CN113360959A

CN113360959A - Host system and electronic lock unlocking method thereof

Info

Publication number: CN113360959A
Application number: CN202010138216.XA
Authority: CN
Inventors: 叶世豪; 卢嘉謦
Original assignee: Nuvoton Technology Corp
Current assignee: Nuvoton Technology Corp
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2021-09-07

Abstract

The invention provides a host system and an electronic lock unlocking method thereof. In the host system, the enclosure has a side door. The electronic lock is used for locking the side door on the case. The system circuit board is configured in the case and coupled with the electronic lock, and the system circuit board is provided with a plurality of universal serial bus ports and a plurality of non-volatile memory circuits. Each USB port is electrically connected with a corresponding non-volatile memory circuit, and each non-volatile memory circuit is written with data by a trigger voltage from the corresponding USB port. When the system circuit board receives the trigger voltage, the system circuit board reads a plurality of data stored in the non-volatile memory circuits, and when the plurality of data is equal to a default password, an unlocking signal is output to the electronic lock to unlock the electronic lock.

Description

Host system and electronic lock unlocking method thereof

Technical Field

The present invention relates to a host system, and more particularly, to a host system using a non-volatile memory to input a password and an unlocking method of an electronic lock thereof.

Background

At present, in computer cases using electronic locks, most users can only input the electronic lock password through a Basic Input Output System (BIOS) when the computer is powered on, so as to set the electronic lock of the case to be opened or closed. If the computer is in a shutdown state or the host computer is in an abnormal condition, the user cannot enter the security system, that is, the user cannot open the security authentication mechanism, so that the electronic lock of the chassis cannot be opened.

Disclosure of Invention

The invention provides a host system and an electronic lock unlocking method thereof, which can enter a security authentication mechanism to unlock an electronic lock under the condition that the host system is not unlocked.

According to an embodiment, the present invention provides a host system, which includes a chassis, an electronic lock, and a system circuit board. The case has a side door. The electronic lock is arranged on the side door and used for locking the side door on the case. The system circuit board is configured in the case and coupled with the electronic lock, and the system circuit board is provided with a plurality of universal serial bus ports and a plurality of non-volatile memory circuits. Each USB port is electrically connected with the corresponding non-volatile memory circuit, and each non-volatile memory circuit is written with data by a trigger voltage from the corresponding USB port. When the system circuit board is not started and receives the trigger voltage, the system circuit board reads a plurality of data stored in the non-volatile memory circuits, and when the plurality of data is equal to a default password, an unlocking signal is output to the electronic lock to unlock the electronic lock.

Preferably, a power supply unit of the usb device provides the trigger voltage when the usb device is plugged into one of the usb ports.

Preferably, the system circuit board includes a control chip coupled to the usb port and the electronic lock, and the control chip uses the trigger voltage as an operating power to read a plurality of data stored in the plurality of non-volatile memory circuits, and compares the plurality of data with the default password, and when the plurality of data is equal to the default password, the control chip outputs an unlocking signal to the electronic lock to unlock the electronic lock.

Preferably, each of the nonvolatile memory circuits includes a write circuit and a nonvolatile memory, and the write circuit writes data into the volatile memory when the write circuit and the nonvolatile memory receive the trigger voltage.

Preferably, the nonvolatile memory is a resistive memory, and the write circuit changes the resistance of the resistive memory to write data.

Preferably, the control chip includes a reading unit and a comparing unit, the default password is a default input sequence, when the control chip receives the trigger voltage, the reading unit reads a plurality of data stored in the non-volatile memory to record an input sequence of the usb device inserted into the usb ports, the comparing unit compares the input sequence with the default input sequence, and when the input sequence is equal to the default input sequence, the control chip outputs the unlocking signal to the electronic lock to unlock the electronic lock.

Preferably, when the trigger voltage received by the control chip exceeds a default time or the trigger voltage is stable, the control chip is started, so that the reading unit reads a plurality of data stored in the non-volatile memory, the comparing unit compares the plurality of data with the default password, and when the input sequence is equal to the default password, the control chip outputs an unlocking signal to the electronic lock to unlock the electronic lock.

Preferably, the system circuit board further includes a dual power circuit coupled to the usb ports and the control chip for receiving an external power voltage of a usb device plugged into the usb ports and a standby power voltage of the system circuit board, and the dual power circuit provides the external power voltage to the control chip when the external power voltage is received and the standby power voltage is not received, and the dual power circuit provides the standby power voltage to the control chip when the standby power voltage is received regardless of whether the external power voltage is received.

According to an embodiment, the present invention provides a method for unlocking an electronic lock of a host system, comprising the following steps. When a system circuit board of a host system is not started, judging whether the system circuit board receives a trigger voltage; when the system circuit board is not started and receives trigger voltage, detecting an input sequence in which a plurality of universal serial bus ports are inserted through a control chip of the system circuit board; comparing the input sequence with a default input sequence through the control chip; when the input sequence is equal to the default input sequence, an unlocking signal is output to the electronic lock through the control chip so as to unlock the electronic lock.

According to an embodiment, the present invention provides an electronic lock system, which includes an electronic lock and a system circuit board. The system circuit board is coupled to the electronic lock and has a plurality of piezoelectric keys and a plurality of non-volatile memory circuits, wherein each of the plurality of piezoelectric keys is electrically connected to the corresponding non-volatile memory circuit. Each piezoelectric key generates a trigger voltage when being pressed, and each nonvolatile memory circuit writes data by the trigger voltage from the corresponding piezoelectric key. When the system circuit board is not started and receives the trigger voltage, the system circuit board reads a plurality of data stored in the non-volatile memory circuits, and when the plurality of data is equal to a default password, an unlocking signal is output to the electronic lock to unlock the electronic lock.

Preferably, the at least one plurality of piezoelectric keys comprises a component made of piezoelectric material, each of the nonvolatile memory circuits comprises a write circuit and a resistive memory, and when the write circuit and the resistive memory receive a trigger voltage, the write circuit changes the impedance of the resistive memory to write data.

Drawings

Fig. 1 is a schematic structural diagram of a host system according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a system circuit board according to an embodiment of the invention.

FIG. 3 is a diagram of a non-volatile memory circuit of a system circuit board according to an embodiment of the invention.

Fig. 4 is a flowchart of an electronic lock unlocking method according to an embodiment of the invention.

Fig. 5 is a flowchart of an electronic lock unlocking method according to another embodiment of the invention.

Fig. 6 is a schematic diagram of a system circuit board according to another embodiment of the invention.

Fig. 7 is a schematic diagram of a system circuit board according to another embodiment of the invention.

Reference numerals:

10: universal serial bus device

101: power supply unit

100: host system

110: cabinet

111: side door

120: electronic lock

130. 130a, 130b, 130 c: system circuit board

131: universal serial bus port

133: dual power supply circuit

135: control chip

1351: reading unit

1352: comparison unit

1353: default password

1354: reset unit

137: chip group

139: basic input/output system

14: non-volatile memory circuit

141: non-volatile memory

142: write circuit

71: piezoelectric key

72: memory circuit

73: control chip

CMD _ L: lock commands

CMD _ U: unlock command

SLK: locking signal

SUL: unlock signal

VBUS: voltage of external power supply

VSTB: standby power supply voltage

VPE: pressing voltage

S41-S47: step (ii) of

Detailed Description

The following detailed description of the embodiments of the present invention will be provided in conjunction with the drawings and examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present invention can be fully understood and implemented.

Fig. 1 is a schematic structural diagram of a host system according to an embodiment of the present invention. Referring to fig. 1, in the present embodiment, a host system 100 includes a chassis 110, an electronic lock 120, and a system circuit board 130. The cabinet 110 has a side door 111 that can be rotated to expose the inside of the cabinet 110. The electronic lock 120 is disposed on the side door 111 for locking the side door 111 on the chassis; that is, when the electronic lock 120 is in the unlocked state, the side door 111 can rotate freely, and when the electronic lock 120 is in the locked state, the side door 111 cannot rotate.

The system circuit board 130 is disposed in the chassis 110 and coupled to the electronic lock 120, and the system circuit board 130 has a plurality of usb ports 131. When the system circuit board 130 is not activated and receives a trigger voltage, the system circuit board 130 detects the input status of the usb ports 131. For example, when a power key (hereinafter, referred to as a usb device) is plugged into the usb port 131, the external power voltage provided by the power key can be regarded as a trigger voltage.

The system board 130 compares the input state with the default password. When the input state is equal to the default password, the system circuit board 130 outputs an unlocking signal SUL to the electronic lock 120 to unlock the electronic lock 120; when the input status is not equal to the default password, the system circuit board 130 does not output a signal to the electronic lock 120.

Please refer to fig. 2, which is a schematic diagram of a system circuit board according to an embodiment of the invention. As shown in fig. 1 and fig. 2, in the embodiment, the system circuit board 130a is a motherboard, but the embodiment of the invention is not limited thereto, and the same or similar components are denoted by the same or similar reference numerals. In addition to the USB port 131, the system circuit board 130a further includes a control chip 135, a chipset 137, a BIOS 139, and a plurality of nonvolatile memory circuits 14. For example, the control chip 135 may be a Super input/output (Super I/O) chip or an Embedded Controller (EC). The nonvolatile memory circuits 14 are electrically connected to the usb ports 131 one by one. The control chip 135 is electrically coupled between the usb ports 131, the chipset 137 and the electronic lock 120. The chipset 137 is coupled between the control chip 135 and the bios 139.

In an embodiment of the invention, when the system circuit board 130a is powered off, for example, the motherboard is in the state of G3, the system circuit board 130a will not provide any voltage to the control chip 135. The chipset 137 and the bios 139 are in an inactive state, i.e., in an inoperable state.

When the usb device 10 is plugged into a usb port 131, the usb device 10 may provide a trigger voltage to change the state of the corresponding non-volatile Memory circuit 14, for example, the non-volatile Memory circuit 14 may include Resistive Random Access Memory (RRAM), and the trigger voltage provided by the usb device 10 may change the impedance state of the RRAM, for example, from a low impedance state to a high impedance state; similarly, if the non-volatile memory circuit 14 comprises a Phase-change memory (PCM), the trigger voltage provided by the usb device 10 may change the Phase state of the PCM, thereby storing data.

The control chip 135 can read the data of all the non-volatile memory circuits 14 after being started, compare the data of all the non-volatile memory circuits 14 with a default password, and when the data are equal to the default password, the control chip 135 outputs an unlocking signal to the electronic lock 120 to unlock the electronic lock 120. In one embodiment, the control chip 135 may use the trigger voltage as an operation power source, and a power supply unit of the usb device provides the trigger voltage. The usb device may be a mobile power supply and/or transformer with usb plug, and the power supply unit is, for example, a battery or a mains voltage circuit.

Please refer to fig. 2 to 5, which are schematic diagrams of a system circuit board according to an embodiment of the present invention, a non-volatile memory circuit of the system circuit board according to an embodiment of the present invention, a flowchart of an electronic lock unlocking method according to an embodiment of the present invention, and a flowchart of an electronic lock unlocking method according to another embodiment of the present invention. As shown in fig. 3, each of the nonvolatile memory circuits 140 includes a nonvolatile memory 141 and a write circuit 142. The control chip 135 includes a reading unit 1351, a comparing unit 1352, a default password 1353, and a resetting unit 1354. Preferably, the nonvolatile memory 141 can be resistive memory, phase change memory, or other similar nonvolatile memory. The reset unit 1354 is electrically connected to all the nonvolatile memory circuits 14.

When the nonvolatile memory 141 is a resistive memory, the write circuit 142 may change the impedance of the resistive memory, for example, from low impedance to high impedance, when receiving the trigger voltage, thereby storing at least one bit of data; when the nonvolatile memory 141 is a phase change memory, the write circuit 142 may change the phase state of the resistive memory when receiving the trigger voltage, thereby storing at least one bit of data.

In the present invention, the non-volatile memory 141 is used to record whether the USB device 10 is plugged into the USB port 131. When the usb device 10 is plugged into the usb port 131, the external power voltage of a power supply unit 101 of the usb device 10 can be used as a trigger voltage to the non-volatile memory 141, the write circuit 142 and the control chip 135; therefore, after the controller 135 is activated, the reading unit 1351 can read the impedance of each nonvolatile memory 141, and if the nonvolatile memory 141 is in a high impedance state, it indicates that the usb device 10 has the usb port 131 corresponding to the nonvolatile memory 141 inserted therein. The manner in which the read unit 1351 reads the nonvolatile memory 141 can be implemented by various data reading manners, and two different data reading manners will be described below with reference to fig. 4 and 5.

The unlocking method of the electronic lock shown in fig. 4 includes steps S41 to S47, and is applicable to the system circuit board and the nonvolatile memory circuit shown in fig. 2 and 3. In step S41, one of the usb ports 131 is inserted using a usb device 10. For example, assume that there are 6 USB ports 131 (illustrated as A-F) on the system circuit board 130, which are electrically connected to a nonvolatile memory circuit 14. The usb device 10 is inserted into the usb port a, which is correspondingly connected to the non-volatile memory circuit 14A, and the non-volatile memory circuit 14A includes a write circuit 142A and a non-volatile memory 141A, and so on.

In step S42, the power supply unit 101 of the usb device 10 transmits a trigger voltage to the nonvolatile memory circuit 14A through the usb port a, so that the write circuit 142A of the nonvolatile memory circuit 14A can be activated by using the trigger voltage to change the impedance state of the nonvolatile memory 141A, for example, the nonvolatile memory 141A is initially in a low impedance state (which may represent that the data stored in the nonvolatile memory 141A is 0), and the write circuit 142A converts the nonvolatile memory 141A into a high impedance state (which may represent that the data stored in the nonvolatile memory 141A is 1).

In step S43, the trigger voltage is also transmitted to the control chip 135, so that the control chip 135 can be started using this trigger voltage. Next, in step S44, after the control chip 135 is activated, the reading unit 1351 reads the data in the nonvolatile memories 141A to 141F.

In step S45, the comparing unit 1352 compares the data in the non-volatile memories 141A to 141F with the default password 1353, and if the data in the non-volatile memories 141A to 141F matches the default password 1353, go to step S46; otherwise, returning to step S41, the usb device 10 is waited for to be inserted into one of the usb ports 131 again.

In this embodiment, since the control chip 135 is activated to read the data of the non-volatile memories 141A-141F each time the USB device 10 is plugged into the USB ports 131, the control chip 135 can record the sequence of the USB devices 10 plugged into the USB ports 131, so the default password 1353 can be a default input sequence; for example, the default input order may be "a", "C", and "E", i.e. the usb port 131 is inserted in the order of "a", "C", and "E"; alternatively, the default order may be "a", "F", "E", "D", "a"; alternatively, the default order may be "A", "FC", "D", "A", where "FC" represents two USB ports 131 being plugged simultaneously.

On the other hand, taking the default input order "a", "C", "E" as an example, when the usb ports 131 are inserted in the order of "a", "D", "E", they are regarded as different from the default order; when the usb ports 131 are inserted in the order of "C", "a", and "E", they are regarded as different from the default order; when the usb ports 131 are inserted in the order of "E", "D", "a", "C", "E", they are still considered to be different from the default order. That is, the system circuit board 130 only takes the most recently inserted portion of the number corresponding to the default order regardless of the older portion.

In one embodiment, the default password 1353 may be a default input combination, and the comparing unit 1352 determines whether the data combination of the nonvolatile memories 141A-141F is equal to the default input combination regardless of the input order. That is, taking the default input orders "a", "C", and "E" as an example, when the usb port 131 is inserted in the order of "C", "a", and "E", the comparing unit 1352 determines that the data in the non-volatile memories 141A-141F is equal to the default input combination; however, when the usb ports 131 are inserted in the order of "E", "D", "a", "C", and "E", they are still considered to be different from the default order.

In step S46, the control chip 135 outputs an unlocking signal SUL to the electronic lock 120 to unlock the electronic lock 120. In step 47, the reset unit 1354 resets the nonvolatile memory circuits 14A-141F, for example, the reset unit 1354 may reset all of the nonvolatile memories 141A-141F to a low impedance state.

In this embodiment, the user plugs the USB device 10 into and out of the USB ports A-F sequentially, and the control chip 135 is awakened each time the USB device 10 is plugged, so that the control chip 135 unlocks the electronic lock 120 if the input sequence or the input combination is equal to the default password 1353 after the user plugs the USB device 10 into and out of the last USB port.

The unlocking method of the electronic lock shown in fig. 5 includes steps S51 to S57, and is applicable to the system circuit board and the nonvolatile memory circuit shown in fig. 2 and 3.

In step S51, one of the usb ports 131 is inserted using a usb device 10. For example, assume that there are 6 USB ports 131 (illustrated as A-F) on the system circuit board 130, which are electrically connected to a nonvolatile memory circuit 14. The usb device 10 is inserted into the usb port a, which is correspondingly connected to the nonvolatile memory circuit 14A, and the nonvolatile memory circuit 14A includes a write circuit 142A and a nonvolatile memory 141A, and so on.

In step S52, the power supply unit 101 of the usb device 10 transmits a trigger voltage to the storage circuit 14A through the usb port a, so that the write circuit 142A of the storage circuit 14A can be activated by using the trigger voltage to change the impedance state of the nonvolatile memory 141A, for example, the nonvolatile memory 141A is initially in a low impedance state (which may represent that the data stored in the nonvolatile memory 141A is 0), and the write circuit 142A converts the nonvolatile memory 141A into a high impedance state (which may represent that the data stored in the nonvolatile memory 141A is 1).

In step S53, the control chip 135 determines whether the trigger voltage exceeds a predetermined time or whether the trigger voltage is stable, if yes, go to step S54; otherwise, return to step S51.

In step S54, the control chip 135 starts the operation by using the trigger voltage, and the read unit 1351 reads the data in the non-volatile memories 141A-141F. Through steps S53 and S54, after the user inserts the usb device 10 into the last usb port, the usb device 10 must be left in the usb port, and the control chip 135 will start up after receiving the stable trigger voltage; therefore, the operation of the control chip 135 of this embodiment is more stable than that of the previous embodiment, but the control chip 135 of this embodiment cannot record the sequence of inserting the USB device 10 into the USB ports 141A-141F, and the default password 1353 is preferably a default input combination, and the comparing unit 1352 determines whether the data combination of the non-volatile memories 141A-141F is equal to the default input combination regardless of the input sequence.

In step S55, the comparing unit 1352 compares the data in the non-volatile memories 141A to 141F with the default password 1353, and if the data in the non-volatile memories 141A to 141F matches the default password 1353, go to step S56; otherwise, step S57 is performed.

In step S56, the control chip 135 outputs an unlocking signal SUL to the electronic lock 120 to unlock the electronic lock 120; next, step 57 is performed. In step 57, the reset unit 1354 resets the nonvolatile memory circuits 14A-141F, for example, the reset unit 1354 may reset all of the nonvolatile memories 141A-141F to a low impedance state.

In this embodiment, the user plugs the usb device 10 into a plurality of usb ports a-F in sequence, and the start-up of the control chip 135 is not awakened each time the usb device 10 is plugged, so the user needs to leave the usb device 10 in the usb port after inserting the usb device 10 into the last usb port to start the control chip 135 for data reading and password determination. If the read data is equal to the default password 1353, the control chip 135 unlocks the electronic lock 120.

Please refer to fig. 6, which is a schematic diagram of a system circuit board according to another embodiment of the present invention. The difference between this embodiment and the previous embodiment is that the system circuit board 130b shown in fig. 6 further includes a dual power circuit 133 coupled between the usb ports 131 and the control chip 135 for receiving an external power voltage VBUS (i.e., trigger voltage) of a usb device 10 plugged into the usb ports 131 and a standby power voltage VSTB of the system circuit board 130. When receiving the external power voltage VBUS and not receiving the standby power voltage VSTB, the dual power supply circuit 133 provides the external power voltage VBUS to the control chip 135. When receiving the standby power voltage VSTB, the dual power supply circuit 133 supplies the standby power voltage VSTB to the control chip 135 regardless of whether the external power voltage VBUS is received.

In an embodiment of the present invention, when the system circuit board 130b is turned on, i.e. the host system is in a power-on state, the chipset 137 and the bios 139 are in a power-on state, i.e. in an operable state. If the user locks the electronic lock 120 through the man-machine interface provided by the bios 139, the chipset 137 is controlled by the bios 139 to provide a lock command to the control chip 135 to command the control chip 135 to provide the lock signal SLK to the electronic lock. On the contrary, if the user unlocks the electronic lock 120 through the man-machine interface provided by the bios 139, the chipset 137 is controlled by the bios 139 to provide an unlocking command to the control chip 135, so as to command the control chip 135 to provide the unlocking signal SUL to the electronic lock.

In this embodiment, if the system board 130 is in a standby state (e.g., S3/S5 state of the motherboard), the system board 130a provides the standby power voltage VSTB to the dual power supply circuit 133, and the control chip 135 can receive the standby power voltage VSTB through the dual power supply circuit 133 for operation, so that the control chip 135 can record the insertion sequence of the USB device 10 into the USB port, and the default password can include a default input sequence or a default input combination.

For example, when a power key having an external power supply voltage VBUS (the usb device 10 having the external power supply voltage VBUS is taken as an example herein) is inserted into one of the usb ports 131, the external power supply voltage VBUS is first transmitted to the dual power supply circuit 133 and the control chip 135, and the dual power supply circuit 133 receives the external power supply voltage VBUS and transmits the external power supply voltage VBUS as an operation power to the control chip 135. Also, the control chip 135 is triggered by the external power supply voltage VBUS directly received by the usb port 131 to execute a detection mechanism to detect the input sequence inserted into the usb port 131. The usb device 10 having the external power supply voltage VBUS is, for example, a mobile power supply and/or a transformer having a usb plug. The comparison operation of the control chip 135 in this embodiment is the same as that in the previous embodiment, and therefore, is not described herein again.

In an embodiment of the present invention, when the system circuit board 130a is turned on, i.e. the host system 100 is in a power-on state, the chipset 137 and the bios 139 are in a power-on state, i.e. in an operable state. If the user locks the electronic lock 120 through the man-machine interface provided by the bios 139, the chipset 137 may be controlled by the bios 139 to provide a lock command CMD _ L to the control chip 135 to command the control chip 135 to provide the lock signal SLK to the electronic lock. On the contrary, if the user unlocks the electronic lock 120 through the man-machine interface provided by the bios 139, the chipset 137 is controlled by the bios 139 to provide an unlocking command CMD _ U to the control chip 135, so as to command the control chip 135 to provide an unlocking signal SUL to the electronic lock.

In an embodiment of the present invention, the control chip 135 may have a mechanism for recording multiple consecutive errors of the unlocking procedure, and if the control chip 135 detects n consecutive insertions and the input sequence in the n insertions is not equal to the default sequence (n may be greater than or equal to 2, for example, but not limited thereto), the control chip 135 may lengthen the time interval between the locking and the unlocking (i.e. the time interval between the unlocking and the unlocking is entered), or the locking is no longer accepted (e.g. the original factory is returned to deconstruct the machine for unlocking). The mechanism for lengthening the time interval between lock-ins may be, for example, the control chip 135 may start "comparing the input sequence with the default sequence" at a longer interval, which may prevent the host system from being attacked by a brute force unlocking method. Where n may be associated with a default order, for example n may be m times the number of insertions in the default order, where m is greater than or equal to 2.

Please refer to fig. 7, which is a schematic diagram of a system circuit board according to another embodiment of the present invention. As shown in fig. 7, the electronic lock system includes an electronic lock 120 and a system circuit board 130. The electronic lock 120 may be disposed on a door. The system circuit board 130 is disposed on the electronic lock 120, the system circuit board 130 includes a control chip 73, a plurality of piezoelectric keys 71, and a plurality of non-volatile memory circuits 14, and each piezoelectric key 71 is electrically connected to a corresponding non-volatile memory circuit 14. The piezoelectric key 71 may include a component made of a piezoelectric material, and when the piezoelectric key 71 is pressed by an external force, the piezoelectric material is deformed by the pressure, so that the piezoelectric key 71 may generate a trigger voltage. In this embodiment, the trigger voltage can be used to write data into the nonvolatile memory circuit 14 and also used to activate the control chip 73.

When the piezoelectric key 71 is pressed to generate a trigger voltage, each nonvolatile memory circuit 14 can write data by the trigger voltage from the corresponding piezoelectric key 71. When the system circuit board 130 is not activated and receives the trigger voltage, the control chip 73 of the system circuit board 130 reads a plurality of data stored in the nonvolatile memory circuits 14, and outputs an unlocking signal SUL to the electronic lock 120 to unlock the electronic lock 120 when the plurality of data is equal to the default password.

In one embodiment, the piezoelectric key may include a component made of piezoelectric material, and the non-volatile memory circuit may include a write circuit and a resistive memory, and when the write circuit and the resistive memory receive the trigger voltage, the write circuit changes the impedance of the resistive memory to write data.

In the present embodiment, the implementation of writing data into the nonvolatile memory circuits, reading a plurality of data stored in the nonvolatile memory circuits 14, and comparing the plurality of data with the default password by using the trigger voltage is the same as the previous embodiment, and therefore, the detailed description thereof is omitted here.

Although the present invention has been described with reference to the foregoing embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A host system, comprising:

a cabinet having a side door;

an electronic lock, disposed on the side door, for locking the side door on the case; and

a system circuit board, configured in the case and coupled to the electronic lock, the system circuit board having a plurality of usb ports and a plurality of non-volatile memory circuits, wherein each of the plurality of usb ports is electrically connected to the corresponding non-volatile memory circuit, and each of the non-volatile memory circuits is written with data by a trigger voltage from the corresponding usb port;

when the system circuit board is not started and receives the trigger voltage, the system circuit board reads a plurality of data stored in the nonvolatile memory circuits, and outputs an unlocking signal to the electronic lock to unlock the electronic lock when the plurality of data is equal to a default password.

2. The host system of claim 1, wherein a power unit of a USB device provides the trigger voltage when the USB device is plugged into one of the USB ports.

3. The host system of claim 2, wherein the system circuit board comprises a control chip coupled to the usb ports and the electronic lock, and the control chip uses the trigger voltage as an operating power to read the data stored in the nonvolatile memory circuits and compare the data with the default password, and when the data is equal to the default password, the control chip outputs the unlock signal to the electronic lock to unlock the electronic lock.

4. The host system of claim 3, wherein each of the plurality of non-volatile storage circuits comprises a write circuit and a non-volatile memory, the write circuit writing data to the non-volatile memory when the write circuit and the non-volatile memory receive the trigger voltage.

5. The host system of claim 4, wherein the non-volatile memory is a resistive memory, and the write circuit changes the resistance of the resistive memory to write data.

6. The host system of claim 4, wherein the control chip comprises a reading unit and a comparing unit, the default password is a default input sequence, when the control chip receives the trigger voltage, the reading unit reads a plurality of data stored in the nonvolatile memories to record an input sequence of the USB device inserted into the USB ports, the comparing unit compares the input sequence with the default input sequence, and when the input sequence is equal to the default input sequence, the control chip outputs the unlock signal to the electronic lock to unlock the electronic lock.

7. The host system of claim 6, wherein when the control chip receives the trigger voltage for a predetermined time or until the trigger voltage is stable, the control chip is enabled to read the plurality of data stored in the plurality of non-volatile memories, the comparing unit compares the plurality of data with the predetermined password, and when the input sequence equals the predetermined password, the control chip outputs the unlock signal to the electronic lock to unlock the electronic lock.

8. The host system of claim 3, wherein the system circuit board further comprises a dual power circuit coupled to the USB ports and the control chip for receiving an external power voltage of a USB device plugged into the USB ports and a standby power voltage of the system circuit board, and the dual power circuit provides the external power voltage to the control chip when the external power voltage is received and the standby power voltage is not received, and the dual power circuit provides the standby power voltage to the control chip when the standby power voltage is received regardless of whether the external power voltage is received.

9. An electronic lock unlocking method for a host system, comprising:

when a system circuit board of a host system is not started, judging whether the system circuit board receives a trigger voltage;

when the system circuit board is not started and receives the trigger voltage, detecting an input sequence in which a plurality of universal serial bus ports are inserted through a control chip of the system circuit board;

comparing the input sequence with a default input sequence through the control chip; and

when the input sequence is equal to the default input sequence, an unlocking signal is output to the electronic lock through the control chip so as to unlock the electronic lock.

10. An electronic lock system, comprising:

an electronic lock; and

a system circuit board coupled to the electronic lock, the system circuit board having at least one piezoelectric key and a plurality of non-volatile memory circuits, wherein each piezoelectric key is electrically connected to the corresponding non-volatile memory circuit, and each non-volatile memory circuit generates a trigger voltage when pressed, and each non-volatile memory circuit writes data by the trigger voltage from the corresponding piezoelectric key;

11. The electronic lock system as recited in claim 10, wherein the at least one plurality of piezoelectric keys comprises a component made of piezoelectric material, each of the plurality of non-volatile memory circuits comprises a write circuit and a resistive memory, the write circuit changing an impedance of the resistive memory to write data when the write circuit and the resistive memory receive the trigger voltage.