CN104079011B - Charging circuit - Google Patents
Charging circuit Download PDFInfo
- Publication number
- CN104079011B CN104079011B CN201310095723.XA CN201310095723A CN104079011B CN 104079011 B CN104079011 B CN 104079011B CN 201310095723 A CN201310095723 A CN 201310095723A CN 104079011 B CN104079011 B CN 104079011B
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- motor
- mos transistor
- diode
- battery
- electromotive force
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A kind of charging circuit, including PMU, motor, MOS transistor, the first diode, the second diode and battery, the PMU are used for drive motor and control the conducting and cut-off of MOS transistor；When the PMU drives the motor, the MOS transistor is in the conduction state；When the PMU stops driving the motor, the motor produces an inverse electromotive force, and now the MOS transistor ends, and the inverse electromotive force charges the battery；When inverse electromotive force stops charging, MOS transistor conducting, inverse electromotive force is discharged by the second diode.The charging circuit of the present invention, the inverse electromotive force is charged to battery, that is, eliminates the harm of inverse electromotive force, takes full advantage of the energy again.
Description
Technical field
The present invention relates to a kind of charging circuit, more particularly to a kind of charging circuit applied to portable electron device.
Background technology
Increasing interior of mobile phone is fitted with shaking motor, because motor is an inductance coil, is disconnected in motor
During power supply, motor can produce an inverse electromotive force, and the power management of the motor is driven to prevent the inverse electromotive force from burning out
Unit（Power Management Unit, PMU）, it is common practice to motor one fly-wheel diode of parallel connection, the pole of afterflow two
Pipe and motor form loop, so as to which inverse electromotive force be consumed.
With the increase of cell-phone function, the power consumption of battery of mobile phone certainly will also increase, it is necessary to continually by mobile phone
Charging circuit charges the battery, and is made troubles to user.
The content of the invention
In view of the above-mentioned problems, it is necessary to provide a kind of charging circuit of recoverable inverse electromotive force.
A kind of charging circuit, including PMU, motor, metal-oxide semiconductor (MOS)（Mental-Oxide-
Semiconductor, MOS）Transistor, the first diode, the second diode and battery, the PMU are used to drive
Motor and the conducting and cut-off for controlling MOS transistor, the motor electrically connect the drain electrode of MOS transistor, first diode
Anode is electrically connected to the node between the motor and the drain electrode of MOS transistor, the negative pole of the battery, the source electrode of MOS transistor with
And second the anode of diode be grounded, the negative electrode of second diode is electrically connected between the motor and PMU
Node；When the PMU drives the motor operations, the MOS transistor is in the conduction state；When the power management list
When member stops driving the motor, the motor produces an inverse electromotive force, and now the MOS transistor ends, the inverse electromotive force
Charge the battery；When inverse electromotive force stops charging, MOS transistor conducting, inverse electromotive force is released by the second diode
Put.
The charging circuit of the present invention, the inverse electromotive force is charged to battery, that is, eliminates the harm of inverse electromotive force, again
Take full advantage of the energy.
Brief description of the drawings
Fig. 1 is the circuit diagram of the charging circuit of better embodiment of the present invention.
Fig. 2 is the circuit diagram of another embodiment of charging circuit of the present invention.
Main element symbol description
Following embodiment will combine above-mentioned accompanying drawing and further illustrate the present invention.
Embodiment
Referring to Fig. 1, the charging circuit 100 of better embodiment of the present invention includes PMU 10, motor 20, gold
Belong to oxide semiconductor（Mental-Oxide-Semiconductor, MOS）Transistor M, the first diode D1, the second diode
D2, inductance L, electric capacity C and battery 30.
The PMU 10 includes power supply output pin VIB and controlling switch GPIO.
The motor 20 is connected with the power supply output pin VIB of PMU 10, to allow PMU 10 to be
Motor 20 provides power supply.Motor 20 is set to first node A with power supply output pin VIB one end being connected, the other end is set to
Two node B.
MOS transistor M drain electrode d is electrically connected at the B ends of motor 20, so that motor 20 is electrically connected to power supply output and drawn
Between pin VIB and drain electrode d, MOS transistor M source class s ground connection, MOS transistor M grid g is electrically connected with controlling switch
GPIO, when controlling switch GPIO exports high level, MOS transistor M conductings, when controlling switch GPIO exports low level,
MOS transistor M ends.
First diode D1 anode is electrically connected to MOS transistor M drain electrode d, first diode D1 negative electrode electricity
It is connected to inductance L.Second diode D2 plus earth, second diode D2 negative electrode are electrically connected to first node A.
In the present embodiment, the first diode D1 and the second diode D2 are Schottky diode.
Inductance L and electric capacity C is used for smooth voltage.Inductance L one end is electrically connected to the first diode D1 negative electrode, separately
One end is electrically connected to the positive pole of battery 30.Electric capacity C is in parallel with the battery 30.
The battery 30 is used to store electric energy.The negative pole ground connection of the battery 30.In the present embodiment, the voltage of the battery 30 exists
For 3.4V between 4.3V, the voltage is more than the voltage of power supply output pin VIB outputs.
In use, the power supply output pin VIB output voltages of the PMU 10 are to the motor 20 to drive, the electricity
The controlling switch GPIO of source control unit 10 exports high level so that MOS transistor M is in the conduction state.Due to battery 30
Voltage is more than power supply output pin VIB output voltage, the voltage at the first diode D1 negative electrode is more than the first diode
Voltage at D1 anode, so as to which the first diode D1 ends.The power supply output pin VIB output currents, by motor 20,
MOS transistor M forms primary Ioops, now the motor 20 is in running order until ground.
When power supply output pin VIB output voltage disconnects, during the motor 20 is by working condition to halted state,
Motor 20 slows down to produce an inverse electromotive force, i.e., one and power supply output pin VIB output voltages are produced on motor 20
The opposite voltage of both positive and negative polarity.While power supply output pin VIB output voltages disconnect, controlling switch GPIO voltage also breaks
Open, so that MOS transistor M ends.Because the voltage of now inverse electromotive force is more than the voltage of battery 30, the motor 20, the
One diode D1, inductance L, the diode D2 of battery 30 and second form primary Ioops, and the battery 30 is charged so as to realize.
In the charging process of battery 30, the inverse electromotive force is gradually reduced, until the voltage of the inverse electromotive force and battery 30
When difference is less than the first diode D1 conducting voltage, now first diode D1 ends, and battery 30 stops charging.The motor
The not release completely of 20 inverse electromotive force, the controlling switch GPIO output high level of the PMU 10 was so that should
MOS transistor M is turned on.Now the motor 20, MOS transistor M and the second diode D2 form primary Ioops, quickly will be reversely electric
Kinetic potential discharges completely.
MOS transistor M needs to be in when the battery 30 charges all is by MOS transistor M in state, other times
It is in the conduction state.In the present embodiment, control MOS brilliant by software set controlling switch GPIO high level and low level
The body pipe M ON-OFF time, because the inverse electromotive force of motor 20 charges quickly to battery 30, therefore typically set controlling switch
The GPIO low level times are several milliseconds.
Preferably, such as Fig. 2, section point B voltage is gathered so as to accordingly control by increasing an Acquisition Circuit 40
The level state of controlling switch GPIO outputs.The Acquisition Circuit 40 includes first resistor R1 and second resistance R2.This first
Resistance R1 one end is electrically connected at section point B, and the first resistor R1 other end and second resistance R2 are electrically connected with, and this second
Resistance R2 is grounded.First resistor R1 and second resistance R2 are connected to partial pressure, and the PMU 10 also draws including collection
Pin ADC, collection pin ADC is connected between first resistor R1 and second resistance R2, for detecting section point B voltage,
So as to control controlling switch GPIO output high level or low level.When section point B voltage is more than the voltage of battery 30
When, controlling switch GPIO output low levels, MOS transistor M cut-offs.When section point B voltage is less than the voltage of battery 30
When, controlling switch GPIO output high level, MOS transistor M conductings.
The charging circuit 100 using inverse electromotive force of the present invention, the inverse electromotive force is charged to battery 30, that is, eliminated
Inverse electromotive force harm, take full advantage of the energy again.
In addition, those skilled in the art can also the claims in the present invention scope of disclosure and spirit in do other forms and
Various modifications, addition and replacement in details.Certainly, these various modifications, addition and replacements for being made according to present invention spirit
Deng change, should all be included within scope of the present invention.
Claims (5)
1. a kind of charging circuit, the charging circuit includes battery, it is characterised in that：The charging circuit also includes power management list
Member, motor, metal-oxide semiconductor (MOS) (MOS) transistor, the first diode and the second diode, the PMU are used
In drive motor and control MOS transistor conducting and cut-off, the motor electrically connect MOS transistor drain electrode, the one or two
The anode of pole pipe is electrically connected to the node between the motor and the drain electrode of MOS transistor, the negative pole of the battery, MOS transistor
The anode of source electrode and the second diode is grounded, and the negative electrode of second diode is electrically connected to the motor and PMU
Between node；When the PMU drives the motor operations, the MOS transistor is in the conduction state；When the power supply
When administrative unit stops driving the motor, the motor produces an inverse electromotive force, and now the PMU controls the MOS
Transistor cutoff, the inverse electromotive force charge the battery；When the voltage difference of the inverse electromotive force and battery is less than the first diode
Conducting voltage when, inverse electromotive force stop charging, the PMU control the MOS transistor turn on, inverse electromotive force
Discharged by the second diode.
2. charging circuit as claimed in claim 1, it is characterised in that：First diode and the second diode are Schottky two
Pole pipe.
3. charging circuit as claimed in claim 1, it is characterised in that：The PMU include power supply output pin and
Controlling switch, the power supply output pin is electrically connected to the motor, and to provide power supply for the motor, the controlling switch is electrically connected with
To the grid of the MOS transistor, to control the conducting and cut-off of the MOS body pipes.
4. charging circuit as claimed in claim 1, it is characterised in that：The charging circuit also includes Acquisition Circuit, collection electricity
Road includes first resistor and second resistance, and the first resistor is serially connected to motor and MOS transistor with second resistance
Between section point, the first resistor and second resistance be connected to partial pressure, and the PMU also includes collection pin,
The collection pin is connected to the node between first resistor and second resistance, so as to control the controlling switch output high level or
Low level, when the voltage at the node between motor and MOS transistor is more than the voltage of battery, the controlling switch exports low electricity
Flat, i.e., MOS transistor ends, when the voltage at the node between motor and MOS transistor is less than the voltage of battery, the control
Pin exports high level, i.e. MOS transistor turns on.
5. charging circuit as claimed in claim 1, it is characterised in that：The charging circuit also includes inductance and electric capacity, the electricity
Sense one end electrically connects the negative electrode of first diode, and the other end of the inductance electrically connects the anode of the battery, the electric capacity and battery
Parallel connection, the inductance are used for the voltage of the smooth inverse electromotive force with electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310095723.XA CN104079011B (en) | 2013-03-25 | 2013-03-25 | Charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310095723.XA CN104079011B (en) | 2013-03-25 | 2013-03-25 | Charging circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104079011A CN104079011A (en) | 2014-10-01 |
| CN104079011B true CN104079011B (en) | 2018-01-30 |
Family
ID=51600118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310095723.XA Active CN104079011B (en) | 2013-03-25 | 2013-03-25 | Charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104079011B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108400744A (en) * | 2018-03-28 | 2018-08-14 | 深圳还是威健康科技有限公司 | A kind of motor drive circuit and smart machine |
| CN114337470B (en) * | 2022-01-04 | 2024-01-30 | 大陆汽车研发（重庆）有限公司 | Motor reversal protection device, protection method thereof and motor driving system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1270907A (en) * | 1999-04-16 | 2000-10-25 | 武汉云鹤车辆制造厂 | Controller for electrical motorcycle |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09147470A (en) * | 1995-11-21 | 1997-06-06 | Nec Corp | Battery incorporated type power saving magnetic disk device |
| KR101179427B1 (en) * | 2008-02-20 | 2012-09-05 | 주식회사 만도 | Device for driving motor in a electronic brake system |
-
2013
- 2013-03-25 CN CN201310095723.XA patent/CN104079011B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1270907A (en) * | 1999-04-16 | 2000-10-25 | 武汉云鹤车辆制造厂 | Controller for electrical motorcycle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104079011A (en) | 2014-10-01 |
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