CN204258345U - A kind of low-power consumption BUCK type DC-DC power source charging circuit - Google Patents
A kind of low-power consumption BUCK type DC-DC power source charging circuit Download PDFInfo
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- CN204258345U CN204258345U CN201420614891.5U CN201420614891U CN204258345U CN 204258345 U CN204258345 U CN 204258345U CN 201420614891 U CN201420614891 U CN 201420614891U CN 204258345 U CN204258345 U CN 204258345U
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Abstract
The utility model discloses a kind of low-power consumption BUCK type DC-DC power source charging circuit, comprise direct current input interface, DC-DC conversion chip and for galvanic direct current output interface after exporting transformation, draw together trigger switch K1, PNP type triode Q1, described trigger switch K1 is connected between the EN pin of DC-DC conversion chip and the anode connection terminal Vin+ of direct current input interface; The base stage of triode Q1 connects the negative pole of diode D2, and emitter connects the positive pole of diode D2, and collector electrode is connected between the EN pin of trigger switch K1 and DC-DC conversion chip by diode D1.The utility model is started by trigger switch K1, and triode Q1 conducting makes the Enable Pin of DC-DC conversion chip keep high level, and circuit charges normal; When do not connect use electric loading time, triode Q1 cut-off makes the Enable Pin of DC-DC conversion chip be low level, realizes power-saving control function thus.
Description
Technical field
The utility model relates to a kind of power charging circuit, particularly relates to a kind of low-power consumption BUCK type DC-DC power source charging circuit.
Background technology
Along with the raising of people's living standard, various digital products gets more and more, along with the function of large-size screen monitors smart mobile phone, panel computer increases, act on increasing, use also further frequent, the service time of battery is just shorter and shorter, may run into the digital products such as mobile phone and not have electricity, out of doors for digital product charging just be unable to do without portable power source.Present portable power source be usually built-in with high voltage large capcity battery pack and for adjusting voltage to export the charging circuit of adaptive cellular phone power supplies, charging circuit generally includes BUCK type DC-DC converter, but power supply come what may, itself charging circuit has from power consumption, if long-time not for battery charges, the power consumption of circuit itself easily causes battery to cross to put and cause cell damage, makes battery cannot recover to use, greatly reduces the life-span of battery.
Therefore, under the ever-increasing overall situation of battery utilization rate, how reducing power supply without the power consumption under external electricity consumption loading condition is a problem needing solution badly.
Utility model content
For overcoming the deficiencies in the prior art, the purpose of this utility model is to provide a kind of low-power consumption BUCK type DC-DC power source charging circuit, reduce portable power source under non-charged state from power consumption.
The utility model is the technical scheme solving the employing of its technical problem:
A kind of low-power consumption BUCK type DC-DC power source charging circuit, comprise direct current input interface, DC-DC conversion chip and for galvanic direct current output interface after exporting transformation, the anode connection terminal Vin+ of direct current input interface is connected with the IN pin of DC-DC conversion chip, the SW pin of DC-DC conversion chip is by inductance L 1, diode D2 is connected with the anode connection terminal of direct current output interface, the negative pole link Vin-of direct current input interface is connected with the negative pole link of direct current output interface, also comprise trigger switch K1, PNP type triode Q1, described trigger switch K1 is connected between the EN pin of DC-DC conversion chip and the anode connection terminal Vin+ of direct current input interface, the base stage of triode Q1 connects the negative pole of diode D2, and emitter connects the positive pole of diode D2, and collector electrode is connected between the EN pin of trigger switch K1 and DC-DC conversion chip by diode D1.
Further, also comprise NPN type triode Q2, the base stage of described triode Q2 is connected with the negative pole link of direct current output interface, and emitter is connected with the negative pole link Vin-of direct current input interface, and collector electrode is connected with the anode connection terminal of direct current output interface by resistance R7, resistance R8.
Further, described inductance L 1 is connected with the negative pole link Vin-of direct current input interface by resistance R3, resistance R4, and the FB pin of described DC-DC conversion chip is connected between resistance R3 and resistance R4.
Further, the COMP pin of described DC-DC conversion chip is connected with the negative pole link Vin-of direct current input interface by electric capacity C4, resistance R2.
Further, the SS pin of described DC-DC conversion chip is connected with the negative pole link Vin-of direct current input interface by electric capacity R3.
Further, the BS pin of described DC-DC conversion chip is connected with SW pin by electric capacity C6.
Further, described direct current output interface is USB interface, and the positive pole VCC of USB interface is as the anode connection terminal of direct current output interface, and negative pole GND is as the negative pole link of direct current output interface.
Further, the D+ pin of described USB interface is connected between resistance R7 and resistance R8, and the D-pin of USB interface and D+ pin also connect.
The beneficial effects of the utility model are: the utility model starts the work of DC-DC conversion chip by trigger switch K1, and now triode Q1 conducting makes the Enable Pin EN pin of DC-DC conversion chip keep high level, and circuit maintains normal charged state; When direct current output interface be not connected to use electric loading time, triode Q1 cut-off makes the Enable Pin EN pin of DC-DC conversion chip be low level input, realize thus without power-saving control function during external electric loading.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and example, the utility model is described further.
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
With reference to Fig. 1, a kind of low-power consumption BUCK type DC-DC power source charging circuit of the present utility model, comprises direct current input interface 1, DC-DC conversion chip 2 and for galvanic direct current output interface 3 after exporting transformation; The anode connection terminal Vin+ of direct current input interface 1 is connected with the IN pin of DC-DC conversion chip 2, and the negative pole link Vin-of direct current input interface 1 is connected with the negative pole link of direct current output interface 3.In the present embodiment, DC-DC conversion chip 2 adopts model to be the BUCK type dc-dc of MP1482, and the SW pin of DC-DC conversion chip 2 is switching signal output, and it is connected with the anode connection terminal of direct current output interface 3 by inductance L 1, diode D2; The COMP pin of described DC-DC conversion chip 2 is compensating signal input, and it is connected with the negative pole link Vin-of direct current input interface 1 by electric capacity C4, resistance R2; SS pin is soft start input, and it is connected with the negative pole link Vin-of direct current input interface 1 by electric capacity R3; BS pin is that gate boost drives input, and it is connected with SW pin by electric capacity C6.
The utility model is provided with trigger switch K1, PNP type triode Q1, and described trigger switch K1 is connected between the Enable Pin EN pin of DC-DC conversion chip 2 and the anode connection terminal Vin+ of direct current input interface 1; The base stage of triode Q1 connects the negative pole of diode D2 by resistance R6, emitter connects the positive pole of diode D2, collector electrode is connected between the EN pin of trigger switch K1 and DC-DC conversion chip 2 by diode D1, is connected with resistance R5 between the emitter of triode Q1 and resistance R6.
The utility model is also provided with NPN type triode Q2, the base stage of described triode Q2 is connected with the negative pole link of direct current output interface 3, emitter is connected with the negative pole link Vin-of direct current input interface 1, and collector electrode is connected with the anode connection terminal of direct current output interface 3 by resistance R7, resistance R8.Described inductance L 1 is connected with the negative pole link Vin-of direct current input interface 1 by resistance R3, resistance R4, and the FB pin of described DC-DC conversion chip 2 is connected between resistance R3 and resistance R4.
Described direct current output interface 3 is USB interface, the positive pole VCC of USB interface is as the anode connection terminal of direct current output interface 3, negative pole GND is as the negative pole link of direct current output interface 3, in other embodiments, also can adopt the interface of other types, the utility model does not do specific requirement.In the present embodiment, the D+ pin of described USB interface is connected between resistance R7 and resistance R8, and the D-pin of USB interface and D+ pin also connect.
Operation principle of the present utility model and process as follows:
After by electric loading access USB interface, press trigger switch K1, trigger the EN Enable Pin of DC-DC conversion chip 2, DC-DC conversion chip 2 is started working;
The SW pin output transform voltage of DC-DC conversion chip 2, the base voltage of PNP type triode Q1 is made to be less than emitter voltage, i.e. triode Q1 conducting, and then input lasting high level to the EN Enable Pin of DC-DC conversion chip, circuit maintains normal charged state;
The voltage of the negative pole link output of USB interface makes base stage and the emitter forward of NPN type triode, i.e. triode Q2 conducting, and resistance R7, R8 produce detection signal to mobile phone, and mobile phone enters normal charged state;
Pull out with after electric loading from USB interface, circuitry consumes reduces, and the pressure drop of resistance R5, R6 diminishes, triode Q1 ends, the EN Enable Pin of DC-DC conversion chip becomes low level, makes DC-DC conversion chip be in resting state, realizes thus without power-saving control function during external electric loading.
The above, just preferred embodiment of the present utility model, the utility model is not limited to above-mentioned execution mode, as long as it reaches technique effect of the present utility model with identical means, all should belong to protection range of the present utility model.
Claims (8)
1. a low-power consumption BUCK type DC-DC power source charging circuit, comprise direct current input interface (1), DC-DC conversion chip (2) and for galvanic direct current output interface (3) after exporting transformation, the anode connection terminal Vin+ of direct current input interface (1) is connected with the IN pin of DC-DC conversion chip (2), the SW pin of DC-DC conversion chip (2) is by inductance L 1, diode D2 is connected with the anode connection terminal of direct current output interface (3), the negative pole link Vin-of direct current input interface (1) is connected with the negative pole link of direct current output interface (3), it is characterized in that: also comprise trigger switch K1, PNP type triode Q1, described trigger switch K1 is connected between the EN pin of DC-DC conversion chip (2) and the anode connection terminal Vin+ of direct current input interface (1), the base stage of triode Q1 connects the negative pole of diode D2, and emitter connects the positive pole of diode D2, and collector electrode is connected between the EN pin of trigger switch K1 and DC-DC conversion chip (2) by diode D1.
2. a kind of low-power consumption BUCK type DC-DC power source charging circuit according to claim 1, it is characterized in that: also comprise NPN type triode Q2, the base stage of described triode Q2 is connected with the negative pole link of direct current output interface (3), emitter is connected with the negative pole link Vin-of direct current input interface (1), and collector electrode is connected with the anode connection terminal of direct current output interface (3) by resistance R7, resistance R8.
3. a kind of low-power consumption BUCK type DC-DC power source charging circuit according to claim 1, it is characterized in that: described inductance L 1 is connected with the negative pole link Vin-of direct current input interface (1) by resistance R3, resistance R4, and the FB pin of described DC-DC conversion chip (2) is connected between resistance R3 and resistance R4.
4. a kind of low-power consumption BUCK type DC-DC power source charging circuit according to claim 1, is characterized in that: the COMP pin of described DC-DC conversion chip (2) is connected with the negative pole link Vin-of direct current input interface (1) by electric capacity C4, resistance R2.
5. a kind of low-power consumption BUCK type DC-DC power source charging circuit according to claim 1, is characterized in that: the SS pin of described DC-DC conversion chip (2) is connected with the negative pole link Vin-of direct current input interface (1) by electric capacity R3.
6. a kind of low-power consumption BUCK type DC-DC power source charging circuit according to claim 1, is characterized in that: the BS pin of described DC-DC conversion chip (2) is connected with SW pin by electric capacity C6.
7. according to the arbitrary described a kind of low-power consumption BUCK type DC-DC power source charging circuit of claim 1-6, it is characterized in that: described direct current output interface (3) is USB interface, the positive pole VCC of USB interface is as the anode connection terminal of direct current output interface (3), and negative pole GND is as the negative pole link of direct current output interface (3).
8. a kind of low-power consumption BUCK type DC-DC power source charging circuit according to claim 7, is characterized in that: the D+ pin of described USB interface is connected between resistance R7 and resistance R8, and the D-pin of USB interface and D+ pin also connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420614891.5U CN204258345U (en) | 2014-10-21 | 2014-10-21 | A kind of low-power consumption BUCK type DC-DC power source charging circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420614891.5U CN204258345U (en) | 2014-10-21 | 2014-10-21 | A kind of low-power consumption BUCK type DC-DC power source charging circuit |
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| CN204258345U true CN204258345U (en) | 2015-04-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108173422A (en) * | 2018-01-24 | 2018-06-15 | 深圳市朗仁科技有限公司 | The anti-point sparking reset circuit of vehicular data acquisition box |
| CN108255053A (en) * | 2018-03-15 | 2018-07-06 | 福建师范大学 | A kind of computer high-precision time service device |
-
2014
- 2014-10-21 CN CN201420614891.5U patent/CN204258345U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108173422A (en) * | 2018-01-24 | 2018-06-15 | 深圳市朗仁科技有限公司 | The anti-point sparking reset circuit of vehicular data acquisition box |
| CN108173422B (en) * | 2018-01-24 | 2024-04-12 | 深圳市云伽智能技术有限公司 | Ignition-prevention reset circuit of automobile data acquisition box |
| CN108255053A (en) * | 2018-03-15 | 2018-07-06 | 福建师范大学 | A kind of computer high-precision time service device |
| CN108255053B (en) * | 2018-03-15 | 2023-04-18 | 福建师范大学 | Computer high accuracy time service device |
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