Portable power bank and charging method thereof

Abstract

The present invention relates to a portable power bank that is capable of reducing charging time and has a sleek appearance by exposing only a single charging connector to the outside while supporting diversified charging power sources, the power bank comprising: a power determination unit; a power conversion unit; a control unit; and a battery unit, wherein the power determination unit includes a first determination unit that determines alternating current / direct current and a second determination unit that determines the voltage of direct current power, the power conversion unit includes a commercial power conversion means, a solar power conversion means, and a cigarette lighter power conversion means, and a power input connector of the power bank is configured as a single connector.

Description

Portable power bank and its charging method

[0001] The present invention relates to a portable power bank capable of charging using various power sources and a charging method thereof, and more particularly, to a portable power bank capable of being carried and moved, and of being charged and then used using power sources that can be supplied regardless of location, by selectively converting solar power, vehicle cigarette lighter power, and commercial power, and a charging method thereof.

[0002] An energy storage system (ESS) is a storage device that stores energy in a battery so that it can be used at any time. Until now, there was a difference between production and storage of electric energy, so production had to move together when using electric energy, but ESS can effectively store and use energy, allowing for leeway in energy production.

[0003] For this reason, although the leisure market, such as camping using ESS, has been expanding recently, there is a lack of ESS products that can meet the various requirements for leisure and camping due to environmental changes.

[0004] For example, camping ESSs are meant to be carried outdoors, but their limited charging power makes them inconvenient to use. Furthermore, larger capacities often lead to heavier and larger devices, and their short lifespans.

[0005] To solve this problem, devices that can charge using renewable energy power such as solar power or the vehicle's cigarette lighter jack power are being developed. However, these devices have the problem of an unattractive appearance and a very long charging time because the ESS connector port must be configured differently depending on the charging power source.

[0006] (Patent Document 0001) Patent Registration No. 10-1270798 (June 5, 2013)

[0007] (Patent Document 0002) Patent Publication No. 10-2014-0009776 (January 23, 2014)

[0008] The present invention provides a portable power bank that has an attractive appearance and can shorten the charging time by diversifying the charging power source and exposing only one charging connector to the outside, taking into consideration the above problems.

[0009] The problems to be solved by the present invention are not limited to the problems described above, and problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention pertains from this specification and the attached drawings.

[0010] A mobile power bank according to one embodiment of the present invention comprises a power judgment unit, a power conversion unit, a control unit, and a battery unit, wherein the power judgment unit comprises an AC / DC judgment unit and a DC voltage judgment unit, the power conversion unit comprises a commercial power conversion means, a solar power conversion means, and a cigarette lighter power conversion means, and the power bank comprises one power input connector.

[0011] In addition, a mobile power bank according to one embodiment of the present invention is configured such that a commercial power conversion means includes first and second pre-charge circuits, and a solar power conversion means includes a converter and a power measuring means.

[0012] In addition, a mobile power bank according to one embodiment of the present invention is configured such that a converter of a solar power conversion means includes first, second, and third diodes, first and second capacitors, and an inductor, and a power measuring means includes a detection circuit for measuring voltage and current of input solar power and a converter current detection circuit for measuring output current of the converter.

[0013]

[0014] In addition, according to one embodiment of the present invention, a mobile power bank is configured to charge a mobile power bank, including the steps of: determining whether power input from a connector port is AC power or DC power; (a) if the power is AC power, switching power with a commercial power conversion means; converting the switched power to charge a battery; (b) if the power is DC power, determining whether the voltage is 18 V or higher; (b-1) if the voltage is 18 V or higher, switching power with a solar power conversion means; converting the switched power to charge the battery; (b-2) if the voltage is less than 18 V, switching power with a cigarette lighter power conversion means; converting the switched power to charge the battery; and (c) if the voltage rises to 18 V or higher in step (b-2), re-switching power with a solar power conversion means; converting the switched power to charge the battery.

[0015] In addition, a mobile power bank according to one embodiment of the present invention is configured to charge a mobile power bank by including a step of charging a battery unit with a first constant current when charging using commercial power, a step of charging the battery unit with a first constant voltage when the output voltage of the power conversion means reaches a first constant voltage during charging, a step of charging the battery unit with a second constant current when the output current of the power conversion means reaches a second constant current, and a step of charging the battery unit with a second constant voltage when the output voltage of the power conversion means reaches a second constant voltage.

[0016] In addition, a mobile power bank according to one embodiment of the present invention is configured to charge the mobile power bank by including a step of a control unit comparing the output power of a solar power conversion means with a set power when charging using solar power, (b-1-1) a step of stopping a PWM switching operation of a converter when the output power is less than the set power, a step of directly connecting the input solar power to the battery unit and charging the battery unit, (b-1-2) a step of activating the PWM switching operation of the converter when the output power is equal to or greater than the set power, and a step of converting the input solar power into a charging voltage of the battery unit and charging the battery unit.

[0017] The portable power bank of the present invention has an attractive appearance and can shorten the charging time by diversifying the charging power while only exposing one charging connector on the outside.

[0018] FIG. 1 is a block diagram showing a power bank according to an embodiment of the present invention.

[0019] Figure 2 is a block diagram of a commercial power conversion means of the present invention.

[0020] Figure 3 is a voltage and current waveform diagram of a battery section charged by a commercial power conversion means of the present invention.

[0021] Figure 4 is a circuit diagram of the solar power conversion means of the present invention.

[0022] Figure 5 is a charging control algorithm when the solar power conversion means of the present invention is used.

[0023] The above-described object of the present invention can be achieved by configuring a power bank having a single power input connector, including a power judgment unit, a power conversion unit, a control unit, and a battery unit, wherein the power judgment unit includes an AC / DC judgment unit and a DC voltage judgment unit, and the power conversion unit includes a commercial power conversion means, a solar power conversion means, and a cigarette lighter power conversion means.

[0024]

[0025] Hereinafter, preferred embodiments for achieving the purpose of the present invention will be described with reference to the attached drawings.

[0026] However, the present invention may be implemented in various different forms and is therefore not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description have been omitted, and similar parts have been designated with similar reference numerals throughout the specification.

[0027] Throughout the specification, when a part is said to be "connected (connected, contacted, coupled)" to another part, this includes not only cases where it is "directly connected" but also cases where it is "indirectly connected" with another member in between. In addition, when a part is said to "include" a certain component, this does not mean that other components are excluded, unless specifically stated to the contrary, but rather that other components may be included. The terminology used in this specification is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, it should be understood that terms such as "include" or "have" specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0028]

[0029] FIG. 1 is a block diagram showing a power bank according to an embodiment of the present invention, FIG. 2 is a block diagram of a commercial power conversion means of the present invention, FIG. 3 is a voltage and current waveform diagram of a battery section charged by a commercial power conversion means of the present invention, FIG. 4 is a circuit diagram of a solar power conversion means of the present invention, and FIG. 5 is a charging control algorithm when the solar power conversion means of the present invention is used.

[0030]

[0031] Referring to FIG. 1, the mobile power bank (100) of the present invention is configured to include a power input connector (110), a power judgment unit (150), a power conversion unit (200), a control unit (120), and a battery unit (130).

[0032] The power input connector (110) of the present invention can receive a power source (140) having at least one voltage magnitude range among a plurality of voltage magnitude ranges. The power source (140) may be a first power source having a first voltage magnitude range, a second power source having a second voltage magnitude range, and a third power source having a third voltage magnitude range.

[0033] In an embodiment of the present invention, for example, the first power source may be power supplied from a commercial power source (141), the second power source may be power supplied from solar power, and the third power source may be power supplied from a car cigarette lighter.

[0034] The above power judgment unit (150) is configured to include a first judgment unit (151) that judges whether the power input through the power input connector (110) of the portable power bank (100) is alternating current (AC) or direct current (DC), and a second judgment unit (152) that judges whether the voltage of the power judged to be direct current is above a predetermined value.

[0035] The portable power bank (100) of the present invention has one power input connector (110), and as described above, inputtable power may include not only commercial power (141), but also power (142) obtained from solar energy and power (143) input from a car's cigarette lighter. Therefore, it is necessary to vary the charging method for the battery unit (130) depending on the input power (140). Accordingly, the present invention includes a power determining unit (150) that determines the input power (140) so that an appropriate charging method can be applied depending on the input power (140).

[0036] The first judgment unit (151) above diagnoses that the input power is AC, and switches the input power circuit with the commercial power conversion means (300). If the power input to the first judgment unit (151) is DC, it diagnoses that it is power obtained from solar energy or power input from the cigarette lighter of a car, and switches the circuit with the second judgment unit (152).

[0037] The second judgment unit (152) determines whether the input DC power is a predetermined voltage, i.e., 18 V or higher, and if the voltage is 18 V or higher, it determines that it is power obtained from solar power and switches the input power circuit to the solar power conversion means (400). If the voltage is 18 V or lower, it temporarily determines that it is power input from a cigarette lighter and switches the input power circuit to the cigarette lighter power conversion means (500).

[0038] After that, the second judgment unit (152) continuously monitors the input power, and when the voltage increases to 18 V or more, the input power, which was temporarily diagnosed as power input from the cigarette lighter, is re-diagnosed as power obtained from solar power, and the input power circuit is re-switched to the solar power conversion means (400).

[0039]

[0040] Meanwhile, the power conversion unit (200) may include a commercial power conversion means (300) that converts AC power to be suitable for charging a battery, a solar power conversion means (400) that converts power obtained from solar power to be suitable for charging a battery, and a cigar jack power conversion means (500) that converts power input from a cigar jack.

[0041] The above commercial power conversion means (300) may include a pre-charge circuit (310) that applies a constant current and a constant voltage to the battery unit (130), a voltage detection circuit that measures the voltage applied to the battery unit (130), and a current detection circuit that measures the current applied to the battery unit (130). The pre-charge circuit (310) may include a first pre-charge circuit (311) that outputs a first constant current and a first constant voltage in a first charging section, and a second pre-charge circuit (312) that outputs a second constant current and a second constant voltage in a second charging section.

[0042] The above solar power conversion means (400) includes a converter and a power measuring means, and the converter includes first, second, and third diodes (411, 412, 413), first and second capacitors (481, 482), and an inductor (490), and the power measuring means may include a detection circuit that measures the voltage and current of the input solar power (142) and a converter current detection circuit (440) that measures the output current of the converter.

[0043] Meanwhile, the control unit (120) can control the commercial power conversion means (300), solar power conversion means (400), and cigar jack power conversion means (500), as well as the first judgment unit (151) and the second judgment unit (152), thereby controlling the charging process of the power bank (100) of the present invention.

[0044] When power is input to the commercial power conversion means (300), the above control unit (120) controls the timing of the constant current charging method and the constant voltage charging method of the pre-charge circuit (310) of the commercial power conversion means (300), thereby dividing the pre-charge circuit (310) of the commercial power conversion means (300) into a plurality of charging sections including a constant current charging section and a constant voltage charging section and driving the same.

[0045] In addition, when power is input to the solar power conversion means (400), the control unit (120) determines whether the power supplied from the solar power supply means is low power or high power, and if it is low power, stops the PWM switching operation so that the solar power supply means and the battery unit (130) are directly connected, and if it is high power, controls the solar power conversion means (400) in a PWM driving mode that applies a PWM control signal to the converter so that the voltage of the power supplied from the solar power supply means is converted into the charging voltage of the battery unit (130).

[0046] In addition, the control unit (120) can control the power input to the cigar jack power conversion means (500) so that the battery unit (130) can be charged.

[0047]

[0048] Referring to FIGS. 2 and 3, the commercial power conversion means and the charging method using the same will be described.

[0049]

[0050] Fig. 2 is a block diagram of a commercial power conversion means of the present invention, and Fig. 3 is a voltage and current waveform diagram of a battery section charged by the commercial power conversion means of the present invention.

[0051] Referring to FIGS. 2 and 3, the commercial power conversion means (300) of the present invention includes a pre-charge circuit (310) that applies a constant current and a constant voltage to the battery unit (130), a voltage detection circuit that measures the voltage applied to the battery unit (130), and a current detection circuit that measures the current applied to the battery unit (130).

[0052] The above battery unit (130) can be charged by the commercial power conversion means (300). The battery unit (130) may be a lithium-based battery. The battery unit (130) may be a lithium-ion battery or a lithium polymer battery.

[0053] The above commercial power (141) supplies power to the control unit (120) and the pre-charge circuit (310).

[0054] The pre-charge circuit (310) can supply current and voltage to the battery unit (130) in response to a control signal of the control unit (120). The pre-charge circuit (310) can supply a constant current or a constant voltage to the battery unit (130) in response to the control signal of the control unit (120). The pre-charge circuit (310) can supply a first constant current (I1), a first constant voltage (V1), a second constant current (I2), and a second constant voltage (V2) to the battery unit (130). The pre-charge circuit (310) can sequentially output the first constant current (I1), the first constant voltage (V1), the second constant current (I2), and the second constant voltage (V2).

[0055] The above precharge circuit (310) may include a first precharge circuit (311) and a second precharge circuit (312). The first precharge circuit (311) may output a first constant current (I1) and a first constant voltage (V1), and the second precharge circuit (312) may output a second constant current (I2) and a second constant voltage (V2).

[0056] A resistor (R) may be connected between the control unit (120) and the pre-charge circuit (310). The current detection circuit may be connected in parallel with the resistor (R). The current detection circuit may be connected in parallel with the resistor (R) to measure the current output from the pre-charge circuit (310). The current detection circuit may measure the output current of the pre-charge circuit (310) and supply it to the control unit (120).

[0057] The voltage detection circuit can be connected in parallel with the battery to measure the voltage applied to the battery unit (130). The voltage detection circuit can measure the voltage applied to the battery unit (130) from the precharge circuit (310) and supply it to the control unit (120).

[0058] The control unit (120) can control the precharge circuit (310) through the current value received from the current detection circuit and the voltage value received from the voltage detection circuit. In other words, the control unit (120) can control the precharge circuit (310) through the current value and voltage value applied to the battery unit (130). The control unit (120) can change the charging method of the battery by comparing the current value and voltage value applied to the battery unit (130) with preset values.

[0059] When the battery unit (130) is connected to the commercial power conversion means (300), the control unit (120) transmits a charging start signal to the pre-charge circuit (310), and the pre-charge circuit (310) can output a first constant current (I1) to the battery unit (130) in response thereto. The battery unit (130) is charged by the first constant current (I1), and accordingly, the voltage output to the battery unit (130) also increases. The section in which the battery unit (130) is charged by the first constant current (I1) can be defined as a first constant current charging section (CC1).

[0060] The above output voltage is measured by the voltage detection circuit and transmitted to the control unit (120). When the output voltage reaches the first constant voltage (V1), the control unit (120) can transmit a first constant voltage charging signal to the pre-charge circuit (310).

[0061] The above pre-charge circuit (310) can output a first constant voltage (V1) to the battery unit (130) instead of the first constant current (I1) in response to the first constant voltage charging signal.

[0062] The battery unit (130) is charged by the first constant voltage (V1), and the current applied to the battery unit (130) is reduced by supplying a constant voltage. The section in which the battery unit (130) is charged by the first constant voltage (V1) can be defined as a first constant voltage charging section (CV1).

[0063] The first constant current charging section (CC1) and the first constant voltage charging section (CV1) can be defined as a first charging section (CCCV1). The first constant current charging section (CC1) can supply more energy to the battery unit (130) than the first constant voltage charging section (CV1).

[0064] The above first pre-charge circuit (311) can output a first constant current (I1) and a first constant voltage (V1) during the first charging period (CCCV1).

[0065] The output current output to the battery unit (130) may be measured by the current detection circuit and transmitted to the control unit (120). When the output current reaches the second constant current (I2), the control unit (120) may transmit a second constant current charging signal to the pre-charge circuit (310). The pre-charge circuit (310) may output the second constant current (I2) to the battery unit (130) instead of the first constant voltage (V1) in response to the second constant current charging signal.

[0066] The battery unit (130) is charged by the second constant current (I2), and the voltage applied to the battery unit (130) increases by supplying a constant current. The section in which the battery unit (130) is charged by the second constant current (I2) can be defined as a second constant current charging section (CC2).

[0067] The control unit (120) can generate a second constant voltage charging signal and output it to the pre-charge circuit (310) when the voltage applied to the battery unit (130) reaches a second constant voltage (V2). The control unit (120) can compare the output voltage measured by the voltage detection circuit with a preset second constant voltage (V2), and generate a second constant voltage charging signal and transmit it to the pre-charge circuit (310) when the output voltage reaches the second constant voltage (V2). The pre-charge circuit (310) can output the second constant voltage (V2) to the battery unit (130) in response to the second constant voltage charging signal.

[0068] The battery unit (130) is charged by the second constant voltage (V2), and the current supplied to the battery unit (130) is reduced by supplying a constant voltage. The section in which the battery unit (130) is charged by the second constant voltage (V2) can be defined as a second constant voltage charging section (CV2).

[0069] The second constant voltage (V2) may be the maximum voltage of the battery unit (130). In other words, if a voltage higher than the second constant voltage (V2) is supplied to the battery unit (130), the battery cells of the battery unit (130) may be damaged.

[0070] The second constant current charging section (CC2) and the second constant voltage charging section (CV2) can be defined as a second charging section (CCCV2). The second constant current charging section (CC2) can supply more energy to the battery unit (130) than the second constant voltage charging section (CV2).

[0071] The charging circuit can supply greater energy to the battery unit (130) in the first and second constant current charging sections (CC1, CC2) than in the first constant voltage charging section (CV1, CV2). In other words, the charging time of the battery unit (130) can be shortened as the first and second constant current charging sections (CC1, CC2) increase.

[0072] Since the battery unit (130) is damaged when a voltage higher than the second constant voltage (V2) is supplied, a constant voltage is supplied through the first constant voltage charging section (CV1) after the first constant current charging section (CC1) to attenuate the current applied to the battery unit (130) by a certain amount, thereby delaying the time taken to reach the second constant voltage (V2) in the second constant current charging section (CC2). This allows the first and second constant current charging sections (CC1, CC2) to be extended, thereby having the effect of shortening the charging time of the battery unit (130).

[0073] Accordingly, a mobile power bank (100) that uses a conventional power conversion means can reduce the charging time of the battery unit (130) by dividing the charging section into a first charging section (CCCV1) and a second charging section (CCCV2) in a constant voltage-constant current charging method.

[0074]

[0075] Referring to FIGS. 4 and 5, the solar power conversion means and the charging method using the same will be described.

[0076]

[0077] Figure 4 is a circuit diagram of the solar power conversion means of the present invention.

[0078] Referring to FIG. 4, the solar power conversion means (400) of the present invention includes a converter and a power measuring means, and the converter includes first, second, and third diodes (411, 412, 413), first and second capacitors (481, 482), and an inductor (490), and the power measuring means includes a detection circuit (430, 420) that measures the voltage and current of the input solar power (142) and a converter current detection circuit (440) that measures the output current of the converter.

[0079] The above converter performs a switching operation according to a PWM control signal to convert and output the amount of power supplied from a solar power supply means.

[0080] Here, the converter may be configured to include a first diode (411), a first capacitor (481), a first switch (471), a second diode (412), a second switch (472), a third diode (413), an inductor (490), and a second capacitor (482), as shown in FIG. 4.

[0081] Accordingly, the converter operates the first switch (471) and the second switch (472) according to the PWM control signal output from the control unit (120) to perform switching, thereby allowing charging and discharging to occur through the first capacitor (481), the inductor (490), and the second capacitor (482), and by allowing freewheeling current to flow through the second diode (412) and the third diode (413), the voltage input from the solar power supply means can be converted into a charging voltage of the battery unit (130) and output.

[0082] The battery section (130) is charged by receiving power output from the converter.

[0083] The power measuring means measures the voltage and current of the power supplied from the solar power supply means and provides it to the control unit (120).

[0084] Here, the power measuring means can measure voltage and current from at least one of an input voltage detection circuit (430) that measures the voltage of power supplied from a solar power supply means, an input current detection circuit (420) that measures the current of power supplied from a solar power supply means, and a converter current detection circuit (440) that measures the output current of a converter.

[0085] The control unit (120) can determine the charging mode according to the measured power input from the power measuring means and adjust the PWM control signal of the converter.

[0086] Here, the control unit (120) can output a PWM control signal to the converter so that the first switch (471) is turned on and the second switch (472) is turned off so that the solar power supply means and the battery unit (130) are directly connected by comparing the measured power received from the power measuring means with the set power and, if the measured power is less than the set power, the PWM switching operation is stopped.

[0087] Here, the set power is a reference power for changing the charging mode, and can be set to a power that has a low possibility of malfunction when charging by converting the power input from the solar power supply means into the PWM switching operation of the converter when the amount of sunlight is sufficient.

[0088] In the case where the amount of sunlight is insufficient and the power is low as above, charging is performed in SDCM mode (Solar Direct Connection Mode) in which the solar power supply means and the battery unit (130) are directly connected and charged, and in the case where the amount of sunlight is sufficient and the power is high, charging is performed through constant current control, constant voltage control, and MPPT (Maximum Power Point Tracking) control through PWM driving mode.

[0089] As described above, by using the solar power conversion means (400) of the present invention, based on the amount of power input from the solar power supply means, in a low power state, the solar power supply means and the battery are charged in SDCM mode in which they are directly connected, and in a high power state, the battery is charged in PWM driving mode, thereby reducing the possibility of malfunction in a low power state where the amount of sunlight is insufficient, reducing switching loss due to PWM driving and stress on the power element, thereby increasing the charging efficiency and improving the durability of the power element.

[0090]

[0091] Figure 5 is a charging control algorithm when a solar power conversion means according to one embodiment of the present invention is used.

[0092] As illustrated in FIG. 5, in a charging method using a solar power conversion means (400) according to one embodiment of the present invention, first, a power measuring means measures solar power (142) supplied from a solar power supply means and provides it to a control unit (120) (S10).

[0093] The control unit (120), which receives the measured power of solar power (142) provided by the power measuring means in the above step S10, compares the input measured power with the set power (S20).

[0094] Here, the set power is a reference power for changing the charging mode, and can be set to a power that has a low possibility of malfunction when charging by converting the power supplied from the solar power supply means into the PWM switching operation of the converter when the amount of sunlight is sufficient.

[0095] In step S20, if the measured power is less than the set power by comparing the measured power with the set power, the control unit (120) can charge the battery unit (130) in SDCM mode by applying a PWM control signal to the converter so that the solar power supply means and the battery unit (130) are directly connected by stopping the PWM switching operation of the converter (S30).

[0096] As above, when the amount of sunlight is insufficient and the power supplied from the solar power supply means is low, the control unit (120) can output a PWM control signal to the converter so that the first switch (472) is turned on and the second switch (472) is turned off by stopping the PWM switching operation so that the solar power supply means and the battery unit (130) are directly connected through the SDCM mode.

[0097] On the other hand, if the measured power is greater than the set power by comparing the measured power and the set power input at step S20, the control unit (120) can charge the battery unit (130) in a PWM driving mode by applying a PWM control signal to the converter so that the voltage of the power supplied from the solar power supply means is converted into the charging voltage of the battery unit (130) through the PWM switching operation of the converter (S40).

[0098] As above, when the amount of sunlight is sufficient and the power supplied from the solar power supply means is high power, the control unit (120) enables charging through constant current control, constant voltage control, and MPPT control through PWM driving mode.

[0099] As described above, according to the charging method using the solar power conversion means (400) according to the embodiment of the present invention, in a low power state based on the amount of power supplied from the solar power supply means, charging is performed in SDCM mode that directly connects the solar power supply means and the battery, and in a high power state, charging is performed in PWM driving mode, thereby reducing the possibility of malfunction in a low power state where the amount of sunlight is insufficient, reducing switching loss due to PWM driving and stress on the power element, thereby increasing the charging efficiency and improving the durability of the power element.

[0100]

[0101] Meanwhile, the cigar jack power conversion means (500) and the charging method using the same are performed by directly connecting the automobile cigar jack power supply means and the battery, just as the solar power conversion means (400) directly connects the solar power supply means and the battery in SDCM mode, so the description thereof is omitted.

[0102]

[0103] As seen above, the portable power bank (100) according to the present invention has an attractive appearance by exposing only one charging connector to the outside while diversifying the charging power source, and has the effect of shortening the charging time of the battery unit (130) by charging by dividing the charging section into a first charging section (CCCV1) and a second charging section (CCCV2) in a constant voltage-constant current charging method.

[0104] In addition, the portable power bank (100) according to the present invention has the effect of reducing the possibility of malfunction in a low-power state where sunlight is insufficient by charging in SDCM mode that directly connects the solar power supply means and the battery when solar power (142) is in a low-power state and charging in PWM driving mode when it is in a high-power state, and increasing the charging efficiency and improving the durability of the power device by reducing the switching loss and stress on the power device due to PWM driving.

[0105]

[0106] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0107]

[0108] The scope of the present invention is indicated by the claims described below, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

[0109] 100: Power bank 110: Power input connector

[0110] 120: Control unit 130: Battery unit

[0111] 140: Power 141: Commercial power

[0112] 142: Solar power 143: Cigarette lighter power

[0113] 150: Power Judgment Unit 151: First Judgment Unit

[0114] 152: Second Judgment

[0115] 200: Power conversion unit

[0116] 300: Commercial power conversion means 310: Precharge circuit

[0117] 311: First precharge circuit 312: Second precharge circuit

[0118] 400: Solar power conversion means 411: First diode

[0119] 412: Second diode 413: Third diode

[0120] 420: Input current detection circuit 430: Input voltage detection circuit

[0121] 440: Converter current detection circuit 450: Battery current detection circuit

[0122] 460: Battery voltage detection circuit 471: First switch

[0123] 472: Second switch 481: First capacitor

[0124] 482: Second capacitor 490: Inductor

[0125] 500: Cigar Jack Power Converter

Claims

1. A portable power bank including a power input connector, a power judgment unit, a power conversion unit, a control unit, and a battery unit, The above power input connector is one, The above power judgment unit includes a first judgment unit that judges AC / DC and a second judgment unit that judges the voltage of DC power. The above power conversion unit is a mobile power bank including a commercial power conversion means, a solar power conversion means, and a cigarette lighter power conversion means.

2. In claim 1, The above commercial power conversion means comprises first and second pre-charge circuits, The above solar power conversion means is a mobile power bank characterized by including a converter and a power measuring means.

3. A method for charging a portable power bank according to claim 1 or 2, A step for determining whether the power input from the connector port is AC power or DC power. (a) a step of switching power using a commercial power conversion means when the input power is AC power; A step of converting the switched power to charge the battery unit. (b) If the input power is DC power, a step for determining whether the voltage is 18 V or higher; (b-1) A step for switching power using a solar power conversion means when the voltage is 18 V or higher. A step of converting the switched power to charge the battery unit. (b-2) A step for switching power using a cigarette lighter power conversion means when the voltage is less than 18 V. Including a step of converting the switched power to charge the battery unit, (c) a step of re-switching power to a solar power conversion means when the voltage rises above 18 V in the above step (b-2); A charging method of a portable power bank comprising a step of converting switched power to charge a battery unit 4. In claim 3 The above (a) charging step is a step of charging the battery unit with a constant first constant current; A step of charging the battery unit with a constant first constant voltage when the output voltage of the power conversion means reaches the first constant voltage during charging. A step of charging the battery unit with a constant second constant current when the output current of the above power conversion means reaches the second constant current; and A charging method for a portable power bank, comprising a step of charging a battery unit with a constant second constant voltage when the output voltage of the power conversion means reaches the second constant voltage.

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