CN104979874A - Usb interface charging circuit - Google Patents
Usb interface charging circuit Download PDFInfo
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- CN104979874A CN104979874A CN201510402694.6A CN201510402694A CN104979874A CN 104979874 A CN104979874 A CN 104979874A CN 201510402694 A CN201510402694 A CN 201510402694A CN 104979874 A CN104979874 A CN 104979874A
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- charging circuit
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a USB interface charging circuit which comprises a USB joint, and an electrostatic protection circuit is connected between the D- pin and the D+ pin of the USB joint. The Vbus of the USB joint is connected on the anode of a first diode, and the cathode of the first diode is connected with the USB pin of a chip MAX 1551 and the cathode of the second diode. The anode of a second diode is connected with a power supply and a storage battery, and the /CHG pin of the chip MAX1551 is connected with a state display circuit and the BAT pin is connected with the power supply and connected on a second grounding capacitor. The DC pin of the MAX1551 is grounded. The USB interface charging circuit provides electrostatic protection, monitors charging state of the storage battery, prolongs the service lifetime of the storage battery and protects the storage battery.
Description
Technical field
The present invention relates to integrated circuit fields, particularly, relate to a kind of USB interface charging circuit.
Background technology
Along with the development of science and technology, increasing electronic product enters family, and in order to charge conveniently, the charging modes of USB interface is generally used, such as: the portable power source of USB joint.Along with the generally use of mobile phone, and modern more and more relies on mobile phone, and the application of the portable power source of USB joint is also very extensive, almost occurs the phenomenon of a staff portable power source in street or tourist attractions.It is very important for how realizing the reliable management of charge in batteries, effectively can not only improve the useful life of battery, and can protect storage battery, avoids outside interference.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of USB interface charging circuit, and it can protect electrostatic and monitor charge condition of battery, improves the useful life of storage battery, protects storage battery.
The present invention's adopted technical scheme that solves the problem is:
A kind of USB interface charging circuit, comprise USB joint, electrostatic discharge protection circuit is connected with between the D-pin of described USB joint and D+ pin, the Vbus pin of described USB joint is connected on the positive pole of the first diode, the negative pole of the first described diode is connected with the negative pole of the second diode with the USB pin of chip MAX1551 simultaneously, the positive pole of the second described diode is connected with storage battery with power supply simultaneously, described chip MAX1551 /CHG pin on be connected with status display circuit and BAT pin is connected to while being connected with power supply in the second ground capacity, the DC pin ground connection of described chip MAX1551.
In the fall or the dry season in winter, human body often produces electrostatic, and the power supply of USB joint takes, and electrostatic very easily acts on power supply.Utilize electrostatic discharge protection circuit to protect electrostatic from USB joint, avoid electrostatic to damage storage battery.Battery charging circuit adopts USB power source to power, and the input pin of the plant-grid connection chip MAX1551 of USB joint, charges to storage battery.Chip MAX1551 /CHG pin is state instruction pin, the charged state of utilization state display circuit to storage battery shows.After storage battery is full of, storage battery can be pulled up by the display of status display circuit, avoids the phenomenons such as overshoot, improves the useful life of battery, protects storage battery.
As preferably, described electrostatic discharge protection circuit comprises chip SN65220, and the A pin of described chip SN65220 and B pin are connected with D-pin with the D+ pin of USB joint respectively and are all connected with earth resistance.Electrostatic discharge protection circuit of the present invention utilizes chip SN65220 and peripheral circuit thereof to form, and it can realize the reliable protection to electrostatic.
As preferably, in order to further avoid external disturbance to the interference of charging circuit, the USB pin of described chip MAX1551 is connected with the first ground capacity.The first ground capacity is utilized to absorb external disturbance, the reliability of intensified charging circuit and fail safe.
As preferably, the first described diode and the second diode are 1N5391.
As preferably, observe intuitively for the ease of people to the charge and discharge state of storage battery, described status display circuit is LED display circuit.
To sum up, the invention has the beneficial effects as follows:
1, charging circuit of the present invention connects electrostatic discharge protection circuit in USB interface, and it protects the electrostatic acting on interface, improves the useful life of storage battery, protects storage battery.
2, the chip MAX1551 that utilizes of the present invention carries out the discharge and recharge of storage battery, and shows charged state, avoids storage battery to be overcharged, and extends the oil life-span of storage battery.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with embodiment and accompanying drawing, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
A kind of USB interface charging circuit as shown in Figure 1, comprise USB joint, electrostatic discharge protection circuit is connected with between the D-pin of described USB joint and D+ pin, the Vbus pin of described USB joint is connected on the positive pole of the first diode D1, the negative pole of the first described diode D1 is connected with the negative pole of the second diode D2 with the USB pin of chip MAX1551 simultaneously, the positive pole of the second described diode D2 is connected with storage battery POW with power supply simultaneously, described chip MAX1551 /CHG pin on be connected with status display circuit and BAT pin is connected to while being connected with power supply on the second ground capacity C2, the DC pin ground connection of described chip MAX1551.
Embodiment 2:
A kind of USB interface charging circuit as shown in Figure 1, the present embodiment has done refinement on the basis of above-described embodiment, namely described electrostatic discharge protection circuit comprises chip SN65220, and the A pin of described chip SN65220 and B pin are connected with D-pin with the D+ pin of USB joint respectively and are all connected with earth resistance.
The USB pin of described chip MAX1551 is connected with the first ground capacity C1.
The first described diode and the second diode are 1N5391.
Described status display circuit is LED display circuit.Status display circuit utilizes light-emitting diode D3 to realize.The negative pole of light-emitting diode D3 is connected to/CHG pin on, plus earth.When storage battery underfill ,/CHG pin is high-impedance state, and light-emitting diode D3 does not work.After storage battery is full of ,/CHG pin output low level, now light-emitting diode D3 lights.
First disclose one group of embodiment: the first ground capacity C1, the second ground capacity C2 all can adopt 0.1 μ F, the earth resistance of D+ pin and D-pin all adopts 20 kilo-ohms.
As mentioned above, the present invention can be realized preferably.
Claims (5)
1.USB interface charging circuit, comprise USB joint, it is characterized in that: between the D-pin of described USB joint and D+ pin, be connected with electrostatic discharge protection circuit, the Vbus pin of described USB joint is connected on the positive pole of the first diode, the negative pole of the first described diode is connected with the negative pole of the second diode with the USB pin of chip MAX1551 simultaneously, the positive pole of the second described diode is connected with storage battery with power supply simultaneously, described chip MAX1551 /CHG pin on be connected with status display circuit and BAT pin is connected to while being connected with power supply in the second ground capacity, the DC pin ground connection of described chip MAX1551.
2. USB interface charging circuit according to claim 1, it is characterized in that: described electrostatic discharge protection circuit comprises chip SN65220, the A pin of described chip SN65220 and B pin are connected with D-pin with the D+ pin of USB joint respectively and are all connected with earth resistance.
3. USB interface charging circuit according to claim 1, is characterized in that: the USB pin of described chip MAX1551 is connected with the first ground capacity.
4. USB interface charging circuit according to claim 1, is characterized in that: the first described diode and the second diode are 1N5391.
5. USB interface charging circuit according to claim 1, is characterized in that: described status display circuit is LED display circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510402694.6A CN104979874A (en) | 2015-07-10 | 2015-07-10 | Usb interface charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510402694.6A CN104979874A (en) | 2015-07-10 | 2015-07-10 | Usb interface charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104979874A true CN104979874A (en) | 2015-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510402694.6A Pending CN104979874A (en) | 2015-07-10 | 2015-07-10 | Usb interface charging circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN104979874A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3933603A1 (en) * | 2020-07-02 | 2022-01-05 | Infineon Technologies AG | An electrostatic discharge, esd, protection device for a universal serial bus, usb, interface |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100219790A1 (en) * | 2009-02-27 | 2010-09-02 | Fairchild Semiconductor Corporation | Peripheral device host charging |
| CN102055223A (en) * | 2009-11-03 | 2011-05-11 | 马克西姆综合产品公司 | USB special charger recognition circuit |
| CN204794206U (en) * | 2015-07-10 | 2015-11-18 | 成都市宏山科技有限公司 | USB interface charging circuit |
-
2015
- 2015-07-10 CN CN201510402694.6A patent/CN104979874A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100219790A1 (en) * | 2009-02-27 | 2010-09-02 | Fairchild Semiconductor Corporation | Peripheral device host charging |
| CN102055223A (en) * | 2009-11-03 | 2011-05-11 | 马克西姆综合产品公司 | USB special charger recognition circuit |
| CN204794206U (en) * | 2015-07-10 | 2015-11-18 | 成都市宏山科技有限公司 | USB interface charging circuit |
Non-Patent Citations (2)
| Title |
|---|
| 付蔚，张俊，刘锋: "手持终端测试仪中的两种供电方式设计", 《单片机与嵌入式系统应用》 * |
| 孟海斌，张红雨: "LPC2142的低功耗有源RFID手持机设计", 《单片机与嵌入式系统应用》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3933603A1 (en) * | 2020-07-02 | 2022-01-05 | Infineon Technologies AG | An electrostatic discharge, esd, protection device for a universal serial bus, usb, interface |
| US11670940B2 (en) | 2020-07-02 | 2023-06-06 | Infineon Technologies Ag | Electrostatic discharge, ESD, protection device for a Universal Serial Bus, USB, interface |
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| PB01 | Publication | ||
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Application publication date: 20151014 |