CN105656162A - Rapid charging system and method based on USB PD protocol - Google Patents
Rapid charging system and method based on USB PD protocol Download PDFInfo
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- CN105656162A CN105656162A CN201610154772.XA CN201610154772A CN105656162A CN 105656162 A CN105656162 A CN 105656162A CN 201610154772 A CN201610154772 A CN 201610154772A CN 105656162 A CN105656162 A CN 105656162A
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- 238000007600 charging Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 36
- 108700025151 PD protocol Proteins 0.000 title abstract 5
- 238000012545 processing Methods 0.000 claims abstract description 20
- 238000010277 constant-current charging Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 12
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- 230000009466 transformation Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000005121 nitriding Methods 0.000 description 1
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- 238000005728 strengthening Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
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- H02J7/022—
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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
- H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
Abstract
The invention discloses a rapid charging system and method based on a USB PD protocol. The system comprises an adapter and a power utilization device; the adapter comprises a first input port, a first output port and a voltage transformation rectification filter voltage stabilizing circuit, and the voltage transformation rectification filter voltage stabilizing circuit comprises a first data processing chip which is based on the USB PD protocol and in data communication with the power utilization device; the power utilization device comprises a second input port connected with the first output port, a rechargeable battery and a charging control circuit, and the charging control circuit comprises a second data processing chip which is based on the USB PD protocol and in data communication with the adapter, a BUCK voltage conversion circuit and a constant current charging circuit; both the first output port and the second input port are Type C standard USB ports or Micro USB ports. According to the rapid charging system and method, the power utilization device directly adjusts the magnitude of the output voltage of the adapter through the USB PD protocol to make the adapter enter a constant current output work mode of the designated parameter, charging efficiency is high, and the power loss and heating in the power utilization device are lowered.
Description
Technical field
The present invention relates to consumption electronic products charging technique field, refer in particular to the quick charging system based on USBPD agreement and method.
Background technology
The consumption electronic products majorities such as mobile phone, MP3, MP4, flat board all adopt MicroUSB port to realize charging, but it is limited to traditional USB charging specifications, fill output power relatively small, it is no matter the 4.5W of 2.5W, USB3.0 of USB2.0, or the 7.5W of USBBC1.2, although the charge requirement of the power device that the battery capacity that can meet such as mobile phone, MP3 is relatively small, but still need to expend a lot of time and battery could be full of.
And along with the consumption electronic products such as mobile phone, panel computer function from strength to strength, power consumption also day by day increases, and battery capacity promotes limited, causes that charge frequency is more and more higher, for this, the quick charge how realizing electronic product has become as the direction of all big enterprises' emphasis research and development. At present, comparatively ripe rapid nitriding includes the QC(QuickCharge that Qualcomm proposes) the MaxCharge standard etc. that proposes of standard and TI company. But, these technical standards, all to improve charging voltage for basic means, also exist that the power attenuation that voltage transformation brings is big, caloric value is big in electricity consumption product charging process and the problem such as poor universality.
For mobile phone, the problem that traditional mobile phone quick charge runs into mainly has: the first, the electrochemical properties of battery self does not allow. At present, the average cell capacity of main flow mobile phone is at about 2.5AH, and according to the design of lithium ion battery with high energy density, charging current, less than 2.5A, puts before this, and the fully charged time theory ultimate value of mobile phone is 1 hour, actual in 1.5 hours. The second, the interface of charge circuit and line impedance problems. 3rd, the heat dissipation problem of interior of mobile phone. Traditional interior of mobile phone charging control circuit, is that external power source is carried out blood pressure lowering by BUCK voltage conversion circuit, is then charged to battery of mobile phone.Due to the inductance in BUCK voltage conversion circuit and switch MOS all can consumed energy, and then inside the small space of mobile phone, bring higher temperature rise.
The problem of above first relates to battery material and the development of technique itself, is in progress relatively slow, and makes many manufacturers more by improving charging control to improve charging rate. The QC standard that Qualcomm proposes, attempt to pass through booster tension, the method of reduction electric current breaks through MicroUSB interface and connecting line cannot carry big current problems, to obtain charging rate faster, in this respect, really achieve certain effect, and obtain the support of main flow Android mobile phone, but, QC technical standard yet suffers from the heat dissipation problem of interior of mobile phone DC-DC change-over circuit.
In addition, USB-IF(USBImplementersForum, USB application person forum) announce USBPowerDelivery(PD for the first time in July, 2012) 1.0 protocol specifications, set 5 kinds of power settings ranks (Profile1��5), reach as high as the electric power transmission quantity of 100 watts, and, feeder ear (Source) and power connection end (Sink) have can mutually to the power supply of reversible supply characteristic, such that it is able to allow various power device all can meet power demands by a USB cable, shorten the device charging interval and optimize the convenience of mobile applications. USBPD protocol specification can also be compatible with existing USB3.0/2.0, BC1.2/1.1/1.0 charging specifications. USBPD protocol specification has broad application prospects, but, to be but how current popularization USBPD protocol specification urgent problem by technical specification commercialization.
Summary of the invention
The technical problem to be solved in the present invention is in that, it is provided that a kind of quick charging system based on USBPD agreement, to improve the charge efficiency of power device, and reduces power attenuation and the power device caloric value when charging.
The present invention to solve the technical problem that further and be in that, it is provided that a kind of fast charge method based on USBPD agreement, to improve the charge efficiency of power device, and reduces power attenuation and the power device caloric value when charging.
For solving above-mentioned technical problem, the present invention provides following technical scheme: a kind of quick charging system based on USBPD agreement, is connected to the adapter power device to be charged by adapter including adapter with by USB cable;
Described adapter includes:
For the first input port being connected with electricity network;
For the first output port being connected with power device; And
It is connected to the Transformer Rectifier filter regulator circuit between first input port and the first output port, described Transformer Rectifier filter regulator circuit also include based on USBPD agreement and carry out data communication to power device and corresponding control the first data processing chip of Transformer Rectifier filter regulator circuit duty and be sequentially connected in series the voltage changing module between first input port and the first output port, rectification module, filtration module and Voltage stabilizing module, wherein, voltage changing module is also connected with the first data processing chip and adjusts output voltage values with the control instruction according to the first data processing chip,
Described power device includes:
For the second input port being connected with the first output port of adapter;
Rechargeable battery; And
It is connected to the charging control circuit between the second input port and rechargeable battery, described charging control circuit include based on USBPD agreement and carry out data communication to adapter with corresponding the second data processing chip of charging control circuit duty, BUCK voltage conversion circuit and the constant-current charging circuit of controlling, described second data processing chip is according to carrying out the result of data communication with the first data processing chip of adapter to determine current charge mode and the output voltage of the charging circuit also corresponding adjustment adapter of selected required corresponding employings;
Described first output port and the second input port are the USB port based on TypeC standard or MicroUSB port.
Further, described constant-current charging circuit is that low-impedance mistake is flowed and overvoltage protection switch.
Further, described power device is any one in following consumption electronic products: mobile phone, panel computer, MP4, MP3, portable power source, virtual reality headgear.
On the other hand, the present invention also provides for a kind of fast charge method based on USBPD agreement, comprises the following steps:
Step S1, sets up TYPE-C and connects: adapter is set up CC with power device by the USB cable of TYPE-C standard and is connected, and adapter acquiescence output 5V is to power device, and the traditional BUCK pattern of power device entrance carries out low current and charges at a slow speed;
Step S2, initial p D communicates configuration: set up after CC connects, adapter also sends Source_cap packet to power device, inform charging voltage and electric current that power device adapter supports, after power device receives Source_cap packet, replying a request packet comprising Mismatch flag bit, now, the charging control circuit of power device is still maintained at traditional BUCK charge mode;
Step S3, enter the fast mold filling formula of USBPD constant current: adapter is detecting after with the request packet of Mismatch, retransmit a Get_sink_cap packet to power device, the inquiry desired voltage and current of power device, after power device receives Get_sink_cap packet, the current voltage of the rechargeable battery according to power device and the requirement to charging current, reply a Sink_cap packet, after adapter receives the Sink_cap packet that power device sends over, readjust the Source_cap packet of oneself, discharge the voltage and current gear that power device is required in Sink_cap packet, after power device receives the Source_cap packet of correspondence, confirming that the other side supports the PD adapter filled soon, and ask oneself just now required voltage and current, adapter then exports the magnitude of voltage of correspondence and enters constant-current charging phase,
Step S4, constant-voltage charge: after the current voltage of rechargeable battery reaches specified peak, it is switched to constant-voltage charge pattern from constant current charging mode, BUCK voltage conversion circuit rechargeable battery is charged until being full of.
Further, in step S3, power device replies to the current voltage value that magnitude of voltage is rechargeable battery asked in the first Sink_cap packet of adapter.
Further, in step S3, after entering the fast mold filling formula of constant current, when power device detects charging current less than constant-current charge set point, send the request packet with Mismatch flag bit, adapter accepts this request packet, and Quick-return ps_ready packet, after response completes, adapter sends get_sink_cap packet, power device is then in sink_cap packet, place a magnitude of voltage than last high predetermined stepping difference, adapter is after receiving sink_cap packet, instruction according to power device adjusts the content of source_cap packet, and complete lifting and the output of voltage, thus it is gradually increased charging current to the constant-current charge current range set.
Further, the content of the request packet with Mismatch flag bit that power device sends is only different at Mismatch flag bit from the content of the last request packet, and other guide is completely the same.
Further, predetermined stepping difference is 50mV.
Further, in step S3, power device replies in the sink_cap packet of adapter, required voltage and current is variable power supply packet, and in this variable power supply packet, provide the operating current of constant-current charge, after adapter receives the request of this type, enter constant current mode, in follow-up constant-current charge process, adapter automatic regulating voltage is to maintain the constant current-supplying to power device.
Further, in step s3, rechargeable battery is also carried out impedance-compensated by power device, deducts the internal resistance of rechargeable battery and the product of charging current with the actual measurement magnitude of voltage of the rechargeable battery measured, using the difference that finally obtains as the current voltage value of rechargeable battery.
After adopting technique scheme, the present invention at least has the advantages that the present invention organizes the USBPD agreement published based on USB-IF, and in conjunction with the port of TYPE-C standard, in the power device constant-current charging of battery stage, the voltage of adapter output is not carried out DC/DC conversion by power device charge inside control circuit, but go the output voltage size adjusting adapter to allow it enter the constant current output mode of operation specifying parameter either directly through USBPD agreement, thus meeting the size of power device constant-current charge electric current. Thus when strengthening charging current, reducing the power attenuation within power device and heating, charging faster is allowed to be possibly realized.
Accompanying drawing explanation
Fig. 1 is the present invention theory diagram based on the quick charging system of USBPD agreement.
Fig. 2 is the present invention constant-current charge process schematic based on the fast charge method of USBPD agreement.
Fig. 3 is the present invention process schematic based on the USBPD initialization foundation of the fast charge method of USBPD agreement.
Fig. 4 is the present invention actively initiates, based on the power device of the fast charge method of USBPD agreement, the process schematic that voltage raises.
Fig. 5 is the present invention process schematic based on the power device specific adaptors entrance constant current mode of the fast charge method of USBPD agreement.
Detailed description of the invention
It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be combined with each other, and below in conjunction with the drawings and specific embodiments, the present invention are described in further detail.
As it is shown in figure 1, the present invention provides a kind of quick charging system based on USBPD agreement, including adapter 1 and the power device 2 that charged by adapter 1.
In the quick charging system based on USBPD agreement of the present invention, described adapter 1 is as feeder ear, and power device 2 is as power connection end, and both realize connecting by USB cable.
Described adapter 1 includes:
For the first input port 10 being connected with electricity network;
For the first output port 12 being connected with power device 2; And
It is connected to the Transformer Rectifier filter regulator circuit 14 between first input port 10 and the first output port 12, described Transformer Rectifier filter regulator circuit 14 also include based on USBPD agreement and carry out data communication to power device 2 and corresponding control the first data processing chip 140 of Transformer Rectifier filter regulator circuit 14 duty and be sequentially connected in series the voltage changing module 142 between first input port 10 and the first output port 12, rectification module 144, filtration module 146 and Voltage stabilizing module 148, wherein, voltage changing module 142 is also connected with the first data processing chip 140 and adjusts output voltage values with the control instruction according to the first data processing chip 140.
Described power device 2 can be the various consumption electronic products such as mobile phone, panel computer, MP4, MP3, portable power source, virtual reality headgear (VR headgear). Specifically, described power device 2 includes:
For the second input port 20 being connected with the first output port 12 of adapter 1;
Rechargeable battery 22; And
Be connected to the charging control circuit 24 between the second input port 20 and rechargeable battery 22, described charging control circuit 24 include based on USBPD agreement and carry out data communication to adapter 1 and control the second data processing chip 240 of charging control circuit 24 duty, BUCK voltage conversion circuit 242 and constant-current charging circuit 244 with corresponding. Wherein, BUCK voltage conversion circuit 242 can realize the constant-voltage charge to rechargeable battery 22 and trickle charge; and described constant-current charging circuit 244 can realize the constant-current charge to rechargeable battery 22; preferably, described constant-current charging circuit 244 has only to low-impedance stream and an overvoltage protection switch excessively. Described second data processing chip 240 carries out the result of data communication to determine current charge mode according to the first data processing chip 140 with adapter 1, thus the selected required corresponding charging circuit adopted.
Described first output port 12 and the second input port 20 be based on TypeC standard for the USB port docked with adapter or MicroUSB port. Owing to the port of TYPE-C standard allows maximum 5A electric current, and the battery of the small consumer electronic products such as current such as power device is typically all less than 1.5C when and charges, thus, the charging of tradition USB port exists interface and line impedance problems can be solved well.
The present invention is carried out communication based on the quick charging system of USBPD agreement by adapter 1 and power device 2, is determined the charge mode being currently needed for adopting, it may be assumed that trickle and constant-voltage charge pattern, constant current charging mode. Under trickle and constant-voltage charge pattern, by the BUCK voltage conversion circuit 242 within power device 2, rechargeable battery 22 is charged; And under constant current charging mode, adapter 1 voltage inputted is not converted by power device 2, but pass through USBPD agreement and directly adjust the output voltage of adapter 1, thus the stable electric current toward rechargeable battery 22 charging. Especially again through impedance-compensated process, the time of constant-current charge can be extended to greatest extent, shorten the time of constant-voltage charge, such that it is able to farthest reduce the problem that power attenuation is big, caloric value is big that BUCK voltage conversion circuit 242 work brings, provide possibility for promoting charging rate further.
Shown in Fig. 2 ~ Fig. 5, the present invention also provides for a kind of fast charge method based on USBPD agreement, comprises the following steps:
Step S1, sets up TYPE-C and connects. Adapter 1 is set up CC with power device 2 by the USB cable of TYPE-C standard and is connected, and adapter 1 acquiescence output 5V is to power device 2, and power device 2 enters traditional BUCK pattern to carry out low current and charge at a slow speed;
Step S2, initial p D communicate configuration. After setting up CC connection, adapter 1 also sends Source_cap packet to power device 2, inform charging voltage and electric current that power device 2 adapter 1 supports, for instance 5V/5A, 9V3A, 12V2A, after power device 2 receives Source_cap packet, reply a request packet comprising Mismatch flag bit, now, the charging control circuit 24 of power device 2 is still maintained at traditional BUCK charge mode, and charging current is typically maintained in below 2A;
Step S3, enters the fast mold filling formula of USBPD constant current. Adapter 1 is detecting after with the request packet of Mismatch, retransmit a Get_sink_cap packet to power device 2, the inquiry desired voltage and current of power device 2, after power device 2 receives Get_sink_cap packet, the voltage of the rechargeable battery 22 according to current power device 2 and the requirement to charging current, reply a Sink_cap packet, preferably, the current voltage value that magnitude of voltage is rechargeable battery 22 of request in first Sink_cap packet, so, the charging current switched after coming should be close to 0. After adapter 1 receives the Sink_cap packet that power device 2 sends over, readjust the Source_cap packet of oneself, discharge the voltage and current gear that power device 2 is required in Sink_cap packet. After power device 2 receives the Source_cap packet of correspondence, confirm that the other side supports the PD adapter filled soon, and ask oneself just now required voltage and current. Adapter 1 then exports the magnitude of voltage of correspondence. Subsequently, according to the size of current scope that constant-current charge strategy sets, power device 2 rising or the reduction of voltage are asked to adapter 1, it is preferable that minimum step value is 50mV. Perform step (for motor current) as follows: when power device 2 detects charging current less than constant-current charge set point, send the request packet with Mismatch flag bit, preferably, the content of this request packet is only different at Mismatch flag bit from the content of the last request packet, and other guide is completely the same. Adapter 1 can accept this request packet Quick-return ps_ready packet with accept, because the content of request is not changed in, so not needing to do power supply switching, ps_ready packet can go back with regard to response within 20ms. After response completes, adapter 1 sends get_sink_cap packet, and power device 2, then in sink_cap packet, places the magnitude of voltage of a last high 50mv of ratio. Adapter 1, after receiving sink_cap packet, adjusts the content of source_cap packet, and completes lifting and the output of voltage according to the instruction of power device 2. Thus increasing charging current length by length to the constant-current charge current range set.
Constant-current charge process determines the charging rate of power device, therefore, in constant-current charge process, power device 2 is internal to carry out impedance-compensated to battery, namely, the internal resistance of rechargeable battery 22 and the product of charging current is deducted, using the difference that finally obtains as the current voltage value of rechargeable battery 22 with the actual measurement magnitude of voltage of the rechargeable battery 22 measured. By impedance-compensated, it is possible to the time extending constant-current charge of maximum possible, shorten the time of constant-voltage charge.
Step S4, constant-voltage charge. After cell voltage after compensation reaches specified peak, being just switched to constant-voltage charge from constant-current charge, BUCK voltage conversion circuit 242 rechargeable battery 22 is charged, normally, the maximum current of constant-voltage charge is not more than 2A.
In yet another embodiment of the present invention, step S3 has been adjusted, specifically reply in the sink_cap packet of adapter at power device, required voltage and current is variable power supply packet (VariableSupplyPDO), and in this variable power supply packet, provide the operating current of constant-current charge, after adapter receives the request of this type, enter constant current mode, in follow-up constant-current charge process, adapter automatic regulating voltage is to maintain the constant current-supplying to power device.
Power device 2 specifies constant current operation electric current and voltage change range by the ceiling voltage (MaximumVoltage) in the variable power supply packet in SinkCap packet, minimum voltage (MinimumVoltage) and operating current (OperationalCurrent).After adapter 1 receives packet, enter constant current mode, provide constant charging current for power device 2. Thus simplifying the Charge Management loop of power device 2.
Much degree can complete the charging of battery at constant current mode, be weigh the important indicator whether fast charge method is outstanding. Compared with traditional non-fast mold filling formula, the present invention can provide bigger electric current, compared with filling soon with QC, owing to constant current process does not use BUCK voltage conversion circuit, it is possible to reduces the heat radiation pressure of loss and power device.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, being appreciated that and these embodiments can be carried out multiple change, amendment, replacement and modification without departing from the principles and spirit of the present invention, the scope of the invention and equivalency range limits.
Claims (10)
1., based on a quick charging system for USBPD agreement, it is connected to the adapter power device to be charged by adapter including adapter with by USB cable; It is characterized in that,
Described adapter includes:
For the first input port being connected with electricity network;
For the first output port being connected with power device; And
It is connected to the Transformer Rectifier filter regulator circuit between first input port and the first output port, described Transformer Rectifier filter regulator circuit also include based on USBPD agreement and carry out data communication to power device and corresponding control the first data processing chip of Transformer Rectifier filter regulator circuit duty and be sequentially connected in series the voltage changing module between first input port and the first output port, rectification module, filtration module and Voltage stabilizing module, wherein, voltage changing module is also connected with the first data processing chip and adjusts output voltage values with the control instruction according to the first data processing chip,
Described power device includes:
For the second input port being connected with the first output port of adapter;
Rechargeable battery; And
It is connected to the charging control circuit between the second input port and rechargeable battery, described charging control circuit include based on USBPD agreement and carry out data communication to adapter with corresponding the second data processing chip of charging control circuit duty, BUCK voltage conversion circuit and the constant-current charging circuit of controlling, described second data processing chip is according to carrying out the result of data communication with the first data processing chip of adapter to determine current charge mode and the output voltage of the charging circuit also corresponding adjustment adapter of selected required corresponding employings;
Described first output port and the second input port are the USB port based on TypeC standard or MicroUSB port.
2. the quick charging system based on USBPD agreement as claimed in claim 1, it is characterised in that described constant-current charging circuit is that low-impedance mistake is flowed and overvoltage protection switch.
3. the quick charging system based on USBPD agreement as claimed in claim 1, it is characterised in that described power device is any one in following consumption electronic products: mobile phone, panel computer, MP4, MP3, portable power source, virtual reality headgear.
4. the fast charge method based on USBPD agreement, it is characterised in that comprise the following steps:
Step S1, sets up TYPE-C and connects: adapter is set up CC with power device by the USB cable of TYPE-C standard and is connected, and adapter acquiescence output 5V is to power device, and the traditional BUCK pattern of power device entrance carries out low current and charges at a slow speed;
Step S2, initial p D communicates configuration: set up after CC connects, adapter also sends Source_cap packet to power device, inform charging voltage and electric current that power device adapter supports, after power device receives Source_cap packet, replying a request packet comprising Mismatch flag bit, now, the charging control circuit of power device is still maintained at traditional BUCK charge mode;
Step S3, enter the fast mold filling formula of USBPD constant current: adapter is detecting after with the request packet of Mismatch, retransmit a Get_sink_cap packet to power device, the inquiry desired voltage and current of power device, after power device receives Get_sink_cap packet, the current voltage of the rechargeable battery according to power device and the requirement to charging current, reply a Sink_cap packet, after adapter receives the Sink_cap packet that power device sends over, readjust the Source_cap packet of oneself, discharge the voltage and current gear that power device is required in Sink_cap packet, after power device receives the Source_cap packet of correspondence, confirming that the other side supports the PD adapter filled soon, and ask oneself just now required voltage and current, adapter then exports the magnitude of voltage of correspondence and enters constant-current charging phase,
Step S4, constant-voltage charge: after the current voltage of rechargeable battery reaches specified peak, it is switched to constant-voltage charge pattern from constant current charging mode, BUCK voltage conversion circuit rechargeable battery is charged until being full of.
5. the fast charge method based on USBPD agreement as claimed in claim 4, it is characterised in that in step S3, power device replies to the current voltage value that magnitude of voltage is rechargeable battery asked in the first Sink_cap packet of adapter.
6. the fast charge method based on USBPD agreement as claimed in claim 4, it is characterized in that, in step S3, after entering the fast mold filling formula of constant current, when power device detects charging current less than constant-current charge set point, send the request packet with Mismatch flag bit, adapter accepts this request packet, and Quick-return ps_ready packet, after response completes, adapter sends get_sink_cap packet, power device is then in sink_cap packet, place a magnitude of voltage than last high predetermined stepping difference, adapter is after receiving sink_cap packet, instruction according to power device adjusts the content of source_cap packet, and complete lifting and the output of voltage, thus it is gradually increased charging current to the constant-current charge current range set.
7. the fast charge method based on USBPD agreement as claimed in claim 6, it is characterized in that, the content of the request packet with Mismatch flag bit that power device sends is only different at Mismatch flag bit from the content of the last request packet, and other guide is completely the same.
8. the fast charge method based on USBPD agreement as claimed in claim 6, it is characterised in that predetermined stepping difference is 50mV.
9. the fast charge method based on USBPD agreement as claimed in claim 4, it is characterized in that, in step S3, power device replies in the sink_cap packet of adapter, and required voltage and current is variable power supply packet, and provides the operating current of constant-current charge in this variable power supply packet, after adapter receives the request of this type, entering constant current mode, in follow-up constant-current charge process, adapter automatic regulating voltage is to maintain the constant current-supplying to power device.
10. the fast charge method based on USBPD agreement as claimed in claim 4, it is characterized in that, in step s3, rechargeable battery is also carried out impedance-compensated by power device, the internal resistance of rechargeable battery and the product of charging current is deducted, using the difference that finally obtains as the current voltage value of rechargeable battery with the actual measurement magnitude of voltage of the rechargeable battery measured.
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Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105977563A (en) * | 2016-06-28 | 2016-09-28 | 努比亚技术有限公司 | Charging method, charging equipment and terminal |
| CN106130114A (en) * | 2016-07-22 | 2016-11-16 | 圣邦微电子（北京）股份有限公司 | The lithium ion chargeable battery charging control circuit of complex optimum |
| CN106537719A (en) * | 2016-08-15 | 2017-03-22 | 北京小米移动软件有限公司 | Electronic device, charger, charging system, and charging method |
| CN106571667A (en) * | 2016-10-27 | 2017-04-19 | 芯海科技（深圳）股份有限公司 | Adapter based on USB-PD and quick charging method |
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