CN102055233A - Power supply unit - Google Patents
Power supply unit Download PDFInfo
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- CN102055233A CN102055233A CN2009101883256A CN200910188325A CN102055233A CN 102055233 A CN102055233 A CN 102055233A CN 2009101883256 A CN2009101883256 A CN 2009101883256A CN 200910188325 A CN200910188325 A CN 200910188325A CN 102055233 A CN102055233 A CN 102055233A
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- triode
- divider resistance
- mosfet
- battery
- electrode
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- Dc-Dc Converters (AREA)
- Direct Current Feeding And Distribution (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention discloses a power supply unit, comprising a battery, a DC voltage converter, a dummy diode, a MOSFET and a triode, wherein an input end of the DC voltage converter is grounded by a first divider resistor and a second divider resistor; an output end of the DC voltage converter is electrically connected to a positive electrode of the dummy diode; a negative electrode of the dummy diode is connected to a drain electrode of the MOSFET; the source electrode of the MOSFET is connected to a positive electrode of the battery; a grid electrode of the MOSFET is connected to an emitting electrode of the triode; the emitting electrode of the triode is further grounded by a fourth divider resistor; a base of the triode is grounded by the second divider resistor; a collector of the triode is connected to the positive electrode of the dummy diode by a third divider resistor; the collector of the triode is grounded by a capacitor. The device realizes the stable switching between a power supply and the battery, and avoids the system resetting phenomenon caused by plugging the power supply.
Description
Technical field
The present invention relates to a kind of electric supply installation, particularly relate to a kind of power supply and battery and realize the steadily electric supply installation of switching.
Background technology
At present, battery and adapter and save as the standard configuration that system power supply is an electronic equipment such as mobile phone.DC (Direct Current, when DC level) inserting and extracting, since STEP UP (voltage increases progressively) working method of DCDC (transducers of DC-to-DC, different DC power supply values) and electric capacity discharge and recharge reason, the output of DCDC is not saltus step, therefore adopt the break-make of this DCDC output branch pressure-controlled battery can have switching problem, be that system's supply power voltage falls, especially when cell voltage was low, this falls can cause system reset.
Summary of the invention
The technical problem to be solved in the present invention is in order to overcome that adapter in the prior art inserts that supply power voltage when extracting falls and the defective that causes system reset, the electric supply installation that provides a kind of power supply and battery steadily to switch.
The present invention solves above-mentioned technical problem by following technical proposals:
A kind of electric supply installation, it comprises a battery, its characteristics are, it also comprises: a direct current electric pressure converter, one dummy diode, one MOSFET (metal oxide semiconductor field effect tube) and a triode, wherein, the input of this dc voltage changer is by one first divider resistance and one second divider resistance ground connection, the output of this dc voltage changer is electrically connected to the positive pole of a dummy diode, the negative pole of this dummy diode links to each other with the drain electrode of a MOSFET, the source electrode of this MOSFET links to each other with the positive pole of this battery, the grid of this MOSFET links to each other with the emitter of this triode, the emitter of this triode is also by one the 4th divider resistance ground connection, the base stage of this triode is by this second divider resistance ground connection, the collector electrode of this triode is connected to the positive pole of this dummy diode by one the 3rd divider resistance, and the collector electrode of this triode is by a capacity earth simultaneously.
Preferably, the resistance of the 3rd divider resistance and the 4th divider resistance is respectively 10K Ω and 100K Ω, and the capacitive reactance of this electric capacity is 220nF.
Positive progressive effect of the present invention is: the steady switching of the power supply that can realize and battery, especially in the low situation of cell voltage, avoid the system reset phenomenon that occurs because of the plug power supply, and the realization means are simple, and with low cost.
Description of drawings
Fig. 1 is the circuit structure diagram of electric supply installation of the present invention.
Embodiment
Provide preferred embodiment of the present invention below in conjunction with accompanying drawing, to describe technical scheme of the present invention in detail.
With reference to figure 1, be the circuit structure diagram of electric supply installation of the present invention.This electric supply installation comprises: a battery (V1=4.2V), be used for the daily power supply of mobile phone, this electric supply installation also comprises: direct current electric pressure converter (DCDC) A1, one dummy diode D1, one MOSFET (metal oxide semiconductor field effect tube) Q2 and a triode Q1, wherein, the input of this dc voltage changer is by one first divider resistance R1 and one second divider resistance R2 ground connection, the output of this dc voltage changer is electrically connected to the positive pole of a dummy diode D1, the negative pole of this dummy diode D1 links to each other with the drain electrode of a MOSFET, the source electrode of this MOSFET links to each other with the positive pole of this battery, the grid of this MOSFET links to each other with the emitter of this triode Q1, the emitter of this triode Q1 is also by one the 4th divider resistance R4 ground connection, the base stage of this triode Q1 is by this second divider resistance R2 ground connection, the collector electrode of this triode Q1 is connected to the positive pole of this dummy diode D1 by one the 3rd divider resistance R3, and the collector electrode of this triode Q1 is by a capacitor C 1 ground connection simultaneously.Suitably select the value of the 3rd divider resistance R3, the 4th divider resistance R4 and capacitor C 1, can realize inserting extracting not have and fall switching.In the present embodiment, the resistance of the 3rd divider resistance and the 4th divider resistance is respectively 10K Ω and 100K Ω, and the capacitive reactance of this electric capacity is 220nF.Also can select suitable resistance and capacitive reactance in this ratio.
This electric supply installation is to realize so steadily switching: only battery-powered when system, promptly adapter (ADAPTER) is not when DC12V inserts, and this triode Q1 ends, and this MOSFETQ2 is saturated, is system's power supply by battery through this MOSFETQ2; When adapter and battery are powered simultaneously, first, second divider resistance R1, R2 dividing potential drop make this triode Q1 saturated, electric pressure converter DCDC output makes its shutoff through the 3rd, the 4th divider resistance R3, R4, triode Q1 and 1 fen this MOSFETQ2 of pressure-controlled of capacitor C, and system is powered by DCDC.
Adapter is extracted moment, and triode Q1 turn-offs, and the grid of this MOSFETQ2 (G end) drags down by the 4th divider resistance R4, makes this MOSFETQ2 saturation conduction; When adapter inserts, because DCDC output has the voltage delivery increasing process, promptly export non-saltus step, MOSFETQ2 is by being conducting to by there being the unsaturated state interval simultaneously, this capacitor C 1 plays the effect of time delayed turn-off MOSFETQ2, guarantees when this MOSFETQ2 begins to turn-off, and DCDC has bigger output, substitute powered battery, reach the smooth transition that power supply inserts input voltage when extracting system.
Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these execution modes.Therefore, protection scope of the present invention is limited by appended claims.
Claims (2)
1. electric supply installation, it comprises a battery, it is characterized in that, it also comprises: a direct current electric pressure converter, one dummy diode, one MOSFET and a triode, wherein, the input of this dc voltage changer is by one first divider resistance and one second divider resistance ground connection, the output of this dc voltage changer is electrically connected to the positive pole of a dummy diode, the negative pole of this dummy diode links to each other with the drain electrode of a MOSFET, the source electrode of this MOSFET links to each other with the positive pole of this battery, the grid of this MOSFET links to each other with the emitter of this triode, the emitter of this triode is also by one the 4th divider resistance ground connection, the base stage of this triode is by this second divider resistance ground connection, the collector electrode of this triode is connected to the positive pole of this dummy diode by one the 3rd divider resistance, and the collector electrode of this triode is by a capacity earth simultaneously.
2. electric supply installation as claimed in claim 1 is characterized in that, the resistance of the 3rd divider resistance and the 4th divider resistance is respectively 10K Ω and 100K Ω, and the capacitive reactance of this electric capacity is 220nF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101883256A CN102055233A (en) | 2009-10-27 | 2009-10-27 | Power supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101883256A CN102055233A (en) | 2009-10-27 | 2009-10-27 | Power supply unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102055233A true CN102055233A (en) | 2011-05-11 |
Family
ID=43959304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101883256A Pending CN102055233A (en) | 2009-10-27 | 2009-10-27 | Power supply unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102055233A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672148A (en) * | 2019-02-21 | 2019-04-23 | 广州视源电子科技股份有限公司 | Overvoltage crowbar |
| CN112564258A (en) * | 2019-09-06 | 2021-03-26 | 株式会社京滨 | Power control device |
| CN114336893A (en) * | 2022-01-20 | 2022-04-12 | 德明通讯（上海）股份有限公司 | Path management circuit of lithium battery and adapter power supply |
-
2009
- 2009-10-27 CN CN2009101883256A patent/CN102055233A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672148A (en) * | 2019-02-21 | 2019-04-23 | 广州视源电子科技股份有限公司 | Overvoltage crowbar |
| CN112564258A (en) * | 2019-09-06 | 2021-03-26 | 株式会社京滨 | Power control device |
| CN112564258B (en) * | 2019-09-06 | 2023-08-25 | 日立安斯泰莫株式会社 | power control device |
| CN114336893A (en) * | 2022-01-20 | 2022-04-12 | 德明通讯（上海）股份有限公司 | Path management circuit of lithium battery and adapter power supply |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110511 |