CN1801570A - System power supply providing equipment using battery charger - Google Patents

Abstract

The electric power supply device with cell charger comprises: a charge voltage control part to adjust power from ac adapter fit to proper cell voltage, a dc/dc frequency converter to transform said power into system power for supply, and a charge current control part to adjust and send said output charge current of voltage control part to cell. This invention reduces voltage to input system, and simplifies device.

Description

Utilize the system power supply of battery charger that equipment is provided

(1) technical field

The present invention utilizes the system power supply of battery charger that equipment is provided, and refers in particular to utilization and can make battery charge and system power supply provide the system power supply of the battery charger that has more validity that device-dependent invention is provided.

(2) background technology

The embodiment that Fig. 1 represents that the power supply of general AC adapter and battery supply are selected as system power supply and provides, such as, insert under the situation ofbattery 16 electronic instrument inside at notebook computer and so on, if directly connectAC adapter 10, the power supply that provides from above-mentioned interchange (AC)adapter 10 with regard to Be Controlledportion 13 through can open/close the 1st switch (SW1) 11, be transferred to DC-DC frequency converter 12, above-mentioned DC-DC (DC/DC)frequency converter 12 is this power conversion a DC-DC, provides as system power supply.

In addition, the power supplyprocess mains charger 15 from above-mentionedAC adapter 10 provides is transferred to above-mentionedbattery 16 as charge power supply, and therefore, the power supply that provides from above-mentionedAC adapter 10 provides simultaneously as system power supply and charge power supply of battery.But at this moment,, when above-mentionedcontrol part 13 is converted to closed condition to above-mentioned the1st switch 11 from opening, the 2nd switch is converted to opening from closed condition if the connection of above-mentionedAC adapter 10 is cancelled.

So, be transferred to the cut while of power supply of theAC adapter 10 of above-mentioned DC-DC frequency converter 12, be provided from alternative this power supply of the power supply of above-mentionedbattery 16 discharges, therefore, if above-mentioned AC adapter is cancelled connection, just can use battery supply as system power supply.

But the startup according to above-mentionedAC adapter 10 connects or the cancellation connection, if the power loss that switch motion causes just takes place for On/Off the1st switch 11 and the 2nd switch (SW2) 14.The power supply of the high voltage that above-mentioned DC-DC frequency converter 12 can be accepted provide from above-mentionedAC adapter 10 is provided, existing needs to use the problem with higher withstand voltage high price parts.

In addition, if the power supply of above-mentionedbattery charger 15 outputs directly is transferred tobattery 16 and DC-DC frequency converter 12, such as, during battery charge,, just there is the problem that electric current can not be provided to system fully according to the restriction of battery design electric current.Particularly, battery too discharges, and when causing making it to be in the low speed charged state, damages for preventing battery, and charging current is flowed on a small quantity, and therefore, undercurrent causes improper the stopping of system to be moved.

(3) summary of the invention

So, the present invention proposes for addressing the above problem, its purpose is to provide a kind of handle to provide as system power supply and battery supply by the power supply of battery charger transmission, when making equipment have more simplification, detect the output current value of battery status and AC adapter, the restriction and the grade of regulating cell charging current, providing to utilize to be intended to make system power supply to provide to move the system power supply of utilizing battery charger that has more validity with battery charge with this provides equipment.

To achieve these goals, the system power supply of battery charger of utilizing of the present invention provides equipment to comprise that following 3 parts constitute characteristics.One of them parts be for a power adjustment that provides by AC adapter for being fit to the charging voltage control part of cell voltage, also have one to be that a power source conversion of exporting through above-mentioned voltage control parts for handle is a system power supply, and the DC-DC frequency converter that provides, and, be transferred to the charging current control part of the charging current of battery for regulating through above-mentioned charging voltage control part output.

Effect of the present invention:

The system power supply of battery charger of utilizing of the present invention that more than constitutes and form provides equipment, on the electronic instrument as notebook and so on, when the power supply by battery charger output is provided as system power supply and charge power supply of battery respectively, detect the output current value of battery status and AC adapter, restriction and the grade of regulating the current charges electric current.This reduction is input to the voltage of system, be used in withstand voltage can the reduction of parts of power input, therefore, can realize the simplification of equipment, not only improve the efficient of the DC-DC frequency converter that aims to provide system power supply, and when battery discharge, also can normally provide system acting required necessary power supply, be a very necessary invention.

For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.

(4) description of drawings

Fig. 1 represents general AC adapter power supply and battery supply as system power supply, the selected and embodiment that provides.

Fig. 2 represents that the system power supply of battery charger of utilizing of the present invention provides equipment to constitute.

Fig. 3 represents that the system power supply of utilizing battery charger of the present invention provides the embodiment of equipment.

The symbol description of major part in the accompanying drawing:

10,30: ACadapter 11,14: switch

12,33: DC-DC frequency converter 13: control part

15: battery charger 16: battery

31: current detecting part 32: the charging voltage control part

34: charging current control part 35: the battery status test section

36: battery

(5) embodiment

Provide the system power supply of equipment utilization battery charger to provide apparatus embodiments to be elaborated to the system power supply of battery charger of utilizing of the present invention below with reference to accompanying drawings.

Fig. 2 represents that the system power supply of utilizing battery charger of the present invention provides the formation of equipment, such as, the notebook computer that the present invention is suitable for comprises that current detectingpart 31 and charging voltage control part 32, DC-DC frequency converter 33, chargingcurrent control part 34 and batterystatus test section 35 constitute.

In addition, the current value of the power supply that provides byAC adapter 30 is provided above-mentioned current detectingpart 31, and exports to above-mentioned chargingcurrent control part 34; Above-mentioned charging voltage control part 32 is adjusted to the supply voltage grade that provides by above-mentionedAC adapter 30 voltage that is fit to above-mentioned battery 36, as shown in Figure 3, above-mentioned charging voltage control part 32 constitutes with the DC-DC frequency converter of most circuit elements compositions.

In addition, above-mentioned chargingcurrent control part 34 transmits the power supply by above-mentioned charging voltage control part 32 outputs as charge power supply of battery, regulate the electric current of its charge power supply of battery.As shown in Figure 3, above-mentioned chargingcurrent control part 34 constitutes with flow restricter.Flow restricter is to detect according to above-mentioned batterystatus test section 35 and current detectingpart 31, and the signal of output, limits and regulate the current class of above-mentioned charge power supply.

At above-mentioned chargingcurrent control part 34,, just be restricted to the lower grade of charging current that is transferred to above-mentioned battery if be transferred to the current value of above-mentioned DC-DC frequency converter 33 and be transferred to the capacity of the current value of above-mentioned battery above above-mentionedAC adapter 30.

In addition, when above-mentioned batterystatus test section 35 detected the undue discharge condition of batteries 36, above-mentioned chargingcurrent control part 34 was restricted to the grade of charging current lower, makes charging current slowly be injected into battery; When above-mentioned batterystatus test section 35 detects the normal condition of battery 36,, charging current is normally provided being adjusted to normal value on the grade of charging current.

That is to say, above-mentioned chargingcurrent control part 34 is according to above-mentioned current detectingpart 31 and the output current value of batterystatus test section 35 each self-monitoring AC adapter and the present status of battery, the FET that the ON/OFF flow restricter comprises makes its suitably grade of regulating cell charging current with this.

So, give the power supply of above-mentioned DC-DC frequency converter 33 transmission high current grades, when making system's driven, give the power supply of the relatively low current class of above-mentioned battery 36 transmission, make battery charge action normally operation at leisure.

In addition, the supply voltage that is transferred to above-mentioned DC/DC adapter 33 is adjusted to consistent, can reduces with this and to be used for the withstand voltage of system power supply input parts, can realize the simplification of equipment with cell voltage.

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.

Claims (6)

1, a kind of system power supply of battery charger of utilizing provides equipment, it is characterized in that comprising as lower member:

For a power adjustment that provides by AC adapter is the charging voltage control part that is fit to cell voltage;

For a power conversion by above-mentioned voltage control parts output is a system power supply, and the DC-DC frequency converter that provides;

To export in order regulating, and to be transferred to the charging current control part of the charging current of battery by above-mentioned voltage control parts.

2, the system power supply of battery charger of utilizing as claimed in claim 1 provides equipment, it is characterized in that also comprising:

For current detecting part that the source current that provides by described AC adapter is provided with for detecting the battery status test section of described battery status.

3, the system power supply of battery charger of utilizing as claimed in claim 1 provides equipment, it is characterized in that also comprising:

Described DC-DC frequency converter is the power conversion that provides by above-mentioned AC adapter and is adjusted to the charging voltage that is fit to cell voltage.

4, the system power supply of battery charger of utilizing as claimed in claim 1 provides equipment, it is characterized in that also comprising:

Described charging current control part constitutes with flow restricter, and described flow restricter is to regulate by above-mentioned voltage control parts output, and is transferred to the charging current of battery.

5, the system power supply of battery charger of utilizing as claimed in claim 4 provides equipment, it is characterized in that also comprising:

Described charging current control part is the charging current that restriction is transferred to described battery, makes the current value that is transferred to described DC-DC inverter current value and is transferred to described battery can not surpass described AC adapter capacity.

6, the system power supply of battery charger of utilizing as claimed in claim 4 provides equipment, it is characterized in that also comprising:

Described charging current control part is restricted to the grade of charging current lower under the situation of the undue discharge of described battery; When described battery belongs to normal condition, normal the reduction of the grade of charging current.

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