TW202111607A - Smart card and control method thereof - Google Patents

Abstract

The invention relates to a smart card and a control method thereof. The smart card includes a microprocessor, a biometric sensor, a power supply decision unit, and a power detection unit. When the power source supplies power to the smart card, the smart card runs at a lower operating frequency first. After determining by the power supply detecting unit and the power supply decision unit, it is determined whether a power source provides a higher current or voltage. The microprocessor further determines whether to change the operating frequency according to the determination. If so, the operating frequency is further increased to speed up the processing and thereby enhance the user experience.

Description

Smart card and its control method

The present invention relates to a smart card, especially a smart card capable of dynamically adjusting the operating frequency.

Many cards are used in people’s daily life. Traditional cards are only used as information recording interfaces, such as the user’s name, expiration date, etc. However, with the advancement of technology, cards are no longer traditional paper cards. By adding electronic recording media such as magnetic strips, barcodes, and chips, the cards can carry more information and reduce the probability of being forged, thereby increasing the card usage rate. However, with the popularity of cards, the phenomenon of fraudulent stealing and fraudulent use of other people’s cards has gradually appeared. At the same time, people will inevitably lose the card inadvertently. Therefore, the verification function of the card itself is also relatively important. In the prior art, A biometric sensor has been integrated on the card to provide users with identity verification when using the card.

When using a biometric sensor, it is necessary to supply power to the smart card to execute the processing procedure. In the prior art, the power supply mode is nothing more than contact power supply (for example, when the smart card is inserted into the card reader) and battery power supply (the smart card itself is built-in). Battery) or inductive power supply (the smart card uses non-contact induction to get power at the same time), but the current obtained by each method is very different. Taking contact power supply and inductive power supply as an example, contact power supply can provide no less than 7mA current, but the inductive power supply can only provide about 4mA current. The current size will affect the operating frequency of the smart card processor. The higher the current, the higher the operating frequency, but the smaller the current, the smaller the operating frequency. Due to the limitation of the power supply type It will be inductive power supply (low current), so the prior art smart card usually defaults to operate at a lower operating frequency, so as to avoid the situation where the power source cannot use the default operating frequency to operate when the power source is low current. As a result, it is accompanied by corresponding shortcomings. Even if the smart card of the prior art is powered by a larger current, it will still operate at a lower operating frequency. The lower operating frequency will result in a slower processing speed. Therefore, for users, The slower processing speed will always be felt, which will affect the user experience.

In view of this, the present invention enables the smart card to have the type of changing the working frequency to improve the user experience.

In order to achieve the aforementioned purpose of the invention, the present invention provides a smart card, which includes a microprocessor, a biometric sensor, a power supply decision unit and a power detection unit, the biometric sensor and the microprocessor Connected; the power supply decision unit is electrically connected to the microprocessor; the power supply detection unit is electrically connected to the power supply decision unit; wherein, when the microprocessor receives power, the microprocessor operates at a first operating frequency And the power supply detection unit detects the type of power supply to the microprocessor, and transmits the detection result to the power supply decision unit, and then the power supply decision unit determines whether the microprocessor changes the first operating frequency.

On the other hand, the present invention also provides a method for controlling a smart card, wherein the smart card includes a microprocessor and a biometric sensor. The method includes the following steps: the microprocessor operates at a first operating frequency and determines The type of power source supplied to the microprocessor, and the determination of whether the microprocessor changes the first operating frequency according to the aforementioned judgment result.

The advantage of the present invention is that the method of detecting the power supply type is used to determine whether to change the operating frequency of the microprocessor. Therefore, when a larger current power supply is obtained, the operating frequency of the microprocessor can be correspondingly increased, thereby accelerating the processing speed. Allow users to get a better user experience under the premise of the system's permission.

In the following, in conjunction with the drawings and the embodiments of the present invention, the technical means adopted by the present invention to achieve the intended purpose of the invention are further described.

Please refer to FIG. 1, the smart card of the present invention includes a microprocessor 10, a biometric sensor 20, a power supply decision unit 30, a power supply detection unit 40 and a voltage stabilizing circuit 50.

The aforementioned microprocessor 10 is electrically connected to the biometric sensor 20, the power supply decision unit 30, and the voltage stabilizing circuit 50. The power supply detecting unit 40 is connected to the microprocessor 10 in series through the voltage stabilizing circuit 50. The power supply detection unit 40 further transmits a power supply type detection signal to the power supply decision unit 30 and the microprocessor 10.

The biometric sensor 20 is used to obtain the user's biometric information for the microprocessor 10 to further process or determine the user's identity. The biometric sensor 20 can be a fingerprint sensor, but is not limited to this. .

The location of the power supply decision unit 30 may be different. In one embodiment (as shown in FIG. 1 ), the power supply decision unit 30 is independent of the microprocessor 10 and is electrically connected to the microprocessor 10. In another embodiment (as shown in FIG. 2), the power supply decision unit 30A and the microprocessor 10A are jointly integrated in a circuit structure. The power supply decision unit 30 may include a circuit structure as shown in FIG. 3, which has a first comparator 31 and a second comparator 32, and compares the current or voltage detected by the power supply detection unit 40 with the After comparing a first reference value REF1 stored in the first comparator 31 with a second reference value REF2 stored in the second comparator 32, the comparison result is output to a judgment module 33 to determine whether Change the operating frequency. Alternatively, the power supply decision unit 30 does not need to be provided with the judgment module 33, and the comparison result can be directly output to the microprocessor 10 to perform judgment to determine whether to change the operating frequency.

Please refer to FIG. 4, in an embodiment, the power supply detection unit 40A includes a power management unit 41A and a security element 42A (security element, SE), the security element 42A is mainly used to store the secret of the smart card News. In one embodiment, the secure element 42A and the power management unit 41A can be integrated into a circuit structure. The power management unit 41 may include the circuit structure shown in FIG. 5, but is not limited thereto. The power management unit 41A may include a switching element 411A, a resistance element 412A, a capacitance element 413A, a sequential element 414A, and an analog The digital conversion circuit 415A controls the opening and closing of the switching element 411A through the sequential element 414A, so that the current input from the power supply source charges the capacitive element 413A, and detects the time or frequency change of charging by a fixed detection voltage, or The corresponding power supply mode is found by detecting the voltage by the analog-to-digital conversion circuit 415A at a fixed time. The circuit structure disclosed in FIG. 5 can also be provided in the microprocessor 10.

Furthermore, the aforementioned circuit structures of the power supply detection unit 40, the microprocessor 10, and the biometric sensor 20 can be integrated in different ways. In an embodiment (as shown in FIG. 6), the microprocessor 10, the security element 42A, and the biometric sensor 20 are separate and independent circuit structures; in an embodiment (as shown in FIG. 7), The microprocessor 10B and the security element 42B are jointly integrated in a single circuit architecture; in one embodiment (as shown in FIG. 8), the microprocessor 10C and the biometric sensor 20C are jointly integrated in a single circuit architecture In one embodiment (as shown in FIG. 9), the microprocessor 10D, the biometric sensor 20D, and the security element 42D are integrated into a single circuit architecture. There may also be different packaging methods in the packaging structure. Taking the microprocessor 10 and the biometric sensor 20 as an example, in one embodiment (as shown in FIG. 10), the microprocessor 10 and the biometric sensor The sensors 20 are arranged side by side on the substrate 100, and then the microprocessor 10 and the biometric sensor 20 are covered with a sealant 101, and finally a protective layer 102 is arranged on the top surface of the sealant 101; In one embodiment (as shown in FIG. 11), the microprocessor 10 and the biometric sensor 20 are stacked packages, the microprocessor 10 is disposed on the substrate 100, and the biometric sensor 20 is stacked on This is on the processor 10 and separated by an insulator (such as DAF "Chip Adhesive Film") 103, and then the microprocessor 10 and the biometric sensor 20 are covered with a sealant 101, and finally on the A protective layer 102 is provided on the top surface of the sealing compound 101.

The various power supply sources described below are examples, not limited to this. Please refer to FIG. 4. In one embodiment, the power supply source 60A includes a contact power supply 61A and a proximity induction power supply 62A. Please refer to FIG. 6, the power supply source 60B includes a contact power supply 61B, a proximity induction power supply 62B, and a battery power supply 63B. The contact power supply 61A, 61B and the battery power supply 63B supply power to the power management unit 41A, and the proximity induction power supply 62B can supply power to the power management unit 41A or the safety element 42A. In one embodiment, the contact power supply 61A, 61B and the battery power supply 63B can also supply power to the safety element 42A.

The contact power supply 61A, 61B refers to the power supply generated when the smart card is inserted into the card reader and the physical contacts in the card reader are electrically connected to the physical contacts on the smart card. The proximity induction power supply 62A, 62B means that when the smart card is close to the card reader, induced current is generated by inductive power supply methods such as inductive coupling or electric field coupling to supply power to the smart card. The battery power supply 63B refers to the built-in battery of the smart card for power supply. Generally speaking, the contact power supply 61A, 61B provides an average current of about 7.4mA, and the voltage value is about 5V; the proximity induction power supply 62A, 62B provides an average of about 4.2mA current, and the voltage value is 2 to 12V; the battery The power supply 63B provides an average current of about 6.5mA, and the voltage value is 3.7 to 4.2V. Therefore, in terms of current, the contact power supply 61A, 61B can provide the largest current, followed by the battery power supply 63B, and the smallest is the proximity induction power supply 62A, 62B. Therefore, the type of power supply can be determined by the magnitude of the current. Since the contact power supply 61A, 61B provides a larger current, it can supply the microprocessor 10 to operate at a higher operating frequency, and because the proximity induction power supply 62A, 62B provides a smaller current, it can only supply The microprocessor 10 operates at another lower operating frequency, and since the current provided by the battery power supply 63B is between the foregoing two operating frequencies, the microprocessor 10 can be supplied between the foregoing two operating frequencies Operates at another operating frequency.

In addition, in terms of voltage, the voltage provided by the contact power supply 61A, 61B and the battery power supply 63B is relatively stable, while the voltage provided by the proximity induction power supply 62A, 62B will fluctuate due to slight changes in distance. Taking the power supply period of 20ms (milliseconds) as an example, the voltage provided by the contact power supply 61A, 61B and the battery power supply 63B can climb to the target voltage value in a very short time, and the stable control is near the target voltage value, but The target voltage value of the battery power supply 63B is less than the target voltage value of the contact power supply 61A, 61B. In addition, the proximity induction power supply 62A, 62B will change its voltage value due to the distance between the smart card and the reader. Causes voltage changes, so the type of power supply can be judged by the slope of the voltage ramp, the voltage value change, and the target voltage value.

Please refer to Figures 12 and 13, the smart card of the present invention may further include an indicator unit 70, the indicator unit 70 is electrically connected to the microprocessor 10, the indicator unit 70 is disposed on the surface of the smart card, and The indicator unit 70 can be observed outside the smart card to indicate the current operating frequency. In one embodiment, the indicating unit 70 is an indicator light, which indicates the current operating frequency of the microprocessor 10 by means of brightness, color or flashing frequency, for example, the highest brightness indicates the highest operating frequency, and the medium brightness indicates the middle. Value of the operating frequency, and low brightness means the lowest operating frequency; or red means the highest operating frequency, yellow means the operating frequency of the intermediate value, and green means the lowest operating frequency; or the highest flashing frequency means the highest operating frequency, The middle flicker frequency indicates the working frequency of the middle value, and the lowest flicker frequency indicates the lowest working frequency.

Please refer to Figure 14 in conjunction with Figure 4, the smart card control method of the present invention includes the following steps:

Receiving power supply (S10): When the smart card is connected to or close to the power supply source 60A, the power supply source 60A provides current to the smart card, so that the smart card can start to operate.

Operate at a first operating frequency (S20): When the smart card receives current, the microprocessor 10 starts to operate at the first operating frequency. Since the smart card has just started to operate, the power supply source is not yet known Then, the first operating frequency is operated at a lower first operating frequency, and the operation of the first operating frequency can be provided regardless of the power supply source.

Detect the type of power supply supplied to the microprocessor 10 (S30): Since the current provided by the power source 60A passes through the power supply detection unit 40A and the power supply decision unit 30, the power supply detection unit 40A and the power supply decision unit 30 The unit 30 detects the power supply type of the power supply source 60A. In one embodiment, the aforementioned detection of the power supply type refers to the detection of the power supply source 60A, and the power supply source 60A can be determined by detecting the power supply path, the magnitude of the input current, or the magnitude of the input voltage, and the degree of voltage change. What is the type.

Determine whether the microprocessor 10 changes the first operating frequency according to the detection result of the foregoing steps (S40): The microprocessor 10 will determine whether to change the operating frequency according to the judgment of the power supply decision unit 30, if the detection As a result, when it is determined that the power supply source can provide a larger current, the microprocessor 10 changes the first operating frequency to a higher second operating frequency, wherein the second operating frequency is higher than the first operating frequency (S50 ), if the detection result of the foregoing steps determines that the current provided by the power source is relatively small, the operation at the first operating frequency is maintained (S60).

Furthermore, when the smart card is used abnormally and the microprocessor 10 is restarted or the power supply is cut off (S70), no matter what operating frequency it was previously operating at, it will go back to step S20 to resume the first operation. The frequency is operated to maintain the initial operating state smoothly, and then the following steps are performed in the same way.

Please refer to FIG. 15A and FIG. 6, taking the detection of the power supply path as an example, and the proximity induction power supply 62B via the secure element 42A as an example. The smart card control method of the present invention includes the aforementioned steps S10 and S20. Except for S70, the following steps are continued after step S20:

Detect the power supply path to the microprocessor 10 (S30A): Since the current provided by the power supply source 60B passes through the power supply detection unit 40A, the power supply detection unit 40A detects the power supply path of the power supply source 60B .

Determine whether the power supply path comes from the contact power supply 61B (S41A): Since the power management unit 41A can learn the source of the current through a first contact for supplying current when the current is obtained by having a physical circuit conduction, then this At this time, the power management unit 41A can determine whether the power supply type is contact power supply 61B, if yes, change to the higher second operating frequency (S51A), if not, proceed to the next step S42A.

Determine whether the power supply path comes from the proximity induction power supply 62B (S42A): As shown in Figure 6, since only the current of the proximity induction power supply 62B will pass through the safety element 42A, it is determined whether the received power supply comes from the safety element 42A It can be judged whether the power supply type at this time is the proximity induction power supply 62B. If it is, the first operating frequency (S60), which was originally low, is maintained; if not, the power supply type at this time is neither the contact power supply 61B nor the contact power supply 61B. If the proximity induction power supply 62B is not, the battery 63B must be supplied, so it is changed to a third operating frequency between the first operating frequency and the second operating frequency (S52A). Wherein, the aforementioned power management unit 41A can be connected to the first contact and the safety element 42A through a switch element, and polling is used to detect whether there is current passing through the first contact or the safety element 42A. judgment.

Please refer to FIG. 15B in conjunction with FIG. 6, taking detecting the power supply path as an example, and taking the proximity sensor power supply 62B through the power management unit 41A as an example. The smart card control method of the present invention includes the aforementioned steps S10, Except for S20 and S70, the following steps will be executed after step S20:

Detect the power supply path supplied to the microprocessor 10 (S30B): Since the current provided by the power supply source 60B passes through the power supply detection unit 40A, the power supply detection unit 40A detects the power supply path of the power supply source 60B .

Determine whether the power supply path comes from the contact power supply 61B (S41B): Since when the current is obtained by having a physical circuit conduction, the power management unit 41A can learn the source of the current through the aforementioned first contact where the current enters, then At this time, the power management unit 41A can determine whether the power supply type is contact power supply 61B, if it is, it changes to the higher second operating frequency (S51B), if not, it proceeds to the next step S42B.

Determine whether the power supply path is powered by the battery 63B (S42B): When the current is obtained by a physical circuit, the power management unit 41A can learn the source of the current through a second contact where the current enters, then At this time, the power management unit 41A can determine whether the power supply type is battery power supply 63B, and if so, change to the third operating frequency between the first operating frequency and the second operating frequency (S52B), if not , Maintain the original lower first operating frequency (S60). Wherein, the aforementioned power management unit 41A can be directly connected to the first contact and the second contact via a switch element or directly, and detect whether the first contact or the second contact has current passing through, thereby performing judgment.

Please refer to FIG. 15C in conjunction with FIG. 6. Taking the detection of the power supply voltage as an example, the smart card control method of the present invention includes the aforementioned steps S10, S20, and S70. After step S20, the following steps are successively performed:

Detect the power supply voltage supplied to the microprocessor 10 (S30B): Since the voltage value changes and target voltage values of different sources provided by the power supply source 60B are different, the voltage value changes and voltage values can be detected by Know the type of the power source 60B.

It is judged whether the voltage variation of the power supply is greater than a variation threshold within a preset time (S41C): if it is, the first operating frequency (S60) that was originally lower is maintained; if not, the next step S42C is entered. Since the contact power supply 61B and the battery power supply 63B are physical contacts, the supplied voltage will quickly climb to the target voltage value within the preset time (such as 20ms), and the stable control is near the target voltage value, but the close contact The inductive power supply 62B will continuously change the voltage value due to the change of the distance. Therefore, if the change is determined to be greater than the change threshold, it is determined that the power supply type is the proximity inductive power supply 63B and maintains the original The first operating frequency is lower.

Determine whether the voltage of the power supply is greater than a voltage threshold (S42C): If it is, it means that the power supply source that can provide a larger voltage is the contact power supply 61B when the voltage fluctuation is stable, so it is changed to a higher value. The second operating frequency (S51C), if not, means that when the voltage fluctuates stably, the power supply source that can provide a larger voltage is the battery 63B, so the microprocessor 10 is now The first operating frequency used is changed to the third operating frequency between the first operating frequency and the second operating frequency (S52C). As shown in the embodiment of FIG. 3, at this time, the first reference value REF1 stored in the first comparator 31 and the second reference value REF2 stored in the second comparator 32 can be the variation threshold value and the second reference value REF2, respectively. The voltage threshold. In one embodiment, when there are only two power supply sources, there is no step S41C or step S42C, and the judgment can be made only by the voltage variation or the magnitude of the voltage.

Please refer to FIG. 15D in conjunction with FIG. 6. Taking the detection of power supply current as an example, the smart card control method of the present invention includes the aforementioned steps S10, S20, and S70, followed by the following steps after step S20:

Detecting the power supply current supplied to the microprocessor 10 (S30D): Since the current provided by the power supply source 60B is different, the power supply source 60B can be known by detecting the current value.

Determine whether the current of the power supply is greater than a first current threshold (S41D): if yes, change to the higher second operating frequency (S51D); if not, proceed to the next step S42D.

Determine whether the current of the power supply is less than a second current threshold (S42D): if it is, the first operating frequency (S60) that was originally lower is maintained; if not, the current of the power supply type at this time is between the foregoing two Therefore, the first operating frequency currently used by the microprocessor 10 is changed to the third operating frequency between the first operating frequency and the second operating frequency (S52D). The second current threshold is smaller than the first current threshold. As shown in the embodiment of FIG. 3, at this time, the first reference value REF1 stored in the first comparator 31 and the second reference value REF2 stored in the second comparator 32 can be the first current thresholds respectively. Value and the second current threshold value. In one embodiment, if there are only two possibilities for power supply, there is no step S42D and a single current threshold value can be used to make the judgment.

Therefore, the present invention detects the power supply type to adjust the appropriate operating frequency according to the different power supply types, and the smart card can use a higher operating frequency under the appropriate power supply type to speed up the processing speed and enhance the user experience.

The above are only the embodiments of the present invention and do not limit the present invention in any form. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field, Without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make slight changes or modification into equivalent embodiments with equivalent changes, but any content that does not depart from the technical solution of the present invention is based on the technical essence of the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solutions of the present invention.

100: substrate 10, 10A, 10B, 10C, 10D: microprocessor 20, 20C, 20D biometric sensor 30, 30A: power supply decision unit 31: The first comparator 32: second comparator 33: Judgment module 40, 40A: power supply detection unit 41A: Power Management Unit 411A: Switching element 412A: Resistance element 413A: Capacitive element 414A: Sequential components 415A: Analog-to-digital conversion circuit 42A, 42B, 42D: safety element 50: Voltage stabilizing circuit 60, 60A, 60B: power source 61A, 61B: Contact power supply 62A, 62B: Proximity induction power supply 63B: battery powered 70: indicating unit 101: Sealing body 102: protective layer 103: Insulator

FIG. 1 is a block diagram of the first embodiment of the smart card of the present invention; 2 is a schematic block diagram of the second embodiment of the smart card of the present invention; 3 is a schematic diagram of the circuit structure of the power supply decision unit of the smart card of the present invention; 4 is a schematic block diagram of the third embodiment of the smart card of the present invention; 5 is a schematic diagram of a partial circuit structure of the power supply detection unit of the smart card of the present invention; 6 is a schematic block diagram of the fourth embodiment of the smart card of the present invention; FIG. 7 is a block diagram of the fifth embodiment of the smart card of the present invention; FIG. 8 is a schematic block diagram of the sixth embodiment of the smart card of the present invention; FIG. 9 is a block diagram of the seventh embodiment of the smart card of the present invention; 10 is a schematic diagram of the package structure of some components of the smart card of the present invention; 11 is a schematic diagram of another package structure of some components of the smart card of the present invention; Figure 12 is a schematic diagram of the appearance of the smart card of the present invention; FIG. 13 is a block diagram of the fifth embodiment of the smart card of the present invention; Figure 14 is a flowchart of the first embodiment of the control method of the present invention; 15A is a flowchart of the second embodiment of the control method of the present invention; 15B is a flowchart of the third embodiment of the control method of the present invention; 15C is a flowchart of the fourth embodiment of the control method of the present invention: Fig. 15D is a flowchart of the fifth embodiment of the control method of the present invention.

10: Microprocessor

20: Biometric sensor

30: Power supply decision unit

40: power supply detection unit

50: Voltage stabilizing circuit

60: Power source

Claims (24)

A smart card that includes: A microprocessor; A biometric sensor, which is electrically connected to the microprocessor; A power supply decision unit, which is electrically connected to the microprocessor; A power supply detection unit, which is electrically connected to the power supply decision unit; Wherein when the microprocessor operates at a first operating frequency, and the power detection unit detects the type of power supply to the microprocessor, and transmits a detection result to the power supply decision unit, and then the microprocessor Determine whether to change the first operating frequency according to the judgment of the power supply decision unit. The smart card according to claim 1, wherein the power supply decision unit and the microprocessor are jointly integrated in a circuit structure, or the power supply decision unit is connected in series between the microprocessor and the power detection unit. The smart card according to claim 1 or 2, wherein the biometric sensor is a fingerprint sensor, which is electrically connected to the microprocessor. The smart card according to claim 1 or 2, wherein the detecting the type of power supply to the microprocessor includes detecting the path of the power supply, the input voltage or the input current. The smart card according to claim 1 or 2, further comprising an indicating unit, which is electrically connected to the microprocessor and configured to be externally visible, to indicate the current operating frequency. The smart card according to claim 1 or 2, wherein the power supply detection unit includes a power management unit and a secure element, and the secure element is mainly used to store confidential information of the smart card. The smart card according to claim 6, wherein the secure element and the power management unit are jointly integrated in a circuit structure, or are jointly integrated with the microprocessor in a circuit structure. The smart card according to claim 1 or 2, wherein the microprocessor and the biometric sensor are jointly integrated in a single circuit structure. The smart card according to claim 6, wherein the microprocessor, the secure element, and the biometric sensor are integrated into a single circuit architecture. The smart card according to claim 1 or 2, wherein the microprocessor and the biometric sensor are arranged side by side on a substrate. The smart card according to claim 1 or 2, wherein the microprocessor and the biometric sensor are stacked on a substrate, and an insulator is provided between the microprocessor and the biometric sensor. A method for controlling a smart card, wherein the smart card includes a microprocessor and a biometric sensor, and the method includes the following steps: a. The microprocessor operates at a first operating frequency; b. Determine the type of power supply to the microprocessor; c. Determine whether the microprocessor changes the first operating frequency based on the aforementioned judgment result. The method for controlling a smart card according to claim 12, wherein in step b, detecting the type of power supply to the microprocessor is detecting the input source of the power supply. The smart card control method according to claim 13, wherein when it is detected that the power supply comes from a first contact, it is determined that the input source of the power supply is a first source; when it is detected that the power supply comes from A secure element determines that the input source of the power supply is a second source; the magnitude of the operating current provided by the first source is higher than that of the second source. The smart card control method according to claim 14, wherein when it is not detected that the power supply comes from the first contact or the secure element, it is determined that the input source of the power supply is a third source, and the first The working current provided by the three sources is between the first source and the second source. The smart card control method according to claim 13, wherein when it is detected that the power supply comes from a first contact, it is determined that the input source of the power supply is a first source; when it is detected that the power supply comes from A second contact, then it is determined that the power supply input source is a third source, if it is not detected that the power supply comes from the first contact or the second contact, then it is determined that the power supply input source is A second source; the magnitude of the working current provided by the first source is higher than the magnitude of the second source, and the magnitude of the working current provided by the third source is between the first source and the second source. The method for controlling a smart card according to claim 15 or 16, wherein in step c, when it is determined that the input source of the power supply is the first source, the microprocessor switches to a second operating frequency to operate and determine When the input source of the power supply is the second source, the microprocessor maintains the operation at the first operating frequency, wherein the second operating frequency is higher than the first operating frequency. The method for controlling a smart card according to claim 17, wherein in step c, when it is determined that the input source of the power supply is the third source, the microprocessor switches to a third operating frequency to operate, wherein the first The three working frequencies are between the first working frequency and the second working frequency. The method for controlling a smart card according to claim 12, wherein in step b, detecting the type of power supply to the microprocessor is detecting the voltage of the power supply. The smart card control method according to claim 19, wherein when it is determined that the variation of the detected voltage is greater than a variation threshold within a predetermined time, the microprocessor maintains the operation at the first operating frequency; When the variation of the detected voltage is less than the variation threshold within the preset time, and the detected voltage is greater than a voltage threshold, switch the microprocessor to operate at a fourth operating frequency; wherein The fourth operating frequency is higher than the first operating frequency. The control method for a smart card according to claim 20, wherein when the detected voltage change is less than the change threshold after the preset time, and the detected voltage is less than the voltage threshold, Switching the microprocessor to operate at a fifth operating frequency, the fifth operating frequency being between the first operating frequency and the fourth operating frequency. The method for controlling a smart card according to claim 12, wherein in step b, detecting the type of power supply to the microprocessor is detecting the current of the power supply. The method for controlling a smart card according to claim 22, wherein when the detected current value is greater than a first current threshold value, the microprocessor is switched to operate at a sixth operating frequency; When the current value is less than a second current threshold, the microprocessor maintains operation at the first operating frequency, wherein the first current threshold is greater than or equal to the second current threshold, and the sixth operating frequency is higher than the first operating frequency. A working frequency. The control method for a smart card according to claim 23, wherein the first current threshold is greater than the second current threshold, and when the detected current value is between the first current threshold and the second current threshold Between the values, the processor is operating at a seventh operating frequency, and the seventh operating frequency is between the first operating frequency and the sixth operating frequency.

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