CN1909321A - Charge and discharge circuit for electric battery - Google Patents
Charge and discharge circuit for electric battery Download PDFInfo
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- CN1909321A CN1909321A CN 200510028429 CN200510028429A CN1909321A CN 1909321 A CN1909321 A CN 1909321A CN 200510028429 CN200510028429 CN 200510028429 CN 200510028429 A CN200510028429 A CN 200510028429A CN 1909321 A CN1909321 A CN 1909321A
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Abstract
The invention relates to a discharge/charge circuit of battery group, which comprises: a battery using chemical or physical reaction or obtain direct-current power; the first protecting circuit for checking the voltages at two ends of battery; the second protecting circuit that operating when the first protective circuit can not check the voltages, and cutting off the fusion when the voltage is higher than the maximum voltage; a charge IC for adjusting the current flown into the battery when the input terminal of power source flows power into the adaptor, utile the charge reaches the stable standard; and a micro computer for checking the convert transistor whose one end is connected to the fusion and another electrode is connected to the input terminal of power, to control the system via standard of power. The invention will charge power to the charge terminal of host, when the battery is mounted.
Description
Technical field
The invention relates to the battery set charge/discharge circuit.Especially about after confirming whether battery pack to be installed, to the charging terminal supply power of main system, and the charge-discharge circuit of the battery pack that can protect battery pack.
Background technology
Generally speaking, portable digital video disk (Digital Video Disk; DVD) player all has one and can long-time continuous uses, and is flocked together and the battery pack formed by a plurality of batteries.
Now, the battery (Battery) of institute's operation technique is exactly to be provided with charge-discharge circuit in the inside of battery pack (Battery Pack) in the just extensively universal SONY bunch of Portable DVD player (Portable DVDPlayer) that uses in the whole world.
Certainly, though mobile phone or PDA are to use the charger of the charging device that has other.But on the aspect of design, its content all is a broadly similar.
In traditional technology, the terminal of battery pack (Battery Pack) is 3 terminals.Wherein, the specific control signal of discharge terminal and charge-discharge circuit inside is irrelevant, and it often makes battery (CELL) produce voltage.
In traditional technology, the terminal of battery pack (Battery Pack) exposes to the outside, and the specific control signal of it and charge-discharge circuit inside is irrelevant, and it often makes battery (CELL) produce voltage.Therefore, when metallicity material or conductive material and port (port) when contacting, phenomenon will be short-circuited.Like this, battery pack itself is suffered damage, or shortened the useful life of battery pack.
That is to say that in traditional technology, charge-discharge circuit is with that whether battery has been installed is irrelevant, no matter whether battery has been installed it all can be to the charging terminal supply power of main system.Therefore, even the output voltage of battery is 0 volt, charging phenomenon also may take place in battery.Here it is according to the structure of the charge-discharge circuit of conventional art.
Therefore, for the charge-discharge circuit of foundation conventional art, even under the state that battery is not installed, it also can be to the main system supply power.Like this, under the state that battery is not installed, metallicity material or conductive material will often take place with the phenomenon that port (port) contacts.
As mentioned above, in this case, phenomenon will be short-circuited.Like this, battery pack itself is suffered damage, or shortened the useful life of battery pack.This is its existing problem.
Summary of the invention
The present invention proposes for the problem that the charge-discharge circuit that solves above-mentioned battery according to conventional art produces.The object of the present invention is to provide a kind of charge-discharge circuit of battery pack, promptly after confirming whether battery to be installed, again to the charging terminal supply power of main system.Simultaneously, can protect battery pack.The present invention is exactly the charge-discharge circuit about a kind of like this battery pack.
To achieve these goals, has the feature that constitutes by following components according to the charge-discharge circuit of battery pack of the present invention: utilize reaction chemistry or physics and obtain the cell apparatus of DC power supply; 1 protective circuit that voltage between the two ends of described cell apparatus is detected; Under the situation that described 1 protective circuit can not detect the voltage between the described cell apparatus two ends, just start working, when detect between the described cell apparatus two ends occur than the also big voltage condition of the maximum voltage of cell apparatus under, just with 2 protective circuits of fuse cut-out; If flow into power supply to adapter, then will regulate, and charge to it and to reach the charging IC of stable standard up to voltage to the electric current that battery flows into from the input terminal of power supply; One of electrode is connected with a side terminal of described fuse, and the other end electrode detects with the conversioning transistor that described power input terminal is connected, the microcomputer of controlling according to the standard of the battery supply of above-mentioned detection and to system.
Like this, just can guarantee only just can be to the charging terminal supply power of main system under the situation that battery is installed.Therefore, this is a very useful invention.
Here; also have following feature according to the charge-discharge circuit of battery pack of the present invention: described by battery discharge voltage the situation whether described cell apparatus has been installed is detected after; carry out the over-discharge can defencive function; and make discharge voltage with 0 volt of output; in this case; for output voltage or prevention current flowing, and between cell apparatus and P-terminal, be set up in parallel the 1st, the 2 capacitor with conversioning transistor by the positive and negative end of described cell apparatus.
In addition, also have following feature according to the charge-discharge circuit of battery pack of the present invention: promptly it also comprises following components: discharge output DO (DischargeOutput) terminal of 1 protective circuit that will be connected in series mutually is connected with the gateway, and the discharge conversioning transistor (D-FET) that a tip electrode is connected with cell apparatus; The charging of 1 protective circuit output CO (Charge Output) terminal is connected with the gateway, and the charging conversioning transistor (C-FET) that the other end electrode is connected with (P-) terminal.
Effect of the present invention:
As mentioned above, the charge-discharge circuit according to battery pack of the present invention has following good result.
In the foundation embodiments of the invention, no matter whether system has installed battery, the situation according to the power supply of supplying with to the charging terminal of main system even the output voltage of battery pack is 0V, also can stop battery pack to be charged.Like this, just can effectively prevent by foreign matters such as metallicity material or conductive materials and the generation of the short circuit phenomenon that causes, thereby just can play the protective effect of system.
Can also prolong the useful life of battery pack according to embodiments of the invention, and improve the confidence level of its use.Therefore, it has very good effect.
In addition, the present invention is not only applicable to portable DVD player, it but also be applicable to that notebook PC, PCS, PDA etc. use the product of batteries.Like this, just improved the possibility that product is suitable for.This point, on the aspect of consumer's fail safe, it is very favorable.Therefore, it has had another good effect.
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.
Description of drawings
Fig. 1 is the pie graph of expression according to battery discharging circuit of the present invention.
Fig. 2 is the pie graph of expression according to the charge-discharge circuit of battery pack of the present invention.
Fig. 3 is the pie graph of representing the control circuit of controlling according to the charge-discharge circuit of battery pack of the present invention.
The symbol description of major part in the accompanying drawing:
21,22,1 protective circuits of battery
23,2 protective circuits 24, fuse unit
25, charging IC 26, microcomputer
Embodiment
Below, the embodiment to the charge-discharge circuit of battery pack of the present invention is described in detail with reference to the accompanying drawings.
Fig. 1 is the pie graph of expression according to battery discharging circuit of the present invention.Fig. 2 is the pie graph of expression according to the charge-discharge circuit of battery pack of the present invention.
According to embodiments of the invention, for the charge-discharge circuit of battery pack, the charge-discharge circuit of battery pack inside is connected with battery.Like this, a battery maximum (Max) can produce 4.2 volts voltage.Battery pack is connected with device (Set), in the time of the battery discharge in the battery pack, if cell voltage drops to fiducial value.That is to say if in the time of the battery discharge in the battery pack; if cell voltage drops to below the 2.3V; the protection power supply that is arranged on charge-discharge circuit inside will be started working, thereby can stop cell voltage to continue to produce discharge (output current) again.
In addition, when installing (Set) when being connected with battery pack, system just can charge by adapter (Adaptor).Like this, if battery (being connected with the discharge terminal) does not produce voltage.So, main system (Main System) will be exported control signal, stops voltage to produce.Like this, charging process just can not be carried out.
That is to say that no matter whether system has installed battery, battery pack all can be to the charging terminal supply power of main system.Like this, even the output voltage of battery pack is 0V, battery pack also can be charged.For the battery pack that prevents to have this structure under situation about not being mounted, by foreign matter etc. and the generation of the short circuit phenomenon that causes.Just need be after confirming whether battery to be installed, again to the charging terminal supply power of main system.The present invention is exactly a kind of system configuration with this function.
As mentioned above, the formation of the discharge circuit of foundation battery pack of the present invention as shown in Figure 1, it is made of following components: i.e. 2 on battery can exporting 4.2 volts voltage by maximum (MAX) connect (serial), and each battery respectively has 3 batteries to carry out parallel connection (parallel) and forms in these 2 batteries, then, utilize reaction chemistry or physics and obtain the cell apparatus 11 of DC power supply; 1 protective circuit 12 (S-8232ACFT) that voltage between cell apparatus 11 two ends is detected; When above-mentioned 1 protective circuit 12 can not detect the voltage between the battery two ends, just start working, and 2 protective circuits 13 (S-8244) that the voltage between cell apparatus 11 two ends is detected.
In Fig. 1 14 are expression batteries when charging, under the moving situation of excessive voltage source and be in the fuse 14 (SFD-125) of open mode.
As mentioned above; for discharge circuit with above-mentioned formation; after battery discharge is put into low-voltage (Low Voltage) standard; if with its long-time placement; the protective circuit (Over Discharge Protection) that is arranged on battery pack inside is just started working and is carried out its defencive function, and makes D-FET close (off).Like this, just can make the discharge voltage of battery pack reach 0V.
As shown in Figure 2, overall structure according to the charge-discharge circuit of battery pack of the present invention is made of following components: promptly 2 on battery can exporting 4.2 volts voltage by maximum (MAX) is connected (serial), and each battery respectively has 3 to carry out parallel connection (parallel) and form in these 2 batteries.Then, utilize reaction chemistry or physics and obtain the cell apparatus 21 of DC power supply; 1 protective circuit 22 that voltage between cell apparatus 21 two ends is detected; When above-mentioned 1 protective circuit 22 (S-8232ACFT) can not detect the voltage between cell apparatus 21 two ends, just start working, and 2 protective circuits 23 (S-8244) that the voltage between cell apparatus 21 two ends is detected; When cell apparatus 21 charges, under the situation that excess voltage flows and be in the fuse 24 (SFD-125) of open mode; Be connected with a tip electrode with a side terminal, and the gateway of the FET that the other end electrode is connected with supply voltage input terminal (Vin) is connected, and the voltage of input is discerned fuse 24.Then, the power supply of cell apparatus 21 is detected, and the microcomputer 26 that FET is regulated; If the input terminal of power supply (Vin) is to the power supply of adapter inflow 10V, above-mentioned microcomputer 26 is just discerned input voltage.Then, cell apparatus 21 power supplys are detected.Like this, the electric current of subtend cell apparatus 21 injections is regulated.Then, charge to cell apparatus 21 and reach the charging IC25 that the stable state standard is 8.4V (MB 3887) up to cell apparatus 21 voltages.
In addition; with the tip electrode that the discharge of above-mentioned 1 protective circuit 22 output DO (Discharge Output) terminal is connected with the gateway, the discharge conversioning transistor (D-FET) that is connected with cell apparatus 21 and charging conversioning transistor (C-FET) one-tenth that charging output CO (Charge Output) terminal with 1 protective circuit 22 is connected with the gateway connection status of connecting.C-FET is by thermal cut-out device (ThermalBreaker; TB1) (IP505B) be connected with other end electrode (P-) terminal.
In addition, (P+) terminal is connected with fuse 24, and the 1st, the 2 capacitor C21/C22 that D-FET and C-FET are connected side by side is connected with (P-) terminal with cell apparatus 21.
Here, after the over-discharge can defencive function of carrying out battery pack inside, if D-FET closes (off).So, output (discharge) voltage is just exported with 0V.Like this, even in this case, also C21/C22 can be provided with according to 100kohm in order to make the battery pack output voltage.
Like this, can hold and output voltage by (+) (-) of battery pack, and electric current is connected according to 100kohm.This just means that electric current almost can not circulate.Electric current almost can not circulate owing to exported voltage.Therefore, even causing under the situation of short circuit that by foreign matter (conductive material) any problem can not appear in battery pack yet, this is the advantage that it has.
In addition; the protective device that overcharges of 1 protective circuit 22 (Over Charge Prevention); over-discharge can protection (Over Discharge Prevention) device, the course of work of over-discharge can current protective device (Over Discharge Current Prevention) is as follows:
At first; for the protective device that overcharges (Over Charge Prevention); voltage between the cell apparatus two ends is detected; under the situation that detects maximum battery voltage (Max Cell Voltage) 〉=4.35V ± 0.025V; C-FET just closes (off), thus the generation of the phenomenon that just can prevent to overcharge.(Recovery?Vcell＜4.15V±0.05V)
In addition; for over-discharge can protective device (Over Discharge Prevention); voltage between the cell apparatus two ends is detected; under the situation that detects minimum cell voltage (Min Cell Voltage)≤2.30V ± 0.08V; D-FET just closes (off), thereby just can prevent the generation of over-discharge can phenomenon.
In addition, over-discharge can current protective device (Over Discharge Current Prevention) is under the situation of 5～10A when discharging current, and D-FET just closes (off), thereby just can prevent the generation of over-discharge can electric current.
In addition; the protective device that overcharges (Over ChargePrevention) for 2 protective circuits 23; under the situation of maximum battery voltage (Max Cell Voltage) 〉=4.45V ± 0.05V; SCP (Self Control Protector) fuse 24 will be opened, thus the generation of the phenomenon that just can prevent to overcharge.
In addition, in the embodiment of foundation conventional art, no matter whether battery has been installed, battery all can be to the charging terminal supply power of main system.Like this, even the output voltage of battery pack is 0V, battery pack also can be charged.In order to prevent the generation of short circuit in this case (short-circuit conditions that when battery pack is not installed, causes) phenomenon by foreign matter, in the foundation embodiments of the invention, the charging and discharging circuit of battery pack is after confirming whether battery to be installed, just to the charging terminal supply power of main system.Therefore, here, the situation whether battery has been installed can detect by battery power discharge voltage.
That is to say that after execution was arranged on the defencive function that overcharges of battery pack inside, D-FET will close (off).Like this, when the output voltage of battery pack is under the situation of 0V, main system just can not detect the installation situation of battery pack, like this, just makes charging not carry out, thereby can play the protective effect to system.
As mentioned above, being constructed as follows according to the control signal loop that the charge-discharge circuit of battery pack is controlled of the present invention.
Fig. 3 is the pie graph of representing the control circuit of controlling according to the charge-discharge circuit of battery pack of the present invention.
The formation situation that in Fig. 3, has shown the control signal loop when main system is exported charging voltage by battery pack, for (P+) terminal is connected with the gateway, one tip electrode is connected with (P-) terminal with earth terminal, the transistor Q120 that the other end electrode is connected with power supply voltage terminal (E+5V) by resistance, when the voltage of battery pack is the limiting voltage (Threshold Voltage) of transistor Q120, when promptly about 2V was above, system just can detect the installation situation of battery.Then, transistor Q120 will open.
In addition, close under the situation of (off) when main system is in, two terminals of non-conjunction (NAND) gateway IC171 will to " height " (HIGH) signal of standard discern.At this moment, the output of NAND gateway IC171 just be " low " (LOW).Then, system will make charging oxide-semiconductor control transistors (ChargeControl FET) Q115 open, and to the charging terminal supply power, thereby just can charge.
In addition, open under (on) situation when main system, two terminals of NAND gateway IC171 will be discerned the signal of HIGH and LOW standard respectively.At this moment, the output of NAND gateway IC171 is HIGH just.Then, system will make charging oxide-semiconductor control transistors (Charge Control FET) Q115 close, and the power supply of supplying with to charging terminal will be cut off, so that charging can not carry out, thereby just can play the protective effect of system.
As mentioned above, for foundation battery set charge/discharge circuit of the present invention, no matter it is the what state for the control signal of the discharge terminal charge-discharge circuit inside in the terminal that solves battery pack, when all often making battery produce voltage and the variety of issue that occurs is researched and developed.The terminal of battery pack exposes to the outside, so just can effectively prevent by foreign matters such as metallicity material or conductive materials and the generation of the short circuit phenomenon that causes.
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 (7)
1, a kind of charge-discharge circuit of battery pack is characterized in that being made of following components:
Utilize reaction chemistry or physics and obtain the cell apparatus of DC power supply;
1 protective circuit that voltage between the two ends of described cell apparatus is detected;
Under the situation that described 1 protective circuit can not detect the voltage between the described cell apparatus two ends, just start working, when detect between the described cell apparatus two ends occur than the also big voltage condition of the maximum voltage of cell apparatus under, just with 2 protective circuits of fuse cut-out;
If flow into power supply to adapter, then will regulate, and charge to it and to reach the charging IC of stable standard up to voltage to the electric current that battery flows into from the input terminal of power supply;
One of electrode is connected with a side terminal of described fuse, and the other end electrode detects with the conversioning transistor that described power input terminal is connected, the microcomputer of controlling according to the standard of the battery supply of above-mentioned detection and to system.
2, as the charge-discharge circuit of the described battery pack of claim-1, it is characterized in that:
The situation whether described cell apparatus is installed can detect by battery discharge voltage.
3, the charge-discharge circuit of battery pack as claimed in claim 1 is characterized in that:
Described by battery discharge voltage the situation whether described cell apparatus has been installed is detected after; carry out the over-discharge can defencive function; and make discharge voltage with 0 volt of output; in this case; for output voltage or prevention current flowing by the positive and negative end of described cell apparatus; and between cell apparatus and P-terminal, be set up in parallel the 1st, the 2 capacitor with conversioning transistor.
4, the charge-discharge circuit of battery pack as claimed in claim 1 is characterized in that also comprising following components:
The discharge output DO terminal of 1 protective circuit being connected in series mutually is connected with the gateway, and the discharge conversioning transistor D-FET that a tip electrode is connected with described cell apparatus;
The charging of described 1 protective circuit output CO terminal is connected with the gateway, and the charging conversioning transistor C-FET that the other end electrode is connected with the P-terminal.
5, the charge-discharge circuit of battery pack as claimed in claim 4 is characterized in that:
Described 1 protective circuit detects the voltage between the described cell apparatus two ends; under the situation that detects maximum battery voltage 〉=4.35V ± 0.025V; described charging conversioning transistor C-FET just closes; so just can prevent the generation of phenomenon that overcharges, thereby just can play protective effect system.
6, the charge-discharge circuit of battery pack as claimed in claim 4 is characterized in that:
Described 1 protective circuit detects the voltage between the described cell apparatus two ends, and under the situation that detects minimum cell voltage≤2.30V ± 0.08V, described charging conversioning transistor D-FET just closes, to prevent the generation of over-discharge can phenomenon.
7, the charge-discharge circuit of battery pack as claimed in claim 1 is characterized in that:
Described under the situation of maximum battery voltage 〉=4.45V ± 0.05V, described 2 protective circuits will make described fuse open, with the generation of the phenomenon that prevents to overcharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510028429 CN1909321A (en) | 2005-08-03 | 2005-08-03 | Charge and discharge circuit for electric battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510028429 CN1909321A (en) | 2005-08-03 | 2005-08-03 | Charge and discharge circuit for electric battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1909321A true CN1909321A (en) | 2007-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510028429 Pending CN1909321A (en) | 2005-08-03 | 2005-08-03 | Charge and discharge circuit for electric battery |
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| CN (1) | CN1909321A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809121A (en) * | 2016-09-05 | 2018-03-16 | 星电株式会社 | Supply unit |
| WO2021077309A1 (en) * | 2019-10-22 | 2021-04-29 | Neutron Holdings, Inc. | Auxiliary controller for controlling battery assembly |
-
2005
- 2005-08-03 CN CN 200510028429 patent/CN1909321A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809121A (en) * | 2016-09-05 | 2018-03-16 | 星电株式会社 | Supply unit |
| CN107809121B (en) * | 2016-09-05 | 2022-12-30 | 星电株式会社 | Power supply device |
| WO2021077309A1 (en) * | 2019-10-22 | 2021-04-29 | Neutron Holdings, Inc. | Auxiliary controller for controlling battery assembly |
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