CN206341007U - A kind of POS charging circuit of dual power supply - Google Patents
A kind of POS charging circuit of dual power supply Download PDFInfo
- Publication number
- CN206341007U CN206341007U CN201621424985.1U CN201621424985U CN206341007U CN 206341007 U CN206341007 U CN 206341007U CN 201621424985 U CN201621424985 U CN 201621424985U CN 206341007 U CN206341007 U CN 206341007U
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- resistance
- power supply
- npn triode
- pos
- charging chip
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Abstract
The utility model is related to a kind of POS charging circuit of dual power supply, USB USB_5V and power supply adaptor DC_5V are isolated using a metal-oxide-semiconductor, when only accessing USB_5V, POS carries out low current charge, and when only accessing the DC_5V of power supply adaptor, POS carries out large current charge.Make POS charging more convenient, it is not necessary to which special power supply adaptor can also be charged.When quick charge can be carried out using power supply adaptor, the POS charging interval is reduced.
Description
Technical field
The utility model is related to a kind of POS charging circuit of dual power supply.
Background technology
At present, traditional POS generally uses power source special adaptor charge, and power source special adapter will increase cost, and
And if power supply adaptor loses the trouble that results in and can not charge.
The content of the invention
The purpose of this utility model is the POS charging circuit for providing a kind of dual power supply, to overcome prior art
Present in defect.
To achieve the above object, the technical solution of the utility model is：A kind of POS charging circuit of dual power supply,
Including a charging chip SD8001；The VCC ends of charging chip SD8001 DC_5V inputs respectively with power supply adaptor,
First resistor（R1）One end and second resistance（R2）One end is connected, and accesses the source electrode of a P-MOS pipes；The P-MOS pipes
Drain electrode respectively with USB_5V charging input ends, 3rd resistor（R3）One end and the 7th resistance one end are connected；The 3rd resistor
The other end be connected with the base stage of one first NPN triode；The colelctor electrode of first NPN triode is electric with described first respectively
Resistance（R1）The other end and the P-MOS pipes grid be connected；The grounded emitter of first NPN triode；Described
Seven resistance（R7）The other end be connected with the base stage of one second NPN triode；The colelctor electrode of second NPN triode respectively with
The second resistance（R2）The other end and the 6th resistance（R6）One end be connected；The emitter stage of second NPN triode
Ground connection；6th resistance（R6）The other end access one the 3rd NPN triode base stage；The collection of 3rd NPN triode
Electrode and one the 4th resistance（R4）One end be connected；4th resistance（R4）The other end and one the 5th resistance（R5）One end
It is connected, and accesses the PROG ends of the charging chip SD8001；5th resistance（R5）The other end and the 3rd NPN
The grounded emitter of triode；The GND ends ground connection of the charging chip SD8001；The BAT ends of the charging chip SD8001 with
One lithium battery anode is connected.
Compared to prior art, the utility model has the advantages that：The double electricity of one kind that the utility model is proposed
The POS charging circuit that source powers, can both use power supply adaptor power POS carry out large current charge, can also use
USB port POS of powering carries out low current charge, and simple in construction, charging is convenient.
Brief description of the drawings
Fig. 1 is a kind of circuit diagram of the POS charging circuit of dual power supply of the utility model.
Embodiment
Below in conjunction with the accompanying drawings, the technical solution of the utility model is specifically described.
The utility model provides a kind of POS charging circuit of dual power supply, as shown in figure 1, including a charging chip
SD8001；The VCC ends of charging chip SD8001 DC_5V inputs respectively with power supply adaptor, first resistor（R1）One
End and second resistance（R2）One end is connected, and accesses the source electrode of a P-MOS pipes；The drain electrode of the P-MOS pipes respectively with USB_
5V charging input ends, 3rd resistor（R3）One end and the 7th resistance one end are connected；The other end of the 3rd resistor and one
The base stage of one NPN triode is connected；The colelctor electrode of first NPN triode respectively with the first resistor（R1）The other end
And the grid of the P-MOS pipes is connected；The grounded emitter of first NPN triode；7th resistance（R7）It is another
One end is connected with the base stage of one second NPN triode；The colelctor electrode of second NPN triode respectively with the second resistance
（R2）The other end and the 6th resistance（R6）One end be connected；The grounded emitter of second NPN triode；Described 6th
Resistance（R6）The other end access one the 3rd NPN triode base stage；The colelctor electrode of 3rd NPN triode and one the 4th electricity
Resistance（R4）One end be connected；4th resistance（R4）The other end and one the 5th resistance（R5）One end be connected, and access institute
State charging chip SD8001 PROG ends；5th resistance（R5）The other end and the 3rd NPN triode transmitting
Pole is grounded；The GND ends ground connection of the charging chip SD8001；The BAT ends of the charging chip SD8001 and a lithium battery anode
It is connected.
In Fig. 1, when being charged using USB port, USB_5V has 5V voltages, and triode Q2 is led by resistance R3 current limlitings
Logical, Q2 C poles, which are changed into low level, turns on P-MOS pipes, so that DC_5V and charging chip U1 the 4th pin also has 5V voltages.
USB_5V provides 5V voltages turns on triode Q4 by R7 current limlitings again, and triode Q4 C poles, which are changed into low level, makes triode Q3
Cut-off.Resistance R4 is not just connected over the ground, and the current control pin PIN5 of charging chip only has R5 to connect over the ground, just carries out small electricity
Stream charges to lithium battery anode.
When using power supply adaptor DC_5V chargings, because electric current can not pass through P-MOS pipes Q1 so that Q2 and Q4 are cut
Only, DC_5V is turned on by R2 and R6 current limlitings Q3, and R4 is just connected over the ground.The current control pin PIN5 of charging chip passes through R4 pairs
Ground is connected, and is connected over the ground further through R5, and lithium battery anode is charged with regard to carrying out high current.
Above is preferred embodiment of the present utility model, all changes made according to technical solutions of the utility model are produced
Function without departing from technical solutions of the utility model scope when, belong to protection domain of the present utility model.
Claims (1)
1. the POS charging circuit of a kind of dual power supply, it is characterised in that including a charging chip SD8001；The charging
Chip SD8001 VCC ends DC_5V inputs respectively with power supply adaptor, first resistor（R1）One end and second resistance
（R2）One end is connected, and accesses the source electrode of a P-MOS pipes；The drain electrode of the P-MOS pipes respectively with USB_5V charging input ends,
Three resistance（R3）One end and the 7th resistance one end are connected；The base of the other end of the 3rd resistor and one first NPN triode
Extremely it is connected；The colelctor electrode of first NPN triode respectively with the first resistor（R1）The other end and the P-MOS pipe
Grid be connected；The grounded emitter of first NPN triode；7th resistance（R7）The other end and one the 2nd NPN
The base stage of triode is connected；The colelctor electrode of second NPN triode respectively with the second resistance（R2）The other end and
6th resistance（R6）One end be connected；The grounded emitter of second NPN triode；6th resistance（R6）The other end
Access the base stage of one the 3rd NPN triode；The colelctor electrode and one the 4th resistance of 3rd NPN triode（R4）One end phase
Even；4th resistance（R4）The other end and one the 5th resistance（R5）One end be connected, and access the charging chip
SD8001 PROG ends；5th resistance（R5）The other end and the 3rd NPN triode grounded emitter；It is described
Charging chip SD8001 GND ends ground connection；The BAT ends of the charging chip SD8001 are connected with a lithium battery anode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621424985.1U CN206341007U (en) | 2016-12-23 | 2016-12-23 | A kind of POS charging circuit of dual power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621424985.1U CN206341007U (en) | 2016-12-23 | 2016-12-23 | A kind of POS charging circuit of dual power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206341007U true CN206341007U (en) | 2017-07-18 |
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ID=59302246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621424985.1U Active CN206341007U (en) | 2016-12-23 | 2016-12-23 | A kind of POS charging circuit of dual power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206341007U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107492882A (en) * | 2017-08-24 | 2017-12-19 | 郑州云海信息技术有限公司 | More power supplys supply under single load Anti-leakage circuit and its system between more power supplys |
-
2016
- 2016-12-23 CN CN201621424985.1U patent/CN206341007U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107492882A (en) * | 2017-08-24 | 2017-12-19 | 郑州云海信息技术有限公司 | More power supplys supply under single load Anti-leakage circuit and its system between more power supplys |
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