CN204833031U - A compensating circuit for adjusting charging device's output voltage - Google Patents
A compensating circuit for adjusting charging device's output voltage Download PDFInfo
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- CN204833031U CN204833031U CN201520499201.0U CN201520499201U CN204833031U CN 204833031 U CN204833031 U CN 204833031U CN 201520499201 U CN201520499201 U CN 201520499201U CN 204833031 U CN204833031 U CN 204833031U
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Abstract
The utility model provides a compensating circuit for adjusting charging device's output voltage, this charging device's output is connected to load and first resistance and the 2nd grounding through establishing ties through the power line to this charging device still includes a DC -DC converter, and this compensating circuit includes: a voltage sample module that is connected to the DC -DC converter, it sets up to sampling and output voltage, an operational amplifier who is connected to the voltage sample module, it sets up to receiving and buffer memory voltage signal, and the voltage commentaries on classics electric current module of a connection between the tie point of operational amplifier and first resistance and second resistance, it sets up to generating corresponding offset current according to voltage signal, and wherein, this offset current's orientation is the tie point flow direction ground from first resistance and second resistance. The utility model discloses can compensate according to load current's the change output voltage to charging device.
Description
Technical field
The utility model belongs to electronic technology field, particularly relates to a kind of compensating circuit of the output end voltage for adjusting charging device.
Background technology
When using charging device, charging device may need to be connected to load by very long line of electric force.When load is increasing, the voltage transferring to load can produce pressure drop relative to the output voltage of charging device.Therefore, need to compensate the output voltage of charging device, when making it be connected to different loads, the voltage of load end can as far as possible close to output voltage.
Utility model content
The purpose of this utility model is the compensating circuit providing a kind of output end voltage for adjusting charging device, compensates with the output end voltage of change to charging device according to load current.
To achieve these goals, the utility model adopts following technical scheme:
A kind of compensating circuit of the output end voltage for adjusting charging device, wherein, the output terminal of this charging device is connected to load by line of electric force and passes through the first resistance and second resistance eutral grounding of series connection, and this charging device also comprises a dc-dc, it is set to the voltage constant at the tie point place of maintenance first resistance and the second resistance on the one hand, be set on the other hand detect load current and the conversion of this load current is generated corresponding voltage signal, this compensating circuit comprises:
The one voltage sample module being connected to described dc-dc, it is set to sample and exports described voltage signal;
One operational amplifier being connected to described voltage sample module, it is set to receive and voltage signal described in buffer memory; And
One is connected to described operational amplifier and the voltage between described first resistance and the tie point of the second resistance turns current module, it is set to generate corresponding offset current according to described voltage signal, wherein, the direction of this offset current is flow to ground from the tie point of described first resistance and the second resistance.
Further, described voltage sample module comprises:
One the first transistor, its grid is set to the peripheral enable signal of reception one, and drain electrode is connected to described dc-dc to receive described voltage signal;
One the 3rd resistance, its one end is connected to the source electrode of described the first transistor, and the other end is connected to the in-phase input end of described operational amplifier; And
One electric capacity, its one end is connected between described 3rd resistance and the in-phase input end of described operational amplifier, other end ground connection.
Further, described voltage turns current module and comprises:
One transistor seconds, its grid is connected to the output terminal of described operational amplifier, and source electrode is connected to the inverting input of described operational amplifier;
One the 4th resistance, its one end is connected between the source electrode of described transistor seconds and the inverting input of described operational amplifier, other end ground connection;
One compensates start unit, and it is set to generation one threshold electric current; And
One current lens unit, its reference edge is connected to the drain electrode of described compensation start unit and described transistor seconds, and output terminal is connected to the tie point of described first resistance and the second resistance.
Preferably, described current lens unit comprises the drain electrode that is connected on described transistor seconds and the first current mirror between described first resistance and the tie point of the second resistance and the second current mirror, wherein, described first current mirror is made up of the P shape metal-oxide-semiconductor that two are total to grid, and the second current mirror is made up of the N shape metal-oxide-semiconductor that two are total to grid.
In sum, compensating circuit of the present utility model can gather load current and export corresponding offset current according to this load current, and when load current is larger, offset current is larger, then the voltage of charging device voltage output end just can be larger, thus realize the compensation to load voltage.
Accompanying drawing explanation
Fig. 1 is the principle schematic that voltage compensating circuit of the present utility model realizes;
Fig. 2 is the circuit diagram of voltage compensating circuit of the present utility model.
Embodiment
For making to understand technological means of the present utility model and feature further in depth, careful cooperation accompanying drawing gives citing again and illustrates in rear further:
As shown in Figure 1, in charging device, its voltage output end, by first, second resistance R1, R2 ground connection of series connection, is connected to load to power to the load by longer line of electric force simultaneously.Should be appreciated that, when load current Iload is larger, line of electric force attrition voltage is larger, then load end is larger relative to the pressure drop of voltage output end voltage Vout.In the case, in order to compensate load terminal voltage, following technical scheme can be adopted: the voltage constant (can be realized by dc-dc) first keeping the tie point O place between R1, R2, then an extra offset current Icomp (being equivalent to a corresponding resistance in parallel at R2 two ends) that can change with load current Iload is being provided between O with ground, thus the electric current flowing through R1 is correspondingly increased, voltage output end voltage Vout correspondingly raises, to realize the compensation to load voltage.
In order to provide the aforesaid offset current Icomp changed with load current Iload, the utility model devises a kind of compensating circuit, as shown in Figure 2, this compensating circuit comprises a voltage sample module, an operational amplifier A and a voltage of connecting successively and turns current module.
Respectively modules is described in detail below:
Voltage sample module 10 comprises a first transistor MN1, one a 3rd resistance R3 and electric capacity C1.Wherein, the grid of the first transistor MN1 is connected to an Enable Pin for reception one enable signal, source electrode is connected to the in-phase input end of operational amplifier A by the 3rd resistance R3, drain electrode is connected to a dc-dc (not shown), and this dc-dc is used herein to and detects load current Iload and convert this load current Iload to corresponding voltage Vsamp; One end of electric capacity C1 is connected between R3 and the in-phase input end of operational amplifier A, other end ground connection.Should be appreciated that, V1 can be regulated to follow the speed of Vsamp by regulating the sampling frequency of enable signal and the size of R1, C1.
Voltage turns current module and comprises a transistor seconds MN2, compensation start unit, one the 4th resistance R4 and a current lens unit.Wherein, the grid of this transistor seconds MN2 is connected to the output terminal of operational amplifier A, and source electrode is connected to the inverting input of operational amplifier A and by the 4th resistance R4 ground connection, drain electrode is connected to current lens unit.Operational amplifier A this mainly as impact damper to play the effect of isolation, for preventing subsequent conditioning circuit, adverse effect is caused to voltage Vsamp.When V2 is greater than threshold voltage vth (MN2) of MN2, MN2 conducting, the current value flowing through MN2 is (V2-vth (MN2))/R2.
Compensate start unit and be connected to current lens unit equally, it is used herein to generation one threshold current signal, should be appreciated that, when the electric current of MN2 drain electrode must be greater than this threshold electric current, current lens unit just exports offset current Icomp.
In the present embodiment, current lens unit comprises the first current mirror be made up of two P shape metal-oxide-semiconductor MP1, MP2 being total to grid and the second current mirror be made up of two N shape metal-oxide-semiconductor MN3, MN4 being total to grid.Wherein, the reference edge of the first current mirror and the drain electrode of transistor seconds MN2 with compensate start-up circuit and be connected, its output terminal is connected with the reference edge of the second current mirror, and the output terminal of the second current mirror is connected between R1, R2, and the electric current of its output terminal is offset current Icomp.
Should be appreciated that, when load current Iload is larger, the voltage that voltage sample module 10 is sampled is higher, then the grid voltage of transistor seconds MN2 is higher, the electric current flowing through MPB1 is larger, and under the effect of current mirror module, the offset current Icomp of output is larger, and then make the voltage Vout of the voltage output end of charging device higher, thus realize the compensation to load terminal voltage.
Above-described, be only preferred embodiment of the present utility model, be not intended to limit scope of the present utility model, above-described embodiment of the present utility model can also make a variety of changes.Namely every claims according to the utility model application and description are done simple, equivalence change and modify, and all fall into the claims of the utility model patent.The not detailed description of the utility model be routine techniques content.
Claims (4)
1. one kind for adjusting the compensating circuit of the output end voltage of charging device, wherein, the output terminal of this charging device is connected to load by line of electric force and passes through the first resistance and second resistance eutral grounding of series connection, and this charging device also comprises a dc-dc, it is set to the voltage constant at the tie point place of maintenance first resistance and the second resistance on the one hand, be set on the other hand detect load current and the conversion of this load current is generated corresponding voltage signal, it is characterized in that, this compensating circuit comprises:
The one voltage sample module being connected to described dc-dc, it is set to sample and exports described voltage signal;
One operational amplifier being connected to described voltage sample module, it is set to receive and voltage signal described in buffer memory; And
One is connected to described operational amplifier and the voltage between described first resistance and the tie point of the second resistance turns current module, it is set to generate corresponding offset current according to described voltage signal, wherein, the direction of this offset current is flow to ground from the tie point of described first resistance and the second resistance.
2. the compensating circuit of the output end voltage for adjusting charging device according to claim 1, is characterized in that, described voltage sample module comprises:
One the first transistor, its grid is set to the peripheral enable signal of reception one, and drain electrode is connected to described dc-dc to receive described voltage signal;
One the 3rd resistance, its one end is connected to the source electrode of described the first transistor, and the other end is connected to the in-phase input end of described operational amplifier; And
One electric capacity, its one end is connected between described 3rd resistance and the in-phase input end of described operational amplifier, other end ground connection.
3. the compensating circuit of the output end voltage for adjusting charging device according to claim 1, is characterized in that, described voltage turns current module and comprises:
One transistor seconds, its grid is connected to the output terminal of described operational amplifier, and source electrode is connected to the inverting input of described operational amplifier;
One the 4th resistance, its one end is connected between the source electrode of described transistor seconds and the inverting input of described operational amplifier, other end ground connection;
One compensates start unit, and it is set to generation one threshold electric current; And
One current lens unit, its reference edge is connected to the drain electrode of described compensation start unit and described transistor seconds, and output terminal is connected to the tie point of described first resistance and the second resistance.
4. the compensating circuit of the output end voltage for adjusting charging device according to claim 3, it is characterized in that, described current lens unit comprises the drain electrode that is connected on described transistor seconds and the first current mirror between described first resistance and the tie point of the second resistance and the second current mirror, wherein, described first current mirror is made up of the P shape metal-oxide-semiconductor that two are total to grid, and the second current mirror is made up of the N shape metal-oxide-semiconductor that two are total to grid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520499201.0U CN204833031U (en) | 2015-07-10 | 2015-07-10 | A compensating circuit for adjusting charging device's output voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520499201.0U CN204833031U (en) | 2015-07-10 | 2015-07-10 | A compensating circuit for adjusting charging device's output voltage |
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| Publication Number | Publication Date |
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| CN204833031U true CN204833031U (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520499201.0U Active CN204833031U (en) | 2015-07-10 | 2015-07-10 | A compensating circuit for adjusting charging device's output voltage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104932596A (en) * | 2015-07-10 | 2015-09-23 | 灿瑞半导体(上海)有限公司 | Compensating circuit for adjusting output end voltage of charging device |
| CN106300366A (en) * | 2016-08-30 | 2017-01-04 | 合肥智博电气有限公司 | Electromagnetism voltage-stabilizing energy-saving device electromagnetic compensation voltage-stabilizing system |
| US11340428B2 (en) | 2019-01-03 | 2022-05-24 | Jiangxi Lianyi Optics Co, , Ltd. | Telephoto lens and mobile terminal |
-
2015
- 2015-07-10 CN CN201520499201.0U patent/CN204833031U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104932596A (en) * | 2015-07-10 | 2015-09-23 | 灿瑞半导体(上海)有限公司 | Compensating circuit for adjusting output end voltage of charging device |
| CN106300366A (en) * | 2016-08-30 | 2017-01-04 | 合肥智博电气有限公司 | Electromagnetism voltage-stabilizing energy-saving device electromagnetic compensation voltage-stabilizing system |
| US11340428B2 (en) | 2019-01-03 | 2022-05-24 | Jiangxi Lianyi Optics Co, , Ltd. | Telephoto lens and mobile terminal |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CB03 | Change of inventor or designer information |
Inventor after: Luo Jie Inventor after: Li Qiuping Inventor before: Luo Liquan Inventor before: Luo Jie Inventor before: Li Qiuping |
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| COR | Change of bibliographic data | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 200081 Shanghai, North Sichuan Road, room 1717, No. 1006, room Patentee after: SHANGHAI CANRUI TECHNOLOGY CO., LTD. Address before: 200081 Shanghai, North Sichuan Road, room 1717, No. 1006, room Patentee before: Orient-Chip Semiconductor (Shanghai) Co., Ltd. |
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| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 200072 Jingan District extension Road, Shanghai science and technology building, room 149, Room 308 Patentee after: SHANGHAI CANRUI TECHNOLOGY CO., LTD. Address before: 200081 Shanghai, North Sichuan Road, room 1717, No. 1006, room Patentee before: SHANGHAI CANRUI TECHNOLOGY CO., LTD. |