TWI663806B - Supplying-end module of induction type power supply system and signal detection method using the same - Google Patents

Supplying-end module of induction type power supply system and signal detection method using the same

Info

Publication number
TWI663806B
TWI663806B TW107105016A TW107105016A TWI663806B TW I663806 B TWI663806 B TW I663806B TW 107105016 A TW107105016 A TW 107105016A TW 107105016 A TW107105016 A TW 107105016A TW I663806 B TWI663806 B TW I663806B
Authority
TW
Taiwan
Prior art keywords
power supply
coil
signal
supply coil
driving device
Prior art date
Application number
TW107105016A
Other languages
Chinese (zh)
Other versions
TW201820745A (en
Inventor
蔡明球
詹其哲
Original Assignee
富達通科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富達通科技股份有限公司 filed Critical 富達通科技股份有限公司
Priority to TW107105016A priority Critical patent/TWI663806B/en
Publication of TW201820745A publication Critical patent/TW201820745A/en
Priority claimed from US16/028,397 external-priority patent/US20180316227A1/en
Priority claimed from US16/124,211 external-priority patent/US20190020222A1/en
Priority claimed from US16/132,464 external-priority patent/US20190027971A1/en
Publication of TWI663806B publication Critical patent/TWI663806B/en
Application granted granted Critical

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0701Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
    • G06K19/0715Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management the arrangement including means to regulate power transfer to the integrated circuit
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type

Abstract

A power supply module is provided for an inductive power supply system, the power supply module includes a power supply coil, a first driving device, a second driving device and a signal detecting module. The first driving device is coupled to the power supply coil for driving the power supply coil to transmit power. The second driving device is coupled to the power supply coil for controlling the power supply coil to output a detection signal. The signal detecting module is coupled to the power feeding coil for detecting a reflected signal corresponding to one of the detecting signals.

Description

Power supply module of inductive power supply system and signal detecting method thereof

The invention relates to a power supply module of an inductive power supply system and a signal detecting method thereof, and more particularly to a method for detecting a smart card of a power supply module of an inductive power supply system.

In the inductive power supply, the power supply end drives the power supply coil to generate resonance through the driving circuit, and then emits radio frequency electromagnetic waves, and then receives electromagnetic wave energy through the coil of the power receiving end to perform electrical conversion to generate a DC power supply to the power receiving end device. If the electromagnetic energy transmitted by the power supply coil is applied to the metal body, it will have a heating effect, and the accumulated heat may cause the metal body to burn and cause harm. In the prior art, the inductive power supply has included a technology for detecting metal objects, which can effectively detect metal objects that may be affected by electromagnetic energy and generate heat, and interrupt the energy transmission after the metal object is found for protection. .

Smart cards have been used extensively in daily life, such as near field communication (Near Field) Communication, NFC), Radio Frequency Identification (RFID) or other similar technology to communicate, can capture tiny electromagnetic energy and then start the internal chip for data feedback transmission. This technology only needs to receive tiny electromagnetic energy to start, otherwise Excessive electromagnetic energy received by the smart card will damage the internal chip, and the inductive power supply may cause phase to this type of device. When the big hazard.

In other words, the electromagnetic energy transmitted by the inductive power supply is too powerful for the smart card, and the internal chip is often directly burned by the smart card. However, the electromagnetic energy that the smart card can receive is very small and cannot be recognized by the detection technology of the traditional inductive power supply. The only reliable way to do this is to set a corresponding card reading device on the transmitting coil of the inductive power supply. Before the power is transmitted, the card reading device determines whether the smart card exists. However, the provision of additional card reading devices requires additional cost, and a variety of different card reading devices are required for smart cards of various specifications. In addition to increasing the cost, the card reading coils also greatly increase the size of the device. In view of this, the prior art has been improved.

Therefore, the main object of the present invention is to provide a smart card detection method for a power supply module of an inductive power supply system, which can output a detection signal for a smart card through a power supply coil of an inductive power supply system. To achieve smart card detection while improving the above problems.

The invention provides a power supply module for an inductive power supply system. The power supply module includes a power supply coil, a first driving device, a second driving device and a signal detecting module. The first driving device is coupled to the power supply coil for driving the power supply coil to transmit power. The second driving device is coupled to the power supply coil for controlling the power supply coil to output a detection signal. The signal detecting module is coupled to the power feeding coil for detecting a reflected signal corresponding to one of the detecting signals.

The invention further discloses a signal detecting method for a power supply module of an inductive power supply system, the power supply module comprising a power supply coil. The signal detecting method includes stopping driving by a first driving device to control the power supply coil to suspend output power; and suspending output of the power supply coil During the power period, the power supply coil is driven to resonate through a second driving device; detecting a coil signal of the power supply coil to obtain a peak voltage level of the coil signal; setting a reference voltage to the peak voltage level Subtracting a preset voltage; the second driving device stops driving the power supply coil and restarts driving the power supply coil for a certain number of times to output a detection signal; and after outputting the detection signal, comparing the reference voltage with The coil signal is used to determine whether a reflected signal corresponding to one of the detection signals is received.

100, 400, 500‧‧‧ Inductive power supply system

1‧‧‧Power supply module

10‧‧‧Power supply

11‧‧‧ Processor

12‧‧‧ Clock generation module

121, 421‧‧‧ clock generator

13‧‧‧Power supply unit

43‧‧‧High frequency drive

14, 141, 451, 452 ‧ ‧ resonant capacitor

15‧‧‧Power supply coil

16‧‧‧Signal Detection Module

17‧‧‧ Comparator

18‧‧‧Digital Analog Converter

160‧‧‧voltage circuit

161, 162‧‧ ‧ voltage divider resistor

19‧‧‧ prompt device

44‧‧‧Switch Module

441, 442, 443‧‧ ‧ switch

152‧‧‧Inductance

Vc‧‧‧ coil signal

2‧‧‧Power receiving module

21‧‧‧Load unit

22‧‧‧Power coil

3‧‧‧Smart Card

31‧‧‧ coil

32‧‧‧ integrated circuit

20‧‧‧Signal detection process

200~214‧‧‧Steps

V1‧‧‧peak voltage level

V2‧‧‧ reference voltage

Sdet‧‧‧ detection signal

Sref‧‧·reflection signal

R1‧‧‧ resistance

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

FIG. 2 is a schematic diagram of a signal detection process according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of waveforms for transmitting a detection signal and detecting a corresponding reflected signal according to an embodiment of the present invention.

4 and 5 are respectively schematic views of another inductive power supply system according to an embodiment of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of an inductive power supply system 100 according to an embodiment of the present invention. As shown in FIG. 1 , the inductive power supply system 100 includes a power supply module 1 and a power receiving module 2 . The power supply module 1 can receive power from a power supply 10. The power supply module 1 includes a processor 11, a clock generation module 12, a power supply driving device 13, resonant capacitors 14 and 451, a high frequency driving device 43, a switch module 44, a power supply coil 15, and a signal detector. The measuring module 16, a prompting device 19 and a voltage dividing circuit 160. The power supply coil 15 can be used to transmit electromagnetic energy to the power receiving module 2 for power supply. The resonant capacitor 14 is coupled to the power supply coil 15 and can be used to resonate with the power supply coil 14 during power supply. The power supply driving device 13 is coupled to the resonant capacitor 14 and the power supply coil 15 and is controllable by the processor 11 for transmitting a driving signal to drive the power feeding coil 15 to transmit power. The power supply driving device 13 can adopt a full bridge or a half bridge The driving method is not limited to the invention. In addition, in the power supply module 1, a magnetic conductor composed of a magnetic material can be selectively used to enhance the electromagnetic induction capability of the power supply coil 15 while avoiding electromagnetic energy affecting an object in a direction opposite to the non-inductive surface of the coil.

In the embodiment of the present invention, the power supply coil 15 can be used for smart card detection in addition to transmitting power. In detail, the high frequency driving device 43 is coupled to the power feeding coil 15 through the resonant capacitor 451, and can be used to control the power feeding coil 15 to output a detecting signal, which can be used to detect the presence of the smart card. The switch module 44 includes a switch 441 coupled between the high frequency driving device 43 and the resonant capacitor 451 for controlling the operation of the high frequency driving device 43. When the power supply coil 15 is to output power, the switch 441 can be controlled to be turned off; when the power supply coil 15 is to output a detection signal, the switch 441 can be controlled to be turned on, so that the high frequency driving device 43 can drive the power supply coil 15 to operate. In addition, the power supply driving device 13 can also be provided with a switch (not shown) to activate the power supply driving device 13 when outputting power, and turn off the power supply driving device 13 when the detection signal is output and control the power feeding coil 15 not to receive the high frequency driving device. One end of the 43 drive signal is coupled to the ground.

After the power supply coil 15 outputs the detection signal, the signal detection module 16 can detect a reflection signal corresponding to one of the detection signals. In an embodiment, the signal detecting module 16 can be configured by a comparator 17 and a digital to analog converter (DAC) 18 for tracking the peak value of the coil signal Vc of the power supply coil 15. According to the detection of reflected signals. The voltage dividing circuit 160 includes voltage dividing resistors 161 and 162, which can attenuate the coil signal Vc on the power feeding coil 15 and output it to the signal detecting module 16. In some embodiments, if the circuit such as the processor 11 and the signal detecting module 16 has sufficient withstand voltage, the voltage detecting circuit 16 can be directly received by the signal detecting module 16 to receive the coil signal on the power feeding coil 15. Vc.

In addition, the processor 11 can be configured to receive the detection result of the signal detection module 16 to determine whether the smart card exists, and thereby control the operation of the power supply driving device 13 and the power supply coil 15, such as controlling whether to output power. The processor 11 can be any type of processing device, such as a central processing unit (CPU), a microprocessor (Microprocessor), a microcontroller (Microcontroller Unit, MCU), and the like. The clock generation module 12 includes time-lapse generators 121 and 421 for outputting clock signals to the power supply driving device 13 and the high-frequency driving device 43, respectively. The clock generation module 12 can be implemented by a Pulse Width Modulation Generator (PWM generator) or other type of clock generator. The prompting device 19 can be selectively disposed in the power supply module 1 to generate a prompt signal to notify the user of the inductive power supply system 100 to remove the smart card when the processor 11 determines that the smart card is present. The prompting device 19 can notify the user by any means, such as displaying a light number, a buzzer, a speaker, or displaying through a screen. As for other possible components or modules, such as the power supply unit, the display unit, etc., which may be increased or decreased depending on the requirements of the system, it is not shown in the description of the embodiment.

Please continue to refer to Figure 1. The power receiving module 2 includes a load unit 21 and a power receiving coil 22. The power receiving coil 22 can be used to receive power from the power supply coil 15. The load unit 21 generally refers to internal components or modules of various power receiving coils 22, such as a voltage stabilizing circuit, a resonant capacitor, a rectifying circuit, a signal feedback circuit, a power receiving end processor, etc., and the above components or modules may be increased or decreased depending on system requirements. And should not be a limitation of the invention. In addition, a smart card 3 is not included in the inductive power supply system 100, but is shown in FIG. 1 , and the smart card 3 may be, for example, a smart card conforming to Near Field Communication (NFC) specifications, including a coil. 31 and an integrated circuit (IC) 32.

Please refer to FIG. 2, which is a schematic diagram of a signal detection process 20 according to an embodiment of the present invention. The signal detection process 20 can be used for a power supply module of an inductive power supply system (such as the power supply module 1 of the inductive power supply system 100 of FIG. 1), which includes the following steps: Step 200: Start.

Step 202: Stop driving by the power supply driving device 13 to control the power supply coil 15 to suspend outputting power.

Step 203: Engage the switch 441.

Step 204: While the power supply coil 15 suspends the output power, the power feeding coil 15 is driven by the high frequency driving device 43 to resonate.

Step 206: Detect the coil signal Vc of the power supply coil 15 to obtain a peak voltage level V1 of the coil signal Vc.

Step 208: Set a reference voltage V2 to the peak voltage level V1 minus a preset voltage.

Step 210: The high frequency driving device 43 stops driving the power supply coil 15 and restarts driving the power supply coil 15 for a certain number of times to output a detection signal Sdet.

Step 212: After outputting the detection signal Sdet, compare the reference voltage V2 with the coil signal Vc to determine whether a reflected signal Sref corresponding to the detection signal Sdet is received.

Step 213: The switch 441 is turned off.

Step 214: End.

According to the signal detection process 20, the transmission of the detection signal Sdet can be performed while the power supply coil 15 suspends the output power. Since both the power transmission and the detection signal output use the same power supply coil 15, the operation of the power transmission and the detection signal output needs to be performed in a time-sharing manner. In this example, the power supply driving device 13 can stop driving to control the power supply coil 15 to suspend the output power, and the power supply coil 15 is driven by the high frequency driving device 43 to resonate. In general, the energy output from the power supply coil 15 depends on factors such as the amplitude of the drive signal output by the driving device, the capacitance value of the resonant capacitor, the inductance value of the power supply coil 15, and the operating frequency. When the power supply driving device 13 drives the power supply coil 15 to output electric power, the output energy thereof is large, and therefore, the power supply drive The moving device 13 needs to output a large signal amplitude while using the resonant capacitor 14 having a large capacitance value, so that the power feeding coil 15 operates at a lower frequency. When the high frequency driving device 43 drives the power supply coil 15 to resonate, in the case where the same power supply coil 15 (having the same inductance value) is employed, the capacitance value of the resonance capacitance 451 is small (usually much smaller than the resonance capacitance 14), so that the power supply The coil 15 operates at a higher frequency while having a lower output signal amplitude that can be received by the smart card. In an embodiment, the driving capability of the high frequency driving device 43 may be reduced, or a resistance may be provided between the high frequency driving device 43 and the power feeding coil 15 to reduce the output signal amplitude of the power transmitting coil 15 driven by the high frequency driving device 43.

According to the specification of a general short-range communication interface (such as Near Field Communication (NFC)), the communication device is divided into a host end and a slave end, and the host end may be, for example, a card reader, and the slave end may be, for example, a smart card. The slave side usually uses a powerless mechanism, that is, there is no need to receive power during standby. The host can intermittently transmit signals. The signal has electromagnetic energy and has a specific frequency. When the slave is close to the host, if the received signal meets its identifiable frequency, it can be activated by the received signal energy. Operation. After the slave is enabled, the signal/data can be reflected on the coil carrier by load modulation techniques. In other words, the host device can transmit the signal by polling. When the slave receives the polling signal, the identifier can be fed back to the host at a specific time. In the case where the slave does not receive the polling signal, no action is taken.

In an embodiment, in order to detect the smart card of the near field communication specification, the power supply coil 15 can output the detection signal corresponding to the near field communication specification, and the high frequency driving device 43 needs to drive the power supply coil 15 to operate at the frequency of 13.56 MHz. . In contrast, when the power supply driving device 13 drives the power supply coil 15 to output electric power, its operating frequency is approximately 100 kHz. In this case, the capacitance value of the resonant capacitor 14 should be greater than the capacitance value of the resonant capacitor 451 to control the power supply coil 15 to operate at a suitable frequency.

In this example, the step of the high frequency driving means 43 driving the power supply coil 15 to output the detection signal can be performed while the power supply driving means 13 controls the power supply coil 15 to suspend the output power. In another embodiment, the step of outputting the detection signal may also be performed before the power supply coil 15 starts outputting power to determine whether the smart card exists before outputting the power.

Then, the power supply coil 15 can transmit a detection signal similar to the polling signal. Please refer to FIG. 3 , which is a schematic diagram of a waveform for transmitting a detection signal Sdet and detecting a corresponding reflected signal Sref according to an embodiment of the present invention. FIG. 3 is a diagram showing the waveform of the coil signal Vc of the power supply coil 15 (ie, the voltage signal between the power supply coil 15 and the resonant capacitor 14). The driving of the high frequency driving device 43 causes the coil signal Vc on the power supply coil 15 to oscillate. Next, the high frequency driving device 43 can intermittently stop driving the power supply coil 15 several times, that is, stop driving the power supply coil 15 and restart driving the power supply coil 15 for a certain number of times to control the power supply coil 15 to output the detection signal Sdet. This specific number of times is the number of times specified by the smart card related specifications, but should not be limited to this. At this time, if a smart card 3 is present near the power supply coil 15, the coil 31 of the smart card 3 can detect the detection signal Sdet and return the reflected signal Sref after a predetermined time, and the reflected signal Sref will be at the coil signal Vc. The amplitude is modulated such that a section of amplitude drop occurs on the coil signal Vc, as shown in FIG.

In order to detect the amplitude change on the coil signal Vc to determine the reflected signal Sref, before receiving the reflected signal Sref, the signal detecting module 16 can first obtain and track the peak voltage level V1 of the coil signal Vc, regarding the peak voltage The tracking method of the bit V1 is described in the Republic of China Patent No. I577108, and will not be described here. Then, the processor 11 can set the reference voltage V2 to the peak voltage level V1 minus a preset voltage. The preset voltage can be determined according to the specification of the smart card and the type of the reflected signal Sref. In an embodiment, if the smart card conforms to the near field communication specification, the feedback signal Sref is fed back by using a 10% amplitude modulation method, that is, the amplitude of the peak voltage of the reflected signal Sref on the coil signal Vc is approximately 10% of the amplitude. In this case, the preset voltage can be set to be close to but not exceeding one tenth of the amplitude of the high frequency driving device 43 driving the power supply coil 15 to resonate, that is, the height of the control reference voltage V2 is slightly higher than the resonant amplitude of 90. %, as shown in Figure 3. In this case, the processor 11 can control the digital analog converter 18 to output the reference voltage V2 to one of the comparators 17, and the other input of the comparator 17 receives the coil signal Vc to the coil signal Vc and the reference voltage. V2 compares and determines whether the reflected signal Sref is received.

It can be seen from the above that the signal detecting module of the present invention can be used in the same structure as the comparator module for detecting metal foreign objects in the Republic of China Patent No. I577108. In other words, the same circuit structure can be used for metal foreign object detection and smart card detection. Measurements can reduce additional circuit costs.

Further, when the reflected signal Sref appears, the comparator 17 of the signal detecting module 16 can detect that a peak voltage lower than the reference voltage V2 appears on the coil signal Vc, and can determine that the reflected signal Sref is received and related information is received. Transfer to the processor 11. The processor 11 further determines that the smart card 3 is present within the power supply range of the power supply coil 15. It should be noted that, according to the near field communication specification, the smart card 3 needs to respond to the reflected signal Sref 86 microseconds (μs) after receiving the detection signal Sdet. Therefore, the reference voltage V2 can be set to output the detection signal Sdet. It is completed within 86 microseconds to detect the reflected signal Sref.

In this case, if the smart card detection is performed while the power supply coil 15 is suspending the output power, when the smart card 3 is detected, the processor 11 can control the power supply coil 15 to completely stop transmitting power. If the smart card detection is performed before the power supply coil 15 has started to output power, when the smart card 3 is detected, the processor 11 can control the power supply coil 15 not to start transmitting power. In an embodiment, the processor 11 can control the prompting device 19 to generate a prompt signal to be provided to the user of the inductive power supply system 100. After the user removes the smart card, the power supply module 1 re-executes the step of detecting whether the smart card 3 exists, until it is determined that the smart card 3 is removed, and then starts transmitting power.

In addition, if the reflected signal Sref is not detected during a period of detection, the smart card 3 does not exist in the power supply range of the power supply coil 15. In this case, the processor 11 can control the power supply coil 15 to continue transmitting power through the power supply driving device 13, and can suspend the power supply again after the power is outputted for a period of time to perform the step of detecting the presence or absence of the smart card 3. Alternatively, after confirming that the smart card does not exist, the power supply module 1 can further perform other detections, such as metal foreign object detection, before transmitting the power.

It should be noted that the purpose of the present invention is to detect whether a smart card exists in the vicinity of the coil or in the power supply range of the coil through the coil of the inductive power supply to prevent the smart card from being burnt due to the electromagnetic energy output by the coil. Therefore, taking the power supply module 1 of FIG. 1 as an example, when the processor 11 determines that the reflected signal Sref is received, the power supply coil 15 can be controlled to stop the power output without subsequent decoding of the reflected signal Sref. In other words, unlike the conventional card reader, after receiving the information fed back by the smart card, it is necessary to decode to obtain the detailed information of the smart card. The present invention only needs to judge whether the smart card exists or not, and does not need to obtain the number, content or Other relevant information.

In addition, the power supply module and the signal detecting method of the present invention can be used not only for smart card detection in compliance with near field communication specifications, but also for other types of smart cards. Please refer to FIG. 4, which is a schematic diagram of another inductive power supply system 400 according to an embodiment of the present invention. The structure of the inductive power supply system 400 is similar to that of the inductive power supply system 100, so that signals or components having the same function are denoted by the same symbols. The main difference between the inductive power supply system 400 and the inductive power supply system 100 is that the power supply module 1 of the inductive power supply system 400 further includes a resonant capacitor 452 coupled between the power supply coil 15 and the high frequency driving device 43. And is controlled by another switch 442 in the switch module 44. In addition, in In the inductive power supply system 400, the power supply module 1 adopts a coil structure of the CLC, that is, one end of the power supply coil 15 is coupled to the resonant capacitor 14 and the other end is coupled to the other resonant capacitor 141, so that the power supply driving device 13 can pass through two. A resonant capacitor is driven. In addition, in the power supply module 1 of the inductive power supply system 400, the switch module 44 further includes a switch 443 coupled between one end of the power supply coil 15 and the ground. In this example, switches 441, 442, and 443 are all included in switch module 44, which can be implemented by a wafer. However, in other embodiments, each switch can also be set independently. In addition, a resistor R1 is disposed at the output end of the high frequency driving device 43 for reducing the output power of the high frequency driving device 43 to drive the power supply coil 15.

In the power supply module 1 of the inductive power supply system 400, the high frequency driving device 43 is coupled to the power supply coil 15 through the resonant capacitors 451 and 452, respectively, and the switch module 44 can select the conduction switch 441 or 442 to pass the resonant capacitor. 451 or 452 is resonant. Preferably, the resonant capacitors 451 and 452 have different capacitance values, so that the high frequency driving device 43 can generate different frequency resonances on the coil signal Vc through different resonant capacitors 451 and 452 to perform smart card detection on different frequency bands. Can be used for different types or smart cards with different specifications. In one embodiment, the switches 441 or 442 in the switch module 44 can be turned on at the same time such that the resonant capacitors 451 and 452 are connected in parallel to form another capacitance value, thereby producing another different resonant frequency. In addition, more than two capacitors may be disposed between the high frequency driving device 43 and the power feeding coil 15. The switch module 44 may control the high frequency driving device 43 to be coupled to the power feeding coil 15 through any one or more capacitors. To achieve more different frequencies of resonance on the coil signal Vc. The number and arrangement of the capacitors and their corresponding resonant frequencies can be determined according to various smart card specifications and detection requirements, which should not be a limitation of the present invention.

In another embodiment, in addition to the high frequency driving device 43, an additional one or more high frequency driving devices capable of outputting different detection signals may be disposed in the power supply module 1, and the high frequency driving devices may be in the coil. Different resonant frequencies are generated on the signal Vc to detect different types or wisdom with different specifications. card.

Please continue to refer to Figure 4. In the power supply module 1 of the inductive power supply system 400, during the output of the power supply coil 15, all the switches 441 and 442 for the high frequency driving device 43 can be disconnected to avoid the strong output of the power supply driving device 13. The drive signal is transmitted to the high frequency drive unit 43 to cause the high frequency drive unit 43 to be damaged. During the smart card detection, in addition to turning on the switches 441 and/or 442 for the high frequency driving device 43, the switch 443 can be controlled to be turned on, so that the other end of the power supply coil 15 is coupled to the ground as a resonance reference point. Similarly, in the power supply module 1 of Fig. 1, the power supply driving device 13 also has a switch connectable to the ground terminal, which can be turned on during the smart card detection.

Further, the capacitance for resonating with the high frequency driving device 43 can also be set by other means. For example, please refer to FIG. 5, which is a schematic diagram of another inductive power supply system 500 according to an embodiment of the present invention. The structure of the inductive power supply system 500 is similar to that of the inductive power supply system 100, so signals or components having the same function are denoted by the same symbols. The main difference between the inductive power supply system 500 and the inductive power supply system 100 is that the power supply module 1 of the inductive power supply system 500 further includes a resonant capacitor 141 coupled between the power supply coil 15 and the power supply driving device 13 . The resonant capacitor 141 and the power supply coil 15 and the resonant capacitor 14 form a coil structure of the CLC. In addition, in the power supply module 1 of the inductive power supply system 500, the resonant capacitor 451 for resonating with the high frequency drive device 43 is connected in parallel with the power supply coil 15, and the high frequency drive device 43 and the power supply coil 15 are An inductor 152 is additionally added (which can be implemented with a smaller coil).

In the power supply module 1 of the inductive power supply system 500, the resonant capacitors 14 and 141 and the power supply coil 15 constitute a lower frequency resonant circuit that resonates when the power supply driving device 13 is driven. The resonant capacitor 451 is connected to the power supply coil 15 and the inductor 152 to form a resonant circuit with a higher frequency, which can detect wisdom. During the card period, the high frequency resonance signal is generated by the driving of the high frequency driving device 43. Since the value of the resonant capacitor 451 is much smaller than the resonant capacitors 14 and 141, when the power supply driving device 13 pushes the CLC structure of the resonant capacitor 141, the power supply coil 15 and the resonant capacitor 14 to output power, the frequency is much lower than the resonance formed by the resonant capacitor 451. The loop, therefore, can ignore the effects of the resonant capacitor 451.

In summary, the present invention provides a signal detection method that can be used in an inductive power supply to detect the presence of a smart card in the coil power supply range of the inductive power supply to avoid the inductive power supply. Excessive energy output from the power supply coil causes the smart card to burn out. In an embodiment of the invention, power output and smart card detection can be implemented through the same coil and in a time sharing manner. The signal detection of the smart card can be performed during the period when the power supply coil suspends the output power. When the processor detects the reflected signal and judges that the smart card exists, the power supply coil can be controlled to stop transmitting power or not to start transmitting power, and the processor only It is necessary to judge whether the smart card exists or not, and it is not necessary to decode the reflected signal to obtain other information of the smart card. In addition, in the embodiment of the present invention, the power supply coil of the inductive power supply system can realize the function of transmitting power and detecting the smart card, thereby eliminating the need to additionally set the card reader, thereby saving the cost of the card reader setting, and simultaneously The user can set different numbers of capacitors with different values, and/or use a plurality of high frequency driving circuits corresponding to different resonant frequencies to detect on different frequency bands, so that the present invention can be applied to many different types of Smart card detection.

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.

Claims (20)

  1. A power supply module for an inductive power supply system, the power supply module includes: a power supply coil; a first driving device coupled to the power supply coil for driving the power supply coil to transmit power; The second driving device is coupled to the power supply coil for controlling the power supply coil to output a detection signal; and a signal detection module coupled to the power supply coil for detecting one of the detection signals Reflected signal.
  2. The power supply module of claim 1, further comprising: a first resonant capacitor coupled between the power supply coil and the first driving device; and a second resonant capacitor coupled to the power supply coil and Between the second driving devices; wherein a capacitance value of the first resonant capacitor is greater than a capacitance value of the second resonant capacitor.
  3. The power supply module of claim 1, further comprising a processor, wherein when the signal detecting module determines that the power supply coil receives the reflected signal, the processor determines that one of the power supply coils is within a power supply range There is a smart card.
  4. The power supply module of claim 3, wherein when the processor determines that the smart card exists in the power supply range of the power supply coil, the power supply coil is controlled to stop transmitting power or not to start transmitting power.
  5. The power supply module of claim 3, further comprising: a prompting device, configured to determine, by the processor, the power supply range of the power supply coil In the case of a smart card, a prompt signal is generated for the user of the inductive power supply system.
  6. The power supply module of claim 1, wherein the processor does not decode the reflected signal when the power supply coil receives the reflected signal.
  7. The power supply module of claim 1, wherein the signal detection module comprises: a digital to analog converter (DAC) for providing a reference voltage; and a comparator coupled to the The digital analog converter is configured to compare the reference voltage with a coil signal of the power supply coil to determine whether the reflected signal is received.
  8. The power supply module of claim 2, further comprising: at least one third resonant capacitor coupled between the power supply coil and the second driving device, wherein the capacitance values of the at least one third resonant capacitor are mutually Different from each other, and different from the capacitance value of the second resonant capacitor; and a switch module for controlling the second driving device to selectively connect at least one of the second resonant capacitor and the at least one third resonant capacitor To the power supply coil.
  9. The power supply module of claim 8, wherein the switch module further controls the power supply coil to be coupled to a ground.
  10. The power supply module of claim 1, wherein the second driving device stops driving the power supply coil and restarts driving the power supply coil to a number of times specified by a smart card specification to control the power supply coil to output the detection signal.
  11. The power supply module of claim 1, further comprising: at least one third driving device coupled to the power supply coil for controlling the power supply coil to output another detection signal; wherein the at least one third driving The frequency at which the device drives the power supply coil to resonate is different from each other, and is different from the frequency at which the second driving device drives the power supply coil to resonate.
  12. The power supply module of claim 1, further comprising: a resistor coupled between the power supply coil and the second driving device.
  13. The power supply module of claim 1, further comprising: a first resonant capacitor coupled between the power supply coil and the first driving device; and a second resonant capacitor coupled in parallel with the power supplying coil And an inductor coupled between the power supply coil and the second driving device.
  14. A signal detection method for a power supply module of an inductive power supply system, the power supply module includes a power supply coil, and the signal detection method includes: stopping driving through a first driving device to control the power supply The coil suspends output power; while the power supply coil suspends output power, the power supply coil is driven to resonate through a second driving device; and a coil signal of the power supply coil is detected to obtain a peak voltage level of the coil signal; Setting a reference voltage to the peak voltage level minus a preset voltage; the second driving device stops driving the power supply coil and restarts driving the power supply coil to a number of times specified by a smart card specification to output a detection Signal; and After outputting the detection signal, the reference voltage and the coil signal are compared to determine whether a reflection signal corresponding to one of the detection signals is received.
  15. The signal detecting method of claim 14, wherein the preset voltage has a size close to but not more than one tenth of a resonance amplitude of the resonance of the second driving device driving the power supply coil.
  16. The signal detecting method of claim 14, wherein after the detecting the signal, the reference voltage and the coil signal are compared to determine whether the reflected signal corresponding to the detecting signal is received: When a peak voltage of one of the coil signals is detected to be lower than the reference voltage during a period after the detection signal is output, it is determined that the reflected signal is received.
  17. The method for detecting a signal according to claim 14, further comprising: determining that a power supply range of the power supply coil is stored in a smart card when the reflected signal is received.
  18. The method for detecting a signal according to claim 17, further comprising: when determining that the smart card exists in the power supply range of the power supply coil, the power supply coil stops transmitting power or does not start transmitting power.
  19. The method for detecting a signal according to claim 17 further includes: when determining that the smart card exists in the power supply range of the power supply coil, generating a prompt signal for providing to a user of the inductive power supply system.
  20. The signal detecting method of claim 14, wherein the power supply module does not decode the reflected signal when the power transmitting coil receives the reflected signal.
TW107105016A 2018-02-12 2018-02-12 Supplying-end module of induction type power supply system and signal detection method using the same TWI663806B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW107105016A TWI663806B (en) 2018-02-12 2018-02-12 Supplying-end module of induction type power supply system and signal detection method using the same

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
TW107105016A TWI663806B (en) 2018-02-12 2018-02-12 Supplying-end module of induction type power supply system and signal detection method using the same
CN201810223784.2A CN108565976A (en) 2018-02-12 2018-03-19 The power supply module and its signal detection method of inductive power-supply supply system
US16/028,397 US20180316227A1 (en) 2011-02-01 2018-07-05 Supplying-end module of induction type power supply system and signal detection method thereof
US16/124,211 US20190020222A1 (en) 2011-02-01 2018-09-07 Power supply device of induction type power supply system and nfc device identification method of the same
US16/132,464 US20190027971A1 (en) 2011-02-01 2018-09-16 Power supply device of induction type power supply system and rf magnetic card identification method of the same

Publications (2)

Publication Number Publication Date
TW201820745A TW201820745A (en) 2018-06-01
TWI663806B true TWI663806B (en) 2019-06-21

Family

ID=63258103

Family Applications (1)

Application Number Title Priority Date Filing Date
TW107105016A TWI663806B (en) 2018-02-12 2018-02-12 Supplying-end module of induction type power supply system and signal detection method using the same

Country Status (2)

Country Link
CN (1) CN108565976A (en)
TW (1) TWI663806B (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102054057A (en) * 2009-11-09 2011-05-11 上海华虹Nec电子有限公司 Analog simulation method for RFID tag circuit
US20110241436A1 (en) * 2010-04-02 2011-10-06 Advantest Corporation Wireless power receiving apparatus and wireless power supply system
CN202404630U (en) * 2011-12-15 2012-08-29 中国银联股份有限公司 Receiving terminal component for near field communication and receiving equipment comprising same
US20150263531A1 (en) * 2012-09-14 2015-09-17 Sony Corporation Non-contact electric power feeding system, terminal device, non-contact electric power feeding device, and non-contact electric power feeding method
TWI577108B (en) * 2016-05-13 2017-04-01 富達通科技股份有限公司 Induction type power supply system and intruding metal detection method thereof
CN106571692A (en) * 2015-10-09 2017-04-19 纽艾吉科技有限公司 Wireless electric power receiving device and demodulation method therefor
JP6122402B2 (en) * 2014-08-05 2017-04-26 パナソニック株式会社 Power transmission device and wireless power transmission system
TWI596546B (en) * 2013-06-28 2017-08-21 微科電子有限公司 Rfid card learning apparatus, wearable produc and operating method thereof
TWI604678B (en) * 2016-09-07 2017-11-01 National Chi Nan Univ Radio transmission system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102054057A (en) * 2009-11-09 2011-05-11 上海华虹Nec电子有限公司 Analog simulation method for RFID tag circuit
US20110241436A1 (en) * 2010-04-02 2011-10-06 Advantest Corporation Wireless power receiving apparatus and wireless power supply system
CN202404630U (en) * 2011-12-15 2012-08-29 中国银联股份有限公司 Receiving terminal component for near field communication and receiving equipment comprising same
US20150263531A1 (en) * 2012-09-14 2015-09-17 Sony Corporation Non-contact electric power feeding system, terminal device, non-contact electric power feeding device, and non-contact electric power feeding method
TWI596546B (en) * 2013-06-28 2017-08-21 微科電子有限公司 Rfid card learning apparatus, wearable produc and operating method thereof
JP6122402B2 (en) * 2014-08-05 2017-04-26 パナソニック株式会社 Power transmission device and wireless power transmission system
CN106571692A (en) * 2015-10-09 2017-04-19 纽艾吉科技有限公司 Wireless electric power receiving device and demodulation method therefor
TWI577108B (en) * 2016-05-13 2017-04-01 富達通科技股份有限公司 Induction type power supply system and intruding metal detection method thereof
TWI604678B (en) * 2016-09-07 2017-11-01 National Chi Nan Univ Radio transmission system

Also Published As

Publication number Publication date
TW201820745A (en) 2018-06-01
CN108565976A (en) 2018-09-21

Similar Documents

Publication Publication Date Title
JP5341180B2 (en) Transmit power control for wireless charging system
US9014628B2 (en) Low power near-field communication devices
TWI459678B (en) Inductive power supply with device identification
CN101272063B (en) Noncontact power transmission device
US8004118B2 (en) Power transmission control device, power transmitting device, electronic instrument, and non-contact power transmission system
CN102239619B (en) Power Systems
JP3961291B2 (en) Wireless power transfer system with increased output voltage
CN101689765B (en) Inductive powering surface for powering portable devices
US6282407B1 (en) Active electrostatic transceiver and communicating system
US8198754B2 (en) Power transmission control device, power transmitting device, electronic instrument, and non-contact power transmission system
US20170237296A1 (en) System and method for power transfer
EP0867899B1 (en) Noncontacting power transfer apparatus
KR20150003408A (en) Non-contact electric power feeding system and metal foreign-object detection apparatus for non-contact electric power feeding system
CN104160300B (en) Metal detection method, metal detection device, the metal detection method of contactless power supply device and contactless power supply device
JP4766437B2 (en) Multi-mode tags and methods for making and using multi-mode tags
JP5670869B2 (en) Wireless power transmission system
CN101873014B (en) Non-contact power supply system
US20070086225A1 (en) System and method for powering a load
CN102055249B (en) Wireless power feeder, wireless power transmission system, and table and table lamp using the same
US8412963B2 (en) Power supplying and data transmitting method for induction type power supply system
EP0215244A2 (en) Inductive magnetic field generator
US8179089B2 (en) Power transmission control apparatus, power transmission apparatus, contactless power transmission system, and data determination method
TWI429165B (en) Method of data transmission in high power
KR20140053297A (en) Energy efficient inductive power transmission system and method
KR101592800B1 (en) Systems and methods for limiting voltage in wireless power receivers