CN112531844B - Charging system and charging method suitable for multi-path USB Type-C - Google Patents

Charging system and charging method suitable for multi-path USB Type-C Download PDF

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CN112531844B
CN112531844B CN202011425422.5A CN202011425422A CN112531844B CN 112531844 B CN112531844 B CN 112531844B CN 202011425422 A CN202011425422 A CN 202011425422A CN 112531844 B CN112531844 B CN 112531844B
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CN112531844A (en
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欧应阳
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Hynetek Semiconductor 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
    • H02J7/007—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
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/30—Charge provided using DC bus or data bus of a computer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a charging system and a charging method suitable for multi-path USB Type-C, which comprises the following steps: power module, Type-C voltage conversion module and Type-C port, Type-C voltage conversion module includes: the device comprises a step-down power circuit, a VBUS feedback control circuit, a single bus communication circuit and a VINT feedback control circuit, wherein the VBUS feedback control circuit acquires a target voltage Vref of a Type-C port connected with a load and a voltage value of an output voltage VBUS, controls the voltage value of the output voltage VBUS to be consistent with the voltage value of the target voltage Vref, and receives the voltage value of the target voltage Vref of the Type-C port and voltage values of target voltages Vref _ n of other Type-C ports; comparing the target voltage value Vref with the target voltage value Vref _ n, and outputting an adjusted voltage target value VINT _ Ref; adjusting the voltage value of the direct current voltage VIN to be consistent with the target value VIN _ Ref of the adjusted voltage through a VINT feedback compensation circuit; have and to change dynamic adjustment output voltage according to the voltage of Type-C port, and the higher beneficial effect of conversion efficiency is applicable to Type-C charging circuit's technical field.

Description

Charging system and charging method suitable for multi-path USB Type-C
Technical Field
The invention belongs to the technical field of Type-C charging circuits, and particularly relates to a charging system and a charging method suitable for multi-path USB Type-C.
Background
Universal Serial Bus (USB) is a Serial Bus standard for connecting computer systems and external devices, and is also a technical specification of input/output interfaces, and is widely used in information communication products such as personal computers and mobile devices, and is extended to other related fields such as video equipment, digital televisions (set-top boxes), game machines, and the like.
The traditional USB is a common interface, which only has 4 lines, two power lines and two signal lines, and the maximum output voltage and current of the USB interface are: 5V/1.5A; the signal is transmitted in a serial mode, the speed can reach 480Mbps, and various industrial and civil requirements can be met.
Along with the increasingly strict requirements of the mobile equipment on transmission rate, charging power and interface size, a new generation of USB interface USB Type-C (Type-C for short) arises; USB Type-C is a Universal Serial Bus (USB) hardware interface specification; the new version of interface is highlighted by a slimmer design, faster transmission speed (up to 40 Gbps), and more aggressive power transmission (up to 100W); the Type-C supports double-sided insertion of a USB interface, formally solves the worldwide problem of 'the USB can not be inserted for all the time', and the front side and the back side can be inserted randomly; meanwhile, the USB data line used with the USB data line is also thinner and lighter.
In order to support the output Power of 100W at most, the matched USB Power Delivery Specification (USB PD) is also proposed later; the USB PD protocol provides that the power supply terminal and the power supply equipment can negotiate through the communication protocol of the PD to determine the appropriate voltage which can be provided by the power supply terminal to the equipment, the power supply terminal informs the equipment terminal of the voltage gear which can be provided by the power supply terminal through PD broadcasting, and the equipment terminal can request any one of the selected voltage gears according to the self requirement.
The USB PD protocol can bear 3A or 5A current, the output voltage is up to 20V, meanwhile, a special channel for power transmission protocol communication is defined in an interface, intelligent self-adaptive charging adjustment can be completed between charging equipment and powered equipment, and the charging efficiency is improved; the USB PD protocol and one output Type-C port are adopted, and one device can be charged.
With the gradual increase of devices supporting Type-C ports, a plurality of Type-C ports exist on one adapter, and the charging of a plurality of devices becomes possible; however, in the prior art, the problem of over-high power generally exists for the application of one adapter with a plurality of Type-C ports.
Such as: in the first prior art scheme provided in fig. 1, n independent AC/DC power supplies (AC-DC modules) are used to supply power to n Type-C ports, respectively, and the inputs of the n AC-DC modules are input ends of an adapter and are connected to an AC mains supply; each Type-C port is provided with a corresponding PD chip which carries out protocol handshake with the equipment (through a CC line), and after the equipment is accessed into the Type-C port, the output voltage required by the equipment is determined through a USB PD protocol; the PD chip is connected with the AC-DC through the FB, and the FB can directly regulate the output voltage VOUT of the AC-DC module to achieve a target voltage value required by equipment;
in this solution, there are problems: n independent AC-DC modules are needed, so that the designed power circuit is n times of the actual requirement; for realizing the maximum 60W output power of a single port, if a two-way Type-C output adapter is used, two AC-DC output adapters are required to output 60W, namely the total design power of the adapter is 120W. The cost, the volume and the weight of the system are greatly increased, and the power device is low in utilization rate and poor in economical efficiency under most use scenes.
The total design power needs to meet the following table:
Figure DEST_PATH_IMAGE001
the following steps are repeated: in the second prior art scheme provided in fig. 2, a two-stage power supply mode is adopted, alternating current mains supply is firstly converted into a fixed intermediate bus voltage Vint through an alternating current-direct current converter AC-DC module, the voltage is used as an intermediate bus, and the rear side of the intermediate bus is connected in parallel with n-way buck converters; each path of buck converter is connected with an independent Type-C output; each Type-C port is provided with a corresponding PD chip which carries out protocol handshake with the equipment (through a CC line), and after the equipment is accessed into the Type-C port, the output voltage required by the equipment is determined through a USB PD protocol; the PD chip is connected with the buck converter through FB, and the FB can directly regulate the output voltage VOUT of the buck converter to achieve the target voltage value required by equipment.
Compared with the prior art scheme I, the power magnetic element is greatly reduced by only one AC-DC module, but the voltage of the middle bus needs to be fixed to be larger than the maximum voltage output by any Type-C port. This results in: under the condition that the equipment is not accessed, the AC-DC still needs to output the maximum voltage, so that the standby power consumption of the system is high; in addition, after the device is connected, if the output voltage of each path of buck converter is the output minimum voltage, and the input voltage of each path of buck converter is fixed, in this case, the system efficiency is poor.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: the charging system and the charging method which can dynamically adjust the output voltage according to the voltage change of the Type-C port and have high conversion efficiency and are suitable for the multi-path USB Type-C are provided.
In order to solve the technical problems, the invention adopts the technical scheme that:
a charging system suitable for multichannel USB Type-C, includes: the power supply comprises a power supply module and a plurality of Type-C voltage conversion modules connected with the power supply module, wherein each Type-C voltage conversion module is correspondingly connected with a Type-C port for connecting a load;
the power supply module is used for outputting direct current voltage Vint;
each Type-C voltage conversion module all include:
the voltage reduction power circuit is used for converting the direct current voltage Vint into an output voltage VBUS;
the VBUS feedback control circuit is used for acquiring the voltage value of a target voltage Vref of a Type-C port connected with a load, acquiring the voltage value of an output voltage VBUS, and controlling the voltage value of the output voltage VBUS to be consistent with the voltage value of the target voltage Vref through the VBUS feedback compensation circuit; detecting whether the voltage value of the target voltage Vref of the Type-C port is updated or not, and outputting an updated digital quantity if the voltage value of the target voltage Vref of the Type-C port is updated;
the single-bus communication circuit is in communication connection with the single-bus communication circuits of other Type-C voltage conversion modules, and is used for receiving the updated digital quantity and broadcasting the digital quantity so that all other single-bus communication circuits can receive the updated digital quantity;
the VINT feedback control circuit is used for receiving the voltage value of the target voltage Vref of the Type-C port output by the VBUS feedback control circuit and receiving the voltage values of the target voltages Vref _ n of other Type-C ports;
comparing the target voltage value Vref of the Type-C port with the target voltage values Vref _ n of other Type-C ports through a VINT _ Ref selection circuit to output an adjustment voltage target value VINT _ Ref;
the voltage value of the regulated direct current voltage VINT is consistent with the regulated voltage target value VINT _ Ref through the VINT feedback compensation circuit.
Optionally, in the VINT feedback control circuit, the voltage value of the adjusted voltage target value VINT _ Ref is greater than or equal to the target voltage value Vref of the Type-C port.
Optionally, the VINT _ Ref selection circuit specifically includes:
comparing the voltage value of the target voltage Vref of the Type-C port with the voltage values of the target voltages Vref _ n of other Type-C ports;
when the voltage value of the target voltage Vref is equal to the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the VINT _ Ref selection circuit outputs an adjusted voltage target value VINT _ Ref = Vref'; wherein: the Vref '= Vref or Vref' = Vret + VINT _ Offset; the VINT _ Offset is an Offset voltage;
when the voltage value of the target voltage Vref is less than the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the regulated voltage target value VINT _ Ref = Vref _ Max output by the VINT _ Ref selection circuit; wherein: vref _ Max is a preset voltage, and the voltage value of the preset voltage is larger than or equal to the maximum voltage output by all Type-C ports under all normal working conditions.
Correspondingly, the charging method suitable for the multiple USB Type-C comprises the following steps: the power supply comprises a power supply module and a plurality of Type-C voltage conversion modules connected with the power supply module, wherein each Type-C voltage conversion module is correspondingly connected with a Type-C port for connecting a load; each Type-C voltage conversion module is provided with a voltage reduction power circuit, a VBUS feedback control circuit, a single bus communication circuit and a VINT feedback control circuit; after one Type-C port is connected with a load, the method comprises the following steps:
s10, the power supply module outputs a direct current voltage Vint;
s20, the voltage reduction power circuit converts the initial direct current voltage Vint into an output voltage VBUS;
s30, the VBUS feedback control circuit obtains the voltage value of the target voltage Vref of the Type-C port connected with the load and the voltage value of the output voltage VBUS, and controls the voltage value of the output voltage VBUS to be consistent with the voltage value of the target voltage Vref through the VBUS feedback compensation circuit; detecting whether the voltage value of the target voltage Vref of the Type-C port is updated or not, and outputting an updated digital quantity if the voltage value of the target voltage Vref of the Type-C port is updated;
s40, the single bus communication circuit is in communication connection with the single bus communication circuits of other Type-C voltage conversion modules; when receiving the updated digital quantity, broadcasting so that all other single-bus communication circuits can receive the updated digital quantity;
s50, the VINT feedback control circuit receives the voltage value of the target voltage Vref of the Type-C port output by the VBUS feedback control circuit and receives the voltage values of the target voltages Vref _ n of other Type-C ports; comparing the target voltage value Vref of the Type-C port with the target voltage values Vref _ n of other Type-C ports through a VINT _ Ref selection circuit to output an adjustment voltage target value VINT _ Ref; the voltage value of the regulated direct current voltage VINT is consistent with the regulated voltage target value VINT _ Ref through the VINT feedback compensation circuit.
Optionally, in the step S50, the voltage value of the adjustment voltage target value VINT _ Ref is greater than or equal to the target voltage value Vref of the Type-C port.
Optionally, in step S50, the VINT _ Ref selecting circuit compares the target voltage value Vref of the Type-C port with the target voltage values Vref _ n of the other Type-C ports to output the adjusted voltage target value VINT _ Ref, and specifically includes:
comparing the voltage value of the target voltage Vref of the Type-C port with the voltage values of the target voltages Vref _ n of other Type-C ports;
when the voltage value of the target voltage Vref is equal to the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the VINT _ Ref selection circuit outputs an adjusted voltage target value VINT _ Ref = Vref'; wherein: the Vref '= Vref, or Vref' = Vret + VINT _ Offset; the VINT _ Offset is an Offset voltage;
when the voltage value of the target voltage Vref is less than the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the regulated voltage target value VINT _ Ref = Vref _ Max output by the VINT _ Ref selection circuit; wherein: vref _ Max is a preset voltage, and the voltage value of the preset voltage is larger than or equal to the maximum voltage output by all Type-C ports under all normal working conditions.
Optionally, in step S30, the controlling, by the VBUS feedback compensation circuit, that the voltage value of the output voltage VBUS is consistent with the voltage value of the target voltage Vref includes:
and comparing the difference between the voltage value of the target voltage Vref of the Type-C port and the voltage value of the output voltage VBUS, and adjusting the magnitude of the output value PWM through a differential amplification circuit to adjust the voltage value of the output voltage VBUS so that the voltage value of the output voltage VBUS is equal to the voltage value of the target voltage Vref.
Optionally, in step S10, the outputting, by the power supply module, the direct-current voltage Vint specifically includes:
the input end of the rectifier bridge is connected with the alternating current power supply end, the output end of the rectifier bridge is connected with the input end of the voltage conversion circuit, and the control end of the voltage conversion circuit is connected with the output end of the VINT feedback control circuit.
Optionally, an isolated power supply is disposed on the voltage conversion circuit.
Optionally, the voltage conversion circuit is at least one of a flyback circuit, a forward circuit, and a boost circuit + LLC circuit.
Compared with the prior art, the invention has the following beneficial effects:
according to the charging system and the charging method suitable for the multiple USB Type-C ports, the target output voltage of each Type-C port can be updated in real time according to the single-bus communication circuit, the Vint voltage is dynamically adjusted, the voltage difference between the Vint voltage and the VBUS voltage is kept in a minimum range, and the overall efficiency of the system is improved; meanwhile, the scheme also solves the problem that a plurality of feedback circuits control one feedback quantity at the same time, the plurality of feedback circuits are not disconnected from the circuit, but are realized by switching references, and the stability of the Vint voltage is ensured when the voltages of different output Type-C ports are changed and adjusted; simultaneously, when each Type-C port inserts the load alone, still can export with the maximum output power, make full use of power device, improved user experience, the practicality is extremely strong.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings;
FIG. 1 is a schematic structural diagram of a Type-C charging interface circuit in the prior art;
FIG. 2 is a schematic diagram of another Type-C charging interface circuit in the prior art;
fig. 3 is a schematic block diagram of a charging system suitable for multiple USB Type-C according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of dynamically adjusting voltage in a charging system suitable for multiple USB Type-C according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a charging method suitable for multiple USB Type-C according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a power module in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention;
fig. 7 is a schematic circuit diagram of a buck power circuit in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention;
fig. 8 is a schematic block diagram of a VBUS feedback control circuit in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention;
fig. 9 is a schematic circuit diagram of a VBUS feedback compensation circuit in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention;
FIG. 10 is a schematic circuit diagram of a VINT feedback control circuit in a charging method suitable for multiple USB Type-C devices according to a second embodiment of the present invention;
fig. 11 is a flowchart illustrating a step S50 in the charging method for multiple USB Type-C according to the first embodiment of the present invention;
fig. 12 is a schematic circuit diagram of a VINT feedback control circuit controlling a dc voltage VINT in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention;
fig. 13 is a circuit connection diagram of each single-bus communication circuit in the charging method suitable for multiple USB Type-C according to the second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
To facilitate an understanding of the embodiments of the present disclosure, the following detailed description is to be considered in conjunction with the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present disclosure.
In one embodiment of the invention:
fig. 3 is a schematic block diagram of a charging system suitable for multiple USB Type-C according to an embodiment of the present invention; fig. 4 is a schematic block diagram of dynamically adjusting voltage in a charging system suitable for multiple USB Type-C according to an embodiment of the present invention; as shown in fig. 3 and 4, a charging system suitable for multiple USB Type-C includes: the power supply comprises a power supply module and a plurality of Type-C voltage conversion modules connected with the power supply module, wherein each Type-C voltage conversion module is correspondingly connected with a Type-C port for connecting a load;
in the specific implementation process, the Type-C voltage conversion modules can be multiple, and include: the device comprises a Type-C voltage conversion module 1, a Type-C voltage conversion module 2, … and a Type-C voltage conversion module n; correspondingly, the Type-C port can also be a plurality of, including: Type-C port 1, Type-C port 2, …, Type-C port n.
In this embodiment, the power module is configured to output a dc voltage Vint;
each of the Type-C voltage conversion modules includes:
the voltage reduction power circuit is used for converting the direct current voltage Vint into an output voltage VBUS;
the VBUS feedback control circuit is used for acquiring the voltage value of the target voltage Vref of the Type-C port 30 connected with the load, acquiring the voltage value of the output voltage VBUS, and controlling the voltage value of the output voltage VBUS to be consistent with the voltage value of the target voltage Vref through the VBUS feedback compensation circuit; detecting whether the voltage value of the target voltage Vref of the Type-C port is updated or not, and outputting an updated digital quantity if the voltage value of the target voltage Vref of the Type-C port is updated;
the single-bus communication circuit is in communication connection with the single-bus communication circuits of other Type-C voltage conversion modules through a bus, and is used for receiving the updated digital quantity and broadcasting the digital quantity on the bus, so that all other single-bus communication circuits can receive the updated digital quantity;
the VINT feedback control circuit is used for receiving the voltage value of the target voltage Vref of the Type-C port output by the VBUS feedback control circuit and receiving the voltage values of the target voltages Vref _ n of other Type-C ports;
comparing the target voltage value Vref of the Type-C port with the target voltage values Vref _ n of other Type-C ports through a VINT _ Ref selection circuit to output an adjustment voltage target value VINT _ Ref;
the voltage value of the regulated direct current voltage VINT is consistent with the regulated voltage target value VINT _ Ref through the VINT feedback compensation circuit.
Specifically, in the VINT feedback control circuit, the voltage value of the adjustment voltage target value VINT _ Ref is equal to or greater than the target voltage value Vref of the Type-C port.
Further, the VINT _ Ref selection circuit specifically includes:
comparing the voltage value of the target voltage Vref of the Type-C port with the voltage values of the target voltages Vref _ n of other Type-C ports;
when the voltage value of the target voltage Vref is equal to the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the VINT _ Ref selection circuit outputs an adjusted voltage target value VINT _ Ref = Vref'; wherein: the Vref '= Vref or Vref' = Vret + VINT _ Offset; the VINT _ Offset is an Offset voltage;
when the voltage value of the target voltage Vref is less than the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the regulated voltage target value VINT _ Ref = Vref _ Max output by the VINT _ Ref selection circuit; wherein: vref _ Max is a preset voltage, and the voltage value of the preset voltage is larger than or equal to the maximum voltage output by all Type-C ports under all normal working conditions.
In this embodiment, if the Vref values of multiple Type-C ports are equal to the maximum value, a default may be made to determine according to the port identifier, for example, the Vref values of 1, 2, and 5 ports are equal to the maximum value, and if the port identifier is the smallest, then it is the maximum value of port 1, or if the port identifier is the largest, then it is the maximum value of port 5.
Fig. 5 is a schematic flowchart of a charging method suitable for multiple USB Type-C according to an embodiment of the present invention; as shown in fig. 5, a charging method suitable for multiple USB Type-C includes: the power supply comprises a power supply module and a plurality of Type-C voltage conversion modules connected with the power supply module, wherein each Type-C voltage conversion module is correspondingly connected with a Type-C port for connecting a load; the method is characterized in that: each Type-C voltage conversion module is provided with a voltage reduction power circuit, a VBUS feedback control circuit, a single bus communication circuit and a VINT feedback control circuit; after one Type-C port is connected with a load, the method comprises the following steps:
s10, the power supply module outputs a direct current voltage Vint;
s20, the voltage reduction power circuit converts the initial direct current voltage Vint into an output voltage VBUS;
s30, the VBUS feedback control circuit obtains the voltage value of the target voltage Vref of the Type-C port connected with the load and the voltage value of the output voltage VBUS, and controls the voltage value of the output voltage VBUS to be consistent with the voltage value of the target voltage Vref through the VBUS feedback compensation circuit; detecting whether the voltage value of the target voltage Vref of the Type-C port is updated or not, and outputting an updated digital quantity if the voltage value of the target voltage Vref of the Type-C port is updated;
s40, the single bus communication circuit is in communication connection with the single bus communication circuits of other Type-C voltage conversion modules through the bus; when receiving the updated digital quantity, broadcasting on the bus to enable all other single-bus communication circuits to receive the updated digital quantity;
s50, the VINT feedback control circuit receives the voltage value of the target voltage Vref of the Type-C port output by the VBUS feedback control circuit and receives the voltage values of the target voltages Vref _ n of other Type-C ports; comparing the target voltage value Vref of the Type-C port with the target voltage values Vref _ n of other Type-C ports through a VINT _ Ref selection circuit to output an adjustment voltage target value VINT _ Ref; the voltage value of the regulated direct current voltage VINT is consistent with the regulated voltage target value VINT _ Ref through the VINT feedback compensation circuit.
Specifically, in step S50, the voltage value of the adjustment voltage target value VINT _ Ref is equal to or greater than the target voltage value Vref of the Type-C port.
Further, in step S50, the method for selecting the VINT _ Ref includes comparing the target voltage Vref of the Type-C port with the target voltage Vref _ n of the other Type-C ports to output an adjusted voltage target value VINT _ Ref, which specifically includes:
comparing the voltage value of the target voltage Vref of the Type-C port with the voltage values of the target voltages Vref _ n of other Type-C ports;
when the voltage value of the target voltage Vref is equal to the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the VINT _ Ref selection circuit outputs an adjusted voltage target value VINT _ Ref = Vref'; wherein: the Vref '= Vref, or Vref' = Vret + VINT _ Offset; the VINT _ Offset is an Offset voltage;
when the voltage value of the target voltage Vref is less than the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the regulated voltage target value VINT _ Ref = Vref _ Max output by the VINT _ Ref selection circuit; wherein: vref _ Max is a preset voltage, and the voltage value of the preset voltage is larger than or equal to the maximum voltage output by all Type-C ports under all normal working conditions.
In this embodiment, in the step S30, the controlling, by the VBUS feedback compensation circuit, that the voltage value of the output voltage VBUS is consistent with the voltage value of the target voltage Vref specifically includes:
and comparing the difference between the voltage value of the target voltage Vref of the Type-C port and the voltage value of the output voltage VBUS, and adjusting the magnitude of the output value PWM through a differential amplification circuit to adjust the voltage value of the output voltage VBUS so that the voltage value of the output voltage VBUS is equal to the voltage value of the target voltage Vref.
According to the charging system and the charging method suitable for the multiple USB Type-C ports, the target output voltage of each Type-C port can be updated in real time according to the single-bus communication circuit, the Vint voltage is dynamically adjusted, the voltage difference between the Vint voltage and the VBUS voltage is kept in a minimum range, and the overall efficiency of the system is improved; meanwhile, the scheme also solves the problem that a plurality of feedback circuits control one feedback quantity at the same time, the plurality of feedback circuits are not disconnected from the circuit, but are realized by switching references, and the stability of the Vint voltage is ensured when the voltages of different output Type-C ports are changed and adjusted; meanwhile, when each Type-C port is independently inserted into a load, the output can still be carried out with the maximum output power, power devices are fully utilized, and user experience is improved.
Example two
Fig. 6 is a schematic circuit diagram of a power module in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention; as shown in fig. 6, in step S10, the outputting, by the power module, a dc voltage Vint specifically includes: the input end of the rectifier bridge is connected with the alternating current power supply end, the output end of the rectifier bridge is connected with the input end of the voltage conversion circuit, and the control end of the voltage conversion circuit is connected with the output end of the VINT feedback control circuit.
The power module in this embodiment can convert an ac power supply into a dc voltage Vint, and provide power supply for each Type-C voltage conversion module, where the dc voltage Vint is controlled by a Vint feedback control circuit.
Specifically, an isolated power supply is arranged on the voltage conversion circuit.
Further, the voltage conversion circuit is at least one of a flyback circuit, a forward circuit, a boost circuit and an LLC circuit.
The power module in the invention can also be arranged in other forms, such as: the voltage conversion circuit can be a flyback circuit with active clamping, a forward circuit with active clamping and the like; in addition, the diode in this embodiment may also be replaced by a switching tube, such as MOSFET, BJT, IGBT, etc., to reduce the power loss caused by the conduction of the diode.
Fig. 7 is a schematic circuit diagram of a buck power circuit in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention; as shown in fig. 7, the step-down power circuit is configured to convert the dc voltage Vint into an output voltage VBUS (lower voltage) of the Type-C port; in the embodiment, each Type-C port corresponds to one buck power circuit; in this embodiment, the actual output voltage of the step-down power voltage is determined by the VBUS feedback control circuit.
Fig. 8 is a schematic block diagram of a VBUS feedback control circuit in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention; as shown in fig. 8, the VBUS feedback control circuit communicates with the Type-C port (via a CC line) to obtain a target voltage Vref, samples the VBUS voltage, and controls the buck power circuit to achieve that the VBUS voltage reaches the target voltage value negotiated via the Type-C port after passing through the VBUS feedback compensation circuit;
the Type-C module in this embodiment is a port control module dedicated to a Type-C port, and is responsible for detecting the plugging and unplugging of a Type-C port device, receiving and sending USB PD communication, and determining a target voltage Vref to be output by the Type-C port according to a result of negotiation between the Type-C port and an external device; vref may also be in direct proportion to the target output voltage to ensure that the feedback compensation circuit formally recognizes the target output voltage; in addition, Vref is used for the VBUS feedback compensation circuit to control the VBUS voltage and is also transmitted to the VINT feedback control circuit to participate in the control of VINT; and detecting whether the voltage value of the target voltage Vref of the Type-C port is updated or not, and if so, outputting the updated digital quantity and the digital quantity thereof to the single-bus communication circuit.
Fig. 9 is a schematic circuit diagram of a VBUS feedback compensation circuit in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention; as shown in fig. 9, in the VBUS feedback compensation circuit, the actual output voltage VBUS and the target output voltage Vref are sampled, and the error amplification unit in the VBUS feedback compensation circuit compares the error value of VBUS with Vref, and changes the value of VBUS voltage by adjusting the PWM signal, so that the VBUS voltage is finally adjusted to Vref.
FIG. 10 is a schematic circuit diagram of a VINT feedback control circuit in a charging method suitable for multiple USB Type-C devices according to a second embodiment of the present invention; fig. 11 is a flowchart illustrating a step S50 in the charging method for multiple USB Type-C according to the first embodiment of the present invention; as shown in fig. 10 and 11, the VINT feedback control circuit includes: when the VINT _ Ref selection circuit and the VINT feedback compensation circuit are used, the VINT feedback control circuit in the embodiment obtains the target voltage Vref of the Type-C port from the VBUS feedback control circuit, and receives the output target voltage Vref1 … n of the other Type-C ports from the single-bus communication circuit; the VINT _ Ref selection circuit compares each received Vrefn with Vref of the Type-C port;
when the Vref of the present Type-C port is equal to the maximum output target voltage of all ports, namely:
Vref= Max(Vref1, Vref2…Vrefn)；
the selection switch of the VINT _ Ref selection circuit is switched to Vref'; vref' may be equal to the target output voltage Vref of the present Type-C port, or equal to the target voltage Vref of the present Type-C port plus a preset Offset voltage VINT _ Offset, as shown in the following equation:
vref '= Vref or Vref' = Vref + VINT _ Offset.
Specifically, the VINT _ Offset is used to compensate for some additional voltage drop that may be caused by the buck power circuit; specifically, the VINT _ Offset can be preset at different values according to different practical applications.
When the Vref of the present Type-C port is not equal to, i.e., less than, the maximum output target voltage of all other Type-C ports, i.e.:
Vref<Max(Vref1, Vref2…Vrefn)；
the selection switch of the VINT _ Ref selection circuit is switched to Vref _ Max, where: vref _ Max is a preset voltage which is more than or equal to the maximum voltage output by all the ports under all normal working conditions; if the VBUS voltage of each Type-C port can output 5-20V, Vref _ Max needs to be preset to 20V or more than 20V.
The VINT _ Ref selection circuit in this embodiment can control the target value VINT _ Ref of the regulated voltage input to the VINT feedback compensation circuit, where VINT _ Ref is used as the input reference of the error amplifier and is the target voltage of the closed-loop regulation VINT; after being sent to the VINT feedback compensation circuit, the VINT _ Ref and the sampled VINT signal form closed loop control, and finally the VINT signal is adjusted to be equal to the VINT _ Ref.
In the VINT feedback control circuit shown in fig. 10, the VINT feedback control circuit samples a dc voltage VINT (or scales a direct proportion VINT), which is used as a feedback voltage, and simultaneously VINT _ Ref is used as an adjusted target voltage to be compared with the sampled dc voltage VINT, after passing through the compensation circuit, the VINT feedback control circuit controls a current flowing through a secondary side of the feedback optocoupler, the current of the optocoupler can be transmitted to a primary side of the optocoupler in a linear proportion, and the current of the primary side of the optocoupler can be used for adjusting the output voltage VINT of the ACDC.
Fig. 12 is a schematic circuit diagram of a VINT feedback control circuit controlling a dc voltage VINT in a charging method suitable for multiple USB Type-C according to a second embodiment of the present invention; as shown in fig. 12, in the present embodiment, a structure of one primary power supply (power supply module) and n secondary power supplies (Type-C voltage conversion modules) is adopted; the n VINT feedback control circuits are connected together through the OPTO and are simultaneously connected into a feedback loop of the power supply module; when the target voltage of the Type-C port is not the highest among all the Type-C ports (Vref ≠ Max (Vref1, Vref2 … Vrefn)), the VINT _ Ref selection circuit can adjust the voltage reference VINT _ Ref in the VINT feedback compensation circuit to Vref _ Max, so that Vref _ Max is always larger than the direct-current voltage VINT, the VINT feedback compensation circuit in the circuit is always in a saturation state, the output OPTO current of the VINT feedback compensation circuit is equal to zero, and the normal adjustment of VINT is not influenced.
Fig. 13 is a circuit connection diagram of each single-bus communication circuit in a charging method suitable for multiple USB Type-C according to the second embodiment of the present invention; as shown in fig. 13, the outputs of the Type-C ports of each channel are connected by a single wire, the single wire is connected to the single-bus communication circuit of each Type-C, when Vref is updated in the Type-C module in the VBUS feedback control circuit, the updated digital quantity is transmitted to the single-bus communication module, and broadcast on the single bus in a digital bus manner, so that the single-bus communication circuits in all other Type-C ports can receive the data.
In this embodiment, the voltage value format of the target voltage Vref in the single-bus communication circuit is a digital quantity, and when the target voltage Vref is finally output to the VBUS feedback compensation circuit or the VINT feedback compensation circuit, the target voltage Vref needs to be converted into an analog quantity through a digital-to-analog converter; or the voltage value of the received target voltage Vref is directly converted into an analog quantity in the single-bus communication circuit, and the analog value is provided for a subsequent circuit.
In the VBUS feedback control circuit and the VINT feedback control circuit, the voltage is shown to be used as the input voltage of the VBUS/VINT feedback compensation circuit after being scaled in a positive proportion (for example, through a resistance voltage division network); in practical applications, the scaling ratio can be any value from 0 to 1, and the scaling ratio is applied to other corresponding parameters in the present invention, such as: vref, VINT _ Ref, etc.
The charging system and the charging method suitable for the multiple USB Type-C can realize two-stage power supply control, and by adopting the technical scheme provided by the invention, the output bus voltage (direct current voltage Vint) of the first-stage power supply can be dynamically adjusted according to the target voltage requested by each Type-C port, so that the efficiency of each path of buck power circuit is improved; meanwhile, the mode of dynamically adjusting the output voltage can realize a feasible structure of controlling single physical quantity by multiple feedback loops, and the practicability is strong.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (8)

1. A charging system suitable for multichannel USB Type-C, includes: the power supply comprises a power supply module and a plurality of Type-C voltage conversion modules connected with the power supply module, wherein each Type-C voltage conversion module is correspondingly connected with a Type-C port for connecting a load; the method is characterized in that:
the power supply module is used for outputting direct current voltage Vint;
each Type-C voltage conversion module all include:
the voltage reduction power circuit is used for converting the direct current voltage Vint into an output voltage VBUS;
the VBUS feedback control circuit is used for acquiring the voltage value of a target voltage Vref of a Type-C port connected with a load, acquiring the voltage value of an output voltage VBUS, and controlling the voltage value of the output voltage VBUS to be consistent with the voltage value of the target voltage Vref through the VBUS feedback compensation circuit; detecting whether the voltage value of the target voltage Vref of the Type-C port is updated or not, and outputting an updated digital quantity if the voltage value of the target voltage Vref of the Type-C port is updated;
the single-bus communication circuit is in communication connection with the single-bus communication circuits of other Type-C voltage conversion modules, and is used for receiving the updated digital quantity and broadcasting the digital quantity so that all other single-bus communication circuits can receive the updated digital quantity;
the VINT feedback control circuit is used for receiving the voltage value of the target voltage Vref of the Type-C port output by the VBUS feedback control circuit and receiving the voltage values of the target voltages Vref _ n of other Type-C ports;
comparing the target voltage value Vref of the Type-C port with the target voltage values Vref _ n of other Type-C ports through a VINT _ Ref selection circuit to output an adjustment voltage target value VINT _ Ref;
the voltage value of the regulated direct-current voltage VINT is consistent with the regulated voltage target value VINT _ Ref through the VINT feedback compensation circuit;
the VINT _ Ref selection circuit specifically comprises:
comparing the voltage value of the target voltage Vref of the Type-C port with the voltage values of the target voltages Vref _ n of other Type-C ports;
when the voltage value of the target voltage Vref is equal to the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the VINT _ Ref selection circuit outputs an adjusted voltage target value VINT _ Ref = Vref'; wherein: the Vref '= Vref or Vref' = Vret + VINT _ Offset; the VINT _ Offset is an Offset voltage;
when the voltage value of the target voltage Vref is less than the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the regulated voltage target value VINT _ Ref = Vref _ Max output by the VINT _ Ref selection circuit; wherein: vref _ Max is a preset voltage, the voltage value of the Vref _ Max is larger than or equal to the maximum voltage output by all Type-C ports under all normal working conditions, the VINT feedback compensation circuit is always in a saturated state, the output OPTO current of the VINT feedback compensation circuit is equal to zero, and the normal regulation of the direct-current voltage VINT cannot be influenced.
2. The charging system suitable for the multiple USB Type-C according to claim 1, wherein: in the VINT feedback control circuit, the voltage value of the target value VINT _ Ref of the adjusting voltage is more than or equal to the target voltage value Vref of the Type-C port.
3. A charging method suitable for multi-path USB Type-C comprises the following steps: the power supply comprises a power supply module and a plurality of Type-C voltage conversion modules connected with the power supply module, wherein each Type-C voltage conversion module is correspondingly connected with a Type-C port for connecting a load; the method is characterized in that: each Type-C voltage conversion module is provided with a voltage reduction power circuit, a VBUS feedback control circuit, a single bus communication circuit and a VINT feedback control circuit; after one Type-C port is connected with a load, the method comprises the following steps:
s10, the power supply module outputs a direct current voltage Vint;
s20, the voltage reduction power circuit converts the initial direct current voltage Vint into an output voltage VBUS;
s30, the VBUS feedback control circuit obtains the voltage value of the target voltage Vref of the Type-C port connected with the load and the voltage value of the output voltage VBUS, and controls the voltage value of the output voltage VBUS to be consistent with the voltage value of the target voltage Vref through the VBUS feedback compensation circuit; detecting whether the voltage value of the target voltage Vref of the Type-C port is updated or not, and outputting an updated digital quantity if the voltage value of the target voltage Vref of the Type-C port is updated;
s40, the single bus communication circuit is in communication connection with the single bus communication circuits of other Type-C voltage conversion modules; when receiving the updated digital quantity, broadcasting so that all other single-bus communication circuits can receive the updated digital quantity;
s50, the VINT feedback control circuit receives the voltage value of the target voltage Vref of the Type-C port output by the VBUS feedback control circuit and receives the voltage values of the target voltages Vref _ n of other Type-C ports; comparing the target voltage value Vref of the Type-C port with the target voltage values Vref _ n of other Type-C ports through a VINT _ Ref selection circuit to output an adjustment voltage target value VINT _ Ref; the voltage value of the regulated direct-current voltage VINT is consistent with the regulated voltage target value VINT _ Ref through the VINT feedback compensation circuit;
in step S50, the VINT _ Ref selecting circuit compares the target voltage value Vref of the Type-C port with the target voltage values Vref _ n of the other Type-C ports to output an adjusted voltage target value VINT _ Ref, and specifically includes:
comparing the voltage value of the target voltage Vref of the Type-C port with the voltage values of the target voltages Vref _ n of other Type-C ports;
when the voltage value of the target voltage Vref is equal to the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the VINT _ Ref selection circuit outputs an adjusted voltage target value VINT _ Ref = Vref'; wherein: the Vref '= Vref, or Vref' = Vret + VINT _ Offset; the VINT _ Offset is an Offset voltage;
when the voltage value of the target voltage Vref is less than the maximum voltage value of the target voltages Vref _ n of all Type-C ports, the regulated voltage target value VINT _ Ref = Vref _ Max output by the VINT _ Ref selection circuit; wherein: vref _ Max is a preset voltage, the voltage value of the Vref _ Max is larger than or equal to the maximum voltage output by all Type-C ports under all normal working conditions, the VINT feedback compensation circuit is always in a saturated state, the output OPTO current of the VINT feedback compensation circuit is equal to zero, and the normal regulation of the direct-current voltage VINT cannot be influenced.
4. The charging method suitable for the multiple USB Type-C according to claim 3, wherein: in step S50, the voltage value of the adjustment voltage target value VINT _ Ref is equal to or greater than the target voltage value Vref of the Type-C port.
5. The charging method suitable for the multiple USB Type-C according to claim 3, wherein: in step S30, the controlling, by the VBUS feedback compensation circuit, that the voltage value of the output voltage VBUS is consistent with the voltage value of the target voltage Vref specifically includes:
and comparing the difference between the voltage value of the target voltage Vref of the Type-C port and the voltage value of the output voltage VBUS, and adjusting the magnitude of the output value PWM through a differential amplification circuit to adjust the voltage value of the output voltage VBUS so that the voltage value of the output voltage VBUS is equal to the voltage value of the target voltage Vref.
6. The charging method suitable for the multiple USB Type-C according to claim 3, wherein: in step S10, the power module outputs a dc voltage Vint, which specifically includes:
the input end of the rectifier bridge is connected with the alternating current power supply end, the output end of the rectifier bridge is connected with the input end of the voltage conversion circuit, and the control end of the voltage conversion circuit is connected with the output end of the VINT feedback control circuit.
7. The charging method suitable for the multiple USB Type-C according to claim 6, wherein: and an isolated power supply is arranged on the voltage conversion circuit.
8. The charging method suitable for the multiple USB Type-C according to claim 6, wherein: the voltage conversion circuit is at least one of a flyback circuit, a forward circuit and a booster circuit plus LLC circuit.
CN202011425422.5A 2020-12-08 2020-12-08 Charging system and charging method suitable for multi-path USB Type-C Active CN112531844B (en)

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