TWI473381B - Induction power supply system and intruding metal detection method thereof - Google Patents

Description

Inductive power supply and metal foreign matter detection method thereof

The present invention relates to an inductive power supply and a metal foreign matter detecting method thereof, and more particularly to an inductive power supply capable of simultaneously performing an inductive power transfer operation and detecting the presence or absence of a metal foreign object, and a metal foreign matter detecting method thereof.

In the prior art, the most important problem related to the electromagnetic induction type power system is that it must be able to adaptively identify a chargeable device placed on a transmitting coil for waiting for an inductive power transfer operation, wherein an operating principle similar to that of an induction cooker will be used. And, in response to generating high-power electromagnetic wave energy, an inductive power transfer operation is performed. During operation, when high-power electromagnetic wave energy is received by an external metal, external metal is heated due to electromagnetic induction effects and causes danger. Under this circumstance, various manufacturers of electromagnetic induction power systems are dedicated to the development of identifiable sensing technologies, in which the technology of induction coils is commonly used to establish a wireless data signal transmission between a power receiving end and a power supply end. And use one of the receiving end of the receiving end to feed back the data signal, and use one of the transmitting end of the transmitting end to receive the data signal. In this case, a relatively effective wireless transmission mode can be provided, thereby completing the connection between the receiving end and the power supply end. Wireless data transmission and inductive power transfer operations.

However, when various manufacturers want to perform inductive power transmission operations and wireless data transmission at the same time, since the inductive power transmission operation is usually carried out by using a main carrier of high power. Loss, it is susceptible to various signal interferences in the external environment, and it is difficult to achieve wireless data transmission at the same time. Other manufacturers have established wireless data transmission under the existing inductive power transmission operation, combined with another wireless data transmission operation, such as infrared, Bluetooth, RFID tags, WiFi, etc., but need to add corresponding wireless transmission mode. In order to increase production costs and reduce market acceptance, the current market still tends to choose induction coils, and with a more efficient transmission mechanism to simultaneously perform inductive power transmission operations and wireless data transmission.

It is worth noting that under different inductive power transmission operations and wireless data transmission, a detection signal must be used on the power supply end to identify whether the chargeable device on the power receiving end is correct, and then the inductive power transmission operation is started. In other words, when the user places a metal foreign object (such as a coin, a key, a paper clip, etc.) that cannot feed back the wireless data signal on the transmitting coil of the power supply terminal, the preset signal cannot be received after the power supply terminal sends a detection signal. The correct feedback data signal, in this case will not start the inductive power transfer operation of the power supply end, to avoid the danger of heating metal foreign objects. However, the above technique still has a defect that when the power supply end determines that there is a chargeable device, and there is a metal foreign matter between the power supply end and the power receiving end, the interaction area between the transmitting coil and the receiving coil is shielded, in this case, The power supply end and the power receiving end will transmit wireless data through the unshielded area, so that the metal foreign matter may be heated due to absorption of part of the electromagnetic energy.

In response to the above problems, the corresponding solution has been proposed in the patent specification for the "Insert Parasitic Metal Detection" of Taiwan Patent Publication No. TW 201143250, which is an analysis. The difference between the input power of the power supply terminal and the power output by the power receiving terminal is the power loss value, and the excessive power loss is determined as a safe control of the metal foreign matter and then the power is turned off. However, the power loss is not caused by only metal foreign matter. When the relative position of the power supply coil and the power receiving coil is shifted, the power loss is also increased. Therefore, the technique of the invention needs to first define the power of the transmitting/receiving coil and other power conversion components. The loss data, or the power loss data corresponding to all possible metal foreign objects, is used as a basis for judging, and then compared according to the actual power loss detected during operation. However, before setting the method, it is still necessary to preset settings such as driving voltage, part characteristics, coil specifications, etc. If the preset parameters are changed during use, resetting will be required to make the design of the method inelastic. It is not easy to correctly determine whether there is an abnormal metal. In addition, the method still needs to set a current detecting circuit at the power supply end and the power receiving end to calculate the current and voltage values to measure the power change between the power supply end and the power receiving end, but the above current detecting circuit may not accurately measure the actual The power consumption is changed, and the power change of the power receiving terminal is also transmitted to the power supply terminal through wireless signal transmission, and whether the signal transmission can be completed synchronously for subsequent calculation, and the error may not be accurately determined to determine whether there is metal. The presence of foreign bodies.

Therefore, it is an important subject in the art to provide a more efficient inductive power supply and a metal foreign matter detecting method thereof, which can simultaneously perform an inductive power transmission operation and detect the presence or absence of metal foreign matter.

Therefore, the main object of the present invention is to provide an inductive power that can be simultaneously performed An inductive power supply that transmits an operation and detects the presence of metal foreign matter and a metal foreign matter detecting method thereof.

The invention discloses an inductive power supply for performing an inductive power transmission operation and detecting whether a metal foreign object exists. The inductive power supply comprises an input power module for receiving a stable voltage source; a processing module, coupled to the input power module and the storage module, for generating a control signal according to the preset data and a feedback signal; a driving module And the input power module and the processing module are configured to convert the stable voltage source to a driving voltage according to the control signal; and an induction coil coupled to the driving module for electrically transmitting the driving a voltage is applied to a power receiving device to perform the inductive power transmission operation; and a feedback module is coupled to the induction coil for generating the feedback signal according to the driving voltage received by the induction coil; wherein the preset The data is an initial state of the inductive power supply and includes a sine wave amplitude corresponding to the driving voltage in the initial state, and the induced power is performed. If the transmission operation in the presence of metallic foreign matter, one will affect the amplitude of the sinusoidal signal corresponding to the feedback, so that the processing module generates the control signal corresponds.

The invention further discloses a method for an inductive power supply, the inductive power supply comprises a processing module, an induction coil and a preset data for performing an inductive power transmission operation and simultaneously detecting the inductive Whether there is a metal foreign object in the power supply, the method comprises: switching the inductive power supply between a setting operation and an inductive power transmission operation according to a control signal; and when the inductive power supply When the setting operation is performed by the supplier, the processing module performs a first operation flow, and when the inductive power supply performs the setting operation, the processing module performs a second operation flow; wherein the pre-operation Setting the data to an initial state of the inductive power supply and forming an initial lookup table, the first operational flow modifying the initial lookup table of the inductive power supply to form a modified lookup table, the second The operation process detects whether the metal foreign object exists in the inductive power supply according to the modified lookup table.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of an inductive power supply 10 according to an embodiment of the present invention. As shown in FIG. 1 , the inductive power supply 10 includes an input power module 100 , a storage module 102 , a processing module 104 , a driving module 106 , an induction coil 108 , and a feedback module 110 . In detail, the input power module 100 is coupled to the processing module 104 and the driving module 106 and receives a stable voltage source VS, and then performs voltage dividing operation through the resistors R1 and R2 to convert the stable voltage source VS into a comparison. The low voltage VIN is transmitted to the processing module 104 for reference as a subsequent operation, and directly supplies the stable voltage source VS to the driving module 106. At the same time, one of the input power modules 100 receives the unit 1000 to convert the stable voltage source. The VS to processing module 104 is used by the power supply. The storage module 102 includes an initial state S_IS, and the initial state S_IS is a preset value of the plurality of parameters before the inductive power supply 10 performs an inductive power transfer operation. The processing module 104 is coupled to the storage module 102 and the feedback module 110 for receiving a preset value of the plurality of parameters in the initial state S_IS and a feedback signal S_FB generated by the feedback module 110 to generate a control signal S_C. To the drive module 106. One driving unit 106 of the driving module 106 is configured to receive the control signal S_C for corresponding control opening. Turning off the conduction state of the transistors SW1 and SW2, and then converting the stable voltage source VS to a driving voltage S_DV, and then converting from a capacitor C to a resonant sine wave S_DV2 and transmitting electromagnetic waves through the induction coil 108, thereby transmitting power and receiving simultaneously The main carrier of the feedback data signal. Preferably, the induction coil 108 includes an equivalent inductance value, and the driving voltage S_DV is inductively transmitted to a power receiving end (not shown) by electromagnetic wave induction, for example, a rechargeable product for performing an inductive power supply. 10 Inductive power transfer operation between the product and the rechargeable product. The feedback module 110 is coupled to the induction coil 108 and includes a first detection unit 1110 and a second detection unit 1112. The first detection unit 1110 detects the amplitude of the sine wave corresponding to the driving voltage S_DV. The change is converted to the feedback signal S_FB and transmitted to the processing module 104, and the feedback signal S_FB represents the voltage signal of the resonant sine wave S_DV2 used by the induction coil 108, and the second detecting unit 1112 detects one of the received terminals simultaneously. The feedback data signal is converted into another feedback signal S_FB1 and transmitted to the processing module 104, that is, the feedback signal S_FB1 represents the feedback data signal from the power receiving end.

Briefly, in the present embodiment, depending on whether a metal foreign object is present in the inductive power supply 10, the amplitude of the resonant sine wave S_DV2 corresponding to the stable voltage source VS will produce different variations. Accordingly, the storage module 102 of the present embodiment is pre-stored with the initial sine wave amplitude corresponding to the driving voltage S_DV of the inductive power supply 10 that is not electrically connected to any rechargeable electronic product, and is an initial state S_IS. When the inductive power transmission operation between the inductive power supply 10 and the rechargeable product is being performed, the feedback module 110 further converts the amplitude of the resonant sine wave S_DV2 corresponding to the stable voltage source VS to a feedback signal. S_FB The group 104 compares the difference in the amplitude of the sine wave between the initial state S_IS and the feedback signal S_FB, and further serves as a judging mechanism for whether the inductive power supply 10 performs an inductive power transfer operation.

Please refer to FIG. 2 . FIG. 2 is a schematic diagram showing an amplitude curve corresponding to the capacitance C and the induction coil 108 according to an embodiment of the present invention, wherein the amplitude curve is displayed on a two-dimensional coordinate, and the two-dimensional coordinate uses a plurality of operations. The frequency is taken as its X-axis, and a plurality of sine wave amplitudes are used as its Y-axis, and the capacitor C and the induction coil 108 are operated at the driving voltage S_DV. As shown in FIG. 2, since the capacitor C and the induction coil 108 can be equivalently regarded as a combination of an induction capacitor and an inductive inductor, and the equivalent capacitance value and the equivalent inductance value respectively corresponding to the induction capacitor and the inductive inductor are utilized, The stable voltage source VS received by the input power module 100 is generated by the switching power supply frequency generated by the driving module 106 to generate a resonant sine wave S_DV2, which can be formed by drawing a capacitive inductance matching corresponding to the induction coil 108 in a two-dimensional coordinate. An amplitude curve W0, wherein the amplitude curve W0 includes a maximum sine wave amplitude Amax and corresponds to an operating frequency F0, and for operation convenience, the operating frequency is set to operate the amplitude curve W0, and the user usually uses the operating frequency F0 to avoid The maximum sine wave amplitude is generated to damage the system overload, such as the operating frequencies F1, F2, F3, F4 shown in Fig. 2 and can correspond to the sine wave amplitudes A1, A2, A3, A4, respectively.

Please refer to FIG. 3 again. FIG. 3 is a schematic diagram of different amplitude curves W1 to W4 corresponding to different driving voltages V1 to V4 generated by capacitor C and induction coil 108 in different stable voltage sources VS according to an embodiment of the present invention. Voltage V1~V4 is an increment sequence. As shown in FIG. 3, when the driving voltage is gradually increased from V1 to V4, the maximum sine wave amplitudes A1max to A4max corresponding to the operating frequency F0 of the amplitude curves W1 to W4 also increase upward in the Y-axis direction, of course, If there is a different operating frequency, for example, the operating frequency F2, there is also the same incremental situation. In this case, the present embodiment can establish the value of the sine wave amplitude corresponding to the different amplitude curves W1~W4 according to different stable voltage sources VS and different operating frequencies, thereby forming a lookup table and storing it. The module 102 is correspondingly stored through a non-volatile memory (NVRAM), such as an EEPROM.

Please refer to FIG. 4 again. FIG. 4 is a schematic diagram showing different amplitude curves generated when the equivalent capacitance value and the equivalent inductance value of the capacitor C and the induction coil 108 are changed according to an embodiment of the present invention. As shown in Fig. 4, which is similar to the embodiment shown in Fig. 2, the induction coil 108 is also operated at the driving voltage S_DV, and the fixed operating frequency F2 is observed on the amplitude curve W0 to have a sine wave amplitude A2. Accordingly, when the equivalent capacitance value and the equivalent inductance value of the capacitor C and the induction coil 108 are increased, another amplitude curve W0_H will be generated correspondingly, or can be regarded as the amplitude curve W0 is shifted to the left to the amplitude curve W0_H, and the fixed work is observed. At frequency F2, the amplitude curve W0_H will generate another sine wave amplitude A2_H and less than the sine wave amplitude A2, and when the equivalent capacitance value and the equivalent inductance value of the capacitance C and the induction coil 108 decrease, the other amplitude curve W0_L will Correspondingly, it can be seen that the amplitude curve W0 is shifted to the right to the amplitude curve W0_L. When the fixed operating frequency F2 is observed, the amplitude curve W0_L will generate another sine wave amplitude A2_L and greater than the sine wave amplitude A2. Notably, if there is a metal foreign matter between the inductive power supply 10 and the rechargeable product of the power receiving end, that is, the metal foreign matter is located in the induction coil 108 interaction. On the mapping plane of one of the rechargeable products, but does not completely block the inductive power transmission operation and the wireless signal transmission between the two, the metal foreign object will absorb part of the electromagnetic wave energy to reduce the equivalent inductance value, thereby allowing the corresponding The amplitude of the sine wave becomes larger. Therefore, in this embodiment, it is determined whether a metal foreign object is interposed between the inductive power supply 10 and the rechargeable product of the power receiving end according to the change of the amplitude of the sine wave corresponding to the induction coil 108, as the inductive type continues. The judgment mechanism of the charging operation.

Preferably, the inductive power supply 10 of the present invention is also used for the inductive coil 108 not electrically coupled to any end-capable rechargeable product, and the first detecting unit of the feedback module 110 It is also within the scope of the invention to directly detect the change in the amplitude of the resonant sine wave S_DV2 to determine whether any metal foreign matter has entered the range of the inductive charging operation of the inductive power supply 10.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of an amplitude curve of the induction coil 108 preset with an error range according to an embodiment of the present invention. As shown in FIG. 5, continuing the embodiment shown in FIG. 2, the induction coil 108 is also operated under the driving voltage S_DV, and the fixed operating frequency F2 has a sine wave amplitude A2 observed on the amplitude curve W0. Then, according to different user requirements or preset conditions of the inductive power supply 10, the amplitude curve W0 is shifted up or down to form another upper limit amplitude curve W0_U and another lower limit amplitude curve W0_D, respectively, and corresponds to a fixed operating frequency. F2 has an upper limit sine wave amplitude A2_U and a lower limit sine wave amplitude A2_D. In this case, the upper limit sine wave amplitude A2_U and the lower limit sine wave amplitude A2_D will correspond to an error range formed on the amplitude curve W0 at the fixed operating frequency F2, that is, the inductive power supply 10 can be operated in an inductive power transfer operation. Corresponding to whether the variation of the sine wave amplitude corresponding to the sensing coil 108 exceeds the error range, that is, whether the variation of the sine wave amplitude is greater than the upper limit sine wave amplitude A2_U or less than the lower limit sine wave amplitude A2_D to determine whether there is a metal foreign matter medium. Between the inductive power supply 10 and the rechargeable product of the power receiving end, it is used as a judging mechanism for whether to continue the inductive charging operation. Further, in this embodiment, the error range of the above-mentioned fixed amplitude curve W0 and fixed to the operating frequency F2 can be combined with the look-up table in the embodiment of FIG. 3, so as to be applicable to different amplitude curves, different operating frequencies, and different The stable voltage source can be corresponding to a plurality of error ranges, and can be stored in the non-volatile memory of the storage module 102 as a judging mechanism for whether the inductive charging operation is continued in the operation of the inductive power supply 10.

Referring to the embodiments described in FIG. 1 to FIG. 5, the inductive power supply 10 provided by the present invention stores the look-up table of FIG. 3 in combination with the embodiment of FIG. 5 in advance by the storage module 102. Forming an error range lookup table to obtain a plurality of error ranges under different amplitude curves, different operating frequencies and different stable voltage sources, thereby providing an initial state S_IS of the rechargeable product under a specific stable voltage source VS, and then transmitting The feedback module 110 detects the voltage of the resonant sine wave S_DV2 of the induction coil 108 as the feedback signal S_FB, and then compares the amplitude of the sine wave between the initial state S_IS and the feedback signal S_FB in the processing module 104, and further serves as an inductive Whether the power supply 10 performs a determination mechanism of the inductive power transfer operation.

Please refer to FIG. 6. FIG. 6 is a schematic diagram of another inductive power supply 60 according to an embodiment of the present invention. As shown in FIG. 6, the processing module 104 can be additionally coupled to a switching module. The group 600 and a prompt module 602, and the storage module 102 has stored a code CD, so that the processing module 104 executes the above code through a frequency conversion manner, corresponding to the initial state of the induction coil 108 of the inductive power supply 60. Operating the voltage data or the operating frequency and other related parameter values, and forming an initial lookup table including the initial state S_IS of the inductive power supply 60, and the frequency conversion method is disclosed in Taiwan Patent Publication No. TW 201123675 "High Power Wireless Inductive Power Supply" The invention is described in the patent specification of the power transmission method of the device, and will not be described herein. In addition, the storage module 102 further includes another code CD1, and the processing module 104 of the inductive power supply 60 executes the code CD1 to determine whether the current inductive power supply 60 is to be set. In the embodiment, the switching mechanism is pre-stored in the processing module 104 or the storage module 102 to perform a switching operation between the two in response to the control processing module 104. Of course, the switching mechanism can also receive a control signal (not shown) input by the user through a switching module 600, and switch the processing module 104 to determine whether to perform a setting operation or an inductive power transmission operator. It is also within the scope of the invention.

Further, the switching mechanism applicable to the inductive power supply 60 can be summarized as a switching process 70, as shown in FIG. The switching process 70 includes the following steps:

Step 700: Start.

Step 702: Switch the inductive power supply 60 between the set operation or the inductive power transfer operation according to the control signal of the switching module 600.

Step 704: When the inductive power supply 60 performs a setting operation, the processing module 104 executes the code CD1 to perform a first operation flow; When the inductive power supply 60 performs an inductive power transfer operation, the processing module 104 executes the program code CD1 to perform a second operational flow.

Step 706: End.

In addition, the details of the operation of the first operational flow 80 of step 704 can be referred to in FIG. The first operational flow 80 includes the following steps:

Step 800: Start.

Step 802: Perform a voltage dividing operation on the stable voltage source VS by using the resistors R1 and R2 to transmit the first partial voltage value after the voltage division to the processing module 104.

Step 804: The processing module 104 stores the first partial pressure value in the storage module 102, and uses the first partial pressure value as a data header to establish an error range lookup table.

Step 806: According to the first partial pressure value, the processing module 104 correspondingly sets a working frequency value to the highest operating frequency value of the inductive power supply 60.

Step 808: The driving module 106 receives the operating frequency value set by the processing module 104 to generate the driving voltage S_DV, and the first detecting unit 1110 converts the voltage value of the resonant sine wave S_DV2 into the feedback signal S_FB for storage. In the storage module 102.

Step 810: The processing module 104 determines whether the feedback signal S_FB exceeds the highest operating voltage value of the feedback module 110 according to the voltage value of the resonant sine wave S_DV2. If the highest operating voltage value of the feedback module 110 is exceeded (or equal), the processing module 104 restarts the operation of the switching process 70; The operating module 104 reduces the operating frequency value set by the current first partial voltage value to re-step 808.

Please refer to the switching process 70 and the first operation flow 80 at the same time, and the storage module 102 has stored an error range lookup table (ie, including the initial state S_IS of the inductive power supply 60). In step 802, when the inductive power supply 60 enters the setting operation, the resistors R1 and R2 of the input power module 100 perform a voltage dividing operation on the stable voltage source VS, and transmit the first partial voltage value after the voltage division. To the processing module 104. In the step 804, the first partial pressure value is transmitted from the processing module 104 to the storage module 102 for storage. In the embodiment, the storage module 102 is configured to establish the first partial pressure value as an error range. One of the data headers in the table for subsequent search. In step 806, the processing module 104 (or the control signal according to the switching module 600) is configured to set the operating frequency value of the first voltage dividing value to the current maximum operating frequency value of the inductive power supply 60 (or High working frequency value). In step 808, the processing module 104 transmits the set operating frequency value to the driving module 106, so that the driving module 106 outputs the driving voltage S_DV to drive the capacitor C and the induction coil 108 to generate the resonant sine wave S_DV2, and feedback. The first detection unit 1110 of the module 110 further converts the voltage value of the resonant sine wave S_DV2 to the feedback signal S_FB for transmission back to the processing module 104 and storage in the storage module 102. In step 810, the processing module 104 determines whether the feedback signal S_FB exceeds (or is equal to) the maximum operating voltage value of the feedback module 110 according to the voltage value of the resonant sine wave S_DV2, if the current voltage value exceeds (or equals) the feedback. The maximum operating voltage value of the module 110, the processing module 104 can pass through a stop signal (not shown). The current setting operation is performed, and the operation of the switching process 70 is returned; if the current voltage value does not exceed (ie, is lower than) the highest operating voltage value of the feedback module 110, the processing module 104 lowers the current first partial pressure value. The set operating frequency value is repeated and step 808 is repeated to record the voltage value of the resonant sine wave corresponding to the next frequency.

Therefore, after the storage of the plurality of data, the storage module 102 can accurately establish the amplitude curve of the current stable voltage source VS in addition to the initial state S_IS of the inductive power supply 60. A different stable voltage source VS can be further input to establish a plurality of amplitude curves in the error range lookup table. In other words, the user can obtain the vibrating wire voltage value corresponding to different frequencies and different stable voltage sources and the corresponding multiple error ranges (ie, establish a plurality of data headers and their data contents in the error range lookup table) At the same time, according to the user's needs, different parameter data can be newly added in the error range lookup table, thereby providing a modified initial state S_IS corresponding to the inductive power supply 60 of the rechargeable product under a specific stable voltage source VS. .

In addition, the details of the operation of the second operation flow 90 of step 704 can be referred to FIG. The second operational flow 90 includes the following steps:

Step 900: Start.

Step 902: Perform a voltage dividing operation on the stable voltage source VS by using the resistors R1 and R2 to transmit the second partial voltage value after the partial pressure to the processing module 104.

Step 904: The processing module 104 determines whether the second partial pressure value matches the plurality of data headers of the error range lookup table in the storage module 102. If not The processing module 104 restarts the operation of the switching process 70; if it matches, the processing module 104 proceeds to step 906.

Step 906: The driving module 106 receives the operating frequency value set by the processing module 104 to generate the driving voltage S_DV, and transmits the voltage value of the resonant sine wave S_DV2 to the processing module 104 by the first detecting unit 1110. The processing module 104 captures the resonant sine wave corresponding to the operating frequency in the storage module 102 according to the currently set operating frequency.

Step 908: The processing module 104 determines whether the amplitude of the sine wave amplitude between the resonant sine wave S_DV2 and the resonant sine wave corresponding to the operating frequency exceeds a preset error range. If the preset error range is not exceeded, the processing module 104 restarts the operation of the switching process 70; if the preset error range has been exceeded, the processing module 104 stops the inductive power transfer operation of the inductive power supply 60.

Step 910: End.

Please refer to the switching process 70 and the second operation flow 90 at the same time, and the storage module 102 already includes a modified error range lookup table. In step 902, when the inductive power supply 60 enters the inductive power transfer operation, the resistors R1 and R2 of the input power module 100 perform a voltage division operation on the stable voltage source VS, and a second partial voltage after the voltage division. The value is passed to the processing module 104. In step 904, the processing module 104 will initially determine whether the second partial pressure value matches the plurality of data headers of the error range lookup table. If the second partial pressure value does not match the plurality of data headers, the processing module 104 returns to the switching process 70. Step 702: If the second partial pressure value matches one of the plurality of data headers, the processing module 104 proceeds to step 906. In step 906, the driving module 106 receives the operating frequency value set by the processing module 104 to generate the driving voltage S_DV, and transmits the voltage value of the resonant sine wave S_DV2 to the processing module 104 by the first detecting unit 1110. The processing module 104 also captures the resonant sine wave corresponding to the operating frequency of the storage module 102 according to the currently set operating frequency, so as to perform subsequent comparison operations. In step 908, the processing module 104 determines whether the sine wave amplitude difference between the resonant sine wave S_DV2 and the resonant sine wave corresponding to the operating frequency exceeds a preset error range. If the sine wave amplitude difference between the two does not exceed the preset error range, the processing module 104 will return to step 702 of the switching process 70; if the sine wave amplitude difference between the two has exceeded the preset error range, The processing module 104 will generate another abort signal (not shown) to stop the inductive power supply 60 from continuing the inductive power transfer operation.

In addition, in step 908, when the processing module 104 determines that the inductive power supply 60 stops the inductive power transfer operation, the prompt module 602 will also generate a prompt signal (not shown), for example, The voice signal or an optical signal, etc., further informs the user that metal foreign matter may be present in the inductive power supply 60, or the operation mode of the inductive power supply 60 may be abnormal, and the user needs to perform a manual correction operation. . Of course, those skilled in the art can also modify or add other prompting mechanisms and corresponding circuit modules, so that the inductive power supply 60 can display the display mode through a display panel in addition to prompting the user. It is also within the scope of the invention to inform the user of the location of the inductive power supply 60 where an abnormality may occur or a component thereof. Of course, those with ordinary knowledge in the field can also be based on user needs. It is also within the scope of the invention to add other switching mechanisms (switching signals) to add different operational flows to the different operators before and after the first operational flow 80 and the second operational flow 90.

In this embodiment, the initial state S_IS prestored in the storage module 102 (ie, the user has previously stored relevant parameters in the storage module 102 to form an initial error range lookup table), and according to the switching module 600 The control signal is adaptively matched with the first operation flow 80. In the actual operation of the inductive power supply 60, a plurality of error ranges corresponding to different amplitude curves, different operating frequencies and different stable voltage sources are added, and the power receiving end is connected. Relevant settings (such as the change of the different capacitance matching curves of different induction coils), so that the user can obtain the relevant data of the actual measurement in the actual operation process, and then modify/add the initial error range lookup table (ie, the initial state S_IS) ) The content. Preferably, the embodiment provided by the present invention does not further limit the operation mechanism of the wireless signal transmission. Therefore, those skilled in the art can appropriately add other controls between the setting operation and the inductive power transmission operation according to different needs. The process/signal is corresponding to the determination of whether or not to perform wireless signal transmission, so that the inductive power supply 10, 60 can simultaneously perform the inductive power transmission operation and the wireless signal transmission.

In summary, the embodiment of the present invention provides an inductive power supply and a metal foreign matter detecting method thereof for detecting the presence or absence of metallic foreign matter in the simultaneous inductive power transfer operation. In other words, in this embodiment, the amplitude of the sine wave corresponding to the feedback signal and the amplitude of the sine wave amplitude corresponding to the amplitude of the sine wave corresponding to the initial state of the inductive power supply are determined, when the difference between the two has been Inductive power supply when the error range is exceeded The inductive power transmission operation will be suspended to avoid the possibility that foreign metal foreign matter may enter between the inductive power supply and the chargeable device of the power receiving end during the inductive power transmission operation, so that metal foreign matter can be prevented from overheating and there is a danger of danger.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

10, 60‧‧‧Inductive power supply

100‧‧‧Input power module

1000‧‧‧ receiving unit

102‧‧‧ storage module

104‧‧‧Processing module

106‧‧‧Drive Module

1060‧‧‧Drive unit

108‧‧‧Induction coil

110‧‧‧ Feedback Module

1110‧‧‧First detection unit

1112‧‧‧Second detection unit

600‧‧‧Switch Module

602‧‧‧ prompt module

70‧‧‧Switching process

700, 702, 704, 706, 800, 802, 804, 806, 808, 810, 900, 902, 904, 906, 908, 910 ‧ ‧ steps

80‧‧‧First operational procedure

90‧‧‧Second operational procedure

A1, A2, A3, A4, A2_H, A2_L‧‧‧ chord amplitude

Amax, A1max~A4max‧‧‧maximum sine wave amplitude

A2_D‧‧‧lower chord amplitude

A2_U‧‧‧Upper chord amplitude

CD, CD1‧‧‧ code

F0, F1, F2, F3, F4‧‧‧ working frequency

R1, R2‧‧‧ resistance

SW1, SW2‧‧‧ switch transistor

S_C‧‧‧ control signal

S_DV, V1~V4‧‧‧ drive voltage

S_DV2‧‧‧Resonant sine wave

S_FB, S_FB1‧‧‧ feedback signal

S_IS‧‧‧Initial state

VIN‧‧‧ input voltage

VS‧‧‧Stable voltage source

W0, W0_H, W0_L, W1~W4‧‧‧ amplitude curve

W0_D‧‧‧ lower limit amplitude curve

W0_U‧‧‧ upper limit amplitude curve

FIG. 1 is a schematic diagram of an inductive power supply according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing an amplitude curve corresponding to a capacitor and an induction coil according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing different amplitude curves of capacitors and induction coils generated under different stable voltage sources according to an embodiment of the invention.

FIG. 4 is a schematic diagram showing different amplitude curves generated when the equivalent capacitance value and the equivalent inductance value of the capacitor and the induction coil are changed according to the embodiment of the present invention.

FIG. 5 is a schematic diagram showing an amplitude curve of a capacitor and an induction coil preset with an error range according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of another inductive power supply according to an embodiment of the present invention.

FIG. 7 is a flowchart of a handover procedure according to Embodiment 1 of the present invention.

FIG. 8 is a flow chart of a first operational flow of the first embodiment of the present invention.

FIG. 9 is a flowchart of a second operation flow of Embodiment 1 of the present invention.

10‧‧‧Inductive power supply

100‧‧‧Input power module

1000‧‧‧ receiving unit

102‧‧‧ storage module

104‧‧‧Processing module

106‧‧‧Drive Module

1060‧‧‧Drive unit

108‧‧‧Induction coil

110‧‧‧ Feedback Module

1110‧‧‧First detection unit

1112‧‧‧Second detection unit

R1, R2‧‧‧ resistance

SW1, SW2‧‧‧ switch transistor

S_C‧‧‧ control signal

S_DV‧‧‧ drive voltage

S_DV2‧‧‧Resonant sine wave

S_FB, S_FB1‧‧‧ feedback signal

S_IS‧‧‧Initial state

VIN‧‧‧ input voltage

VS‧‧‧Stable voltage source

Claims (24)

An inductive power supply for performing an inductive power transmission operation and detecting the presence or absence of a metal foreign object, the inductive power supply comprising: an input power module for receiving a stable voltage source; and a storage module a processing module coupled to the input power module and the storage module for generating a control signal according to the preset data and a feedback signal; a driving module, The input power module and the processing module are configured to convert the stable voltage source to a driving voltage according to the control signal; and an induction coil coupled to the driving module for electrically transmitting the driving voltage And the feedback module is coupled to the induction coil for generating the feedback signal according to the driving voltage received by the induction coil; wherein the preset data is generated And performing the inductive power transmission operation by using an initial state of the inductive power supply and including a sine wave amplitude corresponding to the driving voltage in the initial state. If the metallic foreign matter exists, this will affect the amplitude of one sine-wave signal corresponding to the feedback, so that the processing module generates the control signal corresponds to, to stop the inductive power transfer operation. The inductive power supply of claim 1, wherein the induction coil is further coupled to a capacitor to include an equivalent capacitance value and an equivalent inductance value, and the initial state is based on the equivalent capacitance value and the same The effective inductance value forms an amplitude curve on a two-dimensional coordinate including a plurality of operating frequencies and a plurality of sine wave amplitudes, and the two One of the dimensional coordinates of the dimension is the plurality of operating frequencies and one of the two-dimensional coordinates is the plurality of chord amplitudes. The inductive power supply of claim 2, wherein, on the two-dimensional coordinate, when the driving voltage is increased, the amplitude curve is translated along the longitudinal axis and one of the amplitude curves has a maximum sine wave amplitude system. increase. The inductive power supply of claim 2, wherein when the equivalent capacitance value and the equivalent inductance value are increased, a amplitude of the sine wave corresponding to the amplitude curve is reduced at the fixed operating frequency, When the equivalent capacitance value is reduced from the equivalent inductance value, the amplitude of the sine wave corresponding to the amplitude curve increases at the fixed operating frequency. The inductive power supply of claim 2, wherein the sinusoidal amplitude of the feedback signal increases at each of the operating frequencies when the metallic foreign body is on a mapping plane of the induction coil. The inductive power supply of claim 5, wherein the storage module further includes a code for determining whether a difference between the amplitude of the sine wave of the feedback signal and the sine wave amplitude of the preset data is More than one error range. The inductive power supply of claim 6, wherein the storage module is configured to store a lookup table, and the lookup table includes the plurality of operations of the two-dimensional coordinate The frequency and the plurality of sinusoidal amplitudes and the error range corresponding to each of the plurality of operating frequencies and each of the plurality of sinusoidal amplitudes. The inductive power supply of claim 6, wherein the processing module is generated when a difference between the amplitude of the sine wave of the feedback signal and the amplitude of the sine wave of the predetermined data is greater than the error range A first abort signal causes the inductive power supply to stop the inductive power transfer operation. The inductive power supply device of claim 6, further comprising a prompting module, when a difference between the amplitude of the sine wave of the feedback signal and the amplitude of the sine wave of the preset data is greater than the error range The prompt module generates a prompt signal correspondingly. The inductive power supply of claim 1, further comprising a switching module for generating a switching signal for switching between the setting operation and the inductive power transfer operation. The inductive power supply of claim 10, wherein the storage module further comprises a code for comparing an operating voltage of the feedback signal with an operating voltage of the predetermined data. The inductive power supply of claim 11, wherein when the operating voltage of the feedback signal is greater than the operating voltage of the predetermined data, the processing module is A second abort signal is generated to end the setting mode. The inductive power supply of claim 1, wherein the storage module further comprises a non-volatile memory (NVRAM), corresponding to storing the preset data and another code, and the The code system controls the processing module to obtain the initial state of the inductive power supply through a frequency conversion method. The inductive power supply of claim 1, wherein the feedback module detects a change in the amplitude of a sine wave regardless of whether the induction coil is electrically coupled to the power receiving device, and causes the processing module to determine whether to perform The inductive charging operation. A method for an inductive power supply, the inductive power supply comprising a processing module, an inductive coil and a predetermined data for performing an inductive power transfer operation while detecting the inductive power supply Whether there is a metal foreign object, the method includes: switching the inductive power supply between a setting operation and an inductive power transmission operation according to a control signal; and when the inductive power supply performs the setting operation, The processing module performs a first operation process, and when the inductive power supply performs the setting operation, the processing module performs a second operation process; wherein the preset data is the inductive power supply An initial state of the device and forming an initial lookup table, the first operational flow modifying the inductive power supply The initial lookup table of the supplier forms a modified lookup table, and the second operation flow detects whether the metal foreign object is present in the inductive power supply according to the modified lookup table. The method of claim 15, wherein the first operational flow further comprises: performing a voltage dividing operation on a stable voltage source to generate a first partial pressure value; and preset the first partial pressure value as a data a header is added to the initial lookup table to form the modified lookup table; according to the first partial pressure value, setting a current operating frequency of the processing module to be one of the maximum operating frequencies of the inductive power supply Transmitting the operating frequency to a driving module to generate a driving voltage from the driving module to the induction coil, and converting a voltage signal of the induction coil to a feedback signal by a feedback module; and determining the sensing Whether the voltage signal of the coil exceeds a maximum working voltage of the feedback module, and if the voltage signal of the induction coil does not exceed the maximum operating voltage of the feedback module, reducing the current operating frequency set by the processing module Therefore, a plurality of data headers are added under different stable voltage sources to form the modified lookup table. The method of claim 16, wherein the second operation flow further comprises: performing the voltage dividing operation on the stable voltage source to generate a second partial pressure value; and determining whether the second partial pressure value meets the Modify one of the data headers in the lookup table to decide whether to continue the second operational flow. The method of claim 17, wherein the second operation flow further comprises: when determining to continue the second operation flow, the driving module generates the driving voltage according to the operating frequency of the current processing module. To the induction coil, the feedback module converts the current voltage signal of the induction coil to the processing module, and selects the current operating frequency of the processing module in the modified lookup table. a sine wave amplitude; and determining whether the feedback signal and a sine wave amplitude difference corresponding to the operating frequency exceed an error range, and when the sine wave amplitude difference exceeds the error range, the processing module determines The metal foreign matter is present in the inductive power supply, thereby stopping the inductive power transfer operation. The method of claim 18, further comprising utilizing a prompting module, wherein the prompting module generates a prompt signal correspondingly when the amplitude difference of the sine wave amplitude exceeds the error range. The method of claim 15, further comprising: generating a control signal by using a switching module to switch between the inductive power supply and the inductive power transfer operation. The method of claim 15, wherein the first operation flow and the second operation flow are further compiled into a code, correspondingly stored in a storage module, and processed by the processing The module executes the code to perform the first operation flow and the second operation flow. The method of claim 22, wherein the storage module further comprises a non-volatile memory (NVRAM) for storing the code, the initial lookup table, and the modified lookup table. The method of claim 15, wherein the processing module further executes another code to obtain the initial state of the inductive power supply through a frequency conversion manner and form the initial lookup table. The method of claim 15, wherein the processing module determines whether to perform the inductive method according to a change of a sine wave amplitude corresponding to the induction coil, whether the induction coil is electrically coupled to a power receiving device. Charging operation.