CN208862634U - A kind of power supply switching power supply circuit - Google Patents

A kind of power supply switching power supply circuit Download PDF

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Publication number
CN208862634U
CN208862634U CN201821815129.8U CN201821815129U CN208862634U CN 208862634 U CN208862634 U CN 208862634U CN 201821815129 U CN201821815129 U CN 201821815129U CN 208862634 U CN208862634 U CN 208862634U
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China
Prior art keywords
triode
power supply
resistance
pmos tube
supply circuit
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CN201821815129.8U
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Chinese (zh)
Inventor
张振河
林立
许志龙
郑瑞斌
林灵敏
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Ryd Electronic Technology Co Ltd
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Ryd Electronic Technology Co Ltd
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Priority to CN201821815129.8U priority Critical patent/CN208862634U/en
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Abstract

The utility model relates to circuit fields.The utility model discloses a kind of power supplys to switch power supply circuit, including diode D1, triode Q1, triode Q2, triode Q4, triode Q5 and PMOS tube Q3, the positive termination DC power supply of diode D1, negative terminal connects the output end of power supply switching power supply circuit, the drain electrode of PMOS tube Q3 connects battery supply, source electrode connects the output end of power supply switching power supply circuit, gate series resistance R6 ground connection, the input pole of triode Q1 connects the source electrode of PMOS tube Q3, output stage series resistance R1 ground connection, base stage and output stage connect the base stage of triode Q4 simultaneously, the input pole of triode Q4 connects battery supply, output stage is sequentially connected in series resistance R2 and R3 ground connection, the input pole of triode Q5 connects DC power supply, output stage connects the input pole of triode Q2, the output of the triode Q2 Pole ground connection, the node between base stage connecting resistance R2 and R3, the output stage and base stage of triode Q5 connect the grid of PMOS tube Q3 simultaneously.The utility model battery power supply efficiency is high, switches voltage stabilization.

Description

A kind of power supply switching power supply circuit
Technical field
The utility model relates to circuit fields, switch power supply circuit more particularly to a kind of power supply.
Background technique
Electronic equipment all charged pools are powered mostly at present, in order to guarantee electrical stability, battery supply and direct current Source is host supplying power together, and the voltage of DC power supply is greater than the power supply of battery supply, in existing power supply circuit, battery supply Only one diode is as isolation, and for preventing when DC power supply is powered, the electric current of DC power supply flows backward onto battery, damage Bad battery;But when battery supply power supply, diode can generate extra energy consumption;Reduce the power supply effect of battery Rate will cause the instant power-down of output voltage, to back-end host in addition, existing switching circuit is not fast enough in the speed of switching Power supply impacts.
Summary of the invention
The purpose of this utility model is to provide a kind of power supply switching power supply circuits to ask to solve above-mentioned technology Topic.
To achieve the above object, the technical solution adopted in the utility model are as follows: a kind of power supply switching power supply circuit, including two Pole pipe D1, triode Q1, triode Q2, triode Q4, triode Q5 and the PMOS tube Q3 with parasitic diode, the diode The positive termination DC power supply of D1, the negative terminal of the diode D1 connect the output end of power supply switching power supply circuit, the PMOS tube The drain electrode of Q3 connects battery supply, and the source electrode of the PMOS tube Q3 connects the output end of power supply switching power supply circuit, the PMOS tube The gate series resistance R6 of Q3 is grounded, and the input pole of the triode Q1 connects the source electrode of PMOS tube Q3, and the triode Q1's is defeated Series resistance R1 in pole is grounded out, and the base stage and output stage of the triode Q1 connect the base stage of triode Q4, the triode simultaneously The input pole of Q4 connects battery supply, and the output stage of the triode Q4 is sequentially connected in series resistance R2 and R3 ground connection, the triode Q5 Input pole connect DC power supply, the output stage of the triode Q5 connects the input pole of triode Q2, the output of the triode Q2 Pole ground connection, the node between base stage the connecting resistance R2 and R3 of the triode Q2, the output stage and base stage of triode Q5 connect simultaneously The grid of PMOS tube Q3.
Further, the triode Q1, triode Q4 and triode Q5 are NPN triode, and triode Q2 is tri- pole PNP Pipe.
It further, further include capacitor C1, which switches the output end series capacitance C1 ground connection of power supply circuit.
It further, further include resistance R4, the input pole series resistance R4 of the triode Q5 is followed by DC power supply.
It further, further include resistance R5, the resistance R5 is serially connected between the grid of PMOS tube Q3 and resistance R6, institute State the output stage and base stage node between connecting resistance R5 and R6 simultaneously of triode Q5.
Further, the resistance value of the resistance R4, resistance R5 and resistance R6 are respectively 2.2K Ω, 100 Ω and 2M Ω.
Further, the resistance value of the resistance R2 and R3 is respectively 100 Ω and 2M Ω.
The advantageous effects of the utility model:
The power supply of the utility model switches power supply circuit, and quick power switching ensure that the stability of output voltage, and electricity Pond service efficiency is high, can also prevent electric current from flowing backward, and protects battery.
The utility model only needs simple electronic component, has the advantages of simple structure and easy realization, at low cost.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model specific embodiment.
Specific embodiment
Now in conjunction with the drawings and specific embodiments, the present invention will be further described.
As shown in Figure 1, a kind of power supply switches power supply circuit, including diode D1, triode Q1, triode Q2, triode Q4, triode Q5 and PMOS tube Q3 with parasitic diode, in this specific embodiment, the triode Q1, triode Q4 and three Pole pipe Q5 is preferably NPN triode, and triode Q2 is preferably PNP triode, and but it is not limited to this, in other embodiments, three Pole pipe Q1, triode Q4 and triode Q5 are also possible to PNP triode or metal-oxide-semiconductor etc., and triode Q2 is also possible to NPN triode Or metal-oxide-semiconductor etc., this is that those skilled in the art can realize easily, is no longer described in detail.
The positive termination DC power supply VCC of the diode D1, in this specific embodiment, the voltage of DC power supply VCC is 5V, But it is not limited to this, and the negative terminal of the diode D1 meets the output end vo ut, the PMOS tube Q3 of power supply switching power supply circuit Drain electrode meet battery supply VCC4V2, in this specific embodiment, the voltage of battery supply VCC4V2 is 4.2V, but is not limited to This.
The source electrode of the PMOS tube Q3 meets the output end vo ut of power supply switching power supply circuit, which switches power supply circuit Output end vo ut series capacitance C1 ground connection, the out-put supply of output end vo ut is filtered, improve out-put supply stability, In this specific embodiment, the capacitance of capacitor C1 is 100nF.
The grid of the PMOS tube Q3 is sequentially connected in series resistance R5 and R6 and is grounded, in this specific embodiment, resistance R5's and R6 Resistance value is respectively 100 Ω and 2M Ω, and but it is not limited to this.
The emitter (input pole) of the PNP triode Q1 connects the source electrode of PMOS tube Q3, the current collection of the PNP triode Q1 Pole (output stage) series resistance R1 is grounded, and in this specific embodiment, the resistance value of resistance R1 is preferably 2M Ω, and but it is not limited to this, The base stage and collector of the PNP triode Q1 connects the base stage of PNP triode Q4, the emitter of the PNP triode Q4 simultaneously (input pole) meets battery supply VCC4V2, and the collector (output stage) of the PNP triode Q4 is sequentially connected in series resistance R2 and R3 and connects Ground, in this specific embodiment, the resistance value of resistance R2 and R3 are respectively 100 Ω and 2M Ω, and but it is not limited to this.
Emitter (input pole) series resistance R4 of the PNP triode Q5 connects DC power supply VCC, this specific embodiment In, the resistance value of resistance R4 is preferably 2.2K Ω, and but it is not limited to this.The collector (output stage) of the PNP triode Q5 meets NPN The collector (input pole) of triode Q2, emitter (output stage) ground connection of the NPN triode Q2, the NPN triode Q2 Base stage connecting resistance R2 and R3 between node, the collector and base stage of PNP triode Q5 are simultaneously between connecting resistance R5 and R6 Node.
In this specific embodiment, the model of PMOS tube Q3 is preferably 2SJ517, certainly, in other embodiments, PMOS tube Q3 can also realize that this is that those skilled in the art can realize easily using the PMOS tube of other models, no longer describe in detail.
The course of work:
When DC power supply VCC has electricity, DC power supply VCC is exported through output end vo ut to host supplying power by diode D1, this When PMOS tube Q3 disconnect, prevent electric current from flowing backward and give battery supply VCC4V2, protect battery.
When DC power supply VCC disconnects moment, battery supply VCC4V2 passes through the parasitic diode and output end of PMOS tube Q3 Vout forming circuit, NPN triode Q4 conducting, is connected NPN triode Q2, and quick release falls the electricity on the grid of PMOS tube Q3 Amount, so that the voltage of the source electrode of PMOS tube Q3 is greater than grid voltage, PMOS tube Q3 fast conducting is passed through by battery supply VCC4V2 It is host supplying power that PMOS tube Q3, which supplies electricity to output end vo ut, and quick power switching ensure that the stability of output voltage, and due to There is no diode presence on battery supply VCC4V2 current supply circuit, battery availability factor is high.
The utility model only needs simple electronic component, such as triode, metal-oxide-semiconductor, diode.Resistance and capacitor, structure letter It is single, it is easy to accomplish, it is at low cost.
Although specifically showing and describing the utility model in conjunction with preferred embodiment, those skilled in the art is answered This is understood, in the spirit and scope for not departing from the utility model defined by the appended claims, in form and details On the utility model can be made a variety of changes, be the protection scope of the utility model.

Claims (7)

1. a kind of power supply switches power supply circuit, it is characterised in that: including diode D1, triode Q1, triode Q2, triode The positive termination DC power supply of Q4, triode Q5 and PMOS tube Q3, the diode D1 with parasitic diode, the diode D1 Negative terminal connect the output end of power supply switching power supply circuit, the drain electrode of the PMOS tube Q3 meets battery supply, the PMOS tube Q3 Source electrode connect the power supply switching power supply circuit output end, the PMOS tube Q3 gate series resistance R6 ground connection, three pole The input pole of pipe Q1 meets the source electrode of PMOS tube Q3, the output stage series resistance R1 ground connection of the triode Q1, the triode Q1 Base stage and output stage connect the base stage of triode Q4 simultaneously, the input pole of the triode Q4 connects battery supply, the triode The output stage of Q4 is sequentially connected in series resistance R2 and R3 ground connection, and the input pole of the triode Q5 meets DC power supply, the triode Q5 Output stage connect the input pole of triode Q2, the output stage ground connection of the triode Q2, the base stage connecting resistance of the triode Q2 Node between R2 and R3, the output stage and base stage of triode Q5 connect the grid of PMOS tube Q3 simultaneously.
2. power supply according to claim 1 switches power supply circuit, it is characterised in that: the triode Q1, triode Q4 and Triode Q5 is NPN triode, and triode Q2 is PNP triode.
3. power supply according to claim 1 or 2 switches power supply circuit, it is characterised in that: further include capacitor C1, which cuts Change the output end series capacitance C1 ground connection of power supply circuit.
4. power supply according to claim 3 switches power supply circuit, it is characterised in that: further include resistance R4, the triode The input pole series resistance R4 of Q5 is followed by DC power supply.
5. power supply according to claim 4 switches power supply circuit, it is characterised in that: it further include resistance R5, the resistance R5 Be serially connected between the grid of PMOS tube Q3 and resistance R6, the output stage and base stage of the triode Q5 simultaneously connecting resistance R5 and R6 it Between node.
6. power supply according to claim 5 switches power supply circuit, it is characterised in that: the resistance R4, resistance R5 and resistance The resistance value of R6 is respectively 2.2K Ω, 100 Ω and 2M Ω.
7. power supply according to claim 6 switches power supply circuit, it is characterised in that: the resistance value of the resistance R2 and R3 is distinguished For 100 Ω and 2M Ω.
CN201821815129.8U 2018-11-06 2018-11-06 A kind of power supply switching power supply circuit Active CN208862634U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821815129.8U CN208862634U (en) 2018-11-06 2018-11-06 A kind of power supply switching power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821815129.8U CN208862634U (en) 2018-11-06 2018-11-06 A kind of power supply switching power supply circuit

Publications (1)

Publication Number Publication Date
CN208862634U true CN208862634U (en) 2019-05-14

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Application Number Title Priority Date Filing Date
CN201821815129.8U Active CN208862634U (en) 2018-11-06 2018-11-06 A kind of power supply switching power supply circuit

Country Status (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111769541A (en) * 2020-07-29 2020-10-13 深圳市绿联科技有限公司 Power supply circuit, terminal accessory and method for preventing voltage backflow

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111769541A (en) * 2020-07-29 2020-10-13 深圳市绿联科技有限公司 Power supply circuit, terminal accessory and method for preventing voltage backflow
CN111769541B (en) * 2020-07-29 2022-03-15 深圳市绿联科技股份有限公司 Power supply circuit, terminal accessory and method for preventing voltage backflow

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