CN203135715U - Power-supply management circuit - Google Patents
Power-supply management circuit Download PDFInfo
- Publication number
- CN203135715U CN203135715U CN2013200722530U CN201320072253U CN203135715U CN 203135715 U CN203135715 U CN 203135715U CN 2013200722530 U CN2013200722530 U CN 2013200722530U CN 201320072253 U CN201320072253 U CN 201320072253U CN 203135715 U CN203135715 U CN 203135715U
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- CN
- China
- Prior art keywords
- pin
- circuit
- control chip
- load
- nsd
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The utility model discloses a power-supply management circuit comprising a control chip U1 consisting of an NSD pin, a DET pin and a GND pin. A load detection circuit is connected between the DET pin and the NSD pin of the control chip U1. Compared with the prior art, the advantages of the utility model are that only a load is connected and the circuit can operate because of the load detection circuit; when the load is not connected, the circuit is not in an operation state and in a standby state; very low battery energy is consumed, so that standby time of a battery is greatly increased; use is safer; when output is in a short circuit state, the battery passes by an inductor L1, a Schottky diode D1 and a resistor R1 and then is connected with the GND; because R1 resistance is relatively large, current is very small after short circuit appears and damage on external components and the lithium battery cannot appear; and the circuit is simple, the required components are few and cost is low.
Description
Technical field
The utility model belongs to electric power management circuit.
Background technology
One of existing power supply management circuit as shown in Figure 1, BAT connects the positive pole of battery, SW is the drain electrode of internal power NMOS, FB is that data go out pressure feedback port, R1 and R2 be used for to set output voltage.In scheme shown in Figure 1, the output of output Boost circuit directly is connected with load, because there is not load detecting circuit, so just there is not automatic closing function yet, namely no matter whether load is connected to OUT, and output Boost circuit all can be worked always, and output voltage OUT exists always.The existing power supply management circuit two as shown in Figure 2, anode BAT is connected with booster circuit by PMOS Q1, the grid of Q1 connects the collector electrode of NPN transistor Q2, the base stage of Q2 is subjected to the control of MCU U2; When load inserted, the BAT electric current to GND, can detect a small voltage so detect on the resistance R 1 through R6, load, R1, and this voltage is sent into MCU, and MCU exports control signal PWM again with the Q2 conducting, thereby makes the Q1 conducting, and booster circuit is started working.
For prior art one, mainly there are two problems: the one, because there is not load detecting circuit, when not having load to connect, circuit is still in running order, consume battery power reduces the stand-by time of battery greatly; The 2nd, output directly is connected with load, if output short-circuit, battery can pass through inductance L 1, Schottky diode D1 and ground short circuit so, not only can burn out inductance and Schottky diode, the danger that also there is burning in battery even explodes owing to heavy-current discharge, thereby in use have very big potential safety hazard.For prior art two, though load detecting circuit is arranged, the shortcoming that does not exist prior art one to face owing to used MCU and NPN transistor, makes that the application and development cost is higher, is unfavorable for low cost development.
The utility model content
The purpose of this utility model provides a kind of energy-conservation, safety, electric power management circuit that cost is low.
The technical scheme that realizes the employing of the utility model purpose is as follows:
The electric power management circuit that the utility model provides, comprise have the NSD pin, the control chip U1 of DET pin and GND pin, between the DET of described control chip U1 pin and NSD pin, be connected with load detecting circuit.
Described load detecting circuit is made up of MOS switching tube Q1 in the circuit and resistance R 1, wherein the drain electrode of MOS switching tube Q1 is connected with an end of resistance R 1 and the DET pin of control chip U1, grid connects the NSD pin of control chip U1, and source electrode is connected and ground connection with the other end of resistance R 1 and the GND pin of control chip U1.
Compared with prior art, advantage of the present utility model is:
1, because adopting load detecting circuit, only circuit just can be worked when load inserts, and when not having load to connect, circuit is in idle holding state, consumes the very low energy content of battery, increases the stand-by time of battery greatly;
2, use is safer, and when output short-circuit, battery can pass through inductance L 1, Schottky diode D1 and resistance R 1 to GND, because the R1 resistance is bigger, so the short circuit after-current is very little, can not damage outer member and lithium battery;
3, circuit is simple, and required components and parts are few, and cost is low.
Further specify the technical solution of the utility model below in conjunction with accompanying drawing.
Description of drawings
Fig. 1, Fig. 2 are respectively the circuit diagrams of prior art.
Fig. 3 is circuit diagram of the present utility model.
Embodiment
See Fig. 3, the utility model circuit comprises control chip U1, inductance L 1, Schottky diode D1, MOS switching tube Q1 and resistance R 1, R2, R3, filter capacitor C1; Lithium battery output voltage BAT connects an end of inductance L 1 and the VIN pin of control chip U1, the positive pole of an other termination Schottky diode D1 of inductance L 1 and the SW pin of control chip U1, the negative pole of Schottky diode D1, one end of resistance R 2, the positive pole of output filter capacitor C1 constitutes the output head anode OUT+ of this circuit, the grid of MOS switching tube Q1 connects the NSD pin of control chip U1, one end of drain electrode and resistance R 1 and the DET pin of control chip U1 constitute the output negative pole OUT-of this circuit, source electrode is connected and ground connection with the other end of resistance R 1 and the GND pin of control chip U1, the FB pin of the termination control chip U1 of the other end of resistance R 2 and R3, the other end ground connection of R3; MOS switching tube Q1 and resistance R 1 have constituted load detecting circuit in the circuit.
When not having load, the NSD pin output low level of control chip U1, MOS switching tube Q1 is turn-offed, the DET pin is connected with the GND pin by resistance R 1, so this moment, the voltage of DET pin was 0, entire circuit is not worked and is in low power consumpting state, and output cathode OUT+ voltage and the BAT voltage of circuit are almost equal.When load inserts, because this moment, MOS switching tube Q1 turn-offed, so the electric current that output cathode OUT+ arrives the GND pin again through overload can only arrive the GND pin again by resistance R 1, so the DET pin just can detect load and insert, thereby control NSD pin output high level, with MOS switching tube Q1 conducting, circuit begins operate as normal.After load removed, output cathode OUT+ voltage can begin to rise, and control chip U1 can detect this situation by the FB pin, thereby control NSD pin turn-offs MOS switching tube Q1, and circuit can enter the low-power consumption standby state again.If output short-circuit; the voltage of output cathode OUT+ can reduce, and control chip U1 also can detect the generation of short-circuit conditions by the FB pin, thereby control NSD pin turn-offs MOS switching tube Q1; and make control chip U1 enter shutdown mode, thereby protection outer member and lithium battery.
Claims (2)
1. electric power management circuit, comprise have the NSD pin, the control chip U1 of DET pin and GND pin, it is characterized in that between the DET of described control chip U1 pin and NSD pin, being connected with load detecting circuit.
2. electric power management circuit according to claim 1, it is characterized in that described load detecting circuit is made up of MOS switching tube Q1 and resistance R 1, wherein the drain electrode of MOS switching tube Q1 is connected with an end of resistance R 1 and the DET pin of control chip U1, grid connects the NSD pin of control chip U1, and source electrode is connected and ground connection with the other end of resistance R 1 and the GND pin of control chip U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200722530U CN203135715U (en) | 2013-02-11 | 2013-02-11 | Power-supply management circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200722530U CN203135715U (en) | 2013-02-11 | 2013-02-11 | Power-supply management circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203135715U true CN203135715U (en) | 2013-08-14 |
Family
ID=48943654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200722530U Expired - Lifetime CN203135715U (en) | 2013-02-11 | 2013-02-11 | Power-supply management circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203135715U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107702A (en) * | 2013-02-11 | 2013-05-15 | 湖南融和微电子有限公司 | Power source management circuit |
| CN107134922A (en) * | 2017-07-05 | 2017-09-05 | 郑州万用电子科技有限公司 | A kind of change-over circuit of instrument power supply |
-
2013
- 2013-02-11 CN CN2013200722530U patent/CN203135715U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107702A (en) * | 2013-02-11 | 2013-05-15 | 湖南融和微电子有限公司 | Power source management circuit |
| CN107134922A (en) * | 2017-07-05 | 2017-09-05 | 郑州万用电子科技有限公司 | A kind of change-over circuit of instrument power supply |
| CN107134922B (en) * | 2017-07-05 | 2023-10-31 | 郑州工业应用技术学院 | Conversion circuit of power supply for instrument |
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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: 20130814 |
|
| CX01 | Expiry of patent term |