KR20050034441A - A method and a apparatus of charging for rechargeable battery - Google Patents

Abstract

The present invention provides a fast charging of the charge-discharge battery with a minimum power loss, the battery unit for charging and storing the current and repeating the current output stored by the discharge; A detection adjusting unit detecting switching voltage of the battery unit and controlling switching constant current charging and linear constant voltage charging; A power supply unit supplying a constant current power to be charged in the battery unit; Power supply DC conversion unit for converting the DC power to a stable DC power output by the control; A constant current unit controlling the DC converter to supply a constant current according to a switching control signal of a detection controller; A first step of determining whether the battery is charged by a charging / discharging battery charging device, characterized by comprising a constant voltage unit configured to control the DC converter to supply a constant voltage according to a linear control signal of a detection adjusting unit; If it is determined that the battery is being charged in the above process, the second process of charging the constant current type; A third step of determining whether the battery is fully charged in the step; In the process of charging with a constant current according to the feature of the fourth process of charging the linear type constant voltage when judged in the above process, the charging by the switching method reduces the power loss due to heat and at the same time fast charging, linear in the full charge state By controlling the constant voltage precisely in the manner, there is an effect of maintaining a full charge state.

Description

Charging and discharging battery charging apparatus and method {A METHOD AND A APPARATUS OF CHARGING FOR RECHARGEABLE BATTERY}

The present invention relates to a rapid charging of a mobile terminal charging and discharging battery, and more particularly, to a charging and discharging battery charging apparatus and method for reducing the heat generation to minimize the power loss and rapid charging.

The mobile terminal (MS: MOBILE STATION) is a wireless communication with the other party anytime and anywhere while moving freely in the mobile communication service area, there is a convenience to communicate while moving.

The operating power necessary for the mobile terminal to communicate while moving is supplied from a battery, and the battery has a limited current supply capacity used as the operating power, and replaces with a new one when all the current that can be supplied is consumed. It is expensive to maintain, and due to environmental problems, a rechargable battery that can be reused repeatedly is used.

The charging / discharging battery (hereinafter referred to as a battery) supplies current by a discharge (DISCHARGE), consumes the current as an operating power source in a mobile terminal, and uses a charger to charge the required capacity of the discharged current as described above. By charging, it is called a nickel cadmium battery, a lithium ion battery, etc. according to the kind of material constituting the battery, and generally outputs a direct current (DC) of about 4.2 volts (V).

Since the user of the portable terminal is generally very active, it is preferable to use the battery for a long time with a single charged battery and to shorten the charging time.

In order to charge the battery all of its capacity in a short time, a large amount of charging current is supplied, and the charger for supplying the charging current has a voltage drop in each circuit element due to the characteristics of the circuit elements that are configured (DROP VOLTAGE). Is generated, heat is generated by the voltage drop, and the heat is generated in the process of losing the supplied current.

Therefore, in order to charge the charge / discharge battery quickly, it is necessary to develop a charging device that minimizes heat generation by loss.

Hereinafter, a charge and discharge battery charging device according to the prior art will be described with reference to the accompanying drawings.

Attached to explain the prior art, Figure 1 is a functional block diagram of the charging and discharging battery charger according to the prior art.

Referring to FIG. 1, the charging / discharging battery charging apparatus according to the prior art includes a battery for storing a current of a constant capacity, supplying a current stored by discharge, and repeating a process of inputting and storing current by charging. 10; A power supply unit (PS) 30 for supplying power for charging the battery 10; A first transistor TR1 for passing or blocking power supplied from the power supply unit 30 by a corresponding control; A diode (D) which removes an overvoltage component of the power supply unit 30 applied through the first transistor TR1 and rapidly charges and discharges the inductor L described later; An inductor (L) for removing noise components from a power supply supplied through the first transistor (TR1) and converting the DC voltage of the power supply to a DC voltage having a different level; A second resistor (R2) for performing a load process so that power applied from the power supply unit 30 through the inductor L is supplied to the next stage; A battery (10) for receiving and charging power applied through the second resistor (R2); A controller 20 for detecting and analyzing a voltage state of the battery 10 and outputting a corresponding control signal; A second transistor TR2 that is turned on / off by a control signal CON output from the controller 20; The first resistor R1 is configured to be connected to the collector terminal of the second transistor TR2 and to apply an on / off control signal to the base terminal of the first transistor TR1 by an on / off operation.

Hereinafter, a charging / discharging battery charging device according to the related art having the above configuration will be described in detail with reference to FIG. 1.

When the battery 10 is connected to be charged, the controller 20 senses the connection of the battery 10 and controls the control signal CON in an ON state to a base terminal of the second transistor TR2. )

Since the second transistor TR2 is operated in an ON state by the control signal CON applied from the controller 20, the second transistor TR2 is turned on in the first transistor TR1 connected through the first resistor R1. To control.

As the power supplied from the power supply unit 30 by the first transistor TR1 operating in the on state as described above, the overvoltage component is removed by the diode and is applied to the inductor L to repeat the charging and discharging. DC / DC conversion is performed, and charge and discharge for the DC / DC conversion is quickly promoted by the diode.

The DC voltage signal as described above is supplied to the battery 10 through the second resistor R2 serving as a load.

As described above, the state of charging the battery 10 by applying the current supplied from the power supply unit 30 without limitation is called rapid charging by current control, and the controller 20 continuously checks the voltage of the battery 10. For example, when the full charge state is 4.2 volts (V), since the signal for controlling the second transistor TR2 is not output, charging of the battery 10 by the power supply unit 30 temporarily stops. Is stopped.

The controller 20 continuously monitors the charging voltage of the battery 10 in a state where charging is suspended in the above fully charged state and reaches a voltage of 4.2 volts or less. The control signal CON is output to the base terminal, so that the power of the power supply unit 30 is supplied to the battery 10 again and charged, so that the battery 10 becomes a 4.2 volt voltage in a fully charged state again. Since the controller 20 again blocks the control signal CON output to the second transistor TR2, the controller 20 accurately maintains the battery 10 at a voltage of 4.2 volts.

The control unit 20 maintains the voltage of the fully charged battery 10 as described above and is constant, and the above control is a linear control method by voltage control.

However, in the prior art as described above, when rapid charging, heat is generated by a voltage drop (DROP VOLTAGE) of each functional unit, and due to the heat generation, a large amount of current cannot flow at a time, resulting in a long time required for charging and heat generation. There is a problem that a separate additional means for suppression is required.

According to the present invention, the charging / discharging battery reduces the loss due to heat generation and thus reduces the charging time since the battery is rapidly charged by the constant current switching method until the battery is fully charged and the charging voltage is precisely maintained by the linear constant voltage charging in the fully charged state. It is an object to provide a charging device and method.

The present invention devised to achieve the above object, the battery unit for charging and storing the current and repeating the current output stored by the discharge; A detection adjusting unit detecting switching voltage of the battery unit and controlling switching constant current charging and linear constant voltage charging; A power supply unit supplying a constant current power to charge the battery unit; A DC conversion unit converting and outputting the DC power to the stable DC power by control; A constant current unit controlling the DC converter to supply a constant current by a switching control signal of the detection controller; And a constant voltage unit configured to control the DC converter to supply a constant voltage according to the linear control signal of the detection adjustment unit.

In addition, the present invention devised to achieve the above object, the first process of determining whether to charge the battery by the charging and discharging battery charger; If it is determined that the battery is being charged in the above process, a second process of charging the constant current type; A third step of determining whether the battery is fully charged in the step; If it is determined in the above process and fully charged, the fourth process of charging the linear constant voltage.

Hereinafter, a charging and discharging battery charging apparatus and method for a portable terminal according to the present invention will be described with reference to the accompanying drawings.

Attached to illustrate the present invention, Figure 2 is a functional block diagram of the charging and discharging battery charging apparatus according to the present invention, Figure 3 is a flow chart of the charging and discharging battery charging method according to the present invention.

Referring to FIG. 2, the charging / discharging battery charging device for a portable terminal according to the present invention includes a battery unit 100 that continuously stores and stores current by charging a certain amount of current and discharges the current output stored by discharging. ,

By controlling the charging constant current charging and the linear constant voltage charging by detecting the charging voltage of the battery unit 100, the load (LOAD) function so that the voltage signal output from the DC converter 130 is applied to the battery unit 100 A second resistor R2; Detects the current flowing through the second resistor R2 and analyzes the calculated voltage to output a switching control signal for controlling the constant current unit 140 on and off, and detects the charging voltage of the battery unit 100 to determine the constant voltage. A detection adjusting unit 170 including a control unit 110 for outputting linear control signals for controlling the unit 150 on and off,

A power supply unit 120 supplying a constant current DC power to be charged in the battery unit 100;

By converting and outputting the constant current DC power of the power supply unit 120 to the DC power stably under control, controlling the DC power supply of the power supply unit 120 by the on-off control signal applied from the constant current unit 140, A first transistor (TR1) comprising a field effect transistor (FET: FIELD EFFECT TR) for increasing power supply efficiency applied from the power supply unit 120 and facilitating control; An inductor (L) for repeatedly charging and discharging the DC power applied from the first transistor TR1 and converting the DC power back to the DC power; A direct current conversion unit (130) including a diode (D: DIODE) that cuts off an overvoltage of a power applied from the first transistor TR1 and accelerates charging and discharging of the inductor L;

The DC converter 130 controls the constant current to be supplied by the switching control signal of the detection adjusting unit 170. The DC by the switching control signal applied from the detection adjusting unit 170. A second transistor TR2 for controlling the converter 130 to supply a constant current without a loss generated by heat; A constant current unit 140 including a first resistor R1 for applying a switching result signal of the second transistor TR2 to the first transistor TR1 of the DC converter 130;

The DC converter 130 controls the DC converter 130 to supply a constant voltage according to the linear control signal of the detection adjusting unit 170. The DC converter 130 supplies the constant voltage according to the LINEAR control signal. It consists of the constant voltage part which consists of 3rd transistors TR3 which control to supply.

Hereinafter, according to the present invention having the above configuration, it will be described in detail with reference to the accompanying drawings, the charging and discharging battery charging device for a mobile terminal.

The battery 100 for charging and discharging for supplying operation power to the mobile terminal MS is to charge and store a current applied from the power supply unit 120 by a constant capacity, and the battery 100 is connected to a charging device for charging. Is detected by the control unit 110 of the detection adjusting unit 170.

The controller 110 confirming that the battery 100 is to be charged as described above outputs the corresponding control signals CON1 and CON2 having a high level to the constant current unit 140 and the constant voltage unit 150, respectively, and thus, the second control unit 110. The transistor TR2 and the third transistor TR3 are turned ON to turn on the first transistor TR1 formed of the FET.

The constant current of the power supply unit 120 is applied to the inductor L and the diode D by the turn-on of the first transistor TR1, and the overvoltage is blocked by the diode D, and the inductor L of the inductor L The charge and discharge are converted into a DC voltage having a different level, and the charge and discharge of the inductor L is promoted by the diode D, so that the DC / DC conversion of the DC converter 130 is performed. This works stably.

The current output from the DC converter 130 is applied to the battery unit 100 through the second resistor R2 to charge the battery unit 100.

In the charging process as described above, the second resistor R2 generates heat by a current flowing in a constant current, and the resistance component becomes larger due to the heat generation, so that the voltage drop DROP VOLTAGE Vr increases, and the Vr1 point and the Vr2 point. Difference occurs in the voltage.

The voltages of the points Vr1 and Vr2 are detected by the controller 110 and inputted and analyzed as a digital signal by analog / digital conversion (ADC). When the voltage difference is greater than a predetermined value, the first control signal Since the output of the CON1 is cut off, the second transistor TR2 constituting the constant current unit 140 is turned OFF and the first transistor TR1 including the FET of the DC converter 130. ) Is turned off, and the constant current applied from the power supply unit is not applied to the battery unit 100 through the second resistor R2.

Heat is suppressed by the above process, and the control unit 110 outputs the first control signal CON1 again by switching, so that the constant current unit 140 is turned on and the DC converter 130 is turned on. Since the turn-on operation, the process in which the constant current of the power supply unit 120 is supplied back to the battery unit 100 through the second resistor R2 is repeatedly repeated.

The switching operation as described above reduces the power loss due to heat and supplies a large amount of constant current to the battery unit 100, thereby reducing the charging time of the battery unit 100.

As an experimental example, the prior art when the voltage input from the power supply unit 120 is 5.5 volts (V), the voltage of the battery unit 100 is 3.3 volts (V), and the constant current charged is 1 amp (A). The power loss of the linear method and the switching method according to the present invention are calculated as follows.

Since the power loss calculation by the linear method of the prior art is (Vin-Vbatt) * I, a power loss value of (5.5 V-3.6 V) * 1 (A) = 1.9 watts (W) is calculated.

In the power loss calculation by the switching method of the present invention, when the efficiency of the switching method is set to about 90%, a power loss of (3.6 V * 1A) / 10 = 0.36 watt (W) is calculated.

Therefore, it is calculated that the switching method according to the present invention reduces the power loss by about 1/5.

When the battery unit 100 is fully charged by the switching method as described above, that is, the controller 110 detects the charging voltage Vr2 of the battery unit 100 and inputs and analyzes the digital value by ADC conversion. Check that the battery unit is fully charged.

For example, in the case of a lithium ion charge / discharge battery, when the voltage in the fully charged state is 4.2 volts (V), and the voltage measured at the control point 110 by the controller 110 is 4.2 volts, the battery unit 100 is fully charged. I think that.

In the fully charged state as described above, the controller 110 outputs the first control signal CON 1 as a fixed high level signal, so that the second transistor TR2 of the constant current unit 140 is turned on. And the second control signal CON2 for turning off the third transistor TR3 constituting the constant voltage unit 150 is turned off, so that the DC converter 130 is turned off. The current of the power supply unit 120 may not be applied to the battery unit 100 through the second resistor R2.

The controller continuously detects the voltage at the point of Vr2 and outputs the second control signal CON2 in a high state when the voltage drops below a predetermined level, so that the constant voltage unit 150 is turned on and the constant current unit Since the DC converter 130 is dun-on, the constant current of the power supply 120 is applied to the second resistor through the DC converter 130, and thus the battery unit 100 starts to be charged.

The control unit 110 continuously detects the voltage at the Vr2 point, checks whether the battery unit 100 is in a fully charged state, and, if the fully charged state, controls the turn-off of the constant voltage unit 150. The process of outputting the signal CON2 is repeatedly repeated.

Since the above process must be precisely voltage controlled, it is processed in a linear manner and is called a constant voltage process.

That is, the present invention, in order to reduce the power loss due to heat in the constant current process and to reduce the charging time, the constant current is supplied in a switching method in which the error (TOLERANCE) may be large, and in a fully charged state, the constant voltage in a linear manner for precise voltage control Take control.

Hereinafter, with reference to the accompanying Figure 3, the charging and discharging battery charging method according to the present invention.

A first step (S110) of determining whether to charge or discharge the battery 100 by the charge / discharge battery charging device for the mobile terminal;

When it is determined that the battery 100 is charged in the first process (S110), the switching method is to charge the constant current to turn on the constant voltage unit 150 by the controller 110 constituting the charging device. A second process (S120) of outputting a control signal and outputting a switching control signal to the constant current unit 140 when the voltage difference Vr1-Vr2 detected across the second resistor R2 is large; ,

A third process (S130) of determining whether the battery 100 is fully charged in the second process (S120),

If it is determined in the third process and is fully charged, the linear type constant voltage charging is performed, and a control signal for turning on the constant current unit 140 by the controller 110 is output, and the second resistor R2 is output. And a fourth step S140 of detecting the voltage at the contact point of the battery unit 100 and outputting a linear control signal to the constant voltage unit 150 when the voltage is greater than or equal to a predetermined voltage.

Hereinafter, a charging / discharging battery charging method according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

The charging and discharging device determines whether the battery unit 100 installed for charging is detected (S110), and when it is determined that the battery is to be charged in the process (S110), the charging / discharging device controls the constant current unit 140 by a switching method. By supplying the constant current of the power supply unit 120 to the battery unit 100 without a power loss due to heat generation to charge quickly (S120), it is determined whether the full charge of the corresponding level due to the characteristics of the battery unit (S130).

In the determination, when the battery unit 100 is fully charged quickly without power loss due to heat generation in a switching method, the voltage of the battery unit 100 is continuously controlled in a linear manner for precise voltage control (S140).

In the case of charging the battery unit as described above, the present invention, since the constant current is supplied by the switching method, the rapid charging, when the rapid charging is completed and the full charge state by the switching method as described above, the constant voltage charging precisely by the linear method Keep going.

According to the present invention having the above configuration, in the charging / discharging battery, there is an industrial use effect of reducing the power loss due to heat by charging with a switching method in a section charging with a constant current.

In addition, in the fully charged state, there is a convenient effect in use to maintain the full charged state by precisely controlling the constant voltage in a linear manner.

1 is a functional block diagram of a charging and discharging battery charger according to the prior art,

2 is a functional block diagram of a charging and discharging battery charging device according to the present invention;

Figure 3 is a flow chart of the charging and discharging battery charging method according to the present invention.

          ** Explanation of symbols on the main parts of the drawing **

100: battery unit 110: control unit

120: power supply unit 130: DC conversion unit

140: constant current unit 150: constant voltage unit

170: detection adjustment unit

Claims (9)

A battery unit which charges and stores current and repeats the stored current output by discharge; A detection adjuster for detecting switching voltage of the battery unit and controlling switching constant current charging and linear constant voltage charging; A power supply unit supplying a constant current power to be charged in the battery unit; A DC converter converting and outputting the DC power from the power supply unit into a stable DC power by control; A constant current unit controlling the DC converter to supply a constant current by a switching control signal of the detection controller; And a constant voltage unit configured to control the DC converter to supply a constant voltage according to a linear control signal of the detection adjustment unit. The method of claim 1, wherein the detection adjustment unit, A second resistor functioning as a load so that the voltage signal output from the DC converter is applied to the battery unit; Detecting a current flowing through the second resistor and analyzing a calculated voltage to output a switching control signal for controlling the constant current unit on and off; and detecting a charging voltage of the battery unit to control the constant voltage unit on and off. Charge and discharge battery charging device characterized in that the configuration consisting of a control unit for outputting. The method of claim 1, wherein the DC converter, A first transistor for controlling a DC power supply of the power supply unit by an on-off control signal applied from the constant current unit; An inductor for repeatedly charging and discharging the DC power applied from the first transistor and converting the DC power back to the DC power; A charge / discharge battery charging device comprising a diode which cuts off an overvoltage of a power applied from the first transistor and quickly charges and discharges the inductor. The method of claim 3, wherein the first transistor, Charging and discharging battery charging device characterized in that the configuration consisting of a field effect transistor to increase the power supply efficiency applied from the power supply and to facilitate the control. The method of claim 1, wherein the constant current unit, A second transistor which controls the DC converter to supply a constant current without loss by a switching control signal applied from the detection adjusting unit; The charging / discharging battery charging apparatus of claim 2, wherein the switching result signal of the second transistor comprises a first resistor configured to apply the first transistor to the first transistor of the DC converter. The method of claim 1, wherein the constant voltage unit, And a third transistor controlled by the constant current unit to supply the constant voltage to the DC converter by a linear control signal applied from the detection adjusting unit. Determining whether the battery is charged by the charging / discharging battery charger; If it is determined that the battery is charged in the above process, the second process of switching the constant current charging method; A third process of determining whether the battery is fully charged in the process; The charging / discharging battery charging method of claim 4, wherein the charging / discharging battery is characterized in that it comprises a fourth step of charging the linear voltage constant voltage when judged in the above process. The method of claim 7, wherein the second process, A control signal for turning on the constant voltage unit is output by the control unit, And a switching control signal is output to the constant current unit when the voltage difference detected between the second resistor is large. The method of claim 7, wherein the fourth process, A control signal for turning on the constant current unit is output by the control unit, And detecting the voltage between the contact point of the second resistor and the battery unit and outputting the constant voltage unit linear control signal when the voltage is higher than or equal to a predetermined voltage.