CN204883583U

CN204883583U - A reverse big electricity charging system for intelligent terminal

Info

Publication number: CN204883583U
Application number: CN201520636679.3U
Authority: CN
Inventors: 刘静江; 郑雪瑞; 金超
Original assignee: Shanghai Chuanying Information Technology Co Ltd
Current assignee: Shanghai Chuanying Information Technology Co Ltd
Priority date: 2015-08-21
Filing date: 2015-08-21
Publication date: 2015-12-16
Anticipated expiration: 2025-08-21

Abstract

The utility model provides a reverse big electricity charging system for intelligent terminal, including CPU master control end and USB interface end, the D+ pin of this CPU master control end links to each other with the DP signal pin of USB interface end through a single -pole double -throw, and its D - pin is then link to each other with the DM signal pin of USB interface end through the 2nd single -pole double -throw to be provided with resistance between a single -pole double -throw and the 2nd single -pole double -throw, simultaneously, CPU master control end links to each other with the USB interface end through ID line, ground wire and ADC line are direct, CPU master control end links to each other with boost circuit through the control line, and boost circuit passes through the VBUS line and links to each other with the current detection chip, and the current detection chip still links to each other with the USB interface end, CPU master control end still links to each other with the current detection chip through the ADC line is direct. Owing to adopted above -mentioned technique, the utility model discloses finally realize reverse big electricity charging on USB2.0's basis, possessed advantages such as with low costs and practicality are strong.

Description

A kind of reverse large current charge system for intelligent terminal

Technical field

The utility model relates to smart machine field, particularly relates to a kind of reverse large current charge system for intelligent terminal.

Background technology

At present, existing panel computer nearly all has the function of OTG, uses conventional OTG line can realize panel computer to mobile terminal chargings such as mobile phones.

But, due to the restriction of USB2.0 agreement, externally can only export the electric current of 500mA, can not reach to the requirement of exterior terminal rapid charge.

Utility model content

In order to solve the little problem of above-mentioned electric current, the utility model provides a kind of reverse large current charge system for intelligent terminal, can realize reverse large current charge, and takes into account data transmission.

Above-mentioned a kind of reverse large current charge system for intelligent terminal, comprise CPU main control end and USB interface end, the D+ pin of described CPU main control end is connected with the DP signal pins of USB interface end by the first single-pole double-throw switch (SPDT), the D-pin of described CPU main control end is connected with the DM signal pins of USB interface end by the second single-pole double-throw switch (SPDT), is provided with resistance between described first single-pole double-throw switch (SPDT) and the second single-pole double-throw switch (SPDT);

Described CPU main control end is directly connected with USB interface end by ID line, ground wire and ADC line; Described CPU main control end is connected with booster circuit by control line, and described booster circuit is connected with current detecting chip by VBUS line, and described current detecting chip is also connected with USB interface end; Described CPU main control end is also directly connected with current detecting chip by ADC line.

In said system, the resistance of described resistance is 100 Ω.

In said system, the maximal value that described booster circuit exports after VBUS line is 50V/2.5A.

Advantage of the present utility model and beneficial effect are: the utility model provides a kind of reverse large current charge system for intelligent terminal, by adding the booster circuit of a 5V/2.5A, powers or reverse charging for external unit; Add two single-pole double-throw switch (SPDT)s, the D+/D-pin that can control panel computer USB interface is connected to CPU or D+/D-short circuit simultaneously; And add a current detecting chip, the output current of boost chip can be detected, finally on the basis of USB2.0, achieve reverse large current charge, possess the advantages such as cost is low and practical.

Accompanying drawing explanation

In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the structured flowchart of reverse large current charge system in the utility model.

Embodiment

Below in conjunction with drawings and Examples, embodiment of the present utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection domain of the present utility model with this.

As shown in Figure 1, the utility model describes a kind of reverse large current charge system for intelligent terminal, comprise CPU main control end 1 and USB interface end 2, the D+ pin 11 of this CPU main control end 1 is connected with the DP signal pins 21 of USB interface end 2 by the first single-pole double-throw switch (SPDT) 3, D-pin 12 is then connected with the DM signal pins 22 of USB interface end 2 by the second single-pole double-throw switch (SPDT) 4, and be provided with resistance 5 between the first single-pole double-throw switch (SPDT) 3 and the second single-pole double-throw switch (SPDT) 4, thus the short circuit between panel computer and CPU main control end 1 can be controlled;

Simultaneously, CPU main control end 1 is directly connected with USB interface end 2 by ID line 8, ground wire 9 and ADC line 10, what this ID line 8 transmitted is the interrupt trigger signal of OTG, and ADC line 10 transmission is the analog to digital conversion signal that current detecting chip 7 outputs to CPU main control end, as 12, VBUS line for transmitting the out-put supply of booster circuit 6.

In addition, CPU main control end 1 is connected with booster circuit 6 by control line 11, is mainly used in external unit and powers or reverse charging, and this booster circuit 6 is connected with current detecting chip 7 by VBUS line 12, the output current of booster circuit 6 can be detected, thus judged whether charging; Meanwhile, current detecting chip 7 is also connected with USB interface end 2.

Preferably, the resistance of above-mentioned resistance 5 is 100 Ω, and the output maximal value of booster circuit 6 is 50V/2.5A.

Further, above-mentioned CPU main control end 1 is also directly connected with current detecting chip 7 by ADC line 10.

In actual use, after peripheral hardware is inserted into panel computer, panel computer can be pointed out and allow user select, peripheral hardware is normal OTG equipment or only uses as reverse charging.If it is only reverse charging that user selects, now panel computer Engage of standard charger mode, can export the charging current required by peripheral hardware automatically, maximumly can reach 2.5A.Can galvanoscopy chip 7 according to the presence or absence of electric current, judge that peripheral hardware is extracted when reverse charging? if extracted, system reset, to normal USB pattern, waits for that next peripheral hardware uses.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims

1. the reverse large current charge system for intelligent terminal, comprise CPU main control end and USB interface end, it is characterized in that, the D+ pin of described CPU main control end is connected with the DP signal pins of USB interface end by the first single-pole double-throw switch (SPDT), the D-pin of described CPU main control end is connected with the DM signal pins of USB interface end by the second single-pole double-throw switch (SPDT), is provided with resistance between described first single-pole double-throw switch (SPDT) and the second single-pole double-throw switch (SPDT);

2. a kind of reverse large current charge system for intelligent terminal as claimed in claim 1, it is characterized in that, the resistance of described resistance is 100 Ω.

3. a kind of reverse large current charge system for intelligent terminal as claimed in claim 1, it is characterized in that, the output maximal value of described booster circuit is 50V/2.5A.