TWI386784B - Usb charge system - Google Patents

Usb charge system Download PDF

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Publication number
TWI386784B
TWI386784B TW97143210A TW97143210A TWI386784B TW I386784 B TWI386784 B TW I386784B TW 97143210 A TW97143210 A TW 97143210A TW 97143210 A TW97143210 A TW 97143210A TW I386784 B TWI386784 B TW I386784B
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TW
Taiwan
Prior art keywords
usb
serial bus
universal serial
charging
charging system
Prior art date
Application number
TW97143210A
Other languages
Chinese (zh)
Other versions
TW201019086A (en
Inventor
Jony Tsai
Original Assignee
Inventec Besta Co Ltd
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Filing date
Publication date
Application filed by Inventec Besta Co Ltd filed Critical Inventec Besta Co Ltd
Priority to TW97143210A priority Critical patent/TWI386784B/en
Publication of TW201019086A publication Critical patent/TW201019086A/en
Application granted granted Critical
Publication of TWI386784B publication Critical patent/TWI386784B/en

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Description

Universal Serial Bus (USB) Charging System

The invention relates to a universal serial bus (USB) charging system, in particular to a signal level using a USB identification pin (ID pin) to determine whether the USB connector is used for data transmission or power input, and to adjust the charging mode. The corresponding impedance of the set end of the group.

With the development of information, portable electronic devices are becoming more and more popular. The power supply of these electronic devices is usually supplied by an internal lithium battery. The user must use the device by charging the lithium battery. The general electronic device utilizes each The external charger manufactured by the manufacturer charges the lithium battery, and the user must carry the charger of each manufacturer for different products, which causes inconvenience to the user.

At present, the universal serial bus (USB) has been widely installed in computer systems and electronic devices, and the computer is connected to the electronic device through a universal serial bus, which can transmit data and supply power to the electronic device. Generally, USB provides 500 mA. If the current exceeds, it will usually be powered by external power. However, many electronic devices only leave the USB port and the power socket is omitted. Therefore, the USB port must distinguish between data transmission or power input. A dual power input and a single power input charging chip (IC) have been designed on the market for this problem. However, the dual power charging IC is more expensive than the single input charging chip, resulting in an increase in the cost of the portable electronic device.

In view of the above-mentioned problems of the prior art, it is an object of the present invention to provide a universal serial bus (USB) charging system to achieve the effect of automatically determining the type of USB application and adjusting the charging current.

Another object of the present invention is to provide a universal serial bus (USB) charging system that achieves the cost-effectiveness of using a single input charging chip.

In order to achieve the above object, the present invention provides a universal serial bus (USB) charging system including a charging module, a USB connector having an ID pin, a switching element, and a plurality of impedance elements. One end of each of the plurality of impedance elements is electrically connected to the set end of the charging module, and the other end is electrically connected to the switching element. The switching element selectively causes the plurality of elements to be generated according to the signal of the ID pin. Parallel or separate, to change the equivalent resistance value corresponding to the set terminal of the charging module, and then adjust the charging current.

In view of the above, a universal serial bus (USB) charging system in accordance with the present invention may have one or more of the following advantages:

(1) The charging system can achieve the charging current adjustment of the dual input charging IC by the single input charging IC.

(2) This charging system can be used with a universal serial bus (USB) to solve the need for other specifications of the charger when using the electronic device.

Please refer to FIG. 1, which is a block diagram of a universal serial bus (USB) charging system of the present invention. The size of the charging current is controlled by the characteristics of the USB ID pin 7 combined with the impedance of the charging module setting terminal 2 and the circuit formed by the switching element 5.

The charging circuit 8 includes a charging module 1, a first impedance 3, a second impedance 4, and a switching element 5. The charging module 1 has a setting end 2 for electrically connecting the first impedance 3 and the second impedance 4. The first impedance 3 can be a resistor, one end of which is connected to the charging module setting end 2, the other end is connected to the ground end, the second impedance 4 can be a resistor, one end of which is connected to the charging module setting end 2, and the first impedance 3 The parallel form is formed, and the other end is connected to the switching element 5. The switching element 5 can be a MOSFET, one end of which is connected to the second impedance 4, the other end is connected to the ground end, and one end is connected to the identification pin of the USB port (ID pin 7. The identification pin (ID pin) 7 is adapted for USB data transmission or power input application, and provides voltage values of different levels to the switching element 5.

When USB is used for data transmission, the identification pin (ID pin) 7 of the USB port is in a floating state. Since the ID pin 7 has a Pull Hight loop inside the system, a switching element 5 must be added. When the interval is separated, the charging module setting end 2 is prevented from colliding with the Pull Hight circuit of the USB identification pin (ID pin) 7, and the high level voltage is output to the switching element 5, and the switching element 5 is driven to be turned off. The impedance element 4 and the switching element 5 circuit form an open circuit, the current of the charging module setting terminal 2 cannot flow through the second impedance element 4 and the switching element 5, and the equivalent resistance value of the charging module setting end 2 and the ground end is the first impedance element. The resistance value of 3, so the equivalent resistance value is greater than the parallel value of the first impedance element 3 and the second impedance element 4, and a smaller current is obtained, achieving a small current charging mode to prevent the computer from providing a large current charging and performing data At the same time of transmission, excessive current is generated, causing the computer to crash.

When the USB is used as the power input, the identification pin (ID pin) 7 of the USB port outputs a low potential, which drives the switching element 5 to be turned on. At this time, the first impedance element 3 and the second impedance element 4 form a parallel state, and the charging module setting end 2 The equivalent resistance value at the ground end is reduced because the impedance is connected in parallel. At this time, the charging current will be determined by the resistance value of the first impedance 3 and the second impedance 4 in parallel, and the smaller the equivalent resistance value, the larger the current will be obtained. Therefore, the charging current can be increased to speed up the charging saturation.

Please refer to FIG. 2, which is a circuit diagram of the implementation of the universal serial bus (USB) charging system of the present invention. In this embodiment, the charging module is implemented with a wafer EMC5754, and the impedance element is implemented with a resistor. Using the signal characteristics on the USB ID pin, the resistance of the set terminal connected to the chip EMC5754

R633, R611, and transistor Q606 to control the magnitude of the charging current.

The charging circuit comprises a chip EMC5754, a first resistor R611, a second resistor R633 and a transistor Q606. The chip EMC5754 has a set terminal PROG to electrically connect the resistor R611 and the resistor R633. One end of the resistor R611 is connected to the charging module setting end PROG, the other end is connected to the ground GND, and one end of the resistor R633 is connected to the charging module setting end. PROG, formed in parallel with R611, connected to transistor Q606, the transistor is a MOSFET, its source terminal is connected to resistor R633, its 汲 terminal is connected to ground GND, and the identification pin of USB 埠 (ID pin) Electrically connected to the gate terminal of the transistor, the identification pin (ID pin) is adapted for USB data transmission or power input application, and provides voltage values of different levels to the transistor control to be turned on or off.

When the USB is doing data transmission, it means that the charging circuit is connected to a computer, and the identification pin (ID pin) of the USB port is in a floating state, since the ID pin has a Pull inside the system. Hight loop, so transistor Q606 must be added to avoid the conflict between the set end PROG of the chip EMC5754 and the Pull Hight loop of the USB ID pin, and output the high level voltage to the gate of the transistor Q606. The transistor Q606 is driven to be turned off. At this time, the circuit of the resistor R633 and the transistor Q606 is opened, and the current at the set end of the chip EMC5754 cannot flow through the resistor R633 and the transistor Q606. Therefore, the equivalent resistance of the set end PROG of the chip EMC5754 and the ground GND is obtained. For the resistance value of R611 (2.5K ohms), the resistor R633 loses this function. The larger the equivalent resistance value of the PROG setting terminal of the chip EMC5754, the smaller the charging current will be, so the charging current can be reduced to achieve small current charging. Mode, to avoid the computer to provide a large current charging and data transmission, while generating an overcurrent and causing the computer to crash.

When the USB is doing power input, it means that the user connects the charger with the USB connector to the charging circuit, the USB pin's identification pin (ID pin) outputs a low potential, the transistor Q606 is turned on, and the transistor Q606 is turned on. The source-to-drain current is generated. At this time, the resistor R611 and the resistor R633 form a parallel state. If the resistance value when the transistor is turned on is ignored, the equivalent resistance of the set terminal PROG of the chip EMC5754 and the ground GND is the resistor R611 and the resistor. R633 parallel value (10K ohms parallel 2.5K ohms is 2K ohms), the charging current will be determined by the parallel resistance value, the smaller the equivalent resistance value of the PROG setting terminal PROG will get the larger charging current, so the charging current Can be increased to speed up the charging saturation.

Through the above charging system, it is possible to use the application identification and charging current adjustment effect achieved by a single input charging chip (for example, wafer EMC5754) which is cheaper than a dual input charging chip.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1. . . Charging module

2. . . Charging module setting end

3. . . First impedance

4. . . Second impedance

5. . . Switching element

6. . . USB埠

7. . . USB埠 recognition pin

as well as

8. . . Charging circuit

1 is a block diagram of a universal serial bus (USB) charging system of the present invention;

Figure 2 is a circuit diagram showing the implementation of the universal serial bus (USB) charging system of the present invention.

1. . . Charging module

2. . . Charging module setting end

3. . . First impedance

4. . . Second impedance

5. . . Switching element

6. . . USB埠

7. . . USB埠 recognition pin

as well as

8. . . Charging circuit

Claims (10)

  1. A universal serial bus (USB) charging system includes: a USB port for receiving a USB connector, the USB connector having an identification pin (ID pin); and a charging module for providing a charging current, The charging module has a setting end; a switching element is electrically coupled to the identification pin; and a plurality of impedance elements, one end of each of the plurality of impedance elements is electrically connected to the set end, and the other end is electrically connected to the a switching element; wherein the switching element adjusts the charging current according to the signal selectivity on the identification pin such that the complex impedance element is connected in parallel or separately to change the impedance value corresponding to the setting end.
  2. The universal serial bus (USB) charging system of claim 1, wherein the identification pin is applied by a data transmission or a power input to provide different voltage levels.
  3. For example, the universal serial bus (USB) charging system described in claim 2, wherein the identification pin provides a high level signal when the data transmission is applied.
  4. The universal serial bus (USB) charging system of claim 3, wherein the switching element provides a high level to be turned off according to the identification pin (ID pin).
  5. The universal serial bus (USB) charging system according to claim 4, wherein when the switching element is turned off, the complex impedance is electrically connected to the other end to form an open circuit and is separated from the set terminal circuit.
  6. For example, the universal serial bus (USB) charging system described in claim 2, wherein the identification pin (ID pin) provides a low level signal when the USB is used for power input.
  7. The universal serial bus (USB) charging system of claim 6, wherein the switching element provides a low level to turn on according to the identification pin (ID pin).
  8. For example, in the universal serial bus (USB) charging system described in claim 7, when the switching element is turned on, the plurality of impedance elements connected to the set end are formed in parallel to reduce the equivalent resistance of the set end to the ground end. value.
  9. A universal serial bus (USB) charging system as described in claim 1, wherein the switching element is a field effect transistor (MOSFET) element.
  10. A universal serial bus (USB) charging system as described in claim 1, wherein the impedance element is a resistor.
TW97143210A 2008-11-07 2008-11-07 Usb charge system TWI386784B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW97143210A TWI386784B (en) 2008-11-07 2008-11-07 Usb charge system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW97143210A TWI386784B (en) 2008-11-07 2008-11-07 Usb charge system

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TW201019086A TW201019086A (en) 2010-05-16
TWI386784B true TWI386784B (en) 2013-02-21

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9201480B2 (en) 2010-12-23 2015-12-01 Standard Microsystems Corporation Method and system for determining an arbitrary charging protocol in USB charging ports
TWI494863B (en) 2011-05-16 2015-08-01 Realtek Semiconductor Corp Dual-interface card reader module
CN102789567B (en) * 2011-05-19 2016-01-20 瑞昱半导体股份有限公司 Double-interface module for card reader
CN103309835A (en) * 2012-03-12 2013-09-18 祥硕科技股份有限公司 Universal serial bus device and power supply method thereof
CN104810868B (en) 2014-01-24 2017-05-10 华硕电脑股份有限公司 Charging system and charging method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6211649B1 (en) * 1999-03-25 2001-04-03 Sourcenext Corporation USB cable and method for charging battery of external apparatus by using USB cable
US6253267B1 (en) * 1997-07-31 2001-06-26 Samsung Electronics Co., Ltd. Hot-plug of PCI bus using single chip
TW200740005A (en) * 2006-02-16 2007-10-16 Summit Microelectronics Inc Switching battery charging systems and methods
TWM333002U (en) * 2007-11-08 2008-05-21 Inventec Besta Co Ltd Charging current determining circuit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6253267B1 (en) * 1997-07-31 2001-06-26 Samsung Electronics Co., Ltd. Hot-plug of PCI bus using single chip
US6211649B1 (en) * 1999-03-25 2001-04-03 Sourcenext Corporation USB cable and method for charging battery of external apparatus by using USB cable
TW200740005A (en) * 2006-02-16 2007-10-16 Summit Microelectronics Inc Switching battery charging systems and methods
TWM333002U (en) * 2007-11-08 2008-05-21 Inventec Besta Co Ltd Charging current determining circuit

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