CN2415529Y - Electric power controlling unit with spare cell of photocell - Google Patents
Electric power controlling unit with spare cell of photocell Download PDFInfo
- Publication number
- CN2415529Y CN2415529Y CN 00201513 CN00201513U CN2415529Y CN 2415529 Y CN2415529 Y CN 2415529Y CN 00201513 CN00201513 CN 00201513 CN 00201513 U CN00201513 U CN 00201513U CN 2415529 Y CN2415529 Y CN 2415529Y
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- Prior art keywords
- reserve battery
- photocell
- power source
- voltage
- external power
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Abstract
The utility model discloses an electric power control device of standby battery provided with photocell, being suitable for the standby battery of a load system such as notebook computers. The utility model comprises a charging circuit of external power supply and a charging circuit of photocell. The charging circuit of external power supply is used for charging up the standby battery until preset degree is achieved; the charging circuit of photocell is coupled and connected with the standby battery. The charging circuit of photocell is provided with a photocell which can charge up the standby battery when the standby battery is lost to preset electric power, so as to maintain the electric power of the standby battery.
Description
The utility model is relevant for a kind of reserve battery power control unit, particularly relevant for having photocell (solar cell, or title solar cell) reserve battery power control unit, can be at reserve battery because under the situation of long-term storage or other environmental factors and loss, automatically utilize photocell to replenish the electric power that runs off, so that keep the power capacity of reserve battery at any time.
In general notebook computer or other portable electronic equipments, supply of electric power can by the DC power supply (mostly being to be produced by the electric main conversion) of outside or internal cell be provided.In addition, a reserve battery is installed additional in big city in the notebook computer, its capacity is much smaller than the capacity of main battery and only can keep normal running about several minutes, so that when externally DC power supply and inner main battery all can't provide electric power, allow the user have time enough to store important data down, to keep the correctness of data.
Generally speaking, external power source also is responsible for main battery and reserve battery are charged except the supply of being responsible for notebook computer electric power simultaneously.In case external power source is stopped power supply, main battery can be accepted down the work that continues power supply immediately.If when main battery power drain or quilt were chosen, reserve battery can be taken over last powered operation, though the time is very short, enough general user is preserved needed data.Yet reserve battery had its shortcoming in running in the past.
At first, as previously mentioned, reserve battery is to finish charging by external power source, mostly is to carry out in the mode of trickle charge.This mode is very easy to allow reserve battery be in state in the charging always, so can quicken the aging of battery.On the other hand, in real urgent need will be charged the situation of reserve battery, above-mentioned charging modes was also too slow significantly.
In addition, if notebook computer is to utilize the mode of changing main battery to operate always, this expression reserve battery can not replenish electric power in this operating period.So because do not use for a long time or during environmental impact loss electric power, the stored electric power of reserve battery will descend always, this makes real in the situation that needs reserve battery electric power, can't reach its function on the contrary when reserve battery.Just because of reserve battery has these characteristics in operation, so need to propose a kind of effective solution of the above problems.
In view of this, main purpose of the present utility model, be to propose a kind of reserve battery power control unit, particularly comprise and have the photocell of charge characteristic at any time, make reserve battery utilizing external power source to carry out reaching apace under the charge condition purpose of charging, and can utilize photronic characteristic, keep the electric power of reserve battery at any time, so that solve the operational defective of reserve battery in the past.
According to above-mentioned purpose, the utility model proposes a kind of photronic reserve battery power control unit that has, reserve battery applicable to a load system (for example notebook computer), it comprises two parts, one is the external power source charging circuit, is coupled between external power source and the reserve battery, in order to reserve battery is charged, and when reserve battery charges to a predetermined extent, stop external power source and continue reserve battery is charged; Another is the photocell charging circuit, is coupled to reserve battery, and this photocell charging circuit has a photocell, can be after reserve battery be lost to a predetermined power, reserve battery is carried out the action of boost charge, and use and keep its electric power.
The said external power charging circuit then comprises a comparator and a switch element.Comparator is coupled between a reserve battery and the reference voltage, in order to comparison one comparative voltage and reference voltage corresponding to the external voltage of reserve battery, and produces an index signal.Wherein, reference voltage can be produced by a pressurizer, and this pressurizer receives external power source and produces this reference voltage, and comparative voltage is then produced by a bleeder circuit, and this bleeder circuit produces this comparative voltage according to the external voltage dividing potential drop of reserve battery.The setting state mode of index signal is as follows: when index signal was first state, the expression comparative voltage was lower than reference voltage, and when index signal was second state, the expression comparative voltage was higher than reference voltage.Switch element then is controlled by index signal, is used for controlling the connection between external power source and the reserve battery.When index signal was first state, switch element was connected external power source and reserve battery, and when index signal was second state, switch element then can not connected external power source and reserve battery.By this, the electric power of being supplied by external power source can stop when reserve battery reaches sufficient state automatically.
In addition, also comprise a diode in the photocell charging circuit, its anode is coupled to photocell, and negative electrode is coupled to reserve battery, so when the external voltage of reserve battery is lower than the external voltage of photocell, just can utilize photocell that reserve battery is charged, reach the purpose of replenishing electric power.
According to the above, but advantage division of the present utility model is as follows:
1. because reserve battery can utilize external power source to charge fast, so can shorten the whole charging interval.
2. owing to utilize photocell to keep the electric power of reserve battery, therefore can not have to keep the electric power of reserve battery at any time under the situation of external power source, can also reach the prolongation battery purpose in useful life by this.
For above-mentioned purpose of the present utility model, characteristic and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. elaborate.
Fig. 1 represents the reserve battery power control unit among the utility model embodiment and the detailed circuit diagram of each power source power supply circuits.
Wherein:
1～load; 2～main battery; 4～reserve battery; 6～photocell; 7～external power source charging circuit; 8～photocell charging circuit; 10～Voltagre regulator; 12～charging circuit; 13～power transistor; 14～operational amplifier.
Embodiment:
Fig. 1 represents the detailed circuit diagram of the power supply circuits of reserve battery power control unit in the present embodiment and each power source (for example external power, main battery and reserve battery etc.).Before explanation reserve battery power control unit, the supply power mode of each power source and the priority of powering at first are described therebetween.
In Fig. 1, VDC (with respect to earth terminal GND) represents external power source, 2 expression main batterys, and 4 expression reserve batteries, these three kinds of different power sources are under different situations load 1 to be powered, load 1 can be notebook computer or other electronic installations.In the ordinary course of things, suppose that main battery 2 and the reserve battery 4 external voltage (terminal voltage) (generally also near its maximum output voltage) when full charge is V
Main batteryAnd V
Reserve battery, then the magnitude of voltage relation can be expressed as between external power source VDC, main battery 2 and the reserve battery 4:
V
VDC＞V
Main battery＞V
Reserve battery
In Fig. 1, charging circuit 12 and diode D2-D5 are used for controlling these three kinds of power supplys in which kind of situation load 1 to be powered respectively in addition.Its action below promptly is described.
When external power source VDC existed, diode D2 meeting conducting was so external power source VDC has the status of preferential power supply.At this moment, because main battery 2 and reserve battery 4 complete sufficient electric power whether no matter, voltage V5 (near the output voltage of external power source VDC) can be greater than the external voltage of main battery 2 and reserve battery 4, so D4 and D5 can conductings.On the other hand, charging circuit 12 also can produce a rechargeable battery conducting diode D3 behind input external power source VDC, main battery 2 is charged.Therefore, when external power source VDC exists, Yi Bian can power to load 1, Yi Bian then can charge to main battery 2.
When external power source VDC does not insert and main battery 2 when existing, diode D2 can conducting and diode D4 can conducting, so main battery 2 is the power supply source of second order.At this moment, voltage V5 (near the external voltage of main battery 2) can be greater than the external voltage of reserve battery 4, so diode D5 can conducting.In addition, because having the characteristic of unidirectional conducting, diode D2 and D3 be not on-state simultaneously at this moment, so can stop main battery 2 by other paths (back is described in detail) reserve battery 4 to be charged in the case, the situation of this shortage efficient of battery charge be taken place to prevent battery.
When external power source VDC and main battery 2 did not exist, reserve battery 4 can be used to be responsible for the power supply of short time internal burden 1.At this moment, diode D5 is conducting, and diode D2, D3, D4 are not on-state.Similarly, Ci Shi diode D2 and D4 can be used for preventing that reserve battery 4 charges to main battery 2 by other paths.
With next be the explanation reserve battery 4 power control unit.As shown in Figure 1, power control unit mainly comprises two parts, is respectively external power source charging circuit 7 and photocell charging circuit 8.External power source charging circuit 7 is coupled between external power source VDC and the reserve battery 4, is responsible for utilizing external power source VDC to come reserve battery 4 is charged fast.When reserve battery 4 charges to a certain predetermined extent, will stop external power source VDC reserve battery 4 is continued charging.8 of photocell charging circuits are coupled to reserve battery 4, utilize inner photocell, after the electric power of reserve battery 4 is reduced to certain predetermined extent, reserve battery 4 are carried out boost charge, so that keep its electric power.Below respectively with regard to above-mentioned two circuit, describe in detail its form with and action.
External power source charging circuit 7 comprises following several parts: Voltagre regulator 10 (its output 5V reference voltage), comparison circuit (being made of resistor R 1, resistor R 2, operational amplifier 14) and switching circuit (being made of resistor R 3, resistor R 4, resistor R 5, power transistor 13 and diode D1).
Whole comparison circuit then is to be used for comparative voltage V2 and the reference voltage (5V) that comparison produced by reserve battery 4 external voltage V1.Comparative voltage V2 is the bleeder circuit that utilizes resistor R 1 and resistor R 2 to be constituted, and dividing potential drop reserve battery 2 external voltage V1 produce.Therefore, comparative voltage V2 is proportional to external voltage V1.As shown in the figure, 5V reference voltage and comparative voltage V2 are delivered to the inverting input (-) and the in-phase input end (+) of operational amplifier 14 respectively, according to relation between the two, and the instructed voltage V3 of operational amplifier 14 output corresponding statess.When comparative voltage V2 was lower than reference voltage 5V, instructed voltage V3 was the state of low level (0V), and this electric power of representing present reserve battery 4 is insufficient fully as yet.When comparative voltage V2 was higher than reference voltage 5V, instructed voltage V3 was the state of high level (5V), and this electric power of representing present reserve battery 4 has reached above-mentioned predetermined extent.According to the state of instructed voltage V3, switching circuit can be controlled the charge path on off state of external power source VDC to reserve battery 4.
In switching circuit, power transistor 13 is as main switch element, is a P transistor npn npn in the present embodiment.As shown in the figure, the source/drain electrode of power transistor 13 is to be coupled to external power source VDC (by diode D1) and reserve battery 4 (by resistor R 5), and its grid then is controlled by instructed voltage V3.When instructed voltage V3 was low level state, expression reserve battery 4 still needed to continue charging, so power transistor 13 is conducting (ON) state, allowed external power source VDC continue reserve battery 4 is charged.When instructed voltage V3 was high level state, expression reserve battery 4 had been charged to a predetermined extent, so power transistor 13 is cut-off state, stopped external power source VDC and continued reserve battery 4 is charged.By this, reserve battery 4 can charge to a certain degree apace, then then stops to continue charging from external power source VDC.
After externally power vd C finished its charging action, follow-up boost charge action then was to be responsible for by photocell charging circuit 8.As shown in the figure, comprise photocell 6, diode D6 and resistor R 6 in the photocell charging circuit 8.Photocell 6 is to be used for reserve battery 4 is replenished electric power source, because it can operate in the occasion of enough light is arranged, therefore present embodiment can be avoided because do not use external power source VDC for a long time, and makes reserve battery 4 cause the phenomenon of power consumption because of the self discharge effect.In addition, diode D6 is the charging direction that is used for controlling 6 pairs of reserve batteries 4 of photocell, only be higher than the situation of reserve battery 4 external voltage V1 (this voltage may descend because of the self discharge effect) simultaneously, charge by photocell 6 at the external voltage of photocell 6.
Though the utility model has been done announcement as mentioned above with a preferred embodiment; but this embodiment is not in order to limit the utility model; any those skilled in the art; in spirit and scope of the present utility model; can make many changes and modification, so the utility model protection range is as the criterion with accompanying claims institute restricted portion.
Claims (5)
1. one kind has photronic reserve battery power control unit, and on the reserve battery applicable to a load system, this load system by an external power source, is characterized in that under normal operation this reserve battery power control unit comprises:
The external power source charging circuit, be coupled between described external power source and the described reserve battery, in order to described reserve battery is charged, and when described reserve battery charges to a predetermined extent, then stop described external power source and continue charging for described reserve battery; And
The photocell charging circuit is coupled to described reserve battery, and described photocell charging circuit has a photocell, after being lost to a predetermined power at described reserve battery, described reserve battery is carried out boost charge.
2. reserve battery power control unit as claimed in claim 1 is characterized in that, described external power source charging circuit comprises:
Comparator, be coupled between a described reserve battery and the reference voltage, in order to compare a comparative voltage and a described reference voltage corresponding to the external voltage of described reserve battery, and produce an index signal, when described index signal is first state, represent that described comparative voltage is lower than described reference voltage, when described index signal is second state, represent that described comparative voltage is higher than described reference voltage; And
Switch element, be controlled by described index signal, in order to control being connected of described external power source and described reserve battery, when described index signal is first state, described switch element is connected described external power source and described reserve battery, when described index signal was second state, described switch element disconnected described external power source and described reserve battery.
3. reserve battery power control unit as claimed in claim 2 is characterized in that described reference voltage is produced by a pressurizer, and described pressurizer receives described external power source and produces described reference voltage.
4. reserve battery power control unit as claimed in claim 2 is characterized in that described comparative voltage is produced by a bleeder circuit, and described bleeder circuit is according to the external voltage of described reserve battery, and dividing potential drop produces described comparative voltage.
5. reserve battery power control unit as claimed in claim 1, it is characterized in that, described photocell charging circuit also comprises a diode, its anode couples described photocell, its negative electrode couples described reserve battery, in order to when the external voltage of described reserve battery is lower than the external voltage of described photocell, utilize described photocell that described reserve battery is charged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00201513 CN2415529Y (en) | 2000-01-07 | 2000-01-07 | Electric power controlling unit with spare cell of photocell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00201513 CN2415529Y (en) | 2000-01-07 | 2000-01-07 | Electric power controlling unit with spare cell of photocell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2415529Y true CN2415529Y (en) | 2001-01-17 |
Family
ID=33570767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00201513 Expired - Lifetime CN2415529Y (en) | 2000-01-07 | 2000-01-07 | Electric power controlling unit with spare cell of photocell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2415529Y (en) |
-
2000
- 2000-01-07 CN CN 00201513 patent/CN2415529Y/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |