CN104932596A - Compensating circuit for adjusting output end voltage of charging device - Google Patents
Compensating circuit for adjusting output end voltage of charging device Download PDFInfo
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- CN104932596A CN104932596A CN201510404775.XA CN201510404775A CN104932596A CN 104932596 A CN104932596 A CN 104932596A CN 201510404775 A CN201510404775 A CN 201510404775A CN 104932596 A CN104932596 A CN 104932596A
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- charging device
- operational amplifier
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Abstract
The invention provides a compensating circuit for adjusting output end voltage of a charging device. The output end of the charging device is connected to a load through a power line and grounded through a first resistor and a second resistor which are connected in series, and the charging device comprises a DC-DC converter; the compensating circuit comprises a voltage sampling module which is connected to the DC-DC converter and arranged to be used for sampling and outputting a voltage signal, an operational amplifier which is connected to the voltage sampling module and arranged to be used for receiving and caching the voltage signal and a voltage and current converting module which is arranged between the operational amplifier and the connection point of the first resistor and the second resistor and arranged to be used for generating a corresponding compensating current according to the voltage signal, wherein the compensating current flows from the connection point of the first resistor and the second resistor to the ground. According to the compensating circuit for adjusting the output end voltage of the charging device, the output end voltage of the charging device can be compensated according to the load current change.
Description
Technical field
The invention belongs to electronic technology field, particularly relating 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.
Summary of the invention
The object of the present invention is to provide a kind of compensating circuit of the output end voltage for adjusting charging device, compensating with the output end voltage of change to charging device according to load current.
To achieve these goals, the present invention 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 invention 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 invention realizes;
Fig. 2 is the circuit diagram of voltage compensating circuit of the present invention.
Embodiment
For making to understand technological means of the present invention 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 present invention devises a kind of compensating circuit, and 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 invention, be not intended to limit scope of the present invention, the above embodiment of the present invention can also make a variety of changes.Namely every claims according to the present patent application and description are done simple, equivalence change and modify, and all fall into the claims of patent of the present invention.The not detailed description of the present invention 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 any one of claim 1-3, 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510404775.XA CN104932596B (en) | 2015-07-10 | 2015-07-10 | Compensating circuit for adjusting output end voltage of charging device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510404775.XA CN104932596B (en) | 2015-07-10 | 2015-07-10 | Compensating circuit for adjusting output end voltage of charging device |
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| CN104932596A true CN104932596A (en) | 2015-09-23 |
| CN104932596B CN104932596B (en) | 2017-01-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109478783A (en) * | 2016-07-25 | 2019-03-15 | 罗伯特·博世有限公司 | Method for running electric system |
| CN109976430A (en) * | 2019-04-29 | 2019-07-05 | 苏州易美新思新能源科技有限公司 | A kind of DC power supply circuit |
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| JP2009254002A (en) * | 2008-04-01 | 2009-10-29 | I Cast:Kk | Switching power unit |
| CN101860243A (en) * | 2010-05-14 | 2010-10-13 | 西安英洛华微电子有限公司 | Line loss compensation circuit for switch power supply |
| CN102832806A (en) * | 2012-09-14 | 2012-12-19 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and voltage feedback method thereof |
| CN103558891A (en) * | 2013-09-22 | 2014-02-05 | 龙芯中科技术有限公司 | Low dropout regulator |
| CN204833031U (en) * | 2015-07-10 | 2015-12-02 | 灿瑞半导体(上海)有限公司 | A compensating circuit for adjusting charging device's output voltage |
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2015
- 2015-07-10 CN CN201510404775.XA patent/CN104932596B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009254002A (en) * | 2008-04-01 | 2009-10-29 | I Cast:Kk | Switching power unit |
| CN101860243A (en) * | 2010-05-14 | 2010-10-13 | 西安英洛华微电子有限公司 | Line loss compensation circuit for switch power supply |
| CN102832806A (en) * | 2012-09-14 | 2012-12-19 | 成都芯源系统有限公司 | Switch voltage stabilizing circuit and voltage feedback method thereof |
| CN103558891A (en) * | 2013-09-22 | 2014-02-05 | 龙芯中科技术有限公司 | Low dropout regulator |
| CN204833031U (en) * | 2015-07-10 | 2015-12-02 | 灿瑞半导体(上海)有限公司 | A compensating circuit for adjusting charging device's output voltage |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109478783A (en) * | 2016-07-25 | 2019-03-15 | 罗伯特·博世有限公司 | Method for running electric system |
| CN109478783B (en) * | 2016-07-25 | 2022-08-02 | 罗伯特·博世有限公司 | Method for operating an electrical system |
| CN109976430A (en) * | 2019-04-29 | 2019-07-05 | 苏州易美新思新能源科技有限公司 | A kind of DC power supply circuit |
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| CN104932596B (en) | 2017-01-11 |
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Address after: 200081 Shanghai, North Sichuan Road, room 1717, No. 1006, room Applicant after: SHANGHAI CANRUI TECHNOLOGY CO., LTD. Address before: 200081 Shanghai, North Sichuan Road, room 1717, No. 1006, room Applicant before: Orient-Chip Semiconductor (Shanghai) Co., Ltd. |
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Inventor after: Luo Jie Inventor after: Li Qiuping Inventor before: Luo Liquan Inventor before: Luo Jie Inventor before: Li Qiuping |
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Address after: 200072 Jingan District extension Road, Shanghai science and technology building, room 149, Room 308 Applicant after: SHANGHAI CANRUI TECHNOLOGY CO., LTD. Address before: 200081 Shanghai, North Sichuan Road, room 1717, No. 1006, room Applicant before: SHANGHAI CANRUI TECHNOLOGY CO., LTD. |
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