive control unit is Based on the current flowing through the feedback resistor, 7. The power supply device according to claim 6, wherein the control signal is determined to provide the output power corresponding to the product load via the input power and an inductor.

9. The switch is a third terminal connected to the inductor; The drive control unit is 7. The power supply device of claim 6, wherein the control signal, which determines the amount of current transmitted through the third terminal, is determined based on a current flowing through the feedback resistor element independently of the change in the threshold voltage.

10. The protection element is 4. The power supply device of claim 3, wherein the first diode group includes at least one diode connected in series in a first direction, and a second diode group includes at least one diode connected in series in a second direction opposite to the first direction, and is formed by connecting the first diode group in parallel.

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