CN110050197B - Power Evaluation Equipment - Google Patents

Abstract

According to various embodiments, a power source evaluation device is provided. The power supply evaluation apparatus according to an embodiment of the present invention includes: an input terminal unit electrically connected to a power supply to be evaluated; a voltage determination unit electrically connected to the input terminal unit, for determining whether a voltage of the power supply to be evaluated satisfies a predetermined condition, and when the voltage satisfies the predetermined condition, the voltage determination unit outputs a first signal corresponding to satisfaction of the predetermined condition; a state holding unit electrically connected to the voltage determining unit, for holding a state corresponding to the first signal and outputting a second signal corresponding to the state; and a power supply holding unit electrically connected to the input terminal unit and the state holding unit, charged by the power supply to be evaluated, and supplying power to the state holding unit.

Description

Power Evaluation Equipment

technical field

The present disclosure relates to a power supply evaluation device.

Background technique

In a power supply including a battery, voltage holding performance to maintain a constant output voltage is important. In order to check the voltage holding performance, in the prior art, a measuring device such as an oscilloscope is wired to a power source such as a battery to evaluate whether a constant output voltage is maintained.

However, in such an evaluation method, the connection of the wires may be disconnected during the evaluation process and the evaluation may not be completed, or noise may be generated and thus accurate evaluation may not be performed. Furthermore, the evaluation cannot be performed quickly for a large number of power sources due to the use of common measurement equipment.

SUMMARY OF THE INVENTION

technical problem

Provides a power supply evaluation device that can more easily determine whether a power supply maintains a constant output voltage.

In addition, a power supply evaluation device that can be used for various power supplies by using a simple configuration is provided.

Furthermore, there is provided a power supply evaluation apparatus that can perform power supply evaluation without being separately supplied with power.

In addition, a power supply evaluation apparatus that can perform more accurate power supply evaluation is provided.

Technical solutions

According to an aspect of the present disclosure, a power supply evaluation apparatus includes: an input terminal unit electrically connected to a power supply to be evaluated; a voltage determination unit electrically connected to the input terminal unit and configured to determine whether a voltage of the power supply to be evaluated satisfies a predetermined condition, and when the voltage of the power supply to be evaluated satisfies the predetermined condition, the voltage determining unit outputs a first signal corresponding to satisfying the predetermined condition; the state maintaining unit is electrically connected to the voltage determining unit and is configured to maintain the same value as the first signal a corresponding state and output a second signal corresponding to the state; and a power supply holding unit electrically connected to the input terminal unit and the state holding unit and configured to be charged by the power supply to be evaluated and supply power to the state holding unit.

The predetermined condition may be that the voltage of the power supply to be evaluated is equal to or less than a preset threshold voltage, and the first signal may be a signal corresponding to satisfying the condition that the voltage of the power supply to be evaluated is equal to or less than the preset threshold voltage.

The state maintaining unit may be configured to change the state to the first state based on the first signal and maintain the first state and output a second signal corresponding to the first state, and the first state may be a voltage indicating that the power supply to be evaluated is equal to or less than a pre-set threshold voltage condition.

The state maintaining unit may be configured to maintain the second state before the first signal is input and to maintain the first state after the first signal is input, and the second state may be indicative of a voltage that satisfies the power supply to be evaluated exceeds a preset The state of the threshold voltage condition.

The power evaluation apparatus may further include a state initialization unit electrically connected to the state holding unit and the input terminal unit and configured to change the state of the state holding unit to the second state and maintain the second state based on a user's input.

The power holding unit may be configured to supply power to the state holding unit when the state holding unit is in the first state and may be charged by the power supply to be evaluated when the state holding unit is in the second state.

The power supply evaluation apparatus may further include: a state display unit electrically connected to the input terminal unit and the state holding unit and configured to display an evaluation result of the power supply to be evaluated based on the second signal.

The status display unit may include a lighting unit that blinks based on the second signal, and the lighting unit may be turned off (Off) when the status maintaining unit is in the first state, and may be turned on (On) when the status maintaining unit is in the second state.

The power source to be evaluated may be a direct current (DC) power source, and the input terminal unit may include two input terminals electrically connected to the DC power source.

The predetermined condition may be a condition that the voltage of the power supply to be evaluated is equal to or greater than a preset threshold voltage, and the first signal may be a signal corresponding to satisfying the condition that the voltage of the power supply to be evaluated is equal to or greater than the preset threshold voltage .

technical effect

According to various embodiments, a power supply evaluation apparatus may be provided that may determine whether a power supply maintains a constant output voltage.

Furthermore, it is possible to provide a power supply evaluation apparatus that can be used for various power supplies by using a simple structure.

Furthermore, it is possible to provide a power supply evaluation apparatus that can perform power supply evaluation without being separately supplied with power.

In addition, a power supply evaluation apparatus that can perform more accurate power supply evaluation can be provided.

Description of drawings

FIG. 1 shows the configuration of a power evaluation apparatus according to an embodiment.

FIG. 2 shows an example of the circuit configuration of the power supply evaluation apparatus according to the embodiment.

FIG. 3 is a diagram showing the state of each node and LED to illustrate the operation of the example circuit shown in FIG. 2 .

best practice

A power supply evaluation device includes: an input terminal unit electrically connected to a power supply to be evaluated; a voltage determination unit electrically connected to the input terminal unit and configured to determine whether the voltage of the power supply to be evaluated satisfies a predetermined condition, and when the voltage of the power supply to be evaluated When the voltage of the power supply satisfies the predetermined condition, the voltage determining unit outputs a first signal corresponding to the predetermined condition; the state maintaining unit is electrically connected to the voltage determining unit and is configured to maintain the state corresponding to the first signal and output the state corresponding to the predetermined condition. a second signal corresponding to the state; and a power supply holding unit electrically connected to the input terminal unit and the state holding unit and configured to be charged by the power supply to be evaluated and supply power to the state holding unit.

Detailed ways

These and/or other aspects will become apparent and better understood from the following description of the embodiments in conjunction with the accompanying drawings. However, the present disclosure is not limited by the embodiments set forth herein, but may be embodied in many different forms, and it should be understood that the present disclosure includes all changes, equivalents, and substitutes without departing from the spirit and technical scope of the present disclosure. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to those skilled in the art. In the description of the present disclosure, certain detailed descriptions of the prior art are omitted when it is deemed that they may unnecessarily obscure the essence of the present disclosure.

For example, the specific shapes, structures and characteristics described in this specification may be changed from one embodiment to another and implemented without departing from the spirit and scope of the present disclosure. In addition, it should be understood that the location and arrangement of individual elements within each embodiment may be changed without departing from the spirit and scope of the present disclosure. Therefore, it is to be understood that the following detailed description is not to be considered for purposes of limitation, and that the scope of the present disclosure includes the scope of the appended claims and all equivalents thereof. In the drawings, the same reference numbers refer to elements that are identical or similar in many respects. That is, the specific details described are simple examples. Particular embodiments may differ from the example details and still be considered within the spirit and scope of the present disclosure.

Although terms such as "first," "second," etc. may be used to describe various components, these components are not necessarily limited by the above terms. The above terms are only used to distinguish one component from another.

The terms used in this specification are used to describe exemplary embodiments only, and are not intended to limit the inventive concept. Expressions used in the singular include expressions in the plural unless the context clearly indicates a different meaning. In this specification, it should be understood that terms such as "including", "having" and "comprising" are intended to indicate the presence of features, numbers, steps, acts, components, parts or combinations thereof disclosed in the specification, and are not intended to exclude The possibility of one or more other features, numbers, steps, acts, components, parts or combinations thereof may exist or may be added. Although terms such as "first," "second," etc. may be used to describe various components, these components are not necessarily limited by the above terms. The above terms are only used to distinguish one component from another.

Hereinafter, the present disclosure will be described more fully with reference to the accompanying drawings, in which example embodiments of the disclosure are shown. When describing with reference to the drawings, the same reference numerals in the drawings denote the same or corresponding elements, and repeated descriptions thereof will be omitted.

FIG. 1 shows the configuration of a power evaluation device 1 according to the embodiment.

1 , the power evaluation apparatus 1 may include an input terminal unit 20 , a voltage determination unit 30 , a state holding unit 40 , a power holding unit 50 , a state display unit 60 and a state initialization unit 70 .

The input terminal unit 20 according to the embodiment may include one or more terminals 21 and 22 for electrically connecting the power supply 10 to be evaluated and the power supply evaluation apparatus 1 according to the embodiment.

In this case, the power source 10 to be evaluated may be a DC power source, and may be an AC power source.

Although it is shown in FIG. 1 that the power supply 10 to be evaluated and the power supply evaluation device 1 are connected by using two terminals 21 and 22 , this is provided as an example, and the present disclosure is not limited thereto. The number of terminals may vary depending on the type and/or standard of the power supply 10 to be evaluated.

Additionally, each of the terminals 21 and 22 may include various means that may electrically connect the power supply 10 to be evaluated and the power supply evaluation device 1 . For example, where the power source 10 to be evaluated is a battery, the terminals 21 and 22 may comprise physical contact points that can contact the battery's poles and thus be electrically connected to the battery. Furthermore, in the case where the power supply 10 to be evaluated supplies power in the form of a connector, the terminals 21 and 22 may include one of a female connector, a male connector, a harness, and a port.

However, this is provided as an example, and the present disclosure is not limited thereto. Any means can be used without limitation as long as the terminals 21 and 22 can electrically connect the power supply 10 to be evaluated and the power supply evaluation apparatus 1 .

The power supply 10 to be evaluated and the power supply evaluation apparatus 1 are electrically connected to each other through the input terminal unit 20, and evaluation of the power supply 10 to be evaluated (described in detail below) can be performed. Furthermore, since the power supply 10 to be evaluated supplies power to the power supply evaluation apparatus 1, the voltage determination unit 30, the state holding unit 40, the power supply holding unit 50, the state display unit 60, and the state initializing unit 70 are operable.

In other words, the power supply evaluation apparatus 1 according to the embodiment can be supplied with power from the power supply 10 to be evaluated, and at the same time can evaluate the power supply 10 to be evaluated. Therefore, the present disclosure can evaluate the power supply 10 to be evaluated without supplying separate power to the power supply evaluation apparatus 1 .

The voltage determination unit 30 according to the embodiment may determine whether the voltage of the power supply 10 to be evaluated satisfies the predetermined condition, and when the voltage of the power supply 10 to be evaluated satisfies the predetermined condition, the voltage determination unit 30 may output the first voltage corresponding to satisfying the predetermined condition Signal. For this purpose, the voltage determination unit 30 and the input terminal unit 20 may be electrically connected to each other. The input terminal unit 20 may be electrically connected to the power supply 10 to be evaluated.

Furthermore, the "predetermined condition" may include a condition that the voltage of the power supply 10 to be evaluated is a preset threshold voltage or less than the preset threshold voltage. The "predetermined condition" may include the condition that the voltage of the power supply 10 to be evaluated is a preset threshold voltage or greater than the preset threshold voltage, and may include that the voltage of the power supply 10 to be evaluated falls within a preset voltage range conditions of.

Hereinafter, although the description is made under the assumption that the "predetermined condition" is a condition that the voltage of the power supply 10 to be evaluated is a preset threshold voltage or less, the present disclosure is not limited thereto.

In addition, when the voltage of the power supply 10 to be evaluated satisfies the predetermined condition, the voltage determination unit 30 may output the first signal corresponding to satisfying the predetermined condition.

For example, taking a case where the “predetermined condition” is a condition that the voltage of the power supply 10 to be evaluated is a preset threshold voltage or less than the preset threshold voltage, the voltage of the power supply 10 to be evaluated is at the time point t3 The preset threshold voltage was previously exceeded, from time point t3 to time point t4 (later than time point t3 ) equal to or less than the preset threshold voltage, and from time point t4 , the preset threshold voltage is exceeded again.

In this case, from the time point t3 to the time point t4, the voltage determination unit 30 may output a first signal indicating that the condition that the voltage of the power supply 10 to be evaluated is a preset threshold voltage or less than the preset threshold voltage is satisfied. Signal. In this case, more specifically, the first signal may be 5[V] (logic 1 or high) or 0[V] (logic 0 or low). In other words, the voltage determination unit 30 may output 0(1) before time point t3, output 1 (or 0) from time point t3 to time point t4, and output 0(1) again from time point t4.

The threshold voltage, which is a reference value for determining whether a predetermined condition has been satisfied, may be set by the user. For example, when a battery of 2.5 [V] or less is to be detected relative to a battery that normally requires a voltage output of 5 [V], the threshold voltage may be set to 2.5 [V].

Also, the voltage determination unit 30 may be implemented in various ways. For example, although the voltage determination unit 30 may be implemented as an IC such as a Voltage Supervisor, this is provided as an example, and the present disclosure is not limited thereto.

The state maintaining unit 40 according to the embodiment may maintain the state corresponding to the first signal output by the voltage determining unit 30, and in this case, the state maintaining unit 40 may output the second signal corresponding to the relevant state.

In more detail, when the voltage of the power supply 10 to be evaluated satisfies the predetermined condition and the voltage determination unit 30 outputs the first signal accordingly, the state maintaining unit 40 may change the state to the first state based on the first signal and maintain the first state, so The first state is a state indicating that the voltage of the power supply 10 to be evaluated satisfies a predetermined condition. In this case, the state holding unit 40 may output a second signal corresponding to the first state.

Also, the state maintaining unit 40 may maintain the second state before the first signal is input, and may maintain the first state after the first signal is input. In this case, the second state may include a state indicating that the condition that the voltage of the power supply 10 to be evaluated exceeds a preset threshold voltage is satisfied.

Therefore, the state maintaining unit 40 maintains the second state as the base state, and can maintain the first state after the point in time when the voltage of the power supply 10 to be evaluated satisfies the predetermined condition.

For example, assuming that as described in the above example: the "predetermined condition" is the condition that the voltage of the power supply 10 to be evaluated is a preset threshold voltage or less than the preset threshold voltage, the voltage of the power supply 10 to be evaluated is at the time point t3 Exceeds the preset threshold voltage before, is equal to or less than the preset threshold voltage from time point t3 to time point t4 (later than time point t3), and exceeds the preset threshold voltage again from time point t4, the corresponding Ground, the voltage determination unit 30 outputs 0(1) before the time point t3, outputs 1 (or 0) from the time point t3 to the time point t4, and outputs 0(1) again from the time point t4.

In this case, the state maintaining unit 40 may maintain the second state before the time point t3 and maintain the first state after the time point t3. Therefore, if the state of the state maintaining unit 40 becomes the first state due to the initial first signal, the state maintaining unit 40 may maintain the first state regardless of whether the voltage of the power supply 10 to be evaluated satisfies the predetermined condition.

Furthermore, in an embodiment, the "state" may be 5[V] (logic 1 or high) or 0[V] (logic 0 or low) in particular. In addition, the "hold" state may indicate that the state holding unit 40 maintains a state of 5 [V] (logic 1 or high) or 0 [V] (logic 0 or low).

The state holding unit 40 may be implemented by various memory devices. For example, the state holding unit 40 may be implemented by a storage device such as a flip-flop, a latch, or a memory. However, these are provided as examples, and the present disclosure is not limited thereto.

The power supply holding unit 50 may supply power to the state holding unit 40 when the state holding unit 40 is in the first state, and may be charged by the power supply 10 to be evaluated when the state holding unit 40 is in the second state.

For example, as in the above example, in such a case (the "predetermined condition" is that the voltage of the power supply 10 to be evaluated is a preset threshold voltage or less than the preset threshold voltage, the voltage of the power supply 10 to be evaluated at the point in time Exceeds the preset threshold voltage before t3, is equal to or less than the preset threshold voltage from the time point t3 to the time point t4, and exceeds the preset threshold voltage again from the time point t4), due to the power evaluation device 1 The power supply from the power supply 10 to be evaluated is supplied, so the power supply evaluation apparatus 1 may not be supplied with power from the time point t3 to the time point t4.

In this case, the power supply holding unit 50 may be charged by the power supply 10 to be evaluated before the time point t3, the state holding unit 40 may be supplied with power from the time point t3 to the time point t4, and may be supplied by the power supply after the time point t4. The power supply 10 to be evaluated is charged again.

Therefore, the power supply holding unit 50 can hold the state holding unit 40 in the current state (specifically, the first state indicating that the voltage of the power supply 10 to be evaluated satisfies a predetermined condition) without error.

In addition, the power holding unit 50 may be implemented by various energy storage devices. For example, the power holding unit 50 may be implemented by a device that can temporarily store and release electrical energy, such as one or more capacitors, one or more inductors, or a battery. However, these are provided as examples, and the present disclosure is not limited thereto.

The state initializing unit 70 according to the embodiment may change the state of the state maintaining unit 40 from the first state to the second state and maintain the state maintaining unit 40 in the second state based on the user's input.

As described above, if the state of the state holding unit 40 has changed to the first state due to the initial first signal, since the state holding unit 40 maintains the first state regardless of whether the voltage of the power supply 10 to be evaluated satisfies the predetermined condition, the The state of the state holding unit 40 should be initialized to the second state in order to reuse the power evaluation device 1 .

The state initialization unit 70 may change the state of the state maintaining unit 40 to a second state (indicating that the voltage of the power supply 10 to be evaluated satisfies a predetermined condition) and maintain the second state by applying an input to the state maintaining unit 40 .

The input applied by the state initialization unit 70 to the state holding unit 40 to cause the state holding unit 40 to become the second state may vary according to the implementation method of the state holding unit 40 . For example, where the state holding unit 40 includes a flip-flop with an initialization port CLR, the holding unit 40 may be brought to the second state by applying 5[V] (logic 1 or high) to the relevant port.

Also, although the state initialization unit 70 may include a device that receives a user's input, such as a switch, this is provided as an example, and the present disclosure is not limited thereto.

The state display unit 60 may display the evaluation result of the power supply 10 to be evaluated based on the second signal of the state holding unit 40 .

In more detail, the status display unit 60 may include a lighting unit that blinks based on the second signal. In this case, the lighting unit may be turned off when the state maintaining unit 40 is in the first state, and may be turned on when the state maintaining unit 40 is in the second state.

In other words, the status display unit 60 turns the lighting unit on before the voltage of the power supply 10 to be evaluated satisfies the predetermined condition, and turns off the lighting unit after the voltage of the power supply 10 to be evaluated satisfies the predetermined condition, thereby allowing the user to recognize more intuitively Whether the power supply 10 to be evaluated is normal.

However, this is provided as an example, the lighting unit may be turned on when the state maintaining unit 40 is in the first state and turned off when the state maintaining unit 40 is in the second state.

Therefore, the present disclosure can more intuitively identify whether the voltage of the power supply 10 to be evaluated satisfies a predetermined condition.

FIG. 2 is an example of a circuit configuration of the power supply evaluation apparatus according to the embodiment.

2 , the power evaluation apparatus 1A may include input terminals 21A and 22A, a voltage determination unit 30A, a state holding unit 40A, a power holding unit 50A, a state display unit 60A, and a state initialization unit 70A.

The power supply 10A to be evaluated may include a DC power supply. The power supply to be evaluated 10A and the input terminals 21A and 22A may be electrically connected to each other for evaluating the power supply to be evaluated 10A.

The voltage determination unit 30A may be electrically connected to the input terminals 21A and 22A, and may determine whether the voltage of the power supply 10A to be evaluated satisfies a predetermined condition, and when the voltage of the power supply 10A to be evaluated satisfies the predetermined condition, the voltage determination unit 30A may output the The first signal corresponding to the predetermined condition is satisfied. In this case, more specifically, the first signal may include 5[V] (logic 1 or high) or 0[V] (logic 0 or low).

Furthermore, as shown, the voltage determination unit 30A may be implemented as an IC such as a voltage monitor.

The state holding unit 40A may hold the state corresponding to the first signal output by the voltage determining unit 30A, and in this case, the state holding unit 40A may output the second signal corresponding to the relevant state. The state maintaining unit 40A may maintain the second state before the first signal is input, and may maintain the first state after the first signal is input. In this case, the second state may include a state indicating that a condition that the voltage of the power supply 10A to be evaluated exceeds a preset threshold voltage is satisfied. Therefore, the state maintaining unit 40A maintains the second state as the base state, and can maintain the first state after the point in time when the voltage of the power supply 10A to be evaluated satisfies the predetermined condition.

Furthermore, as shown, the state holding unit 40A may be implemented as a D flip-flop.

The power supply holding unit 50A may supply power to the state holding unit 40A when the state holding unit 40A is in the first state, and may be charged by the power supply 10A to be evaluated when the state holding unit 40A is in the second state.

The power supply holding unit 50A may hold the state holding unit 40A in the current state (specifically, a first state indicating that the voltage of the power supply 10A to be evaluated satisfies a predetermined condition).

The power holding unit 50A may be implemented by using an energy storage device such as a capacitor 52A and a diode 51A for preventing reverse current.

The state initializing unit 70A may change the state of the state maintaining unit 40A from the first state to the second state and maintain the state maintaining unit 40A in the second state based on the user's input.

As described above, if the state of the state holding unit 40A has become the first state due to the initial first signal, since the state holding unit 40A maintains the first state regardless of whether the voltage of the power supply 10A to be evaluated satisfies the predetermined condition, the The state of the state holding unit 40A should be initialized to the second state to reuse the power evaluation device 1A.

Therefore, the state initialization unit 70A can change the state of the state maintaining unit 40A to the second state (indicating that the voltage of the power supply 10A to be evaluated satisfies the predetermined condition) and maintain the second state by applying an input to the state maintaining unit 40A.

Furthermore, the input applied by the state initialization unit 70A to the state holding unit 40A to cause the state holding unit 40A to become the second state may differ according to the implementation method of the state holding unit 40A. For example, in the case where the state holding unit 40A includes a flip-flop with an initialization port n5 as in this example, the state holding unit 40A can be made to become second state.

Furthermore, although the state initialization unit 70A may include a device that receives a user's input, such as a switch, this is provided as an example, and the present disclosure is not limited thereto.

The state display unit 60A may display the evaluation result of the power supply 10A to be evaluated based on the second signal of the state holding unit 40A.

In more detail, the status display unit 60A may include an LED 61A that blinks based on the second signal. In this case, the lighting unit may be turned off when the state maintaining unit 40A is in the first state, and may be turned on when the state maintaining unit 40A is in the second state.

In other words, the status display unit 60A turns on the lighting unit before the voltage of the power supply 10A to be evaluated satisfies the predetermined condition, and turns the lighting unit off after the voltage of the power supply 10A to be evaluated satisfies the predetermined condition, thereby allowing the user to recognize more intuitively Whether the power supply 10A to be evaluated is normal.

For the blinking of the LED 61A, the status display unit 60A may include an electronic switch 62A in addition to the LED 61A.

FIG. 3 is a view showing the state of each of the nodes n1 to n5 and LEDs to explain the operation of the example circuit shown in FIG. 2 .

3, it is assumed that the voltage of the power supply 10A to be evaluated drops during the period from the time point t1 to the time point t2 and from the time point t3 to the time point t4, and the voltage during the period from the time point t3 to the time point t4 is a threshold value voltage or less than the threshold voltage.

First referring to the voltage at node n2, the voltage determination unit 30A may output a first signal indicating that the condition that the voltage of the power supply 10A to be evaluated is a threshold voltage or less than the threshold voltage is satisfied. In this case, as described above, the first signal may be 5[V] (logic 1 or high). In other words, the voltage determination unit 30A may output 0 before the time point t3, output 1 from the time point t3 to the time point t4, and output 0 again from the time point t4.

Referring to the voltage at node n3, although the voltage of the power supply 10A to be evaluated changes (see the voltage at node n1), the power supply holding unit 50A can maintain a constant voltage.

Then, referring to the voltage at the node n4 and the state of the LED 61A, the state holding unit 40A starts to output the first signal (see the voltage at the node n4) from when the voltage drops at the time point t3, and the LED 61A is turned off to show that the waiting The voltage of the power supply 10A to be evaluated is a preset threshold voltage or less than the threshold voltage, wherein the first signal indicates that the voltage of the power supply 10A to be evaluated is a preset threshold voltage or less than the threshold voltage voltage conditions.

However, it is revealed that in the case where the state of the state holding unit 40A becomes the second state with reference to the voltage at the node n5, the voltage at the node n4 and the state of the LED 61A are initialized again.

So far, the preferred embodiment has been mainly described. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the essential characteristics of the present disclosure. The exemplary embodiments should be considered in a descriptive sense only and not for purposes of limitation. Therefore, the scope of the present disclosure is defined not by the detailed description of the present disclosure but by the appended claims, and all differences within the scope of the present disclosure will be construed as being included in the present disclosure.

Claims (9)

1. A power supply evaluation device for evaluating whether the power supply is normal, including: an input terminal unit for electrical connection with the power supply to be evaluated; a voltage determination unit, electrically connected to the input terminal unit, and configured to determine whether the voltage of the power supply to be evaluated satisfies a predetermined condition, and when the voltage satisfies the predetermined condition, output a voltage that satisfies the predetermined condition the corresponding first signal; a state holding unit electrically connected to the voltage determination unit and configured to change a state to a first state corresponding to the first signal based on the first signal received from the voltage determination unit and to output a state corresponding to the first signal the second signal corresponding to the first state; a power supply holding unit, electrically connected to the input terminal unit and the state holding unit, and configured to be charged by the power supply to be evaluated through the input terminal unit and to supply power to the state holding unit, wherein, the power holding unit includes a capacitor or an inductor; and A state display unit is electrically connected to the input terminal unit and the state holding unit, and is configured to display an evaluation result of the power supply to be evaluated based on the second signal received from the state holding unit. 2. The power supply evaluation apparatus according to claim 1, wherein the predetermined condition is a condition that the voltage of the power supply to be evaluated is equal to or less than a preset threshold voltage, and The first signal is a signal corresponding to satisfying a condition that the voltage is equal to or smaller than the preset threshold voltage. 3. The power evaluation apparatus according to claim 2, wherein the first state is a state indicating that a condition that the voltage is equal to or smaller than the threshold voltage set in advance is satisfied. 4. The power supply evaluation device according to claim 3, wherein the state maintaining unit is configured to maintain the second state before the first signal is input and to maintain the first state after the first signal is input. a state, and The second state is a state in which the condition that the voltage exceeds the preset threshold voltage is satisfied. 5. The power supply evaluation device of claim 4, further comprising: a state initializing unit electrically connected to the state maintaining unit and the input terminal unit and configured to change the state of the state maintaining unit to the second state and maintain the second state based on a user's input . 6 . The power supply evaluation apparatus according to claim 4 , wherein the power supply holding unit is configured to supply power to the state holding unit when the state holding unit is in the first state and to supply power to the state holding unit when the state holding unit is in the first state. 7 . The unit is charged by the power source to be evaluated while in the second state. 7. The power supply evaluation device of claim 4, wherein the status display unit includes a lighting unit that blinks based on the second signal, and The lighting unit is turned off (Off) when the state maintaining unit is in the first state, and turned on (On) when the state maintaining unit is in the second state. 8. The power supply evaluation apparatus of claim 1, wherein the power supply to be evaluated is a direct current (DC) power supply, and The input terminal unit includes two input terminals electrically connected to the DC power supply. 9. The power supply evaluation apparatus according to claim 1, wherein the predetermined condition is a condition that the voltage of the power supply to be evaluated is equal to or greater than a preset threshold voltage, and The first signal is a signal corresponding to satisfying a condition that the voltage is equal to or greater than the preset threshold voltage.

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