KR101477239B1 - Auxiliary battery device with self-protection configuration in case of output terminal shortage - Google Patents

Abstract

The present invention relates to a device for protecting a short circuit when the short circuit is generated in an output terminal connected to an external device in an auxiliary battery device which provides power to the external device. The present invention may include a boosting convertor which boosts the output voltage of an internal battery and provides the same to the external device; and a resistance divider which determines the input voltage of a control terminal for controlling the on/off state of the boosting convertor.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an auxiliary battery device for preventing short-

The present invention relates to a method for protecting a secondary battery device when a short circuit occurs at an output terminal of the secondary battery device, and an apparatus therefor.

In addition to basic phone functions, the use time of games, the Internet, various applications, etc. has been greatly increased due to the characteristics of mobile devices such as smart phones, which have been expanding explosively in recent years. The operation current is greatly increased due to the introduction of large- The problem of capacity shortage is becoming a serious problem.

To solve these problems, there is a secondary battery device that can charge or replace the battery of the smartphone. A variety of products have been introduced depending on the form and use of the product such as a form in which the auxiliary battery device is manufactured as a single product, a form in which it is interlocked with a smartphone through a cable, or a form in which the device is directly mounted on a smartphone. These products have a built-in lithium secondary battery, which can charge the lithium secondary battery from the outside through an adapter, and charge the battery of an external device such as a smart phone through an output terminal.

However, due to the fact that a lithium secondary battery is incorporated in the secondary battery device, various safety accidents are occurring. In general, a lithium secondary battery is essentially used as a protection circuit for safe use. However, a boost converter used for supplying the charged energy of a battery to a smartphone or a load is short-circuited There are some products that do not have this part, and even if there is a short-circuit protection function, frequent shorting can damage the system and lead to malfunction of the system afterwards. These problems arise from the fact that companies manufacturing various related parts such as smartphones, secondary battery packs, adapters and cables are not the same, and that there is an imbalance in compatibility / quality between systems developed / produced by many manufacturers have.

The present invention provides a technique for protecting a secondary battery device even if a short circuit occurs between an external output terminal of a secondary battery device capable of assisting a user device such as a smart phone.

In order to solve the above problems, the present invention provides a method and apparatus for protecting a short circuit when an output terminal of the auxiliary battery device is short-circuited.

According to an aspect of the present invention, there is provided an auxiliary battery device provided with: a converter for receiving power stored in an internal battery and providing it to the outside; And a resistive voltage divider. At this time, the converter includes a supply voltage input terminal for receiving power stored in the internal battery, a voltage output terminal for supplying power to the outside, and a control terminal for receiving a control voltage for determining an operation state of the converter. A first side of the resistor voltage divider is connected to the supply voltage input terminal, a center of the resistor voltage divider is connected to the control terminal, and a second side of the resistor voltage divider is controlled by a potential of the voltage output terminal.

In this case, the converter is operated normally when the control voltage is logic-high and is shut down when the control voltage is logic-low, and the second side of the resistor voltage divider is connected directly to the voltage output terminal, Lt; / RTI >

At this time, the diode may be configured to prevent a current from flowing from the voltage output terminal to the control terminal.

At this time, a manual switch may be provided between the supply voltage input terminal and the internal battery.

In this case, the converter is shut down when the control voltage is logic-high, and operates normally when the control voltage is logic-low, and the auxiliary battery device is connected between the second side of the resistor voltage divider and the ground Further comprising a switch for switching an electrical connection state, wherein the switch can be controlled by the potential of the voltage output terminal.

At this time, when the switch is in an ON state, the potential of the second side of the resistive voltage divider is higher than a ground potential or a ground potential by a predetermined level, and when the switch is in an OFF state, It may be in a floating state.

At this time, if the voltage output terminal is not short-circuited, the converter operates normally, and if the voltage output terminal is short-circuited, the converter may be shut down.

According to another aspect of the present invention, there is provided a secondary battery device comprising: a converter for externally supplying power stored in an internal battery; And a controller adapted to control an operating state of the converter. At this time, the converter includes a voltage output terminal for supplying power to the outside, and a control terminal for receiving a control voltage for determining the operation state of the converter. The control unit controls the input voltage of the control terminal according to the potential of the voltage output terminal.

At this time, the control unit may include a resistive voltage divider.

In this case, the converter further includes a supply voltage input terminal for receiving power stored in the internal battery, a first side of the control unit is connected to the supply voltage input terminal, and a potential of the second side of the control unit is connected to the voltage output And may be controlled by the potential of the terminal.

The auxiliary battery device protection circuit provided according to another aspect of the present invention is a circuit for protecting the auxiliary battery device when a short circuit occurs in the voltage output terminal of the auxiliary battery device adapted to supply electric power to an external load. The circuit includes: a converter for providing power stored in an internal battery to the external load; And a resistive voltage divider adapted to determine a control voltage input to a control terminal provided in the converter for controlling the operating state of the converter. At this time, the potential of one side of the resistive voltage divider is controlled by the potential of the voltage output terminal.

According to the present invention, when a short circuit occurs between the output terminals of the auxiliary battery device, it is possible to prevent the damage and the safety accident of the auxiliary battery device due to a short circuit.

1A and 1B are views for explaining the structure of a general auxiliary battery pack. Here, FIG. 1A is a single current path type, and FIG. 1B is a configuration further including a bypass current path in the structure of FIG. 1A.
FIGS. 2A and 2B are views for explaining a structure including a manual switch in the auxiliary battery device shown in FIGS. 1A and 1B, respectively.
FIG. 3A is a view for explaining a form in which the bypass path shown in FIG. 1B is changed.
FIG. 3B is a view for explaining a structure that further includes a manual switch in the auxiliary battery device shown in FIG. 3A.
4 is a diagram for explaining an operating voltage range of a control terminal that determines whether or not the voltage step-up converter unit can be used in an embodiment of the present invention.
FIG. 5A is a diagram for explaining a case where the control terminal of the voltage-up converter unit operates in an active-high state in the auxiliary battery device according to the embodiment of the present invention.
5B is a view for explaining a structure including a manual switch in the auxiliary battery device of FIG. 5A.
FIG. 6A is a view for explaining a case where the control terminal of the voltage-up converter unit operates in an active-low state in the auxiliary battery device according to the embodiment of the present invention.
6B is a view for explaining a structure including a manual switch in the auxiliary battery device of FIG. 6A.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein, but may be implemented in various other forms. The terminology used herein is for the purpose of understanding the embodiments and is not intended to limit the scope of the present invention. In addition, the singular forms used below include plural forms unless the phrases expressly have the opposite meaning.

1A and 1B are views for explaining a structure of an auxiliary battery pack 100 as a basis of the present invention. Here, FIG. 1A is a single current path type, and FIG. 1B is a configuration including a bypass current path 21 in the structure of FIG. 1A.

A load 20 is connected to the output terminal of the auxiliary battery device 110, and an adapter (AC adapter) 10 is connected to the input terminal.

The adapter 10 is adapted to convert the power supply (AC voltage) of the system into a DC voltage form. For example, 110V or 220V is converted to 5V. One side of the output of the adapter 10 is connected to the reference potential GND of the auxiliary battery device 110 and the other side of the output of the adapter 10 is connected to the auxiliary battery device 110.

The auxiliary battery device 110 may include a step-down converter unit 120, an internal battery unit 130, and a boost converter unit 140.

At this time, the step-down converter unit 120 includes a first input terminal IN and a first output terminal BATT, and an output voltage of the adapter 10 is applied through the first input terminal IN have. At this time, the step-down converter unit 120 converts the output voltage of the adapter 10 into a voltage for charging the internal battery 11 to charge the internal battery 11. Generally, the constant current-constant voltage CC- ) Charging method is adopted. At this time, for example, the step-down converter unit 120 sets the DC voltage (ex: 5V), which is the output voltage of the adapter 10, to 4.2V (ordinary lithium rechargeable battery) ) Or the like. At this time, for example, the step-down converter unit 120 may be implemented using a buck converter.

The internal battery unit 130 may include an internal battery 11 and a protection circuit module 12 for preventing the internal battery 11 from overcharging, overdischarging, and overcurrent. At this time, the output voltage BATT of the step-down converter unit 120 is applied to the internal battery unit 130 so that the internal battery unit 130 is charged. At this time, the internal battery 11 can be implemented using, for example, lithium secondary battery. At this time, the internal battery 11 may be semi-permanently coupled to the auxiliary battery device 110 or may be detachable.

The step-up converter unit 140 is supplied with the charging power stored in the internal battery 11 through the supply voltage input terminal 140 (BATT). To this end, the voltage-up converter unit 140 is adapted to convert a voltage within the operating voltage range of the internal battery 11 into a DC voltage (ex: 5V) for charging the load 20, To the load 20, as shown in Fig. At this time, for example, the operating voltage range of the lithium secondary battery 11 is 3.0V to 4.2V, and the voltage within the range of 3.0V to 4.2V is converted into the DC voltage (ex: 5V). At this time, the voltage of the internal battery 11 may have various values depending on the type of the lithium secondary battery 11 and the configuration of the protection circuit 12.

At this time, for example, the boost converter unit 140 may be implemented using a boost converter. In one embodiment, step-up converter unit 140 may include a control unit, a reference voltage unit, an oscillator, a hysteresis comparator, and the like. A supply voltage input terminal 140, a BATT, a control terminal ON, a voltage output terminal POUT, and a feedback input terminal FB.

At this time, the operable voltage applied through the supply voltage input terminal 140 (BATT) may be, for example, a voltage between 1.2V and 5V. This voltage range may vary depending on a specific implementation of boost converter section 140. [

At this time, the control terminal ON controls the on / off state of the logic of the step-up converter unit 140. The control terminal ON operates in an active-high state, and in the case of having a value of a low state, the voltage-up converter unit 140 enters a so-called " shutdown " mode. In the shutdown mode, the control circuit, the internal switching MOSFET, and the synchronous rectifier in the step-up converter unit 140 are turned off. When the control terminal (ON) has a value of a high state, the step-up converter unit 140 operates in a normal state. As a result, when the control terminal ON is controlled to be on-state, power is supplied to the load 20, and when the control terminal ON is controlled to be off-state, .

The voltage output terminal (POUT) is a power output terminal of the boost converter section (140).

The feedback input terminal FB is a terminal for receiving an input for adjusting the output voltage of the step-up converter unit 140.

As the step-up converter unit 140, for example, a chip having the name MAX8815A of Maxim can be used. For the MAX8815A, the control terminal (ON) is designed to have an active-high characteristic. Alternatively, another type of chip in which the control terminal ON has an active-low characteristic may be used as the boost converter unit 140. [

In an embodiment of FIG. 1A, a chip having the name MAX8815A of Maxim Corp. may be used as the boost converter unit 140. The method of using such a commercial chip is well described in the specifications of the chip, and the circuit of FIG. 1A is an example made on the basis of such a specification. 1A, the supply voltage input terminal 140 (BATT) is directly connected to the control terminal ON, and the voltage output terminal POUT is directly connected to the feedback input terminal FB.

The auxiliary battery device 110 shown in FIG. 1A has a single current path. That is, the adapter 10, the step-down converter unit 120, the internal battery unit 130, the step-up converter unit 140, and the load 20 are located in the same current path. In this structure, when the internal battery 11 included in the auxiliary battery device 110 is discharged or the negative battery included in the load 20 is discharged, the step-down converter 120 is connected to the internal battery 11 And the secondary battery is charged at the same time. At this time, the capacity of the power converter (for example, the step-down converter unit 120) must be increased in order to charge the internal battery 11 and the subordinate battery at the same time sufficiently fast. In addition, if the step-up converter unit 140 does not have the short-circuit protection function for the voltage output terminal POUT, the auxiliary battery device 110 may be damaged. Also, the step-up converter unit 140 may be operated at all times to accelerate the self-discharge of the auxiliary battery device 110.

Meanwhile, the auxiliary battery device 110 shown in FIG. 1B has a structure that further includes a diode D1 in the auxiliary battery device 110 of FIG. 1A. The diode D1 is connected between the first terminal 30 connected to one side of the adapter 10 and the second terminal 40 connected to the external input terminal INPUT of the load 20 . As a result, a bypass path 21 bypassed from the adapter 10 to the load 20 is formed. By the bypass path 21, the secondary battery can be charged with priority over the internal battery 11. When such a priority charging condition is desired, the necessity of increasing the capacity of the step-down converter unit 120 from the auxiliary battery device 110 shown in Fig. 1A is reduced. However, when the voltage output terminal POUT of the auxiliary battery device 110 is short-circuited (that is, when the node 40 is directly connected to the reference potential GND), the adapter 10 and the boost converter unit 140 are damaged A problem may arise.

2A and 2B are diagrams for explaining a structure in which the manual switch 60 is further included in the auxiliary battery device 110 shown in FIGS. 1A and 1B, respectively.

As shown in Figs. 2A and 2B, the manual switch 60 is a switch that can be manually operated by a user. The switch 60 is connected to the first output terminal 50 (BATT) of the step-down converter unit 120, And a supply voltage input terminal 140 (BATT) of the power supply 140. At this time, when the manual switch 60 is opened, the current consumption due to the normal operation of the step-up converter unit 140 can be minimized, and the user can control whether or not the power to the load 20 is supplied. For example, when the user controls the manual switch 60 to ON, the power supply to the load 20 is allowed. When the manual switch 60 is controlled to be OFF, the load 20 In order to prevent the power supply from being interrupted.

FIG. 3A is a view for explaining a modification of the bypass path 21 shown in FIG. 1B.

FIG. 3B is a view for explaining a structure including the manual switch 60 in the auxiliary battery device 110 shown in FIG. 3A.

3A, a diode D1 is connected between the first terminal 30 and the supply voltage input terminal 140 and a diode Dl is connected between the third terminal 50 and the supply voltage input terminal 140, And a diode D2 is connected between them. The diodes D1 and D2 prevent the power of the internal battery unit 130 from being supplied to the first terminal 30 when the first terminal 30 is short-circuited. So that the output voltage of the battery 10 is prevented from being directly inputted to the internal battery unit 130.

Here, the bypass path 21 according to the structure of FIG. 1B has a form in which the adapter 10 directly controls the current when the voltage output terminal POUT is short-circuited. The adapter 10 and the step-up converter unit 140 may be damaged. 3A, when the bypass path is connected to the supply voltage input terminal 140 (BATT) of the step-up converter unit 140, the voltage step-up converter unit 140 It has an advantage that a minimum current control can be performed.

3B, the auxiliary battery device 110 may further include a manual switch 60 connected between one side of the diode D2 and the supply voltage input terminal 140 (BATT). At this time, as described in FIGS. 2A and 2B, the user can directly control the manual switch 60 to control whether power is supplied to the load 20. FIG.

FIG. 4 is a diagram for explaining the operating voltage range of the control terminal ON, which determines whether the voltage step-up converter unit 140 is operable, according to an embodiment of the present invention.

In general, the operation mode of a control terminal (for example, ON or EN) for controlling the operation of the converter can be classified into an active-high mode and an active-low mode, Each operating voltage range can be defined. 4, the first voltage range 41 and the second voltage range 42 are set to the normal operating voltage range and the shutdown voltage range of the step-up converter unit 140, respectively, in the active-high mode Can be defined. Conversely, in the active-low mode, the first voltage range 41 and the second voltage range 42 can be defined as the shutdown voltage range and normal operating voltage range of the voltage-up converter unit 140, respectively.

At this time, the first voltage range 41 may indicate the range of the potential (ON_High MIN) to the potential (BATT) with reference to the potential (BATT) of the internal battery 11. Also, the second voltage range 42 can indicate the range of the potential (GND) to the potential (ON_Low MAX) with reference to the potential (GND). For example, when the supply input voltage BATT is 3.6 V, the first voltage range 41 in the case of the active-high method may be 2.6 V to 3.6 V and the second voltage range in the case of the active- 42 may be between 0V and 1V.

In this case, for example, in the active-high mode, if the input voltage Von of the control terminal ON is 3 V, the boost converter unit 140 is operated because it corresponds to the first voltage range 41, If the input voltage Von of the terminal ON is 2 V, the operation of the voltage step-up converter unit 140 is stopped because it does not correspond to the first voltage range 41. [ In the case of the active-low mode, when the input voltage Von of the control terminal ON is 0.5 V, it corresponds to the second voltage range 42, so that the voltage-up converter unit 140 is operated and the control terminal ON The input voltage Von of the step-up converter unit 140 does not correspond to the second voltage range 42 and thus the operation of the step-up converter unit 140 is stopped.

Hereinafter, an auxiliary battery pack 200 according to an embodiment of the present invention will be described.

5A is a view for explaining a case where the control terminal ON of the voltage boost converter unit 140 in the auxiliary battery device 210 according to the embodiment of the present invention operates in an active-high state.

5B is a view for explaining a structure that further includes a manual switch 60 in the auxiliary battery device 210 of FIG. 5A.

As shown in FIG. 5A, the auxiliary battery device 210 has a structure further including the resistor voltage divider 160 in the auxiliary battery device 110 shown in FIG. 3A. At this time, the first side of the resistor divider 160 is connected to the supply voltage input terminal 140 (BATT), the center of the resistor divider 160 is connected to the control terminal ON, and the resistor divider 160 ) Is connected to a voltage output terminal (POUT) through a diode (D3). Therefore, the potential of the second side of the resistor divider 160 is controlled by the potential of the voltage output terminal POUT and the forward voltage of the diode D3. The resistor divider 160 includes two resistors R1 and R2 and the center is a fourth terminal 51 connected between the two resistors R1 and R2. have.

5A, the voltage output terminal POUT does not short-circuit and the output voltage Vout of the voltage output terminal POUT of the voltage-up converter unit 140 becomes the supply input voltage VOUT. (BATT), the current output from the voltage output terminal (POUT) can flow back to the internal battery unit (130) through the resistor divider (160). The diode D3 provided between the resistor divider 160 and the voltage output terminal POUT functions to prevent this backflow.

At this time, in one embodiment of the present invention, the value of the resistor R1 is 100K, the value of the resistor R2 is 10K, the supply input voltage BATT is 3.6V, and the forward voltage Dfv of the diode is 0.7V. ≪ / RTI > This is a value assumed to describe an embodiment of the present invention, and the present invention is not limited to the embodiment, but may be variously implemented according to a value designed by a user.

The voltage output terminal POUT of the boost converter 140 is in a steady state and the potential of the control terminal ON is lower than the potential of the voltage output terminal POUT in the auxiliary battery device 210 according to an embodiment of the present invention. If it is low, no current flows through the resistor R1, the resistor R2, and the diode D3. Therefore, when the voltage output terminal POUT is in a normal state, the potentials of the supply voltage input terminal 140 (BATT) and the control terminal ON are the same. At this time, assuming that the internal battery 11 is fully charged and the voltage of the supply voltage input terminal 140 (BATT) is 3.6 V, the boost converter unit 140 operates normally.

When the voltage output terminal POUT of the step-up converter unit 140 is short-circuited, that is, when the potential of the voltage output terminal POUT becomes equal to the reference potential, the potential of the supply voltage input terminal 140 (BATT) Becomes higher than the potential of the voltage output terminal (POUT), so that current flows through the resistor divider (160) and the diode (D3). Therefore, the potential of the supply voltage input terminal 140 (BATT) is divided through the resistor divider 160 and applied to the control terminal ON. That is, the input voltage Von of the control terminal ON is determined based on the divided ratios of the two resistors R1 and R2. At this time, for example, the input voltage Von of the control terminal ON can be calculated as [Expression 1].

[Equation 1]

The input voltage Von of the control terminal ON is 0.74 V and does not correspond to the first voltage range 41, so that the voltage step-up converter unit 140 stops operating. That is, since the power supply to the load 20 is stopped, the boost converter unit 140 is not damaged.

At this time, the input voltage Von of the control terminal ON is not limited to the above-described embodiment, but can be adjusted by changing the voltage division ratio of the resistor.

5B, the auxiliary battery device 210 may further include a manual switch 60 connected between one side of the diode D2 and the supply voltage input terminal 140 (BATT). According to such a structure, the user can directly control the manual switch 60 to control whether power is supplied to the load 20. [

FIG. 6A is a diagram for explaining a case where the control terminal ON of the boost converter unit 140 in the auxiliary battery device 210 according to an embodiment of the present invention operates in an active-low state.

6B is a view for explaining a structure that further includes a manual switch 60 in the auxiliary battery device 210 of FIG. 6A.

As shown in FIG. 6A, the auxiliary battery device 210 according to the embodiment of the present invention has a structure including the resistor voltage division part 160 in the auxiliary battery device 110 shown in FIG. 3A. At this time, the first side of the resistor divider 160 is connected to the supply voltage input terminal 140 (BATT), the center of the resistor divider 160 is connected to the control terminal ON, and the resistor divider 160 ) Is connected to one end of the switch (70). The switch 70 may be a transistor, and its gate may be controlled by the potential of the voltage output terminal POUT. As a result, the switch 70 functions to switch the second side of the resistor divider 160 to a floating state or to be connected to the reference potential GND. At this time, the resistor divider 160 includes two resistors R1 and R2, and the center indicates a fourth terminal 51 connected between the two resistors R1 and R2 do.

In the auxiliary battery device 210 according to the embodiment of the present invention, when the voltage output terminal POUT of the voltage up converter unit 140 is not short-circuited, the output voltage Vout of the voltage output terminal POUT is The switch 70 can have a potential high enough to turn it on. As a result, the switch 70 is turned on, and the second side of the resistor divider 160 can have the same potential as the reference potential. Therefore, when the voltage of the supply voltage input terminal 140 (BATT) is larger than the reference potential, a current can flow through the resistor divider 160. As a result, the voltage of the supply voltage input terminal 140 (BATT) is divided through the resistor divider 160 and applied to the control terminal ON. At this time, the input voltage Von of the control terminal ON is determined based on the partial pressure ratio of the two resistors R1 and R2. At this time, for example, the input voltage Von of the control terminal ON can be calculated as shown in [Equation 2].

[Equation 2]

The input voltage Von of the control terminal ON becomes 0.04 V and corresponds to the second voltage range 42 as shown in the above-mentioned formula (2), so that the boost converter section 140 is normally operated.

On the other hand, when a short circuit occurs in the voltage output terminal POUT of the voltage-up converter unit 140, the voltage of the voltage output terminal POUT becomes 0V and the switch 70 is turned to the turn-off state . Thus, the input voltage Von of the control terminal ON becomes the same potential as the supply voltage input terminal 140 (BATT) and the operation of the voltage-up converter 140 is stopped (that is, shutdown). That is, since the power supply to the load 20 is stopped, the boost converter unit 140 is not damaged.

At this time, the input voltage of the control terminal (ON) is not limited to the above-described embodiment, but can be adjusted by changing the voltage division ratio of the resistor.

6B, the auxiliary battery device 210 may further include a manual switch 60 connected between one side of the diode D2 and the supply voltage input terminal 140 (BATT). According to such a structure, the user can directly control the manual switch 60 to control whether power is supplied to the load 20. [

The step-up converter 140 described above functions to output power having a potential sufficient to charge the secondary battery included in the load 20. [ In an embodiment of the boost converter 140 that is actually implemented and sold, it may be arranged to always provide an output voltage of 5 V, for example, by setting. In this case, if the internal battery 11 provides power at a voltage of 5.5V, the boost converter 140 may rather provide a reduced output voltage from the input voltage. For the sake of convenience, the term 'step-up' converter is used in the detailed description of the present specification, but the scope of the present invention is not limited by the term 'step-up'. Thus, the converter of reference numeral 140 described with reference to the accompanying drawings herein may be referred to as a step-up converter or simply a converter.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the essential characteristics thereof. The contents of each claim in the claims may be combined with other claims without departing from the scope of the claims.

10: Adapter
11: Internal battery
20: Load
120: Step-down converter section
130: internal battery part
140: converter, step-up converter section
160: Resistance divider
210: auxiliary battery device
D3: Diode

Claims (11)

A converter for receiving DC power stored in an internal battery and providing the DC power to the outside; And
Resistive voltage divider;
The auxiliary battery device comprising:
The converter includes a supply voltage input terminal for receiving DC power stored in the internal battery, a voltage output terminal for supplying power to the outside of the auxiliary battery device, and a control terminal for receiving a control voltage for determining an operation state of the converter ≪ / RTI &
A first side of the resistor voltage divider is connected to the supply voltage input terminal, a center of the resistor voltage divider is connected to the control terminal, and a potential of the second side of the resistor voltage divider is controlled by the potential of the voltage output terminal there is,
A secondary battery device. The method according to claim 1,
The converter is normally operated when the control voltage is logic-high and is shut down when the control voltage is logic-low,
The second side of the resistive voltage divider being connected directly to the voltage output terminal or via a diode,
A secondary battery device. 3. The secondary battery device according to claim 2, wherein the diode is arranged to prevent current from flowing from the voltage output terminal to the control terminal. The secondary battery device according to claim 1, wherein a manual switch is provided between the supply voltage input terminal and the internal battery. The method according to claim 1,
The converter is shut down when the control voltage is logic-high and operates normally when the control voltage is logic-low,
Further comprising a switch for switching an electrical connection state between a second side of the resistive voltage divider and the ground,
Wherein the switch is controlled by a potential of the voltage output terminal,
A secondary battery device. 6. The method of claim 5,
The second side of the resistive voltage divider has a potential higher than the ground potential or the ground potential by a predetermined level when the switch is in an ON state and the second side of the resistive voltage divider is in a floating state Lt; / RTI >
A secondary battery device. The secondary battery device according to claim 1, wherein the converter operates normally when a short circuit does not occur at the voltage output terminal, and the converter is shut down when a short circuit occurs at the voltage output terminal. A converter for providing DC power stored in the internal battery to the outside; And
A controller adapted to control an operating state of the converter;
The auxiliary battery device comprising:
The converter includes a voltage output terminal for providing power to the outside of the auxiliary battery device and a control terminal for receiving a control voltage for determining an operation state of the converter,
Wherein the control unit is configured to control an input voltage of the control terminal according to a potential of the voltage output terminal,
A secondary battery device. 9. The secondary battery device according to claim 8, wherein the control section includes a resistor voltage divider. 9. The method of claim 8,
The converter further includes a supply voltage input terminal for receiving power stored in the internal battery,
Wherein the first side of the control section is connected to the supply voltage input terminal and the potential of the second side of the control section is controlled by the potential of the voltage output terminal,
A secondary battery device. A circuit for protecting the auxiliary battery device when a short circuit occurs in the voltage output terminal of the auxiliary battery device adapted to provide power to an external load,
A converter for providing DC power stored in the internal battery to the external load; And
A resistive voltage divider adapted to determine a control voltage input to a control terminal provided in the converter to control an operating state of the converter;
/ RTI >
Wherein a potential of one side of the resistive voltage divider is controlled by a potential of the voltage output terminal,
Auxiliary battery device protection circuit.

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