CN2872709Y - Charging circuit - Google Patents
Charging circuit Download PDFInfo
- Publication number
- CN2872709Y CN2872709Y CNU2006200038809U CN200620003880U CN2872709Y CN 2872709 Y CN2872709 Y CN 2872709Y CN U2006200038809 U CNU2006200038809 U CN U2006200038809U CN 200620003880 U CN200620003880 U CN 200620003880U CN 2872709 Y CN2872709 Y CN 2872709Y
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- Prior art keywords
- charging circuit
- circuit
- power supply
- charging
- voltage
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a charging circuit for charging secondary battery. The charging circuit includes an MOS transistor connected with the main circuit of the charging circuit at the drain and the source thereof to switch on/off the charging circuit; and a voltage comparer for comparing the voltage of a charging power supply with the battery voltage and controlling on/off and the MOS transistor. The voltage comparer includes two input terminals respectively connected with a charging power supply at one terminal and with a battery at the other terminal; the output of the voltage comparer is connected with the gate of the MOS transistor. By adopting MOS transistor as the switch element, the utility model has voltage drop (0.1 V) less than the voltage drop (0.3-0.4 V) of conventional Schottky diode charging circuit during on-state of the MOS transistor. Accordingly, the utility model has larger charging current and higher charging efficiency compared with the conventional circuit with the same capacity of the battery and power supply.
Description
Technical field
The utility model relates to a kind of charging circuit, especially a kind of charging circuit that secondary cell is charged.
Background technology
Traditional charging circuit charges to secondary cell as isolating device by Schottky diode, and the tube voltage drop of Schottky diode is generally 0.3-0.5V, and this just requires the high 0.3-0.5V of voltage ratio cell voltage of charge power supply to charge to battery.For the low-tension supply as the solar panel, the such pressure drop meeting of charging circuit causes under the low light level and can't charge, and can consume many power on diode, greatly reduces the efficient of charging circuit.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of low pressure drop, high efficiency charging circuit.It is little that the technical problem that the utility model further will solve provides a kind of volume, charging circuit with low cost.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of charging circuit comprises a metal-oxide-semiconductor, and its drain electrode and source electrode are connected in the charging circuit main circuit, in order to the open and close charging circuit; One voltage comparator in order to the same cell voltage of charge power supply voltage relatively, and is controlled the break-make of described metal-oxide-semiconductor, two inputs of described voltage comparator, one termination charge power supply, another termination battery, the grid of the described metal-oxide-semiconductor of output termination of voltage comparator.
Above-described charging circuit preferably also comprises divider resistance R2, R3, R4, R5; Divider resistance R2 connects with R3, be connected between the both positive and negative polarity of charge power supply, the contact of divider resistance R2 and R3 connects the inverting input of voltage comparator, and divider resistance R4 connects with R5, be connected between the both positive and negative polarity of battery, the contact of divider resistance R4 and R5 connects the in-phase input end of voltage comparator.
Above-described charging circuit, described metal-oxide-semiconductor can be the N-MOS pipes, and the drain electrode of described N-MOS pipe connects the charge power supply negative pole, and source electrode connects battery cathode.
Above-described charging circuit, described metal-oxide-semiconductor can also be the P-MOS pipes, and the source electrode of described P-MOS pipe connects anode, and drain electrode connects the charge power supply positive pole.
The circuit that above-described charging circuit, described charging circuit both can have been made discrete device separately also can be made independent integrated circuit or be integrated in the integrated circuit as functional module.
The utility model is because adopt metal-oxide-semiconductor to battery charge, and when detecting charge power supply voltage and be higher than cell voltage, the metal-oxide-semiconductor conducting is to battery charge, when detecting supply voltage and be lower than cell voltage, then turns off metal-oxide-semiconductor.The voltage drop of metal-oxide-semiconductor is understood usually less than 0.1V during conducting, and traditional Schottky diode charging circuit has 0.3-0.5V, so under the battery situation identical with power supply, this circuit charging current can be bigger than traditional circuit, and the charge efficiency height.
If the utility model adopts integrated circuit, then can dwindle the volume of charging circuit greatly, reduce the cost of charging circuit.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is the circuit theory diagrams of the utility model charging circuit embodiment 1.
Fig. 2 is the circuit theory diagrams of the utility model charging circuit embodiment 2.
Embodiment
The embodiment 1 of the utility model charging circuit shown in Figure 1 is the N-MOS charging circuit.Wherein, divider resistance R2=R4, R3=R5, A1 are voltage comparator, T1 is the N-MOS pipe.S+, S-are respectively the charge power supply both positive and negative polarity, and B+, B-are respectively the both positive and negative polarity of battery.
N-MOS charging circuit principle: when voltage comparator detected charge power supply voltage and is lower than battery, low level of voltage comparator output was ended metal-oxide-semiconductor, and electric current can not constitute the loop.When detecting charge power supply voltage and be higher than cell voltage, high level of voltage comparator output makes the metal-oxide-semiconductor conducting, charging current, is got back to charge power supply negative pole S-through metal-oxide-semiconductor T1 again and is constituted charge circuit through anode B+, battery cathode B-by the anodal S+ of charge power supply.
The embodiment 2 of the utility model charging circuit shown in Figure 2 is the P-MOS charging circuit.P-MOS charging circuit principle is consistent with N-MOS charging road, has just replaced the N-MOS pipe with the P-MOS pipe, slightly change on the circuit connecting.When voltage comparator A1 detected charge power supply voltage and is lower than battery, high level of voltage comparator A1 output ended metal-oxide-semiconductor T2, and electric current does not constitute the loop.When detecting charge power supply voltage and be higher than cell voltage, low level of voltage comparator A1 output makes the metal-oxide-semiconductor conducting, electric current by the anodal S+ of charge power supply through metal-oxide-semiconductor T2, anode B+, again through battery cathode () get back to the charge power supply negative pole () constitute charge circuit.
Charging circuit of the present utility model is the same with traditional charging circuit, all be when charge power supply voltage is higher than cell voltage to battery charge, charge power supply voltage is lower than when keeping conducting inadequately and ends, not to battery charge.
The utility model adopts metal-oxide-semiconductor as charge member; voltage drop during conducting usually can be less than 0.1V; and traditional Schottky diode charging circuit is wanted 0.3-0.5V; under the charge power supply situation identical with rechargeable battery; this circuit is bigger than traditional circuit charging current, thereby has reduced waste of electric energy.
The circuit that described charging circuit both can have been made discrete device separately also can be made independent integrated circuit or be integrated in the integrated circuit as functional module.
Claims (7)
1. a charging circuit is characterized in that, comprises a metal-oxide-semiconductor, and its drain electrode and source electrode are connected in the charging circuit main circuit, in order to the open and close charging circuit; One voltage comparator in order to the same cell voltage of charge power supply voltage relatively, and is controlled the break-make of described metal-oxide-semiconductor, two inputs of described voltage comparator, one termination charge power supply, another termination battery, the grid of the described metal-oxide-semiconductor of output termination of voltage comparator.
2. charging circuit according to claim 1 is characterized in that, also comprises divider resistance R2, R3, R4, R5; Divider resistance R2 connects with R3, is connected between the both positive and negative polarity of charge power supply, and the contact of divider resistance R2 and R3 connects the inverting input of voltage comparator; Divider resistance R4 connects with R5, is connected between the both positive and negative polarity of battery, and the contact of divider resistance R4 and R5 connects the in-phase input end of voltage comparator.
3. charging circuit according to claim 1 and 2 is characterized in that, described metal-oxide-semiconductor is the N-MOS pipe, and the drain electrode of described N-MOS pipe connects the charge power supply negative pole, and source electrode connects battery cathode.
4. charging circuit according to claim 1 and 2 is characterized in that described metal-oxide-semiconductor is the P-MOS pipe, and the source electrode of described P-MOS pipe connects anode, and drain electrode connects the charge power supply positive pole.
5. charging circuit according to claim 1 and 2 is characterized in that, the circuit that described charging circuit both can have been made discrete device separately also can be made independent integrated circuit or be integrated in the integrated circuit as functional module.
6. charging circuit according to claim 3 is characterized in that, the circuit that described charging circuit both can have been made discrete device separately also can be made independent integrated circuit or be integrated in the integrated circuit as functional module.
7. charging circuit according to claim 4 is characterized in that, the circuit that described charging circuit both can have been made discrete device separately also can be made independent integrated circuit or be integrated in the integrated circuit as functional module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200038809U CN2872709Y (en) | 2006-02-17 | 2006-02-17 | Charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200038809U CN2872709Y (en) | 2006-02-17 | 2006-02-17 | Charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2872709Y true CN2872709Y (en) | 2007-02-21 |
Family
ID=37741049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200038809U Expired - Fee Related CN2872709Y (en) | 2006-02-17 | 2006-02-17 | Charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2872709Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664444A (en) * | 2012-05-30 | 2012-09-12 | 江苏应能微电子有限公司 | Low-voltage charging circuit and solar lamp using low-voltage charging circuit |
| CN101546916B (en) * | 2008-03-27 | 2013-08-21 | 立锜科技股份有限公司 | Battery charger and method for controlling same |
| CN106208234A (en) * | 2016-08-17 | 2016-12-07 | 东莞博力威电池有限公司 | A kind of charger method for measuring charged and testing circuit |
| CN106208301A (en) * | 2016-08-31 | 2016-12-07 | 苏州迈力电器有限公司 | There is the charging circuit of voltage regulation function |
| CN106230080A (en) * | 2016-08-31 | 2016-12-14 | 苏州迈力电器有限公司 | There is the charging circuit of anti-interference function |
-
2006
- 2006-02-17 CN CNU2006200038809U patent/CN2872709Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546916B (en) * | 2008-03-27 | 2013-08-21 | 立锜科技股份有限公司 | Battery charger and method for controlling same |
| CN102664444A (en) * | 2012-05-30 | 2012-09-12 | 江苏应能微电子有限公司 | Low-voltage charging circuit and solar lamp using low-voltage charging circuit |
| CN102664444B (en) * | 2012-05-30 | 2014-12-03 | 江苏应能微电子有限公司 | Low-voltage charging circuit and solar lamp using low-voltage charging circuit |
| CN106208234A (en) * | 2016-08-17 | 2016-12-07 | 东莞博力威电池有限公司 | A kind of charger method for measuring charged and testing circuit |
| CN106208234B (en) * | 2016-08-17 | 2019-07-19 | 东莞博力威电池有限公司 | A kind of charger method for measuring charged and detection circuit |
| CN106208301A (en) * | 2016-08-31 | 2016-12-07 | 苏州迈力电器有限公司 | There is the charging circuit of voltage regulation function |
| CN106230080A (en) * | 2016-08-31 | 2016-12-14 | 苏州迈力电器有限公司 | There is the charging circuit of anti-interference function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: JINWEI SOLAR ENERGY CO., LTD., SHENZHEN CITY Free format text: FORMER NAME OR ADDRESS: SHENGLONGDA ELECTRONIC CO., LTD., SHENZHEN CITY |
|
| CP01 | Change in the name or title of a patent holder |
Address after: The second floor of the workshop on the back of the road, Guanlan Road, Baoan District, Guangdong, Shenzhen Province, 518000 Patentee after: Shenzhen city today Wei Solar Energy Ltd Address before: The second floor of the workshop on the back of the road, Guanlan Road, Baoan District, Guangdong, Shenzhen Province, 518000 Patentee before: Shenglongda Electronic Co., Ltd., Shenzhen |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070221 Termination date: 20100217 |