CN113131573A - Multi-output-port fast charging switching circuit and method - Google Patents

Multi-output-port fast charging switching circuit and method Download PDF

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Publication number
CN113131573A
CN113131573A CN202110408048.6A CN202110408048A CN113131573A CN 113131573 A CN113131573 A CN 113131573A CN 202110408048 A CN202110408048 A CN 202110408048A CN 113131573 A CN113131573 A CN 113131573A
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circuit
signal
output
control
power
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CN202110408048.6A
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CN113131573B (en
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刘华清
刘陵刚
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Shenzhen Zhuoruisichuang Technology Co ltd
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Shenzhen Zhuoruisichuang Technology Co ltd
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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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • 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
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters

Abstract

The invention discloses a multi-output-port quick-charging switching circuit and a method, wherein the multi-output-port quick-charging switching circuit comprises a power supply circuit, a control circuit and a plurality of USB output ports (1-n), the power supply circuit is electrically connected with each USB output port and provides quick-charging voltage or common-charging voltage, the USB output ports (1-n) are electrically connected with a detection circuit, the detection circuit is used for detecting the output line of each USB output port and forming an electrifying feedback signal, the detection circuit is electrically connected with the control circuit, the control circuit is also electrically connected with the power supply circuit, the detection circuit is used for acquiring the counting of electrifying lines by the electrifying feedback signal and sending the counting of the electrifying lines to the control circuit, the control circuit calculates the number of distinguishing signals according to the counting of the electrifying lines, to determine whether a command signal is issued to the power circuit that allows the provision of a fast charging voltage.

Description

Multi-output-port fast charging switching circuit and method
Technical Field
The invention relates to the field of fast charging switching technology, in particular to a fast charging switching circuit with multiple output ports and a fast charging switching method.
Background
In the prior art that is relatively close to the prior art, as shown in fig. 1, a multi-output-port fast charging switching circuit includes a power circuit 10, a fast charging control unit 11, at least two interface control circuits, at least two switch control circuits, and at least two output interfaces, a first switch control circuit 40 is connected between an output terminal of the power circuit 10 and a first output interface USB1, a second switch control circuit 50 is connected between an output terminal of the power circuit 10 and a second output interface USB2, the fast charging control unit 11 is electrically connected to the at least two interface control circuits, the first interface control circuit 20 is electrically connected to the first switch control circuit 40 and the first output interface USB1, and the second interface control circuit 30 is electrically connected to the second switch control circuit 50 and the second output interface USB 2.
The power circuit 10 may be an adapter or a vehicle charging source, the two USB ports and their corresponding control circuits are equivalent, fig. 1 includes two USB output interfaces and their corresponding control circuits, the USB output interfaces are not limited to two, but may be three, four or more, and each USB output interface is added with its corresponding control circuit. Two output interfaces are the USB Type-A interface. The interface control circuit comprises a current detection circuit and a first plug detection circuit, wherein the grounding end of a first output interface USB1 is connected with a first resistor R1, the grounding end of a second output interface USB2 is connected with a second resistor R2, the current detection circuit 21 of the first interface control circuit 20 detects a differential voltage signal of the first resistor R1, the current detection circuit 31 of the second interface control circuit 30 detects a differential voltage signal of a second resistor R2, the first plug detection circuit 22 of the first interface control circuit 20 detects a signal of a data signal end of a first output interface USB1, and the first plug detection circuit 32 of the second interface control circuit 30 detects a signal of a data signal end of a second output interface USB 2. The switch control circuit comprises a switch circuit and a second plug detection circuit, the switch circuit 41 of the first switch control circuit 40 is used for switching on/off the charging path from the power circuit 10 to the first output interface USB1, the switch circuit 51 of the second switch control circuit 50 is used for switching on/off the charging path from the power circuit 10 to the second output interface USB2, the second plug detection circuit 42 of the first switch control circuit 40 detects the signal of the voltage output end of the first output interface USB1, and the second plug detection circuit 52 of the second switch control circuit 50 detects the signal of the voltage output end of the second output interface USB 2. In the prior art, a switch control circuit is arranged between each output interface and a power output end of the quick charge switching circuit, and the switch control circuit controls the on and off of a power path of each output interface, wherein the on and off of the switch circuit are controlled by a quick charge control unit 11 and a plug detection circuit together; the first plug detection circuit and the second plug detection circuit are operated in parallel, the first plug detection circuit samples VOUT signals of the output interface to perform plug detection, the second plug detection circuit samples DP and DM signals of the output interface to perform plug detection, any one plug detection circuit judges that equipment is plugged in or unplugged when the equipment is plugged in or unplugged, and the double USB plug detection circuit performs detection in real time; the current detection circuit is realized by detecting the voltage difference of the resistor on the GND path of the output interface. Although the fast-charging switching circuit in the prior art or the fast-charging switching circuit in the similar technology can realize the fast-charging switching function of multiple output ports, in practice, there are many disadvantages, such as very complicated circuit configuration, redundant control signals/lines, and not brief control of signal timing, which results in that the control signal/line design needs to be reconsidered when multiple output ports are expanded, and the fast-charging control unit needs to be configured even when there are more output ports, and the control time of the fast-charging switching circuit in the prior art is relatively long, and the effect is relatively general.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a multi-output-port quick-charging switching circuit and a method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a quick switching circuit that fills of multi-output port, its characterized in that, includes power supply circuit, control circuit and a plurality of USB delivery port (1-n), power supply circuit and the equal electric connection of each USB delivery port and provide quick charge voltage or ordinary charging voltage, the equal electricity of a plurality of USB delivery port (1-n) connect detection circuit, detection circuit be used for detecting the output line of each USB delivery port and form circular telegram feedback signal, detection circuit and control circuit electric connection, control circuit still with power supply circuit electric connection, detection circuit be used for obtaining circular telegram circuit count and send circular telegram circuit count for control circuit with circular telegram feedback signal, control circuit according to circular telegram circuit countCounting the number of the discrimination signal to determine whether a command signal allowing the supply of the rapid charging voltage is issued to the power supply circuit; the control circuit calculates the value of the discrimination signal according to the counting of the electrified circuit so as to determine whether to send a command signal which allows the power circuit to provide the quick charging voltage, and specifically comprises the following steps: the value of the discrimination signal is initially 0 or 0b0 decimal, when the number of the electrified circuit is increased, the number of the electrified circuit is increased to 1, the value of the discrimination signal is still 0b0, when the number of the electrified circuit is increased to 2, the value of the discrimination signal is continuously increased to 0b1, when the number of the electrified circuit is increased to 3, the value of the discrimination signal is continuously increased to 0b11, namely when the number of the electrified circuit is n decimal, the value of the discrimination signal is 2 decimaln-1-1, and the discrimination signal value is represented by binary; outputting a command signal that does not allow the provision of the fast charging voltage as long as the last bit of the binary representation of the discrimination signal value is 1, and outputting a command signal that allows the provision of the fast charging voltage as long as the last bit of the binary representation of the discrimination signal value is 0; when the pass line count is decremented, the last bit of the binary representation of the decision signal value is maintained as 1 as long as there is a pass line count that is not 1, and the other bits can overflow until the last bit of the binary representation of the decision signal value is set to 0 as long as the pass line count is decremented to 1 or 0.
The charging circuit is characterized in that each of the plurality of USB output ports (1-n) comprises an output line Vout, and the output line Vout is used for outputting charging current and sending an electrifying feedback signal to the detection circuit.
The power supply circuit comprises a multi-interface output circuit, a voltage reduction circuit, a quick charging voltage control circuit, an AC-DC conversion circuit and a transformation circuit, wherein the transformation circuit is electrically connected with a mains supply circuit, the transformation circuit is also electrically connected with the voltage reduction circuit through the AC-DC conversion circuit, the control end of the voltage reduction circuit is electrically connected with the quick charging voltage control circuit, the output end of the voltage reduction circuit is electrically connected with the multi-interface output circuit, the output end of the multi-interface output circuit is electrically connected with the output line Vout of each USB output port, and the output end of the multi-interface output circuit outputs charging current to the output line Vout of each USB output port.
The detection circuit comprises a counting circuit and a feedback electrifying signal circuit, wherein the counting circuit is electrically connected with the feedback electrifying signal circuit, the feedback electrifying signal circuit is provided with a plurality of input ends p1-pn, the input end of the feedback electrifying signal circuit is electrically connected with an output line Vout of each USB output port, the input end of one feedback electrifying signal circuit is electrically connected with the output line Vout corresponding to one USB output port, the output line Vout is specifically used for sending electrifying feedback signals to the input end of the feedback electrifying signal circuit, and the counting circuit is used for obtaining the counting of the electrifying lines by the electrifying feedback signals and sending the counting of the electrifying lines to the control circuit.
Furthermore, the control circuit comprises a control ic, the control ic at least configures a counting feedback end and a control end, the control ic is electrically connected with the counting circuit of the detection circuit through the counting feedback end and obtains the counting of the power-on circuit, the control ic is electrically connected with the input end of the quick charge voltage control circuit through the control end, the control end which only judges that the last bit of binary representation of the signal value is 1 control ic outputs a command signal which does not allow the quick charge voltage to be provided to the input end of the quick charge voltage control circuit in the power supply circuit, the control end which only judges that the last bit of binary representation of the signal value is 0 control ic outputs a command signal which allows the quick charge voltage to be provided to the input end of the quick charge voltage control circuit in the power supply circuit, and the quick charge voltage control circuit adjusts the voltage reduction circuit according to the command signal.
Furthermore, the USB output ports (1-n) comprise USB output ports of a USB Standard-A type.
Further, the fast charging voltage comprises 5.5 volts, and the common voltage comprises 5 volts.
The quick charge switching method of the multi-output-port quick charge switching circuit is characterized by comprising the following steps of:
the detection circuit detects the output line of each USB output port and forms an electrifying feedback signal, and the electrifying feedback signal is used for acquiring the electrifying circuit count and sending the electrifying circuit count to the control circuit;
the control circuit calculates the value of the discrimination signal according to the counting of the electrified circuit so as to determine whether a command signal allowing the power supply circuit to provide the quick charging voltage is sent or not;
wherein, the control circuit counts the process of calculating the distinguishing signal value according to the electrified circuit:
the initial value of the signal is 0 or 0b0 decimal, when the USB output port is increased, the counting of the electrified circuit is increased, and when the counting of the electrified circuit is n decimal, the value of the signal is 2 decimaln-1-1, and the discrimination signal value is represented by binary;
the control circuit judges: outputting a command signal not allowing the supply of the fast charging voltage to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 1, and outputting a command signal allowing the supply of the fast charging voltage to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 0;
when the USB output port is reduced, the number of the electrified lines is reduced, as long as the number of the electrified lines is not 1, the last bit of the binary representation of the distinguishing signal value is maintained to be 1, and other bits can overflow until the number of the electrified lines is reduced to 1 or 0, the last bit of the binary representation of the distinguishing signal value is set to be 0;
and during the reduction of the USB output port, the control circuit judges that: a command signal not allowing the supply of the fast charging voltage is output to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 1, and a command signal allowing the supply of the fast charging voltage is output to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 0.
The invention has the advantages that the multi-output-port fast charging switching circuit has simpler circuit configuration and control signals/circuits and better logic, the control of the signal sequence is simple and very convenient to expand the output ports, the output ports are more and no fast charging control unit needs to be replaced under the condition that the output ports need to be expanded, the control time of the fast charging circuit is short, and the sensitivity is very high, the circuit or the method outputs a command signal which does not allow the fast charging voltage as long as the last bit of the binary representation of the judgment signal value is 1 in the specific control circuit control, outputs a command signal which allows the fast charging voltage as long as the last bit of the binary representation of the judgment signal value is 0, and only the last bit of the binary representation of the judgment signal value needs to occupy resources for maintenance for the control circuit or the control chip in practice, other bits can overflow, the whole control process can be completed under the condition of very little resource consumption, and the method is efficient and simple.
The description of the figures in the drawings,
FIG. 1 is a circuit connection block diagram of a multi-output-port fast charging switching circuit in the prior art
Fig. 2 is a circuit connection block diagram of a multi-output-port fast charging switching circuit according to an embodiment of the present application
Fig. 3 is a block diagram of a circuit connection of a multi-output-port fast charging switching circuit according to an embodiment of the present application.
The invention is further illustrated with reference to the following figures and examples.
Detailed Description
In a specific implementation, an embodiment of the multi-output-port fast charging switching circuit of the present application is shown in fig. 2, and includes a power circuit, a control circuit, and a plurality of USB output ports (1-n), where the power circuit is electrically connected to each USB output port and provides a fast charging voltage or a normal charging voltage, the plurality of USB output ports (1-n) are electrically connected to a detection circuit, the detection circuit is configured to detect an output line of each USB output port and form an energization feedback signal, the detection circuit is electrically connected to the control circuit, the control circuit is further electrically connected to the power circuit, the detection circuit is configured to obtain an energization line count according to the energization feedback signal and send the energization line count to the control circuit, and the control circuit calculates a determination signal value according to the energization line count, to determine whether to issue a grant to the power circuitA command signal providing a fast charge voltage; in an implementation, the detection circuit detects an output line of each USB output port and forms an electrifying feedback signal, acquires an electrifying line count according to the electrifying feedback signal and sends the electrifying line count to the control circuit; the control circuit calculates the value of the discrimination signal according to the counting of the electrified circuit so as to determine whether a command signal allowing the power supply circuit to provide the quick charging voltage is sent or not; the control circuit calculates the value of the discrimination signal according to the counting of the electrified circuit so as to determine whether to send a command signal which allows the power circuit to provide the quick charging voltage, and specifically comprises the following steps: the value of the discrimination signal is initially 0 or 0b0 decimal, when the number of the electrified circuit is increased, the number of the electrified circuit is increased to 1, the value of the discrimination signal is still 0b0, when the number of the electrified circuit is increased to 2, the value of the discrimination signal is continuously increased to 0b1, when the number of the electrified circuit is increased to 3, the value of the discrimination signal is continuously increased to 0b11, namely when the number of the electrified circuit is n decimal, the value of the discrimination signal is 2 decimaln-1-1, and the discrimination signal value is represented by binary; outputting a command signal that does not allow the provision of the fast charging voltage as long as the last bit of the binary representation of the discrimination signal value is 1, and outputting a command signal that allows the provision of the fast charging voltage as long as the last bit of the binary representation of the discrimination signal value is 0; when the pass line count is decremented, the last bit of the binary representation of the decision signal value is maintained as 1 as long as there is a pass line count that is not 1, and the other bits can overflow until the last bit of the binary representation of the decision signal value is set to 0 as long as the pass line count is decremented to 1 or 0.
Therefore, the application only needs to judge in the implementation: the command signal which does not allow the rapid charging voltage to be provided is output as long as the last bit of the binary representation of the discrimination signal value is 1, the command signal which allows the rapid charging voltage to be provided is output as long as the last bit of the binary representation of the discrimination signal value is 0, and in implementation, for a control circuit or a control chip, only the last bit of the binary representation of the discrimination signal value needs to occupy resources to maintain, other bits can overflow, and the whole control process can be completed under the condition of very little resource consumption, so that the method is efficient and simple.
In a further implementation, as shown in fig. 3, each of the plurality of USB output ports (1-n) includes an output line Vout for outputting a charging current and for sending an energization feedback signal to the detection circuit.
In a further implementation, as shown in fig. 3, the power supply circuit includes a multi-interface output circuit, a voltage-reducing circuit, a fast charging voltage control circuit, an ac-dc conversion circuit and a voltage transformation circuit, the voltage transformation circuit is electrically connected to the utility power circuit, the voltage transformation circuit is further electrically connected to the voltage-reducing circuit through the ac-dc conversion circuit, a control end of the voltage-reducing circuit is electrically connected to the fast charging voltage control circuit, an output end of the voltage-reducing circuit is electrically connected to the multi-interface output circuit, an output end of the multi-interface output circuit is electrically connected to an output line Vout of each USB output port, and an output end of the multi-interface output circuit outputs a charging current to the output line Vout of each USB output port.
In a further implementation, as shown in fig. 3, the detection circuit includes a counting circuit and a feedback power-on signal circuit, the counting circuit is electrically connected to the feedback power-on signal circuit, the feedback power-on signal circuit is configured with a plurality of input terminals p1-pn, the input terminals of the feedback power-on signal circuit are electrically connected to the output line Vout of each USB output port, and the input terminal of one feedback power-on signal circuit is electrically connected to the output line Vout corresponding to one USB output port, the output line Vout is specifically configured to send a power-on feedback signal to the input terminal of the feedback power-on signal circuit, and the counting circuit is configured to obtain a power-on line count with the power-on feedback signal and send the power-on line count to the control circuit.
In a further embodiment, as shown in fig. 3, the control circuit includes a control ic, the control ic at least configures a counting feedback terminal and a control terminal, the control ic is electrically connected with the counting circuit of the detection circuit through the counting feedback end and obtains the counting of the power-on circuit, the control ic is electrically connected with the input end of the quick charge voltage control circuit through the control end, the control end which only judges that the last bit of binary representation of the signal value is 1 control ic outputs a command signal which does not allow the quick charge voltage to be provided to the input end of the quick charge voltage control circuit in the power supply circuit, the control end which only judges that the last bit of binary representation of the signal value is 0 control ic outputs a command signal which allows the quick charge voltage to be provided to the input end of the quick charge voltage control circuit in the power supply circuit, and the quick charge voltage control circuit adjusts the voltage reduction circuit according to the command signal.
According to one or more implementations illustrated in fig. 3, it can be seen that the multi-output-port fast charging switching circuit of the present application has a relatively simple circuit configuration and control signal/circuit and good logic, and the control of the signal timing sequence is simple and convenient to expand the output ports, and the fast charging control unit does not need to be replaced when the output ports need to be expanded.
In a further embodiment, said plurality of USB outlets (1-n) comprises USB outlets of the USB Standard-A type
In a more specific embodiment, the fast charging voltage comprises 5.5 volts, and the common voltage comprises 5 volts.
In a specific implementation, the method for switching a multi-output-port fast charge switching circuit or the method for switching a multi-output-port fast charge switching circuit of the present application includes the following steps:
the detection circuit detects the output line of each USB output port and forms an electrifying feedback signal, and the electrifying feedback signal is used for acquiring the electrifying circuit count and sending the electrifying circuit count to the control circuit;
the control circuit calculates the value of the discrimination signal according to the counting of the electrified circuit so as to determine whether a command signal allowing the power supply circuit to provide the quick charging voltage is sent or not;
wherein, the control circuit counts the process of calculating the distinguishing signal value according to the electrified circuit:
the initial value of the signal is judged to be 0 or 0b0 in decimal, when the USB output port is increased, the counting of the electrified circuit is increased, and the counting of the electrified circuit is decimalWhen n is produced, the signal value is judged to be 2 of decimal quantityn-1-1, and the discrimination signal value is represented by binary;
the control circuit judges: outputting a command signal not allowing the supply of the fast charging voltage to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 1, and outputting a command signal allowing the supply of the fast charging voltage to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 0;
when the USB output port is reduced, the number of the electrified lines is reduced, as long as the number of the electrified lines is not 1, the last bit of the binary representation of the distinguishing signal value is maintained to be 1, and other bits can overflow until the number of the electrified lines is reduced to 1 or 0, the last bit of the binary representation of the distinguishing signal value is set to be 0;
and during the reduction of the USB output port, the control circuit judges that: a command signal not allowing the supply of the fast charging voltage is output to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 1, and a command signal allowing the supply of the fast charging voltage is output to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 0.
It can be seen that the fast charge circuit of the present application has a short control time and a very high sensitivity, and the circuit or method of the present application outputs a command signal that does not allow the provision of the fast charge voltage as long as the last bit of the binary representation of the discrimination signal value is 1, outputs a command signal that allows the provision of the fast charge voltage as long as the last bit of the binary representation of the discrimination signal value is 0, and actually only needs to occupy resources for the last bit of the binary representation of the discrimination signal value to maintain, and other bits can overflow for the control circuit or the control chip in implementation, and can complete the whole control process with very little resource consumption, and is efficient and simple.

Claims (8)

1. A multi-output-port quick-charging switching circuit is characterized by comprising a power supply circuit, a control circuit and a plurality of USB output ports (1-n)The power circuit is electrically connected with each USB output port and provides a quick charging voltage or a common charging voltage, the plurality of USB output ports (1-n) are electrically connected with a detection circuit, the detection circuit is used for detecting an output line of each USB output port and forming an electrifying feedback signal, the detection circuit is electrically connected with a control circuit, the control circuit is also electrically connected with the power circuit, the detection circuit is used for acquiring the counting of the electrifying circuit according to the electrifying feedback signal and sending the counting of the electrifying circuit to the control circuit, and the control circuit calculates a judgment signal value according to the counting of the electrifying circuit so as to determine whether a command signal allowing the quick charging voltage to be provided is sent to the power circuit; the control circuit calculates the value of the discrimination signal according to the counting of the electrified circuit so as to determine whether to send a command signal which allows the power circuit to provide the quick charging voltage, and specifically comprises the following steps: the value of the discrimination signal is initially 0 or 0b0 decimal, when the number of the electrified circuit is increased, the number of the electrified circuit is increased to 1, the value of the discrimination signal is still 0b0, when the number of the electrified circuit is increased to 2, the value of the discrimination signal is continuously increased to 0b1, when the number of the electrified circuit is increased to 3, the value of the discrimination signal is continuously increased to 0b11, namely when the number of the electrified circuit is n decimal, the value of the discrimination signal is 2 decimaln-1-1, and the discrimination signal value is represented by binary; outputting a command signal that does not allow the provision of the fast charging voltage as long as the last bit of the binary representation of the discrimination signal value is 1, and outputting a command signal that allows the provision of the fast charging voltage as long as the last bit of the binary representation of the discrimination signal value is 0; when the pass line count is decremented, the last bit of the binary representation of the decision signal value is maintained as 1 as long as there is a pass line count that is not 1, and the other bits can overflow until the last bit of the binary representation of the decision signal value is set to 0 as long as the pass line count is decremented to 1 or 0.
2. A multi-outlet fast-charging switching circuit according to claim 1, wherein each of the plurality of USB outlets (1-n) includes an output line Vout, the output line Vout being configured to output a charging current and being configured to send an energization feedback signal to the detection circuit.
3. The multi-output-port fast charging switching circuit according to claim 2, wherein the power circuit comprises a multi-interface output circuit, a voltage reduction circuit, a fast charging voltage control circuit, an ac-dc conversion circuit and a voltage transformation circuit, the voltage transformation circuit is electrically connected to the utility power circuit, the voltage transformation circuit is further electrically connected to the voltage reduction circuit through the ac-dc conversion circuit, a control terminal of the voltage reduction circuit is electrically connected to the fast charging voltage control circuit, an output terminal of the voltage reduction circuit is electrically connected to the multi-interface output circuit, an output terminal of the multi-interface output circuit is electrically connected to the output line Vout of each USB output port, and an output terminal of the multi-interface output circuit outputs a charging current to the output line Vout of each USB output port.
4. The multi-outlet fast-charging switching circuit as claimed in claim 3, wherein the detection circuit includes a counting circuit and a feedback power-on signal circuit, the counting circuit is electrically connected to the feedback power-on signal circuit, the feedback power-on signal circuit is configured with a plurality of input terminals p1-pn, the input terminal of the feedback power-on signal circuit is electrically connected to the output line Vout of each USB outlet, and the input terminal of one feedback power-on signal circuit is electrically connected to the output line Vout corresponding to one USB outlet, the output line Vout is specifically configured to send a power-on feedback signal to the input terminal of the feedback power-on signal circuit, and the counting circuit is configured to obtain a power-on line count with the power-on feedback signal and send the power-on line count to the control circuit.
5. The multi-outlet fast charge switching circuit according to claim 4, wherein the control circuit comprises a control ic, the control ic is configured with at least a counting feedback terminal and a control terminal, the control ic is electrically connected to the counting circuit of the detection circuit through the counting feedback terminal and obtains the counting of the power-on line, the control ic is electrically connected to the input terminal of the fast charge voltage control circuit through the control terminal, the control terminal of the control ic outputs a command signal not allowing the fast charge voltage to be provided to the input terminal of the fast charge voltage control circuit in the power circuit as long as the last bit of the binary representation of the determination signal value is 1, and the control terminal of the control ic outputs a command signal allowing the fast charge voltage to be provided to the input terminal of the fast charge voltage control circuit in the power circuit as long as the last bit of the binary representation of the determination signal value is 0, and the quick charging voltage control circuit adjusts the voltage reduction circuit according to the command signal.
6. A multi-outlet fast-charging switching circuit according to claim 1, wherein said plurality of USB outlets (1-n) comprises USB outlets of USB Standard-a type.
7. A multi-outlet fast charge switching circuit according to claim 1, wherein said fast charge voltage comprises 5.5 volts and said common voltage comprises 5 volts.
8. A method of switching between fast charging and fast charging using a multiple output port fast charging switching circuit as claimed in claim 2, comprising the steps of:
the detection circuit detects the output line of each USB output port and forms an electrifying feedback signal, and the electrifying feedback signal is used for acquiring the electrifying circuit count and sending the electrifying circuit count to the control circuit;
the control circuit calculates the value of the discrimination signal according to the counting of the electrified circuit so as to determine whether a command signal allowing the power supply circuit to provide the quick charging voltage is sent or not;
wherein, the control circuit counts the process of calculating the distinguishing signal value according to the electrified circuit:
the initial value of the signal is 0 or 0b0 decimal, when the USB output port is increased, the counting of the electrified circuit is increased, and when the counting of the electrified circuit is n decimal, the value of the signal is 2 decimaln-1-1, and the value of the discrimination signal is binaryRepresents;
the control circuit judges: outputting a command signal not allowing the supply of the fast charging voltage to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 1, and outputting a command signal allowing the supply of the fast charging voltage to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 0;
when the USB output port is reduced, the number of the electrified lines is reduced, as long as the number of the electrified lines is not 1, the last bit of the binary representation of the distinguishing signal value is maintained to be 1, and other bits can overflow until the number of the electrified lines is reduced to 1 or 0, the last bit of the binary representation of the distinguishing signal value is set to be 0;
and during the reduction of the USB output port, the control circuit judges that: a command signal not allowing the supply of the fast charging voltage is output to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 1, and a command signal allowing the supply of the fast charging voltage is output to the power supply circuit as long as the last bit of the binary representation of the discrimination signal value is 0.
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CN101295883A (en) * 2007-04-29 2008-10-29 葛铮 Recovery and quick charge device of lead acid accumulator
CN103858311A (en) * 2011-10-04 2014-06-11 丰田自动车株式会社 Electrical charging control apparatus and electrical charging method
WO2017179826A1 (en) * 2016-04-15 2017-10-19 엘지이노텍(주) Fo detection method and device and system therefor
CN110875616A (en) * 2018-09-04 2020-03-10 通用汽车环球科技运作有限责任公司 Self-balancing switch control for dual battery rechargeable energy storage systems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1710778A (en) * 2005-06-23 2005-12-21 倚天资讯股份有限公司 Charging device and charging method
CN101295883A (en) * 2007-04-29 2008-10-29 葛铮 Recovery and quick charge device of lead acid accumulator
CN103858311A (en) * 2011-10-04 2014-06-11 丰田自动车株式会社 Electrical charging control apparatus and electrical charging method
WO2017179826A1 (en) * 2016-04-15 2017-10-19 엘지이노텍(주) Fo detection method and device and system therefor
CN110875616A (en) * 2018-09-04 2020-03-10 通用汽车环球科技运作有限责任公司 Self-balancing switch control for dual battery rechargeable energy storage systems

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