TWI533558B - Wireless charging device and method for detecting abnormal condition in a wireless charging system - Google Patents

Description

Wireless charging device and wireless charging abnormality detecting method

The invention relates to a charging device and a charging abnormality detecting method, in particular to a wireless charging device and a wireless charging abnormality detecting method.

Wireless charging technology, also known as non-contact charging, improves the use because it does not need to rely on wires to transmit power to avoid the risk of possible electric shock, nor does it require a power outlet without the entanglement of multiple wires. Safety and convenience, wireless charging technology has been widely used in many products on the market.

The wireless charging device transmits power through the principle of electromagnetic induction, and the charger transmits power to the powered electronic device by means of coil coupling. The charger includes a wireless power transmitting module, and the powered electronic device includes a wireless device. The power receiving module is in close contact with the secondary coil in the wireless power receiving module to transmit power through the primary coil in the wireless power transmitting module, wherein the secondary coil is matched to the primary coil. The main coil generates a magnetic current after being energized, and the secondary coil generates an induced current due to electromagnetic induction. After the induced current is converted into direct current, the electronic device starts charging with the direct current, thus completing the transmission of the electric power.

During the charging process, the wireless power receiving module stores the power value supplied by the electronic device in the packet and transmits it to the charger through the secondary coil, and the charger then obtains the power in the packet through the demodulation circuit. The value, according to the control error value (control error) signal through the control circuit to increase or decrease the power transmitted by the wireless power transfer module, so that the power is repeatedly transmitted and the packet is received until the charging is completed, the charger stops transmitting power.

However, when there is a metal object between the charger and the electronic device, the metal object absorbs a part of the electric power, and the eddy current loss causes the electric power to be converted into thermal energy, so that the power is not efficiently transmitted from the charger to the electronic device. When the charger delivers power with higher power, it may be dangerous to heat the metal object above the boiling point in a short time. Therefore, the Wireless Power Consortium (WPC) will also list metal object detection as One of the wireless charging standard certification procedures.

In the principle of previously detecting metal objects, it is necessary to judge the presence or absence of metal foreign objects through a large number of complicated mathematical operations. Such an operation amount will make the wafer for detecting metal objects difficult to design and the wafer operation time is too long. As a result, the cost of the product is difficult to achieve or the cost of manufacturing the product is greatly increased.

In view of the above, the present invention provides a wireless charging device and a wireless charging abnormality detecting method for detecting the presence of a metal object by a current generated when the wireless power transmitting module transmits power and a packet transmitted by the electronic device.

In an embodiment, the wireless charging device includes a wireless power transmitting module, a first processing unit, a second processing unit, a critical range generating unit, and a third processing unit. The wireless power transmitting module is coupled to the wireless power receiving module. The first processing unit is electrically connected to the wireless power transmitting module, and detects a current generated when the wireless power transmitting module transmits power. The second processing unit is configured to generate the detection parameter according to the packet transmitted from the electronic device. The critical range generating unit is electrically connected to the first processing unit and generates a critical range according to the current. The third processing unit is electrically connected to the second processing unit and the critical range generating unit to receive the detection parameter and the critical range, and determines whether the detection parameter exceeds a critical range. When the detection parameter exceeds the critical range, the third processing unit An abnormal signal is sent.

In an embodiment, the first processing unit generates a transmission power value according to a current generated when the wireless power transmission module transmits power, and the second processing unit is electrically connected to the first processing unit, and the packet includes a received power value, and the second The processing unit generates a detection parameter according to the received power value and the transmission power value, where the detection parameter is a ratio of the received power value to the transmitted power value, wherein the critical range is a preset ratio range corresponding to the current.

In an embodiment, the first processing unit generates a transmission power value according to a current generated when the wireless power transmission module transmits power, and the second processing unit is electrically connected to the first processing unit, and the packet includes a received power value, and the second The processing unit generates a detection parameter according to the received power value and the transmission power value, where the detection parameter is a difference between the received power value and the transmitted power value, wherein the critical range is a preset difference range corresponding to the current.

In an embodiment, the packet includes a received power value, the detected parameter is a received power value, and the critical range is a preset received power range corresponding to the current.

In an embodiment, the transmit power value is generated based on a preset transmit power value that is individually corresponding to the current.

In an embodiment, the packet includes a received power value, and the second processing unit calculates the received current value according to the received power value, where the detected parameter is the received current value, and the critical range is the preset received current range corresponding to the current.

In one embodiment, the critical range is generated based on a predetermined critical range for each of the currents.

In an embodiment, the wireless charging device further includes a temperature detector for detecting a temperature between the wireless power transmitting module and the wireless power receiving module to generate the first temperature and the second temperature, the first temperature and the first The time generated by the two temperatures does not overlap each other, and the temperature detector generates a temperature difference according to the first temperature and the second temperature and determines whether the temperature difference exceeds a preset temperature difference. When the temperature difference exceeds the preset temperature difference, the temperature detector determines Whether the second temperature exceeds the temperature threshold, when the second temperature exceeds the temperature threshold, the temperature detector outputs a detection signal to the third processing unit.

In an embodiment, the third processing unit is further configured to send an abnormal signal according to the detection signal.

In an embodiment, the third processing unit is further configured to compare the detection parameter with the preset threshold. When the detection parameter exceeds the preset threshold, the third processing unit sends an abnormal signal, wherein the critical range generating unit is further configured to generate the preset. threshold.

In an embodiment, the wireless charging device further includes a power adjusting unit for turning off the wireless power transmitting module or controlling the power adjusting unit according to the abnormal signal to reduce the value of the current.

In an embodiment, the second processing unit generates the first detection parameter and the second detection parameter according to the first packet and the second packet that are sequentially transmitted by the electronic device, where the first detection parameter and the second detection parameter are separated by a preset time. The third processing unit calculates a difference between the first detection parameter and the second detection parameter to determine whether the difference exceeds the difference threshold range, and when the difference does not exceed the difference threshold range, the third processing unit determines whether the second detection parameter exceeds The critical range, wherein the critical range generating unit is further used to generate a difference threshold range.

In an embodiment, the first detection parameter is a first received power value, and the second detection parameter is a second received power value.

In one embodiment, a wireless charging abnormality detecting method includes: transmitting a power to a wireless power receiving module of the electronic device by the wireless power transmitting module, detecting a current generated when the wireless power transmitting module transmits power, and receiving the electronic device; The transmitted packet, the detection parameter is generated according to the packet, the critical range is generated according to the current, and the detection parameter is judged whether the detection parameter exceeds the critical range. When the detection parameter exceeds the critical range, the third processing unit sends an abnormal signal.

In an embodiment, the packet includes a received power value, and after detecting the current generated when the wireless power transmitting module sends power, the method further includes generating a transmit power according to a current generated when the wireless power transmitting module sends power. The value is a ratio of the received power value to the transmitted power value, wherein the critical range is a preset ratio range corresponding to the current.

In an embodiment, the packet includes a received power value, and after detecting the current generated when the wireless power transmitting module sends power, the method further includes generating a transmit power according to a current generated when the wireless power transmitting module sends power. The value of the detection parameter is the difference between the received power value and the transmitted power value, wherein the critical range is a preset difference range corresponding to the current.

In an embodiment, the packet includes a received power value, and the detected parameter is a received power value, and the critical range is a preset received power range corresponding to the current.

In an embodiment, the packet includes a received power value, and in the step of generating a detection parameter according to the packet, the received current value is generated according to the received power value, and the detected parameter is the received current value, and the critical range is a preset corresponding to the current. Receive current range.

In an embodiment, before performing the step of determining whether the detection parameter exceeds a critical range, the method further includes detecting a temperature between the wireless power transmitting module and the wireless power receiving module to generate a first temperature and a second temperature, according to the first A temperature difference between the temperature and the second temperature determines whether the temperature difference exceeds a preset temperature difference. When the temperature difference exceeds the preset temperature difference, determining whether the second temperature exceeds a temperature threshold, wherein the first temperature and the second temperature are generated. Time does not overlap each other.

In an embodiment, the step of determining whether the detection parameter exceeds the critical range further comprises: when the detection parameter exceeds the critical range, turning off the wireless power transmission module or reducing the power transmitted by the wireless power transmission module.

In an embodiment, before performing the step of determining whether the detection parameter exceeds a critical range, determining whether the detection parameter exceeds a preset threshold, and when the detection parameter exceeds a preset threshold, an abnormal signal is issued.

In an embodiment, before performing the step of determining whether the detection parameter exceeds a critical range, the method further includes: repeating the step of receiving the packet transmitted by the electronic device to sequentially receive the first packet and the second packet transmitted by the electronic device; Performing a step of generating a detection parameter according to the packet to generate a first detection parameter and a second detection parameter, and the first detection parameter is separated from the second detection parameter by a preset time interval; and calculating the first detection parameter and the second detection parameter The difference is used to determine whether the difference exceeds the difference threshold range. When the difference does not exceed the difference threshold, it is determined whether the second detection parameter exceeds the critical range.

In summary, the wireless charging device and the wireless charging abnormality detecting method according to an embodiment of the present invention generate a detection parameter by using a current generated when the wireless power transmitting module transmits power and a packet transmitted by the electronic device, and according to The current is used to generate a critical range, and it is judged whether there is metal foreign matter or other foreign matter having conductive properties between the wireless power transmitting module and the wireless power receiving module by determining whether the detected parameter exceeds a critical range. The electroless charging device and the wireless charging abnormality detecting method according to the present invention can determine whether metal foreign matter or other foreign matter having conductive properties are present in the wireless charging device and the electronic device to be charged without a large number of complicated mathematical operations. between.

Please refer to FIG. 1 , which is a functional block diagram of a wireless charging device according to a first embodiment of the present invention, and discloses a wireless charging device 1 . The wireless charging device 1 is for charging the electronic device 2, and the wireless charging device 1 includes a wireless power transmitting module 11, a first processing unit 12, a second processing unit 13, a critical range generating unit 14, a third processing unit 15, and power. Adjustment unit 18. The wireless power transmitting module 11 is coupled to the wireless power receiving module 21 of the electronic device 2 to charge the electronic device 2 . The first processing unit 12 and the critical range generating unit 14 are sequentially connected in series between the wireless power transmitting module 11 and the third processing unit 15. The second processing unit 13 is coupled between the wireless power transmitting module 11 and the third processing unit 15 . The power adjustment unit 18 is electrically connected between the wireless power transmission module 11 and the third processing unit 15 .

As shown, the first processing unit 12 is coupled to the wireless power transmission module 11 to generate a current I _T, and a current I _T generated based on the transmission power value P _T 1. The second processing unit 13 receives the packet Pkt transmitted by the wireless power transmitting module 11 and includes the received power information, and receives the transmission power value P _T generated by the first processing unit 12 to generate the detection parameter P. The critical range generating unit 14 receives the current I _T to generate a critical range TH. The third processing unit 15 determines whether or not metal foreign matter exists between the wireless power transmitting module 11 and the wireless power receiving module 21 by determining whether the detected parameter P exceeds the critical range TH. When the metal foreign matter is present, the third processing unit 15 sends an abnormal signal S _Ab to control the power adjustment unit 18.

In practice, the first processing unit 12, the second processing unit 13, the critical range generating unit 14, the third processing unit 15, and the power adjusting unit 18 may be individual Micro Controller Units (MCUs). Show), or integrate it into the same Central Processing Unit (CPU) (not shown), and control its operation through firmware or software programming to determine the wireless power transmission module 11 Whether or not metal foreign matter is present between the wireless power receiving module 21.

Please refer to FIG. 2, which is a flowchart (1) of a wireless charging abnormality detecting method according to an embodiment of the present invention. Referring to FIGS. 1 and 2 simultaneously, the wireless power transmitting module 11 transmits the power E to the wireless power receiving module 21 (step S01) to charge the electronic device 2. After the power E is transmitted, the first processing unit 12 detects the current I _T generated when the wireless power transmitting module 11 transmits the power E (step S02), and the critical range generating unit 14 generates the critical range TH according to the current I _{T .} (Step S03); on the other hand, the detection parameter P is generated by the second processing unit 13 based on the packet Pkt transmitted from the electronic device 2 (step S04); accordingly, the third processing unit 15 determines by Whether the detection parameter P exceeds the critical range TH (step S06) to determine whether there is metal foreign matter between the wireless power transmitting module 11 and the wireless power receiving module 21, and when the metal foreign matter is present, the third processing unit 15 sends an abnormal signal S _Ab (Step S07).

The abnormal signal S _Ab is used to close or limit the wireless power transmitting module 11 to prevent the temperature of the metal foreign matter from continuously rising. The wireless charging device 1 further includes a power adjusting unit 18 coupled to the third processing unit 15, and the third processing unit 15 outputs the abnormal signal S _Ab to the power adjusting unit 18 to control the wireless power transmitting module 11 to reduce the value of the current I _T . Alternatively, the power adjustment unit 18 directly turns off the wireless power transmitting module 11 to stop transmitting the power E.

If the metal foreign object is connected to be detected, the wireless power transmitting module 11 repeatedly performs step S01 to send the power E to the wireless power receiving module 21. After each power E is sent, the second processing unit 13 sequentially follows the self-electronics. The packet Pkt transmitted by the wireless power receiving module 21 of the device 2 (step S04) sequentially generates the detection parameter P (step S05) to detect the presence or absence of metal foreign matter.

The detection parameter P may represent a power consumption value (abbreviated as a loss value) or a power conversion efficiency value (abbreviated as an efficiency value) caused by the wireless transmission of the power E, or the detection parameter P may represent the wireless power receiving module 21 The received power value or the received current value corresponding to the received power E. In the present embodiment, the detection parameter P is the aforementioned efficiency value or loss value. Further description will be made below for different detection parameters P.

Taking the detection parameter P as an example of the efficiency value described above, the second processing unit 13 calculates a ratio of the received power value to the transmission power value P _T corresponding to the power E to calculate a detection parameter P indicating the efficiency value. Before the wireless charging device 1 starts the detection of the metal foreign object, the value of the current I _T that may be generated under different power E transmission conditions is counted, and then each of the different currents I _T is generated through calculation or actual measurement. The power value P _{T is} transmitted, and each of the transmission power values P _{T is} stored in advance in a register (not shown) of the central processing unit. After the start of the metal foreign object detection, the first processing unit 12 generates a transmission power value P _T corresponding to the current I _T according to the register (step S08). In other words, the transmit power value is generated based on the preset transmit power value corresponding to the current I _T . Alternatively, in other embodiments, the transmit power value P _T can also be obtained by instantaneously performing a mathematical operation on the current value of the current I _T when performing metal foreign object detection.

On the other hand, after the wireless power transmission module 11 receives the packet Pkt including the received power information (step S04), the second processing unit 13 transmits the packet to generate the received power value. This group, the second processing unit 13 receives the transmission power value and the power value P _T phase divided by the ratio represents the efficiency value, this ratio is the detection parameter P.

In addition, the detection parameter P may be a loss value of power conversion when the foregoing power E is wirelessly transmitted. The second processing unit 13 coupled to the first processing unit 12 subtracts the received power value included in the packet Pkt from the transmission power value P _T generated by the first processing unit 12 to generate a difference value as the detection parameter P (step S05). The difference value indicates the loss value at the time of power conversion. As for how to generate the received power value and the transmission power value P _T have been described in detail above, and details are not described herein again.

As shown in FIG. 2, the critical range generating unit 14 generates a critical range TH based on the value of the current I _T (step S03), and the third processing unit 15 determines whether the detected parameter P exceeds the critical range TH (step S06). Therefore, the critical range TH has the same unit as the detection parameter P. In other words, the critical range TH can be selected from a preset receiving current range, a preset receiving power range, a preset ratio range, or a preset difference range, which are different in the foregoing. One of the preset ranges is used as the preset critical range, so the critical range TH is generated according to one of the preset critical ranges corresponding to the current I _T .

Similarly, the threshold range TH is a preset ratio range indicating the efficiency value as an example. Before the wireless charging device 1 performs detection, an experiment is performed according to different wireless charging devices, and a load characteristic curve between the wireless power transmitting module and the wireless power receiving module of each wireless charging device is recorded. Selecting an efficiency value corresponding to each current I _T in the load characteristic curve as a base value plus an allowable error range to generate a preset ratio range to cover different efficiency values, and storing the preset ratio range in the central processing The register of the device is used as a reference for judging whether there is metal foreign matter between the wireless power transmitting module and the wireless power receiving module. For example, if the current I _T is 7 mA, the current I in the same load characteristic curve The efficiency values corresponding to _T are 0.59, 0.55, 0.58, 0.62, and 0.61, respectively, and 0.6 is selected as the base value plus the error range of 0.3 to become 0.63 and 0.57 as the preset ratio range corresponding to the current I _T of 7 mA, and 0.63 and 0.57 are stored in the scratchpad. When detecting the wireless charging device 1 is assumed that current I _T is 7mA, critical range generation unit 14 reads the register to obtain a corresponding line current I _T of 7mA is critical range TH, i.e., 0.57 and 0.63, the third processing unit 15 further judges whether the detection parameter P generated by the second processing unit 13 exceeds between 0.57 and 0.63. In some embodiments, the third processing unit 15 may also determine whether a metal foreign object exists according to two load characteristic curves or three load characteristic curves or even four load characteristic curves, and the present invention is not limited thereto.

Furthermore, in some embodiments, the aforementioned error range may also be replaced by a percentage, and the base value and the percentage of the base value corresponding to the error range are stored in the register for metal foreign object determination. For example, the foregoing preset ratio range is between 0.57 and 0.63, the base value is 0.6, the error range is 0.3, and the percentage of the base value is 5%, and 0.6 and 5% are stored in the register. By virtue of this, the critical range generation unit 14 reads the register and to generate a corresponding operation system is the critical current I _T TH based 7mA range of 0.57 (5% * 0.6-0.6) and 0.63 (0.6 * 0.6 + 5%) The third processing unit 15 further determines whether the detection parameter P exceeds between 0.57 and 0.63.

The critical range TH represents the preset difference range of the wear value as an example. Before detecting the metal foreign object, selecting a loss value corresponding to each current I _T in the load characteristic curve as a base value plus an allowable error range to generate a preset difference range is used as a judgment wireless power transmitting module and Whether there is a reference for metal foreign objects between the wireless power receiving modules and storing them in the register of the central processing unit. Alternatively, the aforementioned error range may also be replaced with a percentage of the base value. The general method has been described in detail above and will not be described here.

The second processing unit 13 can also generate the detection parameter P based only on the packet Pkt. In other words, the detection parameter P at this time is the received power value or the received current value corresponding to the power E received by the wireless power receiving module 21 .

When the detection parameter P is the received power value, the second processing unit 13 generates the detection parameter P based on the packet Pkt including the received power value, and it is not necessary to perform step S08 as shown in FIG. At this time, the critical range TH of the reference for indicating the detection parameter P in the presence of the metal-free foreign matter is selected from the preset reception power range. Before performing the metal foreign object detection, selecting a received power value corresponding to each current I _T in the load characteristic curve as a base value plus an allowable error range to generate a preset receiving power range as a judgment wireless power transmitting mode Whether there is a reference for metal foreign objects between the group and the wireless power receiving module, and storing it in the register of the central processing unit. Alternatively, the aforementioned error range may also be replaced with a percentage of the base value. The general method has been described in detail above and will not be described here.

When the detection parameter P is the received current value, the second processing unit 13 can calculate the received current value based on the packet Pkt including the received power value. At this time, the critical range TH of the reference for indicating the detection parameter P in the presence of the metal-free foreign matter is selected from the preset receiving current range. Selecting a receiving current value corresponding to each current I _T in the load characteristic curve as a base value plus an allowable error range to generate a preset receiving current range as a determination between the wireless power transmitting module and the wireless power receiving module There is a reference for the metal foreign object and it is stored in the central processor's register. Alternatively, the aforementioned error range may also be replaced with a percentage of the base value. The general method has been described in detail above and will not be described here.

Please refer to FIG. 3, which is a flowchart (2) of the wireless charging abnormality detecting method according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 3 at the same time. In the embodiment, when the metal foreign object is detected, the third processing unit 15 first determines whether there is metal foreign matter between the wireless power transmitting module 11 and the wireless power receiving module 21 according to the preset threshold TH _PRE . The threshold TH _PRE is pre-stored in the register before detecting the metal foreign object, and has the same unit as the detection parameter P.

As shown in FIG. 3, after step S05, the third processing unit 15 directly determines whether the detection parameter P exceeds the preset threshold TH _PRE (step S09), and when the detection parameter P exceeds the preset threshold TH _PRE , the third processing unit 15 sends an abnormal signal S _Ab (step S07), and when the detected parameter P does not exceed the preset threshold TH _PRE , the third processing unit 15 first judges whether the detected parameter P exceeds the critical range TH (step S06). Therefore, the third processing unit 15 includes a multiplexer (not shown) to select the critical range TH generated by the critical range generating unit 14 or the preset threshold TH _PRE to be judged, and is controlled by the firmware according to different requirements. The multiplexer makes a selection. Alternatively, the control threshold range generating unit 14 selects the output preset threshold TH _PRE or the critical range TH according to different needs.

Further, in the electronic product using wireless charging, the electronic device 2 includes a load circuit (not shown). Therefore, during charging, the electronic device 2 may be affected by the load circuit to output a packet Pkt having the wrong power information. The detection parameter P generated by the second processing unit 13 according to the packet Pkt has no reference value, thereby causing misjudgment of metal foreign object detection. Therefore, in an embodiment of the wireless charging abnormality detecting method according to the present invention, in order to prevent the occurrence of a false positive, the third processing unit 15 performs the detection of the metal foreign object after the variation interval of the parameter P to be detected meets the difference threshold range TH _R .

Please refer to FIG. 4, which is a flowchart (3) of the wireless charging abnormality detecting method according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 4 at the same time. Before determining whether the detection parameter P exceeds the critical range TH (step S06), the wireless power transmission module 11 sequentially receives the packets Pkt containing the received power information transmitted from the electronic device 2, and each packet Pkt is generated by a time interval. The time interval, in other words, the time difference between each packet Pkt received by the wireless power transmission module 11 is not continuous (for convenience of description, the first and second received packets Pkt are respectively referred to as the first a packet and a second packet, and the detection parameters P generated according to the first packet and the second packet are respectively referred to as a first detection parameter and a second detection parameter, and the rest are derived, and the third processing unit 15 (step S10) calculating a difference between the first detection parameter and the second detection parameter (step S11), and determining whether the difference exceeds the difference threshold range (step S12) to determine whether the detection parameter P2 has a reference value. When the difference does not exceed the difference threshold range TH _R , the third processing unit 15 first judges whether or not the detection parameter P2 exceeds the critical range TH (step S06). In some embodiments, the user can arbitrarily set the preset time interval.

Here, the wireless charging device 1 further includes a counter (not shown) to count the number of packets Pkt and output a count value. For example, the first packet corresponds to the count value 1. The third processing unit 15 determines whether the difference is calculated by determining whether the preset time interval is reached based on the count value. The preset processing time interval is 5 and the difference threshold range TH _R is 0.06. The third processing unit 15 first stores the first detection parameter, and when the count value reaches 5, stores the fifth detection parameter. At this time, the third processing unit 15 calculating a difference between the fifth detection parameter and the first detection parameter (step S11), when the difference does not exceed the difference threshold range TH _R (ie, 0.06), the third processing unit 15 first determines whether the detection parameter P5 exceeds the critical range. TH; otherwise, if the difference exceeds the difference threshold range TH _R , the third processing unit 15 does not determine whether the fifth detection parameter exceeds the critical range TH, and the difference between the tenth detection parameter and the fifth detection parameter does not exceed the difference threshold range when TH _R, the third processing unit 15 determines the beginning of the tenth detection parameter exceeds a threshold range TH. Based on this, the third processing unit 15 determines whether the detection parameter P has a reference value by the difference between the two detection parameters and the difference threshold range TH _R .

Please refer to FIG. 5, which is a flowchart (4) of the wireless charging abnormality detecting method according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 5 at the same time. In some embodiments, the wireless charging device 1 further includes a temperature detector 16 disposed adjacent to the wireless power transmitting module 11 and the wireless power receiving module 21 to detect the temperature. Since the metal foreign matter causes the temperature of its own to rise after absorbing the electric power E, the temperature detector 16 determines whether or not metal foreign matter exists by the temperature. As shown in FIG. 1, the temperature detector 16 is disposed between the wireless power transmitting module 11 and the wireless power receiving module 21 (for convenience of description, the temperature detector 16 detects when the electronic device 2 transmits the first packet. The temperature is referred to as the first temperature, and the temperature detected by the temperature detector 16 when the electronic device 2 transmits the second packet is referred to as the second temperature, and the rest is deduced accordingly. In some embodiments, the first temperature is separated from the second temperature by a predetermined time interval, and the user can arbitrarily set the preset time interval. The temperature detector 16 first determines whether the temperature difference between the first temperature and the second temperature exceeds a preset temperature difference. When the temperature difference exceeds the preset temperature difference, the temperature detector 16 determines whether the second temperature exceeds the temperature threshold. At this time, if the second temperature exceeds the temperature threshold, it indicates that metal foreign matter is present. Conversely, when the temperature difference between the first temperature and the second temperature does not exceed the preset temperature difference, the temperature detector 16 determines whether the temperature difference between the third temperature and the second temperature exceeds a preset temperature difference, This type of push. Here, in some embodiments, the temperature detector 16 can perform temperature detection according to the count value generated by the counter, and pre-store the preset temperature difference and the temperature threshold in the register of the central processing unit. Temperature detection.

As shown in FIG. 5, before performing step S06, the temperature detector 16 detects the temperature between the wireless power transmitting module and the wireless power receiving module to generate the first temperature and the second temperature (step S13). The detector 16 generates a temperature difference according to the first temperature and the second temperature (step S14), and the temperature detector 16 determines whether the temperature difference exceeds the preset temperature difference (step S15), when the temperature difference exceeds the preset temperature difference, The temperature detector 16 compares the second temperature with the temperature threshold to determine whether the temperature exceeds the temperature threshold (step S16). When the second temperature exceeds the temperature threshold, the temperature detector 16 sends a detection signal Ctrl to control the third processing. The unit 15 issues an abnormal signal S _AB (step S07).

In summary, the wireless charging device and the wireless charging abnormality detecting method according to an embodiment of the present invention generate a detection parameter by using a current generated when the wireless power transmitting module transmits power and a packet transmitted by the electronic device, and according to The current is used to generate a critical range, and it is judged whether there is metal foreign matter or other foreign matter having conductive properties between the wireless power transmitting module and the wireless power receiving module by determining whether the detected parameter exceeds a critical range. The electroless charging device and the wireless charging abnormality detecting method according to the present invention can determine whether metal foreign matter or other foreign matter having conductive properties are present in the wireless charging device and the electronic device to be charged without a large number of complicated mathematical operations. between.

The present invention has been disclosed in the above embodiments, and it is not intended to limit the present invention. Any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended patent application.

S01‧‧‧ sends power to a wireless power receiving module of an electronic device by a wireless power transmitting module
S02‧‧‧Detects a current generated when the power transmission module sends power
S03‧‧‧ generates a critical range based on current
S04‧‧‧ Receive a packet from the electronic device
S05‧‧‧ Generate a test parameter based on the packet
S06‧‧‧Review whether the test parameters exceed the critical range
S07‧‧‧ issued an abnormal signal
S08‧‧‧ Generate a transmit power value based on current
S09‧‧‧Review whether the test parameters exceed the preset threshold
S10‧‧‧ generates another detection parameter based on another packet at a preset time interval
S11‧‧‧ Calculate the difference between the two detection parameters
S12‧‧‧Determining whether the difference exceeds a difference threshold
S13‧‧Detecting the temperature between the wireless power transmitting module and the wireless power receiving module to generate the first temperature and the second temperature
S14‧‧‧ generates a temperature difference based on the first temperature and the second temperature
S15‧‧‧Check if the temperature difference exceeds the preset temperature difference
S16‧‧‧Check if the second temperature exceeds the temperature threshold
1‧‧‧Wireless charging device
11‧‧‧Wireless Power Transmission Module
12‧‧‧First Processing Unit
13‧‧‧Second processing unit
14‧‧‧critical range generating unit
15‧‧‧ Third Processing Unit
16‧‧‧Temperature Detector
18‧‧‧Power adjustment unit
2‧‧‧Electronic equipment
21‧‧‧Wireless power receiving module
Ctrl‧‧‧Detection signal
E‧‧‧Power
I _T ‧‧‧current
P‧‧‧Test parameters
P _T ‧‧‧Transmission power value
Pkt‧‧‧Package
S _Ab ‧‧‧ Abnormal signal
TH‧‧‧critical range
TH _PRE ‧‧‧Preset threshold
TH _R ‧‧‧Differential threshold range

[Fig. 1] is a functional block diagram of a wireless charging apparatus according to a first embodiment of the present invention. [Fig. 2] is a flowchart (1) of a wireless charging abnormality detecting method according to an embodiment of the present invention. [Fig. 3] is a flowchart (2) of a wireless charging abnormality detecting method according to an embodiment of the present invention. [Fig. 4] is a flowchart (3) of a wireless charging abnormality detecting method according to an embodiment of the present invention. [Fig. 5] is a flowchart (4) of a wireless charging abnormality detecting method according to an embodiment of the present invention.

1‧‧‧Wireless charging device

11‧‧‧Wireless Power Transmission Module

12‧‧‧First Processing Unit

13‧‧‧Second processing unit

14‧‧‧critical range generating unit

15‧‧‧ Third Processing Unit

16‧‧‧Temperature Detector

18‧‧‧Power adjustment unit

2‧‧‧Electronic equipment

21‧‧‧Wireless power receiving module

Ctrl‧‧‧Detection signal

E‧‧‧Power

I _T ‧‧‧current

P‧‧‧Test parameters

P _T ‧‧‧Transmission power value

Pkt‧‧‧Package

S _Ab ‧‧‧ Abnormal signal

TH‧‧‧critical range

TH _PRE ‧‧‧Preset threshold

TH _R ‧‧‧Differential threshold range

Claims (23)

A wireless charging device for charging an electronic device, the electronic device having a wireless power receiving module, the wireless charging device comprising: a wireless power transmitting module, coupled to the wireless power receiving module; The first processing unit is electrically connected to the wireless power transmitting module to detect a current generated when the wireless power transmitting module transmits power; and a second processing unit is configured to transmit according to the electronic device One of the packets receives a power value to generate a detection parameter; a critical range generating unit electrically connected to the first processing unit, corresponding to generating a critical range according to the current; and a third processing unit electrically connected to the first The second processing unit and the critical range generating unit determine whether the detection parameter exceeds the critical range, and when the detection parameter exceeds the critical range, the third processing unit sends an abnormal signal. The wireless charging device of claim 1, wherein the first processing unit generates a transmission power value according to the current, the second processing unit is electrically connected to the first processing unit, and the second processing unit is configured according to the receiving The power value and the transmit power value generate the detection parameter, and the detection parameter is a ratio of the received power value to the transmit power value, and the critical range is a preset ratio range corresponding to the current. The wireless charging device of claim 1, wherein the first processing unit generates a transmission power value according to the current, the second processing unit is electrically connected to the first processing unit, and the second processing unit is configured according to the receiving The power value and the transmit power value generate the detection parameter, The detection parameter is a difference between the received power value and the transmitted power value, and the critical range is a preset difference range corresponding to the current. The wireless charging device of claim 1, wherein the detection parameter is the received power value, and the critical range is a preset received power range corresponding to the current. The wireless charging device of claim 2 or 3, wherein the transmit power value is generated according to a preset transmit power value corresponding to the current. The wireless charging device of claim 1, wherein the second processing unit calculates a received current value according to the received power value, wherein the detected parameter is the received current value, and the critical range is corresponding to the current. A preset receiving current range. The wireless charging device of claim 1, wherein the critical range is generated according to a preset critical range corresponding to the current. The wireless charging device of claim 1, further comprising a temperature detector for detecting a temperature between the wireless power transmitting module and the wireless power receiving module to generate a first temperature and a second a temperature, the first temperature is separated from the second temperature by a predetermined time interval, the temperature detector generates a temperature difference according to the first temperature and the second temperature, and determines whether the temperature difference exceeds a preset a temperature difference value, when the temperature difference exceeds the preset temperature difference, the temperature detector determines whether the second temperature exceeds a temperature threshold, and when the second temperature exceeds the temperature threshold, the temperature detector outputs a detection The test signal is sent to the third processing unit. The wireless charging device of claim 8, wherein the third processing unit is further configured to send the abnormal signal according to the detecting signal. The wireless charging device of claim 1, wherein the third processing unit is further configured to compare the detection parameter with a preset threshold, and when the detection parameter exceeds the preset threshold, the first The three processing unit sends the abnormal signal, wherein the critical range generating unit is further configured to generate the preset threshold. The wireless charging device of any one of claims 1 to 4 or 6 to 10, further comprising: a power adjustment unit, the wireless power transmission module is turned off according to the abnormal signal or the power adjustment unit is controlled to reduce the current The value. The wireless charging device of claim 5, further comprising: a power adjusting unit, the wireless power transmitting module is turned off according to the abnormal signal or the power adjusting unit is controlled to reduce the value of the current. The wireless charging device of claim 1, wherein the second processing unit generates a first detection parameter and a second detection parameter according to the first packet and the second packet of the electronic device. A detection parameter is separated from the second detection parameter by a predetermined time interval, and the third processing unit calculates a difference between the first detection parameter and the second detection parameter to determine whether the difference exceeds a difference threshold range. When the difference does not exceed the difference threshold, the third processing unit determines whether the second detection parameter exceeds the critical range, wherein the critical range generating unit is further configured to generate the difference threshold range. The wireless charging device of claim 13, wherein the first detection parameter is a first received power value, and the second detected parameter is a second received power value. A wireless charging abnormality detecting method includes: transmitting a power to a wireless power receiving module of an electronic device by using a wireless power transmitting module; and detecting, by a first processing unit, the wireless power transmitting module transmitting power One of the currents; Receiving, by a second processing unit, a packet transmitted by the electronic device, the packet includes a received power value; generating, by the second processing unit, a detection parameter according to the received power value; and generating, by the critical range generating unit, the current corresponding to the current a critical range; and determining, by the third processing unit, whether the detected parameter exceeds the critical range, and when the detected parameter exceeds the critical range, the third processing unit sends an abnormal signal. The wireless charging abnormality detecting method of claim 15, wherein the step of detecting the current generated when the wireless power transmitting module transmits power further includes transmitting, by the first processing unit, the wireless power according to the wireless power transmitting module The current generated by the module when generating power generates a transmission power value, where the detection parameter is a ratio of the received power value to the transmission power value, wherein the critical range is a preset ratio corresponding to the current range. The wireless charging abnormality detecting method of claim 15, wherein the step of detecting the current generated when the wireless power transmitting module transmits power further includes transmitting, by the first processing unit, the wireless power according to the wireless power transmitting module The current generated by the module when generating power generates a transmission power value, where the detection parameter is a difference between the received power value and the transmitted power value, wherein the critical range is a preset corresponding to the current The range of differences. The wireless charging abnormality detecting method of claim 15, wherein the detecting parameter is the received power value, and the critical range is a preset receiving power range corresponding to the current. The wireless charging abnormality detecting method according to claim 15, wherein in the step of generating the detecting parameter according to the received power value, the second processing unit is configured to receive the work according to the The rate value generates a receiving current value, and the detecting parameter is the receiving current value, and the critical range is a preset receiving current range corresponding to the current. The wireless charging abnormality detecting method of claim 15, wherein before the step of determining whether the detecting parameter exceeds the critical range, the method further comprises: detecting the wireless power transmitting module and the wireless power receiving module a temperature between the first temperature and a second temperature, the first temperature being separated from the second temperature by a predetermined time interval; generating a temperature difference according to the first temperature and the second temperature; Determining whether the temperature difference exceeds a preset temperature difference; and when the temperature difference exceeds the preset temperature difference, determining whether the second temperature exceeds a temperature threshold. The wireless charging abnormality detecting method of claim 15, wherein the step of determining whether the detecting parameter exceeds the critical range further comprises: when the detecting parameter exceeds the critical range, turning off the wireless power transmitting module or lowering the The current generated by the wireless power transmitting module. The wireless charging abnormality detecting method of claim 15, wherein before the step of determining whether the detecting parameter exceeds the critical range, determining whether the detecting parameter exceeds a preset threshold, when the detecting parameter exceeds the preset The exception signal is sent when the threshold is set. The wireless charging abnormality detecting method of claim 15, wherein before the step of determining whether the detecting parameter exceeds the critical range, the step of repeatedly receiving the packet transmitted by the electronic device is sequentially performed in order Receiving, by the electronic device, a first packet and a second packet; and performing a step of generating the detection parameter according to the received power value to generate a first detection parameter and a second detection parameter, and the first detection parameter And the second detection parameter The time of the number generation is separated by a preset time interval; calculating a difference between the first detection parameter and the second detection parameter to determine whether the difference exceeds a difference threshold range, when the difference does not exceed the difference threshold range And determining whether the second detection parameter exceeds the critical range.