Electronic lock
Patent Information
- Application Number
- HK62026126244
- Authority / Receiving Office
- HK · HK
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2023-11-24
- Filing Date
- 2026-07-16
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2044-11-05
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Abstract
Description
(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202480074479.5 (22) Application Date 2024.11.06 (30) Priority Data 102023000025056 2023.11.24 IT (85) PCT International Application Entering National Phase Date 2026.05.25 (86) PCT International Application Application Data PCT / EP2024 / 081300 2024.11.06 (87) PCT International Application Publication Data WO2025 / 108706 EN 2025.05.30 (71) Applicant: Iseo Locks Ltd. Address: Italy (72) Inventor: Claudio Ricci Federico Maria Reiatoryan Misfato (74) Patent Agency: Beijing Pinyuan Patent Agency Co., Ltd. 11332 Patent Attorney: Hu Bin (51) Int.Cl. G07C 9 / 00 (2020.01) (54) Invention Title: Electronic Lock (57) Abstract: An electronic lock system comprising: a key (1) and a lock cylinder (2); a primary electronic circuit (4) mounted on the key (1) and including a primary microcontroller (A). The device includes a power generator (8); a secondary electronic circuit (5) mounted on the lock cylinder (2) and including a secondary microcontroller (B); and a switching power supply for periodic power transfer from the key (1) to the lock cylinder (2), wherein the switching power supply includes a primary coil (L1) inserted into the primary electronic circuit (4), a secondary coil (L2) inserted into the secondary electronic circuit (5), and a first electronic switch (M2) inserted into the primary electronic circuit (4), the first electronic switch being able to switch between an enabled state and an disabled state of current passing through the primary coil (L1), the primary microcontroller (A) being configured to generate a switching frequency by a clock signal to determine the start of each power transfer cycle, the purpose of which is to achieve the maximum current intensity passing through the primary coil (L1), and being configured to synchronously transmit a serial signal at the switching frequency or a divisor of the switching frequency, the serial signal being selected to be the maximum current intensity passing through the primary coil (L1) in each power transfer cycle for encoding data transmitted from the primary microcontroller (A) to the secondary microcontroller (B).Claims 2 pages, Description 5 pages, Drawings 3 pages, CN 122249842 A 2026.06.19 CN 1 22 24 98 42 A 1. An electronic lock system comprising: a key (1); a lock cylinder (2) having a slot (3) for inserting the key (1); a primary electronic circuit (4) mounted on the key (1) and including a primary microcontroller (A) and a power generator (8); a secondary electronic circuit (5) mounted on the lock cylinder (2) and including a secondary microcontroller (B); and a switching power supply for periodically transmitting electrical energy from the key (1) to the lock cylinder (2), wherein the switching power supply includes a primary coil (L1) inserted into the primary electronic circuit (4), and a secondary electronic circuit (5) inserted into the secondary electronic circuit (5) when the key (1) is inserted into the slot (3). The electronic lock system is characterized by an inductively coupled secondary coil (L2) to the primary coil (L1) and a first electronic switch (M2) inserted into the primary electronic circuit (4) and capable of switching between a state where current flows through the primary coil (L1) is enabled and a state where current flows through the primary coil is disabled. The primary microcontroller (A) is configured to generate a switching frequency via a clock signal that defines the start time of each power transfer cycle, each power transfer cycle including a maximum value of the current intensity flowing through the primary coil (L1), and is configured to synchronously transmit a serial signal at the switching frequency or a divisor of the switching frequency, the serial signal being used to select the maximum value of the current intensity flowing through the primary coil (L1) in each power transfer cycle for encoding data transmitted from the primary microcontroller (A) to the secondary microcontroller (B). 2. The electronic lock system according to the preceding claim, characterized in that the first electronic switch (M2) is formed of a first MOSFET. 3. The electronic lock system according to any of the preceding claims, characterized in that the secondary electronic circuit (5) includes a first means for analyzing the signal at the end of the secondary coil (L2), the first means being configured to reconstruct the maximum value (IL1a, IL1b) of the intensity of the current (IL1) passing through the primary coil (L1) in each energy transfer cycle when the first electronic switch (M2) is in the enabled state. 4. The electronic lock system according to the preceding claim, characterized in that the first analysis means includes a comparator (U4) connected to the secondary microcontroller (B).5. The electronic lock system according to any of the preceding claims, characterized in that the secondary electronic circuit (5) includes a component (C1) for modifying the resonant frequency of the inductively coupled circuit formed by the primary electronic circuit (4) and the secondary electronic circuit (5), and a second electronic switch (M1) configured to include or exclude the component (C1) for modifying the resonant frequency. 6. The electronic lock system according to the preceding claim, characterized in that the second microcontroller (B) is configured to transmit a serial signal for switching the second electronic switch (M1). 7. The electronic lock system according to any one of claims 5 and 6, characterized in that the component (C1) for modifying the resonant frequency is a capacitor. 8. The electronic lock system according to any one of claims 5 to 7, characterized in that the second electronic switch (M1) is formed by a second MOSFET. 9. The electronic lock system according to any one of claims 5 to 8, characterized in that the primary microcontroller (A) includes a second means for analyzing the signal at the end of the primary coil (L1), the second means being configured to identify the resonant frequency when the first electronic switch (M2) is in the disabled state. 10. The electronic lock system according to the preceding claim, characterized in that the second analysis device includes a comparator (U2) connected to the primary microcontroller (A). 11. The electronic lock system according to any of the preceding claims, characterized in that the secondary electronic circuit (5) includes a third device for analyzing the signal at the end of the secondary coil (L2), the third device being configured to reconstruct a clock synchronization signal when the first electronic switch (M2) is in the enabled state. 12. The electronic lock system according to the preceding claim, characterized in that the third analysis device includes a comparator (U3) connected to the secondary microcontroller (B). 13. The electronic lock system according to any one of claims 9 to 12, characterized in that the secondary electronic circuit (5) includes a capacitor (C5) for accumulating the electrical energy supplied by the secondary coil (L2), and the second microcontroller (B) is configured to acquire and analyze the voltage across the accumulation capacitor (C5), and is configured to synchronously transmit a switching signal of the second electronic switch (M1) at a reconstructed clock frequency whenever the voltage across the accumulation capacitor (C5) reaches a threshold. 14. The electronic lock system according to any preceding claim, characterized in that the switching power supply is flyback type.Claims 2 / 2 Page 3 CN 122249842 A Electronic Lock
[0001] Description
[0002] The present invention relates to an electronic lock comprising a key and a lock cylinder equipped with a slot for inserting a key, and a method for bidirectional data transfer between the key and the lock cylinder when the key is inserted into the slot of the lock cylinder.
[0003] Electronic locks are known in which the key is characterized by a primary electronic circuit comprising a primary microcontroller and an independent power supply (typically a battery), and the lock cylinder comprises a secondary electronic circuit comprising a secondary microcontroller and a power storage device (typically a capacitor).
[0004] In such electronic locks, a system for transferring electrical energy from a battery to a capacitor is typically provided. This system typically consists of a switching power supply that facilitates energy transfer through inductive coupling, which occurs between a primary coil in the primary electronic circuit and a secondary coil in the secondary electronic circuit when the key is inserted into the lock cylinder slot.
[0005] Furthermore, in such electronic locks, data exchange between the key and the lock cylinder typically occurs with a loosely magnetically coupled transponder, transmitting data to the lock cylinder by amplitude modulation (typically 100%) of the alternating magnetic field generated by the key, and asynchronously transmitting data from the lock cylinder to the key by changing the q-factor (quality factor) of the circuit (typically by short-circuiting the secondary coil).
[0006] The advantages of this system include circuit simplicity and low sensitivity to the coupling coefficient between the primary and secondary coils.
[0007] The disadvantages are low communication speed, due to the need to integrate the carrier signal to significantly separate the modulated frequency from the carrier frequency (typically by at least one order of magnitude), and for transmission, the power transmitted from the key to the lock cylinder needs to be reduced by an average of 50% when transmitted from the key to the lock cylinder and by 75% when transmitted from the lock cylinder to the key.
[0008] Therefore, the technical objective of the present invention is to create an electronic lock of the aforementioned type that eliminates the technical defects observed in the known art.
[0009] As part of this technical task, one object of the present invention is to create an electronic lock of the aforementioned type that can transmit in both directions at higher speeds and with less power reduction.
[0010] According to the present invention, this technical task and these and other objectives are achieved by providing an electronic lock system comprising: a key; a lock cylinder having a slot for inserting the key; a primary electronic circuit mounted on the key and including a primary microcontroller and a generator; a secondary electronic circuit mounted on the lock cylinder and including a secondary microcontroller; and a switching power supply for periodic power transfer from the key to the lock cylinder, wherein the switching power supply includes a primary coil inserted into the primary electronic circuit, a secondary coil inserted into the secondary electronic circuit and inductively coupled to the primary coil when the key is inserted into the slot, and the primary electronic circuit. A first electronic switch in the primary coil, which is capable of switching between an enabled state and a disabled state to allow or prevent current from flowing through the primary coil, is characterized in that the primary microcontroller is configured to generate a switching frequency defining the start time of each power transfer cycle via a clock signal, each power transfer cycle including achieving a maximum value of the current intensity through the primary coil, and is configured to synchronously transmit a serial signal at the switching frequency or a divisor of the switching frequency, the serial signal being used to select the maximum value of the current intensity through the primary coil in each power transfer cycle for encoding data transmitted from the primary microcontroller to the secondary microcontroller. Specification 1 / 5 pages 4 CN 122249842 A
[0011] In a preferred embodiment of the invention, the secondary electronic circuitry includes first signal analysis devices at the terminals of the secondary coil, these first analysis devices being configured to reconstruct the maximum current value through the primary coil during each power transfer cycle when the first electronic switch is enabled.
[0012] In a preferred embodiment of the invention, the secondary electronic circuit includes components for modifying the resonant frequency of an inductively coupled circuit formed by the primary and secondary electronic circuits, and a second electronic switch configured to include or exclude the resonant frequency modification components.
[0013] In a preferred embodiment of the invention, the secondary microcontroller is configured to transmit a serial switching signal to the second electronic switch.
[0014] In another preferred embodiment of the invention, the primary microcontroller includes a second signal analysis device at a terminal of the primary coil, the second analysis device being configured to identify the resonant frequency when the first electronic switch is disabled.
[0015] In a preferred embodiment of the invention, the secondary electronic circuit includes a third signal analysis device at a terminal of the secondary coil, the third analysis device being configured to reconstruct a clock synchronization signal when the first electronic switch is enabled.
[0016] In a preferred embodiment of the invention, the secondary electronic circuit includes a storage capacitor for electrical energy supplied by the secondary coil, and the secondary microcontroller is configured to acquire and analyze the voltage across the storage capacitor, and is configured to synchronously transmit a switching signal for the second electronic switch at a reconstructed clock frequency whenever the voltage across the storage capacitor reaches a threshold.
[0017] In a preferred embodiment of the invention, the switching power supply is flyback.
[0018] In the electronic lock, power transmission is performed using an inductively coupled primary and secondary coil.
[0019] Data exchange can be performed synchronously or asynchronously, wherein the first method is preferred when speed is a critical factor.
[0020] In the case of synchronous data exchange, when the first electronic switch is enabled, a synchronization signal (meaning a clock signal generated by the primary microcontroller) is reconstructed on the lock core side from the ineffective portion of the voltage.
[0021] The synchronization signal defines the moment when the signal across the primary coil contains information transmitted from the primary electronic circuit, wherein the signal level changes to indicate a transmission as "one" or "zero" due to a change in the maximum current intensity flowing through the primary coil.
[0022] The synchronization signal reconstructed by the secondary microcontroller defines the timing at which the secondary electronic circuitry is modified by the resonant frequency modification component, such that when the first electronic switch is disabled, the second analysis device can determine whether the resonant frequency modification component is inserted.
[0023] Other features of the invention are further defined in the following claims.
[0024] Other features and advantages of the invention will become more apparent from the description of a preferred but not exclusive embodiment of the electronic lock, which is presented in the accompanying drawings for illustrative rather than limiting purposes, wherein:
[0025] FIG1 schematically shows the key and lock cylinder of the electronic lock;
[0026] FIG2 shows a circuit diagram of the electronic lock;
[0027] FIG3 schematically shows a data transmission method from the key to the lock cylinder.
[0028] Referring to the referenced drawings, the electronic lock includes a key 1 and a lock cylinder 2, the lock cylinder being equipped with a slot 3 for inserting the key 1.
[0029] The electronic lock also includes: a primary electronic circuit 4, which is mounted on the key 1; a secondary electronic circuit 5, which is mounted on the lock cylinder 2; and a switching power supply for periodic power transmission from the key 1 to the lock cylinder 2.
[0030] The primary electronic circuit 4 includes a primary microcontroller A, and similarly, the secondary electronic circuit 5 includes a secondary microcontroller B.
[0031] The switching power supply includes a primary coil L1 inserted into the primary electronic circuit 4, and a secondary coil L2 inserted into the secondary electronic circuit 5 and inductively coupled to the primary coil L1 when the key 1 is inserted into the slot 3 of the lock cylinder 2.
[0032] The switching power supply also includes an electronic switch M2 inserted into the primary electronic circuit 4, which is capable of switching between an enabled state and a disabled state when current flows through the primary coil L1.
[0033] The primary coil L1 may be incorporated into the blade of the key 1, and the secondary coil L2 may be incorporated into the rotor of the lock cylinder 2 adjacent to the slot 3, such that when the key 1 is inserted into the slot 3, the primary coil L1 and the secondary coil L2 are aligned with parallel or nearly parallel axes.
[0034] The primary microcontroller A is programmed to perform periodic energy transfer from an independent power source 8 (typically a battery) located in the primary electronic circuit 4 to an energy storage device (typically a capacitor C5) located in the secondary electronic circuit 5.
[0035] Battery 8 supplies power to all active components of primary electronic circuit 4 (including primary microcontroller A) via input port VCCA.
[0036] Primary microcontroller A has a digital serial output port (labeled "clock output A") through which it transmits a clock signal. The switching frequency determines the start of each power transfer cycle, which involves achieving the maximum values IL1a and IL1b of the current IL1 flowing through primary coil L1.
[0037] The start of each power transfer cycle corresponds to the moment when current begins to flow through primary coil L1.
[0038] Primary microcontroller A also transmits a signal synchronously from the digital serial output port (labeled "serial output A") at the switching frequency or a divisor of that switching frequency, thereby selecting the maximum current value IL1a or IL1b of the current IL1 flowing through primary coil L1 during each power transfer cycle to encode the data transmitted from primary microcontroller A to secondary microcontroller B.
[0039] In practice, during data transmission from the key to the lock cylinder, for each energy transmission cycle or group of cycles, the primary microcontroller A selects the maximum current intensity IL1 between two different current values IL1a and IL1b at a time interval t1 defined by a clock signal.
[0040] Selecting the lower value IL1b corresponds to transmission "zero," while selecting the higher value IL1a corresponds to transmission "one."
[0041] The switching power supply may be a flyback type.
[0042] In this case, the flyback includes a trigger A1 and a voltage comparator U1, and the electronic switch M2 is formed by a MOSFET controlled by the trigger A1.
[0043] Voltage comparator U1 compares the voltage across resistor R14 through which the current flowing through the primary coil L1 passes with a reference voltage, so that when the voltage across resistor R14 exceeds the reference voltage, MOSFET M2 is switched from the on state to the off state.
[0044] The energy transfer cycle proceeds as follows.
[0045] Primary microcontroller A sends a clock signal to set trigger A1.
[0046] When set, trigger A1 sends a signal from its Q output that switches MOSFET M2 from the off state to the on state.
[0047] Current supplied by battery 8 flows sequentially through primary coil L1, MOSFET M2, and resistor R14.
[0048] Resistor R14 has one terminal grounded and another terminal connected to the inverting input of voltage comparator U1, while its non-inverting input is maintained at the maximum reference voltage, which is determined by the voltage present at the analog output port (labeled "Analog Output A") of the primary microcontroller A (page 3 / 5 of the specification, CN 122249842 A) and regulated by a voltage divider consisting of resistors R15, R16, R17 and capacitor filter C8.
[0049] As the current flowing through coil L1 gradually increases, the voltage across resistor R14 increases proportionally.
[0050] When the voltage at the inverting input of comparator U1 exceeds the maximum reference voltage at the non-inverting input of comparator U1, comparator U1 resets flip-flop A1 by sending a signal to the CLR input of flip-flop A1.
[0051] As a result of the reset, trigger A1 not only sends a signal from its Q output to switch MOSFET M2 from the ON state to the OFF state, but also sends a signal from its Q output detected by the primary microcontroller A via the digital serial input port (labeled "Digital Input A").
[0052] When MOSFET M2 switches from the ON state to the OFF state, the current flow through the primary coil L1 stops, and current begins to flow through the secondary coil L2.
[0053] The current flowing through the secondary coil L2 charges the capacitor C5 via the diode D6.
[0054] Essentially, when MOSFET M2 is in the ON state, energy is stored in the magnetic field formed by the primary coil L1 and the secondary coil L2, and once MOSFET M2 switches from the ON state to the OFF state, the energy stored in the magnetic field is transferred to the capacitor C5, and subsequently to the load R6.
[0055] The secondary electronic circuit 5 includes a first signal analysis device at the terminals of the secondary coil L2.
[0056] These first analysis devices are configured to reconstruct the maximum value of the current IL1 through the primary coil L1, IL1a or IL1b, during each energy transfer cycle when the first electronic switch M2 is enabled.
[0057] The first analysis device includes a comparator U4 connected to the secondary microcontroller B, specifically a voltage comparator.
[0058] The comparator U4 captures the peak voltage across the secondary coil L2 and compares the peak voltage with a reference voltage.
[0059] If the captured peak voltage exceeds the reference voltage, the comparator U4 sends a "-" signal to the digital serial input port (labeled "Serial Input B") of the secondary microcontroller B, the "-" signal indicating the maximum current value IL1a reached in the primary coil L1; conversely, if the captured peak voltage is lower than the reference voltage, the comparator U4 sends a "zero" signal to the digital serial input port (labeled "Serial Input B") of the secondary microcontroller B, the "zero" signal indicating the minimum current value IL1b reached in the primary coil L1.
[0060] Specifically, resistors R20 and R21 form a voltage divider that regulates the input voltage to the operating voltage of comparator U3, which extracts a clock signal and sends it to microcontroller B via the "clock input B" port.
[0061] Resistors R22 and R23 form a voltage divider that regulates the input voltage to the operating voltage of comparator U4, which extracts a data signal and sends it to microcontroller B via the "serial input B" port.
[0062] The secondary electronic circuit 5 also includes a component C1 for modifying the resonant frequency of the inductively coupled circuit formed by the primary electronic circuit 4 and the secondary electronic circuit 5, and a second electronic switch M1 configured to include or exclude the component C1 for modifying the resonant frequency.
[0063] The second electronic switch M1 is composed of a second MOSFET. The secondary microcontroller B is configured to transmit a switching signal for the second electronic switch M1 via a digital serial output port (labeled "serial output B").
[0064] The component C1 for modifying the resonant frequency consists of a capacitor placed in parallel with the secondary coil L2.
[0065] The primary microcontroller A includes a second signal analysis device at the terminals of the primary coil L1.
[0066] This second analysis device is configured to detect the resonant frequency when the first electronic switch M2 is disabled. The second analysis device includes a comparator U2, specifically a voltage comparator, connected to the primary microcontroller A via a digital serial input port (labeled "Serial Input A").
[0067] The secondary electronic circuit 5 also includes a third signal analysis device at the terminals of the secondary coil L2.
[0068] This third analysis device is configured to reconstruct the clock synchronization signal when the first electronic switch M2 is enabled.
[0069] The third analysis device includes a comparator U3, specifically a voltage comparator, connected to the secondary microcontroller B.
[0070] Comparator U3 detects the zero-crossing of the voltage at the terminals of the secondary coil L2 and sends the data to the digital serial input port (labeled "Clock Input B") of the secondary microcontroller B, allowing the secondary microcontroller B to reconstruct the clock signal generated by the primary microcontroller A.
[0071] Specifically, resistors R20 and R21 form a voltage divider that regulates the input voltage to the operating voltage of comparator U3, which extracts the clock signal and sends it to the microcontroller B via the "Clock Input B" port.
[0072] The secondary microcontroller B is configured to acquire and analyze the voltage at the terminals of the storage capacitor C5, and whenever the voltage at the terminals of the storage capacitor C5 reaches a threshold voltage, transmits a switching signal for the second switch M1 synchronously at the reconstructed clock frequency via the digital serial output port (labeled "Serial Output B"), the threshold voltage being read by the secondary microcontroller B through the analog input port (labeled "Analog Input B").
[0073] Specifically, whenever the voltage at the terminal of storage capacitor C5 reaches a threshold voltage, the secondary microcontroller B engages capacitor C1.
[0074] In practice, a switching signal changes the state of MOSFET M1, which in turn excludes or includes capacitor C1 connected in parallel with secondary coil L2.
[0075] When included, capacitor C1 changes the resonant frequency of the inductively coupled circuit through coils L1 and L2, and this, in turn, affects the signal at the terminal of primary coil L1 when MOSFET M2 is disabled, because when enabled, the voltage supplied by battery 8 is present across primary coil L1.
[0076] Therefore, when MOSFET M2 is disabled, the voltage across resistor R19, which is connected in series with primary coil L1 and upstream of diode D4, is recorded. The average value of this voltage, obtained through capacitor C7, is taken at the midpoint of the voltage divider formed by resistors R11 and R12 and is transmitted to one input of comparator U2. The instantaneous value of this voltage, obtained through resistor R13, which is located upstream of diode D4 and connected in series with resistor R19, is transmitted to the other input.
[0077] When capacitor C1 is engaged, the voltage oscillates at a lower frequency, and therefore the amplitude of the oscillation is reduced.
[0078] Comparator U2 determines whether the instantaneous value of the voltage is greater than or less than its average value, one case corresponding to excluding capacitor C1 and the other case corresponding to including the capacitor.
[0079] Comparator U2 then transmits this information to primary microcontroller A via the digital serial input port "Serial Input A".
[0080] In detail, resistors R9 and R10 and capacitor C6 form a low-pass filter that eliminates high-frequency and unwanted components of the signal. This filter can also be implemented in other ways, such as through DSP circuitry.
[0081] Therefore, the electronic lock is capable of efficient and effective bidirectional data exchange between the key and the lock cylinder.
[0082] As envisioned, the electronic lock can be modified and varied in many ways, all of which are within the scope of the inventive concept; furthermore, all details can be replaced by technically equivalent elements.
[0083] In practice, the materials and dimensions used can vary according to needs and current technology. (See attached figures: 5 / 5 pages, CN 122249842 A, Figure 1; 1 / 3 pages, CN 122249842 A, Figure 2; 2 / 3 pages, CN 122249842 A, Figure 3; 3 / 3 pages, CN 122249842 A)
Claims
1. An electronic lock system, the electronic lock system comprising: Key (1); A lock cylinder (2) having a slot (3) for inserting the key (1); a primary electronic circuit (4) mounted on the key (1) and including a primary microcontroller (A) and a power generator (8); a secondary electronic circuit (5) mounted on the lock cylinder (2) and including a secondary microcontroller (B); and a switching power supply for periodically transmitting electrical energy from the key (1) to the lock cylinder (2), wherein the switching power supply includes a primary coil (L1) inserted into the primary electronic circuit (4), a secondary coil (L2) inserted into the secondary electronic circuit (5) and inductively coupled to the primary coil (L1) when the key (1) is inserted into the slot (3), and a secondary coil (L2) inserted into the primary electronic circuit (4). 4) A first electronic switch (M2) capable of switching between a state where current is enabled through the primary coil (L1) and a state where current is disabled through the primary coil, characterized in that the primary microcontroller (A) is configured to generate a switching frequency by means of a clock signal defining the start time of each power transfer cycle, each power transfer cycle including realizing a maximum value of the intensity of the current through the primary coil (L1), and is configured to synchronously transmit a serial signal at the switching frequency or a divisor of the switching frequency, the serial signal being used to select the maximum value of the intensity of the current through the primary coil (L1) in each power transfer cycle for encoding data transmitted from the primary microcontroller (A) to the secondary microcontroller (B).
2. The electronic lock system according to the preceding claims, characterized in that... The first electronic switch (M2) is formed by the first MOSFET.
3. The electronic lock system according to any of the preceding claims, characterized in that... The secondary electronic circuit (5) includes a first means for analyzing the signal at the end of the secondary coil (L2), the first means being configured to reconstruct the current (I) passing through the primary coil (L1) in each energy transfer cycle when the first electronic switch (M2) is in the enabled state. L1 The maximum value of the intensity of ) (I) L1a , I L1b ).
4. The electronic lock system according to the preceding claim, characterized in that... The first analysis device includes a comparator (U4) connected to the secondary microcontroller (B).
5. The electronic lock system according to any of the preceding claims, characterized in that... The secondary electronic circuit (5) includes a component (C1) for modifying the resonant frequency of the inductively coupled circuit formed by the primary electronic circuit (4) and the secondary electronic circuit (5), and a second electronic switch (M1) configured to include or exclude the component (C1) for modifying the resonant frequency.
6. The electronic lock system according to the preceding claim, characterized in that... The second microcontroller (B) is configured to transmit a serial signal for switching the second electronic switch (M1).
7. The electronic lock system according to any one of claims 5 and 6, characterized in that... The component (C1) used to modify the resonant frequency is a capacitor.
8. The electronic lock system according to any one of claims 5 to 7, characterized in that... The second electronic switch (M1) is formed by the second MOSFET.
9. The electronic lock system according to any one of claims 5 to 8, characterized in that... The primary microcontroller (A) includes a second means for analyzing the signal at the end of the primary coil (L1), the second means being configured to identify the resonant frequency when the first electronic switch (M2) is in the disabled state.
10. The electronic lock system according to the preceding claim, characterized in that... The second analysis device includes a comparator (U2) connected to the primary microcontroller (A).
11. The electronic lock system according to any of the preceding claims, characterized in that... The secondary electronic circuit (5) includes a third means for analyzing the signal at the end of the secondary coil (L2), the third means being configured to reconstruct the clock synchronization signal when the first electronic switch (M2) is in the enabled state.
12. The electronic lock system according to the preceding claim, characterized in that... The third analysis device includes a comparator (U3) connected to the secondary microcontroller (B).
13. The electronic lock system according to any one of claims 9 to 12, characterized in that... The secondary electronic circuit (5) includes a capacitor (C5) for accumulating the electrical energy supplied by the secondary coil (L2), and the second microcontroller (B) is configured to acquire and analyze the voltage across the accumulation capacitor (C5), and is configured to synchronously transmit the switching signal of the second electronic switch (M1) at a reconstructed clock frequency whenever the voltage across the accumulation capacitor (C5) reaches a threshold.
14. The electronic lock system according to any of the preceding claims, characterized in that... The switching power supply is a flyback type.