CN202094845U - Device for managing power supply - Google Patents
Device for managing power supply Download PDFInfo
- Publication number
- CN202094845U CN202094845U CN2011200805676U CN201120080567U CN202094845U CN 202094845 U CN202094845 U CN 202094845U CN 2011200805676 U CN2011200805676 U CN 2011200805676U CN 201120080567 U CN201120080567 U CN 201120080567U CN 202094845 U CN202094845 U CN 202094845U
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- China
- Prior art keywords
- oxide
- semiconductor
- metal
- power supply
- comparison circuit
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Abstract
In order to provide a simple and low-loss substitute for a Schottky diode in a heavy current application, the utility model put forwards a device for managing a power supply, comprising: an MOS (Metal Oxide Semiconductor) tube used for connecting the power supply to a load circuit; and a comparison circuit used for comparing a D-pole voltage and an S-pole voltage of the MOS tube, wherein an output signal of the comparison circuit controls a G-pole voltage of the MOS tube so as to control a starting or closing state of an MOS device. The MOS tube is a P-type or an N-type MOS tube, and the comparison circuit can be an operation amplifier or a comparator.
Description
Technical field
The utility model relates to a kind of electric power controller, relates in particular to a kind of electric power management circuit and method of selecting between the input power supply.
Background technology
Electronic equipment for consumption has the function that a plurality of input power supplys are selected usually, therefore needs a power-supply management system in electronic equipment, carries out preventing when power supply is selected that at equipment revers voltage from causing power supply or the reverse high voltage of battery to recharge and produce danger.Usually, in electric power management circuit, adopt Schottky diode that multiple power supplies is connected on the POL together.
Be illustrated in figure 1 as many inputs electric power management circuit of using Schottky diode.Circuit load Rload can pass through current source or powered battery, and D1 and D2 are Schottky diode.Utilize its forward conduction, the characteristic of oppositely ending can prevent revers voltage, the protection power supply.
But there is big pressure drop in Schottky diode when forward conduction, and its voltage drop value increases with electric current, is example with D1, when selecting current source to import, and D1 conducting, current value I
1=1A, pressure drop U
1=0.4V, the power of D1 loss is P
1=U
1I
1=1*0.4=0.4W is when the electric current that flows through D1 increases, as I
1=2A, the pressure drop of D1 will increase to about 1V thereupon so, at this moment, P
1Be 2W, the D1 heating will be compared serious, and the system loss power consumption is also bigger.
Summary of the invention
For in big electric current is used for Schottky diode provides simple, a low-loss substitute, the utility model proposes a kind of electric power controller, comprise metal-oxide-semiconductor, power supply is offered load circuit; Comparison circuit, relatively metal-oxide-semiconductor drain electrode and source voltage produce an output signal, the grid voltage of described output signal control metal-oxide-semiconductor; And load circuit.
Further, described metal-oxide-semiconductor is P type or N type metal-oxide-semiconductor.Described comparison circuit can be operational amplifier or comparator.The output signal that described comparison circuit produces is by triode and the grid of pull-up resistor control metal-oxide-semiconductor and the voltage difference of source electrode.
Other features and advantages of the utility model will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the utility model.The purpose of this utility model and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Introduce preferred embodiment below in conjunction with accompanying drawing, the technical scheme that the utility model proposes is described in detail.Should be noted that the purpose of accompanying drawing just is convenient to the explanation to the utility model specific embodiment, is not a kind of unnecessary narration or to the restriction of the utility model scope.
Description of drawings
Fig. 1 is for using many inputs electric power management circuit of Schottky diode.
Fig. 2 is the replacement circuit of Schottky diode.
Fig. 3 is the circuit diagram of second embodiment of the utility model.
Embodiment
Embodiment one
Be illustrated in figure 2 as the replacement circuit of Schottky diode.Power supply V2 connects the reverse input end of the metal-oxide-semiconductor D utmost point and comparator respectively, and described comparator output terminal connects the metal-oxide-semiconductor G utmost point, and the described metal-oxide-semiconductor S utmost point is connected load Rload1 with the comparator positive input.
The pressure reduction Vds of the described comparator contrast metal-oxide-semiconductor D utmost point and the S utmost point, when V2 powered, the D pole tension was higher than the S pole tension, and comparator is output as low level, and the G utmost point is pulled to electronegative potential, and the G utmost point and S interpolar form pressure reduction, the Vds conducting, V2 powers to load Rload.
When system adds the selection power supply, when promptly load Rload has multiple-way supply, the situation that the S pole tension is higher than the D pole tension might appear, in the present embodiment, closure by switch S 1 realizes the connection of power supply V1 in circuit, and V1 voltage is higher than V2, promptly when switch S 1 closure, a revers voltage will appear in circuit, at this moment, will cause the S pole tension of metal-oxide-semiconductor to be higher than the D pole tension, comparator is output as high level, G is high potential very, and metal-oxide-semiconductor ends.Like this, can prevent revers voltage, cause the damage of V2 or meet accident.
The internal resistance of metal-oxide-semiconductor can be very little, and pressure drop is almost nil, selects P-MOS pipe in the present embodiment for use, and model is IRF9388, and internal resistance R is about 0.01 Ω, when flowing through electric current I and be 2A, and loss power P=I
2R=2
2* 0.01=0.04W, and the loss power P of Schottky diode among Fig. 1
1=2W, P is much smaller than P
1
Therefore, in the native system, the system configuration of metal-oxide-semiconductor and comparator has replaced Schottky diode, when big electric current passes through, can reduce power consumption, increases work efficiency.
Embodiment two
Be illustrated in figure 3 as the circuit diagram of second embodiment of the utility model.Power supply V3 connects load Rload2 by metal-oxide-semiconductor, comparator compares the voltage of the metal-oxide-semiconductor D utmost point and the S utmost point, the B pole tension of output signal control triode Q, the E utmost point of triode Q is connected with the G utmost point of metal-oxide-semiconductor, and a pull-up resistor R1 connects between the metal-oxide-semiconductor G utmost point and load Rload2.
When the D of metal-oxide-semiconductor pole tension is higher than the S utmost point, the comparator output low level, the B utmost point of triode Q is pulled low to electronegative potential, Q conducting this moment, the G utmost point of metal-oxide-semiconductor also is pulled to electronegative potential, produces Vgs, and metal-oxide-semiconductor is switched on, and is powered to load Rload2 by power supply V4.
In the present embodiment, by the connection of closure realization power supply V3 in circuit of switch S 2, V3 voltage is higher than V4, promptly when switch S 2 closures, a revers voltage will appear in circuit, at this moment, to cause the S pole tension of metal-oxide-semiconductor to be higher than the D pole tension, comparator is exported high level, draws high the B utmost point of Q, Q is cut off, so the G utmost point of metal-oxide-semiconductor is pulled to the S electrode potential by pull-up resistor R1, i.e. V3 voltage, not conducting of metal-oxide-semiconductor, V3 voltage can not be back to V4, causes the damage of power supply V4.
In embodiment one, because comparator is when input terminal voltage (the D utmost point of metal-oxide-semiconductor and the S utmost point) relatively, the high level of output can be lower than the S pole tension slightly, and Vgs has a pressure reduction like this, may cause the reverse-conducting of metal-oxide-semiconductor, causes the damage of power supply V2.Utilize a triode Q and pull-up resistor R1 in this enforcement, make if the upper voltage limit of comparator greater than the conducting voltage of 0.6V(triode Q), triode just can conducting, metal-oxide-semiconductor can reverse-conducting yet.Like this, can reduce selectional restriction, reduce the complexity of circuit comparator.
The utility model can be used for multi-power supply system, also can be used for other anti-reverse turning circuits, compares with using diode, can reduce power consumption.
The utility model adopts comparator, also can adopt the low-power consumption amplifier.
The above only is a preferred implementation of the present utility model; but not to be the limitation of the utility model scope should be understood that for they; for those skilled in the art; under the prerequisite that does not break away from the utility model principle, some improvements and modifications of having done also should be considered as within the protection range of the present utility model.
Claims (4)
1. an electric power controller comprises
Metal-oxide-semiconductor offers load circuit with power supply;
Comparison circuit, relatively metal-oxide-semiconductor drain electrode and source voltage produce an output signal, the grid voltage of described output signal control metal-oxide-semiconductor; And
Load circuit.
2. electric power controller according to claim 1 is characterized in that, described metal-oxide-semiconductor is P type or N type metal-oxide-semiconductor.
3. electric power controller according to claim 1, described comparison circuit can be operational amplifier or comparator.
4. electric power controller according to claim 1 is characterized in that, the output signal that described comparison circuit produces is by triode and the grid of pull-up resistor control metal-oxide-semiconductor and the voltage difference of source electrode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200805676U CN202094845U (en) | 2011-03-24 | 2011-03-24 | Device for managing power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200805676U CN202094845U (en) | 2011-03-24 | 2011-03-24 | Device for managing power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202094845U true CN202094845U (en) | 2011-12-28 |
Family
ID=45369885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200805676U Expired - Lifetime CN202094845U (en) | 2011-03-24 | 2011-03-24 | Device for managing power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202094845U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103872906A (en) * | 2012-12-18 | 2014-06-18 | 中兴通讯股份有限公司 | Control device and control method of communication power supply |
| CN105245214A (en) * | 2015-11-12 | 2016-01-13 | 郑州雅晨生物科技有限公司 | Battery switching circuit |
| CN110707945A (en) * | 2018-07-10 | 2020-01-17 | Oppo广东移动通信有限公司 | Rectifier circuit, wireless charging device, power supply equipment and wireless charging system |
-
2011
- 2011-03-24 CN CN2011200805676U patent/CN202094845U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103872906A (en) * | 2012-12-18 | 2014-06-18 | 中兴通讯股份有限公司 | Control device and control method of communication power supply |
| CN103872906B (en) * | 2012-12-18 | 2018-08-24 | 南京中兴新软件有限责任公司 | The control device and method of communication power supply |
| CN105245214A (en) * | 2015-11-12 | 2016-01-13 | 郑州雅晨生物科技有限公司 | Battery switching circuit |
| CN110707945A (en) * | 2018-07-10 | 2020-01-17 | Oppo广东移动通信有限公司 | Rectifier circuit, wireless charging device, power supply equipment and wireless charging system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111228 |
|
| CX01 | Expiry of patent term |