Locking circuit and locking device for product trial period expiration locking

Abstract

The utility model is suitable for the field of locking equipment, and provides a locking circuit and locking equipment for product trial period expiration locking, the locking circuit comprises a power supply module, an MCU module, a timing module, a switch module and an indicating lamp module; the power supply module is used for supplying power; the MCU module is used for controlling the on-off of the switch module; the timing module is used for timing; the switch module is connected between the first circuit and the second circuit and is used for on-off control between the first circuit board and the second circuit so as to lock or unlock a product; and the indicating lamp module is used for displaying the locking indication state of the locking circuit locked by the product trial period due. According to the utility model, the problem that the development workload is increased due to the fact that the product needs to be locked every time the product is developed is solved.

Description

Technical Field

[0001] The utility model belongs to the field of locking devices, and in particular relates to a locking circuit and a locking device for locking a product when its trial period expires. Background Art

[0002] Industrial products are typically offered to users for a trial period before being sold. If the user does not purchase the product after the trial period expires, the product must be returned. In practice, without an expiration lockout feature, there's a risk that users will continue to use the product without returning it.

[0003] A common way to lock out a product upon expiration is through a product management platform. Industrial products often come with a product management platform or software that allows remote locking by product management personnel. After the trial period expires, the product can be locked remotely by the product management personnel or automatically at a time set by the software.

[0004] Currently, this approach requires adaptive settings for each product each time a product is developed, which has the problem of increasing development workload by requiring product-locked settings each time a product is developed. Utility Model Content

[0005] The purpose of the embodiment of the utility model is to provide a locking circuit for locking a product when a trial period expires, aiming to solve the problem of increased development workload due to the need to set a product lock each time a product is developed.

[0006] The embodiment of the utility model is implemented as follows: a locking circuit for locking a product when the trial period expires, the locking circuit for locking a product when the trial period expires comprises: a power module, an MCU module, a timing module, a switch module and an indicator light module;

[0007] The power supply module is connected to the MCU module, the timing module, and the switch module, and is used to provide power to the MCU module, the timing module, and the switch module;

[0008] The MCU module is connected to the timing module, the switch module, and the indicator light module, and is used to control the on and off of the switch module;

[0009] The timing module is used for timing;

[0010] The switch module is connected between the first circuit and the second circuit, and is used for on-off control between the first circuit board and the second circuit to lock or unlock the product;

[0011] The indicator light module is used to display the locking indication status of the locking circuit when the product trial period expires.

[0012] Preferably, the power module includes a power input interface PVDD, a chip U1, a chip U2 and a chip U3;

[0013] The positive electrode of the power input interface PVDD is connected to the Vin interface of the chip U1, and the negative electrode is connected to the ground line;

[0014] The Vout interface of the chip U1 is connected to the Vin interface of the chip U2, and the GND interface is connected to the ground line;

[0015] The Vout interface of the chip U2 is connected to the IN interface of the chip U3, and the GND interface is connected to the ground line;

[0016] The EN interface of the chip U3 is connected to the Vout interface of the chip U2, and the G interface is connected to the ground line.

[0017] Preferably, the MCU module includes a chip U10, a status display interface IND, a burning interface J1, a crystal oscillator Y1, a resistor R1 and a resistor R5;

[0018] The VCC interface of the chip U10 is connected to the Vout interface of the chip U2, the AVCC interface is connected to the Vout interface of the chip U2, the GND interface is connected to the ground line, the AGND interface is connected to the ground line, and the RESET interface is connected to the Vout interface of the chip U2 through the resistor R1;

[0019] The first interface of the status display interface IND is connected to the ground line, and the second interface is connected to the first IO interface of the chip U10 through the resistor R5;

[0020] The GND interface of the burning interface J1 is connected to the ground line, the VCC interface is connected to the Vout interface of the chip U2, the SCK interface is connected to the SCK interface of the chip U10, the nRST interface is connected to the RESET interface of the chip U10, the PDI interface is connected to the PDI interface of the chip U10, and the PDO interface is connected to the PDO interface of the chip U10;

[0021] One end of the crystal oscillator Y1 is connected to the XTAL1 interface of the chip U10, and the other end is connected to the XTAL2 of the chip U10.

[0022] Preferably, the timing module includes a chip U12, a crystal oscillator X2 and a battery BAT1;

[0023] The VCC2 interface of the chip U12 is connected to the Vout interface of the chip U2, the GND interface is connected to the ground line, the SCLK interface is connected to the CO1A interface of the chip U10, the I / O interface is connected to the CO1B interface of the chip U10, and the CE interface is connected to the CO1C interface of the chip U10;

[0024] One end of the crystal oscillator X2 is connected to the X1 interface of the chip U12, and the other end is connected to the X2 interface of the chip U2;

[0025] The positive electrode of the battery BAT1 is connected to the VCC1 interface of the chip U12, and the negative electrode is connected to the ground line.

[0026] Preferably, the switch module includes an input interface S3I, an output interface S3O and a chip U11;

[0027] The first interface of the input interface S3I is connected to the ground line, and the second interface is connected to the 3Y1 interface of the chip U11;

[0028] The first interface of the output interface S3O is connected to the ground line, and the second interface is connected to the 3Z interface of the chip U11;

[0029] The VCC interface of the chip U11 is connected to the Vout interface of the chip U2, the GND interface is connected to the ground line, the 3Y0 interface is connected to the second IO interface of the chip U10, and the S3 interface is connected to the third IO interface of the chip U10.

[0030] Preferably, the indicator light module includes a light emitting diode LED1, a light emitting diode LED2, a resistor R3 and a resistor R4;

[0031] The positive electrode of the light emitting diode LED1 is connected to the fourth IO interface of the chip U10, and the negative electrode is connected to the ground line through the resistor R3;

[0032] The positive electrode of the light emitting diode LED2 is connected to the fifth IO interface of the chip U10, and the negative electrode is connected to the ground line through the resistor R4.

[0033] Preferably, the locking circuit for locking the product upon expiration of the trial period further comprises a communication module;

[0034] The communication module is connected to the power module and the MCU module, and is used to update and set the trial period time of the locking circuit that is locked when the trial period of the product expires.

[0035] Preferably, the communication module includes a Bluetooth module BT and a light emitting diode LED3;

[0036] The VCC interface of the Bluetooth module BT is connected to the OUT interface of the chip U3, the GND interface is connected to the ground line, the RX interface is connected to the cathode of the light-emitting diode LED3, and the TX interface is connected to the RXD1 interface of the chip U10;

[0037] The positive electrode of the light emitting diode LED3 is connected to the TXD1 interface of the chip U10.

[0038] Another object of an embodiment of the present utility model is a locking device, the locking device comprising a housing and a locking circuit installed in the housing for locking a product upon expiration of a trial period as described above;

[0039] The locking circuit for locking the product when the trial period expires is connected between the first circuit and the second circuit, and is used for on-off control between the first circuit and the second circuit to lock or unlock the product.

[0040] The present invention provides a locking circuit for locking a product upon expiration of its trial period. The circuit uses an MCU module to send a switching signal to a switch module based on the timing of a timing module to control the on / off state of the switch module. Upon receiving the switching signal, the switch module switches between the input and output terminals of the switch module to control the on / off control between a first circuit and a second circuit, thereby locking or unlocking the product. This allows for hardware-based locking of the product upon expiration of the trial period, and can be used directly on all products without requiring adaptive configuration. This eliminates the need for increased development workload associated with custom product lock configurations each time a product is developed. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A three-dimensional structural diagram of a locking circuit for locking a product upon expiration of its trial period provided by an embodiment of the utility model;

[0042] Figure 2 A circuit diagram of a power module provided in an embodiment of the present utility model;

[0043] Figure 3 A circuit diagram of the MCU module provided in an embodiment of the present utility model;

[0044] Figure 4 A circuit diagram of a timing module provided in an embodiment of the present utility model;

[0045] Figure 5 A circuit diagram of a switch module provided in an embodiment of the present utility model;

[0046] Figure 6 A circuit diagram of an indicator light module provided in an embodiment of the present utility model;

[0047] Figure 7A circuit diagram of a communication module provided in an embodiment of the present utility model;

[0048] Figure 8 This is a schematic diagram of the connection between a locking device provided by an embodiment of the present utility model and other circuits. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0050] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0051] like Figure 1 FIG. 1 is a structural diagram of a locking circuit for locking a product after trial period expiration provided by an embodiment of the present invention. The locking circuit for locking a product after trial period expiration includes: a power supply module, an MCU module, a timing module, a switch module, and an indicator light module.

[0052] The power supply module is connected to the MCU module, the timing module, and the switch module, and is used to provide power to the MCU module, the timing module, and the switch module;

[0053] The MCU module is connected to the timing module, the switch module, and the indicator light module, and is used to control the on and off of the switch module;

[0054] The timing module is used for timing;

[0055] The switch module is connected between the first circuit and the second circuit, and is used for on-off control between the first circuit board and the second circuit to lock or unlock the product;

[0056] The indicator light module is used to display the locking indication status of the locking circuit when the product trial period expires.

[0057] In an embodiment of the present invention, the input of the power module is a DC voltage, and the output is also a DC voltage. The power module steps down the input DC voltage and then provides power to the MCU module and the timing module.

[0058] In the embodiment of the present invention, the MCU module can be replaced by a comparator. If a comparator is used instead of the MCU module, the indicator light module is not required. The indicator light module is only used to facilitate the display of the lock status of the lock circuit when the product trial period expires and does not involve the implementation of the lock function of the lock circuit when the product trial period expires. The input end of the comparator is connected to the output end of the timing module, and the output end is connected to the control end of the switch module.

[0059] In the embodiment of the present invention, the switch module is essentially a control switching circuit, that is, a circuit that receives a signal to switch functions, and can be replaced by a relay.

[0060] In an embodiment of the present invention, a locking circuit for locking a product upon expiration of its trial period is equivalent to a switch provided inside the product. When the switch is closed, the product can operate normally, and when the switch is open, the product stops operating.

[0061] In the embodiment of the present invention, the timing module may use a countdown method or a clock method to perform timing.

[0062] In an embodiment of the present invention, if the timing module uses a countdown method, for example, if the product's trial period is 30 days, the timing module begins counting down from the 30th day. After the countdown ends, the timing module sends a stop signal to the MCU module. After receiving the stop signal, the MCU module sends a switching signal to the switch module. After receiving the switching signal, the switch module switches the switch between the input and output ends of the switch module, disconnecting the input and output ends of the switch module, thereby locking the product. A time parameter is pre-set during the program burning process. The pre-set time parameter is essentially the trial period of the product's trial period. In this way, the MCU module sets the countdown time value of the timing module based on the pre-set time parameter. The MCU module does not need to know the time change process; it only needs to determine whether the stop signal has been received to control the switching of the switch module. The judgment condition for the timing module to send the stop signal can be from 0 to the pre-set time parameter or it can be the pre-set time parameter decreasing to 0, depending on the programming. The method of the pre-set time parameter decreasing to 0 is the preferred embodiment.

[0063] In an embodiment of the present invention, if the timing module uses a clock, the MCU module continuously obtains the current time of the timing module and determines the elapsed time based on the current time of the timing module. If the elapsed time is equal to a preset time parameter, the MCU module sends a switching signal to the switch module. After receiving the switching signal, the switch module switches the switch between the input and output terminals of the switch module, disconnecting the input and output terminals of the switch module, thereby locking the product. With this method, there is no need to set a specific countdown value for the timing module. Instead, the time data of the timing module is obtained and then judged. When the time interval reaches the preset time parameter, the switch module is controlled to be on and off.

[0064] In the embodiments of the present invention, the timing module's mode depends on the programming. Theoretically, only one mode can be selected: the timing module can only operate in either countdown mode or clock mode. Selecting the countdown mode reduces the amount of data processing required by the MCU module, so the countdown mode is the preferred embodiment.

[0065] In the embodiment of the present utility model, if a comparator is used instead of the MCU module, the timing module can only adopt a countdown method.

[0066] In the embodiment of the present invention, the preset time parameter is essentially the trial period of the product trial period.

[0067] In an embodiment of the present invention, the indicator light module includes a running light module and a locking light module. Before the product trial period expires, the light in the running light module is on. When the product trial period expires, the light in the locking light module is on.

[0068] In the embodiment of the present utility model, Figure 1 As shown, the switch module acts as a switch between the first circuit and the second circuit. When the switch module switches, the connection between the first circuit and the second circuit also switches, for example, from connected to disconnected. For example, if the first circuit is the power circuit of the product and the second circuit is the operating circuit of the product, disconnecting the first circuit and the second circuit is equivalent to cutting off the power supply to the product, and the product enters a locked state.

[0069] The locking circuit provided by the present invention, which locks a product upon trial expiration, uses an MCU module to send a switching signal to a switch module based on the timing status of a timing module to control the on / off state of the switch module. After receiving the switching signal, the switch module switches between the input and output terminals of the switch module to control the on / off state of the circuit electrically connected to the product trial expiration locking state, thereby controlling the locked state of the product. This allows for hardware-based locking of the product upon trial expiration, and can be used directly on all products without requiring adaptive configuration. This solves the problem of increased development workload associated with custom product lock configurations each time a product is developed.

[0070] like Figure 2 As shown in FIG. 1 , as a preferred embodiment of the present invention, the power module includes a power input interface PVDD, a chip U1 , a chip U2 and a chip U3 ;

[0071] The positive electrode of the power input interface PVDD is connected to the Vin interface of the chip U1, and the negative electrode is connected to the ground line;

[0072] The Vout interface of the chip U1 is connected to the Vin interface of the chip U2, and the GND interface is connected to the ground line;

[0073] The Vout interface of the chip U2 is connected to the IN interface of the chip U3, and the GND interface is connected to the ground line;

[0074] The EN interface of the chip U3 is connected to the Vout interface of the chip U2, and the G interface is connected to the ground line.

[0075] In this embodiment of the present invention, a diode D1 is also included. The cathode of diode D1 is connected to the positive terminal of the power input interface PVDD, and the cathode is connected to the ground line. Diode D1 has functions such as transient voltage suppression, directional voltage protection, and voltage noise filtering.

[0076] In the embodiment of the present utility model, Figure 2 As shown, the power input interface PVDD's 1 port is the negative pole, and the 2 port is the positive pole. A capacitor is set between the positive pole of the power input interface PVDD and the ground line. The capacitor's function is to filter and reduce power supply noise. The same applies to the capacitors set between the Vout interface of chip U1, the Vout interface of chip U2, and the OUT interface of chip U3 and the ground line.

[0077] In this embodiment of the present invention, the voltage inputted by the input interface PVDD is direct current (DC), typically 12 / 15V. Chip U1 is a first step-down chip, which reduces the input voltage to a first voltage, for example, 8V. Chip U2 is a second step-down chip, which reduces the first voltage to a second voltage required by the MCU module, timing module, and switch module. Chip U3 is a third step-down chip, which reduces the second voltage to a third voltage required by the communication module, for example, 3.3V.

[0078] like Figure 3 As shown in FIG. 1 , as a preferred embodiment of the present invention, the MCU module includes a chip U10, a status display interface IND, a burning interface J1, a crystal oscillator Y1, a resistor R1 and a resistor R5;

[0079] The VCC interface of the chip U10 is connected to the Vout interface of the chip U2, the AVCC interface is connected to the Vout interface of the chip U2, the GND interface is connected to the ground line, the AGND interface is connected to the ground line, and the RESET interface is connected to the Vout interface of the chip U2 through the resistor R1;

[0080] The first interface of the status display interface IND is connected to the ground line, and the second interface is connected to the first IO interface of the chip U10 through the resistor R5;

[0081] The GND interface of the burning interface J1 is connected to the ground line, the VCC interface is connected to the Vout interface of the chip U2, the SCK interface is connected to the SCK interface of the chip U10, the nRST interface is connected to the RESET interface of the chip U10, the PDI interface is connected to the PDI interface of the chip U10, and the PDO interface is connected to the PDO interface of the chip U10;

[0082] One end of the crystal oscillator Y1 is connected to the XTAL1 interface of the chip U10, and the other end is connected to the XTAL2 of the chip U10.

[0083] In the embodiment of the present utility model, the function of the burning interface J1 is to burn the program of the chip U10. Figure 3 As shown, interface 1 of the programming interface J1 is the GND interface, interface 2 is the VCC interface, interface 3 is the SCK interface, interface 4 is the nRST interface, interface 5 is the PDI interface, and interface 6 is the PDO interface.

[0084] In the embodiment of the present invention, the status display interface IND can be connected to an indicator light for observing whether the product trial period has expired. The on and off state of the indicator light is controlled by the high and low levels of the first IO interface of the chip U10.

[0085] In the embodiment of the present invention, the capacitors required for the operation of the chip U10 are also included.

[0086] like Figure 4 As shown, as a preferred embodiment of the present invention, the timing module includes a chip U12, a crystal oscillator X2 and a battery BAT1;

[0087] The VCC2 interface of the chip U12 is connected to the Vout interface of the chip U2, the GND interface is connected to the ground line, the SCLK interface is connected to the CO1A interface of the chip U10, the I / O interface is connected to the CO1B interface of the chip U10, and the CE interface is connected to the CO1C interface of the chip U10;

[0088] One end of the crystal oscillator X2 is connected to the X1 interface of the chip U12, and the other end is connected to the X2 interface of the chip U2;

[0089] The positive electrode of the battery BAT1 is connected to the VCC1 interface of the chip U12, and the negative electrode is connected to the ground line.

[0090] In the embodiment of the present invention, the battery BAT1 is a backup power source, which provides power to the chip U12 when there is no power output from the VCC2 interface of the chip U12.

[0091] In the embodiment of the present invention, the chip U12 is a real-time clock chip, such as DS1302, LK8563, PCF8563, etc.

[0092] In the embodiment of the present invention, the chip U12 and the chip U10 can perform data transmission via the SPI protocol, and perform data transmission via the SCLK interface, the I / O interface and the CE interface.

[0093] In an embodiment of the present invention, if the timing module uses a countdown method, the I / O interface of chip U12 will not send a stop signal to chip U10 before the product trial period expires. When the product trial period expires, the I / O interface of chip U12 sends a stop signal to chip U10. If the timing module uses a clock method, chip U12 sends time data to chip U10 via the SCLK interface and the I / O interface. Before the product trial period expires, the MCU module determines that the elapsed time has not reached the preset time parameter. When the product trial period expires, the MCU module determines that the elapsed time has exactly reached the preset time parameter.

[0094] In the embodiment of the present invention, the crystal oscillator X2 is used for internal timing of the chip U12.

[0095] like Figure 5 As shown, as a preferred embodiment of the present utility model, the switch module includes an input interface S3I, an output interface S3O and a chip U11;

[0096] The first interface of the input interface S3I is connected to the ground line, and the second interface is connected to the 3Y1 interface of the chip U11;

[0097] The first interface of the output interface S3O is connected to the ground line, and the second interface is connected to the 3Z interface of the chip U11;

[0098] The VCC interface of the chip U11 is connected to the Vout interface of the chip U2, the GND interface is connected to the ground line, the 3Y0 interface is connected to the second IO interface of the chip U10, and the S3 interface is connected to the third IO interface of the chip U10.

[0099] In the embodiment of the present invention, the chip U11 is an analog switch chip, such as 74HC4053D, SN74LVC1G3157DBVR, etc.

[0100] In an embodiment of the present utility model, the second interface of the input interface S3I is the input end of a locking circuit for locking a product when the trial period expires, and the second interface of the output interface S3O is the output end of a locking circuit for locking a product when the trial period expires. If the locking circuit for locking a product when the trial period expires is regarded as a switch set inside the product, then the second interface of the input interface S3I and the second interface of the output interface S3O are equivalent to the two ends of the switch set inside the product.

[0101] In an embodiment of the present invention, before the product trial period expires, the 3Y1 interface and the 3Z interface of the chip U11 are internally connected, so the second interface of the input interface S3I and the second interface of the output interface S3O are connected. If the locking circuit is regarded as a switch, it is in a closed state at this time, and the product can operate normally. When the product trial period expires, if the timing module adopts a countdown method, the I / O interface of the chip U12 sends a stop signal to the chip U10. After receiving the stop signal, the chip U10 sends a switching signal to the chip U11 through the third IO interface of the chip U10. If the timing module adopts a clock method, the third IO interface of the chip U10 directly sends a switching signal to the chip U11. After receiving the switching signal, the S3 interface of the chip U11 disconnects the connection between the 3Y1 interface and the 3Z interface and connects the 3Y0 interface and the 3Z interface, thereby disconnecting the second interface of the input interface S3I and the second interface of the output interface S3O, and locking the product.

[0102] In an embodiment of the present invention, assuming that the second interface of input interface S3I is at a high level, when the second interface of input interface S3I and the second interface of output interface S3O are disconnected, if the second interface of output interface S3O is in a suspended state, then the state of the second interface of output interface S3O cannot be determined. It may be at a high level, it may be at a low level, or it may switch between high and low levels continuously. In this way, it is impossible to achieve the locked state of the product. Therefore, it is necessary to give the second interface of output interface S3O a low level, so that the locked state of the product can be achieved. The implementation method is to disconnect the connection relationship between interface 3Y1 and interface 3Z, and then connect interface 3Y0 and interface 3Z. Since interface 3Y0 of chip U11 is connected to the second IO interface of chip U10, as long as the second IO interface of chip U10 outputs a low level, it will be sufficient. If the second interface of input interface S3I is at a low level, then the second IO interface of chip U10 outputs a high level.

[0103] like Figure 6 As shown, as a preferred embodiment of the present utility model, the indicator light module includes a light emitting diode LED1, a light emitting diode LED2, a resistor R3 and a resistor R4;

[0104] The positive electrode of the light emitting diode LED1 is connected to the fourth IO interface of the chip U10, and the negative electrode is connected to the ground line through the resistor R3;

[0105] The positive electrode of the light emitting diode LED2 is connected to the fifth IO interface of the chip U10, and the negative electrode is connected to the ground line through the resistor R4.

[0106] In this embodiment of the present invention, LED1 and resistor R3 form the operating light module, while LED2 and resistor R4 form the locking light module. Before the product trial period expires, LED1 illuminates, with the fourth IO interface of chip U10 at a high level and the fifth IO interface of chip U10 at a low level. After the product trial period expires, LED2 illuminates, with the fourth IO interface of chip U10 at a low level and the fifth IO interface of chip U10 at a high level. At most, only one of LED1 and LED2 can be illuminated at a time.

[0107] like Figure 1 As shown, as a preferred embodiment of the present utility model, the locking circuit for locking the product upon expiration of the trial period further includes a communication module;

[0108] The communication module is connected to the power module and the MCU module, and is used to update and set the operating time of the locking circuit that is locked when the product trial period expires.

[0109] In the embodiment of the present utility model, the running time of the locking circuit that locks the product when the trial period expires is the trial period of the product.

[0110] In an embodiment of the present utility model, the communication module can use a module with a Bluetooth function, or a module with other communication transmission functions. The communication module can be connected to a mobile terminal such as a mobile phone, and after the connection, the mobile terminal can update the trial period, for example, extending the trial period by 30 days. The setting method can be to install relevant software on the mobile device, input the specific value of the trial period to be extended on the installed software, and then send the specific value of the trial period to be extended to the communication module. The communication module sends the received specific value of the trial period to be extended to the MCU module. If the timing module adopts a countdown method, the MCU module updates the time parameters of the timing module according to the specific value of the trial period to be extended. If the timing module adopts a clock method, the MCU module does not need to set the timing module.

[0111] In the embodiment of the present invention, if the timing module adopts a countdown method, the time parameters of the timing module can be pre-set when burning the program, or can be updated and set by the mobile terminal through the communication module.

[0112] In an embodiment of the present invention, if the mobile terminal updates the trial period via the communication module, the trial period will be updated to the latest setting. For example, if the product trial period is 30 days and it needs to be extended by 15 days after expiration, the trial period can be set to 15 days via the communication module, that is, the time parameter of the timing module is updated, thereby achieving a short unlocking time. After 15 days, the product will be locked after the trial period expires. If the trial period is set very long via the communication module, it can be regarded as a permanent unlocking of the product, for example, setting the time parameter to 100 years.

[0113] In the embodiment of the present invention, the communication module may be connected to the timing module instead of the MCU module. For example, when a comparator is used instead of the MCU module, the communication module is connected to the timing module.

[0114] like Figure 7 As shown, as a preferred embodiment of the present utility model, the communication module includes a Bluetooth module BT and a light emitting diode LED3;

[0115] The VCC interface of the Bluetooth module BT is connected to the OUT interface of the chip U3, the GND interface is connected to the ground line, the RX interface is connected to the cathode of the light-emitting diode LED3, and the TX interface is connected to the RXD1 interface of the chip U10;

[0116] The positive electrode of the light emitting diode LED3 is connected to the TXD1 interface of the chip U10.

[0117] In the embodiment of the present utility model, Figure 7 As shown, the 1st interface of the Bluetooth module BT is the TX interface, the 2nd interface is the RX interface, the 3rd interface is the GND interface, and the 4th interface is the VCC interface.

[0118] In the embodiment of the present invention, when the Bluetooth module BT receives feedback data from the chip U10 , the light emitting diode LED3 lights up, which indicates that the Bluetooth module BT is communicating with the chip U10 .

[0119] In the embodiment of the present utility model, the Bluetooth communication BT transmits communication data with the chip U10 through the TX interface and the RX interface, that is, the time parameter set by the mobile terminal is transmitted to the chip U10 through the TX interface and the RX interface.

[0120] The embodiment of the present utility model also provides a locking device, comprising a housing and a locking circuit installed in the housing for locking a product upon expiration of its trial period as described above;

[0121] The locking circuit for locking the product when the trial period expires is connected between the first circuit and the second circuit, and is used for on-off control between the first circuit and the second circuit to lock or unlock the product.

[0122] In the embodiment of the present invention, the locking device is generally used as a locking module in conjunction with other circuits. Figure 8 As shown, A is the locking device. A acts as a switch between the first and second circuits. When the 3Y1 and 3Z interfaces of chip U11 of the switch module in A are connected, the first and second circuits are connected. When the 3Y0 and 3Z interfaces of chip U11 of the switch module in board A are connected, the first and second circuits are disconnected, equivalent to entering a locked state.

[0123] In one embodiment of the present invention, the MCU module sends a switching signal to the switch module based on the timing status of the timing module to control the on / off state of the switch module. After receiving the switching signal, the switch module switches between the input and output terminals of the switch module to control the on / off state of the board connected to the device, thereby controlling the product lock state. This allows the hardware to lock the product after the trial period expires, allowing it to be used directly on all products without the need for adaptive configuration, thus eliminating the need for additional development workload for product lock configuration each time a product is developed.

[0124] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A locking circuit for locking a product when its trial period expires, characterized in that: The locking circuit for locking the product when the trial period expires includes: a power module, an MCU module, a timing module, a switch module and an indicator light module; The power module is connected to the MCU module, the timing module and the switch module, and is used to provide power to the MCU module, the timing module and the switch module; The MCU module is connected to the timing module, the switch module, and the indicator light module, and is used to control the on and off of the switch module; The timing module is used for timing; The switch module is connected between the first circuit and the second circuit, and is used for on-off control between the first circuit and the second circuit to lock or unlock the product; The indicator light module is used to display the lock indication status of the lock circuit of the product when the trial period expires; The locking circuit for locking the product upon expiration of the trial period also includes a communication module; The communication module is connected to the power module and the MCU module, and is used to update and set the operating time of the locking circuit that is locked when the product trial period expires.

2. The locking circuit for locking a product when the trial period expires according to claim 1, characterized in that: The power module includes a power input interface PVDD, a chip U1, a chip U2 and a chip U3; The positive electrode of the power input interface PVDD is connected to the Vin interface of the chip U1, and the negative electrode is connected to the ground wire; The Vout interface of the chip U1 is connected to the Vin interface of the chip U2, and the GND interface is connected to the ground line; The Vout interface of the chip U2 is connected to the IN interface of the chip U3, and the GND interface is connected to the ground line; The EN interface of the chip U3 is connected to the Vout interface of the chip U2, and the G interface is connected to the ground line.

3. The locking circuit for locking a product when the trial period expires according to claim 2, characterized in that: The MCU module includes a chip U10, a status display interface IND, a burning interface J1, a crystal oscillator Y1, a resistor R1 and a resistor R5; The VCC interface of the chip U10 is connected to the Vout interface of the chip U2, the AVCC interface is connected to the Vout interface of the chip U2, the GND interface is connected to the ground line, the AGND interface is connected to the ground line, and the RESET interface is connected to the Vout interface of the chip U2 through the resistor R1; The first interface of the status display interface IND is connected to the ground line, and the second interface is connected to the first IO interface of the chip U10 through the resistor R5; The GND interface of the burning interface J1 is connected to the ground line, the VCC interface is connected to the Vout interface of the chip U2, the SCK interface is connected to the SCK interface of the chip U10, the nRST interface is connected to the RESET interface of the chip U10, the PDI interface is connected to the PDI interface of the chip U10, and the PDO interface is connected to the PDO interface of the chip U10; One end of the crystal oscillator Y1 is connected to the XTAL1 interface of the chip U10 , and the other end is connected to the XTAL2 of the chip U10 .

4. The locking circuit for locking a product when the trial period expires according to claim 3, characterized in that: The timing module includes a chip U12, a crystal oscillator X2 and a battery BAT1; The VCC2 interface of the chip U12 is connected to the Vout interface of the chip U2, the GND interface is connected to the ground line, the SCLK interface is connected to the CO1A interface of the chip U10, the I / O interface is connected to the CO1B interface of the chip U10, and the CE interface is connected to the CO1C interface of the chip U10; One end of the crystal oscillator X2 is connected to the X1 interface of the chip U12, and the other end is connected to the X2 interface of the chip U2; The positive electrode of the battery BAT1 is connected to the VCC1 interface of the chip U12, and the negative electrode is connected to the ground line.

5. The locking circuit for locking a product when the trial period expires according to claim 3, characterized in that: The switch module includes an input interface S3I, an output interface S3O and a chip U11; The first interface of the input interface S3I is connected to the ground line, and the second interface is connected to the 3Y1 interface of the chip U11; The first interface of the output interface S3O is connected to the ground line, and the second interface is connected to the 3Z interface of the chip U11; The VCC interface of the chip U11 is connected to the Vout interface of the chip U2, the GND interface is connected to the ground line, the 3Y0 interface is connected to the second IO interface of the chip U10, and the S3 interface is connected to the third IO interface of the chip U10.

6. The locking circuit for locking a product when the trial period expires according to claim 3, characterized in that: The indicator light module includes a light emitting diode LED1, a light emitting diode LED2, a resistor R3 and a resistor R4; The positive electrode of the light emitting diode LED1 is connected to the fourth IO interface of the chip U10, and the negative electrode is connected to the ground line through the resistor R3; The positive electrode of the light emitting diode LED2 is connected to the fifth IO interface of the chip U10, and the negative electrode is connected to the ground line through the resistor R4.

7. The locking circuit for locking a product when the trial period expires according to claim 3, characterized in that: The communication module includes a Bluetooth module BT and a light emitting diode LED3; The VCC interface of the Bluetooth module BT is connected to the OUT interface of the chip U3, the GND interface is connected to the ground wire, the RX interface is connected to the cathode of the light-emitting diode LED3, and the TX interface is connected to the RXD1 interface of the chip U10; The positive electrode of the light emitting diode LED3 is connected to the TXD1 interface of the chip U10.

8. A locking device, characterized in that: The locking device comprises a housing and a locking circuit for locking a product at the expiration of a trial period as claimed in any one of claims 1 to 7 installed in the housing; The locking circuit for locking the product upon expiration of the trial period is connected between the first circuit and the second circuit, and is used for on-off control between the first circuit and the second circuit to lock or unlock the product.

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