CN110429688A - A kind of USB twoport charger of the mutual lock control of band - Google Patents
A kind of USB twoport charger of the mutual lock control of band Download PDFInfo
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- CN110429688A CN110429688A CN201910791520.1A CN201910791520A CN110429688A CN 110429688 A CN110429688 A CN 110429688A CN 201910791520 A CN201910791520 A CN 201910791520A CN 110429688 A CN110429688 A CN 110429688A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
Abstract
The invention discloses a kind of USB twoport chargers of the mutual lock control of band, including power conversion module, the first interlock circuit, the second interlock circuit, the first USB current limliting identification module, the 2nd USB current limliting identification module, the first USB interface and secondary USB interface；Power conversion module is used to for 220V alternating current being converted into 5V direct current, and the first interlock circuit and the first USB current limliting identification module are electrically connected；Second interlock circuit and the 2nd USB current limliting identification module are electrically connected；First USB current limliting identification module and the 2nd USB current limliting identification module are electrically connected with power conversion module, and the first USB interface and the first USB current limliting identification module are electrically connected, and secondary USB interface and the 2nd USB current limliting identification module are electrically connected.This charger single port work when, can full power output, meet the requirement of user's quick charge.When twoport works at the same time, the equal half-power output of two interfaces guarantees that the output general power of charger does not exceed rated power, and then trigger overload protection.
Description
Technical field
The present invention relates to charger technologies field, in particular to the USB twoport charger of a kind of mutual lock control of band.
Background technique
Portable mobile apparatus is more and more, such as mobile phone or tablet computer.With development in science and technology and people's life matter
The raising of amount, people propose higher demand to the charging of portable mobile apparatus, and the charger of traditional single port USB output is
It can not meet this demand.Many producers are all proposed the USB charging equipment of twoport, more mouthfuls now, but most of twoports/more
Mouth USB charging equipment is difficult to solve the problems, such as simultaneously:
(1) when user only uses an interface, remaining interface is idle, and there is no full power outputs for USB charging equipment, such as
This one, then be easy to cause the output power redundancy of USB charging equipment excessive, but can not meet the fast charger of user
It asks.
(2) when user uses multiple interfaces, all interfaces are at full power output state, in this way, then hold
Easily make the output general power of USB charging equipment beyond rated power, triggers overload protection, when serious, can also USB be made to charge
Device temperature is excessively high, causes fire.
Summary of the invention
It is an object of the present invention to solving above-mentioned the deficiencies in the prior art, the USB for providing a kind of mutual lock control of band is bis-
Mouth charger.
To reach this purpose, The technical solution adopted by the invention is as follows:
A kind of USB twoport charger of the mutual lock control of band, including power conversion module, the first interlock circuit, the second interlocking
Circuit, the first USB current limliting identification module, the 2nd USB current limliting identification module, the first USB interface and secondary USB interface；
Power conversion module is used to 220V alternating current being converted into 5V direct current, the first interlock circuit and the first USB current limliting
Identification module is electrically connected；Second interlock circuit and the 2nd USB current limliting identification module are electrically connected；First USB current limliting identifies mould
Block and the 2nd USB current limliting identification module are electrically connected with power conversion module, and the first USB interface and the first USB current limliting are known
Other module is electrically connected, and secondary USB interface and the 2nd USB current limliting identification module are electrically connected.
Further, the first interlock circuit includes resistance R1, resistance R2, resistance R3, metal-oxide-semiconductor Q1 and control signal
One end of STAT2, resistance R1 and 5V DC power supply are electrically connected, and the other end and control signal STAT2 of resistance R1 is electrically connected；
The grid for controlling signal STAT2 and metal-oxide-semiconductor Q1 is electrically connected, and the drain electrode of metal-oxide-semiconductor Q1 and one end of resistance R3 are electrically connected, MOS
The source electrode of pipe Q1 and the other end of resistance R3 are electrically connected, the source electrode ground connection of metal-oxide-semiconductor Q1；One end of resistance R2 is with metal-oxide-semiconductor Q1's
Drain electrode is electrically connected, and the current limit threshold input pin of the other end of resistance R2 and the first USB current limliting identification module is electrically connected.
Further, the second interlock circuit includes resistance R4, resistance R5, resistance R6, metal-oxide-semiconductor Q2 and control signal
One end of STAT1, resistance R4 and 5V DC power supply are electrically connected, and the other end and control signal STAT1 of resistance R4 is electrically connected,
The grid for controlling signal STAT1 and metal-oxide-semiconductor Q2 is electrically connected, and the drain electrode of metal-oxide-semiconductor Q2 and one end of resistance R6 are electrically connected, MOS
The source electrode of pipe Q2 and the other end of resistance R6 are electrically connected, and the source electrode ground connection of metal-oxide-semiconductor Q2, one end of resistance R5 is with metal-oxide-semiconductor Q2's
Drain electrode is electrically connected, and the current limit threshold input pin of the other end of resistance R5 and the 2nd USB current limliting identification module is electrically connected.
Further, when the first USB interface is idle, control signal STAT1 is high level, when the first USB interface works
When, control signal STAT1 is low level.
Further, when secondary USB interface leaves unused, control signal STAT2 is high level, when secondary USB interface works
When, control signal STAT2 is low level.
It further, further include the first overheat protector module, the first overheat protector module and the first USB current limliting identification module
Enabled input pin be electrically connected.
Further, the first overheat protector module includes thermistor RT1 and resistance RT2, one end of thermistor RT1
It is electrically connected with 5V power supply, the other end of thermistor RT1 and one end of resistance RT2 are electrically connected, and thermistor RT1's is another
End and the enabled input pin of the first USB current limliting identification module are electrically connected, the other end ground connection of resistance RT2.
It further, further include the second overheat protector module, the second overheat protector module identifies mould with the 2nd USB current limliting
The enabled input pin of block is electrically connected.
Further, the second overheat protector module includes thermistor RT3 and resistance RT4, one end of thermistor RT3
It is electrically connected with 5V power supply, the other end of thermistor RT3 and one end of resistance RT4 are electrically connected, and thermistor RT4's is another
End and the enabled input pin of the 2nd USB current limliting identification module 5 are electrically connected.
The invention has the benefit that the present invention proposes a kind of USB twoport charger of mutual lock control of band, pass through setting the
One interlock circuit and the second interlock circuit adjust the output power of the first USB interface and secondary USB interface, guarantee in single port work
When work, USB charging equipment can full power output, meet the requirement of user's quick charge.When twoport works at the same time
It waits, the first USB interface and the equal half-power output of secondary USB interface guarantee that the output general power of USB charging equipment does not exceed volume
Determine power, and then triggers overload protection.The circuit structure of this bis- button chargers of USB is simple, and using general device, price is just
Preferably, all kinds of charger occasions be can be widely applied to.
Detailed description of the invention
Fig. 1 is the structural block diagram of the USB twoport charger with mutual lock control of one embodiment of the invention；
Fig. 2 is the circuit diagram of the USB twoport charger of the mutual lock control of band shown in FIG. 1.
Wherein, power conversion module 1, the first interlock circuit 2, the second interlock circuit 3, the first USB current limliting identification module 4,
2nd USB current limliting identification module 5, the first USB interface 6, secondary USB interface 7, the first overheat protector module 8, the second overheat protector
Module 9.
Specific embodiment
Illustrate with reference to the accompanying drawing and passes through specific embodiment to further illustrate the technical scheme of the present invention.
As shown in Figure 1 and Figure 2, the USB twoport charger of the mutual lock control of a kind of band, including power conversion module 1, first are mutual
Lock circuit 2, the second interlock circuit 3, the first USB current limliting identification module 4, the 2nd USB current limliting identification module 5, the first USB interface 6
With secondary USB interface 7；
Power conversion module 1 is used to for 220V alternating current being converted into 5V direct current, and the first interlock circuit 2 and the first USB are limited
Identification module 4 is flowed to be electrically connected；Second interlock circuit 3 and the 2nd USB current limliting identification module 5 are electrically connected；First USB current limliting is known
Other module 4 and the 2nd USB current limliting identification module 5 are electrically connected with power conversion module 1, the first USB interface 6 and first
USB current limliting identification module 4 is electrically connected, and secondary USB interface 7 and the 2nd USB current limliting identification module 5 are electrically connected.
The present invention proposes a kind of USB twoport charger of mutual lock control of band, including the interlocking electricity of power conversion module 1, first
Road 2, the second interlock circuit 3, the first USB current limliting identification module 4, the 2nd USB current limliting identification module 5, the first USB interface 6 and
Two USB interfaces 7.Wherein the first interlock circuit 2 and the first USB current limliting identification module 4 are electrically connected；Second interlock circuit 3 and
Two USB current limliting identification modules 5 are electrically connected, and are distinguished by the first USB current limliting identification module 4 and the 2nd USB current limliting identification module 5
It identifies the working condition of the first USB interface 6 and secondary USB interface 7, and is sent to the first interlock circuit 2 and the second interlock circuit
3, the first interlock circuit 2 and the second interlock circuit 3 are converted to high level or low level, so as to adjust the first USB interface 6 and second
The output power of USB interface 7, guarantee single port work when, USB charger can full power output, it is quick to meet user
The requirement of charging.When twoport works at the same time, the first USB interface 6 and the output of the equal half-power of secondary USB interface 7 guarantee
The output general power of USB charger does not exceed rated power, and then triggers overload protection.
The circuit structure of this bis- button chargers of USB is simple, cheap using general device, can be widely applied
In all kinds of charger occasions.
Further, the first interlock circuit 2 includes resistance R1, resistance R2, resistance R3, metal-oxide-semiconductor Q1 and control signal
One end of STAT2, resistance R1 and 5V DC power supply are electrically connected, and the other end and control signal STAT2 of resistance R1 is electrically connected；
The grid for controlling signal STAT2 and metal-oxide-semiconductor Q1 is electrically connected, and the drain electrode of metal-oxide-semiconductor Q1 and one end of resistance R3 are electrically connected, MOS
The source electrode of pipe Q1 and the other end of resistance R3 are electrically connected, the source electrode ground connection of metal-oxide-semiconductor Q1；One end of resistance R2 is with metal-oxide-semiconductor Q1's
Drain electrode is electrically connected, and the current limit threshold input pin of the other end of resistance R2 and the first USB current limliting identification module 4 is electrically connected.
Further, the second interlock circuit 3 includes resistance R4, resistance R5, resistance R6, metal-oxide-semiconductor Q2 and control signal
One end of STAT1, resistance R4 and 5V DC power supply are electrically connected, and the other end and control signal STAT1 of resistance R4 is electrically connected,
The grid for controlling signal STAT1 and metal-oxide-semiconductor Q2 is electrically connected, and the drain electrode of metal-oxide-semiconductor Q2 and one end of resistance R6 are electrically connected, MOS
The source electrode of pipe Q2 and the other end of resistance R6 are electrically connected, and the source electrode ground connection of metal-oxide-semiconductor Q2, one end of resistance R5 is with metal-oxide-semiconductor Q2's
Drain electrode is electrically connected, and the current limit threshold input pin of the other end of resistance R5 and the 2nd USB current limliting identification module 5 is electrically connected.
In the case where the first USB interface 6 does not access any load, control signal STAT1 will export high level.At this point,
The state that metal-oxide-semiconductor Q2 will be on, resistance R6, which is equivalent to, to be short-circuited, since one end of resistance R5 and the 2nd USB current limliting identify
The current limit threshold input pin of module 5 is electrically connected, and the output power of the 2nd USB current limliting identification module 5 will be by the resistance of resistance R5
Value determines.By the way that the resistance value of R5 is arranged, the output power of secondary USB interface 7 can be arranged to full power output, such as 5V
2A can give mobile electronic device quick charge by secondary USB interface 7 with guarantee.After the access load of the first USB interface 6,
Control signal STAT1 will export low level.At this point, metal-oxide-semiconductor Q2 will be in off state, resistance R5 and resistance R6 form series connection
The output power of relationship, the 2nd USB current limliting identification module 5 will be determined by total resistance value of resistance R5 and resistance R6.Pass through setting electricity
The output power of first USB interface 6, can be arranged to the half of full power, such as 5V by the resistance value for hindering R5 and resistance R6
1A, to guarantee when secondary USB interface 7 is equally in working condition, the first USB interface 6 and secondary USB interface 7 it is total defeated
Power does not exceed rated value out.
Similarly, in the case where secondary USB interface 7 does not access any load, control signal STAT2 will export high level.
At this point, metal-oxide-semiconductor Q1 will be in the state of conducting, resistance R3, which is equivalent to, to be short-circuited, one end and the first USB current limliting due to resistance R2
The current limit threshold input pin of identification module 4 is electrically connected, and the output power of the first USB current limliting identification module 4 will be by resistance R2
Resistance value determine.By the resistance value of setting R2, the output power of the first USB interface 6 can be arranged to full power output, such as
5V 2A can give mobile electronic device quick charge by the first USB interface 6 with guarantee.It accesses and loads in secondary USB interface 7
Afterwards, control signal STAT2 will export low level.At this point, metal-oxide-semiconductor Q1 will be in off state, resistance R2 and resistance R3 are formed
The output power of series relationship, the first USB current limliting identification module 4 will be determined by total resistance value of resistance R2 and resistance R3.By setting
The resistance value of resistance R2 and resistance R3 are set, the output power of secondary USB interface 7 can be arranged to the half of full power, such as
5V 1A, to guarantee when the first USB interface 6 is equally in working condition, the first USB interface 6 and secondary USB interface 7 it is total
Output power does not exceed rated value.
For example, the first current limliting identification module and the second current limliting identification module are selected as USB current limliting chip PL2700, resistance
R2, resistance R3, resistance R5 and resistance R6 resistance value be set to 3.4K Ω, when user only uses the first USB interface 6 or
When two USB interfaces 7 charge to mobile electronic device, the output power of the first USB interface 6 or secondary USB interface 7 is 5V 2A,
The general power of output is 10W.When user is filled using the first USB interface 6 and secondary USB interface 7 to mobile electronic device simultaneously
When electric, the output power of the first USB interface 6 and secondary USB interface 7 is 5V 1A, and the general power of output is equally 10W.
Charger of the invention is not limited to twoport output, can be extended to 3 or more USB interfaces.According to
Equal number of USB current limliting chips and control signal are arranged in the quantity of USB interface, then defeated in the current limit threshold of USB current limliting chip
Enter the resistance values series resistances such as the quantity such as pin access, mutual lock control carried out to USB current limliting chip using control signal, it is ensured that
Full power exports when USB charging equipment single port works, and when two mouthfuls of work, the output of each USB interface half-power, more mouthfuls work
When, the output power of each USB interface successively decreases, and to meet the requirement of user's quick charge, while guaranteeing the defeated of USB charging equipment
General power is without departing from rated power out.
Further, when the first USB interface 6 leaves unused, control signal STAT1 is high level, when 6 work of the first USB interface
When making, control signal STAT1 is low level.
When the first USB interface 6 leaves unused, i.e., in the case that the first USB interface 6 does not access any load, control signal
STAT1 is high level, and secondary USB interface 7 is quickly charged to mobile electronic device；When the work of the first USB interface 6,
Control signal STAT1 is low level, so that the output general power of the first USB interface 6 and secondary USB interface 7 is less than or equal to volume
Determine general power, it is ensured that charger uses safe.The high level or low level for controlling signal STAT1 both can be by the first USB current limlitings
Identification module 4 itself generates, and can also be obtained by external electric current, voltage detecting circuit conversion；External electric current, voltage inspection
Slowdown monitoring circuit, which is in idle state or working condition by the first USB interface 6 of detection, to be made to control signal STAT1 output high level
Or low level.
Further, when secondary USB interface 7 leaves unused, control signal STAT2 is high level, when 7 work of secondary USB interface
When making, control signal STAT2 is low level.
When secondary USB interface 7 leaves unused, i.e., in the case that secondary USB interface 7 does not access any load, control signal
STAT2 is high level, and the first USB interface 6 is quickly charged to mobile electronic device；When secondary USB interface 7 works,
Control signal STAT2 is low level, so that the output general power of the first USB interface 6 and secondary USB interface 7 is less than or equal to volume
Determine general power, it is ensured that charger uses safe.The high level or low level for controlling signal STAT2 both can be by the 2nd USB current limlitings
Identification module 5 itself generates, and can also be obtained by external electric current, voltage detecting circuit conversion.External electric current, voltage inspection
Slowdown monitoring circuit, which is in idle state or working condition by detection secondary USB interface 7, to be made to control signal STAT2 output high level
Or low level.
It further, further include the first overheat protector module 8, the first overheat protector module 8 and the first USB current limliting identify mould
The enabled input pin of block 4 is electrically connected.
Provided with the first overheat protector module 8, for protecting the first USB interface 6.First overheat protector module 8 and first
The enabled input pin of USB current limliting identification module 4 is electrically connected, different in 6 output short-circuit of the first USB interface or poor contact etc.
Under normal state, the first overheat protector module 8 controls the first USB current limliting identification module 4 and stops working, thus to the first USB interface 6
It plays a protective role.
Further, the first overheat protector module 8 include thermistor RT1 and resistance RT2, the one of thermistor RT1
End is electrically connected with 5V power supply, and the other end of thermistor RT1 and one end of resistance RT2 are electrically connected, and thermistor RT1's is another
The enabled input pin of one end and the first USB current limliting identification module 4 is electrically connected, the other end ground connection of resistance RT2.
First USB current limliting identification module 4 is existing universal circuit, and the first USB current limliting identification module 4 uses USB current limliting
Chip, such as PL2700 etc..Thermistor RT1 is the thermistor of positive temperature coefficient, and resistance value increases as temperature increases
Add.The other end of thermistor RT1 is connect with the enabled input pin of the first USB current limliting identification module 4, for controlling first
The working condition of USB current limliting identification module 4.Under the abnormalities such as 6 output short-circuit of the first USB interface or poor contact, heat
The resistance value of quick resistance RT1 because temperature increase due to increase, resistance value increase to a certain extent when, will control the first USB current limliting identify
Module 4 stops working.The rationally resistance value of setting resistance RT2 can provide overheat protector for the first USB interface 6.
It further, further include the second overheat protector module 9, the second overheat protector module 9 is identified with the 2nd USB current limliting
The enabled input pin of module 5 is electrically connected.
Provided with the second overheat protector module 9, for protecting secondary USB interface 7.Second overheat protector module 9 and second
The enabled input pin of USB current limliting identification module 5 is electrically connected, different in 7 output short-circuit of secondary USB interface or poor contact etc.
Under normal state, the second overheat protector module 9 controls the 2nd USB current limliting identification module 5 and stops working, thus to secondary USB interface 7
It plays a protective role.
Further, the second overheat protector module 9 include thermistor RT3 and resistance RT4, the one of thermistor RT3
End is electrically connected with 5V power supply, and the other end of thermistor RT3 and one end of resistance RT4 are electrically connected, and thermistor RT4's is another
The enabled input pin of one end and the 2nd USB current limliting identification module 5 is electrically connected.
2nd USB current limliting identification module 5 is existing universal circuit, and the 2nd USB current limliting identification module 5 uses USB current limliting
Chip, such as PL2700 etc..Thermistor RT3 is the thermistor of positive temperature coefficient, and resistance value increases as temperature increases
Add.The other end of thermistor RT3 is connect with the enabled input pin of the 2nd USB current limliting identification module 5, for controlling second
The working condition of USB current limliting identification module 5.Under the abnormalities such as 7 output short-circuit of secondary USB interface or poor contact, heat
The resistance value of quick resistance RT3 because temperature increase due to increase, resistance value increase to a certain extent when, will control the 2nd USB current limliting identify
Module 5 stops working.The rationally resistance value of setting resistance RT4 can provide overheat protector for secondary USB interface 7.
The technical principle of the invention is described above in combination with a specific embodiment.These descriptions are intended merely to explain of the invention
Principle, and shall not be construed in any way as a limitation of the scope of protection of the invention.Based on the explanation herein, the technology of this field
Personnel can associate with other specific embodiments of the invention without creative labor, these modes are fallen within
Within protection scope of the present invention.
Claims (9)
1. a kind of USB twoport charger of the mutual lock control of band, which is characterized in that including power conversion module, the first interlock circuit,
Second interlock circuit, the first USB current limliting identification module, the 2nd USB current limliting identification module, the first USB interface and the 2nd USB connect
Mouthful；
The power conversion module is used to 220V alternating current being converted into 5V direct current, first interlock circuit and the first USB
Current limliting identification module is electrically connected；Second interlock circuit and the 2nd USB current limliting identification module are electrically connected；Described first
USB current limliting identification module and the 2nd USB current limliting identification module are electrically connected with the power conversion module, and described the
One USB interface and the first USB current limliting identification module are electrically connected, and the secondary USB interface and the 2nd USB current limliting are known
Other module is electrically connected.
2. a kind of USB twoport charger of the mutual lock control of band according to claim 1, which is characterized in that described first mutually
Lock circuit includes resistance R1, resistance R2, resistance R3, metal-oxide-semiconductor Q1 and control signal STAT2, one end of the resistance R1 and 5V
DC power supply is electrically connected, and the other end of the resistance R1 and the control signal STAT2 are electrically connected；The control signal
The grid of the STAT2 and metal-oxide-semiconductor Q1 is electrically connected, and the drain electrode of the metal-oxide-semiconductor Q1 is electrically connected with one end of the resistance R3,
The other end of the source electrode of the metal-oxide-semiconductor Q1 and the resistance R3 are electrically connected, the source electrode ground connection of the metal-oxide-semiconductor Q1；The resistance
The drain electrode of one end of R2 and the metal-oxide-semiconductor Q1 are electrically connected, and the other end of the resistance R2 and the first USB current limliting identify mould
The current limit threshold input pin of block is electrically connected.
3. a kind of USB twoport charger of the mutual lock control of band according to claim 1, which is characterized in that described second mutually
Lock circuit includes resistance R4, resistance R5, resistance R6, metal-oxide-semiconductor Q2 and control signal STAT1, one end of the resistance R4 and 5V
DC power supply is electrically connected, and the other end of the resistance R4 and the control signal STAT1 are electrically connected, the control signal
The grid of the STAT1 and metal-oxide-semiconductor Q2 is electrically connected, and the drain electrode of the metal-oxide-semiconductor Q2 is electrically connected with one end of the resistance R6,
The other end of the source electrode of the metal-oxide-semiconductor Q2 and the resistance R6 are electrically connected, the source electrode ground connection of the metal-oxide-semiconductor Q2, the resistance
The drain electrode of one end of R5 and the metal-oxide-semiconductor Q2 are electrically connected, and the other end of the resistance R5 and the 2nd USB current limliting identify mould
The current limit threshold input pin of block is electrically connected.
4. a kind of USB twoport charger of the mutual lock control of band according to claim 3, which is characterized in that when described first
When USB interface leaves unused, the control signal STAT1 is high level, when first USB interface work, the control signal
STAT1 is low level.
5. a kind of USB twoport charger of the mutual lock control of band according to claim 2, which is characterized in that when described second
When USB interface leaves unused, the control signal STAT2 is high level, when secondary USB interface work, the control signal
STAT2 is low level.
6. a kind of USB twoport charger of the mutual lock control of band according to claim 1, which is characterized in that further include first
The enabled input pin of overheat protector module, the first overheat protector module and the first USB current limliting identification module is electrical
Connection.
7. a kind of USB twoport charger of the mutual lock control of band according to claim 6, which is characterized in that first mistake
Warm protective module includes that one end of thermistor RT1 and resistance RT2, the thermistor RT1 and 5V power supply are electrically connected, institute
One end of the other end and the resistance RT2 of stating thermistor RT1 is electrically connected, the other end of the thermistor RT1 and institute
The enabled input pin for stating the first USB current limliting identification module is electrically connected, the other end ground connection of the resistance RT2.
8. a kind of USB twoport charger of the mutual lock control of band according to claim 1, which is characterized in that further include second
Overheat protector module, the second overheat protector module and the enabled input pin with the 2nd USB current limliting identification module are electric
Property connection.
9. a kind of USB twoport charger of the mutual lock control of band according to claim 8, which is characterized in that second mistake
Warm protective module includes that one end of thermistor RT3 and resistance RT4, the thermistor RT3 and 5V power supply are electrically connected, institute
One end of the other end and the resistance RT4 of stating thermistor RT3 is electrically connected, the other end of the thermistor RT4 and institute
The enabled input pin for stating the 2nd USB current limliting identification module is electrically connected.
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| CN201910791520.1A CN110429688A (en) | 2019-08-26 | 2019-08-26 | A kind of USB twoport charger of the mutual lock control of band |
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