CN112421790B - Derating control method and device for wireless charging system and wireless charging system - Google Patents
Derating control method and device for wireless charging system and wireless charging system Download PDFInfo
- Publication number
- CN112421790B CN112421790B CN202110082874.6A CN202110082874A CN112421790B CN 112421790 B CN112421790 B CN 112421790B CN 202110082874 A CN202110082874 A CN 202110082874A CN 112421790 B CN112421790 B CN 112421790B
- Authority
- CN
- China
- Prior art keywords
- module
- current
- input voltage
- voltage
- wireless charging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000010363 phase shift Effects 0.000 claims abstract description 44
- 230000033228 biological regulation Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 15
- 238000004891 communication Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 229910044991 metal oxide Inorganic materials 0.000 description 5
- 150000004706 metal oxides Chemical class 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 5
- 238000011217 control strategy Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000009351 contact transmission Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
-
- 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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention is suitable for the technical field of wireless charging systems, and provides a derating control method and device of a wireless charging system and the wireless charging system, wherein the method comprises the following steps: collecting a first inversion current of a high-frequency inversion module at a transmitting end of a wireless charging system and a first input voltage of a Buck module at a receiving end; judging whether the first inversion current is larger than a preset first current threshold or whether the first input voltage is larger than a preset first voltage threshold; and when the first inverter current is larger than a first current threshold value or the first input voltage is larger than a first voltage threshold value, controlling the phase shift angle of the high-frequency inverter module to increase until the first inverter current is smaller than the first current threshold value and the first input voltage is in a preset module opening voltage range. Even if the distance between the transmitting coil and the receiving coil is too close, the inverter current can be smaller than the first current threshold value, the input voltage of the Buck module is in the module opening voltage range, the loss of the MOS tube is reduced, and the system can be charged normally.
Description
Technical Field
The invention belongs to the technical field of wireless charging, and particularly relates to a derating control method and device for a wireless charging system and the wireless charging system.
Background
The wireless charging system is characterized in that a wireless transmitting coil and a wireless receiving coil transfer energy through a magnetic field to realize non-contact transmission of electric energy. Because wireless charging system's functional good, the reliability is high, the flexibility is good, security and life are higher, in addition contactless, the characteristics of no wearing and tearing, its wide application is in each field.
The wireless charging module includes a transmitting end and a receiving end, as shown in fig. 1. A buck module is often added at a receiving end, and the buck module enables charging voltage/current to tend to be stable through detecting output voltage/current of the buck module and closed-loop regulation, and effective and timely protection is achieved. When the wireless charging system adopts an LCC-S topology, the MOS tube current of the high-frequency inversion module at the transmitting end is in a negative correlation with the transmitting coil current, namely when the transmitting coil current is reduced, the MOS tube current of the high-frequency inversion module is increased.
At the in-process of charging current crescent, when transmitting coil and receiving coil distance when too near, the coupling coefficient between transmitting coil and the receiving coil is great for the transmitting coil current is less, thereby leads to the MOS pipe current of high frequency contravariant module great, and at this moment, the loss of MOS pipe can increase, leads to wireless charging system efficiency to descend, and the MOS pipe generates heat and seriously leads to the MOS pipe to damage even.
Disclosure of Invention
The embodiment of the invention provides a derating control method for a wireless charging system, and aims to solve the problems that the distance between a transmitting coil and a receiving coil of the wireless charging system is too close, the MOS (metal oxide semiconductor) tube loss is increased due to the fact that the current of an MOS tube of a high-frequency inverter module is large, the efficiency of the wireless charging system is reduced, and even the MOS tube is damaged.
The embodiment of the invention is realized in such a way that a derating control method of a wireless charging system comprises the following steps:
collecting a first inversion current of a high-frequency inversion module at a transmitting end of a wireless charging system and a first input voltage of a Buck module at a receiving end;
judging whether the first inversion current is larger than a preset first current threshold or whether the first input voltage is larger than a preset first voltage threshold;
and when the first inverter current is larger than a first current threshold value or the first input voltage is larger than a first voltage threshold value, controlling the phase shift angle of the high-frequency inverter module to increase until the first inverter current is smaller than the first current threshold value and the first input voltage is in a preset module opening voltage range.
In a second aspect, the present application further provides a derating control device for a wireless charging system, the device including:
the information acquisition unit is used for acquiring a first inversion current of a high-frequency inversion module at a transmitting end of the wireless charging system and a first input voltage of a Buck module at a receiving end;
the information judgment first unit is used for judging whether the first inversion current is greater than a preset first current threshold or whether the first input voltage is greater than a preset first voltage threshold;
the module controls the first unit to control the phase shift angle of the high-frequency inversion module to increase when the first inversion current is greater than the first current threshold or the first input voltage is greater than the first voltage threshold until the first inversion current is less than the first current threshold and the first input voltage is within a preset module turn-on voltage range.
In a third aspect, the present application further provides a wireless charging system, where the wireless charging system includes the derating control device of the wireless charging system.
According to the embodiment of the application, the first inverter current of the high-frequency inverter module and the first input voltage of the Buck module are collected in the charging process, when the first inverter current is larger than the first current threshold value, or when the first input voltage is larger than the first voltage threshold value, the phase shift angle of the high-frequency inverter module is controlled to increase, so that the increase of the inverter current of the high-frequency inverter module is inhibited, the phase shift angle can be kept stable and unchanged when the first inverter current is smaller than the first current threshold value and the first input voltage is smaller than the first voltage threshold value, even if the distance between the transmitting coil and the receiving coil is too close, the inverter current can be smaller than the first current threshold value, the input voltage of the Buck module is in the module opening voltage range, the Buck module can be normally charged while being connected with the wireless charging system, the current of an MOS (metal oxide semiconductor) tube in the high-frequency inverter module is.
Drawings
Fig. 1 is a schematic system structure diagram of a wireless charging system provided in the prior art;
fig. 2 is a schematic flow chart illustrating an embodiment of a derating control method for a wireless charging system according to the present application;
fig. 3 is a schematic diagram of a basic flow after a high-frequency inverter module is turned on according to an embodiment of the derating control method of the wireless charging system of the present application;
fig. 4 is a schematic basic flow chart of adjusting the output current of the Buck module according to an embodiment of the derating control method of the wireless charging system of the present application;
fig. 5 is a schematic basic flowchart illustrating a method for derating a wireless charging system according to an embodiment of the present disclosure;
fig. 6 is a schematic block diagram illustrating an embodiment of a derating control device of a wireless charging system according to the present application;
fig. 7 is a schematic block diagram of another embodiment of a derating control device of a wireless charging system according to the present application;
fig. 8 is a schematic block diagram illustrating a derating control device of a wireless charging system according to another embodiment of the present disclosure;
fig. 9 is a schematic block diagram of a derating control device of a wireless charging system according to another embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The existing wireless charging system is in the process that the charging current is gradually increased, when the distance between the transmitting coil and the receiving coil is too close, the MOS tube of the high-frequency inverter module has larger current, so that the loss of the MOS tube is increased, the efficiency of the wireless charging system is reduced, and even the MOS tube is heated to seriously damage the MOS tube. The application can restrain the increase of the inverter current of the high-frequency inverter module, limit the current of the MOS tube in the high-frequency inverter module, and enable the wireless charging system to be charged normally when the loss of the MOS tube is reduced.
Example one
In some optional embodiments, please refer to fig. 2, and fig. 2 is a flowchart illustrating an embodiment of a derating control method of a wireless charging system according to the present application.
As shown in fig. 2, a first aspect of the present application provides a derating control method for a wireless charging system, the method including the following steps:
s1100, collecting a first inversion current of a high-frequency inversion module at a transmitting end of a wireless charging system and a first input voltage of a Buck module at a receiving end;
the structure diagram of the wireless charging system is shown in fig. 1, the wireless charging system comprises a transmitting end and a receiving end, wherein the transmitting end comprises a rectifying module, a high-frequency inversion module and a transmitting coil, the receiving end comprises a receiving coil, a rectifying module and a Buck module, the rectifying module of the transmitting end is connected with mains supply, the Buck module is connected with a load (a battery), the transmitting end and the receiving end communicate with each other through a wireless communication module, wherein the transmitting end comprises a transmitting end control module and a transmitting end wireless communication module, the receiving end comprises a receiving end control module and a receiving end wireless communication module, the transmitting end wireless communication module and the receiving end wireless communication module transmit wireless communication signals through wireless communication signals, the control module of the transmitting end is connected with the high-frequency inversion module to control the working state of the high-frequency inversion module, for example, the frequency conversion or phase shift angle of, and a control module at the receiving end is connected with the Buck module so as to monitor and control the input voltage of the Buck module or control and adjust the charging current output by the Buck module.
The wireless charging system can be provided with a processor, and the steps of the derating control method of the wireless charging system provided by the application are implemented by the processor. The processor may be an actual processor disposed on the wireless charging system, or may be a virtual processor in the cloud, or the control module of the transmitting end is designed as the processor, which is not limited herein.
The processor can be connected with the high-frequency inversion module of the transmitting end, the processor can also be connected with the Buck module of the receiving end, the first inversion current of the high-frequency inversion module and the first input voltage of the Buck module can be collected in real time, the first inversion current is the inversion current of the high-frequency inversion module, the first input voltage is the input voltage of the Buck module, in some embodiments, the processor can also be connected with the control module of the transmitting end, the inversion current of the high-frequency inversion module can be obtained through the control module of the transmitting end, and the processor can also be connected with the control module of the receiving end, so that the input voltage of the Buck module can be obtained through the control module of the receiving end.
After the high-frequency inversion module at the transmitting end is switched on, the phase shift angle of the high-frequency inversion module is gradually reduced from the maximum value, and the inversion current at the transmitting end and the input voltage of the Buck module at the receiving end are also gradually increased. When the input voltage of the Buck module is larger than the module opening voltage Vopen, the Buck module can gradually increase the output current, and in the process that the output current of the Buck module is gradually increased, the processor collects the inversion current of the high-frequency inversion module and the input voltage of the Buck module.
S1200, judging whether the first inverter current is larger than a preset first current threshold or whether the first input voltage is larger than a preset first voltage threshold;
the first current threshold and the first voltage threshold may be set in the processor, where the first current threshold is I1, the first voltage threshold is V1, the processor compares the first inverter current with the first current threshold I1, and compares the first input voltage with the first voltage threshold V1, and when the first inverter current is greater than the first current threshold I1 or when the first input voltage is greater than the first voltage threshold V1, step S1300 is executed, otherwise step S1100 is executed.
And S1300, controlling the phase shift angle of the high-frequency inversion module to increase until the first inversion current is smaller than the first current threshold and the first input voltage is within a preset module opening voltage range.
The module turn-on voltage range may be set in the processor, and in some embodiments, the module turn-on voltage range includes a module turn-on voltage Vopen to a first voltage threshold V1, where Vopen is a turn-on point of the Buck module, and Vopen < V1, and in implementation, the Buck module further includes an input under-voltage protection point Vclose, where Vclose < Vopen < V1. When the inverter current of the high-frequency inverter module is greater than a first current threshold value I1, the phase shift angle of the high-frequency inverter module is controlled to be increased, the inverter current is reduced, the input voltage of the Buck module is reduced until the inverter current is less than the first current threshold value I1, the first current threshold value I1 can be selected according to the normal working range of an MOS (metal oxide semiconductor) tube and a wireless charging system, the loss of the MOS tube of the high-frequency inverter module can be effectively restrained and reduced, meanwhile, the input voltage of the Buck module is between Vopen and V1, the input voltage of the Buck module is not lower than an input under-voltage protection point Vclose, the Buck module can be kept continuously conducted, and the wireless charging system can be normally charged.
According to the embodiment of the application, the first inverter current of the high-frequency inverter module and the first input voltage of the Buck module are collected in the charging process, when the first inverter current is larger than the first current threshold value, or when the first input voltage is larger than the first voltage threshold value, the phase shift angle of the high-frequency inverter module is controlled to increase, so that the increase of the inverter current of the high-frequency inverter module is inhibited, the phase shift angle can be kept stable and unchanged when the first inverter current is smaller than the first current threshold value and the first input voltage is smaller than the first voltage threshold value, even if the distance between the transmitting coil and the receiving coil is too close, the inverter current can be smaller than the first current threshold value, the input voltage of the Buck module is in the module opening voltage range, the Buck module can be normally charged while being connected with the wireless charging system, the current of an MOS (metal oxide semiconductor) tube in the high-frequency inverter module is.
Example two
In some optional embodiments, please refer to fig. 3, and fig. 3 is a schematic flow chart of the high-frequency inverter module according to an embodiment of the present application after being turned on.
As shown in fig. 3, before the step of collecting the first inverter current of the high-frequency inverter module at the transmitting end of the wireless charging system and the first input voltage of the Buck module at the receiving end, the derating control method of the wireless charging system provided by the present application further includes:
s1010, detecting a second inverter current of the high-frequency inverter module and a second input voltage of the Buck module after the high-frequency inverter module is switched on;
s1020, determining whether the second inverter current is smaller than a preset second current threshold and the second input voltage is smaller than a preset second voltage threshold;
the second inversion current is the inversion current of the high-frequency inversion module, the second input voltage is the input voltage of the Buck module, after the high-frequency inversion module at the transmitting end just started after charging is switched on, detecting a second inversion current of the high-frequency inversion module and a second input voltage of the Buck module, and comparing the second inverter current to a second current threshold, and comparing the second input voltage to a second voltage threshold, which may be set in the processor, wherein in some embodiments, the second current threshold is I2, the second voltage threshold is V2, the I2 is less than I1, and I1 and I2 can be selected according to the required coil distance range, the normal working current range of the MOS tube of the high-frequency inverter module and the normal working range of the input voltage of the Buck module, so that the loss of the MOS tube is not too large, and the wireless charging system can be charged normally. The second voltage threshold is smaller than the first voltage threshold, when the voltage is applied, Vclose is less than Vopen and less than V2 and less than V1, and Vclose, Vopen, V2 and V1 can be selected according to the withstand voltage of the MOS tube and the normal working range of Buck module input.
The processor compares the second inverter current with a second current threshold I2 and compares the second input voltage with a second voltage threshold V2, performs step S1030 when the second inverter current is less than the second current threshold I2 and the second input voltage is less than the second voltage threshold V2, and performs step S1100 when the second inverter current is greater than the second current threshold I2 or when the second input voltage is greater than the second voltage threshold V2.
And S1030, controlling the phase shifting angle of the high-frequency inversion module to gradually decrease from the maximum value so as to increase the second inversion current and the second input voltage.
After the high-frequency inversion module at the transmitting end is turned on, when the processor detects that the inversion current at the transmitting end is less than I2 and the Buck input voltage at the receiving end is less than V2, the phase shift angle is gradually reduced from the maximum value, the inversion current at the transmitting end and the input voltage of the Buck module are also gradually increased, when the input voltage of the Buck module is greater than the module turn-on voltage Vopen, the Buck module gradually increases the output current, in the process that the output current of the Buck module gradually increases, if the inversion current at the transmitting end is still less than I2 and the Buck input voltage is still less than V2, the phase shift angle is continuously controlled to be reduced, and in the process that the output current of the Buck module gradually increases, the step S1100 is executed.
In other embodiments, in the process of gradually increasing the output current of the Buck module, if the inverting current at the transmitting terminal is detected to be greater than I1 or the Buck input voltage is detected to be greater than V1, the phase shift angle of the high-frequency inverting module is controlled to be increased, so that the inverting current at the transmitting terminal and the input voltage of the Buck module are inhibited from increasing. When the coil distance is far away, the phase shift angle keeps stable and unchanged when the inverter current at the transmitting end is less than I1 and the input voltage of the Buck module is between V2 and V1, and the Buck module can output at full rate; when the coil distance is too close, the phase shift angle keeps stable and unchanged when the inverter current at the transmitting end is between I2-I1 and the input voltage of the Buck module is smaller than V2, the input voltage of the Buck module is between Vopen-V2 at the moment, and the input voltage of the Buck module when loaded is not lower than an input undervoltage protection point Vclose, so that the rated output can be reduced, the inverter current is smaller than I1, and the system can be normally charged while the MOS tube loss is ensured not to be too large.
EXAMPLE III
In some optional embodiments, please refer to fig. 4, fig. 4 is a schematic flowchart illustrating a specific process of adjusting an output current of a Buck module according to an embodiment of the derating control method of the wireless charging system provided in the present application.
As shown in fig. 4, when the first inverter current is greater than the first current threshold or the first input voltage is greater than the first voltage threshold, the phase shift angle of the high-frequency inverter module is controlled to increase until the first inverter current is less than the first current threshold and the first input voltage is within the preset module turn-on voltage range, and then the derating control method of the wireless charging system further includes the following steps:
s1400, acquiring real-time input voltage of the Buck module;
s1500, adjusting the output current of the Buck module according to a preset current adjusting strategy and the real-time input voltage.
When the distance between the transmitting coil and the receiving coil of the wireless charging system is too close, the input voltage of the Buck module is smaller than V2, the output current of the Buck module can be properly adjusted according to the magnitude of the input voltage, when the distance between the transmitting coil and the receiving coil of the wireless charging system is smaller than a preset distance threshold value in implementation, the distance between the transmitting coil and the receiving coil of the wireless charging system is considered to be too close, and the distance threshold value can be selected according to the normal working range of the MOS transistor and the normal working range of the system. In some embodiments, the adjusting the output current according to the magnitude of the input voltage comprises: the method comprises the steps of detecting real-time input voltage of a Buck module, wherein the real-time input voltage is input voltage of the Buck module when the Buck module is loaded, a current adjusting strategy can be arranged in a processor, and the processor adjusts the output current of the Buck module by utilizing the current adjusting strategy and the real-time input voltage, so that the input voltage of the Buck module when the Buck module is loaded is not lower than an input under-voltage protection point Vclose, and the derating output is realized while the wireless charging system can be normally charged.
Example four
In some optional embodiments, please refer to fig. 5, fig. 5 is a schematic flowchart illustrating a specific process of controlling a wireless charging system to stop charging according to an embodiment of a derating control method of the wireless charging system provided in the present application.
As shown in fig. 5, after the step of reducing the output current of the Buck module according to the preset current regulation strategy and the real-time input voltage, the derating control method of the wireless charging system further includes:
s1600, detecting the electric quantity information of the rechargeable battery;
s1700, judging whether the electric quantity of the rechargeable battery is full according to the electric quantity information;
the output of Buck module is connected with rechargeable battery in order to charge rechargeable battery, when implementing, rechargeable battery includes battery management module, thereby Buck module is connected with battery management module and obtains rechargeable battery's electric quantity information, the electric quantity information includes rechargeable battery's battery electric quantity, voltage, electric current etc. to the electric current example, the charging current who keeps the constant current when rechargeable battery normally charges, and reduce the electric current when fully charged and let the battery fully charge, when the electric current falls to certain current value (can specifically select according to the battery), confirm that the battery is fully charged. In other embodiments, the processor may determine whether the battery is fully charged based on information fed back from the battery management system that the battery is fully charged. When the battery is fully charged, step S1800 is executed to terminate charging, for example, by turning off the high-frequency inverter module at the transmitting end, to turn off the wireless charging system to terminate charging. If the battery is not fully charged, step S1600 is executed.
In some embodiments, the wireless charging system adopts an LCC-S topology, and the MOS transistor current of the high-frequency inverter module at the transmitting end is in a negative correlation with the transmitting coil current. In the derating control method of the wireless charging system, the transmitting end high-frequency inversion module of the LCC-S topology adopts a control strategy of phase shift angle variation, the smaller the phase shift angle is, the larger the inversion current is, the larger the input voltage of the Buck module is, and the inversion current threshold values I1 and I2 of phase shift angle variation can be designed. Wherein, I2< I1, I1 and I2 can be selected according to the required coil distance range, the normal working current range of the MOS tube of the transmitting end high-frequency inversion module and the normal working range of the input voltage of the Buck module at the receiving end.
After a high-frequency inversion module at a transmitting end is switched on, when the fact that the inversion current at the transmitting end is smaller than I2 and the Buck input voltage at a receiving end is smaller than V2 is detected, a phase shift angle is gradually reduced from the maximum value, the inversion current at the transmitting end and the input voltage of the Buck module at the receiving end are gradually increased, when the input voltage of the Buck module is larger than a module switching-on voltage Vopen, the Buck module gradually increases output current, and in the process that the output current of the Buck module gradually increases, if the inversion current at the transmitting end is still smaller than I2 and the Buck input voltage at the receiving end is still smaller than V2, the phase shift angle is continuously reduced.
In the process that the output current of the Buck module is gradually increased, if the fact that the inversion current of the transmitting end is larger than I1 or the Buck input voltage of the receiving end is larger than V1 is detected, the phase shift angle of the high-frequency inversion module is controlled to be increased, and therefore the inversion current of the transmitting end and the input voltage of the Buck module of the receiving end are restrained from increasing.
When the coil distance is far away, the phase shift angle can be kept stable and unchanged when the inversion current of the transmitting end is less than I1 and the input voltage of the Buck module of the receiving end is between V2 and V1, and the Buck module outputs in full; when the coil distance is too close, the phase shift angle keeps stable and unchanged when the inverter current at the transmitting end is between I2-I1 and the input voltage of the Buck module at the receiving end is less than V2, at the moment, the input voltage of the Buck module is less than V2, the output current is properly reduced according to the size of the input voltage, so that the input voltage of the Buck module when loaded is not lower than an input undervoltage protection point Vclose, the rated output can be reduced, the inverter current is less than I1, the MOS transistor loss is not too large, and the system can be normally charged.
EXAMPLE five
In some optional embodiments, an embodiment of the present application further provides a derating control device of a wireless charging system, please refer to fig. 6, where fig. 6 is a schematic block diagram illustrating a module structure of an embodiment of the derating control device of the wireless charging system.
As shown in fig. 6, the derating control device of the wireless charging system provided by the present application includes:
the information acquisition unit 110 is configured to acquire a first inverter current of a high-frequency inverter module at a transmitting end of the wireless charging system and a first input voltage of a Buck module at a receiving end;
an information determining first unit 120, configured to determine whether the first inverter current is greater than a preset first current threshold or whether the first input voltage is greater than a preset first voltage threshold;
the module control first unit 130 is configured to, when the first inverter current is greater than the first current threshold or the first input voltage is greater than the first voltage threshold, control a phase shift angle of the high-frequency inverter module to increase until the first inverter current is less than the first current threshold and the first input voltage is within a preset module turn-on voltage range.
According to the embodiment of the application, the first inverter current of the high-frequency inverter module and the first input voltage of the Buck module are collected in the charging process, when the first inverter current is larger than the first current threshold value, or when the first input voltage is larger than the first voltage threshold value, the phase shift angle of the high-frequency inverter module is controlled to increase, so that the increase of the inverter current of the high-frequency inverter module is inhibited, the phase shift angle can be kept stable and unchanged when the first inverter current is smaller than the first current threshold value and the first input voltage is smaller than the first voltage threshold value, even if the distance between the transmitting coil and the receiving coil is too close, the inverter current can be smaller than the first current threshold value, the input voltage of the Buck module is in the module opening voltage range, the Buck module can be normally charged while being connected with the wireless charging system, the current of an MOS (metal oxide semiconductor) tube in the high-frequency inverter module is.
In some optional embodiments, as shown in fig. 7, the wireless charging system derating control device provided by the present application further includes:
the information monitoring unit 101 is used for detecting a second inverter current of the high-frequency inverter module and a second input voltage of the Buck module after the high-frequency inverter module is switched on;
an information determination second unit 102, configured to determine whether the second inverter current is smaller than a preset second current threshold and the second input voltage is smaller than a preset second voltage threshold;
the module controls the second unit 103, configured to control the phase shift angle of the high-frequency inverter module to gradually decrease from a maximum value when it is determined that the second inverter current is smaller than the second current threshold and the second input voltage is smaller than the second voltage threshold, so that the second inverter current and the second input voltage are increased.
In some optional embodiments, as shown in fig. 8, the wireless charging system derating control device provided by the present application further includes:
the voltage acquisition unit 140 is used for acquiring the real-time input voltage of the Buck module;
and a current adjusting unit 150, configured to reduce the output current of the Buck module according to a preset current adjusting strategy and the real-time input voltage.
In some optional embodiments, as shown in fig. 9, the wireless charging system derating control device provided by the present application further includes:
the electric quantity detection unit 160 is used for detecting the electric quantity information of the rechargeable battery, wherein the rechargeable battery is connected with the output end of the Buck module;
an electric quantity judging unit 170 for judging whether the electric quantity of the rechargeable battery is full according to the electric quantity information;
and a charging control unit 180 for ending the charging when the charge amount of the rechargeable battery is fully charged.
In some optional embodiments, the module turn-on voltage range includes the module turn-on voltage to a first voltage threshold, the module turn-on voltage, the second voltage threshold, and the first voltage threshold are sequentially incremented, and the first current threshold is greater than the second current threshold.
The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments without reference to the device embodiments.
EXAMPLE six
In some optional embodiments, an embodiment of the present application further provides a wireless charging system, where the wireless charging system includes the wireless charging system derating control device as described above.
The wireless charging system comprises a transmitting end and a receiving end, wherein the transmitting end comprises a rectifying module, a high-frequency inversion module and a transmitting coil, the receiving end comprises a receiving coil, the rectifying module and a Buck module, the rectifying module is connected with a mains supply, the Buck module is connected with a load (a battery), communication is carried out between the transmitting end and the receiving end through a wireless communication module, wherein the transmitting end comprises a transmitting end control module and a transmitting end wireless communication module, the receiving end comprises a receiving end control module and a receiving end wireless communication module, data are transmitted between the transmitting end wireless communication module and the receiving end wireless communication module through wireless communication signals, the control module of the transmitting end is connected with the high-frequency inversion module, and the control module of the receiving end is connected with the Buck module.
The wireless charging system adopts LCC-S topology, and the MOS tube current of the high-frequency inversion module at the transmitting end is in negative correlation with the transmitting coil current. In the derating control method of the wireless charging system, the transmitting end high-frequency inversion module of the LCC-S topology adopts a control strategy of phase shift angle variation, the smaller the phase shift angle is, the larger the inversion current is, the larger the input voltage of the Buck module is, and the inversion current threshold values I1 and I2 of phase shift angle variation can be designed. Wherein, I2< I1, I1 and I2 can be selected according to the required coil distance range, the normal working current range of the MOS tube of the transmitting end high-frequency inversion module and the normal working range of the input voltage of the Buck module at the receiving end.
After a high-frequency inversion module at a transmitting end is switched on, when the fact that the inversion current at the transmitting end is smaller than I2 and the Buck input voltage at a receiving end is smaller than V2 is detected, a phase shift angle is gradually reduced from the maximum value, the inversion current at the transmitting end and the input voltage of the Buck module at the receiving end are gradually increased, when the input voltage of the Buck module is larger than a module switching-on voltage Vopen, the Buck module gradually increases output current, and in the process that the output current of the Buck module gradually increases, if the inversion current at the transmitting end is still smaller than I2 and the Buck input voltage at the receiving end is still smaller than V2, the phase shift angle is continuously reduced.
In the process that the output current of the Buck module is gradually increased, if the fact that the inversion current of the transmitting end is larger than I1 or the Buck input voltage of the receiving end is larger than V1 is detected, the phase shift angle of the high-frequency inversion module is controlled to be increased, and therefore the inversion current of the transmitting end and the input voltage of the Buck module of the receiving end are restrained from increasing.
When the coil distance is far away, the phase shift angle can be kept stable and unchanged when the inversion current of the transmitting end is less than I1 and the input voltage of the Buck module of the receiving end is between V2 and V1, and the Buck module outputs in full; when the coil distance is too close, the phase shift angle keeps stable and unchanged when the inverter current at the transmitting end is between I2-I1 and the input voltage of the Buck module at the receiving end is less than V2, at the moment, the input voltage of the Buck module is less than V2, the output current is properly reduced according to the size of the input voltage, so that the input voltage of the Buck module when loaded is not lower than an input undervoltage protection point Vclose, the rated output can be reduced, the inverter current is less than I1, the MOS transistor loss is not too large, and the system can be normally charged.
This application is through the first inverter current of gathering high frequency contravariant module and the first input voltage of Buck module in charging process, when first inverter current is greater than first current threshold, or when first input voltage is greater than first voltage threshold, the phase shift angle of control high frequency contravariant module increases, thereby restrain the increase of the inverter current of high frequency contravariant module, the phase shift angle can be when first inverter current is less than first current threshold and first input voltage is less than first voltage threshold and remain stable unchangeable, even when transmitting coil and receiving coil distance are too close, also can make inverter current be less than first current threshold, and the input voltage of Buck module is in the module and opens the voltage range, when making Buck module switch on wireless charging system can normally charge, the electric current of MOS pipe in the restriction high frequency contravariant module, reduce the loss of MOS pipe.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A derating control method for a wireless charging system, the method comprising the steps of:
collecting a first inversion current of a high-frequency inversion module at a transmitting end of a wireless charging system and a first input voltage of a Buck module at a receiving end;
judging whether the first inverter current is larger than a preset first current threshold or whether the first input voltage is larger than a preset first voltage threshold;
when the first inverter current is larger than the first current threshold or the first input voltage is larger than the first voltage threshold, controlling the phase shift angle of the high-frequency inverter module to increase until the first inverter current is smaller than the first current threshold and the first input voltage is within a preset module switching-on voltage range;
before the step of collecting the first inverter current of the high-frequency inverter module at the transmitting end of the wireless charging system and the first input voltage of the Buck module at the receiving end, the method further includes:
detecting a second inverter current of the high-frequency inverter module and a second input voltage of the Buck module after the high-frequency inverter module is switched on;
judging whether the second inverter current is smaller than a preset second current threshold value and whether the second input voltage is smaller than a preset second voltage threshold value;
when the second inverter current is judged to be smaller than the second current threshold and the second input voltage is judged to be smaller than the second voltage threshold, controlling the phase shift angle of the high-frequency inverter module to gradually decrease from the maximum value so as to increase the second inverter current and the second input voltage;
the second voltage threshold is less than the first voltage threshold, and the second current threshold is less than the first current threshold;
the wireless charging system comprises a transmitting end and a receiving end, wherein the transmitting end comprises a rectifying module, a high-frequency inversion module and a transmitting coil which are sequentially connected, and the receiving end comprises a receiving coil, a rectifying module and a Buck module which are sequentially connected.
2. The derating control method of the wireless charging system of claim 1, wherein the step of controlling the phase shift angle of the high frequency inverter module to increase when the first inverter current is greater than the first current threshold or the first input voltage is greater than the first voltage threshold, until the first inverter current is less than the first current threshold and the first input voltage is within a preset module turn-on voltage range is followed by the step of:
acquiring real-time input voltage of the Buck module;
and reducing the output current of the Buck module according to a preset current regulation strategy and the real-time input voltage.
3. The wireless charging system derating control method of claim 2, wherein after the step of reducing the output current of the Buck module according to a preset current regulation strategy and the real-time input voltage, the method further comprises:
detecting electric quantity information of a rechargeable battery, wherein the rechargeable battery is connected with the output end of the Buck module;
judging whether the electric quantity of the rechargeable battery is full according to the electric quantity information;
and when the rechargeable battery is fully charged, finishing charging.
4. The wireless charging system derating control method of claim 1, wherein the module turn-on voltage range comprises a module turn-on voltage to the first voltage threshold, the module turn-on voltage, the second voltage threshold, and the first voltage threshold increasing in sequence.
5. A wireless charging system derating control apparatus, the apparatus comprising:
the information acquisition unit is used for acquiring a first inversion current of a high-frequency inversion module at a transmitting end of the wireless charging system and a first input voltage of a Buck module at a receiving end;
an information judgment first unit, configured to judge whether the first inverter current is greater than a preset first current threshold or whether the first input voltage is greater than a preset first voltage threshold;
a module control first unit, configured to control a phase shift angle of the high-frequency inverter module to increase when the first inverter current is greater than the first current threshold or the first input voltage is greater than the first voltage threshold, until the first inverter current is less than the first current threshold and the first input voltage is within a preset module turn-on voltage range;
the device further comprises:
the information monitoring unit is used for detecting a second inverter current of the high-frequency inverter module and a second input voltage of the Buck module after the high-frequency inverter module is switched on;
an information determination second unit, configured to determine whether the second inverter current is smaller than a preset second current threshold and whether the second input voltage is smaller than a preset second voltage threshold;
the module control second unit is used for controlling the phase shift angle of the high-frequency inversion module to gradually decrease from the maximum value when the second inversion current is judged to be smaller than the second current threshold and the second input voltage is judged to be smaller than the second voltage threshold, so that the second inversion current and the second input voltage are increased;
the second voltage threshold is less than the first voltage threshold, and the second current threshold is less than the first current threshold;
the wireless charging system comprises a transmitting end and a receiving end, wherein the transmitting end comprises a rectifying module, a high-frequency inversion module and a transmitting coil which are sequentially connected, and the receiving end comprises a receiving coil, a rectifying module and a Buck module which are sequentially connected.
6. The wireless charging system derating control device of claim 5, wherein the device further comprises:
the voltage acquisition unit is used for acquiring the real-time input voltage of the Buck module;
and the current adjusting unit is used for reducing the output current of the Buck module according to a preset current adjusting strategy and the real-time input voltage.
7. The wireless charging system derating control device of claim 6, wherein the device further comprises:
the electric quantity detection unit is used for detecting the electric quantity information of a rechargeable battery, wherein the rechargeable battery is connected with the output end of the Buck module;
the electric quantity judging unit is used for judging whether the electric quantity of the rechargeable battery is full according to the electric quantity information;
and the charging control unit is used for finishing charging when the electric quantity of the rechargeable battery is full.
8. A wireless charging system, characterized in that it comprises a wireless charging system derating control device according to any one of claims 5-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110082874.6A CN112421790B (en) | 2021-01-21 | 2021-01-21 | Derating control method and device for wireless charging system and wireless charging system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110082874.6A CN112421790B (en) | 2021-01-21 | 2021-01-21 | Derating control method and device for wireless charging system and wireless charging system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112421790A CN112421790A (en) | 2021-02-26 |
| CN112421790B true CN112421790B (en) | 2021-05-28 |
Family
ID=74782839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110082874.6A Active CN112421790B (en) | 2021-01-21 | 2021-01-21 | Derating control method and device for wireless charging system and wireless charging system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112421790B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115940363B (en) * | 2023-02-23 | 2023-05-12 | 合肥有感科技有限责任公司 | Wireless charging transmitting terminal adjusting method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354376A (en) * | 2013-06-26 | 2013-10-16 | 清华大学深圳研究生院 | Intelligent universal wireless charging system for mobile phone |
| CN108282035A (en) * | 2018-02-07 | 2018-07-13 | 山东大学 | Wireless electric energy transmission device and method suitable for anti-systematic parameter wide swings |
| CN110994811A (en) * | 2019-12-20 | 2020-04-10 | 中兴新能源汽车有限责任公司 | Wireless charging system, control method and automobile wireless charging device |
| CN111016694A (en) * | 2019-12-17 | 2020-04-17 | 华为技术有限公司 | Wireless charging transmitting terminal, receiving terminal, method and system |
| CN111541294A (en) * | 2020-07-07 | 2020-08-14 | 深圳赫兹创新技术有限公司 | Wireless charging system and starting method thereof |
| CN111740511A (en) * | 2020-07-20 | 2020-10-02 | 深圳赫兹创新技术有限公司 | Frequency conversion control method and device for wireless charging system and storage medium |
| CN112193088A (en) * | 2020-12-07 | 2021-01-08 | 深圳赫兹创新技术有限公司 | Wireless charging method and device for unmanned aerial vehicle |
| CN112202250A (en) * | 2020-12-07 | 2021-01-08 | 深圳赫兹创新技术有限公司 | Wireless charging control method and device and wireless charging system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108429359B (en) * | 2013-09-04 | 2021-05-04 | 恩智浦美国有限公司 | Wireless power transmitter with wide input voltage range and method of operating the same |
-
2021
- 2021-01-21 CN CN202110082874.6A patent/CN112421790B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354376A (en) * | 2013-06-26 | 2013-10-16 | 清华大学深圳研究生院 | Intelligent universal wireless charging system for mobile phone |
| CN108282035A (en) * | 2018-02-07 | 2018-07-13 | 山东大学 | Wireless electric energy transmission device and method suitable for anti-systematic parameter wide swings |
| CN111016694A (en) * | 2019-12-17 | 2020-04-17 | 华为技术有限公司 | Wireless charging transmitting terminal, receiving terminal, method and system |
| CN110994811A (en) * | 2019-12-20 | 2020-04-10 | 中兴新能源汽车有限责任公司 | Wireless charging system, control method and automobile wireless charging device |
| CN111541294A (en) * | 2020-07-07 | 2020-08-14 | 深圳赫兹创新技术有限公司 | Wireless charging system and starting method thereof |
| CN111740511A (en) * | 2020-07-20 | 2020-10-02 | 深圳赫兹创新技术有限公司 | Frequency conversion control method and device for wireless charging system and storage medium |
| CN112193088A (en) * | 2020-12-07 | 2021-01-08 | 深圳赫兹创新技术有限公司 | Wireless charging method and device for unmanned aerial vehicle |
| CN112202250A (en) * | 2020-12-07 | 2021-01-08 | 深圳赫兹创新技术有限公司 | Wireless charging control method and device and wireless charging system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112421790A (en) | 2021-02-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10461549B2 (en) | Mobile terminal, DC-charging power source adaptor, and charging method | |
| EP3958430B1 (en) | Electronic device, method and system for wireless charging | |
| US9818530B2 (en) | Adaptive wireless power transfer system and method | |
| US11290801B2 (en) | Headset charging system and headset charging method | |
| US20140132206A1 (en) | Portable Battery Charger with Inductive Charging | |
| CN105140985A (en) | Mobile terminal, direct-charge power adapter and charging method | |
| EP2985863A1 (en) | Power receiving device, receiving power regulation method, receiving power regulation program, and semiconductor device | |
| CN105529802A (en) | Charging system | |
| CN108879857A (en) | A kind of universal lithium battery wireless charging system | |
| CN110224497B (en) | High-integration linear charging voltage stabilizing circuit and application thereof | |
| WO2023004716A1 (en) | Charging/discharging apparatus, battery charging and discharging method, and charging/discharging system | |
| CN112202250B (en) | Wireless charging control method and device and wireless charging system | |
| CN106786886A (en) | A kind of wireless charging system charging method based on remained capacity technology | |
| CN114465332B (en) | Power supply switching system and method for wired charging and wireless charging | |
| US11881732B2 (en) | Active receiver overvoltage and overpower protection in wireless power transfer | |
| CN112421790B (en) | Derating control method and device for wireless charging system and wireless charging system | |
| CN202435059U (en) | Lithium cell charging and discharging management circuit | |
| CN105529754A (en) | Cell packet and charging method thereof, and electric tool employing cell packet | |
| CN205355893U (en) | Mobile terminal and charger | |
| CN210074886U (en) | High integration linear charging voltage stabilizing circuit and charging circuit for low power device | |
| JP3772665B2 (en) | Battery charger | |
| CN202513643U (en) | Starting-charging device | |
| JP7002553B2 (en) | Control method of wireless charging device, control device and wireless charging device | |
| US20230219457A1 (en) | Charging and discharging apparatus and power transmission method thereof | |
| CN113178927A (en) | Charging system and method capable of automatically adjusting charging mode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |