CN201204479Y - Control integrated circuit for lithium battery charger and electrification indication control circuit thereof - Google Patents
Control integrated circuit for lithium battery charger and electrification indication control circuit thereof Download PDFInfo
- Publication number
- CN201204479Y CN201204479Y CNU2008200489291U CN200820048929U CN201204479Y CN 201204479 Y CN201204479 Y CN 201204479Y CN U2008200489291 U CNU2008200489291 U CN U2008200489291U CN 200820048929 U CN200820048929 U CN 200820048929U CN 201204479 Y CN201204479 Y CN 201204479Y
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- charging
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Abstract
The utility model discloses a lithium battery charger control integrated circuit avoiding error motion of charging indication and a charging indication control circuit thereof. The charging indication control circuit of the utility model comprises a power source input end (VDD), a grounded end, a voltage dividing end (T) and a voltage comparator (OP2), a resistor (R27) is connected between the power source input end (VDD) and the voltage dividing end (T), two groups of resistors (R28, R29, R30) interconnected in parallel are between the voltage dividing end (T) and the grounded end, resistance values of the resistors are equivalent, an inverse input end (IN-) of the voltage comparator (OP2) is connected with the voltage dividing end (T), the voltage of an in-phase input end (IN+) is connected with a reference voltage, an output end (OUT) is connected with a charging indicator lamp circuit; once the lithium is placed into the charger and the power source input end (VDD) has not been switched on, the voltage of the in-phase input end (IN+) is larger than that of the inverse input end (IN-), the output end (OUT) outputs high level and the charging indicator lamp is turned off; otherwise, the charging indicator lamp is turned on.
Description
Technical field
The utility model relates to a kind of lithium battery charger controlled integrated circuit and charging indication control circuit thereof.
Background technology
Generally use rechargeable lithium ion battery as power supply at present on electronic products such as mobile phone, this lithium ion battery need adopt charger to charge.Lithium battery charger mostly adopts various special-purpose control integrated circuit (IC) and various sample circuit at present.In adopting the lithium cell charging control circuit of P-MOSFET as control valve, because there is the reason of parasitic diode in P-MOSFET itself, can produce ghost effect, make power input VDD formerly load onto to be recharged battery and when not switching on, cell voltage can be added on the power input VDD by parasitic diode, make the work of IC internal circuit, make charging indicator light glimmer.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, and a kind of charging indication control circuit of lithium battery charger controlled integrated circuit of the indication misoperation of avoiding charging is provided.
In addition, the utility model also provides a kind of lithium battery charger controlled integrated circuit that adopts this charging indication control circuit.
The charging indication technical scheme that control circuit adopted of the utility model lithium battery charger controlled integrated circuit is: the charging indication control circuit of the utility model lithium battery charger controlled integrated circuit comprises power input, earth terminal, divide pressure side, voltage comparator, described power input and be connected to a resistance in described minute between the pressure side, be connected to two groups of resistance that are connected parallel with one another between described minute pressure side and the described earth terminal, the resistance value of each described resistance equates that all the inverting input of described voltage comparator is connected with described minute pressure side, the voltage of in-phase input end equals reference voltage, output is connected with charging indicator light circuit; When lithium battery is put into charger and described power input when not switching on, the voltage of described in-phase input end is greater than the voltage of described inverting input, described output output high level, and charging indicator light goes out; When the energising of described power input, the voltage of described inverting input is greater than the voltage of described in-phase input end, described output output low level, and charging indicator light is bright.
The technical scheme that the utility model lithium battery charger controlled integrated circuit is adopted is: the utility model lithium battery charger controlled integrated circuit comprises charging indication control circuit, described charging indication control circuit comprises power input, earth terminal, divide pressure side, voltage comparator, described power input and be connected to a resistance in described minute between the pressure side, be connected to two groups of resistance that are connected parallel with one another between described minute pressure side and the described earth terminal, the resistance value of each described resistance equates that all the inverting input of described voltage comparator is connected with described minute pressure side, the voltage of in-phase input end equals reference voltage, output is connected with charging indicator light circuit; When lithium battery is put into charger and described power input when not switching on, the voltage of described in-phase input end is greater than the voltage of described inverting input, described output output high level, and charging indicator light goes out; When the energising of described power input, the voltage of described inverting input is greater than the voltage of described in-phase input end, described output output low level, and charging indicator light is bright.
The beneficial effects of the utility model are: because charging described in the utility model indication control circuit comprises power input, earth terminal, branch pressure side, voltage comparator, described power input and be connected to a resistance in described minute between the pressure side, be connected to two groups of resistance that are connected parallel with one another between described minute pressure side and the described earth terminal, the resistance value of each described resistance all equates, the inverting input of described voltage comparator is connected with described minute pressure side, the voltage of in-phase input end equals reference voltage, output is connected with charging indicator light circuit; When lithium battery is put into charger and described power input when not switching on, the voltage of described in-phase input end is greater than the voltage of described inverting input, described output output high level, and charging indicator light goes out; When described power input is switched on, the voltage of described inverting input is greater than the voltage of described in-phase input end, described output output low level, charging indicator light is bright, the utility model has utilized the power input of battery charger always to control the work of charging indicator light circuit greater than the fact of lithium battery voltage, the charging voltage of general lithium battery charger is 4.2V, when described power input voltage is 4.2V, if the voltage of described minute pressure side is 1.68V, when adopting the benchmark of reference voltage V ref=1.68V, the voltage of described in-phase input end equals 1.68V, because the voltage of described power input is always greater than 4.2V, therefore put into charger and described power input when not switching on when lithium battery, the voltage of described in-phase input end is greater than the voltage of described inverting input, and described output output high level makes charging indicator light go out and can not glimmer; When described power input was switched on, the voltage of described inverting input was always greater than the voltage of described in-phase input end, and described output output low level makes charging indicator light bright, so the utility model can be avoided charging indication misoperation.
Description of drawings
Fig. 1 is the circuit theory diagrams of the charging indication control circuit of the utility model lithium battery charger controlled integrated circuit;
Fig. 2 is the circuit theory diagrams of the utility model lithium battery charger controlled integrated circuit;
Fig. 3 is that of the utility model lithium battery charger controlled integrated circuit uses connection diagram.
Embodiment
As Fig. 1, Fig. 2, shown in Figure 3, lithium battery charger controlled integrated circuit of the present utility model comprises voltage sample resistor network 1, charging indication control circuit 2, short-circuit protection circuit 3, polar switching switch control circuit 4 and constant-current and constant-voltage control circuit, described charging indication control circuit 2 comprises power input VDD, earth terminal, divide pressure side T, voltage comparator OP2, described power input VDD and be connected to a resistance R 27 in described minute between the pressure side T, (one group is R28 to be connected to two groups of resistance that are connected parallel with one another between described minute pressure side T and the described earth terminal, other one group is R10, the R29 series connection), each described resistance R 10, R27, R28, the resistance value of R29 all equates, the inverting input IN of described voltage comparator OP2-be connected with described minute pressure side T, the voltage of in-phase input end IN+ equals reference voltage, output OUT is connected with charging indicator light circuit; When lithium battery is put into charger and described power input VDD when not switching on, the voltage of described in-phase input end IN+ greater than described inverting input IN-voltage, described output OUT output high level, charging indicator light goes out; When described power input VDD energising, described inverting input IN-voltage greater than the voltage of described in-phase input end IN+, described output OUT output low level, charging indicator light is bright.
The utility model has utilized the power input of battery charger always to control the work of charging indicator light circuit greater than the fact of lithium battery voltage, the charging voltage of general lithium battery charger is 4.2V, when described power input vdd voltage is 4.2V, the voltage of described minute pressure side T is 1.68V, when adopting the benchmark of reference voltage V ref=1.68V, the voltage of described in-phase input end IN+ equals 1.68V, because the voltage of described power input VDD is always greater than 4.2V, therefore put into charger and described power input VDD when not switching on when lithium battery, the voltage of described in-phase input end IN+ greater than the voltage IN of described inverting input-, described output OUT output high level makes charging indicator light go out, and has effectively avoided because the ghost effect of P-MOSFET makes the phenomenon that charging indicator light glimmers; When described power input VDD switches on, described inverting input IN-voltage always greater than the voltage of described in-phase input end IN+, described output OUT output low level makes charging indicator light bright, so the utility model can be avoided charging indication misoperation.
In addition, concrete resistance value and the precision thereof of the magnitude of voltage of described minute pressure side T and each described resistance R 10, R27, R28, R29 all have nothing to do, and only need each described resistance is that the identical resistance of specification just can accurately be determined sampled voltage, easily in integrated circuit, realize, so the utility model manufacturing is easy, sampling is accurate, charging process control is accurate.
The utility model lithium battery charger controlled integrated circuit has power input VDD, earth terminal GND, lithium battery both positive and negative polarity port BT+, BT-, external capacitor port CBP, and power supply is indicated port L3, charging indication port L2, saturated indication port L1, therefore pin outside 8 is arranged after encapsulation, and peripheral circuit is very simple, peripheral cell is few, integrated degree height is easy to promote and use.
The utility model can be widely used in the lithium cell charging field.
Under the situation that does not break away from the present utility model thought, all application the utility model specifications and accompanying drawing content and the various equivalences of being done change, and all reason is with being contained in the claim scope of the present utility model.
Claims (2)
1, a kind of charging indication control circuit of lithium battery charger controlled integrated circuit, it is characterized in that: comprise power input (VDD), earth terminal, divide pressure side (T), voltage comparator (OP2), described power input (VDD) and be connected to resistance (R27) between pressure side (T) in described minute, described minute pressure side (T) with described earth terminal between be connected to two groups of resistance (R28 that are connected parallel with one another, R10, R29), each described resistance (R10, R27, R28, R29) resistance value all equates, the inverting input (IN-) of described voltage comparator (OP2) with described minute pressure side (T) be connected, the voltage of in-phase input end (IN+) equals reference voltage, output (OUT) is connected with charging indicator light circuit; When lithium battery is put into charger and described power input (VDD) when not switching on, the voltage of described in-phase input end (IN+) is greater than the voltage of described inverting input (IN-), described output (OUT) output high level, and charging indicator light goes out; When described power input (VDD) was switched on, the voltage of described inverting input (IN-) was greater than the voltage of described in-phase input end (IN+), described output (OUT) output low level, and charging indicator light is bright.
2, a kind of lithium battery charger controlled integrated circuit, comprise charging indication control circuit, it is characterized in that: described charging indication control circuit comprises power input (VDD), earth terminal, divide pressure side (T), voltage comparator (OP2), described power input (VDD) and be connected to a resistance (R27) between pressure side (T) in described minute, described minute pressure side (T) with described earth terminal between be connected to two groups of resistance (R28 that are connected parallel with one another, R10, R29), each described resistance (R10, R27, R28, R29) resistance value all equates, the inverting input (IN-) of described voltage comparator (OP2) with described minute pressure side (T) be connected, the voltage of in-phase input end (IN+) equals reference voltage, output (OUT) is connected with charging indicator light circuit; When lithium battery is put into charger and described power input (VDD) when not switching on, the voltage of described in-phase input end (IN+) is greater than the voltage of described inverting input (IN-), described output (OUT) output high level, and charging indicator light goes out; When described power input (VDD) was switched on, the voltage of described inverting input (IN-) was greater than the voltage of described in-phase input end (IN+), described output (OUT) output low level, and charging indicator light is bright.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200489291U CN201204479Y (en) | 2008-06-06 | 2008-06-06 | Control integrated circuit for lithium battery charger and electrification indication control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200489291U CN201204479Y (en) | 2008-06-06 | 2008-06-06 | Control integrated circuit for lithium battery charger and electrification indication control circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201204479Y true CN201204479Y (en) | 2009-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200489291U Expired - Fee Related CN201204479Y (en) | 2008-06-06 | 2008-06-06 | Control integrated circuit for lithium battery charger and electrification indication control circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201204479Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291879A (en) * | 2011-05-19 | 2011-12-21 | 惠州Tcl移动通信有限公司 | Control circuit, method and device for charging indicator light as well as charging device |
| CN106937447A (en) * | 2017-04-14 | 2017-07-07 | 上海与德科技有限公司 | Indicating lamp control circuit and electronic equipment |
-
2008
- 2008-06-06 CN CNU2008200489291U patent/CN201204479Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291879A (en) * | 2011-05-19 | 2011-12-21 | 惠州Tcl移动通信有限公司 | Control circuit, method and device for charging indicator light as well as charging device |
| CN106937447A (en) * | 2017-04-14 | 2017-07-07 | 上海与德科技有限公司 | Indicating lamp control circuit and electronic equipment |
| CN106937447B (en) * | 2017-04-14 | 2019-02-05 | 上海与德科技有限公司 | Indicating lamp control circuit and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090304 Termination date: 20120606 |